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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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 (
"context"
"errors"
"fmt"
"net/http"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
"golang.org/x/crypto/bcrypt"
)
// login just wraps a form-submitted username (we want an email) and password
type login struct {
Email string `form:"username"`
Password string `form:"password"`
}
// 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.
// If an idp provider is set, then the user will be redirected to that to do their sign in.
func (m *Module) SignInGETHandler(c *gin.Context) {
if _, err := apiutil.NegotiateAccept(c, apiutil.HTMLAcceptHeaders...); err != nil {
apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
return
}
if !config.GetOIDCEnabled() {
instance, errWithCode := m.processor.InstanceGetV1(c.Request.Context())
if errWithCode != nil {
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
// no idp provider, use our own funky little sign in page
c.HTML(http.StatusOK, "sign-in.tmpl", gin.H{
"instance": instance,
})
return
}
// idp provider is in use, so redirect to it
s := sessions.Default(c)
internalStateI := s.Get(sessionInternalState)
internalState, ok := internalStateI.(string)
if !ok {
m.clearSession(s)
err := fmt.Errorf("key %s was not found in session", sessionInternalState)
apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
return
}
c.Redirect(http.StatusSeeOther, m.idp.AuthCodeURL(internalState))
}
// 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 (m *Module) SignInPOSTHandler(c *gin.Context) {
s := sessions.Default(c)
form := &login{}
if err := c.ShouldBind(form); err != nil {
m.clearSession(s)
apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, oauth.HelpfulAdvice), m.processor.InstanceGetV1)
return
}
userid, errWithCode := m.ValidatePassword(c.Request.Context(), form.Email, form.Password)
if errWithCode != nil {
// don't clear session here, so the user can just press back and try again
// if they accidentally gave the wrong password or something
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
s.Set(sessionUserID, userid)
if err := s.Save(); err != nil {
err := fmt.Errorf("error saving user id onto session: %s", err)
apiutil.ErrorHandler(c, gtserror.NewErrorInternalError(err, oauth.HelpfulAdvice), m.processor.InstanceGetV1)
}
c.Redirect(http.StatusFound, "/oauth"+OauthAuthorizePath)
}
// 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 ulid) 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 (m *Module) ValidatePassword(ctx context.Context, email string, password string) (string, gtserror.WithCode) {
if email == "" || password == "" {
err := errors.New("email or password was not provided")
return incorrectPassword(err)
}
user, err := m.db.GetUserByEmailAddress(ctx, email)
if err != nil {
err := fmt.Errorf("user %s was not retrievable from db during oauth authorization attempt: %s", email, err)
return incorrectPassword(err)
}
if user.EncryptedPassword == "" {
err := fmt.Errorf("encrypted password for user %s was empty for some reason", user.Email)
return incorrectPassword(err)
}
if err := bcrypt.CompareHashAndPassword([]byte(user.EncryptedPassword), []byte(password)); err != nil {
err := fmt.Errorf("password hash didn't match for user %s during login attempt: %s", user.Email, err)
return incorrectPassword(err)
}
return user.ID, nil
}
// incorrectPassword wraps the given error in a gtserror.WithCode, and returns
// only a generic 'safe' error message to the user, to not give any info away.
func incorrectPassword(err error) (string, gtserror.WithCode) {
safeErr := fmt.Errorf("password/email combination was incorrect")
return "", gtserror.NewErrorUnauthorized(err, safeErr.Error(), oauth.HelpfulAdvice)
}
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