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Annotation of src/usr.bin/ssh/groupaccess.c, Revision 1.10

1.10    ! stevesk     1: /* $OpenBSD: groupaccess.c,v 1.9 2006/07/02 22:45:59 stevesk 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:
                     26: #include "includes.h"
1.9       stevesk    27:
                     28: #include <sys/types.h>
                     29:
                     30: #include <grp.h>
1.10    ! stevesk    31: #include <unistd.h>
1.1       markus     32:
                     33: #include "groupaccess.h"
                     34: #include "xmalloc.h"
                     35: #include "match.h"
1.2       markus     36: #include "log.h"
1.1       markus     37:
                     38: static int ngroups;
                     39: static char *groups_byname[NGROUPS_MAX + 1];   /* +1 for base/primary group */
                     40:
1.4       markus     41: /*
                     42:  * Initialize group access list for user with primary (base) and
                     43:  * supplementary groups.  Return the number of groups in the list.
                     44:  */
1.1       markus     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)
1.6       itojun     57:                logit("getgrouplist: groups list too small");
1.1       markus     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:
1.4       markus     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:  */
1.1       markus     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:
1.4       markus     80: /*
                     81:  * Free memory allocated for group access list.
                     82:  */
1.1       markus     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: }