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/* vi: set sw=4 ts=4: */
/*
* 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" \
"(or type Control-D for normal startup):"
static const char * const forbid[] = {
"ENV",
"BASH_ENV",
"HOME",
"IFS",
"PATH",
"SHELL",
"LD_LIBRARY_PATH",
"LD_PRELOAD",
"LD_TRACE_LOADED_OBJECTS",
"LD_BIND_NOW",
"LD_AOUT_LIBRARY_PATH",
"LD_AOUT_PRELOAD",
"LD_NOWARN",
"LD_KEEPDIR",
(char *) 0
};
static void catchalarm(int ATTRIBUTE_UNUSED junk)
{
exit(EXIT_FAILURE);
}
int sulogin_main(int argc, char **argv)
{
char *cp;
char *device = NULL;
const char *name = "root";
int timeout = 0;
#define pass bb_common_bufsiz1
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 (!isatty(0) || !isatty(1) || !isatty(2)) {
exit(EXIT_FAILURE);
}
if (access(bb_path_passwd_file, 0) == -1) {
bb_error_msg_and_die("No password file");
}
/* Clear out anything dangerous from the environment */
for (p = forbid; *p; p++)
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;
}
}
#endif
while (1) {
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");
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) {
break;
}
bb_do_delay(FAIL_DELAY);
bb_error_msg("Incorrect root password");
}
memset(pass, 0, strlen(pass));
signal(SIGALRM, SIG_DFL);
bb_info_msg("Entering System Maintenance Mode");
#if ENABLE_SELINUX
renew_current_security_context();
#endif
run_shell(pwent.pw_shell, 1, 0, 0);
return 0;
}
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