usr.sbin/jail/config.c

   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("$FreeBSD$");
  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
  47 struct ipspec {
  48         const char      *name;
  49         unsigned        flags;
  50 };
  51
  52 extern FILE *yyin;
  53 extern int yynerrs;
  54
  55 struct cfjails cfjails = TAILQ_HEAD_INITIALIZER(cfjails);
  56
  57 static void free_param(struct cfparams *pp, struct cfparam *p);
  58 static void free_param_strings(struct cfparam *p);
  59
  60 static 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 | PF_REV},
  83     [IP_MOUNT_DEVFS] =          {"mount.devfs",         PF_INTERNAL | PF_BOOL},
  84     [IP_MOUNT_FSTAB] =          {"mount.fstab",         PF_INTERNAL},
  85     [IP_STOP_TIMEOUT] =         {"stop.timeout",        PF_INTERNAL | PF_INT},
  86     [IP_VNET_INTERFACE] =       {"vnet.interface",      PF_INTERNAL},
  87 #ifdef INET
  88     [IP__IP4_IFADDR] =          {"ip4.addr",    PF_INTERNAL | PF_CONV | PF_REV},
  89 #endif
  90 #ifdef INET6
  91     [IP__IP6_IFADDR] =          {"ip6.addr",    PF_INTERNAL | PF_CONV | PF_REV},
  92 #endif
  93     [IP__MOUNT_FROM_FSTAB] =    {"mount.fstab", PF_INTERNAL | PF_CONV | PF_REV},
  94     [IP__OP] =                  {NULL,                  PF_CONV},
  95     [KP_ALLOW_CHFLAGS] =        {"allow.chflags",       0},
  96     [KP_ALLOW_MOUNT] =          {"allow.mount",         0},
  97     [KP_ALLOW_RAW_SOCKETS] =    {"allow.raw_sockets",   0},
  98     [KP_ALLOW_SET_HOSTNAME]=    {"allow.set_hostname",  0},
  99     [KP_ALLOW_SOCKET_AF] =      {"allow.socket_af",     0},
 100     [KP_ALLOW_SYSVIPC] =        {"allow.sysvipc",       0},
 101     [KP_DEVFS_RULESET] =        {"devfs_ruleset",       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  */
 121 void
 122 load_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  */
 272 struct cfjail *
 273 add_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  */
 290 void
 291 add_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 != IP__NULL) {
 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 != IP__NULL)
 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 != IP__NULL)
 379                         j->intparams[ipnum] = np;
 380                 else
 381                         for (ipnum = IP__NULL + 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  */
 394 int
 395 bool_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  */
 411 int
 412 int_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  */
 423 const char *
 424 string_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  */
 434 int
 435 check_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;
 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;
 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  */
 669 int
 670 import_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                                 memcpy(cs, s->s, s->len);
 716                                 cs += s->len + 1;
 717                                 cs[-1] = ',';
 718                         }
 719                         value[vallen - 1] = '\0';
 720                 }
 721                 if (jailparam_import(jp, value) < 0) {
 722                         error = -1;
 723                         jail_warnx(j, "%s", jail_errmsg);
 724                 }
 725                 jp++;
 726         }
 727         if (error) {
 728                 jailparam_free(j->jp, j->njp);
 729                 free(j->jp);
 730                 j->jp = NULL;
 731                 failed(j);
 732         }
 733         return error;
 734 }
 735
 736 /*
 737  * Check if options are equal (with or without the "no" prefix).
 738  */
 739 int
 740 equalopts(const char *opt1, const char *opt2)
 741 {
 742         char *p;
 743
 744         /* "opt" vs. "opt" or "noopt" vs. "noopt" */
 745         if (strcmp(opt1, opt2) == 0)
 746                 return (1);
 747         /* "noopt" vs. "opt" */
 748         if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
 749                 return (1);
 750         /* "opt" vs. "noopt" */
 751         if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
 752                 return (1);
 753         while ((p = strchr(opt1, '.')) != NULL &&
 754             !strncmp(opt1, opt2, ++p - opt1)) {
 755                 opt2 += p - opt1;
 756                 opt1 = p;
 757                 /* "foo.noopt" vs. "foo.opt" */
 758                 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
 759                         return (1);
 760                 /* "foo.opt" vs. "foo.noopt" */
 761                 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
 762                         return (1);
 763         }
 764         return (0);
 765 }
 766
 767 /*
 768  * See if a jail name matches a wildcard.
 769  */
 770 int
 771 wild_jail_match(const char *jname, const char *wname)
 772 {
 773         const char *jc, *jd, *wc, *wd;
 774
 775         /*
 776          * A non-final "*" component in the wild name matches a single jail
 777          * component, and a final "*" matches one or more jail components.
 778          */
 779         for (jc = jname, wc = wname;
 780              (jd = strchr(jc, '.')) && (wd = strchr(wc, '.'));
 781              jc = jd + 1, wc = wd + 1)
 782                 if (strncmp(jc, wc, jd - jc + 1) && strncmp(wc, "*.", 2))
 783                         return 0;
 784         return (!strcmp(jc, wc) || !strcmp(wc, "*"));
 785 }
 786
 787 /*
 788  * Return if a jail name is a wildcard.
 789  */
 790 int
 791 wild_jail_name(const char *wname)
 792 {
 793         const char *wc;
 794
 795         for (wc = strchr(wname, '*'); wc; wc = strchr(wc + 1, '*'))
 796                 if ((wc == wname || wc[-1] == '.') &&
 797                     (wc[1] == '\0' || wc[1] == '.'))
 798                         return 1;
 799         return 0;
 800 }
 801
 802 /*
 803  * Free a parameter record and all its strings and variables.
 804  */
 805 static void
 806 free_param(struct cfparams *pp, struct cfparam *p)
 807 {
 808         free(p->name);
 809         free_param_strings(p);
 810         TAILQ_REMOVE(pp, p, tq);
 811         free(p);
 812 }
 813
 814 static void
 815 free_param_strings(struct cfparam *p)
 816 {
 817         struct cfstring *s;
 818         struct cfvar *v;
 819
 820         while ((s = TAILQ_FIRST(&p->val))) {
 821                 free(s->s);
 822                 while ((v = STAILQ_FIRST(&s->vars))) {
 823                         free(v->name);
 824                         STAILQ_REMOVE_HEAD(&s->vars, tq);
 825                         free(v);
 826                 }
 827                 TAILQ_REMOVE(&p->val, s, tq);
 828                 free(s);
 829         }
 830 }