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220 lines
5.4 KiB
220 lines
5.4 KiB
// Copyright 2018 Joyent, Inc.
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module.exports = Fingerprint;
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var assert = require('assert-plus');
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var Buffer = require('safer-buffer').Buffer;
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var algs = require('./algs');
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var crypto = require('crypto');
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var errs = require('./errors');
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var Key = require('./key');
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var PrivateKey = require('./private-key');
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var Certificate = require('./certificate');
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var utils = require('./utils');
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var FingerprintFormatError = errs.FingerprintFormatError;
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var InvalidAlgorithmError = errs.InvalidAlgorithmError;
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function Fingerprint(opts) {
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assert.object(opts, 'options');
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assert.string(opts.type, 'options.type');
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assert.buffer(opts.hash, 'options.hash');
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assert.string(opts.algorithm, 'options.algorithm');
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this.algorithm = opts.algorithm.toLowerCase();
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if (algs.hashAlgs[this.algorithm] !== true)
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throw (new InvalidAlgorithmError(this.algorithm));
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this.hash = opts.hash;
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this.type = opts.type;
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this.hashType = opts.hashType;
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}
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Fingerprint.prototype.toString = function (format) {
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if (format === undefined) {
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if (this.algorithm === 'md5' || this.hashType === 'spki')
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format = 'hex';
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else
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format = 'base64';
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}
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assert.string(format);
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switch (format) {
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case 'hex':
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if (this.hashType === 'spki')
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return (this.hash.toString('hex'));
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return (addColons(this.hash.toString('hex')));
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case 'base64':
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if (this.hashType === 'spki')
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return (this.hash.toString('base64'));
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return (sshBase64Format(this.algorithm,
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this.hash.toString('base64')));
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default:
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throw (new FingerprintFormatError(undefined, format));
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}
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};
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Fingerprint.prototype.matches = function (other) {
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assert.object(other, 'key or certificate');
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if (this.type === 'key' && this.hashType !== 'ssh') {
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utils.assertCompatible(other, Key, [1, 7], 'key with spki');
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if (PrivateKey.isPrivateKey(other)) {
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utils.assertCompatible(other, PrivateKey, [1, 6],
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'privatekey with spki support');
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}
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} else if (this.type === 'key') {
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utils.assertCompatible(other, Key, [1, 0], 'key');
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} else {
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utils.assertCompatible(other, Certificate, [1, 0],
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'certificate');
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}
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var theirHash = other.hash(this.algorithm, this.hashType);
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var theirHash2 = crypto.createHash(this.algorithm).
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update(theirHash).digest('base64');
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if (this.hash2 === undefined)
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this.hash2 = crypto.createHash(this.algorithm).
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update(this.hash).digest('base64');
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return (this.hash2 === theirHash2);
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};
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/*JSSTYLED*/
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var base64RE = /^[A-Za-z0-9+\/=]+$/;
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/*JSSTYLED*/
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var hexRE = /^[a-fA-F0-9]+$/;
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Fingerprint.parse = function (fp, options) {
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assert.string(fp, 'fingerprint');
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var alg, hash, enAlgs;
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if (Array.isArray(options)) {
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enAlgs = options;
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options = {};
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}
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assert.optionalObject(options, 'options');
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if (options === undefined)
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options = {};
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if (options.enAlgs !== undefined)
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enAlgs = options.enAlgs;
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if (options.algorithms !== undefined)
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enAlgs = options.algorithms;
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assert.optionalArrayOfString(enAlgs, 'algorithms');
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var hashType = 'ssh';
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if (options.hashType !== undefined)
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hashType = options.hashType;
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assert.string(hashType, 'options.hashType');
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var parts = fp.split(':');
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if (parts.length == 2) {
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alg = parts[0].toLowerCase();
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if (!base64RE.test(parts[1]))
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throw (new FingerprintFormatError(fp));
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try {
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hash = Buffer.from(parts[1], 'base64');
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} catch (e) {
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throw (new FingerprintFormatError(fp));
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}
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} else if (parts.length > 2) {
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alg = 'md5';
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if (parts[0].toLowerCase() === 'md5')
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parts = parts.slice(1);
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parts = parts.map(function (p) {
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while (p.length < 2)
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p = '0' + p;
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if (p.length > 2)
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throw (new FingerprintFormatError(fp));
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return (p);
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});
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parts = parts.join('');
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if (!hexRE.test(parts) || parts.length % 2 !== 0)
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throw (new FingerprintFormatError(fp));
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try {
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hash = Buffer.from(parts, 'hex');
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} catch (e) {
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throw (new FingerprintFormatError(fp));
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}
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} else {
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if (hexRE.test(fp)) {
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hash = Buffer.from(fp, 'hex');
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} else if (base64RE.test(fp)) {
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hash = Buffer.from(fp, 'base64');
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} else {
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throw (new FingerprintFormatError(fp));
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}
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switch (hash.length) {
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case 32:
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alg = 'sha256';
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break;
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case 16:
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alg = 'md5';
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break;
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case 20:
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alg = 'sha1';
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break;
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case 64:
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alg = 'sha512';
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break;
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default:
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throw (new FingerprintFormatError(fp));
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}
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/* Plain hex/base64: guess it's probably SPKI unless told. */
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if (options.hashType === undefined)
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hashType = 'spki';
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}
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if (alg === undefined)
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throw (new FingerprintFormatError(fp));
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if (algs.hashAlgs[alg] === undefined)
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throw (new InvalidAlgorithmError(alg));
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if (enAlgs !== undefined) {
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enAlgs = enAlgs.map(function (a) { return a.toLowerCase(); });
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if (enAlgs.indexOf(alg) === -1)
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throw (new InvalidAlgorithmError(alg));
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}
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return (new Fingerprint({
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algorithm: alg,
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hash: hash,
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type: options.type || 'key',
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hashType: hashType
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}));
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};
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function addColons(s) {
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/*JSSTYLED*/
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return (s.replace(/(.{2})(?=.)/g, '$1:'));
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}
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function base64Strip(s) {
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/*JSSTYLED*/
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return (s.replace(/=*$/, ''));
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}
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function sshBase64Format(alg, h) {
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return (alg.toUpperCase() + ':' + base64Strip(h));
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}
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Fingerprint.isFingerprint = function (obj, ver) {
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return (utils.isCompatible(obj, Fingerprint, ver));
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};
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/*
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* API versions for Fingerprint:
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* [1,0] -- initial ver
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* [1,1] -- first tagged ver
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* [1,2] -- hashType and spki support
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*/
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Fingerprint.prototype._sshpkApiVersion = [1, 2];
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Fingerprint._oldVersionDetect = function (obj) {
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assert.func(obj.toString);
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assert.func(obj.matches);
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return ([1, 0]);
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};
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