gss-misc.c   [plain text]

/*
 * Copyright 1994 by OpenVision Technologies, Inc.
 * 
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appears in all copies and
 * that both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of OpenVision not be used
 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission. OpenVision makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 * 
 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
/*
 * Copyright (C) 2003, 2004 by the Massachusetts Institute of Technology.
 * All rights reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 * 
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#if !defined(lint) && !defined(__CODECENTER__)
static char *rcsid = "$Header: /cvs/krbdev/krb5/src/appl/gss-sample/gss-misc.c,v 1.26 2004/02/11 18:04:36 tlyu Exp $";
#endif

#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#include <winsock.h>
#else
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#endif
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>

/* need struct timeval */
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif

#include <gssapi/gssapi_generic.h>
#include "gss-misc.h"

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern char *malloc();
#endif

FILE *display_file;

gss_buffer_desc empty_token_buf = { 0, (void *) "" };
gss_buffer_t empty_token = &empty_token_buf;

static void display_status_1
	(char *m, OM_uint32 code, int type);

static int write_all(int fildes, char *buf, unsigned int nbyte)
{
     int ret;
     char *ptr;

     for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
	  ret = send(fildes, ptr, nbyte, 0);
	  if (ret < 0) {
	       if (errno == EINTR)
		    continue;
	       return(ret);
	  } else if (ret == 0) {
	       return(ptr-buf);
	  }
     }

     return(ptr-buf);
}

static int read_all(int fildes, char *buf, unsigned int nbyte)
{
    int ret;
    char *ptr;
    fd_set rfds;
    struct timeval tv;

    FD_ZERO(&rfds);
    FD_SET(fildes, &rfds);
    tv.tv_sec = 10;
    tv.tv_usec = 0;

    for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
	if (select(FD_SETSIZE, &rfds, NULL, NULL, &tv) <= 0
	    || !FD_ISSET(fildes, &rfds))
	    return(ptr-buf);
	ret = recv(fildes, ptr, nbyte, 0);
	if (ret < 0) {
	    if (errno == EINTR)
		continue;
	    return(ret);
	} else if (ret == 0) {
	    return(ptr-buf);
	}
    }

    return(ptr-buf);
}

/*
 * Function: send_token
 *
 * Purpose: Writes a token to a file descriptor.
 *
 * Arguments:
 *
 * 	s		(r) an open file descriptor
 *	flags		(r) the flags to write
 * 	tok		(r) the token to write
 *
 * Returns: 0 on success, -1 on failure
 *
 * Effects:
 *
 * If the flags are non-null, send_token writes the token flags (a
 * single byte, even though they're passed in in an integer). Next,
 * the token length (as a network long) and then the token data are
 * written to the file descriptor s.  It returns 0 on success, and -1
 * if an error occurs or if it could not write all the data.
 */
int send_token(s, flags, tok)
     int s;
     int flags;
     gss_buffer_t tok;
{
     int len, ret;
     unsigned char char_flags = (unsigned char) flags;
     unsigned char lenbuf[4];

     if (char_flags) {
	 ret = write_all(s, (char *)&char_flags, 1);
	 if (ret != 1) {
	     perror("sending token flags");
	     return -1;
	 }
     }
     if (tok->length > 0xffffffffUL)
	 abort();
     lenbuf[0] = (tok->length >> 24) & 0xff;
     lenbuf[1] = (tok->length >> 16) & 0xff;
     lenbuf[2] = (tok->length >> 8) & 0xff;
     lenbuf[3] = tok->length & 0xff;

     ret = write_all(s, lenbuf, 4);
     if (ret < 0) {
	  perror("sending token length");
	  return -1;
     } else if (ret != 4) {
	 if (display_file)
	     fprintf(display_file, 
		     "sending token length: %d of %d bytes written\n", 
		     ret, 4);
	  return -1;
     }

     ret = write_all(s, tok->value, tok->length);
     if (ret < 0) {
	  perror("sending token data");
	  return -1;
     } else if (ret != tok->length) {
	 if (display_file)
	     fprintf(display_file, 
		     "sending token data: %d of %d bytes written\n", 
		     ret, (int) tok->length);
	 return -1;
     }
     
     return 0;
}

/*
 * Function: recv_token
 *
 * Purpose: Reads a token from a file descriptor.
 *
 * Arguments:
 *
 * 	s		(r) an open file descriptor
 *	flags		(w) the read flags
 * 	tok		(w) the read token
 *
 * Returns: 0 on success, -1 on failure
 *
 * Effects:
 * 
 * recv_token reads the token flags (a single byte, even though
 * they're stored into an integer, then reads the token length (as a
 * network long), allocates memory to hold the data, and then reads
 * the token data from the file descriptor s.  It blocks to read the
 * length and data, if necessary.  On a successful return, the token
 * should be freed with gss_release_buffer.  It returns 0 on success,
 * and -1 if an error occurs or if it could not read all the data.
 */
int recv_token(s, flags, tok)
     int s;
     int *flags;
     gss_buffer_t tok;
{
     int ret;
     unsigned char char_flags;
     unsigned char lenbuf[4];

     ret = read_all(s, (char *) &char_flags, 1);
     if (ret < 0) {
       perror("reading token flags");
       return -1;
     } else if (! ret) {
       if (display_file)
	 fputs("reading token flags: 0 bytes read\n", display_file);
       return -1;
     } else {
       *flags = (int) char_flags;
     }

     if (char_flags == 0 ) {
     lenbuf[0] = 0;
     ret = read_all(s, &lenbuf[1], 3);
     if (ret < 0) {
	 perror("reading token length");
	 return -1;
     } else if (ret != 3) {
	 if (display_file)
	     fprintf(display_file, 
		     "reading token length: %d of %d bytes read\n", 
		     ret, 3);
	 return -1;
     }
     }
     else {
       ret = read_all(s, lenbuf, 4);
       if (ret < 0) {
	 perror("reading token length");
	 return -1;
       } else if (ret != 4) {
	 if (display_file)
	   fprintf(display_file, 
		   "reading token length: %d of %d bytes read\n", 
		   ret, 4);
	 return -1;
       }
     }

     tok->length = ((lenbuf[0] << 24)
		    | (lenbuf[1] << 16)
		    | (lenbuf[2] << 8)
		    | lenbuf[3]);
     tok->value = (char *) malloc(tok->length ? tok->length : 1);
     if (tok->length && tok->value == NULL) {
	 if (display_file)
	     fprintf(display_file, 
		     "Out of memory allocating token data\n");
	  return -1;
     }

     ret = read_all(s, (char *) tok->value, tok->length);
     if (ret < 0) {
	  perror("reading token data");
	  free(tok->value);
	  return -1;
     } else if (ret != tok->length) {
	  fprintf(stderr, "sending token data: %d of %d bytes written\n", 
		  ret, (int) tok->length);
	  free(tok->value);
	  return -1;
     }

     return 0;
}

static void display_status_1(m, code, type)
     char *m;
     OM_uint32 code;
     int type;
{
     OM_uint32 maj_stat, min_stat;
     gss_buffer_desc msg;
     OM_uint32 msg_ctx;
     
     msg_ctx = 0;
     while (1) {
	  maj_stat = gss_display_status(&min_stat, code,
				       type, GSS_C_NULL_OID,
				       &msg_ctx, &msg);
	  if (display_file)
	      fprintf(display_file, "GSS-API error %s: %s\n", m,
		      (char *)msg.value); 
	  (void) gss_release_buffer(&min_stat, &msg);
	  
	  if (!msg_ctx)
	       break;
     }
}

/*
 * Function: display_status
 *
 * Purpose: displays GSS-API messages
 *
 * Arguments:
 *
 * 	msg		a string to be displayed with the message
 * 	maj_stat	the GSS-API major status code
 * 	min_stat	the GSS-API minor status code
 *
 * Effects:
 *
 * The GSS-API messages associated with maj_stat and min_stat are
 * displayed on stderr, each preceeded by "GSS-API error <msg>: " and
 * followed by a newline.
 */
void display_status(msg, maj_stat, min_stat)
     char *msg;
     OM_uint32 maj_stat;
     OM_uint32 min_stat;
{
     display_status_1(msg, maj_stat, GSS_C_GSS_CODE);
     display_status_1(msg, min_stat, GSS_C_MECH_CODE);
}

/*
 * Function: display_ctx_flags
 *
 * Purpose: displays the flags returned by context initation in
 *	    a human-readable form
 *
 * Arguments:
 *
 * 	int		ret_flags
 *
 * Effects:
 *
 * Strings corresponding to the context flags are printed on
 * stdout, preceded by "context flag: " and followed by a newline
 */

void display_ctx_flags(flags)
     OM_uint32 flags;
{
     if (flags & GSS_C_DELEG_FLAG)
	  fprintf(display_file, "context flag: GSS_C_DELEG_FLAG\n");
     if (flags & GSS_C_MUTUAL_FLAG)
	  fprintf(display_file, "context flag: GSS_C_MUTUAL_FLAG\n");
     if (flags & GSS_C_REPLAY_FLAG)
	  fprintf(display_file, "context flag: GSS_C_REPLAY_FLAG\n");
     if (flags & GSS_C_SEQUENCE_FLAG)
	  fprintf(display_file, "context flag: GSS_C_SEQUENCE_FLAG\n");
     if (flags & GSS_C_CONF_FLAG )
	  fprintf(display_file, "context flag: GSS_C_CONF_FLAG \n");
     if (flags & GSS_C_INTEG_FLAG )
	  fprintf(display_file, "context flag: GSS_C_INTEG_FLAG \n");
}

void print_token(tok)
     gss_buffer_t tok;
{
    int i;
    unsigned char *p = tok->value;

    if (!display_file)
	return;
    for (i=0; i < tok->length; i++, p++) {
	fprintf(display_file, "%02x ", *p);
	if ((i % 16) == 15) {
	    fprintf(display_file, "\n");
	}
    }
    fprintf(display_file, "\n");
    fflush(display_file);
}

#ifdef _WIN32
#include <sys\timeb.h>
#include <time.h>

int gettimeofday (struct timeval *tv, void *ignore_tz)
{
    struct _timeb tb;
    _tzset();
    _ftime(&tb);
    if (tv) {
	tv->tv_sec = tb.time;
	tv->tv_usec = tb.millitm * 1000;
    }
    return 0;
}
#endif /* _WIN32 */