[PATCH v6 04/20] evm: add support for different security.evm data types

[Mimi Zohar <zohar@linux.vnet.ibm.com>]

From: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>

EVM protects a file's security extended attributes(xattrs) against integrity
attacks. The current patchset maintains an HMAC-sha1 value across the security
xattrs, storing the value as the extended attribute 'security.evm'. We
anticipate other methods for protecting the security extended attributes.
This patch reserves the first byte of 'security.evm' as a place holder for
the type of method.

Changelog v6:
- move evm_ima_xattr_type definition to security/integrity/integrity.h
- defined a structure for the EVM xattr called evm_ima_xattr_data
  (based on Serge Hallyn's suggestion)

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
---
 include/linux/integrity.h           |    1 +
 security/integrity/evm/evm_crypto.c |   11 +++++++----
 security/integrity/evm/evm_main.c   |   10 +++++-----
 security/integrity/integrity.h      |   11 +++++++++++
 4 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/include/linux/integrity.h b/include/linux/integrity.h
index e715a2a..9684433 100644
--- a/include/linux/integrity.h
+++ b/include/linux/integrity.h
@@ -19,6 +19,7 @@ enum integrity_status {
 	INTEGRITY_UNKNOWN,
 };
 
+/* List of EVM protected security xattrs */
 #ifdef CONFIG_INTEGRITY
 extern int integrity_inode_alloc(struct inode *inode);
 extern void integrity_inode_free(struct inode *inode);
diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index d49bb00..c631b99 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -141,14 +141,17 @@ int evm_update_evmxattr(struct dentry *dentry, const char *xattr_name,
 			const char *xattr_value, size_t xattr_value_len)
 {
 	struct inode *inode = dentry->d_inode;
-	u8 hmac[SHA1_DIGEST_SIZE];
+	struct evm_ima_xattr_data xattr_data;
 	int rc = 0;
 
 	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
-			   xattr_value_len, hmac);
-	if (rc == 0)
+			   xattr_value_len, xattr_data.digest);
+	if (rc == 0) {
+		xattr_data.type = EVM_XATTR_HMAC;
 		rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_EVM,
-					   hmac, SHA1_DIGEST_SIZE, 0);
+					   &xattr_data,
+					   sizeof(xattr_data), 0);
+	}
 	else if (rc == -ENODATA)
 		rc = inode->i_op->removexattr(dentry, XATTR_NAME_EVM);
 	return rc;
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index a8fa45f..c0580dd1 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -51,20 +51,20 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 					     size_t xattr_value_len,
 					     struct integrity_iint_cache *iint)
 {
-	char hmac_val[SHA1_DIGEST_SIZE];
+	struct evm_ima_xattr_data xattr_data;
 	int rc;
 
 	if (iint->hmac_status != INTEGRITY_UNKNOWN)
 		return iint->hmac_status;
 
-	memset(hmac_val, 0, sizeof hmac_val);
 	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
-			   xattr_value_len, hmac_val);
+			   xattr_value_len, xattr_data.digest);
 	if (rc < 0)
 		return INTEGRITY_UNKNOWN;
 
-	rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, hmac_val, sizeof hmac_val,
-			   GFP_NOFS);
+	xattr_data.type = EVM_XATTR_HMAC;
+	rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, (u8 *)&xattr_data,
+			   sizeof xattr_data, GFP_NOFS);
 	if (rc < 0)
 		goto err_out;
 	iint->hmac_status = INTEGRITY_PASS;
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 397a46b..7efbf56 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -18,6 +18,17 @@
 /* iint cache flags */
 #define IMA_MEASURED		0x01
 
+enum evm_ima_xattr_type {
+	IMA_XATTR_DIGEST = 0x01,
+	EVM_XATTR_HMAC,
+	EVM_IMA_XATTR_DIGSIG,
+};
+
+struct evm_ima_xattr_data {
+	u8 type;
+	u8 digest[SHA1_DIGEST_SIZE];
+}  __attribute__((packed));
+
 /* integrity data associated with an inode */
 struct integrity_iint_cache {
 	struct rb_node rb_node; /* rooted in integrity_iint_tree */
-- 
1.7.3.4