2 * Copyright (c) 1993-1996,1998-2004 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 */
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 "interfaces.h"
96 static const char rcsid[] = "$Sudo: sudo.c,v 1.370 2004/08/24 18:01:13 millert Exp $";
102 static int init_vars __P((int));
103 static int parse_args __P((int, char **));
104 static void check_sudoers __P((void));
105 static void initial_setup __P((void));
106 static void set_loginclass __P((struct passwd *));
107 static void usage __P((int));
108 static void usage_excl __P((int));
109 static struct passwd *get_authpw __P((void));
110 extern int sudo_edit __P((int, char **));
111 extern void list_matches __P((void));
112 extern char **rebuild_env __P((char **, int, int));
113 extern char **zero_env __P((char **));
114 extern struct passwd *sudo_getpwnam __P((const char *));
115 extern struct passwd *sudo_getpwuid __P((uid_t));
116 extern struct passwd *sudo_pwdup __P((const struct passwd *));
122 char **Argv, **NewArgv;
124 struct sudo_user sudo_user;
125 struct passwd *auth_pw;
127 struct interface *interfaces;
131 extern int errorlineno;
132 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
133 static struct rlimit corelimit;
134 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
135 #ifdef HAVE_LOGIN_CAP_H
137 #endif /* HAVE_LOGIN_CAP_H */
138 #ifdef HAVE_BSD_AUTH_H
140 #endif /* HAVE_BSD_AUTH_H */
141 sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp, saved_sa_chld;
142 void (*set_perms) __P((int));
146 main(argc, argv, envp)
158 extern int printmatches;
159 extern char **environ;
162 if ((Argc = argc) < 1)
165 /* Must be done as the first thing... */
166 #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
167 (void) set_auth_parameters(Argc, Argv);
168 # ifdef HAVE_INITPRIVS
171 #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
173 /* Zero out the environment. */
174 environ = zero_env(envp);
177 errx(1, "must be setuid root");
181 * Ignore keyboard-generated signals so the user cannot interrupt
182 * us at some point and avoid the logging.
183 * Install handler to wait for children when they exit.
185 sigemptyset(&sa.sa_mask);
186 sa.sa_flags = SA_RESTART;
187 sa.sa_handler = SIG_IGN;
188 (void) sigaction(SIGINT, &sa, &saved_sa_int);
189 (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
190 (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
191 sa.sa_handler = reapchild;
192 (void) sigaction(SIGCHLD, &sa, &saved_sa_chld);
195 * Turn off core dumps, close open files and setup set_perms().
200 /* Parse our arguments. */
201 sudo_mode = parse_args(Argc, Argv);
203 /* Setup defaults data structures. */
206 /* Load the list of local ip addresses and netmasks. */
210 if (ISSET(sudo_mode, MODE_SHELL))
212 else if (ISSET(sudo_mode, MODE_EDIT))
213 user_cmnd = "sudoedit";
217 (void) printf("Sudo version %s\n", version);
230 user_cmnd = "validate";
234 case MODE_INVALIDATE:
249 /* Must have a command to run... */
250 if (user_cmnd == NULL && NewArgc == 0)
253 cmnd_status = init_vars(sudo_mode);
256 validated = sudo_ldap_check(pwflag);
258 /* Skip reading /etc/sudoers if LDAP told us to */
259 if (def_ignore_local_sudoers); /* skips */
260 else if (ISSET(validated, VALIDATE_OK) && !printmatches); /* skips */
261 else if (ISSET(validated, VALIDATE_OK) && printmatches)
263 check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
265 /* User is found in LDAP and we want a list of all sudo commands the
266 * user can do, so consult sudoers but throw away result.
268 sudoers_lookup(pwflag);
273 check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
275 /* Validate the user but don't search for pseudo-commands. */
276 validated = sudoers_lookup(pwflag);
280 * If we are using set_perms_posix() and the stay_setuid flag was not set,
281 * set the real, effective and saved uids to 0 and use set_perms_nosuid()
282 * instead of set_perms_posix().
284 #if !defined(HAVE_SETRESUID) && !defined(HAVE_SETREUID) && \
285 !defined(NO_SAVED_IDS) && defined(_SC_SAVED_IDS) && defined(_SC_VERSION)
286 if (!def_stay_setuid && set_perms == set_perms_posix) {
291 set_perms = set_perms_nosuid;
296 * Look up the timestamp dir owner if one is specified.
298 if (def_timestampowner) {
301 if (*def_timestampowner == '#')
302 pw = getpwuid(atoi(def_timestampowner + 1));
304 pw = getpwnam(def_timestampowner);
306 log_error(0, "timestamp owner (%s): No such user",
308 timestamp_uid = pw->pw_uid;
311 /* This goes after the sudoers parse since we honor sudoers options. */
312 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
313 remove_timestamp((sudo_mode == MODE_KILL));
317 if (ISSET(validated, VALIDATE_ERROR))
318 log_error(0, "parse error in %s near line %d", _PATH_SUDOERS,
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 /* If given the -P option, set the "preserve_groups" flag. */
330 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
331 def_preserve_groups = TRUE;
333 /* If no command line args and "set_home" is not set, error out. */
334 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
337 /* May need to set $HOME to target user if we are running a command. */
338 if (ISSET(sudo_mode, MODE_RUN) && (def_always_set_home ||
339 (ISSET(sudo_mode, MODE_SHELL) && def_set_home)))
340 SET(sudo_mode, MODE_RESET_HOME);
342 /* Bail if a tty is required and we don't have one. */
343 if (def_requiretty) {
344 if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1)
345 log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
350 /* Fill in passwd struct based on user we are authenticating as. */
351 auth_pw = get_authpw();
353 /* Require a password if sudoers says so. */
354 if (!ISSET(validated, FLAG_NOPASS))
355 check_user(ISSET(validated, FLAG_CHECK_USER));
357 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
358 if (user_uid == 0 && prev_user != NULL && strcmp(prev_user, "root") != 0) {
361 if ((pw = sudo_getpwnam(prev_user)) != NULL) {
367 /* Build a new environment that avoids any nasty bits if we have a cmnd. */
368 if (ISSET(sudo_mode, MODE_RUN))
369 new_environ = rebuild_env(envp, sudo_mode, ISSET(validated, FLAG_NOEXEC));
373 if (ISSET(validated, VALIDATE_OK)) {
374 /* Finally tell the user if the command did not exist. */
375 if (cmnd_status == NOT_FOUND_DOT) {
376 warnx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
378 } else if (cmnd_status == NOT_FOUND) {
379 warnx("%s: command not found", user_cmnd);
383 log_auth(validated, 1);
384 if (sudo_mode == MODE_VALIDATE)
386 else if (sudo_mode == MODE_LIST) {
389 sudo_ldap_list_matches();
394 /* This *must* have been set if we got a match but... */
395 if (safe_cmnd == NULL) {
397 "internal error, safe_cmnd never got set for %s; %s",
399 "please report this error at http://courtesan.com/sudo/bugs/");
402 /* Override user's umask if configured to do so. */
403 if (def_umask != 0777)
404 (void) umask(def_umask);
406 /* Restore coredumpsize resource limit. */
407 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
408 (void) setrlimit(RLIMIT_CORE, &corelimit);
409 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
411 /* Become specified user or root if executing a command. */
412 if (ISSET(sudo_mode, MODE_RUN))
413 set_perms(PERM_FULL_RUNAS);
415 /* Close the password and group files */
419 /* Install the real environment. */
420 environ = new_environ;
422 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
425 /* Convert /bin/sh -> -sh so shell knows it is a login shell */
426 if ((p = strrchr(NewArgv[0], '/')) == NULL)
431 /* Change to target user's homedir. */
432 if (chdir(runas_pw->pw_dir) == -1)
433 warn("unable to change directory to %s", runas_pw->pw_dir);
436 if (ISSET(sudo_mode, MODE_EDIT))
437 exit(sudo_edit(NewArgc, NewArgv));
439 /* Restore signal handlers before we exec. */
440 (void) sigaction(SIGINT, &saved_sa_int, NULL);
441 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
442 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
443 (void) sigaction(SIGCHLD, &saved_sa_chld, NULL);
446 if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0)
449 EXECV(safe_cmnd, NewArgv); /* run the command */
452 #endif /* PROFILING */
454 * If we got here then the exec() failed...
456 warn("unable to execute %s", safe_cmnd);
458 } else if (ISSET(validated, FLAG_NO_USER) || (validated & FLAG_NO_HOST)) {
459 log_auth(validated, 1);
461 } else if (ISSET(validated, VALIDATE_NOT_OK)) {
464 * We'd like to not leak path info at all here, but that can
465 * *really* confuse the users. To really close the leak we'd
466 * have to say "not allowed to run foo" even when the problem
467 * is just "no foo in path" since the user can trivially set
468 * their path to just contain a single dir.
471 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
472 if (cmnd_status == NOT_FOUND)
473 warnx("%s: command not found", user_cmnd);
474 else if (cmnd_status == NOT_FOUND_DOT)
475 warnx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
477 /* Just tell the user they are not allowed to run foo. */
478 log_auth(validated, 1);
482 /* should never get here */
483 log_auth(validated, 1);
486 exit(0); /* not reached */
490 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
491 * load the ``interfaces'' array.
497 char *p, thost[MAXHOSTNAMELEN];
498 int nohostname, rval;
500 /* Sanity check command from user. */
501 if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
502 errx(1, "%s: File name too long", NewArgv[0]);
505 (void) tzset(); /* set the timezone if applicable */
506 #endif /* HAVE_TZSET */
508 /* Default value for cmnd and cwd, overridden later. */
509 if (user_cmnd == NULL)
510 user_cmnd = NewArgv[0];
511 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
514 * We avoid gethostbyname() if possible since we don't want
515 * sudo to block if DNS or NIS is hosed.
516 * "host" is the (possibly fully-qualified) hostname and
517 * "shost" is the unqualified form of the hostname.
519 nohostname = gethostname(thost, sizeof(thost));
521 user_host = user_shost = "localhost";
523 user_host = estrdup(thost);
525 /* Defer call to set_fqdn() until log_error() is safe. */
526 user_shost = user_host;
528 if ((p = strchr(user_host, '.'))) {
530 user_shost = estrdup(user_host);
533 user_shost = user_host;
538 if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO))) {
539 if (strncmp(p, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
540 p += sizeof(_PATH_DEV) - 1;
541 user_tty = estrdup(p);
543 user_tty = "unknown";
546 * Get a local copy of the user's struct passwd with the shadow password
547 * if necessary. It is assumed that euid is 0 at this point so we
548 * can read the shadow passwd file if necessary.
550 if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
551 /* Need to make a fake struct passwd for logging to work. */
553 char pw_name[MAX_UID_T_LEN + 1];
555 pw.pw_uid = getuid();
556 (void) snprintf(pw_name, sizeof(pw_name), "%lu",
557 (unsigned long) pw.pw_uid);
558 pw.pw_name = pw_name;
562 * If we are in -k/-K mode, just spew to stderr. It is not unusual for
563 * users to place "sudo -k" in a .logout file which can cause sudo to
564 * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
566 if (sudo_mode & (MODE_INVALIDATE|MODE_KILL))
567 errx(1, "uid %s does not exist in the passwd file!", pw_name);
568 log_error(0, "uid %s does not exist in the passwd file!", pw_name);
570 if (user_shell == NULL || *user_shell == '\0')
571 user_shell = sudo_user.pw->pw_shell;
573 /* It is now safe to use log_error() and set_perms() */
576 set_fqdn(); /* may call log_error() */
579 log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
581 set_runaspw(*user_runas); /* may call log_error() */
582 if (*user_runas[0] == '#' && runas_pw->pw_name && runas_pw->pw_name[0])
583 *user_runas = estrdup(runas_pw->pw_name);
586 * Get current working directory. Try as user, fall back to root.
588 set_perms(PERM_USER);
589 if (!getcwd(user_cwd, sizeof(user_cwd))) {
590 set_perms(PERM_ROOT);
591 if (!getcwd(user_cwd, sizeof(user_cwd))) {
592 warnx("cannot get working directory");
593 (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
596 set_perms(PERM_ROOT);
599 * If we were given the '-e', '-i' or '-s' options we need to redo
600 * NewArgv and NewArgc.
602 if ((sudo_mode & (MODE_SHELL | MODE_EDIT))) {
603 char **dst, **src = NewArgv;
605 NewArgv = (char **) emalloc2((++NewArgc + 1), sizeof(char *));
606 if (ISSET(sudo_mode, MODE_EDIT))
607 NewArgv[0] = "sudoedit";
608 else if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
609 NewArgv[0] = runas_pw->pw_shell;
610 else if (user_shell && *user_shell)
611 NewArgv[0] = user_shell;
613 errx(1, "unable to determine shell");
615 /* copy the args from NewArgv */
616 for (dst = NewArgv + 1; (*dst = *src) != NULL; ++src, ++dst)
620 /* Set login class if applicable. */
621 set_loginclass(sudo_user.pw);
623 /* Resolve the path and return. */
625 user_stat = emalloc(sizeof(struct stat));
626 if (sudo_mode & (MODE_RUN | MODE_EDIT)) {
627 if (ISSET(sudo_mode, MODE_RUN)) {
628 /* XXX - default_runas may be modified during parsing of sudoers */
629 set_perms(PERM_RUNAS);
630 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
631 set_perms(PERM_ROOT);
633 /* Failed as root, try as invoking user. */
634 set_perms(PERM_USER);
635 rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
636 set_perms(PERM_ROOT);
645 /* If we didn't realloc NewArgv it is contiguous so just count. */
646 if (!(sudo_mode & (MODE_SHELL | MODE_EDIT))) {
647 size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
648 strlen(NewArgv[NewArgc-1]) + 1;
650 for (size = 0, from = NewArgv + 1; *from; from++)
651 size += strlen(*from) + 1;
654 /* Alloc and build up user_args. */
655 user_args = (char *) emalloc(size);
656 for (to = user_args, from = NewArgv + 1; *from; from++) {
657 n = strlcpy(to, *from, size - (to - user_args));
658 if (n >= size - (to - user_args))
659 errx(1, "internal error, init_vars() overflow");
666 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
669 user_base = user_cmnd;
675 * Command line argument parsing, can't use getopt(3).
678 parse_args(argc, argv)
682 int rval = MODE_RUN; /* what mode is sudo to be run in? */
683 int excl = 0; /* exclusive arg, no others allowed */
688 /* First, check to see if we were invoked as "sudoedit". */
689 if (strcmp(getprogname(), "sudoedit") == 0) {
695 if (NewArgc == 0 && rval == MODE_RUN) { /* no options and no command */
696 SET(rval, (MODE_IMPLIED_SHELL | MODE_SHELL));
700 while (NewArgc > 0 && NewArgv[0][0] == '-') {
701 if (NewArgv[0][1] != '\0' && NewArgv[0][2] != '\0')
702 warnx("please use single character options");
704 switch (NewArgv[0][1]) {
706 /* Must have an associated prompt. */
707 if (NewArgv[1] == NULL)
710 user_prompt = NewArgv[1];
716 /* Must have an associated runas user. */
717 if (NewArgv[1] == NULL)
720 user_runas = &NewArgv[1];
725 #ifdef HAVE_BSD_AUTH_H
727 /* Must have an associated authentication style. */
728 if (NewArgv[1] == NULL)
731 login_style = NewArgv[1];
737 #ifdef HAVE_LOGIN_CAP_H
739 /* Must have an associated login class. */
740 if (NewArgv[1] == NULL)
743 login_class = NewArgv[1];
744 def_use_loginclass = TRUE;
751 SET(rval, MODE_BACKGROUND);
755 if (excl && excl != 'e')
760 rval = MODE_VALIDATE;
761 if (excl && excl != 'v')
766 SET(rval, (MODE_LOGIN_SHELL | MODE_SHELL));
767 def_env_reset = TRUE;
768 if (excl && excl != 'i')
773 rval = MODE_INVALIDATE;
774 if (excl && excl != 'k')
780 if (excl && excl != 'K')
785 rval = MODE_LISTDEFS;
786 if (excl && excl != 'L')
792 if (excl && excl != 'l')
798 if (excl && excl != 'V')
804 if (excl && excl != 'h')
809 SET(rval, MODE_SHELL);
810 if (excl && excl != 's')
815 SET(rval, MODE_RESET_HOME);
818 SET(rval, MODE_PRESERVE_GROUPS);
821 SET(tgetpass_flags, TGP_STDIN);
826 if (rval == MODE_RUN)
827 SET(rval, (MODE_IMPLIED_SHELL | MODE_SHELL));
830 warnx("'-' requires an argument");
833 warnx("illegal option `%s'", NewArgv[0]);
840 if ((NewArgc == 0 && (rval & MODE_EDIT)) ||
841 (NewArgc > 0 && !(rval & (MODE_RUN | MODE_EDIT))))
848 * Sanity check sudoers mode/owner/type.
849 * Leaves a file pointer to the sudoers file open in ``fp''.
859 * Fix the mode and group on sudoers file from old default.
860 * Only works if file system is readable/writable by root.
862 if ((rootstat = stat_sudoers(_PATH_SUDOERS, &statbuf)) == 0 &&
863 SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
864 (statbuf.st_mode & 0007777) == 0400) {
866 if (chmod(_PATH_SUDOERS, SUDOERS_MODE) == 0) {
867 warnx("fixed mode on %s", _PATH_SUDOERS);
868 SET(statbuf.st_mode, SUDOERS_MODE);
869 if (statbuf.st_gid != SUDOERS_GID) {
870 if (!chown(_PATH_SUDOERS,(uid_t) -1,SUDOERS_GID)) {
871 warnx("set group on %s", _PATH_SUDOERS);
872 statbuf.st_gid = SUDOERS_GID;
874 warn("unable to set group on %s", _PATH_SUDOERS);
877 warn("unable to fix mode on %s", _PATH_SUDOERS);
881 * Sanity checks on sudoers file. Must be done as sudoers
882 * file owner. We already did a stat as root, so use that
883 * data if we can't stat as sudoers file owner.
885 set_perms(PERM_SUDOERS);
887 if (rootstat != 0 && stat_sudoers(_PATH_SUDOERS, &statbuf) != 0)
888 log_error(USE_ERRNO, "can't stat %s", _PATH_SUDOERS);
889 else if (!S_ISREG(statbuf.st_mode))
890 log_error(0, "%s is not a regular file", _PATH_SUDOERS);
891 else if (statbuf.st_size == 0)
892 log_error(0, "%s is zero length", _PATH_SUDOERS);
893 else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
894 log_error(0, "%s is mode 0%o, should be 0%o", _PATH_SUDOERS,
895 (statbuf.st_mode & 07777), SUDOERS_MODE);
896 else if (statbuf.st_uid != SUDOERS_UID)
897 log_error(0, "%s is owned by uid %lu, should be %lu", _PATH_SUDOERS,
898 (unsigned long) statbuf.st_uid, SUDOERS_UID);
899 else if (statbuf.st_gid != SUDOERS_GID)
900 log_error(0, "%s is owned by gid %lu, should be %lu", _PATH_SUDOERS,
901 (unsigned long) statbuf.st_gid, SUDOERS_GID);
903 /* Solaris sometimes returns EAGAIN so try 10 times */
904 for (i = 0; i < 10 ; i++) {
906 if ((sudoers_fp = fopen(_PATH_SUDOERS, "r")) == NULL ||
907 fread(&c, sizeof(c), 1, sudoers_fp) != 1) {
909 if (errno != EAGAIN && errno != EWOULDBLOCK)
915 if (sudoers_fp == NULL)
916 log_error(USE_ERRNO, "can't open %s", _PATH_SUDOERS);
919 set_perms(PERM_ROOT); /* change back to root */
923 * Close all open files (except std*) and turn off core dumps.
924 * Also sets the set_perms() pointer to the correct function.
929 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
933 * Turn off core dumps.
935 (void) getrlimit(RLIMIT_CORE, &corelimit);
936 memcpy(&rl, &corelimit, sizeof(struct rlimit));
938 (void) setrlimit(RLIMIT_CORE, &rl);
939 #endif /* RLIMIT_CORE && !SUDO_DEVEL */
941 closefrom(STDERR_FILENO + 1);
944 * Make set_perms point to the correct function.
945 * If we are using setresuid() or setreuid() we only need to set this
946 * once. If we are using POSIX saved uids we will switch to
947 * set_perms_nosuid after sudoers has been parsed if the "stay_suid"
950 #if defined(HAVE_SETRESUID) || defined(HAVE_SETREUID)
951 set_perms = set_perms_suid;
953 # if !defined(NO_SAVED_IDS) && defined(_SC_SAVED_IDS) && defined(_SC_VERSION)
954 if (sysconf(_SC_SAVED_IDS) == 1 && sysconf(_SC_VERSION) >= 199009)
955 set_perms = set_perms_posix;
958 set_perms = set_perms_nosuid;
959 #endif /* HAVE_SETRESUID || HAVE_SETREUID */
962 #ifdef HAVE_LOGIN_CAP_H
970 * Don't make it a fatal error if the user didn't specify the login
971 * class themselves. We do this because if login.conf gets
972 * corrupted we want the admin to be able to use sudo to fix it.
975 errflags = NO_MAIL|MSG_ONLY;
977 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
979 if (login_class && strcmp(login_class, "-") != 0) {
980 if (strcmp(*user_runas, "root") != 0 && user_uid != 0)
981 errx(1, "only root can use -c %s", login_class);
983 login_class = pw->pw_class;
984 if (!login_class || !*login_class)
986 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
989 lc = login_getclass(login_class);
990 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
991 log_error(errflags, "unknown login class: %s", login_class);
993 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1002 #endif /* HAVE_LOGIN_CAP_H */
1005 * Look up the fully qualified domain name and set user_host and user_shost.
1013 if (!(hp = gethostbyname(user_host))) {
1014 log_error(MSG_ONLY|NO_EXIT,
1015 "unable to lookup %s via gethostbyname()", user_host);
1017 if (user_shost != user_host)
1020 user_host = estrdup(hp->h_name);
1022 if ((p = strchr(user_host, '.'))) {
1024 user_shost = estrdup(user_host);
1027 user_shost = user_host;
1032 * Get passwd entry for the user we are going to run commands as.
1033 * By default, this is "root". Updates runas_pw as a side effect.
1039 if (runas_pw != NULL) {
1040 if (user_runas != &def_runas_default)
1041 return(TRUE); /* don't override -u option */
1045 runas_pw = sudo_getpwuid(atoi(user + 1));
1046 if (runas_pw == NULL) {
1047 runas_pw = emalloc(sizeof(struct passwd));
1048 (void) memset((VOID *)runas_pw, 0, sizeof(struct passwd));
1049 runas_pw->pw_uid = atoi(user + 1);
1052 runas_pw = sudo_getpwnam(user);
1053 if (runas_pw == NULL)
1054 log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %s!", user);
1060 * Get passwd entry for the user we are going to authenticate as.
1061 * By default, this is the user invoking sudo. In the most common
1062 * case, this matches sudo_user.pw or runas_pw.
1064 static struct passwd *
1070 if (runas_pw->pw_uid == 0)
1072 else if ((pw = sudo_getpwuid(0)) == NULL)
1073 log_error(0, "uid 0 does not exist in the passwd file!");
1074 } else if (def_runaspw) {
1075 if (strcmp(def_runas_default, *user_runas) == 0)
1077 else if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1078 log_error(0, "user %s does not exist in the passwd file!",
1080 } else if (def_targetpw) {
1081 if (runas_pw->pw_name == NULL)
1082 log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %lu!",
1092 * Tell which options are mutually exclusive and exit.
1095 usage_excl(exit_val)
1098 warnx("Only one of the -e, -h, -k, -K, -l, -s, -v or -V options may be used");
1103 * Give usage message and exit.
1110 int linelen, linemax, ulen;
1111 static char *uvec[] = {
1113 #ifdef HAVE_BSD_AUTH_H
1116 #ifdef HAVE_LOGIN_CAP_H
1120 " [-u username|#uid]",
1121 " { -e file [...] | -i | -s | <command> }",
1126 * For sudoedit, replace the last entry in the usage vector.
1127 * For sudo, print the secondary usage.
1129 if (strcmp(getprogname(), "sudoedit") == 0) {
1130 /* Replace the last entry in the usage vector. */
1131 for (p = uvec; p[1] != NULL; p++)
1135 fprintf(stderr, "usage: %s -K | -L | -V | -h | -k | -l | -v\n",
1140 * Print the main usage and wrap lines as needed.
1141 * Assumes an 80-character wide terminal, which is kind of bogus...
1143 ulen = (int)strlen(getprogname()) + 7;
1145 linelen = linemax - ulen;
1146 printf("usage: %s", getprogname());
1147 for (p = uvec; *p != NULL; p++) {
1148 if (linelen == linemax || (linelen -= strlen(*p)) >= 0) {
1153 printf("\n%*s", ulen, "");