/*
 * Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * 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. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 "test_locl.h"
#include <gssapi.h>
#include "gss_common.h"
RCSID("$Id: gssapi_server.c,v 1.15 2000/08/09 20:53:07 assar Exp $");

static int
process_it(int sock,
	   gss_ctx_id_t context_hdl,
	   gss_name_t client_name
	   )
{
    OM_uint32 maj_stat, min_stat;
    gss_buffer_desc name_token;
    gss_buffer_desc real_input_token, real_output_token;
    gss_buffer_t input_token = &real_input_token,
	output_token = &real_output_token;

    maj_stat = gss_display_name (&min_stat,
				 client_name,
				 &name_token,
				 NULL);
    if (GSS_ERROR(maj_stat))
	gss_err (1, min_stat, "gss_display_name");

    fprintf (stderr, "User is `%.*s'\n", (int)name_token.length,
	    (char *)name_token.value);

    gss_release_buffer (&min_stat, &name_token);

    /* gss_verify_mic */

    read_token (sock, input_token);
    read_token (sock, output_token);

    maj_stat = gss_verify_mic (&min_stat,
			       context_hdl,
			       input_token,
			       output_token,
			       NULL);
    if (GSS_ERROR(maj_stat))
	gss_err (1, min_stat, "gss_verify_mic");

    fprintf (stderr, "gss_verify_mic: %.*s\n", (int)input_token->length,
	    (char *)input_token->value);

    gss_release_buffer (&min_stat, input_token);
    gss_release_buffer (&min_stat, output_token);

    /* gss_unwrap */

    read_token (sock, input_token);

    maj_stat = gss_unwrap (&min_stat,
			   context_hdl,
			   input_token,
			   output_token,
			   NULL,
			   NULL);
    if(GSS_ERROR(maj_stat))
	gss_err (1, min_stat, "gss_unwrap");

    fprintf (stderr, "gss_unwrap: %.*s\n", (int)output_token->length,
	    (char *)output_token->value);

    gss_release_buffer (&min_stat, input_token);
    gss_release_buffer (&min_stat, output_token);

    return 0;
}

static int
proto (int sock, const char *service)
{
    struct sockaddr_in remote, local;
    socklen_t addrlen;
    gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT;
    gss_buffer_desc real_input_token, real_output_token;
    gss_buffer_t input_token = &real_input_token,
	output_token = &real_output_token;
    OM_uint32 maj_stat, min_stat;
    gss_name_t client_name;
    struct gss_channel_bindings_struct input_chan_bindings;
    gss_cred_id_t delegated_cred_handle = NULL;
    krb5_ccache ccache;
    u_char init_buf[4];
    u_char acct_buf[4];

    addrlen = sizeof(local);
    if (getsockname (sock, (struct sockaddr *)&local, &addrlen) < 0
	|| addrlen != sizeof(local))
	err (1, "getsockname)");

    addrlen = sizeof(remote);
    if (getpeername (sock, (struct sockaddr *)&remote, &addrlen) < 0
	|| addrlen != sizeof(remote))
	err (1, "getpeername");

    input_chan_bindings.initiator_addrtype = GSS_C_AF_INET;
    input_chan_bindings.initiator_address.length = 4;
    init_buf[0] = (remote.sin_addr.s_addr >> 24) & 0xFF;
    init_buf[1] = (remote.sin_addr.s_addr >> 16) & 0xFF;
    init_buf[2] = (remote.sin_addr.s_addr >>  8) & 0xFF;
    init_buf[3] = (remote.sin_addr.s_addr >>  0) & 0xFF;

    input_chan_bindings.initiator_address.value = init_buf;
    input_chan_bindings.acceptor_addrtype = GSS_C_AF_INET;

    input_chan_bindings.acceptor_address.length = 4;
    acct_buf[0] = (local.sin_addr.s_addr >> 24) & 0xFF;
    acct_buf[1] = (local.sin_addr.s_addr >> 16) & 0xFF;
    acct_buf[2] = (local.sin_addr.s_addr >>  8) & 0xFF;
    acct_buf[3] = (local.sin_addr.s_addr >>  0) & 0xFF;
    input_chan_bindings.acceptor_address.value = acct_buf;
    input_chan_bindings.application_data.value = emalloc(4);
#if 0
    * (unsigned short *)input_chan_bindings.application_data.value =
                          remote.sin_port;
    * ((unsigned short *)input_chan_bindings.application_data.value + 1) =
                          local.sin_port;
    input_chan_bindings.application_data.length = 4;
#else
    input_chan_bindings.application_data.length = 0;
    input_chan_bindings.application_data.value = NULL;
#endif
    
    delegated_cred_handle = emalloc(sizeof(*delegated_cred_handle));
    memset((char*)delegated_cred_handle, 0, sizeof(*delegated_cred_handle));
    
    do {
	read_token (sock, input_token);
	maj_stat =
	    gss_accept_sec_context (&min_stat,
				    &context_hdl,
				    GSS_C_NO_CREDENTIAL,
				    input_token,
				    &input_chan_bindings,
				    &client_name,
				    NULL,
				    output_token,
				    NULL,
				    NULL,
				    /*&delegated_cred_handle*/ NULL);
	if(GSS_ERROR(maj_stat))
	    gss_err (1, min_stat, "gss_accept_sec_context");
	if (output_token->length != 0)
	    write_token (sock, output_token);
	if (GSS_ERROR(maj_stat)) {
	    if (context_hdl != GSS_C_NO_CONTEXT)
		gss_delete_sec_context (&min_stat,
					&context_hdl,
					GSS_C_NO_BUFFER);
	    break;
	}
    } while(maj_stat & GSS_S_CONTINUE_NEEDED);
    
    if (delegated_cred_handle->ccache) {
       krb5_context context;

       maj_stat = krb5_init_context(&context);
       maj_stat = krb5_cc_resolve(context, "FILE:/tmp/krb5cc_test", &ccache);
       maj_stat = krb5_cc_copy_cache(context,
                                      delegated_cred_handle->ccache, ccache);
       krb5_cc_close(context, ccache);
       krb5_cc_destroy(context, delegated_cred_handle->ccache);
    }

    if (fork_flag) {
	pid_t pid;
	int pipefd[2];

	if (pipe (pipefd) < 0)
	    err (1, "pipe");

	pid = fork ();
	if (pid < 0)
	    err (1, "fork");
	if (pid != 0) {
	    gss_buffer_desc buf;

	    maj_stat = gss_export_sec_context (&min_stat,
					       &context_hdl,
					       &buf);
	    if (GSS_ERROR(maj_stat))
		gss_err (1, min_stat, "gss_export_sec_context");
	    write_token (pipefd[1], &buf);
	    exit (0);
	} else {
	    gss_ctx_id_t context_hdl;
	    gss_buffer_desc buf;

	    close (pipefd[1]);
	    read_token (pipefd[0], &buf);
	    close (pipefd[0]);
	    maj_stat = gss_import_sec_context (&min_stat, &buf, &context_hdl);
	    if (GSS_ERROR(maj_stat))
		gss_err (1, min_stat, "gss_import_sec_context");
	    gss_release_buffer (&min_stat, &buf);
	    return process_it (sock, context_hdl, client_name);
	}
    } else {
	return process_it (sock, context_hdl, client_name);
    }
}

static int
doit (int port, const char *service)
{
    int sock, sock2;
    struct sockaddr_in my_addr;
    int one = 1;

    sock = socket (AF_INET, SOCK_STREAM, 0);
    if (sock < 0)
	err (1, "socket");

    memset (&my_addr, 0, sizeof(my_addr));
    my_addr.sin_family      = AF_INET;
    my_addr.sin_port        = port;
    my_addr.sin_addr.s_addr = INADDR_ANY;

    if (setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
		    (void *)&one, sizeof(one)) < 0)
	warn ("setsockopt SO_REUSEADDR");

    if (bind (sock, (struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
	err (1, "bind");

    if (listen (sock, 1) < 0)
	err (1, "listen");

    sock2 = accept (sock, NULL, NULL);
    if (sock2 < 0)
	err (1, "accept");

    return proto (sock2, service);
}

int
main(int argc, char **argv)
{
    krb5_context context = NULL; /* XXX */
    int port = server_setup(&context, argc, argv);
    return doit (port, service);
}