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Annotation of src/usr.bin/ssh/groupaccess.c, Revision 1.7

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