mirror of
https://github.com/1f349/dendrite.git
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246 lines
8.3 KiB
Go
246 lines
8.3 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package auth
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import (
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"context"
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"encoding/json"
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"net/http"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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"github.com/tidwall/gjson"
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)
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// Type represents an auth type
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// https://matrix.org/docs/spec/client_server/r0.6.1#authentication-types
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type Type interface {
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// Name returns the name of the auth type e.g `m.login.password`
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Name() string
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// Login with the auth type, returning an error response on failure.
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// Not all types support login, only m.login.password and m.login.token
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// See https://matrix.org/docs/spec/client_server/r0.6.1#post-matrix-client-r0-login
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// This function will be called when doing login and when doing 'sudo' style
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// actions e.g deleting devices. The response must be a 401 as per:
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// "If the homeserver decides that an attempt on a stage was unsuccessful, but the
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// client may make a second attempt, it returns the same HTTP status 401 response as above,
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// with the addition of the standard errcode and error fields describing the error."
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//
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// The returned cleanup function must be non-nil on success, and will be called after
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// authorization has been completed. Its argument is the final result of authorization.
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LoginFromJSON(ctx context.Context, reqBytes []byte) (login *Login, cleanup LoginCleanupFunc, errRes *util.JSONResponse)
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// TODO: Extend to support Register() flow
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// Register(ctx context.Context, sessionID string, req interface{})
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}
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type LoginCleanupFunc func(context.Context, *util.JSONResponse)
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// LoginIdentifier represents identifier types
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// https://matrix.org/docs/spec/client_server/r0.6.1#identifier-types
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type LoginIdentifier struct {
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Type string `json:"type"`
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// when type = m.id.user
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User string `json:"user"`
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// when type = m.id.thirdparty
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Medium string `json:"medium"`
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Address string `json:"address"`
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}
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// Login represents the shared fields used in all forms of login/sudo endpoints.
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type Login struct {
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LoginIdentifier // Flat fields deprecated in favour of `identifier`.
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Identifier LoginIdentifier `json:"identifier"`
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// Both DeviceID and InitialDisplayName can be omitted, or empty strings ("")
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// Thus a pointer is needed to differentiate between the two
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InitialDisplayName *string `json:"initial_device_display_name"`
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DeviceID *string `json:"device_id"`
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}
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// Username returns the user localpart/user_id in this request, if it exists.
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func (r *Login) Username() string {
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if r.Identifier.Type == "m.id.user" {
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return r.Identifier.User
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}
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// deprecated but without it Element iOS won't log in
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return r.User
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}
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// ThirdPartyID returns the 3PID medium and address for this login, if it exists.
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func (r *Login) ThirdPartyID() (medium, address string) {
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if r.Identifier.Type == "m.id.thirdparty" {
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return r.Identifier.Medium, r.Identifier.Address
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}
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// deprecated
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if r.Medium == "email" {
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return "email", r.Address
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}
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return "", ""
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}
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type userInteractiveFlow struct {
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Stages []string `json:"stages"`
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}
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// UserInteractive checks that the user is who they claim to be, via a UI auth.
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// This is used for things like device deletion and password reset where
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// the user already has a valid access token, but we want to double-check
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// that it isn't stolen by re-authenticating them.
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type UserInteractive struct {
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Flows []userInteractiveFlow
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// Map of login type to implementation
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Types map[string]Type
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// Map of session ID to completed login types, will need to be extended in future
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Sessions map[string][]string
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}
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func NewUserInteractive(userAccountAPI api.UserLoginAPI, cfg *config.ClientAPI) *UserInteractive {
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typePassword := &LoginTypePassword{
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GetAccountByPassword: userAccountAPI.QueryAccountByPassword,
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Config: cfg,
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}
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return &UserInteractive{
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Flows: []userInteractiveFlow{
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{
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Stages: []string{typePassword.Name()},
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},
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},
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Types: map[string]Type{
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typePassword.Name(): typePassword,
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},
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Sessions: make(map[string][]string),
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}
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}
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func (u *UserInteractive) IsSingleStageFlow(authType string) bool {
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for _, f := range u.Flows {
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if len(f.Stages) == 1 && f.Stages[0] == authType {
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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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func (u *UserInteractive) AddCompletedStage(sessionID, authType string) {
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// TODO: Handle multi-stage flows
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delete(u.Sessions, sessionID)
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}
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type Challenge struct {
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Completed []string `json:"completed"`
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Flows []userInteractiveFlow `json:"flows"`
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Session string `json:"session"`
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// TODO: Return any additional `params`
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Params map[string]interface{} `json:"params"`
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}
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// Challenge returns an HTTP 401 with the supported flows for authenticating
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func (u *UserInteractive) Challenge(sessionID string) *util.JSONResponse {
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return &util.JSONResponse{
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Code: 401,
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JSON: Challenge{
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Completed: u.Sessions[sessionID],
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Flows: u.Flows,
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Session: sessionID,
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Params: make(map[string]interface{}),
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},
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}
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}
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// NewSession returns a challenge with a new session ID and remembers the session ID
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func (u *UserInteractive) NewSession() *util.JSONResponse {
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sessionID, err := GenerateAccessToken()
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if err != nil {
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logrus.WithError(err).Error("failed to generate session ID")
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res := jsonerror.InternalServerError()
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return &res
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}
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u.Sessions[sessionID] = []string{}
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return u.Challenge(sessionID)
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}
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// ResponseWithChallenge mixes together a JSON body (e.g an error with errcode/message) with the
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// standard challenge response.
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func (u *UserInteractive) ResponseWithChallenge(sessionID string, response interface{}) *util.JSONResponse {
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mixedObjects := make(map[string]interface{})
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b, err := json.Marshal(response)
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if err != nil {
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ise := jsonerror.InternalServerError()
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return &ise
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}
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_ = json.Unmarshal(b, &mixedObjects)
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challenge := u.Challenge(sessionID)
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b, err = json.Marshal(challenge.JSON)
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if err != nil {
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ise := jsonerror.InternalServerError()
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return &ise
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}
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_ = json.Unmarshal(b, &mixedObjects)
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return &util.JSONResponse{
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Code: 401,
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JSON: mixedObjects,
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}
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}
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// Verify returns an error/challenge response to send to the client, or nil if the user is authenticated.
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// `bodyBytes` is the HTTP request body which must contain an `auth` key.
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// Returns the login that was verified for additional checks if required.
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func (u *UserInteractive) Verify(ctx context.Context, bodyBytes []byte, device *api.Device) (*Login, *util.JSONResponse) {
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// TODO: rate limit
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// "A client should first make a request with no auth parameter. The homeserver returns an HTTP 401 response, with a JSON body"
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// https://matrix.org/docs/spec/client_server/r0.6.1#user-interactive-api-in-the-rest-api
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hasResponse := gjson.GetBytes(bodyBytes, "auth").Exists()
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if !hasResponse {
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return nil, u.NewSession()
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}
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// extract the type so we know which login type to use
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authType := gjson.GetBytes(bodyBytes, "auth.type").Str
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loginType, ok := u.Types[authType]
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if !ok {
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return nil, &util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("Unknown auth.type: " + authType),
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}
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}
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// retrieve the session
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sessionID := gjson.GetBytes(bodyBytes, "auth.session").Str
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if _, ok = u.Sessions[sessionID]; !ok {
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// if the login type is part of a single stage flow then allow them to omit the session ID
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if !u.IsSingleStageFlow(authType) {
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return nil, &util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.Unknown("The auth.session is missing or unknown."),
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}
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}
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}
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login, cleanup, resErr := loginType.LoginFromJSON(ctx, []byte(gjson.GetBytes(bodyBytes, "auth").Raw))
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if resErr != nil {
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return nil, u.ResponseWithChallenge(sessionID, resErr.JSON)
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}
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u.AddCompletedStage(sessionID, authType)
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cleanup(ctx, nil)
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// TODO: Check if there's more stages to go and return an error
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return login, nil
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}
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