1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 29 /* All Rights Reserved */ 30 31 #include "mt.h" 32 #include "uucp.h" 33 34 /* copy str into data space -- caller should report errors. */ 35 36 static char * 37 strsave(const char *str) 38 { 39 char *rval; 40 41 rval = malloc(strlen(str) + 1); 42 if (rval != 0) 43 (void) strcpy(rval, str); 44 return (rval); 45 } 46 47 /* 48 * Determine if the effective user id has the appropriate permission 49 * on a file. Modeled after access(2). 50 * amode: 51 * 00 just checks for file existence. 52 * 04 checks read permission. 53 * 02 checks write permission. 54 * 01 checks execute/search permission. 55 * other bits are ignored quietly. 56 */ 57 58 static int 59 eaccess(char *path, mode_t amode) 60 { 61 struct stat s; 62 uid_t euid; 63 64 if (stat(path, &s) == -1) 65 return (-1); /* can't stat file */ 66 amode &= 07; 67 68 if ((euid = geteuid()) == 0) /* root can do all */ 69 return (0); 70 if (euid == s.st_uid) 71 s.st_mode >>= 6; /* use owner bits */ 72 else if (getegid() == s.st_gid) 73 s.st_mode >>= 3; /* use group bits */ 74 75 if ((amode & s.st_mode) == amode) 76 return (0); /* access permitted */ 77 errno = EACCES; 78 return (-1); 79 } 80