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8e4b5d8774
Follow-up hardening on top of the C14 cherry-picks (#57860/#44026/#66742/#60009): - Slack file downloads (_download_slack_file/_download_slack_file_bytes) now require an https URL on a Slack CDN host (files.slack.com, *.slack.com Enterprise Grid, *.slack-files.com legacy shares) before attaching the bot token. url_private/url_private_download only ever point at the Slack CDN, so a forged file object from a malicious workspace app or compromised event stream pointing the Bearer-token download at an arbitrary PUBLIC host (token exfiltration) is now refused — a hole #44026's generic private-IP SSRF check alone could not close. - The same two download paths now use create_ssrf_safe_async_client (from #57860) so the preflight-validated hostname is resolved once, validated, and dialed by IP — closing the DNS-rebinding TOCTOU window for the token-bearing inbound fetches as well. - #60009's slack_tokens.json permission warning is generalized into utils.warn_if_credential_file_broadly_readable() (POSIX-only, fail-quiet) and wired into the other read path with the same gap: google_chat's load_user_credentials(). google_chat already writes 0o600 via _write_private_json; the read-time warning covers hand-provisioned/legacy files. Nothing in-repo writes slack_tokens.json (user/OAuth-provisioned), so there is no write path to chmod for Slack. Security tests both directions: non-CDN/lookalike/http URLs and connect-time DNS rebinds are blocked before any TCP connect; real files.slack.com, Enterprise Grid, and slack-files.com URLs still reach the network layer; 0o600 files stay silent while 0o644/0o640 warn with a chmod hint. A/B: all 10 new download-guard tests fail with the hardening reverted and pass with it applied. |
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