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/*
* SPL - The SPL Programming Language
* Copyright (C) 2004, 2005 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* mod_crypt.c: A simple frontend to the C crypt() function
*/
/**
* A crypt() function (like in C).
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "spl.h"
#include "compat.h"
extern void SPL_ABI(spl_mod_crypt_init)(struct spl_vm *vm, struct spl_module *mod, int restore);
extern void SPL_ABI(spl_mod_crypt_done)(struct spl_vm *vm, struct spl_module *mod);
/**
* This function is a frontend to the C crypt() function. If salt is not given
* or shorten then 2 characters then a random salt ([a-zA-Z0-9./]{2}) is used.
*/
// builtin crypt(key, salt)
static struct spl_node *handler_crypt(struct spl_task *task, void *data UNUSED)
{
char *key = spl_clib_get_string(task);
char *salt = spl_clib_get_string(task);
char saltset[] = "abcdefghijklmnnopqrstuvwxyzABCDEFGHIJKLMNNOPQRSTUVWXYZ0123456789./";
unsigned char random_byte;
char random_salt[12];
int generate_md5 = 0;
int i;
if (strlen(salt) == 3 && !strcmp(salt, "$1$"))
generate_md5 = 1;
if (generate_md5 || strlen(salt) < 2)
{
int fd = open("/dev/urandom", O_RDONLY);
if (generate_md5) {
random_salt[0] = salt[0];
random_salt[1] = salt[1];
random_salt[2] = salt[2];
for (i=3; i<11; i++) {
if (fd >= 0) {
read(fd, &random_byte, 1);
random_salt[i] = saltset[random_byte % sizeof(saltset)];
} else
random_salt[i] = 'X';
}
random_salt[11] = 0;
} else {
if (fd >= 0) {
read(fd, &random_byte, 1);
random_salt[0] = saltset[random_byte % sizeof(saltset)];
read(fd, &random_byte, 1);
random_salt[1] = saltset[random_byte % sizeof(saltset)];
} else {
random_salt[0] = 'X';
random_salt[1] = 'X';
}
random_salt[2] = 0;
}
if (fd >= 0)
close(fd);
salt = random_salt;
}
return SPL_NEW_STRING_DUP(crypt(key, salt));
}
void SPL_ABI(spl_mod_crypt_init)(struct spl_vm *vm, struct spl_module *mod UNUSED, int restore UNUSED)
{
spl_clib_reg(vm, "crypt", handler_crypt, 0);
}
void SPL_ABI(spl_mod_crypt_done)(struct spl_vm *vm UNUSED, struct spl_module *mod UNUSED)
{
return;
}
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