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Annotation of src/usr.bin/ssh/groupaccess.c, Revision 1.16

1.16    ! djm         1: /* $OpenBSD: groupaccess.c,v 1.15 2015/01/20 23:14:00 deraadt Exp $ */
1.1       markus      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:
1.9       stevesk    26: #include <sys/types.h>
                     27:
                     28: #include <grp.h>
1.10      stevesk    29: #include <unistd.h>
1.12      deraadt    30: #include <stdarg.h>
1.14      djm        31: #include <stdlib.h>
1.13      djm        32: #include <string.h>
1.15      deraadt    33: #include <limits.h>
1.1       markus     34:
1.12      deraadt    35: #include "xmalloc.h"
1.1       markus     36: #include "groupaccess.h"
                     37: #include "match.h"
1.2       markus     38: #include "log.h"
1.1       markus     39:
                     40: static int ngroups;
                     41: static char *groups_byname[NGROUPS_MAX + 1];   /* +1 for base/primary group */
                     42:
1.4       markus     43: /*
                     44:  * Initialize group access list for user with primary (base) and
                     45:  * supplementary groups.  Return the number of groups in the list.
                     46:  */
1.1       markus     47: int
                     48: ga_init(const char *user, gid_t base)
                     49: {
                     50:        gid_t groups_bygid[NGROUPS_MAX + 1];
                     51:        int i, j;
                     52:        struct group *gr;
                     53:
                     54:        if (ngroups > 0)
                     55:                ga_free();
                     56:
                     57:        ngroups = sizeof(groups_bygid) / sizeof(gid_t);
                     58:        if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
1.6       itojun     59:                logit("getgrouplist: groups list too small");
1.1       markus     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:        return (ngroups = j);
                     64: }
                     65:
1.4       markus     66: /*
                     67:  * Return 1 if one of user's groups is contained in groups.
                     68:  * Return 0 otherwise.  Use match_pattern() for string comparison.
                     69:  */
1.1       markus     70: int
                     71: ga_match(char * const *groups, int n)
                     72: {
                     73:        int i, j;
                     74:
                     75:        for (i = 0; i < ngroups; i++)
                     76:                for (j = 0; j < n; j++)
                     77:                        if (match_pattern(groups_byname[i], groups[j]))
                     78:                                return 1;
                     79:        return 0;
1.13      djm        80: }
                     81:
                     82: /*
                     83:  * Return 1 if one of user's groups matches group_pattern list.
                     84:  * Return 0 on negated or no match.
                     85:  */
                     86: int
                     87: ga_match_pattern_list(const char *group_pattern)
                     88: {
                     89:        int i, found = 0;
                     90:
                     91:        for (i = 0; i < ngroups; i++) {
1.16    ! djm        92:                switch (match_pattern_list(groups_byname[i], group_pattern, 0)) {
1.13      djm        93:                case -1:
                     94:                        return 0;       /* Negated match wins */
                     95:                case 0:
                     96:                        continue;
                     97:                case 1:
                     98:                        found = 1;
                     99:                }
                    100:        }
                    101:        return found;
1.1       markus    102: }
                    103:
1.4       markus    104: /*
                    105:  * Free memory allocated for group access list.
                    106:  */
1.1       markus    107: void
                    108: ga_free(void)
                    109: {
                    110:        int i;
                    111:
                    112:        if (ngroups > 0) {
                    113:                for (i = 0; i < ngroups; i++)
1.14      djm       114:                        free(groups_byname[i]);
1.1       markus    115:                ngroups = 0;
                    116:        }
                    117: }