287 lines
8.3 KiB
C
287 lines
8.3 KiB
C
/*
|
|
* 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/fs.h>
|
|
#include <linux/security.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/tpm.h>
|
|
#include <linux/audit.h>
|
|
#include <crypto/hash_info.h>
|
|
|
|
#include "../integrity.h"
|
|
|
|
enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
|
|
IMA_SHOW_BINARY_OLD_STRING_FMT, 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)
|
|
|
|
#define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
|
|
#define IMA_TEMPLATE_NUM_FIELDS_MAX 15
|
|
|
|
#define IMA_TEMPLATE_IMA_NAME "ima"
|
|
#define IMA_TEMPLATE_IMA_FMT "d|n"
|
|
|
|
/* current content of the policy */
|
|
extern int ima_policy_flag;
|
|
|
|
/* set during initialization */
|
|
extern int ima_initialized;
|
|
extern int ima_used_chip;
|
|
extern int ima_hash_algo;
|
|
extern int ima_appraise;
|
|
|
|
/* IMA event related data */
|
|
struct ima_event_data {
|
|
struct integrity_iint_cache *iint;
|
|
struct file *file;
|
|
const unsigned char *filename;
|
|
struct evm_ima_xattr_data *xattr_value;
|
|
int xattr_len;
|
|
const char *violation;
|
|
};
|
|
|
|
/* IMA template field data definition */
|
|
struct ima_field_data {
|
|
u8 *data;
|
|
u32 len;
|
|
};
|
|
|
|
/* IMA template field definition */
|
|
struct ima_template_field {
|
|
const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
|
|
int (*field_init)(struct ima_event_data *event_data,
|
|
struct ima_field_data *field_data);
|
|
void (*field_show)(struct seq_file *m, enum ima_show_type show,
|
|
struct ima_field_data *field_data);
|
|
};
|
|
|
|
/* IMA template descriptor definition */
|
|
struct ima_template_desc {
|
|
char *name;
|
|
char *fmt;
|
|
int num_fields;
|
|
struct ima_template_field **fields;
|
|
};
|
|
|
|
struct ima_template_entry {
|
|
int pcr;
|
|
u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
|
|
struct ima_template_desc *template_desc; /* template descriptor */
|
|
u32 template_data_len;
|
|
struct ima_field_data template_data[0]; /* template related data */
|
|
};
|
|
|
|
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 */
|
|
|
|
/* Internal IMA function definitions */
|
|
int ima_init(void);
|
|
int ima_fs_init(void);
|
|
int ima_add_template_entry(struct ima_template_entry *entry, int violation,
|
|
const char *op, struct inode *inode,
|
|
const unsigned char *filename);
|
|
int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
|
|
int ima_calc_buffer_hash(const void *buf, loff_t len,
|
|
struct ima_digest_data *hash);
|
|
int ima_calc_field_array_hash(struct ima_field_data *field_data,
|
|
struct ima_template_desc *desc, int num_fields,
|
|
struct ima_digest_data *hash);
|
|
int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
|
|
void ima_add_violation(struct file *file, const unsigned char *filename,
|
|
struct integrity_iint_cache *iint,
|
|
const char *op, const char *cause);
|
|
int ima_init_crypto(void);
|
|
void ima_putc(struct seq_file *m, void *data, int datalen);
|
|
void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
|
|
struct ima_template_desc *ima_template_desc_current(void);
|
|
int ima_init_template(void);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
enum ima_hooks {
|
|
FILE_CHECK = 1,
|
|
MMAP_CHECK,
|
|
BPRM_CHECK,
|
|
POST_SETATTR,
|
|
MODULE_CHECK,
|
|
FIRMWARE_CHECK,
|
|
KEXEC_KERNEL_CHECK,
|
|
KEXEC_INITRAMFS_CHECK,
|
|
POLICY_CHECK,
|
|
MAX_CHECK
|
|
};
|
|
|
|
/* LIM API function definitions */
|
|
int ima_get_action(struct inode *inode, int mask,
|
|
enum ima_hooks func, int *pcr);
|
|
int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
|
|
int ima_collect_measurement(struct integrity_iint_cache *iint,
|
|
struct file *file, void *buf, loff_t size,
|
|
enum hash_algo algo);
|
|
void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
|
|
const unsigned char *filename,
|
|
struct evm_ima_xattr_data *xattr_value,
|
|
int xattr_len, int pcr);
|
|
void ima_audit_measurement(struct integrity_iint_cache *iint,
|
|
const unsigned char *filename);
|
|
int ima_alloc_init_template(struct ima_event_data *event_data,
|
|
struct ima_template_entry **entry);
|
|
int ima_store_template(struct ima_template_entry *entry, int violation,
|
|
struct inode *inode,
|
|
const unsigned char *filename, int pcr);
|
|
void ima_free_template_entry(struct ima_template_entry *entry);
|
|
const char *ima_d_path(const struct path *path, char **pathbuf);
|
|
|
|
/* IMA policy related functions */
|
|
int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
|
|
int flags, int *pcr);
|
|
void ima_init_policy(void);
|
|
void ima_update_policy(void);
|
|
void ima_update_policy_flag(void);
|
|
ssize_t ima_parse_add_rule(char *);
|
|
void ima_delete_rules(void);
|
|
int ima_check_policy(void);
|
|
void *ima_policy_start(struct seq_file *m, loff_t *pos);
|
|
void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
|
|
void ima_policy_stop(struct seq_file *m, void *v);
|
|
int ima_policy_show(struct seq_file *m, void *v);
|
|
|
|
/* Appraise integrity measurements */
|
|
#define IMA_APPRAISE_ENFORCE 0x01
|
|
#define IMA_APPRAISE_FIX 0x02
|
|
#define IMA_APPRAISE_LOG 0x04
|
|
#define IMA_APPRAISE_MODULES 0x08
|
|
#define IMA_APPRAISE_FIRMWARE 0x10
|
|
#define IMA_APPRAISE_POLICY 0x20
|
|
|
|
#ifdef CONFIG_IMA_APPRAISE
|
|
int ima_appraise_measurement(enum ima_hooks func,
|
|
struct integrity_iint_cache *iint,
|
|
struct file *file, const unsigned char *filename,
|
|
struct evm_ima_xattr_data *xattr_value,
|
|
int xattr_len, int opened);
|
|
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);
|
|
enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
|
|
enum ima_hooks func);
|
|
enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
|
|
int xattr_len);
|
|
int ima_read_xattr(struct dentry *dentry,
|
|
struct evm_ima_xattr_data **xattr_value);
|
|
|
|
#else
|
|
static inline int ima_appraise_measurement(enum ima_hooks func,
|
|
struct integrity_iint_cache *iint,
|
|
struct file *file,
|
|
const unsigned char *filename,
|
|
struct evm_ima_xattr_data *xattr_value,
|
|
int xattr_len, int opened)
|
|
{
|
|
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)
|
|
{
|
|
}
|
|
|
|
static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
|
|
*iint,
|
|
enum ima_hooks func)
|
|
{
|
|
return INTEGRITY_UNKNOWN;
|
|
}
|
|
|
|
static inline enum hash_algo
|
|
ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
|
|
{
|
|
return ima_hash_algo;
|
|
}
|
|
|
|
static inline int ima_read_xattr(struct dentry *dentry,
|
|
struct evm_ima_xattr_data **xattr_value)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#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_TRUSTED_KEYRING */
|
|
|
|
#ifdef CONFIG_IMA_READ_POLICY
|
|
#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
|
|
#else
|
|
#define POLICY_FILE_FLAGS S_IWUSR
|
|
#endif /* CONFIG_IMA_WRITE_POLICY */
|
|
|
|
#endif /* __LINUX_IMA_H */
|