Example #1
0
func unwrapError(err error) error {
	code := grpc.Code(err)
	errBody := grpc.ErrorDesc(err)
	switch code {
	case InternalServerError:
		return core.InternalServerError(errBody)
	case NotSupportedError:
		return core.NotSupportedError(errBody)
	case MalformedRequestError:
		return core.MalformedRequestError(errBody)
	case UnauthorizedError:
		return core.UnauthorizedError(errBody)
	case NotFoundError:
		return core.NotFoundError(errBody)
	case SignatureValidationError:
		return core.SignatureValidationError(errBody)
	case NoSuchRegistrationError:
		return core.NoSuchRegistrationError(errBody)
	case RateLimitedError:
		return core.RateLimitedError(errBody)
	case LengthRequiredError:
		return core.LengthRequiredError(errBody)
	case BadNonceError:
		return core.BadNonceError(errBody)
	default:
		return err
	}
}
Example #2
0
func TestErrors(t *testing.T) {
	testcases := []struct {
		err          error
		expectedCode codes.Code
	}{
		{core.MalformedRequestError("test 1"), MalformedRequestError},
		{core.NotSupportedError("test 2"), NotSupportedError},
		{core.UnauthorizedError("test 3"), UnauthorizedError},
		{core.NotFoundError("test 4"), NotFoundError},
		{core.LengthRequiredError("test 5"), LengthRequiredError},
		{core.SignatureValidationError("test 6"), SignatureValidationError},
		{core.RateLimitedError("test 7"), RateLimitedError},
		{core.BadNonceError("test 8"), BadNonceError},
		{core.NoSuchRegistrationError("test 9"), NoSuchRegistrationError},
		{core.InternalServerError("test 10"), InternalServerError},
	}

	for _, tc := range testcases {
		wrappedErr := wrapError(tc.err)
		test.AssertEquals(t, grpc.Code(wrappedErr), tc.expectedCode)
		test.AssertEquals(t, tc.err, unwrapError(wrappedErr))
	}
}
Example #3
0
// verifyPOST reads and parses the request body, looks up the Registration
// corresponding to its JWK, verifies the JWS signature, checks that the
// resource field is present and correct in the JWS protected header, and
// returns the JWS payload bytes, the key used to verify, and the corresponding
// Registration (or error).  If regCheck is false, verifyPOST will still try to
// look up a registration object, and will return it if found. However, if no
// registration object is found, verifyPOST will attempt to verify the JWS using
// the key in the JWS headers, and return the key plus a dummy registration if
// successful. If a caller passes regCheck = false, it should plan on validating
// the key itself.  verifyPOST also appends its errors to requestEvent.Errors so
// code calling it does not need to if they imediately return a response to the
// user.
func (wfe *WebFrontEndImpl) verifyPOST(logEvent *requestEvent, request *http.Request, regCheck bool, resource core.AcmeResource) ([]byte, *jose.JsonWebKey, core.Registration, error) {
	var err error
	// TODO: We should return a pointer to a registration, which can be nil,
	// rather the a registration value with a sentinel value.
	// https://github.com/letsencrypt/boulder/issues/877
	reg := core.Registration{ID: 0}

	if _, ok := request.Header["Content-Length"]; !ok {
		err = core.LengthRequiredError("Content-Length header is required for POST.")
		wfe.stats.Inc("WFE.HTTP.ClientErrors.LengthRequiredError", 1, 1.0)
		logEvent.AddError("missing Content-Length header on POST")
		return nil, nil, reg, err
	}

	// Read body
	if request.Body == nil {
		err = core.MalformedRequestError("No body on POST")
		wfe.stats.Inc("WFE.Errors.NoPOSTBody", 1, 1.0)
		logEvent.AddError("no body on POST")
		return nil, nil, reg, err
	}

	bodyBytes, err := ioutil.ReadAll(request.Body)
	if err != nil {
		err = core.InternalServerError("unable to read request body")
		wfe.stats.Inc("WFE.Errors.UnableToReadRequestBody", 1, 1.0)
		logEvent.AddError("unable to read request body")
		return nil, nil, reg, err
	}

	body := string(bodyBytes)
	// Parse as JWS
	parsedJws, err := jose.ParseSigned(body)
	if err != nil {
		puberr := core.SignatureValidationError("Parse error reading JWS")
		wfe.stats.Inc("WFE.Errors.UnableToParseJWS", 1, 1.0)
		logEvent.AddError("could not JSON parse body into JWS: %s", err)
		return nil, nil, reg, puberr
	}

	// Verify JWS
	// NOTE: It might seem insecure for the WFE to be trusted to verify
	// client requests, i.e., that the verification should be done at the
	// RA.  However the WFE is the RA's only view of the outside world
	// *anyway*, so it could always lie about what key was used by faking
	// the signature itself.
	if len(parsedJws.Signatures) > 1 {
		err = core.SignatureValidationError("Too many signatures in POST body")
		wfe.stats.Inc("WFE.Errors.TooManyJWSSignaturesInPOST", 1, 1.0)
		logEvent.AddError("too many signatures in POST body: %d", len(parsedJws.Signatures))
		return nil, nil, reg, err
	}
	if len(parsedJws.Signatures) == 0 {
		err = core.SignatureValidationError("POST JWS not signed")
		wfe.stats.Inc("WFE.Errors.JWSNotSignedInPOST", 1, 1.0)
		logEvent.AddError("no signatures in POST body")
		return nil, nil, reg, err
	}

	submittedKey := parsedJws.Signatures[0].Header.JsonWebKey
	if submittedKey == nil {
		err = core.SignatureValidationError("No JWK in JWS header")
		wfe.stats.Inc("WFE.Errors.NoJWKInJWSSignatureHeader", 1, 1.0)
		logEvent.AddError("no JWK in JWS signature header in POST body")
		return nil, nil, reg, err
	}

	var key *jose.JsonWebKey
	reg, err = wfe.SA.GetRegistrationByKey(*submittedKey)
	// Special case: If no registration was found, but regCheck is false, use an
	// empty registration and the submitted key. The caller is expected to do some
	// validation on the returned key.
	if _, ok := err.(core.NoSuchRegistrationError); ok && !regCheck {
		// When looking up keys from the registrations DB, we can be confident they
		// are "good". But when we are verifying against any submitted key, we want
		// to check its quality before doing the verify.
		if err = core.GoodKey(submittedKey.Key); err != nil {
			wfe.stats.Inc("WFE.Errors.JWKRejectedByGoodKey", 1, 1.0)
			logEvent.AddError("JWK in request was rejected by GoodKey: %s", err)
			return nil, nil, reg, err
		}
		key = submittedKey
	} else if err != nil {
		// For all other errors, or if regCheck is true, return error immediately.
		wfe.stats.Inc("WFE.Errors.UnableToGetRegistrationByKey", 1, 1.0)
		logEvent.AddError("unable to fetch registration by the given JWK: %s", err)
		return nil, nil, reg, err
	} else {
		// If the lookup was successful, use that key.
		key = &reg.Key
		logEvent.Requester = reg.ID
		logEvent.Contacts = reg.Contact
	}

	if statName, err := checkAlgorithm(key, parsedJws); err != nil {
		wfe.stats.Inc(statName, 1, 1.0)
		return nil, nil, reg, err
	}

	payload, err := parsedJws.Verify(key)
	if err != nil {
		puberr := core.SignatureValidationError("JWS verification error")
		wfe.stats.Inc("WFE.Errors.JWSVerificationFailed", 1, 1.0)
		n := len(body)
		if n > 100 {
			n = 100
		}
		logEvent.AddError("verification of JWS with the JWK failed: %v; body: %s", err, body[:n])
		return nil, nil, reg, puberr
	}

	// Check that the request has a known anti-replay nonce
	nonce := parsedJws.Signatures[0].Header.Nonce
	if err != nil || len(nonce) == 0 {
		wfe.stats.Inc("WFE.Errors.JWSMissingNonce", 1, 1.0)
		logEvent.AddError("JWS is missing an anti-replay nonce")
		err = core.BadNonceError("JWS has no anti-replay nonce")
		return nil, nil, reg, err
	} else if !wfe.nonceService.Valid(nonce) {
		wfe.stats.Inc("WFE.Errors.JWSInvalidNonce", 1, 1.0)
		logEvent.AddError("JWS has an invalid anti-replay nonce")
		err = core.BadNonceError(fmt.Sprintf("JWS has invalid anti-replay nonce"))
		return nil, nil, reg, err
	}

	// Check that the "resource" field is present and has the correct value
	var parsedRequest struct {
		Resource string `json:"resource"`
	}
	err = json.Unmarshal([]byte(payload), &parsedRequest)
	if err != nil {
		wfe.stats.Inc("WFE.Errors.UnparsableJWSPayload", 1, 1.0)
		logEvent.AddError("unable to JSON parse resource from JWS payload: %s", err)
		puberr := core.SignatureValidationError("Request payload did not parse as JSON")
		return nil, nil, reg, puberr
	}
	if parsedRequest.Resource == "" {
		wfe.stats.Inc("WFE.Errors.NoResourceInJWSPayload", 1, 1.0)
		logEvent.AddError("JWS request payload does not specifiy a resource")
		err = core.MalformedRequestError("Request payload does not specify a resource")
		return nil, nil, reg, err
	} else if resource != core.AcmeResource(parsedRequest.Resource) {
		wfe.stats.Inc("WFE.Errors.MismatchedResourceInJWSPayload", 1, 1.0)
		logEvent.AddError("JWS request payload does not match resource")
		err = core.MalformedRequestError(fmt.Sprintf("JWS resource payload does not match the HTTP resource: %s != %s", parsedRequest.Resource, resource))
		return nil, nil, reg, err
	}

	return []byte(payload), key, reg, nil
}