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forgejo/models/migrations/v1_19/v233.go
oliverpool b6e81357bd
Add Webhook authorization header (#20926)
_This is a different approach to #20267, I took the liberty of adapting
some parts, see below_

## Context

In some cases, a weebhook endpoint requires some kind of authentication.
The usual way is by sending a static `Authorization` header, with a
given token. For instance:

- Matrix expects a `Bearer <token>` (already implemented, by storing the
header cleartext in the metadata - which is buggy on retry #19872)
- TeamCity #18667
- Gitea instances #20267
- SourceHut https://man.sr.ht/graphql.md#authentication-strategies (this
is my actual personal need :)

## Proposed solution

Add a dedicated encrypt column to the webhook table (instead of storing
it as meta as proposed in #20267), so that it gets available for all
present and future hook types (especially the custom ones #19307).

This would also solve the buggy matrix retry #19872.

As a first step, I would recommend focusing on the backend logic and
improve the frontend at a later stage. For now the UI is a simple
`Authorization` field (which could be later customized with `Bearer` and
`Basic` switches):


![2022-08-23-142911](https://user-images.githubusercontent.com/3864879/186162483-5b721504-eef5-4932-812e-eb96a68494cc.png)

The header name is hard-coded, since I couldn't fine any usecase
justifying otherwise.

## Questions

- What do you think of this approach? @justusbunsi @Gusted @silverwind 
- ~~How are the migrations generated? Do I have to manually create a new
file, or is there a command for that?~~
- ~~I started adding it to the API: should I complete it or should I
drop it? (I don't know how much the API is actually used)~~

## Done as well:

- add a migration for the existing matrix webhooks and remove the
`Authorization` logic there


_Closes #19872_

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-authored-by: delvh <dev.lh@web.de>
2022-11-03 20:23:20 +02:00

183 lines
5.3 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package v1_19 //nolint
import (
"fmt"
"code.gitea.io/gitea/models/webhook"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/secret"
"code.gitea.io/gitea/modules/setting"
api "code.gitea.io/gitea/modules/structs"
"xorm.io/builder"
"xorm.io/xorm"
)
func batchProcess[T any](x *xorm.Engine, buf []T, query func(limit, start int) *xorm.Session, process func(*xorm.Session, T) error) error {
size := cap(buf)
start := 0
for {
err := query(size, start).Find(&buf)
if err != nil {
return err
}
if len(buf) == 0 {
return nil
}
err = func() error {
sess := x.NewSession()
defer sess.Close()
if err := sess.Begin(); err != nil {
return fmt.Errorf("unable to allow start session. Error: %w", err)
}
for _, record := range buf {
if err := process(sess, record); err != nil {
return err
}
}
return sess.Commit()
}()
if err != nil {
return err
}
if len(buf) < size {
return nil
}
start += size
buf = buf[:0]
}
}
func AddHeaderAuthorizationEncryptedColWebhook(x *xorm.Engine) error {
// Add the column to the table
type Webhook struct {
ID int64 `xorm:"pk autoincr"`
Type webhook.HookType `xorm:"VARCHAR(16) 'type'"`
Meta string `xorm:"TEXT"` // store hook-specific attributes
// HeaderAuthorizationEncrypted should be accessed using HeaderAuthorization() and SetHeaderAuthorization()
HeaderAuthorizationEncrypted string `xorm:"TEXT"`
}
err := x.Sync(new(Webhook))
if err != nil {
return err
}
// Migrate the matrix webhooks
type MatrixMeta struct {
HomeserverURL string `json:"homeserver_url"`
Room string `json:"room_id"`
MessageType int `json:"message_type"`
}
type MatrixMetaWithAccessToken struct {
MatrixMeta
AccessToken string `json:"access_token"`
}
err = batchProcess(x,
make([]*Webhook, 0, 50),
func(limit, start int) *xorm.Session {
return x.Where("type=?", "matrix").OrderBy("id").Limit(limit, start)
},
func(sess *xorm.Session, hook *Webhook) error {
// retrieve token from meta
var withToken MatrixMetaWithAccessToken
err := json.Unmarshal([]byte(hook.Meta), &withToken)
if err != nil {
return fmt.Errorf("unable to unmarshal matrix meta for webhook[id=%d]: %w", hook.ID, err)
}
if withToken.AccessToken == "" {
return nil
}
// encrypt token
authorization := "Bearer " + withToken.AccessToken
hook.HeaderAuthorizationEncrypted, err = secret.EncryptSecret(setting.SecretKey, authorization)
if err != nil {
return fmt.Errorf("unable to encrypt access token for webhook[id=%d]: %w", hook.ID, err)
}
// remove token from meta
withoutToken, err := json.Marshal(withToken.MatrixMeta)
if err != nil {
return fmt.Errorf("unable to marshal matrix meta for webhook[id=%d]: %w", hook.ID, err)
}
hook.Meta = string(withoutToken)
// save in database
count, err := sess.ID(hook.ID).Cols("meta", "header_authorization_encrypted").Update(hook)
if count != 1 || err != nil {
return fmt.Errorf("unable to update header_authorization_encrypted for webhook[id=%d]: %d,%w", hook.ID, count, err)
}
return nil
})
if err != nil {
return err
}
// Remove access_token from HookTask
type HookTask struct {
ID int64 `xorm:"pk autoincr"`
HookID int64
PayloadContent string `xorm:"LONGTEXT"`
}
type MatrixPayloadSafe struct {
Body string `json:"body"`
MsgType string `json:"msgtype"`
Format string `json:"format"`
FormattedBody string `json:"formatted_body"`
Commits []*api.PayloadCommit `json:"io.gitea.commits,omitempty"`
}
type MatrixPayloadUnsafe struct {
MatrixPayloadSafe
AccessToken string `json:"access_token"`
}
err = batchProcess(x,
make([]*HookTask, 0, 50),
func(limit, start int) *xorm.Session {
return x.Where(builder.And(
builder.In("hook_id", builder.Select("id").From("webhook").Where(builder.Eq{"type": "matrix"})),
builder.Like{"payload_content", "access_token"},
)).OrderBy("id").Limit(limit, 0) // ignore the provided "start", since other payload were already converted and don't contain 'payload_content' anymore
},
func(sess *xorm.Session, hookTask *HookTask) error {
// retrieve token from payload_content
var withToken MatrixPayloadUnsafe
err := json.Unmarshal([]byte(hookTask.PayloadContent), &withToken)
if err != nil {
return fmt.Errorf("unable to unmarshal payload_content for hook_task[id=%d]: %w", hookTask.ID, err)
}
if withToken.AccessToken == "" {
return nil
}
// remove token from payload_content
withoutToken, err := json.Marshal(withToken.MatrixPayloadSafe)
if err != nil {
return fmt.Errorf("unable to marshal payload_content for hook_task[id=%d]: %w", hookTask.ID, err)
}
hookTask.PayloadContent = string(withoutToken)
// save in database
count, err := sess.ID(hookTask.ID).Cols("payload_content").Update(hookTask)
if count != 1 || err != nil {
return fmt.Errorf("unable to update payload_content for hook_task[id=%d]: %d,%w", hookTask.ID, count, err)
}
return nil
})
if err != nil {
return err
}
return nil
}