1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
|
/*
*
* 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/lib/security/transport/secure_endpoint.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>
#include <grpc/support/slice_buffer.h>
#include <grpc/support/sync.h>
#include "src/core/lib/debug/trace.h"
#include "src/core/lib/security/transport/tsi_error.h"
#include "src/core/lib/support/string.h"
#include "src/core/lib/tsi/transport_security_interface.h"
#define STAGING_BUFFER_SIZE 8192
typedef struct {
grpc_endpoint base;
grpc_endpoint *wrapped_ep;
struct tsi_frame_protector *protector;
gpr_mu protector_mu;
/* saved upper level callbacks and user_data. */
grpc_closure *read_cb;
grpc_closure *write_cb;
grpc_closure on_read;
gpr_slice_buffer *read_buffer;
gpr_slice_buffer source_buffer;
/* saved handshaker leftover data to unprotect. */
gpr_slice_buffer leftover_bytes;
/* buffers for read and write */
gpr_slice read_staging_buffer;
gpr_slice write_staging_buffer;
gpr_slice_buffer output_buffer;
gpr_refcount ref;
} secure_endpoint;
int grpc_trace_secure_endpoint = 0;
static void destroy(grpc_exec_ctx *exec_ctx, secure_endpoint *secure_ep) {
secure_endpoint *ep = secure_ep;
grpc_endpoint_destroy(exec_ctx, ep->wrapped_ep);
tsi_frame_protector_destroy(ep->protector);
gpr_slice_buffer_destroy(&ep->leftover_bytes);
gpr_slice_unref(ep->read_staging_buffer);
gpr_slice_unref(ep->write_staging_buffer);
gpr_slice_buffer_destroy(&ep->output_buffer);
gpr_slice_buffer_destroy(&ep->source_buffer);
gpr_mu_destroy(&ep->protector_mu);
gpr_free(ep);
}
/*#define GRPC_SECURE_ENDPOINT_REFCOUNT_DEBUG*/
#ifdef GRPC_SECURE_ENDPOINT_REFCOUNT_DEBUG
#define SECURE_ENDPOINT_UNREF(exec_ctx, ep, reason) \
secure_endpoint_unref((exec_ctx), (ep), (reason), __FILE__, __LINE__)
#define SECURE_ENDPOINT_REF(ep, reason) \
secure_endpoint_ref((ep), (reason), __FILE__, __LINE__)
static void secure_endpoint_unref(secure_endpoint *ep,
grpc_closure_list *closure_list,
const char *reason, const char *file,
int line) {
gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "SECENDP unref %p : %s %d -> %d",
ep, reason, ep->ref.count, ep->ref.count - 1);
if (gpr_unref(&ep->ref)) {
destroy(exec_ctx, ep);
}
}
static void secure_endpoint_ref(secure_endpoint *ep, const char *reason,
const char *file, int line) {
gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "SECENDP ref %p : %s %d -> %d",
ep, reason, ep->ref.count, ep->ref.count + 1);
gpr_ref(&ep->ref);
}
#else
#define SECURE_ENDPOINT_UNREF(exec_ctx, ep, reason) \
secure_endpoint_unref((exec_ctx), (ep))
#define SECURE_ENDPOINT_REF(ep, reason) secure_endpoint_ref((ep))
static void secure_endpoint_unref(grpc_exec_ctx *exec_ctx,
secure_endpoint *ep) {
if (gpr_unref(&ep->ref)) {
destroy(exec_ctx, ep);
}
}
static void secure_endpoint_ref(secure_endpoint *ep) { gpr_ref(&ep->ref); }
#endif
static void flush_read_staging_buffer(secure_endpoint *ep, uint8_t **cur,
uint8_t **end) {
gpr_slice_buffer_add(ep->read_buffer, ep->read_staging_buffer);
ep->read_staging_buffer = gpr_slice_malloc(STAGING_BUFFER_SIZE);
*cur = GPR_SLICE_START_PTR(ep->read_staging_buffer);
*end = GPR_SLICE_END_PTR(ep->read_staging_buffer);
}
static void call_read_cb(grpc_exec_ctx *exec_ctx, secure_endpoint *ep,
grpc_error *error) {
if (grpc_trace_secure_endpoint) {
size_t i;
for (i = 0; i < ep->read_buffer->count; i++) {
char *data = gpr_dump_slice(ep->read_buffer->slices[i],
GPR_DUMP_HEX | GPR_DUMP_ASCII);
gpr_log(GPR_DEBUG, "READ %p: %s", ep, data);
gpr_free(data);
}
}
ep->read_buffer = NULL;
grpc_exec_ctx_push(exec_ctx, ep->read_cb, error, NULL);
SECURE_ENDPOINT_UNREF(exec_ctx, ep, "read");
}
static void on_read(grpc_exec_ctx *exec_ctx, void *user_data,
grpc_error *error) {
unsigned i;
uint8_t keep_looping = 0;
tsi_result result = TSI_OK;
secure_endpoint *ep = (secure_endpoint *)user_data;
uint8_t *cur = GPR_SLICE_START_PTR(ep->read_staging_buffer);
uint8_t *end = GPR_SLICE_END_PTR(ep->read_staging_buffer);
if (error != GRPC_ERROR_NONE) {
gpr_slice_buffer_reset_and_unref(ep->read_buffer);
call_read_cb(exec_ctx, ep, GRPC_ERROR_CREATE_REFERENCING(
"Secure read failed", &error, 1));
return;
}
/* TODO(yangg) check error, maybe bail out early */
for (i = 0; i < ep->source_buffer.count; i++) {
gpr_slice encrypted = ep->source_buffer.slices[i];
uint8_t *message_bytes = GPR_SLICE_START_PTR(encrypted);
size_t message_size = GPR_SLICE_LENGTH(encrypted);
while (message_size > 0 || keep_looping) {
size_t unprotected_buffer_size_written = (size_t)(end - cur);
size_t processed_message_size = message_size;
gpr_mu_lock(&ep->protector_mu);
result = tsi_frame_protector_unprotect(ep->protector, message_bytes,
&processed_message_size, cur,
&unprotected_buffer_size_written);
gpr_mu_unlock(&ep->protector_mu);
if (result != TSI_OK) {
gpr_log(GPR_ERROR, "Decryption error: %s",
tsi_result_to_string(result));
break;
}
message_bytes += processed_message_size;
message_size -= processed_message_size;
cur += unprotected_buffer_size_written;
if (cur == end) {
flush_read_staging_buffer(ep, &cur, &end);
/* Force to enter the loop again to extract buffered bytes in protector.
The bytes could be buffered because of running out of staging_buffer.
If this happens at the end of all slices, doing another unprotect
avoids leaving data in the protector. */
keep_looping = 1;
} else if (unprotected_buffer_size_written > 0) {
keep_looping = 1;
} else {
keep_looping = 0;
}
}
if (result != TSI_OK) break;
}
if (cur != GPR_SLICE_START_PTR(ep->read_staging_buffer)) {
gpr_slice_buffer_add(
ep->read_buffer,
gpr_slice_split_head(
&ep->read_staging_buffer,
(size_t)(cur - GPR_SLICE_START_PTR(ep->read_staging_buffer))));
}
/* TODO(yangg) experiment with moving this block after read_cb to see if it
helps latency */
gpr_slice_buffer_reset_and_unref(&ep->source_buffer);
if (result != TSI_OK) {
gpr_slice_buffer_reset_and_unref(ep->read_buffer);
call_read_cb(exec_ctx, ep, grpc_set_tsi_error_bits(
GRPC_ERROR_CREATE("Unwrap failed"), result));
return;
}
call_read_cb(exec_ctx, ep, GRPC_ERROR_NONE);
}
static void endpoint_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *secure_ep,
gpr_slice_buffer *slices, grpc_closure *cb) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
ep->read_cb = cb;
ep->read_buffer = slices;
gpr_slice_buffer_reset_and_unref(ep->read_buffer);
SECURE_ENDPOINT_REF(ep, "read");
if (ep->leftover_bytes.count) {
gpr_slice_buffer_swap(&ep->leftover_bytes, &ep->source_buffer);
GPR_ASSERT(ep->leftover_bytes.count == 0);
on_read(exec_ctx, ep, GRPC_ERROR_NONE);
return;
}
grpc_endpoint_read(exec_ctx, ep->wrapped_ep, &ep->source_buffer,
&ep->on_read);
}
static void flush_write_staging_buffer(secure_endpoint *ep, uint8_t **cur,
uint8_t **end) {
gpr_slice_buffer_add(&ep->output_buffer, ep->write_staging_buffer);
ep->write_staging_buffer = gpr_slice_malloc(STAGING_BUFFER_SIZE);
*cur = GPR_SLICE_START_PTR(ep->write_staging_buffer);
*end = GPR_SLICE_END_PTR(ep->write_staging_buffer);
}
static void endpoint_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *secure_ep,
gpr_slice_buffer *slices, grpc_closure *cb) {
unsigned i;
tsi_result result = TSI_OK;
secure_endpoint *ep = (secure_endpoint *)secure_ep;
uint8_t *cur = GPR_SLICE_START_PTR(ep->write_staging_buffer);
uint8_t *end = GPR_SLICE_END_PTR(ep->write_staging_buffer);
gpr_slice_buffer_reset_and_unref(&ep->output_buffer);
if (grpc_trace_secure_endpoint) {
for (i = 0; i < slices->count; i++) {
char *data =
gpr_dump_slice(slices->slices[i], GPR_DUMP_HEX | GPR_DUMP_ASCII);
gpr_log(GPR_DEBUG, "WRITE %p: %s", ep, data);
gpr_free(data);
}
}
for (i = 0; i < slices->count; i++) {
gpr_slice plain = slices->slices[i];
uint8_t *message_bytes = GPR_SLICE_START_PTR(plain);
size_t message_size = GPR_SLICE_LENGTH(plain);
while (message_size > 0) {
size_t protected_buffer_size_to_send = (size_t)(end - cur);
size_t processed_message_size = message_size;
gpr_mu_lock(&ep->protector_mu);
result = tsi_frame_protector_protect(ep->protector, message_bytes,
&processed_message_size, cur,
&protected_buffer_size_to_send);
gpr_mu_unlock(&ep->protector_mu);
if (result != TSI_OK) {
gpr_log(GPR_ERROR, "Encryption error: %s",
tsi_result_to_string(result));
break;
}
message_bytes += processed_message_size;
message_size -= processed_message_size;
cur += protected_buffer_size_to_send;
if (cur == end) {
flush_write_staging_buffer(ep, &cur, &end);
}
}
if (result != TSI_OK) break;
}
if (result == TSI_OK) {
size_t still_pending_size;
do {
size_t protected_buffer_size_to_send = (size_t)(end - cur);
gpr_mu_lock(&ep->protector_mu);
result = tsi_frame_protector_protect_flush(ep->protector, cur,
&protected_buffer_size_to_send,
&still_pending_size);
gpr_mu_unlock(&ep->protector_mu);
if (result != TSI_OK) break;
cur += protected_buffer_size_to_send;
if (cur == end) {
flush_write_staging_buffer(ep, &cur, &end);
}
} while (still_pending_size > 0);
if (cur != GPR_SLICE_START_PTR(ep->write_staging_buffer)) {
gpr_slice_buffer_add(
&ep->output_buffer,
gpr_slice_split_head(
&ep->write_staging_buffer,
(size_t)(cur - GPR_SLICE_START_PTR(ep->write_staging_buffer))));
}
}
if (result != TSI_OK) {
/* TODO(yangg) do different things according to the error type? */
gpr_slice_buffer_reset_and_unref(&ep->output_buffer);
grpc_exec_ctx_push(
exec_ctx, cb,
grpc_set_tsi_error_bits(GRPC_ERROR_CREATE("Wrap failed"), result),
NULL);
return;
}
grpc_endpoint_write(exec_ctx, ep->wrapped_ep, &ep->output_buffer, cb);
}
static void endpoint_shutdown(grpc_exec_ctx *exec_ctx,
grpc_endpoint *secure_ep) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
grpc_endpoint_shutdown(exec_ctx, ep->wrapped_ep);
}
static void endpoint_destroy(grpc_exec_ctx *exec_ctx,
grpc_endpoint *secure_ep) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
SECURE_ENDPOINT_UNREF(exec_ctx, ep, "destroy");
}
static void endpoint_add_to_pollset(grpc_exec_ctx *exec_ctx,
grpc_endpoint *secure_ep,
grpc_pollset *pollset) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
grpc_endpoint_add_to_pollset(exec_ctx, ep->wrapped_ep, pollset);
}
static void endpoint_add_to_pollset_set(grpc_exec_ctx *exec_ctx,
grpc_endpoint *secure_ep,
grpc_pollset_set *pollset_set) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
grpc_endpoint_add_to_pollset_set(exec_ctx, ep->wrapped_ep, pollset_set);
}
static char *endpoint_get_peer(grpc_endpoint *secure_ep) {
secure_endpoint *ep = (secure_endpoint *)secure_ep;
return grpc_endpoint_get_peer(ep->wrapped_ep);
}
static const grpc_endpoint_vtable vtable = {
endpoint_read, endpoint_write,
endpoint_add_to_pollset, endpoint_add_to_pollset_set,
endpoint_shutdown, endpoint_destroy,
endpoint_get_peer};
grpc_endpoint *grpc_secure_endpoint_create(
struct tsi_frame_protector *protector, grpc_endpoint *transport,
gpr_slice *leftover_slices, size_t leftover_nslices) {
size_t i;
secure_endpoint *ep = (secure_endpoint *)gpr_malloc(sizeof(secure_endpoint));
ep->base.vtable = &vtable;
ep->wrapped_ep = transport;
ep->protector = protector;
gpr_slice_buffer_init(&ep->leftover_bytes);
for (i = 0; i < leftover_nslices; i++) {
gpr_slice_buffer_add(&ep->leftover_bytes,
gpr_slice_ref(leftover_slices[i]));
}
ep->write_staging_buffer = gpr_slice_malloc(STAGING_BUFFER_SIZE);
ep->read_staging_buffer = gpr_slice_malloc(STAGING_BUFFER_SIZE);
gpr_slice_buffer_init(&ep->output_buffer);
gpr_slice_buffer_init(&ep->source_buffer);
ep->read_buffer = NULL;
grpc_closure_init(&ep->on_read, on_read, ep);
gpr_mu_init(&ep->protector_mu);
gpr_ref_init(&ep->ref, 1);
return &ep->base;
}
|