command.c revision 298729
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: stable/10/usr.sbin/jail/command.c 298729 2016-04-28 01:40:47Z jamie $"); 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#include <vis.h> 51 52#include "jailp.h" 53 54#define DEFAULT_STOP_TIMEOUT 10 55#define PHASH_SIZE 256 56 57LIST_HEAD(phhead, phash); 58 59struct phash { 60 LIST_ENTRY(phash) le; 61 struct cfjail *j; 62 pid_t pid; 63}; 64 65int paralimit = -1; 66 67extern char **environ; 68 69static int run_command(struct cfjail *j); 70static int add_proc(struct cfjail *j, pid_t pid); 71static void clear_procs(struct cfjail *j); 72static struct cfjail *find_proc(pid_t pid); 73static int term_procs(struct cfjail *j); 74static int get_user_info(struct cfjail *j, const char *username, 75 const struct passwd **pwdp, login_cap_t **lcapp); 76static int check_path(struct cfjail *j, const char *pname, const char *path, 77 int isfile, const char *umount_type); 78 79static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 80static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 81static struct cfstring dummystring = { .len = 1 }; 82static struct phhead phash[PHASH_SIZE]; 83static int kq; 84 85/* 86 * Run the next command associated with a jail. 87 */ 88int 89next_command(struct cfjail *j) 90{ 91 enum intparam comparam; 92 int create_failed, stopping; 93 94 if (paralimit == 0) { 95 requeue(j, &runnable); 96 return 1; 97 } 98 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 99 stopping = (j->flags & JF_STOP) != 0; 100 comparam = *j->comparam; 101 for (;;) { 102 if (j->comstring == NULL) { 103 j->comparam += create_failed ? -1 : 1; 104 switch ((comparam = *j->comparam)) { 105 case IP__NULL: 106 return 0; 107 case IP_MOUNT_DEVFS: 108 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 109 continue; 110 j->comstring = &dummystring; 111 break; 112 case IP_MOUNT_FDESCFS: 113 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 114 continue; 115 j->comstring = &dummystring; 116 break; 117 case IP_MOUNT_PROCFS: 118 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 119 continue; 120 j->comstring = &dummystring; 121 break; 122 case IP__OP: 123 case IP_STOP_TIMEOUT: 124 j->comstring = &dummystring; 125 break; 126 default: 127 if (j->intparams[comparam] == NULL) 128 continue; 129 j->comstring = create_failed || (stopping && 130 (j->intparams[comparam]->flags & PF_REV)) 131 ? TAILQ_LAST(&j->intparams[comparam]->val, 132 cfstrings) 133 : TAILQ_FIRST(&j->intparams[comparam]->val); 134 } 135 } else { 136 j->comstring = j->comstring == &dummystring ? NULL : 137 create_failed || (stopping && 138 (j->intparams[comparam]->flags & PF_REV)) 139 ? TAILQ_PREV(j->comstring, cfstrings, tq) 140 : TAILQ_NEXT(j->comstring, tq); 141 } 142 if (j->comstring == NULL || j->comstring->len == 0 || 143 (create_failed && (comparam == IP_EXEC_PRESTART || 144 comparam == IP_EXEC_START || comparam == IP_COMMAND || 145 comparam == IP_EXEC_POSTSTART))) 146 continue; 147 switch (run_command(j)) { 148 case -1: 149 failed(j); 150 /* FALLTHROUGH */ 151 case 1: 152 return 1; 153 } 154 } 155} 156 157/* 158 * Check command exit status 159 */ 160int 161finish_command(struct cfjail *j) 162{ 163 int error; 164 165 if (!(j->flags & JF_SLEEPQ)) 166 return 0; 167 j->flags &= ~JF_SLEEPQ; 168 if (*j->comparam == IP_STOP_TIMEOUT) 169 { 170 j->flags &= ~JF_TIMEOUT; 171 j->pstatus = 0; 172 return 0; 173 } 174 paralimit++; 175 if (!TAILQ_EMPTY(&runnable)) 176 requeue(TAILQ_FIRST(&runnable), &ready); 177 error = 0; 178 if (j->flags & JF_TIMEOUT) { 179 j->flags &= ~JF_TIMEOUT; 180 if (*j->comparam != IP_STOP_TIMEOUT) { 181 jail_warnx(j, "%s: timed out", j->comline); 182 failed(j); 183 error = -1; 184 } else if (verbose > 0) 185 jail_note(j, "timed out\n"); 186 } else if (j->pstatus != 0) { 187 if (WIFSIGNALED(j->pstatus)) 188 jail_warnx(j, "%s: exited on signal %d", 189 j->comline, WTERMSIG(j->pstatus)); 190 else 191 jail_warnx(j, "%s: failed", j->comline); 192 j->pstatus = 0; 193 failed(j); 194 error = -1; 195 } 196 free(j->comline); 197 j->comline = NULL; 198 return error; 199} 200 201/* 202 * Check for finished processes or timeouts. 203 */ 204struct cfjail * 205next_proc(int nonblock) 206{ 207 struct kevent ke; 208 struct timespec ts; 209 struct timespec *tsp; 210 struct cfjail *j; 211 212 if (!TAILQ_EMPTY(&sleeping)) { 213 again: 214 tsp = NULL; 215 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 216 clock_gettime(CLOCK_REALTIME, &ts); 217 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 218 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 219 if (ts.tv_nsec < 0) { 220 ts.tv_sec--; 221 ts.tv_nsec += 1000000000; 222 } 223 if (ts.tv_sec < 0 || 224 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 225 j->flags |= JF_TIMEOUT; 226 clear_procs(j); 227 return j; 228 } 229 tsp = &ts; 230 } 231 if (nonblock) { 232 ts.tv_sec = 0; 233 ts.tv_nsec = 0; 234 tsp = &ts; 235 } 236 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 237 case -1: 238 if (errno != EINTR) 239 err(1, "kevent"); 240 goto again; 241 case 0: 242 if (!nonblock) { 243 j = TAILQ_FIRST(&sleeping); 244 j->flags |= JF_TIMEOUT; 245 clear_procs(j); 246 return j; 247 } 248 break; 249 case 1: 250 (void)waitpid(ke.ident, NULL, WNOHANG); 251 if ((j = find_proc(ke.ident))) { 252 j->pstatus = ke.data; 253 return j; 254 } 255 goto again; 256 } 257 } 258 return NULL; 259} 260 261/* 262 * Run a single command for a jail, possible inside the jail. 263 */ 264static int 265run_command(struct cfjail *j) 266{ 267 const struct passwd *pwd; 268 const struct cfstring *comstring, *s; 269 login_cap_t *lcap; 270 char **argv; 271 char *cs, *comcs, *devpath; 272 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 273 enum intparam comparam; 274 size_t comlen; 275 pid_t pid; 276 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 277#if defined(INET) || defined(INET6) 278 char *addr, *extrap, *p, *val; 279#endif 280 281 static char *cleanenv; 282 283 /* Perform some operations that aren't actually commands */ 284 comparam = *j->comparam; 285 down = j->flags & (JF_STOP | JF_FAILED); 286 switch (comparam) { 287 case IP_STOP_TIMEOUT: 288 return term_procs(j); 289 290 case IP__OP: 291 if (down) { 292 if (jail_remove(j->jid) < 0 && errno == EPERM) { 293 jail_warnx(j, "jail_remove: %s", 294 strerror(errno)); 295 return -1; 296 } 297 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 298 ? note_remove : j->name != NULL))) 299 jail_note(j, "removed\n"); 300 j->jid = -1; 301 if (j->flags & JF_STOP) 302 dep_done(j, DF_LIGHT); 303 else 304 j->flags &= ~JF_PERSIST; 305 } else { 306 if (create_jail(j) < 0) 307 return -1; 308 if (iflag) 309 printf("%d\n", j->jid); 310 if (verbose >= 0 && (j->name || verbose > 0)) 311 jail_note(j, "created\n"); 312 dep_done(j, DF_LIGHT); 313 } 314 return 0; 315 316 default: ; 317 } 318 /* 319 * Collect exec arguments. Internal commands for network and 320 * mounting build their own argument lists. 321 */ 322 comstring = j->comstring; 323 bg = 0; 324 switch (comparam) { 325#ifdef INET 326 case IP__IP4_IFADDR: 327 argc = 0; 328 val = alloca(strlen(comstring->s) + 1); 329 strcpy(val, comstring->s); 330 cs = val; 331 extrap = NULL; 332 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 333 if (extrap == NULL) { 334 *p = '\0'; 335 extrap = p + 1; 336 } 337 cs = p + 1; 338 argc++; 339 } 340 341 argv = alloca((8 + argc) * sizeof(char *)); 342 *(const char **)&argv[0] = _PATH_IFCONFIG; 343 if ((cs = strchr(val, '|'))) { 344 argv[1] = alloca(cs - val + 1); 345 strlcpy(argv[1], val, cs - val + 1); 346 addr = cs + 1; 347 } else { 348 *(const char **)&argv[1] = 349 string_param(j->intparams[IP_INTERFACE]); 350 addr = val; 351 } 352 *(const char **)&argv[2] = "inet"; 353 if (!(cs = strchr(addr, '/'))) { 354 argv[3] = addr; 355 *(const char **)&argv[4] = "netmask"; 356 *(const char **)&argv[5] = "255.255.255.255"; 357 argc = 6; 358 } else if (strchr(cs + 1, '.')) { 359 argv[3] = alloca(cs - addr + 1); 360 strlcpy(argv[3], addr, cs - addr + 1); 361 *(const char **)&argv[4] = "netmask"; 362 *(const char **)&argv[5] = cs + 1; 363 argc = 6; 364 } else { 365 argv[3] = addr; 366 argc = 4; 367 } 368 369 if (!down) { 370 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 371 size_t len = strlen(cs) + 1; 372 argv[argc] = alloca(len); 373 strlcpy(argv[argc++], cs, len); 374 } 375 } 376 377 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 378 argv[argc + 1] = NULL; 379 break; 380#endif 381 382#ifdef INET6 383 case IP__IP6_IFADDR: 384 argc = 0; 385 val = alloca(strlen(comstring->s) + 1); 386 strcpy(val, comstring->s); 387 cs = val; 388 extrap = NULL; 389 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 390 if (extrap == NULL) { 391 *p = '\0'; 392 extrap = p + 1; 393 } 394 cs = p + 1; 395 argc++; 396 } 397 398 argv = alloca((8 + argc) * sizeof(char *)); 399 *(const char **)&argv[0] = _PATH_IFCONFIG; 400 if ((cs = strchr(val, '|'))) { 401 argv[1] = alloca(cs - val + 1); 402 strlcpy(argv[1], val, cs - val + 1); 403 addr = cs + 1; 404 } else { 405 *(const char **)&argv[1] = 406 string_param(j->intparams[IP_INTERFACE]); 407 addr = val; 408 } 409 *(const char **)&argv[2] = "inet6"; 410 argv[3] = addr; 411 if (!(cs = strchr(addr, '/'))) { 412 *(const char **)&argv[4] = "prefixlen"; 413 *(const char **)&argv[5] = "128"; 414 argc = 6; 415 } else 416 argc = 4; 417 418 if (!down) { 419 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 420 size_t len = strlen(cs) + 1; 421 argv[argc] = alloca(len); 422 strlcpy(argv[argc++], cs, len); 423 } 424 } 425 426 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 427 argv[argc + 1] = NULL; 428 break; 429#endif 430 431 case IP_VNET_INTERFACE: 432 argv = alloca(5 * sizeof(char *)); 433 *(const char **)&argv[0] = _PATH_IFCONFIG; 434 argv[1] = comstring->s; 435 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 436 jidstr = string_param(j->intparams[KP_JID]); 437 *(const char **)&argv[3] = 438 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 439 argv[4] = NULL; 440 break; 441 442 case IP_MOUNT: 443 case IP__MOUNT_FROM_FSTAB: 444 argv = alloca(8 * sizeof(char *)); 445 comcs = alloca(comstring->len + 1); 446 strcpy(comcs, comstring->s); 447 argc = 0; 448 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 449 cs = strtok(NULL, " \t\f\v\r\n")) { 450 if (argc <= 1 && strunvis(cs, cs) < 0) { 451 jail_warnx(j, "%s: %s: fstab parse error", 452 j->intparams[comparam]->name, comstring->s); 453 return -1; 454 } 455 argv[argc++] = cs; 456 } 457 if (argc == 0) 458 return 0; 459 if (argc < 3) { 460 jail_warnx(j, "%s: %s: missing information", 461 j->intparams[comparam]->name, comstring->s); 462 return -1; 463 } 464 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 465 down ? argv[2] : NULL) < 0) 466 return -1; 467 if (down) { 468 argv[4] = NULL; 469 argv[3] = argv[1]; 470 *(const char **)&argv[0] = "/sbin/umount"; 471 } else { 472 if (argc == 4) { 473 argv[7] = NULL; 474 argv[6] = argv[1]; 475 argv[5] = argv[0]; 476 argv[4] = argv[3]; 477 *(const char **)&argv[3] = "-o"; 478 } else { 479 argv[5] = NULL; 480 argv[4] = argv[1]; 481 argv[3] = argv[0]; 482 } 483 *(const char **)&argv[0] = _PATH_MOUNT; 484 } 485 *(const char **)&argv[1] = "-t"; 486 break; 487 488 case IP_MOUNT_DEVFS: 489 argv = alloca(7 * sizeof(char *)); 490 path = string_param(j->intparams[KP_PATH]); 491 if (path == NULL) { 492 jail_warnx(j, "mount.devfs: no path"); 493 return -1; 494 } 495 devpath = alloca(strlen(path) + 5); 496 sprintf(devpath, "%s/dev", path); 497 if (check_path(j, "mount.devfs", devpath, 0, 498 down ? "devfs" : NULL) < 0) 499 return -1; 500 if (down) { 501 *(const char **)&argv[0] = "/sbin/umount"; 502 argv[1] = devpath; 503 argv[2] = NULL; 504 } else { 505 *(const char **)&argv[0] = _PATH_MOUNT; 506 *(const char **)&argv[1] = "-t"; 507 *(const char **)&argv[2] = "devfs"; 508 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 509 if (!ruleset) 510 ruleset = "4"; /* devfsrules_jail */ 511 argv[3] = alloca(11 + strlen(ruleset)); 512 sprintf(argv[3], "-oruleset=%s", ruleset); 513 *(const char **)&argv[4] = "."; 514 argv[5] = devpath; 515 argv[6] = NULL; 516 } 517 break; 518 519 case IP_MOUNT_FDESCFS: 520 argv = alloca(7 * sizeof(char *)); 521 path = string_param(j->intparams[KP_PATH]); 522 if (path == NULL) { 523 jail_warnx(j, "mount.fdescfs: no path"); 524 return -1; 525 } 526 devpath = alloca(strlen(path) + 8); 527 sprintf(devpath, "%s/dev/fd", path); 528 if (check_path(j, "mount.fdescfs", devpath, 0, 529 down ? "fdescfs" : NULL) < 0) 530 return -1; 531 if (down) { 532 *(const char **)&argv[0] = "/sbin/umount"; 533 argv[1] = devpath; 534 argv[2] = NULL; 535 } else { 536 *(const char **)&argv[0] = _PATH_MOUNT; 537 *(const char **)&argv[1] = "-t"; 538 *(const char **)&argv[2] = "fdescfs"; 539 *(const char **)&argv[3] = "."; 540 argv[4] = devpath; 541 argv[5] = NULL; 542 } 543 break; 544 545 case IP_MOUNT_PROCFS: 546 argv = alloca(7 * sizeof(char *)); 547 path = string_param(j->intparams[KP_PATH]); 548 if (path == NULL) { 549 jail_warnx(j, "mount.procfs: no path"); 550 return -1; 551 } 552 devpath = alloca(strlen(path) + 6); 553 sprintf(devpath, "%s/proc", path); 554 if (check_path(j, "mount.procfs", devpath, 0, 555 down ? "procfs" : NULL) < 0) 556 return -1; 557 if (down) { 558 *(const char **)&argv[0] = "/sbin/umount"; 559 argv[1] = devpath; 560 argv[2] = NULL; 561 } else { 562 *(const char **)&argv[0] = _PATH_MOUNT; 563 *(const char **)&argv[1] = "-t"; 564 *(const char **)&argv[2] = "procfs"; 565 *(const char **)&argv[3] = "."; 566 argv[4] = devpath; 567 argv[5] = NULL; 568 } 569 break; 570 571 case IP_COMMAND: 572 if (j->name != NULL) 573 goto default_command; 574 argc = 0; 575 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 576 argc++; 577 argv = alloca((argc + 1) * sizeof(char *)); 578 argc = 0; 579 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 580 argv[argc++] = s->s; 581 argv[argc] = NULL; 582 j->comstring = &dummystring; 583 break; 584 585 default: 586 default_command: 587 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 588 !(cs[0] == '&' && cs[1] == '\0')) { 589 argv = alloca(4 * sizeof(char *)); 590 *(const char **)&argv[0] = _PATH_BSHELL; 591 *(const char **)&argv[1] = "-c"; 592 argv[2] = comstring->s; 593 argv[3] = NULL; 594 } else { 595 if (cs) { 596 *cs = 0; 597 bg = 1; 598 } 599 comcs = alloca(comstring->len + 1); 600 strcpy(comcs, comstring->s); 601 argc = 0; 602 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 603 cs = strtok(NULL, " \t\f\v\r\n")) 604 argc++; 605 argv = alloca((argc + 1) * sizeof(char *)); 606 strcpy(comcs, comstring->s); 607 argc = 0; 608 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 609 cs = strtok(NULL, " \t\f\v\r\n")) 610 argv[argc++] = cs; 611 argv[argc] = NULL; 612 } 613 } 614 if (argv[0] == NULL) 615 return 0; 616 617 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 618 timeout != 0) { 619 clock_gettime(CLOCK_REALTIME, &j->timeout); 620 j->timeout.tv_sec += timeout; 621 } else 622 j->timeout.tv_sec = 0; 623 624 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 625 comparam == IP_EXEC_STOP; 626 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 627 username = string_param(j->intparams[injail 628 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 629 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 630 631 consfd = 0; 632 if (injail && 633 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 634 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 635 return -1; 636 consfd = 637 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 638 if (consfd < 0) { 639 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 640 return -1; 641 } 642 } 643 644 comlen = 0; 645 for (i = 0; argv[i]; i++) 646 comlen += strlen(argv[i]) + 1; 647 j->comline = cs = emalloc(comlen); 648 for (i = 0; argv[i]; i++) { 649 strcpy(cs, argv[i]); 650 if (argv[i + 1]) { 651 cs += strlen(argv[i]) + 1; 652 cs[-1] = ' '; 653 } 654 } 655 if (verbose > 0) 656 jail_note(j, "run command%s%s%s: %s\n", 657 injail ? " in jail" : "", username ? " as " : "", 658 username ? username : "", j->comline); 659 660 pid = fork(); 661 if (pid < 0) 662 err(1, "fork"); 663 if (pid > 0) { 664 if (bg || !add_proc(j, pid)) { 665 free(j->comline); 666 j->comline = NULL; 667 return 0; 668 } else { 669 paralimit--; 670 return 1; 671 } 672 } 673 if (bg) 674 setsid(); 675 676 /* Set up the environment and run the command */ 677 pwd = NULL; 678 lcap = NULL; 679 if ((clean || username) && injail && sjuser && 680 get_user_info(j, username, &pwd, &lcap) < 0) 681 exit(1); 682 if (injail) { 683 /* jail_attach won't chdir along with its chroot. */ 684 path = string_param(j->intparams[KP_PATH]); 685 if (path && chdir(path) < 0) { 686 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 687 exit(1); 688 } 689 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 690 setfib(fib) < 0) { 691 jail_warnx(j, "setfib: %s", strerror(errno)); 692 exit(1); 693 } 694 if (jail_attach(j->jid) < 0) { 695 jail_warnx(j, "jail_attach: %s", strerror(errno)); 696 exit(1); 697 } 698 } 699 if (clean || username) { 700 if (!(injail && sjuser) && 701 get_user_info(j, username, &pwd, &lcap) < 0) 702 exit(1); 703 if (clean) { 704 term = getenv("TERM"); 705 environ = &cleanenv; 706 setenv("PATH", "/bin:/usr/bin", 0); 707 if (term != NULL) 708 setenv("TERM", term, 1); 709 } 710 if (setgid(pwd->pw_gid) < 0) { 711 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 712 strerror(errno)); 713 exit(1); 714 } 715 if (setusercontext(lcap, pwd, pwd->pw_uid, username 716 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 717 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 718 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 719 strerror(errno)); 720 exit(1); 721 } 722 login_close(lcap); 723 setenv("USER", pwd->pw_name, 1); 724 setenv("HOME", pwd->pw_dir, 1); 725 setenv("SHELL", 726 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 727 if (clean && chdir(pwd->pw_dir) < 0) { 728 jail_warnx(j, "chdir %s: %s", 729 pwd->pw_dir, strerror(errno)); 730 exit(1); 731 } 732 endpwent(); 733 } 734 735 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 736 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 737 exit(1); 738 } 739 closefrom(3); 740 execvp(argv[0], argv); 741 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 742 exit(1); 743} 744 745/* 746 * Add a process to the hash, tied to a jail. 747 */ 748static int 749add_proc(struct cfjail *j, pid_t pid) 750{ 751 struct kevent ke; 752 struct cfjail *tj; 753 struct phash *ph; 754 755 if (!kq && (kq = kqueue()) < 0) 756 err(1, "kqueue"); 757 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 758 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 759 if (errno == ESRCH) 760 return 0; 761 err(1, "kevent"); 762 } 763 ph = emalloc(sizeof(struct phash)); 764 ph->j = j; 765 ph->pid = pid; 766 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 767 j->nprocs++; 768 j->flags |= JF_SLEEPQ; 769 if (j->timeout.tv_sec == 0) 770 requeue(j, &sleeping); 771 else { 772 /* File the jail in the sleep queue according to its timeout. */ 773 TAILQ_REMOVE(j->queue, j, tq); 774 TAILQ_FOREACH(tj, &sleeping, tq) { 775 if (!tj->timeout.tv_sec || 776 j->timeout.tv_sec < tj->timeout.tv_sec || 777 (j->timeout.tv_sec == tj->timeout.tv_sec && 778 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 779 TAILQ_INSERT_BEFORE(tj, j, tq); 780 break; 781 } 782 } 783 if (tj == NULL) 784 TAILQ_INSERT_TAIL(&sleeping, j, tq); 785 j->queue = &sleeping; 786 } 787 return 1; 788} 789 790/* 791 * Remove any processes from the hash that correspond to a jail. 792 */ 793static void 794clear_procs(struct cfjail *j) 795{ 796 struct kevent ke; 797 struct phash *ph, *tph; 798 int i; 799 800 j->nprocs = 0; 801 for (i = 0; i < PHASH_SIZE; i++) 802 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 803 if (ph->j == j) { 804 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 805 NOTE_EXIT, 0, NULL); 806 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 807 LIST_REMOVE(ph, le); 808 free(ph); 809 } 810} 811 812/* 813 * Find the jail that corresponds to an exited process. 814 */ 815static struct cfjail * 816find_proc(pid_t pid) 817{ 818 struct cfjail *j; 819 struct phash *ph; 820 821 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 822 if (ph->pid == pid) { 823 j = ph->j; 824 LIST_REMOVE(ph, le); 825 free(ph); 826 return --j->nprocs ? NULL : j; 827 } 828 return NULL; 829} 830 831/* 832 * Send SIGTERM to all processes in a jail and wait for them to die. 833 */ 834static int 835term_procs(struct cfjail *j) 836{ 837 struct kinfo_proc *ki; 838 int i, noted, pcnt, timeout; 839 840 static kvm_t *kd; 841 842 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 843 timeout = DEFAULT_STOP_TIMEOUT; 844 else if (timeout == 0) 845 return 0; 846 847 if (kd == NULL) { 848 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 849 if (kd == NULL) 850 return 0; 851 } 852 853 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 854 if (ki == NULL) 855 return 0; 856 noted = 0; 857 for (i = 0; i < pcnt; i++) 858 if (ki[i].ki_jid == j->jid && 859 kill(ki[i].ki_pid, SIGTERM) == 0) { 860 (void)add_proc(j, ki[i].ki_pid); 861 if (verbose > 0) { 862 if (!noted) { 863 noted = 1; 864 jail_note(j, "sent SIGTERM to:"); 865 } 866 printf(" %d", ki[i].ki_pid); 867 } 868 } 869 if (noted) 870 printf("\n"); 871 if (j->nprocs > 0) { 872 clock_gettime(CLOCK_REALTIME, &j->timeout); 873 j->timeout.tv_sec += timeout; 874 return 1; 875 } 876 return 0; 877} 878 879/* 880 * Look up a user in the passwd and login.conf files. 881 */ 882static int 883get_user_info(struct cfjail *j, const char *username, 884 const struct passwd **pwdp, login_cap_t **lcapp) 885{ 886 const struct passwd *pwd; 887 888 errno = 0; 889 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 890 if (pwd == NULL) { 891 if (errno) 892 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 893 username ? username : "", strerror(errno)); 894 else if (username) 895 jail_warnx(j, "%s: no such user", username); 896 else 897 jail_warnx(j, "unknown uid %d", getuid()); 898 return -1; 899 } 900 *lcapp = login_getpwclass(pwd); 901 if (*lcapp == NULL) { 902 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 903 strerror(errno)); 904 return -1; 905 } 906 /* Set the groups while the group file is still available */ 907 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 908 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 909 strerror(errno)); 910 return -1; 911 } 912 return 0; 913} 914 915/* 916 * Make sure a mount or consolelog path is a valid absolute pathname 917 * with no symlinks. 918 */ 919static int 920check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 921 const char *umount_type) 922{ 923 struct stat st, mpst; 924 struct statfs stfs; 925 char *tpath, *p; 926 const char *jailpath; 927 size_t jplen; 928 929 if (path[0] != '/') { 930 jail_warnx(j, "%s: %s: not an absolute pathname", 931 pname, path); 932 return -1; 933 } 934 /* 935 * Only check for symlinks in components below the jail's path, 936 * since that's where the security risk lies. 937 */ 938 jailpath = string_param(j->intparams[KP_PATH]); 939 if (jailpath == NULL) 940 jailpath = ""; 941 jplen = strlen(jailpath); 942 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 943 tpath = alloca(strlen(path) + 1); 944 strcpy(tpath, path); 945 for (p = tpath + jplen; p != NULL; ) { 946 p = strchr(p + 1, '/'); 947 if (p) 948 *p = '\0'; 949 if (lstat(tpath, &st) < 0) { 950 if (errno == ENOENT && isfile && !p) 951 break; 952 jail_warnx(j, "%s: %s: %s", pname, tpath, 953 strerror(errno)); 954 return -1; 955 } 956 if (S_ISLNK(st.st_mode)) { 957 jail_warnx(j, "%s: %s is a symbolic link", 958 pname, tpath); 959 return -1; 960 } 961 if (p) 962 *p = '/'; 963 } 964 } 965 if (umount_type != NULL) { 966 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 967 jail_warnx(j, "%s: %s: %s", pname, path, 968 strerror(errno)); 969 return -1; 970 } 971 if (stat(stfs.f_mntonname, &mpst) < 0) { 972 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 973 strerror(errno)); 974 return -1; 975 } 976 if (st.st_ino != mpst.st_ino) { 977 jail_warnx(j, "%s: %s: not a mount point", 978 pname, path); 979 return -1; 980 } 981 if (strcmp(stfs.f_fstypename, umount_type)) { 982 jail_warnx(j, "%s: %s: not a %s mount", 983 pname, path, umount_type); 984 return -1; 985 } 986 } 987 return 0; 988} 989