OPEN during SSH transport rekeying. The most visible benefit is that it
should make ~-escapes work in the client (e.g. to exit) if the connection
happened to have stalled during a rekey event. Based work by and ok dtucker@
OpenBSD-Commit-ID: a66e8f254e92edd4ce09c9f750883ec8f1ea5f45
a fd directly into the transport input buffer.
Use this in the client and server mainloops to avoid unnecessary
copying. It also lets us use a more greedy read size without penalty.
Yields a 2-3% performance gain on cipher-speed.sh (in a fairly
unscientific test tbf)
feedback dtucker@ ok markus@
OpenBSD-Commit-ID: df4112125bf79d8e38e79a77113e1b373078e632
UpdateHostkeys on the server side. The previous code tried to prefer RSA/SHA2
for hostkey proofs of RSA keys, but missed some cases. This will use RSA/SHA2
signatures for RSA keys if the client proposed these algorithms in initial
KEX. bz3375
Mostly by Dmitry Belyavskiy with some tweaks by me.
ok markus@
OpenBSD-Commit-ID: c17ba0c3236340d2c6a248158ebed042ac6a8029
client and server mainloops.
Previously the rekey timeout could expire but rekeying would not start
until a packet was sent or received. This could cause us to spin in
select() on the rekey timeout if the connection was quiet.
ok markus@
OpenBSD-Commit-ID: 4356cf50d7900f3df0a8f2117d9e07c91b9ff987
Previously sshd's SIGCHLD handler would wake up select() by writing a
byte to notify_pipe. We can remove this by blocking SIGCHLD, checking
for child terminations then passing the original signal mask through
to pselect. This ensures that the pselect will immediately wake up if
a child terminates between wait()ing on them and the pselect.
In -portable, for platforms that do not have pselect the kludge is still
there but is hidden behind a pselect interface.
Based on other changes for bz#2158, ok djm@
OpenBSD-Commit-ID: 202c85de0b3bdf1744fe53529a05404c5480d813
openssh-8.5 introduced a regression that would cause sshd to exit
because of transient read errors on the network socket (e.g. EINTR,
EAGAIN). Reported by balu.gajjala AT gmail.com via bz3297
through select() loop; fixed theoretical case where busy sshd may ignore
timeouts from client; inspired by and ok dtucker
OpenBSD-Commit-ID: 96bfc4b1f86c7da313882a84755b2b47eb31957f
ssh_packet_write_poll() failures here too as the former yields better error
messages; ok dtucker@
OpenBSD-Commit-ID: 1f7a6ca95bc2b716c2e948fc1370753be772d8e3
connection killing behaviour, rather than killing the connection after
sending the first liveness test probe (regardless of whether the client was
responsive) bz2627; ok markus
OpenBSD-Commit-ID: 5af79c35f4c9fa280643b6852f524bfcd9bccdaf
> revision 1.217
> date: 2019/11/27 03:34:04; author: dtucker; state: Exp; lines: +5 -7; commitid: wkiMn49XJyjzoJIs;
> Make channel_id u_int32_t and remove unnecessary check and cast that were
> left over from the type conversion. Noted by t-hashida@amiya.co.jp in
> bz#3098, ok markus@ djm@
Darren was right the first time; ok dtucker@ "agreed" markus@
OpenBSD-Commit-ID: 641dd1b99a6bbd85b7160da462ae1be83432c7c8
sigaction(2). This wrapper blocks all other signals during the handler
preventing races between handlers, and sets SA_RESTART which should reduce
the potential for short read/write operations.
OpenBSD-Commit-ID: 5e047663fd77a40d7b07bdabe68529df51fd2519
and cast that were left over from the type conversion. Noted by
t-hashida@amiya.co.jp in bz#3098, ok markus@ djm@
OpenBSD-Commit-ID: 3ad105b6a905284e780b1fd7ff118e1c346e90b5
some arbitrary value < 0. errno is only updated in this case. Change all
(most?) callers of syscalls to follow this better, and let's see if this
strictness helps us in the future.
OpenBSD-Commit-ID: 48081f00db7518e3b712a49dca06efc2a5428075
that could cause connection to close incorrectly; Report and patch from Jakub
Jelen in bz#2757; ok dtucker@ markus@
OpenBSD-Commit-ID: 17229a8a65bd8e6c2080318ec2b7a61e1aede3fb
sending two keepalives successively and prematurely terminating connection
when ClientAliveCount=1. While there, collapse two similar tests into one.
ok markus@
OpenBSD-Commit-ID: 043670d201dfe222537a2a4bed16ce1087de5ddd
sshpkt_error(). The first one logs the error and exits (what we want) instead
of just logging and blundering on.
OpenBSD-Commit-ID: 39f51b43641dce9ce0f408ea6c0e6e077e2e91ae
API, started almost exactly six years ago.
This change stops including the old packet_* API by default and makes
each file that requires the old API include it explicitly. We will
commit file-by-file refactoring to remove the old API in consistent
steps.
with & ok markus@
OpenBSD-Commit-ID: 93c98a6b38f6911fd1ae025a1ec57807fb4d4ef4
cannot be setuid and sshd always has privsep on, we can remove the uid checks
for low port binds and just let the system do the check. We leave a sanity
check for the !privsep case so long as the code is stil there. with & ok
djm@
OpenBSD-Commit-ID: 9535cfdbd1cd54486fdbedfaee44ce4367ec7ca0
remove the legacy one.
Includes a fairly big refactor of auth2-pubkey.c to retain less state
between key file lines.
feedback and ok markus@
OpenBSD-Commit-ID: dece6cae0f47751b9892080eb13d6625599573df
These seem to have been missed during the replacement of mysignal
with #define signal in commit 5ade9ab. Both include the requisite
headers to pick up the #define.
The signal handlers from the original ssh1 code on which OpenSSH
is based assume unreliable signals and reinstall their handlers.
Since OpenBSD (and pretty much every current system) has reliable
signals this is not needed. In the unlikely even that -portable
is still being used on such systems we will deal with it in the
compat layer. ok deraadt@
OpenBSD-Commit-ID: f53a1015cb6908431b92116130d285d71589612c
Drop compatibility hacks for some ancient SSH
implementations, including ssh.com <=2.* and OpenSSH <= 3.*.
These versions were all released in or before 2001 and predate the
final SSH RFCs. The hacks in question aren't necessary for RFC-
compliant SSH implementations.
ok markus@
OpenBSD-Commit-ID: 4be81c67db57647f907f4e881fb9341448606138
unbreak hostkey rotation; attempting to sign with a
desired signature algorithm of kex->hostkey_alg is incorrect when the key
type isn't capable of making those signatures. ok markus@
OpenBSD-Commit-ID: 35ae46864e1f5859831ec0d115ee5ea50953a906
pass negotiated signing algorithm though to
sshkey_verify() and check that the negotiated algorithm matches the type in
the signature (only matters for RSA SHA1/SHA2 sigs). ok markus@
OpenBSD-Commit-ID: 735fb15bf4adc060d3bee9d047a4bcaaa81b1af9
Put remote client info back into the ClientAlive
connection termination message. Based in part on diff from lars.nooden at
gmail, ok djm
OpenBSD-Commit-ID: 80a0f619a29bbf2f32eb5297a69978a0e05d0ee0
Expose devices allocated for tun/tap forwarding.
At the client, the device may be obtained from a new %T expansion
for LocalCommand.
At the server, the allocated devices will be listed in a
SSH_TUNNEL variable exposed to the environment of any user sessions
started after the tunnel forwarding was established.
ok markus
Upstream-ID: e61e53f8ae80566e9ddc0d67a5df5bdf2f3c9f9e
Make remote channel ID a u_int
Previously we tracked the remote channel IDs in an int, but this is
strictly incorrect: the wire protocol uses uint32 and there is nothing
in-principle stopping a SSH implementation from sending, say, 0xffff0000.
In practice everyone numbers their channels sequentially, so this has
never been a problem.
ok markus@
Upstream-ID: b9f4cd3dc53155b4a5c995c0adba7da760d03e73
refactor channels.c
Move static state to a "struct ssh_channels" that is allocated at
runtime and tracked as a member of struct ssh.
Explicitly pass "struct ssh" to all channels functions.
Replace use of the legacy packet APIs in channels.c.
Rework sshd_config PermitOpen handling: previously the configuration
parser would call directly into the channels layer. After the refactor
this is not possible, as the channels structures are allocated at
connection time and aren't available when the configuration is parsed.
The server config parser now tracks PermitOpen itself and explicitly
configures the channels code later.
ok markus@
Upstream-ID: 11828f161656b965cc306576422613614bea2d8f
Tweak previous keepalive commit: if last_time + keepalive
<= now instead of just "<" so client_alive_check will fire if the select
happens to return on exact second of the timeout. ok djm@
Upstream-ID: e02756bd6038d11bb8522bfd75a4761c3a684fcc
Keep track of the last time we actually heard from the
client and use this to also schedule a client_alive_check(). Prevents
activity on a forwarded port from indefinitely preventing the select timeout
so that client_alive_check() will eventually (although not optimally) be
called.
Analysis by willchan at google com via bz#2756, feedback & ok djm@
Upstream-ID: c08721e0bbda55c6d18e2760f3fe1b17fb71169e
Return true reason for port forwarding failures where
feasible rather than always "administratively prohibited". bz#2674, ok djm@
Upstream-ID: d901d9887951774e604ca970e1827afaaef9e419
Add a sshd_config DisableForwaring option that disables
X11, agent, TCP, tunnel and Unix domain socket forwarding, as well as
anything else we might implement in the future.
This, like the 'restrict' authorized_keys flag, is intended to be a
simple and future-proof way of restricting an account. Suggested as
a complement to 'restrict' by Jann Horn; ok markus@
Upstream-ID: 203803f66e533a474086b38a59ceb4cf2410fcf7
djm@openbsd.org
Darren Tucker
dtucker@openbsd.org
Damien Miller
deraadt@openbsd.org
markus@openbsd.org