/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "syshead.h"
#include "push.h"
#include "options.h"
#include "ssl.h"
#include "manage.h"
#include "memdbg.h"
#if P2MP
/*
* Auth username/password
*
* Client received an authentication failed message from server.
* Runs on client.
*/
void
receive_auth_failed (struct context *c, const struct buffer *buffer)
{
msg (M_VERB0, "AUTH: Received AUTH_FAILED control message");
if (c->options.pull)
{
switch (auth_retry_get ())
{
case AR_NONE:
c->sig->signal_received = SIGTERM; /* SOFT-SIGTERM -- Auth failure error */
break;
case AR_INTERACT:
ssl_purge_auth ();
case AR_NOINTERACT:
c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Auth failure error */
break;
default:
ASSERT (0);
}
c->sig->signal_text = "auth-failure";
#ifdef ENABLE_MANAGEMENT
if (management)
management_auth_failure (management, UP_TYPE_AUTH);
#endif
}
}
#if P2MP_SERVER
/*
* Send auth failed message from server to client.
*/
void
send_auth_failed (struct context *c)
{
schedule_exit (c, c->options.scheduled_exit_interval);
send_control_channel_string (c, "AUTH_FAILED", D_PUSH);
}
#endif
/*
* Push/Pull
*/
void
incoming_push_message (struct context *c, const struct buffer *buffer)
{
struct gc_arena gc = gc_new ();
unsigned int option_types_found = 0;
int status;
msg (D_PUSH, "PUSH: Received control message: '%s'", BSTR (buffer));
status = process_incoming_push_msg (c,
buffer,
c->options.pull,
pull_permission_mask (c),
&option_types_found);
if (status == PUSH_MSG_ERROR)
msg (D_PUSH_ERRORS, "WARNING: Received bad push/pull message: %s", BSTR (buffer));
else if (status == PUSH_MSG_REPLY)
{
do_up (c, true, option_types_found); /* delay bringing tun/tap up until --push parms received from remote */
event_timeout_clear (&c->c2.push_request_interval);
}
gc_free (&gc);
}
bool
send_push_request (struct context *c)
{
return send_control_channel_string (c, "PUSH_REQUEST", D_PUSH);
}
#if P2MP_SERVER
bool
send_push_reply (struct context *c)
{
struct gc_arena gc = gc_new ();
struct buffer buf = alloc_buf_gc (MAX_PUSH_LIST_LEN + 256, &gc);
bool ret = false;
buf_printf (&buf, "PUSH_REPLY");
if (c->options.push_list && strlen (c->options.push_list->options))
buf_printf (&buf, ",%s", c->options.push_list->options);
if (c->c2.push_ifconfig_defined && c->c2.push_ifconfig_local && c->c2.push_ifconfig_remote_netmask)
buf_printf (&buf, ",ifconfig %s %s",
print_in_addr_t (c->c2.push_ifconfig_local, 0, &gc),
print_in_addr_t (c->c2.push_ifconfig_remote_netmask, 0, &gc));
if (strlen (BSTR (&buf)) < MAX_PUSH_LIST_LEN)
ret = send_control_channel_string (c, BSTR (&buf), D_PUSH);
else
msg (M_WARN, "Maximum length of --push buffer (%d) has been exceeded", MAX_PUSH_LIST_LEN);
gc_free (&gc);
return ret;
}
void
push_option (struct options *o, const char *opt, int msglevel)
{
int len;
bool first = false;
if (!string_class (opt, CC_ANY, CC_COMMA))
{
msg (msglevel, "PUSH OPTION FAILED (illegal comma (',') in string): '%s'", opt);
}
else
{
if (!o->push_list)
{
ALLOC_OBJ_CLEAR_GC (o->push_list, struct push_list, &o->gc);
first = true;
}
len = strlen (o->push_list->options);
if (len + strlen (opt) + 2 >= MAX_PUSH_LIST_LEN)
{
msg (msglevel, "Maximum length of --push buffer (%d) has been exceeded", MAX_PUSH_LIST_LEN);
}
else
{
if (!first)
strcat (o->push_list->options, ",");
strcat (o->push_list->options, opt);
}
}
}
void
push_options (struct options *o, char **p, int msglevel, struct gc_arena *gc)
{
const char **argv = make_extended_arg_array (p, gc);
char *opt = print_argv (argv, gc, 0);
push_option (o, opt, msglevel);
}
void
push_reset (struct options *o)
{
o->push_list = NULL;
}
#endif
int
process_incoming_push_msg (struct context *c,
const struct buffer *buffer,
bool honor_received_options,
unsigned int permission_mask,
unsigned int *option_types_found)
{
int ret = PUSH_MSG_ERROR;
struct buffer buf = *buffer;
#if P2MP_SERVER
if (buf_string_compare_advance (&buf, "PUSH_REQUEST"))
{
if (tls_authentication_status (c->c2.tls_multi, 0) == TLS_AUTHENTICATION_FAILED || c->c2.context_auth == CAS_FAILED)
{
send_auth_failed (c);
ret = PUSH_MSG_AUTH_FAILURE;
}
else if (!c->c2.push_reply_deferred && c->c2.context_auth == CAS_SUCCEEDED)
{
if (send_push_reply (c))
ret = PUSH_MSG_REQUEST;
}
else
{
ret = PUSH_MSG_REQUEST_DEFERRED;
}
}
else
#endif
if (honor_received_options && buf_string_compare_advance (&buf, "PUSH_REPLY"))
{
const uint8_t ch = buf_read_u8 (&buf);
if (ch == ',')
{
pre_pull_restore (&c->options);
c->c2.pulled_options_string = string_alloc (BSTR (&buf), &c->c2.gc);
if (apply_push_options (&c->options,
&buf,
permission_mask,
option_types_found,
c->c2.es))
ret = PUSH_MSG_REPLY;
}
else if (ch == '\0')
{
ret = PUSH_MSG_REPLY;
}
/* show_settings (&c->options); */
}
return ret;
}
#if P2MP_SERVER
/*
* Remove iroutes from the push_list.
*/
void
remove_iroutes_from_push_route_list (struct options *o)
{
if (o && o->push_list && o->iroutes)
{
struct gc_arena gc = gc_new ();
struct push_list *pl;
struct buffer in, out;
char *line;
bool first = true;
/* prepare input and output buffers */
ALLOC_OBJ_CLEAR_GC (pl, struct push_list, &gc);
ALLOC_ARRAY_CLEAR_GC (line, char, MAX_PUSH_LIST_LEN, &gc);
buf_set_read (&in, (const uint8_t*) o->push_list->options, strlen (o->push_list->options));
buf_set_write (&out, (uint8_t*) pl->options, sizeof (pl->options));
/* cycle through the push list */
while (buf_parse (&in, ',', line, MAX_PUSH_LIST_LEN))
{
char *p[MAX_PARMS];
bool copy = true;
/* parse the push item */
CLEAR (p);
if (parse_line (line, p, SIZE (p), "[PUSH_ROUTE_REMOVE]", 1, D_ROUTE_DEBUG, &gc))
{
/* is the push item a route directive? */
if (p[0] && !strcmp (p[0], "route") && !p[3])
{
/* get route parameters */
bool status1, status2;
const in_addr_t network = getaddr (GETADDR_HOST_ORDER, p[1], 0, &status1, NULL);
const in_addr_t netmask = getaddr (GETADDR_HOST_ORDER, p[2] ? p[2] : "255.255.255.255", 0, &status2, NULL);
/* did route parameters parse correctly? */
if (status1 && status2)
{
const struct iroute *ir;
/* does route match an iroute? */
for (ir = o->iroutes; ir != NULL; ir = ir->next)
{
if (network == ir->network && netmask == netbits_to_netmask (ir->netbits >= 0 ? ir->netbits : 32))
{
copy = false;
break;
}
}
}
}
}
/* should we copy the push item? */
if (copy)
{
if (!first)
buf_printf (&out, ",");
buf_printf (&out, "%s", line);
first = false;
}
else
msg (D_PUSH, "REMOVE PUSH ROUTE: '%s'", line);
}
#if 0
msg (M_INFO, "BEFORE: '%s'", o->push_list->options);
msg (M_INFO, "AFTER: '%s'", pl->options);
#endif
/* copy new push list back to options */
*o->push_list = *pl;
gc_free (&gc);
}
}
#endif
#endif