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[CIFS] Warn on requesting default security (ntlm) on mount

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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 <[email protected]>
CC: Suresh Jayaraman <[email protected]>
Reviewed-by: Shirish Pargaonkar <[email protected]>
Signed-off-by: Steve French <[email protected]>
This commit is contained in:
Steve French 2011-04-12 01:24:57 +00:00
commit d9b9420137
1 changed files with 11 additions and 0 deletions
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11
fs/cifs/connect.c
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@ -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);