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/event.h> 32 #include <sys/mount.h> 33 #include <sys/stat.h> 34 #include <sys/sysctl.h> 35 #include <sys/user.h> 36 #include <sys/wait.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <kvm.h> 42 #include <login_cap.h> 43 #include <paths.h> 44 #include <pwd.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <vis.h> 51 52 #include "jailp.h" 53 54 #define DEFAULT_STOP_TIMEOUT 10 55 #define PHASH_SIZE 256 56 57 LIST_HEAD(phhead, phash); 58 59 struct phash { 60 LIST_ENTRY(phash) le; 61 struct cfjail *j; 62 pid_t pid; 63 }; 64 65 int paralimit = -1; 66 67 extern char **environ; 68 69 static int run_command(struct cfjail *j); 70 static int add_proc(struct cfjail *j, pid_t pid); 71 static void clear_procs(struct cfjail *j); 72 static struct cfjail *find_proc(pid_t pid); 73 static int term_procs(struct cfjail *j); 74 static int get_user_info(struct cfjail *j, const char *username, 75 const struct passwd **pwdp, login_cap_t **lcapp); 76 static int check_path(struct cfjail *j, const char *pname, const char *path, 77 int isfile, const char *umount_type); 78 79 static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 80 static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 81 static struct cfstring dummystring = { .len = 1 }; 82 static struct phhead phash[PHASH_SIZE]; 83 static int kq; 84 85 /* 86 * Run the next command associated with a jail. 87 */ 88 int 89 next_command(struct cfjail *j) 90 { 91 enum intparam comparam; 92 int create_failed, stopping; 93 94 if (paralimit == 0) { 95 if (j->flags & JF_FROM_RUNQ) 96 requeue_head(j, &runnable); 97 else 98 requeue(j, &runnable); 99 return 1; 100 } 101 j->flags &= ~JF_FROM_RUNQ; 102 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 103 stopping = (j->flags & JF_STOP) != 0; 104 comparam = *j->comparam; 105 for (;;) { 106 if (j->comstring == NULL) { 107 j->comparam += create_failed ? -1 : 1; 108 switch ((comparam = *j->comparam)) { 109 case IP__NULL: 110 return 0; 111 case IP_MOUNT_DEVFS: 112 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 113 continue; 114 j->comstring = &dummystring; 115 break; 116 case IP_MOUNT_FDESCFS: 117 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 118 continue; 119 j->comstring = &dummystring; 120 break; 121 case IP_MOUNT_PROCFS: 122 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 123 continue; 124 j->comstring = &dummystring; 125 break; 126 case IP__OP: 127 case IP_STOP_TIMEOUT: 128 j->comstring = &dummystring; 129 break; 130 default: 131 if (j->intparams[comparam] == NULL) 132 continue; 133 j->comstring = create_failed || (stopping && 134 (j->intparams[comparam]->flags & PF_REV)) 135 ? TAILQ_LAST(&j->intparams[comparam]->val, 136 cfstrings) 137 : TAILQ_FIRST(&j->intparams[comparam]->val); 138 } 139 } else { 140 j->comstring = j->comstring == &dummystring ? NULL : 141 create_failed || (stopping && 142 (j->intparams[comparam]->flags & PF_REV)) 143 ? TAILQ_PREV(j->comstring, cfstrings, tq) 144 : TAILQ_NEXT(j->comstring, tq); 145 } 146 if (j->comstring == NULL || j->comstring->len == 0 || 147 (create_failed && (comparam == IP_EXEC_PRESTART || 148 comparam == IP_EXEC_START || comparam == IP_COMMAND || 149 comparam == IP_EXEC_POSTSTART))) 150 continue; 151 switch (run_command(j)) { 152 case -1: 153 failed(j); 154 /* FALLTHROUGH */ 155 case 1: 156 return 1; 157 } 158 } 159 } 160 161 /* 162 * Check command exit status 163 */ 164 int 165 finish_command(struct cfjail *j) 166 { 167 struct cfjail *rj; 168 int error; 169 170 if (!(j->flags & JF_SLEEPQ)) 171 return 0; 172 j->flags &= ~JF_SLEEPQ; 173 if (*j->comparam == IP_STOP_TIMEOUT) { 174 j->flags &= ~JF_TIMEOUT; 175 j->pstatus = 0; 176 return 0; 177 } 178 paralimit++; 179 if (!TAILQ_EMPTY(&runnable)) { 180 rj = TAILQ_FIRST(&runnable); 181 rj->flags |= JF_FROM_RUNQ; 182 requeue(rj, &ready); 183 } 184 error = 0; 185 if (j->flags & JF_TIMEOUT) { 186 j->flags &= ~JF_TIMEOUT; 187 if (*j->comparam != IP_STOP_TIMEOUT) { 188 jail_warnx(j, "%s: timed out", j->comline); 189 failed(j); 190 error = -1; 191 } else if (verbose > 0) 192 jail_note(j, "timed out\n"); 193 } else if (j->pstatus != 0) { 194 if (WIFSIGNALED(j->pstatus)) 195 jail_warnx(j, "%s: exited on signal %d", 196 j->comline, WTERMSIG(j->pstatus)); 197 else 198 jail_warnx(j, "%s: failed", j->comline); 199 j->pstatus = 0; 200 failed(j); 201 error = -1; 202 } 203 free(j->comline); 204 j->comline = NULL; 205 return error; 206 } 207 208 /* 209 * Check for finished processes or timeouts. 210 */ 211 struct cfjail * 212 next_proc(int nonblock) 213 { 214 struct kevent ke; 215 struct timespec ts; 216 struct timespec *tsp; 217 struct cfjail *j; 218 219 if (!TAILQ_EMPTY(&sleeping)) { 220 again: 221 tsp = NULL; 222 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 223 clock_gettime(CLOCK_REALTIME, &ts); 224 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 225 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 226 if (ts.tv_nsec < 0) { 227 ts.tv_sec--; 228 ts.tv_nsec += 1000000000; 229 } 230 if (ts.tv_sec < 0 || 231 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 232 j->flags |= JF_TIMEOUT; 233 clear_procs(j); 234 return j; 235 } 236 tsp = &ts; 237 } 238 if (nonblock) { 239 ts.tv_sec = 0; 240 ts.tv_nsec = 0; 241 tsp = &ts; 242 } 243 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 244 case -1: 245 if (errno != EINTR) 246 err(1, "kevent"); 247 goto again; 248 case 0: 249 if (!nonblock) { 250 j = TAILQ_FIRST(&sleeping); 251 j->flags |= JF_TIMEOUT; 252 clear_procs(j); 253 return j; 254 } 255 break; 256 case 1: 257 (void)waitpid(ke.ident, NULL, WNOHANG); 258 if ((j = find_proc(ke.ident))) { 259 j->pstatus = ke.data; 260 return j; 261 } 262 goto again; 263 } 264 } 265 return NULL; 266 } 267 268 /* 269 * Run a single command for a jail, possibly inside the jail. 270 */ 271 static int 272 run_command(struct cfjail *j) 273 { 274 const struct passwd *pwd; 275 const struct cfstring *comstring, *s; 276 login_cap_t *lcap; 277 const char **argv; 278 char *acs, *cs, *comcs, *devpath; 279 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 280 enum intparam comparam; 281 size_t comlen; 282 pid_t pid; 283 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 284 #if defined(INET) || defined(INET6) 285 char *addr, *extrap, *p, *val; 286 #endif 287 288 static char *cleanenv; 289 290 /* Perform some operations that aren't actually commands */ 291 comparam = *j->comparam; 292 down = j->flags & (JF_STOP | JF_FAILED); 293 switch (comparam) { 294 case IP_STOP_TIMEOUT: 295 return term_procs(j); 296 297 case IP__OP: 298 if (down) { 299 if (jail_remove(j->jid) < 0 && errno == EPERM) { 300 jail_warnx(j, "jail_remove: %s", 301 strerror(errno)); 302 return -1; 303 } 304 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 305 ? note_remove : j->name != NULL))) 306 jail_note(j, "removed\n"); 307 j->jid = -1; 308 if (j->flags & JF_STOP) 309 dep_done(j, DF_LIGHT); 310 else 311 j->flags &= ~JF_PERSIST; 312 } else { 313 if (create_jail(j) < 0) 314 return -1; 315 if (iflag) 316 printf("%d\n", j->jid); 317 if (verbose >= 0 && (j->name || verbose > 0)) 318 jail_note(j, "created\n"); 319 dep_done(j, DF_LIGHT); 320 } 321 return 0; 322 323 default: ; 324 } 325 /* 326 * Collect exec arguments. Internal commands for network and 327 * mounting build their own argument lists. 328 */ 329 comstring = j->comstring; 330 bg = 0; 331 switch (comparam) { 332 #ifdef INET 333 case IP__IP4_IFADDR: 334 argc = 0; 335 val = alloca(strlen(comstring->s) + 1); 336 strcpy(val, comstring->s); 337 cs = val; 338 extrap = NULL; 339 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 340 if (extrap == NULL) { 341 *p = '\0'; 342 extrap = p + 1; 343 } 344 cs = p + 1; 345 argc++; 346 } 347 348 argv = alloca((8 + argc) * sizeof(char *)); 349 argv[0] = _PATH_IFCONFIG; 350 if ((cs = strchr(val, '|'))) { 351 argv[1] = acs = alloca(cs - val + 1); 352 strlcpy(acs, val, cs - val + 1); 353 addr = cs + 1; 354 } else { 355 argv[1] = string_param(j->intparams[IP_INTERFACE]); 356 addr = val; 357 } 358 argv[2] = "inet"; 359 if (!(cs = strchr(addr, '/'))) { 360 argv[3] = addr; 361 argv[4] = "netmask"; 362 argv[5] = "255.255.255.255"; 363 argc = 6; 364 } else if (strchr(cs + 1, '.')) { 365 argv[3] = acs = alloca(cs - addr + 1); 366 strlcpy(acs, addr, cs - addr + 1); 367 argv[4] = "netmask"; 368 argv[5] = cs + 1; 369 argc = 6; 370 } else { 371 argv[3] = addr; 372 argc = 4; 373 } 374 375 if (!down) { 376 for (cs = strtok(extrap, " "); cs; 377 cs = strtok(NULL, " ")) { 378 size_t len = strlen(cs) + 1; 379 argv[argc++] = acs = alloca(len); 380 strlcpy(acs, cs, len); 381 } 382 } 383 384 argv[argc] = down ? "-alias" : "alias"; 385 argv[argc + 1] = NULL; 386 break; 387 #endif 388 389 #ifdef INET6 390 case IP__IP6_IFADDR: 391 argc = 0; 392 val = alloca(strlen(comstring->s) + 1); 393 strcpy(val, comstring->s); 394 cs = val; 395 extrap = NULL; 396 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 397 if (extrap == NULL) { 398 *p = '\0'; 399 extrap = p + 1; 400 } 401 cs = p + 1; 402 argc++; 403 } 404 405 argv = alloca((8 + argc) * sizeof(char *)); 406 argv[0] = _PATH_IFCONFIG; 407 if ((cs = strchr(val, '|'))) { 408 argv[1] = acs = alloca(cs - val + 1); 409 strlcpy(acs, val, cs - val + 1); 410 addr = cs + 1; 411 } else { 412 argv[1] = string_param(j->intparams[IP_INTERFACE]); 413 addr = val; 414 } 415 argv[2] = "inet6"; 416 argv[3] = addr; 417 if (!(cs = strchr(addr, '/'))) { 418 argv[4] = "prefixlen"; 419 argv[5] = "128"; 420 argc = 6; 421 } else 422 argc = 4; 423 424 if (!down) { 425 for (cs = strtok(extrap, " "); cs; 426 cs = strtok(NULL, " ")) { 427 size_t len = strlen(cs) + 1; 428 argv[argc++] = acs = alloca(len); 429 strlcpy(acs, cs, len); 430 } 431 } 432 433 argv[argc] = down ? "-alias" : "alias"; 434 argv[argc + 1] = NULL; 435 break; 436 #endif 437 438 case IP_VNET_INTERFACE: 439 argv = alloca(5 * sizeof(char *)); 440 argv[0] = _PATH_IFCONFIG; 441 argv[1] = comstring->s; 442 argv[2] = down ? "-vnet" : "vnet"; 443 jidstr = string_param(j->intparams[KP_JID]); 444 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 445 argv[4] = NULL; 446 break; 447 448 case IP_MOUNT: 449 case IP__MOUNT_FROM_FSTAB: 450 argv = alloca(8 * sizeof(char *)); 451 comcs = alloca(comstring->len + 1); 452 strcpy(comcs, comstring->s); 453 argc = 0; 454 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 455 cs = strtok(NULL, " \t\f\v\r\n")) { 456 if (argc <= 1 && strunvis(cs, cs) < 0) { 457 jail_warnx(j, "%s: %s: fstab parse error", 458 j->intparams[comparam]->name, comstring->s); 459 return -1; 460 } 461 argv[argc++] = cs; 462 } 463 if (argc == 0) 464 return 0; 465 if (argc < 3) { 466 jail_warnx(j, "%s: %s: missing information", 467 j->intparams[comparam]->name, comstring->s); 468 return -1; 469 } 470 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 471 down ? argv[2] : NULL) < 0) 472 return -1; 473 if (down) { 474 argv[4] = NULL; 475 argv[3] = argv[1]; 476 argv[0] = "/sbin/umount"; 477 } else { 478 if (argc == 4) { 479 argv[7] = NULL; 480 argv[6] = argv[1]; 481 argv[5] = argv[0]; 482 argv[4] = argv[3]; 483 argv[3] = "-o"; 484 } else { 485 argv[5] = NULL; 486 argv[4] = argv[1]; 487 argv[3] = argv[0]; 488 } 489 argv[0] = _PATH_MOUNT; 490 } 491 argv[1] = "-t"; 492 break; 493 494 case IP_MOUNT_DEVFS: 495 argv = alloca(7 * sizeof(char *)); 496 path = string_param(j->intparams[KP_PATH]); 497 if (path == NULL) { 498 jail_warnx(j, "mount.devfs: no path"); 499 return -1; 500 } 501 devpath = alloca(strlen(path) + 5); 502 sprintf(devpath, "%s/dev", path); 503 if (check_path(j, "mount.devfs", devpath, 0, 504 down ? "devfs" : NULL) < 0) 505 return -1; 506 if (down) { 507 argv[0] = "/sbin/umount"; 508 argv[1] = devpath; 509 argv[2] = NULL; 510 } else { 511 argv[0] = _PATH_MOUNT; 512 argv[1] = "-t"; 513 argv[2] = "devfs"; 514 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 515 if (!ruleset) 516 ruleset = "4"; /* devfsrules_jail */ 517 argv[3] = acs = alloca(11 + strlen(ruleset)); 518 sprintf(acs, "-oruleset=%s", ruleset); 519 argv[4] = "."; 520 argv[5] = devpath; 521 argv[6] = NULL; 522 } 523 break; 524 525 case IP_MOUNT_FDESCFS: 526 argv = alloca(7 * sizeof(char *)); 527 path = string_param(j->intparams[KP_PATH]); 528 if (path == NULL) { 529 jail_warnx(j, "mount.fdescfs: no path"); 530 return -1; 531 } 532 devpath = alloca(strlen(path) + 8); 533 sprintf(devpath, "%s/dev/fd", path); 534 if (check_path(j, "mount.fdescfs", devpath, 0, 535 down ? "fdescfs" : NULL) < 0) 536 return -1; 537 if (down) { 538 argv[0] = "/sbin/umount"; 539 argv[1] = devpath; 540 argv[2] = NULL; 541 } else { 542 argv[0] = _PATH_MOUNT; 543 argv[1] = "-t"; 544 argv[2] = "fdescfs"; 545 argv[3] = "."; 546 argv[4] = devpath; 547 argv[5] = NULL; 548 } 549 break; 550 551 case IP_MOUNT_PROCFS: 552 argv = alloca(7 * sizeof(char *)); 553 path = string_param(j->intparams[KP_PATH]); 554 if (path == NULL) { 555 jail_warnx(j, "mount.procfs: no path"); 556 return -1; 557 } 558 devpath = alloca(strlen(path) + 6); 559 sprintf(devpath, "%s/proc", path); 560 if (check_path(j, "mount.procfs", devpath, 0, 561 down ? "procfs" : NULL) < 0) 562 return -1; 563 if (down) { 564 argv[0] = "/sbin/umount"; 565 argv[1] = devpath; 566 argv[2] = NULL; 567 } else { 568 argv[0] = _PATH_MOUNT; 569 argv[1] = "-t"; 570 argv[2] = "procfs"; 571 argv[3] = "."; 572 argv[4] = devpath; 573 argv[5] = NULL; 574 } 575 break; 576 577 case IP_COMMAND: 578 if (j->name != NULL) 579 goto default_command; 580 argc = 0; 581 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 582 argc++; 583 argv = alloca((argc + 1) * sizeof(char *)); 584 argc = 0; 585 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 586 argv[argc++] = s->s; 587 argv[argc] = NULL; 588 j->comstring = &dummystring; 589 break; 590 591 default: 592 default_command: 593 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 594 !(cs[0] == '&' && cs[1] == '\0')) { 595 argv = alloca(4 * sizeof(char *)); 596 argv[0] = _PATH_BSHELL; 597 argv[1] = "-c"; 598 argv[2] = comstring->s; 599 argv[3] = NULL; 600 } else { 601 if (cs) { 602 *cs = 0; 603 bg = 1; 604 } 605 comcs = alloca(comstring->len + 1); 606 strcpy(comcs, comstring->s); 607 argc = 0; 608 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 609 cs = strtok(NULL, " \t\f\v\r\n")) 610 argc++; 611 argv = alloca((argc + 1) * sizeof(char *)); 612 strcpy(comcs, comstring->s); 613 argc = 0; 614 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 615 cs = strtok(NULL, " \t\f\v\r\n")) 616 argv[argc++] = cs; 617 argv[argc] = NULL; 618 } 619 } 620 if (argv[0] == NULL) 621 return 0; 622 623 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 624 timeout != 0) { 625 clock_gettime(CLOCK_REALTIME, &j->timeout); 626 j->timeout.tv_sec += timeout; 627 } else 628 j->timeout.tv_sec = 0; 629 630 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 631 comparam == IP_EXEC_STOP; 632 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 633 username = string_param(j->intparams[injail 634 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 635 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 636 637 consfd = 0; 638 if (injail && 639 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 640 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 641 return -1; 642 consfd = 643 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 644 if (consfd < 0) { 645 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 646 return -1; 647 } 648 } 649 650 comlen = 0; 651 for (i = 0; argv[i]; i++) 652 comlen += strlen(argv[i]) + 1; 653 j->comline = cs = emalloc(comlen); 654 for (i = 0; argv[i]; i++) { 655 strcpy(cs, argv[i]); 656 if (argv[i + 1]) { 657 cs += strlen(argv[i]) + 1; 658 cs[-1] = ' '; 659 } 660 } 661 if (verbose > 0) 662 jail_note(j, "run command%s%s%s: %s\n", 663 injail ? " in jail" : "", username ? " as " : "", 664 username ? username : "", j->comline); 665 666 pid = fork(); 667 if (pid < 0) 668 err(1, "fork"); 669 if (pid > 0) { 670 if (bg || !add_proc(j, pid)) { 671 free(j->comline); 672 j->comline = NULL; 673 return 0; 674 } else { 675 paralimit--; 676 return 1; 677 } 678 } 679 if (bg) 680 setsid(); 681 682 /* Set up the environment and run the command */ 683 pwd = NULL; 684 lcap = NULL; 685 if ((clean || username) && injail && sjuser && 686 get_user_info(j, username, &pwd, &lcap) < 0) 687 exit(1); 688 if (injail) { 689 /* jail_attach won't chdir along with its chroot. */ 690 path = string_param(j->intparams[KP_PATH]); 691 if (path && chdir(path) < 0) { 692 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 693 exit(1); 694 } 695 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 696 setfib(fib) < 0) { 697 jail_warnx(j, "setfib: %s", strerror(errno)); 698 exit(1); 699 } 700 if (jail_attach(j->jid) < 0) { 701 jail_warnx(j, "jail_attach: %s", strerror(errno)); 702 exit(1); 703 } 704 } 705 if (clean || username) { 706 if (!(injail && sjuser) && 707 get_user_info(j, username, &pwd, &lcap) < 0) 708 exit(1); 709 if (clean) { 710 term = getenv("TERM"); 711 environ = &cleanenv; 712 setenv("PATH", "/bin:/usr/bin", 0); 713 if (term != NULL) 714 setenv("TERM", term, 1); 715 } 716 if (setgid(pwd->pw_gid) < 0) { 717 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 718 strerror(errno)); 719 exit(1); 720 } 721 if (setusercontext(lcap, pwd, pwd->pw_uid, username 722 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 723 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 724 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 725 strerror(errno)); 726 exit(1); 727 } 728 login_close(lcap); 729 setenv("USER", pwd->pw_name, 1); 730 setenv("HOME", pwd->pw_dir, 1); 731 setenv("SHELL", 732 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 733 if (clean && chdir(pwd->pw_dir) < 0) { 734 jail_warnx(j, "chdir %s: %s", 735 pwd->pw_dir, strerror(errno)); 736 exit(1); 737 } 738 endpwent(); 739 } 740 741 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 742 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 743 exit(1); 744 } 745 closefrom(3); 746 execvp(argv[0], __DECONST(char *const*, argv)); 747 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 748 exit(1); 749 } 750 751 /* 752 * Add a process to the hash, tied to a jail. 753 */ 754 static int 755 add_proc(struct cfjail *j, pid_t pid) 756 { 757 struct kevent ke; 758 struct cfjail *tj; 759 struct phash *ph; 760 761 if (!kq && (kq = kqueue()) < 0) 762 err(1, "kqueue"); 763 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 764 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 765 if (errno == ESRCH) 766 return 0; 767 err(1, "kevent"); 768 } 769 ph = emalloc(sizeof(struct phash)); 770 ph->j = j; 771 ph->pid = pid; 772 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 773 j->nprocs++; 774 j->flags |= JF_SLEEPQ; 775 if (j->timeout.tv_sec == 0) 776 requeue(j, &sleeping); 777 else { 778 /* File the jail in the sleep queue according to its timeout. */ 779 TAILQ_REMOVE(j->queue, j, tq); 780 TAILQ_FOREACH(tj, &sleeping, tq) { 781 if (!tj->timeout.tv_sec || 782 j->timeout.tv_sec < tj->timeout.tv_sec || 783 (j->timeout.tv_sec == tj->timeout.tv_sec && 784 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 785 TAILQ_INSERT_BEFORE(tj, j, tq); 786 break; 787 } 788 } 789 if (tj == NULL) 790 TAILQ_INSERT_TAIL(&sleeping, j, tq); 791 j->queue = &sleeping; 792 } 793 return 1; 794 } 795 796 /* 797 * Remove any processes from the hash that correspond to a jail. 798 */ 799 static void 800 clear_procs(struct cfjail *j) 801 { 802 struct kevent ke; 803 struct phash *ph, *tph; 804 int i; 805 806 j->nprocs = 0; 807 for (i = 0; i < PHASH_SIZE; i++) 808 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 809 if (ph->j == j) { 810 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 811 NOTE_EXIT, 0, NULL); 812 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 813 LIST_REMOVE(ph, le); 814 free(ph); 815 } 816 } 817 818 /* 819 * Find the jail that corresponds to an exited process. 820 */ 821 static struct cfjail * 822 find_proc(pid_t pid) 823 { 824 struct cfjail *j; 825 struct phash *ph; 826 827 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 828 if (ph->pid == pid) { 829 j = ph->j; 830 LIST_REMOVE(ph, le); 831 free(ph); 832 return --j->nprocs ? NULL : j; 833 } 834 return NULL; 835 } 836 837 /* 838 * Send SIGTERM to all processes in a jail and wait for them to die. 839 */ 840 static int 841 term_procs(struct cfjail *j) 842 { 843 struct kinfo_proc *ki; 844 int i, noted, pcnt, timeout; 845 846 static kvm_t *kd; 847 848 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 849 timeout = DEFAULT_STOP_TIMEOUT; 850 else if (timeout == 0) 851 return 0; 852 853 if (kd == NULL) { 854 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 855 if (kd == NULL) 856 return 0; 857 } 858 859 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 860 if (ki == NULL) 861 return 0; 862 noted = 0; 863 for (i = 0; i < pcnt; i++) 864 if (ki[i].ki_jid == j->jid && 865 kill(ki[i].ki_pid, SIGTERM) == 0) { 866 (void)add_proc(j, ki[i].ki_pid); 867 if (verbose > 0) { 868 if (!noted) { 869 noted = 1; 870 jail_note(j, "sent SIGTERM to:"); 871 } 872 printf(" %d", ki[i].ki_pid); 873 } 874 } 875 if (noted) 876 printf("\n"); 877 if (j->nprocs > 0) { 878 clock_gettime(CLOCK_REALTIME, &j->timeout); 879 j->timeout.tv_sec += timeout; 880 return 1; 881 } 882 return 0; 883 } 884 885 /* 886 * Look up a user in the passwd and login.conf files. 887 */ 888 static int 889 get_user_info(struct cfjail *j, const char *username, 890 const struct passwd **pwdp, login_cap_t **lcapp) 891 { 892 const struct passwd *pwd; 893 894 errno = 0; 895 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 896 if (pwd == NULL) { 897 if (errno) 898 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 899 username ? username : "", strerror(errno)); 900 else if (username) 901 jail_warnx(j, "%s: no such user", username); 902 else 903 jail_warnx(j, "unknown uid %d", getuid()); 904 return -1; 905 } 906 *lcapp = login_getpwclass(pwd); 907 if (*lcapp == NULL) { 908 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 909 strerror(errno)); 910 return -1; 911 } 912 /* Set the groups while the group file is still available */ 913 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 914 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 915 strerror(errno)); 916 return -1; 917 } 918 return 0; 919 } 920 921 /* 922 * Make sure a mount or consolelog path is a valid absolute pathname 923 * with no symlinks. 924 */ 925 static int 926 check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 927 const char *umount_type) 928 { 929 struct stat st, mpst; 930 struct statfs stfs; 931 char *tpath, *p; 932 const char *jailpath; 933 size_t jplen; 934 935 if (path[0] != '/') { 936 jail_warnx(j, "%s: %s: not an absolute pathname", 937 pname, path); 938 return -1; 939 } 940 /* 941 * Only check for symlinks in components below the jail's path, 942 * since that's where the security risk lies. 943 */ 944 jailpath = string_param(j->intparams[KP_PATH]); 945 if (jailpath == NULL) 946 jailpath = ""; 947 jplen = strlen(jailpath); 948 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 949 tpath = alloca(strlen(path) + 1); 950 strcpy(tpath, path); 951 for (p = tpath + jplen; p != NULL; ) { 952 p = strchr(p + 1, '/'); 953 if (p) 954 *p = '\0'; 955 if (lstat(tpath, &st) < 0) { 956 if (errno == ENOENT && isfile && !p) 957 break; 958 jail_warnx(j, "%s: %s: %s", pname, tpath, 959 strerror(errno)); 960 return -1; 961 } 962 if (S_ISLNK(st.st_mode)) { 963 jail_warnx(j, "%s: %s is a symbolic link", 964 pname, tpath); 965 return -1; 966 } 967 if (p) 968 *p = '/'; 969 } 970 } 971 if (umount_type != NULL) { 972 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 973 jail_warnx(j, "%s: %s: %s", pname, path, 974 strerror(errno)); 975 return -1; 976 } 977 if (stat(stfs.f_mntonname, &mpst) < 0) { 978 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 979 strerror(errno)); 980 return -1; 981 } 982 if (st.st_ino != mpst.st_ino) { 983 jail_warnx(j, "%s: %s: not a mount point", 984 pname, path); 985 return -1; 986 } 987 if (strcmp(stfs.f_fstypename, umount_type)) { 988 jail_warnx(j, "%s: %s: not a %s mount", 989 pname, path, umount_type); 990 return -1; 991 } 992 } 993 return 0; 994 } 995