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stack/packages/mosaic/README.md
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fix(mosaic): close claudex isolation gaps S1 (Bedrock/Vertex bypass) + S2 (fail-open catches)
Addresses MS-LEAD secrev REQUEST CHANGES on #806.

S1 (CRITICAL — REQ 2 defeated by provider switches + cloud creds): the env sweep
did not neutralize AWS Bedrock / GCP Vertex routing. CLAUDE_CODE_USE_BEDROCK /
CLAUDE_CODE_USE_VERTEX are routing switches whose mere presence makes Claude Code
talk to the real Anthropic API via the ambient cloud credential chain, bypassing
ANTHROPIC_BASE_URL (the loopback proxy) entirely — and the cloud credentials
(AWS_SECRET_ACCESS_KEY, AWS_BEARER_TOKEN_BEDROCK, GOOGLE_APPLICATION_CREDENTIALS,
…) passed straight through.
- buildClaudexEnv now force-deletes the routing switches by exact name
  (CLAUDEX_FORCED_UNSET_ENV) regardless of value — a name pattern is the wrong
  model for a boolean switch.
- CLAUDEX_CREDENTIAL_ENV_RE extended to the cloud-cred families (^AWS_,
  ^GOOGLE_APPLICATION_CREDENTIALS, ^GOOGLE_CLOUD_, ^GCP_) and the mid-string
  _KEY$ / _SECRET gap (STRIPE_SECRET_KEY, SSH_PRIVATE_KEY, AWS_SECRET_ACCESS_KEY).
- Doc-comment updated to match reality.

S2 (HIGH — fail-open contradicts documented fail-closed): defaultCanonicalizeIntended
and defaultIsSymlink swallowed ANY fs error. Now they distinguish ENOENT
(genuinely absent → safe to continue) from every other errno (ELOOP, EACCES,
ENOTDIR, …) which rethrows and fails CLOSED.

Tests (TDD red-first, 4 new specs red before the fix): Bedrock/Vertex switches +
AWS/GCP creds swept while the loopback proxy stays the only route; mid-string
_KEY/_SECRET closed; real-FS ELOOP (canonicalize) and ENOTDIR (isSymlink) fail
closed; injected EACCES not swallowed.

New-module coverage 100% stmts/lines, 93.75% branch. Full mosaic suite 1169 green;
typecheck / lint / format:check green. No --no-verify.

Refs #790

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-16 17:00:04 -05:00

4.9 KiB

@mosaicstack/mosaic

CLI package for the Mosaic self-hosted AI agent platform.

Usage

mosaic wizard           # First-run setup wizard
mosaic gateway install  # Install the gateway daemon
mosaic config show      # View current configuration
mosaic config hooks list  # Manage Claude hooks

Headless / CI Installation

Set MOSAIC_ASSUME_YES=1 (or ensure stdin is not a TTY) to skip all interactive prompts. The following environment variables control the install:

Gateway configuration (mosaic gateway install)

Variable Default Required
MOSAIC_STORAGE_TIER local No
MOSAIC_GATEWAY_PORT 14242 No
MOSAIC_DATABASE_URL (none) Yes if tier=team
MOSAIC_VALKEY_URL (none) Yes if tier=team
MOSAIC_ANTHROPIC_API_KEY (none) No
MOSAIC_CORS_ORIGIN http://localhost:3000 No

Admin user bootstrap

Variable Default Required
MOSAIC_ADMIN_NAME (none) Yes (headless)
MOSAIC_ADMIN_EMAIL (none) Yes (headless)
MOSAIC_ADMIN_PASSWORD (none) Yes (headless)

MOSAIC_ADMIN_PASSWORD must be at least 8 characters. In headless mode a missing or too-short password causes a non-zero exit.

Example: Docker / CI install

export MOSAIC_ASSUME_YES=1
export MOSAIC_ADMIN_NAME="Admin"
export MOSAIC_ADMIN_EMAIL="admin@example.com"
export MOSAIC_ADMIN_PASSWORD="securepass123"

mosaic gateway install

Runtime launchers

mosaic claude            # Launch Claude Code with Mosaic injection
mosaic yolo claude       # …with --dangerously-skip-permissions
mosaic codex | opencode | pi

mosaic claudex (EXPERIMENTAL)

Runs GPT models inside the Claude Code harness by pointing Claude Code at a local claude-code-proxy that translates the Anthropic Messages API to a ChatGPT-subscription (Codex OAuth) backend. This is not Anthropic Claude — model behavior, tool use, and output quality may differ. Intended for evaluation, not production delivery.

mosaic claudex           # launch (prompts through the proxy readiness gate)
mosaic yolo claudex      # …with --dangerously-skip-permissions
mosaic claudex --print "hello"   # trailing args are forwarded to Claude Code

Prerequisite: the claude-code-proxy binary must be installed and authenticated (claude-code-proxy codex auth …). mosaic claudex runs a preflight that verifies the binary, the OAuth state (triggering a device re-auth if needed), and a trusted local listener before launching; it fails closed if the proxy cannot be brought up with a verified identity.

Isolation (never touches your real Claude state). claudex always launches against an isolated CLAUDE_CONFIG_DIR (default ~/.config/mosaic/claudex/home). The ambient CLAUDE_CONFIG_DIR is deliberately ignored, and a guard proves the resolved dir can never be — or live under — the real ~/.claude. A claudex session therefore cannot mutate your normal Claude Code config.

No token leakage. claudex never reads the proxy's credential file. Claude Code is handed only ANTHROPIC_AUTH_TOKEN=unused pointed at the loopback proxy; the entire credential-bearing env family (ANTHROPIC_*, AWS_*, GOOGLE_CLOUD_*, GOOGLE_APPLICATION_CREDENTIALS, *_TOKEN, *_KEY, *_SECRET, …) is stripped from the composed environment. The Bedrock/Vertex routing switches (CLAUDE_CODE_USE_BEDROCK, CLAUDE_CODE_USE_VERTEX, and the _SKIP_*_AUTH pair) are force-removed regardless of value — otherwise their mere presence would route Claude Code to the real Anthropic API via AWS/GCP and bypass the proxy. The proxy holds the real OAuth credential.

Model tiers (override via env).

Tier Env var Default
primary (opus/sonnet) ANTHROPIC_MODEL gpt-5.6-sol
small/fast (haiku) ANTHROPIC_SMALL_FAST_MODEL gpt-5.6-luna

Operator-provided values win over the defaults. Additional overrides: MOSAIC_CLAUDEX_CONFIG_DIR (isolated config dir), ANTHROPIC_BASE_URL (proxy endpoint).

Hooks management

After running mosaic wizard, Claude hooks are installed in ~/.claude/hooks-config.json.

mosaic config hooks list              # Show all hooks and enabled/disabled status
mosaic config hooks disable PostToolUse  # Disable a hook (reversible)
mosaic config hooks enable PostToolUse   # Re-enable a disabled hook

Set CLAUDE_HOME to override the default ~/.claude directory.