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s3:smbd: add infrastructure for SMB2 support
This is disabled by default and activated by "max protocol = SMB2". metze
This commit is contained in:
Stefan Metzmacher
parent
d23a1935e8
commit
688945a994
@ -748,6 +748,7 @@ SMBD_OBJ_SRV = smbd/files.o smbd/chgpasswd.o smbd/connection.o \
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smbd/dmapi.o smbd/signing.o \
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smbd/file_access.o \
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smbd/dnsregister.o smbd/globals.o \
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smbd/smb2_server.o \
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$(MANGLE_OBJ) @VFS_STATIC@
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SMBD_OBJ_BASE = $(PARAM_WITHOUT_REG_OBJ) $(SMBD_OBJ_SRV) $(LIBSMB_OBJ) \
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@ -199,11 +199,87 @@ struct child_pid;
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extern struct child_pid *children;
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extern int num_children;
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struct tstream_context;
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struct smbd_smb2_request;
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bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size);
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void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
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const uint8_t *inbuf, size_t size);
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NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
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NTSTATUS status, DATA_BLOB *info);
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NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
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NTSTATUS status);
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NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
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DATA_BLOB body, DATA_BLOB *dyn);
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struct smbd_smb2_request {
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TALLOC_CTX *mem_pool;
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struct smbd_server_connection *conn;
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int current_idx;
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struct {
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/* the NBT header is not allocated */
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uint8_t nbt_hdr[4];
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/*
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* vector[0] NBT
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* .
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* vector[1] SMB2
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* vector[2] fixed body
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* vector[3] dynamic body
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* .
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* .
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* .
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* vector[4] SMB2
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* vector[5] fixed body
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* vector[6] dynamic body
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* .
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* .
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* .
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*/
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struct iovec *vector;
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int vector_count;
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} in;
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struct {
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/* the NBT header is not allocated */
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uint8_t nbt_hdr[4];
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/*
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* vector[0] NBT
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* .
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* vector[1] SMB2
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* vector[2] fixed body
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* vector[3] dynamic body
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* .
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* .
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* .
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* vector[4] SMB2
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* vector[5] fixed body
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* vector[6] dynamic body
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* .
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* .
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* .
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*/
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struct iovec *vector;
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int vector_count;
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} out;
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};
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struct smbd_server_connection {
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struct fd_event *fde;
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uint64_t num_requests;
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struct smb_signing_state *signing_state;
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bool allow_smb2;
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struct {
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struct tevent_context *event_ctx;
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struct tevent_queue *recv_queue;
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struct tevent_queue *send_queue;
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struct tstream_context *stream;
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} smb2;
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};
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extern struct smbd_server_connection *smbd_server_conn;
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void smbd_init_globals(void);
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@ -1448,6 +1448,14 @@ static void process_smb(struct smbd_server_connection *conn,
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goto done;
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}
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if (smbd_server_conn->allow_smb2) {
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if (smbd_is_smb2_header(inbuf, nread)) {
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smbd_smb2_first_negprot(smbd_server_conn, inbuf, nread);
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return;
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}
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smbd_server_conn->allow_smb2 = false;
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}
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show_msg((char *)inbuf);
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construct_reply((char *)inbuf,nread,unread_bytes,seqnum,encrypted,deferred_pcd);
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@ -2009,6 +2017,10 @@ void smbd_process(void)
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exit_server("failed to create smbd_server_connection");
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}
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if (lp_maxprotocol() == PROTOCOL_SMB2) {
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smbd_server_conn->allow_smb2 = true;
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}
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/* Ensure child is set to blocking mode */
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set_blocking(smbd_server_fd(),True);
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961
source3/smbd/smb2_server.c
Normal file
961
source3/smbd/smb2_server.c
Normal file
@ -0,0 +1,961 @@
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/*
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Unix SMB/CIFS implementation.
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Core SMB2 server
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Copyright (C) Stefan Metzmacher 2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/globals.h"
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#include "../source4/libcli/smb2/smb2_constants.h"
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#include "../lib/tsocket/tsocket.h"
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bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
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{
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if (size < (4 + SMB2_HDR_BODY)) {
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return false;
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}
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if (IVAL(inbuf, 4) != SMB2_MAGIC) {
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return false;
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}
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return true;
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}
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static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
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{
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NTSTATUS status;
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int ret;
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TALLOC_FREE(conn->fde);
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conn->smb2.event_ctx = smbd_event_context();
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conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
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if (conn->smb2.recv_queue == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
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if (conn->smb2.send_queue == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
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&conn->smb2.stream);
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if (ret == -1) {
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status = map_nt_error_from_unix(errno);
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return status;
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}
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/* Ensure child is set to non-blocking mode */
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set_blocking(smbd_server_fd(),false);
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return NT_STATUS_OK;
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}
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#define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
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#define _smb2_setlen(_buf,len) do { \
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uint8_t *buf = (uint8_t *)_buf; \
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buf[0] = 0; \
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buf[1] = ((len)&0xFF0000)>>16; \
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buf[2] = ((len)&0xFF00)>>8; \
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buf[3] = (len)&0xFF; \
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} while (0)
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static void smb2_setup_nbt_length(struct iovec *vector, int count)
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{
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size_t len = 0;
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int i;
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for (i=1; i < count; i++) {
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len += vector[i].iov_len;
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}
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_smb2_setlen(vector[0].iov_base, len);
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}
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static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
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const uint8_t *inbuf, size_t size,
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struct smbd_smb2_request **_req)
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{
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TALLOC_CTX *mem_pool;
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struct smbd_smb2_request *req;
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uint32_t protocol_version;
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const uint8_t *inhdr = NULL;
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off_t ofs = 0;
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uint16_t cmd;
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uint32_t next_command_ofs;
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if (size < (4 + SMB2_HDR_BODY + 2)) {
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DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
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return NT_STATUS_INVALID_PARAMETER;
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}
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inhdr = inbuf + 4;
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protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
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if (protocol_version != SMB2_MAGIC) {
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DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
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protocol_version));
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return NT_STATUS_INVALID_PARAMETER;
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}
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cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
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if (cmd != SMB2_OP_NEGPROT) {
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DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
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cmd));
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return NT_STATUS_INVALID_PARAMETER;
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}
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next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
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if (next_command_ofs != 0) {
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DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
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next_command_ofs));
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return NT_STATUS_INVALID_PARAMETER;
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}
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mem_pool = talloc_pool(conn, 8192);
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if (mem_pool == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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req = talloc_zero(mem_pool, struct smbd_smb2_request);
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if (req == NULL) {
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talloc_free(mem_pool);
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return NT_STATUS_NO_MEMORY;
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}
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req->mem_pool = mem_pool;
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req->conn = conn;
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talloc_steal(req, inbuf);
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req->in.vector = talloc_array(req, struct iovec, 4);
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if (req->in.vector == NULL) {
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talloc_free(mem_pool);
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return NT_STATUS_NO_MEMORY;
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}
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req->in.vector_count = 4;
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memcpy(req->in.nbt_hdr, inbuf, 4);
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ofs = 0;
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req->in.vector[0].iov_base = (void *)req->in.nbt_hdr;
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req->in.vector[0].iov_len = 4;
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ofs += req->in.vector[0].iov_len;
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req->in.vector[1].iov_base = (void *)(inbuf + ofs);
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req->in.vector[1].iov_len = SMB2_HDR_BODY;
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ofs += req->in.vector[1].iov_len;
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req->in.vector[2].iov_base = (void *)(inbuf + ofs);
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req->in.vector[2].iov_len = SVAL(inbuf, ofs) & 0xFFFE;
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ofs += req->in.vector[2].iov_len;
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if (ofs > size) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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req->in.vector[3].iov_base = (void *)(inbuf + ofs);
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req->in.vector[3].iov_len = size - ofs;
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ofs += req->in.vector[3].iov_len;
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req->current_idx = 1;
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*_req = req;
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return NT_STATUS_OK;
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}
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static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
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{
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struct iovec *vector;
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int count;
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int idx;
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count = req->in.vector_count;
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vector = talloc_array(req, struct iovec, count);
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if (vector == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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vector[0].iov_base = req->out.nbt_hdr;
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vector[0].iov_len = 4;
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SIVAL(req->out.nbt_hdr, 0, 0);
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for (idx=1; idx < count; idx += 3) {
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const uint8_t *inhdr = NULL;
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uint8_t *outhdr = NULL;
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uint8_t *outbody = NULL;
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uint8_t *outdyn = NULL;
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size_t outdyn_size = 1;
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uint32_t next_command_ofs = 0;
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struct iovec *current = &vector[idx];
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if ((idx + 3) < count) {
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/* we have a next command */
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next_command_ofs = SMB2_HDR_BODY + 8 + 8;
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outdyn_size = 8;
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}
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inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
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outhdr = talloc_array(vector, uint8_t,
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SMB2_HDR_BODY + 8 + outdyn_size);
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if (outhdr == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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outbody = outhdr + SMB2_HDR_BODY;
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outdyn = outbody + 8;
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current[0].iov_base = (void *)outhdr;
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current[0].iov_len = SMB2_HDR_BODY;
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current[1].iov_base = (void *)outbody;
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current[1].iov_len = 8;
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current[2].iov_base = (void *)outdyn;
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current[2].iov_len = outdyn_size;
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/* setup the SMB2 header */
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SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
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SSVAL(outhdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
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SSVAL(outhdr, SMB2_HDR_EPOCH, 0);
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SIVAL(outhdr, SMB2_HDR_STATUS,
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NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
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SSVAL(outhdr, SMB2_HDR_OPCODE,
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SVAL(inhdr, SMB2_HDR_OPCODE));
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SSVAL(outhdr, SMB2_HDR_CREDIT, 0);
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SIVAL(outhdr, SMB2_HDR_FLAGS, SMB2_HDR_FLAG_REDIRECT);
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SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
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SIVAL(outhdr, SMB2_HDR_MESSAGE_ID,
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IVAL(inhdr, SMB2_HDR_MESSAGE_ID));
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SIVAL(outhdr, SMB2_HDR_PID,
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IVAL(inhdr, SMB2_HDR_PID));
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SIVAL(outhdr, SMB2_HDR_TID,
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IVAL(inhdr, SMB2_HDR_TID));
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SIVAL(outhdr, SMB2_HDR_SESSION_ID,
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IVAL(inhdr, SMB2_HDR_SESSION_ID));
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memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
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/* setup error body header */
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SSVAL(outbody, 0x00, 9);
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SSVAL(outbody, 0x02, 0);
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SIVAL(outbody, 0x04, 0);
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/* setup the dynamic part */
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SCVAL(outdyn, 0x00, 0);
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}
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req->out.vector = vector;
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req->out.vector_count = count;
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/* setup the length of the NBT packet */
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smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
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return NT_STATUS_OK;
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}
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static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
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const char *reason)
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{
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DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
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exit_server_cleanly(reason);
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}
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static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
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{
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const uint8_t *inhdr;
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int i = req->current_idx;
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uint16_t opcode;
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inhdr = (const uint8_t *)req->in.vector[i].iov_base;
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/* TODO: verify more things */
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opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
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DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
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switch (opcode) {
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case SMB2_OP_NEGPROT:
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case SMB2_OP_SESSSETUP:
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case SMB2_OP_LOGOFF:
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case SMB2_OP_TCON:
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case SMB2_OP_TDIS:
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case SMB2_OP_CREATE:
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case SMB2_OP_CLOSE:
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case SMB2_OP_FLUSH:
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case SMB2_OP_READ:
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case SMB2_OP_WRITE:
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case SMB2_OP_LOCK:
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case SMB2_OP_IOCTL:
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case SMB2_OP_CANCEL:
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case SMB2_OP_KEEPALIVE:
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case SMB2_OP_FIND:
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case SMB2_OP_NOTIFY:
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case SMB2_OP_GETINFO:
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case SMB2_OP_SETINFO:
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case SMB2_OP_BREAK:
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return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
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}
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return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
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}
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static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
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static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
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static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
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{
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struct tevent_req *subreq;
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/* TODO: sign the response here */
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smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
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req->current_idx += 3;
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if (req->current_idx > req->in.vector_count) {
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struct timeval zero = timeval_zero();
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subreq = tevent_wakeup_send(req,
|
||||
req->conn->smb2.event_ctx,
|
||||
zero);
|
||||
if (subreq == NULL) {
|
||||
return NT_STATUS_NO_MEMORY;
|
||||
}
|
||||
tevent_req_set_callback(subreq,
|
||||
smbd_smb2_request_dispatch_compound,
|
||||
req);
|
||||
|
||||
return NT_STATUS_OK;
|
||||
}
|
||||
|
||||
subreq = tstream_writev_queue_send(req,
|
||||
req->conn->smb2.event_ctx,
|
||||
req->conn->smb2.stream,
|
||||
req->conn->smb2.send_queue,
|
||||
req->out.vector,
|
||||
req->out.vector_count);
|
||||
if (subreq == NULL) {
|
||||
return NT_STATUS_NO_MEMORY;
|
||||
}
|
||||
tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
|
||||
|
||||
return NT_STATUS_OK;
|
||||
}
|
||||
|
||||
NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
|
||||
NTSTATUS status,
|
||||
DATA_BLOB *info)
|
||||
{
|
||||
uint8_t *outhdr;
|
||||
uint8_t *outbody;
|
||||
int i = req->current_idx;
|
||||
|
||||
DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
|
||||
i, nt_errstr(status), info ? " +info" : ""));
|
||||
|
||||
outhdr = (uint8_t *)req->out.vector[i].iov_base;
|
||||
|
||||
SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
|
||||
|
||||
outbody = outhdr + SMB2_HDR_BODY;
|
||||
|
||||
req->out.vector[i+1].iov_base = (void *)outbody;
|
||||
req->out.vector[i+1].iov_len = 8;
|
||||
|
||||
if (info) {
|
||||
SIVAL(outbody, 0x04, info->length);
|
||||
req->out.vector[i+2].iov_base = (void *)info->data;
|
||||
req->out.vector[i+2].iov_len = info->length;
|
||||
} else {
|
||||
req->out.vector[i+2].iov_base = (void *)(outbody + 8);
|
||||
req->out.vector[i+2].iov_len = 1;
|
||||
}
|
||||
|
||||
/* the error packet is the last response in the chain */
|
||||
SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
|
||||
req->out.vector_count = req->current_idx + 3;
|
||||
|
||||
return smbd_smb2_request_reply(req);
|
||||
}
|
||||
|
||||
NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
|
||||
NTSTATUS status)
|
||||
{
|
||||
return smbd_smb2_request_error_ex(req, status, NULL);
|
||||
}
|
||||
|
||||
NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
|
||||
DATA_BLOB body, DATA_BLOB *dyn)
|
||||
{
|
||||
uint8_t *outhdr;
|
||||
uint8_t *outdyn;
|
||||
int i = req->current_idx;
|
||||
uint32_t next_command_ofs;
|
||||
|
||||
DEBUG(10,("smbd_smb2_request_done: idx[%d] body[%u] dyn[%s:%u]\n",
|
||||
i, (unsigned int)body.length,
|
||||
dyn ? "yes": "no",
|
||||
(unsigned int)(dyn ? dyn->length : 0)));
|
||||
|
||||
if (body.length < 2) {
|
||||
return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
|
||||
}
|
||||
|
||||
if ((body.length % 2) != 0) {
|
||||
return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
|
||||
}
|
||||
|
||||
outhdr = (uint8_t *)req->out.vector[i].iov_base;
|
||||
/* the fallback dynamic buffer */
|
||||
outdyn = outhdr + SMB2_HDR_BODY + 8;
|
||||
|
||||
next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
|
||||
SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(NT_STATUS_OK));
|
||||
|
||||
req->out.vector[i+1].iov_base = (void *)body.data;
|
||||
req->out.vector[i+1].iov_len = body.length;
|
||||
|
||||
if (dyn) {
|
||||
if (dyn->length > 0) {
|
||||
req->out.vector[i+2].iov_base = (void *)dyn->data;
|
||||
req->out.vector[i+2].iov_len = dyn->length;
|
||||
} else {
|
||||
req->out.vector[i+2].iov_base = (void *)outdyn;
|
||||
req->out.vector[i+2].iov_len = 1;
|
||||
}
|
||||
} else {
|
||||
req->out.vector[i+2].iov_base = NULL;
|
||||
req->out.vector[i+2].iov_len = 0;
|
||||
}
|
||||
|
||||
/* see if we need to recalculate the offset to the next response */
|
||||
if (next_command_ofs > 0) {
|
||||
next_command_ofs = SMB2_HDR_BODY;
|
||||
next_command_ofs += req->out.vector[i+1].iov_len;
|
||||
next_command_ofs += req->out.vector[i+2].iov_len;
|
||||
}
|
||||
|
||||
/* TODO: we need to add padding ... */
|
||||
if ((next_command_ofs % 8) != 0) {
|
||||
return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
|
||||
}
|
||||
|
||||
/* the error packet is the last response in the chain */
|
||||
SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
|
||||
|
||||
return smbd_smb2_request_reply(req);
|
||||
}
|
||||
|
||||
static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
|
||||
{
|
||||
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
|
||||
struct smbd_smb2_request);
|
||||
struct smbd_server_connection *conn = req->conn;
|
||||
NTSTATUS status;
|
||||
|
||||
tevent_wakeup_recv(subreq);
|
||||
TALLOC_FREE(subreq);
|
||||
|
||||
DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
|
||||
req->current_idx, req->in.vector_count));
|
||||
|
||||
status = smbd_smb2_request_dispatch(req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
|
||||
{
|
||||
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
|
||||
struct smbd_smb2_request);
|
||||
struct smbd_server_connection *conn = req->conn;
|
||||
int ret;
|
||||
int sys_errno;
|
||||
TALLOC_CTX *mem_pool;
|
||||
|
||||
ret = tstream_writev_queue_recv(subreq, &sys_errno);
|
||||
TALLOC_FREE(subreq);
|
||||
if (ret == -1) {
|
||||
NTSTATUS status = map_nt_error_from_unix(sys_errno);
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
mem_pool = req->mem_pool;
|
||||
req = NULL;
|
||||
talloc_free(mem_pool);
|
||||
}
|
||||
|
||||
struct smbd_smb2_request_read_state {
|
||||
size_t missing;
|
||||
bool asked_for_header;
|
||||
struct smbd_smb2_request *smb2_req;
|
||||
};
|
||||
|
||||
static int smbd_smb2_request_next_vector(struct tstream_context *stream,
|
||||
void *private_data,
|
||||
TALLOC_CTX *mem_ctx,
|
||||
struct iovec **_vector,
|
||||
size_t *_count);
|
||||
static void smbd_smb2_request_read_done(struct tevent_req *subreq);
|
||||
|
||||
static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
|
||||
struct tevent_context *ev,
|
||||
struct smbd_server_connection *conn)
|
||||
{
|
||||
struct tevent_req *req;
|
||||
struct smbd_smb2_request_read_state *state;
|
||||
struct tevent_req *subreq;
|
||||
TALLOC_CTX *mem_pool;
|
||||
|
||||
req = tevent_req_create(mem_ctx, &state,
|
||||
struct smbd_smb2_request_read_state);
|
||||
if (req == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
state->missing = 0;
|
||||
state->asked_for_header = false;
|
||||
|
||||
mem_pool = talloc_pool(state, 8192);
|
||||
if (tevent_req_nomem(mem_pool, req)) {
|
||||
return tevent_req_post(req, ev);
|
||||
}
|
||||
|
||||
state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
|
||||
if (tevent_req_nomem(state->smb2_req, req)) {
|
||||
return tevent_req_post(req, ev);
|
||||
}
|
||||
|
||||
state->smb2_req->mem_pool = mem_pool;
|
||||
state->smb2_req->conn = conn;
|
||||
|
||||
subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
|
||||
conn->smb2.recv_queue,
|
||||
smbd_smb2_request_next_vector,
|
||||
state);
|
||||
if (tevent_req_nomem(subreq, req)) {
|
||||
return tevent_req_post(req, ev);
|
||||
}
|
||||
tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
|
||||
|
||||
return req;
|
||||
}
|
||||
|
||||
static int smbd_smb2_request_next_vector(struct tstream_context *stream,
|
||||
void *private_data,
|
||||
TALLOC_CTX *mem_ctx,
|
||||
struct iovec **_vector,
|
||||
size_t *_count)
|
||||
{
|
||||
struct smbd_smb2_request_read_state *state =
|
||||
talloc_get_type_abort(private_data,
|
||||
struct smbd_smb2_request_read_state);
|
||||
struct smbd_smb2_request *req = state->smb2_req;
|
||||
struct iovec *vector;
|
||||
int idx = req->in.vector_count;
|
||||
size_t len = 0;
|
||||
uint8_t *buf = NULL;
|
||||
|
||||
if (req->in.vector_count == 0) {
|
||||
/*
|
||||
* first we need to get the NBT header
|
||||
*/
|
||||
req->in.vector = talloc_array(req, struct iovec,
|
||||
req->in.vector_count + 1);
|
||||
if (req->in.vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
req->in.vector_count += 1;
|
||||
|
||||
req->in.vector[idx].iov_base = (void *)req->in.nbt_hdr;
|
||||
req->in.vector[idx].iov_len = 4;
|
||||
|
||||
vector = talloc_array(mem_ctx, struct iovec, 1);
|
||||
if (vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
vector[0] = req->in.vector[idx];
|
||||
|
||||
*_vector = vector;
|
||||
*_count = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (req->in.vector_count == 1) {
|
||||
/*
|
||||
* Now we analyze the NBT header
|
||||
*/
|
||||
state->missing = smb2_len(req->in.vector[0].iov_base);
|
||||
|
||||
if (state->missing == 0) {
|
||||
/* if there're no remaining bytes, we're done */
|
||||
*_vector = NULL;
|
||||
*_count = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
req->in.vector = talloc_realloc(req, req->in.vector,
|
||||
struct iovec,
|
||||
req->in.vector_count + 1);
|
||||
if (req->in.vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
req->in.vector_count += 1;
|
||||
|
||||
if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
|
||||
/*
|
||||
* it's a special NBT message,
|
||||
* so get all remaining bytes
|
||||
*/
|
||||
len = state->missing;
|
||||
} else if (state->missing < (SMB2_HDR_BODY + 2)) {
|
||||
/*
|
||||
* it's an invalid message, just read what we can get
|
||||
* and let the caller handle the error
|
||||
*/
|
||||
len = state->missing;
|
||||
} else {
|
||||
/*
|
||||
* We assume it's a SMB2 request,
|
||||
* and we first get the header and the
|
||||
* first 2 bytes (the struct size) of the body
|
||||
*/
|
||||
len = SMB2_HDR_BODY + 2;
|
||||
|
||||
state->asked_for_header = true;
|
||||
}
|
||||
|
||||
state->missing -= len;
|
||||
|
||||
buf = talloc_array(req->in.vector, uint8_t, len);
|
||||
if (buf == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
req->in.vector[idx].iov_base = (void *)buf;
|
||||
req->in.vector[idx].iov_len = len;
|
||||
|
||||
vector = talloc_array(mem_ctx, struct iovec, 1);
|
||||
if (vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
vector[0] = req->in.vector[idx];
|
||||
|
||||
*_vector = vector;
|
||||
*_count = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (state->missing == 0) {
|
||||
/* if there're no remaining bytes, we're done */
|
||||
*_vector = NULL;
|
||||
*_count = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (state->asked_for_header) {
|
||||
const uint8_t *hdr;
|
||||
size_t full_size;
|
||||
size_t next_command_ofs;
|
||||
size_t body_size;
|
||||
uint8_t *body;
|
||||
size_t dyn_size;
|
||||
uint8_t *dyn;
|
||||
bool invalid = false;
|
||||
|
||||
state->asked_for_header = false;
|
||||
|
||||
/*
|
||||
* We got the SMB2 header and the first 2 bytes
|
||||
* of the body. We fix the size to just the header
|
||||
* and manually copy the 2 first bytes to the body section
|
||||
*/
|
||||
req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
|
||||
hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
|
||||
|
||||
/* allocate vectors for body and dynamic areas */
|
||||
req->in.vector = talloc_realloc(req, req->in.vector,
|
||||
struct iovec,
|
||||
req->in.vector_count + 2);
|
||||
if (req->in.vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
req->in.vector_count += 2;
|
||||
|
||||
full_size = state->missing + SMB2_HDR_BODY + 2;
|
||||
next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
|
||||
body_size = SVAL(hdr, SMB2_HDR_BODY);
|
||||
|
||||
if (next_command_ofs != 0) {
|
||||
if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
|
||||
/*
|
||||
* this is invalid, just return a zero
|
||||
* body and let the caller deal with the error
|
||||
*/
|
||||
invalid = true;
|
||||
} else if (next_command_ofs > full_size) {
|
||||
/*
|
||||
* this is invalid, just return a zero
|
||||
* body and let the caller deal with the error
|
||||
*/
|
||||
invalid = true;
|
||||
} else {
|
||||
full_size = next_command_ofs;
|
||||
}
|
||||
}
|
||||
|
||||
if (!invalid) {
|
||||
if (body_size < 2) {
|
||||
/*
|
||||
* this is invalid, just return a zero
|
||||
* body and let the caller deal with the error
|
||||
*/
|
||||
invalid = true;
|
||||
} else if (body_size > (full_size - SMB2_HDR_BODY)) {
|
||||
/*
|
||||
* this is invalid, just return a zero
|
||||
* body and let the caller deal with the error
|
||||
*/
|
||||
invalid = true;
|
||||
}
|
||||
}
|
||||
|
||||
if (invalid) {
|
||||
/* the caller should check this */
|
||||
body_size = 0;
|
||||
}
|
||||
|
||||
if ((body_size % 2) != 0) {
|
||||
body_size -= 1;
|
||||
}
|
||||
|
||||
dyn_size = full_size - (SMB2_HDR_BODY + body_size);
|
||||
|
||||
state->missing -= (body_size - 2) + dyn_size;
|
||||
|
||||
body = talloc_array(req->in.vector, uint8_t, body_size);
|
||||
if (body == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
|
||||
if (dyn == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
req->in.vector[idx].iov_base = (void *)body;
|
||||
req->in.vector[idx].iov_len = body_size;
|
||||
req->in.vector[idx+1].iov_base = (void *)dyn;
|
||||
req->in.vector[idx+1].iov_len = dyn_size;
|
||||
|
||||
vector = talloc_array(mem_ctx, struct iovec, 2);
|
||||
if (vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* the first 2 bytes of the body were already fetched
|
||||
* together with the header
|
||||
*/
|
||||
memcpy(body, hdr + SMB2_HDR_BODY, 2);
|
||||
vector[0].iov_base = body + 2;
|
||||
vector[0].iov_len = req->in.vector[idx].iov_len - 2;
|
||||
|
||||
vector[1] = req->in.vector[idx+1];
|
||||
|
||||
*_vector = vector;
|
||||
*_count = 2;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* when we endup here, we're looking for a new SMB2 request
|
||||
* next. And we ask for its header and the first 2 bytes of
|
||||
* the body (like we did for the first SMB2 request).
|
||||
*/
|
||||
|
||||
req->in.vector = talloc_realloc(req, req->in.vector,
|
||||
struct iovec,
|
||||
req->in.vector_count + 1);
|
||||
if (req->in.vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
req->in.vector_count += 1;
|
||||
|
||||
/*
|
||||
* We assume it's a SMB2 request,
|
||||
* and we first get the header and the
|
||||
* first 2 bytes (the struct size) of the body
|
||||
*/
|
||||
len = SMB2_HDR_BODY + 2;
|
||||
|
||||
if (len > state->missing) {
|
||||
/* let the caller handle the error */
|
||||
len = state->missing;
|
||||
}
|
||||
|
||||
state->missing -= len;
|
||||
state->asked_for_header = true;
|
||||
|
||||
buf = talloc_array(req->in.vector, uint8_t, len);
|
||||
if (buf == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
req->in.vector[idx].iov_base = (void *)buf;
|
||||
req->in.vector[idx].iov_len = len;
|
||||
|
||||
vector = talloc_array(mem_ctx, struct iovec, 1);
|
||||
if (vector == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
vector[0] = req->in.vector[idx];
|
||||
|
||||
*_vector = vector;
|
||||
*_count = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void smbd_smb2_request_read_done(struct tevent_req *subreq)
|
||||
{
|
||||
struct tevent_req *req =
|
||||
tevent_req_callback_data(subreq,
|
||||
struct tevent_req);
|
||||
int ret;
|
||||
int sys_errno;
|
||||
NTSTATUS status;
|
||||
|
||||
ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
|
||||
if (ret == -1) {
|
||||
status = map_nt_error_from_unix(sys_errno);
|
||||
tevent_req_nterror(req, status);
|
||||
return;
|
||||
}
|
||||
|
||||
tevent_req_done(req);
|
||||
}
|
||||
|
||||
static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
|
||||
TALLOC_CTX *mem_ctx,
|
||||
struct smbd_smb2_request **_smb2_req)
|
||||
{
|
||||
struct smbd_smb2_request_read_state *state =
|
||||
tevent_req_data(req,
|
||||
struct smbd_smb2_request_read_state);
|
||||
NTSTATUS status;
|
||||
|
||||
if (tevent_req_is_nterror(req, &status)) {
|
||||
tevent_req_received(req);
|
||||
return status;
|
||||
}
|
||||
|
||||
talloc_steal(mem_ctx, state->smb2_req->mem_pool);
|
||||
*_smb2_req = state->smb2_req;
|
||||
tevent_req_received(req);
|
||||
return NT_STATUS_OK;
|
||||
}
|
||||
|
||||
static void smbd_smb2_request_incoming(struct tevent_req *subreq);
|
||||
|
||||
void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
|
||||
const uint8_t *inbuf, size_t size)
|
||||
{
|
||||
NTSTATUS status;
|
||||
struct smbd_smb2_request *req;
|
||||
struct tevent_req *subreq;
|
||||
|
||||
DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
|
||||
(unsigned int)size));
|
||||
|
||||
status = smbd_initialize_smb2(conn);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
status = smbd_smb2_request_create(conn, inbuf, size, &req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
status = smbd_smb2_request_setup_out(req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
status = smbd_smb2_request_dispatch(req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
/* ask for the next request */
|
||||
subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
|
||||
if (subreq == NULL) {
|
||||
smbd_server_connection_terminate(conn, "no memory for reading");
|
||||
return;
|
||||
}
|
||||
tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
|
||||
}
|
||||
|
||||
static void smbd_smb2_request_incoming(struct tevent_req *subreq)
|
||||
{
|
||||
struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
|
||||
struct smbd_server_connection);
|
||||
NTSTATUS status;
|
||||
struct smbd_smb2_request *req;
|
||||
|
||||
status = smbd_smb2_request_read_recv(subreq, conn, &req);
|
||||
TALLOC_FREE(subreq);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
/* TODO: validate the incoming request */
|
||||
req->current_idx = 1;
|
||||
|
||||
DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
|
||||
req->current_idx, req->in.vector_count));
|
||||
|
||||
status = smbd_smb2_request_setup_out(req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
status = smbd_smb2_request_dispatch(req);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
smbd_server_connection_terminate(conn, nt_errstr(status));
|
||||
return;
|
||||
}
|
||||
|
||||
/* ask for the next request (this constructs the main loop) */
|
||||
subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
|
||||
if (subreq == NULL) {
|
||||
smbd_server_connection_terminate(conn, "no memory for reading");
|
||||
return;
|
||||
}
|
||||
tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user