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mirror of https://github.com/go-gitea/gitea.git synced 2026-03-29 22:50:12 +02:00
Excellencedev 45809c8f54
feat: Add configurable permissions for Actions automatic tokens (#36173)
## Overview

This PR introduces granular permission controls for Gitea Actions tokens
(`GITEA_TOKEN`), aligning Gitea's security model with GitHub Actions
standards while maintaining compatibility with Gitea's unique repository
unit system.

It addresses the need for finer access control by allowing
administrators and repository owners to define default token
permissions, set maximum permission ceilings, and control
cross-repository access within organizations.

## Key Features

### 1. Granular Token Permissions

- **Standard Keyword Support**: Implements support for the
`permissions:` keyword in workflow and job YAML files (e.g., `contents:
read`, `issues: write`).
- **Permission Modes**:
- **Permissive**: Default write access for most units (backwards
compatible).
- **Restricted**: Default read-only access for `contents` and
`packages`, with no access to other units.
- ~~**Custom**: Allows defining specific default levels for each unit
type (Code, Issues, PRs, Packages, etc.).~~**EDIT removed UI was
confusing**
- **Clamping Logic**: Workflow-defined permissions are automatically
"clamped" by repository or organization-level maximum settings.
Workflows cannot escalate their own permissions beyond these limits.

### 2. Organization & Repository Settings

- **Settings UI**: Added new settings pages at both Organization and
Repository levels to manage Actions token defaults and maximums.
- **Inheritance**: Repositories can be configured to "Follow
organization-level configuration," simplifying management across large
organizations.
- **Cross-Repository Access**: Added a policy to control whether Actions
workflows can access other repositories or packages within the same
organization. This can be set to "None," "All," or restricted to a
"Selected" list of repositories.

### 3. Security Hardening

- **Fork Pull Request Protection**: Tokens for workflows triggered by
pull requests from forks are strictly enforced as read-only, regardless
of repository settings.
- ~~**Package Access**: Actions tokens can now only access packages
explicitly linked to a repository, with cross-repo access governed by
the organization's security policy.~~ **EDIT removed
https://github.com/go-gitea/gitea/pull/36173#issuecomment-3873675346**
- **Git Hook Integration**: Propagates Actions Task IDs to git hooks to
ensure that pushes performed by Actions tokens respect the specific
permissions granted at runtime.

### 4. Technical Implementation

- **Permission Persistence**: Parsed permissions are calculated at job
creation and stored in the `action_run_job` table. This ensures the
token's authority is deterministic throughout the job's lifecycle.
- **Parsing Priority**: Implemented a priority system in the YAML parser
where the broad `contents` scope is applied first, allowing granular
scopes like `code` or `releases` to override it for precise control.
- **Re-runs**: Permissions are re-evaluated during a job re-run to
incorporate any changes made to repository settings in the interim.

### How to Test

1. **Unit Tests**: Run `go test ./services/actions/...` and `go test
./models/repo/...` to verify parsing logic and permission clamping.
2. **Integration Tests**: Comprehensive tests have been added to
`tests/integration/actions_job_token_test.go` covering:
   - Permissive vs. Restricted mode behavior.
   - YAML `permissions:` keyword evaluation.
   - Organization cross-repo access policies.
- Resource access (Git, API, and Packages) under various permission
configs.
3. **Manual Verification**: 
   - Navigate to **Site/Org/Repo Settings -> Actions -> General**.
- Change "Default Token Permissions" and verify that newly triggered
workflows reflect these changes in their `GITEA_TOKEN` capabilities.
- Attempt a cross-repo API call from an Action and verify the Org policy
is enforced.

## Documentation

Added a PR in gitea's docs for this :
https://gitea.com/gitea/docs/pulls/318

## UI:

<img width="1366" height="619" alt="Screenshot 2026-01-24 174112"
src="https://github.com/user-attachments/assets/bfa29c9a-4ea5-4346-9410-16d491ef3d44"
/>

<img width="1360" height="621" alt="Screenshot 2026-01-24 174048"
src="https://github.com/user-attachments/assets/d5ec46c8-9a13-4874-a6a4-fb379936cef5"
/>

/fixes #24635
/claim #24635

---------

Signed-off-by: Excellencedev <ademiluyisuccessandexcellence@gmail.com>
Signed-off-by: ChristopherHX <christopher.homberger@web.de>
Signed-off-by: silverwind <me@silverwind.io>
Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
2026-03-21 15:39:47 -07:00

185 lines
5.9 KiB
Go

// Copyright 2025 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package actions
import (
"context"
"fmt"
actions_model "code.gitea.io/gitea/models/actions"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/actions/jobparser"
"code.gitea.io/gitea/modules/util"
notify_service "code.gitea.io/gitea/services/notify"
"go.yaml.in/yaml/v4"
)
// PrepareRunAndInsert prepares a run and inserts it into the database
// It parses the workflow content, evaluates concurrency if needed, and inserts the run and its jobs into the database.
// The title will be cut off at 255 characters if it's longer than 255 characters.
func PrepareRunAndInsert(ctx context.Context, content []byte, run *actions_model.ActionRun, inputsWithDefaults map[string]any) error {
if err := run.LoadAttributes(ctx); err != nil {
return fmt.Errorf("LoadAttributes: %w", err)
}
vars, err := actions_model.GetVariablesOfRun(ctx, run)
if err != nil {
return fmt.Errorf("GetVariablesOfRun: %w", err)
}
wfRawConcurrency, err := jobparser.ReadWorkflowRawConcurrency(content)
if err != nil {
return fmt.Errorf("ReadWorkflowRawConcurrency: %w", err)
}
if wfRawConcurrency != nil {
err = EvaluateRunConcurrencyFillModel(ctx, run, wfRawConcurrency, vars, inputsWithDefaults)
if err != nil {
return fmt.Errorf("EvaluateRunConcurrencyFillModel: %w", err)
}
}
giteaCtx := GenerateGiteaContext(run, nil)
jobs, err := jobparser.Parse(content, jobparser.WithVars(vars), jobparser.WithGitContext(giteaCtx.ToGitHubContext()), jobparser.WithInputs(inputsWithDefaults))
if err != nil {
return fmt.Errorf("parse workflow: %w", err)
}
if len(jobs) > 0 && jobs[0].RunName != "" {
run.Title = jobs[0].RunName
}
if err = InsertRun(ctx, run, jobs, vars, inputsWithDefaults); err != nil {
return fmt.Errorf("InsertRun: %w", err)
}
// Load the newly inserted jobs with all fields from database (the job models in InsertRun are partial, so load again)
allJobs, err := db.Find[actions_model.ActionRunJob](ctx, actions_model.FindRunJobOptions{RunID: run.ID})
if err != nil {
return fmt.Errorf("FindRunJob: %w", err)
}
CreateCommitStatusForRunJobs(ctx, run, allJobs...)
notify_service.WorkflowRunStatusUpdate(ctx, run.Repo, run.TriggerUser, run)
for _, job := range allJobs {
notify_service.WorkflowJobStatusUpdate(ctx, run.Repo, run.TriggerUser, job, nil)
}
return nil
}
// InsertRun inserts a run
// The title will be cut off at 255 characters if it's longer than 255 characters.
func InsertRun(ctx context.Context, run *actions_model.ActionRun, jobs []*jobparser.SingleWorkflow, vars map[string]string, inputs map[string]any) error {
return db.WithTx(ctx, func(ctx context.Context) error {
index, err := db.GetNextResourceIndex(ctx, "action_run_index", run.RepoID)
if err != nil {
return err
}
run.Index = index
run.Title = util.EllipsisDisplayString(run.Title, 255)
// check run (workflow-level) concurrency
run.Status, err = PrepareToStartRunWithConcurrency(ctx, run)
if err != nil {
return err
}
if err := db.Insert(ctx, run); err != nil {
return err
}
if err := run.LoadRepo(ctx); err != nil {
return err
}
if err := actions_model.UpdateRepoRunsNumbers(ctx, run.Repo); err != nil {
return err
}
runJobs := make([]*actions_model.ActionRunJob, 0, len(jobs))
var hasWaitingJobs bool
for _, v := range jobs {
id, job := v.Job()
needs := job.Needs()
if err := v.SetJob(id, job.EraseNeeds()); err != nil {
return err
}
payload, _ := v.Marshal()
shouldBlockJob := len(needs) > 0 || run.NeedApproval || run.Status == actions_model.StatusBlocked
job.Name = util.EllipsisDisplayString(job.Name, 255)
runJob := &actions_model.ActionRunJob{
RunID: run.ID,
RepoID: run.RepoID,
OwnerID: run.OwnerID,
CommitSHA: run.CommitSHA,
IsForkPullRequest: run.IsForkPullRequest,
Name: job.Name,
WorkflowPayload: payload,
JobID: id,
Needs: needs,
RunsOn: job.RunsOn(),
Status: util.Iif(shouldBlockJob, actions_model.StatusBlocked, actions_model.StatusWaiting),
}
// Parse workflow/job permissions (no clamping here)
if perms := ExtractJobPermissionsFromWorkflow(v, job); perms != nil {
runJob.TokenPermissions = perms
}
// check job concurrency
if job.RawConcurrency != nil {
rawConcurrency, err := yaml.Marshal(job.RawConcurrency)
if err != nil {
return fmt.Errorf("marshal raw concurrency: %w", err)
}
runJob.RawConcurrency = string(rawConcurrency)
// do not evaluate job concurrency when it requires `needs`, the jobs with `needs` will be evaluated later by job emitter
if len(needs) == 0 {
err = EvaluateJobConcurrencyFillModel(ctx, run, runJob, vars, inputs)
if err != nil {
return fmt.Errorf("evaluate job concurrency: %w", err)
}
}
// If a job needs other jobs ("needs" is not empty), its status is set to StatusBlocked at the entry of the loop
// No need to check job concurrency for a blocked job (it will be checked by job emitter later)
if runJob.Status == actions_model.StatusWaiting {
runJob.Status, err = PrepareToStartJobWithConcurrency(ctx, runJob)
if err != nil {
return fmt.Errorf("prepare to start job with concurrency: %w", err)
}
}
}
hasWaitingJobs = hasWaitingJobs || runJob.Status == actions_model.StatusWaiting
if err := db.Insert(ctx, runJob); err != nil {
return err
}
runJobs = append(runJobs, runJob)
}
run.Status = actions_model.AggregateJobStatus(runJobs)
if err := actions_model.UpdateRun(ctx, run, "status"); err != nil {
return err
}
// if there is a job in the waiting status, increase tasks version.
if hasWaitingJobs {
if err := actions_model.IncreaseTaskVersion(ctx, run.OwnerID, run.RepoID); err != nil {
return err
}
}
return nil
})
}