Merge remote-tracking branches 'regulator/topic/can-change', 'regulator/topic/constra...
[deliverable/linux.git] / security / integrity / ima / ima_init.c
1 /*
2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
3 *
4 * Authors:
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Mimi Zohar <zohar@us.ibm.com>
8 *
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
12 * License.
13 *
14 * File: ima_init.c
15 * initialization and cleanup functions
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24
25 #include "ima.h"
26
27 /* name for boot aggregate entry */
28 static const char *boot_aggregate_name = "boot_aggregate";
29 int ima_used_chip;
30
31 /* Add the boot aggregate to the IMA measurement list and extend
32 * the PCR register.
33 *
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.
38 *
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.
45 */
46 static int __init ima_add_boot_aggregate(void)
47 {
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,
53 NULL, 0, NULL};
54 int result = -ENOMEM;
55 int violation = 0;
56 struct {
57 struct ima_digest_data hdr;
58 char digest[TPM_DIGEST_SIZE];
59 } hash;
60
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;
66
67 if (ima_used_chip) {
68 result = ima_calc_boot_aggregate(&hash.hdr);
69 if (result < 0) {
70 audit_cause = "hashing_error";
71 goto err_out;
72 }
73 }
74
75 result = ima_alloc_init_template(&event_data, &entry);
76 if (result < 0) {
77 audit_cause = "alloc_entry";
78 goto err_out;
79 }
80
81 result = ima_store_template(entry, violation, NULL,
82 boot_aggregate_name);
83 if (result < 0) {
84 ima_free_template_entry(entry);
85 audit_cause = "store_entry";
86 goto err_out;
87 }
88 return 0;
89 err_out:
90 integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
91 audit_cause, result, 0);
92 return result;
93 }
94
95 #ifdef CONFIG_IMA_LOAD_X509
96 void __init ima_load_x509(void)
97 {
98 int unset_flags = ima_policy_flag & IMA_APPRAISE;
99
100 ima_policy_flag &= ~unset_flags;
101 integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
102 ima_policy_flag |= unset_flags;
103 }
104 #endif
105
106 int __init ima_init(void)
107 {
108 u8 pcr_i[TPM_DIGEST_SIZE];
109 int rc;
110
111 ima_used_chip = 0;
112 rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i);
113 if (rc == 0)
114 ima_used_chip = 1;
115
116 if (!ima_used_chip)
117 pr_info("No TPM chip found, activating TPM-bypass!\n");
118
119 rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
120 if (rc)
121 return rc;
122
123 rc = ima_init_crypto();
124 if (rc)
125 return rc;
126 rc = ima_init_template();
127 if (rc != 0)
128 return rc;
129
130 rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */
131 if (rc != 0)
132 return rc;
133
134 ima_init_policy();
135
136 return ima_fs_init();
137 }
This page took 0.034434 seconds and 6 git commands to generate.