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* Copyright (c) 1993-1996, 1998-2011 Todd C. Miller <Todd.Miller@courtesan.com>
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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* For a brief history of sudo, please see the HISTORY file included
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* with this distribution.
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#include <sys/types.h>
34
#include <sys/param.h>
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#include <sys/socket.h>
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#endif /* STDC_HEADERS */
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#endif /* HAVE_UNISTD_H */
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#include <netinet/in.h>
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#ifdef HAVE_LOGIN_CAP_H
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# include <login_cap.h>
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# ifndef LOGIN_DEFROOTCLASS
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# define LOGIN_DEFROOTCLASS "daemon"
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# include <selinux/selinux.h>
81
#include "interfaces.h"
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#include "sudoers_version.h"
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#include "auth/sudo_auth.h"
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static void init_vars(char * const *);
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static int set_cmnd(void);
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static void set_loginclass(struct passwd *);
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static void set_runaspw(const char *);
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static void set_runasgr(const char *);
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static int cb_runas_default(const char *);
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static int sudoers_policy_version(int verbose);
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static int deserialize_info(char * const settings[], char * const user_info[]);
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static char *find_editor(int nfiles, char **files, char ***argv_out);
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static void create_admin_success_flag(void);
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const char *sudoers_file = _PATH_SUDOERS;
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mode_t sudoers_mode = SUDOERS_MODE;
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uid_t sudoers_uid = SUDOERS_UID;
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gid_t sudoers_gid = SUDOERS_GID;
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struct sudo_user sudo_user;
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struct passwd *list_pw;
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struct interface *interfaces;
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extern int errorlineno;
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extern int parse_error;
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extern char *errorfile;
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#ifdef HAVE_LOGIN_CAP_H
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#endif /* HAVE_LOGIN_CAP_H */
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#ifdef HAVE_BSD_AUTH_H
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#endif /* HAVE_BSD_AUTH_H */
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sudo_conv_t sudo_conv;
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sudo_printf_t sudo_printf;
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static char *prev_user;
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static char *runas_user;
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static char *runas_group;
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static struct sudo_nss_list *snl;
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static const char *interfaces_string;
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static sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
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/* XXX - must be extern for audit bits of sudo_auth.c */
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extern sigjmp_buf error_jmp;
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sudoers_policy_open(unsigned int version, sudo_conv_t conversation,
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sudo_printf_t plugin_printf, char * const settings[],
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char * const user_info[], char * const envp[])
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volatile int sources = 0;
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struct sudo_nss *nss;
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sudo_conv = conversation;
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sudo_printf = plugin_printf;
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if (sigsetjmp(error_jmp, 1)) {
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/* called via error(), errorx() or log_error() */
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bindtextdomain("sudoers", LOCALEDIR);
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* Ignore keyboard-generated signals so the user cannot interrupt
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* us at some point and avoid the logging.
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* Install handler to wait for children when they exit.
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zero_bytes(&sa, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sa.sa_handler = SIG_IGN;
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(void) sigaction(SIGINT, &sa, &saved_sa_int);
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(void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
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(void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
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/* Initialize environment functions (including replacements). */
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/* Setup defaults data structures. */
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/* Parse settings and user_info */
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sudo_mode = deserialize_info(settings, user_info);
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init_vars(envp); /* XXX - move this later? */
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/* Parse nsswitch.conf for sudoers order. */
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snl = sudo_read_nss();
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/* LDAP or NSS may modify the euid so we need to be root for the open. */
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set_perms(PERM_INITIAL);
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set_perms(PERM_ROOT);
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/* Open and parse sudoers, set global defaults */
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tq_foreach_fwd(snl, nss) {
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if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
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if (nss->setdefs(nss) != 0)
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log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
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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) {
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if (group_plugin_load(def_group_plugin) != TRUE)
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def_group_plugin = NULL;
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* Set runas passwd/group entries based on command line or sudoers.
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* Note that if runas_group was specified without runas_user we
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* defer setting runas_pw so the match routines know to ignore it.
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if (runas_group != NULL) {
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set_runasgr(runas_group);
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if (runas_user != NULL)
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set_runaspw(runas_user);
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set_runaspw(runas_user ? runas_user : def_runas_default);
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if (!update_defaults(SETDEF_RUNAS))
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log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
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set_fqdn(); /* deferred until after sudoers is parsed */
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/* Set login class if applicable. */
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set_loginclass(sudo_user.pw);
246
sudoers_policy_close(int exit_status, int error_code)
248
if (sigsetjmp(error_jmp, 1)) {
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/* called via error(), errorx() or log_error() */
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/* We do not currently log the exit status. */
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warningx(_("unable to execute %s: %s"), safe_cmnd, strerror(error_code));
257
/* Close the session we opened in sudoers_policy_init_session(). */
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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);
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* 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() */
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return sudo_auth_begin_session(pwd);
286
sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
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char **command_infop[], char **argv_out[], char **user_env_out[])
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static char *command_info[32]; /* XXX */
290
char **edit_argv = NULL;
291
struct sudo_nss *nss;
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int cmnd_status = -1, validated;
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volatile int info_len = 0;
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volatile int rval = TRUE;
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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"));
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/* Check for -C overriding def_closefrom. */
309
if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
310
if (!def_closefrom_override) {
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warningx(_("you are not permitted to use the -C option"));
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def_closefrom = user_closefrom;
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set_perms(PERM_INITIAL);
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/* Environment variables specified on the command line. */
320
if (env_add != NULL && env_add[0] != NULL)
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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;
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/* 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;
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/* 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"),
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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"));
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* 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) ||
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(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
rval = check_user(validated, sudo_mode);
440
/* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
441
/* XXX - causes confusion when root is not listed in sudoers */
442
if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
443
if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
446
if ((pw = sudo_getpwnam(prev_user)) != NULL) {
447
if (sudo_user.pw != NULL)
448
pw_delref(sudo_user.pw);
454
/* If the user was not allowed to run the command we are done. */
455
if (!ISSET(validated, VALIDATE_OK)) {
456
if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
457
audit_failure(NewArgv, _("No user or host"));
458
log_denial(validated, 1);
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* We'd like to not leak path info at all here, but that can
463
* *really* confuse the users. To really close the leak we'd
464
* have to say "not allowed to run foo" even when the problem
465
* is just "no foo in path" since the user can trivially set
466
* their path to just contain a single dir.
468
log_denial(validated,
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!(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
470
if (cmnd_status == NOT_FOUND)
471
warningx(_("%s: command not found"), user_cmnd);
472
else if (cmnd_status == NOT_FOUND_DOT)
473
warningx(_("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run."), user_cmnd, user_cmnd, user_cmnd);
475
/* Just tell the user they are not allowed to run foo. */
476
log_denial(validated, 1);
478
audit_failure(NewArgv, _("validation failure"));
483
/* Create Ubuntu-style dot file to indicate sudo was successful. */
484
create_admin_success_flag();
486
/* Finally tell the user if the command did not exist. */
487
if (cmnd_status == NOT_FOUND_DOT) {
488
audit_failure(NewArgv, _("command in current directory"));
489
warningx(_("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run."), user_cmnd, user_cmnd, user_cmnd);
491
} else if (cmnd_status == NOT_FOUND) {
492
audit_failure(NewArgv, _("%s: command not found"), user_cmnd);
493
warningx(_("%s: command not found"), user_cmnd);
497
/* If user specified env vars make sure sudoers allows it. */
498
if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
499
if (ISSET(sudo_mode, MODE_PRESERVE_ENV)) {
500
warningx(_("sorry, you are not allowed to preserve the environment"));
503
validate_env_vars(sudo_user.env_vars);
506
if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && (def_log_input || def_log_output)) {
507
if (def_iolog_file && def_iolog_dir) {
508
command_info[info_len++] = expand_iolog_path("iolog_path=",
509
def_iolog_dir, def_iolog_file, &sudo_user.iolog_file);
510
sudo_user.iolog_file++;
513
command_info[info_len++] = estrdup("iolog_stdin=true");
514
command_info[info_len++] = estrdup("iolog_ttyin=true");
516
if (def_log_output) {
517
command_info[info_len++] = estrdup("iolog_stdout=true");
518
command_info[info_len++] = estrdup("iolog_stderr=true");
519
command_info[info_len++] = estrdup("iolog_ttyout=true");
522
command_info[info_len++] = estrdup("iolog_compress=true");
525
log_allowed(validated);
526
if (ISSET(sudo_mode, MODE_CHECK))
527
rval = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
528
else if (ISSET(sudo_mode, MODE_LIST))
529
display_privs(snl, list_pw ? list_pw : sudo_user.pw); /* XXX - return val */
531
/* Cleanup sudoers sources */
532
tq_foreach_fwd(snl, nss) {
535
if (def_group_plugin)
536
group_plugin_unload();
538
if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST))) {
539
/* rval already set appropriately */
544
* Set umask based on sudoers.
545
* If user's umask is more restrictive, OR in those bits too
546
* unless umask_override is set.
548
if (def_umask != 0777) {
549
mode_t mask = def_umask;
550
if (!def_umask_override) {
551
mode_t omask = umask(mask);
555
easprintf(&command_info[info_len++], "umask=0%o", (unsigned int)mask);
558
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
561
/* Convert /bin/sh -> -sh so shell knows it is a login shell */
562
if ((p = strrchr(NewArgv[0], '/')) == NULL)
567
/* Set cwd to run user's homedir. */
568
command_info[info_len++] = fmt_string("cwd", runas_pw->pw_dir);
571
* Newer versions of bash require the --login option to be used
572
* in conjunction with the -c option even if the shell name starts
573
* with a '-'. Unfortunately, bash 1.x uses -login, not --login
574
* so this will cause an error for that.
576
if (NewArgc > 1 && strcmp(NewArgv[0], "-bash") == 0 &&
577
strcmp(NewArgv[1], "-c") == 0) {
578
/* Use the extra slot before NewArgv so we can store --login. */
581
NewArgv[0] = NewArgv[1];
582
NewArgv[1] = "--login";
585
#if defined(__linux__) || defined(_AIX)
586
/* Insert system-wide environment variables. */
587
read_env_file(_PATH_ENVIRONMENT, TRUE);
591
/* Insert system-wide environment variables. */
593
read_env_file(def_env_file, FALSE);
595
/* Insert user-specified environment variables. */
596
insert_env_vars(sudo_user.env_vars);
598
/* Restore signal handlers before we exec. */
599
(void) sigaction(SIGINT, &saved_sa_int, NULL);
600
(void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
601
(void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
603
if (ISSET(sudo_mode, MODE_EDIT)) {
604
char *editor = find_editor(NewArgc - 1, NewArgv + 1, &edit_argv);
607
command_info[info_len++] = fmt_string("command", editor);
608
command_info[info_len++] = estrdup("sudoedit=true");
610
command_info[info_len++] = fmt_string("command", safe_cmnd);
612
if (def_stay_setuid) {
613
easprintf(&command_info[info_len++], "runas_uid=%u",
614
(unsigned int)user_uid);
615
easprintf(&command_info[info_len++], "runas_gid=%u",
616
(unsigned int)user_gid);
617
easprintf(&command_info[info_len++], "runas_euid=%u",
618
(unsigned int)runas_pw->pw_uid);
619
easprintf(&command_info[info_len++], "runas_egid=%u",
620
runas_gr ? (unsigned int)runas_gr->gr_gid :
621
(unsigned int)runas_pw->pw_gid);
623
easprintf(&command_info[info_len++], "runas_uid=%u",
624
(unsigned int)runas_pw->pw_uid);
625
easprintf(&command_info[info_len++], "runas_gid=%u",
626
runas_gr ? (unsigned int)runas_gr->gr_gid :
627
(unsigned int)runas_pw->pw_gid);
629
if (def_preserve_groups) {
630
command_info[info_len++] = "preserve_groups=true";
635
struct group_list *grlist = get_group_list(runas_pw);
637
glsize = sizeof("runas_groups=") - 1 + (grlist->ngids * (MAX_UID_T_LEN + 1));
638
gid_list = emalloc(glsize);
639
memcpy(gid_list, "runas_groups=", sizeof("runas_groups=") - 1);
640
cp = gid_list + sizeof("runas_groups=") - 1;
641
for (i = 0; i < grlist->ngids; i++) {
642
/* XXX - check rval */
643
len = snprintf(cp, glsize - (cp - gid_list), "%s%u",
644
i ? "," : "", (unsigned int) grlist->gids[i]);
647
command_info[info_len++] = gid_list;
648
grlist_delref(grlist);
650
if (def_closefrom >= 0)
651
easprintf(&command_info[info_len++], "closefrom=%d", def_closefrom);
653
command_info[info_len++] = estrdup("noexec=true");
655
command_info[info_len++] = fmt_string("noexec_file", def_noexec_file);
657
command_info[info_len++] = estrdup("set_utmp=true");
659
command_info[info_len++] = estrdup("use_pty=true");
661
command_info[info_len++] = fmt_string("utmp_user", runas_pw->pw_name);
662
#ifdef HAVE_LOGIN_CAP_H
664
command_info[info_len++] = fmt_string("login_class", lc->lc_class);
665
#endif /* HAVE_LOGIN_CAP_H */
667
if (user_role != NULL)
668
command_info[info_len++] = fmt_string("selinux_role", user_role);
669
if (user_type != NULL)
670
command_info[info_len++] = fmt_string("selinux_type", user_type);
671
#endif /* HAVE_SELINUX */
673
/* Must audit before uid change. */
674
audit_success(NewArgv);
676
*command_infop = command_info;
678
*argv_out = edit_argv ? edit_argv : NewArgv;
679
*user_env_out = env_get(); /* our private copy */
689
/* Close the password and group files and free up memory. */
697
sudoers_policy_check(int argc, char * const argv[], char *env_add[],
698
char **command_infop[], char **argv_out[], char **user_env_out[])
700
if (!ISSET(sudo_mode, MODE_EDIT))
701
SET(sudo_mode, MODE_RUN);
703
return sudoers_policy_main(argc, argv, 0, env_add, command_infop,
704
argv_out, user_env_out);
708
sudoers_policy_validate(void)
710
user_cmnd = "validate";
711
SET(sudo_mode, MODE_VALIDATE);
713
return sudoers_policy_main(0, NULL, I_VERIFYPW, NULL, NULL, NULL, NULL);
717
sudoers_policy_invalidate(int remove)
720
if (sigsetjmp(error_jmp, 1) == 0) {
721
remove_timestamp(remove);
727
sudoers_policy_list(int argc, char * const argv[], int verbose,
728
const char *list_user)
734
SET(sudo_mode, MODE_CHECK);
736
SET(sudo_mode, MODE_LIST);
740
list_pw = sudo_getpwnam(list_user);
741
if (list_pw == NULL) {
742
warningx(_("unknown user: %s"), list_user);
746
rval = sudoers_policy_main(argc, argv, I_LISTPW, NULL, NULL, NULL, NULL);
756
* Initialize timezone, set umask, fill in ``sudo_user'' struct and
757
* load the ``interfaces'' array.
760
init_vars(char * const envp[])
765
(void) tzset(); /* set the timezone if applicable */
766
#endif /* HAVE_TZSET */
768
for (ep = envp; *ep; ep++) {
769
/* XXX - don't fill in if empty string */
772
if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
773
user_ccname = *ep + 11;
776
if (strncmp("PATH=", *ep, 5) == 0)
780
if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
781
user_prompt = *ep + 12;
782
else if (strncmp("SUDO_USER=", *ep, 10) == 0)
783
prev_user = *ep + 10;
789
* Get a local copy of the user's struct passwd with the shadow password
790
* if necessary. It is assumed that euid is 0 at this point so we
791
* can read the shadow passwd file if necessary.
793
if ((sudo_user.pw = sudo_getpwuid(user_uid)) == NULL) {
795
* It is not unusual for users to place "sudo -k" in a .logout
796
* file which can cause sudo to be run during reboot after the
797
* YP/NIS/NIS+/LDAP/etc daemon has died.
799
if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
800
errorx(1, _("unknown uid: %u"), (unsigned int) user_uid);
802
/* Need to make a fake struct passwd for the call to log_error(). */
803
sudo_user.pw = sudo_fakepwnamid(user_name, user_uid, user_gid);
804
log_error(0, _("unknown uid: %u"), (unsigned int) user_uid);
811
if (user_group_list == NULL)
812
user_group_list = get_group_list(sudo_user.pw);
814
/* Set runas callback. */
815
sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
817
/* It is now safe to use log_error() and set_perms() */
821
* Fill in user_cmnd, user_args, user_base and user_stat variables
822
* and apply any command-specific defaults entries.
828
char *path = user_path;
830
/* Resolve the path and return. */
832
user_stat = emalloc(sizeof(struct stat));
834
/* Default value for cmnd, overridden below. */
835
if (user_cmnd == NULL)
836
user_cmnd = NewArgv[0];
838
if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
839
if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
840
if (def_secure_path && !user_is_exempt())
841
path = def_secure_path;
842
set_perms(PERM_RUNAS);
843
rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
847
/* Failed as root, try as invoking user. */
848
set_perms(PERM_USER);
849
rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
857
char *to, *from, **av;
860
/* Alloc and build up user_args. */
861
for (size = 0, av = NewArgv + 1; *av; av++)
862
size += strlen(*av) + 1;
863
user_args = emalloc(size);
864
if (ISSET(sudo_mode, MODE_SHELL|MODE_LOGIN_SHELL)) {
866
* When running a command via a shell, the sudo front-end
867
* escapes potential meta chars. We unescape non-spaces
868
* for sudoers matching and logging purposes.
870
for (to = user_args, av = NewArgv + 1; (from = *av); av++) {
872
if (from[0] == '\\' && !isspace((unsigned char)from[1]))
880
for (to = user_args, av = NewArgv + 1; *av; av++) {
881
n = strlcpy(to, *av, size - (to - user_args));
882
if (n >= size - (to - user_args))
883
errorx(1, _("internal error, set_cmnd() overflow"));
891
if (strlen(user_cmnd) >= PATH_MAX)
892
errorx(1, _("%s: %s"), user_cmnd, strerror(ENAMETOOLONG));
894
if ((user_base = strrchr(user_cmnd, '/')) != NULL)
897
user_base = user_cmnd;
899
if (!update_defaults(SETDEF_CMND))
900
log_error(NO_STDERR|NO_EXIT, _("problem with defaults entries"));
906
* Open sudoers and sanity check mode/owner/type.
907
* Returns a handle to the sudoers file or NULL on error.
910
open_sudoers(const char *sudoers, int doedit, int *keepopen)
917
* Fix the mode and group on sudoers file from old default.
918
* Only works if file system is readable/writable by root.
920
if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
921
sudoers_uid == statbuf.st_uid && sudoers_mode != 0400 &&
922
(statbuf.st_mode & 0007777) == 0400) {
924
if (chmod(sudoers, sudoers_mode) == 0) {
925
warningx(_("fixed mode on %s"), sudoers);
926
SET(statbuf.st_mode, sudoers_mode);
927
if (statbuf.st_gid != sudoers_gid) {
928
if (chown(sudoers, (uid_t) -1, sudoers_gid) == 0) {
929
warningx(_("set group on %s"), sudoers);
930
statbuf.st_gid = sudoers_gid;
932
warning(_("unable to set group on %s"), sudoers);
935
warning(_("unable to fix mode on %s"), sudoers);
939
* Sanity checks on sudoers file. Must be done as sudoers
940
* file owner. We already did a stat as root, so use that
941
* data if we can't stat as sudoers file owner.
943
set_perms(PERM_SUDOERS);
945
if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
946
log_error(USE_ERRNO|NO_EXIT, _("unable to stat %s"), sudoers);
947
else if (!S_ISREG(statbuf.st_mode))
948
log_error(NO_EXIT, _("%s is not a regular file"), sudoers);
949
else if ((statbuf.st_mode & 07577) != sudoers_mode)
950
log_error(NO_EXIT, _("%s is mode 0%o, should be 0%o"), sudoers,
951
(unsigned int) (statbuf.st_mode & 07777),
952
(unsigned int) sudoers_mode);
953
else if (statbuf.st_uid != sudoers_uid)
954
log_error(NO_EXIT, _("%s is owned by uid %u, should be %u"), sudoers,
955
(unsigned int) statbuf.st_uid, (unsigned int) sudoers_uid);
956
else if (statbuf.st_gid != sudoers_gid && ISSET(statbuf.st_mode, S_IRGRP|S_IWGRP))
957
log_error(NO_EXIT, _("%s is owned by gid %u, should be %u"), sudoers,
958
(unsigned int) statbuf.st_gid, (unsigned int) sudoers_gid);
959
else if ((fp = fopen(sudoers, "r")) == NULL)
960
log_error(USE_ERRNO|NO_EXIT, _("unable to open %s"), sudoers);
963
* Make sure we can actually read sudoers so we can present the
964
* user with a reasonable error message (unlike the lexer).
966
if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
967
log_error(USE_ERRNO|NO_EXIT, _("unable to read %s"), sudoers);
975
(void) fcntl(fileno(fp), F_SETFD, 1);
978
restore_perms(); /* change back to root */
982
#ifdef HAVE_LOGIN_CAP_H
984
set_loginclass(struct passwd *pw)
989
* Don't make it a fatal error if the user didn't specify the login
990
* class themselves. We do this because if login.conf gets
991
* corrupted we want the admin to be able to use sudo to fix it.
994
errflags = NO_MAIL|MSG_ONLY;
996
errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
998
if (login_class && strcmp(login_class, "-") != 0) {
1000
strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1001
errorx(1, _("only root can use `-c %s'"), login_class);
1003
login_class = pw->pw_class;
1004
if (!login_class || !*login_class)
1006
(pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1009
lc = login_getclass(login_class);
1010
if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1011
log_error(errflags, _("unknown login class: %s"), login_class);
1013
lc = login_getclass(NULL); /* needed for login_getstyle() later */
1018
set_loginclass(struct passwd *pw)
1021
#endif /* HAVE_LOGIN_CAP_H */
1024
* Look up the fully qualified domain name and set user_host and user_shost.
1029
#ifdef HAVE_GETADDRINFO
1030
struct addrinfo *res0, hint;
1036
#ifdef HAVE_GETADDRINFO
1037
zero_bytes(&hint, sizeof(hint));
1038
hint.ai_family = PF_UNSPEC;
1039
hint.ai_flags = AI_CANONNAME;
1040
if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1042
if (!(hp = gethostbyname(user_host))) {
1044
log_error(MSG_ONLY|NO_EXIT,
1045
_("unable to resolve host %s"), user_host);
1047
if (user_shost != user_host)
1050
#ifdef HAVE_GETADDRINFO
1051
user_host = estrdup(res0->ai_canonname);
1054
user_host = estrdup(hp->h_name);
1057
if ((p = strchr(user_host, '.')) != NULL)
1058
user_shost = estrndup(user_host, (size_t)(p - user_host));
1060
user_shost = user_host;
1064
* Get passwd entry for the user we are going to run commands as
1065
* and store it in runas_pw. By default, commands run as "root".
1068
set_runaspw(const char *user)
1070
if (runas_pw != NULL)
1071
pw_delref(runas_pw);
1073
if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1074
runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1076
if ((runas_pw = sudo_getpwnam(user)) == NULL)
1077
log_error(NO_MAIL|MSG_ONLY, _("unknown user: %s"), user);
1082
* Get group entry for the group we are going to run commands as
1083
* and store it in runas_gr.
1086
set_runasgr(const char *group)
1088
if (runas_gr != NULL)
1089
gr_delref(runas_gr);
1090
if (*group == '#') {
1091
if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1092
runas_gr = sudo_fakegrnam(group);
1094
if ((runas_gr = sudo_getgrnam(group)) == NULL)
1095
log_error(NO_MAIL|MSG_ONLY, _("unknown group: %s"), group);
1100
* Callback for runas_default sudoers setting.
1103
cb_runas_default(const char *user)
1105
/* Only reset runaspw if user didn't specify one. */
1106
if (!runas_user && !runas_group)
1112
* Cleanup hook for error()/errorx()
1115
plugin_cleanup(int gotsignal)
1117
struct sudo_nss *nss;
1121
tq_foreach_fwd(snl, nss)
1124
if (def_group_plugin)
1125
group_plugin_unload();
1132
sudoers_policy_version(int verbose)
1134
if (sigsetjmp(error_jmp, 1)) {
1135
/* error recovery via error(), errorx() or log_error() */
1139
sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers policy plugin version %s\n"),
1141
sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers file grammar version %d\n"),
1142
SUDOERS_GRAMMAR_VERSION);
1145
sudo_printf(SUDO_CONV_INFO_MSG, _("\nSudoers path: %s\n"), sudoers_file);
1147
# ifdef _PATH_NSSWITCH_CONF
1148
sudo_printf(SUDO_CONV_INFO_MSG, _("nsswitch path: %s\n"), _PATH_NSSWITCH_CONF);
1150
sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.conf path: %s\n"), _PATH_LDAP_CONF);
1151
sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.secret path: %s\n"), _PATH_LDAP_SECRET);
1153
dump_auth_methods();
1155
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
1156
dump_interfaces(interfaces_string);
1157
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
1163
deserialize_info(char * const settings[], char * const user_info[])
1166
const char *p, *groups = NULL;
1169
#define MATCHES(s, v) (strncmp(s, v, sizeof(v) - 1) == 0)
1171
/* Parse command line settings. */
1172
user_closefrom = -1;
1173
for (cur = settings; *cur != NULL; cur++) {
1174
if (MATCHES(*cur, "closefrom=")) {
1175
user_closefrom = atoi(*cur + sizeof("closefrom=") - 1);
1178
if (MATCHES(*cur, "debug_level=")) {
1179
debug_level = atoi(*cur + sizeof("debug_level=") - 1);
1182
if (MATCHES(*cur, "runas_user=")) {
1183
runas_user = *cur + sizeof("runas_user=") - 1;
1186
if (MATCHES(*cur, "runas_group=")) {
1187
runas_group = *cur + sizeof("runas_group=") - 1;
1190
if (MATCHES(*cur, "prompt=")) {
1191
user_prompt = *cur + sizeof("prompt=") - 1;
1192
def_passprompt_override = TRUE;
1195
if (MATCHES(*cur, "set_home=")) {
1196
if (atobool(*cur + sizeof("set_home=") - 1) == TRUE)
1197
SET(flags, MODE_RESET_HOME);
1200
if (MATCHES(*cur, "preserve_environment=")) {
1201
if (atobool(*cur + sizeof("preserve_environment=") - 1) == TRUE)
1202
SET(flags, MODE_PRESERVE_ENV);
1205
if (MATCHES(*cur, "run_shell=")) {
1206
if (atobool(*cur + sizeof("run_shell=") - 1) == TRUE)
1207
SET(flags, MODE_SHELL);
1210
if (MATCHES(*cur, "login_shell=")) {
1211
if (atobool(*cur + sizeof("login_shell=") - 1) == TRUE) {
1212
SET(flags, MODE_LOGIN_SHELL);
1213
def_env_reset = TRUE;
1217
if (MATCHES(*cur, "implied_shell=")) {
1218
if (atobool(*cur + sizeof("implied_shell=") - 1) == TRUE)
1219
SET(flags, MODE_IMPLIED_SHELL);
1222
if (MATCHES(*cur, "preserve_groups=")) {
1223
if (atobool(*cur + sizeof("preserve_groups=") - 1) == TRUE)
1224
SET(flags, MODE_PRESERVE_GROUPS);
1227
if (MATCHES(*cur, "ignore_ticket=")) {
1228
if (atobool(*cur + sizeof("ignore_ticket=") - 1) == TRUE)
1229
SET(flags, MODE_IGNORE_TICKET);
1232
if (MATCHES(*cur, "noninteractive=")) {
1233
if (atobool(*cur + sizeof("noninteractive=") - 1) == TRUE)
1234
SET(flags, MODE_NONINTERACTIVE);
1237
if (MATCHES(*cur, "sudoedit=")) {
1238
if (atobool(*cur + sizeof("sudoedit=") - 1) == TRUE)
1239
SET(flags, MODE_EDIT);
1242
if (MATCHES(*cur, "login_class=")) {
1243
login_class = *cur + sizeof("login_class=") - 1;
1244
def_use_loginclass = TRUE;
1248
if (MATCHES(*cur, "selinux_role=")) {
1249
user_role = *cur + sizeof("selinux_role=") - 1;
1252
if (MATCHES(*cur, "selinux_type=")) {
1253
user_type = *cur + sizeof("selinux_type=") - 1;
1256
#endif /* HAVE_SELINUX */
1257
#ifdef HAVE_BSD_AUTH_H
1258
if (MATCHES(*cur, "bsdauth_type=")) {
1259
login_style = *cur + sizeof("bsdauth_type=") - 1;
1262
#endif /* HAVE_BSD_AUTH_H */
1263
#if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
1264
if (MATCHES(*cur, "progname=")) {
1265
setprogname(*cur + sizeof("progname=") - 1);
1269
if (MATCHES(*cur, "network_addrs=")) {
1270
interfaces_string = *cur + sizeof("network_addrs=") - 1;
1271
set_interfaces(interfaces_string);
1274
if (MATCHES(*cur, "sudoers_file=")) {
1275
sudoers_file = *cur + sizeof("sudoers_file=") - 1;
1278
if (MATCHES(*cur, "sudoers_uid=")) {
1279
sudoers_uid = (uid_t) atoi(*cur + sizeof("sudoers_uid=") - 1);
1282
if (MATCHES(*cur, "sudoers_gid=")) {
1283
sudoers_gid = (gid_t) atoi(*cur + sizeof("sudoers_gid=") - 1);
1286
if (MATCHES(*cur, "sudoers_mode=")) {
1287
sudoers_mode = (mode_t) strtol(*cur + sizeof("sudoers_mode=") - 1,
1293
for (cur = user_info; *cur != NULL; cur++) {
1294
if (MATCHES(*cur, "user=")) {
1295
user_name = estrdup(*cur + sizeof("user=") - 1);
1298
if (MATCHES(*cur, "uid=")) {
1299
user_uid = (uid_t) atoi(*cur + sizeof("uid=") - 1);
1302
if (MATCHES(*cur, "gid=")) {
1303
p = *cur + sizeof("gid=") - 1;
1304
user_gid = (gid_t) atoi(p);
1307
if (MATCHES(*cur, "groups=")) {
1308
groups = *cur + sizeof("groups=") - 1;
1311
if (MATCHES(*cur, "cwd=")) {
1312
user_cwd = estrdup(*cur + sizeof("cwd=") - 1);
1315
if (MATCHES(*cur, "tty=")) {
1316
user_tty = user_ttypath = estrdup(*cur + sizeof("tty=") - 1);
1317
if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
1318
user_tty += sizeof(_PATH_DEV) - 1;
1321
if (MATCHES(*cur, "host=")) {
1322
user_host = user_shost = estrdup(*cur + sizeof("host=") - 1);
1323
if ((p = strchr(user_host, '.')))
1324
user_shost = estrndup(user_host, (size_t)(p - user_host));
1327
if (MATCHES(*cur, "lines=")) {
1328
sudo_user.lines = atoi(*cur + sizeof("lines=") - 1);
1331
if (MATCHES(*cur, "cols=")) {
1332
sudo_user.cols = atoi(*cur + sizeof("cols=") - 1);
1336
if (user_cwd == NULL)
1337
user_cwd = "unknown";
1338
if (user_tty == NULL)
1339
user_tty = "unknown"; /* user_ttypath remains NULL */
1341
if (groups != NULL && groups[0] != '\0') {
1346
/* Count number of groups, including passwd gid. */
1348
for (cp = groups; *cp != '\0'; cp++) {
1353
/* The first gid in the list is the passwd group gid. */
1354
gids = emalloc2(ngids, sizeof(GETGROUPS_T));
1359
gids[ngids] = atoi(cp);
1360
if (gids[0] != gids[ngids])
1362
cp = strchr(cp, ',');
1365
cp++; /* skip over comma */
1367
set_group_list(user_name, gids, ngids);
1376
resolve_editor(char *editor, int nfiles, char **files, char ***argv_out)
1378
char *cp, **nargv, *editor_path = NULL;
1379
int ac, i, nargc, wasblank;
1381
editor = estrdup(editor); /* becomes part of argv_out */
1384
* Split editor into an argument vector; editor is reused (do not free).
1385
* The EDITOR and VISUAL environment variables may contain command
1386
* line args so look for those and alloc space for them too.
1389
for (wasblank = FALSE, cp = editor; *cp != '\0'; cp++) {
1390
if (isblank((unsigned char) *cp))
1392
else if (wasblank) {
1397
/* If we can't find the editor in the user's PATH, give up. */
1398
cp = strtok(editor, " \t");
1400
find_path(cp, &editor_path, NULL, getenv("PATH"), 0) != FOUND) {
1404
nargv = (char **) emalloc2(nargc + 1 + nfiles + 1, sizeof(char *));
1405
for (ac = 0; cp != NULL && ac < nargc; ac++) {
1407
cp = strtok(NULL, " \t");
1410
for (i = 0; i < nfiles; )
1411
nargv[ac++] = files[i++];
1419
* Determine which editor to use. We don't need to worry about restricting
1420
* this to a "safe" editor since it runs with the uid of the invoking user,
1421
* not the runas (privileged) user.
1424
find_editor(int nfiles, char **files, char ***argv_out)
1426
char *cp, *editor, *editor_path = NULL, **ev, *ev0[4];
1429
* If any of SUDO_EDITOR, VISUAL or EDITOR are set, choose the first one.
1431
ev0[0] = "SUDO_EDITOR";
1435
for (ev = ev0; *ev != NULL; ev++) {
1436
if ((editor = getenv(*ev)) != NULL && *editor != '\0') {
1437
editor_path = resolve_editor(editor, nfiles, files, argv_out);
1438
if (editor_path != NULL)
1442
if (editor_path == NULL) {
1443
/* def_editor could be a path, split it up */
1444
editor = estrdup(def_editor);
1445
cp = strtok(editor, ":");
1446
while (cp != NULL && editor_path == NULL) {
1447
editor_path = resolve_editor(cp, nfiles, files, argv_out);
1448
cp = strtok(NULL, ":");
1454
audit_failure(NewArgv, _("%s: command not found"), editor);
1455
warningx(_("%s: command not found"), editor);
1460
#ifdef USE_ADMIN_FLAG
1462
create_admin_success_flag(void)
1464
struct stat statbuf;
1465
char flagfile[PATH_MAX];
1468
/* Check whether the user is in the admin group. */
1469
if (!user_in_group(sudo_user.pw, "admin"))
1472
/* Build path to flag file. */
1473
n = snprintf(flagfile, sizeof(flagfile), "%s/.sudo_as_admin_successful",
1475
if (n <= 0 || n >= sizeof(flagfile))
1478
/* Create admin flag file if it doesn't already exist. */
1479
set_perms(PERM_USER);
1480
if (stat(flagfile, &statbuf) != 0) {
1481
fd = open(flagfile, O_CREAT|O_WRONLY|O_EXCL, 0644);
1486
#else /* !USE_ADMIN_FLAG */
1488
create_admin_success_flag(void)
1492
#endif /* USE_ADMIN_FLAG */
1494
struct policy_plugin sudoers_policy = {
1497
sudoers_policy_open,
1498
sudoers_policy_close,
1499
sudoers_policy_version,
1500
sudoers_policy_check,
1501
sudoers_policy_list,
1502
sudoers_policy_validate,
1503
sudoers_policy_invalidate,
1504
sudoers_policy_init_session