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feat(oauth2): add RFC 8707 resource indicators and audience validation
Implements RFC 8707 Resource Indicators for OAuth2 provider to enable proper audience validation and token binding for multi-tenant scenarios. Key changes: - Add resource parameter support to authorization and token endpoints - Implement server-side audience validation for opaque tokens - Add database fields: ResourceUri (codes) and Audience (tokens) - Add comprehensive resource parameter validation logic - Add cross-resource audience validation in API middleware - Add extensive test coverage for RFC 8707 scenarios - Enhance PKCE implementation with timing attack protection This enables OAuth2 clients to specify target resource servers and prevents token abuse across different Coder deployments through proper audience binding. Change-Id: I3924cb2139e837e3ac0b0bd40a5aeb59637ebc1b Signed-off-by: Thomas Kosiewski <tk@coder.com>
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‎CLAUDE.md

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@@ -89,6 +89,10 @@ Read [cursor rules](.cursorrules).
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- Format: `{number}_{description}.{up|down}.sql`
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- Number must be unique and sequential
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- Always include both up and down migrations
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- **Use helper scripts**:
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- `./coderd/database/migrations/create_migration.sh "migration name"` - Creates new migration files
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- `./coderd/database/migrations/fix_migration_numbers.sh` - Renumbers migrations to avoid conflicts
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- `./coderd/database/migrations/create_fixture.sh "fixture name"` - Creates test fixtures for migrations
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2. **Update database queries**:
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- MUST DO! Any changes to database - adding queries, modifying queries should be done in the `coderd/database/queries/*.sql` files
@@ -125,6 +129,29 @@ Read [cursor rules](.cursorrules).
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4. Run `make gen` again
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5. Run `make lint` to catch any remaining issues
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### In-Memory Database Testing
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When adding new database fields:
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- **CRITICAL**: Update `coderd/database/dbmem/dbmem.go` in-memory implementations
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- The `Insert*` functions must include ALL new fields, not just basic ones
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- Common issue: Tests pass with real database but fail with in-memory database due to missing field mappings
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- Always verify in-memory database functions match the real database schema after migrations
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Example pattern:
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```go
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// In dbmem.go - ensure ALL fields are included
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code := database.OAuth2ProviderAppCode{
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ID: arg.ID,
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CreatedAt: arg.CreatedAt,
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// ... existing fields ...
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ResourceUri: arg.ResourceUri, // New field
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CodeChallenge: arg.CodeChallenge, // New field
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CodeChallengeMethod: arg.CodeChallengeMethod, // New field
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}
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```
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## Architecture
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### Core Components
@@ -209,6 +236,12 @@ When working on OAuth2 provider features:
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- Avoid dependency on referer headers for security decisions
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- Support proper state parameter validation
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6. **RFC 8707 Resource Indicators**:
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- Store resource parameters in database for server-side validation (opaque tokens)
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- Validate resource consistency between authorization and token requests
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- Support audience validation in refresh token flows
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- Resource parameter is optional but must be consistent when provided
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### OAuth2 Error Handling Pattern
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```go
@@ -265,3 +298,6 @@ Always run the full test suite after OAuth2 changes:
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4. **Missing newlines** - Ensure files end with newline character
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5. **Tests passing locally but failing in CI** - Check if `dbmem` implementation needs updating
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6. **OAuth2 endpoints returning wrong error format** - Ensure OAuth2 endpoints return RFC 6749 compliant errors
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7. **OAuth2 tests failing but scripts working** - Check in-memory database implementations in `dbmem.go`
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8. **Resource indicator validation failing** - Ensure database stores and retrieves resource parameters correctly
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9. **PKCE tests failing** - Verify both authorization code storage and token exchange handle PKCE fields

‎coderd/coderd.go

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@@ -781,6 +781,7 @@ func New(options *Options) *API {
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Optional: false,
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SessionTokenFunc: nil, // Default behavior
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PostAuthAdditionalHeadersFunc: options.PostAuthAdditionalHeadersFunc,
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Logger: options.Logger,
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})
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// Same as above but it redirects to the login page.
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apiKeyMiddlewareRedirect := httpmw.ExtractAPIKeyMW(httpmw.ExtractAPIKeyConfig{
@@ -791,6 +792,7 @@ func New(options *Options) *API {
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Optional: false,
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SessionTokenFunc: nil, // Default behavior
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PostAuthAdditionalHeadersFunc: options.PostAuthAdditionalHeadersFunc,
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Logger: options.Logger,
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})
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// Same as the first but it's optional.
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apiKeyMiddlewareOptional := httpmw.ExtractAPIKeyMW(httpmw.ExtractAPIKeyConfig{
@@ -801,6 +803,7 @@ func New(options *Options) *API {
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Optional: true,
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SessionTokenFunc: nil, // Default behavior
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PostAuthAdditionalHeadersFunc: options.PostAuthAdditionalHeadersFunc,
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Logger: options.Logger,
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})
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workspaceAgentInfo := httpmw.ExtractWorkspaceAgentAndLatestBuild(httpmw.ExtractWorkspaceAgentAndLatestBuildConfig{

‎coderd/database/dbauthz/dbauthz.go

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@@ -2181,6 +2181,25 @@ func (q *querier) GetOAuth2ProviderAppSecretsByAppID(ctx context.Context, appID
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return q.db.GetOAuth2ProviderAppSecretsByAppID(ctx, appID)
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}
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func (q *querier) GetOAuth2ProviderAppTokenByAPIKeyID(ctx context.Context, apiKeyID string) (database.OAuth2ProviderAppToken, error) {
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token, err := q.db.GetOAuth2ProviderAppTokenByAPIKeyID(ctx, apiKeyID)
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if err != nil {
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return database.OAuth2ProviderAppToken{}, err
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}
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// Get the associated API key to check ownership
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apiKey, err := q.db.GetAPIKeyByID(ctx, token.APIKeyID)
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if err != nil {
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return database.OAuth2ProviderAppToken{}, err
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}
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if err := q.authorizeContext(ctx, policy.ActionRead, rbac.ResourceOauth2AppCodeToken.WithOwner(apiKey.UserID.String())); err != nil {
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return database.OAuth2ProviderAppToken{}, err
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}
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return token, nil
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}
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func (q *querier) GetOAuth2ProviderAppTokenByPrefix(ctx context.Context, hashPrefix []byte) (database.OAuth2ProviderAppToken, error) {
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token, err := q.db.GetOAuth2ProviderAppTokenByPrefix(ctx, hashPrefix)
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if err != nil {

‎coderd/database/dbauthz/dbauthz_test.go

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@@ -5380,6 +5380,21 @@ func (s *MethodTestSuite) TestOAuth2ProviderAppTokens() {
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})
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check.Args(token.HashPrefix).Asserts(rbac.ResourceOauth2AppCodeToken.WithOwner(user.ID.String()), policy.ActionRead)
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}))
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s.Run("GetOAuth2ProviderAppTokenByAPIKeyID", s.Subtest(func(db database.Store, check *expects) {
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user := dbgen.User(s.T(), db, database.User{})
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key, _ := dbgen.APIKey(s.T(), db, database.APIKey{
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UserID: user.ID,
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})
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app := dbgen.OAuth2ProviderApp(s.T(), db, database.OAuth2ProviderApp{})
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secret := dbgen.OAuth2ProviderAppSecret(s.T(), db, database.OAuth2ProviderAppSecret{
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AppID: app.ID,
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})
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token := dbgen.OAuth2ProviderAppToken(s.T(), db, database.OAuth2ProviderAppToken{
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AppSecretID: secret.ID,
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APIKeyID: key.ID,
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})
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check.Args(token.APIKeyID).Asserts(rbac.ResourceOauth2AppCodeToken.WithOwner(user.ID.String()), policy.ActionRead).Returns(token)
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}))
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s.Run("DeleteOAuth2ProviderAppTokensByAppAndUserID", s.Subtest(func(db database.Store, check *expects) {
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dbtestutil.DisableForeignKeysAndTriggers(s.T(), db)
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user := dbgen.User(s.T(), db, database.User{})

‎coderd/database/dbmem/dbmem.go

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@@ -4054,6 +4054,19 @@ func (q *FakeQuerier) GetOAuth2ProviderAppSecretsByAppID(_ context.Context, appI
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return []database.OAuth2ProviderAppSecret{}, sql.ErrNoRows
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}
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func (q *FakeQuerier) GetOAuth2ProviderAppTokenByAPIKeyID(_ context.Context, apiKeyID string) (database.OAuth2ProviderAppToken, error) {
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q.mutex.Lock()
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defer q.mutex.Unlock()
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for _, token := range q.oauth2ProviderAppTokens {
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if token.APIKeyID == apiKeyID {
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return token, nil
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}
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}
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return database.OAuth2ProviderAppToken{}, sql.ErrNoRows
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}
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func (q *FakeQuerier) GetOAuth2ProviderAppTokenByPrefix(_ context.Context, hashPrefix []byte) (database.OAuth2ProviderAppToken, error) {
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q.mutex.Lock()
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defer q.mutex.Unlock()

‎coderd/database/dbmetrics/querymetrics.go

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‎coderd/database/dbmock/dbmock.go

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‎coderd/database/querier.go

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‎coderd/database/queries.sql.go

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‎coderd/database/queries/oauth2.sql

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@@ -136,6 +136,9 @@ INSERT INTO oauth2_provider_app_tokens (
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-- name: GetOAuth2ProviderAppTokenByPrefix :one
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SELECT * FROM oauth2_provider_app_tokens WHERE hash_prefix = $1;
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-- name: GetOAuth2ProviderAppTokenByAPIKeyID :one
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SELECT * FROM oauth2_provider_app_tokens WHERE api_key_id = $1;
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-- name: GetOAuth2ProviderAppsByUserID :many
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SELECT
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COUNT(DISTINCT oauth2_provider_app_tokens.id) as token_count,

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