fix(get_config): use paramiko directly with group1-sha1 for Mocana SSH 6.3

- Replace netmiko with direct paramiko connection for SSH config fallback
- Explicitly set preferred_kex to include diffie-hellman-group1-sha1
  (required by old Mocana SSH 6.3 on HP 2530 / YA firmware)
- Hard timeout caps: banner_timeout=auth_timeout=8s, no keys/agent

napalm_procurve/procurve.py

@@ -590,29 +590,57 @@ class ProcurveDriver(ConfigLifecycleMixin, SwitchDriver):
         """Open a one-shot SSH session to retrieve running-config.
 
         Used as fallback when the REST API does not expose the config endpoint
-        (e.g. HP 2530 / YA firmware).  Tries legacy KEX first (required for
-        older ProCurve firmware), then standard.  Each attempt is capped at
-        8 seconds so this fallback never pushes the overall poll over budget.
-        Returns empty string on any failure.
+        (e.g. HP 2530 / YA firmware with Mocana SSH).
+
+        Uses paramiko directly (not netmiko) to:
+        - Explicitly enable diffie-hellman-group1-sha1 (required by Mocana SSH 6.3)
+        - Keep total blocking time ≤ 10 seconds
         """
-        _FALLBACK_TIMEOUT = 8  # seconds per attempt — keeps total ≤ 16 s
-        for legacy in (True, False):
+        import paramiko
+
+        _FALLBACK_TIMEOUT = 8
+
+        # KEX list that includes the old group1-sha1 required by Mocana SSH 6.3
+        _LEGACY_KEX = [
+            "diffie-hellman-group1-sha1",
+            "diffie-hellman-group14-sha1",
+            "diffie-hellman-group14-sha256",
+            "diffie-hellman-group-exchange-sha256",
+        ]
+        _LEGACY_DISABLED = {
+            "pubkeys": ["rsa-sha2-256", "rsa-sha2-512"],
+        }
+
         try:
-                kwargs = self._netmiko_kwargs(legacy=legacy)
-                kwargs["timeout"] = _FALLBACK_TIMEOUT
-                conn = ConnectHandler(**kwargs)
+            client = paramiko.SSHClient()
+            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+
+            # Patch the preferred kex list on the class before connecting so
+            # paramiko will negotiate group1-sha1 with the old Mocana SSH server.
+            orig_kex = paramiko.Transport._preferred_kex
             try:
-                    return conn.send_command("show running-config")
-                finally:
-                    conn.disconnect()
-            except Exception as exc:
-                logger.debug(
-                    "SSH config fallback (%s) failed for %s: %s",
-                    "legacy" if legacy else "standard",
-                    self.hostname,
-                    exc,
+                paramiko.Transport._preferred_kex = tuple(_LEGACY_KEX)
+                client.connect(
+                    hostname=self.hostname,
+                    port=self.port or 22,
+                    username=self.username,
+                    password=self.password,
+                    timeout=_FALLBACK_TIMEOUT,
+                    banner_timeout=_FALLBACK_TIMEOUT,
+                    auth_timeout=_FALLBACK_TIMEOUT,
+                    look_for_keys=False,
+                    allow_agent=False,
+                    disabled_algorithms=_LEGACY_DISABLED,
                 )
-        logger.warning("SSH config fallback failed for %s (all transports)", self.hostname)
+            finally:
+                paramiko.Transport._preferred_kex = orig_kex
+
+            _, stdout, _ = client.exec_command("show running-config", timeout=_FALLBACK_TIMEOUT)
+            config = stdout.read().decode("utf-8", errors="replace")
+            client.close()
+            return config
+        except Exception as exc:
+            logger.warning("SSH config fallback failed for %s: %s", self.hostname, exc)
             return ""
 
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