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Annotation of embedaddon/sudo/compat/getgrouplist.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: #include <config.h>
                     18: 
                     19: #include <sys/types.h>
                     20: #include <stdio.h>
                     21: #ifdef STDC_HEADERS
                     22: # include <stdlib.h>
                     23: # include <stddef.h>
                     24: #else
                     25: # ifdef HAVE_STDLIB_H
                     26: #  include <stdlib.h>
                     27: # endif
                     28: #endif /* STDC_HEADERS */
                     29: #ifdef HAVE_STRING_H
                     30: # include <string.h>
                     31: #endif /* HAVE_STRING_H */
                     32: #ifdef HAVE_STRINGS_H
                     33: # include <strings.h>
                     34: #endif /* HAVE_STRINGS_H */
                     35: #include <grp.h>
                     36: 
                     37: #include "missing.h"
                     38: 
                     39: #ifdef HAVE_GETGRSET
                     40: /*
                     41:  * BSD-compatible getgrouplist(3) using getgrset(3)
                     42:  */
                     43: int
                     44: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
                     45: {
                     46:     char *cp, *grset = NULL;
                     47:     int i, ngroups = 1;
                     48:     int grpsize = *ngroupsp;
                     49:     int rval = -1;
                     50:     gid_t gid;
                     51: 
                     52:     /* We support BSD semantics where the first element is the base gid */
                     53:     if (grpsize <= 0)
                     54:        return -1;
                     55:     groups[0] = basegid;
                     56: 
                     57: #ifdef HAVE_SETAUTHDB
                     58:     aix_setauthdb((char *) name);
                     59: #endif
                     60:     if ((grset = getgrset(name)) != NULL) {
                     61:        for (cp = strtok(grset, ","); cp != NULL; cp = strtok(NULL, ",")) {
                     62:            gid = atoi(cp);
                     63:            if (gid != basegid) {
                     64:                if (ngroups == grpsize)
                     65:                    goto done;
                     66:                groups[ngroups++] = gid;
                     67:            }
                     68:        }
                     69:     }
                     70:     rval = 0;
                     71: 
                     72: done:
                     73:     efree(grset);
                     74: #ifdef HAVE_SETAUTHDB
                     75:     aix_restoreauthdb();
                     76: #endif
                     77:     *ngroupsp = ngroups;
                     78: 
                     79:     return rval;
                     80: }
                     81: 
                     82: #else /* HAVE_GETGRSET */
                     83: 
                     84: /*
                     85:  * BSD-compatible getgrouplist(3) using getgrent(3)
                     86:  */
                     87: int
                     88: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
                     89: {
                     90:     int i, ngroups = 1;
                     91:     int grpsize = *ngroupsp;
                     92:     int rval = -1;
                     93:     struct group *grp;
                     94: 
                     95:     /* We support BSD semantics where the first element is the base gid */
                     96:     if (grpsize <= 0)
                     97:        return -1;
                     98:     groups[0] = basegid;
                     99: 
                    100:     setgrent();
                    101:     while ((grp = getgrent()) != NULL) {
                    102:        if (grp->gr_gid == basegid)
                    103:            continue;
                    104: 
                    105:        for (i = 0; grp->gr_mem[i] != NULL; i++) {
                    106:            if (strcmp(name, grp->gr_mem[i]) == 0)
                    107:                break;
                    108:        }
                    109:        if (grp->gr_mem[i] == NULL)
                    110:            continue; /* user not found */
                    111: 
                    112:        /* Only add if it is not the same as an existing gid */
                    113:        for (i = 0; i < ngroups; i++) {
                    114:            if (grp->gr_gid == groups[i])
                    115:                break;
                    116:        }
                    117:        if (i == ngroups) {
                    118:            if (ngroups == grpsize)
                    119:                goto done;
                    120:            groups[ngroups++] = grp->gr_gid;
                    121:        }
                    122:     }
                    123:     rval = 0;
                    124: 
                    125: done:
                    126:     endgrent();
                    127:     *ngroupsp = ngroups;
                    128: 
                    129:     return rval;
                    130: }
                    131: #endif /* HAVE_GETGRSET */