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MockChain.ts
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MockChain.ts
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/* eslint-disable @typescript-eslint/no-magic-numbers */
import { addMinutes } from 'date-fns';
import { DnssecAlgorithm } from '../DnssecAlgorithm.js';
import type { RrSet } from '../utils/dns/RrSet.js';
import type { IDatePeriod } from '../dates.js';
import type { DsResponse, ZoneResponseSet } from '../dnssecResponses.js';
import { Message } from '../utils/dns/Message.js';
import type { Resolver } from '../Resolver.js';
import type { DsData } from '../records/DsData.js';
import type { TrustAnchor } from '../TrustAnchor.js';
import { SecurityStatus } from '../SecurityStatus.js';
import { RCODE_IDS } from '../utils/dns/ianaRcodes.js';
import { getZonesInName } from '../utils/dns/name.js';
import type { MockChainFixture } from './MockChainFixture.js';
import type { SignatureOptions } from './SignatureOptions.js';
import { ZoneSigner } from './ZoneSigner.js';
export class MockChain {
public static async generate(zoneName: string): Promise<MockChain> {
const zoneNames = getZonesInName(zoneName);
const signers = await Promise.all(
zoneNames.map(async (name) => ZoneSigner.generate(DnssecAlgorithm.RSASHA256, name)),
);
return new MockChain(signers);
}
protected constructor(protected readonly signers: readonly ZoneSigner[]) {}
protected generateZoneResponses(signatureOptions: SignatureOptions): readonly ZoneResponseSet[] {
const [rootSigner] = this.signers;
let parentSigner = rootSigner;
let parentDnskeyTag: number | null = null;
return this.signers.map((signer) => {
const zoneResponses = signer.generateZoneResponses(parentSigner, parentDnskeyTag, {
dnskey: signatureOptions,
ds: signatureOptions,
});
parentSigner = signer;
parentDnskeyTag = zoneResponses.ds.data.keyTag;
return zoneResponses;
});
}
private generateBogusResponses(
rrset: RrSet,
zoneResponses: Message[],
apexDs: DsResponse,
apexSigner: ZoneSigner,
signatureOptions: SignatureOptions,
) {
const invalidKeyTag = Math.ceil(apexDs.data.keyTag / 2) + 2;
const rrsig = apexSigner.generateRrsig(rrset, invalidKeyTag, signatureOptions);
return [...zoneResponses, rrsig.message];
}
private generateInsecureResponses(
rrset: RrSet,
zoneResponses: Message[],
apexSigner: ZoneSigner,
apexDs: DsResponse,
signatureOptions: SignatureOptions,
) {
const rrsig = apexSigner.generateRrsig(rrset, apexDs.data.keyTag, signatureOptions);
return [
...zoneResponses.map((response) =>
response === apexDs.message
? new Message({ rcode: RCODE_IDS.NXDOMAIN }, response.questions, [])
: response,
),
rrsig.message,
];
}
private generateIndeterminateResponses(
rrset: RrSet,
zoneResponses: Message[],
apexSigner: ZoneSigner,
apexDs: DsResponse,
apexResponses: ZoneResponseSet | undefined,
signatureOptions: SignatureOptions,
) {
const rrsig = apexSigner.generateRrsig(rrset, apexDs.data.keyTag, signatureOptions);
const apexDnskey = apexResponses!.dnskey;
const unsignedApexDnskeyMessage = new Message(
apexDnskey.message.header,
apexDnskey.message.questions,
[apexDnskey.record],
);
return [
...zoneResponses.filter((response) => response !== apexDnskey.message),
unsignedApexDnskeyMessage,
rrsig.message,
];
}
private generateSecureResponses(
rrset: RrSet,
zoneResponses: Message[],
apexSigner: ZoneSigner,
apexDs: DsResponse,
signatureOptions: SignatureOptions,
) {
const rrsig = apexSigner.generateRrsig(rrset, apexDs.data.keyTag, signatureOptions);
return [...zoneResponses, rrsig.message];
}
private generateResponses(
responsesByZone: readonly ZoneResponseSet[],
status: SecurityStatus,
rrset: RrSet,
signatureOptions: SignatureOptions,
) {
const apexResponses = responsesByZone.at(-1);
const apexDs = apexResponses!.ds;
const apexSigner = this.signers.at(-1)!;
const zoneResponses = responsesByZone.flatMap((set) => [set.ds.message, set.dnskey.message]);
let responses: readonly Message[];
switch (status) {
case SecurityStatus.INSECURE: {
responses = this.generateInsecureResponses(
rrset,
zoneResponses,
apexSigner,
apexDs,
signatureOptions,
);
break;
}
case SecurityStatus.BOGUS: {
responses = this.generateBogusResponses(
rrset,
zoneResponses,
apexDs,
apexSigner,
signatureOptions,
);
break;
}
case SecurityStatus.INDETERMINATE: {
responses = this.generateIndeterminateResponses(
rrset,
zoneResponses,
apexSigner,
apexDs,
apexResponses,
signatureOptions,
);
break;
}
default: {
responses = this.generateSecureResponses(
rrset,
zoneResponses,
apexSigner,
apexDs,
signatureOptions,
);
break;
}
}
return responses;
}
protected generateResolver(responses: readonly Message[]): Resolver {
// eslint-disable-next-line @typescript-eslint/require-await
return async (question) => {
const matchingResponse = responses.find((response) => response.answersQuestion(question));
return matchingResponse ?? new Message({ rcode: RCODE_IDS.NXDOMAIN }, [question], []);
};
}
protected generateTrustAnchors(dsData: DsData): readonly TrustAnchor[] {
return [
{
keyTag: dsData.keyTag,
algorithm: dsData.algorithm,
digestType: dsData.digestType,
digest: dsData.digest,
},
];
}
public generateFixture(
rrset: RrSet,
status: SecurityStatus,
signaturePeriod?: IDatePeriod,
): MockChainFixture {
const now = new Date();
const signatureOptions: SignatureOptions = signaturePeriod
? { signatureInception: signaturePeriod.start, signatureExpiry: signaturePeriod.end }
: { signatureInception: now, signatureExpiry: addMinutes(now, 1) };
const responsesByZone = this.generateZoneResponses(signatureOptions);
const responses = this.generateResponses(responsesByZone, status, rrset, signatureOptions);
const resolver = this.generateResolver(responses);
const rootResponses = responsesByZone.at(0);
const trustAnchors = this.generateTrustAnchors(rootResponses!.ds.data);
return { resolver, trustAnchors, responses };
}
}