feat: add SendGrid Event Webhook signature verifier#26
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Adds a `sendgrid` verifier type that authenticates SendGrid Event Webhook (and Inbound Parse) deliveries using ECDSA P-256 over SHA-256 of `timestamp + payload`. The public key is supplied as PEM or as the base64-encoded DER (SubjectPublicKeyInfo) shown in the SendGrid UI. An optional `max_timestamp_age` enables replay protection. Closes #25
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Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
Docker Images BuiltImages are available for testing: # gatekeeperd
docker pull ghcr.io/tight-line/gatekeeperd:pr-26-4f9dc71
# gatekeeper-relay
docker pull ghcr.io/tight-line/gatekeeper-relay:pr-26-4f9dc71docker-compose.ymlGATEKEEPERD_IMAGE=ghcr.io/tight-line/gatekeeperd:pr-26-4f9dc71 \
RELAY_IMAGE=ghcr.io/tight-line/gatekeeper-relay:pr-26-4f9dc71 \
docker-compose --profile relay upHelm (values override)image:
repository: ghcr.io/tight-line/gatekeeperd # or gatekeeper-relay
tag: "pr-26-4f9dc71"Images expire ~15 days after PR closes. |
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Summary
sendgridverifier type for SendGrid Event Webhook (and Inbound Parse) authenticationSHA256(timestamp + raw_body), base64(ASN.1 DER) encoded inX-Twilio-Email-Event-Webhook-Signaturemax_timestamp_ageenables replay protectionconfigmap.yaml, the example config, and theconfigure-routeskillCloses #25
Test plan
make check— lint, 100% coverage in touched packages, both binaries buildhelm lint charts/gatekeeperdcleanmax_timestamp_age=0skip path, and key-parsing error branches (empty, garbage, non-DER, RSA, wrong curve)