[PATCH v5 00/20] Buffer validation patches

[PATCH v5 00/20] Buffer validation patches

[Ralph Boehme]

v2:
  - update comments of smb2_get_data_area_len().
  - fix wrong buffer size check in fsctl_query_iface_info_ioctl().
  - fix 32bit overflow in smb2_set_info.

v3:
  - add buffer check for ByteCount of smb negotiate request.
  - Moved buffer check of to the top of loop to avoid unneeded behavior when
    out_buf_len is smaller than network_interface_info_ioctl_rsp.
  - get correct out_buf_len which doesn't exceed max stream protocol length.
  - subtract single smb2_lock_element for correct buffer size check in
    ksmbd_smb2_check_message().

v4: 
  - use work->response_sz for out_buf_len calculation in smb2_ioctl.
  - move smb2_neg size check to above to validate NegotiateContextOffset
    field.
  - remove unneeded dialect checks in smb2_sess_setup() and
    smb2_handle_negotiate().
  - split smb2_set_info patch into two patches(declaring
    smb2_file_basic_info and buffer check) 

v5:
  - remove PDU size validation from ksmbd_conn_handler_loop()
  - add PDU size validation to ksmbd_smb2_check_message()
  - fix compound non-related request handling

Hyunchul Lee (1):
  ksmbd: add buffer validation for SMB2_CREATE_CONTEXT

Namjae Jeon (9):
  ksmbd: add the check to vaildate if stream protocol length exceeds
    maximum value
  ksmbd: add validation in smb2_ioctl
  ksmbd: use correct basic info level in set_file_basic_info()
  ksmbd: add request buffer validation in smb2_set_info
  ksmbd: check strictly data area in ksmbd_smb2_check_message()
  ksmbd: add validation in smb2 negotiate
  ksmbd: remove the leftover of smb2.0 dialect support
  ksmbd: remove NTLMv1 authentication
  ksmbd: fix transform header validation

Ralph Boehme (10):
  ksmbd: use ksmbd_req_buf_next() in ksmbd_smb2_check_message()
  ksmbd: use ksmbd_req_buf_next() in ksmbd_verify_smb_message()
  ksmbd: remove ksmbd_verify_smb_message()
  ksmbd: add ksmbd_smb2_cur_pdu_buflen()
  ksmbd: use ksmbd_smb2_cur_pdu_buflen() in ksmbd_smb2_check_message()
  ksmbd: check PDU len is at least header plus body size in
    ksmbd_smb2_check_message()
  ksmdb: use cmd helper variable in smb2_get_ksmbd_tcon()
  ksmdb: make smb2_get_ksmbd_tcon() callable with chained PDUs
  ksmbd: make smb2_check_user_session() callabe for compound PDUs
  ksmdb: move session and tcon validation to ksmbd_smb2_check_message()

 fs/ksmbd/auth.c       | 205 ---------------------
 fs/ksmbd/connection.c |   9 +-
 fs/ksmbd/crypto_ctx.c |  16 --
 fs/ksmbd/crypto_ctx.h |   8 -
 fs/ksmbd/ksmbd_work.h |   1 +
 fs/ksmbd/oplock.c     |  41 ++++-
 fs/ksmbd/server.c     |  19 +-
 fs/ksmbd/smb2misc.c   | 164 ++++++++++-------
 fs/ksmbd/smb2ops.c    |   5 -
 fs/ksmbd/smb2pdu.c    | 411 ++++++++++++++++++++++++++++++------------
 fs/ksmbd/smb2pdu.h    |  11 +-
 fs/ksmbd/smb_common.c |  68 +++----
 fs/ksmbd/smb_common.h |   5 +-
 fs/ksmbd/smbacl.c     |  21 ++-
 fs/ksmbd/vfs.c        |   2 +-
 fs/ksmbd/vfs.h        |   2 +-
 16 files changed, 496 insertions(+), 492 deletions(-)

-- 
2.31.1

[PATCH v5 01/20] ksmbd: add the check to vaildate if stream protocol length exceeds maximum value

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

This patch add MAX_STREAM_PROT_LEN macro and check if stream protocol
length exceeds maximum value. opencode pdu size check in
ksmbd_pdu_size_has_room().

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/connection.c | 9 +++++----
 fs/ksmbd/smb_common.c | 6 ------
 fs/ksmbd/smb_common.h | 4 ++--
 3 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/fs/ksmbd/connection.c b/fs/ksmbd/connection.c
index af086d35398a..e50353c50661 100644
--- a/fs/ksmbd/connection.c
+++ b/fs/ksmbd/connection.c
@@ -296,10 +296,11 @@ int ksmbd_conn_handler_loop(void *p)
 		pdu_size = get_rfc1002_len(hdr_buf);
 		ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
 
-		/* make sure we have enough to get to SMB header end */
-		if (!ksmbd_pdu_size_has_room(pdu_size)) {
-			ksmbd_debug(CONN, "SMB request too short (%u bytes)\n",
-				    pdu_size);
+		/*
+		 * Check if pdu size is valid (min : smb header size,
+		 * max : 0x00FFFFFF).
+		 */
+		if (pdu_size > MAX_STREAM_PROT_LEN) {
 			continue;
 		}
 
diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index 5901b2884c60..20bd5b8e3c0a 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -21,7 +21,6 @@ static const char basechars[43] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
 #define MAGIC_CHAR '~'
 #define PERIOD '.'
 #define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
-#define KSMBD_MIN_SUPPORTED_HEADER_SIZE	(sizeof(struct smb2_hdr))
 
 struct smb_protocol {
 	int		index;
@@ -272,11 +271,6 @@ int ksmbd_init_smb_server(struct ksmbd_work *work)
 	return 0;
 }
 
-bool ksmbd_pdu_size_has_room(unsigned int pdu)
-{
-	return (pdu >= KSMBD_MIN_SUPPORTED_HEADER_SIZE - 4);
-}
-
 int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
 				      struct ksmbd_file *dir,
 				      struct ksmbd_dir_info *d_info,
diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h
index 994abede27e9..6e79e7577f6b 100644
--- a/fs/ksmbd/smb_common.h
+++ b/fs/ksmbd/smb_common.h
@@ -48,6 +48,8 @@
 #define CIFS_DEFAULT_IOSIZE	(64 * 1024)
 #define MAX_CIFS_SMALL_BUFFER_SIZE 448 /* big enough for most */
 
+#define MAX_STREAM_PROT_LEN	0x00FFFFFF
+
 /* Responses when opening a file. */
 #define F_SUPERSEDED	0
 #define F_OPENED	1
@@ -493,8 +495,6 @@ int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count);
 
 int ksmbd_init_smb_server(struct ksmbd_work *work);
 
-bool ksmbd_pdu_size_has_room(unsigned int pdu);
-
 struct ksmbd_kstat;
 int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work,
 				      int info_level,
-- 
2.31.1

[PATCH v5 02/20] ksmbd: add validation in smb2_ioctl

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Add validation for request/response buffer size check in smb2_ioctl and
fsctl_copychunk() take copychunk_ioctl_req pointer and the other arguments
instead of smb2_ioctl_req structure and remove an unused smb2_ioctl_req
argument of fsctl_validate_negotiate_info.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2pdu.c | 105 ++++++++++++++++++++++++++++++++++-----------
 fs/ksmbd/vfs.c     |   2 +-
 fs/ksmbd/vfs.h     |   2 +-
 3 files changed, 83 insertions(+), 26 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index cea376b2dd8f..9c0878862820 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6918,24 +6918,26 @@ int smb2_lock(struct ksmbd_work *work)
 	return err;
 }
 
-static int fsctl_copychunk(struct ksmbd_work *work, struct smb2_ioctl_req *req,
+static int fsctl_copychunk(struct ksmbd_work *work,
+			   struct copychunk_ioctl_req *ci_req,
+			   unsigned int cnt_code,
+			   unsigned int input_count,
+			   unsigned long long volatile_id,
+			   unsigned long long persistent_id,
 			   struct smb2_ioctl_rsp *rsp)
 {
-	struct copychunk_ioctl_req *ci_req;
 	struct copychunk_ioctl_rsp *ci_rsp;
 	struct ksmbd_file *src_fp = NULL, *dst_fp = NULL;
 	struct srv_copychunk *chunks;
 	unsigned int i, chunk_count, chunk_count_written = 0;
 	unsigned int chunk_size_written = 0;
 	loff_t total_size_written = 0;
-	int ret, cnt_code;
+	int ret = 0;
 
-	cnt_code = le32_to_cpu(req->CntCode);
-	ci_req = (struct copychunk_ioctl_req *)&req->Buffer[0];
 	ci_rsp = (struct copychunk_ioctl_rsp *)&rsp->Buffer[0];
 
-	rsp->VolatileFileId = req->VolatileFileId;
-	rsp->PersistentFileId = req->PersistentFileId;
+	rsp->VolatileFileId = cpu_to_le64(volatile_id);
+	rsp->PersistentFileId = cpu_to_le64(persistent_id);
 	ci_rsp->ChunksWritten =
 		cpu_to_le32(ksmbd_server_side_copy_max_chunk_count());
 	ci_rsp->ChunkBytesWritten =
@@ -6945,12 +6947,13 @@ static int fsctl_copychunk(struct ksmbd_work *work, struct smb2_ioctl_req *req,
 
 	chunks = (struct srv_copychunk *)&ci_req->Chunks[0];
 	chunk_count = le32_to_cpu(ci_req->ChunkCount);
+	if (chunk_count == 0)
+		goto out;
 	total_size_written = 0;
 
 	/* verify the SRV_COPYCHUNK_COPY packet */
 	if (chunk_count > ksmbd_server_side_copy_max_chunk_count() ||
-	    le32_to_cpu(req->InputCount) <
-	     offsetof(struct copychunk_ioctl_req, Chunks) +
+	    input_count < offsetof(struct copychunk_ioctl_req, Chunks) +
 	     chunk_count * sizeof(struct srv_copychunk)) {
 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
 		return -EINVAL;
@@ -6971,9 +6974,7 @@ static int fsctl_copychunk(struct ksmbd_work *work, struct smb2_ioctl_req *req,
 
 	src_fp = ksmbd_lookup_foreign_fd(work,
 					 le64_to_cpu(ci_req->ResumeKey[0]));
-	dst_fp = ksmbd_lookup_fd_slow(work,
-				      le64_to_cpu(req->VolatileFileId),
-				      le64_to_cpu(req->PersistentFileId));
+	dst_fp = ksmbd_lookup_fd_slow(work, volatile_id, persistent_id);
 	ret = -EINVAL;
 	if (!src_fp ||
 	    src_fp->persistent_id != le64_to_cpu(ci_req->ResumeKey[1])) {
@@ -7048,11 +7049,11 @@ static __be32 idev_ipv4_address(struct in_device *idev)
 }
 
 static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
-					struct smb2_ioctl_req *req,
-					struct smb2_ioctl_rsp *rsp)
+					struct smb2_ioctl_rsp *rsp,
+					unsigned int out_buf_len)
 {
 	struct network_interface_info_ioctl_rsp *nii_rsp = NULL;
-	int nbytes = 0;
+	unsigned int nbytes = 0;
 	struct net_device *netdev;
 	struct sockaddr_storage_rsp *sockaddr_storage;
 	unsigned int flags;
@@ -7061,6 +7062,10 @@ static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
 
 	rtnl_lock();
 	for_each_netdev(&init_net, netdev) {
+		if (out_buf_len <
+		    nbytes + sizeof(struct network_interface_info_ioctl_rsp))
+			break;
+
 		if (netdev->type == ARPHRD_LOOPBACK)
 			continue;
 
@@ -7132,6 +7137,8 @@ static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
 			sockaddr_storage->addr6.ScopeId = 0;
 		}
 
+		if (out_buf_len - nbytes < sizeof(struct network_interface_info_ioctl_rsp))
+			break;
 		nbytes += sizeof(struct network_interface_info_ioctl_rsp);
 	}
 	rtnl_unlock();
@@ -7152,11 +7159,16 @@ static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
 
 static int fsctl_validate_negotiate_info(struct ksmbd_conn *conn,
 					 struct validate_negotiate_info_req *neg_req,
-					 struct validate_negotiate_info_rsp *neg_rsp)
+					 struct validate_negotiate_info_rsp *neg_rsp,
+					 unsigned int in_buf_len)
 {
 	int ret = 0;
 	int dialect;
 
+	if (in_buf_len < sizeof(struct validate_negotiate_info_req) +
+			le16_to_cpu(neg_req->DialectCount) * sizeof(__le16))
+		return -EINVAL;
+
 	dialect = ksmbd_lookup_dialect_by_id(neg_req->Dialects,
 					     neg_req->DialectCount);
 	if (dialect == BAD_PROT_ID || dialect != conn->dialect) {
@@ -7190,7 +7202,7 @@ static int fsctl_validate_negotiate_info(struct ksmbd_conn *conn,
 static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
 					struct file_allocated_range_buffer *qar_req,
 					struct file_allocated_range_buffer *qar_rsp,
-					int in_count, int *out_count)
+					unsigned int in_count, unsigned int *out_count)
 {
 	struct ksmbd_file *fp;
 	loff_t start, length;
@@ -7217,7 +7229,8 @@ static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
 }
 
 static int fsctl_pipe_transceive(struct ksmbd_work *work, u64 id,
-				 int out_buf_len, struct smb2_ioctl_req *req,
+				 unsigned int out_buf_len,
+				 struct smb2_ioctl_req *req,
 				 struct smb2_ioctl_rsp *rsp)
 {
 	struct ksmbd_rpc_command *rpc_resp;
@@ -7331,8 +7344,7 @@ int smb2_ioctl(struct ksmbd_work *work)
 {
 	struct smb2_ioctl_req *req;
 	struct smb2_ioctl_rsp *rsp, *rsp_org;
-	int cnt_code, nbytes = 0;
-	int out_buf_len;
+	unsigned int cnt_code, nbytes = 0, out_buf_len, in_buf_len;
 	u64 id = KSMBD_NO_FID;
 	struct ksmbd_conn *conn = work->conn;
 	int ret = 0;
@@ -7361,7 +7373,11 @@ int smb2_ioctl(struct ksmbd_work *work)
 
 	cnt_code = le32_to_cpu(req->CntCode);
 	out_buf_len = le32_to_cpu(req->MaxOutputResponse);
-	out_buf_len = min(KSMBD_IPC_MAX_PAYLOAD, out_buf_len);
+	out_buf_len =
+		min_t(u32, work->response_sz - work->next_smb2_rsp_hdr_off -
+				(offsetof(struct smb2_ioctl_rsp, Buffer) - 4),
+		      out_buf_len);
+	in_buf_len = le32_to_cpu(req->InputCount);
 
 	switch (cnt_code) {
 	case FSCTL_DFS_GET_REFERRALS:
@@ -7389,6 +7405,7 @@ int smb2_ioctl(struct ksmbd_work *work)
 		break;
 	}
 	case FSCTL_PIPE_TRANSCEIVE:
+		out_buf_len = min_t(u32, KSMBD_IPC_MAX_PAYLOAD, out_buf_len);
 		nbytes = fsctl_pipe_transceive(work, id, out_buf_len, req, rsp);
 		break;
 	case FSCTL_VALIDATE_NEGOTIATE_INFO:
@@ -7397,9 +7414,16 @@ int smb2_ioctl(struct ksmbd_work *work)
 			goto out;
 		}
 
+		if (in_buf_len < sizeof(struct validate_negotiate_info_req))
+			return -EINVAL;
+
+		if (out_buf_len < sizeof(struct validate_negotiate_info_rsp))
+			return -EINVAL;
+
 		ret = fsctl_validate_negotiate_info(conn,
 			(struct validate_negotiate_info_req *)&req->Buffer[0],
-			(struct validate_negotiate_info_rsp *)&rsp->Buffer[0]);
+			(struct validate_negotiate_info_rsp *)&rsp->Buffer[0],
+			in_buf_len);
 		if (ret < 0)
 			goto out;
 
@@ -7408,7 +7432,7 @@ int smb2_ioctl(struct ksmbd_work *work)
 		rsp->VolatileFileId = cpu_to_le64(SMB2_NO_FID);
 		break;
 	case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
-		nbytes = fsctl_query_iface_info_ioctl(conn, req, rsp);
+		nbytes = fsctl_query_iface_info_ioctl(conn, rsp, out_buf_len);
 		if (nbytes < 0)
 			goto out;
 		break;
@@ -7435,15 +7459,33 @@ int smb2_ioctl(struct ksmbd_work *work)
 			goto out;
 		}
 
+		if (in_buf_len < sizeof(struct copychunk_ioctl_req)) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		if (out_buf_len < sizeof(struct copychunk_ioctl_rsp)) {
 			ret = -EINVAL;
 			goto out;
 		}
 
 		nbytes = sizeof(struct copychunk_ioctl_rsp);
-		fsctl_copychunk(work, req, rsp);
+		rsp->VolatileFileId = req->VolatileFileId;
+		rsp->PersistentFileId = req->PersistentFileId;
+		fsctl_copychunk(work,
+				(struct copychunk_ioctl_req *)&req->Buffer[0],
+				le32_to_cpu(req->CntCode),
+				le32_to_cpu(req->InputCount),
+				le64_to_cpu(req->VolatileFileId),
+				le64_to_cpu(req->PersistentFileId),
+				rsp);
 		break;
 	case FSCTL_SET_SPARSE:
+		if (in_buf_len < sizeof(struct file_sparse)) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		ret = fsctl_set_sparse(work, id,
 				       (struct file_sparse *)&req->Buffer[0]);
 		if (ret < 0)
@@ -7462,6 +7504,11 @@ int smb2_ioctl(struct ksmbd_work *work)
 			goto out;
 		}
 
+		if (in_buf_len < sizeof(struct file_zero_data_information)) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		zero_data =
 			(struct file_zero_data_information *)&req->Buffer[0];
 
@@ -7481,6 +7528,11 @@ int smb2_ioctl(struct ksmbd_work *work)
 		break;
 	}
 	case FSCTL_QUERY_ALLOCATED_RANGES:
+		if (in_buf_len < sizeof(struct file_allocated_range_buffer)) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		ret = fsctl_query_allocated_ranges(work, id,
 			(struct file_allocated_range_buffer *)&req->Buffer[0],
 			(struct file_allocated_range_buffer *)&rsp->Buffer[0],
@@ -7521,6 +7573,11 @@ int smb2_ioctl(struct ksmbd_work *work)
 		struct duplicate_extents_to_file *dup_ext;
 		loff_t src_off, dst_off, length, cloned;
 
+		if (in_buf_len < sizeof(struct duplicate_extents_to_file)) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		dup_ext = (struct duplicate_extents_to_file *)&req->Buffer[0];
 
 		fp_in = ksmbd_lookup_fd_slow(work, dup_ext->VolatileFileHandle,
diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index b41954294d38..835b384b0895 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -1023,7 +1023,7 @@ int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 
 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 			 struct file_allocated_range_buffer *ranges,
-			 int in_count, int *out_count)
+			 unsigned int in_count, unsigned int *out_count)
 {
 	struct file *f = fp->filp;
 	struct inode *inode = file_inode(fp->filp);
diff --git a/fs/ksmbd/vfs.h b/fs/ksmbd/vfs.h
index 7b1dcaa3fbdc..b0d5b8feb4a3 100644
--- a/fs/ksmbd/vfs.h
+++ b/fs/ksmbd/vfs.h
@@ -166,7 +166,7 @@ int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 struct file_allocated_range_buffer;
 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 			 struct file_allocated_range_buffer *ranges,
-			 int in_count, int *out_count);
+			 unsigned int in_count, unsigned int *out_count);
 int ksmbd_vfs_unlink(struct user_namespace *user_ns,
 		     struct dentry *dir, struct dentry *dentry);
 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat);
-- 
2.31.1

[PATCH v5 03/20] ksmbd: use correct basic info level in set_file_basic_info()

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Use correct basic info level in set/get_file_basic_info().

Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2pdu.c | 13 ++++++-------
 fs/ksmbd/smb2pdu.h |  9 +++++++++
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 9c0878862820..d874813aca90 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4161,7 +4161,7 @@ static void get_file_access_info(struct smb2_query_info_rsp *rsp,
 static int get_file_basic_info(struct smb2_query_info_rsp *rsp,
 			       struct ksmbd_file *fp, void *rsp_org)
 {
-	struct smb2_file_all_info *basic_info;
+	struct smb2_file_basic_info *basic_info;
 	struct kstat stat;
 	u64 time;
 
@@ -4171,7 +4171,7 @@ static int get_file_basic_info(struct smb2_query_info_rsp *rsp,
 		return -EACCES;
 	}
 
-	basic_info = (struct smb2_file_all_info *)rsp->Buffer;
+	basic_info = (struct smb2_file_basic_info *)rsp->Buffer;
 	generic_fillattr(file_mnt_user_ns(fp->filp), file_inode(fp->filp),
 			 &stat);
 	basic_info->CreationTime = cpu_to_le64(fp->create_time);
@@ -4184,9 +4184,8 @@ static int get_file_basic_info(struct smb2_query_info_rsp *rsp,
 	basic_info->Attributes = fp->f_ci->m_fattr;
 	basic_info->Pad1 = 0;
 	rsp->OutputBufferLength =
-		cpu_to_le32(offsetof(struct smb2_file_all_info, AllocationSize));
-	inc_rfc1001_len(rsp_org, offsetof(struct smb2_file_all_info,
-					  AllocationSize));
+		cpu_to_le32(sizeof(struct smb2_file_basic_info));
+	inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_basic_info));
 	return 0;
 }
 
@@ -5412,7 +5411,7 @@ static int smb2_create_link(struct ksmbd_work *work,
 static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
 			       struct ksmbd_share_config *share)
 {
-	struct smb2_file_all_info *file_info;
+	struct smb2_file_basic_info *file_info;
 	struct iattr attrs;
 	struct timespec64 ctime;
 	struct file *filp;
@@ -5423,7 +5422,7 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
 	if (!(fp->daccess & FILE_WRITE_ATTRIBUTES_LE))
 		return -EACCES;
 
-	file_info = (struct smb2_file_all_info *)buf;
+	file_info = (struct smb2_file_basic_info *)buf;
 	attrs.ia_valid = 0;
 	filp = fp->filp;
 	inode = file_inode(filp);
diff --git a/fs/ksmbd/smb2pdu.h b/fs/ksmbd/smb2pdu.h
index bcec845b03f3..261825d06391 100644
--- a/fs/ksmbd/smb2pdu.h
+++ b/fs/ksmbd/smb2pdu.h
@@ -1464,6 +1464,15 @@ struct smb2_file_all_info { /* data block encoding of response to level 18 */
 	char   FileName[1];
 } __packed; /* level 18 Query */
 
+struct smb2_file_basic_info { /* data block encoding of response to level 18 */
+	__le64 CreationTime;	/* Beginning of FILE_BASIC_INFO equivalent */
+	__le64 LastAccessTime;
+	__le64 LastWriteTime;
+	__le64 ChangeTime;
+	__le32 Attributes;
+	__u32  Pad1;		/* End of FILE_BASIC_INFO_INFO equivalent */
+} __packed;
+
 struct smb2_file_alt_name_info {
 	__le32 FileNameLength;
 	char FileName[0];
-- 
2.31.1

[PATCH v5 04/20] ksmbd: add request buffer validation in smb2_set_info

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Add buffer validation in smb2_set_info, and remove unused variable
in set_file_basic_info. and smb2_set_info infolevel functions take
structure pointer argument.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Hyunchul Lee <hyc.lee@gmail.com>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2pdu.c | 149 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 107 insertions(+), 42 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index d874813aca90..c434390ffcae 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2102,16 +2102,22 @@ static noinline int create_smb2_pipe(struct ksmbd_work *work)
  * smb2_set_ea() - handler for setting extended attributes using set
  *		info command
  * @eabuf:	set info command buffer
+ * @buf_len:	set info command buffer length
  * @path:	dentry path for get ea
  *
  * Return:	0 on success, otherwise error
  */
-static int smb2_set_ea(struct smb2_ea_info *eabuf, struct path *path)
+static int smb2_set_ea(struct smb2_ea_info *eabuf, unsigned int buf_len,
+		       struct path *path)
 {
 	struct user_namespace *user_ns = mnt_user_ns(path->mnt);
 	char *attr_name = NULL, *value;
 	int rc = 0;
-	int next = 0;
+	unsigned int next = 0;
+
+	if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength +
+			le16_to_cpu(eabuf->EaValueLength))
+		return -EINVAL;
 
 	attr_name = kmalloc(XATTR_NAME_MAX + 1, GFP_KERNEL);
 	if (!attr_name)
@@ -2176,7 +2182,13 @@ static int smb2_set_ea(struct smb2_ea_info *eabuf, struct path *path)
 
 next:
 		next = le32_to_cpu(eabuf->NextEntryOffset);
+		if (next == 0 || buf_len < next)
+			break;
+		buf_len -= next;
 		eabuf = (struct smb2_ea_info *)((char *)eabuf + next);
+		if (next < (u32)eabuf->EaNameLength + le16_to_cpu(eabuf->EaValueLength))
+			break;
+
 	} while (next != 0);
 
 	kfree(attr_name);
@@ -2757,7 +2769,15 @@ int smb2_open(struct ksmbd_work *work)
 		created = true;
 		user_ns = mnt_user_ns(path.mnt);
 		if (ea_buf) {
-			rc = smb2_set_ea(&ea_buf->ea, &path);
+			if (le32_to_cpu(ea_buf->ccontext.DataLength) <
+			    sizeof(struct smb2_ea_info)) {
+				rc = -EINVAL;
+				goto err_out;
+			}
+
+			rc = smb2_set_ea(&ea_buf->ea,
+					 le32_to_cpu(ea_buf->ccontext.DataLength),
+					 &path);
 			if (rc == -EOPNOTSUPP)
 				rc = 0;
 			else if (rc)
@@ -5341,7 +5361,7 @@ static int smb2_rename(struct ksmbd_work *work,
 static int smb2_create_link(struct ksmbd_work *work,
 			    struct ksmbd_share_config *share,
 			    struct smb2_file_link_info *file_info,
-			    struct file *filp,
+			    unsigned int buf_len, struct file *filp,
 			    struct nls_table *local_nls)
 {
 	char *link_name = NULL, *target_name = NULL, *pathname = NULL;
@@ -5349,6 +5369,10 @@ static int smb2_create_link(struct ksmbd_work *work,
 	bool file_present = true;
 	int rc;
 
+	if (buf_len < (u64)sizeof(struct smb2_file_link_info) +
+			le32_to_cpu(file_info->FileNameLength))
+		return -EINVAL;
+
 	ksmbd_debug(SMB, "setting FILE_LINK_INFORMATION\n");
 	pathname = kmalloc(PATH_MAX, GFP_KERNEL);
 	if (!pathname)
@@ -5408,10 +5432,10 @@ static int smb2_create_link(struct ksmbd_work *work,
 	return rc;
 }
 
-static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
+static int set_file_basic_info(struct ksmbd_file *fp,
+			       struct smb2_file_basic_info *file_info,
 			       struct ksmbd_share_config *share)
 {
-	struct smb2_file_basic_info *file_info;
 	struct iattr attrs;
 	struct timespec64 ctime;
 	struct file *filp;
@@ -5422,7 +5446,6 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
 	if (!(fp->daccess & FILE_WRITE_ATTRIBUTES_LE))
 		return -EACCES;
 
-	file_info = (struct smb2_file_basic_info *)buf;
 	attrs.ia_valid = 0;
 	filp = fp->filp;
 	inode = file_inode(filp);
@@ -5499,7 +5522,8 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
 }
 
 static int set_file_allocation_info(struct ksmbd_work *work,
-				    struct ksmbd_file *fp, char *buf)
+				    struct ksmbd_file *fp,
+				    struct smb2_file_alloc_info *file_alloc_info)
 {
 	/*
 	 * TODO : It's working fine only when store dos attributes
@@ -5507,7 +5531,6 @@ static int set_file_allocation_info(struct ksmbd_work *work,
 	 * properly with any smb.conf option
 	 */
 
-	struct smb2_file_alloc_info *file_alloc_info;
 	loff_t alloc_blks;
 	struct inode *inode;
 	int rc;
@@ -5515,7 +5538,6 @@ static int set_file_allocation_info(struct ksmbd_work *work,
 	if (!(fp->daccess & FILE_WRITE_DATA_LE))
 		return -EACCES;
 
-	file_alloc_info = (struct smb2_file_alloc_info *)buf;
 	alloc_blks = (le64_to_cpu(file_alloc_info->AllocationSize) + 511) >> 9;
 	inode = file_inode(fp->filp);
 
@@ -5551,9 +5573,8 @@ static int set_file_allocation_info(struct ksmbd_work *work,
 }
 
 static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
-				char *buf)
+				struct smb2_file_eof_info *file_eof_info)
 {
-	struct smb2_file_eof_info *file_eof_info;
 	loff_t newsize;
 	struct inode *inode;
 	int rc;
@@ -5561,7 +5582,6 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
 	if (!(fp->daccess & FILE_WRITE_DATA_LE))
 		return -EACCES;
 
-	file_eof_info = (struct smb2_file_eof_info *)buf;
 	newsize = le64_to_cpu(file_eof_info->EndOfFile);
 	inode = file_inode(fp->filp);
 
@@ -5588,7 +5608,8 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
 }
 
 static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
-			   char *buf)
+			   struct smb2_file_rename_info *rename_info,
+			   unsigned int buf_len)
 {
 	struct user_namespace *user_ns;
 	struct ksmbd_file *parent_fp;
@@ -5601,6 +5622,10 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
 		return -EACCES;
 	}
 
+	if (buf_len < (u64)sizeof(struct smb2_file_rename_info) +
+			le32_to_cpu(rename_info->FileNameLength))
+		return -EINVAL;
+
 	user_ns = file_mnt_user_ns(fp->filp);
 	if (ksmbd_stream_fd(fp))
 		goto next;
@@ -5623,14 +5648,13 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
 		}
 	}
 next:
-	return smb2_rename(work, fp, user_ns,
-			   (struct smb2_file_rename_info *)buf,
+	return smb2_rename(work, fp, user_ns, rename_info,
 			   work->sess->conn->local_nls);
 }
 
-static int set_file_disposition_info(struct ksmbd_file *fp, char *buf)
+static int set_file_disposition_info(struct ksmbd_file *fp,
+				     struct smb2_file_disposition_info *file_info)
 {
-	struct smb2_file_disposition_info *file_info;
 	struct inode *inode;
 
 	if (!(fp->daccess & FILE_DELETE_LE)) {
@@ -5639,7 +5663,6 @@ static int set_file_disposition_info(struct ksmbd_file *fp, char *buf)
 	}
 
 	inode = file_inode(fp->filp);
-	file_info = (struct smb2_file_disposition_info *)buf;
 	if (file_info->DeletePending) {
 		if (S_ISDIR(inode->i_mode) &&
 		    ksmbd_vfs_empty_dir(fp) == -ENOTEMPTY)
@@ -5651,15 +5674,14 @@ static int set_file_disposition_info(struct ksmbd_file *fp, char *buf)
 	return 0;
 }
 
-static int set_file_position_info(struct ksmbd_file *fp, char *buf)
+static int set_file_position_info(struct ksmbd_file *fp,
+				  struct smb2_file_pos_info *file_info)
 {
-	struct smb2_file_pos_info *file_info;
 	loff_t current_byte_offset;
 	unsigned long sector_size;
 	struct inode *inode;
 
 	inode = file_inode(fp->filp);
-	file_info = (struct smb2_file_pos_info *)buf;
 	current_byte_offset = le64_to_cpu(file_info->CurrentByteOffset);
 	sector_size = inode->i_sb->s_blocksize;
 
@@ -5675,12 +5697,11 @@ static int set_file_position_info(struct ksmbd_file *fp, char *buf)
 	return 0;
 }
 
-static int set_file_mode_info(struct ksmbd_file *fp, char *buf)
+static int set_file_mode_info(struct ksmbd_file *fp,
+			      struct smb2_file_mode_info *file_info)
 {
-	struct smb2_file_mode_info *file_info;
 	__le32 mode;
 
-	file_info = (struct smb2_file_mode_info *)buf;
 	mode = file_info->Mode;
 
 	if ((mode & ~FILE_MODE_INFO_MASK) ||
@@ -5710,40 +5731,74 @@ static int set_file_mode_info(struct ksmbd_file *fp, char *buf)
  * TODO: need to implement an error handling for STATUS_INFO_LENGTH_MISMATCH
  */
 static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
-			      int info_class, char *buf,
+			      struct smb2_set_info_req *req,
 			      struct ksmbd_share_config *share)
 {
-	switch (info_class) {
+	unsigned int buf_len = le32_to_cpu(req->BufferLength);
+
+	switch (req->FileInfoClass) {
 	case FILE_BASIC_INFORMATION:
-		return set_file_basic_info(fp, buf, share);
+	{
+		if (buf_len < sizeof(struct smb2_file_basic_info))
+			return -EINVAL;
 
+		return set_file_basic_info(fp, (struct smb2_file_basic_info *)req->Buffer, share);
+	}
 	case FILE_ALLOCATION_INFORMATION:
-		return set_file_allocation_info(work, fp, buf);
+	{
+		if (buf_len < sizeof(struct smb2_file_alloc_info))
+			return -EINVAL;
 
+		return set_file_allocation_info(work, fp,
+						(struct smb2_file_alloc_info *)req->Buffer);
+	}
 	case FILE_END_OF_FILE_INFORMATION:
-		return set_end_of_file_info(work, fp, buf);
+	{
+		if (buf_len < sizeof(struct smb2_file_eof_info))
+			return -EINVAL;
 
+		return set_end_of_file_info(work, fp,
+					    (struct smb2_file_eof_info *)req->Buffer);
+	}
 	case FILE_RENAME_INFORMATION:
+	{
 		if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
 			ksmbd_debug(SMB,
 				    "User does not have write permission\n");
 			return -EACCES;
 		}
-		return set_rename_info(work, fp, buf);
 
+		if (buf_len < sizeof(struct smb2_file_rename_info))
+			return -EINVAL;
+
+		return set_rename_info(work, fp,
+				       (struct smb2_file_rename_info *)req->Buffer,
+				       buf_len);
+	}
 	case FILE_LINK_INFORMATION:
+	{
+		if (buf_len < sizeof(struct smb2_file_link_info))
+			return -EINVAL;
+
 		return smb2_create_link(work, work->tcon->share_conf,
-					(struct smb2_file_link_info *)buf, fp->filp,
+					(struct smb2_file_link_info *)req->Buffer,
+					buf_len, fp->filp,
 					work->sess->conn->local_nls);
-
+	}
 	case FILE_DISPOSITION_INFORMATION:
+	{
 		if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
 			ksmbd_debug(SMB,
 				    "User does not have write permission\n");
 			return -EACCES;
 		}
-		return set_file_disposition_info(fp, buf);
 
+		if (buf_len < sizeof(struct smb2_file_disposition_info))
+			return -EINVAL;
+
+		return set_file_disposition_info(fp,
+						 (struct smb2_file_disposition_info *)req->Buffer);
+	}
 	case FILE_FULL_EA_INFORMATION:
 	{
 		if (!(fp->daccess & FILE_WRITE_EA_LE)) {
@@ -5752,18 +5807,29 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
 			return -EACCES;
 		}
 
-		return smb2_set_ea((struct smb2_ea_info *)buf,
-				   &fp->filp->f_path);
-	}
+		if (buf_len < sizeof(struct smb2_ea_info))
+			return -EINVAL;
 
+		return smb2_set_ea((struct smb2_ea_info *)req->Buffer,
+				   buf_len, &fp->filp->f_path);
+	}
 	case FILE_POSITION_INFORMATION:
-		return set_file_position_info(fp, buf);
+	{
+		if (buf_len < sizeof(struct smb2_file_pos_info))
+			return -EINVAL;
 
+		return set_file_position_info(fp, (struct smb2_file_pos_info *)req->Buffer);
+	}
 	case FILE_MODE_INFORMATION:
-		return set_file_mode_info(fp, buf);
+	{
+		if (buf_len < sizeof(struct smb2_file_mode_info))
+			return -EINVAL;
+
+		return set_file_mode_info(fp, (struct smb2_file_mode_info *)req->Buffer);
+	}
 	}
 
-	pr_err("Unimplemented Fileinfoclass :%d\n", info_class);
+	pr_err("Unimplemented Fileinfoclass :%d\n", req->FileInfoClass);
 	return -EOPNOTSUPP;
 }
 
@@ -5824,8 +5890,7 @@ int smb2_set_info(struct ksmbd_work *work)
 	switch (req->InfoType) {
 	case SMB2_O_INFO_FILE:
 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
-		rc = smb2_set_info_file(work, fp, req->FileInfoClass,
-					req->Buffer, work->tcon->share_conf);
+		rc = smb2_set_info_file(work, fp, req, work->tcon->share_conf);
 		break;
 	case SMB2_O_INFO_SECURITY:
 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
-- 
2.31.1

[PATCH v5 05/20] ksmbd: check strictly data area in ksmbd_smb2_check_message()

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

When invalid data offset and data length in request,
ksmbd_smb2_check_message check strictly and doesn't allow to process such
requests.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Hyunchul Lee <hyc.lee@gmail.com>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2misc.c | 98 ++++++++++++++++++++++-----------------------
 1 file changed, 47 insertions(+), 51 deletions(-)

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 9aa46bb3e10d..9edd9c161b27 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -80,18 +80,21 @@ static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 };
 
 /*
- * Returns the pointer to the beginning of the data area. Length of the data
- * area and the offset to it (from the beginning of the smb are also returned.
+ * Set length of the data area and the offset to arguments.
+ * if they are invalid, return error.
  */
-static char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
+static int smb2_get_data_area_len(unsigned int *off, unsigned int *len,
+				  struct smb2_hdr *hdr)
 {
+	int ret = 0;
+
 	*off = 0;
 	*len = 0;
 
 	/* error reqeusts do not have data area */
 	if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 	    (((struct smb2_err_rsp *)hdr)->StructureSize) == SMB2_ERROR_STRUCTURE_SIZE2_LE)
-		return NULL;
+		return ret;
 
 	/*
 	 * Following commands have data areas so we have to get the location
@@ -165,69 +168,60 @@ static char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 	case SMB2_IOCTL:
 		*off = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset);
 		*len = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputCount);
-
 		break;
 	default:
 		ksmbd_debug(SMB, "no length check for command\n");
 		break;
 	}
 
-	/*
-	 * Invalid length or offset probably means data area is invalid, but
-	 * we have little choice but to ignore the data area in this case.
-	 */
 	if (*off > 4096) {
-		ksmbd_debug(SMB, "offset %d too large, data area ignored\n",
-			    *off);
-		*len = 0;
-		*off = 0;
-	} else if (*off < 0) {
-		ksmbd_debug(SMB,
-			    "negative offset %d to data invalid ignore data area\n",
-			    *off);
-		*off = 0;
-		*len = 0;
-	} else if (*len < 0) {
-		ksmbd_debug(SMB,
-			    "negative data length %d invalid, data area ignored\n",
-			    *len);
-		*len = 0;
-	} else if (*len > 128 * 1024) {
-		ksmbd_debug(SMB, "data area larger than 128K: %d\n", *len);
-		*len = 0;
+		ksmbd_debug(SMB, "offset %d too large\n", *off);
+		ret = -EINVAL;
+	} else if ((u64)*off + *len > MAX_STREAM_PROT_LEN) {
+		ksmbd_debug(SMB, "Request is larger than maximum stream protocol length(%u): %llu\n",
+			    MAX_STREAM_PROT_LEN, (u64)*off + *len);
+		ret = -EINVAL;
 	}
 
-	/* return pointer to beginning of data area, ie offset from SMB start */
-	if ((*off != 0) && (*len != 0))
-		return (char *)hdr + *off;
-	else
-		return NULL;
+	return ret;
 }
 
 /*
  * Calculate the size of the SMB message based on the fixed header
  * portion, the number of word parameters and the data portion of the message.
  */
-static unsigned int smb2_calc_size(void *buf)
+static int smb2_calc_size(void *buf, unsigned int *len)
 {
 	struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
 	struct smb2_hdr *hdr = &pdu->hdr;
-	int offset; /* the offset from the beginning of SMB to data area */
-	int data_length; /* the length of the variable length data area */
+	unsigned int offset; /* the offset from the beginning of SMB to data area */
+	unsigned int data_length; /* the length of the variable length data area */
+	int ret;
+
 	/* Structure Size has already been checked to make sure it is 64 */
-	int len = le16_to_cpu(hdr->StructureSize);
+	*len = le16_to_cpu(hdr->StructureSize);
 
 	/*
 	 * StructureSize2, ie length of fixed parameter area has already
 	 * been checked to make sure it is the correct length.
 	 */
-	len += le16_to_cpu(pdu->StructureSize2);
+	*len += le16_to_cpu(pdu->StructureSize2);
+	/*
+	 * StructureSize2 of smb2_lock pdu is set to 48, indicating
+	 * the size of smb2 lock request with single smb2_lock_element
+	 * regardless of number of locks. Subtract single
+	 * smb2_lock_element for correct buffer size check.
+	 */
+	if (hdr->Command == SMB2_LOCK)
+		*len -= sizeof(struct smb2_lock_element);
 
 	if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
 		goto calc_size_exit;
 
-	smb2_get_data_area_len(&offset, &data_length, hdr);
-	ksmbd_debug(SMB, "SMB2 data length %d offset %d\n", data_length,
+	ret = smb2_get_data_area_len(&offset, &data_length, hdr);
+	if (ret)
+		return ret;
+	ksmbd_debug(SMB, "SMB2 data length %u offset %u\n", data_length,
 		    offset);
 
 	if (data_length > 0) {
@@ -237,16 +231,19 @@ static unsigned int smb2_calc_size(void *buf)
 		 * for some commands, typically those with odd StructureSize,
 		 * so we must add one to the calculation.
 		 */
-		if (offset + 1 < len)
+		if (offset + 1 < *len) {
 			ksmbd_debug(SMB,
-				    "data area offset %d overlaps SMB2 header %d\n",
-				    offset + 1, len);
-		else
-			len = offset + data_length;
+				    "data area offset %d overlaps SMB2 header %u\n",
+				    offset + 1, *len);
+			return -EINVAL;
+		}
+
+		*len = offset + data_length;
 	}
+
 calc_size_exit:
-	ksmbd_debug(SMB, "SMB2 len %d\n", len);
-	return len;
+	ksmbd_debug(SMB, "SMB2 len %u\n", *len);
+	return 0;
 }
 
 static inline int smb2_query_info_req_len(struct smb2_query_info_req *h)
@@ -391,9 +388,11 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 		return 1;
 	}
 
-	clc_len = smb2_calc_size(hdr);
+	if (smb2_calc_size(hdr, &clc_len))
+		return 1;
+
 	if (len != clc_len) {
-		/* server can return one byte more due to implied bcc[0] */
+		/* client can return one byte more due to implied bcc[0] */
 		if (clc_len == len + 1)
 			return 0;
 
@@ -418,9 +417,6 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 			return 0;
 		}
 
-		if (command == SMB2_LOCK_HE && len == 88)
-			return 0;
-
 		ksmbd_debug(SMB,
 			    "cli req too short, len %d not %d. cmd:%d mid:%llu\n",
 			    len, clc_len, command,
-- 
2.31.1

[PATCH v5 06/20] ksmbd: add validation in smb2 negotiate

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

This patch add validation to check request buffer check in smb2
negotiate and fix null pointer deferencing oops in smb3_preauth_hash_rsp()
that found from manual test.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2pdu.c    | 42 +++++++++++++++++++++++++++++++++++++++++-
 fs/ksmbd/smb_common.c | 32 +++++++++++++++++++++++++++-----
 2 files changed, 68 insertions(+), 6 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index c434390ffcae..0b0ab3297e05 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1067,6 +1067,7 @@ int smb2_handle_negotiate(struct ksmbd_work *work)
 	struct smb2_negotiate_req *req = work->request_buf;
 	struct smb2_negotiate_rsp *rsp = work->response_buf;
 	int rc = 0;
+	unsigned int smb2_buf_len, smb2_neg_size;
 	__le32 status;
 
 	ksmbd_debug(SMB, "Received negotiate request\n");
@@ -1084,6 +1085,44 @@ int smb2_handle_negotiate(struct ksmbd_work *work)
 		goto err_out;
 	}
 
+	smb2_buf_len = get_rfc1002_len(work->request_buf);
+	smb2_neg_size = offsetof(struct smb2_negotiate_req, Dialects) - 4;
+	if (smb2_neg_size > smb2_buf_len) {
+		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+		rc = -EINVAL;
+		goto err_out;
+	}
+
+	if (conn->dialect == SMB311_PROT_ID) {
+		unsigned int nego_ctxt_off = le32_to_cpu(req->NegotiateContextOffset);
+
+		if (smb2_buf_len < nego_ctxt_off) {
+			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+			rc = -EINVAL;
+			goto err_out;
+		}
+
+		if (smb2_neg_size > nego_ctxt_off) {
+			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+			rc = -EINVAL;
+			goto err_out;
+		}
+
+		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
+		    nego_ctxt_off) {
+			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+			rc = -EINVAL;
+			goto err_out;
+		}
+	} else {
+		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
+		    smb2_buf_len) {
+			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+			rc = -EINVAL;
+			goto err_out;
+		}
+	}
+
 	conn->cli_cap = le32_to_cpu(req->Capabilities);
 	switch (conn->dialect) {
 	case SMB311_PROT_ID:
@@ -8301,7 +8340,8 @@ void smb3_preauth_hash_rsp(struct ksmbd_work *work)
 
 	WORK_BUFFERS(work, req, rsp);
 
-	if (le16_to_cpu(req->Command) == SMB2_NEGOTIATE_HE)
+	if (le16_to_cpu(req->Command) == SMB2_NEGOTIATE_HE &&
+	    conn->preauth_info)
 		ksmbd_gen_preauth_integrity_hash(conn, (char *)rsp,
 						 conn->preauth_info->Preauth_HashValue);
 
diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index 20bd5b8e3c0a..b6c4c7e960fa 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -168,10 +168,12 @@ static bool supported_protocol(int idx)
 		idx <= server_conf.max_protocol);
 }
 
-static char *next_dialect(char *dialect, int *next_off)
+static char *next_dialect(char *dialect, int *next_off, int bcount)
 {
 	dialect = dialect + *next_off;
-	*next_off = strlen(dialect);
+	*next_off = strnlen(dialect, bcount);
+	if (dialect[*next_off] != '\0')
+		return NULL;
 	return dialect;
 }
 
@@ -186,7 +188,9 @@ static int ksmbd_lookup_dialect_by_name(char *cli_dialects, __le16 byte_count)
 		dialect = cli_dialects;
 		bcount = le16_to_cpu(byte_count);
 		do {
-			dialect = next_dialect(dialect, &next);
+			dialect = next_dialect(dialect, &next, bcount);
+			if (!dialect)
+				break;
 			ksmbd_debug(SMB, "client requested dialect %s\n",
 				    dialect);
 			if (!strcmp(dialect, smb1_protos[i].name)) {
@@ -234,13 +238,22 @@ int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count)
 
 static int ksmbd_negotiate_smb_dialect(void *buf)
 {
-	__le32 proto;
+	int smb_buf_length = get_rfc1002_len(buf);
+	__le32 proto = ((struct smb2_hdr *)buf)->ProtocolId;
 
-	proto = ((struct smb2_hdr *)buf)->ProtocolId;
 	if (proto == SMB2_PROTO_NUMBER) {
 		struct smb2_negotiate_req *req;
+		int smb2_neg_size =
+			offsetof(struct smb2_negotiate_req, Dialects) - 4;
 
 		req = (struct smb2_negotiate_req *)buf;
+		if (smb2_neg_size > smb_buf_length)
+			goto err_out;
+
+		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
+		    smb_buf_length)
+			goto err_out;
+
 		return ksmbd_lookup_dialect_by_id(req->Dialects,
 						  req->DialectCount);
 	}
@@ -250,10 +263,19 @@ static int ksmbd_negotiate_smb_dialect(void *buf)
 		struct smb_negotiate_req *req;
 
 		req = (struct smb_negotiate_req *)buf;
+		if (le16_to_cpu(req->ByteCount) < 2)
+			goto err_out;
+
+		if (offsetof(struct smb_negotiate_req, DialectsArray) - 4 +
+			le16_to_cpu(req->ByteCount) > smb_buf_length) {
+			goto err_out;
+		}
+
 		return ksmbd_lookup_dialect_by_name(req->DialectsArray,
 						    req->ByteCount);
 	}
 
+err_out:
 	return BAD_PROT_ID;
 }
 
-- 
2.31.1

[PATCH v5 07/20] ksmbd: add buffer validation for SMB2_CREATE_CONTEXT

[Ralph Boehme]

From: Hyunchul Lee <hyc.lee@gmail.com>

Add buffer validation for SMB2_CREATE_CONTEXT.

Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/oplock.c  | 41 +++++++++++++++++++++++++++++++----------
 fs/ksmbd/smb2pdu.c | 25 ++++++++++++++++++++++++-
 fs/ksmbd/smbacl.c  | 21 +++++++++++++++++++--
 3 files changed, 74 insertions(+), 13 deletions(-)

diff --git a/fs/ksmbd/oplock.c b/fs/ksmbd/oplock.c
index 16b6236d1bd2..f9dae6ef2115 100644
--- a/fs/ksmbd/oplock.c
+++ b/fs/ksmbd/oplock.c
@@ -1451,26 +1451,47 @@ struct lease_ctx_info *parse_lease_state(void *open_req)
  */
 struct create_context *smb2_find_context_vals(void *open_req, const char *tag)
 {
-	char *data_offset;
 	struct create_context *cc;
 	unsigned int next = 0;
 	char *name;
 	struct smb2_create_req *req = (struct smb2_create_req *)open_req;
+	unsigned int remain_len, name_off, name_len, value_off, value_len,
+		     cc_len;
 
-	data_offset = (char *)req + 4 + le32_to_cpu(req->CreateContextsOffset);
-	cc = (struct create_context *)data_offset;
+	/*
+	 * CreateContextsOffset and CreateContextsLength are guaranteed to
+	 * be valid because of ksmbd_smb2_check_message().
+	 */
+	cc = (struct create_context *)((char *)req + 4 +
+				       le32_to_cpu(req->CreateContextsOffset));
+	remain_len = le32_to_cpu(req->CreateContextsLength);
 	do {
-		int val;
-
 		cc = (struct create_context *)((char *)cc + next);
-		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
-		val = le16_to_cpu(cc->NameLength);
-		if (val < 4)
+		if (remain_len < offsetof(struct create_context, Buffer))
 			return ERR_PTR(-EINVAL);
 
-		if (memcmp(name, tag, val) == 0)
-			return cc;
 		next = le32_to_cpu(cc->Next);
+		name_off = le16_to_cpu(cc->NameOffset);
+		name_len = le16_to_cpu(cc->NameLength);
+		value_off = le16_to_cpu(cc->DataOffset);
+		value_len = le32_to_cpu(cc->DataLength);
+		cc_len = next ? next : remain_len;
+
+		if ((next & 0x7) != 0 ||
+		    next > remain_len ||
+		    name_off != offsetof(struct create_context, Buffer) ||
+		    name_len < 4 ||
+		    name_off + name_len > cc_len ||
+		    (value_off & 0x7) != 0 ||
+		    (value_off && (value_off < name_off + name_len)) ||
+		    ((u64)value_off + value_len > cc_len))
+			return ERR_PTR(-EINVAL);
+
+		name = (char *)cc + name_off;
+		if (memcmp(name, tag, name_len) == 0)
+			return cc;
+
+		remain_len -= next;
 	} while (next != 0);
 
 	return NULL;
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 0b0ab3297e05..e40bcc86f3b3 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2427,6 +2427,10 @@ static int smb2_create_sd_buffer(struct ksmbd_work *work,
 	ksmbd_debug(SMB,
 		    "Set ACLs using SMB2_CREATE_SD_BUFFER context\n");
 	sd_buf = (struct create_sd_buf_req *)context;
+	if (le16_to_cpu(context->DataOffset) +
+	    le32_to_cpu(context->DataLength) <
+	    sizeof(struct create_sd_buf_req))
+		return -EINVAL;
 	return set_info_sec(work->conn, work->tcon, path, &sd_buf->ntsd,
 			    le32_to_cpu(sd_buf->ccontext.DataLength), true);
 }
@@ -2621,6 +2625,12 @@ int smb2_open(struct ksmbd_work *work)
 			goto err_out1;
 		} else if (context) {
 			ea_buf = (struct create_ea_buf_req *)context;
+			if (le16_to_cpu(context->DataOffset) +
+			    le32_to_cpu(context->DataLength) <
+			    sizeof(struct create_ea_buf_req)) {
+				rc = -EINVAL;
+				goto err_out1;
+			}
 			if (req->CreateOptions & FILE_NO_EA_KNOWLEDGE_LE) {
 				rsp->hdr.Status = STATUS_ACCESS_DENIED;
 				rc = -EACCES;
@@ -2659,6 +2669,12 @@ int smb2_open(struct ksmbd_work *work)
 			} else if (context) {
 				struct create_posix *posix =
 					(struct create_posix *)context;
+				if (le16_to_cpu(context->DataOffset) +
+				    le32_to_cpu(context->DataLength) <
+				    sizeof(struct create_posix)) {
+					rc = -EINVAL;
+					goto err_out1;
+				}
 				ksmbd_debug(SMB, "get posix context\n");
 
 				posix_mode = le32_to_cpu(posix->Mode);
@@ -3049,9 +3065,16 @@ int smb2_open(struct ksmbd_work *work)
 			rc = PTR_ERR(az_req);
 			goto err_out;
 		} else if (az_req) {
-			loff_t alloc_size = le64_to_cpu(az_req->AllocationSize);
+			loff_t alloc_size;
 			int err;
 
+			if (le16_to_cpu(az_req->ccontext.DataOffset) +
+			    le32_to_cpu(az_req->ccontext.DataLength) <
+			    sizeof(struct create_alloc_size_req)) {
+				rc = -EINVAL;
+				goto err_out;
+			}
+			alloc_size = le64_to_cpu(az_req->AllocationSize);
 			ksmbd_debug(SMB,
 				    "request smb2 create allocate size : %llu\n",
 				    alloc_size);
diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c
index 0a95cdec8c80..bd792db32623 100644
--- a/fs/ksmbd/smbacl.c
+++ b/fs/ksmbd/smbacl.c
@@ -380,7 +380,7 @@ static void parse_dacl(struct user_namespace *user_ns,
 {
 	int i, ret;
 	int num_aces = 0;
-	int acl_size;
+	unsigned int acl_size;
 	char *acl_base;
 	struct smb_ace **ppace;
 	struct posix_acl_entry *cf_pace, *cf_pdace;
@@ -392,7 +392,7 @@ static void parse_dacl(struct user_namespace *user_ns,
 		return;
 
 	/* validate that we do not go past end of acl */
-	if (end_of_acl <= (char *)pdacl ||
+	if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) ||
 	    end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
 		pr_err("ACL too small to parse DACL\n");
 		return;
@@ -431,8 +431,22 @@ static void parse_dacl(struct user_namespace *user_ns,
 	 * user/group/other have no permissions
 	 */
 	for (i = 0; i < num_aces; ++i) {
+		if (end_of_acl - acl_base < acl_size)
+			break;
+
 		ppace[i] = (struct smb_ace *)(acl_base + acl_size);
 		acl_base = (char *)ppace[i];
+		acl_size = offsetof(struct smb_ace, sid) +
+			offsetof(struct smb_sid, sub_auth);
+
+		if (end_of_acl - acl_base < acl_size ||
+		    ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES ||
+		    (end_of_acl - acl_base <
+		     acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) ||
+		    (le16_to_cpu(ppace[i]->size) <
+		     acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth))
+			break;
+
 		acl_size = le16_to_cpu(ppace[i]->size);
 		ppace[i]->access_req =
 			smb_map_generic_desired_access(ppace[i]->access_req);
@@ -807,6 +821,9 @@ int parse_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd,
 	if (!pntsd)
 		return -EIO;
 
+	if (acl_len < sizeof(struct smb_ntsd))
+		return -EINVAL;
+
 	owner_sid_ptr = (struct smb_sid *)((char *)pntsd +
 			le32_to_cpu(pntsd->osidoffset));
 	group_sid_ptr = (struct smb_sid *)((char *)pntsd +
-- 
2.31.1

[PATCH v5 08/20] ksmbd: remove the leftover of smb2.0 dialect support

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Although ksmbd doesn't send SMB2.0 support in supported dialect list of smb
negotiate response, There is the leftover of smb2.0 dialect.
This patch remove it not to support SMB2.0 in ksmbd.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2ops.c    |  5 -----
 fs/ksmbd/smb2pdu.c    | 34 +++++++++-------------------------
 fs/ksmbd/smb2pdu.h    |  1 -
 fs/ksmbd/smb_common.c |  6 +++---
 4 files changed, 12 insertions(+), 34 deletions(-)

diff --git a/fs/ksmbd/smb2ops.c b/fs/ksmbd/smb2ops.c
index 197473871aa4..b06456eb587b 100644
--- a/fs/ksmbd/smb2ops.c
+++ b/fs/ksmbd/smb2ops.c
@@ -187,11 +187,6 @@ static struct smb_version_cmds smb2_0_server_cmds[NUMBER_OF_SMB2_COMMANDS] = {
 	[SMB2_CHANGE_NOTIFY_HE]	=	{ .proc = smb2_notify},
 };
 
-int init_smb2_0_server(struct ksmbd_conn *conn)
-{
-	return -EOPNOTSUPP;
-}
-
 /**
  * init_smb2_1_server() - initialize a smb server connection with smb2.1
  *			command dispatcher
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index e40bcc86f3b3..ec05d9dc6436 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -236,9 +236,6 @@ int init_smb2_neg_rsp(struct ksmbd_work *work)
 
 	if (conn->need_neg == false)
 		return -EINVAL;
-	if (!(conn->dialect >= SMB20_PROT_ID &&
-	      conn->dialect <= SMB311_PROT_ID))
-		return -EINVAL;
 
 	rsp_hdr = work->response_buf;
 
@@ -1166,13 +1163,6 @@ int smb2_handle_negotiate(struct ksmbd_work *work)
 	case SMB21_PROT_ID:
 		init_smb2_1_server(conn);
 		break;
-	case SMB20_PROT_ID:
-		rc = init_smb2_0_server(conn);
-		if (rc) {
-			rsp->hdr.Status = STATUS_NOT_SUPPORTED;
-			goto err_out;
-		}
-		break;
 	case SMB2X_PROT_ID:
 	case BAD_PROT_ID:
 	default:
@@ -1191,11 +1181,9 @@ int smb2_handle_negotiate(struct ksmbd_work *work)
 	rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
 	rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);
 
-	if (conn->dialect > SMB20_PROT_ID) {
-		memcpy(conn->ClientGUID, req->ClientGUID,
-		       SMB2_CLIENT_GUID_SIZE);
-		conn->cli_sec_mode = le16_to_cpu(req->SecurityMode);
-	}
+	memcpy(conn->ClientGUID, req->ClientGUID,
+			SMB2_CLIENT_GUID_SIZE);
+	conn->cli_sec_mode = le16_to_cpu(req->SecurityMode);
 
 	rsp->StructureSize = cpu_to_le16(65);
 	rsp->DialectRevision = cpu_to_le16(conn->dialect);
@@ -1537,11 +1525,9 @@ static int ntlm_authenticate(struct ksmbd_work *work)
 		}
 	}
 
-	if (conn->dialect > SMB20_PROT_ID) {
-		if (!ksmbd_conn_lookup_dialect(conn)) {
-			pr_err("fail to verify the dialect\n");
-			return -ENOENT;
-		}
+	if (!ksmbd_conn_lookup_dialect(conn)) {
+		pr_err("fail to verify the dialect\n");
+		return -ENOENT;
 	}
 	return 0;
 }
@@ -1623,11 +1609,9 @@ static int krb5_authenticate(struct ksmbd_work *work)
 		}
 	}
 
-	if (conn->dialect > SMB20_PROT_ID) {
-		if (!ksmbd_conn_lookup_dialect(conn)) {
-			pr_err("fail to verify the dialect\n");
-			return -ENOENT;
-		}
+	if (!ksmbd_conn_lookup_dialect(conn)) {
+		pr_err("fail to verify the dialect\n");
+		return -ENOENT;
 	}
 	return 0;
 }
diff --git a/fs/ksmbd/smb2pdu.h b/fs/ksmbd/smb2pdu.h
index 261825d06391..a6dec5ec6a54 100644
--- a/fs/ksmbd/smb2pdu.h
+++ b/fs/ksmbd/smb2pdu.h
@@ -1637,7 +1637,6 @@ struct smb2_posix_info {
 } __packed;
 
 /* functions */
-int init_smb2_0_server(struct ksmbd_conn *conn);
 void init_smb2_1_server(struct ksmbd_conn *conn);
 void init_smb3_0_server(struct ksmbd_conn *conn);
 void init_smb3_02_server(struct ksmbd_conn *conn);
diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index b6c4c7e960fa..707490ab1f4c 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -88,7 +88,7 @@ unsigned int ksmbd_server_side_copy_max_total_size(void)
 
 inline int ksmbd_min_protocol(void)
 {
-	return SMB2_PROT;
+	return SMB21_PROT;
 }
 
 inline int ksmbd_max_protocol(void)
@@ -427,7 +427,7 @@ int ksmbd_extract_shortname(struct ksmbd_conn *conn, const char *longname,
 
 static int __smb2_negotiate(struct ksmbd_conn *conn)
 {
-	return (conn->dialect >= SMB20_PROT_ID &&
+	return (conn->dialect >= SMB21_PROT_ID &&
 		conn->dialect <= SMB311_PROT_ID);
 }
 
@@ -457,7 +457,7 @@ int ksmbd_smb_negotiate_common(struct ksmbd_work *work, unsigned int command)
 		}
 	}
 
-	if (command == SMB2_NEGOTIATE_HE) {
+	if (command == SMB2_NEGOTIATE_HE && __smb2_negotiate(conn)) {
 		ret = smb2_handle_negotiate(work);
 		init_smb2_neg_rsp(work);
 		return ret;
-- 
2.31.1

[PATCH v5 09/20] ksmbd: remove NTLMv1 authentication

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Remove insecure NTLMv1 authentication.

Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/auth.c       | 205 ------------------------------------------
 fs/ksmbd/crypto_ctx.c |  16 ----
 fs/ksmbd/crypto_ctx.h |   8 --
 3 files changed, 229 deletions(-)

diff --git a/fs/ksmbd/auth.c b/fs/ksmbd/auth.c
index de36f12070bf..71c989f1568d 100644
--- a/fs/ksmbd/auth.c
+++ b/fs/ksmbd/auth.c
@@ -68,125 +68,6 @@ void ksmbd_copy_gss_neg_header(void *buf)
 	memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
 }
 
-static void
-str_to_key(unsigned char *str, unsigned char *key)
-{
-	int i;
-
-	key[0] = str[0] >> 1;
-	key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
-	key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
-	key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
-	key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
-	key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
-	key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
-	key[7] = str[6] & 0x7F;
-	for (i = 0; i < 8; i++)
-		key[i] = (key[i] << 1);
-}
-
-static int
-smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
-{
-	unsigned char key2[8];
-	struct des_ctx ctx;
-
-	if (fips_enabled) {
-		ksmbd_debug(AUTH, "FIPS compliance enabled: DES not permitted\n");
-		return -ENOENT;
-	}
-
-	str_to_key(key, key2);
-	des_expand_key(&ctx, key2, DES_KEY_SIZE);
-	des_encrypt(&ctx, out, in);
-	memzero_explicit(&ctx, sizeof(ctx));
-	return 0;
-}
-
-static int ksmbd_enc_p24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
-{
-	int rc;
-
-	rc = smbhash(p24, c8, p21);
-	if (rc)
-		return rc;
-	rc = smbhash(p24 + 8, c8, p21 + 7);
-	if (rc)
-		return rc;
-	return smbhash(p24 + 16, c8, p21 + 14);
-}
-
-/* produce a md4 message digest from data of length n bytes */
-static int ksmbd_enc_md4(unsigned char *md4_hash, unsigned char *link_str,
-			 int link_len)
-{
-	int rc;
-	struct ksmbd_crypto_ctx *ctx;
-
-	ctx = ksmbd_crypto_ctx_find_md4();
-	if (!ctx) {
-		ksmbd_debug(AUTH, "Crypto md4 allocation error\n");
-		return -ENOMEM;
-	}
-
-	rc = crypto_shash_init(CRYPTO_MD4(ctx));
-	if (rc) {
-		ksmbd_debug(AUTH, "Could not init md4 shash\n");
-		goto out;
-	}
-
-	rc = crypto_shash_update(CRYPTO_MD4(ctx), link_str, link_len);
-	if (rc) {
-		ksmbd_debug(AUTH, "Could not update with link_str\n");
-		goto out;
-	}
-
-	rc = crypto_shash_final(CRYPTO_MD4(ctx), md4_hash);
-	if (rc)
-		ksmbd_debug(AUTH, "Could not generate md4 hash\n");
-out:
-	ksmbd_release_crypto_ctx(ctx);
-	return rc;
-}
-
-static int ksmbd_enc_update_sess_key(unsigned char *md5_hash, char *nonce,
-				     char *server_challenge, int len)
-{
-	int rc;
-	struct ksmbd_crypto_ctx *ctx;
-
-	ctx = ksmbd_crypto_ctx_find_md5();
-	if (!ctx) {
-		ksmbd_debug(AUTH, "Crypto md5 allocation error\n");
-		return -ENOMEM;
-	}
-
-	rc = crypto_shash_init(CRYPTO_MD5(ctx));
-	if (rc) {
-		ksmbd_debug(AUTH, "Could not init md5 shash\n");
-		goto out;
-	}
-
-	rc = crypto_shash_update(CRYPTO_MD5(ctx), server_challenge, len);
-	if (rc) {
-		ksmbd_debug(AUTH, "Could not update with challenge\n");
-		goto out;
-	}
-
-	rc = crypto_shash_update(CRYPTO_MD5(ctx), nonce, len);
-	if (rc) {
-		ksmbd_debug(AUTH, "Could not update with nonce\n");
-		goto out;
-	}
-
-	rc = crypto_shash_final(CRYPTO_MD5(ctx), md5_hash);
-	if (rc)
-		ksmbd_debug(AUTH, "Could not generate md5 hash\n");
-out:
-	ksmbd_release_crypto_ctx(ctx);
-	return rc;
-}
-
 /**
  * ksmbd_gen_sess_key() - function to generate session key
  * @sess:	session of connection
@@ -324,43 +205,6 @@ static int calc_ntlmv2_hash(struct ksmbd_session *sess, char *ntlmv2_hash,
 	return ret;
 }
 
-/**
- * ksmbd_auth_ntlm() - NTLM authentication handler
- * @sess:	session of connection
- * @pw_buf:	NTLM challenge response
- * @passkey:	user password
- *
- * Return:	0 on success, error number on error
- */
-int ksmbd_auth_ntlm(struct ksmbd_session *sess, char *pw_buf)
-{
-	int rc;
-	unsigned char p21[21];
-	char key[CIFS_AUTH_RESP_SIZE];
-
-	memset(p21, '\0', 21);
-	memcpy(p21, user_passkey(sess->user), CIFS_NTHASH_SIZE);
-	rc = ksmbd_enc_p24(p21, sess->ntlmssp.cryptkey, key);
-	if (rc) {
-		pr_err("password processing failed\n");
-		return rc;
-	}
-
-	ksmbd_enc_md4(sess->sess_key, user_passkey(sess->user),
-		      CIFS_SMB1_SESSKEY_SIZE);
-	memcpy(sess->sess_key + CIFS_SMB1_SESSKEY_SIZE, key,
-	       CIFS_AUTH_RESP_SIZE);
-	sess->sequence_number = 1;
-
-	if (strncmp(pw_buf, key, CIFS_AUTH_RESP_SIZE) != 0) {
-		ksmbd_debug(AUTH, "ntlmv1 authentication failed\n");
-		return -EINVAL;
-	}
-
-	ksmbd_debug(AUTH, "ntlmv1 authentication pass\n");
-	return 0;
-}
-
 /**
  * ksmbd_auth_ntlmv2() - NTLMv2 authentication handler
  * @sess:	session of connection
@@ -441,44 +285,6 @@ int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
 	return rc;
 }
 
-/**
- * __ksmbd_auth_ntlmv2() - NTLM2(extended security) authentication handler
- * @sess:	session of connection
- * @client_nonce:	client nonce from LM response.
- * @ntlm_resp:		ntlm response data from client.
- *
- * Return:	0 on success, error number on error
- */
-static int __ksmbd_auth_ntlmv2(struct ksmbd_session *sess, char *client_nonce,
-			       char *ntlm_resp)
-{
-	char sess_key[CIFS_SMB1_SESSKEY_SIZE] = {0};
-	int rc;
-	unsigned char p21[21];
-	char key[CIFS_AUTH_RESP_SIZE];
-
-	rc = ksmbd_enc_update_sess_key(sess_key,
-				       client_nonce,
-				       (char *)sess->ntlmssp.cryptkey, 8);
-	if (rc) {
-		pr_err("password processing failed\n");
-		goto out;
-	}
-
-	memset(p21, '\0', 21);
-	memcpy(p21, user_passkey(sess->user), CIFS_NTHASH_SIZE);
-	rc = ksmbd_enc_p24(p21, sess_key, key);
-	if (rc) {
-		pr_err("password processing failed\n");
-		goto out;
-	}
-
-	if (memcmp(ntlm_resp, key, CIFS_AUTH_RESP_SIZE) != 0)
-		rc = -EINVAL;
-out:
-	return rc;
-}
-
 /**
  * ksmbd_decode_ntlmssp_auth_blob() - helper function to construct
  * authenticate blob
@@ -512,17 +318,6 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
 	nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset);
 	nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length);
 
-	/* process NTLM authentication */
-	if (nt_len == CIFS_AUTH_RESP_SIZE) {
-		if (le32_to_cpu(authblob->NegotiateFlags) &
-		    NTLMSSP_NEGOTIATE_EXTENDED_SEC)
-			return __ksmbd_auth_ntlmv2(sess, (char *)authblob +
-				lm_off, (char *)authblob + nt_off);
-		else
-			return ksmbd_auth_ntlm(sess, (char *)authblob +
-				nt_off);
-	}
-
 	/* TODO : use domain name that imported from configuration file */
 	domain_name = smb_strndup_from_utf16((const char *)authblob +
 			le32_to_cpu(authblob->DomainName.BufferOffset),
diff --git a/fs/ksmbd/crypto_ctx.c b/fs/ksmbd/crypto_ctx.c
index 5f4b1008d17e..81488d04199d 100644
--- a/fs/ksmbd/crypto_ctx.c
+++ b/fs/ksmbd/crypto_ctx.c
@@ -81,12 +81,6 @@ static struct shash_desc *alloc_shash_desc(int id)
 	case CRYPTO_SHASH_SHA512:
 		tfm = crypto_alloc_shash("sha512", 0, 0);
 		break;
-	case CRYPTO_SHASH_MD4:
-		tfm = crypto_alloc_shash("md4", 0, 0);
-		break;
-	case CRYPTO_SHASH_MD5:
-		tfm = crypto_alloc_shash("md5", 0, 0);
-		break;
 	default:
 		return NULL;
 	}
@@ -214,16 +208,6 @@ struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_sha512(void)
 	return ____crypto_shash_ctx_find(CRYPTO_SHASH_SHA512);
 }
 
-struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_md4(void)
-{
-	return ____crypto_shash_ctx_find(CRYPTO_SHASH_MD4);
-}
-
-struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_md5(void)
-{
-	return ____crypto_shash_ctx_find(CRYPTO_SHASH_MD5);
-}
-
 static struct ksmbd_crypto_ctx *____crypto_aead_ctx_find(int id)
 {
 	struct ksmbd_crypto_ctx *ctx;
diff --git a/fs/ksmbd/crypto_ctx.h b/fs/ksmbd/crypto_ctx.h
index ef11154b43df..4a367c62f653 100644
--- a/fs/ksmbd/crypto_ctx.h
+++ b/fs/ksmbd/crypto_ctx.h
@@ -15,8 +15,6 @@ enum {
 	CRYPTO_SHASH_CMACAES,
 	CRYPTO_SHASH_SHA256,
 	CRYPTO_SHASH_SHA512,
-	CRYPTO_SHASH_MD4,
-	CRYPTO_SHASH_MD5,
 	CRYPTO_SHASH_MAX,
 };
 
@@ -43,8 +41,6 @@ struct ksmbd_crypto_ctx {
 #define CRYPTO_CMACAES(c)	((c)->desc[CRYPTO_SHASH_CMACAES])
 #define CRYPTO_SHA256(c)	((c)->desc[CRYPTO_SHASH_SHA256])
 #define CRYPTO_SHA512(c)	((c)->desc[CRYPTO_SHASH_SHA512])
-#define CRYPTO_MD4(c)		((c)->desc[CRYPTO_SHASH_MD4])
-#define CRYPTO_MD5(c)		((c)->desc[CRYPTO_SHASH_MD5])
 
 #define CRYPTO_HMACMD5_TFM(c)	((c)->desc[CRYPTO_SHASH_HMACMD5]->tfm)
 #define CRYPTO_HMACSHA256_TFM(c)\
@@ -52,8 +48,6 @@ struct ksmbd_crypto_ctx {
 #define CRYPTO_CMACAES_TFM(c)	((c)->desc[CRYPTO_SHASH_CMACAES]->tfm)
 #define CRYPTO_SHA256_TFM(c)	((c)->desc[CRYPTO_SHASH_SHA256]->tfm)
 #define CRYPTO_SHA512_TFM(c)	((c)->desc[CRYPTO_SHASH_SHA512]->tfm)
-#define CRYPTO_MD4_TFM(c)	((c)->desc[CRYPTO_SHASH_MD4]->tfm)
-#define CRYPTO_MD5_TFM(c)	((c)->desc[CRYPTO_SHASH_MD5]->tfm)
 
 #define CRYPTO_GCM(c)		((c)->ccmaes[CRYPTO_AEAD_AES_GCM])
 #define CRYPTO_CCM(c)		((c)->ccmaes[CRYPTO_AEAD_AES_CCM])
@@ -64,8 +58,6 @@ struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_hmacsha256(void);
 struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_cmacaes(void);
 struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_sha512(void);
 struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_sha256(void);
-struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_md4(void);
-struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_md5(void);
 struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_gcm(void);
 struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_ccm(void);
 void ksmbd_crypto_destroy(void);
-- 
2.31.1

[PATCH v5 10/20] ksmbd: fix transform header validation

[Ralph Boehme]

From: Namjae Jeon <linkinjeon@kernel.org>

Validate that the transform and smb request headers are present
before checking OriginalMessageSize and SessionId fields.

Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/ksmbd/smb2pdu.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index ec05d9dc6436..b06361313889 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -8455,16 +8455,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
 	unsigned int buf_data_size = pdu_length + 4 -
 		sizeof(struct smb2_transform_hdr);
 	struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
-	unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
 	int rc = 0;
 
-	sess = ksmbd_session_lookup_all(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));
-		return -ECONNABORTED;
-	}
-
 	if (pdu_length + 4 <
 	    sizeof(struct smb2_transform_hdr) + sizeof(struct smb2_hdr)) {
 		pr_err("Transform message is too small (%u)\n",
@@ -8472,11 +8464,19 @@ int smb3_decrypt_req(struct ksmbd_work *work)
 		return -ECONNABORTED;
 	}
 
-	if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
+	if (pdu_length + 4 <
+	    le32_to_cpu(tr_hdr->OriginalMessageSize) + sizeof(struct smb2_transform_hdr)) {
 		pr_err("Transform message is broken\n");
 		return -ECONNABORTED;
 	}
 
+	sess = ksmbd_session_lookup_all(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));
+		return -ECONNABORTED;
+	}
+
 	iov[0].iov_base = buf;
 	iov[0].iov_len = sizeof(struct smb2_transform_hdr);
 	iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
-- 
2.31.1

[PATCH v5 11/20] ksmbd: use ksmbd_req_buf_next() in ksmbd_smb2_check_message()

[Ralph Boehme]

No change in behaviour.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2misc.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 9edd9c161b27..2cc031c39514 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -329,17 +329,12 @@ static int smb2_validate_credit_charge(struct smb2_hdr *hdr)
 
 int ksmbd_smb2_check_message(struct ksmbd_work *work)
 {
-	struct smb2_pdu *pdu = work->request_buf;
+	struct smb2_pdu *pdu = ksmbd_req_buf_next(work);
 	struct smb2_hdr *hdr = &pdu->hdr;
 	int command;
 	__u32 clc_len;  /* calculated length */
 	__u32 len = get_rfc1002_len(pdu);
 
-	if (work->next_smb2_rcv_hdr_off) {
-		pdu = ksmbd_req_buf_next(work);
-		hdr = &pdu->hdr;
-	}
-
 	if (le32_to_cpu(hdr->NextCommand) > 0) {
 		len = le32_to_cpu(hdr->NextCommand);
 	} else if (work->next_smb2_rcv_hdr_off) {
-- 
2.31.1

[PATCH v5 12/20] ksmbd: use ksmbd_req_buf_next() in ksmbd_verify_smb_message()

[Ralph Boehme]

No change in behaviour.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index 707490ab1f4c..e1e5a071678e 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -132,7 +132,7 @@ int ksmbd_lookup_protocol_idx(char *str)
  */
 int ksmbd_verify_smb_message(struct ksmbd_work *work)
 {
-	struct smb2_hdr *smb2_hdr = work->request_buf + work->next_smb2_rcv_hdr_off;
+	struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
 	struct smb_hdr *hdr;
 
 	if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
-- 
2.31.1

[PATCH v5 13/20] ksmbd: remove ksmbd_verify_smb_message()

[Ralph Boehme]

Another leftover from SMB1 support. Remove it and use ksmbd_verify_smb_message()
directly in __process_request().

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/server.c     |  2 +-
 fs/ksmbd/smb_common.c | 24 ------------------------
 fs/ksmbd/smb_common.h |  1 -
 3 files changed, 1 insertion(+), 26 deletions(-)

diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c
index 2a2b2135bfde..328c4225cec1 100644
--- a/fs/ksmbd/server.c
+++ b/fs/ksmbd/server.c
@@ -114,7 +114,7 @@ static int __process_request(struct ksmbd_work *work, struct ksmbd_conn *conn,
 	if (check_conn_state(work))
 		return SERVER_HANDLER_CONTINUE;
 
-	if (ksmbd_verify_smb_message(work))
+	if (ksmbd_smb2_check_message(work))
 		return SERVER_HANDLER_ABORT;
 
 	command = conn->ops->get_cmd_val(work);
diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index e1e5a071678e..4a283cd6d6e1 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -122,30 +122,6 @@ int ksmbd_lookup_protocol_idx(char *str)
 	return -1;
 }
 
-/**
- * ksmbd_verify_smb_message() - check for valid smb2 request header
- * @work:	smb work
- *
- * check for valid smb signature and packet direction(request/response)
- *
- * Return:      0 on success, otherwise -EINVAL
- */
-int ksmbd_verify_smb_message(struct ksmbd_work *work)
-{
-	struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
-	struct smb_hdr *hdr;
-
-	if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
-		return ksmbd_smb2_check_message(work);
-
-	hdr = work->request_buf;
-	if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
-	    hdr->Command == SMB_COM_NEGOTIATE)
-		return 0;
-
-	return -EINVAL;
-}
-
 /**
  * ksmbd_smb_request() - check for valid smb request type
  * @conn:	connection instance
diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h
index 6e79e7577f6b..782c06292020 100644
--- a/fs/ksmbd/smb_common.h
+++ b/fs/ksmbd/smb_common.h
@@ -488,7 +488,6 @@ int ksmbd_max_protocol(void);
 
 int ksmbd_lookup_protocol_idx(char *str);
 
-int ksmbd_verify_smb_message(struct ksmbd_work *work);
 bool ksmbd_smb_request(struct ksmbd_conn *conn);
 
 int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count);
-- 
2.31.1

Re: [PATCH v5 13/20] ksmbd: remove ksmbd_verify_smb_message()

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Another leftover from SMB1 support. Remove it and use
> ksmbd_verify_smb_message()
> directly in __process_request().
>
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/server.c     |  2 +-
>  fs/ksmbd/smb_common.c | 24 ------------------------
>  fs/ksmbd/smb_common.h |  1 -
>  3 files changed, 1 insertion(+), 26 deletions(-)
>
> diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c
> index 2a2b2135bfde..328c4225cec1 100644
> --- a/fs/ksmbd/server.c
> +++ b/fs/ksmbd/server.c
> @@ -114,7 +114,7 @@ static int __process_request(struct ksmbd_work *work,
> struct ksmbd_conn *conn,
>  	if (check_conn_state(work))
>  		return SERVER_HANDLER_CONTINUE;
>
> -	if (ksmbd_verify_smb_message(work))
> +	if (ksmbd_smb2_check_message(work))
>  		return SERVER_HANDLER_ABORT;
>
>  	command = conn->ops->get_cmd_val(work);
> diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
> index e1e5a071678e..4a283cd6d6e1 100644
> --- a/fs/ksmbd/smb_common.c
> +++ b/fs/ksmbd/smb_common.c
> @@ -122,30 +122,6 @@ int ksmbd_lookup_protocol_idx(char *str)
>  	return -1;
>  }
>
> -/**
> - * ksmbd_verify_smb_message() - check for valid smb2 request header
> - * @work:	smb work
> - *
> - * check for valid smb signature and packet direction(request/response)
> - *
> - * Return:      0 on success, otherwise -EINVAL
> - */
> -int ksmbd_verify_smb_message(struct ksmbd_work *work)
> -{
> -	struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
> -	struct smb_hdr *hdr;
> -
> -	if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
> -		return ksmbd_smb2_check_message(work);
> -
> -	hdr = work->request_buf;
> -	if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
> -	    hdr->Command == SMB_COM_NEGOTIATE)
> -		return 0;
smb1 negotiate is needed for windows connection. Have you tested with
windows client ?

> -
> -	return -EINVAL;
> -}
> -
>  /**
>   * ksmbd_smb_request() - check for valid smb request type
>   * @conn:	connection instance
> diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h
> index 6e79e7577f6b..782c06292020 100644
> --- a/fs/ksmbd/smb_common.h
> +++ b/fs/ksmbd/smb_common.h
> @@ -488,7 +488,6 @@ int ksmbd_max_protocol(void);
>
>  int ksmbd_lookup_protocol_idx(char *str);
>
> -int ksmbd_verify_smb_message(struct ksmbd_work *work);
>  bool ksmbd_smb_request(struct ksmbd_conn *conn);
>
>  int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16
> dialects_count);
> --
> 2.31.1
>
>

Re: [PATCH v5 13/20] ksmbd: remove ksmbd_verify_smb_message()

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 2459 bytes --]

Am 02.10.21 um 07:46 schrieb Namjae Jeon:
> 2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
>> Another leftover from SMB1 support. Remove it and use
>> ksmbd_verify_smb_message()
>> directly in __process_request().
>>
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/server.c     |  2 +-
>>   fs/ksmbd/smb_common.c | 24 ------------------------
>>   fs/ksmbd/smb_common.h |  1 -
>>   3 files changed, 1 insertion(+), 26 deletions(-)
>>
>> diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c
>> index 2a2b2135bfde..328c4225cec1 100644
>> --- a/fs/ksmbd/server.c
>> +++ b/fs/ksmbd/server.c
>> @@ -114,7 +114,7 @@ static int __process_request(struct ksmbd_work *work,
>> struct ksmbd_conn *conn,
>>   	if (check_conn_state(work))
>>   		return SERVER_HANDLER_CONTINUE;
>>
>> -	if (ksmbd_verify_smb_message(work))
>> +	if (ksmbd_smb2_check_message(work))
>>   		return SERVER_HANDLER_ABORT;
>>
>>   	command = conn->ops->get_cmd_val(work);
>> diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
>> index e1e5a071678e..4a283cd6d6e1 100644
>> --- a/fs/ksmbd/smb_common.c
>> +++ b/fs/ksmbd/smb_common.c
>> @@ -122,30 +122,6 @@ int ksmbd_lookup_protocol_idx(char *str)
>>   	return -1;
>>   }
>>
>> -/**
>> - * ksmbd_verify_smb_message() - check for valid smb2 request header
>> - * @work:	smb work
>> - *
>> - * check for valid smb signature and packet direction(request/response)
>> - *
>> - * Return:      0 on success, otherwise -EINVAL
>> - */
>> -int ksmbd_verify_smb_message(struct ksmbd_work *work)
>> -{
>> -	struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
>> -	struct smb_hdr *hdr;
>> -
>> -	if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
>> -		return ksmbd_smb2_check_message(work);
>> -
>> -	hdr = work->request_buf;
>> -	if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
>> -	    hdr->Command == SMB_COM_NEGOTIATE)
>> -		return 0;
> smb1 negotiate is needed for windows connection. Have you tested with
> windows client ?

d'oh! You're right. Guess I got in a frenzy to remove more SMB1 stuff. :)

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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Re: [PATCH v5 13/20] ksmbd: remove ksmbd_verify_smb_message()

[Jeremy Allison]

On Sat, Oct 02, 2021 at 02:46:16PM +0900, Namjae Jeon wrote:

>smb1 negotiate is needed for windows connection. Have you tested with
>windows client ?

Isn't this only needed for Win7 upgrading a connection from
SMB1 -> SMB2 on initial connect. I don't think Win8 and above
need this.

Is this as far back as we want to support ?

Re: [PATCH v5 13/20] ksmbd: remove ksmbd_verify_smb_message()

[Namjae Jeon]

2021-10-04 8:37 GMT+09:00, Jeremy Allison <jra@samba.org>:
> On Sat, Oct 02, 2021 at 02:46:16PM +0900, Namjae Jeon wrote:
>
>>smb1 negotiate is needed for windows connection. Have you tested with
>>windows client ?
>
Hi Jeremy,
> Isn't this only needed for Win7 upgrading a connection from
> SMB1 -> SMB2 on initial connect. I don't think Win8 and above
> need this.
>
> Is this as far back as we want to support ?
Win10 still send smb1 negotiate request for auto negotiation.

Thanks!
>

[PATCH v5 14/20] ksmbd: add ksmbd_smb2_cur_pdu_buflen()

[Ralph Boehme]

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2misc.c | 25 +++++++++++++++++++++++++
 fs/ksmbd/smb2pdu.h  |  1 +
 2 files changed, 26 insertions(+)

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 2cc031c39514..76f53db7db8d 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -427,3 +427,28 @@ int smb2_negotiate_request(struct ksmbd_work *work)
 {
 	return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE);
 }
+
+/**
+ * ksmbd_smb2_cur_pdu_buflen() - Get len of current SMB2 PDU buffer
+ * This returns the lenght including any possible padding.
+ * @work: smb work containing request buffer
+ */
+unsigned int ksmbd_smb2_cur_pdu_buflen(struct ksmbd_work *work)
+{
+	struct smb2_hdr *hdr = ksmbd_req_buf_next(work);
+	unsigned int buf_len;
+	unsigned int pdu_len;
+
+	if (hdr->NextCommand != 0) {
+		/*
+		 * hdr->NextCommand has already been validated by
+		 * init_chained_smb2_rsp().
+		 */
+		return __le32_to_cpu(hdr->NextCommand);
+	}
+
+	buf_len = get_rfc1002_len(work->request_buf);
+	pdu_len = buf_len - work->next_smb2_rcv_hdr_off;
+	return pdu_len;
+}
+
diff --git a/fs/ksmbd/smb2pdu.h b/fs/ksmbd/smb2pdu.h
index a6dec5ec6a54..c5fa8256b0bb 100644
--- a/fs/ksmbd/smb2pdu.h
+++ b/fs/ksmbd/smb2pdu.h
@@ -1680,6 +1680,7 @@ int smb2_set_rsp_credits(struct ksmbd_work *work);
 
 /* smb2 misc functions */
 int ksmbd_smb2_check_message(struct ksmbd_work *work);
+unsigned int ksmbd_smb2_cur_pdu_buflen(struct ksmbd_work *work);
 
 /* smb2 command handlers */
 int smb2_handle_negotiate(struct ksmbd_work *work);
-- 
2.31.1

Re: [PATCH v5 14/20] ksmbd: add ksmbd_smb2_cur_pdu_buflen()

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/smb2misc.c | 25 +++++++++++++++++++++++++
>  fs/ksmbd/smb2pdu.h  |  1 +
>  2 files changed, 26 insertions(+)
>
> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
> index 2cc031c39514..76f53db7db8d 100644
> --- a/fs/ksmbd/smb2misc.c
> +++ b/fs/ksmbd/smb2misc.c
> @@ -427,3 +427,28 @@ int smb2_negotiate_request(struct ksmbd_work *work)
>  {
>  	return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE);
>  }
> +
> +/**
> + * ksmbd_smb2_cur_pdu_buflen() - Get len of current SMB2 PDU buffer
> + * This returns the lenght including any possible padding.
> + * @work: smb work containing request buffer
> + */
> +unsigned int ksmbd_smb2_cur_pdu_buflen(struct ksmbd_work *work)
> +{
This patch will cause unused function build warning. so need to
combine it with "ksmbd: use ksmbd_smb2_cur_pdu_buflen() in
ksmbd_smb2_check_message() "

Thanks!
> +	struct smb2_hdr *hdr = ksmbd_req_buf_next(work);
> +	unsigned int buf_len;
> +	unsigned int pdu_len;
> +
> +	if (hdr->NextCommand != 0) {
> +		/*
> +		 * hdr->NextCommand has already been validated by
> +		 * init_chained_smb2_rsp().
> +		 */
> +		return __le32_to_cpu(hdr->NextCommand);
> +	}
> +
> +	buf_len = get_rfc1002_len(work->request_buf);
> +	pdu_len = buf_len - work->next_smb2_rcv_hdr_off;
> +	return pdu_len;
> +}
> +
> diff --git a/fs/ksmbd/smb2pdu.h b/fs/ksmbd/smb2pdu.h
> index a6dec5ec6a54..c5fa8256b0bb 100644
> --- a/fs/ksmbd/smb2pdu.h
> +++ b/fs/ksmbd/smb2pdu.h
> @@ -1680,6 +1680,7 @@ int smb2_set_rsp_credits(struct ksmbd_work *work);
>
>  /* smb2 misc functions */
>  int ksmbd_smb2_check_message(struct ksmbd_work *work);
> +unsigned int ksmbd_smb2_cur_pdu_buflen(struct ksmbd_work *work);
>
>  /* smb2 command handlers */
>  int smb2_handle_negotiate(struct ksmbd_work *work);
> --
> 2.31.1
>
>

Re: [PATCH v5 14/20] ksmbd: add ksmbd_smb2_cur_pdu_buflen()

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 1491 bytes --]

Am 02.10.21 um 07:49 schrieb Namjae Jeon:
> 2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/smb2misc.c | 25 +++++++++++++++++++++++++
>>   fs/ksmbd/smb2pdu.h  |  1 +
>>   2 files changed, 26 insertions(+)
>>
>> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
>> index 2cc031c39514..76f53db7db8d 100644
>> --- a/fs/ksmbd/smb2misc.c
>> +++ b/fs/ksmbd/smb2misc.c
>> @@ -427,3 +427,28 @@ int smb2_negotiate_request(struct ksmbd_work *work)
>>   {
>>   	return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE);
>>   }
>> +
>> +/**
>> + * ksmbd_smb2_cur_pdu_buflen() - Get len of current SMB2 PDU buffer
>> + * This returns the lenght including any possible padding.
>> + * @work: smb work containing request buffer
>> + */
>> +unsigned int ksmbd_smb2_cur_pdu_buflen(struct ksmbd_work *work)
>> +{
> This patch will cause unused function build warning. so need to
> combine it with "ksmbd: use ksmbd_smb2_cur_pdu_buflen() in
> ksmbd_smb2_check_message() "

ok, going to squash this into another commit that uses the function.

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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[PATCH v5 15/20] ksmbd: use ksmbd_smb2_cur_pdu_buflen() in ksmbd_smb2_check_message()

[Ralph Boehme]

No change in behaviour.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2misc.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 76f53db7db8d..7ed266eb6c5e 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -333,14 +333,7 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 	struct smb2_hdr *hdr = &pdu->hdr;
 	int command;
 	__u32 clc_len;  /* calculated length */
-	__u32 len = get_rfc1002_len(pdu);
-
-	if (le32_to_cpu(hdr->NextCommand) > 0) {
-		len = le32_to_cpu(hdr->NextCommand);
-	} else if (work->next_smb2_rcv_hdr_off) {
-		len -= work->next_smb2_rcv_hdr_off;
-		len = round_up(len, 8);
-	}
+	__u32 len = ksmbd_smb2_cur_pdu_buflen(work);
 
 	if (check_smb2_hdr(hdr))
 		return 1;
@@ -395,7 +388,7 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 		 * Some windows servers (win2016) will pad also the final
 		 * PDU in a compound to 8 bytes.
 		 */
-		if (ALIGN(clc_len, 8) == len)
+		if (ALIGN(clc_len, 8) == ALIGN(len, 8))
 			return 0;
 
 		/*
-- 
2.31.1

[PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Ralph Boehme]

Note: we already have the same check in is_chained_smb2_message(), but there it
only applies to compound requests, so we have to repeat the check here to cover
both cases.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2misc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 7ed266eb6c5e..541b39b7a84b 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 	if (check_smb2_hdr(hdr))
 		return 1;
 
+	if (len < sizeof(struct smb2_pdu) - 4)
+		return 1;
+
 	if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 		ksmbd_debug(SMB, "Illegal structure size %u\n",
 			    le16_to_cpu(hdr->StructureSize));
-- 
2.31.1

Re: [PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Note: we already have the same check in is_chained_smb2_message(), but there
> it
> only applies to compound requests, so we have to repeat the check here to
> cover
> both cases.
>
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/smb2misc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
> index 7ed266eb6c5e..541b39b7a84b 100644
> --- a/fs/ksmbd/smb2misc.c
> +++ b/fs/ksmbd/smb2misc.c
> @@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
>  	if (check_smb2_hdr(hdr))
>  		return 1;
>
> +	if (len < sizeof(struct smb2_pdu) - 4)
> +		return 1;
when only this patch is applied, how can you guarantee that session id
and tree id of smb2 header are vaild ?

> +
>  	if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
>  		ksmbd_debug(SMB, "Illegal structure size %u\n",
>  			    le16_to_cpu(hdr->StructureSize));
> --
> 2.31.1
>
>

Re: [PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 1388 bytes --]

Am 02.10.21 um 07:55 schrieb Namjae Jeon:
> 2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
>> Note: we already have the same check in is_chained_smb2_message(), but there
>> it
>> only applies to compound requests, so we have to repeat the check here to
>> cover
>> both cases.
>>
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/smb2misc.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
>> index 7ed266eb6c5e..541b39b7a84b 100644
>> --- a/fs/ksmbd/smb2misc.c
>> +++ b/fs/ksmbd/smb2misc.c
>> @@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
>>   	if (check_smb2_hdr(hdr))
>>   		return 1;
>>
>> +	if (len < sizeof(struct smb2_pdu) - 4)
>> +		return 1;
> when only this patch is applied, how can you guarantee that session id
> and tree id of smb2 header are vaild ?

what do you mean? This just checks the actual packet lenght is large 
enough to access the header and the body lenght field.

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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Re: [PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Hyunchul Lee]

Hi Ralph,

2021년 10월 1일 (금) 오후 9:25, Ralph Boehme <slow@samba.org>님이 작성:
>
> Note: we already have the same check in is_chained_smb2_message(), but there it
> only applies to compound requests, so we have to repeat the check here to cover
> both cases.
>
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/smb2misc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
> index 7ed266eb6c5e..541b39b7a84b 100644
> --- a/fs/ksmbd/smb2misc.c
> +++ b/fs/ksmbd/smb2misc.c
> @@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
>         if (check_smb2_hdr(hdr))
>                 return 1;
>
> +       if (len < sizeof(struct smb2_pdu) - 4)
> +               return 1;
> +

Do we need this check before accessing any fields of smb2_hdr in
ksmbd_verify_smb_message()?

>         if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
>                 ksmbd_debug(SMB, "Illegal structure size %u\n",
>                             le16_to_cpu(hdr->StructureSize));
> --
> 2.31.1
>


-- 
Thanks,
Hyunchul

Re: [PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 1489 bytes --]

Am 02.10.21 um 14:45 schrieb Hyunchul Lee:
> Hi Ralph,
> 
> 2021년 10월 1일 (금) 오후 9:25, Ralph Boehme <slow@samba.org>님이 작성:
>>
>> Note: we already have the same check in is_chained_smb2_message(), but there it
>> only applies to compound requests, so we have to repeat the check here to cover
>> both cases.
>>
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/smb2misc.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
>> index 7ed266eb6c5e..541b39b7a84b 100644
>> --- a/fs/ksmbd/smb2misc.c
>> +++ b/fs/ksmbd/smb2misc.c
>> @@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
>>          if (check_smb2_hdr(hdr))
>>                  return 1;
>>
>> +       if (len < sizeof(struct smb2_pdu) - 4)
>> +               return 1;
>> +
> 
> Do we need this check before accessing any fields of smb2_hdr in
> ksmbd_verify_smb_message()?

well, my idea was to have the core PDU size checking logic in 
ksmbd_smb2_check_message() and ksmbd_verify_smb_message() merely 
switches between SMB1/SMB2.

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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Re: [PATCH v5 16/20] ksmbd: check PDU len is at least header plus body size in ksmbd_smb2_check_message()

[Namjae Jeon]

2021-10-02 21:49 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Am 02.10.21 um 14:45 schrieb Hyunchul Lee:
>> Hi Ralph,
>>
>> 2021년 10월 1일 (금) 오후 9:25, Ralph Boehme <slow@samba.org>님이 작성:
>>>
>>> Note: we already have the same check in is_chained_smb2_message(), but
>>> there it
>>> only applies to compound requests, so we have to repeat the check here to
>>> cover
>>> both cases.
>>>
>>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>>> Cc: Tom Talpey <tom@talpey.com>
>>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>>> Cc: Steve French <smfrench@gmail.com>
>>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>>> Signed-off-by: Ralph Boehme <slow@samba.org>
>>> ---
>>>   fs/ksmbd/smb2misc.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
>>> index 7ed266eb6c5e..541b39b7a84b 100644
>>> --- a/fs/ksmbd/smb2misc.c
>>> +++ b/fs/ksmbd/smb2misc.c
>>> @@ -338,6 +338,9 @@ int ksmbd_smb2_check_message(struct ksmbd_work
>>> *work)
>>>          if (check_smb2_hdr(hdr))
>>>                  return 1;
>>>
>>> +       if (len < sizeof(struct smb2_pdu) - 4)
>>> +               return 1;
>>> +
>>
>> Do we need this check before accessing any fields of smb2_hdr in
>> ksmbd_verify_smb_message()?
>
> well, my idea was to have the core PDU size checking logic in
> ksmbd_smb2_check_message() and ksmbd_verify_smb_message() merely
> switches between SMB1/SMB2.
Hyunchul  pointed out that this header buffer check should be moved to
the above check_smb2_hdr(). I think that it should be move to the
above ksmbd_smb2_cur_pdu_buflen().

>
> -slow
>
> --
> Ralph Boehme, Samba Team                 https://samba.org/
> SerNet Samba Team Lead      https://sernet.de/en/team-samba
>

[PATCH v5 17/20] ksmdb: use cmd helper variable in smb2_get_ksmbd_tcon()

[Ralph Boehme]

No change in behaviour.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2pdu.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index b06361313889..7d3344b5519c 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -94,12 +94,13 @@ struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn
 int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
 {
 	struct smb2_hdr *req_hdr = work->request_buf;
+	unsigned int cmd = le16_to_cpu(req_hdr->Command);
 	int tree_id;
 
 	work->tcon = NULL;
-	if (work->conn->ops->get_cmd_val(work) == SMB2_TREE_CONNECT_HE ||
-	    work->conn->ops->get_cmd_val(work) ==  SMB2_CANCEL_HE ||
-	    work->conn->ops->get_cmd_val(work) ==  SMB2_LOGOFF_HE) {
+	if (cmd == SMB2_TREE_CONNECT_HE ||
+	    cmd ==  SMB2_CANCEL_HE ||
+	    cmd ==  SMB2_LOGOFF_HE) {
 		ksmbd_debug(SMB, "skip to check tree connect request\n");
 		return 0;
 	}
-- 
2.31.1

[PATCH v5 18/20] ksmdb: make smb2_get_ksmbd_tcon() callable with chained PDUs

[Ralph Boehme]

Also track the tcon id of compound requests.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/ksmbd_work.h | 1 +
 fs/ksmbd/smb2pdu.c    | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/ksmbd_work.h b/fs/ksmbd/ksmbd_work.h
index f7156bc50049..91363d508909 100644
--- a/fs/ksmbd/ksmbd_work.h
+++ b/fs/ksmbd/ksmbd_work.h
@@ -46,6 +46,7 @@ struct ksmbd_work {
 	u64				compound_fid;
 	u64				compound_pfid;
 	u64				compound_sid;
+	u32				compound_tid;
 
 	const struct cred		*saved_cred;
 
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 7d3344b5519c..5b1fead05c49 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -98,6 +98,8 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
 	int tree_id;
 
 	work->tcon = NULL;
+	work->compound_tid = 0;
+
 	if (cmd == SMB2_TREE_CONNECT_HE ||
 	    cmd ==  SMB2_CANCEL_HE ||
 	    cmd ==  SMB2_LOGOFF_HE) {
@@ -110,13 +112,18 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
 		return -ENOENT;
 	}
 
-	tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
+	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
+		tree_id = work->compound_tid;
+	else
+		tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
+
 	work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
 	if (!work->tcon) {
 		pr_err("Invalid tid %d\n", tree_id);
 		return -EINVAL;
 	}
 
+	work->compound_tid = tree_id;
 	return 1;
 }
 
-- 
2.31.1

Re: [PATCH v5 18/20] ksmdb: make smb2_get_ksmbd_tcon() callable with chained PDUs

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Also track the tcon id of compound requests.
>
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/ksmbd_work.h | 1 +
>  fs/ksmbd/smb2pdu.c    | 9 ++++++++-
>  2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ksmbd/ksmbd_work.h b/fs/ksmbd/ksmbd_work.h
> index f7156bc50049..91363d508909 100644
> --- a/fs/ksmbd/ksmbd_work.h
> +++ b/fs/ksmbd/ksmbd_work.h
> @@ -46,6 +46,7 @@ struct ksmbd_work {
>  	u64				compound_fid;
>  	u64				compound_pfid;
>  	u64				compound_sid;
> +	u32				compound_tid;
>
>  	const struct cred		*saved_cred;
>
> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
> index 7d3344b5519c..5b1fead05c49 100644
> --- a/fs/ksmbd/smb2pdu.c
> +++ b/fs/ksmbd/smb2pdu.c
> @@ -98,6 +98,8 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
>  	int tree_id;
>
>  	work->tcon = NULL;
> +	work->compound_tid = 0;
> +
>  	if (cmd == SMB2_TREE_CONNECT_HE ||
>  	    cmd ==  SMB2_CANCEL_HE ||
>  	    cmd ==  SMB2_LOGOFF_HE) {
> @@ -110,13 +112,18 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
>  		return -ENOENT;
>  	}
>
> -	tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
> +	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
> +		tree_id = work->compound_tid;
Well, Isn't that a performance degradation due to unneeded lookups?
> +	else
> +		tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
> +
>  	work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
>  	if (!work->tcon) {
>  		pr_err("Invalid tid %d\n", tree_id);
>  		return -EINVAL;
>  	}
>
> +	work->compound_tid = tree_id;
>  	return 1;
>  }
>
> --
> 2.31.1
>
>

Re: [PATCH v5 18/20] ksmdb: make smb2_get_ksmbd_tcon() callable with chained PDUs

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 2018 bytes --]

Am 02.10.21 um 08:00 schrieb Namjae Jeon:
> 2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
>> Also track the tcon id of compound requests.
>>
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/ksmbd_work.h | 1 +
>>   fs/ksmbd/smb2pdu.c    | 9 ++++++++-
>>   2 files changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/ksmbd/ksmbd_work.h b/fs/ksmbd/ksmbd_work.h
>> index f7156bc50049..91363d508909 100644
>> --- a/fs/ksmbd/ksmbd_work.h
>> +++ b/fs/ksmbd/ksmbd_work.h
>> @@ -46,6 +46,7 @@ struct ksmbd_work {
>>   	u64				compound_fid;
>>   	u64				compound_pfid;
>>   	u64				compound_sid;
>> +	u32				compound_tid;
>>
>>   	const struct cred		*saved_cred;
>>
>> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
>> index 7d3344b5519c..5b1fead05c49 100644
>> --- a/fs/ksmbd/smb2pdu.c
>> +++ b/fs/ksmbd/smb2pdu.c
>> @@ -98,6 +98,8 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
>>   	int tree_id;
>>
>>   	work->tcon = NULL;
>> +	work->compound_tid = 0;
>> +
>>   	if (cmd == SMB2_TREE_CONNECT_HE ||
>>   	    cmd ==  SMB2_CANCEL_HE ||
>>   	    cmd ==  SMB2_LOGOFF_HE) {
>> @@ -110,13 +112,18 @@ int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
>>   		return -ENOENT;
>>   	}
>>
>> -	tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
>> +	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
>> +		tree_id = work->compound_tid;
> Well, Isn't that a performance degradation due to unneeded lookups?

I wouldn't think that this has any noticable performance impact, has it? 
This way the logic is easy to follow, but I'll rewrite to avoid the 
lookup for related operations.

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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[PATCH v5 19/20] ksmbd: make smb2_check_user_session() callabe for compound PDUs

[Ralph Boehme]

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/smb2pdu.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 5b1fead05c49..ef551e3633db 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -411,7 +411,6 @@ static void init_chained_smb2_rsp(struct ksmbd_work *work)
 		work->compound_pfid =
 			le64_to_cpu(((struct smb2_create_rsp *)rsp)->
 				PersistentFileId);
-		work->compound_sid = le64_to_cpu(rsp->SessionId);
 	}
 
 	len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
@@ -592,6 +591,8 @@ int smb2_check_user_session(struct ksmbd_work *work)
 	unsigned long long sess_id;
 
 	work->sess = NULL;
+	work->compound_sid = 0;
+
 	/*
 	 * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
 	 * require a session id, so no need to validate user session's for
@@ -604,11 +605,17 @@ int smb2_check_user_session(struct ksmbd_work *work)
 	if (!ksmbd_conn_good(work))
 		return -EINVAL;
 
-	sess_id = le64_to_cpu(req_hdr->SessionId);
+	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
+		sess_id = work->compound_sid;
+	else
+		sess_id = le64_to_cpu(req_hdr->SessionId);
+
 	/* Check for validity of user session */
 	work->sess = ksmbd_session_lookup_all(conn, sess_id);
-	if (work->sess)
+	if (work->sess) {
+		work->compound_sid = sess_id;
 		return 1;
+	}
 	ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
 	return -EINVAL;
 }
-- 
2.31.1

Re: [PATCH v5 19/20] ksmbd: make smb2_check_user_session() callabe for compound PDUs

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> Cc: Namjae Jeon <linkinjeon@kernel.org>
> Cc: Tom Talpey <tom@talpey.com>
> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
> Cc: Steve French <smfrench@gmail.com>
> Cc: Hyunchul Lee <hyc.lee@gmail.com>
> Signed-off-by: Ralph Boehme <slow@samba.org>
> ---
>  fs/ksmbd/smb2pdu.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
> index 5b1fead05c49..ef551e3633db 100644
> --- a/fs/ksmbd/smb2pdu.c
> +++ b/fs/ksmbd/smb2pdu.c
> @@ -411,7 +411,6 @@ static void init_chained_smb2_rsp(struct ksmbd_work
> *work)
>  		work->compound_pfid =
>  			le64_to_cpu(((struct smb2_create_rsp *)rsp)->
>  				PersistentFileId);
> -		work->compound_sid = le64_to_cpu(rsp->SessionId);
>  	}
>
>  	len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
> @@ -592,6 +591,8 @@ int smb2_check_user_session(struct ksmbd_work *work)
>  	unsigned long long sess_id;
>
>  	work->sess = NULL;
> +	work->compound_sid = 0;
> +
>  	/*
>  	 * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
>  	 * require a session id, so no need to validate user session's for
> @@ -604,11 +605,17 @@ int smb2_check_user_session(struct ksmbd_work *work)
>  	if (!ksmbd_conn_good(work))
>  		return -EINVAL;
>
> -	sess_id = le64_to_cpu(req_hdr->SessionId);
> +	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
> +		sess_id = work->compound_sid;
same comment with previous tree id patch.
> +	else
> +		sess_id = le64_to_cpu(req_hdr->SessionId);
> +
>  	/* Check for validity of user session */
>  	work->sess = ksmbd_session_lookup_all(conn, sess_id);
> -	if (work->sess)
> +	if (work->sess) {
> +		work->compound_sid = sess_id;
>  		return 1;
> +	}
>  	ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
>  	return -EINVAL;
>  }
> --
> 2.31.1
>
>

Re: [PATCH v5 19/20] ksmbd: make smb2_check_user_session() callabe for compound PDUs

[Ralph Boehme]

[-- Attachment #1.1: Type: text/plain, Size: 1810 bytes --]

Am 02.10.21 um 08:01 schrieb Namjae Jeon:
> 2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
>> Cc: Namjae Jeon <linkinjeon@kernel.org>
>> Cc: Tom Talpey <tom@talpey.com>
>> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
>> Cc: Steve French <smfrench@gmail.com>
>> Cc: Hyunchul Lee <hyc.lee@gmail.com>
>> Signed-off-by: Ralph Boehme <slow@samba.org>
>> ---
>>   fs/ksmbd/smb2pdu.c | 13 ++++++++++---
>>   1 file changed, 10 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
>> index 5b1fead05c49..ef551e3633db 100644
>> --- a/fs/ksmbd/smb2pdu.c
>> +++ b/fs/ksmbd/smb2pdu.c
>> @@ -411,7 +411,6 @@ static void init_chained_smb2_rsp(struct ksmbd_work
>> *work)
>>   		work->compound_pfid =
>>   			le64_to_cpu(((struct smb2_create_rsp *)rsp)->
>>   				PersistentFileId);
>> -		work->compound_sid = le64_to_cpu(rsp->SessionId);
>>   	}
>>
>>   	len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
>> @@ -592,6 +591,8 @@ int smb2_check_user_session(struct ksmbd_work *work)
>>   	unsigned long long sess_id;
>>
>>   	work->sess = NULL;
>> +	work->compound_sid = 0;
>> +
>>   	/*
>>   	 * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
>>   	 * require a session id, so no need to validate user session's for
>> @@ -604,11 +605,17 @@ int smb2_check_user_session(struct ksmbd_work *work)
>>   	if (!ksmbd_conn_good(work))
>>   		return -EINVAL;
>>
>> -	sess_id = le64_to_cpu(req_hdr->SessionId);
>> +	if (req_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)
>> +		sess_id = work->compound_sid;
> same comment with previous tree id patch.

same answer. :)

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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[PATCH v5 20/20] ksmdb: move session and tcon validation to ksmbd_smb2_check_message()

[Ralph Boehme]

For compound non-related operations session id and tree id must be taken from
earch PDU.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Steve French <smfrench@gmail.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
---
 fs/ksmbd/server.c   | 17 -----------------
 fs/ksmbd/smb2misc.c | 20 ++++++++++++++++++++
 2 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c
index 328c4225cec1..8b638c701b7f 100644
--- a/fs/ksmbd/server.c
+++ b/fs/ksmbd/server.c
@@ -184,23 +184,6 @@ static void __handle_ksmbd_work(struct ksmbd_work *work,
 		goto send;
 	}
 
-	if (conn->ops->check_user_session) {
-		rc = conn->ops->check_user_session(work);
-		if (rc < 0) {
-			command = conn->ops->get_cmd_val(work);
-			conn->ops->set_rsp_status(work,
-					STATUS_USER_SESSION_DELETED);
-			goto send;
-		} else if (rc > 0) {
-			rc = conn->ops->get_ksmbd_tcon(work);
-			if (rc < 0) {
-				conn->ops->set_rsp_status(work,
-					STATUS_NETWORK_NAME_DELETED);
-				goto send;
-			}
-		}
-	}
-
 	do {
 		rc = __process_request(work, conn, &command);
 		if (rc == SERVER_HANDLER_ABORT)
diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index 541b39b7a84b..d0a3fbf7bc89 100644
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -334,6 +334,7 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 	int command;
 	__u32 clc_len;  /* calculated length */
 	__u32 len = ksmbd_smb2_cur_pdu_buflen(work);
+	int rc;
 
 	if (check_smb2_hdr(hdr))
 		return 1;
@@ -416,6 +417,25 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 		return 1;
 	}
 
+	if (work->conn->ops->check_user_session == NULL)
+		return 0;
+
+	rc = work->conn->ops->check_user_session(work);
+	if (rc < 0) {
+		work->conn->ops->set_rsp_status(work,
+						STATUS_USER_SESSION_DELETED);
+		return 1;
+	}
+	if (rc == 0)
+		return 0;
+
+	rc = work->conn->ops->get_ksmbd_tcon(work);
+	if (rc < 0) {
+		work->conn->ops->set_rsp_status(work,
+						STATUS_NETWORK_NAME_DELETED);
+		return 1;
+	}
+
 	return 0;
 }
 
-- 
2.31.1

Re: [PATCH v5 00/20] Buffer validation patches

[Namjae Jeon]

2021-10-01 21:04 GMT+09:00, Ralph Boehme <slow@samba.org>:
> v2:
>   - update comments of smb2_get_data_area_len().
>   - fix wrong buffer size check in fsctl_query_iface_info_ioctl().
>   - fix 32bit overflow in smb2_set_info.
>
> v3:
>   - add buffer check for ByteCount of smb negotiate request.
>   - Moved buffer check of to the top of loop to avoid unneeded behavior
> when
>     out_buf_len is smaller than network_interface_info_ioctl_rsp.
>   - get correct out_buf_len which doesn't exceed max stream protocol
> length.
>   - subtract single smb2_lock_element for correct buffer size check in
>     ksmbd_smb2_check_message().
>
> v4:
>   - use work->response_sz for out_buf_len calculation in smb2_ioctl.
>   - move smb2_neg size check to above to validate NegotiateContextOffset
>     field.
>   - remove unneeded dialect checks in smb2_sess_setup() and
>     smb2_handle_negotiate().
>   - split smb2_set_info patch into two patches(declaring
>     smb2_file_basic_info and buffer check)
>
> v5:
>   - remove PDU size validation from ksmbd_conn_handler_loop()
>   - add PDU size validation to ksmbd_smb2_check_message()
>   - fix compound non-related request handling
Hi Ralph,

Have you tested this patch-set ? When I tried to run xfstests test,
kernel oops happen.
Can you run xfstests and check kernel oops  ?

These are my xfstests command and tests.

sudo ./check cifs/001 generic/001 generic/002 generic/005 generic/006
generic/007 generic/008 generic/011 generic/013 generic/014
generic/020 generic/023 generic/024 generic/028 generic/029
generic/030 generic/032 generic/033 generic/036 generic/037
generic/069 generic/070 generic/071 generic/074 generic/080
generic/084 generic/086 generic/095 generic/098 generic/100
generic/103 generic/109 generic/113 generic/117 generic/124
generic/125 generic/129 generic/130 generic/132 generic/133
generic/135 generic/141 generic/169 generic/198 generic/207
generic/208 generic/210 generic/211 generic/212 generic/214
generic/215 generic/221 generic/225 generic/228 generic/236
generic/239 generic/241 generic/245 generic/246 generic/247
generic/248 generic/249 generic/257 generic/258 generic/286
generic/308 generic/309 generic/310 generic/313 generic/315
generic/316 generic/337 generic/339 generic/340 generic/344
generic/345 generic/346 generic/349 generic/350 generic/354
generic/360 generic/377 generic/391 generic/393 generic/394
generic/406 generic/412 generic/420 generic/422 generic/432
generic/433 generic/436 generic/437 generic/438 generic/439
generic/443 generic/445 generic/446 generic/448 generic/451
generic/452 generic/454 generic/460 generic/464 generic/465
generic/490 generic/504 generic/523 generic/524 generic/533
generic/539 generic/567 generic/568 generic/590 generic/591

Thanks!
>
> Hyunchul Lee (1):
>   ksmbd: add buffer validation for SMB2_CREATE_CONTEXT
>
> Namjae Jeon (9):
>   ksmbd: add the check to vaildate if stream protocol length exceeds
>     maximum value
>   ksmbd: add validation in smb2_ioctl
>   ksmbd: use correct basic info level in set_file_basic_info()
>   ksmbd: add request buffer validation in smb2_set_info
>   ksmbd: check strictly data area in ksmbd_smb2_check_message()
>   ksmbd: add validation in smb2 negotiate
>   ksmbd: remove the leftover of smb2.0 dialect support
>   ksmbd: remove NTLMv1 authentication
>   ksmbd: fix transform header validation
>
> Ralph Boehme (10):
>   ksmbd: use ksmbd_req_buf_next() in ksmbd_smb2_check_message()
>   ksmbd: use ksmbd_req_buf_next() in ksmbd_verify_smb_message()
>   ksmbd: remove ksmbd_verify_smb_message()
>   ksmbd: add ksmbd_smb2_cur_pdu_buflen()
>   ksmbd: use ksmbd_smb2_cur_pdu_buflen() in ksmbd_smb2_check_message()
>   ksmbd: check PDU len is at least header plus body size in
>     ksmbd_smb2_check_message()
>   ksmdb: use cmd helper variable in smb2_get_ksmbd_tcon()
>   ksmdb: make smb2_get_ksmbd_tcon() callable with chained PDUs
>   ksmbd: make smb2_check_user_session() callabe for compound PDUs
>   ksmdb: move session and tcon validation to ksmbd_smb2_check_message()
>
>  fs/ksmbd/auth.c       | 205 ---------------------
>  fs/ksmbd/connection.c |   9 +-
>  fs/ksmbd/crypto_ctx.c |  16 --
>  fs/ksmbd/crypto_ctx.h |   8 -
>  fs/ksmbd/ksmbd_work.h |   1 +
>  fs/ksmbd/oplock.c     |  41 ++++-
>  fs/ksmbd/server.c     |  19 +-
>  fs/ksmbd/smb2misc.c   | 164 ++++++++++-------
>  fs/ksmbd/smb2ops.c    |   5 -
>  fs/ksmbd/smb2pdu.c    | 411 ++++++++++++++++++++++++++++++------------
>  fs/ksmbd/smb2pdu.h    |  11 +-
>  fs/ksmbd/smb_common.c |  68 +++----
>  fs/ksmbd/smb_common.h |   5 +-
>  fs/ksmbd/smbacl.c     |  21 ++-
>  fs/ksmbd/vfs.c        |   2 +-
>  fs/ksmbd/vfs.h        |   2 +-
>  16 files changed, 496 insertions(+), 492 deletions(-)
>
> --
> 2.31.1
>
>