1 /* 2 * Copyright (c) 2001 Kevin Steves. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include "includes.h" 26 RCSID("$OpenBSD: groupaccess.c,v 1.5 2002/03/04 17:27:39 stevesk Exp $"); 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #include "groupaccess.h" 31 #include "xmalloc.h" 32 #include "match.h" 33 #include "log.h" 34 35 static int ngroups; 36 static char *groups_byname[NGROUPS_MAX + 1]; /* +1 for base/primary group */ 37 38 /* 39 * Initialize group access list for user with primary (base) and 40 * supplementary groups. Return the number of groups in the list. 41 */ 42 int 43 ga_init(const char *user, gid_t base) 44 { 45 gid_t groups_bygid[NGROUPS_MAX + 1]; 46 int i, j; 47 struct group *gr; 48 49 if (ngroups > 0) 50 ga_free(); 51 52 ngroups = sizeof(groups_bygid) / sizeof(gid_t); 53 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) 54 log("getgrouplist: groups list too small"); 55 for (i = 0, j = 0; i < ngroups; i++) 56 if ((gr = getgrgid(groups_bygid[i])) != NULL) 57 groups_byname[j++] = xstrdup(gr->gr_name); 58 return (ngroups = j); 59 } 60 61 /* 62 * Return 1 if one of user's groups is contained in groups. 63 * Return 0 otherwise. Use match_pattern() for string comparison. 64 */ 65 int 66 ga_match(char * const *groups, int n) 67 { 68 int i, j; 69 70 for (i = 0; i < ngroups; i++) 71 for (j = 0; j < n; j++) 72 if (match_pattern(groups_byname[i], groups[j])) 73 return 1; 74 return 0; 75 } 76 77 /* 78 * Free memory allocated for group access list. 79 */ 80 void 81 ga_free(void) 82 { 83 int i; 84 85 if (ngroups > 0) { 86 for (i = 0; i < ngroups; i++) 87 xfree(groups_byname[i]); 88 ngroups = 0; 89 } 90 } 91