* 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 1.110 2001/04/29 19:16:52 markus Exp $");
-
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
+RCSID("$OpenBSD: channels.c,v 1.201 2004/05/11 19:01:43 deraadt Exp $");
#include "ssh.h"
#include "ssh1.h"
#include "ssh2.h"
#include "packet.h"
#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
-#include "uidswap.h"
#include "log.h"
#include "misc.h"
#include "channels.h"
-#include "nchan.h"
#include "compat.h"
#include "canohost.h"
#include "key.h"
#include "authfd.h"
+#include "pathnames.h"
+#include "bufaux.h"
-/* Maximum number of fake X11 displays to try. */
-#define MAX_DISPLAYS 1000
-
-/* Max len of agent socket */
-#define MAX_SOCKET_NAME 100
+/* -- channel core */
/*
* Pointer to an array containing all allocated channels. The array is
* dynamically extended as needed.
*/
-static Channel *channels = NULL;
+static Channel **channels = NULL;
/*
* Size of the channel array. All slots of the array must always be
- * initialized (at least the type field); unused slots are marked with type
- * SSH_CHANNEL_FREE.
+ * initialized (at least the type field); unused slots set to NULL
*/
static int channels_alloc = 0;
/*
* Maximum file descriptor value used in any of the channels. This is
- * updated in channel_allocate.
+ * updated in channel_new.
*/
static int channel_max_fd = 0;
-/* Name and directory of socket for authentication agent forwarding. */
-static char *channel_forwarded_auth_socket_name = NULL;
-static char *channel_forwarded_auth_socket_dir = NULL;
-/* Saved X11 authentication protocol name. */
-char *x11_saved_proto = NULL;
-
-/* Saved X11 authentication data. This is the real data. */
-char *x11_saved_data = NULL;
-u_int x11_saved_data_len = 0;
-
-/*
- * Fake X11 authentication data. This is what the server will be sending us;
- * we should replace any occurrences of this by the real data.
- */
-char *x11_fake_data = NULL;
-u_int x11_fake_data_len;
+/* -- tcp forwarding */
/*
* Data structure for storing which hosts are permitted for forward requests.
/* List of all permitted host/port pairs to connect. */
static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
+
/* Number of permitted host/port pairs in the array. */
static int num_permitted_opens = 0;
/*
*/
static int all_opens_permitted = 0;
-/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
-static int have_hostname_in_open = 0;
-/* AF_UNSPEC or AF_INET or AF_INET6 */
-extern int IPv4or6;
+/* -- X11 forwarding */
-void port_open_helper(Channel *c, char *rtype);
+/* Maximum number of fake X11 displays to try. */
+#define MAX_DISPLAYS 1000
-/* Sets specific protocol options. */
+/* Saved X11 authentication protocol name. */
+static char *x11_saved_proto = NULL;
-void
-channel_set_options(int hostname_in_open)
-{
- have_hostname_in_open = hostname_in_open;
-}
+/* Saved X11 authentication data. This is the real data. */
+static char *x11_saved_data = NULL;
+static u_int x11_saved_data_len = 0;
+
+/*
+ * Fake X11 authentication data. This is what the server will be sending us;
+ * we should replace any occurrences of this by the real data.
+ */
+static char *x11_fake_data = NULL;
+static u_int x11_fake_data_len;
+
+
+/* -- agent forwarding */
+
+#define NUM_SOCKS 10
+
+/* AF_UNSPEC or AF_INET or AF_INET6 */
+static int IPv4or6 = AF_UNSPEC;
-/* lookup channel by id */
+/* helper */
+static void port_open_helper(Channel *c, char *rtype);
+
+/* -- channel core */
Channel *
channel_lookup(int id)
{
Channel *c;
- if (id < 0 || id > channels_alloc) {
- log("channel_lookup: %d: bad id", id);
+
+ if (id < 0 || id >= channels_alloc) {
+ logit("channel_lookup: %d: bad id", id);
return NULL;
}
- c = &channels[id];
- if (c->type == SSH_CHANNEL_FREE) {
- log("channel_lookup: %d: bad id: channel free", id);
+ c = channels[id];
+ if (c == NULL) {
+ logit("channel_lookup: %d: bad id: channel free", id);
return NULL;
}
return c;
* 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)
{
/* XXX ugly hack: nonblock is only set by the server */
if (nonblock && isatty(c->rfd)) {
- debug("channel %d: rfd %d isatty", c->self, c->rfd);
+ debug2("channel %d: rfd %d isatty", c->self, c->rfd);
c->isatty = 1;
if (!isatty(c->wfd)) {
error("channel %d: wfd %d is not a tty?",
} else {
c->isatty = 0;
}
+ c->wfd_isatty = isatty(c->wfd);
/* enable nonblocking mode */
if (nonblock) {
* remote_name to be freed.
*/
-int
+Channel *
channel_new(char *ctype, int type, int rfd, int wfd, int efd,
- int window, int maxpack, int extusage, char *remote_name, int nonblock)
+ u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
{
int i, found;
Channel *c;
/* Do initial allocation if this is the first call. */
if (channels_alloc == 0) {
- chan_init();
channels_alloc = 10;
- channels = xmalloc(channels_alloc * sizeof(Channel));
+ channels = xmalloc(channels_alloc * sizeof(Channel *));
for (i = 0; i < channels_alloc; i++)
- channels[i].type = SSH_CHANNEL_FREE;
- /*
- * Kludge: arrange a call to channel_stop_listening if we
- * terminate with fatal().
- */
- fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
+ channels[i] = NULL;
}
/* Try to find a free slot where to put the new channel. */
for (found = -1, i = 0; i < channels_alloc; i++)
- if (channels[i].type == SSH_CHANNEL_FREE) {
+ if (channels[i] == NULL) {
/* Found a free slot. */
found = i;
break;
if (found == -1) {
/* There are no free slots. Take last+1 slot and expand the array. */
found = channels_alloc;
+ if (channels_alloc > 10000)
+ fatal("channel_new: internal error: channels_alloc %d "
+ "too big.", channels_alloc);
+ channels = xrealloc(channels,
+ (channels_alloc + 10) * sizeof(Channel *));
channels_alloc += 10;
debug2("channel: expanding %d", channels_alloc);
- channels = xrealloc(channels, channels_alloc * sizeof(Channel));
for (i = found; i < channels_alloc; i++)
- channels[i].type = SSH_CHANNEL_FREE;
+ channels[i] = NULL;
}
- /* Initialize and return new channel number. */
- c = &channels[found];
+ /* 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->local_consumed = 0;
c->local_maxpacket = maxpack;
c->remote_id = -1;
- c->remote_name = remote_name;
+ c->remote_name = xstrdup(remote_name);
c->remote_window = 0;
c->remote_maxpacket = 0;
- 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->confirm = NULL;
c->input_filter = NULL;
debug("channel %d: new [%s]", found, remote_name);
- return found;
+ return c;
}
-/* old interface XXX */
-int
-channel_allocate(int type, int sock, char *remote_name)
+
+static int
+channel_find_maxfd(void)
{
- return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1);
+ 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)
{
- 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;
- }
+ debug3("channel %d: close_fds r %d w %d e %d",
+ c->self, c->rfd, c->wfd, c->efd);
+
+ 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. */
void
-channel_free(int id)
+channel_free(Channel *c)
{
- Channel *c = channel_lookup(id);
- char *s = channel_open_message();
+ char *s;
+ int i, n;
- if (c == NULL)
- packet_disconnect("channel free: bad local channel %d", id);
- debug("channel_free: channel %d: status: %s", id, s);
+ for (n = 0, i = 0; i < channels_alloc; i++)
+ if (channels[i])
+ n++;
+ debug("channel %d: free: %s, nchannels %d", c->self,
+ c->remote_name ? c->remote_name : "???", n);
+
+ s = channel_open_message();
+ debug3("channel %d: status: %s", c->self, s);
xfree(s);
- if (c->dettach_user != NULL) {
- debug("channel_free: channel %d: dettaching channel user", id);
- c->dettach_user(c->self, NULL);
- }
if (c->sock != -1)
shutdown(c->sock, SHUT_RDWR);
channel_close_fds(c);
buffer_free(&c->input);
buffer_free(&c->output);
buffer_free(&c->extended);
- c->type = SSH_CHANNEL_FREE;
if (c->remote_name) {
xfree(c->remote_name);
c->remote_name = NULL;
}
+ channels[c->self] = NULL;
+ 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]);
+}
+
+/*
+ * Stop listening to channels.
+ */
+
+void
+channel_stop_listening(void)
+{
+ int i;
+ Channel *c;
+
+ for (i = 0; i < channels_alloc; i++) {
+ c = channels[i];
+ if (c != NULL) {
+ switch (c->type) {
+ case SSH_CHANNEL_AUTH_SOCKET:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_RPORT_LISTENER:
+ case SSH_CHANNEL_X11_LISTENER:
+ channel_close_fd(&c->sock);
+ channel_free(c);
+ break;
+ }
+ }
+ }
+}
+
+/*
+ * 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(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 0
+ if (!compat20 &&
+ buffer_len(&c->input) > packet_get_maxsize()) {
+ debug2("channel %d: big input buffer %d",
+ c->self, buffer_len(&c->input));
+ return 0;
+ }
+#endif
+ if (buffer_len(&c->output) > packet_get_maxsize()) {
+ debug2("channel %d: big output buffer %u > %u",
+ c->self, buffer_len(&c->output),
+ packet_get_maxsize());
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+/* Returns true if any channel is still open. */
+
+int
+channel_still_open(void)
+{
+ int i;
+ Channel *c;
+
+ for (i = 0; i < channels_alloc; i++) {
+ c = channels[i];
+ if (c == NULL)
+ continue;
+ switch (c->type) {
+ case SSH_CHANNEL_X11_LISTENER:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_RPORT_LISTENER:
+ case SSH_CHANNEL_CLOSED:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ case SSH_CHANNEL_DYNAMIC:
+ case SSH_CHANNEL_CONNECTING:
+ case SSH_CHANNEL_ZOMBIE:
+ continue;
+ case SSH_CHANNEL_LARVAL:
+ if (!compat20)
+ fatal("cannot happen: SSH_CHANNEL_LARVAL");
+ continue;
+ case SSH_CHANNEL_OPENING:
+ case SSH_CHANNEL_OPEN:
+ case SSH_CHANNEL_X11_OPEN:
+ return 1;
+ case SSH_CHANNEL_INPUT_DRAINING:
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ if (!compat13)
+ fatal("cannot happen: OUT_DRAIN");
+ return 1;
+ default:
+ fatal("channel_still_open: bad channel type %d", c->type);
+ /* NOTREACHED */
+ }
+ }
+ return 0;
+}
+
+/* Returns the id of an open channel suitable for keepaliving */
+
+int
+channel_find_open(void)
+{
+ int i;
+ Channel *c;
+
+ for (i = 0; i < channels_alloc; i++) {
+ c = channels[i];
+ if (c == NULL)
+ continue;
+ switch (c->type) {
+ case SSH_CHANNEL_CLOSED:
+ case SSH_CHANNEL_DYNAMIC:
+ case SSH_CHANNEL_X11_LISTENER:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_RPORT_LISTENER:
+ case SSH_CHANNEL_OPENING:
+ case SSH_CHANNEL_CONNECTING:
+ case SSH_CHANNEL_ZOMBIE:
+ continue;
+ case SSH_CHANNEL_LARVAL:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ case SSH_CHANNEL_OPEN:
+ case SSH_CHANNEL_X11_OPEN:
+ return i;
+ case SSH_CHANNEL_INPUT_DRAINING:
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ if (!compat13)
+ fatal("cannot happen: OUT_DRAIN");
+ return i;
+ default:
+ fatal("channel_find_open: bad channel type %d", c->type);
+ /* NOTREACHED */
+ }
+ }
+ return -1;
+}
+
+
+/*
+ * Returns a message describing the currently open forwarded connections,
+ * suitable for sending to the client. The message contains crlf pairs for
+ * newlines.
+ */
+
+char *
+channel_open_message(void)
+{
+ Buffer buffer;
+ Channel *c;
+ char buf[1024], *cp;
+ int i;
+
+ buffer_init(&buffer);
+ snprintf(buf, sizeof buf, "The following connections are open:\r\n");
+ buffer_append(&buffer, buf, strlen(buf));
+ for (i = 0; i < channels_alloc; i++) {
+ c = channels[i];
+ if (c == NULL)
+ continue;
+ switch (c->type) {
+ case SSH_CHANNEL_X11_LISTENER:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_RPORT_LISTENER:
+ case SSH_CHANNEL_CLOSED:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ case SSH_CHANNEL_ZOMBIE:
+ continue;
+ case SSH_CHANNEL_LARVAL:
+ case SSH_CHANNEL_OPENING:
+ case SSH_CHANNEL_CONNECTING:
+ case SSH_CHANNEL_DYNAMIC:
+ case SSH_CHANNEL_OPEN:
+ case SSH_CHANNEL_X11_OPEN:
+ case SSH_CHANNEL_INPUT_DRAINING:
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
+ c->self, c->remote_name,
+ c->type, c->remote_id,
+ c->istate, buffer_len(&c->input),
+ c->ostate, buffer_len(&c->output),
+ c->rfd, c->wfd);
+ buffer_append(&buffer, buf, strlen(buf));
+ continue;
+ default:
+ fatal("channel_open_message: bad channel type %d", c->type);
+ /* NOTREACHED */
+ }
+ }
+ buffer_append(&buffer, "\0", 1);
+ cp = xstrdup(buffer_ptr(&buffer));
+ buffer_free(&buffer);
+ return cp;
+}
+
+void
+channel_send_open(int id)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_send_open: %d: bad id", id);
+ return;
+ }
+ debug2("channel %d: send open", id);
+ packet_start(SSH2_MSG_CHANNEL_OPEN);
+ packet_put_cstring(c->ctype);
+ packet_put_int(c->self);
+ packet_put_int(c->local_window);
+ packet_put_int(c->local_maxpacket);
+ packet_send();
+}
+
+void
+channel_request_start(int id, char *service, int wantconfirm)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_request_start: %d: unknown channel id", id);
+ return;
+ }
+ debug2("channel %d: request %s", id, service) ;
+ packet_start(SSH2_MSG_CHANNEL_REQUEST);
+ packet_put_int(c->remote_id);
+ packet_put_cstring(service);
+ packet_put_char(wantconfirm);
+}
+void
+channel_register_confirm(int id, channel_callback_fn *fn)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_register_comfirm: %d: bad id", id);
+ return;
+ }
+ c->confirm = fn;
+}
+void
+channel_register_cleanup(int id, channel_callback_fn *fn)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_register_cleanup: %d: bad id", id);
+ return;
+ }
+ c->detach_user = fn;
+}
+void
+channel_cancel_cleanup(int id)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_cancel_cleanup: %d: bad id", id);
+ return;
+ }
+ c->detach_user = NULL;
+}
+void
+channel_register_filter(int id, channel_filter_fn *fn)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL) {
+ logit("channel_register_filter: %d: bad id", id);
+ return;
+ }
+ c->input_filter = fn;
+}
+
+void
+channel_set_fds(int id, int rfd, int wfd, int efd,
+ int extusage, int nonblock, u_int window_max)
+{
+ Channel *c = channel_lookup(id);
+
+ if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
+ fatal("channel_activate for non-larval channel %d.", id);
+ channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
+ c->type = SSH_CHANNEL_OPEN;
+ c->local_window = c->local_window_max = window_max;
+ packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+ packet_put_int(c->remote_id);
+ packet_put_int(c->local_window);
+ packet_send();
}
/*
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) {
if (buffer_len(&c->output) > 0) {
FD_SET(c->wfd, writeset);
} else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
- chan_obuf_empty(c);
+ if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
+ debug2("channel %d: obuf_empty delayed efd %d/(%d)",
+ c->self, c->efd, buffer_len(&c->extended));
+ else
+ chan_obuf_empty(c);
}
}
/** 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);
- else if (c->extended_usage == CHAN_EXTENDED_READ &&
+ else if (!(c->flags & CHAN_EOF_SENT) &&
+ c->extended_usage == CHAN_EXTENDED_READ &&
buffer_len(&c->extended) < c->remote_window)
FD_SET(c->efd, readset);
}
}
-void
+static void
channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->input) == 0) {
packet_put_int(c->remote_id);
packet_send();
c->type = SSH_CHANNEL_CLOSED;
- debug("channel %d: closing after input drain.", c->self);
+ debug2("channel %d: closing after input drain.", c->self);
}
}
-void
+static void
channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->output) == 0)
- channel_free(c->self);
+ chan_mark_dead(c);
else
FD_SET(c->sock, writeset);
}
* data in that packet is then substituted by the real data if it matches the
* fake data, and the channel is put into normal mode.
* XXX All this happens at the client side.
+ * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
*/
-int
-x11_open_helper(Channel *c)
+static int
+x11_open_helper(Buffer *b)
{
u_char *ucp;
u_int proto_len, data_len;
/* Check if the fixed size part of the packet is in buffer. */
- if (buffer_len(&c->output) < 12)
+ if (buffer_len(b) < 12)
return 0;
/* Parse the lengths of variable-length fields. */
- ucp = (u_char *) buffer_ptr(&c->output);
+ 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];
proto_len = ucp[6] + 256 * ucp[7];
data_len = ucp[8] + 256 * ucp[9];
} else {
- debug("Initial X11 packet contains bad byte order byte: 0x%x",
- ucp[0]);
+ debug2("Initial X11 packet contains bad byte order byte: 0x%x",
+ ucp[0]);
return -1;
}
/* Check if the whole packet is in buffer. */
- if (buffer_len(&c->output) <
+ if (buffer_len(b) <
12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
return 0;
/* Check if authentication protocol matches. */
if (proto_len != strlen(x11_saved_proto) ||
memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
- debug("X11 connection uses different authentication protocol.");
+ debug2("X11 connection uses different authentication protocol.");
return -1;
}
/* Check if authentication data matches our fake data. */
if (data_len != x11_fake_data_len ||
memcmp(ucp + 12 + ((proto_len + 3) & ~3),
x11_fake_data, x11_fake_data_len) != 0) {
- debug("X11 auth data does not match fake data.");
+ debug2("X11 auth data does not match fake data.");
return -1;
}
/* Check fake data length */
return 1;
}
-void
+static void
channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
{
- int ret = x11_open_helper(c);
+ int ret = x11_open_helper(&c->output);
+
if (ret == 1) {
/* Start normal processing for the channel. */
c->type = SSH_CHANNEL_OPEN;
* We have received an X11 connection that has bad
* authentication information.
*/
- log("X11 connection rejected because of wrong authentication.");
+ logit("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);
+ int ret = x11_open_helper(&c->output);
+
+ /* c->force_drain = 1; */
+
if (ret == 1) {
c->type = SSH_CHANNEL_OPEN;
+ channel_pre_open(c, readset, writeset);
+ } else if (ret == -1) {
+ logit("X11 connection rejected because of wrong authentication.");
+ debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
+ 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)
- channel_pre_open_20(c, readset, writeset);
+ chan_write_failed(c);
else
- channel_pre_open_15(c, readset, writeset);
- } else if (ret == -1) {
- debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
- chan_read_failed(c); /** force close? */
- chan_write_failed(c);
- debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
+ c->type = SSH_CHANNEL_OPEN;
+ debug2("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;
+ 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",
+
+ debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
c->self, host, c->host_port, s4_req.command);
if (s4_req.command != 1) {
return 1;
}
+/* try to decode a socks5 header */
+#define SSH_SOCKS5_AUTHDONE 0x1000
+#define SSH_SOCKS5_NOAUTH 0x00
+#define SSH_SOCKS5_IPV4 0x01
+#define SSH_SOCKS5_DOMAIN 0x03
+#define SSH_SOCKS5_IPV6 0x04
+#define SSH_SOCKS5_CONNECT 0x01
+#define SSH_SOCKS5_SUCCESS 0x00
+
+static int
+channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
+{
+ struct {
+ u_int8_t version;
+ u_int8_t command;
+ u_int8_t reserved;
+ u_int8_t atyp;
+ } s5_req, s5_rsp;
+ u_int16_t dest_port;
+ u_char *p, dest_addr[255+1];
+ int i, have, found, nmethods, addrlen, af;
+
+ debug2("channel %d: decode socks5", c->self);
+ p = buffer_ptr(&c->input);
+ if (p[0] != 0x05)
+ return -1;
+ have = buffer_len(&c->input);
+ if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
+ /* format: ver | nmethods | methods */
+ if (have < 2)
+ return 0;
+ nmethods = p[1];
+ if (have < nmethods + 2)
+ return 0;
+ /* look for method: "NO AUTHENTICATION REQUIRED" */
+ for (found = 0, i = 2 ; i < nmethods + 2; i++) {
+ if (p[i] == SSH_SOCKS5_NOAUTH ) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found) {
+ debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
+ c->self);
+ return -1;
+ }
+ buffer_consume(&c->input, nmethods + 2);
+ buffer_put_char(&c->output, 0x05); /* version */
+ buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
+ FD_SET(c->sock, writeset);
+ c->flags |= SSH_SOCKS5_AUTHDONE;
+ debug2("channel %d: socks5 auth done", c->self);
+ return 0; /* need more */
+ }
+ debug2("channel %d: socks5 post auth", c->self);
+ if (have < sizeof(s5_req)+1)
+ return 0; /* need more */
+ memcpy((char *)&s5_req, p, sizeof(s5_req));
+ if (s5_req.version != 0x05 ||
+ s5_req.command != SSH_SOCKS5_CONNECT ||
+ s5_req.reserved != 0x00) {
+ debug2("channel %d: only socks5 connect supported", c->self);
+ return -1;
+ }
+ switch(s5_req.atyp){
+ case SSH_SOCKS5_IPV4:
+ addrlen = 4;
+ af = AF_INET;
+ break;
+ case SSH_SOCKS5_DOMAIN:
+ addrlen = p[sizeof(s5_req)];
+ af = -1;
+ break;
+ case SSH_SOCKS5_IPV6:
+ addrlen = 16;
+ af = AF_INET6;
+ break;
+ default:
+ debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
+ return -1;
+ }
+ if (have < 4 + addrlen + 2)
+ return 0;
+ buffer_consume(&c->input, sizeof(s5_req));
+ if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
+ buffer_consume(&c->input, 1); /* host string length */
+ buffer_get(&c->input, (char *)&dest_addr, addrlen);
+ buffer_get(&c->input, (char *)&dest_port, 2);
+ dest_addr[addrlen] = '\0';
+ if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
+ strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
+ else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
+ return -1;
+ c->host_port = ntohs(dest_port);
+
+ debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
+ c->self, c->path, c->host_port, s5_req.command);
+
+ s5_rsp.version = 0x05;
+ s5_rsp.command = SSH_SOCKS5_SUCCESS;
+ s5_rsp.reserved = 0; /* ignored */
+ s5_rsp.atyp = SSH_SOCKS5_IPV4;
+ ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
+ dest_port = 0; /* ignored */
+
+ buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
+ buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
+ buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
+ return 1;
+}
+
/* 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. */
- if (have < 4) {
+ if (have < 3) {
/* need more */
FD_SET(c->sock, readset);
return;
case 0x04:
ret = channel_decode_socks4(c, readset, writeset);
break;
+ case 0x05:
+ ret = channel_decode_socks5(c, readset, writeset);
+ break;
default:
ret = -1;
break;
}
if (ret < 0) {
- channel_free(c->self);
+ chan_mark_dead(c);
} else if (ret == 0) {
debug2("channel %d: pre_dynamic: need more", c->self);
/* need more */
}
/* 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, newch;
+ int newsock;
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) {
+ debug2("single_connection: closing X11 listener.");
+ channel_close_fd(&c->sock);
+ chan_mark_dead(c);
+ }
if (newsock < 0) {
error("accept: %.100s", strerror(errno));
return;
}
+ set_nodelay(newsock);
remote_ipaddr = get_peer_ipaddr(newsock);
remote_port = get_peer_port(newsock);
snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
remote_ipaddr, remote_port);
- newch = channel_new("x11",
+ nc = channel_new("accepted x11 socket",
SSH_CHANNEL_OPENING, newsock, newsock, -1,
- c->local_window_max, c->local_maxpacket,
- 0, xstrdup(buf), 1);
+ c->local_window_max, c->local_maxpacket, 0, buf, 1);
if (compat20) {
packet_start(SSH2_MSG_CHANNEL_OPEN);
packet_put_cstring("x11");
- packet_put_int(newch);
- packet_put_int(c->local_window_max);
- packet_put_int(c->local_maxpacket);
+ packet_put_int(nc->self);
+ 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) {
- debug("ssh2 x11 bug compat mode");
+ debug2("ssh2 x11 bug compat mode");
} else {
packet_put_int(remote_port);
}
packet_send();
} else {
packet_start(SSH_SMSG_X11_OPEN);
- packet_put_int(newch);
- if (have_hostname_in_open)
- packet_put_string(buf, strlen(buf));
+ packet_put_int(nc->self);
+ if (packet_get_protocol_flags() &
+ SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
+ packet_put_cstring(buf);
packet_send();
}
xfree(remote_ipaddr);
}
}
-void
+static void
port_open_helper(Channel *c, char *rtype)
{
int direct;
packet_put_int(c->self);
packet_put_cstring(c->path);
packet_put_int(c->host_port);
- if (have_hostname_in_open)
+ if (packet_get_protocol_flags() &
+ SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
packet_put_cstring(c->remote_name);
packet_send();
}
/*
* 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;
struct sockaddr addr;
- int newsock, newch, nextstate;
+ int newsock, nextstate;
socklen_t addrlen;
char *rtype;
"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) ? 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);
error("accept: %.100s", strerror(errno));
return;
}
- newch = channel_new(rtype,
- nextstate, newsock, newsock, -1,
- c->local_window_max, c->local_maxpacket,
- 0, xstrdup(rtype), 1);
-
- nc = channel_lookup(newch);
- if (nc == NULL) {
- error("xxx: no new channel:");
- return;
- }
+ set_nodelay(newsock);
+ nc = channel_new(rtype, nextstate, newsock, newsock, -1,
+ c->local_window_max, c->local_maxpacket, 0, rtype, 1);
nc->listening_port = c->listening_port;
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;
+ int newsock;
struct sockaddr addr;
- int newsock, newch;
socklen_t addrlen;
if (FD_ISSET(c->sock, readset)) {
error("accept from auth socket: %.100s", strerror(errno));
return;
}
- newch = channel_new("accepted auth socket",
+ nc = channel_new("accepted auth socket",
SSH_CHANNEL_OPENING, newsock, newsock, -1,
c->local_window_max, c->local_maxpacket,
- 0, xstrdup("accepted auth socket"), 1);
+ 0, "accepted auth socket", 1);
if (compat20) {
packet_start(SSH2_MSG_CHANNEL_OPEN);
packet_put_cstring("auth-agent@openssh.com");
- packet_put_int(newch);
+ packet_put_int(nc->self);
packet_put_int(c->local_window_max);
packet_put_int(c->local_maxpacket);
} else {
packet_start(SSH_SMSG_AGENT_OPEN);
- packet_put_int(newch);
+ packet_put_int(nc->self);
}
packet_send();
}
}
-void
+static void
channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
{
+ int err = 0;
+ socklen_t sz = sizeof(err);
+
if (FD_ISSET(c->sock, writeset)) {
- int err = 0;
- int sz = sizeof(err);
- c->type = SSH_CHANNEL_OPEN;
- if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) < 0) {
- debug("getsockopt SO_ERROR failed");
+ if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
+ err = errno;
+ error("getsockopt SO_ERROR failed");
+ }
+ if (err == 0) {
+ debug("channel %d: connected", c->self);
+ c->type = SSH_CHANNEL_OPEN;
+ if (compat20) {
+ packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
+ packet_put_int(c->remote_id);
+ packet_put_int(c->self);
+ packet_put_int(c->local_window);
+ packet_put_int(c->local_maxpacket);
+ } else {
+ packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+ packet_put_int(c->remote_id);
+ packet_put_int(c->self);
+ }
} else {
- if (err == 0) {
- debug("channel %d: connected)", c->self);
+ debug("channel %d: not connected: %s",
+ c->self, strerror(err));
+ if (compat20) {
+ packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(c->remote_id);
+ packet_put_int(SSH2_OPEN_CONNECT_FAILED);
+ if (!(datafellows & SSH_BUG_OPENFAILURE)) {
+ packet_put_cstring(strerror(err));
+ packet_put_cstring("");
+ }
} else {
- debug("channel %d: not connected: %s",
- c->self, strerror(err));
- chan_read_failed(c);
- chan_write_failed(c);
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(c->remote_id);
}
+ chan_mark_dead(c);
}
+ packet_send();
}
}
-int
+static int
channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
{
char buf[16*1024];
if (len < 0 && (errno == EINTR || errno == EAGAIN))
return 1;
if (len <= 0) {
- debug("channel %d: read<=0 rfd %d len %d",
+ debug2("channel %d: read<=0 rfd %d len %d",
c->self, c->rfd, len);
if (c->type != SSH_CHANNEL_OPEN) {
- debug("channel %d: not open", c->self);
- channel_free(c->self);
+ debug2("channel %d: not open", c->self);
+ 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: status set to input draining.", c->self);
+ debug2("channel %d: input draining.", c->self);
} else {
chan_read_failed(c);
}
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);
+ debug2("channel %d: filter stops", c->self);
chan_read_failed(c);
}
} else {
}
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);
+#ifdef _AIX
+ /* XXX: Later AIX versions can't push as much data to tty */
+ if (compat20 && c->wfd_isatty)
+ dlen = MIN(dlen, 8*1024);
+#endif
+ len = write(c->wfd, data, dlen);
if (len < 0 && (errno == EINTR || errno == EAGAIN))
return 1;
if (len <= 0) {
if (c->type != SSH_CHANNEL_OPEN) {
- debug("channel %d: not open", c->self);
- channel_free(c->self);
+ debug2("channel %d: not open", c->self);
+ chan_mark_dead(c);
return -1;
} else if (compat13) {
- buffer_consume(&c->output, buffer_len(&c->output));
- debug("channel %d: status set to input draining.", c->self);
+ buffer_clear(&c->output);
+ debug2("channel %d: input draining.", c->self);
c->type = SSH_CHANNEL_INPUT_DRAINING;
} else {
chan_write_failed(c);
}
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 &&
c->self, c->local_window,
c->local_consumed);
c->local_window += c->local_consumed;
- c->local_consumed = 0;
- }
- 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);
+ c->local_consumed = 0;
+ }
+ return 1;
}
-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;
+
/* Send buffered output data to the socket. */
if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
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;
+ debug2("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;
+ debug2("channel %d: gc: user detached", c->self);
+ }
+ if (!chan_is_dead(c, 1))
+ return;
+ debug2("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;
did_init = 1;
}
for (i = 0; i < channels_alloc; i++) {
- c = &channels[i];
- if (c->type == SSH_CHANNEL_FREE)
- continue;
- if (ftab[c->type] == NULL)
+ c = channels[i];
+ if (c == NULL)
continue;
- (*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->self);
- }
+ if (ftab[c->type] != NULL)
+ (*ftab[c->type])(c, readset, writeset);
+ channel_garbage_collect(c);
}
}
+/*
+ * Allocate/update select bitmasks and add any bits relevant to channels in
+ * select bitmasks.
+ */
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);
channel_handler(channel_pre, *readsetp, *writesetp);
}
+/*
+ * After select, perform any appropriate operations for channels which have
+ * events pending.
+ */
void
channel_after_select(fd_set * readset, fd_set * writeset)
{
channel_handler(channel_post, readset, writeset);
}
+
/* 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;
+ int i;
+ u_int len;
for (i = 0; i < channels_alloc; i++) {
- c = &channels[i];
+ c = channels[i];
+ if (c == NULL)
+ continue;
- /* We are only interested in channels that can have buffered incoming data. */
+ /*
+ * We are only interested in channels that can have buffered
+ * incoming data.
+ */
if (compat13) {
if (c->type != SSH_CHANNEL_OPEN &&
c->type != SSH_CHANNEL_INPUT_DRAINING)
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;
}
if ((c->istate == CHAN_INPUT_OPEN ||
c->istate == CHAN_INPUT_WAIT_DRAIN) &&
(len = buffer_len(&c->input)) > 0) {
- /* Send some data for the other side over the secure connection. */
+ /*
+ * Send some data for the other side over the secure
+ * connection.
+ */
if (compat20) {
if (len > c->remote_window)
len = c->remote_window;
fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
/*
* input-buffer is empty and read-socket shutdown:
- * tell peer, that we will not send more data: send IEOF
+ * tell peer, that we will not send more data: send IEOF.
+ * hack for extended data: delay EOF if EFD still in use.
*/
- chan_ibuf_empty(c);
+ if (CHANNEL_EFD_INPUT_ACTIVE(c))
+ debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
+ c->self, c->efd, buffer_len(&c->extended));
+ else
+ chan_ibuf_empty(c);
}
/* Send extended data, i.e. stderr */
if (compat20 &&
+ !(c->flags & CHAN_EOF_SENT) &&
c->remote_window > 0 &&
(len = buffer_len(&c->extended)) > 0 &&
c->extended_usage == CHAN_EXTENDED_READ) {
- debug2("channel %d: rwin %d elen %d euse %d",
+ debug2("channel %d: rwin %u elen %u euse %d",
c->self, c->remote_window, buffer_len(&c->extended),
c->extended_usage);
if (len > c->remote_window)
}
}
-/*
- * This is called when a packet of type CHANNEL_DATA has just been received.
- * The message type has already been consumed, but channel number and data is
- * still there.
- */
+
+/* -- 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;
c->type != SSH_CHANNEL_X11_OPEN)
return;
- /* same for protocol 1.5 if output end is no longer open */
- if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
- return;
-
/* Get the data. */
data = packet_get_string(&data_len);
- packet_done();
- if (compat20){
+ /*
+ * Ignore data for protocol > 1.3 if output end is no longer open.
+ * For protocol 2 the sending side is reducing its window as it sends
+ * data, so we must 'fake' consumption of the data in order to ensure
+ * that window updates are sent back. Otherwise the connection might
+ * deadlock.
+ */
+ if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
+ if (compat20) {
+ c->local_window -= data_len;
+ c->local_consumed += data_len;
+ }
+ xfree(data);
+ return;
+ }
+
+ if (compat20) {
if (data_len > c->local_maxpacket) {
- log("channel %d: rcvd big packet %d, maxpack %d",
+ logit("channel %d: rcvd big packet %d, maxpack %d",
c->self, data_len, c->local_maxpacket);
}
if (data_len > c->local_window) {
- log("channel %d: rcvd too much data %d, win %d",
+ logit("channel %d: rcvd too much data %d, win %d",
c->self, data_len, c->local_window);
xfree(data);
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;
char *data;
- u_int data_len;
+ u_int data_len, tcode;
Channel *c;
/* Get the channel number and verify it. */
if (c == NULL)
packet_disconnect("Received extended_data for bad channel %d.", id);
if (c->type != SSH_CHANNEL_OPEN) {
- log("channel %d: ext data for non open", id);
+ logit("channel %d: ext data for non open", id);
return;
}
+ if (c->flags & CHAN_EOF_RCVD) {
+ if (datafellows & SSH_BUG_EXTEOF)
+ debug("channel %d: accepting ext data after eof", id);
+ else
+ packet_disconnect("Received extended_data after EOF "
+ "on channel %d.", id);
+ }
tcode = packet_get_int();
if (c->efd == -1 ||
c->extended_usage != CHAN_EXTENDED_WRITE ||
tcode != SSH2_EXTENDED_DATA_STDERR) {
- log("channel %d: bad ext data", c->self);
+ logit("channel %d: bad ext data", c->self);
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",
+ logit("channel %d: rcvd too much extended_data %d, win %d",
c->self, data_len, c->local_window);
xfree(data);
return;
xfree(data);
}
-
-/*
- * 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()
-{
- u_int i;
- Channel *c;
-
- for (i = 0; i < channels_alloc; i++) {
- c = &channels[i];
- if (c->type == SSH_CHANNEL_OPEN) {
- if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
- debug("channel %d: big input buffer %d",
- c->self, buffer_len(&c->input));
- return 0;
- }
- if (buffer_len(&c->output) > packet_get_maxsize()) {
- debug("channel %d: big output buffer %d",
- c->self, buffer_len(&c->output));
- return 0;
- }
- }
- }
- return 1;
-}
-
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;
+ if (buffer_len(&c->input) == 0)
+ chan_ibuf_empty(c);
+ }
+
}
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);
if (c->type != SSH_CHANNEL_CLOSED)
packet_disconnect("Received close confirmation for "
"non-closed channel %d (type %d).", id, c->type);
- channel_free(c->self);
+ channel_free(c);
}
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) {
+ if (c->confirm) {
debug2("callback start");
- c->cb_fn(c->self, c->cb_arg);
+ c->confirm(c->self, NULL);
debug2("callback done");
}
- debug("channel %d: open confirm rwindow %d rmax %d", c->self,
+ debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
c->remote_window, c->remote_maxpacket);
}
+ packet_check_eom();
+}
+
+static char *
+reason2txt(int reason)
+{
+ switch (reason) {
+ case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
+ return "administratively prohibited";
+ case SSH2_OPEN_CONNECT_FAILED:
+ return "connect failed";
+ case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
+ return "unknown channel type";
+ case SSH2_OPEN_RESOURCE_SHORTAGE:
+ return "resource shortage";
+ }
+ return "unknown reason";
}
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_open_failure: %d: reason %d %s", id,
- reason, msg ? msg : "<no additional info>");
+ logit("channel %d: open failed: %s%s%s", id,
+ reason2txt(reason), msg ? ": ": "", msg ? msg : "");
if (msg != NULL)
xfree(msg);
if (lang != NULL)
xfree(lang);
}
+ packet_check_eom();
/* Free the channel. This will also close the socket. */
- channel_free(id);
-}
-
-void
-channel_input_channel_request(int type, int plen, void *ctxt)
-{
- int id;
- Channel *c;
-
- id = packet_get_int();
- c = channel_lookup(id);
-
- if (c == NULL ||
- (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
- packet_disconnect("Received request for "
- "non-open channel %d.", id);
- if (c->cb_fn != NULL && c->cb_event == type) {
- debug2("callback start");
- c->cb_fn(c->self, c->cb_arg);
- debug2("callback done");
- } else {
- char *service = packet_get_string(NULL);
- debug("channel %d: rcvd request for %s", c->self, service);
- debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
- xfree(service);
- }
+ channel_free(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;
+ int id;
+ u_int adjust;
if (!compat20)
return;
c = channel_lookup(id);
if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
- log("Received window adjust for "
+ logit("Received window adjust for "
"non-open channel %d.", id);
return;
}
adjust = packet_get_int();
- packet_done();
- debug2("channel %d: rcvd adjust %d", id, adjust);
+ packet_check_eom();
+ debug2("channel %d: rcvd adjust %u", id, adjust);
c->remote_window += adjust;
}
-/*
- * Stops listening for channels, and removes any unix domain sockets that we
- * might have.
- */
-
-void
-channel_stop_listening()
-{
- int i;
- for (i = 0; i < channels_alloc; i++) {
- switch (channels[i].type) {
- case SSH_CHANNEL_AUTH_SOCKET:
- close(channels[i].sock);
- unlink(channels[i].path);
- channel_free(i);
- break;
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_RPORT_LISTENER:
- case SSH_CHANNEL_X11_LISTENER:
- close(channels[i].sock);
- channel_free(i);
- 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].type != SSH_CHANNEL_FREE)
- channel_close_fds(&channels[i]);
-}
-
-/* Returns true if any channel is still open. */
-
-int
-channel_still_open()
-{
- u_int i;
- for (i = 0; i < channels_alloc; i++)
- switch (channels[i].type) {
- case SSH_CHANNEL_FREE:
- case SSH_CHANNEL_X11_LISTENER:
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_RPORT_LISTENER:
- case SSH_CHANNEL_CLOSED:
- case SSH_CHANNEL_AUTH_SOCKET:
- case SSH_CHANNEL_DYNAMIC:
- case SSH_CHANNEL_CONNECTING: /* XXX ??? */
- continue;
- case SSH_CHANNEL_LARVAL:
- if (!compat20)
- fatal("cannot happen: SSH_CHANNEL_LARVAL");
- continue;
- case SSH_CHANNEL_OPENING:
- case SSH_CHANNEL_OPEN:
- case SSH_CHANNEL_X11_OPEN:
- return 1;
- case SSH_CHANNEL_INPUT_DRAINING:
- case SSH_CHANNEL_OUTPUT_DRAINING:
- if (!compat13)
- fatal("cannot happen: OUT_DRAIN");
- return 1;
- default:
- fatal("channel_still_open: bad channel type %d", channels[i].type);
- /* NOTREACHED */
- }
- return 0;
-}
-
-/* Returns the id of an open channel suitable for keepaliving */
-
-int
-channel_find_open()
+channel_input_port_open(int type, u_int32_t seq, void *ctxt)
{
- u_int i;
- for (i = 0; i < channels_alloc; i++)
- switch (channels[i].type) {
- case SSH_CHANNEL_CLOSED:
- case SSH_CHANNEL_DYNAMIC:
- case SSH_CHANNEL_FREE:
- case SSH_CHANNEL_X11_LISTENER:
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_RPORT_LISTENER:
- case SSH_CHANNEL_OPENING:
- continue;
- case SSH_CHANNEL_LARVAL:
- case SSH_CHANNEL_AUTH_SOCKET:
- case SSH_CHANNEL_CONNECTING: /* XXX ??? */
- case SSH_CHANNEL_OPEN:
- case SSH_CHANNEL_X11_OPEN:
- return i;
- case SSH_CHANNEL_INPUT_DRAINING:
- case SSH_CHANNEL_OUTPUT_DRAINING:
- if (!compat13)
- fatal("cannot happen: OUT_DRAIN");
- return i;
- default:
- fatal("channel_find_open: bad channel type %d", channels[i].type);
- /* NOTREACHED */
- }
- return -1;
-}
-
-
-/*
- * Returns a message describing the currently open forwarded connections,
- * suitable for sending to the client. The message contains crlf pairs for
- * newlines.
- */
+ Channel *c = NULL;
+ u_short host_port;
+ char *host, *originator_string;
+ int remote_id, sock = -1;
-char *
-channel_open_message()
-{
- Buffer buffer;
- int i;
- char buf[512], *cp;
+ remote_id = packet_get_int();
+ host = packet_get_string(NULL);
+ host_port = packet_get_int();
- buffer_init(&buffer);
- snprintf(buf, sizeof buf, "The following connections are open:\r\n");
- buffer_append(&buffer, buf, strlen(buf));
- for (i = 0; i < channels_alloc; i++) {
- Channel *c = &channels[i];
- switch (c->type) {
- case SSH_CHANNEL_FREE:
- case SSH_CHANNEL_X11_LISTENER:
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_RPORT_LISTENER:
- case SSH_CHANNEL_CLOSED:
- case SSH_CHANNEL_AUTH_SOCKET:
- continue;
- case SSH_CHANNEL_LARVAL:
- case SSH_CHANNEL_OPENING:
- case SSH_CHANNEL_CONNECTING:
- case SSH_CHANNEL_DYNAMIC:
- case SSH_CHANNEL_OPEN:
- case SSH_CHANNEL_X11_OPEN:
- case SSH_CHANNEL_INPUT_DRAINING:
- case SSH_CHANNEL_OUTPUT_DRAINING:
- snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
- c->self, c->remote_name,
- c->type, c->remote_id,
- c->istate, buffer_len(&c->input),
- c->ostate, buffer_len(&c->output),
- c->rfd, c->wfd);
- buffer_append(&buffer, buf, strlen(buf));
- continue;
- default:
- fatal("channel_open_message: bad channel type %d", c->type);
- /* NOTREACHED */
- }
+ if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
+ originator_string = packet_get_string(NULL);
+ } else {
+ originator_string = xstrdup("unknown (remote did not supply name)");
+ }
+ packet_check_eom();
+ sock = channel_connect_to(host, host_port);
+ if (sock != -1) {
+ c = channel_new("connected socket",
+ SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
+ originator_string, 1);
+ c->remote_id = remote_id;
+ }
+ xfree(originator_string);
+ if (c == NULL) {
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_id);
+ packet_send();
}
- buffer_append(&buffer, "\0", 1);
- cp = xstrdup(buffer_ptr(&buffer));
- buffer_free(&buffer);
- return cp;
+ xfree(host);
}
-/*
- * Initiate forwarding of connections to local port "port" through the secure
- * channel to host:port from remote side.
- */
-int
-channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
- u_short port_to_connect, int gateway_ports)
+
+/* -- tcp forwarding */
+
+void
+channel_set_af(int af)
{
- return channel_request_forwarding(
- NULL, listen_port,
- host_to_connect, port_to_connect,
- gateway_ports, /*remote_fwd*/ 0);
+ IPv4or6 = af;
}
-/*
- * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
- * (SSH_CHANNEL_RPORT_LISTENER).
- */
-int
-channel_request_forwarding(
- const char *listen_address, u_short listen_port,
- const char *host_to_connect, u_short port_to_connect,
- int gateway_ports, int remote_fwd)
+static int
+channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
+ const char *host_to_connect, u_short port_to_connect, int gateway_ports)
{
- int success, ch, sock, on = 1, ctype;
+ Channel *c;
+ int success, sock, on = 1;
struct addrinfo hints, *ai, *aitop;
- char ntop[NI_MAXHOST], strport[NI_MAXSERV];
const char *host;
- struct linger linger;
+ char ntop[NI_MAXHOST], strport[NI_MAXSERV];
success = 0;
+ host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
+ listen_addr : host_to_connect;
- if (remote_fwd) {
- host = listen_address;
- ctype = SSH_CHANNEL_RPORT_LISTENER;
- } else {
- host = host_to_connect;
- ctype =SSH_CHANNEL_PORT_LISTENER;
+ if (host == NULL) {
+ error("No forward host name.");
+ return success;
}
-
- if (strlen(host) > sizeof(channels[0].path) - 1) {
+ if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
error("Forward host name too long.");
return success;
}
- /* XXX listen_address is currently ignored */
/*
* getaddrinfo returns a loopback address if the hostname is
* set to NULL and hints.ai_flags is not AI_PASSIVE
continue;
if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
- error("channel_request_forwarding: getnameinfo failed");
+ error("channel_setup_fwd_listener: getnameinfo failed");
continue;
}
/* Create a port to listen for the host. */
- sock = socket(ai->ai_family, SOCK_STREAM, 0);
+ sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0) {
/* this is no error since kernel may not support ipv6 */
verbose("socket: %.100s", strerror(errno));
continue;
}
/*
- * Set socket options. We would like the socket to disappear
- * as soon as it has been closed for whatever reason.
+ * Set socket options.
+ * Allow local port reuse in TIME_WAIT.
*/
- setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
- linger.l_onoff = 1;
- linger.l_linger = 5;
- setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
+ sizeof(on)) == -1)
+ error("setsockopt SO_REUSEADDR: %s", strerror(errno));
+
debug("Local forwarding listening on %s port %s.", ntop, strport);
/* Bind the socket to the address. */
continue;
}
/* Start listening for connections on the socket. */
- if (listen(sock, 5) < 0) {
+ if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
error("listen: %.100s", strerror(errno));
close(sock);
continue;
}
/* Allocate a channel number for the socket. */
- ch = channel_new("port listener", ctype, sock, sock, -1,
+ c = channel_new("port listener", type, sock, sock, -1,
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
- 0, xstrdup("port listener"), 1);
- strlcpy(channels[ch].path, host, sizeof(channels[ch].path));
- channels[ch].host_port = port_to_connect;
- channels[ch].listening_port = listen_port;
+ 0, "port listener", 1);
+ strlcpy(c->path, host, sizeof(c->path));
+ c->host_port = port_to_connect;
+ c->listening_port = listen_port;
success = 1;
}
if (success == 0)
- error("channel_request_forwarding: cannot listen to port: %d",
+ error("channel_setup_fwd_listener: cannot listen to port: %d",
listen_port);
freeaddrinfo(aitop);
return success;
}
+/* protocol local port fwd, used by ssh (and sshd in v1) */
+int
+channel_setup_local_fwd_listener(u_short listen_port,
+ const char *host_to_connect, u_short port_to_connect, int gateway_ports)
+{
+ return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
+ NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
+}
+
+/* protocol v2 remote port fwd, used by sshd */
+int
+channel_setup_remote_fwd_listener(const char *listen_address,
+ u_short listen_port, int gateway_ports)
+{
+ return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
+ listen_address, listen_port, NULL, 0, gateway_ports);
+}
+
/*
* Initiate forwarding of connections to port "port" on remote host through
* the secure channel to host:port from local 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)
const char *address_to_bind = "0.0.0.0";
packet_start(SSH2_MSG_GLOBAL_REQUEST);
packet_put_cstring("tcpip-forward");
- packet_put_char(0); /* boolean: want reply */
+ packet_put_char(1); /* boolean: want reply */
packet_put_cstring(address_to_bind);
packet_put_int(listen_port);
packet_send();
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;
break;
case SSH_SMSG_FAILURE:
- log("Warning: Server denied remote port forwarding.");
+ logit("Warning: Server denied remote port forwarding.");
break;
default:
/* Unknown packet */
* privileged port.
*/
if (port < IPPORT_RESERVED && !is_root)
- packet_disconnect("Requested forwarding of port %d but user is not root.",
- port);
+ packet_disconnect(
+ "Requested forwarding of port %d but user is not root.",
+ port);
+ if (host_port == 0)
+ packet_disconnect("Dynamic forwarding denied.");
#endif
+
/* Initiate forwarding */
- channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
+ channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
/* Free the argument string. */
xfree(hostname);
* 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;
error("connect_to: getnameinfo failed");
continue;
}
- sock = socket(ai->ai_family, SOCK_STREAM, 0);
+ sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0) {
- error("socket: %.100s", strerror(errno));
+ if (ai->ai_next == NULL)
+ error("socket: %.100s", strerror(errno));
+ else
+ verbose("socket: %.100s", strerror(errno));
continue;
}
if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
return -1;
}
/* success */
+ set_nodelay(sock);
return sock;
}
int
-channel_connect_by_listen_adress(u_short listen_port)
+channel_connect_by_listen_address(u_short listen_port)
{
int i;
}
if (!permit) {
- log("Received request to connect to host %.100s port %d, "
+ logit("Received request to connect to host %.100s port %d, "
"but the request was denied.", host, port);
return -1;
}
return connect_to(host, port);
}
-/*
- * This is called after receiving PORT_OPEN message. This attempts to
- * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
- * or CHANNEL_OPEN_FAILURE.
- */
-
-void
-channel_input_port_open(int type, int plen, void *ctxt)
-{
- u_short host_port;
- char *host, *originator_string;
- int remote_channel, sock = -1, newch;
-
- remote_channel = packet_get_int();
- host = packet_get_string(NULL);
- host_port = packet_get_int();
-
- if (have_hostname_in_open) {
- originator_string = packet_get_string(NULL);
- } else {
- originator_string = xstrdup("unknown (remote did not supply name)");
- }
- packet_done();
- sock = channel_connect_to(host, host_port);
- if (sock != -1) {
- newch = channel_allocate(SSH_CHANNEL_CONNECTING,
- sock, originator_string);
- channels[newch].remote_id = remote_channel;
-
- /*XXX delay answer? */
- packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
- packet_put_int(remote_channel);
- packet_put_int(newch);
- packet_send();
- } else {
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_channel);
- packet_send();
- }
- xfree(host);
-}
+/* -- X11 forwarding */
/*
* 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 0 and a suitable display number for the DISPLAY variable
+ * stored in display_numberp , or -1 if an error occurs.
*/
-
-#define NUM_SOCKS 10
-
-char *
-x11_create_display_inet(int screen_number, int x11_display_offset)
+int
+x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
+ int single_connection, u_int *display_numberp)
{
+ 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 = x11_use_localhost ? 0: AI_PASSIVE;
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)
continue;
- sock = socket(ai->ai_family, SOCK_STREAM, 0);
+ sock = socket(ai->ai_family, ai->ai_socktype,
+ ai->ai_protocol);
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);
continue;
}
}
+#ifdef IPV6_V6ONLY
+ if (ai->ai_family == AF_INET6) {
+ int on = 1;
+ if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
+ error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
+ }
+#endif
if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
- debug("bind port %d: %.100s", port, strerror(errno));
- shutdown(sock, SHUT_RDWR);
+ debug2("bind port %d: %.100s", port, strerror(errno));
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 (num_socks == NUM_SOCKS)
break;
#else
- break;
+ if (x11_use_localhost) {
+ if (num_socks == NUM_SOCKS)
+ break;
+ } else {
+ break;
+ }
#endif
}
freeaddrinfo(aitop);
}
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) {
+ if (listen(sock, SSH_LISTEN_BACKLOG) < 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);
+ 0, "X11 inet listener", 1);
+ 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. */
+ *display_numberp = display_number;
+ return (0);
}
-#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;
}
/* 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;
}
}
for (ai = aitop; ai; ai = ai->ai_next) {
/* Create a socket. */
- sock = socket(ai->ai_family, SOCK_STREAM, 0);
+ sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0) {
- debug("socket: %.100s", strerror(errno));
+ debug2("socket: %.100s", strerror(errno));
continue;
}
/* Connect it to the display. */
if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
- debug("connect %.100s port %d: %.100s", buf,
+ debug2("connect %.100s port %d: %.100s", buf,
6000 + display_number, strerror(errno));
close(sock);
continue;
strerror(errno));
return -1;
}
+ set_nodelay(sock);
return sock;
}
*/
void
-x11_input_open(int type, int plen, void *ctxt)
+x11_input_open(int type, u_int32_t seq, void *ctxt)
{
- int remote_channel, sock = 0, newch;
+ Channel *c = NULL;
+ int remote_id, sock = 0;
char *remote_host;
- u_int remote_len;
- /* Get remote channel number. */
- remote_channel = packet_get_int();
+ debug("Received X11 open request.");
+
+ remote_id = packet_get_int();
- /* Get remote originator name. */
- if (have_hostname_in_open) {
- remote_host = packet_get_string(&remote_len);
- remote_len += 4;
+ if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
+ remote_host = packet_get_string(NULL);
} else {
remote_host = xstrdup("unknown (remote did not supply name)");
- remote_len = 0;
}
-
- debug("Received X11 open request.");
- packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN);
+ packet_check_eom();
/* Obtain a connection to the real X display. */
sock = x11_connect_display();
- if (sock == -1) {
+ if (sock != -1) {
+ /* Allocate a channel for this connection. */
+ c = channel_new("connected x11 socket",
+ SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
+ remote_host, 1);
+ c->remote_id = remote_id;
+ c->force_drain = 1;
+ }
+ xfree(remote_host);
+ if (c == NULL) {
/* Send refusal to the remote host. */
packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_channel);
- packet_send();
+ packet_put_int(remote_id);
} else {
- /* Allocate a channel for this connection. */
- newch = channel_allocate(
- (x11_saved_proto == NULL) ?
- SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN,
- sock, remote_host);
- channels[newch].remote_id = remote_channel;
-
/* Send a confirmation to the remote host. */
packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
- packet_put_int(remote_channel);
- packet_put_int(newch);
- packet_send();
+ packet_put_int(remote_id);
+ packet_put_int(c->self);
}
+ packet_send();
}
/* 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.");
/*
* Requests forwarding of X11 connections, generates fake authentication
* data, and enables authentication spoofing.
+ * This should be called in the client only.
*/
-
void
x11_request_forwarding_with_spoofing(int client_session_id,
const char *proto, const char *data)
xfree(new_data);
}
+
+/* -- agent forwarding */
+
/* 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();
packet_write_wait();
}
-
-/*
- * Returns the name of the forwarded authentication socket. Returns NULL if
- * there is no forwarded authentication socket. The returned value points to
- * a static buffer.
- */
-
-char *
-auth_get_socket_name()
-{
- return channel_forwarded_auth_socket_name;
-}
-
-/* removes the agent forwarding socket */
-
-void
-cleanup_socket(void)
-{
- unlink(channel_forwarded_auth_socket_name);
- rmdir(channel_forwarded_auth_socket_dir);
-}
-
-/*
- * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
- * This starts forwarding authentication requests.
- */
-
-int
-auth_input_request_forwarding(struct passwd * pw)
-{
- int sock, newch;
- struct sockaddr_un sunaddr;
-
- if (auth_get_socket_name() != NULL)
- fatal("Protocol error: authentication forwarding requested twice.");
-
- /* Temporarily drop privileged uid for mkdir/bind. */
- temporarily_use_uid(pw);
-
- /* Allocate a buffer for the socket name, and format the name. */
- channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
- channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
- strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
-
- /* Create private directory for socket */
- if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
- packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
- strerror(errno));
- restore_uid();
- xfree(channel_forwarded_auth_socket_name);
- xfree(channel_forwarded_auth_socket_dir);
- channel_forwarded_auth_socket_name = NULL;
- channel_forwarded_auth_socket_dir = NULL;
- return 0;
- }
- snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
- channel_forwarded_auth_socket_dir, (int) getpid());
-
- if (atexit(cleanup_socket) < 0) {
- int saved = errno;
- cleanup_socket();
- packet_disconnect("socket: %.100s", strerror(saved));
- }
- /* Create the socket. */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0)
- packet_disconnect("socket: %.100s", strerror(errno));
-
- /* Bind it to the name. */
- memset(&sunaddr, 0, sizeof(sunaddr));
- sunaddr.sun_family = AF_UNIX;
- strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
- sizeof(sunaddr.sun_path));
-
- if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
- packet_disconnect("bind: %.100s", strerror(errno));
-
- /* Restore the privileged uid. */
- restore_uid();
-
- /* Start listening on the socket. */
- if (listen(sock, 5) < 0)
- packet_disconnect("listen: %.100s", strerror(errno));
-
- /* Allocate a channel for the authentication agent socket. */
- newch = channel_new("auth socket",
- SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
- CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
- 0, xstrdup("auth socket"), 1);
-
- strlcpy(channels[newch].path, channel_forwarded_auth_socket_name,
- sizeof(channels[newch].path));
- return 1;
-}
-
-/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
-
-void
-auth_input_open_request(int type, int plen, void *ctxt)
-{
- int remch, sock, newch;
- char *dummyname;
-
- packet_integrity_check(plen, 4, type);
-
- /* Read the remote channel number from the message. */
- remch = packet_get_int();
-
- /*
- * Get a connection to the local authentication agent (this may again
- * get forwarded).
- */
- sock = ssh_get_authentication_socket();
-
- /*
- * If we could not connect the agent, send an error message back to
- * the server. This should never happen unless the agent dies,
- * because authentication forwarding is only enabled if we have an
- * agent.
- */
- if (sock < 0) {
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remch);
- packet_send();
- return;
- }
- debug("Forwarding authentication connection.");
-
- /*
- * Dummy host name. This will be freed when the channel is freed; it
- * will still be valid in the packet_put_string below since the
- * channel cannot yet be freed at that point.
- */
- dummyname = xstrdup("authentication agent connection");
-
- newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname);
- channels[newch].remote_id = remch;
-
- /* Send a confirmation to the remote host. */
- packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
- packet_put_int(remch);
- packet_put_int(newch);
- packet_send();
-}
-
-void
-channel_start_open(int id)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_open: %d: bad id", id);
- return;
- }
- debug("send channel open %d", id);
- packet_start(SSH2_MSG_CHANNEL_OPEN);
- packet_put_cstring(c->ctype);
- packet_put_int(c->self);
- packet_put_int(c->local_window);
- packet_put_int(c->local_maxpacket);
-}
-void
-channel_open(int id)
-{
- /* XXX REMOVE ME */
- channel_start_open(id);
- packet_send();
-}
-void
-channel_request(int id, char *service, int wantconfirm)
-{
- channel_request_start(id, service, wantconfirm);
- packet_send();
- debug("channel request %d: %s", id, service) ;
-}
-void
-channel_request_start(int id, char *service, int wantconfirm)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_request: %d: bad id", id);
- return;
- }
- packet_start(SSH2_MSG_CHANNEL_REQUEST);
- packet_put_int(c->remote_id);
- packet_put_cstring(service);
- packet_put_char(wantconfirm);
-}
-void
-channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_register_callback: %d: bad id", id);
- return;
- }
- c->cb_event = mtype;
- c->cb_fn = fn;
- c->cb_arg = arg;
-}
-void
-channel_register_cleanup(int id, channel_callback_fn *fn)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_register_cleanup: %d: bad id", id);
- return;
- }
- c->dettach_user = fn;
-}
-void
-channel_cancel_cleanup(int id)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_cancel_cleanup: %d: bad id", id);
- return;
- }
- c->dettach_user = NULL;
-}
-void
-channel_register_filter(int id, channel_filter_fn *fn)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL) {
- log("channel_register_filter: %d: bad id", id);
- return;
- }
- c->input_filter = fn;
-}
-
-void
-channel_set_fds(int id, int rfd, int wfd, int efd,
- int extusage, int nonblock)
-{
- Channel *c = channel_lookup(id);
- if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
- fatal("channel_activate for non-larval channel %d.", id);
- channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
- c->type = SSH_CHANNEL_OPEN;
- /* XXX window size? */
- c->local_window = c->local_window_max = c->local_maxpacket * 2;
- packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
- packet_put_int(c->remote_id);
- packet_put_int(c->local_window);
- packet_send();
-}
andersk / openssh.git / blobdiff