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. After we
160 * collect other parameters, we'll go back and ensure they're
161 * both set if we need to do so here.
162 */
163 add_param(j, NULL,
164 strtol(j->name, &ep, 10) && !*ep ? KP_JID : KP_NAME,
165 j->name);
166
167 /*
168 * Collect parameters for the jail, global parameters/variables,
169 * and any matching wildcard jails.
170 */
171 did_self = 0;
172 TAILQ_FOREACH(wj, &wild, tq) {
173 if (j->seq < wj->seq && !did_self) {
174 TAILQ_FOREACH(p, &opp, tq)
175 add_param(j, p, 0, NULL);
176 did_self = 1;
177 }
178 if (wild_jail_match(j->name, wj->name))
179 TAILQ_FOREACH(p, &wj->params, tq)
180 add_param(j, p, 0, NULL);
181 }
182 if (!did_self)
183 TAILQ_FOREACH(p, &opp, tq)
184 add_param(j, p, 0, NULL);
185
186 /*
187 * We only backfill if it's the name that wasn't set; if it was
188 * the jid, we can assume that will be populated later when the
189 * jail is created or found.
190 */
191 if (j->intparams[KP_NAME] == NULL)
192 add_param(j, j->intparams[KP_JID], KP_NAME, NULL);
193
194 /* Resolve any variable substitutions. */
195 pgen = 0;
196 TAILQ_FOREACH(p, &j->params, tq) {
197 p->gen = ++pgen;
198 find_vars:
199 TAILQ_FOREACH(s, &p->val, tq) {
200 while ((v = STAILQ_FIRST(&s->vars))) {
201 TAILQ_FOREACH(vp, &j->params, tq)
202 if (!strcmp(vp->name, v->name))
203 break;
204 if (!vp || TAILQ_EMPTY(&vp->val)) {
205 jail_warnx(j,
206 "%s: variable \"%s\" not found",
207 p->name, v->name);
208 bad_var:
209 j->flags |= JF_FAILED;
210 TAILQ_FOREACH(vp, &j->params, tq)
211 if (vp->gen == pgen)
212 vp->flags |= PF_BAD;
213 goto free_var;
214 }
215 if (vp->flags & PF_BAD)
216 goto bad_var;
217 if (vp->gen == pgen) {
218 jail_warnx(j, "%s: variable loop",
219 v->name);
220 goto bad_var;
221 }
222 TAILQ_FOREACH(vs, &vp->val, tq)
223 if (!STAILQ_EMPTY(&vs->vars)) {
224 vp->gen = pgen;
225 TAILQ_REMOVE(&j->params, vp,
226 tq);
227 TAILQ_INSERT_BEFORE(p, vp, tq);
228 p = vp;
229 goto find_vars;
230 }
231 vs = TAILQ_FIRST(&vp->val);
232 if (TAILQ_NEXT(vs, tq) != NULL &&
233 (s->s[0] != '\0' ||
234 STAILQ_NEXT(v, tq))) {
235 jail_warnx(j, "%s: array cannot be "
236 "substituted inline",
237 p->name);
238 goto bad_var;
239 }
240 s->s = erealloc(s->s, s->len + vs->len + 1);
241 memmove(s->s + v->pos + vs->len,
242 s->s + v->pos,
243 s->len - v->pos + 1);
244 memcpy(s->s + v->pos, vs->s, vs->len);
245 vv = v;
246 while ((vv = STAILQ_NEXT(vv, tq)))
247 vv->pos += vs->len;
248 s->len += vs->len;
249 while ((vs = TAILQ_NEXT(vs, tq))) {
250 ns = emalloc(sizeof(struct cfstring));
251 ns->s = estrdup(vs->s);
252 ns->len = vs->len;
253 STAILQ_INIT(&ns->vars);
254 TAILQ_INSERT_AFTER(&p->val, s, ns, tq);
255 s = ns;
256 }
257 free_var:
258 free(v->name);
259 STAILQ_REMOVE_HEAD(&s->vars, tq);
260 free(v);
261 }
262 }
263 }
264
265 /* Free the jail's original parameter list and any variables. */
266 while ((p = TAILQ_FIRST(&opp)))
267 free_param(&opp, p);
268 TAILQ_FOREACH_SAFE(p, &j->params, tq, tp)
269 if (p->flags & PF_VAR)
270 free_param(&j->params, p);
271 }
272 while ((wj = TAILQ_FIRST(&wild))) {
273 free(wj->name);
274 while ((p = TAILQ_FIRST(&wj->params)))
275 free_param(&wj->params, p);
276 TAILQ_REMOVE(&wild, wj, tq);
277 }
278 }
279
280 void
include_config(void * scanner,const char * cfname)281 include_config(void *scanner, const char *cfname)
282 {
283 static unsigned int depth;
284 glob_t g = {0};
285 const char *slash;
286 char *fullpath = NULL;
287
288 /* Simple sanity check for include loops. */
289 if (++depth > MAX_INCLUDE_DEPTH)
290 errx(1, "maximum include depth exceeded");
291 /* Base relative pathnames on the current config file. */
292 if (yyget_in(scanner) != stdin && cfname[0] != '/') {
293 const char *outer_cfname = yyget_extra(scanner)->cfname;
294 if ((slash = strrchr(outer_cfname, '/')) != NULL) {
295 size_t dirlen = (slash - outer_cfname) + 1;
296
297 fullpath = emalloc(dirlen + strlen(cfname) + 1);
298 strncpy(fullpath, outer_cfname, dirlen);
299 strcpy(fullpath + dirlen, cfname);
300 cfname = fullpath;
301 }
302 }
303 /*
304 * Check if the include statement had a filename glob.
305 * Globbing doesn't need to catch any files, but a non-glob
306 * file needs to exist (enforced by parse_config).
307 */
308 if (glob(cfname, GLOB_NOCHECK, NULL, &g) != 0)
309 errx(1, "%s: filename glob failed", cfname);
310 if (g.gl_flags & GLOB_MAGCHAR) {
311 for (size_t gi = 0; gi < g.gl_matchc; gi++)
312 parse_config(g.gl_pathv[gi], 0);
313 } else
314 parse_config(cfname, 0);
315 if (fullpath)
316 free(fullpath);
317 --depth;
318 }
319
320 static void
parse_config(const char * cfname,int is_stdin)321 parse_config(const char *cfname, int is_stdin)
322 {
323 struct cflex cflex = {.cfname = cfname, .error = 0};
324 void *scanner;
325
326 yylex_init_extra(&cflex, &scanner);
327 if (is_stdin) {
328 cflex.cfname = "STDIN";
329 yyset_in(stdin, scanner);
330 } else {
331 FILE *yfp = fopen(cfname, "r");
332 if (!yfp)
333 err(1, "%s", cfname);
334 yyset_in(yfp, scanner);
335 }
336 if (yyparse(scanner) || cflex.error)
337 exit(1);
338 yylex_destroy(scanner);
339 }
340
341 /*
342 * Create a new jail record.
343 */
344 struct cfjail *
add_jail(void)345 add_jail(void)
346 {
347 struct cfjail *j;
348
349 j = emalloc(sizeof(struct cfjail));
350 memset(j, 0, sizeof(struct cfjail));
351 TAILQ_INIT(&j->params);
352 STAILQ_INIT(&j->dep[DEP_FROM]);
353 STAILQ_INIT(&j->dep[DEP_TO]);
354 j->queue = &cfjails;
355 TAILQ_INSERT_TAIL(&cfjails, j, tq);
356 return j;
357 }
358
359 /*
360 * Add a parameter to a jail.
361 */
362 void
add_param(struct cfjail * j,const struct cfparam * p,enum intparam ipnum,const char * value)363 add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
364 const char *value)
365 {
366 struct cfstrings nss;
367 struct cfparam *dp, *np;
368 struct cfstring *s, *ns;
369 struct cfvar *v, *nv;
370 const char *name;
371 char *cs, *tname;
372 unsigned flags;
373
374 if (j == NULL) {
375 /* Create a single anonymous jail if one doesn't yet exist. */
376 j = TAILQ_LAST(&cfjails, cfjails);
377 if (j == NULL)
378 j = add_jail();
379 }
380 TAILQ_INIT(&nss);
381 if (p != NULL) {
382 name = p->name;
383 flags = p->flags;
384 /*
385 * Make a copy of the parameter's string list,
386 * which may be freed if it's overridden later.
387 */
388 TAILQ_FOREACH(s, &p->val, tq) {
389 ns = emalloc(sizeof(struct cfstring));
390 ns->s = estrdup(s->s);
391 ns->len = s->len;
392 STAILQ_INIT(&ns->vars);
393 STAILQ_FOREACH(v, &s->vars, tq) {
394 nv = emalloc(sizeof(struct cfvar));
395 nv->name = strdup(v->name);
396 nv->pos = v->pos;
397 STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
398 }
399 TAILQ_INSERT_TAIL(&nss, ns, tq);
400 }
401 } else {
402 flags = PF_APPEND;
403 if (ipnum != IP__NULL) {
404 name = intparams[ipnum].name;
405 flags |= intparams[ipnum].flags;
406 } else if ((cs = strchr(value, '='))) {
407 tname = alloca(cs - value + 1);
408 strlcpy(tname, value, cs - value + 1);
409 name = tname;
410 value = cs + 1;
411 } else {
412 name = value;
413 value = NULL;
414 }
415 if (value != NULL) {
416 ns = emalloc(sizeof(struct cfstring));
417 ns->s = estrdup(value);
418 ns->len = strlen(value);
419 STAILQ_INIT(&ns->vars);
420 TAILQ_INSERT_TAIL(&nss, ns, tq);
421 }
422 }
423
424 /* See if this parameter has already been added. */
425 if (ipnum != IP__NULL)
426 dp = j->intparams[ipnum];
427 else
428 TAILQ_FOREACH(dp, &j->params, tq)
429 if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
430 break;
431 if (dp != NULL) {
432 /* Found it - append or replace. */
433 if ((flags ^ dp->flags) & PF_VAR) {
434 jail_warnx(j, "variable \"$%s\" cannot have the same "
435 "name as a parameter.", name);
436 j->flags |= JF_FAILED;
437 return;
438 }
439 if (dp->flags & PF_IMMUTABLE) {
440 jail_warnx(j, "cannot redefine parameter \"%s\".",
441 dp->name);
442 j->flags |= JF_FAILED;
443 return;
444 }
445 if (strcmp(dp->name, name)) {
446 free(dp->name);
447 dp->name = estrdup(name);
448 }
449 if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
450 free_param_strings(dp);
451 TAILQ_CONCAT(&dp->val, &nss, tq);
452 dp->flags |= flags;
453 } else {
454 /* Not found - add it. */
455 np = emalloc(sizeof(struct cfparam));
456 np->name = estrdup(name);
457 TAILQ_INIT(&np->val);
458 TAILQ_CONCAT(&np->val, &nss, tq);
459 np->flags = flags;
460 np->gen = 0;
461 TAILQ_INSERT_TAIL(&j->params, np, tq);
462 if (ipnum != IP__NULL)
463 j->intparams[ipnum] = np;
464 else
465 for (ipnum = IP__NULL + 1; ipnum < IP_NPARAM; ipnum++)
466 if (!(intparams[ipnum].flags & PF_CONV) &&
467 equalopts(name, intparams[ipnum].name)) {
468 if (flags & PF_VAR) {
469 jail_warnx(j,
470 "variable \"$%s\" "
471 "cannot have the same "
472 "name as a parameter.",
473 name);
474 j->flags |= JF_FAILED;
475 return;
476 }
477 j->intparams[ipnum] = np;
478 np->flags |= intparams[ipnum].flags;
479 break;
480 }
481 }
482 }
483
484 /*
485 * Return if a boolean parameter exists and is true.
486 */
487 int
bool_param(const struct cfparam * p)488 bool_param(const struct cfparam *p)
489 {
490 const char *cs;
491
492 if (p == NULL)
493 return 0;
494 cs = strrchr(p->name, '.');
495 return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
496 (TAILQ_EMPTY(&p->val) ||
497 !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
498 (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
499 }
500
501 /*
502 * Set an integer if a parameter if it exists.
503 */
504 int
int_param(const struct cfparam * p,int * ip)505 int_param(const struct cfparam *p, int *ip)
506 {
507 if (p == NULL || TAILQ_EMPTY(&p->val))
508 return 0;
509 *ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
510 return 1;
511 }
512
513 /*
514 * Return the string value of a scalar parameter if it exists.
515 */
516 const char *
string_param(const struct cfparam * p)517 string_param(const struct cfparam *p)
518 {
519 return (p && !TAILQ_EMPTY(&p->val)
520 ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
521 }
522
523 /*
524 * Check syntax and values of internal parameters. Set some internal
525 * parameters based on the values of others.
526 */
527 int
check_intparams(struct cfjail * j)528 check_intparams(struct cfjail *j)
529 {
530 struct cfparam *p;
531 struct cfstring *s;
532 FILE *f;
533 const char *val;
534 char *cs, *ep, *ln;
535 size_t lnlen;
536 int error;
537 #if defined(INET) || defined(INET6)
538 struct addrinfo hints;
539 struct addrinfo *ai0, *ai;
540 const char *hostname;
541 int gicode, defif;
542 #endif
543 #ifdef INET
544 struct in_addr addr4;
545 int ip4ok;
546 char avalue4[INET_ADDRSTRLEN];
547 #endif
548 #ifdef INET6
549 struct in6_addr addr6;
550 int ip6ok;
551 char avalue6[INET6_ADDRSTRLEN];
552 #endif
553
554 error = 0;
555 /* Check format of boolan and integer values. */
556 TAILQ_FOREACH(p, &j->params, tq) {
557 if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
558 val = TAILQ_LAST(&p->val, cfstrings)->s;
559 if (p->flags & PF_BOOL) {
560 if (strcasecmp(val, "false") &&
561 strcasecmp(val, "true") &&
562 ((void)strtol(val, &ep, 10), *ep)) {
563 jail_warnx(j,
564 "%s: unknown boolean value \"%s\"",
565 p->name, val);
566 error = -1;
567 }
568 } else {
569 (void)strtol(val, &ep, 10);
570 if (ep == val || *ep) {
571 jail_warnx(j,
572 "%s: non-integer value \"%s\"",
573 p->name, val);
574 error = -1;
575 }
576 }
577 }
578 }
579
580 #if defined(INET) || defined(INET6)
581 /*
582 * The ip_hostname parameter looks up the hostname, and adds parameters
583 * for any IP addresses it finds.
584 */
585 if (((j->flags & JF_OP_MASK) != JF_STOP ||
586 j->intparams[IP_INTERFACE] != NULL) &&
587 bool_param(j->intparams[IP_IP_HOSTNAME]) &&
588 (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
589 j->intparams[IP_IP_HOSTNAME] = NULL;
590 /*
591 * Silently ignore unsupported address families from
592 * DNS lookups.
593 */
594 #ifdef INET
595 ip4ok = feature_present("inet");
596 #endif
597 #ifdef INET6
598 ip6ok = feature_present("inet6");
599 #endif
600 if (
601 #if defined(INET) && defined(INET6)
602 ip4ok || ip6ok
603 #elif defined(INET)
604 ip4ok
605 #elif defined(INET6)
606 ip6ok
607 #endif
608 ) {
609 /* Look up the hostname (or get the address) */
610 memset(&hints, 0, sizeof(hints));
611 hints.ai_socktype = SOCK_STREAM;
612 hints.ai_family =
613 #if defined(INET) && defined(INET6)
614 ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) : PF_INET6;
615 #elif defined(INET)
616 PF_INET;
617 #elif defined(INET6)
618 PF_INET6;
619 #endif
620 gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
621 if (gicode != 0) {
622 jail_warnx(j, "host.hostname %s: %s", hostname,
623 gai_strerror(gicode));
624 error = -1;
625 } else {
626 /*
627 * Convert the addresses to ASCII so jailparam
628 * can convert them back. Errors are not
629 * expected here.
630 */
631 for (ai = ai0; ai; ai = ai->ai_next)
632 switch (ai->ai_family) {
633 #ifdef INET
634 case AF_INET:
635 memcpy(&addr4,
636 &((struct sockaddr_in *)
637 (void *)ai->ai_addr)->
638 sin_addr, sizeof(addr4));
639 if (inet_ntop(AF_INET,
640 &addr4, avalue4,
641 INET_ADDRSTRLEN) == NULL)
642 err(1, "inet_ntop");
643 add_param(j, NULL, KP_IP4_ADDR,
644 avalue4);
645 break;
646 #endif
647 #ifdef INET6
648 case AF_INET6:
649 memcpy(&addr6,
650 &((struct sockaddr_in6 *)
651 (void *)ai->ai_addr)->
652 sin6_addr, sizeof(addr6));
653 if (inet_ntop(AF_INET6,
654 &addr6, avalue6,
655 INET6_ADDRSTRLEN) == NULL)
656 err(1, "inet_ntop");
657 add_param(j, NULL, KP_IP6_ADDR,
658 avalue6);
659 break;
660 #endif
661 }
662 freeaddrinfo(ai0);
663 }
664 }
665 }
666
667 /*
668 * IP addresses may include an interface to set that address on,
669 * a netmask/suffix for that address and options for ifconfig.
670 * These are copied to an internal command parameter and then stripped
671 * so they won't be passed on to jailparam_set.
672 */
673 defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
674 #ifdef INET
675 if (j->intparams[KP_IP4_ADDR] != NULL) {
676 TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
677 cs = strchr(s->s, '|');
678 if (cs || defif)
679 add_param(j, NULL, IP__IP4_IFADDR, s->s);
680 if (cs) {
681 s->len -= cs + 1 - s->s;
682 memmove(s->s, cs + 1, s->len + 1);
683 }
684 if ((cs = strchr(s->s, '/')) != NULL) {
685 *cs = '\0';
686 s->len = cs - s->s;
687 }
688 if ((cs = strchr(s->s, ' ')) != NULL) {
689 *cs = '\0';
690 s->len = cs - s->s;
691 }
692 }
693 }
694 #endif
695 #ifdef INET6
696 if (j->intparams[KP_IP6_ADDR] != NULL) {
697 TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
698 cs = strchr(s->s, '|');
699 if (cs || defif)
700 add_param(j, NULL, IP__IP6_IFADDR, s->s);
701 if (cs) {
702 s->len -= cs + 1 - s->s;
703 memmove(s->s, cs + 1, s->len + 1);
704 }
705 if ((cs = strchr(s->s, '/')) != NULL) {
706 *cs = '\0';
707 s->len = cs - s->s;
708 }
709 if ((cs = strchr(s->s, ' ')) != NULL) {
710 *cs = '\0';
711 s->len = cs - s->s;
712 }
713 }
714 }
715 #endif
716 #endif
717
718 /*
719 * Read mount.fstab file(s), and treat each line as its own mount
720 * parameter.
721 */
722 if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
723 TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
724 if (s->len == 0)
725 continue;
726 f = fopen(s->s, "r");
727 if (f == NULL) {
728 jail_warnx(j, "mount.fstab: %s: %s",
729 s->s, strerror(errno));
730 error = -1;
731 continue;
732 }
733 while ((ln = fgetln(f, &lnlen))) {
734 if ((cs = memchr(ln, '#', lnlen - 1)))
735 lnlen = cs - ln + 1;
736 if (ln[lnlen - 1] == '\n' ||
737 ln[lnlen - 1] == '#')
738 ln[lnlen - 1] = '\0';
739 else {
740 cs = alloca(lnlen + 1);
741 strlcpy(cs, ln, lnlen + 1);
742 ln = cs;
743 }
744 add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
745 }
746 fclose(f);
747 }
748 }
749 if (error)
750 failed(j);
751 return error;
752 }
753
754 /*
755 * Import parameters into libjail's binary jailparam format.
756 */
757 int
import_params(struct cfjail * j)758 import_params(struct cfjail *j)
759 {
760 struct cfparam *p;
761 struct cfstring *s, *ts;
762 struct jailparam *jp;
763 char *value, *cs;
764 size_t vallen;
765 int error;
766
767 error = 0;
768 j->njp = 0;
769 TAILQ_FOREACH(p, &j->params, tq)
770 if (!(p->flags & PF_INTERNAL))
771 j->njp++;
772 j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
773 TAILQ_FOREACH(p, &j->params, tq) {
774 if (p->flags & PF_INTERNAL)
775 continue;
776 if (jailparam_init(jp, p->name) < 0) {
777 error = -1;
778 jail_warnx(j, "%s", jail_errmsg);
779 jp++;
780 continue;
781 }
782 if (TAILQ_EMPTY(&p->val))
783 value = NULL;
784 else if (!jp->jp_elemlen ||
785 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
786 /*
787 * Scalar parameters silently discard multiple (array)
788 * values, keeping only the last value added. This
789 * lets values added from the command line append to
790 * arrays wthout pre-checking the type.
791 */
792 value = TAILQ_LAST(&p->val, cfstrings)->s;
793 } else {
794 /*
795 * Convert arrays into comma-separated strings, which
796 * jailparam_import will then convert back into arrays.
797 */
798 vallen = 0;
799 TAILQ_FOREACH(s, &p->val, tq)
800 vallen += s->len + 1;
801 value = alloca(vallen);
802 cs = value;
803 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
804 memcpy(cs, s->s, s->len);
805 cs += s->len + 1;
806 cs[-1] = ',';
807 }
808 value[vallen - 1] = '\0';
809 }
810 if (jailparam_import(jp, value) < 0) {
811 error = -1;
812 jail_warnx(j, "%s", jail_errmsg);
813 }
814 jp++;
815 }
816 if (error) {
817 jailparam_free(j->jp, j->njp);
818 free(j->jp);
819 j->jp = NULL;
820 failed(j);
821 }
822 return error;
823 }
824
825 /*
826 * Check if options are equal (with or without the "no" prefix).
827 */
828 int
equalopts(const char * opt1,const char * opt2)829 equalopts(const char *opt1, const char *opt2)
830 {
831 char *p;
832
833 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
834 if (strcmp(opt1, opt2) == 0)
835 return (1);
836 /* "noopt" vs. "opt" */
837 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
838 return (1);
839 /* "opt" vs. "noopt" */
840 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
841 return (1);
842 while ((p = strchr(opt1, '.')) != NULL &&
843 !strncmp(opt1, opt2, ++p - opt1)) {
844 opt2 += p - opt1;
845 opt1 = p;
846 /* "foo.noopt" vs. "foo.opt" */
847 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
848 return (1);
849 /* "foo.opt" vs. "foo.noopt" */
850 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
851 return (1);
852 }
853 return (0);
854 }
855
856 /*
857 * See if a jail name matches a wildcard.
858 */
859 int
wild_jail_match(const char * jname,const char * wname)860 wild_jail_match(const char *jname, const char *wname)
861 {
862 const char *jc, *jd, *wc, *wd;
863
864 /*
865 * A non-final "*" component in the wild name matches a single jail
866 * component, and a final "*" matches one or more jail components.
867 */
868 for (jc = jname, wc = wname;
869 (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
870 jc = jd + 1, wc = wd + 1)
871 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
872 return 0;
873 return (!strcmp(jc, wc) || !strcmp(wc, "*"));
874 }
875
876 /*
877 * Return if a jail name is a wildcard.
878 */
879 int
wild_jail_name(const char * wname)880 wild_jail_name(const char *wname)
881 {
882 const char *wc;
883
884 for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
885 if ((wc == wname || wc[-1] == '.') &&
886 (wc[1] == '\0' || wc[1] == '.'))
887 return 1;
888 return 0;
889 }
890
891 /*
892 * Free a parameter record and all its strings and variables.
893 */
894 static void
free_param(struct cfparams * pp,struct cfparam * p)895 free_param(struct cfparams *pp, struct cfparam *p)
896 {
897 free(p->name);
898 free_param_strings(p);
899 TAILQ_REMOVE(pp, p, tq);
900 free(p);
901 }
902
903 void
free_param_strings(struct cfparam * p)904 free_param_strings(struct cfparam *p)
905 {
906 struct cfstring *s;
907 struct cfvar *v;
908
909 while ((s = TAILQ_FIRST(&p->val))) {
910 free(s->s);
911 while ((v = STAILQ_FIRST(&s->vars))) {
912 free(v->name);
913 STAILQ_REMOVE_HEAD(&s->vars, tq);
914 free(v);
915 }
916 TAILQ_REMOVE(&p->val, s, tq);
917 free(s);
918 }
919 }
920