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 tarball for details.
   7  */
   8
   9 #include "libbb.h"
  10
  11 #if ENABLE_GETOPT_LONG
  12 #include <getopt.h>
  13
  14 static const struct option chpasswd_opts[] = {
  15         { "encrypted", no_argument, NULL, 'e' },
  16         { "md5", no_argument, NULL, 'm' },
  17         { NULL, 0, NULL, 0 }
  18 };
  19 #endif
  20
  21 #define OPT_ENC         1
  22 #define OPT_MD5         2
  23
  24 int chpasswd_main(int argc, char **argv);
  25 int chpasswd_main(int argc, char **argv)
  26 {
  27         char *name, *pass;
  28         char salt[sizeof("$N$XXXXXXXX")];
  29         int opt;
  30         int rnd = rnd; /* we *want* it to be non-initialized! */
  31
  32         if (getuid())
  33                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  34
  35         opt_complementary = "?m--e:e--m";
  36         USE_GETOPT_LONG(applet_long_options = chpasswd_opts;)
  37         opt = getopt32(argc, argv, "em");
  38
  39         while ((name = xmalloc_getline(stdin)) != NULL) {
  40                 pass = strchr(name, ':');
  41                 if (!pass)
  42                         bb_error_msg_and_die("missing new password");
  43                 *pass++ = '\0';
  44
  45                 xuname2uid(name); /* dies if there is no such user */
  46
  47                 if (!(opt & OPT_ENC)) {
  48                         rnd = crypt_make_salt(salt, 1, rnd);
  49                         if (opt & OPT_MD5) {
  50                                 strcpy(salt, "$1$");
  51                                 rnd = crypt_make_salt(salt + 3, 4, rnd);
  52                         }
  53                         pass = pw_encrypt(pass, salt);
  54                 }
  55
  56                 /* LOGMODE_BOTH logs to syslog */
  57                 logmode = LOGMODE_BOTH;
  58
  59                 if ((ENABLE_FEATURE_SHADOWPASSWDS
  60                         && !update_passwd(bb_path_shadow_file, name, pass))
  61                         || !update_passwd(bb_path_passwd_file, name, pass)
  62                 ) {
  63                         bb_error_msg_and_die("an error occurred updating password for %s", name);
  64                 } else {
  65                         bb_info_msg("Password for '%s' changed", name);
  66                 }
  67                 logmode = LOGMODE_STDIO;
  68                 free(name);
  69         }
  70
  71         return 0;
  72 }