netdev - [PATCH net 2/4] security: call security_sctp_assoc_request in sctp_sf_do_5_1D

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Date:   Fri, 22 Oct 2021 02:36:10 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, selinux@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        James Morris <jmorris@...ei.org>,
        Paul Moore <paul@...l-moore.com>,
        Richard Haines <richard_c_haines@...nternet.com>,
        Ondrej Mosnacek <omosnace@...hat.com>
Subject: [PATCH net 2/4] security: call security_sctp_assoc_request in sctp_sf_do_5_1D_ce

The asoc created when receives the INIT chunk is a temporary one, it
will be delete after INIT_ACK chunk is replied. So for the real asoc
created in sctp_sf_do_5_1D_ce() when receives the COOKIE_ECHO chunk,
security_sctp_assoc_request() should also be called.

Fixes: 72e89f50084c ("security: Add support for SCTP security hooks")
Reported-by: Prashanth Prahlad <pprahlad@...hat.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 Documentation/security/SCTP.rst | 15 +++++++++------
 net/sctp/sm_statefuns.c         |  5 +++++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/Documentation/security/SCTP.rst b/Documentation/security/SCTP.rst
index 415b548d9ce0..9a38067762e5 100644
--- a/Documentation/security/SCTP.rst
+++ b/Documentation/security/SCTP.rst
@@ -151,9 +151,9 @@ establishing an association.
          INIT --------------------------------------------->
                                                    sctp_sf_do_5_1B_init()
                                                  Respond to an INIT chunk.
-                                             SCTP peer endpoint "A" is
-                                             asking for an association. Call
-                                             security_sctp_assoc_request()
+                                             SCTP peer endpoint "A" is asking
+                                             for an temporary association.
+                                             Call security_sctp_assoc_request()
                                              to set the peer label if first
                                              association.
                                              If not first association, check
@@ -163,9 +163,12 @@ establishing an association.
           |                                       discard the packet.
           |
     COOKIE ECHO ------------------------------------------>
-                                                          |
-                                                          |
-                                                          |
+                                                  sctp_sf_do_5_1D_ce()
+                                             Respond to an COOKIE ECHO chunk.
+                                             Confirm the cookie and create an
+                                             permanent association.
+                                             Call security_sctp_assoc_request() to
+                                             do the same as for INIT chunk Response.
           <------------------------------------------- COOKIE ACK
           |                                               |
     sctp_sf_do_5_1E_ca                                    |
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 3206374209bc..b818532c3fc2 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -781,6 +781,11 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
 		}
 	}
 
+	if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
+		sctp_association_free(new_asoc);
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
+	}
+
 	/* Delay state machine commands until later.
 	 *
 	 * Re-build the bind address for the association is done in
-- 
2.27.0