* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
- *
* SSH2 support added by Markus Friedl.
- * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
+ * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
* Copyright (c) 1999 Dug Song. All rights reserved.
* Copyright (c) 1999 Theo de Raadt. All rights reserved.
*
*/
#include "includes.h"
-RCSID("$OpenBSD: channels.c,v 1.122 2001/06/03 14:55:38 markus Exp $");
+RCSID("$OpenBSD: channels.c,v 1.159 2002/01/14 13:55:55 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
#include "canohost.h"
#include "key.h"
#include "authfd.h"
+#include "pathnames.h"
/* -- channel core */
static char *auth_sock_name = NULL;
static char *auth_sock_dir = NULL;
-
/* AF_UNSPEC or AF_INET or AF_INET6 */
-extern int IPv4or6;
+static int IPv4or6 = AF_UNSPEC;
/* helper */
-void port_open_helper(Channel *c, char *rtype);
+static void port_open_helper(Channel *c, char *rtype);
/* -- channel core */
* when the channel consumer/producer is ready, e.g. shell exec'd
*/
-void
+static void
channel_register_fds(Channel *c, int rfd, int wfd, int efd,
int extusage, int nonblock)
{
/* Do initial allocation if this is the first call. */
if (channels_alloc == 0) {
- chan_init();
channels_alloc = 10;
channels = xmalloc(channels_alloc * sizeof(Channel *));
for (i = 0; i < channels_alloc; i++)
channels[i] = NULL;
- /*
- * Kludge: arrange a call to channel_stop_listening if we
- * terminate with fatal().
- */
- fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
+ fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
}
/* Try to find a free slot where to put the new channel. */
for (found = -1, i = 0; i < channels_alloc; i++)
}
/* Initialize and return new channel. */
c = channels[found] = xmalloc(sizeof(Channel));
+ memset(c, 0, sizeof(Channel));
buffer_init(&c->input);
buffer_init(&c->output);
buffer_init(&c->extended);
- chan_init_iostates(c);
+ c->ostate = CHAN_OUTPUT_OPEN;
+ c->istate = CHAN_INPUT_OPEN;
+ c->flags = 0;
channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
c->self = found;
c->type = type;
c->cb_fn = NULL;
c->cb_arg = NULL;
c->cb_event = 0;
- c->dettach_user = NULL;
+ c->force_drain = 0;
+ c->single_connection = 0;
+ c->detach_user = NULL;
c->input_filter = NULL;
debug("channel %d: new [%s]", found, remote_name);
return c;
}
+static int
+channel_find_maxfd(void)
+{
+ int i, max = 0;
+ Channel *c;
+
+ for (i = 0; i < channels_alloc; i++) {
+ c = channels[i];
+ if (c != NULL) {
+ max = MAX(max, c->rfd);
+ max = MAX(max, c->wfd);
+ max = MAX(max, c->efd);
+ }
+ }
+ return max;
+}
+
+int
+channel_close_fd(int *fdp)
+{
+ int ret = 0, fd = *fdp;
+
+ if (fd != -1) {
+ ret = close(fd);
+ *fdp = -1;
+ if (fd == channel_max_fd)
+ channel_max_fd = channel_find_maxfd();
+ }
+ return ret;
+}
+
/* Close all channel fd/socket. */
-void
+static void
channel_close_fds(Channel *c)
{
debug3("channel_close_fds: channel %d: r %d w %d e %d",
c->self, c->rfd, c->wfd, c->efd);
- if (c->sock != -1) {
- close(c->sock);
- c->sock = -1;
- }
- if (c->rfd != -1) {
- close(c->rfd);
- c->rfd = -1;
- }
- if (c->wfd != -1) {
- close(c->wfd);
- c->wfd = -1;
- }
- if (c->efd != -1) {
- close(c->efd);
- c->efd = -1;
- }
+ channel_close_fd(&c->sock);
+ channel_close_fd(&c->rfd);
+ channel_close_fd(&c->wfd);
+ channel_close_fd(&c->efd);
}
/* Free the channel and close its fd/socket. */
debug3("channel_free: status: %s", s);
xfree(s);
- if (c->dettach_user != NULL) {
- debug("channel_free: channel %d: dettaching channel user", c->self);
- c->dettach_user(c->self, NULL);
- }
if (c->sock != -1)
shutdown(c->sock, SHUT_RDWR);
channel_close_fds(c);
xfree(c);
}
+void
+channel_free_all(void)
+{
+ int i;
+
+ for (i = 0; i < channels_alloc; i++)
+ if (channels[i] != NULL)
+ channel_free(channels[i]);
+}
+
+/*
+ * Closes the sockets/fds of all channels. This is used to close extra file
+ * descriptors after a fork.
+ */
+
+void
+channel_close_all(void)
+{
+ int i;
+
+ for (i = 0; i < channels_alloc; i++)
+ if (channels[i] != NULL)
+ channel_close_fds(channels[i]);
+}
/*
- * Stops listening for channels, and removes any unix domain sockets that we
- * might have.
+ * Stop listening to channels.
*/
void
-channel_stop_listening()
+channel_stop_listening(void)
{
int i;
Channel *c;
if (c != NULL) {
switch (c->type) {
case SSH_CHANNEL_AUTH_SOCKET:
- close(c->sock);
- unlink(c->path);
- channel_free(c);
- break;
case SSH_CHANNEL_PORT_LISTENER:
case SSH_CHANNEL_RPORT_LISTENER:
case SSH_CHANNEL_X11_LISTENER:
- close(c->sock);
+ channel_close_fd(&c->sock);
channel_free(c);
break;
- default:
- break;
}
}
}
}
-/*
- * Closes the sockets/fds of all channels. This is used to close extra file
- * descriptors after a fork.
- */
-
-void
-channel_close_all()
-{
- int i;
-
- for (i = 0; i < channels_alloc; i++)
- if (channels[i] != NULL)
- channel_close_fds(channels[i]);
-}
-
/*
* Returns true if no channel has too much buffered data, and false if one or
* more channel is overfull.
*/
int
-channel_not_very_much_buffered_data()
+channel_not_very_much_buffered_data(void)
{
u_int i;
Channel *c;
for (i = 0; i < channels_alloc; i++) {
c = channels[i];
if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
- if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
+#if 0
+ if (!compat20 &&
+ buffer_len(&c->input) > packet_get_maxsize()) {
debug("channel %d: big input buffer %d",
c->self, buffer_len(&c->input));
return 0;
}
+#endif
if (buffer_len(&c->output) > packet_get_maxsize()) {
- debug("channel %d: big output buffer %d",
- c->self, buffer_len(&c->output));
+ debug("channel %d: big output buffer %d > %d",
+ c->self, buffer_len(&c->output),
+ packet_get_maxsize());
return 0;
}
}
/* Returns true if any channel is still open. */
int
-channel_still_open()
+channel_still_open(void)
{
int i;
Channel *c;
/* Returns the id of an open channel suitable for keepaliving */
int
-channel_find_open()
+channel_find_open(void)
{
int i;
Channel *c;
*/
char *
-channel_open_message()
+channel_open_message(void)
{
Buffer buffer;
Channel *c;
log("channel_register_cleanup: %d: bad id", id);
return;
}
- c->dettach_user = fn;
+ c->detach_user = fn;
}
void
channel_cancel_cleanup(int id)
log("channel_cancel_cleanup: %d: bad id", id);
return;
}
- c->dettach_user = NULL;
+ c->detach_user = NULL;
}
void
channel_register_filter(int id, channel_filter_fn *fn)
chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
-void
+static void
channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
{
FD_SET(c->sock, readset);
}
-void
+static void
channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
{
debug3("channel %d: waiting for connection", c->self);
FD_SET(c->sock, writeset);
}
-void
+static void
channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->input) < packet_get_maxsize())
FD_SET(c->sock, writeset);
}
-void
-channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
+static void
+channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
{
- /* test whether sockets are 'alive' for read/write */
- if (c->istate == CHAN_INPUT_OPEN)
- if (buffer_len(&c->input) < packet_get_maxsize())
- FD_SET(c->sock, readset);
- if (c->ostate == CHAN_OUTPUT_OPEN ||
- c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
- if (buffer_len(&c->output) > 0) {
- FD_SET(c->sock, writeset);
- } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
- chan_obuf_empty(c);
- }
- }
-}
+ u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
-void
-channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
-{
if (c->istate == CHAN_INPUT_OPEN &&
- c->remote_window > 0 &&
- buffer_len(&c->input) < c->remote_window)
+ limit > 0 &&
+ buffer_len(&c->input) < limit)
FD_SET(c->rfd, readset);
if (c->ostate == CHAN_OUTPUT_OPEN ||
c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
}
}
/** XXX check close conditions, too */
- if (c->efd != -1) {
+ if (compat20 && c->efd != -1) {
if (c->extended_usage == CHAN_EXTENDED_WRITE &&
buffer_len(&c->extended) > 0)
FD_SET(c->efd, writeset);
}
}
-void
+static void
channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->input) == 0) {
}
}
-void
+static void
channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->output) == 0)
* XXX All this happens at the client side.
* Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
*/
-int
+static int
x11_open_helper(Buffer *b)
{
u_char *ucp;
return 0;
/* Parse the lengths of variable-length fields. */
- ucp = (u_char *) buffer_ptr(b);
+ ucp = buffer_ptr(b);
if (ucp[0] == 0x42) { /* Byte order MSB first. */
proto_len = 256 * ucp[6] + ucp[7];
data_len = 256 * ucp[8] + ucp[9];
data_len = ucp[8] + 256 * ucp[9];
} else {
debug("Initial X11 packet contains bad byte order byte: 0x%x",
- ucp[0]);
+ ucp[0]);
return -1;
}
return 1;
}
-void
+static void
channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
{
int ret = x11_open_helper(&c->output);
log("X11 connection rejected because of wrong authentication.");
buffer_clear(&c->input);
buffer_clear(&c->output);
- close(c->sock);
+ channel_close_fd(&c->sock);
c->sock = -1;
c->type = SSH_CHANNEL_CLOSED;
packet_start(SSH_MSG_CHANNEL_CLOSE);
}
}
-void
+static void
channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
{
int ret = x11_open_helper(&c->output);
+
+ /* c->force_drain = 1; */
+
if (ret == 1) {
c->type = SSH_CHANNEL_OPEN;
- if (compat20)
- channel_pre_open_20(c, readset, writeset);
- else
- channel_pre_open_15(c, readset, writeset);
+ channel_pre_open(c, readset, writeset);
} else if (ret == -1) {
+ log("X11 connection rejected because of wrong authentication.");
debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
- chan_read_failed(c); /** force close? */
- chan_write_failed(c);
+ chan_read_failed(c);
+ buffer_clear(&c->input);
+ chan_ibuf_empty(c);
+ buffer_clear(&c->output);
+ /* for proto v1, the peer will send an IEOF */
+ if (compat20)
+ chan_write_failed(c);
+ else
+ c->type = SSH_CHANNEL_OPEN;
debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
}
}
/* try to decode a socks4 header */
-int
+static int
channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
{
u_char *p, *host;
int len, have, i, found;
- char username[256];
+ char username[256];
struct {
u_int8_t version;
u_int8_t command;
host = inet_ntoa(s4_req.dest_addr);
strlcpy(c->path, host, sizeof(c->path));
c->host_port = ntohs(s4_req.dest_port);
-
+
debug("channel %d: dynamic request: socks4 host %s port %u command %u",
c->self, host, c->host_port, s4_req.command);
}
/* dynamic port forwarding */
-void
+static void
channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
{
u_char *p;
int have, ret;
have = buffer_len(&c->input);
-
+ c->delayed = 0;
debug2("channel %d: pre_dynamic: have %d", c->self, have);
/* buffer_dump(&c->input); */
/* check if the fixed size part of the packet is in buffer. */
}
/* This is our fake X11 server socket. */
-void
+static void
channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
{
Channel *nc;
struct sockaddr addr;
- int newsock;
+ int newsock, on = 1;
socklen_t addrlen;
char buf[16384], *remote_ipaddr;
int remote_port;
debug("X11 connection requested.");
addrlen = sizeof(addr);
newsock = accept(c->sock, &addr, &addrlen);
+ if (c->single_connection) {
+ debug("single_connection: closing X11 listener.");
+ channel_close_fd(&c->sock);
+ chan_mark_dead(c);
+ }
if (newsock < 0) {
error("accept: %.100s", strerror(errno));
return;
}
+ if (setsockopt(newsock, IPPROTO_TCP, TCP_NODELAY, &on,
+ sizeof on) == -1)
+ error("setsockopt TCP_NODELAY: %.100s",
+ strerror(errno));
remote_ipaddr = get_peer_ipaddr(newsock);
remote_port = get_peer_port(newsock);
snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
packet_start(SSH2_MSG_CHANNEL_OPEN);
packet_put_cstring("x11");
packet_put_int(nc->self);
- packet_put_int(c->local_window_max);
- packet_put_int(c->local_maxpacket);
+ packet_put_int(nc->local_window_max);
+ packet_put_int(nc->local_maxpacket);
/* originator ipaddr and port */
packet_put_cstring(remote_ipaddr);
if (datafellows & SSH_BUG_X11FWD) {
packet_put_int(nc->self);
if (packet_get_protocol_flags() &
SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
- packet_put_string(buf, strlen(buf));
+ packet_put_cstring(buf);
packet_send();
}
xfree(remote_ipaddr);
}
}
-void
+static void
port_open_helper(Channel *c, char *rtype)
{
int direct;
/*
* This socket is listening for connections to a forwarded TCP/IP port.
*/
-void
+static void
channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
{
Channel *nc;
"to %.100s port %d requested.",
c->listening_port, c->path, c->host_port);
- rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
- "forwarded-tcpip" : "direct-tcpip";
- nextstate = (c->host_port == 0 &&
- c->type != SSH_CHANNEL_RPORT_LISTENER) ?
- SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING;
+ if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
+ nextstate = SSH_CHANNEL_OPENING;
+ rtype = "forwarded-tcpip";
+ } else {
+ if (c->host_port == 0) {
+ nextstate = SSH_CHANNEL_DYNAMIC;
+ rtype = "dynamic-tcpip";
+ } else {
+ nextstate = SSH_CHANNEL_OPENING;
+ rtype = "direct-tcpip";
+ }
+ }
addrlen = sizeof(addr);
newsock = accept(c->sock, &addr, &addrlen);
nc->host_port = c->host_port;
strlcpy(nc->path, c->path, sizeof(nc->path));
- if (nextstate != SSH_CHANNEL_DYNAMIC)
+ if (nextstate == SSH_CHANNEL_DYNAMIC) {
+ /*
+ * do not call the channel_post handler until
+ * this flag has been reset by a pre-handler.
+ * otherwise the FD_ISSET calls might overflow
+ */
+ nc->delayed = 1;
+ } else {
port_open_helper(nc, rtype);
+ }
}
}
* This is the authentication agent socket listening for connections from
* clients.
*/
-void
+static void
channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
{
Channel *nc;
}
}
-void
+static void
channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
{
int err = 0;
- int sz = sizeof(err);
+ socklen_t sz = sizeof(err);
if (FD_ISSET(c->sock, writeset)) {
if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
}
}
-int
+static int
channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
{
char buf[16*1024];
chan_mark_dead(c);
return -1;
} else if (compat13) {
- buffer_consume(&c->output, buffer_len(&c->output));
+ buffer_clear(&c->output);
c->type = SSH_CHANNEL_INPUT_DRAINING;
debug("channel %d: input draining.", c->self);
} else {
}
return -1;
}
- if(c->input_filter != NULL) {
+ if (c->input_filter != NULL) {
if (c->input_filter(c, buf, len) == -1) {
debug("channel %d: filter stops", c->self);
chan_read_failed(c);
}
return 1;
}
-int
+static int
channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
{
struct termios tio;
+ u_char *data;
+ u_int dlen;
int len;
/* Send buffered output data to the socket. */
if (c->wfd != -1 &&
FD_ISSET(c->wfd, writeset) &&
buffer_len(&c->output) > 0) {
- len = write(c->wfd, buffer_ptr(&c->output),
- buffer_len(&c->output));
+ data = buffer_ptr(&c->output);
+ dlen = buffer_len(&c->output);
+ len = write(c->wfd, data, dlen);
if (len < 0 && (errno == EINTR || errno == EAGAIN))
return 1;
if (len <= 0) {
chan_mark_dead(c);
return -1;
} else if (compat13) {
- buffer_consume(&c->output, buffer_len(&c->output));
+ buffer_clear(&c->output);
debug("channel %d: input draining.", c->self);
c->type = SSH_CHANNEL_INPUT_DRAINING;
} else {
}
return -1;
}
- if (compat20 && c->isatty) {
+ if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
if (tcgetattr(c->wfd, &tio) == 0 &&
!(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
/*
}
return 1;
}
-int
+static int
channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
{
char buf[16*1024];
if (len <= 0) {
debug2("channel %d: closing write-efd %d",
c->self, c->efd);
- close(c->efd);
- c->efd = -1;
+ channel_close_fd(&c->efd);
} else {
buffer_consume(&c->extended, len);
c->local_consumed += len;
FD_ISSET(c->efd, readset)) {
len = read(c->efd, buf, sizeof(buf));
debug2("channel %d: read %d from efd %d",
- c->self, len, c->efd);
+ c->self, len, c->efd);
if (len < 0 && (errno == EINTR || errno == EAGAIN))
return 1;
if (len <= 0) {
debug2("channel %d: closing read-efd %d",
c->self, c->efd);
- close(c->efd);
- c->efd = -1;
+ channel_close_fd(&c->efd);
} else {
buffer_append(&c->extended, buf, len);
}
}
return 1;
}
-int
+static int
channel_check_window(Channel *c)
{
if (c->type == SSH_CHANNEL_OPEN &&
return 1;
}
-void
-channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
-{
- channel_handle_rfd(c, readset, writeset);
- channel_handle_wfd(c, readset, writeset);
-}
-
-void
-channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
+static void
+channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
{
+ if (c->delayed)
+ return;
channel_handle_rfd(c, readset, writeset);
channel_handle_wfd(c, readset, writeset);
+ if (!compat20)
+ return;
channel_handle_efd(c, readset, writeset);
-
channel_check_window(c);
}
-void
+static void
channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
{
int len;
len = write(c->sock, buffer_ptr(&c->output),
buffer_len(&c->output));
if (len <= 0)
- buffer_consume(&c->output, buffer_len(&c->output));
+ buffer_clear(&c->output);
else
buffer_consume(&c->output, len);
}
}
-void
+static void
channel_handler_init_20(void)
{
- channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
+ channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
- channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
+ channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
- channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
+ channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
}
-void
+static void
channel_handler_init_13(void)
{
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
- channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
+ channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
- channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
+ channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
}
-void
+static void
channel_handler_init_15(void)
{
- channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
+ channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
- channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
+ channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
- channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
+ channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
}
-void
+static void
channel_handler_init(void)
{
int i;
- for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
+ for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
channel_pre[i] = NULL;
channel_post[i] = NULL;
}
channel_handler_init_15();
}
-void
+/* gc dead channels */
+static void
+channel_garbage_collect(Channel *c)
+{
+ if (c == NULL)
+ return;
+ if (c->detach_user != NULL) {
+ if (!chan_is_dead(c, 0))
+ return;
+ debug("channel %d: gc: notify user", c->self);
+ c->detach_user(c->self, NULL);
+ /* if we still have a callback */
+ if (c->detach_user != NULL)
+ return;
+ debug("channel %d: gc: user detached", c->self);
+ }
+ if (!chan_is_dead(c, 1))
+ return;
+ debug("channel %d: garbage collecting", c->self);
+ channel_free(c);
+}
+
+static void
channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
{
static int did_init = 0;
continue;
if (ftab[c->type] != NULL)
(*ftab[c->type])(c, readset, writeset);
- if (chan_is_dead(c)) {
- /*
- * we have to remove the fd's from the select mask
- * before the channels are free'd and the fd's are
- * closed
- */
- if (c->wfd != -1)
- FD_CLR(c->wfd, writeset);
- if (c->rfd != -1)
- FD_CLR(c->rfd, readset);
- if (c->efd != -1) {
- if (c->extended_usage == CHAN_EXTENDED_READ)
- FD_CLR(c->efd, readset);
- if (c->extended_usage == CHAN_EXTENDED_WRITE)
- FD_CLR(c->efd, writeset);
- }
- channel_free(c);
- }
+ channel_garbage_collect(c);
}
}
*/
void
channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
- int rekeying)
+ int *nallocp, int rekeying)
{
int n;
u_int sz;
n = MAX(*maxfdp, channel_max_fd);
sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
- if (*readsetp == NULL || n > *maxfdp) {
- if (*readsetp)
- xfree(*readsetp);
- if (*writesetp)
- xfree(*writesetp);
- *readsetp = xmalloc(sz);
- *writesetp = xmalloc(sz);
- *maxfdp = n;
+ /* perhaps check sz < nalloc/2 and shrink? */
+ if (*readsetp == NULL || sz > *nallocp) {
+ *readsetp = xrealloc(*readsetp, sz);
+ *writesetp = xrealloc(*writesetp, sz);
+ *nallocp = sz;
}
+ *maxfdp = n;
memset(*readsetp, 0, sz);
memset(*writesetp, 0, sz);
/* If there is data to send to the connection, enqueue some of it now. */
void
-channel_output_poll()
+channel_output_poll(void)
{
int len, i;
Channel *c;
if (compat20 &&
(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
/* XXX is this true? */
- debug2("channel %d: no data after CLOSE", c->self);
+ debug3("channel %d: will not send data after close", c->self);
continue;
}
/* -- protocol input */
void
-channel_input_data(int type, int plen, void *ctxt)
+channel_input_data(int type, u_int32_t seq, void *ctxt)
{
int id;
char *data;
/* Get the data. */
data = packet_get_string(&data_len);
- packet_done();
- if (compat20){
+ if (compat20) {
if (data_len > c->local_maxpacket) {
log("channel %d: rcvd big packet %d, maxpack %d",
c->self, data_len, c->local_maxpacket);
return;
}
c->local_window -= data_len;
- }else{
- packet_integrity_check(plen, 4 + 4 + data_len, type);
}
+ packet_check_eom();
buffer_append(&c->output, data, data_len);
xfree(data);
}
void
-channel_input_extended_data(int type, int plen, void *ctxt)
+channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
{
int id;
int tcode;
return;
}
data = packet_get_string(&data_len);
- packet_done();
+ packet_check_eom();
if (data_len > c->local_window) {
log("channel %d: rcvd too much extended_data %d, win %d",
c->self, data_len, c->local_window);
}
void
-channel_input_ieof(int type, int plen, void *ctxt)
+channel_input_ieof(int type, u_int32_t seq, void *ctxt)
{
int id;
Channel *c;
- packet_integrity_check(plen, 4, type);
-
id = packet_get_int();
+ packet_check_eom();
c = channel_lookup(id);
if (c == NULL)
packet_disconnect("Received ieof for nonexistent channel %d.", id);
chan_rcvd_ieof(c);
+
+ /* XXX force input close */
+ if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
+ debug("channel %d: FORCE input drain", c->self);
+ c->istate = CHAN_INPUT_WAIT_DRAIN;
+ }
+
}
void
-channel_input_close(int type, int plen, void *ctxt)
+channel_input_close(int type, u_int32_t seq, void *ctxt)
{
int id;
Channel *c;
- packet_integrity_check(plen, 4, type);
-
id = packet_get_int();
+ packet_check_eom();
c = channel_lookup(id);
if (c == NULL)
packet_disconnect("Received close for nonexistent channel %d.", id);
* Not a closed channel - mark it as draining, which will
* cause it to be freed later.
*/
- buffer_consume(&c->input, buffer_len(&c->input));
+ buffer_clear(&c->input);
c->type = SSH_CHANNEL_OUTPUT_DRAINING;
}
}
/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
void
-channel_input_oclose(int type, int plen, void *ctxt)
+channel_input_oclose(int type, u_int32_t seq, void *ctxt)
{
int id = packet_get_int();
Channel *c = channel_lookup(id);
- packet_integrity_check(plen, 4, type);
+
+ packet_check_eom();
if (c == NULL)
packet_disconnect("Received oclose for nonexistent channel %d.", id);
chan_rcvd_oclose(c);
}
void
-channel_input_close_confirmation(int type, int plen, void *ctxt)
+channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
{
int id = packet_get_int();
Channel *c = channel_lookup(id);
- packet_done();
+ packet_check_eom();
if (c == NULL)
packet_disconnect("Received close confirmation for "
"out-of-range channel %d.", id);
}
void
-channel_input_open_confirmation(int type, int plen, void *ctxt)
+channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
{
int id, remote_id;
Channel *c;
- if (!compat20)
- packet_integrity_check(plen, 4 + 4, type);
-
id = packet_get_int();
c = channel_lookup(id);
if (compat20) {
c->remote_window = packet_get_int();
c->remote_maxpacket = packet_get_int();
- packet_done();
if (c->cb_fn != NULL && c->cb_event == type) {
debug2("callback start");
c->cb_fn(c->self, c->cb_arg);
debug("channel %d: open confirm rwindow %d rmax %d", c->self,
c->remote_window, c->remote_maxpacket);
}
+ packet_check_eom();
}
-char *
+static char *
reason2txt(int reason)
{
- switch(reason) {
+ switch (reason) {
case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
return "administratively prohibited";
case SSH2_OPEN_CONNECT_FAILED:
}
void
-channel_input_open_failure(int type, int plen, void *ctxt)
+channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
{
int id, reason;
char *msg = NULL, *lang = NULL;
Channel *c;
- if (!compat20)
- packet_integrity_check(plen, 4, type);
-
id = packet_get_int();
c = channel_lookup(id);
msg = packet_get_string(NULL);
lang = packet_get_string(NULL);
}
- packet_done();
log("channel %d: open failed: %s%s%s", id,
reason2txt(reason), msg ? ": ": "", msg ? msg : "");
if (msg != NULL)
if (lang != NULL)
xfree(lang);
}
+ packet_check_eom();
/* Free the channel. This will also close the socket. */
channel_free(c);
}
void
-channel_input_channel_request(int type, int plen, void *ctxt)
+channel_input_channel_request(int type, u_int32_t seq, void *ctxt)
{
int id;
Channel *c;
}
void
-channel_input_window_adjust(int type, int plen, void *ctxt)
+channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
{
Channel *c;
int id, adjust;
return;
}
adjust = packet_get_int();
- packet_done();
+ packet_check_eom();
debug2("channel %d: rcvd adjust %d", id, adjust);
c->remote_window += adjust;
}
void
-channel_input_port_open(int type, int plen, void *ctxt)
+channel_input_port_open(int type, u_int32_t seq, void *ctxt)
{
Channel *c = NULL;
u_short host_port;
} else {
originator_string = xstrdup("unknown (remote did not supply name)");
}
- packet_done();
+ packet_check_eom();
sock = channel_connect_to(host, host_port);
if (sock != -1) {
c = channel_new("connected socket",
/* -- tcp forwarding */
+void
+channel_set_af(int af)
+{
+ IPv4or6 = af;
+}
+
/*
* Initiate forwarding of connections to local port "port" through the secure
* channel to host:port from remote side.
channel_request_remote_forwarding(u_short listen_port,
const char *host_to_connect, u_short port_to_connect)
{
- int payload_len, type, success = 0;
+ int type, success = 0;
/* Record locally that connection to this host/port is permitted. */
if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
packet_write_wait();
/* Wait for response from the remote side. */
- type = packet_read(&payload_len);
+ type = packet_read();
switch (type) {
case SSH_SMSG_SUCCESS:
success = 1;
* anyway, and the server has no way to know but to trust the client anyway.
*/
void
-channel_permit_all_opens()
+channel_permit_all_opens(void)
{
if (num_permitted_opens == 0)
all_opens_permitted = 1;
/* return socket to remote host, port */
-int
+static int
connect_to(const char *host, u_short port)
{
struct addrinfo hints, *ai, *aitop;
}
int
-channel_connect_by_listen_adress(u_short listen_port)
+channel_connect_by_listen_address(u_short listen_port)
{
int i;
/*
* Creates an internet domain socket for listening for X11 connections.
- * Returns a suitable value for the DISPLAY variable, or NULL if an error
- * occurs.
+ * Returns a suitable display number for the DISPLAY variable, or -1 if
+ * an error occurs.
*/
-char *
-x11_create_display_inet(int screen_number, int x11_display_offset)
+int
+x11_create_display_inet(int x11_display_offset, int gateway_ports,
+ int single_connection)
{
+ Channel *nc = NULL;
int display_number, sock;
u_short port;
struct addrinfo hints, *ai, *aitop;
char strport[NI_MAXSERV];
int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
- char display[512];
- char hostname[MAXHOSTNAMELEN];
for (display_number = x11_display_offset;
- display_number < MAX_DISPLAYS;
- display_number++) {
+ display_number < MAX_DISPLAYS;
+ display_number++) {
port = 6000 + display_number;
memset(&hints, 0, sizeof(hints));
hints.ai_family = IPv4or6;
- hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
+ hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
hints.ai_socktype = SOCK_STREAM;
snprintf(strport, sizeof strport, "%d", port);
if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
error("getaddrinfo: %.100s", gai_strerror(gaierr));
- return NULL;
+ return -1;
}
for (ai = aitop; ai; ai = ai->ai_next) {
if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
if (sock < 0) {
if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
error("socket: %.100s", strerror(errno));
- return NULL;
+ return -1;
} else {
debug("x11_create_display_inet: Socket family %d not supported",
ai->ai_family);
}
if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
debug("bind port %d: %.100s", port, strerror(errno));
- shutdown(sock, SHUT_RDWR);
close(sock);
if (ai->ai_next)
continue;
for (n = 0; n < num_socks; n++) {
- shutdown(socks[n], SHUT_RDWR);
close(socks[n]);
}
num_socks = 0;
}
if (display_number >= MAX_DISPLAYS) {
error("Failed to allocate internet-domain X11 display socket.");
- return NULL;
+ return -1;
}
/* Start listening for connections on the socket. */
for (n = 0; n < num_socks; n++) {
sock = socks[n];
if (listen(sock, 5) < 0) {
error("listen: %.100s", strerror(errno));
- shutdown(sock, SHUT_RDWR);
close(sock);
- return NULL;
- }
- }
-
- /* Set up a suitable value for the DISPLAY variable. */
- if (gethostname(hostname, sizeof(hostname)) < 0)
- fatal("gethostname: %.100s", strerror(errno));
-
-#ifdef IPADDR_IN_DISPLAY
- /*
- * HPUX detects the local hostname in the DISPLAY variable and tries
- * to set up a shared memory connection to the server, which it
- * incorrectly supposes to be local.
- *
- * The workaround - as used in later $$H and other programs - is
- * is to set display to the host's IP address.
- */
- {
- struct hostent *he;
- struct in_addr my_addr;
-
- he = gethostbyname(hostname);
- if (he == NULL) {
- error("[X11-broken-fwd-hostname-workaround] Could not get "
- "IP address for hostname %s.", hostname);
-
- packet_send_debug("[X11-broken-fwd-hostname-workaround]"
- "Could not get IP address for hostname %s.", hostname);
-
- shutdown(sock, SHUT_RDWR);
- close(sock);
-
- return NULL;
+ return -1;
}
-
- memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
-
- /* Set DISPLAY to <ip address>:screen.display */
- snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr),
- display_number, screen_number);
}
-#else /* IPADDR_IN_DISPLAY */
- /* Just set DISPLAY to hostname:screen.display */
- snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
- display_number, screen_number);
-#endif /* IPADDR_IN_DISPLAY */
/* Allocate a channel for each socket. */
for (n = 0; n < num_socks; n++) {
sock = socks[n];
- (void) channel_new("x11 listener",
+ nc = channel_new("x11 listener",
SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
0, xstrdup("X11 inet listener"), 1);
+ if (nc != NULL)
+ nc->single_connection = single_connection;
}
- /* Return a suitable value for the DISPLAY environment variable. */
- return xstrdup(display);
+ /* Return the display number for the DISPLAY environment variable. */
+ return display_number;
}
-#ifndef X_UNIX_PATH
-#define X_UNIX_PATH "/tmp/.X11-unix/X"
-#endif
-
-static
-int
+static int
connect_local_xsocket(u_int dnr)
{
- static const char *const x_sockets[] = {
- X_UNIX_PATH "%u",
- "/var/X/.X11-unix/X" "%u",
- "/usr/spool/sockets/X11/" "%u",
- NULL
- };
int sock;
struct sockaddr_un addr;
- const char *const * path;
- for (path = x_sockets; *path; ++path) {
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0)
- error("socket: %.100s", strerror(errno));
- memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
- if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
- return sock;
- close(sock);
- }
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock < 0)
+ error("socket: %.100s", strerror(errno));
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
+ if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
+ return sock;
+ close(sock);
error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
return -1;
}
int
x11_connect_display(void)
{
- int display_number, sock = 0;
+ int display_number, sock = 0, on = 1;
const char *display;
char buf[1024], *cp;
struct addrinfo hints, *ai, *aitop;
/* Connect to the unix domain socket. */
if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
error("Could not parse display number from DISPLAY: %.100s",
- display);
+ display);
return -1;
}
/* Create a socket. */
* Connect to an inet socket. The DISPLAY value is supposedly
* hostname:d[.s], where hostname may also be numeric IP address.
*/
- strncpy(buf, display, sizeof(buf));
- buf[sizeof(buf) - 1] = 0;
+ strlcpy(buf, display, sizeof(buf));
cp = strchr(buf, ':');
if (!cp) {
error("Could not find ':' in DISPLAY: %.100s", display);
/* buf now contains the host name. But first we parse the display number. */
if (sscanf(cp + 1, "%d", &display_number) != 1) {
error("Could not parse display number from DISPLAY: %.100s",
- display);
+ display);
return -1;
}
strerror(errno));
return -1;
}
+ if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) == -1)
+ error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
return sock;
}
*/
void
-x11_input_open(int type, int plen, void *ctxt)
+x11_input_open(int type, u_int32_t seq, void *ctxt)
{
Channel *c = NULL;
int remote_id, sock = 0;
} else {
remote_host = xstrdup("unknown (remote did not supply name)");
}
- packet_done();
+ packet_check_eom();
/* Obtain a connection to the real X display. */
sock = x11_connect_display();
close(sock);
} else {
c->remote_id = remote_id;
+ c->force_drain = 1;
}
}
if (c == NULL) {
/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
void
-deny_input_open(int type, int plen, void *ctxt)
+deny_input_open(int type, u_int32_t seq, void *ctxt)
{
int rchan = packet_get_int();
- switch(type){
+ switch (type) {
case SSH_SMSG_AGENT_OPEN:
error("Warning: ssh server tried agent forwarding.");
break;
error("Warning: ssh server tried X11 forwarding.");
break;
default:
- error("deny_input_open: type %d plen %d", type, plen);
+ error("deny_input_open: type %d", type);
break;
}
error("Warning: this is probably a break in attempt by a malicious server.");
/* Sends a message to the server to request authentication fd forwarding. */
void
-auth_request_forwarding()
+auth_request_forwarding(void)
{
packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
packet_send();
*/
char *
-auth_get_socket_name()
+auth_get_socket_name(void)
{
return auth_sock_name;
}
/* removes the agent forwarding socket */
void
-auth_sock_cleanup_proc(void *ignored)
+auth_sock_cleanup_proc(void *_pw)
{
+ struct passwd *pw = _pw;
+
if (auth_sock_name) {
+ temporarily_use_uid(pw);
unlink(auth_sock_name);
rmdir(auth_sock_dir);
auth_sock_name = NULL;
+ restore_uid();
}
}
auth_sock_dir, (int) getpid());
/* delete agent socket on fatal() */
- fatal_add_cleanup(auth_sock_cleanup_proc, NULL);
+ fatal_add_cleanup(auth_sock_cleanup_proc, pw);
/* Create the socket. */
sock = socket(AF_UNIX, SOCK_STREAM, 0);
/* Bind it to the name. */
memset(&sunaddr, 0, sizeof(sunaddr));
sunaddr.sun_family = AF_UNIX;
- strncpy(sunaddr.sun_path, auth_sock_name,
- sizeof(sunaddr.sun_path));
+ strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
packet_disconnect("bind: %.100s", strerror(errno));
0, xstrdup("auth socket"), 1);
if (nc == NULL) {
error("auth_input_request_forwarding: channel_new failed");
- auth_sock_cleanup_proc(NULL);
+ auth_sock_cleanup_proc(pw);
+ fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
close(sock);
return 0;
}
/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
void
-auth_input_open_request(int type, int plen, void *ctxt)
+auth_input_open_request(int type, u_int32_t seq, void *ctxt)
{
Channel *c = NULL;
int remote_id, sock;
char *name;
- packet_integrity_check(plen, 4, type);
-
/* Read the remote channel number from the message. */
remote_id = packet_get_int();
+ packet_check_eom();
/*
* Get a connection to the local authentication agent (this may again
close(sock);
} else {
c->remote_id = remote_id;
+ c->force_drain = 1;
}
}
if (c == NULL) {
andersk / openssh.git / blobdiff