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freebsd-nq/sys/kern/kern_jail.c
Jamie Gritton b38ff370e4 Introduce the extensible jail framework, using the same "name=value" 
interface as nmount(2).  Three new system calls are added:
* jail_set, to create jails and change the parameters of existing jails.
  This replaces jail(2).
* jail_get, to read the parameters of existing jails.  This replaces the
  security.jail.list sysctl.
* jail_remove to kill off a jail's processes and remove the jail.
Most jail parameters may now be changed after creation, and jails may be
set to exist without any attached processes.  The current jail(2) system
call still exists, though it is now a stub to jail_set(2).

Approved by:	bz (mentor)
2009-04-29 21:14:15 +00:00

2721 lines
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/*-
* Copyright (c) 1999 Poul-Henning Kamp.
* Copyright (c) 2008 Bjoern A. Zeeb.
* Copyright (c) 2009 James Gritton.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_mac.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/priv.h>
#include <sys/proc.h>
#include <sys/taskqueue.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/osd.h>
#include <sys/sx.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/vnode.h>
#include <sys/vimage.h>
#include <net/if.h>
#include <netinet/in.h>
#ifdef DDB
#include <ddb/ddb.h>
#ifdef INET6
#include <netinet6/in6_var.h>
#endif /* INET6 */
#endif /* DDB */
#include <security/mac/mac_framework.h>
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
"Jail rules");
int jail_set_hostname_allowed = 1;
SYSCTL_INT(_security_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
&jail_set_hostname_allowed, 0,
"Processes in jail can set their hostnames");
int jail_socket_unixiproute_only = 1;
SYSCTL_INT(_security_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
&jail_socket_unixiproute_only, 0,
"Processes in jail are limited to creating UNIX/IP/route sockets only");
int jail_sysvipc_allowed = 0;
SYSCTL_INT(_security_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
&jail_sysvipc_allowed, 0,
"Processes in jail can use System V IPC primitives");
static int jail_enforce_statfs = 2;
SYSCTL_INT(_security_jail, OID_AUTO, enforce_statfs, CTLFLAG_RW,
&jail_enforce_statfs, 0,
"Processes in jail cannot see all mounted file systems");
int jail_allow_raw_sockets = 0;
SYSCTL_INT(_security_jail, OID_AUTO, allow_raw_sockets, CTLFLAG_RW,
&jail_allow_raw_sockets, 0,
"Prison root can create raw sockets");
int jail_chflags_allowed = 0;
SYSCTL_INT(_security_jail, OID_AUTO, chflags_allowed, CTLFLAG_RW,
&jail_chflags_allowed, 0,
"Processes in jail can alter system file flags");
int jail_mount_allowed = 0;
SYSCTL_INT(_security_jail, OID_AUTO, mount_allowed, CTLFLAG_RW,
&jail_mount_allowed, 0,
"Processes in jail can mount/unmount jail-friendly file systems");
int jail_max_af_ips = 255;
SYSCTL_INT(_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");
/* allprison, lastprid, and prisoncount are protected by allprison_lock. */
struct sx allprison_lock;
SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
int lastprid = 0;
int prisoncount = 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);
#ifdef INET
static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
#endif
#ifdef INET6
static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
#endif
static int sysctl_jail_list(SYSCTL_HANDLER_ARGS);
/* 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
#ifdef INET
static int
qcmp_v4(const void *ip1, const void *ip2)
{
in_addr_t iaa, iab;
/*
* We need to compare in HBO here to get the list sorted as expected
* by the result of the code. Sorting NBO addresses gives you
* interesting results. If you do not understand, do not try.
*/
iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
iab = ntohl(((const struct in_addr *)ip2)->s_addr);
/*
* Do not simply return the difference of the two numbers, the int is
* not wide enough.
*/
if (iaa > iab)
return (1);
else if (iaa < iab)
return (-1);
else
return (0);
}
#endif
#ifdef INET6
static int
qcmp_v6(const void *ip1, const void *ip2)
{
const struct in6_addr *ia6a, *ia6b;
int i, rc;
ia6a = (const struct in6_addr *)ip1;
ia6b = (const struct in6_addr *)ip2;
rc = 0;
for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
rc = 1;
else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
rc = -1;
}
return (rc);
}
#endif
/*
* struct jail_args {
* struct jail *jail;
* };
*/
int
jail(struct thread *td, struct jail_args *uap)
{
struct iovec optiov[10];
struct uio opt;
char *u_path, *u_hostname, *u_name;
#ifdef INET
struct in_addr *u_ip4;
#endif
#ifdef INET6
struct in6_addr *u_ip6;
#endif
uint32_t version;
int error;
error = copyin(uap->jail, &version, sizeof(uint32_t));
if (error)
return (error);
switch (version) {
case 0:
{
/* FreeBSD single IPv4 jails. */
struct jail_v0 j0;
error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
if (error)
return (error);
u_path = malloc(MAXPATHLEN + MAXHOSTNAMELEN, M_TEMP, M_WAITOK);
u_hostname = u_path + MAXPATHLEN;
opt.uio_iov = optiov;
opt.uio_iovcnt = 4;
opt.uio_offset = -1;
opt.uio_resid = -1;
opt.uio_segflg = UIO_SYSSPACE;
opt.uio_rw = UIO_READ;
opt.uio_td = td;
optiov[0].iov_base = "path";
optiov[0].iov_len = sizeof("path");
optiov[1].iov_base = u_path;
error =
copyinstr(j0.path, u_path, MAXPATHLEN, &optiov[1].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
optiov[2].iov_base = "host.hostname";
optiov[2].iov_len = sizeof("host.hostname");
optiov[3].iov_base = u_hostname;
error = copyinstr(j0.hostname, u_hostname, MAXHOSTNAMELEN,
&optiov[3].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
#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 = &j0.ip_number;
j0.ip_number = htonl(j0.ip_number);
optiov[opt.uio_iovcnt].iov_len = sizeof(j0.ip_number);
opt.uio_iovcnt++;
#endif
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. */
struct jail j;
size_t tmplen;
error = copyin(uap->jail, &j, sizeof(struct jail));
if (error)
return (error);
tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
#ifdef INET
if (j.ip4s > jail_max_af_ips)
return (EINVAL);
tmplen += j.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 + j.ip4s);
#else
u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
#endif
#endif
opt.uio_iov = optiov;
opt.uio_iovcnt = 4;
opt.uio_offset = -1;
opt.uio_resid = -1;
opt.uio_segflg = UIO_SYSSPACE;
opt.uio_rw = UIO_READ;
opt.uio_td = td;
optiov[0].iov_base = "path";
optiov[0].iov_len = sizeof("path");
optiov[1].iov_base = u_path;
error =
copyinstr(j.path, u_path, MAXPATHLEN, &optiov[1].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
optiov[2].iov_base = "host.hostname";
optiov[2].iov_len = sizeof("host.hostname");
optiov[3].iov_base = u_hostname;
error = copyinstr(j.hostname, u_hostname, MAXHOSTNAMELEN,
&optiov[3].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
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 =
j.ip4s * sizeof(struct in_addr);
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
break;
}
default:
/* Sci-Fi jails are not supported, sorry. */
return (EINVAL);
}
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
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, *tpr;
struct vnode *root;
char *errmsg, *host, *name, *p, *path;
void *op;
int created, cuflags, error, errmsg_len, errmsg_pos;
int gotslevel, jid, len;
int slevel, vfslocked;
#if defined(INET) || defined(INET6)
int ii;
#endif
#ifdef INET
int ip4s;
#endif
#ifdef INET6
int ip6s;
#endif
unsigned pr_flags, ch_flags;
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);
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
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;
pr_flags = ch_flags = 0;
vfs_flagopt(opts, "persist", &pr_flags, PR_PERSIST);
vfs_flagopt(opts, "nopersist", &ch_flags, PR_PERSIST);
ch_flags |= pr_flags;
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;
}
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 {
if (len == 0 || host[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
#ifdef INET
error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
if (error == ENOENT)
ip4s = -1;
else if (error != 0)
goto done_free;
else if (ip4s & (sizeof(*ip4) - 1)) {
error = EINVAL;
goto done_free;
} else 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.
*/
if (ip4s > 1)
qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 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 = -1;
else if (error != 0)
goto done_free;
else if (ip6s & (sizeof(*ip6) - 1)) {
error = EINVAL;
goto done_free;
} else 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), qcmp_v6);
for (ii = 0; ii < ip6s; ii++) {
if (IN6_IS_ADDR_UNSPECIFIED(&ip6[0])) {
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
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;
}
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done_free;
}
if (len < 2 || (len == 2 && path[0] == '/'))
path = NULL;
else {
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE,
path, td);
error = namei(&nd);
if (error)
goto done_free;
vfslocked = NDHASGIANT(&nd);
root = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (root->v_type != VDIR) {
error = ENOTDIR;
vrele(root);
VFS_UNLOCK_GIANT(vfslocked);
goto done_free;
}
VFS_UNLOCK_GIANT(vfslocked);
}
}
/*
* Grab the allprison lock before letting modules check their
* parameters. Once we have it, do not let go so we'll have a
* consistent view of the OSD list.
*/
sx_xlock(&allprison_lock);
error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
if (error)
goto done_unlock_list;
/* 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_unlock_list;
}
}
/*
* See if we are creating a new record or updating an existing one.
* This abuses the file error codes ENOENT and EEXIST.
*/
cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
if (!cuflags) {
error = EINVAL;
vfs_opterror(opts, "no valid operation (create or update)");
goto done_unlock_list;
}
pr = NULL;
if (jid != 0) {
/* See if a requested jid already exists. */
if (jid < 0) {
error = EINVAL;
vfs_opterror(opts, "negative jid");
goto done_unlock_list;
}
pr = prison_find(jid);
if (pr != NULL) {
/* 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 (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 = pr->pr_name;
}
}
}
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).
*/
if (name != NULL) {
if (name[0] != '\0') {
deadpr = NULL;
name_again:
TAILQ_FOREACH(tpr, &allprison, pr_list) {
if (tpr != pr && tpr->pr_ref > 0 &&
!strcmp(tpr->pr_name, name)) {
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 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) {
created = 1;
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);
goto done_unlock_list;
}
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);
prisoncount++;
pr->pr_id = jid;
if (name == NULL)
name = "";
if (path == NULL) {
path = "/";
root = rootvnode;
vref(root);
}
mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF);
/*
* Allocate a dedicated cpuset for each jail.
* Unlike other initial settings, this may return an erorr.
*/
error = cpuset_create_root(td, &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 other 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++;
}
/* Do final error checking before setting anything. */
error = 0;
#if defined(INET) || defined(INET6)
if (
#ifdef INET
ip4s > 0
#ifdef INET6
||
#endif
#endif
#ifdef INET6
ip6s > 0
#endif
)
/*
* Check for conflicting IP addresses. We permit them if there
* is no more than 1 IP on each jail. If there is a duplicate
* on a jail with more than one IP stop checking and return
* error.
*/
TAILQ_FOREACH(tpr, &allprison, pr_list) {
if (tpr == pr || tpr->pr_uref == 0)
continue;
#ifdef INET
if ((ip4s > 0 && tpr->pr_ip4s > 1) ||
(ip4s > 1 && tpr->pr_ip4s > 0))
for (ii = 0; ii < ip4s; ii++)
if (_prison_check_ip4(tpr,
&ip4[ii]) == 0) {
error = EINVAL;
vfs_opterror(opts,
"IPv4 addresses clash");
goto done_deref_locked;
}
#endif
#ifdef INET6
if ((ip6s > 0 && tpr->pr_ip6s > 1) ||
(ip6s > 1 && tpr->pr_ip6s > 0))
for (ii = 0; ii < ip6s; ii++)
if (_prison_check_ip6(tpr,
&ip6[ii]) == 0) {
error = EINVAL;
vfs_opterror(opts,
"IPv6 addresses clash");
goto done_deref_locked;
}
#endif
}
#endif
if (error == 0 && name != NULL) {
/* Give a default name of the jid. */
if (name[0] == '\0')
snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
else if (strtoul(name, &p, 10) != jid && *p == '\0') {
error = EINVAL;
vfs_opterror(opts, "name cannot be numeric");
}
}
if (error) {
done_deref_locked:
/*
* Some parameter had an error so do not set anything.
* If this is a new jail, it will go away without ever
* having been seen.
*/
prison_deref(pr, created
? PD_LOCKED | PD_LIST_XLOCKED
: PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
goto done_releroot;
}
/* Set the parameters of the prison. */
#ifdef INET
if (ip4s >= 0) {
pr->pr_ip4s = ip4s;
free(pr->pr_ip4, M_PRISON);
pr->pr_ip4 = ip4;
ip4 = NULL;
}
#endif
#ifdef INET6
if (ip6s >= 0) {
pr->pr_ip6s = ip6s;
free(pr->pr_ip6, M_PRISON);
pr->pr_ip6 = ip6;
ip6 = NULL;
}
#endif
if (gotslevel)
pr->pr_securelevel = slevel;
if (name != NULL)
strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
if (path != NULL) {
strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
pr->pr_root = root;
}
if (host != NULL)
strlcpy(pr->pr_host, host, sizeof(pr->pr_host));
/*
* 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.
*/
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);
/* Let the modules do their work. */
sx_downgrade(&allprison_lock);
if (created) {
error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
if (error) {
prison_deref(pr, PD_LIST_SLOCKED);
goto done_errmsg;
}
}
error = osd_jail_call(pr, PR_METHOD_SET, opts);
if (error) {
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;
}
}
/*
* 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);
}
td->td_retval[0] = pr->pr_id;
goto done_errmsg;
done_unlock_list:
sx_xunlock(&allprison_lock);
done_releroot:
if (root != NULL) {
vfslocked = VFS_LOCK_GIANT(root->v_mount);
vrele(root);
VFS_UNLOCK_GIANT(vfslocked);
}
done_errmsg:
if (error) {
vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
if (errmsg_len > 0) {
errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
if (errmsg_pos > 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);
}
}
}
done_free:
#ifdef INET
free(ip4, M_PRISON);
#endif
#ifdef INET6
free(ip6, M_PRISON);
#endif
vfs_freeopts(opts);
return (error);
}
/*
* Sysctl 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, 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), "%d", 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);
}
SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail ID");
SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
SYSCTL_JAIL_PARAM(, cpuset, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RD, MAXPATHLEN, "Jail root path");
SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
"I", "Jail secure level");
SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail persistence");
SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
"B", "Jail is in the process of shutting down");
SYSCTL_JAIL_PARAM_NODE(host, "Jail host info");
SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
"Jail hostname");
#ifdef INET
SYSCTL_JAIL_PARAM_NODE(ip4, "Jail IPv4 address virtualization");
SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
"S,in_addr,a", "Jail IPv4 addresses");
#endif
#ifdef INET6
SYSCTL_JAIL_PARAM_NODE(ip6, "Jail IPv6 address virtualization");
SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
"S,in6_addr,a", "Jail IPv6 addresses");
#endif
/*
* struct jail_get_args {
* struct iovec *iovp;
* unsigned int iovcnt;
* int flags;
* };
*/
int
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 prison *pr;
struct vfsopt *opt;
struct vfsoptlist *opts;
char *errmsg, *name;
int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos;
if (flags & ~JAIL_GET_MASK)
return (EINVAL);
if (jailed(td->td_ucred)) {
/*
* Don't allow a jailed process to see any jails,
* not even its own.
*/
vfs_opterror(opts, "jail not found");
return (ENOENT);
}
/* Get the parameter list. */
error = vfs_buildopts(optuio, &opts);
if (error)
return (error);
errmsg_pos = vfs_getopt_pos(opts, "errmsg");
/*
* 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) {
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(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(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;
error = vfs_setopts(opts, "name", pr->pr_name);
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopt(opts, "cpuset", &pr->pr_cpuset->cs_id,
sizeof(pr->pr_cpuset->cs_id));
if (error != 0 && error != ENOENT)
goto done_deref;
error = vfs_setopts(opts, "path", pr->pr_path);
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_setopts(opts, "host.hostname", pr->pr_host);
if (error != 0 && error != ENOENT)
goto done_deref;
i = pr->pr_flags & PR_PERSIST ? 1 : 0;
error = vfs_setopt(opts, "persist", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done_deref;
i = !i;
error = vfs_setopt(opts, "nopersist", &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;
/* 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
jail_remove(struct thread *td, struct jail_remove_args *uap)
{
struct prison *pr;
struct proc *p;
int deuref, error;
error = priv_check(td, PRIV_JAIL_REMOVE);
if (error)
return (error);
sx_xlock(&allprison_lock);
pr = prison_find(uap->jid);
if (pr == NULL) {
sx_xunlock(&allprison_lock);
return (EINVAL);
}
/* 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;
}
/* If there are no references left, remove the prison now. */
if (pr->pr_ref == 0) {
prison_deref(pr,
deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
return (0);
}
/*
* Keep a temporary reference to make sure this prison sticks around.
*/
pr->pr_ref++;
mtx_unlock(&pr->pr_mtx);
sx_xunlock(&allprison_lock);
/*
* Kill all processes unfortunate enough to be attached to this prison.
*/
sx_slock(&allproc_lock);
LIST_FOREACH(p, &allproc, p_list) {
PROC_LOCK(p);
if (p->p_state != PRS_NEW && p->p_ucred &&
p->p_ucred->cr_prison == pr)
psignal(p, SIGKILL);
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
/* Remove the temporary reference. */
prison_deref(pr, deuref | PD_DEREF);
return (0);
}
/*
* struct jail_attach_args {
* int jid;
* };
*/
int
jail_attach(struct thread *td, struct jail_attach_args *uap)
{
struct prison *pr;
int error;
error = priv_check(td, PRIV_JAIL_ATTACH);
if (error)
return (error);
sx_slock(&allprison_lock);
pr = prison_find(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 vfslocked, 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;
vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
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, 0);
if ((error = change_root(pr->pr_root, td)))
goto e_unlock_giant;
VFS_UNLOCK_GIANT(vfslocked);
newcred = crget();
PROC_LOCK(p);
oldcred = p->p_ucred;
setsugid(p);
crcopy(newcred, oldcred);
newcred->cr_prison = pr;
p->p_ucred = newcred;
PROC_UNLOCK(p);
crfree(oldcred);
return (0);
e_unlock:
VOP_UNLOCK(pr->pr_root, 0);
e_unlock_giant:
VFS_UNLOCK_GIANT(vfslocked);
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);
}
/*
* Look for the named prison. Returns a locked prison or NULL.
*/
struct prison *
prison_find_name(const char *name)
{
struct prison *pr, *deadpr;
sx_assert(&allprison_lock, SX_LOCKED);
again:
deadpr = NULL;
TAILQ_FOREACH(pr, &allprison, pr_list) {
if (!strcmp(pr->pr_name, 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);
}
/*
* 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)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
pr->pr_ref--;
if (pr->pr_ref == 0) {
mtx_unlock(&pr->pr_mtx);
TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
return;
}
mtx_unlock(&pr->pr_mtx);
}
void
prison_free(struct prison *pr)
{
mtx_lock(&pr->pr_mtx);
prison_free_locked(pr);
}
static void
prison_complete(void *context, int pending)
{
prison_deref((struct prison *)context, 0);
}
/*
* 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)
{
int vfslocked;
if (!(flags & PD_LOCKED))
mtx_lock(&pr->pr_mtx);
if (flags & PD_DEUREF) {
pr->pr_uref--;
/* Done if there were only user references to remove. */
if (!(flags & PD_DEREF)) {
mtx_unlock(&pr->pr_mtx);
if (flags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
else if (flags & PD_LIST_XLOCKED)
sx_xunlock(&allprison_lock);
return;
}
}
if (flags & PD_DEREF)
pr->pr_ref--;
/* If the prison still has references, nothing else to do. */
if (pr->pr_ref > 0) {
mtx_unlock(&pr->pr_mtx);
if (flags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
else if (flags & PD_LIST_XLOCKED)
sx_xunlock(&allprison_lock);
return;
}
KASSERT(pr->pr_uref == 0,
("%s: Trying to remove an active prison (jid=%d).", __func__,
pr->pr_id));
mtx_unlock(&pr->pr_mtx);
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);
prisoncount--;
sx_xunlock(&allprison_lock);
if (pr->pr_root != NULL) {
vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
vrele(pr->pr_root);
VFS_UNLOCK_GIANT(vfslocked);
}
mtx_destroy(&pr->pr_mtx);
free(pr->pr_linux, M_PRISON);
#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);
free(pr, M_PRISON);
}
void
prison_hold_locked(struct prison *pr)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
KASSERT(pr->pr_ref > 0,
("Trying to hold dead prison (jid=%d).", 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));
prison_deref(pr, PD_DEUREF | PD_LOCKED);
}
#ifdef INET
/*
* Pass back primary IPv4 address of this jail.
*
* If not jailed return success but do not alter the address. Caller has to
* make sure to initialize it correctly (e.g. INADDR_ANY).
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
* Address returned in NBO.
*/
int
prison_get_ip4(struct ucred *cred, struct in_addr *ia)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip4 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
ia->s_addr = pr->pr_ip4[0].s_addr;
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Make sure our (source) address is set to something meaningful to this
* jail.
*
* Returns 0 if not jailed or if address belongs to jail, EADDRNOTAVAIL if
* the address doesn't belong, or EAFNOSUPPORT if the jail doesn't allow IPv4.
* Address passed in in NBO and returned in NBO.
*/
int
prison_local_ip4(struct ucred *cred, struct in_addr *ia)
{
struct prison *pr;
struct in_addr ia0;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip4 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
ia0.s_addr = ntohl(ia->s_addr);
if (ia0.s_addr == INADDR_LOOPBACK) {
ia->s_addr = pr->pr_ip4[0].s_addr;
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (ia0.s_addr == INADDR_ANY) {
/*
* In case there is only 1 IPv4 address, bind directly.
*/
if (pr->pr_ip4s == 1)
ia->s_addr = pr->pr_ip4[0].s_addr;
mtx_unlock(&pr->pr_mtx);
return (0);
}
error = _prison_check_ip4(pr, ia);
mtx_unlock(&pr->pr_mtx);
return (error);
}
/*
* Rewrite destination address in case we will connect to loopback address.
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
* Address passed in in NBO and returned in NBO.
*/
int
prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip4 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
ia->s_addr = pr->pr_ip4[0].s_addr;
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Return success because nothing had to be changed.
*/
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Check if given address belongs to the jail referenced by cred/prison.
*
* Returns 0 if not jailed or if address belongs to jail, EADDRNOTAVAIL if
* the address doesn't belong, or EAFNOSUPPORT if the jail doesn't allow IPv4.
* Address passed in in NBO.
*/
static int
_prison_check_ip4(struct prison *pr, struct in_addr *ia)
{
int i, a, z, d;
/*
* Check the primary IP.
*/
if (pr->pr_ip4[0].s_addr == ia->s_addr)
return (0);
/*
* All the other IPs are sorted so we can do a binary search.
*/
a = 0;
z = pr->pr_ip4s - 2;
while (a <= z) {
i = (a + z) / 2;
d = qcmp_v4(&pr->pr_ip4[i+1], ia);
if (d > 0)
z = i - 1;
else if (d < 0)
a = i + 1;
else
return (0);
}
return (EADDRNOTAVAIL);
}
int
prison_check_ip4(struct ucred *cred, struct in_addr *ia)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip4 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
error = _prison_check_ip4(pr, ia);
mtx_unlock(&pr->pr_mtx);
return (error);
}
#endif
#ifdef INET6
/*
* Pass back primary IPv6 address for this jail.
*
* If not jailed return success but do not alter the address. Caller has to
* make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
int
prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip6 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Make sure our (source) address is set to something meaningful to this jail.
*
* v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
* when needed while binding.
*
* Returns 0 if not jailed or if address belongs to jail, EADDRNOTAVAIL if
* the address doesn't belong, or EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
int
prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip6 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
if (IN6_IS_ADDR_LOOPBACK(ia6)) {
bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
/*
* In case there is only 1 IPv6 address, and v6only is true,
* then bind directly.
*/
if (v6only != 0 && pr->pr_ip6s == 1)
bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
mtx_unlock(&pr->pr_mtx);
return (0);
}
error = _prison_check_ip6(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (error);
}
/*
* Rewrite destination address in case we will connect to loopback address.
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
int
prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip6 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
if (IN6_IS_ADDR_LOOPBACK(ia6)) {
bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Return success because nothing had to be changed.
*/
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Check if given address belongs to the jail referenced by cred/prison.
*
* Returns 0 if not jailed or if address belongs to jail, EADDRNOTAVAIL if
* the address doesn't belong, or EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
static int
_prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
{
int i, a, z, d;
/*
* Check the primary IP.
*/
if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
return (0);
/*
* All the other IPs are sorted so we can do a binary search.
*/
a = 0;
z = pr->pr_ip6s - 2;
while (a <= z) {
i = (a + z) / 2;
d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
if (d > 0)
z = i - 1;
else if (d < 0)
a = i + 1;
else
return (0);
}
return (EADDRNOTAVAIL);
}
int
prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
if (!jailed(cred))
return (0);
pr = cred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_ip6 == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
error = _prison_check_ip6(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (error);
}
#endif
/*
* 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)
{
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
if (!jailed(cred))
return (0);
error = 0;
switch (af)
{
#ifdef INET
case AF_INET:
if (cred->cr_prison->pr_ip4 == NULL)
error = EAFNOSUPPORT;
break;
#endif
#ifdef INET6
case AF_INET6:
if (cred->cr_prison->pr_ip6 == NULL)
error = EAFNOSUPPORT;
break;
#endif
case AF_LOCAL:
case AF_ROUTE:
break;
default:
if (jail_socket_unixiproute_only)
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Check if given address belongs to the jail referenced by cred (wrapper to
* prison_check_ip[46]).
*
* Returns 0 if not jailed 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, struct sockaddr *sa)
{
#ifdef INET
struct sockaddr_in *sai;
#endif
#ifdef INET6
struct sockaddr_in6 *sai6;
#endif
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
error = 0;
switch (sa->sa_family)
{
#ifdef INET
case AF_INET:
sai = (struct sockaddr_in *)sa;
error = prison_check_ip4(cred, &sai->sin_addr);
break;
#endif
#ifdef INET6
case AF_INET6:
sai6 = (struct sockaddr_in6 *)sa;
error = prison_check_ip6(cred, &sai6->sin6_addr);
break;
#endif
default:
if (jailed(cred) && jail_socket_unixiproute_only)
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
*/
int
prison_check(struct ucred *cred1, struct ucred *cred2)
{
if (jailed(cred1)) {
if (!jailed(cred2))
return (ESRCH);
if (cred2->cr_prison != cred1->cr_prison)
return (ESRCH);
}
return (0);
}
/*
* Return 1 if the passed credential is in a jail, otherwise 0.
*/
int
jailed(struct ucred *cred)
{
return (cred->cr_prison != NULL);
}
/*
* Return the correct hostname for the passed credential.
*/
void
getcredhostname(struct ucred *cred, char *buf, size_t size)
{
INIT_VPROCG(cred->cr_vimage->v_procg);
if (jailed(cred)) {
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(buf, cred->cr_prison->pr_host, size);
mtx_unlock(&cred->cr_prison->pr_mtx);
} else {
mtx_lock(&hostname_mtx);
strlcpy(buf, V_hostname, size);
mtx_unlock(&hostname_mtx);
}
}
/*
* 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;
if (!jailed(cred) || jail_enforce_statfs == 0)
return (0);
pr = cred->cr_prison;
if (pr->pr_root->v_mount == mp)
return (0);
if (jail_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;
if (!jailed(cred) || jail_enforce_statfs == 0)
return;
pr = cred->cr_prison;
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)
{
if (!jailed(cred))
return (0);
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 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:
return (0);
/*
* Depending on the global setting, allow privilege of
* setting system flags.
*/
case PRIV_VFS_SYSFLAGS:
if (jail_chflags_allowed)
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 (jail_mount_allowed)
return (0);
else
return (EPERM);
/*
* Allow jailed root to bind reserved ports and reuse in-use
* ports.
*/
case PRIV_NETINET_RESERVEDPORT:
case PRIV_NETINET_REUSEPORT:
return (0);
/*
* Allow jailed root to set certian IPv4/6 (option) headers.
*/
case PRIV_NETINET_SETHDROPTS:
return (0);
/*
* Conditionally allow creating raw sockets in jail.
*/
case PRIV_NETINET_RAW:
if (jail_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);
default:
/*
* In all remaining cases, deny the privilege request. This
* includes almost all network privileges, many system
* configuration privileges.
*/
return (EPERM);
}
}
static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)
{
struct xprison *xp;
struct prison *pr;
#ifdef INET
struct in_addr *ip4 = NULL;
int ip4s = 0;
#endif
#ifdef INET6
struct in_addr *ip6 = NULL;
int ip6s = 0;
#endif
int error;
if (jailed(req->td->td_ucred))
return (0);
xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
error = 0;
sx_slock(&allprison_lock);
TAILQ_FOREACH(pr, &allprison, pr_list) {
again:
mtx_lock(&pr->pr_mtx);
#ifdef INET
if (pr->pr_ip4s > 0) {
if (ip4s < pr->pr_ip4s) {
ip4s = pr->pr_ip4s;
mtx_unlock(&pr->pr_mtx);
ip4 = realloc(ip4, ip4s *
sizeof(struct in_addr), M_TEMP, M_WAITOK);
goto again;
}
bcopy(pr->pr_ip4, ip4,
pr->pr_ip4s * sizeof(struct in_addr));
}
#endif
#ifdef INET6
if (pr->pr_ip6s > 0) {
if (ip6s < pr->pr_ip6s) {
ip6s = pr->pr_ip6s;
mtx_unlock(&pr->pr_mtx);
ip6 = realloc(ip6, ip6s *
sizeof(struct in6_addr), M_TEMP, M_WAITOK);
goto again;
}
bcopy(pr->pr_ip6, ip6,
pr->pr_ip6s * sizeof(struct in6_addr));
}
#endif
if (pr->pr_ref == 0) {
mtx_unlock(&pr->pr_mtx);
continue;
}
bzero(xp, sizeof(*xp));
xp->pr_version = XPRISON_VERSION;
xp->pr_id = pr->pr_id;
xp->pr_state = pr->pr_uref > 0
? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
strlcpy(xp->pr_path, pr->pr_path, sizeof(xp->pr_path));
strlcpy(xp->pr_host, pr->pr_host, sizeof(xp->pr_host));
strlcpy(xp->pr_name, pr->pr_name, sizeof(xp->pr_name));
#ifdef INET
xp->pr_ip4s = pr->pr_ip4s;
#endif
#ifdef INET6
xp->pr_ip6s = pr->pr_ip6s;
#endif
mtx_unlock(&pr->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?");
#ifdef DDB
static void
db_show_prison(struct prison *pr)
{
#if defined(INET) || defined(INET6)
int ii;
#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(" 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);
db_printf(" root = %p\n", pr->pr_root);
db_printf(" securelevel = %d\n", pr->pr_securelevel);
db_printf(" flags = %x", pr->pr_flags);
if (pr->pr_flags & PR_PERSIST)
db_printf(" persist");
db_printf("\n");
db_printf(" host.hostname = %s\n", pr->pr_host);
#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 =" : " ",
inet_ntoa(pr->pr_ip4[ii]));
#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 =" : " ",
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. */
TAILQ_FOREACH(pr, &allprison, pr_list) {
db_show_prison(pr);
if (db_pager_quit)
break;
}
return;
}
/* 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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