aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/lib/tsi/transport_security.c
blob: a2c0d4619697b8d200231b697b0e0890c350d483 (plain)
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
/*
 *
 * 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/lib/tsi/transport_security.h"

#include <stdlib.h>
#include <string.h>

/* --- Tracing. --- */

int tsi_tracing_enabled = 0;

/* --- Utils. --- */

char *tsi_strdup(const char *src) {
  char *dst;
  size_t len;
  if (!src) return NULL;
  len = strlen(src) + 1;
  dst = malloc(len);
  if (!dst) return NULL;
  memcpy(dst, src, len);
  return dst;
}

/* --- tsi_result common implementation. --- */

const char *tsi_result_to_string(tsi_result result) {
  switch (result) {
    case TSI_OK:
      return "TSI_OK";
    case TSI_UNKNOWN_ERROR:
      return "TSI_UNKNOWN_ERROR";
    case TSI_INVALID_ARGUMENT:
      return "TSI_INVALID_ARGUMENT";
    case TSI_PERMISSION_DENIED:
      return "TSI_PERMISSION_DENIED";
    case TSI_INCOMPLETE_DATA:
      return "TSI_INCOMPLETE_DATA";
    case TSI_FAILED_PRECONDITION:
      return "TSI_FAILED_PRECONDITION";
    case TSI_UNIMPLEMENTED:
      return "TSI_UNIMPLEMENTED";
    case TSI_INTERNAL_ERROR:
      return "TSI_INTERNAL_ERROR";
    case TSI_DATA_CORRUPTED:
      return "TSI_DATA_CORRUPTED";
    case TSI_NOT_FOUND:
      return "TSI_NOT_FOUND";
    case TSI_PROTOCOL_FAILURE:
      return "TSI_PROTOCOL_FAILURE";
    case TSI_HANDSHAKE_IN_PROGRESS:
      return "TSI_HANDSHAKE_IN_PROGRESS";
    case TSI_OUT_OF_RESOURCES:
      return "TSI_OUT_OF_RESOURCES";
    default:
      return "UNKNOWN";
  }
}

/* --- tsi_frame_protector common implementation. ---

   Calls specific implementation after state/input validation. */

tsi_result tsi_frame_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) {
  if (self == NULL || unprotected_bytes == NULL ||
      unprotected_bytes_size == NULL || protected_output_frames == NULL ||
      protected_output_frames_size == NULL) {
    return TSI_INVALID_ARGUMENT;
  }
  return self->vtable->protect(self, unprotected_bytes, unprotected_bytes_size,
                               protected_output_frames,
                               protected_output_frames_size);
}

tsi_result tsi_frame_protector_protect_flush(
    tsi_frame_protector *self, unsigned char *protected_output_frames,
    size_t *protected_output_frames_size, size_t *still_pending_size) {
  if (self == NULL || protected_output_frames == NULL ||
      protected_output_frames == NULL || still_pending_size == NULL) {
    return TSI_INVALID_ARGUMENT;
  }
  return self->vtable->protect_flush(self, protected_output_frames,
                                     protected_output_frames_size,
                                     still_pending_size);
}

tsi_result tsi_frame_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) {
  if (self == NULL || protected_frames_bytes == NULL ||
      protected_frames_bytes_size == NULL || unprotected_bytes == NULL ||
      unprotected_bytes_size == NULL) {
    return TSI_INVALID_ARGUMENT;
  }
  return self->vtable->unprotect(self, protected_frames_bytes,
                                 protected_frames_bytes_size, unprotected_bytes,
                                 unprotected_bytes_size);
}

void tsi_frame_protector_destroy(tsi_frame_protector *self) {
  if (self == NULL) return;
  self->vtable->destroy(self);
}

/* --- tsi_handshaker common implementation. ---

   Calls specific implementation after state/input validation. */

tsi_result tsi_handshaker_get_bytes_to_send_to_peer(tsi_handshaker *self,
                                                    unsigned char *bytes,
                                                    size_t *bytes_size) {
  if (self == NULL || bytes == NULL || bytes_size == NULL) {
    return TSI_INVALID_ARGUMENT;
  }
  if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
  return self->vtable->get_bytes_to_send_to_peer(self, bytes, bytes_size);
}

tsi_result tsi_handshaker_process_bytes_from_peer(tsi_handshaker *self,
                                                  const unsigned char *bytes,
                                                  size_t *bytes_size) {
  if (self == NULL || bytes == NULL || bytes_size == NULL) {
    return TSI_INVALID_ARGUMENT;
  }
  if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
  return self->vtable->process_bytes_from_peer(self, bytes, bytes_size);
}

tsi_result tsi_handshaker_get_result(tsi_handshaker *self) {
  if (self == NULL) return TSI_INVALID_ARGUMENT;
  if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
  return self->vtable->get_result(self);
}

tsi_result tsi_handshaker_extract_peer(tsi_handshaker *self, tsi_peer *peer) {
  if (self == NULL || peer == NULL) return TSI_INVALID_ARGUMENT;
  memset(peer, 0, sizeof(tsi_peer));
  if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
  if (tsi_handshaker_get_result(self) != TSI_OK) {
    return TSI_FAILED_PRECONDITION;
  }
  return self->vtable->extract_peer(self, peer);
}

tsi_result tsi_handshaker_create_frame_protector(
    tsi_handshaker *self, size_t *max_protected_frame_size,
    tsi_frame_protector **protector) {
  tsi_result result;
  if (self == NULL || protector == NULL) return TSI_INVALID_ARGUMENT;
  if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
  if (tsi_handshaker_get_result(self) != TSI_OK) {
    return TSI_FAILED_PRECONDITION;
  }
  result = self->vtable->create_frame_protector(self, max_protected_frame_size,
                                                protector);
  if (result == TSI_OK) {
    self->frame_protector_created = 1;
  }
  return result;
}

void tsi_handshaker_destroy(tsi_handshaker *self) {
  if (self == NULL) return;
  self->vtable->destroy(self);
}

/* --- tsi_peer implementation. --- */

tsi_peer_property tsi_init_peer_property(void) {
  tsi_peer_property property;
  memset(&property, 0, sizeof(tsi_peer_property));
  return property;
}

static void tsi_peer_destroy_list_property(tsi_peer_property *children,
                                           size_t child_count) {
  size_t i;
  for (i = 0; i < child_count; i++) {
    tsi_peer_property_destruct(&children[i]);
  }
  free(children);
}

void tsi_peer_property_destruct(tsi_peer_property *property) {
  if (property->name != NULL) {
    free(property->name);
  }
  if (property->value.data != NULL) {
    free(property->value.data);
  }
  *property = tsi_init_peer_property(); /* Reset everything to 0. */
}

void tsi_peer_destruct(tsi_peer *self) {
  if (self == NULL) return;
  if (self->properties != NULL) {
    tsi_peer_destroy_list_property(self->properties, self->property_count);
    self->properties = NULL;
  }
  self->property_count = 0;
}

tsi_result tsi_construct_allocated_string_peer_property(
    const char *name, size_t value_length, tsi_peer_property *property) {
  *property = tsi_init_peer_property();
  if (name != NULL) {
    property->name = tsi_strdup(name);
    if (property->name == NULL) return TSI_OUT_OF_RESOURCES;
  }
  if (value_length > 0) {
    property->value.data = calloc(1, value_length);
    if (property->value.data == NULL) {
      tsi_peer_property_destruct(property);
      return TSI_OUT_OF_RESOURCES;
    }
    property->value.length = value_length;
  }
  return TSI_OK;
}

tsi_result tsi_construct_string_peer_property_from_cstring(
    const char *name, const char *value, tsi_peer_property *property) {
  return tsi_construct_string_peer_property(name, value, strlen(value),
                                            property);
}

tsi_result tsi_construct_string_peer_property(const char *name,
                                              const char *value,
                                              size_t value_length,
                                              tsi_peer_property *property) {
  tsi_result result = tsi_construct_allocated_string_peer_property(
      name, value_length, property);
  if (result != TSI_OK) return result;
  if (value_length > 0) {
    memcpy(property->value.data, value, value_length);
  }
  return TSI_OK;
}

tsi_result tsi_construct_peer(size_t property_count, tsi_peer *peer) {
  memset(peer, 0, sizeof(tsi_peer));
  if (property_count > 0) {
    peer->properties = calloc(property_count, sizeof(tsi_peer_property));
    if (peer->properties == NULL) return TSI_OUT_OF_RESOURCES;
    peer->property_count = property_count;
  }
  return TSI_OK;
}