1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/usr.sbin/jail/command.c 344250 2019-02-18 10:13:52Z marck $"); 31 32#include <sys/types.h> 33#include <sys/event.h> 34#include <sys/mount.h> 35#include <sys/stat.h> 36#include <sys/sysctl.h> 37#include <sys/user.h> 38#include <sys/wait.h> 39 40#include <err.h> 41#include <errno.h> 42#include <fcntl.h> 43#include <kvm.h> 44#include <login_cap.h> 45#include <paths.h> 46#include <pwd.h> 47#include <signal.h> 48#include <stdio.h> 49#include <stdlib.h> 50#include <string.h> 51#include <unistd.h> 52#include <vis.h> 53 54#include "jailp.h" 55 56#define DEFAULT_STOP_TIMEOUT 10 57#define PHASH_SIZE 256 58 59LIST_HEAD(phhead, phash); 60 61struct phash { 62 LIST_ENTRY(phash) le; 63 struct cfjail *j; 64 pid_t pid; 65}; 66 67int paralimit = -1; 68 69extern char **environ; 70 71static int run_command(struct cfjail *j); 72static int add_proc(struct cfjail *j, pid_t pid); 73static void clear_procs(struct cfjail *j); 74static struct cfjail *find_proc(pid_t pid); 75static int term_procs(struct cfjail *j); 76static int get_user_info(struct cfjail *j, const char *username, 77 const struct passwd **pwdp, login_cap_t **lcapp); 78static int check_path(struct cfjail *j, const char *pname, const char *path, 79 int isfile, const char *umount_type); 80 81static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 82static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 83static struct cfstring dummystring = { .len = 1 }; 84static struct phhead phash[PHASH_SIZE]; 85static int kq; 86 87/* 88 * Run the next command associated with a jail. 89 */ 90int 91next_command(struct cfjail *j) 92{ 93 enum intparam comparam; 94 int create_failed, stopping; 95 96 if (paralimit == 0) { 97 if (j->flags & JF_FROM_RUNQ) 98 requeue_head(j, &runnable); 99 else 100 requeue(j, &runnable); 101 return 1; 102 } 103 j->flags &= ~JF_FROM_RUNQ; 104 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 105 stopping = (j->flags & JF_STOP) != 0; 106 comparam = *j->comparam; 107 for (;;) { 108 if (j->comstring == NULL) { 109 j->comparam += create_failed ? -1 : 1; 110 switch ((comparam = *j->comparam)) { 111 case IP__NULL: 112 return 0; 113 case IP_MOUNT_DEVFS: 114 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 115 continue; 116 j->comstring = &dummystring; 117 break; 118 case IP_MOUNT_FDESCFS: 119 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 120 continue; 121 j->comstring = &dummystring; 122 break; 123 case IP_MOUNT_PROCFS: 124 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 125 continue; 126 j->comstring = &dummystring; 127 break; 128 case IP__OP: 129 case IP_STOP_TIMEOUT: 130 j->comstring = &dummystring; 131 break; 132 default: 133 if (j->intparams[comparam] == NULL) 134 continue; 135 j->comstring = create_failed || (stopping && 136 (j->intparams[comparam]->flags & PF_REV)) 137 ? TAILQ_LAST(&j->intparams[comparam]->val, 138 cfstrings) 139 : TAILQ_FIRST(&j->intparams[comparam]->val); 140 } 141 } else { 142 j->comstring = j->comstring == &dummystring ? NULL : 143 create_failed || (stopping && 144 (j->intparams[comparam]->flags & PF_REV)) 145 ? TAILQ_PREV(j->comstring, cfstrings, tq) 146 : TAILQ_NEXT(j->comstring, tq); 147 } 148 if (j->comstring == NULL || j->comstring->len == 0 || 149 (create_failed && (comparam == IP_EXEC_PRESTART || 150 comparam == IP_EXEC_START || comparam == IP_COMMAND || 151 comparam == IP_EXEC_POSTSTART))) 152 continue; 153 switch (run_command(j)) { 154 case -1: 155 failed(j); 156 /* FALLTHROUGH */ 157 case 1: 158 return 1; 159 } 160 } 161} 162 163/* 164 * Check command exit status 165 */ 166int 167finish_command(struct cfjail *j) 168{ 169 struct cfjail *rj; 170 int error; 171 172 if (!(j->flags & JF_SLEEPQ)) 173 return 0; 174 j->flags &= ~JF_SLEEPQ; 175 if (*j->comparam == IP_STOP_TIMEOUT) { 176 j->flags &= ~JF_TIMEOUT; 177 j->pstatus = 0; 178 return 0; 179 } 180 paralimit++; 181 if (!TAILQ_EMPTY(&runnable)) { 182 rj = TAILQ_FIRST(&runnable); 183 rj->flags |= JF_FROM_RUNQ; 184 requeue(rj, &ready); 185 } 186 error = 0; 187 if (j->flags & JF_TIMEOUT) { 188 j->flags &= ~JF_TIMEOUT; 189 if (*j->comparam != IP_STOP_TIMEOUT) { 190 jail_warnx(j, "%s: timed out", j->comline); 191 failed(j); 192 error = -1; 193 } else if (verbose > 0) 194 jail_note(j, "timed out\n"); 195 } else if (j->pstatus != 0) { 196 if (WIFSIGNALED(j->pstatus)) 197 jail_warnx(j, "%s: exited on signal %d", 198 j->comline, WTERMSIG(j->pstatus)); 199 else 200 jail_warnx(j, "%s: failed", j->comline); 201 j->pstatus = 0; 202 failed(j); 203 error = -1; 204 } 205 free(j->comline); 206 j->comline = NULL; 207 return error; 208} 209 210/* 211 * Check for finished processes or timeouts. 212 */ 213struct cfjail * 214next_proc(int nonblock) 215{ 216 struct kevent ke; 217 struct timespec ts; 218 struct timespec *tsp; 219 struct cfjail *j; 220 221 if (!TAILQ_EMPTY(&sleeping)) { 222 again: 223 tsp = NULL; 224 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 225 clock_gettime(CLOCK_REALTIME, &ts); 226 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 227 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 228 if (ts.tv_nsec < 0) { 229 ts.tv_sec--; 230 ts.tv_nsec += 1000000000; 231 } 232 if (ts.tv_sec < 0 || 233 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 234 j->flags |= JF_TIMEOUT; 235 clear_procs(j); 236 return j; 237 } 238 tsp = &ts; 239 } 240 if (nonblock) { 241 ts.tv_sec = 0; 242 ts.tv_nsec = 0; 243 tsp = &ts; 244 } 245 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 246 case -1: 247 if (errno != EINTR) 248 err(1, "kevent"); 249 goto again; 250 case 0: 251 if (!nonblock) { 252 j = TAILQ_FIRST(&sleeping); 253 j->flags |= JF_TIMEOUT; 254 clear_procs(j); 255 return j; 256 } 257 break; 258 case 1: 259 (void)waitpid(ke.ident, NULL, WNOHANG); 260 if ((j = find_proc(ke.ident))) { 261 j->pstatus = ke.data; 262 return j; 263 } 264 goto again; 265 } 266 } 267 return NULL; 268} 269 270/* 271 * Run a single command for a jail, possibly inside the jail. 272 */ 273static int 274run_command(struct cfjail *j) 275{ 276 const struct passwd *pwd; 277 const struct cfstring *comstring, *s; 278 login_cap_t *lcap; 279 const char **argv; 280 char *acs, *cs, *comcs, *devpath; 281 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 282 enum intparam comparam; 283 size_t comlen; 284 pid_t pid; 285 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 286#if defined(INET) || defined(INET6) 287 char *addr, *extrap, *p, *val; 288#endif 289 290 static char *cleanenv; 291 292 /* Perform some operations that aren't actually commands */ 293 comparam = *j->comparam; 294 down = j->flags & (JF_STOP | JF_FAILED); 295 switch (comparam) { 296 case IP_STOP_TIMEOUT: 297 return term_procs(j); 298 299 case IP__OP: 300 if (down) { 301 if (jail_remove(j->jid) < 0 && errno == EPERM) { 302 jail_warnx(j, "jail_remove: %s", 303 strerror(errno)); 304 return -1; 305 } 306 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 307 ? note_remove : j->name != NULL))) 308 jail_note(j, "removed\n"); 309 j->jid = -1; 310 if (j->flags & JF_STOP) 311 dep_done(j, DF_LIGHT); 312 else 313 j->flags &= ~JF_PERSIST; 314 } else { 315 if (create_jail(j) < 0) 316 return -1; 317 if (iflag) 318 printf("%d\n", j->jid); 319 if (verbose >= 0 && (j->name || verbose > 0)) 320 jail_note(j, "created\n"); 321 dep_done(j, DF_LIGHT); 322 } 323 return 0; 324 325 default: ; 326 } 327 /* 328 * Collect exec arguments. Internal commands for network and 329 * mounting build their own argument lists. 330 */ 331 comstring = j->comstring; 332 bg = 0; 333 switch (comparam) { 334#ifdef INET 335 case IP__IP4_IFADDR: 336 argc = 0; 337 val = alloca(strlen(comstring->s) + 1); 338 strcpy(val, comstring->s); 339 cs = val; 340 extrap = NULL; 341 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 342 if (extrap == NULL) { 343 *p = '\0'; 344 extrap = p + 1; 345 } 346 cs = p + 1; 347 argc++; 348 } 349 350 argv = alloca((8 + argc) * sizeof(char *)); 351 argv[0] = _PATH_IFCONFIG; 352 if ((cs = strchr(val, '|'))) { 353 argv[1] = acs = alloca(cs - val + 1); 354 strlcpy(acs, val, cs - val + 1); 355 addr = cs + 1; 356 } else { 357 argv[1] = string_param(j->intparams[IP_INTERFACE]); 358 addr = val; 359 } 360 argv[2] = "inet"; 361 if (!(cs = strchr(addr, '/'))) { 362 argv[3] = addr; 363 argv[4] = "netmask"; 364 argv[5] = "255.255.255.255"; 365 argc = 6; 366 } else if (strchr(cs + 1, '.')) { 367 argv[3] = acs = alloca(cs - addr + 1); 368 strlcpy(acs, addr, cs - addr + 1); 369 argv[4] = "netmask"; 370 argv[5] = cs + 1; 371 argc = 6; 372 } else { 373 argv[3] = addr; 374 argc = 4; 375 } 376 377 if (!down && extrap != NULL) { 378 for (cs = strtok(extrap, " "); cs; 379 cs = strtok(NULL, " ")) { 380 size_t len = strlen(cs) + 1; 381 argv[argc++] = acs = alloca(len); 382 strlcpy(acs, cs, len); 383 } 384 } 385 386 argv[argc] = down ? "-alias" : "alias"; 387 argv[argc + 1] = NULL; 388 break; 389#endif 390 391#ifdef INET6 392 case IP__IP6_IFADDR: 393 argc = 0; 394 val = alloca(strlen(comstring->s) + 1); 395 strcpy(val, comstring->s); 396 cs = val; 397 extrap = NULL; 398 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 399 if (extrap == NULL) { 400 *p = '\0'; 401 extrap = p + 1; 402 } 403 cs = p + 1; 404 argc++; 405 } 406 407 argv = alloca((8 + argc) * sizeof(char *)); 408 argv[0] = _PATH_IFCONFIG; 409 if ((cs = strchr(val, '|'))) { 410 argv[1] = acs = alloca(cs - val + 1); 411 strlcpy(acs, val, cs - val + 1); 412 addr = cs + 1; 413 } else { 414 argv[1] = string_param(j->intparams[IP_INTERFACE]); 415 addr = val; 416 } 417 argv[2] = "inet6"; 418 argv[3] = addr; 419 if (!(cs = strchr(addr, '/'))) { 420 argv[4] = "prefixlen"; 421 argv[5] = "128"; 422 argc = 6; 423 } else 424 argc = 4; 425 426 if (!down) { 427 for (cs = strtok(extrap, " "); cs; 428 cs = strtok(NULL, " ")) { 429 size_t len = strlen(cs) + 1; 430 argv[argc++] = acs = alloca(len); 431 strlcpy(acs, cs, len); 432 } 433 } 434 435 argv[argc] = down ? "-alias" : "alias"; 436 argv[argc + 1] = NULL; 437 break; 438#endif 439 440 case IP_VNET_INTERFACE: 441 argv = alloca(5 * sizeof(char *)); 442 argv[0] = _PATH_IFCONFIG; 443 argv[1] = comstring->s; 444 argv[2] = down ? "-vnet" : "vnet"; 445 jidstr = string_param(j->intparams[KP_JID]); 446 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 447 argv[4] = NULL; 448 break; 449 450 case IP_MOUNT: 451 case IP__MOUNT_FROM_FSTAB: 452 argv = alloca(8 * sizeof(char *)); 453 comcs = alloca(comstring->len + 1); 454 strcpy(comcs, comstring->s); 455 argc = 0; 456 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 457 cs = strtok(NULL, " \t\f\v\r\n")) { 458 if (argc <= 1 && strunvis(cs, cs) < 0) { 459 jail_warnx(j, "%s: %s: fstab parse error", 460 j->intparams[comparam]->name, comstring->s); 461 return -1; 462 } 463 argv[argc++] = cs; 464 } 465 if (argc == 0) 466 return 0; 467 if (argc < 3) { 468 jail_warnx(j, "%s: %s: missing information", 469 j->intparams[comparam]->name, comstring->s); 470 return -1; 471 } 472 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 473 down ? argv[2] : NULL) < 0) 474 return -1; 475 if (down) { 476 argv[4] = NULL; 477 argv[3] = argv[1]; 478 argv[0] = "/sbin/umount"; 479 } else { 480 if (argc == 4) { 481 argv[7] = NULL; 482 argv[6] = argv[1]; 483 argv[5] = argv[0]; 484 argv[4] = argv[3]; 485 argv[3] = "-o"; 486 } else { 487 argv[5] = NULL; 488 argv[4] = argv[1]; 489 argv[3] = argv[0]; 490 } 491 argv[0] = _PATH_MOUNT; 492 } 493 argv[1] = "-t"; 494 break; 495 496 case IP_MOUNT_DEVFS: 497 argv = alloca(7 * sizeof(char *)); 498 path = string_param(j->intparams[KP_PATH]); 499 if (path == NULL) { 500 jail_warnx(j, "mount.devfs: no jail root path defined"); 501 return -1; 502 } 503 devpath = alloca(strlen(path) + 5); 504 sprintf(devpath, "%s/dev", path); 505 if (check_path(j, "mount.devfs", devpath, 0, 506 down ? "devfs" : NULL) < 0) 507 return -1; 508 if (down) { 509 argv[0] = "/sbin/umount"; 510 argv[1] = devpath; 511 argv[2] = NULL; 512 } else { 513 argv[0] = _PATH_MOUNT; 514 argv[1] = "-t"; 515 argv[2] = "devfs"; 516 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 517 if (!ruleset) 518 ruleset = "4"; /* devfsrules_jail */ 519 argv[3] = acs = alloca(11 + strlen(ruleset)); 520 sprintf(acs, "-oruleset=%s", ruleset); 521 argv[4] = "."; 522 argv[5] = devpath; 523 argv[6] = NULL; 524 } 525 break; 526 527 case IP_MOUNT_FDESCFS: 528 argv = alloca(7 * sizeof(char *)); 529 path = string_param(j->intparams[KP_PATH]); 530 if (path == NULL) { 531 jail_warnx(j, "mount.fdescfs: no jail root path defined"); 532 return -1; 533 } 534 devpath = alloca(strlen(path) + 8); 535 sprintf(devpath, "%s/dev/fd", path); 536 if (check_path(j, "mount.fdescfs", devpath, 0, 537 down ? "fdescfs" : NULL) < 0) 538 return -1; 539 if (down) { 540 argv[0] = "/sbin/umount"; 541 argv[1] = devpath; 542 argv[2] = NULL; 543 } else { 544 argv[0] = _PATH_MOUNT; 545 argv[1] = "-t"; 546 argv[2] = "fdescfs"; 547 argv[3] = "."; 548 argv[4] = devpath; 549 argv[5] = NULL; 550 } 551 break; 552 553 case IP_MOUNT_PROCFS: 554 argv = alloca(7 * sizeof(char *)); 555 path = string_param(j->intparams[KP_PATH]); 556 if (path == NULL) { 557 jail_warnx(j, "mount.procfs: no jail root path defined"); 558 return -1; 559 } 560 devpath = alloca(strlen(path) + 6); 561 sprintf(devpath, "%s/proc", path); 562 if (check_path(j, "mount.procfs", devpath, 0, 563 down ? "procfs" : NULL) < 0) 564 return -1; 565 if (down) { 566 argv[0] = "/sbin/umount"; 567 argv[1] = devpath; 568 argv[2] = NULL; 569 } else { 570 argv[0] = _PATH_MOUNT; 571 argv[1] = "-t"; 572 argv[2] = "procfs"; 573 argv[3] = "."; 574 argv[4] = devpath; 575 argv[5] = NULL; 576 } 577 break; 578 579 case IP_COMMAND: 580 if (j->name != NULL) 581 goto default_command; 582 argc = 0; 583 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 584 argc++; 585 argv = alloca((argc + 1) * sizeof(char *)); 586 argc = 0; 587 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 588 argv[argc++] = s->s; 589 argv[argc] = NULL; 590 j->comstring = &dummystring; 591 break; 592 593 default: 594 default_command: 595 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 596 !(cs[0] == '&' && cs[1] == '\0')) { 597 argv = alloca(4 * sizeof(char *)); 598 argv[0] = _PATH_BSHELL; 599 argv[1] = "-c"; 600 argv[2] = comstring->s; 601 argv[3] = NULL; 602 } else { 603 if (cs) { 604 *cs = 0; 605 bg = 1; 606 } 607 comcs = alloca(comstring->len + 1); 608 strcpy(comcs, comstring->s); 609 argc = 0; 610 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 611 cs = strtok(NULL, " \t\f\v\r\n")) 612 argc++; 613 argv = alloca((argc + 1) * sizeof(char *)); 614 strcpy(comcs, comstring->s); 615 argc = 0; 616 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 617 cs = strtok(NULL, " \t\f\v\r\n")) 618 argv[argc++] = cs; 619 argv[argc] = NULL; 620 } 621 } 622 if (argv[0] == NULL) 623 return 0; 624 625 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 626 timeout != 0) { 627 clock_gettime(CLOCK_REALTIME, &j->timeout); 628 j->timeout.tv_sec += timeout; 629 } else 630 j->timeout.tv_sec = 0; 631 632 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 633 comparam == IP_EXEC_STOP; 634 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 635 username = string_param(j->intparams[injail 636 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 637 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 638 639 consfd = 0; 640 if (injail && 641 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 642 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 643 return -1; 644 consfd = 645 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 646 if (consfd < 0) { 647 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 648 return -1; 649 } 650 } 651 652 comlen = 0; 653 for (i = 0; argv[i]; i++) 654 comlen += strlen(argv[i]) + 1; 655 j->comline = cs = emalloc(comlen); 656 for (i = 0; argv[i]; i++) { 657 strcpy(cs, argv[i]); 658 if (argv[i + 1]) { 659 cs += strlen(argv[i]) + 1; 660 cs[-1] = ' '; 661 } 662 } 663 if (verbose > 0) 664 jail_note(j, "run command%s%s%s: %s\n", 665 injail ? " in jail" : "", username ? " as " : "", 666 username ? username : "", j->comline); 667 668 pid = fork(); 669 if (pid < 0) 670 err(1, "fork"); 671 if (pid > 0) { 672 if (bg || !add_proc(j, pid)) { 673 free(j->comline); 674 j->comline = NULL; 675 return 0; 676 } else { 677 paralimit--; 678 return 1; 679 } 680 } 681 if (bg) 682 setsid(); 683 684 /* Set up the environment and run the command */ 685 pwd = NULL; 686 lcap = NULL; 687 if ((clean || username) && injail && sjuser && 688 get_user_info(j, username, &pwd, &lcap) < 0) 689 exit(1); 690 if (injail) { 691 /* jail_attach won't chdir along with its chroot. */ 692 path = string_param(j->intparams[KP_PATH]); 693 if (path && chdir(path) < 0) { 694 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 695 exit(1); 696 } 697 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 698 setfib(fib) < 0) { 699 jail_warnx(j, "setfib: %s", strerror(errno)); 700 exit(1); 701 } 702 if (jail_attach(j->jid) < 0) { 703 jail_warnx(j, "jail_attach: %s", strerror(errno)); 704 exit(1); 705 } 706 } 707 if (clean || username) { 708 if (!(injail && sjuser) && 709 get_user_info(j, username, &pwd, &lcap) < 0) 710 exit(1); 711 if (clean) { 712 term = getenv("TERM"); 713 environ = &cleanenv; 714 setenv("PATH", "/bin:/usr/bin", 0); 715 if (term != NULL) 716 setenv("TERM", term, 1); 717 } 718 if (setgid(pwd->pw_gid) < 0) { 719 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 720 strerror(errno)); 721 exit(1); 722 } 723 if (setusercontext(lcap, pwd, pwd->pw_uid, username 724 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 725 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 726 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 727 strerror(errno)); 728 exit(1); 729 } 730 login_close(lcap); 731 setenv("USER", pwd->pw_name, 1); 732 setenv("HOME", pwd->pw_dir, 1); 733 setenv("SHELL", 734 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 735 if (clean && chdir(pwd->pw_dir) < 0) { 736 jail_warnx(j, "chdir %s: %s", 737 pwd->pw_dir, strerror(errno)); 738 exit(1); 739 } 740 endpwent(); 741 } 742 743 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 744 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 745 exit(1); 746 } 747 closefrom(3); 748 execvp(argv[0], __DECONST(char *const*, argv)); 749 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 750 exit(1); 751} 752 753/* 754 * Add a process to the hash, tied to a jail. 755 */ 756static int 757add_proc(struct cfjail *j, pid_t pid) 758{ 759 struct kevent ke; 760 struct cfjail *tj; 761 struct phash *ph; 762 763 if (!kq && (kq = kqueue()) < 0) 764 err(1, "kqueue"); 765 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 766 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 767 if (errno == ESRCH) 768 return 0; 769 err(1, "kevent"); 770 } 771 ph = emalloc(sizeof(struct phash)); 772 ph->j = j; 773 ph->pid = pid; 774 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 775 j->nprocs++; 776 j->flags |= JF_SLEEPQ; 777 if (j->timeout.tv_sec == 0) 778 requeue(j, &sleeping); 779 else { 780 /* File the jail in the sleep queue according to its timeout. */ 781 TAILQ_REMOVE(j->queue, j, tq); 782 TAILQ_FOREACH(tj, &sleeping, tq) { 783 if (!tj->timeout.tv_sec || 784 j->timeout.tv_sec < tj->timeout.tv_sec || 785 (j->timeout.tv_sec == tj->timeout.tv_sec && 786 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 787 TAILQ_INSERT_BEFORE(tj, j, tq); 788 break; 789 } 790 } 791 if (tj == NULL) 792 TAILQ_INSERT_TAIL(&sleeping, j, tq); 793 j->queue = &sleeping; 794 } 795 return 1; 796} 797 798/* 799 * Remove any processes from the hash that correspond to a jail. 800 */ 801static void 802clear_procs(struct cfjail *j) 803{ 804 struct kevent ke; 805 struct phash *ph, *tph; 806 int i; 807 808 j->nprocs = 0; 809 for (i = 0; i < PHASH_SIZE; i++) 810 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 811 if (ph->j == j) { 812 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 813 NOTE_EXIT, 0, NULL); 814 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 815 LIST_REMOVE(ph, le); 816 free(ph); 817 } 818} 819 820/* 821 * Find the jail that corresponds to an exited process. 822 */ 823static struct cfjail * 824find_proc(pid_t pid) 825{ 826 struct cfjail *j; 827 struct phash *ph; 828 829 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 830 if (ph->pid == pid) { 831 j = ph->j; 832 LIST_REMOVE(ph, le); 833 free(ph); 834 return --j->nprocs ? NULL : j; 835 } 836 return NULL; 837} 838 839/* 840 * Send SIGTERM to all processes in a jail and wait for them to die. 841 */ 842static int 843term_procs(struct cfjail *j) 844{ 845 struct kinfo_proc *ki; 846 int i, noted, pcnt, timeout; 847 848 static kvm_t *kd; 849 850 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 851 timeout = DEFAULT_STOP_TIMEOUT; 852 else if (timeout == 0) 853 return 0; 854 855 if (kd == NULL) { 856 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 857 if (kd == NULL) 858 return 0; 859 } 860 861 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 862 if (ki == NULL) 863 return 0; 864 noted = 0; 865 for (i = 0; i < pcnt; i++) 866 if (ki[i].ki_jid == j->jid && 867 kill(ki[i].ki_pid, SIGTERM) == 0) { 868 (void)add_proc(j, ki[i].ki_pid); 869 if (verbose > 0) { 870 if (!noted) { 871 noted = 1; 872 jail_note(j, "sent SIGTERM to:"); 873 } 874 printf(" %d", ki[i].ki_pid); 875 } 876 } 877 if (noted) 878 printf("\n"); 879 if (j->nprocs > 0) { 880 clock_gettime(CLOCK_REALTIME, &j->timeout); 881 j->timeout.tv_sec += timeout; 882 return 1; 883 } 884 return 0; 885} 886 887/* 888 * Look up a user in the passwd and login.conf files. 889 */ 890static int 891get_user_info(struct cfjail *j, const char *username, 892 const struct passwd **pwdp, login_cap_t **lcapp) 893{ 894 const struct passwd *pwd; 895 896 errno = 0; 897 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 898 if (pwd == NULL) { 899 if (errno) 900 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 901 username ? username : "", strerror(errno)); 902 else if (username) 903 jail_warnx(j, "%s: no such user", username); 904 else 905 jail_warnx(j, "unknown uid %d", getuid()); 906 return -1; 907 } 908 *lcapp = login_getpwclass(pwd); 909 if (*lcapp == NULL) { 910 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 911 strerror(errno)); 912 return -1; 913 } 914 /* Set the groups while the group file is still available */ 915 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 916 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 917 strerror(errno)); 918 return -1; 919 } 920 return 0; 921} 922 923/* 924 * Make sure a mount or consolelog path is a valid absolute pathname 925 * with no symlinks. 926 */ 927static int 928check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 929 const char *umount_type) 930{ 931 struct stat st, mpst; 932 struct statfs stfs; 933 char *tpath, *p; 934 const char *jailpath; 935 size_t jplen; 936 937 if (path[0] != '/') { 938 jail_warnx(j, "%s: %s: not an absolute pathname", 939 pname, path); 940 return -1; 941 } 942 /* 943 * Only check for symlinks in components below the jail's path, 944 * since that's where the security risk lies. 945 */ 946 jailpath = string_param(j->intparams[KP_PATH]); 947 if (jailpath == NULL) 948 jailpath = ""; 949 jplen = strlen(jailpath); 950 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 951 tpath = alloca(strlen(path) + 1); 952 strcpy(tpath, path); 953 for (p = tpath + jplen; p != NULL; ) { 954 p = strchr(p + 1, '/'); 955 if (p) 956 *p = '\0'; 957 if (lstat(tpath, &st) < 0) { 958 if (errno == ENOENT && isfile && !p) 959 break; 960 jail_warnx(j, "%s: %s: %s", pname, tpath, 961 strerror(errno)); 962 return -1; 963 } 964 if (S_ISLNK(st.st_mode)) { 965 jail_warnx(j, "%s: %s is a symbolic link", 966 pname, tpath); 967 return -1; 968 } 969 if (p) 970 *p = '/'; 971 } 972 } 973 if (umount_type != NULL) { 974 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 975 jail_warnx(j, "%s: %s: %s", pname, path, 976 strerror(errno)); 977 return -1; 978 } 979 if (stat(stfs.f_mntonname, &mpst) < 0) { 980 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 981 strerror(errno)); 982 return -1; 983 } 984 if (st.st_ino != mpst.st_ino) { 985 jail_warnx(j, "%s: %s: not a mount point", 986 pname, path); 987 return -1; 988 } 989 if (strcmp(stfs.f_fstypename, umount_type)) { 990 jail_warnx(j, "%s: %s: not a %s mount", 991 pname, path, umount_type); 992 return -1; 993 } 994 } 995 return 0; 996} 997