557 lines
22 KiB
JavaScript
557 lines
22 KiB
JavaScript
'use strict';
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var utilHexEncoding = require('@smithy/util-hex-encoding');
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var utilUtf8 = require('@smithy/util-utf8');
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var isArrayBuffer = require('@smithy/is-array-buffer');
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var protocolHttp = require('@smithy/protocol-http');
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var utilMiddleware = require('@smithy/util-middleware');
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var utilUriEscape = require('@smithy/util-uri-escape');
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const ALGORITHM_QUERY_PARAM = "X-Amz-Algorithm";
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const CREDENTIAL_QUERY_PARAM = "X-Amz-Credential";
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const AMZ_DATE_QUERY_PARAM = "X-Amz-Date";
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const SIGNED_HEADERS_QUERY_PARAM = "X-Amz-SignedHeaders";
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const EXPIRES_QUERY_PARAM = "X-Amz-Expires";
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const SIGNATURE_QUERY_PARAM = "X-Amz-Signature";
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const TOKEN_QUERY_PARAM = "X-Amz-Security-Token";
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const REGION_SET_PARAM = "X-Amz-Region-Set";
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const AUTH_HEADER = "authorization";
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const AMZ_DATE_HEADER = AMZ_DATE_QUERY_PARAM.toLowerCase();
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const DATE_HEADER = "date";
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const GENERATED_HEADERS = [AUTH_HEADER, AMZ_DATE_HEADER, DATE_HEADER];
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const SIGNATURE_HEADER = SIGNATURE_QUERY_PARAM.toLowerCase();
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const SHA256_HEADER = "x-amz-content-sha256";
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const TOKEN_HEADER = TOKEN_QUERY_PARAM.toLowerCase();
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const HOST_HEADER = "host";
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const ALWAYS_UNSIGNABLE_HEADERS = {
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authorization: true,
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"cache-control": true,
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connection: true,
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expect: true,
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from: true,
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"keep-alive": true,
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"max-forwards": true,
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pragma: true,
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referer: true,
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te: true,
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trailer: true,
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"transfer-encoding": true,
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upgrade: true,
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"user-agent": true,
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"x-amzn-trace-id": true,
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};
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const PROXY_HEADER_PATTERN = /^proxy-/;
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const SEC_HEADER_PATTERN = /^sec-/;
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const UNSIGNABLE_PATTERNS = [/^proxy-/i, /^sec-/i];
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const ALGORITHM_IDENTIFIER = "AWS4-HMAC-SHA256";
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const ALGORITHM_IDENTIFIER_V4A = "AWS4-ECDSA-P256-SHA256";
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const EVENT_ALGORITHM_IDENTIFIER = "AWS4-HMAC-SHA256-PAYLOAD";
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const UNSIGNED_PAYLOAD = "UNSIGNED-PAYLOAD";
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const MAX_CACHE_SIZE = 50;
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const KEY_TYPE_IDENTIFIER = "aws4_request";
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const MAX_PRESIGNED_TTL = 60 * 60 * 24 * 7;
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const signingKeyCache = {};
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const cacheQueue = [];
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const createScope = (shortDate, region, service) => `${shortDate}/${region}/${service}/${KEY_TYPE_IDENTIFIER}`;
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const getSigningKey = async (sha256Constructor, credentials, shortDate, region, service) => {
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const credsHash = await hmac(sha256Constructor, credentials.secretAccessKey, credentials.accessKeyId);
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const cacheKey = `${shortDate}:${region}:${service}:${utilHexEncoding.toHex(credsHash)}:${credentials.sessionToken}`;
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if (cacheKey in signingKeyCache) {
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return signingKeyCache[cacheKey];
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}
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cacheQueue.push(cacheKey);
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while (cacheQueue.length > MAX_CACHE_SIZE) {
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delete signingKeyCache[cacheQueue.shift()];
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}
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let key = `AWS4${credentials.secretAccessKey}`;
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for (const signable of [shortDate, region, service, KEY_TYPE_IDENTIFIER]) {
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key = await hmac(sha256Constructor, key, signable);
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}
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return (signingKeyCache[cacheKey] = key);
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};
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const clearCredentialCache = () => {
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cacheQueue.length = 0;
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Object.keys(signingKeyCache).forEach((cacheKey) => {
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delete signingKeyCache[cacheKey];
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});
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};
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const hmac = (ctor, secret, data) => {
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const hash = new ctor(secret);
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hash.update(utilUtf8.toUint8Array(data));
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return hash.digest();
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};
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const getCanonicalHeaders = ({ headers }, unsignableHeaders, signableHeaders) => {
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const canonical = {};
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for (const headerName of Object.keys(headers).sort()) {
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if (headers[headerName] == undefined) {
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continue;
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}
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const canonicalHeaderName = headerName.toLowerCase();
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if (canonicalHeaderName in ALWAYS_UNSIGNABLE_HEADERS ||
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unsignableHeaders?.has(canonicalHeaderName) ||
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PROXY_HEADER_PATTERN.test(canonicalHeaderName) ||
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SEC_HEADER_PATTERN.test(canonicalHeaderName)) {
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if (!signableHeaders || (signableHeaders && !signableHeaders.has(canonicalHeaderName))) {
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continue;
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}
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}
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canonical[canonicalHeaderName] = headers[headerName].trim().replace(/\s+/g, " ");
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}
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return canonical;
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};
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const getPayloadHash = async ({ headers, body }, hashConstructor) => {
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for (const headerName of Object.keys(headers)) {
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if (headerName.toLowerCase() === SHA256_HEADER) {
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return headers[headerName];
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}
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}
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if (body == undefined) {
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return "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
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}
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else if (typeof body === "string" || ArrayBuffer.isView(body) || isArrayBuffer.isArrayBuffer(body)) {
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const hashCtor = new hashConstructor();
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hashCtor.update(utilUtf8.toUint8Array(body));
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return utilHexEncoding.toHex(await hashCtor.digest());
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}
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return UNSIGNED_PAYLOAD;
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};
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class HeaderFormatter {
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format(headers) {
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const chunks = [];
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for (const headerName of Object.keys(headers)) {
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const bytes = utilUtf8.fromUtf8(headerName);
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chunks.push(Uint8Array.from([bytes.byteLength]), bytes, this.formatHeaderValue(headers[headerName]));
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}
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const out = new Uint8Array(chunks.reduce((carry, bytes) => carry + bytes.byteLength, 0));
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let position = 0;
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for (const chunk of chunks) {
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out.set(chunk, position);
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position += chunk.byteLength;
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}
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return out;
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}
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formatHeaderValue(header) {
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switch (header.type) {
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case "boolean":
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return Uint8Array.from([header.value ? 0 : 1]);
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case "byte":
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return Uint8Array.from([2, header.value]);
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case "short":
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const shortView = new DataView(new ArrayBuffer(3));
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shortView.setUint8(0, 3);
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shortView.setInt16(1, header.value, false);
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return new Uint8Array(shortView.buffer);
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case "integer":
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const intView = new DataView(new ArrayBuffer(5));
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intView.setUint8(0, 4);
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intView.setInt32(1, header.value, false);
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return new Uint8Array(intView.buffer);
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case "long":
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const longBytes = new Uint8Array(9);
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longBytes[0] = 5;
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longBytes.set(header.value.bytes, 1);
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return longBytes;
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case "binary":
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const binView = new DataView(new ArrayBuffer(3 + header.value.byteLength));
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binView.setUint8(0, 6);
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binView.setUint16(1, header.value.byteLength, false);
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const binBytes = new Uint8Array(binView.buffer);
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binBytes.set(header.value, 3);
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return binBytes;
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case "string":
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const utf8Bytes = utilUtf8.fromUtf8(header.value);
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const strView = new DataView(new ArrayBuffer(3 + utf8Bytes.byteLength));
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strView.setUint8(0, 7);
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strView.setUint16(1, utf8Bytes.byteLength, false);
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const strBytes = new Uint8Array(strView.buffer);
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strBytes.set(utf8Bytes, 3);
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return strBytes;
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case "timestamp":
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const tsBytes = new Uint8Array(9);
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tsBytes[0] = 8;
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tsBytes.set(Int64.fromNumber(header.value.valueOf()).bytes, 1);
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return tsBytes;
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case "uuid":
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if (!UUID_PATTERN.test(header.value)) {
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throw new Error(`Invalid UUID received: ${header.value}`);
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}
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const uuidBytes = new Uint8Array(17);
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uuidBytes[0] = 9;
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uuidBytes.set(utilHexEncoding.fromHex(header.value.replace(/\-/g, "")), 1);
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return uuidBytes;
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}
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}
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}
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const UUID_PATTERN = /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/;
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class Int64 {
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bytes;
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constructor(bytes) {
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this.bytes = bytes;
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if (bytes.byteLength !== 8) {
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throw new Error("Int64 buffers must be exactly 8 bytes");
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}
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}
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static fromNumber(number) {
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if (number > 9_223_372_036_854_775_807 || number < -9223372036854776e3) {
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throw new Error(`${number} is too large (or, if negative, too small) to represent as an Int64`);
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}
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const bytes = new Uint8Array(8);
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for (let i = 7, remaining = Math.abs(Math.round(number)); i > -1 && remaining > 0; i--, remaining /= 256) {
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bytes[i] = remaining;
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}
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if (number < 0) {
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negate(bytes);
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}
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return new Int64(bytes);
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}
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valueOf() {
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const bytes = this.bytes.slice(0);
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const negative = bytes[0] & 0b10000000;
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if (negative) {
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negate(bytes);
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}
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return parseInt(utilHexEncoding.toHex(bytes), 16) * (negative ? -1 : 1);
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}
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toString() {
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return String(this.valueOf());
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}
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}
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function negate(bytes) {
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for (let i = 0; i < 8; i++) {
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bytes[i] ^= 0xff;
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}
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for (let i = 7; i > -1; i--) {
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bytes[i]++;
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if (bytes[i] !== 0)
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break;
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}
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}
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const hasHeader = (soughtHeader, headers) => {
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soughtHeader = soughtHeader.toLowerCase();
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for (const headerName of Object.keys(headers)) {
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if (soughtHeader === headerName.toLowerCase()) {
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return true;
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}
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}
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return false;
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};
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const moveHeadersToQuery = (request, options = {}) => {
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const { headers, query = {} } = protocolHttp.HttpRequest.clone(request);
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for (const name of Object.keys(headers)) {
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const lname = name.toLowerCase();
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if ((lname.slice(0, 6) === "x-amz-" && !options.unhoistableHeaders?.has(lname)) ||
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options.hoistableHeaders?.has(lname)) {
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query[name] = headers[name];
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delete headers[name];
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}
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}
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return {
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...request,
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headers,
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query,
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};
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};
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const prepareRequest = (request) => {
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request = protocolHttp.HttpRequest.clone(request);
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for (const headerName of Object.keys(request.headers)) {
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if (GENERATED_HEADERS.indexOf(headerName.toLowerCase()) > -1) {
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delete request.headers[headerName];
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}
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}
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return request;
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};
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const getCanonicalQuery = ({ query = {} }) => {
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const keys = [];
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const serialized = {};
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for (const key of Object.keys(query)) {
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if (key.toLowerCase() === SIGNATURE_HEADER) {
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continue;
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}
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const encodedKey = utilUriEscape.escapeUri(key);
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keys.push(encodedKey);
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const value = query[key];
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if (typeof value === "string") {
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serialized[encodedKey] = `${encodedKey}=${utilUriEscape.escapeUri(value)}`;
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}
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else if (Array.isArray(value)) {
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serialized[encodedKey] = value
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.slice(0)
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.reduce((encoded, value) => encoded.concat([`${encodedKey}=${utilUriEscape.escapeUri(value)}`]), [])
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.sort()
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.join("&");
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}
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}
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return keys
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.sort()
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.map((key) => serialized[key])
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.filter((serialized) => serialized)
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.join("&");
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};
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const iso8601 = (time) => toDate(time)
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.toISOString()
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.replace(/\.\d{3}Z$/, "Z");
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const toDate = (time) => {
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if (typeof time === "number") {
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return new Date(time * 1000);
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}
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if (typeof time === "string") {
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if (Number(time)) {
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return new Date(Number(time) * 1000);
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}
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return new Date(time);
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}
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return time;
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};
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class SignatureV4Base {
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service;
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regionProvider;
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credentialProvider;
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sha256;
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uriEscapePath;
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applyChecksum;
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constructor({ applyChecksum, credentials, region, service, sha256, uriEscapePath = true, }) {
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this.service = service;
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this.sha256 = sha256;
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this.uriEscapePath = uriEscapePath;
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this.applyChecksum = typeof applyChecksum === "boolean" ? applyChecksum : true;
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this.regionProvider = utilMiddleware.normalizeProvider(region);
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this.credentialProvider = utilMiddleware.normalizeProvider(credentials);
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}
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createCanonicalRequest(request, canonicalHeaders, payloadHash) {
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const sortedHeaders = Object.keys(canonicalHeaders).sort();
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return `${request.method}
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${this.getCanonicalPath(request)}
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${getCanonicalQuery(request)}
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${sortedHeaders.map((name) => `${name}:${canonicalHeaders[name]}`).join("\n")}
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${sortedHeaders.join(";")}
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${payloadHash}`;
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}
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async createStringToSign(longDate, credentialScope, canonicalRequest, algorithmIdentifier) {
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const hash = new this.sha256();
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hash.update(utilUtf8.toUint8Array(canonicalRequest));
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const hashedRequest = await hash.digest();
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return `${algorithmIdentifier}
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${longDate}
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${credentialScope}
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${utilHexEncoding.toHex(hashedRequest)}`;
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}
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getCanonicalPath({ path }) {
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if (this.uriEscapePath) {
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const normalizedPathSegments = [];
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for (const pathSegment of path.split("/")) {
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if (pathSegment?.length === 0)
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continue;
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if (pathSegment === ".")
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continue;
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if (pathSegment === "..") {
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normalizedPathSegments.pop();
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}
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else {
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normalizedPathSegments.push(pathSegment);
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}
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}
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const normalizedPath = `${path?.startsWith("/") ? "/" : ""}${normalizedPathSegments.join("/")}${normalizedPathSegments.length > 0 && path?.endsWith("/") ? "/" : ""}`;
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const doubleEncoded = utilUriEscape.escapeUri(normalizedPath);
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return doubleEncoded.replace(/%2F/g, "/");
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}
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return path;
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}
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validateResolvedCredentials(credentials) {
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if (typeof credentials !== "object" ||
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typeof credentials.accessKeyId !== "string" ||
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typeof credentials.secretAccessKey !== "string") {
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throw new Error("Resolved credential object is not valid");
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}
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}
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formatDate(now) {
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const longDate = iso8601(now).replace(/[\-:]/g, "");
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return {
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longDate,
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shortDate: longDate.slice(0, 8),
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};
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}
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getCanonicalHeaderList(headers) {
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return Object.keys(headers).sort().join(";");
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}
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}
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class SignatureV4 extends SignatureV4Base {
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headerFormatter = new HeaderFormatter();
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constructor({ applyChecksum, credentials, region, service, sha256, uriEscapePath = true, }) {
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super({
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applyChecksum,
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credentials,
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region,
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service,
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sha256,
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uriEscapePath,
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});
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}
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async presign(originalRequest, options = {}) {
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const { signingDate = new Date(), expiresIn = 3600, unsignableHeaders, unhoistableHeaders, signableHeaders, hoistableHeaders, signingRegion, signingService, } = options;
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const credentials = await this.credentialProvider();
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this.validateResolvedCredentials(credentials);
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const region = signingRegion ?? (await this.regionProvider());
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const { longDate, shortDate } = this.formatDate(signingDate);
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if (expiresIn > MAX_PRESIGNED_TTL) {
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return Promise.reject("Signature version 4 presigned URLs" + " must have an expiration date less than one week in" + " the future");
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}
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const scope = createScope(shortDate, region, signingService ?? this.service);
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const request = moveHeadersToQuery(prepareRequest(originalRequest), { unhoistableHeaders, hoistableHeaders });
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if (credentials.sessionToken) {
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request.query[TOKEN_QUERY_PARAM] = credentials.sessionToken;
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}
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request.query[ALGORITHM_QUERY_PARAM] = ALGORITHM_IDENTIFIER;
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request.query[CREDENTIAL_QUERY_PARAM] = `${credentials.accessKeyId}/${scope}`;
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request.query[AMZ_DATE_QUERY_PARAM] = longDate;
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request.query[EXPIRES_QUERY_PARAM] = expiresIn.toString(10);
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const canonicalHeaders = getCanonicalHeaders(request, unsignableHeaders, signableHeaders);
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request.query[SIGNED_HEADERS_QUERY_PARAM] = this.getCanonicalHeaderList(canonicalHeaders);
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request.query[SIGNATURE_QUERY_PARAM] = await this.getSignature(longDate, scope, this.getSigningKey(credentials, region, shortDate, signingService), this.createCanonicalRequest(request, canonicalHeaders, await getPayloadHash(originalRequest, this.sha256)));
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return request;
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}
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async sign(toSign, options) {
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if (typeof toSign === "string") {
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return this.signString(toSign, options);
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}
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else if (toSign.headers && toSign.payload) {
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return this.signEvent(toSign, options);
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}
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else if (toSign.message) {
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return this.signMessage(toSign, options);
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}
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else {
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return this.signRequest(toSign, options);
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}
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}
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async signEvent({ headers, payload }, { signingDate = new Date(), priorSignature, signingRegion, signingService }) {
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const region = signingRegion ?? (await this.regionProvider());
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const { shortDate, longDate } = this.formatDate(signingDate);
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const scope = createScope(shortDate, region, signingService ?? this.service);
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const hashedPayload = await getPayloadHash({ headers: {}, body: payload }, this.sha256);
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const hash = new this.sha256();
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hash.update(headers);
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const hashedHeaders = utilHexEncoding.toHex(await hash.digest());
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const stringToSign = [
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EVENT_ALGORITHM_IDENTIFIER,
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longDate,
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scope,
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priorSignature,
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hashedHeaders,
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hashedPayload,
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].join("\n");
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return this.signString(stringToSign, { signingDate, signingRegion: region, signingService });
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}
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async signMessage(signableMessage, { signingDate = new Date(), signingRegion, signingService }) {
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const promise = this.signEvent({
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headers: this.headerFormatter.format(signableMessage.message.headers),
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payload: signableMessage.message.body,
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}, {
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signingDate,
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signingRegion,
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signingService,
|
|
priorSignature: signableMessage.priorSignature,
|
|
});
|
|
return promise.then((signature) => {
|
|
return { message: signableMessage.message, signature };
|
|
});
|
|
}
|
|
async signString(stringToSign, { signingDate = new Date(), signingRegion, signingService } = {}) {
|
|
const credentials = await this.credentialProvider();
|
|
this.validateResolvedCredentials(credentials);
|
|
const region = signingRegion ?? (await this.regionProvider());
|
|
const { shortDate } = this.formatDate(signingDate);
|
|
const hash = new this.sha256(await this.getSigningKey(credentials, region, shortDate, signingService));
|
|
hash.update(utilUtf8.toUint8Array(stringToSign));
|
|
return utilHexEncoding.toHex(await hash.digest());
|
|
}
|
|
async signRequest(requestToSign, { signingDate = new Date(), signableHeaders, unsignableHeaders, signingRegion, signingService, } = {}) {
|
|
const credentials = await this.credentialProvider();
|
|
this.validateResolvedCredentials(credentials);
|
|
const region = signingRegion ?? (await this.regionProvider());
|
|
const request = prepareRequest(requestToSign);
|
|
const { longDate, shortDate } = this.formatDate(signingDate);
|
|
const scope = createScope(shortDate, region, signingService ?? this.service);
|
|
request.headers[AMZ_DATE_HEADER] = longDate;
|
|
if (credentials.sessionToken) {
|
|
request.headers[TOKEN_HEADER] = credentials.sessionToken;
|
|
}
|
|
const payloadHash = await getPayloadHash(request, this.sha256);
|
|
if (!hasHeader(SHA256_HEADER, request.headers) && this.applyChecksum) {
|
|
request.headers[SHA256_HEADER] = payloadHash;
|
|
}
|
|
const canonicalHeaders = getCanonicalHeaders(request, unsignableHeaders, signableHeaders);
|
|
const signature = await this.getSignature(longDate, scope, this.getSigningKey(credentials, region, shortDate, signingService), this.createCanonicalRequest(request, canonicalHeaders, payloadHash));
|
|
request.headers[AUTH_HEADER] =
|
|
`${ALGORITHM_IDENTIFIER} ` +
|
|
`Credential=${credentials.accessKeyId}/${scope}, ` +
|
|
`SignedHeaders=${this.getCanonicalHeaderList(canonicalHeaders)}, ` +
|
|
`Signature=${signature}`;
|
|
return request;
|
|
}
|
|
async getSignature(longDate, credentialScope, keyPromise, canonicalRequest) {
|
|
const stringToSign = await this.createStringToSign(longDate, credentialScope, canonicalRequest, ALGORITHM_IDENTIFIER);
|
|
const hash = new this.sha256(await keyPromise);
|
|
hash.update(utilUtf8.toUint8Array(stringToSign));
|
|
return utilHexEncoding.toHex(await hash.digest());
|
|
}
|
|
getSigningKey(credentials, region, shortDate, service) {
|
|
return getSigningKey(this.sha256, credentials, shortDate, region, service || this.service);
|
|
}
|
|
}
|
|
|
|
const signatureV4aContainer = {
|
|
SignatureV4a: null,
|
|
};
|
|
|
|
exports.ALGORITHM_IDENTIFIER = ALGORITHM_IDENTIFIER;
|
|
exports.ALGORITHM_IDENTIFIER_V4A = ALGORITHM_IDENTIFIER_V4A;
|
|
exports.ALGORITHM_QUERY_PARAM = ALGORITHM_QUERY_PARAM;
|
|
exports.ALWAYS_UNSIGNABLE_HEADERS = ALWAYS_UNSIGNABLE_HEADERS;
|
|
exports.AMZ_DATE_HEADER = AMZ_DATE_HEADER;
|
|
exports.AMZ_DATE_QUERY_PARAM = AMZ_DATE_QUERY_PARAM;
|
|
exports.AUTH_HEADER = AUTH_HEADER;
|
|
exports.CREDENTIAL_QUERY_PARAM = CREDENTIAL_QUERY_PARAM;
|
|
exports.DATE_HEADER = DATE_HEADER;
|
|
exports.EVENT_ALGORITHM_IDENTIFIER = EVENT_ALGORITHM_IDENTIFIER;
|
|
exports.EXPIRES_QUERY_PARAM = EXPIRES_QUERY_PARAM;
|
|
exports.GENERATED_HEADERS = GENERATED_HEADERS;
|
|
exports.HOST_HEADER = HOST_HEADER;
|
|
exports.KEY_TYPE_IDENTIFIER = KEY_TYPE_IDENTIFIER;
|
|
exports.MAX_CACHE_SIZE = MAX_CACHE_SIZE;
|
|
exports.MAX_PRESIGNED_TTL = MAX_PRESIGNED_TTL;
|
|
exports.PROXY_HEADER_PATTERN = PROXY_HEADER_PATTERN;
|
|
exports.REGION_SET_PARAM = REGION_SET_PARAM;
|
|
exports.SEC_HEADER_PATTERN = SEC_HEADER_PATTERN;
|
|
exports.SHA256_HEADER = SHA256_HEADER;
|
|
exports.SIGNATURE_HEADER = SIGNATURE_HEADER;
|
|
exports.SIGNATURE_QUERY_PARAM = SIGNATURE_QUERY_PARAM;
|
|
exports.SIGNED_HEADERS_QUERY_PARAM = SIGNED_HEADERS_QUERY_PARAM;
|
|
exports.SignatureV4 = SignatureV4;
|
|
exports.SignatureV4Base = SignatureV4Base;
|
|
exports.TOKEN_HEADER = TOKEN_HEADER;
|
|
exports.TOKEN_QUERY_PARAM = TOKEN_QUERY_PARAM;
|
|
exports.UNSIGNABLE_PATTERNS = UNSIGNABLE_PATTERNS;
|
|
exports.UNSIGNED_PAYLOAD = UNSIGNED_PAYLOAD;
|
|
exports.clearCredentialCache = clearCredentialCache;
|
|
exports.createScope = createScope;
|
|
exports.getCanonicalHeaders = getCanonicalHeaders;
|
|
exports.getCanonicalQuery = getCanonicalQuery;
|
|
exports.getPayloadHash = getPayloadHash;
|
|
exports.getSigningKey = getSigningKey;
|
|
exports.hasHeader = hasHeader;
|
|
exports.moveHeadersToQuery = moveHeadersToQuery;
|
|
exports.prepareRequest = prepareRequest;
|
|
exports.signatureV4aContainer = signatureV4aContainer;
|