- OpenBSD CVS update:
- [packet.h packet.c]
ssh2 packet format
- [packet.h packet.c nchan2.ms nchan.h compat.h compat.c]
[channels.h channels.c]
channel layer support for ssh2
- [kex.h kex.c hmac.h hmac.c dsa.c dsa.h]
DSA, keyexchange, algorithm agreement for ssh2
diff --git a/ChangeLog b/ChangeLog
index 2beaf7f..906e09f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
20000404
- Add tests for RAND_add function when searching for OpenSSL
+ - OpenBSD CVS update:
+ - [packet.h packet.c]
+ ssh2 packet format
+ - [packet.h packet.c nchan2.ms nchan.h compat.h compat.c]
+ [channels.h channels.c]
+ channel layer support for ssh2
+ - [kex.h kex.c hmac.h hmac.c dsa.c dsa.h]
+ DSA, keyexchange, algorithm agreement for ssh2
20000403
- Wrote entropy collection routines for systems that lack /dev/random
diff --git a/Makefile.in b/Makefile.in
index 89b4084..bb08b53 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -31,7 +31,7 @@
TARGETS=ssh sshd ssh-add ssh-keygen ssh-agent scp $(EXTRA_TARGETS)
-LIBOBJS= atomicio.o authfd.o authfile.o bsd-bindresvport.o bsd-daemon.o bsd-misc.o bsd-mktemp.o bsd-rresvport.o bsd-setenv.o bsd-snprintf.o bsd-strlcat.o bsd-strlcpy.o bufaux.o buffer.o canohost.o channels.o cipher.o compat.o compress.o crc32.o deattack.o dispatch.o fake-getaddrinfo.o fake-getnameinfo.o fingerprint.o hostfile.o key.o log.o match.o mpaux.o nchan.o packet.o radix.o entropy.o readpass.o rsa.o tildexpand.o ttymodes.o uidswap.o xmalloc.o
+LIBOBJS= atomicio.o authfd.o authfile.o bsd-bindresvport.o bsd-daemon.o bsd-misc.o bsd-mktemp.o bsd-rresvport.o bsd-setenv.o bsd-snprintf.o bsd-strlcat.o bsd-strlcpy.o bufaux.o buffer.o canohost.o channels.o cipher.o compat.o compress.o crc32.o deattack.o dispatch.o dsa.o fake-getaddrinfo.o fake-getnameinfo.o fingerprint.o hmac.o hostfile.o key.o kex.o log.o match.o mpaux.o nchan.o packet.o radix.o entropy.o readpass.o rsa.o tildexpand.o ttymodes.o uidswap.o xmalloc.o
SSHOBJS= ssh.o sshconnect.o log-client.o readconf.o clientloop.o
diff --git a/channels.c b/channels.c
index b87ff9f..18f667f 100644
--- a/channels.c
+++ b/channels.c
@@ -13,10 +13,11 @@
* There is also code for initiating connection forwarding for X11 connections,
* arbitrary tcp/ip connections, and the authentication agent connection.
*
+ * SSH2 support added by Markus Friedl.
*/
#include "includes.h"
-RCSID("$Id: channels.c,v 1.20 2000/04/01 01:09:23 damien Exp $");
+RCSID("$Id: channels.c,v 1.21 2000/04/04 04:39:00 damien Exp $");
#include "ssh.h"
#include "packet.h"
@@ -31,6 +32,8 @@
#include "nchan.h"
#include "compat.h"
+#include "ssh2.h"
+
/* Maximum number of fake X11 displays to try. */
#define MAX_DISPLAYS 1000
@@ -165,6 +168,7 @@
/* Do initial allocation if this is the first call. */
if (channels_alloc == 0) {
+ chan_init();
channels_alloc = 10;
channels = xmalloc(channels_alloc * sizeof(Channel));
for (i = 0; i < channels_alloc; i++)
@@ -237,9 +241,28 @@
if (c == NULL)
packet_disconnect("channel free: bad local channel %d", id);
debug("channel_free: channel %d: status: %s", id, channel_open_message());
+ if (c->dettach_user != NULL) {
+ debug("channel_free: channel %d: dettaching channel user", id);
+ c->dettach_user(c->self, NULL);
+ }
if (c->sock != -1) {
shutdown(c->sock, SHUT_RDWR);
close(c->sock);
+ c->sock = -1;
+ }
+ if (compat20) {
+ if (c->rfd != -1) {
+ close(c->rfd);
+ c->rfd = -1;
+ }
+ if (c->wfd != -1) {
+ close(c->wfd);
+ c->wfd = -1;
+ }
+ if (c->efd != -1) {
+ close(c->efd);
+ c->efd = -1;
+ }
}
buffer_free(&c->input);
buffer_free(&c->output);
@@ -296,6 +319,32 @@
}
void
+channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
+{
+ if (c->istate == CHAN_INPUT_OPEN &&
+ c->remote_window > 0 &&
+ buffer_len(&c->input) < c->remote_window)
+ FD_SET(c->rfd, readset);
+ if (c->ostate == CHAN_OUTPUT_OPEN ||
+ c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+ if (buffer_len(&c->output) > 0) {
+ FD_SET(c->wfd, writeset);
+ } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+ chan_obuf_empty(c);
+ }
+ }
+ /** XXX check close conditions, too */
+ if (c->efd != -1) {
+ if (c->extended_usage == CHAN_EXTENDED_WRITE &&
+ buffer_len(&c->extended) > 0)
+ FD_SET(c->efd, writeset);
+ else if (c->extended_usage == CHAN_EXTENDED_READ &&
+ buffer_len(&c->extended) < c->remote_window)
+ FD_SET(c->efd, readset);
+ }
+}
+
+void
channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
{
if (buffer_len(&c->input) == 0) {
@@ -483,15 +532,27 @@
SSH_CHANNEL_OPENING, newsock, newsock, -1,
c->local_window_max, c->local_maxpacket,
0, xstrdup(buf));
-
- packet_start(SSH_MSG_PORT_OPEN);
- packet_put_int(newch);
- packet_put_string(c->path, strlen(c->path));
- packet_put_int(c->host_port);
- if (have_hostname_in_open) {
- packet_put_string(buf, strlen(buf));
+ if (compat20) {
+ packet_start(SSH2_MSG_CHANNEL_OPEN);
+ packet_put_cstring("direct-tcpip");
+ packet_put_int(newch);
+ packet_put_int(c->local_window_max);
+ packet_put_int(c->local_maxpacket);
+ packet_put_string(c->path, strlen(c->path));
+ packet_put_int(c->host_port);
+ packet_put_cstring(remote_hostname);
+ packet_put_int(remote_port);
+ packet_send();
+ } else {
+ packet_start(SSH_MSG_PORT_OPEN);
+ packet_put_int(newch);
+ packet_put_string(c->path, strlen(c->path));
+ packet_put_int(c->host_port);
+ if (have_hostname_in_open) {
+ packet_put_string(buf, strlen(buf));
+ }
+ packet_send();
}
- packet_send();
xfree(remote_hostname);
}
}
@@ -569,6 +630,56 @@
return -1;
}
buffer_consume(&c->output, len);
+ if (compat20 && len > 0) {
+ c->local_consumed += len;
+ }
+ }
+ return 1;
+}
+int
+channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
+{
+ char buf[16*1024];
+ int len;
+
+ if (c->efd != -1) {
+ if (c->extended_usage == CHAN_EXTENDED_WRITE &&
+ FD_ISSET(c->efd, writeset) &&
+ buffer_len(&c->extended) > 0) {
+ len = write(c->efd, buffer_ptr(&c->extended),
+ buffer_len(&c->extended));
+ debug("channel %d: written %d to efd %d",
+ c->self, len, c->efd);
+ if (len > 0) {
+ buffer_consume(&c->extended, len);
+ c->local_consumed += len;
+ }
+ } else if (c->extended_usage == CHAN_EXTENDED_READ &&
+ FD_ISSET(c->efd, readset)) {
+ len = read(c->efd, buf, sizeof(buf));
+ debug("channel %d: read %d from efd %d",
+ c->self, len, c->efd);
+ if (len > 0)
+ buffer_append(&c->extended, buf, len);
+ }
+ }
+ return 1;
+}
+int
+channel_check_window(Channel *c, fd_set * readset, fd_set * writeset)
+{
+ if (!(c->flags & CHAN_CLOSE_SENT) &&
+ c->local_window < c->local_window_max/2 &&
+ c->local_consumed > 0) {
+ packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+ packet_put_int(c->remote_id);
+ packet_put_int(c->local_consumed);
+ packet_send();
+ debug("channel %d: window %d sent adjust %d",
+ c->self, c->local_window,
+ c->local_consumed);
+ c->local_window += c->local_consumed;
+ c->local_consumed = 0;
}
return 1;
}
@@ -581,6 +692,15 @@
}
void
+channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
+{
+ channel_handle_rfd(c, readset, writeset);
+ channel_handle_wfd(c, readset, writeset);
+ channel_handle_efd(c, readset, writeset);
+ channel_check_window(c, readset, writeset);
+}
+
+void
channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
{
int len;
@@ -596,6 +716,16 @@
}
void
+channel_handler_init_20(void)
+{
+ channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
+ channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
+
+ channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
+ channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
+}
+
+void
channel_handler_init_13(void)
{
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
@@ -636,7 +766,9 @@
channel_pre[i] = NULL;
channel_post[i] = NULL;
}
- if (compat13)
+ if (compat20)
+ channel_handler_init_20();
+ else if (compat13)
channel_handler_init_13();
else
channel_handler_init_15();
@@ -660,8 +792,7 @@
if (ftab[c->type] == NULL)
continue;
(*ftab[c->type])(c, readset, writeset);
- if (!compat13)
- chan_delete_if_full_closed(c);
+ chan_delete_if_full_closed(c);
}
}
@@ -700,27 +831,39 @@
c->istate != CHAN_INPUT_WAIT_DRAIN)
continue;
}
+ if (compat20 && (c->flags & CHAN_CLOSE_SENT)) {
+ debug("channel: %d: no data after CLOSE", c->self);
+ continue;
+ }
/* Get the amount of buffered data for this channel. */
len = buffer_len(&c->input);
if (len > 0) {
/* Send some data for the other side over the secure connection. */
- if (packet_is_interactive()) {
- if (len > 1024)
- len = 512;
+ if (compat20) {
+ if (len > c->remote_window)
+ len = c->remote_window;
+ if (len > c->remote_maxpacket)
+ len = c->remote_maxpacket;
} else {
- /* Keep the packets at reasonable size. */
- if (len > packet_get_maxsize())
- len = packet_get_maxsize()/2;
+ if (packet_is_interactive()) {
+ if (len > 1024)
+ len = 512;
+ } else {
+ /* Keep the packets at reasonable size. */
+ if (len > packet_get_maxsize()/2)
+ len = packet_get_maxsize()/2;
+ }
}
if (len > 0) {
- packet_start(SSH_MSG_CHANNEL_DATA);
+ packet_start(compat20 ?
+ SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
packet_put_int(c->remote_id);
packet_put_string(buffer_ptr(&c->input), len);
packet_send();
buffer_consume(&c->input, len);
c->remote_window -= len;
-debug("channel %d: send data len %d", c->self, len);
+ debug("channel %d: send data len %d", c->self, len);
}
} else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
if (compat13)
@@ -731,6 +874,23 @@
*/
chan_ibuf_empty(c);
}
+ /* Send extended data, i.e. stderr */
+ if (compat20 &&
+ c->remote_window > 0 &&
+ (len = buffer_len(&c->extended)) > 0 &&
+ c->extended_usage == CHAN_EXTENDED_READ) {
+ if (len > c->remote_window)
+ len = c->remote_window;
+ if (len > c->remote_maxpacket)
+ len = c->remote_maxpacket;
+ packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
+ packet_put_int(c->remote_id);
+ packet_put_int(SSH2_EXTENDED_DATA_STDERR);
+ packet_put_string(buffer_ptr(&c->extended), len);
+ packet_send();
+ buffer_consume(&c->extended, len);
+ c->remote_window -= len;
+ }
}
}
@@ -766,10 +926,63 @@
/* Get the data. */
data = packet_get_string(&data_len);
- packet_integrity_check(plen, 4 + 4 + data_len, SSH_MSG_CHANNEL_DATA);
+ if (compat20){
+ if (data_len > c->local_maxpacket) {
+ log("channel %d: rcvd big packet %d, maxpack %d",
+ c->self, data_len, c->local_maxpacket);
+ }
+ if (data_len > c->local_window) {
+ log("channel %d: rcvd too much data %d, win %d",
+ c->self, data_len, c->local_window);
+ xfree(data);
+ return;
+ }
+ c->local_window -= data_len;
+ }else{
+ packet_integrity_check(plen, 4 + 4 + data_len, type);
+ }
buffer_append(&c->output, data, data_len);
xfree(data);
}
+void
+channel_input_extended_data(int type, int plen)
+{
+ int id;
+ int tcode;
+ char *data;
+ unsigned int data_len;
+ Channel *c;
+
+ /* Get the channel number and verify it. */
+ id = packet_get_int();
+ c = channel_lookup(id);
+
+ if (c == NULL)
+ packet_disconnect("Received extended_data for bad channel %d.", id);
+ if (c->type != SSH_CHANNEL_OPEN) {
+ log("channel %d: ext data for non open", id);
+ return;
+ }
+ tcode = packet_get_int();
+ if (c->efd == -1 ||
+ c->extended_usage != CHAN_EXTENDED_WRITE ||
+ tcode != SSH2_EXTENDED_DATA_STDERR) {
+ log("channel %d: bad ext data", c->self);
+ return;
+ }
+ data = packet_get_string(&data_len);
+ if (data_len > c->local_window) {
+ log("channel %d: rcvd too much extended_data %d, win %d",
+ c->self, data_len, c->local_window);
+ xfree(data);
+ return;
+ }
+ debug("channel %d: rcvd ext data %d", c->self, data_len);
+ c->local_window -= data_len;
+ buffer_append(&c->extended, data, data_len);
+ xfree(data);
+}
+
/*
* Returns true if no channel has too much buffered data, and false if one or
@@ -785,7 +998,7 @@
for (i = 0; i < channels_alloc; i++) {
c = &channels[i];
if (c->type == SSH_CHANNEL_OPEN) {
- if (buffer_len(&c->input) > packet_get_maxsize()) {
+ if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
debug("channel %d: big input buffer %d",
c->self, buffer_len(&c->input));
return 0;
@@ -886,7 +1099,8 @@
int id, remote_id;
Channel *c;
- packet_integrity_check(plen, 4 + 4, type);
+ if (!compat20)
+ packet_integrity_check(plen, 4 + 4, type);
id = packet_get_int();
c = channel_lookup(id);
@@ -898,6 +1112,18 @@
/* Record the remote channel number and mark that the channel is now open. */
c->remote_id = remote_id;
c->type = SSH_CHANNEL_OPEN;
+
+ if (compat20) {
+ c->remote_window = packet_get_int();
+ c->remote_maxpacket = packet_get_int();
+ if (c->cb_fn != NULL && c->cb_event == type) {
+ debug("callback start");
+ c->cb_fn(c->self, c->cb_arg);
+ debug("callback done");
+ }
+ debug("channel %d: open confirm rwindow %d rmax %d", c->self,
+ c->remote_window, c->remote_maxpacket);
+ }
}
void
@@ -906,7 +1132,8 @@
int id;
Channel *c;
- packet_integrity_check(plen, 4, type);
+ if (!compat20)
+ packet_integrity_check(plen, 4, type);
id = packet_get_int();
c = channel_lookup(id);
@@ -914,11 +1141,64 @@
if (c==NULL || c->type != SSH_CHANNEL_OPENING)
packet_disconnect("Received open failure for "
"non-opening channel %d.", id);
-
+ if (compat20) {
+ int reason = packet_get_int();
+ char *msg = packet_get_string(NULL);
+ log("channel_open_failure: %d: reason %d: %s", id, reason, msg);
+ xfree(msg);
+ }
/* Free the channel. This will also close the socket. */
channel_free(id);
}
+void
+channel_input_channel_request(int type, int plen)
+{
+ int id;
+ Channel *c;
+
+ id = packet_get_int();
+ c = channel_lookup(id);
+
+ if (c == NULL ||
+ (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
+ packet_disconnect("Received request for "
+ "non-open channel %d.", id);
+ if (c->cb_fn != NULL && c->cb_event == type) {
+ debug("callback start");
+ c->cb_fn(c->self, c->cb_arg);
+ debug("callback done");
+ } else {
+ char *service = packet_get_string(NULL);
+ debug("channel: %d rcvd request for %s", c->self, service);
+debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
+ xfree(service);
+ }
+}
+
+void
+channel_input_window_adjust(int type, int plen)
+{
+ Channel *c;
+ int id, adjust;
+
+ if (!compat20)
+ return;
+
+ /* Get the channel number and verify it. */
+ id = packet_get_int();
+ c = channel_lookup(id);
+
+ if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
+ log("Received window adjust for "
+ "non-open channel %d.", id);
+ return;
+ }
+ adjust = packet_get_int();
+ debug("channel %d: rcvd adjust %d", id, adjust);
+ c->remote_window += adjust;
+}
+
/*
* Stops listening for channels, and removes any unix domain sockets that we
* might have.
@@ -983,6 +1263,10 @@
case SSH_CHANNEL_CLOSED:
case SSH_CHANNEL_AUTH_SOCKET:
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:
@@ -1024,6 +1308,7 @@
case SSH_CHANNEL_CLOSED:
case SSH_CHANNEL_AUTH_SOCKET:
continue;
+ case SSH_CHANNEL_LARVAL:
case SSH_CHANNEL_OPENING:
case SSH_CHANNEL_OPEN:
case SSH_CHANNEL_X11_OPEN:
@@ -1156,17 +1441,26 @@
num_permitted_opens++;
/* Send the forward request to the remote side. */
- packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
- packet_put_int(port_to_connect);
- packet_put_string(host_to_connect, strlen(host_to_connect));
- packet_put_int(listen_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);
+ if (compat20) {
+ const char *address_to_bind = "0.0.0.0";
+ packet_start(SSH2_MSG_GLOBAL_REQUEST);
+ packet_put_cstring("tcpip-forward");
+ packet_put_char(0); /* boolean: want reply */
+ packet_put_cstring(address_to_bind);
+ packet_put_int(listen_port);
+ } else {
+ packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
+ packet_put_int(port_to_connect);
+ packet_put_cstring(host_to_connect);
+ packet_put_int(listen_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);
+ }
}
/*
@@ -1839,3 +2133,97 @@
packet_put_int(newch);
packet_send();
}
+
+void
+channel_open(int id)
+{
+ Channel *c = channel_lookup(id);
+ if (c == NULL) {
+ log("channel_open: %d: bad id", id);
+ return;
+ }
+ 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();
+ debug("channel open %d", id);
+}
+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_set_fds(int id, int rfd, int wfd, int efd, int extusage)
+{
+ Channel *c = channel_lookup(id);
+ if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
+ fatal("channel_activate for non-larval channel %d.", id);
+ if (rfd > channel_max_fd_value)
+ channel_max_fd_value = rfd;
+ if (wfd > channel_max_fd_value)
+ channel_max_fd_value = wfd;
+ if (efd > channel_max_fd_value)
+ channel_max_fd_value = efd;
+ c->type = SSH_CHANNEL_OPEN;
+ c->rfd = rfd;
+ c->wfd = wfd;
+ c->efd = efd;
+ c->extended_usage = extusage;
+ /* 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();
+}
diff --git a/channels.h b/channels.h
index 73ff5a5..33af09d 100644
--- a/channels.h
+++ b/channels.h
@@ -1,4 +1,4 @@
-/* RCSID("$Id: channels.h,v 1.5 2000/04/01 01:09:23 damien Exp $"); */
+/* RCSID("$Id: channels.h,v 1.6 2000/04/04 04:39:01 damien Exp $"); */
#ifndef CHANNELS_H
#define CHANNELS_H
@@ -30,6 +30,7 @@
/* peer can be reached over encrypted connection, via packet-sent */
int istate; /* input from channel (state of receive half) */
int ostate; /* output to channel (state of transmit half) */
+ int flags; /* close sent/rcvd */
int rfd; /* read fd */
int wfd; /* write fd */
int efd; /* extended fd */
@@ -66,21 +67,30 @@
#define CHAN_EXTENDED_READ 1
#define CHAN_EXTENDED_WRITE 2
+void channel_set_fds(int id, int rfd, int wfd, int efd, int extusage);
void channel_open(int id);
+void channel_request(int id, char *service, int wantconfirm);
+void channel_request_start(int id, char *service, int wantconfirm);
+void channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg);
+void channel_register_cleanup(int id, channel_callback_fn *fn);
+void channel_cancel_cleanup(int id);
Channel *channel_lookup(int id);
int
channel_new(char *ctype, int type, int rfd, int wfd, int efd,
int window, int maxpack, int extended_usage, char *remote_name);
+void channel_input_channel_request(int type, int plen);
void channel_input_close(int type, int plen);
void channel_input_close_confirmation(int type, int plen);
void channel_input_data(int type, int plen);
+void channel_input_extended_data(int type, int plen);
void channel_input_ieof(int type, int plen);
void channel_input_oclose(int type, int plen);
void channel_input_open_confirmation(int type, int plen);
void channel_input_open_failure(int type, int plen);
void channel_input_port_open(int type, int plen);
+void channel_input_window_adjust(int type, int plen);
void channel_input_open(int type, int plen);
/* Sets specific protocol options. */
@@ -218,4 +228,7 @@
/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
void auth_input_open_request(int type, int plen);
+/* XXX */
+int channel_connect_to(const char *host, u_short host_port);
+
#endif
diff --git a/compat.c b/compat.c
index d39a3d6..3ecf710 100644
--- a/compat.c
+++ b/compat.c
@@ -28,15 +28,46 @@
*/
#include "includes.h"
-RCSID("$Id: compat.c,v 1.3 1999/11/25 00:54:59 damien Exp $");
+RCSID("$Id: compat.c,v 1.4 2000/04/04 04:39:01 damien Exp $");
#include "ssh.h"
+#include "packet.h"
int compat13 = 0;
+int compat20 = 0;
+int datafellows = 0;
void
+enable_compat20(void)
+{
+ fatal("protocol 2.0 not implemented");
+}
+void
enable_compat13(void)
{
verbose("Enabling compatibility mode for protocol 1.3");
compat13 = 1;
}
+/* datafellows bug compatibility */
+void
+compat_datafellows(const char *version)
+{
+ int i;
+ size_t len;
+ static const char *check[] = {
+ "2.0.1",
+ "2.1.0.beta.9",
+ "2.1.0.pre.3",
+ "2.1.0.public.beta.1",
+ NULL
+ };
+ for (i = 0; check[i]; i++) {
+ len = strlen(check[i]);
+ if (strlen(version) >= len &&
+ (strncmp(version, check[i], len) == 0)) {
+ log("datafellows: %.200s", version);
+ datafellows = 1;
+ return;
+ }
+ }
+}
diff --git a/compat.h b/compat.h
index 4f53607..4247f53 100644
--- a/compat.h
+++ b/compat.h
@@ -26,10 +26,14 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-/* RCSID("$Id: compat.h,v 1.3 1999/11/25 00:54:59 damien Exp $"); */
+/* RCSID("$Id: compat.h,v 1.4 2000/04/04 04:39:01 damien Exp $"); */
#ifndef COMPAT_H
#define COMPAT_H
void enable_compat13(void);
+void enable_compat20(void);
+void compat_datafellows(const char *s);
extern int compat13;
+extern int compat20;
+extern int datafellows;
#endif
diff --git a/dsa.c b/dsa.c
new file mode 100644
index 0000000..99d8cea
--- /dev/null
+++ b/dsa.c
@@ -0,0 +1,309 @@
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Markus Friedl.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$Id: dsa.c,v 1.1 2000/04/03 20:06:14 markus Exp $");
+
+#include "ssh.h"
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "compat.h"
+
+#if HAVE_OPENSSL
+# include <openssl/bn.h>
+# include <openssl/dh.h>
+# include <openssl/rsa.h>
+# include <openssl/dsa.h>
+# include <openssl/evp.h>
+# include <openssl/bio.h>
+# include <openssl/pem.h>
+#endif /* HAVE_OPENSSL */
+#if HAVE_SSL
+# include <ssl/bn.h>
+# include <ssl/dh.h>
+# include <ssl/rsa.h>
+# include <ssl/dsa.h>
+# include <ssl/evp.h>
+# include <ssl/bio.h>
+# include <ssl/pem.h>
+#endif /* HAVE_SSL */
+
+#include <ssl/hmac.h>
+#include "kex.h"
+#include "key.h"
+
+#define INTBLOB_LEN 20
+#define SIGBLOB_LEN (2*INTBLOB_LEN)
+
+Key *
+dsa_serverkey_from_blob(
+ char *serverhostkey, int serverhostkeylen)
+{
+ Buffer b;
+ char *ktype;
+ int rlen;
+ DSA *dsa;
+ Key *key;
+
+ /* fetch & parse DSA/DSS pubkey */
+ key = key_new(KEY_DSA);
+ dsa = key->dsa;
+ buffer_init(&b);
+ buffer_append(&b, serverhostkey, serverhostkeylen);
+ ktype = buffer_get_string(&b, NULL);
+ if (strcmp(KEX_DSS, ktype) != 0) {
+ log("dsa_serverkey_from_blob: cannot handle type %s", ktype);
+ key_free(key);
+ return NULL;
+ }
+ buffer_get_bignum2(&b, dsa->p);
+ buffer_get_bignum2(&b, dsa->q);
+ buffer_get_bignum2(&b, dsa->g);
+ buffer_get_bignum2(&b, dsa->pub_key);
+ rlen = buffer_len(&b);
+ if(rlen != 0)
+ log("dsa_serverkey_from_blob: remaining bytes in serverhostkey %d", rlen);
+ buffer_free(&b);
+
+ log("keytype %s", ktype);
+#ifdef DEBUG_DSS
+ DSA_print_fp(stderr, dsa, 8);
+#endif
+ return key;
+}
+DSA *
+dsa_load_private(char *filename)
+{
+ DSA *dsa;
+ BIO *in;
+
+ in = BIO_new(BIO_s_file());
+ if (in == NULL)
+ fatal("BIO_new failed");
+ if (BIO_read_filename(in, filename) <= 0)
+ fatal("BIO_read failed %s: %s", filename, strerror(errno));
+ fprintf(stderr, "read DSA private key\n");
+ dsa = PEM_read_bio_DSAPrivateKey(in,NULL,NULL,NULL);
+ if (dsa == NULL)
+ fatal("PEM_read_bio_DSAPrivateKey failed %s", filename);
+ BIO_free(in);
+ return dsa;
+}
+Key *
+dsa_get_serverkey(char *filename)
+{
+ Key *k = key_new(KEY_EMPTY);
+ k->type = KEY_DSA;
+ k->dsa = dsa_load_private(filename);
+#ifdef DEBUG_DSS
+ DSA_print_fp(stderr, dsa, 8);
+#endif
+ return k;
+}
+int
+dsa_make_serverkey_blob(Key *key, unsigned char **blobp, unsigned int *lenp)
+{
+ Buffer b;
+ int len;
+ unsigned char *buf;
+
+ if (key == NULL || key->type != KEY_DSA)
+ return 0;
+ buffer_init(&b);
+ buffer_put_cstring(&b, KEX_DSS);
+ buffer_put_bignum2(&b, key->dsa->p);
+ buffer_put_bignum2(&b, key->dsa->q);
+ buffer_put_bignum2(&b, key->dsa->g);
+ buffer_put_bignum2(&b, key->dsa->pub_key);
+ len = buffer_len(&b);
+ buf = xmalloc(len);
+ memcpy(buf, buffer_ptr(&b), len);
+ memset(buffer_ptr(&b), 0, len);
+ buffer_free(&b);
+ if (lenp != NULL)
+ *lenp = len;
+ if (blobp != NULL)
+ *blobp = buf;
+ return len;
+}
+int
+dsa_sign(
+ Key *key,
+ unsigned char **sigp, int *lenp,
+ unsigned char *hash, int hlen)
+{
+ unsigned char *digest;
+ unsigned char *ret;
+ DSA_SIG *sig;
+ EVP_MD *evp_md = EVP_sha1();
+ EVP_MD_CTX md;
+ unsigned int rlen;
+ unsigned int slen;
+ unsigned int len;
+ unsigned char sigblob[SIGBLOB_LEN];
+ Buffer b;
+
+ if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) {
+ log("dsa_sign: no DSA key");
+ return -1;
+ }
+ digest = xmalloc(evp_md->md_size);
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, hash, hlen);
+ EVP_DigestFinal(&md, digest, NULL);
+
+ sig = DSA_do_sign(digest, evp_md->md_size, key->dsa);
+
+ rlen = BN_num_bytes(sig->r);
+ slen = BN_num_bytes(sig->s);
+ if (rlen > INTBLOB_LEN || slen > INTBLOB_LEN) {
+ log("bad sig size %d %d", rlen, slen);
+ DSA_SIG_free(sig);
+ return -1;
+ }
+ log("sig size %d %d", rlen, slen);
+
+ memset(sigblob, 0, SIGBLOB_LEN);
+ BN_bn2bin(sig->r, sigblob+ SIGBLOB_LEN - INTBLOB_LEN - rlen);
+ BN_bn2bin(sig->s, sigblob+ SIGBLOB_LEN - slen);
+ DSA_SIG_free(sig);
+
+ if (datafellows) {
+ log("datafellows");
+ ret = xmalloc(SIGBLOB_LEN);
+ memcpy(ret, sigblob, SIGBLOB_LEN);
+ if (lenp != NULL)
+ *lenp = SIGBLOB_LEN;
+ if (sigp != NULL)
+ *sigp = ret;
+ } else {
+ /* ietf-drafts */
+ buffer_init(&b);
+ buffer_put_cstring(&b, KEX_DSS);
+ buffer_put_string(&b, sigblob, SIGBLOB_LEN);
+ len = buffer_len(&b);
+ ret = xmalloc(len);
+ memcpy(ret, buffer_ptr(&b), len);
+ buffer_free(&b);
+ if (lenp != NULL)
+ *lenp = len;
+ if (sigp != NULL)
+ *sigp = ret;
+ }
+ return 0;
+}
+int
+dsa_verify(
+ Key *key,
+ unsigned char *signature, int signaturelen,
+ unsigned char *hash, int hlen)
+{
+ Buffer b;
+ unsigned char *digest;
+ DSA_SIG *sig;
+ EVP_MD *evp_md = EVP_sha1();
+ EVP_MD_CTX md;
+ char *ktype;
+ unsigned char *sigblob;
+ char *txt;
+ unsigned int len;
+ int rlen;
+ int ret;
+
+ if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) {
+ log("dsa_verify: no DSA key");
+ return -1;
+ }
+
+ if (datafellows && signaturelen != SIGBLOB_LEN) {
+ log("heh? datafellows ssh2 complies with ietf-drafts????");
+ datafellows = 0;
+ }
+
+ log("len %d datafellows %d", signaturelen, datafellows);
+
+ /* fetch signature */
+ if (datafellows) {
+ sigblob = signature;
+ len = signaturelen;
+ } else {
+ /* ietf-drafts */
+ buffer_init(&b);
+ buffer_append(&b, (char *) signature, signaturelen);
+ ktype = buffer_get_string(&b, NULL);
+ sigblob = (unsigned char *)buffer_get_string(&b, &len);
+ rlen = buffer_len(&b);
+ if(rlen != 0)
+ log("remaining bytes in signature %d", rlen);
+ buffer_free(&b);
+ }
+
+ if (len != SIGBLOB_LEN) {
+ fatal("bad sigbloblen %d != SIGBLOB_LEN", len);
+ }
+
+ /* parse signature */
+ sig = DSA_SIG_new();
+ sig->r = BN_new();
+ sig->s = BN_new();
+ BN_bin2bn(sigblob, INTBLOB_LEN, sig->r);
+ BN_bin2bn(sigblob+ INTBLOB_LEN, INTBLOB_LEN, sig->s);
+ if (!datafellows) {
+ memset(sigblob, 0, len);
+ xfree(sigblob);
+ }
+
+ /* sha1 the signed data (== session_id == hash) */
+ digest = xmalloc(evp_md->md_size);
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, hash, hlen);
+ EVP_DigestFinal(&md, digest, NULL);
+
+ ret = DSA_do_verify(digest, evp_md->md_size, sig, key->dsa);
+
+ memset(digest, 0, evp_md->md_size);
+ xfree(digest);
+ DSA_SIG_free(sig);
+
+ switch (ret) {
+ case 1:
+ txt = "correct";
+ break;
+ case 0:
+ txt = "incorrect";
+ break;
+ case -1:
+ default:
+ txt = "error";
+ break;
+ }
+ log("dsa_verify: signature %s", txt);
+ return ret;
+}
diff --git a/dsa.h b/dsa.h
new file mode 100644
index 0000000..65e651d
--- /dev/null
+++ b/dsa.h
@@ -0,0 +1,20 @@
+#ifndef DSA_H
+#define DSA_H
+
+Key *dsa_serverkey_from_blob(char *serverhostkey, int serverhostkeylen);
+Key *dsa_get_serverkey(char *filename);
+int dsa_make_serverkey_blob(Key *key, unsigned char **blobp, unsigned int *lenp);
+
+int
+dsa_sign(
+ Key *key,
+ unsigned char **sigp, int *lenp,
+ unsigned char *hash, int hlen);
+
+int
+dsa_verify(
+ Key *key,
+ unsigned char *signature, int signaturelen,
+ unsigned char *hash, int hlen);
+
+#endif
diff --git a/hmac.c b/hmac.c
new file mode 100644
index 0000000..45037ef
--- /dev/null
+++ b/hmac.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Markus Friedl.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$Id: hmac.c,v 1.1 2000/04/03 20:06:15 markus Exp $");
+
+#include "xmalloc.h"
+#include "ssh.h"
+#include "getput.h"
+
+#if HAVE_OPENSSL
+# include <openssl/hmac.h>
+#endif /* HAVE_OPENSSL */
+#if HAVE_SSL
+# include <ssl/hmac.h>
+#endif /* HAVE_SSL */
+
+unsigned char *
+hmac(
+ EVP_MD *evp_md,
+ unsigned int seqno,
+ unsigned char *data, int datalen,
+ unsigned char *key, int keylen)
+{
+ HMAC_CTX c;
+ static unsigned char m[EVP_MAX_MD_SIZE];
+ unsigned char b[4];
+
+ if (key == NULL)
+ fatal("hmac: no key");
+ HMAC_Init(&c, key, keylen, evp_md);
+ PUT_32BIT(b, seqno);
+ HMAC_Update(&c, b, sizeof b);
+ HMAC_Update(&c, data, datalen);
+ HMAC_Final(&c, m, NULL);
+ HMAC_cleanup(&c);
+ return(m);
+}
diff --git a/hmac.h b/hmac.h
new file mode 100644
index 0000000..fb68029
--- /dev/null
+++ b/hmac.h
@@ -0,0 +1,11 @@
+#ifndef HMAC_H
+#define HMAC_H
+
+unsigned char *
+hmac(
+ EVP_MD *evp_md,
+ unsigned int seqno,
+ unsigned char *data, int datalen,
+ unsigned char *key, int len);
+
+#endif
diff --git a/kex.c b/kex.c
new file mode 100644
index 0000000..e730536
--- /dev/null
+++ b/kex.c
@@ -0,0 +1,407 @@
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Markus Friedl.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$Id: kex.c,v 1.1 2000/04/04 04:39:02 damien Exp $");
+
+#include "ssh.h"
+#include "ssh2.h"
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "cipher.h"
+#include "compat.h"
+
+#if HAVE_OPENSSL
+# include <openssl/bn.h>
+# include <openssl/dh.h>
+# include <openssl/crypto.h>
+# include <openssl/bio.h>
+# include <openssl/bn.h>
+# include <openssl/dh.h>
+# include <openssl/pem.h>
+#endif /* HAVE_OPENSSL */
+#if HAVE_SSL
+# include <ssl/bn.h>
+# include <ssl/dh.h>
+# include <ssl/crypto.h>
+# include <ssl/bio.h>
+# include <ssl/bn.h>
+# include <ssl/dh.h>
+# include <ssl/pem.h>
+#endif /* HAVE_SSL */
+
+#include "entropy.h"
+#include "kex.h"
+
+Buffer *
+kex_init(char *myproposal[PROPOSAL_MAX])
+{
+ char c = 0;
+ unsigned char cookie[16];
+ u_int32_t rand = 0;
+ int i;
+ Buffer *ki = xmalloc(sizeof(*ki));
+ for (i = 0; i < 16; i++) {
+ if (i % 4 == 0)
+ rand = arc4random();
+ cookie[i] = rand & 0xff;
+ rand >>= 8;
+ }
+ buffer_init(ki);
+ buffer_append(ki, (char *)cookie, sizeof cookie);
+ for (i = 0; i < PROPOSAL_MAX; i++)
+ buffer_put_cstring(ki, myproposal[i]);
+ buffer_append(ki, &c, 1); /* boolean first_kex_packet_follows */
+ buffer_put_int(ki, 0); /* uint32 0 (reserved for future extension) */
+ return ki;
+}
+
+/* diffie-hellman-group1-sha1 */
+
+DH *
+new_dh_group1()
+{
+ static char *group1 =
+ "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
+ "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
+ "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
+ "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
+ "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381"
+ "FFFFFFFF" "FFFFFFFF";
+ DH *dh;
+ int ret;
+ dh = DH_new();
+ if(dh == NULL)
+ fatal("DH_new");
+ ret = BN_hex2bn(&dh->p,group1);
+ if(ret<0)
+ fatal("BN_hex2bn");
+ dh->g = BN_new();
+ if(dh->g == NULL)
+ fatal("DH_new g");
+ BN_set_word(dh->g,2);
+
+ seed_rng();
+ if (DH_generate_key(dh) == 0)
+ fatal("DH_generate_key");
+ seed_rng();
+
+ return dh;
+}
+
+void
+bignum_print(BIGNUM *b)
+{
+ BN_print_fp(stderr,b);
+}
+
+void
+dump_digest(unsigned char *digest, int len)
+{
+ int i;
+ for (i = 0; i< len; i++){
+ fprintf(stderr, "%02x", digest[i]);
+ if(i%2!=0)
+ fprintf(stderr, " ");
+ }
+ fprintf(stderr, "\n");
+}
+
+unsigned char *
+kex_hash(
+ char *client_version_string,
+ char *server_version_string,
+ char *ckexinit, int ckexinitlen,
+ char *skexinit, int skexinitlen,
+ char *serverhostkeyblob, int sbloblen,
+ BIGNUM *client_dh_pub,
+ BIGNUM *server_dh_pub,
+ BIGNUM *shared_secret)
+{
+ Buffer b;
+ static unsigned char digest[EVP_MAX_MD_SIZE];
+ EVP_MD *evp_md = EVP_sha1();
+ EVP_MD_CTX md;
+
+ buffer_init(&b);
+ buffer_put_string(&b, client_version_string, strlen(client_version_string));
+ buffer_put_string(&b, server_version_string, strlen(server_version_string));
+
+ /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+ buffer_put_int(&b, ckexinitlen+1);
+ buffer_put_char(&b, SSH2_MSG_KEXINIT);
+ buffer_append(&b, ckexinit, ckexinitlen);
+ buffer_put_int(&b, skexinitlen+1);
+ buffer_put_char(&b, SSH2_MSG_KEXINIT);
+ buffer_append(&b, skexinit, skexinitlen);
+
+ buffer_put_string(&b, serverhostkeyblob, sbloblen);
+ buffer_put_bignum2(&b, client_dh_pub);
+ buffer_put_bignum2(&b, server_dh_pub);
+ buffer_put_bignum2(&b, shared_secret);
+
+#ifdef DEBUG_KEX
+ buffer_dump(&b);
+#endif
+
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
+ EVP_DigestFinal(&md, digest, NULL);
+
+ buffer_free(&b);
+
+#ifdef DEBUG_KEX
+ dump_digest(digest, evp_md->md_size);
+#endif
+ return digest;
+}
+
+unsigned char *
+derive_key(int id, int need, char unsigned *hash, BIGNUM *shared_secret)
+{
+ Buffer b;
+ EVP_MD *evp_md = EVP_sha1();
+ EVP_MD_CTX md;
+ char c = id;
+ int have;
+ int mdsz = evp_md->md_size;
+ unsigned char *digest = xmalloc(((need+mdsz-1)/mdsz)*mdsz);
+
+ buffer_init(&b);
+ buffer_put_bignum2(&b, shared_secret);
+
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); /* shared_secret K */
+ EVP_DigestUpdate(&md, hash, mdsz); /* transport-06 */
+ EVP_DigestUpdate(&md, &c, 1); /* key id */
+ EVP_DigestUpdate(&md, hash, mdsz); /* session id */
+ EVP_DigestFinal(&md, digest, NULL);
+
+ /* expand */
+ for (have = mdsz; need > have; have += mdsz) {
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
+ EVP_DigestUpdate(&md, hash, mdsz);
+ EVP_DigestUpdate(&md, digest, have);
+ EVP_DigestFinal(&md, digest + have, NULL);
+ }
+ buffer_free(&b);
+#ifdef DEBUG_KEX
+ fprintf(stderr, "Digest '%c'== ", c);
+ dump_digest(digest, need);
+#endif
+ return digest;
+}
+
+#define NKEYS 6
+
+#define MAX_PROP 20
+#define SEP ","
+
+char *
+get_match(char *client, char *server)
+{
+ char *sproposals[MAX_PROP];
+ char *p;
+ int i, j, nproposals;
+
+ for ((p = strtok(server, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+ if (i < MAX_PROP)
+ sproposals[i] = p;
+ else
+ break;
+ }
+ nproposals = i;
+
+ for ((p = strtok(client, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+ for (j = 0; j < nproposals; j++)
+ if (strcmp(p, sproposals[j]) == 0)
+ return xstrdup(p);
+ }
+ return NULL;
+}
+void
+choose_enc(Enc *enc, char *client, char *server)
+{
+ char *name = get_match(client, server);
+ if (name == NULL)
+ fatal("no matching cipher found: client %s server %s", client, server);
+ enc->type = cipher_number(name);
+
+ switch (enc->type) {
+ case SSH_CIPHER_3DES_CBC:
+ enc->key_len = 24;
+ enc->iv_len = 8;
+ enc->block_size = 8;
+ break;
+ case SSH_CIPHER_BLOWFISH_CBC:
+ case SSH_CIPHER_CAST128_CBC:
+ enc->key_len = 16;
+ enc->iv_len = 8;
+ enc->block_size = 8;
+ break;
+ case SSH_CIPHER_ARCFOUR:
+ enc->key_len = 16;
+ enc->iv_len = 0;
+ enc->block_size = 8;
+ break;
+ default:
+ fatal("unsupported cipher %s", name);
+ }
+ enc->name = name;
+ enc->enabled = 0;
+ enc->iv = NULL;
+ enc->key = NULL;
+}
+void
+choose_mac(Mac *mac, char *client, char *server)
+{
+ char *name = get_match(client, server);
+ if (name == NULL)
+ fatal("no matching mac found: client %s server %s", client, server);
+ if (strcmp(name, "hmac-md5") == 0) {
+ mac->md = EVP_md5();
+ } else if (strcmp(name, "hmac-sha1") == 0) {
+ mac->md = EVP_sha1();
+ } else if (strcmp(name, "hmac-ripemd160@openssh.com") == 0) {
+ mac->md = EVP_ripemd160();
+ } else {
+ fatal("unsupported mac %s", name);
+ }
+ mac->name = name;
+ mac->mac_len = mac->md->md_size;
+ mac->key_len = datafellows ? 16 : mac->mac_len;
+ mac->key = NULL;
+ mac->enabled = 0;
+}
+void
+choose_comp(Comp *comp, char *client, char *server)
+{
+ char *name = get_match(client, server);
+ if (name == NULL)
+ fatal("no matching comp found: client %s server %s", client, server);
+ if (strcmp(name, "zlib") == 0) {
+ comp->type = 1;
+ } else if (strcmp(name, "none") == 0) {
+ comp->type = 0;
+ } else {
+ fatal("unsupported comp %s", name);
+ }
+ comp->name = name;
+}
+void
+choose_kex(Kex *k, char *client, char *server)
+{
+ k->name = get_match(client, server);
+ if (k->name == NULL)
+ fatal("no kex alg");
+ if (strcmp(k->name, KEX_DH1) != 0)
+ fatal("bad kex alg %s", k->name);
+}
+void
+choose_hostkeyalg(Kex *k, char *client, char *server)
+{
+ k->hostkeyalg = get_match(client, server);
+ if (k->hostkeyalg == NULL)
+ fatal("no hostkey alg");
+ if (strcmp(k->hostkeyalg, KEX_DSS) != 0)
+ fatal("bad hostkey alg %s", k->hostkeyalg);
+}
+
+Kex *
+kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server)
+{
+ int i;
+ int mode;
+ int ctos; /* direction: if true client-to-server */
+ int need;
+ Kex *k;
+
+ k = xmalloc(sizeof(*k));
+ memset(k, 0, sizeof(*k));
+ k->server = server;
+
+ for (mode = 0; mode < MODE_MAX; mode++) {
+ int nenc, nmac, ncomp;
+ ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN);
+ nenc = ctos ? PROPOSAL_ENC_ALGS_CTOS : PROPOSAL_ENC_ALGS_STOC;
+ nmac = ctos ? PROPOSAL_MAC_ALGS_CTOS : PROPOSAL_MAC_ALGS_STOC;
+ ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC;
+ choose_enc (&k->enc [mode], cprop[nenc], sprop[nenc]);
+ choose_mac (&k->mac [mode], cprop[nmac], sprop[nmac]);
+ choose_comp(&k->comp[mode], cprop[ncomp], sprop[ncomp]);
+ log("kex: %s %s %s %s",
+ ctos ? "client->server" : "server->client",
+ k->enc[mode].name,
+ k->mac[mode].name,
+ k->comp[mode].name);
+ }
+ choose_kex(k, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]);
+ choose_hostkeyalg(k, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
+ sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]);
+ for (i = 0; i < PROPOSAL_MAX; i++) {
+ xfree(cprop[i]);
+ xfree(sprop[i]);
+ }
+ need = 0;
+ for (mode = 0; mode < MODE_MAX; mode++) {
+ if (need < k->enc[mode].key_len)
+ need = k->enc[mode].key_len;
+ if (need < k->enc[mode].iv_len)
+ need = k->enc[mode].iv_len;
+ if (need < k->mac[mode].key_len)
+ need = k->mac[mode].key_len;
+ }
+ /* need runden? */
+#define WE_NEED 32
+ k->we_need = WE_NEED;
+ k->we_need = need;
+ return k;
+}
+
+int
+kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret)
+{
+ int i;
+ int mode;
+ int ctos;
+ unsigned char *keys[NKEYS];
+
+ for (i = 0; i < NKEYS; i++)
+ keys[i] = derive_key('A'+i, k->we_need, hash, shared_secret);
+
+ for (mode = 0; mode < MODE_MAX; mode++) {
+ ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN);
+ k->enc[mode].iv = keys[ctos ? 0 : 1];
+ k->enc[mode].key = keys[ctos ? 2 : 3];
+ k->mac[mode].key = keys[ctos ? 4 : 5];
+ }
+ return 0;
+}
diff --git a/kex.h b/kex.h
new file mode 100644
index 0000000..f9e7999
--- /dev/null
+++ b/kex.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Markus Friedl.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef KEX_H
+#define KEX_H
+
+#define KEX_DH1 "diffie-hellman-group1-sha1"
+#define KEX_DSS "ssh-dss"
+
+enum kex_init_proposals {
+ PROPOSAL_KEX_ALGS,
+ PROPOSAL_SERVER_HOST_KEY_ALGS,
+ PROPOSAL_ENC_ALGS_CTOS,
+ PROPOSAL_ENC_ALGS_STOC,
+ PROPOSAL_MAC_ALGS_CTOS,
+ PROPOSAL_MAC_ALGS_STOC,
+ PROPOSAL_COMP_ALGS_CTOS,
+ PROPOSAL_COMP_ALGS_STOC,
+ PROPOSAL_LANG_CTOS,
+ PROPOSAL_LANG_STOC,
+ PROPOSAL_MAX
+};
+
+enum kex_modes {
+ MODE_IN,
+ MODE_OUT,
+ MODE_MAX
+};
+
+typedef struct Kex Kex;
+typedef struct Mac Mac;
+typedef struct Comp Comp;
+typedef struct Enc Enc;
+
+struct Enc {
+ int type;
+ int enabled;
+ int block_size;
+ unsigned char *key;
+ unsigned char *iv;
+ int key_len;
+ int iv_len;
+ char *name;
+};
+struct Mac {
+ EVP_MD *md;
+ int enabled;
+ int mac_len;
+ unsigned char *key;
+ int key_len;
+ char *name;
+};
+struct Comp {
+ int type;
+ int enabled;
+ char *name;
+};
+struct Kex {
+ Enc enc [MODE_MAX];
+ Mac mac [MODE_MAX];
+ Comp comp[MODE_MAX];
+ int we_need;
+ int server;
+ char *name;
+ char *hostkeyalg;
+};
+
+Buffer *kex_init(char *myproposal[PROPOSAL_MAX]);
+DH *new_dh_group1();
+Kex *kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server);
+int kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret);
+void bignum_print(BIGNUM *b);
+void packet_set_kex(Kex *k);
+
+unsigned char *
+kex_hash(
+ char *client_version_string,
+ char *server_version_string,
+ char *ckexinit, int ckexinitlen,
+ char *skexinit, int skexinitlen,
+ char *serverhostkeyblob, int sbloblen,
+ BIGNUM *client_dh_pub,
+ BIGNUM *server_dh_pub,
+ BIGNUM *shared_secret);
+
+#endif
diff --git a/nchan.c b/nchan.c
index 996623f..3795d8a 100644
--- a/nchan.c
+++ b/nchan.c
@@ -28,7 +28,7 @@
*/
#include "includes.h"
-RCSID("$Id: nchan.c,v 1.6 2000/04/01 01:09:24 damien Exp $");
+RCSID("$Id: nchan.c,v 1.7 2000/04/04 04:39:02 damien Exp $");
#include "ssh.h"
@@ -37,138 +37,169 @@
#include "channels.h"
#include "nchan.h"
-static void chan_send_ieof(Channel *c);
-static void chan_send_oclose(Channel *c);
-static void chan_shutdown_write(Channel *c);
-static void chan_shutdown_read(Channel *c);
+#include "ssh2.h"
+#include "compat.h"
+/* functions manipulating channel states */
/*
* EVENTS update channel input/output states execute ACTIONS
*/
-
/* events concerning the INPUT from socket for channel (istate) */
-void
-chan_rcvd_oclose(Channel *c)
+chan_event_fn *chan_rcvd_oclose = NULL;
+chan_event_fn *chan_read_failed = NULL;
+chan_event_fn *chan_ibuf_empty = NULL;
+/* events concerning the OUTPUT from channel for socket (ostate) */
+chan_event_fn *chan_rcvd_ieof = NULL;
+chan_event_fn *chan_write_failed = NULL;
+chan_event_fn *chan_obuf_empty = NULL;
+/*
+ * ACTIONS: should never update the channel states
+ */
+static void chan_send_ieof1(Channel *c);
+static void chan_send_oclose1(Channel *c);
+static void chan_send_close2(Channel *c);
+static void chan_send_eof2(Channel *c);
+
+/* channel cleanup */
+chan_event_fn *chan_delete_if_full_closed = NULL;
+
+/* helper */
+static void chan_shutdown_write(Channel *c);
+static void chan_shutdown_read(Channel *c);
+
+/*
+ * SSH1 specific implementation of event functions
+ */
+
+static void
+chan_rcvd_oclose1(Channel *c)
{
+ debug("channel %d: rcvd oclose", c->self);
switch (c->istate) {
case CHAN_INPUT_WAIT_OCLOSE:
- debug("channel %d: INPUT_WAIT_OCLOSE -> INPUT_CLOSED [rcvd OCLOSE]", c->self);
+ debug("channel %d: input wait_oclose -> closed", c->self);
c->istate = CHAN_INPUT_CLOSED;
break;
case CHAN_INPUT_OPEN:
- debug("channel %d: INPUT_OPEN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
+ debug("channel %d: input open -> closed", c->self);
chan_shutdown_read(c);
- chan_send_ieof(c);
+ chan_send_ieof1(c);
c->istate = CHAN_INPUT_CLOSED;
break;
case CHAN_INPUT_WAIT_DRAIN:
/* both local read_failed and remote write_failed */
- log("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
- debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
- chan_send_ieof(c);
+ log("channel %d: input drain -> closed", c->self);
+ chan_send_ieof1(c);
c->istate = CHAN_INPUT_CLOSED;
break;
default:
- error("protocol error: chan_rcvd_oclose %d for istate %d", c->self, c->istate);
+ error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
+ c->self, c->istate);
return;
}
}
-void
-chan_read_failed(Channel *c)
+static void
+chan_read_failed_12(Channel *c)
{
+ debug("channel %d: read failed", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
- debug("channel %d: INPUT_OPEN -> INPUT_WAIT_DRAIN [read failed]", c->self);
+ debug("channel %d: input open -> drain", c->self);
chan_shutdown_read(c);
c->istate = CHAN_INPUT_WAIT_DRAIN;
break;
default:
- error("internal error: we do not read, but chan_read_failed %d for istate %d",
- c->self, c->istate);
+ error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
+ c->self, c->istate);
break;
}
}
-void
-chan_ibuf_empty(Channel *c)
+static void
+chan_ibuf_empty1(Channel *c)
{
+ debug("channel %d: ibuf empty", c->self);
if (buffer_len(&c->input)) {
- error("internal error: chan_ibuf_empty %d for non empty buffer", c->self);
+ error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
+ c->self);
return;
}
switch (c->istate) {
case CHAN_INPUT_WAIT_DRAIN:
- debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_WAIT_OCLOSE [inbuf empty, send IEOF]", c->self);
- chan_send_ieof(c);
+ debug("channel %d: input drain -> wait_oclose", c->self);
+ chan_send_ieof1(c);
c->istate = CHAN_INPUT_WAIT_OCLOSE;
break;
default:
- error("internal error: chan_ibuf_empty %d for istate %d", c->self, c->istate);
+ error("channel %d: internal error: chan_ibuf_empty for istate %d",
+ c->self, c->istate);
break;
}
}
-
-/* events concerning the OUTPUT from channel for socket (ostate) */
-void
-chan_rcvd_ieof(Channel *c)
+static void
+chan_rcvd_ieof1(Channel *c)
{
+ debug("channel %d: rcvd ieof", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
- debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_DRAIN [rvcd IEOF]", c->self);
+ debug("channel %d: output open -> drain", c->self);
c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
break;
case CHAN_OUTPUT_WAIT_IEOF:
- debug("channel %d: OUTPUT_WAIT_IEOF -> OUTPUT_CLOSED [rvcd IEOF]", c->self);
+ debug("channel %d: output wait_ieof -> closed", c->self);
c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
- error("protocol error: chan_rcvd_ieof %d for ostate %d", c->self, c->ostate);
+ error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
+ c->self, c->ostate);
break;
}
}
-void
-chan_write_failed(Channel *c)
+static void
+chan_write_failed1(Channel *c)
{
+ debug("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
- debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_IEOF [write failed]", c->self);
- chan_send_oclose(c);
+ debug("channel %d: output open -> wait_ieof", c->self);
+ chan_send_oclose1(c);
c->ostate = CHAN_OUTPUT_WAIT_IEOF;
break;
case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [write failed]", c->self);
- chan_send_oclose(c);
+ debug("channel %d: output wait_drain -> closed", c->self);
+ chan_send_oclose1(c);
c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
- error("internal error: chan_write_failed %d for ostate %d", c->self, c->ostate);
+ error("channel %d: internal error: chan_write_failed for ostate %d",
+ c->self, c->ostate);
break;
}
}
-void
-chan_obuf_empty(Channel *c)
+static void
+chan_obuf_empty1(Channel *c)
{
+ debug("channel %d: obuf empty", c->self);
if (buffer_len(&c->output)) {
- debug("internal error: chan_obuf_empty %d for non empty buffer", c->self);
+ error("channel %d: internal error: chan_obuf_empty for non empty buffer",
+ c->self);
return;
}
switch (c->ostate) {
case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [obuf empty, send OCLOSE]", c->self);
- chan_send_oclose(c);
+ debug("channel %d: output drain -> closed", c->self);
+ chan_send_oclose1(c);
c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
- error("internal error: chan_obuf_empty %d for ostate %d", c->self, c->ostate);
+ error("channel %d: internal error: chan_obuf_empty for ostate %d",
+ c->self, c->ostate);
break;
}
}
-
-/*
- * ACTIONS: should never update the channel states: c->istate or c->ostate
- */
static void
-chan_send_ieof(Channel *c)
+chan_send_ieof1(Channel *c)
{
+ debug("channel %d: send ieof", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
case CHAN_INPUT_WAIT_DRAIN:
@@ -177,13 +208,15 @@
packet_send();
break;
default:
- error("internal error: channel %d: cannot send IEOF for istate %d", c->self, c->istate);
+ error("channel %d: internal error: cannot send ieof for istate %d",
+ c->self, c->istate);
break;
}
}
static void
-chan_send_oclose(Channel *c)
+chan_send_oclose1(Channel *c)
{
+ debug("channel %d: send oclose", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
@@ -194,40 +227,246 @@
packet_send();
break;
default:
- error("internal error: channel %d: cannot send OCLOSE for ostate %d", c->self, c->istate);
+ error("channel %d: internal error: cannot send oclose for ostate %d",
+ c->self, c->ostate);
break;
}
}
+static void
+chan_delete_if_full_closed1(Channel *c)
+{
+ if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
+ debug("channel %d: full closed", c->self);
+ channel_free(c->self);
+ }
+}
+
+/*
+ * the same for SSH2
+ */
+static void
+chan_rcvd_oclose2(Channel *c)
+{
+ debug("channel %d: rcvd close", c->self);
+ if (c->flags & CHAN_CLOSE_RCVD)
+ error("channel %d: protocol error: close rcvd twice", c->self);
+ c->flags |= CHAN_CLOSE_RCVD;
+ if (c->type == SSH_CHANNEL_LARVAL) {
+ /* tear down larval channels immediately */
+ c->ostate = CHAN_OUTPUT_CLOSED;
+ c->istate = CHAN_INPUT_CLOSED;
+ return;
+ }
+ switch (c->ostate) {
+ case CHAN_OUTPUT_OPEN:
+ /* wait until a data from the channel is consumed if a CLOSE is received */
+ debug("channel %d: output open -> drain", c->self);
+ c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
+ break;
+ }
+ switch (c->istate) {
+ case CHAN_INPUT_OPEN:
+ debug("channel %d: input open -> closed", c->self);
+ chan_shutdown_read(c);
+ break;
+ case CHAN_INPUT_WAIT_DRAIN:
+ debug("channel %d: input drain -> closed", c->self);
+ chan_send_eof2(c);
+ break;
+ }
+ c->istate = CHAN_INPUT_CLOSED;
+}
+static void
+chan_ibuf_empty2(Channel *c)
+{
+ debug("channel %d: ibuf empty", c->self);
+ if (buffer_len(&c->input)) {
+ error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
+ c->self);
+ return;
+ }
+ switch (c->istate) {
+ case CHAN_INPUT_WAIT_DRAIN:
+ debug("channel %d: input drain -> closed", c->self);
+ if (!(c->flags & CHAN_CLOSE_SENT))
+ chan_send_eof2(c);
+ c->istate = CHAN_INPUT_CLOSED;
+ break;
+ default:
+ error("channel %d: internal error: chan_ibuf_empty for istate %d",
+ c->self, c->istate);
+ break;
+ }
+}
+static void
+chan_rcvd_ieof2(Channel *c)
+{
+ debug("channel %d: rcvd eof", c->self);
+ if (c->ostate == CHAN_OUTPUT_OPEN) {
+ debug("channel %d: output open -> drain", c->self);
+ c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
+ }
+}
+static void
+chan_write_failed2(Channel *c)
+{
+ debug("channel %d: write failed", c->self);
+ switch (c->ostate) {
+ case CHAN_OUTPUT_OPEN:
+ debug("channel %d: output open -> closed", c->self);
+ chan_shutdown_write(c); // ??
+ c->ostate = CHAN_OUTPUT_CLOSED;
+ break;
+ case CHAN_OUTPUT_WAIT_DRAIN:
+ debug("channel %d: output drain -> closed", c->self);
+ chan_shutdown_write(c);
+ c->ostate = CHAN_OUTPUT_CLOSED;
+ break;
+ default:
+ error("channel %d: internal error: chan_write_failed for ostate %d",
+ c->self, c->ostate);
+ break;
+ }
+}
+static void
+chan_obuf_empty2(Channel *c)
+{
+ debug("channel %d: obuf empty", c->self);
+ if (buffer_len(&c->output)) {
+ error("internal error: chan_obuf_empty %d for non empty buffer",
+ c->self);
+ return;
+ }
+ switch (c->ostate) {
+ case CHAN_OUTPUT_WAIT_DRAIN:
+ debug("channel %d: output drain -> closed", c->self);
+ chan_shutdown_write(c);
+ c->ostate = CHAN_OUTPUT_CLOSED;
+ break;
+ default:
+ error("channel %d: internal error: chan_obuf_empty for ostate %d",
+ c->self, c->ostate);
+ break;
+ }
+}
+static void
+chan_send_eof2(Channel *c)
+{
+ debug("channel %d: send eof", c->self);
+ switch (c->istate) {
+ case CHAN_INPUT_WAIT_DRAIN:
+ packet_start(SSH2_MSG_CHANNEL_EOF);
+ packet_put_int(c->remote_id);
+ packet_send();
+ break;
+ default:
+ error("channel %d: internal error: cannot send eof for istate %d",
+ c->self, c->istate);
+ break;
+ }
+}
+static void
+chan_send_close2(Channel *c)
+{
+ debug("channel %d: send close", c->self);
+ if (c->ostate != CHAN_OUTPUT_CLOSED ||
+ c->istate != CHAN_INPUT_CLOSED) {
+ error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
+ c->self, c->istate, c->ostate);
+ } else if (c->flags & CHAN_CLOSE_SENT) {
+ error("channel %d: internal error: already sent close", c->self);
+ } else {
+ packet_start(SSH2_MSG_CHANNEL_CLOSE);
+ packet_put_int(c->remote_id);
+ packet_send();
+ c->flags |= CHAN_CLOSE_SENT;
+ }
+}
+static void
+chan_delete_if_full_closed2(Channel *c)
+{
+ if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
+ if (!(c->flags & CHAN_CLOSE_SENT)) {
+ chan_send_close2(c);
+ }
+ if ((c->flags & CHAN_CLOSE_SENT) &&
+ (c->flags & CHAN_CLOSE_RCVD)) {
+ debug("channel %d: full closed2", c->self);
+ channel_free(c->self);
+ }
+ }
+}
+
+/* shared */
+void
+chan_init_iostates(Channel *c)
+{
+ c->ostate = CHAN_OUTPUT_OPEN;
+ c->istate = CHAN_INPUT_OPEN;
+ c->flags = 0;
+}
+
+/* init */
+void
+chan_init(void)
+{
+ if (compat20) {
+ chan_rcvd_oclose = chan_rcvd_oclose2;
+ chan_read_failed = chan_read_failed_12;
+ chan_ibuf_empty = chan_ibuf_empty2;
+
+ chan_rcvd_ieof = chan_rcvd_ieof2;
+ chan_write_failed = chan_write_failed2;
+ chan_obuf_empty = chan_obuf_empty2;
+
+ chan_delete_if_full_closed = chan_delete_if_full_closed2;
+ } else {
+ chan_rcvd_oclose = chan_rcvd_oclose1;
+ chan_read_failed = chan_read_failed_12;
+ chan_ibuf_empty = chan_ibuf_empty1;
+
+ chan_rcvd_ieof = chan_rcvd_ieof1;
+ chan_write_failed = chan_write_failed1;
+ chan_obuf_empty = chan_obuf_empty1;
+
+ chan_delete_if_full_closed = chan_delete_if_full_closed1;
+ }
+}
/* helper */
static void
chan_shutdown_write(Channel *c)
{
+ buffer_consume(&c->output, buffer_len(&c->output));
+ if (compat20 && c->type == SSH_CHANNEL_LARVAL)
+ return;
/* shutdown failure is allowed if write failed already */
- debug("channel %d: shutdown_write", c->self);
- if (shutdown(c->sock, SHUT_WR) < 0)
- debug("chan_shutdown_write failed for #%d/fd%d: %.100s",
- c->self, c->sock, strerror(errno));
+ debug("channel %d: close_write", c->self);
+ if (c->sock != -1) {
+ if (shutdown(c->sock, SHUT_WR) < 0)
+ debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
+ c->self, c->sock, strerror(errno));
+ } else {
+ if (close(c->wfd) < 0)
+ log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
+ c->self, c->wfd, strerror(errno));
+ c->wfd = -1;
+ }
}
static void
chan_shutdown_read(Channel *c)
{
- debug("channel %d: shutdown_read", c->self);
- if (shutdown(c->sock, SHUT_RD) < 0)
- error("chan_shutdown_read failed for #%d/fd%d [i%d o%d]: %.100s",
- c->self, c->sock, c->istate, c->ostate, strerror(errno));
-}
-void
-chan_delete_if_full_closed(Channel *c)
-{
- if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
- debug("channel %d: full closed", c->self);
- channel_free(c->self);
+ if (compat20 && c->type == SSH_CHANNEL_LARVAL)
+ return;
+ debug("channel %d: close_read", c->self);
+ if (c->sock != -1) {
+ if (shutdown(c->sock, SHUT_RD) < 0)
+ error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
+ c->self, c->sock, c->istate, c->ostate, strerror(errno));
+ } else {
+ if (close(c->rfd) < 0)
+ log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
+ c->self, c->rfd, strerror(errno));
+ c->rfd = -1;
}
}
-void
-chan_init_iostates(Channel *c)
-{
- c->ostate = CHAN_OUTPUT_OPEN;
- c->istate = CHAN_INPUT_OPEN;
-}
diff --git a/nchan.h b/nchan.h
index 0ceee1c..ae2b706 100644
--- a/nchan.h
+++ b/nchan.h
@@ -27,7 +27,7 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-/* RCSID("$Id: nchan.h,v 1.4 2000/04/01 01:09:24 damien Exp $"); */
+/* RCSID("$Id: nchan.h,v 1.5 2000/04/04 04:39:02 damien Exp $"); */
#ifndef NCHAN_H
#define NCHAN_H
@@ -72,17 +72,25 @@
#define CHAN_OUTPUT_WAIT_IEOF 0x40
#define CHAN_OUTPUT_CLOSED 0x80
-/* EVENTS for the input state */
-void chan_rcvd_oclose(Channel * c);
-void chan_read_failed(Channel * c);
-void chan_ibuf_empty(Channel * c);
+#define CHAN_CLOSE_SENT 0x01
+#define CHAN_CLOSE_RCVD 0x02
-/* EVENTS for the output state */
-void chan_rcvd_ieof(Channel * c);
-void chan_write_failed(Channel * c);
-void chan_obuf_empty(Channel * c);
+
+/* Channel EVENTS */
+typedef void chan_event_fn(Channel * c);
+
+/* for the input state */
+extern chan_event_fn *chan_rcvd_oclose;
+extern chan_event_fn *chan_read_failed;
+extern chan_event_fn *chan_ibuf_empty;
+
+/* for the output state */
+extern chan_event_fn *chan_rcvd_ieof;
+extern chan_event_fn *chan_write_failed;
+extern chan_event_fn *chan_obuf_empty;
+
+extern chan_event_fn *chan_delete_if_full_closed;
void chan_init_iostates(Channel * c);
-
-void chan_delete_if_full_closed(Channel *c);
+void chan_init(void);
#endif
diff --git a/nchan2.ms b/nchan2.ms
new file mode 100644
index 0000000..1b119d1
--- /dev/null
+++ b/nchan2.ms
@@ -0,0 +1,64 @@
+.TL
+OpenSSH Channel Close Protocol 2.0 Implementation
+.SH
+Channel Input State Diagram
+.PS
+reset
+l=1
+s=1.2
+ellipsewid=s*ellipsewid
+boxwid=s*boxwid
+ellipseht=s*ellipseht
+S1: ellipse "INPUT" "OPEN"
+move right 2*l from last ellipse.e
+S3: ellipse invis
+move down l from last ellipse.s
+S4: ellipse "INPUT" "CLOSED"
+move down l from 1st ellipse.s
+S2: ellipse "INPUT" "WAIT" "DRAIN"
+arrow from S1.e to S4.n
+box invis "rcvd CLOSE/" "shutdown_read" with .sw at last arrow.c
+arrow "ibuf_empty ||" "rcvd CLOSE/" "send EOF" "" from S2.e to S4.w
+arrow from S1.s to S2.n
+box invis "read_failed/" "shutdown_read" with .e at last arrow.c
+ellipse wid .9*ellipsewid ht .9*ellipseht at S4
+arrow "start" "" from S1.w+(-0.5,0) to S1.w
+.PE
+.SH
+Channel Output State Diagram
+.PS
+S1: ellipse "OUTPUT" "OPEN"
+move right 2*l from last ellipse.e
+S3: ellipse invis
+move down l from last ellipse.s
+S4: ellipse "OUTPUT" "CLOSED"
+move down l from 1st ellipse.s
+S2: ellipse "OUTPUT" "WAIT" "DRAIN"
+arrow from S1.e to S4.n
+box invis "write_failed/" "shutdown_write" with .sw at last arrow.c
+arrow "obuf_empty ||" "write_failed/" "shutdown_write" "" from S2.e to S4.w
+arrow from S1.s to S2.n
+box invis "rcvd EOF ||" "rcvd CLOSE/" "-" with .e at last arrow.c
+ellipse wid .9*ellipsewid ht .9*ellipseht at S4
+arrow "start" "" from S1.w+(-0.5,0) to S1.w
+.PE
+.SH
+Notes
+.PP
+The input buffer is filled with data from the socket
+(the socket represents the local consumer/producer of the
+forwarded channel).
+The data is then sent over the INPUT-end (transmit-end) of the channel to the
+remote peer.
+Data sent by the peer is received on the OUTPUT-end (receive-end),
+saved in the output buffer and written to the socket.
+.PP
+If the local protocol instance has forwarded all data on the
+INPUT-end of the channel, it sends an EOF message to the peer.
+.PP
+A CLOSE message is sent to the peer if
+both the INPUT- and the OUTOUT-half of the local
+end of the channel are closed.
+.PP
+The channel can be deallocated by a protocol instance
+if a CLOSE message he been both sent and received.
diff --git a/packet.c b/packet.c
index ffce2c7..3875d8f 100644
--- a/packet.c
+++ b/packet.c
@@ -11,11 +11,13 @@
*
* This file contains code implementing the packet protocol and communication
* with the other side. This same code is used both on client and server side.
- *
+ *
+ * SSH2 packet format added by Markus Friedl.
+ *
*/
#include "includes.h"
-RCSID("$Id: packet.c,v 1.13 2000/04/01 01:09:25 damien Exp $");
+RCSID("$Id: packet.c,v 1.14 2000/04/04 04:39:03 damien Exp $");
#include "xmalloc.h"
#include "buffer.h"
@@ -30,6 +32,22 @@
#include "deattack.h"
#include "channels.h"
+#include "compat.h"
+#include "ssh2.h"
+
+#include <ssl/bn.h>
+#include <ssl/dh.h>
+#include <ssl/hmac.h>
+#include "buffer.h"
+#include "kex.h"
+#include "hmac.h"
+
+#ifdef PACKET_DEBUG
+#define DBG(x) x
+#else
+#define DBG(x)
+#endif
+
/*
* This variable contains the file descriptors used for communicating with
* the other side. connection_in is used for reading; connection_out for
@@ -81,11 +99,45 @@
/* Set to true if the connection is interactive. */
static int interactive_mode = 0;
+/* True if SSH2 packet format is used */
+int use_ssh2_packet_format = 0;
+
+/* Session key information for Encryption and MAC */
+Kex *kex = NULL;
+
+void
+packet_set_kex(Kex *k)
+{
+ if( k->mac[MODE_IN ].key == NULL ||
+ k->enc[MODE_IN ].key == NULL ||
+ k->enc[MODE_IN ].iv == NULL ||
+ k->mac[MODE_OUT].key == NULL ||
+ k->enc[MODE_OUT].key == NULL ||
+ k->enc[MODE_OUT].iv == NULL)
+ fatal("bad KEX");
+ kex = k;
+}
+void
+clear_enc_keys(Enc *enc, int len)
+{
+ memset(enc->iv, 0, len);
+ memset(enc->key, 0, len);
+ xfree(enc->iv);
+ xfree(enc->key);
+ enc->iv = NULL;
+ enc->key = NULL;
+}
+void
+packet_set_ssh2_format(void)
+{
+ debug("use_ssh2_packet_format");
+ use_ssh2_packet_format = 1;
+}
+
/*
* Sets the descriptors used for communication. Disables encryption until
* packet_set_encryption_key is called.
*/
-
void
packet_set_connection(int fd_in, int fd_out)
{
@@ -225,6 +277,7 @@
* Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
*/
+/*** XXXXX todo: kex means re-init */
void
packet_start_compression(int level)
{
@@ -242,7 +295,7 @@
void
packet_encrypt(CipherContext * cc, void *dest, void *src,
- unsigned int bytes)
+ unsigned int bytes)
{
cipher_encrypt(cc, dest, src, bytes);
}
@@ -254,7 +307,7 @@
void
packet_decrypt(CipherContext * cc, void *dest, void *src,
- unsigned int bytes)
+ unsigned int bytes)
{
int i;
@@ -266,15 +319,11 @@
* (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com)
*/
- switch (cc->type) {
- case SSH_CIPHER_NONE:
+ if (cc->type == SSH_CIPHER_NONE || compat20) {
i = DEATTACK_OK;
- break;
- default:
+ } else {
i = detect_attack(src, bytes, NULL);
- break;
}
-
if (i == DEATTACK_DETECTED)
packet_disconnect("crc32 compensation attack: network attack detected");
@@ -289,8 +338,11 @@
void
packet_set_encryption_key(const unsigned char *key, unsigned int keylen,
- int cipher)
+ int cipher)
{
+ if (keylen < 20)
+ fatal("keylen too small: %d", keylen);
+
/* All other ciphers use the same key in both directions for now. */
cipher_set_key(&receive_context, cipher, key, keylen, 0);
cipher_set_key(&send_context, cipher, key, keylen, 1);
@@ -299,7 +351,7 @@
/* Starts constructing a packet to send. */
void
-packet_start(int type)
+packet_start1(int type)
{
char buf[9];
@@ -309,6 +361,29 @@
buffer_append(&outgoing_packet, buf, 9);
}
+void
+packet_start2(int type)
+{
+ char buf[4+1+1];
+
+ buffer_clear(&outgoing_packet);
+ memset(buf, 0, sizeof buf);
+ /* buf[0..3] = payload_len; */
+ /* buf[4] = pad_len; */
+ buf[5] = type & 0xff;
+ buffer_append(&outgoing_packet, buf, sizeof buf);
+}
+
+void
+packet_start(int type)
+{
+ DBG(debug("packet_start[%d]",type));
+ if (use_ssh2_packet_format)
+ packet_start2(type);
+ else
+ packet_start1(type);
+}
+
/* Appends a character to the packet data. */
void
@@ -333,6 +408,18 @@
{
buffer_put_string(&outgoing_packet, buf, len);
}
+void
+packet_put_cstring(const char *str)
+{
+ buffer_put_string(&outgoing_packet, str, strlen(str));
+}
+
+void
+packet_put_raw(const char *buf, unsigned int len)
+{
+ buffer_append(&outgoing_packet, buf, len);
+}
+
/* Appends an arbitrary precision integer to packet data. */
@@ -341,6 +428,11 @@
{
buffer_put_bignum(&outgoing_packet, value);
}
+void
+packet_put_bignum2(BIGNUM * value)
+{
+ buffer_put_bignum2(&outgoing_packet, value);
+}
/*
* Finalizes and sends the packet. If the encryption key has been set,
@@ -348,7 +440,7 @@
*/
void
-packet_send()
+packet_send1()
{
char buf[8], *cp;
int i, padding, len;
@@ -419,6 +511,139 @@
}
/*
+ * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
+ */
+void
+packet_send2()
+{
+ unsigned char *macbuf = NULL;
+ char *cp;
+ unsigned int packet_length = 0;
+ unsigned int i, padlen, len;
+ u_int32_t rand = 0;
+ static unsigned int seqnr = 0;
+ int type;
+ Enc *enc = NULL;
+ Mac *mac = NULL;
+ Comp *comp = NULL;
+ int block_size;
+
+ if (kex != NULL) {
+ enc = &kex->enc[MODE_OUT];
+ mac = &kex->mac[MODE_OUT];
+ comp = &kex->comp[MODE_OUT];
+ }
+ block_size = enc ? enc->block_size : 8;
+
+ cp = buffer_ptr(&outgoing_packet);
+ type = cp[5] & 0xff;
+
+#ifdef PACKET_DEBUG
+ fprintf(stderr, "plain: ");
+ buffer_dump(&outgoing_packet);
+#endif
+
+ if (comp && comp->enabled) {
+ len = buffer_len(&outgoing_packet);
+ /* skip header, compress only payload */
+ buffer_consume(&outgoing_packet, 5);
+ buffer_clear(&compression_buffer);
+ buffer_compress(&outgoing_packet, &compression_buffer);
+ buffer_clear(&outgoing_packet);
+ buffer_append(&outgoing_packet, "\0\0\0\0\0", 5);
+ buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
+ buffer_len(&compression_buffer));
+ DBG(debug("compression: raw %d compressed %d", len,
+ buffer_len(&outgoing_packet)));
+ }
+
+ /* sizeof (packet_len + pad_len + payload) */
+ len = buffer_len(&outgoing_packet);
+
+ /*
+ * calc size of padding, alloc space, get random data,
+ * minimum padding is 4 bytes
+ */
+ padlen = block_size - (len % block_size);
+ if (padlen < 4)
+ padlen += block_size;
+ buffer_append_space(&outgoing_packet, &cp, padlen);
+ if (enc && enc->type != SSH_CIPHER_NONE) {
+ for (i = 0; i < padlen; i++) {
+ if (i % 4 == 0)
+ rand = arc4random();
+ cp[i] = rand & 0xff;
+ rand <<= 8;
+ }
+ }
+ /* packet_length includes payload, padding and padding length field */
+ packet_length = buffer_len(&outgoing_packet) - 4;
+ cp = buffer_ptr(&outgoing_packet);
+ PUT_32BIT(cp, packet_length);
+ cp[4] = padlen & 0xff;
+ DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
+
+ /* compute MAC over seqnr and packet(length fields, payload, padding) */
+ if (mac && mac->enabled) {
+ macbuf = hmac( mac->md, seqnr,
+ (unsigned char *) buffer_ptr(&outgoing_packet),
+ buffer_len(&outgoing_packet),
+ mac->key, mac->key_len
+ );
+ DBG(debug("done calc HMAC out #%d", seqnr));
+ }
+ /* encrypt packet and append to output buffer. */
+ buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
+ packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
+ buffer_len(&outgoing_packet));
+ /* append unencrypted MAC */
+ if (mac && mac->enabled)
+ buffer_append(&output, (char *)macbuf, mac->mac_len);
+#ifdef PACKET_DEBUG
+ fprintf(stderr, "encrypted: ");
+ buffer_dump(&output);
+#endif
+ /* increment sequence number for outgoing packets */
+ if (++seqnr == 0)
+ log("outgoing seqnr wraps around");
+ buffer_clear(&outgoing_packet);
+
+ if (type == SSH2_MSG_NEWKEYS) {
+ if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
+ fatal("packet_send2: no KEX");
+ if (mac->md != NULL)
+ mac->enabled = 1;
+ debug("cipher_set_key_iv send_context");
+ cipher_set_key_iv(&send_context, enc->type,
+ enc->key, enc->key_len,
+ enc->iv, enc->iv_len);
+ clear_enc_keys(enc, kex->we_need);
+ if (comp->type != 0 && comp->enabled == 0) {
+ comp->enabled = 1;
+ if (! packet_compression)
+ packet_start_compression(6);
+ }
+ }
+}
+
+void
+packet_send()
+{
+ if (use_ssh2_packet_format)
+ packet_send2();
+ else
+ packet_send1();
+ DBG(debug("packet_send done"));
+}
+
+void
+packet_send_and_wait()
+{
+ packet_send();
+ packet_write_wait();
+}
+
+/*
* Waits until a packet has been received, and returns its type. Note that
* no other data is processed until this returns, so this function should not
* be used during the interactive session.
@@ -430,6 +655,7 @@
int type, len;
fd_set set;
char buf[8192];
+ DBG(debug("packet_read()"));
/* Since we are blocking, ensure that all written packets have been sent. */
packet_write_wait();
@@ -483,7 +709,7 @@
type = packet_read(payload_len_ptr);
if (type != expected_type)
packet_disconnect("Protocol error: expected packet type %d, got %d",
- expected_type, type);
+ expected_type, type);
}
/* Checks if a full packet is available in the data received so far via
@@ -502,15 +728,13 @@
*/
int
-packet_read_poll(int *payload_len_ptr)
+packet_read_poll1(int *payload_len_ptr)
{
unsigned int len, padded_len;
unsigned char *ucp;
- char buf[8], *cp, *msg;
+ char buf[8], *cp;
unsigned int checksum, stored_checksum;
-restart:
-
/* Check if input size is less than minimum packet size. */
if (buffer_len(&input) < 4 + 8)
return SSH_MSG_NONE;
@@ -543,7 +767,7 @@
/* Compute packet checksum. */
checksum = crc32((unsigned char *) buffer_ptr(&incoming_packet),
- buffer_len(&incoming_packet) - 4);
+ buffer_len(&incoming_packet) - 4);
/* Skip padding. */
buffer_consume(&incoming_packet, 8 - len % 8);
@@ -552,7 +776,7 @@
if (len != buffer_len(&incoming_packet))
packet_disconnect("packet_read_poll: len %d != buffer_len %d.",
- len, buffer_len(&incoming_packet));
+ len, buffer_len(&incoming_packet));
ucp = (unsigned char *) buffer_ptr(&incoming_packet) + len - 4;
stored_checksum = GET_32BIT(ucp);
@@ -566,7 +790,7 @@
buffer_uncompress(&incoming_packet, &compression_buffer);
buffer_clear(&incoming_packet);
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
- buffer_len(&compression_buffer));
+ buffer_len(&compression_buffer));
}
/* Get packet type. */
buffer_get(&incoming_packet, &buf[0], 1);
@@ -574,29 +798,208 @@
/* Return length of payload (without type field). */
*payload_len_ptr = buffer_len(&incoming_packet);
- /* Handle disconnect message. */
- if ((unsigned char) buf[0] == SSH_MSG_DISCONNECT) {
- msg = packet_get_string(NULL);
- log("Received disconnect: %.900s", msg);
- xfree(msg);
- fatal_cleanup();
- }
-
- /* Ignore ignore messages. */
- if ((unsigned char) buf[0] == SSH_MSG_IGNORE)
- goto restart;
-
- /* Send debug messages as debugging output. */
- if ((unsigned char) buf[0] == SSH_MSG_DEBUG) {
- msg = packet_get_string(NULL);
- debug("Remote: %.900s", msg);
- xfree(msg);
- goto restart;
- }
/* Return type. */
return (unsigned char) buf[0];
}
+int
+packet_read_poll2(int *payload_len_ptr)
+{
+ unsigned int padlen, need;
+ unsigned char buf[8], *macbuf;
+ unsigned char *ucp;
+ char *cp;
+ static unsigned int packet_length = 0;
+ static unsigned int seqnr = 0;
+ int type;
+ int maclen, block_size;
+ Enc *enc = NULL;
+ Mac *mac = NULL;
+ Comp *comp = NULL;
+
+ if (kex != NULL) {
+ enc = &kex->enc[MODE_IN];
+ mac = &kex->mac[MODE_IN];
+ comp = &kex->comp[MODE_IN];
+ }
+ maclen = mac && mac->enabled ? mac->mac_len : 0;
+ block_size = enc ? enc->block_size : 8;
+
+ if (packet_length == 0) {
+ /*
+ * check if input size is less than the cipher block size,
+ * decrypt first block and extract length of incoming packet
+ */
+ if (buffer_len(&input) < block_size)
+ return SSH_MSG_NONE;
+ buffer_clear(&incoming_packet);
+ buffer_append_space(&incoming_packet, &cp, block_size);
+ packet_decrypt(&receive_context, cp, buffer_ptr(&input),
+ block_size);
+ ucp = (unsigned char *) buffer_ptr(&incoming_packet);
+ packet_length = GET_32BIT(ucp);
+ if (packet_length < 1 + 4 || packet_length > 256 * 1024) {
+ buffer_dump(&incoming_packet);
+ packet_disconnect("Bad packet length %d.", packet_length);
+ }
+ DBG(debug("input: packet len %d", packet_length+4));
+ buffer_consume(&input, block_size);
+ }
+ /* we have a partial packet of block_size bytes */
+ need = 4 + packet_length - block_size;
+ DBG(debug("partial packet %d, need %d, maclen %d", block_size,
+ need, maclen));
+ if (need % block_size != 0)
+ fatal("padding error: need %d block %d mod %d",
+ need, block_size, need % block_size);
+ /*
+ * check if the entire packet has been received and
+ * decrypt into incoming_packet
+ */
+ if (buffer_len(&input) < need + maclen)
+ return SSH_MSG_NONE;
+#ifdef PACKET_DEBUG
+ fprintf(stderr, "read_poll enc/full: ");
+ buffer_dump(&input);
+#endif
+ buffer_append_space(&incoming_packet, &cp, need);
+ packet_decrypt(&receive_context, cp, buffer_ptr(&input), need);
+ buffer_consume(&input, need);
+ /*
+ * compute MAC over seqnr and packet,
+ * increment sequence number for incoming packet
+ */
+ if (mac && mac->enabled) {
+ macbuf = hmac( mac->md, seqnr,
+ (unsigned char *) buffer_ptr(&incoming_packet),
+ buffer_len(&incoming_packet),
+ mac->key, mac->key_len
+ );
+ if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0)
+ packet_disconnect("Corrupted HMAC on input.");
+ DBG(debug("HMAC #%d ok", seqnr));
+ buffer_consume(&input, mac->mac_len);
+ }
+ if (++seqnr == 0)
+ log("incoming seqnr wraps around");
+
+ /* get padlen */
+ cp = buffer_ptr(&incoming_packet) + 4;
+ padlen = *cp & 0xff;
+ DBG(debug("input: padlen %d", padlen));
+ if (padlen < 4)
+ packet_disconnect("Corrupted padlen %d on input.", padlen);
+
+ /* skip packet size + padlen, discard padding */
+ buffer_consume(&incoming_packet, 4 + 1);
+ buffer_consume_end(&incoming_packet, padlen);
+
+ DBG(debug("input: len before de-compress %d", buffer_len(&incoming_packet)));
+ if (comp && comp->enabled) {
+ buffer_clear(&compression_buffer);
+ buffer_uncompress(&incoming_packet, &compression_buffer);
+ buffer_clear(&incoming_packet);
+ buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
+ buffer_len(&compression_buffer));
+ DBG(debug("input: len after de-compress %d", buffer_len(&incoming_packet)));
+ }
+ /*
+ * get packet type, implies consume.
+ * return length of payload (without type field)
+ */
+ buffer_get(&incoming_packet, (char *)&buf[0], 1);
+ *payload_len_ptr = buffer_len(&incoming_packet);
+
+ /* reset for next packet */
+ packet_length = 0;
+
+ /* extract packet type */
+ type = (unsigned char)buf[0];
+
+ if (type == SSH2_MSG_NEWKEYS) {
+ if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
+ fatal("packet_read_poll2: no KEX");
+ if (mac->md != NULL)
+ mac->enabled = 1;
+ debug("cipher_set_key_iv receive_context");
+ cipher_set_key_iv(&receive_context, enc->type,
+ enc->key, enc->key_len,
+ enc->iv, enc->iv_len);
+ clear_enc_keys(enc, kex->we_need);
+ if (comp->type != 0 && comp->enabled == 0) {
+ comp->enabled = 1;
+ if (! packet_compression)
+ packet_start_compression(6);
+ }
+ }
+
+#ifdef PACKET_DEBUG
+ fprintf(stderr, "read/plain[%d]:\r\n",type);
+ buffer_dump(&incoming_packet);
+#endif
+ return (unsigned char)type;
+}
+
+int
+packet_read_poll(int *payload_len_ptr)
+{
+ char *msg;
+ for (;;) {
+ int type = use_ssh2_packet_format ?
+ packet_read_poll2(payload_len_ptr):
+ packet_read_poll1(payload_len_ptr);
+
+ if(compat20) {
+ int reason;
+ if (type != 0)
+ DBG(debug("received packet type %d", type));
+ switch(type) {
+ case SSH2_MSG_IGNORE:
+ break;
+ case SSH2_MSG_DEBUG:
+ packet_get_char();
+ msg = packet_get_string(NULL);
+ debug("Remote: %.900s", msg);
+ xfree(msg);
+ msg = packet_get_string(NULL);
+ xfree(msg);
+ break;
+ case SSH2_MSG_DISCONNECT:
+ reason = packet_get_int();
+ msg = packet_get_string(NULL);
+ log("Received disconnect: %d: %.900s", reason, msg);
+ xfree(msg);
+ fatal_cleanup();
+ break;
+ default:
+ return type;
+ break;
+ }
+ } else {
+ switch(type) {
+ case SSH_MSG_IGNORE:
+ break;
+ case SSH_MSG_DEBUG:
+ msg = packet_get_string(NULL);
+ debug("Remote: %.900s", msg);
+ xfree(msg);
+ break;
+ case SSH_MSG_DISCONNECT:
+ msg = packet_get_string(NULL);
+ log("Received disconnect: %.900s", msg);
+ fatal_cleanup();
+ xfree(msg);
+ break;
+ default:
+ if (type != 0)
+ DBG(debug("received packet type %d", type));
+ return type;
+ break;
+ }
+ }
+ }
+}
+
/*
* Buffers the given amount of input characters. This is intended to be used
* together with packet_read_poll.
@@ -637,6 +1040,21 @@
*length_ptr = buffer_get_bignum(&incoming_packet, value);
}
+void
+packet_get_bignum2(BIGNUM * value, int *length_ptr)
+{
+ *length_ptr = buffer_get_bignum2(&incoming_packet, value);
+}
+
+char *
+packet_get_raw(int *length_ptr)
+{
+ int bytes = buffer_len(&incoming_packet);
+ if (length_ptr != NULL)
+ *length_ptr = bytes;
+ return buffer_ptr(&incoming_packet);
+}
+
/*
* Returns a string from the packet data. The string is allocated using
* xmalloc; it is the responsibility of the calling program to free it when
@@ -701,8 +1119,15 @@
va_end(args);
/* Send the disconnect message to the other side, and wait for it to get sent. */
- packet_start(SSH_MSG_DISCONNECT);
- packet_put_string(buf, strlen(buf));
+ if (compat20) {
+ packet_start(SSH2_MSG_DISCONNECT);
+ packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
+ packet_put_cstring(buf);
+ packet_put_cstring("");
+ } else {
+ packet_start(SSH_MSG_DISCONNECT);
+ packet_put_string(buf, strlen(buf));
+ }
packet_send();
packet_write_wait();
@@ -833,7 +1258,8 @@
{
static int called = 0;
if (called) {
- log("packet_set_maxsize: called twice: old %d new %d", max_packet_size, s);
+ log("packet_set_maxsize: called twice: old %d new %d",
+ max_packet_size, s);
return -1;
}
if (s < 4 * 1024 || s > 1024 * 1024) {
diff --git a/packet.h b/packet.h
index d1fc41d..39c0ede 100644
--- a/packet.h
+++ b/packet.h
@@ -13,7 +13,7 @@
*
*/
-/* RCSID("$Id: packet.h,v 1.10 2000/03/17 12:40:16 damien Exp $"); */
+/* RCSID("$Id: packet.h,v 1.11 2000/04/04 04:39:03 damien Exp $"); */
#ifndef PACKET_H
#define PACKET_H
@@ -90,9 +90,12 @@
/* Appends an arbitrary precision integer to packet data. */
void packet_put_bignum(BIGNUM * value);
+void packet_put_bignum2(BIGNUM * value);
/* Appends a string to packet data. */
void packet_put_string(const char *buf, unsigned int len);
+void packet_put_cstring(const char *str);
+void packet_put_raw(const char *buf, unsigned int len);
/*
* Finalizes and sends the packet. If the encryption key has been set,
@@ -136,6 +139,8 @@
* must have been initialized before this call.
*/
void packet_get_bignum(BIGNUM * value, int *length_ptr);
+void packet_get_bignum2(BIGNUM * value, int *length_ptr);
+char *packet_get_raw(int *length_ptr);
/*
* Returns a string from the packet data. The string is allocated using
@@ -202,4 +207,7 @@
int packet_connection_is_on_socket(void);
int packet_connection_is_ipv4(void);
+/* enable SSH2 packet format */
+void packet_set_ssh2_format(void);
+
#endif /* PACKET_H */