/*
* Copyright (c) 1996, 1998-2005, 2007-2012
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_FNMATCH
# include <fnmatch.h>
#endif /* HAVE_FNMATCH */
#ifdef HAVE_GLOB
# include <glob.h>
#endif /* HAVE_GLOB */
#ifdef HAVE_NETGROUP_H
# include <netgroup.h>
#endif /* HAVE_NETGROUP_H */
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <netdb.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
#include "sudoers.h"
#include "parse.h"
#include <gram.h>
#ifndef HAVE_FNMATCH
# include "compat/fnmatch.h"
#endif /* HAVE_FNMATCH */
#ifndef HAVE_GLOB
# include "compat/glob.h"
#endif /* HAVE_GLOB */
static struct member_list empty;
static bool command_matches_dir(char *, size_t);
static bool command_matches_glob(char *, char *);
static bool command_matches_fnmatch(char *, char *);
static bool command_matches_normal(char *, char *);
/*
* Returns true if string 's' contains meta characters.
*/
#define has_meta(s) (strpbrk(s, "\\?*[]") != NULL)
/*
* Check for user described by pw in a list of members.
* Returns ALLOW, DENY or UNSPEC.
*/
static int
_userlist_matches(struct passwd *pw, struct member_list *list)
{
struct member *m;
struct alias *a;
int rval, matched = UNSPEC;
debug_decl(_userlist_matches, SUDO_DEBUG_MATCH)
tq_foreach_rev(list, m) {
switch (m->type) {
case ALL:
matched = !m->negated;
break;
case NETGROUP:
if (netgr_matches(m->name, NULL, NULL, pw->pw_name))
matched = !m->negated;
break;
case USERGROUP:
if (usergr_matches(m->name, pw->pw_name, pw))
matched = !m->negated;
break;
case ALIAS:
if ((a = alias_find(m->name, USERALIAS)) != NULL) {
rval = _userlist_matches(pw, &a->members);
if (rval != UNSPEC)
matched = m->negated ? !rval : rval;
break;
}
/* FALLTHROUGH */
case WORD:
if (userpw_matches(m->name, pw->pw_name, pw))
matched = !m->negated;
break;
}
if (matched != UNSPEC)
break;
}
debug_return_bool(matched);
}
int
userlist_matches(struct passwd *pw, struct member_list *list)
{
alias_seqno++;
return _userlist_matches(pw, list);
}
/*
* Check for user described by pw in a list of members.
* If both lists are empty compare against def_runas_default.
* Returns ALLOW, DENY or UNSPEC.
*/
static int
_runaslist_matches(struct member_list *user_list, struct member_list *group_list)
{
struct member *m;
struct alias *a;
int rval;
int user_matched = UNSPEC;
int group_matched = UNSPEC;
debug_decl(_runaslist_matches, SUDO_DEBUG_MATCH)
if (runas_pw != NULL) {
/* If no runas user or runas group listed in sudoers, use default. */
if (tq_empty(user_list) && tq_empty(group_list))
debug_return_int(userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw));
tq_foreach_rev(user_list, m) {
switch (m->type) {
case ALL:
user_matched = !m->negated;
break;
case NETGROUP:
if (netgr_matches(m->name, NULL, NULL, runas_pw->pw_name))
user_matched = !m->negated;
break;
case USERGROUP:
if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
user_matched = !m->negated;
break;
case ALIAS:
if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
rval = _runaslist_matches(&a->members, &empty);
if (rval != UNSPEC)
user_matched = m->negated ? !rval : rval;
break;
}
/* FALLTHROUGH */
case WORD:
if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
user_matched = !m->negated;
break;
}
if (user_matched != UNSPEC)
break;
}
}
if (runas_gr != NULL) {
if (user_matched == UNSPEC) {
if (runas_pw == NULL || strcmp(runas_pw->pw_name, user_name) == 0)
user_matched = ALLOW; /* only changing group */
}
tq_foreach_rev(group_list, m) {
switch (m->type) {
case ALL:
group_matched = !m->negated;
break;
case ALIAS:
if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
rval = _runaslist_matches(&empty, &a->members);
if (rval != UNSPEC)
group_matched = m->negated ? !rval : rval;
break;
}
/* FALLTHROUGH */
case WORD:
if (group_matches(m->name, runas_gr))
group_matched = !m->negated;
break;
}
if (group_matched != UNSPEC)
break;
}
if (group_matched == UNSPEC) {
if (runas_pw != NULL && runas_pw->pw_gid == runas_gr->gr_gid)
group_matched = ALLOW; /* runas group matches passwd db */
}
}
if (user_matched == DENY || group_matched == DENY)
debug_return_int(DENY);
if (user_matched == group_matched || runas_gr == NULL)
debug_return_int(user_matched);
debug_return_int(UNSPEC);
}
int
runaslist_matches(struct member_list *user_list, struct member_list *group_list)
{
alias_seqno++;
return _runaslist_matches(user_list ? user_list : &empty,
group_list ? group_list : &empty);
}
/*
* Check for host and shost in a list of members.
* Returns ALLOW, DENY or UNSPEC.
*/
static int
_hostlist_matches(struct member_list *list)
{
struct member *m;
struct alias *a;
int rval, matched = UNSPEC;
debug_decl(_hostlist_matches, SUDO_DEBUG_MATCH)
tq_foreach_rev(list, m) {
switch (m->type) {
case ALL:
matched = !m->negated;
break;
case NETGROUP:
if (netgr_matches(m->name, user_host, user_shost, NULL))
matched = !m->negated;
break;
case NTWKADDR:
if (addr_matches(m->name))
matched = !m->negated;
break;
case ALIAS:
if ((a = alias_find(m->name, HOSTALIAS)) != NULL) {
rval = _hostlist_matches(&a->members);
if (rval != UNSPEC)
matched = m->negated ? !rval : rval;
break;
}
/* FALLTHROUGH */
case WORD:
if (hostname_matches(user_shost, user_host, m->name))
matched = !m->negated;
break;
}
if (matched != UNSPEC)
break;
}
debug_return_bool(matched);
}
int
hostlist_matches(struct member_list *list)
{
alias_seqno++;
return _hostlist_matches(list);
}
/*
* Check for cmnd and args in a list of members.
* Returns ALLOW, DENY or UNSPEC.
*/
static int
_cmndlist_matches(struct member_list *list)
{
struct member *m;
int matched = UNSPEC;
debug_decl(_cmndlist_matches, SUDO_DEBUG_MATCH)
tq_foreach_rev(list, m) {
matched = cmnd_matches(m);
if (matched != UNSPEC)
break;
}
debug_return_bool(matched);
}
int
cmndlist_matches(struct member_list *list)
{
alias_seqno++;
return _cmndlist_matches(list);
}
/*
* Check cmnd and args.
* Returns ALLOW, DENY or UNSPEC.
*/
int
cmnd_matches(struct member *m)
{
struct alias *a;
struct sudo_command *c;
int rval, matched = UNSPEC;
debug_decl(cmnd_matches, SUDO_DEBUG_MATCH)
switch (m->type) {
case ALL:
matched = !m->negated;
break;
case ALIAS:
alias_seqno++;
if ((a = alias_find(m->name, CMNDALIAS)) != NULL) {
rval = _cmndlist_matches(&a->members);
if (rval != UNSPEC)
matched = m->negated ? !rval : rval;
}
break;
case COMMAND:
c = (struct sudo_command *)m->name;
if (command_matches(c->cmnd, c->args))
matched = !m->negated;
break;
}
debug_return_bool(matched);
}
static bool
command_args_match(sudoers_cmnd, sudoers_args)
char *sudoers_cmnd;
char *sudoers_args;
{
int flags = 0;
debug_decl(command_args_match, SUDO_DEBUG_MATCH)
/*
* If no args specified in sudoers, any user args are allowed.
* If the empty string is specified in sudoers, no user args are allowed.
*/
if (!sudoers_args ||
(!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)))
debug_return_bool(true);
/*
* If args are specified in sudoers, they must match the user args.
* If running as sudoedit, all args are assumed to be paths.
*/
if (sudoers_args) {
/* For sudoedit, all args are assumed to be pathnames. */
if (strcmp(sudoers_cmnd, "sudoedit") == 0)
flags = FNM_PATHNAME;
if (fnmatch(sudoers_args, user_args ? user_args : "", flags) == 0)
debug_return_bool(true);
}
debug_return_bool(false);
}
/*
* If path doesn't end in /, return true iff cmnd & path name the same inode;
* otherwise, return true if user_cmnd names one of the inodes in path.
*/
bool
command_matches(char *sudoers_cmnd, char *sudoers_args)
{
debug_decl(command_matches, SUDO_DEBUG_MATCH)
/* Check for pseudo-commands */
if (sudoers_cmnd[0] != '/') {
/*
* Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none req by sudoers OR
* c) there are args in sudoers and on command line and they match
*/
if (strcmp(sudoers_cmnd, "sudoedit") != 0 ||
strcmp(user_cmnd, "sudoedit") != 0)
debug_return_bool(false);
if (command_args_match(sudoers_cmnd, sudoers_args)) {
efree(safe_cmnd);
safe_cmnd = estrdup(sudoers_cmnd);
debug_return_bool(true);
} else
debug_return_bool(false);
}
if (has_meta(sudoers_cmnd)) {
/*
* If sudoers_cmnd has meta characters in it, we need to
* use glob(3) and/or fnmatch(3) to do the matching.
*/
if (def_fast_glob)
debug_return_bool(command_matches_fnmatch(sudoers_cmnd, sudoers_args));
debug_return_bool(command_matches_glob(sudoers_cmnd, sudoers_args));
}
debug_return_bool(command_matches_normal(sudoers_cmnd, sudoers_args));
}
static bool
command_matches_fnmatch(char *sudoers_cmnd, char *sudoers_args)
{
debug_decl(command_matches_fnmatch, SUDO_DEBUG_MATCH)
/*
* Return true if fnmatch(3) succeeds AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none required by sudoers OR
* c) there are args in sudoers and on command line and they match
* else return false.
*/
if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
debug_return_bool(false);
if (command_args_match(sudoers_cmnd, sudoers_args)) {
if (safe_cmnd)
free(safe_cmnd);
safe_cmnd = estrdup(user_cmnd);
debug_return_bool(true);
}
debug_return_bool(false);
}
static bool
command_matches_glob(char *sudoers_cmnd, char *sudoers_args)
{
struct stat sudoers_stat;
size_t dlen;
char **ap, *base, *cp;
glob_t gl;
debug_decl(command_matches_glob, SUDO_DEBUG_MATCH)
/*
* First check to see if we can avoid the call to glob(3).
* Short circuit if there are no meta chars in the command itself
* and user_base and basename(sudoers_cmnd) don't match.
*/
dlen = strlen(sudoers_cmnd);
if (sudoers_cmnd[dlen - 1] != '/') {
if ((base = strrchr(sudoers_cmnd, '/')) != NULL) {
base++;
if (!has_meta(base) && strcmp(user_base, base) != 0)
debug_return_bool(false);
}
}
/*
* Return true if we find a match in the glob(3) results AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none required by sudoers OR
* c) there are args in sudoers and on command line and they match
* else return false.
*/
if (glob(sudoers_cmnd, GLOB_NOSORT, NULL, &gl) != 0 || gl.gl_pathc == 0) {
globfree(&gl);
debug_return_bool(false);
}
/* For each glob match, compare basename, st_dev and st_ino. */
for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) {
/* If it ends in '/' it is a directory spec. */
dlen = strlen(cp);
if (cp[dlen - 1] == '/') {
if (command_matches_dir(cp, dlen))
debug_return_bool(true);
continue;
}
/* Only proceed if user_base and basename(cp) match */
if ((base = strrchr(cp, '/')) != NULL)
base++;
else
base = cp;
if (strcmp(user_base, base) != 0 ||
stat(cp, &sudoers_stat) == -1)
continue;
if (user_stat == NULL ||
(user_stat->st_dev == sudoers_stat.st_dev &&
user_stat->st_ino == sudoers_stat.st_ino)) {
efree(safe_cmnd);
safe_cmnd = estrdup(cp);
break;
}
}
globfree(&gl);
if (cp == NULL)
debug_return_bool(false);
if (command_args_match(sudoers_cmnd, sudoers_args)) {
efree(safe_cmnd);
safe_cmnd = estrdup(user_cmnd);
debug_return_bool(true);
}
debug_return_bool(false);
}
static bool
command_matches_normal(char *sudoers_cmnd, char *sudoers_args)
{
struct stat sudoers_stat;
char *base;
size_t dlen;
debug_decl(command_matches_normal, SUDO_DEBUG_MATCH)
/* If it ends in '/' it is a directory spec. */
dlen = strlen(sudoers_cmnd);
if (sudoers_cmnd[dlen - 1] == '/')
debug_return_bool(command_matches_dir(sudoers_cmnd, dlen));
/* Only proceed if user_base and basename(sudoers_cmnd) match */
if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
base = sudoers_cmnd;
else
base++;
if (strcmp(user_base, base) != 0 ||
stat(sudoers_cmnd, &sudoers_stat) == -1)
debug_return_bool(false);
/*
* Return true if inode/device matches AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none req by sudoers OR
* c) there are args in sudoers and on command line and they match
*/
if (user_stat != NULL &&
(user_stat->st_dev != sudoers_stat.st_dev ||
user_stat->st_ino != sudoers_stat.st_ino))
debug_return_bool(false);
if (command_args_match(sudoers_cmnd, sudoers_args)) {
efree(safe_cmnd);
safe_cmnd = estrdup(sudoers_cmnd);
debug_return_bool(true);
}
debug_return_bool(false);
}
/*
* Return true if user_cmnd names one of the inodes in dir, else false.
*/
static bool
command_matches_dir(char *sudoers_dir, size_t dlen)
{
struct stat sudoers_stat;
struct dirent *dent;
char buf[PATH_MAX];
DIR *dirp;
debug_decl(command_matches_dir, SUDO_DEBUG_MATCH)
/*
* Grot through directory entries, looking for user_base.
*/
dirp = opendir(sudoers_dir);
if (dirp == NULL)
debug_return_bool(false);
if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
closedir(dirp);
debug_return_bool(false);
}
while ((dent = readdir(dirp)) != NULL) {
/* ignore paths > PATH_MAX (XXX - log) */
buf[dlen] = '\0';
if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
continue;
/* only stat if basenames are the same */
if (strcmp(user_base, dent->d_name) != 0 ||
stat(buf, &sudoers_stat) == -1)
continue;
if (user_stat == NULL ||
(user_stat->st_dev == sudoers_stat.st_dev &&
user_stat->st_ino == sudoers_stat.st_ino)) {
efree(safe_cmnd);
safe_cmnd = estrdup(buf);
break;
}
}
closedir(dirp);
debug_return_bool(dent != NULL);
}
/*
* Returns true if the hostname matches the pattern, else false
*/
bool
hostname_matches(char *shost, char *lhost, char *pattern)
{
debug_decl(hostname_matches, SUDO_DEBUG_MATCH)
if (has_meta(pattern)) {
if (strchr(pattern, '.'))
debug_return_bool(!fnmatch(pattern, lhost, FNM_CASEFOLD));
else
debug_return_bool(!fnmatch(pattern, shost, FNM_CASEFOLD));
} else {
if (strchr(pattern, '.'))
debug_return_bool(!strcasecmp(lhost, pattern));
else
debug_return_bool(!strcasecmp(shost, pattern));
}
}
/*
* Returns true if the user/uid from sudoers matches the specified user/uid,
* else returns false.
*/
bool
userpw_matches(char *sudoers_user, char *user, struct passwd *pw)
{
debug_decl(userpw_matches, SUDO_DEBUG_MATCH)
if (pw != NULL && *sudoers_user == '#') {
uid_t uid = (uid_t) atoi(sudoers_user + 1);
if (uid == pw->pw_uid)
debug_return_bool(true);
}
debug_return_bool(strcmp(sudoers_user, user) == 0);
}
/*
* Returns true if the group/gid from sudoers matches the specified group/gid,
* else returns false.
*/
bool
group_matches(char *sudoers_group, struct group *gr)
{
debug_decl(group_matches, SUDO_DEBUG_MATCH)
if (*sudoers_group == '#') {
gid_t gid = (gid_t) atoi(sudoers_group + 1);
if (gid == gr->gr_gid)
debug_return_bool(true);
}
debug_return_bool(strcmp(gr->gr_name, sudoers_group) == 0);
}
/*
* Returns true if the given user belongs to the named group,
* else returns false.
*/
bool
usergr_matches(char *group, char *user, struct passwd *pw)
{
int matched = false;
struct passwd *pw0 = NULL;
debug_decl(usergr_matches, SUDO_DEBUG_MATCH)
/* make sure we have a valid usergroup, sudo style */
if (*group++ != '%')
goto done;
if (*group == ':' && def_group_plugin) {
matched = group_plugin_query(user, group + 1, pw);
goto done;
}
/* look up user's primary gid in the passwd file */
if (pw == NULL) {
if ((pw0 = sudo_getpwnam(user)) == NULL)
goto done;
pw = pw0;
}
if (user_in_group(pw, group)) {
matched = true;
goto done;
}
/* not a Unix group, could be an external group */
if (def_group_plugin && group_plugin_query(user, group, pw)) {
matched = true;
goto done;
}
done:
if (pw0 != NULL)
pw_delref(pw0);
debug_return_bool(matched);
}
/*
* Returns true if "host" and "user" belong to the netgroup "netgr",
* else return false. Either of "host", "shost" or "user" may be NULL
* in which case that argument is not checked...
*
* XXX - swap order of host & shost
*/
bool
netgr_matches(char *netgr, char *lhost, char *shost, char *user)
{
static char *domain;
#ifdef HAVE_GETDOMAINNAME
static int initialized;
#endif
debug_decl(netgr_matches, SUDO_DEBUG_MATCH)
/* make sure we have a valid netgroup, sudo style */
if (*netgr++ != '+')
debug_return_bool(false);
#ifdef HAVE_GETDOMAINNAME
/* get the domain name (if any) */
if (!initialized) {
domain = (char *) emalloc(MAXHOSTNAMELEN + 1);
if (getdomainname(domain, MAXHOSTNAMELEN + 1) == -1 || *domain == '\0') {
efree(domain);
domain = NULL;
}
initialized = 1;
}
#endif /* HAVE_GETDOMAINNAME */
#ifdef HAVE_INNETGR
if (innetgr(netgr, lhost, user, domain))
debug_return_bool(true);
else if (lhost != shost && innetgr(netgr, shost, user, domain))
debug_return_bool(true);
#endif /* HAVE_INNETGR */
debug_return_bool(false);
}
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