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freebsd-dev/sys/kern/kern_jail.c
Alexander V. Chernikov 04f75b9802 netlink: allow netlink sockets in non-vnet jails. 
This change allow to open Netlink sockets in the non-vnet jails, even for
 unpriviledged processes.
The security model largely follows the existing one. To be more specific:
* by default, every `NETLINK_ROUTE` command is **NOT** allowed in non-VNET
 jail UNLESS `RTNL_F_ALLOW_NONVNET_JAIL` flag is specified in the command
 handler.
* All notifications are **disabled** for non-vnet jails (requests to
 subscribe for the notifications are ignored). This will change to be more
 fine-grained model once the first netlink provider requiring this gets
 committed.
* Listing interfaces (RTM_GETLINK) is **allowed** w/o limits (**including**
 interfaces w/o any addresses attached to the jail). The value of this is
 questionable, but it follows the existing approach.
* Listing ARP/NDP neighbours is **forbidden**. This is a **change** from the
 current approach - currently we list static ARP/ND entries belonging to the
 addresses attached to the jail.
* Listing interface addresses is **allowed**, but the addresses are filtered
 to match only ones attached to the jail.
* Listing routes is **allowed**, but the routes are filtered to provide only
 host routes matching the addresses attached to the jail.
* By default, every `NETLINK_GENERIC` command is **allowed** in non-VNET jail
 (as sub-families may be unrelated to network at all).
 It is the goal of the family author to implement the restriction if
 necessary.

Differential Revision: https://reviews.freebsd.org/D39206
MFC after:	1 month
2023-03-26 08:44:09 +00:00

5012 lines
125 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1999 Poul-Henning Kamp.
* Copyright (c) 2008 Bjoern A. Zeeb.
* Copyright (c) 2009 James Gritton.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_nfs.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/sysproto.h>
#include <sys/malloc.h>
#include <sys/osd.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/epoch.h>
#include <sys/taskqueue.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/racct.h>
#include <sys/rctl.h>
#include <sys/refcount.h>
#include <sys/sx.h>
#include <sys/sysent.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/uuid.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/vnet.h>
#include <netinet/in.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif /* DDB */
#include <security/mac/mac_framework.h>
#define PRISON0_HOSTUUID_MODULE "hostuuid"
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
#ifdef INET
#ifdef INET6
#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
#else
#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
#endif
#else /* !INET */
#ifdef INET6
#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
#else
#define _PR_IP_SADDRSEL 0
#endif
#endif
/* prison0 describes what is "real" about the system. */
struct prison prison0 = {
.pr_id = 0,
.pr_name = "0",
.pr_ref = 1,
.pr_uref = 1,
.pr_path = "/",
.pr_securelevel = -1,
.pr_devfs_rsnum = 0,
.pr_state = PRISON_STATE_ALIVE,
.pr_childmax = JAIL_MAX,
.pr_hostuuid = DEFAULT_HOSTUUID,
.pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
#ifdef VIMAGE
.pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
#else
.pr_flags = PR_HOST|_PR_IP_SADDRSEL,
#endif
.pr_allow = PR_ALLOW_ALL_STATIC,
};
MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
struct bool_flags {
const char *name;
const char *noname;
volatile u_int flag;
};
struct jailsys_flags {
const char *name;
unsigned disable;
unsigned new;
};
/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
struct sx allprison_lock;
SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
LIST_HEAD(, prison_racct) allprison_racct;
int lastprid = 0;
static int get_next_prid(struct prison **insprp);
static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
static void prison_complete(void *context, int pending);
static void prison_deref(struct prison *pr, int flags);
static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
static int prison_lock_xlock(struct prison *pr, int flags);
static void prison_cleanup(struct prison *pr);
static void prison_free_not_last(struct prison *pr);
static void prison_proc_free_not_last(struct prison *pr);
static void prison_proc_relink(struct prison *opr, struct prison *npr,
struct proc *p);
static void prison_set_allow_locked(struct prison *pr, unsigned flag,
int enable);
static char *prison_path(struct prison *pr1, struct prison *pr2);
#ifdef RACCT
static void prison_racct_attach(struct prison *pr);
static void prison_racct_modify(struct prison *pr);
static void prison_racct_detach(struct prison *pr);
#endif
/* Flags for prison_deref */
#define PD_DEREF 0x01 /* Decrement pr_ref */
#define PD_DEUREF 0x02 /* Decrement pr_uref */
#define PD_KILL 0x04 /* Remove jail, kill processes, etc */
#define PD_LOCKED 0x10 /* pr_mtx is held */
#define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
#define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
#define PD_OP_FLAGS 0x07 /* Operation flags */
#define PD_LOCK_FLAGS 0x70 /* Lock status flags */
/*
* Parameter names corresponding to PR_* flag values. Size values are for kvm
* as we cannot figure out the size of a sparse array, or an array without a
* terminating entry.
*/
static struct bool_flags pr_flag_bool[] = {
{"persist", "nopersist", PR_PERSIST},
#ifdef INET
{"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
#endif
#ifdef INET6
{"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
#endif
};
const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
static struct jailsys_flags pr_flag_jailsys[] = {
{"host", 0, PR_HOST},
#ifdef VIMAGE
{"vnet", 0, PR_VNET},
#endif
#ifdef INET
{"ip4", PR_IP4_USER, PR_IP4_USER},
#endif
#ifdef INET6
{"ip6", PR_IP6_USER, PR_IP6_USER},
#endif
};
const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
/*
* Make this array full-size so dynamic parameters can be added.
* It is protected by prison0.mtx, but lockless reading is allowed
* with an atomic check of the flag values.
*/
static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
{"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
{"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
{"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
{"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
{"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
{"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
{"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
{"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
{"allow.reserved_ports", "allow.noreserved_ports",
PR_ALLOW_RESERVED_PORTS},
{"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
{"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
PR_ALLOW_UNPRIV_DEBUG},
{"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
#ifdef VIMAGE
{"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD},
#endif
};
static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
#define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
PR_ALLOW_RESERVED_PORTS | \
PR_ALLOW_UNPRIV_DEBUG | \
PR_ALLOW_SUSER)
#define JAIL_DEFAULT_ENFORCE_STATFS 2
#define JAIL_DEFAULT_DEVFS_RSNUM 0
static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
#if defined(INET) || defined(INET6)
static unsigned jail_max_af_ips = 255;
#endif
/*
* Initialize the parts of prison0 that can't be static-initialized with
* constants. This is called from proc0_init() after creating thread0 cpuset.
*/
void
prison0_init(void)
{
uint8_t *file, *data;
size_t size;
char buf[sizeof(prison0.pr_hostuuid)];
bool valid;
prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
prison0.pr_osreldate = osreldate;
strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
/* If we have a preloaded hostuuid, use it. */
file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
if (file != NULL) {
data = preload_fetch_addr(file);
size = preload_fetch_size(file);
if (data != NULL) {
/*
* The preloaded data may include trailing whitespace, almost
* certainly a newline; skip over any whitespace or
* non-printable characters to be safe.
*/
while (size > 0 && data[size - 1] <= 0x20) {
size--;
}
valid = false;
/*
* Not NUL-terminated when passed from loader, but
* validate_uuid requires that due to using sscanf (as
* does the subsequent strlcpy, since it still reads
* past the given size to return the true length);
* bounce to a temporary buffer to fix.
*/
if (size >= sizeof(buf))
goto done;
memcpy(buf, data, size);
buf[size] = '\0';
if (validate_uuid(buf, size, NULL, 0) != 0)
goto done;
valid = true;
(void)strlcpy(prison0.pr_hostuuid, buf,
sizeof(prison0.pr_hostuuid));
done:
if (bootverbose && !valid) {
printf("hostuuid: preload data malformed: '%.*s'\n",
(int)size, data);
}
}
}
if (bootverbose)
printf("hostuuid: using %s\n", prison0.pr_hostuuid);
}
/*
* struct jail_args {
* struct jail *jail;
* };
*/
int
sys_jail(struct thread *td, struct jail_args *uap)
{
uint32_t version;
int error;
struct jail j;
error = copyin(uap->jail, &version, sizeof(uint32_t));
if (error)
return (error);
switch (version) {
case 0:
{
struct jail_v0 j0;
/* FreeBSD single IPv4 jails. */
bzero(&j, sizeof(struct jail));
error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
if (error)
return (error);
j.version = j0.version;
j.path = j0.path;
j.hostname = j0.hostname;
j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
break;
}
case 1:
/*
* Version 1 was used by multi-IPv4 jail implementations
* that never made it into the official kernel.
*/
return (EINVAL);
case 2: /* JAIL_API_VERSION */
/* FreeBSD multi-IPv4/IPv6,noIP jails. */
error = copyin(uap->jail, &j, sizeof(struct jail));
if (error)
return (error);
break;
default:
/* Sci-Fi jails are not supported, sorry. */
return (EINVAL);
}
return (kern_jail(td, &j));
}
int
kern_jail(struct thread *td, struct jail *j)
{
struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
#ifdef INET
+ 1
#endif
#ifdef INET6
+ 1
#endif
)];
struct uio opt;
char *u_path, *u_hostname, *u_name;
struct bool_flags *bf;
#ifdef INET
uint32_t ip4s;
struct in_addr *u_ip4;
#endif
#ifdef INET6
struct in6_addr *u_ip6;
#endif
size_t tmplen;
int error, enforce_statfs;
bzero(&optiov, sizeof(optiov));
opt.uio_iov = optiov;
opt.uio_iovcnt = 0;
opt.uio_offset = -1;
opt.uio_resid = -1;
opt.uio_segflg = UIO_SYSSPACE;
opt.uio_rw = UIO_READ;
opt.uio_td = td;
/* Set permissions for top-level jails from sysctls. */
if (!jailed(td->td_ucred)) {
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++) {
optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
(jail_default_allow & bf->flag)
? bf->name : bf->noname);
optiov[opt.uio_iovcnt].iov_len =
strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
opt.uio_iovcnt += 2;
}
optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
opt.uio_iovcnt++;
enforce_statfs = jail_default_enforce_statfs;
optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
opt.uio_iovcnt++;
}
tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
#ifdef INET
ip4s = (j->version == 0) ? 1 : j->ip4s;
if (ip4s > jail_max_af_ips)
return (EINVAL);
tmplen += ip4s * sizeof(struct in_addr);
#else
if (j->ip4s > 0)
return (EINVAL);
#endif
#ifdef INET6
if (j->ip6s > jail_max_af_ips)
return (EINVAL);
tmplen += j->ip6s * sizeof(struct in6_addr);
#else
if (j->ip6s > 0)
return (EINVAL);
#endif
u_path = malloc(tmplen, M_TEMP, M_WAITOK);
u_hostname = u_path + MAXPATHLEN;
u_name = u_hostname + MAXHOSTNAMELEN;
#ifdef INET
u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
#endif
#ifdef INET6
#ifdef INET
u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
#else
u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
#endif
#endif
optiov[opt.uio_iovcnt].iov_base = "path";
optiov[opt.uio_iovcnt].iov_len = sizeof("path");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_path;
error = copyinstr(j->path, u_path, MAXPATHLEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = "host.hostname";
optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_hostname;
error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
if (j->jailname != NULL) {
optiov[opt.uio_iovcnt].iov_base = "name";
optiov[opt.uio_iovcnt].iov_len = sizeof("name");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_name;
error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
}
#ifdef INET
optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_ip4;
optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
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);
}
#if defined(INET) || defined(INET6)
typedef int prison_addr_cmp_t(const void *, const void *);
typedef bool prison_addr_valid_t(const void *);
static const struct pr_family {
size_t size;
prison_addr_cmp_t *cmp;
prison_addr_valid_t *valid;
int ip_flag;
} pr_families[PR_FAMILY_MAX] = {
#ifdef INET
[PR_INET] = {
.size = sizeof(struct in_addr),
.cmp = prison_qcmp_v4,
.valid = prison_valid_v4,
.ip_flag = PR_IP4_USER,
},
#endif
#ifdef INET6
[PR_INET6] = {
.size = sizeof(struct in6_addr),
.cmp = prison_qcmp_v6,
.valid = prison_valid_v6,
.ip_flag = PR_IP6_USER,
},
#endif
};
/*
* Network address lists (pr_addrs) allocation for jails. The addresses
* are accessed locklessly by the network stack, thus need to be protected by
* the network epoch.
*/
struct prison_ip {
struct epoch_context ctx;
uint32_t ips;
#ifdef FUTURE_C
/*
* XXX Variable-length automatic arrays in union may be
* supported in future C.
*/
union {
char pr_ip[];
struct in_addr pr_ip4[];
struct in6_addr pr_ip6[];
};
#else /* No future C :( */
char pr_ip[];
#endif
};
static char *
PR_IP(struct prison_ip *pip, const pr_family_t af, int idx)
{
MPASS(pip);
MPASS(af < PR_FAMILY_MAX);
MPASS(idx >= 0 && idx < pip->ips);
return (pip->pr_ip + pr_families[af].size * idx);
}
static struct prison_ip *
prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
{
struct prison_ip *pip;
pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
M_PRISON, flags);
if (pip != NULL)
pip->ips = cnt;
return (pip);
}
/*
* Allocate and copyin user supplied address list, sorting and validating.
* kern_jail_set() helper.
*/
static struct prison_ip *
prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
{
prison_addr_cmp_t *const cmp = pr_families[af].cmp;
const size_t size = pr_families[af].size;
struct prison_ip *pip;
pip = prison_ip_alloc(af, cnt, M_WAITOK);
bcopy(op, pip->pr_ip, cnt * size);
/*
* 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 (cnt > 1)
qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp);
/*
* Check for duplicate addresses and do some simple
* zero and broadcast checks. If users give other bogus
* addresses it is their problem.
*/
for (int i = 0; i < cnt; i++) {
if (!pr_families[af].valid(PR_IP(pip, af, i))) {
free(pip, M_PRISON);
return (NULL);
}
if (i + 1 < cnt &&
(cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 ||
cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) {
free(pip, M_PRISON);
return (NULL);
}
}
return (pip);
}
/*
* Allocate and dup parent prison address list.
* kern_jail_set() helper.
*/
static void
prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
{
const struct prison_ip *ppip = ppr->pr_addrs[af];
struct prison_ip *pip;
if (ppip != NULL) {
pip = prison_ip_alloc(af, ppip->ips, M_WAITOK);
bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size);
pr->pr_addrs[af] = pip;
}
}
/*
* 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.
* kern_jail_set() helper.
*/
static bool
prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip,
const pr_family_t af)
{
prison_addr_cmp_t *const cmp = pr_families[af].cmp;
int i, j;
if (ppip == NULL)
return (false);
for (i = 0; i < ppip->ips; i++)
if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0)
break;
if (i == ppip->ips)
/* Main address not present in parent. */
return (false);
if (pip->ips > 1) {
for (i = j = 1; i < pip->ips; i++) {
if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0)
/* Equals to parent primary address. */
continue;
for (; j < ppip->ips; j++)
if (cmp(PR_IP(pip, af, i),
PR_IP(ppip, af, j)) == 0)
break;
if (j == ppip->ips)
break;
}
if (j == ppip->ips)
/* Address not present in parent. */
return (false);
}
return (true);
}
/*
* 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.
* kern_jail_set() helper.
*/
static bool
prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
struct prison_ip *pip, pr_family_t af)
{
const struct prison *tppr, *tpr;
int descend;
#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_families[af].ip_flag))
continue;
descend = 0;
if (tpr->pr_addrs[af] == NULL ||
(pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
continue;
for (int i = 0; i < pip->ips; i++)
if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0)
return (false);
}
return (true);
}
_Static_assert(offsetof(struct prison_ip, ctx) == 0,
"prison must start with epoch context");
static void
prison_ip_free_deferred(epoch_context_t ctx)
{
free(ctx, M_PRISON);
}
static void
prison_ip_free(struct prison_ip *pip)
{
if (pip != NULL)
NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
}
static void
prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
{
struct prison_ip **mem, *old;
mtx_assert(&pr->pr_mtx, MA_OWNED);
mem = &pr->pr_addrs[af];
old = *mem;
atomic_store_ptr(mem, new);
prison_ip_free(old);
}
/*
* Restrict a prison's IP address list with its parent's, possibly replacing
* it. Return true if succeed, otherwise should redo.
* kern_jail_set() helper.
*/
static bool
prison_ip_restrict(struct prison *pr, const pr_family_t af,
struct prison_ip **newp)
{
struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
struct prison_ip *pip = pr->pr_addrs[af];
int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
const size_t size = pr_families[af].size;
struct prison_ip *new = newp != NULL ? *newp : NULL;
uint32_t ips;
mtx_assert(&pr->pr_mtx, MA_OWNED);
/*
* Due to epoch-synchronized access to the IP address lists we always
* allocate a new list even if the old one has enough space. We could
* atomically update an IPv4 address inside a list, but that would
* screw up sorting, and in case of IPv6 we can't even atomically write
* one.
*/
if (ppip == NULL) {
if (pip != NULL)
prison_ip_set(pr, af, NULL);
return (true);
}
if (!(pr->pr_flags & pr_families[af].ip_flag)) {
if (new == NULL) {
new = prison_ip_alloc(af, ppip->ips, M_NOWAIT);
if (new == NULL)
return (false); /* Redo */
}
/* This has no user settings, so just copy the parent's list. */
MPASS(new->ips == ppip->ips);
bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size);
prison_ip_set(pr, af, new);
if (newp != NULL)
*newp = NULL; /* Used */
} else if (pip != NULL) {
/* Remove addresses that aren't in the parent. */
int i;
i = 0; /* index in pip */
ips = 0; /* index in new */
if (new == NULL) {
new = prison_ip_alloc(af, pip->ips, M_NOWAIT);
if (new == NULL)
return (false); /* Redo */
}
for (int pi = 0; pi < ppip->ips; pi++)
if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) {
/* Found our primary address in parent. */
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
ips++;
break;
}
for (int pi = 1; i < pip->ips; ) {
/* Check against primary, which is unsorted. */
if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) {
/* Matches parent's primary address. */
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
ips++;
continue;
}
/* The rest are sorted. */
switch (pi >= ppip->ips ? -1 :
cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) {
case -1:
i++;
break;
case 0:
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
pi++;
ips++;
break;
case 1:
pi++;
break;
}
}
if (ips == 0) {
if (newp == NULL || *newp == NULL)
prison_ip_free(new);
new = NULL;
} else {
/* Shrink to real size */
KASSERT((new->ips >= ips),
("Out-of-bounds write to prison_ip %p", new));
new->ips = ips;
}
prison_ip_set(pr, af, new);
if (newp != NULL)
*newp = NULL; /* Used */
}
return (true);
}
/*
* Fast-path check if an address belongs to a prison.
*/
int
prison_ip_check(const struct prison *pr, const pr_family_t af,
const void *addr)
{
int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
struct prison_ip *pip;
int i, a, z, d;
MPASS(mtx_owned(&pr->pr_mtx) ||
in_epoch(net_epoch_preempt) ||
sx_xlocked(&allprison_lock));
pip = atomic_load_ptr(&pr->pr_addrs[af]);
if (__predict_false(pip == NULL))
return (EAFNOSUPPORT);
/* Check the primary IP. */
if (cmp(PR_IP(pip, af, 0), addr) == 0)
return (0);
/*
* All the other IPs are sorted so we can do a binary search.
*/
a = 0;
z = pip->ips - 2;
while (a <= z) {
i = (a + z) / 2;
d = cmp(PR_IP(pip, af, i + 1), addr);
if (d > 0)
z = i - 1;
else if (d < 0)
a = i + 1;
else
return (0);
}
return (EADDRNOTAVAIL);
}
/*
* Grab primary IP. Historically required mutex, but nothing prevents
* us to support epoch-protected access. Is it used in fast path?
* in{6}_jail.c helper
*/
const void *
prison_ip_get0(const struct prison *pr, const pr_family_t af)
{
const struct prison_ip *pip = pr->pr_addrs[af];
mtx_assert(&pr->pr_mtx, MA_OWNED);
MPASS(pip);
return (pip->pr_ip);
}
u_int
prison_ip_cnt(const struct prison *pr, const pr_family_t af)
{
return (pr->pr_addrs[af]->ips);
}
#endif /* defined(INET) || defined(INET6) */
int
kern_jail_set(struct thread *td, struct uio *optuio, int flags)
{
struct nameidata nd;
#ifdef INET
struct prison_ip *ip4;
#endif
#ifdef INET6
struct prison_ip *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)
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;
#ifdef INET
int ip4s;
bool redo_ip4;
#endif
#ifdef INET6
int ip6s;
bool 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(struct in_addr) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP4_USER;
pr_flags |= PR_IP4_USER;
if (ip4s > 0) {
ip4s /= sizeof(struct in_addr);
if (ip4s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv4 addresses");
goto done_errmsg;
}
ip4 = prison_ip_copyin(PR_INET, op, ip4s);
if (ip4 == NULL) {
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(struct in6_addr) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP6_USER;
pr_flags |= PR_IP6_USER;
if (ip6s > 0) {
ip6s /= sizeof(struct in6_addr);
if (ip6s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv6 addresses");
goto done_errmsg;
}
ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
if (ip6 == NULL) {
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);
error = namei(&nd);
if (error)
goto done_free;
root = nd.ni_vp;
NDFREE_PNBUF(&nd);
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;
prison_ip_dup(ppr, pr, PR_INET);
}
#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;
prison_ip_dup(ppr, pr, PR_INET6);
}
#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) &&
!prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
PR_INET)) {
error = EPERM;
goto done_deref;
}
if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
error = EADDRINUSE;
vfs_opterror(opts, "IPv4 addresses clash");
goto done_deref;
}
}
#endif
#ifdef INET6
if (ip6s > 0) {
if ((ppr->pr_flags & PR_IP6) &&
!prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
PR_INET6)) {
error = EPERM;
goto done_deref;
}
if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
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 = false;
if (pr_flags & PR_IP4_USER) {
pr->pr_flags |= PR_IP4;
prison_ip_set(pr, PR_INET, ip4);
ip4 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET, NULL)) {
redo_ip4 = true;
descend = 0;
}
}
}
#endif
#ifdef INET6
redo_ip6 = false;
if (pr_flags & PR_IP6_USER) {
pr->pr_flags |= PR_IP6;
prison_ip_set(pr, PR_INET6, ip6);
ip6 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET6, NULL)) {
redo_ip6 = true;
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_addrs[PR_INET]->ips;
MPASS(ip4 == NULL);
ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip4 = false;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET, &ip4))
redo_ip4 = true;
}
mtx_unlock(&pr->pr_mtx);
}
#endif
#ifdef INET6
while (redo_ip6) {
ip6s = pr->pr_addrs[PR_INET6]->ips;
MPASS(ip6 == NULL);
ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip6 = false;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET6, &ip6))
redo_ip6 = true;
}
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
if (born && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 &&
(pr->pr_root->v_vflag & VV_ROOT) == 0)
printf("Warning jail jid=%d: mountd/nfsd requires a separate"
" file system\n", pr->pr_id);
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
prison_ip_free(ip4);
#endif
#ifdef INET6
prison_ip_free(ip6);
#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_addrs[PR_INET]->pr_ip,
pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
pr_families[PR_INET].size : 0 );
if (error != 0 && error != ENOENT)
goto done;
#endif
#ifdef INET6
error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip,
pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
pr_families[PR_INET6].size : 0 );
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_proc_relink(oldcred->cr_prison, pr, p);
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.
*/
bool
prison_flag(struct ucred *cred, unsigned flag)
{
return ((cred->cr_prison->pr_flags & flag) != 0);
}
/*
* See if a prison has the specific allow flag set.
* The prison *should* be locked, or only a single bit is examined, without
* regard to any other prison data.
*/
bool
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 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 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
}
void
prison_proc_link(struct prison *pr, struct proc *p)
{
sx_assert(&allproc_lock, SA_XLOCKED);
LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
}
void
prison_proc_unlink(struct prison *pr, struct proc *p)
{
sx_assert(&allproc_lock, SA_XLOCKED);
LIST_REMOVE(p, p_jaillist);
}
static void
prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
{
sx_xlock(&allproc_lock);
prison_proc_unlink(opr, p);
prison_proc_link(npr, p);
sx_xunlock(&allproc_lock);
}
/*
* 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);
}
static void
prison_kill_processes_cb(struct proc *p, void *arg __unused)
{
kern_psignal(p, SIGKILL);
}
/*
* Note the iteration does not guarantee acting on all processes.
* Most notably there may be fork or jail_attach in progress.
*/
void
prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
void *cbarg)
{
struct prison *ppr;
struct proc *p;
if (atomic_load_int(&pr->pr_childcount) == 0) {
sx_slock(&allproc_lock);
LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
if (p->p_state == PRS_NEW)
continue;
PROC_LOCK(p);
cb(p, cbarg);
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
if (atomic_load_int(&pr->pr_childcount) == 0)
return;
/*
* Some jails popped up during the iteration, fall through to a
* system-wide search.
*/
}
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 == pr) {
cb(p, cbarg);
break;
}
}
}
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
}
/*
* 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;
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;
prison_cleanup(pr);
}
}
}
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)
prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
/*
* 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
prison_ip_free(rpr->pr_addrs[PR_INET]);
#endif
#ifdef INET6
prison_ip_free(rpr->pr_addrs[PR_INET6]);
#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;
prison_cleanup(cpr);
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);
prison_cleanup(pr);
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;
}
/*
* Release a prison's resources when it starts dying (when the last user
* reference is dropped, or when it is killed).
*/
static void
prison_cleanup(struct prison *pr)
{
sx_assert(&allprison_lock, SA_XLOCKED);
mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
vfs_exjail_delete(pr);
shm_remove_prison(pr);
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
}
/*
* 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_addrs[PR_INET] == 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_addrs[PR_INET6] == NULL)
error = EAFNOSUPPORT;
mtx_unlock(&pr->pr_mtx);
}
break;
#endif
case AF_LOCAL:
case AF_ROUTE:
case AF_NETLINK:
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);
}
/*
* For mountd/nfsd to run within a prison, it must be:
* - A vnet prison.
* - PR_ALLOW_NFSD must be set on it.
* - The root directory (pr_root) of the prison must be
* a file system mount point, so the mountd can hang
* export information on it.
* - The prison's enforce_statfs cannot be 0, so that
* mountd(8) can do exports.
*/
bool
prison_check_nfsd(struct ucred *cred)
{
if (jailed_without_vnet(cred))
return (false);
if (!prison_allow(cred, PR_ALLOW_NFSD))
return (false);
if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0)
return (false);
if (cred->cr_prison->pr_enforce_statfs == 0)
return (false);
return (true);
}
/*
* Return true if p2 is a child of p1, otherwise false.
*/
bool
prison_ischild(struct prison *pr1, struct prison *pr2)
{
for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
if (pr1 == pr2)
return (true);
return (false);
}
/*
* 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(const 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 true if the passed credential is in a jail and that jail does not
* have its own virtual network stack, otherwise false.
*/
bool
jailed_without_vnet(struct ucred *cred)
{
if (!jailed(cred))
return (false);
#ifdef VIMAGE
if (prison_owns_vnet(cred))
return (false);
#endif
return (true);
}
/*
* 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 true in case the prison owns the vnet, false otherwise.
*/
bool
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) != 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) {
/*
* NFS-specific privileges.
*/
case PRIV_NFS_DAEMON:
case PRIV_VFS_GETFH:
case PRIV_VFS_MOUNT_EXPORTED:
if (!prison_check_nfsd(cred))
return (EPERM);
#ifdef notyet
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:
case PRIV_NET_OVPN:
case PRIV_NET_ME:
case PRIV_NET_WG:
/*
* 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");
#if defined(INET) || defined(INET6)
/*
* Copy address array to memory that would be then SYSCTL_OUT-ed.
* sysctl_jail_list() helper.
*/
static void
prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
{
const struct prison_ip *pip;
const size_t size = pr_families[af].size;
again:
mtx_assert(&pr->pr_mtx, MA_OWNED);
if ((pip = pr->pr_addrs[af]) != NULL) {
if (*len < pip->ips) {
*len = pip->ips;
mtx_unlock(&pr->pr_mtx);
*out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
mtx_lock(&pr->pr_mtx);
goto again;
}
bcopy(pip->pr_ip, *out, pip->ips * size);
}
}
#endif
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) {
mtx_lock(&cpr->pr_mtx);
#ifdef INET
prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
#endif
#ifdef INET6
prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
#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 = ip4s;
#endif
#ifdef INET6
xp->pr_ip6s = 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");
#ifdef VIMAGE
SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW,
"B", "Mountd/nfsd may run in the jail");
#endif
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 parameter, 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;
struct prison_ip *pip;
#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
if ((pip = pr->pr_addrs[PR_INET]) != NULL) {
db_printf(" ip4s = %d\n", pip->ips);
for (ii = 0; ii < pip->ips; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip4.addr =" : " ",
inet_ntoa_r(
*(const struct in_addr *)PR_IP(pip, PR_INET, ii),
ip4buf));
}
#endif
#ifdef INET6
if ((pip = pr->pr_addrs[PR_INET6]) != NULL) {
db_printf(" ip6s = %d\n", pip->ips);
for (ii = 0; ii < pip->ips; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip6.addr =" : " ",
ip6_sprintf(ip6buf,
(const struct in6_addr *)PR_IP(pip, PR_INET6, 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 */
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