8b68150883
Pull integrity updates from Mimi Zohar:
"Bug fixes, code clean up, and new features:
- IMA policy rules can be defined in terms of LSM labels, making the
IMA policy dependent on LSM policy label changes, in particular LSM
label deletions. The new environment, in which IMA-appraisal is
being used, frequently updates the LSM policy and permits LSM label
deletions.
- Prevent an mmap'ed shared file opened for write from also being
mmap'ed execute. In the long term, making this and other similar
changes at the VFS layer would be preferable.
- The IMA per policy rule template format support is needed for a
couple of new/proposed features (eg. kexec boot command line
measurement, appended signatures, and VFS provided file hashes).
- Other than the "boot-aggregate" record in the IMA measuremeent
list, all other measurements are of file data. Measuring and
storing the kexec boot command line in the IMA measurement list is
the first buffer based measurement included in the measurement
list"
* 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
integrity: Introduce struct evm_xattr
ima: Update MAX_TEMPLATE_NAME_LEN to fit largest reasonable definition
KEXEC: Call ima_kexec_cmdline to measure the boot command line args
IMA: Define a new template field buf
IMA: Define a new hook to measure the kexec boot command line arguments
IMA: support for per policy rule template formats
integrity: Fix __integrity_init_keyring() section mismatch
ima: Use designated initializers for struct ima_event_data
ima: use the lsm policy update notifier
LSM: switch to blocking policy update notifiers
x86/ima: fix the Kconfig dependency for IMA_ARCH_POLICY
ima: Make arch_policy_entry static
ima: prevent a file already mmap'ed write to be mmap'ed execute
x86/ima: check EFI SetupMode too
248 lines
6.4 KiB
C
248 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2009-2010 IBM Corporation
|
|
*
|
|
* Authors:
|
|
* Mimi Zohar <zohar@us.ibm.com>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/integrity.h>
|
|
#include <crypto/sha.h>
|
|
#include <linux/key.h>
|
|
#include <linux/audit.h>
|
|
|
|
struct key_acl;
|
|
|
|
/* 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_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[0];
|
|
} __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[0]; /* 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;
|
|
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;
|
|
|
|
#ifdef CONFIG_INTEGRITY_SIGNATURE
|
|
|
|
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
|
|
const char *digest, int digestlen);
|
|
|
|
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, struct key_acl *acl);
|
|
#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_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,
|
|
struct key_acl *acl)
|
|
{
|
|
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_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);
|
|
|
|
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 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
|