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freebsd-skq/sys/kern/kern_jail.c
Kyle Evans 63619b6dba vfs: add restrictions to read(2) of a directory [2/2] 
This commit adds the priv(9) that waters down the sysctl to make it only
allow read(2) of a dirfd by the system root. Jailed root is not allowed, but
jail policy and superuser policy will abstain from allowing/denying it so
that a MAC module can fully control the policy.

Such a MAC module has been written, and can be found at:
https://people.freebsd.org/~kevans/mac_read_dir-0.1.0.tar.gz

It is expected that the MAC module won't be needed by many, as most only
need to do such diagnostics that require this behavior as system root
anyways. Interested parties are welcome to grab the MAC module above and
create a port or locally integrate it, and with enough support it could see
introduction to base. As noted in mac_read_dir.c, it is released under the
BSD 2 clause license and allows the restrictions to be lifted for only
jailed root or for all unprivileged users.

PR:		246412
Reviewed by:	mckusick, kib, emaste, jilles, cy, phk, imp (all previous)
Reviewed by:	rgrimes (latest version)
Differential Revision:	https://reviews.freebsd.org/D24596
2020-06-04 18:17:25 +00:00

4263 lines
106 KiB
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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 <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/taskqueue.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/linker.h>
#include <sys/lock.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 DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
#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_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;
unsigned 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 do_jail_attach(struct thread *td, struct prison *pr);
static void prison_complete(void *context, int pending);
static void prison_deref(struct prison *pr, int flags);
static char *prison_path(struct prison *pr1, struct prison *pr2);
static void prison_remove_one(struct prison *pr);
#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
#define PD_DEUREF 0x02
#define PD_LOCKED 0x04
#define PD_LIST_SLOCKED 0x08
#define PD_LIST_XLOCKED 0x10
/*
* 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. */
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},
};
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)
#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;
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) {
data[size--] = '\0';
}
if (validate_uuid(data, size, NULL, 0) == 0) {
(void)strlcpy(prison0.pr_hostuuid, data,
size + 1);
} else if (bootverbose) {
printf("hostuuid: preload data malformed: '%s'",
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) &&
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);
}
int
kern_jail_set(struct thread *td, struct uio *optuio, int flags)
{
struct nameidata nd;
#ifdef INET
struct in_addr *ip4;
#endif
#ifdef INET6
struct in6_addr *ip6;
#endif
struct vfsopt *opt;
struct vfsoptlist *opts;
struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
struct vnode *root;
char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
char *g_path, *osrelstr;
struct bool_flags *bf;
struct jailsys_flags *jsf;
#if defined(INET) || defined(INET6)
struct prison *tppr;
void *op;
#endif
unsigned long hid;
size_t namelen, onamelen, pnamelen;
int born, created, cuflags, descend, enforce;
int error, errmsg_len, errmsg_pos;
int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
int jid, jsys, len, level;
int childmax, osreldt, rsnum, slevel;
#if defined(INET) || defined(INET6)
int ii, ij;
#endif
#ifdef INET
int ip4s, redo_ip4;
#endif
#ifdef INET6
int ip6s, redo_ip6;
#endif
uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
uint64_t pr_allow_diff;
unsigned tallow;
char numbuf[12];
error = priv_check(td, PRIV_JAIL_SET);
if (!error && (flags & JAIL_ATTACH))
error = priv_check(td, PRIV_JAIL_ATTACH);
if (error)
return (error);
mypr = td->td_ucred->cr_prison;
if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
return (EPERM);
if (flags & ~JAIL_SET_MASK)
return (EINVAL);
/*
* Check all the parameters before committing to anything. Not all
* errors can be caught early, but we may as well try. Also, this
* takes care of some expensive stuff (path lookup) before getting
* the allprison lock.
*
* XXX Jails are not filesystems, and jail parameters are not mount
* options. But it makes more sense to re-use the vfsopt code
* than duplicate it under a different name.
*/
error = vfs_buildopts(optuio, &opts);
if (error)
return (error);
#ifdef INET
ip4 = NULL;
#endif
#ifdef INET6
ip6 = NULL;
#endif
g_path = NULL;
cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
if (!cuflags) {
error = EINVAL;
vfs_opterror(opts, "no valid operation (create or update)");
goto done_errmsg;
}
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
if (error == ENOENT)
jid = 0;
else if (error != 0)
goto done_free;
error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
if (error == ENOENT)
gotslevel = 0;
else if (error != 0)
goto done_free;
else
gotslevel = 1;
error =
vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
if (error == ENOENT)
gotchildmax = 0;
else if (error != 0)
goto done_free;
else
gotchildmax = 1;
error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
if (error == ENOENT)
gotenforce = 0;
else if (error != 0)
goto done_free;
else if (enforce < 0 || enforce > 2) {
error = EINVAL;
goto done_free;
} else
gotenforce = 1;
error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
if (error == ENOENT)
gotrsnum = 0;
else if (error != 0)
goto done_free;
else
gotrsnum = 1;
pr_flags = ch_flags = 0;
for (bf = pr_flag_bool;
bf < pr_flag_bool + nitems(pr_flag_bool);
bf++) {
vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
}
ch_flags |= pr_flags;
for (jsf = pr_flag_jailsys;
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
jsf++) {
error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
if (error == ENOENT)
continue;
if (error != 0)
goto done_free;
switch (jsys) {
case JAIL_SYS_DISABLE:
if (!jsf->disable) {
error = EINVAL;
goto done_free;
}
pr_flags |= jsf->disable;
break;
case JAIL_SYS_NEW:
pr_flags |= jsf->new;
break;
case JAIL_SYS_INHERIT:
break;
default:
error = EINVAL;
goto done_free;
}
ch_flags |= jsf->new | jsf->disable;
}
if ((flags & (JAIL_CREATE | JAIL_UPDATE | 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) && bf->flag != 0;
bf++) {
vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
}
ch_allow |= pr_allow;
error = vfs_getopt(opts, "name", (void **)&name, &len);
if (error == ENOENT)
name = NULL;
else if (error != 0)
goto done_free;
else {
if (len == 0 || name[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
if (error == ENOENT)
host = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || host[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
if (error == ENOENT)
domain = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || domain[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
if (error == ENOENT)
uuid = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || uuid[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > HOSTUUIDLEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
#ifdef COMPAT_FREEBSD32
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
uint32_t hid32;
error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
hid = hid32;
} else
#endif
error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
if (error == ENOENT)
gothid = 0;
else if (error != 0)
goto done_free;
else {
gothid = 1;
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
}
#ifdef INET
error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
if (error == ENOENT)
ip4s = 0;
else if (error != 0)
goto done_free;
else if (ip4s & (sizeof(*ip4) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP4_USER;
pr_flags |= PR_IP4_USER;
if (ip4s > 0) {
ip4s /= sizeof(*ip4);
if (ip4s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv4 addresses");
goto done_errmsg;
}
ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
bcopy(op, ip4, ip4s * sizeof(*ip4));
/*
* IP addresses are all sorted but ip[0] to preserve
* the primary IP address as given from userland.
* This special IP is used for unbound outgoing
* connections as well for "loopback" traffic in case
* source address selection cannot find any more fitting
* address to connect from.
*/
if (ip4s > 1)
qsort(ip4 + 1, ip4s - 1, sizeof(*ip4),
prison_qcmp_v4);
/*
* Check for duplicate addresses and do some simple
* zero and broadcast checks. If users give other bogus
* addresses it is their problem.
*
* We do not have to care about byte order for these
* checks so we will do them in NBO.
*/
for (ii = 0; ii < ip4s; ii++) {
if (ip4[ii].s_addr == INADDR_ANY ||
ip4[ii].s_addr == INADDR_BROADCAST) {
error = EINVAL;
goto done_free;
}
if ((ii+1) < ip4s &&
(ip4[0].s_addr == ip4[ii+1].s_addr ||
ip4[ii].s_addr == ip4[ii+1].s_addr)) {
error = EINVAL;
goto done_free;
}
}
}
}
#endif
#ifdef INET6
error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
if (error == ENOENT)
ip6s = 0;
else if (error != 0)
goto done_free;
else if (ip6s & (sizeof(*ip6) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP6_USER;
pr_flags |= PR_IP6_USER;
if (ip6s > 0) {
ip6s /= sizeof(*ip6);
if (ip6s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv6 addresses");
goto done_errmsg;
}
ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
bcopy(op, ip6, ip6s * sizeof(*ip6));
if (ip6s > 1)
qsort(ip6 + 1, ip6s - 1, sizeof(*ip6),
prison_qcmp_v6);
for (ii = 0; ii < ip6s; ii++) {
if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
error = EINVAL;
goto done_free;
}
if ((ii+1) < ip6s &&
(IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
{
error = EINVAL;
goto done_free;
}
}
}
}
#endif
#if defined(VIMAGE) && (defined(INET) || defined(INET6))
if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
error = EINVAL;
vfs_opterror(opts,
"vnet jails cannot have IP address restrictions");
goto done_errmsg;
}
#endif
error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
if (error == ENOENT)
osrelstr = NULL;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"osrelease cannot be changed after creation");
goto done_errmsg;
}
if (len == 0 || osrelstr[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len >= OSRELEASELEN) {
error = ENAMETOOLONG;
vfs_opterror(opts,
"osrelease string must be 1-%d bytes long",
OSRELEASELEN - 1);
goto done_errmsg;
}
}
error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
if (error == ENOENT)
osreldt = 0;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"osreldate cannot be changed after creation");
goto done_errmsg;
}
if (osreldt == 0) {
error = EINVAL;
vfs_opterror(opts, "osreldate cannot be 0");
goto done_errmsg;
}
}
root = NULL;
error = vfs_getopt(opts, "path", (void **)&path, &len);
if (error == ENOENT)
path = NULL;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"path cannot be changed after creation");
goto done_errmsg;
}
if (len == 0 || path[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
path, td);
error = namei(&nd);
if (error)
goto done_free;
root = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
strlcpy(g_path, path, MAXPATHLEN);
error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
if (error == 0) {
path = g_path;
} else {
/* exit on other errors */
goto done_free;
}
if (root->v_type != VDIR) {
error = ENOTDIR;
vput(root);
goto done_free;
}
VOP_UNLOCK(root);
}
/*
* Find the specified jail, or at least its parent.
* This abuses the file error codes ENOENT and EEXIST.
*/
pr = NULL;
ppr = mypr;
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);
if (jid != 0) {
/*
* See if a requested jid already exists. There is an
* information leak here if the jid exists but is not within
* the caller's jail hierarchy. Jail creators will get EEXIST
* even though they cannot see the jail, and CREATE | UPDATE
* will return ENOENT which is not normally a valid error.
*/
if (jid < 0) {
error = EINVAL;
vfs_opterror(opts, "negative jid");
goto done_unlock_list;
}
pr = prison_find(jid);
if (pr != NULL) {
ppr = pr->pr_parent;
/* Create: jid must not exist. */
if (cuflags == JAIL_CREATE) {
mtx_unlock(&pr->pr_mtx);
error = EEXIST;
vfs_opterror(opts, "jail %d already exists",
jid);
goto done_unlock_list;
}
if (!prison_ischild(mypr, pr)) {
mtx_unlock(&pr->pr_mtx);
pr = NULL;
} else if (pr->pr_uref == 0) {
if (!(flags & JAIL_DYING)) {
mtx_unlock(&pr->pr_mtx);
error = ENOENT;
vfs_opterror(opts, "jail %d is dying",
jid);
goto done_unlock_list;
} else 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);
}
}
}
if (pr == NULL) {
/* Update: jid must exist. */
if (cuflags == JAIL_UPDATE) {
error = ENOENT;
vfs_opterror(opts, "jail %d not found", jid);
goto done_unlock_list;
}
}
}
/*
* 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') {
mtx_unlock(&pr->pr_mtx);
error = EINVAL;
vfs_opterror(opts,
"cannot change jail's parent");
goto done_unlock_list;
}
} else {
*namelc = '\0';
ppr = prison_find_name(mypr, name);
if (ppr == NULL) {
error = ENOENT;
vfs_opterror(opts,
"jail \"%s\" not found", name);
goto done_unlock_list;
}
mtx_unlock(&ppr->pr_mtx);
*namelc = '.';
}
namelc++;
}
if (namelc[0] != '\0') {
pnamelen =
(ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
name_again:
deadpr = NULL;
FOREACH_PRISON_CHILD(ppr, tpr) {
if (tpr != pr && tpr->pr_ref > 0 &&
!strcmp(tpr->pr_name + pnamelen, namelc)) {
if (pr == NULL &&
cuflags != JAIL_CREATE) {
mtx_lock(&tpr->pr_mtx);
if (tpr->pr_ref > 0) {
/*
* Use this jail
* for updates.
*/
if (tpr->pr_uref > 0) {
pr = tpr;
break;
}
deadpr = tpr;
}
mtx_unlock(&tpr->pr_mtx);
} else if (tpr->pr_uref > 0) {
/*
* Create, or update(jid):
* name must not exist in an
* active sibling jail.
*/
error = EEXIST;
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
vfs_opterror(opts,
"jail \"%s\" already exists",
name);
goto done_unlock_list;
}
}
}
/* If no active jail is found, use a dying one. */
if (deadpr != NULL && pr == NULL) {
if (flags & JAIL_DYING) {
mtx_lock(&deadpr->pr_mtx);
if (deadpr->pr_ref == 0) {
mtx_unlock(&deadpr->pr_mtx);
goto name_again;
}
pr = deadpr;
} else if (cuflags == JAIL_UPDATE) {
error = ENOENT;
vfs_opterror(opts,
"jail \"%s\" is dying", name);
goto done_unlock_list;
}
}
/* 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_unlock_list;
}
}
}
/* 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_unlock_list;
}
/* If there's no prison to update, create a new one and link it in. */
if (pr == NULL) {
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_unlock_list;
}
created = 1;
mtx_lock(&ppr->pr_mtx);
if (ppr->pr_ref == 0) {
mtx_unlock(&ppr->pr_mtx);
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" not found",
prison_name(mypr, ppr));
goto done_unlock_list;
}
ppr->pr_ref++;
ppr->pr_uref++;
mtx_unlock(&ppr->pr_mtx);
pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
if (jid == 0) {
/* Find the next free jid. */
jid = lastprid + 1;
findnext:
if (jid == JAIL_MAX)
jid = 1;
TAILQ_FOREACH(tpr, &allprison, pr_list) {
if (tpr->pr_id < jid)
continue;
if (tpr->pr_id > jid || tpr->pr_ref == 0) {
TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
break;
}
if (jid == lastprid) {
error = EAGAIN;
vfs_opterror(opts,
"no available jail IDs");
free(pr, M_PRISON);
prison_deref(ppr, PD_DEREF |
PD_DEUREF | PD_LIST_XLOCKED);
goto done_releroot;
}
jid++;
goto findnext;
}
lastprid = jid;
} else {
/*
* The jail already has a jid (that did not yet exist),
* so just find where to insert it.
*/
TAILQ_FOREACH(tpr, &allprison, pr_list)
if (tpr->pr_id >= jid) {
TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
break;
}
}
if (tpr == NULL)
TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
tpr->pr_childcount++;
pr->pr_parent = ppr;
pr->pr_id = jid;
/* Set some default values, and inherit some from the parent. */
if (namelc == NULL)
namelc = "";
if (path == NULL) {
path = "/";
root = mypr->pr_root;
vref(root);
}
strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
pr->pr_flags |= PR_HOST;
#if defined(INET) || defined(INET6)
#ifdef VIMAGE
if (!(pr_flags & PR_VNET))
#endif
{
#ifdef INET
if (!(ch_flags & PR_IP4_USER))
pr->pr_flags |= PR_IP4 | PR_IP4_USER;
else if (!(pr_flags & PR_IP4_USER)) {
pr->pr_flags |= ppr->pr_flags & PR_IP4;
if (ppr->pr_ip4 != NULL) {
pr->pr_ip4s = ppr->pr_ip4s;
pr->pr_ip4 = malloc(pr->pr_ip4s *
sizeof(struct in_addr), M_PRISON,
M_WAITOK);
bcopy(ppr->pr_ip4, pr->pr_ip4,
pr->pr_ip4s * sizeof(*pr->pr_ip4));
}
}
#endif
#ifdef INET6
if (!(ch_flags & PR_IP6_USER))
pr->pr_flags |= PR_IP6 | PR_IP6_USER;
else if (!(pr_flags & PR_IP6_USER)) {
pr->pr_flags |= ppr->pr_flags & PR_IP6;
if (ppr->pr_ip6 != NULL) {
pr->pr_ip6s = ppr->pr_ip6s;
pr->pr_ip6 = malloc(pr->pr_ip6s *
sizeof(struct in6_addr), M_PRISON,
M_WAITOK);
bcopy(ppr->pr_ip6, pr->pr_ip6,
pr->pr_ip6s * sizeof(*pr->pr_ip6));
}
}
#endif
}
#endif
/* Source address selection is always on by default. */
pr->pr_flags |= _PR_IP_SADDRSEL;
pr->pr_securelevel = ppr->pr_securelevel;
pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
pr->pr_enforce_statfs = jail_default_enforce_statfs;
pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
if (osrelstr == NULL)
strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
sizeof(pr->pr_osrelease));
else
strlcpy(pr->pr_osrelease, osrelstr,
sizeof(pr->pr_osrelease));
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);
#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 erorr.
*/
error = cpuset_create_root(ppr, &pr->pr_cpuset);
if (error) {
prison_deref(pr, PD_LIST_XLOCKED);
goto done_releroot;
}
mtx_lock(&pr->pr_mtx);
/*
* New prisons do not yet have a reference, because we do not
* want others to see the incomplete prison once the
* allprison_lock is downgraded.
*/
} else {
created = 0;
/*
* Grab a reference for existing prisons, to ensure they
* continue to exist for the duration of the call.
*/
pr->pr_ref++;
#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_locked;
}
#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_locked;
}
#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_locked;
}
#endif
}
/* Do final error checking before setting anything. */
if (gotslevel) {
if (slevel < ppr->pr_securelevel) {
error = EPERM;
goto done_deref_locked;
}
}
if (gotchildmax) {
if (childmax >= ppr->pr_childmax) {
error = EPERM;
goto done_deref_locked;
}
}
if (gotenforce) {
if (enforce < ppr->pr_enforce_statfs) {
error = EPERM;
goto done_deref_locked;
}
}
if (gotrsnum) {
/*
* devfs_rsnum is a uint16_t
*/
if (rsnum < 0 || rsnum > 65535) {
error = EINVAL;
goto done_deref_locked;
}
/*
* 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_locked;
} else
rsnum = ppr->pr_devfs_rsnum;
}
}
#ifdef INET
if (ip4s > 0) {
if (ppr->pr_flags & PR_IP4) {
/*
* Make sure the new set of IP addresses is a
* subset of the parent's list. Don't worry
* about the parent being unlocked, as any
* setting is done with allprison_lock held.
*/
for (ij = 0; ij < ppr->pr_ip4s; ij++)
if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
break;
if (ij == ppr->pr_ip4s) {
error = EPERM;
goto done_deref_locked;
}
if (ip4s > 1) {
for (ii = ij = 1; ii < ip4s; ii++) {
if (ip4[ii].s_addr ==
ppr->pr_ip4[0].s_addr)
continue;
for (; ij < ppr->pr_ip4s; ij++)
if (ip4[ii].s_addr ==
ppr->pr_ip4[ij].s_addr)
break;
if (ij == ppr->pr_ip4s)
break;
}
if (ij == ppr->pr_ip4s) {
error = EPERM;
goto done_deref_locked;
}
}
}
/*
* Check for conflicting IP addresses. We permit them
* if there is no more than one IP on each jail. If
* there is a duplicate on a jail with more than one
* IP stop checking and return error.
*/
#ifdef VIMAGE
for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
if (tppr->pr_flags & PR_VNET)
break;
#else
tppr = &prison0;
#endif
FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
if (tpr == pr ||
#ifdef VIMAGE
(tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
#endif
tpr->pr_uref == 0) {
descend = 0;
continue;
}
if (!(tpr->pr_flags & PR_IP4_USER))
continue;
descend = 0;
if (tpr->pr_ip4 == NULL ||
(ip4s == 1 && tpr->pr_ip4s == 1))
continue;
for (ii = 0; ii < ip4s; ii++) {
if (prison_check_ip4_locked(tpr, &ip4[ii]) ==
0) {
error = EADDRINUSE;
vfs_opterror(opts,
"IPv4 addresses clash");
goto done_deref_locked;
}
}
}
}
#endif
#ifdef INET6
if (ip6s > 0) {
if (ppr->pr_flags & PR_IP6) {
/*
* Make sure the new set of IP addresses is a
* subset of the parent's list.
*/
for (ij = 0; ij < ppr->pr_ip6s; ij++)
if (IN6_ARE_ADDR_EQUAL(&ip6[0],
&ppr->pr_ip6[ij]))
break;
if (ij == ppr->pr_ip6s) {
error = EPERM;
goto done_deref_locked;
}
if (ip6s > 1) {
for (ii = ij = 1; ii < ip6s; ii++) {
if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
&ppr->pr_ip6[0]))
continue;
for (; ij < ppr->pr_ip6s; ij++)
if (IN6_ARE_ADDR_EQUAL(
&ip6[ii], &ppr->pr_ip6[ij]))
break;
if (ij == ppr->pr_ip6s)
break;
}
if (ij == ppr->pr_ip6s) {
error = EPERM;
goto done_deref_locked;
}
}
}
/* Check for conflicting IP addresses. */
#ifdef VIMAGE
for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
if (tppr->pr_flags & PR_VNET)
break;
#else
tppr = &prison0;
#endif
FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
if (tpr == pr ||
#ifdef VIMAGE
(tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
#endif
tpr->pr_uref == 0) {
descend = 0;
continue;
}
if (!(tpr->pr_flags & PR_IP6_USER))
continue;
descend = 0;
if (tpr->pr_ip6 == NULL ||
(ip6s == 1 && tpr->pr_ip6s == 1))
continue;
for (ii = 0; ii < ip6s; ii++) {
if (prison_check_ip6_locked(tpr, &ip6[ii]) ==
0) {
error = EADDRINUSE;
vfs_opterror(opts,
"IPv6 addresses clash");
goto done_deref_locked;
}
}
}
}
#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_locked;
}
/*
* 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_locked;
}
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
if (strlen(tpr->pr_name) + (namelen - onamelen) >=
sizeof(pr->pr_name)) {
error = ENAMETOOLONG;
goto done_deref_locked;
}
}
}
pr_allow_diff = pr_allow & ~ppr->pr_allow;
if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
error = EPERM;
goto done_deref_locked;
}
/*
* 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);
error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
if (error != 0) {
prison_deref(pr, created
? PD_LIST_XLOCKED
: PD_DEREF | PD_LIST_XLOCKED);
goto done_releroot;
}
mtx_lock(&pr->pr_mtx);
/* 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_locked;
}
}
/* Set the parameters of the prison. */
#ifdef INET
redo_ip4 = 0;
if (pr_flags & PR_IP4_USER) {
pr->pr_flags |= PR_IP4;
free(pr->pr_ip4, M_PRISON);
pr->pr_ip4s = ip4s;
pr->pr_ip4 = ip4;
ip4 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (prison_restrict_ip4(tpr, NULL)) {
redo_ip4 = 1;
descend = 0;
}
}
}
#endif
#ifdef INET6
redo_ip6 = 0;
if (pr_flags & PR_IP6_USER) {
pr->pr_flags |= PR_IP6;
free(pr->pr_ip6, M_PRISON);
pr->pr_ip6s = ip6s;
pr->pr_ip6 = ip6;
ip6 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (prison_restrict_ip6(tpr, NULL)) {
redo_ip6 = 1;
descend = 0;
}
}
}
#endif
if (gotslevel) {
pr->pr_securelevel = slevel;
/* Set all child jails to be at least this level. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
if (tpr->pr_securelevel < slevel)
tpr->pr_securelevel = slevel;
}
if (gotchildmax) {
pr->pr_childmax = childmax;
/* Set all child jails to under this limit. */
FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
if (tpr->pr_childmax > childmax - level)
tpr->pr_childmax = childmax > level
? childmax - level : 0;
}
if (gotenforce) {
pr->pr_enforce_statfs = enforce;
/* Pass this restriction on to the children. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
if (tpr->pr_enforce_statfs < enforce)
tpr->pr_enforce_statfs = enforce;
}
if (gotrsnum) {
pr->pr_devfs_rsnum = rsnum;
/* Pass this restriction on to the children. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
tpr->pr_devfs_rsnum = rsnum;
}
if (namelc != NULL) {
if (ppr == &prison0)
strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
else
snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
ppr->pr_name, namelc);
/* Change this component of child names. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
strlen(tpr->pr_name + onamelen) + 1);
bcopy(pr->pr_name, tpr->pr_name, namelen);
}
}
if (path != NULL) {
/* Try to keep a real-rooted full pathname. */
strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
pr->pr_root = root;
}
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;
}
}
}
if ((tallow = ch_allow & ~pr_allow)) {
/* Clear allow bits in all children. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
tpr->pr_allow &= ~tallow;
}
pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
/*
* Persistent prisons get an extra reference, and prisons losing their
* persist flag lose that reference. Only do this for existing prisons
* for now, so new ones will remain unseen until after the module
* handlers have completed.
*/
born = pr->pr_uref == 0;
if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
if (pr_flags & PR_PERSIST) {
pr->pr_ref++;
pr->pr_uref++;
} else {
pr->pr_ref--;
pr->pr_uref--;
}
}
pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
mtx_unlock(&pr->pr_mtx);
#ifdef RACCT
if (racct_enable && created)
prison_racct_attach(pr);
#endif
/* Locks may have prevented a complete restriction of child IP
* addresses. If so, allocate some more memory and try again.
*/
#ifdef INET
while (redo_ip4) {
ip4s = pr->pr_ip4s;
ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip4 = 0;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (prison_restrict_ip4(tpr, ip4)) {
if (ip4 != NULL)
ip4 = NULL;
else
redo_ip4 = 1;
}
}
mtx_unlock(&pr->pr_mtx);
}
#endif
#ifdef INET6
while (redo_ip6) {
ip6s = pr->pr_ip6s;
ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip6 = 0;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (prison_restrict_ip6(tpr, ip6)) {
if (ip6 != NULL)
ip6 = NULL;
else
redo_ip6 = 1;
}
}
mtx_unlock(&pr->pr_mtx);
}
#endif
/* Let the modules do their work. */
sx_downgrade(&allprison_lock);
if (born) {
error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
if (error) {
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
prison_deref(pr, created
? PD_LIST_SLOCKED
: PD_DEREF | PD_LIST_SLOCKED);
goto done_errmsg;
}
}
error = osd_jail_call(pr, PR_METHOD_SET, opts);
if (error) {
if (born)
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
prison_deref(pr, created
? PD_LIST_SLOCKED
: PD_DEREF | PD_LIST_SLOCKED);
goto done_errmsg;
}
/* Attach this process to the prison if requested. */
if (flags & JAIL_ATTACH) {
mtx_lock(&pr->pr_mtx);
error = do_jail_attach(td, pr);
if (error) {
vfs_opterror(opts, "attach failed");
if (!created)
prison_deref(pr, PD_DEREF);
goto done_errmsg;
}
}
#ifdef RACCT
if (racct_enable && !created) {
if (!(flags & JAIL_ATTACH))
sx_sunlock(&allprison_lock);
prison_racct_modify(pr);
if (!(flags & JAIL_ATTACH))
sx_slock(&allprison_lock);
}
#endif
td->td_retval[0] = pr->pr_id;
/*
* Now that it is all there, drop the temporary reference from existing
* prisons. Or add a reference to newly created persistent prisons
* (which was not done earlier so that the prison would not be publicly
* visible).
*/
if (!created) {
prison_deref(pr, (flags & JAIL_ATTACH)
? PD_DEREF
: PD_DEREF | PD_LIST_SLOCKED);
} else {
if (pr_flags & PR_PERSIST) {
mtx_lock(&pr->pr_mtx);
pr->pr_ref++;
pr->pr_uref++;
mtx_unlock(&pr->pr_mtx);
}
if (!(flags & JAIL_ATTACH))
sx_sunlock(&allprison_lock);
}
goto done_free;
done_deref_locked:
prison_deref(pr, created
? PD_LOCKED | PD_LIST_XLOCKED
: PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
goto done_releroot;
done_unlock_list:
sx_xunlock(&allprison_lock);
done_releroot:
if (root != NULL)
vrele(root);
done_errmsg:
if (error) {
if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
&errmsg_len) == 0 && errmsg_len > 0) {
errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
if (optuio->uio_segflg == UIO_SYSSPACE)
bcopy(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
else
copyout(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
}
}
done_free:
#ifdef INET
free(ip4, M_PRISON);
#endif
#ifdef INET6
free(ip6, M_PRISON);
#endif
if (g_path != NULL)
free(g_path, M_TEMP);
vfs_freeopts(opts);
return (error);
}
/*
* 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 error, errmsg_len, errmsg_pos, i, jid, len, locked, 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;
/*
* Find the prison specified by one of: lastjid, jid, name.
*/
sx_slock(&allprison_lock);
error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
if (error == 0) {
TAILQ_FOREACH(pr, &allprison, pr_list) {
if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_ref > 0 &&
(pr->pr_uref > 0 || (flags & JAIL_DYING)))
break;
mtx_unlock(&pr->pr_mtx);
}
}
if (pr != NULL)
goto found_prison;
error = ENOENT;
vfs_opterror(opts, "no jail after %d", jid);
goto done_unlock_list;
} else if (error != ENOENT)
goto done_unlock_list;
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
if (error == 0) {
if (jid != 0) {
pr = prison_find_child(mypr, jid);
if (pr != NULL) {
if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
mtx_unlock(&pr->pr_mtx);
error = ENOENT;
vfs_opterror(opts, "jail %d is dying",
jid);
goto done_unlock_list;
}
goto found_prison;
}
error = ENOENT;
vfs_opterror(opts, "jail %d not found", jid);
goto done_unlock_list;
}
} else if (error != ENOENT)
goto done_unlock_list;
error = vfs_getopt(opts, "name", (void **)&name, &len);
if (error == 0) {
if (len == 0 || name[len - 1] != '\0') {
error = EINVAL;
goto done_unlock_list;
}
pr = prison_find_name(mypr, name);
if (pr != NULL) {
if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
mtx_unlock(&pr->pr_mtx);
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" is dying",
name);
goto done_unlock_list;
}
goto found_prison;
}
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" not found", name);
goto done_unlock_list;
} else if (error != ENOENT)
goto done_unlock_list;
vfs_opterror(opts, "no jail specified");
error = ENOENT;
goto done_unlock_list;
found_prison:
/* Get the parameters of the prison. */
pr->pr_ref++;
locked = PD_LOCKED;
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_deref;
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_deref;
error = vfs_setopts(opts, "name", prison_name(mypr, pr));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
sizeof(pr->pr_cpuset->cs_id));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "path", prison_path(mypr, pr));
if (error != 0 && error != ENOENT)
goto done_deref;
#ifdef INET
error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
pr->pr_ip4s * sizeof(*pr->pr_ip4));
if (error != 0 && error != ENOENT)
goto done_deref;
#endif
#ifdef INET6
error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
pr->pr_ip6s * sizeof(*pr->pr_ip6));
if (error != 0 && error != ENOENT)
goto done_deref;
#endif
error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
sizeof(pr->pr_securelevel));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
sizeof(pr->pr_childcount));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
sizeof(pr->pr_childmax));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
if (error != 0 && error != ENOENT)
goto done_deref;
#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_deref;
error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
sizeof(pr->pr_enforce_statfs));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
sizeof(pr->pr_devfs_rsnum));
if (error != 0 && error != ENOENT)
goto done_deref;
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_deref;
i = !i;
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done_deref;
}
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_deref;
}
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) && 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_deref;
i = !i;
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done_deref;
}
i = (pr->pr_uref == 0);
error = vfs_setopt(opts, "dying", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done_deref;
i = !i;
error = vfs_setopt(opts, "nodying", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
sizeof(pr->pr_osreldate));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
if (error != 0 && error != ENOENT)
goto done_deref;
/* Get the module parameters. */
mtx_unlock(&pr->pr_mtx);
locked = 0;
error = osd_jail_call(pr, PR_METHOD_GET, opts);
if (error)
goto done_deref;
prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
/* 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_errmsg;
}
}
/* 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;
}
}
}
}
goto done_errmsg;
done_deref:
prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
goto done_errmsg;
done_unlock_list:
sx_sunlock(&allprison_lock);
done_errmsg:
if (error && errmsg_pos >= 0) {
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, *cpr, *lpr, *tpr;
int descend, 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);
}
/* Remove all descendants of this prison, then remove this prison. */
pr->pr_ref++;
if (!LIST_EMPTY(&pr->pr_children)) {
mtx_unlock(&pr->pr_mtx);
lpr = NULL;
FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
mtx_lock(&cpr->pr_mtx);
if (cpr->pr_ref > 0) {
tpr = cpr;
cpr->pr_ref++;
} else {
/* Already removed - do not do it again. */
tpr = NULL;
}
mtx_unlock(&cpr->pr_mtx);
if (lpr != NULL) {
mtx_lock(&lpr->pr_mtx);
prison_remove_one(lpr);
sx_xlock(&allprison_lock);
}
lpr = tpr;
}
if (lpr != NULL) {
mtx_lock(&lpr->pr_mtx);
prison_remove_one(lpr);
sx_xlock(&allprison_lock);
}
mtx_lock(&pr->pr_mtx);
}
prison_remove_one(pr);
return (0);
}
static void
prison_remove_one(struct prison *pr)
{
struct proc *p;
int deuref;
/* If the prison was persistent, it is not anymore. */
deuref = 0;
if (pr->pr_flags & PR_PERSIST) {
pr->pr_ref--;
deuref = PD_DEUREF;
pr->pr_flags &= ~PR_PERSIST;
}
/*
* jail_remove added a reference. If that's the only one, remove
* the prison now.
*/
KASSERT(pr->pr_ref > 0,
("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
if (pr->pr_ref == 1) {
prison_deref(pr,
deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
return;
}
mtx_unlock(&pr->pr_mtx);
sx_xunlock(&allprison_lock);
/*
* Kill all processes unfortunate enough to be attached to this prison.
*/
sx_slock(&allproc_lock);
FOREACH_PROC_IN_SYSTEM(p) {
PROC_LOCK(p);
if (p->p_state != PRS_NEW && p->p_ucred &&
p->p_ucred->cr_prison == pr)
kern_psignal(p, SIGKILL);
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
/* Remove the temporary reference added by jail_remove. */
prison_deref(pr, deuref | PD_DEREF);
}
/*
* 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);
/*
* Start with exclusive hold on allprison_lock to ensure that a possible
* PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
* But then immediately downgrade it since we don't need to stop
* readers.
*/
sx_xlock(&allprison_lock);
sx_downgrade(&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
* considered to be "alive".
*/
if (pr->pr_uref == 0) {
mtx_unlock(&pr->pr_mtx);
sx_sunlock(&allprison_lock);
return (EINVAL);
}
return (do_jail_attach(td, pr));
}
static int
do_jail_attach(struct thread *td, struct prison *pr)
{
struct proc *p;
struct ucred *newcred, *oldcred;
int error;
/*
* 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.
*/
pr->pr_ref++;
pr->pr_uref++;
mtx_unlock(&pr->pr_mtx);
/* Let modules do whatever they need to prepare for attaching. */
error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
if (error) {
prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
return (error);
}
sx_sunlock(&allprison_lock);
/*
* 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(td, pr->pr_root)))
goto e_revert_osd;
newcred = crget();
PROC_LOCK(p);
oldcred = crcopysafe(p, newcred);
newcred->cr_prison = pr;
proc_set_cred(p, newcred);
setsugid(p);
#ifdef RACCT
racct_proc_ucred_changed(p, oldcred, newcred);
crhold(newcred);
#endif
PROC_UNLOCK(p);
#ifdef RCTL
rctl_proc_ucred_changed(p, newcred);
crfree(newcred);
#endif
prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
crfree(oldcred);
return (0);
e_unlock:
VOP_UNLOCK(pr->pr_root);
e_revert_osd:
/* Tell modules this thread is still in its old jail after all. */
(void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
prison_deref(pr, PD_DEREF | PD_DEUREF);
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) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_ref > 0)
return (pr);
mtx_unlock(&pr->pr_mtx);
}
}
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) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_ref > 0)
return (pr);
mtx_unlock(&pr->pr_mtx);
}
}
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;
again:
deadpr = NULL;
FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
if (!strcmp(pr->pr_name + mylen, name)) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_ref > 0) {
if (pr->pr_uref > 0)
return (pr);
deadpr = pr;
}
mtx_unlock(&pr->pr_mtx);
}
}
/* There was no valid prison - perhaps there was a dying one. */
if (deadpr != NULL) {
mtx_lock(&deadpr->pr_mtx);
if (deadpr->pr_ref == 0) {
mtx_unlock(&deadpr->pr_mtx);
goto again;
}
}
return (deadpr);
}
/*
* See if a prison has the specific flag set.
*/
int
prison_flag(struct ucred *cred, unsigned flag)
{
/* This is an atomic read, so no locking is necessary. */
return (cred->cr_prison->pr_flags & flag);
}
int
prison_allow(struct ucred *cred, unsigned flag)
{
/* This is an atomic read, so no locking is necessary. */
return (cred->cr_prison->pr_allow & flag);
}
/*
* Remove a prison reference. If that was the last reference, remove the
* prison itself - but not in this context in case there are locks held.
*/
void
prison_free_locked(struct prison *pr)
{
int ref;
mtx_assert(&pr->pr_mtx, MA_OWNED);
ref = --pr->pr_ref;
mtx_unlock(&pr->pr_mtx);
if (ref == 0)
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
}
void
prison_free(struct prison *pr)
{
mtx_lock(&pr->pr_mtx);
prison_free_locked(pr);
}
/*
* Complete a call to either prison_free or prison_proc_free.
*/
static void
prison_complete(void *context, int pending)
{
struct prison *pr = context;
sx_xlock(&allprison_lock);
mtx_lock(&pr->pr_mtx);
prison_deref(pr, pr->pr_uref
? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
: PD_LOCKED | PD_LIST_XLOCKED);
}
/*
* Remove a prison reference (usually). This internal version assumes no
* mutexes are 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 prison *ppr, *tpr;
int ref, lasturef;
if (!(flags & PD_LOCKED))
mtx_lock(&pr->pr_mtx);
for (;;) {
if (flags & PD_DEUREF) {
KASSERT(pr->pr_uref > 0,
("prison_deref PD_DEUREF on a dead prison (jid=%d)",
pr->pr_id));
pr->pr_uref--;
lasturef = pr->pr_uref == 0;
if (lasturef)
pr->pr_ref++;
KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
} else
lasturef = 0;
if (flags & PD_DEREF) {
KASSERT(pr->pr_ref > 0,
("prison_deref PD_DEREF on a dead prison (jid=%d)",
pr->pr_id));
pr->pr_ref--;
}
ref = pr->pr_ref;
mtx_unlock(&pr->pr_mtx);
/*
* Tell the modules if the last user reference was removed
* (even it sticks around in dying state).
*/
if (lasturef) {
if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
sx_xlock(&allprison_lock);
flags |= PD_LIST_XLOCKED;
}
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
mtx_lock(&pr->pr_mtx);
ref = --pr->pr_ref;
mtx_unlock(&pr->pr_mtx);
}
/* If the prison still has references, nothing else to do. */
if (ref > 0) {
if (flags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
else if (flags & PD_LIST_XLOCKED)
sx_xunlock(&allprison_lock);
return;
}
if (flags & PD_LIST_SLOCKED) {
if (!sx_try_upgrade(&allprison_lock)) {
sx_sunlock(&allprison_lock);
sx_xlock(&allprison_lock);
}
} else if (!(flags & PD_LIST_XLOCKED))
sx_xlock(&allprison_lock);
TAILQ_REMOVE(&allprison, pr, pr_list);
LIST_REMOVE(pr, pr_sibling);
ppr = pr->pr_parent;
for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
tpr->pr_childcount--;
sx_xunlock(&allprison_lock);
#ifdef VIMAGE
if (pr->pr_vnet != ppr->pr_vnet)
vnet_destroy(pr->pr_vnet);
#endif
if (pr->pr_root != NULL)
vrele(pr->pr_root);
mtx_destroy(&pr->pr_mtx);
#ifdef INET
free(pr->pr_ip4, M_PRISON);
#endif
#ifdef INET6
free(pr->pr_ip6, M_PRISON);
#endif
if (pr->pr_cpuset != NULL)
cpuset_rel(pr->pr_cpuset);
osd_jail_exit(pr);
#ifdef RACCT
if (racct_enable)
prison_racct_detach(pr);
#endif
free(pr, M_PRISON);
/* Removing a prison frees a reference on its parent. */
pr = ppr;
mtx_lock(&pr->pr_mtx);
flags = PD_DEREF | PD_DEUREF;
}
}
void
prison_hold_locked(struct prison *pr)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
KASSERT(pr->pr_ref > 0,
("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
pr->pr_ref++;
}
void
prison_hold(struct prison *pr)
{
mtx_lock(&pr->pr_mtx);
prison_hold_locked(pr);
mtx_unlock(&pr->pr_mtx);
}
void
prison_proc_hold(struct prison *pr)
{
mtx_lock(&pr->pr_mtx);
KASSERT(pr->pr_uref > 0,
("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
pr->pr_uref++;
mtx_unlock(&pr->pr_mtx);
}
void
prison_proc_free(struct prison *pr)
{
mtx_lock(&pr->pr_mtx);
KASSERT(pr->pr_uref > 0,
("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
if (pr->pr_uref > 1)
pr->pr_uref--;
else {
/*
* 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.
*/
pr->pr_ref++;
mtx_unlock(&pr->pr_mtx);
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
return;
}
mtx_unlock(&pr->pr_mtx);
}
/*
* Check if a jail supports the given address family.
*
* Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
* if not.
*/
int
prison_check_af(struct ucred *cred, int af)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
pr = cred->cr_prison;
#ifdef VIMAGE
/* Prisons with their own network stack are not limited. */
if (prison_owns_vnet(cred))
return (0);
#endif
error = 0;
switch (af)
{
#ifdef INET
case AF_INET:
if (pr->pr_flags & PR_IP4)
{
mtx_lock(&pr->pr_mtx);
if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
error = EAFNOSUPPORT;
mtx_unlock(&pr->pr_mtx);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (pr->pr_flags & PR_IP6)
{
mtx_lock(&pr->pr_mtx);
if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
error = EAFNOSUPPORT;
mtx_unlock(&pr->pr_mtx);
}
break;
#endif
case AF_LOCAL:
case AF_ROUTE:
break;
default:
if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Check if given address belongs to the jail referenced by cred (wrapper to
* prison_check_ip[46]).
*
* Returns 0 if jail doesn't restrict the address family or if address belongs
* to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
* the jail doesn't allow the address family. IPv4 Address passed in in NBO.
*/
int
prison_if(struct ucred *cred, const struct sockaddr *sa)
{
#ifdef INET
const struct sockaddr_in *sai;
#endif
#ifdef INET6
const struct sockaddr_in6 *sai6;
#endif
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
#ifdef VIMAGE
if (prison_owns_vnet(cred))
return (0);
#endif
error = 0;
switch (sa->sa_family)
{
#ifdef INET
case AF_INET:
sai = (const struct sockaddr_in *)sa;
error = prison_check_ip4(cred, &sai->sin_addr);
break;
#endif
#ifdef INET6
case AF_INET6:
sai6 = (const struct sockaddr_in6 *)sa;
error = prison_check_ip6(cred, &sai6->sin6_addr);
break;
#endif
default:
if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
*/
int
prison_check(struct ucred *cred1, struct ucred *cred2)
{
return ((cred1->cr_prison == cred2->cr_prison ||
prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
}
/*
* Return 1 if p2 is a child of p1, otherwise 0.
*/
int
prison_ischild(struct prison *pr1, struct prison *pr2)
{
for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
if (pr1 == pr2)
return (1);
return (0);
}
/*
* Return 1 if the passed credential is in a jail and that jail does not
* have its own virtual network stack, otherwise 0.
*/
int
jailed_without_vnet(struct ucred *cred)
{
if (!jailed(cred))
return (0);
#ifdef VIMAGE
if (prison_owns_vnet(cred))
return (0);
#endif
return (1);
}
/*
* Return the correct hostname (domainname, et al) for the passed credential.
*/
void
getcredhostname(struct ucred *cred, char *buf, size_t size)
{
struct prison *pr;
/*
* A NULL credential can be used to shortcut to the physical
* system's hostname.
*/
pr = (cred != NULL) ? cred->cr_prison : &prison0;
mtx_lock(&pr->pr_mtx);
strlcpy(buf, pr->pr_hostname, size);
mtx_unlock(&pr->pr_mtx);
}
void
getcreddomainname(struct ucred *cred, char *buf, size_t size)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(buf, cred->cr_prison->pr_domainname, size);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getcredhostuuid(struct ucred *cred, char *buf, size_t size)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getcredhostid(struct ucred *cred, unsigned long *hostid)
{
mtx_lock(&cred->cr_prison->pr_mtx);
*hostid = cred->cr_prison->pr_hostid;
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getjailname(struct ucred *cred, char *name, size_t len)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(name, cred->cr_prison->pr_name, len);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
#ifdef VIMAGE
/*
* Determine whether the prison represented by cred owns
* its vnet rather than having it inherited.
*
* Returns 1 in case the prison owns the vnet, 0 otherwise.
*/
int
prison_owns_vnet(struct ucred *cred)
{
/*
* vnets cannot be added/removed after jail creation,
* so no need to lock here.
*/
return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
}
#endif
/*
* Determine whether the subject represented by cred can "see"
* status of a mount point.
* Returns: 0 for permitted, ENOENT otherwise.
* XXX: This function should be called cr_canseemount() and should be
* placed in kern_prot.c.
*/
int
prison_canseemount(struct ucred *cred, struct mount *mp)
{
struct prison *pr;
struct statfs *sp;
size_t len;
pr = cred->cr_prison;
if (pr->pr_enforce_statfs == 0)
return (0);
if (pr->pr_root->v_mount == mp)
return (0);
if (pr->pr_enforce_statfs == 2)
return (ENOENT);
/*
* If jail's chroot directory is set to "/" we should be able to see
* all mount-points from inside a jail.
* This is ugly check, but this is the only situation when jail's
* directory ends with '/'.
*/
if (strcmp(pr->pr_path, "/") == 0)
return (0);
len = strlen(pr->pr_path);
sp = &mp->mnt_stat;
if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
return (ENOENT);
/*
* Be sure that we don't have situation where jail's root directory
* is "/some/path" and mount point is "/some/pathpath".
*/
if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
return (ENOENT);
return (0);
}
void
prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
{
char jpath[MAXPATHLEN];
struct prison *pr;
size_t len;
pr = cred->cr_prison;
if (pr->pr_enforce_statfs == 0)
return;
if (prison_canseemount(cred, mp) != 0) {
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
strlcpy(sp->f_mntonname, "[restricted]",
sizeof(sp->f_mntonname));
return;
}
if (pr->pr_root->v_mount == mp) {
/*
* Clear current buffer data, so we are sure nothing from
* the valid path left there.
*/
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
*sp->f_mntonname = '/';
return;
}
/*
* If jail's chroot directory is set to "/" we should be able to see
* all mount-points from inside a jail.
*/
if (strcmp(pr->pr_path, "/") == 0)
return;
len = strlen(pr->pr_path);
strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
/*
* Clear current buffer data, so we are sure nothing from
* the valid path left there.
*/
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
if (*jpath == '\0') {
/* Should never happen. */
*sp->f_mntonname = '/';
} else {
strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
}
}
/*
* Check with permission for a specific privilege is granted within jail. We
* have a specific list of accepted privileges; the rest are denied.
*/
int
prison_priv_check(struct ucred *cred, int priv)
{
/*
* Some policies have custom handlers. This routine should not be
* called for them. See priv_check_cred().
*/
switch (priv) {
case PRIV_VFS_GENERATION:
KASSERT(0, ("prison_priv_check instead of a custom handler "
"called for %d\n", priv));
}
if (!jailed(cred))
return (0);
#ifdef VIMAGE
/*
* Privileges specific to prisons with a virtual network stack.
* There might be a duplicate entry here in case the privilege
* is only granted conditionally in the legacy jail case.
*/
switch (priv) {
#ifdef notyet
/*
* NFS-specific privileges.
*/
case PRIV_NFS_DAEMON:
case PRIV_NFS_LOCKD:
#endif
/*
* Network stack privileges.
*/
case PRIV_NET_BRIDGE:
case PRIV_NET_GRE:
case PRIV_NET_BPF:
case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
case PRIV_NET_ROUTE:
case PRIV_NET_TAP:
case PRIV_NET_SETIFMTU:
case PRIV_NET_SETIFFLAGS:
case PRIV_NET_SETIFCAP:
case PRIV_NET_SETIFDESCR:
case PRIV_NET_SETIFNAME :
case PRIV_NET_SETIFMETRIC:
case PRIV_NET_SETIFPHYS:
case PRIV_NET_SETIFMAC:
case PRIV_NET_SETLANPCP:
case PRIV_NET_ADDMULTI:
case PRIV_NET_DELMULTI:
case PRIV_NET_HWIOCTL:
case PRIV_NET_SETLLADDR:
case PRIV_NET_ADDIFGROUP:
case PRIV_NET_DELIFGROUP:
case PRIV_NET_IFCREATE:
case PRIV_NET_IFDESTROY:
case PRIV_NET_ADDIFADDR:
case PRIV_NET_DELIFADDR:
case PRIV_NET_LAGG:
case PRIV_NET_GIF:
case PRIV_NET_SETIFVNET:
case PRIV_NET_SETIFFIB:
/*
* 802.11-related privileges.
*/
case PRIV_NET80211_GETKEY:
#ifdef notyet
case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
#endif
#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_LOOKUP:
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/phyiscal 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:
if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
cred->cr_prison->pr_enforce_statfs < 2)
return (0);
else
return (EPERM);
/*
* Jails should hold no disposition on the PRIV_VFS_READ_DIR
* policy. priv_check_cred will not specifically allow it, and
* we may want a MAC policy to allow it.
*/
case PRIV_VFS_READ_DIR:
return (0);
/*
* Conditionnaly allow locking (unlocking) physical pages
* in memory.
*/
case PRIV_VM_MLOCK:
case PRIV_VM_MUNLOCK:
if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
return (0);
else
return (EPERM);
/*
* Conditionally allow jailed root to bind reserved ports.
*/
case PRIV_NETINET_RESERVEDPORT:
if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
return (0);
else
return (EPERM);
/*
* Allow jailed root to reuse in-use ports.
*/
case PRIV_NETINET_REUSEPORT:
return (0);
/*
* Allow jailed root to set certain IPv4/6 (option) headers.
*/
case PRIV_NETINET_SETHDROPTS:
return (0);
/*
* Conditionally allow creating raw sockets in jail.
*/
case PRIV_NETINET_RAW:
if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
return (0);
else
return (EPERM);
/*
* Since jail implements its own visibility limits on netstat
* sysctls, allow getcred. This allows identd to work in
* jail.
*/
case PRIV_NETINET_GETCRED:
return (0);
/*
* Allow jailed root to set loginclass.
*/
case PRIV_PROC_SETLOGINCLASS:
return (0);
/*
* Do not allow a process inside a jail to read the kernel
* message buffer unless explicitly permitted.
*/
case PRIV_MSGBUF:
if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
return (0);
return (EPERM);
default:
/*
* In all remaining cases, deny the privilege request. This
* includes almost all network privileges, many system
* configuration privileges.
*/
return (EPERM);
}
}
/*
* Return the part of pr2's name that is relative to pr1, or the whole name
* if it does not directly follow.
*/
char *
prison_name(struct prison *pr1, struct prison *pr2)
{
char *name;
/* Jails see themselves as "0" (if they see themselves at all). */
if (pr1 == pr2)
return "0";
name = pr2->pr_name;
if (prison_ischild(pr1, pr2)) {
/*
* pr1 isn't locked (and allprison_lock may not be either)
* so its length can't be counted on. But the number of dots
* can be counted on - and counted.
*/
for (; pr1 != &prison0; pr1 = pr1->pr_parent)
name = strchr(name, '.') + 1;
}
return (name);
}
/*
* Return the part of pr2's path that is relative to pr1, or the whole path
* if it does not directly follow.
*/
static char *
prison_path(struct prison *pr1, struct prison *pr2)
{
char *path1, *path2;
int len1;
path1 = pr1->pr_path;
path2 = pr2->pr_path;
if (!strcmp(path1, "/"))
return (path2);
len1 = strlen(path1);
if (strncmp(path1, path2, len1))
return (path2);
if (path2[len1] == '\0')
return "/";
if (path2[len1] == '/')
return (path2 + len1);
return (path2);
}
/*
* Jail-related sysctls.
*/
static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Jails");
static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)
{
struct xprison *xp;
struct prison *pr, *cpr;
#ifdef INET
struct in_addr *ip4 = NULL;
int ip4s = 0;
#endif
#ifdef INET6
struct in6_addr *ip6 = NULL;
int ip6s = 0;
#endif
int descend, error;
xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
pr = req->td->td_ucred->cr_prison;
error = 0;
sx_slock(&allprison_lock);
FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
#if defined(INET) || defined(INET6)
again:
#endif
mtx_lock(&cpr->pr_mtx);
#ifdef INET
if (cpr->pr_ip4s > 0) {
if (ip4s < cpr->pr_ip4s) {
ip4s = cpr->pr_ip4s;
mtx_unlock(&cpr->pr_mtx);
ip4 = realloc(ip4, ip4s *
sizeof(struct in_addr), M_TEMP, M_WAITOK);
goto again;
}
bcopy(cpr->pr_ip4, ip4,
cpr->pr_ip4s * sizeof(struct in_addr));
}
#endif
#ifdef INET6
if (cpr->pr_ip6s > 0) {
if (ip6s < cpr->pr_ip6s) {
ip6s = cpr->pr_ip6s;
mtx_unlock(&cpr->pr_mtx);
ip6 = realloc(ip6, ip6s *
sizeof(struct in6_addr), M_TEMP, M_WAITOK);
goto again;
}
bcopy(cpr->pr_ip6, ip6,
cpr->pr_ip6s * sizeof(struct in6_addr));
}
#endif
if (cpr->pr_ref == 0) {
mtx_unlock(&cpr->pr_mtx);
continue;
}
bzero(xp, sizeof(*xp));
xp->pr_version = XPRISON_VERSION;
xp->pr_id = cpr->pr_id;
xp->pr_state = cpr->pr_uref > 0
? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
#ifdef INET
xp->pr_ip4s = cpr->pr_ip4s;
#endif
#ifdef INET6
xp->pr_ip6s = cpr->pr_ip6s;
#endif
mtx_unlock(&cpr->pr_mtx);
error = SYSCTL_OUT(req, xp, sizeof(*xp));
if (error)
break;
#ifdef INET
if (xp->pr_ip4s > 0) {
error = SYSCTL_OUT(req, ip4,
xp->pr_ip4s * sizeof(struct in_addr));
if (error)
break;
}
#endif
#ifdef INET6
if (xp->pr_ip6s > 0) {
error = SYSCTL_OUT(req, ip6,
xp->pr_ip6s * sizeof(struct in6_addr));
if (error)
break;
}
#endif
}
sx_sunlock(&allprison_lock);
free(xp, M_TEMP);
#ifdef INET
free(ip4, M_TEMP);
#endif
#ifdef INET6
free(ip6, M_TEMP);
#endif
return (error);
}
SYSCTL_OID(_security_jail, OID_AUTO, list,
CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_list, "S", "List of active jails");
static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
{
int error, injail;
injail = jailed(req->td->td_ucred);
error = SYSCTL_OUT(req, &injail, sizeof(injail));
return (error);
}
SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_jailed, "I", "Process in jail?");
static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
{
int error, havevnet;
#ifdef VIMAGE
struct ucred *cred = req->td->td_ucred;
havevnet = jailed(cred) && prison_owns_vnet(cred);
#else
havevnet = 0;
#endif
error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
return (error);
}
SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_vnet, "I", "Jail owns vnet?");
#if defined(INET) || defined(INET6)
SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
&jail_max_af_ips, 0,
"Number of IP addresses a jail may have at most per address family (deprecated)");
#endif
/*
* Default parameters for jail(2) compatibility. For historical reasons,
* the sysctl names have varying similarity to the parameter names. Prisons
* just see their own parameters, and can't change them.
*/
static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
{
struct prison *pr;
int allow, error, i;
pr = req->td->td_ucred->cr_prison;
allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
/* Get the current flag value, and convert it to a boolean. */
i = (allow & arg2) ? 1 : 0;
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_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
unsigned 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) && bf->flag != 0;
bf++) {
if (strcmp(bf->name, allow_name) == 0) {
allow_flag = bf->flag;
goto no_add;
}
}
/*
* Find a free bit in prison0's pr_allow, failing if there are none
* (which shouldn't happen as long as we keep track of how many
* potential dynamic flags exist).
*
* Due to per-jail unprivileged process debugging support
* using pr_allow, also verify against PR_ALLOW_ALL_STATIC.
* prison0 may have unprivileged process debugging unset.
*/
for (allow_flag = 1;; allow_flag <<= 1) {
if (allow_flag == 0)
goto no_add;
if (allow_flag & PR_ALLOW_ALL_STATIC)
continue;
if ((prison0.pr_allow & allow_flag) == 0)
break;
}
/*
* Note the parameter in the next open slot in pr_flag_allow.
* Set the flag last so code that checks pr_flag_allow can do so
* without locking.
*/
for (bf = pr_flag_allow; bf->flag != 0; bf++)
if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
/* This should never happen, but is not fatal. */
allow_flag = 0;
goto no_add;
}
prison0.pr_allow |= allow_flag;
bf->name = allow_name;
bf->noname = allow_noname;
bf->flag = allow_flag;
mtx_unlock(&prison0.pr_mtx);
/*
* Create sysctls for the paramter, and the back-compat global
* permission.
*/
parent = prefix
? SYSCTL_ADD_NODE(NULL,
SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
: &sysctl___security_jail_param_allow;
(void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, 0, sysctl_jail_param, "B", descr);
if ((prefix
? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
: asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
#ifndef NO_SYSCTL_DESCR
(void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
descr);
#endif
(void)SYSCTL_ADD_PROC(NULL,
SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
sysctl_jail_default_allow, "I", descr_deprecated);
#ifndef NO_SYSCTL_DESCR
free(descr_deprecated, M_TEMP);
#endif
free(allowed, M_TEMP);
}
return allow_flag;
no_add:
mtx_unlock(&prison0.pr_mtx);
free(allow_name, M_PRISON);
free(allow_noname, M_PRISON);
return allow_flag;
}
/*
* The VFS system will register jail-aware filesystems here. They each get
* a parameter allow.mount.xxxfs and a flag to check when a jailed user
* attempts to mount.
*/
void
prison_add_vfs(struct vfsconf *vfsp)
{
#ifdef NO_SYSCTL_DESCR
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
NULL, NULL);
#else
char *descr;
(void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
vfsp->vfc_name);
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
NULL, descr);
free(descr, M_TEMP);
#endif
}
#ifdef RACCT
void
prison_racct_foreach(void (*callback)(struct racct *racct,
void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
void *arg2, void *arg3)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_slock(&allprison_lock);
if (pre != NULL)
(pre)();
LIST_FOREACH(prr, &allprison_racct, prr_next)
(callback)(prr->prr_racct, arg2, arg3);
if (post != NULL)
(post)();
sx_sunlock(&allprison_lock);
}
static struct prison_racct *
prison_racct_find_locked(const char *name)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
return (NULL);
LIST_FOREACH(prr, &allprison_racct, prr_next) {
if (strcmp(name, prr->prr_name) != 0)
continue;
/* Found prison_racct with a matching name? */
prison_racct_hold(prr);
return (prr);
}
/* Add new prison_racct. */
prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
racct_create(&prr->prr_racct);
strcpy(prr->prr_name, name);
refcount_init(&prr->prr_refcount, 1);
LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
return (prr);
}
struct prison_racct *
prison_racct_find(const char *name)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_xlock(&allprison_lock);
prr = prison_racct_find_locked(name);
sx_xunlock(&allprison_lock);
return (prr);
}
void
prison_racct_hold(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
refcount_acquire(&prr->prr_refcount);
}
static void
prison_racct_free_locked(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
if (refcount_release(&prr->prr_refcount)) {
racct_destroy(&prr->prr_racct);
LIST_REMOVE(prr, prr_next);
free(prr, M_PRISON_RACCT);
}
}
void
prison_racct_free(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_UNLOCKED);
if (refcount_release_if_not_last(&prr->prr_refcount))
return;
sx_xlock(&allprison_lock);
prison_racct_free_locked(prr);
sx_xunlock(&allprison_lock);
}
static void
prison_racct_attach(struct prison *pr)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
prr = prison_racct_find_locked(pr->pr_name);
KASSERT(prr != NULL, ("cannot find prison_racct"));
pr->pr_prison_racct = prr;
}
/*
* Handle jail renaming. From the racct point of view, renaming means
* moving from one prison_racct to another.
*/
static void
prison_racct_modify(struct prison *pr)
{
#ifdef RCTL
struct proc *p;
struct ucred *cred;
#endif
struct prison_racct *oldprr;
ASSERT_RACCT_ENABLED();
sx_slock(&allproc_lock);
sx_xlock(&allprison_lock);
if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
sx_xunlock(&allprison_lock);
sx_sunlock(&allproc_lock);
return;
}
oldprr = pr->pr_prison_racct;
pr->pr_prison_racct = NULL;
prison_racct_attach(pr);
/*
* Move resource utilisation records.
*/
racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
#ifdef RCTL
/*
* Force rctl to reattach rules to processes.
*/
FOREACH_PROC_IN_SYSTEM(p) {
PROC_LOCK(p);
cred = crhold(p->p_ucred);
PROC_UNLOCK(p);
rctl_proc_ucred_changed(p, cred);
crfree(cred);
}
#endif
sx_sunlock(&allproc_lock);
prison_racct_free_locked(oldprr);
sx_xunlock(&allprison_lock);
}
static void
prison_racct_detach(struct prison *pr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_UNLOCKED);
if (pr->pr_prison_racct == NULL)
return;
prison_racct_free(pr->pr_prison_racct);
pr->pr_prison_racct = NULL;
}
#endif /* RACCT */
#ifdef DDB
static void
db_show_prison(struct prison *pr)
{
struct bool_flags *bf;
struct jailsys_flags *jsf;
#if defined(INET) || defined(INET6)
int ii;
#endif
unsigned f;
#ifdef INET
char ip4buf[INET_ADDRSTRLEN];
#endif
#ifdef INET6
char ip6buf[INET6_ADDRSTRLEN];
#endif
db_printf("prison %p:\n", pr);
db_printf(" jid = %d\n", pr->pr_id);
db_printf(" name = %s\n", pr->pr_name);
db_printf(" parent = %p\n", pr->pr_parent);
db_printf(" ref = %d\n", pr->pr_ref);
db_printf(" uref = %d\n", pr->pr_uref);
db_printf(" 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) && bf->flag != 0;
bf++)
if (pr->pr_allow & bf->flag)
db_printf(" %s", bf->name);
db_printf("\n");
db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
db_printf(" host.hostname = %s\n", pr->pr_hostname);
db_printf(" host.domainname = %s\n", pr->pr_domainname);
db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
db_printf(" host.hostid = %lu\n", pr->pr_hostid);
#ifdef INET
db_printf(" ip4s = %d\n", pr->pr_ip4s);
for (ii = 0; ii < pr->pr_ip4s; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip4.addr =" : " ",
inet_ntoa_r(pr->pr_ip4[ii], ip4buf));
#endif
#ifdef INET6
db_printf(" ip6s = %d\n", pr->pr_ip6s);
for (ii = 0; ii < pr->pr_ip6s; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip6.addr =" : " ",
ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
#endif
}
DB_SHOW_COMMAND(prison, db_show_prison_command)
{
struct prison *pr;
if (!have_addr) {
/*
* Show all prisons in the list, and prison0 which is not
* listed.
*/
db_show_prison(&prison0);
if (!db_pager_quit) {
TAILQ_FOREACH(pr, &allprison, pr_list) {
db_show_prison(pr);
if (db_pager_quit)
break;
}
}
return;
}
if (addr == 0)
pr = &prison0;
else {
/* Look for a prison with the ID and with references. */
TAILQ_FOREACH(pr, &allprison, pr_list)
if (pr->pr_id == addr && pr->pr_ref > 0)
break;
if (pr == NULL)
/* Look again, without requiring a reference. */
TAILQ_FOREACH(pr, &allprison, pr_list)
if (pr->pr_id == addr)
break;
if (pr == NULL)
/* Assume address points to a valid prison. */
pr = (struct prison *)addr;
}
db_show_prison(pr);
}
#endif /* DDB */
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