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ssh: Enable ForwardX11Trusted, returning to earlier semantics which cause
fewer problems with existing setups (http://bugs.debian.org/237021).
ssh: Set 'SendEnv LANG LC_*' by default (http://bugs.debian.org/264024).
ssh: Enable HashKnownHosts by default to try to limit the spread of ssh
worms.
ssh: Enable GSSAPIAuthentication and disable GSSAPIDelegateCredentials by
default.
Document all of this, along with several sshd defaults set in
debian/openssh-server.postinst.
Author: Russ Allbery <rra@debian.org>
Forwarded: not-needed
Last-Update: 2015-12-07
Patch-Name: debian-config.patch
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Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1727
Bug-Debian: http://bugs.debian.org/430154
Last-Update: 2013-09-14
Patch-Name: doc-hash-tab-completion.patch
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Allow secure files (~/.ssh/config, ~/.ssh/authorized_keys, etc.) to be
group-writable, provided that the group in question contains only the file's
owner. Rejected upstream for IMO incorrect reasons (e.g. a misunderstanding
about the contents of gr->gr_mem). Given that per-user groups and umask 002
are the default setup in Debian (for good reasons - this makes operating in
setgid directories with other groups much easier), we need to permit this by
default.
Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1060
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=314347
Last-Update: 2013-09-14
Patch-Name: user-group-modes.patch
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Add compatibility aliases for ProtocolKeepAlives and SetupTimeOut, supported
in previous versions of Debian's OpenSSH package but since superseded by
ServerAliveInterval. (We're probably stuck with this bit for
compatibility.)
In batch mode, default ServerAliveInterval to five minutes.
Adjust documentation to match and to give some more advice on use of
keepalives.
Author: Ian Jackson <ian@chiark.greenend.org.uk>
Author: Matthew Vernon <matthew@debian.org>
Author: Colin Watson <cjwatson@debian.org>
Last-Update: 2015-11-29
Patch-Name: keepalive-extensions.patch
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This patch has been rejected upstream: "None of the OpenSSH developers are
in favour of adding this, and this situation has not changed for several
years. This is not a slight on Simon's patch, which is of fine quality, but
just that a) we don't trust GSSAPI implementations that much and b) we don't
like adding new KEX since they are pre-auth attack surface. This one is
particularly scary, since it requires hooks out to typically root-owned
system resources."
However, quite a lot of people rely on this in Debian, and it's better to
have it merged into the main openssh package rather than having separate
-krb5 packages (as we used to have). It seems to have a generally good
security history.
Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1242
Last-Updated: 2015-11-29
Patch-Name: gssapi.patch
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match myproposal.h order; from brian conway (i snuck in a
tweak while here)
ok dtucker
Upstream-ID: 35174a19b5237ea36aa3798f042bf5933b772c67
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Allow ssh_config and sshd_config kex parameters options be
prefixed by a '+' to indicate that the specified items be appended to the
default rather than replacing it.
approach suggested by dtucker@, feedback dlg@, ok markus@
Upstream-ID: 0f901137298fc17095d5756ff1561a7028e8882a
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Turn off DSA by default; add HostKeyAlgorithms to the
server and PubkeyAcceptedKeyTypes to the client side, so it still can be
tested or turned back on; feedback and ok djm@
Upstream-ID: 8450a9e6d83f80c9bfed864ff061dfc9323cec21
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turn off 1024 bit diffie-hellman-group1-sha1 key
exchange method (already off in server, this turns it off in the client by
default too) ok dtucker@
Upstream-ID: f59b88f449210ab7acf7d9d88f20f1daee97a4fa
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mention CheckHostIP adding addresses to known_hosts;
bz#1993; ok dtucker@
Upstream-ID: fd44b68440fd0dc29abf9f2d3f703d74a2396cb7
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Fix typo (keywork->keyword)
Upstream-ID: 8aacd0f4089c0a244cf43417f4f9045dfaeab534
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Reorder client proposal to prefer
diffie-hellman-group-exchange-sha1 over diffie-hellman-group14-sha1. ok djm@
Upstream-ID: 552c08d47347c3ee1a9a57d88441ab50abe17058
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enviroment -> environment: apologies to darren for not
spotting that first time round...
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Document that the TERM environment variable is not
subject to SendEnv and AcceptEnv. bz#2386, based loosely on a patch from
jjelen at redhat, help and ok jmc@
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ssh-askpass(1) is the default, overridden by SSH_ASKPASS;
diff originally from jiri b;
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UpdateHostKeys fixes:
I accidentally changed the format of the hostkeys@openssh.com messages
last week without changing the extension name, and this has been causing
connection failures for people who are running -current. First reported
by sthen@
s/hostkeys@openssh.com/hostkeys-00@openssh.com/
Change the name of the proof message too, and reorder it a little.
Also, UpdateHostKeys=ask is incompatible with ControlPersist (no TTY
available to read the response) so disable UpdateHostKeys if it is in
ask mode and ControlPersist is active (and document this)
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Revise hostkeys@openssh.com hostkey learning extension.
The client will not ask the server to prove ownership of the private
halves of any hitherto-unseen hostkeys it offers to the client.
Allow UpdateHostKeys option to take an 'ask' argument to let the
user manually review keys offered.
ok markus@
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turn UpdateHostkeys off by default until I figure out
mlarkin@'s warning message; requested by deraadt@
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Add a ssh_config HostbasedKeyType option to control which
host public key types are tried during hostbased authentication.
This may be used to prevent too many keys being sent to the server,
and blowing past its MaxAuthTries limit.
bz#2211 based on patch by Iain Morgan; ok markus@
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correct description of UpdateHostKeys in ssh_config.5 and
add it to -o lists for ssh, scp and sftp; pointed out by jmc@
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Host key rotation support.
Add a hostkeys@openssh.com protocol extension (global request) for
a server to inform a client of all its available host key after
authentication has completed. The client may record the keys in
known_hosts, allowing it to upgrade to better host key algorithms
and a server to gracefully rotate its keys.
The client side of this is controlled by a UpdateHostkeys config
option (default on).
ok markus@
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tweak previous;
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mention ssh -Q feature to list supported { MAC, cipher,
KEX, key } algorithms in more places and include the query string used to
list the relevant information; bz#2288
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document FingerprintHash here too
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add RevokedHostKeys option for the client
Allow textfile or KRL-based revocation of hostkeys.
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mux-related manual tweaks
mention ControlPersist=0 is the same as ControlPersist=yes
recommend that ControlPath sockets be placed in a og-w directory
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tweak previous;
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Tweak config reparsing with host canonicalisation
Make the second pass through the config files always run when
hostname canonicalisation is enabled.
Add a "Match canonical" criteria that allows ssh_config Match
blocks to trigger only in the second config pass.
Add a -G option to ssh that causes it to parse its configuration
and dump the result to stdout, similar to "sshd -T"
Allow ssh_config Port options set in the second config parse
phase to be applied (they were being ignored).
bz#2267 bz#2286; ok markus
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improve capitalization for the Ed25519 public-key
signature system.
ok djm@
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[PROTOCOL auth-options.c auth-passwd.c auth-rh-rsa.c auth-rhosts.c]
[auth-rsa.c auth.c auth1.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
[auth2-passwd.c auth2-pubkey.c auth2.c canohost.c channels.c channels.h]
[clientloop.c misc.c misc.h monitor.c mux.c packet.c readconf.c]
[readconf.h servconf.c servconf.h serverloop.c session.c ssh-agent.c]
[ssh.c ssh_config.5 sshconnect.c sshconnect1.c sshconnect2.c sshd.c]
[sshd_config.5 sshlogin.c]
Add support for Unix domain socket forwarding. A remote TCP port
may be forwarded to a local Unix domain socket and vice versa or
both ends may be a Unix domain socket. This is a reimplementation
of the streamlocal patches by William Ahern from:
http://www.25thandclement.com/~william/projects/streamlocal.html
OK djm@ markus@
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[ssh_config.5]
mention that ProxyCommand is executed using shell "exec" to avoid
a lingering process; bz#1977
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[ssh_config.5]
escape %C since groff thinks it part of an Rs/Re block;
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[ssh.c ssh_config.5]
Add a %C escape sequence for LocalCommand and ControlPath that expands
to a unique identifer based on a has of the tuple of (local host,
remote user, hostname, port).
Helps avoid exceeding sockaddr_un's miserly pathname limits for mux
control paths.
bz#2220, based on patch from mancha1 AT zoho.com; ok markus@
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[ssh_config.5]
mention '%%' escape sequence in HostName directives and how it may
be used to specify IPv6 link-local addresses
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[ssh_config.5 sshd_config.5]
sync available and default algorithms, improve algorithm list formatting
help from jmc@ and schwarze@, ok deraadt@
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[readconf.c readconf.h ssh.c ssh_config.5]
reparse ssh_config and ~/.ssh/config if hostname canonicalisation changes
the hostname. This allows users to write configurations that always
refer to canonical hostnames, e.g.
CanonicalizeHostname yes
CanonicalDomains int.example.org example.org
CanonicalizeFallbackLocal no
Host *.int.example.org
Compression off
Host *.example.org
User djm
ok markus@
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[ssh_config.5]
fix inverted meaning of 'no' and 'yes' for CanonicalizeFallbackLocal
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[ssh-add.1 ssh-agent.1 ssh-keygen.1 ssh-keyscan.1 ssh-keysign.8 ssh.1]
[ssh_config.5 sshd.8 sshd_config.5]
add missing mentions of ed25519; ok djm@
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[authfd.c authfile.c key.c key.h myproposal.h pathnames.h readconf.c]
[servconf.c ssh-agent.c ssh-keygen.c ssh-keyscan.1 ssh-keyscan.c]
[ssh-keysign.c ssh.c ssh_config.5 sshd.8 sshd.c verify.c ssh-ed25519.c]
[sc25519.h sc25519.c hash.c ge25519_base.data ge25519.h ge25519.c]
[fe25519.h fe25519.c ed25519.c crypto_api.h blocks.c]
support ed25519 keys (hostkeys and user identities) using the public
domain ed25519 reference code from SUPERCOP, see
http://ed25519.cr.yp.to/software.html
feedback, help & ok djm@
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[ssh_config.5 sshd_config.5]
no need for .Pp before displays;
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[Makefile.in PROTOCOL PROTOCOL.chacha20poly1305 authfile.c chacha.c]
[chacha.h cipher-chachapoly.c cipher-chachapoly.h cipher.c cipher.h]
[dh.c myproposal.h packet.c poly1305.c poly1305.h servconf.c ssh.1]
[ssh.c ssh_config.5 sshd_config.5] Add a new protocol 2 transport
cipher "chacha20-poly1305@openssh.com" that combines Daniel
Bernstein's ChaCha20 stream cipher and Poly1305 MAC to build an
authenticated encryption mode.
Inspired by and similar to Adam Langley's proposal for TLS:
http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-03
but differs in layout used for the MAC calculation and the use of a
second ChaCha20 instance to separately encrypt packet lengths.
Details are in the PROTOCOL.chacha20poly1305 file.
Feedback markus@, naddy@; manpage bits Loganden Velvindron @ AfriNIC
ok markus@ naddy@
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[ssh_config.5 sshd_config.5]
the default kex is now curve25519-sha256@libssh.org
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[readconf.c servconf.c ssh_config.5 sshd_config.5]
Disallow empty Match statements and add "Match all" which matches
everything. ok djm, man page help jmc@
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[ssh_config.5]
tweak the "exec" description, as worded by djm;
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[readconf.c ssh_config.5]
rename "command" subclause of the recently-added "Match" keyword to
"exec"; it's shorter, clearer in intent and we might want to add the
ability to match against the command being executed at the remote end in
the future.
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[ssh_config.5]
document % expansions performed by "Match command ..."
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[ssh.c ssh_config.5]
one I missed in previous: s/isation/ization/
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[readconf.c readconf.h ssh.1 ssh.c ssh_config.5]
s/canonicalise/canonicalize/ for consistency with existing spelling,
e.g. authorized_keys; pointed out by naddy@
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[ssh_config.5]
tweak previous;
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[readconf.c readconf.h roaming_client.c ssh.1 ssh.c ssh_config.5]
[sshconnect.c sshconnect.h]
Implement client-side hostname canonicalisation to allow an explicit
search path of domain suffixes to use to convert unqualified host names
to fully-qualified ones for host key matching.
This is particularly useful for host certificates, which would otherwise
need to list unqualified names alongside fully-qualified ones (and this
causes a number of problems).
"looks fine" markus@
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