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Mimi Zoharf381c272011-03-09 14:13:22 -05001/*
2 * Copyright (C) 2009-2010 IBM Corporation
3 *
4 * Authors:
5 * Mimi Zohar <zohar@us.ibm.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, version 2 of the
10 * License.
11 *
12 */
13
14#include <linux/types.h>
15#include <linux/integrity.h>
16#include <crypto/sha.h>
Dmitry Kasatkine0751252013-02-07 00:12:08 +020017#include <linux/key.h>
Mimi Zoharf381c272011-03-09 14:13:22 -050018
Dmitry Kasatkin45e24722012-09-12 20:51:32 +030019/* iint action cache flags */
Mimi Zoharf578c082012-12-05 09:29:09 -050020#define IMA_MEASURE 0x00000001
21#define IMA_MEASURED 0x00000002
22#define IMA_APPRAISE 0x00000004
23#define IMA_APPRAISED 0x00000008
24/*#define IMA_COLLECT 0x00000010 do not use this flag */
25#define IMA_COLLECTED 0x00000020
26#define IMA_AUDIT 0x00000040
27#define IMA_AUDITED 0x00000080
Dmitry Kasatkin45e24722012-09-12 20:51:32 +030028
Mimi Zoharf381c272011-03-09 14:13:22 -050029/* iint cache flags */
Mimi Zoharf578c082012-12-05 09:29:09 -050030#define IMA_ACTION_FLAGS 0xff000000
31#define IMA_DIGSIG 0x01000000
32#define IMA_DIGSIG_REQUIRED 0x02000000
Mimi Zoharf9b2a732014-05-12 09:28:11 -040033#define IMA_PERMIT_DIRECTIO 0x04000000
Dmitry Kasatkin45e24722012-09-12 20:51:32 +030034
Mimi Zohard79d72e2012-12-03 17:08:11 -050035#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
36 IMA_APPRAISE_SUBMASK)
37#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
38 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
39
40/* iint subaction appraise cache flags */
41#define IMA_FILE_APPRAISE 0x00000100
42#define IMA_FILE_APPRAISED 0x00000200
43#define IMA_MMAP_APPRAISE 0x00000400
44#define IMA_MMAP_APPRAISED 0x00000800
45#define IMA_BPRM_APPRAISE 0x00001000
46#define IMA_BPRM_APPRAISED 0x00002000
47#define IMA_MODULE_APPRAISE 0x00004000
48#define IMA_MODULE_APPRAISED 0x00008000
49#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
50 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
51#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
52 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
Mimi Zoharf381c272011-03-09 14:13:22 -050053
Dmitry Kasatkin6be5cc52011-03-09 14:28:20 -050054enum evm_ima_xattr_type {
55 IMA_XATTR_DIGEST = 0x01,
56 EVM_XATTR_HMAC,
57 EVM_IMA_XATTR_DIGSIG,
Dmitry Kasatkin3ea7a562013-08-12 11:22:51 +030058 IMA_XATTR_DIGEST_NG,
Dmitry Kasatkin6be5cc52011-03-09 14:28:20 -050059};
60
61struct evm_ima_xattr_data {
62 u8 type;
63 u8 digest[SHA1_DIGEST_SIZE];
Dmitry Kasatkinc7c8bb22013-04-25 10:43:56 +030064} __packed;
65
66#define IMA_MAX_DIGEST_SIZE 64
67
68struct ima_digest_data {
69 u8 algo;
70 u8 length;
Dmitry Kasatkin3ea7a562013-08-12 11:22:51 +030071 union {
72 struct {
73 u8 unused;
74 u8 type;
75 } sha1;
76 struct {
77 u8 type;
78 u8 algo;
79 } ng;
80 u8 data[2];
81 } xattr;
Dmitry Kasatkina35c3fb2013-04-25 10:44:04 +030082 u8 digest[0];
Dmitry Kasatkinc7c8bb22013-04-25 10:43:56 +030083} __packed;
Dmitry Kasatkin6be5cc52011-03-09 14:28:20 -050084
Dmitry Kasatkind3634d02013-04-25 10:44:04 +030085/*
86 * signature format v2 - for using with asymmetric keys
87 */
88struct signature_v2_hdr {
Dmitry Kasatkinb1aaab22013-10-10 16:12:03 +090089 uint8_t type; /* xattr type */
Dmitry Kasatkind3634d02013-04-25 10:44:04 +030090 uint8_t version; /* signature format version */
91 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */
92 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
93 uint16_t sig_size; /* signature size */
94 uint8_t sig[0]; /* signature payload */
95} __packed;
96
Mimi Zoharf381c272011-03-09 14:13:22 -050097/* integrity data associated with an inode */
98struct integrity_iint_cache {
Dmitry Kasatkinc7c8bb22013-04-25 10:43:56 +030099 struct rb_node rb_node; /* rooted in integrity_iint_tree */
Mimi Zoharf381c272011-03-09 14:13:22 -0500100 struct inode *inode; /* back pointer to inode in question */
101 u64 version; /* track inode changes */
Mimi Zoharf578c082012-12-05 09:29:09 -0500102 unsigned long flags;
Mimi Zohard79d72e2012-12-03 17:08:11 -0500103 enum integrity_status ima_file_status:4;
104 enum integrity_status ima_mmap_status:4;
105 enum integrity_status ima_bprm_status:4;
106 enum integrity_status ima_module_status:4;
Dmitry Kasatkinee866332012-09-21 17:00:43 +0300107 enum integrity_status evm_status:4;
Dmitry Kasatkina35c3fb2013-04-25 10:44:04 +0300108 struct ima_digest_data *ima_hash;
Mimi Zoharf381c272011-03-09 14:13:22 -0500109};
110
111/* rbtree tree calls to lookup, insert, delete
112 * integrity data associated with an inode.
113 */
114struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
115struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
James Morris48927222011-08-17 10:34:33 +1000116
Dmitry Kasatkin8607c502011-10-05 11:54:46 +0300117#define INTEGRITY_KEYRING_EVM 0
118#define INTEGRITY_KEYRING_MODULE 1
119#define INTEGRITY_KEYRING_IMA 2
120#define INTEGRITY_KEYRING_MAX 3
121
Dmitry Kasatkinf1be2422012-01-17 17:12:07 +0200122#ifdef CONFIG_INTEGRITY_SIGNATURE
Dmitry Kasatkin8607c502011-10-05 11:54:46 +0300123
124int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
Dmitry Kasatkin089bc8e2013-10-10 15:56:13 +0900125 const char *digest, int digestlen);
Dmitry Kasatkin8607c502011-10-05 11:54:46 +0300126
127#else
128
129static inline int integrity_digsig_verify(const unsigned int id,
130 const char *sig, int siglen,
131 const char *digest, int digestlen)
132{
133 return -EOPNOTSUPP;
134}
135
Dmitry Kasatkinf1be2422012-01-17 17:12:07 +0200136#endif /* CONFIG_INTEGRITY_SIGNATURE */
Dmitry Kasatkin8607c502011-10-05 11:54:46 +0300137
Dmitry Kasatkine0751252013-02-07 00:12:08 +0200138#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
139int asymmetric_verify(struct key *keyring, const char *sig,
140 int siglen, const char *data, int datalen);
141#else
142static inline int asymmetric_verify(struct key *keyring, const char *sig,
143 int siglen, const char *data, int datalen)
144{
145 return -EOPNOTSUPP;
146}
147#endif
148
Mimi Zohard726d8d2013-03-18 14:48:02 -0400149#ifdef CONFIG_INTEGRITY_AUDIT
150/* declarations */
151void integrity_audit_msg(int audit_msgno, struct inode *inode,
152 const unsigned char *fname, const char *op,
153 const char *cause, int result, int info);
154#else
155static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
156 const unsigned char *fname,
157 const char *op, const char *cause,
158 int result, int info)
159{
160}
161#endif
162
James Morris48927222011-08-17 10:34:33 +1000163/* set during initialization */
164extern int iint_initialized;