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version 1.49, 2022/04/15 04:57:20

version 1.50, 2022/04/15 05:31:17

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<li>Security

<ul>

<li>Near miss in sshd(8):

<li>Near miss in <a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

fix an integer overflow in the user authentication path

that, in conjunction with other logic errors, could have yielded

unauthenticated access under difficult to exploit conditions.<br>

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<li>New features

<ul>

<li>ssh(1), sshd(8), ssh-add(1), ssh-agent(1): add a system for

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

restricting forwarding and use of keys added to ssh-agent(1)

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>,

<a href=https://man.openbsd.org/ssh-add.1>ssh-add(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

add a system for restricting forwarding and use of keys added to

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>

A detailed description of the feature is available at

https://www.openssh.com/agent-restrict.html and the protocol

extensions are documented in the PROTOCOL and PROTOCOL.agent

files in the source release.

<li>ssh(1), sshd(8): add the sntrup761x25519-sha512@openssh.com hybrid

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

add the sntrup761x25519-sha512@openssh.com hybrid

ECDH/x25519 + Streamlined NTRU Prime post-quantum KEX to the

default KEXAlgorithms list (after the ECDH methods but before the

prime-group DH ones).

<li>ssh-keygen(1): when downloading resident keys from a FIDO token,

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

when downloading resident keys from a FIDO token,

pass back the user ID that was used when the key was created and

append it to the filename the key is written to (if it is not the

default). Avoids keys being clobbered if the user created multiple

resident keys with the same application string but different user

IDs.

<li>ssh-keygen(1), ssh(1), ssh-agent(1): better handling for FIDO keys

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>,

<a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

better handling for FIDO keys

on tokens that provide user verification (UV) on the device itself,

including biometric keys, avoiding unnecessary PIN prompts.

<li>ssh-keygen(1): add "ssh-keygen -Y match-principals" operation to

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>: add "ssh-keygen -Y match-principals" operation to

perform matching of principals names against an allowed signers

file. To be used towards a TOFU model for SSH signatures in git.

<li>ssh-add(1), ssh-agent(1): allow pin-required FIDO keys to be added

<li><a href=https://man.openbsd.org/ssh-add.1>ssh-add(1)</a>,

to ssh-agent(1). $SSH_ASKPASS will be used to request the PIN at

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

authentication time.

allow pin-required FIDO keys to be added

<li>ssh-keygen(1): allow selection of hash at sshsig signing time

to <a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>.

$SSH_ASKPASS will be used to request the PIN at authentication time.

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

allow selection of hash at sshsig signing time

(either sha512 (default) or sha256).

<li>ssh(1), sshd(8): read network data directly to the packet input

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

read network data directly to the packet input

buffer instead of indirectly via a small stack buffer. Provides a

modest performance improvement.

<li>ssh(1), sshd(8): read data directly to the channel input buffer,

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

read data directly to the channel input buffer,

providing a similar modest performance improvement.

<li>ssh(1): extend the PubkeyAuthentication configuration directive to

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>:

extend the PubkeyAuthentication configuration directive to

accept yes|no|unbound|host-bound to allow control over one of the

protocol extensions used to implement agent-restricted keys.

<li>ssh(1), sshd(8): use the hybrid Streamlined NTRU Prime + x25519 key

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

use the hybrid Streamlined NTRU Prime + x25519 key

exchange method by default ("sntrup761x25519-sha512@openssh.com").

The NTRU algorithm is believed to resist attacks enabled by future

quantum computers and is paired with the X25519 ECDH key exchange

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later" attacks where an adversary who can record and store SSH

session ciphertext would be able to decrypt it once a sufficiently

advanced quantum computer is available.

<li>sftp-server(8): support the "copy-data" extension to allow server-

<li><a href=https://man.openbsd.org/sftp-server.8>sftp-server(8)</a>:

support the "copy-data" extension to allow server-

side copying of files/data, following the design in

draft-ietf-secsh-filexfer-extensions-00.

<li>sftp(1): add a "cp" command to allow the sftp client to perform

<li><a href=https://man.openbsd.org/sftp.1>sftp(1)</a>:

add a "cp" command to allow the sftp client to perform

server-side file copies.

</ul>

<li>Bugfixes

<ul>

<li>sshd(8): document that CASignatureAlgorithms, ExposeAuthInfo and

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

document that CASignatureAlgorithms, ExposeAuthInfo and

PubkeyAuthOptions can be used in a Match block.

<li>sshd(8): fix possible string truncation when constructing paths to

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

fix possible string truncation when constructing paths to

.rhosts/.shosts files with very long user home directory names.

<li>ssh-keysign(1): unbreak for KEX algorithms that use SHA384/512

exchange hashes

<li>ssh(1): don't put the TTY into raw mode when SessionType=none,

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>:

don't put the TTY into raw mode when SessionType=none,

avoids ^C being unable to kill such a session.

<li>scp(1): fix some corner-case bugs in SFTP-mode handling of

<li><a href=https://man.openbsd.org/scp.1>scp(1)</a>:

fix some corner-case bugs in SFTP-mode handling of

~-prefixed paths.

<li>ssh(1): unbreak hostbased auth using RSA keys. Allow ssh(1) to

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>:

unbreak hostbased auth using RSA keys. Allow

<a href=https://man.openbsd.org/ssh.1>ssh(1)</a> to

select RSA keys when only RSA/SHA2 signature algorithms are

configured (this is the default case). Previously RSA keys were

not being considered in the default case.

<li>ssh-keysign(1): make ssh-keysign use the requested signature

algorithm and not the default for the key type. Part of unbreaking

hostbased auth for RSA/SHA2 keys.

<li>ssh(1): stricter UpdateHostkey signature verification logic on

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>:

stricter UpdateHostkey signature verification logic on

the client- side. Require RSA/SHA2 signatures for RSA hostkeys

except when RSA/SHA1 was explicitly negotiated during initial

KEX

<li>ssh(1), sshd(8): fix signature algorithm selection logic for

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

fix signature algorithm selection logic for

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.

<li>All: convert all uses of select(2)/pselect(2) to poll(2)/ppoll(2).

This includes the mainloops in ssh(1), ssh-agent(1), ssh-agent(1)

This includes the mainloops in

and sftp-server(8), as well as the sshd(8) listen loop and all

<a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>

and <a href=https://man.openbsd.org/sftp-server.8>sftp-server(8)</a>,

as well as the <a href=https://man.openbsd.org/sshd.8>sshd(8)</a>

listen loop and all

other FD read/writability checks. On platforms with missing or

broken poll(2)/ppoll(2) syscalls a select(2)-based compat shim is

available.

<li>ssh-keygen(1): the "-Y find-principals" command was verifying key

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

the "-Y find-principals" command was verifying key

validity when using ca certs but not with simple key lifetimes

within the allowed signers file.

<li>ssh-keygen(1): make sshsig verify-time argument parsing optional

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

<li>sshd(8): fix truncation in rhosts/shosts path construction.

make sshsig verify-time argument parsing optional

<li>ssh(1), ssh-agent(1): avoid xmalloc(0) for PKCS#11 keyid for ECDSA

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

fix truncation in rhosts/shosts path construction.

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

avoid xmalloc(0) for PKCS#11 keyid for ECDSA

keys (we already did this for RSA keys). Avoids fatal errors for

PKCS#11 libraries that return empty keyid, e.g. Microchip ATECC608B

"cryptoauthlib"

<li>ssh(1), ssh-agent(1): improve the testing of credentials against

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

improve the testing of credentials against

inserted FIDO: ask the token whether a particular key belongs to

it in cases where the token supports on-token user-verification

(e.g. biometrics) rather than just assuming that it will accept it.<br>

Will reduce spurious "Confirm user presence" notifications for key

handles that relate to FIDO keys that are not currently inserted in at

least some cases.

<li>ssh(1), sshd(8): correct value for IPTOS_DSCP_LE. It needs to

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

correct value for IPTOS_DSCP_LE. It needs to

allow for the preceding two ECN bits.

<li>ssh-keygen(1): add missing -O option to usage() for the "-Y sign"

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

option.

add missing -O option to usage() for the "-Y sign" option.

<li>ssh-keygen(1): fix a NULL deref when using the find-principals

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

fix a NULL deref when using the find-principals

function, when matching an allowed_signers line that contains a

namespace restriction, but no restriction specified on the

command-line

<li>ssh-agent(1): fix memleak in process_extension(); oss-fuzz

<li><a href=https://man.openbsd.org/ssh-agent.1>ssh-agent(1)</a>:

issue #42719

fix memleak in process_extension(); oss-fuzz issue #42719

<li>ssh(1): suppress "Connection to xxx closed" messages when LogLevel

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>:

suppress "Connection to xxx closed" messages when LogLevel

is set to "error" or above.

<li>ssh(1), sshd(8): use correct zlib flags when inflate(3)-ing

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

compressed packet data.

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

<li>scp(1): when recursively transferring files in SFTP mode, create the

use correct zlib flags when inflate(3)-ing compressed packet data.

destination directory if it doesn't already exist to match scp(1) in

<li><a href=https://man.openbsd.org/scp.1>scp(1)</a>:

when recursively transferring files in SFTP mode, create the

destination directory if it doesn't already exist to match

<a href=https://man.openbsd.org/scp.1>scp(1)</a> in

legacy RCP mode behaviour.

<li>scp(1): many improvements in error message consistency between scp(1)

<li><a href=https://man.openbsd.org/scp.1>scp(1)</a>:

many improvements in error message consistency between

in SFTP mode vs legacy RCP mode.

<li>sshd(8): fix potential race in SIGTERM handling

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

<li>ssh(1), ssh(8): since DSA keys are deprecated, move them to the

fix potential race in SIGTERM handling

end of the default list of public keys so that they will be tried

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

last.

<a href=https://man.openbsd.org/sshd.8>sshd(8))</a>:

<li>ssh-keygen(1): allow 'ssh-keygen -Y find-principals' to match

since DSA keys are deprecated, move them to the end of the default

list of public keys so that they will be tried last.

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

allow 'ssh-keygen -Y find-principals' to match

wildcard principals in allowed_signers files

<li>ssh(1), sshd(8): upstream: fix poll(2) spin when a channel's output

<li><a href=https://man.openbsd.org/ssh.1>ssh(1)</a>,

<a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

upstream: fix poll(2) spin when a channel's output

fd closes without data in the channel buffer.

<li>sshd(8): pack pollfd array in server listen/accept loop. Could

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

pack pollfd array in server listen/accept loop. Could

cause the server to hang/spin when MaxStartups > RLIMIT_NOFILE

<li>ssh-keygen(1): avoid NULL deref via the find-principals and

<li><a href=https://man.openbsd.org/ssh-keygen.1>ssh-keygen(1)</a>:

check-novalidate operations.

avoid NULL deref via the find-principals and check-novalidate operations.

<li>scp(1): fix a memory leak in argument processing.

<li><a href=https://man.openbsd.org/scp.1>scp(1)</a>:

<li>sshd(8): don't try to resolve ListenAddress directives in the sshd

fix a memory leak in argument processing.

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

don't try to resolve ListenAddress directives in the sshd

re-exec path. They are unused after re-exec and parsing errors

(possible for example if the host's network configuration changed)

could prevent connections from being accepted.

<li>sshd(8): when refusing a public key authentication request from a

<li><a href=https://man.openbsd.org/sshd.8>sshd(8)</a>:

when refusing a public key authentication request from a

client for using an unapproved or unsupported signature algorithm

include the algorithm name in the log message to make debugging

easier.