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-rw-r--r--loginutils/sulogin.c132
1 files changed, 45 insertions, 87 deletions
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index 763a991..15f3fb2 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -1,26 +1,16 @@
/* vi: set sw=4 ts=4: */
/*
+ * Mini sulogin implementation for busybox
+ *
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
#include <syslog.h>
-#include <unistd.h>
-#include <utmp.h>
-#include <sys/resource.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <ctype.h>
-#include <time.h>
#include "busybox.h"
-#define SULOGIN_PROMPT "\nGive root password for system maintenance\n" \
+#define SULOGIN_PROMPT "Give root password for system maintenance\n" \
"(or type Control-D for normal startup):"
static const char * const forbid[] = {
@@ -52,57 +42,33 @@ static void catchalarm(int ATTRIBUTE_UNUSED junk)
int sulogin_main(int argc, char **argv)
{
char *cp;
- char *device = NULL;
- const char *name = "root";
int timeout = 0;
+ char *timeout_arg;
+ const char * const *p;
+ struct passwd *pwd;
+ struct spwd *spwd;
-#define pass bb_common_bufsiz1
+ if (ENABLE_FEATURE_SYSLOG) {
+ logmode = LOGMODE_BOTH;
+ openlog(bb_applet_name, LOG_CONS | LOG_NOWAIT, LOG_AUTH);
+ }
- struct passwd pwent;
- struct passwd *pwd;
- const char * const *p;
-#if ENABLE_FEATURE_SHADOWPASSWDS
- struct spwd *spwd = NULL;
-#endif
-
- openlog("sulogin", LOG_PID | LOG_NOWAIT, LOG_AUTH);
- logmode = LOGMODE_BOTH;
- if (argc > 1) {
- if (strncmp(argv[1], "-t", 2) == 0) {
- if (argv[1][2] == '\0') { /* -t NN */
- if (argc > 2) {
- timeout = atoi(argv[2]);
- if (argc > 3) {
- device = argv[3];
- }
- }
- } else { /* -tNNN */
- timeout = atoi(&argv[1][2]);
- if (argc > 2) {
- device = argv[2];
- }
- }
- } else {
- device = argv[1];
- }
- if (device) {
- close(0);
- close(1);
- close(2);
- if (open(device, O_RDWR) == 0) {
- dup(0);
- dup(0);
- } else {
- /* Well, it will go only to syslog :) */
- bb_perror_msg_and_die("Cannot open %s", device);
- }
+ if (bb_getopt_ulflags (argc, argv, "t:", &timeout_arg)) {
+ if (safe_strtoi(timeout_arg, &timeout)) {
+ timeout = 0;
}
}
- if (!isatty(0) || !isatty(1) || !isatty(2)) {
- exit(EXIT_FAILURE);
+
+ if (argv[optind]) {
+ close(0);
+ close(1);
+ close(2);
+ dup(xopen(argv[optind], O_RDWR));
+ dup(0);
}
- if (access(bb_path_passwd_file, 0) == -1) {
- bb_error_msg_and_die("No password file");
+
+ if (!isatty(0) || !isatty(1) || !isatty(2)) {
+ bb_error_msg_and_die("Not a tty");
}
/* Clear out anything dangerous from the environment */
@@ -110,48 +76,40 @@ int sulogin_main(int argc, char **argv)
unsetenv(*p);
signal(SIGALRM, catchalarm);
- if (!(pwd = getpwnam(name))) {
- bb_error_msg_and_die("No password entry for `root'");
- }
- pwent = *pwd;
-#if ENABLE_FEATURE_SHADOWPASSWDS
- spwd = NULL;
- if (pwd && ((strcmp(pwd->pw_passwd, "x") == 0)
- || (strcmp(pwd->pw_passwd, "*") == 0))) {
- endspent();
- spwd = getspnam(name);
- if (spwd) {
- pwent.pw_passwd = spwd->sp_pwdp;
+
+ if (!(pwd = getpwuid(0))) {
+ goto AUTH_ERROR;
+ }
+
+ if (ENABLE_FEATURE_SHADOWPASSWDS) {
+ if (!(spwd = getspnam(pwd->pw_name))) {
+ goto AUTH_ERROR;
}
+ pwd->pw_passwd = spwd->sp_pwdp;
}
-#endif
+
while (1) {
+ /* cp points to a static buffer that is zeroed every time */
cp = bb_askpass(timeout, SULOGIN_PROMPT);
if (!cp || !*cp) {
- puts("\n"); /* Why only on error path? */
- fflush(stdout);
- /* Why only to syslog? */
- syslog(LOG_INFO, "Normal startup");
+ bb_info_msg("Normal startup");
exit(EXIT_SUCCESS);
- } else {
- safe_strncpy(pass, cp, sizeof(pass));
- memset(cp, 0, strlen(cp));
}
- if (strcmp(pw_encrypt(pass, pwent.pw_passwd), pwent.pw_passwd) == 0) {
+ if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
break;
}
bb_do_delay(FAIL_DELAY);
- bb_error_msg("Incorrect root password");
+ bb_error_msg("Login incorrect");
}
- memset(pass, 0, strlen(pass));
+ memset(cp, 0, strlen(cp));
signal(SIGALRM, SIG_DFL);
- bb_info_msg("Entering System Maintenance Mode");
-#if ENABLE_SELINUX
- renew_current_security_context();
-#endif
+ bb_info_msg("System Maintenance Mode");
- run_shell(pwent.pw_shell, 1, 0, 0);
+ USE_SELINUX(renew_current_security_context());
- return 0;
+ run_shell(pwd->pw_shell, 1, 0, 0);
+ /* never returns */
+AUTH_ERROR:
+ bb_error_msg_and_die("No password entry for `root'");
}