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
|
/* SPDX-License-Identifier: BSD-3-Clause */
#include <security/tpm/tspi.h>
#include <security/tpm/tss.h>
#include <security/vboot/antirollback.h>
#include <vb2_api.h>
#include "secdata_tpm_private.h"
/**
* Similarly to safe_write(), this ensures we don't fail a DefineSpace because
* we hit the TPM write limit. This is even less likely to happen than with
* writes because we only define spaces once at initialization, but we'd
* rather be paranoid about this.
*/
static tpm_result_t safe_define_space(uint32_t index, uint32_t perm, uint32_t size)
{
tpm_result_t rc = tlcl1_define_space(index, perm, size);
if (rc == TPM_MAXNVWRITES) {
RETURN_ON_FAILURE(tpm_clear_and_reenable());
return tlcl1_define_space(index, perm, size);
} else {
return rc;
}
}
tpm_result_t factory_initialize_tpm1(struct vb2_context *ctx)
{
TPM_PERMANENT_FLAGS pflags;
tpm_result_t rc;
vb2api_secdata_firmware_create(ctx);
vb2api_secdata_kernel_create_v0(ctx);
rc = tlcl1_get_permanent_flags(&pflags);
if (rc != TPM_SUCCESS)
return rc;
/*
* TPM may come from the factory without physical presence finalized.
* Fix if necessary.
*/
VBDEBUG("TPM: physicalPresenceLifetimeLock=%d\n",
pflags.physicalPresenceLifetimeLock);
if (!pflags.physicalPresenceLifetimeLock) {
VBDEBUG("TPM: Finalizing physical presence\n");
RETURN_ON_FAILURE(tlcl_finalize_physical_presence());
}
/*
* The TPM will not enforce the NV authorization restrictions until the
* execution of a TPM_NV_DefineSpace with the handle of
* TPM_NV_INDEX_LOCK. Here we create that space if it doesn't already
* exist. */
VBDEBUG("TPM: nvLocked=%d\n", pflags.nvLocked);
if (!pflags.nvLocked) {
VBDEBUG("TPM: Enabling NV locking\n");
RETURN_ON_FAILURE(tlcl1_set_nv_locked());
}
/* Clear TPM owner, in case the TPM is already owned for some reason. */
VBDEBUG("TPM: Clearing owner\n");
RETURN_ON_FAILURE(tpm_clear_and_reenable());
/* Define and write secdata_kernel space. */
RETURN_ON_FAILURE(safe_define_space(KERNEL_NV_INDEX,
TPM_NV_PER_PPWRITE,
VB2_SECDATA_KERNEL_SIZE_V02));
RETURN_ON_FAILURE(safe_write(KERNEL_NV_INDEX,
ctx->secdata_kernel,
VB2_SECDATA_KERNEL_SIZE_V02));
/* Define and write secdata_firmware space. */
RETURN_ON_FAILURE(safe_define_space(FIRMWARE_NV_INDEX,
TPM_NV_PER_GLOBALLOCK |
TPM_NV_PER_PPWRITE,
VB2_SECDATA_FIRMWARE_SIZE));
RETURN_ON_FAILURE(safe_write(FIRMWARE_NV_INDEX,
ctx->secdata_firmware,
VB2_SECDATA_FIRMWARE_SIZE));
return TPM_SUCCESS;
}
|
