diff options
| -rw-r--r-- | loginutils/sulogin.c | 132 |
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'"); } |