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srv_pipe.c

/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *  Almost completely rewritten by (C) Jeremy Allison 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/>.
 */

/*  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.
 *
 */

#include "includes.h"

extern struct pipe_id_info pipe_names[];
extern struct current_user current_user;

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

static void free_pipe_ntlmssp_auth_data(struct pipe_auth_data *auth)
{
      AUTH_NTLMSSP_STATE *a = auth->a_u.auth_ntlmssp_state;

      if (a) {
            auth_ntlmssp_end(&a);
      }
      auth->a_u.auth_ntlmssp_state = NULL;
}

static DATA_BLOB generic_session_key(void)
{
      return data_blob("SystemLibraryDTC", 16);
}

/*******************************************************************
 Generate the next PDU to be returned from the data in p->rdata. 
 Handle NTLMSSP.
 ********************************************************************/

static bool create_next_pdu_ntlmssp(pipes_struct *p)
{
      RPC_HDR_RESP hdr_resp;
      uint32 ss_padding_len = 0;
      uint32 data_space_available;
      uint32 data_len_left;
      uint32 data_len;
      prs_struct outgoing_pdu;
      NTSTATUS status;
      DATA_BLOB auth_blob;
      RPC_HDR_AUTH auth_info;
      uint8 auth_type, auth_level;
      AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;

      /*
       * If we're in the fault state, keep returning fault PDU's until
       * the pipe gets closed. JRA.
       */

      if(p->fault_state) {
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
            return True;
      }

      memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));

      /* Change the incoming request header to a response. */
      p->hdr.pkt_type = RPC_RESPONSE;

      /* Set up rpc header flags. */
      if (p->out_data.data_sent_length == 0) {
            p->hdr.flags = RPC_FLG_FIRST;
      } else {
            p->hdr.flags = 0;
      }

      /*
       * Work out how much we can fit in a single PDU.
       */

      data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;

      /*
       * Ensure there really is data left to send.
       */

      if(!data_len_left) {
            DEBUG(0,("create_next_pdu_ntlmssp: no data left to send !\n"));
            return False;
      }

      data_space_available = sizeof(p->out_data.current_pdu) - RPC_HEADER_LEN - RPC_HDR_RESP_LEN -
                              RPC_HDR_AUTH_LEN - NTLMSSP_SIG_SIZE;

      /*
       * The amount we send is the minimum of the available
       * space and the amount left to send.
       */

      data_len = MIN(data_len_left, data_space_available);

      /*
       * Set up the alloc hint. This should be the data left to
       * send.
       */

      hdr_resp.alloc_hint = data_len_left;

      /*
       * Work out if this PDU will be the last.
       */

      if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
            p->hdr.flags |= RPC_FLG_LAST;
            if (data_len_left % 8) {
                  ss_padding_len = 8 - (data_len_left % 8);
                  DEBUG(10,("create_next_pdu_ntlmssp: adding sign/seal padding of %u\n",
                        ss_padding_len ));
            }
      }

      /*
       * Set up the header lengths.
       */

      p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN +
                  data_len + ss_padding_len +
                  RPC_HDR_AUTH_LEN + NTLMSSP_SIG_SIZE;
      p->hdr.auth_len = NTLMSSP_SIG_SIZE;


      /*
       * Init the parse struct to point at the outgoing
       * data.
       */

      prs_init( &outgoing_pdu, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /* Store the header in the data stream. */
      if(!smb_io_rpc_hdr("hdr", &p->hdr, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_RESP.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Copy the data into the PDU. */

      if(!prs_append_some_prs_data(&outgoing_pdu, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) {
            DEBUG(0,("create_next_pdu_ntlmssp: failed to copy %u bytes of data.\n", (unsigned int)data_len));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Copy the sign/seal padding data. */
      if (ss_padding_len) {
            char pad[8];

            memset(pad, '\0', 8);
            if (!prs_copy_data_in(&outgoing_pdu, pad, ss_padding_len)) {
                  DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes of pad data.\n",
                              (unsigned int)ss_padding_len));
                  prs_mem_free(&outgoing_pdu);
                  return False;
            }
      }


      /* Now write out the auth header and null blob. */
      if (p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) {
            auth_type = RPC_NTLMSSP_AUTH_TYPE;
      } else {
            auth_type = RPC_SPNEGO_AUTH_TYPE;
      }
      if (p->auth.auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
            auth_level = RPC_AUTH_LEVEL_PRIVACY;
      } else {
            auth_level = RPC_AUTH_LEVEL_INTEGRITY;
      }

      init_rpc_hdr_auth(&auth_info, auth_type, auth_level, ss_padding_len, 1 /* context id. */);
      if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_AUTH.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Generate the sign blob. */

      switch (p->auth.auth_level) {
            case PIPE_AUTH_LEVEL_PRIVACY:
                  /* Data portion is encrypted. */
                  status = ntlmssp_seal_packet(a->ntlmssp_state,
                                          (unsigned char *)prs_data_p(&outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
                                          data_len + ss_padding_len,
                                          (unsigned char *)prs_data_p(&outgoing_pdu),
                                          (size_t)prs_offset(&outgoing_pdu),
                                          &auth_blob);
                  if (!NT_STATUS_IS_OK(status)) {
                        data_blob_free(&auth_blob);
                        prs_mem_free(&outgoing_pdu);
                        return False;
                  }
                  break;
            case PIPE_AUTH_LEVEL_INTEGRITY:
                  /* Data is signed. */
                  status = ntlmssp_sign_packet(a->ntlmssp_state,
                                          (unsigned char *)prs_data_p(&outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
                                          data_len + ss_padding_len,
                                          (unsigned char *)prs_data_p(&outgoing_pdu),
                                          (size_t)prs_offset(&outgoing_pdu),
                                          &auth_blob);
                  if (!NT_STATUS_IS_OK(status)) {
                        data_blob_free(&auth_blob);
                        prs_mem_free(&outgoing_pdu);
                        return False;
                  }
                  break;
            default:
                  prs_mem_free(&outgoing_pdu);
                  return False;
      }

      /* Append the auth blob. */
      if (!prs_copy_data_in(&outgoing_pdu, (char *)auth_blob.data, NTLMSSP_SIG_SIZE)) {
            DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes auth blob.\n",
                        (unsigned int)NTLMSSP_SIG_SIZE));
            data_blob_free(&auth_blob);
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      data_blob_free(&auth_blob);

      /*
       * Setup the counts for this PDU.
       */

      p->out_data.data_sent_length += data_len;
      p->out_data.current_pdu_len = p->hdr.frag_len;
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&outgoing_pdu);
      return True;
}

/*******************************************************************
 Generate the next PDU to be returned from the data in p->rdata. 
 Return an schannel authenticated fragment.
 ********************************************************************/

static bool create_next_pdu_schannel(pipes_struct *p)
{
      RPC_HDR_RESP hdr_resp;
      uint32 ss_padding_len = 0;
      uint32 data_len;
      uint32 data_space_available;
      uint32 data_len_left;
      prs_struct outgoing_pdu;
      uint32 data_pos;

      /*
       * If we're in the fault state, keep returning fault PDU's until
       * the pipe gets closed. JRA.
       */

      if(p->fault_state) {
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
            return True;
      }

      memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));

      /* Change the incoming request header to a response. */
      p->hdr.pkt_type = RPC_RESPONSE;

      /* Set up rpc header flags. */
      if (p->out_data.data_sent_length == 0) {
            p->hdr.flags = RPC_FLG_FIRST;
      } else {
            p->hdr.flags = 0;
      }

      /*
       * Work out how much we can fit in a single PDU.
       */

      data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;

      /*
       * Ensure there really is data left to send.
       */

      if(!data_len_left) {
            DEBUG(0,("create_next_pdu_schannel: no data left to send !\n"));
            return False;
      }

      data_space_available = sizeof(p->out_data.current_pdu) - RPC_HEADER_LEN - RPC_HDR_RESP_LEN -
                              RPC_HDR_AUTH_LEN - RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;

      /*
       * The amount we send is the minimum of the available
       * space and the amount left to send.
       */

      data_len = MIN(data_len_left, data_space_available);

      /*
       * Set up the alloc hint. This should be the data left to
       * send.
       */

      hdr_resp.alloc_hint = data_len_left;

      /*
       * Work out if this PDU will be the last.
       */

      if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
            p->hdr.flags |= RPC_FLG_LAST;
            if (data_len_left % 8) {
                  ss_padding_len = 8 - (data_len_left % 8);
                  DEBUG(10,("create_next_pdu_schannel: adding sign/seal padding of %u\n",
                        ss_padding_len ));
            }
      }

      p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len + ss_padding_len +
                        RPC_HDR_AUTH_LEN + RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
      p->hdr.auth_len = RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;

      /*
       * Init the parse struct to point at the outgoing
       * data.
       */

      prs_init( &outgoing_pdu, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /* Store the header in the data stream. */
      if(!smb_io_rpc_hdr("hdr", &p->hdr, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_RESP.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Store the current offset. */
      data_pos = prs_offset(&outgoing_pdu);

      /* Copy the data into the PDU. */

      if(!prs_append_some_prs_data(&outgoing_pdu, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) {
            DEBUG(0,("create_next_pdu_schannel: failed to copy %u bytes of data.\n", (unsigned int)data_len));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Copy the sign/seal padding data. */
      if (ss_padding_len) {
            char pad[8];
            memset(pad, '\0', 8);
            if (!prs_copy_data_in(&outgoing_pdu, pad, ss_padding_len)) {
                  DEBUG(0,("create_next_pdu_schannel: failed to add %u bytes of pad data.\n", (unsigned int)ss_padding_len));
                  prs_mem_free(&outgoing_pdu);
                  return False;
            }
      }

      {
            /*
             * Schannel processing.
             */
            char *data;
            RPC_HDR_AUTH auth_info;
            RPC_AUTH_SCHANNEL_CHK verf;

            data = prs_data_p(&outgoing_pdu) + data_pos;
            /* Check it's the type of reply we were expecting to decode */

            init_rpc_hdr_auth(&auth_info,
                        RPC_SCHANNEL_AUTH_TYPE,
                        p->auth.auth_level == PIPE_AUTH_LEVEL_PRIVACY ?
                              RPC_AUTH_LEVEL_PRIVACY : RPC_AUTH_LEVEL_INTEGRITY,
                        ss_padding_len, 1);

            if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, &outgoing_pdu, 0)) {
                  DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_AUTH.\n"));
                  prs_mem_free(&outgoing_pdu);
                  return False;
            }

            schannel_encode(p->auth.a_u.schannel_auth, 
                        p->auth.auth_level,
                        SENDER_IS_ACCEPTOR,
                        &verf, data, data_len + ss_padding_len);

            if (!smb_io_rpc_auth_schannel_chk("", RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN, 
                        &verf, &outgoing_pdu, 0)) {
                  prs_mem_free(&outgoing_pdu);
                  return False;
            }

            p->auth.a_u.schannel_auth->seq_num++;
      }

      /*
       * Setup the counts for this PDU.
       */

      p->out_data.data_sent_length += data_len;
      p->out_data.current_pdu_len = p->hdr.frag_len;
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&outgoing_pdu);
      return True;
}

/*******************************************************************
 Generate the next PDU to be returned from the data in p->rdata. 
 No authentication done.
********************************************************************/

static bool create_next_pdu_noauth(pipes_struct *p)
{
      RPC_HDR_RESP hdr_resp;
      uint32 data_len;
      uint32 data_space_available;
      uint32 data_len_left;
      prs_struct outgoing_pdu;

      /*
       * If we're in the fault state, keep returning fault PDU's until
       * the pipe gets closed. JRA.
       */

      if(p->fault_state) {
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
            return True;
      }

      memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));

      /* Change the incoming request header to a response. */
      p->hdr.pkt_type = RPC_RESPONSE;

      /* Set up rpc header flags. */
      if (p->out_data.data_sent_length == 0) {
            p->hdr.flags = RPC_FLG_FIRST;
      } else {
            p->hdr.flags = 0;
      }

      /*
       * Work out how much we can fit in a single PDU.
       */

      data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;

      /*
       * Ensure there really is data left to send.
       */

      if(!data_len_left) {
            DEBUG(0,("create_next_pdu_noath: no data left to send !\n"));
            return False;
      }

      data_space_available = sizeof(p->out_data.current_pdu) - RPC_HEADER_LEN - RPC_HDR_RESP_LEN;

      /*
       * The amount we send is the minimum of the available
       * space and the amount left to send.
       */

      data_len = MIN(data_len_left, data_space_available);

      /*
       * Set up the alloc hint. This should be the data left to
       * send.
       */

      hdr_resp.alloc_hint = data_len_left;

      /*
       * Work out if this PDU will be the last.
       */

      if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
            p->hdr.flags |= RPC_FLG_LAST;
      }

      /*
       * Set up the header lengths.
       */

      p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len;
      p->hdr.auth_len = 0;

      /*
       * Init the parse struct to point at the outgoing
       * data.
       */

      prs_init( &outgoing_pdu, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /* Store the header in the data stream. */
      if(!smb_io_rpc_hdr("hdr", &p->hdr, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_noath: failed to marshall RPC_HDR.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &outgoing_pdu, 0)) {
            DEBUG(0,("create_next_pdu_noath: failed to marshall RPC_HDR_RESP.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /* Copy the data into the PDU. */

      if(!prs_append_some_prs_data(&outgoing_pdu, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) {
            DEBUG(0,("create_next_pdu_noauth: failed to copy %u bytes of data.\n", (unsigned int)data_len));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      /*
       * Setup the counts for this PDU.
       */

      p->out_data.data_sent_length += data_len;
      p->out_data.current_pdu_len = p->hdr.frag_len;
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&outgoing_pdu);
      return True;
}

/*******************************************************************
 Generate the next PDU to be returned from the data in p->rdata. 
********************************************************************/

bool create_next_pdu(pipes_struct *p)
{
      switch(p->auth.auth_level) {
            case PIPE_AUTH_LEVEL_NONE:
            case PIPE_AUTH_LEVEL_CONNECT:
                  /* This is incorrect for auth level connect. Fixme. JRA */
                  return create_next_pdu_noauth(p);
            
            default:
                  switch(p->auth.auth_type) {
                        case PIPE_AUTH_TYPE_NTLMSSP:
                        case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
                              return create_next_pdu_ntlmssp(p);
                        case PIPE_AUTH_TYPE_SCHANNEL:
                              return create_next_pdu_schannel(p);
                        default:
                              break;
                  }
      }

      DEBUG(0,("create_next_pdu: invalid internal auth level %u / type %u",
                  (unsigned int)p->auth.auth_level,
                  (unsigned int)p->auth.auth_type));
      return False;
}

/*******************************************************************
 Process an NTLMSSP authentication response.
 If this function succeeds, the user has been authenticated
 and their domain, name and calling workstation stored in
 the pipe struct.
*******************************************************************/

static bool pipe_ntlmssp_verify_final(pipes_struct *p, DATA_BLOB *p_resp_blob)
{
      DATA_BLOB reply;
      NTSTATUS status;
      AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;

      DEBUG(5,("pipe_ntlmssp_verify_final: pipe %s checking user details\n", p->name));

      ZERO_STRUCT(reply);

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

      /* Set up for non-authenticated user. */
      TALLOC_FREE(p->pipe_user.nt_user_token);
      p->pipe_user.ut.ngroups = 0;
      SAFE_FREE( p->pipe_user.ut.groups);

      /* this has to be done as root in order to verify the password */
      become_root();
      status = auth_ntlmssp_update(a, *p_resp_blob, &reply);
      unbecome_root();

      /* Don't generate a reply. */
      data_blob_free(&reply);

      if (!NT_STATUS_IS_OK(status)) {
            return False;
      }

      /* Finally - if the pipe negotiated integrity (sign) or privacy (seal)
         ensure the underlying NTLMSSP flags are also set. If not we should
         refuse the bind. */

      if (p->auth.auth_level == PIPE_AUTH_LEVEL_INTEGRITY) {
            if (!(a->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
                  DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet integrity requested "
                        "but client declined signing.\n",
                              p->name ));
                  return False;
            }
      }
      if (p->auth.auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
            if (!(a->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
                  DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet privacy requested "
                        "but client declined sealing.\n",
                              p->name ));
                  return False;
            }
      }
      
      fstrcpy(p->user_name, a->ntlmssp_state->user);
      fstrcpy(p->pipe_user_name, a->server_info->unix_name);
      fstrcpy(p->domain, a->ntlmssp_state->domain);
      fstrcpy(p->wks, a->ntlmssp_state->workstation);

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

      /*
       * Store the UNIX credential data (uid/gid pair) in the pipe structure.
       */

      p->pipe_user.ut.uid = a->server_info->uid;
      p->pipe_user.ut.gid = a->server_info->gid;
      
      /*
       * We're an authenticated bind over smbd, so the session key needs to
       * be set to "SystemLibraryDTC". Weird, but this is what Windows
       * does. See the RPC-SAMBA3SESSIONKEY.
       */

      data_blob_free(&p->session_key);
      p->session_key = generic_session_key();
      if (!p->session_key.data) {
            return False;
      }

      p->pipe_user.ut.ngroups = a->server_info->n_groups;
      if (p->pipe_user.ut.ngroups) {
            if (!(p->pipe_user.ut.groups = (gid_t *)memdup(a->server_info->groups,
                                    sizeof(gid_t) * p->pipe_user.ut.ngroups))) {
                  DEBUG(0,("failed to memdup group list to p->pipe_user.groups\n"));
                  return False;
            }
      }

      if (a->server_info->ptok) {
            p->pipe_user.nt_user_token =
                  dup_nt_token(NULL, a->server_info->ptok);
      } else {
            DEBUG(1,("Error: Authmodule failed to provide nt_user_token\n"));
            p->pipe_user.nt_user_token = NULL;
            return False;
      }

      return True;
}

/*******************************************************************
 The switch table for the pipe names and the functions to handle them.
*******************************************************************/

struct rpc_table {
      struct {
            const char *clnt;
            const char *srv;
      } pipe;
      const struct api_struct *cmds;
      int n_cmds;
};

static struct rpc_table *rpc_lookup;
static int rpc_lookup_size;

/*******************************************************************
 This is the "stage3" NTLMSSP response after a bind request and reply.
*******************************************************************/

bool api_pipe_bind_auth3(pipes_struct *p, prs_struct *rpc_in_p)
{
      RPC_HDR_AUTH auth_info;
      uint32 pad;
      DATA_BLOB blob;

      ZERO_STRUCT(blob);

      DEBUG(5,("api_pipe_bind_auth3: decode request. %d\n", __LINE__));

      if (p->hdr.auth_len == 0) {
            DEBUG(0,("api_pipe_bind_auth3: No auth field sent !\n"));
            goto err;
      }

      /* 4 bytes padding. */
      if (!prs_uint32("pad", rpc_in_p, 0, &pad)) {
            DEBUG(0,("api_pipe_bind_auth3: unmarshall of 4 byte pad failed.\n"));
            goto err;
      }

      /*
       * Decode the authentication verifier response.
       */

      if(!smb_io_rpc_hdr_auth("", &auth_info, rpc_in_p, 0)) {
            DEBUG(0,("api_pipe_bind_auth3: unmarshall of RPC_HDR_AUTH failed.\n"));
            goto err;
      }

      if (auth_info.auth_type != RPC_NTLMSSP_AUTH_TYPE) {
            DEBUG(0,("api_pipe_bind_auth3: incorrect auth type (%u).\n",
                  (unsigned int)auth_info.auth_type ));
            return False;
      }

      blob = data_blob(NULL,p->hdr.auth_len);

      if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
            DEBUG(0,("api_pipe_bind_auth3: Failed to pull %u bytes - the response blob.\n",
                  (unsigned int)p->hdr.auth_len ));
            goto err;
      }

      /*
       * The following call actually checks the challenge/response data.
       * for correctness against the given DOMAIN\user name.
       */
      
      if (!pipe_ntlmssp_verify_final(p, &blob)) {
            goto err;
      }

      data_blob_free(&blob);

      p->pipe_bound = True;

      return True;

 err:

      data_blob_free(&blob);
      free_pipe_ntlmssp_auth_data(&p->auth);
      p->auth.a_u.auth_ntlmssp_state = NULL;

      return False;
}

/*******************************************************************
 Marshall a bind_nak pdu.
*******************************************************************/

static bool setup_bind_nak(pipes_struct *p)
{
      prs_struct outgoing_rpc;
      RPC_HDR nak_hdr;
      uint16 zero = 0;

      /* Free any memory in the current return data buffer. */
      prs_mem_free(&p->out_data.rdata);

      /*
       * Marshall directly into the outgoing PDU space. We
       * must do this as we need to set to the bind response
       * header and are never sending more than one PDU here.
       */

      prs_init( &outgoing_rpc, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_rpc, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /*
       * Initialize a bind_nak header.
       */

      init_rpc_hdr(&nak_hdr, RPC_BINDNACK, RPC_FLG_FIRST | RPC_FLG_LAST,
            p->hdr.call_id, RPC_HEADER_LEN + sizeof(uint16), 0);

      /*
       * Marshall the header into the outgoing PDU.
       */

      if(!smb_io_rpc_hdr("", &nak_hdr, &outgoing_rpc, 0)) {
            DEBUG(0,("setup_bind_nak: marshalling of RPC_HDR failed.\n"));
            prs_mem_free(&outgoing_rpc);
            return False;
      }

      /*
       * Now add the reject reason.
       */

      if(!prs_uint16("reject code", &outgoing_rpc, 0, &zero)) {
            prs_mem_free(&outgoing_rpc);
            return False;
      }

      p->out_data.data_sent_length = 0;
      p->out_data.current_pdu_len = prs_offset(&outgoing_rpc);
      p->out_data.current_pdu_sent = 0;

      if (p->auth.auth_data_free_func) {
            (*p->auth.auth_data_free_func)(&p->auth);
      }
      p->auth.auth_level = PIPE_AUTH_LEVEL_NONE;
      p->auth.auth_type = PIPE_AUTH_TYPE_NONE;
      p->pipe_bound = False;

      return True;
}

/*******************************************************************
 Marshall a fault pdu.
*******************************************************************/

bool setup_fault_pdu(pipes_struct *p, NTSTATUS status)
{
      prs_struct outgoing_pdu;
      RPC_HDR fault_hdr;
      RPC_HDR_RESP hdr_resp;
      RPC_HDR_FAULT fault_resp;

      /* Free any memory in the current return data buffer. */
      prs_mem_free(&p->out_data.rdata);

      /*
       * Marshall directly into the outgoing PDU space. We
       * must do this as we need to set to the bind response
       * header and are never sending more than one PDU here.
       */

      prs_init( &outgoing_pdu, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /*
       * Initialize a fault header.
       */

      init_rpc_hdr(&fault_hdr, RPC_FAULT, RPC_FLG_FIRST | RPC_FLG_LAST | RPC_FLG_NOCALL,
            p->hdr.call_id, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + RPC_HDR_FAULT_LEN, 0);

      /*
       * Initialize the HDR_RESP and FAULT parts of the PDU.
       */

      memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));

      fault_resp.status = status;
      fault_resp.reserved = 0;

      /*
       * Marshall the header into the outgoing PDU.
       */

      if(!smb_io_rpc_hdr("", &fault_hdr, &outgoing_pdu, 0)) {
            DEBUG(0,("setup_fault_pdu: marshalling of RPC_HDR failed.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &outgoing_pdu, 0)) {
            DEBUG(0,("setup_fault_pdu: failed to marshall RPC_HDR_RESP.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      if(!smb_io_rpc_hdr_fault("fault", &fault_resp, &outgoing_pdu, 0)) {
            DEBUG(0,("setup_fault_pdu: failed to marshall RPC_HDR_FAULT.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      p->out_data.data_sent_length = 0;
      p->out_data.current_pdu_len = prs_offset(&outgoing_pdu);
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&outgoing_pdu);
      return True;
}

#if 0
/*******************************************************************
 Marshall a cancel_ack pdu.
 We should probably check the auth-verifier here.
*******************************************************************/

bool setup_cancel_ack_reply(pipes_struct *p, prs_struct *rpc_in_p)
{
      prs_struct outgoing_pdu;
      RPC_HDR ack_reply_hdr;

      /* Free any memory in the current return data buffer. */
      prs_mem_free(&p->out_data.rdata);

      /*
       * Marshall directly into the outgoing PDU space. We
       * must do this as we need to set to the bind response
       * header and are never sending more than one PDU here.
       */

      prs_init( &outgoing_pdu, 0, p->mem_ctx, MARSHALL);
      prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /*
       * Initialize a cancel_ack header.
       */

      init_rpc_hdr(&ack_reply_hdr, RPC_CANCEL_ACK, RPC_FLG_FIRST | RPC_FLG_LAST,
                  p->hdr.call_id, RPC_HEADER_LEN, 0);

      /*
       * Marshall the header into the outgoing PDU.
       */

      if(!smb_io_rpc_hdr("", &ack_reply_hdr, &outgoing_pdu, 0)) {
            DEBUG(0,("setup_cancel_ack_reply: marshalling of RPC_HDR failed.\n"));
            prs_mem_free(&outgoing_pdu);
            return False;
      }

      p->out_data.data_sent_length = 0;
      p->out_data.current_pdu_len = prs_offset(&outgoing_pdu);
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&outgoing_pdu);
      return True;
}
#endif

/*******************************************************************
 Ensure a bind request has the correct abstract & transfer interface.
 Used to reject unknown binds from Win2k.
*******************************************************************/

bool check_bind_req(struct pipes_struct *p, RPC_IFACE* abstract,
                    RPC_IFACE* transfer, uint32 context_id)
{
      char *pipe_name = p->name;
      int i=0;
      fstring pname;
      
      fstrcpy(pname,"\\PIPE\\");
      fstrcat(pname,pipe_name);

      DEBUG(3,("check_bind_req for %s\n", pname));

      /* we have to check all now since win2k introduced a new UUID on the lsaprpc pipe */
            
      for ( i=0; pipe_names[i].client_pipe; i++ ) {
            DEBUG(10,("checking %s\n", pipe_names[i].client_pipe));
            if ( strequal(pipe_names[i].client_pipe, pname)
                  && (abstract->version == pipe_names[i].abstr_syntax.version) 
                  && (memcmp(&abstract->uuid, &pipe_names[i].abstr_syntax.uuid, sizeof(struct GUID)) == 0)
                  && (transfer->version == pipe_names[i].trans_syntax.version)
                  && (memcmp(&transfer->uuid, &pipe_names[i].trans_syntax.uuid, sizeof(struct GUID)) == 0) ) {
                  struct api_struct       *fns = NULL;
                  int               n_fns = 0;
                  PIPE_RPC_FNS            *context_fns;
                  
                  if ( !(context_fns = SMB_MALLOC_P(PIPE_RPC_FNS)) ) {
                        DEBUG(0,("check_bind_req: malloc() failed!\n"));
                        return False;
                  }
                  
                  /* save the RPC function table associated with this bind */
                  
                  get_pipe_fns(i, &fns, &n_fns);
                  
                  context_fns->cmds = fns;
                  context_fns->n_cmds = n_fns;
                  context_fns->context_id = context_id;
                  
                  /* add to the list of open contexts */
                  
                  DLIST_ADD( p->contexts, context_fns );
                  
                  break;
            }
      }

      if(pipe_names[i].client_pipe == NULL) {
            return False;
      }

      return True;
}

/*******************************************************************
 Register commands to an RPC pipe
*******************************************************************/

NTSTATUS rpc_pipe_register_commands(int version, const char *clnt, const char *srv, const struct api_struct *cmds, int size)
{
        struct rpc_table *rpc_entry;

      if (!clnt || !srv || !cmds) {
            return NT_STATUS_INVALID_PARAMETER;
      }

      if (version != SMB_RPC_INTERFACE_VERSION) {
            DEBUG(0,("Can't register rpc commands!\n"
                   "You tried to register a rpc module with SMB_RPC_INTERFACE_VERSION %d"
                   ", while this version of samba uses version %d!\n", 
                   version,SMB_RPC_INTERFACE_VERSION));
            return NT_STATUS_OBJECT_TYPE_MISMATCH;
      }

      /* TODO: 
       *
       * we still need to make sure that don't register the same commands twice!!!
       * 
       * --metze
       */

        /* We use a temporary variable because this call can fail and 
           rpc_lookup will still be valid afterwards.  It could then succeed if
           called again later */
      rpc_lookup_size++;
        rpc_entry = SMB_REALLOC_ARRAY_KEEP_OLD_ON_ERROR(rpc_lookup, struct rpc_table, rpc_lookup_size);
        if (NULL == rpc_entry) {
                rpc_lookup_size--;
                DEBUG(0, ("rpc_pipe_register_commands: memory allocation failed\n"));
                return NT_STATUS_NO_MEMORY;
        } else {
                rpc_lookup = rpc_entry;
        }
        
        rpc_entry = rpc_lookup + (rpc_lookup_size - 1);
        ZERO_STRUCTP(rpc_entry);
        rpc_entry->pipe.clnt = SMB_STRDUP(clnt);
        rpc_entry->pipe.srv = SMB_STRDUP(srv);
        rpc_entry->cmds = cmds;
        rpc_entry->n_cmds = size;
        
        return NT_STATUS_OK;
}

/*******************************************************************
 Handle a SPNEGO krb5 bind auth.
*******************************************************************/

static bool pipe_spnego_auth_bind_kerberos(pipes_struct *p, prs_struct *rpc_in_p, RPC_HDR_AUTH *pauth_info,
            DATA_BLOB *psecblob, prs_struct *pout_auth)
{
      return False;
}

/*******************************************************************
 Handle the first part of a SPNEGO bind auth.
*******************************************************************/

static bool pipe_spnego_auth_bind_negotiate(pipes_struct *p, prs_struct *rpc_in_p,
                              RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
      DATA_BLOB blob;
      DATA_BLOB secblob;
      DATA_BLOB response;
      DATA_BLOB chal;
      char *OIDs[ASN1_MAX_OIDS];
        int i;
      NTSTATUS status;
        bool got_kerberos_mechanism = False;
      AUTH_NTLMSSP_STATE *a = NULL;
      RPC_HDR_AUTH auth_info;

      ZERO_STRUCT(secblob);
      ZERO_STRUCT(chal);
      ZERO_STRUCT(response);

      /* Grab the SPNEGO blob. */
      blob = data_blob(NULL,p->hdr.auth_len);

      if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
            DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to pull %u bytes - the SPNEGO auth header.\n",
                  (unsigned int)p->hdr.auth_len ));
            goto err;
      }

      if (blob.data[0] != ASN1_APPLICATION(0)) {
            goto err;
      }

      /* parse out the OIDs and the first sec blob */
      if (!parse_negTokenTarg(blob, OIDs, &secblob)) {
            DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to parse the security blob.\n"));
            goto err;
        }

      if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 || strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
            got_kerberos_mechanism = True;
      }

      for (i=0;OIDs[i];i++) {
            DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got OID %s\n", OIDs[i]));
            SAFE_FREE(OIDs[i]);
      }
      DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got secblob of size %lu\n", (unsigned long)secblob.length));

      if ( got_kerberos_mechanism && ((lp_security()==SEC_ADS) || lp_use_kerberos_keytab()) ) {
            bool ret = pipe_spnego_auth_bind_kerberos(p, rpc_in_p, pauth_info, &secblob, pout_auth);
            data_blob_free(&secblob);
            data_blob_free(&blob);
            return ret;
      }

      if (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP && p->auth.a_u.auth_ntlmssp_state) {
            /* Free any previous auth type. */
            free_pipe_ntlmssp_auth_data(&p->auth);
      }

      /* Initialize the NTLM engine. */
      status = auth_ntlmssp_start(&a);
      if (!NT_STATUS_IS_OK(status)) {
            goto err;
      }

      /*
       * Pass the first security blob of data to it.
       * This can return an error or NT_STATUS_MORE_PROCESSING_REQUIRED
       * which means we need another packet to complete the bind.
       */

        status = auth_ntlmssp_update(a, secblob, &chal);

      if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
            DEBUG(3,("pipe_spnego_auth_bind_negotiate: auth_ntlmssp_update failed.\n"));
            goto err;
      }

      /* Generate the response blob we need for step 2 of the bind. */
      response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);

      /* Copy the blob into the pout_auth parse struct */
      init_rpc_hdr_auth(&auth_info, RPC_SPNEGO_AUTH_TYPE, pauth_info->auth_level, RPC_HDR_AUTH_LEN, 1);
      if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
            DEBUG(0,("pipe_spnego_auth_bind_negotiate: marshalling of RPC_HDR_AUTH failed.\n"));
            goto err;
      }

      if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
            DEBUG(0,("pipe_spnego_auth_bind_negotiate: marshalling of data blob failed.\n"));
            goto err;
      }

      p->auth.a_u.auth_ntlmssp_state = a;
      p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
      p->auth.auth_type = PIPE_AUTH_TYPE_SPNEGO_NTLMSSP;

      data_blob_free(&blob);
      data_blob_free(&secblob);
      data_blob_free(&chal);
      data_blob_free(&response);

      /* We can't set pipe_bound True yet - we need an RPC_ALTER_CONTEXT response packet... */
      return True;

 err:

      data_blob_free(&blob);
      data_blob_free(&secblob);
      data_blob_free(&chal);
      data_blob_free(&response);

      p->auth.a_u.auth_ntlmssp_state = NULL;

      return False;
}

/*******************************************************************
 Handle the second part of a SPNEGO bind auth.
*******************************************************************/

static bool pipe_spnego_auth_bind_continue(pipes_struct *p, prs_struct *rpc_in_p,
                              RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
      RPC_HDR_AUTH auth_info;
      DATA_BLOB spnego_blob;
      DATA_BLOB auth_blob;
      DATA_BLOB auth_reply;
      DATA_BLOB response;
      AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;

      ZERO_STRUCT(spnego_blob);
      ZERO_STRUCT(auth_blob);
      ZERO_STRUCT(auth_reply);
      ZERO_STRUCT(response);

      if (p->auth.auth_type != PIPE_AUTH_TYPE_SPNEGO_NTLMSSP || !a) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: not in NTLMSSP auth state.\n"));
            goto err;
      }

      /* Grab the SPNEGO blob. */
      spnego_blob = data_blob(NULL,p->hdr.auth_len);

      if (!prs_copy_data_out((char *)spnego_blob.data, rpc_in_p, p->hdr.auth_len)) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: Failed to pull %u bytes - the SPNEGO auth header.\n",
                  (unsigned int)p->hdr.auth_len ));
            goto err;
      }

      if (spnego_blob.data[0] != ASN1_CONTEXT(1)) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob type.\n"));
            goto err;
      }

      if (!spnego_parse_auth(spnego_blob, &auth_blob)) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob.\n"));
            goto err;
      }

      /*
       * The following call actually checks the challenge/response data.
       * for correctness against the given DOMAIN\user name.
       */
      
      if (!pipe_ntlmssp_verify_final(p, &auth_blob)) {
            goto err;
      }

      data_blob_free(&spnego_blob);
      data_blob_free(&auth_blob);

      /* Generate the spnego "accept completed" blob - no incoming data. */
      response = spnego_gen_auth_response(&auth_reply, NT_STATUS_OK, OID_NTLMSSP);

      /* Copy the blob into the pout_auth parse struct */
      init_rpc_hdr_auth(&auth_info, RPC_SPNEGO_AUTH_TYPE, pauth_info->auth_level, RPC_HDR_AUTH_LEN, 1);
      if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: marshalling of RPC_HDR_AUTH failed.\n"));
            goto err;
      }

      if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
            DEBUG(0,("pipe_spnego_auth_bind_continue: marshalling of data blob failed.\n"));
            goto err;
      }

      data_blob_free(&auth_reply);
      data_blob_free(&response);

      p->pipe_bound = True;

      return True;

 err:

      data_blob_free(&spnego_blob);
      data_blob_free(&auth_blob);
      data_blob_free(&auth_reply);
      data_blob_free(&response);

      free_pipe_ntlmssp_auth_data(&p->auth);
      p->auth.a_u.auth_ntlmssp_state = NULL;

      return False;
}

/*******************************************************************
 Handle an schannel bind auth.
*******************************************************************/

static bool pipe_schannel_auth_bind(pipes_struct *p, prs_struct *rpc_in_p,
                              RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
      RPC_HDR_AUTH auth_info;
      RPC_AUTH_SCHANNEL_NEG neg;
      RPC_AUTH_VERIFIER auth_verifier;
      bool ret;
      struct dcinfo *pdcinfo;
      uint32 flags;

      if (!smb_io_rpc_auth_schannel_neg("", &neg, rpc_in_p, 0)) {
            DEBUG(0,("pipe_schannel_auth_bind: Could not unmarshal SCHANNEL auth neg\n"));
            return False;
      }

      /*
       * The neg.myname key here must match the remote computer name
       * given in the DOM_CLNT_SRV.uni_comp_name used on all netlogon pipe
       * operations that use credentials.
       */

      become_root();
      ret = secrets_restore_schannel_session_info(p->mem_ctx, neg.myname, &pdcinfo);
      unbecome_root();

      if (!ret) {
            DEBUG(0, ("pipe_schannel_auth_bind: Attempt to bind using schannel without successful serverauth2\n"));
            return False;
      }

      p->auth.a_u.schannel_auth = TALLOC_P(p->pipe_state_mem_ctx, struct schannel_auth_struct);
      if (!p->auth.a_u.schannel_auth) {
            TALLOC_FREE(pdcinfo);
            return False;
      }

      memset(p->auth.a_u.schannel_auth->sess_key, 0, sizeof(p->auth.a_u.schannel_auth->sess_key));
      memcpy(p->auth.a_u.schannel_auth->sess_key, pdcinfo->sess_key,
                  sizeof(pdcinfo->sess_key));

      TALLOC_FREE(pdcinfo);

      p->auth.a_u.schannel_auth->seq_num = 0;

      /*
       * JRA. Should we also copy the schannel session key into the pipe session key p->session_key
       * here ? We do that for NTLMSSP, but the session key is already set up from the vuser
       * struct of the person who opened the pipe. I need to test this further. JRA.
       *
       * VL. As we are mapping this to guest set the generic key
       * "SystemLibraryDTC" key here. It's a bit difficult to test against
       * W2k3, as it does not allow schannel binds against SAMR and LSA
       * anymore.
       */

      data_blob_free(&p->session_key);
      p->session_key = generic_session_key();
      if (p->session_key.data == NULL) {
            DEBUG(0, ("pipe_schannel_auth_bind: Could not alloc session"
                    " key\n"));
            return False;
      }

      init_rpc_hdr_auth(&auth_info, RPC_SCHANNEL_AUTH_TYPE, pauth_info->auth_level, RPC_HDR_AUTH_LEN, 1);
      if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
            DEBUG(0,("pipe_schannel_auth_bind: marshalling of RPC_HDR_AUTH failed.\n"));
            return False;
      }

      /*** SCHANNEL verifier ***/

      init_rpc_auth_verifier(&auth_verifier, "\001", 0x0);
      if(!smb_io_rpc_schannel_verifier("", &auth_verifier, pout_auth, 0)) {
            DEBUG(0,("pipe_schannel_auth_bind: marshalling of RPC_AUTH_VERIFIER failed.\n"));
            return False;
      }

      prs_align(pout_auth);

      flags = 5;
      if(!prs_uint32("flags ", pout_auth, 0, &flags)) {
            return False;
      }

      DEBUG(10,("pipe_schannel_auth_bind: schannel auth: domain [%s] myname [%s]\n",
            neg.domain, neg.myname));

      /* We're finished with this bind - no more packets. */
      p->auth.auth_data_free_func = NULL;
      p->auth.auth_type = PIPE_AUTH_TYPE_SCHANNEL;

      p->pipe_bound = True;

      return True;
}

/*******************************************************************
 Handle an NTLMSSP bind auth.
*******************************************************************/

static bool pipe_ntlmssp_auth_bind(pipes_struct *p, prs_struct *rpc_in_p,
                              RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
      RPC_HDR_AUTH auth_info;
        DATA_BLOB blob;
      DATA_BLOB response;
        NTSTATUS status;
      AUTH_NTLMSSP_STATE *a = NULL;

      ZERO_STRUCT(blob);
      ZERO_STRUCT(response);

      /* Grab the NTLMSSP blob. */
      blob = data_blob(NULL,p->hdr.auth_len);

      if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: Failed to pull %u bytes - the NTLM auth header.\n",
                  (unsigned int)p->hdr.auth_len ));
            goto err;
      }

      if (strncmp((char *)blob.data, "NTLMSSP", 7) != 0) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: Failed to read NTLMSSP in blob\n"));
                goto err;
        }

      /* We have an NTLMSSP blob. */
      status = auth_ntlmssp_start(&a);
      if (!NT_STATUS_IS_OK(status)) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_start failed: %s\n",
                  nt_errstr(status) ));
            goto err;
      }

      status = auth_ntlmssp_update(a, blob, &response);
      if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_update failed: %s\n",
                  nt_errstr(status) ));
            goto err;
      }

      data_blob_free(&blob);

      /* Copy the blob into the pout_auth parse struct */
      init_rpc_hdr_auth(&auth_info, RPC_NTLMSSP_AUTH_TYPE, pauth_info->auth_level, RPC_HDR_AUTH_LEN, 1);
      if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: marshalling of RPC_HDR_AUTH failed.\n"));
            goto err;
      }

      if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
            DEBUG(0,("pipe_ntlmssp_auth_bind: marshalling of data blob failed.\n"));
            goto err;
      }

      p->auth.a_u.auth_ntlmssp_state = a;
      p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
      p->auth.auth_type = PIPE_AUTH_TYPE_NTLMSSP;

      data_blob_free(&blob);
      data_blob_free(&response);

      DEBUG(10,("pipe_ntlmssp_auth_bind: NTLMSSP auth started\n"));

      /* We can't set pipe_bound True yet - we need an RPC_AUTH3 response packet... */
      return True;

  err:

      data_blob_free(&blob);
      data_blob_free(&response);

      free_pipe_ntlmssp_auth_data(&p->auth);
      p->auth.a_u.auth_ntlmssp_state = NULL;
      return False;
}

/*******************************************************************
 Respond to a pipe bind request.
*******************************************************************/

bool api_pipe_bind_req(pipes_struct *p, prs_struct *rpc_in_p)
{
      RPC_HDR_BA hdr_ba;
      RPC_HDR_RB hdr_rb;
      RPC_HDR_AUTH auth_info;
      uint16 assoc_gid;
      fstring ack_pipe_name;
      prs_struct out_hdr_ba;
      prs_struct out_auth;
      prs_struct outgoing_rpc;
      int i = 0;
      int auth_len = 0;
      unsigned int auth_type = RPC_ANONYMOUS_AUTH_TYPE;

      /* No rebinds on a bound pipe - use alter context. */
      if (p->pipe_bound) {
            DEBUG(2,("api_pipe_bind_req: rejecting bind request on bound pipe %s.\n", p->pipe_srv_name));
            return setup_bind_nak(p);
      }

      prs_init( &outgoing_rpc, 0, p->mem_ctx, MARSHALL);

      /* 
       * Marshall directly into the outgoing PDU space. We
       * must do this as we need to set to the bind response
       * header and are never sending more than one PDU here.
       */

      prs_give_memory( &outgoing_rpc, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /*
       * Setup the memory to marshall the ba header, and the
       * auth footers.
       */

      if(!prs_init(&out_hdr_ba, 1024, p->mem_ctx, MARSHALL)) {
            DEBUG(0,("api_pipe_bind_req: malloc out_hdr_ba failed.\n"));
            prs_mem_free(&outgoing_rpc);
            return False;
      }

      if(!prs_init(&out_auth, 1024, p->mem_ctx, MARSHALL)) {
            DEBUG(0,("api_pipe_bind_req: malloc out_auth failed.\n"));
            prs_mem_free(&outgoing_rpc);
            prs_mem_free(&out_hdr_ba);
            return False;
      }

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

      /*
       * Try and find the correct pipe name to ensure
       * that this is a pipe name we support.
       */


      for (i = 0; i < rpc_lookup_size; i++) {
              if (strequal(rpc_lookup[i].pipe.clnt, p->name)) {
                  DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
                        rpc_lookup[i].pipe.clnt, rpc_lookup[i].pipe.srv));
                  fstrcpy(p->pipe_srv_name, rpc_lookup[i].pipe.srv);
                  break;
            }
      }

      if (i == rpc_lookup_size) {
            if (NT_STATUS_IS_ERR(smb_probe_module("rpc", p->name))) {
                       DEBUG(3,("api_pipe_bind_req: Unknown pipe name %s in bind request.\n",
                                p->name ));
                  prs_mem_free(&outgoing_rpc);
                  prs_mem_free(&out_hdr_ba);
                  prs_mem_free(&out_auth);

                  return setup_bind_nak(p);
                }

                for (i = 0; i < rpc_lookup_size; i++) {
                       if (strequal(rpc_lookup[i].pipe.clnt, p->name)) {
                               DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
                                         rpc_lookup[i].pipe.clnt, rpc_lookup[i].pipe.srv));
                               fstrcpy(p->pipe_srv_name, rpc_lookup[i].pipe.srv);
                               break;
                       }
                }

            if (i == rpc_lookup_size) {
                  DEBUG(0, ("module %s doesn't provide functions for pipe %s!\n", p->name, p->name));
                  goto err_exit;
            }
      }

      /* decode the bind request */
      if(!smb_io_rpc_hdr_rb("", &hdr_rb, rpc_in_p, 0))  {
            DEBUG(0,("api_pipe_bind_req: unable to unmarshall RPC_HDR_RB struct.\n"));
            goto err_exit;
      }

      /* 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__));

      /*
       * Check if this is an authenticated bind request.
       */

      if (p->hdr.auth_len) {
            /* 
             * Decode the authentication verifier.
             */

            if(!smb_io_rpc_hdr_auth("", &auth_info, rpc_in_p, 0)) {
                  DEBUG(0,("api_pipe_bind_req: unable to unmarshall RPC_HDR_AUTH struct.\n"));
                  goto err_exit;
            }

            auth_type = auth_info.auth_type;

            /* Work out if we have to sign or seal etc. */
            switch (auth_info.auth_level) {
                  case RPC_AUTH_LEVEL_INTEGRITY:
                        p->auth.auth_level = PIPE_AUTH_LEVEL_INTEGRITY;
                        break;
                  case RPC_AUTH_LEVEL_PRIVACY:
                        p->auth.auth_level = PIPE_AUTH_LEVEL_PRIVACY;
                        break;
                  default:
                        DEBUG(0,("api_pipe_bind_req: unexpected auth level (%u).\n",
                              (unsigned int)auth_info.auth_level ));
                        goto err_exit;
            }
      } else {
            ZERO_STRUCT(auth_info);
      }

      assoc_gid = hdr_rb.bba.assoc_gid ? hdr_rb.bba.assoc_gid : 0x53f0;

      switch(auth_type) {
            case RPC_NTLMSSP_AUTH_TYPE:
                  if (!pipe_ntlmssp_auth_bind(p, rpc_in_p, &auth_info, &out_auth)) {
                        goto err_exit;
                  }
                  assoc_gid = 0x7a77;
                  break;

            case RPC_SCHANNEL_AUTH_TYPE:
                  if (!pipe_schannel_auth_bind(p, rpc_in_p, &auth_info, &out_auth)) {
                        goto err_exit;
                  }
                  break;

            case RPC_SPNEGO_AUTH_TYPE:
                  if (!pipe_spnego_auth_bind_negotiate(p, rpc_in_p, &auth_info, &out_auth)) {
                        goto err_exit;
                  }
                  break;

            case RPC_ANONYMOUS_AUTH_TYPE:
                  /* Unauthenticated bind request. */
                  /* Get the authenticated pipe user from current_user */
                  if (!copy_current_user(&p->pipe_user, &current_user)) {
                        DEBUG(10, ("Could not copy current user\n"));
                        goto err_exit;
                  }
                  /* We're finished - no more packets. */
                  p->auth.auth_type = PIPE_AUTH_TYPE_NONE;
                  /* We must set the pipe auth_level here also. */
                  p->auth.auth_level = PIPE_AUTH_LEVEL_NONE;
                  p->pipe_bound = True;
                  /* The session key was initialized from the SMB
                   * session in make_internal_rpc_pipe_p */
                  break;

            default:
                  DEBUG(0,("api_pipe_bind_req: unknown auth type %x requested.\n", auth_type ));
                  goto err_exit;
      }

      /*
       * Create the bind response struct.
       */

      /* If the requested abstract synt uuid doesn't match our client pipe,
            reject the bind_ack & set the transfer interface synt to all 0's,
            ver 0 (observed when NT5 attempts to bind to abstract interfaces
            unknown to NT4)
            Needed when adding entries to a DACL from NT5 - SK */

      if(check_bind_req(p, &hdr_rb.rpc_context[0].abstract, &hdr_rb.rpc_context[0].transfer[0],
                        hdr_rb.rpc_context[0].context_id )) {
            init_rpc_hdr_ba(&hdr_ba,
                      RPC_MAX_PDU_FRAG_LEN,
                      RPC_MAX_PDU_FRAG_LEN,
                      assoc_gid,
                      ack_pipe_name,
                      0x1, 0x0, 0x0,
                      &hdr_rb.rpc_context[0].transfer[0]);
      } else {
            RPC_IFACE null_interface;
            ZERO_STRUCT(null_interface);
            /* Rejection reason: abstract syntax not supported */
            init_rpc_hdr_ba(&hdr_ba, RPC_MAX_PDU_FRAG_LEN,
                              RPC_MAX_PDU_FRAG_LEN, assoc_gid,
                              ack_pipe_name, 0x1, 0x2, 0x1,
                              &null_interface);
            p->pipe_bound = False;
      }

      /*
       * and marshall it.
       */

      if(!smb_io_rpc_hdr_ba("", &hdr_ba, &out_hdr_ba, 0)) {
            DEBUG(0,("api_pipe_bind_req: marshalling of RPC_HDR_BA failed.\n"));
            goto err_exit;
      }

      /*
       * Create the header, now we know the length.
       */

      if (prs_offset(&out_auth)) {
            auth_len = prs_offset(&out_auth) - RPC_HDR_AUTH_LEN;
      }

      init_rpc_hdr(&p->hdr, RPC_BINDACK, RPC_FLG_FIRST | RPC_FLG_LAST,
                  p->hdr.call_id,
                  RPC_HEADER_LEN + prs_offset(&out_hdr_ba) + prs_offset(&out_auth),
                  auth_len);

      /*
       * Marshall the header into the outgoing PDU.
       */

      if(!smb_io_rpc_hdr("", &p->hdr, &outgoing_rpc, 0)) {
            DEBUG(0,("api_pipe_bind_req: marshalling of RPC_HDR failed.\n"));
            goto err_exit;
      }

      /*
       * Now add the RPC_HDR_BA and any auth needed.
       */

      if(!prs_append_prs_data( &outgoing_rpc, &out_hdr_ba)) {
            DEBUG(0,("api_pipe_bind_req: append of RPC_HDR_BA failed.\n"));
            goto err_exit;
      }

      if (auth_len && !prs_append_prs_data( &outgoing_rpc, &out_auth)) {
            DEBUG(0,("api_pipe_bind_req: append of auth info failed.\n"));
            goto err_exit;
      }

      /*
       * Setup the lengths for the initial reply.
       */

      p->out_data.data_sent_length = 0;
      p->out_data.current_pdu_len = prs_offset(&outgoing_rpc);
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&out_hdr_ba);
      prs_mem_free(&out_auth);

      return True;

  err_exit:

      prs_mem_free(&outgoing_rpc);
      prs_mem_free(&out_hdr_ba);
      prs_mem_free(&out_auth);
      return setup_bind_nak(p);
}

/****************************************************************************
 Deal with an alter context call. Can be third part of 3 leg auth request for
 SPNEGO calls.
****************************************************************************/

bool api_pipe_alter_context(pipes_struct *p, prs_struct *rpc_in_p)
{
      RPC_HDR_BA hdr_ba;
      RPC_HDR_RB hdr_rb;
      RPC_HDR_AUTH auth_info;
      uint16 assoc_gid;
      fstring ack_pipe_name;
      prs_struct out_hdr_ba;
      prs_struct out_auth;
      prs_struct outgoing_rpc;
      int auth_len = 0;

      prs_init( &outgoing_rpc, 0, p->mem_ctx, MARSHALL);

      /* 
       * Marshall directly into the outgoing PDU space. We
       * must do this as we need to set to the bind response
       * header and are never sending more than one PDU here.
       */

      prs_give_memory( &outgoing_rpc, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);

      /*
       * Setup the memory to marshall the ba header, and the
       * auth footers.
       */

      if(!prs_init(&out_hdr_ba, 1024, p->mem_ctx, MARSHALL)) {
            DEBUG(0,("api_pipe_alter_context: malloc out_hdr_ba failed.\n"));
            prs_mem_free(&outgoing_rpc);
            return False;
      }

      if(!prs_init(&out_auth, 1024, p->mem_ctx, MARSHALL)) {
            DEBUG(0,("api_pipe_alter_context: malloc out_auth failed.\n"));
            prs_mem_free(&outgoing_rpc);
            prs_mem_free(&out_hdr_ba);
            return False;
      }

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

      /* decode the alter context request */
      if(!smb_io_rpc_hdr_rb("", &hdr_rb, rpc_in_p, 0))  {
            DEBUG(0,("api_pipe_alter_context: unable to unmarshall RPC_HDR_RB struct.\n"));
            goto err_exit;
      }

      /* secondary address CAN be NULL
       * as the specs say it's ignored.
       * It MUST be NULL to have the spoolss working.
       */
      fstrcpy(ack_pipe_name,"");

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

      /*
       * Check if this is an authenticated alter context request.
       */

      if (p->hdr.auth_len != 0) {
            /* 
             * Decode the authentication verifier.
             */

            if(!smb_io_rpc_hdr_auth("", &auth_info, rpc_in_p, 0)) {
                  DEBUG(0,("api_pipe_alter_context: unable to unmarshall RPC_HDR_AUTH struct.\n"));
                  goto err_exit;
            }

            /*
             * Currently only the SPNEGO auth type uses the alter ctx
             * response in place of the NTLMSSP auth3 type.
             */

            if (auth_info.auth_type == RPC_SPNEGO_AUTH_TYPE) {
                  /* We can only finish if the pipe is unbound. */
                  if (!p->pipe_bound) {
                        if (!pipe_spnego_auth_bind_continue(p, rpc_in_p, &auth_info, &out_auth)) {
                              goto err_exit;
                        }
                  } else {
                        goto err_exit;
                  }
            }
      } else {
            ZERO_STRUCT(auth_info);
      }

      assoc_gid = hdr_rb.bba.assoc_gid ? hdr_rb.bba.assoc_gid : 0x53f0;

      /*
       * Create the bind response struct.
       */

      /* If the requested abstract synt uuid doesn't match our client pipe,
            reject the bind_ack & set the transfer interface synt to all 0's,
            ver 0 (observed when NT5 attempts to bind to abstract interfaces
            unknown to NT4)
            Needed when adding entries to a DACL from NT5 - SK */

      if(check_bind_req(p, &hdr_rb.rpc_context[0].abstract, &hdr_rb.rpc_context[0].transfer[0],
                        hdr_rb.rpc_context[0].context_id )) {
            init_rpc_hdr_ba(&hdr_ba,
                      RPC_MAX_PDU_FRAG_LEN,
                      RPC_MAX_PDU_FRAG_LEN,
                      assoc_gid,
                      ack_pipe_name,
                      0x1, 0x0, 0x0,
                      &hdr_rb.rpc_context[0].transfer[0]);
      } else {
            RPC_IFACE null_interface;
            ZERO_STRUCT(null_interface);
            /* Rejection reason: abstract syntax not supported */
            init_rpc_hdr_ba(&hdr_ba, RPC_MAX_PDU_FRAG_LEN,
                              RPC_MAX_PDU_FRAG_LEN, assoc_gid,
                              ack_pipe_name, 0x1, 0x2, 0x1,
                              &null_interface);
            p->pipe_bound = False;
      }

      /*
       * and marshall it.
       */

      if(!smb_io_rpc_hdr_ba("", &hdr_ba, &out_hdr_ba, 0)) {
            DEBUG(0,("api_pipe_alter_context: marshalling of RPC_HDR_BA failed.\n"));
            goto err_exit;
      }

      /*
       * Create the header, now we know the length.
       */

      if (prs_offset(&out_auth)) {
            auth_len = prs_offset(&out_auth) - RPC_HDR_AUTH_LEN;
      }

      init_rpc_hdr(&p->hdr, RPC_ALTCONTRESP, RPC_FLG_FIRST | RPC_FLG_LAST,
                  p->hdr.call_id,
                  RPC_HEADER_LEN + prs_offset(&out_hdr_ba) + prs_offset(&out_auth),
                  auth_len);

      /*
       * Marshall the header into the outgoing PDU.
       */

      if(!smb_io_rpc_hdr("", &p->hdr, &outgoing_rpc, 0)) {
            DEBUG(0,("api_pipe_alter_context: marshalling of RPC_HDR failed.\n"));
            goto err_exit;
      }

      /*
       * Now add the RPC_HDR_BA and any auth needed.
       */

      if(!prs_append_prs_data( &outgoing_rpc, &out_hdr_ba)) {
            DEBUG(0,("api_pipe_alter_context: append of RPC_HDR_BA failed.\n"));
            goto err_exit;
      }

      if (auth_len && !prs_append_prs_data( &outgoing_rpc, &out_auth)) {
            DEBUG(0,("api_pipe_alter_context: append of auth info failed.\n"));
            goto err_exit;
      }

      /*
       * Setup the lengths for the initial reply.
       */

      p->out_data.data_sent_length = 0;
      p->out_data.current_pdu_len = prs_offset(&outgoing_rpc);
      p->out_data.current_pdu_sent = 0;

      prs_mem_free(&out_hdr_ba);
      prs_mem_free(&out_auth);

      return True;

  err_exit:

      prs_mem_free(&outgoing_rpc);
      prs_mem_free(&out_hdr_ba);
      prs_mem_free(&out_auth);
      return setup_bind_nak(p);
}

/****************************************************************************
 Deal with NTLMSSP sign & seal processing on an RPC request.
****************************************************************************/

bool api_pipe_ntlmssp_auth_process(pipes_struct *p, prs_struct *rpc_in,
                              uint32 *p_ss_padding_len, NTSTATUS *pstatus)
{
      RPC_HDR_AUTH auth_info;
      uint32 auth_len = p->hdr.auth_len;
      uint32 save_offset = prs_offset(rpc_in);
      AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;
      unsigned char *data = NULL;
      size_t data_len;
      unsigned char *full_packet_data = NULL;
      size_t full_packet_data_len;
      DATA_BLOB auth_blob;
      
      *pstatus = NT_STATUS_OK;

      if (p->auth.auth_level == PIPE_AUTH_LEVEL_NONE || p->auth.auth_level == PIPE_AUTH_LEVEL_CONNECT) {
            return True;
      }

      if (!a) {
            *pstatus = NT_STATUS_INVALID_PARAMETER;
            return False;
      }

      /* Ensure there's enough data for an authenticated request. */
      if ((auth_len > RPC_MAX_SIGN_SIZE) ||
                  (RPC_HEADER_LEN + RPC_HDR_REQ_LEN + RPC_HDR_AUTH_LEN + auth_len > p->hdr.frag_len)) {
            DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_len %u is too large.\n",
                  (unsigned int)auth_len ));
            *pstatus = NT_STATUS_INVALID_PARAMETER;
            return False;
      }

      /*
       * We need the full packet data + length (minus auth stuff) as well as the packet data + length
       * after the RPC header. 
       * We need to pass in the full packet (minus auth len) to the NTLMSSP sign and check seal
       * functions as NTLMv2 checks the rpc headers also.
       */

      data = (unsigned char *)(prs_data_p(rpc_in) + RPC_HDR_REQ_LEN);
      data_len = (size_t)(p->hdr.frag_len - RPC_HEADER_LEN - RPC_HDR_REQ_LEN - RPC_HDR_AUTH_LEN - auth_len);

      full_packet_data = p->in_data.current_in_pdu;
      full_packet_data_len = p->hdr.frag_len - auth_len;

      /* Pull the auth header and the following data into a blob. */
      if(!prs_set_offset(rpc_in, RPC_HDR_REQ_LEN + data_len)) {
            DEBUG(0,("api_pipe_ntlmssp_auth_process: cannot move offset to %u.\n",
                  (unsigned int)RPC_HDR_REQ_LEN + (unsigned int)data_len ));
            *pstatus = NT_STATUS_INVALID_PARAMETER;
            return False;
      }

      if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, rpc_in, 0)) {
            DEBUG(0,("api_pipe_ntlmssp_auth_process: failed to unmarshall RPC_HDR_AUTH.\n"));
            *pstatus = NT_STATUS_INVALID_PARAMETER;
            return False;
      }

      auth_blob.data = (unsigned char *)prs_data_p(rpc_in) + prs_offset(rpc_in);
      auth_blob.length = auth_len;
      
      switch (p->auth.auth_level) {
            case PIPE_AUTH_LEVEL_PRIVACY:
                  /* Data is encrypted. */
                  *pstatus = ntlmssp_unseal_packet(a->ntlmssp_state,
                                          data, data_len,
                                          full_packet_data,
                                          full_packet_data_len,
                                          &auth_blob);
                  if (!NT_STATUS_IS_OK(*pstatus)) {
                        return False;
                  }
                  break;
            case PIPE_AUTH_LEVEL_INTEGRITY:
                  /* Data is signed. */
                  *pstatus = ntlmssp_check_packet(a->ntlmssp_state,
                                          data, data_len,
                                          full_packet_data,
                                          full_packet_data_len,
                                          &auth_blob);
                  if (!NT_STATUS_IS_OK(*pstatus)) {
                        return False;
                  }
                  break;
            default:
                  *pstatus = NT_STATUS_INVALID_PARAMETER;
                  return False;
      }

      /*
       * Return the current pointer to the data offset.
       */

      if(!prs_set_offset(rpc_in, save_offset)) {
            DEBUG(0,("api_pipe_auth_process: failed to set offset back to %u\n",
                  (unsigned int)save_offset ));
            *pstatus = NT_STATUS_INVALID_PARAMETER;
            return False;
      }

      /*
       * Remember the padding length. We must remove it from the real data
       * stream once the sign/seal is done.
       */

      *p_ss_padding_len = auth_info.auth_pad_len;

      return True;
}

/****************************************************************************
 Deal with schannel processing on an RPC request.
****************************************************************************/

bool api_pipe_schannel_process(pipes_struct *p, prs_struct *rpc_in, uint32 *p_ss_padding_len)
{
      uint32 data_len;
      uint32 auth_len;
      uint32 save_offset = prs_offset(rpc_in);
      RPC_HDR_AUTH auth_info;
      RPC_AUTH_SCHANNEL_CHK schannel_chk;

      auth_len = p->hdr.auth_len;

      if (auth_len != RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN) {
            DEBUG(0,("Incorrect auth_len %u.\n", (unsigned int)auth_len ));
            return False;
      }

      /*
       * The following is that length of the data we must verify or unseal.
       * This doesn't include the RPC headers or the auth_len or the RPC_HDR_AUTH_LEN
       * preceeding the auth_data.
       */

      if (p->hdr.frag_len < RPC_HEADER_LEN + RPC_HDR_REQ_LEN + RPC_HDR_AUTH_LEN + auth_len) {
            DEBUG(0,("Incorrect frag %u, auth %u.\n",
                  (unsigned int)p->hdr.frag_len,
                  (unsigned int)auth_len ));
            return False;
      }

      data_len = p->hdr.frag_len - RPC_HEADER_LEN - RPC_HDR_REQ_LEN - 
            RPC_HDR_AUTH_LEN - auth_len;
      
      DEBUG(5,("data %d auth %d\n", data_len, auth_len));

      if(!prs_set_offset(rpc_in, RPC_HDR_REQ_LEN + data_len)) {
            DEBUG(0,("cannot move offset to %u.\n",
                   (unsigned int)RPC_HDR_REQ_LEN + data_len ));
            return False;
      }

      if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, rpc_in, 0)) {
            DEBUG(0,("failed to unmarshall RPC_HDR_AUTH.\n"));
            return False;
      }

      if (auth_info.auth_type != RPC_SCHANNEL_AUTH_TYPE) {
            DEBUG(0,("Invalid auth info %d on schannel\n",
                   auth_info.auth_type));
            return False;
      }

      if(!smb_io_rpc_auth_schannel_chk("", RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN, &schannel_chk, rpc_in, 0)) {
            DEBUG(0,("failed to unmarshal RPC_AUTH_SCHANNEL_CHK.\n"));
            return False;
      }

      if (!schannel_decode(p->auth.a_u.schannel_auth,
                     p->auth.auth_level,
                     SENDER_IS_INITIATOR,
                     &schannel_chk,
                     prs_data_p(rpc_in)+RPC_HDR_REQ_LEN, data_len)) {
            DEBUG(3,("failed to decode PDU\n"));
            return False;
      }

      /*
       * Return the current pointer to the data offset.
       */

      if(!prs_set_offset(rpc_in, save_offset)) {
            DEBUG(0,("failed to set offset back to %u\n",
                   (unsigned int)save_offset ));
            return False;
      }

      /* The sequence number gets incremented on both send and receive. */
      p->auth.a_u.schannel_auth->seq_num++;

      /*
       * Remember the padding length. We must remove it from the real data
       * stream once the sign/seal is done.
       */

      *p_ss_padding_len = auth_info.auth_pad_len;

      return True;
}

/****************************************************************************
 Return a user struct for a pipe user.
****************************************************************************/

struct current_user *get_current_user(struct current_user *user, pipes_struct *p)
{
      if (p->pipe_bound &&
                  (p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP ||
                  (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP))) {
            memcpy(user, &p->pipe_user, sizeof(struct current_user));
      } else {
            memcpy(user, &current_user, sizeof(struct current_user));
      }

      return user;
}

/****************************************************************************
 Find the set of RPC functions associated with this context_id
****************************************************************************/

static PIPE_RPC_FNS* find_pipe_fns_by_context( PIPE_RPC_FNS *list, uint32 context_id )
{
      PIPE_RPC_FNS *fns = NULL;
      PIPE_RPC_FNS *tmp = NULL;
      
      if ( !list ) {
            DEBUG(0,("find_pipe_fns_by_context: ERROR!  No context list for pipe!\n"));
            return NULL;
      }
      
      for (tmp=list; tmp; tmp=tmp->next ) {
            if ( tmp->context_id == context_id )
                  break;
      }
      
      fns = tmp;
      
      return fns;
}

/****************************************************************************
 Memory cleanup.
****************************************************************************/

void free_pipe_rpc_context( PIPE_RPC_FNS *list )
{
      PIPE_RPC_FNS *tmp = list;
      PIPE_RPC_FNS *tmp2;
            
      while (tmp) {
            tmp2 = tmp->next;
            SAFE_FREE(tmp);
            tmp = tmp2;
      }

      return;     
}

/****************************************************************************
 Find the correct RPC function to call for this request.
 If the pipe is authenticated then become the correct UNIX user
 before doing the call.
****************************************************************************/

bool api_pipe_request(pipes_struct *p)
{
      bool ret = False;
      bool changed_user = False;
      PIPE_RPC_FNS *pipe_fns;
      
      if (p->pipe_bound &&
                  ((p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) ||
                   (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP))) {
            if(!become_authenticated_pipe_user(p)) {
                  prs_mem_free(&p->out_data.rdata);
                  return False;
            }
            changed_user = True;
      }

      DEBUG(5, ("Requested \\PIPE\\%s\n", p->name));
      
      /* get the set of RPC functions for this context */
      
      pipe_fns = find_pipe_fns_by_context(p->contexts, p->hdr_req.context_id);
      
      if ( pipe_fns ) {
            TALLOC_CTX *frame = talloc_stackframe();
            ret = api_rpcTNP(p, p->name, pipe_fns->cmds, pipe_fns->n_cmds);
            TALLOC_FREE(frame);
      }
      else {
            DEBUG(0,("api_pipe_request: No rpc function table associated with context [%d] on pipe [%s]\n",
                  p->hdr_req.context_id, p->name));
      }

      if (changed_user) {
            unbecome_authenticated_pipe_user();
      }

      return ret;
}

/*******************************************************************
 Calls the underlying RPC function for a named pipe.
 ********************************************************************/

bool api_rpcTNP(pipes_struct *p, const char *rpc_name, 
            const struct api_struct *api_rpc_cmds, int n_cmds)
{
      int fn_num;
      fstring name;
      uint32 offset1, offset2;
 
      /* interpret the command */
      DEBUG(4,("api_rpcTNP: %s op 0x%x - ", rpc_name, p->hdr_req.opnum));

      slprintf(name, sizeof(name)-1, "in_%s", rpc_name);
      prs_dump(name, p->hdr_req.opnum, &p->in_data.data);

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

      if (fn_num == n_cmds) {
            /*
             * For an unknown RPC just return a fault PDU but
             * return True to allow RPC's on the pipe to continue
             * and not put the pipe into fault state. JRA.
             */
            DEBUG(4, ("unknown\n"));
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
            return True;
      }

      offset1 = prs_offset(&p->out_data.rdata);

        DEBUG(6, ("api_rpc_cmds[%d].fn == %p\n", 
                fn_num, api_rpc_cmds[fn_num].fn));
      /* do the actual command */
      if(!api_rpc_cmds[fn_num].fn(p)) {
            DEBUG(0,("api_rpcTNP: %s: %s failed.\n", rpc_name, api_rpc_cmds[fn_num].name));
            prs_mem_free(&p->out_data.rdata);
            return False;
      }

      if (p->bad_handle_fault_state) {
            DEBUG(4,("api_rpcTNP: bad handle fault return.\n"));
            p->bad_handle_fault_state = False;
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_CONTEXT_MISMATCH));
            return True;
      }

      if (p->rng_fault_state) {
            DEBUG(4, ("api_rpcTNP: rng fault return\n"));
            p->rng_fault_state = False;
            setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
            return True;
      }

      slprintf(name, sizeof(name)-1, "out_%s", rpc_name);
      offset2 = prs_offset(&p->out_data.rdata);
      prs_set_offset(&p->out_data.rdata, offset1);
      prs_dump(name, p->hdr_req.opnum, &p->out_data.rdata);
      prs_set_offset(&p->out_data.rdata, offset2);

      DEBUG(5,("api_rpcTNP: called %s successfully\n", rpc_name));

      /* Check for buffer underflow in rpc parsing */

      if ((DEBUGLEVEL >= 10) && 
          (prs_offset(&p->in_data.data) != prs_data_size(&p->in_data.data))) {
            size_t data_len = prs_data_size(&p->in_data.data) - prs_offset(&p->in_data.data);
            char *data = (char *)SMB_MALLOC(data_len);

            DEBUG(10, ("api_rpcTNP: rpc input buffer underflow (parse error?)\n"));
            if (data) {
                  prs_uint8s(False, "", &p->in_data.data, 0, (unsigned char *)data, (uint32)data_len);
                  SAFE_FREE(data);
            }

      }

      return True;
}

/*******************************************************************
*******************************************************************/

void get_pipe_fns( int idx, struct api_struct **fns, int *n_fns )
{
      struct api_struct *cmds = NULL;
      int               n_cmds = 0;

      switch ( idx ) {
            case PI_LSARPC:
                  lsa_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_DSSETUP:
                  dssetup_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_SAMR:
                  samr2_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_NETLOGON:
                  netlog_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_SRVSVC:
                  srvsvc2_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_WKSSVC:
                  wkssvc_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_WINREG:
                  winreg_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_SPOOLSS:
                  spoolss_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_NETDFS:
                  netdfs_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_SVCCTL:
                  svcctl2_get_pipe_fns( &cmds, &n_cmds );
                  break;
              case PI_EVENTLOG:
                  eventlog2_get_pipe_fns( &cmds, &n_cmds );
                  break;
            case PI_NTSVCS:
                  ntsvcs_get_pipe_fns( &cmds, &n_cmds );
                  break;
#ifdef DEVELOPER
            case PI_RPCECHO:
                  rpcecho_get_pipe_fns( &cmds, &n_cmds );
                  break;
#endif
            default:
                  DEBUG(0,("get_pipe_fns: Unknown pipe index! [%d]\n", idx));
      }

      *fns = cmds;
      *n_fns = n_cmds;

      return;
}

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