command.c revision 223190
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: projects/jailconf/usr.sbin/jail/command.c 223190 2011-06-17 16:21:03Z 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 void 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 phhead phash[PHASH_SIZE]; 81static int kq; 82 83/* 84 * Run the next command associated with a jail. 85 */ 86int 87next_command(struct cfjail *j) 88{ 89 const struct cfstring *comstring; 90 enum intparam comparam; 91 int rval, create_failed; 92 93 static struct cfstring dummystring = { .len = 1 }; 94 95 rval = 0; 96 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 97 for (; (comparam = *j->comparam) && comparam != IP__OP; 98 j->comparam += create_failed ? -1 : 1) { 99 if (j->comstring == NULL) { 100 switch (comparam) { 101 case IP_MOUNT_DEVFS: 102 if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 103 continue; 104 /* FALLTHROUGH */ 105 case IP_STOP_TIMEOUT: 106 j->comstring = &dummystring; 107 break; 108 default: 109 if (j->intparams[comparam] == NULL) 110 continue; 111 j->comstring = create_failed 112 ? TAILQ_LAST(&j->intparams[comparam]->val, 113 cfstrings) 114 : TAILQ_FIRST(&j->intparams[comparam]->val); 115 } 116 } 117 for (; j->comstring != NULL; 118 j->comstring = create_failed 119 ? TAILQ_PREV(j->comstring, cfstrings, tq) 120 : TAILQ_NEXT(j->comstring, tq)) { 121 if (rval != 0) 122 return rval; 123 if (j->comstring->len == 0 || (create_failed && 124 (comparam == IP_EXEC_PRESTART || comparam == 125 IP_EXEC_START || comparam == IP_COMMAND || 126 comparam == IP_EXEC_POSTSTART))) 127 continue; 128 if (paralimit == 0) { 129 requeue(j, &runnable); 130 return 1; 131 } 132 rval = run_command(j); 133 create_failed = 134 (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 135 } 136 } 137 return rval; 138} 139 140/* 141 * Check command exit status 142 */ 143int 144finish_command(struct cfjail *j) 145{ 146 int error; 147 148 if (!(j->flags & JF_SLEEPQ)) 149 return 0; 150 j->flags &= ~JF_SLEEPQ; 151 if (*j->comparam != IP_STOP_TIMEOUT) { 152 paralimit++; 153 if (!TAILQ_EMPTY(&runnable)) 154 requeue(TAILQ_FIRST(&runnable), &ready); 155 } 156 error = 0; 157 if (j->flags & JF_TIMEOUT) { 158 j->flags &= ~JF_TIMEOUT; 159 if (*j->comparam != IP_STOP_TIMEOUT) { 160 jail_warnx(j, "%s: timed out", j->comline); 161 failed(j); 162 error = -1; 163 } else if (verbose > 0) 164 jail_note(j, "timed out\n"); 165 } else if (j->pstatus != 0) { 166 if (WIFSIGNALED(j->pstatus)) 167 jail_warnx(j, "%s: exited on signal %d", 168 j->comline, WTERMSIG(j->pstatus)); 169 else 170 jail_warnx(j, "%s: failed", j->comline); 171 j->pstatus = 0; 172 failed(j); 173 error = -1; 174 } 175 free(j->comline); 176 j->comline = NULL; 177 return error; 178} 179 180/* 181 * Check for finished processed or timeouts. 182 */ 183struct cfjail * 184next_proc(int nonblock) 185{ 186 struct kevent ke; 187 struct timespec ts; 188 struct timespec *tsp; 189 struct cfjail *j; 190 191 if (!TAILQ_EMPTY(&sleeping)) { 192 again: 193 tsp = NULL; 194 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 195 clock_gettime(CLOCK_REALTIME, &ts); 196 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 197 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 198 if (ts.tv_nsec < 0) { 199 ts.tv_sec--; 200 ts.tv_nsec += 1000000000; 201 } 202 if (ts.tv_sec < 0 || 203 (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 204 j->flags |= JF_TIMEOUT; 205 clear_procs(j); 206 return j; 207 } 208 tsp = &ts; 209 } 210 if (nonblock) { 211 ts.tv_sec = 0; 212 ts.tv_nsec = 0; 213 tsp = &ts; 214 } 215 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 216 case -1: 217 if (errno != EINTR) 218 err(1, "kevent"); 219 goto again; 220 case 0: 221 if (!nonblock) { 222 j = TAILQ_FIRST(&sleeping); 223 j->flags |= JF_TIMEOUT; 224 clear_procs(j); 225 return j; 226 } 227 break; 228 case 1: 229 (void)waitpid(ke.ident, NULL, WNOHANG); 230 if ((j = find_proc(ke.ident))) { 231 j->pstatus = ke.data; 232 return j; 233 } 234 goto again; 235 } 236 } 237 return NULL; 238} 239 240/* 241 * Run a single command for a jail, possible inside the jail. 242 */ 243int 244run_command(struct cfjail *j) 245{ 246 const struct passwd *pwd; 247 const struct cfstring *comstring, *s; 248 login_cap_t *lcap; 249 char **argv; 250 char *cs, *addr, *comcs, *devpath; 251 const char *jidstr, *conslog, *path, *ruleset, *term, *username; 252 enum intparam comparam; 253 size_t comlen; 254 pid_t pid; 255 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 256 257 static char *cleanenv; 258 259 /* 260 * Collect exec arguments. Internal commands for network and 261 * mounting build their own argument lists. 262 */ 263 comparam = *j->comparam; 264 comstring = j->comstring; 265 bg = 0; 266 down = j->flags & (JF_STOP | JF_FAILED); 267 switch (comparam) { 268 case IP_STOP_TIMEOUT: 269 /* This isn't really a command */ 270 return term_procs(j); 271 272 case IP__IP4_IFADDR: 273 argv = alloca(8 * sizeof(char *)); 274 *(const char **)&argv[0] = _PATH_IFCONFIG; 275 if ((cs = strchr(comstring->s, '|'))) { 276 argv[1] = alloca(cs - comstring->s + 1); 277 strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 278 addr = cs + 1; 279 } else { 280 *(const char **)&argv[1] = 281 string_param(j->intparams[IP_INTERFACE]); 282 addr = comstring->s; 283 } 284 *(const char **)&argv[2] = "inet"; 285 if (!(cs = strchr(addr, '/'))) { 286 argv[3] = addr; 287 *(const char **)&argv[4] = "netmask"; 288 *(const char **)&argv[5] = "255.255.255.255"; 289 argc = 6; 290 } else if (strchr(cs + 1, '.')) { 291 argv[3] = alloca(cs - addr + 1); 292 strlcpy(argv[3], addr, cs - addr + 1); 293 *(const char **)&argv[4] = "netmask"; 294 *(const char **)&argv[5] = cs + 1; 295 argc = 6; 296 } else { 297 argv[3] = addr; 298 argc = 4; 299 } 300 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 301 argv[argc + 1] = NULL; 302 break; 303 304#ifdef INET6 305 case IP__IP6_IFADDR: 306 argv = alloca(8 * sizeof(char *)); 307 *(const char **)&argv[0] = _PATH_IFCONFIG; 308 if ((cs = strchr(comstring->s, '|'))) { 309 argv[1] = alloca(cs - comstring->s + 1); 310 strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 311 addr = cs + 1; 312 } else { 313 *(const char **)&argv[1] = 314 string_param(j->intparams[IP_INTERFACE]); 315 addr = comstring->s; 316 } 317 *(const char **)&argv[2] = "inet6"; 318 argv[3] = addr; 319 if (!(cs = strchr(addr, '/'))) { 320 *(const char **)&argv[4] = "prefixlen"; 321 *(const char **)&argv[5] = "128"; 322 argc = 6; 323 } else 324 argc = 4; 325 *(const char **)&argv[argc] = down ? "-alias" : "alias"; 326 argv[argc + 1] = NULL; 327 break; 328#endif 329 330 case IP_VNET_INTERFACE: 331 argv = alloca(5 * sizeof(char *)); 332 *(const char **)&argv[0] = _PATH_IFCONFIG; 333 argv[1] = comstring->s; 334 *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 335 jidstr = string_param(j->intparams[KP_JID]); 336 *(const char **)&argv[3] = 337 jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 338 argv[4] = NULL; 339 break; 340 341 case IP_MOUNT: 342 case IP__MOUNT_FROM_FSTAB: 343 argv = alloca(8 * sizeof(char *)); 344 comcs = alloca(comstring->len + 1); 345 strcpy(comcs, comstring->s); 346 argc = 0; 347 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 348 cs = strtok(NULL, " \t\f\v\r\n")) 349 argv[argc++] = cs; 350 if (argc == 0) 351 return 0; 352 if (argc < 3) { 353 jail_warnx(j, "%s: %s: missing information", 354 j->intparams[comparam]->name, comstring->s); 355 failed(j); 356 return -1; 357 } 358 if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 359 down ? argv[2] : NULL) < 0) { 360 failed(j); 361 return -1; 362 } 363 if (down) { 364 argv[4] = NULL; 365 argv[3] = argv[1]; 366 *(const char **)&argv[0] = "/sbin/umount"; 367 } else { 368 if (argc == 4) { 369 argv[7] = NULL; 370 argv[6] = argv[1]; 371 argv[5] = argv[0]; 372 argv[4] = argv[3]; 373 *(const char **)&argv[3] = "-o"; 374 } else { 375 argv[5] = NULL; 376 argv[4] = argv[1]; 377 argv[3] = argv[0]; 378 } 379 *(const char **)&argv[0] = _PATH_MOUNT; 380 } 381 *(const char **)&argv[1] = "-t"; 382 break; 383 384 case IP_MOUNT_DEVFS: 385 path = string_param(j->intparams[KP_PATH]); 386 if (path == NULL) { 387 jail_warnx(j, "mount.devfs: no path"); 388 failed(j); 389 return -1; 390 } 391 devpath = alloca(strlen(path) + 5); 392 sprintf(devpath, "%s/dev", path); 393 if (check_path(j, "mount.devfs", devpath, 0, 394 down ? "devfs" : NULL) < 0) { 395 failed(j); 396 return -1; 397 } 398 if (down) { 399 argv = alloca(3 * sizeof(char *)); 400 *(const char **)&argv[0] = "/sbin/umount"; 401 argv[1] = devpath; 402 argv[2] = NULL; 403 } else { 404 argv = alloca(4 * sizeof(char *)); 405 *(const char **)&argv[0] = _PATH_BSHELL; 406 *(const char **)&argv[1] = "-c"; 407 ruleset = string_param(j->intparams 408 [IP_MOUNT_DEVFS_RULESET]); 409 argv[2] = alloca(strlen(path) + 410 (ruleset ? strlen(ruleset) + 1 : 0) + 56); 411 sprintf(argv[2], ". /etc/rc.subr; load_rc_config .; " 412 "devfs_mount_jail %s/dev%s%s", path, 413 ruleset ? " " : "", ruleset ? ruleset : ""); 414 argv[3] = NULL; 415 } 416 break; 417 418 case IP_COMMAND: 419 if (j->name != NULL) 420 goto default_command; 421 argc = 0; 422 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 423 argc++; 424 argv = alloca((argc + 1) * sizeof(char *)); 425 argc = 0; 426 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 427 argv[argc++] = s->s; 428 argv[argc] = NULL; 429 j->comstring = NULL; 430 break; 431 432 default: 433 default_command: 434 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 435 !(cs[0] == '&' && cs[1] == '\0')) { 436 argv = alloca(4 * sizeof(char *)); 437 *(const char **)&argv[0] = _PATH_BSHELL; 438 *(const char **)&argv[1] = "-c"; 439 argv[2] = comstring->s; 440 argv[3] = NULL; 441 } else { 442 if (cs) { 443 *cs = 0; 444 bg = 1; 445 } 446 comcs = alloca(comstring->len + 1); 447 strcpy(comcs, comstring->s); 448 argc = 0; 449 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 450 cs = strtok(NULL, " \t\f\v\r\n")) 451 argc++; 452 argv = alloca((argc + 1) * sizeof(char *)); 453 strcpy(comcs, comstring->s); 454 argc = 0; 455 for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 456 cs = strtok(NULL, " \t\f\v\r\n")) 457 argv[argc++] = cs; 458 argv[argc] = NULL; 459 } 460 } 461 if (argv[0] == NULL) 462 return 0; 463 464 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 465 timeout != 0) { 466 clock_gettime(CLOCK_REALTIME, &j->timeout); 467 j->timeout.tv_sec += timeout; 468 } else 469 j->timeout.tv_sec = 0; 470 471 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 472 comparam == IP_EXEC_STOP; 473 clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 474 username = string_param(j->intparams[injail 475 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 476 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 477 478 consfd = 0; 479 if (injail && 480 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 481 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) { 482 failed(j); 483 return -1; 484 } 485 consfd = 486 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 487 if (consfd < 0) { 488 jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 489 failed(j); 490 return -1; 491 } 492 } 493 494 comlen = 0; 495 for (i = 0; argv[i]; i++) 496 comlen += strlen(argv[i]) + 1; 497 j->comline = cs = emalloc(comlen); 498 for (i = 0; argv[i]; i++) { 499 strcpy(cs, argv[i]); 500 if (argv[i + 1]) { 501 cs += strlen(argv[i]) + 1; 502 cs[-1] = ' '; 503 } 504 } 505 if (verbose > 0) 506 jail_note(j, "run command%s%s%s: %s\n", 507 injail ? " in jail" : "", username ? " as " : "", 508 username ? username : "", j->comline); 509 510 pid = fork(); 511 if (pid < 0) 512 err(1, "fork"); 513 if (pid > 0) { 514 if (bg) { 515 free(j->comline); 516 j->comline = NULL; 517 requeue(j, &ready); 518 } else { 519 paralimit--; 520 add_proc(j, pid); 521 } 522 return 1; 523 } 524 if (bg) 525 setsid(); 526 527 /* Set up the environment and run the command */ 528 pwd = NULL; 529 lcap = NULL; 530 if ((clean || username) && injail && sjuser && 531 get_user_info(j, username, &pwd, &lcap) < 0) 532 exit(1); 533 if (injail) { 534 /* jail_attach won't chdir along with its chroot. */ 535 path = string_param(j->intparams[KP_PATH]); 536 if (path && chdir(path) < 0) { 537 jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 538 exit(1); 539 } 540 if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 541 setfib(fib) < 0) { 542 jail_warnx(j, "setfib: %s", strerror(errno)); 543 exit(1); 544 } 545 if (jail_attach(j->jid) < 0) { 546 jail_warnx(j, "jail_attach: %s", strerror(errno)); 547 exit(1); 548 } 549 } 550 if (clean || username) { 551 if (!(injail && sjuser) && 552 get_user_info(j, username, &pwd, &lcap) < 0) 553 exit(1); 554 if (clean) { 555 term = getenv("TERM"); 556 environ = &cleanenv; 557 setenv("PATH", "/bin:/usr/bin", 0); 558 setenv("TERM", term, 1); 559 } 560 if (setusercontext(lcap, pwd, pwd->pw_uid, username 561 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 562 : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 563 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 564 strerror(errno)); 565 exit(1); 566 } 567 login_close(lcap); 568 setenv("USER", pwd->pw_name, 1); 569 setenv("HOME", pwd->pw_dir, 1); 570 setenv("SHELL", 571 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 572 if (clean && chdir(pwd->pw_dir) < 0) { 573 jail_warnx(j, "chdir %s: %s", 574 pwd->pw_dir, strerror(errno)); 575 exit(1); 576 } 577 endpwent(); 578 } 579 580 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 581 jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 582 exit(1); 583 } 584 closefrom(3); 585 execvp(argv[0], argv); 586 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 587 exit(1); 588} 589 590/* 591 * Add a process to the hash, tied to a jail. 592 */ 593static void 594add_proc(struct cfjail *j, pid_t pid) 595{ 596 struct kevent ke; 597 struct cfjail *tj; 598 struct phash *ph; 599 600 if (!kq && (kq = kqueue()) < 0) 601 err(1, "kqueue"); 602 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 603 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) 604 err(1, "kevent"); 605 ph = emalloc(sizeof(struct phash)); 606 ph->j = j; 607 ph->pid = pid; 608 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 609 j->nprocs++; 610 j->flags |= JF_SLEEPQ; 611 if (j->timeout.tv_sec == 0) 612 requeue(j, &sleeping); 613 else { 614 /* File the jail in the sleep queue acording to its timeout. */ 615 TAILQ_REMOVE(j->queue, j, tq); 616 TAILQ_FOREACH(tj, &sleeping, tq) { 617 if (!tj->timeout.tv_sec || 618 j->timeout.tv_sec < tj->timeout.tv_sec || 619 (j->timeout.tv_sec == tj->timeout.tv_sec && 620 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 621 TAILQ_INSERT_BEFORE(tj, j, tq); 622 break; 623 } 624 } 625 if (tj == NULL) 626 TAILQ_INSERT_TAIL(&sleeping, j, tq); 627 j->queue = &sleeping; 628 } 629} 630 631/* 632 * Remove any processes from the hash that correspond to a jail. 633 */ 634static void 635clear_procs(struct cfjail *j) 636{ 637 struct kevent ke; 638 struct phash *ph, *tph; 639 int i; 640 641 j->nprocs = 0; 642 for (i = 0; i < PHASH_SIZE; i++) 643 LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 644 if (ph->j == j) { 645 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 646 NOTE_EXIT, 0, NULL); 647 (void)kevent(kq, &ke, 1, NULL, 0, NULL); 648 LIST_REMOVE(ph, le); 649 free(ph); 650 } 651} 652 653/* 654 * Find the jail that corresponds to an exited process. 655 */ 656static struct cfjail * 657find_proc(pid_t pid) 658{ 659 struct cfjail *j; 660 struct phash *ph; 661 662 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 663 if (ph->pid == pid) { 664 j = ph->j; 665 LIST_REMOVE(ph, le); 666 free(ph); 667 return --j->nprocs ? NULL : j; 668 } 669 return NULL; 670} 671 672/* 673 * Send SIGTERM to all processes in a jail and wait for them to die. 674 */ 675static int 676term_procs(struct cfjail *j) 677{ 678 struct kinfo_proc *ki; 679 int i, noted, pcnt, timeout; 680 681 static kvm_t *kd; 682 683 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 684 timeout = DEFAULT_STOP_TIMEOUT; 685 else if (timeout == 0) 686 return 0; 687 688 if (kd == NULL) { 689 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "jail"); 690 if (kd == NULL) 691 exit(1); 692 } 693 694 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 695 if (ki == NULL) 696 exit(1); 697 noted = 0; 698 for (i = 0; i < pcnt; i++) 699 if (ki[i].ki_jid == j->jid && 700 kill(ki[i].ki_pid, SIGTERM) == 0) { 701 add_proc(j, ki[i].ki_pid); 702 if (verbose > 0) { 703 if (!noted) { 704 noted = 1; 705 jail_note(j, "sent SIGTERM to:"); 706 } 707 printf(" %d", ki[i].ki_pid); 708 } 709 } 710 if (noted) 711 printf("\n"); 712 if (j->nprocs > 0) { 713 clock_gettime(CLOCK_REALTIME, &j->timeout); 714 j->timeout.tv_sec += timeout; 715 return 1; 716 } 717 return 0; 718} 719 720/* 721 * Look up a user in the passwd and login.conf files. 722 */ 723static int 724get_user_info(struct cfjail *j, const char *username, 725 const struct passwd **pwdp, login_cap_t **lcapp) 726{ 727 const struct passwd *pwd; 728 729 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 730 if (pwd == NULL) { 731 if (errno) 732 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 733 username ? username : "", strerror(errno)); 734 else if (username) 735 jail_warnx(j, "%s: no such user", username); 736 else 737 jail_warnx(j, "unknown uid %d", getuid()); 738 return -1; 739 } 740 *lcapp = login_getpwclass(pwd); 741 if (*lcapp == NULL) { 742 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 743 strerror(errno)); 744 return -1; 745 } 746 /* Set the groups while the group file is still available */ 747 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 748 jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 749 strerror(errno)); 750 return -1; 751 } 752 return 0; 753} 754 755/* 756 * Make sure a mount or consolelog path is a valid absolute pathname 757 * with no symlinks. 758 */ 759static int 760check_path(struct cfjail *j, const char *pname, const char *path, int isfile, 761 const char *umount_type) 762{ 763 struct stat st, mpst; 764 struct statfs stfs; 765 char *tpath, *p; 766 const char *jailpath; 767 size_t jplen; 768 769 if (path[0] != '/') { 770 jail_warnx(j, "%s: %s: not an absolute pathname", 771 pname, path); 772 return -1; 773 } 774 /* 775 * Only check for symlinks in components below the jail's path, 776 * since that's where the security risk lies. 777 */ 778 jailpath = string_param(j->intparams[KP_PATH]); 779 if (jailpath == NULL) 780 jailpath = ""; 781 jplen = strlen(jailpath); 782 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 783 tpath = alloca(strlen(path) + 1); 784 strcpy(tpath, path); 785 for (p = tpath + jplen; p != NULL; ) { 786 p = strchr(p + 1, '/'); 787 if (p) 788 *p = '\0'; 789 if (lstat(tpath, &st) < 0) { 790 if (errno == ENOENT && isfile && !p) 791 break; 792 jail_warnx(j, "%s: %s: %s", pname, tpath, 793 strerror(errno)); 794 return -1; 795 } 796 if (S_ISLNK(st.st_mode)) { 797 jail_warnx(j, "%s: %s is a symbolic link", 798 pname, tpath); 799 return -1; 800 } 801 if (p) 802 *p = '/'; 803 } 804 } 805 if (umount_type != NULL) { 806 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 807 jail_warnx(j, "%s: %s: %s", pname, path, 808 strerror(errno)); 809 return -1; 810 } 811 if (stat(stfs.f_mntonname, &mpst) < 0) { 812 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 813 strerror(errno)); 814 return -1; 815 } 816 if (st.st_ino != mpst.st_ino) { 817 jail_warnx(j, "%s: %s: not a mount point", 818 pname, path); 819 return -1; 820 } 821 if (strcmp(stfs.f_fstypename, umount_type)) { 822 jail_warnx(j, "%s: %s: not a %s mount", 823 pname, path, umount_type); 824 return -1; 825 } 826 } 827 return 0; 828} 829