fix(security,agents): harden SSRF DNS-rebind, fail loudly, cover untested modules

src/gaia/agents/base/agent.py

@@ -435,8 +435,14 @@ def _get_mixin_prompts(self) -> list[str]:
                     fragment = getattr(self, attr_name)()
                     if fragment:
                         prompts.append(fragment)
-                except Exception:
-                    pass
+                except Exception as e:
+                    # A raising fragment is dropped from the composed prompt; surface it
+                    # so a silently degraded system prompt is diagnosable.
+                    logger.warning(
+                        "system-prompt fragment %s() raised, skipping it: %s",
+                        attr_name,
+                        e,
+                    )
 
         return prompts
 

src/gaia/agents/base/memory.py

@@ -62,8 +62,10 @@ def _load_memory_settings() -> Dict:
     try:
         if _MEMORY_SETTINGS_PATH.exists():
             return json.loads(_MEMORY_SETTINGS_PATH.read_text(encoding="utf-8"))
-    except Exception:
-        pass
+    except (OSError, json.JSONDecodeError) as e:
+        logger.warning(
+            "failed to load memory settings from %s: %s", _MEMORY_SETTINGS_PATH, e
+        )
     return {}
 
 

src/gaia/mcp/mcp_bridge.py

@@ -60,8 +60,8 @@ def _parse_cd(self, value: str):
                     name = p.split("=", 1)[1].strip().strip('"')
                 elif pl.startswith("filename="):
                     filename = p.split("=", 1)[1].strip().strip('"')
-        except Exception:
-            pass
+        except (AttributeError, IndexError, ValueError) as e:
+            logger.debug("Failed to parse Content-Disposition %r: %s", value, e)
         return name, filename
 
     def on_part_begin(self):

src/gaia/messaging/telegram.py

@@ -184,7 +184,12 @@ def start(self, token: str, background: bool = False) -> None:
                 with open(pid_path, "w", encoding="utf-8") as f:
                     f.write(str(os.getpid()))
             except OSError as e:
-                log.exception("Failed to write PID file for telegram adapter: %s", e)
+                # The PID file is load-bearing in background mode: without it a
+                # supervisor cannot find or kill the process. Fail loudly.
+                raise RuntimeError(
+                    f"Failed to write telegram PID file at {pid_path}: {e}. "
+                    f"Ensure ~/.gaia is writable, or start without --background."
+                ) from e
 
             log_path = os.path.join(pid_dir, "telegram.log")
             try:

src/gaia/rag/sdk.py

@@ -449,8 +449,8 @@ def _load_embedder(self):
             # Force fresh load - must unload first
             try:
                 self.llm_client.unload_model()
-            except Exception:
-                pass  # Ignore if nothing to unload
+            except Exception as e:
+                self.log.warning("unload_model failed (continuing): %s", e)
 
             try:
                 self.llm_client.load_model(

src/gaia/web/client.py

@@ -40,6 +40,42 @@
 ALLOWED_SCHEMES = {"http", "https"}
 BLOCKED_PORTS = {22, 23, 25, 445, 3306, 5432, 6379, 27017}
 
+
+def _is_blocked_ip(ip: "ipaddress._BaseAddress") -> bool:
+    """Return True if ``ip`` points at a private/internal range we must not fetch."""
+    return (
+        ip.is_private
+        or ip.is_loopback
+        or ip.is_link_local
+        or ip.is_reserved
+        or ip.is_multicast
+    )
+
+
+def _assert_ip_allowed(ip_str: str, hostname: str) -> None:
+    """Raise ValueError if ``ip_str`` is a private/reserved address.
+
+    The single authority for "is this IP safe to connect to". Both
+    ``WebClient.validate_url`` (pre-flight DNS check) and
+    ``PinnedIPAdapter`` (the IP it actually connects to) route through this,
+    so a DNS rebind that slips a private IP past the pre-flight lookup is
+    still caught at connect time on the *exact* address being dialed.
+    """
+    try:
+        ip = ipaddress.ip_address(ip_str)
+    except ValueError:
+        # Not parseable as an IP — treat as unsafe rather than letting an
+        # unvalidated value reach the socket layer (fail loudly).
+        raise ValueError(
+            f"Blocked: {hostname} resolved to unparseable address {ip_str!r}."
+        )
+    if _is_blocked_ip(ip):
+        raise ValueError(
+            f"Blocked: {hostname} resolves to private/reserved IP {ip}. "
+            "Cannot fetch internal network addresses."
+        )
+
+
 # Tags to remove during text extraction
 REMOVE_TAGS = [
     "script",
@@ -72,12 +108,35 @@ class PinnedIPAdapter(HTTPAdapter):
     DNS-rebind attacks between ``WebClient.validate_url`` and the actual
     TCP connect.
 
+    Crucially, the pinned IP is itself validated (``_assert_ip_allowed``)
+    before it is cached or connected to. ``validate_url`` runs a *separate*
+    pre-flight ``getaddrinfo``; an attacker controlling DNS could answer that
+    lookup with a public IP and answer the adapter's lookup with a private
+    one. Validating the exact address the adapter is about to dial closes
+    that residual rebind window for BOTH http and https.
+
     For HTTPS, the original hostname is encoded in the URL's userinfo
     section (``originalhostname@pinnedip:port``) so that urllib3 creates
     separate connection-pool keys per original hostname.  This avoids a
     race where two threads requesting different hostnames that resolve to
     the same IP would overwrite each other's ``assert_hostname`` on a
     shared pool.
+
+    Residual HTTPS limitation (documented, not silently ignored):
+    Because ``requests`` derives the urllib3 pool host — and therefore the
+    TLS SNI ``server_hostname`` — from the request URL's hostname (which we
+    rewrote to the pinned IP), the ClientHello SNI is sent as the IP, not the
+    original hostname. ``assert_hostname`` still forces certificate-name
+    verification against the real hostname (so verification is NOT disabled
+    and we never trust a cert for the bare IP), but servers that rely on SNI
+    for virtual hosting (most CDNs / shared hosts) may return the wrong
+    certificate or reject the handshake, surfacing as a TLS error rather than
+    a silent downgrade. This affects whether legitimate HTTPS *succeeds* — it
+    does not weaken the SSRF block, which fires on the validated IP before any
+    bytes are sent. Fixing SNI cleanly requires a custom urllib3
+    ``PoolManager``/``HTTPSConnection`` that decouples ``server_hostname``
+    from the connect address; that is intentionally out of scope here in
+    favour of a correct, narrower guarantee.
     """
 
     def __init__(self, *args, **kwargs):
@@ -94,6 +153,12 @@ def _resolve_first_ip(self, host: str, port: int) -> str:
             raise OSError(f"getaddrinfo returned no addresses for {host}:{port}")
 
         ip = infos[0][4][0]  # sockaddr[0] of the first result
+        # Validate the EXACT IP we are about to pin & connect to. validate_url
+        # did a pre-flight getaddrinfo, but that was a separate lookup — a DNS
+        # rebind could hand validate_url a public IP and hand us a private one.
+        # Re-check here so the address actually dialed is always safe; cache
+        # only after it passes so a poisoned answer is never reused.
+        _assert_ip_allowed(ip, host)
         self._pinned_cache[key] = ip
         return ip
 
@@ -134,7 +199,22 @@ def send(self, request: requests.PreparedRequest, **kwargs) -> requests.Response
             pinned_ip = self._resolve_first_ip(host, port)
 
             if parsed.scheme == "https":
-                # Encode original hostname in userinfo for unique pool keys
+                # Encode original hostname in userinfo for unique pool keys.
+                # See class docstring: SNI is sent as the pinned IP, so
+                # SNI-vhosted servers may fail the handshake. Cert-name
+                # verification still binds to the real hostname.
+                if not getattr(self, "_warned_https_sni", False):
+                    log.warning(
+                        "PinnedIPAdapter: HTTPS request to %s is pinned to %s; "
+                        "TLS SNI will be sent as the IP. Servers using "
+                        "SNI-based virtual hosting may return the wrong "
+                        "certificate or reject the handshake. Certificate-name "
+                        "verification still validates against %s.",
+                        host,
+                        pinned_ip,
+                        host,
+                    )
+                    self._warned_https_sni = True
                 new_netloc = f"{host}@{pinned_ip}:{port}"
             else:
                 new_netloc = f"{pinned_ip}:{port}"
@@ -270,13 +350,7 @@ def _validate_host_ip(self, hostname: str) -> None:
             except ValueError:
                 continue
 
-            if (
-                ip.is_private
-                or ip.is_loopback
-                or ip.is_link_local
-                or ip.is_reserved
-                or ip.is_multicast
-            ):
+            if _is_blocked_ip(ip):
                 raise ValueError(
                     f"Blocked: {hostname} resolves to private/reserved IP {ip}. "
                     "Cannot fetch internal network addresses."

tests/test_api.py

@@ -54,6 +54,95 @@ def setup(self):
             pytest.skip(f"API dependencies not available: {IMPORT_ERROR}")
         self.client = TestClient(app)
 
+    # -------------------------------------------------------------------------
+    # Non-streaming happy path (mocked agent backend — no Lemonade required)
+    # -------------------------------------------------------------------------
+
+    def test_basic_completion_with_mocked_agent(self, mocker):
+        """Non-streaming POST returns a schema-valid OpenAI completion.
+
+        The agent/Lemonade backend is mocked: registry.get_agent yields a stub
+        whose process_query returns a canned result dict, so the handler's
+        non-streaming branch runs end-to-end without a live LLM server.
+        """
+        # Stub agent: NOT an ApiAgent, so the handler uses the len//4 token
+        # estimate path (deterministic, no tokenizer needed).
+        fake_agent = mocker.MagicMock()
+        fake_agent.process_query.return_value = {
+            "status": "success",
+            "result": "def hello():\n    return 'hello world'",
+        }
+
+        from gaia.api.openai_server import registry as server_registry
+
+        mocker.patch.object(server_registry, "get_agent", return_value=fake_agent)
+
+        payload = {
+            "model": "gaia-code",
+            "messages": [
+                {"role": "user", "content": "Write a hello world function in Python"}
+            ],
+            "stream": False,
+        }
+        response = self.client.post("/v1/chat/completions", json=payload)
+
+        assert response.status_code == 200, response.text
+        data = response.json()
+
+        # Top-level OpenAI-compatible structure.
+        assert data["object"] == "chat.completion"
+        assert data["id"].startswith("chatcmpl-")
+        assert isinstance(data["created"], int)
+        assert data["model"] == "gaia-code"
+
+        # The agent was invoked with the extracted user message.
+        fake_agent.process_query.assert_called_once()
+        call_args, _ = fake_agent.process_query.call_args
+        assert call_args[0] == "Write a hello world function in Python"
+
+        # Choices.
+        assert len(data["choices"]) == 1
+        choice = data["choices"][0]
+        assert choice["index"] == 0
+        assert choice["message"]["role"] == "assistant"
+        assert choice["message"]["content"] == (
+            "def hello():\n    return 'hello world'"
+        )
+        assert choice["finish_reason"] == "stop"
+
+        # Usage accounting.
+        usage = data["usage"]
+        assert usage["prompt_tokens"] > 0
+        assert usage["completion_tokens"] > 0
+        assert usage["total_tokens"] == (
+            usage["prompt_tokens"] + usage["completion_tokens"]
+        )
+
+    def test_completion_uses_last_user_message(self, mocker):
+        """The handler passes the LAST user message (not system/assistant) to the agent."""
+        fake_agent = mocker.MagicMock()
+        fake_agent.process_query.return_value = {"result": "ok"}
+
+        from gaia.api.openai_server import registry as server_registry
+
+        mocker.patch.object(server_registry, "get_agent", return_value=fake_agent)
+
+        payload = {
+            "model": "gaia-code",
+            "messages": [
+                {"role": "system", "content": "You are helpful"},
+                {"role": "user", "content": "first question"},
+                {"role": "assistant", "content": "an earlier answer"},
+                {"role": "user", "content": "second question"},
+            ],
+            "stream": False,
+        }
+        response = self.client.post("/v1/chat/completions", json=payload)
+
+        assert response.status_code == 200, response.text
+        call_args, _ = fake_agent.process_query.call_args
+        assert call_args[0] == "second question"
+
     # -------------------------------------------------------------------------
     # Model Validation Tests
     # -------------------------------------------------------------------------
@@ -308,47 +397,6 @@ def test_422_error_has_detail_field(self):
 class TestChatCompletionsNonStreaming:
     """Test POST /v1/chat/completions without streaming"""
 
-    @pytest.mark.skip(reason="Skipped: API server returns 500 - see issue for fix")
-    def test_basic_completion_with_code_agent(self, api_server, api_client):
-        """Test that gaia-code returns valid OpenAI-compatible completion"""
-        payload = {
-            "model": "gaia-code",
-            "messages": [
-                {"role": "user", "content": "Write a hello world function in Python"}
-            ],
-            "stream": False,
-        }
-        response = api_client.post(f"{api_server}/v1/chat/completions", json=payload)
-
-        assert response.status_code == 200
-        data = response.json()
-
-        # Verify OpenAI-compatible structure
-        assert data["object"] == "chat.completion"
-        assert "id" in data
-        assert data["id"].startswith("chatcmpl-")
-        assert "created" in data
-        assert isinstance(data["created"], int)
-        assert data["model"] == "gaia-code"
-
-        # Verify choices
-        assert "choices" in data
-        assert len(data["choices"]) == 1
-        choice = data["choices"][0]
-        assert choice["index"] == 0
-        assert choice["message"]["role"] == "assistant"
-        assert isinstance(choice["message"]["content"], str)
-        assert len(choice["message"]["content"]) > 0
-        assert choice["finish_reason"] in ["stop", "length"]
-
-        # Verify token usage
-        assert "usage" in data
-        assert data["usage"]["prompt_tokens"] > 0
-        assert data["usage"]["completion_tokens"] > 0
-        assert data["usage"]["total_tokens"] == (
-            data["usage"]["prompt_tokens"] + data["usage"]["completion_tokens"]
-        )
-
     def test_invalid_model_returns_404(self, api_server, api_client):
         """Test that invalid model returns 404 error"""
         payload = {