3 commits

Author	SHA1	Message	Date
Adam Moussa	acc1961d21	feat: template-first WO parser + Bedrock fallback, PO Bedrock switch (#99) ... * Add deterministic template parser for WO emails The workorder-email-processor sends every one of ~22.9k emails/month to an LLM, but ~93.6% are the plain-text "AMAZON UPDATE WO DETAILS" comment template and ~6.4% the HTML "AMAZON assign Work Order" template. Parse those two shapes deterministically, offline, so the AI call is reserved for the long tail. The module is pure (no boto3, no network). try_deterministic_parse classifies by subject, extracts the shared contract fields, and returns a result ONLY when it passes a strict fail-closed validation gate: exact contract-key set, subject/id agreement, the literal "Work Order: <id>" double space, per-type required fields, site-code shape, and a label-bleed guard so a value that over-ran into the next field fails. Any miss, drift, or extractor exception yields None so the caller falls back to the AI extractor -- data is never corrupted, only the fallback rate rises. Refs: #23 * Migrate WO processor to Bedrock and fix comment_id collision Switch the AI path from the Anthropic SDK to bedrock-runtime InvokeModel on the inference profile us.anthropic.claude-haiku-4-5-20251001-v1:0 (BEDROCK_MODEL_ID env), so parsing no longer needs a provider API key or Secrets Manager secret. The EXTRACTION_PROMPT and JSON contract are kept byte-identical, so the AI-fallback output is unchanged. Try the new deterministic template parser first and only call Bedrock on a miss/invalid result. Fix issue #23: the WorkOrderComments range key was work_order_id#<comment_time>, so two emails on one WO with an identical or absent comment time collided and overwrote each other. Derive a 12-hex suffix from the S3 object key alone -- deterministic, so an async retry of the same object is byte-identical (idempotent) while distinct emails get distinct keys -- and keep wall-clock now() out of the key (literal 'nocomment' segment when comment_time is absent). Also emit one CloudWatch EMF line per record (Seahaven/WorkorderIngest ParseOutcome, dimensioned by ParseMethod/TemplateId) for parse-outcome observability, replace the deprecated datetime.utcnow() with datetime.now(timezone.utc), and drop the anthropic dependency. Refs: #23 * Migrate PO processor to Bedrock Switch the PO email processor's AI extraction from the Anthropic SDK to bedrock-runtime InvokeModel on the inference profile us.anthropic.claude-haiku-4-5-20251001-v1:0 (BEDROCK_MODEL_ID env), so it no longer needs a provider API key or Secrets Manager secret. PO parsing stays fully AI -- only the provider changes. The EXTRACTION_PROMPT is kept byte-identical and the Bedrock text output is still decoded with json.loads(..., parse_float=Decimal), which DynamoDB requires (it rejects floats). Replace the deprecated datetime.utcnow() with datetime.now(timezone.utc) and drop the anthropic dependency. * Grant Bedrock IAM, drop Anthropic secrets, add fallback alarm Both stacks moved their processors from the Anthropic API to the Bedrock inference profile us.anthropic.claude-haiku-4-5-20251001-v1:0. Grant each processor role bedrock:InvokeModel + bedrock:InvokeModelWithResponseStream on BOTH the inference-profile ARN AND the per-region foundation-model ARNs for us-east-1/us-east-2/us-west-2 (empty-account) -- the us.* profile routes cross-region, so a profile-only grant AccessDenies at runtime. Remove both anthropic-api-key Secret constructs, their grant_read, and the ANTHROPIC_API_KEY_SECRET_ARN env; add BEDROCK_MODEL_ID. The secrets had RemovalPolicy.RETAIN so they are orphaned, not deleted -- flagged in the README for manual post-deploy deletion and key revocation. Add the workorder-email-processor-template-fallback-rate alarm: a FILL(0) + >=10-sample volume-floor MathExpression over the EMF ParseOutcome metric (15-min periods) that pages when the AI-fallback share exceeds 15% sustained, catching Hexagon template drift. ALARM-only SnsAction to site-alerts, no OK action, NOT_BREACHING, matching the existing stack idiom. * Add offline WO parser test suite Cover the deterministic parser with golden-file tests over 55 real scrubbed .eml fixtures (both comment sub-shapes, username Submitted-By, address present/absent, br+CRLF assign addresses), fail-closed validation-gate rules, adversarial and prompt-injection cases that must route to ai_fallback or parse without corrupting other fields, the issue #23 comment_id idempotency invariants, and the Bedrock-fallback dispatch plus EMF-metric emission with a mocked invoke_model. Extend pytest.ini testpaths to discover the co-located suite, and update tests/conftest.load_handler to put a handler's own directory on sys.path so the WO handler's new `from template_parser import ...` resolves under the existing shared handler tests. Point test_local.py at the new template-first + Bedrock flow. Refs: #23 * Document Bedrock migration and WO parse flow in README Record the provider switch to the Bedrock inference profile (no Anthropic API key or Secrets Manager secret, with the retired secrets flagged for manual deletion), the WO deterministic-template-first + AI-fallback flow, the new ParseOutcome EMF metric and template-fallback-rate alarm, the issue #23 comment_id format change, the +00:00 aware-UTC timestamp shift, and offline test instructions. Refs: #23 * Fix f-string lint and formatting in backfill scripts Drop the f prefix from two f-strings that carry no placeholders (F541) and apply ruff format, so `ruff check` / `ruff format --check` pass in CI. * Emit ParseMethod-only EMF set so fallback alarm can fire The fallback-rate alarm queries the ParseOutcome series keyed on ParseMethod alone, but the emitter published only the joint (ParseMethod, TemplateId) dimension set. CloudWatch materializes exactly the listed dimension sets and does not auto-aggregate, so the alarm's series never received data: it evaluated a constant 0 and could never page on template-drift coverage collapse. Publish both ["ParseMethod"] and ["ParseMethod","TemplateId"] and update the EMF regression test to assert both sets are present. * Commit WO parser .eml fixtures for executable coverage The parser test suite globbed for input .eml fixtures that the repo's `*.eml` ignore rule kept uncommitted, so every parametrized golden and fail-closed test collected zero cases and CI could not exercise the deterministic parser that handles 100% of WO email volume. Add a fixtures-only negation to .gitignore and commit the 55 scrubbed positive samples (50 update-plaintext, 5 assign-html) plus 14 ai-fallback and 3 adversarial fixtures. The ai-fallback set covers each fail-closed reason code (subject_no_match, single_space_work_order, malformed_site_code, label_bleed, creation_time_unparseable, wo_id_mismatch, missing_required_field) and the adversarial set proves the parser is total and confines prompt-injection payloads to comment_text without steering the structured fields. * Fix WO parser advisories A1-A3 (PR #99 follow-ups) A1 — AI-fallback comment_id nondeterminism: parsed comment_time is model output and not stable across Lambda async retries, so on the ai_fallback path the comment_id range-key time segment now derives from the email Date header (deterministic per S3 object) instead of the model's comment_time. The template path is unchanged (its comment_time is a pure function of the raw email). Bedrock invoke pins temperature 0 so retries reproduce the same extraction. Closes the #23 reopening on the AI path. A2 — EMF record now carries the spec-required _aws.Timestamp (epoch ms) so CloudWatch reliably extracts the ParseOutcome datapoint that the fallback-rate alarm depends on. A3 — T1 New Comment capture no longer truncates at the first blank line; multi-paragraph comments are captured through internal blanks and terminate at the next label/separator. 17 golden files regenerated from the real fixtures accordingly. Hardening from the sh-security-review pass on this diff: - _header_date_iso is total: OverflowError/OSError from an extreme Date header fall back to 'nocomment' instead of failing the invocation. - _capture_block trims blanks in O(n) (no pop(0)) — removes a quadratic path on a crafted large blank run. - work_order_id is enforced digits-only on BOTH parse paths before it is used as a DynamoDB key, so prompt-injected AI output cannot forge '#' range-key segments or land on an arbitrary WO.	2026-07-16 12:45:11 -04:00
Adam Moussa	7b9e26d79d	Add fail-closed SES sender authentication (INFRA-107) (#98) ... * Add fail-closed SES sender authentication The From header and any raw-MIME Authentication-Results copies are attacker-forgeable, so a forged email to apm@int.seahaven.com or amazon_po@int.seahaven.com could create or mutate a WO/PO (INFRA-107, CRITICAL). Both S3-triggered email processors now authenticate the sender against the Authentication-Results header SES itself prepends at delivery: only the topmost header is consulted, its authserv-id must be amazonses.com, and it must carry dkim=pass for a domain in the per-pipeline ALLOWED_DKIM_DOMAINS env var (comma-separated, set in CDK so ops can adjust without code changes). Allowlists come from live traffic observed 2026-07-15 on both ingest buckets: WO mail arrives via the apm@ Google Groups forward, which re-signs as seahaven.com (the hxgnsmartcloud.com signature does not survive the forward); PO mail passes for amazon.coupahost.com. amazonses.com also passes on PO mail but is deliberately excluded -- every SES customer's outbound mail passes for it. Every failure path (env var unset, header missing or unparseable, verdict fail, unaligned domain) rejects the email: a structured warning with the reason and S3 key is logged and the record skipped without erroring the invocation, so rejected mail causes no Lambda retries or DLQ messages. Handler signatures and event sources are unchanged. Refs: INFRA-107 * Harden AR parser per cross-family review Cross-family (GPT-4.1) review findings: terminate the dkim result token at end-of-clause, whitespace, or a comment so a value like "dkim=pass-fake" can never be read as a pass; normalize trailing dots off allowlist entries so "seahaven.com." matches; make the compat32 parser policy explicit. Adds tests for result-token boundaries, comments after the result, quoted domain values, and folding inside a dkim clause. Refs: INFRA-107 * Harden AR parsing and alarm on sender-auth rejects The SES-stamped Authentication-Results value echoes attacker-controlled SMTP-session tokens (envelope-from, helo, header.from) as their own semicolon-delimited property clauses. A naive split(";") tore an RFC 5321 quoted-local-part MAIL FROM apart and manufactured a forged dkim=pass clause, so a fully spoofed email was accepted on the genuinely SES-stamped topmost header. Tokenise comment- and quoted-string-aware (RFC 8601 / RFC 5322): strip CFWS comments, split clauses only on semicolons outside a quoted-string, and fail closed on unbalanced quotes/comments so a ';' inside a quoted pvalue can never start a clause. Rejected mail returns normally (no error, no retry, no DLQ message), so a signing-domain drift or a wrong allowlist would silently discard 100% of legitimate mail while every alarm stayed green. Add a CloudWatch Logs metric filter + alarm on the sender_auth_rejected warning to both stacks so a false-reject storm pages instead of vanishing. This is also the safety net for the WO seahaven.com allowlist assumption, which must be validated against a live SES-stamped header (a plain Gmail auto-forward re-signs under the sending Workspace domain, not seahaven.com). Refs: INFRA-107 * chore: retrigger CI (no run recorded for 7c74ac1) * Fix quoted-AUID DKIM domain spoof in sender auth Resolve three confirmed /sh-security-review findings on the fail-closed SES sender-authentication control. HIGH: header.i/header.d domain extraction was not quoted-string aware. An attacker with a valid DKIM key for their own domain could set an RFC 6376-legal AUID such as i="@seahaven.com"@attacker.com; the naive extractor stopped at the closing quote and returned seahaven.com, accepting forged mail. Extraction now tokenises the clause with the same quoted-string discipline already used for clause splitting: header.d (the plain signing domain) is authoritative when present, otherwise the header.i domain is the part after the AUID's LAST top-level "@", so a "@" inside a quoted local-part is treated as signer-controlled label text and yields the true signer (attacker.com), not seahaven.com. LOW: the topmost-header parse ran outside evaluate_sender_authentication's try/except, so an unexpected parser exception on crafted input could propagate into the handler and Lambda async retries/DLQ. The parse now fails CLOSED with an authentication_results_unparseable reason. MEDIUM: the sender_auth_rejected alarm used Sum>=3 over 15 min, blind to a low-volume total-reject outage (a trickle that never sums to 3). Both stacks now alarm on >=1 reject per 5-min period with evaluation_periods=3 / datapoints_to_alarm=2, so a sustained reject condition pages even at one reject per period while a lone stray probe self-clears. Refs: INFRA-107 * Load Lambda function dir on sys.path in tests Rebasing INFRA-107 onto main folded #95's pytest suite into this branch's tests. The unified conftest loads the PO/WO handlers by file path, and handler.py now does `from ses_auth import authenticate_inbound_email` -- a bare sibling import that resolves in the Lambda only because the runtime puts each function's own directory on sys.path. The shared load_handler now adds that directory so the handler tests import correctly alongside the sender-auth tests. Refs: INFRA-107 * Note #97 test files in README directory tree The rebase onto main brought in #97's tests/requirements.txt and tests/test_po_merge.py. List both in the directory tree so it matches the tree on disk. Refs: INFRA-107 * Document INFRA-107 forwarder-binding risk acceptance Record the accepted risk that WO sender auth binds to the apm@ forward's re-signing domain (seahaven.com) rather than the Hexagon originator; the apm@ Google Group's restricted posting policy is the load-bearing control (escalates to HIGH if the group is opened to external posting). Also correct the sender-auth-rejected alarm docs to match the shipped config (>=1 per 5-min, 2-of-3 datapoints, not the superseded >=3/15min) and note the SES-AR-01/02 parser hardening follow-ups. Refs: INFRA-107	2026-07-15 20:58:47 -04:00
Adam Moussa	941a0ec0fe	Add pytest suite and enable tests in CI (#95) ... The repo had no automated tests, so regressions in the email parsing pipeline could only be caught manually. The reusable ci-python-sam workflow already supports a run-tests input at the pinned SHA; enable it and add a first suite covering the pure functions pad_zip and parse_raw_email. tests/conftest.py sets AWS_DEFAULT_REGION and dummy credentials before any handler import because the handlers create boto3 clients at module import time, and loads each handler.py via importlib under a unique module name since the files share a basename. pytest.ini scopes discovery to tests/ so the manual test_local.py script at the repo root is not collected.	2026-07-15 19:06:20 -04:00