usr.sbin/jail/config.c

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