1 /* $OpenBSD: groupaccess.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */ 2 /* 3 * Copyright (c) 2001 Kevin Steves. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 31 #include <grp.h> 32 #include <unistd.h> 33 #include <stdarg.h> 34 35 #include "xmalloc.h" 36 #include "groupaccess.h" 37 #include "match.h" 38 #include "log.h" 39 40 static int ngroups; 41 static char **groups_byname; 42 43 /* 44 * Initialize group access list for user with primary (base) and 45 * supplementary groups. Return the number of groups in the list. 46 */ 47 int 48 ga_init(const char *user, gid_t base) 49 { 50 gid_t *groups_bygid; 51 int i, j; 52 struct group *gr; 53 54 if (ngroups > 0) 55 ga_free(); 56 57 ngroups = NGROUPS_MAX; 58 #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) 59 ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); 60 #endif 61 62 groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); 63 groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); 64 65 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) 66 logit("getgrouplist: groups list too small"); 67 for (i = 0, j = 0; i < ngroups; i++) 68 if ((gr = getgrgid(groups_bygid[i])) != NULL) 69 groups_byname[j++] = xstrdup(gr->gr_name); 70 xfree(groups_bygid); 71 return (ngroups = j); 72 } 73 74 /* 75 * Return 1 if one of user's groups is contained in groups. 76 * Return 0 otherwise. Use match_pattern() for string comparison. 77 */ 78 int 79 ga_match(char * const *groups, int n) 80 { 81 int i, j; 82 83 for (i = 0; i < ngroups; i++) 84 for (j = 0; j < n; j++) 85 if (match_pattern(groups_byname[i], groups[j])) 86 return 1; 87 return 0; 88 } 89 90 /* 91 * Free memory allocated for group access list. 92 */ 93 void 94 ga_free(void) 95 { 96 int i; 97 98 if (ngroups > 0) { 99 for (i = 0; i < ngroups; i++) 100 xfree(groups_byname[i]); 101 ngroups = 0; 102 xfree(groups_byname); 103 } 104 } 105