feat: Add configurable permissions for Actions automatic tokens

models/perm/access/repo_permission.go

@@ -266,13 +266,18 @@ func GetActionsUserRepoPermission(ctx context.Context, repo *repo_model.Reposito
 		return perm, err
 	}
 
-	var accessMode perm_model.AccessMode
+	if err := repo.LoadUnits(ctx); err != nil {
+		return perm, err
+	}
+
+	actionsUnit := repo.MustGetUnit(ctx, unit.TypeActions)
+	actionsCfg := actionsUnit.ActionsConfig()
+
 	if task.RepoID != repo.ID {
 		taskRepo, exist, err := db.GetByID[repo_model.Repository](ctx, task.RepoID)
 		if err != nil || !exist {
 			return perm, err
 		}
-		actionsCfg := repo.MustGetUnit(ctx, unit.TypeActions).ActionsConfig()
 		if !actionsCfg.IsCollaborativeOwner(taskRepo.OwnerID) || !taskRepo.IsPrivate {
 			// The task repo can access the current repo only if the task repo is private and
 			// the owner of the task repo is a collaborative owner of the current repo.
@@ -280,17 +285,33 @@ func GetActionsUserRepoPermission(ctx context.Context, repo *repo_model.Reposito
 			// FIXME should owner's visibility also be considered here?
 			return perm, nil
 		}
-		accessMode = perm_model.AccessModeRead
-	} else if task.IsForkPullRequest {
-		accessMode = perm_model.AccessModeRead
-	} else {
-		accessMode = perm_model.AccessModeWrite
+		// Cross-repo access is always read-only
+		perm.SetUnitsWithDefaultAccessMode(repo.Units, perm_model.AccessModeRead)
+		return perm, nil
 	}
 
-	if err := repo.LoadUnits(ctx); err != nil {
-		return perm, err
+	// Get effective token permissions from repository settings
+	effectivePerms := actionsCfg.GetEffectiveTokenPermissions(task.IsForkPullRequest)
+
+	// Set up per-unit access modes based on configured permissions
+	perm.units = repo.Units
+	perm.unitsMode = make(map[unit.Type]perm_model.AccessMode)
+	perm.unitsMode[unit.TypeCode] = effectivePerms.Contents
+	perm.unitsMode[unit.TypeIssues] = effectivePerms.Issues
+	perm.unitsMode[unit.TypePullRequests] = effectivePerms.PullRequests
+	perm.unitsMode[unit.TypePackages] = effectivePerms.Packages
+	perm.unitsMode[unit.TypeActions] = effectivePerms.Actions
+	perm.unitsMode[unit.TypeWiki] = effectivePerms.Wiki
+
+	// Set base access mode to the maximum of all unit permissions
+	maxMode := perm_model.AccessModeNone
+	for _, mode := range perm.unitsMode {
+		if mode > maxMode {
+			maxMode = mode
+		}
 	}
-	perm.SetUnitsWithDefaultAccessMode(repo.Units, accessMode)
+	perm.AccessMode = maxMode
+
 	return perm, nil
 }
 

models/repo/repo_unit.go

@@ -168,11 +168,78 @@ func (cfg *PullRequestsConfig) GetDefaultMergeStyle() MergeStyle {
 	return MergeStyleMerge
 }
 
+// ActionsTokenPermissionMode defines the default permission mode for Actions tokens
+type ActionsTokenPermissionMode string
+
+const (
+	// ActionsTokenPermissionModePermissive - write access by default (current behavior, backwards compatible)
+	ActionsTokenPermissionModePermissive ActionsTokenPermissionMode = "permissive"
+	// ActionsTokenPermissionModeRestricted - read access by default
+	ActionsTokenPermissionModeRestricted ActionsTokenPermissionMode = "restricted"
+)
+
+// ActionsTokenPermissions defines the permissions for different repository units
+type ActionsTokenPermissions struct {
+	// Contents (repository code) - read/write/none
+	Contents perm.AccessMode `json:"contents"`
+	// Issues - read/write/none
+	Issues perm.AccessMode `json:"issues"`
+	// PullRequests - read/write/none
+	PullRequests perm.AccessMode `json:"pull_requests"`
+	// Packages - read/write/none
+	Packages perm.AccessMode `json:"packages"`
+	// Actions - read/write/none
+	Actions perm.AccessMode `json:"actions"`
+	// Wiki - read/write/none
+	Wiki perm.AccessMode `json:"wiki"`
+}
+
+// DefaultActionsTokenPermissions returns the default permissions for permissive mode
+func DefaultActionsTokenPermissions(mode ActionsTokenPermissionMode) ActionsTokenPermissions {
+	if mode == ActionsTokenPermissionModeRestricted {
+		return ActionsTokenPermissions{
+			Contents:     perm.AccessModeRead,
+			Issues:       perm.AccessModeRead,
+			PullRequests: perm.AccessModeRead,
+			Packages:     perm.AccessModeRead,
+			Actions:      perm.AccessModeRead,
+			Wiki:         perm.AccessModeRead,
+		}
+	}
+	// Permissive mode (default)
+	return ActionsTokenPermissions{
+		Contents:     perm.AccessModeWrite,
+		Issues:       perm.AccessModeWrite,
+		PullRequests: perm.AccessModeWrite,
+		Packages:     perm.AccessModeRead, // Packages read by default for security
+		Actions:      perm.AccessModeWrite,
+		Wiki:         perm.AccessModeWrite,
+	}
+}
+
+// ForkPullRequestPermissions returns the restricted permissions for fork pull requests
+func ForkPullRequestPermissions() ActionsTokenPermissions {
+	return ActionsTokenPermissions{
+		Contents:     perm.AccessModeRead,
+		Issues:       perm.AccessModeRead,
+		PullRequests: perm.AccessModeRead,
+		Packages:     perm.AccessModeRead,
+		Actions:      perm.AccessModeRead,
+		Wiki:         perm.AccessModeRead,
+	}
+}
+
 type ActionsConfig struct {
 	DisabledWorkflows []string
 	// CollaborativeOwnerIDs is a list of owner IDs used to share actions from private repos.
 	// Only workflows from the private repos whose owners are in CollaborativeOwnerIDs can access the current repo's actions.
 	CollaborativeOwnerIDs []int64
+	// TokenPermissionMode defines the default permission mode (permissive or restricted)
+	TokenPermissionMode ActionsTokenPermissionMode `json:"token_permission_mode,omitempty"`
+	// DefaultTokenPermissions defines the default permissions for workflow tokens
+	DefaultTokenPermissions *ActionsTokenPermissions `json:"default_token_permissions,omitempty"`
+	// MaxTokenPermissions defines the maximum permissions (cannot be exceeded by workflow permissions keyword)
+	MaxTokenPermissions *ActionsTokenPermissions `json:"max_token_permissions,omitempty"`
 }
 
 func (cfg *ActionsConfig) EnableWorkflow(file string) {
@@ -209,6 +276,59 @@ func (cfg *ActionsConfig) IsCollaborativeOwner(ownerID int64) bool {
 	return slices.Contains(cfg.CollaborativeOwnerIDs, ownerID)
 }
 
+// GetTokenPermissionMode returns the token permission mode (defaults to permissive for backwards compatibility)
+func (cfg *ActionsConfig) GetTokenPermissionMode() ActionsTokenPermissionMode {
+	if cfg.TokenPermissionMode == "" {
+		return ActionsTokenPermissionModePermissive
+	}
+	return cfg.TokenPermissionMode
+}
+
+// GetEffectiveTokenPermissions returns the effective token permissions based on settings and context
+func (cfg *ActionsConfig) GetEffectiveTokenPermissions(isForkPullRequest bool) ActionsTokenPermissions {
+	// Fork pull requests always get restricted read-only access for security
+	if isForkPullRequest {
+		return ForkPullRequestPermissions()
+	}
+
+	// Use custom default permissions if set
+	if cfg.DefaultTokenPermissions != nil {
+		return *cfg.DefaultTokenPermissions
+	}
+
+	// Otherwise use mode-based defaults
+	return DefaultActionsTokenPermissions(cfg.GetTokenPermissionMode())
+}
+
+// GetMaxTokenPermissions returns the maximum allowed permissions
+func (cfg *ActionsConfig) GetMaxTokenPermissions() ActionsTokenPermissions {
+	if cfg.MaxTokenPermissions != nil {
+		return *cfg.MaxTokenPermissions
+	}
+	// Default max is write for everything except packages
+	return ActionsTokenPermissions{
+		Contents:     perm.AccessModeWrite,
+		Issues:       perm.AccessModeWrite,
+		PullRequests: perm.AccessModeWrite,
+		Packages:     perm.AccessModeWrite,
+		Actions:      perm.AccessModeWrite,
+		Wiki:         perm.AccessModeWrite,
+	}
+}
+
+// ClampPermissions ensures that the given permissions don't exceed the maximum
+func (cfg *ActionsConfig) ClampPermissions(perms ActionsTokenPermissions) ActionsTokenPermissions {
+	maxPerms := cfg.GetMaxTokenPermissions()
+	return ActionsTokenPermissions{
+		Contents:     min(perms.Contents, maxPerms.Contents),
+		Issues:       min(perms.Issues, maxPerms.Issues),
+		PullRequests: min(perms.PullRequests, maxPerms.PullRequests),
+		Packages:     min(perms.Packages, maxPerms.Packages),
+		Actions:      min(perms.Actions, maxPerms.Actions),
+		Wiki:         min(perms.Wiki, maxPerms.Wiki),
+	}
+}
+
 // FromDB fills up a ActionsConfig from serialized format.
 func (cfg *ActionsConfig) FromDB(bs []byte) error {
 	return json.UnmarshalHandleDoubleEncode(bs, &cfg)

models/repo/repo_unit_test.go

@@ -6,6 +6,8 @@ package repo
 import (
 	"testing"
 
+	"code.gitea.io/gitea/models/perm"
+
 	"github.com/stretchr/testify/assert"
 )
 
@@ -28,3 +30,76 @@ func TestActionsConfig(t *testing.T) {
 	cfg.DisableWorkflow("test3.yaml")
 	assert.Equal(t, "test1.yaml,test2.yaml,test3.yaml", cfg.ToString())
 }
+
+func TestActionsConfigTokenPermissions(t *testing.T) {
+	t.Run("Default Permission Mode", func(t *testing.T) {
+		cfg := &ActionsConfig{}
+		assert.Equal(t, ActionsTokenPermissionModePermissive, cfg.GetTokenPermissionMode())
+	})
+
+	t.Run("Explicit Permission Mode", func(t *testing.T) {
+		cfg := &ActionsConfig{
+			TokenPermissionMode: ActionsTokenPermissionModeRestricted,
+		}
+		assert.Equal(t, ActionsTokenPermissionModeRestricted, cfg.GetTokenPermissionMode())
+	})
+
+	t.Run("Effective Permissions - Permissive Mode", func(t *testing.T) {
+		cfg := &ActionsConfig{
+			TokenPermissionMode: ActionsTokenPermissionModePermissive,
+		}
+		perms := cfg.GetEffectiveTokenPermissions(false)
+		assert.Equal(t, perm.AccessModeWrite, perms.Contents)
+		assert.Equal(t, perm.AccessModeWrite, perms.Issues)
+		assert.Equal(t, perm.AccessModeRead, perms.Packages) // Packages read by default for security
+	})
+
+	t.Run("Effective Permissions - Restricted Mode", func(t *testing.T) {
+		cfg := &ActionsConfig{
+			TokenPermissionMode: ActionsTokenPermissionModeRestricted,
+		}
+		perms := cfg.GetEffectiveTokenPermissions(false)
+		assert.Equal(t, perm.AccessModeRead, perms.Contents)
+		assert.Equal(t, perm.AccessModeRead, perms.Issues)
+		assert.Equal(t, perm.AccessModeRead, perms.Packages)
+	})
+
+	t.Run("Fork Pull Request Always Read-Only", func(t *testing.T) {
+		cfg := &ActionsConfig{
+			TokenPermissionMode: ActionsTokenPermissionModePermissive,
+		}
+		// Even with permissive mode, fork PRs get read-only
+		perms := cfg.GetEffectiveTokenPermissions(true)
+		assert.Equal(t, perm.AccessModeRead, perms.Contents)
+		assert.Equal(t, perm.AccessModeRead, perms.Issues)
+		assert.Equal(t, perm.AccessModeRead, perms.Packages)
+	})
+
+	t.Run("Clamp Permissions", func(t *testing.T) {
+		cfg := &ActionsConfig{
+			MaxTokenPermissions: &ActionsTokenPermissions{
+				Contents:     perm.AccessModeRead,
+				Issues:       perm.AccessModeWrite,
+				PullRequests: perm.AccessModeRead,
+				Packages:     perm.AccessModeRead,
+				Actions:      perm.AccessModeNone,
+				Wiki:         perm.AccessModeWrite,
+			},
+		}
+		input := ActionsTokenPermissions{
+			Contents:     perm.AccessModeWrite, // Should be clamped to Read
+			Issues:       perm.AccessModeWrite, // Should stay Write
+			PullRequests: perm.AccessModeWrite, // Should be clamped to Read
+			Packages:     perm.AccessModeWrite, // Should be clamped to Read
+			Actions:      perm.AccessModeRead,  // Should be clamped to None
+			Wiki:         perm.AccessModeRead,  // Should stay Read
+		}
+		clamped := cfg.ClampPermissions(input)
+		assert.Equal(t, perm.AccessModeRead, clamped.Contents)
+		assert.Equal(t, perm.AccessModeWrite, clamped.Issues)
+		assert.Equal(t, perm.AccessModeRead, clamped.PullRequests)
+		assert.Equal(t, perm.AccessModeRead, clamped.Packages)
+		assert.Equal(t, perm.AccessModeNone, clamped.Actions)
+		assert.Equal(t, perm.AccessModeRead, clamped.Wiki)
+	})
+}