Fix.

node_modules/http-signature/lib/parser.js

@@ -0,0 +1,315 @@
+// 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;
+  }
+
+};