diff options
Diffstat (limited to 'source4/librpc/rpc/dcerpc_smb2.c')
| -rw-r--r-- | source4/librpc/rpc/dcerpc_smb2.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/source4/librpc/rpc/dcerpc_smb2.c b/source4/librpc/rpc/dcerpc_smb2.c new file mode 100644 index 0000000000..84ba8114e2 --- /dev/null +++ b/source4/librpc/rpc/dcerpc_smb2.c @@ -0,0 +1,512 @@ +/* + Unix SMB/CIFS implementation. + + dcerpc over SMB2 transport + + Copyright (C) Andrew Tridgell 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "libcli/raw/libcliraw.h" +#include "libcli/composite/composite.h" +#include "libcli/smb2/smb2.h" +#include "libcli/smb2/smb2_calls.h" +#include "libcli/raw/ioctl.h" +#include "librpc/rpc/dcerpc.h" +#include "librpc/rpc/dcerpc_proto.h" + +/* transport private information used by SMB2 pipe transport */ +struct smb2_private { + struct smb2_handle handle; + struct smb2_tree *tree; + const char *server_name; + bool dead; +}; + + +/* + tell the dcerpc layer that the transport is dead +*/ +static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status) +{ + struct smb2_private *smb = (struct smb2_private *)c->transport.private_data; + + if (smb->dead) { + return; + } + + smb->dead = true; + + if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) { + status = NT_STATUS_UNEXPECTED_NETWORK_ERROR; + } + + if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) { + status = NT_STATUS_END_OF_FILE; + } + + if (c->transport.recv_data) { + c->transport.recv_data(c, NULL, status); + } +} + + +/* + this holds the state of an in-flight call +*/ +struct smb2_read_state { + struct dcerpc_connection *c; + DATA_BLOB data; +}; + +/* + called when a read request has completed +*/ +static void smb2_read_callback(struct smb2_request *req) +{ + struct smb2_private *smb; + struct smb2_read_state *state; + struct smb2_read io; + uint16_t frag_length; + NTSTATUS status; + + state = talloc_get_type(req->async.private_data, struct smb2_read_state); + smb = talloc_get_type(state->c->transport.private_data, struct smb2_private); + + status = smb2_read_recv(req, state, &io); + if (NT_STATUS_IS_ERR(status)) { + pipe_dead(state->c, status); + talloc_free(state); + return; + } + + if (!data_blob_append(state, &state->data, + io.out.data.data, io.out.data.length)) { + pipe_dead(state->c, NT_STATUS_NO_MEMORY); + talloc_free(state); + return; + } + + if (state->data.length < 16) { + DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n", + (int)state->data.length)); + pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH); + talloc_free(state); + return; + } + + frag_length = dcerpc_get_frag_length(&state->data); + + if (frag_length <= state->data.length) { + DATA_BLOB data = state->data; + struct dcerpc_connection *c = state->c; + talloc_steal(c, data.data); + talloc_free(state); + c->transport.recv_data(c, &data, NT_STATUS_OK); + return; + } + + /* initiate another read request, as we only got part of a fragment */ + ZERO_STRUCT(io); + io.in.file.handle = smb->handle; + io.in.length = MIN(state->c->srv_max_xmit_frag, + frag_length - state->data.length); + if (io.in.length < 16) { + io.in.length = 16; + } + + req = smb2_read_send(smb->tree, &io); + if (req == NULL) { + pipe_dead(state->c, NT_STATUS_NO_MEMORY); + talloc_free(state); + return; + } + + req->async.fn = smb2_read_callback; + req->async.private_data = state; +} + + +/* + trigger a read request from the server, possibly with some initial + data in the read buffer +*/ +static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob) +{ + struct smb2_private *smb = (struct smb2_private *)c->transport.private_data; + struct smb2_read io; + struct smb2_read_state *state; + struct smb2_request *req; + + state = talloc(smb, struct smb2_read_state); + if (state == NULL) { + return NT_STATUS_NO_MEMORY; + } + + state->c = c; + if (blob == NULL) { + state->data = data_blob(NULL, 0); + } else { + state->data = *blob; + talloc_steal(state, state->data.data); + } + + ZERO_STRUCT(io); + io.in.file.handle = smb->handle; + + if (state->data.length >= 16) { + uint16_t frag_length = dcerpc_get_frag_length(&state->data); + io.in.length = frag_length - state->data.length; + } else { + io.in.length = 0x2000; + } + + req = smb2_read_send(smb->tree, &io); + if (req == NULL) { + return NT_STATUS_NO_MEMORY; + } + + req->async.fn = smb2_read_callback; + req->async.private_data = state; + + return NT_STATUS_OK; +} + + +/* + trigger a read request from the server +*/ +static NTSTATUS send_read_request(struct dcerpc_connection *c) +{ + struct smb2_private *smb = (struct smb2_private *)c->transport.private_data; + + if (smb->dead) { + return NT_STATUS_CONNECTION_DISCONNECTED; + } + + return send_read_request_continue(c, NULL); +} + +/* + this holds the state of an in-flight trans call +*/ +struct smb2_trans_state { + struct dcerpc_connection *c; +}; + +/* + called when a trans request has completed +*/ +static void smb2_trans_callback(struct smb2_request *req) +{ + struct smb2_trans_state *state = talloc_get_type(req->async.private_data, + struct smb2_trans_state); + struct dcerpc_connection *c = state->c; + NTSTATUS status; + struct smb2_ioctl io; + + status = smb2_ioctl_recv(req, state, &io); + if (NT_STATUS_IS_ERR(status)) { + pipe_dead(c, status); + return; + } + + if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) { + DATA_BLOB data = io.out.out; + talloc_steal(c, data.data); + talloc_free(state); + c->transport.recv_data(c, &data, NT_STATUS_OK); + return; + } + + /* there is more to receive - setup a read */ + send_read_request_continue(c, &io.out.out); + talloc_free(state); +} + +/* + send a SMBtrans style request, using a named pipe read_write fsctl +*/ +static NTSTATUS smb2_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob) +{ + struct smb2_private *smb = talloc_get_type(c->transport.private_data, + struct smb2_private); + struct smb2_ioctl io; + struct smb2_trans_state *state; + struct smb2_request *req; + + state = talloc(smb, struct smb2_trans_state); + if (state == NULL) { + return NT_STATUS_NO_MEMORY; + } + + state->c = c; + + ZERO_STRUCT(io); + io.in.file.handle = smb->handle; + io.in.function = FSCTL_NAMED_PIPE_READ_WRITE; + io.in.max_response_size = 0x1000; + io.in.flags = 1; + io.in.out = *blob; + + req = smb2_ioctl_send(smb->tree, &io); + if (req == NULL) { + talloc_free(state); + return NT_STATUS_NO_MEMORY; + } + + req->async.fn = smb2_trans_callback; + req->async.private_data = state; + + talloc_steal(state, req); + + return NT_STATUS_OK; +} + +/* + called when a write request has completed +*/ +static void smb2_write_callback(struct smb2_request *req) +{ + struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private_data; + + if (!NT_STATUS_IS_OK(req->status)) { + DEBUG(0,("dcerpc_smb2: write callback error\n")); + pipe_dead(c, req->status); + } + + smb2_request_destroy(req); +} + +/* + send a packet to the server +*/ +static NTSTATUS smb2_send_request(struct dcerpc_connection *c, DATA_BLOB *blob, + bool trigger_read) +{ + struct smb2_private *smb = (struct smb2_private *)c->transport.private_data; + struct smb2_write io; + struct smb2_request *req; + + if (smb->dead) { + return NT_STATUS_CONNECTION_DISCONNECTED; + } + + if (trigger_read) { + return smb2_send_trans_request(c, blob); + } + + ZERO_STRUCT(io); + io.in.file.handle = smb->handle; + io.in.data = *blob; + + req = smb2_write_send(smb->tree, &io); + if (req == NULL) { + return NT_STATUS_NO_MEMORY; + } + + req->async.fn = smb2_write_callback; + req->async.private_data = c; + + return NT_STATUS_OK; +} + +/* + shutdown SMB pipe connection +*/ +static NTSTATUS smb2_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status) +{ + struct smb2_private *smb = (struct smb2_private *)c->transport.private_data; + struct smb2_close io; + struct smb2_request *req; + + /* maybe we're still starting up */ + if (!smb) return status; + + ZERO_STRUCT(io); + io.in.file.handle = smb->handle; + req = smb2_close_send(smb->tree, &io); + if (req != NULL) { + /* we don't care if this fails, so just free it if it succeeds */ + req->async.fn = (void (*)(struct smb2_request *))talloc_free; + } + + talloc_free(smb); + + return status; +} + +/* + return SMB server name +*/ +static const char *smb2_peer_name(struct dcerpc_connection *c) +{ + struct smb2_private *smb = talloc_get_type(c->transport.private_data, + struct smb2_private); + return smb->server_name; +} + +/* + return remote name we make the actual connection (good for kerberos) +*/ +static const char *smb2_target_hostname(struct dcerpc_connection *c) +{ + struct smb2_private *smb = talloc_get_type(c->transport.private_data, + struct smb2_private); + return smb->tree->session->transport->socket->hostname; +} + +/* + fetch the user session key +*/ +static NTSTATUS smb2_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key) +{ + struct smb2_private *smb = talloc_get_type(c->transport.private_data, + struct smb2_private); + *session_key = smb->tree->session->session_key; + if (session_key->data == NULL) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + return NT_STATUS_OK; +} + +struct pipe_open_smb2_state { + struct dcerpc_connection *c; + struct composite_context *ctx; +}; + +static void pipe_open_recv(struct smb2_request *req); + +struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p, + struct smb2_tree *tree, + const char *pipe_name) +{ + struct composite_context *ctx; + struct pipe_open_smb2_state *state; + struct smb2_create io; + struct smb2_request *req; + struct dcerpc_connection *c = p->conn; + + ctx = composite_create(c, c->event_ctx); + if (ctx == NULL) return NULL; + + state = talloc(ctx, struct pipe_open_smb2_state); + if (composite_nomem(state, ctx)) return ctx; + ctx->private_data = state; + + state->c = c; + state->ctx = ctx; + + ZERO_STRUCT(io); + io.in.desired_access = + SEC_STD_READ_CONTROL | + SEC_FILE_READ_ATTRIBUTE | + SEC_FILE_WRITE_ATTRIBUTE | + SEC_STD_SYNCHRONIZE | + SEC_FILE_READ_EA | + SEC_FILE_WRITE_EA | + SEC_FILE_READ_DATA | + SEC_FILE_WRITE_DATA | + SEC_FILE_APPEND_DATA; + io.in.share_access = + NTCREATEX_SHARE_ACCESS_READ | + NTCREATEX_SHARE_ACCESS_WRITE; + io.in.create_disposition = NTCREATEX_DISP_OPEN; + io.in.create_options = + NTCREATEX_OPTIONS_NON_DIRECTORY_FILE | + NTCREATEX_OPTIONS_NO_RECALL; + io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION; + + if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) || + (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) { + pipe_name += 6; + } + io.in.fname = pipe_name; + + req = smb2_create_send(tree, &io); + composite_continue_smb2(ctx, req, pipe_open_recv, state); + return ctx; +} + +static void pipe_open_recv(struct smb2_request *req) +{ + struct pipe_open_smb2_state *state = + talloc_get_type(req->async.private_data, + struct pipe_open_smb2_state); + struct composite_context *ctx = state->ctx; + struct dcerpc_connection *c = state->c; + struct smb2_tree *tree = req->tree; + struct smb2_private *smb; + struct smb2_create io; + + ctx->status = smb2_create_recv(req, state, &io); + if (!composite_is_ok(ctx)) return; + + /* + fill in the transport methods + */ + c->transport.transport = NCACN_NP; + c->transport.private_data = NULL; + c->transport.shutdown_pipe = smb2_shutdown_pipe; + c->transport.peer_name = smb2_peer_name; + c->transport.target_hostname = smb2_target_hostname; + + c->transport.send_request = smb2_send_request; + c->transport.send_read = send_read_request; + c->transport.recv_data = NULL; + + /* Over-ride the default session key with the SMB session key */ + c->security_state.session_key = smb2_session_key; + + smb = talloc(c, struct smb2_private); + if (composite_nomem(smb, ctx)) return; + + smb->handle = io.out.file.handle; + smb->tree = talloc_reference(smb, tree); + smb->server_name= strupper_talloc(smb, + tree->session->transport->socket->hostname); + if (composite_nomem(smb->server_name, ctx)) return; + smb->dead = false; + + c->transport.private_data = smb; + + composite_done(ctx); +} + +NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c) +{ + NTSTATUS status = composite_wait(c); + talloc_free(c); + return status; +} + +NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p, + struct smb2_tree *tree, + const char *pipe_name) +{ + struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name); + return dcerpc_pipe_open_smb2_recv(ctx); +} + +/* + return the SMB2 tree used for a dcerpc over SMB2 pipe +*/ +struct smb2_tree *dcerpc_smb2_tree(struct dcerpc_connection *c) +{ + struct smb2_private *smb = talloc_get_type(c->transport.private_data, + struct smb2_private); + return smb->tree; +} |