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authorStefan Metzmacher <metze@samba.org>2016-05-03 10:52:30 +0200
committerSasha Levin <sasha.levin@oracle.com>2016-06-06 19:12:24 -0400
commitf39b179308d938c7bb6da74fd0699c0eb4356ef8 (patch)
treeda6371aabc72e4b1bbe5ebbdc32f560155c5b49e /fs
parent9a2257ff4ccf1ccd1ed0446f9ff5813232594ffc (diff)
fs/cifs: correctly to anonymous authentication via NTLMSSP
[ Upstream commit cfda35d98298131bf38fbad3ce4cd5ecb3cf18db ] See [MS-NLMP] 3.2.5.1.2 Server Receives an AUTHENTICATE_MESSAGE from the Client: ... Set NullSession to FALSE If (AUTHENTICATE_MESSAGE.UserNameLen == 0 AND AUTHENTICATE_MESSAGE.NtChallengeResponse.Length == 0 AND (AUTHENTICATE_MESSAGE.LmChallengeResponse == Z(1) OR AUTHENTICATE_MESSAGE.LmChallengeResponse.Length == 0)) -- Special case: client requested anonymous authentication Set NullSession to TRUE ... Only server which map unknown users to guest will allow access using a non-null NTChallengeResponse. For Samba it's the "map to guest = bad user" option. BUG: https://bugzilla.samba.org/show_bug.cgi?id=11913 CC: Stable <stable@vger.kernel.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/sess.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index bce6fdcd5d48..abaeeab8793c 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -400,19 +400,27 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->LmChallengeResponse.MaximumLength = 0;
sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
- rc = setup_ntlmv2_rsp(ses, nls_cp);
- if (rc) {
- cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
- goto setup_ntlmv2_ret;
+ if (ses->user_name != NULL) {
+ rc = setup_ntlmv2_rsp(ses, nls_cp);
+ if (rc) {
+ cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
+ goto setup_ntlmv2_ret;
+ }
+ memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+ ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
+
+ sec_blob->NtChallengeResponse.Length =
+ cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ sec_blob->NtChallengeResponse.MaximumLength =
+ cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ } else {
+ /*
+ * don't send an NT Response for anonymous access
+ */
+ sec_blob->NtChallengeResponse.Length = 0;
+ sec_blob->NtChallengeResponse.MaximumLength = 0;
}
- memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
- ses->auth_key.len - CIFS_SESS_KEY_SIZE);
- tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
-
- sec_blob->NtChallengeResponse.Length =
- cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
- sec_blob->NtChallengeResponse.MaximumLength =
- cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
if (ses->domainName == NULL) {
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);