| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2009-2010 IBM Corporation |
| * |
| * Authors: |
| * Mimi Zohar <zohar@us.ibm.com> |
| */ |
| |
| #ifdef pr_fmt |
| #undef pr_fmt |
| #endif |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/types.h> |
| #include <linux/integrity.h> |
| #include <crypto/sha.h> |
| #include <linux/key.h> |
| #include <linux/audit.h> |
| |
| /* iint action cache flags */ |
| #define IMA_MEASURE 0x00000001 |
| #define IMA_MEASURED 0x00000002 |
| #define IMA_APPRAISE 0x00000004 |
| #define IMA_APPRAISED 0x00000008 |
| /*#define IMA_COLLECT 0x00000010 do not use this flag */ |
| #define IMA_COLLECTED 0x00000020 |
| #define IMA_AUDIT 0x00000040 |
| #define IMA_AUDITED 0x00000080 |
| #define IMA_HASH 0x00000100 |
| #define IMA_HASHED 0x00000200 |
| |
| /* iint cache flags */ |
| #define IMA_ACTION_FLAGS 0xff000000 |
| #define IMA_DIGSIG_REQUIRED 0x01000000 |
| #define IMA_PERMIT_DIRECTIO 0x02000000 |
| #define IMA_NEW_FILE 0x04000000 |
| #define EVM_IMMUTABLE_DIGSIG 0x08000000 |
| #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 |
| #define IMA_MODSIG_ALLOWED 0x20000000 |
| #define IMA_CHECK_BLACKLIST 0x40000000 |
| |
| #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
| IMA_HASH | IMA_APPRAISE_SUBMASK) |
| #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
| IMA_HASHED | IMA_COLLECTED | \ |
| IMA_APPRAISED_SUBMASK) |
| |
| /* iint subaction appraise cache flags */ |
| #define IMA_FILE_APPRAISE 0x00001000 |
| #define IMA_FILE_APPRAISED 0x00002000 |
| #define IMA_MMAP_APPRAISE 0x00004000 |
| #define IMA_MMAP_APPRAISED 0x00008000 |
| #define IMA_BPRM_APPRAISE 0x00010000 |
| #define IMA_BPRM_APPRAISED 0x00020000 |
| #define IMA_READ_APPRAISE 0x00040000 |
| #define IMA_READ_APPRAISED 0x00080000 |
| #define IMA_CREDS_APPRAISE 0x00100000 |
| #define IMA_CREDS_APPRAISED 0x00200000 |
| #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
| IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ |
| IMA_CREDS_APPRAISE) |
| #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
| IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ |
| IMA_CREDS_APPRAISED) |
| |
| /* iint cache atomic_flags */ |
| #define IMA_CHANGE_XATTR 0 |
| #define IMA_UPDATE_XATTR 1 |
| #define IMA_CHANGE_ATTR 2 |
| #define IMA_DIGSIG 3 |
| #define IMA_MUST_MEASURE 4 |
| |
| enum evm_ima_xattr_type { |
| IMA_XATTR_DIGEST = 0x01, |
| EVM_XATTR_HMAC, |
| EVM_IMA_XATTR_DIGSIG, |
| IMA_XATTR_DIGEST_NG, |
| EVM_XATTR_PORTABLE_DIGSIG, |
| IMA_XATTR_LAST |
| }; |
| |
| struct evm_ima_xattr_data { |
| u8 type; |
| u8 data[]; |
| } __packed; |
| |
| /* Only used in the EVM HMAC code. */ |
| struct evm_xattr { |
| struct evm_ima_xattr_data data; |
| u8 digest[SHA1_DIGEST_SIZE]; |
| } __packed; |
| |
| #define IMA_MAX_DIGEST_SIZE 64 |
| |
| struct ima_digest_data { |
| u8 algo; |
| u8 length; |
| union { |
| struct { |
| u8 unused; |
| u8 type; |
| } sha1; |
| struct { |
| u8 type; |
| u8 algo; |
| } ng; |
| u8 data[2]; |
| } xattr; |
| u8 digest[]; |
| } __packed; |
| |
| /* |
| * signature format v2 - for using with asymmetric keys |
| */ |
| struct signature_v2_hdr { |
| uint8_t type; /* xattr type */ |
| uint8_t version; /* signature format version */ |
| uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
| __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
| __be16 sig_size; /* signature size */ |
| uint8_t sig[]; /* signature payload */ |
| } __packed; |
| |
| /* integrity data associated with an inode */ |
| struct integrity_iint_cache { |
| struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
| struct mutex mutex; /* protects: version, flags, digest */ |
| struct inode *inode; /* back pointer to inode in question */ |
| u64 version; /* track inode changes */ |
| unsigned long flags; |
| unsigned long measured_pcrs; |
| unsigned long atomic_flags; |
| unsigned long real_ino; |
| dev_t real_dev; |
| enum integrity_status ima_file_status:4; |
| enum integrity_status ima_mmap_status:4; |
| enum integrity_status ima_bprm_status:4; |
| enum integrity_status ima_read_status:4; |
| enum integrity_status ima_creds_status:4; |
| enum integrity_status evm_status:4; |
| struct ima_digest_data *ima_hash; |
| }; |
| |
| /* rbtree tree calls to lookup, insert, delete |
| * integrity data associated with an inode. |
| */ |
| struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
| |
| int integrity_kernel_read(struct file *file, loff_t offset, |
| void *addr, unsigned long count); |
| |
| #define INTEGRITY_KEYRING_EVM 0 |
| #define INTEGRITY_KEYRING_IMA 1 |
| #define INTEGRITY_KEYRING_PLATFORM 2 |
| #define INTEGRITY_KEYRING_MAX 3 |
| |
| extern struct dentry *integrity_dir; |
| |
| struct modsig; |
| |
| #ifdef CONFIG_INTEGRITY_SIGNATURE |
| |
| int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
| const char *digest, int digestlen); |
| int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
| |
| int __init integrity_init_keyring(const unsigned int id); |
| int __init integrity_load_x509(const unsigned int id, const char *path); |
| int __init integrity_load_cert(const unsigned int id, const char *source, |
| const void *data, size_t len, key_perm_t perm); |
| #else |
| |
| static inline int integrity_digsig_verify(const unsigned int id, |
| const char *sig, int siglen, |
| const char *digest, int digestlen) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int integrity_modsig_verify(unsigned int id, |
| const struct modsig *modsig) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int integrity_init_keyring(const unsigned int id) |
| { |
| return 0; |
| } |
| |
| static inline int __init integrity_load_cert(const unsigned int id, |
| const char *source, |
| const void *data, size_t len, |
| key_perm_t perm) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
| |
| #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
| int asymmetric_verify(struct key *keyring, const char *sig, |
| int siglen, const char *data, int datalen); |
| #else |
| static inline int asymmetric_verify(struct key *keyring, const char *sig, |
| int siglen, const char *data, int datalen) |
| { |
| return -EOPNOTSUPP; |
| } |
| #endif |
| |
| #ifdef CONFIG_IMA_APPRAISE_MODSIG |
| int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); |
| #else |
| static inline int ima_modsig_verify(struct key *keyring, |
| const struct modsig *modsig) |
| { |
| return -EOPNOTSUPP; |
| } |
| #endif |
| |
| #ifdef CONFIG_IMA_LOAD_X509 |
| void __init ima_load_x509(void); |
| #else |
| static inline void ima_load_x509(void) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_EVM_LOAD_X509 |
| void __init evm_load_x509(void); |
| #else |
| static inline void evm_load_x509(void) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_INTEGRITY_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); |
| |
| void integrity_audit_message(int audit_msgno, struct inode *inode, |
| const unsigned char *fname, const char *op, |
| const char *cause, int result, int info, |
| int errno); |
| |
| static inline struct audit_buffer * |
| integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) |
| { |
| return audit_log_start(ctx, gfp_mask, type); |
| } |
| |
| #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) |
| { |
| } |
| |
| static inline void integrity_audit_message(int audit_msgno, |
| struct inode *inode, |
| const unsigned char *fname, |
| const char *op, const char *cause, |
| int result, int info, int errno) |
| { |
| } |
| |
| static inline struct audit_buffer * |
| integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) |
| { |
| return NULL; |
| } |
| |
| #endif |
| |
| #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING |
| void __init add_to_platform_keyring(const char *source, const void *data, |
| size_t len); |
| #else |
| static inline void __init add_to_platform_keyring(const char *source, |
| const void *data, size_t len) |
| { |
| } |
| #endif |