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_BINARY_NO_FIELD_LEN,
30 IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
31 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
33 /* digest size for IMA, fits SHA1 or MD5 */
34 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
35 #define IMA_EVENT_NAME_LEN_MAX 255
37 #define IMA_HASH_BITS 10
38 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
40 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
41 #define IMA_TEMPLATE_NUM_FIELDS_MAX 15
43 #define IMA_TEMPLATE_IMA_NAME "ima"
44 #define IMA_TEMPLATE_IMA_FMT "d|n"
46 /* current content of the policy */
47 extern int ima_policy_flag;
49 /* set during initialization */
50 extern int ima_initialized;
51 extern int ima_used_chip;
52 extern int ima_hash_algo;
53 extern int ima_appraise;
55 /* IMA event related data */
56 struct ima_event_data {
57 struct integrity_iint_cache *iint;
59 const unsigned char *filename;
60 struct evm_ima_xattr_data *xattr_value;
62 const char *violation;
65 /* IMA template field data definition */
66 struct ima_field_data {
71 /* IMA template field definition */
72 struct ima_template_field {
73 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
74 int (*field_init)(struct ima_event_data *event_data,
75 struct ima_field_data *field_data);
76 void (*field_show)(struct seq_file *m, enum ima_show_type show,
77 struct ima_field_data *field_data);
80 /* IMA template descriptor definition */
81 struct ima_template_desc {
85 struct ima_template_field **fields;
88 struct ima_template_entry {
89 u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
90 struct ima_template_desc *template_desc; /* template descriptor */
91 u32 template_data_len;
92 struct ima_field_data template_data[0]; /* template related data */
95 struct ima_queue_entry {
96 struct hlist_node hnext; /* place in hash collision list */
97 struct list_head later; /* place in ima_measurements list */
98 struct ima_template_entry *entry;
100 extern struct list_head ima_measurements; /* list of all measurements */
102 /* Internal IMA function definitions */
104 int ima_fs_init(void);
105 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
106 const char *op, struct inode *inode,
107 const unsigned char *filename);
108 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
109 int ima_calc_field_array_hash(struct ima_field_data *field_data,
110 struct ima_template_desc *desc, int num_fields,
111 struct ima_digest_data *hash);
112 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
113 void ima_add_violation(struct file *file, const unsigned char *filename,
114 struct integrity_iint_cache *iint,
115 const char *op, const char *cause);
116 int ima_init_crypto(void);
117 void ima_putc(struct seq_file *m, void *data, int datalen);
118 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
119 struct ima_template_desc *ima_template_desc_current(void);
120 int ima_init_template(void);
123 * used to protect h_table and sha_table
125 extern spinlock_t ima_queue_lock;
128 atomic_long_t len; /* number of stored measurements in the list */
129 atomic_long_t violations;
130 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
132 extern struct ima_h_table ima_htable;
134 static inline unsigned int ima_hash_key(u8 *digest)
136 /* there is no point in taking a hash of part of a digest */
137 return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
140 /* LIM API function definitions */
141 int ima_get_action(struct inode *inode, int mask, int function);
142 int ima_must_measure(struct inode *inode, int mask, int function);
143 int ima_collect_measurement(struct integrity_iint_cache *iint,
145 struct evm_ima_xattr_data **xattr_value,
147 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
148 const unsigned char *filename,
149 struct evm_ima_xattr_data *xattr_value,
151 void ima_audit_measurement(struct integrity_iint_cache *iint,
152 const unsigned char *filename);
153 int ima_alloc_init_template(struct ima_event_data *event_data,
154 struct ima_template_entry **entry);
155 int ima_store_template(struct ima_template_entry *entry, int violation,
156 struct inode *inode, const unsigned char *filename);
157 void ima_free_template_entry(struct ima_template_entry *entry);
158 const char *ima_d_path(struct path *path, char **pathbuf);
160 /* IMA policy related functions */
161 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, FIRMWARE_CHECK, POST_SETATTR };
163 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
165 void ima_init_policy(void);
166 void ima_update_policy(void);
167 void ima_update_policy_flag(void);
168 ssize_t ima_parse_add_rule(char *);
169 void ima_delete_rules(void);
171 /* Appraise integrity measurements */
172 #define IMA_APPRAISE_ENFORCE 0x01
173 #define IMA_APPRAISE_FIX 0x02
174 #define IMA_APPRAISE_LOG 0x04
175 #define IMA_APPRAISE_MODULES 0x08
176 #define IMA_APPRAISE_FIRMWARE 0x10
178 #ifdef CONFIG_IMA_APPRAISE
179 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
180 struct file *file, const unsigned char *filename,
181 struct evm_ima_xattr_data *xattr_value,
182 int xattr_len, int opened);
183 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
184 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
185 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
187 void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
188 struct ima_digest_data *hash);
189 int ima_read_xattr(struct dentry *dentry,
190 struct evm_ima_xattr_data **xattr_value);
193 static inline int ima_appraise_measurement(int func,
194 struct integrity_iint_cache *iint,
196 const unsigned char *filename,
197 struct evm_ima_xattr_data *xattr_value,
198 int xattr_len, int opened)
200 return INTEGRITY_UNKNOWN;
203 static inline int ima_must_appraise(struct inode *inode, int mask,
209 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
214 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
217 return INTEGRITY_UNKNOWN;
220 static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
222 struct ima_digest_data *hash)
226 static inline int ima_read_xattr(struct dentry *dentry,
227 struct evm_ima_xattr_data **xattr_value)
234 /* LSM based policy rules require audit */
235 #ifdef CONFIG_IMA_LSM_RULES
237 #define security_filter_rule_init security_audit_rule_init
238 #define security_filter_rule_match security_audit_rule_match
242 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
248 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
250 struct audit_context *actx)
254 #endif /* CONFIG_IMA_LSM_RULES */
256 #ifdef CONFIG_IMA_TRUSTED_KEYRING
257 static inline int ima_init_keyring(const unsigned int id)
259 return integrity_init_keyring(id);
262 static inline int ima_init_keyring(const unsigned int id)
266 #endif /* CONFIG_IMA_TRUSTED_KEYRING */