2 * Copyright (c) 1993-1996, 1998-2010 Todd C. Miller <Todd.Miller@courtesan.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20 * For a brief history of sudo, please see the HISTORY file included
21 * with this distribution.
32 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/socket.h>
38 # include <sys/time.h>
39 # include <sys/resource.h>
49 #endif /* STDC_HEADERS */
51 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
55 #endif /* HAVE_STRING_H */
58 #endif /* HAVE_STRINGS_H */
61 #endif /* HAVE_UNISTD_H */
68 #if TIME_WITH_SYS_TIME
74 #include <netinet/in.h>
76 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
79 # include <hpsecurity.h>
81 # include <sys/security.h>
84 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
85 #ifdef HAVE_LOGIN_CAP_H
86 # include <login_cap.h>
87 # ifndef LOGIN_DEFROOTCLASS
88 # define LOGIN_DEFROOTCLASS "daemon"
91 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
92 # include <membership.h>
97 #include "interfaces.h"
98 #include <sudo_usage.h>
100 #ifdef USING_NONUNIX_GROUPS
101 # include "nonunix.h"
104 #if defined(HAVE_PAM) && !defined(NO_PAM_SESSION)
105 # define CMND_WAIT TRUE
107 # define CMND_WAIT FALSE
113 static void init_vars __P((char **));
114 static int set_cmnd __P((int));
115 static void initial_setup __P((void));
116 static void set_loginclass __P((struct passwd *));
117 static void set_runasgr __P((char *));
118 static void set_runaspw __P((char *));
119 static void show_version __P((void));
120 static struct passwd *get_authpw __P((void));
121 static void create_admin_success_flag __P((void));
122 extern int sudo_edit __P((int, char **, char **));
123 int run_command __P((const char *path, char *argv[], char *envp[], uid_t uid, int dowait)); /* XXX should be in sudo.h */
129 char **Argv, **NewArgv;
131 int user_closefrom = -1;
132 struct sudo_user sudo_user;
133 struct passwd *auth_pw, *list_pw;
134 struct interface *interfaces;
139 extern int errorlineno;
140 extern int parse_error;
141 extern char *errorfile;
142 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
143 static struct rlimit corelimit;
144 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
145 #if defined(__linux__)
146 static struct rlimit nproclimit;
148 #ifdef HAVE_LOGIN_CAP_H
150 #endif /* HAVE_LOGIN_CAP_H */
151 sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
154 static struct sudo_nss_list *snl;
162 main(argc, argv, envp)
167 int sources = 0, validated;
168 int fd, cmnd_status, pwflag, rc = 0;
170 struct sudo_nss *nss;
171 #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
172 extern char *malloc_options;
173 malloc_options = "AFGJPR";
176 #ifdef HAVE_SETLOCALE
177 setlocale(LC_ALL, "");
181 if ((Argc = argc) < 1)
184 /* Must be done as the first thing... */
185 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
186 (void) set_auth_parameters(Argc, Argv);
187 # ifdef HAVE_INITPRIVS
190 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
193 errorx(1, "must be setuid root");
197 * Ignore keyboard-generated signals so the user cannot interrupt
198 * us at some point and avoid the logging.
199 * Install handler to wait for children when they exit.
201 zero_bytes(&sa, sizeof(sa));
202 sigemptyset(&sa.sa_mask);
203 sa.sa_flags = SA_RESTART;
204 sa.sa_handler = SIG_IGN;
205 (void) sigaction(SIGINT, &sa, &saved_sa_int);
206 (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
207 (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
209 /* Initialize environment functions (including replacements). */
213 * Turn off core dumps and make sure fds 0-2 are open.
219 /* Parse our arguments. */
220 sudo_mode = parse_args(Argc, Argv);
222 /* Setup defaults data structures. */
225 /* Load the list of local ip addresses and netmasks. */
229 if (ISSET(sudo_mode, MODE_SHELL))
231 else if (ISSET(sudo_mode, MODE_EDIT))
232 user_cmnd = "sudoedit";
242 case MODE_VALIDATE|MODE_INVALIDATE:
243 user_cmnd = "validate";
247 case MODE_INVALIDATE:
256 case MODE_LIST|MODE_INVALIDATE:
261 case MODE_CHECK|MODE_INVALIDATE:
267 /* Must have a command to run... */
268 if (user_cmnd == NULL && NewArgc == 0)
271 init_vars(envp); /* XXX - move this later? */
273 #ifdef USING_NONUNIX_GROUPS
274 sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */
275 #endif /* USING_NONUNIX_GROUPS */
277 /* Parse nsswitch.conf for sudoers order. */
278 snl = sudo_read_nss();
280 /* Open and parse sudoers, set global defaults */
281 tq_foreach_fwd(snl, nss) {
282 if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
284 if (nss->setdefs(nss) != 0)
285 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
289 log_error(0, "no valid sudoers sources found, quitting");
291 /* XXX - collect post-sudoers parse settings into a function */
294 * Set runas passwd/group entries based on command line or sudoers.
295 * Note that if runas_group was specified without runas_user we
296 * defer setting runas_pw so the match routines know to ignore it.
298 if (runas_group != NULL) {
299 set_runasgr(runas_group);
300 if (runas_user != NULL)
301 set_runaspw(runas_user);
303 set_runaspw(runas_user ? runas_user : def_runas_default);
305 if (!update_defaults(SETDEF_RUNAS))
306 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
309 set_fqdn(); /* deferred until after sudoers is parsed */
311 /* Set login class if applicable. */
312 set_loginclass(sudo_user.pw);
314 /* Update initial shell now that runas is set. */
315 if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
316 NewArgv[0] = runas_pw->pw_shell;
318 /* This goes after sudoers is parsed since it may have timestamp options. */
319 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
320 remove_timestamp((sudo_mode == MODE_KILL));
325 /* Is root even allowed to run sudo? */
326 if (user_uid == 0 && !def_root_sudo) {
327 (void) fprintf(stderr,
328 "Sorry, %s has been configured to not allow root to run it.\n",
333 /* Check for -C overriding def_closefrom. */
334 if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
335 if (!def_closefrom_override)
336 errorx(1, "you are not permitted to use the -C option");
338 def_closefrom = user_closefrom;
341 cmnd_status = set_cmnd(sudo_mode);
343 #ifdef HAVE_SETLOCALE
344 if (!setlocale(LC_ALL, def_sudoers_locale)) {
345 warningx("unable to set locale to \"%s\", using \"C\"",
347 setlocale(LC_ALL, "C");
351 validated = FLAG_NO_USER | FLAG_NO_HOST;
352 tq_foreach_fwd(snl, nss) {
353 validated = nss->lookup(nss, validated, pwflag);
355 if (ISSET(validated, VALIDATE_OK)) {
356 /* Handle "= auth" in netsvc.conf */
357 if (nss->ret_if_found)
360 /* Handle [NOTFOUND=return] */
361 if (nss->ret_if_notfound)
366 if (safe_cmnd == NULL)
367 safe_cmnd = estrdup(user_cmnd);
369 #ifdef HAVE_SETLOCALE
370 setlocale(LC_ALL, "");
373 /* If only a group was specified, set runas_pw based on invoking user. */
374 if (runas_pw == NULL)
375 set_runaspw(user_name);
378 * Look up the timestamp dir owner if one is specified.
380 if (def_timestampowner) {
383 if (*def_timestampowner == '#')
384 pw = sudo_getpwuid(atoi(def_timestampowner + 1));
386 pw = sudo_getpwnam(def_timestampowner);
388 log_error(0, "timestamp owner (%s): No such user",
390 timestamp_uid = pw->pw_uid;
393 /* If given the -P option, set the "preserve_groups" flag. */
394 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
395 def_preserve_groups = TRUE;
397 /* If no command line args and "set_home" is not set, error out. */
398 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
401 /* Bail if a tty is required and we don't have one. */
402 if (def_requiretty) {
403 if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
404 audit_failure(NewArgv, "no tty");
405 log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
410 /* Use askpass value from sudoers unless user specified their own. */
411 if (def_askpass && !user_askpass)
412 user_askpass = def_askpass;
415 * We don't reset the environment for sudoedit or if the user
416 * specified the -E command line flag and they have setenv privs.
418 if (ISSET(sudo_mode, MODE_EDIT) ||
419 (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv))
420 def_env_reset = FALSE;
422 /* Build a new environment that avoids any nasty bits. */
423 rebuild_env(def_noexec);
425 /* Fill in passwd struct based on user we are authenticating as. */
426 auth_pw = get_authpw();
428 /* Require a password if sudoers says so. */
429 if (def_authenticate)
430 check_user(validated, sudo_mode);
432 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
433 /* XXX - causes confusion when root is not listed in sudoers */
434 if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
435 if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
438 if ((pw = sudo_getpwnam(prev_user)) != NULL) {
440 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
441 mbr_uid_to_uuid(user_uid, user_uuid);
447 if (ISSET(validated, VALIDATE_OK)) {
448 /* Create Ubuntu-style dot file to indicate sudo was successful. */
449 create_admin_success_flag();
451 /* Finally tell the user if the command did not exist. */
452 if (cmnd_status == NOT_FOUND_DOT) {
453 audit_failure(NewArgv, "command in current directory");
454 errorx(1, "ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
455 } else if (cmnd_status == NOT_FOUND) {
456 audit_failure(NewArgv, "%s: command not found", user_cmnd);
457 errorx(1, "%s: command not found", user_cmnd);
460 /* If user specified env vars make sure sudoers allows it. */
461 if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
462 if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
464 "sorry, you are not allowed to preserve the environment");
466 validate_env_vars(sudo_user.env_vars);
469 #ifdef _PATH_SUDO_IO_LOGDIR
470 /* Get next session ID so we can log it. */
471 if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && (def_log_input || def_log_output))
474 log_allowed(validated);
475 if (ISSET(sudo_mode, MODE_CHECK))
476 rc = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
477 else if (ISSET(sudo_mode, MODE_LIST))
478 display_privs(snl, list_pw ? list_pw : sudo_user.pw);
480 /* Cleanup sudoers sources */
481 tq_foreach_fwd(snl, nss)
484 #ifdef USING_NONUNIX_GROUPS
485 /* Finished with the groupcheck code */
486 sudo_nonunix_groupcheck_cleanup();
489 /* Deferred exit due to sudo_ldap_close() */
490 if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST)))
493 /* Must audit before uid change. */
494 audit_success(NewArgv);
496 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
499 /* Convert /bin/sh -> -sh so shell knows it is a login shell */
500 if ((p = strrchr(NewArgv[0], '/')) == NULL)
505 #if defined(__linux__) || defined(_AIX)
506 /* Insert system-wide environment variables. */
507 read_env_file(_PATH_ENVIRONMENT, TRUE);
511 if (ISSET(sudo_mode, MODE_RUN)) {
512 /* Insert system-wide environment variables. */
514 read_env_file(def_env_file, FALSE);
516 /* Insert user-specified environment variables. */
517 insert_env_vars(sudo_user.env_vars);
520 /* Restore signal handlers before we exec. */
521 (void) sigaction(SIGINT, &saved_sa_int, NULL);
522 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
523 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
525 if (ISSET(sudo_mode, MODE_EDIT)) {
526 exit(sudo_edit(NewArgc, NewArgv, envp));
528 exit(run_command(safe_cmnd, NewArgv, env_get(), runas_pw->pw_uid,
531 } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
532 audit_failure(NewArgv, "No user or host");
533 log_denial(validated, 1);
538 * We'd like to not leak path info at all here, but that can
539 * *really* confuse the users. To really close the leak we'd
540 * have to say "not allowed to run foo" even when the problem
541 * is just "no foo in path" since the user can trivially set
542 * their path to just contain a single dir.
544 log_denial(validated,
545 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
546 if (cmnd_status == NOT_FOUND)
547 warningx("%s: command not found", user_cmnd);
548 else if (cmnd_status == NOT_FOUND_DOT)
549 warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
551 /* Just tell the user they are not allowed to run foo. */
552 log_denial(validated, 1);
554 audit_failure(NewArgv, "validation failure");
557 exit(0); /* not reached */
561 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
562 * load the ``interfaces'' array.
568 char *p, **ep, thost[MAXHOSTNAMELEN + 1];
571 /* Sanity check command from user. */
572 if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
573 errorx(1, "%s: File name too long", NewArgv[0]);
576 (void) tzset(); /* set the timezone if applicable */
577 #endif /* HAVE_TZSET */
579 /* Default value for cmnd and cwd, overridden later. */
580 if (user_cmnd == NULL)
581 user_cmnd = NewArgv[0];
582 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
585 * We avoid gethostbyname() if possible since we don't want
586 * sudo to block if DNS or NIS is hosed.
587 * "host" is the (possibly fully-qualified) hostname and
588 * "shost" is the unqualified form of the hostname.
590 nohostname = gethostname(thost, sizeof(thost));
592 user_host = user_shost = "localhost";
594 thost[sizeof(thost) - 1] = '\0';
595 user_host = estrdup(thost);
596 if ((p = strchr(user_host, '.'))) {
598 user_shost = estrdup(user_host);
601 user_shost = user_host;
605 if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO)) ||
606 (p = ttyname(STDERR_FILENO))) {
607 user_tty = user_ttypath = estrdup(p);
608 if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
609 user_tty += sizeof(_PATH_DEV) - 1;
611 user_tty = "unknown";
613 for (ep = envp; *ep; ep++) {
614 /* XXX - don't fill in if empty string */
617 if (strncmp("DISPLAY=", *ep, 8) == 0)
618 user_display = *ep + 8;
621 if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
622 user_ccname = *ep + 11;
625 if (strncmp("PATH=", *ep, 5) == 0)
629 if (strncmp("SHELL=", *ep, 6) == 0)
630 user_shell = *ep + 6;
631 else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
632 user_prompt = *ep + 12;
633 else if (strncmp("SUDO_USER=", *ep, 10) == 0)
634 prev_user = *ep + 10;
635 else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
636 user_askpass = *ep + 13;
642 * Get a local copy of the user's struct passwd with the shadow password
643 * if necessary. It is assumed that euid is 0 at this point so we
644 * can read the shadow passwd file if necessary.
646 if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
647 /* Need to make a fake struct passwd for logging to work. */
649 char pw_name[MAX_UID_T_LEN + 1];
651 pw.pw_uid = getuid();
652 (void) snprintf(pw_name, sizeof(pw_name), "%lu",
653 (unsigned long) pw.pw_uid);
654 pw.pw_name = pw_name;
658 * If we are in -k/-K mode, just spew to stderr. It is not unusual for
659 * users to place "sudo -k" in a .logout file which can cause sudo to
660 * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
662 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
663 errorx(1, "unknown uid: %s", pw_name);
664 log_error(0, "unknown uid: %s", pw_name);
666 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
667 mbr_uid_to_uuid(user_uid, user_uuid);
669 if (user_shell == NULL || *user_shell == '\0')
670 user_shell = estrdup(sudo_user.pw->pw_shell);
672 /* It is now safe to use log_error() and set_perms() */
674 #ifdef HAVE_GETGROUPS
675 if ((user_ngroups = getgroups(0, NULL)) > 0) {
676 user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
677 if (getgroups(user_ngroups, user_groups) < 0)
678 log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
683 log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
686 * Get current working directory. Try as user, fall back to root.
688 set_perms(PERM_USER);
689 if (!getcwd(user_cwd, sizeof(user_cwd))) {
690 set_perms(PERM_ROOT);
691 if (!getcwd(user_cwd, sizeof(user_cwd))) {
692 warningx("cannot get working directory");
693 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
696 set_perms(PERM_ROOT);
699 * If in shell or edit mode, or if running a pseudo-command
700 * such as "list", we need to redo NewArgv and NewArgc.
702 if (ISSET(sudo_mode, MODE_SHELL)) {
705 /* Allocate an extra slot for execve() failure (ENOEXEC). */
706 av = (char **) emalloc2(5, sizeof(char *));
709 av[0] = user_shell; /* may be updated later */
711 size_t cmnd_size = 1024;
712 char *cmnd, *src, *dst, **ap;
714 cmnd = dst = emalloc(cmnd_size);
715 for (ap = NewArgv; *ap != NULL; ap++) {
716 for (src = *ap; *src != '\0'; src++) {
717 /* reserve room for an escaped char + space */
718 if (cmnd_size < (dst - cmnd) + 3) {
721 new_cmnd = erealloc(cmnd, cmnd_size);
722 dst = new_cmnd + (dst - cmnd);
725 if (isalnum((unsigned char)*src) || *src == '_' || *src == '-') {
728 /* quote potential meta character */
736 dst--; /* replace last space with a NUL */
742 av[++NewArgc] = NULL;
744 } else if (ISSET(sudo_mode, MODE_EDIT) || NewArgc == 0) {
747 NewArgv[0] = user_cmnd;
752 * Fill in user_cmnd, user_args, user_base and user_stat variables
753 * and apply any command-specific defaults entries.
760 char *path = user_path;
762 /* Resolve the path and return. */
764 user_stat = emalloc(sizeof(struct stat));
765 if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
766 if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
767 if (def_secure_path && !user_is_exempt())
768 path = def_secure_path;
769 set_perms(PERM_RUNAS);
770 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
772 set_perms(PERM_ROOT);
774 /* Failed as root, try as invoking user. */
775 set_perms(PERM_USER);
776 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
778 set_perms(PERM_ROOT);
787 /* If we didn't realloc NewArgv it is contiguous so just count. */
788 if (!ISSET(sudo_mode, MODE_SHELL)) {
789 size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
790 strlen(NewArgv[NewArgc-1]) + 1;
792 for (size = 0, from = NewArgv + 1; *from; from++)
793 size += strlen(*from) + 1;
796 /* Alloc and build up user_args. */
797 user_args = (char *) emalloc(size);
798 for (to = user_args, from = NewArgv + 1; *from; from++) {
799 n = strlcpy(to, *from, size - (to - user_args));
800 if (n >= size - (to - user_args))
801 errorx(1, "internal error, init_vars() overflow");
808 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
811 user_base = user_cmnd;
813 if (!update_defaults(SETDEF_CMND))
814 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
816 if (!runas_user && !runas_group)
817 set_runaspw(def_runas_default); /* may have been updated above */
823 * Setup the execution environment immediately prior to the call to execve()
824 * Returns TRUE on success and FALSE on failure.
827 exec_setup(rbac_enabled, ttyname, ttyfd)
836 if (selinux_setup(user_role, user_type, ttyname, ttyfd) == -1)
841 /* Close the password and group files and free up memory. */
846 * For sudoedit, the command runas a the user with no additional setup.
848 if (ISSET(sudo_mode, MODE_EDIT)) {
849 set_perms(PERM_FULL_USER);
855 * Set umask based on sudoers.
856 * If user's umask is more restrictive, OR in those bits too
857 * unless umask_override is set.
859 if (def_umask != 0777) {
860 if (def_umask_override) {
863 mode_t mask = umask(def_umask);
865 if (mask != def_umask)
870 /* Restore coredumpsize resource limit. */
871 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
872 (void) setrlimit(RLIMIT_CORE, &corelimit);
873 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
875 if (ISSET(sudo_mode, MODE_RUN))
876 set_perms(PERM_FULL_RUNAS);
878 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
879 /* Change to target user's homedir. */
880 if (chdir(runas_pw->pw_dir) == -1) {
881 warning("unable to change directory to %s", runas_pw->pw_dir);
887 * Restore nproc resource limit if pam_limits didn't do it for us.
888 * We must do this *after* the uid change to avoid potential EAGAIN
891 #if defined(__linux__)
894 if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
895 if (rl.rlim_cur == RLIM_INFINITY && rl.rlim_max == RLIM_INFINITY)
896 (void) setrlimit(RLIMIT_NPROC, &nproclimit);
908 * Run the command and wait for it to complete.
911 run_command(path, argv, envp, uid, dowait)
918 struct command_status cstat;
925 cstat.type = CMD_INVALID;
928 sudo_execve(path, argv, envp, uid, &cstat, dowait,
929 ISSET(sudo_mode, MODE_BACKGROUND));
931 switch (cstat.type) {
933 /* exec_setup() or execve() returned an error. */
934 warningx("unable to execute %s: %s", path, strerror(cstat.val));
938 /* Command ran, exited or was killed. */
939 if (WIFEXITED(cstat.val))
940 exitcode = WEXITSTATUS(cstat.val);
941 else if (WIFSIGNALED(cstat.val))
942 exitcode = WTERMSIG(cstat.val) | 128;
945 warningx("unexpected child termination condition: %d", cstat.type);
950 #endif /* HAVE_PAM */
951 #ifdef _PATH_SUDO_IO_LOGDIR
958 * Open sudoers and sanity check mode/owner/type.
959 * Returns a handle to the sudoers file or NULL on error.
962 open_sudoers(sudoers, doedit, keepopen)
972 * Fix the mode and group on sudoers file from old default.
973 * Only works if file system is readable/writable by root.
975 if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
976 SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
977 (statbuf.st_mode & 0007777) == 0400) {
979 if (chmod(sudoers, SUDOERS_MODE) == 0) {
980 warningx("fixed mode on %s", sudoers);
981 SET(statbuf.st_mode, SUDOERS_MODE);
982 if (statbuf.st_gid != SUDOERS_GID) {
983 if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
984 warningx("set group on %s", sudoers);
985 statbuf.st_gid = SUDOERS_GID;
987 warning("unable to set group on %s", sudoers);
990 warning("unable to fix mode on %s", sudoers);
994 * Sanity checks on sudoers file. Must be done as sudoers
995 * file owner. We already did a stat as root, so use that
996 * data if we can't stat as sudoers file owner.
998 set_perms(PERM_SUDOERS);
1000 if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
1001 log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
1002 else if (!S_ISREG(statbuf.st_mode))
1003 log_error(NO_EXIT, "%s is not a regular file", sudoers);
1004 else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
1005 log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
1006 (unsigned int) (statbuf.st_mode & 07777),
1007 (unsigned int) SUDOERS_MODE);
1008 else if (statbuf.st_uid != SUDOERS_UID)
1009 log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
1010 (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1011 else if (statbuf.st_gid != SUDOERS_GID)
1012 log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
1013 (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1014 else if ((fp = fopen(sudoers, "r")) == NULL)
1015 log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers);
1018 * Make sure we can actually read sudoers so we can present the
1019 * user with a reasonable error message (unlike the lexer).
1021 if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
1022 log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers);
1030 (void) fcntl(fileno(fp), F_SETFD, 1);
1033 set_perms(PERM_ROOT); /* change back to root */
1038 * Close all open files (except std*) and turn off core dumps.
1039 * Also sets the set_perms() pointer to the correct function.
1044 int miss[3], devnull = -1;
1045 #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1049 #if defined(__linux__)
1051 * Unlimit the number of processes since Linux's setuid() will
1052 * apply resource limits when changing uid and return EAGAIN if
1053 * nproc would be violated by the uid switch.
1055 (void) getrlimit(RLIMIT_NPROC, &nproclimit);
1056 rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1057 if (setrlimit(RLIMIT_NPROC, &rl)) {
1058 memcpy(&rl, &nproclimit, sizeof(struct rlimit));
1059 rl.rlim_cur = rl.rlim_max;
1060 (void)setrlimit(RLIMIT_NPROC, &rl);
1062 #endif /* __linux__ */
1063 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1065 * Turn off core dumps.
1067 (void) getrlimit(RLIMIT_CORE, &corelimit);
1068 memcpy(&rl, &corelimit, sizeof(struct rlimit));
1070 (void) setrlimit(RLIMIT_CORE, &rl);
1071 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1074 * stdin, stdout and stderr must be open; set them to /dev/null
1075 * if they are closed and close all other fds.
1077 miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1078 miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1079 miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1080 if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1081 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) == -1)
1082 error(1, "unable to open %s", _PATH_DEVNULL);
1083 if (miss[STDIN_FILENO] && dup2(devnull, STDIN_FILENO) == -1)
1085 if (miss[STDOUT_FILENO] && dup2(devnull, STDOUT_FILENO) == -1)
1087 if (miss[STDERR_FILENO] && dup2(devnull, STDERR_FILENO) == -1)
1089 if (devnull > STDERR_FILENO)
1094 #ifdef HAVE_LOGIN_CAP_H
1102 * Don't make it a fatal error if the user didn't specify the login
1103 * class themselves. We do this because if login.conf gets
1104 * corrupted we want the admin to be able to use sudo to fix it.
1107 errflags = NO_MAIL|MSG_ONLY;
1109 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1111 if (login_class && strcmp(login_class, "-") != 0) {
1112 if (user_uid != 0 &&
1113 strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1114 errorx(1, "only root can use -c %s", login_class);
1116 login_class = pw->pw_class;
1117 if (!login_class || !*login_class)
1119 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1122 lc = login_getclass(login_class);
1123 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1124 log_error(errflags, "unknown login class: %s", login_class);
1126 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1135 #endif /* HAVE_LOGIN_CAP_H */
1138 * Look up the fully qualified domain name and set user_host and user_shost.
1143 #ifdef HAVE_GETADDRINFO
1144 struct addrinfo *res0, hint;
1150 #ifdef HAVE_GETADDRINFO
1151 zero_bytes(&hint, sizeof(hint));
1152 hint.ai_family = PF_UNSPEC;
1153 hint.ai_flags = AI_CANONNAME;
1154 if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1156 if (!(hp = gethostbyname(user_host))) {
1158 log_error(MSG_ONLY|NO_EXIT,
1159 "unable to resolve host %s", user_host);
1161 if (user_shost != user_host)
1164 #ifdef HAVE_GETADDRINFO
1165 user_host = estrdup(res0->ai_canonname);
1168 user_host = estrdup(hp->h_name);
1171 if ((p = strchr(user_host, '.'))) {
1173 user_shost = estrdup(user_host);
1176 user_shost = user_host;
1181 * Get passwd entry for the user we are going to run commands as.
1182 * By default, this is "root". Updates runas_pw as a side effect.
1189 if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1190 runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1192 if ((runas_pw = sudo_getpwnam(user)) == NULL) {
1193 audit_failure(NewArgv, "unknown user: %s", user);
1194 log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
1200 * Get group entry for the group we are going to run commands as.
1201 * Updates runas_pw as a side effect.
1207 if (*group == '#') {
1208 if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1209 runas_gr = sudo_fakegrnam(group);
1211 if ((runas_gr = sudo_getgrnam(group)) == NULL)
1212 log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
1217 * Get passwd entry for the user we are going to authenticate as.
1218 * By default, this is the user invoking sudo. In the most common
1219 * case, this matches sudo_user.pw or runas_pw.
1221 static struct passwd *
1227 if ((pw = sudo_getpwuid(0)) == NULL)
1228 log_error(0, "unknown uid: 0");
1229 } else if (def_runaspw) {
1230 if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1231 log_error(0, "unknown user: %s", def_runas_default);
1232 } else if (def_targetpw) {
1233 if (runas_pw->pw_name == NULL)
1234 log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
1235 (unsigned long) runas_pw->pw_uid);
1244 * Cleanup hook for error()/errorx()
1250 struct sudo_nss *nss;
1254 tq_foreach_fwd(snl, nss)
1257 #ifdef USING_NONUNIX_GROUPS
1258 sudo_nonunix_groupcheck_cleanup();
1262 #ifdef _PATH_SUDO_IO_LOGDIR
1266 term_restore(STDIN_FILENO, 0);
1268 selinux_restore_tty();
1275 (void) printf("Sudo version %s\n", PACKAGE_VERSION);
1276 if (getuid() == 0) {
1278 (void) printf("Configure args: %s\n", CONFIGURE_ARGS);
1279 (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
1281 # ifdef _PATH_NSSWITCH_CONF
1282 (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
1284 (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
1285 (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
1287 dump_auth_methods();
1294 #ifdef USE_ADMIN_FLAG
1296 create_admin_success_flag()
1298 struct stat statbuf;
1299 char flagfile[PATH_MAX];
1302 /* Check whether the user is in the admin group. */
1303 if (!user_in_group(sudo_user.pw, "admin"))
1306 /* Build path to flag file. */
1307 n = snprintf(flagfile, sizeof(flagfile), "%s/.sudo_as_admin_successful",
1309 if (n <= 0 || n >= sizeof(flagfile))
1312 /* Create admin flag file if it doesn't already exist. */
1313 set_perms(PERM_USER);
1314 if (stat(flagfile, &statbuf) == 0) {
1315 set_perms(PERM_ROOT);
1319 fd = open(flagfile, O_CREAT|O_WRONLY|O_EXCL, 0644);
1321 set_perms(PERM_ROOT);
1323 #else /* !USE_ADMIN_FLAG */
1325 create_admin_success_flag()
1329 #endif /* USE_ADMIN_FLAG */