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putty/portfwd.c

1178 строки
35 KiB
C
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/*
* SSH port forwarding.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "putty.h"
#include "ssh.h"
#include "sshchan.h"
/*
* Enumeration of values that live in the 'socks_state' field of
* struct PortForwarding.
*/
typedef enum {
SOCKS_NONE, /* direct connection (no SOCKS, or SOCKS already done) */
SOCKS_INITIAL, /* don't know if we're SOCKS 4 or 5 yet */
SOCKS_4, /* expect a SOCKS 4 (or 4A) connection message */
SOCKS_5_INITIAL, /* expect a SOCKS 5 preliminary message */
SOCKS_5_CONNECT /* expect a SOCKS 5 connection message */
} SocksState;
typedef struct PortForwarding {
SshChannel *c; /* channel structure held by SSH connection layer */
ConnectionLayer *cl; /* the connection layer itself */
/* Note that ssh need not be filled in if c is non-NULL */
Socket *s;
bool input_wanted;
bool ready;
SocksState socks_state;
/*
* `hostname' and `port' are the real hostname and port, once
* we know what we're connecting to.
*/
char *hostname;
int port;
/*
* `socksbuf' is the buffer we use to accumulate the initial SOCKS
* segment of the incoming data, plus anything after that that we
* receive before we're ready to send data to the SSH server.
*/
strbuf *socksbuf;
size_t socksbuf_consumed;
Plug plug;
Channel chan;
} PortForwarding;
struct PortListener {
ConnectionLayer *cl;
Socket *s;
bool is_dynamic;
/*
* `hostname' and `port' are the real hostname and port, for
* ordinary forwardings.
*/
char *hostname;
int port;
Plug plug;
};
static struct PortForwarding *new_portfwd_state(void)
{
struct PortForwarding *pf = snew(struct PortForwarding);
pf->hostname = NULL;
pf->socksbuf = NULL;
return pf;
}
static void free_portfwd_state(struct PortForwarding *pf)
{
if (!pf)
return;
sfree(pf->hostname);
if (pf->socksbuf)
strbuf_free(pf->socksbuf);
sfree(pf);
}
static struct PortListener *new_portlistener_state(void)
{
struct PortListener *pl = snew(struct PortListener);
pl->hostname = NULL;
return pl;
}
static void free_portlistener_state(struct PortListener *pl)
{
if (!pl)
return;
sfree(pl->hostname);
sfree(pl);
}
static void pfd_log(Plug *plug, PlugLogType type, SockAddr *addr, int port,
const char *error_msg, int error_code)
{
/* we have to dump these since we have no interface to logging.c */
}
static void pfl_log(Plug *plug, PlugLogType type, SockAddr *addr, int port,
const char *error_msg, int error_code)
{
/* we have to dump these since we have no interface to logging.c */
}
static void pfd_close(struct PortForwarding *pf);
static void pfd_closing(Plug *plug, const char *error_msg, int error_code,
bool calling_back)
{
struct PortForwarding *pf =
container_of(plug, struct PortForwarding, plug);
if (error_msg) {
/*
* Socket error. Slam the connection instantly shut.
*/
if (pf->c) {
sshfwd_initiate_close(pf->c, error_msg);
} else {
/*
* We might not have an SSH channel, if a socket error
* occurred during SOCKS negotiation. If not, we must
* clean ourself up without sshfwd_initiate_close's call
* back to pfd_close.
*/
pfd_close(pf);
}
} else {
/*
* Ordinary EOF received on socket. Send an EOF on the SSH
* channel.
*/
if (pf->c)
sshfwd_write_eof(pf->c);
}
}
static void pfl_terminate(struct PortListener *pl);
static void pfl_closing(Plug *plug, const char *error_msg, int error_code,
bool calling_back)
{
struct PortListener *pl = (struct PortListener *) plug;
pfl_terminate(pl);
}
static SshChannel *wrap_lportfwd_open(
ConnectionLayer *cl, const char *hostname, int port,
Socket *s, Channel *chan)
{
SocketPeerInfo *pi;
char *description;
SshChannel *toret;
pi = sk_peer_info(s);
if (pi && pi->log_text) {
description = dupprintf("forwarding from %s", pi->log_text);
} else {
description = dupstr("forwarding");
}
toret = ssh_lportfwd_open(cl, hostname, port, description, pi, chan);
sk_free_peer_info(pi);
sfree(description);
return toret;
}
static char *ipv4_to_string(unsigned ipv4)
{
return dupprintf("%u.%u.%u.%u",
(ipv4 >> 24) & 0xFF, (ipv4 >> 16) & 0xFF,
(ipv4 >> 8) & 0xFF, (ipv4 ) & 0xFF);
}
static char *ipv6_to_string(ptrlen ipv6)
{
const unsigned char *addr = ipv6.ptr;
assert(ipv6.len == 16);
return dupprintf("%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
(unsigned)GET_16BIT_MSB_FIRST(addr + 0),
(unsigned)GET_16BIT_MSB_FIRST(addr + 2),
(unsigned)GET_16BIT_MSB_FIRST(addr + 4),
(unsigned)GET_16BIT_MSB_FIRST(addr + 6),
(unsigned)GET_16BIT_MSB_FIRST(addr + 8),
(unsigned)GET_16BIT_MSB_FIRST(addr + 10),
(unsigned)GET_16BIT_MSB_FIRST(addr + 12),
(unsigned)GET_16BIT_MSB_FIRST(addr + 14));
}
static void pfd_receive(Plug *plug, int urgent, const char *data, size_t len)
{
struct PortForwarding *pf =
container_of(plug, struct PortForwarding, plug);
if (len == 0)
return;
if (pf->socks_state != SOCKS_NONE) {
BinarySource src[1];
/*
* Store all the data we've got in socksbuf.
*/
put_data(pf->socksbuf, data, len);
/*
* Check the start of socksbuf to see if it's a valid and
* complete message in the SOCKS exchange.
*/
if (pf->socks_state == SOCKS_INITIAL) {
/* Preliminary: check the first byte of the data (which we
* _must_ have by now) to find out which SOCKS major
* version we're speaking. */
switch (pf->socksbuf->u[0]) {
case 4:
pf->socks_state = SOCKS_4;
break;
case 5:
pf->socks_state = SOCKS_5_INITIAL;
break;
default:
pfd_close(pf); /* unrecognised version */
return;
}
}
BinarySource_BARE_INIT(src, pf->socksbuf->u, pf->socksbuf->len);
get_data(src, pf->socksbuf_consumed);
while (pf->socks_state != SOCKS_NONE) {
unsigned socks_version, message_type, reserved_byte;
unsigned reply_code, port, ipv4, method;
ptrlen methods;
const char *socks4_hostname;
strbuf *output;
switch (pf->socks_state) {
case SOCKS_INITIAL:
case SOCKS_NONE:
unreachable("These case values cannot appear");
case SOCKS_4:
/* SOCKS 4/4A connect message */
socks_version = get_byte(src);
message_type = get_byte(src);
if (get_err(src) == BSE_OUT_OF_DATA)
return;
if (socks_version == 4 && message_type == 1) {
/* CONNECT message */
bool name_based = false;
port = get_uint16(src);
ipv4 = get_uint32(src);
if (ipv4 > 0x00000000 && ipv4 < 0x00000100) {
/*
* Addresses in this range indicate the SOCKS 4A
* extension to specify a hostname, which comes
* after the username.
*/
name_based = true;
}
get_asciz(src); /* skip username */
socks4_hostname = name_based ? get_asciz(src) : NULL;
if (get_err(src) == BSE_OUT_OF_DATA)
return;
if (get_err(src))
goto socks4_reject;
pf->port = port;
if (name_based) {
pf->hostname = dupstr(socks4_hostname);
} else {
pf->hostname = ipv4_to_string(ipv4);
}
output = strbuf_new();
put_byte(output, 0); /* reply version */
put_byte(output, 90); /* SOCKS 4 'request granted' */
put_uint16(output, 0); /* null port field */
put_uint32(output, 0); /* null address field */
sk_write(pf->s, output->u, output->len);
strbuf_free(output);
pf->socks_state = SOCKS_NONE;
pf->socksbuf_consumed = src->pos;
break;
}
socks4_reject:
output = strbuf_new();
put_byte(output, 0); /* reply version */
put_byte(output, 91); /* SOCKS 4 'request rejected' */
put_uint16(output, 0); /* null port field */
put_uint32(output, 0); /* null address field */
sk_write(pf->s, output->u, output->len);
strbuf_free(output);
pfd_close(pf);
return;
case SOCKS_5_INITIAL:
/* SOCKS 5 initial method list */
socks_version = get_byte(src);
methods = get_pstring(src);
method = 0xFF; /* means 'no usable method found' */
{
int i;
for (i = 0; i < methods.len; i++) {
if (((const unsigned char *)methods.ptr)[i] == 0 ) {
method = 0; /* no auth */
break;
}
}
}
if (get_err(src) == BSE_OUT_OF_DATA)
return;
if (get_err(src))
method = 0xFF;
output = strbuf_new();
put_byte(output, 5); /* SOCKS version */
put_byte(output, method); /* selected auth method */
sk_write(pf->s, output->u, output->len);
strbuf_free(output);
if (method == 0xFF) {
pfd_close(pf);
return;
}
pf->socks_state = SOCKS_5_CONNECT;
pf->socksbuf_consumed = src->pos;
break;
case SOCKS_5_CONNECT:
/* SOCKS 5 connect message */
socks_version = get_byte(src);
message_type = get_byte(src);
reserved_byte = get_byte(src);
if (socks_version == 5 && message_type == 1 &&
reserved_byte == 0) {
reply_code = 0; /* success */
switch (get_byte(src)) {
case 1: /* IPv4 */
pf->hostname = ipv4_to_string(get_uint32(src));
break;
case 4: /* IPv6 */
pf->hostname = ipv6_to_string(get_data(src, 16));
break;
case 3: /* unresolved domain name */
pf->hostname = mkstr(get_pstring(src));
break;
default:
pf->hostname = NULL;
reply_code = 8; /* address type not supported */
break;
}
pf->port = get_uint16(src);
} else {
reply_code = 7; /* command not supported */
}
if (get_err(src) == BSE_OUT_OF_DATA)
return;
if (get_err(src))
reply_code = 1; /* general server failure */
output = strbuf_new();
put_byte(output, 5); /* SOCKS version */
put_byte(output, reply_code);
put_byte(output, 0); /* reserved */
put_byte(output, 1); /* IPv4 address follows */
put_uint32(output, 0); /* bound IPv4 address (unused) */
put_uint16(output, 0); /* bound port number (unused) */
sk_write(pf->s, output->u, output->len);
strbuf_free(output);
if (reply_code != 0) {
pfd_close(pf);
return;
}
pf->socks_state = SOCKS_NONE;
pf->socksbuf_consumed = src->pos;
break;
}
}
/*
* We come here when we're ready to make an actual
* connection.
*/
/*
* Freeze the socket until the SSH server confirms the
* connection.
*/
sk_set_frozen(pf->s, true);
pf->c = wrap_lportfwd_open(pf->cl, pf->hostname, pf->port, pf->s,
&pf->chan);
}
if (pf->ready)
sshfwd_write(pf->c, data, len);
}
static void pfd_sent(Plug *plug, size_t bufsize)
{
struct PortForwarding *pf =
container_of(plug, struct PortForwarding, plug);
if (pf->c)
sshfwd_unthrottle(pf->c, bufsize);
}
static const PlugVtable PortForwarding_plugvt = {
pfd_log,
pfd_closing,
pfd_receive,
pfd_sent,
NULL
};
static void pfd_chan_free(Channel *chan);
static void pfd_open_confirmation(Channel *chan);
static void pfd_open_failure(Channel *chan, const char *errtext);
static size_t pfd_send(
Channel *chan, bool is_stderr, const void *data, size_t len);
static void pfd_send_eof(Channel *chan);
static void pfd_set_input_wanted(Channel *chan, bool wanted);
static char *pfd_log_close_msg(Channel *chan);
static const struct ChannelVtable PortForwarding_channelvt = {
pfd_chan_free,
pfd_open_confirmation,
pfd_open_failure,
pfd_send,
pfd_send_eof,
pfd_set_input_wanted,
pfd_log_close_msg,
chan_default_want_close,
chan_no_exit_status,
chan_no_exit_signal,
chan_no_exit_signal_numeric,
chan_no_run_shell,
chan_no_run_command,
chan_no_run_subsystem,
chan_no_enable_x11_forwarding,
chan_no_enable_agent_forwarding,
chan_no_allocate_pty,
chan_no_set_env,
chan_no_send_break,
chan_no_send_signal,
chan_no_change_window_size,
chan_no_request_response,
};
Channel *portfwd_raw_new(ConnectionLayer *cl, Plug **plug, bool start_ready)
{
struct PortForwarding *pf;
pf = new_portfwd_state();
pf->plug.vt = &PortForwarding_plugvt;
pf->chan.initial_fixed_window_size = 0;
pf->chan.vt = &PortForwarding_channelvt;
pf->input_wanted = true;
pf->c = NULL;
pf->cl = cl;
pf->input_wanted = true;
pf->ready = start_ready;
pf->socks_state = SOCKS_NONE;
pf->hostname = NULL;
pf->port = 0;
*plug = &pf->plug;
return &pf->chan;
}
void portfwd_raw_free(Channel *pfchan)
{
struct PortForwarding *pf;
assert(pfchan->vt == &PortForwarding_channelvt);
pf = container_of(pfchan, struct PortForwarding, chan);
free_portfwd_state(pf);
}
void portfwd_raw_setup(Channel *pfchan, Socket *s, SshChannel *sc)
{
struct PortForwarding *pf;
assert(pfchan->vt == &PortForwarding_channelvt);
pf = container_of(pfchan, struct PortForwarding, chan);
pf->s = s;
pf->c = sc;
}
/*
called when someone connects to the local port
*/
static int pfl_accepting(Plug *p, accept_fn_t constructor, accept_ctx_t ctx)
{
struct PortListener *pl = container_of(p, struct PortListener, plug);
struct PortForwarding *pf;
Channel *chan;
Plug *plug;
Socket *s;
const char *err;
chan = portfwd_raw_new(pl->cl, &plug, false);
s = constructor(ctx, plug);
if ((err = sk_socket_error(s)) != NULL) {
portfwd_raw_free(chan);
return 1;
}
pf = container_of(chan, struct PortForwarding, chan);
if (pl->is_dynamic) {
pf->s = s;
pf->socks_state = SOCKS_INITIAL;
pf->socksbuf = strbuf_new();
pf->socksbuf_consumed = 0;
pf->port = 0; /* "hostname" buffer is so far empty */
sk_set_frozen(s, false); /* we want to receive SOCKS _now_! */
} else {
pf->hostname = dupstr(pl->hostname);
pf->port = pl->port;
portfwd_raw_setup(
chan, s,
wrap_lportfwd_open(pl->cl, pf->hostname, pf->port, s, &pf->chan));
}
return 0;
}
static const PlugVtable PortListener_plugvt = {
pfl_log,
pfl_closing,
NULL, /* recv */
NULL, /* send */
pfl_accepting
};
/*
* Add a new port-forwarding listener from srcaddr:port -> desthost:destport.
*
* desthost == NULL indicates dynamic SOCKS port forwarding.
*
* On success, returns NULL and fills in *pl_ret. On error, returns a
* dynamically allocated error message string.
*/
static char *pfl_listen(const char *desthost, int destport,
const char *srcaddr, int port,
ConnectionLayer *cl, Conf *conf,
struct PortListener **pl_ret, int address_family)
{
const char *err;
struct PortListener *pl;
/*
* Open socket.
*/
pl = *pl_ret = new_portlistener_state();
pl->plug.vt = &PortListener_plugvt;
if (desthost) {
pl->hostname = dupstr(desthost);
pl->port = destport;
pl->is_dynamic = false;
} else
pl->is_dynamic = true;
pl->cl = cl;
pl->s = new_listener(srcaddr, port, &pl->plug,
!conf_get_bool(conf, CONF_lport_acceptall),
conf, address_family);
if ((err = sk_socket_error(pl->s)) != NULL) {
char *err_ret = dupstr(err);
sk_close(pl->s);
free_portlistener_state(pl);
*pl_ret = NULL;
return err_ret;
}
return NULL;
}
static char *pfd_log_close_msg(Channel *chan)
{
return dupstr("Forwarded port closed");
}
static void pfd_close(struct PortForwarding *pf)
{
if (!pf)
return;
sk_close(pf->s);
free_portfwd_state(pf);
}
/*
* Terminate a listener.
*/
static void pfl_terminate(struct PortListener *pl)
{
if (!pl)
return;
sk_close(pl->s);
free_portlistener_state(pl);
}
static void pfd_set_input_wanted(Channel *chan, bool wanted)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
pf->input_wanted = wanted;
sk_set_frozen(pf->s, !pf->input_wanted);
}
static void pfd_chan_free(Channel *chan)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
pfd_close(pf);
}
/*
* Called to send data down the raw connection.
*/
static size_t pfd_send(
Channel *chan, bool is_stderr, const void *data, size_t len)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
return sk_write(pf->s, data, len);
}
static void pfd_send_eof(Channel *chan)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
sk_write_eof(pf->s);
}
static void pfd_open_confirmation(Channel *chan)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
pf->ready = true;
sk_set_frozen(pf->s, false);
sk_write(pf->s, NULL, 0);
if (pf->socksbuf) {
sshfwd_write(pf->c, pf->socksbuf->u + pf->socksbuf_consumed,
pf->socksbuf->len - pf->socksbuf_consumed);
strbuf_free(pf->socksbuf);
pf->socksbuf = NULL;
}
}
static void pfd_open_failure(Channel *chan, const char *errtext)
{
assert(chan->vt == &PortForwarding_channelvt);
PortForwarding *pf = container_of(chan, PortForwarding, chan);
logeventf(pf->cl->logctx,
"Forwarded connection refused by remote%s%s",
errtext ? ": " : "", errtext ? errtext : "");
}
/* ----------------------------------------------------------------------
* Code to manage the complete set of currently active port
* forwardings, and update it from Conf.
*/
struct PortFwdRecord {
enum { DESTROY, KEEP, CREATE } status;
int type;
unsigned sport, dport;
char *saddr, *daddr;
char *sserv, *dserv;
struct ssh_rportfwd *remote;
int addressfamily;
struct PortListener *local;
};
static int pfr_cmp(void *av, void *bv)
{
PortFwdRecord *a = (PortFwdRecord *) av;
PortFwdRecord *b = (PortFwdRecord *) bv;
int i;
if (a->type > b->type)
return +1;
if (a->type < b->type)
return -1;
if (a->addressfamily > b->addressfamily)
return +1;
if (a->addressfamily < b->addressfamily)
return -1;
if ( (i = nullstrcmp(a->saddr, b->saddr)) != 0)
return i < 0 ? -1 : +1;
if (a->sport > b->sport)
return +1;
if (a->sport < b->sport)
return -1;
if (a->type != 'D') {
if ( (i = nullstrcmp(a->daddr, b->daddr)) != 0)
return i < 0 ? -1 : +1;
if (a->dport > b->dport)
return +1;
if (a->dport < b->dport)
return -1;
}
return 0;
}
static void pfr_free(PortFwdRecord *pfr)
{
/* Dispose of any listening socket. */
if (pfr->local)
pfl_terminate(pfr->local);
sfree(pfr->saddr);
sfree(pfr->daddr);
sfree(pfr->sserv);
sfree(pfr->dserv);
sfree(pfr);
}
struct PortFwdManager {
ConnectionLayer *cl;
Conf *conf;
tree234 *forwardings;
};
PortFwdManager *portfwdmgr_new(ConnectionLayer *cl)
{
PortFwdManager *mgr = snew(PortFwdManager);
mgr->cl = cl;
mgr->conf = NULL;
mgr->forwardings = newtree234(pfr_cmp);
return mgr;
}
void portfwdmgr_close(PortFwdManager *mgr, PortFwdRecord *pfr)
{
PortFwdRecord *realpfr = del234(mgr->forwardings, pfr);
if (realpfr == pfr)
pfr_free(pfr);
}
void portfwdmgr_close_all(PortFwdManager *mgr)
{
PortFwdRecord *pfr;
while ((pfr = delpos234(mgr->forwardings, 0)) != NULL)
pfr_free(pfr);
}
void portfwdmgr_free(PortFwdManager *mgr)
{
portfwdmgr_close_all(mgr);
freetree234(mgr->forwardings);
if (mgr->conf)
conf_free(mgr->conf);
sfree(mgr);
}
void portfwdmgr_config(PortFwdManager *mgr, Conf *conf)
{
PortFwdRecord *pfr;
int i;
char *key, *val;
if (mgr->conf)
conf_free(mgr->conf);
mgr->conf = conf_copy(conf);
/*
* Go through the existing port forwardings and tag them
* with status==DESTROY. Any that we want to keep will be
* re-enabled (status==KEEP) as we go through the
* configuration and find out which bits are the same as
* they were before.
*/
for (i = 0; (pfr = index234(mgr->forwardings, i)) != NULL; i++)
pfr->status = DESTROY;
for (val = conf_get_str_strs(conf, CONF_portfwd, NULL, &key);
val != NULL;
val = conf_get_str_strs(conf, CONF_portfwd, key, &key)) {
char *kp, *kp2, *vp, *vp2;
char address_family, type;
int sport, dport, sserv, dserv;
char *sports, *dports, *saddr, *host;
kp = key;
address_family = 'A';
type = 'L';
if (*kp == 'A' || *kp == '4' || *kp == '6')
address_family = *kp++;
if (*kp == 'L' || *kp == 'R')
type = *kp++;
if ((kp2 = host_strchr(kp, ':')) != NULL) {
/*
* There's a colon in the middle of the source port
* string, which means that the part before it is
* actually a source address.
*/
char *saddr_tmp = dupprintf("%.*s", (int)(kp2 - kp), kp);
saddr = host_strduptrim(saddr_tmp);
sfree(saddr_tmp);
sports = kp2+1;
} else {
saddr = NULL;
sports = kp;
}
sport = atoi(sports);
sserv = 0;
if (sport == 0) {
sserv = 1;
sport = net_service_lookup(sports);
if (!sport) {
logeventf(mgr->cl->logctx, "Service lookup failed for source"
" port \"%s\"", sports);
}
}
if (type == 'L' && !strcmp(val, "D")) {
/* dynamic forwarding */
host = NULL;
dports = NULL;
dport = -1;
dserv = 0;
type = 'D';
} else {
/* ordinary forwarding */
vp = val;
vp2 = vp + host_strcspn(vp, ":");
host = dupprintf("%.*s", (int)(vp2 - vp), vp);
if (*vp2)
vp2++;
dports = vp2;
dport = atoi(dports);
dserv = 0;
if (dport == 0) {
dserv = 1;
dport = net_service_lookup(dports);
if (!dport) {
logeventf(mgr->cl->logctx,
"Service lookup failed for destination"
" port \"%s\"", dports);
}
}
}
if (sport && dport) {
/* Set up a description of the source port. */
pfr = snew(PortFwdRecord);
pfr->type = type;
pfr->saddr = saddr;
pfr->sserv = sserv ? dupstr(sports) : NULL;
pfr->sport = sport;
pfr->daddr = host;
pfr->dserv = dserv ? dupstr(dports) : NULL;
pfr->dport = dport;
pfr->local = NULL;
pfr->remote = NULL;
pfr->addressfamily = (address_family == '4' ? ADDRTYPE_IPV4 :
address_family == '6' ? ADDRTYPE_IPV6 :
ADDRTYPE_UNSPEC);
PortFwdRecord *existing = add234(mgr->forwardings, pfr);
if (existing != pfr) {
if (existing->status == DESTROY) {
/*
* We already have a port forwarding up and running
* with precisely these parameters. Hence, no need
* to do anything; simply re-tag the existing one
* as KEEP.
*/
existing->status = KEEP;
}
/*
* Anything else indicates that there was a duplicate
* in our input, which we'll silently ignore.
*/
pfr_free(pfr);
} else {
pfr->status = CREATE;
}
} else {
sfree(saddr);
sfree(host);
}
}
/*
* Now go through and destroy any port forwardings which were
* not re-enabled.
*/
for (i = 0; (pfr = index234(mgr->forwardings, i)) != NULL; i++) {
if (pfr->status == DESTROY) {
char *message;
message = dupprintf("%s port forwarding from %s%s%d",
pfr->type == 'L' ? "local" :
pfr->type == 'R' ? "remote" : "dynamic",
pfr->saddr ? pfr->saddr : "",
pfr->saddr ? ":" : "",
pfr->sport);
if (pfr->type != 'D') {
char *msg2 = dupprintf("%s to %s:%d", message,
pfr->daddr, pfr->dport);
sfree(message);
message = msg2;
}
logeventf(mgr->cl->logctx, "Cancelling %s", message);
sfree(message);
/* pfr->remote or pfr->local may be NULL if setting up a
* forwarding failed. */
if (pfr->remote) {
/*
* Cancel the port forwarding at the server
* end.
*
* Actually closing the listening port on the server
* side may fail - because in SSH-1 there's no message
* in the protocol to request it!
*
* Instead, we simply remove the record of the
* forwarding from our local end, so that any
* connections the server tries to make on it are
* rejected.
*/
ssh_rportfwd_remove(mgr->cl, pfr->remote);
pfr->remote = NULL;
} else if (pfr->local) {
pfl_terminate(pfr->local);
pfr->local = NULL;
}
delpos234(mgr->forwardings, i);
pfr_free(pfr);
i--; /* so we don't skip one in the list */
}
}
/*
* And finally, set up any new port forwardings (status==CREATE).
*/
for (i = 0; (pfr = index234(mgr->forwardings, i)) != NULL; i++) {
if (pfr->status == CREATE) {
char *sportdesc, *dportdesc;
sportdesc = dupprintf("%s%s%s%s%d%s",
pfr->saddr ? pfr->saddr : "",
pfr->saddr ? ":" : "",
pfr->sserv ? pfr->sserv : "",
pfr->sserv ? "(" : "",
pfr->sport,
pfr->sserv ? ")" : "");
if (pfr->type == 'D') {
dportdesc = NULL;
} else {
dportdesc = dupprintf("%s:%s%s%d%s",
pfr->daddr,
pfr->dserv ? pfr->dserv : "",
pfr->dserv ? "(" : "",
pfr->dport,
pfr->dserv ? ")" : "");
}
if (pfr->type == 'L') {
char *err = pfl_listen(pfr->daddr, pfr->dport,
pfr->saddr, pfr->sport,
mgr->cl, conf, &pfr->local,
pfr->addressfamily);
logeventf(mgr->cl->logctx,
"Local %sport %s forwarding to %s%s%s",
pfr->addressfamily == ADDRTYPE_IPV4 ? "IPv4 " :
pfr->addressfamily == ADDRTYPE_IPV6 ? "IPv6 " : "",
sportdesc, dportdesc,
err ? " failed: " : "", err ? err : "");
if (err)
sfree(err);
} else if (pfr->type == 'D') {
char *err = pfl_listen(NULL, -1, pfr->saddr, pfr->sport,
mgr->cl, conf, &pfr->local,
pfr->addressfamily);
logeventf(mgr->cl->logctx,
"Local %sport %s SOCKS dynamic forwarding%s%s",
pfr->addressfamily == ADDRTYPE_IPV4 ? "IPv4 " :
pfr->addressfamily == ADDRTYPE_IPV6 ? "IPv6 " : "",
sportdesc,
err ? " failed: " : "", err ? err : "");
if (err)
sfree(err);
} else {
const char *shost;
if (pfr->saddr) {
shost = pfr->saddr;
} else if (conf_get_bool(conf, CONF_rport_acceptall)) {
shost = "";
} else {
shost = "localhost";
}
pfr->remote = ssh_rportfwd_alloc(
mgr->cl, shost, pfr->sport, pfr->daddr, pfr->dport,
pfr->addressfamily, sportdesc, pfr, NULL);
if (!pfr->remote) {
logeventf(mgr->cl->logctx,
"Duplicate remote port forwarding to %s:%d",
pfr->daddr, pfr->dport);
pfr_free(pfr);
} else {
logeventf(mgr->cl->logctx, "Requesting remote port %s"
" forward to %s", sportdesc, dportdesc);
}
}
sfree(sportdesc);
sfree(dportdesc);
}
}
}
bool portfwdmgr_listen(PortFwdManager *mgr, const char *host, int port,
const char *keyhost, int keyport, Conf *conf)
{
PortFwdRecord *pfr;
pfr = snew(PortFwdRecord);
pfr->type = 'L';
pfr->saddr = host ? dupstr(host) : NULL;
pfr->daddr = keyhost ? dupstr(keyhost) : NULL;
pfr->sserv = pfr->dserv = NULL;
pfr->sport = port;
pfr->dport = keyport;
pfr->local = NULL;
pfr->remote = NULL;
pfr->addressfamily = ADDRTYPE_UNSPEC;
PortFwdRecord *existing = add234(mgr->forwardings, pfr);
if (existing != pfr) {
/*
* We had this record already. Return failure.
*/
pfr_free(pfr);
return false;
}
char *err = pfl_listen(keyhost, keyport, host, port,
mgr->cl, conf, &pfr->local, pfr->addressfamily);
logeventf(mgr->cl->logctx,
"%s on port %s:%d to forward to client%s%s",
err ? "Failed to listen" : "Listening", host, port,
err ? ": " : "", err ? err : "");
if (err) {
sfree(err);
del234(mgr->forwardings, pfr);
pfr_free(pfr);
return false;
}
return true;
}
bool portfwdmgr_unlisten(PortFwdManager *mgr, const char *host, int port)
{
PortFwdRecord pfr_key;
pfr_key.type = 'L';
/* Safe to cast the const away here, because it will only be used
* by pfr_cmp, which won't write to the string */
pfr_key.saddr = pfr_key.daddr = (char *)host;
pfr_key.sserv = pfr_key.dserv = NULL;
pfr_key.sport = pfr_key.dport = port;
pfr_key.local = NULL;
pfr_key.remote = NULL;
pfr_key.addressfamily = ADDRTYPE_UNSPEC;
PortFwdRecord *pfr = del234(mgr->forwardings, &pfr_key);
if (!pfr)
return false;
logeventf(mgr->cl->logctx, "Closing listening port %s:%d", host, port);
pfr_free(pfr);
return true;
}
/*
* Called when receiving a PORT OPEN from the server to make a
* connection to a destination host.
*
* On success, returns NULL and fills in *pf_ret. On error, returns a
* dynamically allocated error message string.
*/
char *portfwdmgr_connect(PortFwdManager *mgr, Channel **chan_ret,
char *hostname, int port, SshChannel *c,
int addressfamily)
{
SockAddr *addr;
const char *err;
char *dummy_realhost = NULL;
struct PortForwarding *pf;
/*
* Try to find host.
*/
addr = name_lookup(hostname, port, &dummy_realhost, mgr->conf,
addressfamily, NULL, NULL);
if ((err = sk_addr_error(addr)) != NULL) {
char *err_ret = dupstr(err);
sk_addr_free(addr);
sfree(dummy_realhost);
return err_ret;
}
/*
* Open socket.
*/
pf = new_portfwd_state();
*chan_ret = &pf->chan;
pf->plug.vt = &PortForwarding_plugvt;
pf->chan.initial_fixed_window_size = 0;
pf->chan.vt = &PortForwarding_channelvt;
pf->input_wanted = true;
pf->ready = true;
pf->c = c;
pf->cl = mgr->cl;
pf->socks_state = SOCKS_NONE;
pf->s = new_connection(addr, dummy_realhost, port,
false, true, false, false, &pf->plug, mgr->conf);
sfree(dummy_realhost);
if ((err = sk_socket_error(pf->s)) != NULL) {
char *err_ret = dupstr(err);
sk_close(pf->s);
free_portfwd_state(pf);
*chan_ret = NULL;
return err_ret;
}
return NULL;
}
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