2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Mimi Zohar <zohar@us.ibm.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 * initialization and cleanup functions
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
27 /* name for boot aggregate entry */
28 static const char *boot_aggregate_name = "boot_aggregate";
31 /* Add the boot aggregate to the IMA measurement list and extend
34 * Calculate the boot aggregate, a SHA1 over tpm registers 0-7,
35 * assuming a TPM chip exists, and zeroes if the TPM chip does not
36 * exist. Add the boot aggregate measurement to the measurement
37 * list and extend the PCR register.
39 * If a tpm chip does not exist, indicate the core root of trust is
40 * not hardware based by invalidating the aggregate PCR value.
41 * (The aggregate PCR value is invalidated by adding one value to
42 * the measurement list and extending the aggregate PCR value with
43 * a different value.) Violations add a zero entry to the measurement
44 * list and extend the aggregate PCR value with ff...ff's.
46 static int __init ima_add_boot_aggregate(void)
48 static const char op[] = "add_boot_aggregate";
49 const char *audit_cause = "ENOMEM";
50 struct ima_template_entry *entry;
51 struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
52 struct ima_event_data event_data = {iint, NULL, boot_aggregate_name,
57 struct ima_digest_data hdr;
58 char digest[TPM_DIGEST_SIZE];
61 memset(iint, 0, sizeof(*iint));
62 memset(&hash, 0, sizeof(hash));
63 iint->ima_hash = &hash.hdr;
64 iint->ima_hash->algo = HASH_ALGO_SHA1;
65 iint->ima_hash->length = SHA1_DIGEST_SIZE;
68 result = ima_calc_boot_aggregate(&hash.hdr);
70 audit_cause = "hashing_error";
75 result = ima_alloc_init_template(&event_data, &entry);
77 audit_cause = "alloc_entry";
81 result = ima_store_template(entry, violation, NULL,
83 CONFIG_IMA_MEASURE_PCR_IDX);
85 ima_free_template_entry(entry);
86 audit_cause = "store_entry";
91 integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
92 audit_cause, result, 0);
96 #ifdef CONFIG_IMA_LOAD_X509
97 void __init ima_load_x509(void)
99 int unset_flags = ima_policy_flag & IMA_APPRAISE;
101 ima_policy_flag &= ~unset_flags;
102 integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
103 ima_policy_flag |= unset_flags;
107 int __init ima_init(void)
109 u8 pcr_i[TPM_DIGEST_SIZE];
113 rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i);
118 pr_info("No TPM chip found, activating TPM-bypass!\n");
120 rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
124 rc = ima_init_crypto();
127 rc = ima_init_template();
131 rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */
137 return ima_fs_init();