From: Marios Makassikis Date: Wed, 11 Jan 2023 16:39:02 +0000 (+0100) Subject: ksmbd: do not sign response to session request for guest login X-Git-Tag: v5.15.92~69 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=87a7f38a9058df1743963645c8afa2b6a58c6591;p=platform%2Fkernel%2Flinux-rpi.git ksmbd: do not sign response to session request for guest login commit 5fde3c21cf33830eda7bfd006dc7f4bf07ec9fe6 upstream. If ksmbd.mountd is configured to assign unknown users to the guest account ("map to guest = bad user" in the config), ksmbd signs the response. This is wrong according to MS-SMB2 3.3.5.5.3: 12. If the SMB2_SESSION_FLAG_IS_GUEST bit is not set in the SessionFlags field, and Session.IsAnonymous is FALSE, the server MUST sign the final session setup response before sending it to the client, as follows: [...] This fixes libsmb2 based applications failing to establish a session ("Wrong signature in received"). Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3") Cc: stable@vger.kernel.org Signed-off-by: Marios Makassikis Acked-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 65c85ca..ac029df 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -8613,6 +8613,7 @@ int smb3_decrypt_req(struct ksmbd_work *work) bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work) { struct ksmbd_conn *conn = work->conn; + struct ksmbd_session *sess = work->sess; struct smb2_hdr *rsp = work->response_buf; if (conn->dialect < SMB30_PROT_ID) @@ -8622,6 +8623,7 @@ bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work) rsp = ksmbd_resp_buf_next(work); if (le16_to_cpu(rsp->Command) == SMB2_SESSION_SETUP_HE && + sess->user && !user_guest(sess->user) && rsp->Status == STATUS_SUCCESS) return true; return false;