/* * 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> #include "../integrity.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 SHA1_DIGEST_SIZE #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 ima_initialized; extern int ima_used_chip; extern char *ima_hash; extern int ima_appraise; /* 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 */ #ifdef CONFIG_IMA_AUDIT /* 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); #else static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, const unsigned char *fname, const char *op, const char *cause, int result, int info) { } #endif /* 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); } /* LIM API function definitions */ int ima_get_action(struct inode *inode, int mask, int function); int ima_must_measure(struct inode *inode, int mask, int function); int ima_collect_measurement(struct integrity_iint_cache *iint, struct file *file); void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename); void ima_audit_measurement(struct integrity_iint_cache *iint, 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 integrity_iint_cache *integrity_iint_insert(struct inode *inode); struct integrity_iint_cache *integrity_iint_find(struct inode *inode); /* IMA policy related functions */ enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK, POST_SETATTR }; int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, int flags); void ima_init_policy(void); void ima_update_policy(void); ssize_t ima_parse_add_rule(char *); void ima_delete_rules(void); /* Appraise integrity measurements */ #define IMA_APPRAISE_ENFORCE 0x01 #define IMA_APPRAISE_FIX 0x02 #ifdef CONFIG_IMA_APPRAISE int ima_appraise_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename); int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); #else static inline int ima_appraise_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename) { return INTEGRITY_UNKNOWN; } static inline int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func) { return 0; } static inline void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file) { } #endif /* 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