diff options
| author | Namjae Jeon <linkinjeon@kernel.org> | 2021-09-22 21:00:57 +0900 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2021-09-22 17:21:05 -0500 |
| commit | 18a015bccf9e8927008d0a255c9f14b8ec15a648 (patch) | |
| tree | 4ec713a6049d0090903a0ae37bfe4547d9fc7dc3 /fs/ksmbd/smb_common.c | |
| parent | 9f6323311c7064414bfd1edb28e0837baf6b3c7f (diff) | |
ksmbd: check protocol id in ksmbd_verify_smb_message()
When second smb2 pdu has invalid protocol id, ksmbd doesn't detect it
and allow to process smb2 request. This patch add the check it in
ksmbd_verify_smb_message() and don't use protocol id of smb2 request as
protocol id of response.
Reviewed-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Reviewed-by: Ralph Böhme <slow@samba.org>
Reported-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd/smb_common.c')
| -rw-r--r-- | fs/ksmbd/smb_common.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index 43d3123d8b62..40f4fafa2e11 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -129,16 +129,22 @@ int ksmbd_lookup_protocol_idx(char *str) * * check for valid smb signature and packet direction(request/response) * - * Return: 0 on success, otherwise 1 + * Return: 0 on success, otherwise -EINVAL */ int ksmbd_verify_smb_message(struct ksmbd_work *work) { - struct smb2_hdr *smb2_hdr = work->request_buf; + struct smb2_hdr *smb2_hdr = work->request_buf + work->next_smb2_rcv_hdr_off; + struct smb_hdr *hdr; if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER) return ksmbd_smb2_check_message(work); - return 0; + hdr = work->request_buf; + if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER && + hdr->Command == SMB_COM_NEGOTIATE) + return 0; + + return -EINVAL; } /** @@ -265,7 +271,6 @@ static int ksmbd_negotiate_smb_dialect(void *buf) return BAD_PROT_ID; } -#define SMB_COM_NEGOTIATE 0x72 int ksmbd_init_smb_server(struct ksmbd_work *work) { struct ksmbd_conn *conn = work->conn; |