r10656: BIG merge from trunk. Features not copied over

[Samba/nascimento.git] / source3 / rpc_server / 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 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.
 *
 */

#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

/*************************************************************
 HACK Alert!
 We need to transfer the session key from one rpc bind to the
 next. This is the way the netlogon schannel works.
**************************************************************/

struct dcinfo last_dcinfo;
BOOL server_auth2_negotiated = False;

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;
}

/*******************************************************************
 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(0x1c010002));
                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) {
                unsigned 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,
                                                        prs_data_p(&outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
                                                        data_len + ss_padding_len,
                                                        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,
                                                        prs_data_p(&outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
                                                        data_len + ss_padding_len,
                                                        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, 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(0x1c010002));
                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(0x1c010002));
                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: checking user details\n"));

        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. */
        delete_nt_token(&p->pipe_user.nt_user_token);
        p->pipe_user.ngroups = 0;
        SAFE_FREE( p->pipe_user.groups);

        status = auth_ntlmssp_update(a, *p_resp_blob, &reply);

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

        if (!NT_STATUS_IS_OK(status)) {
                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.uid = a->server_info->uid;
        p->pipe_user.gid = a->server_info->gid;
        
        /*
         * Copy the session key from the ntlmssp state.
         */

        data_blob_free(&p->session_key);
        p->session_key = data_blob(a->ntlmssp_state->session_key.data, a->ntlmssp_state->session_key.length);
        if (!p->session_key.data) {
                return False;
        }

        p->pipe_user.ngroups = a->server_info->n_groups;
        if (p->pipe_user.ngroups) {
                if (!(p->pipe_user.groups = memdup(a->server_info->groups, sizeof(gid_t) * p->pipe_user.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(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;
        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(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;
}

/*******************************************************************
 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 uuid)) == 0)
                        && (transfer->version == pipe_names[i].trans_syntax.version)
                        && (memcmp(&transfer->uuid, &pipe_names[i].trans_syntax.uuid, sizeof(struct uuid)) == 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(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 = SMB_REALLOC_ARRAY(rpc_entry->cmds, struct api_struct, rpc_entry->n_cmds + size);
        memcpy(rpc_entry->cmds + rpc_entry->n_cmds, cmds, size * sizeof(struct api_struct));
        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(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, 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)
{
        DATA_BLOB spnego_blob, auth_blob, auth_reply;
        AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;

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

        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(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);
        data_blob_free(&auth_reply);

        p->pipe_bound = True;

        return True;

 err:

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

        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;
        uint32 flags;

        if (!server_auth2_negotiated) {
                DEBUG(0, ("pipe_schannel_auth_bind: Attempt to bind using schannel without successful serverauth2\n"));
                return False;
        }

        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;
        }

        p->auth.a_u.schannel_auth = TALLOC_P(p->pipe_state_mem_ctx, struct schannel_auth_struct);
        if (!p->auth.a_u.schannel_auth) {
                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, last_dcinfo.sess_key, sizeof(last_dcinfo.sess_key));

        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 NTLMSPP, 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.
         */

        /* The client opens a second RPC NETLOGON pipe without
                doing a auth2. The credentials for the schannel are
                re-used from the auth2 the client did before. */
        p->dc = TALLOC_ZERO_P(p->pipe_state_mem_ctx, struct dcinfo);
        if (!p->dc) {
                return False;
        }
        *p->dc = last_dcinfo;

        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(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(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, 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. */
                        /* 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;
                        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 = 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 ) {
                set_current_rpc_talloc(p->mem_ctx);
                ret = api_rpcTNP(p, p->name, pipe_fns->cmds, pipe_fns->n_cmds);
                set_current_rpc_talloc(NULL);   
        }
        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(0x1c010002));
                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(0x1C00001A));
                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 = 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_LSARPC_DS:
                        lsa_ds_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_SAMR:
                        samr_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_NETLOGON:
                        netlog_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_SRVSVC:
                        srvsvc_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_WKSSVC:
                        wkssvc_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_WINREG:
                        reg_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:
                        svcctl_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_EVENTLOG:
                        eventlog_get_pipe_fns( &cmds, &n_cmds );
                        break;
                case PI_NTSVCS:
                        ntsvcs_get_pipe_fns( &cmds, &n_cmds );
                        break;
#ifdef DEVELOPER
                case PI_ECHO:
                        echo_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;
}