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"
93 # include <sys/task.h>
95 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
96 # include <membership.h>
101 #include "interfaces.h"
102 #include <sudo_usage.h>
104 #ifdef USING_NONUNIX_GROUPS
105 # include "nonunix.h"
108 #if defined(HAVE_PAM) && !defined(NO_PAM_SESSION)
109 # define CMND_WAIT TRUE
111 # define CMND_WAIT FALSE
117 static void init_vars __P((char **));
118 static int set_cmnd __P((int));
119 static void initial_setup __P((void));
120 static void set_loginclass __P((struct passwd *));
121 static void set_project __P((struct passwd *));
122 static void set_runasgr __P((char *));
123 static void set_runaspw __P((char *));
124 static void show_version __P((void));
125 static struct passwd *get_authpw __P((void));
126 static void create_admin_success_flag __P((void));
127 extern int sudo_edit __P((int, char **, char **));
128 int run_command __P((const char *path, char *argv[], char *envp[], uid_t uid, int dowait)); /* XXX should be in sudo.h */
134 char **Argv, **NewArgv;
136 int user_closefrom = -1;
137 struct sudo_user sudo_user;
138 struct passwd *auth_pw, *list_pw;
139 struct interface *interfaces;
144 extern int errorlineno;
145 extern int parse_error;
146 extern char *errorfile;
147 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
148 static struct rlimit corelimit;
149 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
150 #if defined(__linux__)
151 static struct rlimit nproclimit;
153 #ifdef HAVE_LOGIN_CAP_H
155 #endif /* HAVE_LOGIN_CAP_H */
156 sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
159 static struct sudo_nss_list *snl;
167 main(argc, argv, envp)
172 int sources = 0, validated;
173 int fd, cmnd_status, pwflag, rc = 0;
175 struct sudo_nss *nss;
176 #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
177 extern char *malloc_options;
178 malloc_options = "AFGJPR";
181 #ifdef HAVE_SETLOCALE
182 setlocale(LC_ALL, "");
186 if ((Argc = argc) < 1)
189 /* Must be done as the first thing... */
190 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
191 (void) set_auth_parameters(Argc, Argv);
192 # ifdef HAVE_INITPRIVS
195 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
198 errorx(1, "must be setuid root");
202 * Ignore keyboard-generated signals so the user cannot interrupt
203 * us at some point and avoid the logging.
204 * Install handler to wait for children when they exit.
206 zero_bytes(&sa, sizeof(sa));
207 sigemptyset(&sa.sa_mask);
208 sa.sa_flags = SA_RESTART;
209 sa.sa_handler = SIG_IGN;
210 (void) sigaction(SIGINT, &sa, &saved_sa_int);
211 (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
212 (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
214 /* Initialize environment functions (including replacements). */
218 * Turn off core dumps and make sure fds 0-2 are open.
224 /* Parse our arguments. */
225 sudo_mode = parse_args(Argc, Argv);
227 /* Setup defaults data structures. */
230 /* Load the list of local ip addresses and netmasks. */
234 if (ISSET(sudo_mode, MODE_SHELL))
236 else if (ISSET(sudo_mode, MODE_EDIT))
237 user_cmnd = "sudoedit";
247 case MODE_VALIDATE|MODE_INVALIDATE:
248 user_cmnd = "validate";
252 case MODE_INVALIDATE:
261 case MODE_LIST|MODE_INVALIDATE:
266 case MODE_CHECK|MODE_INVALIDATE:
272 /* Must have a command to run... */
273 if (user_cmnd == NULL && NewArgc == 0)
276 init_vars(envp); /* XXX - move this later? */
278 #ifdef USING_NONUNIX_GROUPS
279 sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */
280 #endif /* USING_NONUNIX_GROUPS */
282 /* Parse nsswitch.conf for sudoers order. */
283 snl = sudo_read_nss();
285 /* Open and parse sudoers, set global defaults */
286 tq_foreach_fwd(snl, nss) {
287 if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
289 if (nss->setdefs(nss) != 0)
290 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
294 log_error(0, "no valid sudoers sources found, quitting");
296 /* XXX - collect post-sudoers parse settings into a function */
299 * Set runas passwd/group entries based on command line or sudoers.
300 * Note that if runas_group was specified without runas_user we
301 * defer setting runas_pw so the match routines know to ignore it.
303 if (runas_group != NULL) {
304 set_runasgr(runas_group);
305 if (runas_user != NULL)
306 set_runaspw(runas_user);
308 set_runaspw(runas_user ? runas_user : def_runas_default);
310 if (!update_defaults(SETDEF_RUNAS))
311 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
314 set_fqdn(); /* deferred until after sudoers is parsed */
316 /* Set login class if applicable. */
317 set_loginclass(sudo_user.pw);
319 /* Update initial shell now that runas is set. */
320 if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
321 NewArgv[0] = runas_pw->pw_shell;
323 /* This goes after sudoers is parsed since it may have timestamp options. */
324 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
325 remove_timestamp((sudo_mode == MODE_KILL));
330 /* Is root even allowed to run sudo? */
331 if (user_uid == 0 && !def_root_sudo) {
332 (void) fprintf(stderr,
333 "Sorry, %s has been configured to not allow root to run it.\n",
338 /* Check for -C overriding def_closefrom. */
339 if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
340 if (!def_closefrom_override)
341 errorx(1, "you are not permitted to use the -C option");
343 def_closefrom = user_closefrom;
346 cmnd_status = set_cmnd(sudo_mode);
348 #ifdef HAVE_SETLOCALE
349 if (!setlocale(LC_ALL, def_sudoers_locale)) {
350 warningx("unable to set locale to \"%s\", using \"C\"",
352 setlocale(LC_ALL, "C");
356 validated = FLAG_NO_USER | FLAG_NO_HOST;
357 tq_foreach_fwd(snl, nss) {
358 validated = nss->lookup(nss, validated, pwflag);
360 if (ISSET(validated, VALIDATE_OK)) {
361 /* Handle "= auth" in netsvc.conf */
362 if (nss->ret_if_found)
365 /* Handle [NOTFOUND=return] */
366 if (nss->ret_if_notfound)
371 if (safe_cmnd == NULL)
372 safe_cmnd = estrdup(user_cmnd);
374 #ifdef HAVE_SETLOCALE
375 setlocale(LC_ALL, "");
378 /* If only a group was specified, set runas_pw based on invoking user. */
379 if (runas_pw == NULL)
380 set_runaspw(user_name);
383 * Look up the timestamp dir owner if one is specified.
385 if (def_timestampowner) {
388 if (*def_timestampowner == '#')
389 pw = sudo_getpwuid(atoi(def_timestampowner + 1));
391 pw = sudo_getpwnam(def_timestampowner);
393 log_error(0, "timestamp owner (%s): No such user",
395 timestamp_uid = pw->pw_uid;
398 /* If given the -P option, set the "preserve_groups" flag. */
399 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
400 def_preserve_groups = TRUE;
402 /* If no command line args and "set_home" is not set, error out. */
403 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
406 /* Bail if a tty is required and we don't have one. */
407 if (def_requiretty) {
408 if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
409 audit_failure(NewArgv, "no tty");
410 log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
415 /* Use askpass value from sudoers unless user specified their own. */
416 if (def_askpass && !user_askpass)
417 user_askpass = def_askpass;
420 * We don't reset the environment for sudoedit or if the user
421 * specified the -E command line flag and they have setenv privs.
423 if (ISSET(sudo_mode, MODE_EDIT) ||
424 (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv))
425 def_env_reset = FALSE;
427 /* Build a new environment that avoids any nasty bits. */
428 rebuild_env(def_noexec);
430 /* Fill in passwd struct based on user we are authenticating as. */
431 auth_pw = get_authpw();
433 /* Require a password if sudoers says so. */
434 if (def_authenticate)
435 check_user(validated, sudo_mode);
437 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
438 /* XXX - causes confusion when root is not listed in sudoers */
439 if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
440 if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
443 if ((pw = sudo_getpwnam(prev_user)) != NULL) {
445 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
446 mbr_uid_to_uuid(user_uid, user_uuid);
452 if (ISSET(validated, VALIDATE_OK)) {
453 /* Create Ubuntu-style dot file to indicate sudo was successful. */
454 create_admin_success_flag();
456 /* Finally tell the user if the command did not exist. */
457 if (cmnd_status == NOT_FOUND_DOT) {
458 audit_failure(NewArgv, "command in current directory");
459 errorx(1, "ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
460 } else if (cmnd_status == NOT_FOUND) {
461 audit_failure(NewArgv, "%s: command not found", user_cmnd);
462 errorx(1, "%s: command not found", user_cmnd);
465 /* If user specified env vars make sure sudoers allows it. */
466 if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
467 if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
469 "sorry, you are not allowed to preserve the environment");
471 validate_env_vars(sudo_user.env_vars);
474 #ifdef _PATH_SUDO_IO_LOGDIR
475 /* Get next session ID so we can log it. */
476 if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && (def_log_input || def_log_output))
479 log_allowed(validated);
480 if (ISSET(sudo_mode, MODE_CHECK))
481 rc = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
482 else if (ISSET(sudo_mode, MODE_LIST))
483 display_privs(snl, list_pw ? list_pw : sudo_user.pw);
485 /* Cleanup sudoers sources */
486 tq_foreach_fwd(snl, nss)
489 #ifdef USING_NONUNIX_GROUPS
490 /* Finished with the groupcheck code */
491 sudo_nonunix_groupcheck_cleanup();
494 /* Deferred exit due to sudo_ldap_close() */
495 if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST)))
498 /* Must audit before uid change. */
499 audit_success(NewArgv);
501 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
504 /* Convert /bin/sh -> -sh so shell knows it is a login shell */
505 if ((p = strrchr(NewArgv[0], '/')) == NULL)
510 #if defined(__linux__) || defined(_AIX)
511 /* Insert system-wide environment variables. */
512 read_env_file(_PATH_ENVIRONMENT, TRUE);
516 if (ISSET(sudo_mode, MODE_RUN)) {
517 /* Insert system-wide environment variables. */
519 read_env_file(def_env_file, FALSE);
521 /* Insert user-specified environment variables. */
522 insert_env_vars(sudo_user.env_vars);
525 /* Restore signal handlers before we exec. */
526 (void) sigaction(SIGINT, &saved_sa_int, NULL);
527 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
528 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
530 if (ISSET(sudo_mode, MODE_EDIT)) {
531 exit(sudo_edit(NewArgc, NewArgv, envp));
533 exit(run_command(safe_cmnd, NewArgv, env_get(), runas_pw->pw_uid,
536 } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
537 audit_failure(NewArgv, "No user or host");
538 log_denial(validated, 1);
543 * We'd like to not leak path info at all here, but that can
544 * *really* confuse the users. To really close the leak we'd
545 * have to say "not allowed to run foo" even when the problem
546 * is just "no foo in path" since the user can trivially set
547 * their path to just contain a single dir.
549 log_denial(validated,
550 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
551 if (cmnd_status == NOT_FOUND)
552 warningx("%s: command not found", user_cmnd);
553 else if (cmnd_status == NOT_FOUND_DOT)
554 warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
556 /* Just tell the user they are not allowed to run foo. */
557 log_denial(validated, 1);
559 audit_failure(NewArgv, "validation failure");
562 exit(0); /* not reached */
566 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
567 * load the ``interfaces'' array.
573 char *p, **ep, thost[MAXHOSTNAMELEN + 1];
576 /* Sanity check command from user. */
577 if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
578 errorx(1, "%s: File name too long", NewArgv[0]);
581 (void) tzset(); /* set the timezone if applicable */
582 #endif /* HAVE_TZSET */
584 /* Default value for cmnd and cwd, overridden later. */
585 if (user_cmnd == NULL)
586 user_cmnd = NewArgv[0];
587 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
590 * We avoid gethostbyname() if possible since we don't want
591 * sudo to block if DNS or NIS is hosed.
592 * "host" is the (possibly fully-qualified) hostname and
593 * "shost" is the unqualified form of the hostname.
595 nohostname = gethostname(thost, sizeof(thost));
597 user_host = user_shost = "localhost";
599 thost[sizeof(thost) - 1] = '\0';
600 user_host = estrdup(thost);
601 if ((p = strchr(user_host, '.'))) {
603 user_shost = estrdup(user_host);
606 user_shost = user_host;
610 if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO)) ||
611 (p = ttyname(STDERR_FILENO))) {
612 user_tty = user_ttypath = estrdup(p);
613 if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
614 user_tty += sizeof(_PATH_DEV) - 1;
616 user_tty = "unknown";
618 for (ep = envp; *ep; ep++) {
619 /* XXX - don't fill in if empty string */
622 if (strncmp("DISPLAY=", *ep, 8) == 0)
623 user_display = *ep + 8;
626 if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
627 user_ccname = *ep + 11;
630 if (strncmp("PATH=", *ep, 5) == 0)
634 if (strncmp("SHELL=", *ep, 6) == 0)
635 user_shell = *ep + 6;
636 else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
637 user_prompt = *ep + 12;
638 else if (strncmp("SUDO_USER=", *ep, 10) == 0)
639 prev_user = *ep + 10;
640 else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
641 user_askpass = *ep + 13;
647 * Get a local copy of the user's struct passwd with the shadow password
648 * if necessary. It is assumed that euid is 0 at this point so we
649 * can read the shadow passwd file if necessary.
651 if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
652 /* Need to make a fake struct passwd for logging to work. */
654 char pw_name[MAX_UID_T_LEN + 1];
656 pw.pw_uid = getuid();
657 (void) snprintf(pw_name, sizeof(pw_name), "%lu",
658 (unsigned long) pw.pw_uid);
659 pw.pw_name = pw_name;
663 * If we are in -k/-K mode, just spew to stderr. It is not unusual for
664 * users to place "sudo -k" in a .logout file which can cause sudo to
665 * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
667 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
668 errorx(1, "unknown uid: %s", pw_name);
669 log_error(0, "unknown uid: %s", pw_name);
671 #ifdef HAVE_MBR_CHECK_MEMBERSHIP
672 mbr_uid_to_uuid(user_uid, user_uuid);
674 if (user_shell == NULL || *user_shell == '\0')
675 user_shell = estrdup(sudo_user.pw->pw_shell);
677 /* It is now safe to use log_error() and set_perms() */
679 #ifdef HAVE_GETGROUPS
680 if ((user_ngroups = getgroups(0, NULL)) > 0) {
681 user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
682 if (getgroups(user_ngroups, user_groups) < 0)
683 log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
688 log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
691 * Get current working directory. Try as user, fall back to root.
693 set_perms(PERM_USER);
694 if (!getcwd(user_cwd, sizeof(user_cwd))) {
695 set_perms(PERM_ROOT);
696 if (!getcwd(user_cwd, sizeof(user_cwd))) {
697 warningx("cannot get working directory");
698 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
701 set_perms(PERM_ROOT);
704 * If we were given the '-e', '-i' or '-s' options we need to redo
705 * NewArgv and NewArgc.
707 if (ISSET(sudo_mode, MODE_EDIT)) {
710 NewArgv[0] = "sudoedit";
711 } else if (ISSET(sudo_mode, MODE_SHELL)) {
714 /* Allocate an extra slot for execve() failure (ENOEXEC). */
715 av = (char **) emalloc2(5, sizeof(char *));
718 av[0] = user_shell; /* may be updated later */
720 size_t cmnd_size = 1024;
721 char *cmnd, *src, *dst, **ap;
723 cmnd = dst = emalloc(cmnd_size);
724 for (ap = NewArgv; *ap != NULL; ap++) {
725 for (src = *ap; *src != '\0'; src++) {
726 /* reserve room for an escaped char + space */
727 if (cmnd_size < (dst - cmnd) + 3) {
730 new_cmnd = erealloc(cmnd, cmnd_size);
731 dst = new_cmnd + (dst - cmnd);
734 if (isalnum((unsigned char)*src) || *src == '_' || *src == '-') {
737 /* quote potential meta character */
745 dst--; /* replace last space with a NUL */
751 av[++NewArgc] = NULL;
757 * Fill in user_cmnd, user_args, user_base and user_stat variables
758 * and apply any command-specific defaults entries.
765 char *path = user_path;
767 /* Set project if applicable. */
768 set_project(runas_pw);
770 /* Resolve the path and return. */
772 user_stat = emalloc(sizeof(struct stat));
773 if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
774 if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
775 if (def_secure_path && !user_is_exempt())
776 path = def_secure_path;
777 set_perms(PERM_RUNAS);
778 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
780 set_perms(PERM_ROOT);
782 /* Failed as root, try as invoking user. */
783 set_perms(PERM_USER);
784 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
786 set_perms(PERM_ROOT);
795 /* If we didn't realloc NewArgv it is contiguous so just count. */
796 if (!ISSET(sudo_mode, MODE_SHELL)) {
797 size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
798 strlen(NewArgv[NewArgc-1]) + 1;
800 for (size = 0, from = NewArgv + 1; *from; from++)
801 size += strlen(*from) + 1;
804 /* Alloc and build up user_args. */
805 user_args = (char *) emalloc(size);
806 for (to = user_args, from = NewArgv + 1; *from; from++) {
807 n = strlcpy(to, *from, size - (to - user_args));
808 if (n >= size - (to - user_args))
809 errorx(1, "internal error, init_vars() overflow");
816 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
819 user_base = user_cmnd;
821 if (!update_defaults(SETDEF_CMND))
822 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
824 if (!runas_user && !runas_group)
825 set_runaspw(def_runas_default); /* may have been updated above */
831 * Setup the execution environment immediately prior to the call to execve()
832 * Returns TRUE on success and FALSE on failure.
835 exec_setup(rbac_enabled, ttyname, ttyfd)
844 if (selinux_setup(user_role, user_type, ttyname, ttyfd) == -1)
849 /* Close the password and group files and free up memory. */
854 * For sudoedit, the command runas a the user with no additional setup.
856 if (ISSET(sudo_mode, MODE_EDIT)) {
857 set_perms(PERM_FULL_USER);
863 * Set umask based on sudoers.
864 * If user's umask is more restrictive, OR in those bits too
865 * unless umask_override is set.
867 if (def_umask != 0777) {
868 if (def_umask_override) {
871 mode_t mask = umask(def_umask);
873 if (mask != def_umask)
878 /* Restore coredumpsize resource limit. */
879 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
880 (void) setrlimit(RLIMIT_CORE, &corelimit);
881 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
883 if (ISSET(sudo_mode, MODE_RUN))
884 set_perms(PERM_FULL_RUNAS);
886 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
887 /* Change to target user's homedir. */
888 if (chdir(runas_pw->pw_dir) == -1) {
889 warning("unable to change directory to %s", runas_pw->pw_dir);
895 * Restore nproc resource limit if pam_limits didn't do it for us.
896 * We must do this *after* the uid change to avoid potential EAGAIN
899 #if defined(__linux__)
902 if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
903 if (rl.rlim_cur == RLIM_INFINITY && rl.rlim_max == RLIM_INFINITY)
904 (void) setrlimit(RLIMIT_NPROC, &nproclimit);
916 * Run the command and wait for it to complete.
919 run_command(path, argv, envp, uid, dowait)
926 struct command_status cstat;
933 cstat.type = CMD_INVALID;
936 sudo_execve(path, argv, envp, uid, &cstat, dowait,
937 ISSET(sudo_mode, MODE_BACKGROUND));
939 switch (cstat.type) {
941 /* exec_setup() or execve() returned an error. */
942 warningx("unable to execute %s: %s", path, strerror(cstat.val));
946 /* Command ran, exited or was killed. */
947 if (WIFEXITED(cstat.val))
948 exitcode = WEXITSTATUS(cstat.val);
949 else if (WIFSIGNALED(cstat.val))
950 exitcode = WTERMSIG(cstat.val) | 128;
953 warningx("unexpected child termination condition: %d", cstat.type);
958 #endif /* HAVE_PAM */
959 #ifdef _PATH_SUDO_IO_LOGDIR
966 * Open sudoers and sanity check mode/owner/type.
967 * Returns a handle to the sudoers file or NULL on error.
970 open_sudoers(sudoers, doedit, keepopen)
980 * Fix the mode and group on sudoers file from old default.
981 * Only works if file system is readable/writable by root.
983 if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
984 SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
985 (statbuf.st_mode & 0007777) == 0400) {
987 if (chmod(sudoers, SUDOERS_MODE) == 0) {
988 warningx("fixed mode on %s", sudoers);
989 SET(statbuf.st_mode, SUDOERS_MODE);
990 if (statbuf.st_gid != SUDOERS_GID) {
991 if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
992 warningx("set group on %s", sudoers);
993 statbuf.st_gid = SUDOERS_GID;
995 warning("unable to set group on %s", sudoers);
998 warning("unable to fix mode on %s", sudoers);
1002 * Sanity checks on sudoers file. Must be done as sudoers
1003 * file owner. We already did a stat as root, so use that
1004 * data if we can't stat as sudoers file owner.
1006 set_perms(PERM_SUDOERS);
1008 if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
1009 log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
1010 else if (!S_ISREG(statbuf.st_mode))
1011 log_error(NO_EXIT, "%s is not a regular file", sudoers);
1012 else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
1013 log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
1014 (unsigned int) (statbuf.st_mode & 07777),
1015 (unsigned int) SUDOERS_MODE);
1016 else if (statbuf.st_uid != SUDOERS_UID)
1017 log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
1018 (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1019 else if (statbuf.st_gid != SUDOERS_GID)
1020 log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
1021 (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1022 else if ((fp = fopen(sudoers, "r")) == NULL)
1023 log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers);
1026 * Make sure we can actually read sudoers so we can present the
1027 * user with a reasonable error message (unlike the lexer).
1029 if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
1030 log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers);
1038 (void) fcntl(fileno(fp), F_SETFD, 1);
1041 set_perms(PERM_ROOT); /* change back to root */
1046 * Close all open files (except std*) and turn off core dumps.
1047 * Also sets the set_perms() pointer to the correct function.
1052 int miss[3], devnull = -1;
1053 #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1057 #if defined(__linux__)
1059 * Unlimit the number of processes since Linux's setuid() will
1060 * apply resource limits when changing uid and return EAGAIN if
1061 * nproc would be violated by the uid switch.
1063 (void) getrlimit(RLIMIT_NPROC, &nproclimit);
1064 rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1065 if (setrlimit(RLIMIT_NPROC, &rl)) {
1066 memcpy(&rl, &nproclimit, sizeof(struct rlimit));
1067 rl.rlim_cur = rl.rlim_max;
1068 (void)setrlimit(RLIMIT_NPROC, &rl);
1070 #endif /* __linux__ */
1071 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1073 * Turn off core dumps.
1075 (void) getrlimit(RLIMIT_CORE, &corelimit);
1076 memcpy(&rl, &corelimit, sizeof(struct rlimit));
1078 (void) setrlimit(RLIMIT_CORE, &rl);
1079 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1082 * stdin, stdout and stderr must be open; set them to /dev/null
1083 * if they are closed and close all other fds.
1085 miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1086 miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1087 miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1088 if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1089 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) == -1)
1090 error(1, "unable to open %s", _PATH_DEVNULL);
1091 if (miss[STDIN_FILENO] && dup2(devnull, STDIN_FILENO) == -1)
1093 if (miss[STDOUT_FILENO] && dup2(devnull, STDOUT_FILENO) == -1)
1095 if (miss[STDERR_FILENO] && dup2(devnull, STDERR_FILENO) == -1)
1097 if (devnull > STDERR_FILENO)
1102 #ifdef HAVE_LOGIN_CAP_H
1110 * Don't make it a fatal error if the user didn't specify the login
1111 * class themselves. We do this because if login.conf gets
1112 * corrupted we want the admin to be able to use sudo to fix it.
1115 errflags = NO_MAIL|MSG_ONLY;
1117 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1119 if (login_class && strcmp(login_class, "-") != 0) {
1120 if (user_uid != 0 &&
1121 strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1122 errorx(1, "only root can use -c %s", login_class);
1124 login_class = pw->pw_class;
1125 if (!login_class || !*login_class)
1127 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1130 lc = login_getclass(login_class);
1131 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1132 log_error(errflags, "unknown login class: %s", login_class);
1134 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1143 #endif /* HAVE_LOGIN_CAP_H */
1145 #ifdef HAVE_PROJECT_H
1150 int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1152 struct project proj;
1153 struct project *resultp = '\0';
1157 * Collect the default project for the user and settaskid
1160 if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1161 errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1164 case SETPROJ_ERR_TASK:
1165 if (errno == EAGAIN)
1166 log_error(errflags, "resource control limit has been reached");
1167 else if (errno == ESRCH)
1168 log_error(errflags, "user \"%s\" is not a member of "
1169 "project \"%s\"", pw->pw_name, resultp->pj_name);
1170 else if (errno == EACCES)
1171 log_error(errflags, "the invoking task is final");
1173 log_error(errflags, "could not join project \"%s\"",
1176 case SETPROJ_ERR_POOL:
1177 if (errno == EACCES)
1178 log_error(errflags, "no resource pool accepting "
1179 "default bindings exists for project \"%s\"",
1181 else if (errno == ESRCH)
1182 log_error(errflags, "specified resource pool does "
1183 "not exist for project \"%s\"", resultp->pj_name);
1185 log_error(errflags, "could not bind to default "
1186 "resource pool for project \"%s\"", resultp->pj_name);
1190 log_error(errflags, "setproject failed for project \"%s\"",
1193 log_error(errflags, "warning, resource control assignment "
1194 "failed for project \"%s\"", resultp->pj_name);
1199 log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1209 #endif /* HAVE_PROJECT_H */
1212 * Look up the fully qualified domain name and set user_host and user_shost.
1217 #ifdef HAVE_GETADDRINFO
1218 struct addrinfo *res0, hint;
1224 #ifdef HAVE_GETADDRINFO
1225 zero_bytes(&hint, sizeof(hint));
1226 hint.ai_family = PF_UNSPEC;
1227 hint.ai_flags = AI_CANONNAME;
1228 if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1230 if (!(hp = gethostbyname(user_host))) {
1232 log_error(MSG_ONLY|NO_EXIT,
1233 "unable to resolve host %s", user_host);
1235 if (user_shost != user_host)
1238 #ifdef HAVE_GETADDRINFO
1239 user_host = estrdup(res0->ai_canonname);
1242 user_host = estrdup(hp->h_name);
1245 if ((p = strchr(user_host, '.'))) {
1247 user_shost = estrdup(user_host);
1250 user_shost = user_host;
1255 * Get passwd entry for the user we are going to run commands as.
1256 * By default, this is "root". Updates runas_pw as a side effect.
1263 if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1264 runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1266 if ((runas_pw = sudo_getpwnam(user)) == NULL) {
1267 audit_failure(NewArgv, "unknown user: %s", user);
1268 log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
1274 * Get group entry for the group we are going to run commands as.
1275 * Updates runas_pw as a side effect.
1281 if (*group == '#') {
1282 if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1283 runas_gr = sudo_fakegrnam(group);
1285 if ((runas_gr = sudo_getgrnam(group)) == NULL)
1286 log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
1291 * Get passwd entry for the user we are going to authenticate as.
1292 * By default, this is the user invoking sudo. In the most common
1293 * case, this matches sudo_user.pw or runas_pw.
1295 static struct passwd *
1301 if ((pw = sudo_getpwuid(0)) == NULL)
1302 log_error(0, "unknown uid: 0");
1303 } else if (def_runaspw) {
1304 if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1305 log_error(0, "unknown user: %s", def_runas_default);
1306 } else if (def_targetpw) {
1307 if (runas_pw->pw_name == NULL)
1308 log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
1309 (unsigned long) runas_pw->pw_uid);
1318 * Cleanup hook for error()/errorx()
1324 struct sudo_nss *nss;
1328 tq_foreach_fwd(snl, nss)
1331 #ifdef USING_NONUNIX_GROUPS
1332 sudo_nonunix_groupcheck_cleanup();
1336 #ifdef _PATH_SUDO_IO_LOGDIR
1340 term_restore(STDIN_FILENO, 0);
1342 selinux_restore_tty();
1349 (void) printf("Sudo version %s\n", PACKAGE_VERSION);
1350 if (getuid() == 0) {
1352 (void) printf("Configure args: %s\n", CONFIGURE_ARGS);
1353 (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
1355 # ifdef _PATH_NSSWITCH_CONF
1356 (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
1358 (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
1359 (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
1361 dump_auth_methods();
1368 #ifdef USE_ADMIN_FLAG
1370 create_admin_success_flag()
1372 struct stat statbuf;
1373 char flagfile[PATH_MAX];
1376 /* Check whether the user is in the admin group. */
1377 if (!user_in_group(sudo_user.pw, "admin"))
1380 /* Build path to flag file. */
1381 n = snprintf(flagfile, sizeof(flagfile), "%s/.sudo_as_admin_successful",
1383 if (n <= 0 || n >= sizeof(flagfile))
1386 /* Create admin flag file if it doesn't already exist. */
1387 set_perms(PERM_USER);
1388 if (stat(flagfile, &statbuf) == 0) {
1389 set_perms(PERM_ROOT);
1393 fd = open(flagfile, O_CREAT|O_WRONLY|O_EXCL, 0644);
1395 set_perms(PERM_ROOT);
1397 #else /* !USE_ADMIN_FLAG */
1399 create_admin_success_flag()
1403 #endif /* USE_ADMIN_FLAG */