2000-03-26 00:33:07 +00:00
|
|
|
/*
|
|
|
|
conf.c -- configuration code
|
2000-11-28 23:12:57 +00:00
|
|
|
Copyright (C) 1998 Robert van der Meulen
|
2001-01-07 17:09:07 +00:00
|
|
|
1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>
|
|
|
|
2000,2001 Guus Sliepen <guus@sliepen.warande.net>
|
|
|
|
2000 Cris van Pelt <tribbel@arise.dhs.org>
|
2000-03-26 00:33:07 +00:00
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
|
|
it under the terms of the GNU General Public License as published by
|
|
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
|
|
(at your option) any later version.
|
|
|
|
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
GNU General Public License for more details.
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
|
|
along with this program; if not, write to the Free Software
|
|
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
2000-05-30 11:18:12 +00:00
|
|
|
|
2001-09-01 12:46:49 +00:00
|
|
|
$Id: conf.c,v 1.9.4.43 2001/09/01 12:46:49 guus Exp $
|
2000-03-26 00:33:07 +00:00
|
|
|
*/
|
|
|
|
|
2000-11-03 22:35:12 +00:00
|
|
|
#include "config.h"
|
2000-05-15 18:28:45 +00:00
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
#include <ctype.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <netdb.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
2000-10-11 22:01:02 +00:00
|
|
|
#include <syslog.h>
|
2000-11-30 00:24:13 +00:00
|
|
|
#include <sys/stat.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <unistd.h>
|
2001-01-05 23:53:53 +00:00
|
|
|
#include <syslog.h>
|
2001-07-24 20:03:40 +00:00
|
|
|
#include <string.h>
|
2000-03-26 00:33:07 +00:00
|
|
|
|
|
|
|
#include <xalloc.h>
|
2000-11-28 23:12:57 +00:00
|
|
|
#include <utils.h> /* for cp */
|
2000-03-26 00:33:07 +00:00
|
|
|
|
|
|
|
#include "conf.h"
|
|
|
|
#include "netutl.h" /* for strtoip */
|
|
|
|
|
2000-05-29 21:01:26 +00:00
|
|
|
#include "system.h"
|
|
|
|
|
2000-10-15 00:59:37 +00:00
|
|
|
config_t *config = NULL;
|
2000-03-26 00:33:07 +00:00
|
|
|
int debug_lvl = 0;
|
|
|
|
int timeout = 0; /* seconds before timeout */
|
2000-10-14 17:04:16 +00:00
|
|
|
char *confbase = NULL; /* directory in which all config files are */
|
2000-10-15 00:59:37 +00:00
|
|
|
char *netname = NULL; /* name of the vpn network */
|
2000-06-29 19:47:04 +00:00
|
|
|
|
|
|
|
/* Will be set if HUP signal is received. It will be processed when it is safe. */
|
|
|
|
int sighup = 0;
|
2000-03-26 00:33:07 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
These are all the possible configurable values
|
|
|
|
*/
|
|
|
|
static internal_config_t hazahaza[] = {
|
2000-10-11 13:42:52 +00:00
|
|
|
/* Main configuration file keywords */
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "ConnectTo", config_connectto, TYPE_NAME },
|
|
|
|
{ "Hostnames", config_hostnames, TYPE_BOOL },
|
|
|
|
{ "Interface", config_interface, TYPE_NAME },
|
|
|
|
{ "InterfaceIP", config_interfaceip, TYPE_IP },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "KeyExpire", config_keyexpire, TYPE_INT },
|
2000-12-06 13:33:49 +00:00
|
|
|
{ "MyVirtualIP", config_dummy, TYPE_IP },
|
|
|
|
{ "MyOwnVPNIP", config_dummy, TYPE_IP },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "Name", config_name, TYPE_NAME },
|
|
|
|
{ "PingTimeout", config_pingtimeout, TYPE_INT },
|
|
|
|
{ "PrivateKey", config_privatekey, TYPE_NAME },
|
2000-12-22 21:34:24 +00:00
|
|
|
{ "PrivateKeyFile", config_privatekeyfile, TYPE_NAME },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "TapDevice", config_tapdevice, TYPE_NAME },
|
2000-12-06 13:33:49 +00:00
|
|
|
{ "VpnMask", config_dummy, TYPE_IP },
|
2000-10-11 13:42:52 +00:00
|
|
|
/* Host configuration file keywords */
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "Address", config_address, TYPE_NAME },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "IndirectData", config_indirectdata, TYPE_BOOL },
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "Port", config_port, TYPE_INT },
|
|
|
|
{ "PublicKey", config_publickey, TYPE_NAME },
|
2000-12-22 21:34:24 +00:00
|
|
|
{ "PublicKeyFile", config_publickeyfile, TYPE_NAME },
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "RestrictAddress", config_restrictaddress, TYPE_BOOL },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "RestrictHosts", config_restricthosts, TYPE_BOOL },
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "RestrictPort", config_restrictport, TYPE_BOOL },
|
2000-12-03 12:22:19 +00:00
|
|
|
{ "RestrictSubnets", config_restrictsubnets, TYPE_BOOL },
|
|
|
|
{ "Subnet", config_subnet, TYPE_IP }, /* Use IPv4 subnets only for now */
|
2000-11-04 22:57:33 +00:00
|
|
|
{ "TCPonly", config_tcponly, TYPE_BOOL },
|
2001-06-05 19:39:54 +00:00
|
|
|
{ "Mode", config_mode, TYPE_NAME },
|
2000-03-26 00:33:07 +00:00
|
|
|
{ NULL, 0, 0 }
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
Add given value to the list of configs cfg
|
|
|
|
*/
|
|
|
|
config_t *
|
|
|
|
add_config_val(config_t **cfg, int argtype, char *val)
|
|
|
|
{
|
2000-10-29 00:02:20 +00:00
|
|
|
config_t *p;
|
2000-03-26 00:33:07 +00:00
|
|
|
char *q;
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-04-26 17:42:55 +00:00
|
|
|
p = (config_t*)xmalloc(sizeof(*p));
|
2000-03-26 00:33:07 +00:00
|
|
|
p->data.val = 0;
|
2000-10-16 16:33:30 +00:00
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
switch(argtype)
|
|
|
|
{
|
|
|
|
case TYPE_INT:
|
|
|
|
p->data.val = strtol(val, &q, 0);
|
|
|
|
if(q && *q)
|
|
|
|
p->data.val = 0;
|
|
|
|
break;
|
|
|
|
case TYPE_NAME:
|
|
|
|
p->data.ptr = xmalloc(strlen(val) + 1);
|
|
|
|
strcpy(p->data.ptr, val);
|
|
|
|
break;
|
|
|
|
case TYPE_IP:
|
|
|
|
p->data.ip = strtoip(val);
|
|
|
|
break;
|
|
|
|
case TYPE_BOOL:
|
|
|
|
if(!strcasecmp("yes", val))
|
|
|
|
p->data.val = stupid_true;
|
|
|
|
else if(!strcasecmp("no", val))
|
|
|
|
p->data.val = stupid_false;
|
|
|
|
else
|
|
|
|
p->data.val = 0;
|
|
|
|
}
|
|
|
|
|
2000-06-30 11:45:16 +00:00
|
|
|
p->argtype = argtype;
|
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
if(p->data.val)
|
|
|
|
{
|
2000-10-15 00:59:37 +00:00
|
|
|
p->next = *cfg;
|
|
|
|
*cfg = p;
|
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
return p;
|
|
|
|
}
|
2000-10-15 00:59:37 +00:00
|
|
|
else
|
|
|
|
{
|
|
|
|
free(p);
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-10-15 00:59:37 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
|
|
|
|
2000-11-29 14:24:40 +00:00
|
|
|
/*
|
|
|
|
Read exactly one line and strip the trailing newline if any. If the
|
|
|
|
file was on EOF, return NULL. Otherwise, return all the data in a
|
|
|
|
dynamically allocated buffer.
|
2000-12-01 12:36:36 +00:00
|
|
|
|
|
|
|
If line is non-NULL, it will be used as an initial buffer, to avoid
|
|
|
|
unnecessary mallocing each time this function is called. If buf is
|
|
|
|
given, and buf needs to be expanded, the var pointed to by buflen
|
|
|
|
will be increased.
|
2000-11-29 14:24:40 +00:00
|
|
|
*/
|
2000-12-05 08:56:44 +00:00
|
|
|
char *readline(FILE *fp, char **buf, size_t *buflen)
|
2000-11-29 14:24:40 +00:00
|
|
|
{
|
|
|
|
char *newline = NULL;
|
|
|
|
char *p;
|
|
|
|
char *line; /* The array that contains everything that has been read
|
|
|
|
so far */
|
|
|
|
char *idx; /* Read into this pointer, which points to an offset
|
|
|
|
within line */
|
|
|
|
size_t size, newsize; /* The size of the current array pointed to by
|
|
|
|
line */
|
|
|
|
size_t maxlen; /* Maximum number of characters that may be read with
|
|
|
|
fgets. This is newsize - oldsize. */
|
|
|
|
|
|
|
|
if(feof(fp))
|
|
|
|
return NULL;
|
2000-12-01 12:36:36 +00:00
|
|
|
|
|
|
|
if((buf != NULL) && (buflen != NULL))
|
|
|
|
{
|
|
|
|
size = *buflen;
|
2000-12-05 08:56:44 +00:00
|
|
|
line = *buf;
|
2000-12-01 12:36:36 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
size = 100;
|
|
|
|
line = xmalloc(size);
|
|
|
|
}
|
|
|
|
|
2000-11-29 14:24:40 +00:00
|
|
|
maxlen = size;
|
|
|
|
idx = line;
|
2000-11-30 22:32:14 +00:00
|
|
|
*idx = 0;
|
2000-11-29 14:24:40 +00:00
|
|
|
for(;;)
|
|
|
|
{
|
|
|
|
errno = 0;
|
|
|
|
p = fgets(idx, maxlen, fp);
|
|
|
|
if(p == NULL) /* EOF or error */
|
|
|
|
{
|
|
|
|
if(feof(fp))
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* otherwise: error; let the calling function print an error
|
|
|
|
message if applicable */
|
|
|
|
free(line);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
newline = strchr(p, '\n');
|
|
|
|
if(newline == NULL)
|
|
|
|
/* We haven't yet read everything to the end of the line */
|
|
|
|
{
|
|
|
|
newsize = size << 1;
|
|
|
|
line = xrealloc(line, newsize);
|
|
|
|
idx = &line[size - 1];
|
|
|
|
maxlen = newsize - size + 1;
|
|
|
|
size = newsize;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
*newline = '\0'; /* kill newline */
|
|
|
|
break; /* yay */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-12-01 12:36:36 +00:00
|
|
|
if((buf != NULL) && (buflen != NULL))
|
2000-12-05 08:56:44 +00:00
|
|
|
{
|
|
|
|
*buflen = size;
|
|
|
|
*buf = line;
|
|
|
|
}
|
2000-11-29 14:24:40 +00:00
|
|
|
return line;
|
|
|
|
}
|
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
/*
|
2000-10-11 13:42:52 +00:00
|
|
|
Parse a configuration file and put the results in the configuration tree
|
|
|
|
starting at *base.
|
2000-03-26 00:33:07 +00:00
|
|
|
*/
|
2000-10-11 13:42:52 +00:00
|
|
|
int read_config_file(config_t **base, const char *fname)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-12-05 08:56:44 +00:00
|
|
|
int err = -2; /* Parse error */
|
2000-10-11 13:42:52 +00:00
|
|
|
FILE *fp;
|
2000-12-01 12:38:42 +00:00
|
|
|
char *buffer, *line;
|
2000-03-26 00:33:07 +00:00
|
|
|
char *p, *q;
|
2001-01-13 16:36:23 +00:00
|
|
|
int i, lineno = 0, ignore = 0;
|
2000-03-26 00:33:07 +00:00
|
|
|
config_t *cfg;
|
2000-12-01 12:36:36 +00:00
|
|
|
size_t bufsize;
|
|
|
|
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-10-11 13:42:52 +00:00
|
|
|
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
|
|
|
|
2000-11-29 14:27:24 +00:00
|
|
|
if((p = strtok(line, "\t =")) == NULL)
|
2000-03-26 00:33:07 +00:00
|
|
|
continue; /* no tokens on this line */
|
|
|
|
|
|
|
|
if(p[0] == '#')
|
|
|
|
continue; /* comment: ignore */
|
|
|
|
|
2001-01-13 16:36:23 +00:00
|
|
|
if(!strcmp(p, "-----BEGIN"))
|
|
|
|
ignore = 1;
|
|
|
|
|
|
|
|
if(ignore == 0)
|
|
|
|
{
|
|
|
|
for(i = 0; hazahaza[i].name != NULL; i++)
|
|
|
|
if(!strcasecmp(hazahaza[i].name, p))
|
|
|
|
break;
|
|
|
|
|
|
|
|
if(!hazahaza[i].name)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Invalid variable name `%s' on line %d while reading config file %s"),
|
|
|
|
p, lineno, fname);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(((q = strtok(NULL, "\t\n\r =")) == NULL) || q[0] == '#')
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("No value for variable `%s' on line %d while reading config file %s"),
|
|
|
|
hazahaza[i].name, lineno, fname);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
cfg = add_config_val(base, hazahaza[i].argtype, q);
|
|
|
|
if(cfg == NULL)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Invalid value for variable `%s' on line %d while reading config file %s"),
|
|
|
|
hazahaza[i].name, lineno, fname);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
cfg->which = hazahaza[i].which;
|
|
|
|
if(!config)
|
|
|
|
config = cfg;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(!strcmp(p, "-----END"))
|
|
|
|
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);
|
2000-10-14 17:04:16 +00:00
|
|
|
x = read_config_file(&config, 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;
|
|
|
|
}
|
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
/*
|
|
|
|
Look up the value of the config option type
|
|
|
|
*/
|
2001-09-01 12:46:49 +00:00
|
|
|
const config_t *get_config_val(config_t const *p, which_t type)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-10-16 16:33:30 +00:00
|
|
|
for(; p != NULL; p = p->next)
|
2000-03-26 00:33:07 +00:00
|
|
|
if(p->which == type)
|
2000-10-15 00:59:37 +00:00
|
|
|
break;
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
2000-10-15 00:59:37 +00:00
|
|
|
return p;
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
2000-06-27 15:08:58 +00:00
|
|
|
|
2000-06-29 19:47:04 +00:00
|
|
|
/*
|
|
|
|
Remove the complete configuration tree.
|
|
|
|
*/
|
2000-10-11 13:42:52 +00:00
|
|
|
void clear_config(config_t **base)
|
2000-06-29 19:47:04 +00:00
|
|
|
{
|
|
|
|
config_t *p, *next;
|
|
|
|
cp
|
2000-10-11 13:42:52 +00:00
|
|
|
for(p = *base; p != NULL; p = next)
|
2000-06-29 19:47:04 +00:00
|
|
|
{
|
|
|
|
next = p->next;
|
2000-06-30 11:45:16 +00:00
|
|
|
if(p->data.ptr && (p->argtype == TYPE_NAME))
|
|
|
|
{
|
|
|
|
free(p->data.ptr);
|
|
|
|
}
|
2000-06-29 19:47:04 +00:00
|
|
|
free(p);
|
|
|
|
}
|
2000-10-11 13:42:52 +00:00
|
|
|
*base = NULL;
|
2000-06-29 19:47:04 +00:00
|
|
|
cp
|
|
|
|
}
|
2000-11-28 23:12:57 +00:00
|
|
|
|
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;
|
|
|
|
}
|