[PATCH 91/97] Netlabel: Return the labeling type on socket

From: Casey Schaufler <casey@schaufler-ca.com>
To: jmorris@namei.org, linux-security-module@vger.kernel.org,
	selinux@vger.kernel.org
Cc: keescook@chromium.org, john.johansen@canonical.com,
	penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com
Subject: [PATCH 91/97] Netlabel: Return the labeling type on socket
Date: Thu, 28 Feb 2019 14:43:50 -0800	[thread overview]
Message-ID: <20190228224356.2608-22-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190228224356.2608-1-casey@schaufler-ca.com>

Change netlbl_req_setattr() to return the labeling
type of the domain. This allows the labeling types to
be compared when two LSMs want to determine how a socket
should be used.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 net/netlabel/netlabel_kapi.c | 18 +++++++++++-------
 security/selinux/netlabel.c  |  2 ++
 security/smack/smack_lsm.c   |  2 ++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 1d362a38dd05..5c5825171281 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -1185,12 +1185,14 @@ int netlbl_conn_setattr(struct sock *sk,
  *
  * Description:
  * Attach the correct label to the given socket using the security attributes
- * specified in @secattr.  Returns zero on success, negative values on failure.
+ * specified in @secattr.  Returns the NLTYPE on success, negative values on
+ * failure.
  *
  */
 int netlbl_req_setattr(struct request_sock *req,
 		       const struct netlbl_lsm_secattr *secattr)
 {
+	int rc;
 	int ret_val;
 	struct netlbl_dommap_def *entry;
 	struct inet_request_sock *ireq = inet_rsk(req);
@@ -1204,14 +1206,15 @@ int netlbl_req_setattr(struct request_sock *req,
 			ret_val = -ENOENT;
 			goto req_setattr_return;
 		}
+		ret_val = entry->type;
 		switch (entry->type) {
 		case NETLBL_NLTYPE_CIPSOV4:
-			ret_val = cipso_v4_req_setattr(req,
-						       entry->cipso, secattr);
+			rc = cipso_v4_req_setattr(req, entry->cipso, secattr);
+			if (rc < 0)
+				ret_val = rc;
 			break;
 		case NETLBL_NLTYPE_UNLABELED:
 			netlbl_req_delattr(req);
-			ret_val = 0;
 			break;
 		default:
 			ret_val = -ENOENT;
@@ -1225,14 +1228,15 @@ int netlbl_req_setattr(struct request_sock *req,
 			ret_val = -ENOENT;
 			goto req_setattr_return;
 		}
+		ret_val = entry->type;
 		switch (entry->type) {
 		case NETLBL_NLTYPE_CALIPSO:
-			ret_val = calipso_req_setattr(req,
-						      entry->calipso, secattr);
+			rc = calipso_req_setattr(req, entry->calipso, secattr);
+			if (rc < 0)
+				ret_val = rc;
 			break;
 		case NETLBL_NLTYPE_UNLABELED:
 			netlbl_req_delattr(req);
-			ret_val = 0;
 			break;
 		default:
 			ret_val = -ENOENT;
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index b6eede4406bd..9fbf22a3ca57 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -358,6 +358,8 @@ int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
 	if (rc != 0)
 		goto inet_conn_request_return;
 	rc = netlbl_req_setattr(req, &secattr);
+	if (rc > 0)
+		rc = 0;
 inet_conn_request_return:
 	netlbl_secattr_destroy(&secattr);
 	return rc;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 20eed64e91de..086a3f696baa 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4060,6 +4060,8 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
 		rc = netlbl_req_setattr(req, &skp->smk_netlabel);
 	else
 		rc = netlbl_req_setattr(req, &smack_net_ambient->smk_netlabel);
+	if (rc >= 0)
+		return 0;
 
 	return rc;
 }
-- 
2.17.0

