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, NULL, KP_NAME, j->name);
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 FILE *yfp = NULL;
325 void *scanner;
326
327 yylex_init_extra(&cflex, &scanner);
328 if (is_stdin) {
329 cflex.cfname = "STDIN";
330 yyset_in(stdin, scanner);
331 } else {
332 yfp = fopen(cfname, "re");
333 if (!yfp)
334 err(1, "%s", cfname);
335 yyset_in(yfp, scanner);
336 }
337 if (yyparse(scanner) || cflex.error)
338 exit(1);
339 yylex_destroy(scanner);
340 if (yfp != NULL)
341 fclose(yfp);
342 }
343
344 /*
345 * Create a new jail record.
346 */
347 struct cfjail *
add_jail(void)348 add_jail(void)
349 {
350 struct cfjail *j;
351
352 j = emalloc(sizeof(struct cfjail));
353 memset(j, 0, sizeof(struct cfjail));
354 TAILQ_INIT(&j->params);
355 STAILQ_INIT(&j->dep[DEP_FROM]);
356 STAILQ_INIT(&j->dep[DEP_TO]);
357 j->queue = &cfjails;
358 TAILQ_INSERT_TAIL(&cfjails, j, tq);
359 return j;
360 }
361
362 /*
363 * Add a parameter to a jail.
364 */
365 void
add_param(struct cfjail * j,const struct cfparam * p,enum intparam ipnum,const char * value)366 add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
367 const char *value)
368 {
369 struct cfstrings nss;
370 struct cfparam *dp, *np;
371 struct cfstring *s, *ns;
372 struct cfvar *v, *nv;
373 const char *name;
374 char *cs, *tname;
375 unsigned flags;
376
377 if (j == NULL) {
378 /* Create a single anonymous jail if one doesn't yet exist. */
379 j = TAILQ_LAST(&cfjails, cfjails);
380 if (j == NULL)
381 j = add_jail();
382 }
383 TAILQ_INIT(&nss);
384 if (p != NULL) {
385 name = p->name;
386 flags = p->flags;
387 /*
388 * Make a copy of the parameter's string list,
389 * which may be freed if it's overridden later.
390 */
391 TAILQ_FOREACH(s, &p->val, tq) {
392 ns = emalloc(sizeof(struct cfstring));
393 ns->s = estrdup(s->s);
394 ns->len = s->len;
395 STAILQ_INIT(&ns->vars);
396 STAILQ_FOREACH(v, &s->vars, tq) {
397 nv = emalloc(sizeof(struct cfvar));
398 nv->name = strdup(v->name);
399 nv->pos = v->pos;
400 STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
401 }
402 TAILQ_INSERT_TAIL(&nss, ns, tq);
403 }
404 } else {
405 flags = PF_APPEND;
406 if (ipnum != IP__NULL) {
407 name = intparams[ipnum].name;
408 flags |= intparams[ipnum].flags;
409 } else if ((cs = strchr(value, '='))) {
410 tname = alloca(cs - value + 1);
411 strlcpy(tname, value, cs - value + 1);
412 name = tname;
413 value = cs + 1;
414 } else {
415 name = value;
416 value = NULL;
417 }
418 if (value != NULL) {
419 ns = emalloc(sizeof(struct cfstring));
420 ns->s = estrdup(value);
421 ns->len = strlen(value);
422 STAILQ_INIT(&ns->vars);
423 TAILQ_INSERT_TAIL(&nss, ns, tq);
424 }
425 }
426
427 /* See if this parameter has already been added. */
428 if (ipnum != IP__NULL)
429 dp = j->intparams[ipnum];
430 else
431 TAILQ_FOREACH(dp, &j->params, tq)
432 if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
433 break;
434 if (dp != NULL) {
435 /* Found it - append or replace. */
436 if ((flags ^ dp->flags) & PF_VAR) {
437 jail_warnx(j, "variable \"$%s\" cannot have the same "
438 "name as a parameter.", name);
439 j->flags |= JF_FAILED;
440 return;
441 }
442 if (dp->flags & PF_IMMUTABLE) {
443 jail_warnx(j, "cannot redefine parameter \"%s\".",
444 dp->name);
445 j->flags |= JF_FAILED;
446 return;
447 }
448 if (strcmp(dp->name, name)) {
449 free(dp->name);
450 dp->name = estrdup(name);
451 }
452 if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
453 free_param_strings(dp);
454 TAILQ_CONCAT(&dp->val, &nss, tq);
455 dp->flags |= flags;
456 } else {
457 /* Not found - add it. */
458 np = emalloc(sizeof(struct cfparam));
459 np->name = estrdup(name);
460 TAILQ_INIT(&np->val);
461 TAILQ_CONCAT(&np->val, &nss, tq);
462 np->flags = flags;
463 np->gen = 0;
464 TAILQ_INSERT_TAIL(&j->params, np, tq);
465 if (ipnum != IP__NULL)
466 j->intparams[ipnum] = np;
467 else
468 for (ipnum = IP__NULL + 1; ipnum < IP_NPARAM; ipnum++)
469 if (!(intparams[ipnum].flags & PF_CONV) &&
470 equalopts(name, intparams[ipnum].name)) {
471 if (flags & PF_VAR) {
472 jail_warnx(j,
473 "variable \"$%s\" "
474 "cannot have the same "
475 "name as a parameter.",
476 name);
477 j->flags |= JF_FAILED;
478 return;
479 }
480 j->intparams[ipnum] = np;
481 np->flags |= intparams[ipnum].flags;
482 break;
483 }
484 }
485 }
486
487 /*
488 * Return if a boolean parameter exists and is true.
489 */
490 int
bool_param(const struct cfparam * p)491 bool_param(const struct cfparam *p)
492 {
493 const char *cs;
494
495 if (p == NULL)
496 return 0;
497 cs = strrchr(p->name, '.');
498 return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
499 (TAILQ_EMPTY(&p->val) ||
500 !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
501 (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
502 }
503
504 /*
505 * Set an integer if a parameter if it exists.
506 */
507 int
int_param(const struct cfparam * p,int * ip)508 int_param(const struct cfparam *p, int *ip)
509 {
510 if (p == NULL || TAILQ_EMPTY(&p->val))
511 return 0;
512 *ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
513 return 1;
514 }
515
516 /*
517 * Return the string value of a scalar parameter if it exists.
518 */
519 const char *
string_param(const struct cfparam * p)520 string_param(const struct cfparam *p)
521 {
522 return (p && !TAILQ_EMPTY(&p->val)
523 ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
524 }
525
526 /*
527 * Check syntax and values of internal parameters. Set some internal
528 * parameters based on the values of others.
529 */
530 int
check_intparams(struct cfjail * j)531 check_intparams(struct cfjail *j)
532 {
533 struct cfparam *p;
534 struct cfstring *s;
535 FILE *f;
536 const char *val;
537 char *cs, *ep, *ln;
538 size_t lnlen;
539 int error;
540 #if defined(INET) || defined(INET6)
541 struct addrinfo hints;
542 struct addrinfo *ai0, *ai;
543 const char *hostname;
544 int gicode, defif;
545 #endif
546 #ifdef INET
547 struct in_addr addr4;
548 int ip4ok;
549 char avalue4[INET_ADDRSTRLEN];
550 #endif
551 #ifdef INET6
552 struct in6_addr addr6;
553 int ip6ok;
554 char avalue6[INET6_ADDRSTRLEN];
555 #endif
556
557 error = 0;
558 /* Check format of boolan and integer values. */
559 TAILQ_FOREACH(p, &j->params, tq) {
560 if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
561 val = TAILQ_LAST(&p->val, cfstrings)->s;
562 if (p->flags & PF_BOOL) {
563 if (strcasecmp(val, "false") &&
564 strcasecmp(val, "true") &&
565 ((void)strtol(val, &ep, 10), *ep)) {
566 jail_warnx(j,
567 "%s: unknown boolean value \"%s\"",
568 p->name, val);
569 error = -1;
570 }
571 } else {
572 (void)strtol(val, &ep, 10);
573 if (ep == val || *ep) {
574 jail_warnx(j,
575 "%s: non-integer value \"%s\"",
576 p->name, val);
577 error = -1;
578 }
579 }
580 }
581 }
582
583 #if defined(INET) || defined(INET6)
584 /*
585 * The ip_hostname parameter looks up the hostname, and adds parameters
586 * for any IP addresses it finds.
587 */
588 if (((j->flags & JF_OP_MASK) != JF_STOP ||
589 j->intparams[IP_INTERFACE] != NULL) &&
590 bool_param(j->intparams[IP_IP_HOSTNAME]) &&
591 (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
592 j->intparams[IP_IP_HOSTNAME] = NULL;
593 /*
594 * Silently ignore unsupported address families from
595 * DNS lookups.
596 */
597 #ifdef INET
598 ip4ok = feature_present("inet");
599 #endif
600 #ifdef INET6
601 ip6ok = feature_present("inet6");
602 #endif
603 if (
604 #if defined(INET) && defined(INET6)
605 ip4ok || ip6ok
606 #elif defined(INET)
607 ip4ok
608 #elif defined(INET6)
609 ip6ok
610 #endif
611 ) {
612 /* Look up the hostname (or get the address) */
613 memset(&hints, 0, sizeof(hints));
614 hints.ai_socktype = SOCK_STREAM;
615 hints.ai_family =
616 #if defined(INET) && defined(INET6)
617 ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) : PF_INET6;
618 #elif defined(INET)
619 PF_INET;
620 #elif defined(INET6)
621 PF_INET6;
622 #endif
623 gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
624 if (gicode != 0) {
625 jail_warnx(j, "host.hostname %s: %s", hostname,
626 gai_strerror(gicode));
627 error = -1;
628 } else {
629 /*
630 * Convert the addresses to ASCII so jailparam
631 * can convert them back. Errors are not
632 * expected here.
633 */
634 for (ai = ai0; ai; ai = ai->ai_next)
635 switch (ai->ai_family) {
636 #ifdef INET
637 case AF_INET:
638 memcpy(&addr4,
639 &((struct sockaddr_in *)
640 (void *)ai->ai_addr)->
641 sin_addr, sizeof(addr4));
642 if (inet_ntop(AF_INET,
643 &addr4, avalue4,
644 INET_ADDRSTRLEN) == NULL)
645 err(1, "inet_ntop");
646 add_param(j, NULL, KP_IP4_ADDR,
647 avalue4);
648 break;
649 #endif
650 #ifdef INET6
651 case AF_INET6:
652 memcpy(&addr6,
653 &((struct sockaddr_in6 *)
654 (void *)ai->ai_addr)->
655 sin6_addr, sizeof(addr6));
656 if (inet_ntop(AF_INET6,
657 &addr6, avalue6,
658 INET6_ADDRSTRLEN) == NULL)
659 err(1, "inet_ntop");
660 add_param(j, NULL, KP_IP6_ADDR,
661 avalue6);
662 break;
663 #endif
664 }
665 freeaddrinfo(ai0);
666 }
667 }
668 }
669
670 /*
671 * IP addresses may include an interface to set that address on,
672 * a netmask/suffix for that address and options for ifconfig.
673 * These are copied to an internal command parameter and then stripped
674 * so they won't be passed on to jailparam_set.
675 */
676 defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
677 #ifdef INET
678 if (j->intparams[KP_IP4_ADDR] != NULL) {
679 TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
680 cs = strchr(s->s, '|');
681 if (cs || defif)
682 add_param(j, NULL, IP__IP4_IFADDR, s->s);
683 if (cs) {
684 s->len -= cs + 1 - s->s;
685 memmove(s->s, cs + 1, s->len + 1);
686 }
687 if ((cs = strchr(s->s, '/')) != NULL) {
688 *cs = '\0';
689 s->len = cs - s->s;
690 }
691 if ((cs = strchr(s->s, ' ')) != NULL) {
692 *cs = '\0';
693 s->len = cs - s->s;
694 }
695 }
696 }
697 #endif
698 #ifdef INET6
699 if (j->intparams[KP_IP6_ADDR] != NULL) {
700 TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
701 cs = strchr(s->s, '|');
702 if (cs || defif)
703 add_param(j, NULL, IP__IP6_IFADDR, s->s);
704 if (cs) {
705 s->len -= cs + 1 - s->s;
706 memmove(s->s, cs + 1, s->len + 1);
707 }
708 if ((cs = strchr(s->s, '/')) != NULL) {
709 *cs = '\0';
710 s->len = cs - s->s;
711 }
712 if ((cs = strchr(s->s, ' ')) != NULL) {
713 *cs = '\0';
714 s->len = cs - s->s;
715 }
716 }
717 }
718 #endif
719 #endif
720
721 /*
722 * Read mount.fstab file(s), and treat each line as its own mount
723 * parameter.
724 */
725 if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
726 TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
727 if (s->len == 0)
728 continue;
729 f = fopen(s->s, "re");
730 if (f == NULL) {
731 jail_warnx(j, "mount.fstab: %s: %s",
732 s->s, strerror(errno));
733 error = -1;
734 continue;
735 }
736 while ((ln = fgetln(f, &lnlen))) {
737 if ((cs = memchr(ln, '#', lnlen - 1)))
738 lnlen = cs - ln + 1;
739 if (ln[lnlen - 1] == '\n' ||
740 ln[lnlen - 1] == '#')
741 ln[lnlen - 1] = '\0';
742 else {
743 cs = alloca(lnlen + 1);
744 strlcpy(cs, ln, lnlen + 1);
745 ln = cs;
746 }
747 add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
748 }
749 fclose(f);
750 }
751 }
752 if (error)
753 failed(j);
754 return error;
755 }
756
757 /*
758 * Import parameters into libjail's binary jailparam format.
759 */
760 int
import_params(struct cfjail * j)761 import_params(struct cfjail *j)
762 {
763 struct cfparam *p;
764 struct cfstring *s, *ts;
765 struct jailparam *jp;
766 char *value, *cs;
767 size_t vallen;
768 int error;
769
770 error = 0;
771 j->njp = 0;
772 TAILQ_FOREACH(p, &j->params, tq)
773 if (!(p->flags & PF_INTERNAL))
774 j->njp++;
775 j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
776 TAILQ_FOREACH(p, &j->params, tq) {
777 if (p->flags & PF_INTERNAL)
778 continue;
779 if (jailparam_init(jp, p->name) < 0) {
780 error = -1;
781 jail_warnx(j, "%s", jail_errmsg);
782 jp++;
783 continue;
784 }
785 if (TAILQ_EMPTY(&p->val))
786 value = NULL;
787 else if (!jp->jp_elemlen ||
788 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
789 /*
790 * Scalar parameters silently discard multiple (array)
791 * values, keeping only the last value added. This
792 * lets values added from the command line append to
793 * arrays wthout pre-checking the type.
794 */
795 value = TAILQ_LAST(&p->val, cfstrings)->s;
796 } else {
797 /*
798 * Convert arrays into comma-separated strings, which
799 * jailparam_import will then convert back into arrays.
800 */
801 vallen = 0;
802 TAILQ_FOREACH(s, &p->val, tq)
803 vallen += s->len + 1;
804 value = alloca(vallen);
805 cs = value;
806 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
807 memcpy(cs, s->s, s->len);
808 cs += s->len + 1;
809 cs[-1] = ',';
810 }
811 value[vallen - 1] = '\0';
812 }
813 if (jailparam_import(jp, value) < 0) {
814 error = -1;
815 jail_warnx(j, "%s", jail_errmsg);
816 }
817 jp++;
818 }
819 if (error) {
820 jailparam_free(j->jp, j->njp);
821 free(j->jp);
822 j->jp = NULL;
823 failed(j);
824 }
825 return error;
826 }
827
828 /*
829 * Check if options are equal (with or without the "no" prefix).
830 */
831 int
equalopts(const char * opt1,const char * opt2)832 equalopts(const char *opt1, const char *opt2)
833 {
834 char *p;
835
836 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
837 if (strcmp(opt1, opt2) == 0)
838 return (1);
839 /* "noopt" vs. "opt" */
840 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
841 return (1);
842 /* "opt" vs. "noopt" */
843 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
844 return (1);
845 while ((p = strchr(opt1, '.')) != NULL &&
846 !strncmp(opt1, opt2, ++p - opt1)) {
847 opt2 += p - opt1;
848 opt1 = p;
849 /* "foo.noopt" vs. "foo.opt" */
850 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
851 return (1);
852 /* "foo.opt" vs. "foo.noopt" */
853 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
854 return (1);
855 }
856 return (0);
857 }
858
859 /*
860 * See if a jail name matches a wildcard.
861 */
862 int
wild_jail_match(const char * jname,const char * wname)863 wild_jail_match(const char *jname, const char *wname)
864 {
865 const char *jc, *jd, *wc, *wd;
866
867 /*
868 * A non-final "*" component in the wild name matches a single jail
869 * component, and a final "*" matches one or more jail components.
870 */
871 for (jc = jname, wc = wname;
872 (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
873 jc = jd + 1, wc = wd + 1)
874 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
875 return 0;
876 return (!strcmp(jc, wc) || !strcmp(wc, "*"));
877 }
878
879 /*
880 * Return if a jail name is a wildcard.
881 */
882 int
wild_jail_name(const char * wname)883 wild_jail_name(const char *wname)
884 {
885 const char *wc;
886
887 for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
888 if ((wc == wname || wc[-1] == '.') &&
889 (wc[1] == '\0' || wc[1] == '.'))
890 return 1;
891 return 0;
892 }
893
894 /*
895 * Free a parameter record and all its strings and variables.
896 */
897 static void
free_param(struct cfparams * pp,struct cfparam * p)898 free_param(struct cfparams *pp, struct cfparam *p)
899 {
900 free(p->name);
901 free_param_strings(p);
902 TAILQ_REMOVE(pp, p, tq);
903 free(p);
904 }
905
906 void
free_param_strings(struct cfparam * p)907 free_param_strings(struct cfparam *p)
908 {
909 struct cfstring *s;
910 struct cfvar *v;
911
912 while ((s = TAILQ_FIRST(&p->val))) {
913 free(s->s);
914 while ((v = STAILQ_FIRST(&s->vars))) {
915 free(v->name);
916 STAILQ_REMOVE_HEAD(&s->vars, tq);
917 free(v);
918 }
919 TAILQ_REMOVE(&p->val, s, tq);
920 free(s);
921 }
922 }
923