Add support for SUBSCRIBE_EVENT_TYPES

Signed-off-by: Steven Bellock <[email protected]>

include/hal/library/eventlib.h

@@ -38,5 +38,29 @@ extern bool libspdm_event_get_types(
     void *supported_event_groups_list,
     uint32_t *supported_event_groups_list_len,
     uint8_t *event_group_count);
+
+/**
+ * Subscribe to the events given in SubscribeList.
+ *
+ * If subscribe_event_group_count is 0 then the event recipient unsubscribes from all events and
+ * subscribe_list_len is 0 and subscribe_list is NULL. For a given event group, if
+ * SPDM_SUBSCRIBE_EVENT_TYPES_REQUEST_ATTRIBUTE_ALL is set in the Attributes field then the event
+ * recipient subscribes to all events in that group.
+ *
+ * @param  spdm_context                 A pointer to the SPDM context.
+ * @param  spdm_version                 Indicates the negotiated version.
+ * @param  subscribe_event_group_count  Number of event groups in subscribe_list.
+ * @param  subscribe_list_len           Size, in bytes, of subscribe_list.
+ * @param  subscribe_list               Buffer that contains the event groups to be subscribed.
+ *
+ * @retval true   All events were successfully subscribed or unsubscribed to.
+ * @retval false  An error occurred when processing the event group list.
+ **/
+extern bool libspdm_event_subscribe(
+    void *spdm_context,
+    spdm_version_number_t spdm_version,
+    uint8_t subscribe_event_group_count,
+    uint32_t subscribe_list_len,
+    const void *subscribe_list);
 #endif /* LIBSPDM_ENABLE_CAPABILITY_EVENT_CAP */
 #endif /* EVENTLIB_H */

include/industry_standard/spdm.h

@@ -56,6 +56,7 @@
 
 /* SPDM response code (1.3) */
 #define SPDM_SUPPORTED_EVENT_TYPES 0x62
+#define SPDM_SUBSCRIBE_EVENT_TYPES_ACK 0x70
 #define SPDM_MEASUREMENT_EXTENSION_LOG 0x6F
 #define SPDM_KEY_PAIR_INFO 0x7C
 
@@ -89,6 +90,7 @@
 
 /* SPDM request code (1.3) */
 #define SPDM_GET_SUPPORTED_EVENT_TYPES 0xE2
+#define SPDM_SUBSCRIBE_EVENT_TYPES 0xF0
 #define SPDM_GET_MEASUREMENT_EXTENSION_LOG 0xEF
 #define SPDM_GET_KEY_PAIR_INFO 0xFC
 
@@ -1197,6 +1199,22 @@ typedef struct {
     /* uint8_t supported_event_groups_list[supported_event_groups_list_len] */
 } spdm_supported_event_types_response_t;
 
+typedef struct {
+    spdm_message_header_t header;
+    /* param1 == SubscribeEventGroupCount
+     * param2 == RSVD */
+    uint32_t subscribe_list_len;
+    /* uint8_t subscribe_list[subscribe_list_len] */
+} spdm_subscribe_event_types_request_t;
+
+#define SPDM_SUBSCRIBE_EVENT_TYPES_REQUEST_ATTRIBUTE_ALL (1 << 0)
+
+typedef struct {
+    spdm_message_header_t header;
+    /* param1 == RSVD
+     * param2 == RSVD */
+} spdm_subscribe_event_types_ack_response_t;
+
 /* SPDM GET_MEASUREMENT_EXTENSION_LOG request */
 typedef struct {
     spdm_message_header_t header;

include/internal/libspdm_responder_lib.h

@@ -778,14 +778,19 @@ libspdm_return_t libspdm_get_response_chunk_send(libspdm_context_t *spdm_context
 #endif /* LIBSPDM_ENABLE_CAPABILITY_CHUNK_CAP */
 
 #if LIBSPDM_ENABLE_CAPABILITY_EVENT_CAP
-/**
- * Process the SPDM GET_SUPPORTED_EVENT_TYPES request and return the response.
- **/
+/* Process the SPDM GET_SUPPORTED_EVENT_TYPES request and return the response. */
 libspdm_return_t libspdm_get_response_supported_event_types(libspdm_context_t *spdm_context,
                                                             size_t request_size,
                                                             const void *request,
                                                             size_t *response_size,
                                                             void *response);
+
+/* Process the SPDM SUBSCRIBE_EVENT_TYPES request and return the response. */
+libspdm_return_t libspdm_get_response_subscribe_event_types_ack(libspdm_context_t *spdm_context,
+                                                                size_t request_size,
+                                                                const void *request,
+                                                                size_t *response_size,
+                                                                void *response);
 #endif /* LIBSPDM_ENABLE_CAPABILITY_EVENT_CAP */
 
 #if LIBSPDM_ENABLE_VENDOR_DEFINED_MESSAGES

include/library/spdm_requester_lib.h

@@ -847,6 +847,25 @@ libspdm_return_t libspdm_get_event_types(void *spdm_context,
                                          uint8_t *event_group_count,
                                          uint32_t *supported_event_groups_list_len,
                                          void *supported_event_groups_list);
+
+/** This function subscribes to the specified event types.
+ *
+ *  This function can only be called after a secure session has been established with the device.
+ *
+ *  @param  spdm_context       A pointer to the SPDM context.
+ *  @param  session_id         The session ID of the session.
+ *  @param  subscribe_event_group_count The number of event groups in subscribe_list. If this value
+ *                                      is 0 then subscription to all events will be cleared and
+ *                                      subscribe_list_len must be 0 and subscribe_list must be
+ *                                      NULL.
+ *  @param  subscribe_list_len The size, in bytes, of subscribe_list.
+ *  @param  subscribe_list     List of event types and event groups.
+ **/
+libspdm_return_t libspdm_subscribe_event_types(void *spdm_context,
+                                               uint32_t session_id,
+                                               uint8_t subscribe_event_group_count,
+                                               uint32_t subscribe_list_len,
+                                               void *subscribe_list);
 #endif /* LIBSPDM_EVENT_RECIPIENT_SUPPORT */
 
 #if LIBSPDM_ENABLE_MSG_LOG

library/spdm_requester_lib/CMakeLists.txt

@@ -24,6 +24,7 @@ target_sources(spdm_requester_lib
         libspdm_req_get_certificate.c
         libspdm_req_get_digests.c
         libspdm_req_get_event_types.c
+        libspdm_req_subscribe_event_types.c
         libspdm_req_get_measurements.c
         libspdm_req_get_version.c
         libspdm_req_handle_error_response.c

library/spdm_requester_lib/libspdm_req_subscribe_event_types.c

@@ -0,0 +1,182 @@
+/**
+ *  Copyright Notice:
+ *  Copyright 2024 DMTF. All rights reserved.
+ *  License: BSD 3-Clause License. For full text see link: https://github.com/DMTF/libspdm/blob/main/LICENSE.md
+ **/
+
+#include "internal/libspdm_requester_lib.h"
+
+#if LIBSPDM_EVENT_RECIPIENT_SUPPORT
+
+static libspdm_return_t try_libspdm_subscribe_event_types(libspdm_context_t *spdm_context,
+                                                          uint32_t session_id,
+                                                          uint8_t subscribe_event_group_count,
+                                                          uint32_t subscribe_list_len,
+                                                          void *subscribe_list)
+{
+    libspdm_return_t status;
+    libspdm_session_info_t *session_info;
+    spdm_subscribe_event_types_request_t *spdm_request;
+    size_t spdm_request_size;
+    spdm_supported_event_types_response_t *spdm_response;
+    size_t spdm_response_size;
+    size_t transport_header_size;
+    uint8_t *message;
+    size_t message_size;
+
+    /* -=[Check Parameters Phase]=- */
+    if (subscribe_event_group_count == 0) {
+        if ((subscribe_list_len != 0) || (subscribe_list != NULL)) {
+            return LIBSPDM_STATUS_INVALID_PARAMETER;
+        }
+    } else {
+        if ((subscribe_list_len == 0) || (subscribe_list == NULL)) {
+            return LIBSPDM_STATUS_INVALID_PARAMETER;
+        }
+    }
+
+    session_info = libspdm_get_session_info_via_session_id(spdm_context, session_id);
+
+    if (session_info == NULL) {
+        LIBSPDM_ASSERT(false);
+        return LIBSPDM_STATUS_INVALID_STATE_LOCAL;
+    }
+    if (libspdm_secured_message_get_session_state(session_info->secured_message_context) !=
+        LIBSPDM_SESSION_STATE_ESTABLISHED) {
+        return LIBSPDM_STATUS_INVALID_STATE_LOCAL;
+    }
+
+    /* -=[Verify State Phase]=- */
+    if (libspdm_get_connection_version(spdm_context) < SPDM_MESSAGE_VERSION_13) {
+        return LIBSPDM_STATUS_UNSUPPORTED_CAP;
+    }
+    if (!libspdm_is_capabilities_flag_supported(
+            spdm_context, true, 0,
+            SPDM_GET_CAPABILITIES_RESPONSE_FLAGS_EVENT_CAP)) {
+        return LIBSPDM_STATUS_UNSUPPORTED_CAP;
+    }
+
+    /* -=[Construct Request Phase]=- */
+    transport_header_size = spdm_context->local_context.capability.transport_header_size;
+    status = libspdm_acquire_sender_buffer (spdm_context, &message_size, (void **)&message);
+    if (LIBSPDM_STATUS_IS_ERROR(status)) {
+        return status;
+    }
+    LIBSPDM_ASSERT (message_size >= transport_header_size +
+                    spdm_context->local_context.capability.transport_tail_size);
+    spdm_request = (void *)(message + transport_header_size);
+    spdm_request_size = message_size - transport_header_size -
+                        spdm_context->local_context.capability.transport_tail_size;
+    LIBSPDM_ASSERT (spdm_request_size >= sizeof(spdm_subscribe_event_types_request_t));
+
+    if (spdm_request_size < sizeof(spdm_request->header)) {
+        libspdm_release_sender_buffer(spdm_context);
+        return LIBSPDM_STATUS_BUFFER_TOO_SMALL;
+    }
+
+    spdm_request->header.spdm_version = libspdm_get_connection_version(spdm_context);
+    spdm_request->header.request_response_code = SPDM_SUBSCRIBE_EVENT_TYPES;
+    spdm_request->header.param1 = subscribe_event_group_count;
+    spdm_request->header.param2 = 0;
+
+    if (subscribe_event_group_count == 0) {
+        spdm_request_size = sizeof(spdm_request->header);
+    } else {
+        if (spdm_request_size < sizeof(spdm_subscribe_event_types_request_t) + subscribe_list_len) {
+            libspdm_release_sender_buffer(spdm_context);
+            return LIBSPDM_STATUS_BUFFER_TOO_SMALL;
+        }
+
+        spdm_request_size = sizeof(spdm_subscribe_event_types_request_t) + subscribe_list_len;
+        spdm_request->subscribe_list_len = subscribe_list_len;
+        libspdm_copy_mem(spdm_request + 1,
+                            spdm_request_size - sizeof(spdm_subscribe_event_types_request_t),
+                            subscribe_list,
+                            subscribe_list_len);
+    }
+
+    /* -=[Send Request Phase]=- */
+    status = libspdm_send_spdm_request(spdm_context, &session_id, spdm_request_size, spdm_request);
+    if (LIBSPDM_STATUS_IS_ERROR(status)) {
+        libspdm_release_sender_buffer (spdm_context);
+        return status;
+    }
+
+    libspdm_release_sender_buffer(spdm_context);
+    spdm_request = (void *)spdm_context->last_spdm_request;
+
+    /* -=[Receive Response Phase]=- */
+    status = libspdm_acquire_receiver_buffer(spdm_context, &message_size, (void **)&message);
+    if (LIBSPDM_STATUS_IS_ERROR(status)) {
+        return status;
+    }
+    LIBSPDM_ASSERT (message_size >= transport_header_size);
+    spdm_response = (void *)(message);
+    spdm_response_size = message_size;
+
+    status = libspdm_receive_spdm_response(
+        spdm_context, &session_id, &spdm_response_size, (void **)&spdm_response);
+    if (LIBSPDM_STATUS_IS_ERROR(status)) {
+        goto receive_done;
+    }
+
+    /* -=[Validate Response Phase]=- */
+    if (spdm_response_size != sizeof(spdm_subscribe_event_types_ack_response_t)) {
+        status = LIBSPDM_STATUS_INVALID_MSG_SIZE;
+        goto receive_done;
+    }
+    if (spdm_response->header.spdm_version != spdm_request->header.spdm_version) {
+        status = LIBSPDM_STATUS_INVALID_MSG_FIELD;
+        goto receive_done;
+    }
+    if (spdm_response->header.request_response_code == SPDM_ERROR) {
+        status = libspdm_handle_error_response_main(
+            spdm_context, &session_id,
+            &spdm_response_size, (void **)&spdm_response,
+            SPDM_SUBSCRIBE_EVENT_TYPES, SPDM_SUBSCRIBE_EVENT_TYPES_ACK);
+        if (LIBSPDM_STATUS_IS_ERROR(status)) {
+            goto receive_done;
+        }
+    } else if (spdm_response->header.request_response_code != SPDM_SUBSCRIBE_EVENT_TYPES_ACK) {
+        status = LIBSPDM_STATUS_INVALID_MSG_FIELD;
+        goto receive_done;
+    }
+
+receive_done:
+    libspdm_release_receiver_buffer(spdm_context);
+
+    return status;
+}
+
+libspdm_return_t libspdm_subscribe_event_types(void *spdm_context,
+                                               uint32_t session_id,
+                                               uint8_t subscribe_event_group_count,
+                                               uint32_t subscribe_list_len,
+                                               void *subscribe_list)
+{
+    size_t retry;
+    uint64_t retry_delay_time;
+    libspdm_return_t status;
+    libspdm_context_t *context;
+
+    context = spdm_context;
+    context->crypto_request = true;
+    retry = context->retry_times;
+    retry_delay_time = context->retry_delay_time;
+    do {
+        status = try_libspdm_subscribe_event_types(context,
+                                                   session_id,
+                                                   subscribe_event_group_count,
+                                                   subscribe_list_len,
+                                                   subscribe_list);
+        if ((status != LIBSPDM_STATUS_BUSY_PEER) || (retry == 0)) {
+            return status;
+        }
+
+        libspdm_sleep(retry_delay_time);
+    } while (retry-- != 0);
+
+    return status;
+}
+
+#endif /* LIBSPDM_EVENT_RECIPIENT_SUPPORT */

library/spdm_responder_lib/CMakeLists.txt

@@ -37,6 +37,7 @@ target_sources(spdm_responder_lib
         libspdm_rsp_version.c
         libspdm_rsp_set_certificate.c
         libspdm_rsp_supported_event_types.c
+        libspdm_rsp_subscribe_event_types_ack.c
         libspdm_rsp_csr.c
         libspdm_rsp_chunk_send_ack.c
         libspdm_rsp_chunk_get.c

library/spdm_responder_lib/libspdm_rsp_receive_send.c

@@ -95,6 +95,7 @@ libspdm_get_spdm_response_func libspdm_get_response_func_via_request_code(uint8_
 
         #if LIBSPDM_ENABLE_CAPABILITY_EVENT_CAP
         { SPDM_SUPPORTED_EVENT_TYPES, libspdm_get_response_supported_event_types },
+        { SPDM_SUBSCRIBE_EVENT_TYPES, libspdm_get_response_subscribe_event_types_ack },
         #endif /* LIBSPDM_ENABLE_CAPABILITY_EVENT_CAP */
 
         #if LIBSPDM_ENABLE_VENDOR_DEFINED_MESSAGES