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234 lines
6.8 KiB
C
234 lines
6.8 KiB
C
/* Copyright (C) 1989,1991,1993,1996-2006,2008,2010,2011
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <assert.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <nsswitch.h>
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#include "../nscd/nscd-client.h"
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#include "../nscd/nscd_proto.h"
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/* Type of the lookup function. */
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typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
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long int *, long int *,
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gid_t **, long int, int *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_group_lookup (service_user **nip, const char *name,
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void **fctp);
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extern void *__nss_lookup_function (service_user *ni, const char *fct_name);
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extern service_user *__nss_group_database attribute_hidden;
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service_user *__nss_initgroups_database;
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static bool use_initgroups_entry;
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#include "compat-initgroups.c"
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static int
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internal_getgrouplist (const char *user, gid_t group, long int *size,
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gid_t **groupsp, long int limit)
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{
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#ifdef USE_NSCD
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if (__nss_not_use_nscd_group > 0
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&& ++__nss_not_use_nscd_group > NSS_NSCD_RETRY)
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__nss_not_use_nscd_group = 0;
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if (!__nss_not_use_nscd_group
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&& !__nss_database_custom[NSS_DBSIDX_group])
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{
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int n = __nscd_getgrouplist (user, group, size, groupsp, limit);
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if (n >= 0)
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return n;
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/* nscd is not usable. */
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__nss_not_use_nscd_group = 1;
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}
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#endif
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enum nss_status status = NSS_STATUS_UNAVAIL;
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int no_more = 0;
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/* Never store more than the starting *SIZE number of elements. */
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assert (*size > 0);
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(*groupsp)[0] = group;
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/* Start is one, because we have the first group as parameter. */
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long int start = 1;
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if (__nss_initgroups_database == NULL)
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{
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if (__nss_database_lookup ("initgroups", NULL, "",
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&__nss_initgroups_database) < 0)
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{
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if (__nss_group_database == NULL)
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no_more = __nss_database_lookup ("group", NULL, "compat files",
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&__nss_group_database);
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__nss_initgroups_database = __nss_group_database;
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}
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else
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use_initgroups_entry = true;
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}
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else
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/* __nss_initgroups_database might have been set through
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__nss_configure_lookup in which case use_initgroups_entry was
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not set here. */
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use_initgroups_entry = __nss_initgroups_database != __nss_group_database;
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service_user *nip = __nss_initgroups_database;
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while (! no_more)
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{
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long int prev_start = start;
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initgroups_dyn_function fct = __nss_lookup_function (nip,
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"initgroups_dyn");
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if (fct == NULL)
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status = compat_call (nip, user, group, &start, size, groupsp,
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limit, &errno);
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else
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status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp,
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limit, &errno));
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/* Remove duplicates. */
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long int cnt = prev_start;
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while (cnt < start)
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{
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long int inner;
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for (inner = 0; inner < prev_start; ++inner)
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if ((*groupsp)[inner] == (*groupsp)[cnt])
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break;
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if (inner < prev_start)
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(*groupsp)[cnt] = (*groupsp)[--start];
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else
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++cnt;
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}
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/* This is really only for debugging. */
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if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
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__libc_fatal ("illegal status in internal_getgrouplist");
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/* For compatibility reason we will continue to look for more
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entries using the next service even though data has already
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been found if the nsswitch.conf file contained only a 'groups'
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line and no 'initgroups' line. If the latter is available
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we always respect the status. This means that the default
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for successful lookups is to return. */
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if ((use_initgroups_entry || status != NSS_STATUS_SUCCESS)
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&& nss_next_action (nip, status) == NSS_ACTION_RETURN)
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break;
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if (nip->next == NULL)
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no_more = -1;
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else
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nip = nip->next;
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}
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return start;
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}
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/* Store at most *NGROUPS members of the group set for USER into
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*GROUPS. Also include GROUP. The actual number of groups found is
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returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
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int
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getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
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{
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long int size = MAX (1, *ngroups);
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gid_t *newgroups = (gid_t *) malloc (size * sizeof (gid_t));
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if (__builtin_expect (newgroups == NULL, 0))
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/* No more memory. */
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// XXX This is wrong. The user provided memory, we have to use
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// XXX it. The internal functions must be called with the user
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// XXX provided buffer and not try to increase the size if it is
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// XXX too small. For initgroups a flag could say: increase size.
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return -1;
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int total = internal_getgrouplist (user, group, &size, &newgroups, -1);
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memcpy (groups, newgroups, MIN (*ngroups, total) * sizeof (gid_t));
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free (newgroups);
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int retval = total > *ngroups ? -1 : total;
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*ngroups = total;
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return retval;
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}
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static_link_warning (getgrouplist)
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/* Initialize the group set for the current user
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by reading the group database and using all groups
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of which USER is a member. Also include GROUP. */
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int
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initgroups (const char *user, gid_t group)
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{
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#if defined NGROUPS_MAX && NGROUPS_MAX == 0
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/* No extra groups allowed. */
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return 0;
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#else
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long int size;
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gid_t *groups;
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int ngroups;
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int result;
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/* We always use sysconf even if NGROUPS_MAX is defined. That way, the
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limit can be raised in the kernel configuration without having to
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recompile libc. */
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long int limit = __sysconf (_SC_NGROUPS_MAX);
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if (limit > 0)
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/* We limit the size of the intially allocated array. */
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size = MIN (limit, 64);
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else
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/* No fixed limit on groups. Pick a starting buffer size. */
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size = 16;
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groups = (gid_t *) malloc (size * sizeof (gid_t));
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if (__builtin_expect (groups == NULL, 0))
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/* No more memory. */
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return -1;
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ngroups = internal_getgrouplist (user, group, &size, &groups, limit);
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/* Try to set the maximum number of groups the kernel can handle. */
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do
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result = setgroups (ngroups, groups);
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while (result == -1 && errno == EINVAL && --ngroups > 0);
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free (groups);
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return result;
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#endif
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}
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static_link_warning (initgroups)
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