StasonJatham
e8f7d6bfdf
Single stateless Go process that consumes CT logs via embedded (patched) CertSpotter internals, classifies cloud/database/storage DNS identifiers in-process with a zero-allocation classifier, enriches via round-robin DNS resolvers with CNAME following, and batch-writes useful findings to PostgreSQL. - third_party/certspotter: 2-hunk IdentifierSink patch, no stdout/JSON/files - internal/classify: AWS/Azure/GCP/Firebase/Cloudflare R2/DigitalOcean/Supabase/OCI - internal/dns: sharded bounded TTL cache, multi-resolver load balancing + failover - internal/pipeline: bounded queues, dedup, direct-priority load shedding - internal/store: pgx batch writer, Postgres CT checkpoints (no cert contents) - internal/probe: optional non-destructive reachability checks (off by default) - Docker: distroless non-root, read-only rootfs, no app volume, resource limits - tests enforce 0 allocs/op on the classifier and sink hot path
68 lines
2.0 KiB
Go
68 lines
2.0 KiB
Go
// Copyright (C) 2025 Opsmate, Inc.
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License, v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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//
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// This software is distributed WITHOUT A WARRANTY OF ANY KIND.
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// See the Mozilla Public License for details.
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package ctcrypto
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/rsa"
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"crypto/x509"
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"fmt"
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"software.sslmate.com/src/certspotter/tlstypes"
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)
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type PublicKey []byte
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func (key PublicKey) Verify(input SignatureInput, signature tlstypes.DigitallySigned) error {
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parsedKey, err := x509.ParsePKIXPublicKey(key)
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if err != nil {
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return fmt.Errorf("error parsing log key: %w", err)
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}
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switch key := parsedKey.(type) {
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case *rsa.PublicKey:
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if signature.Algorithm.Signature != tlstypes.RSA {
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return fmt.Errorf("log key is RSA but this is not an RSA signature")
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}
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if signature.Algorithm.Hash != tlstypes.SHA256 {
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return fmt.Errorf("unsupported hash algorithm %v (only SHA-256 is allowed in CT)", signature.Algorithm.Hash)
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}
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if rsa.VerifyPKCS1v15((*rsa.PublicKey)(key), crypto.SHA256, input[:], signature.Signature) != nil {
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return fmt.Errorf("RSA signature is incorrect")
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}
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return nil
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case *ecdsa.PublicKey:
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if signature.Algorithm.Signature != tlstypes.ECDSA {
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return fmt.Errorf("log key is ECDSA but this is not an ECDSA signature")
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}
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if signature.Algorithm.Hash != tlstypes.SHA256 {
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return fmt.Errorf("unsupported hash algorithm %v (only SHA-256 is allowed in CT)", signature.Algorithm.Hash)
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}
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if !ecdsa.VerifyASN1((*ecdsa.PublicKey)(key), input[:], signature.Signature) {
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return fmt.Errorf("ECDSA signature is incorrect")
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}
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default:
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return fmt.Errorf("unsupported public key type %T (CT only allows RSA and ECDSA)", key)
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}
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return nil
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}
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func (key PublicKey) MarshalBinary() ([]byte, error) {
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return bytes.Clone(key), nil
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}
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func (key *PublicKey) UnmarshalBinary(data []byte) error {
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*key = bytes.Clone(data)
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return nil
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}
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