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eric sciple 2020-01-24 12:22:34 -05:00
parent 9fff29ba6c
commit 00c3b50fca
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29
node_modules/http-signature/lib/index.js generated vendored
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// Copyright 2015 Joyent, Inc.
var parser = require('./parser');
var signer = require('./signer');
var verify = require('./verify');
var utils = require('./utils');
///--- API
module.exports = {
parse: parser.parseRequest,
parseRequest: parser.parseRequest,
sign: signer.signRequest,
signRequest: signer.signRequest,
createSigner: signer.createSigner,
isSigner: signer.isSigner,
sshKeyToPEM: utils.sshKeyToPEM,
sshKeyFingerprint: utils.fingerprint,
pemToRsaSSHKey: utils.pemToRsaSSHKey,
verify: verify.verifySignature,
verifySignature: verify.verifySignature,
verifyHMAC: verify.verifyHMAC
};

315
node_modules/http-signature/lib/parser.js generated vendored
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// Copyright 2012 Joyent, Inc. All rights reserved.
var assert = require('assert-plus');
var util = require('util');
var utils = require('./utils');
///--- Globals
var HASH_ALGOS = utils.HASH_ALGOS;
var PK_ALGOS = utils.PK_ALGOS;
var HttpSignatureError = utils.HttpSignatureError;
var InvalidAlgorithmError = utils.InvalidAlgorithmError;
var validateAlgorithm = utils.validateAlgorithm;
var State = {
New: 0,
Params: 1
};
var ParamsState = {
Name: 0,
Quote: 1,
Value: 2,
Comma: 3
};
///--- Specific Errors
function ExpiredRequestError(message) {
HttpSignatureError.call(this, message, ExpiredRequestError);
}
util.inherits(ExpiredRequestError, HttpSignatureError);
function InvalidHeaderError(message) {
HttpSignatureError.call(this, message, InvalidHeaderError);
}
util.inherits(InvalidHeaderError, HttpSignatureError);
function InvalidParamsError(message) {
HttpSignatureError.call(this, message, InvalidParamsError);
}
util.inherits(InvalidParamsError, HttpSignatureError);
function MissingHeaderError(message) {
HttpSignatureError.call(this, message, MissingHeaderError);
}
util.inherits(MissingHeaderError, HttpSignatureError);
function StrictParsingError(message) {
HttpSignatureError.call(this, message, StrictParsingError);
}
util.inherits(StrictParsingError, HttpSignatureError);
///--- Exported API
module.exports = {
/**
* Parses the 'Authorization' header out of an http.ServerRequest object.
*
* Note that this API will fully validate the Authorization header, and throw
* on any error. It will not however check the signature, or the keyId format
* as those are specific to your environment. You can use the options object
* to pass in extra constraints.
*
* As a response object you can expect this:
*
* {
* "scheme": "Signature",
* "params": {
* "keyId": "foo",
* "algorithm": "rsa-sha256",
* "headers": [
* "date" or "x-date",
* "digest"
* ],
* "signature": "base64"
* },
* "signingString": "ready to be passed to crypto.verify()"
* }
*
* @param {Object} request an http.ServerRequest.
* @param {Object} options an optional options object with:
* - clockSkew: allowed clock skew in seconds (default 300).
* - headers: required header names (def: date or x-date)
* - algorithms: algorithms to support (default: all).
* - strict: should enforce latest spec parsing
* (default: false).
* @return {Object} parsed out object (see above).
* @throws {TypeError} on invalid input.
* @throws {InvalidHeaderError} on an invalid Authorization header error.
* @throws {InvalidParamsError} if the params in the scheme are invalid.
* @throws {MissingHeaderError} if the params indicate a header not present,
* either in the request headers from the params,
* or not in the params from a required header
* in options.
* @throws {StrictParsingError} if old attributes are used in strict parsing
* mode.
* @throws {ExpiredRequestError} if the value of date or x-date exceeds skew.
*/
parseRequest: function parseRequest(request, options) {
assert.object(request, 'request');
assert.object(request.headers, 'request.headers');
if (options === undefined) {
options = {};
}
if (options.headers === undefined) {
options.headers = [request.headers['x-date'] ? 'x-date' : 'date'];
}
assert.object(options, 'options');
assert.arrayOfString(options.headers, 'options.headers');
assert.optionalFinite(options.clockSkew, 'options.clockSkew');
var authzHeaderName = options.authorizationHeaderName || 'authorization';
if (!request.headers[authzHeaderName]) {
throw new MissingHeaderError('no ' + authzHeaderName + ' header ' +
'present in the request');
}
options.clockSkew = options.clockSkew || 300;
var i = 0;
var state = State.New;
var substate = ParamsState.Name;
var tmpName = '';
var tmpValue = '';
var parsed = {
scheme: '',
params: {},
signingString: ''
};
var authz = request.headers[authzHeaderName];
for (i = 0; i < authz.length; i++) {
var c = authz.charAt(i);
switch (Number(state)) {
case State.New:
if (c !== ' ') parsed.scheme += c;
else state = State.Params;
break;
case State.Params:
switch (Number(substate)) {
case ParamsState.Name:
var code = c.charCodeAt(0);
// restricted name of A-Z / a-z
if ((code >= 0x41 && code <= 0x5a) || // A-Z
(code >= 0x61 && code <= 0x7a)) { // a-z
tmpName += c;
} else if (c === '=') {
if (tmpName.length === 0)
throw new InvalidHeaderError('bad param format');
substate = ParamsState.Quote;
} else {
throw new InvalidHeaderError('bad param format');
}
break;
case ParamsState.Quote:
if (c === '"') {
tmpValue = '';
substate = ParamsState.Value;
} else {
throw new InvalidHeaderError('bad param format');
}
break;
case ParamsState.Value:
if (c === '"') {
parsed.params[tmpName] = tmpValue;
substate = ParamsState.Comma;
} else {
tmpValue += c;
}
break;
case ParamsState.Comma:
if (c === ',') {
tmpName = '';
substate = ParamsState.Name;
} else {
throw new InvalidHeaderError('bad param format');
}
break;
default:
throw new Error('Invalid substate');
}
break;
default:
throw new Error('Invalid substate');
}
}
if (!parsed.params.headers || parsed.params.headers === '') {
if (request.headers['x-date']) {
parsed.params.headers = ['x-date'];
} else {
parsed.params.headers = ['date'];
}
} else {
parsed.params.headers = parsed.params.headers.split(' ');
}
// Minimally validate the parsed object
if (!parsed.scheme || parsed.scheme !== 'Signature')
throw new InvalidHeaderError('scheme was not "Signature"');
if (!parsed.params.keyId)
throw new InvalidHeaderError('keyId was not specified');
if (!parsed.params.algorithm)
throw new InvalidHeaderError('algorithm was not specified');
if (!parsed.params.signature)
throw new InvalidHeaderError('signature was not specified');
// Check the algorithm against the official list
parsed.params.algorithm = parsed.params.algorithm.toLowerCase();
try {
validateAlgorithm(parsed.params.algorithm);
} catch (e) {
if (e instanceof InvalidAlgorithmError)
throw (new InvalidParamsError(parsed.params.algorithm + ' is not ' +
'supported'));
else
throw (e);
}
// Build the signingString
for (i = 0; i < parsed.params.headers.length; i++) {
var h = parsed.params.headers[i].toLowerCase();
parsed.params.headers[i] = h;
if (h === 'request-line') {
if (!options.strict) {
/*
* We allow headers from the older spec drafts if strict parsing isn't
* specified in options.
*/
parsed.signingString +=
request.method + ' ' + request.url + ' HTTP/' + request.httpVersion;
} else {
/* Strict parsing doesn't allow older draft headers. */
throw (new StrictParsingError('request-line is not a valid header ' +
'with strict parsing enabled.'));
}
} else if (h === '(request-target)') {
parsed.signingString +=
'(request-target): ' + request.method.toLowerCase() + ' ' +
request.url;
} else {
var value = request.headers[h];
if (value === undefined)
throw new MissingHeaderError(h + ' was not in the request');
parsed.signingString += h + ': ' + value;
}
if ((i + 1) < parsed.params.headers.length)
parsed.signingString += '\n';
}
// Check against the constraints
var date;
if (request.headers.date || request.headers['x-date']) {
if (request.headers['x-date']) {
date = new Date(request.headers['x-date']);
} else {
date = new Date(request.headers.date);
}
var now = new Date();
var skew = Math.abs(now.getTime() - date.getTime());
if (skew > options.clockSkew * 1000) {
throw new ExpiredRequestError('clock skew of ' +
(skew / 1000) +
's was greater than ' +
options.clockSkew + 's');
}
}
options.headers.forEach(function (hdr) {
// Remember that we already checked any headers in the params
// were in the request, so if this passes we're good.
if (parsed.params.headers.indexOf(hdr.toLowerCase()) < 0)
throw new MissingHeaderError(hdr + ' was not a signed header');
});
if (options.algorithms) {
if (options.algorithms.indexOf(parsed.params.algorithm) === -1)
throw new InvalidParamsError(parsed.params.algorithm +
' is not a supported algorithm');
}
parsed.algorithm = parsed.params.algorithm.toUpperCase();
parsed.keyId = parsed.params.keyId;
return parsed;
}
};

401
node_modules/http-signature/lib/signer.js generated vendored
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// Copyright 2012 Joyent, Inc. All rights reserved.
var assert = require('assert-plus');
var crypto = require('crypto');
var http = require('http');
var util = require('util');
var sshpk = require('sshpk');
var jsprim = require('jsprim');
var utils = require('./utils');
var sprintf = require('util').format;
var HASH_ALGOS = utils.HASH_ALGOS;
var PK_ALGOS = utils.PK_ALGOS;
var InvalidAlgorithmError = utils.InvalidAlgorithmError;
var HttpSignatureError = utils.HttpSignatureError;
var validateAlgorithm = utils.validateAlgorithm;
///--- Globals
var AUTHZ_FMT =
'Signature keyId="%s",algorithm="%s",headers="%s",signature="%s"';
///--- Specific Errors
function MissingHeaderError(message) {
HttpSignatureError.call(this, message, MissingHeaderError);
}
util.inherits(MissingHeaderError, HttpSignatureError);
function StrictParsingError(message) {
HttpSignatureError.call(this, message, StrictParsingError);
}
util.inherits(StrictParsingError, HttpSignatureError);
/* See createSigner() */
function RequestSigner(options) {
assert.object(options, 'options');
var alg = [];
if (options.algorithm !== undefined) {
assert.string(options.algorithm, 'options.algorithm');
alg = validateAlgorithm(options.algorithm);
}
this.rs_alg = alg;
/*
* RequestSigners come in two varieties: ones with an rs_signFunc, and ones
* with an rs_signer.
*
* rs_signFunc-based RequestSigners have to build up their entire signing
* string within the rs_lines array and give it to rs_signFunc as a single
* concat'd blob. rs_signer-based RequestSigners can add a line at a time to
* their signing state by using rs_signer.update(), thus only needing to
* buffer the hash function state and one line at a time.
*/
if (options.sign !== undefined) {
assert.func(options.sign, 'options.sign');
this.rs_signFunc = options.sign;
} else if (alg[0] === 'hmac' && options.key !== undefined) {
assert.string(options.keyId, 'options.keyId');
this.rs_keyId = options.keyId;
if (typeof (options.key) !== 'string' && !Buffer.isBuffer(options.key))
throw (new TypeError('options.key for HMAC must be a string or Buffer'));
/*
* Make an rs_signer for HMACs, not a rs_signFunc -- HMACs digest their
* data in chunks rather than requiring it all to be given in one go
* at the end, so they are more similar to signers than signFuncs.
*/
this.rs_signer = crypto.createHmac(alg[1].toUpperCase(), options.key);
this.rs_signer.sign = function () {
var digest = this.digest('base64');
return ({
hashAlgorithm: alg[1],
toString: function () { return (digest); }
});
};
} else if (options.key !== undefined) {
var key = options.key;
if (typeof (key) === 'string' || Buffer.isBuffer(key))
key = sshpk.parsePrivateKey(key);
assert.ok(sshpk.PrivateKey.isPrivateKey(key, [1, 2]),
'options.key must be a sshpk.PrivateKey');
this.rs_key = key;
assert.string(options.keyId, 'options.keyId');
this.rs_keyId = options.keyId;
if (!PK_ALGOS[key.type]) {
throw (new InvalidAlgorithmError(key.type.toUpperCase() + ' type ' +
'keys are not supported'));
}
if (alg[0] !== undefined && key.type !== alg[0]) {
throw (new InvalidAlgorithmError('options.key must be a ' +
alg[0].toUpperCase() + ' key, was given a ' +
key.type.toUpperCase() + ' key instead'));
}
this.rs_signer = key.createSign(alg[1]);
} else {
throw (new TypeError('options.sign (func) or options.key is required'));
}
this.rs_headers = [];
this.rs_lines = [];
}
/**
* Adds a header to be signed, with its value, into this signer.
*
* @param {String} header
* @param {String} value
* @return {String} value written
*/
RequestSigner.prototype.writeHeader = function (header, value) {
assert.string(header, 'header');
header = header.toLowerCase();
assert.string(value, 'value');
this.rs_headers.push(header);
if (this.rs_signFunc) {
this.rs_lines.push(header + ': ' + value);
} else {
var line = header + ': ' + value;
if (this.rs_headers.length > 0)
line = '\n' + line;
this.rs_signer.update(line);
}
return (value);
};
/**
* Adds a default Date header, returning its value.
*
* @return {String}
*/
RequestSigner.prototype.writeDateHeader = function () {
return (this.writeHeader('date', jsprim.rfc1123(new Date())));
};
/**
* Adds the request target line to be signed.
*
* @param {String} method, HTTP method (e.g. 'get', 'post', 'put')
* @param {String} path
*/
RequestSigner.prototype.writeTarget = function (method, path) {
assert.string(method, 'method');
assert.string(path, 'path');
method = method.toLowerCase();
this.writeHeader('(request-target)', method + ' ' + path);
};
/**
* Calculate the value for the Authorization header on this request
* asynchronously.
*
* @param {Func} callback (err, authz)
*/
RequestSigner.prototype.sign = function (cb) {
assert.func(cb, 'callback');
if (this.rs_headers.length < 1)
throw (new Error('At least one header must be signed'));
var alg, authz;
if (this.rs_signFunc) {
var data = this.rs_lines.join('\n');
var self = this;
this.rs_signFunc(data, function (err, sig) {
if (err) {
cb(err);
return;
}
try {
assert.object(sig, 'signature');
assert.string(sig.keyId, 'signature.keyId');
assert.string(sig.algorithm, 'signature.algorithm');
assert.string(sig.signature, 'signature.signature');
alg = validateAlgorithm(sig.algorithm);
authz = sprintf(AUTHZ_FMT,
sig.keyId,
sig.algorithm,
self.rs_headers.join(' '),
sig.signature);
} catch (e) {
cb(e);
return;
}
cb(null, authz);
});
} else {
try {
var sigObj = this.rs_signer.sign();
} catch (e) {
cb(e);
return;
}
alg = (this.rs_alg[0] || this.rs_key.type) + '-' + sigObj.hashAlgorithm;
var signature = sigObj.toString();
authz = sprintf(AUTHZ_FMT,
this.rs_keyId,
alg,
this.rs_headers.join(' '),
signature);
cb(null, authz);
}
};
///--- Exported API
module.exports = {
/**
* Identifies whether a given object is a request signer or not.
*
* @param {Object} object, the object to identify
* @returns {Boolean}
*/
isSigner: function (obj) {
if (typeof (obj) === 'object' && obj instanceof RequestSigner)
return (true);
return (false);
},
/**
* Creates a request signer, used to asynchronously build a signature
* for a request (does not have to be an http.ClientRequest).
*
* @param {Object} options, either:
* - {String} keyId
* - {String|Buffer} key
* - {String} algorithm (optional, required for HMAC)
* or:
* - {Func} sign (data, cb)
* @return {RequestSigner}
*/
createSigner: function createSigner(options) {
return (new RequestSigner(options));
},
/**
* Adds an 'Authorization' header to an http.ClientRequest object.
*
* Note that this API will add a Date header if it's not already set. Any
* other headers in the options.headers array MUST be present, or this
* will throw.
*
* You shouldn't need to check the return type; it's just there if you want
* to be pedantic.
*
* The optional flag indicates whether parsing should use strict enforcement
* of the version draft-cavage-http-signatures-04 of the spec or beyond.
* The default is to be loose and support
* older versions for compatibility.
*
* @param {Object} request an instance of http.ClientRequest.
* @param {Object} options signing parameters object:
* - {String} keyId required.
* - {String} key required (either a PEM or HMAC key).
* - {Array} headers optional; defaults to ['date'].
* - {String} algorithm optional (unless key is HMAC);
* default is the same as the sshpk default
* signing algorithm for the type of key given
* - {String} httpVersion optional; defaults to '1.1'.
* - {Boolean} strict optional; defaults to 'false'.
* @return {Boolean} true if Authorization (and optionally Date) were added.
* @throws {TypeError} on bad parameter types (input).
* @throws {InvalidAlgorithmError} if algorithm was bad or incompatible with
* the given key.
* @throws {sshpk.KeyParseError} if key was bad.
* @throws {MissingHeaderError} if a header to be signed was specified but
* was not present.
*/
signRequest: function signRequest(request, options) {
assert.object(request, 'request');
assert.object(options, 'options');
assert.optionalString(options.algorithm, 'options.algorithm');
assert.string(options.keyId, 'options.keyId');
assert.optionalArrayOfString(options.headers, 'options.headers');
assert.optionalString(options.httpVersion, 'options.httpVersion');
if (!request.getHeader('Date'))
request.setHeader('Date', jsprim.rfc1123(new Date()));
if (!options.headers)
options.headers = ['date'];
if (!options.httpVersion)
options.httpVersion = '1.1';
var alg = [];
if (options.algorithm) {
options.algorithm = options.algorithm.toLowerCase();
alg = validateAlgorithm(options.algorithm);
}
var i;
var stringToSign = '';
for (i = 0; i < options.headers.length; i++) {
if (typeof (options.headers[i]) !== 'string')
throw new TypeError('options.headers must be an array of Strings');
var h = options.headers[i].toLowerCase();
if (h === 'request-line') {
if (!options.strict) {
/**
* We allow headers from the older spec drafts if strict parsing isn't
* specified in options.
*/
stringToSign +=
request.method + ' ' + request.path + ' HTTP/' +
options.httpVersion;
} else {
/* Strict parsing doesn't allow older draft headers. */
throw (new StrictParsingError('request-line is not a valid header ' +
'with strict parsing enabled.'));
}
} else if (h === '(request-target)') {
stringToSign +=
'(request-target): ' + request.method.toLowerCase() + ' ' +
request.path;
} else {
var value = request.getHeader(h);
if (value === undefined || value === '') {
throw new MissingHeaderError(h + ' was not in the request');
}
stringToSign += h + ': ' + value;
}
if ((i + 1) < options.headers.length)
stringToSign += '\n';
}
/* This is just for unit tests. */
if (request.hasOwnProperty('_stringToSign')) {
request._stringToSign = stringToSign;
}
var signature;
if (alg[0] === 'hmac') {
if (typeof (options.key) !== 'string' && !Buffer.isBuffer(options.key))
throw (new TypeError('options.key must be a string or Buffer'));
var hmac = crypto.createHmac(alg[1].toUpperCase(), options.key);
hmac.update(stringToSign);
signature = hmac.digest('base64');
} else {
var key = options.key;
if (typeof (key) === 'string' || Buffer.isBuffer(key))
key = sshpk.parsePrivateKey(options.key);
assert.ok(sshpk.PrivateKey.isPrivateKey(key, [1, 2]),
'options.key must be a sshpk.PrivateKey');
if (!PK_ALGOS[key.type]) {
throw (new InvalidAlgorithmError(key.type.toUpperCase() + ' type ' +
'keys are not supported'));
}
if (alg[0] !== undefined && key.type !== alg[0]) {
throw (new InvalidAlgorithmError('options.key must be a ' +
alg[0].toUpperCase() + ' key, was given a ' +
key.type.toUpperCase() + ' key instead'));
}
var signer = key.createSign(alg[1]);
signer.update(stringToSign);
var sigObj = signer.sign();
if (!HASH_ALGOS[sigObj.hashAlgorithm]) {
throw (new InvalidAlgorithmError(sigObj.hashAlgorithm.toUpperCase() +
' is not a supported hash algorithm'));
}
options.algorithm = key.type + '-' + sigObj.hashAlgorithm;
signature = sigObj.toString();
assert.notStrictEqual(signature, '', 'empty signature produced');
}
var authzHeaderName = options.authorizationHeaderName || 'Authorization';
request.setHeader(authzHeaderName, sprintf(AUTHZ_FMT,
options.keyId,
options.algorithm,
options.headers.join(' '),
signature));
return true;
}
};

112
node_modules/http-signature/lib/utils.js generated vendored
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// Copyright 2012 Joyent, Inc. All rights reserved.
var assert = require('assert-plus');
var sshpk = require('sshpk');
var util = require('util');
var HASH_ALGOS = {
'sha1': true,
'sha256': true,
'sha512': true
};
var PK_ALGOS = {
'rsa': true,
'dsa': true,
'ecdsa': true
};
function HttpSignatureError(message, caller) {
if (Error.captureStackTrace)
Error.captureStackTrace(this, caller || HttpSignatureError);
this.message = message;
this.name = caller.name;
}
util.inherits(HttpSignatureError, Error);
function InvalidAlgorithmError(message) {
HttpSignatureError.call(this, message, InvalidAlgorithmError);
}
util.inherits(InvalidAlgorithmError, HttpSignatureError);
function validateAlgorithm(algorithm) {
var alg = algorithm.toLowerCase().split('-');
if (alg.length !== 2) {
throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' is not a ' +
'valid algorithm'));
}
if (alg[0] !== 'hmac' && !PK_ALGOS[alg[0]]) {
throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' type keys ' +
'are not supported'));
}
if (!HASH_ALGOS[alg[1]]) {
throw (new InvalidAlgorithmError(alg[1].toUpperCase() + ' is not a ' +
'supported hash algorithm'));
}
return (alg);
}
///--- API
module.exports = {
HASH_ALGOS: HASH_ALGOS,
PK_ALGOS: PK_ALGOS,
HttpSignatureError: HttpSignatureError,
InvalidAlgorithmError: InvalidAlgorithmError,
validateAlgorithm: validateAlgorithm,
/**
* Converts an OpenSSH public key (rsa only) to a PKCS#8 PEM file.
*
* The intent of this module is to interoperate with OpenSSL only,
* specifically the node crypto module's `verify` method.
*
* @param {String} key an OpenSSH public key.
* @return {String} PEM encoded form of the RSA public key.
* @throws {TypeError} on bad input.
* @throws {Error} on invalid ssh key formatted data.
*/
sshKeyToPEM: function sshKeyToPEM(key) {
assert.string(key, 'ssh_key');
var k = sshpk.parseKey(key, 'ssh');
return (k.toString('pem'));
},
/**
* Generates an OpenSSH fingerprint from an ssh public key.
*
* @param {String} key an OpenSSH public key.
* @return {String} key fingerprint.
* @throws {TypeError} on bad input.
* @throws {Error} if what you passed doesn't look like an ssh public key.
*/
fingerprint: function fingerprint(key) {
assert.string(key, 'ssh_key');
var k = sshpk.parseKey(key, 'ssh');
return (k.fingerprint('md5').toString('hex'));
},
/**
* Converts a PKGCS#8 PEM file to an OpenSSH public key (rsa)
*
* The reverse of the above function.
*/
pemToRsaSSHKey: function pemToRsaSSHKey(pem, comment) {
assert.equal('string', typeof (pem), 'typeof pem');
var k = sshpk.parseKey(pem, 'pem');
k.comment = comment;
return (k.toString('ssh'));
}
};

88
node_modules/http-signature/lib/verify.js generated vendored
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// Copyright 2015 Joyent, Inc.
var assert = require('assert-plus');
var crypto = require('crypto');
var sshpk = require('sshpk');
var utils = require('./utils');
var HASH_ALGOS = utils.HASH_ALGOS;
var PK_ALGOS = utils.PK_ALGOS;
var InvalidAlgorithmError = utils.InvalidAlgorithmError;
var HttpSignatureError = utils.HttpSignatureError;
var validateAlgorithm = utils.validateAlgorithm;
///--- Exported API
module.exports = {
/**
* Verify RSA/DSA signature against public key. You are expected to pass in
* an object that was returned from `parse()`.
*
* @param {Object} parsedSignature the object you got from `parse`.
* @param {String} pubkey RSA/DSA private key PEM.
* @return {Boolean} true if valid, false otherwise.
* @throws {TypeError} if you pass in bad arguments.
* @throws {InvalidAlgorithmError}
*/
verifySignature: function verifySignature(parsedSignature, pubkey) {
assert.object(parsedSignature, 'parsedSignature');
if (typeof (pubkey) === 'string' || Buffer.isBuffer(pubkey))
pubkey = sshpk.parseKey(pubkey);
assert.ok(sshpk.Key.isKey(pubkey, [1, 1]), 'pubkey must be a sshpk.Key');
var alg = validateAlgorithm(parsedSignature.algorithm);
if (alg[0] === 'hmac' || alg[0] !== pubkey.type)
return (false);
var v = pubkey.createVerify(alg[1]);
v.update(parsedSignature.signingString);
return (v.verify(parsedSignature.params.signature, 'base64'));
},
/**
* Verify HMAC against shared secret. You are expected to pass in an object
* that was returned from `parse()`.
*
* @param {Object} parsedSignature the object you got from `parse`.
* @param {String} secret HMAC shared secret.
* @return {Boolean} true if valid, false otherwise.
* @throws {TypeError} if you pass in bad arguments.
* @throws {InvalidAlgorithmError}
*/
verifyHMAC: function verifyHMAC(parsedSignature, secret) {
assert.object(parsedSignature, 'parsedHMAC');
assert.string(secret, 'secret');
var alg = validateAlgorithm(parsedSignature.algorithm);
if (alg[0] !== 'hmac')
return (false);
var hashAlg = alg[1].toUpperCase();
var hmac = crypto.createHmac(hashAlg, secret);
hmac.update(parsedSignature.signingString);
/*
* Now double-hash to avoid leaking timing information - there's
* no easy constant-time compare in JS, so we use this approach
* instead. See for more info:
* https://www.isecpartners.com/blog/2011/february/double-hmac-
* verification.aspx
*/
var h1 = crypto.createHmac(hashAlg, secret);
h1.update(hmac.digest());
h1 = h1.digest();
var h2 = crypto.createHmac(hashAlg, secret);
h2.update(new Buffer(parsedSignature.params.signature, 'base64'));
h2 = h2.digest();
/* Node 0.8 returns strings from .digest(). */
if (typeof (h1) === 'string')
return (h1 === h2);
/* And node 0.10 lacks the .equals() method on Buffers. */
if (Buffer.isBuffer(h1) && !h1.equals)
return (h1.toString('binary') === h2.toString('binary'));
return (h1.equals(h2));
}
};