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|
/*
*
* Copyright 2015, 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/tsi/fake_transport_security.h"
#include <stdlib.h>
#include <string.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/useful.h>
#include "src/core/tsi/transport_security.h"
/* --- Constants. ---*/
#define TSI_FAKE_FRAME_HEADER_SIZE 4
#define TSI_FAKE_FRAME_INITIAL_ALLOCATED_SIZE 64
#define TSI_FAKE_DEFAULT_FRAME_SIZE 16384
/* --- Structure definitions. ---*/
/* a frame is encoded like this:
| size | data |
where the size field value is the size of the size field plus the size of
the data encoded in little endian on 4 bytes. */
typedef struct {
unsigned char* data;
size_t size;
size_t allocated_size;
size_t offset;
int needs_draining;
} tsi_fake_frame;
typedef enum {
TSI_FAKE_CLIENT_INIT = 0,
TSI_FAKE_SERVER_INIT = 1,
TSI_FAKE_CLIENT_FINISHED = 2,
TSI_FAKE_SERVER_FINISHED = 3,
TSI_FAKE_HANDSHAKE_MESSAGE_MAX = 4
} tsi_fake_handshake_message;
typedef struct {
tsi_handshaker base;
int is_client;
tsi_fake_handshake_message next_message_to_send;
int needs_incoming_message;
tsi_fake_frame incoming;
tsi_fake_frame outgoing;
tsi_result result;
} tsi_fake_handshaker;
typedef struct {
tsi_frame_protector base;
tsi_fake_frame protect_frame;
tsi_fake_frame unprotect_frame;
size_t max_frame_size;
} tsi_fake_frame_protector;
/* --- Utils. ---*/
static const char* tsi_fake_handshake_message_strings[] = {
"CLIENT_INIT", "SERVER_INIT", "CLIENT_FINISHED", "SERVER_FINISHED"};
static const char* tsi_fake_handshake_message_to_string(int msg) {
if (msg < 0 || msg >= TSI_FAKE_HANDSHAKE_MESSAGE_MAX) {
gpr_log(GPR_ERROR, "Invalid message %d", msg);
return "UNKNOWN";
}
return tsi_fake_handshake_message_strings[msg];
}
static tsi_result tsi_fake_handshake_message_from_string(
const char* msg_string, tsi_fake_handshake_message* msg) {
tsi_fake_handshake_message i;
for (i = 0; i < TSI_FAKE_HANDSHAKE_MESSAGE_MAX; i++) {
if (strncmp(msg_string, tsi_fake_handshake_message_strings[i],
strlen(tsi_fake_handshake_message_strings[i])) == 0) {
*msg = i;
return TSI_OK;
}
}
gpr_log(GPR_ERROR, "Invalid handshake message.");
return TSI_DATA_CORRUPTED;
}
static gpr_uint32 load32_little_endian(const unsigned char* buf) {
return ((gpr_uint32)(buf[0]) | (gpr_uint32)(buf[1] << 8) |
(gpr_uint32)(buf[2] << 16) | (gpr_uint32)(buf[3] << 24));
}
static void store32_little_endian(gpr_uint32 value, unsigned char* buf) {
buf[3] = (unsigned char)(value >> 24) & 0xFF;
buf[2] = (unsigned char)(value >> 16) & 0xFF;
buf[1] = (unsigned char)(value >> 8) & 0xFF;
buf[0] = (unsigned char)(value)&0xFF;
}
static void tsi_fake_frame_reset(tsi_fake_frame* frame, int needs_draining) {
frame->offset = 0;
frame->needs_draining = needs_draining;
if (!needs_draining) frame->size = 0;
}
/* Returns 1 if successful, 0 otherwise. */
static int tsi_fake_frame_ensure_size(tsi_fake_frame* frame) {
if (frame->data == NULL) {
frame->allocated_size = frame->size;
frame->data = malloc(frame->allocated_size);
if (frame->data == NULL) return 0;
} else if (frame->size > frame->allocated_size) {
unsigned char* new_data = realloc(frame->data, frame->size);
if (new_data == NULL) {
free(frame->data);
frame->data = NULL;
return 0;
}
frame->data = new_data;
frame->allocated_size = frame->size;
}
return 1;
}
/* This method should not be called if frame->needs_framing is not 0. */
static tsi_result fill_frame_from_bytes(const unsigned char* incoming_bytes,
size_t* incoming_bytes_size,
tsi_fake_frame* frame) {
size_t available_size = *incoming_bytes_size;
size_t to_read_size = 0;
const unsigned char* bytes_cursor = incoming_bytes;
if (frame->needs_draining) return TSI_INTERNAL_ERROR;
if (frame->data == NULL) {
frame->allocated_size = TSI_FAKE_FRAME_INITIAL_ALLOCATED_SIZE;
frame->data = malloc(frame->allocated_size);
if (frame->data == NULL) return TSI_OUT_OF_RESOURCES;
}
if (frame->offset < TSI_FAKE_FRAME_HEADER_SIZE) {
to_read_size = TSI_FAKE_FRAME_HEADER_SIZE - frame->offset;
if (to_read_size > available_size) {
/* Just fill what we can and exit. */
memcpy(frame->data + frame->offset, bytes_cursor, available_size);
bytes_cursor += available_size;
frame->offset += available_size;
*incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
return TSI_INCOMPLETE_DATA;
}
memcpy(frame->data + frame->offset, bytes_cursor, to_read_size);
bytes_cursor += to_read_size;
frame->offset += to_read_size;
available_size -= to_read_size;
frame->size = load32_little_endian(frame->data);
if (!tsi_fake_frame_ensure_size(frame)) return TSI_OUT_OF_RESOURCES;
}
to_read_size = frame->size - frame->offset;
if (to_read_size > available_size) {
memcpy(frame->data + frame->offset, bytes_cursor, available_size);
frame->offset += available_size;
bytes_cursor += available_size;
*incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
return TSI_INCOMPLETE_DATA;
}
memcpy(frame->data + frame->offset, bytes_cursor, to_read_size);
bytes_cursor += to_read_size;
*incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
tsi_fake_frame_reset(frame, 1 /* needs_draining */);
return TSI_OK;
}
/* This method should not be called if frame->needs_framing is 0. */
static tsi_result drain_frame_to_bytes(unsigned char* outgoing_bytes,
size_t* outgoing_bytes_size,
tsi_fake_frame* frame) {
size_t to_write_size = frame->size - frame->offset;
if (!frame->needs_draining) return TSI_INTERNAL_ERROR;
if (*outgoing_bytes_size < to_write_size) {
memcpy(outgoing_bytes, frame->data + frame->offset, *outgoing_bytes_size);
frame->offset += *outgoing_bytes_size;
return TSI_INCOMPLETE_DATA;
}
memcpy(outgoing_bytes, frame->data + frame->offset, to_write_size);
*outgoing_bytes_size = to_write_size;
tsi_fake_frame_reset(frame, 0 /* needs_draining */);
return TSI_OK;
}
static tsi_result bytes_to_frame(unsigned char* bytes, size_t bytes_size,
tsi_fake_frame* frame) {
frame->offset = 0;
frame->size = bytes_size + TSI_FAKE_FRAME_HEADER_SIZE;
if (!tsi_fake_frame_ensure_size(frame)) return TSI_OUT_OF_RESOURCES;
store32_little_endian((gpr_uint32)frame->size, frame->data);
memcpy(frame->data + TSI_FAKE_FRAME_HEADER_SIZE, bytes, bytes_size);
tsi_fake_frame_reset(frame, 1 /* needs draining */);
return TSI_OK;
}
static void tsi_fake_frame_destruct(tsi_fake_frame* frame) {
if (frame->data != NULL) free(frame->data);
}
/* --- tsi_frame_protector methods implementation. ---*/
static tsi_result fake_protector_protect(tsi_frame_protector* self,
const unsigned char* unprotected_bytes,
size_t* unprotected_bytes_size,
unsigned char* protected_output_frames,
size_t* protected_output_frames_size) {
tsi_result result = TSI_OK;
tsi_fake_frame_protector* impl = (tsi_fake_frame_protector*)self;
unsigned char frame_header[TSI_FAKE_FRAME_HEADER_SIZE];
tsi_fake_frame* frame = &impl->protect_frame;
size_t saved_output_size = *protected_output_frames_size;
size_t drained_size = 0;
size_t* num_bytes_written = protected_output_frames_size;
*num_bytes_written = 0;
/* Try to drain first. */
if (frame->needs_draining) {
drained_size = saved_output_size - *num_bytes_written;
result =
drain_frame_to_bytes(protected_output_frames, &drained_size, frame);
*num_bytes_written += drained_size;
protected_output_frames += drained_size;
if (result != TSI_OK) {
if (result == TSI_INCOMPLETE_DATA) {
*unprotected_bytes_size = 0;
result = TSI_OK;
}
return result;
}
}
/* Now process the unprotected_bytes. */
if (frame->needs_draining) return TSI_INTERNAL_ERROR;
if (frame->size == 0) {
/* New frame, create a header. */
size_t written_in_frame_size = 0;
store32_little_endian((gpr_uint32)impl->max_frame_size, frame_header);
written_in_frame_size = TSI_FAKE_FRAME_HEADER_SIZE;
result = fill_frame_from_bytes(frame_header, &written_in_frame_size, frame);
if (result != TSI_INCOMPLETE_DATA) {
gpr_log(GPR_ERROR, "fill_frame_from_bytes returned %s",
tsi_result_to_string(result));
return result;
}
}
result =
fill_frame_from_bytes(unprotected_bytes, unprotected_bytes_size, frame);
if (result != TSI_OK) {
if (result == TSI_INCOMPLETE_DATA) result = TSI_OK;
return result;
}
/* Try to drain again. */
if (!frame->needs_draining) return TSI_INTERNAL_ERROR;
if (frame->offset != 0) return TSI_INTERNAL_ERROR;
drained_size = saved_output_size - *num_bytes_written;
result = drain_frame_to_bytes(protected_output_frames, &drained_size, frame);
*num_bytes_written += drained_size;
if (result == TSI_INCOMPLETE_DATA) result = TSI_OK;
return result;
}
static tsi_result fake_protector_protect_flush(
tsi_frame_protector* self, unsigned char* protected_output_frames,
size_t* protected_output_frames_size, size_t* still_pending_size) {
tsi_result result = TSI_OK;
tsi_fake_frame_protector* impl = (tsi_fake_frame_protector*)self;
tsi_fake_frame* frame = &impl->protect_frame;
if (!frame->needs_draining) {
/* Create a short frame. */
frame->size = frame->offset;
frame->offset = 0;
frame->needs_draining = 1;
store32_little_endian((gpr_uint32)frame->size,
frame->data); /* Overwrite header. */
}
result = drain_frame_to_bytes(protected_output_frames,
protected_output_frames_size, frame);
if (result == TSI_INCOMPLETE_DATA) result = TSI_OK;
*still_pending_size = frame->size - frame->offset;
return result;
}
static tsi_result fake_protector_unprotect(
tsi_frame_protector* self, const unsigned char* protected_frames_bytes,
size_t* protected_frames_bytes_size, unsigned char* unprotected_bytes,
size_t* unprotected_bytes_size) {
tsi_result result = TSI_OK;
tsi_fake_frame_protector* impl = (tsi_fake_frame_protector*)self;
tsi_fake_frame* frame = &impl->unprotect_frame;
size_t saved_output_size = *unprotected_bytes_size;
size_t drained_size = 0;
size_t* num_bytes_written = unprotected_bytes_size;
*num_bytes_written = 0;
/* Try to drain first. */
if (frame->needs_draining) {
/* Go past the header if needed. */
if (frame->offset == 0) frame->offset = TSI_FAKE_FRAME_HEADER_SIZE;
drained_size = saved_output_size - *num_bytes_written;
result = drain_frame_to_bytes(unprotected_bytes, &drained_size, frame);
unprotected_bytes += drained_size;
*num_bytes_written += drained_size;
if (result != TSI_OK) {
if (result == TSI_INCOMPLETE_DATA) {
*protected_frames_bytes_size = 0;
result = TSI_OK;
}
return result;
}
}
/* Now process the protected_bytes. */
if (frame->needs_draining) return TSI_INTERNAL_ERROR;
result = fill_frame_from_bytes(protected_frames_bytes,
protected_frames_bytes_size, frame);
if (result != TSI_OK) {
if (result == TSI_INCOMPLETE_DATA) result = TSI_OK;
return result;
}
/* Try to drain again. */
if (!frame->needs_draining) return TSI_INTERNAL_ERROR;
if (frame->offset != 0) return TSI_INTERNAL_ERROR;
frame->offset = TSI_FAKE_FRAME_HEADER_SIZE; /* Go past the header. */
drained_size = saved_output_size - *num_bytes_written;
result = drain_frame_to_bytes(unprotected_bytes, &drained_size, frame);
*num_bytes_written += drained_size;
if (result == TSI_INCOMPLETE_DATA) result = TSI_OK;
return result;
}
static void fake_protector_destroy(tsi_frame_protector* self) {
tsi_fake_frame_protector* impl = (tsi_fake_frame_protector*)self;
tsi_fake_frame_destruct(&impl->protect_frame);
tsi_fake_frame_destruct(&impl->unprotect_frame);
free(self);
}
static const tsi_frame_protector_vtable frame_protector_vtable = {
fake_protector_protect, fake_protector_protect_flush,
fake_protector_unprotect, fake_protector_destroy,
};
/* --- tsi_handshaker methods implementation. ---*/
static tsi_result fake_handshaker_get_bytes_to_send_to_peer(
tsi_handshaker* self, unsigned char* bytes, size_t* bytes_size) {
tsi_fake_handshaker* impl = (tsi_fake_handshaker*)self;
tsi_result result = TSI_OK;
if (impl->needs_incoming_message || impl->result == TSI_OK) {
*bytes_size = 0;
return TSI_OK;
}
if (!impl->outgoing.needs_draining) {
tsi_fake_handshake_message next_message_to_send =
impl->next_message_to_send + 2;
const char* msg_string =
tsi_fake_handshake_message_to_string(impl->next_message_to_send);
result = bytes_to_frame((unsigned char*)msg_string, strlen(msg_string),
&impl->outgoing);
if (result != TSI_OK) return result;
if (next_message_to_send > TSI_FAKE_HANDSHAKE_MESSAGE_MAX) {
next_message_to_send = TSI_FAKE_HANDSHAKE_MESSAGE_MAX;
}
if (tsi_tracing_enabled) {
gpr_log(GPR_INFO, "%s prepared %s.",
impl->is_client ? "Client" : "Server",
tsi_fake_handshake_message_to_string(impl->next_message_to_send));
}
impl->next_message_to_send = next_message_to_send;
}
result = drain_frame_to_bytes(bytes, bytes_size, &impl->outgoing);
if (result != TSI_OK) return result;
if (!impl->is_client &&
impl->next_message_to_send == TSI_FAKE_HANDSHAKE_MESSAGE_MAX) {
/* We're done. */
if (tsi_tracing_enabled) {
gpr_log(GPR_INFO, "Server is done.");
}
impl->result = TSI_OK;
} else {
impl->needs_incoming_message = 1;
}
return TSI_OK;
}
static tsi_result fake_handshaker_process_bytes_from_peer(
tsi_handshaker* self, const unsigned char* bytes, size_t* bytes_size) {
tsi_result result = TSI_OK;
tsi_fake_handshaker* impl = (tsi_fake_handshaker*)self;
tsi_fake_handshake_message expected_msg = impl->next_message_to_send - 1;
tsi_fake_handshake_message received_msg;
if (!impl->needs_incoming_message || impl->result == TSI_OK) {
*bytes_size = 0;
return TSI_OK;
}
result = fill_frame_from_bytes(bytes, bytes_size, &impl->incoming);
if (result != TSI_OK) return result;
/* We now have a complete frame. */
result = tsi_fake_handshake_message_from_string(
(const char*)impl->incoming.data + TSI_FAKE_FRAME_HEADER_SIZE,
&received_msg);
if (result != TSI_OK) {
impl->result = result;
return result;
}
if (received_msg != expected_msg) {
gpr_log(GPR_ERROR, "Invalid received message (%s instead of %s)",
tsi_fake_handshake_message_to_string(received_msg),
tsi_fake_handshake_message_to_string(expected_msg));
}
if (tsi_tracing_enabled) {
gpr_log(GPR_INFO, "%s received %s.", impl->is_client ? "Client" : "Server",
tsi_fake_handshake_message_to_string(received_msg));
}
tsi_fake_frame_reset(&impl->incoming, 0 /* needs_draining */);
impl->needs_incoming_message = 0;
if (impl->next_message_to_send == TSI_FAKE_HANDSHAKE_MESSAGE_MAX) {
/* We're done. */
if (tsi_tracing_enabled) {
gpr_log(GPR_INFO, "%s is done.", impl->is_client ? "Client" : "Server");
}
impl->result = TSI_OK;
}
return TSI_OK;
}
static tsi_result fake_handshaker_get_result(tsi_handshaker* self) {
tsi_fake_handshaker* impl = (tsi_fake_handshaker*)self;
return impl->result;
}
static tsi_result fake_handshaker_extract_peer(tsi_handshaker* self,
tsi_peer* peer) {
tsi_result result = tsi_construct_peer(1, peer);
if (result != TSI_OK) return result;
result = tsi_construct_string_peer_property_from_cstring(
TSI_CERTIFICATE_TYPE_PEER_PROPERTY, TSI_FAKE_CERTIFICATE_TYPE,
&peer->properties[0]);
if (result != TSI_OK) tsi_peer_destruct(peer);
return result;
}
static tsi_result fake_handshaker_create_frame_protector(
tsi_handshaker* self, size_t* max_protected_frame_size,
tsi_frame_protector** protector) {
*protector = tsi_create_fake_protector(max_protected_frame_size);
if (*protector == NULL) return TSI_OUT_OF_RESOURCES;
return TSI_OK;
}
static void fake_handshaker_destroy(tsi_handshaker* self) {
tsi_fake_handshaker* impl = (tsi_fake_handshaker*)self;
tsi_fake_frame_destruct(&impl->incoming);
tsi_fake_frame_destruct(&impl->outgoing);
free(self);
}
static const tsi_handshaker_vtable handshaker_vtable = {
fake_handshaker_get_bytes_to_send_to_peer,
fake_handshaker_process_bytes_from_peer,
fake_handshaker_get_result,
fake_handshaker_extract_peer,
fake_handshaker_create_frame_protector,
fake_handshaker_destroy,
};
tsi_handshaker* tsi_create_fake_handshaker(int is_client) {
tsi_fake_handshaker* impl = calloc(1, sizeof(tsi_fake_handshaker));
impl->base.vtable = &handshaker_vtable;
impl->is_client = is_client;
impl->result = TSI_HANDSHAKE_IN_PROGRESS;
if (is_client) {
impl->needs_incoming_message = 0;
impl->next_message_to_send = TSI_FAKE_CLIENT_INIT;
} else {
impl->needs_incoming_message = 1;
impl->next_message_to_send = TSI_FAKE_SERVER_INIT;
}
return &impl->base;
}
tsi_frame_protector* tsi_create_fake_protector(
size_t* max_protected_frame_size) {
tsi_fake_frame_protector* impl = calloc(1, sizeof(tsi_fake_frame_protector));
if (impl == NULL) return NULL;
impl->max_frame_size = (max_protected_frame_size == NULL)
? TSI_FAKE_DEFAULT_FRAME_SIZE
: *max_protected_frame_size;
impl->base.vtable = &frame_protector_vtable;
return &impl->base;
}
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