S3Express CreateSession Allowlist Headers (#492)

Author: waahm7

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  BUILDER_VERSION: v0.9.72
+  BUILDER_VERSION: v0.9.74
   BUILDER_SOURCE: releases
   BUILDER_HOST: https://d19elf31gohf1l.cloudfront.net
   PACKAGE_NAME: aws-c-s3

.github/workflows/codecov.yml

@@ -5,7 +5,7 @@ on:
 
 
 env:
-  BUILDER_VERSION: v0.9.72
+  BUILDER_VERSION: v0.9.74
   BUILDER_SOURCE: releases
   BUILDER_HOST: https://d19elf31gohf1l.cloudfront.net
   PACKAGE_NAME: aws-c-s3
@@ -30,4 +30,4 @@ jobs:
       run: |
         python3 -c "from urllib.request import urlretrieve; urlretrieve('${{ env.BUILDER_HOST }}/${{ env.BUILDER_SOURCE }}/${{ env.BUILDER_VERSION }}/builder.pyz?run=${{ env.RUN }}', 'builder')"
         chmod a+x builder
-        ./builder build -p ${{ env.PACKAGE_NAME }} --compiler=gcc-12 --cmake-extra=-DASSERT_LOCK_HELD=ON --coverage --coverage-exclude=source/s3_copy_object.c
+        ./builder build -p ${{ env.PACKAGE_NAME }} --compiler=gcc --cmake-extra=-DASSERT_LOCK_HELD=ON --coverage --coverage-exclude=source/s3_copy_object.c

include/aws/s3/private/s3_request_messages.h

@@ -167,6 +167,12 @@ extern const size_t g_s3_complete_multipart_upload_excluded_headers_count;
 AWS_S3_API
 extern const struct aws_byte_cursor g_s3_abort_multipart_upload_excluded_headers[];
 
+AWS_S3_API
+extern const size_t g_s3_create_session_allowed_headers_count;
+
+AWS_S3_API
+extern const struct aws_byte_cursor g_s3_create_session_allowed_headers[];
+
 AWS_S3_API
 extern const size_t g_s3_abort_multipart_upload_excluded_headers_count;
 

include/aws/s3/private/s3express_credentials_provider_impl.h

@@ -26,6 +26,8 @@ struct aws_s3express_session {
     /* The region and host of the session */
     struct aws_string *region;
     struct aws_string *host;
+
+    struct aws_http_headers *headers;
     bool inactive;
 
     /* Only used for mock tests */
@@ -105,14 +107,19 @@ struct aws_s3express_credentials_provider *aws_s3express_credentials_provider_ne
     const struct aws_s3express_credentials_provider_default_options *options);
 
 /**
- * Encode the hash key to be [host_value][hash_of_credentials]
- * hash_of_credentials is the sha256 of [access_key][secret_access_key]
+ * Encodes the hash key in the format: [host_value][hash_of_credentials_and_headers]
+ *
+ * The hash_of_credentials_and_headers is calculated as follows:
+ * 1. Concatenate: [access_key][secret_access_key][headers]
+ *    where headers = ",header_name1:header_value1,header_name2:header_value2..."
+ * 2. Generates SHA256 hash of the concatenated string
  */
 AWS_S3_API
 struct aws_string *aws_encode_s3express_hash_key_new(
     struct aws_allocator *allocator,
     const struct aws_credentials *original_credentials,
-    struct aws_byte_cursor host_value);
+    struct aws_byte_cursor host_value,
+    struct aws_http_headers *headers);
 
 AWS_EXTERN_C_END
 #endif /* AWS_S3EXPRESS_CREDENTIALS_PROVIDER_IMPL_H */

include/aws/s3/s3_client.h

@@ -552,6 +552,10 @@ struct aws_s3_client_config {
      * If set, client will invoke the factory to get the provider to use, when needed.
      *
      * If not set, client will create a default S3 Express provider under the hood.
+     *
+     * NOTE: THE FOLLOWING BEHAVIOR IS EXPERIMENTAL AND UNSTABLE
+     * Default S3 Express provider will pass the headers allowed in `g_s3_create_session_allowed_headers` to the
+     * CreateSession call.
      */
     aws_s3express_provider_factory_fn *s3express_provider_override_factory;
     void *factory_user_data;

include/aws/s3/s3express_credentials_provider.h

@@ -27,6 +27,8 @@ struct aws_credentials_properties_s3express {
      * If empty, the region of the S3 client will be used.
      */
     struct aws_byte_cursor region;
+
+    struct aws_http_headers *headers;
 };
 
 struct aws_s3express_credentials_provider_vtable {

source/s3_client.c

@@ -1030,6 +1030,7 @@ struct aws_s3_meta_request *aws_s3_client_make_meta_request(
             }
 
             endpoint_host_name = aws_string_new_from_cursor(client->allocator, aws_uri_host_name(&host_uri));
+            port = aws_uri_port(&host_uri);
             aws_uri_clean_up(&host_uri);
         }
 

source/s3_meta_request.c

@@ -968,6 +968,7 @@ void aws_s3_meta_request_sign_request_default_impl(
         context->user_data = user_data;
         context->properties.host = aws_byte_cursor_from_string(meta_request->s3express_session_host);
         context->properties.region = signing_config.region;
+        context->properties.headers = aws_http_message_get_headers(meta_request->initial_request_message);
 
         if (signing_config.credentials) {
             context->original_credentials = signing_config.credentials;

source/s3_request_messages.c

@@ -27,6 +27,7 @@ const struct aws_byte_cursor g_s3_create_multipart_upload_excluded_headers[] = {
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-checksum-sha1"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-checksum-sha256"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("if-none-match"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const size_t g_s3_create_multipart_upload_excluded_headers_count =
@@ -62,6 +63,7 @@ const struct aws_byte_cursor g_s3_upload_part_excluded_headers[] = {
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-checksum-sha1"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-checksum-sha256"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("if-none-match"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const size_t g_s3_upload_part_excluded_headers_count = AWS_ARRAY_SIZE(g_s3_upload_part_excluded_headers);
@@ -96,6 +98,7 @@ const struct aws_byte_cursor g_s3_complete_multipart_upload_excluded_headers[] =
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source-range"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-mp-object-size"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const size_t g_s3_complete_multipart_upload_excluded_headers_count =
@@ -131,6 +134,7 @@ const struct aws_byte_cursor g_s3_complete_multipart_upload_with_checksum_exclud
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source-range"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-sdk-checksum-algorithm"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-mp-object-size"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const struct aws_byte_cursor g_s3_list_parts_excluded_headers[] = {
@@ -162,6 +166,7 @@ const struct aws_byte_cursor g_s3_list_parts_excluded_headers[] = {
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-object-lock-legal-hold"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source-range"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const size_t g_s3_list_parts_excluded_headers_count = AWS_ARRAY_SIZE(g_s3_list_parts_excluded_headers);
@@ -192,6 +197,7 @@ const struct aws_byte_cursor g_s3_list_parts_with_checksum_excluded_headers[] =
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-object-lock-legal-hold"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source-range"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
 const size_t g_s3_list_parts_with_checksum_excluded_headers_count =
@@ -227,8 +233,19 @@ const struct aws_byte_cursor g_s3_abort_multipart_upload_excluded_headers[] = {
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-copy-source-range"),
     AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("if-none-match"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
 };
 
+const struct aws_byte_cursor g_s3_create_session_allowed_headers[] = {
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-create-session-mode"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-server-side-encryption"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-server-side-encryption-aws-kms-key-id"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-server-side-encryption-context"),
+    AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-server-side-encryption-bucket-key-enabled"),
+};
+
+const size_t g_s3_create_session_allowed_headers_count = AWS_ARRAY_SIZE(g_s3_create_session_allowed_headers);
+
 static const struct aws_byte_cursor s_x_amz_meta_prefix = AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("x-amz-meta-");
 
 static const struct aws_byte_cursor s_checksum_type_header =