Introduces api/manifest_validator.py as a single security chokepoint
imported by both ServiceComposer and ServiceStoreManager:
- validate_manifest(): rejects kind=builtin, reserved container names,
reserved subdomains, backend denylist (localhost, cell-api, etc.),
cap_add outside allowlist / in denylist, shell-string provision hooks,
and env values with shell-special characters
- validate_rendered_compose(): walks the rendered YAML and rejects
privileged:true, host network/pid/ipc/userns, absolute bind mounts,
denied capabilities, devices key, apparmor/seccomp unconfined, and
string-form command/entrypoint (shell-injection vector)
- validate_provision_hook(): requires argv list form, lowercase binary,
rejects NUL bytes
ServiceStoreManager changes:
- _validate_manifest() delegates to validate_manifest() after existing checks
- _fetch_manifest() and fetch_index() now stream with a 256 KB size cap
(prevents memory exhaustion from a malicious or compromised index)
- Digest-pin warning for images missing @sha256 (hard error for unknown
registries, warning for git.pic.ngo/roof/* and TRUSTED_IMAGES_NO_DIGEST)
ServiceComposer changes:
- write_compose() calls validate_rendered_compose() before any disk write
so no partial file is left if validation fails
- render_template() substitutes ${PIC_DATA_DIR} with the resolved data_dir path
102 new tests in tests/test_manifest_validator.py covering all five P0
security issues. Existing test mocks updated to use streaming response
pattern (stream=True + raw.read) and valid compose YAML templates.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
roof
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