command.c revision 256387
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 256387 2013-10-12 17:46:13Z hrs $"); 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; 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 argv = alloca(8 * sizeof(char *)); 321 *(const char **)&argv[0] = _PATH_IFCONFIG; 322 if ((cs = strchr(comstring->s, '|'))) { 323 argv[1] = alloca(cs - comstring->s + 1); 324 strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 325 addr = cs + 1; 326 } else { 327 *(const char **)&argv[1] = 328 string_param(j->intparams[IP_INTERFACE]); 329 addr = comstring->s; 330 } 331 *(const char **)&argv[2] = "inet"; 332 if (!(cs = strchr(addr, '/'))) { 333 argv[3] = addr; 334 *(const char **)&argv[4] = "netmask"; 335 *(const char **)&argv[5] = "255.255.255.255"; 336 argc = 6; 337 } else if (strchr(cs + 1, '.')) { 338 argv[3] = alloca(cs - addr + 1); 339 strlcpy(argv[3], addr, cs - addr + 1); 340 *(const char **)&argv[4] = "netmask"; 341 *(const char **)&argv[5] = cs + 1; 342 argc = 6; 343 } else { 344 argv[3] = addr; 345 argc = 4; 346 } 347 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 348 argv[argc + 1] = NULL; 349 break; 350#endif 351 352#ifdef INET6 353 case IP__IP6_IFADDR: 354 argv = alloca(8 * sizeof(char *)); 355 *(const char **)&argv[0] = _PATH_IFCONFIG; 356 if ((cs = strchr(comstring->s, '|'))) { 357 argv[1] = alloca(cs - comstring->s + 1); 358 strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 359 addr = cs + 1; 360 } else { 361 *(const char **)&argv[1] = 362 string_param(j->intparams[IP_INTERFACE]); 363 addr = comstring->s; 364 } 365 *(const char **)&argv[2] = "inet6"; 366 argv[3] = addr; 367 if (!(cs = strchr(addr, '/'))) { 368 *(const char **)&argv[4] = "prefixlen"; 369 *(const char **)&argv[5] = "128"; 370 argc = 6; 371 } else 372 argc = 4; 373 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 374 argv[argc + 1] = NULL; 375 break; 376#endif 377 378 case IP_VNET_INTERFACE: 379 argv = alloca(5 * sizeof(char *)); 380 *(const char **)&argv[0] = _PATH_IFCONFIG; 381 argv[1] = comstring->s; 382 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 383 jidstr = string_param(j->intparams[KP_JID]); 384 *(const char **)&argv[3] = 385 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 386 argv[4] = NULL; 387 break; 388 389 case IP_MOUNT: 390 case IP__MOUNT_FROM_FSTAB: 391 argv = alloca(8 * sizeof(char *)); 392 comcs = alloca(comstring->len + 1); 393 strcpy(comcs, comstring->s); 394 argc = 0; 395 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 396 cs = strtok(NULL, " \t\f\v\r\n")) 397 argv[argc++] = cs; 398 if (argc == 0) 399 return 0; 400 if (argc < 3) { 401 jail_warnx(j, "%s: %s: missing information", 402 j->intparams[comparam]->name, comstring->s); 403 return -1; 404 } 405 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 406 down ? argv[2] : NULL) < 0) 407 return -1; 408 if (down) { 409 argv[4] = NULL; 410 argv[3] = argv[1]; 411 *(const char **)&argv[0] = "/sbin/umount"; 412 } else { 413 if (argc == 4) { 414 argv[7] = NULL; 415 argv[6] = argv[1]; 416 argv[5] = argv[0]; 417 argv[4] = argv[3]; 418 *(const char **)&argv[3] = "-o"; 419 } else { 420 argv[5] = NULL; 421 argv[4] = argv[1]; 422 argv[3] = argv[0]; 423 } 424 *(const char **)&argv[0] = _PATH_MOUNT; 425 } 426 *(const char **)&argv[1] = "-t"; 427 break; 428 429 case IP_MOUNT_DEVFS: 430 argv = alloca(7 * sizeof(char *)); 431 path = string_param(j->intparams[KP_PATH]); 432 if (path == NULL) { 433 jail_warnx(j, "mount.devfs: no path"); 434 return -1; 435 } 436 devpath = alloca(strlen(path) + 5); 437 sprintf(devpath, "%s/dev", path); 438 if (check_path(j, "mount.devfs", devpath, 0, 439 down ? "devfs" : NULL) < 0) 440 return -1; 441 if (down) { 442 *(const char **)&argv[0] = "/sbin/umount"; 443 argv[1] = devpath; 444 argv[2] = NULL; 445 } else { 446 *(const char **)&argv[0] = _PATH_MOUNT; 447 *(const char **)&argv[1] = "-t"; 448 *(const char **)&argv[2] = "devfs"; 449 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 450 if (!ruleset) 451 ruleset = "4"; /* devfsrules_jail */ 452 argv[3] = alloca(11 + strlen(ruleset)); 453 sprintf(argv[3], "-oruleset=%s", ruleset); 454 *(const char **)&argv[4] = "."; 455 argv[5] = devpath; 456 argv[6] = NULL; 457 } 458 break; 459 460 case IP_MOUNT_FDESCFS: 461 argv = alloca(7 * sizeof(char *)); 462 path = string_param(j->intparams[KP_PATH]); 463 if (path == NULL) { 464 jail_warnx(j, "mount.fdescfs: no path"); 465 return -1; 466 } 467 devpath = alloca(strlen(path) + 8); 468 sprintf(devpath, "%s/dev/fd", path); 469 if (check_path(j, "mount.fdescfs", devpath, 0, 470 down ? "fdescfs" : NULL) < 0) 471 return -1; 472 if (down) { 473 *(const char **)&argv[0] = "/sbin/umount"; 474 argv[1] = devpath; 475 argv[2] = NULL; 476 } else { 477 *(const char **)&argv[0] = _PATH_MOUNT; 478 *(const char **)&argv[1] = "-t"; 479 *(const char **)&argv[2] = "fdescfs"; 480 *(const char **)&argv[3] = "."; 481 argv[4] = devpath; 482 argv[5] = NULL; 483 } 484 break; 485 486 case IP_COMMAND: 487 if (j->name != NULL) 488 goto default_command; 489 argc = 0; 490 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 491 argc++; 492 argv = alloca((argc + 1) * sizeof(char *)); 493 argc = 0; 494 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 495 argv[argc++] = s->s; 496 argv[argc] = NULL; 497 j->comstring = &dummystring; 498 break; 499 500 default: 501 default_command: 502 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 503 !(cs[0] == '&' && cs[1] == '\0')) { 504 argv = alloca(4 * sizeof(char *)); 505 *(const char **)&argv[0] = _PATH_BSHELL; 506 *(const char **)&argv[1] = "-c"; 507 argv[2] = comstring->s; 508 argv[3] = NULL; 509 } else { 510 if (cs) { 511 *cs = 0; 512 bg = 1; 513 } 514 comcs = alloca(comstring->len + 1); 515 strcpy(comcs, comstring->s); 516 argc = 0; 517 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 518 cs = strtok(NULL, " \t\f\v\r\n")) 519 argc++; 520 argv = alloca((argc + 1) * sizeof(char *)); 521 strcpy(comcs, comstring->s); 522 argc = 0; 523 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 524 cs = strtok(NULL, " \t\f\v\r\n")) 525 argv[argc++] = cs; 526 argv[argc] = NULL; 527 } 528 } 529 if (argv[0] == NULL) 530 return 0; 531 532 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 533 timeout != 0) { 534 clock_gettime(CLOCK_REALTIME, &j->timeout); 535 j->timeout.tv_sec += timeout; 536 } else 537 j->timeout.tv_sec = 0; 538 539 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 540 comparam == IP_EXEC_STOP; 541 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 542 username = string_param(j->intparams[injail 543 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 544 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 545 546 consfd = 0; 547 if (injail && 548 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 549 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 550 return -1; 551 consfd = 552 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 553 if (consfd < 0) { 554 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 555 return -1; 556 } 557 } 558 559 comlen = 0; 560 for (i = 0; argv[i]; i++) 561 comlen += strlen(argv[i]) + 1; 562 j->comline = cs = emalloc(comlen); 563 for (i = 0; argv[i]; i++) { 564 strcpy(cs, argv[i]); 565 if (argv[i + 1]) { 566 cs += strlen(argv[i]) + 1; 567 cs[-1] = ' '; 568 } 569 } 570 if (verbose > 0) 571 jail_note(j, "run command%s%s%s: %s\n", 572 injail ? " in jail" : "", username ? " as " : "", 573 username ? username : "", j->comline); 574 575 pid = fork(); 576 if (pid < 0) 577 err(1, "fork"); 578 if (pid > 0) { 579 if (bg || !add_proc(j, pid)) { 580 free(j->comline); 581 j->comline = NULL; 582 return 0; 583 } else { 584 paralimit--; 585 return 1; 586 } 587 } 588 if (bg) 589 setsid(); 590 591 /* Set up the environment and run the command */ 592 pwd = NULL; 593 lcap = NULL; 594 if ((clean || username) && injail && sjuser && 595 get_user_info(j, username, &pwd, &lcap) < 0) 596 exit(1); 597 if (injail) { 598 /* jail_attach won't chdir along with its chroot. */ 599 path = string_param(j->intparams[KP_PATH]); 600 if (path && chdir(path) < 0) { 601 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 602 exit(1); 603 } 604 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 605 setfib(fib) < 0) { 606 jail_warnx(j, "setfib: %s", strerror(errno)); 607 exit(1); 608 } 609 if (jail_attach(j->jid) < 0) { 610 jail_warnx(j, "jail_attach: %s", strerror(errno)); 611 exit(1); 612 } 613 } 614 if (clean || username) { 615 if (!(injail && sjuser) && 616 get_user_info(j, username, &pwd, &lcap) < 0) 617 exit(1); 618 if (clean) { 619 term = getenv("TERM"); 620 environ = &cleanenv; 621 setenv("PATH", "/bin:/usr/bin", 0); 622 if (term != NULL) 623 setenv("TERM", term, 1); 624 } 625 if (setusercontext(lcap, pwd, pwd->pw_uid, username 626 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 627 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 628 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 629 strerror(errno)); 630 exit(1); 631 } 632 login_close(lcap); 633 setenv("USER", pwd->pw_name, 1); 634 setenv("HOME", pwd->pw_dir, 1); 635 setenv("SHELL", 636 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 637 if (clean && chdir(pwd->pw_dir) < 0) { 638 jail_warnx(j, "chdir %s: %s", 639 pwd->pw_dir, strerror(errno)); 640 exit(1); 641 } 642 endpwent(); 643 } 644 645 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 646 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 647 exit(1); 648 } 649 closefrom(3); 650 execvp(argv[0], argv); 651 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 652 exit(1); 653} 654 655/* 656 * Add a process to the hash, tied to a jail. 657 */ 658static int 659add_proc(struct cfjail *j, pid_t pid) 660{ 661 struct kevent ke; 662 struct cfjail *tj; 663 struct phash *ph; 664 665 if (!kq && (kq = kqueue()) < 0) 666 err(1, "kqueue"); 667 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 668 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 669 if (errno == ESRCH) 670 return 0; 671 err(1, "kevent"); 672 } 673 ph = emalloc(sizeof(struct phash)); 674 ph->j = j; 675 ph->pid = pid; 676 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 677 j->nprocs++; 678 j->flags |= JF_SLEEPQ; 679 if (j->timeout.tv_sec == 0) 680 requeue(j, &sleeping); 681 else { 682 /* File the jail in the sleep queue acording to its timeout. */ 683 TAILQ_REMOVE(j->queue, j, tq); 684 TAILQ_FOREACH(tj, &sleeping, tq) { 685 if (!tj->timeout.tv_sec || 686 j->timeout.tv_sec < tj->timeout.tv_sec || 687 (j->timeout.tv_sec == tj->timeout.tv_sec && 688 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 689 TAILQ_INSERT_BEFORE(tj, j, tq); 690 break; 691 } 692 } 693 if (tj == NULL) 694 TAILQ_INSERT_TAIL(&sleeping, j, tq); 695 j->queue = &sleeping; 696 } 697 return 1; 698} 699 700/* 701 * Remove any processes from the hash that correspond to a jail. 702 */ 703static void 704clear_procs(struct cfjail *j) 705{ 706 struct kevent ke; 707 struct phash *ph, *tph; 708 int i; 709 710 j->nprocs = 0; 711 for (i = 0; i < PHASH_SIZE; i++) 712 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 713 if (ph->j == j) { 714 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 715 NOTE_EXIT, 0, NULL); 716 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 717 LIST_REMOVE(ph, le); 718 free(ph); 719 } 720} 721 722/* 723 * Find the jail that corresponds to an exited process. 724 */ 725static struct cfjail * 726find_proc(pid_t pid) 727{ 728 struct cfjail *j; 729 struct phash *ph; 730 731 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 732 if (ph->pid == pid) { 733 j = ph->j; 734 LIST_REMOVE(ph, le); 735 free(ph); 736 return --j->nprocs ? NULL : j; 737 } 738 return NULL; 739} 740 741/* 742 * Send SIGTERM to all processes in a jail and wait for them to die. 743 */ 744static int 745term_procs(struct cfjail *j) 746{ 747 struct kinfo_proc *ki; 748 int i, noted, pcnt, timeout; 749 750 static kvm_t *kd; 751 752 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 753 timeout = DEFAULT_STOP_TIMEOUT; 754 else if (timeout == 0) 755 return 0; 756 757 if (kd == NULL) { 758 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 759 if (kd == NULL) 760 return 0; 761 } 762 763 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 764 if (ki == NULL) 765 return 0; 766 noted = 0; 767 for (i = 0; i < pcnt; i++) 768 if (ki[i].ki_jid == j->jid && 769 kill(ki[i].ki_pid, SIGTERM) == 0) { 770 (void)add_proc(j, ki[i].ki_pid); 771 if (verbose > 0) { 772 if (!noted) { 773 noted = 1; 774 jail_note(j, "sent SIGTERM to:"); 775 } 776 printf(" %d", ki[i].ki_pid); 777 } 778 } 779 if (noted) 780 printf("\n"); 781 if (j->nprocs > 0) { 782 clock_gettime(CLOCK_REALTIME, &j->timeout); 783 j->timeout.tv_sec += timeout; 784 return 1; 785 } 786 return 0; 787} 788 789/* 790 * Look up a user in the passwd and login.conf files. 791 */ 792static int 793get_user_info(struct cfjail *j, const char *username, 794 const struct passwd **pwdp, login_cap_t **lcapp) 795{ 796 const struct passwd *pwd; 797 798 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 799 if (pwd == NULL) { 800 if (errno) 801 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 802 username ? username : "", strerror(errno)); 803 else if (username) 804 jail_warnx(j, "%s: no such user", username); 805 else 806 jail_warnx(j, "unknown uid %d", getuid()); 807 return -1; 808 } 809 *lcapp = login_getpwclass(pwd); 810 if (*lcapp == NULL) { 811 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 812 strerror(errno)); 813 return -1; 814 } 815 /* Set the groups while the group file is still available */ 816 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 817 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 818 strerror(errno)); 819 return -1; 820 } 821 return 0; 822} 823 824/* 825 * Make sure a mount or consolelog path is a valid absolute pathname 826 * with no symlinks. 827 */ 828static int 829check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 830 const char *umount_type) 831{ 832 struct stat st, mpst; 833 struct statfs stfs; 834 char *tpath, *p; 835 const char *jailpath; 836 size_t jplen; 837 838 if (path[0] != '/') { 839 jail_warnx(j, "%s: %s: not an absolute pathname", 840 pname, path); 841 return -1; 842 } 843 /* 844 * Only check for symlinks in components below the jail's path, 845 * since that's where the security risk lies. 846 */ 847 jailpath = string_param(j->intparams[KP_PATH]); 848 if (jailpath == NULL) 849 jailpath = ""; 850 jplen = strlen(jailpath); 851 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 852 tpath = alloca(strlen(path) + 1); 853 strcpy(tpath, path); 854 for (p = tpath + jplen; p != NULL; ) { 855 p = strchr(p + 1, '/'); 856 if (p) 857 *p = '\0'; 858 if (lstat(tpath, &st) < 0) { 859 if (errno == ENOENT && isfile && !p) 860 break; 861 jail_warnx(j, "%s: %s: %s", pname, tpath, 862 strerror(errno)); 863 return -1; 864 } 865 if (S_ISLNK(st.st_mode)) { 866 jail_warnx(j, "%s: %s is a symbolic link", 867 pname, tpath); 868 return -1; 869 } 870 if (p) 871 *p = '/'; 872 } 873 } 874 if (umount_type != NULL) { 875 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 876 jail_warnx(j, "%s: %s: %s", pname, path, 877 strerror(errno)); 878 return -1; 879 } 880 if (stat(stfs.f_mntonname, &mpst) < 0) { 881 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 882 strerror(errno)); 883 return -1; 884 } 885 if (st.st_ino != mpst.st_ino) { 886 jail_warnx(j, "%s: %s: not a mount point", 887 pname, path); 888 return -1; 889 } 890 if (strcmp(stfs.f_fstypename, umount_type)) { 891 jail_warnx(j, "%s: %s: not a %s mount", 892 pname, path, umount_type); 893 return -1; 894 } 895 } 896 return 0; 897} 898