1 /* vi: set sw=4 ts=4: */
3 * cryptpw.c - output a crypt(3)ed password to stdout.
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 * Cooked from passwd.c by Thomas Lundquist <thomasez@zelow.no>
8 * mkpasswd compatible options added by Bernhard Reutner-Fischer
10 * Licensed under GPLv2, see file LICENSE in this source tree.
12 //config:config CRYPTPW
13 //config: bool "cryptpw"
16 //config: Encrypts the given password with the crypt(3) libc function
17 //config: using the given salt.
19 //config:config MKPASSWD
20 //config: bool "mkpasswd"
23 //config: Encrypts the given password with the crypt(3) libc function
24 //config: using the given salt. Debian has this utility under mkpasswd
25 //config: name. Busybox provides mkpasswd as an alias for cryptpw.
27 //applet:IF_CRYPTPW(APPLET(cryptpw, BB_DIR_USR_BIN, BB_SUID_DROP))
28 // APPLET_ODDNAME:name main location suid_type help
29 //applet:IF_MKPASSWD(APPLET_ODDNAME(mkpasswd, cryptpw, BB_DIR_USR_BIN, BB_SUID_DROP, cryptpw))
31 //kbuild:lib-$(CONFIG_CRYPTPW) += cryptpw.o
32 //kbuild:lib-$(CONFIG_MKPASSWD) += cryptpw.o
34 //usage:#define cryptpw_trivial_usage
35 //usage: "[OPTIONS] [PASSWORD] [SALT]"
36 /* We do support -s, we just don't mention it */
37 //usage:#define cryptpw_full_usage "\n\n"
38 //usage: "Crypt PASSWORD using crypt(3)\n"
39 //usage: IF_LONG_OPTS(
40 //usage: "\n -P,--password-fd=N Read password from fd N"
41 /* //usage: "\n -s,--stdin Use stdin; like -P0" */
42 //usage: "\n -m,--method=TYPE Encryption method"
43 //usage: "\n -S,--salt=SALT"
45 //usage: IF_NOT_LONG_OPTS(
46 //usage: "\n -P N Read password from fd N"
47 /* //usage: "\n -s Use stdin; like -P0" */
48 //usage: "\n -m TYPE Encryption method TYPE"
54 /* Debian has 'mkpasswd' utility, manpage says:
57 mkpasswd - Overfeatured front end to crypt(3)
59 mkpasswd PASSWORD SALT
63 Use the STRING as salt. It must not contain prefixes such as
66 Use NUMBER rounds. This argument is ignored if the method
67 choosen does not support variable rounds. For the OpenBSD Blowfish
68 method this is the logarithm of the number of rounds.
70 Compute the password using the TYPE method. If TYPE is 'help'
71 then the available methods are printed.
73 Read the password from file descriptor NUM instead of using getpass(3).
74 If the file descriptor is not connected to a tty then
75 no other message than the hashed password is printed on stdout.
80 A list of options which will be evaluated before the ones
81 specified on the command line.
83 This programs suffers of a bad case of featuritis.
84 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
88 cryptpw was in bbox before this gem, so we retain it, and alias mkpasswd
89 to cryptpw. -a option (alias for -m) came from cryptpw.
92 int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93 int cryptpw_main(int argc UNUSED_PARAM, char **argv)
95 char salt[MAX_PW_SALT_LEN];
98 const char *opt_m, *opt_S;
102 static const char mkpasswd_longopts[] ALIGN1 =
103 "stdin\0" No_argument "s"
104 "password-fd\0" Required_argument "P"
105 "salt\0" Required_argument "S"
106 "method\0" Required_argument "m"
108 applet_long_options = mkpasswd_longopts;
111 opt_m = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
113 /* at most two non-option arguments; -P NUM */
114 opt_complementary = "?2";
115 getopt32(argv, "sP:+S:m:a:", &fd, &opt_S, &opt_m, &opt_m);
118 /* have no idea how to handle -s... */
120 if (argv[0] && !opt_S)
123 salt_ptr = crypt_make_pw_salt(salt, opt_m);
125 safe_strncpy(salt_ptr, opt_S, sizeof(salt) - (sizeof("$N$")-1));
127 xmove_fd(fd, STDIN_FILENO);
131 /* Only mkpasswd, and only from tty, prompts.
132 * Otherwise it is a plain read. */
133 password = (ENABLE_MKPASSWD && isatty(STDIN_FILENO) && applet_name[0] == 'm')
134 ? bb_ask_stdin("Password: ")
135 : xmalloc_fgetline(stdin)
137 /* may still be NULL on EOF/error */
141 puts(pw_encrypt(password, salt, 1));