OIDC provider

go.mod

@@ -317,7 +317,7 @@ replace github.com/hashicorp/go-version => github.com/6543/go-version v1.3.1
 
 replace github.com/shurcooL/vfsgen => github.com/lunny/vfsgen v0.0.0-20220105142115-2c99e1ffdfa0
 
-replace github.com/nektos/act => gitea.com/gitea/act v0.261.4
+replace github.com/nektos/act => gitea.com/gitea/act v0.261.5
 
 // TODO: the only difference is in `PutObject`: the fork doesn't use `NewVerifyingReader(r, sha256.New(), oid, expectedSize)`, need to figure out why
 replace github.com/charmbracelet/git-lfs-transfer => gitea.com/gitea/git-lfs-transfer v0.2.0

go.sum

@@ -16,8 +16,8 @@ filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 git.sr.ht/~mariusor/go-xsd-duration v0.0.0-20220703122237-02e73435a078 h1:cliQ4HHsCo6xi2oWZYKWW4bly/Ory9FuTpFPRxj/mAg=
 git.sr.ht/~mariusor/go-xsd-duration v0.0.0-20220703122237-02e73435a078/go.mod h1:g/V2Hjas6Z1UHUp4yIx6bATpNzJ7DYtD0FG3+xARWxs=
-gitea.com/gitea/act v0.261.4 h1:Tf9eLlvsYFtKcpuxlMvf9yT3g4Hshb2Beqw6C1STuH8=
-gitea.com/gitea/act v0.261.4/go.mod h1:Pg5C9kQY1CEA3QjthjhlrqOC/QOT5NyWNjOjRHw23Ok=
+gitea.com/gitea/act v0.261.5 h1:o4cWLYTy1T5819CCZoBpc9rf0Y8Xev8MatMJUsM7IUY=
+gitea.com/gitea/act v0.261.5/go.mod h1:Pg5C9kQY1CEA3QjthjhlrqOC/QOT5NyWNjOjRHw23Ok=
 gitea.com/gitea/git-lfs-transfer v0.2.0 h1:baHaNoBSRaeq/xKayEXwiDQtlIjps4Ac/Ll4KqLMB40=
 gitea.com/gitea/git-lfs-transfer v0.2.0/go.mod h1:UrXUCm3xLQkq15fu7qlXHUMlrhdlXHoi13KH2Dfiits=
 gitea.com/go-chi/binding v0.0.0-20240430071103-39a851e106ed h1:EZZBtilMLSZNWtHHcgq2mt6NSGhJSZBuduAlinMEmso=

models/actions/permissions.go

@@ -0,0 +1,217 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package actions
+
+import (
+	"errors"
+	"fmt"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Permission int
+
+const (
+	PermissionUnspecified Permission = iota
+	PermissionNone
+	PermissionRead
+	PermissionWrite
+)
+
+// Per https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idpermissions
+type Permissions struct {
+	Actions            Permission `yaml:"actions"`
+	Checks             Permission `yaml:"checks"`
+	Contents           Permission `yaml:"contents"`
+	Deployments        Permission `yaml:"deployments"`
+	IDToken            Permission `yaml:"id-token"`
+	Issues             Permission `yaml:"issues"`
+	Discussions        Permission `yaml:"discussions"`
+	Packages           Permission `yaml:"packages"`
+	Pages              Permission `yaml:"pages"`
+	PullRequests       Permission `yaml:"pull-requests"`
+	RepositoryProjects Permission `yaml:"repository-projects"`
+	SecurityEvents     Permission `yaml:"security-events"`
+	Statuses           Permission `yaml:"statuses"`
+}
+
+// WorkflowPermissions parses a workflow and returns
+// a Permissions struct representing the permissions set
+// at the workflow (i.e. file) level
+func WorkflowPermissions(contents []byte) (Permissions, error) {
+	p := struct {
+		Permissions Permissions `yaml:"permissions"`
+	}{}
+	err := yaml.Unmarshal(contents, &p)
+	return p.Permissions, err
+}
+
+// Given the contents of a workflow, JobPermissions
+// returns a Permissions object representing the permissions
+// of THE FIRST job in the file.
+func JobPermissions(contents []byte) (Permissions, error) {
+	p := struct {
+		Jobs []struct {
+			Permissions Permissions `yaml:"permissions"`
+		} `yaml:"jobs"`
+	}{}
+	err := yaml.Unmarshal(contents, &p)
+	if len(p.Jobs) > 0 {
+		return p.Jobs[0].Permissions, err
+	}
+	return Permissions{}, errors.New("no jobs detected in workflow")
+}
+
+func (p *Permission) UnmarshalYAML(unmarshal func(any) error) error {
+	var data string
+	if err := unmarshal(&data); err != nil {
+		return err
+	}
+
+	switch data {
+	case "none":
+		*p = PermissionNone
+	case "read":
+		*p = PermissionRead
+	case "write":
+		*p = PermissionWrite
+	default:
+		return fmt.Errorf("invalid permission: %s", data)
+	}
+
+	return nil
+}
+
+// DefaultAccessPermissive is the default "permissive" set granted to actions on repositories
+// per https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
+// That page also lists a "metadata" permission that I can't find mentioned anywhere else.
+// However, it seems to always have "read" permission, so it doesn't really matter.
+// Interestingly, it doesn't list "Discussions", so we assume "write" for permissive and "none" for restricted.
+var DefaultAccessPermissive = Permissions{
+	Actions:            PermissionWrite,
+	Checks:             PermissionWrite,
+	Contents:           PermissionWrite,
+	Deployments:        PermissionWrite,
+	IDToken:            PermissionNone,
+	Issues:             PermissionWrite,
+	Discussions:        PermissionWrite,
+	Packages:           PermissionWrite,
+	Pages:              PermissionWrite,
+	PullRequests:       PermissionWrite,
+	RepositoryProjects: PermissionWrite,
+	SecurityEvents:     PermissionWrite,
+	Statuses:           PermissionWrite,
+}
+
+// DefaultAccessRestricted is the default "restrictive" set granted. See docs for
+// DefaultAccessPermissive above.
+//
+// This is not currently used, since Gitea does not have a permissive/restricted setting.
+var DefaultAccessRestricted = Permissions{
+	Actions:            PermissionNone,
+	Checks:             PermissionNone,
+	Contents:           PermissionWrite,
+	Deployments:        PermissionNone,
+	IDToken:            PermissionNone,
+	Issues:             PermissionNone,
+	Discussions:        PermissionNone,
+	Packages:           PermissionRead,
+	Pages:              PermissionNone,
+	PullRequests:       PermissionNone,
+	RepositoryProjects: PermissionNone,
+	SecurityEvents:     PermissionNone,
+	Statuses:           PermissionNone,
+}
+
+var ReadAllPermissions = Permissions{
+	Actions:            PermissionRead,
+	Checks:             PermissionRead,
+	Contents:           PermissionRead,
+	Deployments:        PermissionRead,
+	IDToken:            PermissionRead,
+	Issues:             PermissionRead,
+	Discussions:        PermissionRead,
+	Packages:           PermissionRead,
+	Pages:              PermissionRead,
+	PullRequests:       PermissionRead,
+	RepositoryProjects: PermissionRead,
+	SecurityEvents:     PermissionRead,
+	Statuses:           PermissionRead,
+}
+
+var WriteAllPermissions = Permissions{
+	Actions:            PermissionWrite,
+	Checks:             PermissionWrite,
+	Contents:           PermissionWrite,
+	Deployments:        PermissionWrite,
+	IDToken:            PermissionWrite,
+	Issues:             PermissionWrite,
+	Discussions:        PermissionWrite,
+	Packages:           PermissionWrite,
+	Pages:              PermissionWrite,
+	PullRequests:       PermissionWrite,
+	RepositoryProjects: PermissionWrite,
+	SecurityEvents:     PermissionWrite,
+	Statuses:           PermissionWrite,
+}
+
+// FromYAML takes a yaml.Node representing a permissions
+// definition and parses it into a Permissions struct
+func (p *Permissions) FromYAML(rawPermissions *yaml.Node) error {
+	switch rawPermissions.Kind {
+	case yaml.ScalarNode:
+		var val string
+		err := rawPermissions.Decode(&val)
+		if err != nil {
+			return err
+		}
+		if val == "read-all" {
+			*p = ReadAllPermissions
+		}
+		if val == "write-all" {
+			*p = WriteAllPermissions
+		}
+		return fmt.Errorf("unexpected `permissions` value: %v", rawPermissions)
+	case yaml.MappingNode:
+		var perms Permissions
+		err := rawPermissions.Decode(&perms)
+		if err != nil {
+			return err
+		}
+		return nil
+	case 0:
+		*p = Permissions{}
+		return nil
+	default:
+		return fmt.Errorf("invalid permissions value: %v", rawPermissions)
+	}
+}
+
+func merge[T comparable](a, b T) T {
+	var zero T
+	if a == zero {
+		return b
+	}
+	return a
+}
+
+// Merge merges two Permission values
+//
+// Already set values take precedence over `other`.
+// I.e. you want to call jobLevel.Permissions.Merge(topLevel.Permissions)
+func (p *Permissions) Merge(other Permissions) {
+	p.Actions = merge(p.Actions, other.Actions)
+	p.Checks = merge(p.Checks, other.Checks)
+	p.Contents = merge(p.Contents, other.Contents)
+	p.Deployments = merge(p.Deployments, other.Deployments)
+	p.IDToken = merge(p.IDToken, other.IDToken)
+	p.Issues = merge(p.Issues, other.Issues)
+	p.Discussions = merge(p.Discussions, other.Discussions)
+	p.Packages = merge(p.Packages, other.Packages)
+	p.Pages = merge(p.Pages, other.Pages)
+	p.PullRequests = merge(p.PullRequests, other.PullRequests)
+	p.RepositoryProjects = merge(p.RepositoryProjects, other.RepositoryProjects)
+	p.SecurityEvents = merge(p.SecurityEvents, other.SecurityEvents)
+	p.Statuses = merge(p.Statuses, other.Statuses)
+}

models/actions/run.go

@@ -47,6 +47,7 @@ type ActionRun struct {
 	EventPayload      string                       `xorm:"LONGTEXT"`
 	TriggerEvent      string                       // the trigger event defined in the `on` configuration of the triggered workflow
 	Status            Status                       `xorm:"index"`
+	Permissions       Permissions                  `xorm:"-"`
 	Version           int                          `xorm:"version default 0"` // Status could be updated concomitantly, so an optimistic lock is needed
 	// Started and Stopped is used for recording last run time, if rerun happened, they will be reset to 0
 	Started timeutil.TimeStamp
@@ -83,6 +84,38 @@ func (run *ActionRun) WorkflowLink() string {
 	return fmt.Sprintf("%s/actions/?workflow=%s", run.Repo.Link(), run.WorkflowID)
 }
 
+func (run *ActionRun) RefShaBaseRefAndHeadRef() (string, string, string, string) {
+	var ref, sha, baseRef, headRef string
+
+	ref = run.Ref
+	sha = run.CommitSHA
+
+	if pullPayload, err := run.GetPullRequestEventPayload(); err == nil && pullPayload.PullRequest != nil && pullPayload.PullRequest.Base != nil && pullPayload.PullRequest.Head != nil {
+		baseRef = pullPayload.PullRequest.Base.Ref
+		headRef = pullPayload.PullRequest.Head.Ref
+
+		// if the TriggerEvent is pull_request_target, ref and sha need to be set according to the base of pull request
+		// In GitHub's documentation, ref should be the branch or tag that triggered workflow. But when the TriggerEvent is pull_request_target,
+		// the ref will be the base branch.
+		if run.TriggerEvent == "pull_request_target" {
+			ref = git.BranchPrefix + pullPayload.PullRequest.Base.Name
+			sha = pullPayload.PullRequest.Base.Sha
+		}
+	}
+	return ref, sha, baseRef, headRef
+}
+
+func (run *ActionRun) EventName() string {
+	// TriggerEvent is added in https://github.com/go-gitea/gitea/pull/25229
+	// This fallback is for the old ActionRun that doesn't have the TriggerEvent field
+	// and should be removed in 1.22
+	eventName := run.TriggerEvent
+	if eventName == "" {
+		eventName = run.Event.Event()
+	}
+	return eventName
+}
+
 // RefLink return the url of run's ref
 func (run *ActionRun) RefLink() string {
 	refName := git.RefName(run.Ref)
@@ -314,7 +347,7 @@ func InsertRun(ctx context.Context, run *ActionRun, jobs []*jobparser.SingleWork
 			hasWaiting = true
 		}
 		job.Name = util.EllipsisDisplayString(job.Name, 255)
-		runJobs = append(runJobs, &ActionRunJob{
+		runJob := &ActionRunJob{
 			RunID:             run.ID,
 			RepoID:            run.RepoID,
 			OwnerID:           run.OwnerID,
@@ -326,7 +359,19 @@ func InsertRun(ctx context.Context, run *ActionRun, jobs []*jobparser.SingleWork
 			Needs:             needs,
 			RunsOn:            job.RunsOn(),
 			Status:            status,
-		})
+		}
+		runJobs = append(runJobs, runJob)
+
+		// Parse the job's permissions
+		if err := job.RawPermissions.Decode(&runJob.Permissions); err != nil {
+			return err
+		}
+
+		// Merge the job's permissions with the workflow permissions.
+		// Job permissions take precedence.
+		runJob.Permissions.Merge(run.Permissions)
+
+		runJobs = append(runJobs, runJob)
 	}
 	if err := db.Insert(ctx, runJobs); err != nil {
 		return err

models/actions/run_job.go

@@ -30,11 +30,12 @@ type ActionRunJob struct {
 	Name              string `xorm:"VARCHAR(255)"`
 	Attempt           int64
 	WorkflowPayload   []byte
-	JobID             string   `xorm:"VARCHAR(255)"` // job id in workflow, not job's id
-	Needs             []string `xorm:"JSON TEXT"`
-	RunsOn            []string `xorm:"JSON TEXT"`
-	TaskID            int64    // the latest task of the job
-	Status            Status   `xorm:"index"`
+	JobID             string      `xorm:"VARCHAR(255)"` // job id in workflow, not job's id
+	Needs             []string    `xorm:"JSON TEXT"`
+	RunsOn            []string    `xorm:"JSON TEXT"`
+	Permissions       Permissions `xorm:"JSON TEXT"`
+	TaskID            int64       // the latest task of the job
+	Status            Status      `xorm:"index"`
 	Started           timeutil.TimeStamp
 	Stopped           timeutil.TimeStamp
 	Created           timeutil.TimeStamp `xorm:"created"`
@@ -84,6 +85,10 @@ func (job *ActionRunJob) LoadAttributes(ctx context.Context) error {
 	return job.Run.LoadAttributes(ctx)
 }
 
+func (job *ActionRunJob) MayCreateIDToken() bool {
+	return job.Permissions.IDToken == PermissionWrite
+}
+
 func GetRunJobByID(ctx context.Context, id int64) (*ActionRunJob, error) {
 	var job ActionRunJob
 	has, err := db.GetEngine(ctx).Where("id=?", id).Get(&job)

models/migrations/migrations.go

@@ -381,6 +381,7 @@ func prepareMigrationTasks() []*migration {
 		newMigration(317, "Add new index for action for heatmap", v1_24.AddNewIndexForUserDashboard),
 		newMigration(318, "Add anonymous_access_mode for repo_unit", v1_24.AddRepoUnitAnonymousAccessMode),
 		newMigration(319, "Add ExclusiveOrder to Label table", v1_24.AddExclusiveOrderColumnToLabelTable),
+		newMigration(320, "Add Permissions to Actions Task", v1_24.AddPermissions),
 	}
 	return preparedMigrations
 }

models/migrations/v1_24/v320.go

@@ -0,0 +1,43 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_24 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+// Permission copied from models.actions.Permission
+type Permission int
+
+const (
+	PermissionUnspecified Permission = iota
+	PermissionNone
+	PermissionRead
+	PermissionWrite
+)
+
+// Permissions copied from models.actions.Permissions
+type Permissions struct {
+	Actions            Permission `yaml:"actions"`
+	Checks             Permission `yaml:"checks"`
+	Contents           Permission `yaml:"contents"`
+	Deployments        Permission `yaml:"deployments"`
+	IDToken            Permission `yaml:"id-token"`
+	Issues             Permission `yaml:"issues"`
+	Discussions        Permission `yaml:"discussions"`
+	Packages           Permission `yaml:"packages"`
+	Pages              Permission `yaml:"pages"`
+	PullRequests       Permission `yaml:"pull-requests"`
+	RepositoryProjects Permission `yaml:"repository-projects"`
+	SecurityEvents     Permission `yaml:"security-events"`
+	Statuses           Permission `yaml:"statuses"`
+}
+
+func AddPermissions(x *xorm.Engine) error {
+	type ActionRunJob struct {
+		Permissions Permissions `xorm:"JSON TEXT"`
+	}
+
+	return x.Sync(new(ActionRunJob))
+}