164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/*
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* Copyright (C) 2005,2006,2007,2008 IBM Corporation
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*
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* Authors:
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* Reiner Sailer <sailer@watson.ibm.com>
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* Mimi Zohar <zohar@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* File: ima.h
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* internal Integrity Measurement Architecture (IMA) definitions
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*/
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#ifndef __LINUX_IMA_H
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#define __LINUX_IMA_H
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/security.h>
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#include <linux/hash.h>
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#include <linux/tpm.h>
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#include <linux/audit.h>
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enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
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enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
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/* digest size for IMA, fits SHA1 or MD5 */
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#define IMA_DIGEST_SIZE 20
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#define IMA_EVENT_NAME_LEN_MAX 255
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#define IMA_HASH_BITS 9
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#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
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/* set during initialization */
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extern int iint_initialized;
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extern int ima_initialized;
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extern int ima_used_chip;
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extern char *ima_hash;
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/* IMA inode template definition */
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struct ima_template_data {
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u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
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char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
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};
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struct ima_template_entry {
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u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
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const char *template_name;
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int template_len;
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struct ima_template_data template;
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};
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struct ima_queue_entry {
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struct hlist_node hnext; /* place in hash collision list */
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struct list_head later; /* place in ima_measurements list */
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struct ima_template_entry *entry;
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};
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extern struct list_head ima_measurements; /* list of all measurements */
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/* declarations */
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void integrity_audit_msg(int audit_msgno, struct inode *inode,
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const unsigned char *fname, const char *op,
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const char *cause, int result, int info);
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/* Internal IMA function definitions */
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int ima_init(void);
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void ima_cleanup(void);
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int ima_fs_init(void);
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void ima_fs_cleanup(void);
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int ima_add_template_entry(struct ima_template_entry *entry, int violation,
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const char *op, struct inode *inode);
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int ima_calc_hash(struct file *file, char *digest);
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int ima_calc_template_hash(int template_len, void *template, char *digest);
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int ima_calc_boot_aggregate(char *digest);
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void ima_add_violation(struct inode *inode, const unsigned char *filename,
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const char *op, const char *cause);
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/*
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* used to protect h_table and sha_table
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*/
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extern spinlock_t ima_queue_lock;
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struct ima_h_table {
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atomic_long_t len; /* number of stored measurements in the list */
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atomic_long_t violations;
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struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
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};
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extern struct ima_h_table ima_htable;
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static inline unsigned long ima_hash_key(u8 *digest)
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{
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return hash_long(*digest, IMA_HASH_BITS);
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}
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/* iint cache flags */
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#define IMA_MEASURED 1
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/* integrity data associated with an inode */
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struct ima_iint_cache {
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u64 version; /* track inode changes */
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unsigned long flags;
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u8 digest[IMA_DIGEST_SIZE];
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struct mutex mutex; /* protects: version, flags, digest */
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long readcount; /* measured files readcount */
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long writecount; /* measured files writecount */
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long opencount; /* opens reference count */
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struct kref refcount; /* ima_iint_cache reference count */
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struct rcu_head rcu;
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};
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/* LIM API function definitions */
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int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
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int mask, int function);
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int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
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void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
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const unsigned char *filename);
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int ima_store_template(struct ima_template_entry *entry, int violation,
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struct inode *inode);
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void ima_template_show(struct seq_file *m, void *e,
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enum ima_show_type show);
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/* radix tree calls to lookup, insert, delete
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* integrity data associated with an inode.
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*/
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struct ima_iint_cache *ima_iint_insert(struct inode *inode);
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struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
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void iint_free(struct kref *kref);
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void iint_rcu_free(struct rcu_head *rcu);
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/* IMA policy related functions */
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enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
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int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
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void ima_init_policy(void);
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void ima_update_policy(void);
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ssize_t ima_parse_add_rule(char *);
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void ima_delete_rules(void);
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/* LSM based policy rules require audit */
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#ifdef CONFIG_IMA_LSM_RULES
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#define security_filter_rule_init security_audit_rule_init
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#define security_filter_rule_match security_audit_rule_match
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#else
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static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
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void **lsmrule)
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{
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return -EINVAL;
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}
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static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
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void *lsmrule,
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struct audit_context *actx)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_IMA_LSM_RULES */
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#endif
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