summaryrefslogtreecommitdiffstats
path: root/security/integrity/ima/ima_crypto.c
blob: e5d3ebf184366a1539a0f87976db4742022c7f4f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/*
 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
 *
 * Authors:
 * Mimi Zohar <zohar@us.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2 of the License.
 *
 * File: ima_crypto.c
 * 	Calculates md5/sha1 file hash, template hash, boot-aggreate hash
 */

#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/crypto.h>
#include <linux/scatterlist.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <crypto/hash.h>
#include <crypto/hash_info.h>
#include "ima.h"

static struct crypto_shash *ima_shash_tfm;

int ima_init_crypto(void)
{
	long rc;

	ima_shash_tfm = crypto_alloc_shash(hash_algo_name[ima_hash_algo], 0, 0);
	if (IS_ERR(ima_shash_tfm)) {
		rc = PTR_ERR(ima_shash_tfm);
		pr_err("Can not allocate %s (reason: %ld)\n",
		       hash_algo_name[ima_hash_algo], rc);
		return rc;
	}
	return 0;
}

static struct crypto_shash *ima_alloc_tfm(enum hash_algo algo)
{
	struct crypto_shash *tfm = ima_shash_tfm;
	int rc;

	if (algo != ima_hash_algo && algo < HASH_ALGO__LAST) {
		tfm = crypto_alloc_shash(hash_algo_name[algo], 0, 0);
		if (IS_ERR(tfm)) {
			rc = PTR_ERR(tfm);
			pr_err("Can not allocate %s (reason: %d)\n",
			       hash_algo_name[algo], rc);
		}
	}
	return tfm;
}

static void ima_free_tfm(struct crypto_shash *tfm)
{
	if (tfm != ima_shash_tfm)
		crypto_free_shash(tfm);
}

/*
 * Calculate the MD5/SHA1 file digest
 */
static int ima_calc_file_hash_tfm(struct file *file,
				  struct ima_digest_data *hash,
				  struct crypto_shash *tfm)
{
	loff_t i_size, offset = 0;
	char *rbuf;
	int rc, read = 0;
	struct {
		struct shash_desc shash;
		char ctx[crypto_shash_descsize(tfm)];
	} desc;

	desc.shash.tfm = tfm;
	desc.shash.flags = 0;

	hash->length = crypto_shash_digestsize(tfm);

	rc = crypto_shash_init(&desc.shash);
	if (rc != 0)
		return rc;

	rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (!rbuf) {
		rc = -ENOMEM;
		goto out;
	}
	if (!(file->f_mode & FMODE_READ)) {
		file->f_mode |= FMODE_READ;
		read = 1;
	}
	i_size = i_size_read(file_inode(file));
	while (offset < i_size) {
		int rbuf_len;

		rbuf_len = kernel_read(file, offset, rbuf, PAGE_SIZE);
		if (rbuf_len < 0) {
			rc = rbuf_len;
			break;
		}
		if (rbuf_len == 0)
			break;
		offset += rbuf_len;

		rc = crypto_shash_update(&desc.shash, rbuf, rbuf_len);
		if (rc)
			break;
	}
	kfree(rbuf);
	if (!rc)
		rc = crypto_shash_final(&desc.shash, hash->digest);
	if (read)
		file->f_mode &= ~FMODE_READ;
out:
	return rc;
}

int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
{
	struct crypto_shash *tfm;
	int rc;

	tfm = ima_alloc_tfm(hash->algo);
	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	rc = ima_calc_file_hash_tfm(file, hash, tfm);

	ima_free_tfm(tfm);

	return rc;
}

/*
 * Calculate the hash of a given buffer
 */
int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
{
	struct {
		struct shash_desc shash;
		char ctx[crypto_shash_descsize(ima_shash_tfm)];
	} desc;

	desc.shash.tfm = ima_shash_tfm;
	desc.shash.flags = 0;

	/* this function uses default algo */
	hash->algo = ima_hash_algo;
	hash->length = crypto_shash_digestsize(ima_shash_tfm);

	return crypto_shash_digest(&desc.shash, buf, len, hash->digest);
}

static void __init ima_pcrread(int idx, u8 *pcr)
{
	if (!ima_used_chip)
		return;

	if (tpm_pcr_read(TPM_ANY_NUM, idx, pcr) != 0)
		pr_err("IMA: Error Communicating to TPM chip\n");
}

/*
 * Calculate the boot aggregate hash
 */
int __init ima_calc_boot_aggregate(char *digest)
{
	u8 pcr_i[TPM_DIGEST_SIZE];
	int rc, i;
	struct {
		struct shash_desc shash;
		char ctx[crypto_shash_descsize(ima_shash_tfm)];
	} desc;

	desc.shash.tfm = ima_shash_tfm;
	desc.shash.flags = 0;

	rc = crypto_shash_init(&desc.shash);
	if (rc != 0)
		return rc;

	/* cumulative sha1 over tpm registers 0-7 */
	for (i = TPM_PCR0; i < TPM_PCR8; i++) {
		ima_pcrread(i, pcr_i);
		/* now accumulate with current aggregate */
		rc = crypto_shash_update(&desc.shash, pcr_i, TPM_DIGEST_SIZE);
	}
	if (!rc)
		crypto_shash_final(&desc.shash, digest);
	return rc;
}