160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <time.h>
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#include "busybox.h"
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#define SULOGIN_PROMPT "\nGive root password for system maintenance\n" \
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"(or type Control-D for normal startup):"
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static const char * const forbid[] = {
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"ENV",
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"BASH_ENV",
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"HOME",
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"IFS",
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"PATH",
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"SHELL",
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"LD_LIBRARY_PATH",
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"LD_PRELOAD",
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"LD_TRACE_LOADED_OBJECTS",
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"LD_BIND_NOW",
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"LD_AOUT_LIBRARY_PATH",
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"LD_AOUT_PRELOAD",
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"LD_NOWARN",
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"LD_KEEPDIR",
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(char *) 0
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};
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static void catchalarm(int ATTRIBUTE_UNUSED junk)
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{
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exit(EXIT_FAILURE);
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}
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int sulogin_main(int argc, char **argv)
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{
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char *cp;
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char *device = (char *) 0;
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const char *name = "root";
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int timeout = 0;
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#define pass bb_common_bufsiz1
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struct passwd pwent;
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struct passwd *pwd;
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const char * const *p;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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struct spwd *spwd = NULL;
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#endif
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openlog("sulogin", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
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if (argc > 1) {
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if (strncmp(argv[1], "-t", 2) == 0) {
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if (strcmp(argv[1], "-t") == 0) {
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if (argc > 2) {
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timeout = atoi(argv[2]);
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if (argc > 3) {
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device = argv[3];
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}
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}
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} else {
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if (argc > 2) {
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device = argv[2];
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}
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}
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} else {
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device = argv[1];
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}
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if (device) {
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close(0);
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close(1);
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close(2);
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if (open(device, O_RDWR) >= 0) {
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dup(0);
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dup(0);
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} else {
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syslog(LOG_WARNING, "cannot open %s\n", device);
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exit(EXIT_FAILURE);
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}
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}
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}
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if (access(bb_path_passwd_file, 0) == -1) {
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syslog(LOG_WARNING, "No password file\n");
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bb_error_msg_and_die("No password file\n");
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}
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if (!isatty(0) || !isatty(1) || !isatty(2)) {
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exit(EXIT_FAILURE);
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}
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/* Clear out anything dangerous from the environment */
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for (p = forbid; *p; p++)
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unsetenv(*p);
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signal(SIGALRM, catchalarm);
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if (!(pwd = getpwnam(name))) {
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syslog(LOG_WARNING, "No password entry for `root'\n");
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bb_error_msg_and_die("No password entry for `root'\n");
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}
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pwent = *pwd;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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spwd = NULL;
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if (pwd && ((strcmp(pwd->pw_passwd, "x") == 0)
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|| (strcmp(pwd->pw_passwd, "*") == 0))) {
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endspent();
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spwd = getspnam(name);
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if (spwd) {
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pwent.pw_passwd = spwd->sp_pwdp;
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}
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}
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#endif
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while (1) {
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cp = bb_askpass(timeout, SULOGIN_PROMPT);
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if (!cp || !*cp) {
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puts("\n");
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fflush(stdout);
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syslog(LOG_INFO, "Normal startup\n");
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exit(EXIT_SUCCESS);
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} else {
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safe_strncpy(pass, cp, sizeof(pass));
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memset(cp, 0, strlen(cp));
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}
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if (strcmp(pw_encrypt(pass, pwent.pw_passwd), pwent.pw_passwd) == 0) {
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break;
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}
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bb_do_delay(FAIL_DELAY);
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puts("Login incorrect");
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fflush(stdout);
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syslog(LOG_WARNING, "Incorrect root password\n");
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}
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memset(pass, 0, strlen(pass));
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signal(SIGALRM, SIG_DFL);
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puts("Entering System Maintenance Mode\n");
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fflush(stdout);
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syslog(LOG_INFO, "System Maintenance Mode\n");
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#if ENABLE_SELINUX
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renew_current_security_context();
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#endif
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run_shell(pwent.pw_shell, 1, 0, 0);
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return (0);
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}
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