diff options
Diffstat (limited to 'security/integrity/ima/ima.h')
| -rw-r--r-- | security/integrity/ima/ima.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h new file mode 100644 index 00000000..08408bd7 --- /dev/null +++ b/security/integrity/ima/ima.h @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2005,2006,2007,2008 IBM Corporation + * + * Authors: + * Reiner Sailer <sailer@watson.ibm.com> + * Mimi Zohar <zohar@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * File: ima.h + * internal Integrity Measurement Architecture (IMA) definitions + */ + +#ifndef __LINUX_IMA_H +#define __LINUX_IMA_H + +#include <linux/types.h> +#include <linux/crypto.h> +#include <linux/security.h> +#include <linux/hash.h> +#include <linux/tpm.h> +#include <linux/audit.h> + +enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; +enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; + +/* digest size for IMA, fits SHA1 or MD5 */ +#define IMA_DIGEST_SIZE 20 +#define IMA_EVENT_NAME_LEN_MAX 255 + +#define IMA_HASH_BITS 9 +#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) + +/* set during initialization */ +extern int iint_initialized; +extern int ima_initialized; +extern int ima_used_chip; +extern char *ima_hash; + +/* IMA inode template definition */ +struct ima_template_data { + u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ + char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ +}; + +struct ima_template_entry { + u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ + const char *template_name; + int template_len; + struct ima_template_data template; +}; + +struct ima_queue_entry { + struct hlist_node hnext; /* place in hash collision list */ + struct list_head later; /* place in ima_measurements list */ + struct ima_template_entry *entry; +}; +extern struct list_head ima_measurements; /* list of all measurements */ + +/* declarations */ +void integrity_audit_msg(int audit_msgno, struct inode *inode, + const unsigned char *fname, const char *op, + const char *cause, int result, int info); + +/* Internal IMA function definitions */ +int ima_init(void); +void ima_cleanup(void); +int ima_fs_init(void); +void ima_fs_cleanup(void); +int ima_inode_alloc(struct inode *inode); +int ima_add_template_entry(struct ima_template_entry *entry, int violation, + const char *op, struct inode *inode); +int ima_calc_hash(struct file *file, char *digest); +int ima_calc_template_hash(int template_len, void *template, char *digest); +int ima_calc_boot_aggregate(char *digest); +void ima_add_violation(struct inode *inode, const unsigned char *filename, + const char *op, const char *cause); + +/* + * used to protect h_table and sha_table + */ +extern spinlock_t ima_queue_lock; + +struct ima_h_table { + atomic_long_t len; /* number of stored measurements in the list */ + atomic_long_t violations; + struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; +}; +extern struct ima_h_table ima_htable; + +static inline unsigned long ima_hash_key(u8 *digest) +{ + return hash_long(*digest, IMA_HASH_BITS); +} + +/* iint cache flags */ +#define IMA_MEASURED 0x01 + +/* integrity data associated with an inode */ +struct ima_iint_cache { + struct rb_node rb_node; /* rooted in ima_iint_tree */ + struct inode *inode; /* back pointer to inode in question */ + u64 version; /* track inode changes */ + unsigned char flags; + u8 digest[IMA_DIGEST_SIZE]; + struct mutex mutex; /* protects: version, flags, digest */ +}; + +/* LIM API function definitions */ +int ima_must_measure(struct inode *inode, int mask, int function); +int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file); +void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, + const unsigned char *filename); +int ima_store_template(struct ima_template_entry *entry, int violation, + struct inode *inode); +void ima_template_show(struct seq_file *m, void *e, + enum ima_show_type show); + +/* rbtree tree calls to lookup, insert, delete + * integrity data associated with an inode. + */ +struct ima_iint_cache *ima_iint_insert(struct inode *inode); +struct ima_iint_cache *ima_iint_find(struct inode *inode); + +/* IMA policy related functions */ +enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; + +int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); +void ima_init_policy(void); +void ima_update_policy(void); +ssize_t ima_parse_add_rule(char *); +void ima_delete_rules(void); + +/* LSM based policy rules require audit */ +#ifdef CONFIG_IMA_LSM_RULES + +#define security_filter_rule_init security_audit_rule_init +#define security_filter_rule_match security_audit_rule_match + +#else + +static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, + void **lsmrule) +{ + return -EINVAL; +} + +static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, + void *lsmrule, + struct audit_context *actx) +{ + return -EINVAL; +} +#endif /* CONFIG_IMA_LSM_RULES */ +#endif |