This is a note to let you know that I've just added the patch titled
ksmbd: fix multi session connection failure
to the 5.15-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-fix-multi-session-connection-failure.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a8bbd42d76ead12063d0340271c6043606a71c05
Author: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Wed Dec 15 14:57:27 2021 +0900
ksmbd: fix multi session connection failure
[ Upstream commit ce53d365378cde71bb6596d79c257e600d951d29 ]
When RSS mode is enable, windows client do simultaneously send several
session requests to server. There is racy issue using
sess->ntlmssp.cryptkey on N connection : 1 session. So authetication
failed using wrong cryptkey on some session. This patch move cryptkey
to ksmbd_conn structure to use each cryptkey on connection.
Tested-by: Ziwei Xie <zw.xie@xxxxxxxxxxxxx>
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Stable-dep-of: 7b4323373d84 ("ksmbd: fix deadlock in ksmbd_find_crypto_ctx()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ksmbd/auth.c b/fs/ksmbd/auth.c
index b962b16e5aeb7..4867da417c23a 100644
--- a/fs/ksmbd/auth.c
+++ b/fs/ksmbd/auth.c
@@ -215,7 +215,7 @@ static int calc_ntlmv2_hash(struct ksmbd_session *sess, char *ntlmv2_hash,
* Return: 0 on success, error number on error
*/
int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
- int blen, char *domain_name)
+ int blen, char *domain_name, char *cryptkey)
{
char ntlmv2_hash[CIFS_ENCPWD_SIZE];
char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE];
@@ -256,7 +256,7 @@ int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
goto out;
}
- memcpy(construct, sess->ntlmssp.cryptkey, CIFS_CRYPTO_KEY_SIZE);
+ memcpy(construct, cryptkey, CIFS_CRYPTO_KEY_SIZE);
memcpy(construct + CIFS_CRYPTO_KEY_SIZE, &ntlmv2->blob_signature, blen);
rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), construct, len);
@@ -295,7 +295,8 @@ int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
* Return: 0 on success, error number on error
*/
int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
- int blob_len, struct ksmbd_session *sess)
+ int blob_len, struct ksmbd_conn *conn,
+ struct ksmbd_session *sess)
{
char *domain_name;
unsigned int nt_off, dn_off;
@@ -325,7 +326,7 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
/* TODO : use domain name that imported from configuration file */
domain_name = smb_strndup_from_utf16((const char *)authblob + dn_off,
- dn_len, true, sess->conn->local_nls);
+ dn_len, true, conn->local_nls);
if (IS_ERR(domain_name))
return PTR_ERR(domain_name);
@@ -334,7 +335,7 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
domain_name);
ret = ksmbd_auth_ntlmv2(sess, (struct ntlmv2_resp *)((char *)authblob + nt_off),
nt_len - CIFS_ENCPWD_SIZE,
- domain_name);
+ domain_name, conn->ntlmssp.cryptkey);
kfree(domain_name);
return ret;
}
@@ -348,7 +349,7 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
*
*/
int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
- int blob_len, struct ksmbd_session *sess)
+ int blob_len, struct ksmbd_conn *conn)
{
if (blob_len < sizeof(struct negotiate_message)) {
ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
@@ -362,7 +363,7 @@ int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
return -EINVAL;
}
- sess->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
+ conn->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
return 0;
}
@@ -376,14 +377,14 @@ int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
*/
unsigned int
ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
- struct ksmbd_session *sess)
+ struct ksmbd_conn *conn)
{
struct target_info *tinfo;
wchar_t *name;
__u8 *target_name;
unsigned int flags, blob_off, blob_len, type, target_info_len = 0;
int len, uni_len, conv_len;
- int cflags = sess->ntlmssp.client_flags;
+ int cflags = conn->ntlmssp.client_flags;
memcpy(chgblob->Signature, NTLMSSP_SIGNATURE, 8);
chgblob->MessageType = NtLmChallenge;
@@ -404,7 +405,7 @@ ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
if (cflags & NTLMSSP_REQUEST_TARGET)
flags |= NTLMSSP_REQUEST_TARGET;
- if (sess->conn->use_spnego &&
+ if (conn->use_spnego &&
(cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC;
@@ -415,7 +416,7 @@ ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
return -ENOMEM;
conv_len = smb_strtoUTF16((__le16 *)name, ksmbd_netbios_name(), len,
- sess->conn->local_nls);
+ conn->local_nls);
if (conv_len < 0 || conv_len > len) {
kfree(name);
return -EINVAL;
@@ -431,8 +432,8 @@ ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
chgblob->TargetName.BufferOffset = cpu_to_le32(blob_off);
/* Initialize random conn challenge */
- get_random_bytes(sess->ntlmssp.cryptkey, sizeof(__u64));
- memcpy(chgblob->Challenge, sess->ntlmssp.cryptkey,
+ get_random_bytes(conn->ntlmssp.cryptkey, sizeof(__u64));
+ memcpy(chgblob->Challenge, conn->ntlmssp.cryptkey,
CIFS_CRYPTO_KEY_SIZE);
/* Add Target Information to security buffer */
diff --git a/fs/ksmbd/auth.h b/fs/ksmbd/auth.h
index 9c2d4badd05d1..95629651cf266 100644
--- a/fs/ksmbd/auth.h
+++ b/fs/ksmbd/auth.h
@@ -38,16 +38,16 @@ struct kvec;
int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
unsigned int nvec, int enc);
void ksmbd_copy_gss_neg_header(void *buf);
-int ksmbd_auth_ntlm(struct ksmbd_session *sess, char *pw_buf);
int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
- int blen, char *domain_name);
+ int blen, char *domain_name, char *cryptkey);
int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
- int blob_len, struct ksmbd_session *sess);
+ int blob_len, struct ksmbd_conn *conn,
+ struct ksmbd_session *sess);
int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
- int blob_len, struct ksmbd_session *sess);
+ int blob_len, struct ksmbd_conn *conn);
unsigned int
ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
- struct ksmbd_session *sess);
+ struct ksmbd_conn *conn);
int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob,
int in_len, char *out_blob, int *out_len);
int ksmbd_sign_smb2_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov,
diff --git a/fs/ksmbd/connection.h b/fs/ksmbd/connection.h
index 4b15c5e673d92..f3367d7760d7e 100644
--- a/fs/ksmbd/connection.h
+++ b/fs/ksmbd/connection.h
@@ -72,12 +72,7 @@ struct ksmbd_conn {
int connection_type;
struct ksmbd_stats stats;
char ClientGUID[SMB2_CLIENT_GUID_SIZE];
- union {
- /* pending trans request table */
- struct trans_state *recent_trans;
- /* Used by ntlmssp */
- char *ntlmssp_cryptkey;
- };
+ struct ntlmssp_auth ntlmssp;
spinlock_t llist_lock;
struct list_head lock_list;
diff --git a/fs/ksmbd/mgmt/user_session.h b/fs/ksmbd/mgmt/user_session.h
index 82289c3cbd2bc..e241f16a38512 100644
--- a/fs/ksmbd/mgmt/user_session.h
+++ b/fs/ksmbd/mgmt/user_session.h
@@ -45,7 +45,6 @@ struct ksmbd_session {
int state;
__u8 *Preauth_HashValue;
- struct ntlmssp_auth ntlmssp;
char sess_key[CIFS_KEY_SIZE];
struct hlist_node hlist;
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index c8c2b326ee042..bb8126deeaf29 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1316,7 +1316,7 @@ static int ntlm_negotiate(struct ksmbd_work *work,
int sz, rc;
ksmbd_debug(SMB, "negotiate phase\n");
- rc = ksmbd_decode_ntlmssp_neg_blob(negblob, negblob_len, work->sess);
+ rc = ksmbd_decode_ntlmssp_neg_blob(negblob, negblob_len, work->conn);
if (rc)
return rc;
@@ -1326,7 +1326,7 @@ static int ntlm_negotiate(struct ksmbd_work *work,
memset(chgblob, 0, sizeof(struct challenge_message));
if (!work->conn->use_spnego) {
- sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->sess);
+ sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->conn);
if (sz < 0)
return -ENOMEM;
@@ -1342,7 +1342,7 @@ static int ntlm_negotiate(struct ksmbd_work *work,
return -ENOMEM;
chgblob = (struct challenge_message *)neg_blob;
- sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->sess);
+ sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->conn);
if (sz < 0) {
rc = -ENOMEM;
goto out;
@@ -1480,7 +1480,7 @@ static int ntlm_authenticate(struct ksmbd_work *work)
authblob = user_authblob(conn, req);
sz = le16_to_cpu(req->SecurityBufferLength);
- rc = ksmbd_decode_ntlmssp_auth_blob(authblob, sz, sess);
+ rc = ksmbd_decode_ntlmssp_auth_blob(authblob, sz, conn, sess);
if (rc) {
set_user_flag(sess->user, KSMBD_USER_FLAG_BAD_PASSWORD);
ksmbd_debug(SMB, "authentication failed\n");
