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freebsd-src/sys/kern/kern_jail.c
Alfredo Mazzinghi 61cc4830a7 Abstract UIO allocation and deallocation. 
Introduce the allocuio() and freeuio() functions to allocate and
deallocate struct uio. This hides the actual allocator interface, so it
is easier to modify the sub-allocation layout of struct uio and the
corresponding iovec array.

Obtained from:	CheriBSD
Reviewed by:	kib, markj
MFC after:	2 weeks
Sponsored by:	CHaOS, EPSRC grant EP/V000292/1
Differential Revision:	https://reviews.freebsd.org/D43711
2024-02-10 11:38:04 -05:00

5089 lines
127 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* 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>
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_nfs.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/sysproto.h>
#include <sys/malloc.h>
#include <sys/osd.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/epoch.h>
#include <sys/taskqueue.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/racct.h>
#include <sys/rctl.h>
#include <sys/refcount.h>
#include <sys/sx.h>
#include <sys/sysent.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/uuid.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/vnet.h>
#include <netinet/in.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif /* DDB */
#include <security/mac/mac_framework.h>
#define PRISON0_HOSTUUID_MODULE "hostuuid"
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
#ifdef INET
#ifdef INET6
#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
#else
#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
#endif
#else /* !INET */
#ifdef INET6
#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
#else
#define _PR_IP_SADDRSEL 0
#endif
#endif
/* prison0 describes what is "real" about the system. */
struct prison prison0 = {
.pr_id = 0,
.pr_name = "0",
.pr_ref = 1,
.pr_uref = 1,
.pr_path = "/",
.pr_securelevel = -1,
.pr_devfs_rsnum = 0,
.pr_state = PRISON_STATE_ALIVE,
.pr_childmax = JAIL_MAX,
.pr_hostuuid = DEFAULT_HOSTUUID,
.pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
#ifdef VIMAGE
.pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
#else
.pr_flags = PR_HOST|_PR_IP_SADDRSEL,
#endif
.pr_allow = PR_ALLOW_ALL_STATIC,
};
MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
struct bool_flags {
const char *name;
const char *noname;
volatile u_int flag;
};
struct jailsys_flags {
const char *name;
unsigned disable;
unsigned new;
};
/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
struct sx allprison_lock;
SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
LIST_HEAD(, prison_racct) allprison_racct;
int lastprid = 0;
int lastdeadid = 0;
static int get_next_prid(struct prison **insprp);
static int get_next_deadid(struct prison **insprp);
static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
static void prison_complete(void *context, int pending);
static void prison_deref(struct prison *pr, int flags);
static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
static int prison_lock_xlock(struct prison *pr, int flags);
static void prison_cleanup(struct prison *pr);
static void prison_free_not_last(struct prison *pr);
static void prison_proc_free_not_last(struct prison *pr);
static void prison_proc_relink(struct prison *opr, struct prison *npr,
struct proc *p);
static void prison_set_allow_locked(struct prison *pr, unsigned flag,
int enable);
static char *prison_path(struct prison *pr1, struct prison *pr2);
#ifdef RACCT
static void prison_racct_attach(struct prison *pr);
static void prison_racct_modify(struct prison *pr);
static void prison_racct_detach(struct prison *pr);
#endif
/* Flags for prison_deref */
#define PD_DEREF 0x01 /* Decrement pr_ref */
#define PD_DEUREF 0x02 /* Decrement pr_uref */
#define PD_KILL 0x04 /* Remove jail, kill processes, etc */
#define PD_LOCKED 0x10 /* pr_mtx is held */
#define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
#define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
#define PD_OP_FLAGS 0x07 /* Operation flags */
#define PD_LOCK_FLAGS 0x70 /* Lock status flags */
/*
* Parameter names corresponding to PR_* flag values. Size values are for kvm
* as we cannot figure out the size of a sparse array, or an array without a
* terminating entry.
*/
static struct bool_flags pr_flag_bool[] = {
{"persist", "nopersist", PR_PERSIST},
#ifdef INET
{"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
#endif
#ifdef INET6
{"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
#endif
};
const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
static struct jailsys_flags pr_flag_jailsys[] = {
{"host", 0, PR_HOST},
#ifdef VIMAGE
{"vnet", 0, PR_VNET},
#endif
#ifdef INET
{"ip4", PR_IP4_USER, PR_IP4_USER},
#endif
#ifdef INET6
{"ip6", PR_IP6_USER, PR_IP6_USER},
#endif
};
const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
/*
* Make this array full-size so dynamic parameters can be added.
* It is protected by prison0.mtx, but lockless reading is allowed
* with an atomic check of the flag values.
*/
static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
{"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
{"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
{"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
{"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
{"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
{"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
{"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
{"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
{"allow.reserved_ports", "allow.noreserved_ports",
PR_ALLOW_RESERVED_PORTS},
{"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
{"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
PR_ALLOW_UNPRIV_DEBUG},
{"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
#ifdef VIMAGE
{"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD},
#endif
{"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR},
};
static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
#define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
PR_ALLOW_RESERVED_PORTS | \
PR_ALLOW_UNPRIV_DEBUG | \
PR_ALLOW_SUSER)
#define JAIL_DEFAULT_ENFORCE_STATFS 2
#define JAIL_DEFAULT_DEVFS_RSNUM 0
static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
#if defined(INET) || defined(INET6)
static unsigned jail_max_af_ips = 255;
#endif
/*
* Initialize the parts of prison0 that can't be static-initialized with
* constants. This is called from proc0_init() after creating thread0 cpuset.
*/
void
prison0_init(void)
{
uint8_t *file, *data;
size_t size;
char buf[sizeof(prison0.pr_hostuuid)];
bool valid;
prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
prison0.pr_osreldate = osreldate;
strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
/* If we have a preloaded hostuuid, use it. */
file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
if (file != NULL) {
data = preload_fetch_addr(file);
size = preload_fetch_size(file);
if (data != NULL) {
/*
* The preloaded data may include trailing whitespace, almost
* certainly a newline; skip over any whitespace or
* non-printable characters to be safe.
*/
while (size > 0 && data[size - 1] <= 0x20) {
size--;
}
valid = false;
/*
* Not NUL-terminated when passed from loader, but
* validate_uuid requires that due to using sscanf (as
* does the subsequent strlcpy, since it still reads
* past the given size to return the true length);
* bounce to a temporary buffer to fix.
*/
if (size >= sizeof(buf))
goto done;
memcpy(buf, data, size);
buf[size] = '\0';
if (validate_uuid(buf, size, NULL, 0) != 0)
goto done;
valid = true;
(void)strlcpy(prison0.pr_hostuuid, buf,
sizeof(prison0.pr_hostuuid));
done:
if (bootverbose && !valid) {
printf("hostuuid: preload data malformed: '%.*s'\n",
(int)size, data);
}
}
}
if (bootverbose)
printf("hostuuid: using %s\n", prison0.pr_hostuuid);
}
/*
* struct jail_args {
* struct jail *jail;
* };
*/
int
sys_jail(struct thread *td, struct jail_args *uap)
{
uint32_t version;
int error;
struct jail j;
error = copyin(uap->jail, &version, sizeof(uint32_t));
if (error)
return (error);
switch (version) {
case 0:
{
struct jail_v0 j0;
/* FreeBSD single IPv4 jails. */
bzero(&j, sizeof(struct jail));
error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
if (error)
return (error);
j.version = j0.version;
j.path = j0.path;
j.hostname = j0.hostname;
j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
break;
}
case 1:
/*
* Version 1 was used by multi-IPv4 jail implementations
* that never made it into the official kernel.
*/
return (EINVAL);
case 2: /* JAIL_API_VERSION */
/* FreeBSD multi-IPv4/IPv6,noIP jails. */
error = copyin(uap->jail, &j, sizeof(struct jail));
if (error)
return (error);
break;
default:
/* Sci-Fi jails are not supported, sorry. */
return (EINVAL);
}
return (kern_jail(td, &j));
}
int
kern_jail(struct thread *td, struct jail *j)
{
struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
#ifdef INET
+ 1
#endif
#ifdef INET6
+ 1
#endif
)];
struct uio opt;
char *u_path, *u_hostname, *u_name;
struct bool_flags *bf;
#ifdef INET
uint32_t ip4s;
struct in_addr *u_ip4;
#endif
#ifdef INET6
struct in6_addr *u_ip6;
#endif
size_t tmplen;
int error, enforce_statfs;
bzero(&optiov, sizeof(optiov));
opt.uio_iov = optiov;
opt.uio_iovcnt = 0;
opt.uio_offset = -1;
opt.uio_resid = -1;
opt.uio_segflg = UIO_SYSSPACE;
opt.uio_rw = UIO_READ;
opt.uio_td = td;
/* Set permissions for top-level jails from sysctls. */
if (!jailed(td->td_ucred)) {
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++) {
optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
(jail_default_allow & bf->flag)
? bf->name : bf->noname);
optiov[opt.uio_iovcnt].iov_len =
strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
opt.uio_iovcnt += 2;
}
optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
opt.uio_iovcnt++;
enforce_statfs = jail_default_enforce_statfs;
optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
opt.uio_iovcnt++;
}
tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
#ifdef INET
ip4s = (j->version == 0) ? 1 : j->ip4s;
if (ip4s > jail_max_af_ips)
return (EINVAL);
tmplen += ip4s * sizeof(struct in_addr);
#else
if (j->ip4s > 0)
return (EINVAL);
#endif
#ifdef INET6
if (j->ip6s > jail_max_af_ips)
return (EINVAL);
tmplen += j->ip6s * sizeof(struct in6_addr);
#else
if (j->ip6s > 0)
return (EINVAL);
#endif
u_path = malloc(tmplen, M_TEMP, M_WAITOK);
u_hostname = u_path + MAXPATHLEN;
u_name = u_hostname + MAXHOSTNAMELEN;
#ifdef INET
u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
#endif
#ifdef INET6
#ifdef INET
u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
#else
u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
#endif
#endif
optiov[opt.uio_iovcnt].iov_base = "path";
optiov[opt.uio_iovcnt].iov_len = sizeof("path");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_path;
error = copyinstr(j->path, u_path, MAXPATHLEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = "host.hostname";
optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_hostname;
error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
if (j->jailname != NULL) {
optiov[opt.uio_iovcnt].iov_base = "name";
optiov[opt.uio_iovcnt].iov_len = sizeof("name");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_name;
error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
&optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
}
#ifdef INET
optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_ip4;
optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
if (j->version == 0)
u_ip4->s_addr = j->ip4s;
else {
error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
}
opt.uio_iovcnt++;
#endif
#ifdef INET6
optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
opt.uio_iovcnt++;
optiov[opt.uio_iovcnt].iov_base = u_ip6;
optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
if (error) {
free(u_path, M_TEMP);
return (error);
}
opt.uio_iovcnt++;
#endif
KASSERT(opt.uio_iovcnt <= nitems(optiov),
("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
free(u_path, M_TEMP);
return (error);
}
/*
* struct jail_set_args {
* struct iovec *iovp;
* unsigned int iovcnt;
* int flags;
* };
*/
int
sys_jail_set(struct thread *td, struct jail_set_args *uap)
{
struct uio *auio;
int error;
/* Check that we have an even number of iovecs. */
if (uap->iovcnt & 1)
return (EINVAL);
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
if (error)
return (error);
error = kern_jail_set(td, auio, uap->flags);
freeuio(auio);
return (error);
}
#if defined(INET) || defined(INET6)
typedef int prison_addr_cmp_t(const void *, const void *);
typedef bool prison_addr_valid_t(const void *);
static const struct pr_family {
size_t size;
prison_addr_cmp_t *cmp;
prison_addr_valid_t *valid;
int ip_flag;
} pr_families[PR_FAMILY_MAX] = {
#ifdef INET
[PR_INET] = {
.size = sizeof(struct in_addr),
.cmp = prison_qcmp_v4,
.valid = prison_valid_v4,
.ip_flag = PR_IP4_USER,
},
#endif
#ifdef INET6
[PR_INET6] = {
.size = sizeof(struct in6_addr),
.cmp = prison_qcmp_v6,
.valid = prison_valid_v6,
.ip_flag = PR_IP6_USER,
},
#endif
};
/*
* Network address lists (pr_addrs) allocation for jails. The addresses
* are accessed locklessly by the network stack, thus need to be protected by
* the network epoch.
*/
struct prison_ip {
struct epoch_context ctx;
uint32_t ips;
#ifdef FUTURE_C
/*
* XXX Variable-length automatic arrays in union may be
* supported in future C.
*/
union {
char pr_ip[];
struct in_addr pr_ip4[];
struct in6_addr pr_ip6[];
};
#else /* No future C :( */
char pr_ip[];
#endif
};
static char *
PR_IP(struct prison_ip *pip, const pr_family_t af, int idx)
{
MPASS(pip);
MPASS(af < PR_FAMILY_MAX);
MPASS(idx >= 0 && idx < pip->ips);
return (pip->pr_ip + pr_families[af].size * idx);
}
static struct prison_ip *
prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
{
struct prison_ip *pip;
pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
M_PRISON, flags);
if (pip != NULL)
pip->ips = cnt;
return (pip);
}
/*
* Allocate and copyin user supplied address list, sorting and validating.
* kern_jail_set() helper.
*/
static struct prison_ip *
prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
{
prison_addr_cmp_t *const cmp = pr_families[af].cmp;
const size_t size = pr_families[af].size;
struct prison_ip *pip;
pip = prison_ip_alloc(af, cnt, M_WAITOK);
bcopy(op, pip->pr_ip, cnt * size);
/*
* IP addresses are all sorted but ip[0] to preserve
* the primary IP address as given from userland.
* This special IP is used for unbound outgoing
* connections as well for "loopback" traffic in case
* source address selection cannot find any more fitting
* address to connect from.
*/
if (cnt > 1)
qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp);
/*
* Check for duplicate addresses and do some simple
* zero and broadcast checks. If users give other bogus
* addresses it is their problem.
*/
for (int i = 0; i < cnt; i++) {
if (!pr_families[af].valid(PR_IP(pip, af, i))) {
free(pip, M_PRISON);
return (NULL);
}
if (i + 1 < cnt &&
(cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 ||
cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) {
free(pip, M_PRISON);
return (NULL);
}
}
return (pip);
}
/*
* Allocate and dup parent prison address list.
* kern_jail_set() helper.
*/
static void
prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
{
const struct prison_ip *ppip = ppr->pr_addrs[af];
struct prison_ip *pip;
if (ppip != NULL) {
pip = prison_ip_alloc(af, ppip->ips, M_WAITOK);
bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size);
pr->pr_addrs[af] = pip;
}
}
/*
* Make sure the new set of IP addresses is a subset of the parent's list.
* Don't worry about the parent being unlocked, as any setting is done with
* allprison_lock held.
* kern_jail_set() helper.
*/
static bool
prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip,
const pr_family_t af)
{
prison_addr_cmp_t *const cmp = pr_families[af].cmp;
int i, j;
if (ppip == NULL)
return (false);
for (i = 0; i < ppip->ips; i++)
if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0)
break;
if (i == ppip->ips)
/* Main address not present in parent. */
return (false);
if (pip->ips > 1) {
for (i = j = 1; i < pip->ips; i++) {
if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0)
/* Equals to parent primary address. */
continue;
for (; j < ppip->ips; j++)
if (cmp(PR_IP(pip, af, i),
PR_IP(ppip, af, j)) == 0)
break;
if (j == ppip->ips)
break;
}
if (j == ppip->ips)
/* Address not present in parent. */
return (false);
}
return (true);
}
/*
* Check for conflicting IP addresses. We permit them if there is no more
* than one IP on each jail. If there is a duplicate on a jail with more
* than one IP stop checking and return error.
* kern_jail_set() helper.
*/
static bool
prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
struct prison_ip *pip, pr_family_t af)
{
const struct prison *tppr, *tpr;
int descend;
#ifdef VIMAGE
for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
if (tppr->pr_flags & PR_VNET)
break;
#else
tppr = &prison0;
#endif
FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
if (tpr == pr ||
#ifdef VIMAGE
(tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
#endif
!prison_isalive(tpr)) {
descend = 0;
continue;
}
if (!(tpr->pr_flags & pr_families[af].ip_flag))
continue;
descend = 0;
if (tpr->pr_addrs[af] == NULL ||
(pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
continue;
for (int i = 0; i < pip->ips; i++)
if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0)
return (false);
}
return (true);
}
_Static_assert(offsetof(struct prison_ip, ctx) == 0,
"prison must start with epoch context");
static void
prison_ip_free_deferred(epoch_context_t ctx)
{
free(ctx, M_PRISON);
}
static void
prison_ip_free(struct prison_ip *pip)
{
if (pip != NULL)
NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
}
static void
prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
{
struct prison_ip **mem, *old;
mtx_assert(&pr->pr_mtx, MA_OWNED);
mem = &pr->pr_addrs[af];
old = *mem;
atomic_store_ptr(mem, new);
prison_ip_free(old);
}
/*
* Restrict a prison's IP address list with its parent's, possibly replacing
* it. Return true if succeed, otherwise should redo.
* kern_jail_set() helper.
*/
static bool
prison_ip_restrict(struct prison *pr, const pr_family_t af,
struct prison_ip **newp)
{
struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
struct prison_ip *pip = pr->pr_addrs[af];
int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
const size_t size = pr_families[af].size;
struct prison_ip *new = newp != NULL ? *newp : NULL;
uint32_t ips;
mtx_assert(&pr->pr_mtx, MA_OWNED);
/*
* Due to epoch-synchronized access to the IP address lists we always
* allocate a new list even if the old one has enough space. We could
* atomically update an IPv4 address inside a list, but that would
* screw up sorting, and in case of IPv6 we can't even atomically write
* one.
*/
if (ppip == NULL) {
if (pip != NULL)
prison_ip_set(pr, af, NULL);
return (true);
}
if (!(pr->pr_flags & pr_families[af].ip_flag)) {
if (new == NULL) {
new = prison_ip_alloc(af, ppip->ips, M_NOWAIT);
if (new == NULL)
return (false); /* Redo */
}
/* This has no user settings, so just copy the parent's list. */
MPASS(new->ips == ppip->ips);
bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size);
prison_ip_set(pr, af, new);
if (newp != NULL)
*newp = NULL; /* Used */
} else if (pip != NULL) {
/* Remove addresses that aren't in the parent. */
int i;
i = 0; /* index in pip */
ips = 0; /* index in new */
if (new == NULL) {
new = prison_ip_alloc(af, pip->ips, M_NOWAIT);
if (new == NULL)
return (false); /* Redo */
}
for (int pi = 0; pi < ppip->ips; pi++)
if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) {
/* Found our primary address in parent. */
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
ips++;
break;
}
for (int pi = 1; i < pip->ips; ) {
/* Check against primary, which is unsorted. */
if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) {
/* Matches parent's primary address. */
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
ips++;
continue;
}
/* The rest are sorted. */
switch (pi >= ppip->ips ? -1 :
cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) {
case -1:
i++;
break;
case 0:
bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
size);
i++;
pi++;
ips++;
break;
case 1:
pi++;
break;
}
}
if (ips == 0) {
if (newp == NULL || *newp == NULL)
prison_ip_free(new);
new = NULL;
} else {
/* Shrink to real size */
KASSERT((new->ips >= ips),
("Out-of-bounds write to prison_ip %p", new));
new->ips = ips;
}
prison_ip_set(pr, af, new);
if (newp != NULL)
*newp = NULL; /* Used */
}
return (true);
}
/*
* Fast-path check if an address belongs to a prison.
*/
int
prison_ip_check(const struct prison *pr, const pr_family_t af,
const void *addr)
{
int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
struct prison_ip *pip;
int i, a, z, d;
MPASS(mtx_owned(&pr->pr_mtx) ||
in_epoch(net_epoch_preempt) ||
sx_xlocked(&allprison_lock));
pip = atomic_load_ptr(&pr->pr_addrs[af]);
if (__predict_false(pip == NULL))
return (EAFNOSUPPORT);
/* Check the primary IP. */
if (cmp(PR_IP(pip, af, 0), addr) == 0)
return (0);
/*
* All the other IPs are sorted so we can do a binary search.
*/
a = 0;
z = pip->ips - 2;
while (a <= z) {
i = (a + z) / 2;
d = cmp(PR_IP(pip, af, i + 1), addr);
if (d > 0)
z = i - 1;
else if (d < 0)
a = i + 1;
else
return (0);
}
return (EADDRNOTAVAIL);
}
/*
* Grab primary IP. Historically required mutex, but nothing prevents
* us to support epoch-protected access. Is it used in fast path?
* in{6}_jail.c helper
*/
const void *
prison_ip_get0(const struct prison *pr, const pr_family_t af)
{
const struct prison_ip *pip = pr->pr_addrs[af];
mtx_assert(&pr->pr_mtx, MA_OWNED);
MPASS(pip);
return (pip->pr_ip);
}
u_int
prison_ip_cnt(const struct prison *pr, const pr_family_t af)
{
return (pr->pr_addrs[af]->ips);
}
#endif /* defined(INET) || defined(INET6) */
int
kern_jail_set(struct thread *td, struct uio *optuio, int flags)
{
struct nameidata nd;
#ifdef INET
struct prison_ip *ip4;
#endif
#ifdef INET6
struct prison_ip *ip6;
#endif
struct vfsopt *opt;
struct vfsoptlist *opts;
struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr;
struct vnode *root;
char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
char *g_path, *osrelstr;
struct bool_flags *bf;
struct jailsys_flags *jsf;
#if defined(INET) || defined(INET6)
void *op;
#endif
unsigned long hid;
size_t namelen, onamelen, pnamelen;
int created, cuflags, descend, drflags, enforce;
int error, errmsg_len, errmsg_pos;
int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
int deadid, jid, jsys, len, level;
int childmax, osreldt, rsnum, slevel;
#ifdef INET
int ip4s;
bool redo_ip4;
#endif
#ifdef INET6
int ip6s;
bool redo_ip6;
#endif
uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
uint64_t pr_allow_diff;
unsigned tallow;
char numbuf[12];
error = priv_check(td, PRIV_JAIL_SET);
if (!error && (flags & JAIL_ATTACH))
error = priv_check(td, PRIV_JAIL_ATTACH);
if (error)
return (error);
mypr = td->td_ucred->cr_prison;
if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
return (EPERM);
if (flags & ~JAIL_SET_MASK)
return (EINVAL);
/*
* Check all the parameters before committing to anything. Not all
* errors can be caught early, but we may as well try. Also, this
* takes care of some expensive stuff (path lookup) before getting
* the allprison lock.
*
* XXX Jails are not filesystems, and jail parameters are not mount
* options. But it makes more sense to re-use the vfsopt code
* than duplicate it under a different name.
*/
error = vfs_buildopts(optuio, &opts);
if (error)
return (error);
#ifdef INET
ip4 = NULL;
#endif
#ifdef INET6
ip6 = NULL;
#endif
g_path = NULL;
cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
if (!cuflags) {
error = EINVAL;
vfs_opterror(opts, "no valid operation (create or update)");
goto done_errmsg;
}
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
if (error == ENOENT)
jid = 0;
else if (error != 0)
goto done_free;
error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
if (error == ENOENT)
gotslevel = 0;
else if (error != 0)
goto done_free;
else
gotslevel = 1;
error =
vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
if (error == ENOENT)
gotchildmax = 0;
else if (error != 0)
goto done_free;
else
gotchildmax = 1;
error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
if (error == ENOENT)
gotenforce = 0;
else if (error != 0)
goto done_free;
else if (enforce < 0 || enforce > 2) {
error = EINVAL;
goto done_free;
} else
gotenforce = 1;
error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
if (error == ENOENT)
gotrsnum = 0;
else if (error != 0)
goto done_free;
else
gotrsnum = 1;
pr_flags = ch_flags = 0;
for (bf = pr_flag_bool;
bf < pr_flag_bool + nitems(pr_flag_bool);
bf++) {
vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
}
ch_flags |= pr_flags;
for (jsf = pr_flag_jailsys;
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
jsf++) {
error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
if (error == ENOENT)
continue;
if (error != 0)
goto done_free;
switch (jsys) {
case JAIL_SYS_DISABLE:
if (!jsf->disable) {
error = EINVAL;
goto done_free;
}
pr_flags |= jsf->disable;
break;
case JAIL_SYS_NEW:
pr_flags |= jsf->new;
break;
case JAIL_SYS_INHERIT:
break;
default:
error = EINVAL;
goto done_free;
}
ch_flags |= jsf->new | jsf->disable;
}
if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
&& !(pr_flags & PR_PERSIST)) {
error = EINVAL;
vfs_opterror(opts, "new jail must persist or attach");
goto done_errmsg;
}
#ifdef VIMAGE
if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
error = EINVAL;
vfs_opterror(opts, "vnet cannot be changed after creation");
goto done_errmsg;
}
#endif
#ifdef INET
if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
error = EINVAL;
vfs_opterror(opts, "ip4 cannot be changed after creation");
goto done_errmsg;
}
#endif
#ifdef INET6
if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
error = EINVAL;
vfs_opterror(opts, "ip6 cannot be changed after creation");
goto done_errmsg;
}
#endif
pr_allow = ch_allow = 0;
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++) {
vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
}
ch_allow |= pr_allow;
error = vfs_getopt(opts, "name", (void **)&name, &len);
if (error == ENOENT)
name = NULL;
else if (error != 0)
goto done_free;
else {
if (len == 0 || name[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
if (error == ENOENT)
host = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || host[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
if (error == ENOENT)
domain = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || domain[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > MAXHOSTNAMELEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
if (error == ENOENT)
uuid = NULL;
else if (error != 0)
goto done_free;
else {
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
if (len == 0 || uuid[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len > HOSTUUIDLEN) {
error = ENAMETOOLONG;
goto done_free;
}
}
#ifdef COMPAT_FREEBSD32
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
uint32_t hid32;
error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
hid = hid32;
} else
#endif
error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
if (error == ENOENT)
gothid = 0;
else if (error != 0)
goto done_free;
else {
gothid = 1;
ch_flags |= PR_HOST;
pr_flags |= PR_HOST;
}
#ifdef INET
error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
if (error == ENOENT)
ip4s = 0;
else if (error != 0)
goto done_free;
else if (ip4s & (sizeof(struct in_addr) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP4_USER;
pr_flags |= PR_IP4_USER;
if (ip4s > 0) {
ip4s /= sizeof(struct in_addr);
if (ip4s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv4 addresses");
goto done_errmsg;
}
ip4 = prison_ip_copyin(PR_INET, op, ip4s);
if (ip4 == NULL) {
error = EINVAL;
goto done_free;
}
}
}
#endif
#ifdef INET6
error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
if (error == ENOENT)
ip6s = 0;
else if (error != 0)
goto done_free;
else if (ip6s & (sizeof(struct in6_addr) - 1)) {
error = EINVAL;
goto done_free;
} else {
ch_flags |= PR_IP6_USER;
pr_flags |= PR_IP6_USER;
if (ip6s > 0) {
ip6s /= sizeof(struct in6_addr);
if (ip6s > jail_max_af_ips) {
error = EINVAL;
vfs_opterror(opts, "too many IPv6 addresses");
goto done_errmsg;
}
ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
if (ip6 == NULL) {
error = EINVAL;
goto done_free;
}
}
}
#endif
#if defined(VIMAGE) && (defined(INET) || defined(INET6))
if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
error = EINVAL;
vfs_opterror(opts,
"vnet jails cannot have IP address restrictions");
goto done_errmsg;
}
#endif
error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
if (error == ENOENT)
osrelstr = NULL;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"osrelease cannot be changed after creation");
goto done_errmsg;
}
if (len == 0 || osrelstr[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
if (len >= OSRELEASELEN) {
error = ENAMETOOLONG;
vfs_opterror(opts,
"osrelease string must be 1-%d bytes long",
OSRELEASELEN - 1);
goto done_errmsg;
}
}
error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
if (error == ENOENT)
osreldt = 0;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"osreldate cannot be changed after creation");
goto done_errmsg;
}
if (osreldt == 0) {
error = EINVAL;
vfs_opterror(opts, "osreldate cannot be 0");
goto done_errmsg;
}
}
root = NULL;
error = vfs_getopt(opts, "path", (void **)&path, &len);
if (error == ENOENT)
path = NULL;
else if (error != 0)
goto done_free;
else {
if (flags & JAIL_UPDATE) {
error = EINVAL;
vfs_opterror(opts,
"path cannot be changed after creation");
goto done_errmsg;
}
if (len == 0 || path[len - 1] != '\0') {
error = EINVAL;
goto done_free;
}
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
error = namei(&nd);
if (error)
goto done_free;
root = nd.ni_vp;
NDFREE_PNBUF(&nd);
g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
strlcpy(g_path, path, MAXPATHLEN);
error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
if (error == 0) {
path = g_path;
} else {
/* exit on other errors */
goto done_free;
}
if (root->v_type != VDIR) {
error = ENOTDIR;
vput(root);
goto done_free;
}
VOP_UNLOCK(root);
}
/*
* Find the specified jail, or at least its parent.
* This abuses the file error codes ENOENT and EEXIST.
*/
pr = NULL;
inspr = NULL;
deadpr = NULL;
if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
namelc = strrchr(name, '.');
jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
if (*p != '\0')
jid = 0;
}
sx_xlock(&allprison_lock);
drflags = PD_LIST_XLOCKED;
ppr = mypr;
if (!prison_isalive(ppr)) {
/* This jail is dying. This process will surely follow. */
error = EAGAIN;
goto done_deref;
}
if (jid != 0) {
if (jid < 0) {
error = EINVAL;
vfs_opterror(opts, "negative jid");
goto done_deref;
}
/*
* See if a requested jid already exists. Keep track of
* where it can be inserted later.
*/
TAILQ_FOREACH(inspr, &allprison, pr_list) {
if (inspr->pr_id < jid)
continue;
if (inspr->pr_id > jid)
break;
if (prison_isalive(inspr)) {
pr = inspr;
mtx_lock(&pr->pr_mtx);
drflags |= PD_LOCKED;
} else {
/* Note a dying jail to handle later. */
deadpr = inspr;
}
inspr = NULL;
break;
}
if (cuflags == JAIL_CREATE && pr != NULL) {
/*
* Even creators that cannot see the jail will
* get EEXIST.
*/
error = EEXIST;
vfs_opterror(opts, "jail %d already exists", jid);
goto done_deref;
}
if ((pr == NULL)
? cuflags == JAIL_UPDATE
: !prison_ischild(mypr, pr)) {
/*
* Updaters get ENOENT for nonexistent jails,
* or for jails they cannot see. The latter
* case is true even for CREATE | UPDATE,
* which normally cannot give this error.
*/
error = ENOENT;
vfs_opterror(opts, "jail %d not found", jid);
goto done_deref;
}
}
/*
* If the caller provided a name, look for a jail by that name.
* This has different semantics for creates and updates keyed by jid
* (where the name must not already exist in a different jail),
* and updates keyed by the name itself (where the name must exist
* because that is the jail being updated).
*/
namelc = NULL;
if (name != NULL) {
namelc = strrchr(name, '.');
if (namelc == NULL)
namelc = name;
else {
/*
* This is a hierarchical name. Split it into the
* parent and child names, and make sure the parent
* exists or matches an already found jail.
*/
if (pr != NULL) {
if (strncmp(name, ppr->pr_name, namelc - name)
|| ppr->pr_name[namelc - name] != '\0') {
error = EINVAL;
vfs_opterror(opts,
"cannot change jail's parent");
goto done_deref;
}
} else {
*namelc = '\0';
ppr = prison_find_name(mypr, name);
if (ppr == NULL) {
error = ENOENT;
vfs_opterror(opts,
"jail \"%s\" not found", name);
goto done_deref;
}
mtx_unlock(&ppr->pr_mtx);
if (!prison_isalive(ppr)) {
error = ENOENT;
vfs_opterror(opts,
"jail \"%s\" is dying", name);
goto done_deref;
}
*namelc = '.';
}
namelc++;
}
if (namelc[0] != '\0') {
pnamelen =
(ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
FOREACH_PRISON_CHILD(ppr, tpr) {
if (tpr == pr || !prison_isalive(tpr) ||
strcmp(tpr->pr_name + pnamelen, namelc))
continue;
if (cuflags == JAIL_CREATE || pr != NULL) {
/*
* Create, or update(jid): name must
* not exist in an active sibling jail.
*/
error = EEXIST;
vfs_opterror(opts,
"jail \"%s\" already exists", name);
goto done_deref;
}
/* Use this jail for updates. */
pr = tpr;
mtx_lock(&pr->pr_mtx);
drflags |= PD_LOCKED;
break;
}
/*
* Update: name must exist if no jid is specified.
* As with the jid case, the jail must be currently
* visible, or else even CREATE | UPDATE will get
* an error.
*/
if ((pr == NULL)
? cuflags == JAIL_UPDATE
: !prison_isalive(pr)) {
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" not found",
name);
goto done_deref;
}
}
}
/* Update: must provide a jid or name. */
else if (cuflags == JAIL_UPDATE && pr == NULL) {
error = ENOENT;
vfs_opterror(opts, "update specified no jail");
goto done_deref;
}
/* If there's no prison to update, create a new one and link it in. */
created = pr == NULL;
if (created) {
for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
if (tpr->pr_childcount >= tpr->pr_childmax) {
error = EPERM;
vfs_opterror(opts, "prison limit exceeded");
goto done_deref;
}
if (deadpr != NULL) {
/*
* The prison being created has the same ID as a dying
* one. Handle this by giving the dying jail a new ID.
* This may cause some confusion to user space, but
* only to those listing dying jails.
*/
deadid = get_next_deadid(&dinspr);
if (deadid == 0) {
error = EAGAIN;
vfs_opterror(opts, "no available jail IDs");
goto done_deref;
}
mtx_lock(&deadpr->pr_mtx);
deadpr->pr_id = deadid;
mtx_unlock(&deadpr->pr_mtx);
if (dinspr == deadpr)
inspr = deadpr;
else {
inspr = TAILQ_NEXT(deadpr, pr_list);
TAILQ_REMOVE(&allprison, deadpr, pr_list);
if (dinspr != NULL)
TAILQ_INSERT_AFTER(&allprison, dinspr,
deadpr, pr_list);
else
TAILQ_INSERT_HEAD(&allprison, deadpr,
pr_list);
}
}
if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
error = EAGAIN;
vfs_opterror(opts, "no available jail IDs");
goto done_deref;
}
pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
pr->pr_state = PRISON_STATE_INVALID;
refcount_init(&pr->pr_ref, 1);
refcount_init(&pr->pr_uref, 0);
drflags |= PD_DEREF;
LIST_INIT(&pr->pr_children);
mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
pr->pr_id = jid;
if (inspr != NULL)
TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
else
TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
pr->pr_parent = ppr;
prison_hold(ppr);
prison_proc_hold(ppr);
LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
tpr->pr_childcount++;
/* Set some default values, and inherit some from the parent. */
if (namelc == NULL)
namelc = "";
if (path == NULL) {
path = "/";
root = mypr->pr_root;
vref(root);
}
strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
pr->pr_flags |= PR_HOST;
#if defined(INET) || defined(INET6)
#ifdef VIMAGE
if (!(pr_flags & PR_VNET))
#endif
{
#ifdef INET
if (!(ch_flags & PR_IP4_USER))
pr->pr_flags |= PR_IP4 | PR_IP4_USER;
else if (!(pr_flags & PR_IP4_USER)) {
pr->pr_flags |= ppr->pr_flags & PR_IP4;
prison_ip_dup(ppr, pr, PR_INET);
}
#endif
#ifdef INET6
if (!(ch_flags & PR_IP6_USER))
pr->pr_flags |= PR_IP6 | PR_IP6_USER;
else if (!(pr_flags & PR_IP6_USER)) {
pr->pr_flags |= ppr->pr_flags & PR_IP6;
prison_ip_dup(ppr, pr, PR_INET6);
}
#endif
}
#endif
/* Source address selection is always on by default. */
pr->pr_flags |= _PR_IP_SADDRSEL;
pr->pr_securelevel = ppr->pr_securelevel;
pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
pr->pr_enforce_statfs = jail_default_enforce_statfs;
pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
if (osrelstr == NULL)
strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
sizeof(pr->pr_osrelease));
else
strlcpy(pr->pr_osrelease, osrelstr,
sizeof(pr->pr_osrelease));
#ifdef VIMAGE
/* Allocate a new vnet if specified. */
pr->pr_vnet = (pr_flags & PR_VNET)
? vnet_alloc() : ppr->pr_vnet;
#endif
/*
* Allocate a dedicated cpuset for each jail.
* Unlike other initial settings, this may return an error.
*/
error = cpuset_create_root(ppr, &pr->pr_cpuset);
if (error)
goto done_deref;
mtx_lock(&pr->pr_mtx);
drflags |= PD_LOCKED;
} else {
/*
* Grab a reference for existing prisons, to ensure they
* continue to exist for the duration of the call.
*/
prison_hold(pr);
drflags |= PD_DEREF;
#if defined(VIMAGE) && (defined(INET) || defined(INET6))
if ((pr->pr_flags & PR_VNET) &&
(ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
error = EINVAL;
vfs_opterror(opts,
"vnet jails cannot have IP address restrictions");
goto done_deref;
}
#endif
#ifdef INET
if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
error = EINVAL;
vfs_opterror(opts,
"ip4 cannot be changed after creation");
goto done_deref;
}
#endif
#ifdef INET6
if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
error = EINVAL;
vfs_opterror(opts,
"ip6 cannot be changed after creation");
goto done_deref;
}
#endif
}
/* Do final error checking before setting anything. */
if (gotslevel) {
if (slevel < ppr->pr_securelevel) {
error = EPERM;
goto done_deref;
}
}
if (gotchildmax) {
if (childmax >= ppr->pr_childmax) {
error = EPERM;
goto done_deref;
}
}
if (gotenforce) {
if (enforce < ppr->pr_enforce_statfs) {
error = EPERM;
goto done_deref;
}
}
if (gotrsnum) {
/*
* devfs_rsnum is a uint16_t
*/
if (rsnum < 0 || rsnum > 65535) {
error = EINVAL;
goto done_deref;
}
/*
* Nested jails always inherit parent's devfs ruleset
*/
if (jailed(td->td_ucred)) {
if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
error = EPERM;
goto done_deref;
} else
rsnum = ppr->pr_devfs_rsnum;
}
}
#ifdef INET
if (ip4s > 0) {
if ((ppr->pr_flags & PR_IP4) &&
!prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
PR_INET)) {
error = EPERM;
goto done_deref;
}
if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
error = EADDRINUSE;
vfs_opterror(opts, "IPv4 addresses clash");
goto done_deref;
}
}
#endif
#ifdef INET6
if (ip6s > 0) {
if ((ppr->pr_flags & PR_IP6) &&
!prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
PR_INET6)) {
error = EPERM;
goto done_deref;
}
if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
error = EADDRINUSE;
vfs_opterror(opts, "IPv6 addresses clash");
goto done_deref;
}
}
#endif
onamelen = namelen = 0;
if (namelc != NULL) {
/* Give a default name of the jid. Also allow the name to be
* explicitly the jid - but not any other number, and only in
* normal form (no leading zero/etc).
*/
if (namelc[0] == '\0')
snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
else if ((strtoul(namelc, &p, 10) != jid ||
namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
error = EINVAL;
vfs_opterror(opts,
"name cannot be numeric (unless it is the jid)");
goto done_deref;
}
/*
* Make sure the name isn't too long for the prison or its
* children.
*/
pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
onamelen = strlen(pr->pr_name + pnamelen);
namelen = strlen(namelc);
if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
error = ENAMETOOLONG;
goto done_deref;
}
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
if (strlen(tpr->pr_name) + (namelen - onamelen) >=
sizeof(pr->pr_name)) {
error = ENAMETOOLONG;
goto done_deref;
}
}
}
pr_allow_diff = pr_allow & ~ppr->pr_allow;
if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
error = EPERM;
goto done_deref;
}
/*
* Let modules check their parameters. This requires unlocking and
* then re-locking the prison, but this is still a valid state as long
* as allprison_lock remains xlocked.
*/
mtx_unlock(&pr->pr_mtx);
drflags &= ~PD_LOCKED;
error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
if (error != 0)
goto done_deref;
mtx_lock(&pr->pr_mtx);
drflags |= PD_LOCKED;
/* At this point, all valid parameters should have been noted. */
TAILQ_FOREACH(opt, opts, link) {
if (!opt->seen && strcmp(opt->name, "errmsg")) {
error = EINVAL;
vfs_opterror(opts, "unknown parameter: %s", opt->name);
goto done_deref;
}
}
/* Set the parameters of the prison. */
#ifdef INET
redo_ip4 = false;
if (pr_flags & PR_IP4_USER) {
pr->pr_flags |= PR_IP4;
prison_ip_set(pr, PR_INET, ip4);
ip4 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET, NULL)) {
redo_ip4 = true;
descend = 0;
}
}
}
#endif
#ifdef INET6
redo_ip6 = false;
if (pr_flags & PR_IP6_USER) {
pr->pr_flags |= PR_IP6;
prison_ip_set(pr, PR_INET6, ip6);
ip6 = NULL;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET6, NULL)) {
redo_ip6 = true;
descend = 0;
}
}
}
#endif
if (gotslevel) {
pr->pr_securelevel = slevel;
/* Set all child jails to be at least this level. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
if (tpr->pr_securelevel < slevel)
tpr->pr_securelevel = slevel;
}
if (gotchildmax) {
pr->pr_childmax = childmax;
/* Set all child jails to under this limit. */
FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
if (tpr->pr_childmax > childmax - level)
tpr->pr_childmax = childmax > level
? childmax - level : 0;
}
if (gotenforce) {
pr->pr_enforce_statfs = enforce;
/* Pass this restriction on to the children. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
if (tpr->pr_enforce_statfs < enforce)
tpr->pr_enforce_statfs = enforce;
}
if (gotrsnum) {
pr->pr_devfs_rsnum = rsnum;
/* Pass this restriction on to the children. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
tpr->pr_devfs_rsnum = rsnum;
}
if (namelc != NULL) {
if (ppr == &prison0)
strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
else
snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
ppr->pr_name, namelc);
/* Change this component of child names. */
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
strlen(tpr->pr_name + onamelen) + 1);
bcopy(pr->pr_name, tpr->pr_name, namelen);
}
}
if (path != NULL) {
/* Try to keep a real-rooted full pathname. */
strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
pr->pr_root = root;
root = NULL;
}
if (PR_HOST & ch_flags & ~pr_flags) {
if (pr->pr_flags & PR_HOST) {
/*
* Copy the parent's host info. As with pr_ip4 above,
* the lack of a lock on the parent is not a problem;
* it is always set with allprison_lock at least
* shared, and is held exclusively here.
*/
strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
sizeof(pr->pr_hostname));
strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
sizeof(pr->pr_domainname));
strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
sizeof(pr->pr_hostuuid));
pr->pr_hostid = pr->pr_parent->pr_hostid;
}
} else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
/* Set this prison, and any descendants without PR_HOST. */
if (host != NULL)
strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
if (domain != NULL)
strlcpy(pr->pr_domainname, domain,
sizeof(pr->pr_domainname));
if (uuid != NULL)
strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
if (gothid)
pr->pr_hostid = hid;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
if (tpr->pr_flags & PR_HOST)
descend = 0;
else {
if (host != NULL)
strlcpy(tpr->pr_hostname,
pr->pr_hostname,
sizeof(tpr->pr_hostname));
if (domain != NULL)
strlcpy(tpr->pr_domainname,
pr->pr_domainname,
sizeof(tpr->pr_domainname));
if (uuid != NULL)
strlcpy(tpr->pr_hostuuid,
pr->pr_hostuuid,
sizeof(tpr->pr_hostuuid));
if (gothid)
tpr->pr_hostid = hid;
}
}
}
pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
if ((tallow = ch_allow & ~pr_allow))
prison_set_allow_locked(pr, tallow, 0);
/*
* Persistent prisons get an extra reference, and prisons losing their
* persist flag lose that reference.
*/
if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
if (pr_flags & PR_PERSIST) {
prison_hold(pr);
/*
* This may be a new prison's first user reference,
* but wait to call it alive until after OSD calls
* have had a chance to run (and perhaps to fail).
*/
refcount_acquire(&pr->pr_uref);
} else {
drflags |= PD_DEUREF;
prison_free_not_last(pr);
}
}
pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
mtx_unlock(&pr->pr_mtx);
drflags &= ~PD_LOCKED;
/*
* Any errors past this point will need to de-persist newly created
* prisons, as well as call remove methods.
*/
if (created)
drflags |= PD_KILL;
#ifdef RACCT
if (racct_enable && created)
prison_racct_attach(pr);
#endif
/* Locks may have prevented a complete restriction of child IP
* addresses. If so, allocate some more memory and try again.
*/
#ifdef INET
while (redo_ip4) {
ip4s = pr->pr_addrs[PR_INET]->ips;
MPASS(ip4 == NULL);
ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip4 = false;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET, &ip4))
redo_ip4 = true;
}
mtx_unlock(&pr->pr_mtx);
}
#endif
#ifdef INET6
while (redo_ip6) {
ip6s = pr->pr_addrs[PR_INET6]->ips;
MPASS(ip6 == NULL);
ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
mtx_lock(&pr->pr_mtx);
redo_ip6 = false;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
#ifdef VIMAGE
if (tpr->pr_flags & PR_VNET) {
descend = 0;
continue;
}
#endif
if (!prison_ip_restrict(tpr, PR_INET6, &ip6))
redo_ip6 = true;
}
mtx_unlock(&pr->pr_mtx);
}
#endif
/* Let the modules do their work. */
if (created) {
error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
if (error)
goto done_deref;
}
error = osd_jail_call(pr, PR_METHOD_SET, opts);
if (error)
goto done_deref;
/*
* A new prison is now ready to be seen; either it has gained a user
* reference via persistence, or is about to gain one via attachment.
*/
if (created) {
drflags = prison_lock_xlock(pr, drflags);
pr->pr_state = PRISON_STATE_ALIVE;
}
/* Attach this process to the prison if requested. */
if (flags & JAIL_ATTACH) {
error = do_jail_attach(td, pr,
prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
if (error) {
vfs_opterror(opts, "attach failed");
goto done_deref;
}
}
#ifdef RACCT
if (racct_enable && !created) {
if (drflags & PD_LOCKED) {
mtx_unlock(&pr->pr_mtx);
drflags &= ~PD_LOCKED;
}
if (drflags & PD_LIST_XLOCKED) {
sx_xunlock(&allprison_lock);
drflags &= ~PD_LIST_XLOCKED;
}
prison_racct_modify(pr);
}
#endif
if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 &&
(pr->pr_root->v_vflag & VV_ROOT) == 0)
printf("Warning jail jid=%d: mountd/nfsd requires a separate"
" file system\n", pr->pr_id);
drflags &= ~PD_KILL;
td->td_retval[0] = pr->pr_id;
done_deref:
/* Release any temporary prison holds and/or locks. */
if (pr != NULL)
prison_deref(pr, drflags);
else if (drflags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
else if (drflags & PD_LIST_XLOCKED)
sx_xunlock(&allprison_lock);
if (root != NULL)
vrele(root);
done_errmsg:
if (error) {
/* Write the error message back to userspace. */
if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
&errmsg_len) == 0 && errmsg_len > 0) {
errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
if (optuio->uio_segflg == UIO_SYSSPACE)
bcopy(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
else
(void)copyout(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
}
}
done_free:
#ifdef INET
prison_ip_free(ip4);
#endif
#ifdef INET6
prison_ip_free(ip6);
#endif
if (g_path != NULL)
free(g_path, M_TEMP);
vfs_freeopts(opts);
return (error);
}
/*
* Find the next available prison ID. Return the ID on success, or zero
* on failure. Also set a pointer to the allprison list entry the prison
* should be inserted before.
*/
static int
get_next_prid(struct prison **insprp)
{
struct prison *inspr;
int jid, maxid;
jid = lastprid % JAIL_MAX + 1;
if (TAILQ_EMPTY(&allprison) ||
TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
/*
* A common case is for all jails to be implicitly numbered,
* which means they'll go on the end of the list, at least
* for the first JAIL_MAX times.
*/
inspr = NULL;
} else {
/*
* Take two passes through the allprison list: first starting
* with the proposed jid, then ending with it.
*/
for (maxid = JAIL_MAX; maxid != 0; ) {
TAILQ_FOREACH(inspr, &allprison, pr_list) {
if (inspr->pr_id < jid)
continue;
if (inspr->pr_id > jid) {
/* Found an opening. */
maxid = 0;
break;
}
if (++jid > maxid) {
if (lastprid == maxid || lastprid == 0)
{
/*
* The entire legal range
* has been traversed
*/
return 0;
}
/* Try again from the start. */
jid = 1;
maxid = lastprid;
break;
}
}
if (inspr == NULL) {
/* Found room at the end of the list. */
break;
}
}
}
*insprp = inspr;
lastprid = jid;
return (jid);
}
/*
* Find the next available ID for a renumbered dead prison. This is the same
* as get_next_prid, but counting backward from the end of the range.
*/
static int
get_next_deadid(struct prison **dinsprp)
{
struct prison *dinspr;
int deadid, minid;
deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX;
/*
* Take two reverse passes through the allprison list: first
* starting with the proposed deadid, then ending with it.
*/
for (minid = 1; minid != 0; ) {
TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) {
if (dinspr->pr_id > deadid)
continue;
if (dinspr->pr_id < deadid) {
/* Found an opening. */
minid = 0;
break;
}
if (--deadid < minid) {
if (lastdeadid == minid || lastdeadid == 0)
{
/*
* The entire legal range
* has been traversed
*/
return 0;
}
/* Try again from the end. */
deadid = JAIL_MAX;
minid = lastdeadid;
break;
}
}
if (dinspr == NULL) {
/* Found room at the beginning of the list. */
break;
}
}
*dinsprp = dinspr;
lastdeadid = deadid;
return (deadid);
}
/*
* struct jail_get_args {
* struct iovec *iovp;
* unsigned int iovcnt;
* int flags;
* };
*/
int
sys_jail_get(struct thread *td, struct jail_get_args *uap)
{
struct uio *auio;
int error;
/* Check that we have an even number of iovecs. */
if (uap->iovcnt & 1)
return (EINVAL);
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
if (error)
return (error);
error = kern_jail_get(td, auio, uap->flags);
if (error == 0)
error = copyout(auio->uio_iov, uap->iovp,
uap->iovcnt * sizeof(struct iovec));
freeuio(auio);
return (error);
}
int
kern_jail_get(struct thread *td, struct uio *optuio, int flags)
{
struct bool_flags *bf;
struct jailsys_flags *jsf;
struct prison *pr, *mypr;
struct vfsopt *opt;
struct vfsoptlist *opts;
char *errmsg, *name;
int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
unsigned f;
if (flags & ~JAIL_GET_MASK)
return (EINVAL);
/* Get the parameter list. */
error = vfs_buildopts(optuio, &opts);
if (error)
return (error);
errmsg_pos = vfs_getopt_pos(opts, "errmsg");
mypr = td->td_ucred->cr_prison;
pr = NULL;
/*
* Find the prison specified by one of: lastjid, jid, name.
*/
sx_slock(&allprison_lock);
drflags = PD_LIST_SLOCKED;
error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
if (error == 0) {
TAILQ_FOREACH(pr, &allprison, pr_list) {
if (pr->pr_id > jid &&
((flags & JAIL_DYING) || prison_isalive(pr)) &&
prison_ischild(mypr, pr)) {
mtx_lock(&pr->pr_mtx);
drflags |= PD_LOCKED;
goto found_prison;
}
}
error = ENOENT;
vfs_opterror(opts, "no jail after %d", jid);
goto done;
} else if (error != ENOENT)
goto done;
error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
if (error == 0) {
if (jid != 0) {
pr = prison_find_child(mypr, jid);
if (pr != NULL) {
drflags |= PD_LOCKED;
if (!(prison_isalive(pr) ||
(flags & JAIL_DYING))) {
error = ENOENT;
vfs_opterror(opts, "jail %d is dying",
jid);
goto done;
}
goto found_prison;
}
error = ENOENT;
vfs_opterror(opts, "jail %d not found", jid);
goto done;
}
} else if (error != ENOENT)
goto done;
error = vfs_getopt(opts, "name", (void **)&name, &len);
if (error == 0) {
if (len == 0 || name[len - 1] != '\0') {
error = EINVAL;
goto done;
}
pr = prison_find_name(mypr, name);
if (pr != NULL) {
drflags |= PD_LOCKED;
if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" is dying",
name);
goto done;
}
goto found_prison;
}
error = ENOENT;
vfs_opterror(opts, "jail \"%s\" not found", name);
goto done;
} else if (error != ENOENT)
goto done;
vfs_opterror(opts, "no jail specified");
error = ENOENT;
goto done;
found_prison:
/* Get the parameters of the prison. */
prison_hold(pr);
drflags |= PD_DEREF;
td->td_retval[0] = pr->pr_id;
error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
if (error != 0 && error != ENOENT)
goto done;
i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
error = vfs_setopt(opts, "parent", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "name", prison_name(mypr, pr));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
sizeof(pr->pr_cpuset->cs_id));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "path", prison_path(mypr, pr));
if (error != 0 && error != ENOENT)
goto done;
#ifdef INET
error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip,
pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
pr_families[PR_INET].size : 0 );
if (error != 0 && error != ENOENT)
goto done;
#endif
#ifdef INET6
error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip,
pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
pr_families[PR_INET6].size : 0 );
if (error != 0 && error != ENOENT)
goto done;
#endif
error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
sizeof(pr->pr_securelevel));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
sizeof(pr->pr_childcount));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
sizeof(pr->pr_childmax));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
if (error != 0 && error != ENOENT)
goto done;
#ifdef COMPAT_FREEBSD32
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
uint32_t hid32 = pr->pr_hostid;
error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
} else
#endif
error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
sizeof(pr->pr_hostid));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
sizeof(pr->pr_enforce_statfs));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
sizeof(pr->pr_devfs_rsnum));
if (error != 0 && error != ENOENT)
goto done;
for (bf = pr_flag_bool;
bf < pr_flag_bool + nitems(pr_flag_bool);
bf++) {
i = (pr->pr_flags & bf->flag) ? 1 : 0;
error = vfs_setopt(opts, bf->name, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
i = !i;
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
}
for (jsf = pr_flag_jailsys;
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
jsf++) {
f = pr->pr_flags & (jsf->disable | jsf->new);
i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
: (f == jsf->new) ? JAIL_SYS_NEW
: JAIL_SYS_INHERIT;
error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
}
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++) {
i = (pr->pr_allow & bf->flag) ? 1 : 0;
error = vfs_setopt(opts, bf->name, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
i = !i;
error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
}
i = !prison_isalive(pr);
error = vfs_setopt(opts, "dying", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
i = !i;
error = vfs_setopt(opts, "nodying", &i, sizeof(i));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
sizeof(pr->pr_osreldate));
if (error != 0 && error != ENOENT)
goto done;
error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
if (error != 0 && error != ENOENT)
goto done;
/* Get the module parameters. */
mtx_unlock(&pr->pr_mtx);
drflags &= ~PD_LOCKED;
error = osd_jail_call(pr, PR_METHOD_GET, opts);
if (error)
goto done;
prison_deref(pr, drflags);
pr = NULL;
drflags = 0;
/* By now, all parameters should have been noted. */
TAILQ_FOREACH(opt, opts, link) {
if (!opt->seen && strcmp(opt->name, "errmsg")) {
error = EINVAL;
vfs_opterror(opts, "unknown parameter: %s", opt->name);
goto done;
}
}
/* Write the fetched parameters back to userspace. */
error = 0;
TAILQ_FOREACH(opt, opts, link) {
if (opt->pos >= 0 && opt->pos != errmsg_pos) {
pos = 2 * opt->pos + 1;
optuio->uio_iov[pos].iov_len = opt->len;
if (opt->value != NULL) {
if (optuio->uio_segflg == UIO_SYSSPACE) {
bcopy(opt->value,
optuio->uio_iov[pos].iov_base,
opt->len);
} else {
error = copyout(opt->value,
optuio->uio_iov[pos].iov_base,
opt->len);
if (error)
break;
}
}
}
}
done:
/* Release any temporary prison holds and/or locks. */
if (pr != NULL)
prison_deref(pr, drflags);
else if (drflags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
if (error && errmsg_pos >= 0) {
/* Write the error message back to userspace. */
vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
errmsg_pos = 2 * errmsg_pos + 1;
if (errmsg_len > 0) {
if (optuio->uio_segflg == UIO_SYSSPACE)
bcopy(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
else
(void)copyout(errmsg,
optuio->uio_iov[errmsg_pos].iov_base,
errmsg_len);
}
}
vfs_freeopts(opts);
return (error);
}
/*
* struct jail_remove_args {
* int jid;
* };
*/
int
sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
{
struct prison *pr;
int error;
error = priv_check(td, PRIV_JAIL_REMOVE);
if (error)
return (error);
sx_xlock(&allprison_lock);
pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
if (pr == NULL) {
sx_xunlock(&allprison_lock);
return (EINVAL);
}
if (!prison_isalive(pr)) {
/* Silently ignore already-dying prisons. */
mtx_unlock(&pr->pr_mtx);
sx_xunlock(&allprison_lock);
return (0);
}
prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
return (0);
}
/*
* struct jail_attach_args {
* int jid;
* };
*/
int
sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
{
struct prison *pr;
int error;
error = priv_check(td, PRIV_JAIL_ATTACH);
if (error)
return (error);
sx_slock(&allprison_lock);
pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
if (pr == NULL) {
sx_sunlock(&allprison_lock);
return (EINVAL);
}
/* Do not allow a process to attach to a prison that is not alive. */
if (!prison_isalive(pr)) {
mtx_unlock(&pr->pr_mtx);
sx_sunlock(&allprison_lock);
return (EINVAL);
}
return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
}
static int
do_jail_attach(struct thread *td, struct prison *pr, int drflags)
{
struct proc *p;
struct ucred *newcred, *oldcred;
int error;
mtx_assert(&pr->pr_mtx, MA_OWNED);
sx_assert(&allprison_lock, SX_LOCKED);
drflags &= PD_LOCK_FLAGS;
/*
* XXX: Note that there is a slight race here if two threads
* in the same privileged process attempt to attach to two
* different jails at the same time. It is important for
* user processes not to do this, or they might end up with
* a process root from one prison, but attached to the jail
* of another.
*/
prison_hold(pr);
refcount_acquire(&pr->pr_uref);
drflags |= PD_DEREF | PD_DEUREF;
mtx_unlock(&pr->pr_mtx);
drflags &= ~PD_LOCKED;
/* Let modules do whatever they need to prepare for attaching. */
error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
if (error) {
prison_deref(pr, drflags);
return (error);
}
sx_unlock(&allprison_lock);
drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
/*
* Reparent the newly attached process to this jail.
*/
p = td->td_proc;
error = cpuset_setproc_update_set(p, pr->pr_cpuset);
if (error)
goto e_revert_osd;
vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
if ((error = change_dir(pr->pr_root, td)) != 0)
goto e_unlock;
#ifdef MAC
if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
goto e_unlock;
#endif
VOP_UNLOCK(pr->pr_root);
if ((error = pwd_chroot_chdir(td, pr->pr_root)))
goto e_revert_osd;
newcred = crget();
PROC_LOCK(p);
oldcred = crcopysafe(p, newcred);
newcred->cr_prison = pr;
proc_set_cred(p, newcred);
setsugid(p);
#ifdef RACCT
racct_proc_ucred_changed(p, oldcred, newcred);
crhold(newcred);
#endif
PROC_UNLOCK(p);
#ifdef RCTL
rctl_proc_ucred_changed(p, newcred);
crfree(newcred);
#endif
prison_proc_relink(oldcred->cr_prison, pr, p);
prison_deref(oldcred->cr_prison, drflags);
crfree(oldcred);
/*
* If the prison was killed while changing credentials, die along
* with it.
*/
if (!prison_isalive(pr)) {
PROC_LOCK(p);
kern_psignal(p, SIGKILL);
PROC_UNLOCK(p);
}
return (0);
e_unlock:
VOP_UNLOCK(pr->pr_root);
e_revert_osd:
/* Tell modules this thread is still in its old jail after all. */
sx_slock(&allprison_lock);
drflags |= PD_LIST_SLOCKED;
(void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
prison_deref(pr, drflags);
return (error);
}
/*
* Returns a locked prison instance, or NULL on failure.
*/
struct prison *
prison_find(int prid)
{
struct prison *pr;
sx_assert(&allprison_lock, SX_LOCKED);
TAILQ_FOREACH(pr, &allprison, pr_list) {
if (pr->pr_id < prid)
continue;
if (pr->pr_id > prid)
break;
KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
mtx_lock(&pr->pr_mtx);
return (pr);
}
return (NULL);
}
/*
* Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
*/
struct prison *
prison_find_child(struct prison *mypr, int prid)
{
struct prison *pr;
int descend;
sx_assert(&allprison_lock, SX_LOCKED);
FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
if (pr->pr_id == prid) {
KASSERT(prison_isvalid(pr),
("Found invalid prison %p", pr));
mtx_lock(&pr->pr_mtx);
return (pr);
}
}
return (NULL);
}
/*
* Look for the name relative to mypr. Returns a locked prison or NULL.
*/
struct prison *
prison_find_name(struct prison *mypr, const char *name)
{
struct prison *pr, *deadpr;
size_t mylen;
int descend;
sx_assert(&allprison_lock, SX_LOCKED);
mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
deadpr = NULL;
FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
if (!strcmp(pr->pr_name + mylen, name)) {
KASSERT(prison_isvalid(pr),
("Found invalid prison %p", pr));
if (prison_isalive(pr)) {
mtx_lock(&pr->pr_mtx);
return (pr);
}
deadpr = pr;
}
}
/* There was no valid prison - perhaps there was a dying one. */
if (deadpr != NULL)
mtx_lock(&deadpr->pr_mtx);
return (deadpr);
}
/*
* See if a prison has the specific flag set. The prison should be locked,
* unless checking for flags that are only set at jail creation (such as
* PR_IP4 and PR_IP6), or only the single bit is examined, without regard
* to any other prison data.
*/
bool
prison_flag(struct ucred *cred, unsigned flag)
{
return ((cred->cr_prison->pr_flags & flag) != 0);
}
/*
* See if a prison has the specific allow flag set.
* The prison *should* be locked, or only a single bit is examined, without
* regard to any other prison data.
*/
bool
prison_allow(struct ucred *cred, unsigned flag)
{
return ((cred->cr_prison->pr_allow & flag) != 0);
}
/*
* Hold a prison reference, by incrementing pr_ref. It is generally
* an error to hold a prison that does not already have a reference.
* A prison record will remain valid as long as it has at least one
* reference, and will not be removed as long as either the prison
* mutex or the allprison lock is held (allprison_lock may be shared).
*/
void
prison_hold_locked(struct prison *pr)
{
/* Locking is no longer required. */
prison_hold(pr);
}
void
prison_hold(struct prison *pr)
{
#ifdef INVARIANTS
int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
KASSERT(was_valid,
("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
#else
refcount_acquire(&pr->pr_ref);
#endif
}
/*
* Remove a prison reference. If that was the last reference, the
* prison will be removed (at a later time).
*/
void
prison_free_locked(struct prison *pr)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
/*
* Locking is no longer required, but unlock because the caller
* expects it.
*/
mtx_unlock(&pr->pr_mtx);
prison_free(pr);
}
void
prison_free(struct prison *pr)
{
KASSERT(refcount_load(&pr->pr_ref) > 0,
("Trying to free dead prison %p (jid=%d).",
pr, pr->pr_id));
if (!refcount_release_if_not_last(&pr->pr_ref)) {
/*
* Don't remove the last reference in this context,
* in case there are locks held.
*/
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
}
}
static void
prison_free_not_last(struct prison *pr)
{
#ifdef INVARIANTS
int lastref;
KASSERT(refcount_load(&pr->pr_ref) > 0,
("Trying to free dead prison %p (jid=%d).",
pr, pr->pr_id));
lastref = refcount_release(&pr->pr_ref);
KASSERT(!lastref,
("prison_free_not_last freed last ref on prison %p (jid=%d).",
pr, pr->pr_id));
#else
refcount_release(&pr->pr_ref);
#endif
}
/*
* Hold a prison for user visibility, by incrementing pr_uref.
* It is generally an error to hold a prison that isn't already
* user-visible, except through the jail system calls. It is also
* an error to hold an invalid prison. A prison record will remain
* alive as long as it has at least one user reference, and will not
* be set to the dying state until the prison mutex and allprison_lock
* are both freed.
*/
void
prison_proc_hold(struct prison *pr)
{
#ifdef INVARIANTS
int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
KASSERT(was_alive,
("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
#else
refcount_acquire(&pr->pr_uref);
#endif
}
/*
* Remove a prison user reference. If it was the last reference, the
* prison will be considered "dying", and may be removed once all of
* its references are dropped.
*/
void
prison_proc_free(struct prison *pr)
{
/*
* Locking is only required when releasing the last reference.
* This allows assurance that a locked prison will remain alive
* until it is unlocked.
*/
KASSERT(refcount_load(&pr->pr_uref) > 0,
("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
if (!refcount_release_if_not_last(&pr->pr_uref)) {
/*
* Don't remove the last user reference in this context,
* which is expected to be a process that is not only locked,
* but also half dead. Add a reference so any calls to
* prison_free() won't re-submit the task.
*/
prison_hold(pr);
mtx_lock(&pr->pr_mtx);
KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
("Redundant last reference in prison_proc_free (jid=%d)",
pr->pr_id));
pr->pr_flags |= PR_COMPLETE_PROC;
mtx_unlock(&pr->pr_mtx);
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
}
}
static void
prison_proc_free_not_last(struct prison *pr)
{
#ifdef INVARIANTS
int lastref;
KASSERT(refcount_load(&pr->pr_uref) > 0,
("Trying to free dead prison %p (jid=%d).",
pr, pr->pr_id));
lastref = refcount_release(&pr->pr_uref);
KASSERT(!lastref,
("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
pr, pr->pr_id));
#else
refcount_release(&pr->pr_uref);
#endif
}
void
prison_proc_link(struct prison *pr, struct proc *p)
{
sx_assert(&allproc_lock, SA_XLOCKED);
LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
}
void
prison_proc_unlink(struct prison *pr, struct proc *p)
{
sx_assert(&allproc_lock, SA_XLOCKED);
LIST_REMOVE(p, p_jaillist);
}
static void
prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
{
sx_xlock(&allproc_lock);
prison_proc_unlink(opr, p);
prison_proc_link(npr, p);
sx_xunlock(&allproc_lock);
}
/*
* Complete a call to either prison_free or prison_proc_free.
*/
static void
prison_complete(void *context, int pending)
{
struct prison *pr = context;
int drflags;
/*
* This could be called to release the last reference, or the last
* user reference (plus the reference held in prison_proc_free).
*/
drflags = prison_lock_xlock(pr, PD_DEREF);
if (pr->pr_flags & PR_COMPLETE_PROC) {
pr->pr_flags &= ~PR_COMPLETE_PROC;
drflags |= PD_DEUREF;
}
prison_deref(pr, drflags);
}
static void
prison_kill_processes_cb(struct proc *p, void *arg __unused)
{
kern_psignal(p, SIGKILL);
}
/*
* Note the iteration does not guarantee acting on all processes.
* Most notably there may be fork or jail_attach in progress.
*/
void
prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
void *cbarg)
{
struct prison *ppr;
struct proc *p;
if (atomic_load_int(&pr->pr_childcount) == 0) {
sx_slock(&allproc_lock);
LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
if (p->p_state == PRS_NEW)
continue;
PROC_LOCK(p);
cb(p, cbarg);
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
if (atomic_load_int(&pr->pr_childcount) == 0)
return;
/*
* Some jails popped up during the iteration, fall through to a
* system-wide search.
*/
}
sx_slock(&allproc_lock);
FOREACH_PROC_IN_SYSTEM(p) {
PROC_LOCK(p);
if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
for (ppr = p->p_ucred->cr_prison;
ppr != &prison0;
ppr = ppr->pr_parent) {
if (ppr == pr) {
cb(p, cbarg);
break;
}
}
}
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
}
/*
* Remove a prison reference and/or user reference (usually).
* This assumes context that allows sleeping (for allprison_lock),
* with no non-sleeping locks held, except perhaps the prison itself.
* If there are no more references, release and delist the prison.
* On completion, the prison lock and the allprison lock are both
* unlocked.
*/
static void
prison_deref(struct prison *pr, int flags)
{
struct prisonlist freeprison;
struct prison *killpr, *rpr, *ppr, *tpr;
killpr = NULL;
TAILQ_INIT(&freeprison);
/*
* Release this prison as requested, which may cause its parent
* to be released, and then maybe its grandparent, etc.
*/
for (;;) {
if (flags & PD_KILL) {
/* Kill the prison and its descendents. */
KASSERT(pr != &prison0,
("prison_deref trying to kill prison0"));
if (!(flags & PD_DEREF)) {
prison_hold(pr);
flags |= PD_DEREF;
}
flags = prison_lock_xlock(pr, flags);
prison_deref_kill(pr, &freeprison);
}
if (flags & PD_DEUREF) {
/* Drop a user reference. */
KASSERT(refcount_load(&pr->pr_uref) > 0,
("prison_deref PD_DEUREF on a dead prison (jid=%d)",
pr->pr_id));
if (!refcount_release_if_not_last(&pr->pr_uref)) {
if (!(flags & PD_DEREF)) {
prison_hold(pr);
flags |= PD_DEREF;
}
flags = prison_lock_xlock(pr, flags);
if (refcount_release(&pr->pr_uref) &&
pr->pr_state == PRISON_STATE_ALIVE) {
/*
* When the last user references goes,
* this becomes a dying prison.
*/
KASSERT(
refcount_load(&prison0.pr_uref) > 0,
("prison0 pr_uref=0"));
pr->pr_state = PRISON_STATE_DYING;
mtx_unlock(&pr->pr_mtx);
flags &= ~PD_LOCKED;
prison_cleanup(pr);
}
}
}
if (flags & PD_KILL) {
/*
* Any remaining user references are probably processes
* that need to be killed, either in this prison or its
* descendants.
*/
if (refcount_load(&pr->pr_uref) > 0)
killpr = pr;
/* Make sure the parent prison doesn't get killed. */
flags &= ~PD_KILL;
}
if (flags & PD_DEREF) {
/* Drop a reference. */
KASSERT(refcount_load(&pr->pr_ref) > 0,
("prison_deref PD_DEREF on a dead prison (jid=%d)",
pr->pr_id));
if (!refcount_release_if_not_last(&pr->pr_ref)) {
flags = prison_lock_xlock(pr, flags);
if (refcount_release(&pr->pr_ref)) {
/*
* When the last reference goes,
* unlink the prison and set it aside.
*/
KASSERT(
refcount_load(&pr->pr_uref) == 0,
("prison_deref: last ref, "
"but still has %d urefs (jid=%d)",
pr->pr_uref, pr->pr_id));
KASSERT(
refcount_load(&prison0.pr_ref) != 0,
("prison0 pr_ref=0"));
pr->pr_state = PRISON_STATE_INVALID;
TAILQ_REMOVE(&allprison, pr, pr_list);
LIST_REMOVE(pr, pr_sibling);
TAILQ_INSERT_TAIL(&freeprison, pr,
pr_list);
for (ppr = pr->pr_parent;
ppr != NULL;
ppr = ppr->pr_parent)
ppr->pr_childcount--;
/*
* Removing a prison frees references
* from its parent.
*/
mtx_unlock(&pr->pr_mtx);
flags &= ~PD_LOCKED;
pr = pr->pr_parent;
flags |= PD_DEREF | PD_DEUREF;
continue;
}
}
}
break;
}
/* Release all the prison locks. */
if (flags & PD_LOCKED)
mtx_unlock(&pr->pr_mtx);
if (flags & PD_LIST_SLOCKED)
sx_sunlock(&allprison_lock);
else if (flags & PD_LIST_XLOCKED)
sx_xunlock(&allprison_lock);
/* Kill any processes attached to a killed prison. */
if (killpr != NULL)
prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
/*
* Finish removing any unreferenced prisons, which couldn't happen
* while allprison_lock was held (to avoid a LOR on vrele).
*/
TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
#ifdef VIMAGE
if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
vnet_destroy(rpr->pr_vnet);
#endif
if (rpr->pr_root != NULL)
vrele(rpr->pr_root);
mtx_destroy(&rpr->pr_mtx);
#ifdef INET
prison_ip_free(rpr->pr_addrs[PR_INET]);
#endif
#ifdef INET6
prison_ip_free(rpr->pr_addrs[PR_INET6]);
#endif
if (rpr->pr_cpuset != NULL)
cpuset_rel(rpr->pr_cpuset);
osd_jail_exit(rpr);
#ifdef RACCT
if (racct_enable)
prison_racct_detach(rpr);
#endif
TAILQ_REMOVE(&freeprison, rpr, pr_list);
free(rpr, M_PRISON);
}
}
/*
* Kill the prison and its descendants. Mark them as dying, clear the
* persist flag, and call module remove methods.
*/
static void
prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
{
struct prison *cpr, *ppr, *rpr;
bool descend;
/*
* Unlike the descendants, the target prison can be killed
* even if it is currently dying. This is useful for failed
* creation in jail_set(2).
*/
KASSERT(refcount_load(&pr->pr_ref) > 0,
("Trying to kill dead prison %p (jid=%d).",
pr, pr->pr_id));
refcount_acquire(&pr->pr_uref);
pr->pr_state = PRISON_STATE_DYING;
mtx_unlock(&pr->pr_mtx);
rpr = NULL;
FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
if (descend) {
if (!prison_isalive(cpr)) {
descend = false;
continue;
}
prison_hold(cpr);
prison_proc_hold(cpr);
mtx_lock(&cpr->pr_mtx);
cpr->pr_state = PRISON_STATE_DYING;
cpr->pr_flags |= PR_REMOVE;
mtx_unlock(&cpr->pr_mtx);
continue;
}
if (!(cpr->pr_flags & PR_REMOVE))
continue;
prison_cleanup(cpr);
mtx_lock(&cpr->pr_mtx);
cpr->pr_flags &= ~PR_REMOVE;
if (cpr->pr_flags & PR_PERSIST) {
cpr->pr_flags &= ~PR_PERSIST;
prison_proc_free_not_last(cpr);
prison_free_not_last(cpr);
}
(void)refcount_release(&cpr->pr_uref);
if (refcount_release(&cpr->pr_ref)) {
/*
* When the last reference goes, unlink the prison
* and set it aside for prison_deref() to handle.
* Delay unlinking the sibling list to keep the loop
* safe.
*/
if (rpr != NULL)
LIST_REMOVE(rpr, pr_sibling);
rpr = cpr;
rpr->pr_state = PRISON_STATE_INVALID;
TAILQ_REMOVE(&allprison, rpr, pr_list);
TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
/*
* Removing a prison frees references from its parent.
*/
ppr = rpr->pr_parent;
prison_proc_free_not_last(ppr);
prison_free_not_last(ppr);
for (; ppr != NULL; ppr = ppr->pr_parent)
ppr->pr_childcount--;
}
mtx_unlock(&cpr->pr_mtx);
}
if (rpr != NULL)
LIST_REMOVE(rpr, pr_sibling);
prison_cleanup(pr);
mtx_lock(&pr->pr_mtx);
if (pr->pr_flags & PR_PERSIST) {
pr->pr_flags &= ~PR_PERSIST;
prison_proc_free_not_last(pr);
prison_free_not_last(pr);
}
(void)refcount_release(&pr->pr_uref);
}
/*
* Given the current locking state in the flags, make sure allprison_lock
* is held exclusive, and the prison is locked. Return flags indicating
* the new state.
*/
static int
prison_lock_xlock(struct prison *pr, int flags)
{
if (!(flags & PD_LIST_XLOCKED)) {
/*
* Get allprison_lock, which may be an upgrade,
* and may require unlocking the prison.
*/
if (flags & PD_LOCKED) {
mtx_unlock(&pr->pr_mtx);
flags &= ~PD_LOCKED;
}
if (flags & PD_LIST_SLOCKED) {
if (!sx_try_upgrade(&allprison_lock)) {
sx_sunlock(&allprison_lock);
sx_xlock(&allprison_lock);
}
flags &= ~PD_LIST_SLOCKED;
} else
sx_xlock(&allprison_lock);
flags |= PD_LIST_XLOCKED;
}
if (!(flags & PD_LOCKED)) {
/* Lock the prison mutex. */
mtx_lock(&pr->pr_mtx);
flags |= PD_LOCKED;
}
return flags;
}
/*
* Release a prison's resources when it starts dying (when the last user
* reference is dropped, or when it is killed).
*/
static void
prison_cleanup(struct prison *pr)
{
sx_assert(&allprison_lock, SA_XLOCKED);
mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
vfs_exjail_delete(pr);
shm_remove_prison(pr);
(void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
}
/*
* Set or clear a permission bit in the pr_allow field, passing restrictions
* (cleared permission) down to child jails.
*/
void
prison_set_allow(struct ucred *cred, unsigned flag, int enable)
{
struct prison *pr;
pr = cred->cr_prison;
sx_slock(&allprison_lock);
mtx_lock(&pr->pr_mtx);
prison_set_allow_locked(pr, flag, enable);
mtx_unlock(&pr->pr_mtx);
sx_sunlock(&allprison_lock);
}
static void
prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
{
struct prison *cpr;
int descend;
if (enable != 0)
pr->pr_allow |= flag;
else {
pr->pr_allow &= ~flag;
FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
cpr->pr_allow &= ~flag;
}
}
/*
* Check if a jail supports the given address family.
*
* Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
* if not.
*/
int
prison_check_af(struct ucred *cred, int af)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
pr = cred->cr_prison;
#ifdef VIMAGE
/* Prisons with their own network stack are not limited. */
if (prison_owns_vnet(cred))
return (0);
#endif
error = 0;
switch (af)
{
#ifdef INET
case AF_INET:
if (pr->pr_flags & PR_IP4)
{
mtx_lock(&pr->pr_mtx);
if ((pr->pr_flags & PR_IP4) &&
pr->pr_addrs[PR_INET] == NULL)
error = EAFNOSUPPORT;
mtx_unlock(&pr->pr_mtx);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (pr->pr_flags & PR_IP6)
{
mtx_lock(&pr->pr_mtx);
if ((pr->pr_flags & PR_IP6) &&
pr->pr_addrs[PR_INET6] == NULL)
error = EAFNOSUPPORT;
mtx_unlock(&pr->pr_mtx);
}
break;
#endif
case AF_LOCAL:
case AF_ROUTE:
case AF_NETLINK:
break;
default:
if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Check if given address belongs to the jail referenced by cred (wrapper to
* prison_check_ip[46]).
*
* Returns 0 if jail doesn't restrict the address family or if address belongs
* to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
* the jail doesn't allow the address family. IPv4 Address passed in in NBO.
*/
int
prison_if(struct ucred *cred, const struct sockaddr *sa)
{
#ifdef INET
const struct sockaddr_in *sai;
#endif
#ifdef INET6
const struct sockaddr_in6 *sai6;
#endif
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
#ifdef VIMAGE
if (prison_owns_vnet(cred))
return (0);
#endif
error = 0;
switch (sa->sa_family)
{
#ifdef INET
case AF_INET:
sai = (const struct sockaddr_in *)sa;
error = prison_check_ip4(cred, &sai->sin_addr);
break;
#endif
#ifdef INET6
case AF_INET6:
sai6 = (const struct sockaddr_in6 *)sa;
error = prison_check_ip6(cred, &sai6->sin6_addr);
break;
#endif
default:
if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
error = EAFNOSUPPORT;
}
return (error);
}
/*
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
*/
int
prison_check(struct ucred *cred1, struct ucred *cred2)
{
return ((cred1->cr_prison == cred2->cr_prison ||
prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
}
/*
* For mountd/nfsd to run within a prison, it must be:
* - A vnet prison.
* - PR_ALLOW_NFSD must be set on it.
* - The root directory (pr_root) of the prison must be
* a file system mount point, so the mountd can hang
* export information on it.
* - The prison's enforce_statfs cannot be 0, so that
* mountd(8) can do exports.
*/
bool
prison_check_nfsd(struct ucred *cred)
{
if (jailed_without_vnet(cred))
return (false);
if (!prison_allow(cred, PR_ALLOW_NFSD))
return (false);
if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0)
return (false);
if (cred->cr_prison->pr_enforce_statfs == 0)
return (false);
return (true);
}
/*
* Return true if p2 is a child of p1, otherwise false.
*/
bool
prison_ischild(struct prison *pr1, struct prison *pr2)
{
for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
if (pr1 == pr2)
return (true);
return (false);
}
/*
* Return true if the prison is currently alive. A prison is alive if it
* holds user references and it isn't being removed.
*/
bool
prison_isalive(const struct prison *pr)
{
if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
return (false);
return (true);
}
/*
* Return true if the prison is currently valid. A prison is valid if it has
* been fully created, and is not being destroyed. Note that dying prisons
* are still considered valid. Invalid prisons won't be found under normal
* circumstances, as they're only put in that state by functions that have
* an exclusive hold on allprison_lock.
*/
bool
prison_isvalid(struct prison *pr)
{
if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
return (false);
if (__predict_false(refcount_load(&pr->pr_ref) == 0))
return (false);
return (true);
}
/*
* Return true if the passed credential is in a jail and that jail does not
* have its own virtual network stack, otherwise false.
*/
bool
jailed_without_vnet(struct ucred *cred)
{
if (!jailed(cred))
return (false);
#ifdef VIMAGE
if (prison_owns_vnet(cred))
return (false);
#endif
return (true);
}
/*
* Return the correct hostname (domainname, et al) for the passed credential.
*/
void
getcredhostname(struct ucred *cred, char *buf, size_t size)
{
struct prison *pr;
/*
* A NULL credential can be used to shortcut to the physical
* system's hostname.
*/
pr = (cred != NULL) ? cred->cr_prison : &prison0;
mtx_lock(&pr->pr_mtx);
strlcpy(buf, pr->pr_hostname, size);
mtx_unlock(&pr->pr_mtx);
}
void
getcreddomainname(struct ucred *cred, char *buf, size_t size)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(buf, cred->cr_prison->pr_domainname, size);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getcredhostuuid(struct ucred *cred, char *buf, size_t size)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getcredhostid(struct ucred *cred, unsigned long *hostid)
{
mtx_lock(&cred->cr_prison->pr_mtx);
*hostid = cred->cr_prison->pr_hostid;
mtx_unlock(&cred->cr_prison->pr_mtx);
}
void
getjailname(struct ucred *cred, char *name, size_t len)
{
mtx_lock(&cred->cr_prison->pr_mtx);
strlcpy(name, cred->cr_prison->pr_name, len);
mtx_unlock(&cred->cr_prison->pr_mtx);
}
#ifdef VIMAGE
/*
* Determine whether the prison represented by cred owns
* its vnet rather than having it inherited.
*
* Returns true in case the prison owns the vnet, false otherwise.
*/
bool
prison_owns_vnet(struct ucred *cred)
{
/*
* vnets cannot be added/removed after jail creation,
* so no need to lock here.
*/
return ((cred->cr_prison->pr_flags & PR_VNET) != 0);
}
#endif
/*
* Determine whether the subject represented by cred can "see"
* status of a mount point.
* Returns: 0 for permitted, ENOENT otherwise.
* XXX: This function should be called cr_canseemount() and should be
* placed in kern_prot.c.
*/
int
prison_canseemount(struct ucred *cred, struct mount *mp)
{
struct prison *pr;
struct statfs *sp;
size_t len;
pr = cred->cr_prison;
if (pr->pr_enforce_statfs == 0)
return (0);
if (pr->pr_root->v_mount == mp)
return (0);
if (pr->pr_enforce_statfs == 2)
return (ENOENT);
/*
* If jail's chroot directory is set to "/" we should be able to see
* all mount-points from inside a jail.
* This is ugly check, but this is the only situation when jail's
* directory ends with '/'.
*/
if (strcmp(pr->pr_path, "/") == 0)
return (0);
len = strlen(pr->pr_path);
sp = &mp->mnt_stat;
if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
return (ENOENT);
/*
* Be sure that we don't have situation where jail's root directory
* is "/some/path" and mount point is "/some/pathpath".
*/
if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
return (ENOENT);
return (0);
}
void
prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
{
char jpath[MAXPATHLEN];
struct prison *pr;
size_t len;
pr = cred->cr_prison;
if (pr->pr_enforce_statfs == 0)
return;
if (prison_canseemount(cred, mp) != 0) {
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
strlcpy(sp->f_mntonname, "[restricted]",
sizeof(sp->f_mntonname));
return;
}
if (pr->pr_root->v_mount == mp) {
/*
* Clear current buffer data, so we are sure nothing from
* the valid path left there.
*/
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
*sp->f_mntonname = '/';
return;
}
/*
* If jail's chroot directory is set to "/" we should be able to see
* all mount-points from inside a jail.
*/
if (strcmp(pr->pr_path, "/") == 0)
return;
len = strlen(pr->pr_path);
strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
/*
* Clear current buffer data, so we are sure nothing from
* the valid path left there.
*/
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
if (*jpath == '\0') {
/* Should never happen. */
*sp->f_mntonname = '/';
} else {
strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
}
}
/*
* Check with permission for a specific privilege is granted within jail. We
* have a specific list of accepted privileges; the rest are denied.
*/
int
prison_priv_check(struct ucred *cred, int priv)
{
struct prison *pr;
int error;
/*
* Some policies have custom handlers. This routine should not be
* called for them. See priv_check_cred().
*/
switch (priv) {
case PRIV_VFS_LOOKUP:
case PRIV_VFS_GENERATION:
KASSERT(0, ("prison_priv_check instead of a custom handler "
"called for %d\n", priv));
}
if (!jailed(cred))
return (0);
#ifdef VIMAGE
/*
* Privileges specific to prisons with a virtual network stack.
* There might be a duplicate entry here in case the privilege
* is only granted conditionally in the legacy jail case.
*/
switch (priv) {
/*
* NFS-specific privileges.
*/
case PRIV_NFS_DAEMON:
case PRIV_VFS_GETFH:
case PRIV_VFS_MOUNT_EXPORTED:
if (!prison_check_nfsd(cred))
return (EPERM);
#ifdef notyet
case PRIV_NFS_LOCKD:
#endif
/*
* Network stack privileges.
*/
case PRIV_NET_BRIDGE:
case PRIV_NET_GRE:
case PRIV_NET_BPF:
case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
case PRIV_NET_ROUTE:
case PRIV_NET_TAP:
case PRIV_NET_SETIFMTU:
case PRIV_NET_SETIFFLAGS:
case PRIV_NET_SETIFCAP:
case PRIV_NET_SETIFDESCR:
case PRIV_NET_SETIFNAME :
case PRIV_NET_SETIFMETRIC:
case PRIV_NET_SETIFPHYS:
case PRIV_NET_SETIFMAC:
case PRIV_NET_SETLANPCP:
case PRIV_NET_ADDMULTI:
case PRIV_NET_DELMULTI:
case PRIV_NET_HWIOCTL:
case PRIV_NET_SETLLADDR:
case PRIV_NET_ADDIFGROUP:
case PRIV_NET_DELIFGROUP:
case PRIV_NET_IFCREATE:
case PRIV_NET_IFDESTROY:
case PRIV_NET_ADDIFADDR:
case PRIV_NET_DELIFADDR:
case PRIV_NET_LAGG:
case PRIV_NET_GIF:
case PRIV_NET_SETIFVNET:
case PRIV_NET_SETIFFIB:
case PRIV_NET_OVPN:
case PRIV_NET_ME:
case PRIV_NET_WG:
/*
* 802.11-related privileges.
*/
case PRIV_NET80211_VAP_GETKEY:
case PRIV_NET80211_VAP_MANAGE:
#ifdef notyet
/*
* ATM privileges.
*/
case PRIV_NETATM_CFG:
case PRIV_NETATM_ADD:
case PRIV_NETATM_DEL:
case PRIV_NETATM_SET:
/*
* Bluetooth privileges.
*/
case PRIV_NETBLUETOOTH_RAW:
#endif
/*
* Netgraph and netgraph module privileges.
*/
case PRIV_NETGRAPH_CONTROL:
#ifdef notyet
case PRIV_NETGRAPH_TTY:
#endif
/*
* IPv4 and IPv6 privileges.
*/
case PRIV_NETINET_IPFW:
case PRIV_NETINET_DIVERT:
case PRIV_NETINET_PF:
case PRIV_NETINET_DUMMYNET:
case PRIV_NETINET_CARP:
case PRIV_NETINET_MROUTE:
case PRIV_NETINET_RAW:
case PRIV_NETINET_ADDRCTRL6:
case PRIV_NETINET_ND6:
case PRIV_NETINET_SCOPE6:
case PRIV_NETINET_ALIFETIME6:
case PRIV_NETINET_IPSEC:
case PRIV_NETINET_BINDANY:
#ifdef notyet
/*
* NCP privileges.
*/
case PRIV_NETNCP:
/*
* SMB privileges.
*/
case PRIV_NETSMB:
#endif
/*
* No default: or deny here.
* In case of no permit fall through to next switch().
*/
if (cred->cr_prison->pr_flags & PR_VNET)
return (0);
}
#endif /* VIMAGE */
switch (priv) {
/*
* Allow ktrace privileges for root in jail.
*/
case PRIV_KTRACE:
#if 0
/*
* Allow jailed processes to configure audit identity and
* submit audit records (login, etc). In the future we may
* want to further refine the relationship between audit and
* jail.
*/
case PRIV_AUDIT_GETAUDIT:
case PRIV_AUDIT_SETAUDIT:
case PRIV_AUDIT_SUBMIT:
#endif
/*
* Allow jailed processes to manipulate process UNIX
* credentials in any way they see fit.
*/
case PRIV_CRED_SETUID:
case PRIV_CRED_SETEUID:
case PRIV_CRED_SETGID:
case PRIV_CRED_SETEGID:
case PRIV_CRED_SETGROUPS:
case PRIV_CRED_SETREUID:
case PRIV_CRED_SETREGID:
case PRIV_CRED_SETRESUID:
case PRIV_CRED_SETRESGID:
/*
* Jail implements visibility constraints already, so allow
* jailed root to override uid/gid-based constraints.
*/
case PRIV_SEEOTHERGIDS:
case PRIV_SEEOTHERUIDS:
case PRIV_SEEJAILPROC:
/*
* Jail implements inter-process debugging limits already, so
* allow jailed root various debugging privileges.
*/
case PRIV_DEBUG_DIFFCRED:
case PRIV_DEBUG_SUGID:
case PRIV_DEBUG_UNPRIV:
/*
* Allow jail to set various resource limits and login
* properties, and for now, exceed process resource limits.
*/
case PRIV_PROC_LIMIT:
case PRIV_PROC_SETLOGIN:
case PRIV_PROC_SETRLIMIT:
/*
* System V and POSIX IPC privileges are granted in jail.
*/
case PRIV_IPC_READ:
case PRIV_IPC_WRITE:
case PRIV_IPC_ADMIN:
case PRIV_IPC_MSGSIZE:
case PRIV_MQ_ADMIN:
/*
* Jail operations within a jail work on child jails.
*/
case PRIV_JAIL_ATTACH:
case PRIV_JAIL_SET:
case PRIV_JAIL_REMOVE:
/*
* Jail implements its own inter-process limits, so allow
* root processes in jail to change scheduling on other
* processes in the same jail. Likewise for signalling.
*/
case PRIV_SCHED_DIFFCRED:
case PRIV_SCHED_CPUSET:
case PRIV_SIGNAL_DIFFCRED:
case PRIV_SIGNAL_SUGID:
/*
* Allow jailed processes to write to sysctls marked as jail
* writable.
*/
case PRIV_SYSCTL_WRITEJAIL:
/*
* Allow root in jail to manage a variety of quota
* properties. These should likely be conditional on a
* configuration option.
*/
case PRIV_VFS_GETQUOTA:
case PRIV_VFS_SETQUOTA:
/*
* Since Jail relies on chroot() to implement file system
* protections, grant many VFS privileges to root in jail.
* Be careful to exclude mount-related and NFS-related
* privileges.
*/
case PRIV_VFS_READ:
case PRIV_VFS_WRITE:
case PRIV_VFS_ADMIN:
case PRIV_VFS_EXEC:
case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
case PRIV_VFS_CHFLAGS_DEV:
case PRIV_VFS_CHOWN:
case PRIV_VFS_CHROOT:
case PRIV_VFS_RETAINSUGID:
case PRIV_VFS_FCHROOT:
case PRIV_VFS_LINK:
case PRIV_VFS_SETGID:
case PRIV_VFS_STAT:
case PRIV_VFS_STICKYFILE:
/*
* As in the non-jail case, non-root users are expected to be
* able to read kernel/physical memory (provided /dev/[k]mem
* exists in the jail and they have permission to access it).
*/
case PRIV_KMEM_READ:
return (0);
/*
* Depending on the global setting, allow privilege of
* setting system flags.
*/
case PRIV_VFS_SYSFLAGS:
if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
return (0);
else
return (EPERM);
/*
* Depending on the global setting, allow privilege of
* mounting/unmounting file systems.
*/
case PRIV_VFS_MOUNT:
case PRIV_VFS_UNMOUNT:
case PRIV_VFS_MOUNT_NONUSER:
case PRIV_VFS_MOUNT_OWNER:
pr = cred->cr_prison;
prison_lock(pr);
if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
error = 0;
else
error = EPERM;
prison_unlock(pr);
return (error);
/*
* Jails should hold no disposition on the PRIV_VFS_READ_DIR
* policy. priv_check_cred will not specifically allow it, and
* we may want a MAC policy to allow it.
*/
case PRIV_VFS_READ_DIR:
return (0);
/*
* Conditionally allow privileged process in the jail to
* manipulate filesystem extended attributes in the system
* namespace.
*/
case PRIV_VFS_EXTATTR_SYSTEM:
if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0)
return (0);
else
return (EPERM);
/*
* Conditionnaly allow locking (unlocking) physical pages
* in memory.
*/
case PRIV_VM_MLOCK:
case PRIV_VM_MUNLOCK:
if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
return (0);
else
return (EPERM);
/*
* Conditionally allow jailed root to bind reserved ports.
*/
case PRIV_NETINET_RESERVEDPORT:
if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
return (0);
else
return (EPERM);
/*
* Allow jailed root to reuse in-use ports.
*/
case PRIV_NETINET_REUSEPORT:
return (0);
/*
* Allow jailed root to set certain IPv4/6 (option) headers.
*/
case PRIV_NETINET_SETHDROPTS:
return (0);
/*
* Conditionally allow creating raw sockets in jail.
*/
case PRIV_NETINET_RAW:
if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
return (0);
else
return (EPERM);
/*
* Since jail implements its own visibility limits on netstat
* sysctls, allow getcred. This allows identd to work in
* jail.
*/
case PRIV_NETINET_GETCRED:
return (0);
/*
* Allow jailed root to set loginclass.
*/
case PRIV_PROC_SETLOGINCLASS:
return (0);
/*
* Do not allow a process inside a jail to read the kernel
* message buffer unless explicitly permitted.
*/
case PRIV_MSGBUF:
if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
return (0);
return (EPERM);
default:
/*
* In all remaining cases, deny the privilege request. This
* includes almost all network privileges, many system
* configuration privileges.
*/
return (EPERM);
}
}
/*
* Return the part of pr2's name that is relative to pr1, or the whole name
* if it does not directly follow.
*/
char *
prison_name(struct prison *pr1, struct prison *pr2)
{
char *name;
/* Jails see themselves as "0" (if they see themselves at all). */
if (pr1 == pr2)
return "0";
name = pr2->pr_name;
if (prison_ischild(pr1, pr2)) {
/*
* pr1 isn't locked (and allprison_lock may not be either)
* so its length can't be counted on. But the number of dots
* can be counted on - and counted.
*/
for (; pr1 != &prison0; pr1 = pr1->pr_parent)
name = strchr(name, '.') + 1;
}
return (name);
}
/*
* Return the part of pr2's path that is relative to pr1, or the whole path
* if it does not directly follow.
*/
static char *
prison_path(struct prison *pr1, struct prison *pr2)
{
char *path1, *path2;
int len1;
path1 = pr1->pr_path;
path2 = pr2->pr_path;
if (!strcmp(path1, "/"))
return (path2);
len1 = strlen(path1);
if (strncmp(path1, path2, len1))
return (path2);
if (path2[len1] == '\0')
return "/";
if (path2[len1] == '/')
return (path2 + len1);
return (path2);
}
/*
* Jail-related sysctls.
*/
static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Jails");
#if defined(INET) || defined(INET6)
/*
* Copy address array to memory that would be then SYSCTL_OUT-ed.
* sysctl_jail_list() helper.
*/
static void
prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
{
const struct prison_ip *pip;
const size_t size = pr_families[af].size;
again:
mtx_assert(&pr->pr_mtx, MA_OWNED);
if ((pip = pr->pr_addrs[af]) != NULL) {
if (*len < pip->ips) {
*len = pip->ips;
mtx_unlock(&pr->pr_mtx);
*out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
mtx_lock(&pr->pr_mtx);
goto again;
}
bcopy(pip->pr_ip, *out, pip->ips * size);
}
}
#endif
static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)
{
struct xprison *xp;
struct prison *pr, *cpr;
#ifdef INET
struct in_addr *ip4 = NULL;
int ip4s = 0;
#endif
#ifdef INET6
struct in6_addr *ip6 = NULL;
int ip6s = 0;
#endif
int descend, error;
xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
pr = req->td->td_ucred->cr_prison;
error = 0;
sx_slock(&allprison_lock);
FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
mtx_lock(&cpr->pr_mtx);
#ifdef INET
prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
#endif
#ifdef INET6
prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
#endif
bzero(xp, sizeof(*xp));
xp->pr_version = XPRISON_VERSION;
xp->pr_id = cpr->pr_id;
xp->pr_state = cpr->pr_state;
strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
#ifdef INET
xp->pr_ip4s = ip4s;
#endif
#ifdef INET6
xp->pr_ip6s = ip6s;
#endif
mtx_unlock(&cpr->pr_mtx);
error = SYSCTL_OUT(req, xp, sizeof(*xp));
if (error)
break;
#ifdef INET
if (xp->pr_ip4s > 0) {
error = SYSCTL_OUT(req, ip4,
xp->pr_ip4s * sizeof(struct in_addr));
if (error)
break;
}
#endif
#ifdef INET6
if (xp->pr_ip6s > 0) {
error = SYSCTL_OUT(req, ip6,
xp->pr_ip6s * sizeof(struct in6_addr));
if (error)
break;
}
#endif
}
sx_sunlock(&allprison_lock);
free(xp, M_TEMP);
#ifdef INET
free(ip4, M_TEMP);
#endif
#ifdef INET6
free(ip6, M_TEMP);
#endif
return (error);
}
SYSCTL_OID(_security_jail, OID_AUTO, list,
CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_list, "S", "List of active jails");
static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
{
int error, injail;
injail = jailed(req->td->td_ucred);
error = SYSCTL_OUT(req, &injail, sizeof(injail));
return (error);
}
SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_jailed, "I", "Process in jail?");
static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
{
int error, havevnet;
#ifdef VIMAGE
struct ucred *cred = req->td->td_ucred;
havevnet = jailed(cred) && prison_owns_vnet(cred);
#else
havevnet = 0;
#endif
error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
return (error);
}
SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_jail_vnet, "I", "Jail owns vnet?");
#if defined(INET) || defined(INET6)
SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
&jail_max_af_ips, 0,
"Number of IP addresses a jail may have at most per address family (deprecated)");
#endif
/*
* Default parameters for jail(2) compatibility. For historical reasons,
* the sysctl names have varying similarity to the parameter names. Prisons
* just see their own parameters, and can't change them.
*/
static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
{
int error, i;
/* Get the current flag value, and convert it to a boolean. */
if (req->td->td_ucred->cr_prison == &prison0) {
mtx_lock(&prison0.pr_mtx);
i = (jail_default_allow & arg2) != 0;
mtx_unlock(&prison0.pr_mtx);
} else
i = prison_allow(req->td->td_ucred, arg2);
if (arg1 != NULL)
i = !i;
error = sysctl_handle_int(oidp, &i, 0, req);
if (error || !req->newptr)
return (error);
i = i ? arg2 : 0;
if (arg1 != NULL)
i ^= arg2;
/*
* The sysctls don't have CTLFLAGS_PRISON, so assume prison0
* for writing.
*/
mtx_lock(&prison0.pr_mtx);
jail_default_allow = (jail_default_allow & ~arg2) | i;
mtx_unlock(&prison0.pr_mtx);
return (0);
}
SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
"Processes in jail can set their hostnames (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
(void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
"Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
"Processes in jail can use System V IPC primitives (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
"Prison root can create raw sockets (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
"Processes in jail can alter system file flags (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
"Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I",
"Processes in jail can lock/unlock physical pages in memory");
static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
{
struct prison *pr;
int level, error;
pr = req->td->td_ucred->cr_prison;
level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
error = sysctl_handle_int(oidp, &level, 0, req);
if (error || !req->newptr)
return (error);
*(int *)arg1 = level;
return (0);
}
SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
sysctl_jail_default_level, "I",
"Processes in jail cannot see all mounted file systems (deprecated)");
SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
&jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
sysctl_jail_default_level, "I",
"Ruleset for the devfs filesystem in jail (deprecated)");
SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Limits and stats of child jails");
static int
sysctl_jail_children(SYSCTL_HANDLER_ARGS)
{
struct prison *pr;
int i;
pr = req->td->td_ucred->cr_prison;
switch (oidp->oid_kind & CTLTYPE) {
case CTLTYPE_INT:
i = *(int *)((char *)pr + arg2);
return (SYSCTL_OUT(req, &i, sizeof(i)));
}
return (0);
}
SYSCTL_PROC(_security_jail_children, OID_AUTO, max,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children,
"I", "Maximum number of child jails");
SYSCTL_PROC(_security_jail_children, OID_AUTO, cur,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children,
"I", "Current number of child jails");
/*
* Nodes to describe jail parameters. Maximum length of string parameters
* is returned in the string itself, and the other parameters exist merely
* to make themselves and their types known.
*/
SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Jail parameters");
int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)
{
int i;
long l;
size_t s;
char numbuf[12];
switch (oidp->oid_kind & CTLTYPE)
{
case CTLTYPE_LONG:
case CTLTYPE_ULONG:
l = 0;
#ifdef SCTL_MASK32
if (!(req->flags & SCTL_MASK32))
#endif
return (SYSCTL_OUT(req, &l, sizeof(l)));
case CTLTYPE_INT:
case CTLTYPE_UINT:
i = 0;
return (SYSCTL_OUT(req, &i, sizeof(i)));
case CTLTYPE_STRING:
snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
return
(sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
case CTLTYPE_STRUCT:
s = (size_t)arg2;
return (SYSCTL_OUT(req, &s, sizeof(s)));
}
return (0);
}
/*
* CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
* jail creation time but cannot be changed in an existing jail.
*/
SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
"I", "Jail secure level");
SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
"Jail value for kern.osreldate and uname -K");
SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
"Jail value for kern.osrelease and uname -r");
SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
"I", "Jail cannot see all mounted file systems");
SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
"I", "Ruleset for in-jail devfs mounts");
SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail persistence");
#ifdef VIMAGE
SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
"E,jailsys", "Virtual network stack");
#endif
SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
"B", "Jail is in the process of shutting down");
SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
"I", "Current number of child jails");
SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
"I", "Maximum number of child jails");
SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
"Jail hostname");
SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
"Jail NIS domainname");
SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
"Jail host UUID");
SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
"LU", "Jail host ID");
SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
#ifdef INET
SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
"Jail IPv4 address virtualization");
SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
"S,in_addr,a", "Jail IPv4 addresses");
SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
"B", "Do (not) use IPv4 source address selection rather than the "
"primary jail IPv4 address.");
#endif
#ifdef INET6
SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
"Jail IPv6 address virtualization");
SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
"S,in6_addr,a", "Jail IPv6 addresses");
SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
"B", "Do (not) use IPv6 source address selection rather than the "
"primary jail IPv6 address.");
#endif
SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may set hostname");
SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may use SYSV IPC");
SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may create raw sockets");
SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may alter system file flags");
SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may set file quotas");
SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may lock (unlock) physical pages in memory");
SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may bind sockets to reserved ports");
SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may read the kernel message buffer");
SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
"B", "Unprivileged processes may use process debugging facilities");
SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
"B", "Processes in jail with uid 0 have privilege");
#ifdef VIMAGE
SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW,
"B", "Mountd/nfsd may run in the jail");
#endif
SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may set system-level filesystem extended attributes");
SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may mount/unmount jail-friendly file systems in general");
/*
* Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
* its associated bit in the pr_allow bitmask, or zero if the parameter was
* not created.
*/
unsigned
prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
const char *descr)
{
struct bool_flags *bf;
struct sysctl_oid *parent;
char *allow_name, *allow_noname, *allowed;
#ifndef NO_SYSCTL_DESCR
char *descr_deprecated;
#endif
u_int allow_flag;
if (prefix
? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
< 0 ||
asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
< 0
: asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
free(allow_name, M_PRISON);
return 0;
}
/*
* See if this parameter has already beed added, i.e. a module was
* previously loaded/unloaded.
*/
mtx_lock(&prison0.pr_mtx);
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++) {
if (strcmp(bf->name, allow_name) == 0) {
allow_flag = bf->flag;
goto no_add;
}
}
/*
* Find a free bit in pr_allow_all, failing if there are none
* (which shouldn't happen as long as we keep track of how many
* potential dynamic flags exist).
*/
for (allow_flag = 1;; allow_flag <<= 1) {
if (allow_flag == 0)
goto no_add;
if ((pr_allow_all & allow_flag) == 0)
break;
}
/* Note the parameter in the next open slot in pr_flag_allow. */
for (bf = pr_flag_allow; ; bf++) {
if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
/* This should never happen, but is not fatal. */
allow_flag = 0;
goto no_add;
}
if (atomic_load_int(&bf->flag) == 0)
break;
}
bf->name = allow_name;
bf->noname = allow_noname;
pr_allow_all |= allow_flag;
/*
* prison0 always has permission for the new parameter.
* Other jails must have it granted to them.
*/
prison0.pr_allow |= allow_flag;
/* The flag indicates a valid entry, so make sure it is set last. */
atomic_store_rel_int(&bf->flag, allow_flag);
mtx_unlock(&prison0.pr_mtx);
/*
* Create sysctls for the parameter, and the back-compat global
* permission.
*/
parent = prefix
? SYSCTL_ADD_NODE(NULL,
SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
: &sysctl___security_jail_param_allow;
(void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, 0, sysctl_jail_param, "B", descr);
if ((prefix
? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
: asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
#ifndef NO_SYSCTL_DESCR
(void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
descr);
#endif
(void)SYSCTL_ADD_PROC(NULL,
SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
sysctl_jail_default_allow, "I", descr_deprecated);
#ifndef NO_SYSCTL_DESCR
free(descr_deprecated, M_TEMP);
#endif
free(allowed, M_TEMP);
}
return allow_flag;
no_add:
mtx_unlock(&prison0.pr_mtx);
free(allow_name, M_PRISON);
free(allow_noname, M_PRISON);
return allow_flag;
}
/*
* The VFS system will register jail-aware filesystems here. They each get
* a parameter allow.mount.xxxfs and a flag to check when a jailed user
* attempts to mount.
*/
void
prison_add_vfs(struct vfsconf *vfsp)
{
#ifdef NO_SYSCTL_DESCR
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
NULL, NULL);
#else
char *descr;
(void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
vfsp->vfc_name);
vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
NULL, descr);
free(descr, M_TEMP);
#endif
}
#ifdef RACCT
void
prison_racct_foreach(void (*callback)(struct racct *racct,
void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
void *arg2, void *arg3)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_slock(&allprison_lock);
if (pre != NULL)
(pre)();
LIST_FOREACH(prr, &allprison_racct, prr_next)
(callback)(prr->prr_racct, arg2, arg3);
if (post != NULL)
(post)();
sx_sunlock(&allprison_lock);
}
static struct prison_racct *
prison_racct_find_locked(const char *name)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
return (NULL);
LIST_FOREACH(prr, &allprison_racct, prr_next) {
if (strcmp(name, prr->prr_name) != 0)
continue;
/* Found prison_racct with a matching name? */
prison_racct_hold(prr);
return (prr);
}
/* Add new prison_racct. */
prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
racct_create(&prr->prr_racct);
strcpy(prr->prr_name, name);
refcount_init(&prr->prr_refcount, 1);
LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
return (prr);
}
struct prison_racct *
prison_racct_find(const char *name)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_xlock(&allprison_lock);
prr = prison_racct_find_locked(name);
sx_xunlock(&allprison_lock);
return (prr);
}
void
prison_racct_hold(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
refcount_acquire(&prr->prr_refcount);
}
static void
prison_racct_free_locked(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
if (refcount_release(&prr->prr_refcount)) {
racct_destroy(&prr->prr_racct);
LIST_REMOVE(prr, prr_next);
free(prr, M_PRISON_RACCT);
}
}
void
prison_racct_free(struct prison_racct *prr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_UNLOCKED);
if (refcount_release_if_not_last(&prr->prr_refcount))
return;
sx_xlock(&allprison_lock);
prison_racct_free_locked(prr);
sx_xunlock(&allprison_lock);
}
static void
prison_racct_attach(struct prison *pr)
{
struct prison_racct *prr;
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_XLOCKED);
prr = prison_racct_find_locked(pr->pr_name);
KASSERT(prr != NULL, ("cannot find prison_racct"));
pr->pr_prison_racct = prr;
}
/*
* Handle jail renaming. From the racct point of view, renaming means
* moving from one prison_racct to another.
*/
static void
prison_racct_modify(struct prison *pr)
{
#ifdef RCTL
struct proc *p;
struct ucred *cred;
#endif
struct prison_racct *oldprr;
ASSERT_RACCT_ENABLED();
sx_slock(&allproc_lock);
sx_xlock(&allprison_lock);
if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
sx_xunlock(&allprison_lock);
sx_sunlock(&allproc_lock);
return;
}
oldprr = pr->pr_prison_racct;
pr->pr_prison_racct = NULL;
prison_racct_attach(pr);
/*
* Move resource utilisation records.
*/
racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
#ifdef RCTL
/*
* Force rctl to reattach rules to processes.
*/
FOREACH_PROC_IN_SYSTEM(p) {
PROC_LOCK(p);
cred = crhold(p->p_ucred);
PROC_UNLOCK(p);
rctl_proc_ucred_changed(p, cred);
crfree(cred);
}
#endif
sx_sunlock(&allproc_lock);
prison_racct_free_locked(oldprr);
sx_xunlock(&allprison_lock);
}
static void
prison_racct_detach(struct prison *pr)
{
ASSERT_RACCT_ENABLED();
sx_assert(&allprison_lock, SA_UNLOCKED);
if (pr->pr_prison_racct == NULL)
return;
prison_racct_free(pr->pr_prison_racct);
pr->pr_prison_racct = NULL;
}
#endif /* RACCT */
#ifdef DDB
static void
db_show_prison(struct prison *pr)
{
struct bool_flags *bf;
struct jailsys_flags *jsf;
#if defined(INET) || defined(INET6)
int ii;
struct prison_ip *pip;
#endif
unsigned f;
#ifdef INET
char ip4buf[INET_ADDRSTRLEN];
#endif
#ifdef INET6
char ip6buf[INET6_ADDRSTRLEN];
#endif
db_printf("prison %p:\n", pr);
db_printf(" jid = %d\n", pr->pr_id);
db_printf(" name = %s\n", pr->pr_name);
db_printf(" parent = %p\n", pr->pr_parent);
db_printf(" ref = %d\n", pr->pr_ref);
db_printf(" uref = %d\n", pr->pr_uref);
db_printf(" state = %s\n",
pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
pr->pr_state == PRISON_STATE_DYING ? "dying" :
"invalid");
db_printf(" path = %s\n", pr->pr_path);
db_printf(" cpuset = %d\n", pr->pr_cpuset
? pr->pr_cpuset->cs_id : -1);
#ifdef VIMAGE
db_printf(" vnet = %p\n", pr->pr_vnet);
#endif
db_printf(" root = %p\n", pr->pr_root);
db_printf(" securelevel = %d\n", pr->pr_securelevel);
db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
db_printf(" children.max = %d\n", pr->pr_childmax);
db_printf(" children.cur = %d\n", pr->pr_childcount);
db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
db_printf(" flags = 0x%x", pr->pr_flags);
for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
if (pr->pr_flags & bf->flag)
db_printf(" %s", bf->name);
for (jsf = pr_flag_jailsys;
jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
jsf++) {
f = pr->pr_flags & (jsf->disable | jsf->new);
db_printf(" %-16s= %s\n", jsf->name,
(f != 0 && f == jsf->disable) ? "disable"
: (f == jsf->new) ? "new"
: "inherit");
}
db_printf(" allow = 0x%x", pr->pr_allow);
for (bf = pr_flag_allow;
bf < pr_flag_allow + nitems(pr_flag_allow) &&
atomic_load_int(&bf->flag) != 0;
bf++)
if (pr->pr_allow & bf->flag)
db_printf(" %s", bf->name);
db_printf("\n");
db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
db_printf(" host.hostname = %s\n", pr->pr_hostname);
db_printf(" host.domainname = %s\n", pr->pr_domainname);
db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
db_printf(" host.hostid = %lu\n", pr->pr_hostid);
#ifdef INET
if ((pip = pr->pr_addrs[PR_INET]) != NULL) {
db_printf(" ip4s = %d\n", pip->ips);
for (ii = 0; ii < pip->ips; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip4.addr =" : " ",
inet_ntoa_r(
*(const struct in_addr *)PR_IP(pip, PR_INET, ii),
ip4buf));
}
#endif
#ifdef INET6
if ((pip = pr->pr_addrs[PR_INET6]) != NULL) {
db_printf(" ip6s = %d\n", pip->ips);
for (ii = 0; ii < pip->ips; ii++)
db_printf(" %s %s\n",
ii == 0 ? "ip6.addr =" : " ",
ip6_sprintf(ip6buf,
(const struct in6_addr *)PR_IP(pip, PR_INET6, ii)));
}
#endif
}
DB_SHOW_COMMAND(prison, db_show_prison_command)
{
struct prison *pr;
if (!have_addr) {
/*
* Show all prisons in the list, and prison0 which is not
* listed.
*/
db_show_prison(&prison0);
if (!db_pager_quit) {
TAILQ_FOREACH(pr, &allprison, pr_list) {
db_show_prison(pr);
if (db_pager_quit)
break;
}
}
return;
}
if (addr == 0)
pr = &prison0;
else {
/* Look for a prison with the ID and with references. */
TAILQ_FOREACH(pr, &allprison, pr_list)
if (pr->pr_id == addr && pr->pr_ref > 0)
break;
if (pr == NULL)
/* Look again, without requiring a reference. */
TAILQ_FOREACH(pr, &allprison, pr_list)
if (pr->pr_id == addr)
break;
if (pr == NULL)
/* Assume address points to a valid prison. */
pr = (struct prison *)addr;
}
db_show_prison(pr);
}
#endif /* DDB */
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