command.c revision 223368
1214117Sjamie/*- 2223190Sjamie * Copyright (c) 2011 James Gritton 3214117Sjamie * All rights reserved. 4214117Sjamie * 5214117Sjamie * Redistribution and use in source and binary forms, with or without 6214117Sjamie * modification, are permitted provided that the following conditions 7214117Sjamie * are met: 8214117Sjamie * 1. Redistributions of source code must retain the above copyright 9214117Sjamie * notice, this list of conditions and the following disclaimer. 10214117Sjamie * 2. Redistributions in binary form must reproduce the above copyright 11214117Sjamie * notice, this list of conditions and the following disclaimer in the 12214117Sjamie * documentation and/or other materials provided with the distribution. 13214117Sjamie * 14214117Sjamie * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15214117Sjamie * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16214117Sjamie * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17214117Sjamie * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18214117Sjamie * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19214117Sjamie * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20214117Sjamie * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21214117Sjamie * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22214117Sjamie * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23214117Sjamie * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24214117Sjamie * SUCH DAMAGE. 25214117Sjamie */ 26214117Sjamie 27214117Sjamie#include <sys/cdefs.h> 28214117Sjamie__FBSDID("$FreeBSD: projects/jailconf/usr.sbin/jail/command.c 223368 2011-06-21 19:13:48Z jamie $"); 29214117Sjamie 30214117Sjamie#include <sys/types.h> 31214117Sjamie#include <sys/event.h> 32214805Sjamie#include <sys/mount.h> 33214117Sjamie#include <sys/stat.h> 34214117Sjamie#include <sys/sysctl.h> 35214117Sjamie#include <sys/user.h> 36214117Sjamie#include <sys/wait.h> 37214117Sjamie 38214117Sjamie#include <err.h> 39214117Sjamie#include <errno.h> 40214117Sjamie#include <fcntl.h> 41214117Sjamie#include <kvm.h> 42214117Sjamie#include <login_cap.h> 43214117Sjamie#include <paths.h> 44214117Sjamie#include <pwd.h> 45214117Sjamie#include <signal.h> 46214117Sjamie#include <stdio.h> 47214117Sjamie#include <stdlib.h> 48214117Sjamie#include <string.h> 49214117Sjamie#include <unistd.h> 50214117Sjamie 51214117Sjamie#include "jailp.h" 52214117Sjamie 53214117Sjamie#define DEFAULT_STOP_TIMEOUT 10 54214117Sjamie#define PHASH_SIZE 256 55214117Sjamie 56214117SjamieLIST_HEAD(phhead, phash); 57214117Sjamie 58214117Sjamiestruct phash { 59214117Sjamie LIST_ENTRY(phash) le; 60214117Sjamie struct cfjail *j; 61214117Sjamie pid_t pid; 62214117Sjamie}; 63214117Sjamie 64216367Sjamieint paralimit = -1; 65216367Sjamie 66214117Sjamieextern char **environ; 67214117Sjamie 68223189Sjamiestatic int run_command(struct cfjail *j); 69214117Sjamiestatic void add_proc(struct cfjail *j, pid_t pid); 70214117Sjamiestatic void clear_procs(struct cfjail *j); 71214117Sjamiestatic struct cfjail *find_proc(pid_t pid); 72216367Sjamiestatic int term_procs(struct cfjail *j); 73223189Sjamiestatic int get_user_info(struct cfjail *j, const char *username, 74223189Sjamie const struct passwd **pwdp, login_cap_t **lcapp); 75214797Sjamiestatic int check_path(struct cfjail *j, const char *pname, const char *path, 76214805Sjamie int isfile, const char *umount_type); 77214117Sjamie 78214117Sjamiestatic struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping); 79214117Sjamiestatic struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable); 80223368Sjamiestatic struct cfstring dummystring = { .len = 1 }; 81214117Sjamiestatic struct phhead phash[PHASH_SIZE]; 82214117Sjamiestatic int kq; 83214117Sjamie 84214117Sjamie/* 85223189Sjamie * Run the next command associated with a jail. 86214117Sjamie */ 87214117Sjamieint 88223189Sjamienext_command(struct cfjail *j) 89214117Sjamie{ 90223189Sjamie enum intparam comparam; 91223189Sjamie int rval, create_failed; 92223189Sjamie 93223189Sjamie rval = 0; 94223189Sjamie create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 95223263Sjamie for (; (comparam = *j->comparam); 96223189Sjamie j->comparam += create_failed ? -1 : 1) { 97223189Sjamie if (j->comstring == NULL) { 98223189Sjamie switch (comparam) { 99223189Sjamie case IP_MOUNT_DEVFS: 100223189Sjamie if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 101223189Sjamie continue; 102223189Sjamie /* FALLTHROUGH */ 103223263Sjamie case IP__OP: 104223189Sjamie case IP_STOP_TIMEOUT: 105223189Sjamie j->comstring = &dummystring; 106223189Sjamie break; 107223189Sjamie default: 108223189Sjamie if (j->intparams[comparam] == NULL) 109223189Sjamie continue; 110223189Sjamie j->comstring = create_failed 111223189Sjamie ? TAILQ_LAST(&j->intparams[comparam]->val, 112223189Sjamie cfstrings) 113223189Sjamie : TAILQ_FIRST(&j->intparams[comparam]->val); 114223189Sjamie } 115223189Sjamie } 116223189Sjamie for (; j->comstring != NULL; 117223368Sjamie j->comstring = j->comstring == &dummystring ? NULL : 118223368Sjamie create_failed 119223189Sjamie ? TAILQ_PREV(j->comstring, cfstrings, tq) 120223189Sjamie : TAILQ_NEXT(j->comstring, tq)) { 121223189Sjamie if (rval != 0) 122223189Sjamie return rval; 123223189Sjamie if (j->comstring->len == 0 || (create_failed && 124223189Sjamie (comparam == IP_EXEC_PRESTART || comparam == 125223189Sjamie IP_EXEC_START || comparam == IP_COMMAND || 126223189Sjamie comparam == IP_EXEC_POSTSTART))) 127223189Sjamie continue; 128223189Sjamie if (paralimit == 0) { 129223189Sjamie requeue(j, &runnable); 130223189Sjamie return 1; 131223189Sjamie } 132223189Sjamie rval = run_command(j); 133223189Sjamie create_failed = 134223189Sjamie (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 135223189Sjamie } 136223189Sjamie } 137223189Sjamie return rval; 138223189Sjamie} 139223189Sjamie 140223189Sjamie/* 141223189Sjamie * Check command exit status 142223189Sjamie */ 143223189Sjamieint 144223189Sjamiefinish_command(struct cfjail *j) 145223189Sjamie{ 146223189Sjamie int error; 147223189Sjamie 148223189Sjamie if (!(j->flags & JF_SLEEPQ)) 149223189Sjamie return 0; 150223189Sjamie j->flags &= ~JF_SLEEPQ; 151223189Sjamie if (*j->comparam != IP_STOP_TIMEOUT) { 152223189Sjamie paralimit++; 153223189Sjamie if (!TAILQ_EMPTY(&runnable)) 154223189Sjamie requeue(TAILQ_FIRST(&runnable), &ready); 155223189Sjamie } 156223189Sjamie error = 0; 157223189Sjamie if (j->flags & JF_TIMEOUT) { 158223189Sjamie j->flags &= ~JF_TIMEOUT; 159223189Sjamie if (*j->comparam != IP_STOP_TIMEOUT) { 160223189Sjamie jail_warnx(j, "%s: timed out", j->comline); 161223189Sjamie failed(j); 162223189Sjamie error = -1; 163223189Sjamie } else if (verbose > 0) 164223189Sjamie jail_note(j, "timed out\n"); 165223189Sjamie } else if (j->pstatus != 0) { 166223189Sjamie if (WIFSIGNALED(j->pstatus)) 167223189Sjamie jail_warnx(j, "%s: exited on signal %d", 168223189Sjamie j->comline, WTERMSIG(j->pstatus)); 169223189Sjamie else 170223189Sjamie jail_warnx(j, "%s: failed", j->comline); 171223189Sjamie j->pstatus = 0; 172223189Sjamie failed(j); 173223189Sjamie error = -1; 174223189Sjamie } 175223189Sjamie free(j->comline); 176223189Sjamie j->comline = NULL; 177223189Sjamie return error; 178223189Sjamie} 179223189Sjamie 180223189Sjamie/* 181223189Sjamie * Check for finished processed or timeouts. 182223189Sjamie */ 183223189Sjamiestruct cfjail * 184223189Sjamienext_proc(int nonblock) 185223189Sjamie{ 186223189Sjamie struct kevent ke; 187223189Sjamie struct timespec ts; 188223189Sjamie struct timespec *tsp; 189223189Sjamie struct cfjail *j; 190223189Sjamie 191223189Sjamie if (!TAILQ_EMPTY(&sleeping)) { 192223189Sjamie again: 193223189Sjamie tsp = NULL; 194223189Sjamie if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 195223189Sjamie clock_gettime(CLOCK_REALTIME, &ts); 196223189Sjamie ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 197223189Sjamie ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 198223189Sjamie if (ts.tv_nsec < 0) { 199223189Sjamie ts.tv_sec--; 200223189Sjamie ts.tv_nsec += 1000000000; 201223189Sjamie } 202223189Sjamie if (ts.tv_sec < 0 || 203223189Sjamie (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 204223189Sjamie j->flags |= JF_TIMEOUT; 205223189Sjamie clear_procs(j); 206223189Sjamie return j; 207223189Sjamie } 208223189Sjamie tsp = &ts; 209223189Sjamie } 210223189Sjamie if (nonblock) { 211223189Sjamie ts.tv_sec = 0; 212223189Sjamie ts.tv_nsec = 0; 213223189Sjamie tsp = &ts; 214223189Sjamie } 215223189Sjamie switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 216223189Sjamie case -1: 217223189Sjamie if (errno != EINTR) 218223189Sjamie err(1, "kevent"); 219223189Sjamie goto again; 220223189Sjamie case 0: 221223189Sjamie if (!nonblock) { 222223189Sjamie j = TAILQ_FIRST(&sleeping); 223223189Sjamie j->flags |= JF_TIMEOUT; 224223189Sjamie clear_procs(j); 225223189Sjamie return j; 226223189Sjamie } 227223189Sjamie break; 228223189Sjamie case 1: 229223189Sjamie (void)waitpid(ke.ident, NULL, WNOHANG); 230223189Sjamie if ((j = find_proc(ke.ident))) { 231223189Sjamie j->pstatus = ke.data; 232223189Sjamie return j; 233223189Sjamie } 234223189Sjamie goto again; 235223189Sjamie } 236223189Sjamie } 237223189Sjamie return NULL; 238223189Sjamie} 239223189Sjamie 240223189Sjamie/* 241223189Sjamie * Run a single command for a jail, possible inside the jail. 242223189Sjamie */ 243223189Sjamieint 244223189Sjamierun_command(struct cfjail *j) 245223189Sjamie{ 246214117Sjamie const struct passwd *pwd; 247223189Sjamie const struct cfstring *comstring, *s; 248214117Sjamie login_cap_t *lcap; 249214117Sjamie char **argv; 250223351Sjamie char *cs, *comcs, *devpath; 251214117Sjamie const char *jidstr, *conslog, *path, *ruleset, *term, *username; 252223189Sjamie enum intparam comparam; 253214117Sjamie size_t comlen; 254214117Sjamie pid_t pid; 255214117Sjamie int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 256223351Sjamie#if defined(INET) || defined(INET6) 257223351Sjamie char *addr; 258223351Sjamie#endif 259214117Sjamie 260214117Sjamie static char *cleanenv; 261214117Sjamie 262223263Sjamie /* Perform some operations that aren't actually commands */ 263223263Sjamie comparam = *j->comparam; 264223263Sjamie down = j->flags & (JF_STOP | JF_FAILED); 265223263Sjamie switch (comparam) { 266223263Sjamie case IP_STOP_TIMEOUT: 267223263Sjamie return term_procs(j); 268223263Sjamie 269223263Sjamie case IP__OP: 270223263Sjamie if (down) { 271223263Sjamie if (jail_remove(j->jid) == 0 && verbose >= 0 && 272223263Sjamie (verbose > 0 || (j->flags & JF_STOP 273223263Sjamie ? note_remove : j->name != NULL))) 274223263Sjamie jail_note(j, "removed\n"); 275223263Sjamie j->jid = -1; 276223263Sjamie if (j->flags & JF_STOP) 277223263Sjamie dep_done(j, DF_LIGHT); 278223263Sjamie else 279223263Sjamie j->flags &= ~JF_PERSIST; 280223263Sjamie } else { 281223263Sjamie if (create_jail(j) < 0) { 282223263Sjamie failed(j); 283223263Sjamie return -1; 284223263Sjamie } 285223263Sjamie if (verbose >= 0 && (j->name || verbose > 0)) 286223263Sjamie jail_note(j, "created\n"); 287223263Sjamie dep_done(j, DF_LIGHT); 288223263Sjamie } 289223263Sjamie requeue(j, &ready); 290223263Sjamie return 1; 291223327Sjamie 292223327Sjamie default: ; 293223263Sjamie } 294214117Sjamie /* 295214117Sjamie * Collect exec arguments. Internal commands for network and 296216367Sjamie * mounting build their own argument lists. 297214117Sjamie */ 298223189Sjamie comstring = j->comstring; 299223189Sjamie bg = 0; 300216367Sjamie switch (comparam) { 301223351Sjamie#ifdef INET 302216367Sjamie case IP__IP4_IFADDR: 303214117Sjamie argv = alloca(8 * sizeof(char *)); 304214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 305214117Sjamie if ((cs = strchr(comstring->s, '|'))) { 306214117Sjamie argv[1] = alloca(cs - comstring->s + 1); 307214117Sjamie strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 308214117Sjamie addr = cs + 1; 309214117Sjamie } else { 310214117Sjamie *(const char **)&argv[1] = 311214117Sjamie string_param(j->intparams[IP_INTERFACE]); 312214117Sjamie addr = comstring->s; 313214117Sjamie } 314214117Sjamie *(const char **)&argv[2] = "inet"; 315214117Sjamie if (!(cs = strchr(addr, '/'))) { 316214117Sjamie argv[3] = addr; 317214117Sjamie *(const char **)&argv[4] = "netmask"; 318214117Sjamie *(const char **)&argv[5] = "255.255.255.255"; 319214117Sjamie argc = 6; 320214117Sjamie } else if (strchr(cs + 1, '.')) { 321214117Sjamie argv[3] = alloca(cs - addr + 1); 322214117Sjamie strlcpy(argv[3], addr, cs - addr + 1); 323214117Sjamie *(const char **)&argv[4] = "netmask"; 324214117Sjamie *(const char **)&argv[5] = cs + 1; 325214117Sjamie argc = 6; 326214117Sjamie } else { 327214117Sjamie argv[3] = addr; 328214117Sjamie argc = 4; 329214117Sjamie } 330214117Sjamie *(const char **)&argv[argc] = down ? "-alias" : "alias"; 331214117Sjamie argv[argc + 1] = NULL; 332216367Sjamie break; 333223351Sjamie#endif 334216367Sjamie 335214117Sjamie#ifdef INET6 336216367Sjamie case IP__IP6_IFADDR: 337214117Sjamie argv = alloca(8 * sizeof(char *)); 338214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 339214117Sjamie if ((cs = strchr(comstring->s, '|'))) { 340214117Sjamie argv[1] = alloca(cs - comstring->s + 1); 341214117Sjamie strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 342214117Sjamie addr = cs + 1; 343214117Sjamie } else { 344214117Sjamie *(const char **)&argv[1] = 345214117Sjamie string_param(j->intparams[IP_INTERFACE]); 346214117Sjamie addr = comstring->s; 347214117Sjamie } 348214117Sjamie *(const char **)&argv[2] = "inet6"; 349214117Sjamie argv[3] = addr; 350214117Sjamie if (!(cs = strchr(addr, '/'))) { 351214117Sjamie *(const char **)&argv[4] = "prefixlen"; 352214117Sjamie *(const char **)&argv[5] = "128"; 353214117Sjamie argc = 6; 354214117Sjamie } else 355214117Sjamie argc = 4; 356214117Sjamie *(const char **)&argv[argc] = down ? "-alias" : "alias"; 357214117Sjamie argv[argc + 1] = NULL; 358216367Sjamie break; 359214117Sjamie#endif 360216367Sjamie 361216367Sjamie case IP_VNET_INTERFACE: 362214117Sjamie argv = alloca(5 * sizeof(char *)); 363214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 364214117Sjamie argv[1] = comstring->s; 365214117Sjamie *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 366214117Sjamie jidstr = string_param(j->intparams[KP_JID]); 367214117Sjamie *(const char **)&argv[3] = 368214117Sjamie jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 369214117Sjamie argv[4] = NULL; 370216367Sjamie break; 371216367Sjamie 372216367Sjamie case IP_MOUNT: 373216367Sjamie case IP__MOUNT_FROM_FSTAB: 374214117Sjamie argv = alloca(8 * sizeof(char *)); 375214117Sjamie comcs = alloca(comstring->len + 1); 376214117Sjamie strcpy(comcs, comstring->s); 377214117Sjamie argc = 0; 378214117Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 379214117Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 380214117Sjamie argv[argc++] = cs; 381214797Sjamie if (argc == 0) 382223189Sjamie return 0; 383214117Sjamie if (argc < 3) { 384214783Sjamie jail_warnx(j, "%s: %s: missing information", 385214783Sjamie j->intparams[comparam]->name, comstring->s); 386214117Sjamie failed(j); 387214117Sjamie return -1; 388214117Sjamie } 389214805Sjamie if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 390214805Sjamie down ? argv[2] : NULL) < 0) { 391214805Sjamie failed(j); 392214797Sjamie return -1; 393214805Sjamie } 394214117Sjamie if (down) { 395214117Sjamie argv[4] = NULL; 396214117Sjamie argv[3] = argv[1]; 397214117Sjamie *(const char **)&argv[0] = "/sbin/umount"; 398214117Sjamie } else { 399214117Sjamie if (argc == 4) { 400214117Sjamie argv[7] = NULL; 401214117Sjamie argv[6] = argv[1]; 402214117Sjamie argv[5] = argv[0]; 403214117Sjamie argv[4] = argv[3]; 404214117Sjamie *(const char **)&argv[3] = "-o"; 405214117Sjamie } else { 406214117Sjamie argv[5] = NULL; 407214117Sjamie argv[4] = argv[1]; 408214117Sjamie argv[3] = argv[0]; 409214117Sjamie } 410214117Sjamie *(const char **)&argv[0] = _PATH_MOUNT; 411214117Sjamie } 412214117Sjamie *(const char **)&argv[1] = "-t"; 413216367Sjamie break; 414216367Sjamie 415216367Sjamie case IP_MOUNT_DEVFS: 416214117Sjamie path = string_param(j->intparams[KP_PATH]); 417214117Sjamie if (path == NULL) { 418214117Sjamie jail_warnx(j, "mount.devfs: no path"); 419214117Sjamie failed(j); 420214117Sjamie return -1; 421214117Sjamie } 422214797Sjamie devpath = alloca(strlen(path) + 5); 423214797Sjamie sprintf(devpath, "%s/dev", path); 424214805Sjamie if (check_path(j, "mount.devfs", devpath, 0, 425214805Sjamie down ? "devfs" : NULL) < 0) { 426214805Sjamie failed(j); 427214797Sjamie return -1; 428214805Sjamie } 429214117Sjamie if (down) { 430214117Sjamie argv = alloca(3 * sizeof(char *)); 431214117Sjamie *(const char **)&argv[0] = "/sbin/umount"; 432214797Sjamie argv[1] = devpath; 433214117Sjamie argv[2] = NULL; 434214117Sjamie } else { 435214117Sjamie argv = alloca(4 * sizeof(char *)); 436214117Sjamie *(const char **)&argv[0] = _PATH_BSHELL; 437214117Sjamie *(const char **)&argv[1] = "-c"; 438214117Sjamie ruleset = string_param(j->intparams 439214117Sjamie [IP_MOUNT_DEVFS_RULESET]); 440214117Sjamie argv[2] = alloca(strlen(path) + 441214117Sjamie (ruleset ? strlen(ruleset) + 1 : 0) + 56); 442214117Sjamie sprintf(argv[2], ". /etc/rc.subr; load_rc_config .; " 443214117Sjamie "devfs_mount_jail %s/dev%s%s", path, 444214117Sjamie ruleset ? " " : "", ruleset ? ruleset : ""); 445214117Sjamie argv[3] = NULL; 446214117Sjamie } 447216367Sjamie break; 448216367Sjamie 449216367Sjamie case IP_COMMAND: 450216367Sjamie if (j->name != NULL) 451216367Sjamie goto default_command; 452214117Sjamie argc = 0; 453223188Sjamie TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 454214117Sjamie argc++; 455214117Sjamie argv = alloca((argc + 1) * sizeof(char *)); 456214117Sjamie argc = 0; 457223188Sjamie TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 458214117Sjamie argv[argc++] = s->s; 459214117Sjamie argv[argc] = NULL; 460223368Sjamie j->comstring = &dummystring; 461216367Sjamie break; 462216367Sjamie 463216367Sjamie default: 464216367Sjamie default_command: 465216367Sjamie if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 466216367Sjamie !(cs[0] == '&' && cs[1] == '\0')) { 467216367Sjamie argv = alloca(4 * sizeof(char *)); 468216367Sjamie *(const char **)&argv[0] = _PATH_BSHELL; 469216367Sjamie *(const char **)&argv[1] = "-c"; 470216367Sjamie argv[2] = comstring->s; 471216367Sjamie argv[3] = NULL; 472216367Sjamie } else { 473216367Sjamie if (cs) { 474216367Sjamie *cs = 0; 475216367Sjamie bg = 1; 476216367Sjamie } 477216367Sjamie comcs = alloca(comstring->len + 1); 478216367Sjamie strcpy(comcs, comstring->s); 479216367Sjamie argc = 0; 480216367Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 481216367Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 482216367Sjamie argc++; 483216367Sjamie argv = alloca((argc + 1) * sizeof(char *)); 484216367Sjamie strcpy(comcs, comstring->s); 485216367Sjamie argc = 0; 486216367Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 487216367Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 488216367Sjamie argv[argc++] = cs; 489216367Sjamie argv[argc] = NULL; 490214117Sjamie } 491214117Sjamie } 492223189Sjamie if (argv[0] == NULL) 493223189Sjamie return 0; 494216367Sjamie 495214117Sjamie if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 496214117Sjamie timeout != 0) { 497214117Sjamie clock_gettime(CLOCK_REALTIME, &j->timeout); 498214117Sjamie j->timeout.tv_sec += timeout; 499214117Sjamie } else 500214117Sjamie j->timeout.tv_sec = 0; 501214117Sjamie 502214117Sjamie injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 503214117Sjamie comparam == IP_EXEC_STOP; 504214117Sjamie clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 505214117Sjamie username = string_param(j->intparams[injail 506214117Sjamie ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 507214117Sjamie sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 508214117Sjamie 509214117Sjamie consfd = 0; 510214117Sjamie if (injail && 511214117Sjamie (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 512214805Sjamie if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) { 513214805Sjamie failed(j); 514214797Sjamie return -1; 515214805Sjamie } 516214117Sjamie consfd = 517214117Sjamie open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 518214117Sjamie if (consfd < 0) { 519214117Sjamie jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 520214117Sjamie failed(j); 521214117Sjamie return -1; 522214117Sjamie } 523214117Sjamie } 524214117Sjamie 525214117Sjamie comlen = 0; 526214117Sjamie for (i = 0; argv[i]; i++) 527214117Sjamie comlen += strlen(argv[i]) + 1; 528214117Sjamie j->comline = cs = emalloc(comlen); 529214117Sjamie for (i = 0; argv[i]; i++) { 530214117Sjamie strcpy(cs, argv[i]); 531214117Sjamie if (argv[i + 1]) { 532214117Sjamie cs += strlen(argv[i]) + 1; 533214117Sjamie cs[-1] = ' '; 534214117Sjamie } 535214117Sjamie } 536214117Sjamie if (verbose > 0) 537214117Sjamie jail_note(j, "run command%s%s%s: %s\n", 538214117Sjamie injail ? " in jail" : "", username ? " as " : "", 539214117Sjamie username ? username : "", j->comline); 540214117Sjamie 541214117Sjamie pid = fork(); 542214117Sjamie if (pid < 0) 543214117Sjamie err(1, "fork"); 544214117Sjamie if (pid > 0) { 545214117Sjamie if (bg) { 546216367Sjamie free(j->comline); 547216367Sjamie j->comline = NULL; 548214117Sjamie requeue(j, &ready); 549214117Sjamie } else { 550216367Sjamie paralimit--; 551214117Sjamie add_proc(j, pid); 552214117Sjamie } 553214117Sjamie return 1; 554214117Sjamie } 555214117Sjamie if (bg) 556214117Sjamie setsid(); 557214117Sjamie 558223189Sjamie /* Set up the environment and run the command */ 559214117Sjamie pwd = NULL; 560214117Sjamie lcap = NULL; 561214117Sjamie if ((clean || username) && injail && sjuser && 562214117Sjamie get_user_info(j, username, &pwd, &lcap) < 0) 563214117Sjamie exit(1); 564214117Sjamie if (injail) { 565214117Sjamie /* jail_attach won't chdir along with its chroot. */ 566214117Sjamie path = string_param(j->intparams[KP_PATH]); 567214117Sjamie if (path && chdir(path) < 0) { 568214117Sjamie jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 569214117Sjamie exit(1); 570214117Sjamie } 571214117Sjamie if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 572214117Sjamie setfib(fib) < 0) { 573214117Sjamie jail_warnx(j, "setfib: %s", strerror(errno)); 574214117Sjamie exit(1); 575214117Sjamie } 576214117Sjamie if (jail_attach(j->jid) < 0) { 577214117Sjamie jail_warnx(j, "jail_attach: %s", strerror(errno)); 578214117Sjamie exit(1); 579214117Sjamie } 580214117Sjamie } 581214117Sjamie if (clean || username) { 582214117Sjamie if (!(injail && sjuser) && 583214117Sjamie get_user_info(j, username, &pwd, &lcap) < 0) 584214117Sjamie exit(1); 585214117Sjamie if (clean) { 586214117Sjamie term = getenv("TERM"); 587214117Sjamie environ = &cleanenv; 588214117Sjamie setenv("PATH", "/bin:/usr/bin", 0); 589214117Sjamie setenv("TERM", term, 1); 590214117Sjamie } 591214117Sjamie if (setusercontext(lcap, pwd, pwd->pw_uid, username 592214117Sjamie ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 593214117Sjamie : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 594214117Sjamie jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 595214117Sjamie strerror(errno)); 596214117Sjamie exit(1); 597214117Sjamie } 598214117Sjamie login_close(lcap); 599214117Sjamie setenv("USER", pwd->pw_name, 1); 600214117Sjamie setenv("HOME", pwd->pw_dir, 1); 601214117Sjamie setenv("SHELL", 602214117Sjamie *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 603214117Sjamie if (clean && chdir(pwd->pw_dir) < 0) { 604214117Sjamie jail_warnx(j, "chdir %s: %s", 605214117Sjamie pwd->pw_dir, strerror(errno)); 606214117Sjamie exit(1); 607214117Sjamie } 608214117Sjamie endpwent(); 609214117Sjamie } 610214117Sjamie 611214117Sjamie if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 612214117Sjamie jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 613214117Sjamie exit(1); 614214117Sjamie } 615214117Sjamie closefrom(3); 616214117Sjamie execvp(argv[0], argv); 617214117Sjamie jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 618214117Sjamie exit(1); 619214117Sjamie} 620214117Sjamie 621214117Sjamie/* 622214117Sjamie * Add a process to the hash, tied to a jail. 623214117Sjamie */ 624214117Sjamiestatic void 625214117Sjamieadd_proc(struct cfjail *j, pid_t pid) 626214117Sjamie{ 627214117Sjamie struct kevent ke; 628214117Sjamie struct cfjail *tj; 629214117Sjamie struct phash *ph; 630214117Sjamie 631214117Sjamie if (!kq && (kq = kqueue()) < 0) 632214117Sjamie err(1, "kqueue"); 633214117Sjamie EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 634214117Sjamie if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) 635214117Sjamie err(1, "kevent"); 636214117Sjamie ph = emalloc(sizeof(struct phash)); 637214117Sjamie ph->j = j; 638214117Sjamie ph->pid = pid; 639214117Sjamie LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 640214117Sjamie j->nprocs++; 641216367Sjamie j->flags |= JF_SLEEPQ; 642216367Sjamie if (j->timeout.tv_sec == 0) 643216367Sjamie requeue(j, &sleeping); 644216367Sjamie else { 645216367Sjamie /* File the jail in the sleep queue acording to its timeout. */ 646214117Sjamie TAILQ_REMOVE(j->queue, j, tq); 647214117Sjamie TAILQ_FOREACH(tj, &sleeping, tq) { 648214117Sjamie if (!tj->timeout.tv_sec || 649214117Sjamie j->timeout.tv_sec < tj->timeout.tv_sec || 650214117Sjamie (j->timeout.tv_sec == tj->timeout.tv_sec && 651214117Sjamie j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 652214117Sjamie TAILQ_INSERT_BEFORE(tj, j, tq); 653214117Sjamie break; 654214117Sjamie } 655214117Sjamie } 656214117Sjamie if (tj == NULL) 657214117Sjamie TAILQ_INSERT_TAIL(&sleeping, j, tq); 658214117Sjamie j->queue = &sleeping; 659216367Sjamie } 660214117Sjamie} 661214117Sjamie 662214117Sjamie/* 663214117Sjamie * Remove any processes from the hash that correspond to a jail. 664214117Sjamie */ 665214117Sjamiestatic void 666214117Sjamieclear_procs(struct cfjail *j) 667214117Sjamie{ 668214117Sjamie struct kevent ke; 669214117Sjamie struct phash *ph, *tph; 670214117Sjamie int i; 671214117Sjamie 672214117Sjamie j->nprocs = 0; 673214117Sjamie for (i = 0; i < PHASH_SIZE; i++) 674214117Sjamie LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 675214117Sjamie if (ph->j == j) { 676214117Sjamie EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 677214117Sjamie NOTE_EXIT, 0, NULL); 678214117Sjamie (void)kevent(kq, &ke, 1, NULL, 0, NULL); 679214117Sjamie LIST_REMOVE(ph, le); 680214117Sjamie free(ph); 681214117Sjamie } 682214117Sjamie} 683214117Sjamie 684214117Sjamie/* 685214117Sjamie * Find the jail that corresponds to an exited process. 686214117Sjamie */ 687214117Sjamiestatic struct cfjail * 688214117Sjamiefind_proc(pid_t pid) 689214117Sjamie{ 690214117Sjamie struct cfjail *j; 691214117Sjamie struct phash *ph; 692214117Sjamie 693214117Sjamie LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 694214117Sjamie if (ph->pid == pid) { 695214117Sjamie j = ph->j; 696214117Sjamie LIST_REMOVE(ph, le); 697214117Sjamie free(ph); 698214117Sjamie return --j->nprocs ? NULL : j; 699214117Sjamie } 700214117Sjamie return NULL; 701214117Sjamie} 702214117Sjamie 703214117Sjamie/* 704216367Sjamie * Send SIGTERM to all processes in a jail and wait for them to die. 705216367Sjamie */ 706216367Sjamiestatic int 707216367Sjamieterm_procs(struct cfjail *j) 708216367Sjamie{ 709216367Sjamie struct kinfo_proc *ki; 710216367Sjamie int i, noted, pcnt, timeout; 711216367Sjamie 712216367Sjamie static kvm_t *kd; 713216367Sjamie 714216367Sjamie if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 715216367Sjamie timeout = DEFAULT_STOP_TIMEOUT; 716216367Sjamie else if (timeout == 0) 717216367Sjamie return 0; 718216367Sjamie 719216367Sjamie if (kd == NULL) { 720216367Sjamie kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "jail"); 721216367Sjamie if (kd == NULL) 722216367Sjamie exit(1); 723216367Sjamie } 724216367Sjamie 725216367Sjamie ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 726216367Sjamie if (ki == NULL) 727216367Sjamie exit(1); 728216367Sjamie noted = 0; 729216367Sjamie for (i = 0; i < pcnt; i++) 730216367Sjamie if (ki[i].ki_jid == j->jid && 731216367Sjamie kill(ki[i].ki_pid, SIGTERM) == 0) { 732216367Sjamie add_proc(j, ki[i].ki_pid); 733216367Sjamie if (verbose > 0) { 734216367Sjamie if (!noted) { 735216367Sjamie noted = 1; 736216367Sjamie jail_note(j, "sent SIGTERM to:"); 737216367Sjamie } 738216367Sjamie printf(" %d", ki[i].ki_pid); 739216367Sjamie } 740216367Sjamie } 741216367Sjamie if (noted) 742216367Sjamie printf("\n"); 743216367Sjamie if (j->nprocs > 0) { 744216367Sjamie clock_gettime(CLOCK_REALTIME, &j->timeout); 745216367Sjamie j->timeout.tv_sec += timeout; 746216367Sjamie return 1; 747216367Sjamie } 748216367Sjamie return 0; 749216367Sjamie} 750216367Sjamie 751216367Sjamie/* 752214117Sjamie * Look up a user in the passwd and login.conf files. 753214117Sjamie */ 754214117Sjamiestatic int 755214117Sjamieget_user_info(struct cfjail *j, const char *username, 756214117Sjamie const struct passwd **pwdp, login_cap_t **lcapp) 757214117Sjamie{ 758214117Sjamie const struct passwd *pwd; 759214117Sjamie 760214117Sjamie *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 761214117Sjamie if (pwd == NULL) { 762214117Sjamie if (errno) 763214117Sjamie jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 764214117Sjamie username ? username : "", strerror(errno)); 765214117Sjamie else if (username) 766214117Sjamie jail_warnx(j, "%s: no such user", username); 767214117Sjamie else 768214117Sjamie jail_warnx(j, "unknown uid %d", getuid()); 769214117Sjamie return -1; 770214117Sjamie } 771214117Sjamie *lcapp = login_getpwclass(pwd); 772214117Sjamie if (*lcapp == NULL) { 773214117Sjamie jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 774214117Sjamie strerror(errno)); 775214117Sjamie return -1; 776214117Sjamie } 777214117Sjamie /* Set the groups while the group file is still available */ 778214117Sjamie if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 779214117Sjamie jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 780214117Sjamie strerror(errno)); 781214117Sjamie return -1; 782214117Sjamie } 783214117Sjamie return 0; 784214117Sjamie} 785214797Sjamie 786214797Sjamie/* 787214797Sjamie * Make sure a mount or consolelog path is a valid absolute pathname 788214797Sjamie * with no symlinks. 789214797Sjamie */ 790214797Sjamiestatic int 791214805Sjamiecheck_path(struct cfjail *j, const char *pname, const char *path, int isfile, 792214805Sjamie const char *umount_type) 793214797Sjamie{ 794214805Sjamie struct stat st, mpst; 795214805Sjamie struct statfs stfs; 796214797Sjamie char *tpath, *p; 797214797Sjamie const char *jailpath; 798214797Sjamie size_t jplen; 799214797Sjamie 800214797Sjamie if (path[0] != '/') { 801214797Sjamie jail_warnx(j, "%s: %s: not an absolute pathname", 802214797Sjamie pname, path); 803214797Sjamie return -1; 804214797Sjamie } 805214797Sjamie /* 806214797Sjamie * Only check for symlinks in components below the jail's path, 807214797Sjamie * since that's where the security risk lies. 808214797Sjamie */ 809214797Sjamie jailpath = string_param(j->intparams[KP_PATH]); 810214797Sjamie if (jailpath == NULL) 811214797Sjamie jailpath = ""; 812214797Sjamie jplen = strlen(jailpath); 813214805Sjamie if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 814214805Sjamie tpath = alloca(strlen(path) + 1); 815214805Sjamie strcpy(tpath, path); 816214805Sjamie for (p = tpath + jplen; p != NULL; ) { 817214805Sjamie p = strchr(p + 1, '/'); 818214805Sjamie if (p) 819214805Sjamie *p = '\0'; 820214805Sjamie if (lstat(tpath, &st) < 0) { 821214805Sjamie if (errno == ENOENT && isfile && !p) 822214805Sjamie break; 823214805Sjamie jail_warnx(j, "%s: %s: %s", pname, tpath, 824214805Sjamie strerror(errno)); 825214805Sjamie return -1; 826214805Sjamie } 827214805Sjamie if (S_ISLNK(st.st_mode)) { 828214805Sjamie jail_warnx(j, "%s: %s is a symbolic link", 829214805Sjamie pname, tpath); 830214805Sjamie return -1; 831214805Sjamie } 832214805Sjamie if (p) 833214805Sjamie *p = '/'; 834214805Sjamie } 835214805Sjamie } 836214805Sjamie if (umount_type != NULL) { 837214805Sjamie if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 838214805Sjamie jail_warnx(j, "%s: %s: %s", pname, path, 839214797Sjamie strerror(errno)); 840214797Sjamie return -1; 841214797Sjamie } 842214805Sjamie if (stat(stfs.f_mntonname, &mpst) < 0) { 843214805Sjamie jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 844214805Sjamie strerror(errno)); 845214797Sjamie return -1; 846214797Sjamie } 847214805Sjamie if (st.st_ino != mpst.st_ino) { 848214805Sjamie jail_warnx(j, "%s: %s: not a mount point", 849214805Sjamie pname, path); 850214805Sjamie return -1; 851214805Sjamie } 852214805Sjamie if (strcmp(stfs.f_fstypename, umount_type)) { 853214805Sjamie jail_warnx(j, "%s: %s: not a %s mount", 854214805Sjamie pname, path, umount_type); 855214805Sjamie return -1; 856214805Sjamie } 857214797Sjamie } 858214797Sjamie return 0; 859214797Sjamie} 860