openssh-portable/nchan.c

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/*
* Copyright (c) 1999, 2000, 2001, 2002 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.
*
* 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.
*/
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#include "includes.h"
RCSID("$OpenBSD: nchan.c,v 1.51 2004/07/11 17:48:47 deraadt Exp $");
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Hopefully things did not get mixed around too much. It compiles under Linux and works. So that is at least a good sign. =) 20010122 - (bal) OpenBSD Resync - markus@cvs.openbsd.org 2001/01/19 12:45:26 GMT 2001 by markus [servconf.c ssh.h sshd.c] only auth-chall.c needs #ifdef SKEY - markus@cvs.openbsd.org 2001/01/19 15:55:10 GMT 2001 by markus [auth-krb4.c auth-options.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth1.c auth2.c channels.c clientloop.c dh.c dispatch.c nchan.c packet.c pathname.h readconf.c scp.c servconf.c serverloop.c session.c ssh-add.c ssh-keygen.c ssh-keyscan.c ssh.c ssh.h ssh1.h sshconnect1.c sshd.c ttymodes.c] move ssh1 definitions to ssh1.h, pathnames to pathnames.h - markus@cvs.openbsd.org 2001/01/19 16:48:14 [sshd.8] fix typo; from stevesk@ - markus@cvs.openbsd.org 2001/01/19 16:50:58 [ssh-dss.c] clear and free digest, make consistent with other code (use dlen); from stevesk@ - markus@cvs.openbsd.org 2001/01/20 15:55:20 GMT 2001 by markus [auth-options.c auth-options.h auth-rsa.c auth2.c] pass the filename to auth_parse_options() - markus@cvs.openbsd.org 2001/01/20 17:59:40 GMT 2001 [readconf.c] fix SIGSEGV from -o ""; problem noted by jehsom@togetherweb.com - stevesk@cvs.openbsd.org 2001/01/20 18:20:29 [sshconnect2.c] dh_new_group() does not return NULL. ok markus@ - markus@cvs.openbsd.org 2001/01/20 21:33:42 [ssh-add.c] do not loop forever if askpass does not exist; from andrew@pimlott.ne.mediaone.net - djm@cvs.openbsd.org 2001/01/20 23:00:56 [servconf.c] Check for NULL return from strdelim; ok markus - djm@cvs.openbsd.org 2001/01/20 23:02:07 [readconf.c] KNF; ok markus - jakob@cvs.openbsd.org 2001/01/21 9:00:33 [ssh-keygen.1] remove -R flag; ok markus@ - markus@cvs.openbsd.org 2001/01/21 19:05:40 [atomicio.c automicio.h auth-chall.c auth-krb4.c auth-options.c auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth.c auth.h auth1.c auth2-chall.c auth2.c authfd.c authfile.c bufaux.c bufaux.h buffer.c canahost.c canahost.h channels.c cipher.c cli.c clientloop.c clientloop.h compat.c compress.c deattack.c dh.c dispatch.c groupaccess.c hmac.c hostfile.c kex.c key.c key.h log-client.c log-server.c log.c log.h login.c login.h match.c misc.c misc.h nchan.c packet.c pty.c radix.h readconf.c readpass.c readpass.h rsa.c scp.c servconf.c serverloop.c serverloop.h session.c sftp-server.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c ssh-rsa.c ssh.c ssh.h sshconnect.c sshconnect.h sshconnect1.c sshconnect2.c sshd.c tildexpand.c tildexpand.h ttysmodes.c uidswap.c xmalloc.c] split ssh.h and try to cleanup the #include mess. remove unnecessary #includes. rename util.[ch] -> misc.[ch] - (bal) renamed 'PIDDIR' to '_PATH_SSH_PIDDIR' to match OpenBSD tree - (bal) Moved #ifdef KRB4 in auth-krb4.c above the #include to resolve conflict when compiling for non-kerb install - (bal) removed the #ifdef SKEY in auth1.c to match Markus' changes on 1/19.
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#include "ssh1.h"
#include "ssh2.h"
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#include "buffer.h"
#include "packet.h"
#include "channels.h"
#include "compat.h"
Hopefully things did not get mixed around too much. It compiles under Linux and works. So that is at least a good sign. =) 20010122 - (bal) OpenBSD Resync - markus@cvs.openbsd.org 2001/01/19 12:45:26 GMT 2001 by markus [servconf.c ssh.h sshd.c] only auth-chall.c needs #ifdef SKEY - markus@cvs.openbsd.org 2001/01/19 15:55:10 GMT 2001 by markus [auth-krb4.c auth-options.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth1.c auth2.c channels.c clientloop.c dh.c dispatch.c nchan.c packet.c pathname.h readconf.c scp.c servconf.c serverloop.c session.c ssh-add.c ssh-keygen.c ssh-keyscan.c ssh.c ssh.h ssh1.h sshconnect1.c sshd.c ttymodes.c] move ssh1 definitions to ssh1.h, pathnames to pathnames.h - markus@cvs.openbsd.org 2001/01/19 16:48:14 [sshd.8] fix typo; from stevesk@ - markus@cvs.openbsd.org 2001/01/19 16:50:58 [ssh-dss.c] clear and free digest, make consistent with other code (use dlen); from stevesk@ - markus@cvs.openbsd.org 2001/01/20 15:55:20 GMT 2001 by markus [auth-options.c auth-options.h auth-rsa.c auth2.c] pass the filename to auth_parse_options() - markus@cvs.openbsd.org 2001/01/20 17:59:40 GMT 2001 [readconf.c] fix SIGSEGV from -o ""; problem noted by jehsom@togetherweb.com - stevesk@cvs.openbsd.org 2001/01/20 18:20:29 [sshconnect2.c] dh_new_group() does not return NULL. ok markus@ - markus@cvs.openbsd.org 2001/01/20 21:33:42 [ssh-add.c] do not loop forever if askpass does not exist; from andrew@pimlott.ne.mediaone.net - djm@cvs.openbsd.org 2001/01/20 23:00:56 [servconf.c] Check for NULL return from strdelim; ok markus - djm@cvs.openbsd.org 2001/01/20 23:02:07 [readconf.c] KNF; ok markus - jakob@cvs.openbsd.org 2001/01/21 9:00:33 [ssh-keygen.1] remove -R flag; ok markus@ - markus@cvs.openbsd.org 2001/01/21 19:05:40 [atomicio.c automicio.h auth-chall.c auth-krb4.c auth-options.c auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth.c auth.h auth1.c auth2-chall.c auth2.c authfd.c authfile.c bufaux.c bufaux.h buffer.c canahost.c canahost.h channels.c cipher.c cli.c clientloop.c clientloop.h compat.c compress.c deattack.c dh.c dispatch.c groupaccess.c hmac.c hostfile.c kex.c key.c key.h log-client.c log-server.c log.c log.h login.c login.h match.c misc.c misc.h nchan.c packet.c pty.c radix.h readconf.c readpass.c readpass.h rsa.c scp.c servconf.c serverloop.c serverloop.h session.c sftp-server.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c ssh-rsa.c ssh.c ssh.h sshconnect.c sshconnect.h sshconnect1.c sshconnect2.c sshd.c tildexpand.c tildexpand.h ttysmodes.c uidswap.c xmalloc.c] split ssh.h and try to cleanup the #include mess. remove unnecessary #includes. rename util.[ch] -> misc.[ch] - (bal) renamed 'PIDDIR' to '_PATH_SSH_PIDDIR' to match OpenBSD tree - (bal) Moved #ifdef KRB4 in auth-krb4.c above the #include to resolve conflict when compiling for non-kerb install - (bal) removed the #ifdef SKEY in auth1.c to match Markus' changes on 1/19.
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#include "log.h"
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/*
* SSH Protocol 1.5 aka New Channel Protocol
* Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
* Written by Markus Friedl in October 1999
*
* Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
* tear down of channels:
*
* 1.3: strict request-ack-protocol:
* CLOSE ->
* <- CLOSE_CONFIRM
*
* 1.5: uses variations of:
* IEOF ->
* <- OCLOSE
* <- IEOF
* OCLOSE ->
* i.e. both sides have to close the channel
*
* 2.0: the EOF messages are optional
*
* See the debugging output from 'ssh -v' and 'sshd -d' of
* ssh-1.2.27 as an example.
*
*/
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/* functions manipulating channel states */
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/*
* EVENTS update channel input/output states execute ACTIONS
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*/
/*
* ACTIONS: should never update the channel states
*/
static void chan_send_ieof1(Channel *);
static void chan_send_oclose1(Channel *);
static void chan_send_close2(Channel *);
static void chan_send_eof2(Channel *);
/* helper */
static void chan_shutdown_write(Channel *);
static void chan_shutdown_read(Channel *);
static char *ostates[] = { "open", "drain", "wait_ieof", "closed" };
static char *istates[] = { "open", "drain", "wait_oclose", "closed" };
static void
chan_set_istate(Channel *c, u_int next)
{
if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED)
fatal("chan_set_istate: bad state %d -> %d", c->istate, next);
debug2("channel %d: input %s -> %s", c->self, istates[c->istate],
istates[next]);
c->istate = next;
}
static void
chan_set_ostate(Channel *c, u_int next)
{
if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED)
fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next);
debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate],
ostates[next]);
c->ostate = next;
}
/*
* SSH1 specific implementation of event functions
*/
static void
chan_rcvd_oclose1(Channel *c)
{
debug2("channel %d: rcvd oclose", c->self);
switch (c->istate) {
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case CHAN_INPUT_WAIT_OCLOSE:
chan_set_istate(c, CHAN_INPUT_CLOSED);
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break;
case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
case CHAN_INPUT_WAIT_DRAIN:
/* both local read_failed and remote write_failed */
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
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break;
default:
error("channel %d: protocol error: rcvd_oclose for istate %d",
c->self, c->istate);
return;
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}
}
void
chan_read_failed(Channel *c)
{
debug2("channel %d: read failed", c->self);
switch (c->istate) {
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case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN);
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break;
default:
error("channel %d: chan_read_failed for istate %d",
c->self, c->istate);
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break;
}
}
void
chan_ibuf_empty(Channel *c)
{
debug2("channel %d: ibuf empty", c->self);
if (buffer_len(&c->input)) {
error("channel %d: chan_ibuf_empty for non empty buffer",
c->self);
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return;
}
switch (c->istate) {
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case CHAN_INPUT_WAIT_DRAIN:
if (compat20) {
if (!(c->flags & CHAN_CLOSE_SENT))
chan_send_eof2(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
} else {
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE);
}
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break;
default:
error("channel %d: chan_ibuf_empty for istate %d",
c->self, c->istate);
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break;
}
}
static void
chan_rcvd_ieof1(Channel *c)
{
debug2("channel %d: rcvd ieof", c->self);
switch (c->ostate) {
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case CHAN_OUTPUT_OPEN:
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
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break;
case CHAN_OUTPUT_WAIT_IEOF:
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
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break;
default:
error("channel %d: protocol error: rcvd_ieof for ostate %d",
c->self, c->ostate);
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break;
}
}
static void
chan_write_failed1(Channel *c)
{
debug2("channel %d: write failed", c->self);
switch (c->ostate) {
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case CHAN_OUTPUT_OPEN:
chan_shutdown_write(c);
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF);
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break;
case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
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break;
default:
error("channel %d: chan_write_failed for ostate %d",
c->self, c->ostate);
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break;
}
}
void
chan_obuf_empty(Channel *c)
{
debug2("channel %d: obuf empty", c->self);
if (buffer_len(&c->output)) {
error("channel %d: chan_obuf_empty for non empty buffer",
c->self);
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return;
}
switch (c->ostate) {
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case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
if (!compat20)
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
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break;
default:
error("channel %d: internal error: obuf_empty for ostate %d",
c->self, c->ostate);
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break;
}
}
static void
chan_send_ieof1(Channel *c)
{
debug2("channel %d: send ieof", c->self);
switch (c->istate) {
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case CHAN_INPUT_OPEN:
case CHAN_INPUT_WAIT_DRAIN:
packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send ieof for istate %d",
c->self, c->istate);
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break;
}
}
static void
chan_send_oclose1(Channel *c)
{
debug2("channel %d: send oclose", c->self);
switch (c->ostate) {
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case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
buffer_clear(&c->output);
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packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send oclose for ostate %d",
c->self, c->ostate);
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break;
}
}
/*
* the same for SSH2
*/
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static void
chan_rcvd_close2(Channel *c)
{
debug2("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 */
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
chan_set_istate(c, 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
*/
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
break;
}
switch (c->istate) {
case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
case CHAN_INPUT_WAIT_DRAIN:
chan_send_eof2(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
}
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}
static void
chan_rcvd_eof2(Channel *c)
{
debug2("channel %d: rcvd eof", c->self);
c->flags |= CHAN_EOF_RCVD;
if (c->ostate == CHAN_OUTPUT_OPEN)
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
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}
static void
chan_write_failed2(Channel *c)
{
debug2("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
error("channel %d: chan_write_failed for ostate %d",
c->self, c->ostate);
break;
}
}
static void
chan_send_eof2(Channel *c)
{
debug2("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();
c->flags |= CHAN_EOF_SENT;
break;
default:
error("channel %d: cannot send eof for istate %d",
c->self, c->istate);
break;
}
}
static void
chan_send_close2(Channel *c)
{
debug2("channel %d: send close", c->self);
if (c->ostate != CHAN_OUTPUT_CLOSED ||
c->istate != CHAN_INPUT_CLOSED) {
error("channel %d: cannot send close for istate/ostate %d/%d",
c->self, c->istate, c->ostate);
} else if (c->flags & CHAN_CLOSE_SENT) {
error("channel %d: 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;
}
}
/* shared */
void
chan_rcvd_ieof(Channel *c)
{
if (compat20)
chan_rcvd_eof2(c);
else
chan_rcvd_ieof1(c);
if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN &&
buffer_len(&c->output) == 0 &&
!CHANNEL_EFD_OUTPUT_ACTIVE(c))
chan_obuf_empty(c);
}
void
chan_rcvd_oclose(Channel *c)
{
if (compat20)
chan_rcvd_close2(c);
else
chan_rcvd_oclose1(c);
}
void
chan_write_failed(Channel *c)
{
if (compat20)
chan_write_failed2(c);
else
chan_write_failed1(c);
}
void
chan_mark_dead(Channel *c)
{
c->type = SSH_CHANNEL_ZOMBIE;
}
int
chan_is_dead(Channel *c, int do_send)
{
if (c->type == SSH_CHANNEL_ZOMBIE) {
debug2("channel %d: zombie", c->self);
return 1;
}
if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED)
return 0;
if (!compat20) {
debug2("channel %d: is dead", c->self);
return 1;
}
if ((datafellows & SSH_BUG_EXTEOF) &&
c->extended_usage == CHAN_EXTENDED_WRITE &&
c->efd != -1 &&
buffer_len(&c->extended) > 0) {
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debug2("channel %d: active efd: %d len %d",
c->self, c->efd, buffer_len(&c->extended));
return 0;
}
if (!(c->flags & CHAN_CLOSE_SENT)) {
if (do_send) {
chan_send_close2(c);
} else {
/* channel would be dead if we sent a close */
if (c->flags & CHAN_CLOSE_RCVD) {
debug2("channel %d: almost dead",
c->self);
return 1;
}
}
}
if ((c->flags & CHAN_CLOSE_SENT) &&
(c->flags & CHAN_CLOSE_RCVD)) {
debug2("channel %d: is dead", c->self);
return 1;
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}
return 0;
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}
/* helper */
static void
chan_shutdown_write(Channel *c)
{
buffer_clear(&c->output);
if (compat20 && c->type == SSH_CHANNEL_LARVAL)
return;
/* shutdown failure is allowed if write failed already */
debug2("channel %d: close_write", c->self);
if (c->sock != -1) {
if (shutdown(c->sock, SHUT_WR) < 0)
debug2("channel %d: chan_shutdown_write: "
"shutdown() failed for fd%d: %.100s",
c->self, c->sock, strerror(errno));
} else {
if (channel_close_fd(&c->wfd) < 0)
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logit("channel %d: chan_shutdown_write: "
"close() failed for fd%d: %.100s",
c->self, c->wfd, strerror(errno));
}
}
static void
chan_shutdown_read(Channel *c)
{
if (compat20 && c->type == SSH_CHANNEL_LARVAL)
return;
debug2("channel %d: close_read", c->self);
if (c->sock != -1) {
/*
* shutdown(sock, SHUT_READ) may return ENOTCONN if the
* write side has been closed already. (bug on Linux)
* HP-UX may return ENOTCONN also.
*/
if (shutdown(c->sock, SHUT_RD) < 0
&& errno != ENOTCONN)
error("channel %d: chan_shutdown_read: "
"shutdown() failed for fd%d [i%d o%d]: %.100s",
c->self, c->sock, c->istate, c->ostate,
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strerror(errno));
} else {
if (channel_close_fd(&c->rfd) < 0)
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logit("channel %d: chan_shutdown_read: "
"close() failed for fd%d: %.100s",
c->self, c->rfd, strerror(errno));
}
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}