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