62 lines
2.5 KiB
JavaScript
Executable file
62 lines
2.5 KiB
JavaScript
Executable file
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.verifyIntotoTLogBody = void 0;
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/*
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Copyright 2023 The Sigstore Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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const error_1 = require("../error");
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// Compare the given intoto tlog entry to the given bundle
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function verifyIntotoTLogBody(tlogEntry, content) {
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switch (tlogEntry.apiVersion) {
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case '0.0.2':
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return verifyIntoto002TLogBody(tlogEntry, content);
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default:
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throw new error_1.VerificationError({
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code: 'TLOG_BODY_ERROR',
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message: `unsupported intoto version: ${tlogEntry.apiVersion}`,
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});
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}
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}
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exports.verifyIntotoTLogBody = verifyIntotoTLogBody;
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// Compare the given intoto v0.0.2 tlog entry to the given DSSE envelope.
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function verifyIntoto002TLogBody(tlogEntry, content) {
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// Ensure the bundle's DSSE contains a single signature
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if (tlogEntry.spec.content.envelope.signatures?.length !== 1) {
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throw new error_1.VerificationError({
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code: 'TLOG_BODY_ERROR',
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message: 'signature count mismatch',
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});
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}
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// Signature is double-base64-encoded in the tlog entry
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const tlogSig = base64Decode(tlogEntry.spec.content.envelope.signatures[0].sig);
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// Ensure that the signature in the bundle's DSSE matches tlog entry
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if (!content.compareSignature(Buffer.from(tlogSig, 'base64')))
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throw new error_1.VerificationError({
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code: 'TLOG_BODY_ERROR',
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message: 'tlog entry signature mismatch',
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});
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// Ensure the digest of the bundle's DSSE payload matches the digest in the
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// tlog entry
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const tlogHash = tlogEntry.spec.content.payloadHash?.value || '';
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if (!content.compareDigest(Buffer.from(tlogHash, 'hex'))) {
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throw new error_1.VerificationError({
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code: 'TLOG_BODY_ERROR',
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message: 'DSSE payload hash mismatch',
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});
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}
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}
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function base64Decode(str) {
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return Buffer.from(str, 'base64').toString('utf-8');
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}
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