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Moved buffer from heap to stack

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This commit is contained in:
Julien Pauli 2016-01-04 14:46:57 +01:00
parent 1e1c5c427e
commit ef4dc15831
1 changed files with 14 additions and 29 deletions
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43
ext/standard/password.c
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@ -261,7 +261,7 @@ PHP_FUNCTION(password_verify)
Hash a password */
PHP_FUNCTION(password_hash)
{
char *hash_format, *hash, *salt, *password;
char hash_format[8], *hash, *salt, *password;
zend_long algo = 0;
size_t password_len = 0;
int hash_len;
@ -289,7 +289,6 @@ PHP_FUNCTION(password_hash)
}
required_salt_len = 22;
hash_format = emalloc(8);
sprintf(hash_format, "$2y$%02ld$", (long) cost);
hash_format_len = 7;
}
@ -301,33 +300,25 @@ PHP_FUNCTION(password_hash)
}
if (options && (option_buffer = zend_hash_str_find(options, "salt", sizeof("salt")-1)) != NULL) {
char *buffer;
size_t buffer_len = 0;
zend_string *buffer;
php_error_docref(NULL, E_DEPRECATED, "Use of the 'salt' option to password_hash is deprecated");
switch (Z_TYPE_P(option_buffer)) {
case IS_STRING:
buffer = estrndup(Z_STRVAL_P(option_buffer), Z_STRLEN_P(option_buffer));
buffer_len = Z_STRLEN_P(option_buffer);
buffer = zend_string_copy(Z_STR_P(option_buffer));
break;
case IS_LONG:
case IS_DOUBLE:
case IS_OBJECT:
{
zend_string *tmp = zval_get_string(option_buffer);
buffer = estrndup(ZSTR_VAL(tmp), ZSTR_LEN(tmp));
buffer_len = ZSTR_LEN(tmp);
zend_string_release(tmp);
buffer = zval_get_string(option_buffer);
break;
}
case IS_FALSE:
case IS_TRUE:
case IS_NULL:
case IS_RESOURCE:
case IS_ARRAY:
default:
efree(hash_format);
php_error_docref(NULL, E_WARNING, "Non-string salt parameter supplied");
RETURN_NULL();
}
@ -335,36 +326,31 @@ PHP_FUNCTION(password_hash)
/* XXX all the crypt related APIs work with int for string length.
That should be revised for size_t and then we maybe don't require
the > INT_MAX check. */
if (buffer_len > INT_MAX) {
efree(hash_format);
efree(buffer);
if (ZSTR_LEN(buffer) > INT_MAX) {
php_error_docref(NULL, E_WARNING, "Supplied salt is too long");
RETURN_NULL();
} else if (buffer_len < required_salt_len) {
efree(hash_format);
efree(buffer);
php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd expecting %zd", buffer_len, required_salt_len);
} else if (ZSTR_LEN(buffer) < required_salt_len) {
php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd expecting %zd", ZSTR_LEN(buffer), required_salt_len);
zend_string_release(buffer);
RETURN_NULL();
} else if (php_password_salt_is_alphabet(buffer, buffer_len) == FAILURE) {
} else if (php_password_salt_is_alphabet(ZSTR_VAL(buffer), ZSTR_LEN(buffer)) == FAILURE) {
salt = safe_emalloc(required_salt_len, 1, 1);
if (php_password_salt_to64(buffer, buffer_len, required_salt_len, salt) == FAILURE) {
efree(hash_format);
efree(buffer);
if (php_password_salt_to64(ZSTR_VAL(buffer), ZSTR_LEN(buffer), required_salt_len, salt) == FAILURE) {
efree(salt);
php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd", buffer_len);
php_error_docref(NULL, E_WARNING, "Provided salt is too short: %zd", ZSTR_LEN(buffer));
zend_string_release(buffer);
RETURN_NULL();
}
salt_len = required_salt_len;
} else {
salt = safe_emalloc(required_salt_len, 1, 1);
memcpy(salt, buffer, required_salt_len);
memcpy(salt, ZSTR_VAL(buffer), required_salt_len);
salt_len = required_salt_len;
}
efree(buffer);
zend_string_release(buffer);
} else {
salt = safe_emalloc(required_salt_len, 1, 1);
if (php_password_make_salt(required_salt_len, salt) == FAILURE) {
efree(hash_format);
efree(salt);
RETURN_FALSE;
}
@ -377,7 +363,6 @@ PHP_FUNCTION(password_hash)
sprintf(hash, "%s%s", hash_format, salt);
hash[hash_format_len + salt_len] = 0;
efree(hash_format);
efree(salt);
/* This cast is safe, since both values are defined here in code and cannot overflow */