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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/security.h>
 23 #include <linux/hash.h>
 24 #include <linux/tpm.h>
 25 #include <linux/audit.h>
 26 
 27 #include "../integrity.h"
 28 
 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 };
 32 
 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
 36 
 37 #define IMA_HASH_BITS 9
 38 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
 39 
 40 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN   16
 41 #define IMA_TEMPLATE_NUM_FIELDS_MAX     15
 42 
 43 #define IMA_TEMPLATE_IMA_NAME "ima"
 44 #define IMA_TEMPLATE_IMA_FMT "d|n"
 45 
 46 /* current content of the policy */
 47 extern int ima_policy_flag;
 48 
 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;
 54 
 55 /* IMA event related data */
 56 struct ima_event_data {
 57         struct integrity_iint_cache *iint;
 58         struct file *file;
 59         const unsigned char *filename;
 60         struct evm_ima_xattr_data *xattr_value;
 61         int xattr_len;
 62         const char *violation;
 63 };
 64 
 65 /* IMA template field data definition */
 66 struct ima_field_data {
 67         u8 *data;
 68         u32 len;
 69 };
 70 
 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);
 78 };
 79 
 80 /* IMA template descriptor definition */
 81 struct ima_template_desc {
 82         char *name;
 83         char *fmt;
 84         int num_fields;
 85         struct ima_template_field **fields;
 86 };
 87 
 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 */
 93 };
 94 
 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;
 99 };
100 extern struct list_head ima_measurements;       /* list of all measurements */
101 
102 /* Internal IMA function definitions */
103 int ima_init(void);
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);
121 
122 /*
123  * used to protect h_table and sha_table
124  */
125 extern spinlock_t ima_queue_lock;
126 
127 struct ima_h_table {
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];
131 };
132 extern struct ima_h_table ima_htable;
133 
134 static inline unsigned long ima_hash_key(u8 *digest)
135 {
136         return hash_long(*digest, IMA_HASH_BITS);
137 }
138 
139 /* LIM API function definitions */
140 int ima_get_action(struct inode *inode, int mask, int function);
141 int ima_must_measure(struct inode *inode, int mask, int function);
142 int ima_collect_measurement(struct integrity_iint_cache *iint,
143                             struct file *file,
144                             struct evm_ima_xattr_data **xattr_value,
145                             int *xattr_len);
146 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
147                            const unsigned char *filename,
148                            struct evm_ima_xattr_data *xattr_value,
149                            int xattr_len);
150 void ima_audit_measurement(struct integrity_iint_cache *iint,
151                            const unsigned char *filename);
152 int ima_alloc_init_template(struct ima_event_data *event_data,
153                             struct ima_template_entry **entry);
154 int ima_store_template(struct ima_template_entry *entry, int violation,
155                        struct inode *inode, const unsigned char *filename);
156 void ima_free_template_entry(struct ima_template_entry *entry);
157 const char *ima_d_path(struct path *path, char **pathbuf);
158 
159 /* IMA policy related functions */
160 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, FIRMWARE_CHECK, POST_SETATTR };
161 
162 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
163                      int flags);
164 void ima_init_policy(void);
165 void ima_update_policy(void);
166 void ima_update_policy_flag(void);
167 ssize_t ima_parse_add_rule(char *);
168 void ima_delete_rules(void);
169 int ima_check_policy(void);
170 void *ima_policy_start(struct seq_file *m, loff_t *pos);
171 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
172 void ima_policy_stop(struct seq_file *m, void *v);
173 int ima_policy_show(struct seq_file *m, void *v);
174 
175 /* Appraise integrity measurements */
176 #define IMA_APPRAISE_ENFORCE    0x01
177 #define IMA_APPRAISE_FIX        0x02
178 #define IMA_APPRAISE_LOG        0x04
179 #define IMA_APPRAISE_MODULES    0x08
180 #define IMA_APPRAISE_FIRMWARE   0x10
181 
182 #ifdef CONFIG_IMA_APPRAISE
183 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
184                              struct file *file, const unsigned char *filename,
185                              struct evm_ima_xattr_data *xattr_value,
186                              int xattr_len, int opened);
187 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
188 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
189 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
190                                            int func);
191 void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
192                        struct ima_digest_data *hash);
193 int ima_read_xattr(struct dentry *dentry,
194                    struct evm_ima_xattr_data **xattr_value);
195 
196 #else
197 static inline int ima_appraise_measurement(int func,
198                                            struct integrity_iint_cache *iint,
199                                            struct file *file,
200                                            const unsigned char *filename,
201                                            struct evm_ima_xattr_data *xattr_value,
202                                            int xattr_len, int opened)
203 {
204         return INTEGRITY_UNKNOWN;
205 }
206 
207 static inline int ima_must_appraise(struct inode *inode, int mask,
208                                     enum ima_hooks func)
209 {
210         return 0;
211 }
212 
213 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
214                                     struct file *file)
215 {
216 }
217 
218 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
219                                                          *iint, int func)
220 {
221         return INTEGRITY_UNKNOWN;
222 }
223 
224 static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
225                                      int xattr_len,
226                                      struct ima_digest_data *hash)
227 {
228 }
229 
230 static inline int ima_read_xattr(struct dentry *dentry,
231                                  struct evm_ima_xattr_data **xattr_value)
232 {
233         return 0;
234 }
235 
236 #endif
237 
238 /* LSM based policy rules require audit */
239 #ifdef CONFIG_IMA_LSM_RULES
240 
241 #define security_filter_rule_init security_audit_rule_init
242 #define security_filter_rule_match security_audit_rule_match
243 
244 #else
245 
246 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
247                                             void **lsmrule)
248 {
249         return -EINVAL;
250 }
251 
252 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
253                                              void *lsmrule,
254                                              struct audit_context *actx)
255 {
256         return -EINVAL;
257 }
258 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
259 
260 #ifdef  CONFIG_IMA_READ_POLICY
261 #define POLICY_FILE_FLAGS       (S_IWUSR | S_IRUSR)
262 #else
263 #define POLICY_FILE_FLAGS       S_IWUSR
264 #endif /* CONFIG_IMA_WRITE_POLICY */
265 
266 #endif /* __LINUX_IMA_H */
267 

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