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"
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 password encryption method (passwd -a, cryptpw -m parameter)"
17 //config: default "des"
18 //config: depends on PASSWD || CRYPTPW
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 Use MD5 encryption instead of DES"
33 //usage: "\n -c,--crypt-method Use the specified method to encrypt the passwords"
35 //usage: IF_NOT_LONG_OPTS(
36 //usage: "\n -e Supplied passwords are in encrypted form"
37 //usage: "\n -m Use MD5 encryption instead of DES"
38 //usage: "\n -c Use the specified method to encrypt the passwords"
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_complementary
= "m--ec:e--mc:c--em";
65 IF_LONG_OPTS(applet_long_options
= chpasswd_longopts
;)
66 opt
= getopt32(argv
, "emc:", &algo
);
68 while ((name
= xmalloc_fgetline(stdin
)) != NULL
) {
73 pass
= strchr(name
, ':');
75 bb_error_msg_and_die("missing new password");
78 xuname2uid(name
); /* dies if there is no such user */
81 if (!(opt
& OPT_ENC
)) {
82 char salt
[MAX_PW_SALT_LEN
];
85 /* Force MD5 if the -m flag is set */
89 crypt_make_pw_salt(salt
, algo
);
90 free_me
= pass
= pw_encrypt(pass
, salt
, 0);
93 /* This is rather complex: if user is not found in /etc/shadow,
94 * we try to find & change his passwd in /etc/passwd */
95 #if ENABLE_FEATURE_SHADOWPASSWDS
96 rc
= update_passwd(bb_path_shadow_file
, name
, pass
, NULL
);
97 if (rc
> 0) /* password in /etc/shadow was updated */
100 /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
102 rc
= update_passwd(bb_path_passwd_file
, name
, pass
, NULL
);
103 /* LOGMODE_BOTH logs to syslog also */
104 logmode
= LOGMODE_BOTH
;
106 bb_error_msg_and_die("an error occurred updating password for %s", name
);
108 bb_error_msg("password for '%s' changed", name
);
109 logmode
= LOGMODE_STDIO
;