busybox/loginutils/cryptpw.c
Denys Vlasenko 237bedd499 getopt32: add new syntax of 'o:+' and 'o:*' for -o NUM and -o LIST
In many cases, this aqllows to drop use of opt_complementary.
Approximately -400 bytes:

function                                             old     new   delta
getopt32                                            1423    1502     +79
opt_string                                            17      18      +1
OPT_STR                                               24      25      +1
uniq_main                                            416     406     -10
timeout_main                                         279     269     -10
sulogin_main                                         270     260     -10
readprofile_main                                    1825    1815     -10
ps_main                                              543     533     -10
pidof_main                                           245     235     -10
pgrep_main                                           611     601     -10
od_main                                             2600    2590     -10
mkfs_minix_main                                     2684    2674     -10
mkfs_ext2_main                                      2603    2593     -10
microcom_main                                        712     702     -10
makemime_main                                        315     305     -10
ionice_main                                          282     272     -10
inetd_main                                          2074    2064     -10
ifplugd_main                                        1144    1134     -10
halt_main                                            353     343     -10
getopt_main                                          636     626     -10
fdisk_main                                          2854    2844     -10
env_main                                             206     196     -10
dmesg_main                                           319     309     -10
conspy_main                                         1214    1204     -10
awk_main                                             981     971     -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/22 up/down: 81/-220)         Total: -139 bytes
   text	   data	    bss	    dec	    hex	filename
 919373	    906	  14060	 934339	  e41c3	busybox_old
 918969	    906	  14060	 933935	  e402f	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-07-06 21:58:02 +02:00

145 lines
4.4 KiB
C

/* vi: set sw=4 ts=4: */
/*
* cryptpw.c - output a crypt(3)ed password to stdout.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Cooked from passwd.c by Thomas Lundquist <thomasez@zelow.no>
* mkpasswd compatible options added by Bernhard Reutner-Fischer
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config CRYPTPW
//config: bool "cryptpw"
//config: default y
//config: help
//config: Encrypts the given password with the crypt(3) libc function
//config: using the given salt.
//config:
//config:config MKPASSWD
//config: bool "mkpasswd"
//config: default y
//config: help
//config: Encrypts the given password with the crypt(3) libc function
//config: using the given salt. Debian has this utility under mkpasswd
//config: name. Busybox provides mkpasswd as an alias for cryptpw.
//applet:IF_CRYPTPW(APPLET(cryptpw, BB_DIR_USR_BIN, BB_SUID_DROP))
// APPLET_ODDNAME:name main location suid_type help
//applet:IF_MKPASSWD(APPLET_ODDNAME(mkpasswd, cryptpw, BB_DIR_USR_BIN, BB_SUID_DROP, cryptpw))
//kbuild:lib-$(CONFIG_CRYPTPW) += cryptpw.o
//kbuild:lib-$(CONFIG_MKPASSWD) += cryptpw.o
//usage:#define cryptpw_trivial_usage
//usage: "[OPTIONS] [PASSWORD] [SALT]"
/* We do support -s, we just don't mention it */
//usage:#define cryptpw_full_usage "\n\n"
//usage: "Crypt PASSWORD using crypt(3)\n"
//usage: IF_LONG_OPTS(
//usage: "\n -P,--password-fd=N Read password from fd N"
/* //usage: "\n -s,--stdin Use stdin; like -P0" */
//usage: "\n -m,--method=TYPE Encryption method"
//usage: "\n -S,--salt=SALT"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -P N Read password from fd N"
/* //usage: "\n -s Use stdin; like -P0" */
//usage: "\n -m TYPE Encryption method TYPE"
//usage: "\n -S SALT"
//usage: )
#include "libbb.h"
/* Debian has 'mkpasswd' utility, manpage says:
NAME
mkpasswd - Overfeatured front end to crypt(3)
SYNOPSIS
mkpasswd PASSWORD SALT
...
OPTIONS
-S, --salt=STRING
Use the STRING as salt. It must not contain prefixes such as
$1$.
-R, --rounds=NUMBER
Use NUMBER rounds. This argument is ignored if the method
choosen does not support variable rounds. For the OpenBSD Blowfish
method this is the logarithm of the number of rounds.
-m, --method=TYPE
Compute the password using the TYPE method. If TYPE is 'help'
then the available methods are printed.
-P, --password-fd=NUM
Read the password from file descriptor NUM instead of using getpass(3).
If the file descriptor is not connected to a tty then
no other message than the hashed password is printed on stdout.
-s, --stdin
Like --password-fd=0.
ENVIRONMENT
$MKPASSWD_OPTIONS
A list of options which will be evaluated before the ones
specified on the command line.
BUGS
This programs suffers of a bad case of featuritis.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Very true...
cryptpw was in bbox before this gem, so we retain it, and alias mkpasswd
to cryptpw. -a option (alias for -m) came from cryptpw.
*/
int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cryptpw_main(int argc UNUSED_PARAM, char **argv)
{
char salt[MAX_PW_SALT_LEN];
char *salt_ptr;
char *password;
const char *opt_m, *opt_S;
int fd;
#if ENABLE_LONG_OPTS
static const char mkpasswd_longopts[] ALIGN1 =
"stdin\0" No_argument "s"
"password-fd\0" Required_argument "P"
"salt\0" Required_argument "S"
"method\0" Required_argument "m"
;
applet_long_options = mkpasswd_longopts;
#endif
fd = STDIN_FILENO;
opt_m = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
opt_S = NULL;
/* at most two non-option arguments; -P NUM */
opt_complementary = "?2";
getopt32(argv, "sP:+S:m:a:", &fd, &opt_S, &opt_m, &opt_m);
argv += optind;
/* have no idea how to handle -s... */
if (argv[0] && !opt_S)
opt_S = argv[1];
salt_ptr = crypt_make_pw_salt(salt, opt_m);
if (opt_S)
safe_strncpy(salt_ptr, opt_S, sizeof(salt) - (sizeof("$N$")-1));
xmove_fd(fd, STDIN_FILENO);
password = argv[0];
if (!password) {
/* Only mkpasswd, and only from tty, prompts.
* Otherwise it is a plain read. */
password = (ENABLE_MKPASSWD && isatty(STDIN_FILENO) && applet_name[0] == 'm')
? bb_ask_stdin("Password: ")
: xmalloc_fgetline(stdin)
;
/* may still be NULL on EOF/error */
}
if (password)
puts(pw_encrypt(password, salt, 1));
return EXIT_SUCCESS;
}