From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
[ Upstream commit 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2 ]
This patch return STATUS_NOT_SUPPORTED if binding session is guest.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-20480
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ksmbd/smb2pdu.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 61d6d4b6b56ac..51d495688f45e 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1462,7 +1462,7 @@ static int ntlm_authenticate(struct ksmbd_work *work)
* 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;
}
@@ -1476,7 +1476,7 @@ static int ntlm_authenticate(struct ksmbd_work *work)
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;
@@ -1720,6 +1720,11 @@ int smb2_sess_setup(struct ksmbd_work *work)
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) &&
@@ -1831,6 +1836,8 @@ int smb2_sess_setup(struct ksmbd_work *work)
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;
--
2.39.2
