/* Unix SMB/CIFS implementation. Inter-process communication and named pipe handling Copyright (C) Andrew Tridgell 1992-1998 SMB Version handling Copyright (C) John H Terpstra 1995-1998 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/>. */ /* This file handles the named pipe and mailslot calls in the SMBtrans protocol */ #include "includes.h" extern int max_send; #define NERR_notsupported 50 static void api_no_reply(struct smb_request *req); /******************************************************************* copies parameters and data, as needed, into the smb buffer *both* the data and params sections should be aligned. this is fudged in the rpc pipes by at present, only the data section is. this may be a possible cause of some of the ipc problems being experienced. lkcl26dec97 ******************************************************************/ static void copy_trans_params_and_data(char *outbuf, int align, char *rparam, int param_offset, int param_len, char *rdata, int data_offset, int data_len) { char *copy_into = smb_buf(outbuf); if(param_len < 0) param_len = 0; if(data_len < 0) data_len = 0; DEBUG(5,("copy_trans_params_and_data: params[%d..%d] data[%d..%d] (align %d)\n", param_offset, param_offset + param_len, data_offset , data_offset + data_len, align)); *copy_into = '\0'; copy_into += 1; if (param_len) memcpy(copy_into, &rparam[param_offset], param_len); copy_into += param_len; if (align) { memset(copy_into, '\0', align); } copy_into += align; if (data_len ) memcpy(copy_into, &rdata[data_offset], data_len); } /**************************************************************************** Send a trans reply. ****************************************************************************/ void send_trans_reply(struct smb_request *req, char *rparam, int rparam_len, char *rdata, int rdata_len, bool buffer_too_large) { int this_ldata,this_lparam; int tot_data_sent = 0; int tot_param_sent = 0; int align; int ldata = rdata ? rdata_len : 0; int lparam = rparam ? rparam_len : 0; if (buffer_too_large) DEBUG(5,("send_trans_reply: buffer %d too large\n", ldata )); this_lparam = MIN(lparam,max_send - 500); /* hack */ this_ldata = MIN(ldata,max_send - (500+this_lparam)); align = ((this_lparam)%4); reply_outbuf(req, 10, 1+align+this_ldata+this_lparam); copy_trans_params_and_data((char *)req->outbuf, align, rparam, tot_param_sent, this_lparam, rdata, tot_data_sent, this_ldata); SSVAL(req->outbuf,smb_vwv0,lparam); SSVAL(req->outbuf,smb_vwv1,ldata); SSVAL(req->outbuf,smb_vwv3,this_lparam); SSVAL(req->outbuf,smb_vwv4,smb_offset(smb_buf(req->outbuf)+1, req->outbuf)); SSVAL(req->outbuf,smb_vwv5,0); SSVAL(req->outbuf,smb_vwv6,this_ldata); SSVAL(req->outbuf,smb_vwv7,smb_offset(smb_buf(req->outbuf)+1+ this_lparam+align, req->outbuf)); SSVAL(req->outbuf,smb_vwv8,0); SSVAL(req->outbuf,smb_vwv9,0); if (buffer_too_large) { error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata, STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__); } show_msg((char *)req->outbuf); if (!send_smb(smbd_server_fd(),(char *)req->outbuf)) exit_server_cleanly("send_trans_reply: send_smb failed."); TALLOC_FREE(req->outbuf); tot_data_sent = this_ldata; tot_param_sent = this_lparam; while (tot_data_sent < ldata || tot_param_sent < lparam) { this_lparam = MIN(lparam-tot_param_sent, max_send - 500); /* hack */ this_ldata = MIN(ldata -tot_data_sent, max_send - (500+this_lparam)); if(this_lparam < 0) this_lparam = 0; if(this_ldata < 0) this_ldata = 0; align = (this_lparam%4); reply_outbuf(req, 10, 1+this_ldata+this_lparam+align); copy_trans_params_and_data((char *)req->outbuf, align, rparam, tot_param_sent, this_lparam, rdata, tot_data_sent, this_ldata); SSVAL(req->outbuf,smb_vwv3,this_lparam); SSVAL(req->outbuf,smb_vwv4,smb_offset(smb_buf(req->outbuf)+1, req->outbuf)); SSVAL(req->outbuf,smb_vwv5,tot_param_sent); SSVAL(req->outbuf,smb_vwv6,this_ldata); SSVAL(req->outbuf,smb_vwv7,smb_offset(smb_buf(req->outbuf)+1+ this_lparam+align, req->outbuf)); SSVAL(req->outbuf,smb_vwv8,tot_data_sent); SSVAL(req->outbuf,smb_vwv9,0); if (buffer_too_large) { error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata, STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__); } show_msg((char *)req->outbuf); if (!send_smb(smbd_server_fd(), (char *)req->outbuf)) exit_server_cleanly("send_trans_reply: send_smb failed."); tot_data_sent += this_ldata; tot_param_sent += this_lparam; TALLOC_FREE(req->outbuf); } } /**************************************************************************** Start the first part of an RPC reply which began with an SMBtrans request. ****************************************************************************/ static void api_rpc_trans_reply(struct smb_request *req, smb_np_struct *p) { bool is_data_outstanding; char *rdata = (char *)SMB_MALLOC(p->max_trans_reply); int data_len; if(rdata == NULL) { DEBUG(0,("api_rpc_trans_reply: malloc fail.\n")); reply_nterror(req, NT_STATUS_NO_MEMORY); return; } if((data_len = read_from_pipe( p, rdata, p->max_trans_reply, &is_data_outstanding)) < 0) { SAFE_FREE(rdata); api_no_reply(req); return; } send_trans_reply(req, NULL, 0, rdata, data_len, is_data_outstanding); SAFE_FREE(rdata); return; } /**************************************************************************** WaitNamedPipeHandleState ****************************************************************************/ static void api_WNPHS(struct smb_request *req, smb_np_struct *p, char *param, int param_len) { uint16 priority; if (!param || param_len < 2) { reply_nterror(req, NT_STATUS_INVALID_PARAMETER); return; } priority = SVAL(param,0); DEBUG(4,("WaitNamedPipeHandleState priority %x\n", priority)); if (wait_rpc_pipe_hnd_state(p, priority)) { /* now send the reply */ send_trans_reply(req, NULL, 0, NULL, 0, False); return; } api_no_reply(req); } /**************************************************************************** SetNamedPipeHandleState ****************************************************************************/ static void api_SNPHS(struct smb_request *req, smb_np_struct *p, char *param, int param_len) { uint16 id; if (!param || param_len < 2) { reply_nterror(req, NT_STATUS_INVALID_PARAMETER); return; } id = SVAL(param,0); DEBUG(4,("SetNamedPipeHandleState to code %x\n", id)); if (set_rpc_pipe_hnd_state(p, id)) { /* now send the reply */ send_trans_reply(req, NULL, 0, NULL, 0, False); return; } api_no_reply(req); } /**************************************************************************** When no reply is generated, indicate unsupported. ****************************************************************************/ static void api_no_reply(struct smb_request *req) { char rparam[4]; /* unsupported */ SSVAL(rparam,0,NERR_notsupported); SSVAL(rparam,2,0); /* converter word */ DEBUG(3,("Unsupported API fd command\n")); /* now send the reply */ send_trans_reply(req, rparam, 4, NULL, 0, False); return; } /**************************************************************************** Handle remote api calls delivered to a named pipe already opened. ****************************************************************************/ static void api_fd_reply(connection_struct *conn, uint16 vuid, struct smb_request *req, uint16 *setup, char *data, char *params, int suwcnt, int tdscnt, int tpscnt, int mdrcnt, int mprcnt) { bool reply = False; smb_np_struct *p = NULL; int pnum; int subcommand; DEBUG(5,("api_fd_reply\n")); /* First find out the name of this file. */ if (suwcnt != 2) { DEBUG(0,("Unexpected named pipe transaction.\n")); reply_nterror(req, NT_STATUS_INVALID_PARAMETER); return; } /* Get the file handle and hence the file name. */ /* * NB. The setup array has already been transformed * via SVAL and so is in gost byte order. */ pnum = ((int)setup[1]) & 0xFFFF; subcommand = ((int)setup[0]) & 0xFFFF; if(!(p = get_rpc_pipe(pnum))) { if (subcommand == TRANSACT_WAITNAMEDPIPEHANDLESTATE) { /* Win9x does this call with a unicode pipe name, not a pnum. */ /* Just return success for now... */ DEBUG(3,("Got TRANSACT_WAITNAMEDPIPEHANDLESTATE on text pipe name\n")); send_trans_reply(req, NULL, 0, NULL, 0, False); return; } DEBUG(1,("api_fd_reply: INVALID PIPE HANDLE: %x\n", pnum)); reply_nterror(req, NT_STATUS_INVALID_HANDLE); return; } if (vuid != p->vuid) { DEBUG(1, ("Got pipe request (pnum %x) using invalid VUID %d, " "expected %d\n", pnum, vuid, p->vuid)); reply_nterror(req, NT_STATUS_INVALID_HANDLE); return; } DEBUG(3,("Got API command 0x%x on pipe \"%s\" (pnum %x)\n", subcommand, p->name, pnum)); /* record maximum data length that can be transmitted in an SMBtrans */ p->max_trans_reply = mdrcnt; DEBUG(10,("api_fd_reply: p:%p max_trans_reply: %d\n", p, p->max_trans_reply)); switch (subcommand) { case TRANSACT_DCERPCCMD: /* dce/rpc command */ reply = write_to_pipe(p, data, tdscnt); if (!reply) { api_no_reply(req); return; } api_rpc_trans_reply(req, p); break; case TRANSACT_WAITNAMEDPIPEHANDLESTATE: /* Wait Named Pipe Handle state */ api_WNPHS(req, p, params, tpscnt); break; case TRANSACT_SETNAMEDPIPEHANDLESTATE: /* Set Named Pipe Handle state */ api_SNPHS(req, p, params, tpscnt); break; default: reply_nterror(req, NT_STATUS_INVALID_PARAMETER); return; } } /**************************************************************************** Handle named pipe commands. ****************************************************************************/ static void named_pipe(connection_struct *conn, uint16 vuid, struct smb_request *req, char *name, uint16 *setup, char *data, char *params, int suwcnt, int tdscnt,int tpscnt, int msrcnt, int mdrcnt, int mprcnt) { DEBUG(3,("named pipe command on <%s> name\n", name)); if (strequal(name,"LANMAN")) { api_reply(conn, vuid, req, data, params, tdscnt, tpscnt, mdrcnt, mprcnt); return; } if (strequal(name,"WKSSVC") || strequal(name,"SRVSVC") || strequal(name,"WINREG") || strequal(name,"SAMR") || strequal(name,"LSARPC")) { DEBUG(4,("named pipe command from Win95 (wow!)\n")); api_fd_reply(conn, vuid, req, setup, data, params, suwcnt, tdscnt, tpscnt, mdrcnt, mprcnt); return; } if (strlen(name) < 1) { api_fd_reply(conn, vuid, req, setup, data, params, suwcnt, tdscnt, tpscnt, mdrcnt, mprcnt); return; } if (setup) DEBUG(3,("unknown named pipe: setup 0x%X setup1=%d\n", (int)setup[0],(int)setup[1])); reply_nterror(req, NT_STATUS_NOT_SUPPORTED); return; } static void handle_trans(connection_struct *conn, struct smb_request *req, struct trans_state *state) { char *local_machine_name; int name_offset = 0; DEBUG(3,("trans <%s> data=%u params=%u setup=%u\n", state->name,(unsigned int)state->total_data,(unsigned int)state->total_param, (unsigned int)state->setup_count)); /* * WinCE wierdness.... */ local_machine_name = talloc_asprintf(state, "\\%s\\", get_local_machine_name()); if (local_machine_name == NULL) { reply_nterror(req, NT_STATUS_NO_MEMORY); return; } if (strnequal(state->name, local_machine_name, strlen(local_machine_name))) { name_offset = strlen(local_machine_name)-1; } if (!strnequal(&state->name[name_offset], "\\PIPE", strlen("\\PIPE"))) { reply_nterror(req, NT_STATUS_NOT_SUPPORTED); return; } name_offset += strlen("\\PIPE"); /* Win9x weirdness. When talking to a unicode server Win9x only sends \PIPE instead of \PIPE\ */ if (state->name[name_offset] == '\\') name_offset++; DEBUG(5,("calling named_pipe\n")); named_pipe(conn, state->vuid, req, state->name+name_offset, state->setup,state->data, state->param, state->setup_count,state->total_data, state->total_param, state->max_setup_return, state->max_data_return, state->max_param_return); if (state->close_on_completion) close_cnum(conn,state->vuid); return; } /**************************************************************************** Reply to a SMBtrans. ****************************************************************************/ void reply_trans(connection_struct *conn, struct smb_request *req) { unsigned int dsoff; unsigned int dscnt; unsigned int psoff; unsigned int pscnt; struct trans_state *state; NTSTATUS result; int size; START_PROFILE(SMBtrans); if (req->wct < 14) { reply_nterror(req, NT_STATUS_INVALID_PARAMETER); END_PROFILE(SMBtrans); return; } size = smb_len(req->inbuf) + 4; dsoff = SVAL(req->inbuf, smb_dsoff); dscnt = SVAL(req->inbuf, smb_dscnt); psoff = SVAL(req->inbuf, smb_psoff); pscnt = SVAL(req->inbuf, smb_pscnt); result = allow_new_trans(conn->pending_trans, req->mid); if (!NT_STATUS_IS_OK(result)) { DEBUG(2, ("Got invalid trans request: %s\n", nt_errstr(result))); reply_nterror(req, result); END_PROFILE(SMBtrans); return; } if ((state = TALLOC_P(conn->mem_ctx, struct trans_state)) == NULL) { DEBUG(0, ("talloc failed\n")); reply_nterror(req, NT_STATUS_NO_MEMORY); END_PROFILE(SMBtrans); return; } state->cmd = SMBtrans; state->mid = req->mid; state->vuid = req->vuid; state->setup_count = CVAL(req->inbuf, smb_suwcnt); state->setup = NULL; state->total_param = SVAL(req->inbuf, smb_tpscnt); state->param = NULL; state->total_data = SVAL(req->inbuf, smb_tdscnt); state->data = NULL; state->max_param_return = SVAL(req->inbuf, smb_mprcnt); state->max_data_return = SVAL(req->inbuf, smb_mdrcnt); state->max_setup_return = CVAL(req->inbuf, smb_msrcnt); state->close_on_completion = BITSETW(req->inbuf+smb_vwv5,0); state->one_way = BITSETW(req->inbuf+smb_vwv5,1); memset(state->name, '\0',sizeof(state->name)); srvstr_pull_buf(req->inbuf, req->flags2, state->name, smb_buf(req->inbuf), sizeof(state->name), STR_TERMINATE); if ((dscnt > state->total_data) || (pscnt > state->total_param)) goto bad_param; if (state->total_data) { /* Can't use talloc here, the core routines do realloc on the * params and data. Out of paranoia, 100 bytes too many. */ state->data = (char *)SMB_MALLOC(state->total_data+100); if (state->data == NULL) { DEBUG(0,("reply_trans: data malloc fail for %u " "bytes !\n", (unsigned int)state->total_data)); TALLOC_FREE(state); reply_nterror(req, NT_STATUS_NO_MEMORY); END_PROFILE(SMBtrans); return; } /* null-terminate the slack space */ memset(&state->data[state->total_data], 0, 100); if ((dsoff+dscnt < dsoff) || (dsoff+dscnt < dscnt)) goto bad_param; if ((smb_base(req->inbuf)+dsoff+dscnt > (char *)req->inbuf + size) || (smb_base(req->inbuf)+dsoff+dscnt < smb_base(req->inbuf))) goto bad_param; memcpy(state->data,smb_base(req->inbuf)+dsoff,dscnt); } if (state->total_param) { /* Can't use talloc here, the core routines do realloc on the * params and data. Out of paranoia, 100 bytes too many */ state->param = (char *)SMB_MALLOC(state->total_param+100); if (state->param == NULL) { DEBUG(0,("reply_trans: param malloc fail for %u " "bytes !\n", (unsigned int)state->total_param)); SAFE_FREE(state->data); TALLOC_FREE(state); reply_nterror(req, NT_STATUS_NO_MEMORY); END_PROFILE(SMBtrans); return; } /* null-terminate the slack space */ memset(&state->param[state->total_param], 0, 100); if ((psoff+pscnt < psoff) || (psoff+pscnt < pscnt)) goto bad_param; if ((smb_base(req->inbuf)+psoff+pscnt > (char *)req->inbuf + size) || (smb_base(req->inbuf)+psoff+pscnt < smb_base(req->inbuf))) goto bad_param; memcpy(state->param,smb_base(req->inbuf)+psoff,pscnt); } state->received_data = dscnt; state->received_param = pscnt; if (state->setup_count) { unsigned int i; if((state->setup = TALLOC_ARRAY( state, uint16, state->setup_count)) == NULL) { DEBUG(0,("reply_trans: setup malloc fail for %u " "bytes !\n", (unsigned int) (state->setup_count * sizeof(uint16)))); SAFE_FREE(state->data); SAFE_FREE(state->param); TALLOC_FREE(state); reply_nterror(req, NT_STATUS_NO_MEMORY); END_PROFILE(SMBtrans); return; } if (req->inbuf+smb_vwv14+(state->setup_count*SIZEOFWORD) > req->inbuf + size) goto bad_param; if ((smb_vwv14+(state->setup_count*SIZEOFWORD) < smb_vwv14) || (smb_vwv14+(state->setup_count*SIZEOFWORD) < (state->setup_count*SIZEOFWORD))) goto bad_param; for (i=0;i<state->setup_count;i++) state->setup[i] = SVAL(req->inbuf, smb_vwv14+i*SIZEOFWORD); } state->received_param = pscnt; if ((state->received_param != state->total_param) || (state->received_data != state->total_data)) { DLIST_ADD(conn->pending_trans, state); /* We need to send an interim response then receive the rest of the parameter/data bytes */ reply_outbuf(req, 0, 0); show_msg((char *)req->outbuf); END_PROFILE(SMBtrans); return; } handle_trans(conn, req, state); SAFE_FREE(state->data); SAFE_FREE(state->param); TALLOC_FREE(state); END_PROFILE(SMBtrans); return; bad_param: DEBUG(0,("reply_trans: invalid trans parameters\n")); SAFE_FREE(state->data); SAFE_FREE(state->param); TALLOC_FREE(state); END_PROFILE(SMBtrans); reply_nterror(req, NT_STATUS_INVALID_PARAMETER); return; } /**************************************************************************** Reply to a secondary SMBtrans. ****************************************************************************/ void reply_transs(connection_struct *conn, struct smb_request *req) { unsigned int pcnt,poff,dcnt,doff,pdisp,ddisp; struct trans_state *state; int size; START_PROFILE(SMBtranss); show_msg((char *)req->inbuf); if (req->wct < 8) { reply_nterror(req, NT_STATUS_INVALID_PARAMETER); END_PROFILE(SMBtranss); return; } for (state = conn->pending_trans; state != NULL; state = state->next) { if (state->mid == req->mid) { break; } } if ((state == NULL) || (state->cmd != SMBtrans)) { reply_nterror(req, NT_STATUS_INVALID_PARAMETER); END_PROFILE(SMBtranss); return; } /* Revise total_params and total_data in case they have changed * downwards */ if (SVAL(req->inbuf, smb_vwv0) < state->total_param) state->total_param = SVAL(req->inbuf,smb_vwv0); if (SVAL(req->inbuf, smb_vwv1) < state->total_data) state->total_data = SVAL(req->inbuf,smb_vwv1); size = smb_len(req->inbuf) + 4; pcnt = SVAL(req->inbuf, smb_spscnt); poff = SVAL(req->inbuf, smb_spsoff); pdisp = SVAL(req->inbuf, smb_spsdisp); dcnt = SVAL(req->inbuf, smb_sdscnt); doff = SVAL(req->inbuf, smb_sdsoff); ddisp = SVAL(req->inbuf, smb_sdsdisp); state->received_param += pcnt; state->received_data += dcnt; if ((state->received_data > state->total_data) || (state->received_param > state->total_param)) goto bad_param; if (pcnt) { if (pdisp+pcnt > state->total_param) goto bad_param; if ((pdisp+pcnt < pdisp) || (pdisp+pcnt < pcnt)) goto bad_param; if (pdisp > state->total_param) goto bad_param; if ((smb_base(req->inbuf) + poff + pcnt > (char *)req->inbuf + size) || (smb_base(req->inbuf) + poff + pcnt < smb_base(req->inbuf))) goto bad_param; if (state->param + pdisp < state->param) goto bad_param; memcpy(state->param+pdisp,smb_base(req->inbuf)+poff, pcnt); } if (dcnt) { if (ddisp+dcnt > state->total_data) goto bad_param; if ((ddisp+dcnt < ddisp) || (ddisp+dcnt < dcnt)) goto bad_param; if (ddisp > state->total_data) goto bad_param; if ((smb_base(req->inbuf) + doff + dcnt > (char *)req->inbuf + size) || (smb_base(req->inbuf) + doff + dcnt < smb_base(req->inbuf))) goto bad_param; if (state->data + ddisp < state->data) goto bad_param; memcpy(state->data+ddisp, smb_base(req->inbuf)+doff, dcnt); } if ((state->received_param < state->total_param) || (state->received_data < state->total_data)) { END_PROFILE(SMBtranss); return; } /* construct_reply_common has done us the favor to pre-fill the * command field with SMBtranss which is wrong :-) */ SCVAL(req->outbuf,smb_com,SMBtrans); handle_trans(conn, req, state); DLIST_REMOVE(conn->pending_trans, state); SAFE_FREE(state->data); SAFE_FREE(state->param); TALLOC_FREE(state); END_PROFILE(SMBtranss); return; bad_param: DEBUG(0,("reply_transs: invalid trans parameters\n")); DLIST_REMOVE(conn->pending_trans, state); SAFE_FREE(state->data); SAFE_FREE(state->param); TALLOC_FREE(state); reply_nterror(req, NT_STATUS_INVALID_PARAMETER); END_PROFILE(SMBtranss); return; }