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f374ba41f5
Release notes are available at https://www.openssh.com/txt/release-9.2 OpenSSH 9.2 contains fixes for two security problems and a memory safety problem. The memory safety problem is not believed to be exploitable. These fixes have already been committed to OpenSSH 9.1 in FreeBSD. Some other notable items from the release notes: * ssh(1): add a new EnableEscapeCommandline ssh_config(5) option that controls whether the client-side ~C escape sequence that provides a command-line is available. Among other things, the ~C command-line could be used to add additional port-forwards at runtime. * sshd(8): add support for channel inactivity timeouts via a new sshd_config(5) ChannelTimeout directive. This allows channels that have not seen traffic in a configurable interval to be automatically closed. Different timeouts may be applied to session, X11, agent and TCP forwarding channels. * sshd(8): add a sshd_config UnusedConnectionTimeout option to terminate client connections that have no open channels for a length of time. This complements the ChannelTimeout option above. * sshd(8): add a -V (version) option to sshd like the ssh client has. * scp(1), sftp(1): add a -X option to both scp(1) and sftp(1) to allow control over some SFTP protocol parameters: the copy buffer length and the number of in-flight requests, both of which are used during upload/download. Previously these could be controlled in sftp(1) only. This makes them available in both SFTP protocol clients using the same option character sequence. * ssh-keyscan(1): allow scanning of complete CIDR address ranges, e.g. "ssh-keyscan 192.168.0.0/24". If a CIDR range is passed, then it will be expanded to all possible addresses in the range including the all-0s and all-1s addresses. bz#976 * ssh(1): support dynamic remote port forwarding in escape command-line's -R processing. bz#3499 MFC after: 1 week Sponsored by: The FreeBSD Foundation
92 lines
2.3 KiB
Bash
92 lines
2.3 KiB
Bash
# $OpenBSD: channel-timeout.sh,v 1.1 2023/01/06 08:07:39 djm Exp $
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# Placed in the Public Domain.
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tid="channel timeout"
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# XXX not comprehensive. Still need -R -L agent X11 forwarding + interactive
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rm -f $OBJ/sshd_proxy.orig
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy.orig
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verbose "no timeout"
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${SSH} -F $OBJ/ssh_proxy somehost "sleep 5 ; exit 23"
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r=$?
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if [ $r -ne 23 ]; then
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fail "ssh failed"
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fi
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verbose "command timeout"
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(cat $OBJ/sshd_proxy.orig ; echo "ChannelTimeout session:command=1") \
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> $OBJ/sshd_proxy
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${SSH} -F $OBJ/ssh_proxy somehost "sleep 5 ; exit 23"
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r=$?
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if [ $r -ne 255 ]; then
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fail "ssh returned unexpected error code $r"
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fi
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verbose "command wildcard timeout"
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(cat $OBJ/sshd_proxy.orig ; echo "ChannelTimeout session:*=1") \
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> $OBJ/sshd_proxy
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${SSH} -F $OBJ/ssh_proxy somehost "sleep 5 ; exit 23"
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r=$?
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if [ $r -ne 255 ]; then
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fail "ssh returned unexpected error code $r"
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fi
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verbose "command irrelevant timeout"
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(cat $OBJ/sshd_proxy.orig ; echo "ChannelTimeout session:shell=1") \
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> $OBJ/sshd_proxy
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${SSH} -F $OBJ/ssh_proxy somehost "sleep 5 ; exit 23"
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r=$?
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if [ $r -ne 23 ]; then
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fail "ssh failed"
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fi
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# Set up a "slow sftp server" that sleeps before executing the real one.
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cat > $OBJ/slow-sftp-server.sh << _EOF
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#!/bin/sh
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sleep 5
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$SFTPSERVER
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_EOF
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chmod a+x $OBJ/slow-sftp-server.sh
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verbose "sftp no timeout"
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(grep -vi subsystem.*sftp $OBJ/sshd_proxy.orig;
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echo "Subsystem sftp $OBJ/slow-sftp-server.sh" ) > $OBJ/sshd_proxy
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rm -f ${COPY}
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$SFTP -qS $SSH -F $OBJ/ssh_proxy somehost:$DATA $COPY
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r=$?
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if [ $r -ne 0 ]; then
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fail "sftp failed"
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fi
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cmp $DATA $COPY || fail "corrupted copy"
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verbose "sftp timeout"
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(grep -vi subsystem.*sftp $OBJ/sshd_proxy.orig;
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echo "ChannelTimeout session:subsystem:sftp=1" ;
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echo "Subsystem sftp $OBJ/slow-sftp-server.sh" ) > $OBJ/sshd_proxy
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rm -f ${COPY}
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$SFTP -qS $SSH -F $OBJ/ssh_proxy somehost:$DATA $COPY
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r=$?
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if [ $r -eq 0 ]; then
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fail "sftp succeeded unexpectedly"
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fi
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test -f $COPY && cmp $DATA $COPY && fail "intact copy"
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verbose "sftp irrelevant timeout"
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(grep -vi subsystem.*sftp $OBJ/sshd_proxy.orig;
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echo "ChannelTimeout session:subsystem:command=1" ;
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echo "Subsystem sftp $OBJ/slow-sftp-server.sh" ) > $OBJ/sshd_proxy
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rm -f ${COPY}
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$SFTP -qS $SSH -F $OBJ/ssh_proxy somehost:$DATA $COPY
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r=$?
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if [ $r -ne 0 ]; then
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fail "sftp failed"
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fi
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cmp $DATA $COPY || fail "corrupted copy"
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