4595 lines
115 KiB
C
4595 lines
115 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1999 Poul-Henning Kamp.
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* Copyright (c) 2008 Bjoern A. Zeeb.
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* Copyright (c) 2009 James Gritton.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/sysproto.h>
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#include <sys/malloc.h>
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#include <sys/osd.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/taskqueue.h>
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#include <sys/fcntl.h>
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#include <sys/jail.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/racct.h>
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#include <sys/rctl.h>
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#include <sys/refcount.h>
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#include <sys/sx.h>
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#include <sys/sysent.h>
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#include <sys/namei.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/uuid.h>
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#include <sys/vnode.h>
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#include <net/if.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif /* DDB */
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#include <security/mac/mac_framework.h>
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#define PRISON0_HOSTUUID_MODULE "hostuuid"
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MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
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static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
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/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
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#ifdef INET
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#ifdef INET6
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#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
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#else
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#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
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#endif
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#else /* !INET */
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#ifdef INET6
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#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
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#else
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#define _PR_IP_SADDRSEL 0
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#endif
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#endif
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/* prison0 describes what is "real" about the system. */
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struct prison prison0 = {
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.pr_id = 0,
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.pr_name = "0",
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.pr_ref = 1,
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.pr_uref = 1,
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.pr_path = "/",
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.pr_securelevel = -1,
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.pr_devfs_rsnum = 0,
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.pr_state = PRISON_STATE_ALIVE,
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.pr_childmax = JAIL_MAX,
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.pr_hostuuid = DEFAULT_HOSTUUID,
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.pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
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#ifdef VIMAGE
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.pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
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#else
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.pr_flags = PR_HOST|_PR_IP_SADDRSEL,
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#endif
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.pr_allow = PR_ALLOW_ALL_STATIC,
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};
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MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
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struct bool_flags {
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const char *name;
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const char *noname;
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volatile u_int flag;
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};
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struct jailsys_flags {
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const char *name;
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unsigned disable;
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unsigned new;
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};
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/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
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struct sx allprison_lock;
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SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
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struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
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LIST_HEAD(, prison_racct) allprison_racct;
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int lastprid = 0;
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static int get_next_prid(struct prison **insprp);
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static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
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static void prison_complete(void *context, int pending);
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static void prison_deref(struct prison *pr, int flags);
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static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
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static int prison_lock_xlock(struct prison *pr, int flags);
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static void prison_free_not_last(struct prison *pr);
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static void prison_proc_free_not_last(struct prison *pr);
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static void prison_set_allow_locked(struct prison *pr, unsigned flag,
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int enable);
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static char *prison_path(struct prison *pr1, struct prison *pr2);
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#ifdef RACCT
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static void prison_racct_attach(struct prison *pr);
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static void prison_racct_modify(struct prison *pr);
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static void prison_racct_detach(struct prison *pr);
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#endif
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/* Flags for prison_deref */
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#define PD_DEREF 0x01 /* Decrement pr_ref */
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#define PD_DEUREF 0x02 /* Decrement pr_uref */
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#define PD_KILL 0x04 /* Remove jail, kill processes, etc */
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#define PD_LOCKED 0x10 /* pr_mtx is held */
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#define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
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#define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
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#define PD_OP_FLAGS 0x07 /* Operation flags */
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#define PD_LOCK_FLAGS 0x70 /* Lock status flags */
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/*
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* Parameter names corresponding to PR_* flag values. Size values are for kvm
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* as we cannot figure out the size of a sparse array, or an array without a
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* terminating entry.
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*/
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static struct bool_flags pr_flag_bool[] = {
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{"persist", "nopersist", PR_PERSIST},
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#ifdef INET
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{"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
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#endif
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#ifdef INET6
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{"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
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#endif
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};
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const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
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static struct jailsys_flags pr_flag_jailsys[] = {
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{"host", 0, PR_HOST},
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#ifdef VIMAGE
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{"vnet", 0, PR_VNET},
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#endif
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#ifdef INET
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{"ip4", PR_IP4_USER, PR_IP4_USER},
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#endif
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#ifdef INET6
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{"ip6", PR_IP6_USER, PR_IP6_USER},
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#endif
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};
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const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
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/*
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* Make this array full-size so dynamic parameters can be added.
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* It is protected by prison0.mtx, but lockless reading is allowed
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* with an atomic check of the flag values.
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*/
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static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
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{"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
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{"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
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{"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
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{"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
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{"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
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{"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
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{"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
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{"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
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{"allow.reserved_ports", "allow.noreserved_ports",
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PR_ALLOW_RESERVED_PORTS},
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{"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
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{"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
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PR_ALLOW_UNPRIV_DEBUG},
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{"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
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};
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static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
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const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
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#define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
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PR_ALLOW_RESERVED_PORTS | \
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PR_ALLOW_UNPRIV_DEBUG | \
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PR_ALLOW_SUSER)
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#define JAIL_DEFAULT_ENFORCE_STATFS 2
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#define JAIL_DEFAULT_DEVFS_RSNUM 0
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static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
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static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
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static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
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#if defined(INET) || defined(INET6)
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static unsigned jail_max_af_ips = 255;
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#endif
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/*
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* Initialize the parts of prison0 that can't be static-initialized with
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* constants. This is called from proc0_init() after creating thread0 cpuset.
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*/
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void
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prison0_init(void)
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{
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uint8_t *file, *data;
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size_t size;
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prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
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prison0.pr_osreldate = osreldate;
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strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
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/* If we have a preloaded hostuuid, use it. */
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file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
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if (file != NULL) {
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data = preload_fetch_addr(file);
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size = preload_fetch_size(file);
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if (data != NULL) {
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/*
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* The preloaded data may include trailing whitespace, almost
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* certainly a newline; skip over any whitespace or
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* non-printable characters to be safe.
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*/
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while (size > 0 && data[size - 1] <= 0x20) {
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size--;
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}
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if (validate_uuid(data, size, NULL, 0) == 0) {
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(void)strlcpy(prison0.pr_hostuuid, data,
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size + 1);
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} else if (bootverbose) {
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printf("hostuuid: preload data malformed: '%.*s'\n",
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(int)size, data);
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}
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}
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}
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if (bootverbose)
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printf("hostuuid: using %s\n", prison0.pr_hostuuid);
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}
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/*
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* struct jail_args {
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* struct jail *jail;
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* };
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*/
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int
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sys_jail(struct thread *td, struct jail_args *uap)
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{
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uint32_t version;
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int error;
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struct jail j;
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error = copyin(uap->jail, &version, sizeof(uint32_t));
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if (error)
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return (error);
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switch (version) {
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case 0:
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{
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struct jail_v0 j0;
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/* FreeBSD single IPv4 jails. */
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bzero(&j, sizeof(struct jail));
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error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
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if (error)
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return (error);
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j.version = j0.version;
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j.path = j0.path;
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j.hostname = j0.hostname;
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j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
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break;
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}
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case 1:
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/*
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* Version 1 was used by multi-IPv4 jail implementations
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* that never made it into the official kernel.
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*/
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return (EINVAL);
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case 2: /* JAIL_API_VERSION */
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/* FreeBSD multi-IPv4/IPv6,noIP jails. */
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error = copyin(uap->jail, &j, sizeof(struct jail));
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if (error)
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return (error);
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break;
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default:
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/* Sci-Fi jails are not supported, sorry. */
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return (EINVAL);
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}
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return (kern_jail(td, &j));
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}
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int
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kern_jail(struct thread *td, struct jail *j)
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{
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struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
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#ifdef INET
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+ 1
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#endif
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#ifdef INET6
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+ 1
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#endif
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)];
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struct uio opt;
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char *u_path, *u_hostname, *u_name;
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struct bool_flags *bf;
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#ifdef INET
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uint32_t ip4s;
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struct in_addr *u_ip4;
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#endif
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#ifdef INET6
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struct in6_addr *u_ip6;
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#endif
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size_t tmplen;
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int error, enforce_statfs;
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bzero(&optiov, sizeof(optiov));
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opt.uio_iov = optiov;
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opt.uio_iovcnt = 0;
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opt.uio_offset = -1;
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opt.uio_resid = -1;
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opt.uio_segflg = UIO_SYSSPACE;
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opt.uio_rw = UIO_READ;
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opt.uio_td = td;
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/* Set permissions for top-level jails from sysctls. */
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if (!jailed(td->td_ucred)) {
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for (bf = pr_flag_allow;
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bf < pr_flag_allow + nitems(pr_flag_allow) &&
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atomic_load_int(&bf->flag) != 0;
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bf++) {
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optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
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(jail_default_allow & bf->flag)
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? bf->name : bf->noname);
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optiov[opt.uio_iovcnt].iov_len =
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strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
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opt.uio_iovcnt += 2;
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}
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optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
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optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
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opt.uio_iovcnt++;
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enforce_statfs = jail_default_enforce_statfs;
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optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
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optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
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opt.uio_iovcnt++;
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}
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tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
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#ifdef INET
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ip4s = (j->version == 0) ? 1 : j->ip4s;
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if (ip4s > jail_max_af_ips)
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return (EINVAL);
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tmplen += ip4s * sizeof(struct in_addr);
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#else
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if (j->ip4s > 0)
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return (EINVAL);
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#endif
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#ifdef INET6
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if (j->ip6s > jail_max_af_ips)
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return (EINVAL);
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tmplen += j->ip6s * sizeof(struct in6_addr);
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#else
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if (j->ip6s > 0)
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return (EINVAL);
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#endif
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u_path = malloc(tmplen, M_TEMP, M_WAITOK);
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u_hostname = u_path + MAXPATHLEN;
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u_name = u_hostname + MAXHOSTNAMELEN;
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#ifdef INET
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u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
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#endif
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#ifdef INET6
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#ifdef INET
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u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
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#else
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u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
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#endif
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#endif
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optiov[opt.uio_iovcnt].iov_base = "path";
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optiov[opt.uio_iovcnt].iov_len = sizeof("path");
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opt.uio_iovcnt++;
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optiov[opt.uio_iovcnt].iov_base = u_path;
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error = copyinstr(j->path, u_path, MAXPATHLEN,
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&optiov[opt.uio_iovcnt].iov_len);
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if (error) {
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free(u_path, M_TEMP);
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return (error);
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}
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opt.uio_iovcnt++;
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optiov[opt.uio_iovcnt].iov_base = "host.hostname";
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optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
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opt.uio_iovcnt++;
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optiov[opt.uio_iovcnt].iov_base = u_hostname;
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error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
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&optiov[opt.uio_iovcnt].iov_len);
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if (error) {
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free(u_path, M_TEMP);
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return (error);
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}
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opt.uio_iovcnt++;
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if (j->jailname != NULL) {
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optiov[opt.uio_iovcnt].iov_base = "name";
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optiov[opt.uio_iovcnt].iov_len = sizeof("name");
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opt.uio_iovcnt++;
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optiov[opt.uio_iovcnt].iov_base = u_name;
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error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
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&optiov[opt.uio_iovcnt].iov_len);
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if (error) {
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free(u_path, M_TEMP);
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return (error);
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}
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opt.uio_iovcnt++;
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}
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#ifdef INET
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optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
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optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
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opt.uio_iovcnt++;
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optiov[opt.uio_iovcnt].iov_base = u_ip4;
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optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
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if (j->version == 0)
|
|
u_ip4->s_addr = j->ip4s;
|
|
else {
|
|
error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
|
|
if (error) {
|
|
free(u_path, M_TEMP);
|
|
return (error);
|
|
}
|
|
}
|
|
opt.uio_iovcnt++;
|
|
#endif
|
|
#ifdef INET6
|
|
optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
|
|
optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
|
|
opt.uio_iovcnt++;
|
|
optiov[opt.uio_iovcnt].iov_base = u_ip6;
|
|
optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
|
|
error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
|
|
if (error) {
|
|
free(u_path, M_TEMP);
|
|
return (error);
|
|
}
|
|
opt.uio_iovcnt++;
|
|
#endif
|
|
KASSERT(opt.uio_iovcnt <= nitems(optiov),
|
|
("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
|
|
error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
|
|
free(u_path, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* struct jail_set_args {
|
|
* struct iovec *iovp;
|
|
* unsigned int iovcnt;
|
|
* int flags;
|
|
* };
|
|
*/
|
|
int
|
|
sys_jail_set(struct thread *td, struct jail_set_args *uap)
|
|
{
|
|
struct uio *auio;
|
|
int error;
|
|
|
|
/* Check that we have an even number of iovecs. */
|
|
if (uap->iovcnt & 1)
|
|
return (EINVAL);
|
|
|
|
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
|
|
if (error)
|
|
return (error);
|
|
error = kern_jail_set(td, auio, uap->flags);
|
|
free(auio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_jail_set(struct thread *td, struct uio *optuio, int flags)
|
|
{
|
|
struct nameidata nd;
|
|
#ifdef INET
|
|
struct in_addr *ip4;
|
|
#endif
|
|
#ifdef INET6
|
|
struct in6_addr *ip6;
|
|
#endif
|
|
struct vfsopt *opt;
|
|
struct vfsoptlist *opts;
|
|
struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr;
|
|
struct vnode *root;
|
|
char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
|
|
char *g_path, *osrelstr;
|
|
struct bool_flags *bf;
|
|
struct jailsys_flags *jsf;
|
|
#if defined(INET) || defined(INET6)
|
|
struct prison *tppr;
|
|
void *op;
|
|
#endif
|
|
unsigned long hid;
|
|
size_t namelen, onamelen, pnamelen;
|
|
int born, created, cuflags, descend, drflags, enforce;
|
|
int error, errmsg_len, errmsg_pos;
|
|
int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
|
|
int jid, jsys, len, level;
|
|
int childmax, osreldt, rsnum, slevel;
|
|
#if defined(INET) || defined(INET6)
|
|
int ii, ij;
|
|
#endif
|
|
#ifdef INET
|
|
int ip4s, redo_ip4;
|
|
#endif
|
|
#ifdef INET6
|
|
int ip6s, redo_ip6;
|
|
#endif
|
|
uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
|
|
uint64_t pr_allow_diff;
|
|
unsigned tallow;
|
|
char numbuf[12];
|
|
|
|
error = priv_check(td, PRIV_JAIL_SET);
|
|
if (!error && (flags & JAIL_ATTACH))
|
|
error = priv_check(td, PRIV_JAIL_ATTACH);
|
|
if (error)
|
|
return (error);
|
|
mypr = td->td_ucred->cr_prison;
|
|
if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
|
|
return (EPERM);
|
|
if (flags & ~JAIL_SET_MASK)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Check all the parameters before committing to anything. Not all
|
|
* errors can be caught early, but we may as well try. Also, this
|
|
* takes care of some expensive stuff (path lookup) before getting
|
|
* the allprison lock.
|
|
*
|
|
* XXX Jails are not filesystems, and jail parameters are not mount
|
|
* options. But it makes more sense to re-use the vfsopt code
|
|
* than duplicate it under a different name.
|
|
*/
|
|
error = vfs_buildopts(optuio, &opts);
|
|
if (error)
|
|
return (error);
|
|
#ifdef INET
|
|
ip4 = NULL;
|
|
#endif
|
|
#ifdef INET6
|
|
ip6 = NULL;
|
|
#endif
|
|
g_path = NULL;
|
|
|
|
cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
|
|
if (!cuflags) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "no valid operation (create or update)");
|
|
goto done_errmsg;
|
|
}
|
|
|
|
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
|
|
if (error == ENOENT)
|
|
jid = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
|
|
error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
|
|
if (error == ENOENT)
|
|
gotslevel = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else
|
|
gotslevel = 1;
|
|
|
|
error =
|
|
vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
|
|
if (error == ENOENT)
|
|
gotchildmax = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else
|
|
gotchildmax = 1;
|
|
|
|
error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
|
|
if (error == ENOENT)
|
|
gotenforce = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else if (enforce < 0 || enforce > 2) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
} else
|
|
gotenforce = 1;
|
|
|
|
error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
|
|
if (error == ENOENT)
|
|
gotrsnum = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else
|
|
gotrsnum = 1;
|
|
|
|
pr_flags = ch_flags = 0;
|
|
for (bf = pr_flag_bool;
|
|
bf < pr_flag_bool + nitems(pr_flag_bool);
|
|
bf++) {
|
|
vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
|
|
vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
|
|
}
|
|
ch_flags |= pr_flags;
|
|
for (jsf = pr_flag_jailsys;
|
|
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
|
|
jsf++) {
|
|
error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
|
|
if (error == ENOENT)
|
|
continue;
|
|
if (error != 0)
|
|
goto done_free;
|
|
switch (jsys) {
|
|
case JAIL_SYS_DISABLE:
|
|
if (!jsf->disable) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
pr_flags |= jsf->disable;
|
|
break;
|
|
case JAIL_SYS_NEW:
|
|
pr_flags |= jsf->new;
|
|
break;
|
|
case JAIL_SYS_INHERIT:
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
ch_flags |= jsf->new | jsf->disable;
|
|
}
|
|
if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
|
|
&& !(pr_flags & PR_PERSIST)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "new jail must persist or attach");
|
|
goto done_errmsg;
|
|
}
|
|
#ifdef VIMAGE
|
|
if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "vnet cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
#endif
|
|
#ifdef INET
|
|
if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "ip4 cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "ip6 cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
#endif
|
|
|
|
pr_allow = ch_allow = 0;
|
|
for (bf = pr_flag_allow;
|
|
bf < pr_flag_allow + nitems(pr_flag_allow) &&
|
|
atomic_load_int(&bf->flag) != 0;
|
|
bf++) {
|
|
vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
|
|
vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
|
|
}
|
|
ch_allow |= pr_allow;
|
|
|
|
error = vfs_getopt(opts, "name", (void **)&name, &len);
|
|
if (error == ENOENT)
|
|
name = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
if (len == 0 || name[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if (len > MAXHOSTNAMELEN) {
|
|
error = ENAMETOOLONG;
|
|
goto done_free;
|
|
}
|
|
}
|
|
|
|
error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
|
|
if (error == ENOENT)
|
|
host = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
ch_flags |= PR_HOST;
|
|
pr_flags |= PR_HOST;
|
|
if (len == 0 || host[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if (len > MAXHOSTNAMELEN) {
|
|
error = ENAMETOOLONG;
|
|
goto done_free;
|
|
}
|
|
}
|
|
|
|
error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
|
|
if (error == ENOENT)
|
|
domain = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
ch_flags |= PR_HOST;
|
|
pr_flags |= PR_HOST;
|
|
if (len == 0 || domain[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if (len > MAXHOSTNAMELEN) {
|
|
error = ENAMETOOLONG;
|
|
goto done_free;
|
|
}
|
|
}
|
|
|
|
error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
|
|
if (error == ENOENT)
|
|
uuid = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
ch_flags |= PR_HOST;
|
|
pr_flags |= PR_HOST;
|
|
if (len == 0 || uuid[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if (len > HOSTUUIDLEN) {
|
|
error = ENAMETOOLONG;
|
|
goto done_free;
|
|
}
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
|
|
uint32_t hid32;
|
|
|
|
error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
|
|
hid = hid32;
|
|
} else
|
|
#endif
|
|
error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
|
|
if (error == ENOENT)
|
|
gothid = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
gothid = 1;
|
|
ch_flags |= PR_HOST;
|
|
pr_flags |= PR_HOST;
|
|
}
|
|
|
|
#ifdef INET
|
|
error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
|
|
if (error == ENOENT)
|
|
ip4s = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else if (ip4s & (sizeof(*ip4) - 1)) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
} else {
|
|
ch_flags |= PR_IP4_USER;
|
|
pr_flags |= PR_IP4_USER;
|
|
if (ip4s > 0) {
|
|
ip4s /= sizeof(*ip4);
|
|
if (ip4s > jail_max_af_ips) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "too many IPv4 addresses");
|
|
goto done_errmsg;
|
|
}
|
|
ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
|
|
bcopy(op, ip4, ip4s * sizeof(*ip4));
|
|
/*
|
|
* IP addresses are all sorted but ip[0] to preserve
|
|
* the primary IP address as given from userland.
|
|
* This special IP is used for unbound outgoing
|
|
* connections as well for "loopback" traffic in case
|
|
* source address selection cannot find any more fitting
|
|
* address to connect from.
|
|
*/
|
|
if (ip4s > 1)
|
|
qsort(ip4 + 1, ip4s - 1, sizeof(*ip4),
|
|
prison_qcmp_v4);
|
|
/*
|
|
* Check for duplicate addresses and do some simple
|
|
* zero and broadcast checks. If users give other bogus
|
|
* addresses it is their problem.
|
|
*
|
|
* We do not have to care about byte order for these
|
|
* checks so we will do them in NBO.
|
|
*/
|
|
for (ii = 0; ii < ip4s; ii++) {
|
|
if (ip4[ii].s_addr == INADDR_ANY ||
|
|
ip4[ii].s_addr == INADDR_BROADCAST) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if ((ii+1) < ip4s &&
|
|
(ip4[0].s_addr == ip4[ii+1].s_addr ||
|
|
ip4[ii].s_addr == ip4[ii+1].s_addr)) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
|
|
if (error == ENOENT)
|
|
ip6s = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else if (ip6s & (sizeof(*ip6) - 1)) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
} else {
|
|
ch_flags |= PR_IP6_USER;
|
|
pr_flags |= PR_IP6_USER;
|
|
if (ip6s > 0) {
|
|
ip6s /= sizeof(*ip6);
|
|
if (ip6s > jail_max_af_ips) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "too many IPv6 addresses");
|
|
goto done_errmsg;
|
|
}
|
|
ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
|
|
bcopy(op, ip6, ip6s * sizeof(*ip6));
|
|
if (ip6s > 1)
|
|
qsort(ip6 + 1, ip6s - 1, sizeof(*ip6),
|
|
prison_qcmp_v6);
|
|
for (ii = 0; ii < ip6s; ii++) {
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if ((ii+1) < ip6s &&
|
|
(IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
|
|
IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
|
|
{
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(VIMAGE) && (defined(INET) || defined(INET6))
|
|
if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"vnet jails cannot have IP address restrictions");
|
|
goto done_errmsg;
|
|
}
|
|
#endif
|
|
|
|
error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
|
|
if (error == ENOENT)
|
|
osrelstr = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
if (flags & JAIL_UPDATE) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"osrelease cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
if (len == 0 || osrelstr[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
if (len >= OSRELEASELEN) {
|
|
error = ENAMETOOLONG;
|
|
vfs_opterror(opts,
|
|
"osrelease string must be 1-%d bytes long",
|
|
OSRELEASELEN - 1);
|
|
goto done_errmsg;
|
|
}
|
|
}
|
|
|
|
error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
|
|
if (error == ENOENT)
|
|
osreldt = 0;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
if (flags & JAIL_UPDATE) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"osreldate cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
if (osreldt == 0) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "osreldate cannot be 0");
|
|
goto done_errmsg;
|
|
}
|
|
}
|
|
|
|
root = NULL;
|
|
error = vfs_getopt(opts, "path", (void **)&path, &len);
|
|
if (error == ENOENT)
|
|
path = NULL;
|
|
else if (error != 0)
|
|
goto done_free;
|
|
else {
|
|
if (flags & JAIL_UPDATE) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"path cannot be changed after creation");
|
|
goto done_errmsg;
|
|
}
|
|
if (len == 0 || path[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done_free;
|
|
}
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
|
|
path, td);
|
|
error = namei(&nd);
|
|
if (error)
|
|
goto done_free;
|
|
root = nd.ni_vp;
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
|
|
strlcpy(g_path, path, MAXPATHLEN);
|
|
error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
|
|
if (error == 0) {
|
|
path = g_path;
|
|
} else {
|
|
/* exit on other errors */
|
|
goto done_free;
|
|
}
|
|
if (root->v_type != VDIR) {
|
|
error = ENOTDIR;
|
|
vput(root);
|
|
goto done_free;
|
|
}
|
|
VOP_UNLOCK(root);
|
|
}
|
|
|
|
/*
|
|
* Find the specified jail, or at least its parent.
|
|
* This abuses the file error codes ENOENT and EEXIST.
|
|
*/
|
|
pr = NULL;
|
|
inspr = NULL;
|
|
if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
|
|
namelc = strrchr(name, '.');
|
|
jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
|
|
if (*p != '\0')
|
|
jid = 0;
|
|
}
|
|
sx_xlock(&allprison_lock);
|
|
drflags = PD_LIST_XLOCKED;
|
|
ppr = mypr;
|
|
if (!prison_isalive(ppr)) {
|
|
/* This jail is dying. This process will surely follow. */
|
|
error = EAGAIN;
|
|
goto done_deref;
|
|
}
|
|
if (jid != 0) {
|
|
if (jid < 0) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "negative jid");
|
|
goto done_deref;
|
|
}
|
|
/*
|
|
* See if a requested jid already exists. Keep track of
|
|
* where it can be inserted later.
|
|
*/
|
|
TAILQ_FOREACH(inspr, &allprison, pr_list) {
|
|
if (inspr->pr_id < jid)
|
|
continue;
|
|
if (inspr->pr_id > jid)
|
|
break;
|
|
pr = inspr;
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
inspr = NULL;
|
|
break;
|
|
}
|
|
if (pr != NULL) {
|
|
/* Create: jid must not exist. */
|
|
if (cuflags == JAIL_CREATE) {
|
|
/*
|
|
* Even creators that cannot see the jail will
|
|
* get EEXIST.
|
|
*/
|
|
error = EEXIST;
|
|
vfs_opterror(opts, "jail %d already exists",
|
|
jid);
|
|
goto done_deref;
|
|
}
|
|
if (!prison_ischild(mypr, pr)) {
|
|
/*
|
|
* Updaters get ENOENT if they cannot see the
|
|
* jail. This is true even for CREATE | UPDATE,
|
|
* which normally cannot give this error.
|
|
*/
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d not found", jid);
|
|
goto done_deref;
|
|
}
|
|
ppr = pr->pr_parent;
|
|
if (!prison_isalive(ppr)) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d is dying",
|
|
ppr->pr_id);
|
|
goto done_deref;
|
|
}
|
|
if (!prison_isalive(pr)) {
|
|
if (!(flags & JAIL_DYING)) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d is dying",
|
|
jid);
|
|
goto done_deref;
|
|
}
|
|
if ((flags & JAIL_ATTACH) ||
|
|
(pr_flags & PR_PERSIST)) {
|
|
/*
|
|
* A dying jail might be resurrected
|
|
* (via attach or persist), but first
|
|
* it must determine if another jail
|
|
* has claimed its name. Accomplish
|
|
* this by implicitly re-setting the
|
|
* name.
|
|
*/
|
|
if (name == NULL)
|
|
name = prison_name(mypr, pr);
|
|
}
|
|
}
|
|
} else {
|
|
/* Update: jid must exist. */
|
|
if (cuflags == JAIL_UPDATE) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d not found", jid);
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* If the caller provided a name, look for a jail by that name.
|
|
* This has different semantics for creates and updates keyed by jid
|
|
* (where the name must not already exist in a different jail),
|
|
* and updates keyed by the name itself (where the name must exist
|
|
* because that is the jail being updated).
|
|
*/
|
|
namelc = NULL;
|
|
if (name != NULL) {
|
|
namelc = strrchr(name, '.');
|
|
if (namelc == NULL)
|
|
namelc = name;
|
|
else {
|
|
/*
|
|
* This is a hierarchical name. Split it into the
|
|
* parent and child names, and make sure the parent
|
|
* exists or matches an already found jail.
|
|
*/
|
|
if (pr != NULL) {
|
|
if (strncmp(name, ppr->pr_name, namelc - name)
|
|
|| ppr->pr_name[namelc - name] != '\0') {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"cannot change jail's parent");
|
|
goto done_deref;
|
|
}
|
|
} else {
|
|
*namelc = '\0';
|
|
ppr = prison_find_name(mypr, name);
|
|
if (ppr == NULL) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts,
|
|
"jail \"%s\" not found", name);
|
|
goto done_deref;
|
|
}
|
|
mtx_unlock(&ppr->pr_mtx);
|
|
if (!prison_isalive(ppr)) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts,
|
|
"jail \"%s\" is dying", name);
|
|
goto done_deref;
|
|
}
|
|
*namelc = '.';
|
|
}
|
|
namelc++;
|
|
}
|
|
if (namelc[0] != '\0') {
|
|
pnamelen =
|
|
(ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
|
|
deadpr = NULL;
|
|
FOREACH_PRISON_CHILD(ppr, tpr) {
|
|
if (tpr != pr &&
|
|
!strcmp(tpr->pr_name + pnamelen, namelc)) {
|
|
if (prison_isalive(tpr)) {
|
|
if (pr == NULL &&
|
|
cuflags != JAIL_CREATE) {
|
|
/*
|
|
* Use this jail
|
|
* for updates.
|
|
*/
|
|
pr = tpr;
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
break;
|
|
}
|
|
/*
|
|
* Create, or update(jid):
|
|
* name must not exist in an
|
|
* active sibling jail.
|
|
*/
|
|
error = EEXIST;
|
|
vfs_opterror(opts,
|
|
"jail \"%s\" already exists",
|
|
name);
|
|
goto done_deref;
|
|
}
|
|
if (pr == NULL &&
|
|
cuflags != JAIL_CREATE) {
|
|
deadpr = tpr;
|
|
}
|
|
}
|
|
}
|
|
/* If no active jail is found, use a dying one. */
|
|
if (deadpr != NULL && pr == NULL) {
|
|
if (flags & JAIL_DYING) {
|
|
pr = deadpr;
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
} else if (cuflags == JAIL_UPDATE) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts,
|
|
"jail \"%s\" is dying", name);
|
|
goto done_deref;
|
|
}
|
|
}
|
|
/* Update: name must exist if no jid. */
|
|
else if (cuflags == JAIL_UPDATE && pr == NULL) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail \"%s\" not found",
|
|
name);
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
/* Update: must provide a jid or name. */
|
|
else if (cuflags == JAIL_UPDATE && pr == NULL) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "update specified no jail");
|
|
goto done_deref;
|
|
}
|
|
|
|
/* If there's no prison to update, create a new one and link it in. */
|
|
created = pr == NULL;
|
|
if (created) {
|
|
for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
|
|
if (tpr->pr_childcount >= tpr->pr_childmax) {
|
|
error = EPERM;
|
|
vfs_opterror(opts, "prison limit exceeded");
|
|
goto done_deref;
|
|
}
|
|
if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
|
|
error = EAGAIN;
|
|
vfs_opterror(opts, "no available jail IDs");
|
|
goto done_deref;
|
|
}
|
|
|
|
pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
|
|
pr->pr_state = PRISON_STATE_INVALID;
|
|
refcount_init(&pr->pr_ref, 1);
|
|
refcount_init(&pr->pr_uref, 0);
|
|
drflags |= PD_DEREF;
|
|
LIST_INIT(&pr->pr_children);
|
|
mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
|
|
TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
|
|
|
|
pr->pr_id = jid;
|
|
if (inspr != NULL)
|
|
TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
|
|
else
|
|
TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
|
|
|
|
pr->pr_parent = ppr;
|
|
prison_hold(ppr);
|
|
prison_proc_hold(ppr);
|
|
LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
|
|
for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
|
|
tpr->pr_childcount++;
|
|
|
|
/* Set some default values, and inherit some from the parent. */
|
|
if (namelc == NULL)
|
|
namelc = "";
|
|
if (path == NULL) {
|
|
path = "/";
|
|
root = mypr->pr_root;
|
|
vref(root);
|
|
}
|
|
strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
|
|
pr->pr_flags |= PR_HOST;
|
|
#if defined(INET) || defined(INET6)
|
|
#ifdef VIMAGE
|
|
if (!(pr_flags & PR_VNET))
|
|
#endif
|
|
{
|
|
#ifdef INET
|
|
if (!(ch_flags & PR_IP4_USER))
|
|
pr->pr_flags |= PR_IP4 | PR_IP4_USER;
|
|
else if (!(pr_flags & PR_IP4_USER)) {
|
|
pr->pr_flags |= ppr->pr_flags & PR_IP4;
|
|
if (ppr->pr_ip4 != NULL) {
|
|
pr->pr_ip4s = ppr->pr_ip4s;
|
|
pr->pr_ip4 = malloc(pr->pr_ip4s *
|
|
sizeof(struct in_addr), M_PRISON,
|
|
M_WAITOK);
|
|
bcopy(ppr->pr_ip4, pr->pr_ip4,
|
|
pr->pr_ip4s * sizeof(*pr->pr_ip4));
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (!(ch_flags & PR_IP6_USER))
|
|
pr->pr_flags |= PR_IP6 | PR_IP6_USER;
|
|
else if (!(pr_flags & PR_IP6_USER)) {
|
|
pr->pr_flags |= ppr->pr_flags & PR_IP6;
|
|
if (ppr->pr_ip6 != NULL) {
|
|
pr->pr_ip6s = ppr->pr_ip6s;
|
|
pr->pr_ip6 = malloc(pr->pr_ip6s *
|
|
sizeof(struct in6_addr), M_PRISON,
|
|
M_WAITOK);
|
|
bcopy(ppr->pr_ip6, pr->pr_ip6,
|
|
pr->pr_ip6s * sizeof(*pr->pr_ip6));
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
#endif
|
|
/* Source address selection is always on by default. */
|
|
pr->pr_flags |= _PR_IP_SADDRSEL;
|
|
|
|
pr->pr_securelevel = ppr->pr_securelevel;
|
|
pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
|
|
pr->pr_enforce_statfs = jail_default_enforce_statfs;
|
|
pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
|
|
|
|
pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
|
|
if (osrelstr == NULL)
|
|
strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
|
|
sizeof(pr->pr_osrelease));
|
|
else
|
|
strlcpy(pr->pr_osrelease, osrelstr,
|
|
sizeof(pr->pr_osrelease));
|
|
|
|
#ifdef VIMAGE
|
|
/* Allocate a new vnet if specified. */
|
|
pr->pr_vnet = (pr_flags & PR_VNET)
|
|
? vnet_alloc() : ppr->pr_vnet;
|
|
#endif
|
|
/*
|
|
* Allocate a dedicated cpuset for each jail.
|
|
* Unlike other initial settings, this may return an error.
|
|
*/
|
|
error = cpuset_create_root(ppr, &pr->pr_cpuset);
|
|
if (error)
|
|
goto done_deref;
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
} else {
|
|
/*
|
|
* Grab a reference for existing prisons, to ensure they
|
|
* continue to exist for the duration of the call.
|
|
*/
|
|
prison_hold(pr);
|
|
drflags |= PD_DEREF;
|
|
#if defined(VIMAGE) && (defined(INET) || defined(INET6))
|
|
if ((pr->pr_flags & PR_VNET) &&
|
|
(ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"vnet jails cannot have IP address restrictions");
|
|
goto done_deref;
|
|
}
|
|
#endif
|
|
#ifdef INET
|
|
if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"ip4 cannot be changed after creation");
|
|
goto done_deref;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"ip6 cannot be changed after creation");
|
|
goto done_deref;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Do final error checking before setting anything. */
|
|
if (gotslevel) {
|
|
if (slevel < ppr->pr_securelevel) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
if (gotchildmax) {
|
|
if (childmax >= ppr->pr_childmax) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
if (gotenforce) {
|
|
if (enforce < ppr->pr_enforce_statfs) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
if (gotrsnum) {
|
|
/*
|
|
* devfs_rsnum is a uint16_t
|
|
*/
|
|
if (rsnum < 0 || rsnum > 65535) {
|
|
error = EINVAL;
|
|
goto done_deref;
|
|
}
|
|
/*
|
|
* Nested jails always inherit parent's devfs ruleset
|
|
*/
|
|
if (jailed(td->td_ucred)) {
|
|
if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
} else
|
|
rsnum = ppr->pr_devfs_rsnum;
|
|
}
|
|
}
|
|
#ifdef INET
|
|
if (ip4s > 0) {
|
|
if (ppr->pr_flags & PR_IP4) {
|
|
/*
|
|
* Make sure the new set of IP addresses is a
|
|
* subset of the parent's list. Don't worry
|
|
* about the parent being unlocked, as any
|
|
* setting is done with allprison_lock held.
|
|
*/
|
|
for (ij = 0; ij < ppr->pr_ip4s; ij++)
|
|
if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
|
|
break;
|
|
if (ij == ppr->pr_ip4s) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
if (ip4s > 1) {
|
|
for (ii = ij = 1; ii < ip4s; ii++) {
|
|
if (ip4[ii].s_addr ==
|
|
ppr->pr_ip4[0].s_addr)
|
|
continue;
|
|
for (; ij < ppr->pr_ip4s; ij++)
|
|
if (ip4[ii].s_addr ==
|
|
ppr->pr_ip4[ij].s_addr)
|
|
break;
|
|
if (ij == ppr->pr_ip4s)
|
|
break;
|
|
}
|
|
if (ij == ppr->pr_ip4s) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* Check for conflicting IP addresses. We permit them
|
|
* if there is no more than one IP on each jail. If
|
|
* there is a duplicate on a jail with more than one
|
|
* IP stop checking and return error.
|
|
*/
|
|
#ifdef VIMAGE
|
|
for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
|
|
if (tppr->pr_flags & PR_VNET)
|
|
break;
|
|
#else
|
|
tppr = &prison0;
|
|
#endif
|
|
FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
|
|
if (tpr == pr ||
|
|
#ifdef VIMAGE
|
|
(tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
|
|
#endif
|
|
!prison_isalive(tpr)) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
if (!(tpr->pr_flags & PR_IP4_USER))
|
|
continue;
|
|
descend = 0;
|
|
if (tpr->pr_ip4 == NULL ||
|
|
(ip4s == 1 && tpr->pr_ip4s == 1))
|
|
continue;
|
|
for (ii = 0; ii < ip4s; ii++) {
|
|
if (prison_check_ip4_locked(tpr, &ip4[ii]) ==
|
|
0) {
|
|
error = EADDRINUSE;
|
|
vfs_opterror(opts,
|
|
"IPv4 addresses clash");
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (ip6s > 0) {
|
|
if (ppr->pr_flags & PR_IP6) {
|
|
/*
|
|
* Make sure the new set of IP addresses is a
|
|
* subset of the parent's list.
|
|
*/
|
|
for (ij = 0; ij < ppr->pr_ip6s; ij++)
|
|
if (IN6_ARE_ADDR_EQUAL(&ip6[0],
|
|
&ppr->pr_ip6[ij]))
|
|
break;
|
|
if (ij == ppr->pr_ip6s) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
if (ip6s > 1) {
|
|
for (ii = ij = 1; ii < ip6s; ii++) {
|
|
if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
|
|
&ppr->pr_ip6[0]))
|
|
continue;
|
|
for (; ij < ppr->pr_ip6s; ij++)
|
|
if (IN6_ARE_ADDR_EQUAL(
|
|
&ip6[ii], &ppr->pr_ip6[ij]))
|
|
break;
|
|
if (ij == ppr->pr_ip6s)
|
|
break;
|
|
}
|
|
if (ij == ppr->pr_ip6s) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
/* Check for conflicting IP addresses. */
|
|
#ifdef VIMAGE
|
|
for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
|
|
if (tppr->pr_flags & PR_VNET)
|
|
break;
|
|
#else
|
|
tppr = &prison0;
|
|
#endif
|
|
FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
|
|
if (tpr == pr ||
|
|
#ifdef VIMAGE
|
|
(tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
|
|
#endif
|
|
!prison_isalive(tpr)) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
if (!(tpr->pr_flags & PR_IP6_USER))
|
|
continue;
|
|
descend = 0;
|
|
if (tpr->pr_ip6 == NULL ||
|
|
(ip6s == 1 && tpr->pr_ip6s == 1))
|
|
continue;
|
|
for (ii = 0; ii < ip6s; ii++) {
|
|
if (prison_check_ip6_locked(tpr, &ip6[ii]) ==
|
|
0) {
|
|
error = EADDRINUSE;
|
|
vfs_opterror(opts,
|
|
"IPv6 addresses clash");
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
onamelen = namelen = 0;
|
|
if (namelc != NULL) {
|
|
/* Give a default name of the jid. Also allow the name to be
|
|
* explicitly the jid - but not any other number, and only in
|
|
* normal form (no leading zero/etc).
|
|
*/
|
|
if (namelc[0] == '\0')
|
|
snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
|
|
else if ((strtoul(namelc, &p, 10) != jid ||
|
|
namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
|
|
error = EINVAL;
|
|
vfs_opterror(opts,
|
|
"name cannot be numeric (unless it is the jid)");
|
|
goto done_deref;
|
|
}
|
|
/*
|
|
* Make sure the name isn't too long for the prison or its
|
|
* children.
|
|
*/
|
|
pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
|
|
onamelen = strlen(pr->pr_name + pnamelen);
|
|
namelen = strlen(namelc);
|
|
if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
|
|
error = ENAMETOOLONG;
|
|
goto done_deref;
|
|
}
|
|
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
|
|
if (strlen(tpr->pr_name) + (namelen - onamelen) >=
|
|
sizeof(pr->pr_name)) {
|
|
error = ENAMETOOLONG;
|
|
goto done_deref;
|
|
}
|
|
}
|
|
}
|
|
pr_allow_diff = pr_allow & ~ppr->pr_allow;
|
|
if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
|
|
error = EPERM;
|
|
goto done_deref;
|
|
}
|
|
|
|
/*
|
|
* Let modules check their parameters. This requires unlocking and
|
|
* then re-locking the prison, but this is still a valid state as long
|
|
* as allprison_lock remains xlocked.
|
|
*/
|
|
mtx_unlock(&pr->pr_mtx);
|
|
drflags &= ~PD_LOCKED;
|
|
error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
|
|
if (error != 0)
|
|
goto done_deref;
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
|
|
/* At this point, all valid parameters should have been noted. */
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (!opt->seen && strcmp(opt->name, "errmsg")) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "unknown parameter: %s", opt->name);
|
|
goto done_deref;
|
|
}
|
|
}
|
|
|
|
/* Set the parameters of the prison. */
|
|
#ifdef INET
|
|
redo_ip4 = 0;
|
|
if (pr_flags & PR_IP4_USER) {
|
|
pr->pr_flags |= PR_IP4;
|
|
free(pr->pr_ip4, M_PRISON);
|
|
pr->pr_ip4s = ip4s;
|
|
pr->pr_ip4 = ip4;
|
|
ip4 = NULL;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
#ifdef VIMAGE
|
|
if (tpr->pr_flags & PR_VNET) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
#endif
|
|
if (prison_restrict_ip4(tpr, NULL)) {
|
|
redo_ip4 = 1;
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
redo_ip6 = 0;
|
|
if (pr_flags & PR_IP6_USER) {
|
|
pr->pr_flags |= PR_IP6;
|
|
free(pr->pr_ip6, M_PRISON);
|
|
pr->pr_ip6s = ip6s;
|
|
pr->pr_ip6 = ip6;
|
|
ip6 = NULL;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
#ifdef VIMAGE
|
|
if (tpr->pr_flags & PR_VNET) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
#endif
|
|
if (prison_restrict_ip6(tpr, NULL)) {
|
|
redo_ip6 = 1;
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
if (gotslevel) {
|
|
pr->pr_securelevel = slevel;
|
|
/* Set all child jails to be at least this level. */
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
|
|
if (tpr->pr_securelevel < slevel)
|
|
tpr->pr_securelevel = slevel;
|
|
}
|
|
if (gotchildmax) {
|
|
pr->pr_childmax = childmax;
|
|
/* Set all child jails to under this limit. */
|
|
FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
|
|
if (tpr->pr_childmax > childmax - level)
|
|
tpr->pr_childmax = childmax > level
|
|
? childmax - level : 0;
|
|
}
|
|
if (gotenforce) {
|
|
pr->pr_enforce_statfs = enforce;
|
|
/* Pass this restriction on to the children. */
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
|
|
if (tpr->pr_enforce_statfs < enforce)
|
|
tpr->pr_enforce_statfs = enforce;
|
|
}
|
|
if (gotrsnum) {
|
|
pr->pr_devfs_rsnum = rsnum;
|
|
/* Pass this restriction on to the children. */
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
|
|
tpr->pr_devfs_rsnum = rsnum;
|
|
}
|
|
if (namelc != NULL) {
|
|
if (ppr == &prison0)
|
|
strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
|
|
else
|
|
snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
|
|
ppr->pr_name, namelc);
|
|
/* Change this component of child names. */
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
|
|
strlen(tpr->pr_name + onamelen) + 1);
|
|
bcopy(pr->pr_name, tpr->pr_name, namelen);
|
|
}
|
|
}
|
|
if (path != NULL) {
|
|
/* Try to keep a real-rooted full pathname. */
|
|
strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
|
|
pr->pr_root = root;
|
|
root = NULL;
|
|
}
|
|
if (PR_HOST & ch_flags & ~pr_flags) {
|
|
if (pr->pr_flags & PR_HOST) {
|
|
/*
|
|
* Copy the parent's host info. As with pr_ip4 above,
|
|
* the lack of a lock on the parent is not a problem;
|
|
* it is always set with allprison_lock at least
|
|
* shared, and is held exclusively here.
|
|
*/
|
|
strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
|
|
sizeof(pr->pr_hostname));
|
|
strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
|
|
sizeof(pr->pr_domainname));
|
|
strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
|
|
sizeof(pr->pr_hostuuid));
|
|
pr->pr_hostid = pr->pr_parent->pr_hostid;
|
|
}
|
|
} else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
|
|
/* Set this prison, and any descendants without PR_HOST. */
|
|
if (host != NULL)
|
|
strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
|
|
if (domain != NULL)
|
|
strlcpy(pr->pr_domainname, domain,
|
|
sizeof(pr->pr_domainname));
|
|
if (uuid != NULL)
|
|
strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
|
|
if (gothid)
|
|
pr->pr_hostid = hid;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
if (tpr->pr_flags & PR_HOST)
|
|
descend = 0;
|
|
else {
|
|
if (host != NULL)
|
|
strlcpy(tpr->pr_hostname,
|
|
pr->pr_hostname,
|
|
sizeof(tpr->pr_hostname));
|
|
if (domain != NULL)
|
|
strlcpy(tpr->pr_domainname,
|
|
pr->pr_domainname,
|
|
sizeof(tpr->pr_domainname));
|
|
if (uuid != NULL)
|
|
strlcpy(tpr->pr_hostuuid,
|
|
pr->pr_hostuuid,
|
|
sizeof(tpr->pr_hostuuid));
|
|
if (gothid)
|
|
tpr->pr_hostid = hid;
|
|
}
|
|
}
|
|
}
|
|
pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
|
|
if ((tallow = ch_allow & ~pr_allow))
|
|
prison_set_allow_locked(pr, tallow, 0);
|
|
/*
|
|
* Persistent prisons get an extra reference, and prisons losing their
|
|
* persist flag lose that reference.
|
|
*/
|
|
born = !prison_isalive(pr);
|
|
if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
|
|
if (pr_flags & PR_PERSIST) {
|
|
prison_hold(pr);
|
|
/*
|
|
* This may make a dead prison alive again, but wait
|
|
* to label it as such until after OSD calls have had
|
|
* a chance to run (and perhaps to fail).
|
|
*/
|
|
refcount_acquire(&pr->pr_uref);
|
|
} else {
|
|
drflags |= PD_DEUREF;
|
|
prison_free_not_last(pr);
|
|
}
|
|
}
|
|
pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
drflags &= ~PD_LOCKED;
|
|
/*
|
|
* Any errors past this point will need to de-persist newly created
|
|
* prisons, as well as call remove methods.
|
|
*/
|
|
if (born)
|
|
drflags |= PD_KILL;
|
|
|
|
#ifdef RACCT
|
|
if (racct_enable && created)
|
|
prison_racct_attach(pr);
|
|
#endif
|
|
|
|
/* Locks may have prevented a complete restriction of child IP
|
|
* addresses. If so, allocate some more memory and try again.
|
|
*/
|
|
#ifdef INET
|
|
while (redo_ip4) {
|
|
ip4s = pr->pr_ip4s;
|
|
ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
|
|
mtx_lock(&pr->pr_mtx);
|
|
redo_ip4 = 0;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
#ifdef VIMAGE
|
|
if (tpr->pr_flags & PR_VNET) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
#endif
|
|
if (prison_restrict_ip4(tpr, ip4)) {
|
|
if (ip4 != NULL)
|
|
ip4 = NULL;
|
|
else
|
|
redo_ip4 = 1;
|
|
}
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
while (redo_ip6) {
|
|
ip6s = pr->pr_ip6s;
|
|
ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
|
|
mtx_lock(&pr->pr_mtx);
|
|
redo_ip6 = 0;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
|
|
#ifdef VIMAGE
|
|
if (tpr->pr_flags & PR_VNET) {
|
|
descend = 0;
|
|
continue;
|
|
}
|
|
#endif
|
|
if (prison_restrict_ip6(tpr, ip6)) {
|
|
if (ip6 != NULL)
|
|
ip6 = NULL;
|
|
else
|
|
redo_ip6 = 1;
|
|
}
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
#endif
|
|
|
|
/* Let the modules do their work. */
|
|
if (born) {
|
|
error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
|
|
if (error)
|
|
goto done_deref;
|
|
}
|
|
error = osd_jail_call(pr, PR_METHOD_SET, opts);
|
|
if (error)
|
|
goto done_deref;
|
|
|
|
/*
|
|
* A new prison is now ready to be seen; either it has gained a user
|
|
* reference via persistence, or is about to gain one via attachment.
|
|
*/
|
|
if (born) {
|
|
drflags = prison_lock_xlock(pr, drflags);
|
|
pr->pr_state = PRISON_STATE_ALIVE;
|
|
}
|
|
|
|
/* Attach this process to the prison if requested. */
|
|
if (flags & JAIL_ATTACH) {
|
|
error = do_jail_attach(td, pr,
|
|
prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
|
|
drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
|
|
if (error) {
|
|
vfs_opterror(opts, "attach failed");
|
|
goto done_deref;
|
|
}
|
|
}
|
|
|
|
#ifdef RACCT
|
|
if (racct_enable && !created) {
|
|
if (drflags & PD_LOCKED) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
drflags &= ~PD_LOCKED;
|
|
}
|
|
if (drflags & PD_LIST_XLOCKED) {
|
|
sx_xunlock(&allprison_lock);
|
|
drflags &= ~PD_LIST_XLOCKED;
|
|
}
|
|
prison_racct_modify(pr);
|
|
}
|
|
#endif
|
|
|
|
drflags &= ~PD_KILL;
|
|
td->td_retval[0] = pr->pr_id;
|
|
|
|
done_deref:
|
|
/* Release any temporary prison holds and/or locks. */
|
|
if (pr != NULL)
|
|
prison_deref(pr, drflags);
|
|
else if (drflags & PD_LIST_SLOCKED)
|
|
sx_sunlock(&allprison_lock);
|
|
else if (drflags & PD_LIST_XLOCKED)
|
|
sx_xunlock(&allprison_lock);
|
|
if (root != NULL)
|
|
vrele(root);
|
|
done_errmsg:
|
|
if (error) {
|
|
/* Write the error message back to userspace. */
|
|
if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
|
|
&errmsg_len) == 0 && errmsg_len > 0) {
|
|
errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
|
|
if (optuio->uio_segflg == UIO_SYSSPACE)
|
|
bcopy(errmsg,
|
|
optuio->uio_iov[errmsg_pos].iov_base,
|
|
errmsg_len);
|
|
else
|
|
copyout(errmsg,
|
|
optuio->uio_iov[errmsg_pos].iov_base,
|
|
errmsg_len);
|
|
}
|
|
}
|
|
done_free:
|
|
#ifdef INET
|
|
free(ip4, M_PRISON);
|
|
#endif
|
|
#ifdef INET6
|
|
free(ip6, M_PRISON);
|
|
#endif
|
|
if (g_path != NULL)
|
|
free(g_path, M_TEMP);
|
|
vfs_freeopts(opts);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Find the next available prison ID. Return the ID on success, or zero
|
|
* on failure. Also set a pointer to the allprison list entry the prison
|
|
* should be inserted before.
|
|
*/
|
|
static int
|
|
get_next_prid(struct prison **insprp)
|
|
{
|
|
struct prison *inspr;
|
|
int jid, maxid;
|
|
|
|
jid = lastprid % JAIL_MAX + 1;
|
|
if (TAILQ_EMPTY(&allprison) ||
|
|
TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
|
|
/*
|
|
* A common case is for all jails to be implicitly numbered,
|
|
* which means they'll go on the end of the list, at least
|
|
* for the first JAIL_MAX times.
|
|
*/
|
|
inspr = NULL;
|
|
} else {
|
|
/*
|
|
* Take two passes through the allprison list: first starting
|
|
* with the proposed jid, then ending with it.
|
|
*/
|
|
for (maxid = JAIL_MAX; maxid != 0; ) {
|
|
TAILQ_FOREACH(inspr, &allprison, pr_list) {
|
|
if (inspr->pr_id < jid)
|
|
continue;
|
|
if (inspr->pr_id > jid) {
|
|
/* Found an opening. */
|
|
maxid = 0;
|
|
break;
|
|
}
|
|
if (++jid > maxid) {
|
|
if (lastprid == maxid || lastprid == 0)
|
|
{
|
|
/*
|
|
* The entire legal range
|
|
* has been traversed
|
|
*/
|
|
return 0;
|
|
}
|
|
/* Try again from the start. */
|
|
jid = 1;
|
|
maxid = lastprid;
|
|
break;
|
|
}
|
|
}
|
|
if (inspr == NULL) {
|
|
/* Found room at the end of the list. */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
*insprp = inspr;
|
|
lastprid = jid;
|
|
return (jid);
|
|
}
|
|
|
|
/*
|
|
* struct jail_get_args {
|
|
* struct iovec *iovp;
|
|
* unsigned int iovcnt;
|
|
* int flags;
|
|
* };
|
|
*/
|
|
int
|
|
sys_jail_get(struct thread *td, struct jail_get_args *uap)
|
|
{
|
|
struct uio *auio;
|
|
int error;
|
|
|
|
/* Check that we have an even number of iovecs. */
|
|
if (uap->iovcnt & 1)
|
|
return (EINVAL);
|
|
|
|
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
|
|
if (error)
|
|
return (error);
|
|
error = kern_jail_get(td, auio, uap->flags);
|
|
if (error == 0)
|
|
error = copyout(auio->uio_iov, uap->iovp,
|
|
uap->iovcnt * sizeof (struct iovec));
|
|
free(auio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_jail_get(struct thread *td, struct uio *optuio, int flags)
|
|
{
|
|
struct bool_flags *bf;
|
|
struct jailsys_flags *jsf;
|
|
struct prison *pr, *mypr;
|
|
struct vfsopt *opt;
|
|
struct vfsoptlist *opts;
|
|
char *errmsg, *name;
|
|
int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
|
|
unsigned f;
|
|
|
|
if (flags & ~JAIL_GET_MASK)
|
|
return (EINVAL);
|
|
|
|
/* Get the parameter list. */
|
|
error = vfs_buildopts(optuio, &opts);
|
|
if (error)
|
|
return (error);
|
|
errmsg_pos = vfs_getopt_pos(opts, "errmsg");
|
|
mypr = td->td_ucred->cr_prison;
|
|
pr = NULL;
|
|
|
|
/*
|
|
* Find the prison specified by one of: lastjid, jid, name.
|
|
*/
|
|
sx_slock(&allprison_lock);
|
|
drflags = PD_LIST_SLOCKED;
|
|
error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
|
|
if (error == 0) {
|
|
TAILQ_FOREACH(pr, &allprison, pr_list) {
|
|
if (pr->pr_id > jid &&
|
|
((flags & JAIL_DYING) || prison_isalive(pr)) &&
|
|
prison_ischild(mypr, pr)) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
drflags |= PD_LOCKED;
|
|
goto found_prison;
|
|
}
|
|
}
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "no jail after %d", jid);
|
|
goto done;
|
|
} else if (error != ENOENT)
|
|
goto done;
|
|
|
|
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
|
|
if (error == 0) {
|
|
if (jid != 0) {
|
|
pr = prison_find_child(mypr, jid);
|
|
if (pr != NULL) {
|
|
drflags |= PD_LOCKED;
|
|
if (!(prison_isalive(pr) ||
|
|
(flags & JAIL_DYING))) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d is dying",
|
|
jid);
|
|
goto done;
|
|
}
|
|
goto found_prison;
|
|
}
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail %d not found", jid);
|
|
goto done;
|
|
}
|
|
} else if (error != ENOENT)
|
|
goto done;
|
|
|
|
error = vfs_getopt(opts, "name", (void **)&name, &len);
|
|
if (error == 0) {
|
|
if (len == 0 || name[len - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
pr = prison_find_name(mypr, name);
|
|
if (pr != NULL) {
|
|
drflags |= PD_LOCKED;
|
|
if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail \"%s\" is dying",
|
|
name);
|
|
goto done;
|
|
}
|
|
goto found_prison;
|
|
}
|
|
error = ENOENT;
|
|
vfs_opterror(opts, "jail \"%s\" not found", name);
|
|
goto done;
|
|
} else if (error != ENOENT)
|
|
goto done;
|
|
|
|
vfs_opterror(opts, "no jail specified");
|
|
error = ENOENT;
|
|
goto done;
|
|
|
|
found_prison:
|
|
/* Get the parameters of the prison. */
|
|
prison_hold(pr);
|
|
drflags |= PD_DEREF;
|
|
td->td_retval[0] = pr->pr_id;
|
|
error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
|
|
error = vfs_setopt(opts, "parent", &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "name", prison_name(mypr, pr));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
|
|
sizeof(pr->pr_cpuset->cs_id));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "path", prison_path(mypr, pr));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
#ifdef INET
|
|
error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
|
|
pr->pr_ip4s * sizeof(*pr->pr_ip4));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
#endif
|
|
#ifdef INET6
|
|
error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
|
|
pr->pr_ip6s * sizeof(*pr->pr_ip6));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
#endif
|
|
error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
|
|
sizeof(pr->pr_securelevel));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
|
|
sizeof(pr->pr_childcount));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
|
|
sizeof(pr->pr_childmax));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
|
|
uint32_t hid32 = pr->pr_hostid;
|
|
|
|
error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
|
|
} else
|
|
#endif
|
|
error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
|
|
sizeof(pr->pr_hostid));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
|
|
sizeof(pr->pr_enforce_statfs));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
|
|
sizeof(pr->pr_devfs_rsnum));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
for (bf = pr_flag_bool;
|
|
bf < pr_flag_bool + nitems(pr_flag_bool);
|
|
bf++) {
|
|
i = (pr->pr_flags & bf->flag) ? 1 : 0;
|
|
error = vfs_setopt(opts, bf->name, &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
i = !i;
|
|
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
}
|
|
for (jsf = pr_flag_jailsys;
|
|
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
|
|
jsf++) {
|
|
f = pr->pr_flags & (jsf->disable | jsf->new);
|
|
i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
|
|
: (f == jsf->new) ? JAIL_SYS_NEW
|
|
: JAIL_SYS_INHERIT;
|
|
error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
}
|
|
for (bf = pr_flag_allow;
|
|
bf < pr_flag_allow + nitems(pr_flag_allow) &&
|
|
atomic_load_int(&bf->flag) != 0;
|
|
bf++) {
|
|
i = (pr->pr_allow & bf->flag) ? 1 : 0;
|
|
error = vfs_setopt(opts, bf->name, &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
i = !i;
|
|
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
}
|
|
i = !prison_isalive(pr);
|
|
error = vfs_setopt(opts, "dying", &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
i = !i;
|
|
error = vfs_setopt(opts, "nodying", &i, sizeof(i));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
|
|
sizeof(pr->pr_osreldate));
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
|
|
if (error != 0 && error != ENOENT)
|
|
goto done;
|
|
|
|
/* Get the module parameters. */
|
|
mtx_unlock(&pr->pr_mtx);
|
|
drflags &= ~PD_LOCKED;
|
|
error = osd_jail_call(pr, PR_METHOD_GET, opts);
|
|
if (error)
|
|
goto done;
|
|
prison_deref(pr, drflags);
|
|
pr = NULL;
|
|
drflags = 0;
|
|
|
|
/* By now, all parameters should have been noted. */
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (!opt->seen && strcmp(opt->name, "errmsg")) {
|
|
error = EINVAL;
|
|
vfs_opterror(opts, "unknown parameter: %s", opt->name);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* Write the fetched parameters back to userspace. */
|
|
error = 0;
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (opt->pos >= 0 && opt->pos != errmsg_pos) {
|
|
pos = 2 * opt->pos + 1;
|
|
optuio->uio_iov[pos].iov_len = opt->len;
|
|
if (opt->value != NULL) {
|
|
if (optuio->uio_segflg == UIO_SYSSPACE) {
|
|
bcopy(opt->value,
|
|
optuio->uio_iov[pos].iov_base,
|
|
opt->len);
|
|
} else {
|
|
error = copyout(opt->value,
|
|
optuio->uio_iov[pos].iov_base,
|
|
opt->len);
|
|
if (error)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
/* Release any temporary prison holds and/or locks. */
|
|
if (pr != NULL)
|
|
prison_deref(pr, drflags);
|
|
else if (drflags & PD_LIST_SLOCKED)
|
|
sx_sunlock(&allprison_lock);
|
|
if (error && errmsg_pos >= 0) {
|
|
/* Write the error message back to userspace. */
|
|
vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
|
|
errmsg_pos = 2 * errmsg_pos + 1;
|
|
if (errmsg_len > 0) {
|
|
if (optuio->uio_segflg == UIO_SYSSPACE)
|
|
bcopy(errmsg,
|
|
optuio->uio_iov[errmsg_pos].iov_base,
|
|
errmsg_len);
|
|
else
|
|
copyout(errmsg,
|
|
optuio->uio_iov[errmsg_pos].iov_base,
|
|
errmsg_len);
|
|
}
|
|
}
|
|
vfs_freeopts(opts);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* struct jail_remove_args {
|
|
* int jid;
|
|
* };
|
|
*/
|
|
int
|
|
sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
|
|
{
|
|
struct prison *pr;
|
|
int error;
|
|
|
|
error = priv_check(td, PRIV_JAIL_REMOVE);
|
|
if (error)
|
|
return (error);
|
|
|
|
sx_xlock(&allprison_lock);
|
|
pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
|
|
if (pr == NULL) {
|
|
sx_xunlock(&allprison_lock);
|
|
return (EINVAL);
|
|
}
|
|
if (!prison_isalive(pr)) {
|
|
/* Silently ignore already-dying prisons. */
|
|
mtx_unlock(&pr->pr_mtx);
|
|
sx_xunlock(&allprison_lock);
|
|
return (0);
|
|
}
|
|
prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* struct jail_attach_args {
|
|
* int jid;
|
|
* };
|
|
*/
|
|
int
|
|
sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
|
|
{
|
|
struct prison *pr;
|
|
int error;
|
|
|
|
error = priv_check(td, PRIV_JAIL_ATTACH);
|
|
if (error)
|
|
return (error);
|
|
|
|
sx_slock(&allprison_lock);
|
|
pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
|
|
if (pr == NULL) {
|
|
sx_sunlock(&allprison_lock);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Do not allow a process to attach to a prison that is not alive. */
|
|
if (!prison_isalive(pr)) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
sx_sunlock(&allprison_lock);
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
|
|
}
|
|
|
|
static int
|
|
do_jail_attach(struct thread *td, struct prison *pr, int drflags)
|
|
{
|
|
struct proc *p;
|
|
struct ucred *newcred, *oldcred;
|
|
int error;
|
|
|
|
mtx_assert(&pr->pr_mtx, MA_OWNED);
|
|
sx_assert(&allprison_lock, SX_LOCKED);
|
|
drflags &= PD_LOCK_FLAGS;
|
|
/*
|
|
* XXX: Note that there is a slight race here if two threads
|
|
* in the same privileged process attempt to attach to two
|
|
* different jails at the same time. It is important for
|
|
* user processes not to do this, or they might end up with
|
|
* a process root from one prison, but attached to the jail
|
|
* of another.
|
|
*/
|
|
prison_hold(pr);
|
|
refcount_acquire(&pr->pr_uref);
|
|
drflags |= PD_DEREF | PD_DEUREF;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
drflags &= ~PD_LOCKED;
|
|
|
|
/* Let modules do whatever they need to prepare for attaching. */
|
|
error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
|
|
if (error) {
|
|
prison_deref(pr, drflags);
|
|
return (error);
|
|
}
|
|
sx_unlock(&allprison_lock);
|
|
drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
|
|
|
|
/*
|
|
* Reparent the newly attached process to this jail.
|
|
*/
|
|
p = td->td_proc;
|
|
error = cpuset_setproc_update_set(p, pr->pr_cpuset);
|
|
if (error)
|
|
goto e_revert_osd;
|
|
|
|
vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
|
|
if ((error = change_dir(pr->pr_root, td)) != 0)
|
|
goto e_unlock;
|
|
#ifdef MAC
|
|
if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
|
|
goto e_unlock;
|
|
#endif
|
|
VOP_UNLOCK(pr->pr_root);
|
|
if ((error = pwd_chroot_chdir(td, pr->pr_root)))
|
|
goto e_revert_osd;
|
|
|
|
newcred = crget();
|
|
PROC_LOCK(p);
|
|
oldcred = crcopysafe(p, newcred);
|
|
newcred->cr_prison = pr;
|
|
proc_set_cred(p, newcred);
|
|
setsugid(p);
|
|
#ifdef RACCT
|
|
racct_proc_ucred_changed(p, oldcred, newcred);
|
|
crhold(newcred);
|
|
#endif
|
|
PROC_UNLOCK(p);
|
|
#ifdef RCTL
|
|
rctl_proc_ucred_changed(p, newcred);
|
|
crfree(newcred);
|
|
#endif
|
|
prison_deref(oldcred->cr_prison, drflags);
|
|
crfree(oldcred);
|
|
|
|
/*
|
|
* If the prison was killed while changing credentials, die along
|
|
* with it.
|
|
*/
|
|
if (!prison_isalive(pr)) {
|
|
PROC_LOCK(p);
|
|
kern_psignal(p, SIGKILL);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
return (0);
|
|
|
|
e_unlock:
|
|
VOP_UNLOCK(pr->pr_root);
|
|
e_revert_osd:
|
|
/* Tell modules this thread is still in its old jail after all. */
|
|
sx_slock(&allprison_lock);
|
|
drflags |= PD_LIST_SLOCKED;
|
|
(void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
|
|
prison_deref(pr, drflags);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Returns a locked prison instance, or NULL on failure.
|
|
*/
|
|
struct prison *
|
|
prison_find(int prid)
|
|
{
|
|
struct prison *pr;
|
|
|
|
sx_assert(&allprison_lock, SX_LOCKED);
|
|
TAILQ_FOREACH(pr, &allprison, pr_list) {
|
|
if (pr->pr_id < prid)
|
|
continue;
|
|
if (pr->pr_id > prid)
|
|
break;
|
|
KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
|
|
mtx_lock(&pr->pr_mtx);
|
|
return (pr);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
|
|
*/
|
|
struct prison *
|
|
prison_find_child(struct prison *mypr, int prid)
|
|
{
|
|
struct prison *pr;
|
|
int descend;
|
|
|
|
sx_assert(&allprison_lock, SX_LOCKED);
|
|
FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
|
|
if (pr->pr_id == prid) {
|
|
KASSERT(prison_isvalid(pr),
|
|
("Found invalid prison %p", pr));
|
|
mtx_lock(&pr->pr_mtx);
|
|
return (pr);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Look for the name relative to mypr. Returns a locked prison or NULL.
|
|
*/
|
|
struct prison *
|
|
prison_find_name(struct prison *mypr, const char *name)
|
|
{
|
|
struct prison *pr, *deadpr;
|
|
size_t mylen;
|
|
int descend;
|
|
|
|
sx_assert(&allprison_lock, SX_LOCKED);
|
|
mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
|
|
deadpr = NULL;
|
|
FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
|
|
if (!strcmp(pr->pr_name + mylen, name)) {
|
|
KASSERT(prison_isvalid(pr),
|
|
("Found invalid prison %p", pr));
|
|
if (prison_isalive(pr)) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
return (pr);
|
|
}
|
|
deadpr = pr;
|
|
}
|
|
}
|
|
/* There was no valid prison - perhaps there was a dying one. */
|
|
if (deadpr != NULL)
|
|
mtx_lock(&deadpr->pr_mtx);
|
|
return (deadpr);
|
|
}
|
|
|
|
/*
|
|
* See if a prison has the specific flag set. The prison should be locked,
|
|
* unless checking for flags that are only set at jail creation (such as
|
|
* PR_IP4 and PR_IP6), or only the single bit is examined, without regard
|
|
* to any other prison data.
|
|
*/
|
|
int
|
|
prison_flag(struct ucred *cred, unsigned flag)
|
|
{
|
|
|
|
return (cred->cr_prison->pr_flags & flag);
|
|
}
|
|
|
|
int
|
|
prison_allow(struct ucred *cred, unsigned flag)
|
|
{
|
|
|
|
return ((cred->cr_prison->pr_allow & flag) != 0);
|
|
}
|
|
|
|
/*
|
|
* Hold a prison reference, by incrementing pr_ref. It is generally
|
|
* an error to hold a prison that does not already have a reference.
|
|
* A prison record will remain valid as long as it has at least one
|
|
* reference, and will not be removed as long as either the prison
|
|
* mutex or the allprison lock is held (allprison_lock may be shared).
|
|
*/
|
|
void
|
|
prison_hold_locked(struct prison *pr)
|
|
{
|
|
|
|
/* Locking is no longer required. */
|
|
prison_hold(pr);
|
|
}
|
|
|
|
void
|
|
prison_hold(struct prison *pr)
|
|
{
|
|
#ifdef INVARIANTS
|
|
int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
|
|
|
|
KASSERT(was_valid,
|
|
("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
|
|
#else
|
|
refcount_acquire(&pr->pr_ref);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Remove a prison reference. If that was the last reference, the
|
|
* prison will be removed (at a later time).
|
|
*/
|
|
void
|
|
prison_free_locked(struct prison *pr)
|
|
{
|
|
|
|
mtx_assert(&pr->pr_mtx, MA_OWNED);
|
|
/*
|
|
* Locking is no longer required, but unlock because the caller
|
|
* expects it.
|
|
*/
|
|
mtx_unlock(&pr->pr_mtx);
|
|
prison_free(pr);
|
|
}
|
|
|
|
void
|
|
prison_free(struct prison *pr)
|
|
{
|
|
|
|
KASSERT(refcount_load(&pr->pr_ref) > 0,
|
|
("Trying to free dead prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
if (!refcount_release_if_not_last(&pr->pr_ref)) {
|
|
/*
|
|
* Don't remove the last reference in this context,
|
|
* in case there are locks held.
|
|
*/
|
|
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
|
|
}
|
|
}
|
|
|
|
static void
|
|
prison_free_not_last(struct prison *pr)
|
|
{
|
|
#ifdef INVARIANTS
|
|
int lastref;
|
|
|
|
KASSERT(refcount_load(&pr->pr_ref) > 0,
|
|
("Trying to free dead prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
lastref = refcount_release(&pr->pr_ref);
|
|
KASSERT(!lastref,
|
|
("prison_free_not_last freed last ref on prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
#else
|
|
refcount_release(&pr->pr_ref);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Hold a a prison for user visibility, by incrementing pr_uref.
|
|
* It is generally an error to hold a prison that isn't already
|
|
* user-visible, except through the the jail system calls. It is also
|
|
* an error to hold an invalid prison. A prison record will remain
|
|
* alive as long as it has at least one user reference, and will not
|
|
* be set to the dying state until the prison mutex and allprison_lock
|
|
* are both freed.
|
|
*/
|
|
void
|
|
prison_proc_hold(struct prison *pr)
|
|
{
|
|
#ifdef INVARIANTS
|
|
int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
|
|
|
|
KASSERT(was_alive,
|
|
("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
|
|
#else
|
|
refcount_acquire(&pr->pr_uref);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Remove a prison user reference. If it was the last reference, the
|
|
* prison will be considered "dying", and may be removed once all of
|
|
* its references are dropped.
|
|
*/
|
|
void
|
|
prison_proc_free(struct prison *pr)
|
|
{
|
|
|
|
/*
|
|
* Locking is only required when releasing the last reference.
|
|
* This allows assurance that a locked prison will remain alive
|
|
* until it is unlocked.
|
|
*/
|
|
KASSERT(refcount_load(&pr->pr_uref) > 0,
|
|
("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
|
|
if (!refcount_release_if_not_last(&pr->pr_uref)) {
|
|
/*
|
|
* Don't remove the last user reference in this context,
|
|
* which is expected to be a process that is not only locked,
|
|
* but also half dead. Add a reference so any calls to
|
|
* prison_free() won't re-submit the task.
|
|
*/
|
|
prison_hold(pr);
|
|
mtx_lock(&pr->pr_mtx);
|
|
KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
|
|
("Redundant last reference in prison_proc_free (jid=%d)",
|
|
pr->pr_id));
|
|
pr->pr_flags |= PR_COMPLETE_PROC;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
|
|
}
|
|
}
|
|
|
|
static void
|
|
prison_proc_free_not_last(struct prison *pr)
|
|
{
|
|
#ifdef INVARIANTS
|
|
int lastref;
|
|
|
|
KASSERT(refcount_load(&pr->pr_uref) > 0,
|
|
("Trying to free dead prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
lastref = refcount_release(&pr->pr_uref);
|
|
KASSERT(!lastref,
|
|
("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
#else
|
|
refcount_release(&pr->pr_uref);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Complete a call to either prison_free or prison_proc_free.
|
|
*/
|
|
static void
|
|
prison_complete(void *context, int pending)
|
|
{
|
|
struct prison *pr = context;
|
|
int drflags;
|
|
|
|
/*
|
|
* This could be called to release the last reference, or the last
|
|
* user reference (plus the reference held in prison_proc_free).
|
|
*/
|
|
drflags = prison_lock_xlock(pr, PD_DEREF);
|
|
if (pr->pr_flags & PR_COMPLETE_PROC) {
|
|
pr->pr_flags &= ~PR_COMPLETE_PROC;
|
|
drflags |= PD_DEUREF;
|
|
}
|
|
prison_deref(pr, drflags);
|
|
}
|
|
|
|
/*
|
|
* Remove a prison reference and/or user reference (usually).
|
|
* This assumes context that allows sleeping (for allprison_lock),
|
|
* with no non-sleeping locks held, except perhaps the prison itself.
|
|
* If there are no more references, release and delist the prison.
|
|
* On completion, the prison lock and the allprison lock are both
|
|
* unlocked.
|
|
*/
|
|
static void
|
|
prison_deref(struct prison *pr, int flags)
|
|
{
|
|
struct prisonlist freeprison;
|
|
struct prison *killpr, *rpr, *ppr, *tpr;
|
|
struct proc *p;
|
|
|
|
killpr = NULL;
|
|
TAILQ_INIT(&freeprison);
|
|
/*
|
|
* Release this prison as requested, which may cause its parent
|
|
* to be released, and then maybe its grandparent, etc.
|
|
*/
|
|
for (;;) {
|
|
if (flags & PD_KILL) {
|
|
/* Kill the prison and its descendents. */
|
|
KASSERT(pr != &prison0,
|
|
("prison_deref trying to kill prison0"));
|
|
if (!(flags & PD_DEREF)) {
|
|
prison_hold(pr);
|
|
flags |= PD_DEREF;
|
|
}
|
|
flags = prison_lock_xlock(pr, flags);
|
|
prison_deref_kill(pr, &freeprison);
|
|
}
|
|
if (flags & PD_DEUREF) {
|
|
/* Drop a user reference. */
|
|
KASSERT(refcount_load(&pr->pr_uref) > 0,
|
|
("prison_deref PD_DEUREF on a dead prison (jid=%d)",
|
|
pr->pr_id));
|
|
if (!refcount_release_if_not_last(&pr->pr_uref)) {
|
|
if (!(flags & PD_DEREF)) {
|
|
prison_hold(pr);
|
|
flags |= PD_DEREF;
|
|
}
|
|
flags = prison_lock_xlock(pr, flags);
|
|
if (refcount_release(&pr->pr_uref) &&
|
|
pr->pr_state == PRISON_STATE_ALIVE) {
|
|
/*
|
|
* When the last user references goes,
|
|
* this becomes a dying prison.
|
|
*/
|
|
KASSERT(
|
|
refcount_load(&prison0.pr_uref) > 0,
|
|
("prison0 pr_uref=0"));
|
|
pr->pr_state = PRISON_STATE_DYING;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
flags &= ~PD_LOCKED;
|
|
(void)osd_jail_call(pr,
|
|
PR_METHOD_REMOVE, NULL);
|
|
}
|
|
}
|
|
}
|
|
if (flags & PD_KILL) {
|
|
/*
|
|
* Any remaining user references are probably processes
|
|
* that need to be killed, either in this prison or its
|
|
* descendants.
|
|
*/
|
|
if (refcount_load(&pr->pr_uref) > 0)
|
|
killpr = pr;
|
|
/* Make sure the parent prison doesn't get killed. */
|
|
flags &= ~PD_KILL;
|
|
}
|
|
if (flags & PD_DEREF) {
|
|
/* Drop a reference. */
|
|
KASSERT(refcount_load(&pr->pr_ref) > 0,
|
|
("prison_deref PD_DEREF on a dead prison (jid=%d)",
|
|
pr->pr_id));
|
|
if (!refcount_release_if_not_last(&pr->pr_ref)) {
|
|
flags = prison_lock_xlock(pr, flags);
|
|
if (refcount_release(&pr->pr_ref)) {
|
|
/*
|
|
* When the last reference goes,
|
|
* unlink the prison and set it aside.
|
|
*/
|
|
KASSERT(
|
|
refcount_load(&pr->pr_uref) == 0,
|
|
("prison_deref: last ref, "
|
|
"but still has %d urefs (jid=%d)",
|
|
pr->pr_uref, pr->pr_id));
|
|
KASSERT(
|
|
refcount_load(&prison0.pr_ref) != 0,
|
|
("prison0 pr_ref=0"));
|
|
pr->pr_state = PRISON_STATE_INVALID;
|
|
TAILQ_REMOVE(&allprison, pr, pr_list);
|
|
LIST_REMOVE(pr, pr_sibling);
|
|
TAILQ_INSERT_TAIL(&freeprison, pr,
|
|
pr_list);
|
|
for (ppr = pr->pr_parent;
|
|
ppr != NULL;
|
|
ppr = ppr->pr_parent)
|
|
ppr->pr_childcount--;
|
|
/*
|
|
* Removing a prison frees references
|
|
* from its parent.
|
|
*/
|
|
mtx_unlock(&pr->pr_mtx);
|
|
flags &= ~PD_LOCKED;
|
|
pr = pr->pr_parent;
|
|
flags |= PD_DEREF | PD_DEUREF;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Release all the prison locks. */
|
|
if (flags & PD_LOCKED)
|
|
mtx_unlock(&pr->pr_mtx);
|
|
if (flags & PD_LIST_SLOCKED)
|
|
sx_sunlock(&allprison_lock);
|
|
else if (flags & PD_LIST_XLOCKED)
|
|
sx_xunlock(&allprison_lock);
|
|
|
|
/* Kill any processes attached to a killed prison. */
|
|
if (killpr != NULL) {
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
PROC_LOCK(p);
|
|
if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
|
|
for (ppr = p->p_ucred->cr_prison;
|
|
ppr != &prison0;
|
|
ppr = ppr->pr_parent)
|
|
if (ppr == killpr) {
|
|
kern_psignal(p, SIGKILL);
|
|
break;
|
|
}
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
}
|
|
|
|
/*
|
|
* Finish removing any unreferenced prisons, which couldn't happen
|
|
* while allprison_lock was held (to avoid a LOR on vrele).
|
|
*/
|
|
TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
|
|
#ifdef VIMAGE
|
|
if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
|
|
vnet_destroy(rpr->pr_vnet);
|
|
#endif
|
|
if (rpr->pr_root != NULL)
|
|
vrele(rpr->pr_root);
|
|
mtx_destroy(&rpr->pr_mtx);
|
|
#ifdef INET
|
|
free(rpr->pr_ip4, M_PRISON);
|
|
#endif
|
|
#ifdef INET6
|
|
free(rpr->pr_ip6, M_PRISON);
|
|
#endif
|
|
if (rpr->pr_cpuset != NULL)
|
|
cpuset_rel(rpr->pr_cpuset);
|
|
osd_jail_exit(rpr);
|
|
#ifdef RACCT
|
|
if (racct_enable)
|
|
prison_racct_detach(rpr);
|
|
#endif
|
|
TAILQ_REMOVE(&freeprison, rpr, pr_list);
|
|
free(rpr, M_PRISON);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Kill the prison and its descendants. Mark them as dying, clear the
|
|
* persist flag, and call module remove methods.
|
|
*/
|
|
static void
|
|
prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
|
|
{
|
|
struct prison *cpr, *ppr, *rpr;
|
|
bool descend;
|
|
|
|
/*
|
|
* Unlike the descendants, the target prison can be killed
|
|
* even if it is currently dying. This is useful for failed
|
|
* creation in jail_set(2).
|
|
*/
|
|
KASSERT(refcount_load(&pr->pr_ref) > 0,
|
|
("Trying to kill dead prison %p (jid=%d).",
|
|
pr, pr->pr_id));
|
|
refcount_acquire(&pr->pr_uref);
|
|
pr->pr_state = PRISON_STATE_DYING;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
rpr = NULL;
|
|
FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
|
|
if (descend) {
|
|
if (!prison_isalive(cpr)) {
|
|
descend = false;
|
|
continue;
|
|
}
|
|
prison_hold(cpr);
|
|
prison_proc_hold(cpr);
|
|
mtx_lock(&cpr->pr_mtx);
|
|
cpr->pr_state = PRISON_STATE_DYING;
|
|
cpr->pr_flags |= PR_REMOVE;
|
|
mtx_unlock(&cpr->pr_mtx);
|
|
continue;
|
|
}
|
|
if (!(cpr->pr_flags & PR_REMOVE))
|
|
continue;
|
|
(void)osd_jail_call(cpr, PR_METHOD_REMOVE, NULL);
|
|
mtx_lock(&cpr->pr_mtx);
|
|
cpr->pr_flags &= ~PR_REMOVE;
|
|
if (cpr->pr_flags & PR_PERSIST) {
|
|
cpr->pr_flags &= ~PR_PERSIST;
|
|
prison_proc_free_not_last(cpr);
|
|
prison_free_not_last(cpr);
|
|
}
|
|
(void)refcount_release(&cpr->pr_uref);
|
|
if (refcount_release(&cpr->pr_ref)) {
|
|
/*
|
|
* When the last reference goes, unlink the prison
|
|
* and set it aside for prison_deref() to handle.
|
|
* Delay unlinking the sibling list to keep the loop
|
|
* safe.
|
|
*/
|
|
if (rpr != NULL)
|
|
LIST_REMOVE(rpr, pr_sibling);
|
|
rpr = cpr;
|
|
rpr->pr_state = PRISON_STATE_INVALID;
|
|
TAILQ_REMOVE(&allprison, rpr, pr_list);
|
|
TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
|
|
/*
|
|
* Removing a prison frees references from its parent.
|
|
*/
|
|
ppr = rpr->pr_parent;
|
|
prison_proc_free_not_last(ppr);
|
|
prison_free_not_last(ppr);
|
|
for (; ppr != NULL; ppr = ppr->pr_parent)
|
|
ppr->pr_childcount--;
|
|
}
|
|
mtx_unlock(&cpr->pr_mtx);
|
|
}
|
|
if (rpr != NULL)
|
|
LIST_REMOVE(rpr, pr_sibling);
|
|
|
|
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_flags & PR_PERSIST) {
|
|
pr->pr_flags &= ~PR_PERSIST;
|
|
prison_proc_free_not_last(pr);
|
|
prison_free_not_last(pr);
|
|
}
|
|
(void)refcount_release(&pr->pr_uref);
|
|
}
|
|
|
|
/*
|
|
* Given the current locking state in the flags, make sure allprison_lock
|
|
* is held exclusive, and the prison is locked. Return flags indicating
|
|
* the new state.
|
|
*/
|
|
static int
|
|
prison_lock_xlock(struct prison *pr, int flags)
|
|
{
|
|
|
|
if (!(flags & PD_LIST_XLOCKED)) {
|
|
/*
|
|
* Get allprison_lock, which may be an upgrade,
|
|
* and may require unlocking the prison.
|
|
*/
|
|
if (flags & PD_LOCKED) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
flags &= ~PD_LOCKED;
|
|
}
|
|
if (flags & PD_LIST_SLOCKED) {
|
|
if (!sx_try_upgrade(&allprison_lock)) {
|
|
sx_sunlock(&allprison_lock);
|
|
sx_xlock(&allprison_lock);
|
|
}
|
|
flags &= ~PD_LIST_SLOCKED;
|
|
} else
|
|
sx_xlock(&allprison_lock);
|
|
flags |= PD_LIST_XLOCKED;
|
|
}
|
|
if (!(flags & PD_LOCKED)) {
|
|
/* Lock the prison mutex. */
|
|
mtx_lock(&pr->pr_mtx);
|
|
flags |= PD_LOCKED;
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
/*
|
|
* Set or clear a permission bit in the pr_allow field, passing restrictions
|
|
* (cleared permission) down to child jails.
|
|
*/
|
|
void
|
|
prison_set_allow(struct ucred *cred, unsigned flag, int enable)
|
|
{
|
|
struct prison *pr;
|
|
|
|
pr = cred->cr_prison;
|
|
sx_slock(&allprison_lock);
|
|
mtx_lock(&pr->pr_mtx);
|
|
prison_set_allow_locked(pr, flag, enable);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
sx_sunlock(&allprison_lock);
|
|
}
|
|
|
|
static void
|
|
prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
|
|
{
|
|
struct prison *cpr;
|
|
int descend;
|
|
|
|
if (enable != 0)
|
|
pr->pr_allow |= flag;
|
|
else {
|
|
pr->pr_allow &= ~flag;
|
|
FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
|
|
cpr->pr_allow &= ~flag;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if a jail supports the given address family.
|
|
*
|
|
* Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
|
|
* if not.
|
|
*/
|
|
int
|
|
prison_check_af(struct ucred *cred, int af)
|
|
{
|
|
struct prison *pr;
|
|
int error;
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
|
|
pr = cred->cr_prison;
|
|
#ifdef VIMAGE
|
|
/* Prisons with their own network stack are not limited. */
|
|
if (prison_owns_vnet(cred))
|
|
return (0);
|
|
#endif
|
|
|
|
error = 0;
|
|
switch (af)
|
|
{
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if (pr->pr_flags & PR_IP4)
|
|
{
|
|
mtx_lock(&pr->pr_mtx);
|
|
if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
|
|
error = EAFNOSUPPORT;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (pr->pr_flags & PR_IP6)
|
|
{
|
|
mtx_lock(&pr->pr_mtx);
|
|
if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
|
|
error = EAFNOSUPPORT;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
break;
|
|
#endif
|
|
case AF_LOCAL:
|
|
case AF_ROUTE:
|
|
break;
|
|
default:
|
|
if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
|
|
error = EAFNOSUPPORT;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check if given address belongs to the jail referenced by cred (wrapper to
|
|
* prison_check_ip[46]).
|
|
*
|
|
* Returns 0 if jail doesn't restrict the address family or if address belongs
|
|
* to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
|
|
* the jail doesn't allow the address family. IPv4 Address passed in in NBO.
|
|
*/
|
|
int
|
|
prison_if(struct ucred *cred, const struct sockaddr *sa)
|
|
{
|
|
#ifdef INET
|
|
const struct sockaddr_in *sai;
|
|
#endif
|
|
#ifdef INET6
|
|
const struct sockaddr_in6 *sai6;
|
|
#endif
|
|
int error;
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
|
|
|
|
#ifdef VIMAGE
|
|
if (prison_owns_vnet(cred))
|
|
return (0);
|
|
#endif
|
|
|
|
error = 0;
|
|
switch (sa->sa_family)
|
|
{
|
|
#ifdef INET
|
|
case AF_INET:
|
|
sai = (const struct sockaddr_in *)sa;
|
|
error = prison_check_ip4(cred, &sai->sin_addr);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
sai6 = (const struct sockaddr_in6 *)sa;
|
|
error = prison_check_ip6(cred, &sai6->sin6_addr);
|
|
break;
|
|
#endif
|
|
default:
|
|
if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
|
|
error = EAFNOSUPPORT;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
|
|
*/
|
|
int
|
|
prison_check(struct ucred *cred1, struct ucred *cred2)
|
|
{
|
|
|
|
return ((cred1->cr_prison == cred2->cr_prison ||
|
|
prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if p2 is a child of p1, otherwise 0.
|
|
*/
|
|
int
|
|
prison_ischild(struct prison *pr1, struct prison *pr2)
|
|
{
|
|
|
|
for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
|
|
if (pr1 == pr2)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return true if the prison is currently alive. A prison is alive if it
|
|
* holds user references and it isn't being removed.
|
|
*/
|
|
bool
|
|
prison_isalive(struct prison *pr)
|
|
{
|
|
|
|
if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
|
|
return (false);
|
|
return (true);
|
|
}
|
|
|
|
/*
|
|
* Return true if the prison is currently valid. A prison is valid if it has
|
|
* been fully created, and is not being destroyed. Note that dying prisons
|
|
* are still considered valid. Invalid prisons won't be found under normal
|
|
* circumstances, as they're only put in that state by functions that have
|
|
* an exclusive hold on allprison_lock.
|
|
*/
|
|
bool
|
|
prison_isvalid(struct prison *pr)
|
|
{
|
|
|
|
if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
|
|
return (false);
|
|
if (__predict_false(refcount_load(&pr->pr_ref) == 0))
|
|
return (false);
|
|
return (true);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the passed credential is in a jail and that jail does not
|
|
* have its own virtual network stack, otherwise 0.
|
|
*/
|
|
int
|
|
jailed_without_vnet(struct ucred *cred)
|
|
{
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
#ifdef VIMAGE
|
|
if (prison_owns_vnet(cred))
|
|
return (0);
|
|
#endif
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Return the correct hostname (domainname, et al) for the passed credential.
|
|
*/
|
|
void
|
|
getcredhostname(struct ucred *cred, char *buf, size_t size)
|
|
{
|
|
struct prison *pr;
|
|
|
|
/*
|
|
* A NULL credential can be used to shortcut to the physical
|
|
* system's hostname.
|
|
*/
|
|
pr = (cred != NULL) ? cred->cr_prison : &prison0;
|
|
mtx_lock(&pr->pr_mtx);
|
|
strlcpy(buf, pr->pr_hostname, size);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
void
|
|
getcreddomainname(struct ucred *cred, char *buf, size_t size)
|
|
{
|
|
|
|
mtx_lock(&cred->cr_prison->pr_mtx);
|
|
strlcpy(buf, cred->cr_prison->pr_domainname, size);
|
|
mtx_unlock(&cred->cr_prison->pr_mtx);
|
|
}
|
|
|
|
void
|
|
getcredhostuuid(struct ucred *cred, char *buf, size_t size)
|
|
{
|
|
|
|
mtx_lock(&cred->cr_prison->pr_mtx);
|
|
strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
|
|
mtx_unlock(&cred->cr_prison->pr_mtx);
|
|
}
|
|
|
|
void
|
|
getcredhostid(struct ucred *cred, unsigned long *hostid)
|
|
{
|
|
|
|
mtx_lock(&cred->cr_prison->pr_mtx);
|
|
*hostid = cred->cr_prison->pr_hostid;
|
|
mtx_unlock(&cred->cr_prison->pr_mtx);
|
|
}
|
|
|
|
void
|
|
getjailname(struct ucred *cred, char *name, size_t len)
|
|
{
|
|
|
|
mtx_lock(&cred->cr_prison->pr_mtx);
|
|
strlcpy(name, cred->cr_prison->pr_name, len);
|
|
mtx_unlock(&cred->cr_prison->pr_mtx);
|
|
}
|
|
|
|
#ifdef VIMAGE
|
|
/*
|
|
* Determine whether the prison represented by cred owns
|
|
* its vnet rather than having it inherited.
|
|
*
|
|
* Returns 1 in case the prison owns the vnet, 0 otherwise.
|
|
*/
|
|
int
|
|
prison_owns_vnet(struct ucred *cred)
|
|
{
|
|
|
|
/*
|
|
* vnets cannot be added/removed after jail creation,
|
|
* so no need to lock here.
|
|
*/
|
|
return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Determine whether the subject represented by cred can "see"
|
|
* status of a mount point.
|
|
* Returns: 0 for permitted, ENOENT otherwise.
|
|
* XXX: This function should be called cr_canseemount() and should be
|
|
* placed in kern_prot.c.
|
|
*/
|
|
int
|
|
prison_canseemount(struct ucred *cred, struct mount *mp)
|
|
{
|
|
struct prison *pr;
|
|
struct statfs *sp;
|
|
size_t len;
|
|
|
|
pr = cred->cr_prison;
|
|
if (pr->pr_enforce_statfs == 0)
|
|
return (0);
|
|
if (pr->pr_root->v_mount == mp)
|
|
return (0);
|
|
if (pr->pr_enforce_statfs == 2)
|
|
return (ENOENT);
|
|
/*
|
|
* If jail's chroot directory is set to "/" we should be able to see
|
|
* all mount-points from inside a jail.
|
|
* This is ugly check, but this is the only situation when jail's
|
|
* directory ends with '/'.
|
|
*/
|
|
if (strcmp(pr->pr_path, "/") == 0)
|
|
return (0);
|
|
len = strlen(pr->pr_path);
|
|
sp = &mp->mnt_stat;
|
|
if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
|
|
return (ENOENT);
|
|
/*
|
|
* Be sure that we don't have situation where jail's root directory
|
|
* is "/some/path" and mount point is "/some/pathpath".
|
|
*/
|
|
if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
|
|
return (ENOENT);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
|
|
{
|
|
char jpath[MAXPATHLEN];
|
|
struct prison *pr;
|
|
size_t len;
|
|
|
|
pr = cred->cr_prison;
|
|
if (pr->pr_enforce_statfs == 0)
|
|
return;
|
|
if (prison_canseemount(cred, mp) != 0) {
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
strlcpy(sp->f_mntonname, "[restricted]",
|
|
sizeof(sp->f_mntonname));
|
|
return;
|
|
}
|
|
if (pr->pr_root->v_mount == mp) {
|
|
/*
|
|
* Clear current buffer data, so we are sure nothing from
|
|
* the valid path left there.
|
|
*/
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
*sp->f_mntonname = '/';
|
|
return;
|
|
}
|
|
/*
|
|
* If jail's chroot directory is set to "/" we should be able to see
|
|
* all mount-points from inside a jail.
|
|
*/
|
|
if (strcmp(pr->pr_path, "/") == 0)
|
|
return;
|
|
len = strlen(pr->pr_path);
|
|
strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
|
|
/*
|
|
* Clear current buffer data, so we are sure nothing from
|
|
* the valid path left there.
|
|
*/
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
if (*jpath == '\0') {
|
|
/* Should never happen. */
|
|
*sp->f_mntonname = '/';
|
|
} else {
|
|
strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check with permission for a specific privilege is granted within jail. We
|
|
* have a specific list of accepted privileges; the rest are denied.
|
|
*/
|
|
int
|
|
prison_priv_check(struct ucred *cred, int priv)
|
|
{
|
|
struct prison *pr;
|
|
int error;
|
|
|
|
/*
|
|
* Some policies have custom handlers. This routine should not be
|
|
* called for them. See priv_check_cred().
|
|
*/
|
|
switch (priv) {
|
|
case PRIV_VFS_LOOKUP:
|
|
case PRIV_VFS_GENERATION:
|
|
KASSERT(0, ("prison_priv_check instead of a custom handler "
|
|
"called for %d\n", priv));
|
|
}
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
|
|
#ifdef VIMAGE
|
|
/*
|
|
* Privileges specific to prisons with a virtual network stack.
|
|
* There might be a duplicate entry here in case the privilege
|
|
* is only granted conditionally in the legacy jail case.
|
|
*/
|
|
switch (priv) {
|
|
#ifdef notyet
|
|
/*
|
|
* NFS-specific privileges.
|
|
*/
|
|
case PRIV_NFS_DAEMON:
|
|
case PRIV_NFS_LOCKD:
|
|
#endif
|
|
/*
|
|
* Network stack privileges.
|
|
*/
|
|
case PRIV_NET_BRIDGE:
|
|
case PRIV_NET_GRE:
|
|
case PRIV_NET_BPF:
|
|
case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
|
|
case PRIV_NET_ROUTE:
|
|
case PRIV_NET_TAP:
|
|
case PRIV_NET_SETIFMTU:
|
|
case PRIV_NET_SETIFFLAGS:
|
|
case PRIV_NET_SETIFCAP:
|
|
case PRIV_NET_SETIFDESCR:
|
|
case PRIV_NET_SETIFNAME :
|
|
case PRIV_NET_SETIFMETRIC:
|
|
case PRIV_NET_SETIFPHYS:
|
|
case PRIV_NET_SETIFMAC:
|
|
case PRIV_NET_SETLANPCP:
|
|
case PRIV_NET_ADDMULTI:
|
|
case PRIV_NET_DELMULTI:
|
|
case PRIV_NET_HWIOCTL:
|
|
case PRIV_NET_SETLLADDR:
|
|
case PRIV_NET_ADDIFGROUP:
|
|
case PRIV_NET_DELIFGROUP:
|
|
case PRIV_NET_IFCREATE:
|
|
case PRIV_NET_IFDESTROY:
|
|
case PRIV_NET_ADDIFADDR:
|
|
case PRIV_NET_DELIFADDR:
|
|
case PRIV_NET_LAGG:
|
|
case PRIV_NET_GIF:
|
|
case PRIV_NET_SETIFVNET:
|
|
case PRIV_NET_SETIFFIB:
|
|
|
|
/*
|
|
* 802.11-related privileges.
|
|
*/
|
|
case PRIV_NET80211_VAP_GETKEY:
|
|
case PRIV_NET80211_VAP_MANAGE:
|
|
|
|
#ifdef notyet
|
|
/*
|
|
* ATM privileges.
|
|
*/
|
|
case PRIV_NETATM_CFG:
|
|
case PRIV_NETATM_ADD:
|
|
case PRIV_NETATM_DEL:
|
|
case PRIV_NETATM_SET:
|
|
|
|
/*
|
|
* Bluetooth privileges.
|
|
*/
|
|
case PRIV_NETBLUETOOTH_RAW:
|
|
#endif
|
|
|
|
/*
|
|
* Netgraph and netgraph module privileges.
|
|
*/
|
|
case PRIV_NETGRAPH_CONTROL:
|
|
#ifdef notyet
|
|
case PRIV_NETGRAPH_TTY:
|
|
#endif
|
|
|
|
/*
|
|
* IPv4 and IPv6 privileges.
|
|
*/
|
|
case PRIV_NETINET_IPFW:
|
|
case PRIV_NETINET_DIVERT:
|
|
case PRIV_NETINET_PF:
|
|
case PRIV_NETINET_DUMMYNET:
|
|
case PRIV_NETINET_CARP:
|
|
case PRIV_NETINET_MROUTE:
|
|
case PRIV_NETINET_RAW:
|
|
case PRIV_NETINET_ADDRCTRL6:
|
|
case PRIV_NETINET_ND6:
|
|
case PRIV_NETINET_SCOPE6:
|
|
case PRIV_NETINET_ALIFETIME6:
|
|
case PRIV_NETINET_IPSEC:
|
|
case PRIV_NETINET_BINDANY:
|
|
|
|
#ifdef notyet
|
|
/*
|
|
* NCP privileges.
|
|
*/
|
|
case PRIV_NETNCP:
|
|
|
|
/*
|
|
* SMB privileges.
|
|
*/
|
|
case PRIV_NETSMB:
|
|
#endif
|
|
|
|
/*
|
|
* No default: or deny here.
|
|
* In case of no permit fall through to next switch().
|
|
*/
|
|
if (cred->cr_prison->pr_flags & PR_VNET)
|
|
return (0);
|
|
}
|
|
#endif /* VIMAGE */
|
|
|
|
switch (priv) {
|
|
/*
|
|
* Allow ktrace privileges for root in jail.
|
|
*/
|
|
case PRIV_KTRACE:
|
|
|
|
#if 0
|
|
/*
|
|
* Allow jailed processes to configure audit identity and
|
|
* submit audit records (login, etc). In the future we may
|
|
* want to further refine the relationship between audit and
|
|
* jail.
|
|
*/
|
|
case PRIV_AUDIT_GETAUDIT:
|
|
case PRIV_AUDIT_SETAUDIT:
|
|
case PRIV_AUDIT_SUBMIT:
|
|
#endif
|
|
|
|
/*
|
|
* Allow jailed processes to manipulate process UNIX
|
|
* credentials in any way they see fit.
|
|
*/
|
|
case PRIV_CRED_SETUID:
|
|
case PRIV_CRED_SETEUID:
|
|
case PRIV_CRED_SETGID:
|
|
case PRIV_CRED_SETEGID:
|
|
case PRIV_CRED_SETGROUPS:
|
|
case PRIV_CRED_SETREUID:
|
|
case PRIV_CRED_SETREGID:
|
|
case PRIV_CRED_SETRESUID:
|
|
case PRIV_CRED_SETRESGID:
|
|
|
|
/*
|
|
* Jail implements visibility constraints already, so allow
|
|
* jailed root to override uid/gid-based constraints.
|
|
*/
|
|
case PRIV_SEEOTHERGIDS:
|
|
case PRIV_SEEOTHERUIDS:
|
|
|
|
/*
|
|
* Jail implements inter-process debugging limits already, so
|
|
* allow jailed root various debugging privileges.
|
|
*/
|
|
case PRIV_DEBUG_DIFFCRED:
|
|
case PRIV_DEBUG_SUGID:
|
|
case PRIV_DEBUG_UNPRIV:
|
|
|
|
/*
|
|
* Allow jail to set various resource limits and login
|
|
* properties, and for now, exceed process resource limits.
|
|
*/
|
|
case PRIV_PROC_LIMIT:
|
|
case PRIV_PROC_SETLOGIN:
|
|
case PRIV_PROC_SETRLIMIT:
|
|
|
|
/*
|
|
* System V and POSIX IPC privileges are granted in jail.
|
|
*/
|
|
case PRIV_IPC_READ:
|
|
case PRIV_IPC_WRITE:
|
|
case PRIV_IPC_ADMIN:
|
|
case PRIV_IPC_MSGSIZE:
|
|
case PRIV_MQ_ADMIN:
|
|
|
|
/*
|
|
* Jail operations within a jail work on child jails.
|
|
*/
|
|
case PRIV_JAIL_ATTACH:
|
|
case PRIV_JAIL_SET:
|
|
case PRIV_JAIL_REMOVE:
|
|
|
|
/*
|
|
* Jail implements its own inter-process limits, so allow
|
|
* root processes in jail to change scheduling on other
|
|
* processes in the same jail. Likewise for signalling.
|
|
*/
|
|
case PRIV_SCHED_DIFFCRED:
|
|
case PRIV_SCHED_CPUSET:
|
|
case PRIV_SIGNAL_DIFFCRED:
|
|
case PRIV_SIGNAL_SUGID:
|
|
|
|
/*
|
|
* Allow jailed processes to write to sysctls marked as jail
|
|
* writable.
|
|
*/
|
|
case PRIV_SYSCTL_WRITEJAIL:
|
|
|
|
/*
|
|
* Allow root in jail to manage a variety of quota
|
|
* properties. These should likely be conditional on a
|
|
* configuration option.
|
|
*/
|
|
case PRIV_VFS_GETQUOTA:
|
|
case PRIV_VFS_SETQUOTA:
|
|
|
|
/*
|
|
* Since Jail relies on chroot() to implement file system
|
|
* protections, grant many VFS privileges to root in jail.
|
|
* Be careful to exclude mount-related and NFS-related
|
|
* privileges.
|
|
*/
|
|
case PRIV_VFS_READ:
|
|
case PRIV_VFS_WRITE:
|
|
case PRIV_VFS_ADMIN:
|
|
case PRIV_VFS_EXEC:
|
|
case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
|
|
case PRIV_VFS_CHFLAGS_DEV:
|
|
case PRIV_VFS_CHOWN:
|
|
case PRIV_VFS_CHROOT:
|
|
case PRIV_VFS_RETAINSUGID:
|
|
case PRIV_VFS_FCHROOT:
|
|
case PRIV_VFS_LINK:
|
|
case PRIV_VFS_SETGID:
|
|
case PRIV_VFS_STAT:
|
|
case PRIV_VFS_STICKYFILE:
|
|
|
|
/*
|
|
* As in the non-jail case, non-root users are expected to be
|
|
* able to read kernel/physical memory (provided /dev/[k]mem
|
|
* exists in the jail and they have permission to access it).
|
|
*/
|
|
case PRIV_KMEM_READ:
|
|
return (0);
|
|
|
|
/*
|
|
* Depending on the global setting, allow privilege of
|
|
* setting system flags.
|
|
*/
|
|
case PRIV_VFS_SYSFLAGS:
|
|
if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Depending on the global setting, allow privilege of
|
|
* mounting/unmounting file systems.
|
|
*/
|
|
case PRIV_VFS_MOUNT:
|
|
case PRIV_VFS_UNMOUNT:
|
|
case PRIV_VFS_MOUNT_NONUSER:
|
|
case PRIV_VFS_MOUNT_OWNER:
|
|
pr = cred->cr_prison;
|
|
prison_lock(pr);
|
|
if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
|
|
error = 0;
|
|
else
|
|
error = EPERM;
|
|
prison_unlock(pr);
|
|
return (error);
|
|
|
|
/*
|
|
* Jails should hold no disposition on the PRIV_VFS_READ_DIR
|
|
* policy. priv_check_cred will not specifically allow it, and
|
|
* we may want a MAC policy to allow it.
|
|
*/
|
|
case PRIV_VFS_READ_DIR:
|
|
return (0);
|
|
|
|
/*
|
|
* Conditionnaly allow locking (unlocking) physical pages
|
|
* in memory.
|
|
*/
|
|
case PRIV_VM_MLOCK:
|
|
case PRIV_VM_MUNLOCK:
|
|
if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Conditionally allow jailed root to bind reserved ports.
|
|
*/
|
|
case PRIV_NETINET_RESERVEDPORT:
|
|
if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Allow jailed root to reuse in-use ports.
|
|
*/
|
|
case PRIV_NETINET_REUSEPORT:
|
|
return (0);
|
|
|
|
/*
|
|
* Allow jailed root to set certain IPv4/6 (option) headers.
|
|
*/
|
|
case PRIV_NETINET_SETHDROPTS:
|
|
return (0);
|
|
|
|
/*
|
|
* Conditionally allow creating raw sockets in jail.
|
|
*/
|
|
case PRIV_NETINET_RAW:
|
|
if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Since jail implements its own visibility limits on netstat
|
|
* sysctls, allow getcred. This allows identd to work in
|
|
* jail.
|
|
*/
|
|
case PRIV_NETINET_GETCRED:
|
|
return (0);
|
|
|
|
/*
|
|
* Allow jailed root to set loginclass.
|
|
*/
|
|
case PRIV_PROC_SETLOGINCLASS:
|
|
return (0);
|
|
|
|
/*
|
|
* Do not allow a process inside a jail to read the kernel
|
|
* message buffer unless explicitly permitted.
|
|
*/
|
|
case PRIV_MSGBUF:
|
|
if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
|
|
return (0);
|
|
return (EPERM);
|
|
|
|
default:
|
|
/*
|
|
* In all remaining cases, deny the privilege request. This
|
|
* includes almost all network privileges, many system
|
|
* configuration privileges.
|
|
*/
|
|
return (EPERM);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the part of pr2's name that is relative to pr1, or the whole name
|
|
* if it does not directly follow.
|
|
*/
|
|
|
|
char *
|
|
prison_name(struct prison *pr1, struct prison *pr2)
|
|
{
|
|
char *name;
|
|
|
|
/* Jails see themselves as "0" (if they see themselves at all). */
|
|
if (pr1 == pr2)
|
|
return "0";
|
|
name = pr2->pr_name;
|
|
if (prison_ischild(pr1, pr2)) {
|
|
/*
|
|
* pr1 isn't locked (and allprison_lock may not be either)
|
|
* so its length can't be counted on. But the number of dots
|
|
* can be counted on - and counted.
|
|
*/
|
|
for (; pr1 != &prison0; pr1 = pr1->pr_parent)
|
|
name = strchr(name, '.') + 1;
|
|
}
|
|
return (name);
|
|
}
|
|
|
|
/*
|
|
* Return the part of pr2's path that is relative to pr1, or the whole path
|
|
* if it does not directly follow.
|
|
*/
|
|
static char *
|
|
prison_path(struct prison *pr1, struct prison *pr2)
|
|
{
|
|
char *path1, *path2;
|
|
int len1;
|
|
|
|
path1 = pr1->pr_path;
|
|
path2 = pr2->pr_path;
|
|
if (!strcmp(path1, "/"))
|
|
return (path2);
|
|
len1 = strlen(path1);
|
|
if (strncmp(path1, path2, len1))
|
|
return (path2);
|
|
if (path2[len1] == '\0')
|
|
return "/";
|
|
if (path2[len1] == '/')
|
|
return (path2 + len1);
|
|
return (path2);
|
|
}
|
|
|
|
/*
|
|
* Jail-related sysctls.
|
|
*/
|
|
static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
|
|
"Jails");
|
|
|
|
static int
|
|
sysctl_jail_list(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xprison *xp;
|
|
struct prison *pr, *cpr;
|
|
#ifdef INET
|
|
struct in_addr *ip4 = NULL;
|
|
int ip4s = 0;
|
|
#endif
|
|
#ifdef INET6
|
|
struct in6_addr *ip6 = NULL;
|
|
int ip6s = 0;
|
|
#endif
|
|
int descend, error;
|
|
|
|
xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
|
|
pr = req->td->td_ucred->cr_prison;
|
|
error = 0;
|
|
sx_slock(&allprison_lock);
|
|
FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
|
|
#if defined(INET) || defined(INET6)
|
|
again:
|
|
#endif
|
|
mtx_lock(&cpr->pr_mtx);
|
|
#ifdef INET
|
|
if (cpr->pr_ip4s > 0) {
|
|
if (ip4s < cpr->pr_ip4s) {
|
|
ip4s = cpr->pr_ip4s;
|
|
mtx_unlock(&cpr->pr_mtx);
|
|
ip4 = realloc(ip4, ip4s *
|
|
sizeof(struct in_addr), M_TEMP, M_WAITOK);
|
|
goto again;
|
|
}
|
|
bcopy(cpr->pr_ip4, ip4,
|
|
cpr->pr_ip4s * sizeof(struct in_addr));
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (cpr->pr_ip6s > 0) {
|
|
if (ip6s < cpr->pr_ip6s) {
|
|
ip6s = cpr->pr_ip6s;
|
|
mtx_unlock(&cpr->pr_mtx);
|
|
ip6 = realloc(ip6, ip6s *
|
|
sizeof(struct in6_addr), M_TEMP, M_WAITOK);
|
|
goto again;
|
|
}
|
|
bcopy(cpr->pr_ip6, ip6,
|
|
cpr->pr_ip6s * sizeof(struct in6_addr));
|
|
}
|
|
#endif
|
|
bzero(xp, sizeof(*xp));
|
|
xp->pr_version = XPRISON_VERSION;
|
|
xp->pr_id = cpr->pr_id;
|
|
xp->pr_state = cpr->pr_state;
|
|
strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
|
|
strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
|
|
strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
|
|
#ifdef INET
|
|
xp->pr_ip4s = cpr->pr_ip4s;
|
|
#endif
|
|
#ifdef INET6
|
|
xp->pr_ip6s = cpr->pr_ip6s;
|
|
#endif
|
|
mtx_unlock(&cpr->pr_mtx);
|
|
error = SYSCTL_OUT(req, xp, sizeof(*xp));
|
|
if (error)
|
|
break;
|
|
#ifdef INET
|
|
if (xp->pr_ip4s > 0) {
|
|
error = SYSCTL_OUT(req, ip4,
|
|
xp->pr_ip4s * sizeof(struct in_addr));
|
|
if (error)
|
|
break;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (xp->pr_ip6s > 0) {
|
|
error = SYSCTL_OUT(req, ip6,
|
|
xp->pr_ip6s * sizeof(struct in6_addr));
|
|
if (error)
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
sx_sunlock(&allprison_lock);
|
|
free(xp, M_TEMP);
|
|
#ifdef INET
|
|
free(ip4, M_TEMP);
|
|
#endif
|
|
#ifdef INET6
|
|
free(ip6, M_TEMP);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_OID(_security_jail, OID_AUTO, list,
|
|
CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
|
|
sysctl_jail_list, "S", "List of active jails");
|
|
|
|
static int
|
|
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, injail;
|
|
|
|
injail = jailed(req->td->td_ucred);
|
|
error = SYSCTL_OUT(req, &injail, sizeof(injail));
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
|
|
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
|
|
sysctl_jail_jailed, "I", "Process in jail?");
|
|
|
|
static int
|
|
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, havevnet;
|
|
#ifdef VIMAGE
|
|
struct ucred *cred = req->td->td_ucred;
|
|
|
|
havevnet = jailed(cred) && prison_owns_vnet(cred);
|
|
#else
|
|
havevnet = 0;
|
|
#endif
|
|
error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
|
|
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
|
|
sysctl_jail_vnet, "I", "Jail owns vnet?");
|
|
|
|
#if defined(INET) || defined(INET6)
|
|
SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
|
|
&jail_max_af_ips, 0,
|
|
"Number of IP addresses a jail may have at most per address family (deprecated)");
|
|
#endif
|
|
|
|
/*
|
|
* Default parameters for jail(2) compatibility. For historical reasons,
|
|
* the sysctl names have varying similarity to the parameter names. Prisons
|
|
* just see their own parameters, and can't change them.
|
|
*/
|
|
static int
|
|
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i;
|
|
|
|
/* Get the current flag value, and convert it to a boolean. */
|
|
if (req->td->td_ucred->cr_prison == &prison0) {
|
|
mtx_lock(&prison0.pr_mtx);
|
|
i = (jail_default_allow & arg2) != 0;
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
} else
|
|
i = prison_allow(req->td->td_ucred, arg2);
|
|
|
|
if (arg1 != NULL)
|
|
i = !i;
|
|
error = sysctl_handle_int(oidp, &i, 0, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
i = i ? arg2 : 0;
|
|
if (arg1 != NULL)
|
|
i ^= arg2;
|
|
/*
|
|
* The sysctls don't have CTLFLAGS_PRISON, so assume prison0
|
|
* for writing.
|
|
*/
|
|
mtx_lock(&prison0.pr_mtx);
|
|
jail_default_allow = (jail_default_allow & ~arg2) | i;
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
|
|
"Processes in jail can set their hostnames (deprecated)");
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
(void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
|
|
"Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
|
|
"Processes in jail can use System V IPC primitives (deprecated)");
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
|
|
"Prison root can create raw sockets (deprecated)");
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
|
|
"Processes in jail can alter system file flags (deprecated)");
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
|
|
"Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
|
|
|
|
static int
|
|
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct prison *pr;
|
|
int level, error;
|
|
|
|
pr = req->td->td_ucred->cr_prison;
|
|
level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
|
|
error = sysctl_handle_int(oidp, &level, 0, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
*(int *)arg1 = level;
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
&jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
|
|
sysctl_jail_default_level, "I",
|
|
"Processes in jail cannot see all mounted file systems (deprecated)");
|
|
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
|
|
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
|
|
&jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
|
|
sysctl_jail_default_level, "I",
|
|
"Ruleset for the devfs filesystem in jail (deprecated)");
|
|
|
|
/*
|
|
* Nodes to describe jail parameters. Maximum length of string parameters
|
|
* is returned in the string itself, and the other parameters exist merely
|
|
* to make themselves and their types known.
|
|
*/
|
|
SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
|
|
"Jail parameters");
|
|
|
|
int
|
|
sysctl_jail_param(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int i;
|
|
long l;
|
|
size_t s;
|
|
char numbuf[12];
|
|
|
|
switch (oidp->oid_kind & CTLTYPE)
|
|
{
|
|
case CTLTYPE_LONG:
|
|
case CTLTYPE_ULONG:
|
|
l = 0;
|
|
#ifdef SCTL_MASK32
|
|
if (!(req->flags & SCTL_MASK32))
|
|
#endif
|
|
return (SYSCTL_OUT(req, &l, sizeof(l)));
|
|
case CTLTYPE_INT:
|
|
case CTLTYPE_UINT:
|
|
i = 0;
|
|
return (SYSCTL_OUT(req, &i, sizeof(i)));
|
|
case CTLTYPE_STRING:
|
|
snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
|
|
return
|
|
(sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
|
|
case CTLTYPE_STRUCT:
|
|
s = (size_t)arg2;
|
|
return (SYSCTL_OUT(req, &s, sizeof(s)));
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
|
|
* jail creation time but cannot be changed in an existing jail.
|
|
*/
|
|
SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
|
|
SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
|
|
SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
|
|
SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
|
|
SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
|
|
"I", "Jail secure level");
|
|
SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
|
|
"Jail value for kern.osreldate and uname -K");
|
|
SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
|
|
"Jail value for kern.osrelease and uname -r");
|
|
SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
|
|
"I", "Jail cannot see all mounted file systems");
|
|
SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
|
|
"I", "Ruleset for in-jail devfs mounts");
|
|
SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail persistence");
|
|
#ifdef VIMAGE
|
|
SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
|
|
"E,jailsys", "Virtual network stack");
|
|
#endif
|
|
SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
|
|
"B", "Jail is in the process of shutting down");
|
|
|
|
SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
|
|
SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
|
|
"I", "Current number of child jails");
|
|
SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
|
|
"I", "Maximum number of child jails");
|
|
|
|
SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
|
|
SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
|
|
"Jail hostname");
|
|
SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
|
|
"Jail NIS domainname");
|
|
SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
|
|
"Jail host UUID");
|
|
SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
|
|
"LU", "Jail host ID");
|
|
|
|
SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
|
|
SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
|
|
|
|
#ifdef INET
|
|
SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
|
|
"Jail IPv4 address virtualization");
|
|
SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
|
|
"S,in_addr,a", "Jail IPv4 addresses");
|
|
SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Do (not) use IPv4 source address selection rather than the "
|
|
"primary jail IPv4 address.");
|
|
#endif
|
|
#ifdef INET6
|
|
SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
|
|
"Jail IPv6 address virtualization");
|
|
SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
|
|
"S,in6_addr,a", "Jail IPv6 addresses");
|
|
SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Do (not) use IPv6 source address selection rather than the "
|
|
"primary jail IPv6 address.");
|
|
#endif
|
|
|
|
SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
|
|
SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may set hostname");
|
|
SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may use SYSV IPC");
|
|
SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may create raw sockets");
|
|
SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may alter system file flags");
|
|
SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may set file quotas");
|
|
SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
|
|
SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may lock (unlock) physical pages in memory");
|
|
SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may bind sockets to reserved ports");
|
|
SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may read the kernel message buffer");
|
|
SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Unprivileged processes may use process debugging facilities");
|
|
SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Processes in jail with uid 0 have privilege");
|
|
|
|
SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
|
|
SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
|
|
"B", "Jail may mount/unmount jail-friendly file systems in general");
|
|
|
|
/*
|
|
* Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
|
|
* its associated bit in the pr_allow bitmask, or zero if the parameter was
|
|
* not created.
|
|
*/
|
|
unsigned
|
|
prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
|
|
const char *descr)
|
|
{
|
|
struct bool_flags *bf;
|
|
struct sysctl_oid *parent;
|
|
char *allow_name, *allow_noname, *allowed;
|
|
#ifndef NO_SYSCTL_DESCR
|
|
char *descr_deprecated;
|
|
#endif
|
|
u_int allow_flag;
|
|
|
|
if (prefix
|
|
? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
|
|
< 0 ||
|
|
asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
|
|
< 0
|
|
: asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
|
|
asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
|
|
free(allow_name, M_PRISON);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* See if this parameter has already beed added, i.e. a module was
|
|
* previously loaded/unloaded.
|
|
*/
|
|
mtx_lock(&prison0.pr_mtx);
|
|
for (bf = pr_flag_allow;
|
|
bf < pr_flag_allow + nitems(pr_flag_allow) &&
|
|
atomic_load_int(&bf->flag) != 0;
|
|
bf++) {
|
|
if (strcmp(bf->name, allow_name) == 0) {
|
|
allow_flag = bf->flag;
|
|
goto no_add;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find a free bit in pr_allow_all, failing if there are none
|
|
* (which shouldn't happen as long as we keep track of how many
|
|
* potential dynamic flags exist).
|
|
*/
|
|
for (allow_flag = 1;; allow_flag <<= 1) {
|
|
if (allow_flag == 0)
|
|
goto no_add;
|
|
if ((pr_allow_all & allow_flag) == 0)
|
|
break;
|
|
}
|
|
|
|
/* Note the parameter in the next open slot in pr_flag_allow. */
|
|
for (bf = pr_flag_allow; ; bf++) {
|
|
if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
|
|
/* This should never happen, but is not fatal. */
|
|
allow_flag = 0;
|
|
goto no_add;
|
|
}
|
|
if (atomic_load_int(&bf->flag) == 0)
|
|
break;
|
|
}
|
|
bf->name = allow_name;
|
|
bf->noname = allow_noname;
|
|
pr_allow_all |= allow_flag;
|
|
/*
|
|
* prison0 always has permission for the new parameter.
|
|
* Other jails must have it granted to them.
|
|
*/
|
|
prison0.pr_allow |= allow_flag;
|
|
/* The flag indicates a valid entry, so make sure it is set last. */
|
|
atomic_store_rel_int(&bf->flag, allow_flag);
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
|
|
/*
|
|
* Create sysctls for the paramter, and the back-compat global
|
|
* permission.
|
|
*/
|
|
parent = prefix
|
|
? SYSCTL_ADD_NODE(NULL,
|
|
SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
|
|
OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
|
|
: &sysctl___security_jail_param_allow;
|
|
(void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
|
|
name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
NULL, 0, sysctl_jail_param, "B", descr);
|
|
if ((prefix
|
|
? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
|
|
: asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
|
|
#ifndef NO_SYSCTL_DESCR
|
|
(void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
|
|
descr);
|
|
#endif
|
|
(void)SYSCTL_ADD_PROC(NULL,
|
|
SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
|
|
sysctl_jail_default_allow, "I", descr_deprecated);
|
|
#ifndef NO_SYSCTL_DESCR
|
|
free(descr_deprecated, M_TEMP);
|
|
#endif
|
|
free(allowed, M_TEMP);
|
|
}
|
|
return allow_flag;
|
|
|
|
no_add:
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
free(allow_name, M_PRISON);
|
|
free(allow_noname, M_PRISON);
|
|
return allow_flag;
|
|
}
|
|
|
|
/*
|
|
* The VFS system will register jail-aware filesystems here. They each get
|
|
* a parameter allow.mount.xxxfs and a flag to check when a jailed user
|
|
* attempts to mount.
|
|
*/
|
|
void
|
|
prison_add_vfs(struct vfsconf *vfsp)
|
|
{
|
|
#ifdef NO_SYSCTL_DESCR
|
|
|
|
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
|
|
NULL, NULL);
|
|
#else
|
|
char *descr;
|
|
|
|
(void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
|
|
vfsp->vfc_name);
|
|
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
|
|
NULL, descr);
|
|
free(descr, M_TEMP);
|
|
#endif
|
|
}
|
|
|
|
#ifdef RACCT
|
|
void
|
|
prison_racct_foreach(void (*callback)(struct racct *racct,
|
|
void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
|
|
void *arg2, void *arg3)
|
|
{
|
|
struct prison_racct *prr;
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
|
|
sx_slock(&allprison_lock);
|
|
if (pre != NULL)
|
|
(pre)();
|
|
LIST_FOREACH(prr, &allprison_racct, prr_next)
|
|
(callback)(prr->prr_racct, arg2, arg3);
|
|
if (post != NULL)
|
|
(post)();
|
|
sx_sunlock(&allprison_lock);
|
|
}
|
|
|
|
static struct prison_racct *
|
|
prison_racct_find_locked(const char *name)
|
|
{
|
|
struct prison_racct *prr;
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
sx_assert(&allprison_lock, SA_XLOCKED);
|
|
|
|
if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
|
|
return (NULL);
|
|
|
|
LIST_FOREACH(prr, &allprison_racct, prr_next) {
|
|
if (strcmp(name, prr->prr_name) != 0)
|
|
continue;
|
|
|
|
/* Found prison_racct with a matching name? */
|
|
prison_racct_hold(prr);
|
|
return (prr);
|
|
}
|
|
|
|
/* Add new prison_racct. */
|
|
prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
|
|
racct_create(&prr->prr_racct);
|
|
|
|
strcpy(prr->prr_name, name);
|
|
refcount_init(&prr->prr_refcount, 1);
|
|
LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
|
|
|
|
return (prr);
|
|
}
|
|
|
|
struct prison_racct *
|
|
prison_racct_find(const char *name)
|
|
{
|
|
struct prison_racct *prr;
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
|
|
sx_xlock(&allprison_lock);
|
|
prr = prison_racct_find_locked(name);
|
|
sx_xunlock(&allprison_lock);
|
|
return (prr);
|
|
}
|
|
|
|
void
|
|
prison_racct_hold(struct prison_racct *prr)
|
|
{
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
|
|
refcount_acquire(&prr->prr_refcount);
|
|
}
|
|
|
|
static void
|
|
prison_racct_free_locked(struct prison_racct *prr)
|
|
{
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
sx_assert(&allprison_lock, SA_XLOCKED);
|
|
|
|
if (refcount_release(&prr->prr_refcount)) {
|
|
racct_destroy(&prr->prr_racct);
|
|
LIST_REMOVE(prr, prr_next);
|
|
free(prr, M_PRISON_RACCT);
|
|
}
|
|
}
|
|
|
|
void
|
|
prison_racct_free(struct prison_racct *prr)
|
|
{
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
sx_assert(&allprison_lock, SA_UNLOCKED);
|
|
|
|
if (refcount_release_if_not_last(&prr->prr_refcount))
|
|
return;
|
|
|
|
sx_xlock(&allprison_lock);
|
|
prison_racct_free_locked(prr);
|
|
sx_xunlock(&allprison_lock);
|
|
}
|
|
|
|
static void
|
|
prison_racct_attach(struct prison *pr)
|
|
{
|
|
struct prison_racct *prr;
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
sx_assert(&allprison_lock, SA_XLOCKED);
|
|
|
|
prr = prison_racct_find_locked(pr->pr_name);
|
|
KASSERT(prr != NULL, ("cannot find prison_racct"));
|
|
|
|
pr->pr_prison_racct = prr;
|
|
}
|
|
|
|
/*
|
|
* Handle jail renaming. From the racct point of view, renaming means
|
|
* moving from one prison_racct to another.
|
|
*/
|
|
static void
|
|
prison_racct_modify(struct prison *pr)
|
|
{
|
|
#ifdef RCTL
|
|
struct proc *p;
|
|
struct ucred *cred;
|
|
#endif
|
|
struct prison_racct *oldprr;
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
|
|
sx_slock(&allproc_lock);
|
|
sx_xlock(&allprison_lock);
|
|
|
|
if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
|
|
sx_xunlock(&allprison_lock);
|
|
sx_sunlock(&allproc_lock);
|
|
return;
|
|
}
|
|
|
|
oldprr = pr->pr_prison_racct;
|
|
pr->pr_prison_racct = NULL;
|
|
|
|
prison_racct_attach(pr);
|
|
|
|
/*
|
|
* Move resource utilisation records.
|
|
*/
|
|
racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
|
|
|
|
#ifdef RCTL
|
|
/*
|
|
* Force rctl to reattach rules to processes.
|
|
*/
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
PROC_LOCK(p);
|
|
cred = crhold(p->p_ucred);
|
|
PROC_UNLOCK(p);
|
|
rctl_proc_ucred_changed(p, cred);
|
|
crfree(cred);
|
|
}
|
|
#endif
|
|
|
|
sx_sunlock(&allproc_lock);
|
|
prison_racct_free_locked(oldprr);
|
|
sx_xunlock(&allprison_lock);
|
|
}
|
|
|
|
static void
|
|
prison_racct_detach(struct prison *pr)
|
|
{
|
|
|
|
ASSERT_RACCT_ENABLED();
|
|
sx_assert(&allprison_lock, SA_UNLOCKED);
|
|
|
|
if (pr->pr_prison_racct == NULL)
|
|
return;
|
|
prison_racct_free(pr->pr_prison_racct);
|
|
pr->pr_prison_racct = NULL;
|
|
}
|
|
#endif /* RACCT */
|
|
|
|
#ifdef DDB
|
|
|
|
static void
|
|
db_show_prison(struct prison *pr)
|
|
{
|
|
struct bool_flags *bf;
|
|
struct jailsys_flags *jsf;
|
|
#if defined(INET) || defined(INET6)
|
|
int ii;
|
|
#endif
|
|
unsigned f;
|
|
#ifdef INET
|
|
char ip4buf[INET_ADDRSTRLEN];
|
|
#endif
|
|
#ifdef INET6
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
db_printf("prison %p:\n", pr);
|
|
db_printf(" jid = %d\n", pr->pr_id);
|
|
db_printf(" name = %s\n", pr->pr_name);
|
|
db_printf(" parent = %p\n", pr->pr_parent);
|
|
db_printf(" ref = %d\n", pr->pr_ref);
|
|
db_printf(" uref = %d\n", pr->pr_uref);
|
|
db_printf(" state = %s\n",
|
|
pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
|
|
pr->pr_state == PRISON_STATE_DYING ? "dying" :
|
|
"invalid");
|
|
db_printf(" path = %s\n", pr->pr_path);
|
|
db_printf(" cpuset = %d\n", pr->pr_cpuset
|
|
? pr->pr_cpuset->cs_id : -1);
|
|
#ifdef VIMAGE
|
|
db_printf(" vnet = %p\n", pr->pr_vnet);
|
|
#endif
|
|
db_printf(" root = %p\n", pr->pr_root);
|
|
db_printf(" securelevel = %d\n", pr->pr_securelevel);
|
|
db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
|
|
db_printf(" children.max = %d\n", pr->pr_childmax);
|
|
db_printf(" children.cur = %d\n", pr->pr_childcount);
|
|
db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
|
|
db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
|
|
db_printf(" flags = 0x%x", pr->pr_flags);
|
|
for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
|
|
if (pr->pr_flags & bf->flag)
|
|
db_printf(" %s", bf->name);
|
|
for (jsf = pr_flag_jailsys;
|
|
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
|
|
jsf++) {
|
|
f = pr->pr_flags & (jsf->disable | jsf->new);
|
|
db_printf(" %-16s= %s\n", jsf->name,
|
|
(f != 0 && f == jsf->disable) ? "disable"
|
|
: (f == jsf->new) ? "new"
|
|
: "inherit");
|
|
}
|
|
db_printf(" allow = 0x%x", pr->pr_allow);
|
|
for (bf = pr_flag_allow;
|
|
bf < pr_flag_allow + nitems(pr_flag_allow) &&
|
|
atomic_load_int(&bf->flag) != 0;
|
|
bf++)
|
|
if (pr->pr_allow & bf->flag)
|
|
db_printf(" %s", bf->name);
|
|
db_printf("\n");
|
|
db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
|
|
db_printf(" host.hostname = %s\n", pr->pr_hostname);
|
|
db_printf(" host.domainname = %s\n", pr->pr_domainname);
|
|
db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
|
|
db_printf(" host.hostid = %lu\n", pr->pr_hostid);
|
|
#ifdef INET
|
|
db_printf(" ip4s = %d\n", pr->pr_ip4s);
|
|
for (ii = 0; ii < pr->pr_ip4s; ii++)
|
|
db_printf(" %s %s\n",
|
|
ii == 0 ? "ip4.addr =" : " ",
|
|
inet_ntoa_r(pr->pr_ip4[ii], ip4buf));
|
|
#endif
|
|
#ifdef INET6
|
|
db_printf(" ip6s = %d\n", pr->pr_ip6s);
|
|
for (ii = 0; ii < pr->pr_ip6s; ii++)
|
|
db_printf(" %s %s\n",
|
|
ii == 0 ? "ip6.addr =" : " ",
|
|
ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
|
|
#endif
|
|
}
|
|
|
|
DB_SHOW_COMMAND(prison, db_show_prison_command)
|
|
{
|
|
struct prison *pr;
|
|
|
|
if (!have_addr) {
|
|
/*
|
|
* Show all prisons in the list, and prison0 which is not
|
|
* listed.
|
|
*/
|
|
db_show_prison(&prison0);
|
|
if (!db_pager_quit) {
|
|
TAILQ_FOREACH(pr, &allprison, pr_list) {
|
|
db_show_prison(pr);
|
|
if (db_pager_quit)
|
|
break;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (addr == 0)
|
|
pr = &prison0;
|
|
else {
|
|
/* Look for a prison with the ID and with references. */
|
|
TAILQ_FOREACH(pr, &allprison, pr_list)
|
|
if (pr->pr_id == addr && pr->pr_ref > 0)
|
|
break;
|
|
if (pr == NULL)
|
|
/* Look again, without requiring a reference. */
|
|
TAILQ_FOREACH(pr, &allprison, pr_list)
|
|
if (pr->pr_id == addr)
|
|
break;
|
|
if (pr == NULL)
|
|
/* Assume address points to a valid prison. */
|
|
pr = (struct prison *)addr;
|
|
}
|
|
db_show_prison(pr);
|
|
}
|
|
|
|
#endif /* DDB */
|