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// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package security
import (
"bytes"
"encoding/base64"
"html/template"
"image/png"
"net/http"
"strings"
"code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/web"
"code.gitea.io/gitea/services/context"
"code.gitea.io/gitea/services/forms"
"code.gitea.io/gitea/services/mailer"
"github.com/pquerna/otp"
"github.com/pquerna/otp/totp"
)
// RegenerateScratchTwoFactor regenerates the user's 2FA scratch code.
func RegenerateScratchTwoFactor(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("settings")
ctx.Data["PageIsSettingsSecurity"] = true
t, err := auth.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if err != nil {
if auth.IsErrTwoFactorNotEnrolled(err) {
ctx.Flash.Error(ctx.Tr("settings.twofa_not_enrolled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
ctx.ServerError("SettingsTwoFactor: Failed to GetTwoFactorByUID", err)
return
}
token, err := t.GenerateScratchToken()
if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to GenerateScratchToken", err)
return
}
if err = auth.UpdateTwoFactor(ctx, t); err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to UpdateTwoFactor", err)
return
}
ctx.Flash.Success(ctx.Tr("settings.twofa_scratch_token_regenerated", token))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
// DisableTwoFactor deletes the user's 2FA settings.
func DisableTwoFactor(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("settings")
ctx.Data["PageIsSettingsSecurity"] = true
t, err := auth.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if err != nil {
if auth.IsErrTwoFactorNotEnrolled(err) {
ctx.Flash.Error(ctx.Tr("settings.twofa_not_enrolled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
ctx.ServerError("SettingsTwoFactor: Failed to GetTwoFactorByUID", err)
return
}
if err = auth.DeleteTwoFactorByID(ctx, t.ID, ctx.Doer.ID); err != nil {
if auth.IsErrTwoFactorNotEnrolled(err) {
// There is a potential DB race here - we must have been disabled by another request in the intervening period
ctx.Flash.Success(ctx.Tr("settings.twofa_disabled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
ctx.ServerError("SettingsTwoFactor: Failed to DeleteTwoFactorByID", err)
return
}
if err := mailer.SendDisabledTOTP(ctx, ctx.Doer); err != nil {
ctx.ServerError("SendDisabledTOTP", err)
return
}
ctx.Flash.Success(ctx.Tr("settings.twofa_disabled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
func twofaGenerateSecretAndQr(ctx *context.Context) bool {
var otpKey *otp.Key
var err error
uri := ctx.Session.Get("twofaUri")
if uri != nil {
otpKey, err = otp.NewKeyFromURL(uri.(string))
if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed NewKeyFromURL: ", err)
return false
}
}
// Filter unsafe character ':' in issuer
issuer := strings.ReplaceAll(setting.AppName+" ("+setting.Domain+")", ":", "")
if otpKey == nil {
otpKey, err = totp.Generate(totp.GenerateOpts{
SecretSize: 40,
Issuer: issuer,
AccountName: ctx.Doer.Name,
})
if err != nil {
ctx.ServerError("SettingsTwoFactor: totpGenerate Failed", err)
return false
}
}
ctx.Data["TwofaSecret"] = otpKey.Secret()
img, err := otpKey.Image(320, 240)
if err != nil {
ctx.ServerError("SettingsTwoFactor: otpKey image generation failed", err)
return false
}
var imgBytes bytes.Buffer
if err = png.Encode(&imgBytes, img); err != nil {
ctx.ServerError("SettingsTwoFactor: otpKey png encoding failed", err)
return false
}
ctx.Data["QrUri"] = template.URL("data:image/png;base64," + base64.StdEncoding.EncodeToString(imgBytes.Bytes()))
if err := ctx.Session.Set("twofaSecret", otpKey.Secret()); err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to set session for twofaSecret", err)
return false
}
if err := ctx.Session.Set("twofaUri", otpKey.String()); err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to set session for twofaUri", err)
return false
}
// Here we're just going to try to release the session early
if err := ctx.Session.Release(); err != nil {
// we'll tolerate errors here as they *should* get saved elsewhere
log.Error("Unable to save changes to the session: %v", err)
}
return true
}
// EnrollTwoFactor shows the page where the user can enroll into 2FA.
func EnrollTwoFactor(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("settings")
ctx.Data["PageIsSettingsSecurity"] = true
t, err := auth.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if t != nil {
// already enrolled - we should redirect back!
log.Warn("Trying to re-enroll %-v in twofa when already enrolled", ctx.Doer)
ctx.Flash.Error(ctx.Tr("settings.twofa_is_enrolled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
return
}
if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
ctx.ServerError("SettingsTwoFactor: GetTwoFactorByUID", err)
return
}
if !twofaGenerateSecretAndQr(ctx) {
return
}
ctx.HTML(http.StatusOK, tplSettingsTwofaEnroll)
}
// EnrollTwoFactorPost handles enrolling the user into 2FA.
func EnrollTwoFactorPost(ctx *context.Context) {
form := web.GetForm(ctx).(*forms.TwoFactorAuthForm)
ctx.Data["Title"] = ctx.Tr("settings")
ctx.Data["PageIsSettingsSecurity"] = true
t, err := auth.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if t != nil {
// already enrolled
ctx.Flash.Error(ctx.Tr("settings.twofa_is_enrolled"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
return
}
if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
ctx.ServerError("SettingsTwoFactor: Failed to check if already enrolled with GetTwoFactorByUID", err)
return
}
if ctx.HasError() {
if !twofaGenerateSecretAndQr(ctx) {
return
}
ctx.HTML(http.StatusOK, tplSettingsTwofaEnroll)
return
}
secretRaw := ctx.Session.Get("twofaSecret")
if secretRaw == nil {
ctx.Flash.Error(ctx.Tr("settings.twofa_failed_get_secret"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security/two_factor/enroll")
return
}
secret := secretRaw.(string)
if !totp.Validate(form.Passcode, secret) {
if !twofaGenerateSecretAndQr(ctx) {
return
}
ctx.Flash.Error(ctx.Tr("settings.passcode_invalid"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security/two_factor/enroll")
return
}
t = &auth.TwoFactor{
UID: ctx.Doer.ID,
}
err = t.SetSecret(secret)
if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to set secret", err)
return
}
token, err := t.GenerateScratchToken()
if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to generate scratch token", err)
return
}
// Now we have to delete the secrets - because if we fail to insert then it's highly likely that they have already been used
// If we can detect the unique constraint failure below we can move this to after the NewTwoFactor
if err := ctx.Session.Delete("twofaSecret"); err != nil {
// tolerate this failure - it's more important to continue
log.Error("Unable to delete twofaSecret from the session: Error: %v", err)
}
if err := ctx.Session.Delete("twofaUri"); err != nil {
// tolerate this failure - it's more important to continue
log.Error("Unable to delete twofaUri from the session: Error: %v", err)
}
if err := ctx.Session.Release(); err != nil {
// tolerate this failure - it's more important to continue
log.Error("Unable to save changes to the session: %v", err)
}
if err := mailer.SendTOTPEnrolled(ctx, ctx.Doer); err != nil {
ctx.ServerError("SendTOTPEnrolled", err)
return
}
if err = auth.NewTwoFactor(ctx, t); err != nil {
// FIXME: We need to handle a unique constraint fail here it's entirely possible that another request has beaten us.
// If there is a unique constraint fail we should just tolerate the error
ctx.ServerError("SettingsTwoFactor: Failed to save two factor", err)
return
}
ctx.Flash.Success(ctx.Tr("settings.twofa_enrolled", token))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
}
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