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

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * cryptpw.c - output a crypt(3)ed password to stdout.
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  *
   7  * Cooked from passwd.c by Thomas Lundquist <thomasez@zelow.no>
   8  * mkpasswd compatible options added by Bernhard Reutner-Fischer
   9  *
  10  * Licensed under GPLv2, see file LICENSE in this source tree.
  11  */
  12
  13 //usage:#define cryptpw_trivial_usage
  14 //usage:       "[OPTIONS] [PASSWORD] [SALT]"
  15 /* We do support -s, we just don't mention it */
  16 //usage:#define cryptpw_full_usage "\n\n"
  17 //usage:       "Crypt PASSWORD using crypt(3)\n"
  18 //usage:        IF_LONG_OPTS(
  19 //usage:     "\n        -P,--password-fd=N      Read password from fd N"
  20 /* //usage:  "\n        -s,--stdin              Use stdin; like -P0" */
  21 //usage:     "\n        -m,--method=TYPE        Encryption method"
  22 //usage:     "\n        -S,--salt=SALT"
  23 //usage:        )
  24 //usage:        IF_NOT_LONG_OPTS(
  25 //usage:     "\n        -P N    Read password from fd N"
  26 /* //usage:  "\n        -s      Use stdin; like -P0" */
  27 //usage:     "\n        -m TYPE Encryption method TYPE"
  28 //usage:     "\n        -S SALT"
  29 //usage:        )
  30
  31 /* mkpasswd is an alias to cryptpw */
  32 //usage:#define mkpasswd_trivial_usage
  33 //usage:       "[OPTIONS] [PASSWORD] [SALT]"
  34 /* We do support -s, we just don't mention it */
  35 //usage:#define mkpasswd_full_usage "\n\n"
  36 //usage:       "Crypt PASSWORD using crypt(3)\n"
  37 //usage:        IF_LONG_OPTS(
  38 //usage:     "\n        -P,--password-fd=N      Read password from fd N"
  39 /* //usage:  "\n        -s,--stdin              Use stdin; like -P0" */
  40 //usage:     "\n        -m,--method=TYPE        Encryption method"
  41 //usage:     "\n        -S,--salt=SALT"
  42 //usage:        )
  43 //usage:        IF_NOT_LONG_OPTS(
  44 //usage:     "\n        -P N    Read password from fd N"
  45 /* //usage:  "\n        -s      Use stdin; like -P0" */
  46 //usage:     "\n        -m TYPE Encryption method TYPE"
  47 //usage:     "\n        -S SALT"
  48 //usage:        )
  49
  50 #include "libbb.h"
  51
  52 /* Debian has 'mkpasswd' utility, manpage says:
  53
  54 NAME
  55     mkpasswd - Overfeatured front end to crypt(3)
  56 SYNOPSIS
  57     mkpasswd PASSWORD SALT
  58 ...
  59 OPTIONS
  60 -S, --salt=STRING
  61     Use the STRING as salt. It must not  contain  prefixes  such  as
  62     $1$.
  63 -R, --rounds=NUMBER
  64     Use NUMBER rounds. This argument is ignored if the method
  65     choosen does not support variable rounds. For the OpenBSD Blowfish
  66     method this is the logarithm of the number of rounds.
  67 -m, --method=TYPE
  68     Compute the password using the TYPE method. If TYPE is 'help'
  69     then the available methods are printed.
  70 -P, --password-fd=NUM
  71     Read the password from file descriptor NUM instead of using getpass(3).
  72     If the file descriptor is not connected to a tty then
  73     no other message than the hashed password is printed on stdout.
  74 -s, --stdin
  75     Like --password-fd=0.
  76 ENVIRONMENT
  77     $MKPASSWD_OPTIONS
  78     A list of options which will be evaluated before the ones
  79     specified on the command line.
  80 BUGS
  81     This programs suffers of a bad case of featuritis.
  82     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  83
  84 Very true...
  85
  86 cryptpw was in bbox before this gem, so we retain it, and alias mkpasswd
  87 to cryptpw. -a option (alias for -m) came from cryptpw.
  88 */
  89
  90 int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  91 int cryptpw_main(int argc UNUSED_PARAM, char **argv)
  92 {
  93         char salt[MAX_PW_SALT_LEN];
  94         char *salt_ptr;
  95         char *password;
  96         const char *opt_m, *opt_S;
  97         int fd;
  98
  99 #if ENABLE_LONG_OPTS
 100         static const char mkpasswd_longopts[] ALIGN1 =
 101                 "stdin\0"       No_argument       "s"
 102                 "password-fd\0" Required_argument "P"
 103                 "salt\0"        Required_argument "S"
 104                 "method\0"      Required_argument "m"
 105         ;
 106         applet_long_options = mkpasswd_longopts;
 107 #endif
 108         fd = STDIN_FILENO;
 109         opt_m = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
 110         opt_S = NULL;
 111         /* at most two non-option arguments; -P NUM */
 112         opt_complementary = "?2:P+";
 113         getopt32(argv, "sP:S:m:a:", &fd, &opt_S, &opt_m, &opt_m);
 114         argv += optind;
 115
 116         /* have no idea how to handle -s... */
 117
 118         if (argv[0] && !opt_S)
 119                 opt_S = argv[1];
 120
 121         salt_ptr = crypt_make_pw_salt(salt, opt_m);
 122         if (opt_S)
 123                 safe_strncpy(salt_ptr, opt_S, sizeof(salt) - (sizeof("$N$")-1));
 124
 125         xmove_fd(fd, STDIN_FILENO);
 126
 127         password = argv[0];
 128         if (!password) {
 129                 /* Only mkpasswd, and only from tty, prompts.
 130                  * Otherwise it is a plain read. */
 131                 password = (isatty(STDIN_FILENO) && applet_name[0] == 'm')
 132                         ? bb_ask_stdin("Password: ")
 133                         : xmalloc_fgetline(stdin)
 134                 ;
 135                 /* may still be NULL on EOF/error */
 136         }
 137
 138         if (password)
 139                 puts(pw_encrypt(password, salt, 1));
 140
 141         return EXIT_SUCCESS;
 142 }