1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011 James Gritton
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/types.h>
30 #include <sys/errno.h>
31 #include <sys/socket.h>
32 #include <sys/sysctl.h>
33
34 #include <arpa/inet.h>
35 #include <netinet/in.h>
36
37 #include <err.h>
38 #include <glob.h>
39 #include <netdb.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "jailp.h"
46
47 #define MAX_INCLUDE_DEPTH 32
48
49 struct ipspec {
50 const char *name;
51 unsigned flags;
52 };
53
54 extern int yylex_init_extra(struct cflex *extra, void *scanner);
55 extern int yylex_destroy(void *scanner);
56 extern int yyparse(void *scanner);
57 extern int yyset_in(FILE *fp, void *scanner);
58
59 struct cfjails cfjails = TAILQ_HEAD_INITIALIZER(cfjails);
60
61 static void parse_config(const char *fname, int is_stdin);
62 static void free_param(struct cfparams *pp, struct cfparam *p);
63
64 static const struct ipspec intparams[] = {
65 [IP_ALLOW_DYING] = {"allow.dying", PF_INTERNAL | PF_BOOL},
66 [IP_COMMAND] = {"command", PF_INTERNAL},
67 [IP_DEPEND] = {"depend", PF_INTERNAL},
68 [IP_EXEC_CLEAN] = {"exec.clean", PF_INTERNAL | PF_BOOL},
69 [IP_EXEC_CONSOLELOG] = {"exec.consolelog", PF_INTERNAL},
70 [IP_EXEC_FIB] = {"exec.fib", PF_INTERNAL | PF_INT},
71 [IP_EXEC_JAIL_USER] = {"exec.jail_user", PF_INTERNAL},
72 [IP_EXEC_POSTSTART] = {"exec.poststart", PF_INTERNAL},
73 [IP_EXEC_POSTSTOP] = {"exec.poststop", PF_INTERNAL},
74 [IP_EXEC_PREPARE] = {"exec.prepare", PF_INTERNAL},
75 [IP_EXEC_PRESTART] = {"exec.prestart", PF_INTERNAL},
76 [IP_EXEC_PRESTOP] = {"exec.prestop", PF_INTERNAL},
77 [IP_EXEC_RELEASE] = {"exec.release", PF_INTERNAL},
78 [IP_EXEC_CREATED] = {"exec.created", PF_INTERNAL},
79 [IP_EXEC_START] = {"exec.start", PF_INTERNAL},
80 [IP_EXEC_STOP] = {"exec.stop", PF_INTERNAL},
81 [IP_EXEC_SYSTEM_JAIL_USER]= {"exec.system_jail_user",
82 PF_INTERNAL | PF_BOOL},
83 [IP_EXEC_SYSTEM_USER] = {"exec.system_user", PF_INTERNAL},
84 [IP_EXEC_TIMEOUT] = {"exec.timeout", PF_INTERNAL | PF_INT},
85 #if defined(INET) || defined(INET6)
86 [IP_INTERFACE] = {"interface", PF_INTERNAL},
87 [IP_IP_HOSTNAME] = {"ip_hostname", PF_INTERNAL | PF_BOOL},
88 #endif
89 [IP_MOUNT] = {"mount", PF_INTERNAL | PF_REV},
90 [IP_MOUNT_DEVFS] = {"mount.devfs", PF_INTERNAL | PF_BOOL},
91 [IP_MOUNT_FDESCFS] = {"mount.fdescfs", PF_INTERNAL | PF_BOOL},
92 [IP_MOUNT_PROCFS] = {"mount.procfs", PF_INTERNAL | PF_BOOL},
93 [IP_MOUNT_FSTAB] = {"mount.fstab", PF_INTERNAL},
94 [IP_STOP_TIMEOUT] = {"stop.timeout", PF_INTERNAL | PF_INT},
95 [IP_VNET_INTERFACE] = {"vnet.interface", PF_INTERNAL},
96 [IP_ZFS_DATASET] = {"zfs.dataset", PF_INTERNAL},
97 #ifdef INET
98 [IP__IP4_IFADDR] = {"ip4.addr", PF_INTERNAL | PF_CONV | PF_REV},
99 #endif
100 #ifdef INET6
101 [IP__IP6_IFADDR] = {"ip6.addr", PF_INTERNAL | PF_CONV | PF_REV},
102 #endif
103 [IP__MOUNT_FROM_FSTAB] = {"mount.fstab", PF_INTERNAL | PF_CONV | PF_REV},
104 [IP__OP] = {NULL, PF_CONV},
105 [KP_ALLOW_CHFLAGS] = {"allow.chflags", 0},
106 [KP_ALLOW_MOUNT] = {"allow.mount", 0},
107 [KP_ALLOW_RAW_SOCKETS] = {"allow.raw_sockets", 0},
108 [KP_ALLOW_SET_HOSTNAME]= {"allow.set_hostname", 0},
109 [KP_ALLOW_SOCKET_AF] = {"allow.socket_af", 0},
110 [KP_ALLOW_SYSVIPC] = {"allow.sysvipc", 0},
111 [KP_DEVFS_RULESET] = {"devfs_ruleset", 0},
112 [KP_HOST_HOSTNAME] = {"host.hostname", 0},
113 #ifdef INET
114 [KP_IP4_ADDR] = {"ip4.addr", 0},
115 #endif
116 #ifdef INET6
117 [KP_IP6_ADDR] = {"ip6.addr", 0},
118 #endif
119 [KP_JID] = {"jid", PF_IMMUTABLE},
120 [KP_NAME] = {"name", PF_IMMUTABLE},
121 [KP_PATH] = {"path", 0},
122 [KP_PERSIST] = {"persist", 0},
123 [KP_SECURELEVEL] = {"securelevel", 0},
124 [KP_VNET] = {"vnet", 0},
125 };
126
127 /*
128 * Parse the jail configuration file.
129 */
130 void
load_config(const char * cfname)131 load_config(const char *cfname)
132 {
133 struct cfjails wild;
134 struct cfparams opp;
135 struct cfjail *j, *tj, *wj;
136 struct cfparam *p, *vp, *tp;
137 struct cfstring *s, *vs, *ns;
138 struct cfvar *v, *vv;
139 char *ep;
140 int did_self, jseq, pgen;
141
142 parse_config(cfname, !strcmp(cfname, "-"));
143
144 /* Separate the wildcard jails out from the actual jails. */
145 jseq = 0;
146 TAILQ_INIT(&wild);
147 TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
148 j->seq = ++jseq;
149 if (wild_jail_name(j->name))
150 requeue(j, &wild);
151 }
152
153 TAILQ_FOREACH(j, &cfjails, tq) {
154 /* Set aside the jail's parameters. */
155 TAILQ_INIT(&opp);
156 TAILQ_CONCAT(&opp, &j->params, tq);
157 /*
158 * The jail name implies its "name" or "jid" parameter,
159 * though they may also be explicitly set later on.
160 */
161 add_param(j, NULL,
162 strtol(j->name, &ep, 10) && !*ep ? KP_JID : KP_NAME,
163 j->name);
164 /*
165 * Collect parameters for the jail, global parameters/variables,
166 * and any matching wildcard jails.
167 */
168 did_self = 0;
169 TAILQ_FOREACH(wj, &wild, tq) {
170 if (j->seq < wj->seq && !did_self) {
171 TAILQ_FOREACH(p, &opp, tq)
172 add_param(j, p, 0, NULL);
173 did_self = 1;
174 }
175 if (wild_jail_match(j->name, wj->name))
176 TAILQ_FOREACH(p, &wj->params, tq)
177 add_param(j, p, 0, NULL);
178 }
179 if (!did_self)
180 TAILQ_FOREACH(p, &opp, tq)
181 add_param(j, p, 0, NULL);
182
183 /* Resolve any variable substitutions. */
184 pgen = 0;
185 TAILQ_FOREACH(p, &j->params, tq) {
186 p->gen = ++pgen;
187 find_vars:
188 TAILQ_FOREACH(s, &p->val, tq) {
189 while ((v = STAILQ_FIRST(&s->vars))) {
190 TAILQ_FOREACH(vp, &j->params, tq)
191 if (!strcmp(vp->name, v->name))
192 break;
193 if (!vp || TAILQ_EMPTY(&vp->val)) {
194 jail_warnx(j,
195 "%s: variable \"%s\" not found",
196 p->name, v->name);
197 bad_var:
198 j->flags |= JF_FAILED;
199 TAILQ_FOREACH(vp, &j->params, tq)
200 if (vp->gen == pgen)
201 vp->flags |= PF_BAD;
202 goto free_var;
203 }
204 if (vp->flags & PF_BAD)
205 goto bad_var;
206 if (vp->gen == pgen) {
207 jail_warnx(j, "%s: variable loop",
208 v->name);
209 goto bad_var;
210 }
211 TAILQ_FOREACH(vs, &vp->val, tq)
212 if (!STAILQ_EMPTY(&vs->vars)) {
213 vp->gen = pgen;
214 TAILQ_REMOVE(&j->params, vp,
215 tq);
216 TAILQ_INSERT_BEFORE(p, vp, tq);
217 p = vp;
218 goto find_vars;
219 }
220 vs = TAILQ_FIRST(&vp->val);
221 if (TAILQ_NEXT(vs, tq) != NULL &&
222 (s->s[0] != '\0' ||
223 STAILQ_NEXT(v, tq))) {
224 jail_warnx(j, "%s: array cannot be "
225 "substituted inline",
226 p->name);
227 goto bad_var;
228 }
229 s->s = erealloc(s->s, s->len + vs->len + 1);
230 memmove(s->s + v->pos + vs->len,
231 s->s + v->pos,
232 s->len - v->pos + 1);
233 memcpy(s->s + v->pos, vs->s, vs->len);
234 vv = v;
235 while ((vv = STAILQ_NEXT(vv, tq)))
236 vv->pos += vs->len;
237 s->len += vs->len;
238 while ((vs = TAILQ_NEXT(vs, tq))) {
239 ns = emalloc(sizeof(struct cfstring));
240 ns->s = estrdup(vs->s);
241 ns->len = vs->len;
242 STAILQ_INIT(&ns->vars);
243 TAILQ_INSERT_AFTER(&p->val, s, ns, tq);
244 s = ns;
245 }
246 free_var:
247 free(v->name);
248 STAILQ_REMOVE_HEAD(&s->vars, tq);
249 free(v);
250 }
251 }
252 }
253
254 /* Free the jail's original parameter list and any variables. */
255 while ((p = TAILQ_FIRST(&opp)))
256 free_param(&opp, p);
257 TAILQ_FOREACH_SAFE(p, &j->params, tq, tp)
258 if (p->flags & PF_VAR)
259 free_param(&j->params, p);
260 }
261 while ((wj = TAILQ_FIRST(&wild))) {
262 free(wj->name);
263 while ((p = TAILQ_FIRST(&wj->params)))
264 free_param(&wj->params, p);
265 TAILQ_REMOVE(&wild, wj, tq);
266 }
267 }
268
269 void
include_config(void * scanner,const char * cfname)270 include_config(void *scanner, const char *cfname)
271 {
272 static unsigned int depth;
273 glob_t g = {0};
274 const char *slash;
275 char *fullpath = NULL;
276
277 /* Simple sanity check for include loops. */
278 if (++depth > MAX_INCLUDE_DEPTH)
279 errx(1, "maximum include depth exceeded");
280 /* Base relative pathnames on the current config file. */
281 if (yyget_in(scanner) != stdin && cfname[0] != '/') {
282 const char *outer_cfname = yyget_extra(scanner)->cfname;
283 if ((slash = strrchr(outer_cfname, '/')) != NULL) {
284 size_t dirlen = (slash - outer_cfname) + 1;
285
286 fullpath = emalloc(dirlen + strlen(cfname) + 1);
287 strncpy(fullpath, outer_cfname, dirlen);
288 strcpy(fullpath + dirlen, cfname);
289 cfname = fullpath;
290 }
291 }
292 /*
293 * Check if the include statement had a filename glob.
294 * Globbing doesn't need to catch any files, but a non-glob
295 * file needs to exist (enforced by parse_config).
296 */
297 if (glob(cfname, GLOB_NOCHECK, NULL, &g) != 0)
298 errx(1, "%s: filename glob failed", cfname);
299 if (g.gl_flags & GLOB_MAGCHAR) {
300 for (size_t gi = 0; gi < g.gl_matchc; gi++)
301 parse_config(g.gl_pathv[gi], 0);
302 } else
303 parse_config(cfname, 0);
304 if (fullpath)
305 free(fullpath);
306 --depth;
307 }
308
309 static void
parse_config(const char * cfname,int is_stdin)310 parse_config(const char *cfname, int is_stdin)
311 {
312 struct cflex cflex = {.cfname = cfname, .error = 0};
313 void *scanner;
314
315 yylex_init_extra(&cflex, &scanner);
316 if (is_stdin) {
317 cflex.cfname = "STDIN";
318 yyset_in(stdin, scanner);
319 } else {
320 FILE *yfp = fopen(cfname, "r");
321 if (!yfp)
322 err(1, "%s", cfname);
323 yyset_in(yfp, scanner);
324 }
325 if (yyparse(scanner) || cflex.error)
326 exit(1);
327 yylex_destroy(scanner);
328 }
329
330 /*
331 * Create a new jail record.
332 */
333 struct cfjail *
add_jail(void)334 add_jail(void)
335 {
336 struct cfjail *j;
337
338 j = emalloc(sizeof(struct cfjail));
339 memset(j, 0, sizeof(struct cfjail));
340 TAILQ_INIT(&j->params);
341 STAILQ_INIT(&j->dep[DEP_FROM]);
342 STAILQ_INIT(&j->dep[DEP_TO]);
343 j->queue = &cfjails;
344 TAILQ_INSERT_TAIL(&cfjails, j, tq);
345 return j;
346 }
347
348 /*
349 * Add a parameter to a jail.
350 */
351 void
add_param(struct cfjail * j,const struct cfparam * p,enum intparam ipnum,const char * value)352 add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
353 const char *value)
354 {
355 struct cfstrings nss;
356 struct cfparam *dp, *np;
357 struct cfstring *s, *ns;
358 struct cfvar *v, *nv;
359 const char *name;
360 char *cs, *tname;
361 unsigned flags;
362
363 if (j == NULL) {
364 /* Create a single anonymous jail if one doesn't yet exist. */
365 j = TAILQ_LAST(&cfjails, cfjails);
366 if (j == NULL)
367 j = add_jail();
368 }
369 TAILQ_INIT(&nss);
370 if (p != NULL) {
371 name = p->name;
372 flags = p->flags;
373 /*
374 * Make a copy of the parameter's string list,
375 * which may be freed if it's overridden later.
376 */
377 TAILQ_FOREACH(s, &p->val, tq) {
378 ns = emalloc(sizeof(struct cfstring));
379 ns->s = estrdup(s->s);
380 ns->len = s->len;
381 STAILQ_INIT(&ns->vars);
382 STAILQ_FOREACH(v, &s->vars, tq) {
383 nv = emalloc(sizeof(struct cfvar));
384 nv->name = strdup(v->name);
385 nv->pos = v->pos;
386 STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
387 }
388 TAILQ_INSERT_TAIL(&nss, ns, tq);
389 }
390 } else {
391 flags = PF_APPEND;
392 if (ipnum != IP__NULL) {
393 name = intparams[ipnum].name;
394 flags |= intparams[ipnum].flags;
395 } else if ((cs = strchr(value, '='))) {
396 tname = alloca(cs - value + 1);
397 strlcpy(tname, value, cs - value + 1);
398 name = tname;
399 value = cs + 1;
400 } else {
401 name = value;
402 value = NULL;
403 }
404 if (value != NULL) {
405 ns = emalloc(sizeof(struct cfstring));
406 ns->s = estrdup(value);
407 ns->len = strlen(value);
408 STAILQ_INIT(&ns->vars);
409 TAILQ_INSERT_TAIL(&nss, ns, tq);
410 }
411 }
412
413 /* See if this parameter has already been added. */
414 if (ipnum != IP__NULL)
415 dp = j->intparams[ipnum];
416 else
417 TAILQ_FOREACH(dp, &j->params, tq)
418 if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
419 break;
420 if (dp != NULL) {
421 /* Found it - append or replace. */
422 if ((flags ^ dp->flags) & PF_VAR) {
423 jail_warnx(j, "variable \"$%s\" cannot have the same "
424 "name as a parameter.", name);
425 j->flags |= JF_FAILED;
426 return;
427 }
428 if (dp->flags & PF_IMMUTABLE) {
429 jail_warnx(j, "cannot redefine parameter \"%s\".",
430 dp->name);
431 j->flags |= JF_FAILED;
432 return;
433 }
434 if (strcmp(dp->name, name)) {
435 free(dp->name);
436 dp->name = estrdup(name);
437 }
438 if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
439 free_param_strings(dp);
440 TAILQ_CONCAT(&dp->val, &nss, tq);
441 dp->flags |= flags;
442 } else {
443 /* Not found - add it. */
444 np = emalloc(sizeof(struct cfparam));
445 np->name = estrdup(name);
446 TAILQ_INIT(&np->val);
447 TAILQ_CONCAT(&np->val, &nss, tq);
448 np->flags = flags;
449 np->gen = 0;
450 TAILQ_INSERT_TAIL(&j->params, np, tq);
451 if (ipnum != IP__NULL)
452 j->intparams[ipnum] = np;
453 else
454 for (ipnum = IP__NULL + 1; ipnum < IP_NPARAM; ipnum++)
455 if (!(intparams[ipnum].flags & PF_CONV) &&
456 equalopts(name, intparams[ipnum].name)) {
457 if (flags & PF_VAR) {
458 jail_warnx(j,
459 "variable \"$%s\" "
460 "cannot have the same "
461 "name as a parameter.",
462 name);
463 j->flags |= JF_FAILED;
464 return;
465 }
466 j->intparams[ipnum] = np;
467 np->flags |= intparams[ipnum].flags;
468 break;
469 }
470 }
471 }
472
473 /*
474 * Return if a boolean parameter exists and is true.
475 */
476 int
bool_param(const struct cfparam * p)477 bool_param(const struct cfparam *p)
478 {
479 const char *cs;
480
481 if (p == NULL)
482 return 0;
483 cs = strrchr(p->name, '.');
484 return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
485 (TAILQ_EMPTY(&p->val) ||
486 !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
487 (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
488 }
489
490 /*
491 * Set an integer if a parameter if it exists.
492 */
493 int
int_param(const struct cfparam * p,int * ip)494 int_param(const struct cfparam *p, int *ip)
495 {
496 if (p == NULL || TAILQ_EMPTY(&p->val))
497 return 0;
498 *ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
499 return 1;
500 }
501
502 /*
503 * Return the string value of a scalar parameter if it exists.
504 */
505 const char *
string_param(const struct cfparam * p)506 string_param(const struct cfparam *p)
507 {
508 return (p && !TAILQ_EMPTY(&p->val)
509 ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
510 }
511
512 /*
513 * Check syntax and values of internal parameters. Set some internal
514 * parameters based on the values of others.
515 */
516 int
check_intparams(struct cfjail * j)517 check_intparams(struct cfjail *j)
518 {
519 struct cfparam *p;
520 struct cfstring *s;
521 FILE *f;
522 const char *val;
523 char *cs, *ep, *ln;
524 size_t lnlen;
525 int error;
526 #if defined(INET) || defined(INET6)
527 struct addrinfo hints;
528 struct addrinfo *ai0, *ai;
529 const char *hostname;
530 int gicode, defif;
531 #endif
532 #ifdef INET
533 struct in_addr addr4;
534 int ip4ok;
535 char avalue4[INET_ADDRSTRLEN];
536 #endif
537 #ifdef INET6
538 struct in6_addr addr6;
539 int ip6ok;
540 char avalue6[INET6_ADDRSTRLEN];
541 #endif
542
543 error = 0;
544 /* Check format of boolan and integer values. */
545 TAILQ_FOREACH(p, &j->params, tq) {
546 if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
547 val = TAILQ_LAST(&p->val, cfstrings)->s;
548 if (p->flags & PF_BOOL) {
549 if (strcasecmp(val, "false") &&
550 strcasecmp(val, "true") &&
551 ((void)strtol(val, &ep, 10), *ep)) {
552 jail_warnx(j,
553 "%s: unknown boolean value \"%s\"",
554 p->name, val);
555 error = -1;
556 }
557 } else {
558 (void)strtol(val, &ep, 10);
559 if (ep == val || *ep) {
560 jail_warnx(j,
561 "%s: non-integer value \"%s\"",
562 p->name, val);
563 error = -1;
564 }
565 }
566 }
567 }
568
569 #if defined(INET) || defined(INET6)
570 /*
571 * The ip_hostname parameter looks up the hostname, and adds parameters
572 * for any IP addresses it finds.
573 */
574 if (((j->flags & JF_OP_MASK) != JF_STOP ||
575 j->intparams[IP_INTERFACE] != NULL) &&
576 bool_param(j->intparams[IP_IP_HOSTNAME]) &&
577 (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
578 j->intparams[IP_IP_HOSTNAME] = NULL;
579 /*
580 * Silently ignore unsupported address families from
581 * DNS lookups.
582 */
583 #ifdef INET
584 ip4ok = feature_present("inet");
585 #endif
586 #ifdef INET6
587 ip6ok = feature_present("inet6");
588 #endif
589 if (
590 #if defined(INET) && defined(INET6)
591 ip4ok || ip6ok
592 #elif defined(INET)
593 ip4ok
594 #elif defined(INET6)
595 ip6ok
596 #endif
597 ) {
598 /* Look up the hostname (or get the address) */
599 memset(&hints, 0, sizeof(hints));
600 hints.ai_socktype = SOCK_STREAM;
601 hints.ai_family =
602 #if defined(INET) && defined(INET6)
603 ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) : PF_INET6;
604 #elif defined(INET)
605 PF_INET;
606 #elif defined(INET6)
607 PF_INET6;
608 #endif
609 gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
610 if (gicode != 0) {
611 jail_warnx(j, "host.hostname %s: %s", hostname,
612 gai_strerror(gicode));
613 error = -1;
614 } else {
615 /*
616 * Convert the addresses to ASCII so jailparam
617 * can convert them back. Errors are not
618 * expected here.
619 */
620 for (ai = ai0; ai; ai = ai->ai_next)
621 switch (ai->ai_family) {
622 #ifdef INET
623 case AF_INET:
624 memcpy(&addr4,
625 &((struct sockaddr_in *)
626 (void *)ai->ai_addr)->
627 sin_addr, sizeof(addr4));
628 if (inet_ntop(AF_INET,
629 &addr4, avalue4,
630 INET_ADDRSTRLEN) == NULL)
631 err(1, "inet_ntop");
632 add_param(j, NULL, KP_IP4_ADDR,
633 avalue4);
634 break;
635 #endif
636 #ifdef INET6
637 case AF_INET6:
638 memcpy(&addr6,
639 &((struct sockaddr_in6 *)
640 (void *)ai->ai_addr)->
641 sin6_addr, sizeof(addr6));
642 if (inet_ntop(AF_INET6,
643 &addr6, avalue6,
644 INET6_ADDRSTRLEN) == NULL)
645 err(1, "inet_ntop");
646 add_param(j, NULL, KP_IP6_ADDR,
647 avalue6);
648 break;
649 #endif
650 }
651 freeaddrinfo(ai0);
652 }
653 }
654 }
655
656 /*
657 * IP addresses may include an interface to set that address on,
658 * a netmask/suffix for that address and options for ifconfig.
659 * These are copied to an internal command parameter and then stripped
660 * so they won't be passed on to jailparam_set.
661 */
662 defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
663 #ifdef INET
664 if (j->intparams[KP_IP4_ADDR] != NULL) {
665 TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
666 cs = strchr(s->s, '|');
667 if (cs || defif)
668 add_param(j, NULL, IP__IP4_IFADDR, s->s);
669 if (cs) {
670 s->len -= cs + 1 - s->s;
671 memmove(s->s, cs + 1, s->len + 1);
672 }
673 if ((cs = strchr(s->s, '/')) != NULL) {
674 *cs = '\0';
675 s->len = cs - s->s;
676 }
677 if ((cs = strchr(s->s, ' ')) != NULL) {
678 *cs = '\0';
679 s->len = cs - s->s;
680 }
681 }
682 }
683 #endif
684 #ifdef INET6
685 if (j->intparams[KP_IP6_ADDR] != NULL) {
686 TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
687 cs = strchr(s->s, '|');
688 if (cs || defif)
689 add_param(j, NULL, IP__IP6_IFADDR, s->s);
690 if (cs) {
691 s->len -= cs + 1 - s->s;
692 memmove(s->s, cs + 1, s->len + 1);
693 }
694 if ((cs = strchr(s->s, '/')) != NULL) {
695 *cs = '\0';
696 s->len = cs - s->s;
697 }
698 if ((cs = strchr(s->s, ' ')) != NULL) {
699 *cs = '\0';
700 s->len = cs - s->s;
701 }
702 }
703 }
704 #endif
705 #endif
706
707 /*
708 * Read mount.fstab file(s), and treat each line as its own mount
709 * parameter.
710 */
711 if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
712 TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
713 if (s->len == 0)
714 continue;
715 f = fopen(s->s, "r");
716 if (f == NULL) {
717 jail_warnx(j, "mount.fstab: %s: %s",
718 s->s, strerror(errno));
719 error = -1;
720 continue;
721 }
722 while ((ln = fgetln(f, &lnlen))) {
723 if ((cs = memchr(ln, '#', lnlen - 1)))
724 lnlen = cs - ln + 1;
725 if (ln[lnlen - 1] == '\n' ||
726 ln[lnlen - 1] == '#')
727 ln[lnlen - 1] = '\0';
728 else {
729 cs = alloca(lnlen + 1);
730 strlcpy(cs, ln, lnlen + 1);
731 ln = cs;
732 }
733 add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
734 }
735 fclose(f);
736 }
737 }
738 if (error)
739 failed(j);
740 return error;
741 }
742
743 /*
744 * Import parameters into libjail's binary jailparam format.
745 */
746 int
import_params(struct cfjail * j)747 import_params(struct cfjail *j)
748 {
749 struct cfparam *p;
750 struct cfstring *s, *ts;
751 struct jailparam *jp;
752 char *value, *cs;
753 size_t vallen;
754 int error;
755
756 error = 0;
757 j->njp = 0;
758 TAILQ_FOREACH(p, &j->params, tq)
759 if (!(p->flags & PF_INTERNAL))
760 j->njp++;
761 j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
762 TAILQ_FOREACH(p, &j->params, tq) {
763 if (p->flags & PF_INTERNAL)
764 continue;
765 if (jailparam_init(jp, p->name) < 0) {
766 error = -1;
767 jail_warnx(j, "%s", jail_errmsg);
768 jp++;
769 continue;
770 }
771 if (TAILQ_EMPTY(&p->val))
772 value = NULL;
773 else if (!jp->jp_elemlen ||
774 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
775 /*
776 * Scalar parameters silently discard multiple (array)
777 * values, keeping only the last value added. This
778 * lets values added from the command line append to
779 * arrays wthout pre-checking the type.
780 */
781 value = TAILQ_LAST(&p->val, cfstrings)->s;
782 } else {
783 /*
784 * Convert arrays into comma-separated strings, which
785 * jailparam_import will then convert back into arrays.
786 */
787 vallen = 0;
788 TAILQ_FOREACH(s, &p->val, tq)
789 vallen += s->len + 1;
790 value = alloca(vallen);
791 cs = value;
792 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
793 memcpy(cs, s->s, s->len);
794 cs += s->len + 1;
795 cs[-1] = ',';
796 }
797 value[vallen - 1] = '\0';
798 }
799 if (jailparam_import(jp, value) < 0) {
800 error = -1;
801 jail_warnx(j, "%s", jail_errmsg);
802 }
803 jp++;
804 }
805 if (error) {
806 jailparam_free(j->jp, j->njp);
807 free(j->jp);
808 j->jp = NULL;
809 failed(j);
810 }
811 return error;
812 }
813
814 /*
815 * Check if options are equal (with or without the "no" prefix).
816 */
817 int
equalopts(const char * opt1,const char * opt2)818 equalopts(const char *opt1, const char *opt2)
819 {
820 char *p;
821
822 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
823 if (strcmp(opt1, opt2) == 0)
824 return (1);
825 /* "noopt" vs. "opt" */
826 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
827 return (1);
828 /* "opt" vs. "noopt" */
829 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
830 return (1);
831 while ((p = strchr(opt1, '.')) != NULL &&
832 !strncmp(opt1, opt2, ++p - opt1)) {
833 opt2 += p - opt1;
834 opt1 = p;
835 /* "foo.noopt" vs. "foo.opt" */
836 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
837 return (1);
838 /* "foo.opt" vs. "foo.noopt" */
839 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
840 return (1);
841 }
842 return (0);
843 }
844
845 /*
846 * See if a jail name matches a wildcard.
847 */
848 int
wild_jail_match(const char * jname,const char * wname)849 wild_jail_match(const char *jname, const char *wname)
850 {
851 const char *jc, *jd, *wc, *wd;
852
853 /*
854 * A non-final "*" component in the wild name matches a single jail
855 * component, and a final "*" matches one or more jail components.
856 */
857 for (jc = jname, wc = wname;
858 (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
859 jc = jd + 1, wc = wd + 1)
860 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
861 return 0;
862 return (!strcmp(jc, wc) || !strcmp(wc, "*"));
863 }
864
865 /*
866 * Return if a jail name is a wildcard.
867 */
868 int
wild_jail_name(const char * wname)869 wild_jail_name(const char *wname)
870 {
871 const char *wc;
872
873 for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
874 if ((wc == wname || wc[-1] == '.') &&
875 (wc[1] == '\0' || wc[1] == '.'))
876 return 1;
877 return 0;
878 }
879
880 /*
881 * Free a parameter record and all its strings and variables.
882 */
883 static void
free_param(struct cfparams * pp,struct cfparam * p)884 free_param(struct cfparams *pp, struct cfparam *p)
885 {
886 free(p->name);
887 free_param_strings(p);
888 TAILQ_REMOVE(pp, p, tq);
889 free(p);
890 }
891
892 void
free_param_strings(struct cfparam * p)893 free_param_strings(struct cfparam *p)
894 {
895 struct cfstring *s;
896 struct cfvar *v;
897
898 while ((s = TAILQ_FIRST(&p->val))) {
899 free(s->s);
900 while ((v = STAILQ_FIRST(&s->vars))) {
901 free(v->name);
902 STAILQ_REMOVE_HEAD(&s->vars, tq);
903 free(v);
904 }
905 TAILQ_REMOVE(&p->val, s, tq);
906 free(s);
907 }
908 }
909