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