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Linux/security/integrity/ima/ima.h

  1 /*
  2  * Copyright (C) 2005,2006,2007,2008 IBM Corporation
  3  *
  4  * Authors:
  5  * Reiner Sailer <sailer@watson.ibm.com>
  6  * Mimi Zohar <zohar@us.ibm.com>
  7  *
  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
 11  * License.
 12  *
 13  * File: ima.h
 14  *      internal Integrity Measurement Architecture (IMA) definitions
 15  */
 16 
 17 #ifndef __LINUX_IMA_H
 18 #define __LINUX_IMA_H
 19 
 20 #include <linux/types.h>
 21 #include <linux/crypto.h>
 22 #include <linux/fs.h>
 23 #include <linux/security.h>
 24 #include <linux/hash.h>
 25 #include <linux/tpm.h>
 26 #include <linux/audit.h>
 27 #include <crypto/hash_info.h>
 28 
 29 #include "../integrity.h"
 30 
 31 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 32                      IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 33 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
 34 
 35 /* digest size for IMA, fits SHA1 or MD5 */
 36 #define IMA_DIGEST_SIZE         SHA1_DIGEST_SIZE
 37 #define IMA_EVENT_NAME_LEN_MAX  255
 38 
 39 #define IMA_HASH_BITS 9
 40 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
 41 
 42 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN   16
 43 #define IMA_TEMPLATE_NUM_FIELDS_MAX     15
 44 
 45 #define IMA_TEMPLATE_IMA_NAME "ima"
 46 #define IMA_TEMPLATE_IMA_FMT "d|n"
 47 
 48 /* current content of the policy */
 49 extern int ima_policy_flag;
 50 
 51 /* set during initialization */
 52 extern int ima_initialized;
 53 extern int ima_used_chip;
 54 extern int ima_hash_algo;
 55 extern int ima_appraise;
 56 
 57 /* IMA event related data */
 58 struct ima_event_data {
 59         struct integrity_iint_cache *iint;
 60         struct file *file;
 61         const unsigned char *filename;
 62         struct evm_ima_xattr_data *xattr_value;
 63         int xattr_len;
 64         const char *violation;
 65 };
 66 
 67 /* IMA template field data definition */
 68 struct ima_field_data {
 69         u8 *data;
 70         u32 len;
 71 };
 72 
 73 /* IMA template field definition */
 74 struct ima_template_field {
 75         const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
 76         int (*field_init)(struct ima_event_data *event_data,
 77                           struct ima_field_data *field_data);
 78         void (*field_show)(struct seq_file *m, enum ima_show_type show,
 79                            struct ima_field_data *field_data);
 80 };
 81 
 82 /* IMA template descriptor definition */
 83 struct ima_template_desc {
 84         char *name;
 85         char *fmt;
 86         int num_fields;
 87         struct ima_template_field **fields;
 88 };
 89 
 90 struct ima_template_entry {
 91         int pcr;
 92         u8 digest[TPM_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
 93         struct ima_template_desc *template_desc; /* template descriptor */
 94         u32 template_data_len;
 95         struct ima_field_data template_data[0]; /* template related data */
 96 };
 97 
 98 struct ima_queue_entry {
 99         struct hlist_node hnext;        /* place in hash collision list */
100         struct list_head later;         /* place in ima_measurements list */
101         struct ima_template_entry *entry;
102 };
103 extern struct list_head ima_measurements;       /* list of all measurements */
104 
105 /* Internal IMA function definitions */
106 int ima_init(void);
107 int ima_fs_init(void);
108 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
109                            const char *op, struct inode *inode,
110                            const unsigned char *filename);
111 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
112 int ima_calc_buffer_hash(const void *buf, loff_t len,
113                          struct ima_digest_data *hash);
114 int ima_calc_field_array_hash(struct ima_field_data *field_data,
115                               struct ima_template_desc *desc, int num_fields,
116                               struct ima_digest_data *hash);
117 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
118 void ima_add_violation(struct file *file, const unsigned char *filename,
119                        struct integrity_iint_cache *iint,
120                        const char *op, const char *cause);
121 int ima_init_crypto(void);
122 void ima_putc(struct seq_file *m, void *data, int datalen);
123 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
124 struct ima_template_desc *ima_template_desc_current(void);
125 int ima_init_template(void);
126 
127 /*
128  * used to protect h_table and sha_table
129  */
130 extern spinlock_t ima_queue_lock;
131 
132 struct ima_h_table {
133         atomic_long_t len;      /* number of stored measurements in the list */
134         atomic_long_t violations;
135         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
136 };
137 extern struct ima_h_table ima_htable;
138 
139 static inline unsigned long ima_hash_key(u8 *digest)
140 {
141         return hash_long(*digest, IMA_HASH_BITS);
142 }
143 
144 enum ima_hooks {
145         FILE_CHECK = 1,
146         MMAP_CHECK,
147         BPRM_CHECK,
148         POST_SETATTR,
149         MODULE_CHECK,
150         FIRMWARE_CHECK,
151         KEXEC_KERNEL_CHECK,
152         KEXEC_INITRAMFS_CHECK,
153         POLICY_CHECK,
154         MAX_CHECK
155 };
156 
157 /* LIM API function definitions */
158 int ima_get_action(struct inode *inode, int mask,
159                    enum ima_hooks func, int *pcr);
160 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
161 int ima_collect_measurement(struct integrity_iint_cache *iint,
162                             struct file *file, void *buf, loff_t size,
163                             enum hash_algo algo);
164 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
165                            const unsigned char *filename,
166                            struct evm_ima_xattr_data *xattr_value,
167                            int xattr_len, int pcr);
168 void ima_audit_measurement(struct integrity_iint_cache *iint,
169                            const unsigned char *filename);
170 int ima_alloc_init_template(struct ima_event_data *event_data,
171                             struct ima_template_entry **entry);
172 int ima_store_template(struct ima_template_entry *entry, int violation,
173                        struct inode *inode,
174                        const unsigned char *filename, int pcr);
175 void ima_free_template_entry(struct ima_template_entry *entry);
176 const char *ima_d_path(const struct path *path, char **pathbuf);
177 
178 /* IMA policy related functions */
179 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
180                      int flags, int *pcr);
181 void ima_init_policy(void);
182 void ima_update_policy(void);
183 void ima_update_policy_flag(void);
184 ssize_t ima_parse_add_rule(char *);
185 void ima_delete_rules(void);
186 int ima_check_policy(void);
187 void *ima_policy_start(struct seq_file *m, loff_t *pos);
188 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
189 void ima_policy_stop(struct seq_file *m, void *v);
190 int ima_policy_show(struct seq_file *m, void *v);
191 
192 /* Appraise integrity measurements */
193 #define IMA_APPRAISE_ENFORCE    0x01
194 #define IMA_APPRAISE_FIX        0x02
195 #define IMA_APPRAISE_LOG        0x04
196 #define IMA_APPRAISE_MODULES    0x08
197 #define IMA_APPRAISE_FIRMWARE   0x10
198 #define IMA_APPRAISE_POLICY     0x20
199 
200 #ifdef CONFIG_IMA_APPRAISE
201 int ima_appraise_measurement(enum ima_hooks func,
202                              struct integrity_iint_cache *iint,
203                              struct file *file, const unsigned char *filename,
204                              struct evm_ima_xattr_data *xattr_value,
205                              int xattr_len, int opened);
206 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
207 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
208 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
209                                            enum ima_hooks func);
210 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
211                                  int xattr_len);
212 int ima_read_xattr(struct dentry *dentry,
213                    struct evm_ima_xattr_data **xattr_value);
214 
215 #else
216 static inline int ima_appraise_measurement(enum ima_hooks func,
217                                            struct integrity_iint_cache *iint,
218                                            struct file *file,
219                                            const unsigned char *filename,
220                                            struct evm_ima_xattr_data *xattr_value,
221                                            int xattr_len, int opened)
222 {
223         return INTEGRITY_UNKNOWN;
224 }
225 
226 static inline int ima_must_appraise(struct inode *inode, int mask,
227                                     enum ima_hooks func)
228 {
229         return 0;
230 }
231 
232 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
233                                     struct file *file)
234 {
235 }
236 
237 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
238                                                          *iint,
239                                                          enum ima_hooks func)
240 {
241         return INTEGRITY_UNKNOWN;
242 }
243 
244 static inline enum hash_algo
245 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
246 {
247         return ima_hash_algo;
248 }
249 
250 static inline int ima_read_xattr(struct dentry *dentry,
251                                  struct evm_ima_xattr_data **xattr_value)
252 {
253         return 0;
254 }
255 
256 #endif
257 
258 /* LSM based policy rules require audit */
259 #ifdef CONFIG_IMA_LSM_RULES
260 
261 #define security_filter_rule_init security_audit_rule_init
262 #define security_filter_rule_match security_audit_rule_match
263 
264 #else
265 
266 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
267                                             void **lsmrule)
268 {
269         return -EINVAL;
270 }
271 
272 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
273                                              void *lsmrule,
274                                              struct audit_context *actx)
275 {
276         return -EINVAL;
277 }
278 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
279 
280 #ifdef  CONFIG_IMA_READ_POLICY
281 #define POLICY_FILE_FLAGS       (S_IWUSR | S_IRUSR)
282 #else
283 #define POLICY_FILE_FLAGS       S_IWUSR
284 #endif /* CONFIG_IMA_WRITE_POLICY */
285 
286 #endif /* __LINUX_IMA_H */
287 

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