mirrors
/
sudo
mirror of https://github.com/sudo-project/sudo.git
0
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
sudo/plugins/sudoers/sudoers.c

1583 lines
44 KiB
C
Raw Permalink Blame History

/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1993-1996, 1998-2023 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <netdb.h>
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
# ifndef LOGIN_DEFROOTCLASS
# define LOGIN_DEFROOTCLASS "daemon"
# endif
# ifndef LOGIN_SETENV
# define LOGIN_SETENV 0
# endif
#endif
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
#endif
#include <ctype.h>
#ifndef HAVE_GETADDRINFO
# include <compat/getaddrinfo.h>
#endif
#include <sudoers.h>
#include <timestamp.h>
#include <sudo_iolog.h>
/*
* Prototypes
*/
static int set_cmnd(struct sudoers_context *ctx);
static bool init_vars(struct sudoers_context *ctx, char * const *);
static bool set_loginclass(struct sudoers_context *);
static bool set_runaspw(struct sudoers_context *ctx, const char *, bool);
static bool set_runasgr(struct sudoers_context *ctx, const char *, bool);
/*
* Globals
*/
static char *prev_user;
static struct sudoers_context sudoers_ctx = SUDOERS_CONTEXT_INITIALIZER;
static struct sudo_nss_list *snl;
static bool unknown_runas_uid;
static bool unknown_runas_gid;
static int cmnd_status = NOT_FOUND_ERROR;
static struct defaults_list initial_defaults = TAILQ_HEAD_INITIALIZER(initial_defaults);
#ifdef __linux__
static struct rlimit nproclimit;
#endif
#ifdef SUDOERS_LOG_CLIENT
# define remote_iologs (!SLIST_EMPTY(&def_log_servers))
#else
# define remote_iologs 0
#endif
/*
* Unlimit the number of processes since Linux's setuid() will
* apply resource limits when changing uid and return EAGAIN if
* nproc would be exceeded by the uid switch.
*/
static void
unlimit_nproc(void)
{
#ifdef __linux__
struct rlimit rl;
debug_decl(unlimit_nproc, SUDOERS_DEBUG_UTIL);
if (getrlimit(RLIMIT_NPROC, &nproclimit) != 0)
sudo_warn("getrlimit(RLIMIT_NPROC)");
rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_NPROC, &rl) != 0) {
rl.rlim_cur = rl.rlim_max = nproclimit.rlim_max;
if (setrlimit(RLIMIT_NPROC, &rl) != 0)
sudo_warn("setrlimit(RLIMIT_NPROC)");
}
debug_return;
#endif /* __linux__ */
}
/*
* Restore saved value of RLIMIT_NPROC.
*/
static void
restore_nproc(void)
{
#ifdef __linux__
debug_decl(restore_nproc, SUDOERS_DEBUG_UTIL);
if (setrlimit(RLIMIT_NPROC, &nproclimit) != 0)
sudo_warn("setrlimit(RLIMIT_NPROC)");
debug_return;
#endif /* __linux__ */
}
/*
* Re-initialize Defaults settings.
* We do not warn, log or send mail for errors when reinitializing,
* this would have already been done the first time through.
*/
static bool
sudoers_reinit_defaults(struct sudoers_context *ctx)
{
struct sudo_nss *nss, *nss_next;
sudoers_logger_t logger = sudoers_error_hook;
debug_decl(sudoers_reinit_defaults, SUDOERS_DEBUG_PLUGIN);
if (!init_defaults()) {
sudo_warnx("%s", U_("unable to initialize sudoers default values"));
debug_return_bool(false);
}
/* It should not be possible for the initial defaults to fail to apply. */
if (!update_defaults(ctx, NULL, &initial_defaults,
SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false))
debug_return_bool(false);
/* Disable error logging while re-processing defaults. */
sudoers_error_hook = NULL;
TAILQ_FOREACH_SAFE(nss, snl, entries, nss_next) {
/* Missing/invalid defaults is not a fatal error. */
if (nss->getdefs(ctx, nss) != -1) {
(void)update_defaults(ctx, nss->parse_tree, NULL,
SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, true);
}
}
/* Restore error logging. */
sudoers_error_hook = logger;
/* No need to check the admin flag file multiple times. */
if (ISSET(ctx->mode, MODE_POLICY_INTERCEPTED)) {
free(def_admin_flag);
def_admin_flag = NULL;
}
debug_return_bool(true);
}
int
sudoers_init(void *info, sudoers_logger_t logger, char * const envp[])
{
struct sudo_nss *nss, *nss_next;
int oldlocale, sources = 0;
static int ret = -1;
debug_decl(sudoers_init, SUDOERS_DEBUG_PLUGIN);
/* Only initialize once. */
if (snl != NULL)
debug_return_int(ret);
bindtextdomain("sudoers", LOCALEDIR);
/* Hook up logging function for parse errors. */
sudoers_error_hook = logger;
/* Register fatal/fatalx callback. */
sudo_fatal_callback_register(sudoers_cleanup);
/* Initialize environment functions (including replacements). */
if (!env_init(envp))
debug_return_int(-1);
/* Setup defaults data structures. */
if (!init_defaults()) {
sudo_warnx("%s", U_("unable to initialize sudoers default values"));
debug_return_int(-1);
}
/* Parse info from front-end. */
sudoers_ctx.mode = sudoers_policy_deserialize_info(&sudoers_ctx, info,
&initial_defaults);
if (ISSET(sudoers_ctx.mode, MODE_ERROR))
debug_return_int(-1);
if (!init_vars(&sudoers_ctx, envp))
debug_return_int(-1);
/* Parse nsswitch.conf for sudoers order. */
snl = sudo_read_nss();
/* LDAP or NSS may modify the euid so we need to be root for the open. */
if (!set_perms(NULL, PERM_ROOT))
debug_return_int(-1);
/* Use the C locale unless another is specified in sudoers. */
sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
sudo_warn_set_locale_func(sudoers_warn_setlocale);
/* Update defaults set by front-end. */
if (!update_defaults(&sudoers_ctx, NULL, &initial_defaults,
SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false)) {
goto cleanup;
}
/* Open and parse sudoers, set global defaults. */
TAILQ_FOREACH_SAFE(nss, snl, entries, nss_next) {
if (nss->open(&sudoers_ctx, nss) == -1 || (nss->parse_tree = nss->parse(&sudoers_ctx, nss)) == NULL) {
TAILQ_REMOVE(snl, nss, entries);
continue;
}
sources++;
/* Missing/invalid defaults is not a fatal error. */
if (nss->getdefs(&sudoers_ctx, nss) == -1) {
log_warningx(&sudoers_ctx, SLOG_PARSE_ERROR|SLOG_NO_STDERR,
N_("unable to get defaults from %s"), nss->source);
} else {
(void)update_defaults(&sudoers_ctx, nss->parse_tree, NULL,
SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false);
}
}
if (sources == 0) {
/* Display an extra warning if there are multiple sudoers sources. */
if (TAILQ_FIRST(snl) != TAILQ_LAST(snl, sudo_nss_list))
sudo_warnx("%s", U_("no valid sudoers sources found, quitting"));
goto cleanup;
}
/* Set login class if applicable (after sudoers is parsed). */
if (set_loginclass(&sudoers_ctx))
ret = true;
cleanup:
mail_parse_errors(&sudoers_ctx);
if (!restore_perms())
ret = -1;
/* Restore user's locale. */
sudo_warn_set_locale_func(NULL);
sudoers_setlocale(oldlocale, NULL);
debug_return_int(ret);
}
/*
* Expand I/O log dir and file into a full path.
* Returns the full I/O log path prefixed with "iolog_path=".
* Sets ctx->iolog_file and ctx->iolog_path as a side effect.
*/
static char *
format_iolog_path(struct sudoers_context *ctx)
{
char dir[PATH_MAX], file[PATH_MAX];
char *iolog_path = NULL;
int oldlocale;
bool ok;
debug_decl(format_iolog_path, SUDOERS_DEBUG_PLUGIN);
/* Use sudoers locale for strftime() */
sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
ok = expand_iolog_path(def_iolog_dir, dir, sizeof(dir),
&sudoers_iolog_path_escapes[1], ctx);
if (ok) {
ctx->iolog_dir = dir;
ok = expand_iolog_path(def_iolog_file, file, sizeof(file),
&sudoers_iolog_path_escapes[0], ctx);
ctx->iolog_dir = NULL;
}
sudoers_setlocale(oldlocale, NULL);
if (!ok)
goto done;
if (asprintf(&iolog_path, "iolog_path=%s/%s", dir, file) == -1) {
iolog_path = NULL;
goto done;
}
/* Stash pointer to the I/O log for the event log. */
ctx->iolog_path = iolog_path + sizeof("iolog_path=") - 1;
ctx->iolog_file = ctx->iolog_path + 1 + strlen(dir);
done:
debug_return_str(iolog_path);
}
static void
cb_lookup(const struct sudoers_parse_tree *parse_tree,
const struct userspec *us, int user_match, const struct privilege *priv,
int host_match, const struct cmndspec *cs, int date_match, int runas_match,
int cmnd_match, void *closure)
{
struct sudoers_match_info *info = closure;
if (cmnd_match != UNSPEC) {
info->us = us;
info->priv = priv;
info->cs = cs;
}
}
/*
* Find the command, perform a sudoers lookup, ask for a password as
* needed, and perform post-lookup checks. Logs success/failure.
* This is used by the check, list and validate plugin methods.
*
* Returns true if allowed, false if denied, -1 on error and
* -2 for usage error.
*/
static int
sudoers_check_common(struct sudoers_context *ctx, int pwflag)
{
struct sudoers_match_info match_info = { NULL };
int oldlocale, ret = -1;
unsigned int validated;
time_t now;
debug_decl(sudoers_check_common, SUDOERS_DEBUG_PLUGIN);
/* If given the -P option, set the "preserve_groups" flag. */
if (ISSET(ctx->mode, MODE_PRESERVE_GROUPS))
def_preserve_groups = true;
/* Find command in path and apply per-command Defaults. */
cmnd_status = set_cmnd(ctx);
if (cmnd_status == NOT_FOUND_ERROR)
goto done;
/* Is root even allowed to run sudo? */
if (ctx->user.uid == 0 && !def_root_sudo) {
/* Not an audit event (should it be?). */
sudo_warnx("%s",
U_("sudoers specifies that root is not allowed to sudo"));
ret = false;
goto done;
}
/* Check for -C overriding def_closefrom. */
if (ctx->user.closefrom >= 0 && ctx->user.closefrom != def_closefrom) {
if (!def_closefrom_override) {
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT,
N_("user not allowed to override closefrom limit"));
sudo_warnx("%s", U_("you are not permitted to use the -C option"));
goto bad;
}
def_closefrom = ctx->user.closefrom;
}
/*
* Check sudoers sources, using the locale specified in sudoers.
*/
time(&now);
sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
validated = sudoers_lookup(snl, ctx, now, cb_lookup, &match_info,
&cmnd_status, pwflag);
sudoers_setlocale(oldlocale, NULL);
if (ISSET(validated, VALIDATE_ERROR)) {
/* The lookup function should have printed an error. */
goto done;
}
if (match_info.us != NULL && match_info.us->file != NULL) {
free(ctx->source);
if (match_info.us->line != 0) {
if (asprintf(&ctx->source, "%s:%d:%d", match_info.us->file,
match_info.us->line, match_info.us->column) == -1)
ctx->source = NULL;
} else {
ctx->source = strdup(match_info.us->file);
}
if (ctx->source == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
}
if (ctx->runas.cmnd == NULL) {
if ((ctx->runas.cmnd = strdup(ctx->user.cmnd)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
}
/* Defer uid/gid checks until after defaults have been updated. */
if (unknown_runas_uid && !def_runas_allow_unknown_id) {
log_warningx(ctx, SLOG_AUDIT, N_("unknown user %s"),
ctx->runas.pw->pw_name);
goto done;
}
if (ctx->runas.gr != NULL) {
if (unknown_runas_gid && !def_runas_allow_unknown_id) {
log_warningx(ctx, SLOG_AUDIT, N_("unknown group %s"),
ctx->runas.gr->gr_name);
goto done;
}
}
/* If no command line args and "shell_noargs" is not set, error out. */
if (ISSET(ctx->mode, MODE_IMPLIED_SHELL) && !def_shell_noargs) {
/* Not an audit event. */
ret = -2; /* usage error */
goto done;
}
/* Bail if a tty is required and we don't have one. */
if (def_requiretty && !sudoers_tty_present(ctx)) {
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT, N_("no tty"));
sudo_warnx("%s", U_("sorry, you must have a tty to run sudo"));
goto bad;
}
/* Check runas user's shell if running (or checking) a command. */
if (ISSET(ctx->mode, MODE_RUN|MODE_CHECK)) {
if (!user_shell_valid(ctx->runas.pw)) {
log_warningx(ctx, SLOG_RAW_MSG|SLOG_AUDIT,
N_("invalid shell for user %s: %s"),
ctx->runas.pw->pw_name, ctx->runas.pw->pw_shell);
goto bad;
}
}
/*
* We don't reset the environment for sudoedit or if the user
* specified the -E command line flag and they have setenv privs.
*/
if (ISSET(ctx->mode, MODE_EDIT) ||
(ISSET(ctx->mode, MODE_PRESERVE_ENV) && def_setenv))
def_env_reset = false;
/* Build a new environment that avoids any nasty bits. */
if (!rebuild_env(ctx))
goto bad;
/* Require a password if sudoers says so. */
switch (check_user(ctx, validated, ctx->mode)) {
case AUTH_SUCCESS:
/* user authenticated successfully. */
break;
case AUTH_FAILURE:
/* Note: log_denial() calls audit for us. */
if (!ISSET(validated, VALIDATE_SUCCESS)) {
/* Only display a denial message if no password was read. */
if (!log_denial(ctx, validated, def_passwd_tries <= 0))
goto done;
}
goto bad;
default:
/* some other error, ret is -1. */
goto done;
}
/* Check whether ctx->runas.chroot is permitted (if specified). */
switch (check_user_runchroot(ctx->runas.chroot)) {
case true:
break;
case false:
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT,
N_("user not allowed to change root directory to %s"),
ctx->runas.chroot);
sudo_warnx(U_("you are not permitted to use the -R option with %s"),
ctx->user.cmnd);
goto bad;
default:
goto done;
}
/* Check whether ctx->runas.cwd is permitted (if specified). */
switch (check_user_runcwd(ctx->runas.cwd)) {
case true:
break;
case false:
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT,
N_("user not allowed to change directory to %s"), ctx->runas.cwd);
sudo_warnx(U_("you are not permitted to use the -D option with %s"),
ctx->user.cmnd);
goto bad;
default:
goto done;
}
/* If run as root with SUDO_USER set, set ctx->user.pw to that user. */
/* XXX - causes confusion when root is not listed in sudoers */
if (ISSET(ctx->mode, MODE_RUN|MODE_EDIT) && prev_user != NULL) {
if (ctx->user.uid == 0 && strcmp(prev_user, "root") != 0) {
struct passwd *pw;
if ((pw = sudo_getpwnam(prev_user)) != NULL) {
if (ctx->user.pw != NULL)
sudo_pw_delref(ctx->user.pw);
ctx->user.pw = pw;
}
}
}
/* If the user was not allowed to run the command we are done. */
if (!ISSET(validated, VALIDATE_SUCCESS)) {
/* Note: log_failure() calls audit for us. */
if (!log_failure(ctx, validated, cmnd_status))
goto done;
goto bad;
}
/*
* Check if the user is trying to run a setid binary in intercept mode.
* For the DSO intercept_type, we reject attempts to run setid binaries
* by default since the dynamic loader will clear LD_PRELOAD, defeating
* intercept.
*/
if (def_intercept || ISSET(ctx->mode, MODE_POLICY_INTERCEPTED)) {
if (!def_intercept_allow_setid && ctx->user.cmnd_stat != NULL) {
if (ISSET(ctx->user.cmnd_stat->st_mode, S_ISUID|S_ISGID)) {
CLR(validated, VALIDATE_SUCCESS);
if (!log_denial(ctx, validated|FLAG_INTERCEPT_SETID, true))
goto done;
goto bad;
}
}
}
/* Create Ubuntu-style dot file to indicate sudo was successful. */
if (create_admin_success_flag(ctx) == -1)
goto done;
/* Finally tell the user if the command did not exist. */
if (cmnd_status == NOT_FOUND_DOT) {
audit_failure(ctx, ctx->runas.argv, N_("command in current directory"));
sudo_warnx(U_("ignoring \"%s\" found in '.'\nUse \"sudo ./%s\" if this is the \"%s\" you wish to run."), ctx->user.cmnd, ctx->user.cmnd, ctx->user.cmnd);
goto bad;
} else if (cmnd_status == NOT_FOUND) {
if (ISSET(ctx->mode, MODE_CHECK)) {
audit_failure(ctx, ctx->runas.argv, N_("%s: command not found"),
ctx->runas.argv[1]);
sudo_warnx(U_("%s: command not found"), ctx->runas.argv[1]);
} else {
audit_failure(ctx, ctx->runas.argv, N_("%s: command not found"),
ctx->user.cmnd);
sudo_warnx(U_("%s: command not found"), ctx->user.cmnd);
if (strncmp(ctx->user.cmnd, "cd", 2) == 0 && (ctx->user.cmnd[2] == '\0' ||
isblank((unsigned char)ctx->user.cmnd[2]))) {
sudo_warnx("%s",
U_("\"cd\" is a shell built-in command, it cannot be run directly."));
sudo_warnx("%s",
U_("the -s option may be used to run a privileged shell."));
sudo_warnx("%s",
U_("the -D option may be used to run a command in a specific directory."));
}
}
goto bad;
}
/* If user specified a timeout make sure sudoers allows it. */
if (!def_user_command_timeouts && ctx->user.timeout > 0) {
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT,
N_("user not allowed to set a command timeout"));
sudo_warnx("%s",
U_("sorry, you are not allowed set a command timeout"));
goto bad;
}
/* If user specified env vars make sure sudoers allows it. */
if (ISSET(ctx->mode, MODE_RUN) && !def_setenv) {
if (ISSET(ctx->mode, MODE_PRESERVE_ENV)) {
log_warningx(ctx, SLOG_NO_STDERR|SLOG_AUDIT,
N_("user not allowed to preserve the environment"));
sudo_warnx("%s",
U_("sorry, you are not allowed to preserve the environment"));
goto bad;
} else {
if (!validate_env_vars(ctx, ctx->user.env_add))
goto bad;
}
}
ret = true;
goto done;
bad:
ret = false;
done:
debug_return_int(ret);
}
static bool need_reinit;
/*
* Check whether the user is allowed to run the specified command.
* Returns true if allowed, false if denied, -1 on error and
* -2 for usage error.
*/
int
sudoers_check_cmnd(int argc, char * const argv[], char *env_add[],
void *closure)
{
char *iolog_path = NULL;
mode_t cmnd_umask = ACCESSPERMS;
int ret = -1;
debug_decl(sudoers_check_cmnd, SUDOERS_DEBUG_PLUGIN);
sudo_warn_set_locale_func(sudoers_warn_setlocale);
if (argc == 0) {
sudo_warnx("%s", U_("no command specified"));
debug_return_int(-1);
}
if (need_reinit) {
/* Was previous command intercepted? */
if (ISSET(sudoers_ctx.mode, MODE_RUN) && def_intercept)
SET(sudoers_ctx.mode, MODE_POLICY_INTERCEPTED);
/* Only certain mode flags are legal for intercepted commands. */
if (ISSET(sudoers_ctx.mode, MODE_POLICY_INTERCEPTED))
sudoers_ctx.mode &= MODE_INTERCEPT_MASK;
/* Re-initialize defaults if we are called multiple times. */
if (!sudoers_reinit_defaults(&sudoers_ctx))
debug_return_int(-1);
}
need_reinit = true;
unlimit_nproc();
if (!set_perms(&sudoers_ctx, PERM_INITIAL))
goto bad;
/* Environment variables specified on the command line. */
if (env_add != NULL && env_add[0] != NULL)
sudoers_ctx.user.env_add = env_add;
/*
* Make a local copy of argc/argv, with special handling for the
* '-i' option. We also allocate an extra slot for bash's --login.
*/
if (sudoers_ctx.runas.argv != NULL && sudoers_ctx.runas.argv != sudoers_ctx.runas.argv_saved) {
sudoers_gc_remove(GC_PTR, sudoers_ctx.runas.argv);
free(sudoers_ctx.runas.argv);
}
sudoers_ctx.runas.argv = reallocarray(NULL, (size_t)argc + 2, sizeof(char *));
if (sudoers_ctx.runas.argv == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto error;
}
sudoers_gc_add(GC_PTR, sudoers_ctx.runas.argv);
memcpy(sudoers_ctx.runas.argv, argv, (size_t)argc * sizeof(char *));
sudoers_ctx.runas.argc = argc;
sudoers_ctx.runas.argv[sudoers_ctx.runas.argc] = NULL;
if (ISSET(sudoers_ctx.mode, MODE_LOGIN_SHELL) && sudoers_ctx.runas.pw != NULL) {
sudoers_ctx.runas.argv[0] = strdup(sudoers_ctx.runas.pw->pw_shell);
if (sudoers_ctx.runas.argv[0] == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto error;
}
sudoers_gc_add(GC_PTR, sudoers_ctx.runas.argv[0]);
}
ret = sudoers_check_common(&sudoers_ctx, 0);
if (ret != true)
goto done;
if (!remote_iologs) {
if (iolog_enabled && def_iolog_file && def_iolog_dir) {
if ((iolog_path = format_iolog_path(&sudoers_ctx)) == NULL) {
if (!def_ignore_iolog_errors)
goto error;
/* Unable to expand I/O log path, disable I/O logging. */
def_log_input = false;
def_log_output = false;
def_log_stdin = false;
def_log_stdout = false;
def_log_stderr = false;
def_log_ttyin = false;
def_log_ttyout = false;
}
}
}
/*
* Set umask based on sudoers.
* If user's umask is more restrictive, OR in those bits too
* unless umask_override is set.
*/
if (def_umask != ACCESSPERMS) {
cmnd_umask = def_umask;
if (!def_umask_override)
cmnd_umask |= sudoers_ctx.user.umask;
}
if (ISSET(sudoers_ctx.mode, MODE_LOGIN_SHELL)) {
char *p;
/* Convert /bin/sh -> -sh so shell knows it is a login shell */
if ((p = strrchr(sudoers_ctx.runas.argv[0], '/')) == NULL)
p = sudoers_ctx.runas.argv[0];
*p = '-';
sudoers_ctx.runas.argv[0] = p;
/*
* Newer versions of bash require the --login option to be used
* in conjunction with the -c option even if the shell name starts
* with a '-'. Unfortunately, bash 1.x uses -login, not --login
* so this will cause an error for that.
*/
if (sudoers_ctx.runas.argc > 1 && strcmp(sudoers_ctx.runas.argv[0], "-bash") == 0 &&
strcmp(sudoers_ctx.runas.argv[1], "-c") == 0) {
/* We allocated extra space for the --login above. */
memmove(&sudoers_ctx.runas.argv[2], &sudoers_ctx.runas.argv[1],
(size_t)sudoers_ctx.runas.argc * sizeof(char *));
sudoers_ctx.runas.argv[1] = (char *)"--login";
sudoers_ctx.runas.argc++;
}
#ifdef _PATH_ENVIRONMENT
/* Insert system-wide environment variables. */
if (!read_env_file(&sudoers_ctx, _PATH_ENVIRONMENT, true, false))
sudo_warn("%s", _PATH_ENVIRONMENT);
#endif
#ifdef HAVE_LOGIN_CAP_H
/* Set environment based on login class. */
if (sudoers_ctx.runas.class) {
login_cap_t *lc = login_getclass(sudoers_ctx.runas.class);
if (lc != NULL) {
setusercontext(lc, sudoers_ctx.runas.pw,
sudoers_ctx.runas.pw->pw_uid, LOGIN_SETPATH|LOGIN_SETENV);
login_close(lc);
}
}
#endif /* HAVE_LOGIN_CAP_H */
}
/* Insert system-wide environment variables. */
if (def_restricted_env_file) {
if (!read_env_file(&sudoers_ctx, def_restricted_env_file, false, true))
sudo_warn("%s", def_restricted_env_file);
}
if (def_env_file) {
if (!read_env_file(&sudoers_ctx, def_env_file, false, false))
sudo_warn("%s", def_env_file);
}
/* Insert user-specified environment variables. */
if (!insert_env_vars(sudoers_ctx.user.env_add)) {
sudo_warnx("%s",
U_("error setting user-specified environment variables"));
goto error;
}
/* Note: must call audit before uid change. */
if (ISSET(sudoers_ctx.mode, MODE_EDIT)) {
const char *env_editor = NULL;
char **edit_argv;
int edit_argc;
sudoers_ctx.sudoedit_nfiles = sudoers_ctx.runas.argc - 1;
free(sudoers_ctx.runas.cmnd);
sudoers_ctx.runas.cmnd = find_editor(sudoers_ctx.sudoedit_nfiles,
sudoers_ctx.runas.argv + 1, &edit_argc, &edit_argv, NULL, &env_editor);
if (sudoers_ctx.runas.cmnd == NULL) {
switch (errno) {
case ENOENT:
audit_failure(&sudoers_ctx, sudoers_ctx.runas.argv,
N_("%s: command not found"),
env_editor ? env_editor : def_editor);
sudo_warnx(U_("%s: command not found"),
env_editor ? env_editor : def_editor);
goto error;
case EINVAL:
if (def_env_editor && env_editor != NULL) {
/* User tried to do something funny with the editor. */
log_warningx(&sudoers_ctx,
SLOG_NO_STDERR|SLOG_AUDIT|SLOG_SEND_MAIL,
"invalid user-specified editor: %s", env_editor);
goto error;
}
FALLTHROUGH;
default:
goto error;
}
}
/* find_editor() already g/c'd edit_argv[] */
if (sudoers_ctx.runas.argv != sudoers_ctx.runas.argv_saved) {
sudoers_gc_remove(GC_PTR, sudoers_ctx.runas.argv);
free(sudoers_ctx.runas.argv);
}
sudoers_ctx.runas.argv = edit_argv;
sudoers_ctx.runas.argc = edit_argc;
/* We want to run the editor with the unmodified environment. */
env_swap_old();
}
/* Save the initial command and argv so we have it for exit logging. */
if (sudoers_ctx.runas.cmnd_saved == NULL) {
sudoers_ctx.runas.cmnd_saved = strdup(sudoers_ctx.runas.cmnd);
if (sudoers_ctx.runas.cmnd_saved == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto error;
}
sudoers_ctx.runas.argv_saved = sudoers_ctx.runas.argv;
}
ret = true;
goto done;
bad:
ret = false;
goto done;
error:
ret = -1;
done:
mail_parse_errors(&sudoers_ctx);
if (def_group_plugin)
group_plugin_unload();
reset_parser();
if (ret == -1) {
/* Free locally-allocated strings. */
free(iolog_path);
} else {
/* Store settings to pass back to front-end. */
if (!sudoers_policy_store_result(&sudoers_ctx, ret,
sudoers_ctx.runas.argv, env_get(), cmnd_umask, iolog_path, closure))
ret = -1;
}
/* Zero out stashed copy of environment, it is owned by the front-end. */
(void)env_init(NULL);
if (!rewind_perms())
ret = -1;
restore_nproc();
sudo_warn_set_locale_func(NULL);
debug_return_int(ret);
}
/*
* Validate the user and update their timestamp file entry.
* Returns true if allowed, false if denied, -1 on error and
* -2 for usage error.
*/
int
sudoers_validate_user(void)
{
int ret = -1;
debug_decl(sudoers_validate_user, SUDOERS_DEBUG_PLUGIN);
sudo_warn_set_locale_func(sudoers_warn_setlocale);
unlimit_nproc();
if (!set_perms(&sudoers_ctx, PERM_INITIAL))
goto done;
sudoers_ctx.runas.argv = reallocarray(NULL, 2, sizeof(char *));
if (sudoers_ctx.runas.argv == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
sudoers_gc_add(GC_PTR, sudoers_ctx.runas.argv);
sudoers_ctx.runas.argv[0] = (char *)"validate";
sudoers_ctx.runas.argv[1] = NULL;
sudoers_ctx.runas.argc = 2;
ret = sudoers_check_common(&sudoers_ctx, I_VERIFYPW);
done:
mail_parse_errors(&sudoers_ctx);
if (def_group_plugin)
group_plugin_unload();
reset_parser();
env_init(NULL);
if (!rewind_perms())
ret = -1;
restore_nproc();
sudo_warn_set_locale_func(NULL);
debug_return_int(ret);
}
/*
* List a user's privileges or check whether a specific command may be run.
* Returns true if allowed, false if denied, -1 on error and
* -2 for usage error.
*/
int
sudoers_list(int argc, char * const argv[], const char *list_user, int verbose)
{
struct passwd *pw;
int ret = -1;
debug_decl(sudoers_list, SUDOERS_DEBUG_PLUGIN);
sudo_warn_set_locale_func(sudoers_warn_setlocale);
unlimit_nproc();
if (!set_perms(&sudoers_ctx, PERM_INITIAL))
goto done;
if (list_user) {
if (sudoers_ctx.runas.list_pw != NULL)
sudo_pw_delref(sudoers_ctx.runas.list_pw);
sudoers_ctx.runas.list_pw = sudo_getpwnam(list_user);
if (sudoers_ctx.runas.list_pw == NULL) {
sudo_warnx(U_("unknown user %s"), list_user);
goto done;
}
}
sudoers_ctx.runas.argv = reallocarray(NULL, (size_t)argc + 2, sizeof(char *));
if (sudoers_ctx.runas.argv == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
sudoers_gc_add(GC_PTR, sudoers_ctx.runas.argv);
sudoers_ctx.runas.argv[0] = (char *)"list";
if (argc != 0)
memcpy(sudoers_ctx.runas.argv + 1, argv, (size_t)argc * sizeof(char *));
sudoers_ctx.runas.argc = argc + 1;
sudoers_ctx.runas.argv[sudoers_ctx.runas.argc] = NULL;
ret = sudoers_check_common(&sudoers_ctx, I_LISTPW);
if (ret != true)
goto done;
pw = sudoers_ctx.runas.list_pw ? sudoers_ctx.runas.list_pw : sudoers_ctx.user.pw;
if (ISSET(sudoers_ctx.mode, MODE_CHECK))
ret = display_cmnd(&sudoers_ctx, snl, pw, verbose);
else
ret = display_privs(&sudoers_ctx, snl, pw, verbose);
done:
mail_parse_errors(&sudoers_ctx);
if (def_group_plugin)
group_plugin_unload();
reset_parser();
env_init(NULL);
if (!rewind_perms())
ret = -1;
restore_nproc();
sudo_warn_set_locale_func(NULL);
debug_return_int(ret);
}
/*
* Initialize timezone and fill in ctx->user.
*/
static bool
init_vars(struct sudoers_context *ctx, char * const envp[])
{
char * const * ep;
bool unknown_user = false;
debug_decl(init_vars, SUDOERS_DEBUG_PLUGIN);
if (!sudoers_initlocale(setlocale(LC_ALL, NULL), def_sudoers_locale)) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_bool(false);
}
#define MATCHES(s, v) \
(strncmp((s), (v), sizeof(v) - 1) == 0 && (s)[sizeof(v) - 1] != '\0')
ctx->user.envp = envp;
for (ep = ctx->user.envp; *ep; ep++) {
switch (**ep) {
case 'K':
if (MATCHES(*ep, "KRB5CCNAME="))
ctx->user.ccname = *ep + sizeof("KRB5CCNAME=") - 1;
break;
case 'P':
if (MATCHES(*ep, "PATH="))
ctx->user.path = *ep + sizeof("PATH=") - 1;
break;
case 'S':
if (MATCHES(*ep, "SUDO_PROMPT=")) {
/* Don't override "sudo -p prompt" */
if (ctx->user.prompt == NULL)
ctx->user.prompt = *ep + sizeof("SUDO_PROMPT=") - 1;
break;
}
if (MATCHES(*ep, "SUDO_USER="))
prev_user = *ep + sizeof("SUDO_USER=") - 1;
break;
}
}
#undef MATCHES
if (ctx->user.pw == NULL) {
/* Fake a struct passwd for the call to log_warningx(). */
ctx->user.pw = sudo_mkpwent(ctx->user.name, ctx->user.uid,
ctx->user.gid, NULL, NULL);
unknown_user = true;
}
if (ctx->user.gid_list == NULL)
ctx->user.gid_list = sudo_get_gidlist(ctx->user.pw, ENTRY_TYPE_ANY);
/* Store initialize permissions so we can restore them later. */
if (!set_perms(ctx, PERM_INITIAL))
debug_return_bool(false);
/* Set parse callbacks */
set_callbacks();
/* It is now safe to use log_warningx() and set_perms() */
if (unknown_user) {
log_warningx(ctx, SLOG_SEND_MAIL, N_("unknown user %s"), ctx->user.name);
debug_return_bool(false);
}
/*
* Set runas passwd/group entries based on command line or sudoers.
* Note that if runas_group was specified without runas_user we
* run the command as the invoking user.
*/
if (ctx->runas.group != NULL) {
if (!set_runasgr(ctx, ctx->runas.group, false))
debug_return_bool(false);
if (!set_runaspw(ctx, ctx->runas.user ?
ctx->runas.user : ctx->user.name, false))
debug_return_bool(false);
} else {
if (!set_runaspw(ctx, ctx->runas.user ?
ctx->runas.user : def_runas_default, false))
debug_return_bool(false);
}
debug_return_bool(true);
}
/*
* Fill in ctx->user.cmnd and ctx->user.cmnd_stat variables.
* Does not fill in ctx->user.cmnd_base.
*/
int
set_cmnd_path(struct sudoers_context *ctx, const char *runchroot)
{
struct sudoers_pivot pivot_state = SUDOERS_PIVOT_INITIALIZER;
const char *cmnd_in;
char *cmnd_out = NULL;
char *path = ctx->user.path;
int ret;
debug_decl(set_cmnd_path, SUDOERS_DEBUG_PLUGIN);
cmnd_in = ISSET(ctx->mode, MODE_CHECK) ?
ctx->runas.argv[1] : ctx->runas.argv[0];
free(ctx->user.cmnd_list);
ctx->user.cmnd_list = NULL;
free(ctx->user.cmnd);
ctx->user.cmnd = NULL;
canon_path_free(ctx->user.cmnd_dir);
ctx->user.cmnd_dir = NULL;
if (def_secure_path && !user_is_exempt(ctx))
path = def_secure_path;
/* Pivot root. */
if (runchroot != NULL) {
if (!pivot_root(runchroot, &pivot_state))
goto error;
}
ret = resolve_cmnd(ctx, cmnd_in, &cmnd_out, path);
if (ret == FOUND) {
char *slash = strrchr(cmnd_out, '/');
if (slash != NULL) {
*slash = '\0';
ctx->user.cmnd_dir = canon_path(cmnd_out);
if (ctx->user.cmnd_dir == NULL && errno == ENOMEM)
goto error;
*slash = '/';
}
}
if (ISSET(ctx->mode, MODE_CHECK))
ctx->user.cmnd_list = cmnd_out;
else
ctx->user.cmnd = cmnd_out;
/* Restore root. */
if (runchroot != NULL)
(void)unpivot_root(&pivot_state);
debug_return_int(ret);
error:
if (runchroot != NULL)
(void)unpivot_root(&pivot_state);
free(cmnd_out);
debug_return_int(NOT_FOUND_ERROR);
}
/*
* Fill in ctx->user.cmnd, ctx->user.cmnd_stat and cmnd_status variables.
* Does not fill in ctx->user.cmnd_base.
*/
void
set_cmnd_status(struct sudoers_context *ctx, const char *runchroot)
{
cmnd_status = set_cmnd_path(ctx, runchroot);
}
/*
* Fill in ctx->user.cmnd, ctx->user.cmnd_args, ctx->user.cmnd_base and
* ctx->user.cmnd_stat variables and apply any command-specific defaults entries.
*/
static int
set_cmnd(struct sudoers_context *ctx)
{
struct sudo_nss *nss;
int ret = FOUND;
debug_decl(set_cmnd, SUDOERS_DEBUG_PLUGIN);
/* Allocate ctx->user.cmnd_stat for find_path() and match functions. */
free(ctx->user.cmnd_stat);
ctx->user.cmnd_stat = calloc(1, sizeof(struct stat));
if (ctx->user.cmnd_stat == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_int(NOT_FOUND_ERROR);
}
/* Re-initialize for when we are called multiple times. */
free(ctx->runas.cmnd);
ctx->runas.cmnd = NULL;
if (ISSET(ctx->mode, MODE_RUN|MODE_EDIT|MODE_CHECK)) {
if (!ISSET(ctx->mode, MODE_EDIT)) {
const char *runchroot = ctx->runas.chroot;
if (runchroot == NULL && def_runchroot != NULL &&
strcmp(def_runchroot, "*") != 0)
runchroot = def_runchroot;
ret = set_cmnd_path(ctx, runchroot);
if (ret == NOT_FOUND_ERROR) {
if (errno == ENAMETOOLONG) {
audit_failure(ctx, ctx->runas.argv, N_("command too long"));
}
log_warning(ctx, 0, "%s", ctx->runas.argv[0]);
debug_return_int(ret);
}
}
/* set ctx->user.cmnd_args */
free(ctx->user.cmnd_args);
ctx->user.cmnd_args = NULL;
if (ISSET(ctx->mode, MODE_CHECK)) {
if (ctx->runas.argc > 2) {
/* Skip the command being listed in ctx->runas.argv[1]. */
ctx->user.cmnd_args = strvec_join(ctx->runas.argv + 2, ' ', NULL);
if (ctx->user.cmnd_args == NULL)
debug_return_int(NOT_FOUND_ERROR);
}
} else if (ctx->runas.argc > 1) {
if (ISSET(ctx->mode, MODE_SHELL|MODE_LOGIN_SHELL) &&
ISSET(ctx->mode, MODE_RUN)) {
/*
* When running a command via a shell, the sudo front-end
* escapes potential meta chars. We unescape non-spaces
* for sudoers matching and logging purposes.
* TODO: move escaping to the policy plugin instead
*/
ctx->user.cmnd_args = strvec_join(ctx->runas.argv + 1, ' ',
strlcpy_unescape);
} else {
ctx->user.cmnd_args = strvec_join(ctx->runas.argv + 1, ' ',
NULL);
}
if (ctx->user.cmnd_args == NULL)
debug_return_int(NOT_FOUND_ERROR);
}
}
if (ctx->user.cmnd == NULL) {
ctx->user.cmnd = strdup(ctx->runas.argv[0]);
if (ctx->user.cmnd == NULL)
debug_return_int(NOT_FOUND_ERROR);
}
ctx->user.cmnd_base = sudo_basename(ctx->user.cmnd);
/* Convert "sudo sudoedit" -> "sudoedit" */
if (ISSET(ctx->mode, MODE_RUN) && strcmp(ctx->user.cmnd_base, "sudoedit") == 0) {
char *new_cmnd;
CLR(ctx->mode, MODE_RUN);
SET(ctx->mode, MODE_EDIT);
sudo_warnx("%s", U_("sudoedit doesn't need to be run via sudo"));
if ((new_cmnd = strdup("sudoedit")) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_int(NOT_FOUND_ERROR);
}
free(ctx->user.cmnd);
ctx->user.cmnd_base = ctx->user.cmnd = new_cmnd;
}
TAILQ_FOREACH(nss, snl, entries) {
/* Missing/invalid defaults is not a fatal error. */
(void)update_defaults(ctx, nss->parse_tree, NULL, SETDEF_CMND, false);
}
debug_return_int(ret);
}
static int
open_file(const char *path, int flags)
{
int fd;
debug_decl(open_file, SUDOERS_DEBUG_PLUGIN);
if (!set_perms(NULL, PERM_SUDOERS))
debug_return_int(-1);
fd = open(path, flags);
if (fd == -1 && errno == EACCES && geteuid() != ROOT_UID) {
/*
* If we tried to open sudoers as non-root but got EACCES,
* try again as root.
*/
int serrno = errno;
if (restore_perms() && set_perms(NULL, PERM_ROOT))
fd = open(path, flags);
errno = serrno;
}
if (!restore_perms()) {
/* unable to change back to root */
if (fd != -1) {
close(fd);
fd = -1;
}
}
debug_return_int(fd);
}
/*
* Open sudoers file and check mode/owner/type.
* Returns a handle to the sudoers file or NULL on error.
*/
FILE *
open_sudoers(const char *path, char **outfile, bool doedit, bool *keepopen)
{
char fname[PATH_MAX];
FILE *fp = NULL;
struct stat sb;
int error, fd;
debug_decl(open_sudoers, SUDOERS_DEBUG_PLUGIN);
fd = sudo_open_conf_path(path, fname, sizeof(fname), open_file);
if (sudoers_ctx.parser_conf.ignore_perms) {
/* Skip sudoers security checks when ignore_perms is set. */
if (fd == -1 || fstat(fd, &sb) == -1)
error = SUDO_PATH_MISSING;
else
error = SUDO_PATH_SECURE;
} else {
error = sudo_secure_fd(fd, S_IFREG, sudoers_file_uid(),
sudoers_file_gid(), &sb);
}
switch (error) {
case SUDO_PATH_SECURE:
/*
* Make sure we can read the file so we can present the
* user with a reasonable error message (unlike the lexer).
*/
if ((fp = fdopen(fd, "r")) == NULL) {
log_warning(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("unable to open %s"), fname);
} else {
fd = -1;
if (sb.st_size != 0 && fgetc(fp) == EOF) {
log_warning(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("unable to read %s"), fname);
fclose(fp);
fp = NULL;
} else {
/* Rewind fp and set close on exec flag. */
rewind(fp);
(void)fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
if (outfile != NULL) {
*outfile = sudo_rcstr_dup(fname);
if (*outfile == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
fclose(fp);
fp = NULL;
}
}
}
}
break;
case SUDO_PATH_MISSING:
log_warning(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("unable to open %s"), path);
break;
case SUDO_PATH_BAD_TYPE:
log_warningx(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("%s is not a regular file"), fname);
break;
case SUDO_PATH_WRONG_OWNER:
log_warningx(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("%s is owned by uid %u, should be %u"), fname,
(unsigned int)sb.st_uid, (unsigned int)sudoers_file_uid());
break;
case SUDO_PATH_WORLD_WRITABLE:
log_warningx(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("%s is world writable"), fname);
break;
case SUDO_PATH_GROUP_WRITABLE:
log_warningx(&sudoers_ctx, SLOG_PARSE_ERROR,
N_("%s is owned by gid %u, should be %u"), fname,
(unsigned int)sb.st_gid, (unsigned int)sudoers_file_gid());
break;
default:
sudo_warnx("%s: internal error, unexpected error %d", __func__, error);
break;
}
if (fp == NULL && fd != -1)
close(fd);
debug_return_ptr(fp);
}
#ifdef HAVE_LOGIN_CAP_H
static bool
set_loginclass(struct sudoers_context *ctx)
{
const struct passwd *pw = ctx->runas.pw ? ctx->runas.pw : ctx->user.pw;
const unsigned int errflags = SLOG_RAW_MSG;
login_cap_t *lc;
bool ret = true;
debug_decl(set_loginclass, SUDOERS_DEBUG_PLUGIN);
if (!def_use_loginclass)
goto done;
if (ctx->runas.class && strcmp(ctx->runas.class, "-") != 0) {
if (ctx->user.uid != 0 && pw->pw_uid != 0) {
sudo_warnx(U_("only root can use \"-c %s\""), ctx->runas.class);
ret = false;
goto done;
}
} else {
ctx->runas.class = pw->pw_class;
if (!ctx->runas.class || !*ctx->runas.class)
ctx->runas.class = (char *)
((pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS);
}
/* Make sure specified login class is valid. */
lc = login_getclass(ctx->runas.class);
if (!lc || !lc->lc_class || strcmp(lc->lc_class, ctx->runas.class) != 0) {
/*
* Don't make it an error if the user didn't specify the login
* class themselves. We do this because if login.conf gets
* corrupted we want the admin to be able to use sudo to fix it.
*/
log_warningx(ctx, errflags, N_("unknown login class %s"),
ctx->runas.class);
def_use_loginclass = false;
if (ctx->runas.class)
ret = false;
}
login_close(lc);
done:
debug_return_bool(ret);
}
#else
static bool
set_loginclass(struct sudoers_context *ctx)
{
return true;
}
#endif /* HAVE_LOGIN_CAP_H */
/*
* Get passwd entry for the user we are going to run commands as
* and store it in ctx->runas.pw. By default, commands run as "root".
*/
static bool
set_runaspw(struct sudoers_context *ctx, const char *user, bool quiet)
{
struct passwd *pw = NULL;
debug_decl(set_runaspw, SUDOERS_DEBUG_PLUGIN);
unknown_runas_uid = false;
if (*user == '#') {
const char *errstr;
uid_t uid = sudo_strtoid(user + 1, &errstr);
if (errstr == NULL) {
if ((pw = sudo_getpwuid(uid)) == NULL) {
unknown_runas_uid = true;
pw = sudo_fakepwnam(user, ctx->user.gid);
}
}
}
if (pw == NULL) {
if ((pw = sudo_getpwnam(user)) == NULL) {
if (!quiet)
log_warningx(ctx, SLOG_AUDIT, N_("unknown user %s"), user);
debug_return_bool(false);
}
}
if (ctx->runas.pw != NULL)
sudo_pw_delref(ctx->runas.pw);
ctx->runas.pw = pw;
debug_return_bool(true);
}
/*
* Get group entry for the group we are going to run commands as
* and store it in ctx->runas.gr.
*/
static bool
set_runasgr(struct sudoers_context *ctx, const char *group, bool quiet)
{
struct group *gr = NULL;
debug_decl(set_runasgr, SUDOERS_DEBUG_PLUGIN);
unknown_runas_gid = false;
if (*group == '#') {
const char *errstr;
gid_t gid = sudo_strtoid(group + 1, &errstr);
if (errstr == NULL) {
if ((gr = sudo_getgrgid(gid)) == NULL) {
unknown_runas_gid = true;
gr = sudo_fakegrnam(group);
}
}
}
if (gr == NULL) {
if ((gr = sudo_getgrnam(group)) == NULL) {
if (!quiet)
log_warningx(ctx, SLOG_AUDIT, N_("unknown group %s"), group);
debug_return_bool(false);
}
}
if (ctx->runas.gr != NULL)
sudo_gr_delref(ctx->runas.gr);
ctx->runas.gr = gr;
debug_return_bool(true);
}
/*
* Callback for runas_default sudoers setting.
*/
bool
cb_runas_default(struct sudoers_context *ctx, const char *file, int line,
int column, const union sudo_defs_val *sd_un, int op)
{
debug_decl(cb_runas_default, SUDOERS_DEBUG_PLUGIN);
/* Only reset runaspw if user didn't specify one. */
if (ctx->runas.user == NULL && ctx->runas.group == NULL)
debug_return_bool(set_runaspw(ctx, sd_un->str, true));
debug_return_bool(true);
}
/*
* Cleanup hook for sudo_fatal()/sudo_fatalx()
* Also called at policy close time.
*/
void
sudoers_cleanup(void)
{
struct sudo_nss *nss;
struct defaults *def;
debug_decl(sudoers_cleanup, SUDOERS_DEBUG_PLUGIN);
if (snl != NULL) {
TAILQ_FOREACH(nss, snl, entries) {
nss->close(&sudoers_ctx, nss);
}
snl = NULL;
reset_parser();
}
while ((def = TAILQ_FIRST(&initial_defaults)) != NULL) {
TAILQ_REMOVE(&initial_defaults, def, entries);
free(def->var);
free(def->val);
free(def);
}
need_reinit = false;
if (def_group_plugin)
group_plugin_unload();
sudoers_ctx_free(&sudoers_ctx);
sudo_freepwcache();
sudo_freegrcache();
canon_path_free_cache();
/* We must free the cached environment before running g/c. */
env_free();
/* Run garbage collector. */
sudoers_gc_run();
/* Clear globals */
prev_user = NULL;
debug_return;
}
bool
sudoers_set_mode(unsigned int flags, unsigned int mask)
{
SET(sudoers_ctx.mode, flags);
return ((sudoers_ctx.mode & mask) == sudoers_ctx.mode);
}
const struct sudoers_context *
sudoers_get_context(void)
{
return &sudoers_ctx;
}
bool
sudoers_set_log_format(enum def_tuple tuple)
{
enum eventlog_format format;
debug_decl(cb_log_format, SUDOERS_DEBUG_PLUGIN);
/* FFR - make "json" an alias for EVLOG_JSON_COMPACT instead. */
switch (tuple) {
case json_compact:
format = EVLOG_JSON_COMPACT;
break;
case json:
case json_pretty:
format = EVLOG_JSON_PRETTY;
break;
case sudo:
format = EVLOG_SUDO;
break;
default:
debug_return_bool(false);
}
eventlog_set_format(format);
debug_return_bool(true);
}
Reference in New Issue View Git Blame Copy Permalink