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[linux.git] / security / integrity / ima / ima_init.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005,2006,2007,2008 IBM Corporation
4  *
5  * Authors:
6  * Reiner Sailer      <[email protected]>
7  * Leendert van Doorn <[email protected]>
8  * Mimi Zohar         <[email protected]>
9  *
10  * File: ima_init.c
11  *             initialization and cleanup functions
12  */
13
14 #include <linux/init.h>
15 #include <linux/scatterlist.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18
19 #include "ima.h"
20
21 /* name for boot aggregate entry */
22 static const char boot_aggregate_name[] = "boot_aggregate";
23 struct tpm_chip *ima_tpm_chip;
24
25 /* Add the boot aggregate to the IMA measurement list and extend
26  * the PCR register.
27  *
28  * Calculate the boot aggregate, a SHA1 over tpm registers 0-7,
29  * assuming a TPM chip exists, and zeroes if the TPM chip does not
30  * exist.  Add the boot aggregate measurement to the measurement
31  * list and extend the PCR register.
32  *
33  * If a tpm chip does not exist, indicate the core root of trust is
34  * not hardware based by invalidating the aggregate PCR value.
35  * (The aggregate PCR value is invalidated by adding one value to
36  * the measurement list and extending the aggregate PCR value with
37  * a different value.) Violations add a zero entry to the measurement
38  * list and extend the aggregate PCR value with ff...ff's.
39  */
40 static int __init ima_add_boot_aggregate(void)
41 {
42         static const char op[] = "add_boot_aggregate";
43         const char *audit_cause = "ENOMEM";
44         struct ima_template_entry *entry;
45         struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
46         struct ima_event_data event_data = { .iint = iint,
47                                              .filename = boot_aggregate_name };
48         int result = -ENOMEM;
49         int violation = 0;
50         struct {
51                 struct ima_digest_data hdr;
52                 char digest[TPM_DIGEST_SIZE];
53         } hash;
54
55         memset(iint, 0, sizeof(*iint));
56         memset(&hash, 0, sizeof(hash));
57         iint->ima_hash = &hash.hdr;
58         iint->ima_hash->algo = HASH_ALGO_SHA1;
59         iint->ima_hash->length = SHA1_DIGEST_SIZE;
60
61         if (ima_tpm_chip) {
62                 result = ima_calc_boot_aggregate(&hash.hdr);
63                 if (result < 0) {
64                         audit_cause = "hashing_error";
65                         goto err_out;
66                 }
67         }
68
69         result = ima_alloc_init_template(&event_data, &entry, NULL);
70         if (result < 0) {
71                 audit_cause = "alloc_entry";
72                 goto err_out;
73         }
74
75         result = ima_store_template(entry, violation, NULL,
76                                     boot_aggregate_name,
77                                     CONFIG_IMA_MEASURE_PCR_IDX);
78         if (result < 0) {
79                 ima_free_template_entry(entry);
80                 audit_cause = "store_entry";
81                 goto err_out;
82         }
83         return 0;
84 err_out:
85         integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
86                             audit_cause, result, 0);
87         return result;
88 }
89
90 #ifdef CONFIG_IMA_LOAD_X509
91 void __init ima_load_x509(void)
92 {
93         int unset_flags = ima_policy_flag & IMA_APPRAISE;
94
95         ima_policy_flag &= ~unset_flags;
96         integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
97         ima_policy_flag |= unset_flags;
98 }
99 #endif
100
101 int __init ima_init(void)
102 {
103         int rc;
104
105         ima_tpm_chip = tpm_default_chip();
106         if (!ima_tpm_chip)
107                 pr_info("No TPM chip found, activating TPM-bypass!\n");
108
109         rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
110         if (rc)
111                 return rc;
112
113         rc = ima_init_crypto();
114         if (rc)
115                 return rc;
116         rc = ima_init_template();
117         if (rc != 0)
118                 return rc;
119
120         /* It can be called before ima_init_digests(), it does not use TPM. */
121         ima_load_kexec_buffer();
122
123         rc = ima_init_digests();
124         if (rc != 0)
125                 return rc;
126         rc = ima_add_boot_aggregate();  /* boot aggregate must be first entry */
127         if (rc != 0)
128                 return rc;
129
130         ima_init_policy();
131
132         rc = ima_fs_init();
133         if (rc != 0)
134                 return rc;
135
136         ima_init_key_queue();
137
138         return rc;
139 }
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