{"record":{"id":"84e2adb2b3c386f2","repo":"sqlmapproject/sqlmap","slug":"unexpected-message-r-during-authentication","errorCode":null,"errorMessage":"unexpected message %r during authentication","messagePattern":"unexpected message %r during authentication","errorType":"exception","errorClass":"InterfaceError","httpStatus":null,"severity":"error","filePath":"extra/dbwire/postgres.py","lineNumber":235,"sourceCode":"                    self._txn_status = payload[:1] or b\"I\"\n                    break\n                # ParameterStatus(S)/NoticeResponse(N)/EmptyQueryResponse(I)/CopyData(d)/CopyDone(c)/... ignored\n            except (struct.error, IndexError, ValueError) as ex:\n                raise InterfaceError(\"malformed backend message: %s\" % ex)\n        if error is not None:\n            _raise_server_error(*error)\n        return description, rows, 0, rowcount\n\ndef _authenticate(sock, user, password):\n    client_nonce = cfirst_bare = salted = auth_message = None\n    while True:\n        mtype, payload = _read_message(sock)\n        if mtype in (b\"N\", b\"S\"):  # NoticeResponse / ParameterStatus may legally precede AuthenticationOk\n            continue\n        if mtype == b\"E\":\n            _raise_server_error_as_operational(payload)\n        if mtype != b\"R\":\n            raise InterfaceError(\"unexpected message %r during authentication\" % mtype)\n        (code,) = struct.unpack(\"!I\", payload[:4])\n        if code == 0:  # AuthenticationOk (also the trust case)\n            return\n        elif code == 3:  # cleartext password\n            _send(sock, b\"p\", (password or \"\").encode(\"utf-8\") + b\"\\x00\")\n        elif code == 5:  # MD5 password\n            salt = payload[4:8]\n            inner = hashlib.md5((password or \"\").encode(\"utf-8\") + (user or \"\").encode(\"utf-8\")).hexdigest()\n            token = b\"md5\" + hashlib.md5(inner.encode(\"ascii\") + salt).hexdigest().encode(\"ascii\")\n            _send(sock, b\"p\", token + b\"\\x00\")\n        elif code == 10:  # SASL (SCRAM-SHA-256)\n            if not hasattr(hashlib, \"pbkdf2_hmac\"):\n                raise NotSupportedError(\"SCRAM-SHA-256 authentication requires Python >= 2.7.8 (hashlib.pbkdf2_hmac)\")\n            client_nonce = base64.b64encode(os.urandom(18)).decode(\"ascii\")\n            cfirst_bare = \"n=,r=%s\" % client_nonce\n            client_first = \"n,,\" + cfirst_bare\n            _send(sock, b\"p\", b\"SCRAM-SHA-256\\x00\" + struct.pack(\"!I\", len(client_first)) + client_first.encode(\"ascii\"))\n        elif code == 11:  # SASLContinue (server-first)","sourceCodeStart":217,"sourceCodeEnd":253,"githubUrl":"https://github.com/sqlmapproject/sqlmap/blob/0a35b20e3953d341be6c7ac75ccb0b3362540c8d/extra/dbwire/postgres.py#L217-L253","documentation":"Error \"unexpected message %r during authentication\" thrown in sqlmapproject/sqlmap.","triggerScenarios":"Thrown at extra/dbwire/postgres.py:235 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0a35b20e3953d341be6c7ac75ccb0b3362540c8d","analyzedAt":"2026-08-26T23:02:52.002Z","schemaVersion":2},"datasetVersion":"2026-08-27T03:17:27.898Z"}