326 lines
9.6 KiB
C
326 lines
9.6 KiB
C
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/*
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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/fs.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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#include <crypto/hash_info.h>
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#include "../integrity.h"
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#ifdef CONFIG_HAVE_IMA_KEXEC
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#include <asm/ima.h>
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#endif
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enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
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IMA_SHOW_BINARY_OLD_STRING_FMT, 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 SHA1_DIGEST_SIZE
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#define IMA_EVENT_NAME_LEN_MAX 255
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#define IMA_HASH_BITS 10
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#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
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#define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
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#define IMA_TEMPLATE_NUM_FIELDS_MAX 15
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#define IMA_TEMPLATE_IMA_NAME "ima"
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#define IMA_TEMPLATE_IMA_FMT "d|n"
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/* current content of the policy */
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extern int ima_policy_flag;
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/* set during initialization */
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extern int ima_hash_algo;
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extern int ima_appraise;
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extern struct tpm_chip *ima_tpm_chip;
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extern const char boot_aggregate_name[];
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/* IMA event related data */
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struct ima_event_data {
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struct integrity_iint_cache *iint;
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struct file *file;
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const unsigned char *filename;
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struct evm_ima_xattr_data *xattr_value;
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int xattr_len;
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const char *violation;
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};
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/* IMA template field data definition */
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struct ima_field_data {
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u8 *data;
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u32 len;
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};
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/* IMA template field definition */
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struct ima_template_field {
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const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
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int (*field_init)(struct ima_event_data *event_data,
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struct ima_field_data *field_data);
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void (*field_show)(struct seq_file *m, enum ima_show_type show,
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struct ima_field_data *field_data);
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};
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/* IMA template descriptor definition */
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struct ima_template_desc {
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struct list_head list;
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char *name;
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char *fmt;
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int num_fields;
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struct ima_template_field **fields;
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};
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struct ima_template_entry {
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int pcr;
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u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
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struct ima_template_desc *template_desc; /* template descriptor */
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u32 template_data_len;
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struct ima_field_data template_data[0]; /* template related data */
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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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/* Some details preceding the binary serialized measurement list */
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struct ima_kexec_hdr {
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u16 version;
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u16 _reserved0;
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u32 _reserved1;
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u64 buffer_size;
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u64 count;
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};
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#ifdef CONFIG_HAVE_IMA_KEXEC
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void ima_load_kexec_buffer(void);
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#else
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static inline void ima_load_kexec_buffer(void) {}
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#endif /* CONFIG_HAVE_IMA_KEXEC */
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/*
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* The default binary_runtime_measurements list format is defined as the
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* platform native format. The canonical format is defined as little-endian.
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*/
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extern bool ima_canonical_fmt;
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/* Internal IMA function definitions */
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int ima_init(void);
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int ima_fs_init(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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const unsigned char *filename);
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int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
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int ima_calc_buffer_hash(const void *buf, loff_t len,
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struct ima_digest_data *hash);
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int ima_calc_field_array_hash(struct ima_field_data *field_data,
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struct ima_template_desc *desc, int num_fields,
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struct ima_digest_data *hash);
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int ima_calc_boot_aggregate(struct ima_digest_data *hash);
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void ima_add_violation(struct file *file, const unsigned char *filename,
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struct integrity_iint_cache *iint,
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const char *op, const char *cause);
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int ima_init_crypto(void);
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void ima_putc(struct seq_file *m, void *data, int datalen);
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void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
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struct ima_template_desc *ima_template_desc_current(void);
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int ima_restore_measurement_entry(struct ima_template_entry *entry);
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int ima_restore_measurement_list(loff_t bufsize, void *buf);
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int ima_measurements_show(struct seq_file *m, void *v);
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unsigned long ima_get_binary_runtime_size(void);
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int ima_init_template(void);
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void ima_init_template_list(void);
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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 int ima_hash_key(u8 *digest)
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{
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/* there is no point in taking a hash of part of a digest */
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return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
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}
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#define __ima_hooks(hook) \
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hook(NONE) \
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hook(FILE_CHECK) \
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hook(MMAP_CHECK) \
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hook(BPRM_CHECK) \
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hook(CREDS_CHECK) \
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hook(POST_SETATTR) \
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hook(MODULE_CHECK) \
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hook(FIRMWARE_CHECK) \
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hook(KEXEC_KERNEL_CHECK) \
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hook(KEXEC_INITRAMFS_CHECK) \
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hook(POLICY_CHECK) \
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hook(MAX_CHECK)
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#define __ima_hook_enumify(ENUM) ENUM,
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enum ima_hooks {
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__ima_hooks(__ima_hook_enumify)
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};
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/* LIM API function definitions */
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int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
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int mask, enum ima_hooks func, int *pcr);
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int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
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int ima_collect_measurement(struct integrity_iint_cache *iint,
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struct file *file, void *buf, loff_t size,
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enum hash_algo algo);
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void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
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const unsigned char *filename,
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struct evm_ima_xattr_data *xattr_value,
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int xattr_len, int pcr);
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void ima_audit_measurement(struct integrity_iint_cache *iint,
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const unsigned char *filename);
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int ima_alloc_init_template(struct ima_event_data *event_data,
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struct ima_template_entry **entry);
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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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const unsigned char *filename, int pcr);
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void ima_free_template_entry(struct ima_template_entry *entry);
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const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
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/* IMA policy related functions */
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int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
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enum ima_hooks func, int mask, int flags, int *pcr);
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void ima_init_policy(void);
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void ima_update_policy(void);
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void ima_update_policy_flag(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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int ima_check_policy(void);
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void *ima_policy_start(struct seq_file *m, loff_t *pos);
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void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
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void ima_policy_stop(struct seq_file *m, void *v);
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int ima_policy_show(struct seq_file *m, void *v);
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/* Appraise integrity measurements */
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#define IMA_APPRAISE_ENFORCE 0x01
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#define IMA_APPRAISE_FIX 0x02
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#define IMA_APPRAISE_LOG 0x04
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#define IMA_APPRAISE_MODULES 0x08
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#define IMA_APPRAISE_FIRMWARE 0x10
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#define IMA_APPRAISE_POLICY 0x20
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#define IMA_APPRAISE_KEXEC 0x40
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#ifdef CONFIG_IMA_APPRAISE
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int ima_appraise_measurement(enum ima_hooks func,
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struct integrity_iint_cache *iint,
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struct file *file, const unsigned char *filename,
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struct evm_ima_xattr_data *xattr_value,
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int xattr_len);
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int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
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void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
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enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
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enum ima_hooks func);
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enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
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int xattr_len);
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int ima_read_xattr(struct dentry *dentry,
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struct evm_ima_xattr_data **xattr_value);
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#else
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static inline int ima_appraise_measurement(enum ima_hooks func,
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struct integrity_iint_cache *iint,
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struct file *file,
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const unsigned char *filename,
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struct evm_ima_xattr_data *xattr_value,
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int xattr_len)
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{
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return INTEGRITY_UNKNOWN;
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}
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static inline int ima_must_appraise(struct inode *inode, int mask,
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enum ima_hooks func)
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{
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return 0;
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}
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static inline void ima_update_xattr(struct integrity_iint_cache *iint,
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struct file *file)
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{
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}
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static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
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*iint,
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enum ima_hooks func)
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{
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return INTEGRITY_UNKNOWN;
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}
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static inline enum hash_algo
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ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
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{
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return ima_hash_algo;
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}
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static inline int ima_read_xattr(struct dentry *dentry,
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struct evm_ima_xattr_data **xattr_value)
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{
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return 0;
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}
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#endif /* CONFIG_IMA_APPRAISE */
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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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#ifdef CONFIG_IMA_READ_POLICY
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#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
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#else
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#define POLICY_FILE_FLAGS S_IWUSR
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#endif /* CONFIG_IMA_READ_POLICY */
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#endif /* __LINUX_IMA_H */
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