OIDC provider #33945
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,217 @@ | ||
| // Copyright 2025 The Gitea Authors. All rights reserved. | ||
| // SPDX-License-Identifier: MIT | ||
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| package actions | ||
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| import ( | ||
| "errors" | ||
| "fmt" | ||
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| "gopkg.in/yaml.v3" | ||
| ) | ||
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| type Permission int | ||
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| const ( | ||
| PermissionUnspecified Permission = iota | ||
| PermissionNone | ||
| PermissionRead | ||
| PermissionWrite | ||
| ) | ||
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| // 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"` | ||
| } | ||
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| // 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 | ||
| } | ||
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| // 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") | ||
| } | ||
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| func (p *Permission) UnmarshalYAML(unmarshal func(interface{}) error) error { | ||
| var data string | ||
| if err := unmarshal(&data); err != nil { | ||
| return err | ||
| } | ||
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| switch data { | ||
| case "none": | ||
| *p = PermissionNone | ||
| case "read": | ||
| *p = PermissionRead | ||
| case "write": | ||
| *p = PermissionWrite | ||
| default: | ||
| return fmt.Errorf("invalid permission: %s", data) | ||
| } | ||
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| return nil | ||
| } | ||
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| // 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, | ||
| } | ||
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| // 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, | ||
| } | ||
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| 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, | ||
| } | ||
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| 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, | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
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| func merge[T comparable](a, b T) T { | ||
| var zero T | ||
| if a == zero { | ||
| return b | ||
| } | ||
| return a | ||
| } | ||
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| // 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) | ||
| } | ||
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