Commit | Line | Data |
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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3323eec9 MZ |
2 | /* |
3 | * Copyright (C) 2005,2006,2007,2008 IBM Corporation | |
4 | * | |
5 | * Authors: | |
6 | * Reiner Sailer <sailer@watson.ibm.com> | |
7 | * Leendert van Doorn <leendert@watson.ibm.com> | |
8 | * Mimi Zohar <zohar@us.ibm.com> | |
9 | * | |
3323eec9 MZ |
10 | * File: ima_init.c |
11 | * initialization and cleanup functions | |
12 | */ | |
20ee451f JP |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
876979c9 | 16 | #include <linux/init.h> |
3323eec9 | 17 | #include <linux/scatterlist.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
3323eec9 | 19 | #include <linux/err.h> |
1525b06d | 20 | |
3323eec9 MZ |
21 | #include "ima.h" |
22 | ||
23 | /* name for boot aggregate entry */ | |
b2724d58 | 24 | static const char boot_aggregate_name[] = "boot_aggregate"; |
5c2a640a | 25 | struct tpm_chip *ima_tpm_chip; |
3323eec9 MZ |
26 | |
27 | /* Add the boot aggregate to the IMA measurement list and extend | |
28 | * the PCR register. | |
29 | * | |
30 | * Calculate the boot aggregate, a SHA1 over tpm registers 0-7, | |
31 | * assuming a TPM chip exists, and zeroes if the TPM chip does not | |
32 | * exist. Add the boot aggregate measurement to the measurement | |
33 | * list and extend the PCR register. | |
34 | * | |
35 | * If a tpm chip does not exist, indicate the core root of trust is | |
36 | * not hardware based by invalidating the aggregate PCR value. | |
37 | * (The aggregate PCR value is invalidated by adding one value to | |
38 | * the measurement list and extending the aggregate PCR value with | |
39 | * a different value.) Violations add a zero entry to the measurement | |
40 | * list and extend the aggregate PCR value with ff...ff's. | |
41 | */ | |
be39ffc2 | 42 | static int __init ima_add_boot_aggregate(void) |
3323eec9 | 43 | { |
52a13284 MZ |
44 | static const char op[] = "add_boot_aggregate"; |
45 | const char *audit_cause = "ENOMEM"; | |
3323eec9 | 46 | struct ima_template_entry *entry; |
7bc5f447 | 47 | struct integrity_iint_cache tmp_iint, *iint = &tmp_iint; |
23b57419 | 48 | struct ima_event_data event_data = {iint, NULL, boot_aggregate_name, |
8d94eb9b | 49 | NULL, 0, NULL}; |
3323eec9 | 50 | int result = -ENOMEM; |
7bc5f447 | 51 | int violation = 0; |
09ef5435 DK |
52 | struct { |
53 | struct ima_digest_data hdr; | |
54 | char digest[TPM_DIGEST_SIZE]; | |
55 | } hash; | |
3323eec9 | 56 | |
7bc5f447 RS |
57 | memset(iint, 0, sizeof(*iint)); |
58 | memset(&hash, 0, sizeof(hash)); | |
59 | iint->ima_hash = &hash.hdr; | |
60 | iint->ima_hash->algo = HASH_ALGO_SHA1; | |
61 | iint->ima_hash->length = SHA1_DIGEST_SIZE; | |
3323eec9 | 62 | |
ec403d8e | 63 | if (ima_tpm_chip) { |
09ef5435 | 64 | result = ima_calc_boot_aggregate(&hash.hdr); |
3323eec9 MZ |
65 | if (result < 0) { |
66 | audit_cause = "hashing_error"; | |
3323eec9 MZ |
67 | goto err_out; |
68 | } | |
69 | } | |
7bc5f447 | 70 | |
23b57419 | 71 | result = ima_alloc_init_template(&event_data, &entry); |
be39ffc2 RS |
72 | if (result < 0) { |
73 | audit_cause = "alloc_entry"; | |
74 | goto err_out; | |
75 | } | |
7bc5f447 | 76 | |
9803d413 | 77 | result = ima_store_template(entry, violation, NULL, |
14b1da85 ER |
78 | boot_aggregate_name, |
79 | CONFIG_IMA_MEASURE_PCR_IDX); | |
be39ffc2 | 80 | if (result < 0) { |
a7ed7c60 | 81 | ima_free_template_entry(entry); |
be39ffc2 RS |
82 | audit_cause = "store_entry"; |
83 | goto err_out; | |
84 | } | |
85 | return 0; | |
3323eec9 MZ |
86 | err_out: |
87 | integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op, | |
88 | audit_cause, result, 0); | |
be39ffc2 | 89 | return result; |
3323eec9 MZ |
90 | } |
91 | ||
fd5f4e90 DK |
92 | #ifdef CONFIG_IMA_LOAD_X509 |
93 | void __init ima_load_x509(void) | |
94 | { | |
95 | int unset_flags = ima_policy_flag & IMA_APPRAISE; | |
96 | ||
97 | ima_policy_flag &= ~unset_flags; | |
a18d0cbf | 98 | integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH); |
fd5f4e90 DK |
99 | ima_policy_flag |= unset_flags; |
100 | } | |
101 | #endif | |
102 | ||
932995f0 | 103 | int __init ima_init(void) |
3323eec9 | 104 | { |
3323eec9 MZ |
105 | int rc; |
106 | ||
5c2a640a | 107 | ima_tpm_chip = tpm_default_chip(); |
ec403d8e | 108 | if (!ima_tpm_chip) |
5c2a640a | 109 | pr_info("No TPM chip found, activating TPM-bypass!\n"); |
3323eec9 | 110 | |
f4dc3778 | 111 | rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA); |
31b70f66 DK |
112 | if (rc) |
113 | return rc; | |
114 | ||
76bb28f6 DK |
115 | rc = ima_init_crypto(); |
116 | if (rc) | |
117 | return rc; | |
adf53a77 RS |
118 | rc = ima_init_template(); |
119 | if (rc != 0) | |
120 | return rc; | |
121 | ||
0b6cf6b9 | 122 | /* It can be called before ima_init_digests(), it does not use TPM. */ |
94c3aac5 MZ |
123 | ima_load_kexec_buffer(); |
124 | ||
0b6cf6b9 RS |
125 | rc = ima_init_digests(); |
126 | if (rc != 0) | |
127 | return rc; | |
be39ffc2 RS |
128 | rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */ |
129 | if (rc != 0) | |
130 | return rc; | |
131 | ||
3323eec9 | 132 | ima_init_policy(); |
bab73937 MZ |
133 | |
134 | return ima_fs_init(); | |
135 | } |