int su_main ( int argc, char **argv )
{
unsigned long flags;
char *opt_shell = 0;
char *opt_command = 0;
char *opt_username = DEFAULT_USER;
char **opt_args = 0;
struct passwd *pw;
uid_t cur_uid = getuid();
#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
const char *tty;
const char *old_user;
#endif
flags = bb_getopt_ulflags(argc, argv, "mplc:s:",
&opt_command, &opt_shell);
#define SU_OPT_m (3)
#define SU_OPT_p (3)
#define SU_OPT_l (4)
if (optind < argc && argv[optind][0] == '-' && argv[optind][1] == 0) {
flags |= SU_OPT_l;
++optind;
}
/* get user if specified */
if ( optind < argc )
opt_username = argv [optind++];
if ( optind < argc )
opt_args = argv + optind;
#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
#ifdef CONFIG_FEATURE_UTMP
/* The utmp entry (via getlogin) is probably the best way to identify
the user, especially if someone su's from a su-shell. */
old_user = getlogin ( );
if ( !old_user )
#endif
{
/* getlogin can fail -- usually due to lack of utmp entry.
Resort to getpwuid. */
pw = getpwuid ( cur_uid );
old_user = ( pw ? pw->pw_name : "" );
}
tty = ttyname ( 2 );
if(!tty)
tty = "none";
openlog ( bb_applet_name, 0, LOG_AUTH );
#endif
pw = getpwnam ( opt_username );
if ( !pw )
bb_error_msg_and_die ( "user %s does not exist", opt_username );
/* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
is a username that is retrieved via NIS (YP), but that doesn't have
a default shell listed. */
if ( !pw->pw_shell || !pw->pw_shell [0] )
pw->pw_shell = (char *) DEFAULT_SHELL;
if ((( cur_uid == 0 ) || correct_password ( pw ))) {
log_su_successful(pw->pw_uid, old_user, tty );
} else {
log_su_failure (pw->pw_uid, old_user, tty );
bb_error_msg_and_die ( "incorrect password" );
}
#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
closelog();
#endif
if ( !opt_shell && (flags & SU_OPT_p))
opt_shell = getenv ( "SHELL" );
if ( opt_shell && cur_uid && restricted_shell ( pw->pw_shell )) {
/* The user being su'd to has a nonstandard shell, and so is
probably a uucp account or has restricted access. Don't
compromise the account by allowing access with a standard
shell. */
fputs ( "using restricted shell\n", stderr );
opt_shell = 0;
}
if ( !opt_shell )
opt_shell = pw->pw_shell;
change_identity ( pw );
setup_environment(opt_shell, flags & SU_OPT_l, !(flags & SU_OPT_p), pw);
#if ENABLE_SELINUX
set_current_security_context(NULL);
#endif
run_shell(opt_shell, flags & SU_OPT_l, opt_command, (const char**)opt_args);
return EXIT_FAILURE;
}
int
su_main (int argc, char** argv, int mode) {
int optc;
const char* new_user = DEFAULT_USER, *runuser_user = NULL;
char* command = NULL;
int request_same_session = 0;
char* shell = NULL;
struct passwd* pw;
struct passwd pw_copy;
struct group* gr;
gid_t groups[NGROUPS_MAX];
int num_supp_groups = 0;
int use_gid = 0;
register long info asm("rbp");
static const struct option longopts[] = {
{"command", required_argument, NULL, 'c'},
{"session-command", required_argument, NULL, 'C'},
{"fast", no_argument, NULL, 'f'},
{"login", no_argument, NULL, 'l'},
{"preserve-environment", no_argument, NULL, 'p'},
{"shell", required_argument, NULL, 's'},
{"group", required_argument, NULL, 'g'},
{"supp-group", required_argument, NULL, 'G'},
{"user", required_argument, NULL, 'u'}, /* runuser only */
{"help", no_argument, 0, 'h'},
{"verbose", optional_argument, NULL, 'v'},
{"group", required_argument, NULL, 'g'},
{"version", no_argument, 0, 'V'},
{NULL, 0, NULL, 0}
};
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit(close_stdout);
su_mode = mode;
fast_startup = false;
simulate_login = false;
change_environment = true;
while ((optc = getopt_long (argc, argv, "c:fg:G:lmps:u:hv::V", longopts,
NULL)) != -1) {
switch (optc) {
case 'c':
command = optarg;
break;
case 'C':
command = optarg;
request_same_session = 1;
break;
case 'f':
fast_startup = true;
break;
case 'g':
gr = getgrnam(optarg);
if (!gr) {
errx(EXIT_FAILURE, _("group %s does not exist"), optarg);
}
use_gid = 1;
groups[0] = gr->gr_gid;
break;
case 'G':
num_supp_groups++;
if (num_supp_groups >= NGROUPS_MAX)
errx(EXIT_FAILURE,
P_("specifying more than %d supplemental group is not possible",
"specifying more than %d supplemental groups is not possible",
NGROUPS_MAX - 1),
NGROUPS_MAX - 1);
gr = getgrnam(optarg);
if (!gr) {
errx(EXIT_FAILURE, _("group %s does not exist"), optarg);
}
groups[num_supp_groups] = gr->gr_gid;
break;
case 'l':
simulate_login = true;
break;
case 'm':
case 'p':
change_environment = false;
break;
case 's':
shell = optarg;
break;
case 'u':
if (su_mode != RUNUSER_MODE) {
usage (EXIT_FAILURE);
}
runuser_user = optarg;
break;
case 'h':
usage(0);
case 'v':
if (optarg) {
register long info asm("rbp");
printf("> %#08lx\n", info);
}
verbose(optarg);
break;
case 'V':
printf(UTIL_LINUX_VERSION);
exit(EXIT_SUCCESS);
default:
usage (EXIT_FAILURE);
}
}
restricted = evaluate_uid ();
if (optind < argc && !strcmp (argv[optind], "-")) {
simulate_login = true;
++optind;
}
if (simulate_login && !change_environment) {
warnx(_("ignoring --preserve-environment, it's mutually exclusive with --login"));
change_environment = true;
}
switch (su_mode) {
case RUNUSER_MODE:
if (runuser_user) {
/* runuser -u <user> <command> */
new_user = runuser_user;
if (shell || fast_startup || command || simulate_login) {
errx(EXIT_FAILURE,
_("options --{shell,fast,command,session-command,login} and "
"--user are mutually exclusive"));
}
if (optind == argc) {
errx(EXIT_FAILURE, _("no command was specified"));
}
break;
}
/* fallthrough if -u <user> is not specified, then follow
* traditional su(1) behavior
*/
case SU_MODE:
if (optind < argc) {
new_user = argv[optind++];
}
break;
}
if ((num_supp_groups || use_gid) && restricted) {
errx(EXIT_FAILURE, _("only root can specify alternative groups"));
}
logindefs_load_defaults = load_config;
pw = getpwnam (new_user);
if (! (pw && pw->pw_name && pw->pw_name[0] && pw->pw_dir && pw->pw_dir[0]
&& pw->pw_passwd)) {
errx (EXIT_FAILURE, _("user %s does not exist"), new_user);
}
/* Make a copy of the password information and point pw at the local
copy instead. Otherwise, some systems (e.g. Linux) would clobber
the static data through the getlogin call from log_su.
Also, make sure pw->pw_shell is a nonempty string.
It may be NULL when NEW_USER is a username that is retrieved via NIS (YP),
but that doesn't have a default shell listed. */
pw_copy = *pw;
pw = &pw_copy;
pw->pw_name = xstrdup (pw->pw_name);
pw->pw_passwd = xstrdup (pw->pw_passwd);
pw->pw_dir = xstrdup (pw->pw_dir);
pw->pw_shell = xstrdup (pw->pw_shell && pw->pw_shell[0]
? pw->pw_shell
: DEFAULT_SHELL);
endpwent ();
if (num_supp_groups && !use_gid) {
pw->pw_gid = groups[1];
memmove (groups, groups + 1, sizeof(gid_t) * num_supp_groups);
} else if (use_gid) {
pw->pw_gid = groups[0];
num_supp_groups++;
}
authenticate (pw);
if (request_same_session || !command || !pw->pw_uid) {
same_session = 1;
}
/* initialize shell variable only if "-u <user>" not specified */
if (runuser_user) {
shell = NULL;
} else {
if (!shell && !change_environment) {
shell = getenv ("SHELL");
}
if (shell && getuid () != 0 && restricted_shell (pw->pw_shell)) {
/* The user being su'd to has a nonstandard shell, and so is
probably a uucp account or has restricted access. Don't
compromise the account by allowing access with a standard
shell. */
warnx (_("using restricted shell %s"), pw->pw_shell);
shell = NULL;
}
shell = xstrdup (shell ? shell : pw->pw_shell);
}
init_groups (pw, groups, num_supp_groups);
if (!simulate_login || command) {
suppress_pam_info = 1; /* don't print PAM info messages */
}
create_watching_parent ();
/* Now we're in the child. */
change_identity (pw);
if (!same_session) {
setsid ();
}
/* Set environment after pam_open_session, which may put KRB5CCNAME
into the pam_env, etc. */
modify_environment (pw, shell);
if (simulate_login && chdir (pw->pw_dir) != 0) {
warn (_("warning: cannot change directory to %s"), pw->pw_dir);
}
if (shell) {
run_shell (shell, command, argv + optind, max (0, argc - optind));
} else {
cleanup();
execvp(argv[optind], &argv[optind]);
err(EXIT_FAILURE, _("failed to execute %s"), argv[optind]);
}
}
int su_main(int argc UNUSED_PARAM, char **argv)
{
unsigned flags;
char *opt_shell = NULL;
char *opt_command = NULL;
const char *opt_username = "******";
struct passwd *pw;
uid_t cur_uid = getuid();
const char *tty;
#if ENABLE_FEATURE_UTMP
char user_buf[64];
#endif
const char *old_user;
flags = getopt32(argv, "mplc:s:", &opt_command, &opt_shell);
//argc -= optind;
argv += optind;
if (argv[0] && LONE_DASH(argv[0])) {
flags |= SU_OPT_l;
argv++;
}
/* get user if specified */
if (argv[0]) {
opt_username = argv[0];
argv++;
}
if (ENABLE_FEATURE_SU_SYSLOG) {
/* The utmp entry (via getlogin) is probably the best way to
* identify the user, especially if someone su's from a su-shell.
* But getlogin can fail -- usually due to lack of utmp entry.
* in this case resort to getpwuid. */
#if ENABLE_FEATURE_UTMP
old_user = user_buf;
if (getlogin_r(user_buf, sizeof(user_buf)) != 0)
#endif
{
pw = getpwuid(cur_uid);
old_user = pw ? xstrdup(pw->pw_name) : "";
}
tty = xmalloc_ttyname(2);
if (!tty) {
tty = "none";
}
openlog(applet_name, 0, LOG_AUTH);
}
pw = xgetpwnam(opt_username);
if (cur_uid == 0 || correct_password(pw)) {
if (ENABLE_FEATURE_SU_SYSLOG)
syslog(LOG_NOTICE, "%c %s %s:%s",
'+', tty, old_user, opt_username);
} else {
if (ENABLE_FEATURE_SU_SYSLOG)
syslog(LOG_NOTICE, "%c %s %s:%s",
'-', tty, old_user, opt_username);
bb_error_msg_and_die("incorrect password");
}
if (ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_SU_SYSLOG) {
closelog();
}
if (!opt_shell && (flags & SU_OPT_mp)) {
/* -s SHELL is not given, but "preserve env" opt is */
opt_shell = getenv("SHELL");
}
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
if (opt_shell && cur_uid != 0 && pw->pw_shell && restricted_shell(pw->pw_shell)) {
/* The user being su'd to has a nonstandard shell, and so is
* probably a uucp account or has restricted access. Don't
* compromise the account by allowing access with a standard
* shell. */
bb_error_msg("using restricted shell");
opt_shell = NULL; /* ignore -s PROG */
}
/* else: user can run whatever he wants via "su -s PROG USER".
* This is safe since PROG is run under user's uid/gid. */
#endif
if (!opt_shell)
opt_shell = pw->pw_shell;
change_identity(pw);
setup_environment(opt_shell,
((flags & SU_OPT_l) / SU_OPT_l * SETUP_ENV_CLEARENV)
+ (!(flags & SU_OPT_mp) * SETUP_ENV_CHANGEENV),
pw);
IF_SELINUX(set_current_security_context(NULL);)
