* 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 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 1.114 2001/05/08 19:17:30 markus Exp $");
-
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
+RCSID("$OpenBSD: channels.c,v 1.146 2001/12/06 18:20:32 stevesk 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"
-/* 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
*/
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;
-/* lookup channel by id */
+/*
+ * 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
+
+/* Name and directory of socket for authentication agent forwarding. */
+static char *auth_sock_name = NULL;
+static char *auth_sock_dir = NULL;
+
+/* AF_UNSPEC or AF_INET or AF_INET6 */
+static int IPv4or6 = AF_UNSPEC;
+
+/* helper */
+static void port_open_helper(Channel *c, char *rtype);
+
+/* -- channel core */
Channel *
channel_lookup(int id)
* 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)
{
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);
c->cb_fn = NULL;
c->cb_arg = NULL;
c->cb_event = 0;
- c->dettach_user = NULL;
+ c->force_drain = 0;
+ c->detach_user = NULL;
c->input_filter = NULL;
debug("channel %d: new [%s]", found, remote_name);
return c;
}
-
-/* Close all channel fd/socket. */
-
+
+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. */
+
+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);
+
+ 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(Channel *c)
+{
+ char *s;
+ int i, n;
+
+ for (n = 0, i = 0; i < channels_alloc; i++)
+ if (channels[i])
+ n++;
+ debug("channel_free: channel %d: %s, nchannels %d", c->self,
+ c->remote_name ? c->remote_name : "???", n);
+
+ s = channel_open_message();
+ debug3("channel_free: status: %s", s);
+ xfree(s);
+
+ 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);
+ 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()) {
+ 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 > %d",
+ 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) {
+ log("channel_send_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);
+ 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_close_fds(Channel *c)
+channel_register_cleanup(int id, channel_callback_fn *fn)
{
- if (c->sock != -1) {
- close(c->sock);
- c->sock = -1;
- }
- if (c->rfd != -1) {
- close(c->rfd);
- c->rfd = -1;
+ Channel *c = channel_lookup(id);
+ if (c == NULL) {
+ log("channel_register_cleanup: %d: bad id", id);
+ return;
}
- if (c->wfd != -1) {
- close(c->wfd);
- c->wfd = -1;
+ c->detach_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;
}
- if (c->efd != -1) {
- close(c->efd);
- c->efd = -1;
+ c->detach_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;
}
-/* Free the channel and close its fd/socket. */
-
void
-channel_free(Channel *c)
+channel_set_fds(int id, int rfd, int wfd, int efd,
+ int extusage, int nonblock)
{
- char *s;
-
- s = channel_open_message();
- debug("channel_free: channel %d: status: %s", c->self, 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);
- buffer_free(&c->input);
- buffer_free(&c->output);
- buffer_free(&c->extended);
- if (c->remote_name) {
- xfree(c->remote_name);
- c->remote_name = NULL;
- }
- channels[c->self] = NULL;
- xfree(c);
+ 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();
}
/*
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
+static void
channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
{
/* test whether sockets are 'alive' for read/write */
}
}
-void
+static void
channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
{
if (c->istate == CHAN_INPUT_OPEN &&
}
}
-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)
* 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 = (u_char *) 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];
}
/* 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;
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;
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);
+ int ret = x11_open_helper(&c->output);
+
+ /* c->force_drain = 1; */
+
if (ret == 1) {
c->type = SSH_CHANNEL_OPEN;
if (compat20)
}
/* try to decode a socks4 header */
-int
+static int
channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
{
u_char *p, *host;
}
/* 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;
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",
} else {
packet_start(SSH_SMSG_X11_OPEN);
packet_put_int(nc->self);
- if (have_hostname_in_open)
- packet_put_string(buf, strlen(buf));
+ 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;
"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);
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;
+ char *name;
int newsock;
struct sockaddr addr;
socklen_t addrlen;
error("accept from auth socket: %.100s", strerror(errno));
return;
}
+ name = xstrdup("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, name, 1);
if (nc == NULL) {
error("channel_post_auth_listener: channel_new failed");
+ xfree(name);
close(newsock);
}
if (compat20) {
}
}
-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];
} else if (compat13) {
buffer_consume(&c->output, buffer_len(&c->output));
c->type = SSH_CHANNEL_INPUT_DRAINING;
- debug("channel %d: status set to input draining.", c->self);
+ debug("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);
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) {
return -1;
} else if (compat13) {
buffer_consume(&c->output, buffer_len(&c->output));
- debug("channel %d: status set to input draining.", c->self);
+ debug("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;
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
+static void
channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
{
+ if (c->delayed)
+ return;
channel_handle_rfd(c, readset, writeset);
channel_handle_wfd(c, readset, writeset);
}
-void
+static void
channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
{
+ if (c->delayed)
+ return;
channel_handle_rfd(c, readset, writeset);
channel_handle_wfd(c, readset, writeset);
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;
}
}
-void
+static void
channel_handler_init_20(void)
{
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
}
-void
+static void
channel_handler_init_13(void)
{
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
}
-void
+static void
channel_handler_init_15(void)
{
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
}
-void
+static void
channel_handler_init(void)
{
int i;
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;
c = channels[i];
if (c == NULL)
continue;
- if (ftab[c->type] == 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);
- }
+ 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;
for (i = 0; i < channels_alloc; 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;
}
}
-/*
- * 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)
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);
buffer_append(&c->output, data, data_len);
xfree(data);
}
+
void
channel_input_extended_data(int type, int plen, void *ctxt)
{
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 != NULL && 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)
{
if (c == NULL)
packet_disconnect("Received ieof for nonexistent channel %d.", id);
chan_rcvd_ieof(c);
+
+ /* XXX force input close */
+ if (c->force_drain) {
+ debug("channel %d: FORCE input drain", c->self);
+ c->istate = CHAN_INPUT_WAIT_DRAIN;
+ }
+
}
void
}
}
-char *
+static char *
reason2txt(int reason)
{
- switch(reason) {
+ switch (reason) {
case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
return "administratively prohibited";
case SSH2_OPEN_CONNECT_FAILED:
case SSH2_OPEN_RESOURCE_SHORTAGE:
return "resource shortage";
}
- return "unkown reason";
+ return "unknown reason";
}
void
c->remote_window += adjust;
}
-/*
- * Stops listening for channels, and removes any unix domain sockets that we
- * might have.
- */
-
-void
-channel_stop_listening()
-{
- 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:
- 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_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 any channel is still open. */
-
-int
-channel_still_open()
-{
- 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:
- 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()
+channel_input_port_open(int type, int plen, void *ctxt)
{
- int i;
- Channel *c;
+ Channel *c = NULL;
+ u_short host_port;
+ char *host, *originator_string;
+ int remote_id, sock = -1;
- 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:
- 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 */
+ remote_id = packet_get_int();
+ host = packet_get_string(NULL);
+ host_port = packet_get_int();
+
+ 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_done();
+ 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);
+ if (c == NULL) {
+ error("channel_input_port_open: channel_new failed");
+ close(sock);
+ } else {
+ c->remote_id = remote_id;
}
}
- return -1;
+ if (c == NULL) {
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_id);
+ packet_send();
+ }
+ xfree(host);
}
-/*
- * Returns a message describing the currently open forwarded connections,
- * suitable for sending to the client. The message contains crlf pairs for
- * newlines.
- */
+/* -- tcp forwarding */
-char *
-channel_open_message()
+void
+channel_set_af(int af)
{
- 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:
- 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;
+ IPv4or6 = af;
}
/*
int gateway_ports, int remote_fwd)
{
Channel *c;
- int success, sock, on = 1, ctype;
+ int success, sock, on = 1, type;
struct addrinfo hints, *ai, *aitop;
char ntop[NI_MAXHOST], strport[NI_MAXSERV];
const char *host;
if (remote_fwd) {
host = listen_address;
- ctype = SSH_CHANNEL_RPORT_LISTENER;
+ type = SSH_CHANNEL_RPORT_LISTENER;
} else {
host = host_to_connect;
- ctype =SSH_CHANNEL_PORT_LISTENER;
+ type = SSH_CHANNEL_PORT_LISTENER;
}
if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
continue;
}
/* Allocate a channel number for the socket. */
- c = 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);
if (c == NULL) {
* 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;
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)
-{
- Channel *c = NULL;
- u_short host_port;
- char *host, *originator_string;
- int remote_id, sock = -1;
-
- remote_id = 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) {
- c = channel_new("connected socket",
- SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
- originator_string, 1);
- if (c == NULL) {
- error("channel_input_port_open: channel_new failed");
- close(sock);
- } else {
- c->remote_id = remote_id;
- }
- }
- if (c == NULL) {
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_id);
- 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.
*/
-
-#define NUM_SOCKS 10
-
char *
x11_create_display_inet(int screen_number, int x11_display_offset)
{
}
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;
sock = socks[n];
if (listen(sock, 5) < 0) {
error("listen: %.100s", strerror(errno));
- shutdown(sock, SHUT_RDWR);
close(sock);
return NULL;
}
#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[] = {
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 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);
strerror(errno));
return -1;
}
+ if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) == -1)
+ error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
return sock;
}
debug("Received X11 open request.");
remote_id = packet_get_int();
- if (have_hostname_in_open) {
+
+ 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)");
close(sock);
} else {
c->remote_id = remote_id;
+ c->force_drain = 1;
}
}
if (c == NULL) {
deny_input_open(int type, int plen, void *ctxt)
{
int rchan = packet_get_int();
- switch(type){
+ switch (type) {
case SSH_SMSG_AGENT_OPEN:
error("Warning: ssh server tried agent forwarding.");
break;
/*
* 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();
*/
char *
-auth_get_socket_name()
+auth_get_socket_name(void)
{
- return channel_forwarded_auth_socket_name;
+ return auth_sock_name;
}
/* removes the agent forwarding socket */
void
-cleanup_socket(void)
+auth_sock_cleanup_proc(void *_pw)
{
- unlink(channel_forwarded_auth_socket_name);
- rmdir(channel_forwarded_auth_socket_dir);
+ 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();
+ }
}
/*
int sock;
struct sockaddr_un sunaddr;
- if (auth_get_socket_name() != NULL)
- fatal("Protocol error: authentication forwarding requested twice.");
+ if (auth_get_socket_name() != NULL) {
+ error("authentication forwarding requested twice.");
+ return 0;
+ }
/* 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);
+ auth_sock_name = xmalloc(MAXPATHLEN);
+ auth_sock_dir = xmalloc(MAXPATHLEN);
+ strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
/* Create private directory for socket */
- if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
- packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
- strerror(errno));
+ if (mkdtemp(auth_sock_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;
+ xfree(auth_sock_name);
+ xfree(auth_sock_dir);
+ auth_sock_name = NULL;
+ auth_sock_dir = NULL;
return 0;
}
- snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
- channel_forwarded_auth_socket_dir, (int) getpid());
+ snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
+ auth_sock_dir, (int) getpid());
+
+ /* delete agent socket on fatal() */
+ fatal_add_cleanup(auth_sock_cleanup_proc, pw);
- 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)
/* 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));
+ 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(pw);
+ fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
close(sock);
return 0;
}
- strlcpy(nc->path, channel_forwarded_auth_socket_name, sizeof(nc->path));
+ strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
return 1;
}
{
Channel *c = NULL;
int remote_id, sock;
- char *dummyname;
+ char *name;
packet_integrity_check(plen, 4, type);
* agent.
*/
if (sock >= 0) {
- dummyname = xstrdup("authentication agent connection");
- c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, -1, 0, 0, 0, dummyname, 1);
+ name = xstrdup("authentication agent connection");
+ c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
+ -1, 0, 0, 0, name, 1);
if (c == NULL) {
error("auth_input_open_request: channel_new failed");
+ xfree(name);
close(sock);
} else {
c->remote_id = remote_id;
+ c->force_drain = 1;
}
}
if (c == NULL) {
}
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