| /* |
| * |
| * Copyright 2015-2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "src/core/security/handshake.h" |
| |
| #include <string.h> |
| |
| #include "src/core/security/security_context.h" |
| #include "src/core/security/secure_endpoint.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/slice_buffer.h> |
| |
| #define GRPC_INITIAL_HANDSHAKE_BUFFER_SIZE 256 |
| |
| typedef struct { |
| grpc_security_connector *connector; |
| tsi_handshaker *handshaker; |
| unsigned char *handshake_buffer; |
| size_t handshake_buffer_size; |
| grpc_endpoint *wrapped_endpoint; |
| grpc_endpoint *secure_endpoint; |
| gpr_slice_buffer left_overs; |
| gpr_slice_buffer incoming; |
| gpr_slice_buffer outgoing; |
| grpc_security_handshake_done_cb cb; |
| void *user_data; |
| grpc_closure on_handshake_data_sent_to_peer; |
| grpc_closure on_handshake_data_received_from_peer; |
| grpc_auth_context *auth_context; |
| } grpc_security_handshake; |
| |
| static void on_handshake_data_received_from_peer(grpc_exec_ctx *exec_ctx, |
| void *setup, bool success); |
| |
| static void on_handshake_data_sent_to_peer(grpc_exec_ctx *exec_ctx, void *setup, |
| bool success); |
| |
| static void security_connector_remove_handshake(grpc_security_handshake *h) { |
| grpc_security_connector_handshake_list *node; |
| grpc_security_connector_handshake_list *tmp; |
| grpc_security_connector *sc = h->connector; |
| gpr_mu_lock(&sc->mu); |
| node = sc->handshaking_handshakes; |
| if (node && node->handshake == h) { |
| sc->handshaking_handshakes = node->next; |
| gpr_free(node); |
| gpr_mu_unlock(&sc->mu); |
| return; |
| } |
| while (node) { |
| if (node->next->handshake == h) { |
| tmp = node->next; |
| node->next = node->next->next; |
| gpr_free(tmp); |
| gpr_mu_unlock(&sc->mu); |
| return; |
| } |
| node = node->next; |
| } |
| gpr_mu_unlock(&sc->mu); |
| } |
| |
| static void security_handshake_done(grpc_exec_ctx *exec_ctx, |
| grpc_security_handshake *h, |
| int is_success) { |
| if (!h->connector->is_client_side) { |
| security_connector_remove_handshake(h); |
| } |
| if (is_success) { |
| h->cb(exec_ctx, h->user_data, GRPC_SECURITY_OK, h->secure_endpoint, |
| h->auth_context); |
| } else { |
| if (h->secure_endpoint != NULL) { |
| grpc_endpoint_shutdown(exec_ctx, h->secure_endpoint); |
| grpc_endpoint_destroy(exec_ctx, h->secure_endpoint); |
| } else { |
| grpc_endpoint_destroy(exec_ctx, h->wrapped_endpoint); |
| } |
| h->cb(exec_ctx, h->user_data, GRPC_SECURITY_ERROR, NULL, NULL); |
| } |
| if (h->handshaker != NULL) tsi_handshaker_destroy(h->handshaker); |
| if (h->handshake_buffer != NULL) gpr_free(h->handshake_buffer); |
| gpr_slice_buffer_destroy(&h->left_overs); |
| gpr_slice_buffer_destroy(&h->outgoing); |
| gpr_slice_buffer_destroy(&h->incoming); |
| GRPC_AUTH_CONTEXT_UNREF(h->auth_context, "handshake"); |
| GRPC_SECURITY_CONNECTOR_UNREF(h->connector, "handshake"); |
| gpr_free(h); |
| } |
| |
| static void on_peer_checked(grpc_exec_ctx *exec_ctx, void *user_data, |
| grpc_security_status status, |
| grpc_auth_context *auth_context) { |
| grpc_security_handshake *h = user_data; |
| tsi_frame_protector *protector; |
| tsi_result result; |
| if (status != GRPC_SECURITY_OK) { |
| gpr_log(GPR_ERROR, "Error checking peer."); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| h->auth_context = GRPC_AUTH_CONTEXT_REF(auth_context, "handshake"); |
| result = |
| tsi_handshaker_create_frame_protector(h->handshaker, NULL, &protector); |
| if (result != TSI_OK) { |
| gpr_log(GPR_ERROR, "Frame protector creation failed with error %s.", |
| tsi_result_to_string(result)); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| h->secure_endpoint = |
| grpc_secure_endpoint_create(protector, h->wrapped_endpoint, |
| h->left_overs.slices, h->left_overs.count); |
| h->left_overs.count = 0; |
| h->left_overs.length = 0; |
| security_handshake_done(exec_ctx, h, 1); |
| return; |
| } |
| |
| static void check_peer(grpc_exec_ctx *exec_ctx, grpc_security_handshake *h) { |
| tsi_peer peer; |
| tsi_result result = tsi_handshaker_extract_peer(h->handshaker, &peer); |
| |
| if (result != TSI_OK) { |
| gpr_log(GPR_ERROR, "Peer extraction failed with error %s", |
| tsi_result_to_string(result)); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| grpc_security_connector_check_peer(exec_ctx, h->connector, peer, |
| on_peer_checked, h); |
| } |
| |
| static void send_handshake_bytes_to_peer(grpc_exec_ctx *exec_ctx, |
| grpc_security_handshake *h) { |
| size_t offset = 0; |
| tsi_result result = TSI_OK; |
| gpr_slice to_send; |
| |
| do { |
| size_t to_send_size = h->handshake_buffer_size - offset; |
| result = tsi_handshaker_get_bytes_to_send_to_peer( |
| h->handshaker, h->handshake_buffer + offset, &to_send_size); |
| offset += to_send_size; |
| if (result == TSI_INCOMPLETE_DATA) { |
| h->handshake_buffer_size *= 2; |
| h->handshake_buffer = |
| gpr_realloc(h->handshake_buffer, h->handshake_buffer_size); |
| } |
| } while (result == TSI_INCOMPLETE_DATA); |
| |
| if (result != TSI_OK) { |
| gpr_log(GPR_ERROR, "Handshake failed with error %s", |
| tsi_result_to_string(result)); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| |
| to_send = |
| gpr_slice_from_copied_buffer((const char *)h->handshake_buffer, offset); |
| gpr_slice_buffer_reset_and_unref(&h->outgoing); |
| gpr_slice_buffer_add(&h->outgoing, to_send); |
| /* TODO(klempner,jboeuf): This should probably use the client setup |
| deadline */ |
| grpc_endpoint_write(exec_ctx, h->wrapped_endpoint, &h->outgoing, |
| &h->on_handshake_data_sent_to_peer); |
| } |
| |
| static void on_handshake_data_received_from_peer(grpc_exec_ctx *exec_ctx, |
| void *handshake, |
| bool success) { |
| grpc_security_handshake *h = handshake; |
| size_t consumed_slice_size = 0; |
| tsi_result result = TSI_OK; |
| size_t i; |
| size_t num_left_overs; |
| int has_left_overs_in_current_slice = 0; |
| |
| if (!success) { |
| gpr_log(GPR_ERROR, "Read failed."); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| |
| for (i = 0; i < h->incoming.count; i++) { |
| consumed_slice_size = GPR_SLICE_LENGTH(h->incoming.slices[i]); |
| result = tsi_handshaker_process_bytes_from_peer( |
| h->handshaker, GPR_SLICE_START_PTR(h->incoming.slices[i]), |
| &consumed_slice_size); |
| if (!tsi_handshaker_is_in_progress(h->handshaker)) break; |
| } |
| |
| if (tsi_handshaker_is_in_progress(h->handshaker)) { |
| /* We may need more data. */ |
| if (result == TSI_INCOMPLETE_DATA) { |
| grpc_endpoint_read(exec_ctx, h->wrapped_endpoint, &h->incoming, |
| &h->on_handshake_data_received_from_peer); |
| return; |
| } else { |
| send_handshake_bytes_to_peer(exec_ctx, h); |
| return; |
| } |
| } |
| |
| if (result != TSI_OK) { |
| gpr_log(GPR_ERROR, "Handshake failed with error %s", |
| tsi_result_to_string(result)); |
| security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| |
| /* Handshake is done and successful this point. */ |
| has_left_overs_in_current_slice = |
| (consumed_slice_size < GPR_SLICE_LENGTH(h->incoming.slices[i])); |
| num_left_overs = |
| (has_left_overs_in_current_slice ? 1 : 0) + h->incoming.count - i - 1; |
| if (num_left_overs == 0) { |
| check_peer(exec_ctx, h); |
| return; |
| } |
| |
| /* Put the leftovers in our buffer (ownership transfered). */ |
| if (has_left_overs_in_current_slice) { |
| gpr_slice_buffer_add( |
| &h->left_overs, |
| gpr_slice_split_tail(&h->incoming.slices[i], consumed_slice_size)); |
| gpr_slice_unref( |
| h->incoming.slices[i]); /* split_tail above increments refcount. */ |
| } |
| gpr_slice_buffer_addn( |
| &h->left_overs, &h->incoming.slices[i + 1], |
| num_left_overs - (size_t)has_left_overs_in_current_slice); |
| check_peer(exec_ctx, h); |
| } |
| |
| /* If handshake is NULL, the handshake is done. */ |
| static void on_handshake_data_sent_to_peer(grpc_exec_ctx *exec_ctx, |
| void *handshake, bool success) { |
| grpc_security_handshake *h = handshake; |
| |
| /* Make sure that write is OK. */ |
| if (!success) { |
| gpr_log(GPR_ERROR, "Write failed."); |
| if (handshake != NULL) security_handshake_done(exec_ctx, h, 0); |
| return; |
| } |
| |
| /* We may be done. */ |
| if (tsi_handshaker_is_in_progress(h->handshaker)) { |
| /* TODO(klempner,jboeuf): This should probably use the client setup |
| deadline */ |
| grpc_endpoint_read(exec_ctx, h->wrapped_endpoint, &h->incoming, |
| &h->on_handshake_data_received_from_peer); |
| } else { |
| check_peer(exec_ctx, h); |
| } |
| } |
| |
| void grpc_do_security_handshake(grpc_exec_ctx *exec_ctx, |
| tsi_handshaker *handshaker, |
| grpc_security_connector *connector, |
| grpc_endpoint *nonsecure_endpoint, |
| grpc_security_handshake_done_cb cb, |
| void *user_data) { |
| grpc_security_connector_handshake_list *handshake_node; |
| grpc_security_handshake *h = gpr_malloc(sizeof(grpc_security_handshake)); |
| memset(h, 0, sizeof(grpc_security_handshake)); |
| h->handshaker = handshaker; |
| h->connector = GRPC_SECURITY_CONNECTOR_REF(connector, "handshake"); |
| h->handshake_buffer_size = GRPC_INITIAL_HANDSHAKE_BUFFER_SIZE; |
| h->handshake_buffer = gpr_malloc(h->handshake_buffer_size); |
| h->wrapped_endpoint = nonsecure_endpoint; |
| h->user_data = user_data; |
| h->cb = cb; |
| grpc_closure_init(&h->on_handshake_data_sent_to_peer, |
| on_handshake_data_sent_to_peer, h); |
| grpc_closure_init(&h->on_handshake_data_received_from_peer, |
| on_handshake_data_received_from_peer, h); |
| gpr_slice_buffer_init(&h->left_overs); |
| gpr_slice_buffer_init(&h->outgoing); |
| gpr_slice_buffer_init(&h->incoming); |
| if (!connector->is_client_side) { |
| handshake_node = gpr_malloc(sizeof(grpc_security_connector_handshake_list)); |
| handshake_node->handshake = h; |
| gpr_mu_lock(&connector->mu); |
| handshake_node->next = connector->handshaking_handshakes; |
| connector->handshaking_handshakes = handshake_node; |
| gpr_mu_unlock(&connector->mu); |
| } |
| send_handshake_bytes_to_peer(exec_ctx, h); |
| } |
| |
| void grpc_security_handshake_shutdown(grpc_exec_ctx *exec_ctx, |
| void *handshake) { |
| grpc_security_handshake *h = handshake; |
| grpc_endpoint_shutdown(exec_ctx, h->wrapped_endpoint); |
| } |
