[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * cryptpw.c - output a crypt(3)ed password to stdout.
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| 4 | *
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| 5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 6 | *
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| 7 | * Cooked from passwd.c by Thomas Lundquist <thomasez@zelow.no>
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| 8 | * mkpasswd compatible options added by Bernhard Reutner-Fischer
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| 9 | *
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| 10 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 11 | */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | /* Debian has 'mkpasswd' utility, manpage says:
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| 16 |
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| 17 | NAME
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| 18 | mkpasswd - Overfeatured front end to crypt(3)
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| 19 | SYNOPSIS
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| 20 | mkpasswd PASSWORD SALT
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| 21 | ...
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| 22 | OPTIONS
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| 23 | -S, --salt=STRING
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| 24 | Use the STRING as salt. It must not contain prefixes such as
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| 25 | $1$.
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| 26 | -R, --rounds=NUMBER
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| 27 | Use NUMBER rounds. This argument is ignored if the method
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| 28 | choosen does not support variable rounds. For the OpenBSD Blowfish
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| 29 | method this is the logarithm of the number of rounds.
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| 30 | -m, --method=TYPE
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| 31 | Compute the password using the TYPE method. If TYPE is 'help'
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| 32 | then the available methods are printed.
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| 33 | -P, --password-fd=NUM
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| 34 | Read the password from file descriptor NUM instead of using getpass(3).
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| 35 | If the file descriptor is not connected to a tty then
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| 36 | no other message than the hashed password is printed on stdout.
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| 37 | -s, --stdin
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| 38 | Like --password-fd=0.
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| 39 | ENVIRONMENT
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| 40 | $MKPASSWD_OPTIONS
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| 41 | A list of options which will be evaluated before the ones
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| 42 | specified on the command line.
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| 43 | BUGS
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| 44 | This programs suffers of a bad case of featuritis.
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| 45 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| 46 |
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| 47 | Very true...
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| 48 |
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| 49 | cryptpw was in bbox before this gem, so we retain it, and alias mkpasswd
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| 50 | to cryptpw. -a option (alias for -m) came from cryptpw.
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| 51 | */
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| 52 |
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| 53 | int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 54 | int cryptpw_main(int argc UNUSED_PARAM, char **argv)
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| 55 | {
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| 56 | /* $N$ + sha_salt_16_bytes + NUL */
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| 57 | char salt[3 + 16 + 1];
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| 58 | char *salt_ptr;
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| 59 | const char *opt_m, *opt_S;
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| 60 | int len;
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| 61 | int fd;
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| 62 |
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| 63 | #if ENABLE_LONG_OPTS
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| 64 | static const char mkpasswd_longopts[] ALIGN1 =
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| 65 | "stdin\0" No_argument "s"
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| 66 | "password-fd\0" Required_argument "P"
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| 67 | "salt\0" Required_argument "S"
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| 68 | "method\0" Required_argument "m"
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| 69 | ;
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| 70 | applet_long_options = mkpasswd_longopts;
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| 71 | #endif
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| 72 | fd = STDIN_FILENO;
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| 73 | opt_m = "d";
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| 74 | opt_S = NULL;
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| 75 | /* at most two non-option arguments; -P NUM */
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| 76 | opt_complementary = "?2:P+";
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| 77 | getopt32(argv, "sP:S:m:a:", &fd, &opt_S, &opt_m, &opt_m);
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| 78 | argv += optind;
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| 79 |
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| 80 | /* have no idea how to handle -s... */
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| 81 |
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| 82 | if (argv[0] && !opt_S)
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| 83 | opt_S = argv[1];
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| 84 |
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| 85 | len = 2/2;
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| 86 | salt_ptr = salt;
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| 87 | if (opt_m[0] != 'd') { /* not des */
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| 88 | len = 8/2; /* so far assuming md5 */
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| 89 | *salt_ptr++ = '$';
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| 90 | *salt_ptr++ = '1';
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| 91 | *salt_ptr++ = '$';
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| 92 | #if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
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| 93 | if (opt_m[0] == 's') { /* sha */
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| 94 | salt[1] = '5' + (strcmp(opt_m, "sha512") == 0);
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| 95 | len = 16/2;
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| 96 | }
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| 97 | #endif
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| 98 | }
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| 99 | if (opt_S)
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| 100 | safe_strncpy(salt_ptr, opt_S, sizeof(salt) - 3);
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| 101 | else
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| 102 | crypt_make_salt(salt_ptr, len, 0);
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| 103 |
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| 104 | xmove_fd(fd, STDIN_FILENO);
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| 105 |
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| 106 | puts(pw_encrypt(
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| 107 | argv[0] ? argv[0] : (
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| 108 | /* Only mkpasswd, and only from tty, prompts.
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| 109 | * Otherwise it is a plain read. */
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| 110 | (isatty(STDIN_FILENO) && applet_name[0] == 'm')
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| 111 | ? bb_ask_stdin("Password: ")
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| 112 | : xmalloc_fgetline(stdin)
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| 113 | ),
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| 114 | salt, 1));
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| 115 |
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| 116 | return EXIT_SUCCESS;
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| 117 | }
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