13323eec9SMimi Zohar /* 23323eec9SMimi Zohar * Copyright (C) 2005,2006,2007,2008 IBM Corporation 33323eec9SMimi Zohar * 43323eec9SMimi Zohar * Authors: 53323eec9SMimi Zohar * Reiner Sailer <sailer@watson.ibm.com> 63323eec9SMimi Zohar * Mimi Zohar <zohar@us.ibm.com> 73323eec9SMimi Zohar * 83323eec9SMimi Zohar * This program is free software; you can redistribute it and/or 93323eec9SMimi Zohar * modify it under the terms of the GNU General Public License as 103323eec9SMimi Zohar * published by the Free Software Foundation, version 2 of the 113323eec9SMimi Zohar * License. 123323eec9SMimi Zohar * 133323eec9SMimi Zohar * File: ima.h 143323eec9SMimi Zohar * internal Integrity Measurement Architecture (IMA) definitions 153323eec9SMimi Zohar */ 163323eec9SMimi Zohar 173323eec9SMimi Zohar #ifndef __LINUX_IMA_H 183323eec9SMimi Zohar #define __LINUX_IMA_H 193323eec9SMimi Zohar 203323eec9SMimi Zohar #include <linux/types.h> 213323eec9SMimi Zohar #include <linux/crypto.h> 223323eec9SMimi Zohar #include <linux/security.h> 233323eec9SMimi Zohar #include <linux/hash.h> 243323eec9SMimi Zohar #include <linux/tpm.h> 253323eec9SMimi Zohar #include <linux/audit.h> 263323eec9SMimi Zohar 27f381c272SMimi Zohar #include "../integrity.h" 28f381c272SMimi Zohar 293323eec9SMimi Zohar enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; 303323eec9SMimi Zohar enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; 313323eec9SMimi Zohar 323323eec9SMimi Zohar /* digest size for IMA, fits SHA1 or MD5 */ 33f381c272SMimi Zohar #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE 343323eec9SMimi Zohar #define IMA_EVENT_NAME_LEN_MAX 255 353323eec9SMimi Zohar 363323eec9SMimi Zohar #define IMA_HASH_BITS 9 373323eec9SMimi Zohar #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) 383323eec9SMimi Zohar 39adf53a77SRoberto Sassu #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 40adf53a77SRoberto Sassu #define IMA_TEMPLATE_NUM_FIELDS_MAX 15 41adf53a77SRoberto Sassu 423ce1217dSRoberto Sassu #define IMA_TEMPLATE_IMA_NAME "ima" 433ce1217dSRoberto Sassu #define IMA_TEMPLATE_IMA_FMT "d|n" 443ce1217dSRoberto Sassu 453323eec9SMimi Zohar /* set during initialization */ 463323eec9SMimi Zohar extern int ima_initialized; 473323eec9SMimi Zohar extern int ima_used_chip; 48c7c8bb23SDmitry Kasatkin extern int ima_hash_algo; 492fe5d6deSMimi Zohar extern int ima_appraise; 503323eec9SMimi Zohar 51adf53a77SRoberto Sassu /* IMA template field data definition */ 52adf53a77SRoberto Sassu struct ima_field_data { 53adf53a77SRoberto Sassu u8 *data; 54adf53a77SRoberto Sassu u32 len; 55adf53a77SRoberto Sassu }; 56adf53a77SRoberto Sassu 57adf53a77SRoberto Sassu /* IMA template field definition */ 58adf53a77SRoberto Sassu struct ima_template_field { 59adf53a77SRoberto Sassu const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; 60adf53a77SRoberto Sassu int (*field_init) (struct integrity_iint_cache *iint, struct file *file, 61adf53a77SRoberto Sassu const unsigned char *filename, 62adf53a77SRoberto Sassu struct ima_field_data *field_data); 63adf53a77SRoberto Sassu void (*field_show) (struct seq_file *m, enum ima_show_type show, 64adf53a77SRoberto Sassu struct ima_field_data *field_data); 65adf53a77SRoberto Sassu }; 66adf53a77SRoberto Sassu 67adf53a77SRoberto Sassu /* IMA template descriptor definition */ 68adf53a77SRoberto Sassu struct ima_template_desc { 69adf53a77SRoberto Sassu char *name; 70adf53a77SRoberto Sassu char *fmt; 71adf53a77SRoberto Sassu int num_fields; 72adf53a77SRoberto Sassu struct ima_template_field **fields; 73adf53a77SRoberto Sassu }; 74adf53a77SRoberto Sassu 753323eec9SMimi Zohar struct ima_template_entry { 76140d8022SMimi Zohar u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ 77a71dc65dSRoberto Sassu struct ima_template_desc *template_desc; /* template descriptor */ 78a71dc65dSRoberto Sassu u32 template_data_len; 79a71dc65dSRoberto Sassu struct ima_field_data template_data[0]; /* template related data */ 803323eec9SMimi Zohar }; 813323eec9SMimi Zohar 823323eec9SMimi Zohar struct ima_queue_entry { 833323eec9SMimi Zohar struct hlist_node hnext; /* place in hash collision list */ 843323eec9SMimi Zohar struct list_head later; /* place in ima_measurements list */ 853323eec9SMimi Zohar struct ima_template_entry *entry; 863323eec9SMimi Zohar }; 873323eec9SMimi Zohar extern struct list_head ima_measurements; /* list of all measurements */ 883323eec9SMimi Zohar 893323eec9SMimi Zohar /* Internal IMA function definitions */ 903323eec9SMimi Zohar int ima_init(void); 91bab73937SMimi Zohar void ima_cleanup(void); 92bab73937SMimi Zohar int ima_fs_init(void); 93bab73937SMimi Zohar void ima_fs_cleanup(void); 94a178d202SEric Paris int ima_inode_alloc(struct inode *inode); 953323eec9SMimi Zohar int ima_add_template_entry(struct ima_template_entry *entry, int violation, 969803d413SRoberto Sassu const char *op, struct inode *inode, 979803d413SRoberto Sassu const unsigned char *filename); 98c7c8bb23SDmitry Kasatkin int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); 99a71dc65dSRoberto Sassu int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields, 100c7c8bb23SDmitry Kasatkin struct ima_digest_data *hash); 10109ef5435SDmitry Kasatkin int __init ima_calc_boot_aggregate(struct ima_digest_data *hash); 1027d802a22SRoberto Sassu void ima_add_violation(struct file *file, const unsigned char *filename, 1033323eec9SMimi Zohar const char *op, const char *cause); 10476bb28f6SDmitry Kasatkin int ima_init_crypto(void); 1053ce1217dSRoberto Sassu void ima_putc(struct seq_file *m, void *data, int datalen); 1063ce1217dSRoberto Sassu void ima_print_digest(struct seq_file *m, u8 *digest, int size); 107a71dc65dSRoberto Sassu struct ima_template_desc *ima_template_desc_current(void); 108a71dc65dSRoberto Sassu int ima_init_template(void); 1093323eec9SMimi Zohar 110adf53a77SRoberto Sassu int ima_init_template(void); 111adf53a77SRoberto Sassu 1123323eec9SMimi Zohar /* 1133323eec9SMimi Zohar * used to protect h_table and sha_table 1143323eec9SMimi Zohar */ 1153323eec9SMimi Zohar extern spinlock_t ima_queue_lock; 1163323eec9SMimi Zohar 1173323eec9SMimi Zohar struct ima_h_table { 1183323eec9SMimi Zohar atomic_long_t len; /* number of stored measurements in the list */ 1193323eec9SMimi Zohar atomic_long_t violations; 1203323eec9SMimi Zohar struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 1213323eec9SMimi Zohar }; 1223323eec9SMimi Zohar extern struct ima_h_table ima_htable; 1233323eec9SMimi Zohar 1243323eec9SMimi Zohar static inline unsigned long ima_hash_key(u8 *digest) 1253323eec9SMimi Zohar { 1263323eec9SMimi Zohar return hash_long(*digest, IMA_HASH_BITS); 1273323eec9SMimi Zohar } 1283323eec9SMimi Zohar 1293323eec9SMimi Zohar /* LIM API function definitions */ 130d9d300cdSDmitry Kasatkin int ima_get_action(struct inode *inode, int mask, int function); 1311adace9bSMimi Zohar int ima_must_measure(struct inode *inode, int mask, int function); 132f381c272SMimi Zohar int ima_collect_measurement(struct integrity_iint_cache *iint, 133d3634d0fSDmitry Kasatkin struct file *file, 134d3634d0fSDmitry Kasatkin struct evm_ima_xattr_data **xattr_value, 135d3634d0fSDmitry Kasatkin int *xattr_len); 136f381c272SMimi Zohar void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, 1373323eec9SMimi Zohar const unsigned char *filename); 138e7c568e0SPeter Moody void ima_audit_measurement(struct integrity_iint_cache *iint, 139e7c568e0SPeter Moody const unsigned char *filename); 1407bc5f447SRoberto Sassu int ima_alloc_init_template(struct integrity_iint_cache *iint, 1417bc5f447SRoberto Sassu struct file *file, const unsigned char *filename, 1427bc5f447SRoberto Sassu struct ima_template_entry **entry); 1433323eec9SMimi Zohar int ima_store_template(struct ima_template_entry *entry, int violation, 1449803d413SRoberto Sassu struct inode *inode, const unsigned char *filename); 145ea1046d4SDmitry Kasatkin const char *ima_d_path(struct path *path, char **pathbuf); 1463323eec9SMimi Zohar 14785491641SEric Paris /* rbtree tree calls to lookup, insert, delete 1483323eec9SMimi Zohar * integrity data associated with an inode. 1493323eec9SMimi Zohar */ 150f381c272SMimi Zohar struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 151f381c272SMimi Zohar struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 1523323eec9SMimi Zohar 1533323eec9SMimi Zohar /* IMA policy related functions */ 15416cac49fSMimi Zohar enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR }; 1553323eec9SMimi Zohar 1562fe5d6deSMimi Zohar int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, 1572fe5d6deSMimi Zohar int flags); 1583323eec9SMimi Zohar void ima_init_policy(void); 1593323eec9SMimi Zohar void ima_update_policy(void); 1606ccd0456SEric Paris ssize_t ima_parse_add_rule(char *); 1614af4662fSMimi Zohar void ima_delete_rules(void); 1624af4662fSMimi Zohar 1632fe5d6deSMimi Zohar /* Appraise integrity measurements */ 1642fe5d6deSMimi Zohar #define IMA_APPRAISE_ENFORCE 0x01 1652fe5d6deSMimi Zohar #define IMA_APPRAISE_FIX 0x02 166a7f2a366SMimi Zohar #define IMA_APPRAISE_MODULES 0x04 1672fe5d6deSMimi Zohar 1682fe5d6deSMimi Zohar #ifdef CONFIG_IMA_APPRAISE 169d79d72e0SMimi Zohar int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, 170d3634d0fSDmitry Kasatkin struct file *file, const unsigned char *filename, 171d3634d0fSDmitry Kasatkin struct evm_ima_xattr_data *xattr_value, 172d3634d0fSDmitry Kasatkin int xattr_len); 173d26e1936SDmitry Kasatkin int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); 1742fe5d6deSMimi Zohar void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); 175d79d72e0SMimi Zohar enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, 176d79d72e0SMimi Zohar int func); 177d3634d0fSDmitry Kasatkin void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len, 178d3634d0fSDmitry Kasatkin struct ima_digest_data *hash); 179d3634d0fSDmitry Kasatkin int ima_read_xattr(struct dentry *dentry, 180d3634d0fSDmitry Kasatkin struct evm_ima_xattr_data **xattr_value); 1812fe5d6deSMimi Zohar 1822fe5d6deSMimi Zohar #else 183d79d72e0SMimi Zohar static inline int ima_appraise_measurement(int func, 184d79d72e0SMimi Zohar struct integrity_iint_cache *iint, 1852fe5d6deSMimi Zohar struct file *file, 186d3634d0fSDmitry Kasatkin const unsigned char *filename, 187d3634d0fSDmitry Kasatkin struct evm_ima_xattr_data *xattr_value, 188d3634d0fSDmitry Kasatkin int xattr_len) 1892fe5d6deSMimi Zohar { 1902fe5d6deSMimi Zohar return INTEGRITY_UNKNOWN; 1912fe5d6deSMimi Zohar } 1922fe5d6deSMimi Zohar 193d26e1936SDmitry Kasatkin static inline int ima_must_appraise(struct inode *inode, int mask, 194d26e1936SDmitry Kasatkin enum ima_hooks func) 1952fe5d6deSMimi Zohar { 1962fe5d6deSMimi Zohar return 0; 1972fe5d6deSMimi Zohar } 1982fe5d6deSMimi Zohar 1992fe5d6deSMimi Zohar static inline void ima_update_xattr(struct integrity_iint_cache *iint, 2002fe5d6deSMimi Zohar struct file *file) 2012fe5d6deSMimi Zohar { 2022fe5d6deSMimi Zohar } 203d79d72e0SMimi Zohar 204d79d72e0SMimi Zohar static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache 205d79d72e0SMimi Zohar *iint, int func) 206d79d72e0SMimi Zohar { 207d79d72e0SMimi Zohar return INTEGRITY_UNKNOWN; 208d79d72e0SMimi Zohar } 209d3634d0fSDmitry Kasatkin 210d3634d0fSDmitry Kasatkin static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, 211d3634d0fSDmitry Kasatkin int xattr_len, 212d3634d0fSDmitry Kasatkin struct ima_digest_data *hash) 213d3634d0fSDmitry Kasatkin { 214d3634d0fSDmitry Kasatkin } 215d3634d0fSDmitry Kasatkin 216d3634d0fSDmitry Kasatkin static inline int ima_read_xattr(struct dentry *dentry, 217d3634d0fSDmitry Kasatkin struct evm_ima_xattr_data **xattr_value) 218d3634d0fSDmitry Kasatkin { 219d3634d0fSDmitry Kasatkin return 0; 220d3634d0fSDmitry Kasatkin } 221d3634d0fSDmitry Kasatkin 2222fe5d6deSMimi Zohar #endif 2232fe5d6deSMimi Zohar 2244af4662fSMimi Zohar /* LSM based policy rules require audit */ 2254af4662fSMimi Zohar #ifdef CONFIG_IMA_LSM_RULES 2264af4662fSMimi Zohar 2274af4662fSMimi Zohar #define security_filter_rule_init security_audit_rule_init 2284af4662fSMimi Zohar #define security_filter_rule_match security_audit_rule_match 2294af4662fSMimi Zohar 2304af4662fSMimi Zohar #else 2314af4662fSMimi Zohar 2324af4662fSMimi Zohar static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 2334af4662fSMimi Zohar void **lsmrule) 2344af4662fSMimi Zohar { 2354af4662fSMimi Zohar return -EINVAL; 2364af4662fSMimi Zohar } 2374af4662fSMimi Zohar 2384af4662fSMimi Zohar static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 2394af4662fSMimi Zohar void *lsmrule, 2404af4662fSMimi Zohar struct audit_context *actx) 2414af4662fSMimi Zohar { 2424af4662fSMimi Zohar return -EINVAL; 2434af4662fSMimi Zohar } 2444af4662fSMimi Zohar #endif /* CONFIG_IMA_LSM_RULES */ 2453323eec9SMimi Zohar #endif 246