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authorSteve French <sfrench@us.ibm.com>2011-04-12 01:24:57 +0000
committerSteve French <sfrench@us.ibm.com>2011-04-12 01:27:45 +0000
commitd9b942013730c38ac83564d6669c6d0ecf6d754d (patch)
tree91dad22a8b0a6a39216a4d016e2822e70ae5edad
parentfd88ce9313e9f9d3b56eada7fc76a301828baefd (diff)
downloadop-kernel-dev-d9b942013730c38ac83564d6669c6d0ecf6d754d.zip
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[CIFS] Warn on requesting default security (ntlm) on mount
Warn once if default security (ntlm) requested. We will update the default to the stronger security mechanism (ntlmv2) in 2.6.41. Kerberos is also stronger than ntlm, but more servers support ntlmv2 and ntlmv2 does not require an upcall, so ntlmv2 is a better default. Reviewed-by: Jeff Layton <jlayton@redhat.com> CC: Suresh Jayaraman <sjayaraman@suse.de> Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/connect.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 8cf4a63..db9d55b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1854,6 +1854,8 @@ cifs_put_smb_ses(struct cifsSesInfo *ses)
cifs_put_tcp_session(server);
}
+static bool warned_on_ntlm; /* globals init to false automatically */
+
static struct cifsSesInfo *
cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
{
@@ -1928,6 +1930,15 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
}
ses->cred_uid = volume_info->cred_uid;
ses->linux_uid = volume_info->linux_uid;
+
+ /* ntlmv2 is much stronger than ntlm security, and has been broadly
+ supported for many years, time to update default security mechanism */
+ if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
+ warned_on_ntlm = true;
+ cERROR(1, "default security mechanism requested. The default "
+ "security mechanism will be upgraded from ntlm to "
+ "ntlmv2 in kernel release 2.6.41");
+ }
ses->overrideSecFlg = volume_info->secFlg;
mutex_lock(&ses->session_mutex);
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