619 lines
15 KiB
C
619 lines
15 KiB
C
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <nss.h>
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#include <grp.h>
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#include <ctype.h>
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#include <libc-lock.h>
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#include <string.h>
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#include <rpcsvc/yp.h>
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/nis.h>
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#include <rpcsvc/nislib.h>
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#include <nsswitch.h>
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#include "nss-nisplus.h"
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static service_user *ni = NULL;
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static bool_t use_nisplus = FALSE; /* default: group_compat: nis */
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/* Get the declaration of the parser function. */
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#define ENTNAME grent
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#define STRUCTURE group
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#define EXTERN_PARSER
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#include "../../nss/nss_files/files-parse.c"
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/* Structure for remembering -group members ... */
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#define BLACKLIST_INITIAL_SIZE 512
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#define BLACKLIST_INCREMENT 256
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struct blacklist_t
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{
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char *data;
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int current;
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int size;
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};
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struct ent_t
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{
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bool_t nis;
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bool_t nis_first;
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char *oldkey;
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int oldkeylen;
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nis_result *result;
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nis_name *names;
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u_long names_nr;
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FILE *stream;
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struct blacklist_t blacklist;
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};
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typedef struct ent_t ent_t;
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static ent_t ext_ent = {0, 0, NULL, 0, NULL, NULL, 0, NULL, {NULL, 0, 0}};
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/* Protect global state against multiple changers. */
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__libc_lock_define_initialized (static, lock)
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/* Prototypes for local functions. */
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static void blacklist_store_name (const char *, ent_t *);
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static int in_blacklist (const char *, int, ent_t *);
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extern int _nss_nisplus_parse_grent (nis_result *, struct group *,
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char *, size_t);
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static enum nss_status
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internal_setgrent (ent_t *ent)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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ent->nis = ent->nis_first = 0;
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if (ent->oldkey != NULL)
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{
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free (ent->oldkey);
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ent->oldkey = NULL;
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ent->oldkeylen = 0;
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}
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if (ent->result != NULL)
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{
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nis_freeresult (ent->result);
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ent->result = NULL;
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}
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if (ent->names != NULL)
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{
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nis_freenames (ent->names);
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ent->names = NULL;
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}
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ent->names_nr = 0;
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ent->blacklist.current = 0;
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if (ent->blacklist.data != NULL)
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ent->blacklist.data[0] = '\0';
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if (ent->stream == NULL)
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{
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ent->stream = fopen ("/etc/group", "r");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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}
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else
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rewind (ent->stream);
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return status;
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}
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enum nss_status
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_nss_compat_setgrent (void)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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if (ni == NULL)
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{
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__nss_database_lookup ("group_compat", NULL, "nis", &ni);
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use_nisplus = (strcmp (ni->name, "nisplus") == 0);
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}
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result = internal_setgrent (&ext_ent);
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__libc_lock_unlock (lock);
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return result;
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}
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static enum nss_status
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internal_endgrent (ent_t *ent)
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{
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if (ent->stream != NULL)
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{
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fclose (ent->stream);
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ent->stream = NULL;
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}
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ent->nis = ent->nis_first = 0;
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if (ent->oldkey != NULL)
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{
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free (ent->oldkey);
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ent->oldkey = NULL;
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ent->oldkeylen = 0;
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}
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if (ent->result != NULL)
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{
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nis_freeresult (ent->result);
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ent->result = NULL;
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}
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if (ent->names != NULL)
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{
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nis_freenames (ent->names);
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ent->names = NULL;
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}
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ent->names_nr = 0;
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ent->blacklist.current = 0;
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if (ent->blacklist.data != NULL)
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ent->blacklist.data[0] = '\0';
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_compat_endgrent (void)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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result = internal_endgrent (&ext_ent);
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__libc_lock_unlock (lock);
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return result;
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}
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static enum nss_status
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getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
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size_t buflen)
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{
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struct parser_data *data = (void *) buffer;
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char *domain;
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char *outkey, *outval;
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int outkeylen, outvallen, parse_res;
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char *p;
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if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_NOTFOUND;
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}
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do
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{
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if (ent->nis_first)
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{
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if (yp_first (domain, "group.byname", &outkey, &outkeylen,
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&outval, &outvallen) != YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_UNAVAIL;
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}
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ent->oldkey = outkey;
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ent->oldkeylen = outkeylen;
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ent->nis_first = FALSE;
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}
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else
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{
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if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
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&outkey, &outkeylen, &outval, &outvallen)
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!= YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_NOTFOUND;
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}
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free (ent->oldkey);
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ent->oldkey = outkey;
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ent->oldkeylen = outkeylen;
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}
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/* Copy the found data to our buffer */
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p = strncpy (buffer, outval, buflen);
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/* ...and free the data. */
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free (outval);
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while (isspace (*p))
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++p;
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parse_res = _nss_files_parse_grent (p, result, data, buflen);
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if (parse_res &&
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in_blacklist (result->gr_name, strlen (result->gr_name), ent))
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parse_res = 0; /* if result->gr_name in blacklist,search next entry */
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
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size_t buflen)
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{
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int parse_res;
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if (ent->names == NULL)
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{
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ent->names = nis_getnames ("group.org_dir");
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if (ent->names == NULL || ent->names[0] == NULL)
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{
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ent->nis = 0;
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return NSS_STATUS_UNAVAIL;
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}
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}
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do
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{
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if (ent->nis_first)
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{
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next_name:
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ent->result = nis_first_entry(ent->names[ent->names_nr]);
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if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
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{
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ent->nis = 0;
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return niserr2nss (ent->result->status);
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}
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ent->nis_first = FALSE;
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}
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else
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{
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nis_result *res;
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res = nis_next_entry(ent->names[ent->names_nr],
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&ent->result->cookie);
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nis_freeresult (ent->result);
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ent->result = res;
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if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
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{
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if ((ent->result->status == NIS_NOTFOUND) &&
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ent->names[ent->names_nr + 1] != NULL)
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{
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nis_freeresult (ent->result);
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ent->names_nr += 1;
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goto next_name;
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}
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else
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{
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ent->nis = 0;
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return niserr2nss (ent->result->status);
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}
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}
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}
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parse_res = _nss_nisplus_parse_grent (ent->result, result, buffer,
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buflen);
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if (parse_res &&
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in_blacklist (result->gr_name, strlen (result->gr_name), ent))
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parse_res = 0; /* if result->gr_name in blacklist,search next entry */
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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/* This function handle the +group entrys in /etc/group */
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static enum nss_status
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getgrent_next_file_plusgroup (struct group *result, char *buffer,
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size_t buflen)
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{
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struct parser_data *data = (void *) buffer;
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int parse_res;
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if (use_nisplus) /* Do the NIS+ query here */
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{
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nis_result *res;
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char buf[strlen (result->gr_name) + 24];
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sprintf(buf, "[name=%s],group.org_dir",
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&result->gr_name[1]);
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res = nis_list(buf, EXPAND_NAME, NULL, NULL);
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if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
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{
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enum nss_status status = niserr2nss (res->status);
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nis_freeresult (res);
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return status;
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}
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parse_res = _nss_nisplus_parse_grent (res, result, buffer, buflen);
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nis_freeresult (res);
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}
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else /* Use NIS */
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{
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char *domain, *outval, *p;
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int outvallen;
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if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
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return NSS_STATUS_TRYAGAIN;
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if (yp_match (domain, "group.byname", &result->gr_name[1],
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strlen (result->gr_name) - 1, &outval, &outvallen)
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!= YPERR_SUCCESS)
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return NSS_STATUS_TRYAGAIN;
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p = strncpy (buffer, outval,
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buflen < outvallen ? buflen : outvallen);
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free (outval);
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while (isspace (*p))
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p++;
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parse_res = _nss_files_parse_grent (p, result, data, buflen);
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}
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if (parse_res)
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/* We found the entry. */
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return NSS_STATUS_SUCCESS;
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else
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return NSS_STATUS_RETURN;
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}
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static enum nss_status
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getgrent_next_file (struct group *result, ent_t *ent,
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char *buffer, size_t buflen)
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{
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struct parser_data *data = (void *) buffer;
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while (1)
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{
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char *p;
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do
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{
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p = fgets (buffer, buflen, ent->stream);
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if (p == NULL)
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return NSS_STATUS_NOTFOUND;
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/* Terminate the line for any case. */
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buffer[buflen - 1] = '\0';
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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}
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/* Ignore empty and comment lines. */
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while (*p == '\0' || *p == '#' ||
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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!_nss_files_parse_grent (p, result, data, buflen));
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if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
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/* This is a real entry. */
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break;
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/* -group */
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if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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blacklist_store_name (&result->gr_name[1], ent);
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continue;
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}
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/* +group */
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if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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enum nss_status status;
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status = getgrent_next_file_plusgroup (result, buffer, buflen);
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if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
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break;
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else
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if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
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continue;
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else
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return status;
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}
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/* +:... */
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if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
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{
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ent->nis = TRUE;
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ent->nis_first = TRUE;
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if (use_nisplus)
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return getgrent_next_nisplus (result, ent, buffer, buflen);
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else
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return getgrent_next_nis (result, ent, buffer, buflen);
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
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size_t buflen)
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{
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if (ent->nis)
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{
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if (use_nisplus)
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return getgrent_next_nisplus (gr, ent, buffer, buflen);
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else
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return getgrent_next_nis (gr, ent, buffer, buflen);
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}
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else
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return getgrent_next_file (gr, ent, buffer, buflen);
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}
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enum nss_status
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_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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__libc_lock_lock (lock);
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if (ni == NULL)
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{
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__nss_database_lookup ("group_compat", NULL, "nis", &ni);
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use_nisplus = (strcmp (ni->name, "nisplus") == 0);
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}
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/* Be prepared that the setgrent function was not called before. */
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if (ext_ent.stream == NULL)
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status = internal_setgrent (&ext_ent);
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|
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if (status == NSS_STATUS_SUCCESS)
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status = internal_getgrent_r (grp, &ext_ent, buffer, buflen);
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__libc_lock_unlock (lock);
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return status;
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}
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|
|
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enum nss_status
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_nss_compat_getgrnam_r (const char *name, struct group *grp,
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char *buffer, size_t buflen)
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|
{
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|
ent_t ent = {0, 0, NULL, 0, NULL, NULL, 0, NULL, {NULL, 0, 0}};
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enum nss_status status;
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|
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if (name[0] == '-' || name[0] == '+')
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return NSS_STATUS_NOTFOUND;
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|
|
__libc_lock_lock (lock);
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|
|
|
if (ni == NULL)
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|
{
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|
__nss_database_lookup ("group_compat", NULL, "nis", &ni);
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use_nisplus = (strcmp (ni->name, "nisplus") == 0);
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|
}
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|
|
__libc_lock_unlock (lock);
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|
status = internal_setgrent (&ent);
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if (status != NSS_STATUS_SUCCESS)
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|
return status;
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|
|
while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
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== NSS_STATUS_SUCCESS)
|
|
if (strcmp (grp->gr_name, name) == 0)
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break;
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|
internal_endgrent (&ent);
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return status;
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|
}
|
|
|
|
|
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enum nss_status
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_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
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|
char *buffer, size_t buflen)
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|
{
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|
ent_t ent = {0, 0, NULL, 0, NULL, NULL, 0, NULL, {NULL, 0, 0}};
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|
enum nss_status status;
|
|
|
|
__libc_lock_lock (lock);
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|
|
|
if (ni == NULL)
|
|
{
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|
__nss_database_lookup ("group_compat", NULL, "nis", &ni);
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use_nisplus = (strcmp (ni->name, "nisplus") == 0);
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}
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|
|
__libc_lock_unlock (lock);
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|
status = internal_setgrent (&ent);
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if (status != NSS_STATUS_SUCCESS)
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|
return status;
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|
|
|
while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
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== NSS_STATUS_SUCCESS)
|
|
if (grp->gr_gid == gid && grp->gr_name[0] != '+' && grp->gr_name[0] != '-')
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break;
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|
|
internal_endgrent (&ent);
|
|
return status;
|
|
}
|
|
|
|
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/* Support routines for remembering -@netgroup and -user entries.
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The names are stored in a single string with `|' as separator. */
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static void
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blacklist_store_name (const char *name, ent_t *ent)
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{
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int namelen = strlen (name);
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char *tmp;
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|
|
|
/* first call, setup cache */
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if (ent->blacklist.size == 0)
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{
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ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
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ent->blacklist.data = malloc (ent->blacklist.size);
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if (ent->blacklist.data == NULL)
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return;
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ent->blacklist.data[0] = '|';
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ent->blacklist.data[1] = '\0';
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ent->blacklist.current = 1;
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}
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else
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{
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if (in_blacklist (name, namelen, ent))
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return; /* no duplicates */
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|
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|
if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
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|
{
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|
ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
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|
tmp = realloc (ent->blacklist.data, ent->blacklist.size);
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|
if (tmp == NULL)
|
|
{
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|
free (ent->blacklist.data);
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|
ent->blacklist.size = 0;
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|
return;
|
|
}
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|
ent->blacklist.data = tmp;
|
|
}
|
|
}
|
|
|
|
tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
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|
*tmp++ = '|';
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|
*tmp = '\0';
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|
ent->blacklist.current += namelen + 1;
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|
|
|
return;
|
|
}
|
|
|
|
/* returns TRUE if ent->blacklist contains name, else FALSE */
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|
static bool_t
|
|
in_blacklist (const char *name, int namelen, ent_t *ent)
|
|
{
|
|
char buf[namelen + 3];
|
|
char *cp;
|
|
|
|
if (ent->blacklist.data == NULL)
|
|
return FALSE;
|
|
|
|
buf[0] = '|';
|
|
cp = stpcpy (&buf[1], name);
|
|
*cp++= '|';
|
|
*cp = '\0';
|
|
return strstr (ent->blacklist.data, buf) != NULL;
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|
}
|