mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
a7d3d0392a
The CONFIG_IMA_LOAD_X509 and CONFIG_EVM_LOAD_X509 options permit loading x509 signed certificates onto the trusted keyrings without verifying the x509 certificate file's signature. This patch replaces the call to the integrity_read_file() specific function with the common kernel_read_file_from_path() function. To avoid verifying the file signature, this patch defines READING_X509_CERTFICATE. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
189 lines
5 KiB
C
189 lines
5 KiB
C
/*
|
|
* Copyright (C) 2009-2010 IBM Corporation
|
|
*
|
|
* Authors:
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/integrity.h>
|
|
#include <crypto/sha.h>
|
|
#include <linux/key.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
|
|
|
|
/* iint cache flags */
|
|
#define IMA_ACTION_FLAGS 0xff000000
|
|
#define IMA_ACTION_RULE_FLAGS 0x06000000
|
|
#define IMA_DIGSIG 0x01000000
|
|
#define IMA_DIGSIG_REQUIRED 0x02000000
|
|
#define IMA_PERMIT_DIRECTIO 0x04000000
|
|
#define IMA_NEW_FILE 0x08000000
|
|
|
|
#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
|
|
IMA_APPRAISE_SUBMASK)
|
|
#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
|
|
IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
|
|
|
|
/* iint subaction appraise cache flags */
|
|
#define IMA_FILE_APPRAISE 0x00000100
|
|
#define IMA_FILE_APPRAISED 0x00000200
|
|
#define IMA_MMAP_APPRAISE 0x00000400
|
|
#define IMA_MMAP_APPRAISED 0x00000800
|
|
#define IMA_BPRM_APPRAISE 0x00001000
|
|
#define IMA_BPRM_APPRAISED 0x00002000
|
|
#define IMA_READ_APPRAISE 0x00004000
|
|
#define IMA_READ_APPRAISED 0x00008000
|
|
#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
|
|
IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
|
|
#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
|
|
IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
|
|
|
|
enum evm_ima_xattr_type {
|
|
IMA_XATTR_DIGEST = 0x01,
|
|
EVM_XATTR_HMAC,
|
|
EVM_IMA_XATTR_DIGSIG,
|
|
IMA_XATTR_DIGEST_NG,
|
|
IMA_XATTR_LAST
|
|
};
|
|
|
|
struct evm_ima_xattr_data {
|
|
u8 type;
|
|
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 inode *inode; /* back pointer to inode in question */
|
|
u64 version; /* track inode changes */
|
|
unsigned long flags;
|
|
unsigned long measured_pcrs;
|
|
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 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_MODULE 2
|
|
#define INTEGRITY_KEYRING_MAX 3
|
|
|
|
#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);
|
|
#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;
|
|
}
|
|
#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);
|
|
#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)
|
|
{
|
|
}
|
|
#endif
|