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freebsd-nq/sys/kern/kern_jail.c
Marko Zec 29b02909eb Introduce a new virtualization container, provisionally named vprocg, to hold 
virtualized instances of hostname and domainname, as well as a new top-level
virtualization struct vimage, which holds pointers to struct vnet and struct
vprocg.  Struct vprocg is likely to become replaced in the near future with
a new jail management API import.

As a consequence of this change, change struct ucred to point to a struct
vimage, instead of directly pointing to a vnet.

Merge vnet / vimage / ucred refcounting infrastructure from p4 / vimage
branch.

Permit kldload / kldunload operations to be executed only from the default
vimage context.

This change should have no functional impact on nooptions VIMAGE kernel
builds.

Reviewed by:	bz
Approved by:	julian (mentor)
2009-05-08 14:11:06 +00:00

2724 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);
#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);
}
#ifdef VIMAGE
if (cred2->cr_vimage->v_procg != cred1->cr_vimage->v_procg)
return (ESRCH);
#endif
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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