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e49e8af65f
Third time's the charm. Now that we've moved to u-boot-next, this won't break the ARM build. BUG=chromium-os:17006 TEST=make && make runtests; emerge vboot_reference; emerge-tegra2_seaboard chromeos-bootimage Change-Id: Ib4fa26c7a23868dd2ffd2b321ee8dc08c66ea322 Original-Change-Id: I771085dcdf79d9592de64f35e3b758111a80dd9f Original-Reviewed-on: http://gerrit.chromium.org/gerrit/3263 Original-Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-on: http://gerrit.chromium.org/gerrit/3803 Tested-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org>
136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Functions for updating the TPM state with the status of boot path.
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*/
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#include "tpm_bootmode.h"
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#include "tlcl.h"
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#include "utility.h"
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#include "vboot_api.h"
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/* TPM PCR to use for storing boot mode measurements. */
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#define BOOT_MODE_PCR 0
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/* Input digests for PCR extend.
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* These are calculated as:
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* SHA1("|Developer_Mode||Recovery_Mode||Keyblock_Mode|").
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* Developer_Mode can be 0 or 1.
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* Recovery_Mode can be 0 or 1.
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* Keyblock flags are defined in vboot_struct.h
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*
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* We map them to Keyblock_Mode as follows:
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* -----------------------------------------
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* Keyblock Flags | Keyblock Mode
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* -----------------------------------------
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* 6 (Dev-signed firmware) | 2
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* 7 Normal-signed firmware | 1
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* (anything else) | 0
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*/
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const char* kBootStateSHA1Digests[] = {
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/* SHA1("\x00\x00\x00") */
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"\x29\xe2\xdc\xfb\xb1\x6f\x63\xbb\x02\x54\xdf\x75\x85\xa1\x5b\xb6"
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"\xfb\x5e\x92\x7d",
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/* SHA1("\x00\x00\x01") */
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"\x25\x47\xcc\x73\x6e\x95\x1f\xa4\x91\x98\x53\xc4\x3a\xe8\x90\x86"
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"\x1a\x3b\x32\x64",
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/* SHA1("\x00\x00\x02") */
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"\x1e\xf6\x24\x48\x2d\x62\x0e\x43\xe6\xd3\x4d\xa1\xaf\xe4\x62\x67"
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"\xfc\x69\x5d\x9b",
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/* SHA1("\x00\x01\x00") */
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"\x62\x57\x18\x91\x21\x5b\x4e\xfc\x1c\xea\xb7\x44\xce\x59\xdd\x0b"
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"\x66\xea\x6f\x73",
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/* SHA1("\x00\x01\x01") */
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"\xee\xe4\x47\xed\xc7\x9f\xea\x1c\xa7\xc7\xd3\x4e\x46\x32\x61\xcd"
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"\xa4\xba\x33\x9e",
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/* SHA1("\x00\x01\x02") */
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"\x0c\x7a\x62\x3f\xd2\xbb\xc0\x5b\x06\x42\x3b\xe3\x59\xe4\x02\x1d"
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"\x36\xe7\x21\xad",
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/* SHA1("\x01\x00\x00") */
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"\x95\x08\xe9\x05\x48\xb0\x44\x0a\x4a\x61\xe5\x74\x3b\x76\xc1\xe3"
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"\x09\xb2\x3b\x7f",
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/* SHA1("\x01\x00\x01") */
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"\xc4\x2a\xc1\xc4\x6f\x1d\x4e\x21\x1c\x73\x5c\xc7\xdf\xad\x4f\xf8"
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"\x39\x11\x10\xe9",
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/* SHA1("\x01\x00\x02") */
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"\xfa\x01\x0d\x26\x64\xcc\x5b\x3b\x82\xee\x48\x8f\xe2\xb9\xf5\x0f"
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"\x49\x32\xeb\x8f",
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/* SHA1("\x01\x01\x00") */
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"\x47\xec\x8d\x98\x36\x64\x33\xdc\x00\x2e\x77\x21\xc9\xe3\x7d\x50"
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"\x67\x54\x79\x37",
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/* SHA1("\x01\x01\x01") */
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"\x28\xd8\x6c\x56\xb3\xbf\x26\xd2\x36\x56\x9b\x8d\xc8\xc3\xf9\x1f"
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"\x32\xf4\x7b\xc7",
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/* SHA1("\x01\x01\x02") */
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"\x12\xa3\x40\xd7\x89\x7f\xe7\x13\xfc\x8f\x02\xac\x53\x65\xb8\x6e"
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"\xbf\x35\x31\x78",
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};
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#define MAX_BOOT_STATE_INDEX (sizeof(kBootStateSHA1Digests)/sizeof(char*))
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/* Used for PCR extend when the passed-in boot state is invalid or
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* if there is an internal error. */
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const uint8_t kBootInvalidSHA1Digest[] = {
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff"
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};
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/* Given the boot state, return the correct SHA1 digest index for TPMExtend
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* in kBootStateSHA1Digests[]. */
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int GetBootStateIndex(int dev_mode, int rec_mode, int keyblock_flags) {
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int index = 0;
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/* Convert keyblock flags into keyblock mode which we use to index into
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* kBootStateSHA1Digest[]. */
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switch(keyblock_flags) {
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case 6: /* KEY_BLOCK_FLAG_RECOVERY_0 | KEY_BLOCK_FLAG_DEVELOPER_1 */
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/* Developer firmware. */
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index = 2;
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break;
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case 7: /* KEY_BLOCK_FLAG_RECOVERY_0 | KEY_BLOCK_FLAG_DEVELOPER_0
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* | KEY_BLOCK_FLAGS_DEVELOPER_1 */
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index = 1;
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break;
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default:
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index = 0; /* Any other keyblock flags. */
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};
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if (rec_mode)
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index += 3;
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if (dev_mode)
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index += 6;
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return index;
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}
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uint32_t SetTPMBootModeState(int developer_mode, int recovery_mode,
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int fw_keyblock_flags) {
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uint32_t result;
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const uint8_t* in_digest = NULL;
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uint8_t out_digest[20]; /* For PCR extend output. */
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int digest_index = GetBootStateIndex(developer_mode, recovery_mode,
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fw_keyblock_flags);
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if (digest_index >= 0 && digest_index < MAX_BOOT_STATE_INDEX)
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in_digest = (const uint8_t*)kBootStateSHA1Digests[digest_index];
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else
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in_digest = kBootInvalidSHA1Digest; /* Internal out of bounds error. */
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result = TlclExtend(BOOT_MODE_PCR, in_digest, out_digest);
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VBDEBUG(("TPM: SetTPMBootModeState boot mode PCR out_digest %02x %02x %02x "
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"%02x\n", out_digest, out_digest+1, out_digest+2, out_digest+3));
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return result;
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}
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