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php-src/ext/standard/crypt.c
Sammy Kaye Powers 478f119ab9 Update copyright headers to 2017
2017-01-04 11:14:55 -06:00

347 lines
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2017 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: |
| http://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@zend.com> |
| Rasmus Lerdorf <rasmus@php.net> |
| Pierre Joye <pierre@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <stdlib.h>
#include "php.h"
#if HAVE_CRYPT
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if PHP_USE_PHP_CRYPT_R
# include "php_crypt_r.h"
# include "crypt_freesec.h"
#else
# if HAVE_CRYPT_H
# if defined(CRYPT_R_GNU_SOURCE) && !defined(_GNU_SOURCE)
# define _GNU_SOURCE
# endif
# include <crypt.h>
# endif
#endif
#if TM_IN_SYS_TIME
#include <sys/time.h>
#else
#include <time.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#ifdef PHP_WIN32
#include <process.h>
#endif
#include "php_lcg.h"
#include "php_crypt.h"
#include "php_rand.h"
/* The capabilities of the crypt() function is determined by the test programs
* run by configure from aclocal.m4. They will set PHP_STD_DES_CRYPT,
* PHP_EXT_DES_CRYPT, PHP_MD5_CRYPT and PHP_BLOWFISH_CRYPT as appropriate
* for the target platform. */
#if PHP_STD_DES_CRYPT
#define PHP_MAX_SALT_LEN 2
#endif
#if PHP_EXT_DES_CRYPT
#undef PHP_MAX_SALT_LEN
#define PHP_MAX_SALT_LEN 9
#endif
#if PHP_MD5_CRYPT
#undef PHP_MAX_SALT_LEN
#define PHP_MAX_SALT_LEN 12
#endif
#if PHP_BLOWFISH_CRYPT
#undef PHP_MAX_SALT_LEN
#define PHP_MAX_SALT_LEN 60
#endif
#if PHP_SHA512_CRYPT
#undef PHP_MAX_SALT_LEN
#define PHP_MAX_SALT_LEN 123
#endif
/* If the configure-time checks fail, we provide DES.
* XXX: This is a hack. Fix the real problem! */
#ifndef PHP_MAX_SALT_LEN
#define PHP_MAX_SALT_LEN 2
#undef PHP_STD_DES_CRYPT
#define PHP_STD_DES_CRYPT 1
#endif
#define PHP_CRYPT_RAND php_rand()
/* 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'))
#define DES_INVALID_SALT_ERROR "Supplied salt is not valid for DES. Possible bug in provided salt format."
PHP_MINIT_FUNCTION(crypt) /* {{{ */
{
REGISTER_LONG_CONSTANT("CRYPT_SALT_LENGTH", PHP_MAX_SALT_LEN, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("CRYPT_STD_DES", PHP_STD_DES_CRYPT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("CRYPT_EXT_DES", PHP_EXT_DES_CRYPT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("CRYPT_MD5", PHP_MD5_CRYPT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("CRYPT_BLOWFISH", PHP_BLOWFISH_CRYPT, CONST_CS | CONST_PERSISTENT);
#ifdef PHP_SHA256_CRYPT
REGISTER_LONG_CONSTANT("CRYPT_SHA256", PHP_SHA256_CRYPT, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef PHP_SHA512_CRYPT
REGISTER_LONG_CONSTANT("CRYPT_SHA512", PHP_SHA512_CRYPT, CONST_CS | CONST_PERSISTENT);
#endif
#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;
}
/* }}} */
static unsigned char itoa64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static void php_to64(char *s, zend_long v, int n) /* {{{ */
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
/* }}} */
PHPAPI zend_string *php_crypt(const char *password, const int pass_len, const char *salt, int salt_len, zend_bool quiet)
{
char *crypt_res;
zend_string *result;
/* 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) {
memset(output, 0, PHP_MAX_SALT_LEN);
efree(output);
return NULL;
} else {
result = zend_string_init(output, strlen(output), 0);
memset(output, 0, 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) {
memset(output, 0, PHP_MAX_SALT_LEN);
efree(output);
return NULL;
} else {
result = zend_string_init(output, strlen(output), 0);
memset(output, 0, PHP_MAX_SALT_LEN);
efree(output);
return result;
}
} else if (
salt[0] == '$' &&
salt[1] == '2' &&
salt[3] == '$') {
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] == '*' && (salt[1] == '0' || salt[1] == '1')) {
return NULL;
} else {
/* DES Fallback */
/* Only check the salt if it's not EXT_DES */
if (salt[0] != '_') {
/* DES style hashes */
if (!IS_VALID_SALT_CHARACTER(salt[0]) || !IS_VALID_SALT_CHARACTER(salt[1])) {
if (!quiet) {
/* error consistently about invalid DES fallbacks */
php_error_docref(NULL, E_DEPRECATED, DES_INVALID_SALT_ERROR);
}
}
}
memset(&buffer, 0, sizeof(buffer));
_crypt_extended_init_r();
crypt_res = _crypt_extended_r(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
if (salt[0] != '$' && salt[0] != '_' && (!IS_VALID_SALT_CHARACTER(salt[0]) || !IS_VALID_SALT_CHARACTER(salt[1]))) {
if (!quiet) {
/* error consistently about invalid DES fallbacks */
php_error_docref(NULL, E_DEPRECATED, DES_INVALID_SALT_ERROR);
}
}
# if defined(HAVE_CRYPT_R) && (defined(_REENTRANT) || defined(_THREAD_SAFE))
{
# if defined(CRYPT_R_STRUCT_CRYPT_DATA)
struct crypt_data buffer;
memset(&buffer, 0, sizeof(buffer));
# elif defined(CRYPT_R_CRYPTD)
CRYPTD buffer;
# else
# error Data struct used by crypt_r() is unknown. Please report.
# endif
crypt_res = crypt_r(password, salt, &buffer);
}
# elif defined(HAVE_CRYPT)
crypt_res = crypt(password, salt);
# else
# error No crypt() implementation
# endif
#endif
if (!crypt_res || (salt[0] == '*' && salt[1] == '0')) {
return NULL;
} else {
result = zend_string_init(crypt_res, strlen(crypt_res), 0);
return result;
}
}
/* }}} */
/* {{{ proto string crypt(string str [, string salt])
Hash a string */
PHP_FUNCTION(crypt)
{
char salt[PHP_MAX_SALT_LEN + 1];
char *str, *salt_in = NULL;
size_t str_len, salt_in_len = 0;
zend_string *result;
salt[0] = salt[PHP_MAX_SALT_LEN] = '\0';
/* This will produce suitable results if people depend on DES-encryption
* available (passing always 2-character salt). At least for glibc6.1 */
memset(&salt[1], '$', PHP_MAX_SALT_LEN - 1);
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|s", &str, &str_len, &salt_in, &salt_in_len) == FAILURE) {
return;
}
if (salt_in) {
memcpy(salt, salt_in, MIN(PHP_MAX_SALT_LEN, salt_in_len));
} else {
php_error_docref(NULL, E_NOTICE, "No salt parameter was specified. You must use a randomly generated salt and a strong hash function to produce a secure hash.");
}
/* The automatic salt generation covers standard DES, md5-crypt and Blowfish (simple) */
if (!*salt) {
#if PHP_MD5_CRYPT
strncpy(salt, "$1$", PHP_MAX_SALT_LEN);
php_to64(&salt[3], PHP_CRYPT_RAND, 4);
php_to64(&salt[7], PHP_CRYPT_RAND, 4);
strncpy(&salt[11], "$", PHP_MAX_SALT_LEN - 11);
#elif PHP_STD_DES_CRYPT
php_to64(&salt[0], PHP_CRYPT_RAND, 2);
salt[2] = '\0';
#endif
salt_in_len = strlen(salt);
} else {
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);
}
/* }}} */
#endif
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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