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ksmbd: fix encryption failure issue for session logoff response 

If client send encrypted session logoff request on seal mount,
Encryption for that response fails.

ksmbd: Could not get encryption key
CIFS: VFS: cifs_put_smb_ses: Session Logoff failure rc=-512

Session lookup fails in ksmbd_get_encryption_key() because sess->state is
set to SMB2_SESSION_EXPIRED in session logoff. There is no need to do
session lookup again to encrypt the response. This patch change to use
ksmbd_session in ksmbd_work.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2022-09-22 23:36:34 +09:00 committed by Steve French
parent 360c8ee6fe
commit af705ef2b0
3 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/ksmbd/auth.c
View File

@ -984,13 +984,16 @@ out:
return rc;
}
static int ksmbd_get_encryption_key(struct ksmbd_conn *conn, __u64 ses_id,
static int ksmbd_get_encryption_key(struct ksmbd_work *work, __u64 ses_id,
int enc, u8 *key)
{
struct ksmbd_session *sess;
u8 *ses_enc_key;
sess = ksmbd_session_lookup_all(conn, ses_id);
if (enc)
sess = work->sess;
else
sess = ksmbd_session_lookup_all(work->conn, ses_id);
if (!sess)
return -EINVAL;
@ -1078,9 +1081,10 @@ static struct scatterlist *ksmbd_init_sg(struct kvec *iov, unsigned int nvec,
return sg;
}
int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
int ksmbd_crypt_message(struct ksmbd_work *work, struct kvec *iov,
unsigned int nvec, int enc)
{
struct ksmbd_conn *conn = work->conn;
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(iov[0].iov_base);
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
int rc;
@ -1094,7 +1098,7 @@ int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
struct ksmbd_crypto_ctx *ctx;
rc = ksmbd_get_encryption_key(conn,
rc = ksmbd_get_encryption_key(work,
le64_to_cpu(tr_hdr->SessionId),
enc,
key);

3
fs/ksmbd/auth.h
View File

@ -33,9 +33,10 @@
struct ksmbd_session;
struct ksmbd_conn;
struct ksmbd_work;
struct kvec;
int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
int ksmbd_crypt_message(struct ksmbd_work *work, struct kvec *iov,
unsigned int nvec, int enc);
void ksmbd_copy_gss_neg_header(void *buf);
int ksmbd_auth_ntlmv2(struct ksmbd_conn *conn, struct ksmbd_session *sess,

7
fs/ksmbd/smb2pdu.c
View File

@ -8589,7 +8589,7 @@ int smb3_encrypt_resp(struct ksmbd_work *work)
buf_size += iov[1].iov_len;
work->resp_hdr_sz = iov[1].iov_len;
rc = ksmbd_crypt_message(work->conn, iov, rq_nvec, 1);
rc = ksmbd_crypt_message(work, iov, rq_nvec, 1);
if (rc)
return rc;
@ -8608,7 +8608,6 @@ bool smb3_is_transform_hdr(void *buf)
int smb3_decrypt_req(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
struct ksmbd_session *sess;
char *buf = work->request_buf;
unsigned int pdu_length = get_rfc1002_len(buf);
@ -8628,7 +8627,7 @@ int smb3_decrypt_req(struct ksmbd_work *work)
return -ECONNABORTED;
}
sess = ksmbd_session_lookup_all(conn, le64_to_cpu(tr_hdr->SessionId));
sess = ksmbd_session_lookup_all(work->conn, le64_to_cpu(tr_hdr->SessionId));
if (!sess) {
pr_err("invalid session id(%llx) in transform header\n",
le64_to_cpu(tr_hdr->SessionId));
@ -8639,7 +8638,7 @@ int smb3_decrypt_req(struct ksmbd_work *work)
iov[0].iov_len = sizeof(struct smb2_transform_hdr) + 4;
iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr) + 4;
iov[1].iov_len = buf_data_size;
rc = ksmbd_crypt_message(conn, iov, 2, 0);
rc = ksmbd_crypt_message(work, iov, 2, 0);
if (rc)
return rc;