118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* cryptpw.c - output a crypt(3)ed password to stdout.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
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* Cooked from passwd.c by Thomas Lundquist <thomasez@zelow.no>
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* mkpasswd compatible options added by Bernhard Reutner-Fischer
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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/* Debian has 'mkpasswd' utility, manpage says:
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NAME
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mkpasswd - Overfeatured front end to crypt(3)
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SYNOPSIS
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mkpasswd PASSWORD SALT
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...
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OPTIONS
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-S, --salt=STRING
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Use the STRING as salt. It must not contain prefixes such as
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$1$.
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-R, --rounds=NUMBER
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Use NUMBER rounds. This argument is ignored if the method
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choosen does not support variable rounds. For the OpenBSD Blowfish
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method this is the logarithm of the number of rounds.
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-m, --method=TYPE
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Compute the password using the TYPE method. If TYPE is 'help'
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then the available methods are printed.
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-P, --password-fd=NUM
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Read the password from file descriptor NUM instead of using getpass(3).
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If the file descriptor is not connected to a tty then
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no other message than the hashed password is printed on stdout.
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-s, --stdin
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Like --password-fd=0.
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ENVIRONMENT
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$MKPASSWD_OPTIONS
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A list of options which will be evaluated before the ones
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specified on the command line.
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BUGS
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This programs suffers of a bad case of featuritis.
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Very true...
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cryptpw was in bbox before this gem, so we retain it, and alias mkpasswd
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to cryptpw. -a option (alias for -m) came from cryptpw.
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*/
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int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int cryptpw_main(int argc UNUSED_PARAM, char **argv)
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{
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/* $N$ + sha_salt_16_bytes + NUL */
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char salt[3 + 16 + 1];
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char *salt_ptr;
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const char *opt_m, *opt_S;
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int len;
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int fd;
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#if ENABLE_LONG_OPTS
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static const char mkpasswd_longopts[] ALIGN1 =
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"stdin\0" No_argument "s"
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"password-fd\0" Required_argument "P"
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"salt\0" Required_argument "S"
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"method\0" Required_argument "m"
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;
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applet_long_options = mkpasswd_longopts;
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#endif
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fd = STDIN_FILENO;
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opt_m = "d";
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opt_S = NULL;
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/* at most two non-option arguments; -P NUM */
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opt_complementary = "?2:P+";
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getopt32(argv, "sP:S:m:a:", &fd, &opt_S, &opt_m, &opt_m);
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argv += optind;
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/* have no idea how to handle -s... */
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if (argv[0] && !opt_S)
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opt_S = argv[1];
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len = 2/2;
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salt_ptr = salt;
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if (opt_m[0] != 'd') { /* not des */
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len = 8/2; /* so far assuming md5 */
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*salt_ptr++ = '$';
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*salt_ptr++ = '1';
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*salt_ptr++ = '$';
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#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
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if (opt_m[0] == 's') { /* sha */
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salt[1] = '5' + (strcmp(opt_m, "sha512") == 0);
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len = 16/2;
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}
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#endif
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}
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if (opt_S)
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safe_strncpy(salt_ptr, opt_S, sizeof(salt) - 3);
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else
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crypt_make_salt(salt_ptr, len, 0);
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xmove_fd(fd, STDIN_FILENO);
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puts(pw_encrypt(
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argv[0] ? argv[0] : (
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/* Only mkpasswd, and only from tty, prompts.
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* Otherwise it is a plain read. */
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(isatty(STDIN_FILENO) && applet_name[0] == 'm')
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? bb_ask_stdin("Password: ")
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: xmalloc_fgetline(stdin)
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),
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salt, 1));
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return EXIT_SUCCESS;
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}
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