/*
* Copyright (c) 1996, 1998-2005, 2007-2013
* 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.
*/
#define _SUDO_MAIN
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.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>
#else
# include "compat/fnmatch.h"
#endif /* HAVE_FNMATCH */
#ifdef HAVE_NETGROUP_H
# include <netgroup.h>
#endif /* HAVE_NETGROUP_H */
#include <ctype.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "tsgetgrpw.h"
#include "sudoers.h"
#include "interfaces.h"
#include "parse.h"
#include "sudo_conf.h"
#include "secure_path.h"
#include <gram.h>
/*
* Function Prototypes
*/
int print_alias(void *, void *);
void dump_sudoers(void);
void print_defaults(void);
void print_privilege(struct privilege *);
void print_userspecs(void);
void usage(void) __attribute__((__noreturn__));
static void set_runaspw(const char *);
static void set_runasgr(const char *);
static int cb_runas_default(const char *);
static int testsudoers_print(const char *msg);
extern void setgrfile(const char *);
extern void setgrent(void);
extern void endgrent(void);
extern struct group *getgrent(void);
extern struct group *getgrnam(const char *);
extern struct group *getgrgid(gid_t);
extern void setpwfile(const char *);
extern void setpwent(void);
extern void endpwent(void);
extern struct passwd *getpwent(void);
extern struct passwd *getpwnam(const char *);
extern struct passwd *getpwuid(uid_t);
extern int (*trace_print)(const char *msg);
/*
* Globals
*/
struct sudo_user sudo_user;
struct passwd *list_pw;
static char *runas_group, *runas_user;
#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
extern char *malloc_options;
#endif
#ifdef YYDEBUG
extern int sudoersdebug;
#endif
__dso_public int main(int argc, char *argv[]);
int
main(int argc, char *argv[])
{
struct cmndspec *cs;
struct privilege *priv;
struct userspec *us;
char *p, *grfile, *pwfile;
char hbuf[HOST_NAME_MAX + 1];
const char *errstr;
int match, host_match, runas_match, cmnd_match;
int ch, dflag, exitcode = 0;
debug_decl(main, SUDO_DEBUG_MAIN)
#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
malloc_options = "AFGJPR";
#endif
#ifdef YYDEBUG
sudoersdebug = 1;
#endif
initprogname(argc > 0 ? argv[0] : "testsudoers");
sudoers_initlocale(setlocale(LC_ALL, ""), def_sudoers_locale);
bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have own domain */
textdomain("sudoers");
/* Read sudo.conf. */
sudo_conf_read(NULL);
dflag = 0;
grfile = pwfile = NULL;
while ((ch = getopt(argc, argv, "dg:G:h:P:p:tu:U:")) != -1) {
switch (ch) {
case 'd':
dflag = 1;
break;
case 'h':
user_host = optarg;
break;
case 'G':
sudoers_gid = (gid_t)atoid(optarg, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx("group ID %s: %s", optarg, errstr);
break;
case 'g':
runas_group = optarg;
break;
case 'p':
pwfile = optarg;
break;
case 'P':
grfile = optarg;
break;
case 't':
trace_print = testsudoers_print;
break;
case 'U':
sudoers_uid = (uid_t)atoid(optarg, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx("user ID %s: %s", optarg, errstr);
break;
case 'u':
runas_user = optarg;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
/* Set group/passwd file and init the cache. */
if (grfile)
setgrfile(grfile);
if (pwfile)
setpwfile(pwfile);
sudo_setpwent();
sudo_setgrent();
if (argc < 2) {
if (!dflag)
usage();
user_name = argc ? *argv++ : "root";
user_cmnd = user_base = "true";
argc = 0;
} else {
user_name = *argv++;
user_cmnd = *argv++;
if ((p = strrchr(user_cmnd, '/')) != NULL)
user_base = p + 1;
else
user_base = user_cmnd;
argc -= 2;
}
if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL)
fatalx(U_("unknown user: %s"), user_name);
if (user_host == NULL) {
if (gethostname(hbuf, sizeof(hbuf)) != 0)
fatal("gethostname");
hbuf[sizeof(hbuf) - 1] = '\0';
user_host = hbuf;
}
if ((p = strchr(user_host, '.'))) {
*p = '\0';
user_shost = estrdup(user_host);
*p = '.';
} else {
user_shost = user_host;
}
user_runhost = user_host;
user_srunhost = user_shost;
/* Fill in user_args from argv. */
if (argc > 0) {
char *to, **from;
size_t size, n;
for (size = 0, from = argv; *from; from++)
size += strlen(*from) + 1;
user_args = (char *) emalloc(size);
for (to = user_args, from = argv; *from; from++) {
n = strlcpy(to, *from, size - (to - user_args));
if (n >= size - (to - user_args))
fatalx(U_("internal error, %s overflow"), "init_vars()");
to += n;
*to++ = ' ';
}
*--to = '\0';
}
/* Initialize default values. */
init_defaults();
/* Set runas callback. */
sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
/* Load ip addr/mask for each interface. */
if (get_net_ifs(&p) > 0)
set_interfaces(p);
/* Allocate space for data structures in the parser. */
init_parser("sudoers", false);
if (sudoersparse() != 0 || parse_error) {
parse_error = true;
if (errorlineno != -1)
(void) printf("Parse error in %s near line %d",
errorfile, errorlineno);
else
(void) printf("Parse error in %s", errorfile);
} else {
(void) fputs("Parses OK", stdout);
}
if (!update_defaults(SETDEF_ALL))
(void) fputs(" (problem with defaults entries)", stdout);
puts(".");
if (def_group_plugin && group_plugin_load(def_group_plugin) != true)
def_group_plugin = NULL;
/*
* Set runas passwd/group entries based on command line or sudoers.
* Note that if runas_group was specified without runas_user we
* defer setting runas_pw so the match routines know to ignore it.
*/
if (runas_group != NULL) {
set_runasgr(runas_group);
if (runas_user != NULL)
set_runaspw(runas_user);
} else
set_runaspw(runas_user ? runas_user : def_runas_default);
if (dflag) {
(void) putchar('\n');
dump_sudoers();
if (argc < 2) {
exitcode = parse_error ? 1 : 0;
goto done;
}
}
/* This loop must match the one in sudo_file_lookup() */
printf("\nEntries for user %s:\n", user_name);
match = UNSPEC;
TAILQ_FOREACH_REVERSE(us, &userspecs, userspec_list, entries) {
if (userlist_matches(sudo_user.pw, &us->users) != ALLOW)
continue;
TAILQ_FOREACH_REVERSE(priv, &us->privileges, privilege_list, entries) {
putchar('\n');
print_privilege(priv);
putchar('\n');
host_match = hostlist_matches(&priv->hostlist);
if (host_match == ALLOW) {
puts("\thost matched");
TAILQ_FOREACH_REVERSE(cs, &priv->cmndlist, cmndspec_list, entries) {
runas_match = runaslist_matches(cs->runasuserlist,
cs->runasgrouplist, NULL, NULL);
if (runas_match == ALLOW) {
puts("\trunas matched");
cmnd_match = cmnd_matches(cs->cmnd);
if (cmnd_match != UNSPEC)
match = cmnd_match;
printf("\tcmnd %s\n", match == ALLOW ? "allowed" :
match == DENY ? "denied" : "unmatched");
}
}
} else
puts(_("\thost unmatched"));
}
}
puts(match == ALLOW ? _("\nCommand allowed") :
match == DENY ? _("\nCommand denied") : _("\nCommand unmatched"));
/*
* Exit codes:
* 0 - parsed OK and command matched.
* 1 - parse error
* 2 - command not matched
* 3 - command denied
*/
exitcode = parse_error ? 1 : (match == ALLOW ? 0 : match + 3);
done:
sudo_endpwent();
sudo_endgrent();
sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
exit(exitcode);
}
static void
set_runaspw(const char *user)
{
struct passwd *pw = NULL;
debug_decl(set_runaspw, SUDO_DEBUG_UTIL)
if (*user == '#') {
const char *errstr;
uid_t uid = atoid(user + 1, NULL, NULL, &errstr);
if (errstr == NULL) {
if ((pw = sudo_getpwuid(uid)) == NULL)
pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
}
}
if (pw == NULL) {
if ((pw = sudo_getpwnam(user)) == NULL)
fatalx(U_("unknown user: %s"), user);
}
if (runas_pw != NULL)
sudo_pw_delref(runas_pw);
runas_pw = pw;
debug_return;
}
static void
set_runasgr(const char *group)
{
struct group *gr = NULL;
debug_decl(set_runasgr, SUDO_DEBUG_UTIL)
if (*group == '#') {
const char *errstr;
gid_t gid = atoid(group + 1, NULL, NULL, &errstr);
if (errstr == NULL) {
if ((gr = sudo_getgrgid(gid)) == NULL)
gr = sudo_fakegrnam(group);
}
}
if (gr == NULL) {
if ((gr = sudo_getgrnam(group)) == NULL)
fatalx(U_("unknown group: %s"), group);
}
if (runas_gr != NULL)
sudo_gr_delref(runas_gr);
runas_gr = gr;
debug_return;
}
/*
* Callback for runas_default sudoers setting.
*/
static int
cb_runas_default(const char *user)
{
/* Only reset runaspw if user didn't specify one. */
if (!runas_user && !runas_group)
set_runaspw(user);
return true;
}
void
sudo_setspent(void)
{
return;
}
void
sudo_endspent(void)
{
return;
}
FILE *
open_sudoers(const char *sudoers, bool doedit, bool *keepopen)
{
struct stat sb;
FILE *fp = NULL;
char *sudoers_base;
debug_decl(open_sudoers, SUDO_DEBUG_UTIL)
sudoers_base = strrchr(sudoers, '/');
if (sudoers_base != NULL)
sudoers_base++;
switch (sudo_secure_file(sudoers, sudoers_uid, sudoers_gid, &sb)) {
case SUDO_PATH_SECURE:
fp = fopen(sudoers, "r");
break;
case SUDO_PATH_MISSING:
warning("unable to stat %s", sudoers_base);
break;
case SUDO_PATH_BAD_TYPE:
warningx("%s is not a regular file", sudoers_base);
break;
case SUDO_PATH_WRONG_OWNER:
warningx("%s should be owned by uid %u",
sudoers_base, (unsigned int) sudoers_uid);
break;
case SUDO_PATH_WORLD_WRITABLE:
warningx("%s is world writable", sudoers_base);
break;
case SUDO_PATH_GROUP_WRITABLE:
warningx("%s should be owned by gid %u",
sudoers_base, (unsigned int) sudoers_gid);
break;
default:
/* NOTREACHED */
break;
}
debug_return_ptr(fp);
}
void
init_envtables(void)
{
return;
}
int
set_perms(int perm)
{
return 1;
}
void
restore_perms(void)
{
}
void
print_member(struct member *m)
{
struct sudo_command *c;
debug_decl(print_member, SUDO_DEBUG_UTIL)
if (m->negated)
putchar('!');
if (m->name == NULL)
fputs("ALL", stdout);
else if (m->type != COMMAND)
fputs(m->name, stdout);
else {
c = (struct sudo_command *) m->name;
printf("%s%s%s", c->cmnd, c->args ? " " : "",
c->args ? c->args : "");
}
debug_return;
}
void
print_defaults(void)
{
struct defaults *d;
struct member *m;
debug_decl(print_defaults, SUDO_DEBUG_UTIL)
TAILQ_FOREACH(d, &defaults, entries) {
(void) fputs("Defaults", stdout);
switch (d->type) {
case DEFAULTS_HOST:
putchar('@');
break;
case DEFAULTS_USER:
putchar(':');
break;
case DEFAULTS_RUNAS:
putchar('>');
break;
case DEFAULTS_CMND:
putchar('!');
break;
}
TAILQ_FOREACH(m, d->binding, entries) {
if (m != TAILQ_FIRST(d->binding))
putchar(',');
print_member(m);
}
printf("\t%s%s", d->op == false ? "!" : "", d->var);
if (d->val != NULL) {
printf("%c%s", d->op == true ? '=' : d->op, d->val);
}
putchar('\n');
}
debug_return;
}
int
print_alias(void *v1, void *v2)
{
struct alias *a = (struct alias *)v1;
struct member *m;
struct sudo_command *c;
debug_decl(print_alias, SUDO_DEBUG_UTIL)
switch (a->type) {
case HOSTALIAS:
(void) printf("Host_Alias\t%s = ", a->name);
break;
case CMNDALIAS:
(void) printf("Cmnd_Alias\t%s = ", a->name);
break;
case USERALIAS:
(void) printf("User_Alias\t%s = ", a->name);
break;
case RUNASALIAS:
(void) printf("Runas_Alias\t%s = ", a->name);
break;
}
TAILQ_FOREACH(m, &a->members, entries) {
if (m != TAILQ_FIRST(&a->members))
fputs(", ", stdout);
if (m->type == COMMAND) {
c = (struct sudo_command *) m->name;
printf("%s%s%s", c->cmnd, c->args ? " " : "",
c->args ? c->args : "");
} else if (m->type == ALL) {
fputs("ALL", stdout);
} else {
fputs(m->name, stdout);
}
}
putchar('\n');
debug_return_int(0);
}
void
print_privilege(struct privilege *priv)
{
struct cmndspec *cs;
struct member *m;
struct cmndtag tags;
debug_decl(print_privilege, SUDO_DEBUG_UTIL)
TAILQ_FOREACH(m, &priv->hostlist, entries) {
if (m != TAILQ_FIRST(&priv->hostlist))
fputs(", ", stdout);
print_member(m);
}
fputs(" = ", stdout);
tags.nopasswd = UNSPEC;
tags.noexec = UNSPEC;
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
if (cs != TAILQ_FIRST(&priv->cmndlist))
fputs(", ", stdout);
if (cs->runasuserlist != NULL || cs->runasgrouplist != NULL) {
fputs("(", stdout);
if (cs->runasuserlist != NULL) {
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
if (m != TAILQ_FIRST(cs->runasuserlist))
fputs(", ", stdout);
print_member(m);
}
} else if (cs->runasgrouplist == NULL) {
fputs(def_runas_default, stdout);
} else {
fputs(sudo_user.pw->pw_name, stdout);
}
if (cs->runasgrouplist != NULL) {
fputs(" : ", stdout);
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
if (m != TAILQ_FIRST(cs->runasgrouplist))
fputs(", ", stdout);
print_member(m);
}
}
fputs(") ", stdout);
}
#ifdef HAVE_SELINUX
if (cs->role)
printf("ROLE=%s ", cs->role);
if (cs->type)
printf("TYPE=%s ", cs->type);
#endif /* HAVE_SELINUX */
#ifdef HAVE_PRIV_SET
if (cs->privs)
printf("PRIVS=%s ", cs->privs);
if (cs->limitprivs)
printf("LIMITPRIVS=%s ", cs->limitprivs);
#endif /* HAVE_PRIV_SET */
if (cs->tags.nopasswd != UNSPEC && cs->tags.nopasswd != tags.nopasswd)
printf("%sPASSWD: ", cs->tags.nopasswd ? "NO" : "");
if (cs->tags.noexec != UNSPEC && cs->tags.noexec != tags.noexec)
printf("%sEXEC: ", cs->tags.noexec ? "NO" : "");
print_member(cs->cmnd);
memcpy(&tags, &cs->tags, sizeof(tags));
}
debug_return;
}
void
print_userspecs(void)
{
struct member *m;
struct userspec *us;
struct privilege *priv;
debug_decl(print_userspecs, SUDO_DEBUG_UTIL)
TAILQ_FOREACH(us, &userspecs, entries) {
TAILQ_FOREACH(m, &us->users, entries) {
if (m != TAILQ_FIRST(&us->users))
fputs(", ", stdout);
print_member(m);
}
putchar('\t');
TAILQ_FOREACH(priv, &us->privileges, entries) {
if (priv != TAILQ_FIRST(&us->privileges))
fputs(" : ", stdout);
print_privilege(priv);
}
putchar('\n');
}
debug_return;
}
void
dump_sudoers(void)
{
debug_decl(dump_sudoers, SUDO_DEBUG_UTIL)
print_defaults();
putchar('\n');
alias_apply(print_alias, NULL);
putchar('\n');
print_userspecs();
debug_return;
}
static int testsudoers_print(const char *msg)
{
return fputs(msg, stderr);
}
void
usage(void)
{
(void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-P grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname());
exit(1);
}
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