forgejo-federation/modules/context/permission.go
Jack Hay 18de83b2a3
Redesign Scoped Access Tokens (#24767)
## Changes
- Adds the following high level access scopes, each with `read` and
`write` levels:
    - `activitypub`
    - `admin` (hidden if user is not a site admin)
    - `misc`
    - `notification`
    - `organization`
    - `package`
    - `issue`
    - `repository`
    - `user`
- Adds new middleware function `tokenRequiresScopes()` in addition to
`reqToken()`
  -  `tokenRequiresScopes()` is used for each high-level api section
- _if_ a scoped token is present, checks that the required scope is
included based on the section and HTTP method
  - `reqToken()` is used for individual routes
- checks that required authentication is present (but does not check
scope levels as this will already have been handled by
`tokenRequiresScopes()`
- Adds migration to convert old scoped access tokens to the new set of
scopes
- Updates the user interface for scope selection

### User interface example
<img width="903" alt="Screen Shot 2023-05-31 at 1 56 55 PM"
src="https://github.com/go-gitea/gitea/assets/23248839/654766ec-2143-4f59-9037-3b51600e32f3">
<img width="917" alt="Screen Shot 2023-05-31 at 1 56 43 PM"
src="https://github.com/go-gitea/gitea/assets/23248839/1ad64081-012c-4a73-b393-66b30352654c">

## tokenRequiresScopes  Design Decision
- `tokenRequiresScopes()` was added to more reliably cover api routes.
For an incoming request, this function uses the given scope category
(say `AccessTokenScopeCategoryOrganization`) and the HTTP method (say
`DELETE`) and verifies that any scoped tokens in use include
`delete:organization`.
- `reqToken()` is used to enforce auth for individual routes that
require it. If a scoped token is not present for a request,
`tokenRequiresScopes()` will not return an error

## TODO
- [x] Alphabetize scope categories
- [x] Change 'public repos only' to a radio button (private vs public).
Also expand this to organizations
- [X] Disable token creation if no scopes selected. Alternatively, show
warning
- [x] `reqToken()` is missing from many `POST/DELETE` routes in the api.
`tokenRequiresScopes()` only checks that a given token has the correct
scope, `reqToken()` must be used to check that a token (or some other
auth) is present.
   -  _This should be addressed in this PR_
- [x] The migration should be reviewed very carefully in order to
minimize access changes to existing user tokens.
   - _This should be addressed in this PR_
- [x] Link to api to swagger documentation, clarify what
read/write/delete levels correspond to
- [x] Review cases where more than one scope is needed as this directly
deviates from the api definition.
   - _This should be addressed in this PR_
   - For example: 
   ```go
	m.Group("/users/{username}/orgs", func() {
		m.Get("", reqToken(), org.ListUserOrgs)
		m.Get("/{org}/permissions", reqToken(), org.GetUserOrgsPermissions)
}, tokenRequiresScopes(auth_model.AccessTokenScopeCategoryUser,
auth_model.AccessTokenScopeCategoryOrganization),
context_service.UserAssignmentAPI())
   ```

## Future improvements
- [ ] Add required scopes to swagger documentation
- [ ] Redesign `reqToken()` to be opt-out rather than opt-in
- [ ] Subdivide scopes like `repository`
- [ ] Once a token is created, if it has no scopes, we should display
text instead of an empty bullet point
- [ ] If the 'public repos only' option is selected, should read
categories be selected by default

Closes #24501
Closes #24799

Co-authored-by: Jonathan Tran <jon@allspice.io>
Co-authored-by: Kyle D <kdumontnu@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
2023-06-04 20:57:16 +02:00

149 lines
4 KiB
Go

// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"net/http"
auth_model "code.gitea.io/gitea/models/auth"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/models/unit"
"code.gitea.io/gitea/modules/log"
)
// RequireRepoAdmin returns a middleware for requiring repository admin permission
func RequireRepoAdmin() func(ctx *Context) {
return func(ctx *Context) {
if !ctx.IsSigned || !ctx.Repo.IsAdmin() {
ctx.NotFound(ctx.Req.URL.RequestURI(), nil)
return
}
}
}
// RequireRepoWriter returns a middleware for requiring repository write to the specify unitType
func RequireRepoWriter(unitType unit.Type) func(ctx *Context) {
return func(ctx *Context) {
if !ctx.Repo.CanWrite(unitType) {
ctx.NotFound(ctx.Req.URL.RequestURI(), nil)
return
}
}
}
// CanEnableEditor checks if the user is allowed to write to the branch of the repo
func CanEnableEditor() func(ctx *Context) {
return func(ctx *Context) {
if !ctx.Repo.CanWriteToBranch(ctx.Doer, ctx.Repo.BranchName) {
ctx.NotFound("CanWriteToBranch denies permission", nil)
return
}
}
}
// RequireRepoWriterOr returns a middleware for requiring repository write to one of the unit permission
func RequireRepoWriterOr(unitTypes ...unit.Type) func(ctx *Context) {
return func(ctx *Context) {
for _, unitType := range unitTypes {
if ctx.Repo.CanWrite(unitType) {
return
}
}
ctx.NotFound(ctx.Req.URL.RequestURI(), nil)
}
}
// RequireRepoReader returns a middleware for requiring repository read to the specify unitType
func RequireRepoReader(unitType unit.Type) func(ctx *Context) {
return func(ctx *Context) {
if !ctx.Repo.CanRead(unitType) {
if log.IsTrace() {
if ctx.IsSigned {
log.Trace("Permission Denied: User %-v cannot read %-v in Repo %-v\n"+
"User in Repo has Permissions: %-+v",
ctx.Doer,
unitType,
ctx.Repo.Repository,
ctx.Repo.Permission)
} else {
log.Trace("Permission Denied: Anonymous user cannot read %-v in Repo %-v\n"+
"Anonymous user in Repo has Permissions: %-+v",
unitType,
ctx.Repo.Repository,
ctx.Repo.Permission)
}
}
ctx.NotFound(ctx.Req.URL.RequestURI(), nil)
return
}
}
}
// RequireRepoReaderOr returns a middleware for requiring repository write to one of the unit permission
func RequireRepoReaderOr(unitTypes ...unit.Type) func(ctx *Context) {
return func(ctx *Context) {
for _, unitType := range unitTypes {
if ctx.Repo.CanRead(unitType) {
return
}
}
if log.IsTrace() {
var format string
var args []interface{}
if ctx.IsSigned {
format = "Permission Denied: User %-v cannot read ["
args = append(args, ctx.Doer)
} else {
format = "Permission Denied: Anonymous user cannot read ["
}
for _, unit := range unitTypes {
format += "%-v, "
args = append(args, unit)
}
format = format[:len(format)-2] + "] in Repo %-v\n" +
"User in Repo has Permissions: %-+v"
args = append(args, ctx.Repo.Repository, ctx.Repo.Permission)
log.Trace(format, args...)
}
ctx.NotFound(ctx.Req.URL.RequestURI(), nil)
}
}
// CheckRepoScopedToken check whether personal access token has repo scope
func CheckRepoScopedToken(ctx *Context, repo *repo_model.Repository, level auth_model.AccessTokenScopeLevel) {
if !ctx.IsBasicAuth || ctx.Data["IsApiToken"] != true {
return
}
scope, ok := ctx.Data["ApiTokenScope"].(auth_model.AccessTokenScope)
if ok { // it's a personal access token but not oauth2 token
var scopeMatched bool
requiredScopes := auth_model.GetRequiredScopes(level, auth_model.AccessTokenScopeCategoryRepository)
// check if scope only applies to public resources
publicOnly, err := scope.PublicOnly()
if err != nil {
ctx.ServerError("HasScope", err)
return
}
if publicOnly && repo.IsPrivate {
ctx.Error(http.StatusForbidden)
return
}
scopeMatched, err = scope.HasScope(requiredScopes...)
if err != nil {
ctx.ServerError("HasScope", err)
return
}
if !scopeMatched {
ctx.Error(http.StatusForbidden)
return
}
}
}