| /* 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|--root]") IF_NOT_LONG_OPTS("[-m|-e|-c|-R]") |
| //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 Encrypt using md5, not des" |
| //usage: "\n -c,--crypt-method ALG "CRYPT_METHODS_HELP_STR |
| //usage: "\n -R,--root DIR Directory to chroot into" |
| //usage: ) |
| //usage: IF_NOT_LONG_OPTS( |
| //usage: "\n -e Supplied passwords are in encrypted form" |
| //usage: "\n -m Encrypt using md5, not des" |
| //usage: "\n -c ALG "CRYPT_METHODS_HELP_STR |
| //usage: "\n -R DIR Directory to chroot into" |
| //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" |
| "root\0" Required_argument "R" |
| ; |
| #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; |
| const char *root = NULL; |
| int opt; |
| |
| if (getuid() != 0) |
| bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
| |
| opt = getopt32long(argv, "^" "emc:R:" "\0" "m--ec:e--mc:c--em", |
| chpasswd_longopts, |
| &algo, &root |
| ); |
| |
| if (root) { |
| xchroot(root); |
| } |
| |
| 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; |
| } |