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 extern int yyparse(void);
57 struct cfjails cfjails = TAILQ_HEAD_INITIALIZER(cfjails);
59 static void free_param(struct cfparams *pp, struct cfparam *p);
60 static void free_param_strings(struct cfparam *p);
62 static const struct ipspec intparams[] = {
63 [IP_ALLOW_DYING] = {"allow.dying", PF_INTERNAL | PF_BOOL},
64 [IP_COMMAND] = {"command", PF_INTERNAL},
65 [IP_DEPEND] = {"depend", PF_INTERNAL},
66 [IP_EXEC_CLEAN] = {"exec.clean", PF_INTERNAL | PF_BOOL},
67 [IP_EXEC_CONSOLELOG] = {"exec.consolelog", PF_INTERNAL},
68 [IP_EXEC_FIB] = {"exec.fib", PF_INTERNAL | PF_INT},
69 [IP_EXEC_JAIL_USER] = {"exec.jail_user", PF_INTERNAL},
70 [IP_EXEC_POSTSTART] = {"exec.poststart", PF_INTERNAL},
71 [IP_EXEC_POSTSTOP] = {"exec.poststop", PF_INTERNAL},
72 [IP_EXEC_PRESTART] = {"exec.prestart", PF_INTERNAL},
73 [IP_EXEC_PRESTOP] = {"exec.prestop", PF_INTERNAL},
74 [IP_EXEC_START] = {"exec.start", PF_INTERNAL},
75 [IP_EXEC_STOP] = {"exec.stop", PF_INTERNAL},
76 [IP_EXEC_SYSTEM_JAIL_USER]= {"exec.system_jail_user",
77 PF_INTERNAL | PF_BOOL},
78 [IP_EXEC_SYSTEM_USER] = {"exec.system_user", PF_INTERNAL},
79 [IP_EXEC_TIMEOUT] = {"exec.timeout", PF_INTERNAL | PF_INT},
80 #if defined(INET) || defined(INET6)
81 [IP_INTERFACE] = {"interface", PF_INTERNAL},
82 [IP_IP_HOSTNAME] = {"ip_hostname", PF_INTERNAL | PF_BOOL},
84 [IP_MOUNT] = {"mount", PF_INTERNAL | PF_REV},
85 [IP_MOUNT_DEVFS] = {"mount.devfs", PF_INTERNAL | PF_BOOL},
86 [IP_MOUNT_FDESCFS] = {"mount.fdescfs", PF_INTERNAL | PF_BOOL},
87 [IP_MOUNT_FSTAB] = {"mount.fstab", PF_INTERNAL},
88 [IP_STOP_TIMEOUT] = {"stop.timeout", PF_INTERNAL | PF_INT},
89 [IP_VNET_INTERFACE] = {"vnet.interface", PF_INTERNAL},
91 [IP__IP4_IFADDR] = {"ip4.addr", PF_INTERNAL | PF_CONV | PF_REV},
94 [IP__IP6_IFADDR] = {"ip6.addr", PF_INTERNAL | PF_CONV | PF_REV},
96 [IP__MOUNT_FROM_FSTAB] = {"mount.fstab", PF_INTERNAL | PF_CONV | PF_REV},
97 [IP__OP] = {NULL, PF_CONV},
98 [KP_ALLOW_CHFLAGS] = {"allow.chflags", 0},
99 [KP_ALLOW_MOUNT] = {"allow.mount", 0},
100 [KP_ALLOW_RAW_SOCKETS] = {"allow.raw_sockets", 0},
101 [KP_ALLOW_SET_HOSTNAME]= {"allow.set_hostname", 0},
102 [KP_ALLOW_SOCKET_AF] = {"allow.socket_af", 0},
103 [KP_ALLOW_SYSVIPC] = {"allow.sysvipc", 0},
104 [KP_DEVFS_RULESET] = {"devfs_ruleset", 0},
105 [KP_ENFORCE_STATFS] = {"enforce_statfs", 0},
106 [KP_HOST_HOSTNAME] = {"host.hostname", 0},
108 [KP_IP4_ADDR] = {"ip4.addr", 0},
111 [KP_IP6_ADDR] = {"ip6.addr", 0},
113 [KP_JID] = {"jid", 0},
114 [KP_NAME] = {"name", 0},
115 [KP_PATH] = {"path", 0},
116 [KP_PERSIST] = {"persist", 0},
117 [KP_SECURELEVEL] = {"securelevel", 0},
118 [KP_VNET] = {"vnet", 0},
122 * Parse the jail configuration file.
129 struct cfjail *j, *tj, *wj;
130 struct cfparam *p, *vp, *tp;
131 struct cfstring *s, *vs, *ns;
135 int did_self, jseq, pgen;
137 if (!strcmp(cfname, "-")) {
141 yyin = fopen(cfname, "r");
143 err(1, "%s", cfname);
145 if (yyparse() || yynerrs)
148 /* Separate the wildcard jails out from the actual jails. */
151 TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
153 if (wild_jail_name(j->name))
157 TAILQ_FOREACH(j, &cfjails, tq) {
158 /* Set aside the jail's parameters. */
160 TAILQ_CONCAT(&opp, &j->params, tq);
162 * The jail name implies its "name" or "jid" parameter,
163 * though they may also be explicitly set later on.
166 strtol(j->name, &ep, 10) && !*ep ? KP_JID : KP_NAME,
169 * Collect parameters for the jail, global parameters/variables,
170 * and any matching wildcard jails.
173 TAILQ_FOREACH(wj, &wild, tq) {
174 if (j->seq < wj->seq && !did_self) {
175 TAILQ_FOREACH(p, &opp, tq)
176 add_param(j, p, 0, NULL);
179 if (wild_jail_match(j->name, wj->name))
180 TAILQ_FOREACH(p, &wj->params, tq)
181 add_param(j, p, 0, NULL);
184 TAILQ_FOREACH(p, &opp, tq)
185 add_param(j, p, 0, NULL);
187 /* Resolve any variable substitutions. */
189 TAILQ_FOREACH(p, &j->params, tq) {
192 TAILQ_FOREACH(s, &p->val, tq) {
194 while ((v = STAILQ_FIRST(&s->vars))) {
195 TAILQ_FOREACH(vp, &j->params, tq)
196 if (!strcmp(vp->name, v->name))
200 "%s: variable \"%s\" not found",
203 j->flags |= JF_FAILED;
204 TAILQ_FOREACH(vp, &j->params, tq)
209 if (vp->flags & PF_BAD)
211 if (vp->gen == pgen) {
212 jail_warnx(j, "%s: variable loop",
216 TAILQ_FOREACH(vs, &vp->val, tq)
217 if (!STAILQ_EMPTY(&vs->vars)) {
219 TAILQ_REMOVE(&j->params, vp,
221 TAILQ_INSERT_BEFORE(p, vp, tq);
225 vs = TAILQ_FIRST(&vp->val);
226 if (TAILQ_NEXT(vs, tq) != NULL &&
228 STAILQ_NEXT(v, tq))) {
229 jail_warnx(j, "%s: array cannot be "
230 "substituted inline",
234 s->s = erealloc(s->s, s->len + vs->len + 1);
235 memmove(s->s + v->pos + varoff + vs->len,
236 s->s + v->pos + varoff,
237 s->len - (v->pos + varoff) + 1);
238 memcpy(s->s + v->pos + varoff, vs->s, vs->len);
241 while ((vs = TAILQ_NEXT(vs, tq))) {
242 ns = emalloc(sizeof(struct cfstring));
243 ns->s = estrdup(vs->s);
245 STAILQ_INIT(&ns->vars);
246 TAILQ_INSERT_AFTER(&p->val, s, ns, tq);
251 STAILQ_REMOVE_HEAD(&s->vars, tq);
257 /* Free the jail's original parameter list and any variables. */
258 while ((p = TAILQ_FIRST(&opp)))
260 TAILQ_FOREACH_SAFE(p, &j->params, tq, tp)
261 if (p->flags & PF_VAR)
262 free_param(&j->params, p);
264 while ((wj = TAILQ_FIRST(&wild))) {
266 while ((p = TAILQ_FIRST(&wj->params)))
267 free_param(&wj->params, p);
268 TAILQ_REMOVE(&wild, wj, tq);
273 * Create a new jail record.
280 j = emalloc(sizeof(struct cfjail));
281 memset(j, 0, sizeof(struct cfjail));
282 TAILQ_INIT(&j->params);
283 STAILQ_INIT(&j->dep[DEP_FROM]);
284 STAILQ_INIT(&j->dep[DEP_TO]);
286 TAILQ_INSERT_TAIL(&cfjails, j, tq);
291 * Add a parameter to a jail.
294 add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
297 struct cfstrings nss;
298 struct cfparam *dp, *np;
299 struct cfstring *s, *ns;
300 struct cfvar *v, *nv;
306 /* Create a single anonymous jail if one doesn't yet exist. */
307 j = TAILQ_LAST(&cfjails, cfjails);
316 * Make a copy of the parameter's string list,
317 * which may be freed if it's overridden later.
319 TAILQ_FOREACH(s, &p->val, tq) {
320 ns = emalloc(sizeof(struct cfstring));
321 ns->s = estrdup(s->s);
323 STAILQ_INIT(&ns->vars);
324 STAILQ_FOREACH(v, &s->vars, tq) {
325 nv = emalloc(sizeof(struct cfvar));
326 nv->name = strdup(v->name);
328 STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
330 TAILQ_INSERT_TAIL(&nss, ns, tq);
334 if (ipnum != IP__NULL) {
335 name = intparams[ipnum].name;
336 flags |= intparams[ipnum].flags;
337 } else if ((cs = strchr(value, '='))) {
338 tname = alloca(cs - value + 1);
339 strlcpy(tname, value, cs - value + 1);
347 ns = emalloc(sizeof(struct cfstring));
348 ns->s = estrdup(value);
349 ns->len = strlen(value);
350 STAILQ_INIT(&ns->vars);
351 TAILQ_INSERT_TAIL(&nss, ns, tq);
355 /* See if this parameter has already been added. */
356 if (ipnum != IP__NULL)
357 dp = j->intparams[ipnum];
359 TAILQ_FOREACH(dp, &j->params, tq)
360 if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
363 /* Found it - append or replace. */
364 if (strcmp(dp->name, name)) {
366 dp->name = estrdup(name);
368 if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
369 free_param_strings(dp);
370 TAILQ_CONCAT(&dp->val, &nss, tq);
373 /* Not found - add it. */
374 np = emalloc(sizeof(struct cfparam));
375 np->name = estrdup(name);
376 TAILQ_INIT(&np->val);
377 TAILQ_CONCAT(&np->val, &nss, tq);
380 TAILQ_INSERT_TAIL(&j->params, np, tq);
381 if (ipnum != IP__NULL)
382 j->intparams[ipnum] = np;
384 for (ipnum = IP__NULL + 1; ipnum < IP_NPARAM; ipnum++)
385 if (!(intparams[ipnum].flags & PF_CONV) &&
386 equalopts(name, intparams[ipnum].name)) {
387 j->intparams[ipnum] = np;
388 np->flags |= intparams[ipnum].flags;
395 * Return if a boolean parameter exists and is true.
398 bool_param(const struct cfparam *p)
404 cs = strrchr(p->name, '.');
405 return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
406 (TAILQ_EMPTY(&p->val) ||
407 !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
408 (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
412 * Set an integer if a parameter if it exists.
415 int_param(const struct cfparam *p, int *ip)
417 if (p == NULL || TAILQ_EMPTY(&p->val))
419 *ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
424 * Return the string value of a scalar parameter if it exists.
427 string_param(const struct cfparam *p)
429 return (p && !TAILQ_EMPTY(&p->val)
430 ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
434 * Check syntax and values of internal parameters. Set some internal
435 * parameters based on the values of others.
438 check_intparams(struct cfjail *j)
447 #if defined(INET) || defined(INET6)
448 struct addrinfo hints;
449 struct addrinfo *ai0, *ai;
450 const char *hostname;
451 int gicode, defif, prefix;
454 struct in_addr addr4;
456 char avalue4[INET_ADDRSTRLEN];
459 struct in6_addr addr6;
461 char avalue6[INET6_ADDRSTRLEN];
465 /* Check format of boolan and integer values. */
466 TAILQ_FOREACH(p, &j->params, tq) {
467 if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
468 val = TAILQ_LAST(&p->val, cfstrings)->s;
469 if (p->flags & PF_BOOL) {
470 if (strcasecmp(val, "false") &&
471 strcasecmp(val, "true") &&
472 ((void)strtol(val, &ep, 10), *ep)) {
474 "%s: unknown boolean value \"%s\"",
479 (void)strtol(val, &ep, 10);
480 if (ep == val || *ep) {
482 "%s: non-integer value \"%s\"",
490 #if defined(INET) || defined(INET6)
492 * The ip_hostname parameter looks up the hostname, and adds parameters
493 * for any IP addresses it finds.
495 if (((j->flags & JF_OP_MASK) != JF_STOP ||
496 j->intparams[IP_INTERFACE] != NULL) &&
497 bool_param(j->intparams[IP_IP_HOSTNAME]) &&
498 (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
499 j->intparams[IP_IP_HOSTNAME] = NULL;
501 * Silently ignore unsupported address families from
505 ip4ok = feature_present("inet");
508 ip6ok = feature_present("inet6");
511 #if defined(INET) && defined(INET6)
519 /* Look up the hostname (or get the address) */
520 memset(&hints, 0, sizeof(hints));
521 hints.ai_socktype = SOCK_STREAM;
523 #if defined(INET) && defined(INET6)
524 ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) : PF_INET6;
530 gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
532 jail_warnx(j, "host.hostname %s: %s", hostname,
533 gai_strerror(gicode));
537 * Convert the addresses to ASCII so jailparam
538 * can convert them back. Errors are not
541 for (ai = ai0; ai; ai = ai->ai_next)
542 switch (ai->ai_family) {
546 &((struct sockaddr_in *)
547 (void *)ai->ai_addr)->
548 sin_addr, sizeof(addr4));
549 if (inet_ntop(AF_INET,
551 INET_ADDRSTRLEN) == NULL)
553 add_param(j, NULL, KP_IP4_ADDR,
560 &((struct sockaddr_in6 *)
561 (void *)ai->ai_addr)->
562 sin6_addr, sizeof(addr6));
563 if (inet_ntop(AF_INET6,
565 INET6_ADDRSTRLEN) == NULL)
567 add_param(j, NULL, KP_IP6_ADDR,
578 * IP addresses may include an interface to set that address on,
579 * and a netmask/suffix for that address.
581 defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
583 if (j->intparams[KP_IP4_ADDR] != NULL) {
584 TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
585 cs = strchr(s->s, '|');
587 add_param(j, NULL, IP__IP4_IFADDR, s->s);
589 strcpy(s->s, cs + 1);
590 s->len -= cs + 1 - s->s;
592 if ((cs = strchr(s->s, '/'))) {
593 prefix = strtol(cs + 1, &ep, 10);
595 ? inet_pton(AF_INET, cs + 1, &addr4) != 1
596 : *ep || prefix < 0 || prefix > 32) {
598 "ip4.addr: bad netmask \"%s\"", cs);
608 if (j->intparams[KP_IP6_ADDR] != NULL) {
609 TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
610 cs = strchr(s->s, '|');
612 add_param(j, NULL, IP__IP6_IFADDR, s->s);
614 strcpy(s->s, cs + 1);
615 s->len -= cs + 1 - s->s;
617 if ((cs = strchr(s->s, '/'))) {
618 prefix = strtol(cs + 1, &ep, 10);
619 if (*ep || prefix < 0 || prefix > 128) {
621 "ip6.addr: bad prefixlen \"%s\"",
634 * Read mount.fstab file(s), and treat each line as its own mount
637 if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
638 TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
641 f = fopen(s->s, "r");
643 jail_warnx(j, "mount.fstab: %s: %s",
644 s->s, strerror(errno));
648 while ((ln = fgetln(f, &lnlen))) {
649 if ((cs = memchr(ln, '#', lnlen - 1)))
651 if (ln[lnlen - 1] == '\n' ||
652 ln[lnlen - 1] == '#')
653 ln[lnlen - 1] = '\0';
655 cs = alloca(lnlen + 1);
656 strlcpy(cs, ln, lnlen + 1);
659 add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
670 * Import parameters into libjail's binary jailparam format.
673 import_params(struct cfjail *j)
676 struct cfstring *s, *ts;
677 struct jailparam *jp;
684 TAILQ_FOREACH(p, &j->params, tq)
685 if (!(p->flags & PF_INTERNAL))
687 j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
688 TAILQ_FOREACH(p, &j->params, tq) {
689 if (p->flags & PF_INTERNAL)
691 if (jailparam_init(jp, p->name) < 0) {
693 jail_warnx(j, "%s", jail_errmsg);
697 if (TAILQ_EMPTY(&p->val))
699 else if (!jp->jp_elemlen ||
700 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
702 * Scalar parameters silently discard multiple (array)
703 * values, keeping only the last value added. This
704 * lets values added from the command line append to
705 * arrays wthout pre-checking the type.
707 value = TAILQ_LAST(&p->val, cfstrings)->s;
710 * Convert arrays into comma-separated strings, which
711 * jailparam_import will then convert back into arrays.
714 TAILQ_FOREACH(s, &p->val, tq)
715 vallen += s->len + 1;
716 value = alloca(vallen);
718 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
719 memcpy(cs, s->s, s->len);
723 value[vallen - 1] = '\0';
725 if (jailparam_import(jp, value) < 0) {
727 jail_warnx(j, "%s", jail_errmsg);
732 jailparam_free(j->jp, j->njp);
741 * Check if options are equal (with or without the "no" prefix).
744 equalopts(const char *opt1, const char *opt2)
748 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
749 if (strcmp(opt1, opt2) == 0)
751 /* "noopt" vs. "opt" */
752 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
754 /* "opt" vs. "noopt" */
755 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
757 while ((p = strchr(opt1, '.')) != NULL &&
758 !strncmp(opt1, opt2, ++p - opt1)) {
761 /* "foo.noopt" vs. "foo.opt" */
762 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
764 /* "foo.opt" vs. "foo.noopt" */
765 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
772 * See if a jail name matches a wildcard.
775 wild_jail_match(const char *jname, const char *wname)
777 const char *jc, *jd, *wc, *wd;
780 * A non-final "*" component in the wild name matches a single jail
781 * component, and a final "*" matches one or more jail components.
783 for (jc = jname, wc = wname;
784 (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
785 jc = jd + 1, wc = wd + 1)
786 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
788 return (!strcmp(jc, wc) || !strcmp(wc, "*"));
792 * Return if a jail name is a wildcard.
795 wild_jail_name(const char *wname)
799 for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
800 if ((wc == wname || wc[-1] == '.') &&
801 (wc[1] == '\0' || wc[1] == '.'))
807 * Free a parameter record and all its strings and variables.
810 free_param(struct cfparams *pp, struct cfparam *p)
813 free_param_strings(p);
814 TAILQ_REMOVE(pp, p, tq);
819 free_param_strings(struct cfparam *p)
824 while ((s = TAILQ_FIRST(&p->val))) {
826 while ((v = STAILQ_FIRST(&s->vars))) {
828 STAILQ_REMOVE_HEAD(&s->vars, tq);
831 TAILQ_REMOVE(&p->val, s, tq);