2 * Copyright (c) 2011 James Gritton
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/errno.h>
32 #include <sys/socket.h>
33 #include <sys/sysctl.h>
35 #include <arpa/inet.h>
36 #include <netinet/in.h>
55 struct cfjails cfjails = TAILQ_HEAD_INITIALIZER(cfjails);
57 static void free_param(struct cfparams *pp, struct cfparam *p);
58 static void free_param_strings(struct cfparam *p);
60 static const struct ipspec intparams[] = {
61 [IP_ALLOW_DYING] = {"allow.dying", PF_INTERNAL | PF_BOOL},
62 [IP_COMMAND] = {"command", PF_INTERNAL},
63 [IP_DEPEND] = {"depend", PF_INTERNAL},
64 [IP_EXEC_CLEAN] = {"exec.clean", PF_INTERNAL | PF_BOOL},
65 [IP_EXEC_CONSOLELOG] = {"exec.consolelog", PF_INTERNAL},
66 [IP_EXEC_FIB] = {"exec.fib", PF_INTERNAL | PF_INT},
67 [IP_EXEC_JAIL_USER] = {"exec.jail_user", PF_INTERNAL},
68 [IP_EXEC_POSTSTART] = {"exec.poststart", PF_INTERNAL},
69 [IP_EXEC_POSTSTOP] = {"exec.poststop", PF_INTERNAL},
70 [IP_EXEC_PRESTART] = {"exec.prestart", PF_INTERNAL},
71 [IP_EXEC_PRESTOP] = {"exec.prestop", PF_INTERNAL},
72 [IP_EXEC_START] = {"exec.start", PF_INTERNAL},
73 [IP_EXEC_STOP] = {"exec.stop", PF_INTERNAL},
74 [IP_EXEC_SYSTEM_JAIL_USER]= {"exec.system_jail_user",
75 PF_INTERNAL | PF_BOOL},
76 [IP_EXEC_SYSTEM_USER] = {"exec.system_user", PF_INTERNAL},
77 [IP_EXEC_TIMEOUT] = {"exec.timeout", PF_INTERNAL | PF_INT},
78 #if defined(INET) || defined(INET6)
79 [IP_INTERFACE] = {"interface", PF_INTERNAL},
80 [IP_IP_HOSTNAME] = {"ip_hostname", PF_INTERNAL | PF_BOOL},
82 [IP_MOUNT] = {"mount", PF_INTERNAL | PF_REV},
83 [IP_MOUNT_DEVFS] = {"mount.devfs", PF_INTERNAL | PF_BOOL},
84 [IP_MOUNT_FSTAB] = {"mount.fstab", PF_INTERNAL},
85 [IP_STOP_TIMEOUT] = {"stop.timeout", PF_INTERNAL | PF_INT},
86 [IP_VNET_INTERFACE] = {"vnet.interface", PF_INTERNAL},
88 [IP__IP4_IFADDR] = {"ip4.addr", PF_INTERNAL | PF_CONV | PF_REV},
91 [IP__IP6_IFADDR] = {"ip6.addr", PF_INTERNAL | PF_CONV | PF_REV},
93 [IP__MOUNT_FROM_FSTAB] = {"mount.fstab", PF_INTERNAL | PF_CONV | PF_REV},
94 [IP__OP] = {NULL, PF_CONV},
95 [KP_ALLOW_CHFLAGS] = {"allow.chflags", 0},
96 [KP_ALLOW_MOUNT] = {"allow.mount", 0},
97 [KP_ALLOW_RAW_SOCKETS] = {"allow.raw_sockets", 0},
98 [KP_ALLOW_SET_HOSTNAME]= {"allow.set_hostname", 0},
99 [KP_ALLOW_SOCKET_AF] = {"allow.socket_af", 0},
100 [KP_ALLOW_SYSVIPC] = {"allow.sysvipc", 0},
101 [KP_DEVFS_RULESET] = {"devfs_ruleset", 0},
102 [KP_ENFORCE_STATFS] = {"enforce_statfs", 0},
103 [KP_HOST_HOSTNAME] = {"host.hostname", 0},
105 [KP_IP4_ADDR] = {"ip4.addr", 0},
108 [KP_IP6_ADDR] = {"ip6.addr", 0},
110 [KP_JID] = {"jid", 0},
111 [KP_NAME] = {"name", 0},
112 [KP_PATH] = {"path", 0},
113 [KP_PERSIST] = {"persist", 0},
114 [KP_SECURELEVEL] = {"securelevel", 0},
115 [KP_VNET] = {"vnet", 0},
119 * Parse the jail configuration file.
126 struct cfjail *j, *tj, *wj;
127 struct cfparam *p, *vp, *tp;
128 struct cfstring *s, *vs, *ns;
132 int did_self, jseq, pgen;
134 if (!strcmp(cfname, "-")) {
138 yyin = fopen(cfname, "r");
140 err(1, "%s", cfname);
142 if (yyparse() || yynerrs)
145 /* Separate the wildcard jails out from the actual jails. */
148 TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
150 if (wild_jail_name(j->name))
154 TAILQ_FOREACH(j, &cfjails, tq) {
155 /* Set aside the jail's parameters. */
157 TAILQ_CONCAT(&opp, &j->params, tq);
159 * The jail name implies its "name" or "jid" parameter,
160 * though they may also be explicitly set later on.
163 strtol(j->name, &ep, 10) && !*ep ? KP_JID : KP_NAME,
166 * Collect parameters for the jail, global parameters/variables,
167 * and any matching wildcard jails.
170 TAILQ_FOREACH(wj, &wild, tq) {
171 if (j->seq < wj->seq && !did_self) {
172 TAILQ_FOREACH(p, &opp, tq)
173 add_param(j, p, 0, NULL);
176 if (wild_jail_match(j->name, wj->name))
177 TAILQ_FOREACH(p, &wj->params, tq)
178 add_param(j, p, 0, NULL);
181 TAILQ_FOREACH(p, &opp, tq)
182 add_param(j, p, 0, NULL);
184 /* Resolve any variable substitutions. */
186 TAILQ_FOREACH(p, &j->params, tq) {
189 TAILQ_FOREACH(s, &p->val, tq) {
191 while ((v = STAILQ_FIRST(&s->vars))) {
192 TAILQ_FOREACH(vp, &j->params, tq)
193 if (!strcmp(vp->name, v->name))
197 "%s: variable \"%s\" not found",
200 j->flags |= JF_FAILED;
201 TAILQ_FOREACH(vp, &j->params, tq)
206 if (vp->flags & PF_BAD)
208 if (vp->gen == pgen) {
209 jail_warnx(j, "%s: variable loop",
213 TAILQ_FOREACH(vs, &vp->val, tq)
214 if (!STAILQ_EMPTY(&vs->vars)) {
216 TAILQ_REMOVE(&j->params, vp,
218 TAILQ_INSERT_BEFORE(p, vp, tq);
222 vs = TAILQ_FIRST(&vp->val);
223 if (TAILQ_NEXT(vs, tq) != NULL &&
225 STAILQ_NEXT(v, tq))) {
226 jail_warnx(j, "%s: array cannot be "
227 "substituted inline",
231 s->s = erealloc(s->s, s->len + vs->len + 1);
232 memmove(s->s + v->pos + varoff + vs->len,
233 s->s + v->pos + varoff,
234 s->len - (v->pos + varoff) + 1);
235 memcpy(s->s + v->pos + varoff, vs->s, vs->len);
238 while ((vs = TAILQ_NEXT(vs, tq))) {
239 ns = emalloc(sizeof(struct cfstring));
240 ns->s = estrdup(vs->s);
242 STAILQ_INIT(&ns->vars);
243 TAILQ_INSERT_AFTER(&p->val, s, ns, tq);
248 STAILQ_REMOVE_HEAD(&s->vars, tq);
254 /* Free the jail's original parameter list and any variables. */
255 while ((p = TAILQ_FIRST(&opp)))
257 TAILQ_FOREACH_SAFE(p, &j->params, tq, tp)
258 if (p->flags & PF_VAR)
259 free_param(&j->params, p);
261 while ((wj = TAILQ_FIRST(&wild))) {
263 while ((p = TAILQ_FIRST(&wj->params)))
264 free_param(&wj->params, p);
265 TAILQ_REMOVE(&wild, wj, tq);
270 * Create a new jail record.
277 j = emalloc(sizeof(struct cfjail));
278 memset(j, 0, sizeof(struct cfjail));
279 TAILQ_INIT(&j->params);
280 STAILQ_INIT(&j->dep[DEP_FROM]);
281 STAILQ_INIT(&j->dep[DEP_TO]);
283 TAILQ_INSERT_TAIL(&cfjails, j, tq);
288 * Add a parameter to a jail.
291 add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
294 struct cfstrings nss;
295 struct cfparam *dp, *np;
296 struct cfstring *s, *ns;
297 struct cfvar *v, *nv;
303 /* Create a single anonymous jail if one doesn't yet exist. */
304 j = TAILQ_LAST(&cfjails, cfjails);
313 * Make a copy of the parameter's string list,
314 * which may be freed if it's overridden later.
316 TAILQ_FOREACH(s, &p->val, tq) {
317 ns = emalloc(sizeof(struct cfstring));
318 ns->s = estrdup(s->s);
320 STAILQ_INIT(&ns->vars);
321 STAILQ_FOREACH(v, &s->vars, tq) {
322 nv = emalloc(sizeof(struct cfvar));
323 nv->name = strdup(v->name);
325 STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
327 TAILQ_INSERT_TAIL(&nss, ns, tq);
331 if (ipnum != IP__NULL) {
332 name = intparams[ipnum].name;
333 flags |= intparams[ipnum].flags;
334 } else if ((cs = strchr(value, '='))) {
335 tname = alloca(cs - value + 1);
336 strlcpy(tname, value, cs - value + 1);
344 ns = emalloc(sizeof(struct cfstring));
345 ns->s = estrdup(value);
346 ns->len = strlen(value);
347 STAILQ_INIT(&ns->vars);
348 TAILQ_INSERT_TAIL(&nss, ns, tq);
352 /* See if this parameter has already been added. */
353 if (ipnum != IP__NULL)
354 dp = j->intparams[ipnum];
356 TAILQ_FOREACH(dp, &j->params, tq)
357 if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
360 /* Found it - append or replace. */
361 if (strcmp(dp->name, name)) {
363 dp->name = estrdup(name);
365 if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
366 free_param_strings(dp);
367 TAILQ_CONCAT(&dp->val, &nss, tq);
370 /* Not found - add it. */
371 np = emalloc(sizeof(struct cfparam));
372 np->name = estrdup(name);
373 TAILQ_INIT(&np->val);
374 TAILQ_CONCAT(&np->val, &nss, tq);
377 TAILQ_INSERT_TAIL(&j->params, np, tq);
378 if (ipnum != IP__NULL)
379 j->intparams[ipnum] = np;
381 for (ipnum = IP__NULL + 1; ipnum < IP_NPARAM; ipnum++)
382 if (!(intparams[ipnum].flags & PF_CONV) &&
383 equalopts(name, intparams[ipnum].name)) {
384 j->intparams[ipnum] = np;
385 np->flags |= intparams[ipnum].flags;
392 * Return if a boolean parameter exists and is true.
395 bool_param(const struct cfparam *p)
401 cs = strrchr(p->name, '.');
402 return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
403 (TAILQ_EMPTY(&p->val) ||
404 !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
405 (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
409 * Set an integer if a parameter if it exists.
412 int_param(const struct cfparam *p, int *ip)
414 if (p == NULL || TAILQ_EMPTY(&p->val))
416 *ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
421 * Return the string value of a scalar parameter if it exists.
424 string_param(const struct cfparam *p)
426 return (p && !TAILQ_EMPTY(&p->val)
427 ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
431 * Check syntax and values of internal parameters. Set some internal
432 * parameters based on the values of others.
435 check_intparams(struct cfjail *j)
444 #if defined(INET) || defined(INET6)
445 struct addrinfo hints;
446 struct addrinfo *ai0, *ai;
447 const char *hostname;
448 int gicode, defif, prefix;
451 struct in_addr addr4;
453 char avalue4[INET_ADDRSTRLEN];
456 struct in6_addr addr6;
458 char avalue6[INET6_ADDRSTRLEN];
462 /* Check format of boolan and integer values. */
463 TAILQ_FOREACH(p, &j->params, tq) {
464 if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
465 val = TAILQ_LAST(&p->val, cfstrings)->s;
466 if (p->flags & PF_BOOL) {
467 if (strcasecmp(val, "false") &&
468 strcasecmp(val, "true") &&
469 ((void)strtol(val, &ep, 10), *ep)) {
471 "%s: unknown boolean value \"%s\"",
476 (void)strtol(val, &ep, 10);
477 if (ep == val || *ep) {
479 "%s: non-integer value \"%s\"",
487 #if defined(INET) || defined(INET6)
489 * The ip_hostname parameter looks up the hostname, and adds parameters
490 * for any IP addresses it finds.
492 if (((j->flags & JF_OP_MASK) != JF_STOP ||
493 j->intparams[IP_INTERFACE] != NULL) &&
494 bool_param(j->intparams[IP_IP_HOSTNAME]) &&
495 (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
496 j->intparams[IP_IP_HOSTNAME] = NULL;
498 * Silently ignore unsupported address families from
502 ip4ok = feature_present("inet");
505 ip6ok = feature_present("inet6");
508 #if defined(INET) && defined(INET6)
516 /* Look up the hostname (or get the address) */
517 memset(&hints, 0, sizeof(hints));
518 hints.ai_socktype = SOCK_STREAM;
520 #if defined(INET) && defined(INET6)
521 ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) : PF_INET6;
527 gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
529 jail_warnx(j, "host.hostname %s: %s", hostname,
530 gai_strerror(gicode));
534 * Convert the addresses to ASCII so jailparam
535 * can convert them back. Errors are not
538 for (ai = ai0; ai; ai = ai->ai_next)
539 switch (ai->ai_family) {
543 &((struct sockaddr_in *)
544 (void *)ai->ai_addr)->
545 sin_addr, sizeof(addr4));
546 if (inet_ntop(AF_INET,
548 INET_ADDRSTRLEN) == NULL)
550 add_param(j, NULL, KP_IP4_ADDR,
557 &((struct sockaddr_in6 *)
558 (void *)ai->ai_addr)->
559 sin6_addr, sizeof(addr6));
560 if (inet_ntop(AF_INET6,
562 INET6_ADDRSTRLEN) == NULL)
564 add_param(j, NULL, KP_IP6_ADDR,
575 * IP addresses may include an interface to set that address on,
576 * and a netmask/suffix for that address.
578 defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
580 if (j->intparams[KP_IP4_ADDR] != NULL) {
581 TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
582 cs = strchr(s->s, '|');
584 add_param(j, NULL, IP__IP4_IFADDR, s->s);
586 strcpy(s->s, cs + 1);
587 s->len -= cs + 1 - s->s;
589 if ((cs = strchr(s->s, '/'))) {
590 prefix = strtol(cs + 1, &ep, 10);
592 ? inet_pton(AF_INET, cs + 1, &addr4) != 1
593 : *ep || prefix < 0 || prefix > 32) {
595 "ip4.addr: bad netmask \"%s\"", cs);
605 if (j->intparams[KP_IP6_ADDR] != NULL) {
606 TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
607 cs = strchr(s->s, '|');
609 add_param(j, NULL, IP__IP6_IFADDR, s->s);
611 strcpy(s->s, cs + 1);
612 s->len -= cs + 1 - s->s;
614 if ((cs = strchr(s->s, '/'))) {
615 prefix = strtol(cs + 1, &ep, 10);
616 if (*ep || prefix < 0 || prefix > 128) {
618 "ip6.addr: bad prefixlen \"%s\"",
631 * Read mount.fstab file(s), and treat each line as its own mount
634 if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
635 TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
638 f = fopen(s->s, "r");
640 jail_warnx(j, "mount.fstab: %s: %s",
641 s->s, strerror(errno));
645 while ((ln = fgetln(f, &lnlen))) {
646 if ((cs = memchr(ln, '#', lnlen - 1)))
648 if (ln[lnlen - 1] == '\n' ||
649 ln[lnlen - 1] == '#')
650 ln[lnlen - 1] = '\0';
652 cs = alloca(lnlen + 1);
653 strlcpy(cs, ln, lnlen + 1);
656 add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
667 * Import parameters into libjail's binary jailparam format.
670 import_params(struct cfjail *j)
673 struct cfstring *s, *ts;
674 struct jailparam *jp;
681 TAILQ_FOREACH(p, &j->params, tq)
682 if (!(p->flags & PF_INTERNAL))
684 j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
685 TAILQ_FOREACH(p, &j->params, tq) {
686 if (p->flags & PF_INTERNAL)
688 if (jailparam_init(jp, p->name) < 0) {
690 jail_warnx(j, "%s", jail_errmsg);
693 if (TAILQ_EMPTY(&p->val))
695 else if (!jp->jp_elemlen ||
696 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
698 * Scalar parameters silently discard multiple (array)
699 * values, keeping only the last value added. This
700 * lets values added from the command line append to
701 * arrays wthout pre-checking the type.
703 value = TAILQ_LAST(&p->val, cfstrings)->s;
706 * Convert arrays into comma-separated strings, which
707 * jailparam_import will then convert back into arrays.
710 TAILQ_FOREACH(s, &p->val, tq)
711 vallen += s->len + 1;
712 value = alloca(vallen);
714 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
715 memcpy(cs, s->s, s->len);
719 value[vallen - 1] = '\0';
721 if (jailparam_import(jp, value) < 0) {
723 jail_warnx(j, "%s", jail_errmsg);
728 jailparam_free(j->jp, j->njp);
737 * Check if options are equal (with or without the "no" prefix).
740 equalopts(const char *opt1, const char *opt2)
744 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
745 if (strcmp(opt1, opt2) == 0)
747 /* "noopt" vs. "opt" */
748 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
750 /* "opt" vs. "noopt" */
751 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
753 while ((p = strchr(opt1, '.')) != NULL &&
754 !strncmp(opt1, opt2, ++p - opt1)) {
757 /* "foo.noopt" vs. "foo.opt" */
758 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
760 /* "foo.opt" vs. "foo.noopt" */
761 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
768 * See if a jail name matches a wildcard.
771 wild_jail_match(const char *jname, const char *wname)
773 const char *jc, *jd, *wc, *wd;
776 * A non-final "*" component in the wild name matches a single jail
777 * component, and a final "*" matches one or more jail components.
779 for (jc = jname, wc = wname;
780 (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
781 jc = jd + 1, wc = wd + 1)
782 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
784 return (!strcmp(jc, wc) || !strcmp(wc, "*"));
788 * Return if a jail name is a wildcard.
791 wild_jail_name(const char *wname)
795 for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
796 if ((wc == wname || wc[-1] == '.') &&
797 (wc[1] == '\0' || wc[1] == '.'))
803 * Free a parameter record and all its strings and variables.
806 free_param(struct cfparams *pp, struct cfparam *p)
809 free_param_strings(p);
810 TAILQ_REMOVE(pp, p, tq);
815 free_param_strings(struct cfparam *p)
820 while ((s = TAILQ_FIRST(&p->val))) {
822 while ((v = STAILQ_FIRST(&s->vars))) {
824 STAILQ_REMOVE_HEAD(&s->vars, tq);
827 TAILQ_REMOVE(&p->val, s, tq);