-
Notifications
You must be signed in to change notification settings - Fork 364
/
tcti-device.c
544 lines (498 loc) · 19.4 KB
/
tcti-device.c
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
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2015 - 2018 Intel Corporation
* All rights reserved.
* Copyright (c) 2019, Wind River Systems.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 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 HOLDER 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h" // IWYU pragma: keep
#endif
#include <errno.h> // for errno
#include <fcntl.h> // for open, O_NONBLOCK, O_RDWR
#include <inttypes.h> // for uint8_t, int32_t
#include <stdbool.h> // for false, true
#include <stdio.h> // for NULL, size_t, ssize_t
#include <string.h> // for strerror, memcpy, memset
#ifdef __VXWORKS__
#include <sys/poll.h>
#else
#include <poll.h> // for pollfd, poll, POLLIN, POLLOUT
#endif
#include <unistd.h> // for read, close
#include "tcti-common.h" // for TSS2_TCTI_COMMON_CONTEXT, TPM_HEADER_SIZE
#include "tcti-device.h"
#include "tss2_common.h" // for TSS2_TCTI_RC_IO_ERROR, TSS2_RC_SUCCESS
#include "tss2_mu.h" // for Tss2_MU_UINT32_Unmarshal
#include "tss2_tcti.h" // for TSS2_TCTI_CONTEXT, TSS2_TCTI_POLL_HANDLE
#include "tss2_tcti_device.h" // for Tss2_Tcti_Device_Init
#include "util-io/io.h" // for write_all, TEMP_RETRY
#include "util/aux_util.h" // for UNUSED, ARRAY_LEN
#define LOGMODULE tcti
#include "util/log.h" // for LOG_ERROR, LOG_DEBUG, LOG_WARNING, LOG...
static char *default_conf[] = {
#ifdef __VXWORKS__
"/tpm0"
#else
"/dev/tpmrm0",
"/dev/tpm0",
"/dev/tcm0",
#endif /* __VX_WORKS__ */
};
/*
* This function wraps the "up-cast" of the opaque TCTI context type to the
* type for the mssim TCTI context. If passed a NULL context the function
* returns a NULL ptr. The function doesn't check magic number anymore
* It should checked by the appropriate tcti_common_checks.
*/
TSS2_TCTI_DEVICE_CONTEXT*
tcti_device_context_cast (TSS2_TCTI_CONTEXT *tcti_ctx)
{
if (tcti_ctx == NULL)
return NULL;
return (TSS2_TCTI_DEVICE_CONTEXT*)tcti_ctx;
}
/*
* This function down-casts the device TCTI context to the common context
* defined in the tcti-common module.
*/
TSS2_TCTI_COMMON_CONTEXT*
tcti_device_down_cast (TSS2_TCTI_DEVICE_CONTEXT *tcti_dev)
{
if (tcti_dev == NULL) {
return NULL;
}
return &tcti_dev->common;
}
TSS2_RC
tcti_device_transmit (
TSS2_TCTI_CONTEXT *tctiContext,
size_t command_size,
const uint8_t *command_buffer)
{
TSS2_TCTI_DEVICE_CONTEXT *tcti_dev = tcti_device_context_cast (tctiContext);
TSS2_TCTI_COMMON_CONTEXT *tcti_common = tcti_device_down_cast (tcti_dev);
TSS2_RC rc = TSS2_RC_SUCCESS;
size_t size;
rc = tcti_common_transmit_checks (tcti_common,
command_buffer,
TCTI_DEVICE_MAGIC);
if (rc != TSS2_RC_SUCCESS) {
return rc;
}
LOGBLOB_DEBUG (command_buffer,
command_size,
"sending %zu byte command buffer:",
command_size);
size = write_all (tcti_dev->fd,
command_buffer,
command_size);
if (size != command_size) {
LOG_ERROR ("wrong number of bytes written. Expected %zu, wrote %zd.",
command_size,
size);
return TSS2_TCTI_RC_IO_ERROR;
}
tcti_common->state = TCTI_STATE_RECEIVE;
return TSS2_RC_SUCCESS;
}
/*
* This receive function deviates from the spec a bit. Calling this function
* with a NULL 'tctiContext' parameter *should* result in the required size for
* the response buffer being returned to the caller. We would typically do this
* by reading the response's header and then returning the size to the caller.
* We can't do that on account of the TPM2 kernel driver closing any connection
* that doesn't read the whole response buffer in one 'read' call.
*
* Instead, if the caller queries the size, we return 4k just to be on the
* safe side. We do *not* however verify that the provided buffer is large
* enough to hold the full response (we can't). If the caller provides us with
* a buffer less than 4k we'll read as much of the response as we can given
* the size of the buffer. If we get enough of the response to read the size
* field, we check to see if the buffer was large enough to get the full
* response. If the response header claims it's larger than the provided
* buffer we print a warning. This allows "expert applications" to
* precalculate the required response buffer size for whatever commands they
* may send.
*/
TSS2_RC
tcti_device_receive (
TSS2_TCTI_CONTEXT *tctiContext,
size_t *response_size,
uint8_t *response_buffer,
int32_t timeout)
{
TSS2_TCTI_DEVICE_CONTEXT *tcti_dev = tcti_device_context_cast (tctiContext);
TSS2_TCTI_COMMON_CONTEXT *tcti_common = tcti_device_down_cast (tcti_dev);
TSS2_RC rc = TSS2_RC_SUCCESS;
ssize_t size = 0;
struct pollfd fds;
int rc_poll, nfds = 1;
uint8_t header[TPM_HEADER_SIZE];
size_t offset = 2;
UINT32 partial_size;
rc = tcti_common_receive_checks (tcti_common,
response_size,
TCTI_DEVICE_MAGIC);
if (rc != TSS2_RC_SUCCESS) {
return rc;
}
if (!response_buffer) {
if (!tcti_common->partial_read_supported) {
LOG_DEBUG("Partial read not supported ");
*response_size = 4096;
return TSS2_RC_SUCCESS;
} else {
/* Read the header only and get the response size out of it */
LOG_DEBUG("Partial read - reading response size");
fds.fd = tcti_dev->fd;
fds.events = POLLIN;
rc_poll = poll(&fds, nfds, timeout);
if (rc_poll < 0) {
LOG_ERROR ("Failed to poll for response from fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror(errno));
return TSS2_TCTI_RC_IO_ERROR;
} else if (rc_poll == 0) {
LOG_INFO ("Poll timed out on fd %d.", tcti_dev->fd);
return TSS2_TCTI_RC_TRY_AGAIN;
} else if (fds.revents == POLLIN) {
TEMP_RETRY (size, read (tcti_dev->fd, header, TPM_HEADER_SIZE));
if (size < 0 || size != TPM_HEADER_SIZE) {
LOG_ERROR ("Failed to get response size fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror (errno));
return TSS2_TCTI_RC_IO_ERROR;
}
} else {
LOG_ERROR ("Header could not be received");
return TSS2_TCTI_RC_GENERAL_FAILURE;
}
LOG_DEBUG("Partial read - received header");
rc = Tss2_MU_UINT32_Unmarshal(header, TPM_HEADER_SIZE,
&offset, &partial_size);
if (rc != TSS2_RC_SUCCESS) {
LOG_ERROR ("Failed to unmarshal response size.");
return rc;
}
if (partial_size < TPM_HEADER_SIZE) {
LOG_ERROR ("Received %zu bytes, not enough to hold a TPM2"
" response header.", size);
return TSS2_TCTI_RC_GENERAL_FAILURE;
}
LOG_DEBUG("Partial read - received response size %d.", partial_size);
tcti_common->partial = true;
*response_size = partial_size;
memcpy(&tcti_common->header, header, TPM_HEADER_SIZE);
return rc;
}
}
/* In case when the whole response is just the 10 bytes header
* and we have read it already to get the size, we don't need
* to call poll and read again. Just copy what we have read
* and return.
*/
if (tcti_common->partial == true && *response_size == TPM_HEADER_SIZE) {
memcpy(response_buffer, &tcti_common->header, TPM_HEADER_SIZE);
tcti_common->partial = false;
goto out;
}
/*
* The older kernel driver will only return a response buffer in a single
* read operation. If we try to read again before sending another command
* the kernel will close the file descriptor and we'll get an EOF.
* Newer kernels should have partial reads enabled.
*/
fds.fd = tcti_dev->fd;
fds.events = POLLIN;
rc_poll = poll(&fds, nfds, timeout);
if (rc_poll < 0) {
LOG_ERROR ("Failed to poll for response from fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror (errno));
return TSS2_TCTI_RC_IO_ERROR;
} else if (rc_poll == 0) {
LOG_INFO ("Poll timed out on fd %d.", tcti_dev->fd);
return TSS2_TCTI_RC_TRY_AGAIN;
} else if (fds.revents == POLLIN) {
if (tcti_common->partial == true) {
memcpy(response_buffer, &tcti_common->header, TPM_HEADER_SIZE);
TEMP_RETRY (size, read (tcti_dev->fd, response_buffer +
TPM_HEADER_SIZE, *response_size - TPM_HEADER_SIZE));
} else {
TEMP_RETRY (size, read (tcti_dev->fd, response_buffer,
*response_size));
}
if (size < 0) {
LOG_ERROR ("Failed to read response from fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror (errno));
return TSS2_TCTI_RC_IO_ERROR;
}
}
if (size == 0) {
LOG_WARNING ("Got EOF instead of response.");
rc = TSS2_TCTI_RC_NO_CONNECTION;
goto out;
}
size += tcti_common->partial ? TPM_HEADER_SIZE : 0;
LOGBLOB_DEBUG(response_buffer, size, "Response Received");
tcti_common->partial = false;
if ((size_t)size < TPM_HEADER_SIZE) {
LOG_ERROR ("Received %zu bytes, not enough to hold a TPM2 response "
"header.", size);
rc = TSS2_TCTI_RC_GENERAL_FAILURE;
goto out;
}
rc = header_unmarshal (response_buffer, &tcti_common->header);
if (rc != TSS2_RC_SUCCESS)
goto out;
LOG_DEBUG("Size from header %u bytes read %zu", tcti_common->header.size, size);
if ((size_t)size != tcti_common->header.size) {
LOG_WARNING ("TPM2 response size disagrees with number of bytes read "
"from fd %d. Header says %u but we read %zu bytes.",
tcti_dev->fd, tcti_common->header.size, size);
}
if (*response_size < tcti_common->header.size) {
LOG_WARNING ("TPM2 response size is larger than the provided "
"buffer: future use of this TCTI will likely fail.");
rc = TSS2_TCTI_RC_GENERAL_FAILURE;
}
*response_size = size;
/*
* Executing code beyond this point transitions the state machine to
* TRANSMIT. Another call to this function will not be possible until
* another command is sent to the TPM.
*/
out:
tcti_common->state = TCTI_STATE_TRANSMIT;
return rc;
}
static void close_tpm(int *fd)
{
if (fd == NULL || *fd < 0) {
return;
}
close(*fd);
*fd = -1;
}
void
tcti_device_finalize (
TSS2_TCTI_CONTEXT *tctiContext)
{
TSS2_TCTI_DEVICE_CONTEXT *tcti_dev = tcti_device_context_cast (tctiContext);
TSS2_TCTI_COMMON_CONTEXT *tcti_common = tcti_device_down_cast (tcti_dev);
if (tcti_dev == NULL) {
return;
}
close_tpm (&tcti_dev->fd);
tcti_common->state = TCTI_STATE_FINAL;
}
TSS2_RC
tcti_device_cancel (
TSS2_TCTI_CONTEXT *tctiContext)
{
/* Linux driver doesn't expose a mechanism to cancel commands. */
UNUSED(tctiContext);
return TSS2_TCTI_RC_NOT_IMPLEMENTED;
}
TSS2_RC
tcti_device_get_poll_handles (
TSS2_TCTI_CONTEXT *tctiContext,
TSS2_TCTI_POLL_HANDLE *handles,
size_t *num_handles)
{
TSS2_TCTI_DEVICE_CONTEXT *tcti_dev = tcti_device_context_cast (tctiContext);
if (num_handles == NULL || tcti_dev == NULL) {
return TSS2_TCTI_RC_BAD_REFERENCE;
}
if (handles != NULL && *num_handles < 1) {
return TSS2_TCTI_RC_INSUFFICIENT_BUFFER;
}
*num_handles = 1;
if (handles != NULL) {
handles->fd = tcti_dev->fd;
handles->events = POLLIN | POLLOUT;
}
return TSS2_RC_SUCCESS;
}
TSS2_RC
tcti_device_set_locality (
TSS2_TCTI_CONTEXT *tctiContext,
uint8_t locality)
{
/*
* Linux driver doesn't expose a mechanism for user space applications
* to set locality.
*/
UNUSED(tctiContext);
UNUSED(locality);
return TSS2_TCTI_RC_NOT_IMPLEMENTED;
}
static int open_tpm (
const char* pathname) {
#ifdef __VXWORKS__
return open (pathname, O_RDWR | O_NONBLOCK, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP));
#else
return open (pathname, O_RDWR | O_NONBLOCK);
#endif
}
TSS2_RC
Tss2_Tcti_Device_Init (
TSS2_TCTI_CONTEXT *tctiContext,
size_t *size,
const char *conf)
{
TSS2_TCTI_DEVICE_CONTEXT *tcti_dev;
TSS2_TCTI_COMMON_CONTEXT *tcti_common;
char *used_conf = NULL;
if (tctiContext == NULL && size == NULL) {
return TSS2_TCTI_RC_BAD_VALUE;
} else if (tctiContext == NULL) {
*size = sizeof (TSS2_TCTI_DEVICE_CONTEXT);
return TSS2_RC_SUCCESS;
}
/* Init TCTI context */
TSS2_TCTI_MAGIC (tctiContext) = TCTI_DEVICE_MAGIC;
TSS2_TCTI_VERSION (tctiContext) = TCTI_VERSION;
TSS2_TCTI_TRANSMIT (tctiContext) = tcti_device_transmit;
TSS2_TCTI_RECEIVE (tctiContext) = tcti_device_receive;
TSS2_TCTI_FINALIZE (tctiContext) = tcti_device_finalize;
TSS2_TCTI_CANCEL (tctiContext) = tcti_device_cancel;
TSS2_TCTI_GET_POLL_HANDLES (tctiContext) = tcti_device_get_poll_handles;
TSS2_TCTI_SET_LOCALITY (tctiContext) = tcti_device_set_locality;
TSS2_TCTI_MAKE_STICKY (tctiContext) = tcti_make_sticky_not_implemented;
tcti_dev = tcti_device_context_cast (tctiContext);
tcti_common = tcti_device_down_cast (tcti_dev);
tcti_common->state = TCTI_STATE_TRANSMIT;
memset (&tcti_common->header, 0, sizeof (tcti_common->header));
tcti_common->locality = 3;
tcti_common->partial = false;
if (conf == NULL) {
LOG_TRACE ("No TCTI device file specified");
for (size_t i = 0; i < ARRAY_LEN(default_conf); i++) {
LOG_DEBUG ("Trying to open default TCTI device file %s",
default_conf[i]);
tcti_dev->fd = open_tpm (default_conf[i]);
if (tcti_dev->fd >= 0) {
LOG_TRACE ("Successfully opened default TCTI device file %s",
default_conf[i]);
used_conf = default_conf[i];
break;
} else {
LOG_WARNING ("Failed to open default TCTI device file %s: %s",
default_conf[i], strerror (errno));
}
}
if (tcti_dev->fd < 0) {
LOG_ERROR ("Could not open any default TCTI device file");
return TSS2_TCTI_RC_IO_ERROR;
}
} else {
LOG_DEBUG ("Trying to open specified TCTI device file %s", conf);
tcti_dev->fd = open_tpm (conf);
if (tcti_dev->fd < 0) {
LOG_ERROR ("Failed to open specified TCTI device file %s: %s",
conf, strerror (errno));
return TSS2_TCTI_RC_IO_ERROR;
} else {
LOG_TRACE ("Successfully opened specified TCTI device file %s", conf);
}
used_conf = (char *)conf;
}
/* probe if the device support partial response read */
LOG_DEBUG ("Probe device for partial response read support");
uint8_t cmd[12] = { "\x80\x01\x00\x00\x00\x0c\x00\x00\x01\x7b\x00\x08" };
uint8_t rsp[20] = {0};
struct pollfd fds;
int rc_poll, nfds = 1;
ssize_t sz = (ssize_t) write_all (tcti_dev->fd, cmd, sizeof(cmd));
if (sz != sizeof(cmd)) {
LOG_ERROR ("Could not probe device for partial response read support");
close_tpm (&tcti_dev->fd);
return TSS2_TCTI_RC_IO_ERROR;
}
LOG_DEBUG ("Command sent, reading header");
fds.fd = tcti_dev->fd;
fds.events = POLLIN;
rc_poll = poll(&fds, nfds, 1000); /* Wait 1 sec */
if (rc_poll < 0 || rc_poll == 0) {
LOG_ERROR ("Failed to poll for response from fd %d, rc %d, errno %d: %s",
tcti_dev->fd, rc_poll, errno, strerror(errno));
close_tpm (&tcti_dev->fd);
return TSS2_TCTI_RC_IO_ERROR;
} else if (fds.revents == POLLIN) {
TEMP_RETRY (sz, read (tcti_dev->fd, rsp, TPM_HEADER_SIZE));
if (sz < 0 || sz != TPM_HEADER_SIZE) {
LOG_ERROR ("Failed to read response header fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror (errno));
close_tpm (&tcti_dev->fd);
return TSS2_TCTI_RC_IO_ERROR;
}
}
LOG_DEBUG ("Header read, reading rest of response");
fds.fd = tcti_dev->fd;
fds.events = POLLIN;
sz = 0;
rc_poll = poll(&fds, nfds, 1000); /* Wait 1 sec */
if (rc_poll < 0) {
LOG_DEBUG ("Failed to poll for response from fd %d, rc %d, errno %d: %s",
tcti_dev->fd, rc_poll, errno, strerror(errno));
close_tpm (&tcti_dev->fd);
return TSS2_TCTI_RC_IO_ERROR;
} else if (rc_poll == 0) {
LOG_ERROR ("timeout waiting for response from fd %d", tcti_dev->fd);
} else if (fds.revents == POLLIN) {
TEMP_RETRY (sz, read (tcti_dev->fd, rsp + TPM_HEADER_SIZE,
sizeof(rsp) - TPM_HEADER_SIZE));
}
if (sz <= 0) {
/* partial read not supported. Reset the connection */
LOG_DEBUG ("Failed to get response tail fd %d, got errno %d: %s",
tcti_dev->fd, errno, strerror (errno));
tcti_common->partial_read_supported = 0;
close_tpm (&tcti_dev->fd);
tcti_dev->fd = open_tpm (used_conf);
if (tcti_dev->fd < 0) {
LOG_ERROR ("Failed to open specified TCTI device file %s: %s",
used_conf, strerror (errno));
return TSS2_TCTI_RC_IO_ERROR;
}
} else {
/* partial read supported. */
LOG_DEBUG ("Read the rest - partial read supported");
tcti_common->partial_read_supported = 1;
}
return TSS2_RC_SUCCESS;
}
const TSS2_TCTI_INFO tss2_tcti_info = {
.version = TCTI_VERSION,
.name = "tcti-device",
.description = "TCTI module for communication with Linux kernel interface.",
.config_help = "Path to TPM character device. Default value is: "
"TCTI_DEVICE_DEFAULT",
.init = Tss2_Tcti_Device_Init,
};
const TSS2_TCTI_INFO*
Tss2_Tcti_Info (void)
{
return &tss2_tcti_info;
}