/* Unix SMB/CIFS implementation. client transaction calls Copyright (C) Andrew Tridgell 1994-1998 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/>. */ #include "includes.h" /**************************************************************************** Send a SMB trans or trans2 request. ****************************************************************************/ bool cli_send_trans(struct cli_state *cli, int trans, const char *pipe_name, int fid, int flags, uint16 *setup, unsigned int lsetup, unsigned int msetup, const char *param, unsigned int lparam, unsigned int mparam, const char *data, unsigned int ldata, unsigned int mdata) { unsigned int i; unsigned int this_ldata,this_lparam; unsigned int tot_data=0,tot_param=0; char *outdata,*outparam; char *p; int pipe_name_len=0; uint16 mid; this_lparam = MIN(lparam,cli->max_xmit - (500+lsetup*2)); /* hack */ this_ldata = MIN(ldata,cli->max_xmit - (500+lsetup*2+this_lparam)); memset(cli->outbuf,'\0',smb_size); cli_set_message(cli->outbuf,14+lsetup,0,True); SCVAL(cli->outbuf,smb_com,trans); SSVAL(cli->outbuf,smb_tid, cli->cnum); cli_setup_packet(cli); /* * Save the mid we're using. We need this for finding * signing replies. */ mid = cli->mid; if (pipe_name) { pipe_name_len = clistr_push(cli, smb_buf(cli->outbuf), pipe_name, -1, STR_TERMINATE); } outparam = smb_buf(cli->outbuf)+(trans==SMBtrans ? pipe_name_len : 3); outdata = outparam+this_lparam; /* primary request */ SSVAL(cli->outbuf,smb_tpscnt,lparam); /* tpscnt */ SSVAL(cli->outbuf,smb_tdscnt,ldata); /* tdscnt */ SSVAL(cli->outbuf,smb_mprcnt,mparam); /* mprcnt */ SSVAL(cli->outbuf,smb_mdrcnt,mdata); /* mdrcnt */ SCVAL(cli->outbuf,smb_msrcnt,msetup); /* msrcnt */ SSVAL(cli->outbuf,smb_flags,flags); /* flags */ SIVAL(cli->outbuf,smb_timeout,0); /* timeout */ SSVAL(cli->outbuf,smb_pscnt,this_lparam); /* pscnt */ SSVAL(cli->outbuf,smb_psoff,smb_offset(outparam,cli->outbuf)); /* psoff */ SSVAL(cli->outbuf,smb_dscnt,this_ldata); /* dscnt */ SSVAL(cli->outbuf,smb_dsoff,smb_offset(outdata,cli->outbuf)); /* dsoff */ SCVAL(cli->outbuf,smb_suwcnt,lsetup); /* suwcnt */ for (i=0;i<lsetup;i++) /* setup[] */ SSVAL(cli->outbuf,smb_setup+i*2,setup[i]); p = smb_buf(cli->outbuf); if (trans != SMBtrans) { *p++ = 0; /* put in a null smb_name */ *p++ = 'D'; *p++ = ' '; /* observed in OS/2 */ } if (this_lparam) /* param[] */ memcpy(outparam,param,this_lparam); if (this_ldata) /* data[] */ memcpy(outdata,data,this_ldata); cli_setup_bcc(cli, outdata+this_ldata); show_msg(cli->outbuf); if (!cli_send_smb(cli)) { return False; } if (this_ldata < ldata || this_lparam < lparam) { /* receive interim response */ if (!cli_receive_smb(cli) || cli_is_error(cli)) { return(False); } tot_data = this_ldata; tot_param = this_lparam; while (tot_data < ldata || tot_param < lparam) { this_lparam = MIN(lparam-tot_param,cli->max_xmit - 500); /* hack */ this_ldata = MIN(ldata-tot_data,cli->max_xmit - (500+this_lparam)); cli_set_message(cli->outbuf,trans==SMBtrans?8:9,0,True); SCVAL(cli->outbuf,smb_com,(trans==SMBtrans ? SMBtranss : SMBtranss2)); outparam = smb_buf(cli->outbuf); outdata = outparam+this_lparam; /* secondary request */ SSVAL(cli->outbuf,smb_tpscnt,lparam); /* tpscnt */ SSVAL(cli->outbuf,smb_tdscnt,ldata); /* tdscnt */ SSVAL(cli->outbuf,smb_spscnt,this_lparam); /* pscnt */ SSVAL(cli->outbuf,smb_spsoff,smb_offset(outparam,cli->outbuf)); /* psoff */ SSVAL(cli->outbuf,smb_spsdisp,tot_param); /* psdisp */ SSVAL(cli->outbuf,smb_sdscnt,this_ldata); /* dscnt */ SSVAL(cli->outbuf,smb_sdsoff,smb_offset(outdata,cli->outbuf)); /* dsoff */ SSVAL(cli->outbuf,smb_sdsdisp,tot_data); /* dsdisp */ if (trans==SMBtrans2) SSVALS(cli->outbuf,smb_sfid,fid); /* fid */ if (this_lparam) /* param[] */ memcpy(outparam,param+tot_param,this_lparam); if (this_ldata) /* data[] */ memcpy(outdata,data+tot_data,this_ldata); cli_setup_bcc(cli, outdata+this_ldata); /* * Save the mid we're using. We need this for finding * signing replies. */ mid = cli->mid; show_msg(cli->outbuf); if (!cli_send_smb(cli)) { return False; } /* Ensure we use the same mid for the secondaries. */ cli->mid = mid; tot_data += this_ldata; tot_param += this_lparam; } } return(True); } /**************************************************************************** Receive a SMB trans or trans2 response allocating the necessary memory. ****************************************************************************/ bool cli_receive_trans(struct cli_state *cli,int trans, char **param, unsigned int *param_len, char **data, unsigned int *data_len) { unsigned int total_data=0; unsigned int total_param=0; unsigned int this_data,this_param; NTSTATUS status; bool ret = False; *data_len = *param_len = 0; if (!cli_receive_smb(cli)) { return False; } show_msg(cli->inbuf); /* sanity check */ if (CVAL(cli->inbuf,smb_com) != trans) { DEBUG(0,("Expected %s response, got command 0x%02x\n", trans==SMBtrans?"SMBtrans":"SMBtrans2", CVAL(cli->inbuf,smb_com))); return False; } /* * An NT RPC pipe call can return ERRDOS, ERRmoredata * to a trans call. This is not an error and should not * be treated as such. Note that STATUS_NO_MORE_FILES is * returned when a trans2 findfirst/next finishes. * When setting up an encrypted transport we can also * see NT_STATUS_MORE_PROCESSING_REQUIRED here. * * Vista returns NT_STATUS_INACCESSIBLE_SYSTEM_SHORTCUT if the folder * "<share>/Users/All Users" is enumerated. This is a special pseudo * folder, and the response does not have parameters (nor a parameter * length). */ status = cli_nt_error(cli); if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { if (NT_STATUS_IS_ERR(status) || NT_STATUS_EQUAL(status,STATUS_NO_MORE_FILES) || NT_STATUS_EQUAL(status,NT_STATUS_INACCESSIBLE_SYSTEM_SHORTCUT)) { goto out; } } /* parse out the lengths */ total_data = SVAL(cli->inbuf,smb_tdrcnt); total_param = SVAL(cli->inbuf,smb_tprcnt); /* allocate it */ if (total_data!=0) { /* We know adding 2 is safe as total_data is an * SVAL <= 0xFFFF. */ *data = (char *)SMB_REALLOC(*data,total_data+2); if (!(*data)) { DEBUG(0,("cli_receive_trans: failed to enlarge data buffer\n")); goto out; } } if (total_param!=0) { /* We know adding 2 is safe as total_param is an * SVAL <= 0xFFFF. */ *param = (char *)SMB_REALLOC(*param,total_param+2); if (!(*param)) { DEBUG(0,("cli_receive_trans: failed to enlarge param buffer\n")); goto out; } } for (;;) { this_data = SVAL(cli->inbuf,smb_drcnt); this_param = SVAL(cli->inbuf,smb_prcnt); if (this_data + *data_len > total_data || this_param + *param_len > total_param) { DEBUG(1,("Data overflow in cli_receive_trans\n")); goto out; } if (this_data + *data_len < this_data || this_data + *data_len < *data_len || this_param + *param_len < this_param || this_param + *param_len < *param_len) { DEBUG(1,("Data overflow in cli_receive_trans\n")); goto out; } if (this_data) { unsigned int data_offset_out = SVAL(cli->inbuf,smb_drdisp); unsigned int data_offset_in = SVAL(cli->inbuf,smb_droff); if (data_offset_out > total_data || data_offset_out + this_data > total_data || data_offset_out + this_data < data_offset_out || data_offset_out + this_data < this_data) { DEBUG(1,("Data overflow in cli_receive_trans\n")); goto out; } if (data_offset_in > cli->bufsize || data_offset_in + this_data > cli->bufsize || data_offset_in + this_data < data_offset_in || data_offset_in + this_data < this_data) { DEBUG(1,("Data overflow in cli_receive_trans\n")); goto out; } memcpy(*data + data_offset_out, smb_base(cli->inbuf) + data_offset_in, this_data); } if (this_param) { unsigned int param_offset_out = SVAL(cli->inbuf,smb_prdisp); unsigned int param_offset_in = SVAL(cli->inbuf,smb_proff); if (param_offset_out > total_param || param_offset_out + this_param > total_param || param_offset_out + this_param < param_offset_out || param_offset_out + this_param < this_param) { DEBUG(1,("Param overflow in cli_receive_trans\n")); goto out; } if (param_offset_in > cli->bufsize || param_offset_in + this_param > cli->bufsize || param_offset_in + this_param < param_offset_in || param_offset_in + this_param < this_param) { DEBUG(1,("Param overflow in cli_receive_trans\n")); goto out; } memcpy(*param + param_offset_out, smb_base(cli->inbuf) + param_offset_in, this_param); } *data_len += this_data; *param_len += this_param; if (total_data <= *data_len && total_param <= *param_len) { ret = True; break; } if (!cli_receive_smb(cli)) { goto out; } show_msg(cli->inbuf); /* sanity check */ if (CVAL(cli->inbuf,smb_com) != trans) { DEBUG(0,("Expected %s response, got command 0x%02x\n", trans==SMBtrans?"SMBtrans":"SMBtrans2", CVAL(cli->inbuf,smb_com))); goto out; } if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { if (NT_STATUS_IS_ERR(cli_nt_error(cli))) { goto out; } } /* parse out the total lengths again - they can shrink! */ if (SVAL(cli->inbuf,smb_tdrcnt) < total_data) total_data = SVAL(cli->inbuf,smb_tdrcnt); if (SVAL(cli->inbuf,smb_tprcnt) < total_param) total_param = SVAL(cli->inbuf,smb_tprcnt); if (total_data <= *data_len && total_param <= *param_len) { ret = True; break; } } out: if (ret) { /* Ensure the last 2 bytes of param and data are 2 null * bytes. These are malloc'ed, but not included in any * length counts. This allows cli_XX string reading functions * to safely null terminate. */ if (total_data) { SSVAL(*data,total_data,0); } if (total_param) { SSVAL(*param,total_param,0); } } return ret; } /**************************************************************************** Send a SMB nttrans request. ****************************************************************************/ bool cli_send_nt_trans(struct cli_state *cli, int function, int flags, uint16 *setup, unsigned int lsetup, unsigned int msetup, char *param, unsigned int lparam, unsigned int mparam, char *data, unsigned int ldata, unsigned int mdata) { unsigned int i; unsigned int this_ldata,this_lparam; unsigned int tot_data=0,tot_param=0; uint16 mid; char *outdata,*outparam; this_lparam = MIN(lparam,cli->max_xmit - (500+lsetup*2)); /* hack */ this_ldata = MIN(ldata,cli->max_xmit - (500+lsetup*2+this_lparam)); memset(cli->outbuf,'\0',smb_size); cli_set_message(cli->outbuf,19+lsetup,0,True); SCVAL(cli->outbuf,smb_com,SMBnttrans); SSVAL(cli->outbuf,smb_tid, cli->cnum); cli_setup_packet(cli); /* * Save the mid we're using. We need this for finding * signing replies. */ mid = cli->mid; outparam = smb_buf(cli->outbuf)+3; outdata = outparam+this_lparam; /* primary request */ SCVAL(cli->outbuf,smb_nt_MaxSetupCount,msetup); SCVAL(cli->outbuf,smb_nt_Flags,flags); SIVAL(cli->outbuf,smb_nt_TotalParameterCount, lparam); SIVAL(cli->outbuf,smb_nt_TotalDataCount, ldata); SIVAL(cli->outbuf,smb_nt_MaxParameterCount, mparam); SIVAL(cli->outbuf,smb_nt_MaxDataCount, mdata); SIVAL(cli->outbuf,smb_nt_ParameterCount, this_lparam); SIVAL(cli->outbuf,smb_nt_ParameterOffset, smb_offset(outparam,cli->outbuf)); SIVAL(cli->outbuf,smb_nt_DataCount, this_ldata); SIVAL(cli->outbuf,smb_nt_DataOffset, smb_offset(outdata,cli->outbuf)); SIVAL(cli->outbuf,smb_nt_SetupCount, lsetup); SIVAL(cli->outbuf,smb_nt_Function, function); for (i=0;i<lsetup;i++) /* setup[] */ SSVAL(cli->outbuf,smb_nt_SetupStart+i*2,setup[i]); if (this_lparam) /* param[] */ memcpy(outparam,param,this_lparam); if (this_ldata) /* data[] */ memcpy(outdata,data,this_ldata); cli_setup_bcc(cli, outdata+this_ldata); show_msg(cli->outbuf); if (!cli_send_smb(cli)) { return False; } if (this_ldata < ldata || this_lparam < lparam) { /* receive interim response */ if (!cli_receive_smb(cli) || cli_is_error(cli)) { return(False); } tot_data = this_ldata; tot_param = this_lparam; while (tot_data < ldata || tot_param < lparam) { this_lparam = MIN(lparam-tot_param,cli->max_xmit - 500); /* hack */ this_ldata = MIN(ldata-tot_data,cli->max_xmit - (500+this_lparam)); cli_set_message(cli->outbuf,18,0,True); SCVAL(cli->outbuf,smb_com,SMBnttranss); /* XXX - these should probably be aligned */ outparam = smb_buf(cli->outbuf); outdata = outparam+this_lparam; /* secondary request */ SIVAL(cli->outbuf,smb_nts_TotalParameterCount,lparam); SIVAL(cli->outbuf,smb_nts_TotalDataCount,ldata); SIVAL(cli->outbuf,smb_nts_ParameterCount,this_lparam); SIVAL(cli->outbuf,smb_nts_ParameterOffset,smb_offset(outparam,cli->outbuf)); SIVAL(cli->outbuf,smb_nts_ParameterDisplacement,tot_param); SIVAL(cli->outbuf,smb_nts_DataCount,this_ldata); SIVAL(cli->outbuf,smb_nts_DataOffset,smb_offset(outdata,cli->outbuf)); SIVAL(cli->outbuf,smb_nts_DataDisplacement,tot_data); if (this_lparam) /* param[] */ memcpy(outparam,param+tot_param,this_lparam); if (this_ldata) /* data[] */ memcpy(outdata,data+tot_data,this_ldata); cli_setup_bcc(cli, outdata+this_ldata); /* * Save the mid we're using. We need this for finding * signing replies. */ mid = cli->mid; show_msg(cli->outbuf); if (!cli_send_smb(cli)) { return False; } /* Ensure we use the same mid for the secondaries. */ cli->mid = mid; tot_data += this_ldata; tot_param += this_lparam; } } return(True); } /**************************************************************************** Receive a SMB nttrans response allocating the necessary memory. ****************************************************************************/ bool cli_receive_nt_trans(struct cli_state *cli, char **param, unsigned int *param_len, char **data, unsigned int *data_len) { unsigned int total_data=0; unsigned int total_param=0; unsigned int this_data,this_param; uint8 eclass; uint32 ecode; bool ret = False; *data_len = *param_len = 0; if (!cli_receive_smb(cli)) { return False; } show_msg(cli->inbuf); /* sanity check */ if (CVAL(cli->inbuf,smb_com) != SMBnttrans) { DEBUG(0,("Expected SMBnttrans response, got command 0x%02x\n", CVAL(cli->inbuf,smb_com))); return(False); } /* * An NT RPC pipe call can return ERRDOS, ERRmoredata * to a trans call. This is not an error and should not * be treated as such. */ if (cli_is_dos_error(cli)) { cli_dos_error(cli, &eclass, &ecode); if (!(eclass == ERRDOS && ecode == ERRmoredata)) { goto out; } } /* * Likewise for NT_STATUS_BUFFER_TOO_SMALL */ if (cli_is_nt_error(cli)) { if (!NT_STATUS_EQUAL(cli_nt_error(cli), NT_STATUS_BUFFER_TOO_SMALL)) { goto out; } } /* parse out the lengths */ total_data = IVAL(cli->inbuf,smb_ntr_TotalDataCount); total_param = IVAL(cli->inbuf,smb_ntr_TotalParameterCount); /* Only allow 16 megs. */ if (total_param > 16*1024*1024) { DEBUG(0,("cli_receive_nt_trans: param buffer too large %d\n", total_param)); goto out; } if (total_data > 16*1024*1024) { DEBUG(0,("cli_receive_nt_trans: data buffer too large %d\n", total_data)); goto out; } /* allocate it */ if (total_data) { /* We know adding 2 is safe as total_data is less * than 16mb (above). */ *data = (char *)SMB_REALLOC(*data,total_data+2); if (!(*data)) { DEBUG(0,("cli_receive_nt_trans: failed to enlarge data buffer to %d\n",total_data)); goto out; } } if (total_param) { /* We know adding 2 is safe as total_param is less * than 16mb (above). */ *param = (char *)SMB_REALLOC(*param,total_param+2); if (!(*param)) { DEBUG(0,("cli_receive_nt_trans: failed to enlarge param buffer to %d\n", total_param)); goto out; } } while (1) { this_data = SVAL(cli->inbuf,smb_ntr_DataCount); this_param = SVAL(cli->inbuf,smb_ntr_ParameterCount); if (this_data + *data_len > total_data || this_param + *param_len > total_param) { DEBUG(1,("Data overflow in cli_receive_nt_trans\n")); goto out; } if (this_data + *data_len < this_data || this_data + *data_len < *data_len || this_param + *param_len < this_param || this_param + *param_len < *param_len) { DEBUG(1,("Data overflow in cli_receive_nt_trans\n")); goto out; } if (this_data) { unsigned int data_offset_out = SVAL(cli->inbuf,smb_ntr_DataDisplacement); unsigned int data_offset_in = SVAL(cli->inbuf,smb_ntr_DataOffset); if (data_offset_out > total_data || data_offset_out + this_data > total_data || data_offset_out + this_data < data_offset_out || data_offset_out + this_data < this_data) { DEBUG(1,("Data overflow in cli_receive_nt_trans\n")); goto out; } if (data_offset_in > cli->bufsize || data_offset_in + this_data > cli->bufsize || data_offset_in + this_data < data_offset_in || data_offset_in + this_data < this_data) { DEBUG(1,("Data overflow in cli_receive_nt_trans\n")); goto out; } memcpy(*data + data_offset_out, smb_base(cli->inbuf) + data_offset_in, this_data); } if (this_param) { unsigned int param_offset_out = SVAL(cli->inbuf,smb_ntr_ParameterDisplacement); unsigned int param_offset_in = SVAL(cli->inbuf,smb_ntr_ParameterOffset); if (param_offset_out > total_param || param_offset_out + this_param > total_param || param_offset_out + this_param < param_offset_out || param_offset_out + this_param < this_param) { DEBUG(1,("Param overflow in cli_receive_nt_trans\n")); goto out; } if (param_offset_in > cli->bufsize || param_offset_in + this_param > cli->bufsize || param_offset_in + this_param < param_offset_in || param_offset_in + this_param < this_param) { DEBUG(1,("Param overflow in cli_receive_nt_trans\n")); goto out; } memcpy(*param + param_offset_out, smb_base(cli->inbuf) + param_offset_in, this_param); } *data_len += this_data; *param_len += this_param; if (total_data <= *data_len && total_param <= *param_len) { ret = True; break; } if (!cli_receive_smb(cli)) { goto out; } show_msg(cli->inbuf); /* sanity check */ if (CVAL(cli->inbuf,smb_com) != SMBnttrans) { DEBUG(0,("Expected SMBnttrans response, got command 0x%02x\n", CVAL(cli->inbuf,smb_com))); goto out; } if (cli_is_dos_error(cli)) { cli_dos_error(cli, &eclass, &ecode); if(!(eclass == ERRDOS && ecode == ERRmoredata)) { goto out; } } /* * Likewise for NT_STATUS_BUFFER_TOO_SMALL */ if (cli_is_nt_error(cli)) { if (!NT_STATUS_EQUAL(cli_nt_error(cli), NT_STATUS_BUFFER_TOO_SMALL)) { goto out; } } /* parse out the total lengths again - they can shrink! */ if (IVAL(cli->inbuf,smb_ntr_TotalDataCount) < total_data) total_data = IVAL(cli->inbuf,smb_ntr_TotalDataCount); if (IVAL(cli->inbuf,smb_ntr_TotalParameterCount) < total_param) total_param = IVAL(cli->inbuf,smb_ntr_TotalParameterCount); if (total_data <= *data_len && total_param <= *param_len) { ret = True; break; } } out: if (ret) { /* Ensure the last 2 bytes of param and data are 2 null * bytes. These are malloc'ed, but not included in any * length counts. This allows cli_XX string reading functions * to safely null terminate. */ if (total_data) { SSVAL(*data,total_data,0); } if (total_param) { SSVAL(*param,total_param,0); } } return ret; }