1 /*

     2  * Trusted xscreensaver

     3  *

     4  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.

     5  *

     6  * Permission is hereby granted, free of charge, to any person obtaining a

     7  * copy of this software and associated documentation files (the

     8  * "Software"), to deal in the Software without restriction, including

     9  * without limitation the rights to use, copy, modify, merge, publish,

    10  * distribute, and/or sell copies of the Software, and to permit persons

    11  * to whom the Software is furnished to do so, provided that the above

    12  * copyright notice(s) and this permission notice appear in all copies of

    13  * the Software and that both the above copyright notice(s) and this

    14  * permission notice appear in supporting documentation.

    15  *

    16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

    17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT

    19  * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR

    20  * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL

    21  * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING

    22  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,

    23  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION

    24  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

    25  *

    26  * Except as contained in this notice, the name of a copyright holder

    27  * shall not be used in advertising or otherwise to promote the sale, use

    28  * or other dealings in this Software without prior written authorization

    29  * of the copyright holder.

    30  *

    31  *

    32  *

    33  * Based on work by Erwann Chenede, Ghee Teo

    34  *

    35  * Used to check if we are in a multilabel session and to load

    36  * additional functionality within the multilabel session.

    37  */

    38 

    39 #include <dlfcn.h>

    40 #include <link.h>

    41 #include <stdlib.h>

    42 #include <user_attr.h>

    43 #include <sys/types.h>

    44 #include <unistd.h>

    45 #include <strings.h>

    46 

    47 #include "trusted-utils.h"

    48 

    49 /* 

    50  * Checks for Multi label session 

    51  */

    52 gboolean

    53 tsol_is_multi_label_session (void)

    54 {

    55        static char *session = NULL;

    56 

    57        if (!session)

    58                session = (char *)getenv("TRUSTED_SESSION");

    59 

    60        if (!session)

    61                return FALSE;

    62 

    63        return TRUE;

    64 }

    65 

    66 /*

    67  * dynamicly load the libxtsol library

    68  */

    69 static

    70 void * dlopen_xtsol (void)

    71 {

    72    void  *handle = NULL;

    73 

    74    if ((handle = dlopen ("/usr/lib/libXtsol.so.1", RTLD_LAZY)) != NULL)

    75        return handle;

    76    if ((handle = dlopen ("/usr/openwin/lib/libXtsol.so.1", RTLD_LAZY)) != NULL)

    77        return handle;

    78 

    79    return handle;

    80 }

    81 

    82 /*

    83  * dynamicly load the libDtTsol library

    84  */

    85 static

    86 void * dlopen_gnometsol (void)

    87 {

    88    void  *handle = NULL;

    89 

    90    if ((handle = dlopen ("/usr/lib/libgnometsol.so.1", RTLD_LAZY)) != NULL)

    91        return handle;

    92 

    93    return handle;

    94 }

    95 

    96 xtsol_XTSOLgetWorkstationOwner      libxtsol_XTSOLgetWorkstationOwner = NULL;

    97 

    98 void

    99 XTSOLgetWorkstationOwner(Display *dpy, uid_t *WorkstationOwner)

   100 {

   101   static gpointer xtsol_handle = NULL;

   102   static gboolean _xtsol_initialized = FALSE;

   103 

   104   if ( ! _xtsol_initialized ) {

   105     _xtsol_initialized = TRUE;

   106     xtsol_handle = dlopen_xtsol ();

   107     if (xtsol_handle != NULL)

   108       libxtsol_XTSOLgetWorkstationOwner = (xtsol_XTSOLgetWorkstationOwner) dlsym(xtsol_handle,

   109 					     "XTSOLgetWorkstationOwner");

   110   }

   111 

   112   if (libxtsol_XTSOLgetWorkstationOwner == NULL) {

   113     *WorkstationOwner = getuid();

   114   } else

   115     libxtsol_XTSOLgetWorkstationOwner(dpy, WorkstationOwner);

   116 }

   117 

   118 gnome_tsol_get_usrattr_val		libgnome_tsol_get_usrattr_val = NULL;

   119 

   120 /*

   121  * Returns a value from uattr for the given key.

   122  * If there is no value in user_attr, then it returns the

   123  * system wide default from policy.conf or labelencodings

   124  * as appropriate.

   125  */

   126 char *

   127 getusrattrval(userattr_t *uattr, char *keywd)

   128 {

   129   static gpointer gnometsol_handle = NULL;

   130   static gboolean _gnometsol_initialized = FALSE;

   131   char *value;

   132 

   133   if ( ! _gnometsol_initialized ) {

   134     _gnometsol_initialized = TRUE;

   135     gnometsol_handle = dlopen_gnometsol ();

   136     if (gnometsol_handle != NULL)

   137       libgnome_tsol_get_usrattr_val = (gnome_tsol_get_usrattr_val) dlsym(gnometsol_handle,

   138 					     "gnome_tsol_get_usrattr_val");

   139   }

   140 

   141   if (libgnome_tsol_get_usrattr_val == NULL) {

   142     if (strcmp(keywd, USERATTR_IDLETIME_KW) == 0)

   143       value = strdup("15");

   144     else if (strcmp(keywd, USERATTR_IDLECMD_KW) == 0)

   145       value = strdup(USERATTR_IDLECMD_LOCK_KW);

   146   } else

   147     value = libgnome_tsol_get_usrattr_val(uattr, keywd);

   148   

   149   return ( value );

   150 }