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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 template field data definition */
 56 struct ima_field_data {
 57         u8 *data;
 58         u32 len;
 59 };
 60 
 61 /* IMA template field definition */
 62 struct ima_template_field {
 63         const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
 64         int (*field_init) (struct integrity_iint_cache *iint, struct file *file,
 65                            const unsigned char *filename,
 66                            struct evm_ima_xattr_data *xattr_value,
 67                            int xattr_len, struct ima_field_data *field_data);
 68         void (*field_show) (struct seq_file *m, enum ima_show_type show,
 69                             struct ima_field_data *field_data);
 70 };
 71 
 72 /* IMA template descriptor definition */
 73 struct ima_template_desc {
 74         char *name;
 75         char *fmt;
 76         int num_fields;
 77         struct ima_template_field **fields;
 78 };
 79 
 80 struct ima_template_entry {
 81         u8 digest[TPM_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
 82         struct ima_template_desc *template_desc; /* template descriptor */
 83         u32 template_data_len;
 84         struct ima_field_data template_data[0]; /* template related data */
 85 };
 86 
 87 struct ima_queue_entry {
 88         struct hlist_node hnext;        /* place in hash collision list */
 89         struct list_head later;         /* place in ima_measurements list */
 90         struct ima_template_entry *entry;
 91 };
 92 extern struct list_head ima_measurements;       /* list of all measurements */
 93 
 94 /* Internal IMA function definitions */
 95 int ima_init(void);
 96 int ima_fs_init(void);
 97 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
 98                            const char *op, struct inode *inode,
 99                            const unsigned char *filename);
100 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
101 int ima_calc_field_array_hash(struct ima_field_data *field_data,
102                               struct ima_template_desc *desc, int num_fields,
103                               struct ima_digest_data *hash);
104 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
105 void ima_add_violation(struct file *file, const unsigned char *filename,
106                        const char *op, const char *cause);
107 int ima_init_crypto(void);
108 void ima_putc(struct seq_file *m, void *data, int datalen);
109 void ima_print_digest(struct seq_file *m, u8 *digest, int size);
110 struct ima_template_desc *ima_template_desc_current(void);
111 int ima_init_template(void);
112 
113 /*
114  * used to protect h_table and sha_table
115  */
116 extern spinlock_t ima_queue_lock;
117 
118 struct ima_h_table {
119         atomic_long_t len;      /* number of stored measurements in the list */
120         atomic_long_t violations;
121         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
122 };
123 extern struct ima_h_table ima_htable;
124 
125 static inline unsigned long ima_hash_key(u8 *digest)
126 {
127         return hash_long(*digest, IMA_HASH_BITS);
128 }
129 
130 /* LIM API function definitions */
131 int ima_get_action(struct inode *inode, int mask, int function);
132 int ima_must_measure(struct inode *inode, int mask, int function);
133 int ima_collect_measurement(struct integrity_iint_cache *iint,
134                             struct file *file,
135                             struct evm_ima_xattr_data **xattr_value,
136                             int *xattr_len);
137 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
138                            const unsigned char *filename,
139                            struct evm_ima_xattr_data *xattr_value,
140                            int xattr_len);
141 void ima_audit_measurement(struct integrity_iint_cache *iint,
142                            const unsigned char *filename);
143 int ima_alloc_init_template(struct integrity_iint_cache *iint,
144                             struct file *file, const unsigned char *filename,
145                             struct evm_ima_xattr_data *xattr_value,
146                             int xattr_len, struct ima_template_entry **entry);
147 int ima_store_template(struct ima_template_entry *entry, int violation,
148                        struct inode *inode, const unsigned char *filename);
149 void ima_free_template_entry(struct ima_template_entry *entry);
150 const char *ima_d_path(struct path *path, char **pathbuf);
151 
152 /* IMA policy related functions */
153 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, FIRMWARE_CHECK, POST_SETATTR };
154 
155 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
156                      int flags);
157 void ima_init_policy(void);
158 void ima_update_policy(void);
159 void ima_update_policy_flag(void);
160 ssize_t ima_parse_add_rule(char *);
161 void ima_delete_rules(void);
162 
163 /* Appraise integrity measurements */
164 #define IMA_APPRAISE_ENFORCE    0x01
165 #define IMA_APPRAISE_FIX        0x02
166 #define IMA_APPRAISE_LOG        0x04
167 #define IMA_APPRAISE_MODULES    0x08
168 #define IMA_APPRAISE_FIRMWARE   0x10
169 
170 #ifdef CONFIG_IMA_APPRAISE
171 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
172                              struct file *file, const unsigned char *filename,
173                              struct evm_ima_xattr_data *xattr_value,
174                              int xattr_len, int opened);
175 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
176 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
177 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
178                                            int func);
179 void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
180                        struct ima_digest_data *hash);
181 int ima_read_xattr(struct dentry *dentry,
182                    struct evm_ima_xattr_data **xattr_value);
183 
184 #else
185 static inline int ima_appraise_measurement(int func,
186                                            struct integrity_iint_cache *iint,
187                                            struct file *file,
188                                            const unsigned char *filename,
189                                            struct evm_ima_xattr_data *xattr_value,
190                                            int xattr_len, int opened)
191 {
192         return INTEGRITY_UNKNOWN;
193 }
194 
195 static inline int ima_must_appraise(struct inode *inode, int mask,
196                                     enum ima_hooks func)
197 {
198         return 0;
199 }
200 
201 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
202                                     struct file *file)
203 {
204 }
205 
206 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
207                                                          *iint, int func)
208 {
209         return INTEGRITY_UNKNOWN;
210 }
211 
212 static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
213                                      int xattr_len,
214                                      struct ima_digest_data *hash)
215 {
216 }
217 
218 static inline int ima_read_xattr(struct dentry *dentry,
219                                  struct evm_ima_xattr_data **xattr_value)
220 {
221         return 0;
222 }
223 
224 #endif
225 
226 /* LSM based policy rules require audit */
227 #ifdef CONFIG_IMA_LSM_RULES
228 
229 #define security_filter_rule_init security_audit_rule_init
230 #define security_filter_rule_match security_audit_rule_match
231 
232 #else
233 
234 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
235                                             void **lsmrule)
236 {
237         return -EINVAL;
238 }
239 
240 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
241                                              void *lsmrule,
242                                              struct audit_context *actx)
243 {
244         return -EINVAL;
245 }
246 #endif /* CONFIG_IMA_LSM_RULES */
247 
248 #ifdef CONFIG_IMA_TRUSTED_KEYRING
249 static inline int ima_init_keyring(const unsigned int id)
250 {
251         return integrity_init_keyring(id);
252 }
253 #else
254 static inline int ima_init_keyring(const unsigned int id)
255 {
256         return 0;
257 }
258 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
259 #endif
260 

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