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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Facebook Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <console/console.h>
#include <fmap.h>
#include <cbfs.h>
#include <security/vboot/vboot_crtm.h>
#include <security/vboot/misc.h>
#include <string.h>
/*
* This functions sets the TCPA log namespace
* for the cbfs file (region) lookup.
*/
static int create_tcpa_metadata(const struct region_device *rdev,
const char *cbfs_name, char log_string[TCPA_PCR_HASH_NAME])
{
int i;
struct region_device fmap;
const static char *fmap_cbfs_names[] = {
"COREBOOT",
"FW_MAIN_A",
"FW_MAIN_B",
"RW_LEGACY"};
for (i = 0; i < ARRAY_SIZE(fmap_cbfs_names); i++) {
if (fmap_locate_area_as_rdev(fmap_cbfs_names[i], &fmap) == 0) {
if (region_is_subregion(region_device_region(&fmap),
region_device_region(rdev))) {
snprintf(log_string, TCPA_PCR_HASH_NAME,
"FMAP: %s CBFS: %s",
fmap_cbfs_names[i], cbfs_name);
return 0;
}
}
}
return -1;
}
uint32_t vboot_init_crtm(void)
{
struct prog bootblock = PROG_INIT(PROG_BOOTBLOCK, "bootblock");
struct prog verstage =
PROG_INIT(PROG_VERSTAGE, CONFIG_CBFS_PREFIX "/verstage");
struct prog romstage =
PROG_INIT(PROG_ROMSTAGE, CONFIG_CBFS_PREFIX "/romstage");
char tcpa_metadata[TCPA_PCR_HASH_NAME];
/* Initialize TCPE PRERAM log. */
tcpa_preram_log_clear();
/* measure bootblock from RO */
struct cbfsf bootblock_data;
struct region_device bootblock_fmap;
if (fmap_locate_area_as_rdev("BOOTBLOCK", &bootblock_fmap) == 0) {
if (tpm_measure_region(&bootblock_fmap,
TPM_CRTM_PCR,
"FMAP: BOOTBLOCK"))
return VB2_ERROR_UNKNOWN;
} else {
if (cbfs_boot_locate(&bootblock_data,
prog_name(&bootblock), NULL) == 0) {
cbfs_file_data(prog_rdev(&bootblock), &bootblock_data);
if (create_tcpa_metadata(prog_rdev(&bootblock),
prog_name(&bootblock), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&bootblock),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure bootblock into CRTM!\n");
return VB2_ERROR_UNKNOWN;
}
}
if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE)) {
struct cbfsf romstage_data;
/* measure romstage from RO */
if (cbfs_boot_locate(&romstage_data,
prog_name(&romstage), NULL) == 0) {
cbfs_file_data(prog_rdev(&romstage), &romstage_data);
if (create_tcpa_metadata(prog_rdev(&romstage),
prog_name(&romstage), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&romstage),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure %s into CRTM!\n",
CONFIG_CBFS_PREFIX "/romstage");
return VB2_ERROR_UNKNOWN;
}
}
if (CONFIG(VBOOT_SEPARATE_VERSTAGE)) {
struct cbfsf verstage_data;
/* measure verstage from RO */
if (cbfs_boot_locate(&verstage_data,
prog_name(&verstage), NULL) == 0) {
cbfs_file_data(prog_rdev(&verstage), &verstage_data);
if (create_tcpa_metadata(prog_rdev(&verstage),
prog_name(&verstage), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&verstage),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure %s into CRTM!\n",
CONFIG_CBFS_PREFIX "/verstage");
return VB2_ERROR_UNKNOWN;
}
}
return VB2_SUCCESS;
}
static bool is_runtime_data(const char *name)
{
const char *whitelist = CONFIG_VBOOT_MEASURED_BOOT_RUNTIME_DATA;
size_t whitelist_len = sizeof(CONFIG_VBOOT_MEASURED_BOOT_RUNTIME_DATA) - 1;
size_t name_len = strlen(name);
int i;
if (!whitelist_len || !name_len)
return false;
for (i = 0; (i + name_len) <= whitelist_len; i++) {
if (!strcmp(whitelist + i, name))
return true;
}
return false;
}
uint32_t vboot_measure_cbfs_hook(struct cbfsf *fh, const char *name)
{
uint32_t pcr_index;
uint32_t cbfs_type;
struct region_device rdev;
char tcpa_metadata[TCPA_PCR_HASH_NAME];
if (!vboot_logic_executed())
return 0;
cbfsf_file_type(fh, &cbfs_type);
cbfs_file_data(&rdev, fh);
switch (cbfs_type) {
case CBFS_TYPE_MRC:
case CBFS_TYPE_MRC_CACHE:
pcr_index = TPM_RUNTIME_DATA_PCR;
break;
case CBFS_TYPE_STAGE:
case CBFS_TYPE_SELF:
case CBFS_TYPE_FIT:
pcr_index = TPM_CRTM_PCR;
break;
default:
if (is_runtime_data(name))
pcr_index = TPM_RUNTIME_DATA_PCR;
else
pcr_index = TPM_CRTM_PCR;
break;
}
if (create_tcpa_metadata(&rdev, name, tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
return tpm_measure_region(&rdev, pcr_index, tcpa_metadata);
}
|
