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3323eec9 MZ |
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 | */ | |
20ee451f JP |
17 | |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
19 | ||
3323eec9 MZ |
20 | #include <linux/module.h> |
21 | #include <linux/scatterlist.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
3323eec9 | 23 | #include <linux/err.h> |
1525b06d | 24 | |
3323eec9 MZ |
25 | #include "ima.h" |
26 | ||
27 | /* name for boot aggregate entry */ | |
523979ad | 28 | static const char *boot_aggregate_name = "boot_aggregate"; |
3323eec9 MZ |
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 | */ | |
be39ffc2 | 46 | static int __init ima_add_boot_aggregate(void) |
3323eec9 | 47 | { |
52a13284 MZ |
48 | static const char op[] = "add_boot_aggregate"; |
49 | const char *audit_cause = "ENOMEM"; | |
3323eec9 | 50 | struct ima_template_entry *entry; |
7bc5f447 | 51 | struct integrity_iint_cache tmp_iint, *iint = &tmp_iint; |
23b57419 | 52 | struct ima_event_data event_data = {iint, NULL, boot_aggregate_name, |
8d94eb9b | 53 | NULL, 0, NULL}; |
3323eec9 | 54 | int result = -ENOMEM; |
7bc5f447 | 55 | int violation = 0; |
09ef5435 DK |
56 | struct { |
57 | struct ima_digest_data hdr; | |
58 | char digest[TPM_DIGEST_SIZE]; | |
59 | } hash; | |
3323eec9 | 60 | |
7bc5f447 RS |
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; | |
3323eec9 | 66 | |
3323eec9 | 67 | if (ima_used_chip) { |
09ef5435 | 68 | result = ima_calc_boot_aggregate(&hash.hdr); |
3323eec9 MZ |
69 | if (result < 0) { |
70 | audit_cause = "hashing_error"; | |
3323eec9 MZ |
71 | goto err_out; |
72 | } | |
73 | } | |
7bc5f447 | 74 | |
23b57419 | 75 | result = ima_alloc_init_template(&event_data, &entry); |
be39ffc2 RS |
76 | if (result < 0) { |
77 | audit_cause = "alloc_entry"; | |
78 | goto err_out; | |
79 | } | |
7bc5f447 | 80 | |
9803d413 | 81 | result = ima_store_template(entry, violation, NULL, |
14b1da85 ER |
82 | boot_aggregate_name, |
83 | CONFIG_IMA_MEASURE_PCR_IDX); | |
be39ffc2 | 84 | if (result < 0) { |
a7ed7c60 | 85 | ima_free_template_entry(entry); |
be39ffc2 RS |
86 | audit_cause = "store_entry"; |
87 | goto err_out; | |
88 | } | |
89 | return 0; | |
3323eec9 MZ |
90 | err_out: |
91 | integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op, | |
92 | audit_cause, result, 0); | |
be39ffc2 | 93 | return result; |
3323eec9 MZ |
94 | } |
95 | ||
fd5f4e90 DK |
96 | #ifdef CONFIG_IMA_LOAD_X509 |
97 | void __init ima_load_x509(void) | |
98 | { | |
99 | int unset_flags = ima_policy_flag & IMA_APPRAISE; | |
100 | ||
101 | ima_policy_flag &= ~unset_flags; | |
a18d0cbf | 102 | integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH); |
fd5f4e90 DK |
103 | ima_policy_flag |= unset_flags; |
104 | } | |
105 | #endif | |
106 | ||
932995f0 | 107 | int __init ima_init(void) |
3323eec9 | 108 | { |
140d8022 | 109 | u8 pcr_i[TPM_DIGEST_SIZE]; |
3323eec9 MZ |
110 | int rc; |
111 | ||
112 | ima_used_chip = 0; | |
113 | rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i); | |
114 | if (rc == 0) | |
115 | ima_used_chip = 1; | |
116 | ||
117 | if (!ima_used_chip) | |
20ee451f | 118 | pr_info("No TPM chip found, activating TPM-bypass!\n"); |
3323eec9 | 119 | |
f4dc3778 | 120 | rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA); |
31b70f66 DK |
121 | if (rc) |
122 | return rc; | |
123 | ||
76bb28f6 DK |
124 | rc = ima_init_crypto(); |
125 | if (rc) | |
126 | return rc; | |
adf53a77 RS |
127 | rc = ima_init_template(); |
128 | if (rc != 0) | |
129 | return rc; | |
130 | ||
be39ffc2 RS |
131 | rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */ |
132 | if (rc != 0) | |
133 | return rc; | |
134 | ||
3323eec9 | 135 | ima_init_policy(); |
bab73937 MZ |
136 | |
137 | return ima_fs_init(); | |
138 | } |