dist/src/getauth.c

/* $Xorg: getauth.c,v 1.4 2001/02/09 02:03:26 xorgcvs Exp $ */
/******************************************************************************


Copyright 1993, 1998  The Open Group

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 appear in all copies and that both that
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all copies or substantial portions of the Software.

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in this Software without prior written authorization from The Open Group.

Author: Ralph Mor, X Consortium
******************************************************************************/
/* $XFree86: xc/lib/ICE/getauth.c,v 1.2 2001/10/28 03:32:28 tsi Exp $ */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <X11/ICE/ICElib.h>
#include "ICElibint.h"

static Bool auth_valid (const char *auth_name, int num_auth_names,
			char **auth_names, int *index_ret);


/*
 * The functions in this file are not a standard part of ICElib.
 *
 * The sample implementation uses an .ICEauthority to manipulate
 * authentication data.
 *
 * For the client that initiates a Protocol Setup, we look in the
 * .ICEauthority file to get the data.
 *
 * For the client accepting the Protocol Setup, we get the data
 * from an in-memory database of authentication data (set by the
 * application calling IceSetPaAuthData).  We have to get the data
 * from memory because getting it directly from the .ICEauthority
 * file is not secure - someone can just modify the contents of the
 * .ICEauthority file behind our back.
 */

void
_IceGetPoAuthData (
	char		*protocolName,
	char		*networkId,
	char		*authName,
	unsigned short	*authDataLenRet,
	char		**authDataRet
)
{
    IceAuthFileEntry    *entry;

    entry = IceGetAuthFileEntry (protocolName, networkId, authName);

    if (entry)
    {
	*authDataLenRet = entry->auth_data_length;

	if ((*authDataRet = (char *) malloc (entry->auth_data_length)) != NULL)
	    memcpy (*authDataRet, entry->auth_data, entry->auth_data_length);
    }
    else
    {
	*authDataLenRet = 0;
	*authDataRet = NULL;
    }

    IceFreeAuthFileEntry (entry);
}


void
_IceGetPaAuthData (
	char		*protocolName,
	char		*networkId,
	char		*authName,
	unsigned short	*authDataLenRet,
	char		**authDataRet
)
{
    IceAuthDataEntry	*entry = NULL;
    int			found = 0;
    int			i;

    for (i = 0; i < _IcePaAuthDataEntryCount && !found; i++)
    {
	entry = &_IcePaAuthDataEntries[i];

	found =
	    strcmp (protocolName, entry->protocol_name) == 0 &&
            strcmp (networkId, entry->network_id) == 0 &&
            strcmp (authName, entry->auth_name) == 0;
    }

    if (found)
    {
	*authDataLenRet = entry->auth_data_length;

	if ((*authDataRet = (char *) malloc (entry->auth_data_length)) != NULL)
	    memcpy (*authDataRet, entry->auth_data, entry->auth_data_length);
    }
    else
    {
	*authDataLenRet = 0;
	*authDataRet = NULL;
    }
}


void
_IceGetPoValidAuthIndices (
	char	*protocol_name,
	char	*network_id,
	int	num_auth_names,
	char	**auth_names,
	int	*num_indices_ret,
	int	*indices_ret		/* in/out arg */
)
{
    FILE    		*auth_file;
    char    		*filename;
    IceAuthFileEntry    *entry;
    int			index_ret, i;

    *num_indices_ret = 0;

    if (!(filename = IceAuthFileName ()))
	return;

    if (access (filename, R_OK) != 0)		/* checks REAL id */
	return;

    if (!(auth_file = fopen (filename, "rb")))
	return;

    for (;;)
    {
	if (!(entry = IceReadAuthFileEntry (auth_file)))
	    break;

	if (strcmp (protocol_name, entry->protocol_name) == 0 &&
	    strcmp (network_id, entry->network_id) == 0 &&
	    auth_valid (entry->auth_name, num_auth_names,
	    auth_names, &index_ret))
	{
	    /*
	     * Make sure we didn't store this index already.
	     */

	    for (i = 0; i < *num_indices_ret; i++)
		if (index_ret == indices_ret[i])
		    break;

	    if (i >= *num_indices_ret)
	    {
		indices_ret[*num_indices_ret] = index_ret;
		*num_indices_ret += 1;
	    }
	}

	IceFreeAuthFileEntry (entry);
    }

    fclose (auth_file);
}


void
_IceGetPaValidAuthIndices (
	char	*protocol_name,
	char	*network_id,
	int	num_auth_names,
	char	**auth_names,
	int	*num_indices_ret,
	int	*indices_ret		/* in/out arg */
)
{
    int			index_ret;
    int			i, j;
    IceAuthDataEntry	*entry;

    *num_indices_ret = 0;

    for (i = 0;	i < _IcePaAuthDataEntryCount; i++)
    {
	entry = &_IcePaAuthDataEntries[i];

	if (strcmp (protocol_name, entry->protocol_name) == 0 &&
            strcmp (network_id, entry->network_id) == 0 &&
	    auth_valid (entry->auth_name, num_auth_names,
	    auth_names, &index_ret))
	{
	    /*
	     * Make sure we didn't store this index already.
	     */

	    for (j = 0; j < *num_indices_ret; j++)
		if (index_ret == indices_ret[j])
		    break;

	    if (j >= *num_indices_ret)
	    {
		indices_ret[*num_indices_ret] = index_ret;
		*num_indices_ret += 1;
	    }
	}
    }
}


/*
 * local routines
 */

static Bool
auth_valid (const char *auth_name, int num_auth_names,
	    char **auth_names, int *index_ret)

{
    /*
     * Check if auth_name is in auth_names.  Return index.
     */

    int i;

    for (i = 0; i < num_auth_names; i++)
	if (strcmp (auth_name, auth_names[i]) == 0)
	{
	    break;
	}

    if (i < num_auth_names)
    {
	*index_ret = i;
	return (1);
    }
    else
	return (0);
}