s3:smb2_server: remember the max_{trans,read,write} sizes we negotiated (bug #8473)

We should enforce the negotiated max sizes instead of the
lp_smb2_max_*() sizes.

metze
(cherry picked from commit 40ea66c5dda91ba3f74bed7db1ce02f6c8b4ffeb)
(cherry picked from commit 9c0650a066812dd6306463738c3d5a3823938c2c)

6 files changed, 12 insertions, 8 deletions

diff --git a/source3/smbd/globals.h b/source3/smbd/globals.h
index 70338489402..9304a43cdd3 100644
--- a/source3/smbd/globals.h
+++ b/source3/smbd/globals.h
@@ -604,6 +604,9 @@ struct smbd_server_connection {
 		uint64_t seqnum_low;
 		uint32_t credits_granted;
 		uint32_t max_credits;
+		uint32_t max_trans;
+		uint32_t max_read;
+		uint32_t max_write;
 		struct bitmap *credits_bitmap;
 		bool compound_related_in_progress;
 	} smb2;
diff --git a/source3/smbd/smb2_find.c b/source3/smbd/smb2_find.c
index 4a49f2a7a47..3dcc76862b0 100644
--- a/source3/smbd/smb2_find.c
+++ b/source3/smbd/smb2_find.c
@@ -281,7 +281,7 @@ static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 		return tevent_req_post(req, ev);
 	}
 
-	if (in_output_buffer_length > lp_smb2_max_trans()) {
+	if (in_output_buffer_length > smb2req->sconn->smb2.max_trans) {
 		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 		return tevent_req_post(req, ev);
 	}
diff --git a/source3/smbd/smb2_negprot.c b/source3/smbd/smb2_negprot.c
index a9d432ac76d..2f45b8c756a 100644
--- a/source3/smbd/smb2_negprot.c
+++ b/source3/smbd/smb2_negprot.c
@@ -81,7 +81,6 @@ NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
 	uint32_t max_read = lp_smb2_max_read();
 	uint32_t max_write = lp_smb2_max_write();
 
-
 	status = smbd_smb2_request_verify_sizes(req, 0x24);
 	if (!NT_STATUS_IS_OK(status)) {
 		return smbd_smb2_request_error(req, status);
@@ -185,6 +184,9 @@ NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
 	outdyn = security_buffer;
 
 	req->sconn->using_smb2 = true;
+	req->sconn->smb2.max_trans = max_trans;
+	req->sconn->smb2.max_read  = max_read;
+	req->sconn->smb2.max_write = max_write;
 
 	return smbd_smb2_request_done(req, outbody, &outdyn);
 }
diff --git a/source3/smbd/smb2_notify.c b/source3/smbd/smb2_notify.c
index a8b1eb433ab..49c6a544972 100644
--- a/source3/smbd/smb2_notify.c
+++ b/source3/smbd/smb2_notify.c
@@ -73,7 +73,7 @@ NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
 	 * 0x00010000 is what Windows 7 uses,
 	 * Windows 2008 uses 0x00080000
 	 */
-	if (in_output_buffer_length > lp_smb2_max_trans()) {
+	if (in_output_buffer_length > req->sconn->smb2.max_trans) {
 		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 	}
 
diff --git a/source3/smbd/smb2_read.c b/source3/smbd/smb2_read.c
index 89fc420cd32..21082e67cd8 100644
--- a/source3/smbd/smb2_read.c
+++ b/source3/smbd/smb2_read.c
@@ -74,9 +74,9 @@ NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
 	in_remaining_bytes	= IVAL(inbody, 0x28);
 
 	/* check the max read size */
-	if (in_length > lp_smb2_max_read()) {
+	if (in_length > req->sconn->smb2.max_read) {
 		DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
-			__location__, in_length, lp_smb2_max_read()));
+			__location__, in_length, req->sconn->smb2.max_read));
 		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 	}
 
diff --git a/source3/smbd/smb2_write.c b/source3/smbd/smb2_write.c
index 020209892b1..3a6ea9bfdbf 100644
--- a/source3/smbd/smb2_write.c
+++ b/source3/smbd/smb2_write.c
@@ -78,11 +78,10 @@ NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
 	}
 
 	/* check the max write size */
-	if (in_data_length > lp_smb2_max_write()) {
-		/* This is a warning. */
+	if (in_data_length > req->sconn->smb2.max_write) {
 		DEBUG(2,("smbd_smb2_request_process_write : "
 			"client ignored max write :%s: 0x%08X: 0x%08X\n",
-			__location__, in_data_length, lp_smb2_max_write()));
+			__location__, in_data_length, req->sconn->smb2.max_write));
 #if 0
 		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 #endif