===================================================================
RCS file: /cvsrepo/anoncvs/cvs/www/68.html,v
retrieving revision 1.41
retrieving revision 1.42
diff -u -r1.41 -r1.42
--- www/68.html 2020/10/04 22:12:48 1.41
+++ www/68.html 2020/10/04 23:23:55 1.42
@@ -504,96 +504,77 @@
- Potentially incompatible changes.
-
- For FIDO/U2F support, OpenSSH recommends the use of libfido2
1.5.0 or greater. Older libraries have limited support at the expense
of disabling particular features. These include resident keys, PIN-
required keys and multiple attached tokens.
-
- ssh-keygen(1):
the format of the attestation information optionally recorded when a
FIDO key is generated has changed. It now includes the authenticator
data needed to validate attestation signatures.
-
- The API between OpenSSH and the FIDO token middleware has
changed and the SSH_SK_VERSION_MAJOR version has been incremented as a
result. Third-party middleware libraries must support the current API
version (7) to work with OpenSSH 8.4.
-
- The portable OpenSSH distribution now requires automake to
rebuild the configure script and supporting files. This is not
required when simply building portable OpenSSH from a release tar
file.
-
- New Features
-
- ssh(1), ssh-keygen">ssh-keygen(1):
support for FIDO keys that require a PIN for each use. These keys may
be generated using ssh-keygen using a new "verify-required" option.
When a PIN-required key is used, the user will be prompted for a PIN
to complete the signature operation.
-
- sshd(8):
authorized_keys now supports a new "verify-required" option to require
FIDO signatures assert that the token verified that the user was
present before making the signature. The FIDO protocol supports
multiple methods for user-verification, but currently OpenSSH only
supports PIN verification.
-
- sshd(8), ssh-keygen(1): add
support for verifying FIDO webauthn signatures. Webauthn is a standard
for using FIDO keys in web browsers. These signatures are a slightly
different format to plain FIDO signatures and thus require explicit
support.
-
- ssh(1): allow some
keywords to expand shell-style ${ENV} environment variables. The
supported keywords are CertificateFile, ControlPath, IdentityAgent and
IdentityFile, plus LocalForward and RemoteForward when used for Unix
domain socket paths.
-
- ssh(1), ssh-agent(1): allow some
additional control over the use of ssh-askpass via a new
$SSH_ASKPASS_REQUIRE environment variable, including forcibly enabling
and disabling its use.
-
- ssh(1): allow ssh_config(5)'s
AddKeysToAgent keyword accept a time limit for keys in addition to its
current flag options. Time- limited keys will automatically be removed
from ssh-agent after their expiry time has passed.
-
- scp(1), sftp(1): allow the -A flag to
explicitly enable agent forwarding in scp and sftp. The default
remains to not forward an agent, even when ssh_config enables it.
-
- ssh(1): add a '%k'
TOKEN that expands to the effective HostKey of the destination. This
allows, e.g., keeping host keys in individual files using
"UserKnownHostsFile ~/.ssh/known_hosts.d/%k".
-
- ssh-keygen(1):
allow "ssh-add -d -" to read keys to be deleted from stdin.
-
- sshd(8): improve
logging for MaxStartups connection throttling. sshd will now log when
it starts and stops throttling and periodically while in this state.
-
-
- Bugfixes
-
- ssh(1), ssh-keygen(1): better
support for multiple attached FIDO tokens. In cases where OpenSSH
@@ -603,114 +584,90 @@
wrong PIN to the wrong token and incrementing the token's PIN failure
counter (tokens effectively erase their keys after too many PIN
failures).
-
- sshd(8): fix Include
before Match in sshd_config(5).
-
- ssh(1): close
stdin/out/error when forking after authentication completes ("ssh -f
...").
-
- ssh(1), sshd(8): limit the amount of
channel input data buffered, avoiding peers that advertise large
windows but are slow to read from causing high memory consumption.
-
- ssh-agent(1):
handle multiple requests sent in a single write() to the agent.
-
- sshd(8): allow sshd_config(5) longer than 256k
-
- sshd(8): avoid
spurious "Unable to load host key" message when sshd load a private
key but no public counterpart
-
- ssh(1): prefer the
default hostkey algorithm list whenever we have a hostkey that matches
its best-preference algorithm.
-
- sshd(1): when
ordering the hostkey algorithms to request from a server, prefer
certificate types if the known_hosts files contain a key marked as a
@cert-authority;
-
- ssh(1): perform host
key fingerprint comparisons for the "Are you sure you want to continue
connecting (yes/no/[fingerprint])?" prompt with case sensitivity.
-
- sshd(8): ensure that
address/masklen mismatches in sshd_config yield fatal errors at daemon
start time rather than later when they are evaluated.
-
- ssh-keygen(1):
ensure that certificate extensions are lexically sorted. Previously if
the user specified a custom extension then the everything would be in
order except the custom ones.
-
- ssh(1): also compare
username when checking for JumpHost loops.
-
- ssh-keygen(1):
preserve group/world read permission on known_hosts files across runs
of "ssh-keygen -Rf /path". The old behaviour was to remove all rights
for group/other.
-
-
- ssh-keygen(1):
+
- ssh-keygen(1):
Mention the [-a rounds] flag in the ssh-keygen manual page and
usage().
-
- sshd(8): explicitly construct path to ~/.ssh/rc rather than
relying on it being relative to the current directory, so that it
can still be found if the shell startup changes its directory.
-
- sshd(8): when
redirecting sshd's log output to a file, undo this redirection after
the session child process is forked(). Fixes missing log messages when
using this feature under some circumstances.
-
- sshd(8): start
ClientAliveInterval bookkeeping before first pass through select()
loop; fixed theoretical case where busy sshd may ignore timeouts from
client.
-
- ssh(1): only reset the
ServerAliveInterval check when we receive traffic from the server and
ignore traffic from a port forwarding client, preventing a client from
keeping a connection alive when it should be terminated.
-
- ssh-keygen(1):
avoid spurious error message when ssh-keygen creates files outside
~/.ssh
-
- sftp-client(1): fix
off-by-one error that caused sftp downloads to make one more
concurrent request that desired. This prevented using sftp(1) in unpipelined
request/response mode, which is useful when debugging.
-
- ssh(1), sshd(8): handle EINTR in
waitfd() and timeout_connect() helpers.
-
- ssh(1), ssh-keygen(1): defer
creation of ~/.ssh until we attempt to write to it so we don't leave
an empty .ssh directory when it's not needed.
-
- ssh(1), sshd(8): fix multiplier when
parsing time specifications when handling seconds after other units.
-
Ports and packages:
The package system provides an easy way to install 3rd party software. New features include:
Many pre-built packages for each architecture: