From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Sun, 12 Apr 2020 16:09:26 +1000
Subject: [PATCH] cifs: dump the session id and keys also for SMB2 sessions
Git-commit: f560cda91bd59a872fe0e3217b74c3f33c131b50
References: bsc#1144333
Patch-mainline: v5.7-rc2

We already dump these keys for SMB3, lets also dump it for SMB2
sessions so that we can use the session key in wireshark to check and validate
that the signatures are correct.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
 fs/cifs/smb2pdu.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1529,6 +1529,21 @@ SMB2_sess_auth_rawntlmssp_authenticate(s
 	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 
 	rc = SMB2_sess_establish_session(sess_data);
+#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
+	if (ses->server->dialect < SMB30_PROT_ID) {
+		cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
+		/*
+		 * The session id is opaque in terms of endianness, so we can't
+		 * print it as a long long. we dump it as we got it on the wire
+		 */
+		cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
+			 &ses->Suid);
+		cifs_dbg(VFS, "Session Key   %*ph\n",
+			 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
+		cifs_dbg(VFS, "Signing Key   %*ph\n",
+			 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
+	}
+#endif
 out:
 	kfree(ntlmssp_blob);
 	SMB2_sess_free_buffer(sess_data);