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Linux/security/integrity/ima/ima.h

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  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_used_chip;
 57 extern int ima_hash_algo;
 58 extern int ima_appraise;
 59 
 60 /* IMA event related data */
 61 struct ima_event_data {
 62         struct integrity_iint_cache *iint;
 63         struct file *file;
 64         const unsigned char *filename;
 65         struct evm_ima_xattr_data *xattr_value;
 66         int xattr_len;
 67         const char *violation;
 68 };
 69 
 70 /* IMA template field data definition */
 71 struct ima_field_data {
 72         u8 *data;
 73         u32 len;
 74 };
 75 
 76 /* IMA template field definition */
 77 struct ima_template_field {
 78         const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
 79         int (*field_init)(struct ima_event_data *event_data,
 80                           struct ima_field_data *field_data);
 81         void (*field_show)(struct seq_file *m, enum ima_show_type show,
 82                            struct ima_field_data *field_data);
 83 };
 84 
 85 /* IMA template descriptor definition */
 86 struct ima_template_desc {
 87         struct list_head list;
 88         char *name;
 89         char *fmt;
 90         int num_fields;
 91         struct ima_template_field **fields;
 92 };
 93 
 94 struct ima_template_entry {
 95         int pcr;
 96         u8 digest[TPM_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
 97         struct ima_template_desc *template_desc; /* template descriptor */
 98         u32 template_data_len;
 99         struct ima_field_data template_data[0]; /* template related data */
100 };
101 
102 struct ima_queue_entry {
103         struct hlist_node hnext;        /* place in hash collision list */
104         struct list_head later;         /* place in ima_measurements list */
105         struct ima_template_entry *entry;
106 };
107 extern struct list_head ima_measurements;       /* list of all measurements */
108 
109 /* Some details preceding the binary serialized measurement list */
110 struct ima_kexec_hdr {
111         u16 version;
112         u16 _reserved0;
113         u32 _reserved1;
114         u64 buffer_size;
115         u64 count;
116 };
117 
118 #ifdef CONFIG_HAVE_IMA_KEXEC
119 void ima_load_kexec_buffer(void);
120 #else
121 static inline void ima_load_kexec_buffer(void) {}
122 #endif /* CONFIG_HAVE_IMA_KEXEC */
123 
124 /*
125  * The default binary_runtime_measurements list format is defined as the
126  * platform native format.  The canonical format is defined as little-endian.
127  */
128 extern bool ima_canonical_fmt;
129 
130 /* Internal IMA function definitions */
131 int ima_init(void);
132 int ima_fs_init(void);
133 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
134                            const char *op, struct inode *inode,
135                            const unsigned char *filename);
136 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
137 int ima_calc_buffer_hash(const void *buf, loff_t len,
138                          struct ima_digest_data *hash);
139 int ima_calc_field_array_hash(struct ima_field_data *field_data,
140                               struct ima_template_desc *desc, int num_fields,
141                               struct ima_digest_data *hash);
142 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
143 void ima_add_violation(struct file *file, const unsigned char *filename,
144                        struct integrity_iint_cache *iint,
145                        const char *op, const char *cause);
146 int ima_init_crypto(void);
147 void ima_putc(struct seq_file *m, void *data, int datalen);
148 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
149 struct ima_template_desc *ima_template_desc_current(void);
150 int ima_restore_measurement_entry(struct ima_template_entry *entry);
151 int ima_restore_measurement_list(loff_t bufsize, void *buf);
152 int ima_measurements_show(struct seq_file *m, void *v);
153 unsigned long ima_get_binary_runtime_size(void);
154 int ima_init_template(void);
155 void ima_init_template_list(void);
156 
157 /*
158  * used to protect h_table and sha_table
159  */
160 extern spinlock_t ima_queue_lock;
161 
162 struct ima_h_table {
163         atomic_long_t len;      /* number of stored measurements in the list */
164         atomic_long_t violations;
165         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
166 };
167 extern struct ima_h_table ima_htable;
168 
169 static inline unsigned long ima_hash_key(u8 *digest)
170 {
171         return hash_long(*digest, IMA_HASH_BITS);
172 }
173 
174 #define __ima_hooks(hook)               \
175         hook(NONE)                      \
176         hook(FILE_CHECK)                \
177         hook(MMAP_CHECK)                \
178         hook(BPRM_CHECK)                \
179         hook(CREDS_CHECK)               \
180         hook(POST_SETATTR)              \
181         hook(MODULE_CHECK)              \
182         hook(FIRMWARE_CHECK)            \
183         hook(KEXEC_KERNEL_CHECK)        \
184         hook(KEXEC_INITRAMFS_CHECK)     \
185         hook(POLICY_CHECK)              \
186         hook(MAX_CHECK)
187 #define __ima_hook_enumify(ENUM)        ENUM,
188 
189 enum ima_hooks {
190         __ima_hooks(__ima_hook_enumify)
191 };
192 
193 /* LIM API function definitions */
194 int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
195                    int mask, enum ima_hooks func, int *pcr);
196 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
197 int ima_collect_measurement(struct integrity_iint_cache *iint,
198                             struct file *file, void *buf, loff_t size,
199                             enum hash_algo algo);
200 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
201                            const unsigned char *filename,
202                            struct evm_ima_xattr_data *xattr_value,
203                            int xattr_len, int pcr);
204 void ima_audit_measurement(struct integrity_iint_cache *iint,
205                            const unsigned char *filename);
206 int ima_alloc_init_template(struct ima_event_data *event_data,
207                             struct ima_template_entry **entry);
208 int ima_store_template(struct ima_template_entry *entry, int violation,
209                        struct inode *inode,
210                        const unsigned char *filename, int pcr);
211 void ima_free_template_entry(struct ima_template_entry *entry);
212 const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
213 
214 /* IMA policy related functions */
215 int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
216                      enum ima_hooks func, int mask, int flags, int *pcr);
217 void ima_init_policy(void);
218 void ima_update_policy(void);
219 void ima_update_policy_flag(void);
220 ssize_t ima_parse_add_rule(char *);
221 void ima_delete_rules(void);
222 int ima_check_policy(void);
223 void *ima_policy_start(struct seq_file *m, loff_t *pos);
224 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
225 void ima_policy_stop(struct seq_file *m, void *v);
226 int ima_policy_show(struct seq_file *m, void *v);
227 
228 /* Appraise integrity measurements */
229 #define IMA_APPRAISE_ENFORCE    0x01
230 #define IMA_APPRAISE_FIX        0x02
231 #define IMA_APPRAISE_LOG        0x04
232 #define IMA_APPRAISE_MODULES    0x08
233 #define IMA_APPRAISE_FIRMWARE   0x10
234 #define IMA_APPRAISE_POLICY     0x20
235 
236 #ifdef CONFIG_IMA_APPRAISE
237 int ima_appraise_measurement(enum ima_hooks func,
238                              struct integrity_iint_cache *iint,
239                              struct file *file, const unsigned char *filename,
240                              struct evm_ima_xattr_data *xattr_value,
241                              int xattr_len, int opened);
242 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
243 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
244 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
245                                            enum ima_hooks func);
246 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
247                                  int xattr_len);
248 int ima_read_xattr(struct dentry *dentry,
249                    struct evm_ima_xattr_data **xattr_value);
250 
251 #else
252 static inline int ima_appraise_measurement(enum ima_hooks func,
253                                            struct integrity_iint_cache *iint,
254                                            struct file *file,
255                                            const unsigned char *filename,
256                                            struct evm_ima_xattr_data *xattr_value,
257                                            int xattr_len, int opened)
258 {
259         return INTEGRITY_UNKNOWN;
260 }
261 
262 static inline int ima_must_appraise(struct inode *inode, int mask,
263                                     enum ima_hooks func)
264 {
265         return 0;
266 }
267 
268 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
269                                     struct file *file)
270 {
271 }
272 
273 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
274                                                          *iint,
275                                                          enum ima_hooks func)
276 {
277         return INTEGRITY_UNKNOWN;
278 }
279 
280 static inline enum hash_algo
281 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
282 {
283         return ima_hash_algo;
284 }
285 
286 static inline int ima_read_xattr(struct dentry *dentry,
287                                  struct evm_ima_xattr_data **xattr_value)
288 {
289         return 0;
290 }
291 
292 #endif /* CONFIG_IMA_APPRAISE */
293 
294 /* LSM based policy rules require audit */
295 #ifdef CONFIG_IMA_LSM_RULES
296 
297 #define security_filter_rule_init security_audit_rule_init
298 #define security_filter_rule_match security_audit_rule_match
299 
300 #else
301 
302 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
303                                             void **lsmrule)
304 {
305         return -EINVAL;
306 }
307 
308 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
309                                              void *lsmrule,
310                                              struct audit_context *actx)
311 {
312         return -EINVAL;
313 }
314 #endif /* CONFIG_IMA_LSM_RULES */
315 
316 #ifdef  CONFIG_IMA_READ_POLICY
317 #define POLICY_FILE_FLAGS       (S_IWUSR | S_IRUSR)
318 #else
319 #define POLICY_FILE_FLAGS       S_IWUSR
320 #endif /* CONFIG_IMA_READ_POLICY */
321 
322 #endif /* __LINUX_IMA_H */
323 

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