diff options
Diffstat (limited to 'firmware/lib/tpm_bootmode.c')
| -rw-r--r-- | firmware/lib/tpm_bootmode.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/firmware/lib/tpm_bootmode.c b/firmware/lib/tpm_bootmode.c deleted file mode 100644 index cae4b0b1..00000000 --- a/firmware/lib/tpm_bootmode.c +++ /dev/null @@ -1,169 +0,0 @@ -/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - * - * Functions for updating the TPM state with the status of boot path. - */ - -#include "sysincludes.h" - -#include "tlcl.h" -#include "tpm_bootmode.h" -#include "utility.h" -#include "vboot_api.h" - -/* TPM PCRs to use for storing boot mode measurements. */ -#define BOOT_MODE_PCR 0 -#define HWID_DIGEST_PCR 1 - -/* - * Input digests for PCR extend. - * These are calculated as: - * SHA1("|Developer_Mode||Recovery_Mode||Keyblock_Mode|"). - * Developer_Mode can be 0 or 1. - * Recovery_Mode can be 0 or 1. - * Keyblock flags are defined in vboot_struct.h - * - * We map them to Keyblock_Mode as follows: - * ----------------------------------------- - * Keyblock Flags | Keyblock Mode - * ----------------------------------------- - * 6 (Dev-signed firmware) | 2 - * 7 Normal-signed firmware | 1 - * (anything else) | 0 - */ - -const char* kBootStateSHA1Digests[] = { - /* SHA1("\x00\x00\x00") */ - "\x29\xe2\xdc\xfb\xb1\x6f\x63\xbb\x02\x54\xdf\x75\x85\xa1\x5b\xb6" - "\xfb\x5e\x92\x7d", - - /* SHA1("\x00\x00\x01") */ - "\x25\x47\xcc\x73\x6e\x95\x1f\xa4\x91\x98\x53\xc4\x3a\xe8\x90\x86" - "\x1a\x3b\x32\x64", - - /* SHA1("\x00\x00\x02") */ - "\x1e\xf6\x24\x48\x2d\x62\x0e\x43\xe6\xd3\x4d\xa1\xaf\xe4\x62\x67" - "\xfc\x69\x5d\x9b", - - /* SHA1("\x00\x01\x00") */ - "\x62\x57\x18\x91\x21\x5b\x4e\xfc\x1c\xea\xb7\x44\xce\x59\xdd\x0b" - "\x66\xea\x6f\x73", - - /* SHA1("\x00\x01\x01") */ - "\xee\xe4\x47\xed\xc7\x9f\xea\x1c\xa7\xc7\xd3\x4e\x46\x32\x61\xcd" - "\xa4\xba\x33\x9e", - - /* SHA1("\x00\x01\x02") */ - "\x0c\x7a\x62\x3f\xd2\xbb\xc0\x5b\x06\x42\x3b\xe3\x59\xe4\x02\x1d" - "\x36\xe7\x21\xad", - - /* SHA1("\x01\x00\x00") */ - "\x95\x08\xe9\x05\x48\xb0\x44\x0a\x4a\x61\xe5\x74\x3b\x76\xc1\xe3" - "\x09\xb2\x3b\x7f", - - /* SHA1("\x01\x00\x01") */ - "\xc4\x2a\xc1\xc4\x6f\x1d\x4e\x21\x1c\x73\x5c\xc7\xdf\xad\x4f\xf8" - "\x39\x11\x10\xe9", - - /* SHA1("\x01\x00\x02") */ - "\xfa\x01\x0d\x26\x64\xcc\x5b\x3b\x82\xee\x48\x8f\xe2\xb9\xf5\x0f" - "\x49\x32\xeb\x8f", - - /* SHA1("\x01\x01\x00") */ - "\x47\xec\x8d\x98\x36\x64\x33\xdc\x00\x2e\x77\x21\xc9\xe3\x7d\x50" - "\x67\x54\x79\x37", - - /* SHA1("\x01\x01\x01") */ - "\x28\xd8\x6c\x56\xb3\xbf\x26\xd2\x36\x56\x9b\x8d\xc8\xc3\xf9\x1f" - "\x32\xf4\x7b\xc7", - - /* SHA1("\x01\x01\x02") */ - "\x12\xa3\x40\xd7\x89\x7f\xe7\x13\xfc\x8f\x02\xac\x53\x65\xb8\x6e" - "\xbf\x35\x31\x78", -}; - -#define MAX_BOOT_STATE_INDEX (sizeof(kBootStateSHA1Digests)/sizeof(char *)) - -/* - * Used for PCR extend when the passed-in boot state is invalid or if there is - * an internal error. - */ -const uint8_t kBootInvalidSHA1Digest[] = { - "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" - "\xff\xff\xff\xff" -}; - -/** - * Given the boot state, return the correct SHA1 digest index for TPMExtend - * in kBootStateSHA1Digests[]. - */ -static int GetBootStateIndex(int dev_mode, int rec_mode, - uint64_t keyblock_flags) -{ - int index = 0; - - /* - * Convert keyblock flags into keyblock mode which we use to index into - * kBootStateSHA1Digest[]. - */ - switch(keyblock_flags) { - case 6: - /* - * KEY_BLOCK_FLAG_RECOVERY_0 | KEY_BLOCK_FLAG_DEVELOPER_1 - * - * Developer firmware. */ - index = 2; - break; - case 7: - /* - * KEY_BLOCK_FLAG_RECOVERY_0 | KEY_BLOCK_FLAG_DEVELOPER_0 - * | KEY_BLOCK_FLAGS_DEVELOPER_1 - */ - index = 1; - break; - default: - /* Any other keyblock flags. */ - index = 0; - }; - - if (rec_mode) - index += 3; - if (dev_mode) - index += 6; - return index; -} - -uint32_t SetTPMBootModeState(int developer_mode, int recovery_mode, - uint64_t fw_keyblock_flags, - GoogleBinaryBlockHeader *gbb) -{ - uint32_t result0, result1 = 0; - const uint8_t *in_digest = NULL; - uint8_t out_digest[20]; /* For PCR extend output. */ - int digest_index = GetBootStateIndex(developer_mode, recovery_mode, - fw_keyblock_flags); - - if (digest_index >= 0 && digest_index < MAX_BOOT_STATE_INDEX) { - in_digest = (const uint8_t*) - kBootStateSHA1Digests[digest_index]; - } else { - /* Internal out of bounds error. */ - in_digest = kBootInvalidSHA1Digest; - } - - result0 = TlclExtend(BOOT_MODE_PCR, in_digest, out_digest); - VBDEBUG(("TPM: SetTPMBootModeState boot mode PCR%d result %d\n", - BOOT_MODE_PCR, result0)); - - /* Extend the HWID Digest into PCR1 (GBB v1.2 and later only) */ - if (gbb && gbb->minor_version >= 2) { - result1 = TlclExtend(HWID_DIGEST_PCR, gbb->hwid_digest, - out_digest); - VBDEBUG(("TPM: SetTPMBootModeState HWID PCR%d result %d\n", - HWID_DIGEST_PCR, result1)); - } - - /* The caller only looks for nonzero results, not error codes. */ - return result0 || result1; -} |