command.c revision 278484
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 278484 2015-02-10 01:05:51Z 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 51#include "jailp.h" 52 53#define DEFAULT_STOP_TIMEOUT 10 54#define PHASH_SIZE 256 55 56LIST_HEAD(phhead, phash); 57 58struct phash { 59 LIST_ENTRY(phash) le; 60 struct cfjail *j; 61 pid_t pid; 62}; 63 64int paralimit = -1; 65 66extern char **environ; 67 68static int run_command(struct cfjail *j); 69static int add_proc(struct cfjail *j, pid_t pid); 70static void clear_procs(struct cfjail *j); 71static struct cfjail *find_proc(pid_t pid); 72static int term_procs(struct cfjail *j); 73static int get_user_info(struct cfjail *j, const char *username, 74 const struct passwd **pwdp, login_cap_t **lcapp); 75static int check_path(struct cfjail *j, const char *pname, const char *path, 76 int isfile, const char *umount_type); 77 78static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 79static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 80static struct cfstring dummystring = { .len = 1 }; 81static struct phhead phash[PHASH_SIZE]; 82static int kq; 83 84/* 85 * Run the next command associated with a jail. 86 */ 87int 88next_command(struct cfjail *j) 89{ 90 enum intparam comparam; 91 int create_failed, stopping; 92 93 if (paralimit == 0) { 94 requeue(j, &runnable); 95 return 1; 96 } 97 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 98 stopping = (j->flags & JF_STOP) != 0; 99 comparam = *j->comparam; 100 for (;;) { 101 if (j->comstring == NULL) { 102 j->comparam += create_failed ? -1 : 1; 103 switch ((comparam = *j->comparam)) { 104 case IP__NULL: 105 return 0; 106 case IP_MOUNT_DEVFS: 107 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 108 continue; 109 j->comstring = &dummystring; 110 break; 111 case IP_MOUNT_FDESCFS: 112 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 113 continue; 114 j->comstring = &dummystring; 115 break; 116 case IP_MOUNT_PROCFS: 117 if (!bool_param(j->intparams[IP_MOUNT_PROCFS])) 118 continue; 119 j->comstring = &dummystring; 120 break; 121 case IP__OP: 122 case IP_STOP_TIMEOUT: 123 j->comstring = &dummystring; 124 break; 125 default: 126 if (j->intparams[comparam] == NULL) 127 continue; 128 j->comstring = create_failed || (stopping && 129 (j->intparams[comparam]->flags & PF_REV)) 130 ? TAILQ_LAST(&j->intparams[comparam]->val, 131 cfstrings) 132 : TAILQ_FIRST(&j->intparams[comparam]->val); 133 } 134 } else { 135 j->comstring = j->comstring == &dummystring ? NULL : 136 create_failed || (stopping && 137 (j->intparams[comparam]->flags & PF_REV)) 138 ? TAILQ_PREV(j->comstring, cfstrings, tq) 139 : TAILQ_NEXT(j->comstring, tq); 140 } 141 if (j->comstring == NULL || j->comstring->len == 0 || 142 (create_failed && (comparam == IP_EXEC_PRESTART || 143 comparam == IP_EXEC_START || comparam == IP_COMMAND || 144 comparam == IP_EXEC_POSTSTART))) 145 continue; 146 switch (run_command(j)) { 147 case -1: 148 failed(j); 149 /* FALLTHROUGH */ 150 case 1: 151 return 1; 152 } 153 } 154} 155 156/* 157 * Check command exit status 158 */ 159int 160finish_command(struct cfjail *j) 161{ 162 int error; 163 164 if (!(j->flags & JF_SLEEPQ)) 165 return 0; 166 j->flags &= ~JF_SLEEPQ; 167 if (*j->comparam == IP_STOP_TIMEOUT) 168 { 169 j->flags &= ~JF_TIMEOUT; 170 j->pstatus = 0; 171 return 0; 172 } 173 paralimit++; 174 if (!TAILQ_EMPTY(&runnable)) 175 requeue(TAILQ_FIRST(&runnable), &ready); 176 error = 0; 177 if (j->flags & JF_TIMEOUT) { 178 j->flags &= ~JF_TIMEOUT; 179 if (*j->comparam != IP_STOP_TIMEOUT) { 180 jail_warnx(j, "%s: timed out", j->comline); 181 failed(j); 182 error = -1; 183 } else if (verbose > 0) 184 jail_note(j, "timed out\n"); 185 } else if (j->pstatus != 0) { 186 if (WIFSIGNALED(j->pstatus)) 187 jail_warnx(j, "%s: exited on signal %d", 188 j->comline, WTERMSIG(j->pstatus)); 189 else 190 jail_warnx(j, "%s: failed", j->comline); 191 j->pstatus = 0; 192 failed(j); 193 error = -1; 194 } 195 free(j->comline); 196 j->comline = NULL; 197 return error; 198} 199 200/* 201 * Check for finished processes or timeouts. 202 */ 203struct cfjail * 204next_proc(int nonblock) 205{ 206 struct kevent ke; 207 struct timespec ts; 208 struct timespec *tsp; 209 struct cfjail *j; 210 211 if (!TAILQ_EMPTY(&sleeping)) { 212 again: 213 tsp = NULL; 214 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 215 clock_gettime(CLOCK_REALTIME, &ts); 216 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 217 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 218 if (ts.tv_nsec < 0) { 219 ts.tv_sec--; 220 ts.tv_nsec += 1000000000; 221 } 222 if (ts.tv_sec < 0 || 223 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 224 j->flags |= JF_TIMEOUT; 225 clear_procs(j); 226 return j; 227 } 228 tsp = &ts; 229 } 230 if (nonblock) { 231 ts.tv_sec = 0; 232 ts.tv_nsec = 0; 233 tsp = &ts; 234 } 235 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 236 case -1: 237 if (errno != EINTR) 238 err(1, "kevent"); 239 goto again; 240 case 0: 241 if (!nonblock) { 242 j = TAILQ_FIRST(&sleeping); 243 j->flags |= JF_TIMEOUT; 244 clear_procs(j); 245 return j; 246 } 247 break; 248 case 1: 249 (void)waitpid(ke.ident, NULL, WNOHANG); 250 if ((j = find_proc(ke.ident))) { 251 j->pstatus = ke.data; 252 return j; 253 } 254 goto again; 255 } 256 } 257 return NULL; 258} 259 260/* 261 * Run a single command for a jail, possible inside the jail. 262 */ 263static int 264run_command(struct cfjail *j) 265{ 266 const struct passwd *pwd; 267 const struct cfstring *comstring, *s; 268 login_cap_t *lcap; 269 char **argv; 270 char *cs, *comcs, *devpath; 271 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 272 enum intparam comparam; 273 size_t comlen; 274 pid_t pid; 275 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 276#if defined(INET) || defined(INET6) 277 char *addr, *extrap, *p, *val; 278#endif 279 280 static char *cleanenv; 281 282 /* Perform some operations that aren't actually commands */ 283 comparam = *j->comparam; 284 down = j->flags & (JF_STOP | JF_FAILED); 285 switch (comparam) { 286 case IP_STOP_TIMEOUT: 287 return term_procs(j); 288 289 case IP__OP: 290 if (down) { 291 if (jail_remove(j->jid) < 0 && errno == EPERM) { 292 jail_warnx(j, "jail_remove: %s", 293 strerror(errno)); 294 return -1; 295 } 296 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 297 ? note_remove : j->name != NULL))) 298 jail_note(j, "removed\n"); 299 j->jid = -1; 300 if (j->flags & JF_STOP) 301 dep_done(j, DF_LIGHT); 302 else 303 j->flags &= ~JF_PERSIST; 304 } else { 305 if (create_jail(j) < 0) 306 return -1; 307 if (iflag) 308 printf("%d\n", j->jid); 309 if (verbose >= 0 && (j->name || verbose > 0)) 310 jail_note(j, "created\n"); 311 dep_done(j, DF_LIGHT); 312 } 313 return 0; 314 315 default: ; 316 } 317 /* 318 * Collect exec arguments. Internal commands for network and 319 * mounting build their own argument lists. 320 */ 321 comstring = j->comstring; 322 bg = 0; 323 switch (comparam) { 324#ifdef INET 325 case IP__IP4_IFADDR: 326 argc = 0; 327 val = alloca(strlen(comstring->s) + 1); 328 strcpy(val, comstring->s); 329 cs = val; 330 extrap = NULL; 331 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 332 if (extrap == NULL) { 333 *p = '\0'; 334 extrap = p + 1; 335 } 336 cs = p + 1; 337 argc++; 338 } 339 340 argv = alloca((8 + argc) * sizeof(char *)); 341 *(const char **)&argv[0] = _PATH_IFCONFIG; 342 if ((cs = strchr(val, '|'))) { 343 argv[1] = alloca(cs - val + 1); 344 strlcpy(argv[1], val, cs - val + 1); 345 addr = cs + 1; 346 } else { 347 *(const char **)&argv[1] = 348 string_param(j->intparams[IP_INTERFACE]); 349 addr = val; 350 } 351 *(const char **)&argv[2] = "inet"; 352 if (!(cs = strchr(addr, '/'))) { 353 argv[3] = addr; 354 *(const char **)&argv[4] = "netmask"; 355 *(const char **)&argv[5] = "255.255.255.255"; 356 argc = 6; 357 } else if (strchr(cs + 1, '.')) { 358 argv[3] = alloca(cs - addr + 1); 359 strlcpy(argv[3], addr, cs - addr + 1); 360 *(const char **)&argv[4] = "netmask"; 361 *(const char **)&argv[5] = cs + 1; 362 argc = 6; 363 } else { 364 argv[3] = addr; 365 argc = 4; 366 } 367 368 if (!down) { 369 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 370 size_t len = strlen(cs) + 1; 371 argv[argc] = alloca(len); 372 strlcpy(argv[argc++], cs, len); 373 } 374 } 375 376 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 377 argv[argc + 1] = NULL; 378 break; 379#endif 380 381#ifdef INET6 382 case IP__IP6_IFADDR: 383 argc = 0; 384 val = alloca(strlen(comstring->s) + 1); 385 strcpy(val, comstring->s); 386 cs = val; 387 extrap = NULL; 388 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 389 if (extrap == NULL) { 390 *p = '\0'; 391 extrap = p + 1; 392 } 393 cs = p + 1; 394 argc++; 395 } 396 397 argv = alloca((8 + argc) * sizeof(char *)); 398 *(const char **)&argv[0] = _PATH_IFCONFIG; 399 if ((cs = strchr(val, '|'))) { 400 argv[1] = alloca(cs - val + 1); 401 strlcpy(argv[1], val, cs - val + 1); 402 addr = cs + 1; 403 } else { 404 *(const char **)&argv[1] = 405 string_param(j->intparams[IP_INTERFACE]); 406 addr = val; 407 } 408 *(const char **)&argv[2] = "inet6"; 409 argv[3] = addr; 410 if (!(cs = strchr(addr, '/'))) { 411 *(const char **)&argv[4] = "prefixlen"; 412 *(const char **)&argv[5] = "128"; 413 argc = 6; 414 } else 415 argc = 4; 416 417 if (!down) { 418 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 419 size_t len = strlen(cs) + 1; 420 argv[argc] = alloca(len); 421 strlcpy(argv[argc++], cs, len); 422 } 423 } 424 425 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 426 argv[argc + 1] = NULL; 427 break; 428#endif 429 430 case IP_VNET_INTERFACE: 431 argv = alloca(5 * sizeof(char *)); 432 *(const char **)&argv[0] = _PATH_IFCONFIG; 433 argv[1] = comstring->s; 434 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 435 jidstr = string_param(j->intparams[KP_JID]); 436 *(const char **)&argv[3] = 437 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 438 argv[4] = NULL; 439 break; 440 441 case IP_MOUNT: 442 case IP__MOUNT_FROM_FSTAB: 443 argv = alloca(8 * sizeof(char *)); 444 comcs = alloca(comstring->len + 1); 445 strcpy(comcs, comstring->s); 446 argc = 0; 447 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 448 cs = strtok(NULL, " \t\f\v\r\n")) 449 argv[argc++] = cs; 450 if (argc == 0) 451 return 0; 452 if (argc < 3) { 453 jail_warnx(j, "%s: %s: missing information", 454 j->intparams[comparam]->name, comstring->s); 455 return -1; 456 } 457 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 458 down ? argv[2] : NULL) < 0) 459 return -1; 460 if (down) { 461 argv[4] = NULL; 462 argv[3] = argv[1]; 463 *(const char **)&argv[0] = "/sbin/umount"; 464 } else { 465 if (argc == 4) { 466 argv[7] = NULL; 467 argv[6] = argv[1]; 468 argv[5] = argv[0]; 469 argv[4] = argv[3]; 470 *(const char **)&argv[3] = "-o"; 471 } else { 472 argv[5] = NULL; 473 argv[4] = argv[1]; 474 argv[3] = argv[0]; 475 } 476 *(const char **)&argv[0] = _PATH_MOUNT; 477 } 478 *(const char **)&argv[1] = "-t"; 479 break; 480 481 case IP_MOUNT_DEVFS: 482 argv = alloca(7 * sizeof(char *)); 483 path = string_param(j->intparams[KP_PATH]); 484 if (path == NULL) { 485 jail_warnx(j, "mount.devfs: no path"); 486 return -1; 487 } 488 devpath = alloca(strlen(path) + 5); 489 sprintf(devpath, "%s/dev", path); 490 if (check_path(j, "mount.devfs", devpath, 0, 491 down ? "devfs" : NULL) < 0) 492 return -1; 493 if (down) { 494 *(const char **)&argv[0] = "/sbin/umount"; 495 argv[1] = devpath; 496 argv[2] = NULL; 497 } else { 498 *(const char **)&argv[0] = _PATH_MOUNT; 499 *(const char **)&argv[1] = "-t"; 500 *(const char **)&argv[2] = "devfs"; 501 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 502 if (!ruleset) 503 ruleset = "4"; /* devfsrules_jail */ 504 argv[3] = alloca(11 + strlen(ruleset)); 505 sprintf(argv[3], "-oruleset=%s", ruleset); 506 *(const char **)&argv[4] = "."; 507 argv[5] = devpath; 508 argv[6] = NULL; 509 } 510 break; 511 512 case IP_MOUNT_FDESCFS: 513 argv = alloca(7 * sizeof(char *)); 514 path = string_param(j->intparams[KP_PATH]); 515 if (path == NULL) { 516 jail_warnx(j, "mount.fdescfs: no path"); 517 return -1; 518 } 519 devpath = alloca(strlen(path) + 8); 520 sprintf(devpath, "%s/dev/fd", path); 521 if (check_path(j, "mount.fdescfs", devpath, 0, 522 down ? "fdescfs" : NULL) < 0) 523 return -1; 524 if (down) { 525 *(const char **)&argv[0] = "/sbin/umount"; 526 argv[1] = devpath; 527 argv[2] = NULL; 528 } else { 529 *(const char **)&argv[0] = _PATH_MOUNT; 530 *(const char **)&argv[1] = "-t"; 531 *(const char **)&argv[2] = "fdescfs"; 532 *(const char **)&argv[3] = "."; 533 argv[4] = devpath; 534 argv[5] = NULL; 535 } 536 break; 537 538 case IP_MOUNT_PROCFS: 539 argv = alloca(7 * sizeof(char *)); 540 path = string_param(j->intparams[KP_PATH]); 541 if (path == NULL) { 542 jail_warnx(j, "mount.procfs: no path"); 543 return -1; 544 } 545 devpath = alloca(strlen(path) + 6); 546 sprintf(devpath, "%s/proc", path); 547 if (check_path(j, "mount.procfs", devpath, 0, 548 down ? "procfs" : NULL) < 0) 549 return -1; 550 if (down) { 551 *(const char **)&argv[0] = "/sbin/umount"; 552 argv[1] = devpath; 553 argv[2] = NULL; 554 } else { 555 *(const char **)&argv[0] = _PATH_MOUNT; 556 *(const char **)&argv[1] = "-t"; 557 *(const char **)&argv[2] = "procfs"; 558 *(const char **)&argv[3] = "."; 559 argv[4] = devpath; 560 argv[5] = NULL; 561 } 562 break; 563 564 case IP_COMMAND: 565 if (j->name != NULL) 566 goto default_command; 567 argc = 0; 568 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 569 argc++; 570 argv = alloca((argc + 1) * sizeof(char *)); 571 argc = 0; 572 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 573 argv[argc++] = s->s; 574 argv[argc] = NULL; 575 j->comstring = &dummystring; 576 break; 577 578 default: 579 default_command: 580 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 581 !(cs[0] == '&' && cs[1] == '\0')) { 582 argv = alloca(4 * sizeof(char *)); 583 *(const char **)&argv[0] = _PATH_BSHELL; 584 *(const char **)&argv[1] = "-c"; 585 argv[2] = comstring->s; 586 argv[3] = NULL; 587 } else { 588 if (cs) { 589 *cs = 0; 590 bg = 1; 591 } 592 comcs = alloca(comstring->len + 1); 593 strcpy(comcs, comstring->s); 594 argc = 0; 595 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 596 cs = strtok(NULL, " \t\f\v\r\n")) 597 argc++; 598 argv = alloca((argc + 1) * sizeof(char *)); 599 strcpy(comcs, comstring->s); 600 argc = 0; 601 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 602 cs = strtok(NULL, " \t\f\v\r\n")) 603 argv[argc++] = cs; 604 argv[argc] = NULL; 605 } 606 } 607 if (argv[0] == NULL) 608 return 0; 609 610 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 611 timeout != 0) { 612 clock_gettime(CLOCK_REALTIME, &j->timeout); 613 j->timeout.tv_sec += timeout; 614 } else 615 j->timeout.tv_sec = 0; 616 617 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 618 comparam == IP_EXEC_STOP; 619 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 620 username = string_param(j->intparams[injail 621 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 622 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 623 624 consfd = 0; 625 if (injail && 626 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 627 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 628 return -1; 629 consfd = 630 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 631 if (consfd < 0) { 632 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 633 return -1; 634 } 635 } 636 637 comlen = 0; 638 for (i = 0; argv[i]; i++) 639 comlen += strlen(argv[i]) + 1; 640 j->comline = cs = emalloc(comlen); 641 for (i = 0; argv[i]; i++) { 642 strcpy(cs, argv[i]); 643 if (argv[i + 1]) { 644 cs += strlen(argv[i]) + 1; 645 cs[-1] = ' '; 646 } 647 } 648 if (verbose > 0) 649 jail_note(j, "run command%s%s%s: %s\n", 650 injail ? " in jail" : "", username ? " as " : "", 651 username ? username : "", j->comline); 652 653 pid = fork(); 654 if (pid < 0) 655 err(1, "fork"); 656 if (pid > 0) { 657 if (bg || !add_proc(j, pid)) { 658 free(j->comline); 659 j->comline = NULL; 660 return 0; 661 } else { 662 paralimit--; 663 return 1; 664 } 665 } 666 if (bg) 667 setsid(); 668 669 /* Set up the environment and run the command */ 670 pwd = NULL; 671 lcap = NULL; 672 if ((clean || username) && injail && sjuser && 673 get_user_info(j, username, &pwd, &lcap) < 0) 674 exit(1); 675 if (injail) { 676 /* jail_attach won't chdir along with its chroot. */ 677 path = string_param(j->intparams[KP_PATH]); 678 if (path && chdir(path) < 0) { 679 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 680 exit(1); 681 } 682 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 683 setfib(fib) < 0) { 684 jail_warnx(j, "setfib: %s", strerror(errno)); 685 exit(1); 686 } 687 if (jail_attach(j->jid) < 0) { 688 jail_warnx(j, "jail_attach: %s", strerror(errno)); 689 exit(1); 690 } 691 } 692 if (clean || username) { 693 if (!(injail && sjuser) && 694 get_user_info(j, username, &pwd, &lcap) < 0) 695 exit(1); 696 if (clean) { 697 term = getenv("TERM"); 698 environ = &cleanenv; 699 setenv("PATH", "/bin:/usr/bin", 0); 700 if (term != NULL) 701 setenv("TERM", term, 1); 702 } 703 if (setgid(pwd->pw_gid) < 0) { 704 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 705 strerror(errno)); 706 exit(1); 707 } 708 if (setusercontext(lcap, pwd, pwd->pw_uid, username 709 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 710 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 711 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 712 strerror(errno)); 713 exit(1); 714 } 715 login_close(lcap); 716 setenv("USER", pwd->pw_name, 1); 717 setenv("HOME", pwd->pw_dir, 1); 718 setenv("SHELL", 719 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 720 if (clean && chdir(pwd->pw_dir) < 0) { 721 jail_warnx(j, "chdir %s: %s", 722 pwd->pw_dir, strerror(errno)); 723 exit(1); 724 } 725 endpwent(); 726 } 727 728 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 729 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 730 exit(1); 731 } 732 closefrom(3); 733 execvp(argv[0], argv); 734 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 735 exit(1); 736} 737 738/* 739 * Add a process to the hash, tied to a jail. 740 */ 741static int 742add_proc(struct cfjail *j, pid_t pid) 743{ 744 struct kevent ke; 745 struct cfjail *tj; 746 struct phash *ph; 747 748 if (!kq && (kq = kqueue()) < 0) 749 err(1, "kqueue"); 750 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 751 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 752 if (errno == ESRCH) 753 return 0; 754 err(1, "kevent"); 755 } 756 ph = emalloc(sizeof(struct phash)); 757 ph->j = j; 758 ph->pid = pid; 759 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 760 j->nprocs++; 761 j->flags |= JF_SLEEPQ; 762 if (j->timeout.tv_sec == 0) 763 requeue(j, &sleeping); 764 else { 765 /* File the jail in the sleep queue acording to its timeout. */ 766 TAILQ_REMOVE(j->queue, j, tq); 767 TAILQ_FOREACH(tj, &sleeping, tq) { 768 if (!tj->timeout.tv_sec || 769 j->timeout.tv_sec < tj->timeout.tv_sec || 770 (j->timeout.tv_sec == tj->timeout.tv_sec && 771 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 772 TAILQ_INSERT_BEFORE(tj, j, tq); 773 break; 774 } 775 } 776 if (tj == NULL) 777 TAILQ_INSERT_TAIL(&sleeping, j, tq); 778 j->queue = &sleeping; 779 } 780 return 1; 781} 782 783/* 784 * Remove any processes from the hash that correspond to a jail. 785 */ 786static void 787clear_procs(struct cfjail *j) 788{ 789 struct kevent ke; 790 struct phash *ph, *tph; 791 int i; 792 793 j->nprocs = 0; 794 for (i = 0; i < PHASH_SIZE; i++) 795 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 796 if (ph->j == j) { 797 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 798 NOTE_EXIT, 0, NULL); 799 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 800 LIST_REMOVE(ph, le); 801 free(ph); 802 } 803} 804 805/* 806 * Find the jail that corresponds to an exited process. 807 */ 808static struct cfjail * 809find_proc(pid_t pid) 810{ 811 struct cfjail *j; 812 struct phash *ph; 813 814 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 815 if (ph->pid == pid) { 816 j = ph->j; 817 LIST_REMOVE(ph, le); 818 free(ph); 819 return --j->nprocs ? NULL : j; 820 } 821 return NULL; 822} 823 824/* 825 * Send SIGTERM to all processes in a jail and wait for them to die. 826 */ 827static int 828term_procs(struct cfjail *j) 829{ 830 struct kinfo_proc *ki; 831 int i, noted, pcnt, timeout; 832 833 static kvm_t *kd; 834 835 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 836 timeout = DEFAULT_STOP_TIMEOUT; 837 else if (timeout == 0) 838 return 0; 839 840 if (kd == NULL) { 841 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 842 if (kd == NULL) 843 return 0; 844 } 845 846 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 847 if (ki == NULL) 848 return 0; 849 noted = 0; 850 for (i = 0; i < pcnt; i++) 851 if (ki[i].ki_jid == j->jid && 852 kill(ki[i].ki_pid, SIGTERM) == 0) { 853 (void)add_proc(j, ki[i].ki_pid); 854 if (verbose > 0) { 855 if (!noted) { 856 noted = 1; 857 jail_note(j, "sent SIGTERM to:"); 858 } 859 printf(" %d", ki[i].ki_pid); 860 } 861 } 862 if (noted) 863 printf("\n"); 864 if (j->nprocs > 0) { 865 clock_gettime(CLOCK_REALTIME, &j->timeout); 866 j->timeout.tv_sec += timeout; 867 return 1; 868 } 869 return 0; 870} 871 872/* 873 * Look up a user in the passwd and login.conf files. 874 */ 875static int 876get_user_info(struct cfjail *j, const char *username, 877 const struct passwd **pwdp, login_cap_t **lcapp) 878{ 879 const struct passwd *pwd; 880 881 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 882 if (pwd == NULL) { 883 if (errno) 884 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 885 username ? username : "", strerror(errno)); 886 else if (username) 887 jail_warnx(j, "%s: no such user", username); 888 else 889 jail_warnx(j, "unknown uid %d", getuid()); 890 return -1; 891 } 892 *lcapp = login_getpwclass(pwd); 893 if (*lcapp == NULL) { 894 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 895 strerror(errno)); 896 return -1; 897 } 898 /* Set the groups while the group file is still available */ 899 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 900 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 901 strerror(errno)); 902 return -1; 903 } 904 return 0; 905} 906 907/* 908 * Make sure a mount or consolelog path is a valid absolute pathname 909 * with no symlinks. 910 */ 911static int 912check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 913 const char *umount_type) 914{ 915 struct stat st, mpst; 916 struct statfs stfs; 917 char *tpath, *p; 918 const char *jailpath; 919 size_t jplen; 920 921 if (path[0] != '/') { 922 jail_warnx(j, "%s: %s: not an absolute pathname", 923 pname, path); 924 return -1; 925 } 926 /* 927 * Only check for symlinks in components below the jail's path, 928 * since that's where the security risk lies. 929 */ 930 jailpath = string_param(j->intparams[KP_PATH]); 931 if (jailpath == NULL) 932 jailpath = ""; 933 jplen = strlen(jailpath); 934 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 935 tpath = alloca(strlen(path) + 1); 936 strcpy(tpath, path); 937 for (p = tpath + jplen; p != NULL; ) { 938 p = strchr(p + 1, '/'); 939 if (p) 940 *p = '\0'; 941 if (lstat(tpath, &st) < 0) { 942 if (errno == ENOENT && isfile && !p) 943 break; 944 jail_warnx(j, "%s: %s: %s", pname, tpath, 945 strerror(errno)); 946 return -1; 947 } 948 if (S_ISLNK(st.st_mode)) { 949 jail_warnx(j, "%s: %s is a symbolic link", 950 pname, tpath); 951 return -1; 952 } 953 if (p) 954 *p = '/'; 955 } 956 } 957 if (umount_type != NULL) { 958 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 959 jail_warnx(j, "%s: %s: %s", pname, path, 960 strerror(errno)); 961 return -1; 962 } 963 if (stat(stfs.f_mntonname, &mpst) < 0) { 964 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 965 strerror(errno)); 966 return -1; 967 } 968 if (st.st_ino != mpst.st_ino) { 969 jail_warnx(j, "%s: %s: not a mount point", 970 pname, path); 971 return -1; 972 } 973 if (strcmp(stfs.f_fstypename, umount_type)) { 974 jail_warnx(j, "%s: %s: not a %s mount", 975 pname, path, umount_type); 976 return -1; 977 } 978 } 979 return 0; 980} 981