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/* vi: set sw=4 ts=4: */
/*
* chpasswd.c
*
* Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config CHPASSWD
//config: bool "chpasswd (18 kb)"
//config: default y
//config: help
//config: Reads a file of user name and password pairs from standard input
//config: and uses this information to update a group of existing users.
//config:
//config:config FEATURE_DEFAULT_PASSWD_ALGO
//config: string "Default encryption method (passwd -a, cryptpw -m, chpasswd -c ALG)"
//config: default "des"
//config: depends on PASSWD || CRYPTPW || CHPASSWD
//config: help
//config: Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512".
//applet:IF_CHPASSWD(APPLET(chpasswd, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_CHPASSWD) += chpasswd.o
//usage:#define chpasswd_trivial_usage
//usage: IF_LONG_OPTS("[--md5|--encrypted|--crypt-method]") IF_NOT_LONG_OPTS("[-m|-e|-c]")
//usage:#define chpasswd_full_usage "\n\n"
//usage: "Read user:password from stdin and update /etc/passwd\n"
//usage: IF_LONG_OPTS(
//usage: "\n -e,--encrypted Supplied passwords are in encrypted form"
//usage: "\n -m,--md5 Eencrypt using md5, not des"
//usage: "\n -c,--crypt-method ALG "CRYPT_METHODS_HELP_STR
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -e Supplied passwords are in encrypted form"
//usage: "\n -m Eencrypt using md5, not des"
//usage: "\n -c ALG "CRYPT_METHODS_HELP_STR
//usage: )
#include "libbb.h"
#if ENABLE_LONG_OPTS
static const char chpasswd_longopts[] ALIGN1 =
"encrypted\0" No_argument "e"
"md5\0" No_argument "m"
"crypt-method\0" Required_argument "c"
;
#endif
#define OPT_ENC 1
#define OPT_MD5 2
int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chpasswd_main(int argc UNUSED_PARAM, char **argv)
{
char *name;
const char *algo = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
int opt;
if (getuid() != 0)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
opt_complementary = "m--ec:e--mc:c--em";
opt = getopt32long(argv, "emc:", chpasswd_longopts, &algo);
while ((name = xmalloc_fgetline(stdin)) != NULL) {
char *free_me;
char *pass;
int rc;
pass = strchr(name, ':');
if (!pass)
bb_error_msg_and_die("missing new password");
*pass++ = '\0';
xuname2uid(name); /* dies if there is no such user */
free_me = NULL;
if (!(opt & OPT_ENC)) {
char salt[MAX_PW_SALT_LEN];
if (opt & OPT_MD5) {
/* Force MD5 if the -m flag is set */
algo = "md5";
}
crypt_make_pw_salt(salt, algo);
free_me = pass = pw_encrypt(pass, salt, 0);
}
/* This is rather complex: if user is not found in /etc/shadow,
* we try to find & change his passwd in /etc/passwd */
#if ENABLE_FEATURE_SHADOWPASSWDS
rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
if (rc > 0) /* password in /etc/shadow was updated */
pass = (char*)"x";
if (rc >= 0)
/* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
#endif
rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
/* LOGMODE_BOTH logs to syslog also */
logmode = LOGMODE_BOTH;
if (rc < 0)
bb_error_msg_and_die("an error occurred updating password for %s", name);
if (rc)
bb_error_msg("password for '%s' changed", name);
logmode = LOGMODE_STDIO;
free(name);
free(free_me);
}
return EXIT_SUCCESS;
}
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