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Annotation of src/usr.bin/ssh/groupaccess.c, Revision 1.13

1.13    ! djm         1: /* $OpenBSD: groupaccess.c,v 1.12 2006/08/03 03:34:42 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>
1.11      stevesk    27: #include <sys/param.h>
1.9       stevesk    28:
                     29: #include <grp.h>
1.10      stevesk    30: #include <unistd.h>
1.12      deraadt    31: #include <stdarg.h>
1.13    ! djm        32: #include <string.h>
1.1       markus     33:
1.12      deraadt    34: #include "xmalloc.h"
1.1       markus     35: #include "groupaccess.h"
                     36: #include "match.h"
1.2       markus     37: #include "log.h"
1.1       markus     38:
                     39: static int ngroups;
                     40: static char *groups_byname[NGROUPS_MAX + 1];   /* +1 for base/primary group */
                     41:
1.4       markus     42: /*
                     43:  * Initialize group access list for user with primary (base) and
                     44:  * supplementary groups.  Return the number of groups in the list.
                     45:  */
1.1       markus     46: int
                     47: ga_init(const char *user, gid_t base)
                     48: {
                     49:        gid_t groups_bygid[NGROUPS_MAX + 1];
                     50:        int i, j;
                     51:        struct group *gr;
                     52:
                     53:        if (ngroups > 0)
                     54:                ga_free();
                     55:
                     56:        ngroups = sizeof(groups_bygid) / sizeof(gid_t);
                     57:        if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
1.6       itojun     58:                logit("getgrouplist: groups list too small");
1.1       markus     59:        for (i = 0, j = 0; i < ngroups; i++)
                     60:                if ((gr = getgrgid(groups_bygid[i])) != NULL)
                     61:                        groups_byname[j++] = xstrdup(gr->gr_name);
                     62:        return (ngroups = j);
                     63: }
                     64:
1.4       markus     65: /*
                     66:  * Return 1 if one of user's groups is contained in groups.
                     67:  * Return 0 otherwise.  Use match_pattern() for string comparison.
                     68:  */
1.1       markus     69: int
                     70: ga_match(char * const *groups, int n)
                     71: {
                     72:        int i, j;
                     73:
                     74:        for (i = 0; i < ngroups; i++)
                     75:                for (j = 0; j < n; j++)
                     76:                        if (match_pattern(groups_byname[i], groups[j]))
                     77:                                return 1;
                     78:        return 0;
1.13    ! djm        79: }
        !            80:
        !            81: /*
        !            82:  * Return 1 if one of user's groups matches group_pattern list.
        !            83:  * Return 0 on negated or no match.
        !            84:  */
        !            85: int
        !            86: ga_match_pattern_list(const char *group_pattern)
        !            87: {
        !            88:        int i, found = 0;
        !            89:        size_t len = strlen(group_pattern);
        !            90:
        !            91:        for (i = 0; i < ngroups; i++) {
        !            92:                switch (match_pattern_list(groups_byname[i],
        !            93:                    group_pattern, len, 0)) {
        !            94:                case -1:
        !            95:                        return 0;       /* Negated match wins */
        !            96:                case 0:
        !            97:                        continue;
        !            98:                case 1:
        !            99:                        found = 1;
        !           100:                }
        !           101:        }
        !           102:        return found;
1.1       markus    103: }
                    104:
1.4       markus    105: /*
                    106:  * Free memory allocated for group access list.
                    107:  */
1.1       markus    108: void
                    109: ga_free(void)
                    110: {
                    111:        int i;
                    112:
                    113:        if (ngroups > 0) {
                    114:                for (i = 0; i < ngroups; i++)
                    115:                        xfree(groups_byname[i]);
                    116:                ngroups = 0;
                    117:        }
                    118: }