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- djm@cvs.openbsd.org 2012/08/17 01:30:00 

[compat.c sshconnect.c]
     Send client banner immediately, rather than waiting for the server to
     move first for SSH protocol 2 connections (the default). Patch based on
     one in bz#1999 by tls AT panix.com, feedback dtucker@ ok markus@
This commit is contained in:
Darren Tucker 2012-09-06 21:21:56 +10:00
parent f09a8a6c6d
commit 00c1518a4d
3 changed files with 42 additions and 14 deletions
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5
ChangeLog
View File

@ -17,6 +17,11 @@
[ssh-keygen.c]
print details of which host lines were deleted when using
"ssh-keygen -R host"; ok markus@
- djm@cvs.openbsd.org 2012/08/17 01:30:00
[compat.c sshconnect.c]
Send client banner immediately, rather than waiting for the server to
move first for SSH protocol 2 connections (the default). Patch based on
one in bz#1999 by tls AT panix.com, feedback dtucker@ ok markus@
20120830
- (dtucker) [moduli] Import new moduli file.

4
compat.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: compat.c,v 1.79 2011/09/23 07:45:05 markus Exp $ */
/* $OpenBSD: compat.c,v 1.80 2012/08/17 01:30:00 djm Exp $ */
/*
* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
*
@ -45,6 +45,8 @@ int datafellows = 0;
void
enable_compat20(void)
{
if (compat20)
return;
debug("Enabling compatibility mode for protocol 2.0");
compat20 = 1;
}

47
sshconnect.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sshconnect.c,v 1.234 2011/05/24 07:15:47 djm Exp $ */
/* $OpenBSD: sshconnect.c,v 1.235 2012/08/17 01:30:00 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -429,6 +429,26 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
return 0;
}
static void
send_client_banner(int connection_out, int minor1)
{
char buf[256];
/* Send our own protocol version identification. */
if (compat20) {
xasprintf(&client_version_string, "SSH-%d.%d-%.100s\r\n",
PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_VERSION);
} else {
xasprintf(&client_version_string, "SSH-%d.%d-%.100s\n",
PROTOCOL_MAJOR_1, minor1, SSH_VERSION);
}
if (roaming_atomicio(vwrite, connection_out, client_version_string,
strlen(client_version_string)) != strlen(client_version_string))
fatal("write: %.100s", strerror(errno));
chop(client_version_string);
debug("Local version string %.100s", client_version_string);
}
/*
* Waits for the server identification string, and sends our own
* identification string.
@ -440,7 +460,7 @@ ssh_exchange_identification(int timeout_ms)
int remote_major, remote_minor, mismatch;
int connection_in = packet_get_connection_in();
int connection_out = packet_get_connection_out();
int minor1 = PROTOCOL_MINOR_1;
int minor1 = PROTOCOL_MINOR_1, client_banner_sent = 0;
u_int i, n;
size_t len;
int fdsetsz, remaining, rc;
@ -450,6 +470,16 @@ ssh_exchange_identification(int timeout_ms)
fdsetsz = howmany(connection_in + 1, NFDBITS) * sizeof(fd_mask);
fdset = xcalloc(1, fdsetsz);
/*
* If we are SSH2-only then we can send the banner immediately and
* save a round-trip.
*/
if (options.protocol == SSH_PROTO_2) {
enable_compat20();
send_client_banner(connection_out, 0);
client_banner_sent = 1;
}
/* Read other side's version identification. */
remaining = timeout_ms;
for (n = 0;;) {
@ -552,18 +582,9 @@ ssh_exchange_identification(int timeout_ms)
fatal("Protocol major versions differ: %d vs. %d",
(options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
remote_major);
/* Send our own protocol version identification. */
snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s%s",
compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
compat20 ? PROTOCOL_MINOR_2 : minor1,
SSH_VERSION, compat20 ? "\r\n" : "\n");
if (roaming_atomicio(vwrite, connection_out, buf, strlen(buf))
!= strlen(buf))
fatal("write: %.100s", strerror(errno));
client_version_string = xstrdup(buf);
chop(client_version_string);
if (!client_banner_sent)
send_client_banner(connection_out, minor1);
chop(server_version_string);
debug("Local version string %.100s", client_version_string);
}
/* defaults to 'no' */