1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2009-2010 IBM Corporation
6 * Mimi Zohar <zohar@us.ibm.com>
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/types.h>
16 #include <linux/integrity.h>
17 #include <crypto/sha1.h>
18 #include <linux/key.h>
19 #include <linux/audit.h>
21 /* iint action cache flags */
22 #define IMA_MEASURE 0x00000001
23 #define IMA_MEASURED 0x00000002
24 #define IMA_APPRAISE 0x00000004
25 #define IMA_APPRAISED 0x00000008
26 /*#define IMA_COLLECT 0x00000010 do not use this flag */
27 #define IMA_COLLECTED 0x00000020
28 #define IMA_AUDIT 0x00000040
29 #define IMA_AUDITED 0x00000080
30 #define IMA_HASH 0x00000100
31 #define IMA_HASHED 0x00000200
33 /* iint cache flags */
34 #define IMA_ACTION_FLAGS 0xff000000
35 #define IMA_DIGSIG_REQUIRED 0x01000000
36 #define IMA_PERMIT_DIRECTIO 0x02000000
37 #define IMA_NEW_FILE 0x04000000
38 #define EVM_IMMUTABLE_DIGSIG 0x08000000
39 #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
40 #define IMA_MODSIG_ALLOWED 0x20000000
41 #define IMA_CHECK_BLACKLIST 0x40000000
43 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
44 IMA_HASH | IMA_APPRAISE_SUBMASK)
45 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
46 IMA_HASHED | IMA_COLLECTED | \
47 IMA_APPRAISED_SUBMASK)
49 /* iint subaction appraise cache flags */
50 #define IMA_FILE_APPRAISE 0x00001000
51 #define IMA_FILE_APPRAISED 0x00002000
52 #define IMA_MMAP_APPRAISE 0x00004000
53 #define IMA_MMAP_APPRAISED 0x00008000
54 #define IMA_BPRM_APPRAISE 0x00010000
55 #define IMA_BPRM_APPRAISED 0x00020000
56 #define IMA_READ_APPRAISE 0x00040000
57 #define IMA_READ_APPRAISED 0x00080000
58 #define IMA_CREDS_APPRAISE 0x00100000
59 #define IMA_CREDS_APPRAISED 0x00200000
60 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
61 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
63 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
64 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
67 /* iint cache atomic_flags */
68 #define IMA_CHANGE_XATTR 0
69 #define IMA_UPDATE_XATTR 1
70 #define IMA_CHANGE_ATTR 2
72 #define IMA_MUST_MEASURE 4
74 enum evm_ima_xattr_type {
75 IMA_XATTR_DIGEST = 0x01,
79 EVM_XATTR_PORTABLE_DIGSIG,
83 struct evm_ima_xattr_data {
88 /* Only used in the EVM HMAC code. */
90 struct evm_ima_xattr_data data;
91 u8 digest[SHA1_DIGEST_SIZE];
94 #define IMA_MAX_DIGEST_SIZE 64
96 struct ima_digest_data {
114 * signature format v2 - for using with asymmetric keys
116 struct signature_v2_hdr {
117 uint8_t type; /* xattr type */
118 uint8_t version; /* signature format version */
119 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
120 __be32 keyid; /* IMA key identifier - not X509/PGP specific */
121 __be16 sig_size; /* signature size */
122 uint8_t sig[]; /* signature payload */
125 /* integrity data associated with an inode */
126 struct integrity_iint_cache {
127 struct rb_node rb_node; /* rooted in integrity_iint_tree */
128 struct mutex mutex; /* protects: version, flags, digest */
129 struct inode *inode; /* back pointer to inode in question */
130 u64 version; /* track inode changes */
132 unsigned long measured_pcrs;
133 unsigned long atomic_flags;
134 enum integrity_status ima_file_status:4;
135 enum integrity_status ima_mmap_status:4;
136 enum integrity_status ima_bprm_status:4;
137 enum integrity_status ima_read_status:4;
138 enum integrity_status ima_creds_status:4;
139 enum integrity_status evm_status:4;
140 struct ima_digest_data *ima_hash;
143 /* rbtree tree calls to lookup, insert, delete
144 * integrity data associated with an inode.
146 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
148 int integrity_kernel_read(struct file *file, loff_t offset,
149 void *addr, unsigned long count);
151 #define INTEGRITY_KEYRING_EVM 0
152 #define INTEGRITY_KEYRING_IMA 1
153 #define INTEGRITY_KEYRING_PLATFORM 2
154 #define INTEGRITY_KEYRING_MAX 3
156 extern struct dentry *integrity_dir;
160 #ifdef CONFIG_INTEGRITY_SIGNATURE
162 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
163 const char *digest, int digestlen);
164 int integrity_modsig_verify(unsigned int id, const struct modsig *modsig);
166 int __init integrity_init_keyring(const unsigned int id);
167 int __init integrity_load_x509(const unsigned int id, const char *path);
168 int __init integrity_load_cert(const unsigned int id, const char *source,
169 const void *data, size_t len, key_perm_t perm);
172 static inline int integrity_digsig_verify(const unsigned int id,
173 const char *sig, int siglen,
174 const char *digest, int digestlen)
179 static inline int integrity_modsig_verify(unsigned int id,
180 const struct modsig *modsig)
185 static inline int integrity_init_keyring(const unsigned int id)
190 static inline int __init integrity_load_cert(const unsigned int id,
192 const void *data, size_t len,
197 #endif /* CONFIG_INTEGRITY_SIGNATURE */
199 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
200 int asymmetric_verify(struct key *keyring, const char *sig,
201 int siglen, const char *data, int datalen);
203 static inline int asymmetric_verify(struct key *keyring, const char *sig,
204 int siglen, const char *data, int datalen)
210 #ifdef CONFIG_IMA_APPRAISE_MODSIG
211 int ima_modsig_verify(struct key *keyring, const struct modsig *modsig);
213 static inline int ima_modsig_verify(struct key *keyring,
214 const struct modsig *modsig)
220 #ifdef CONFIG_IMA_LOAD_X509
221 void __init ima_load_x509(void);
223 static inline void ima_load_x509(void)
228 #ifdef CONFIG_EVM_LOAD_X509
229 void __init evm_load_x509(void);
231 static inline void evm_load_x509(void)
236 #ifdef CONFIG_INTEGRITY_AUDIT
238 void integrity_audit_msg(int audit_msgno, struct inode *inode,
239 const unsigned char *fname, const char *op,
240 const char *cause, int result, int info);
242 void integrity_audit_message(int audit_msgno, struct inode *inode,
243 const unsigned char *fname, const char *op,
244 const char *cause, int result, int info,
247 static inline struct audit_buffer *
248 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
250 return audit_log_start(ctx, gfp_mask, type);
254 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
255 const unsigned char *fname,
256 const char *op, const char *cause,
257 int result, int info)
261 static inline void integrity_audit_message(int audit_msgno,
263 const unsigned char *fname,
264 const char *op, const char *cause,
265 int result, int info, int errno)
269 static inline struct audit_buffer *
270 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
277 #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
278 void __init add_to_platform_keyring(const char *source, const void *data,
281 static inline void __init add_to_platform_keyring(const char *source,
282 const void *data, size_t len)