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