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