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    Contents of /trunk/mkinitrd-magellan/busybox/loginutils/sulogin.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 2273 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini sulogin implementation for busybox
    4 *
    5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    6 */
    7
    8 #include <syslog.h>
    9
    10 #include "busybox.h"
    11
    12 static const char * const forbid[] = {
    13 "ENV",
    14 "BASH_ENV",
    15 "HOME",
    16 "IFS",
    17 "PATH",
    18 "SHELL",
    19 "LD_LIBRARY_PATH",
    20 "LD_PRELOAD",
    21 "LD_TRACE_LOADED_OBJECTS",
    22 "LD_BIND_NOW",
    23 "LD_AOUT_LIBRARY_PATH",
    24 "LD_AOUT_PRELOAD",
    25 "LD_NOWARN",
    26 "LD_KEEPDIR",
    27 (char *) 0
    28 };
    29
    30
    31 static void catchalarm(int ATTRIBUTE_UNUSED junk)
    32 {
    33 exit(EXIT_FAILURE);
    34 }
    35
    36
    37 int sulogin_main(int argc, char **argv)
    38 {
    39 char *cp;
    40 int timeout = 0;
    41 char *timeout_arg;
    42 const char * const *p;
    43 struct passwd *pwd;
    44 const char *shell;
    45
    46 logmode = LOGMODE_BOTH;
    47 openlog(applet_name, 0, LOG_AUTH);
    48
    49 if (getopt32(argc, argv, "t:", &timeout_arg)) {
    50 timeout = xatoi_u(timeout_arg);
    51 }
    52
    53 if (argv[optind]) {
    54 close(0);
    55 close(1);
    56 dup(xopen(argv[optind], O_RDWR));
    57 close(2);
    58 dup(0);
    59 }
    60
    61 if (!isatty(0) || !isatty(1) || !isatty(2)) {
    62 logmode = LOGMODE_SYSLOG;
    63 bb_error_msg_and_die("not a tty");
    64 }
    65
    66 /* Clear out anything dangerous from the environment */
    67 for (p = forbid; *p; p++)
    68 unsetenv(*p);
    69
    70 signal(SIGALRM, catchalarm);
    71
    72 pwd = getpwuid(0);
    73 if (!pwd) {
    74 goto auth_error;
    75 }
    76
    77 #if ENABLE_FEATURE_SHADOWPASSWDS
    78 {
    79 struct spwd *spwd = getspnam(pwd->pw_name);
    80 if (!spwd) {
    81 goto auth_error;
    82 }
    83 pwd->pw_passwd = spwd->sp_pwdp;
    84 }
    85 #endif
    86
    87 while (1) {
    88 /* cp points to a static buffer that is zeroed every time */
    89 cp = bb_askpass(timeout,
    90 "Give root password for system maintenance\n"
    91 "(or type Control-D for normal startup):");
    92
    93 if (!cp || !*cp) {
    94 bb_info_msg("Normal startup");
    95 return 0;
    96 }
    97 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
    98 break;
    99 }
    100 bb_do_delay(FAIL_DELAY);
    101 bb_error_msg("login incorrect");
    102 }
    103 memset(cp, 0, strlen(cp));
    104 signal(SIGALRM, SIG_DFL);
    105
    106 bb_info_msg("System Maintenance Mode");
    107
    108 USE_SELINUX(renew_current_security_context());
    109
    110 shell = getenv("SUSHELL");
    111 if (!shell) shell = getenv("sushell");
    112 if (!shell) {
    113 shell = "/bin/sh";
    114 if (pwd->pw_shell[0])
    115 shell = pwd->pw_shell;
    116 }
    117 run_shell(shell, 1, 0, 0);
    118 /* never returns */
    119
    120 auth_error:
    121 bb_error_msg_and_die("no password entry for 'root'");
    122 }