From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E19FF168C2 for ; Mon, 8 May 2023 10:22:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47AEAC4339B; Mon, 8 May 2023 10:22:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683541377; bh=H31vwZ0XZVomVXa/a0t0cVSLQoLFQwi7q5oYi3uUXrU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vgAsk27UJX4U9om0PfMK+wb2AtkjNzCFKk27hkYZkmH6P5PnFtp5CixvEI6pS6ATY q3vSa8l50bmNx/ZW8XNLEvAqHlBl4cLTISNtO3hzER1brW9Zlev1Hx6Qh/CBs8NOnp Pxy2FNOlmPkYXIKd4EggiqBHDcGQN6gIPH0q2sOA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Namjae Jeon , Steve French , zdi-disclosures@trendmicro.com Subject: [PATCH 6.2 094/663] ksmbd: not allow guest user on multichannel Date: Mon, 8 May 2023 11:38:40 +0200 Message-Id: <20230508094431.506208185@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Namjae Jeon commit 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2 upstream. This patch return STATUS_NOT_SUPPORTED if binding session is guest. Cc: stable@vger.kernel.org Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20480 Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/ksmbd/smb2pdu.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -1456,7 +1456,7 @@ static int ntlm_authenticate(struct ksmb * Reuse session if anonymous try to connect * on reauthetication. */ - if (ksmbd_anonymous_user(user)) { + if (conn->binding == false && ksmbd_anonymous_user(user)) { ksmbd_free_user(user); return 0; } @@ -1470,7 +1470,7 @@ static int ntlm_authenticate(struct ksmb sess->user = user; } - if (user_guest(sess->user)) { + if (conn->binding == false && user_guest(sess->user)) { rsp->SessionFlags = SMB2_SESSION_FLAG_IS_GUEST_LE; } else { struct authenticate_message *authblob; @@ -1715,6 +1715,11 @@ int smb2_sess_setup(struct ksmbd_work *w goto out_err; } + if (user_guest(sess->user)) { + rc = -EOPNOTSUPP; + goto out_err; + } + conn->binding = true; } else if ((conn->dialect < SMB30_PROT_ID || server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) && @@ -1827,6 +1832,8 @@ out_err: rsp->hdr.Status = STATUS_NETWORK_SESSION_EXPIRED; else if (rc == -ENOMEM) rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES; + else if (rc == -EOPNOTSUPP) + rsp->hdr.Status = STATUS_NOT_SUPPORTED; else if (rc) rsp->hdr.Status = STATUS_LOGON_FAILURE;