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Make userapi responsible for checking access tokens (#1133)

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* Make userapi responsible for checking access tokens

There's still plenty of dependencies on account/device DBs, but this
is a start. This is a breaking change as it adds a required config
value `listen.user_api`.

* Cleanup

* Review comments and test fix
This commit is contained in:
Kegsay 2020-06-16 14:10:55 +01:00 • committed by GitHub
parent 57b7fa3db8
commit 9c77022513
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66 changed files with 421 additions and 400 deletions
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125
clientapi/auth/auth.go
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@ -18,17 +18,14 @@ package auth
import (
"context"
"crypto/rand"
"database/sql"
"encoding/base64"
"fmt"
"net/http"
"strings"
"github.com/matrix-org/dendrite/appservice/types"
"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/clientapi/userutil"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/util"
)
@ -39,7 +36,7 @@ var tokenByteLength = 32
// DeviceDatabase represents a device database.
type DeviceDatabase interface {
// Look up the device matching the given access token.
GetDeviceByAccessToken(ctx context.Context, token string) (*authtypes.Device, error)
GetDeviceByAccessToken(ctx context.Context, token string) (*api.Device, error)
}
// AccountDatabase represents an account database.
@ -48,22 +45,14 @@ type AccountDatabase interface {
GetAccountByLocalpart(ctx context.Context, localpart string) (*authtypes.Account, error)
}
// Data contains information required to authenticate a request.
type Data struct {
AccountDB AccountDatabase
DeviceDB DeviceDatabase
// AppServices is the list of all registered AS
AppServices []config.ApplicationService
}
// VerifyUserFromRequest authenticates the HTTP request,
// on success returns Device of the requester.
// Finds local user or an application service user.
// Note: For an AS user, AS dummy device is returned.
// On failure returns an JSON error response which can be sent to the client.
func VerifyUserFromRequest(
req *http.Request, data Data,
) (*authtypes.Device, *util.JSONResponse) {
req *http.Request, userAPI api.UserInternalAPI,
) (*api.Device, *util.JSONResponse) {
// Try to find the Application Service user
token, err := ExtractAccessToken(req)
if err != nil {
@ -72,105 +61,31 @@ func VerifyUserFromRequest(
JSON: jsonerror.MissingToken(err.Error()),
}
}
// Search for app service with given access_token
var appService *config.ApplicationService
for _, as := range data.AppServices {
if as.ASToken == token {
appService = &as
break
}
var res api.QueryAccessTokenResponse
err = userAPI.QueryAccessToken(req.Context(), &api.QueryAccessTokenRequest{
AccessToken: token,
AppServiceUserID: req.URL.Query().Get("user_id"),
}, &res)
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("userAPI.QueryAccessToken failed")
jsonErr := jsonerror.InternalServerError()
return nil, &jsonErr
}
if appService != nil {
// Create a dummy device for AS user
dev := authtypes.Device{
// Use AS dummy device ID
ID: types.AppServiceDeviceID,
// AS dummy device has AS's token.
AccessToken: token,
}
userID := req.URL.Query().Get("user_id")
localpart, err := userutil.ParseUsernameParam(userID, nil)
if err != nil {
return nil, &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidUsername(err.Error()),
}
}
if localpart != "" { // AS is masquerading as another user
// Verify that the user is registered
account, err := data.AccountDB.GetAccountByLocalpart(req.Context(), localpart)
// Verify that account exists & appServiceID matches
if err == nil && account.AppServiceID == appService.ID {
// Set the userID of dummy device
dev.UserID = userID
return &dev, nil
}
if res.Err != nil {
if forbidden, ok := res.Err.(*api.ErrorForbidden); ok {
return nil, &util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("Application service has not registered this user"),
JSON: jsonerror.Forbidden(forbidden.Message),
}
}
// AS is not masquerading as any user, so use AS's sender_localpart
dev.UserID = appService.SenderLocalpart
return &dev, nil
}
// Try to find local user from device database
dev, devErr := verifyAccessToken(req, data.DeviceDB)
if devErr == nil {
return dev, verifyUserParameters(req)
}
return nil, &util.JSONResponse{
Code: http.StatusUnauthorized,
JSON: jsonerror.UnknownToken("Unrecognized access token"), // nolint: misspell
}
}
// verifyUserParameters ensures that a request coming from a regular user is not
// using any query parameters reserved for an application service
func verifyUserParameters(req *http.Request) *util.JSONResponse {
if req.URL.Query().Get("ts") != "" {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.Unknown("parameter 'ts' not allowed without valid parameter 'access_token'"),
}
}
return nil
}
// verifyAccessToken verifies that an access token was supplied in the given HTTP request
// and returns the device it corresponds to. Returns resErr (an error response which can be
// sent to the client) if the token is invalid or there was a problem querying the database.
func verifyAccessToken(req *http.Request, deviceDB DeviceDatabase) (device *authtypes.Device, resErr *util.JSONResponse) {
token, err := ExtractAccessToken(req)
if err != nil {
resErr = &util.JSONResponse{
if res.Device == nil {
return nil, &util.JSONResponse{
Code: http.StatusUnauthorized,
JSON: jsonerror.MissingToken(err.Error()),
}
return
}
device, err = deviceDB.GetDeviceByAccessToken(req.Context(), token)
if err != nil {
if err == sql.ErrNoRows {
resErr = &util.JSONResponse{
Code: http.StatusUnauthorized,
JSON: jsonerror.UnknownToken("Unknown token"),
}
} else {
util.GetLogger(req.Context()).WithError(err).Error("deviceDB.GetDeviceByAccessToken failed")
jsonErr := jsonerror.InternalServerError()
resErr = &jsonErr
JSON: jsonerror.UnknownToken("Unknown token"),
}
}
return
return res.Device, nil
}
// GenerateAccessToken creates a new access token. Returns an error if failed to generate