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 char **argv; 264 char *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 *(const char **)&argv[0] = _PATH_IFCONFIG; 336 if ((cs = strchr(val, '|'))) { 337 argv[1] = alloca(cs - val + 1); 338 strlcpy(argv[1], val, cs - val + 1); 339 addr = cs + 1; 340 } else { 341 *(const char **)&argv[1] = 342 string_param(j->intparams[IP_INTERFACE]); 343 addr = val; 344 } 345 *(const char **)&argv[2] = "inet"; 346 if (!(cs = strchr(addr, '/'))) { 347 argv[3] = addr; 348 *(const char **)&argv[4] = "netmask"; 349 *(const char **)&argv[5] = "255.255.255.255"; 350 argc = 6; 351 } else if (strchr(cs + 1, '.')) { 352 argv[3] = alloca(cs - addr + 1); 353 strlcpy(argv[3], addr, cs - addr + 1); 354 *(const char **)&argv[4] = "netmask"; 355 *(const char **)&argv[5] = cs + 1; 356 argc = 6; 357 } else { 358 argv[3] = addr; 359 argc = 4; 360 } 361 362 if (!down) { 363 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 364 size_t len = strlen(cs) + 1; 365 argv[argc] = alloca(len); 366 strlcpy(argv[argc++], cs, len); 367 } 368 } 369 370 *(const char **)&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 *(const char **)&argv[0] = _PATH_IFCONFIG; 393 if ((cs = strchr(val, '|'))) { 394 argv[1] = alloca(cs - val + 1); 395 strlcpy(argv[1], val, cs - val + 1); 396 addr = cs + 1; 397 } else { 398 *(const char **)&argv[1] = 399 string_param(j->intparams[IP_INTERFACE]); 400 addr = val; 401 } 402 *(const char **)&argv[2] = "inet6"; 403 argv[3] = addr; 404 if (!(cs = strchr(addr, '/'))) { 405 *(const char **)&argv[4] = "prefixlen"; 406 *(const char **)&argv[5] = "128"; 407 argc = 6; 408 } else 409 argc = 4; 410 411 if (!down) { 412 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 413 size_t len = strlen(cs) + 1; 414 argv[argc] = alloca(len); 415 strlcpy(argv[argc++], cs, len); 416 } 417 } 418 419 *(const char **)&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 *(const char **)&argv[0] = _PATH_IFCONFIG; 427 argv[1] = comstring->s; 428 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 429 jidstr = string_param(j->intparams[KP_JID]); 430 *(const char **)&argv[3] = 431 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 432 argv[4] = NULL; 433 break; 434 435 case IP_MOUNT: 436 case IP__MOUNT_FROM_FSTAB: 437 argv = alloca(8 * sizeof(char *)); 438 comcs = alloca(comstring->len + 1); 439 strcpy(comcs, comstring->s); 440 argc = 0; 441 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 442 cs = strtok(NULL, " \t\f\v\r\n")) 443 argv[argc++] = cs; 444 if (argc == 0) 445 return 0; 446 if (argc < 3) { 447 jail_warnx(j, "%s: %s: missing information", 448 j->intparams[comparam]->name, comstring->s); 449 return -1; 450 } 451 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 452 down ? argv[2] : NULL) < 0) 453 return -1; 454 if (down) { 455 argv[4] = NULL; 456 argv[3] = argv[1]; 457 *(const char **)&argv[0] = "/sbin/umount"; 458 } else { 459 if (argc == 4) { 460 argv[7] = NULL; 461 argv[6] = argv[1]; 462 argv[5] = argv[0]; 463 argv[4] = argv[3]; 464 *(const char **)&argv[3] = "-o"; 465 } else { 466 argv[5] = NULL; 467 argv[4] = argv[1]; 468 argv[3] = argv[0]; 469 } 470 *(const char **)&argv[0] = _PATH_MOUNT; 471 } 472 *(const char **)&argv[1] = "-t"; 473 break; 474 475 case IP_MOUNT_DEVFS: 476 argv = alloca(7 * sizeof(char *)); 477 path = string_param(j->intparams[KP_PATH]); 478 if (path == NULL) { 479 jail_warnx(j, "mount.devfs: no path"); 480 return -1; 481 } 482 devpath = alloca(strlen(path) + 5); 483 sprintf(devpath, "%s/dev", path); 484 if (check_path(j, "mount.devfs", devpath, 0, 485 down ? "devfs" : NULL) < 0) 486 return -1; 487 if (down) { 488 *(const char **)&argv[0] = "/sbin/umount"; 489 argv[1] = devpath; 490 argv[2] = NULL; 491 } else { 492 *(const char **)&argv[0] = _PATH_MOUNT; 493 *(const char **)&argv[1] = "-t"; 494 *(const char **)&argv[2] = "devfs"; 495 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 496 if (!ruleset) 497 ruleset = "4"; /* devfsrules_jail */ 498 argv[3] = alloca(11 + strlen(ruleset)); 499 sprintf(argv[3], "-oruleset=%s", ruleset); 500 *(const char **)&argv[4] = "."; 501 argv[5] = devpath; 502 argv[6] = NULL; 503 } 504 break; 505 506 case IP_MOUNT_FDESCFS: 507 argv = alloca(7 * sizeof(char *)); 508 path = string_param(j->intparams[KP_PATH]); 509 if (path == NULL) { 510 jail_warnx(j, "mount.fdescfs: no path"); 511 return -1; 512 } 513 devpath = alloca(strlen(path) + 8); 514 sprintf(devpath, "%s/dev/fd", path); 515 if (check_path(j, "mount.fdescfs", devpath, 0, 516 down ? "fdescfs" : NULL) < 0) 517 return -1; 518 if (down) { 519 *(const char **)&argv[0] = "/sbin/umount"; 520 argv[1] = devpath; 521 argv[2] = NULL; 522 } else { 523 *(const char **)&argv[0] = _PATH_MOUNT; 524 *(const char **)&argv[1] = "-t"; 525 *(const char **)&argv[2] = "fdescfs"; 526 *(const char **)&argv[3] = "."; 527 argv[4] = devpath; 528 argv[5] = NULL; 529 } 530 break; 531 532 case IP_COMMAND: 533 if (j->name != NULL) 534 goto default_command; 535 argc = 0; 536 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 537 argc++; 538 argv = alloca((argc + 1) * sizeof(char *)); 539 argc = 0; 540 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 541 argv[argc++] = s->s; 542 argv[argc] = NULL; 543 j->comstring = &dummystring; 544 break; 545 546 default: 547 default_command: 548 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 549 !(cs[0] == '&' && cs[1] == '\0')) { 550 argv = alloca(4 * sizeof(char *)); 551 *(const char **)&argv[0] = _PATH_BSHELL; 552 *(const char **)&argv[1] = "-c"; 553 argv[2] = comstring->s; 554 argv[3] = NULL; 555 } else { 556 if (cs) { 557 *cs = 0; 558 bg = 1; 559 } 560 comcs = alloca(comstring->len + 1); 561 strcpy(comcs, comstring->s); 562 argc = 0; 563 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 564 cs = strtok(NULL, " \t\f\v\r\n")) 565 argc++; 566 argv = alloca((argc + 1) * sizeof(char *)); 567 strcpy(comcs, comstring->s); 568 argc = 0; 569 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 570 cs = strtok(NULL, " \t\f\v\r\n")) 571 argv[argc++] = cs; 572 argv[argc] = NULL; 573 } 574 } 575 if (argv[0] == NULL) 576 return 0; 577 578 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 579 timeout != 0) { 580 clock_gettime(CLOCK_REALTIME, &j->timeout); 581 j->timeout.tv_sec += timeout; 582 } else 583 j->timeout.tv_sec = 0; 584 585 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 586 comparam == IP_EXEC_STOP; 587 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 588 username = string_param(j->intparams[injail 589 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 590 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 591 592 consfd = 0; 593 if (injail && 594 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 595 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 596 return -1; 597 consfd = 598 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 599 if (consfd < 0) { 600 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 601 return -1; 602 } 603 } 604 605 comlen = 0; 606 for (i = 0; argv[i]; i++) 607 comlen += strlen(argv[i]) + 1; 608 j->comline = cs = emalloc(comlen); 609 for (i = 0; argv[i]; i++) { 610 strcpy(cs, argv[i]); 611 if (argv[i + 1]) { 612 cs += strlen(argv[i]) + 1; 613 cs[-1] = ' '; 614 } 615 } 616 if (verbose > 0) 617 jail_note(j, "run command%s%s%s: %s\n", 618 injail ? " in jail" : "", username ? " as " : "", 619 username ? username : "", j->comline); 620 621 pid = fork(); 622 if (pid < 0) 623 err(1, "fork"); 624 if (pid > 0) { 625 if (bg || !add_proc(j, pid)) { 626 free(j->comline); 627 j->comline = NULL; 628 return 0; 629 } else { 630 paralimit--; 631 return 1; 632 } 633 } 634 if (bg) 635 setsid(); 636 637 /* Set up the environment and run the command */ 638 pwd = NULL; 639 lcap = NULL; 640 if ((clean || username) && injail && sjuser && 641 get_user_info(j, username, &pwd, &lcap) < 0) 642 exit(1); 643 if (injail) { 644 /* jail_attach won't chdir along with its chroot. */ 645 path = string_param(j->intparams[KP_PATH]); 646 if (path && chdir(path) < 0) { 647 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 648 exit(1); 649 } 650 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 651 setfib(fib) < 0) { 652 jail_warnx(j, "setfib: %s", strerror(errno)); 653 exit(1); 654 } 655 if (jail_attach(j->jid) < 0) { 656 jail_warnx(j, "jail_attach: %s", strerror(errno)); 657 exit(1); 658 } 659 } 660 if (clean || username) { 661 if (!(injail && sjuser) && 662 get_user_info(j, username, &pwd, &lcap) < 0) 663 exit(1); 664 if (clean) { 665 term = getenv("TERM"); 666 environ = &cleanenv; 667 setenv("PATH", "/bin:/usr/bin", 0); 668 if (term != NULL) 669 setenv("TERM", term, 1); 670 } 671 if (setusercontext(lcap, pwd, pwd->pw_uid, username 672 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 673 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 674 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 675 strerror(errno)); 676 exit(1); 677 } 678 login_close(lcap); 679 setenv("USER", pwd->pw_name, 1); 680 setenv("HOME", pwd->pw_dir, 1); 681 setenv("SHELL", 682 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 683 if (clean && chdir(pwd->pw_dir) < 0) { 684 jail_warnx(j, "chdir %s: %s", 685 pwd->pw_dir, strerror(errno)); 686 exit(1); 687 } 688 endpwent(); 689 } 690 691 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 692 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 693 exit(1); 694 } 695 closefrom(3); 696 execvp(argv[0], argv); 697 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 698 exit(1); 699 } 700 701 /* 702 * Add a process to the hash, tied to a jail. 703 */ 704 static int 705 add_proc(struct cfjail *j, pid_t pid) 706 { 707 struct kevent ke; 708 struct cfjail *tj; 709 struct phash *ph; 710 711 if (!kq && (kq = kqueue()) < 0) 712 err(1, "kqueue"); 713 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 714 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 715 if (errno == ESRCH) 716 return 0; 717 err(1, "kevent"); 718 } 719 ph = emalloc(sizeof(struct phash)); 720 ph->j = j; 721 ph->pid = pid; 722 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 723 j->nprocs++; 724 j->flags |= JF_SLEEPQ; 725 if (j->timeout.tv_sec == 0) 726 requeue(j, &sleeping); 727 else { 728 /* File the jail in the sleep queue acording to its timeout. */ 729 TAILQ_REMOVE(j->queue, j, tq); 730 TAILQ_FOREACH(tj, &sleeping, tq) { 731 if (!tj->timeout.tv_sec || 732 j->timeout.tv_sec < tj->timeout.tv_sec || 733 (j->timeout.tv_sec == tj->timeout.tv_sec && 734 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 735 TAILQ_INSERT_BEFORE(tj, j, tq); 736 break; 737 } 738 } 739 if (tj == NULL) 740 TAILQ_INSERT_TAIL(&sleeping, j, tq); 741 j->queue = &sleeping; 742 } 743 return 1; 744 } 745 746 /* 747 * Remove any processes from the hash that correspond to a jail. 748 */ 749 static void 750 clear_procs(struct cfjail *j) 751 { 752 struct kevent ke; 753 struct phash *ph, *tph; 754 int i; 755 756 j->nprocs = 0; 757 for (i = 0; i < PHASH_SIZE; i++) 758 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 759 if (ph->j == j) { 760 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 761 NOTE_EXIT, 0, NULL); 762 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 763 LIST_REMOVE(ph, le); 764 free(ph); 765 } 766 } 767 768 /* 769 * Find the jail that corresponds to an exited process. 770 */ 771 static struct cfjail * 772 find_proc(pid_t pid) 773 { 774 struct cfjail *j; 775 struct phash *ph; 776 777 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 778 if (ph->pid == pid) { 779 j = ph->j; 780 LIST_REMOVE(ph, le); 781 free(ph); 782 return --j->nprocs ? NULL : j; 783 } 784 return NULL; 785 } 786 787 /* 788 * Send SIGTERM to all processes in a jail and wait for them to die. 789 */ 790 static int 791 term_procs(struct cfjail *j) 792 { 793 struct kinfo_proc *ki; 794 int i, noted, pcnt, timeout; 795 796 static kvm_t *kd; 797 798 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 799 timeout = DEFAULT_STOP_TIMEOUT; 800 else if (timeout == 0) 801 return 0; 802 803 if (kd == NULL) { 804 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 805 if (kd == NULL) 806 return 0; 807 } 808 809 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 810 if (ki == NULL) 811 return 0; 812 noted = 0; 813 for (i = 0; i < pcnt; i++) 814 if (ki[i].ki_jid == j->jid && 815 kill(ki[i].ki_pid, SIGTERM) == 0) { 816 (void)add_proc(j, ki[i].ki_pid); 817 if (verbose > 0) { 818 if (!noted) { 819 noted = 1; 820 jail_note(j, "sent SIGTERM to:"); 821 } 822 printf(" %d", ki[i].ki_pid); 823 } 824 } 825 if (noted) 826 printf("\n"); 827 if (j->nprocs > 0) { 828 clock_gettime(CLOCK_REALTIME, &j->timeout); 829 j->timeout.tv_sec += timeout; 830 return 1; 831 } 832 return 0; 833 } 834 835 /* 836 * Look up a user in the passwd and login.conf files. 837 */ 838 static int 839 get_user_info(struct cfjail *j, const char *username, 840 const struct passwd **pwdp, login_cap_t **lcapp) 841 { 842 const struct passwd *pwd; 843 844 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 845 if (pwd == NULL) { 846 if (errno) 847 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 848 username ? username : "", strerror(errno)); 849 else if (username) 850 jail_warnx(j, "%s: no such user", username); 851 else 852 jail_warnx(j, "unknown uid %d", getuid()); 853 return -1; 854 } 855 *lcapp = login_getpwclass(pwd); 856 if (*lcapp == NULL) { 857 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 858 strerror(errno)); 859 return -1; 860 } 861 /* Set the groups while the group file is still available */ 862 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 863 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 864 strerror(errno)); 865 return -1; 866 } 867 return 0; 868 } 869 870 /* 871 * Make sure a mount or consolelog path is a valid absolute pathname 872 * with no symlinks. 873 */ 874 static int 875 check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 876 const char *umount_type) 877 { 878 struct stat st, mpst; 879 struct statfs stfs; 880 char *tpath, *p; 881 const char *jailpath; 882 size_t jplen; 883 884 if (path[0] != '/') { 885 jail_warnx(j, "%s: %s: not an absolute pathname", 886 pname, path); 887 return -1; 888 } 889 /* 890 * Only check for symlinks in components below the jail's path, 891 * since that's where the security risk lies. 892 */ 893 jailpath = string_param(j->intparams[KP_PATH]); 894 if (jailpath == NULL) 895 jailpath = ""; 896 jplen = strlen(jailpath); 897 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 898 tpath = alloca(strlen(path) + 1); 899 strcpy(tpath, path); 900 for (p = tpath + jplen; p != NULL; ) { 901 p = strchr(p + 1, '/'); 902 if (p) 903 *p = '\0'; 904 if (lstat(tpath, &st) < 0) { 905 if (errno == ENOENT && isfile && !p) 906 break; 907 jail_warnx(j, "%s: %s: %s", pname, tpath, 908 strerror(errno)); 909 return -1; 910 } 911 if (S_ISLNK(st.st_mode)) { 912 jail_warnx(j, "%s: %s is a symbolic link", 913 pname, tpath); 914 return -1; 915 } 916 if (p) 917 *p = '/'; 918 } 919 } 920 if (umount_type != NULL) { 921 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 922 jail_warnx(j, "%s: %s: %s", pname, path, 923 strerror(errno)); 924 return -1; 925 } 926 if (stat(stfs.f_mntonname, &mpst) < 0) { 927 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 928 strerror(errno)); 929 return -1; 930 } 931 if (st.st_ino != mpst.st_ino) { 932 jail_warnx(j, "%s: %s: not a mount point", 933 pname, path); 934 return -1; 935 } 936 if (strcmp(stfs.f_fstypename, umount_type)) { 937 jail_warnx(j, "%s: %s: not a %s mount", 938 pname, path, umount_type); 939 return -1; 940 } 941 } 942 return 0; 943 } 944