respond with forbidden error if the user doesn't have access to an image

docs/todo.md

@@ -10,3 +10,4 @@
 - [ ] simple webui for managing the registry
 - [x] streaming layer bytes into providers
 - [x] streaming layer bytes from providers
+- [ ] better client error messages

src/api/blobs.rs

@@ -8,7 +8,7 @@ use axum::response::{IntoResponse, Response};
 use tokio_util::io::ReaderStream;
 
 use crate::app_state::AppState;
-use crate::auth::unauthenticated_response;
+use crate::auth::access_denied_response;
 use crate::dto::RepositoryVisibility;
 use crate::dto::user::{Permission, UserAuth};
 use crate::error::AppError;
@@ -17,7 +17,7 @@ pub async fn digest_exists_head(Path((name, layer_digest)): Path<(String, String
     // Check if the user has permission to pull, or that the repository is public
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PULL, Some(RepositoryVisibility::Public)).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
 
@@ -42,7 +42,7 @@ pub async fn pull_digest_get(Path((name, layer_digest)): Path<(String, String)>,
     // Check if the user has permission to pull, or that the repository is public
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PULL, Some(RepositoryVisibility::Public)).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
 

src/api/manifests.rs

@@ -7,7 +7,7 @@ use axum::http::{StatusCode, HeaderName, header};
 use tracing::log::warn;
 use tracing::{debug, info};
 
-use crate::auth::unauthenticated_response;
+use crate::auth::access_denied_response;
 use crate::app_state::AppState;
 use crate::database::Database;
 use crate::dto::RepositoryVisibility;
@@ -19,7 +19,7 @@ use crate::error::AppError;
 pub async fn upload_manifest_put(Path((name, reference)): Path<(String, String)>, state: State<Arc<AppState>>, Extension(auth): Extension<UserAuth>, body: String) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
 
@@ -68,7 +68,7 @@ pub async fn pull_manifest_get(Path((name, reference)): Path<(String, String)>,
     // Check if the user has permission to pull, or that the repository is public
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PULL, Some(RepositoryVisibility::Public)).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
     
@@ -111,7 +111,7 @@ pub async fn manifest_exists_head(Path((name, reference)): Path<(String, String)
     // Check if the user has permission to pull, or that the repository is public
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PULL, Some(RepositoryVisibility::Public)).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
     
@@ -151,7 +151,7 @@ pub async fn manifest_exists_head(Path((name, reference)): Path<(String, String)
 pub async fn delete_manifest(Path((name, reference)): Path<(String, String)>, state: State<Arc<AppState>>, Extension(auth): Extension<UserAuth>) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
 

src/api/uploads.rs

@@ -12,7 +12,7 @@ use futures::StreamExt;
 use tracing::{debug, warn};
 
 use crate::app_state::AppState;
-use crate::auth::unauthenticated_response;
+use crate::auth::access_denied_response;
 use crate::byte_stream::ByteStream;
 use crate::dto::user::{UserAuth, Permission};
 use crate::error::AppError;
@@ -35,14 +35,13 @@ pub async fn start_upload_post(Path((name, )): Path<(String, )>, Extension(auth)
         ).into_response());
     }
 
-    Ok(unauthenticated_response(&state.config))
+    Ok(access_denied_response(&state.config))
 }
 
 pub async fn chunked_upload_layer_patch(Path((name, layer_uuid)): Path<(String, String)>, Extension(auth): Extension<UserAuth>, state: State<Arc<AppState>>, mut body: BodyStream) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        debug!("user is not authenticated");
+        return Ok(access_denied_response(&state.config));
-        return Ok(unauthenticated_response(&state.config));
     }
     drop(auth_driver);
 
@@ -101,7 +100,7 @@ pub async fn chunked_upload_layer_patch(Path((name, layer_uuid)): Path<(String,
 pub async fn finish_chunked_upload_put(Path((name, layer_uuid)): Path<(String, String)>, Query(query): Query<HashMap<String, String>>, Extension(auth): Extension<UserAuth>, state: State<Arc<AppState>>, body: Bytes) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
     
@@ -130,7 +129,7 @@ pub async fn finish_chunked_upload_put(Path((name, layer_uuid)): Path<(String, S
 pub async fn cancel_upload_delete(Path((name, layer_uuid)): Path<(String, String)>, state: State<Arc<AppState>>, Extension(auth): Extension<UserAuth>) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
     
@@ -144,7 +143,7 @@ pub async fn cancel_upload_delete(Path((name, layer_uuid)): Path<(String, String
 pub async fn check_upload_status_get(Path((name, layer_uuid)): Path<(String, String)>, state: State<Arc<AppState>>, Extension(auth): Extension<UserAuth>) -> Result<Response, AppError> {
     let mut auth_driver = state.auth_checker.lock().await;
     if !auth_driver.user_has_permission(auth.user.username, name.clone(), Permission::PUSH, None).await? {
-        return Ok(unauthenticated_response(&state.config));
+        return Ok(access_denied_response(&state.config));
     }
     drop(auth_driver);
     

src/auth/mod.rs

@@ -130,6 +130,8 @@ pub async fn require_auth<B>(State(state): State<Arc<AppState>>, mut request: Re
     }
 }
 
+/// Creates a response with an Unauthorized (401) status code.
+/// The www-authenticate header is set to notify the client of where to authorize with.
 #[inline(always)]
 pub fn unauthenticated_response(config: &Config) -> Response {
     let bearer = format!("Bearer realm=\"{}/auth\"", config.get_url());
@@ -141,3 +143,15 @@ pub fn unauthenticated_response(config: &Config) -> Response {
         ]
     ).into_response()
 }
+
+/// Creates a response with a Forbidden (403) status code.
+/// No other headers are set.
+#[inline(always)]
+pub fn access_denied_response(config: &Config) -> Response {
+    (
+        StatusCode::FORBIDDEN,
+        [
+            ( HeaderName::from_static("docker-distribution-api-version"), "registry/2.0".to_string() )
+        ]
+    ).into_response()
+}