usr.sbin/jail/jail.c

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