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
|
/*
* Licensed Materials - Property of IBM
*
* trousers - An open source TCG Software Stack
*
* (C) Copyright International Business Machines Corp. 2004
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include "trousers/tss.h"
#include "trousers_types.h"
#include "tcs_tsp.h"
#include "tcs_utils.h"
#include "tcs_int_literals.h"
#include "capabilities.h"
#include "tcsd_wrap.h"
#include "tcsd.h"
#include "tcslog.h"
#include "tcsem.h"
struct event_log *tcs_event_log = NULL;
TSS_RESULT
event_log_init()
{
if (tcs_event_log != NULL)
return TSS_SUCCESS;
tcs_event_log = calloc(1, sizeof(struct event_log));
if (tcs_event_log == NULL) {
LogError("malloc of %zd bytes failed.", sizeof(struct event_log));
return TCSERR(TSS_E_OUTOFMEMORY);
}
MUTEX_INIT(tcs_event_log->lock);
/* allocate as many event lists as there are PCR's */
tcs_event_log->lists = calloc(tpm_metrics.num_pcrs, sizeof(struct event_wrapper *));
if (tcs_event_log->lists == NULL) {
LogError("malloc of %zd bytes failed.",
tpm_metrics.num_pcrs * sizeof(struct event_wrapper *));
free(tcs_event_log);
return TCSERR(TSS_E_OUTOFMEMORY);
}
/* assign external event log sources here */
//tcs_event_log->firmware_source = EVLOG_IMA_SOURCE;
tcs_event_log->firmware_source = EVLOG_BIOS_SOURCE;
tcs_event_log->kernel_source = EVLOG_IMA_SOURCE;
return TSS_SUCCESS;
}
TSS_RESULT
event_log_final()
{
struct event_wrapper *cur, *next;
UINT32 i;
MUTEX_LOCK(tcs_event_log->lock);
for (i = 0; i < tpm_metrics.num_pcrs; i++) {
cur = tcs_event_log->lists[i];
while (cur != NULL) {
next = cur->next;
free(cur->event.rgbPcrValue);
free(cur->event.rgbEvent);
free(cur);
cur = next;
}
}
MUTEX_UNLOCK(tcs_event_log->lock);
free(tcs_event_log->lists);
free(tcs_event_log);
return TSS_SUCCESS;
}
TSS_RESULT
copy_pcr_event(TSS_PCR_EVENT *dest, TSS_PCR_EVENT *source)
{
memcpy(dest, source, sizeof(TSS_PCR_EVENT));
return TSS_SUCCESS;
}
TSS_RESULT
event_log_add(TSS_PCR_EVENT *event, UINT32 *pNumber)
{
struct event_wrapper *new, *tmp;
TSS_RESULT result;
UINT32 i;
MUTEX_LOCK(tcs_event_log->lock);
new = calloc(1, sizeof(struct event_wrapper));
if (new == NULL) {
LogError("malloc of %zd bytes failed.", sizeof(struct event_wrapper));
MUTEX_UNLOCK(tcs_event_log->lock);
return TCSERR(TSS_E_OUTOFMEMORY);
}
if ((result = copy_pcr_event(&(new->event), event))) {
free(new);
MUTEX_UNLOCK(tcs_event_log->lock);
return result;
}
/* go to the end of the list to add the element, so that they're in order */
i = 0;
if (tcs_event_log->lists[event->ulPcrIndex] == NULL) {
tcs_event_log->lists[event->ulPcrIndex] = new;
} else {
i++;
tmp = tcs_event_log->lists[event->ulPcrIndex];
while (tmp->next != NULL) {
i++;
tmp = tmp->next;
}
tmp->next = new;
}
*pNumber = ++i;
MUTEX_UNLOCK(tcs_event_log->lock);
return TSS_SUCCESS;
}
TSS_PCR_EVENT *
get_pcr_event(UINT32 pcrIndex, UINT32 eventNumber)
{
struct event_wrapper *tmp;
UINT32 counter = 0;
MUTEX_LOCK(tcs_event_log->lock);
tmp = tcs_event_log->lists[pcrIndex];
for (; tmp; tmp = tmp->next) {
if (counter == eventNumber) {
break;
}
counter++;
}
MUTEX_UNLOCK(tcs_event_log->lock);
return (tmp ? &(tmp->event) : NULL);
}
/* the lock should be held before calling this function */
UINT32
get_num_events(UINT32 pcrIndex)
{
struct event_wrapper *tmp;
UINT32 counter = 0;
tmp = tcs_event_log->lists[pcrIndex];
for (; tmp; tmp = tmp->next) {
counter++;
}
return counter;
}
TSS_PCR_EVENT *
concat_pcr_events(TSS_PCR_EVENT **list_so_far, UINT32 list_size, TSS_PCR_EVENT *addition,
UINT32 addition_size)
{
TSS_PCR_EVENT *ret;
ret = realloc(*list_so_far, (list_size + addition_size) * sizeof(TSS_PCR_EVENT));
if (ret == NULL) {
LogError("malloc of %zd bytes failed",
(list_size + addition_size) * sizeof(TSS_PCR_EVENT));
return ret;
}
memcpy(&ret[list_size], addition, addition_size * sizeof(TSS_PCR_EVENT));
return ret;
}
/* XXX make this a macro */
UINT32
get_pcr_event_size(TSS_PCR_EVENT *e)
{
return (sizeof(TSS_PCR_EVENT) + e->ulEventLength + e->ulPcrValueLength);
}
void
free_external_events(UINT32 eventCount, TSS_PCR_EVENT *ppEvents)
{
UINT32 j;
if (!ppEvents)
return;
for (j = 0; j < eventCount; j++) {
/* This is a fairly heinous hack, but PCR event logs can get really large
* and without it, there is a real potential to exhaust memory by leaks.
* The PCR event logs that we pull out of securityfs have had their
* rgbPcrValue and rgbEvent pointers malloc'd dynamically as the
* securityfs log was parsed. The other event log lists that are
* maintained by the TCSD don't need to have this data free'd, since that
* will happen at shutdown time only. So, for each PCR index that's
* read from securityfs, we need to free its pointers after that data has
* been set in the packet to send back to the TSP. */
if ((tcsd_options.kernel_pcrs & (1 << ppEvents[j].ulPcrIndex)) ||
(tcsd_options.firmware_pcrs & (1 << ppEvents[j].ulPcrIndex))) {
free(ppEvents[j].rgbPcrValue);
free(ppEvents[j].rgbEvent);
}
}
}
|
