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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 | #include <linux/module.h> | |
18 | #include <linux/scatterlist.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3323eec9 MZ |
20 | #include <linux/err.h> |
21 | #include "ima.h" | |
22 | ||
23 | /* name for boot aggregate entry */ | |
523979ad | 24 | static const char *boot_aggregate_name = "boot_aggregate"; |
3323eec9 MZ |
25 | int ima_used_chip; |
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 | */ | |
932995f0 | 42 | static void __init ima_add_boot_aggregate(void) |
3323eec9 MZ |
43 | { |
44 | struct ima_template_entry *entry; | |
45 | const char *op = "add_boot_aggregate"; | |
46 | const char *audit_cause = "ENOMEM"; | |
47 | int result = -ENOMEM; | |
48 | int violation = 1; | |
49 | ||
50 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
51 | if (!entry) | |
52 | goto err_out; | |
53 | ||
54 | memset(&entry->template, 0, sizeof(entry->template)); | |
55 | strncpy(entry->template.file_name, boot_aggregate_name, | |
56 | IMA_EVENT_NAME_LEN_MAX); | |
57 | if (ima_used_chip) { | |
58 | violation = 0; | |
59 | result = ima_calc_boot_aggregate(entry->template.digest); | |
60 | if (result < 0) { | |
61 | audit_cause = "hashing_error"; | |
62 | kfree(entry); | |
63 | goto err_out; | |
64 | } | |
65 | } | |
66 | result = ima_store_template(entry, violation, NULL); | |
67 | if (result < 0) | |
68 | kfree(entry); | |
69 | return; | |
70 | err_out: | |
71 | integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op, | |
72 | audit_cause, result, 0); | |
73 | } | |
74 | ||
932995f0 | 75 | int __init ima_init(void) |
3323eec9 MZ |
76 | { |
77 | u8 pcr_i[IMA_DIGEST_SIZE]; | |
78 | int rc; | |
79 | ||
80 | ima_used_chip = 0; | |
81 | rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i); | |
82 | if (rc == 0) | |
83 | ima_used_chip = 1; | |
84 | ||
85 | if (!ima_used_chip) | |
eb8dae96 | 86 | pr_info("IMA: No TPM chip found, activating TPM-bypass!\n"); |
3323eec9 MZ |
87 | |
88 | ima_add_boot_aggregate(); /* boot aggregate must be first entry */ | |
89 | ima_init_policy(); | |
bab73937 MZ |
90 | |
91 | return ima_fs_init(); | |
92 | } | |
93 | ||
94 | void __exit ima_cleanup(void) | |
95 | { | |
96 | ima_fs_cleanup(); | |
3323eec9 | 97 | } |