config.c revision 223351 
1/*-
2 * Copyright (c) 2011 James Gritton
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: projects/jailconf/usr.sbin/jail/config.c 223351 2011-06-20 23:04:13Z jamie $");
29
30#include <sys/types.h>
31#include <sys/errno.h>
32#include <sys/socket.h>
33#include <sys/sysctl.h>
34
35#include <arpa/inet.h>
36#include <netinet/in.h>
37
38#include <err.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
47struct ipspec {
48	const char	*name;
49	unsigned	flags;
50};
51
52extern FILE *yyin;
53extern int yynerrs;
54
55struct cfjails cfjails = TAILQ_HEAD_INITIALIZER(cfjails);
56
57static void free_param(struct cfparams *pp, struct cfparam *p);
58static void free_param_strings(struct cfparam *p);
59
60static const struct ipspec intparams[] = {
61    [IP_ALLOW_DYING] =		{"allow.dying",		PF_INTERNAL | PF_BOOL},
62    [IP_COMMAND] =		{"command",		PF_INTERNAL},
63    [IP_DEPEND] =		{"depend",		PF_INTERNAL},
64    [IP_EXEC_CLEAN] =		{"exec.clean",		PF_INTERNAL | PF_BOOL},
65    [IP_EXEC_CONSOLELOG] =	{"exec.consolelog",	PF_INTERNAL},
66    [IP_EXEC_FIB] =		{"exec.fib",		PF_INTERNAL | PF_INT},
67    [IP_EXEC_JAIL_USER] =	{"exec.jail_user",	PF_INTERNAL},
68    [IP_EXEC_POSTSTART] =	{"exec.poststart",	PF_INTERNAL},
69    [IP_EXEC_POSTSTOP] =	{"exec.poststop",	PF_INTERNAL},
70    [IP_EXEC_PRESTART] =	{"exec.prestart",	PF_INTERNAL},
71    [IP_EXEC_PRESTOP] =		{"exec.prestop",	PF_INTERNAL},
72    [IP_EXEC_START] =		{"exec.start",		PF_INTERNAL},
73    [IP_EXEC_STOP] =		{"exec.stop",		PF_INTERNAL},
74    [IP_EXEC_SYSTEM_JAIL_USER]=	{"exec.system_jail_user",
75							PF_INTERNAL | PF_BOOL},
76    [IP_EXEC_SYSTEM_USER] =	{"exec.system_user",	PF_INTERNAL},
77    [IP_EXEC_TIMEOUT] =		{"exec.timeout",	PF_INTERNAL | PF_INT},
78#if defined(INET) || defined(INET6)
79    [IP_INTERFACE] =		{"interface",		PF_INTERNAL},
80    [IP_IP_HOSTNAME] =		{"ip_hostname",		PF_INTERNAL | PF_BOOL},
81#endif
82    [IP_MOUNT] =		{"mount",		PF_INTERNAL},
83    [IP_MOUNT_DEVFS] =		{"mount.devfs",		PF_INTERNAL | PF_BOOL},
84    [IP_MOUNT_DEVFS_RULESET]=	{"mount.devfs.ruleset",	PF_INTERNAL},
85    [IP_MOUNT_FSTAB] =		{"mount.fstab",		PF_INTERNAL},
86    [IP_STOP_TIMEOUT] =		{"stop.timeout",	PF_INTERNAL | PF_INT},
87    [IP_VNET_INTERFACE] =	{"vnet.interface",	PF_INTERNAL},
88#ifdef INET
89    [IP__IP4_IFADDR] =		{"ip4.addr",		PF_INTERNAL | PF_CONV},
90#endif
91#ifdef INET6
92    [IP__IP6_IFADDR] =		{"ip6.addr",		PF_INTERNAL | PF_CONV},
93#endif
94    [IP__MOUNT_FROM_FSTAB] =	{"mount.fstab",		PF_INTERNAL | PF_CONV},
95    [IP__OP] =			{NULL,			PF_CONV},
96    [KP_ALLOW_CHFLAGS] =	{"allow.chflags",	0},
97    [KP_ALLOW_MOUNT] =		{"allow.mount",		0},
98    [KP_ALLOW_RAW_SOCKETS] =	{"allow.raw_sockets",	0},
99    [KP_ALLOW_SET_HOSTNAME]=	{"allow.set_hostname",	0},
100    [KP_ALLOW_SOCKET_AF] =	{"allow.socket_af",	0},
101    [KP_ALLOW_SYSVIPC] =	{"allow.sysvipc",	0},
102    [KP_ENFORCE_STATFS] =	{"enforce_statfs",	0},
103    [KP_HOST_HOSTNAME] =	{"host.hostname",	0},
104#ifdef INET
105    [KP_IP4_ADDR] =		{"ip4.addr",		0},
106#endif
107#ifdef INET6
108    [KP_IP6_ADDR] =		{"ip6.addr",		0},
109#endif
110    [KP_JID] =			{"jid",			0},
111    [KP_NAME] =			{"name",		0},
112    [KP_PATH] =			{"path",		0},
113    [KP_PERSIST] =		{"persist",		0},
114    [KP_SECURELEVEL] =		{"securelevel",		0},
115    [KP_VNET] =			{"vnet",		0},
116};
117
118/*
119 * Parse the jail configuration file.
120 */
121void
122load_config(void)
123{
124	struct cfjails wild;
125	struct cfparams opp;
126	struct cfjail *j, *tj, *wj;
127	struct cfparam *p, *vp, *tp;
128	struct cfstring *s, *vs, *ns;
129	struct cfvar *v;
130	char *ep;
131	size_t varoff;
132	int did_self, jseq, pgen;
133
134	if (!strcmp(cfname, "-")) {
135		cfname = "STDIN";
136		yyin = stdin;
137	} else {
138		yyin = fopen(cfname, "r");
139		if (!yyin)
140			err(1, "%s", cfname);
141	}
142	if (yyparse() || yynerrs)
143		exit(1);
144
145	/* Separate the wildcard jails out from the actual jails. */
146	jseq = 0;
147	TAILQ_INIT(&wild);
148	TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
149		j->seq = ++jseq;
150		if (wild_jail_name(j->name))
151			requeue(j, &wild);
152	}
153
154	TAILQ_FOREACH(j, &cfjails, tq) {
155		/* Set aside the jail's parameters. */
156		TAILQ_INIT(&opp);
157		TAILQ_CONCAT(&opp, &j->params, tq);
158		/*
159		 * The jail name implies its "name" or "jid" parameter,
160		 * though they may also be explicitly set later on.
161		 */
162		add_param(j, NULL,
163		    strtol(j->name, &ep, 10) && !*ep ? KP_JID : KP_NAME,
164		    j->name);
165		/*
166		 * Collect parameters for the jail, global parameters/variables,
167		 * and any matching wildcard jails.
168		 */
169		did_self = 0;
170		TAILQ_FOREACH(wj, &wild, tq) {
171			if (j->seq < wj->seq && !did_self) {
172				TAILQ_FOREACH(p, &opp, tq)
173					add_param(j, p, 0, NULL);
174				did_self = 1;
175			}
176			if (wild_jail_match(j->name, wj->name))
177				TAILQ_FOREACH(p, &wj->params, tq)
178					add_param(j, p, 0, NULL);
179		}
180		if (!did_self)
181			TAILQ_FOREACH(p, &opp, tq)
182				add_param(j, p, 0, NULL);
183
184		/* Resolve any variable substitutions. */
185		pgen = 0;
186		TAILQ_FOREACH(p, &j->params, tq) {
187		    p->gen = ++pgen;
188		find_vars:
189		    TAILQ_FOREACH(s, &p->val, tq) {
190			varoff = 0;
191			while ((v = STAILQ_FIRST(&s->vars))) {
192				TAILQ_FOREACH(vp, &j->params, tq)
193					if (!strcmp(vp->name, v->name))
194						break;
195				if (!vp) {
196					jail_warnx(j,
197					    "%s: variable \"%s\" not found",
198					    p->name, v->name);
199				bad_var:
200					j->flags |= JF_FAILED;
201					TAILQ_FOREACH(vp, &j->params, tq)
202						if (vp->gen == pgen)
203							vp->flags |= PF_BAD;
204					goto free_var;
205				}
206				if (vp->flags & PF_BAD)
207					goto bad_var;
208				if (vp->gen == pgen) {
209					jail_warnx(j, "%s: variable loop",
210					    v->name);
211					goto bad_var;
212				}
213				TAILQ_FOREACH(vs, &vp->val, tq)
214					if (!STAILQ_EMPTY(&vs->vars)) {
215						vp->gen = pgen;
216						TAILQ_REMOVE(&j->params, vp,
217						    tq);
218						TAILQ_INSERT_BEFORE(p, vp, tq);
219						p = vp;
220						goto find_vars;
221					}
222				vs = TAILQ_FIRST(&vp->val);
223				if (TAILQ_NEXT(vs, tq) != NULL &&
224				    (s->s[0] != '\0' ||
225				     STAILQ_NEXT(v, tq))) {
226					jail_warnx(j, "%s: array cannot be "
227					    "substituted inline",
228					    p->name);
229					goto bad_var;
230				}
231				s->s = erealloc(s->s, s->len + vs->len + 1);
232				memmove(s->s + v->pos + varoff + vs->len,
233				    s->s + v->pos + varoff,
234				    s->len - (v->pos + varoff) + 1);
235				memcpy(s->s + v->pos + varoff, vs->s, vs->len);
236				varoff += 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/*
270 * Create a new jail record.
271 */
272struct cfjail *
273add_jail(void)
274{
275	struct cfjail *j;
276
277	j = emalloc(sizeof(struct cfjail));
278	memset(j, 0, sizeof(struct cfjail));
279	TAILQ_INIT(&j->params);
280	STAILQ_INIT(&j->dep[DEP_FROM]);
281	STAILQ_INIT(&j->dep[DEP_TO]);
282	j->queue = &cfjails;
283	TAILQ_INSERT_TAIL(&cfjails, j, tq);
284	return j;
285}
286
287/*
288 * Add a parameter to a jail.
289 */
290void
291add_param(struct cfjail *j, const struct cfparam *p, enum intparam ipnum,
292    const char *value)
293{
294	struct cfstrings nss;
295	struct cfparam *dp, *np;
296	struct cfstring *s, *ns;
297	struct cfvar *v, *nv;
298	const char *name;
299	char *cs, *tname;
300	unsigned flags;
301
302	if (j == NULL) {
303		/* Create a single anonymous jail if one doesn't yet exist. */
304		j = TAILQ_LAST(&cfjails, cfjails);
305		if (j == NULL)
306			j = add_jail();
307	}
308	TAILQ_INIT(&nss);
309	if (p != NULL) {
310		name = p->name;
311		flags = p->flags;
312		/*
313		 * Make a copy of the parameter's string list,
314		 * which may be freed if it's overridden later.
315		 */
316		TAILQ_FOREACH(s, &p->val, tq) {
317			ns = emalloc(sizeof(struct cfstring));
318			ns->s = estrdup(s->s);
319			ns->len = s->len;
320			STAILQ_INIT(&ns->vars);
321			STAILQ_FOREACH(v, &s->vars, tq) {
322				nv = emalloc(sizeof(struct cfvar));
323				nv->name = strdup(v->name);
324				nv->pos = v->pos;
325				STAILQ_INSERT_TAIL(&ns->vars, nv, tq);
326			}
327			TAILQ_INSERT_TAIL(&nss, ns, tq);
328		}
329	} else {
330		flags = PF_APPEND;
331		if (ipnum != 0) {
332			name = intparams[ipnum].name;
333			flags |= intparams[ipnum].flags;
334		} else if ((cs = strchr(value, '='))) {
335			tname = alloca(cs - value + 1);
336			strlcpy(tname, value, cs - value + 1);
337			name = tname;
338			value = cs + 1;
339		} else {
340			name = value;
341			value = NULL;
342		}
343		if (value != NULL) {
344			ns = emalloc(sizeof(struct cfstring));
345			ns->s = estrdup(value);
346			ns->len = strlen(value);
347			STAILQ_INIT(&ns->vars);
348			TAILQ_INSERT_TAIL(&nss, ns, tq);
349		}
350	}
351
352	/* See if this parameter has already been added. */
353	if (ipnum != 0)
354		dp = j->intparams[ipnum];
355	else
356		TAILQ_FOREACH(dp, &j->params, tq)
357			if (!(dp->flags & PF_CONV) && equalopts(dp->name, name))
358				break;
359	if (dp != NULL) {
360		/* Found it - append or replace. */
361		if (strcmp(dp->name, name)) {
362			free(dp->name);
363			dp->name = estrdup(name);
364		}
365		if (!(flags & PF_APPEND) || TAILQ_EMPTY(&nss))
366			free_param_strings(dp);
367		TAILQ_CONCAT(&dp->val, &nss, tq);
368		dp->flags |= flags;
369	} else {
370		/* Not found - add it. */
371		np = emalloc(sizeof(struct cfparam));
372		np->name = estrdup(name);
373		TAILQ_INIT(&np->val);
374		TAILQ_CONCAT(&np->val, &nss, tq);
375		np->flags = flags;
376		np->gen = 0;
377		TAILQ_INSERT_TAIL(&j->params, np, tq);
378		if (ipnum != 0)
379			j->intparams[ipnum] = np;
380		else
381			for (ipnum = 1; ipnum < IP_NPARAM; ipnum++)
382				if (!(intparams[ipnum].flags & PF_CONV) &&
383				    equalopts(name, intparams[ipnum].name)) {
384					j->intparams[ipnum] = np;
385					np->flags |= intparams[ipnum].flags;
386					break;
387				}
388	}
389}
390
391/*
392 * Return if a boolean parameter exists and is true.
393 */
394int
395bool_param(const struct cfparam *p)
396{
397	const char *cs;
398
399	if (p == NULL)
400		return 0;
401	cs = strrchr(p->name, '.');
402	return !strncmp(cs ? cs + 1 : p->name, "no", 2) ^
403	    (TAILQ_EMPTY(&p->val) ||
404	     !strcasecmp(TAILQ_LAST(&p->val, cfstrings)->s, "true") ||
405	     (strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10)));
406}
407
408/*
409 * Set an integer if a parameter if it exists.
410 */
411int
412int_param(const struct cfparam *p, int *ip)
413{
414	if (p == NULL || TAILQ_EMPTY(&p->val))
415		return 0;
416	*ip = strtol(TAILQ_LAST(&p->val, cfstrings)->s, NULL, 10);
417	return 1;
418}
419
420/*
421 * Return the string value of a scalar parameter if it exists.
422 */
423const char *
424string_param(const struct cfparam *p)
425{
426	return (p && !TAILQ_EMPTY(&p->val)
427	    ? TAILQ_LAST(&p->val, cfstrings)->s : NULL);
428}
429
430/*
431 * Check syntax and values of internal parameters.  Set some internal
432 * parameters based on the values of others.
433 */
434int
435check_intparams(struct cfjail *j)
436{
437	struct cfparam *p;
438	struct cfstring *s;
439	FILE *f;
440	const char *val;
441	char *cs, *ep, *ln;
442	size_t lnlen;
443	int error;
444#if defined(INET) || defined(INET6)
445	struct addrinfo hints;
446	struct addrinfo *ai0, *ai;
447	const char *hostname;
448	int gicode, defif, prefix;
449#endif
450#ifdef INET
451	struct in_addr addr4;
452	int ip4ok;
453	char avalue4[INET_ADDRSTRLEN];
454#endif
455#ifdef INET6
456	struct in6_addr addr6;
457	int ip6ok;
458	char avalue6[INET6_ADDRSTRLEN];
459#endif
460
461	error = 0;
462	/* Check format of boolan and integer values. */
463	TAILQ_FOREACH(p, &j->params, tq) {
464		if (!TAILQ_EMPTY(&p->val) && (p->flags & (PF_BOOL | PF_INT))) {
465			val = TAILQ_LAST(&p->val, cfstrings)->s;
466			if (p->flags & PF_BOOL) {
467				if (strcasecmp(val, "false") &&
468				    strcasecmp(val, "true") &&
469				    ((void)strtol(val, &ep, 10), *ep)) {
470					jail_warnx(j,
471					    "%s: unknown boolean value \"%s\"",
472					    p->name, val);
473					error = -1;
474				}
475			} else {
476				(void)strtol(val, &ep, 10);
477				if (ep == val || *ep) {
478					jail_warnx(j,
479					    "%s: non-integer value \"%s\"",
480					    p->name, val);
481					error = -1;
482				}
483			}
484		}
485	}
486
487#if defined(INET) || defined(INET6)
488	/*
489	 * The ip_hostname parameter looks up the hostname, and adds parameters
490	 * for any IP addresses it finds.
491	 */
492	if (((j->flags & JF_OP_MASK) != JF_STOP ||
493	    j->intparams[IP_INTERFACE] != NULL) &&
494	    bool_param(j->intparams[IP_IP_HOSTNAME]) &&
495	    (hostname = string_param(j->intparams[KP_HOST_HOSTNAME]))) {
496		j->intparams[IP_IP_HOSTNAME] = NULL;
497		/*
498		 * Silently ignore unsupported address families from
499		 * DNS lookups.
500		 */
501#ifdef INET
502		ip4ok = feature_present("inet");
503#endif
504#ifdef INET6
505		ip6ok = feature_present("inet6");
506#endif
507		if (
508#if defined(INET) && defined(INET6)
509		    ip4ok || ip6ok
510#elif defined(INET)
511		    ip4ok
512#elif defined(INET6)
513		    ip6ok
514#endif
515			 ) {
516			/* Look up the hostname (or get the address) */
517			memset(&hints, 0, sizeof(hints));
518			hints.ai_socktype = SOCK_STREAM;
519			hints.ai_family =
520#if defined(INET) && defined(INET6)
521			    ip4ok ? (ip6ok ? PF_UNSPEC : PF_INET) :  PF_INET6;
522#elif defined(INET)
523			    PF_INET;
524#elif defined(INET6)
525			    PF_INET6;
526#endif
527			gicode = getaddrinfo(hostname, NULL, &hints, &ai0);
528			if (gicode != 0) {
529				jail_warnx(j, "host.hostname %s: %s", hostname,
530				    gai_strerror(gicode));
531				error = -1;
532			} else {
533				/*
534				 * Convert the addresses to ASCII so jailparam
535				 * can convert them back.  Errors are not
536				 * expected here.
537				 */
538				for (ai = ai0; ai; ai = ai->ai_next)
539					switch (ai->ai_family) {
540#ifdef INET
541					case AF_INET:
542						memcpy(&addr4,
543						    &((struct sockaddr_in *)
544						    (void *)ai->ai_addr)->
545						    sin_addr, sizeof(addr4));
546						if (inet_ntop(AF_INET,
547						    &addr4, avalue4,
548						    INET_ADDRSTRLEN) == NULL)
549							err(1, "inet_ntop");
550						add_param(j, NULL, KP_IP4_ADDR,
551						    avalue4);
552						break;
553#endif
554#ifdef INET6
555					case AF_INET6:
556						memcpy(&addr6,
557						    &((struct sockaddr_in6 *)
558						    (void *)ai->ai_addr)->
559						    sin6_addr, sizeof(addr6));
560						if (inet_ntop(AF_INET6,
561						    &addr6, avalue6,
562						    INET6_ADDRSTRLEN) == NULL)
563							err(1, "inet_ntop");
564						add_param(j, NULL, KP_IP6_ADDR,
565						    avalue6);
566						break;
567#endif
568					}
569				freeaddrinfo(ai0);
570			}
571		}
572	}
573
574	/*
575	 * IP addresses may include an interface to set that address on,
576	 * and a netmask/suffix for that address.
577	 */
578	defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
579#ifdef INET
580	if (j->intparams[KP_IP4_ADDR] != NULL) {
581		TAILQ_FOREACH(s, &j->intparams[KP_IP4_ADDR]->val, tq) {
582			cs = strchr(s->s, '|');
583			if (cs || defif)
584				add_param(j, NULL, IP__IP4_IFADDR, s->s);
585			if (cs) {
586				strcpy(s->s, cs + 1);
587				s->len -= cs + 1 - s->s;
588			}
589			if ((cs = strchr(s->s, '/'))) {
590				prefix = strtol(cs + 1, &ep, 10);
591				if (*ep == '.'
592				    ? inet_pton(AF_INET, cs + 1, &addr4) != 1
593				    : *ep || prefix < 0 || prefix > 32) {
594					jail_warnx(j,
595					    "ip4.addr: bad netmask \"%s\"", cs);
596					error = -1;
597				}
598				*cs = '\0';
599				s->len = cs - s->s + 1;
600			}
601		}
602	}
603#endif
604#ifdef INET6
605	if (j->intparams[KP_IP6_ADDR] != NULL) {
606		TAILQ_FOREACH(s, &j->intparams[KP_IP6_ADDR]->val, tq) {
607			cs = strchr(s->s, '|');
608			if (cs || defif)
609				add_param(j, NULL, IP__IP6_IFADDR, s->s);
610			if (cs) {
611				strcpy(s->s, cs + 1);
612				s->len -= cs + 1 - s->s;
613			}
614			if ((cs = strchr(s->s, '/'))) {
615				prefix = strtol(cs + 1, &ep, 10);
616				if (*ep || prefix < 0 || prefix > 128) {
617					jail_warnx(j,
618					    "ip6.addr: bad prefixlen \"%s\"",
619					    cs);
620					error = -1;
621				}
622				*cs = '\0';
623				s->len = cs - s->s + 1;
624			}
625		}
626	}
627#endif
628#endif
629
630	/*
631	 * Read mount.fstab file(s), and treat each line as its own mount
632	 * parameter.
633	 */
634	if (j->intparams[IP_MOUNT_FSTAB] != NULL) {
635		TAILQ_FOREACH(s, &j->intparams[IP_MOUNT_FSTAB]->val, tq) {
636			if (s->len == 0)
637				continue;
638			f = fopen(s->s, "r");
639			if (f == NULL) {
640				jail_warnx(j, "mount.fstab: %s: %s",
641				    s->s, strerror(errno));
642				error = -1;
643				continue;
644			}
645			while ((ln = fgetln(f, &lnlen))) {
646				if ((cs = memchr(ln, '#', lnlen - 1)))
647					lnlen = cs - ln + 1;
648				if (ln[lnlen - 1] == '\n' ||
649				    ln[lnlen - 1] == '#')
650					ln[lnlen - 1] = '\0';
651				else {
652					cs = alloca(lnlen + 1);
653					strlcpy(cs, ln, lnlen + 1);
654					ln = cs;
655				}
656				add_param(j, NULL, IP__MOUNT_FROM_FSTAB, ln);
657			}
658			fclose(f);
659		}
660	}
661	if (error)
662		failed(j);
663	return error;
664}
665
666/*
667 * Import parameters into libjail's binary jailparam format.
668 */
669int
670import_params(struct cfjail *j)
671{
672	struct cfparam *p;
673	struct cfstring *s, *ts;
674	struct jailparam *jp;
675	char *value, *cs;
676	size_t vallen;
677	int error;
678
679	error = 0;
680	j->njp = 0;
681	TAILQ_FOREACH(p, &j->params, tq)
682		if (!(p->flags & PF_INTERNAL))
683			j->njp++;
684	j->jp = jp = emalloc(j->njp * sizeof(struct jailparam));
685	TAILQ_FOREACH(p, &j->params, tq) {
686		if (p->flags & PF_INTERNAL)
687			continue;
688		if (jailparam_init(jp, p->name) < 0) {
689			error = -1;
690			jail_warnx(j, "%s", jail_errmsg);
691			continue;
692		}
693		if (TAILQ_EMPTY(&p->val))
694			value = NULL;
695		else if (!jp->jp_elemlen ||
696			 !TAILQ_NEXT(TAILQ_FIRST(&p->val), tq)) {
697			/*
698			 * Scalar parameters silently discard multiple (array)
699			 * values, keeping only the last value added.  This
700			 * lets values added from the command line append to
701			 * arrays wthout pre-checking the type.
702			 */
703			value = TAILQ_LAST(&p->val, cfstrings)->s;
704		} else {
705			/*
706			 * Convert arrays into comma-separated strings, which
707			 * jailparam_import will then convert back into arrays.
708			 */
709			vallen = 0;
710			TAILQ_FOREACH(s, &p->val, tq)
711				vallen += s->len + 1;
712			value = alloca(vallen);
713			cs = value;
714			TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
715				strcpy(cs, s->s);
716				if (ts != NULL) {
717					cs += s->len + 1;
718					cs[-1] = ',';
719				}
720			}
721		}
722		if (jailparam_import(jp, value) < 0) {
723			error = -1;
724			jail_warnx(j, "%s", jail_errmsg);
725		}
726		jp++;
727	}
728	if (error) {
729		jailparam_free(j->jp, j->njp);
730		free(j->jp);
731		j->jp = NULL;
732		failed(j);
733	}
734	return error;
735}
736
737/*
738 * Check if options are equal (with or without the "no" prefix).
739 */
740int
741equalopts(const char *opt1, const char *opt2)
742{
743	char *p;
744
745	/* "opt" vs. "opt" or "noopt" vs. "noopt" */
746	if (strcmp(opt1, opt2) == 0)
747		return (1);
748	/* "noopt" vs. "opt" */
749	if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
750		return (1);
751	/* "opt" vs. "noopt" */
752	if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
753		return (1);
754	while ((p = strchr(opt1, '.')) != NULL &&
755	    !strncmp(opt1, opt2, ++p - opt1)) {
756		opt2 += p - opt1;
757		opt1 = p;
758		/* "foo.noopt" vs. "foo.opt" */
759		if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
760			return (1);
761		/* "foo.opt" vs. "foo.noopt" */
762		if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
763			return (1);
764	}
765	return (0);
766}
767
768/*
769 * See if a jail name matches a wildcard.
770 */
771int
772wild_jail_match(const char *jname, const char *wname)
773{
774	const char *jc, *jd, *wc, *wd;
775
776	/*
777	 * A non-final "*" component in the wild name matches a single jail
778	 * component, and a final "*" matches one or more jail components.
779	 */
780	for (jc = jname, wc = wname;
781	     (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
782	     jc = jd + 1, wc = wd + 1)
783		if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
784			return 0;
785	return (!strcmp(jc, wc) || !strcmp(wc, "*"));
786}
787
788/*
789 * Return if a jail name is a wildcard.
790 */
791int
792wild_jail_name(const char *wname)
793{
794	const char *wc;
795
796	for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
797		if ((wc == wname || wc[-1] == '.') &&
798		    (wc[1] == '\0' || wc[1] == '.'))
799			return 1;
800	return 0;
801}
802
803/*
804 * Free a parameter record and all its strings and variables.
805 */
806static void
807free_param(struct cfparams *pp, struct cfparam *p)
808{
809	free(p->name);
810	free_param_strings(p);
811	TAILQ_REMOVE(pp, p, tq);
812	free(p);
813}
814
815static void
816free_param_strings(struct cfparam *p)
817{
818	struct cfstring *s;
819	struct cfvar *v;
820
821	while ((s = TAILQ_FIRST(&p->val))) {
822		free(s->s);
823		while ((v = STAILQ_FIRST(&s->vars))) {
824			free(v->name);
825			STAILQ_REMOVE_HEAD(&s->vars, tq);
826			free(v);
827		}
828		TAILQ_REMOVE(&p->val, s, tq);
829		free(s);
830	}
831}
832