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[Samba/gbeck.git] / source / rpc_server / srv_pipe.c

/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1998
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
 *  Copyright (C) Paul Ashton                  1997-1998.
 *  
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*  this module apparently provides an implementation of DCE/RPC over a
 *  named pipe (IPC$ connection using SMBtrans).  details of DCE/RPC
 *  documentation are available (in on-line form) from the X-Open group.
 *
 *  this module should provide a level of abstraction between SMB
 *  and DCE/RPC, while minimising the amount of mallocs, unnecessary
 *  data copies, and network traffic.
 *
 *  in this version, which takes a "let's learn what's going on and
 *  get something running" approach, there is additional network
 *  traffic generated, but the code should be easier to understand...
 *
 *  ... if you read the docs.  or stare at packets for weeks on end.
 *
 */

#include "includes.h"
#include "nterr.h"

extern int DEBUGLEVEL;

static void NTLMSSPcalc_p( pipes_struct *p, unsigned char *data, int len)
{
    unsigned char *hash = p->ntlmssp_hash;
    unsigned char index_i = hash[256];
    unsigned char index_j = hash[257];
    int ind;

    for( ind = 0; ind < len; ind++)
    {
        unsigned char tc;
        unsigned char t;

        index_i++;
        index_j += hash[index_i];

        tc = hash[index_i];
        hash[index_i] = hash[index_j];
        hash[index_j] = tc;

        t = hash[index_i] + hash[index_j];
        data[ind] = data[ind] ^ hash[t];
    }

    hash[256] = index_i;
    hash[257] = index_j;
}

/*******************************************************************
 turns a DCE/RPC request into a DCE/RPC reply

 this is where the data really should be split up into an array of
 headers and data sections.

 ********************************************************************/
BOOL create_rpc_reply(pipes_struct *p,
                                uint32 data_start, uint32 data_end)
{
        char *data;
        BOOL auth_verify = IS_BITS_SET_ALL(p->ntlmssp_chal.neg_flags, NTLMSSP_NEGOTIATE_SIGN);
        BOOL auth_seal   = IS_BITS_SET_ALL(p->ntlmssp_chal.neg_flags, NTLMSSP_NEGOTIATE_SEAL);
        uint32 data_len;
        uint32 auth_len;

        DEBUG(5,("create_rpc_reply: data_start: %d data_end: %d max_tsize: %d\n",
                  data_start, data_end, p->hdr_ba.bba.max_tsize));

        auth_len = p->hdr.auth_len;

        if (p->ntlmssp_auth)
        {
                DEBUG(10,("create_rpc_reply: auth\n"));
                if (auth_len != 16)
                {
                        return False;
                }
        }

        prs_init(&p->rhdr , 0x18, 4, 0, False);
        prs_init(&p->rauth, 1024, 4, 0, False);
        prs_init(&p->rverf, 0x08, 4, 0, False);

        p->hdr.pkt_type = RPC_RESPONSE; /* mark header as an rpc response */

        /* set up rpc header (fragmentation issues) */
        if (data_start == 0)
        {
                p->hdr.flags = RPC_FLG_FIRST;
        }
        else
        {
                p->hdr.flags = 0;
        }

        p->hdr_resp.alloc_hint = data_end - data_start; /* calculate remaining data to be sent */

        if (p->hdr_resp.alloc_hint + 0x18 <= p->hdr_ba.bba.max_tsize)
        {
                p->hdr.flags |= RPC_FLG_LAST;
                p->hdr.frag_len = p->hdr_resp.alloc_hint + 0x18;
        }
        else
        {
                p->hdr.frag_len = p->hdr_ba.bba.max_tsize;
        }

        if (p->ntlmssp_auth)
        {
                p->hdr_resp.alloc_hint -= auth_len + 8;
        }

        if (p->ntlmssp_auth)
        {
                data_len = p->hdr.frag_len - auth_len - (auth_verify ? 8 : 0) - 0x18;
        }
        else
        {
                data_len = p->hdr.frag_len - 0x18;
        }

        p->rhdr.data->offset.start = 0;
        p->rhdr.data->offset.end   = 0x18;

        /* store the header in the data stream */
        smb_io_rpc_hdr     ("hdr" , &(p->hdr     ), &(p->rhdr), 0);
        smb_io_rpc_hdr_resp("resp", &(p->hdr_resp), &(p->rhdr), 0);

        /* don't use rdata: use rdata_i instead, which moves... */
        /* make a pointer to the rdata data, NOT A COPY */

        p->rdata_i.data = NULL;
        prs_init(&p->rdata_i, 0, p->rdata.align, p->rdata.data->margin, p->rdata.io);
        data = mem_data(&(p->rdata.data), data_start);
        mem_create(p->rdata_i.data, data, 0, data_len, 0, False); 
        p->rdata_i.offset = data_len;

        if (auth_len > 0)
        {
                uint32 crc32 = 0;

                DEBUG(5,("create_rpc_reply: sign: %s seal: %s data %d auth %d\n",
                         BOOLSTR(auth_verify), BOOLSTR(auth_seal), data_len, auth_len));

                if (auth_seal)
                {
                        crc32 = crc32_calc_buffer(data_len, data);
                        NTLMSSPcalc_p(p, (uchar*)data, data_len);
                }

                if (auth_seal || auth_verify)
                {
                        make_rpc_hdr_auth(&p->auth_info, 0x0a, 0x06, 0x08, (auth_verify ? 1 : 0));
                        smb_io_rpc_hdr_auth("hdr_auth", &p->auth_info, &p->rauth, 0);
                }

                if (auth_verify)
                {
                        char *auth_data;
                        p->ntlmssp_seq_num++;
                        make_rpc_auth_ntlmssp_chk(&p->ntlmssp_chk, NTLMSSP_SIGN_VERSION, crc32, p->ntlmssp_seq_num++);
                        smb_io_rpc_auth_ntlmssp_chk("auth_sign", &(p->ntlmssp_chk), &p->rverf, 0);
                        auth_data = mem_data(&p->rverf.data, 4);
                        NTLMSSPcalc_p(p, (uchar*)auth_data, 12);
                }
        }

        /* set up the data chain */
        if (p->ntlmssp_auth)
        {
                prs_link(NULL       , &p->rhdr   , &p->rdata_i);
                prs_link(&p->rhdr   , &p->rdata_i, &p->rauth  );
                prs_link(&p->rdata_i, &p->rauth  , &p->rverf  );
                prs_link(&p->rauth  , &p->rverf  , NULL       );
        }
        else
        {
                prs_link(NULL    , &p->rhdr   , &p->rdata_i);
                prs_link(&p->rhdr, &p->rdata_i, NULL       );
        }

        /* indicate to subsequent data reads where we are up to */
        p->frag_len_left   = p->hdr.frag_len - p->file_offset;
        p->next_frag_start = p->hdr.frag_len; 
        
        return p->rhdr.data != NULL && p->rhdr.offset == 0x18;
}

static BOOL api_pipe_ntlmssp_verify(pipes_struct *p)
{
        uchar lm_owf[24];
        uchar nt_owf[24];
        struct smb_passwd *smb_pass = NULL;
        
        DEBUG(5,("api_pipe_ntlmssp_verify: checking user details\n"));

        if (p->ntlmssp_resp.hdr_lm_resp.str_str_len == 0) return False;
        if (p->ntlmssp_resp.hdr_nt_resp.str_str_len == 0) return False;
        if (p->ntlmssp_resp.hdr_usr    .str_str_len == 0) return False;
        if (p->ntlmssp_resp.hdr_domain .str_str_len == 0) return False;
        if (p->ntlmssp_resp.hdr_wks    .str_str_len == 0) return False;

        memset(p->user_name, 0, sizeof(p->user_name));
        memset(p->domain   , 0, sizeof(p->domain   ));
        memset(p->wks      , 0, sizeof(p->wks      ));

        if (IS_BITS_SET_ALL(p->ntlmssp_chal.neg_flags, NTLMSSP_NEGOTIATE_UNICODE))
        {
                fstrcpy(p->user_name, unistrn2((uint16*)p->ntlmssp_resp.user  , p->ntlmssp_resp.hdr_usr   .str_str_len/2));
                fstrcpy(p->domain   , unistrn2((uint16*)p->ntlmssp_resp.domain, p->ntlmssp_resp.hdr_domain.str_str_len/2));
                fstrcpy(p->wks      , unistrn2((uint16*)p->ntlmssp_resp.wks   , p->ntlmssp_resp.hdr_wks   .str_str_len/2));
        }
        else
        {
                fstrcpy(p->user_name, p->ntlmssp_resp.user  );
                fstrcpy(p->domain   , p->ntlmssp_resp.domain);
                fstrcpy(p->wks      , p->ntlmssp_resp.wks   );
        }

        DEBUG(5,("user: %s domain: %s wks: %s\n", p->user_name, p->domain, p->wks));

        memcpy(lm_owf, p->ntlmssp_resp.lm_resp, sizeof(lm_owf));
        memcpy(nt_owf, p->ntlmssp_resp.nt_resp, sizeof(nt_owf));

#ifdef DEBUG_PASSWORD
        DEBUG(100,("lm, nt owfs, chal\n"));
        dump_data(100, lm_owf, sizeof(lm_owf));
        dump_data(100, nt_owf, sizeof(nt_owf));
        dump_data(100, p->ntlmssp_chal.challenge, 8);
#endif
        become_root(True);
        p->ntlmssp_validated = pass_check_smb(p->user_name, p->domain,
                              (uchar*)p->ntlmssp_chal.challenge,
                              lm_owf, nt_owf, NULL);
        smb_pass = getsmbpwnam(p->user_name);
        unbecome_root(True);

        if (p->ntlmssp_validated && smb_pass != NULL && smb_pass->smb_passwd)
        {
                uchar p24[24];
                NTLMSSPOWFencrypt(smb_pass->smb_passwd, lm_owf, p24);
                {
                        unsigned char j = 0;
                        int ind;

                        unsigned char k2[8];

                        memcpy(k2, p24, 5);
                        k2[5] = 0xe5;
                        k2[6] = 0x38;
                        k2[7] = 0xb0;

                        for (ind = 0; ind < 256; ind++)
                        {
                                p->ntlmssp_hash[ind] = (unsigned char)ind;
                        }

                        for( ind = 0; ind < 256; ind++)
                        {
                                unsigned char tc;

                                j += (p->ntlmssp_hash[ind] + k2[ind%8]);

                                tc = p->ntlmssp_hash[ind];
                                p->ntlmssp_hash[ind] = p->ntlmssp_hash[j];
                                p->ntlmssp_hash[j] = tc;
                        }

                        p->ntlmssp_hash[256] = 0;
                        p->ntlmssp_hash[257] = 0;
                }
/*              NTLMSSPhash(p->ntlmssp_hash, p24); */
                p->ntlmssp_seq_num = 0;
        }
        else
        {
                p->ntlmssp_validated = False;
        }

        return p->ntlmssp_validated;
}

static BOOL api_pipe_ntlmssp(pipes_struct *p, prs_struct *pd)
{
        /* receive a negotiate; send a challenge; receive a response */
        switch (p->auth_verifier.msg_type)
        {
                case NTLMSSP_NEGOTIATE:
                {
                        smb_io_rpc_auth_ntlmssp_neg("", &p->ntlmssp_neg, pd, 0);
                        break;
                }
                case NTLMSSP_AUTH:
                {
                        smb_io_rpc_auth_ntlmssp_resp("", &p->ntlmssp_resp, pd, 0);
                        if (!api_pipe_ntlmssp_verify(p))
                        {
                                pd->offset = 0;
                        }
                        break;
                }
                default:
                {
                        /* NTLMSSP expected: unexpected message type */
                        DEBUG(3,("unexpected message type in NTLMSSP %d\n",
                                  p->auth_verifier.msg_type));
                        return False;
                }
        }

        return (pd->offset != 0);
}

struct api_cmd
{
  char * pipe_clnt_name;
  char * pipe_srv_name;
  BOOL (*fn) (pipes_struct *, prs_struct *);
};

static struct api_cmd api_fd_commands[] =
{
    { "lsarpc",   "lsass",   api_ntlsa_rpc },
    { "samr",     "lsass",   api_samr_rpc },
    { "srvsvc",   "ntsvcs",  api_srvsvc_rpc },
    { "wkssvc",   "ntsvcs",  api_wkssvc_rpc },
    { "NETLOGON", "lsass",   api_netlog_rpc },
    { "winreg",   "winreg",  api_reg_rpc },
    { NULL,       NULL,      NULL }
};

static BOOL api_pipe_bind_auth_resp(pipes_struct *p, prs_struct *pd)
{
        DEBUG(5,("api_pipe_bind_auth_resp: decode request. %d\n", __LINE__));

        if (p->hdr.auth_len == 0) return False;

        /* decode the authentication verifier response */
        smb_io_rpc_hdr_autha("", &p->autha_info, pd, 0);
        if (pd->offset == 0) return False;

        if (!rpc_hdr_auth_chk(&(p->auth_info))) return False;

        smb_io_rpc_auth_verifier("", &p->auth_verifier, pd, 0);
        if (pd->offset == 0) return False;

        if (!rpc_auth_verifier_chk(&(p->auth_verifier), "NTLMSSP", NTLMSSP_AUTH)) return False;
        
        return api_pipe_ntlmssp(p, pd);
}

static BOOL api_pipe_bind_req(pipes_struct *p, prs_struct *pd)
{
        uint16 assoc_gid;
        fstring ack_pipe_name;
        int i = 0;

        p->ntlmssp_auth = False;

        DEBUG(5,("api_pipe_bind_req: decode request. %d\n", __LINE__));

        for (i = 0; api_fd_commands[i].pipe_clnt_name; i++)
        {
                if (strequal(api_fd_commands[i].pipe_clnt_name, p->name) &&
                    api_fd_commands[i].fn != NULL)
                {
                        DEBUG(3,("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
                                   api_fd_commands[i].pipe_clnt_name,
                                   api_fd_commands[i].pipe_srv_name));
                        fstrcpy(p->pipe_srv_name, api_fd_commands[i].pipe_srv_name);
                        break;
                }
        }

        if (api_fd_commands[i].fn == NULL) return False;

        /* decode the bind request */
        smb_io_rpc_hdr_rb("", &p->hdr_rb, pd, 0);

        if (pd->offset == 0) return False;

        if (p->hdr.auth_len != 0)
        {
                /* decode the authentication verifier */
                smb_io_rpc_hdr_auth    ("", &p->auth_info    , pd, 0);
                if (pd->offset == 0) return False;

                p->ntlmssp_auth = p->auth_info.auth_type = 0x0a;

                if (p->ntlmssp_auth)
                {
                        smb_io_rpc_auth_verifier("", &p->auth_verifier, pd, 0);
                        if (pd->offset == 0) return False;

                        p->ntlmssp_auth = strequal(p->auth_verifier.signature, "NTLMSSP");
                }

                if (p->ntlmssp_auth)
                {
                        if (!api_pipe_ntlmssp(p, pd)) return False;
                }
        }

        /* name has to be \PIPE\xxxxx */
        fstrcpy(ack_pipe_name, "\\PIPE\\");
        fstrcat(ack_pipe_name, p->pipe_srv_name);

        DEBUG(5,("api_pipe_bind_req: make response. %d\n", __LINE__));

        prs_init(&(p->rdata), 1024, 4, 0, False);
        prs_init(&(p->rhdr ), 0x18, 4, 0, False);
        prs_init(&(p->rauth), 1024, 4, 0, False);
        prs_init(&(p->rverf), 0x08, 4, 0, False);
        prs_init(&(p->rntlm), 1024, 4, 0, False);

        /***/
        /*** do the bind ack first ***/
        /***/

        if (p->ntlmssp_auth)
        {
                assoc_gid = 0x7a77;
        }
        else
        {
                assoc_gid = p->hdr_rb.bba.assoc_gid;
        }

        make_rpc_hdr_ba(&p->hdr_ba,
                        p->hdr_rb.bba.max_tsize,
                        p->hdr_rb.bba.max_rsize,
                        assoc_gid,
                        ack_pipe_name,
                        0x1, 0x0, 0x0,
                        &(p->hdr_rb.transfer));

        smb_io_rpc_hdr_ba("", &p->hdr_ba, &p->rdata, 0);
        mem_realloc_data(p->rdata.data, p->rdata.offset);

        /***/
        /*** now the authentication ***/
        /***/

        if (p->ntlmssp_auth)
        {
                uint8 challenge[8];
                generate_random_buffer(challenge, 8, False);

                /*** authentication info ***/

                make_rpc_hdr_auth(&p->auth_info, 0x0a, 0x06, 0, 1);
                smb_io_rpc_hdr_auth("", &p->auth_info, &p->rverf, 0);
                mem_realloc_data(p->rverf.data, p->rverf.offset);

                /*** NTLMSSP verifier ***/

                make_rpc_auth_verifier(&p->auth_verifier,
                                       "NTLMSSP", NTLMSSP_CHALLENGE);
                smb_io_rpc_auth_verifier("", &p->auth_verifier, &p->rauth, 0);
                mem_realloc_data(p->rauth.data, p->rauth.offset);

                /* NTLMSSP challenge ***/

                make_rpc_auth_ntlmssp_chal(&p->ntlmssp_chal,
                                           0x000082b1, challenge);
                smb_io_rpc_auth_ntlmssp_chal("", &p->ntlmssp_chal, &p->rntlm, 0);
                mem_realloc_data(p->rntlm.data, p->rntlm.offset);
        }

        /***/
        /*** then do the header, now we know the length ***/
        /***/

        make_rpc_hdr(&p->hdr, RPC_BINDACK, RPC_FLG_FIRST | RPC_FLG_LAST,
                     p->hdr.call_id,
                     p->rdata.offset + p->rverf.offset + p->rauth.offset + p->rntlm.offset + 0x10,
                     p->rauth.offset + p->rntlm.offset);

        smb_io_rpc_hdr("", &p->hdr, &p->rhdr, 0);
        mem_realloc_data(p->rhdr.data, p->rdata.offset);

        /***/
        /*** link rpc header, bind acknowledgment and authentication responses ***/
        /***/

        if (p->ntlmssp_auth)
        {
                prs_link(NULL     , &p->rhdr , &p->rdata);
                prs_link(&p->rhdr , &p->rdata, &p->rverf);
                prs_link(&p->rdata, &p->rverf, &p->rauth);
                prs_link(&p->rverf, &p->rauth, &p->rntlm);
                prs_link(&p->rauth, &p->rntlm, NULL     );
        }
        else
        {
                prs_link(NULL    , &p->rhdr , &p->rdata);
                prs_link(&p->rhdr, &p->rdata, NULL     );
        }

        return True;
}


static BOOL api_pipe_auth_process(pipes_struct *p, prs_struct *pd)
{
        BOOL auth_verify = IS_BITS_SET_ALL(p->ntlmssp_chal.neg_flags, NTLMSSP_NEGOTIATE_SIGN);
        BOOL auth_seal   = IS_BITS_SET_ALL(p->ntlmssp_chal.neg_flags, NTLMSSP_NEGOTIATE_SEAL);
        int data_len;
        int auth_len;
        uint32 old_offset;
        uint32 crc32 = 0;

        auth_len = p->hdr.auth_len;

        if (auth_len != 16 && auth_verify)
        {
                return False;
        }

        data_len = p->hdr.frag_len - auth_len - (auth_verify ? 8 : 0) - 0x18;
        
        DEBUG(5,("api_pipe_auth_process: sign: %s seal: %s data %d auth %d\n",
                 BOOLSTR(auth_verify), BOOLSTR(auth_seal), data_len, auth_len));

        if (auth_seal)
        {
                char *data = mem_data(&pd->data, pd->offset);
                DEBUG(5,("api_pipe_auth_process: data %d\n", pd->offset));
                NTLMSSPcalc_p(p, (uchar*)data, data_len);
                crc32 = crc32_calc_buffer(data_len, data);
        }

        /*** skip the data, record the offset so we can restore it again */
        old_offset = pd->offset;

        if (auth_seal || auth_verify)
        {
                pd->offset += data_len;
                smb_io_rpc_hdr_auth("hdr_auth", &p->auth_info, pd, 0);
        }

        if (auth_verify)
        {
                char *req_data = mem_data(&pd->data, pd->offset + 4);
                DEBUG(5,("api_pipe_auth_process: auth %d\n", pd->offset + 4));
                NTLMSSPcalc_p(p, (uchar*)req_data, 12);
                smb_io_rpc_auth_ntlmssp_chk("auth_sign", &(p->ntlmssp_chk), pd, 0);

                if (!rpc_auth_ntlmssp_chk(&(p->ntlmssp_chk), crc32,
                                          p->ntlmssp_seq_num))
                {
                        return False;
                }
        }

        pd->offset = old_offset;

        return True;
}

static BOOL api_pipe_request(pipes_struct *p, prs_struct *pd)
{
        int i = 0;

        if (p->ntlmssp_auth && p->ntlmssp_validated)
        {
                if (!api_pipe_auth_process(p, pd)) return False;

                DEBUG(0,("api_pipe_request: **** MUST CALL become_user() HERE **** \n"));
#if 0
                become_user();
#endif
        }

        for (i = 0; api_fd_commands[i].pipe_clnt_name; i++)
        {
                if (strequal(api_fd_commands[i].pipe_clnt_name, p->name) &&
                    api_fd_commands[i].fn != NULL)
                {
                        DEBUG(3,("Doing \\PIPE\\%s\n", api_fd_commands[i].pipe_clnt_name));
                        return api_fd_commands[i].fn(p, pd);
                }
        }
        return False;
}

BOOL rpc_command(pipes_struct *p, prs_struct *pd)
{
        BOOL reply = False;
        if (pd->data == NULL) return False;

        /* process the rpc header */
        smb_io_rpc_hdr("", &p->hdr, pd, 0);

        if (pd->offset == 0) return False;

        switch (p->hdr.pkt_type)
        {
                case RPC_BIND   :
                {
                        reply = api_pipe_bind_req(p, pd);
                        break;
                }
                case RPC_REQUEST:
                {
                        if (p->ntlmssp_auth && !p->ntlmssp_validated)
                        {
                                /* authentication _was_ requested
                                   and it failed.  sorry, no deal!
                                 */
                                reply = False;
                        }
                        else
                        {
                                /* read the rpc header */
                                smb_io_rpc_hdr_req("req", &(p->hdr_req), pd, 0);
                                reply = api_pipe_request(p, pd);
                        }
                        break;
                }
                case RPC_BINDRESP: /* not the real name! */
                {
                        reply = api_pipe_bind_auth_resp(p, pd);
                        p->ntlmssp_auth = reply;
                        break;
                }
        }

        if (!reply)
        {
                DEBUG(3,("rpc_command: DCE/RPC fault should be sent here\n"));
        }

        return reply;
}


/*******************************************************************
 receives a netlogon pipe and responds.
 ********************************************************************/
static BOOL api_rpc_command(pipes_struct *p, 
                                char *rpc_name, struct api_struct *api_rpc_cmds,
                                prs_struct *data)
{
        int fn_num;
        DEBUG(4,("api_rpc_command: %s op 0x%x - ", rpc_name, p->hdr_req.opnum));

        for (fn_num = 0; api_rpc_cmds[fn_num].name; fn_num++)
        {
                if (api_rpc_cmds[fn_num].opnum == p->hdr_req.opnum && api_rpc_cmds[fn_num].fn != NULL)
                {
                        DEBUG(3,("api_rpc_command: %s\n", api_rpc_cmds[fn_num].name));
                        break;
                }
        }

        if (api_rpc_cmds[fn_num].name == NULL)
        {
                DEBUG(4, ("unknown\n"));
                return False;
        }

        /* start off with 1024 bytes, and a large safety margin too */
        prs_init(&p->rdata, 1024, 4, SAFETY_MARGIN, False);

        /* do the actual command */
        api_rpc_cmds[fn_num].fn(p->vuid, data, &(p->rdata));

        if (p->rdata.data == NULL || p->rdata.offset == 0)
        {
                mem_free_data(p->rdata.data);
                return False;
        }

        mem_realloc_data(p->rdata.data, p->rdata.offset);

        DEBUG(10,("called %s\n", rpc_name));

        return True;
}


/*******************************************************************
 receives a netlogon pipe and responds.
 ********************************************************************/
BOOL api_rpcTNP(pipes_struct *p, char *rpc_name, struct api_struct *api_rpc_cmds,
                                prs_struct *data)
{
        if (data == NULL || data->data == NULL)
        {
                DEBUG(2,("%s: NULL data received\n", rpc_name));
                return False;
        }

        /* interpret the command */
        if (!api_rpc_command(p, rpc_name, api_rpc_cmds, data))
        {
                return False;
        }

        /* create the rpc header */
        if (!create_rpc_reply(p, 0, p->rdata.offset + (p->ntlmssp_auth ? (16 + 8) : 0)))
        {
                return False;
        }

        return True;
}