1 /* vi: set sw=4 ts=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 source tree.
8 //config:config CHPASSWD
9 //config: bool "chpasswd (18 kb)"
12 //config: Reads a file of user name and password pairs from standard input
13 //config: and uses this information to update a group of existing users.
15 //config:config FEATURE_DEFAULT_PASSWD_ALGO
16 //config: string "Default encryption method (passwd -a, cryptpw -m, chpasswd -c ALG)"
17 //config: default "des"
18 //config: depends on PASSWD || CRYPTPW || CHPASSWD
20 //config: Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512".
22 //applet:IF_CHPASSWD(APPLET(chpasswd, BB_DIR_USR_SBIN, BB_SUID_DROP))
24 //kbuild:lib-$(CONFIG_CHPASSWD) += chpasswd.o
26 //usage:#define chpasswd_trivial_usage
27 //usage: IF_LONG_OPTS("[--md5|--encrypted|--crypt-method]") IF_NOT_LONG_OPTS("[-m|-e|-c]")
28 //usage:#define chpasswd_full_usage "\n\n"
29 //usage: "Read user:password from stdin and update /etc/passwd\n"
30 //usage: IF_LONG_OPTS(
31 //usage: "\n -e,--encrypted Supplied passwords are in encrypted form"
32 //usage: "\n -m,--md5 Eencrypt using md5, not des"
33 //usage: "\n -c,--crypt-method ALG "CRYPT_METHODS_HELP_STR
35 //usage: IF_NOT_LONG_OPTS(
36 //usage: "\n -e Supplied passwords are in encrypted form"
37 //usage: "\n -m Eencrypt using md5, not des"
38 //usage: "\n -c ALG "CRYPT_METHODS_HELP_STR
44 static const char chpasswd_longopts[] ALIGN1 =
45 "encrypted\0" No_argument "e"
46 "md5\0" No_argument "m"
47 "crypt-method\0" Required_argument "c"
54 int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
55 int chpasswd_main(int argc UNUSED_PARAM, char **argv)
58 const char *algo = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
62 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
64 opt = getopt32long(argv, "^" "emc:" "\0" "m--ec:e--mc:c--em",
69 while ((name = xmalloc_fgetline(stdin)) != NULL) {
74 pass = strchr(name, ':');
76 bb_error_msg_and_die("missing new password");
79 xuname2uid(name); /* dies if there is no such user */
82 if (!(opt & OPT_ENC)) {
83 char salt[MAX_PW_SALT_LEN];
86 /* Force MD5 if the -m flag is set */
90 crypt_make_pw_salt(salt, algo);
91 free_me = pass = pw_encrypt(pass, salt, 0);
94 /* This is rather complex: if user is not found in /etc/shadow,
95 * we try to find & change his passwd in /etc/passwd */
96 #if ENABLE_FEATURE_SHADOWPASSWDS
97 rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
98 if (rc > 0) /* password in /etc/shadow was updated */
101 /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
103 rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
104 /* LOGMODE_BOTH logs to syslog also */
105 logmode = LOGMODE_BOTH;
107 bb_error_msg_and_die("an error occurred updating password for %s", name);
109 bb_error_msg("password for '%s' changed", name);
110 logmode = LOGMODE_STDIO;