2 * Copyright (c) 1993-1996, 1998-2009 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>
34 #include <sys/param.h>
35 #include <sys/socket.h>
37 # include <sys/time.h>
38 # include <sys/resource.h>
48 #endif /* STDC_HEADERS */
50 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
55 # ifdef HAVE_STRINGS_H
58 #endif /* HAVE_STRING_H */
61 #endif /* HAVE_UNISTD_H */
67 #if TIME_WITH_SYS_TIME
73 #include <netinet/in.h>
75 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
78 # include <hpsecurity.h>
80 # include <sys/security.h>
83 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
84 #ifdef HAVE_LOGIN_CAP_H
85 # include <login_cap.h>
86 # ifndef LOGIN_DEFROOTCLASS
87 # define LOGIN_DEFROOTCLASS "daemon"
92 # include <sys/task.h>
95 # include <selinux/selinux.h>
98 #include <sudo_usage.h>
101 #include "interfaces.h"
103 #ifdef USING_NONUNIX_GROUPS
104 # include "nonunix.h"
110 static void init_vars __P((int, char **));
111 static int set_cmnd __P((int));
112 static int parse_args __P((int, char **));
113 static void initial_setup __P((void));
114 static void set_loginclass __P((struct passwd *));
115 static void set_project __P((struct passwd *));
116 static void set_runasgr __P((char *));
117 static void set_runaspw __P((char *));
118 static void show_version __P((void));
119 static void usage __P((int))
120 __attribute__((__noreturn__));
121 static void usage_excl __P((int))
122 __attribute__((__noreturn__));
123 static struct passwd *get_authpw __P((void));
124 extern int sudo_edit __P((int, char **, char **));
125 extern void rebuild_env __P((int, int));
126 void validate_env_vars __P((struct list_member *));
127 void insert_env_vars __P((struct list_member *));
133 char **Argv, **NewArgv;
135 static int user_closefrom = -1;
136 struct sudo_user sudo_user;
137 struct passwd *auth_pw, *list_pw;
138 struct interface *interfaces;
143 extern int errorlineno;
144 extern int parse_error;
145 extern char *errorfile;
146 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
147 static struct rlimit corelimit;
148 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
149 #ifdef HAVE_LOGIN_CAP_H
151 #endif /* HAVE_LOGIN_CAP_H */
152 #ifdef HAVE_BSD_AUTH_H
154 #endif /* HAVE_BSD_AUTH_H */
155 sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
156 static char *runas_user;
157 static char *runas_group;
158 static struct sudo_nss_list *snl;
165 main(argc, argv, envp)
170 int sources = 0, validated;
171 int fd, cmnd_status, sudo_mode, pwflag, rc = 0;
173 struct sudo_nss *nss;
174 #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
175 extern char *malloc_options;
176 malloc_options = "AFGJPR";
179 #ifdef HAVE_SETLOCALE
180 setlocale(LC_ALL, "");
184 if ((Argc = argc) < 1)
187 /* Must be done as the first thing... */
188 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
189 (void) set_auth_parameters(Argc, Argv);
190 # ifdef HAVE_INITPRIVS
193 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
196 errorx(1, "must be setuid root");
200 * Ignore keyboard-generated signals so the user cannot interrupt
201 * us at some point and avoid the logging.
202 * Install handler to wait for children when they exit.
204 zero_bytes(&sa, sizeof(sa));
205 sigemptyset(&sa.sa_mask);
206 sa.sa_flags = SA_RESTART;
207 sa.sa_handler = SIG_IGN;
208 (void) sigaction(SIGINT, &sa, &saved_sa_int);
209 (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
210 (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
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(sudo_mode, 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) {
288 log_error(0, "no valid sudoers sources found, quitting");
290 /* XXX - collect post-sudoers parse settings into a function */
293 * Set runas passwd/group entries based on command line or sudoers.
294 * Note that if runas_group was specified without runas_user we
295 * defer setting runas_pw so the match routines know to ignore it.
297 if (runas_group != NULL) {
298 set_runasgr(runas_group);
299 if (runas_user != NULL)
300 set_runaspw(runas_user);
302 set_runaspw(runas_user ? runas_user : def_runas_default);
304 if (!update_defaults(SETDEF_RUNAS))
305 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
307 /* Set login class if applicable. */
308 set_loginclass(sudo_user.pw);
310 /* Update initial shell now that runas is set. */
311 if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
312 NewArgv[0] = runas_pw->pw_shell;
314 /* This goes after sudoers is parsed since it may have timestamp options. */
315 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
316 remove_timestamp((sudo_mode == MODE_KILL));
321 /* Is root even allowed to run sudo? */
322 if (user_uid == 0 && !def_root_sudo) {
323 (void) fprintf(stderr,
324 "Sorry, %s has been configured to not allow root to run it.\n",
329 /* Check for -C overriding def_closefrom. */
330 if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
331 if (!def_closefrom_override)
332 errorx(1, "you are not permitted to use the -C option");
334 def_closefrom = user_closefrom;
337 cmnd_status = set_cmnd(sudo_mode);
339 #ifdef HAVE_SETLOCALE
340 if (!setlocale(LC_ALL, def_sudoers_locale)) {
341 warningx("unable to set locale to \"%s\", using \"C\"",
343 setlocale(LC_ALL, "C");
347 validated = FLAG_NO_USER | FLAG_NO_HOST;
348 tq_foreach_fwd(snl, nss) {
349 validated = nss->lookup(nss, validated, pwflag);
351 if (ISSET(validated, VALIDATE_OK)) {
352 /* Handle "= auth" in netsvc.conf */
353 if (nss->ret_if_found)
356 /* Handle [NOTFOUND=return] */
357 if (nss->ret_if_notfound)
362 #ifdef USING_NONUNIX_GROUPS
363 /* Finished with the groupcheck code */
364 sudo_nonunix_groupcheck_cleanup();
367 if (safe_cmnd == NULL)
368 safe_cmnd = estrdup(user_cmnd);
370 #ifdef HAVE_SETLOCALE
371 setlocale(LC_ALL, "");
374 /* If only a group was specified, set runas_pw based on invoking user. */
375 if (runas_pw == NULL)
376 set_runaspw(user_name);
379 * Look up the timestamp dir owner if one is specified.
381 if (def_timestampowner) {
384 if (*def_timestampowner == '#')
385 pw = sudo_getpwuid(atoi(def_timestampowner + 1));
387 pw = sudo_getpwnam(def_timestampowner);
389 log_error(0, "timestamp owner (%s): No such user",
391 timestamp_uid = pw->pw_uid;
394 /* If given the -P option, set the "preserve_groups" flag. */
395 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
396 def_preserve_groups = TRUE;
398 /* If no command line args and "set_home" is not set, error out. */
399 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
402 /* Bail if a tty is required and we don't have one. */
403 if (def_requiretty) {
404 if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
405 audit_failure(NewArgv, "no tty");
406 log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
411 /* Use askpass value from sudoers unless user specified their own. */
412 if (def_askpass && !user_askpass)
413 user_askpass = def_askpass;
415 /* User may have overridden environment resetting via the -E flag. */
416 if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv)
417 def_env_reset = FALSE;
419 /* Build a new environment that avoids any nasty bits. */
420 rebuild_env(sudo_mode, def_noexec);
422 /* Fill in passwd struct based on user we are authenticating as. */
423 auth_pw = get_authpw();
425 /* Require a password if sudoers says so. */
426 if (def_authenticate)
427 check_user(validated, sudo_mode);
429 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
430 /* XXX - causes confusion when root is not listed in sudoers */
431 if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
432 if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
435 if ((pw = sudo_getpwnam(prev_user)) != NULL)
440 if (ISSET(validated, VALIDATE_OK)) {
441 /* Finally tell the user if the command did not exist. */
442 if (cmnd_status == NOT_FOUND_DOT) {
443 audit_failure(NewArgv, "command in current directory");
444 errorx(1, "ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
445 } else if (cmnd_status == NOT_FOUND) {
446 audit_failure(NewArgv, "%s: command not found", user_cmnd);
447 errorx(1, "%s: command not found", user_cmnd);
450 /* If user specified env vars make sure sudoers allows it. */
451 if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
452 if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
454 "sorry, you are not allowed to preserve the environment");
456 validate_env_vars(sudo_user.env_vars);
459 log_allowed(validated);
460 if (ISSET(sudo_mode, MODE_CHECK))
461 rc = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
462 else if (ISSET(sudo_mode, MODE_LIST))
463 display_privs(snl, list_pw ? list_pw : sudo_user.pw);
465 /* Cleanup sudoers sources */
466 tq_foreach_fwd(snl, nss)
469 /* Deferred exit due to sudo_ldap_close() */
470 if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST)))
474 * Set umask based on sudoers.
475 * If user's umask is more restrictive, OR in those bits too
476 * unless umask_override is set.
478 if (def_umask != 0777) {
479 if (def_umask_override) {
482 mode_t mask = umask(def_umask);
484 if (mask != def_umask)
489 /* Restore coredumpsize resource limit. */
490 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
491 (void) setrlimit(RLIMIT_CORE, &corelimit);
492 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
494 /* Must audit before uid change. */
495 audit_success(NewArgv);
497 /* Become specified user or root if executing a command. */
498 if (ISSET(sudo_mode, MODE_RUN))
499 set_perms(PERM_FULL_RUNAS);
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 /* Change to target user's homedir. */
511 if (chdir(runas_pw->pw_dir) == -1)
512 warning("unable to change directory to %s", runas_pw->pw_dir);
514 #if defined(__linux__) || defined(_AIX)
515 /* Insert system-wide environment variables. */
516 read_env_file(_PATH_ENVIRONMENT, TRUE);
520 if (ISSET(sudo_mode, MODE_EDIT))
521 exit(sudo_edit(NewArgc, NewArgv, envp));
523 /* Insert system-wide environment variables. */
525 read_env_file(def_env_file, FALSE);
527 /* Insert user-specified environment variables. */
528 insert_env_vars(sudo_user.env_vars);
530 /* Restore signal handlers before we exec. */
531 (void) sigaction(SIGINT, &saved_sa_int, NULL);
532 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
533 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
535 /* Close the password and group files and free up memory. */
539 closefrom(def_closefrom);
542 if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0) {
543 syslog(LOG_AUTH|LOG_ERR, "fork");
547 if (is_selinux_enabled() > 0 && user_role != NULL)
548 selinux_exec(user_role, user_type, NewArgv,
549 ISSET(sudo_mode, MODE_LOGIN_SHELL));
551 execv(safe_cmnd, NewArgv);
555 #endif /* PROFILING */
557 * If we got here then execve() failed...
559 if (errno == ENOEXEC) {
560 NewArgv--; /* at least one extra slot... */
562 NewArgv[1] = safe_cmnd;
563 execv(_PATH_BSHELL, NewArgv);
565 warning("unable to execute %s", safe_cmnd);
567 } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
568 audit_failure(NewArgv, "No user or host");
569 log_denial(validated, 1);
574 * We'd like to not leak path info at all here, but that can
575 * *really* confuse the users. To really close the leak we'd
576 * have to say "not allowed to run foo" even when the problem
577 * is just "no foo in path" since the user can trivially set
578 * their path to just contain a single dir.
580 log_denial(validated,
581 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
582 if (cmnd_status == NOT_FOUND)
583 warningx("%s: command not found", user_cmnd);
584 else if (cmnd_status == NOT_FOUND_DOT)
585 warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
587 /* Just tell the user they are not allowed to run foo. */
588 log_denial(validated, 1);
590 audit_failure(NewArgv, "validation failure");
593 exit(0); /* not reached */
597 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
598 * load the ``interfaces'' array.
601 init_vars(sudo_mode, envp)
605 char *p, **ep, thost[MAXHOSTNAMELEN + 1];
608 /* Sanity check command from user. */
609 if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
610 errorx(1, "%s: File name too long", NewArgv[0]);
613 (void) tzset(); /* set the timezone if applicable */
614 #endif /* HAVE_TZSET */
616 /* Default value for cmnd and cwd, overridden later. */
617 if (user_cmnd == NULL)
618 user_cmnd = NewArgv[0];
619 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
622 * We avoid gethostbyname() if possible since we don't want
623 * sudo to block if DNS or NIS is hosed.
624 * "host" is the (possibly fully-qualified) hostname and
625 * "shost" is the unqualified form of the hostname.
627 nohostname = gethostname(thost, sizeof(thost));
629 user_host = user_shost = "localhost";
631 thost[sizeof(thost) - 1] = '\0';
632 user_host = estrdup(thost);
634 /* Defer call to set_fqdn() until log_error() is safe. */
635 user_shost = user_host;
637 if ((p = strchr(user_host, '.'))) {
639 user_shost = estrdup(user_host);
642 user_shost = user_host;
647 if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO)) ||
648 (p = ttyname(STDERR_FILENO))) {
649 user_tty = user_ttypath = estrdup(p);
650 if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
651 user_tty += sizeof(_PATH_DEV) - 1;
653 user_tty = "unknown";
655 for (ep = envp; *ep; ep++) {
656 /* XXX - don't fill in if empty string */
659 if (strncmp("DISPLAY=", *ep, 8) == 0)
660 user_display = *ep + 8;
663 if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
664 user_ccname = *ep + 11;
667 if (strncmp("PATH=", *ep, 5) == 0)
671 if (strncmp("SHELL=", *ep, 6) == 0)
672 user_shell = *ep + 6;
673 else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
674 user_prompt = *ep + 12;
675 else if (strncmp("SUDO_USER=", *ep, 10) == 0)
676 prev_user = *ep + 10;
677 else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
678 user_askpass = *ep + 13;
684 * Get a local copy of the user's struct passwd with the shadow password
685 * if necessary. It is assumed that euid is 0 at this point so we
686 * can read the shadow passwd file if necessary.
688 if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
689 /* Need to make a fake struct passwd for logging to work. */
691 char pw_name[MAX_UID_T_LEN + 1];
693 pw.pw_uid = getuid();
694 (void) snprintf(pw_name, sizeof(pw_name), "%lu",
695 (unsigned long) pw.pw_uid);
696 pw.pw_name = pw_name;
700 * If we are in -k/-K mode, just spew to stderr. It is not unusual for
701 * users to place "sudo -k" in a .logout file which can cause sudo to
702 * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
704 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
705 errorx(1, "unknown uid: %s", pw_name);
706 log_error(0, "unknown uid: %s", pw_name);
708 if (user_shell == NULL || *user_shell == '\0')
709 user_shell = estrdup(sudo_user.pw->pw_shell);
711 /* It is now safe to use log_error() and set_perms() */
713 #ifdef HAVE_GETGROUPS
714 if ((user_ngroups = getgroups(0, NULL)) > 0) {
715 user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
716 if (getgroups(user_ngroups, user_groups) < 0)
717 log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
723 set_fqdn(); /* may call log_error() */
726 log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
729 * Get current working directory. Try as user, fall back to root.
731 set_perms(PERM_USER);
732 if (!getcwd(user_cwd, sizeof(user_cwd))) {
733 set_perms(PERM_ROOT);
734 if (!getcwd(user_cwd, sizeof(user_cwd))) {
735 warningx("cannot get working directory");
736 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
739 set_perms(PERM_ROOT);
742 * If we were given the '-e', '-i' or '-s' options we need to redo
743 * NewArgv and NewArgc.
745 if (ISSET(sudo_mode, MODE_EDIT)) {
748 NewArgv[0] = "sudoedit";
749 } else if (ISSET(sudo_mode, MODE_SHELL)) {
752 /* Allocate an extra slot for execve() failure (ENOEXEC). */
753 av = (char **) emalloc2(5, sizeof(char *));
756 av[0] = user_shell; /* may be updated later */
759 char *cmnd, *src, *dst, *end;
760 size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[0]) +
761 strlen(NewArgv[NewArgc - 1]) + 1;
762 cmnd = emalloc(size);
765 for (end = src + size - 1; src < end; src++, dst++)
766 *dst = *src == 0 ? ' ' : *src;
772 av[++NewArgc] = NULL;
778 * Fill in user_cmnd, user_args, user_base and user_stat variables
779 * and apply any command-specific defaults entries.
787 /* Set project if applicable. */
788 set_project(runas_pw);
790 /* Resolve the path and return. */
792 user_stat = emalloc(sizeof(struct stat));
793 if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
794 if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
795 set_perms(PERM_RUNAS);
796 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
797 set_perms(PERM_ROOT);
799 /* Failed as root, try as invoking user. */
800 set_perms(PERM_USER);
801 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
802 set_perms(PERM_ROOT);
811 /* If we didn't realloc NewArgv it is contiguous so just count. */
812 if (!ISSET(sudo_mode, MODE_SHELL)) {
813 size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
814 strlen(NewArgv[NewArgc-1]) + 1;
816 for (size = 0, from = NewArgv + 1; *from; from++)
817 size += strlen(*from) + 1;
820 /* Alloc and build up user_args. */
821 user_args = (char *) emalloc(size);
822 for (to = user_args, from = NewArgv + 1; *from; from++) {
823 n = strlcpy(to, *from, size - (to - user_args));
824 if (n >= size - (to - user_args))
825 errorx(1, "internal error, init_vars() overflow");
832 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
835 user_base = user_cmnd;
837 if (!update_defaults(SETDEF_CMND))
838 log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
840 if (!runas_user && !runas_group)
841 set_runaspw(def_runas_default); /* may have been updated above */
847 * Command line argument parsing.
848 * Sets NewArgc and NewArgv which corresponds to the argc/argv we'll use
849 * for the command to be run (if we are running one).
852 parse_args(argc, argv)
856 int mode = 0; /* what mode is sudo to be run in? */
857 int flags = 0; /* mode flags */
860 /* First, check to see if we were invoked as "sudoedit". */
861 if (strcmp(getprogname(), "sudoedit") == 0)
864 /* Returns true if the last option string was "--" */
865 #define got_end_of_args (optind > 1 && argv[optind - 1][0] == '-' && \
866 argv[optind - 1][1] == '-' && argv[optind - 1][2] == '\0')
868 /* Returns true if next option is an environment variable */
869 #define is_envar (optind < argc && argv[optind][0] != '/' && \
870 strchr(argv[optind], '=') != NULL)
872 /* Flags allowed when running a command */
873 valid_flags = MODE_BACKGROUND|MODE_PRESERVE_ENV|MODE_RESET_HOME|
874 MODE_LOGIN_SHELL|MODE_INVALIDATE|MODE_NONINTERACTIVE|
875 MODE_PRESERVE_GROUPS|MODE_SHELL;
878 * We disable arg permutation for GNU getopt().
879 * Some trickiness is required to allow environment variables
880 * to be interspersed with command line options.
882 if ((ch = getopt(argc, argv, "+Aa:bC:c:Eeg:HhiKkLlnPp:r:Sst:U:u:Vv")) != -1) {
885 SET(tgetpass_flags, TGP_ASKPASS);
887 #ifdef HAVE_BSD_AUTH_H
889 login_style = optarg;
893 SET(flags, MODE_BACKGROUND);
896 if ((user_closefrom = atoi(optarg)) < 3) {
897 warningx("the argument to -C must be at least 3");
901 #ifdef HAVE_LOGIN_CAP_H
903 login_class = optarg;
904 def_use_loginclass = TRUE;
908 SET(flags, MODE_PRESERVE_ENV);
911 if (mode && mode != MODE_EDIT)
914 valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
917 runas_group = optarg;
920 SET(flags, MODE_RESET_HOME);
923 if (mode && mode != MODE_HELP) {
924 if (strcmp(getprogname(), "sudoedit") != 0)
931 SET(flags, MODE_LOGIN_SHELL);
932 def_env_reset = TRUE;
935 SET(flags, MODE_INVALIDATE);
938 if (mode && mode != MODE_KILL)
944 if (mode && mode != MODE_LISTDEFS)
946 mode = MODE_LISTDEFS;
947 valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
951 if (mode == MODE_LIST)
957 valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
960 SET(flags, MODE_NONINTERACTIVE);
963 SET(flags, MODE_PRESERVE_GROUPS);
966 user_prompt = optarg;
967 def_passprompt_override = TRUE;
978 SET(tgetpass_flags, TGP_STDIN);
981 SET(flags, MODE_SHELL);
984 if ((list_pw = sudo_getpwnam(optarg)) == NULL)
985 errorx(1, "unknown user: %s", optarg);
991 if (mode && mode != MODE_VALIDATE)
993 mode = MODE_VALIDATE;
994 valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
997 if (mode && mode != MODE_VERSION)
1005 } else if (!got_end_of_args && is_envar) {
1006 struct list_member *ev;
1008 /* Store environment variable. */
1009 ev = emalloc(sizeof(*ev));
1010 ev->value = argv[optind];
1011 ev->next = sudo_user.env_vars;
1012 sudo_user.env_vars = ev;
1014 /* Crank optind and resume getopt. */
1017 /* Not an option or an environment variable -- we're done. */
1022 NewArgc = argc - optind;
1023 NewArgv = argv + optind;
1026 /* Defer -k mode setting until we know whether it is a flag or not */
1027 if (ISSET(flags, MODE_INVALIDATE) && NewArgc == 0) {
1028 mode = MODE_INVALIDATE; /* -k by itself */
1029 CLR(flags, MODE_INVALIDATE);
1032 mode = MODE_RUN; /* running a command */
1036 if (NewArgc > 0 && mode == MODE_LIST)
1039 if (ISSET(flags, MODE_LOGIN_SHELL)) {
1040 if (ISSET(flags, MODE_SHELL)) {
1041 warningx("you may not specify both the `-i' and `-s' options");
1044 if (ISSET(flags, MODE_PRESERVE_ENV)) {
1045 warningx("you may not specify both the `-i' and `-E' options");
1048 SET(flags, MODE_SHELL);
1050 if ((flags & valid_flags) != flags)
1052 if (mode == MODE_EDIT &&
1053 (ISSET(flags, MODE_PRESERVE_ENV) || sudo_user.env_vars != NULL)) {
1054 if (ISSET(mode, MODE_PRESERVE_ENV))
1055 warningx("the `-E' option is not valid in edit mode");
1056 if (sudo_user.env_vars != NULL)
1057 warningx("you may not specify environment variables in edit mode");
1060 if ((runas_user != NULL || runas_group != NULL) &&
1061 !ISSET(mode, MODE_EDIT | MODE_RUN | MODE_CHECK)) {
1064 if (list_pw != NULL && mode != MODE_LIST && mode != MODE_CHECK) {
1065 warningx("the `-U' option may only be used with the `-l' option");
1068 if (ISSET(tgetpass_flags, TGP_STDIN) && ISSET(tgetpass_flags, TGP_ASKPASS)) {
1069 warningx("the `-A' and `-S' options may not be used together");
1072 if ((NewArgc == 0 && mode == MODE_EDIT) ||
1073 (NewArgc > 0 && !ISSET(mode, MODE_RUN | MODE_EDIT | MODE_CHECK)))
1075 if (NewArgc == 0 && mode == MODE_RUN && !ISSET(flags, MODE_SHELL))
1076 SET(flags, (MODE_IMPLIED_SHELL | MODE_SHELL));
1078 return(mode | flags);
1082 * Open sudoers and sanity check mode/owner/type.
1083 * Returns a handle to the sudoers file or NULL on error.
1086 open_sudoers(sudoers, doedit, keepopen)
1087 const char *sudoers;
1091 struct stat statbuf;
1096 * Fix the mode and group on sudoers file from old default.
1097 * Only works if file system is readable/writable by root.
1099 if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
1100 SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
1101 (statbuf.st_mode & 0007777) == 0400) {
1103 if (chmod(sudoers, SUDOERS_MODE) == 0) {
1104 warningx("fixed mode on %s", sudoers);
1105 SET(statbuf.st_mode, SUDOERS_MODE);
1106 if (statbuf.st_gid != SUDOERS_GID) {
1107 if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
1108 warningx("set group on %s", sudoers);
1109 statbuf.st_gid = SUDOERS_GID;
1111 warning("unable to set group on %s", sudoers);
1114 warning("unable to fix mode on %s", sudoers);
1118 * Sanity checks on sudoers file. Must be done as sudoers
1119 * file owner. We already did a stat as root, so use that
1120 * data if we can't stat as sudoers file owner.
1122 set_perms(PERM_SUDOERS);
1124 if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
1125 log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
1126 else if (!S_ISREG(statbuf.st_mode))
1127 log_error(NO_EXIT, "%s is not a regular file", sudoers);
1128 else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
1129 log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
1130 (unsigned int) (statbuf.st_mode & 07777),
1131 (unsigned int) SUDOERS_MODE);
1132 else if (statbuf.st_uid != SUDOERS_UID)
1133 log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
1134 (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1135 else if (statbuf.st_gid != SUDOERS_GID)
1136 log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
1137 (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1138 else if ((fp = fopen(sudoers, "r")) == NULL)
1139 log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers);
1142 * Make sure we can actually read sudoers so we can present the
1143 * user with a reasonable error message (unlike the lexer).
1145 if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
1146 log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers);
1154 (void) fcntl(fileno(fp), F_SETFD, 1);
1157 set_perms(PERM_ROOT); /* change back to root */
1162 * Close all open files (except std*) and turn off core dumps.
1163 * Also sets the set_perms() pointer to the correct function.
1168 int miss[3], devnull = -1;
1169 #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1173 #if defined(__linux__)
1175 * Unlimit the number of processes since Linux's setuid() will
1176 * apply resource limits when changing uid and return EAGAIN if
1177 * nproc would be violated by the uid switch.
1179 rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1180 if (setrlimit(RLIMIT_NPROC, &rl)) {
1181 if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
1182 rl.rlim_cur = rl.rlim_max;
1183 (void)setrlimit(RLIMIT_NPROC, &rl);
1186 #endif /* __linux__ */
1187 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1189 * Turn off core dumps.
1191 (void) getrlimit(RLIMIT_CORE, &corelimit);
1192 memcpy(&rl, &corelimit, sizeof(struct rlimit));
1194 (void) setrlimit(RLIMIT_CORE, &rl);
1195 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1198 * stdin, stdout and stderr must be open; set them to /dev/null
1199 * if they are closed and close all other fds.
1201 miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1202 miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1203 miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1204 if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1205 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
1206 if (miss[STDIN_FILENO])
1207 (void) dup2(devnull, STDIN_FILENO);
1208 if (miss[STDOUT_FILENO])
1209 (void) dup2(devnull, STDOUT_FILENO);
1210 if (miss[STDERR_FILENO])
1211 (void) dup2(devnull, STDERR_FILENO);
1212 if (devnull > STDERR_FILENO)
1218 #ifdef HAVE_LOGIN_CAP_H
1226 * Don't make it a fatal error if the user didn't specify the login
1227 * class themselves. We do this because if login.conf gets
1228 * corrupted we want the admin to be able to use sudo to fix it.
1231 errflags = NO_MAIL|MSG_ONLY;
1233 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1235 if (login_class && strcmp(login_class, "-") != 0) {
1236 if (user_uid != 0 &&
1237 strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1238 errorx(1, "only root can use -c %s", login_class);
1240 login_class = pw->pw_class;
1241 if (!login_class || !*login_class)
1243 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1246 lc = login_getclass(login_class);
1247 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1248 log_error(errflags, "unknown login class: %s", login_class);
1250 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1259 #endif /* HAVE_LOGIN_CAP_H */
1261 #ifdef HAVE_PROJECT_H
1266 int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1268 struct project proj;
1269 struct project *resultp = '\0';
1273 * Collect the default project for the user and settaskid
1276 if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1277 errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1280 case SETPROJ_ERR_TASK:
1281 if (errno == EAGAIN)
1282 log_error(errflags, "resource control limit has been reached");
1283 else if (errno == ESRCH)
1284 log_error(errflags, "user \"%s\" is not a member of "
1285 "project \"%s\"", pw->pw_name, resultp->pj_name);
1286 else if (errno == EACCES)
1287 log_error(errflags, "the invoking task is final");
1289 log_error(errflags, "could not join project \"%s\"",
1292 case SETPROJ_ERR_POOL:
1293 if (errno == EACCES)
1294 log_error(errflags, "no resource pool accepting "
1295 "default bindings exists for project \"%s\"",
1297 else if (errno == ESRCH)
1298 log_error(errflags, "specified resource pool does "
1299 "not exist for project \"%s\"", resultp->pj_name);
1301 log_error(errflags, "could not bind to default "
1302 "resource pool for project \"%s\"", resultp->pj_name);
1306 log_error(errflags, "setproject failed for project \"%s\"",
1309 log_error(errflags, "warning, resource control assignment "
1310 "failed for project \"%s\"", resultp->pj_name);
1315 log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1325 #endif /* HAVE_PROJECT_H */
1328 * Look up the fully qualified domain name and set user_host and user_shost.
1333 #ifdef HAVE_GETADDRINFO
1334 struct addrinfo *res0, hint;
1340 #ifdef HAVE_GETADDRINFO
1341 zero_bytes(&hint, sizeof(hint));
1342 hint.ai_family = PF_UNSPEC;
1343 hint.ai_flags = AI_CANONNAME;
1344 if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1346 if (!(hp = gethostbyname(user_host))) {
1348 log_error(MSG_ONLY|NO_EXIT,
1349 "unable to resolve host %s", user_host);
1351 if (user_shost != user_host)
1354 #ifdef HAVE_GETADDRINFO
1355 user_host = estrdup(res0->ai_canonname);
1358 user_host = estrdup(hp->h_name);
1361 if ((p = strchr(user_host, '.'))) {
1363 user_shost = estrdup(user_host);
1366 user_shost = user_host;
1371 * Get passwd entry for the user we are going to run commands as.
1372 * By default, this is "root". Updates runas_pw as a side effect.
1379 if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1380 runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1382 if ((runas_pw = sudo_getpwnam(user)) == NULL) {
1383 audit_failure(NewArgv, "unknown user: %s", user);
1384 log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
1390 * Get group entry for the group we are going to run commands as.
1391 * Updates runas_pw as a side effect.
1397 if (*group == '#') {
1398 if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1399 runas_gr = sudo_fakegrnam(group);
1401 if ((runas_gr = sudo_getgrnam(group)) == NULL)
1402 log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
1407 * Get passwd entry for the user we are going to authenticate as.
1408 * By default, this is the user invoking sudo. In the most common
1409 * case, this matches sudo_user.pw or runas_pw.
1411 static struct passwd *
1417 if ((pw = sudo_getpwuid(0)) == NULL)
1418 log_error(0, "unknown uid: 0");
1419 } else if (def_runaspw) {
1420 if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1421 log_error(0, "unknown user: %s", def_runas_default);
1422 } else if (def_targetpw) {
1423 if (runas_pw->pw_name == NULL)
1424 log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
1425 (unsigned long) runas_pw->pw_uid);
1434 * Cleanup hook for error()/errorx()
1440 struct sudo_nss *nss;
1444 tq_foreach_fwd(snl, nss)
1455 (void) printf("Sudo version %s\n", PACKAGE_VERSION);
1456 if (getuid() == 0) {
1458 (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
1460 # ifdef _PATH_NSSWITCH_CONF
1461 (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
1463 (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
1464 (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
1466 dump_auth_methods();
1474 * Tell which options are mutually exclusive and exit.
1477 usage_excl(exit_val)
1480 warningx("Only one of the -e, -h, -i, -K, -l, -s, -v or -V options may be specified");
1485 * Give usage message and exit.
1486 * The actual usage strings are in sudo_usage.h for configure substitution.
1497 * Use usage vectors appropriate to the progname.
1499 if (strcmp(getprogname(), "sudoedit") == 0) {
1500 uvec[0] = SUDO_USAGE5 + 3;
1503 uvec[0] = SUDO_USAGE1;
1504 uvec[1] = SUDO_USAGE2;
1505 uvec[2] = SUDO_USAGE3;
1506 uvec[3] = SUDO_USAGE4;
1507 uvec[4] = SUDO_USAGE5;
1512 * Print usage and wrap lines as needed, depending on the
1515 ulen = (int)strlen(getprogname()) + 8;
1516 lbuf_init(&lbuf, NULL, ulen, 0);
1517 for (i = 0; uvec[i] != NULL; i++) {
1518 lbuf_append(&lbuf, "usage: ", getprogname(), uvec[i], NULL);
1521 lbuf_destroy(&lbuf);