1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 James Gritton 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/cpuset.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 static cpusetid_t 86 root_cpuset_id(void) 87 { 88 static cpusetid_t setid = CPUSET_INVALID; 89 static int error; 90 91 /* Only try to get the cpuset once. */ 92 if (error == 0 && setid == CPUSET_INVALID) 93 error = cpuset_getid(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1, &setid); 94 if (error != 0) 95 return (CPUSET_INVALID); 96 return (setid); 97 } 98 99 /* 100 * Run the next command associated with a jail. 101 */ 102 int 103 next_command(struct cfjail *j) 104 { 105 enum intparam comparam; 106 int create_failed, stopping; 107 108 if (paralimit == 0) { 109 if (j->flags & JF_FROM_RUNQ) 110 requeue_head(j, &runnable); 111 else 112 requeue(j, &runnable); 113 return 1; 114 } 115 j->flags &= ~JF_FROM_RUNQ; 116 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 117 stopping = (j->flags & JF_STOP) != 0; 118 comparam = *j->comparam; 119 for (;;) { 120 if (j->comstring == NULL) { 121 j->comparam += create_failed ? -1 : 1; 122 switch ((comparam = *j->comparam)) { 123 case IP__NULL: 124 return 0; 125 case IP_MOUNT_DEVFS: 126 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 127 continue; 128 j->comstring = &dummystring; 129 break; 130 case IP_MOUNT_FDESCFS: 131 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 132 continue; 133 j->comstring = &dummystring; 134 break; 135 case IP_MOUNT_PROCFS: 136 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 137 continue; 138 j->comstring = &dummystring; 139 break; 140 case IP__OP: 141 case IP_STOP_TIMEOUT: 142 j->comstring = &dummystring; 143 break; 144 default: 145 if (j->intparams[comparam] == NULL) 146 continue; 147 j->comstring = create_failed || (stopping && 148 (j->intparams[comparam]->flags & PF_REV)) 149 ? TAILQ_LAST(&j->intparams[comparam]->val, 150 cfstrings) 151 : TAILQ_FIRST(&j->intparams[comparam]->val); 152 } 153 } else { 154 j->comstring = j->comstring == &dummystring ? NULL : 155 create_failed || (stopping && 156 (j->intparams[comparam]->flags & PF_REV)) 157 ? TAILQ_PREV(j->comstring, cfstrings, tq) 158 : TAILQ_NEXT(j->comstring, tq); 159 } 160 if (j->comstring == NULL || j->comstring->len == 0 || 161 (create_failed && (comparam == IP_EXEC_PRESTART || 162 comparam == IP_EXEC_CREATED || comparam == IP_EXEC_START || 163 comparam == IP_COMMAND || comparam == IP_EXEC_POSTSTART || 164 comparam == IP_EXEC_PREPARE))) 165 continue; 166 switch (run_command(j)) { 167 case -1: 168 failed(j); 169 /* FALLTHROUGH */ 170 case 1: 171 return 1; 172 } 173 } 174 } 175 176 /* 177 * Check command exit status 178 */ 179 int 180 finish_command(struct cfjail *j) 181 { 182 struct cfjail *rj; 183 int error; 184 185 if (!(j->flags & JF_SLEEPQ)) 186 return 0; 187 j->flags &= ~JF_SLEEPQ; 188 if (*j->comparam == IP_STOP_TIMEOUT) { 189 j->flags &= ~JF_TIMEOUT; 190 j->pstatus = 0; 191 return 0; 192 } 193 paralimit++; 194 if (!TAILQ_EMPTY(&runnable)) { 195 rj = TAILQ_FIRST(&runnable); 196 rj->flags |= JF_FROM_RUNQ; 197 requeue(rj, &ready); 198 } 199 error = 0; 200 if (j->flags & JF_TIMEOUT) { 201 j->flags &= ~JF_TIMEOUT; 202 if (*j->comparam != IP_STOP_TIMEOUT) { 203 jail_warnx(j, "%s: timed out", j->comline); 204 failed(j); 205 error = -1; 206 } else if (verbose > 0) 207 jail_note(j, "timed out\n"); 208 } else if (j->pstatus != 0) { 209 if (WIFSIGNALED(j->pstatus)) 210 jail_warnx(j, "%s: exited on signal %d", 211 j->comline, WTERMSIG(j->pstatus)); 212 else 213 jail_warnx(j, "%s: failed", j->comline); 214 j->pstatus = 0; 215 failed(j); 216 error = -1; 217 } 218 free(j->comline); 219 j->comline = NULL; 220 return error; 221 } 222 223 /* 224 * Check for finished processes or timeouts. 225 */ 226 struct cfjail * 227 next_proc(int nonblock) 228 { 229 struct kevent ke; 230 struct timespec ts; 231 struct timespec *tsp; 232 struct cfjail *j; 233 234 if (!TAILQ_EMPTY(&sleeping)) { 235 again: 236 tsp = NULL; 237 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 238 clock_gettime(CLOCK_REALTIME, &ts); 239 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 240 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 241 if (ts.tv_nsec < 0) { 242 ts.tv_sec--; 243 ts.tv_nsec += 1000000000; 244 } 245 if (ts.tv_sec < 0 || 246 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 247 j->flags |= JF_TIMEOUT; 248 clear_procs(j); 249 return j; 250 } 251 tsp = &ts; 252 } 253 if (nonblock) { 254 ts.tv_sec = 0; 255 ts.tv_nsec = 0; 256 tsp = &ts; 257 } 258 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 259 case -1: 260 if (errno != EINTR) 261 err(1, "kevent"); 262 goto again; 263 case 0: 264 if (!nonblock) { 265 j = TAILQ_FIRST(&sleeping); 266 j->flags |= JF_TIMEOUT; 267 clear_procs(j); 268 return j; 269 } 270 break; 271 case 1: 272 (void)waitpid(ke.ident, NULL, WNOHANG); 273 if ((j = find_proc(ke.ident))) { 274 j->pstatus = ke.data; 275 return j; 276 } 277 goto again; 278 } 279 } 280 return NULL; 281 } 282 283 /* 284 * Run a single command for a jail, possibly inside the jail. 285 */ 286 static int 287 run_command(struct cfjail *j) 288 { 289 const struct passwd *pwd; 290 const struct cfstring *comstring, *s; 291 login_cap_t *lcap; 292 const char **argv; 293 char *acs, *cs, *comcs, *devpath; 294 const char *jidstr, *conslog, *fmt, *path, *ruleset, *term, *username; 295 enum intparam comparam; 296 size_t comlen, ret; 297 pid_t pid; 298 cpusetid_t setid; 299 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 300 #if defined(INET) || defined(INET6) 301 char *addr, *extrap, *p, *val; 302 #endif 303 304 static char *cleanenv; 305 306 /* Perform some operations that aren't actually commands */ 307 comparam = *j->comparam; 308 down = j->flags & (JF_STOP | JF_FAILED); 309 switch (comparam) { 310 case IP_STOP_TIMEOUT: 311 return term_procs(j); 312 313 case IP__OP: 314 if (down) { 315 if (jail_remove(j->jid) < 0 && errno == EPERM) { 316 jail_warnx(j, "jail_remove: %s", 317 strerror(errno)); 318 return -1; 319 } 320 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 321 ? note_remove : j->name != NULL))) 322 jail_note(j, "removed\n"); 323 j->jid = -1; 324 if (j->flags & JF_STOP) 325 dep_done(j, DF_LIGHT); 326 else 327 j->flags &= ~JF_PERSIST; 328 } else { 329 if (create_jail(j) < 0) 330 return -1; 331 if (iflag) 332 printf("%d\n", j->jid); 333 if (verbose >= 0 && (j->name || verbose > 0)) 334 jail_note(j, "created\n"); 335 dep_done(j, DF_LIGHT); 336 } 337 return 0; 338 339 default: ; 340 } 341 /* 342 * Collect exec arguments. Internal commands for network and 343 * mounting build their own argument lists. 344 */ 345 comstring = j->comstring; 346 bg = 0; 347 switch (comparam) { 348 #ifdef INET 349 case IP__IP4_IFADDR: 350 argc = 0; 351 val = alloca(strlen(comstring->s) + 1); 352 strcpy(val, comstring->s); 353 cs = val; 354 extrap = NULL; 355 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 356 if (extrap == NULL) { 357 *p = '\0'; 358 extrap = p + 1; 359 } 360 cs = p + 1; 361 argc++; 362 } 363 364 argv = alloca((8 + argc) * sizeof(char *)); 365 argv[0] = _PATH_IFCONFIG; 366 if ((cs = strchr(val, '|'))) { 367 argv[1] = acs = alloca(cs - val + 1); 368 strlcpy(acs, val, cs - val + 1); 369 addr = cs + 1; 370 } else { 371 argv[1] = string_param(j->intparams[IP_INTERFACE]); 372 addr = val; 373 } 374 argv[2] = "inet"; 375 if (!(cs = strchr(addr, '/'))) { 376 argv[3] = addr; 377 argv[4] = "netmask"; 378 argv[5] = "255.255.255.255"; 379 argc = 6; 380 } else if (strchr(cs + 1, '.')) { 381 argv[3] = acs = alloca(cs - addr + 1); 382 strlcpy(acs, addr, cs - addr + 1); 383 argv[4] = "netmask"; 384 argv[5] = cs + 1; 385 argc = 6; 386 } else { 387 argv[3] = addr; 388 argc = 4; 389 } 390 391 if (!down && extrap != NULL) { 392 for (cs = strtok(extrap, " "); cs; 393 cs = strtok(NULL, " ")) { 394 size_t len = strlen(cs) + 1; 395 argv[argc++] = acs = alloca(len); 396 strlcpy(acs, cs, len); 397 } 398 } 399 400 argv[argc] = down ? "-alias" : "alias"; 401 argv[argc + 1] = NULL; 402 break; 403 #endif 404 405 #ifdef INET6 406 case IP__IP6_IFADDR: 407 argc = 0; 408 val = alloca(strlen(comstring->s) + 1); 409 strcpy(val, comstring->s); 410 cs = val; 411 extrap = NULL; 412 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 413 if (extrap == NULL) { 414 *p = '\0'; 415 extrap = p + 1; 416 } 417 cs = p + 1; 418 argc++; 419 } 420 421 argv = alloca((8 + argc) * sizeof(char *)); 422 argv[0] = _PATH_IFCONFIG; 423 if ((cs = strchr(val, '|'))) { 424 argv[1] = acs = alloca(cs - val + 1); 425 strlcpy(acs, val, cs - val + 1); 426 addr = cs + 1; 427 } else { 428 argv[1] = string_param(j->intparams[IP_INTERFACE]); 429 addr = val; 430 } 431 argv[2] = "inet6"; 432 argv[3] = addr; 433 if (!(cs = strchr(addr, '/'))) { 434 argv[4] = "prefixlen"; 435 argv[5] = "128"; 436 argc = 6; 437 } else 438 argc = 4; 439 440 if (!down && extrap != NULL) { 441 for (cs = strtok(extrap, " "); cs; 442 cs = strtok(NULL, " ")) { 443 size_t len = strlen(cs) + 1; 444 argv[argc++] = acs = alloca(len); 445 strlcpy(acs, cs, len); 446 } 447 } 448 449 argv[argc] = down ? "-alias" : "alias"; 450 argv[argc + 1] = NULL; 451 break; 452 #endif 453 454 case IP_VNET_INTERFACE: 455 argv = alloca(5 * sizeof(char *)); 456 argv[0] = _PATH_IFCONFIG; 457 argv[1] = comstring->s; 458 argv[2] = down ? "-vnet" : "vnet"; 459 jidstr = string_param(j->intparams[KP_JID]); 460 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 461 argv[4] = NULL; 462 break; 463 464 case IP_MOUNT: 465 case IP__MOUNT_FROM_FSTAB: 466 argv = alloca(8 * sizeof(char *)); 467 comcs = alloca(comstring->len + 1); 468 strcpy(comcs, comstring->s); 469 argc = 0; 470 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 471 cs = strtok(NULL, " \t\f\v\r\n")) { 472 if (argc <= 1 && strunvis(cs, cs) < 0) { 473 jail_warnx(j, "%s: %s: fstab parse error", 474 j->intparams[comparam]->name, comstring->s); 475 return -1; 476 } 477 argv[argc++] = cs; 478 } 479 if (argc == 0) 480 return 0; 481 if (argc < 3) { 482 jail_warnx(j, "%s: %s: missing information", 483 j->intparams[comparam]->name, comstring->s); 484 return -1; 485 } 486 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 487 down ? argv[2] : NULL) < 0) 488 return -1; 489 if (down) { 490 argv[4] = NULL; 491 argv[3] = argv[1]; 492 argv[0] = "/sbin/umount"; 493 } else { 494 if (argc == 4) { 495 argv[7] = NULL; 496 argv[6] = argv[1]; 497 argv[5] = argv[0]; 498 argv[4] = argv[3]; 499 argv[3] = "-o"; 500 } else { 501 argv[5] = NULL; 502 argv[4] = argv[1]; 503 argv[3] = argv[0]; 504 } 505 argv[0] = _PATH_MOUNT; 506 } 507 argv[1] = "-t"; 508 break; 509 510 case IP_MOUNT_DEVFS: 511 argv = alloca(7 * sizeof(char *)); 512 path = string_param(j->intparams[KP_PATH]); 513 if (path == NULL) { 514 jail_warnx(j, "mount.devfs: no jail root path defined"); 515 return -1; 516 } 517 devpath = alloca(strlen(path) + 5); 518 sprintf(devpath, "%s/dev", path); 519 if (check_path(j, "mount.devfs", devpath, 0, 520 down ? "devfs" : NULL) < 0) 521 return -1; 522 if (down) { 523 argv[0] = "/sbin/umount"; 524 argv[1] = devpath; 525 argv[2] = NULL; 526 } else { 527 argv[0] = _PATH_MOUNT; 528 argv[1] = "-t"; 529 argv[2] = "devfs"; 530 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 531 if (!ruleset) 532 ruleset = "4"; /* devfsrules_jail */ 533 argv[3] = acs = alloca(11 + strlen(ruleset)); 534 sprintf(acs, "-oruleset=%s", ruleset); 535 argv[4] = "."; 536 argv[5] = devpath; 537 argv[6] = NULL; 538 } 539 break; 540 541 case IP_MOUNT_FDESCFS: 542 argv = alloca(7 * sizeof(char *)); 543 path = string_param(j->intparams[KP_PATH]); 544 if (path == NULL) { 545 jail_warnx(j, "mount.fdescfs: no jail root path defined"); 546 return -1; 547 } 548 devpath = alloca(strlen(path) + 8); 549 sprintf(devpath, "%s/dev/fd", path); 550 if (check_path(j, "mount.fdescfs", devpath, 0, 551 down ? "fdescfs" : NULL) < 0) 552 return -1; 553 if (down) { 554 argv[0] = "/sbin/umount"; 555 argv[1] = devpath; 556 argv[2] = NULL; 557 } else { 558 argv[0] = _PATH_MOUNT; 559 argv[1] = "-t"; 560 argv[2] = "fdescfs"; 561 argv[3] = "."; 562 argv[4] = devpath; 563 argv[5] = NULL; 564 } 565 break; 566 567 case IP_MOUNT_PROCFS: 568 argv = alloca(7 * sizeof(char *)); 569 path = string_param(j->intparams[KP_PATH]); 570 if (path == NULL) { 571 jail_warnx(j, "mount.procfs: no jail root path defined"); 572 return -1; 573 } 574 devpath = alloca(strlen(path) + 6); 575 sprintf(devpath, "%s/proc", path); 576 if (check_path(j, "mount.procfs", devpath, 0, 577 down ? "procfs" : NULL) < 0) 578 return -1; 579 if (down) { 580 argv[0] = "/sbin/umount"; 581 argv[1] = devpath; 582 argv[2] = NULL; 583 } else { 584 argv[0] = _PATH_MOUNT; 585 argv[1] = "-t"; 586 argv[2] = "procfs"; 587 argv[3] = "."; 588 argv[4] = devpath; 589 argv[5] = NULL; 590 } 591 break; 592 593 case IP_ZFS_DATASET: 594 argv = alloca(4 * sizeof(char *)); 595 jidstr = string_param(j->intparams[KP_JID]) ? 596 string_param(j->intparams[KP_JID]) : 597 string_param(j->intparams[KP_NAME]); 598 fmt = "if [ $(/sbin/zfs get -H -o value jailed %s) = on ]; then /sbin/zfs jail %s %s || echo error, attaching %s to jail %s failed; else echo error, you need to set jailed=on for dataset %s; fi"; 599 comlen = strlen(fmt) 600 + 2 * strlen(jidstr) 601 + 4 * comstring->len 602 - 6 * 2 /* 6 * "%s" */ 603 + 1; 604 comcs = alloca(comlen); 605 ret = snprintf(comcs, comlen, fmt, comstring->s, 606 jidstr, comstring->s, comstring->s, jidstr, 607 comstring->s); 608 if (ret >= comlen) { 609 jail_warnx(j, "internal error in ZFS dataset handling"); 610 exit(1); 611 } 612 argv[0] = _PATH_BSHELL; 613 argv[1] = "-c"; 614 argv[2] = comcs; 615 argv[3] = NULL; 616 break; 617 618 case IP_COMMAND: 619 if (j->name != NULL) 620 goto default_command; 621 argc = 0; 622 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 623 argc++; 624 argv = alloca((argc + 1) * sizeof(char *)); 625 argc = 0; 626 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 627 argv[argc++] = s->s; 628 argv[argc] = NULL; 629 j->comstring = &dummystring; 630 break; 631 632 default: 633 default_command: 634 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 635 !(cs[0] == '&' && cs[1] == '\0')) { 636 argv = alloca(4 * sizeof(char *)); 637 argv[0] = _PATH_BSHELL; 638 argv[1] = "-c"; 639 argv[2] = comstring->s; 640 argv[3] = NULL; 641 } else { 642 if (cs) { 643 *cs = 0; 644 bg = 1; 645 } 646 comcs = alloca(comstring->len + 1); 647 strcpy(comcs, comstring->s); 648 argc = 0; 649 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 650 cs = strtok(NULL, " \t\f\v\r\n")) 651 argc++; 652 argv = alloca((argc + 1) * sizeof(char *)); 653 strcpy(comcs, comstring->s); 654 argc = 0; 655 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 656 cs = strtok(NULL, " \t\f\v\r\n")) 657 argv[argc++] = cs; 658 argv[argc] = NULL; 659 } 660 } 661 if (argv[0] == NULL) 662 return 0; 663 664 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 665 timeout != 0) { 666 clock_gettime(CLOCK_REALTIME, &j->timeout); 667 j->timeout.tv_sec += timeout; 668 } else 669 j->timeout.tv_sec = 0; 670 671 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 672 comparam == IP_EXEC_STOP; 673 if (injail) 674 setid = root_cpuset_id(); 675 else 676 setid = CPUSET_INVALID; 677 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 678 username = string_param(j->intparams[injail 679 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 680 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 681 682 consfd = 0; 683 if (injail && 684 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 685 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 686 return -1; 687 consfd = 688 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 689 if (consfd < 0) { 690 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 691 return -1; 692 } 693 } 694 695 comlen = 0; 696 for (i = 0; argv[i]; i++) 697 comlen += strlen(argv[i]) + 1; 698 j->comline = cs = emalloc(comlen); 699 for (i = 0; argv[i]; i++) { 700 strcpy(cs, argv[i]); 701 if (argv[i + 1]) { 702 cs += strlen(argv[i]) + 1; 703 cs[-1] = ' '; 704 } 705 } 706 if (verbose > 0) 707 jail_note(j, "run command%s%s%s: %s\n", 708 injail ? " in jail" : "", username ? " as " : "", 709 username ? username : "", j->comline); 710 711 pid = fork(); 712 if (pid < 0) 713 err(1, "fork"); 714 if (pid > 0) { 715 if (bg || !add_proc(j, pid)) { 716 free(j->comline); 717 j->comline = NULL; 718 return 0; 719 } else { 720 paralimit--; 721 return 1; 722 } 723 } 724 if (bg) 725 setsid(); 726 727 /* Set up the environment and run the command */ 728 pwd = NULL; 729 lcap = NULL; 730 if ((clean || username) && injail && sjuser && 731 get_user_info(j, username, &pwd, &lcap) < 0) 732 exit(1); 733 if (injail) { 734 /* jail_attach won't chdir along with its chroot. */ 735 path = string_param(j->intparams[KP_PATH]); 736 if (path && chdir(path) < 0) { 737 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 738 exit(1); 739 } 740 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 741 setfib(fib) < 0) { 742 jail_warnx(j, "setfib: %s", strerror(errno)); 743 exit(1); 744 } 745 746 /* 747 * We wouldn't have specialized our affinity, so just setid to 748 * root. We do this prior to attaching to avoid the kernel 749 * having to create a transient cpuset that we'll promptly 750 * free up with a reset to the jail's cpuset. 751 * 752 * This is just a best-effort to use as wide of mask as 753 * possible. 754 */ 755 if (setid != CPUSET_INVALID) 756 (void)cpuset_setid(CPU_WHICH_PID, -1, setid); 757 758 if (jail_attach(j->jid) < 0) { 759 jail_warnx(j, "jail_attach: %s", strerror(errno)); 760 exit(1); 761 } 762 } 763 if (clean || username) { 764 if (!(injail && sjuser) && 765 get_user_info(j, username, &pwd, &lcap) < 0) 766 exit(1); 767 if (clean) { 768 term = getenv("TERM"); 769 environ = &cleanenv; 770 setenv("PATH", "/bin:/usr/bin", 0); 771 if (term != NULL) 772 setenv("TERM", term, 1); 773 } 774 if (setgid(pwd->pw_gid) < 0) { 775 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 776 strerror(errno)); 777 exit(1); 778 } 779 if (setusercontext(lcap, pwd, pwd->pw_uid, username 780 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 781 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 782 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 783 strerror(errno)); 784 exit(1); 785 } 786 login_close(lcap); 787 setenv("USER", pwd->pw_name, 1); 788 setenv("HOME", pwd->pw_dir, 1); 789 setenv("SHELL", 790 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 791 if (clean && username && chdir(pwd->pw_dir) < 0) { 792 jail_warnx(j, "chdir %s: %s", 793 pwd->pw_dir, strerror(errno)); 794 exit(1); 795 } 796 endpwent(); 797 } 798 799 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 800 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 801 exit(1); 802 } 803 closefrom(3); 804 execvp(argv[0], __DECONST(char *const*, argv)); 805 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 806 exit(1); 807 } 808 809 /* 810 * Add a process to the hash, tied to a jail. 811 */ 812 static int 813 add_proc(struct cfjail *j, pid_t pid) 814 { 815 struct kevent ke; 816 struct cfjail *tj; 817 struct phash *ph; 818 819 if (!kq && (kq = kqueue()) < 0) 820 err(1, "kqueue"); 821 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 822 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 823 if (errno == ESRCH) 824 return 0; 825 err(1, "kevent"); 826 } 827 ph = emalloc(sizeof(struct phash)); 828 ph->j = j; 829 ph->pid = pid; 830 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 831 j->nprocs++; 832 j->flags |= JF_SLEEPQ; 833 if (j->timeout.tv_sec == 0) 834 requeue(j, &sleeping); 835 else { 836 /* File the jail in the sleep queue according to its timeout. */ 837 TAILQ_REMOVE(j->queue, j, tq); 838 TAILQ_FOREACH(tj, &sleeping, tq) { 839 if (!tj->timeout.tv_sec || 840 j->timeout.tv_sec < tj->timeout.tv_sec || 841 (j->timeout.tv_sec == tj->timeout.tv_sec && 842 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 843 TAILQ_INSERT_BEFORE(tj, j, tq); 844 break; 845 } 846 } 847 if (tj == NULL) 848 TAILQ_INSERT_TAIL(&sleeping, j, tq); 849 j->queue = &sleeping; 850 } 851 return 1; 852 } 853 854 /* 855 * Remove any processes from the hash that correspond to a jail. 856 */ 857 static void 858 clear_procs(struct cfjail *j) 859 { 860 struct kevent ke; 861 struct phash *ph, *tph; 862 int i; 863 864 j->nprocs = 0; 865 for (i = 0; i < PHASH_SIZE; i++) 866 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 867 if (ph->j == j) { 868 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 869 NOTE_EXIT, 0, NULL); 870 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 871 LIST_REMOVE(ph, le); 872 free(ph); 873 } 874 } 875 876 /* 877 * Find the jail that corresponds to an exited process. 878 */ 879 static struct cfjail * 880 find_proc(pid_t pid) 881 { 882 struct cfjail *j; 883 struct phash *ph; 884 885 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 886 if (ph->pid == pid) { 887 j = ph->j; 888 LIST_REMOVE(ph, le); 889 free(ph); 890 return --j->nprocs ? NULL : j; 891 } 892 return NULL; 893 } 894 895 /* 896 * Send SIGTERM to all processes in a jail and wait for them to die. 897 */ 898 static int 899 term_procs(struct cfjail *j) 900 { 901 struct kinfo_proc *ki; 902 int i, noted, pcnt, timeout; 903 904 static kvm_t *kd; 905 906 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 907 timeout = DEFAULT_STOP_TIMEOUT; 908 else if (timeout == 0) 909 return 0; 910 911 if (kd == NULL) { 912 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 913 if (kd == NULL) 914 return 0; 915 } 916 917 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 918 if (ki == NULL) 919 return 0; 920 noted = 0; 921 for (i = 0; i < pcnt; i++) 922 if (ki[i].ki_jid == j->jid && 923 kill(ki[i].ki_pid, SIGTERM) == 0) { 924 (void)add_proc(j, ki[i].ki_pid); 925 if (verbose > 0) { 926 if (!noted) { 927 noted = 1; 928 jail_note(j, "sent SIGTERM to:"); 929 } 930 printf(" %d", ki[i].ki_pid); 931 } 932 } 933 if (noted) 934 printf("\n"); 935 if (j->nprocs > 0) { 936 clock_gettime(CLOCK_REALTIME, &j->timeout); 937 j->timeout.tv_sec += timeout; 938 return 1; 939 } 940 return 0; 941 } 942 943 /* 944 * Look up a user in the passwd and login.conf files. 945 */ 946 static int 947 get_user_info(struct cfjail *j, const char *username, 948 const struct passwd **pwdp, login_cap_t **lcapp) 949 { 950 const struct passwd *pwd; 951 952 errno = 0; 953 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 954 if (pwd == NULL) { 955 if (errno) 956 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 957 username ? username : "", strerror(errno)); 958 else if (username) 959 jail_warnx(j, "%s: no such user", username); 960 else 961 jail_warnx(j, "unknown uid %d", getuid()); 962 return -1; 963 } 964 *lcapp = login_getpwclass(pwd); 965 if (*lcapp == NULL) { 966 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 967 strerror(errno)); 968 return -1; 969 } 970 /* Set the groups while the group file is still available */ 971 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 972 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 973 strerror(errno)); 974 return -1; 975 } 976 return 0; 977 } 978 979 /* 980 * Make sure a mount or consolelog path is a valid absolute pathname 981 * with no symlinks. 982 */ 983 static int 984 check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 985 const char *umount_type) 986 { 987 struct stat st, mpst; 988 struct statfs stfs; 989 char *tpath, *p; 990 const char *jailpath; 991 size_t jplen; 992 993 if (path[0] != '/') { 994 jail_warnx(j, "%s: %s: not an absolute pathname", 995 pname, path); 996 return -1; 997 } 998 /* 999 * Only check for symlinks in components below the jail's path, 1000 * since that's where the security risk lies. 1001 */ 1002 jailpath = string_param(j->intparams[KP_PATH]); 1003 if (jailpath == NULL) 1004 jailpath = ""; 1005 jplen = strlen(jailpath); 1006 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 1007 tpath = alloca(strlen(path) + 1); 1008 strcpy(tpath, path); 1009 for (p = tpath + jplen; p != NULL; ) { 1010 p = strchr(p + 1, '/'); 1011 if (p) 1012 *p = '\0'; 1013 if (lstat(tpath, &st) < 0) { 1014 if (errno == ENOENT && isfile && !p) 1015 break; 1016 jail_warnx(j, "%s: %s: %s", pname, tpath, 1017 strerror(errno)); 1018 return -1; 1019 } 1020 if (S_ISLNK(st.st_mode)) { 1021 jail_warnx(j, "%s: %s is a symbolic link", 1022 pname, tpath); 1023 return -1; 1024 } 1025 if (p) 1026 *p = '/'; 1027 } 1028 } 1029 if (umount_type != NULL) { 1030 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 1031 jail_warnx(j, "%s: %s: %s", pname, path, 1032 strerror(errno)); 1033 return -1; 1034 } 1035 if (stat(stfs.f_mntonname, &mpst) < 0) { 1036 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 1037 strerror(errno)); 1038 return -1; 1039 } 1040 if (st.st_ino != mpst.st_ino) { 1041 jail_warnx(j, "%s: %s: not a mount point", 1042 pname, path); 1043 return -1; 1044 } 1045 if (strcmp(stfs.f_fstypename, umount_type)) { 1046 jail_warnx(j, "%s: %s: not a %s mount", 1047 pname, path, umount_type); 1048 return -1; 1049 } 1050 } 1051 return 0; 1052 } 1053