crypt.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Stig Bakken <ssb@php.net>                                   |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Rasmus Lerdorf <rasmus@php.net>                             |
   |          Pierre Joye <pierre@php.net>                                |
   +----------------------------------------------------------------------+
*/
 
#include <stdlib.h>
 
#include "php.h"
 
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if PHP_USE_PHP_CRYPT_R
# include "php_crypt_r.h"
# include "crypt_freesec.h"
#else
# ifdef HAVE_CRYPT_H
#  if defined(CRYPT_R_GNU_SOURCE) && !defined(_GNU_SOURCE)
#   define _GNU_SOURCE
#  endif
#  include <crypt.h>
# endif
#endif
#include <time.h>
#include <string.h>
 
#ifdef PHP_WIN32
#include <process.h>
#endif
 
#include "php_crypt.h"
 
/* Used to check DES salts to ensure that they contain only valid characters */
#define IS_VALID_SALT_CHARACTER(c) (((c) >= '.' && (c) <= '9') || ((c) >= 'A' && (c) <= 'Z') || ((c) >= 'a' && (c) <= 'z'))
 
PHP_MINIT_FUNCTION(crypt) /* {{{ */
{
#if PHP_USE_PHP_CRYPT_R
    php_init_crypt_r();
#endif
 
    return SUCCESS;
}
/* }}} */
 
PHP_MSHUTDOWN_FUNCTION(crypt) /* {{{ */
{
#if PHP_USE_PHP_CRYPT_R
    php_shutdown_crypt_r();
#endif
 
    return SUCCESS;
}
/* }}} */
 
PHPAPI zend_string *php_crypt(const char *password, const int pass_len, const char *salt, int salt_len, bool quiet)
{
    char *crypt_res;
    zend_string *result;
 
    if (salt[0] == '*' && (salt[1] == '0' || salt[1] == '1')) {
        return NULL;
    }
 
/* Windows (win32/crypt) has a stripped down version of libxcrypt and
    a CryptoApi md5_crypt implementation */
#if PHP_USE_PHP_CRYPT_R
    {
        struct php_crypt_extended_data buffer;
 
        if (salt[0]=='$' && salt[1]=='1' && salt[2]=='$') {
            char output[MD5_HASH_MAX_LEN], *out;
 
            out = php_md5_crypt_r(password, salt, output);
            if (out) {
                return zend_string_init(out, strlen(out), 0);
            }
            return NULL;
        } else if (salt[0]=='$' && salt[1]=='6' && salt[2]=='$') {
            char *output;
            output = emalloc(PHP_MAX_SALT_LEN);
 
            crypt_res = php_sha512_crypt_r(password, salt, output, PHP_MAX_SALT_LEN);
            if (!crypt_res) {
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN);
                efree(output);
                return NULL;
            } else {
                result = zend_string_init(output, strlen(output), 0);
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN);
                efree(output);
                return result;
            }
        } else if (salt[0]=='$' && salt[1]=='5' && salt[2]=='$') {
            char *output;
            output = emalloc(PHP_MAX_SALT_LEN);
 
            crypt_res = php_sha256_crypt_r(password, salt, output, PHP_MAX_SALT_LEN);
            if (!crypt_res) {
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN);
                efree(output);
                return NULL;
            } else {
                result = zend_string_init(output, strlen(output), 0);
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN);
                efree(output);
                return result;
            }
        } else if (
                salt[0] == '$' &&
                salt[1] == '2' &&
                salt[2] != 0 &&
                salt[3] == '$') {
            char output[PHP_MAX_SALT_LEN + 1];
 
            memset(output, 0, PHP_MAX_SALT_LEN + 1);
 
            crypt_res = php_crypt_blowfish_rn(password, salt, output, sizeof(output));
            if (!crypt_res) {
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN + 1);
                return NULL;
            } else {
                result = zend_string_init(output, strlen(output), 0);
                ZEND_SECURE_ZERO(output, PHP_MAX_SALT_LEN + 1);
                return result;
            }
        } else if (salt[0] == '_'
                || (IS_VALID_SALT_CHARACTER(salt[0]) && IS_VALID_SALT_CHARACTER(salt[1]))) {
            /* DES Fallback */
            memset(&buffer, 0, sizeof(buffer));
            _crypt_extended_init_r();
 
            crypt_res = _crypt_extended_r((const unsigned char *) password, salt, &buffer);
            if (!crypt_res || (salt[0] == '*' && salt[1] == '0')) {
                return NULL;
            } else {
                result = zend_string_init(crypt_res, strlen(crypt_res), 0);
                return result;
            }
        } else {
            /* Unknown hash type */
            return NULL;
        }
    }
#else
 
# if defined(HAVE_CRYPT_R) && (defined(_REENTRANT) || defined(_THREAD_SAFE))
#  if defined(CRYPT_R_STRUCT_CRYPT_DATA)
    struct crypt_data buffer;
    memset(&buffer, 0, sizeof(buffer));
#  elif defined(CRYPT_R_CRYPTD)
    CRYPTD buffer;
#  else
#   error Data struct used by crypt_r() is unknown. Please report.
#  endif
    crypt_res = crypt_r(password, salt, &buffer);
# elif defined(HAVE_CRYPT)
    crypt_res = crypt(password, salt);
# else
#  error No crypt() implementation
# endif
#endif
 
    if (!crypt_res || (salt[0] == '*' && salt[1] == '0')) {
        return NULL;
    } else {
        result = zend_string_init(crypt_res, strlen(crypt_res), 0);
        return result;
    }
}
/* }}} */
 
 
/* {{{ Hash a string */
PHP_FUNCTION(crypt)
{
    char salt[PHP_MAX_SALT_LEN + 1];
    char *str, *salt_in = NULL;
    size_t str_len, salt_in_len = 0;
    zend_string *result;
 
    ZEND_PARSE_PARAMETERS_START(2, 2)
        Z_PARAM_STRING(str, str_len)
        Z_PARAM_STRING(salt_in, salt_in_len)
    ZEND_PARSE_PARAMETERS_END();
 
    salt[0] = salt[PHP_MAX_SALT_LEN] = '\0';
 
    /* This will produce suitable results if people depend on DES-encryption
     * available (passing always 2-character salt). At least for glibc6.1 */
    memset(&salt[1], '$', PHP_MAX_SALT_LEN - 1);
    memcpy(salt, salt_in, MIN(PHP_MAX_SALT_LEN, salt_in_len));
 
    salt_in_len = MIN(PHP_MAX_SALT_LEN, salt_in_len);
    salt[salt_in_len] = '\0';
 
    if ((result = php_crypt(str, (int)str_len, salt, (int)salt_in_len, 0)) == NULL) {
        if (salt[0] == '*' && salt[1] == '0') {
            RETURN_STRING("*1");
        } else {
            RETURN_STRING("*0");
        }
    }
    RETURN_STR(result);
}
/* }}} */