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