1 /**************************************************************************** 2 * Copyright (c) 1998,2000 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Thomas E. Dickey <dickey@clark.net> 1998,2000 * 31 ****************************************************************************/ 32 33 #include <curses.priv.h> 34 #include <tic.h> 35 36 MODULE_ID("$Id: access.c,v 1.4 2000/10/08 01:25:06 tom Exp $") 37 38 char * 39 _nc_basename(char *path) 40 { 41 char *result = strrchr(path, '/'); 42 #ifdef __EMX__ 43 if (result == 0) 44 result = strrchr(path, '\\'); 45 #endif 46 if (result == 0) 47 result = path; 48 else 49 result++; 50 return result; 51 } 52 53 int 54 _nc_access(const char *path, int mode) 55 { 56 if (access(path, mode) < 0) { 57 if ((mode & W_OK) != 0 58 && errno == ENOENT 59 && strlen(path) < PATH_MAX) { 60 char head[PATH_MAX]; 61 char *leaf = _nc_basename(strcpy(head, path)); 62 63 if (leaf == 0) 64 leaf = head; 65 *leaf = '\0'; 66 if (head == leaf) 67 (void) strcpy(head, "."); 68 69 return access(head, R_OK | W_OK | X_OK); 70 } 71 return -1; 72 } 73 return 0; 74 } 75 76 #ifndef USE_ROOT_ENVIRON 77 /* 78 * Returns true if we allow application to use environment variables that are 79 * used for searching lists of directories, etc. 80 */ 81 int 82 _nc_env_access(void) 83 { 84 #if HAVE_ISSETUGID 85 if (issetugid()) 86 return FALSE; 87 #elif HAVE_GETEUID && HAVE_GETEGID 88 if (getuid() != geteuid() 89 || getgid() != getegid()) 90 return FALSE; 91 #endif 92 return getuid() != 0; /* ...finally, disallow root */ 93 } 94 #endif 95