/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

RCSID("$Id$");

#ifdef  SPX
/*
 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
 * ALL RIGHTS RESERVED
 *
 * "Digital Equipment Corporation authorizes the reproduction,
 * distribution and modification of this software subject to the following
 * restrictions:
 *
 * 1.  Any partial or whole copy of this software, or any modification
 * thereof, must include this copyright notice in its entirety.
 *
 * 2.  This software is supplied "as is" with no warranty of any kind,
 * expressed or implied, for any purpose, including any warranty of fitness
 * or merchantibility.  DIGITAL assumes no responsibility for the use or
 * reliability of this software, nor promises to provide any form of
 * support for it on any basis.
 *
 * 3.  Distribution of this software is authorized only if no profit or
 * remuneration of any kind is received in exchange for such distribution.
 *
 * 4.  This software produces public key authentication certificates
 * bearing an expiration date established by DIGITAL and RSA Data
 * Security, Inc.  It may cease to generate certificates after the expiration
 * date.  Any modification of this software that changes or defeats
 * the expiration date or its effect is unauthorized.
 *
 * 5.  Software that will renew or extend the expiration date of
 * authentication certificates produced by this software may be obtained
 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
 * 94065, (415)595-8782, or from DIGITAL"
 *
 */

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ARPA_TELNET_H
#include <arpa/telnet.h>
#endif
#include <stdio.h>
#include "gssapi_defs.h"
#include <stdlib.h>
#include <string.h>

#include <pwd.h>
#ifdef SOCKS
#include <socks.h>
#endif

#include "encrypt.h"
#include "auth.h"
#include "misc.h"

extern auth_debug_mode;

static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
                                        AUTHTYPE_SPX, };
static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
                                        TELQUAL_NAME, };

#define SPX_AUTH        0               /* Authentication data follows */
#define SPX_REJECT      1               /* Rejected (reason might follow) */
#define SPX_ACCEPT      2               /* Accepted */

static des_key_schedule sched;
static des_cblock       challenge       = { 0 };


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

gss_OID_set             actual_mechs;
gss_OID                 actual_mech_type, output_name_type;
int                     major_status, status, msg_ctx = 0, new_status;
int                     req_flags = 0, ret_flags, lifetime_rec;
gss_cred_id_t           gss_cred_handle;
gss_ctx_id_t            actual_ctxhandle, context_handle;
gss_buffer_desc         output_token, input_token, input_name_buffer;
gss_buffer_desc         status_string;
gss_name_t              desired_targname, src_name;
gss_channel_bindings    input_chan_bindings;
char                    lhostname[GSS_C_MAX_PRINTABLE_NAME];
char                    targ_printable[GSS_C_MAX_PRINTABLE_NAME];
int                     to_addr=0, from_addr=0;
char                    *address;
gss_buffer_desc         fullname_buffer;
gss_OID                 fullname_type;
gss_cred_id_t           gss_delegated_cred_handle;

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



        static int
Data(ap, type, d, c)
        Authenticator *ap;
        int type;
        void *d;
        int c;
{
        unsigned char *p = str_data + 4;
        unsigned char *cd = (unsigned char *)d;

        if (c == -1)
                c = strlen((char *)cd);

        if (0) {
                printf("%s:%d: [%d] (%d)",
                        str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
                        str_data[3],
                        type, c);
                printd(d, c);
                printf("\r\n");
        }
        *p++ = ap->type;
        *p++ = ap->way;
        *p++ = type;
        while (c-- > 0) {
                if ((*p++ = *cd++) == IAC)
                        *p++ = IAC;
        }
        *p++ = IAC;
        *p++ = SE;
        if (str_data[3] == TELQUAL_IS)
                printsub('>', &str_data[2], p - (&str_data[2]));
        return(telnet_net_write(str_data, p - str_data));
}

        int
spx_init(ap, server)
        Authenticator *ap;
        int server;
{
        gss_cred_id_t   tmp_cred_handle;

        if (server) {
                str_data[3] = TELQUAL_REPLY;
                gethostname(lhostname, sizeof(lhostname));
                snprintf (targ_printable, sizeof(targ_printable),
                          "SERVICE:rcmd@%s", lhostname);
                input_name_buffer.length = strlen(targ_printable);
                input_name_buffer.value = targ_printable;
                major_status = gss_import_name(&status,
                                        &input_name_buffer,
                                        GSS_C_NULL_OID,
                                        &desired_targname);
                major_status = gss_acquire_cred(&status,
                                        desired_targname,
                                        0,
                                        GSS_C_NULL_OID_SET,
                                        GSS_C_ACCEPT,
                                        &tmp_cred_handle,
                                        &actual_mechs,
                                        &lifetime_rec);
                if (major_status != GSS_S_COMPLETE) return(0);
        } else {
                str_data[3] = TELQUAL_IS;
        }
        return(1);
}

        int
spx_send(ap)
        Authenticator *ap;
{
        des_cblock enckey;
        int r;

        gss_OID actual_mech_type, output_name_type;
        int     msg_ctx = 0, new_status, status;
        int     req_flags = 0, ret_flags, lifetime_rec, major_status;
        gss_buffer_desc  output_token, input_token, input_name_buffer;
        gss_buffer_desc  output_name_buffer, status_string;
        gss_name_t    desired_targname;
        gss_channel_bindings  input_chan_bindings;
        char targ_printable[GSS_C_MAX_PRINTABLE_NAME];
        int  from_addr=0, to_addr=0, myhostlen, j;
        int  deleg_flag=1, mutual_flag=0, replay_flag=0, seq_flag=0;
        char *address;

        printf("[ Trying SPX ... ]\r\n");
        snprintf (targ_printable, sizeof(targ_printable),
                  "SERVICE:rcmd@%s", RemoteHostName);

        input_name_buffer.length = strlen(targ_printable);
        input_name_buffer.value = targ_printable;

        if (!UserNameRequested) {
                return(0);
        }

        major_status = gss_import_name(&status,
                                        &input_name_buffer,
                                        GSS_C_NULL_OID,
                                        &desired_targname);


        major_status = gss_display_name(&status,
                                        desired_targname,
                                        &output_name_buffer,
                                        &output_name_type);

        printf("target is '%.*s'\n", (int)output_name_buffer.length,
                                        (char*)output_name_buffer.value);
        fflush(stdout);

        major_status = gss_release_buffer(&status, &output_name_buffer);

        input_chan_bindings = (gss_channel_bindings)
          malloc(sizeof(gss_channel_bindings_desc));

        input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
        input_chan_bindings->initiator_address.length = 4;
        address = (char *) malloc(4);
        input_chan_bindings->initiator_address.value = (char *) address;
        address[0] = ((from_addr & 0xff000000) >> 24);
        address[1] = ((from_addr & 0xff0000) >> 16);
        address[2] = ((from_addr & 0xff00) >> 8);
        address[3] = (from_addr & 0xff);
        input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
        input_chan_bindings->acceptor_address.length = 4;
        address = (char *) malloc(4);
        input_chan_bindings->acceptor_address.value = (char *) address;
        address[0] = ((to_addr & 0xff000000) >> 24);
        address[1] = ((to_addr & 0xff0000) >> 16);
        address[2] = ((to_addr & 0xff00) >> 8);
        address[3] = (to_addr & 0xff);
        input_chan_bindings->application_data.length = 0;

        req_flags = 0;
        if (deleg_flag)  req_flags = req_flags | 1;
        if (mutual_flag) req_flags = req_flags | 2;
        if (replay_flag) req_flags = req_flags | 4;
        if (seq_flag)    req_flags = req_flags | 8;

        major_status = gss_init_sec_context(&status,         /* minor status */
                                        GSS_C_NO_CREDENTIAL, /* cred handle */
                                        &actual_ctxhandle,   /* ctx handle */
                                        desired_targname,    /* target name */
                                        GSS_C_NULL_OID,      /* mech type */
                                        req_flags,           /* req flags */
                                        0,                   /* time req */
                                        input_chan_bindings, /* chan binding */
                                        GSS_C_NO_BUFFER,     /* input token */
                                        &actual_mech_type,   /* actual mech */
                                        &output_token,       /* output token */
                                        &ret_flags,          /* ret flags */
                                        &lifetime_rec);      /* time rec */

        if ((major_status != GSS_S_COMPLETE) &&
            (major_status != GSS_S_CONTINUE_NEEDED)) {
          gss_display_status(&new_status,
                                status,
                                GSS_C_MECH_CODE,
                                GSS_C_NULL_OID,
                                &msg_ctx,
                                &status_string);
          printf("%.*s\n", (int)status_string.length,
                                (char*)status_string.value);
          return(0);
        }

        if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
                return(0);
        }

        if (!Data(ap, SPX_AUTH, output_token.value, output_token.length)) {
                return(0);
        }

        return(1);
}

        void
spx_is(ap, data, cnt)
        Authenticator *ap;
        unsigned char *data;
        int cnt;
{
        Session_Key skey;
        des_cblock datablock;
        int r;

        if (cnt-- < 1)
                return;
        switch (*data++) {
        case SPX_AUTH:
                input_token.length = cnt;
                input_token.value = (char *) data;

                gethostname(lhostname, sizeof(lhostname));

                snprintf(targ_printable, sizeof(targ_printable),
                         "SERVICE:rcmd@%s", lhostname);

                input_name_buffer.length = strlen(targ_printable);
                input_name_buffer.value = targ_printable;

                major_status = gss_import_name(&status,
                                        &input_name_buffer,
                                        GSS_C_NULL_OID,
                                        &desired_targname);

                major_status = gss_acquire_cred(&status,
                                        desired_targname,
                                        0,
                                        GSS_C_NULL_OID_SET,
                                        GSS_C_ACCEPT,
                                        &gss_cred_handle,
                                        &actual_mechs,
                                        &lifetime_rec);

                major_status = gss_release_name(&status, desired_targname);

                input_chan_bindings = (gss_channel_bindings)
                  malloc(sizeof(gss_channel_bindings_desc));

                input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
                input_chan_bindings->initiator_address.length = 4;
                address = (char *) malloc(4);
                input_chan_bindings->initiator_address.value = (char *) address;
                address[0] = ((from_addr & 0xff000000) >> 24);
                address[1] = ((from_addr & 0xff0000) >> 16);
                address[2] = ((from_addr & 0xff00) >> 8);
                address[3] = (from_addr & 0xff);
                input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
                input_chan_bindings->acceptor_address.length = 4;
                address = (char *) malloc(4);
                input_chan_bindings->acceptor_address.value = (char *) address;
                address[0] = ((to_addr & 0xff000000) >> 24);
                address[1] = ((to_addr & 0xff0000) >> 16);
                address[2] = ((to_addr & 0xff00) >> 8);
                address[3] = (to_addr & 0xff);
                input_chan_bindings->application_data.length = 0;

                major_status = gss_accept_sec_context(&status,
                                                &context_handle,
                                                gss_cred_handle,
                                                &input_token,
                                                input_chan_bindings,
                                                &src_name,
                                                &actual_mech_type,
                                                &output_token,
                                                &ret_flags,
                                                &lifetime_rec,
                                                &gss_delegated_cred_handle);


                if (major_status != GSS_S_COMPLETE) {

                  major_status = gss_display_name(&status,
                                        src_name,
                                        &fullname_buffer,
                                        &fullname_type);
                        Data(ap, SPX_REJECT, "auth failed", -1);
                        auth_finished(ap, AUTH_REJECT);
                        return;
                }

                major_status = gss_display_name(&status,
                                        src_name,
                                        &fullname_buffer,
                                        &fullname_type);


                Data(ap, SPX_ACCEPT, output_token.value, output_token.length);
                auth_finished(ap, AUTH_USER);
                break;

        default:
                Data(ap, SPX_REJECT, 0, 0);
                break;
        }
}


        void
spx_reply(ap, data, cnt)
        Authenticator *ap;
        unsigned char *data;
        int cnt;
{
        Session_Key skey;

        if (cnt-- < 1)
                return;
        switch (*data++) {
        case SPX_REJECT:
                if (cnt > 0) {
                        printf("[ SPX refuses authentication because %.*s ]\r\n",
                                cnt, data);
                } else
                        printf("[ SPX refuses authentication ]\r\n");
                auth_send_retry();
                return;
        case SPX_ACCEPT:
                printf("[ SPX accepts you ]\r\n");
                if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
                        /*
                         * Send over the encrypted challenge.
                         */
                  input_token.value = (char *) data;
                  input_token.length = cnt;

                  major_status = gss_init_sec_context(&status, /* minor stat */
                                        GSS_C_NO_CREDENTIAL, /* cred handle */
                                        &actual_ctxhandle,   /* ctx handle */
                                        desired_targname,    /* target name */
                                        GSS_C_NULL_OID,      /* mech type */
                                        req_flags,           /* req flags */
                                        0,                   /* time req */
                                        input_chan_bindings, /* chan binding */
                                        &input_token,        /* input token */
                                        &actual_mech_type,   /* actual mech */
                                        &output_token,       /* output token */
                                        &ret_flags,          /* ret flags */
                                        &lifetime_rec);      /* time rec */

                  if (major_status != GSS_S_COMPLETE) {
                    gss_display_status(&new_status,
                                        status,
                                        GSS_C_MECH_CODE,
                                        GSS_C_NULL_OID,
                                        &msg_ctx,
                                        &status_string);
                    printf("[ SPX mutual response fails ... '%.*s' ]\r\n",
                         (int)status_string.length,
                         (char*)status_string.value);
                    auth_send_retry();
                    return;
                  }
                }
                auth_finished(ap, AUTH_USER);
                return;

        default:
                return;
        }
}

        int
spx_status(ap, name, name_sz, level)
        Authenticator *ap;
        char *name;
        size_t name_sz;
        int level;
{

        gss_buffer_desc  fullname_buffer, acl_file_buffer;
        gss_OID          fullname_type;
        char acl_file[160], fullname[160];
        int major_status, status = 0;
        struct passwd  *pwd;

        /*
         * hard code fullname to
         *   "SPX:/C=US/O=Digital/OU=LKG/OU=Sphinx/OU=Users/CN=Kannan Alagappan"
         * and acl_file to "~kannan/.sphinx"
         */

        pwd = k_getpwnam(UserNameRequested);
        if (pwd == NULL) {
          return(AUTH_USER);   /*  not authenticated  */
        }

        snprintf (acl_file, sizeof(acl_file),
                  "%s/.sphinx", pwd->pw_dir);

        acl_file_buffer.value = acl_file;
        acl_file_buffer.length = strlen(acl_file);

        major_status = gss_display_name(&status,
                                        src_name,
                                        &fullname_buffer,
                                        &fullname_type);

        if (level < AUTH_USER)
                return(level);

        major_status = gss__check_acl(&status, &fullname_buffer,
                                        &acl_file_buffer);

        if (major_status == GSS_S_COMPLETE) {
          strlcpy(name, UserNameRequested, name_sz);
          return(AUTH_VALID);
        } else {
           return(AUTH_USER);
        }

}

#define BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
#define ADDC(buf, len, c)       if ((len) > 0) {*(buf)++ = (c); --(len);}

        void
spx_printsub(unsigned char *data, size_t cnt,
             unsigned char *buf, size_t buflen)
{
        size_t i;

        buf[buflen-1] = '\0';           /* make sure it's NULL terminated */
        buflen -= 1;

        switch(data[3]) {
        case SPX_REJECT:                /* Rejected (reason might follow) */
                strlcpy((char *)buf, " REJECT ", buflen);
                goto common;

        case SPX_ACCEPT:                /* Accepted (name might follow) */
                strlcpy((char *)buf, " ACCEPT ", buflen);
        common:
                BUMP(buf, buflen);
                if (cnt <= 4)
                        break;
                ADDC(buf, buflen, '"');
                for (i = 4; i < cnt; i++)
                        ADDC(buf, buflen, data[i]);
                ADDC(buf, buflen, '"');
                ADDC(buf, buflen, '\0');
                break;

        case SPX_AUTH:                  /* Authentication data follows */
                strlcpy((char *)buf, " AUTH", buflen);
                goto common2;

        default:
                snprintf(buf, buflen, " %d (unknown)", data[3]);
        common2:
                BUMP(buf, buflen);
                for (i = 4; i < cnt; i++) {
                        snprintf(buf, buflen, " %d", data[i]);
                        BUMP(buf, buflen);
                }
                break;
        }
}

#endif

#ifdef notdef

prkey(msg, key)
        char *msg;
        unsigned char *key;
{
        int i;
        printf("%s:", msg);
        for (i = 0; i < 8; i++)
                printf(" %3d", key[i]);
        printf("\r\n");
}
#endif