2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Mimi Zohar <zohar@us.ibm.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation, version 2 of the
14 * internal Integrity Measurement Architecture (IMA) definitions
20 #include <linux/types.h>
21 #include <linux/crypto.h>
22 #include <linux/security.h>
23 #include <linux/hash.h>
24 #include <linux/tpm.h>
25 #include <linux/audit.h>
27 #include "../integrity.h"
29 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
30 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
32 /* digest size for IMA, fits SHA1 or MD5 */
33 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
34 #define IMA_EVENT_NAME_LEN_MAX 255
36 #define IMA_HASH_BITS 9
37 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
39 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
40 #define IMA_TEMPLATE_NUM_FIELDS_MAX 15
42 #define IMA_TEMPLATE_IMA_NAME "ima"
43 #define IMA_TEMPLATE_IMA_FMT "d|n"
45 /* set during initialization */
46 extern int ima_initialized;
47 extern int ima_used_chip;
48 extern int ima_hash_algo;
49 extern int ima_appraise;
51 /* IMA template field data definition */
52 struct ima_field_data {
57 /* IMA template field definition */
58 struct ima_template_field {
59 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
60 int (*field_init) (struct integrity_iint_cache *iint, struct file *file,
61 const unsigned char *filename,
62 struct evm_ima_xattr_data *xattr_value,
63 int xattr_len, struct ima_field_data *field_data);
64 void (*field_show) (struct seq_file *m, enum ima_show_type show,
65 struct ima_field_data *field_data);
68 /* IMA template descriptor definition */
69 struct ima_template_desc {
73 struct ima_template_field **fields;
76 struct ima_template_entry {
77 u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
78 struct ima_template_desc *template_desc; /* template descriptor */
79 u32 template_data_len;
80 struct ima_field_data template_data[0]; /* template related data */
83 struct ima_queue_entry {
84 struct hlist_node hnext; /* place in hash collision list */
85 struct list_head later; /* place in ima_measurements list */
86 struct ima_template_entry *entry;
88 extern struct list_head ima_measurements; /* list of all measurements */
90 /* Internal IMA function definitions */
92 void ima_cleanup(void);
93 int ima_fs_init(void);
94 void ima_fs_cleanup(void);
95 int ima_inode_alloc(struct inode *inode);
96 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
97 const char *op, struct inode *inode,
98 const unsigned char *filename);
99 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
100 int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields,
101 struct ima_digest_data *hash);
102 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
103 void ima_add_violation(struct file *file, const unsigned char *filename,
104 const char *op, const char *cause);
105 int ima_init_crypto(void);
106 void ima_putc(struct seq_file *m, void *data, int datalen);
107 void ima_print_digest(struct seq_file *m, u8 *digest, int size);
108 struct ima_template_desc *ima_template_desc_current(void);
109 int ima_init_template(void);
111 int ima_init_template(void);
114 * used to protect h_table and sha_table
116 extern spinlock_t ima_queue_lock;
119 atomic_long_t len; /* number of stored measurements in the list */
120 atomic_long_t violations;
121 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
123 extern struct ima_h_table ima_htable;
125 static inline unsigned long ima_hash_key(u8 *digest)
127 return hash_long(*digest, IMA_HASH_BITS);
130 /* LIM API function definitions */
131 int ima_get_action(struct inode *inode, int mask, int function);
132 int ima_must_measure(struct inode *inode, int mask, int function);
133 int ima_collect_measurement(struct integrity_iint_cache *iint,
135 struct evm_ima_xattr_data **xattr_value,
137 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
138 const unsigned char *filename,
139 struct evm_ima_xattr_data *xattr_value,
141 void ima_audit_measurement(struct integrity_iint_cache *iint,
142 const unsigned char *filename);
143 int ima_alloc_init_template(struct integrity_iint_cache *iint,
144 struct file *file, const unsigned char *filename,
145 struct evm_ima_xattr_data *xattr_value,
146 int xattr_len, struct ima_template_entry **entry);
147 int ima_store_template(struct ima_template_entry *entry, int violation,
148 struct inode *inode, const unsigned char *filename);
149 const char *ima_d_path(struct path *path, char **pathbuf);
151 /* rbtree tree calls to lookup, insert, delete
152 * integrity data associated with an inode.
154 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
155 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
157 /* IMA policy related functions */
158 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR };
160 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
162 void ima_init_policy(void);
163 void ima_update_policy(void);
164 ssize_t ima_parse_add_rule(char *);
165 void ima_delete_rules(void);
167 /* Appraise integrity measurements */
168 #define IMA_APPRAISE_ENFORCE 0x01
169 #define IMA_APPRAISE_FIX 0x02
170 #define IMA_APPRAISE_MODULES 0x04
172 #ifdef CONFIG_IMA_APPRAISE
173 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
174 struct file *file, const unsigned char *filename,
175 struct evm_ima_xattr_data *xattr_value,
177 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
178 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
179 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
181 void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
182 struct ima_digest_data *hash);
183 int ima_read_xattr(struct dentry *dentry,
184 struct evm_ima_xattr_data **xattr_value);
187 static inline int ima_appraise_measurement(int func,
188 struct integrity_iint_cache *iint,
190 const unsigned char *filename,
191 struct evm_ima_xattr_data *xattr_value,
194 return INTEGRITY_UNKNOWN;
197 static inline int ima_must_appraise(struct inode *inode, int mask,
203 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
208 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
211 return INTEGRITY_UNKNOWN;
214 static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
216 struct ima_digest_data *hash)
220 static inline int ima_read_xattr(struct dentry *dentry,
221 struct evm_ima_xattr_data **xattr_value)
228 /* LSM based policy rules require audit */
229 #ifdef CONFIG_IMA_LSM_RULES
231 #define security_filter_rule_init security_audit_rule_init
232 #define security_filter_rule_match security_audit_rule_match
236 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
242 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
244 struct audit_context *actx)
248 #endif /* CONFIG_IMA_LSM_RULES */