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