Add ssha256 password algo (#8479)

plugins/password/config.inc.php.dist

@@ -44,7 +44,7 @@ $config['password_force_new_user'] = false;
 
 // Password hashing/crypting algorithm.
 // Possible options: des-crypt, ext-des-crypt, md5-crypt, blowfish-crypt,
-// sha256-crypt, sha512-crypt, md5, sha, smd5, ssha, ssha512, samba, ad, dovecot, clear.
+// sha256-crypt, sha512-crypt, md5, sha, smd5, ssha, ssha256, ssha512, samba, ad, dovecot, clear.
 // Also supported are password_hash() algoriths: hash-bcrypt, hash-argon2i, hash-argon2id.
 // Default: 'clear' (no hashing)
 // For details see password::hash_password() method.

plugins/password/password.php

@@ -636,6 +636,26 @@ class password extends rcube_plugin
             $prefix  = '{SSHA}';
             break;
 
+        // base64 encoded ssha256 for mailcow
+        case 'ssha256':
+            $salt = rcube_utils::random_bytes(8);
+
+            if (function_exists('hash')) {
+                $salt    = substr(pack("H*", hash('sha256', $salt . $password)), 0, 4);
+                $crypted = hash('sha256', $password . $salt, true);
+            }
+            else {
+                rcube::raise_error([
+                        'code' => 600, 'file' => __FILE__, 'line' => __LINE__,
+                        'message' => "Password plugin: Your PHP installation does not have the hash() function"
+                   ], true, true
+               );
+            }
+
+            $crypted = base64_encode($crypted . $salt);
+            $prefix  = '{SSHA256}';
+            break;
+
         case 'ssha512':
             $salt = rcube_utils::random_bytes(8);
 

plugins/password/tests/Password.php

@@ -102,6 +102,9 @@ class Password_Plugin extends PHPUnit\Framework\TestCase
         $pass = password::hash_password('test', 'ssha');
         $this->assertMatchesRegularExpression('/^\{SSHA\}[a-zA-Z0-9+\/]{32}$/', $pass);
 
+        $pass = password::hash_password('test', 'ssha256');
+        $this->assertMatchesRegularExpression('/^\{SSHA256\}[a-zA-Z0-9+\/=]{48}$/', $pass);
+
         $pass = password::hash_password('test', 'sha256-crypt');
         $this->assertMatchesRegularExpression('/^\{SHA256-CRYPT\}\$5\$[a-zA-Z0-9]{16}\$[a-zA-Z0-9.\/]{43}$/', $pass);