summaryrefslogtreecommitdiff
path: root/channels.c
diff options
context:
space:
mode:
authorDamien Miller <djm@mindrot.org>1999-11-25 00:26:21 +1100
committerDamien Miller <djm@mindrot.org>1999-11-25 00:26:21 +1100
commit95def09838fc61b37b6ea7cd5c234a465b4b129b (patch)
tree042744f76f40a326b873cb1c3690a6d7d966bc3e /channels.c
parent4d2f15f895f4c795afc008aeff3fd2ceffbc44f4 (diff)
- Merged very large OpenBSD source code reformat
- OpenBSD CVS updates - [channels.c cipher.c compat.c log-client.c scp.c serverloop.c] [ssh.h sshd.8 sshd.c] syslog changes: * Unified Logmessage for all auth-types, for success and for failed * Standard connections get only ONE line in the LOG when level==LOG: Auth-attempts are logged only, if authentication is: a) successfull or b) with passwd or c) we had more than AUTH_FAIL_LOG failues * many log() became verbose() * old behaviour with level=VERBOSE - [readconf.c readconf.h ssh.1 ssh.h sshconnect.c sshd.c] tranfer s/key challenge/response data in SSH_SMSG_AUTH_TIS_CHALLENGE messages. allows use of s/key in windows (ttssh, securecrt) and ssh-1.2.27 clients without 'ssh -v', ok: niels@ - [sshd.8] -V, for fallback to openssh in SSH2 compatibility mode - [sshd.c] fix sigchld race; cjc5@po.cwru.edu
Diffstat (limited to 'channels.c')
-rw-r--r--channels.c2427
1 files changed, 1187 insertions, 1240 deletions
diff --git a/channels.c b/channels.c
index 3e3b5f36..0a37d1ab 100644
--- a/channels.c
+++ b/channels.c
@@ -1,22 +1,22 @@
/*
-
-channels.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Fri Mar 24 16:35:24 1995 ylo
-
-This file contains functions for generic socket connection forwarding.
-There is also code for initiating connection forwarding for X11 connections,
-arbitrary tcp/ip connections, and the authentication agent connection.
-
-*/
+ *
+ * channels.c
+ *
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ *
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * Created: Fri Mar 24 16:35:24 1995 ylo
+ *
+ * This file contains functions for generic socket connection forwarding.
+ * There is also code for initiating connection forwarding for X11 connections,
+ * arbitrary tcp/ip connections, and the authentication agent connection.
+ *
+ */
#include "includes.h"
-RCSID("$Id: channels.c,v 1.6 1999/11/21 02:23:53 damien Exp $");
+RCSID("$Id: channels.c,v 1.7 1999/11/24 13:26:22 damien Exp $");
#include "ssh.h"
#include "packet.h"
@@ -52,7 +52,7 @@ static int channel_max_fd_value = 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;
+static char *channel_forwarded_auth_socket_dir = NULL;
/* Saved X11 authentication protocol name. */
char *x11_saved_proto = NULL;
@@ -70,10 +70,9 @@ unsigned int x11_fake_data_len;
The local sides of any remote forwards are stored in this array to prevent
a corrupt remote server from accessing arbitrary TCP/IP ports on our
local network (which might be behind a firewall). */
-typedef struct
-{
- char *host; /* Host name. */
- int port; /* Port number. */
+typedef struct {
+ char *host; /* Host name. */
+ int port; /* Port number. */
} ForwardPermission;
/* List of all permitted host/port pairs to connect. */
@@ -90,1056 +89,1015 @@ static int have_hostname_in_open = 0;
/* Sets specific protocol options. */
-void channel_set_options(int hostname_in_open)
+void
+channel_set_options(int hostname_in_open)
{
- have_hostname_in_open = hostname_in_open;
+ have_hostname_in_open = hostname_in_open;
}
/* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
called by the server, because the user could connect to any port anyway,
and the server has no way to know but to trust the client anyway. */
-void channel_permit_all_opens()
+void
+channel_permit_all_opens()
{
- all_opens_permitted = 1;
+ all_opens_permitted = 1;
}
-/* Allocate a new channel object and set its type and socket.
+/* Allocate a new channel object and set its type and socket.
This will cause remote_name to be freed. */
-int channel_allocate(int type, int sock, char *remote_name)
+int
+channel_allocate(int type, int sock, char *remote_name)
{
- int i, found;
- Channel *c;
-
- /* Update the maximum file descriptor value. */
- if (sock > channel_max_fd_value)
- channel_max_fd_value = sock;
-
- /* Do initial allocation if this is the first call. */
- if (channels_alloc == 0)
- {
- channels_alloc = 10;
- 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);
- }
-
- /* 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)
- {
- /* 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;
- channels_alloc += 10;
- debug("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;
- }
-
- /* Initialize and return new channel number. */
- c=&channels[found];
- buffer_init(&c->input);
- buffer_init(&c->output);
- chan_init_iostates(c);
- c->self = found;
- c->type = type;
- c->sock = sock;
- c->remote_id = -1;
- c->remote_name = remote_name;
- debug("channel %d: new [%s]", found, remote_name);
- return found;
+ int i, found;
+ Channel *c;
+
+ /* Update the maximum file descriptor value. */
+ if (sock > channel_max_fd_value)
+ channel_max_fd_value = sock;
+
+ /* Do initial allocation if this is the first call. */
+ if (channels_alloc == 0) {
+ channels_alloc = 10;
+ 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);
+ }
+ /* 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) {
+ /* 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;
+ channels_alloc += 10;
+ debug("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;
+ }
+ /* Initialize and return new channel number. */
+ c = &channels[found];
+ buffer_init(&c->input);
+ buffer_init(&c->output);
+ chan_init_iostates(c);
+ c->self = found;
+ c->type = type;
+ c->sock = sock;
+ c->remote_id = -1;
+ c->remote_name = remote_name;
+ debug("channel %d: new [%s]", found, remote_name);
+ return found;
}
/* Free the channel and close its socket. */
-void channel_free(int channel)
+void
+channel_free(int channel)
{
- if (channel < 0 || channel >= channels_alloc ||
- channels[channel].type == SSH_CHANNEL_FREE)
- packet_disconnect("channel free: bad local channel %d", channel);
-
- if(compat13)
- shutdown(channels[channel].sock, SHUT_RDWR);
- close(channels[channel].sock);
- buffer_free(&channels[channel].input);
- buffer_free(&channels[channel].output);
- channels[channel].type = SSH_CHANNEL_FREE;
- if (channels[channel].remote_name)
- {
- xfree(channels[channel].remote_name);
- channels[channel].remote_name = NULL;
- }
+ if (channel < 0 || channel >= channels_alloc ||
+ channels[channel].type == SSH_CHANNEL_FREE)
+ packet_disconnect("channel free: bad local channel %d", channel);
+
+ if (compat13)
+ shutdown(channels[channel].sock, SHUT_RDWR);
+ close(channels[channel].sock);
+ buffer_free(&channels[channel].input);
+ buffer_free(&channels[channel].output);
+ channels[channel].type = SSH_CHANNEL_FREE;
+ if (channels[channel].remote_name) {
+ xfree(channels[channel].remote_name);
+ channels[channel].remote_name = NULL;
+ }
}
/* This is called just before select() to add any bits relevant to
channels in the select bitmasks. */
-void channel_prepare_select(fd_set *readset, fd_set *writeset)
+void
+channel_prepare_select(fd_set * readset, fd_set * writeset)
{
- int i;
- Channel *ch;
- unsigned char *ucp;
- unsigned int proto_len, data_len;
-
- for (i = 0; i < channels_alloc; i++)
- {
- ch = &channels[i];
- redo:
- switch (ch->type)
- {
- case SSH_CHANNEL_X11_LISTENER:
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_AUTH_SOCKET:
- FD_SET(ch->sock, readset);
- break;
-
- case SSH_CHANNEL_OPEN:
- if(compat13){
- if (buffer_len(&ch->input) < packet_get_maxsize())
- FD_SET(ch->sock, readset);
- if (buffer_len(&ch->output) > 0)
- FD_SET(ch->sock, writeset);
- break;
- }
- /* test whether sockets are 'alive' for read/write */
- if (ch->istate == CHAN_INPUT_OPEN)
- if (buffer_len(&ch->input) < packet_get_maxsize())
- FD_SET(ch->sock, readset);
- if (ch->ostate == CHAN_OUTPUT_OPEN || ch->ostate == CHAN_OUTPUT_WAIT_DRAIN){
- if (buffer_len(&ch->output) > 0){
- FD_SET(ch->sock, writeset);
- }else if(ch->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
- chan_obuf_empty(ch);
- }
- }
- break;
-
- case SSH_CHANNEL_INPUT_DRAINING:
- if (!compat13)
- fatal("cannot happen: IN_DRAIN");
- if (buffer_len(&ch->input) == 0)
- {
- packet_start(SSH_MSG_CHANNEL_CLOSE);
- packet_put_int(ch->remote_id);
- packet_send();
- ch->type = SSH_CHANNEL_CLOSED;
- debug("Closing channel %d after input drain.", i);
- break;
- }
- break;
-
- case SSH_CHANNEL_OUTPUT_DRAINING:
- if (!compat13)
- fatal("cannot happen: OUT_DRAIN");
- if (buffer_len(&ch->output) == 0)
- {
- /* debug("Freeing channel %d after output drain.", i); */
- channel_free(i);
- break;
- }
- FD_SET(ch->sock, writeset);
- break;
-
- case SSH_CHANNEL_X11_OPEN:
- /* This is a special state for X11 authentication spoofing. An
- opened X11 connection (when authentication spoofing is being
- done) remains in this state until the first packet has been
- completely read. The authentication 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. */
-
- /* Check if the fixed size part of the packet is in buffer. */
- if (buffer_len(&ch->output) < 12)
- break;
-
- /* Parse the lengths of variable-length fields. */
- ucp = (unsigned char *)buffer_ptr(&ch->output);
- if (ucp[0] == 0x42)
- { /* Byte order MSB first. */
- proto_len = 256 * ucp[6] + ucp[7];
- data_len = 256 * ucp[8] + ucp[9];
- }
- else
- if (ucp[0] == 0x6c)
- { /* Byte order LSB first. */
- 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]);
- ch->type = SSH_CHANNEL_OPEN;
- goto reject;
- }
-
- /* Check if the whole packet is in buffer. */
- if (buffer_len(&ch->output) <
- 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
- break;
-
- /* 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.");
- ch->type = SSH_CHANNEL_OPEN;
- goto reject;
- }
-
- /* 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.");
- ch->type = SSH_CHANNEL_OPEN;
- goto reject;
- }
-
- /* Check fake data length */
- if (x11_fake_data_len != x11_saved_data_len)
- {
- error("X11 fake_data_len %d != saved_data_len %d",
- x11_fake_data_len, x11_saved_data_len);
- ch->type = SSH_CHANNEL_OPEN;
- goto reject;
- }
-
- /* Received authentication protocol and data match our fake data.
- Substitute the fake data with real data. */
- memcpy(ucp + 12 + ((proto_len + 3) & ~3),
- x11_saved_data, x11_saved_data_len);
-
- /* Start normal processing for the channel. */
- ch->type = SSH_CHANNEL_OPEN;
- goto redo;
-
+ int i;
+ Channel *ch;
+ unsigned char *ucp;
+ unsigned int proto_len, data_len;
+
+ for (i = 0; i < channels_alloc; i++) {
+ ch = &channels[i];
+redo:
+ switch (ch->type) {
+ case SSH_CHANNEL_X11_LISTENER:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ FD_SET(ch->sock, readset);
+ break;
+
+ case SSH_CHANNEL_OPEN:
+ if (compat13) {
+ if (buffer_len(&ch->input) < packet_get_maxsize())
+ FD_SET(ch->sock, readset);
+ if (buffer_len(&ch->output) > 0)
+ FD_SET(ch->sock, writeset);
+ break;
+ }
+ /* test whether sockets are 'alive' for read/write */
+ if (ch->istate == CHAN_INPUT_OPEN)
+ if (buffer_len(&ch->input) < packet_get_maxsize())
+ FD_SET(ch->sock, readset);
+ if (ch->ostate == CHAN_OUTPUT_OPEN ||
+ ch->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+ if (buffer_len(&ch->output) > 0) {
+ FD_SET(ch->sock, writeset);
+ } else if (ch->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+ chan_obuf_empty(ch);
+ }
+ }
+ break;
+
+ case SSH_CHANNEL_INPUT_DRAINING:
+ if (!compat13)
+ fatal("cannot happen: IN_DRAIN");
+ if (buffer_len(&ch->input) == 0) {
+ packet_start(SSH_MSG_CHANNEL_CLOSE);
+ packet_put_int(ch->remote_id);
+ packet_send();
+ ch->type = SSH_CHANNEL_CLOSED;
+ debug("Closing channel %d after input drain.", i);
+ break;
+ }
+ break;
+
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ if (!compat13)
+ fatal("cannot happen: OUT_DRAIN");
+ if (buffer_len(&ch->output) == 0) {
+ channel_free(i);
+ break;
+ }
+ FD_SET(ch->sock, writeset);
+ break;
+
+ case SSH_CHANNEL_X11_OPEN:
+ /* This is a special state for X11 authentication
+ spoofing. An opened X11 connection (when
+ authentication spoofing is being done) remains
+ in this state until the first packet has been
+ completely read. The authentication 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. */
+
+ /* Check if the fixed size part of the packet is in buffer. */
+ if (buffer_len(&ch->output) < 12)
+ break;
+
+ /* Parse the lengths of variable-length fields. */
+ ucp = (unsigned char *) buffer_ptr(&ch->output);
+ if (ucp[0] == 0x42) { /* Byte order MSB first. */
+ proto_len = 256 * ucp[6] + ucp[7];
+ data_len = 256 * ucp[8] + ucp[9];
+ } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
+ 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]);
+ ch->type = SSH_CHANNEL_OPEN;
+ goto reject;
+ }
+
+ /* Check if the whole packet is in buffer. */
+ if (buffer_len(&ch->output) <
+ 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
+ break;
+
+ /* 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.");
+ ch->type = SSH_CHANNEL_OPEN;
+ goto reject;
+ }
+ /* 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.");
+ ch->type = SSH_CHANNEL_OPEN;
+ goto reject;
+ }
+ /* Check fake data length */
+ if (x11_fake_data_len != x11_saved_data_len) {
+ error("X11 fake_data_len %d != saved_data_len %d",
+ x11_fake_data_len, x11_saved_data_len);
+ ch->type = SSH_CHANNEL_OPEN;
+ goto reject;
+ }
+ /* Received authentication protocol and data match
+ our fake data. Substitute the fake data with
+ real data. */
+ memcpy(ucp + 12 + ((proto_len + 3) & ~3),
+ x11_saved_data, x11_saved_data_len);
+
+ /* Start normal processing for the channel. */
+ ch->type = SSH_CHANNEL_OPEN;
+ goto redo;
+
reject:
- /* We have received an X11 connection that has bad authentication
- information. */
- log("X11 connection rejected because of wrong authentication.\r\n");
- buffer_clear(&ch->input);
- buffer_clear(&ch->output);
- if (compat13) {
- close(ch->sock);
- ch->sock = -1;
- ch->type = SSH_CHANNEL_CLOSED;
- packet_start(SSH_MSG_CHANNEL_CLOSE);
- packet_put_int(ch->remote_id);
- packet_send();
- }else{
- debug("X11 rejected %d i%d/o%d", ch->self, ch->istate, ch->ostate);
- chan_read_failed(ch);
- chan_write_failed(ch);
- debug("X11 rejected %d i%d/o%d", ch->self, ch->istate, ch->ostate);
- }
- break;
-
- case SSH_CHANNEL_FREE:
- default:
- continue;
+ /* We have received an X11 connection that has bad
+ authentication information. */
+ log("X11 connection rejected because of wrong authentication.\r\n");
+ buffer_clear(&ch->input);
+ buffer_clear(&ch->output);
+ if (compat13) {
+ close(ch->sock);
+ ch->sock = -1;
+ ch->type = SSH_CHANNEL_CLOSED;
+ packet_start(SSH_MSG_CHANNEL_CLOSE);
+ packet_put_int(ch->remote_id);
+ packet_send();
+ } else {
+ debug("X11 rejected %d i%d/o%d", ch->self, ch->istate, ch->ostate);
+ chan_read_failed(ch);
+ chan_write_failed(ch);
+ debug("X11 rejected %d i%d/o%d", ch->self, ch->istate, ch->ostate);
+ }
+ break;
+
+ case SSH_CHANNEL_FREE:
+ default:
+ continue;
+ }
}
- }
}
/* After select, perform any appropriate operations for channels which
have events pending. */
-void channel_after_select(fd_set *readset, fd_set *writeset)
+void
+channel_after_select(fd_set * readset, fd_set * writeset)
{
- struct sockaddr addr;
- int addrlen, newsock, i, newch, len;
- Channel *ch;
- char buf[16384], *remote_hostname;
-
- /* Loop over all channels... */
- for (i = 0; i < channels_alloc; i++)
- {
- ch = &channels[i];
- switch (ch->type)
- {
- case SSH_CHANNEL_X11_LISTENER:
- /* This is our fake X11 server socket. */
- if (FD_ISSET(ch->sock, readset))
- {
- debug("X11 connection requested.");
- addrlen = sizeof(addr);
- newsock = accept(ch->sock, &addr, &addrlen);
- if (newsock < 0)
- {
- error("accept: %.100s", strerror(errno));
- break;
- }
- remote_hostname = get_remote_hostname(newsock);
- snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
- remote_hostname, get_peer_port(newsock));
- xfree(remote_hostname);
- newch = channel_allocate(SSH_CHANNEL_OPENING, newsock,
- xstrdup(buf));
- packet_start(SSH_SMSG_X11_OPEN);
- packet_put_int(newch);
- if (have_hostname_in_open)
- packet_put_string(buf, strlen(buf));
- packet_send();
- }
- break;
-
- case SSH_CHANNEL_PORT_LISTENER:
- /* This socket is listening for connections to a forwarded TCP/IP
- port. */
- if (FD_ISSET(ch->sock, readset))
- {
- debug("Connection to port %d forwarding to %.100s:%d requested.",
- ch->listening_port, ch->path, ch->host_port);
- addrlen = sizeof(addr);
- newsock = accept(ch->sock, &addr, &addrlen);
- if (newsock < 0)
- {
- error("accept: %.100s", strerror(errno));
- break;
- }
- remote_hostname = get_remote_hostname(newsock);
- snprintf(buf, sizeof buf, "listen port %d:%.100s:%d, connect from %.200s:%d",
- ch->listening_port, ch->path, ch->host_port,
- remote_hostname, get_peer_port(newsock));
- xfree(remote_hostname);
- newch = channel_allocate(SSH_CHANNEL_OPENING, newsock,
- xstrdup(buf));
- packet_start(SSH_MSG_PORT_OPEN);
- packet_put_int(newch);
- packet_put_string(ch->path, strlen(ch->path));
- packet_put_int(ch->host_port);
- if (have_hostname_in_open)
- packet_put_string(buf, strlen(buf));
- packet_send();
- }
- break;
-
- case SSH_CHANNEL_AUTH_SOCKET:
- /* This is the authentication agent socket listening for connections
- from clients. */
- if (FD_ISSET(ch->sock, readset))
- {
- int nchan;
- len = sizeof(addr);
- newsock = accept(ch->sock, &addr, &len);
- if (newsock < 0)
- {
- error("accept from auth socket: %.100s", strerror(errno));
- break;
+ struct sockaddr addr;
+ int addrlen, newsock, i, newch, len;
+ Channel *ch;
+ char buf[16384], *remote_hostname;
+
+ /* Loop over all channels... */
+ for (i = 0; i < channels_alloc; i++) {
+ ch = &channels[i];
+ switch (ch->type) {
+ case SSH_CHANNEL_X11_LISTENER:
+ /* This is our fake X11 server socket. */
+ if (FD_ISSET(ch->sock, readset)) {
+ debug("X11 connection requested.");
+ addrlen = sizeof(addr);
+ newsock = accept(ch->sock, &addr, &addrlen);
+ if (newsock < 0) {
+ error("accept: %.100s", strerror(errno));
+ break;
+ }
+ remote_hostname = get_remote_hostname(newsock);
+ snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
+ remote_hostname, get_peer_port(newsock));
+ xfree(remote_hostname);
+ newch = channel_allocate(SSH_CHANNEL_OPENING, newsock,
+ xstrdup(buf));
+ packet_start(SSH_SMSG_X11_OPEN);
+ packet_put_int(newch);
+ if (have_hostname_in_open)
+ packet_put_string(buf, strlen(buf));
+ packet_send();
+ }
+ break;
+
+ case SSH_CHANNEL_PORT_LISTENER:
+ /* This socket is listening for connections to a
+ forwarded TCP/IP port. */
+ if (FD_ISSET(ch->sock, readset)) {
+ debug("Connection to port %d forwarding to %.100s:%d requested.",
+ ch->listening_port, ch->path, ch->host_port);
+ addrlen = sizeof(addr);
+ newsock = accept(ch->sock, &addr, &addrlen);
+ if (newsock < 0) {
+ error("accept: %.100s", strerror(errno));
+ break;
+ }
+ remote_hostname = get_remote_hostname(newsock);
+ snprintf(buf, sizeof buf, "listen port %d:%.100s:%d, connect from %.200s:%d",
+ ch->listening_port, ch->path, ch->host_port,
+ remote_hostname, get_peer_port(newsock));
+ xfree(remote_hostname);
+ newch = channel_allocate(SSH_CHANNEL_OPENING, newsock,
+ xstrdup(buf));
+ packet_start(SSH_MSG_PORT_OPEN);
+ packet_put_int(newch);
+ packet_put_string(ch->path, strlen(ch->path));
+ packet_put_int(ch->host_port);
+ if (have_hostname_in_open)
+ packet_put_string(buf, strlen(buf));
+ packet_send();
+ }
+ break;
+
+ case SSH_CHANNEL_AUTH_SOCKET:
+ /* This is the authentication agent socket
+ listening for connections from clients. */
+ if (FD_ISSET(ch->sock, readset)) {
+ int nchan;
+ len = sizeof(addr);
+ newsock = accept(ch->sock, &addr, &len);
+ if (newsock < 0) {
+ error("accept from auth socket: %.100s", strerror(errno));
+ break;
+ }
+ nchan = channel_allocate(SSH_CHANNEL_OPENING, newsock,
+ xstrdup("accepted auth socket"));
+ packet_start(SSH_SMSG_AGENT_OPEN);
+ packet_put_int(nchan);
+ packet_send();
+ }
+ break;
+
+ case SSH_CHANNEL_OPEN:
+ /* This is an open two-way communication channel.
+ It is not of interest to us at this point what
+ kind of data is being transmitted. */
+
+ /* Read available incoming data and append it to
+ buffer; shutdown socket, if read or write
+ failes */
+ if (FD_ISSET(ch->sock, readset)) {
+ len = read(ch->sock, buf, sizeof(buf));
+ if (len <= 0) {
+ if (compat13) {
+ buffer_consume(&ch->output, buffer_len(&ch->output));
+ ch->type = SSH_CHANNEL_INPUT_DRAINING;
+ debug("Channel %d status set to input draining.", i);
+ } else {
+ chan_read_failed(ch);
+ }
+ break;
+ }
+ buffer_append(&ch->input, buf, len);
+ }
+ /* Send buffered output data to the socket. */
+ if (FD_ISSET(ch->sock, writeset) && buffer_len(&ch->output) > 0) {
+ len = write(ch->sock, buffer_ptr(&ch->output),
+ buffer_len(&ch->output));
+ if (len <= 0) {
+ if (compat13) {
+ buffer_consume(&ch->output, buffer_len(&ch->output));
+ debug("Channel %d status set to input draining.", i);
+ ch->type = SSH_CHANNEL_INPUT_DRAINING;
+ } else {
+ chan_write_failed(ch);
+ }
+ break;
+ }
+ buffer_consume(&ch->output, len);
+ }
+ break;
+
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ if (!compat13)
+ fatal("cannot happen: OUT_DRAIN");
+ /* Send buffered output data to the socket. */
+ if (FD_ISSET(ch->sock, writeset) && buffer_len(&ch->output) > 0) {
+ len = write(ch->sock, buffer_ptr(&ch->output),
+ buffer_len(&ch->output));
+ if (len <= 0)
+ buffer_consume(&ch->output, buffer_len(&ch->output));
+ else
+ buffer_consume(&ch->output, len);
+ }
+ break;
+
+ case SSH_CHANNEL_X11_OPEN:
+ case SSH_CHANNEL_FREE:
+ default:
+ continue;
}
-
- nchan = channel_allocate(SSH_CHANNEL_OPENING, newsock,
- xstrdup("accepted auth socket"));
- packet_start(SSH_SMSG_AGENT_OPEN);
- packet_put_int(nchan);
- packet_send();
- }
- break;
-
- case SSH_CHANNEL_OPEN:
- /* This is an open two-way communication channel. It is not of
- interest to us at this point what kind of data is being
- transmitted. */
-
- /* Read available incoming data and append it to buffer;
- shutdown socket, if read or write failes */
- if (FD_ISSET(ch->sock, readset))
- {
- len = read(ch->sock, buf, sizeof(buf));
- if (len <= 0)
- {
- if (compat13) {
- buffer_consume(&ch->output, buffer_len(&ch->output));
- ch->type = SSH_CHANNEL_INPUT_DRAINING;
- debug("Channel %d status set to input draining.", i);
- }else{
- chan_read_failed(ch);
- }
- break;
- }
- buffer_append(&ch->input, buf, len);
- }
- /* Send buffered output data to the socket. */
- if (FD_ISSET(ch->sock, writeset) && buffer_len(&ch->output) > 0)
- {
- len = write(ch->sock, buffer_ptr(&ch->output),
- buffer_len(&ch->output));
- if (len <= 0)
- {
- if (compat13) {
- buffer_consume(&ch->output, buffer_len(&ch->output));
- debug("Channel %d status set to input draining.", i);
- ch->type = SSH_CHANNEL_INPUT_DRAINING;
- }else{
- chan_write_failed(ch);
- }
- break;
- }
- buffer_consume(&ch->output, len);
- }
- break;
-
- case SSH_CHANNEL_OUTPUT_DRAINING:
- if (!compat13)
- fatal("cannot happen: OUT_DRAIN");
- /* Send buffered output data to the socket. */
- if (FD_ISSET(ch->sock, writeset) && buffer_len(&ch->output) > 0)
- {
- len = write(ch->sock, buffer_ptr(&ch->output),
- buffer_len(&ch->output));
- if (len <= 0)
- buffer_consume(&ch->output, buffer_len(&ch->output));
- else
- buffer_consume(&ch->output, len);
- }
- break;
-
- case SSH_CHANNEL_X11_OPEN:
- case SSH_CHANNEL_FREE:
- default:
- continue;
}
- }
}
/* If there is data to send to the connection, send some of it now. */
-void channel_output_poll()
+void
+channel_output_poll()
{
- int len, i;
- Channel *ch;
-
- for (i = 0; i < channels_alloc; i++)
- {
- ch = &channels[i];
- /* We are only interested in channels that can have buffered incoming
- data. */
- if (ch->type != SSH_CHANNEL_OPEN &&
- ch->type != SSH_CHANNEL_INPUT_DRAINING)
- continue;
-
- /* Get the amount of buffered data for this channel. */
- len = buffer_len(&ch->input);
- if (len > 0)
- {
- /* Send some data for the other side over the secure connection. */
- if (packet_is_interactive())
- {
- if (len > 1024)
- len = 512;
- }
- else
- {
- if (len > 16384)
- len = 16384; /* Keep the packets at reasonable size. */
- }
- packet_start(SSH_MSG_CHANNEL_DATA);
- packet_put_int(ch->remote_id);
- packet_put_string(buffer_ptr(&ch->input), len);
- packet_send();
- buffer_consume(&ch->input, len);
+ int len, i;
+ Channel *ch;
+
+ for (i = 0; i < channels_alloc; i++) {
+ ch = &channels[i];
+ /* We are only interested in channels that can have
+ buffered incoming data. */
+ if (ch->type != SSH_CHANNEL_OPEN &&
+ ch->type != SSH_CHANNEL_INPUT_DRAINING)
+ continue;
+
+ /* Get the amount of buffered data for this channel. */
+ len = buffer_len(&ch->input);
+ if (len > 0) {
+ /* Send some data for the other side over the
+ secure connection. */
+ if (packet_is_interactive()) {
+ if (len > 1024)
+ len = 512;
+ } else {
+ /* Keep the packets at reasonable size. */
+ if (len > 16384)
+ len = 16384;
+ }
+ packet_start(SSH_MSG_CHANNEL_DATA);
+ packet_put_int(ch->remote_id);
+ packet_put_string(buffer_ptr(&ch->input), len);
+ packet_send();
+ buffer_consume(&ch->input, len);
+ } else if (ch->istate == CHAN_INPUT_WAIT_DRAIN) {
+ if (compat13)
+ 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 */
+ chan_ibuf_empty(ch);
+ }
}
- else if(ch->istate == CHAN_INPUT_WAIT_DRAIN)
- {
- if (compat13)
- 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 */
- chan_ibuf_empty(ch);
- }
- }
}
/* 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. */
-void channel_input_data(int payload_len)
+void
+channel_input_data(int payload_len)
{
- int channel;
- char *data;
- unsigned int data_len;
-
- /* Get the channel number and verify it. */
- channel = packet_get_int();
- if (channel < 0 || channel >= channels_alloc ||
- channels[channel].type == SSH_CHANNEL_FREE)
- packet_disconnect("Received data for nonexistent channel %d.", channel);
-
- /* Ignore any data for non-open channels (might happen on close) */
- if (channels[channel].type != SSH_CHANNEL_OPEN &&
- channels[channel].type != SSH_CHANNEL_X11_OPEN)
- return;
-
- /* Get the data. */
- data = packet_get_string(&data_len);
- packet_integrity_check(payload_len, 4 + 4+data_len, SSH_MSG_CHANNEL_DATA);
- buffer_append(&channels[channel].output, data, data_len);
- xfree(data);
+ int channel;
+ char *data;
+ unsigned int data_len;
+
+ /* Get the channel number and verify it. */
+ channel = packet_get_int();
+ if (channel < 0 || channel >= channels_alloc ||
+ channels[channel].type == SSH_CHANNEL_FREE)
+ packet_disconnect("Received data for nonexistent channel %d.", channel);
+
+ /* Ignore any data for non-open channels (might happen on close) */
+ if (channels[channel].type != SSH_CHANNEL_OPEN &&
+ channels[channel].type != SSH_CHANNEL_X11_OPEN)
+ return;
+
+ /* Get the data. */
+ data = packet_get_string(&data_len);
+ packet_integrity_check(payload_len, 4 + 4 + data_len, SSH_MSG_CHANNEL_DATA);
+ buffer_append(&channels[channel].output, data, data_len);
+ 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()
+int
+channel_not_very_much_buffered_data()
{
- unsigned int i;
- Channel *ch;
-
- for (i = 0; i < channels_alloc; i++)
- {
- ch = &channels[i];
- switch (ch->type)
- {
- case SSH_CHANNEL_X11_LISTENER:
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_AUTH_SOCKET:
- continue;
- case SSH_CHANNEL_OPEN:
- if (buffer_len(&ch->input) > packet_get_maxsize())
- return 0;
- if (buffer_len(&ch->output) > packet_get_maxsize())
- return 0;
- continue;
- case SSH_CHANNEL_INPUT_DRAINING:
- case SSH_CHANNEL_OUTPUT_DRAINING:
- case SSH_CHANNEL_X11_OPEN:
- case SSH_CHANNEL_FREE:
- default:
- continue;
+ unsigned int i;
+ Channel *ch;
+
+ for (i = 0; i < channels_alloc; i++) {
+ ch = &channels[i];
+ switch (ch->type) {
+ case SSH_CHANNEL_X11_LISTENER:
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ continue;
+ case SSH_CHANNEL_OPEN:
+ if (buffer_len(&ch->input) > packet_get_maxsize())
+ return 0;
+ if (buffer_len(&ch->output) > packet_get_maxsize())
+ return 0;
+ continue;
+ case SSH_CHANNEL_INPUT_DRAINING:
+ case SSH_CHANNEL_OUTPUT_DRAINING:
+ case SSH_CHANNEL_X11_OPEN:
+ case SSH_CHANNEL_FREE:
+ default:
+ continue;
+ }
}
- }
- return 1;
+ return 1;
}
/* This is called after receiving CHANNEL_CLOSE/IEOF. */
-void channel_input_close()
+void
+channel_input_close()
{
- int channel;
-
- /* Get the channel number and verify it. */
- channel = packet_get_int();
- if (channel < 0 || channel >= channels_alloc ||
- channels[channel].type == SSH_CHANNEL_FREE)
- packet_disconnect("Received data for nonexistent channel %d.", channel);
-
- if(!compat13){
- /* proto version 1.5 overloads CLOSE with IEOF */
- chan_rcvd_ieof(&channels[channel]);
- return;
- }
-
- /* Send a confirmation that we have closed the channel and no more data is
- coming for it. */
- packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
- packet_put_int(channels[channel].remote_id);
- packet_send();
-
- /* If the channel is in closed state, we have sent a close request, and
- the other side will eventually respond with a confirmation. Thus,
- we cannot free the channel here, because then there would be no-one to
- receive the confirmation. The channel gets freed when the confirmation
- arrives. */
- if (channels[channel].type != SSH_CHANNEL_CLOSED)
- {
- /* Not a closed channel - mark it as draining, which will cause it to
- be freed later. */
- buffer_consume(&channels[channel].input,
- buffer_len(&channels[channel].input));
- channels[channel].type = SSH_CHANNEL_OUTPUT_DRAINING;
- /* debug("Setting status to output draining; output len = %d",
- buffer_len(&channels[channel].output)); */
- }
+ int channel;
+
+ /* Get the channel number and verify it. */
+ channel = packet_get_int();
+ if (channel < 0 || channel >= channels_alloc ||
+ channels[channel].type == SSH_CHANNEL_FREE)
+ packet_disconnect("Received data for nonexistent channel %d.", channel);
+
+ if (!compat13) {
+ /* proto version 1.5 overloads CLOSE with IEOF */
+ chan_rcvd_ieof(&channels[channel]);
+ return;
+ }
+ /* Send a confirmation that we have closed the channel and no more
+ data is coming for it. */
+ packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
+ packet_put_int(channels[channel].remote_id);
+ packet_send();
+
+ /* If the channel is in closed state, we have sent a close
+ request, and the other side will eventually respond with a
+ confirmation. Thus, we cannot free the channel here, because
+ then there would be no-one to receive the confirmation. The
+ channel gets freed when the confirmation arrives. */
+ if (channels[channel].type != SSH_CHANNEL_CLOSED) {
+ /* Not a closed channel - mark it as draining, which will
+ cause it to be freed later. */
+ buffer_consume(&channels[channel].input,
+ buffer_len(&channels[channel].input));
+ channels[channel].type = SSH_CHANNEL_OUTPUT_DRAINING;
+ }
}
/* This is called after receiving CHANNEL_CLOSE_CONFIRMATION/OCLOSE. */
-void channel_input_close_confirmation()
+void
+channel_input_close_confirmation()
{
- int channel;
-
- /* Get the channel number and verify it. */
- channel = packet_get_int();
- if (channel < 0 || channel >= channels_alloc)
- packet_disconnect("Received close confirmation for out-of-range channel %d.",
- channel);
-
- if(!compat13){
- /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
- chan_rcvd_oclose(&channels[channel]);
- return;
- }
-
- if (channels[channel].type != SSH_CHANNEL_CLOSED)
- packet_disconnect("Received close confirmation for non-closed channel %d (type %d).",
- channel, channels[channel].type);
-
- /* Free the channel. */
- channel_free(channel);
+ int channel;
+
+ /* Get the channel number and verify it. */
+ channel = packet_get_int();
+ if (channel < 0 || channel >= channels_alloc)
+ packet_disconnect("Received close confirmation for out-of-range channel %d.",
+ channel);
+
+ if (!compat13) {
+ /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
+ chan_rcvd_oclose(&channels[channel]);
+ return;
+ }
+ if (channels[channel].type != SSH_CHANNEL_CLOSED)
+ packet_disconnect("Received close confirmation for non-closed channel %d (type %d).",
+ channel, channels[channel].type);
+
+ /* Free the channel. */
+ channel_free(channel);
}
/* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
-void channel_input_open_confirmation()
+void
+channel_input_open_confirmation()
{
- int channel, remote_channel;
-
- /* Get the channel number and verify it. */
- channel = packet_get_int();
- if (channel < 0 || channel >= channels_alloc ||
- channels[channel].type != SSH_CHANNEL_OPENING)
- packet_disconnect("Received open confirmation for non-opening channel %d.",
- channel);
-
- /* Get remote side's id for this channel. */
- remote_channel = packet_get_int();
-
- /* Record the remote channel number and mark that the channel is now open. */
- channels[channel].remote_id = remote_channel;
- channels[channel].type = SSH_CHANNEL_OPEN;
+ int channel, remote_channel;
+
+ /* Get the channel number and verify it. */
+ channel = packet_get_int();
+ if (channel < 0 || channel >= channels_alloc ||
+ channels[channel].type != SSH_CHANNEL_OPENING)
+ packet_disconnect("Received open confirmation for non-opening channel %d.",
+ channel);
+
+ /* Get remote side's id for this channel. */
+ remote_channel = packet_get_int();
+
+ /* Record the remote channel number and mark that the channel is
+ now open. */
+ channels[channel].remote_id = remote_channel;
+ channels[channel].type = SSH_CHANNEL_OPEN;
}
/* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
-void channel_input_open_failure()
+void
+channel_input_open_failure()
{
- int channel;
-
- /* Get the channel number and verify it. */
- channel = packet_get_int();
- if (channel < 0 || channel >= channels_alloc ||
- channels[channel].type != SSH_CHANNEL_OPENING)
- packet_disconnect("Received open failure for non-opening channel %d.",
- channel);
-
- /* Free the channel. This will also close the socket. */
- channel_free(channel);
+ int channel;
+
+ /* Get the channel number and verify it. */
+ channel = packet_get_int();
+ if (channel < 0 || channel >= channels_alloc ||
+ channels[channel].type != SSH_CHANNEL_OPENING)
+ packet_disconnect("Received open failure for non-opening channel %d.",
+ channel);
+
+ /* Free the channel. This will also close the socket. */
+ channel_free(channel);
}
/* Stops listening for channels, and removes any unix domain sockets that
we might have. */
-void channel_stop_listening()
+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);
- remove(channels[i].path);
- channel_free(i);
- break;
- case SSH_CHANNEL_PORT_LISTENER:
- case SSH_CHANNEL_X11_LISTENER:
- close(channels[i].sock);
- channel_free(i);
- break;
- default:
- break;
+ int i;
+ for (i = 0; i < channels_alloc; i++) {
+ switch (channels[i].type) {
+ case SSH_CHANNEL_AUTH_SOCKET:
+ close(channels[i].sock);
+ remove(channels[i].path);
+ channel_free(i);
+ break;
+ case SSH_CHANNEL_PORT_LISTENER:
+ case SSH_CHANNEL_X11_LISTENER:
+ close(channels[i].sock);
+ channel_free(i);
+ break;
+ default:
+ break;
+ }
}
- }
}
/* Closes the sockets of all channels. This is used to close extra file
descriptors after a fork. */
-void channel_close_all()
+void
+channel_close_all()
{
- int i;
- for (i = 0; i < channels_alloc; i++)
- {
- if (channels[i].type != SSH_CHANNEL_FREE)
- close(channels[i].sock);
- }
+ int i;
+ for (i = 0; i < channels_alloc; i++) {
+ if (channels[i].type != SSH_CHANNEL_FREE)
+ close(channels[i].sock);
+ }
}
/* Returns the maximum file descriptor number used by the channels. */
-int channel_max_fd()
+int
+channel_max_fd()
{
- return channel_max_fd_value;
+ return channel_max_fd_value;
}
/* Returns true if any channel is still open. */
-int channel_still_open()
+int
+channel_still_open()
{
- unsigned 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_CLOSED:
- case SSH_CHANNEL_AUTH_SOCKET:
- 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;
+ unsigned 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_CLOSED:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ 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 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()
+char *
+channel_open_message()
{
- Buffer buffer;
- int i;
- char buf[512], *cp;
-
- 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_CLOSED:
- case SSH_CHANNEL_AUTH_SOCKET:
- continue;
- case SSH_CHANNEL_OPENING:
- 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 o%d)\r\n",
- c->self,c->remote_name,
- c->type,c->remote_id, c->istate,c->ostate);
+ Buffer buffer;
+ int i;
+ char buf[512], *cp;
+
+ buffer_init(&buffer);
+ snprintf(buf, sizeof buf, "The following connections are open:\r\n");
buffer_append(&buffer, buf, strlen(buf));
- continue;
- default:
- fatal("channel_still_open: bad channel type %d", c->type);
- /*NOTREACHED*/
- }
- }
- buffer_append(&buffer, "\0", 1);
- cp = xstrdup(buffer_ptr(&buffer));
- buffer_free(&buffer);
- return cp;
+ 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_CLOSED:
+ case SSH_CHANNEL_AUTH_SOCKET:
+ continue;
+ case SSH_CHANNEL_OPENING:
+ 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 o%d)\r\n",
+ c->self, c->remote_name,
+ c->type, c->remote_id, c->istate, c->ostate);
+ buffer_append(&buffer, buf, strlen(buf));
+ continue;
+ default:
+ fatal("channel_still_open: bad channel type %d", c->type);
+ /* NOTREACHED */
+ }
+ }
+ buffer_append(&buffer, "\0", 1);
+ cp = xstrdup(buffer_ptr(&buffer));
+ buffer_free(&buffer);
+ return cp;
}
/* Initiate forwarding of connections to local port "port" through the secure
channel to host:port from remote side. */
-void channel_request_local_forwarding(int port, const char *host,
- int host_port)
+void
+channel_request_local_forwarding(int port, const char *host,
+ int host_port)
{
- int ch, sock;
- struct sockaddr_in sin;
- extern Options options;
-
- if (strlen(host) > sizeof(channels[0].path) - 1)
- packet_disconnect("Forward host name too long.");
-
- /* Create a port to listen for the host. */
- sock = socket(AF_INET, SOCK_STREAM, 0);
- if (sock < 0)
- packet_disconnect("socket: %.100s", strerror(errno));
-
- /* Initialize socket address. */
- memset(&sin, 0, sizeof(sin));
- sin.sin_family = AF_INET;
- if (options.gateway_ports == 1)
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- else
- sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- sin.sin_port = htons(port);
-
- /* Bind the socket to the address. */
- if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
- packet_disconnect("bind: %.100s", strerror(errno));
-
- /* Start listening for connections on the socket. */
- if (listen(sock, 5) < 0)
- packet_disconnect("listen: %.100s", strerror(errno));
-
- /* Allocate a channel number for the socket. */
- ch = channel_allocate(SSH_CHANNEL_PORT_LISTENER, sock,
- xstrdup("port listener"));
- strcpy(channels[ch].path, host); /* note: host name stored here */
- channels[ch].host_port = host_port; /* port on host to connect to */
- channels[ch].listening_port = port; /* port being listened */
-}
+ int ch, sock;
+ struct sockaddr_in sin;
+ extern Options options;
+
+ if (strlen(host) > sizeof(channels[0].path) - 1)
+ packet_disconnect("Forward host name too long.");
+
+ /* Create a port to listen for the host. */
+ sock = socket(AF_INET, SOCK_STREAM, 0);
+ if (sock < 0)
+ packet_disconnect("socket: %.100s", strerror(errno));
+
+ /* Initialize socket address. */
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ if (options.gateway_ports == 1)
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ else
+ sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ sin.sin_port = htons(port);
+
+ /* Bind the socket to the address. */
+ if (bind(sock, (struct sockaddr *) & sin, sizeof(sin)) < 0)
+ packet_disconnect("bind: %.100s", strerror(errno));
+
+ /* Start listening for connections on the socket. */
+ if (listen(sock, 5) < 0)
+ packet_disconnect("listen: %.100s", strerror(errno));
+
+ /* Allocate a channel number for the socket. */
+ ch = channel_allocate(SSH_CHANNEL_PORT_LISTENER, sock,
+ xstrdup("port listener"));
+ strcpy(channels[ch].path, host);
+ channels[ch].host_port = host_port;
+ channels[ch].listening_port = port;
+}
/* Initiate forwarding of connections to port "port" on remote host through
the secure channel to host:port from local side. */
-void channel_request_remote_forwarding(int port, const char *host,
- int remote_port)
+void
+channel_request_remote_forwarding(int port, const char *host,
+ int remote_port)
{
- int payload_len;
- /* Record locally that connection to this host/port is permitted. */
- if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
- fatal("channel_request_remote_forwarding: too many forwards");
- permitted_opens[num_permitted_opens].host = xstrdup(host);
- permitted_opens[num_permitted_opens].port = remote_port;
- num_permitted_opens++;
-
- /* Send the forward request to the remote side. */
- packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
- packet_put_int(port);
- packet_put_string(host, strlen(host));
- packet_put_int(remote_port);
- packet_send();
- packet_write_wait();
-
- /* Wait for response from the remote side. It will send a disconnect
- message on failure, and we will never see it here. */
- packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
+ int payload_len;
+ /* Record locally that connection to this host/port is permitted. */
+ if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
+ fatal("channel_request_remote_forwarding: too many forwards");
+
+ permitted_opens[num_permitted_opens].host = xstrdup(host);
+ permitted_opens[num_permitted_opens].port = remote_port;
+ num_permitted_opens++;
+
+ /* Send the forward request to the remote side. */
+ packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
+ packet_put_int(port);
+ packet_put_string(host, strlen(host));
+ packet_put_int(remote_port);
+ packet_send();
+ packet_write_wait();
+
+ /* Wait for response from the remote side. It will send a
+ disconnect message on failure, and we will never see it here. */
+ packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
}
/* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
listening for the port, and sends back a success reply (or disconnect
- message if there was an error). This never returns if there was an
+ message if there was an error). This never returns if there was an
error. */
-void channel_input_port_forward_request(int is_root)
+void
+channel_input_port_forward_request(int is_root)
{
- int port, host_port;
- char *hostname;
-
- /* Get arguments from the packet. */
- port = packet_get_int();
- hostname = packet_get_string(NULL);
- host_port = packet_get_int();
-
- /* Port numbers are 16 bit quantities. */
- if ((port & 0xffff) != port)
- packet_disconnect("Requested forwarding of nonexistent port %d.", port);
-
- /* Check that an unprivileged user is not trying to forward a privileged
- port. */
- if (port < IPPORT_RESERVED && !is_root)
- packet_disconnect("Requested forwarding of port %d but user is not root.",
- port);
-
- /* Initiate forwarding. */
- channel_request_local_forwarding(port, hostname, host_port);
-
- /* Free the argument string. */
- xfree(hostname);
+ int port, host_port;
+ char *hostname;
+
+ /* Get arguments from the packet. */
+ port = packet_get_int();
+ hostname = packet_get_string(NULL);
+ host_port = packet_get_int();
+
+ /* Port numbers are 16 bit quantities. */
+ if ((port & 0xffff) != port)
+ packet_disconnect("Requested forwarding of nonexistent port %d.", port);
+
+ /* Check that an unprivileged user is not trying to forward a
+ privileged port. */
+ if (port < IPPORT_RESERVED && !is_root)
+ packet_disconnect("Requested forwarding of port %d but user is not root.",
+ port);
+
+ /* Initiate forwarding. */
+ channel_request_local_forwarding(port, hostname, host_port);
+
+ /* Free the argument string. */
+ xfree(hostname);
}
/* 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 payload_len)
+void
+channel_input_port_open(int payload_len)
{
- int remote_channel, sock, newch, host_port, i;
- struct sockaddr_in sin;
- char *host, *originator_string;
- struct hostent *hp;
- int host_len, originator_len;
-
- /* Get remote channel number. */
- remote_channel = packet_get_int();
-
- /* Get host name to connect to. */
- host = packet_get_string(&host_len);
-
- /* Get port to connect to. */
- host_port = packet_get_int();
-
- /* Get remote originator name. */
- if (have_hostname_in_open)
- originator_string = packet_get_string(&originator_len);
- else
- originator_string = xstrdup("unknown (remote did not supply name)");
-
- packet_integrity_check(payload_len,
- 4 + 4 + host_len + 4 + 4 + originator_len,
- SSH_MSG_PORT_OPEN);
-
- /* Check if opening that port is permitted. */
- if (!all_opens_permitted)
- {
- /* Go trough all permitted ports. */
- for (i = 0; i < num_permitted_opens; i++)
- if (permitted_opens[i].port == host_port &&
- strcmp(permitted_opens[i].host, host) == 0)
- break;
-
- /* Check if we found the requested port among those permitted. */
- if (i >= num_permitted_opens)
- {
- /* The port is not permitted. */
- log("Received request to connect to %.100s:%d, but the request was denied.",
- host, host_port);
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_channel);
- packet_send();
+ int remote_channel, sock, newch, host_port, i;
+ struct sockaddr_in sin;
+ char *host, *originator_string;
+ struct hostent *hp;
+ int host_len, originator_len;
+
+ /* Get remote channel number. */
+ remote_channel = packet_get_int();
+
+ /* Get host name to connect to. */
+ host = packet_get_string(&host_len);
+
+ /* Get port to connect to. */
+ host_port = packet_get_int();
+
+ /* Get remote originator name. */
+ if (have_hostname_in_open)
+ originator_string = packet_get_string(&originator_len);
+ else
+ originator_string = xstrdup("unknown (remote did not supply name)");
+
+ packet_integrity_check(payload_len,
+ 4 + 4 + host_len + 4 + 4 + originator_len,
+ SSH_MSG_PORT_OPEN);
+
+ /* Check if opening that port is permitted. */
+ if (!all_opens_permitted) {
+ /* Go trough all permitted ports. */
+ for (i = 0; i < num_permitted_opens; i++)
+ if (permitted_opens[i].port == host_port &&
+ strcmp(permitted_opens[i].host, host) == 0)
+ break;
+
+ /* Check if we found the requested port among those permitted. */
+ if (i >= num_permitted_opens) {
+ /* The port is not permitted. */
+ log("Received request to connect to %.100s:%d, but the request was denied.",
+ host, host_port);
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_channel);
+ packet_send();
+ }
}
- }
-
- memset(&sin, 0, sizeof(sin));
- sin.sin_addr.s_addr = inet_addr(host);
- if ((sin.sin_addr.s_addr & 0xffffffff) != 0xffffffff)
- {
- /* It was a valid numeric host address. */
- sin.sin_family = AF_INET;
- }
- else
- {
- /* Look up the host address from the name servers. */
- hp = gethostbyname(host);
- if (!hp)
- {
- error("%.100s: unknown host.", host);
- goto fail;
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_addr.s_addr = inet_addr(host);
+ if ((sin.sin_addr.s_addr & 0xffffffff) != 0xffffffff) {
+ /* It was a valid numeric host address. */
+ sin.sin_family = AF_INET;
+ } else {
+ /* Look up the host address from the name servers. */
+ hp = gethostbyname(host);
+ if (!hp) {
+ error("%.100s: unknown host.", host);
+ goto fail;
+ }
+ if (!hp->h_addr_list[0]) {
+ error("%.100s: host has no IP address.", host);
+ goto fail;
+ }
+ sin.sin_family = hp->h_addrtype;
+ memcpy(&sin.sin_addr, hp->h_addr_list[0],
+ sizeof(sin.sin_addr));
}
- if (!hp->h_addr_list[0])
- {
- error("%.100s: host has no IP address.", host);
- goto fail;
+ sin.sin_port = htons(host_port);
+
+ /* Create the socket. */
+ sock = socket(sin.sin_family, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("socket: %.100s", strerror(errno));
+ goto fail;
+ }
+ /* Connect to the host/port. */
+ if (connect(sock, (struct sockaddr *) & sin, sizeof(sin)) < 0) {
+ error("connect %.100s:%d: %.100s", host, host_port,
+ strerror(errno));
+ close(sock);
+ goto fail;
}
- sin.sin_family = hp->h_addrtype;
- memcpy(&sin.sin_addr, hp->h_addr_list[0],
- sizeof(sin.sin_addr));
- }
- sin.sin_port = htons(host_port);
-
- /* Create the socket. */
- sock = socket(sin.sin_family, SOCK_STREAM, 0);
- if (sock < 0)
- {
- error("socket: %.100s", strerror(errno));
- goto fail;
- }
-
- /* Connect to the host/port. */
- if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
- {
- error("connect %.100s:%d: %.100s", host, host_port,
- strerror(errno));
- close(sock);
- goto fail;
- }
-
- /* Successful connection. */
-
- /* Allocate a channel for this connection. */
- newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string);
- 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();
-
- /* Free the argument string. */
- xfree(host);
-
- return;
-
- fail:
- /* Free the argument string. */
- xfree(host);
-
- /* Send refusal to the remote host. */
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_channel);
- packet_send();
+ /* Successful connection. */
+
+ /* Allocate a channel for this connection. */
+ newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string);
+ 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();
+
+ /* Free the argument string. */
+ xfree(host);
+
+ return;
+
+fail:
+ /* Free the argument string. */
+ xfree(host);
+
+ /* Send refusal to the remote host. */
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_channel);
+ packet_send();
}
-/* Creates an internet domain socket for listening for X11 connections.
+/* Creates an internet domain socket for listening for X11 connections.
Returns a suitable value for the DISPLAY variable, or NULL if an error
occurs. */
-char *x11_create_display_inet(int screen_number)
+char *
+x11_create_display_inet(int screen_number)
{
- extern ServerOptions options;
- int display_number, port, sock;
- struct sockaddr_in sin;
- char buf[512];
- char hostname[MAXHOSTNAMELEN];
-
- for (display_number = options.x11_display_offset; display_number < MAX_DISPLAYS; display_number++)
- {
- port = 6000 + display_number;
- memset(&sin, 0, sizeof(sin));
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = htons(port);
-
- sock = socket(AF_INET, SOCK_STREAM, 0);
- if (sock < 0)
- {
- error("socket: %.100s", strerror(errno));
- return NULL;
+ extern ServerOptions options;
+ int display_number, port, sock;
+ struct sockaddr_in sin;
+ char buf[512];
+ char hostname[MAXHOSTNAMELEN];
+
+ for (display_number = options.x11_display_offset;
+ display_number < MAX_DISPLAYS;
+ display_number++) {
+ port = 6000 + display_number;
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ sin.sin_port = htons(port);
+
+ sock = socket(AF_INET, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("socket: %.100s", strerror(errno));
+ return NULL;
+ }
+ if (bind(sock, (struct sockaddr *) & sin, sizeof(sin)) < 0) {
+ debug("bind port %d: %.100s", port, strerror(errno));
+ shutdown(sock, SHUT_RDWR);
+ close(sock);
+ continue;
+ }
+ break;
+ }
+ if (display_number >= MAX_DISPLAYS) {
+ error("Failed to allocate internet-domain X11 display socket.");
+ return NULL;
}
-
- if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
- {
- debug("bind port %d: %.100s", port, strerror(errno));
- shutdown(sock, SHUT_RDWR);
- close(sock);
- continue;
+ /* Start listening for connections on the socket. */
+ if (listen(sock, 5) < 0) {
+ error("listen: %.100s", strerror(errno));
+ shutdown(sock, SHUT_RDWR);
+ close(sock);
+ return NULL;
}
- break;
- }
- if (display_number >= MAX_DISPLAYS)
- {
- error("Failed to allocate internet-domain X11 display socket.");
- return NULL;
- }
-
- /* Start listening for connections on the socket. */
- if (listen(sock, 5) < 0)
- {
- error("listen: %.100s", strerror(errno));
- shutdown(sock, SHUT_RDWR);
- close(sock);
- return NULL;
- }
-
- /* Set up a suitable value for the DISPLAY variable. */
- if (gethostname(hostname, sizeof(hostname)) < 0)
- fatal("gethostname: %.100s", strerror(errno));
- snprintf(buf, sizeof buf, "%.400s:%d.%d", hostname,
- display_number, screen_number);
-
- /* Allocate a channel for the socket. */
- (void)channel_allocate(SSH_CHANNEL_X11_LISTENER, sock,
- xstrdup("X11 inet listener"));
-
- /* Return a suitable value for the DISPLAY environment variable. */
- return xstrdup(buf);
+ /* Set up a suitable value for the DISPLAY variable. */
+ if (gethostname(hostname, sizeof(hostname)) < 0)
+ fatal("gethostname: %.100s", strerror(errno));
+ snprintf(buf, sizeof buf, "%.400s:%d.%d", hostname,
+ display_number, screen_number);
+
+ /* Allocate a channel for the socket. */
+ (void) channel_allocate(SSH_CHANNEL_X11_LISTENER, sock,
+ xstrdup("X11 inet listener"));
+
+ /* Return a suitable value for the DISPLAY environment variable. */
+ return xstrdup(buf);
}
#ifndef X_UNIX_PATH
@@ -1150,30 +1108,29 @@ static
int
connect_local_xsocket(unsigned 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);
- }
- error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
- return -1;
+ 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);
+ }
+ error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
+ return -1;
}
@@ -1181,327 +1138,317 @@ connect_local_xsocket(unsigned dnr)
the remote channel number. We should do whatever we want, and respond
with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
-void x11_input_open(int payload_len)
+void
+x11_input_open(int payload_len)
{
- int remote_channel, display_number, sock, newch;
- const char *display;
- struct sockaddr_in sin;
- char buf[1024], *cp, *remote_host;
- struct hostent *hp;
- int remote_len;
-
- /* Get remote channel number. */
- remote_channel = packet_get_int();
-
- /* Get remote originator name. */
- if (have_hostname_in_open)
- remote_host = packet_get_string(&remote_len);
- else
- remote_host = xstrdup("unknown (remote did not supply name)");
-
- debug("Received X11 open request.");
- packet_integrity_check(payload_len, 4 + 4+remote_len, SSH_SMSG_X11_OPEN);
-
- /* Try to open a socket for the local X server. */
- display = getenv("DISPLAY");
- if (!display)
- {
- error("DISPLAY not set.");
- goto fail;
- }
-
- /* Now we decode the value of the DISPLAY variable and make a connection
- to the real X server. */
-
- /* Check if it is a unix domain socket. Unix domain displays are in one
- of the following formats: unix:d[.s], :d[.s], ::d[.s] */
- if (strncmp(display, "unix:", 5) == 0 ||
- display[0] == ':')
- {
- /* 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);
- goto fail;
+ int remote_channel, display_number, sock, newch;
+ const char *display;
+ struct sockaddr_in sin;
+ char buf[1024], *cp, *remote_host;
+ struct hostent *hp;
+ int remote_len;
+
+ /* Get remote channel number. */
+ remote_channel = packet_get_int();
+
+ /* Get remote originator name. */
+ if (have_hostname_in_open)
+ remote_host = packet_get_string(&remote_len);
+ else
+ remote_host = xstrdup("unknown (remote did not supply name)");
+
+ debug("Received X11 open request.");
+ packet_integrity_check(payload_len, 4 + 4 + remote_len, SSH_SMSG_X11_OPEN);
+
+ /* Try to open a socket for the local X server. */
+ display = getenv("DISPLAY");
+ if (!display) {
+ error("DISPLAY not set.");
+ goto fail;
+ }
+ /* Now we decode the value of the DISPLAY variable and make a
+ connection to the real X server. */
+
+ /* Check if it is a unix domain socket. Unix domain displays are
+ in one of the following formats: unix:d[.s], :d[.s], ::d[.s] */
+ if (strncmp(display, "unix:", 5) == 0 ||
+ display[0] == ':') {
+ /* 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);
+ goto fail;
+ }
+ /* Create a socket. */
+ sock = connect_local_xsocket(display_number);
+ if (sock < 0)
+ goto fail;
+
+ /* OK, we now have a connection to the display. */
+ goto success;
+ }
+ /* 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;
+ cp = strchr(buf, ':');
+ if (!cp) {
+ error("Could not find ':' in DISPLAY: %.100s", display);
+ goto fail;
+ }
+ *cp = 0;
+ /* 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);
+ goto fail;
+ }
+ /* Try to parse the host name as a numeric IP address. */
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_addr.s_addr = inet_addr(buf);
+ if ((sin.sin_addr.s_addr & 0xffffffff) != 0xffffffff) {
+ /* It was a valid numeric host address. */
+ sin.sin_family = AF_INET;
+ } else {
+ /* Not a numeric IP address. */
+ /* Look up the host address from the name servers. */
+ hp = gethostbyname(buf);
+ if (!hp) {
+ error("%.100s: unknown host.", buf);
+ goto fail;
+ }
+ if (!hp->h_addr_list[0]) {
+ error("%.100s: host has no IP address.", buf);
+ goto fail;
+ }
+ sin.sin_family = hp->h_addrtype;
+ memcpy(&sin.sin_addr, hp->h_addr_list[0],
+ sizeof(sin.sin_addr));
}
- /* Create a socket. */
- sock = connect_local_xsocket(display_number);
- if (sock < 0)
- goto fail;
-
- /* OK, we now have a connection to the display. */
- goto success;
- }
-
- /* 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;
- cp = strchr(buf, ':');
- if (!cp)
- {
- error("Could not find ':' in DISPLAY: %.100s", display);
- goto fail;
- }
- *cp = 0;
- /* 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);
- goto fail;
- }
-
- /* Try to parse the host name as a numeric IP address. */
- memset(&sin, 0, sizeof(sin));
- sin.sin_addr.s_addr = inet_addr(buf);
- if ((sin.sin_addr.s_addr & 0xffffffff) != 0xffffffff)
- {
- /* It was a valid numeric host address. */
- sin.sin_family = AF_INET;
- }
- else
- {
- /* Not a numeric IP address. */
- /* Look up the host address from the name servers. */
- hp = gethostbyname(buf);
- if (!hp)
- {
- error("%.100s: unknown host.", buf);
- goto fail;
+ /* Set port number. */
+ sin.sin_port = htons(6000 + display_number);
+
+ /* Create a socket. */
+ sock = socket(sin.sin_family, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("socket: %.100s", strerror(errno));
+ goto fail;
}
- if (!hp->h_addr_list[0])
- {
- error("%.100s: host has no IP address.", buf);
- goto fail;
+ /* Connect it to the display. */
+ if (connect(sock, (struct sockaddr *) & sin, sizeof(sin)) < 0) {
+ error("connect %.100s:%d: %.100s", buf, 6000 + display_number,
+ strerror(errno));
+ close(sock);
+ goto fail;
}
- sin.sin_family = hp->h_addrtype;
- memcpy(&sin.sin_addr, hp->h_addr_list[0],
- sizeof(sin.sin_addr));
- }
- /* Set port number. */
- sin.sin_port = htons(6000 + display_number);
-
- /* Create a socket. */
- sock = socket(sin.sin_family, SOCK_STREAM, 0);
- if (sock < 0)
- {
- error("socket: %.100s", strerror(errno));
- goto fail;
- }
- /* Connect it to the display. */
- if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
- {
- error("connect %.100s:%d: %.100s", buf, 6000 + display_number,
- strerror(errno));
- close(sock);
- goto fail;
- }
-
- success:
- /* We have successfully obtained a connection to the real X display. */
-
- /* Allocate a channel for this connection. */
- if (x11_saved_proto == NULL)
- newch = channel_allocate(SSH_CHANNEL_OPEN, sock, remote_host);
- else
- newch = channel_allocate(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();
-
- return;
-
- fail:
- /* Send refusal to the remote host. */
- packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
- packet_put_int(remote_channel);
- packet_send();
+success:
+ /* We have successfully obtained a connection to the real X display. */
+
+ /* Allocate a channel for this connection. */
+ if (x11_saved_proto == NULL)
+ newch = channel_allocate(SSH_CHANNEL_OPEN, sock, remote_host);
+ else
+ newch = channel_allocate(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();
+
+ return;
+
+fail:
+ /* Send refusal to the remote host. */
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_channel);
+ packet_send();
}
/* Requests forwarding of X11 connections, generates fake authentication
data, and enables authentication spoofing. */
-void x11_request_forwarding_with_spoofing(const char *proto, const char *data)
+void
+x11_request_forwarding_with_spoofing(const char *proto, const char *data)
{
- unsigned int data_len = (unsigned int)strlen(data) / 2;
- unsigned int i, value;
- char *new_data;
- int screen_number;
- const char *cp;
- u_int32_t rand = 0;
-
- cp = getenv("DISPLAY");
- if (cp)
- cp = strchr(cp, ':');
- if (cp)
- cp = strchr(cp, '.');
- if (cp)
- screen_number = atoi(cp + 1);
- else
- screen_number = 0;
-
- /* Save protocol name. */
- x11_saved_proto = xstrdup(proto);
-
- /* Extract real authentication data and generate fake data of the same
- length. */
- x11_saved_data = xmalloc(data_len);
- x11_fake_data = xmalloc(data_len);
- for (i = 0; i < data_len; i++)
- {
- if (sscanf(data + 2 * i, "%2x", &value) != 1)
- fatal("x11_request_forwarding: bad authentication data: %.100s", data);
- if (i % 4 == 0)
- rand = arc4random();
- x11_saved_data[i] = value;
- x11_fake_data[i] = rand & 0xff;
- rand >>= 8;
- }
- x11_saved_data_len = data_len;
- x11_fake_data_len = data_len;
-
- /* Convert the fake data into hex. */
- new_data = xmalloc(2 * data_len + 1);
- for (i = 0; i < data_len; i++)
- sprintf(new_data + 2 * i, "%02x", (unsigned char)x11_fake_data[i]);
-
- /* Send the request packet. */
- packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
- packet_put_string(proto, strlen(proto));
- packet_put_string(new_data, strlen(new_data));
- packet_put_int(screen_number);
- packet_send();
- packet_write_wait();
- xfree(new_data);
+ unsigned int data_len = (unsigned int) strlen(data) / 2;
+ unsigned int i, value;
+ char *new_data;
+ int screen_number;
+ const char *cp;
+ u_int32_t rand = 0;
+
+ cp = getenv("DISPLAY");
+ if (cp)
+ cp = strchr(cp, ':');
+ if (cp)
+ cp = strchr(cp, '.');
+ if (cp)
+ screen_number = atoi(cp + 1);
+ else
+ screen_number = 0;
+
+ /* Save protocol name. */
+ x11_saved_proto = xstrdup(proto);
+
+ /* Extract real authentication data and generate fake data of the
+ same length. */
+ x11_saved_data = xmalloc(data_len);
+ x11_fake_data = xmalloc(data_len);
+ for (i = 0; i < data_len; i++) {
+ if (sscanf(data + 2 * i, "%2x", &value) != 1)
+ fatal("x11_request_forwarding: bad authentication data: %.100s", data);
+ if (i % 4 == 0)
+ rand = arc4random();
+ x11_saved_data[i] = value;
+ x11_fake_data[i] = rand & 0xff;
+ rand >>= 8;
+ }
+ x11_saved_data_len = data_len;
+ x11_fake_data_len = data_len;
+
+ /* Convert the fake data into hex. */
+ new_data = xmalloc(2 * data_len + 1);
+ for (i = 0; i < data_len; i++)
+ sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]);
+
+ /* Send the request packet. */
+ packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
+ packet_put_string(proto, strlen(proto));
+ packet_put_string(new_data, strlen(new_data));
+ packet_put_int(screen_number);
+ packet_send();
+ packet_write_wait();
+ xfree(new_data);
}
/* Sends a message to the server to request authentication fd forwarding. */
-void auth_request_forwarding()
+void
+auth_request_forwarding()
{
- packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
- packet_send();
- packet_write_wait();
+ 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()
+char *
+auth_get_socket_name()
{
- return channel_forwarded_auth_socket_name;
+ return channel_forwarded_auth_socket_name;
}
/* removes the agent forwarding socket */
-void cleanup_socket(void) {
- remove(channel_forwarded_auth_socket_name);
- rmdir(channel_forwarded_auth_socket_dir);
+void
+cleanup_socket(void)
+{
+ remove(channel_forwarded_auth_socket_name);
+ rmdir(channel_forwarded_auth_socket_dir);
}
/* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
This starts forwarding authentication requests. */
-void auth_input_request_forwarding(struct passwd *pw)
+void
+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->pw_uid);
-
- /* 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_disconnect("mkdtemp: %.100s", strerror(errno));
- 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_allocate(SSH_CHANNEL_AUTH_SOCKET, sock,
- xstrdup("auth socket"));
- strcpy(channels[newch].path, channel_forwarded_auth_socket_name);
+ 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->pw_uid);
+
+ /* 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_disconnect("mkdtemp: %.100s", strerror(errno));
+ 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_allocate(SSH_CHANNEL_AUTH_SOCKET, sock,
+ xstrdup("auth socket"));
+ strcpy(channels[newch].path, channel_forwarded_auth_socket_name);
}
/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
-void auth_input_open_request()
+void
+auth_input_open_request()
{
- int remch, sock, newch;
- char *dummyname;
-
- /* 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();
+ int remch, sock, newch;
+ char *dummyname;
+
+ /* 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();
}