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456 lines
12 KiB
C
456 lines
12 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2014 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Anthony Ferrara <ircmaxell@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include <stdlib.h>
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#include "php.h"
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#if HAVE_CRYPT
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#include "fcntl.h"
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#include "php_password.h"
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#include "php_rand.h"
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#include "php_crypt.h"
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#include "base64.h"
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#include "zend_interfaces.h"
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#include "info.h"
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#if PHP_WIN32
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#include "win32/winutil.h"
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#endif
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PHP_MINIT_FUNCTION(password) /* {{{ */
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{
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REGISTER_LONG_CONSTANT("PASSWORD_DEFAULT", PHP_PASSWORD_DEFAULT, CONST_CS | CONST_PERSISTENT);
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REGISTER_LONG_CONSTANT("PASSWORD_BCRYPT", PHP_PASSWORD_BCRYPT, CONST_CS | CONST_PERSISTENT);
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REGISTER_LONG_CONSTANT("PASSWORD_BCRYPT_DEFAULT_COST", PHP_PASSWORD_BCRYPT_COST, CONST_CS | CONST_PERSISTENT);
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return SUCCESS;
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}
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/* }}} */
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static char* php_password_get_algo_name(const php_password_algo algo)
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{
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switch (algo) {
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case PHP_PASSWORD_BCRYPT:
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return "bcrypt";
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case PHP_PASSWORD_UNKNOWN:
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default:
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return "unknown";
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}
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}
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static php_password_algo php_password_determine_algo(const char *hash, const size_t len)
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{
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if (len > 3 && hash[0] == '$' && hash[1] == '2' && hash[2] == 'y' && len == 60) {
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return PHP_PASSWORD_BCRYPT;
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}
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return PHP_PASSWORD_UNKNOWN;
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}
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static int php_password_salt_is_alphabet(const char *str, const size_t len) /* {{{ */
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{
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size_t i = 0;
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for (i = 0; i < len; i++) {
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if (!((str[i] >= 'A' && str[i] <= 'Z') || (str[i] >= 'a' && str[i] <= 'z') || (str[i] >= '0' && str[i] <= '9') || str[i] == '.' || str[i] == '/')) {
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return FAILURE;
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}
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}
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return SUCCESS;
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}
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/* }}} */
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static int php_password_salt_to64(const char *str, const size_t str_len, const size_t out_len, char *ret) /* {{{ */
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{
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size_t pos = 0;
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zend_string *buffer;
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if ((int) str_len < 0) {
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return FAILURE;
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}
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buffer = php_base64_encode((unsigned char*) str, str_len);
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if (buffer->len < out_len) {
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/* Too short of an encoded string generated */
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zend_string_release(buffer);
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return FAILURE;
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}
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for (pos = 0; pos < out_len; pos++) {
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if (buffer->val[pos] == '+') {
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ret[pos] = '.';
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} else if (buffer->val[pos] == '=') {
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zend_string_free(buffer);
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return FAILURE;
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} else {
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ret[pos] = buffer->val[pos];
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}
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}
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zend_string_free(buffer);
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return SUCCESS;
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}
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/* }}} */
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static int php_password_make_salt(size_t length, char *ret) /* {{{ */
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{
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int buffer_valid = 0;
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size_t i, raw_length;
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char *buffer;
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char *result;
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if (length > (INT_MAX / 3)) {
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php_error_docref(NULL, E_WARNING, "Length is too large to safely generate");
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return FAILURE;
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}
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raw_length = length * 3 / 4 + 1;
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buffer = (char *) safe_emalloc(raw_length, 1, 1);
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#if PHP_WIN32
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{
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BYTE *iv_b = (BYTE *) buffer;
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if (php_win32_get_random_bytes(iv_b, raw_length) == SUCCESS) {
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buffer_valid = 1;
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}
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}
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#else
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{
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int fd, n;
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size_t read_bytes = 0;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd >= 0) {
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while (read_bytes < raw_length) {
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n = read(fd, buffer + read_bytes, raw_length - read_bytes);
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if (n < 0) {
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break;
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}
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read_bytes += (size_t) n;
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}
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close(fd);
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}
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if (read_bytes >= raw_length) {
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buffer_valid = 1;
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}
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}
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#endif
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if (!buffer_valid) {
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for (i = 0; i < raw_length; i++) {
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buffer[i] ^= (char) (255.0 * php_rand() / RAND_MAX);
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}
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}
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result = safe_emalloc(length, 1, 1);
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if (php_password_salt_to64(buffer, raw_length, length, result) == FAILURE) {
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php_error_docref(NULL, E_WARNING, "Generated salt too short");
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efree(buffer);
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efree(result);
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return FAILURE;
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}
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memcpy(ret, result, length);
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efree(result);
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efree(buffer);
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ret[length] = 0;
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return SUCCESS;
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}
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/* }}} */
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PHP_FUNCTION(password_get_info)
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{
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php_password_algo algo;
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size_t hash_len;
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char *hash, *algo_name;
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zval options;
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if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &hash, &hash_len) == FAILURE) {
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return;
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}
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array_init(&options);
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algo = php_password_determine_algo(hash, (size_t) hash_len);
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algo_name = php_password_get_algo_name(algo);
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switch (algo) {
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case PHP_PASSWORD_BCRYPT:
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{
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zend_long cost = PHP_PASSWORD_BCRYPT_COST;
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sscanf(hash, "$2y$" ZEND_LONG_FMT "$", &cost);
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add_assoc_long(&options, "cost", cost);
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}
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break;
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case PHP_PASSWORD_UNKNOWN:
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default:
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break;
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}
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array_init(return_value);
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add_assoc_long(return_value, "algo", algo);
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add_assoc_string(return_value, "algoName", algo_name);
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add_assoc_zval(return_value, "options", &options);
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}
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PHP_FUNCTION(password_needs_rehash)
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{
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zend_long new_algo = 0;
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php_password_algo algo;
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size_t hash_len;
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char *hash;
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HashTable *options = 0;
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zval *option_buffer;
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if (zend_parse_parameters(ZEND_NUM_ARGS(), "sl|H", &hash, &hash_len, &new_algo, &options) == FAILURE) {
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return;
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}
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algo = php_password_determine_algo(hash, (size_t) hash_len);
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if (algo != new_algo) {
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RETURN_TRUE;
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}
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switch (algo) {
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case PHP_PASSWORD_BCRYPT:
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{
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zend_long new_cost = PHP_PASSWORD_BCRYPT_COST, cost = 0;
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if (options && (option_buffer = zend_symtable_str_find(options, "cost", sizeof("cost")-1)) != NULL) {
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if (Z_TYPE_P(option_buffer) != IS_LONG) {
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zval cast_option_buffer;
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ZVAL_DUP(&cast_option_buffer, option_buffer);
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convert_to_long(&cast_option_buffer);
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new_cost = Z_LVAL(cast_option_buffer);
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zval_dtor(&cast_option_buffer);
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} else {
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new_cost = Z_LVAL_P(option_buffer);
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}
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}
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sscanf(hash, "$2y$" ZEND_LONG_FMT "$", &cost);
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if (cost != new_cost) {
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RETURN_TRUE;
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}
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}
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break;
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case PHP_PASSWORD_UNKNOWN:
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default:
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break;
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}
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RETURN_FALSE;
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}
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/* {{{ proto boolean password_make_salt(string password, string hash)
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Verify a hash created using crypt() or password_hash() */
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PHP_FUNCTION(password_verify)
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{
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int status = 0, i;
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size_t password_len, hash_len;
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char *password, *hash;
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zend_string *ret;
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if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss", &password, &password_len, &hash, &hash_len) == FAILURE) {
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RETURN_FALSE;
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}
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if ((ret = php_crypt(password, (int)password_len, hash, (int)hash_len)) == NULL) {
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RETURN_FALSE;
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}
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if (ret->len != hash_len || hash_len < 13) {
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zend_string_free(ret);
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RETURN_FALSE;
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}
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/* We're using this method instead of == in order to provide
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* resistance towards timing attacks. This is a constant time
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* equality check that will always check every byte of both
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* values. */
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for (i = 0; i < hash_len; i++) {
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status |= (ret->val[i] ^ hash[i]);
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}
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zend_string_free(ret);
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RETURN_BOOL(status == 0);
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}
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/* }}} */
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/* {{{ proto string password_hash(string password, int algo, array options = array())
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Hash a password */
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PHP_FUNCTION(password_hash)
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{
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char *hash_format, *hash, *salt, *password;
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zend_long algo = 0;
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size_t password_len = 0;
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int hash_len;
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size_t salt_len = 0, required_salt_len = 0, hash_format_len;
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HashTable *options = 0;
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zval *option_buffer;
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zend_string *result;
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if (zend_parse_parameters(ZEND_NUM_ARGS(), "sl|H", &password, &password_len, &algo, &options) == FAILURE) {
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return;
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}
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switch (algo) {
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case PHP_PASSWORD_BCRYPT:
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{
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zend_long cost = PHP_PASSWORD_BCRYPT_COST;
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if (options && (option_buffer = zend_symtable_str_find(options, "cost", sizeof("cost")-1)) != NULL) {
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if (Z_TYPE_P(option_buffer) != IS_LONG) {
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zval cast_option_buffer;
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ZVAL_DUP(&cast_option_buffer, option_buffer);
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convert_to_long(&cast_option_buffer);
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cost = Z_LVAL(cast_option_buffer);
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zval_dtor(&cast_option_buffer);
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} else {
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cost = Z_LVAL_P(option_buffer);
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}
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}
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if (cost < 4 || cost > 31) {
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php_error_docref(NULL, E_WARNING, "Invalid bcrypt cost parameter specified: " ZEND_LONG_FMT, cost);
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RETURN_NULL();
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}
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required_salt_len = 22;
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hash_format = emalloc(8);
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sprintf(hash_format, "$2y$%02ld$", (long) cost);
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hash_format_len = 7;
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}
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break;
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case PHP_PASSWORD_UNKNOWN:
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default:
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php_error_docref(NULL, E_WARNING, "Unknown password hashing algorithm: " ZEND_LONG_FMT, algo);
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RETURN_NULL();
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}
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if (options && (option_buffer = zend_symtable_str_find(options, "salt", sizeof("salt")-1)) != NULL) {
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char *buffer;
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size_t buffer_len = 0;
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switch (Z_TYPE_P(option_buffer)) {
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case IS_STRING:
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buffer = estrndup(Z_STRVAL_P(option_buffer), Z_STRLEN_P(option_buffer));
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buffer_len = Z_STRLEN_P(option_buffer);
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break;
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case IS_LONG:
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case IS_DOUBLE:
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case IS_OBJECT: {
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zval cast_option_buffer;
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ZVAL_DUP(&cast_option_buffer, option_buffer);
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convert_to_string(&cast_option_buffer);
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if (Z_TYPE(cast_option_buffer) == IS_STRING) {
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buffer = estrndup(Z_STRVAL(cast_option_buffer), Z_STRLEN(cast_option_buffer));
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buffer_len = Z_STRLEN(cast_option_buffer);
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zval_dtor(&cast_option_buffer);
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break;
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}
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zval_dtor(&cast_option_buffer);
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}
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case IS_FALSE:
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case IS_TRUE:
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case IS_NULL:
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case IS_RESOURCE:
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case IS_ARRAY:
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default:
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efree(hash_format);
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php_error_docref(NULL, E_WARNING, "Non-string salt parameter supplied");
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RETURN_NULL();
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}
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/* XXX all the crypt related APIs work with int for string length.
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That should be revised for size_t and then we maybe don't require
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the > INT_MAX check. */
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if (buffer_len > INT_MAX) {
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efree(hash_format);
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efree(buffer);
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php_error_docref(NULL, E_WARNING, "Supplied salt is too long");
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RETURN_NULL();
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} else if (buffer_len < required_salt_len) {
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efree(hash_format);
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efree(buffer);
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php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd expecting %zd", buffer_len, required_salt_len);
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RETURN_NULL();
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} else if (php_password_salt_is_alphabet(buffer, buffer_len) == FAILURE) {
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salt = safe_emalloc(required_salt_len, 1, 1);
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if (php_password_salt_to64(buffer, buffer_len, required_salt_len, salt) == FAILURE) {
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efree(hash_format);
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efree(buffer);
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efree(salt);
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php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd", buffer_len);
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RETURN_NULL();
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}
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salt_len = required_salt_len;
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} else {
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salt = safe_emalloc(required_salt_len, 1, 1);
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memcpy(salt, buffer, required_salt_len);
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salt_len = required_salt_len;
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}
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efree(buffer);
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} else {
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salt = safe_emalloc(required_salt_len, 1, 1);
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if (php_password_make_salt(required_salt_len, salt) == FAILURE) {
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efree(hash_format);
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efree(salt);
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RETURN_FALSE;
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}
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salt_len = required_salt_len;
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}
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salt[salt_len] = 0;
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hash = safe_emalloc(salt_len + hash_format_len, 1, 1);
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sprintf(hash, "%s%s", hash_format, salt);
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hash[hash_format_len + salt_len] = 0;
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efree(hash_format);
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efree(salt);
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/* This cast is safe, since both values are defined here in code and cannot overflow */
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hash_len = (int) (hash_format_len + salt_len);
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if ((result = php_crypt(password, (int)password_len, hash, hash_len)) == NULL) {
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efree(hash);
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RETURN_FALSE;
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}
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efree(hash);
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if (result->len < 13) {
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zend_string_free(result);
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RETURN_FALSE;
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}
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RETURN_STR(result);
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}
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/* }}} */
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#endif /* HAVE_CRYPT */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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