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