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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/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_ASCII };
 30 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
 31 
 32 /* digest size for IMA, fits SHA1 or MD5 */
 33 #define IMA_DIGEST_SIZE         SHA1_DIGEST_SIZE
 34 #define IMA_EVENT_NAME_LEN_MAX  255
 35 
 36 #define IMA_HASH_BITS 9
 37 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
 38 
 39 /* set during initialization */
 40 extern int ima_initialized;
 41 extern int ima_used_chip;
 42 extern char *ima_hash;
 43 extern int ima_appraise;
 44 
 45 /* IMA inode template definition */
 46 struct ima_template_data {
 47         u8 digest[IMA_DIGEST_SIZE];     /* sha1/md5 measurement hash */
 48         char file_name[IMA_EVENT_NAME_LEN_MAX + 1];     /* name + \0 */
 49 };
 50 
 51 struct ima_template_entry {
 52         u8 digest[IMA_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
 53         const char *template_name;
 54         int template_len;
 55         struct ima_template_data template;
 56 };
 57 
 58 struct ima_queue_entry {
 59         struct hlist_node hnext;        /* place in hash collision list */
 60         struct list_head later;         /* place in ima_measurements list */
 61         struct ima_template_entry *entry;
 62 };
 63 extern struct list_head ima_measurements;       /* list of all measurements */
 64 
 65 #ifdef CONFIG_IMA_AUDIT
 66 /* declarations */
 67 void integrity_audit_msg(int audit_msgno, struct inode *inode,
 68                          const unsigned char *fname, const char *op,
 69                          const char *cause, int result, int info);
 70 #else
 71 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
 72                                        const unsigned char *fname,
 73                                        const char *op, const char *cause,
 74                                        int result, int info)
 75 {
 76 }
 77 #endif
 78 
 79 /* Internal IMA function definitions */
 80 int ima_init(void);
 81 void ima_cleanup(void);
 82 int ima_fs_init(void);
 83 void ima_fs_cleanup(void);
 84 int ima_inode_alloc(struct inode *inode);
 85 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
 86                            const char *op, struct inode *inode);
 87 int ima_calc_file_hash(struct file *file, char *digest);
 88 int ima_calc_buffer_hash(const void *data, int len, char *digest);
 89 int ima_calc_boot_aggregate(char *digest);
 90 void ima_add_violation(struct inode *inode, const unsigned char *filename,
 91                        const char *op, const char *cause);
 92 int ima_init_crypto(void);
 93 
 94 /*
 95  * used to protect h_table and sha_table
 96  */
 97 extern spinlock_t ima_queue_lock;
 98 
 99 struct ima_h_table {
100         atomic_long_t len;      /* number of stored measurements in the list */
101         atomic_long_t violations;
102         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
103 };
104 extern struct ima_h_table ima_htable;
105 
106 static inline unsigned long ima_hash_key(u8 *digest)
107 {
108         return hash_long(*digest, IMA_HASH_BITS);
109 }
110 
111 /* LIM API function definitions */
112 int ima_get_action(struct inode *inode, int mask, int function);
113 int ima_must_measure(struct inode *inode, int mask, int function);
114 int ima_collect_measurement(struct integrity_iint_cache *iint,
115                             struct file *file);
116 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
117                            const unsigned char *filename);
118 void ima_audit_measurement(struct integrity_iint_cache *iint,
119                            const unsigned char *filename);
120 int ima_store_template(struct ima_template_entry *entry, int violation,
121                        struct inode *inode);
122 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
123 const char *ima_d_path(struct path *path, char **pathbuf);
124 
125 /* rbtree tree calls to lookup, insert, delete
126  * integrity data associated with an inode.
127  */
128 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
129 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
130 
131 /* IMA policy related functions */
132 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR };
133 
134 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
135                      int flags);
136 void ima_init_policy(void);
137 void ima_update_policy(void);
138 ssize_t ima_parse_add_rule(char *);
139 void ima_delete_rules(void);
140 
141 /* Appraise integrity measurements */
142 #define IMA_APPRAISE_ENFORCE    0x01
143 #define IMA_APPRAISE_FIX        0x02
144 #define IMA_APPRAISE_MODULES    0x04
145 
146 #ifdef CONFIG_IMA_APPRAISE
147 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
148                              struct file *file, const unsigned char *filename);
149 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
150 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
151 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
152                                            int func);
153 
154 #else
155 static inline int ima_appraise_measurement(int func,
156                                            struct integrity_iint_cache *iint,
157                                            struct file *file,
158                                            const unsigned char *filename)
159 {
160         return INTEGRITY_UNKNOWN;
161 }
162 
163 static inline int ima_must_appraise(struct inode *inode, int mask,
164                                     enum ima_hooks func)
165 {
166         return 0;
167 }
168 
169 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
170                                     struct file *file)
171 {
172 }
173 
174 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
175                                                          *iint, int func)
176 {
177         return INTEGRITY_UNKNOWN;
178 }
179 #endif
180 
181 /* LSM based policy rules require audit */
182 #ifdef CONFIG_IMA_LSM_RULES
183 
184 #define security_filter_rule_init security_audit_rule_init
185 #define security_filter_rule_match security_audit_rule_match
186 
187 #else
188 
189 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
190                                             void **lsmrule)
191 {
192         return -EINVAL;
193 }
194 
195 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
196                                              void *lsmrule,
197                                              struct audit_context *actx)
198 {
199         return -EINVAL;
200 }
201 #endif /* CONFIG_IMA_LSM_RULES */
202 #endif
203 

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