usr.sbin/jail/jail.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 1999 Poul-Henning Kamp.
   5  * Copyright (c) 2009-2012 James Gritton
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <sys/socket.h>
  36 #include <sys/sysctl.h>
  37
  38 #include <arpa/inet.h>
  39 #include <netinet/in.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <stdarg.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "jailp.h"
  50
  51 #define JP_RDTUN(jp)    (((jp)->jp_ctltype & CTLFLAG_RDTUN) == CTLFLAG_RDTUN)
  52
  53 struct permspec {
  54         const char      *name;
  55         enum intparam   ipnum;
  56         int             rev;
  57 };
  58
  59 const char *cfname;
  60 int iflag;
  61 int note_remove;
  62 int verbose;
  63
  64 static void clear_persist(struct cfjail *j);
  65 static int update_jail(struct cfjail *j);
  66 static int rdtun_params(struct cfjail *j, int dofail);
  67 static void running_jid(struct cfjail *j, int dflag);
  68 static void jail_quoted_warnx(const struct cfjail *j, const char *name_msg,
  69     const char *noname_msg);
  70 static int jailparam_set_note(const struct cfjail *j, struct jailparam *jp,
  71     unsigned njp, int flags);
  72 static void print_jail(FILE *fp, struct cfjail *j, int oldcl);
  73 static void print_param(FILE *fp, const struct cfparam *p, int sep, int doname);
  74 static void quoted_print(FILE *fp, char *str);
  75 static void usage(void);
  76
  77 static struct permspec perm_sysctl[] = {
  78     { "security.jail.set_hostname_allowed", KP_ALLOW_SET_HOSTNAME, 0 },
  79     { "security.jail.sysvipc_allowed", KP_ALLOW_SYSVIPC, 0 },
  80     { "security.jail.allow_raw_sockets", KP_ALLOW_RAW_SOCKETS, 0 },
  81     { "security.jail.chflags_allowed", KP_ALLOW_CHFLAGS, 0 },
  82     { "security.jail.mount_allowed", KP_ALLOW_MOUNT, 0 },
  83     { "security.jail.socket_unixiproute_only", KP_ALLOW_SOCKET_AF, 1 },
  84 };
  85
  86 static const enum intparam startcommands[] = {
  87     IP__NULL,
  88 #ifdef INET
  89     IP__IP4_IFADDR,
  90 #endif
  91 #ifdef INET6
  92     IP__IP6_IFADDR,
  93 #endif
  94     IP_MOUNT,
  95     IP__MOUNT_FROM_FSTAB,
  96     IP_MOUNT_DEVFS,
  97     IP_MOUNT_FDESCFS,
  98     IP_MOUNT_PROCFS,
  99     IP_EXEC_PRESTART,
 100     IP__OP,
 101     IP_EXEC_CREATED,
 102     IP_VNET_INTERFACE,
 103     IP_EXEC_START,
 104     IP_COMMAND,
 105     IP_EXEC_POSTSTART,
 106     IP__NULL
 107 };
 108
 109 static const enum intparam stopcommands[] = {
 110     IP__NULL,
 111     IP_EXEC_PRESTOP,
 112     IP_EXEC_STOP,
 113     IP_STOP_TIMEOUT,
 114     IP__OP,
 115     IP_EXEC_POSTSTOP,
 116     IP_MOUNT_PROCFS,
 117     IP_MOUNT_FDESCFS,
 118     IP_MOUNT_DEVFS,
 119     IP__MOUNT_FROM_FSTAB,
 120     IP_MOUNT,
 121 #ifdef INET6
 122     IP__IP6_IFADDR,
 123 #endif
 124 #ifdef INET
 125     IP__IP4_IFADDR,
 126 #endif
 127     IP__NULL
 128 };
 129
 130 int
 131 main(int argc, char **argv)
 132 {
 133         struct stat st;
 134         FILE *jfp;
 135         struct cfjail *j;
 136         char *JidFile;
 137         size_t sysvallen;
 138         unsigned op, pi;
 139         int ch, docf, error, i, oldcl, sysval;
 140         int dflag, Rflag;
 141 #if defined(INET) || defined(INET6)
 142         char *cs, *ncs;
 143 #endif
 144 #if defined(INET) && defined(INET6)
 145         struct in6_addr addr6;
 146 #endif
 147
 148         op = 0;
 149         dflag = Rflag = 0;
 150         docf = 1;
 151         cfname = CONF_FILE;
 152         JidFile = NULL;
 153
 154         while ((ch = getopt(argc, argv, "cdf:hiJ:lmn:p:qrRs:u:U:v")) != -1) {
 155                 switch (ch) {
 156                 case 'c':
 157                         op |= JF_START;
 158                         break;
 159                 case 'd':
 160                         dflag = 1;
 161                         break;
 162                 case 'f':
 163                         cfname = optarg;
 164                         break;
 165                 case 'h':
 166 #if defined(INET) || defined(INET6)
 167                         add_param(NULL, NULL, IP_IP_HOSTNAME, NULL);
 168 #endif
 169                         docf = 0;
 170                         break;
 171                 case 'i':
 172                         iflag = 1;
 173                         verbose = -1;
 174                         break;
 175                 case 'J':
 176                         JidFile = optarg;
 177                         break;
 178                 case 'l':
 179                         add_param(NULL, NULL, IP_EXEC_CLEAN, NULL);
 180                         docf = 0;
 181                         break;
 182                 case 'm':
 183                         op |= JF_SET;
 184                         break;
 185                 case 'n':
 186                         add_param(NULL, NULL, KP_NAME, optarg);
 187                         docf = 0;
 188                         break;
 189                 case 'p':
 190                         paralimit = strtol(optarg, NULL, 10);
 191                         if (paralimit == 0)
 192                                 paralimit = -1;
 193                         break;
 194                 case 'q':
 195                         verbose = -1;
 196                         break;
 197                 case 'r':
 198                         op |= JF_STOP;
 199                         break;
 200                 case 'R':
 201                         op |= JF_STOP;
 202                         Rflag = 1;
 203                         break;
 204                 case 's':
 205                         add_param(NULL, NULL, KP_SECURELEVEL, optarg);
 206                         docf = 0;
 207                         break;
 208                 case 'u':
 209                         add_param(NULL, NULL, IP_EXEC_JAIL_USER, optarg);
 210                         add_param(NULL, NULL, IP_EXEC_SYSTEM_JAIL_USER, NULL);
 211                         docf = 0;
 212                         break;
 213                 case 'U':
 214                         add_param(NULL, NULL, IP_EXEC_JAIL_USER, optarg);
 215                         add_param(NULL, NULL, IP_EXEC_SYSTEM_JAIL_USER,
 216                             "false");
 217                         docf = 0;
 218                         break;
 219                 case 'v':
 220                         verbose = 1;
 221                         break;
 222                 default:
 223                         usage();
 224                 }
 225         }
 226         argc -= optind;
 227         argv += optind;
 228
 229         /* Find out which of the four command line styles this is. */
 230         oldcl = 0;
 231         if (!op) {
 232                 /* Old-style command line with four fixed parameters */
 233                 if (argc < 4 || argv[0][0] != '/')
 234                         usage();
 235                 op = JF_START;
 236                 docf = 0;
 237                 oldcl = 1;
 238                 add_param(NULL, NULL, KP_PATH, argv[0]);
 239                 add_param(NULL, NULL, KP_HOST_HOSTNAME, argv[1]);
 240 #if defined(INET) || defined(INET6)
 241                 if (argv[2][0] != '\0') {
 242                         for (cs = argv[2];; cs = ncs + 1) {
 243                                 ncs = strchr(cs, ',');
 244                                 if (ncs)
 245                                         *ncs = '\0';
 246                                 add_param(NULL, NULL,
 247 #if defined(INET) && defined(INET6)
 248                                     inet_pton(AF_INET6, cs, &addr6) == 1
 249                                     ? KP_IP6_ADDR : KP_IP4_ADDR,
 250 #elif defined(INET)
 251                                     KP_IP4_ADDR,
 252 #elif defined(INET6)
 253                                     KP_IP6_ADDR,
 254 #endif
 255                                     cs);
 256                                 if (!ncs)
 257                                         break;
 258                         }
 259                 }
 260 #endif
 261                 for (i = 3; i < argc; i++)
 262                         add_param(NULL, NULL, IP_COMMAND, argv[i]);
 263                 /* Emulate the defaults from security.jail.* sysctls. */
 264                 sysvallen = sizeof(sysval);
 265                 if (sysctlbyname("security.jail.jailed", &sysval, &sysvallen,
 266                     NULL, 0) == 0 && sysval == 0) {
 267                         for (pi = 0; pi < sizeof(perm_sysctl) /
 268                              sizeof(perm_sysctl[0]); pi++) {
 269                                 sysvallen = sizeof(sysval);
 270                                 if (sysctlbyname(perm_sysctl[pi].name,
 271                                     &sysval, &sysvallen, NULL, 0) == 0)
 272                                         add_param(NULL, NULL,
 273                                             perm_sysctl[pi].ipnum,
 274                                             (sysval ? 1 : 0) ^
 275                                             perm_sysctl[pi].rev
 276                                             ? NULL : "false");
 277                         }
 278                 }
 279         } else if (op == JF_STOP) {
 280                 /* Jail remove, perhaps using the config file */
 281                 if (!docf || argc == 0)
 282                         usage();
 283                 if (!Rflag)
 284                         for (i = 0; i < argc; i++)
 285                                 if (strchr(argv[i], '='))
 286                                         usage();
 287                 if ((docf = !Rflag &&
 288                      (!strcmp(cfname, "-") || stat(cfname, &st) == 0)))
 289                         load_config();
 290                 note_remove = docf || argc > 1 || wild_jail_name(argv[0]);
 291         } else if (argc > 1 || (argc == 1 && strchr(argv[0], '='))) {
 292                 /* Single jail specified on the command line */
 293                 if (Rflag)
 294                         usage();
 295                 docf = 0;
 296                 for (i = 0; i < argc; i++) {
 297                         if (!strncmp(argv[i], "command", 7) &&
 298                             (argv[i][7] == '\0' || argv[i][7] == '=')) {
 299                                 if (argv[i][7]  == '=')
 300                                         add_param(NULL, NULL, IP_COMMAND,
 301                                             argv[i] + 8);
 302                                 for (i++; i < argc; i++)
 303                                         add_param(NULL, NULL, IP_COMMAND,
 304                                             argv[i]);
 305                         }
 306 #ifdef INET
 307                         else if (!strncmp(argv[i], "ip4.addr=", 9)) {
 308                                 for (cs = argv[i] + 9;; cs = ncs + 1) {
 309                                         ncs = strchr(cs, ',');
 310                                         if (ncs)
 311                                                 *ncs = '\0';
 312                                         add_param(NULL, NULL, KP_IP4_ADDR, cs);
 313                                         if (!ncs)
 314                                                 break;
 315                                 }
 316                         }
 317 #endif
 318 #ifdef INET6
 319                         else if (!strncmp(argv[i], "ip6.addr=", 9)) {
 320                                 for (cs = argv[i] + 9;; cs = ncs + 1) {
 321                                         ncs = strchr(cs, ',');
 322                                         if (ncs)
 323                                                 *ncs = '\0';
 324                                         add_param(NULL, NULL, KP_IP6_ADDR, cs);
 325                                         if (!ncs)
 326                                                 break;
 327                                 }
 328                         }
 329 #endif
 330                         else
 331                                 add_param(NULL, NULL, 0, argv[i]);
 332                 }
 333         } else {
 334                 /* From the config file, perhaps with a specified jail */
 335                 if (Rflag || !docf)
 336                         usage();
 337                 load_config();
 338         }
 339
 340         /* Find out which jails will be run. */
 341         dep_setup(docf);
 342         error = 0;
 343         if (op == JF_STOP) {
 344                 for (i = 0; i < argc; i++)
 345                         if (start_state(argv[i], docf, op, Rflag) < 0)
 346                                 error = 1;
 347         } else {
 348                 if (start_state(argv[0], docf, op, 0) < 0)
 349                         exit(1);
 350         }
 351
 352         jfp = NULL;
 353         if (JidFile != NULL) {
 354                 jfp = fopen(JidFile, "w");
 355                 if (jfp == NULL)
 356                         err(1, "open %s", JidFile);
 357                 setlinebuf(jfp);
 358         }
 359         setlinebuf(stdout);
 360
 361         /*
 362          * The main loop: Get an available jail and perform the required
 363          * operation on it.  When that is done, the jail may be finished,
 364          * or it may go back for the next step.
 365          */
 366         while ((j = next_jail()))
 367         {
 368                 if (j->flags & JF_FAILED) {
 369                         error = 1;
 370                         if (j->comparam == NULL) {
 371                                 dep_done(j, 0);
 372                                 continue;
 373                         }
 374                 }
 375                 if (!(j->flags & JF_PARAMS))
 376                 {
 377                         j->flags |= JF_PARAMS;
 378                         if (dflag)
 379                                 add_param(j, NULL, IP_ALLOW_DYING, NULL);
 380                         if (check_intparams(j) < 0)
 381                                 continue;
 382                         if ((j->flags & (JF_START | JF_SET)) &&
 383                             import_params(j) < 0)
 384                                 continue;
 385                 }
 386                 if (!j->jid)
 387                         running_jid(j,
 388                             (j->flags & (JF_SET | JF_DEPEND)) == JF_SET
 389                             ? dflag || bool_param(j->intparams[IP_ALLOW_DYING])
 390                             : 0);
 391                 if (finish_command(j))
 392                         continue;
 393
 394                 switch (j->flags & JF_OP_MASK) {
 395                         /*
 396                          * These operations just turn into a different op
 397                          * depending on the jail's current status.
 398                          */
 399                 case JF_START_SET:
 400                         j->flags = j->jid < 0 ? JF_START : JF_SET;
 401                         break;
 402                 case JF_SET_RESTART:
 403                         if (j->jid < 0) {
 404                                 jail_quoted_warnx(j, "not found",
 405                                     "no jail specified");
 406                                 failed(j);
 407                                 continue;
 408                         }
 409                         j->flags = rdtun_params(j, 0) ? JF_RESTART : JF_SET;
 410                         if (j->flags == JF_RESTART)
 411                                 dep_reset(j);
 412                         break;
 413                 case JF_START_SET_RESTART:
 414                         j->flags = j->jid < 0 ? JF_START
 415                             : rdtun_params(j, 0) ? JF_RESTART : JF_SET;
 416                         if (j->flags == JF_RESTART)
 417                                 dep_reset(j);
 418                 }
 419
 420                 switch (j->flags & JF_OP_MASK) {
 421                 case JF_START:
 422                         if (j->comparam == NULL) {
 423                                 if (j->jid > 0 &&
 424                                     !(j->flags & (JF_DEPEND | JF_WILD))) {
 425                                         jail_quoted_warnx(j, "already exists",
 426                                             NULL);
 427                                         failed(j);
 428                                         continue;
 429                                 }
 430                                 if (dep_check(j))
 431                                         continue;
 432                                 if (j->jid > 0)
 433                                         goto jail_create_done;
 434                                 j->comparam = startcommands;
 435                                 j->comstring = NULL;
 436                         }
 437                         if (next_command(j))
 438                                 continue;
 439                 jail_create_done:
 440                         clear_persist(j);
 441                         if (jfp != NULL)
 442                                 print_jail(jfp, j, oldcl);
 443                         dep_done(j, 0);
 444                         break;
 445
 446                 case JF_SET:
 447                         if (j->jid < 0 && !(j->flags & JF_DEPEND)) {
 448                                 jail_quoted_warnx(j, "not found",
 449                                     "no jail specified");
 450                                 failed(j);
 451                                 continue;
 452                         }
 453                         if (dep_check(j))
 454                                 continue;
 455                         if (!(j->flags & JF_DEPEND)) {
 456                                 if (rdtun_params(j, 1) < 0 ||
 457                                     update_jail(j) < 0)
 458                                         continue;
 459                                 if (verbose >= 0 && (j->name || verbose > 0))
 460                                         jail_note(j, "updated\n");
 461                         }
 462                         dep_done(j, 0);
 463                         break;
 464
 465                 case JF_STOP:
 466                 case JF_RESTART:
 467                         if (j->comparam == NULL) {
 468                                 if (dep_check(j))
 469                                         continue;
 470                                 if (j->jid < 0) {
 471                                         if (!(j->flags & (JF_DEPEND|JF_WILD))) {
 472                                                 if (verbose >= 0)
 473                                                         jail_quoted_warnx(j,
 474                                                             "not found", NULL);
 475                                                 failed(j);
 476                                         }
 477                                         goto jail_remove_done;
 478                                 }
 479                                 j->comparam = stopcommands;
 480                                 j->comstring = NULL;
 481                         } else if ((j->flags & JF_FAILED) && j->jid > 0)
 482                                 goto jail_remove_done;
 483                         if (next_command(j))
 484                                 continue;
 485                 jail_remove_done:
 486                         dep_done(j, 0);
 487                         if ((j->flags & (JF_START | JF_FAILED)) == JF_START) {
 488                                 j->comparam = NULL;
 489                                 j->flags &= ~JF_STOP;
 490                                 dep_reset(j);
 491                                 requeue(j, j->ndeps ? &depend : &ready);
 492                         }
 493                         break;
 494                 }
 495         }
 496
 497         if (jfp != NULL)
 498                 fclose(jfp);
 499         exit(error);
 500 }
 501
 502 /*
 503  * Mark a jail's failure for future handling.
 504  */
 505 void
 506 failed(struct cfjail *j)
 507 {
 508         j->flags |= JF_FAILED;
 509         TAILQ_REMOVE(j->queue, j, tq);
 510         TAILQ_INSERT_HEAD(&ready, j, tq);
 511         j->queue = &ready;
 512 }
 513
 514 /*
 515  * Exit slightly more gracefully when out of memory.
 516  */
 517 void *
 518 emalloc(size_t size)
 519 {
 520         void *p;
 521
 522         p = malloc(size);
 523         if (!p)
 524                 err(1, "malloc");
 525         return p;
 526 }
 527
 528 void *
 529 erealloc(void *ptr, size_t size)
 530 {
 531         void *p;
 532
 533         p = realloc(ptr, size);
 534         if (!p)
 535                 err(1, "malloc");
 536         return p;
 537 }
 538
 539 char *
 540 estrdup(const char *str)
 541 {
 542         char *ns;
 543
 544         ns = strdup(str);
 545         if (!ns)
 546                 err(1, "malloc");
 547         return ns;
 548 }
 549
 550 /*
 551  * Print a message including an optional jail name.
 552  */
 553 void
 554 jail_note(const struct cfjail *j, const char *fmt, ...)
 555 {
 556         va_list ap, tap;
 557         char *cs;
 558         size_t len;
 559
 560         va_start(ap, fmt);
 561         va_copy(tap, ap);
 562         len = vsnprintf(NULL, 0, fmt, tap);
 563         va_end(tap);
 564         cs = alloca(len + 1);
 565         (void)vsnprintf(cs, len + 1, fmt, ap);
 566         va_end(ap);
 567         if (j->name)
 568                 printf("%s: %s", j->name, cs);
 569         else
 570                 printf("%s", cs);
 571 }
 572
 573 /*
 574  * Print a warning message including an optional jail name.
 575  */
 576 void
 577 jail_warnx(const struct cfjail *j, const char *fmt, ...)
 578 {
 579         va_list ap, tap;
 580         char *cs;
 581         size_t len;
 582
 583         va_start(ap, fmt);
 584         va_copy(tap, ap);
 585         len = vsnprintf(NULL, 0, fmt, tap);
 586         va_end(tap);
 587         cs = alloca(len + 1);
 588         (void)vsnprintf(cs, len + 1, fmt, ap);
 589         va_end(ap);
 590         if (j->name)
 591                 warnx("%s: %s", j->name, cs);
 592         else
 593                 warnx("%s", cs);
 594 }
 595
 596 /*
 597  * Create a new jail.
 598  */
 599 int
 600 create_jail(struct cfjail *j)
 601 {
 602         struct iovec jiov[4];
 603         struct stat st;
 604         struct jailparam *jp, *setparams, *setparams2, *sjp;
 605         const char *path;
 606         int dopersist, ns, jid, dying, didfail;
 607
 608         /*
 609          * Check the jail's path, with a better error message than jail_set
 610          * gives.
 611          */
 612         if ((path = string_param(j->intparams[KP_PATH]))) {
 613                 if (j->name != NULL && path[0] != '/') {
 614                         jail_warnx(j, "path %s: not an absolute pathname",
 615                             path);
 616                         return -1;
 617                 }
 618                 if (stat(path, &st) < 0) {
 619                         jail_warnx(j, "path %s: %s", path, strerror(errno));
 620                         return -1;
 621                 }
 622                 if (!S_ISDIR(st.st_mode)) {
 623                         jail_warnx(j, "path %s: %s", path, strerror(ENOTDIR));
 624                         return -1;
 625                 }
 626         }
 627
 628         /*
 629          * Copy all the parameters, except that "persist" is always set when
 630          * there are commands to run later.
 631          */
 632         dopersist = !bool_param(j->intparams[KP_PERSIST]) &&
 633             (j->intparams[IP_EXEC_START] || j->intparams[IP_COMMAND] ||
 634              j->intparams[IP_EXEC_POSTSTART]);
 635         sjp = setparams =
 636             alloca((j->njp + dopersist) * sizeof(struct jailparam));
 637         if (dopersist && jailparam_init(sjp++, "persist") < 0) {
 638                 jail_warnx(j, "%s", jail_errmsg);
 639                 return -1;
 640         }
 641         for (jp = j->jp; jp < j->jp + j->njp; jp++)
 642                 if (!dopersist || !equalopts(jp->jp_name, "persist"))
 643                         *sjp++ = *jp;
 644         ns = sjp - setparams;
 645
 646         didfail = 0;
 647         j->jid = jailparam_set_note(j, setparams, ns, JAIL_CREATE);
 648         if (j->jid < 0 && errno == EEXIST &&
 649             bool_param(j->intparams[IP_ALLOW_DYING]) &&
 650             int_param(j->intparams[KP_JID], &jid) && jid != 0) {
 651                 /*
 652                  * The jail already exists, but may be dying.
 653                  * Make sure it is, in which case an update is appropriate.
 654                  */
 655                 jiov[0].iov_base = __DECONST(char *, "jid");
 656                 jiov[0].iov_len = sizeof("jid");
 657                 jiov[1].iov_base = &jid;
 658                 jiov[1].iov_len = sizeof(jid);
 659                 jiov[2].iov_base = __DECONST(char *, "dying");
 660                 jiov[2].iov_len = sizeof("dying");
 661                 jiov[3].iov_base = &dying;
 662                 jiov[3].iov_len = sizeof(dying);
 663                 if (jail_get(jiov, 4, JAIL_DYING) < 0) {
 664                         /*
 665                          * It could be that the jail just barely finished
 666                          * dying, or it could be that the jid never existed
 667                          * but the name does.  In either case, another try
 668                          * at creating the jail should do the right thing.
 669                          */
 670                         if (errno == ENOENT)
 671                                 j->jid = jailparam_set_note(j, setparams, ns,
 672                                     JAIL_CREATE);
 673                 } else if (dying) {
 674                         j->jid = jid;
 675                         if (rdtun_params(j, 1) < 0) {
 676                                 j->jid = -1;
 677                                 didfail = 1;
 678                         } else {
 679                                 sjp = setparams2 = alloca((j->njp + dopersist) *
 680                                     sizeof(struct jailparam));
 681                                 for (jp = setparams; jp < setparams + ns; jp++)
 682                                         if (!JP_RDTUN(jp) ||
 683                                             !strcmp(jp->jp_name, "jid"))
 684                                                 *sjp++ = *jp;
 685                                 j->jid = jailparam_set_note(j, setparams2,
 686                                     sjp - setparams2, JAIL_UPDATE | JAIL_DYING);
 687                                 /*
 688                                  * Again, perhaps the jail just finished dying.
 689                                  */
 690                                 if (j->jid < 0 && errno == ENOENT)
 691                                         j->jid = jailparam_set_note(j,
 692                                             setparams, ns, JAIL_CREATE);
 693                         }
 694                 }
 695         }
 696         if (j->jid < 0 && !didfail) {
 697                 jail_warnx(j, "%s", jail_errmsg);
 698                 failed(j);
 699         }
 700         if (dopersist) {
 701                 jailparam_free(setparams, 1);
 702                 if (j->jid > 0)
 703                         j->flags |= JF_PERSIST;
 704         }
 705         return j->jid;
 706 }
 707
 708 /*
 709  * Remove a temporarily set "persist" parameter.
 710  */
 711 static void
 712 clear_persist(struct cfjail *j)
 713 {
 714         struct iovec jiov[4];
 715         int jid;
 716
 717         if (!(j->flags & JF_PERSIST))
 718                 return;
 719         j->flags &= ~JF_PERSIST;
 720         jiov[0].iov_base = __DECONST(char *, "jid");
 721         jiov[0].iov_len = sizeof("jid");
 722         jiov[1].iov_base = &j->jid;
 723         jiov[1].iov_len = sizeof(j->jid);
 724         jiov[2].iov_base = __DECONST(char *, "nopersist");
 725         jiov[2].iov_len = sizeof("nopersist");
 726         jiov[3].iov_base = NULL;
 727         jiov[3].iov_len = 0;
 728         jid = jail_set(jiov, 4, JAIL_UPDATE);
 729         if (verbose > 0)
 730                 jail_note(j, "jail_set(JAIL_UPDATE) jid=%d nopersist%s%s\n",
 731                     j->jid, jid < 0 ? ": " : "",
 732                     jid < 0 ? strerror(errno) : "");
 733 }
 734
 735 /*
 736  * Set a jail's parameters.
 737  */
 738 static int
 739 update_jail(struct cfjail *j)
 740 {
 741         struct jailparam *jp, *setparams, *sjp;
 742         int ns, jid;
 743
 744         ns = 0;
 745         for (jp = j->jp; jp < j->jp + j->njp; jp++)
 746                 if (!JP_RDTUN(jp))
 747                         ns++;
 748         if (ns == 0)
 749                 return 0;
 750         sjp = setparams = alloca(++ns * sizeof(struct jailparam));
 751         if (jailparam_init(sjp, "jid") < 0 ||
 752             jailparam_import_raw(sjp, &j->jid, sizeof j->jid) < 0) {
 753                 jail_warnx(j, "%s", jail_errmsg);
 754                 failed(j);
 755                 return -1;
 756         }
 757         for (jp = j->jp; jp < j->jp + j->njp; jp++)
 758                 if (!JP_RDTUN(jp))
 759                         *++sjp = *jp;
 760
 761         jid = jailparam_set_note(j, setparams, ns,
 762             bool_param(j->intparams[IP_ALLOW_DYING])
 763             ? JAIL_UPDATE | JAIL_DYING : JAIL_UPDATE);
 764         if (jid < 0) {
 765                 jail_warnx(j, "%s", jail_errmsg);
 766                 failed(j);
 767         }
 768         jailparam_free(setparams, 1);
 769         return jid;
 770 }
 771
 772 /*
 773  * Return if a jail set would change any create-only parameters.
 774  */
 775 static int
 776 rdtun_params(struct cfjail *j, int dofail)
 777 {
 778         struct jailparam *jp, *rtparams, *rtjp;
 779         int nrt, rval;
 780
 781         if (j->flags & JF_RDTUN)
 782                 return 0;
 783         j->flags |= JF_RDTUN;
 784         nrt = 0;
 785         for (jp = j->jp; jp < j->jp + j->njp; jp++)
 786                 if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid"))
 787                         nrt++;
 788         if (nrt == 0)
 789                 return 0;
 790         rtjp = rtparams = alloca(++nrt * sizeof(struct jailparam));
 791         if (jailparam_init(rtjp, "jid") < 0 ||
 792             jailparam_import_raw(rtjp, &j->jid, sizeof j->jid) < 0) {
 793                 jail_warnx(j, "%s", jail_errmsg);
 794                 exit(1);
 795         }
 796         for (jp = j->jp; jp < j->jp + j->njp; jp++)
 797                 if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid")) {
 798                         *++rtjp = *jp;
 799                         rtjp->jp_value = NULL;
 800                 }
 801         rval = 0;
 802         if (jailparam_get(rtparams, nrt,
 803             bool_param(j->intparams[IP_ALLOW_DYING]) ? JAIL_DYING : 0) > 0) {
 804                 rtjp = rtparams + 1;
 805                 for (jp = j->jp; rtjp < rtparams + nrt; jp++) {
 806                         if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid")) {
 807                                 if (!((jp->jp_flags & (JP_BOOL | JP_NOBOOL)) &&
 808                                     jp->jp_valuelen == 0 &&
 809                                     *(int *)jp->jp_value) &&
 810                                     !(rtjp->jp_valuelen == jp->jp_valuelen &&
 811                                     !((jp->jp_ctltype & CTLTYPE) ==
 812                                     CTLTYPE_STRING ? strncmp(rtjp->jp_value,
 813                                     jp->jp_value, jp->jp_valuelen) :
 814                                     memcmp(rtjp->jp_value, jp->jp_value,
 815                                     jp->jp_valuelen)))) {
 816                                         if (dofail) {
 817                                                 jail_warnx(j, "%s cannot be "
 818                                                     "changed after creation",
 819                                                     jp->jp_name);
 820                                                 failed(j);
 821                                                 rval = -1;
 822                                         } else
 823                                                 rval = 1;
 824                                         break;
 825                                 }
 826                                 rtjp++;
 827                         }
 828                 }
 829         }
 830         for (rtjp = rtparams + 1; rtjp < rtparams + nrt; rtjp++)
 831                 rtjp->jp_name = NULL;
 832         jailparam_free(rtparams, nrt);
 833         return rval;
 834 }
 835
 836 /*
 837  * Get the jail's jid if it is running.
 838  */
 839 static void
 840 running_jid(struct cfjail *j, int dflag)
 841 {
 842         struct iovec jiov[2];
 843         const char *pval;
 844         char *ep;
 845         int jid;
 846
 847         if ((pval = string_param(j->intparams[KP_JID]))) {
 848                 if (!(jid = strtol(pval, &ep, 10)) || *ep) {
 849                         j->jid = -1;
 850                         return;
 851                 }
 852                 jiov[0].iov_base = __DECONST(char *, "jid");
 853                 jiov[0].iov_len = sizeof("jid");
 854                 jiov[1].iov_base = &jid;
 855                 jiov[1].iov_len = sizeof(jid);
 856         } else if ((pval = string_param(j->intparams[KP_NAME]))) {
 857                 jiov[0].iov_base = __DECONST(char *, "name");
 858                 jiov[0].iov_len = sizeof("name");
 859                 jiov[1].iov_len = strlen(pval) + 1;
 860                 jiov[1].iov_base = alloca(jiov[1].iov_len);
 861                 strcpy(jiov[1].iov_base, pval);
 862         } else {
 863                 j->jid = -1;
 864                 return;
 865         }
 866         j->jid = jail_get(jiov, 2, dflag ? JAIL_DYING : 0);
 867 }
 868
 869 static void
 870 jail_quoted_warnx(const struct cfjail *j, const char *name_msg,
 871     const char *noname_msg)
 872 {
 873         const char *pval;
 874
 875         if ((pval = j->name) || (pval = string_param(j->intparams[KP_JID])) ||
 876             (pval = string_param(j->intparams[KP_NAME])))
 877                 warnx("\"%s\" %s", pval, name_msg);
 878         else
 879                 warnx("%s", noname_msg);
 880 }
 881
 882 /*
 883  * Set jail parameters and possibly print them out.
 884  */
 885 static int
 886 jailparam_set_note(const struct cfjail *j, struct jailparam *jp, unsigned njp,
 887     int flags)
 888 {
 889         char *value;
 890         int jid;
 891         unsigned i;
 892
 893         jid = jailparam_set(jp, njp, flags);
 894         if (verbose > 0) {
 895                 jail_note(j, "jail_set(%s%s)",
 896                     (flags & (JAIL_CREATE | JAIL_UPDATE)) == JAIL_CREATE
 897                     ? "JAIL_CREATE" : "JAIL_UPDATE",
 898                     (flags & JAIL_DYING) ? " | JAIL_DYING" : "");
 899                 for (i = 0; i < njp; i++) {
 900                         printf(" %s", jp[i].jp_name);
 901                         if (jp[i].jp_value == NULL)
 902                                 continue;
 903                         putchar('=');
 904                         value = jailparam_export(jp + i);
 905                         if (value == NULL)
 906                                 err(1, "jailparam_export");
 907                         quoted_print(stdout, value);
 908                         free(value);
 909                 }
 910                 if (jid < 0)
 911                         printf(": %s", strerror(errno));
 912                 printf("\n");
 913         }
 914         return jid;
 915 }
 916
 917 /*
 918  * Print a jail record.
 919  */
 920 static void
 921 print_jail(FILE *fp, struct cfjail *j, int oldcl)
 922 {
 923         struct cfparam *p;
 924
 925         if (oldcl) {
 926                 fprintf(fp, "%d\t", j->jid);
 927                 print_param(fp, j->intparams[KP_PATH], ',', 0);
 928                 putc('\t', fp);
 929                 print_param(fp, j->intparams[KP_HOST_HOSTNAME], ',', 0);
 930                 putc('\t', fp);
 931 #ifdef INET
 932                 print_param(fp, j->intparams[KP_IP4_ADDR], ',', 0);
 933 #ifdef INET6
 934                 if (j->intparams[KP_IP4_ADDR] &&
 935                     !TAILQ_EMPTY(&j->intparams[KP_IP4_ADDR]->val) &&
 936                     j->intparams[KP_IP6_ADDR] &&
 937                     !TAILQ_EMPTY(&j->intparams[KP_IP6_ADDR]->val))
 938                     putc(',', fp);
 939 #endif
 940 #endif
 941 #ifdef INET6
 942                 print_param(fp, j->intparams[KP_IP6_ADDR], ',', 0);
 943 #endif
 944                 putc('\t', fp);
 945                 print_param(fp, j->intparams[IP_COMMAND], ' ', 0);
 946         } else {
 947                 fprintf(fp, "jid=%d", j->jid);
 948                 TAILQ_FOREACH(p, &j->params, tq)
 949                         if (strcmp(p->name, "jid")) {
 950                                 putc(' ', fp);
 951                                 print_param(fp, p, ',', 1);
 952                         }
 953         }
 954         putc('\n', fp);
 955 }
 956
 957 /*
 958  * Print a parameter value, or a name=value pair.
 959  */
 960 static void
 961 print_param(FILE *fp, const struct cfparam *p, int sep, int doname)
 962 {
 963         const struct cfstring *s, *ts;
 964
 965         if (doname)
 966                 fputs(p->name, fp);
 967         if (p == NULL || TAILQ_EMPTY(&p->val))
 968                 return;
 969         if (doname)
 970                 putc('=', fp);
 971         TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
 972                 quoted_print(fp, s->s);
 973                 if (ts != NULL)
 974                         putc(sep, fp);
 975         }
 976 }
 977
 978 /*
 979  * Print a string with quotes around spaces.
 980  */
 981 static void
 982 quoted_print(FILE *fp, char *str)
 983 {
 984         int c, qc;
 985         char *p = str;
 986
 987         qc = !*p ? '"'
 988             : strchr(p, '\'') ? '"'
 989             : strchr(p, '"') ? '\''
 990             : strchr(p, ' ') || strchr(p, '\t') ? '"'
 991             : 0;
 992         if (qc)
 993                 putc(qc, fp);
 994         while ((c = *p++)) {
 995                 if (c == '\\' || c == qc)
 996                         putc('\\', fp);
 997                 putc(c, fp);
 998         }
 999         if (qc)
1000                 putc(qc, fp);
1001 }
1002
1003 static void
1004 usage(void)
1005 {
1006
1007         (void)fprintf(stderr,
1008             "usage: jail [-dhilqv] [-J jid_file] [-u username] [-U username]\n"
1009             "            -[cmr] param=value ... [command=command ...]\n"
1010             "       jail [-dqv] [-f file] -[cmr] [jail]\n"
1011             "       jail [-qv] [-f file] -[rR] ['*' | jail ...]\n"
1012             "       jail [-dhilqv] [-J jid_file] [-u username] [-U username]\n"
1013             "            [-n jailname] [-s securelevel]\n"
1014             "            path hostname [ip[,...]] command ...\n");
1015         exit(1);
1016 }