release/src/router/busybox/loginutils/chpasswd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * chpasswd.c
   4  *
   5  * Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
   6  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   7  */
   8 #include "libbb.h"
   9
  10 #if ENABLE_LONG_OPTS
  11 static const char chpasswd_longopts[] ALIGN1 =
  12         "encrypted\0" No_argument "e"
  13         "md5\0"       No_argument "m"
  14         ;
  15 #endif
  16
  17 #define OPT_ENC  1
  18 #define OPT_MD5  2
  19
  20 int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21 int chpasswd_main(int argc UNUSED_PARAM, char **argv)
  22 {
  23         char *name, *pass;
  24         char salt[sizeof("$N$XXXXXXXX")];
  25         int opt, rc;
  26         int rnd = rnd; /* we *want* it to be non-initialized! */
  27
  28         if (getuid())
  29                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  30
  31         opt_complementary = "m--e:e--m";
  32         IF_LONG_OPTS(applet_long_options = chpasswd_longopts;)
  33         opt = getopt32(argv, "em");
  34
  35         while ((name = xmalloc_fgetline(stdin)) != NULL) {
  36                 pass = strchr(name, ':');
  37                 if (!pass)
  38                         bb_error_msg_and_die("missing new password");
  39                 *pass++ = '\0';
  40
  41                 xuname2uid(name); /* dies if there is no such user */
  42
  43                 if (!(opt & OPT_ENC)) {
  44                         rnd = crypt_make_salt(salt, 1, rnd);
  45                         if (opt & OPT_MD5) {
  46                                 strcpy(salt, "$1$");
  47                                 rnd = crypt_make_salt(salt + 3, 4, rnd);
  48                         }
  49                         pass = pw_encrypt(pass, salt, 0);
  50                 }
  51
  52                 /* This is rather complex: if user is not found in /etc/shadow,
  53                  * we try to find & change his passwd in /etc/passwd */
  54 #if ENABLE_FEATURE_SHADOWPASSWDS
  55                 rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
  56                 if (rc == 0) /* no lines updated, no errors detected */
  57 #endif
  58                         rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
  59                 /* LOGMODE_BOTH logs to syslog also */
  60                 logmode = LOGMODE_BOTH;
  61                 if (rc < 0)
  62                         bb_error_msg_and_die("an error occurred updating password for %s", name);
  63                 if (rc)
  64                         bb_info_msg("Password for '%s' changed", name);
  65                 logmode = LOGMODE_STDIO;
  66                 free(name);
  67                 if (!(opt & OPT_ENC))
  68                         free(pass);
  69         }
  70         return EXIT_SUCCESS;
  71 }