samba-mirror/source3/rpc_server/srv_util.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;
extern DOM_SID global_machine_sid;

/*
 * A list of the rids of well known BUILTIN and Domain users
 * and groups.
 */

rid_name builtin_alias_rids[] =
{  
    { BUILTIN_ALIAS_RID_ADMINS       , "Administrators" },
    { BUILTIN_ALIAS_RID_USERS        , "Users" },
    { BUILTIN_ALIAS_RID_GUESTS       , "Guests" },
    { BUILTIN_ALIAS_RID_POWER_USERS  , "Power Users" },
   
    { BUILTIN_ALIAS_RID_ACCOUNT_OPS  , "Account Operators" },
    { BUILTIN_ALIAS_RID_SYSTEM_OPS   , "System Operators" },
    { BUILTIN_ALIAS_RID_PRINT_OPS    , "Print Operators" },
    { BUILTIN_ALIAS_RID_BACKUP_OPS   , "Backup Operators" },
    { BUILTIN_ALIAS_RID_REPLICATOR   , "Replicator" },
    { 0                             , NULL }
};

/* array lookup of well-known Domain RID users. */
rid_name domain_user_rids[] =
{  
    { DOMAIN_USER_RID_ADMIN         , "Administrator" },
    { DOMAIN_USER_RID_GUEST         , "Guest" },
    { 0                             , NULL }
};

/* array lookup of well-known Domain RID groups. */
rid_name domain_group_rids[] =
{  
    { DOMAIN_GROUP_RID_ADMINS       , "Domain Admins" },
    { DOMAIN_GROUP_RID_USERS        , "Domain Users" },
    { DOMAIN_GROUP_RID_GUESTS       , "Domain Guests" },
    { 0                             , NULL }
};

int make_dom_gids(char *gids_str, DOM_GID **ppgids)
{
  char *ptr;
  pstring s2;
  int count;
  DOM_GID *gids;

  *ppgids = NULL;

  DEBUG(4,("make_dom_gids: %s\n", gids_str));

  if (gids_str == NULL || *gids_str == 0)
    return 0;

  for (count = 0, ptr = gids_str; 
       next_token(&ptr, s2, NULL, sizeof(s2)); 
       count++)
    ;

  gids = (DOM_GID *)malloc( sizeof(DOM_GID) * count );
  if(!gids)
  {
    DEBUG(0,("make_dom_gids: malloc fail !\n"));
    return 0;
  }

  for (count = 0, ptr = gids_str; 
       next_token(&ptr, s2, NULL, sizeof(s2)) && 
	       count < LSA_MAX_GROUPS; 
       count++) 
  {
    /* the entries are of the form GID/ATTR, ATTR being optional.*/
    char *attr;
    uint32 rid = 0;
    int i;

    attr = strchr(s2,'/');
    if (attr)
      *attr++ = 0;

    if (!attr || !*attr)
      attr = "7"; /* default value for attribute is 7 */

    /* look up the RID string and see if we can turn it into a rid number */
    for (i = 0; builtin_alias_rids[i].name != NULL; i++)
    {
      if (strequal(builtin_alias_rids[i].name, s2))
      {
        rid = builtin_alias_rids[i].rid;
        break;
      }
    }

    if (rid == 0)
      rid = atoi(s2);

    if (rid == 0)
    {
      DEBUG(1,("make_dom_gids: unknown well-known alias RID %s/%s\n", s2, attr));
      count--;
    }
    else
    {
      gids[count].g_rid = rid;
      gids[count].attr  = atoi(attr);

      DEBUG(5,("group id: %d attr: %d\n", gids[count].g_rid, gids[count].attr));
    }
  }

  *ppgids = gids;
  return count;
}

/*******************************************************************
 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;
	}

	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;

		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->ntlmssp_hash, (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->ntlmssp_hash, (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);
		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;

	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->ntlmssp_hash, (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->ntlmssp_hash, (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;
}


/*******************************************************************
 gets a domain user's groups
 ********************************************************************/
void get_domain_user_groups(char *domain_groups, char *user)
{
	pstring tmp;

	if (domain_groups == NULL || user == NULL) return;

	/* any additional groups this user is in.  e.g power users */
	pstrcpy(domain_groups, lp_domain_groups());

	/* can only be a user or a guest.  cannot be guest _and_ admin */
	if (user_in_list(user, lp_domain_guest_group()))
	{
		slprintf(tmp, sizeof(tmp) - 1, " %ld/7 ", DOMAIN_GROUP_RID_GUESTS);
		pstrcat(domain_groups, tmp);

		DEBUG(3,("domain guest group access %s granted\n", tmp));
	}
	else
	{
		slprintf(tmp, sizeof(tmp) -1, " %ld/7 ", DOMAIN_GROUP_RID_USERS);
		pstrcat(domain_groups, tmp);

		DEBUG(3,("domain group access %s granted\n", tmp));

		if (user_in_list(user, lp_domain_admin_group()))
		{
			slprintf(tmp, sizeof(tmp) - 1, " %ld/7 ", DOMAIN_GROUP_RID_ADMINS);
			pstrcat(domain_groups, tmp);

			DEBUG(3,("domain admin group access %s granted\n", tmp));
		}
	}
}


/*******************************************************************
 lookup_group_name
 ********************************************************************/
uint32 lookup_group_name(uint32 rid, char *group_name, uint32 *type)
{
	int i = 0; 
	(*type) = SID_NAME_DOM_GRP;

	DEBUG(5,("lookup_group_name: rid: %d", rid));

	while (domain_group_rids[i].rid != rid && domain_group_rids[i].rid != 0)
	{
		i++;
	}

	if (domain_group_rids[i].rid != 0)
	{
		fstrcpy(group_name, domain_group_rids[i].name);
		DEBUG(5,(" = %s\n", group_name));
		return 0x0;
	}

	DEBUG(5,(" none mapped\n"));
	return 0xC0000000 | NT_STATUS_NONE_MAPPED;
}

/*******************************************************************
 lookup_alias_name
 ********************************************************************/
uint32 lookup_alias_name(uint32 rid, char *alias_name, uint32 *type)
{
	int i = 0; 
	(*type) = SID_NAME_WKN_GRP;

	DEBUG(5,("lookup_alias_name: rid: %d", rid));

	while (builtin_alias_rids[i].rid != rid && builtin_alias_rids[i].rid != 0)
	{
		i++;
	}

	if (builtin_alias_rids[i].rid != 0)
	{
		fstrcpy(alias_name, builtin_alias_rids[i].name);
		DEBUG(5,(" = %s\n", alias_name));
		return 0x0;
	}

	DEBUG(5,(" none mapped\n"));
	return 0xC0000000 | NT_STATUS_NONE_MAPPED;
}

/*******************************************************************
 lookup_user_name
 ********************************************************************/
uint32 lookup_user_name(uint32 rid, char *user_name, uint32 *type)
{
	struct sam_disp_info *disp_info;
	int i = 0;
	(*type) = SID_NAME_USER;

	DEBUG(5,("lookup_user_name: rid: %d", rid));

	/* look up the well-known domain user rids first */
	while (domain_user_rids[i].rid != rid && domain_user_rids[i].rid != 0)
	{
		i++;
	}

	if (domain_user_rids[i].rid != 0)
	{
		fstrcpy(user_name, domain_user_rids[i].name);
		DEBUG(5,(" = %s\n", user_name));
		return 0x0;
	}

	/* ok, it's a user.  find the user account */
	become_root(True);
	disp_info = getsamdisprid(rid);
	unbecome_root(True);

	if (disp_info != NULL)
	{
		fstrcpy(user_name, disp_info->smb_name);
		DEBUG(5,(" = %s\n", user_name));
		return 0x0;
	}

	DEBUG(5,(" none mapped\n"));
	return 0xC0000000 | NT_STATUS_NONE_MAPPED;
}

/*******************************************************************
 lookup_group_rid
 ********************************************************************/
uint32 lookup_group_rid(char *group_name, uint32 *rid)
{
	char *grp_name;
	int i = -1; /* start do loop at -1 */

	do /* find, if it exists, a group rid for the group name*/
	{
		i++;
		(*rid) = domain_group_rids[i].rid;
		grp_name = domain_group_rids[i].name;

	} while (grp_name != NULL && !strequal(grp_name, group_name));

	return (grp_name != NULL) ? 0 : 0xC0000000 | NT_STATUS_NONE_MAPPED;
}

/*******************************************************************
 lookup_alias_rid
 ********************************************************************/
uint32 lookup_alias_rid(char *alias_name, uint32 *rid)
{
	char *als_name;
	int i = -1; /* start do loop at -1 */

	do /* find, if it exists, a alias rid for the alias name*/
	{
		i++;
		(*rid) = builtin_alias_rids[i].rid;
		als_name = builtin_alias_rids[i].name;

	} while (als_name != NULL && !strequal(als_name, alias_name));

	return (als_name != NULL) ? 0 : 0xC0000000 | NT_STATUS_NONE_MAPPED;
}

/*******************************************************************
 lookup_user_rid
 ********************************************************************/
uint32 lookup_user_rid(char *user_name, uint32 *rid)
{
	struct sam_passwd *sam_pass;
	(*rid) = 0;

	/* find the user account */
	become_root(True);
	sam_pass = getsam21pwnam(user_name);
	unbecome_root(True);

	if (sam_pass != NULL)
	{
		(*rid) = sam_pass->user_rid;
		return 0x0;
	}

	return 0xC0000000 | NT_STATUS_NONE_MAPPED;
}