xref: /xsrc/external/mit/libICE/dist/src/getauth.c

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


Copyright 1993, 1998  The Open Group

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Author: Ralph Mor, X Consortium
******************************************************************************/

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

    entry = IceGetAuthFileEntry (protocolName, networkId, authName);

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

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

    IceFreeAuthFileEntry (entry);
}



void
_IceGetPaAuthData (
	const char	*protocolName,
	const char	*networkId,
	const 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 = malloc (entry->auth_data_length)) != NULL)
	    memcpy (*authDataRet, entry->auth_data, entry->auth_data_length);
    }
    else
    {
	*authDataLenRet = 0;
	*authDataRet = NULL;
    }
}



void
_IceGetPoValidAuthIndices (
	const char	*protocol_name,
	const char	*network_id,
	int		num_auth_names,
	const 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" FOPEN_CLOEXEC)))
	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 (
	const char	*protocol_name,
	const char	*network_id,
	int		num_auth_names,
	const 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,
	    const 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);
}