Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 1 | /* |
| 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 Kasatkin | e075125 | 2013-02-07 00:12:08 +0200 | [diff] [blame] | 17 | #include <linux/key.h> |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 18 | |
Dmitry Kasatkin | 45e2472 | 2012-09-12 20:51:32 +0300 | [diff] [blame] | 19 | /* iint action cache flags */ |
Mimi Zohar | f578c08 | 2012-12-05 09:29:09 -0500 | [diff] [blame] | 20 | #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 Kasatkin | 45e2472 | 2012-09-12 20:51:32 +0300 | [diff] [blame] | 28 | |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 29 | /* iint cache flags */ |
Mimi Zohar | f578c08 | 2012-12-05 09:29:09 -0500 | [diff] [blame] | 30 | #define IMA_ACTION_FLAGS 0xff000000 |
| 31 | #define IMA_DIGSIG 0x01000000 |
| 32 | #define IMA_DIGSIG_REQUIRED 0x02000000 |
Dmitry Kasatkin | 45e2472 | 2012-09-12 20:51:32 +0300 | [diff] [blame] | 33 | |
Mimi Zohar | d79d72e | 2012-12-03 17:08:11 -0500 | [diff] [blame] | 34 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
| 35 | IMA_APPRAISE_SUBMASK) |
| 36 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
| 37 | IMA_COLLECTED | IMA_APPRAISED_SUBMASK) |
| 38 | |
| 39 | /* iint subaction appraise cache flags */ |
| 40 | #define IMA_FILE_APPRAISE 0x00000100 |
| 41 | #define IMA_FILE_APPRAISED 0x00000200 |
| 42 | #define IMA_MMAP_APPRAISE 0x00000400 |
| 43 | #define IMA_MMAP_APPRAISED 0x00000800 |
| 44 | #define IMA_BPRM_APPRAISE 0x00001000 |
| 45 | #define IMA_BPRM_APPRAISED 0x00002000 |
| 46 | #define IMA_MODULE_APPRAISE 0x00004000 |
| 47 | #define IMA_MODULE_APPRAISED 0x00008000 |
| 48 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
| 49 | IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE) |
| 50 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
| 51 | IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED) |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 52 | |
Dmitry Kasatkin | 6be5cc5 | 2011-03-09 14:28:20 -0500 | [diff] [blame] | 53 | enum evm_ima_xattr_type { |
| 54 | IMA_XATTR_DIGEST = 0x01, |
| 55 | EVM_XATTR_HMAC, |
| 56 | EVM_IMA_XATTR_DIGSIG, |
Dmitry Kasatkin | 3ea7a56 | 2013-08-12 11:22:51 +0300 | [diff] [blame] | 57 | IMA_XATTR_DIGEST_NG, |
Dmitry Kasatkin | 6be5cc5 | 2011-03-09 14:28:20 -0500 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | struct evm_ima_xattr_data { |
| 61 | u8 type; |
| 62 | u8 digest[SHA1_DIGEST_SIZE]; |
Dmitry Kasatkin | c7c8bb2 | 2013-04-25 10:43:56 +0300 | [diff] [blame] | 63 | } __packed; |
| 64 | |
| 65 | #define IMA_MAX_DIGEST_SIZE 64 |
| 66 | |
| 67 | struct ima_digest_data { |
| 68 | u8 algo; |
| 69 | u8 length; |
Dmitry Kasatkin | 3ea7a56 | 2013-08-12 11:22:51 +0300 | [diff] [blame] | 70 | union { |
| 71 | struct { |
| 72 | u8 unused; |
| 73 | u8 type; |
| 74 | } sha1; |
| 75 | struct { |
| 76 | u8 type; |
| 77 | u8 algo; |
| 78 | } ng; |
| 79 | u8 data[2]; |
| 80 | } xattr; |
Dmitry Kasatkin | a35c3fb | 2013-04-25 10:44:04 +0300 | [diff] [blame] | 81 | u8 digest[0]; |
Dmitry Kasatkin | c7c8bb2 | 2013-04-25 10:43:56 +0300 | [diff] [blame] | 82 | } __packed; |
Dmitry Kasatkin | 6be5cc5 | 2011-03-09 14:28:20 -0500 | [diff] [blame] | 83 | |
Dmitry Kasatkin | d3634d0 | 2013-04-25 10:44:04 +0300 | [diff] [blame] | 84 | /* |
| 85 | * signature format v2 - for using with asymmetric keys |
| 86 | */ |
| 87 | struct signature_v2_hdr { |
Dmitry Kasatkin | b1aaab2 | 2013-10-10 16:12:03 +0900 | [diff] [blame] | 88 | uint8_t type; /* xattr type */ |
Dmitry Kasatkin | d3634d0 | 2013-04-25 10:44:04 +0300 | [diff] [blame] | 89 | uint8_t version; /* signature format version */ |
| 90 | uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ |
| 91 | uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ |
| 92 | uint16_t sig_size; /* signature size */ |
| 93 | uint8_t sig[0]; /* signature payload */ |
| 94 | } __packed; |
| 95 | |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 96 | /* integrity data associated with an inode */ |
| 97 | struct integrity_iint_cache { |
Dmitry Kasatkin | c7c8bb2 | 2013-04-25 10:43:56 +0300 | [diff] [blame] | 98 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 99 | struct inode *inode; /* back pointer to inode in question */ |
| 100 | u64 version; /* track inode changes */ |
Mimi Zohar | f578c08 | 2012-12-05 09:29:09 -0500 | [diff] [blame] | 101 | unsigned long flags; |
Mimi Zohar | d79d72e | 2012-12-03 17:08:11 -0500 | [diff] [blame] | 102 | enum integrity_status ima_file_status:4; |
| 103 | enum integrity_status ima_mmap_status:4; |
| 104 | enum integrity_status ima_bprm_status:4; |
| 105 | enum integrity_status ima_module_status:4; |
Dmitry Kasatkin | ee86633 | 2012-09-21 17:00:43 +0300 | [diff] [blame] | 106 | enum integrity_status evm_status:4; |
Dmitry Kasatkin | a35c3fb | 2013-04-25 10:44:04 +0300 | [diff] [blame] | 107 | struct ima_digest_data *ima_hash; |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 108 | }; |
| 109 | |
| 110 | /* rbtree tree calls to lookup, insert, delete |
| 111 | * integrity data associated with an inode. |
| 112 | */ |
| 113 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); |
| 114 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
James Morris | 4892722 | 2011-08-17 10:34:33 +1000 | [diff] [blame] | 115 | |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 116 | #define INTEGRITY_KEYRING_EVM 0 |
| 117 | #define INTEGRITY_KEYRING_MODULE 1 |
| 118 | #define INTEGRITY_KEYRING_IMA 2 |
| 119 | #define INTEGRITY_KEYRING_MAX 3 |
| 120 | |
Dmitry Kasatkin | f1be242 | 2012-01-17 17:12:07 +0200 | [diff] [blame] | 121 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 122 | |
| 123 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
Dmitry Kasatkin | 089bc8e | 2013-10-10 15:56:13 +0900 | [diff] [blame] | 124 | const char *digest, int digestlen); |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 125 | |
| 126 | #else |
| 127 | |
| 128 | static inline int integrity_digsig_verify(const unsigned int id, |
| 129 | const char *sig, int siglen, |
| 130 | const char *digest, int digestlen) |
| 131 | { |
| 132 | return -EOPNOTSUPP; |
| 133 | } |
| 134 | |
Dmitry Kasatkin | f1be242 | 2012-01-17 17:12:07 +0200 | [diff] [blame] | 135 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 136 | |
Dmitry Kasatkin | e075125 | 2013-02-07 00:12:08 +0200 | [diff] [blame] | 137 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
| 138 | int asymmetric_verify(struct key *keyring, const char *sig, |
| 139 | int siglen, const char *data, int datalen); |
| 140 | #else |
| 141 | static inline int asymmetric_verify(struct key *keyring, const char *sig, |
| 142 | int siglen, const char *data, int datalen) |
| 143 | { |
| 144 | return -EOPNOTSUPP; |
| 145 | } |
| 146 | #endif |
| 147 | |
Mimi Zohar | d726d8d | 2013-03-18 14:48:02 -0400 | [diff] [blame] | 148 | #ifdef CONFIG_INTEGRITY_AUDIT |
| 149 | /* declarations */ |
| 150 | void integrity_audit_msg(int audit_msgno, struct inode *inode, |
| 151 | const unsigned char *fname, const char *op, |
| 152 | const char *cause, int result, int info); |
| 153 | #else |
| 154 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, |
| 155 | const unsigned char *fname, |
| 156 | const char *op, const char *cause, |
| 157 | int result, int info) |
| 158 | { |
| 159 | } |
| 160 | #endif |
| 161 | |
James Morris | 4892722 | 2011-08-17 10:34:33 +1000 | [diff] [blame] | 162 | /* set during initialization */ |
| 163 | extern int iint_initialized; |