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("$FreeBSD$"); 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); 69246804Sjamiestatic int 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; 91248854Sjamie int create_failed, stopping; 92223189Sjamie 93223442Sjamie if (paralimit == 0) { 94223442Sjamie requeue(j, &runnable); 95223442Sjamie return 1; 96223442Sjamie } 97223189Sjamie create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED; 98248854Sjamie stopping = (j->flags & JF_STOP) != 0; 99223442Sjamie comparam = *j->comparam; 100223442Sjamie for (;;) { 101223189Sjamie if (j->comstring == NULL) { 102223442Sjamie j->comparam += create_failed ? -1 : 1; 103223442Sjamie switch ((comparam = *j->comparam)) { 104234988Sjamie case IP__NULL: 105223442Sjamie return 0; 106223189Sjamie case IP_MOUNT_DEVFS: 107223189Sjamie if (!bool_param(j->intparams[IP_MOUNT_DEVFS])) 108223189Sjamie continue; 109256387Shrs j->comstring = &dummystring; 110256387Shrs break; 111256387Shrs case IP_MOUNT_FDESCFS: 112256387Shrs if (!bool_param(j->intparams[IP_MOUNT_FDESCFS])) 113256387Shrs continue; 114256387Shrs j->comstring = &dummystring; 115223263Sjamie case IP__OP: 116223189Sjamie case IP_STOP_TIMEOUT: 117223189Sjamie j->comstring = &dummystring; 118223189Sjamie break; 119223189Sjamie default: 120223189Sjamie if (j->intparams[comparam] == NULL) 121223189Sjamie continue; 122248854Sjamie j->comstring = create_failed || (stopping && 123248854Sjamie (j->intparams[comparam]->flags & PF_REV)) 124223189Sjamie ? TAILQ_LAST(&j->intparams[comparam]->val, 125223189Sjamie cfstrings) 126223189Sjamie : TAILQ_FIRST(&j->intparams[comparam]->val); 127223189Sjamie } 128223442Sjamie } else { 129223442Sjamie j->comstring = j->comstring == &dummystring ? NULL : 130248854Sjamie create_failed || (stopping && 131248854Sjamie (j->intparams[comparam]->flags & PF_REV)) 132223442Sjamie ? TAILQ_PREV(j->comstring, cfstrings, tq) 133223442Sjamie : TAILQ_NEXT(j->comstring, tq); 134223189Sjamie } 135223442Sjamie if (j->comstring == NULL || j->comstring->len == 0 || 136223442Sjamie (create_failed && (comparam == IP_EXEC_PRESTART || 137223442Sjamie comparam == IP_EXEC_START || comparam == IP_COMMAND || 138223442Sjamie comparam == IP_EXEC_POSTSTART))) 139223442Sjamie continue; 140223442Sjamie switch (run_command(j)) { 141223442Sjamie case -1: 142223442Sjamie failed(j); 143223442Sjamie /* FALLTHROUGH */ 144223442Sjamie case 1: 145223442Sjamie return 1; 146223189Sjamie } 147223189Sjamie } 148223189Sjamie} 149223189Sjamie 150223189Sjamie/* 151223189Sjamie * Check command exit status 152223189Sjamie */ 153223189Sjamieint 154223189Sjamiefinish_command(struct cfjail *j) 155223189Sjamie{ 156223189Sjamie int error; 157223189Sjamie 158223189Sjamie if (!(j->flags & JF_SLEEPQ)) 159223189Sjamie return 0; 160223189Sjamie j->flags &= ~JF_SLEEPQ; 161223827Sjamie if (*j->comparam == IP_STOP_TIMEOUT) 162223827Sjamie { 163223827Sjamie j->flags &= ~JF_TIMEOUT; 164223827Sjamie j->pstatus = 0; 165223827Sjamie return 0; 166223189Sjamie } 167223827Sjamie paralimit++; 168223827Sjamie if (!TAILQ_EMPTY(&runnable)) 169223827Sjamie requeue(TAILQ_FIRST(&runnable), &ready); 170223189Sjamie error = 0; 171223189Sjamie if (j->flags & JF_TIMEOUT) { 172223189Sjamie j->flags &= ~JF_TIMEOUT; 173223189Sjamie if (*j->comparam != IP_STOP_TIMEOUT) { 174223189Sjamie jail_warnx(j, "%s: timed out", j->comline); 175223189Sjamie failed(j); 176223189Sjamie error = -1; 177223189Sjamie } else if (verbose > 0) 178223189Sjamie jail_note(j, "timed out\n"); 179223189Sjamie } else if (j->pstatus != 0) { 180223189Sjamie if (WIFSIGNALED(j->pstatus)) 181223189Sjamie jail_warnx(j, "%s: exited on signal %d", 182223189Sjamie j->comline, WTERMSIG(j->pstatus)); 183223189Sjamie else 184223189Sjamie jail_warnx(j, "%s: failed", j->comline); 185223189Sjamie j->pstatus = 0; 186223189Sjamie failed(j); 187223189Sjamie error = -1; 188223189Sjamie } 189223189Sjamie free(j->comline); 190223189Sjamie j->comline = NULL; 191223189Sjamie return error; 192223189Sjamie} 193223189Sjamie 194223189Sjamie/* 195223442Sjamie * Check for finished processes or timeouts. 196223189Sjamie */ 197223189Sjamiestruct cfjail * 198223189Sjamienext_proc(int nonblock) 199223189Sjamie{ 200223189Sjamie struct kevent ke; 201223189Sjamie struct timespec ts; 202223189Sjamie struct timespec *tsp; 203223189Sjamie struct cfjail *j; 204223189Sjamie 205223189Sjamie if (!TAILQ_EMPTY(&sleeping)) { 206223189Sjamie again: 207223189Sjamie tsp = NULL; 208223189Sjamie if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) { 209223189Sjamie clock_gettime(CLOCK_REALTIME, &ts); 210223189Sjamie ts.tv_sec = j->timeout.tv_sec - ts.tv_sec; 211223189Sjamie ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec; 212223189Sjamie if (ts.tv_nsec < 0) { 213223189Sjamie ts.tv_sec--; 214223189Sjamie ts.tv_nsec += 1000000000; 215223189Sjamie } 216223189Sjamie if (ts.tv_sec < 0 || 217223189Sjamie (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 218223189Sjamie j->flags |= JF_TIMEOUT; 219223189Sjamie clear_procs(j); 220223189Sjamie return j; 221223189Sjamie } 222223189Sjamie tsp = &ts; 223223189Sjamie } 224223189Sjamie if (nonblock) { 225223189Sjamie ts.tv_sec = 0; 226223189Sjamie ts.tv_nsec = 0; 227223189Sjamie tsp = &ts; 228223189Sjamie } 229223189Sjamie switch (kevent(kq, NULL, 0, &ke, 1, tsp)) { 230223189Sjamie case -1: 231223189Sjamie if (errno != EINTR) 232223189Sjamie err(1, "kevent"); 233223189Sjamie goto again; 234223189Sjamie case 0: 235223189Sjamie if (!nonblock) { 236223189Sjamie j = TAILQ_FIRST(&sleeping); 237223189Sjamie j->flags |= JF_TIMEOUT; 238223189Sjamie clear_procs(j); 239223189Sjamie return j; 240223189Sjamie } 241223189Sjamie break; 242223189Sjamie case 1: 243223189Sjamie (void)waitpid(ke.ident, NULL, WNOHANG); 244223189Sjamie if ((j = find_proc(ke.ident))) { 245223189Sjamie j->pstatus = ke.data; 246223189Sjamie return j; 247223189Sjamie } 248223189Sjamie goto again; 249223189Sjamie } 250223189Sjamie } 251223189Sjamie return NULL; 252223189Sjamie} 253223189Sjamie 254223189Sjamie/* 255223189Sjamie * Run a single command for a jail, possible inside the jail. 256223189Sjamie */ 257236198Sjamiestatic int 258223189Sjamierun_command(struct cfjail *j) 259223189Sjamie{ 260214117Sjamie const struct passwd *pwd; 261223189Sjamie const struct cfstring *comstring, *s; 262214117Sjamie login_cap_t *lcap; 263214117Sjamie char **argv; 264223351Sjamie char *cs, *comcs, *devpath; 265214117Sjamie const char *jidstr, *conslog, *path, *ruleset, *term, *username; 266223189Sjamie enum intparam comparam; 267214117Sjamie size_t comlen; 268214117Sjamie pid_t pid; 269214117Sjamie int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout; 270223351Sjamie#if defined(INET) || defined(INET6) 271223351Sjamie char *addr; 272223351Sjamie#endif 273214117Sjamie 274214117Sjamie static char *cleanenv; 275214117Sjamie 276223263Sjamie /* Perform some operations that aren't actually commands */ 277223263Sjamie comparam = *j->comparam; 278223263Sjamie down = j->flags & (JF_STOP | JF_FAILED); 279223263Sjamie switch (comparam) { 280223263Sjamie case IP_STOP_TIMEOUT: 281223263Sjamie return term_procs(j); 282223263Sjamie 283223263Sjamie case IP__OP: 284223263Sjamie if (down) { 285231238Sjamie if (jail_remove(j->jid) < 0 && errno == EPERM) { 286231238Sjamie jail_warnx(j, "jail_remove: %s", 287231238Sjamie strerror(errno)); 288231238Sjamie return -1; 289231238Sjamie } 290223827Sjamie if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP 291223263Sjamie ? note_remove : j->name != NULL))) 292223263Sjamie jail_note(j, "removed\n"); 293223263Sjamie j->jid = -1; 294223263Sjamie if (j->flags & JF_STOP) 295223263Sjamie dep_done(j, DF_LIGHT); 296223263Sjamie else 297223263Sjamie j->flags &= ~JF_PERSIST; 298223263Sjamie } else { 299223442Sjamie if (create_jail(j) < 0) 300223263Sjamie return -1; 301236198Sjamie if (iflag) 302236198Sjamie printf("%d\n", j->jid); 303223263Sjamie if (verbose >= 0 && (j->name || verbose > 0)) 304223263Sjamie jail_note(j, "created\n"); 305223263Sjamie dep_done(j, DF_LIGHT); 306223263Sjamie } 307223442Sjamie return 0; 308223327Sjamie 309223327Sjamie default: ; 310223263Sjamie } 311214117Sjamie /* 312214117Sjamie * Collect exec arguments. Internal commands for network and 313216367Sjamie * mounting build their own argument lists. 314214117Sjamie */ 315223189Sjamie comstring = j->comstring; 316223189Sjamie bg = 0; 317216367Sjamie switch (comparam) { 318223351Sjamie#ifdef INET 319216367Sjamie case IP__IP4_IFADDR: 320214117Sjamie argv = alloca(8 * sizeof(char *)); 321214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 322214117Sjamie if ((cs = strchr(comstring->s, '|'))) { 323214117Sjamie argv[1] = alloca(cs - comstring->s + 1); 324214117Sjamie strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 325214117Sjamie addr = cs + 1; 326214117Sjamie } else { 327214117Sjamie *(const char **)&argv[1] = 328214117Sjamie string_param(j->intparams[IP_INTERFACE]); 329214117Sjamie addr = comstring->s; 330214117Sjamie } 331214117Sjamie *(const char **)&argv[2] = "inet"; 332214117Sjamie if (!(cs = strchr(addr, '/'))) { 333214117Sjamie argv[3] = addr; 334214117Sjamie *(const char **)&argv[4] = "netmask"; 335214117Sjamie *(const char **)&argv[5] = "255.255.255.255"; 336214117Sjamie argc = 6; 337214117Sjamie } else if (strchr(cs + 1, '.')) { 338214117Sjamie argv[3] = alloca(cs - addr + 1); 339214117Sjamie strlcpy(argv[3], addr, cs - addr + 1); 340214117Sjamie *(const char **)&argv[4] = "netmask"; 341214117Sjamie *(const char **)&argv[5] = cs + 1; 342214117Sjamie argc = 6; 343214117Sjamie } else { 344214117Sjamie argv[3] = addr; 345214117Sjamie argc = 4; 346214117Sjamie } 347214117Sjamie *(const char **)&argv[argc] = down ? "-alias" : "alias"; 348214117Sjamie argv[argc + 1] = NULL; 349216367Sjamie break; 350223351Sjamie#endif 351216367Sjamie 352214117Sjamie#ifdef INET6 353216367Sjamie case IP__IP6_IFADDR: 354214117Sjamie argv = alloca(8 * sizeof(char *)); 355214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 356214117Sjamie if ((cs = strchr(comstring->s, '|'))) { 357214117Sjamie argv[1] = alloca(cs - comstring->s + 1); 358214117Sjamie strlcpy(argv[1], comstring->s, cs - comstring->s + 1); 359214117Sjamie addr = cs + 1; 360214117Sjamie } else { 361214117Sjamie *(const char **)&argv[1] = 362214117Sjamie string_param(j->intparams[IP_INTERFACE]); 363214117Sjamie addr = comstring->s; 364214117Sjamie } 365214117Sjamie *(const char **)&argv[2] = "inet6"; 366214117Sjamie argv[3] = addr; 367214117Sjamie if (!(cs = strchr(addr, '/'))) { 368214117Sjamie *(const char **)&argv[4] = "prefixlen"; 369214117Sjamie *(const char **)&argv[5] = "128"; 370214117Sjamie argc = 6; 371214117Sjamie } else 372214117Sjamie argc = 4; 373214117Sjamie *(const char **)&argv[argc] = down ? "-alias" : "alias"; 374214117Sjamie argv[argc + 1] = NULL; 375216367Sjamie break; 376214117Sjamie#endif 377216367Sjamie 378216367Sjamie case IP_VNET_INTERFACE: 379214117Sjamie argv = alloca(5 * sizeof(char *)); 380214117Sjamie *(const char **)&argv[0] = _PATH_IFCONFIG; 381214117Sjamie argv[1] = comstring->s; 382214117Sjamie *(const char **)&argv[2] = down ? "-vnet" : "vnet"; 383214117Sjamie jidstr = string_param(j->intparams[KP_JID]); 384214117Sjamie *(const char **)&argv[3] = 385214117Sjamie jidstr ? jidstr : string_param(j->intparams[KP_NAME]); 386214117Sjamie argv[4] = NULL; 387216367Sjamie break; 388216367Sjamie 389216367Sjamie case IP_MOUNT: 390216367Sjamie case IP__MOUNT_FROM_FSTAB: 391214117Sjamie argv = alloca(8 * sizeof(char *)); 392214117Sjamie comcs = alloca(comstring->len + 1); 393214117Sjamie strcpy(comcs, comstring->s); 394214117Sjamie argc = 0; 395214117Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4; 396214117Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 397214117Sjamie argv[argc++] = cs; 398214797Sjamie if (argc == 0) 399223189Sjamie return 0; 400214117Sjamie if (argc < 3) { 401214783Sjamie jail_warnx(j, "%s: %s: missing information", 402214783Sjamie j->intparams[comparam]->name, comstring->s); 403214117Sjamie return -1; 404214117Sjamie } 405214805Sjamie if (check_path(j, j->intparams[comparam]->name, argv[1], 0, 406223442Sjamie down ? argv[2] : NULL) < 0) 407214797Sjamie return -1; 408214117Sjamie if (down) { 409214117Sjamie argv[4] = NULL; 410214117Sjamie argv[3] = argv[1]; 411214117Sjamie *(const char **)&argv[0] = "/sbin/umount"; 412214117Sjamie } else { 413214117Sjamie if (argc == 4) { 414214117Sjamie argv[7] = NULL; 415214117Sjamie argv[6] = argv[1]; 416214117Sjamie argv[5] = argv[0]; 417214117Sjamie argv[4] = argv[3]; 418214117Sjamie *(const char **)&argv[3] = "-o"; 419214117Sjamie } else { 420214117Sjamie argv[5] = NULL; 421214117Sjamie argv[4] = argv[1]; 422214117Sjamie argv[3] = argv[0]; 423214117Sjamie } 424214117Sjamie *(const char **)&argv[0] = _PATH_MOUNT; 425214117Sjamie } 426214117Sjamie *(const char **)&argv[1] = "-t"; 427216367Sjamie break; 428216367Sjamie 429216367Sjamie case IP_MOUNT_DEVFS: 430232242Sjamie argv = alloca(7 * sizeof(char *)); 431214117Sjamie path = string_param(j->intparams[KP_PATH]); 432214117Sjamie if (path == NULL) { 433214117Sjamie jail_warnx(j, "mount.devfs: no path"); 434214117Sjamie return -1; 435214117Sjamie } 436214797Sjamie devpath = alloca(strlen(path) + 5); 437214797Sjamie sprintf(devpath, "%s/dev", path); 438214805Sjamie if (check_path(j, "mount.devfs", devpath, 0, 439223442Sjamie down ? "devfs" : NULL) < 0) 440214797Sjamie return -1; 441214117Sjamie if (down) { 442214117Sjamie *(const char **)&argv[0] = "/sbin/umount"; 443214797Sjamie argv[1] = devpath; 444214117Sjamie argv[2] = NULL; 445214117Sjamie } else { 446232242Sjamie *(const char **)&argv[0] = _PATH_MOUNT; 447232242Sjamie *(const char **)&argv[1] = "-t"; 448232242Sjamie *(const char **)&argv[2] = "devfs"; 449232242Sjamie ruleset = string_param(j->intparams[KP_DEVFS_RULESET]); 450232242Sjamie if (!ruleset) 451232242Sjamie ruleset = "4"; /* devfsrules_jail */ 452232242Sjamie argv[3] = alloca(11 + strlen(ruleset)); 453232242Sjamie sprintf(argv[3], "-oruleset=%s", ruleset); 454232242Sjamie *(const char **)&argv[4] = "."; 455232242Sjamie argv[5] = devpath; 456232242Sjamie argv[6] = NULL; 457214117Sjamie } 458216367Sjamie break; 459216367Sjamie 460256387Shrs case IP_MOUNT_FDESCFS: 461256387Shrs argv = alloca(7 * sizeof(char *)); 462256387Shrs path = string_param(j->intparams[KP_PATH]); 463256387Shrs if (path == NULL) { 464256387Shrs jail_warnx(j, "mount.fdescfs: no path"); 465256387Shrs return -1; 466256387Shrs } 467256387Shrs devpath = alloca(strlen(path) + 8); 468256387Shrs sprintf(devpath, "%s/dev/fd", path); 469256387Shrs if (check_path(j, "mount.fdescfs", devpath, 0, 470256387Shrs down ? "fdescfs" : NULL) < 0) 471256387Shrs return -1; 472256387Shrs if (down) { 473256387Shrs *(const char **)&argv[0] = "/sbin/umount"; 474256387Shrs argv[1] = devpath; 475256387Shrs argv[2] = NULL; 476256387Shrs } else { 477256387Shrs *(const char **)&argv[0] = _PATH_MOUNT; 478256387Shrs *(const char **)&argv[1] = "-t"; 479256387Shrs *(const char **)&argv[2] = "fdescfs"; 480256387Shrs *(const char **)&argv[3] = "."; 481256387Shrs argv[4] = devpath; 482256387Shrs argv[5] = NULL; 483256387Shrs } 484256387Shrs break; 485256387Shrs 486216367Sjamie case IP_COMMAND: 487216367Sjamie if (j->name != NULL) 488216367Sjamie goto default_command; 489214117Sjamie argc = 0; 490223188Sjamie TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 491214117Sjamie argc++; 492214117Sjamie argv = alloca((argc + 1) * sizeof(char *)); 493214117Sjamie argc = 0; 494223188Sjamie TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq) 495214117Sjamie argv[argc++] = s->s; 496214117Sjamie argv[argc] = NULL; 497223368Sjamie j->comstring = &dummystring; 498216367Sjamie break; 499216367Sjamie 500216367Sjamie default: 501216367Sjamie default_command: 502216367Sjamie if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) && 503216367Sjamie !(cs[0] == '&' && cs[1] == '\0')) { 504216367Sjamie argv = alloca(4 * sizeof(char *)); 505216367Sjamie *(const char **)&argv[0] = _PATH_BSHELL; 506216367Sjamie *(const char **)&argv[1] = "-c"; 507216367Sjamie argv[2] = comstring->s; 508216367Sjamie argv[3] = NULL; 509216367Sjamie } else { 510216367Sjamie if (cs) { 511216367Sjamie *cs = 0; 512216367Sjamie bg = 1; 513216367Sjamie } 514216367Sjamie comcs = alloca(comstring->len + 1); 515216367Sjamie strcpy(comcs, comstring->s); 516216367Sjamie argc = 0; 517216367Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 518216367Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 519216367Sjamie argc++; 520216367Sjamie argv = alloca((argc + 1) * sizeof(char *)); 521216367Sjamie strcpy(comcs, comstring->s); 522216367Sjamie argc = 0; 523216367Sjamie for (cs = strtok(comcs, " \t\f\v\r\n"); cs; 524216367Sjamie cs = strtok(NULL, " \t\f\v\r\n")) 525216367Sjamie argv[argc++] = cs; 526216367Sjamie argv[argc] = NULL; 527214117Sjamie } 528214117Sjamie } 529223189Sjamie if (argv[0] == NULL) 530223189Sjamie return 0; 531216367Sjamie 532214117Sjamie if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) && 533214117Sjamie timeout != 0) { 534214117Sjamie clock_gettime(CLOCK_REALTIME, &j->timeout); 535214117Sjamie j->timeout.tv_sec += timeout; 536214117Sjamie } else 537214117Sjamie j->timeout.tv_sec = 0; 538214117Sjamie 539214117Sjamie injail = comparam == IP_EXEC_START || comparam == IP_COMMAND || 540214117Sjamie comparam == IP_EXEC_STOP; 541214117Sjamie clean = bool_param(j->intparams[IP_EXEC_CLEAN]); 542214117Sjamie username = string_param(j->intparams[injail 543214117Sjamie ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]); 544214117Sjamie sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]); 545214117Sjamie 546214117Sjamie consfd = 0; 547214117Sjamie if (injail && 548214117Sjamie (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) { 549223442Sjamie if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0) 550214797Sjamie return -1; 551214117Sjamie consfd = 552214117Sjamie open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE); 553214117Sjamie if (consfd < 0) { 554214117Sjamie jail_warnx(j, "open %s: %s", conslog, strerror(errno)); 555214117Sjamie return -1; 556214117Sjamie } 557214117Sjamie } 558214117Sjamie 559214117Sjamie comlen = 0; 560214117Sjamie for (i = 0; argv[i]; i++) 561214117Sjamie comlen += strlen(argv[i]) + 1; 562214117Sjamie j->comline = cs = emalloc(comlen); 563214117Sjamie for (i = 0; argv[i]; i++) { 564214117Sjamie strcpy(cs, argv[i]); 565214117Sjamie if (argv[i + 1]) { 566214117Sjamie cs += strlen(argv[i]) + 1; 567214117Sjamie cs[-1] = ' '; 568214117Sjamie } 569214117Sjamie } 570214117Sjamie if (verbose > 0) 571214117Sjamie jail_note(j, "run command%s%s%s: %s\n", 572214117Sjamie injail ? " in jail" : "", username ? " as " : "", 573214117Sjamie username ? username : "", j->comline); 574214117Sjamie 575214117Sjamie pid = fork(); 576214117Sjamie if (pid < 0) 577214117Sjamie err(1, "fork"); 578214117Sjamie if (pid > 0) { 579246804Sjamie if (bg || !add_proc(j, pid)) { 580216367Sjamie free(j->comline); 581216367Sjamie j->comline = NULL; 582223442Sjamie return 0; 583214117Sjamie } else { 584216367Sjamie paralimit--; 585223442Sjamie return 1; 586214117Sjamie } 587214117Sjamie } 588214117Sjamie if (bg) 589214117Sjamie setsid(); 590214117Sjamie 591223189Sjamie /* Set up the environment and run the command */ 592214117Sjamie pwd = NULL; 593214117Sjamie lcap = NULL; 594214117Sjamie if ((clean || username) && injail && sjuser && 595214117Sjamie get_user_info(j, username, &pwd, &lcap) < 0) 596214117Sjamie exit(1); 597214117Sjamie if (injail) { 598214117Sjamie /* jail_attach won't chdir along with its chroot. */ 599214117Sjamie path = string_param(j->intparams[KP_PATH]); 600214117Sjamie if (path && chdir(path) < 0) { 601214117Sjamie jail_warnx(j, "chdir %s: %s", path, strerror(errno)); 602214117Sjamie exit(1); 603214117Sjamie } 604214117Sjamie if (int_param(j->intparams[IP_EXEC_FIB], &fib) && 605214117Sjamie setfib(fib) < 0) { 606214117Sjamie jail_warnx(j, "setfib: %s", strerror(errno)); 607214117Sjamie exit(1); 608214117Sjamie } 609214117Sjamie if (jail_attach(j->jid) < 0) { 610214117Sjamie jail_warnx(j, "jail_attach: %s", strerror(errno)); 611214117Sjamie exit(1); 612214117Sjamie } 613214117Sjamie } 614214117Sjamie if (clean || username) { 615214117Sjamie if (!(injail && sjuser) && 616214117Sjamie get_user_info(j, username, &pwd, &lcap) < 0) 617214117Sjamie exit(1); 618214117Sjamie if (clean) { 619214117Sjamie term = getenv("TERM"); 620214117Sjamie environ = &cleanenv; 621214117Sjamie setenv("PATH", "/bin:/usr/bin", 0); 622235949Sjamie if (term != NULL) 623235949Sjamie setenv("TERM", term, 1); 624214117Sjamie } 625214117Sjamie if (setusercontext(lcap, pwd, pwd->pw_uid, username 626214117Sjamie ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN 627214117Sjamie : LOGIN_SETPATH | LOGIN_SETENV) < 0) { 628214117Sjamie jail_warnx(j, "setusercontext %s: %s", pwd->pw_name, 629214117Sjamie strerror(errno)); 630214117Sjamie exit(1); 631214117Sjamie } 632214117Sjamie login_close(lcap); 633214117Sjamie setenv("USER", pwd->pw_name, 1); 634214117Sjamie setenv("HOME", pwd->pw_dir, 1); 635214117Sjamie setenv("SHELL", 636214117Sjamie *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1); 637214117Sjamie if (clean && chdir(pwd->pw_dir) < 0) { 638214117Sjamie jail_warnx(j, "chdir %s: %s", 639214117Sjamie pwd->pw_dir, strerror(errno)); 640214117Sjamie exit(1); 641214117Sjamie } 642214117Sjamie endpwent(); 643214117Sjamie } 644214117Sjamie 645214117Sjamie if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) { 646214117Sjamie jail_warnx(j, "exec.consolelog: %s", strerror(errno)); 647214117Sjamie exit(1); 648214117Sjamie } 649214117Sjamie closefrom(3); 650214117Sjamie execvp(argv[0], argv); 651214117Sjamie jail_warnx(j, "exec %s: %s", argv[0], strerror(errno)); 652214117Sjamie exit(1); 653214117Sjamie} 654214117Sjamie 655214117Sjamie/* 656214117Sjamie * Add a process to the hash, tied to a jail. 657214117Sjamie */ 658246804Sjamiestatic int 659214117Sjamieadd_proc(struct cfjail *j, pid_t pid) 660214117Sjamie{ 661214117Sjamie struct kevent ke; 662214117Sjamie struct cfjail *tj; 663214117Sjamie struct phash *ph; 664214117Sjamie 665214117Sjamie if (!kq && (kq = kqueue()) < 0) 666214117Sjamie err(1, "kqueue"); 667214117Sjamie EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 668246804Sjamie if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) { 669246804Sjamie if (errno == ESRCH) 670246804Sjamie return 0; 671214117Sjamie err(1, "kevent"); 672246804Sjamie } 673214117Sjamie ph = emalloc(sizeof(struct phash)); 674214117Sjamie ph->j = j; 675214117Sjamie ph->pid = pid; 676214117Sjamie LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le); 677214117Sjamie j->nprocs++; 678216367Sjamie j->flags |= JF_SLEEPQ; 679216367Sjamie if (j->timeout.tv_sec == 0) 680216367Sjamie requeue(j, &sleeping); 681216367Sjamie else { 682216367Sjamie /* File the jail in the sleep queue acording to its timeout. */ 683214117Sjamie TAILQ_REMOVE(j->queue, j, tq); 684214117Sjamie TAILQ_FOREACH(tj, &sleeping, tq) { 685214117Sjamie if (!tj->timeout.tv_sec || 686214117Sjamie j->timeout.tv_sec < tj->timeout.tv_sec || 687214117Sjamie (j->timeout.tv_sec == tj->timeout.tv_sec && 688214117Sjamie j->timeout.tv_nsec <= tj->timeout.tv_nsec)) { 689214117Sjamie TAILQ_INSERT_BEFORE(tj, j, tq); 690214117Sjamie break; 691214117Sjamie } 692214117Sjamie } 693214117Sjamie if (tj == NULL) 694214117Sjamie TAILQ_INSERT_TAIL(&sleeping, j, tq); 695214117Sjamie j->queue = &sleeping; 696216367Sjamie } 697246804Sjamie return 1; 698214117Sjamie} 699214117Sjamie 700214117Sjamie/* 701214117Sjamie * Remove any processes from the hash that correspond to a jail. 702214117Sjamie */ 703214117Sjamiestatic void 704214117Sjamieclear_procs(struct cfjail *j) 705214117Sjamie{ 706214117Sjamie struct kevent ke; 707214117Sjamie struct phash *ph, *tph; 708214117Sjamie int i; 709214117Sjamie 710214117Sjamie j->nprocs = 0; 711214117Sjamie for (i = 0; i < PHASH_SIZE; i++) 712214117Sjamie LIST_FOREACH_SAFE(ph, &phash[i], le, tph) 713214117Sjamie if (ph->j == j) { 714214117Sjamie EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE, 715214117Sjamie NOTE_EXIT, 0, NULL); 716214117Sjamie (void)kevent(kq, &ke, 1, NULL, 0, NULL); 717214117Sjamie LIST_REMOVE(ph, le); 718214117Sjamie free(ph); 719214117Sjamie } 720214117Sjamie} 721214117Sjamie 722214117Sjamie/* 723214117Sjamie * Find the jail that corresponds to an exited process. 724214117Sjamie */ 725214117Sjamiestatic struct cfjail * 726214117Sjamiefind_proc(pid_t pid) 727214117Sjamie{ 728214117Sjamie struct cfjail *j; 729214117Sjamie struct phash *ph; 730214117Sjamie 731214117Sjamie LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le) 732214117Sjamie if (ph->pid == pid) { 733214117Sjamie j = ph->j; 734214117Sjamie LIST_REMOVE(ph, le); 735214117Sjamie free(ph); 736214117Sjamie return --j->nprocs ? NULL : j; 737214117Sjamie } 738214117Sjamie return NULL; 739214117Sjamie} 740214117Sjamie 741214117Sjamie/* 742216367Sjamie * Send SIGTERM to all processes in a jail and wait for them to die. 743216367Sjamie */ 744216367Sjamiestatic int 745216367Sjamieterm_procs(struct cfjail *j) 746216367Sjamie{ 747216367Sjamie struct kinfo_proc *ki; 748216367Sjamie int i, noted, pcnt, timeout; 749216367Sjamie 750216367Sjamie static kvm_t *kd; 751216367Sjamie 752216367Sjamie if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout)) 753216367Sjamie timeout = DEFAULT_STOP_TIMEOUT; 754216367Sjamie else if (timeout == 0) 755216367Sjamie return 0; 756216367Sjamie 757216367Sjamie if (kd == NULL) { 758231238Sjamie kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL); 759216367Sjamie if (kd == NULL) 760231238Sjamie return 0; 761216367Sjamie } 762216367Sjamie 763216367Sjamie ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt); 764216367Sjamie if (ki == NULL) 765231238Sjamie return 0; 766216367Sjamie noted = 0; 767216367Sjamie for (i = 0; i < pcnt; i++) 768216367Sjamie if (ki[i].ki_jid == j->jid && 769216367Sjamie kill(ki[i].ki_pid, SIGTERM) == 0) { 770246804Sjamie (void)add_proc(j, ki[i].ki_pid); 771216367Sjamie if (verbose > 0) { 772216367Sjamie if (!noted) { 773216367Sjamie noted = 1; 774216367Sjamie jail_note(j, "sent SIGTERM to:"); 775216367Sjamie } 776216367Sjamie printf(" %d", ki[i].ki_pid); 777216367Sjamie } 778216367Sjamie } 779216367Sjamie if (noted) 780216367Sjamie printf("\n"); 781216367Sjamie if (j->nprocs > 0) { 782216367Sjamie clock_gettime(CLOCK_REALTIME, &j->timeout); 783216367Sjamie j->timeout.tv_sec += timeout; 784216367Sjamie return 1; 785216367Sjamie } 786216367Sjamie return 0; 787216367Sjamie} 788216367Sjamie 789216367Sjamie/* 790214117Sjamie * Look up a user in the passwd and login.conf files. 791214117Sjamie */ 792214117Sjamiestatic int 793214117Sjamieget_user_info(struct cfjail *j, const char *username, 794214117Sjamie const struct passwd **pwdp, login_cap_t **lcapp) 795214117Sjamie{ 796214117Sjamie const struct passwd *pwd; 797214117Sjamie 798214117Sjamie *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid()); 799214117Sjamie if (pwd == NULL) { 800214117Sjamie if (errno) 801214117Sjamie jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "", 802214117Sjamie username ? username : "", strerror(errno)); 803214117Sjamie else if (username) 804214117Sjamie jail_warnx(j, "%s: no such user", username); 805214117Sjamie else 806214117Sjamie jail_warnx(j, "unknown uid %d", getuid()); 807214117Sjamie return -1; 808214117Sjamie } 809214117Sjamie *lcapp = login_getpwclass(pwd); 810214117Sjamie if (*lcapp == NULL) { 811214117Sjamie jail_warnx(j, "getpwclass %s: %s", pwd->pw_name, 812214117Sjamie strerror(errno)); 813214117Sjamie return -1; 814214117Sjamie } 815214117Sjamie /* Set the groups while the group file is still available */ 816214117Sjamie if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) { 817214117Sjamie jail_warnx(j, "initgroups %s: %s", pwd->pw_name, 818214117Sjamie strerror(errno)); 819214117Sjamie return -1; 820214117Sjamie } 821214117Sjamie return 0; 822214117Sjamie} 823214797Sjamie 824214797Sjamie/* 825214797Sjamie * Make sure a mount or consolelog path is a valid absolute pathname 826214797Sjamie * with no symlinks. 827214797Sjamie */ 828214797Sjamiestatic int 829214805Sjamiecheck_path(struct cfjail *j, const char *pname, const char *path, int isfile, 830214805Sjamie const char *umount_type) 831214797Sjamie{ 832214805Sjamie struct stat st, mpst; 833214805Sjamie struct statfs stfs; 834214797Sjamie char *tpath, *p; 835214797Sjamie const char *jailpath; 836214797Sjamie size_t jplen; 837214797Sjamie 838214797Sjamie if (path[0] != '/') { 839214797Sjamie jail_warnx(j, "%s: %s: not an absolute pathname", 840214797Sjamie pname, path); 841214797Sjamie return -1; 842214797Sjamie } 843214797Sjamie /* 844214797Sjamie * Only check for symlinks in components below the jail's path, 845214797Sjamie * since that's where the security risk lies. 846214797Sjamie */ 847214797Sjamie jailpath = string_param(j->intparams[KP_PATH]); 848214797Sjamie if (jailpath == NULL) 849214797Sjamie jailpath = ""; 850214797Sjamie jplen = strlen(jailpath); 851214805Sjamie if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') { 852214805Sjamie tpath = alloca(strlen(path) + 1); 853214805Sjamie strcpy(tpath, path); 854214805Sjamie for (p = tpath + jplen; p != NULL; ) { 855214805Sjamie p = strchr(p + 1, '/'); 856214805Sjamie if (p) 857214805Sjamie *p = '\0'; 858214805Sjamie if (lstat(tpath, &st) < 0) { 859214805Sjamie if (errno == ENOENT && isfile && !p) 860214805Sjamie break; 861214805Sjamie jail_warnx(j, "%s: %s: %s", pname, tpath, 862214805Sjamie strerror(errno)); 863214805Sjamie return -1; 864214805Sjamie } 865214805Sjamie if (S_ISLNK(st.st_mode)) { 866214805Sjamie jail_warnx(j, "%s: %s is a symbolic link", 867214805Sjamie pname, tpath); 868214805Sjamie return -1; 869214805Sjamie } 870214805Sjamie if (p) 871214805Sjamie *p = '/'; 872214805Sjamie } 873214805Sjamie } 874214805Sjamie if (umount_type != NULL) { 875214805Sjamie if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) { 876214805Sjamie jail_warnx(j, "%s: %s: %s", pname, path, 877214797Sjamie strerror(errno)); 878214797Sjamie return -1; 879214797Sjamie } 880214805Sjamie if (stat(stfs.f_mntonname, &mpst) < 0) { 881214805Sjamie jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname, 882214805Sjamie strerror(errno)); 883214797Sjamie return -1; 884214797Sjamie } 885214805Sjamie if (st.st_ino != mpst.st_ino) { 886214805Sjamie jail_warnx(j, "%s: %s: not a mount point", 887214805Sjamie pname, path); 888214805Sjamie return -1; 889214805Sjamie } 890214805Sjamie if (strcmp(stfs.f_fstypename, umount_type)) { 891214805Sjamie jail_warnx(j, "%s: %s: not a %s mount", 892214805Sjamie pname, path, umount_type); 893214805Sjamie return -1; 894214805Sjamie } 895214797Sjamie } 896214797Sjamie return 0; 897214797Sjamie} 898