fix(connectors): MCP single-writer enforcement + security hardening (#976)#998
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fix(connectors): MCP single-writer enforcement + security hardening (#976)#998
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…976) Closes #976. Part of #927. Before this change, three code paths independently wrote `~/.gaia/mcp_servers.json`, two of them bypassing the keyring and storing API keys as plaintext. A compromised MCP server entry could also exfiltrate arbitrary keyring secrets at spawn time, disconnecting a connector left prior agent grants intact for re-use, and LLM output in the Electron renderer could inject `<script>` tags via `rehype-raw`. Changes: - Delete `MCPConfig.add_server`, `remove_server`, `_save` — config.py is now read-only; `McpServerHandler.configure()` is the sole writer of mcp_servers.json - Delete `POST /api/mcp/servers`, `DELETE /api/mcp/servers/{name}`, enable/disable, and `GET /api/mcp/catalog` from mcp.py; delete corresponding dead stubs from api.ts - Remove `gaia mcp add` and `gaia mcp remove` CLI subcommands (runtime commands kept) - Pin `_resolve_keyring_refs` to service `gaia.connections`; raise `ConnectorsError` (not `RuntimeError`) on foreign service or missing entry, with an actionable message - Wipe all agent grants (`revoke_all_grants_for`) in both `McpServerHandler.disconnect` and `OAuthPkceHandler.disconnect` — prevents silent grant inheritance on reconnect - Harden file permissions: `chmod 0600` on `mcp_servers.json` and `grants.json` after every atomic write - Reduce MCP catalog from 22 to 5 tested entries (mcp-github, mcp-filesystem, mcp-fetch, mcp-memory, mcp-git); delete 17 untested entries that had zero test/doc coverage - Replace `rehype-raw` with hardened `SAFE_DISALLOWED_ELEMENTS` + `safeUrlTransform` in MessageBubble; new `src/utils/markdown.ts` centralises the safe rendering policy Tests: 3 new test files (22 tests) — catalog ledger, dual-writer regression guard, disconnect-clears-grants; keyring tests extended with foreign-service refusal case. 305 connectors tests pass (1 pre-existing failure in test_oauth_pkce unrelated to this PR).
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Closes #1004. Part of #927. Builds on #976 (PR #998). Users can now temporarily disable a configured MCP connector without losing its credentials or per-agent grants. Toggle off the GitHub MCP during a sensitive code review, toggle back on without re-pasting the PAT — credentials and agent consent persist across the round-trip. Persistence already worked: ``mcp_servers.json`` carries a per-entry ``disabled`` flag and ``MCPClientManager.load_from_config()`` already skips disabled entries. This PR adds the API/UI/wiring to drive it. Backend: - ``McpServerHandler.set_enabled(connector_id, enabled)`` flips the ``disabled`` flag without touching keyring or grants. Reuses #976's atomic-write + chmod 0600 helpers; raises ``ConnectorsError`` on unknown / unconfigured ids - ``McpServerHandler.set_reload_callback`` setter so the FastAPI lifespan can attach a callback after the singleton handler imports - New endpoints ``POST /api/connectors/{id}/enable`` and ``/disable`` (CSRF-guarded, 400 on non-MCP types, 404 on unconfigured) - New SSE events ``connector.enabled`` / ``connector.disabled`` - ``_connector_summary`` exposes ``enabled: bool`` (defaults true for OAuth / not-yet-configured MCP so no spurious "Disabled" pills) - ``reload_all_session_agents_mcp`` broadcasts to every cached ChatAgent's per-instance MCPClientManager — wired as the handler's reload_callback at lifespan startup. Toggling takes effect live; no GAIA restart needed Frontend: - ``ConnectorRow.enabled: boolean`` on the wire - ``enableConnector`` / ``disableConnector`` API helpers - SSE consumer recognises ``'enabled' | 'disabled'`` reasons - Toggle row in MCPServerConfigureBody (only when configured), with helper text when disabled. Reuses existing ``.toggle-switch`` CSS - New ConnectorTileMenu (⋯) on each tile header for one-click enable/disable/disconnect without drilling in. Self-positioning popup, click-outside + Escape to close - New ``.connector-status.disabled`` pill in the tile header Tests: 30 new (12 handler + 14 router + 4 reload-wiring). Full connectors suite: 335 pass, 5 skipped, 1 pre-existing failure (test_oauth_pkce, unrelated).
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Closes #1004. Part of #927. Builds on #976 (PR #998). Users can now temporarily disable a configured MCP connector without losing its credentials or per-agent grants. Toggle off the GitHub MCP during a sensitive code review, toggle back on without re-pasting the PAT — credentials and agent consent persist across the round-trip. Persistence already worked: ``mcp_servers.json`` carries a per-entry ``disabled`` flag and ``MCPClientManager.load_from_config()`` already skips disabled entries. This PR adds the API/UI/wiring to drive it. Backend: - ``McpServerHandler.set_enabled(connector_id, enabled)`` flips the ``disabled`` flag without touching keyring or grants. Reuses #976's atomic-write + chmod 0600 helpers; raises ``ConnectorsError`` on unknown / unconfigured ids - ``McpServerHandler.set_reload_callback`` setter so the FastAPI lifespan can attach a callback after the singleton handler imports - New endpoints ``POST /api/connectors/{id}/enable`` and ``/disable`` (CSRF-guarded, 400 on non-MCP types, 404 on unconfigured) - New SSE events ``connector.enabled`` / ``connector.disabled`` - ``_connector_summary`` exposes ``enabled: bool`` (defaults true for OAuth / not-yet-configured MCP so no spurious "Disabled" pills) - ``reload_all_session_agents_mcp`` broadcasts to every cached ChatAgent's per-instance MCPClientManager — wired as the handler's reload_callback at lifespan startup. Toggling takes effect live; no GAIA restart needed Frontend: - ``ConnectorRow.enabled: boolean`` on the wire - ``enableConnector`` / ``disableConnector`` API helpers - SSE consumer recognises ``'enabled' | 'disabled'`` reasons - Toggle row in MCPServerConfigureBody (only when configured), with helper text when disabled. Reuses existing ``.toggle-switch`` CSS - New ConnectorTileMenu (⋯) on each tile header for one-click enable/disable/disconnect without drilling in. Self-positioning popup, click-outside + Escape to close - New ``.connector-status.disabled`` pill in the tile header Tests: 30 new (12 handler + 14 router + 4 reload-wiring). Full connectors suite: 335 pass, 5 skipped, 1 pre-existing failure (test_oauth_pkce, unrelated).
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Closes #976. Part of #927.
Three vulnerabilities shipped on
mainthat this PR fixes:Dual-writer / plaintext secret leak —
MCPConfig.add_server,POST /api/mcp/servers, andgaia mcp addall wrotemcp_servers.jsondirectly, bypassing the keyring. API keys ended up plaintext on disk. NowMcpServerHandler.configure()is the sole writer; everything else is read-only or deleted.Keyring exfiltration at MCP spawn time —
_resolve_keyring_refsaccepted any service string in a$keyringreference. A corruptedmcp_servers.jsoncould carry"Chrome Safe Storage:Chrome:..."and inject another app's secrets into a spawned MCP subprocess env. Now any service other thangaia.connectionsis rejected beforekeyring.get_passwordis called.Silent grant inheritance on reconnect —
disconnect()cleared keyring entries but leftgrants.jsonintact. Re-adding a connector with the same id silently re-attached prior agent consents — a real bypass. BothMcpServerHandlerandOAuthPkceHandlernow callrevoke_all_grants_for(connector_id)on disconnect.Plus:
rehype-rawinMessageBubble.tsxallowed LLM-generated<script>tags andjavascript:URLs to execute in the Electron renderer. Replaced withSAFE_DISALLOWED_ELEMENTS+safeUrlTransform(newsrc/utils/markdown.ts).Catalog reduction
The 22-entry MCP catalog is reduced to 5 tested entries:
mcp-github,mcp-filesystem,mcp-fetch,mcp-memory,mcp-git. The other 17 had zero test or doc coverage and are deleted. Users who want the deleted servers use the custom MCP path (tracked in #977).Test plan