/* vi: set sw=4 ts=4: */
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+/*
+ * Mini sulogin implementation for busybox
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
#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" \
- "(or type Control-D for normal startup):"
-
static const char * const forbid[] = {
"ENV",
"BASH_ENV",
};
-
static void catchalarm(int ATTRIBUTE_UNUSED junk)
{
exit(EXIT_FAILURE);
}
+int sulogin_main(int argc, char **argv);
int sulogin_main(int argc, char **argv)
{
char *cp;
- char *device = (char *) 0;
- const char *name = "root";
int timeout = 0;
-
-#define pass bb_common_bufsiz1
-
- struct passwd pwent;
- struct passwd *pwd;
+ char *timeout_arg;
const char * const *p;
+ struct passwd *pwd;
+ const char *shell;
#if ENABLE_FEATURE_SHADOWPASSWDS
- struct spwd *spwd = NULL;
+ /* Using _r function to avoid pulling in static buffers */
+ char buffer[256];
+ struct spwd spw;
+ struct spwd *result;
#endif
- openlog("sulogin", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
- if (argc > 1) {
- if (strncmp(argv[1], "-t", 2) == 0) {
- if (strcmp(argv[1], "-t") == 0) {
- if (argc > 2) {
- timeout = atoi(argv[2]);
- if (argc > 3) {
- device = argv[3];
- }
- }
- } else {
- 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 {
- syslog(LOG_WARNING, "cannot open %s\n", device);
- exit(EXIT_FAILURE);
- }
- }
+ logmode = LOGMODE_BOTH;
+ openlog(applet_name, 0, LOG_AUTH);
+
+ if (getopt32(argc, argv, "t:", &timeout_arg)) {
+ timeout = xatoi_u(timeout_arg);
}
- if (access(bb_path_passwd_file, 0) == -1) {
- syslog(LOG_WARNING, "No password file\n");
- bb_error_msg_and_die("No password file\n");
+
+ if (argv[optind]) {
+ close(0);
+ close(1);
+ dup(xopen(argv[optind], O_RDWR));
+ close(2);
+ dup(0);
}
+
if (!isatty(0) || !isatty(1) || !isatty(2)) {
- exit(EXIT_FAILURE);
+ logmode = LOGMODE_SYSLOG;
+ bb_error_msg_and_die("not a tty");
}
-
/* Clear out anything dangerous from the environment */
for (p = forbid; *p; p++)
unsetenv(*p);
-
signal(SIGALRM, catchalarm);
- if (!(pwd = getpwnam(name))) {
- syslog(LOG_WARNING, "No password entry for `root'\n");
- bb_error_msg_and_die("No password entry for `root'\n");
+
+ pwd = getpwuid(0);
+ if (!pwd) {
+ goto auth_error;
}
- 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 (getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result)) {
+ goto auth_error;
}
+ pwd->pw_passwd = spw.sp_pwdp;
#endif
+
while (1) {
- cp = bb_askpass(timeout, SULOGIN_PROMPT);
+ /* cp points to a static buffer that is zeroed every time */
+ cp = bb_askpass(timeout,
+ "Give root password for system maintenance\n"
+ "(or type Control-D for normal startup):");
+
if (!cp || !*cp) {
- puts("\n");
- fflush(stdout);
- syslog(LOG_INFO, "Normal startup\n");
- exit(EXIT_SUCCESS);
- } else {
- safe_strncpy(pass, cp, sizeof(pass));
- memset(cp, 0, strlen(cp));
+ bb_info_msg("Normal startup");
+ return 0;
}
- 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);
- puts("Login incorrect");
- fflush(stdout);
- syslog(LOG_WARNING, "Incorrect root password\n");
+ bb_error_msg("login incorrect");
}
- memset(pass, 0, strlen(pass));
+ memset(cp, 0, strlen(cp));
signal(SIGALRM, SIG_DFL);
- puts("Entering System Maintenance Mode\n");
- fflush(stdout);
- syslog(LOG_INFO, "System Maintenance Mode\n");
-#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());
+
+ shell = getenv("SUSHELL");
+ if (!shell) shell = getenv("sushell");
+ if (!shell) {
+ shell = "/bin/sh";
+ if (pwd->pw_shell[0])
+ shell = pwd->pw_shell;
+ }
+ run_shell(shell, 1, 0, 0);
+ /* never returns */
- return (0);
+auth_error:
+ bb_error_msg_and_die("no password entry for 'root'");
}