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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 #ifdef CONFIG_HAVE_IMA_KEXEC
 32 #include <asm/ima.h>
 33 #endif
 34 
 35 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 36                      IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 37 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
 38 
 39 /* digest size for IMA, fits SHA1 or MD5 */
 40 #define IMA_DIGEST_SIZE         SHA1_DIGEST_SIZE
 41 #define IMA_EVENT_NAME_LEN_MAX  255
 42 
 43 #define IMA_HASH_BITS 9
 44 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
 45 
 46 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN   16
 47 #define IMA_TEMPLATE_NUM_FIELDS_MAX     15
 48 
 49 #define IMA_TEMPLATE_IMA_NAME "ima"
 50 #define IMA_TEMPLATE_IMA_FMT "d|n"
 51 
 52 /* current content of the policy */
 53 extern int ima_policy_flag;
 54 
 55 /* set during initialization */
 56 extern int ima_initialized;
 57 extern int ima_used_chip;
 58 extern int ima_hash_algo;
 59 extern int ima_appraise;
 60 
 61 /* IMA event related data */
 62 struct ima_event_data {
 63         struct integrity_iint_cache *iint;
 64         struct file *file;
 65         const unsigned char *filename;
 66         struct evm_ima_xattr_data *xattr_value;
 67         int xattr_len;
 68         const char *violation;
 69 };
 70 
 71 /* IMA template field data definition */
 72 struct ima_field_data {
 73         u8 *data;
 74         u32 len;
 75 };
 76 
 77 /* IMA template field definition */
 78 struct ima_template_field {
 79         const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
 80         int (*field_init)(struct ima_event_data *event_data,
 81                           struct ima_field_data *field_data);
 82         void (*field_show)(struct seq_file *m, enum ima_show_type show,
 83                            struct ima_field_data *field_data);
 84 };
 85 
 86 /* IMA template descriptor definition */
 87 struct ima_template_desc {
 88         struct list_head list;
 89         char *name;
 90         char *fmt;
 91         int num_fields;
 92         struct ima_template_field **fields;
 93 };
 94 
 95 struct ima_template_entry {
 96         int pcr;
 97         u8 digest[TPM_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
 98         struct ima_template_desc *template_desc; /* template descriptor */
 99         u32 template_data_len;
100         struct ima_field_data template_data[0]; /* template related data */
101 };
102 
103 struct ima_queue_entry {
104         struct hlist_node hnext;        /* place in hash collision list */
105         struct list_head later;         /* place in ima_measurements list */
106         struct ima_template_entry *entry;
107 };
108 extern struct list_head ima_measurements;       /* list of all measurements */
109 
110 /* Some details preceding the binary serialized measurement list */
111 struct ima_kexec_hdr {
112         u16 version;
113         u16 _reserved0;
114         u32 _reserved1;
115         u64 buffer_size;
116         u64 count;
117 };
118 
119 #ifdef CONFIG_HAVE_IMA_KEXEC
120 void ima_load_kexec_buffer(void);
121 #else
122 static inline void ima_load_kexec_buffer(void) {}
123 #endif /* CONFIG_HAVE_IMA_KEXEC */
124 
125 /*
126  * The default binary_runtime_measurements list format is defined as the
127  * platform native format.  The canonical format is defined as little-endian.
128  */
129 extern bool ima_canonical_fmt;
130 
131 /* Internal IMA function definitions */
132 int ima_init(void);
133 int ima_fs_init(void);
134 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
135                            const char *op, struct inode *inode,
136                            const unsigned char *filename);
137 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
138 int ima_calc_buffer_hash(const void *buf, loff_t len,
139                          struct ima_digest_data *hash);
140 int ima_calc_field_array_hash(struct ima_field_data *field_data,
141                               struct ima_template_desc *desc, int num_fields,
142                               struct ima_digest_data *hash);
143 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
144 void ima_add_violation(struct file *file, const unsigned char *filename,
145                        struct integrity_iint_cache *iint,
146                        const char *op, const char *cause);
147 int ima_init_crypto(void);
148 void ima_putc(struct seq_file *m, void *data, int datalen);
149 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
150 struct ima_template_desc *ima_template_desc_current(void);
151 int ima_restore_measurement_entry(struct ima_template_entry *entry);
152 int ima_restore_measurement_list(loff_t bufsize, void *buf);
153 int ima_measurements_show(struct seq_file *m, void *v);
154 unsigned long ima_get_binary_runtime_size(void);
155 int ima_init_template(void);
156 void ima_init_template_list(void);
157 
158 /*
159  * used to protect h_table and sha_table
160  */
161 extern spinlock_t ima_queue_lock;
162 
163 struct ima_h_table {
164         atomic_long_t len;      /* number of stored measurements in the list */
165         atomic_long_t violations;
166         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
167 };
168 extern struct ima_h_table ima_htable;
169 
170 static inline unsigned long ima_hash_key(u8 *digest)
171 {
172         return hash_long(*digest, IMA_HASH_BITS);
173 }
174 
175 enum ima_hooks {
176         FILE_CHECK = 1,
177         MMAP_CHECK,
178         BPRM_CHECK,
179         POST_SETATTR,
180         MODULE_CHECK,
181         FIRMWARE_CHECK,
182         KEXEC_KERNEL_CHECK,
183         KEXEC_INITRAMFS_CHECK,
184         POLICY_CHECK,
185         MAX_CHECK
186 };
187 
188 /* LIM API function definitions */
189 int ima_get_action(struct inode *inode, int mask,
190                    enum ima_hooks func, int *pcr);
191 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
192 int ima_collect_measurement(struct integrity_iint_cache *iint,
193                             struct file *file, void *buf, loff_t size,
194                             enum hash_algo algo);
195 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
196                            const unsigned char *filename,
197                            struct evm_ima_xattr_data *xattr_value,
198                            int xattr_len, int pcr);
199 void ima_audit_measurement(struct integrity_iint_cache *iint,
200                            const unsigned char *filename);
201 int ima_alloc_init_template(struct ima_event_data *event_data,
202                             struct ima_template_entry **entry);
203 int ima_store_template(struct ima_template_entry *entry, int violation,
204                        struct inode *inode,
205                        const unsigned char *filename, int pcr);
206 void ima_free_template_entry(struct ima_template_entry *entry);
207 const char *ima_d_path(const struct path *path, char **pathbuf);
208 
209 /* IMA policy related functions */
210 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
211                      int flags, int *pcr);
212 void ima_init_policy(void);
213 void ima_update_policy(void);
214 void ima_update_policy_flag(void);
215 ssize_t ima_parse_add_rule(char *);
216 void ima_delete_rules(void);
217 int ima_check_policy(void);
218 void *ima_policy_start(struct seq_file *m, loff_t *pos);
219 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
220 void ima_policy_stop(struct seq_file *m, void *v);
221 int ima_policy_show(struct seq_file *m, void *v);
222 
223 /* Appraise integrity measurements */
224 #define IMA_APPRAISE_ENFORCE    0x01
225 #define IMA_APPRAISE_FIX        0x02
226 #define IMA_APPRAISE_LOG        0x04
227 #define IMA_APPRAISE_MODULES    0x08
228 #define IMA_APPRAISE_FIRMWARE   0x10
229 #define IMA_APPRAISE_POLICY     0x20
230 
231 #ifdef CONFIG_IMA_APPRAISE
232 int ima_appraise_measurement(enum ima_hooks func,
233                              struct integrity_iint_cache *iint,
234                              struct file *file, const unsigned char *filename,
235                              struct evm_ima_xattr_data *xattr_value,
236                              int xattr_len, int opened);
237 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
238 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
239 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
240                                            enum ima_hooks func);
241 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
242                                  int xattr_len);
243 int ima_read_xattr(struct dentry *dentry,
244                    struct evm_ima_xattr_data **xattr_value);
245 
246 #else
247 static inline int ima_appraise_measurement(enum ima_hooks func,
248                                            struct integrity_iint_cache *iint,
249                                            struct file *file,
250                                            const unsigned char *filename,
251                                            struct evm_ima_xattr_data *xattr_value,
252                                            int xattr_len, int opened)
253 {
254         return INTEGRITY_UNKNOWN;
255 }
256 
257 static inline int ima_must_appraise(struct inode *inode, int mask,
258                                     enum ima_hooks func)
259 {
260         return 0;
261 }
262 
263 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
264                                     struct file *file)
265 {
266 }
267 
268 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
269                                                          *iint,
270                                                          enum ima_hooks func)
271 {
272         return INTEGRITY_UNKNOWN;
273 }
274 
275 static inline enum hash_algo
276 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
277 {
278         return ima_hash_algo;
279 }
280 
281 static inline int ima_read_xattr(struct dentry *dentry,
282                                  struct evm_ima_xattr_data **xattr_value)
283 {
284         return 0;
285 }
286 
287 #endif
288 
289 /* LSM based policy rules require audit */
290 #ifdef CONFIG_IMA_LSM_RULES
291 
292 #define security_filter_rule_init security_audit_rule_init
293 #define security_filter_rule_match security_audit_rule_match
294 
295 #else
296 
297 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
298                                             void **lsmrule)
299 {
300         return -EINVAL;
301 }
302 
303 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
304                                              void *lsmrule,
305                                              struct audit_context *actx)
306 {
307         return -EINVAL;
308 }
309 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
310 
311 #ifdef  CONFIG_IMA_READ_POLICY
312 #define POLICY_FILE_FLAGS       (S_IWUSR | S_IRUSR)
313 #else
314 #define POLICY_FILE_FLAGS       S_IWUSR
315 #endif /* CONFIG_IMA_WRITE_POLICY */
316 
317 #endif /* __LINUX_IMA_H */
318 

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