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("$FreeBSD$"); 31 32#include <sys/types.h> 33#include <sys/cpuset.h> 34#include <sys/event.h> 35#include <sys/mount.h> 36#include <sys/stat.h> 37#include <sys/sysctl.h> 38#include <sys/user.h> 39#include <sys/wait.h> 40 41#include <err.h> 42#include <errno.h> 43#include <fcntl.h> 44#include <kvm.h> 45#include <login_cap.h> 46#include <paths.h> 47#include <pwd.h> 48#include <signal.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#include <unistd.h> 53#include <vis.h> 54 55#include "jailp.h" 56 57#define DEFAULT_STOP_TIMEOUT 10 58#define PHASH_SIZE 256 59 60LIST_HEAD(phhead, phash); 61 62struct phash { 63 LIST_ENTRY(phash) le; 64 struct cfjail *j; 65 pid_t pid; 66}; 67 68int paralimit = -1; 69 70extern char **environ; 71 72static int run_command(struct cfjail *j); 73static int add_proc(struct cfjail *j, pid_t pid); 74static void clear_procs(struct cfjail *j); 75static struct cfjail *find_proc(pid_t pid); 76static int term_procs(struct cfjail *j); 77static int get_user_info(struct cfjail *j, const char *username, 78 const struct passwd **pwdp, login_cap_t **lcapp); 79static int check_path(struct cfjail *j, const char *pname, const char *path, 80 int isfile, const char *umount_type); 81 82static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 83static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 84static struct cfstring dummystring = { .len = 1 }; 85static struct phhead phash[PHASH_SIZE]; 86static int kq; 87 88static cpusetid_t 89root_cpuset_id(void) 90{ 91 static cpusetid_t setid = CPUSET_INVALID; 92 static int error; 93 94 /* Only try to get the cpuset once. */ 95 if (error == 0 && setid == CPUSET_INVALID) 96 error = cpuset_getid(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1, &setid); 97 if (error != 0) 98 return (CPUSET_INVALID); 99 return (setid); 100} 101 102/* 103 * Run the next command associated with a jail. 104 */ 105int 106next_command(struct cfjail *j) 107{ 108 enum intparam comparam; 109 int create_failed, stopping; 110 111 if (paralimit == 0) { 112 if (j->flags & JF_FROM_RUNQ) 113 requeue_head(j, &runnable); 114 else 115 requeue(j, &runnable); 116 return 1; 117 } 118 j->flags &= ~JF_FROM_RUNQ; 119 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 120 stopping = (j->flags & JF_STOP) != 0; 121 comparam = *j->comparam; 122 for (;;) { 123 if (j->comstring == NULL) { 124 j->comparam += create_failed ? -1 : 1; 125 switch ((comparam = *j->comparam)) { 126 case IP__NULL: 127 return 0; 128 case IP_MOUNT_DEVFS: 129 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 130 continue; 131 j->comstring = &dummystring; 132 break; 133 case IP_MOUNT_FDESCFS: 134 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 135 continue; 136 j->comstring = &dummystring; 137 break; 138 case IP_MOUNT_PROCFS: 139 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 140 continue; 141 j->comstring = &dummystring; 142 break; 143 case IP__OP: 144 case IP_STOP_TIMEOUT: 145 j->comstring = &dummystring; 146 break; 147 default: 148 if (j->intparams[comparam] == NULL) 149 continue; 150 j->comstring = create_failed || (stopping && 151 (j->intparams[comparam]->flags & PF_REV)) 152 ? TAILQ_LAST(&j->intparams[comparam]->val, 153 cfstrings) 154 : TAILQ_FIRST(&j->intparams[comparam]->val); 155 } 156 } else { 157 j->comstring = j->comstring == &dummystring ? NULL : 158 create_failed || (stopping && 159 (j->intparams[comparam]->flags & PF_REV)) 160 ? TAILQ_PREV(j->comstring, cfstrings, tq) 161 : TAILQ_NEXT(j->comstring, tq); 162 } 163 if (j->comstring == NULL || j->comstring->len == 0 || 164 (create_failed && (comparam == IP_EXEC_PRESTART || 165 comparam == IP_EXEC_CREATED || comparam == IP_EXEC_START || 166 comparam == IP_COMMAND || comparam == IP_EXEC_POSTSTART || 167 comparam == IP_EXEC_PREPARE))) 168 continue; 169 switch (run_command(j)) { 170 case -1: 171 failed(j); 172 /* FALLTHROUGH */ 173 case 1: 174 return 1; 175 } 176 } 177} 178 179/* 180 * Check command exit status 181 */ 182int 183finish_command(struct cfjail *j) 184{ 185 struct cfjail *rj; 186 int error; 187 188 if (!(j->flags & JF_SLEEPQ)) 189 return 0; 190 j->flags &= ~JF_SLEEPQ; 191 if (*j->comparam == IP_STOP_TIMEOUT) { 192 j->flags &= ~JF_TIMEOUT; 193 j->pstatus = 0; 194 return 0; 195 } 196 paralimit++; 197 if (!TAILQ_EMPTY(&runnable)) { 198 rj = TAILQ_FIRST(&runnable); 199 rj->flags |= JF_FROM_RUNQ; 200 requeue(rj, &ready); 201 } 202 error = 0; 203 if (j->flags & JF_TIMEOUT) { 204 j->flags &= ~JF_TIMEOUT; 205 if (*j->comparam != IP_STOP_TIMEOUT) { 206 jail_warnx(j, "%s: timed out", j->comline); 207 failed(j); 208 error = -1; 209 } else if (verbose > 0) 210 jail_note(j, "timed out\n"); 211 } else if (j->pstatus != 0) { 212 if (WIFSIGNALED(j->pstatus)) 213 jail_warnx(j, "%s: exited on signal %d", 214 j->comline, WTERMSIG(j->pstatus)); 215 else 216 jail_warnx(j, "%s: failed", j->comline); 217 j->pstatus = 0; 218 failed(j); 219 error = -1; 220 } 221 free(j->comline); 222 j->comline = NULL; 223 return error; 224} 225 226/* 227 * Check for finished processes or timeouts. 228 */ 229struct cfjail * 230next_proc(int nonblock) 231{ 232 struct kevent ke; 233 struct timespec ts; 234 struct timespec *tsp; 235 struct cfjail *j; 236 237 if (!TAILQ_EMPTY(&sleeping)) { 238 again: 239 tsp = NULL; 240 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 241 clock_gettime(CLOCK_REALTIME, &ts); 242 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 243 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 244 if (ts.tv_nsec < 0) { 245 ts.tv_sec--; 246 ts.tv_nsec += 1000000000; 247 } 248 if (ts.tv_sec < 0 || 249 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 250 j->flags |= JF_TIMEOUT; 251 clear_procs(j); 252 return j; 253 } 254 tsp = &ts; 255 } 256 if (nonblock) { 257 ts.tv_sec = 0; 258 ts.tv_nsec = 0; 259 tsp = &ts; 260 } 261 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 262 case -1: 263 if (errno != EINTR) 264 err(1, "kevent"); 265 goto again; 266 case 0: 267 if (!nonblock) { 268 j = TAILQ_FIRST(&sleeping); 269 j->flags |= JF_TIMEOUT; 270 clear_procs(j); 271 return j; 272 } 273 break; 274 case 1: 275 (void)waitpid(ke.ident, NULL, WNOHANG); 276 if ((j = find_proc(ke.ident))) { 277 j->pstatus = ke.data; 278 return j; 279 } 280 goto again; 281 } 282 } 283 return NULL; 284} 285 286/* 287 * Run a single command for a jail, possibly inside the jail. 288 */ 289static int 290run_command(struct cfjail *j) 291{ 292 const struct passwd *pwd; 293 const struct cfstring *comstring, *s; 294 login_cap_t *lcap; 295 const char **argv; 296 char *acs, *cs, *comcs, *devpath; 297 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 298 enum intparam comparam; 299 size_t comlen; 300 pid_t pid; 301 cpusetid_t setid; 302 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 303#if defined(INET) || defined(INET6) 304 char *addr, *extrap, *p, *val; 305#endif 306 307 static char *cleanenv; 308 309 /* Perform some operations that aren't actually commands */ 310 comparam = *j->comparam; 311 down = j->flags & (JF_STOP | JF_FAILED); 312 switch (comparam) { 313 case IP_STOP_TIMEOUT: 314 return term_procs(j); 315 316 case IP__OP: 317 if (down) { 318 if (jail_remove(j->jid) < 0 && errno == EPERM) { 319 jail_warnx(j, "jail_remove: %s", 320 strerror(errno)); 321 return -1; 322 } 323 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 324 ? note_remove : j->name != NULL))) 325 jail_note(j, "removed\n"); 326 j->jid = -1; 327 if (j->flags & JF_STOP) 328 dep_done(j, DF_LIGHT); 329 else 330 j->flags &= ~JF_PERSIST; 331 } else { 332 if (create_jail(j) < 0) 333 return -1; 334 if (iflag) 335 printf("%d\n", j->jid); 336 if (verbose >= 0 && (j->name || verbose > 0)) 337 jail_note(j, "created\n"); 338 dep_done(j, DF_LIGHT); 339 } 340 return 0; 341 342 default: ; 343 } 344 /* 345 * Collect exec arguments. Internal commands for network and 346 * mounting build their own argument lists. 347 */ 348 comstring = j->comstring; 349 bg = 0; 350 switch (comparam) { 351#ifdef INET 352 case IP__IP4_IFADDR: 353 argc = 0; 354 val = alloca(strlen(comstring->s) + 1); 355 strcpy(val, comstring->s); 356 cs = val; 357 extrap = NULL; 358 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 359 if (extrap == NULL) { 360 *p = '\0'; 361 extrap = p + 1; 362 } 363 cs = p + 1; 364 argc++; 365 } 366 367 argv = alloca((8 + argc) * sizeof(char *)); 368 argv[0] = _PATH_IFCONFIG; 369 if ((cs = strchr(val, '|'))) { 370 argv[1] = acs = alloca(cs - val + 1); 371 strlcpy(acs, val, cs - val + 1); 372 addr = cs + 1; 373 } else { 374 argv[1] = string_param(j->intparams[IP_INTERFACE]); 375 addr = val; 376 } 377 argv[2] = "inet"; 378 if (!(cs = strchr(addr, '/'))) { 379 argv[3] = addr; 380 argv[4] = "netmask"; 381 argv[5] = "255.255.255.255"; 382 argc = 6; 383 } else if (strchr(cs + 1, '.')) { 384 argv[3] = acs = alloca(cs - addr + 1); 385 strlcpy(acs, addr, cs - addr + 1); 386 argv[4] = "netmask"; 387 argv[5] = cs + 1; 388 argc = 6; 389 } else { 390 argv[3] = addr; 391 argc = 4; 392 } 393 394 if (!down && extrap != NULL) { 395 for (cs = strtok(extrap, " "); cs; 396 cs = strtok(NULL, " ")) { 397 size_t len = strlen(cs) + 1; 398 argv[argc++] = acs = alloca(len); 399 strlcpy(acs, cs, len); 400 } 401 } 402 403 argv[argc] = down ? "-alias" : "alias"; 404 argv[argc + 1] = NULL; 405 break; 406#endif 407 408#ifdef INET6 409 case IP__IP6_IFADDR: 410 argc = 0; 411 val = alloca(strlen(comstring->s) + 1); 412 strcpy(val, comstring->s); 413 cs = val; 414 extrap = NULL; 415 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 416 if (extrap == NULL) { 417 *p = '\0'; 418 extrap = p + 1; 419 } 420 cs = p + 1; 421 argc++; 422 } 423 424 argv = alloca((8 + argc) * sizeof(char *)); 425 argv[0] = _PATH_IFCONFIG; 426 if ((cs = strchr(val, '|'))) { 427 argv[1] = acs = alloca(cs - val + 1); 428 strlcpy(acs, val, cs - val + 1); 429 addr = cs + 1; 430 } else { 431 argv[1] = string_param(j->intparams[IP_INTERFACE]); 432 addr = val; 433 } 434 argv[2] = "inet6"; 435 argv[3] = addr; 436 if (!(cs = strchr(addr, '/'))) { 437 argv[4] = "prefixlen"; 438 argv[5] = "128"; 439 argc = 6; 440 } else 441 argc = 4; 442 443 if (!down) { 444 for (cs = strtok(extrap, " "); cs; 445 cs = strtok(NULL, " ")) { 446 size_t len = strlen(cs) + 1; 447 argv[argc++] = acs = alloca(len); 448 strlcpy(acs, cs, len); 449 } 450 } 451 452 argv[argc] = down ? "-alias" : "alias"; 453 argv[argc + 1] = NULL; 454 break; 455#endif 456 457 case IP_VNET_INTERFACE: 458 argv = alloca(5 * sizeof(char *)); 459 argv[0] = _PATH_IFCONFIG; 460 argv[1] = comstring->s; 461 argv[2] = down ? "-vnet" : "vnet"; 462 jidstr = string_param(j->intparams[KP_JID]); 463 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 464 argv[4] = NULL; 465 break; 466 467 case IP_MOUNT: 468 case IP__MOUNT_FROM_FSTAB: 469 argv = alloca(8 * sizeof(char *)); 470 comcs = alloca(comstring->len + 1); 471 strcpy(comcs, comstring->s); 472 argc = 0; 473 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 474 cs = strtok(NULL, " \t\f\v\r\n")) { 475 if (argc <= 1 && strunvis(cs, cs) < 0) { 476 jail_warnx(j, "%s: %s: fstab parse error", 477 j->intparams[comparam]->name, comstring->s); 478 return -1; 479 } 480 argv[argc++] = cs; 481 } 482 if (argc == 0) 483 return 0; 484 if (argc < 3) { 485 jail_warnx(j, "%s: %s: missing information", 486 j->intparams[comparam]->name, comstring->s); 487 return -1; 488 } 489 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 490 down ? argv[2] : NULL) < 0) 491 return -1; 492 if (down) { 493 argv[4] = NULL; 494 argv[3] = argv[1]; 495 argv[0] = "/sbin/umount"; 496 } else { 497 if (argc == 4) { 498 argv[7] = NULL; 499 argv[6] = argv[1]; 500 argv[5] = argv[0]; 501 argv[4] = argv[3]; 502 argv[3] = "-o"; 503 } else { 504 argv[5] = NULL; 505 argv[4] = argv[1]; 506 argv[3] = argv[0]; 507 } 508 argv[0] = _PATH_MOUNT; 509 } 510 argv[1] = "-t"; 511 break; 512 513 case IP_MOUNT_DEVFS: 514 argv = alloca(7 * sizeof(char *)); 515 path = string_param(j->intparams[KP_PATH]); 516 if (path == NULL) { 517 jail_warnx(j, "mount.devfs: no jail root path defined"); 518 return -1; 519 } 520 devpath = alloca(strlen(path) + 5); 521 sprintf(devpath, "%s/dev", path); 522 if (check_path(j, "mount.devfs", devpath, 0, 523 down ? "devfs" : NULL) < 0) 524 return -1; 525 if (down) { 526 argv[0] = "/sbin/umount"; 527 argv[1] = devpath; 528 argv[2] = NULL; 529 } else { 530 argv[0] = _PATH_MOUNT; 531 argv[1] = "-t"; 532 argv[2] = "devfs"; 533 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 534 if (!ruleset) 535 ruleset = "4"; /* devfsrules_jail */ 536 argv[3] = acs = alloca(11 + strlen(ruleset)); 537 sprintf(acs, "-oruleset=%s", ruleset); 538 argv[4] = "."; 539 argv[5] = devpath; 540 argv[6] = NULL; 541 } 542 break; 543 544 case IP_MOUNT_FDESCFS: 545 argv = alloca(7 * sizeof(char *)); 546 path = string_param(j->intparams[KP_PATH]); 547 if (path == NULL) { 548 jail_warnx(j, "mount.fdescfs: no jail root path defined"); 549 return -1; 550 } 551 devpath = alloca(strlen(path) + 8); 552 sprintf(devpath, "%s/dev/fd", path); 553 if (check_path(j, "mount.fdescfs", devpath, 0, 554 down ? "fdescfs" : NULL) < 0) 555 return -1; 556 if (down) { 557 argv[0] = "/sbin/umount"; 558 argv[1] = devpath; 559 argv[2] = NULL; 560 } else { 561 argv[0] = _PATH_MOUNT; 562 argv[1] = "-t"; 563 argv[2] = "fdescfs"; 564 argv[3] = "."; 565 argv[4] = devpath; 566 argv[5] = NULL; 567 } 568 break; 569 570 case IP_MOUNT_PROCFS: 571 argv = alloca(7 * sizeof(char *)); 572 path = string_param(j->intparams[KP_PATH]); 573 if (path == NULL) { 574 jail_warnx(j, "mount.procfs: no jail root path defined"); 575 return -1; 576 } 577 devpath = alloca(strlen(path) + 6); 578 sprintf(devpath, "%s/proc", path); 579 if (check_path(j, "mount.procfs", devpath, 0, 580 down ? "procfs" : NULL) < 0) 581 return -1; 582 if (down) { 583 argv[0] = "/sbin/umount"; 584 argv[1] = devpath; 585 argv[2] = NULL; 586 } else { 587 argv[0] = _PATH_MOUNT; 588 argv[1] = "-t"; 589 argv[2] = "procfs"; 590 argv[3] = "."; 591 argv[4] = devpath; 592 argv[5] = NULL; 593 } 594 break; 595 596 case IP_COMMAND: 597 if (j->name != NULL) 598 goto default_command; 599 argc = 0; 600 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 601 argc++; 602 argv = alloca((argc + 1) * sizeof(char *)); 603 argc = 0; 604 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 605 argv[argc++] = s->s; 606 argv[argc] = NULL; 607 j->comstring = &dummystring; 608 break; 609 610 default: 611 default_command: 612 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 613 !(cs[0] == '&' && cs[1] == '\0')) { 614 argv = alloca(4 * sizeof(char *)); 615 argv[0] = _PATH_BSHELL; 616 argv[1] = "-c"; 617 argv[2] = comstring->s; 618 argv[3] = NULL; 619 } else { 620 if (cs) { 621 *cs = 0; 622 bg = 1; 623 } 624 comcs = alloca(comstring->len + 1); 625 strcpy(comcs, comstring->s); 626 argc = 0; 627 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 628 cs = strtok(NULL, " \t\f\v\r\n")) 629 argc++; 630 argv = alloca((argc + 1) * sizeof(char *)); 631 strcpy(comcs, comstring->s); 632 argc = 0; 633 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 634 cs = strtok(NULL, " \t\f\v\r\n")) 635 argv[argc++] = cs; 636 argv[argc] = NULL; 637 } 638 } 639 if (argv[0] == NULL) 640 return 0; 641 642 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 643 timeout != 0) { 644 clock_gettime(CLOCK_REALTIME, &j->timeout); 645 j->timeout.tv_sec += timeout; 646 } else 647 j->timeout.tv_sec = 0; 648 649 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 650 comparam == IP_EXEC_STOP; 651 if (injail) 652 setid = root_cpuset_id(); 653 else 654 setid = CPUSET_INVALID; 655 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 656 username = string_param(j->intparams[injail 657 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 658 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 659 660 consfd = 0; 661 if (injail && 662 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 663 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 664 return -1; 665 consfd = 666 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 667 if (consfd < 0) { 668 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 669 return -1; 670 } 671 } 672 673 comlen = 0; 674 for (i = 0; argv[i]; i++) 675 comlen += strlen(argv[i]) + 1; 676 j->comline = cs = emalloc(comlen); 677 for (i = 0; argv[i]; i++) { 678 strcpy(cs, argv[i]); 679 if (argv[i + 1]) { 680 cs += strlen(argv[i]) + 1; 681 cs[-1] = ' '; 682 } 683 } 684 if (verbose > 0) 685 jail_note(j, "run command%s%s%s: %s\n", 686 injail ? " in jail" : "", username ? " as " : "", 687 username ? username : "", j->comline); 688 689 pid = fork(); 690 if (pid < 0) 691 err(1, "fork"); 692 if (pid > 0) { 693 if (bg || !add_proc(j, pid)) { 694 free(j->comline); 695 j->comline = NULL; 696 return 0; 697 } else { 698 paralimit--; 699 return 1; 700 } 701 } 702 if (bg) 703 setsid(); 704 705 /* Set up the environment and run the command */ 706 pwd = NULL; 707 lcap = NULL; 708 if ((clean || username) && injail && sjuser && 709 get_user_info(j, username, &pwd, &lcap) < 0) 710 exit(1); 711 if (injail) { 712 /* jail_attach won't chdir along with its chroot. */ 713 path = string_param(j->intparams[KP_PATH]); 714 if (path && chdir(path) < 0) { 715 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 716 exit(1); 717 } 718 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 719 setfib(fib) < 0) { 720 jail_warnx(j, "setfib: %s", strerror(errno)); 721 exit(1); 722 } 723 724 /* 725 * We wouldn't have specialized our affinity, so just setid to 726 * root. We do this prior to attaching to avoid the kernel 727 * having to create a transient cpuset that we'll promptly 728 * free up with a reset to the jail's cpuset. 729 * 730 * This is just a best-effort to use as wide of mask as 731 * possible. 732 */ 733 if (setid != CPUSET_INVALID) 734 (void)cpuset_setid(CPU_WHICH_PID, -1, setid); 735 736 if (jail_attach(j->jid) < 0) { 737 jail_warnx(j, "jail_attach: %s", strerror(errno)); 738 exit(1); 739 } 740 } 741 if (clean || username) { 742 if (!(injail && sjuser) && 743 get_user_info(j, username, &pwd, &lcap) < 0) 744 exit(1); 745 if (clean) { 746 term = getenv("TERM"); 747 environ = &cleanenv; 748 setenv("PATH", "/bin:/usr/bin", 0); 749 if (term != NULL) 750 setenv("TERM", term, 1); 751 } 752 if (setgid(pwd->pw_gid) < 0) { 753 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 754 strerror(errno)); 755 exit(1); 756 } 757 if (setusercontext(lcap, pwd, pwd->pw_uid, username 758 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 759 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 760 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 761 strerror(errno)); 762 exit(1); 763 } 764 login_close(lcap); 765 setenv("USER", pwd->pw_name, 1); 766 setenv("HOME", pwd->pw_dir, 1); 767 setenv("SHELL", 768 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 769 if (clean && chdir(pwd->pw_dir) < 0) { 770 jail_warnx(j, "chdir %s: %s", 771 pwd->pw_dir, strerror(errno)); 772 exit(1); 773 } 774 endpwent(); 775 } 776 777 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 778 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 779 exit(1); 780 } 781 closefrom(3); 782 execvp(argv[0], __DECONST(char *const*, argv)); 783 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 784 exit(1); 785} 786 787/* 788 * Add a process to the hash, tied to a jail. 789 */ 790static int 791add_proc(struct cfjail *j, pid_t pid) 792{ 793 struct kevent ke; 794 struct cfjail *tj; 795 struct phash *ph; 796 797 if (!kq && (kq = kqueue()) < 0) 798 err(1, "kqueue"); 799 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 800 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 801 if (errno == ESRCH) 802 return 0; 803 err(1, "kevent"); 804 } 805 ph = emalloc(sizeof(struct phash)); 806 ph->j = j; 807 ph->pid = pid; 808 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 809 j->nprocs++; 810 j->flags |= JF_SLEEPQ; 811 if (j->timeout.tv_sec == 0) 812 requeue(j, &sleeping); 813 else { 814 /* File the jail in the sleep queue according to its timeout. */ 815 TAILQ_REMOVE(j->queue, j, tq); 816 TAILQ_FOREACH(tj, &sleeping, tq) { 817 if (!tj->timeout.tv_sec || 818 j->timeout.tv_sec < tj->timeout.tv_sec || 819 (j->timeout.tv_sec == tj->timeout.tv_sec && 820 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 821 TAILQ_INSERT_BEFORE(tj, j, tq); 822 break; 823 } 824 } 825 if (tj == NULL) 826 TAILQ_INSERT_TAIL(&sleeping, j, tq); 827 j->queue = &sleeping; 828 } 829 return 1; 830} 831 832/* 833 * Remove any processes from the hash that correspond to a jail. 834 */ 835static void 836clear_procs(struct cfjail *j) 837{ 838 struct kevent ke; 839 struct phash *ph, *tph; 840 int i; 841 842 j->nprocs = 0; 843 for (i = 0; i < PHASH_SIZE; i++) 844 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 845 if (ph->j == j) { 846 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 847 NOTE_EXIT, 0, NULL); 848 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 849 LIST_REMOVE(ph, le); 850 free(ph); 851 } 852} 853 854/* 855 * Find the jail that corresponds to an exited process. 856 */ 857static struct cfjail * 858find_proc(pid_t pid) 859{ 860 struct cfjail *j; 861 struct phash *ph; 862 863 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 864 if (ph->pid == pid) { 865 j = ph->j; 866 LIST_REMOVE(ph, le); 867 free(ph); 868 return --j->nprocs ? NULL : j; 869 } 870 return NULL; 871} 872 873/* 874 * Send SIGTERM to all processes in a jail and wait for them to die. 875 */ 876static int 877term_procs(struct cfjail *j) 878{ 879 struct kinfo_proc *ki; 880 int i, noted, pcnt, timeout; 881 882 static kvm_t *kd; 883 884 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 885 timeout = DEFAULT_STOP_TIMEOUT; 886 else if (timeout == 0) 887 return 0; 888 889 if (kd == NULL) { 890 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 891 if (kd == NULL) 892 return 0; 893 } 894 895 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 896 if (ki == NULL) 897 return 0; 898 noted = 0; 899 for (i = 0; i < pcnt; i++) 900 if (ki[i].ki_jid == j->jid && 901 kill(ki[i].ki_pid, SIGTERM) == 0) { 902 (void)add_proc(j, ki[i].ki_pid); 903 if (verbose > 0) { 904 if (!noted) { 905 noted = 1; 906 jail_note(j, "sent SIGTERM to:"); 907 } 908 printf(" %d", ki[i].ki_pid); 909 } 910 } 911 if (noted) 912 printf("\n"); 913 if (j->nprocs > 0) { 914 clock_gettime(CLOCK_REALTIME, &j->timeout); 915 j->timeout.tv_sec += timeout; 916 return 1; 917 } 918 return 0; 919} 920 921/* 922 * Look up a user in the passwd and login.conf files. 923 */ 924static int 925get_user_info(struct cfjail *j, const char *username, 926 const struct passwd **pwdp, login_cap_t **lcapp) 927{ 928 const struct passwd *pwd; 929 930 errno = 0; 931 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 932 if (pwd == NULL) { 933 if (errno) 934 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 935 username ? username : "", strerror(errno)); 936 else if (username) 937 jail_warnx(j, "%s: no such user", username); 938 else 939 jail_warnx(j, "unknown uid %d", getuid()); 940 return -1; 941 } 942 *lcapp = login_getpwclass(pwd); 943 if (*lcapp == NULL) { 944 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 945 strerror(errno)); 946 return -1; 947 } 948 /* Set the groups while the group file is still available */ 949 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 950 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 951 strerror(errno)); 952 return -1; 953 } 954 return 0; 955} 956 957/* 958 * Make sure a mount or consolelog path is a valid absolute pathname 959 * with no symlinks. 960 */ 961static int 962check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 963 const char *umount_type) 964{ 965 struct stat st, mpst; 966 struct statfs stfs; 967 char *tpath, *p; 968 const char *jailpath; 969 size_t jplen; 970 971 if (path[0] != '/') { 972 jail_warnx(j, "%s: %s: not an absolute pathname", 973 pname, path); 974 return -1; 975 } 976 /* 977 * Only check for symlinks in components below the jail's path, 978 * since that's where the security risk lies. 979 */ 980 jailpath = string_param(j->intparams[KP_PATH]); 981 if (jailpath == NULL) 982 jailpath = ""; 983 jplen = strlen(jailpath); 984 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 985 tpath = alloca(strlen(path) + 1); 986 strcpy(tpath, path); 987 for (p = tpath + jplen; p != NULL; ) { 988 p = strchr(p + 1, '/'); 989 if (p) 990 *p = '\0'; 991 if (lstat(tpath, &st) < 0) { 992 if (errno == ENOENT && isfile && !p) 993 break; 994 jail_warnx(j, "%s: %s: %s", pname, tpath, 995 strerror(errno)); 996 return -1; 997 } 998 if (S_ISLNK(st.st_mode)) { 999 jail_warnx(j, "%s: %s is a symbolic link", 1000 pname, tpath); 1001 return -1; 1002 } 1003 if (p) 1004 *p = '/'; 1005 } 1006 } 1007 if (umount_type != NULL) { 1008 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 1009 jail_warnx(j, "%s: %s: %s", pname, path, 1010 strerror(errno)); 1011 return -1; 1012 } 1013 if (stat(stfs.f_mntonname, &mpst) < 0) { 1014 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 1015 strerror(errno)); 1016 return -1; 1017 } 1018 if (st.st_ino != mpst.st_ino) { 1019 jail_warnx(j, "%s: %s: not a mount point", 1020 pname, path); 1021 return -1; 1022 } 1023 if (strcmp(stfs.f_fstypename, umount_type)) { 1024 jail_warnx(j, "%s: %s: not a %s mount", 1025 pname, path, umount_type); 1026 return -1; 1027 } 1028 } 1029 return 0; 1030} 1031