2 * Copyright (c) 1993-1996,1998-2007 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 */
65 # include "emul/err.h"
66 #endif /* HAVE_ERR_H */
72 #if TIME_WITH_SYS_TIME
78 #include <netinet/in.h>
80 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
83 # include <hpsecurity.h>
85 # include <sys/security.h>
88 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
89 #ifdef HAVE_LOGIN_CAP_H
90 # include <login_cap.h>
91 # ifndef LOGIN_DEFROOTCLASS
92 # define LOGIN_DEFROOTCLASS "daemon"
97 # include <sys/task.h>
100 # include <selinux/selinux.h>
104 #include "interfaces.h"
108 __unused __unused static const char rcsid[] = "$Sudo: sudo.c,v 1.369.2.41 2008/06/21 19:04:07 millert Exp $";
114 static int init_vars __P((int, char **));
115 static int parse_args __P((int, char **));
116 static void check_sudoers __P((void));
117 static void initial_setup __P((void));
118 static void set_loginclass __P((struct passwd *));
119 static void set_project __P((struct passwd *));
120 static void usage __P((int))
121 __attribute__((__noreturn__));
122 static void usage_excl __P((int))
123 __attribute__((__noreturn__));
124 static void usage_excl __P((int));
125 static struct passwd *get_authpw __P((void));
126 extern int sudo_edit __P((int, char **, char **));
127 extern void list_matches __P((void));
128 extern char **rebuild_env __P((char **, int, int));
129 extern void validate_env_vars __P((struct list_member *));
130 extern char **insert_env_vars __P((char **, struct list_member *));
131 extern struct passwd *sudo_getpwnam __P((const char *));
132 extern struct passwd *sudo_getpwuid __P((uid_t));
133 extern struct passwd *sudo_pwdup __P((const struct passwd *));
134 extern void runas_resetgroups __P((void));
140 char **Argv, **NewArgv;
142 struct sudo_user sudo_user;
143 struct passwd *auth_pw;
145 struct interface *interfaces;
149 extern int errorlineno;
150 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
151 static struct rlimit corelimit;
152 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
153 #ifdef HAVE_LOGIN_CAP_H
155 #endif /* HAVE_LOGIN_CAP_H */
156 #ifdef HAVE_BSD_AUTH_H
158 #endif /* HAVE_BSD_AUTH_H */
159 sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
163 main(argc, argv, envp)
174 extern int printmatches;
175 extern char **environ;
177 #ifdef HAVE_SETLOCALE
178 setlocale(LC_ALL, "");
182 if ((Argc = argc) < 1)
185 /* Must be done as the first thing... */
186 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
187 (void) set_auth_parameters(Argc, Argv);
188 # ifdef HAVE_INITPRIVS
191 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
194 errx(1, "must be setuid root");
198 * Ignore keyboard-generated signals so the user cannot interrupt
199 * us at some point and avoid the logging.
200 * Install handler to wait for children when they exit.
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);
210 * Turn off core dumps and close open files.
215 /* Parse our arguments. */
216 sudo_mode = parse_args(Argc, Argv);
218 /* Setup defaults data structures. */
221 /* Load the list of local ip addresses and netmasks. */
225 if (ISSET(sudo_mode, MODE_SHELL))
227 else if (ISSET(sudo_mode, MODE_EDIT))
228 user_cmnd = "sudoedit";
232 (void) printf("Sudo version %s\n", version);
235 (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
246 user_cmnd = "validate";
250 case MODE_INVALIDATE:
265 /* Must have a command to run... */
266 if (user_cmnd == NULL && NewArgc == 0)
269 cmnd_status = init_vars(sudo_mode, environ);
272 validated = sudo_ldap_check(pwflag);
274 /* Skip reading /etc/sudoers if LDAP told us to */
275 if (!def_ignore_local_sudoers) {
278 check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
280 /* Local sudoers file overrides LDAP if we have a match. */
281 v = sudoers_lookup(pwflag);
282 if (validated == VALIDATE_ERROR || ISSET(v, VALIDATE_OK))
286 check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
288 /* Validate the user but don't search for pseudo-commands. */
289 validated = sudoers_lookup(pwflag);
291 if (safe_cmnd == NULL)
292 safe_cmnd = estrdup(user_cmnd);
295 * Look up the timestamp dir owner if one is specified.
297 if (def_timestampowner) {
300 if (*def_timestampowner == '#')
301 pw = getpwuid(atoi(def_timestampowner + 1));
303 pw = getpwnam(def_timestampowner);
305 log_error(0, "timestamp owner (%s): No such user",
307 timestamp_uid = pw->pw_uid;
310 /* This goes after the sudoers parse since we honor sudoers options. */
311 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
312 remove_timestamp((sudo_mode == MODE_KILL));
316 if (ISSET(validated, VALIDATE_ERROR))
317 log_error(0, "parse error in %s near line %d", _PATH_SUDOERS,
320 /* Is root even allowed to run sudo? */
321 if (user_uid == 0 && !def_root_sudo) {
322 (void) fprintf(stderr,
323 "Sorry, %s has been configured to not allow root to run it.\n",
328 /* If given the -P option, set the "preserve_groups" flag. */
329 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
330 def_preserve_groups = TRUE;
332 /* If no command line args and "set_home" is not set, error out. */
333 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
336 /* Bail if a tty is required and we don't have one. */
337 if (def_requiretty) {
338 if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1)
339 log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
344 /* User may have overriden environment resetting via the -E flag. */
345 if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && ISSET(validated, FLAG_SETENV))
346 def_env_reset = FALSE;
348 /* Build a new environment that avoids any nasty bits. */
349 environ = rebuild_env(environ, sudo_mode, ISSET(validated, FLAG_NOEXEC));
351 /* Fill in passwd struct based on user we are authenticating as. */
352 auth_pw = get_authpw();
354 /* Require a password if sudoers says so. */
355 if (!ISSET(validated, FLAG_NOPASS))
356 check_user(validated);
358 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
359 if (user_uid == 0 && prev_user != NULL && strcmp(prev_user, "root") != 0) {
362 if ((pw = sudo_getpwnam(prev_user)) != NULL) {
368 if (ISSET(validated, VALIDATE_OK)) {
369 /* Finally tell the user if the command did not exist. */
370 if (cmnd_status == NOT_FOUND_DOT) {
371 warnx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
373 } else if (cmnd_status == NOT_FOUND) {
374 warnx("%s: command not found", user_cmnd);
378 /* If user specified env vars make sure sudoers allows it. */
379 if (ISSET(sudo_mode, MODE_RUN) && !ISSET(validated, FLAG_SETENV)) {
380 if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
382 "sorry, you are not allowed to preserve the environment");
384 validate_env_vars(sudo_user.env_vars);
387 log_auth(validated, 1);
388 if (sudo_mode == MODE_VALIDATE)
390 else if (sudo_mode == MODE_LIST) {
393 sudo_ldap_list_matches();
398 /* Override user's umask if configured to do so. */
399 if (def_umask != 0777)
400 (void) umask(def_umask);
402 /* Restore coredumpsize resource limit. */
403 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
404 (void) setrlimit(RLIMIT_CORE, &corelimit);
405 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
407 /* Become specified user or root if executing a command. */
408 if (ISSET(sudo_mode, MODE_RUN))
409 set_perms(PERM_FULL_RUNAS);
411 /* Close the password and group files */
415 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
418 /* Convert /bin/sh -> -sh so shell knows it is a login shell */
419 if ((p = strrchr(NewArgv[0], '/')) == NULL)
424 /* Change to target user's homedir. */
425 if (chdir(runas_pw->pw_dir) == -1)
426 warn("unable to change directory to %s", runas_pw->pw_dir);
429 if (ISSET(sudo_mode, MODE_EDIT))
430 exit(sudo_edit(NewArgc, NewArgv, envp));
432 /* Insert user-specified environment variables. */
433 environ = insert_env_vars(environ, sudo_user.env_vars);
435 /* Restore signal handlers before we exec. */
436 (void) sigaction(SIGINT, &saved_sa_int, NULL);
437 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
438 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
441 if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0)
445 if (is_selinux_enabled() > 0 && user_role != NULL)
446 selinux_exec(user_role, user_type, NewArgv, environ,
447 ISSET(sudo_mode, MODE_LOGIN_SHELL));
449 execve(safe_cmnd, NewArgv, environ);
453 #endif /* PROFILING */
455 * If we got here then the exec() failed...
457 if (errno == ENOEXEC) {
458 NewArgv--; /* at least one extra slot... */
460 NewArgv[1] = safe_cmnd;
461 execve(_PATH_BSHELL, NewArgv, environ);
463 warn("unable to execute %s", safe_cmnd);
465 } else if (ISSET(validated, FLAG_NO_USER) || (validated & FLAG_NO_HOST)) {
466 log_auth(validated, 1);
468 } else if (ISSET(validated, VALIDATE_NOT_OK)) {
471 * We'd like to not leak path info at all here, but that can
472 * *really* confuse the users. To really close the leak we'd
473 * have to say "not allowed to run foo" even when the problem
474 * is just "no foo in path" since the user can trivially set
475 * their path to just contain a single dir.
478 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
479 if (cmnd_status == NOT_FOUND)
480 warnx("%s: command not found", user_cmnd);
481 else if (cmnd_status == NOT_FOUND_DOT)
482 warnx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
484 /* Just tell the user they are not allowed to run foo. */
485 log_auth(validated, 1);
489 /* should never get here */
490 log_auth(validated, 1);
493 exit(0); /* not reached */
497 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
498 * load the ``interfaces'' array.
501 init_vars(sudo_mode, envp)
505 char *p, **ep, thost[MAXHOSTNAMELEN];
506 int nohostname, rval;
508 /* Sanity check command from user. */
509 if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
510 errx(1, "%s: File name too long", NewArgv[0]);
513 (void) tzset(); /* set the timezone if applicable */
514 #endif /* HAVE_TZSET */
516 /* Default value for cmnd and cwd, overridden later. */
517 if (user_cmnd == NULL)
518 user_cmnd = NewArgv[0];
519 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
522 * We avoid gethostbyname() if possible since we don't want
523 * sudo to block if DNS or NIS is hosed.
524 * "host" is the (possibly fully-qualified) hostname and
525 * "shost" is the unqualified form of the hostname.
527 sudo_user.host_fqdn_queried = FALSE;
528 nohostname = gethostname(thost, sizeof(thost));
530 user_host = user_shost = "localhost";
532 user_host = estrdup(thost);
534 /* Defer call to set_fqdn() until log_error() is safe. */
535 user_shost = user_host;
537 user_shost = user_host;
541 if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO))) {
542 user_tty = user_ttypath = estrdup(p);
543 if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
544 user_tty += sizeof(_PATH_DEV) - 1;
546 user_tty = "unknown";
548 for (ep = envp; *ep; ep++) {
551 if (strncmp("PATH=", *ep, 5) == 0)
555 if (strncmp("SHELL=", *ep, 6) == 0)
556 user_shell = *ep + 6;
557 else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
558 user_prompt = *ep + 12;
559 else if (strncmp("SUDO_USER=", *ep, 10) == 0)
560 prev_user = *ep + 10;
567 * Get a local copy of the user's struct passwd with the shadow password
568 * if necessary. It is assumed that euid is 0 at this point so we
569 * can read the shadow passwd file if necessary.
571 if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
572 /* Need to make a fake struct passwd for logging to work. */
574 char pw_name[MAX_UID_T_LEN + 1];
576 pw.pw_uid = getuid();
577 (void) snprintf(pw_name, sizeof(pw_name), "%lu",
578 (unsigned long) pw.pw_uid);
579 pw.pw_name = pw_name;
583 * If we are in -k/-K mode, just spew to stderr. It is not unusual for
584 * users to place "sudo -k" in a .logout file which can cause sudo to
585 * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
587 if (sudo_mode & (MODE_INVALIDATE|MODE_KILL))
588 errx(1, "uid %s does not exist in the passwd file!", pw_name);
589 log_error(0, "uid %s does not exist in the passwd file!", pw_name);
591 if (user_shell == NULL || *user_shell == '\0')
592 user_shell = sudo_user.pw->pw_shell;
594 /* It is now safe to use log_error() and set_perms() */
596 #ifdef HAVE_GETGROUPS
597 if ((user_ngroups = getgroups(0, NULL)) > 0) {
598 user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
599 if (getgroups(user_ngroups, user_groups) < 0)
600 log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
606 set_fqdn(); /* may call log_error() */
609 log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
611 set_runaspw(*user_runas); /* may call log_error() */
612 if (*user_runas[0] == '#' && runas_pw->pw_name && runas_pw->pw_name[0])
613 *user_runas = estrdup(runas_pw->pw_name);
616 * Get current working directory. Try as user, fall back to root.
618 set_perms(PERM_USER);
619 if (!getcwd(user_cwd, sizeof(user_cwd))) {
620 set_perms(PERM_ROOT);
621 if (!getcwd(user_cwd, sizeof(user_cwd))) {
622 warnx("cannot get working directory");
623 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
626 set_perms(PERM_ROOT);
629 * If we were given the '-e', '-i' or '-s' options we need to redo
630 * NewArgv and NewArgc.
632 if ((sudo_mode & (MODE_SHELL | MODE_EDIT))) {
633 char **dst, **src = NewArgv;
635 /* Allocate an extra slot for execve() failure (ENOEXEC). */
636 NewArgv = (char **) emalloc2((++NewArgc + 2), sizeof(char *));
638 if (ISSET(sudo_mode, MODE_EDIT))
639 NewArgv[0] = "sudoedit";
640 else if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
641 NewArgv[0] = runas_pw->pw_shell;
642 else if (user_shell && *user_shell)
643 NewArgv[0] = user_shell;
645 errx(1, "unable to determine shell");
647 /* copy the args from NewArgv */
648 for (dst = NewArgv + 1; (*dst = *src) != NULL; ++src, ++dst)
652 /* Set login class if applicable. */
653 set_loginclass(sudo_user.pw);
655 /* Set project if applicable. */
656 set_project(runas_pw);
658 /* Resolve the path and return. */
660 user_stat = emalloc(sizeof(struct stat));
661 if (sudo_mode & (MODE_RUN | MODE_EDIT)) {
662 if (ISSET(sudo_mode, MODE_RUN)) {
663 /* XXX - default_runas may be modified during parsing of sudoers */
664 set_perms(PERM_RUNAS);
665 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
666 set_perms(PERM_ROOT);
668 /* Failed as root, try as invoking user. */
669 set_perms(PERM_USER);
670 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
671 set_perms(PERM_ROOT);
680 /* If we didn't realloc NewArgv it is contiguous so just count. */
681 if (!(sudo_mode & (MODE_SHELL | MODE_EDIT))) {
682 size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
683 strlen(NewArgv[NewArgc-1]) + 1;
685 for (size = 0, from = NewArgv + 1; *from; from++)
686 size += strlen(*from) + 1;
689 /* Alloc and build up user_args. */
690 user_args = (char *) emalloc(size);
691 for (to = user_args, from = NewArgv + 1; *from; from++) {
692 n = strlcpy(to, *from, size - (to - user_args));
693 if (n >= size - (to - user_args))
694 errx(1, "internal error, init_vars() overflow");
701 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
704 user_base = user_cmnd;
710 * Command line argument parsing, can't use getopt(3).
713 parse_args(argc, argv)
717 int rval = MODE_RUN; /* what mode is sudo to be run in? */
718 int excl = 0; /* exclusive arg, no others allowed */
723 /* First, check to see if we were invoked as "sudoedit". */
724 if (strcmp(getprogname(), "sudoedit") == 0) {
730 while (NewArgc > 0) {
731 if (NewArgv[0][0] == '-') {
732 if (NewArgv[0][1] != '\0' && NewArgv[0][2] != '\0') {
733 warnx("please use single character options");
737 switch (NewArgv[0][1]) {
739 /* Must have an associated prompt. */
740 if (NewArgv[1] == NULL)
743 user_prompt = NewArgv[1];
744 def_passprompt_override = TRUE;
750 /* Must have an associated runas user. */
751 if (NewArgv[1] == NULL)
754 user_runas = &NewArgv[1];
759 #ifdef HAVE_BSD_AUTH_H
761 /* Must have an associated authentication style. */
762 if (NewArgv[1] == NULL)
765 login_style = NewArgv[1];
771 #ifdef HAVE_LOGIN_CAP_H
773 /* Must have an associated login class. */
774 if (NewArgv[1] == NULL)
777 login_class = NewArgv[1];
778 def_use_loginclass = TRUE;
785 SET(rval, MODE_BACKGROUND);
789 if (excl && excl != 'e')
794 rval = MODE_VALIDATE;
795 if (excl && excl != 'v')
800 SET(rval, (MODE_LOGIN_SHELL | MODE_SHELL));
801 def_env_reset = TRUE;
802 if (excl && excl != 'i')
807 rval = MODE_INVALIDATE;
808 if (excl && excl != 'k')
814 if (excl && excl != 'K')
819 rval = MODE_LISTDEFS;
820 if (excl && excl != 'L')
826 if (excl && excl != 'l')
832 if (excl && excl != 'V')
838 if (excl && excl != 'h')
843 SET(rval, MODE_SHELL);
844 if (excl && excl != 's')
849 SET(rval, MODE_RESET_HOME);
852 SET(rval, MODE_PRESERVE_GROUPS);
855 SET(tgetpass_flags, TGP_STDIN);
858 SET(rval, MODE_PRESERVE_ENV);
862 /* Must have an associated SELinux role. */
863 if (NewArgv[1] == NULL)
866 user_role = NewArgv[1];
872 /* Must have an associated SELinux type. */
873 if (NewArgv[1] == NULL)
876 user_type = NewArgv[1];
887 warnx("'-' requires an argument");
890 warnx("illegal option `%s'", NewArgv[0]);
893 } else if (NewArgv[0][0] != '/' && strchr(NewArgv[0], '=') != NULL) {
894 /* Could be an environment variable. */
895 struct list_member *ev;
896 ev = emalloc(sizeof(*ev));
897 ev->value = NewArgv[0];
898 ev->next = sudo_user.env_vars;
899 sudo_user.env_vars = ev;
909 if (ISSET(rval, MODE_EDIT) &&
910 (ISSET(rval, MODE_PRESERVE_ENV) || sudo_user.env_vars != NULL)) {
911 if (ISSET(rval, MODE_PRESERVE_ENV))
912 warnx("the `-E' option is not valid in edit mode");
913 if (sudo_user.env_vars != NULL)
914 warnx("you may not specify environment variables in edit mode");
917 if (ISSET(rval, MODE_PRESERVE_ENV) && ISSET(rval, MODE_LOGIN_SHELL)) {
918 warnx("you may not specify both the `-i' and `-E' options");
921 if (user_runas != NULL && !ISSET(rval, (MODE_EDIT|MODE_RUN))) {
923 warnx("the `-u' and '-%c' options may not be used together", excl);
926 if ((NewArgc == 0 && (rval & MODE_EDIT)) ||
927 (NewArgc > 0 && !(rval & (MODE_RUN | MODE_EDIT))))
929 if (NewArgc == 0 && rval == MODE_RUN)
930 SET(rval, (MODE_IMPLIED_SHELL | MODE_SHELL));
936 * Sanity check sudoers mode/owner/type.
937 * Leaves a file pointer to the sudoers file open in ``fp''.
946 * Fix the mode and group on sudoers file from old default.
947 * Only works if file system is readable/writable by root.
949 if ((rootstat = stat_sudoers(_PATH_SUDOERS, &statbuf)) == 0 &&
950 SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
951 (statbuf.st_mode & 0007777) == 0400) {
953 if (chmod(_PATH_SUDOERS, SUDOERS_MODE) == 0) {
954 warnx("fixed mode on %s", _PATH_SUDOERS);
955 SET(statbuf.st_mode, SUDOERS_MODE);
956 if (statbuf.st_gid != SUDOERS_GID) {
957 if (!chown(_PATH_SUDOERS,(uid_t) -1,SUDOERS_GID)) {
958 warnx("set group on %s", _PATH_SUDOERS);
959 statbuf.st_gid = SUDOERS_GID;
961 warn("unable to set group on %s", _PATH_SUDOERS);
964 warn("unable to fix mode on %s", _PATH_SUDOERS);
968 * Sanity checks on sudoers file. Must be done as sudoers
969 * file owner. We already did a stat as root, so use that
970 * data if we can't stat as sudoers file owner.
972 set_perms(PERM_SUDOERS);
974 if (rootstat != 0 && stat_sudoers(_PATH_SUDOERS, &statbuf) != 0)
975 log_error(USE_ERRNO, "can't stat %s", _PATH_SUDOERS);
976 else if (!S_ISREG(statbuf.st_mode))
977 log_error(0, "%s is not a regular file", _PATH_SUDOERS);
978 else if (statbuf.st_size == 0)
979 log_error(0, "%s is zero length", _PATH_SUDOERS);
980 else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
981 log_error(0, "%s is mode 0%o, should be 0%o", _PATH_SUDOERS,
982 (unsigned int) (statbuf.st_mode & 07777),
983 (unsigned int) SUDOERS_MODE);
984 else if (statbuf.st_uid != SUDOERS_UID)
985 log_error(0, "%s is owned by uid %lu, should be %lu", _PATH_SUDOERS,
986 (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
987 else if (statbuf.st_gid != SUDOERS_GID)
988 log_error(0, "%s is owned by gid %lu, should be %lu", _PATH_SUDOERS,
989 (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
991 /* Solaris sometimes returns EAGAIN so try 10 times */
992 for (i = 0; i < 10 ; i++) {
994 if ((sudoers_fp = fopen(_PATH_SUDOERS, "r")) == NULL ||
995 fgetc(sudoers_fp) == EOF) {
996 if (sudoers_fp != NULL)
999 if (errno != EAGAIN && errno != EWOULDBLOCK)
1005 if (sudoers_fp == NULL)
1006 log_error(USE_ERRNO, "can't open %s", _PATH_SUDOERS);
1009 set_perms(PERM_ROOT); /* change back to root */
1013 * Close all open files (except std*) and turn off core dumps.
1018 int miss[3], devnull = -1;
1019 #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1023 #if defined(__linux__)
1025 * Unlimit the number of processes since Linux's setuid() will
1026 * apply resource limits when changing uid and return EAGAIN if
1027 * nproc would be violated by the uid switch.
1029 rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1030 if (setrlimit(RLIMIT_NPROC, &rl)) {
1031 if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
1032 rl.rlim_cur = rl.rlim_max;
1033 (void)setrlimit(RLIMIT_NPROC, &rl);
1036 #endif /* __linux__ */
1037 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1039 * Turn off core dumps.
1041 (void) getrlimit(RLIMIT_CORE, &corelimit);
1042 memcpy(&rl, &corelimit, sizeof(struct rlimit));
1044 (void) setrlimit(RLIMIT_CORE, &rl);
1045 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1048 * stdin, stdout and stderr must be open; set them to /dev/null
1049 * if they are closed and close all other fds.
1051 miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1052 miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1053 miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1054 if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1055 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
1056 if (miss[STDIN_FILENO])
1057 (void) dup2(devnull, STDIN_FILENO);
1058 if (miss[STDOUT_FILENO])
1059 (void) dup2(devnull, STDOUT_FILENO);
1060 if (miss[STDERR_FILENO])
1061 (void) dup2(devnull, STDERR_FILENO);
1064 closefrom(STDERR_FILENO + 1);
1067 #ifdef HAVE_LOGIN_CAP_H
1075 * Don't make it a fatal error if the user didn't specify the login
1076 * class themselves. We do this because if login.conf gets
1077 * corrupted we want the admin to be able to use sudo to fix it.
1080 errflags = NO_MAIL|MSG_ONLY;
1082 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1084 if (login_class && strcmp(login_class, "-") != 0) {
1085 if (strcmp(*user_runas, "root") != 0 && user_uid != 0)
1086 errx(1, "only root can use -c %s", login_class);
1088 login_class = pw->pw_class;
1089 if (!login_class || !*login_class)
1091 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1094 lc = login_getclass(login_class);
1095 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1096 log_error(errflags, "unknown login class: %s", login_class);
1098 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1107 #endif /* HAVE_LOGIN_CAP_H */
1109 #ifdef HAVE_PROJECT_H
1114 int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1116 struct project proj;
1117 struct project *resultp = '\0';
1121 * Collect the default project for the user and settaskid
1124 if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1125 errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1128 case SETPROJ_ERR_TASK:
1129 if (errno == EAGAIN)
1130 log_error(errflags, "resource control limit has been reached");
1131 else if (errno == ESRCH)
1132 log_error(errflags, "user \"%s\" is not a member of "
1133 "project \"%s\"", pw->pw_name, resultp->pj_name);
1134 else if (errno == EACCES)
1135 log_error(errflags, "the invoking task is final");
1137 log_error(errflags, "could not join project \"%s\"",
1140 case SETPROJ_ERR_POOL:
1141 if (errno == EACCES)
1142 log_error(errflags, "no resource pool accepting "
1143 "default bindings exists for project \"%s\"",
1145 else if (errno == ESRCH)
1146 log_error(errflags, "specified resource pool does "
1147 "not exist for project \"%s\"", resultp->pj_name);
1149 log_error(errflags, "could not bind to default "
1150 "resource pool for project \"%s\"", resultp->pj_name);
1154 log_error(errflags, "setproject failed for project \"%s\"",
1157 log_error(errflags, "warning, resource control assignment "
1158 "failed for project \"%s\"", resultp->pj_name);
1163 log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1173 #endif /* HAVE_PROJECT_H */
1176 * Look up the fully qualified domain name and set user_host and user_shost.
1181 #ifdef HAVE_GETADDRINFO
1182 struct addrinfo *res0, hint;
1188 #ifdef HAVE_GETADDRINFO
1189 memset(&hint, 0, sizeof(hint));
1190 hint.ai_family = PF_UNSPEC;
1191 hint.ai_flags = AI_CANONNAME;
1192 if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1194 if (!(hp = gethostbyname(user_host))) {
1196 log_error(MSG_ONLY|NO_EXIT,
1197 "unable to resolve host %s", user_host);
1199 if (user_shost != user_host)
1202 #ifdef HAVE_GETADDRINFO
1203 user_host = estrdup(res0->ai_canonname);
1206 user_host = estrdup(hp->h_name);
1209 if ((p = strchr(user_host, '.'))) {
1211 user_shost = estrdup(user_host);
1214 user_shost = user_host;
1216 sudo_user.host_fqdn_queried = TRUE;
1220 * Get passwd entry for the user we are going to run commands as.
1221 * By default, this is "root". Updates runas_pw as a side effect.
1227 if (runas_pw != NULL) {
1228 if (user_runas != &def_runas_default)
1229 return(TRUE); /* don't override -u option */
1233 runas_pw = sudo_getpwuid(atoi(user + 1));
1234 if (runas_pw == NULL) {
1235 runas_pw = emalloc(sizeof(struct passwd));
1236 (void) memset((VOID *)runas_pw, 0, sizeof(struct passwd));
1237 runas_pw->pw_uid = atoi(user + 1);
1240 runas_pw = sudo_getpwnam(user);
1241 if (runas_pw == NULL)
1242 log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %s!", user);
1244 runas_resetgroups();
1249 * Get passwd entry for the user we are going to authenticate as.
1250 * By default, this is the user invoking sudo. In the most common
1251 * case, this matches sudo_user.pw or runas_pw.
1253 static struct passwd *
1259 if (runas_pw->pw_uid == 0)
1261 else if ((pw = sudo_getpwuid(0)) == NULL)
1262 log_error(0, "uid 0 does not exist in the passwd file!");
1263 } else if (def_runaspw) {
1264 if (strcmp(def_runas_default, *user_runas) == 0)
1266 else if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1267 log_error(0, "user %s does not exist in the passwd file!",
1269 } else if (def_targetpw) {
1270 if (runas_pw->pw_name == NULL)
1271 log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %lu!",
1272 (unsigned long) runas_pw->pw_uid);
1281 * Tell which options are mutually exclusive and exit.
1284 usage_excl(exit_val)
1287 warnx("Only one of the -e, -h, i, -k, -K, -l, -s, -v or -V options may be used");
1292 * Give usage message and exit.
1298 char **p, **uvec[4];
1299 int i, linelen, linemax, ulen, plen;
1300 static char *uvec1[] = {
1310 static char *uvec2[] = {
1312 #ifdef HAVE_BSD_AUTH_H
1315 #ifdef HAVE_LOGIN_CAP_H
1325 " [-u username|#uid]",
1327 " {-i | -s | <command>}",
1330 static char *uvec3[] = {
1333 #ifdef HAVE_BSD_AUTH_H
1336 #ifdef HAVE_LOGIN_CAP_H
1340 " [-u username|#uid]",
1346 * Use usage vectors appropriate to the progname.
1348 if (strcmp(getprogname(), "sudoedit") == 0) {
1349 uvec[0] = uvec3 + 1;
1359 * Print usage and wrap lines as needed.
1360 * Assumes an 80-character wide terminal, which is kind of bogus...
1362 ulen = (int)strlen(getprogname()) + 7;
1364 for (i = 0; uvec[i] != NULL; i++) {
1365 printf("usage: %s", getprogname());
1366 linelen = linemax - ulen;
1367 for (p = uvec[i]; *p != NULL; p++) {
1368 plen = (int)strlen(*p);
1369 if (linelen >= plen || linelen == linemax - ulen) {
1374 linelen = linemax - ulen;
1375 printf("\n%*s", ulen, "");