This is a note to let you know that I've just added the patch titled
ksmbd: set SMB2_SESSION_FLAG_ENCRYPT_DATA when enforcing data encryption for this share
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ksmbd-set-smb2_session_flag_encrypt_data-when-enforc.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5a01e0a08c272f0d6e9802e4a9aade5f18bef742
Author: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Sun Dec 31 16:12:21 2023 +0900
ksmbd: set SMB2_SESSION_FLAG_ENCRYPT_DATA when enforcing data encryption for this share
[ Upstream commit 37ba7b005a7a4454046bd8659c7a9c5330552396 ]
Currently, SMB2_SESSION_FLAG_ENCRYPT_DATA is always set session setup
response. Since this forces data encryption from the client, there is a
problem that data is always encrypted regardless of the use of the cifs
seal mount option. SMB2_SESSION_FLAG_ENCRYPT_DATA should be set according
to KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION flags, and in case of
KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF, encryption mode is turned off for
all connections.
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/server/ksmbd_netlink.h b/fs/smb/server/ksmbd_netlink.h
index ce866ff159bfe..fb8b2d566efb6 100644
--- a/fs/smb/server/ksmbd_netlink.h
+++ b/fs/smb/server/ksmbd_netlink.h
@@ -74,6 +74,7 @@ struct ksmbd_heartbeat {
#define KSMBD_GLOBAL_FLAG_SMB2_LEASES BIT(0)
#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION BIT(1)
#define KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL BIT(2)
+#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF BIT(3)
/*
* IPC request for ksmbd server startup
diff --git a/fs/smb/server/smb2ops.c b/fs/smb/server/smb2ops.c
index ab23da2120b94..e401302478c36 100644
--- a/fs/smb/server/smb2ops.c
+++ b/fs/smb/server/smb2ops.c
@@ -247,8 +247,9 @@ void init_smb3_02_server(struct ksmbd_conn *conn)
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_LEASES)
conn->vals->capabilities |= SMB2_GLOBAL_CAP_LEASING;
- if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION &&
- conn->cli_cap & SMB2_GLOBAL_CAP_ENCRYPTION)
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION ||
+ (!(server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF) &&
+ conn->cli_cap & SMB2_GLOBAL_CAP_ENCRYPTION))
conn->vals->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL)
@@ -271,6 +272,11 @@ int init_smb3_11_server(struct ksmbd_conn *conn)
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_LEASES)
conn->vals->capabilities |= SMB2_GLOBAL_CAP_LEASING;
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION ||
+ (!(server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF) &&
+ conn->cli_cap & SMB2_GLOBAL_CAP_ENCRYPTION))
+ conn->vals->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
+
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL)
conn->vals->capabilities |= SMB2_GLOBAL_CAP_MULTI_CHANNEL;
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 3f4f6b0385655..f5a46b6831636 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -935,7 +935,7 @@ static void decode_encrypt_ctxt(struct ksmbd_conn *conn,
return;
}
- if (!(server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION))
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF)
return;
for (i = 0; i < cph_cnt; i++) {
@@ -1544,7 +1544,8 @@ static int ntlm_authenticate(struct ksmbd_work *work,
return -EINVAL;
}
sess->enc = true;
- rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION)
+ rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
/*
* signing is disable if encryption is enable
* on this session
@@ -1630,7 +1631,8 @@ static int krb5_authenticate(struct ksmbd_work *work,
return -EINVAL;
}
sess->enc = true;
- rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION)
+ rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
sess->sign = false;
}
