GoToSocial/internal/api/client/auth/authorize.go

319 lines
11 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2022 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 auth
import (
"errors"
"fmt"
"net/http"
"net/url"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/google/uuid"
"github.com/superseriousbusiness/gotosocial/internal/api"
"github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
// helpfulAdvice is a handy hint to users;
// particularly important during the login flow
var helpfulAdvice = "If you arrived at this error during a login/oauth flow, please try clearing your session cookies and logging in again; if problems persist, make sure you're using the correct credentials"
// 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.
func (m *Module) AuthorizeGETHandler(c *gin.Context) {
s := sessions.Default(c)
if _, err := api.NegotiateAccept(c, api.HTMLAcceptHeaders...); err != nil {
api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
return
}
// 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(sessionUserID).(string)
if !ok || userID == "" {
form := &model.OAuthAuthorize{}
if err := c.ShouldBind(form); err != nil {
m.clearSession(s)
api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, helpfulAdvice), m.processor.InstanceGet)
return
}
if errWithCode := saveAuthFormToSession(s, form); errWithCode != nil {
m.clearSession(s)
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
c.Redirect(http.StatusSeeOther, AuthSignInPath)
return
}
// use session information to validate app, user, and account for this request
clientID, ok := s.Get(sessionClientID).(string)
if !ok || clientID == "" {
m.clearSession(s)
err := fmt.Errorf("key %s was not found in session", sessionClientID)
api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, helpfulAdvice), m.processor.InstanceGet)
return
}
app := &gtsmodel.Application{}
if err := m.db.GetWhere(c.Request.Context(), []db.Where{{Key: sessionClientID, Value: clientID}}, app); err != nil {
m.clearSession(s)
safe := fmt.Sprintf("application for %s %s could not be retrieved", sessionClientID, clientID)
var errWithCode gtserror.WithCode
if err == db.ErrNoEntries {
errWithCode = gtserror.NewErrorBadRequest(err, safe, helpfulAdvice)
} else {
errWithCode = gtserror.NewErrorInternalError(err, safe, helpfulAdvice)
}
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
user := &gtsmodel.User{}
if err := m.db.GetByID(c.Request.Context(), userID, user); err != nil {
m.clearSession(s)
safe := fmt.Sprintf("user with id %s could not be retrieved", userID)
var errWithCode gtserror.WithCode
if err == db.ErrNoEntries {
errWithCode = gtserror.NewErrorBadRequest(err, safe, helpfulAdvice)
} else {
errWithCode = gtserror.NewErrorInternalError(err, safe, helpfulAdvice)
}
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
acct, err := m.db.GetAccountByID(c.Request.Context(), user.AccountID)
if err != nil {
m.clearSession(s)
safe := fmt.Sprintf("account with id %s could not be retrieved", user.AccountID)
var errWithCode gtserror.WithCode
if err == db.ErrNoEntries {
errWithCode = gtserror.NewErrorBadRequest(err, safe, helpfulAdvice)
} else {
errWithCode = gtserror.NewErrorInternalError(err, safe, helpfulAdvice)
}
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
if ensureUserIsAuthorizedOrRedirect(c, user, acct) {
return
}
// Finally we should also get the redirect and scope of this particular request, as stored in the session.
redirect, ok := s.Get(sessionRedirectURI).(string)
if !ok || redirect == "" {
m.clearSession(s)
err := fmt.Errorf("key %s was not found in session", sessionRedirectURI)
api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, helpfulAdvice), m.processor.InstanceGet)
return
}
scope, ok := s.Get(sessionScope).(string)
if !ok || scope == "" {
m.clearSession(s)
err := fmt.Errorf("key %s was not found in session", sessionScope)
api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, helpfulAdvice), m.processor.InstanceGet)
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
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.
func (m *Module) AuthorizePOSTHandler(c *gin.Context) {
s := sessions.Default(c)
// 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.
errs := []string{}
forceLogin, ok := s.Get(sessionForceLogin).(string)
if !ok {
forceLogin = "false"
}
responseType, ok := s.Get(sessionResponseType).(string)
if !ok || responseType == "" {
errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionResponseType))
}
clientID, ok := s.Get(sessionClientID).(string)
if !ok || clientID == "" {
errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionClientID))
}
redirectURI, ok := s.Get(sessionRedirectURI).(string)
if !ok || redirectURI == "" {
errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionRedirectURI))
}
scope, ok := s.Get(sessionScope).(string)
if !ok {
errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionScope))
}
userID, ok := s.Get(sessionUserID).(string)
if !ok {
errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionUserID))
}
if len(errs) != 0 {
errs = append(errs, helpfulAdvice)
api.ErrorHandler(c, gtserror.NewErrorBadRequest(errors.New("one or more missing keys on session during AuthorizePOSTHandler"), errs...), m.processor.InstanceGet)
return
}
user := &gtsmodel.User{}
if err := m.db.GetByID(c.Request.Context(), userID, user); err != nil {
m.clearSession(s)
safe := fmt.Sprintf("user with id %s could not be retrieved", userID)
var errWithCode gtserror.WithCode
if err == db.ErrNoEntries {
errWithCode = gtserror.NewErrorBadRequest(err, safe, helpfulAdvice)
} else {
errWithCode = gtserror.NewErrorInternalError(err, safe, helpfulAdvice)
}
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
acct, err := m.db.GetAccountByID(c.Request.Context(), user.AccountID)
if err != nil {
m.clearSession(s)
safe := fmt.Sprintf("account with id %s could not be retrieved", user.AccountID)
var errWithCode gtserror.WithCode
if err == db.ErrNoEntries {
errWithCode = gtserror.NewErrorBadRequest(err, safe, helpfulAdvice)
} else {
errWithCode = gtserror.NewErrorInternalError(err, safe, helpfulAdvice)
}
api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
return
}
if ensureUserIsAuthorizedOrRedirect(c, user, acct) {
return
}
// we're done with the session now, so just clear it out
m.clearSession(s)
// we have to set the values on the request form
// so that they're picked up by the oauth server
c.Request.Form = url.Values{
sessionForceLogin: {forceLogin},
sessionResponseType: {responseType},
sessionClientID: {clientID},
sessionRedirectURI: {redirectURI},
sessionScope: {scope},
sessionUserID: {userID},
}
if err := m.processor.OAuthHandleAuthorizeRequest(c.Writer, c.Request); err != nil {
api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error(), helpfulAdvice), m.processor.InstanceGet)
}
}
// saveAuthFormToSession checks the given OAuthAuthorize form,
// and stores the values in the form into the session.
func saveAuthFormToSession(s sessions.Session, form *model.OAuthAuthorize) gtserror.WithCode {
if form == nil {
err := errors.New("OAuthAuthorize form was nil")
return gtserror.NewErrorBadRequest(err, err.Error(), helpfulAdvice)
}
if form.ResponseType == "" {
err := errors.New("field response_type was not set on OAuthAuthorize form")
return gtserror.NewErrorBadRequest(err, err.Error(), helpfulAdvice)
}
if form.ClientID == "" {
err := errors.New("field client_id was not set on OAuthAuthorize form")
return gtserror.NewErrorBadRequest(err, err.Error(), helpfulAdvice)
}
if form.RedirectURI == "" {
err := errors.New("field redirect_uri was not set on OAuthAuthorize form")
return gtserror.NewErrorBadRequest(err, err.Error(), helpfulAdvice)
}
// 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(sessionForceLogin, form.ForceLogin)
s.Set(sessionResponseType, form.ResponseType)
s.Set(sessionClientID, form.ClientID)
s.Set(sessionRedirectURI, form.RedirectURI)
s.Set(sessionScope, form.Scope)
s.Set(sessionState, uuid.NewString())
if err := s.Save(); err != nil {
err := fmt.Errorf("error saving form values onto session: %s", err)
return gtserror.NewErrorInternalError(err, helpfulAdvice)
}
return nil
}
func ensureUserIsAuthorizedOrRedirect(ctx *gin.Context, user *gtsmodel.User, account *gtsmodel.Account) (redirected bool) {
if user.ConfirmedAt.IsZero() {
ctx.Redirect(http.StatusSeeOther, CheckYourEmailPath)
redirected = true
return
}
if !user.Approved {
ctx.Redirect(http.StatusSeeOther, WaitForApprovalPath)
redirected = true
return
}
if user.Disabled || !account.SuspendedAt.IsZero() {
ctx.Redirect(http.StatusSeeOther, AccountDisabledPath)
redirected = true
return
}
return
}