2000-03-26 00:33:07 +00:00
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/*
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conf.c -- configuration code
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2000-11-28 23:12:57 +00:00
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Copyright (C) 1998 Robert van der Meulen
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2001-01-07 17:09:07 +00:00
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1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>
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2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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2000 Cris van Pelt <tribbel@arise.dhs.org>
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2000-03-26 00:33:07 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2000-05-30 11:18:12 +00:00
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2001-11-16 22:31:41 +00:00
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$Id: conf.c,v 1.9.4.51 2001/11/16 22:31:41 zarq Exp $
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2000-03-26 00:33:07 +00:00
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*/
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2000-11-03 22:35:12 +00:00
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#include "config.h"
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2000-05-15 18:28:45 +00:00
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2000-03-26 00:33:07 +00:00
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2000-10-11 22:01:02 +00:00
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#include <syslog.h>
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2000-11-30 00:24:13 +00:00
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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2001-01-05 23:53:53 +00:00
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#include <syslog.h>
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2001-07-24 20:03:40 +00:00
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#include <string.h>
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2000-03-26 00:33:07 +00:00
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#include <xalloc.h>
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2000-11-28 23:12:57 +00:00
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#include <utils.h> /* for cp */
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2001-10-10 20:34:27 +00:00
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#include <avl_tree.h>
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2000-03-26 00:33:07 +00:00
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#include "conf.h"
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2000-05-29 21:01:26 +00:00
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#include "system.h"
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2001-10-10 20:34:27 +00:00
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avl_tree_t *config_tree;
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2000-03-26 00:33:07 +00:00
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int debug_lvl = 0;
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int timeout = 0; /* seconds before timeout */
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2000-10-14 17:04:16 +00:00
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char *confbase = NULL; /* directory in which all config files are */
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2000-10-15 00:59:37 +00:00
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char *netname = NULL; /* name of the vpn network */
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2000-06-29 19:47:04 +00:00
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/* Will be set if HUP signal is received. It will be processed when it is safe. */
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int sighup = 0;
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2000-03-26 00:33:07 +00:00
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2001-10-10 20:34:27 +00:00
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int config_compare(config_t *a, config_t *b)
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{
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int result;
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result = strcmp(a->variable, b->variable);
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if(result)
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return result;
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2000-03-26 00:33:07 +00:00
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2001-10-10 20:34:27 +00:00
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result = a->line - b->line;
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if(result)
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return result;
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else
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return strcmp(a->file, b->file);
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}
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void init_configuration(avl_tree_t **config_tree)
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2000-03-26 00:33:07 +00:00
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{
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2000-06-29 19:47:04 +00:00
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cp
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2001-10-10 20:34:27 +00:00
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*config_tree = avl_alloc_tree((avl_compare_t)config_compare, (avl_action_t)free_config);
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cp
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}
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2000-10-16 16:33:30 +00:00
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2001-10-10 20:34:27 +00:00
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void exit_configuration(avl_tree_t **config_tree)
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{
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cp
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avl_delete_tree(*config_tree);
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*config_tree = NULL;
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cp
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}
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config_t *new_config(void)
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{
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config_t *cfg;
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cp
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cfg = (config_t *)xmalloc_and_zero(sizeof(*cfg));
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return cfg;
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}
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2000-03-26 00:33:07 +00:00
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2001-10-10 20:34:27 +00:00
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void free_config(config_t *cfg)
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{
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cp
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if(cfg->variable)
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free(cfg->variable);
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if(cfg->value)
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free(cfg->value);
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if(cfg->file)
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free(cfg->file);
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free(cfg);
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cp
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}
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void config_add(avl_tree_t *config_tree, config_t *cfg)
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{
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cp
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avl_insert(config_tree, cfg);
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cp
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}
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2000-06-30 11:45:16 +00:00
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2001-10-10 20:34:27 +00:00
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config_t *lookup_config(avl_tree_t *config_tree, char *variable)
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{
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config_t cfg, *found;
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cp
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cfg.variable = variable;
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cfg.file = "";
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cfg.line = 0;
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found = avl_search_closest_greater(config_tree, &cfg);
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2001-10-27 15:19:13 +00:00
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if(!found)
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return NULL;
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2001-10-10 20:34:27 +00:00
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2001-10-27 15:19:13 +00:00
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if(strcmp(found->variable, variable))
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2001-10-10 20:34:27 +00:00
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return NULL;
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2001-10-27 15:19:13 +00:00
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return found;
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2001-10-10 20:34:27 +00:00
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}
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config_t *lookup_config_next(avl_tree_t *config_tree, config_t *cfg)
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{
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avl_node_t *node;
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config_t *found;
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cp
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node = avl_search_node(config_tree, cfg);
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if(node)
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2000-03-26 00:33:07 +00:00
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{
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2001-10-10 20:34:27 +00:00
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if(node->next)
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{
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found = (config_t *)node->next->data;
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if(!strcmp(found->variable, cfg->variable))
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return found;
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}
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}
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return NULL;
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}
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int get_config_bool(config_t *cfg, int *result)
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{
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2000-10-15 00:59:37 +00:00
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cp
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2001-10-10 20:34:27 +00:00
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if(!cfg)
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return 0;
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if(!strcasecmp(cfg->value, "yes"))
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{
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*result = 1;
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return 1;
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2000-03-26 00:33:07 +00:00
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}
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2001-11-16 22:31:41 +00:00
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else if(!strcasecmp(cfg->value, "no"))
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2000-10-15 00:59:37 +00:00
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{
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2001-10-10 20:34:27 +00:00
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*result = 0;
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return 1;
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}
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syslog(LOG_ERR, _("\"yes\" or \"no\" expected for configuration variable %s in %s line %d"),
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2001-10-31 20:07:17 +00:00
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cfg->variable, cfg->file, cfg->line);
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2001-10-10 20:34:27 +00:00
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return 0;
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}
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int get_config_int(config_t *cfg, int *result)
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{
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2000-06-29 19:47:04 +00:00
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cp
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2001-10-10 20:34:27 +00:00
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if(!cfg)
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return 0;
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if(sscanf(cfg->value, "%d", result) == 1)
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return 1;
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syslog(LOG_ERR, _("Integer expected for configuration variable %s in %s line %d"),
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2001-10-31 20:07:17 +00:00
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cfg->variable, cfg->file, cfg->line);
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2001-10-10 20:34:27 +00:00
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return 0;
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}
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int get_config_string(config_t *cfg, char **result)
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{
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cp
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if(!cfg)
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return 0;
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*result = cfg->value;
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return 1;
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}
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2001-10-27 12:13:17 +00:00
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int get_config_subnet(config_t *cfg, subnet_t **result)
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{
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subnet_t *subnet;
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cp
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if(!cfg)
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return 0;
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2001-11-16 22:31:15 +00:00
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#warning FIXME
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/* ip = strtoip(cfg->value); */
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2001-10-27 12:13:17 +00:00
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2001-11-16 22:31:15 +00:00
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/* if(!ip) */
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/* { */
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/* syslog(LOG_ERR, _("IP address expected for configuration variable %s in %s line %d"), */
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/* cfg->variable, cfg->file, cfg->line); */
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/* return 0; */
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/* } */
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2001-10-27 12:13:17 +00:00
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/* Teach newbies what subnets are... */
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2001-11-16 22:31:15 +00:00
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/* if((ip->address & ip->mask) != ip->address) */
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/* { */
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/* syslog(LOG_ERR, _("Network address and subnet mask for configuration variable %s in %s line %d"), */
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/* cfg->variable, cfg->file, cfg->line); */
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/* free(ip); */
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/* return 0; */
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/* } */
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/* subnet = new_subnet(); */
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/* subnet->type = SUBNET_IP; */
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/* subnet->net.ip.address = ip->address; */
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/* subnet->net.ip.mask = ip->mask; */
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2001-10-27 12:13:17 +00:00
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2001-11-16 22:31:15 +00:00
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/* free(ip); */
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2001-10-27 12:13:17 +00:00
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2001-11-16 22:31:15 +00:00
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/* *result = subnet; */
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2001-10-27 12:13:17 +00:00
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return 1;
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}
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2000-11-29 14:24:40 +00:00
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/*
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Read exactly one line and strip the trailing newline if any. If the
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file was on EOF, return NULL. Otherwise, return all the data in a
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dynamically allocated buffer.
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2000-12-01 12:36:36 +00:00
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If line is non-NULL, it will be used as an initial buffer, to avoid
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unnecessary mallocing each time this function is called. If buf is
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given, and buf needs to be expanded, the var pointed to by buflen
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will be increased.
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2000-11-29 14:24:40 +00:00
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*/
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2000-12-05 08:56:44 +00:00
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char *readline(FILE *fp, char **buf, size_t *buflen)
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2000-11-29 14:24:40 +00:00
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{
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char *newline = NULL;
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char *p;
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char *line; /* The array that contains everything that has been read
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so far */
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char *idx; /* Read into this pointer, which points to an offset
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within line */
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size_t size, newsize; /* The size of the current array pointed to by
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line */
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size_t maxlen; /* Maximum number of characters that may be read with
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fgets. This is newsize - oldsize. */
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if(feof(fp))
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return NULL;
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2000-12-01 12:36:36 +00:00
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if((buf != NULL) && (buflen != NULL))
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{
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size = *buflen;
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2000-12-05 08:56:44 +00:00
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line = *buf;
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2000-12-01 12:36:36 +00:00
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}
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else
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{
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size = 100;
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line = xmalloc(size);
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}
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2000-11-29 14:24:40 +00:00
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maxlen = size;
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idx = line;
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2000-11-30 22:32:14 +00:00
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*idx = 0;
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2000-11-29 14:24:40 +00:00
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for(;;)
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{
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errno = 0;
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p = fgets(idx, maxlen, fp);
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if(p == NULL) /* EOF or error */
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{
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if(feof(fp))
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break;
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/* otherwise: error; let the calling function print an error
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message if applicable */
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free(line);
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return NULL;
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}
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newline = strchr(p, '\n');
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if(newline == NULL)
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/* We haven't yet read everything to the end of the line */
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{
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newsize = size << 1;
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line = xrealloc(line, newsize);
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idx = &line[size - 1];
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maxlen = newsize - size + 1;
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size = newsize;
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}
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else
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{
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*newline = '\0'; /* kill newline */
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break; /* yay */
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}
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}
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2000-12-01 12:36:36 +00:00
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if((buf != NULL) && (buflen != NULL))
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2000-12-05 08:56:44 +00:00
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{
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*buflen = size;
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*buf = line;
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}
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2000-11-29 14:24:40 +00:00
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return line;
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}
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2000-03-26 00:33:07 +00:00
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/*
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2000-10-11 13:42:52 +00:00
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Parse a configuration file and put the results in the configuration tree
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starting at *base.
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2000-03-26 00:33:07 +00:00
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*/
|
2001-10-10 20:34:27 +00:00
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int read_config_file(avl_tree_t *config_tree, const char *fname)
|
2000-03-26 00:33:07 +00:00
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{
|
2000-12-05 08:56:44 +00:00
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int err = -2; /* Parse error */
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2000-10-11 13:42:52 +00:00
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FILE *fp;
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2000-12-01 12:38:42 +00:00
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char *buffer, *line;
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2001-10-10 20:34:27 +00:00
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char *variable, *value;
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int lineno = 0, ignore = 0;
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2000-03-26 00:33:07 +00:00
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config_t *cfg;
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2000-12-01 12:36:36 +00:00
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size_t bufsize;
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2000-06-29 19:47:04 +00:00
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cp
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2000-10-11 13:42:52 +00:00
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|
|
if((fp = fopen (fname, "r")) == NULL)
|
2000-12-22 21:34:24 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Cannot open config file %s: %m"), fname);
|
2001-01-17 01:30:05 +00:00
|
|
|
return -3;
|
2000-12-22 21:34:24 +00:00
|
|
|
}
|
2000-10-11 13:42:52 +00:00
|
|
|
|
2000-12-01 12:36:36 +00:00
|
|
|
bufsize = 100;
|
2000-12-01 12:38:42 +00:00
|
|
|
buffer = xmalloc(bufsize);
|
2000-12-01 12:36:36 +00:00
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
for(;;)
|
|
|
|
{
|
2000-12-05 08:56:44 +00:00
|
|
|
if((line = readline(fp, &buffer, &bufsize)) == NULL)
|
2000-11-29 14:27:24 +00:00
|
|
|
{
|
|
|
|
err = -1;
|
|
|
|
break;
|
|
|
|
}
|
2000-11-30 22:32:14 +00:00
|
|
|
|
|
|
|
if(feof(fp))
|
|
|
|
{
|
|
|
|
err = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2000-10-11 13:42:52 +00:00
|
|
|
lineno++;
|
2000-05-15 18:28:45 +00:00
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
if((variable = strtok(line, "\t =")) == NULL)
|
2000-03-26 00:33:07 +00:00
|
|
|
continue; /* no tokens on this line */
|
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
if(variable[0] == '#')
|
2000-03-26 00:33:07 +00:00
|
|
|
continue; /* comment: ignore */
|
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
if(!strcmp(variable, "-----BEGIN"))
|
2001-01-13 16:36:23 +00:00
|
|
|
ignore = 1;
|
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
if(!ignore)
|
2001-01-13 16:36:23 +00:00
|
|
|
{
|
2001-10-10 20:34:27 +00:00
|
|
|
if(((value = strtok(NULL, "\t\n\r =")) == NULL) || value[0] == '#')
|
2001-01-13 16:36:23 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("No value for variable `%s' on line %d while reading config file %s"),
|
2001-10-10 20:34:27 +00:00
|
|
|
variable, lineno, fname);
|
2001-01-13 16:36:23 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
cfg = new_config();
|
|
|
|
cfg->variable = xstrdup(variable);
|
|
|
|
cfg->value = xstrdup(value);
|
|
|
|
cfg->file = xstrdup(fname);
|
|
|
|
cfg->line = lineno;
|
2001-01-13 16:36:23 +00:00
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
config_add(config_tree, cfg);
|
2001-01-13 16:36:23 +00:00
|
|
|
}
|
|
|
|
|
2001-10-10 20:34:27 +00:00
|
|
|
if(!strcmp(variable, "-----END"))
|
2001-01-13 16:36:23 +00:00
|
|
|
ignore = 0;
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
|
|
|
|
2000-12-01 12:38:42 +00:00
|
|
|
free(buffer);
|
2000-03-26 00:33:07 +00:00
|
|
|
fclose (fp);
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-06-30 11:45:16 +00:00
|
|
|
return err;
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
|
|
|
|
2000-10-14 17:04:16 +00:00
|
|
|
int read_server_config()
|
|
|
|
{
|
|
|
|
char *fname;
|
|
|
|
int x;
|
|
|
|
cp
|
2000-10-15 00:59:37 +00:00
|
|
|
asprintf(&fname, "%s/tinc.conf", confbase);
|
2001-10-10 20:34:27 +00:00
|
|
|
x = read_config_file(config_tree, fname);
|
2001-01-17 01:30:05 +00:00
|
|
|
if(x == -1) /* System error: complain */
|
2000-10-22 13:47:41 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("Failed to read `%s': %m"),
|
2000-10-22 13:47:41 +00:00
|
|
|
fname);
|
|
|
|
}
|
2000-10-14 17:04:16 +00:00
|
|
|
free(fname);
|
|
|
|
cp
|
|
|
|
return x;
|
|
|
|
}
|
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
int isadir(const char* f)
|
|
|
|
{
|
|
|
|
struct stat s;
|
|
|
|
|
|
|
|
if(stat(f, &s) < 0)
|
2001-01-06 18:03:41 +00:00
|
|
|
return 0;
|
|
|
|
else
|
|
|
|
return S_ISDIR(s.st_mode);
|
2000-11-30 00:24:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int is_safe_path(const char *file)
|
|
|
|
{
|
|
|
|
char *p;
|
2001-01-06 18:03:41 +00:00
|
|
|
const char *f;
|
|
|
|
char x;
|
2000-11-30 00:24:13 +00:00
|
|
|
struct stat s;
|
2001-01-06 18:03:41 +00:00
|
|
|
char l[MAXBUFSIZE];
|
2000-11-30 00:24:13 +00:00
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
if(*file != '/')
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("`%s' is not an absolute path"), file);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
p = strrchr(file, '/');
|
2001-01-06 18:03:41 +00:00
|
|
|
|
|
|
|
if(p == file) /* It's in the root */
|
|
|
|
p++;
|
|
|
|
|
|
|
|
x = *p;
|
2000-11-30 00:24:13 +00:00
|
|
|
*p = '\0';
|
2001-01-06 18:03:41 +00:00
|
|
|
|
|
|
|
f = file;
|
|
|
|
check1:
|
|
|
|
if(lstat(f, &s) < 0)
|
2000-11-30 00:24:13 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f);
|
2000-11-30 00:24:13 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
if(s.st_uid != geteuid())
|
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f, s.st_uid, geteuid());
|
2000-11-30 00:24:13 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
if(S_ISLNK(s.st_mode))
|
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f);
|
|
|
|
|
|
|
|
if(readlink(f, l, MAXBUFSIZE) < 0)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
f = l;
|
|
|
|
goto check1;
|
2000-11-30 00:24:13 +00:00
|
|
|
}
|
|
|
|
|
2001-01-06 18:03:41 +00:00
|
|
|
*p = x;
|
|
|
|
f = file;
|
|
|
|
|
|
|
|
check2:
|
|
|
|
if(lstat(f, &s) < 0 && errno != ENOENT)
|
2000-11-30 00:24:13 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f);
|
2000-11-30 00:24:13 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 21:11:03 +00:00
|
|
|
if(errno == ENOENT)
|
|
|
|
return 1;
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
if(s.st_uid != geteuid())
|
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f, s.st_uid, geteuid());
|
2000-11-30 00:24:13 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
if(S_ISLNK(s.st_mode))
|
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f);
|
|
|
|
|
|
|
|
if(readlink(f, l, MAXBUFSIZE) < 0)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
f = l;
|
|
|
|
goto check2;
|
2000-11-30 00:24:13 +00:00
|
|
|
}
|
2001-01-06 18:03:41 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
if(s.st_mode & 0007)
|
|
|
|
{
|
|
|
|
/* Accessible by others */
|
2001-01-05 23:53:53 +00:00
|
|
|
syslog(LOG_ERR, _("`%s' has unsecure permissions"),
|
2001-01-06 18:03:41 +00:00
|
|
|
f);
|
2000-11-30 00:24:13 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
2000-11-28 23:12:57 +00:00
|
|
|
|
2001-01-13 16:36:23 +00:00
|
|
|
FILE *ask_and_safe_open(const char* filename, const char* what, const char* mode)
|
2000-11-28 23:12:57 +00:00
|
|
|
{
|
|
|
|
FILE *r;
|
|
|
|
char *directory;
|
|
|
|
char *fn;
|
|
|
|
|
2000-11-29 14:24:40 +00:00
|
|
|
/* Check stdin and stdout */
|
|
|
|
if(!isatty(0) || !isatty(1))
|
2000-11-28 23:12:57 +00:00
|
|
|
{
|
|
|
|
/* Argh, they are running us from a script or something. Write
|
|
|
|
the files to the current directory and let them burn in hell
|
|
|
|
for ever. */
|
2000-11-29 14:24:40 +00:00
|
|
|
fn = xstrdup(filename);
|
2000-11-28 23:12:57 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2000-11-29 14:24:40 +00:00
|
|
|
/* Ask for a file and/or directory name. */
|
|
|
|
fprintf(stdout, _("Please enter a file to save %s to [%s]: "),
|
|
|
|
what, filename);
|
2001-01-05 23:53:53 +00:00
|
|
|
fflush(stdout);
|
|
|
|
|
2000-12-01 12:36:36 +00:00
|
|
|
if((fn = readline(stdin, NULL, NULL)) == NULL)
|
2000-11-29 14:24:40 +00:00
|
|
|
{
|
2001-07-24 20:03:40 +00:00
|
|
|
fprintf(stderr, _("Error while reading stdin: %s\n"), strerror(errno));
|
2000-11-29 14:24:40 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
2001-01-05 23:53:53 +00:00
|
|
|
|
2000-11-29 14:24:40 +00:00
|
|
|
if(strlen(fn) == 0)
|
|
|
|
/* User just pressed enter. */
|
|
|
|
fn = xstrdup(filename);
|
2000-11-28 23:12:57 +00:00
|
|
|
}
|
|
|
|
|
2000-11-29 14:24:40 +00:00
|
|
|
if((strchr(fn, '/') == NULL) || (fn[0] != '/'))
|
|
|
|
{
|
|
|
|
/* The directory is a relative path or a filename. */
|
|
|
|
char *p;
|
|
|
|
|
|
|
|
directory = get_current_dir_name();
|
2001-01-06 18:03:41 +00:00
|
|
|
asprintf(&p, "%s/%s", directory, fn);
|
2000-11-29 14:24:40 +00:00
|
|
|
free(fn);
|
2000-11-30 00:24:13 +00:00
|
|
|
free(directory);
|
2000-11-29 14:24:40 +00:00
|
|
|
fn = p;
|
|
|
|
}
|
2000-11-28 23:12:57 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
umask(0077); /* Disallow everything for group and other */
|
|
|
|
|
|
|
|
/* Open it first to keep the inode busy */
|
2001-01-13 16:36:23 +00:00
|
|
|
if((r = fopen(fn, mode)) == NULL)
|
2000-11-28 23:12:57 +00:00
|
|
|
{
|
2001-07-24 20:03:40 +00:00
|
|
|
fprintf(stderr, _("Error opening file `%s': %s\n"),
|
|
|
|
fn, strerror(errno));
|
2000-11-30 00:24:13 +00:00
|
|
|
free(fn);
|
|
|
|
return NULL;
|
|
|
|
}
|
2001-01-13 16:36:23 +00:00
|
|
|
|
2000-11-30 00:24:13 +00:00
|
|
|
/* Then check the file for nasty attacks */
|
|
|
|
if(!is_safe_path(fn)) /* Do not permit any directories that are
|
|
|
|
readable or writeable by other users. */
|
|
|
|
{
|
|
|
|
fprintf(stderr, _("The file `%s' (or any of the leading directories) has unsafe permissions.\n"
|
|
|
|
"I will not create or overwrite this file.\n"),
|
|
|
|
fn);
|
|
|
|
fclose(r);
|
|
|
|
free(fn);
|
|
|
|
return NULL;
|
2000-11-28 23:12:57 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
free(fn);
|
2001-01-13 16:36:23 +00:00
|
|
|
|
2000-11-28 23:12:57 +00:00
|
|
|
return r;
|
|
|
|
}
|