| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2005,2006,2007,2008 IBM Corporation |
| * |
| * Authors: |
| * Reiner Sailer <sailer@watson.ibm.com> |
| * Mimi Zohar <zohar@us.ibm.com> |
| * |
| * 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" |
| |
| #ifdef CONFIG_HAVE_IMA_KEXEC |
| #include <asm/ima.h> |
| #endif |
| |
| 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, TPM_PCR10 = 10 }; |
| |
| /* 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 10 |
| #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_hash_algo; |
| extern int ima_appraise; |
| extern struct tpm_chip *ima_tpm_chip; |
| extern const char boot_aggregate_name[]; |
| |
| /* 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 struct modsig *modsig; |
| const char *violation; |
| const void *buf; |
| int buf_len; |
| }; |
| |
| /* 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 { |
| struct list_head list; |
| char *name; |
| char *fmt; |
| int num_fields; |
| const 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 */ |
| |
| /* Some details preceding the binary serialized measurement list */ |
| struct ima_kexec_hdr { |
| u16 version; |
| u16 _reserved0; |
| u32 _reserved1; |
| u64 buffer_size; |
| u64 count; |
| }; |
| |
| extern const int read_idmap[]; |
| |
| #ifdef CONFIG_HAVE_IMA_KEXEC |
| void ima_load_kexec_buffer(void); |
| #else |
| static inline void ima_load_kexec_buffer(void) {} |
| #endif /* CONFIG_HAVE_IMA_KEXEC */ |
| |
| /* |
| * The default binary_runtime_measurements list format is defined as the |
| * platform native format. The canonical format is defined as little-endian. |
| */ |
| extern bool ima_canonical_fmt; |
| |
| /* 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 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); |
| int template_desc_init_fields(const char *template_fmt, |
| const struct ima_template_field ***fields, |
| int *num_fields); |
| struct ima_template_desc *ima_template_desc_current(void); |
| struct ima_template_desc *lookup_template_desc(const char *name); |
| bool ima_template_has_modsig(const struct ima_template_desc *ima_template); |
| int ima_restore_measurement_entry(struct ima_template_entry *entry); |
| int ima_restore_measurement_list(loff_t bufsize, void *buf); |
| int ima_measurements_show(struct seq_file *m, void *v); |
| unsigned long ima_get_binary_runtime_size(void); |
| int ima_init_template(void); |
| void ima_init_template_list(void); |
| int __init ima_init_digests(void); |
| int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event, |
| void *lsm_data); |
| |
| /* |
| * 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 int ima_hash_key(u8 *digest) |
| { |
| /* there is no point in taking a hash of part of a digest */ |
| return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE; |
| } |
| |
| #define __ima_hooks(hook) \ |
| hook(NONE) \ |
| hook(FILE_CHECK) \ |
| hook(MMAP_CHECK) \ |
| hook(BPRM_CHECK) \ |
| hook(CREDS_CHECK) \ |
| hook(POST_SETATTR) \ |
| hook(MODULE_CHECK) \ |
| hook(FIRMWARE_CHECK) \ |
| hook(KEXEC_KERNEL_CHECK) \ |
| hook(KEXEC_INITRAMFS_CHECK) \ |
| hook(POLICY_CHECK) \ |
| hook(KEXEC_CMDLINE) \ |
| hook(MAX_CHECK) |
| #define __ima_hook_enumify(ENUM) ENUM, |
| |
| enum ima_hooks { |
| __ima_hooks(__ima_hook_enumify) |
| }; |
| |
| extern const char *const func_tokens[]; |
| |
| struct modsig; |
| |
| /* LIM API function definitions */ |
| int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid, |
| int mask, enum ima_hooks func, int *pcr, |
| struct ima_template_desc **template_desc); |
| 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, struct modsig *modsig); |
| 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, const struct modsig *modsig, int pcr, |
| struct ima_template_desc *template_desc); |
| 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, |
| struct ima_template_desc *template_desc); |
| 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, char *filename); |
| |
| /* IMA policy related functions */ |
| int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid, |
| enum ima_hooks func, int mask, int flags, int *pcr, |
| struct ima_template_desc **template_desc); |
| 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 |
| #define IMA_APPRAISE_KEXEC 0x40 |
| |
| #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, const struct modsig *modsig); |
| 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, |
| const struct modsig *modsig) |
| { |
| 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 /* CONFIG_IMA_APPRAISE */ |
| |
| #ifdef CONFIG_IMA_APPRAISE_MODSIG |
| bool ima_hook_supports_modsig(enum ima_hooks func); |
| int ima_read_modsig(enum ima_hooks func, const void *buf, loff_t buf_len, |
| struct modsig **modsig); |
| void ima_collect_modsig(struct modsig *modsig, const void *buf, loff_t size); |
| int ima_get_modsig_digest(const struct modsig *modsig, enum hash_algo *algo, |
| const u8 **digest, u32 *digest_size); |
| int ima_get_raw_modsig(const struct modsig *modsig, const void **data, |
| u32 *data_len); |
| void ima_free_modsig(struct modsig *modsig); |
| #else |
| static inline bool ima_hook_supports_modsig(enum ima_hooks func) |
| { |
| return false; |
| } |
| |
| static inline int ima_read_modsig(enum ima_hooks func, const void *buf, |
| loff_t buf_len, struct modsig **modsig) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline void ima_collect_modsig(struct modsig *modsig, const void *buf, |
| loff_t size) |
| { |
| } |
| |
| static inline int ima_get_modsig_digest(const struct modsig *modsig, |
| enum hash_algo *algo, const u8 **digest, |
| u32 *digest_size) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int ima_get_raw_modsig(const struct modsig *modsig, |
| const void **data, u32 *data_len) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline void ima_free_modsig(struct modsig *modsig) |
| { |
| } |
| #endif /* CONFIG_IMA_APPRAISE_MODSIG */ |
| |
| /* LSM based policy rules require audit */ |
| #ifdef CONFIG_IMA_LSM_RULES |
| |
| #define security_filter_rule_init security_audit_rule_init |
| #define security_filter_rule_free security_audit_rule_free |
| #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 void security_filter_rule_free(void *lsmrule) |
| { |
| } |
| |
| static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, |
| void *lsmrule) |
| { |
| return -EINVAL; |
| } |
| #endif /* CONFIG_IMA_LSM_RULES */ |
| |
| #ifdef CONFIG_IMA_READ_POLICY |
| #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR) |
| #else |
| #define POLICY_FILE_FLAGS S_IWUSR |
| #endif /* CONFIG_IMA_READ_POLICY */ |
| |
| #endif /* __LINUX_IMA_H */ |