2 * Copyright (c) 1993-1996, 1998-2011 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>
44 #endif /* STDC_HEADERS */
46 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
50 #endif /* HAVE_STRING_H */
53 #endif /* HAVE_STRINGS_H */
56 #endif /* HAVE_UNISTD_H */
66 #include <netinet/in.h>
68 #ifdef HAVE_LOGIN_CAP_H
69 # include <login_cap.h>
70 # ifndef LOGIN_DEFROOTCLASS
71 # define LOGIN_DEFROOTCLASS "daemon"
75 # include <selinux/selinux.h>
81 #include "interfaces.h"
82 #include "sudoers_version.h"
83 #include "auth/sudo_auth.h"
88 static void init_vars(char * const *);
89 static int set_cmnd(void);
90 static void set_loginclass(struct passwd *);
91 static void set_runaspw(const char *);
92 static void set_runasgr(const char *);
93 static int cb_runas_default(const char *);
94 static int sudoers_policy_version(int verbose);
95 static int deserialize_info(char * const settings[], char * const user_info[]);
96 static char *find_editor(int nfiles, char **files, char ***argv_out);
97 static void create_admin_success_flag(void);
102 const char *sudoers_file = _PATH_SUDOERS;
103 mode_t sudoers_mode = SUDOERS_MODE;
104 uid_t sudoers_uid = SUDOERS_UID;
105 gid_t sudoers_gid = SUDOERS_GID;
106 struct sudo_user sudo_user;
107 struct passwd *list_pw;
108 struct interface *interfaces;
112 extern int errorlineno;
113 extern int parse_error;
114 extern char *errorfile;
115 #ifdef HAVE_LOGIN_CAP_H
117 #endif /* HAVE_LOGIN_CAP_H */
118 #ifdef HAVE_BSD_AUTH_H
120 #endif /* HAVE_BSD_AUTH_H */
121 sudo_conv_t sudo_conv;
122 sudo_printf_t sudo_printf;
125 static char *prev_user;
126 static char *runas_user;
127 static char *runas_group;
128 static struct sudo_nss_list *snl;
129 static const char *interfaces_string;
130 static sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
132 /* XXX - must be extern for audit bits of sudo_auth.c */
137 extern sigjmp_buf error_jmp;
140 sudoers_policy_open(unsigned int version, sudo_conv_t conversation,
141 sudo_printf_t plugin_printf, char * const settings[],
142 char * const user_info[], char * const envp[])
144 volatile int sources = 0;
146 struct sudo_nss *nss;
149 sudo_conv = conversation;
151 sudo_printf = plugin_printf;
153 if (sigsetjmp(error_jmp, 1)) {
154 /* called via error(), errorx() or log_error() */
159 bindtextdomain("sudoers", LOCALEDIR);
163 * Ignore keyboard-generated signals so the user cannot interrupt
164 * us at some point and avoid the logging.
165 * Install handler to wait for children when they exit.
167 zero_bytes(&sa, sizeof(sa));
168 sigemptyset(&sa.sa_mask);
169 sa.sa_flags = SA_RESTART;
170 sa.sa_handler = SIG_IGN;
171 (void) sigaction(SIGINT, &sa, &saved_sa_int);
172 (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
173 (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
178 /* Initialize environment functions (including replacements). */
181 /* Setup defaults data structures. */
184 /* Parse settings and user_info */
185 sudo_mode = deserialize_info(settings, user_info);
187 init_vars(envp); /* XXX - move this later? */
189 /* Parse nsswitch.conf for sudoers order. */
190 snl = sudo_read_nss();
192 /* LDAP or NSS may modify the euid so we need to be root for the open. */
193 set_perms(PERM_INITIAL);
194 set_perms(PERM_ROOT);
196 /* Open and parse sudoers, set global defaults */
197 tq_foreach_fwd(snl, nss) {
198 if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
200 if (nss->setdefs(nss) != 0)
201 log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
205 warningx(_("no valid sudoers sources found, quitting"));
209 /* XXX - collect post-sudoers parse settings into a function */
212 * Initialize external group plugin, if any.
214 if (def_group_plugin) {
215 if (group_plugin_load(def_group_plugin) != TRUE)
216 def_group_plugin = NULL;
220 * Set runas passwd/group entries based on command line or sudoers.
221 * Note that if runas_group was specified without runas_user we
222 * defer setting runas_pw so the match routines know to ignore it.
224 if (runas_group != NULL) {
225 set_runasgr(runas_group);
226 if (runas_user != NULL)
227 set_runaspw(runas_user);
229 set_runaspw(runas_user ? runas_user : def_runas_default);
231 if (!update_defaults(SETDEF_RUNAS))
232 log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
235 set_fqdn(); /* deferred until after sudoers is parsed */
237 /* Set login class if applicable. */
238 set_loginclass(sudo_user.pw);
246 sudoers_policy_close(int exit_status, int error_code)
248 if (sigsetjmp(error_jmp, 1)) {
249 /* called via error(), errorx() or log_error() */
253 /* We do not currently log the exit status. */
255 warningx(_("unable to execute %s: %s"), safe_cmnd, strerror(error_code));
257 /* Close the session we opened in sudoers_policy_init_session(). */
258 if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT))
259 (void)sudo_auth_end_session(runas_pw);
261 /* Free remaining references to password and group entries. */
262 pw_delref(sudo_user.pw);
264 if (runas_gr != NULL)
266 if (user_group_list != NULL)
267 grlist_delref(user_group_list);
271 * The init_session function is called before executing the command
272 * and before uid/gid changes occur.
275 sudoers_policy_init_session(struct passwd *pwd)
277 if (sigsetjmp(error_jmp, 1)) {
278 /* called via error(), errorx() or log_error() */
282 return sudo_auth_begin_session(pwd);
286 sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
287 char **command_infop[], char **argv_out[], char **user_env_out[])
289 static char *command_info[32]; /* XXX */
290 char **edit_argv = NULL;
291 struct sudo_nss *nss;
292 int cmnd_status = -1, validated;
293 volatile int info_len = 0;
294 volatile int rval = TRUE;
296 if (sigsetjmp(error_jmp, 1)) {
297 /* error recovery via error(), errorx() or log_error() */
302 /* Is root even allowed to run sudo? */
303 if (user_uid == 0 && !def_root_sudo) {
304 warningx(_("sudoers specifies that root is not allowed to sudo"));
308 /* Check for -C overriding def_closefrom. */
309 if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
310 if (!def_closefrom_override) {
311 warningx(_("you are not permitted to use the -C option"));
314 def_closefrom = user_closefrom;
317 set_perms(PERM_INITIAL);
319 /* Environment variables specified on the command line. */
320 if (env_add != NULL && env_add[0] != NULL)
321 sudo_user.env_vars = env_add;
324 * Make a local copy of argc/argv, with special handling
325 * for pseudo-commands and the '-i' option.
329 NewArgv = emalloc2(NewArgc + 1, sizeof(char *));
330 NewArgv[0] = user_cmnd;
333 /* Must leave an extra slot before NewArgv for bash's --login */
335 NewArgv = emalloc2(NewArgc + 2, sizeof(char *));
336 memcpy(++NewArgv, argv, argc * sizeof(char *));
337 NewArgv[NewArgc] = NULL;
338 if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
339 NewArgv[0] = estrdup(runas_pw->pw_shell);
342 /* If given the -P option, set the "preserve_groups" flag. */
343 if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
344 def_preserve_groups = TRUE;
346 /* Find command in path */
347 cmnd_status = set_cmnd();
348 if (cmnd_status == -1) {
353 #ifdef HAVE_SETLOCALE
354 if (!setlocale(LC_ALL, def_sudoers_locale)) {
355 warningx(_("unable to set locale to \"%s\", using \"C\""),
357 setlocale(LC_ALL, "C");
362 * Check sudoers sources.
364 validated = FLAG_NO_USER | FLAG_NO_HOST;
365 tq_foreach_fwd(snl, nss) {
366 validated = nss->lookup(nss, validated, pwflag);
368 if (ISSET(validated, VALIDATE_OK)) {
369 /* Handle "= auth" in netsvc.conf */
370 if (nss->ret_if_found)
373 /* Handle [NOTFOUND=return] */
374 if (nss->ret_if_notfound)
379 if (safe_cmnd == NULL)
380 safe_cmnd = estrdup(user_cmnd);
382 #ifdef HAVE_SETLOCALE
383 setlocale(LC_ALL, "");
386 /* If only a group was specified, set runas_pw based on invoking user. */
387 if (runas_pw == NULL)
388 set_runaspw(user_name);
391 * Look up the timestamp dir owner if one is specified.
393 if (def_timestampowner) {
396 if (*def_timestampowner == '#')
397 pw = sudo_getpwuid(atoi(def_timestampowner + 1));
399 pw = sudo_getpwnam(def_timestampowner);
401 log_error(0, _("timestamp owner (%s): No such user"),
403 timestamp_uid = pw->pw_uid;
407 /* If no command line args and "shell_noargs" is not set, error out. */
408 if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs) {
409 rval = -2; /* usage error */
413 /* Bail if a tty is required and we don't have one. */
414 if (def_requiretty) {
415 int fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
417 audit_failure(NewArgv, _("no tty"));
418 warningx(_("sorry, you must have a tty to run sudo"));
425 * We don't reset the environment for sudoedit or if the user
426 * specified the -E command line flag and they have setenv privs.
428 if (ISSET(sudo_mode, MODE_EDIT) ||
429 (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv))
430 def_env_reset = FALSE;
432 /* Build a new environment that avoids any nasty bits. */
435 /* Require a password if sudoers says so. */
436 if (def_authenticate) {
437 int rc = check_user(validated, sudo_mode);
444 /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
445 /* XXX - causes confusion when root is not listed in sudoers */
446 if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
447 if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
450 if ((pw = sudo_getpwnam(prev_user)) != NULL) {
451 if (sudo_user.pw != NULL)
452 pw_delref(sudo_user.pw);
458 /* If the user was not allowed to run the command we are done. */
459 if (!ISSET(validated, VALIDATE_OK)) {
460 if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
461 audit_failure(NewArgv, _("No user or host"));
462 log_denial(validated, 1);
466 * We'd like to not leak path info at all here, but that can
467 * *really* confuse the users. To really close the leak we'd
468 * have to say "not allowed to run foo" even when the problem
469 * is just "no foo in path" since the user can trivially set
470 * their path to just contain a single dir.
472 log_denial(validated,
473 !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
474 if (cmnd_status == NOT_FOUND)
475 warningx(_("%s: command not found"), user_cmnd);
476 else if (cmnd_status == NOT_FOUND_DOT)
477 warningx(_("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run."), user_cmnd, user_cmnd, user_cmnd);
479 /* Just tell the user they are not allowed to run foo. */
480 log_denial(validated, 1);
482 audit_failure(NewArgv, _("validation failure"));
487 /* Create Ubuntu-style dot file to indicate sudo was successful. */
488 create_admin_success_flag();
490 /* Finally tell the user if the command did not exist. */
491 if (cmnd_status == NOT_FOUND_DOT) {
492 audit_failure(NewArgv, _("command in current directory"));
493 warningx(_("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run."), user_cmnd, user_cmnd, user_cmnd);
495 } else if (cmnd_status == NOT_FOUND) {
496 audit_failure(NewArgv, _("%s: command not found"), user_cmnd);
497 warningx(_("%s: command not found"), user_cmnd);
501 /* If user specified env vars make sure sudoers allows it. */
502 if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
503 if (ISSET(sudo_mode, MODE_PRESERVE_ENV)) {
504 warningx(_("sorry, you are not allowed to preserve the environment"));
507 validate_env_vars(sudo_user.env_vars);
510 if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && (def_log_input || def_log_output)) {
511 if (def_iolog_file && def_iolog_dir) {
512 command_info[info_len++] = expand_iolog_path("iolog_path=",
513 def_iolog_dir, def_iolog_file, &sudo_user.iolog_file);
514 sudo_user.iolog_file++;
517 command_info[info_len++] = estrdup("iolog_stdin=true");
518 command_info[info_len++] = estrdup("iolog_ttyin=true");
520 if (def_log_output) {
521 command_info[info_len++] = estrdup("iolog_stdout=true");
522 command_info[info_len++] = estrdup("iolog_stderr=true");
523 command_info[info_len++] = estrdup("iolog_ttyout=true");
526 command_info[info_len++] = estrdup("iolog_compress=true");
529 log_allowed(validated);
530 if (ISSET(sudo_mode, MODE_CHECK))
531 rval = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
532 else if (ISSET(sudo_mode, MODE_LIST))
533 display_privs(snl, list_pw ? list_pw : sudo_user.pw); /* XXX - return val */
535 /* Cleanup sudoers sources */
536 tq_foreach_fwd(snl, nss) {
539 if (def_group_plugin)
540 group_plugin_unload();
542 if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST))) {
543 /* rval already set appropriately */
548 * Set umask based on sudoers.
549 * If user's umask is more restrictive, OR in those bits too
550 * unless umask_override is set.
552 if (def_umask != 0777) {
553 mode_t mask = def_umask;
554 if (!def_umask_override) {
555 mode_t omask = umask(mask);
559 easprintf(&command_info[info_len++], "umask=0%o", (unsigned int)mask);
562 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
565 /* Convert /bin/sh -> -sh so shell knows it is a login shell */
566 if ((p = strrchr(NewArgv[0], '/')) == NULL)
571 /* Set cwd to run user's homedir. */
572 command_info[info_len++] = fmt_string("cwd", runas_pw->pw_dir);
575 * Newer versions of bash require the --login option to be used
576 * in conjunction with the -c option even if the shell name starts
577 * with a '-'. Unfortunately, bash 1.x uses -login, not --login
578 * so this will cause an error for that.
580 if (NewArgc > 1 && strcmp(NewArgv[0], "-bash") == 0 &&
581 strcmp(NewArgv[1], "-c") == 0) {
582 /* Use the extra slot before NewArgv so we can store --login. */
585 NewArgv[0] = NewArgv[1];
586 NewArgv[1] = "--login";
589 #if defined(__linux__) || defined(_AIX)
590 /* Insert system-wide environment variables. */
591 read_env_file(_PATH_ENVIRONMENT, TRUE);
595 /* Insert system-wide environment variables. */
597 read_env_file(def_env_file, FALSE);
599 /* Insert user-specified environment variables. */
600 insert_env_vars(sudo_user.env_vars);
602 /* Restore signal handlers before we exec. */
603 (void) sigaction(SIGINT, &saved_sa_int, NULL);
604 (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
605 (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
607 if (ISSET(sudo_mode, MODE_EDIT)) {
608 char *editor = find_editor(NewArgc - 1, NewArgv + 1, &edit_argv);
611 command_info[info_len++] = fmt_string("command", editor);
612 command_info[info_len++] = estrdup("sudoedit=true");
614 command_info[info_len++] = fmt_string("command", safe_cmnd);
616 if (def_stay_setuid) {
617 easprintf(&command_info[info_len++], "runas_uid=%u",
618 (unsigned int)user_uid);
619 easprintf(&command_info[info_len++], "runas_gid=%u",
620 (unsigned int)user_gid);
621 easprintf(&command_info[info_len++], "runas_euid=%u",
622 (unsigned int)runas_pw->pw_uid);
623 easprintf(&command_info[info_len++], "runas_egid=%u",
624 runas_gr ? (unsigned int)runas_gr->gr_gid :
625 (unsigned int)runas_pw->pw_gid);
627 easprintf(&command_info[info_len++], "runas_uid=%u",
628 (unsigned int)runas_pw->pw_uid);
629 easprintf(&command_info[info_len++], "runas_gid=%u",
630 runas_gr ? (unsigned int)runas_gr->gr_gid :
631 (unsigned int)runas_pw->pw_gid);
633 if (def_preserve_groups) {
634 command_info[info_len++] = "preserve_groups=true";
639 struct group_list *grlist = get_group_list(runas_pw);
641 glsize = sizeof("runas_groups=") - 1 + (grlist->ngids * (MAX_UID_T_LEN + 1));
642 gid_list = emalloc(glsize);
643 memcpy(gid_list, "runas_groups=", sizeof("runas_groups=") - 1);
644 cp = gid_list + sizeof("runas_groups=") - 1;
645 for (i = 0; i < grlist->ngids; i++) {
646 /* XXX - check rval */
647 len = snprintf(cp, glsize - (cp - gid_list), "%s%u",
648 i ? "," : "", (unsigned int) grlist->gids[i]);
651 command_info[info_len++] = gid_list;
652 grlist_delref(grlist);
654 if (def_closefrom >= 0)
655 easprintf(&command_info[info_len++], "closefrom=%d", def_closefrom);
657 command_info[info_len++] = estrdup("noexec=true");
659 command_info[info_len++] = fmt_string("noexec_file", def_noexec_file);
661 command_info[info_len++] = estrdup("set_utmp=true");
663 command_info[info_len++] = estrdup("use_pty=true");
665 command_info[info_len++] = fmt_string("utmp_user", runas_pw->pw_name);
666 #ifdef HAVE_LOGIN_CAP_H
668 command_info[info_len++] = fmt_string("login_class", lc->lc_class);
669 #endif /* HAVE_LOGIN_CAP_H */
671 if (user_role != NULL)
672 command_info[info_len++] = fmt_string("selinux_role", user_role);
673 if (user_type != NULL)
674 command_info[info_len++] = fmt_string("selinux_type", user_type);
675 #endif /* HAVE_SELINUX */
677 /* Must audit before uid change. */
678 audit_success(NewArgv);
680 *command_infop = command_info;
682 *argv_out = edit_argv ? edit_argv : NewArgv;
683 *user_env_out = env_get(); /* our private copy */
693 /* Close the password and group files and free up memory. */
701 sudoers_policy_check(int argc, char * const argv[], char *env_add[],
702 char **command_infop[], char **argv_out[], char **user_env_out[])
704 if (!ISSET(sudo_mode, MODE_EDIT))
705 SET(sudo_mode, MODE_RUN);
707 return sudoers_policy_main(argc, argv, 0, env_add, command_infop,
708 argv_out, user_env_out);
712 sudoers_policy_validate(void)
714 user_cmnd = "validate";
715 SET(sudo_mode, MODE_VALIDATE);
717 return sudoers_policy_main(0, NULL, I_VERIFYPW, NULL, NULL, NULL, NULL);
721 sudoers_policy_invalidate(int remove)
724 if (sigsetjmp(error_jmp, 1) == 0) {
725 remove_timestamp(remove);
731 sudoers_policy_list(int argc, char * const argv[], int verbose,
732 const char *list_user)
738 SET(sudo_mode, MODE_CHECK);
740 SET(sudo_mode, MODE_LIST);
744 list_pw = sudo_getpwnam(list_user);
745 if (list_pw == NULL) {
746 warningx(_("unknown user: %s"), list_user);
750 rval = sudoers_policy_main(argc, argv, I_LISTPW, NULL, NULL, NULL, NULL);
760 * Initialize timezone, set umask, fill in ``sudo_user'' struct and
761 * load the ``interfaces'' array.
764 init_vars(char * const envp[])
769 (void) tzset(); /* set the timezone if applicable */
770 #endif /* HAVE_TZSET */
772 for (ep = envp; *ep; ep++) {
773 /* XXX - don't fill in if empty string */
776 if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
777 user_ccname = *ep + 11;
780 if (strncmp("PATH=", *ep, 5) == 0)
784 if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
785 user_prompt = *ep + 12;
786 else if (strncmp("SUDO_USER=", *ep, 10) == 0)
787 prev_user = *ep + 10;
793 * Get a local copy of the user's struct passwd with the shadow password
794 * if necessary. It is assumed that euid is 0 at this point so we
795 * can read the shadow passwd file if necessary.
797 if ((sudo_user.pw = sudo_getpwuid(user_uid)) == NULL) {
799 * It is not unusual for users to place "sudo -k" in a .logout
800 * file which can cause sudo to be run during reboot after the
801 * YP/NIS/NIS+/LDAP/etc daemon has died.
803 if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
804 errorx(1, _("unknown uid: %u"), (unsigned int) user_uid);
806 /* Need to make a fake struct passwd for the call to log_error(). */
807 sudo_user.pw = sudo_fakepwnamid(user_name, user_uid, user_gid);
808 log_error(0, _("unknown uid: %u"), (unsigned int) user_uid);
815 if (user_group_list == NULL)
816 user_group_list = get_group_list(sudo_user.pw);
818 /* Set runas callback. */
819 sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
821 /* It is now safe to use log_error() and set_perms() */
825 * Fill in user_cmnd, user_args, user_base and user_stat variables
826 * and apply any command-specific defaults entries.
832 char *path = user_path;
834 /* Resolve the path and return. */
836 user_stat = emalloc(sizeof(struct stat));
838 /* Default value for cmnd, overridden below. */
839 if (user_cmnd == NULL)
840 user_cmnd = NewArgv[0];
842 if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
843 if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
844 if (def_secure_path && !user_is_exempt())
845 path = def_secure_path;
846 set_perms(PERM_RUNAS);
847 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
851 /* Failed as root, try as invoking user. */
852 set_perms(PERM_USER);
853 rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
861 char *to, *from, **av;
864 /* Alloc and build up user_args. */
865 for (size = 0, av = NewArgv + 1; *av; av++)
866 size += strlen(*av) + 1;
867 user_args = emalloc(size);
868 if (ISSET(sudo_mode, MODE_SHELL|MODE_LOGIN_SHELL)) {
870 * When running a command via a shell, the sudo front-end
871 * escapes potential meta chars. We unescape non-spaces
872 * for sudoers matching and logging purposes.
874 for (to = user_args, av = NewArgv + 1; (from = *av); av++) {
876 if (from[0] == '\\' && !isspace((unsigned char)from[1]))
884 for (to = user_args, av = NewArgv + 1; *av; av++) {
885 n = strlcpy(to, *av, size - (to - user_args));
886 if (n >= size - (to - user_args))
887 errorx(1, _("internal error, set_cmnd() overflow"));
895 if (strlen(user_cmnd) >= PATH_MAX)
896 errorx(1, _("%s: %s"), user_cmnd, strerror(ENAMETOOLONG));
898 if ((user_base = strrchr(user_cmnd, '/')) != NULL)
901 user_base = user_cmnd;
903 if (!update_defaults(SETDEF_CMND))
904 log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
910 * Open sudoers and sanity check mode/owner/type.
911 * Returns a handle to the sudoers file or NULL on error.
914 open_sudoers(const char *sudoers, int doedit, int *keepopen)
921 * Fix the mode and group on sudoers file from old default.
922 * Only works if file system is readable/writable by root.
924 if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
925 sudoers_uid == statbuf.st_uid && sudoers_mode != 0400 &&
926 (statbuf.st_mode & 0007777) == 0400) {
928 if (chmod(sudoers, sudoers_mode) == 0) {
929 warningx(_("fixed mode on %s"), sudoers);
930 SET(statbuf.st_mode, sudoers_mode);
931 if (statbuf.st_gid != sudoers_gid) {
932 if (chown(sudoers, (uid_t) -1, sudoers_gid) == 0) {
933 warningx(_("set group on %s"), sudoers);
934 statbuf.st_gid = sudoers_gid;
936 warning(_("unable to set group on %s"), sudoers);
939 warning(_("unable to fix mode on %s"), sudoers);
943 * Sanity checks on sudoers file. Must be done as sudoers
944 * file owner. We already did a stat as root, so use that
945 * data if we can't stat as sudoers file owner.
947 set_perms(PERM_SUDOERS);
949 if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
950 log_error(USE_ERRNO|NO_EXIT, _("unable to stat %s"), sudoers);
951 else if (!S_ISREG(statbuf.st_mode))
952 log_error(NO_EXIT, _("%s is not a regular file"), sudoers);
953 else if ((statbuf.st_mode & 07577) != sudoers_mode)
954 log_error(NO_EXIT, _("%s is mode 0%o, should be 0%o"), sudoers,
955 (unsigned int) (statbuf.st_mode & 07777),
956 (unsigned int) sudoers_mode);
957 else if (statbuf.st_uid != sudoers_uid)
958 log_error(NO_EXIT, _("%s is owned by uid %u, should be %u"), sudoers,
959 (unsigned int) statbuf.st_uid, (unsigned int) sudoers_uid);
960 else if (statbuf.st_gid != sudoers_gid && ISSET(statbuf.st_mode, S_IRGRP|S_IWGRP))
961 log_error(NO_EXIT, _("%s is owned by gid %u, should be %u"), sudoers,
962 (unsigned int) statbuf.st_gid, (unsigned int) sudoers_gid);
963 else if ((fp = fopen(sudoers, "r")) == NULL)
964 log_error(USE_ERRNO|NO_EXIT, _("unable to open %s"), sudoers);
967 * Make sure we can actually read sudoers so we can present the
968 * user with a reasonable error message (unlike the lexer).
970 if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
971 log_error(USE_ERRNO|NO_EXIT, _("unable to read %s"), sudoers);
979 (void) fcntl(fileno(fp), F_SETFD, 1);
982 restore_perms(); /* change back to root */
986 #ifdef HAVE_LOGIN_CAP_H
988 set_loginclass(struct passwd *pw)
993 * Don't make it a fatal error if the user didn't specify the login
994 * class themselves. We do this because if login.conf gets
995 * corrupted we want the admin to be able to use sudo to fix it.
998 errflags = NO_MAIL|MSG_ONLY;
1000 errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1002 if (login_class && strcmp(login_class, "-") != 0) {
1003 if (user_uid != 0 &&
1004 strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1005 errorx(1, _("only root can use `-c %s'"), login_class);
1007 login_class = pw->pw_class;
1008 if (!login_class || !*login_class)
1010 (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1013 lc = login_getclass(login_class);
1014 if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1015 log_error(errflags, _("unknown login class: %s"), login_class);
1017 lc = login_getclass(NULL); /* needed for login_getstyle() later */
1022 set_loginclass(struct passwd *pw)
1025 #endif /* HAVE_LOGIN_CAP_H */
1028 * Look up the fully qualified domain name and set user_host and user_shost.
1033 #ifdef HAVE_GETADDRINFO
1034 struct addrinfo *res0, hint;
1040 #ifdef HAVE_GETADDRINFO
1041 zero_bytes(&hint, sizeof(hint));
1042 hint.ai_family = PF_UNSPEC;
1043 hint.ai_flags = AI_CANONNAME;
1044 if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1046 if (!(hp = gethostbyname(user_host))) {
1048 log_error(MSG_ONLY|NO_EXIT,
1049 _("unable to resolve host %s"), user_host);
1051 if (user_shost != user_host)
1054 #ifdef HAVE_GETADDRINFO
1055 user_host = estrdup(res0->ai_canonname);
1058 user_host = estrdup(hp->h_name);
1061 if ((p = strchr(user_host, '.')) != NULL)
1062 user_shost = estrndup(user_host, (size_t)(p - user_host));
1064 user_shost = user_host;
1068 * Get passwd entry for the user we are going to run commands as
1069 * and store it in runas_pw. By default, commands run as "root".
1072 set_runaspw(const char *user)
1074 if (runas_pw != NULL)
1075 pw_delref(runas_pw);
1077 if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1078 runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1080 if ((runas_pw = sudo_getpwnam(user)) == NULL)
1081 log_error(NO_MAIL|MSG_ONLY, _("unknown user: %s"), user);
1086 * Get group entry for the group we are going to run commands as
1087 * and store it in runas_gr.
1090 set_runasgr(const char *group)
1092 if (runas_gr != NULL)
1093 gr_delref(runas_gr);
1094 if (*group == '#') {
1095 if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1096 runas_gr = sudo_fakegrnam(group);
1098 if ((runas_gr = sudo_getgrnam(group)) == NULL)
1099 log_error(NO_MAIL|MSG_ONLY, _("unknown group: %s"), group);
1104 * Callback for runas_default sudoers setting.
1107 cb_runas_default(const char *user)
1109 /* Only reset runaspw if user didn't specify one. */
1110 if (!runas_user && !runas_group)
1116 * Cleanup hook for error()/errorx()
1119 plugin_cleanup(int gotsignal)
1121 struct sudo_nss *nss;
1125 tq_foreach_fwd(snl, nss)
1128 if (def_group_plugin)
1129 group_plugin_unload();
1136 sudoers_policy_version(int verbose)
1138 if (sigsetjmp(error_jmp, 1)) {
1139 /* error recovery via error(), errorx() or log_error() */
1143 sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers policy plugin version %s\n"),
1145 sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers file grammar version %d\n"),
1146 SUDOERS_GRAMMAR_VERSION);
1149 sudo_printf(SUDO_CONV_INFO_MSG, _("\nSudoers path: %s\n"), sudoers_file);
1151 # ifdef _PATH_NSSWITCH_CONF
1152 sudo_printf(SUDO_CONV_INFO_MSG, _("nsswitch path: %s\n"), _PATH_NSSWITCH_CONF);
1154 sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.conf path: %s\n"), _PATH_LDAP_CONF);
1155 sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.secret path: %s\n"), _PATH_LDAP_SECRET);
1157 dump_auth_methods();
1159 sudo_printf(SUDO_CONV_INFO_MSG, "\n");
1160 dump_interfaces(interfaces_string);
1161 sudo_printf(SUDO_CONV_INFO_MSG, "\n");
1167 deserialize_info(char * const settings[], char * const user_info[])
1170 const char *p, *groups = NULL;
1173 #define MATCHES(s, v) (strncmp(s, v, sizeof(v) - 1) == 0)
1175 /* Parse command line settings. */
1176 user_closefrom = -1;
1177 for (cur = settings; *cur != NULL; cur++) {
1178 if (MATCHES(*cur, "closefrom=")) {
1179 user_closefrom = atoi(*cur + sizeof("closefrom=") - 1);
1182 if (MATCHES(*cur, "debug_level=")) {
1183 debug_level = atoi(*cur + sizeof("debug_level=") - 1);
1186 if (MATCHES(*cur, "runas_user=")) {
1187 runas_user = *cur + sizeof("runas_user=") - 1;
1190 if (MATCHES(*cur, "runas_group=")) {
1191 runas_group = *cur + sizeof("runas_group=") - 1;
1194 if (MATCHES(*cur, "prompt=")) {
1195 user_prompt = *cur + sizeof("prompt=") - 1;
1196 def_passprompt_override = TRUE;
1199 if (MATCHES(*cur, "set_home=")) {
1200 if (atobool(*cur + sizeof("set_home=") - 1) == TRUE)
1201 SET(flags, MODE_RESET_HOME);
1204 if (MATCHES(*cur, "preserve_environment=")) {
1205 if (atobool(*cur + sizeof("preserve_environment=") - 1) == TRUE)
1206 SET(flags, MODE_PRESERVE_ENV);
1209 if (MATCHES(*cur, "run_shell=")) {
1210 if (atobool(*cur + sizeof("run_shell=") - 1) == TRUE)
1211 SET(flags, MODE_SHELL);
1214 if (MATCHES(*cur, "login_shell=")) {
1215 if (atobool(*cur + sizeof("login_shell=") - 1) == TRUE) {
1216 SET(flags, MODE_LOGIN_SHELL);
1217 def_env_reset = TRUE;
1221 if (MATCHES(*cur, "implied_shell=")) {
1222 if (atobool(*cur + sizeof("implied_shell=") - 1) == TRUE)
1223 SET(flags, MODE_IMPLIED_SHELL);
1226 if (MATCHES(*cur, "preserve_groups=")) {
1227 if (atobool(*cur + sizeof("preserve_groups=") - 1) == TRUE)
1228 SET(flags, MODE_PRESERVE_GROUPS);
1231 if (MATCHES(*cur, "ignore_ticket=")) {
1232 if (atobool(*cur + sizeof("ignore_ticket=") - 1) == TRUE)
1233 SET(flags, MODE_IGNORE_TICKET);
1236 if (MATCHES(*cur, "noninteractive=")) {
1237 if (atobool(*cur + sizeof("noninteractive=") - 1) == TRUE)
1238 SET(flags, MODE_NONINTERACTIVE);
1241 if (MATCHES(*cur, "sudoedit=")) {
1242 if (atobool(*cur + sizeof("sudoedit=") - 1) == TRUE)
1243 SET(flags, MODE_EDIT);
1246 if (MATCHES(*cur, "login_class=")) {
1247 login_class = *cur + sizeof("login_class=") - 1;
1248 def_use_loginclass = TRUE;
1252 if (MATCHES(*cur, "selinux_role=")) {
1253 user_role = *cur + sizeof("selinux_role=") - 1;
1256 if (MATCHES(*cur, "selinux_type=")) {
1257 user_type = *cur + sizeof("selinux_type=") - 1;
1260 #endif /* HAVE_SELINUX */
1261 #ifdef HAVE_BSD_AUTH_H
1262 if (MATCHES(*cur, "bsdauth_type=")) {
1263 login_style = *cur + sizeof("bsdauth_type=") - 1;
1266 #endif /* HAVE_BSD_AUTH_H */
1267 #if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
1268 if (MATCHES(*cur, "progname=")) {
1269 setprogname(*cur + sizeof("progname=") - 1);
1273 if (MATCHES(*cur, "network_addrs=")) {
1274 interfaces_string = *cur + sizeof("network_addrs=") - 1;
1275 set_interfaces(interfaces_string);
1278 if (MATCHES(*cur, "sudoers_file=")) {
1279 sudoers_file = *cur + sizeof("sudoers_file=") - 1;
1282 if (MATCHES(*cur, "sudoers_uid=")) {
1283 sudoers_uid = (uid_t) atoi(*cur + sizeof("sudoers_uid=") - 1);
1286 if (MATCHES(*cur, "sudoers_gid=")) {
1287 sudoers_gid = (gid_t) atoi(*cur + sizeof("sudoers_gid=") - 1);
1290 if (MATCHES(*cur, "sudoers_mode=")) {
1291 sudoers_mode = (mode_t) strtol(*cur + sizeof("sudoers_mode=") - 1,
1297 for (cur = user_info; *cur != NULL; cur++) {
1298 if (MATCHES(*cur, "user=")) {
1299 user_name = estrdup(*cur + sizeof("user=") - 1);
1302 if (MATCHES(*cur, "uid=")) {
1303 user_uid = (uid_t) atoi(*cur + sizeof("uid=") - 1);
1306 if (MATCHES(*cur, "gid=")) {
1307 p = *cur + sizeof("gid=") - 1;
1308 user_gid = (gid_t) atoi(p);
1311 if (MATCHES(*cur, "groups=")) {
1312 groups = *cur + sizeof("groups=") - 1;
1315 if (MATCHES(*cur, "cwd=")) {
1316 user_cwd = estrdup(*cur + sizeof("cwd=") - 1);
1319 if (MATCHES(*cur, "tty=")) {
1320 user_tty = user_ttypath = estrdup(*cur + sizeof("tty=") - 1);
1321 if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
1322 user_tty += sizeof(_PATH_DEV) - 1;
1325 if (MATCHES(*cur, "host=")) {
1326 user_host = user_shost = estrdup(*cur + sizeof("host=") - 1);
1327 if ((p = strchr(user_host, '.')))
1328 user_shost = estrndup(user_host, (size_t)(p - user_host));
1331 if (MATCHES(*cur, "lines=")) {
1332 sudo_user.lines = atoi(*cur + sizeof("lines=") - 1);
1335 if (MATCHES(*cur, "cols=")) {
1336 sudo_user.cols = atoi(*cur + sizeof("cols=") - 1);
1340 if (user_cwd == NULL)
1341 user_cwd = "unknown";
1342 if (user_tty == NULL)
1343 user_tty = "unknown"; /* user_ttypath remains NULL */
1345 if (groups != NULL && groups[0] != '\0') {
1350 /* Count number of groups, including passwd gid. */
1352 for (cp = groups; *cp != '\0'; cp++) {
1357 /* The first gid in the list is the passwd group gid. */
1358 gids = emalloc2(ngids, sizeof(GETGROUPS_T));
1363 gids[ngids] = atoi(cp);
1364 if (gids[0] != gids[ngids])
1366 cp = strchr(cp, ',');
1369 cp++; /* skip over comma */
1371 set_group_list(user_name, gids, ngids);
1380 resolve_editor(char *editor, int nfiles, char **files, char ***argv_out)
1382 char *cp, **nargv, *editor_path = NULL;
1383 int ac, i, nargc, wasblank;
1385 editor = estrdup(editor); /* becomes part of argv_out */
1388 * Split editor into an argument vector; editor is reused (do not free).
1389 * The EDITOR and VISUAL environment variables may contain command
1390 * line args so look for those and alloc space for them too.
1393 for (wasblank = FALSE, cp = editor; *cp != '\0'; cp++) {
1394 if (isblank((unsigned char) *cp))
1396 else if (wasblank) {
1401 /* If we can't find the editor in the user's PATH, give up. */
1402 cp = strtok(editor, " \t");
1404 find_path(cp, &editor_path, NULL, getenv("PATH"), 0) != FOUND) {
1408 nargv = (char **) emalloc2(nargc + 1 + nfiles + 1, sizeof(char *));
1409 for (ac = 0; cp != NULL && ac < nargc; ac++) {
1411 cp = strtok(NULL, " \t");
1414 for (i = 0; i < nfiles; )
1415 nargv[ac++] = files[i++];
1423 * Determine which editor to use. We don't need to worry about restricting
1424 * this to a "safe" editor since it runs with the uid of the invoking user,
1425 * not the runas (privileged) user.
1428 find_editor(int nfiles, char **files, char ***argv_out)
1430 char *cp, *editor, *editor_path = NULL, **ev, *ev0[4];
1433 * If any of SUDO_EDITOR, VISUAL or EDITOR are set, choose the first one.
1435 ev0[0] = "SUDO_EDITOR";
1439 for (ev = ev0; *ev != NULL; ev++) {
1440 if ((editor = getenv(*ev)) != NULL && *editor != '\0') {
1441 editor_path = resolve_editor(editor, nfiles, files, argv_out);
1442 if (editor_path != NULL)
1446 if (editor_path == NULL) {
1447 /* def_editor could be a path, split it up */
1448 editor = estrdup(def_editor);
1449 cp = strtok(editor, ":");
1450 while (cp != NULL && editor_path == NULL) {
1451 editor_path = resolve_editor(cp, nfiles, files, argv_out);
1452 cp = strtok(NULL, ":");
1458 audit_failure(NewArgv, _("%s: command not found"), editor);
1459 warningx(_("%s: command not found"), editor);
1464 #ifdef USE_ADMIN_FLAG
1466 create_admin_success_flag(void)
1468 struct stat statbuf;
1469 char flagfile[PATH_MAX];
1472 /* Check whether the user is in the admin group. */
1473 if (!user_in_group(sudo_user.pw, "admin"))
1476 /* Build path to flag file. */
1477 n = snprintf(flagfile, sizeof(flagfile), "%s/.sudo_as_admin_successful",
1479 if (n <= 0 || n >= sizeof(flagfile))
1482 /* Create admin flag file if it doesn't already exist. */
1483 set_perms(PERM_USER);
1484 if (stat(flagfile, &statbuf) != 0) {
1485 fd = open(flagfile, O_CREAT|O_WRONLY|O_EXCL, 0644);
1490 #else /* !USE_ADMIN_FLAG */
1492 create_admin_success_flag(void)
1496 #endif /* USE_ADMIN_FLAG */
1498 struct policy_plugin sudoers_policy = {
1501 sudoers_policy_open,
1502 sudoers_policy_close,
1503 sudoers_policy_version,
1504 sudoers_policy_check,
1505 sudoers_policy_list,
1506 sudoers_policy_validate,
1507 sudoers_policy_invalidate,
1508 sudoers_policy_init_session