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