groupaccess.c revision 126274
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" 26RCSID("$OpenBSD: groupaccess.c,v 1.6 2003/04/08 20:21:28 itojun Exp $"); 27 28#include "groupaccess.h" 29#include "xmalloc.h" 30#include "match.h" 31#include "log.h" 32 33static int ngroups; 34static char **groups_byname; 35 36/* 37 * Initialize group access list for user with primary (base) and 38 * supplementary groups. Return the number of groups in the list. 39 */ 40int 41ga_init(const char *user, gid_t base) 42{ 43 gid_t *groups_bygid; 44 int i, j; 45 struct group *gr; 46 47 if (ngroups > 0) 48 ga_free(); 49 50 ngroups = NGROUPS_MAX; 51#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) 52 ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); 53#endif 54 55 groups_bygid = xmalloc(ngroups * sizeof(*groups_bygid)); 56 groups_byname = xmalloc(ngroups * sizeof(*groups_byname)); 57 58 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) 59 logit("getgrouplist: groups list too small"); 60 for (i = 0, j = 0; i < ngroups; i++) 61 if ((gr = getgrgid(groups_bygid[i])) != NULL) 62 groups_byname[j++] = xstrdup(gr->gr_name); 63 xfree(groups_bygid); 64 return (ngroups = j); 65} 66 67/* 68 * Return 1 if one of user's groups is contained in groups. 69 * Return 0 otherwise. Use match_pattern() for string comparison. 70 */ 71int 72ga_match(char * const *groups, int n) 73{ 74 int i, j; 75 76 for (i = 0; i < ngroups; i++) 77 for (j = 0; j < n; j++) 78 if (match_pattern(groups_byname[i], groups[j])) 79 return 1; 80 return 0; 81} 82 83/* 84 * Free memory allocated for group access list. 85 */ 86void 87ga_free(void) 88{ 89 int i; 90 91 if (ngroups > 0) { 92 for (i = 0; i < ngroups; i++) 93 xfree(groups_byname[i]); 94 ngroups = 0; 95 xfree(groups_byname); 96 } 97} 98