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lots of restructuring

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tsmethurst 2021-03-22 22:23:42 +01:00
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internal/oauth/oauth.go
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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package oauth
import (
"fmt"
"net/http"
"net/url"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/go-pg/pg/v10"
"github.com/google/uuid"
"github.com/gotosocial/gotosocial/internal/api"
"github.com/gotosocial/gotosocial/internal/gtsmodel"
"github.com/gotosocial/gotosocial/pkg/mastotypes"
"github.com/gotosocial/oauth2/v4"
"github.com/gotosocial/oauth2/v4/errors"
"github.com/gotosocial/oauth2/v4/manage"
"github.com/gotosocial/oauth2/v4/server"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/bcrypt"
)
const (
outOfBandRedirect = "urn:ietf:wg:oauth:2.0:oob"
appsPath = "/api/v1/apps"
authSignInPath = "/auth/sign_in"
oauthTokenPath = "/oauth/token"
oauthAuthorizePath = "/oauth/authorize"
)
type API struct {
manager *manage.Manager
server *server.Server
conn *pg.DB
log *logrus.Logger
}
type login struct {
Email string `form:"username"`
Password string `form:"password"`
}
type code struct {
Code string `form:"code"`
}
func New(ts oauth2.TokenStore, cs oauth2.ClientStore, conn *pg.DB, log *logrus.Logger) *API {
manager := manage.NewDefaultManager()
manager.MapTokenStorage(ts)
manager.MapClientStorage(cs)
manager.SetAuthorizeCodeTokenCfg(manage.DefaultAuthorizeCodeTokenCfg)
sc := &server.Config{
TokenType: "Bearer",
// Must follow the spec.
AllowGetAccessRequest: false,
// Support only the non-implicit flow.
AllowedResponseTypes: []oauth2.ResponseType{oauth2.Code},
// Allow:
// - Authorization Code (for first & third parties)
AllowedGrantTypes: []oauth2.GrantType{
oauth2.AuthorizationCode,
},
AllowedCodeChallengeMethods: []oauth2.CodeChallengeMethod{oauth2.CodeChallengePlain},
}
srv := server.NewServer(sc, manager)
srv.SetInternalErrorHandler(func(err error) *errors.Response {
log.Errorf("internal oauth error: %s", err)
return nil
})
srv.SetResponseErrorHandler(func(re *errors.Response) {
log.Errorf("internal response error: %s", re.Error)
})
api := &API{
manager: manager,
server: srv,
conn: conn,
log: log,
}
api.server.SetUserAuthorizationHandler(api.userAuthorizationHandler)
api.server.SetClientInfoHandler(server.ClientFormHandler)
return api
}
func (a *API) Route(s api.Server) error {
s.AttachHandler(http.MethodPost, appsPath, a.appsPOSTHandler)
s.AttachHandler(http.MethodGet, authSignInPath, a.signInGETHandler)
s.AttachHandler(http.MethodPost, authSignInPath, a.signInPOSTHandler)
s.AttachHandler(http.MethodPost, oauthTokenPath, a.tokenPOSTHandler)
s.AttachHandler(http.MethodGet, oauthAuthorizePath, a.authorizeGETHandler)
s.AttachHandler(http.MethodPost, oauthAuthorizePath, a.authorizePOSTHandler)
s.AttachMiddleware(a.oauthTokenMiddleware)
return nil
}
/*
MAIN HANDLERS -- serve these through a server/router
*/
// appsPOSTHandler should be served at https://example.org/api/v1/apps
// It is equivalent to: https://docs.joinmastodon.org/methods/apps/
func (a *API) appsPOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "AppsPOSTHandler")
l.Trace("entering AppsPOSTHandler")
form := &mastotypes.ApplicationPOSTRequest{}
if err := c.ShouldBind(form); err != nil {
c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
return
}
// permitted length for most fields
permittedLength := 64
// redirect can be a bit bigger because we probably need to encode data in the redirect uri
permittedRedirect := 256
// check lengths of fields before proceeding so the user can't spam huge entries into the database
if len(form.ClientName) > permittedLength {
c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("client_name must be less than %d bytes", permittedLength)})
return
}
if len(form.Website) > permittedLength {
c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("website must be less than %d bytes", permittedLength)})
return
}
if len(form.RedirectURIs) > permittedRedirect {
c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("redirect_uris must be less than %d bytes", permittedRedirect)})
return
}
if len(form.Scopes) > permittedLength {
c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("scopes must be less than %d bytes", permittedLength)})
return
}
// set default 'read' for scopes if it's not set, this follows the default of the mastodon api https://docs.joinmastodon.org/methods/apps/
var scopes string
if form.Scopes == "" {
scopes = "read"
} else {
scopes = form.Scopes
}
// generate new IDs for this application and its associated client
clientID := uuid.NewString()
clientSecret := uuid.NewString()
vapidKey := uuid.NewString()
// generate the application to put in the database
app := &gtsmodel.Application{
Name: form.ClientName,
Website: form.Website,
RedirectURI: form.RedirectURIs,
ClientID: clientID,
ClientSecret: clientSecret,
Scopes: scopes,
VapidKey: vapidKey,
}
// chuck it in the db
if _, err := a.conn.Model(app).Insert(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
// now we need to model an oauth client from the application that the oauth library can use
oc := &oauthClient{
ID: clientID,
Secret: clientSecret,
Domain: form.RedirectURIs,
UserID: "", // This client isn't yet associated with a specific user, it's just an app client right now
}
// chuck it in the db
if _, err := a.conn.Model(oc).Insert(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
// done, return the new app information per the spec here: https://docs.joinmastodon.org/methods/apps/
c.JSON(http.StatusOK, app.ToMastotype())
}
// signInGETHandler should be served at https://example.org/auth/sign_in.
// The idea is to present a sign in page to the user, where they can enter their username and password.
// The form will then POST to the sign in page, which will be handled by SignInPOSTHandler
func (a *API) signInGETHandler(c *gin.Context) {
a.log.WithField("func", "SignInGETHandler").Trace("serving sign in html")
c.HTML(http.StatusOK, "sign-in.tmpl", gin.H{})
}
// signInPOSTHandler should be served at https://example.org/auth/sign_in.
// The idea is to present a sign in page to the user, where they can enter their username and password.
// The handler will then redirect to the auth handler served at /auth
func (a *API) signInPOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "SignInPOSTHandler")
s := sessions.Default(c)
form := &login{}
if err := c.ShouldBind(form); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
l.Tracef("parsed form: %+v", form)
userid, err := a.validatePassword(form.Email, form.Password)
if err != nil {
c.String(http.StatusForbidden, err.Error())
return
}
s.Set("userid", userid)
if err := s.Save(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
l.Trace("redirecting to auth page")
c.Redirect(http.StatusFound, oauthAuthorizePath)
}
// tokenPOSTHandler should be served as a POST at https://example.org/oauth/token
// The idea here is to serve an oauth access token to a user, which can be used for authorizing against non-public APIs.
// See https://docs.joinmastodon.org/methods/apps/oauth/#obtain-a-token
func (a *API) tokenPOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "TokenPOSTHandler")
l.Trace("entered TokenPOSTHandler")
if err := a.server.HandleTokenRequest(c.Writer, c.Request); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
}
}
// authorizeGETHandler should be served as GET at https://example.org/oauth/authorize
// The idea here is to present an oauth authorize page to the user, with a button
// that they have to click to accept. See here: https://docs.joinmastodon.org/methods/apps/oauth/#authorize-a-user
func (a *API) authorizeGETHandler(c *gin.Context) {
l := a.log.WithField("func", "AuthorizeGETHandler")
s := sessions.Default(c)
// UserID will be set in the session by AuthorizePOSTHandler if the caller has already gone through the authentication flow
// If it's not set, then we don't know yet who the user is, so we need to redirect them to the sign in page.
userID, ok := s.Get("userid").(string)
if !ok || userID == "" {
l.Trace("userid was empty, parsing form then redirecting to sign in page")
if err := parseAuthForm(c, l); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
} else {
c.Redirect(http.StatusFound, authSignInPath)
}
return
}
// We can use the client_id on the session to retrieve info about the app associated with the client_id
clientID, ok := s.Get("client_id").(string)
if !ok || clientID == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no client_id found in session"})
return
}
app := &gtsmodel.Application{
ClientID: clientID,
}
if err := a.conn.Model(app).Where("client_id = ?", app.ClientID).Select(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("no application found for client id %s", clientID)})
return
}
// we can also use the userid of the user to fetch their username from the db to greet them nicely <3
user := &gtsmodel.User{
ID: userID,
}
if err := a.conn.Model(user).Where("id = ?", user.ID).Select(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
acct := &gtsmodel.Account{
ID: user.AccountID,
}
if err := a.conn.Model(acct).Where("id = ?", acct.ID).Select(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
// Finally we should also get the redirect and scope of this particular request, as stored in the session.
redirect, ok := s.Get("redirect_uri").(string)
if !ok || redirect == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no redirect_uri found in session"})
return
}
scope, ok := s.Get("scope").(string)
if !ok || scope == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no scope found in session"})
return
}
// the authorize template will display a form to the user where they can get some information
// about the app that's trying to authorize, and the scope of the request.
// They can then approve it if it looks OK to them, which will POST to the AuthorizePOSTHandler
l.Trace("serving authorize html")
c.HTML(http.StatusOK, "authorize.tmpl", gin.H{
"appname": app.Name,
"appwebsite": app.Website,
"redirect": redirect,
"scope": scope,
"user": acct.Username,
})
}
// authorizePOSTHandler should be served as POST at https://example.org/oauth/authorize
// At this point we assume that the user has A) logged in and B) accepted that the app should act for them,
// so we should proceed with the authentication flow and generate an oauth token for them if we can.
// See here: https://docs.joinmastodon.org/methods/apps/oauth/#authorize-a-user
func (a *API) authorizePOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "AuthorizePOSTHandler")
s := sessions.Default(c)
// At this point we know the user has said 'yes' to allowing the application and oauth client
// work for them, so we can set the
// We need to retrieve the original form submitted to the authorizeGEThandler, and
// recreate it on the request so that it can be used further by the oauth2 library.
// So first fetch all the values from the session.
forceLogin, ok := s.Get("force_login").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing force_login"})
return
}
responseType, ok := s.Get("response_type").(string)
if !ok || responseType == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing response_type"})
return
}
clientID, ok := s.Get("client_id").(string)
if !ok || clientID == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing client_id"})
return
}
redirectURI, ok := s.Get("redirect_uri").(string)
if !ok || redirectURI == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing redirect_uri"})
return
}
scope, ok := s.Get("scope").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing scope"})
return
}
userID, ok := s.Get("userid").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing userid"})
return
}
// we're done with the session so we can clear it now
s.Clear()
// now set the values on the request
values := url.Values{}
values.Set("force_login", forceLogin)
values.Set("response_type", responseType)
values.Set("client_id", clientID)
values.Set("redirect_uri", redirectURI)
values.Set("scope", scope)
values.Set("userid", userID)
c.Request.Form = values
l.Tracef("values on request set to %+v", c.Request.Form)
// and proceed with authorization using the oauth2 library
if err := a.server.HandleAuthorizeRequest(c.Writer, c.Request); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
}
}
/*
MIDDLEWARE
*/
// oauthTokenMiddleware
func (a *API) oauthTokenMiddleware(c *gin.Context) {
l := a.log.WithField("func", "ValidatePassword")
l.Trace("entering OauthTokenMiddleware")
if ti, err := a.server.ValidationBearerToken(c.Request); err == nil {
l.Tracef("authenticated user %s with bearer token, scope is %s", ti.GetUserID(), ti.GetScope())
c.Set("authenticated_user", ti.GetUserID())
} else {
l.Trace("continuing with unauthenticated request")
}
}
/*
SUB-HANDLERS -- don't serve these directly, they should be attached to the oauth2 server or used inside handler funcs
*/
// validatePassword takes an email address and a password.
// The goal is to authenticate the password against the one for that email
// address stored in the database. If OK, we return the userid (a uuid) for that user,
// so that it can be used in further Oauth flows to generate a token/retreieve an oauth client from the db.
func (a *API) validatePassword(email string, password string) (userid string, err error) {
l := a.log.WithField("func", "ValidatePassword")
// make sure an email/password was provided and bail if not
if email == "" || password == "" {
l.Debug("email or password was not provided")
return incorrectPassword()
}
// first we select the user from the database based on email address, bail if no user found for that email
gtsUser := &gtsmodel.User{}
if err := a.conn.Model(gtsUser).Where("email = ?", email).Select(); err != nil {
l.Debugf("user %s was not retrievable from db during oauth authorization attempt: %s", email, err)
return incorrectPassword()
}
// make sure a password is actually set and bail if not
if gtsUser.EncryptedPassword == "" {
l.Warnf("encrypted password for user %s was empty for some reason", gtsUser.Email)
return incorrectPassword()
}
// compare the provided password with the encrypted one from the db, bail if they don't match
if err := bcrypt.CompareHashAndPassword([]byte(gtsUser.EncryptedPassword), []byte(password)); err != nil {
l.Debugf("password hash didn't match for user %s during login attempt: %s", gtsUser.Email, err)
return incorrectPassword()
}
// If we've made it this far the email/password is correct, so we can just return the id of the user.
userid = gtsUser.ID
l.Tracef("returning (%s, %s)", userid, err)
return
}
// incorrectPassword is just a little helper function to use in the ValidatePassword function
func incorrectPassword() (string, error) {
return "", errors.New("password/email combination was incorrect")
}
// userAuthorizationHandler gets the user's ID from the 'userid' field of the request form,
// or redirects to the /auth/sign_in page, if this key is not present.
func (a *API) userAuthorizationHandler(w http.ResponseWriter, r *http.Request) (userID string, err error) {
l := a.log.WithField("func", "UserAuthorizationHandler")
userID = r.FormValue("userid")
if userID == "" {
return "", errors.New("userid was empty, redirecting to sign in page")
}
l.Tracef("returning userID %s", userID)
return userID, err
}
// parseAuthForm parses the OAuthAuthorize form in the gin context, and stores
// the values in the form into the session.
func parseAuthForm(c *gin.Context, l *logrus.Entry) error {
s := sessions.Default(c)
// first make sure they've filled out the authorize form with the required values
form := &mastotypes.OAuthAuthorize{}
if err := c.ShouldBind(form); err != nil {
return err
}
l.Tracef("parsed form: %+v", form)
// these fields are *required* so check 'em
if form.ResponseType == "" || form.ClientID == "" || form.RedirectURI == "" {
return errors.New("missing one of: response_type, client_id or redirect_uri")
}
// set default scope to read
if form.Scope == "" {
form.Scope = "read"
}
// save these values from the form so we can use them elsewhere in the session
s.Set("force_login", form.ForceLogin)
s.Set("response_type", form.ResponseType)
s.Set("client_id", form.ClientID)
s.Set("redirect_uri", form.RedirectURI)
s.Set("scope", form.Scope)
return s.Save()
}