Fix #78269 password_hash uses weak options for argon2

Author: remicollet

NEWS

@@ -45,6 +45,7 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug #78241 (touch() does not handle dates after 2038 in PHP 64-bit).
     (cmb)
+  . Fixed bug #78269 (password_hash uses weak options for argon2). (Remi)
 
 27 Jun 2019, PHP 7.2.20
 

ext/standard/php_password.h

@@ -33,9 +33,9 @@ PHP_MINIT_FUNCTION(password);
 #define PHP_PASSWORD_BCRYPT_COST 10
 
 #if HAVE_ARGON2LIB
-#define PHP_PASSWORD_ARGON2_MEMORY_COST 1<<10
-#define PHP_PASSWORD_ARGON2_TIME_COST 2
-#define PHP_PASSWORD_ARGON2_THREADS 2
+#define PHP_PASSWORD_ARGON2_MEMORY_COST (64 << 10)
+#define PHP_PASSWORD_ARGON2_TIME_COST 4
+#define PHP_PASSWORD_ARGON2_THREADS 1
 #endif
 
 typedef enum {

ext/standard/tests/password/password_needs_rehash_argon2.phpt

@@ -9,14 +9,12 @@ if (!defined('PASSWORD_ARGON2I')) die('skip password_needs_rehash not built with
 
 $hash = password_hash('test', PASSWORD_ARGON2I);
 var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I));
-var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I, ['memory_cost' => 1<<17]));
-var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I, ['time_cost' => 4]));
-var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I, ['threads' => 4]));
+var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I, ['memory_cost' => PASSWORD_ARGON2_DEFAULT_MEMORY_COST * 2]));
+var_dump(password_needs_rehash($hash, PASSWORD_ARGON2I, ['time_cost' => PASSWORD_ARGON2_DEFAULT_TIME_COST +1]));
 echo "OK!";
 ?>
 --EXPECT--
 bool(false)
 bool(true)
 bool(true)
-bool(true)
 OK!