command.c revision 276277
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 276277 2014-12-27 02:17:35Z 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 case IP__OP: 116 case IP_STOP_TIMEOUT: 117 j->comstring = &dummystring; 118 break; 119 default: 120 if (j->intparams[comparam] == NULL) 121 continue; 122 j->comstring = create_failed || (stopping && 123 (j->intparams[comparam]->flags & PF_REV)) 124 ? TAILQ_LAST(&j->intparams[comparam]->val, 125 cfstrings) 126 : TAILQ_FIRST(&j->intparams[comparam]->val); 127 } 128 } else { 129 j->comstring = j->comstring == &dummystring ? NULL : 130 create_failed || (stopping && 131 (j->intparams[comparam]->flags & PF_REV)) 132 ? TAILQ_PREV(j->comstring, cfstrings, tq) 133 : TAILQ_NEXT(j->comstring, tq); 134 } 135 if (j->comstring == NULL || j->comstring->len == 0 || 136 (create_failed && (comparam == IP_EXEC_PRESTART || 137 comparam == IP_EXEC_START || comparam == IP_COMMAND || 138 comparam == IP_EXEC_POSTSTART))) 139 continue; 140 switch (run_command(j)) { 141 case -1: 142 failed(j); 143 /* FALLTHROUGH */ 144 case 1: 145 return 1; 146 } 147 } 148} 149 150/* 151 * Check command exit status 152 */ 153int 154finish_command(struct cfjail *j) 155{ 156 int error; 157 158 if (!(j->flags & JF_SLEEPQ)) 159 return 0; 160 j->flags &= ~JF_SLEEPQ; 161 if (*j->comparam == IP_STOP_TIMEOUT) 162 { 163 j->flags &= ~JF_TIMEOUT; 164 j->pstatus = 0; 165 return 0; 166 } 167 paralimit++; 168 if (!TAILQ_EMPTY(&runnable)) 169 requeue(TAILQ_FIRST(&runnable), &ready); 170 error = 0; 171 if (j->flags & JF_TIMEOUT) { 172 j->flags &= ~JF_TIMEOUT; 173 if (*j->comparam != IP_STOP_TIMEOUT) { 174 jail_warnx(j, "%s: timed out", j->comline); 175 failed(j); 176 error = -1; 177 } else if (verbose > 0) 178 jail_note(j, "timed out\n"); 179 } else if (j->pstatus != 0) { 180 if (WIFSIGNALED(j->pstatus)) 181 jail_warnx(j, "%s: exited on signal %d", 182 j->comline, WTERMSIG(j->pstatus)); 183 else 184 jail_warnx(j, "%s: failed", j->comline); 185 j->pstatus = 0; 186 failed(j); 187 error = -1; 188 } 189 free(j->comline); 190 j->comline = NULL; 191 return error; 192} 193 194/* 195 * Check for finished processes or timeouts. 196 */ 197struct cfjail * 198next_proc(int nonblock) 199{ 200 struct kevent ke; 201 struct timespec ts; 202 struct timespec *tsp; 203 struct cfjail *j; 204 205 if (!TAILQ_EMPTY(&sleeping)) { 206 again: 207 tsp = NULL; 208 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 209 clock_gettime(CLOCK_REALTIME, &ts); 210 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 211 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 212 if (ts.tv_nsec < 0) { 213 ts.tv_sec--; 214 ts.tv_nsec += 1000000000; 215 } 216 if (ts.tv_sec < 0 || 217 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 218 j->flags |= JF_TIMEOUT; 219 clear_procs(j); 220 return j; 221 } 222 tsp = &ts; 223 } 224 if (nonblock) { 225 ts.tv_sec = 0; 226 ts.tv_nsec = 0; 227 tsp = &ts; 228 } 229 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 230 case -1: 231 if (errno != EINTR) 232 err(1, "kevent"); 233 goto again; 234 case 0: 235 if (!nonblock) { 236 j = TAILQ_FIRST(&sleeping); 237 j->flags |= JF_TIMEOUT; 238 clear_procs(j); 239 return j; 240 } 241 break; 242 case 1: 243 (void)waitpid(ke.ident, NULL, WNOHANG); 244 if ((j = find_proc(ke.ident))) { 245 j->pstatus = ke.data; 246 return j; 247 } 248 goto again; 249 } 250 } 251 return NULL; 252} 253 254/* 255 * Run a single command for a jail, possible inside the jail. 256 */ 257static int 258run_command(struct cfjail *j) 259{ 260 const struct passwd *pwd; 261 const struct cfstring *comstring, *s; 262 login_cap_t *lcap; 263 char **argv; 264 char *cs, *comcs, *devpath; 265 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 266 enum intparam comparam; 267 size_t comlen; 268 pid_t pid; 269 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 270#if defined(INET) || defined(INET6) 271 char *addr, *extrap, *p, *val; 272#endif 273 274 static char *cleanenv; 275 276 /* Perform some operations that aren't actually commands */ 277 comparam = *j->comparam; 278 down = j->flags & (JF_STOP | JF_FAILED); 279 switch (comparam) { 280 case IP_STOP_TIMEOUT: 281 return term_procs(j); 282 283 case IP__OP: 284 if (down) { 285 if (jail_remove(j->jid) < 0 && errno == EPERM) { 286 jail_warnx(j, "jail_remove: %s", 287 strerror(errno)); 288 return -1; 289 } 290 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 291 ? note_remove : j->name != NULL))) 292 jail_note(j, "removed\n"); 293 j->jid = -1; 294 if (j->flags & JF_STOP) 295 dep_done(j, DF_LIGHT); 296 else 297 j->flags &= ~JF_PERSIST; 298 } else { 299 if (create_jail(j) < 0) 300 return -1; 301 if (iflag) 302 printf("%d\n", j->jid); 303 if (verbose >= 0 && (j->name || verbose > 0)) 304 jail_note(j, "created\n"); 305 dep_done(j, DF_LIGHT); 306 } 307 return 0; 308 309 default: ; 310 } 311 /* 312 * Collect exec arguments. Internal commands for network and 313 * mounting build their own argument lists. 314 */ 315 comstring = j->comstring; 316 bg = 0; 317 switch (comparam) { 318#ifdef INET 319 case IP__IP4_IFADDR: 320 argc = 0; 321 val = alloca(strlen(comstring->s) + 1); 322 strcpy(val, comstring->s); 323 cs = val; 324 extrap = NULL; 325 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 326 if (extrap == NULL) { 327 *p = '\0'; 328 extrap = p + 1; 329 } 330 cs = p + 1; 331 argc++; 332 } 333 334 argv = alloca((8 + argc) * sizeof(char *)); 335 *(const char **)&argv[0] = _PATH_IFCONFIG; 336 if ((cs = strchr(val, '|'))) { 337 argv[1] = alloca(cs - val + 1); 338 strlcpy(argv[1], val, cs - val + 1); 339 addr = cs + 1; 340 } else { 341 *(const char **)&argv[1] = 342 string_param(j->intparams[IP_INTERFACE]); 343 addr = val; 344 } 345 *(const char **)&argv[2] = "inet"; 346 if (!(cs = strchr(addr, '/'))) { 347 argv[3] = addr; 348 *(const char **)&argv[4] = "netmask"; 349 *(const char **)&argv[5] = "255.255.255.255"; 350 argc = 6; 351 } else if (strchr(cs + 1, '.')) { 352 argv[3] = alloca(cs - addr + 1); 353 strlcpy(argv[3], addr, cs - addr + 1); 354 *(const char **)&argv[4] = "netmask"; 355 *(const char **)&argv[5] = cs + 1; 356 argc = 6; 357 } else { 358 argv[3] = addr; 359 argc = 4; 360 } 361 362 if (!down) { 363 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 364 size_t len = strlen(cs) + 1; 365 argv[argc] = alloca(len); 366 strlcpy(argv[argc++], cs, len); 367 } 368 } 369 370 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 371 argv[argc + 1] = NULL; 372 break; 373#endif 374 375#ifdef INET6 376 case IP__IP6_IFADDR: 377 argc = 0; 378 val = alloca(strlen(comstring->s) + 1); 379 strcpy(val, comstring->s); 380 cs = val; 381 extrap = NULL; 382 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) { 383 if (extrap == NULL) { 384 *p = '\0'; 385 extrap = p + 1; 386 } 387 cs = p + 1; 388 argc++; 389 } 390 391 argv = alloca((8 + argc) * sizeof(char *)); 392 *(const char **)&argv[0] = _PATH_IFCONFIG; 393 if ((cs = strchr(val, '|'))) { 394 argv[1] = alloca(cs - val + 1); 395 strlcpy(argv[1], val, cs - val + 1); 396 addr = cs + 1; 397 } else { 398 *(const char **)&argv[1] = 399 string_param(j->intparams[IP_INTERFACE]); 400 addr = val; 401 } 402 *(const char **)&argv[2] = "inet6"; 403 argv[3] = addr; 404 if (!(cs = strchr(addr, '/'))) { 405 *(const char **)&argv[4] = "prefixlen"; 406 *(const char **)&argv[5] = "128"; 407 argc = 6; 408 } else 409 argc = 4; 410 411 if (!down) { 412 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) { 413 size_t len = strlen(cs) + 1; 414 argv[argc] = alloca(len); 415 strlcpy(argv[argc++], cs, len); 416 } 417 } 418 419 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 420 argv[argc + 1] = NULL; 421 break; 422#endif 423 424 case IP_VNET_INTERFACE: 425 argv = alloca(5 * sizeof(char *)); 426 *(const char **)&argv[0] = _PATH_IFCONFIG; 427 argv[1] = comstring->s; 428 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 429 jidstr = string_param(j->intparams[KP_JID]); 430 *(const char **)&argv[3] = 431 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 432 argv[4] = NULL; 433 break; 434 435 case IP_MOUNT: 436 case IP__MOUNT_FROM_FSTAB: 437 argv = alloca(8 * sizeof(char *)); 438 comcs = alloca(comstring->len + 1); 439 strcpy(comcs, comstring->s); 440 argc = 0; 441 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 442 cs = strtok(NULL, " \t\f\v\r\n")) 443 argv[argc++] = cs; 444 if (argc == 0) 445 return 0; 446 if (argc < 3) { 447 jail_warnx(j, "%s: %s: missing information", 448 j->intparams[comparam]->name, comstring->s); 449 return -1; 450 } 451 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 452 down ? argv[2] : NULL) < 0) 453 return -1; 454 if (down) { 455 argv[4] = NULL; 456 argv[3] = argv[1]; 457 *(const char **)&argv[0] = "/sbin/umount"; 458 } else { 459 if (argc == 4) { 460 argv[7] = NULL; 461 argv[6] = argv[1]; 462 argv[5] = argv[0]; 463 argv[4] = argv[3]; 464 *(const char **)&argv[3] = "-o"; 465 } else { 466 argv[5] = NULL; 467 argv[4] = argv[1]; 468 argv[3] = argv[0]; 469 } 470 *(const char **)&argv[0] = _PATH_MOUNT; 471 } 472 *(const char **)&argv[1] = "-t"; 473 break; 474 475 case IP_MOUNT_DEVFS: 476 argv = alloca(7 * sizeof(char *)); 477 path = string_param(j->intparams[KP_PATH]); 478 if (path == NULL) { 479 jail_warnx(j, "mount.devfs: no path"); 480 return -1; 481 } 482 devpath = alloca(strlen(path) + 5); 483 sprintf(devpath, "%s/dev", path); 484 if (check_path(j, "mount.devfs", devpath, 0, 485 down ? "devfs" : NULL) < 0) 486 return -1; 487 if (down) { 488 *(const char **)&argv[0] = "/sbin/umount"; 489 argv[1] = devpath; 490 argv[2] = NULL; 491 } else { 492 *(const char **)&argv[0] = _PATH_MOUNT; 493 *(const char **)&argv[1] = "-t"; 494 *(const char **)&argv[2] = "devfs"; 495 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 496 if (!ruleset) 497 ruleset = "4"; /* devfsrules_jail */ 498 argv[3] = alloca(11 + strlen(ruleset)); 499 sprintf(argv[3], "-oruleset=%s", ruleset); 500 *(const char **)&argv[4] = "."; 501 argv[5] = devpath; 502 argv[6] = NULL; 503 } 504 break; 505 506 case IP_MOUNT_FDESCFS: 507 argv = alloca(7 * sizeof(char *)); 508 path = string_param(j->intparams[KP_PATH]); 509 if (path == NULL) { 510 jail_warnx(j, "mount.fdescfs: no path"); 511 return -1; 512 } 513 devpath = alloca(strlen(path) + 8); 514 sprintf(devpath, "%s/dev/fd", path); 515 if (check_path(j, "mount.fdescfs", devpath, 0, 516 down ? "fdescfs" : NULL) < 0) 517 return -1; 518 if (down) { 519 *(const char **)&argv[0] = "/sbin/umount"; 520 argv[1] = devpath; 521 argv[2] = NULL; 522 } else { 523 *(const char **)&argv[0] = _PATH_MOUNT; 524 *(const char **)&argv[1] = "-t"; 525 *(const char **)&argv[2] = "fdescfs"; 526 *(const char **)&argv[3] = "."; 527 argv[4] = devpath; 528 argv[5] = NULL; 529 } 530 break; 531 532 case IP_COMMAND: 533 if (j->name != NULL) 534 goto default_command; 535 argc = 0; 536 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 537 argc++; 538 argv = alloca((argc + 1) * sizeof(char *)); 539 argc = 0; 540 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 541 argv[argc++] = s->s; 542 argv[argc] = NULL; 543 j->comstring = &dummystring; 544 break; 545 546 default: 547 default_command: 548 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 549 !(cs[0] == '&' && cs[1] == '\0')) { 550 argv = alloca(4 * sizeof(char *)); 551 *(const char **)&argv[0] = _PATH_BSHELL; 552 *(const char **)&argv[1] = "-c"; 553 argv[2] = comstring->s; 554 argv[3] = NULL; 555 } else { 556 if (cs) { 557 *cs = 0; 558 bg = 1; 559 } 560 comcs = alloca(comstring->len + 1); 561 strcpy(comcs, comstring->s); 562 argc = 0; 563 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 564 cs = strtok(NULL, " \t\f\v\r\n")) 565 argc++; 566 argv = alloca((argc + 1) * sizeof(char *)); 567 strcpy(comcs, comstring->s); 568 argc = 0; 569 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 570 cs = strtok(NULL, " \t\f\v\r\n")) 571 argv[argc++] = cs; 572 argv[argc] = NULL; 573 } 574 } 575 if (argv[0] == NULL) 576 return 0; 577 578 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 579 timeout != 0) { 580 clock_gettime(CLOCK_REALTIME, &j->timeout); 581 j->timeout.tv_sec += timeout; 582 } else 583 j->timeout.tv_sec = 0; 584 585 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 586 comparam == IP_EXEC_STOP; 587 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 588 username = string_param(j->intparams[injail 589 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 590 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 591 592 consfd = 0; 593 if (injail && 594 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 595 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 596 return -1; 597 consfd = 598 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 599 if (consfd < 0) { 600 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 601 return -1; 602 } 603 } 604 605 comlen = 0; 606 for (i = 0; argv[i]; i++) 607 comlen += strlen(argv[i]) + 1; 608 j->comline = cs = emalloc(comlen); 609 for (i = 0; argv[i]; i++) { 610 strcpy(cs, argv[i]); 611 if (argv[i + 1]) { 612 cs += strlen(argv[i]) + 1; 613 cs[-1] = ' '; 614 } 615 } 616 if (verbose > 0) 617 jail_note(j, "run command%s%s%s: %s\n", 618 injail ? " in jail" : "", username ? " as " : "", 619 username ? username : "", j->comline); 620 621 pid = fork(); 622 if (pid < 0) 623 err(1, "fork"); 624 if (pid > 0) { 625 if (bg || !add_proc(j, pid)) { 626 free(j->comline); 627 j->comline = NULL; 628 return 0; 629 } else { 630 paralimit--; 631 return 1; 632 } 633 } 634 if (bg) 635 setsid(); 636 637 /* Set up the environment and run the command */ 638 pwd = NULL; 639 lcap = NULL; 640 if ((clean || username) && injail && sjuser && 641 get_user_info(j, username, &pwd, &lcap) < 0) 642 exit(1); 643 if (injail) { 644 /* jail_attach won't chdir along with its chroot. */ 645 path = string_param(j->intparams[KP_PATH]); 646 if (path && chdir(path) < 0) { 647 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 648 exit(1); 649 } 650 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 651 setfib(fib) < 0) { 652 jail_warnx(j, "setfib: %s", strerror(errno)); 653 exit(1); 654 } 655 if (jail_attach(j->jid) < 0) { 656 jail_warnx(j, "jail_attach: %s", strerror(errno)); 657 exit(1); 658 } 659 } 660 if (clean || username) { 661 if (!(injail && sjuser) && 662 get_user_info(j, username, &pwd, &lcap) < 0) 663 exit(1); 664 if (clean) { 665 term = getenv("TERM"); 666 environ = &cleanenv; 667 setenv("PATH", "/bin:/usr/bin", 0); 668 if (term != NULL) 669 setenv("TERM", term, 1); 670 } 671 if (setgid(pwd->pw_gid) < 0) { 672 jail_warnx(j, "setgid %d: %s", pwd->pw_gid, 673 strerror(errno)); 674 exit(1); 675 } 676 if (setusercontext(lcap, pwd, pwd->pw_uid, username 677 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 678 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 679 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 680 strerror(errno)); 681 exit(1); 682 } 683 login_close(lcap); 684 setenv("USER", pwd->pw_name, 1); 685 setenv("HOME", pwd->pw_dir, 1); 686 setenv("SHELL", 687 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 688 if (clean && chdir(pwd->pw_dir) < 0) { 689 jail_warnx(j, "chdir %s: %s", 690 pwd->pw_dir, strerror(errno)); 691 exit(1); 692 } 693 endpwent(); 694 } 695 696 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 697 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 698 exit(1); 699 } 700 closefrom(3); 701 execvp(argv[0], argv); 702 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 703 exit(1); 704} 705 706/* 707 * Add a process to the hash, tied to a jail. 708 */ 709static int 710add_proc(struct cfjail *j, pid_t pid) 711{ 712 struct kevent ke; 713 struct cfjail *tj; 714 struct phash *ph; 715 716 if (!kq && (kq = kqueue()) < 0) 717 err(1, "kqueue"); 718 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 719 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 720 if (errno == ESRCH) 721 return 0; 722 err(1, "kevent"); 723 } 724 ph = emalloc(sizeof(struct phash)); 725 ph->j = j; 726 ph->pid = pid; 727 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 728 j->nprocs++; 729 j->flags |= JF_SLEEPQ; 730 if (j->timeout.tv_sec == 0) 731 requeue(j, &sleeping); 732 else { 733 /* File the jail in the sleep queue acording to its timeout. */ 734 TAILQ_REMOVE(j->queue, j, tq); 735 TAILQ_FOREACH(tj, &sleeping, tq) { 736 if (!tj->timeout.tv_sec || 737 j->timeout.tv_sec < tj->timeout.tv_sec || 738 (j->timeout.tv_sec == tj->timeout.tv_sec && 739 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 740 TAILQ_INSERT_BEFORE(tj, j, tq); 741 break; 742 } 743 } 744 if (tj == NULL) 745 TAILQ_INSERT_TAIL(&sleeping, j, tq); 746 j->queue = &sleeping; 747 } 748 return 1; 749} 750 751/* 752 * Remove any processes from the hash that correspond to a jail. 753 */ 754static void 755clear_procs(struct cfjail *j) 756{ 757 struct kevent ke; 758 struct phash *ph, *tph; 759 int i; 760 761 j->nprocs = 0; 762 for (i = 0; i < PHASH_SIZE; i++) 763 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 764 if (ph->j == j) { 765 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 766 NOTE_EXIT, 0, NULL); 767 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 768 LIST_REMOVE(ph, le); 769 free(ph); 770 } 771} 772 773/* 774 * Find the jail that corresponds to an exited process. 775 */ 776static struct cfjail * 777find_proc(pid_t pid) 778{ 779 struct cfjail *j; 780 struct phash *ph; 781 782 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 783 if (ph->pid == pid) { 784 j = ph->j; 785 LIST_REMOVE(ph, le); 786 free(ph); 787 return --j->nprocs ? NULL : j; 788 } 789 return NULL; 790} 791 792/* 793 * Send SIGTERM to all processes in a jail and wait for them to die. 794 */ 795static int 796term_procs(struct cfjail *j) 797{ 798 struct kinfo_proc *ki; 799 int i, noted, pcnt, timeout; 800 801 static kvm_t *kd; 802 803 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 804 timeout = DEFAULT_STOP_TIMEOUT; 805 else if (timeout == 0) 806 return 0; 807 808 if (kd == NULL) { 809 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 810 if (kd == NULL) 811 return 0; 812 } 813 814 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 815 if (ki == NULL) 816 return 0; 817 noted = 0; 818 for (i = 0; i < pcnt; i++) 819 if (ki[i].ki_jid == j->jid && 820 kill(ki[i].ki_pid, SIGTERM) == 0) { 821 (void)add_proc(j, ki[i].ki_pid); 822 if (verbose > 0) { 823 if (!noted) { 824 noted = 1; 825 jail_note(j, "sent SIGTERM to:"); 826 } 827 printf(" %d", ki[i].ki_pid); 828 } 829 } 830 if (noted) 831 printf("\n"); 832 if (j->nprocs > 0) { 833 clock_gettime(CLOCK_REALTIME, &j->timeout); 834 j->timeout.tv_sec += timeout; 835 return 1; 836 } 837 return 0; 838} 839 840/* 841 * Look up a user in the passwd and login.conf files. 842 */ 843static int 844get_user_info(struct cfjail *j, const char *username, 845 const struct passwd **pwdp, login_cap_t **lcapp) 846{ 847 const struct passwd *pwd; 848 849 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 850 if (pwd == NULL) { 851 if (errno) 852 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 853 username ? username : "", strerror(errno)); 854 else if (username) 855 jail_warnx(j, "%s: no such user", username); 856 else 857 jail_warnx(j, "unknown uid %d", getuid()); 858 return -1; 859 } 860 *lcapp = login_getpwclass(pwd); 861 if (*lcapp == NULL) { 862 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 863 strerror(errno)); 864 return -1; 865 } 866 /* Set the groups while the group file is still available */ 867 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 868 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 869 strerror(errno)); 870 return -1; 871 } 872 return 0; 873} 874 875/* 876 * Make sure a mount or consolelog path is a valid absolute pathname 877 * with no symlinks. 878 */ 879static int 880check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 881 const char *umount_type) 882{ 883 struct stat st, mpst; 884 struct statfs stfs; 885 char *tpath, *p; 886 const char *jailpath; 887 size_t jplen; 888 889 if (path[0] != '/') { 890 jail_warnx(j, "%s: %s: not an absolute pathname", 891 pname, path); 892 return -1; 893 } 894 /* 895 * Only check for symlinks in components below the jail's path, 896 * since that's where the security risk lies. 897 */ 898 jailpath = string_param(j->intparams[KP_PATH]); 899 if (jailpath == NULL) 900 jailpath = ""; 901 jplen = strlen(jailpath); 902 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 903 tpath = alloca(strlen(path) + 1); 904 strcpy(tpath, path); 905 for (p = tpath + jplen; p != NULL; ) { 906 p = strchr(p + 1, '/'); 907 if (p) 908 *p = '\0'; 909 if (lstat(tpath, &st) < 0) { 910 if (errno == ENOENT && isfile && !p) 911 break; 912 jail_warnx(j, "%s: %s: %s", pname, tpath, 913 strerror(errno)); 914 return -1; 915 } 916 if (S_ISLNK(st.st_mode)) { 917 jail_warnx(j, "%s: %s is a symbolic link", 918 pname, tpath); 919 return -1; 920 } 921 if (p) 922 *p = '/'; 923 } 924 } 925 if (umount_type != NULL) { 926 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 927 jail_warnx(j, "%s: %s: %s", pname, path, 928 strerror(errno)); 929 return -1; 930 } 931 if (stat(stfs.f_mntonname, &mpst) < 0) { 932 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 933 strerror(errno)); 934 return -1; 935 } 936 if (st.st_ino != mpst.st_ino) { 937 jail_warnx(j, "%s: %s: not a mount point", 938 pname, path); 939 return -1; 940 } 941 if (strcmp(stfs.f_fstypename, umount_type)) { 942 jail_warnx(j, "%s: %s: not a %s mount", 943 pname, path, umount_type); 944 return -1; 945 } 946 } 947 return 0; 948} 949