3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #ifndef GRPC_CORE_TSI_TRANSPORT_SECURITY_INTERFACE_H
20 #define GRPC_CORE_TSI_TRANSPORT_SECURITY_INTERFACE_H
22 #include <grpc/support/port_platform.h>
27 #include "src/core/lib/debug/trace.h"
29 /* --- tsi result --- */
33 TSI_UNKNOWN_ERROR = 1,
34 TSI_INVALID_ARGUMENT = 2,
35 TSI_PERMISSION_DENIED = 3,
36 TSI_INCOMPLETE_DATA = 4,
37 TSI_FAILED_PRECONDITION = 5,
38 TSI_UNIMPLEMENTED = 6,
39 TSI_INTERNAL_ERROR = 7,
40 TSI_DATA_CORRUPTED = 8,
42 TSI_PROTOCOL_FAILURE = 10,
43 TSI_HANDSHAKE_IN_PROGRESS = 11,
44 TSI_OUT_OF_RESOURCES = 12,
46 TSI_HANDSHAKE_SHUTDOWN = 14,
51 TSI_DONT_REQUEST_CLIENT_CERTIFICATE,
52 TSI_REQUEST_CLIENT_CERTIFICATE_BUT_DONT_VERIFY,
53 TSI_REQUEST_CLIENT_CERTIFICATE_AND_VERIFY,
54 TSI_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_BUT_DONT_VERIFY,
55 TSI_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_AND_VERIFY,
56 } tsi_client_certificate_request_type;
58 const char* tsi_result_to_string(tsi_result result);
60 /* --- tsi tracing --- */
62 extern grpc_core::TraceFlag tsi_tracing_enabled;
64 /* -- tsi_zero_copy_grpc_protector object --
66 This object protects and unprotects grpc slice buffers with zero or minimized
67 memory copy once the handshake is done. Implementations of this object must be
68 thread compatible. This object depends on grpc and the details of this object
69 is defined in transport_security_grpc.h. */
71 typedef struct tsi_zero_copy_grpc_protector tsi_zero_copy_grpc_protector;
73 /* --- tsi_frame_protector object ---
75 This object protects and unprotects buffers once the handshake is done.
76 Implementations of this object must be thread compatible. */
78 typedef struct tsi_frame_protector tsi_frame_protector;
80 /* Outputs protected frames.
81 - unprotected_bytes is an input only parameter and points to the data
83 - unprotected_bytes_size is an input/output parameter used by the caller to
84 specify how many bytes are available in unprotected_bytes. The output
85 value is the number of bytes consumed during the call.
86 - protected_output_frames points to a buffer allocated by the caller that
88 - protected_output_frames_size is an input/output parameter used by the
89 caller to specify how many bytes are available in protected_output_frames.
90 As an output, this value indicates the number of bytes written.
91 - This method returns TSI_OK in case of success or a specific error code in
92 case of failure. Note that even if all the input unprotected bytes are
93 consumed, they may not have been processed into the returned protected
94 output frames. The caller should call the protect_flush method
95 to make sure that there are no more protected bytes buffered in the
98 A typical way to call this method would be:
100 ------------------------------------------------------------------------
101 unsigned char protected_buffer[4096];
102 size_t protected_buffer_size = sizeof(protected_buffer);
103 tsi_result result = TSI_OK;
104 while (message_size > 0) {
105 size_t protected_buffer_size_to_send = protected_buffer_size;
106 size_t processed_message_size = message_size;
107 result = tsi_frame_protector_protect(protector,
109 &processed_message_size,
111 &protected_buffer_size_to_send);
112 if (result != TSI_OK) break;
113 send_bytes_to_peer(protected_buffer, protected_buffer_size_to_send);
114 message_bytes += processed_message_size;
115 message_size -= processed_message_size;
117 // Don't forget to flush.
118 if (message_size == 0) {
119 size_t still_pending_size;
121 protected_buffer_size_to_send = protected_buffer_size;
122 result = tsi_frame_protector_protect_flush(
123 protector, protected_buffer,
124 &protected_buffer_size_to_send, &still_pending_size);
125 if (result != TSI_OK) break;
126 send_bytes_to_peer(protected_buffer, protected_buffer_size_to_send);
127 } while (still_pending_size > 0);
131 if (result != TSI_OK) HandleError(result);
132 ------------------------------------------------------------------------ */
133 tsi_result tsi_frame_protector_protect(tsi_frame_protector* self,
134 const unsigned char* unprotected_bytes,
135 size_t* unprotected_bytes_size,
136 unsigned char* protected_output_frames,
137 size_t* protected_output_frames_size);
139 /* Indicates that we need to flush the bytes buffered in the protector and get
141 - protected_output_frames points to a buffer allocated by the caller that
143 - protected_output_frames_size is an input/output parameter used by the
144 caller to specify how many bytes are available in protected_output_frames.
145 - still_pending_bytes is an output parameter indicating the number of bytes
146 that still need to be flushed from the protector.*/
147 tsi_result tsi_frame_protector_protect_flush(
148 tsi_frame_protector* self, unsigned char* protected_output_frames,
149 size_t* protected_output_frames_size, size_t* still_pending_size);
151 /* Outputs unprotected bytes.
152 - protected_frames_bytes is an input only parameter and points to the
153 protected frames to be unprotected.
154 - protected_frames_bytes_size is an input/output only parameter used by the
155 caller to specify how many bytes are available in protected_bytes. The
156 output value is the number of bytes consumed during the call.
157 Implementations will buffer up to a frame of protected data.
158 - unprotected_bytes points to a buffer allocated by the caller that will be
160 - unprotected_bytes_size is an input/output parameter used by the caller to
161 specify how many bytes are available in unprotected_bytes. This
162 value is expected to be at most max_protected_frame_size minus overhead
163 which means that max_protected_frame_size is a safe bet. The output value
164 is the number of bytes actually written.
165 If *unprotected_bytes_size is unchanged, there may be more data remaining
166 to unprotect, and the caller should call this function again.
168 - This method returns TSI_OK in case of success. Success includes cases where
169 there is not enough data to output a frame in which case
170 unprotected_bytes_size will be set to 0 and cases where the internal buffer
171 needs to be read before new protected data can be processed in which case
172 protected_frames_size will be set to 0. */
173 tsi_result tsi_frame_protector_unprotect(
174 tsi_frame_protector* self, const unsigned char* protected_frames_bytes,
175 size_t* protected_frames_bytes_size, unsigned char* unprotected_bytes,
176 size_t* unprotected_bytes_size);
178 /* Destroys the tsi_frame_protector object. */
179 void tsi_frame_protector_destroy(tsi_frame_protector* self);
181 /* --- tsi_peer objects ---
183 tsi_peer objects are a set of properties. The peer owns the properties. */
185 /* This property is of type TSI_PEER_PROPERTY_STRING. */
186 #define TSI_CERTIFICATE_TYPE_PEER_PROPERTY "certificate_type"
188 /* Property values may contain NULL characters just like C++ strings.
189 The length field gives the length of the string. */
190 typedef struct tsi_peer_property {
199 tsi_peer_property* properties;
200 size_t property_count;
203 /* Destructs the tsi_peer object. */
204 void tsi_peer_destruct(tsi_peer* self);
206 /* --- tsi_handshaker_result object ---
208 This object contains all necessary handshake results and data such as peer
209 info, negotiated keys, unused handshake bytes, when the handshake completes.
210 Implementations of this object must be thread compatible. */
212 typedef struct tsi_handshaker_result tsi_handshaker_result;
214 /* This method extracts tsi peer. It returns TSI_OK assuming there is no fatal
216 The caller is responsible for destructing the peer. */
217 tsi_result tsi_handshaker_result_extract_peer(const tsi_handshaker_result* self,
220 /* This method creates a tsi_frame_protector object. It returns TSI_OK assuming
221 there is no fatal error.
222 The caller is responsible for destroying the protector. */
223 tsi_result tsi_handshaker_result_create_frame_protector(
224 const tsi_handshaker_result* self, size_t* max_output_protected_frame_size,
225 tsi_frame_protector** protector);
227 /* This method returns the unused bytes from the handshake. It returns TSI_OK
228 assuming there is no fatal error.
229 Ownership of the bytes is retained by the handshaker result. As a
230 consequence, the caller must not free the bytes. */
231 tsi_result tsi_handshaker_result_get_unused_bytes(
232 const tsi_handshaker_result* self, const unsigned char** bytes,
235 /* This method releases the tsi_handshaker_handshaker object. After this method
236 is called, no other method can be called on the object. */
237 void tsi_handshaker_result_destroy(tsi_handshaker_result* self);
239 /* --- tsi_handshaker objects ----
241 Implementations of this object must be thread compatible.
243 ------------------------------------------------------------------------
245 A typical usage supporting both synchronous and asynchronous TSI handshaker
246 implementations would be:
248 ------------------------------------------------------------------------
251 tsi_handshaker *handshaker;
252 tsi_handshaker_result *handshaker_result;
253 unsigned char *handshake_buffer;
254 size_t handshake_buffer_size;
256 } security_handshaker;
258 void do_handshake(security_handshaker *h, ...) {
259 // Start the handshake by the calling do_handshake_next.
260 do_handshake_next(h, NULL, 0);
264 // This method is the callback function when data is received from the
265 // peer. This method will read bytes into the handshake buffer and call
266 // do_handshake_next.
267 void on_handshake_data_received_from_peer(void *user_data) {
268 security_handshaker *h = (security_handshaker *)user_data;
269 size_t bytes_received_size = h->handshake_buffer_size;
270 read_bytes_from_peer(h->handshake_buffer, &bytes_received_size);
271 do_handshake_next(h, h->handshake_buffer, bytes_received_size);
274 // This method processes a step of handshake, calling tsi_handshaker_next.
275 void do_handshake_next(security_handshaker *h,
276 const unsigned char* bytes_received,
277 size_t bytes_received_size) {
278 tsi_result status = TSI_OK;
279 unsigned char *bytes_to_send = NULL;
280 size_t bytes_to_send_size = 0;
281 tsi_handshaker_result *result = NULL;
282 status = tsi_handshaker_next(
283 handshaker, bytes_received, bytes_received_size, &bytes_to_send,
284 &bytes_to_send_size, &result, on_handshake_next_done, h);
285 // If TSI handshaker is asynchronous, on_handshake_next_done will be
286 // executed inside tsi_handshaker_next.
287 if (status == TSI_ASYNC) return;
288 // If TSI handshaker is synchronous, invoke callback directly in this
290 on_handshake_next_done(status, (void *)h, bytes_to_send,
291 bytes_to_send_size, result);
294 // This is the callback function to execute after tsi_handshaker_next.
295 // It is passed to tsi_handshaker_next as a function parameter.
296 void on_handshake_next_done(
297 tsi_result status, void *user_data, const unsigned char *bytes_to_send,
298 size_t bytes_to_send_size, tsi_handshaker_result *result) {
299 security_handshaker *h = (security_handshaker *)user_data;
300 if (status == TSI_INCOMPLETE_DATA) {
301 // Schedule an asynchronous read from the peer. If handshake data are
302 // received, on_handshake_data_received_from_peer will be called.
303 async_read_from_peer(..., ..., on_handshake_data_received_from_peer);
306 if (status != TSI_OK) return;
308 if (bytes_to_send_size > 0) {
309 send_bytes_to_peer(bytes_to_send, bytes_to_send_size);
312 if (result != NULL) {
313 // Handshake completed.
317 status = tsi_handshaker_result_extract_peer(result, &peer);
318 if (status != TSI_OK) return;
319 status = check_peer(&peer);
320 tsi_peer_destruct(&peer);
321 if (status != TSI_OK) return;
323 // Create the protector.
324 tsi_frame_protector* protector = NULL;
325 status = tsi_handshaker_result_create_frame_protector(result, NULL,
327 if (status != TSI_OK) return;
329 // Do not forget to unprotect outstanding data if any.
333 ------------------------------------------------------------------------ */
334 typedef struct tsi_handshaker tsi_handshaker;
336 /* TODO(jiangtaoli2016): Cleans up deprecated methods when we are ready. */
338 /* TO BE DEPRECATED SOON. Use tsi_handshaker_next instead.
339 Gets bytes that need to be sent to the peer.
340 - bytes is the buffer that will be written with the data to be sent to the
342 - bytes_size is an input/output parameter specifying the capacity of the
343 bytes parameter as input and the number of bytes written as output.
344 Returns TSI_OK if all the data to send to the peer has been written or if
345 nothing has to be sent to the peer (in which base bytes_size outputs to 0),
346 otherwise returns TSI_INCOMPLETE_DATA which indicates that this method
347 needs to be called again to get all the bytes to send to the peer (there
348 was more data to write than the specified bytes_size). In case of a fatal
349 error in the handshake, another specific error code is returned. */
350 tsi_result tsi_handshaker_get_bytes_to_send_to_peer(tsi_handshaker* self,
351 unsigned char* bytes,
354 /* TO BE DEPRECATED SOON. Use tsi_handshaker_next instead.
355 Processes bytes received from the peer.
356 - bytes is the buffer containing the data.
357 - bytes_size is an input/output parameter specifying the size of the data as
358 input and the number of bytes consumed as output.
359 Return TSI_OK if the handshake has all the data it needs to process,
360 otherwise return TSI_INCOMPLETE_DATA which indicates that this method
361 needs to be called again to complete the data needed for processing. In
362 case of a fatal error in the handshake, another specific error code is
364 tsi_result tsi_handshaker_process_bytes_from_peer(tsi_handshaker* self,
365 const unsigned char* bytes,
368 /* TO BE DEPRECATED SOON.
369 Gets the result of the handshaker.
370 Returns TSI_OK if the hanshake completed successfully and there has been no
371 errors. Returns TSI_HANDSHAKE_IN_PROGRESS if the handshaker is not done yet
372 but no error has been encountered so far. Otherwise the handshaker failed
373 with the returned error. */
374 tsi_result tsi_handshaker_get_result(tsi_handshaker* self);
376 /* TO BE DEPRECATED SOON.
377 Returns 1 if the handshake is in progress, 0 otherwise. */
378 #define tsi_handshaker_is_in_progress(h) \
379 (tsi_handshaker_get_result((h)) == TSI_HANDSHAKE_IN_PROGRESS)
381 /* TO BE DEPRECATED SOON. Use tsi_handshaker_result_extract_peer instead.
382 This method may return TSI_FAILED_PRECONDITION if
383 tsi_handshaker_is_in_progress returns 1, it returns TSI_OK otherwise
384 assuming the handshaker is not in a fatal error state.
385 The caller is responsible for destructing the peer. */
386 tsi_result tsi_handshaker_extract_peer(tsi_handshaker* self, tsi_peer* peer);
388 /* TO BE DEPRECATED SOON. Use tsi_handshaker_result_create_frame_protector
390 This method creates a tsi_frame_protector object after the handshake phase
391 is done. After this method has been called successfully, the only method
392 that can be called on this object is Destroy.
393 - max_output_protected_frame_size is an input/output parameter specifying the
394 desired max output protected frame size as input and outputing the actual
395 max output frame size as the output. Passing NULL is OK and will result in
396 the implementation choosing the default maximum protected frame size. Note
397 that this size only applies to outgoing frames (generated with
398 tsi_frame_protector_protect) and not incoming frames (input of
399 tsi_frame_protector_unprotect).
400 - protector is an output parameter pointing to the newly created
401 tsi_frame_protector object.
402 This method may return TSI_FAILED_PRECONDITION if
403 tsi_handshaker_is_in_progress returns 1, it returns TSI_OK otherwise assuming
404 the handshaker is not in a fatal error state.
405 The caller is responsible for destroying the protector. */
406 tsi_result tsi_handshaker_create_frame_protector(
407 tsi_handshaker* self, size_t* max_output_protected_frame_size,
408 tsi_frame_protector** protector);
410 /* Callback function definition for tsi_handshaker_next.
411 - status indicates the status of the next operation.
412 - user_data is the argument to callback function passed from the caller.
413 - bytes_to_send is the data buffer to be sent to the peer.
414 - bytes_to_send_size is the size of data buffer to be sent to the peer.
415 - handshaker_result is the result of handshake when the handshake completes,
416 is NULL otherwise. */
417 typedef void (*tsi_handshaker_on_next_done_cb)(
418 tsi_result status, void* user_data, const unsigned char* bytes_to_send,
419 size_t bytes_to_send_size, tsi_handshaker_result* handshaker_result);
421 /* Conduct a next step of the handshake.
422 - received_bytes is the buffer containing the data received from the peer.
423 - received_bytes_size is the size of the data received from the peer.
424 - bytes_to_send is the data buffer to be sent to the peer.
425 - bytes_to_send_size is the size of data buffer to be sent to the peer.
426 - handshaker_result is the result of handshake if the handshake completes.
427 - cb is the callback function defined above. It can be NULL for synchronous
428 TSI handshaker implementation.
429 - user_data is the argument to callback function passed from the caller.
430 This method returns TSI_ASYNC if the TSI handshaker implementation is
431 asynchronous, and in this case, the callback is guaranteed to run in another
432 thread owned by TSI. It returns TSI_OK if the handshake completes or if
433 there are data to send to the peer, otherwise returns TSI_INCOMPLETE_DATA
434 which indicates that this method needs to be called again with more data
435 from the peer. In case of a fatal error in the handshake, another specific
436 error code is returned.
437 The caller is responsible for destroying the handshaker_result. However,
438 the caller should not free bytes_to_send, as the buffer is owned by the
439 tsi_handshaker object. */
440 tsi_result tsi_handshaker_next(
441 tsi_handshaker* self, const unsigned char* received_bytes,
442 size_t received_bytes_size, const unsigned char** bytes_to_send,
443 size_t* bytes_to_send_size, tsi_handshaker_result** handshaker_result,
444 tsi_handshaker_on_next_done_cb cb, void* user_data);
446 /* This method shuts down a TSI handshake that is in progress.
448 * This method will be invoked when TSI handshake should be terminated before
449 * being finished in order to free any resources being used.
451 void tsi_handshaker_shutdown(tsi_handshaker* self);
453 /* This method releases the tsi_handshaker object. After this method is called,
454 no other method can be called on the object. */
455 void tsi_handshaker_destroy(tsi_handshaker* self);
457 /* This method initializes the necessary shared objects used for tsi
461 /* This method destroys the shared objects created by tsi_init. */
464 #endif /* GRPC_CORE_TSI_TRANSPORT_SECURITY_INTERFACE_H */