Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 1 | /* $OpenBSD: groupaccess.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */ |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 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 | |
Damien Miller | 427a1d5 | 2006-07-10 20:20:33 +1000 | [diff] [blame] | 28 | #include <sys/types.h> |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 29 | #include <sys/param.h> |
Damien Miller | 427a1d5 | 2006-07-10 20:20:33 +1000 | [diff] [blame] | 30 | |
| 31 | #include <grp.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 32 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 33 | #include <stdarg.h> |
Damien Miller | 427a1d5 | 2006-07-10 20:20:33 +1000 | [diff] [blame] | 34 | |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 35 | #include "xmalloc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 36 | #include "groupaccess.h" |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 37 | #include "match.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 38 | #include "log.h" |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 39 | |
| 40 | static int ngroups; |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 41 | static char **groups_byname; |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 42 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 43 | /* |
| 44 | * Initialize group access list for user with primary (base) and |
| 45 | * supplementary groups. Return the number of groups in the list. |
| 46 | */ |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 47 | int |
| 48 | ga_init(const char *user, gid_t base) |
| 49 | { |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 50 | gid_t *groups_bygid; |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 51 | int i, j; |
| 52 | struct group *gr; |
| 53 | |
| 54 | if (ngroups > 0) |
| 55 | ga_free(); |
| 56 | |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 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 | |
Darren Tucker | d8093e4 | 2006-05-04 16:24:34 +1000 | [diff] [blame] | 62 | groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); |
| 63 | groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 64 | |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 65 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 66 | logit("getgrouplist: groups list too small"); |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 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); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 70 | xfree(groups_bygid); |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 71 | return (ngroups = j); |
| 72 | } |
| 73 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 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 | */ |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 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 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 90 | /* |
| 91 | * Free memory allocated for group access list. |
| 92 | */ |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 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; |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 102 | xfree(groups_byname); |
Kevin Steves | 886b06c | 2001-01-14 00:35:19 +0000 | [diff] [blame] | 103 | } |
| 104 | } |