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authorDmitry Kasatkin <d.kasatkin@samsung.com>2013-08-12 11:22:51 +0300
committerMimi Zohar <zohar@linux.vnet.ibm.com>2013-10-26 21:32:55 -0400
commit3ea7a56067e663278470c04fd655adf809e72d4d (patch)
tree8216b30887dc86cf7594f6fd1cc729b7eda28c0a /security/integrity
parente7a2ad7eb6f48ad80c70a22dd8167fb34b409466 (diff)
downloadlinux-stericsson-3ea7a56067e663278470c04fd655adf809e72d4d.tar.gz
ima: provide hash algo info in the xattr
All files labeled with 'security.ima' hashes, are hashed using the same hash algorithm. Changing from one hash algorithm to another, requires relabeling the filesystem. This patch defines a new xattr type, which includes the hash algorithm, permitting different files to be hashed with different algorithms. Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/ima/ima_appraise.c61
-rw-r--r--security/integrity/integrity.h13
2 files changed, 59 insertions, 15 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 116630ca5ff3..734e9468aca0 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -15,6 +15,7 @@
#include <linux/magic.h>
#include <linux/ima.h>
#include <linux/evm.h>
+#include <crypto/hash_info.h>
#include "ima.h"
@@ -45,10 +46,22 @@ int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
static int ima_fix_xattr(struct dentry *dentry,
struct integrity_iint_cache *iint)
{
- iint->ima_hash->type = IMA_XATTR_DIGEST;
- return __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
- &iint->ima_hash->type,
- 1 + iint->ima_hash->length, 0);
+ int rc, offset;
+ u8 algo = iint->ima_hash->algo;
+
+ if (algo <= HASH_ALGO_SHA1) {
+ offset = 1;
+ iint->ima_hash->xattr.sha1.type = IMA_XATTR_DIGEST;
+ } else {
+ offset = 0;
+ iint->ima_hash->xattr.ng.type = IMA_XATTR_DIGEST_NG;
+ iint->ima_hash->xattr.ng.algo = algo;
+ }
+ rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
+ &iint->ima_hash->xattr.data[offset],
+ (sizeof(iint->ima_hash->xattr) - offset) +
+ iint->ima_hash->length, 0);
+ return rc;
}
/* Return specific func appraised cached result */
@@ -112,15 +125,31 @@ void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
{
struct signature_v2_hdr *sig;
- if (!xattr_value || xattr_len < 0 || xattr_len <= 1 + sizeof(*sig))
+ if (!xattr_value || xattr_len < 2)
return;
- sig = (typeof(sig)) xattr_value->digest;
-
- if (xattr_value->type != EVM_IMA_XATTR_DIGSIG || sig->version != 2)
- return;
-
- hash->algo = sig->hash_algo;
+ switch (xattr_value->type) {
+ case EVM_IMA_XATTR_DIGSIG:
+ sig = (typeof(sig))xattr_value;
+ if (sig->version != 2 || xattr_len <= sizeof(*sig))
+ return;
+ hash->algo = sig->hash_algo;
+ break;
+ case IMA_XATTR_DIGEST_NG:
+ hash->algo = xattr_value->digest[0];
+ break;
+ case IMA_XATTR_DIGEST:
+ /* this is for backward compatibility */
+ if (xattr_len == 21) {
+ unsigned int zero = 0;
+ if (!memcmp(&xattr_value->digest[16], &zero, 4))
+ hash->algo = HASH_ALGO_MD5;
+ else
+ hash->algo = HASH_ALGO_SHA1;
+ } else if (xattr_len == 17)
+ hash->algo = HASH_ALGO_MD5;
+ break;
+ }
}
int ima_read_xattr(struct dentry *dentry,
@@ -153,7 +182,7 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
enum integrity_status status = INTEGRITY_UNKNOWN;
const char *op = "appraise_data";
char *cause = "unknown";
- int rc = xattr_len;
+ int rc = xattr_len, hash_start = 0;
if (!ima_appraise)
return 0;
@@ -180,17 +209,21 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
goto out;
}
switch (xattr_value->type) {
+ case IMA_XATTR_DIGEST_NG:
+ /* first byte contains algorithm id */
+ hash_start = 1;
case IMA_XATTR_DIGEST:
if (iint->flags & IMA_DIGSIG_REQUIRED) {
cause = "IMA signature required";
status = INTEGRITY_FAIL;
break;
}
- if (xattr_len - 1 >= iint->ima_hash->length)
+ if (xattr_len - sizeof(xattr_value->type) - hash_start >=
+ iint->ima_hash->length)
/* xattr length may be longer. md5 hash in previous
version occupied 20 bytes in xattr, instead of 16
*/
- rc = memcmp(xattr_value->digest,
+ rc = memcmp(&xattr_value->digest[hash_start],
iint->ima_hash->digest,
iint->ima_hash->length);
else
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 5429ca59125b..2fb5e53e927f 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -54,6 +54,7 @@ enum evm_ima_xattr_type {
IMA_XATTR_DIGEST = 0x01,
EVM_XATTR_HMAC,
EVM_IMA_XATTR_DIGSIG,
+ IMA_XATTR_DIGEST_NG,
};
struct evm_ima_xattr_data {
@@ -66,7 +67,17 @@ struct evm_ima_xattr_data {
struct ima_digest_data {
u8 algo;
u8 length;
- u8 type;
+ union {
+ struct {
+ u8 unused;
+ u8 type;
+ } sha1;
+ struct {
+ u8 type;
+ u8 algo;
+ } ng;
+ u8 data[2];
+ } xattr;
u8 digest[0];
} __packed;