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OpenSSH 7.3p1 is primarily a bugfix release and here is summary.
Changes since OpenSSH 7.2
=========================
Security
--------
* sshd(8): Mitigate a potential denial-of-service attack against
the system's crypt(3) function via sshd(8). An attacker could
send very long passwords that would cause excessive CPU use in
crypt(3). sshd(8) now refuses to accept password authentication
requests of length greater than 1024 characters. Independently
reported by Tomas Kuthan (Oracle), Andres Rojas and Javier Nieto.
* sshd(8): Mitigate timing differences in password authentication
that could be used to discern valid from invalid account names
when long passwords were sent and particular password hashing
algorithms are in use on the server. CVE-2016-6210, reported by
EddieEzra.Harari at verint.com
* ssh(1), sshd(8): Fix observable timing weakness in the CBC padding
oracle countermeasures. Reported by Jean Paul Degabriele, Kenny
Paterson, Torben Hansen and Martin Albrecht. Note that CBC ciphers
are disabled by default and only included for legacy compatibility.
* ssh(1), sshd(8): Improve operation ordering of MAC verification for
Encrypt-then-MAC (EtM) mode transport MAC algorithms to verify the
MAC before decrypting any ciphertext. This removes the possibility
of timing differences leaking facts about the plaintext, though no
such leakage has been observed. Reported by Jean Paul Degabriele,
Kenny Paterson, Torben Hansen and Martin Albrecht.
* sshd(8): (portable only) Ignore PAM environment vars when
UseLogin=yes. If PAM is configured to read user-specified
environment variables and UseLogin=yes in sshd_config, then a
hostile local user may attack /bin/login via LD_PRELOAD or
similar environment variables set via PAM. CVE-2015-8325,
found by Shayan Sadigh.
New Features
------------
* ssh(1): Add a ProxyJump option and corresponding -J command-line
flag to allow simplified indirection through a one or more SSH
bastions or "jump hosts".
* ssh(1): Add an IdentityAgent option to allow specifying specific
agent sockets instead of accepting one from the environment.
* ssh(1): Allow ExitOnForwardFailure and ClearAllForwardings to be
optionally overridden when using ssh -W. bz#2577
* ssh(1), sshd(8): Implement support for the IUTF8 terminal mode as
per draft-sgtatham-secsh-iutf8-00.
* ssh(1), sshd(8): Add support for additional fixed Diffie-Hellman
2K, 4K and 8K groups from draft-ietf-curdle-ssh-kex-sha2-03.
* ssh-keygen(1), ssh(1), sshd(8): support SHA256 and SHA512 RSA
signatures in certificates;
* ssh(1): Add an Include directive for ssh_config(5) files.
* ssh(1): Permit UTF-8 characters in pre-authentication banners sent
from the server. bz#2058
Bugfixes
--------
* ssh(1), sshd(8): Reduce the syslog level of some relatively common
protocol events from LOG_CRIT. bz#2585
* sshd(8): Refuse AuthenticationMethods="" in configurations and
accept AuthenticationMethods=any for the default behaviour of not
requiring multiple authentication. bz#2398
* sshd(8): Remove obsolete and misleading "POSSIBLE BREAK-IN
ATTEMPT!" message when forward and reverse DNS don't match. bz#2585
* ssh(1): Close ControlPersist background process stderr except
in debug mode or when logging to syslog. bz#1988
* misc: Make PROTOCOL description for direct-streamlocal@openssh.com
channel open messages match deployed code. bz#2529
* ssh(1): Deduplicate LocalForward and RemoteForward entries to fix
failures when both ExitOnForwardFailure and hostname
canonicalisation are enabled. bz#2562
* sshd(8): Remove fallback from moduli to obsolete "primes" file
that was deprecated in 2001. bz#2559.
* sshd_config(5): Correct description of UseDNS: it affects ssh
hostname processing for authorized_keys, not known_hosts; bz#2554
* ssh(1): Fix authentication using lone certificate keys in an agent
without corresponding private keys on the filesystem. bz#2550
* sshd(8): Send ClientAliveInterval pings when a time-based
RekeyLimit is set; previously keepalive packets were not being
sent. bz#2252
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original manifest.xml file and the output from "svccfg export".
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Bump PKGREVISION.
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Changes since OpenSSH 7.2p1
===========================
This release fixes a security bug:
* sshd(8): sanitise X11 authentication credentials to avoid xauth
command injection when X11Forwarding is enabled.
Full details of the vulnerability are available at:
http://www.openssh.com/txt/x11fwd.adv
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The ssh_packet_read_poll2 function in packet.c allows remote attackers to
cause a denial of service.
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Fix patch dates and offsets while here. Bump PKGREVISION.
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if ssh_host_key doesn't exist.
RSA1 support is dead and doesn't exist in the package we generate, hence,
regeneration of the key is executed everytime sshd is started/restarted.
Bump PKGREVISION
Reviewed by wiz@
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for use on OpenBSD, there is a separate release for that.
Reviewed by wiz@
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Changes since OpenSSH 7.0
=========================
This is a bugfix release.
Security
--------
* sshd(8): OpenSSH 7.0 contained a logic error in PermitRootLogin=
prohibit-password/without-password that could, depending on
compile-time configuration, permit password authentication to
root while preventing other forms of authentication. This problem
was reported by Mantas Mikulenas.
Bugfixes
--------
* ssh(1), sshd(8): add compatability workarounds for FuTTY
* ssh(1), sshd(8): refine compatability workarounds for WinSCP
* Fix a number of memory faults (double-free, free of uninitialised
memory, etc) in ssh(1) and ssh-keygen(1). Reported by Mateusz
Kocielski.
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privilege separation has been disabled all that time. The logic was changed
such that it was only enabled on Interix, instead of only being disabled on
Interix as originally intended.
While here, pull in patches from MacPorts to enable privsep on Darwin.
Bump PKGREVISION.
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Bump PKGREVISION.
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pkgsrc change:
* tcp_wrappers support was removed from release 6.7, but add it refering
FreeBSD's ports.
* hpn-patch is also based on FreeBSD's ports.
Security
--------
* ssh(1): when forwarding X11 connections with ForwardX11Trusted=no,
connections made after ForwardX11Timeout expired could be permitted
and no longer subject to XSECURITY restrictions because of an
ineffective timeout check in ssh(1) coupled with "fail open"
behaviour in the X11 server when clients attempted connections with
expired credentials. This problem was reported by Jann Horn.
* ssh-agent(1): fix weakness of agent locking (ssh-add -x) to
password guessing by implementing an increasing failure delay,
storing a salted hash of the password rather than the password
itself and using a timing-safe comparison function for verifying
unlock attempts. This problem was reported by Ryan Castellucci.
For more information, please refer release announce.
http://www.openssh.com/txt/release-6.9
http://www.openssh.com/txt/release-6.8
http://www.openssh.com/txt/release-6.7
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Fixes "dyld: Symbol not found: _allow_severity".
From Andreas Kusalananda Kähäri on pkgsrc-users.
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having a PKGNAME of p5-*, or depending such a package,
for perl-5.22.0.
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http://www.openwall.com/lists/oss-security/2015/05/16/3
Reviewed by wiz@
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proposed/discussed is required for such changes.
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It's not available.
ftp://ftp.belnet.be/pub/OpenBSD/OpenSSH/portable/ (capitalize openbsd) is
availabe, but it's a mirror, not the special old distfile holder.
Moreover, mirrors have good enough old versions, and "old" subdirectory
have much old distfiles.
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From Matthias Ferdinand on pkgsrc-users.
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513.
Bump PKGREVISION.
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Do it for all packages that
* mention perl, or
* have a directory name starting with p5-*, or
* depend on a package starting with p5-
like last time, for 5.18, where this didn't lead to complaints.
Let me know if you have any this time.
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It was noted by Ken'ichi Fukamachi via PR pkg/48825.
Bump PKGREVISION.
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pkgsrc change
* Use PLIST_VARS.
* Update hpn-patch based on openssh-6.5p1-hpnssh14v4.diff.gz.
Fixes security problem (SA57488).
For full changes, please refer below release notes.
http://www.openssh.com/txt/release-6.5
http://www.openssh.com/txt/release-6.6
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not use libtool to do so. This is required to correctly depend upon a
gcc runtime package (e.g. gcc47-libs) when using USE_PKGSRC_GCC_RUNTIME.
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These are now handled dynamically if INIT_SYSTEM is set to "rc.d", or
ignored otherwise.
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Changes since OpenSSH 6.3
=========================
This release fixes a security bug:
* sshd(8): fix a memory corruption problem triggered during rekeying
when an AES-GCM cipher is selected. Full details of the vulnerability
are available at: http://www.openssh.com/txt/gcmrekey.adv
Changes since OpenSSH 6.2 is too many to write here, please refer
the release note: http://www.openssh.com/txt/release-6.3.
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sysutils/user_* packages.
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a) refer 'perl' in their Makefile, or
b) have a directory name of p5-*, or
c) have any dependency on any p5-* package
Like last time, where this caused no complaints.
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=========================
This release introduces a number of new features:
Features:
* ssh(1)/sshd(8): Added support for AES-GCM authenticated encryption in
SSH protocol 2. The new cipher is available as aes128-gcm@openssh.com
and aes256-gcm@openssh.com. It uses an identical packet format to the
AES-GCM mode specified in RFC 5647, but uses simpler and different
selection rules during key exchange.
* ssh(1)/sshd(8): Added support for encrypt-then-mac (EtM) MAC modes
for SSH protocol 2. These modes alter the packet format and compute
the MAC over the packet length and encrypted packet rather than over
the plaintext data. These modes are considered more secure and are
used by default when available.
* ssh(1)/sshd(8): Added support for the UMAC-128 MAC as
"umac-128@openssh.com" and "umac-128-etm@openssh.com". The latter
being an encrypt-then-mac mode.
* sshd(8): Added support for multiple required authentication in SSH
protocol 2 via an AuthenticationMethods option. This option lists
one or more comma-separated lists of authentication method names.
Successful completion of all the methods in any list is required for
authentication to complete. This allows, for example, requiring a
user having to authenticate via public key or GSSAPI before they
are offered password authentication.
* sshd(8)/ssh-keygen(1): Added support for Key Revocation Lists
(KRLs), a compact binary format to represent lists of revoked keys
and certificates that take as little as one bit per certificate when
revoking by serial number. KRLs may be generated using ssh-keygen(1)
and are loaded into sshd(8) via the existing RevokedKeys sshd_config
option.
* ssh(1): IdentitiesOnly now applies to keys obtained from a
PKCS11Provider. This allows control of which keys are offered from
tokens using IdentityFile.
* sshd(8): sshd_config(5)'s AllowTcpForwarding now accepts "local"
and "remote" in addition to its previous "yes"/"no" keywords to allow
the server to specify whether just local or remote TCP forwarding is
enabled.
* sshd(8): Added a sshd_config(5) option AuthorizedKeysCommand to
support fetching authorized_keys from a command in addition to (or
instead of) from the filesystem. The command is run under an account
specified by an AuthorizedKeysCommandUser sshd_config(5) option.
* sftp-server(8): Now supports a -d option to allow the starting
directory to be something other than the user's home directory.
* ssh-keygen(1): Now allows fingerprinting of keys hosted in PKCS#11
tokens using "ssh-keygen -lD pkcs11_provider".
* ssh(1): When SSH protocol 2 only is selected (the default), ssh(1)
now immediately sends its SSH protocol banner to the server without
waiting to receive the server's banner, saving time when connecting.
* ssh(1): Added ~v and ~V escape sequences to raise and lower the
logging level respectively.
* ssh(1): Made the escape command help (~?) context sensitive so that
only commands that will work in the current session are shown.
* ssh-keygen(1): When deleting host lines from known_hosts using
"ssh-keygen -R host", ssh-keygen(1) now prints details of which lines
were removed.
Bugfixes:
* ssh(1): Force a clean shutdown of ControlMaster client sessions when
the ~. escape sequence is used. This means that ~. should now work in
mux clients even if the server is no longer responding.
* ssh(1): Correctly detect errors during local TCP forward setup in
multiplexed clients. bz#2055
* ssh-add(1): Made deleting explicit keys "ssh-add -d" symmetric with
adding keys with respect to certificates. It now tries to delete the
corresponding certificate and respects the -k option to allow deleting
of the key only.
* sftp(1): Fix a number of parsing and command-editing bugs, including
bz#1956
* ssh(1): When muxmaster is run with -N, ensured that it shuts down
gracefully when a client sends it "-O stop" rather than hanging around.
bz#1985
* ssh-keygen(1): When screening moduli candidates, append to the file
rather than overwriting to allow resumption. bz#1957
* ssh(1): Record "Received disconnect" messages at ERROR rather than
INFO priority. bz#2057.
* ssh(1): Loudly warn if explicitly-provided private key is unreadable.
bz#1981
Portable OpenSSH:
* sshd(8): The Linux seccomp-filter sandbox is now supported on ARM
platforms where the kernel supports it.
* sshd(8): The seccomp-filter sandbox will not be enabled if the system
headers support it at compile time, regardless of whether it can be
enabled then. If the run-time system does not support seccomp-filter,
sshd will fall back to the rlimit pseudo-sandbox.
* ssh(1): Don't link in the Kerberos libraries. They aren't necessary
on the client, just on sshd(8). bz#2072
* Fix GSSAPI linking on Solaris, which uses a differently-named GSSAPI
library. bz#2073
* Fix compilation on systems with openssl-1.0.0-fips.
* Fix a number of errors in the RPM spec files.
Changes since OpenSSH 6.0
=========================
This is primarily a bugfix release.
Features:
* sshd(8): This release turns on pre-auth sandboxing sshd by default for
new installs, by setting UsePrivilegeSeparation=sandbox in sshd_config.
* ssh-keygen(1): Add options to specify starting line number and number of
lines to process when screening moduli candidates, allowing processing
of different parts of a candidate moduli file in parallel
* sshd(8): The Match directive now supports matching on the local (listen)
address and port upon which the incoming connection was received via
LocalAddress and LocalPort clauses.
* sshd(8): Extend sshd_config Match directive to allow setting AcceptEnv
and {Allow,Deny}{Users,Groups}
* Add support for RFC6594 SSHFP DNS records for ECDSA key types. bz#1978
* ssh-keygen(1): Allow conversion of RSA1 keys to public PEM and PKCS8
* sshd(8): Allow the sshd_config PermitOpen directive to accept "none" as
an argument to refuse all port-forwarding requests.
* sshd(8): Support "none" as an argument for AuthorizedPrincipalsFile
* ssh-keyscan(1): Look for ECDSA keys by default. bz#1971
* sshd(8): Add "VersionAddendum" to sshd_config to allow server operators
to append some arbitrary text to the server SSH protocol banner.
Bugfixes:
* ssh(1)/sshd(8): Don't spin in accept() in situations of file
descriptor exhaustion. Instead back off for a while.
* ssh(1)/sshd(8): Remove hmac-sha2-256-96 and hmac-sha2-512-96 MACs as
they were removed from the specification. bz#2023,
* sshd(8): Handle long comments in config files better. bz#2025
* ssh(1): Delay setting tty_flag so RequestTTY options are correctly
picked up. bz#1995
* sshd(8): Fix handling of /etc/nologin incorrectly being applied to root
on platforms that use login_cap.
Portable OpenSSH:
* sshd(8): Allow sshd pre-auth sandboxing to fall-back to the rlimit
sandbox from the Linux SECCOMP filter sandbox when the latter is
not available in the kernel.
* ssh(1): Fix NULL dereference when built with LDNS and using DNSSEC to
retrieve a CNAME SSHFP record.
* Fix cross-compilation problems related to pkg-config. bz#1996
Changes since OpenSSH 5.9
=========================
This is primarily a bugfix release.
Features:
* ssh-keygen(1): Add optional checkpoints for moduli screening
* ssh-add(1): new -k option to load plain keys (skipping certificates)
* sshd(8): Add wildcard support to PermitOpen, allowing things like
"PermitOpen localhost:*". bz #1857
* ssh(1): support for cancelling local and remote port forwards via the
multiplex socket. Use ssh -O cancel -L xx:xx:xx -R yy:yy:yy user@host"
to request the cancellation of the specified forwardings
* support cancellation of local/dynamic forwardings from ~C commandline
Bugfixes:
* ssh(1): ensure that $DISPLAY contains only valid characters before
using it to extract xauth data so that it can't be used to play local
shell metacharacter games.
* ssh(1): unbreak remote portforwarding with dynamic allocated listen ports
* scp(1): uppress adding '--' to remote commandlines when the first
argument does not start with '-'. saves breakage on some
difficult-to-upgrade embedded/router platforms
* ssh(1)/sshd(8): fix typo in IPQoS parsing: there is no "AF14" class,
but there is an "AF21" class
* ssh(1)/sshd(8): do not permit SSH2_MSG_SERVICE_REQUEST/ACCEPT during
rekeying
* ssh(1): skip attempting to create ~/.ssh when -F is passed
* sshd(8): unbreak stdio forwarding when ControlPersist is in use; bz#1943
* sshd(1): send tty break to pty master instead of (probably already
closed) slave side; bz#1859
* sftp(1): silence error spam for "ls */foo" in directory with files;
bz#1683
* Fixed a number of memory and file descriptor leaks
Portable OpenSSH:
* Add a new privilege separation sandbox implementation for Linux's
new seccomp sandbox, automatically enabled on platforms that support
it. (Note: privilege separation sandboxing is still experimental)
* Fix compilation problems on FreeBSD, where libutil contained openpty()
but not login().
* ssh-keygen(1): don't fail in -A on platforms that don't support ECC
* Add optional support for LDNS, a BSD licensed DNS resolver library
which supports DNSSEC
* Relax OpenSSL version check to allow running OpenSSH binaries on
systems with OpenSSL libraries with a newer "fix" or "patch" level
than the binaries were originally compiled on (previous check only
allowed movement within "patch" releases). bz#1991
* Fix builds using contributed Redhat spec file. bz#1992
Changes since OpenSSH 5.8
=========================
Features:
* Introduce sandboxing of the pre-auth privsep child using an optional
sshd_config(5) "UsePrivilegeSeparation=sandbox" mode that enables
mandatory restrictions on the syscalls the privsep child can perform.
This intention is to prevent a compromised privsep child from being
used to attack other hosts (by opening sockets and proxying) or
probing local kernel attack surface.
Three concrete sandbox implementation are provided (selected at
configure time): systrace, seatbelt and rlimit.
The systrace sandbox uses systrace(4) in unsupervised "fast-path"
mode, where a list of permitted syscalls is supplied. Any syscall not
on the list results in SIGKILL being sent to the privsep child. Note
that this requires a kernel with the new SYSTR_POLICY_KILL option
(only OpenBSD has this mode at present).
The seatbelt sandbox uses OS X/Darwin sandbox(7) facilities with a
strict (kSBXProfilePureComputation) policy that disables access to
filesystem and network resources.
The rlimit sandbox is a fallback choice for platforms that don't
support a better one; it uses setrlimit() to reset the hard-limit
of file descriptors and processes to zero, which should prevent
the privsep child from forking or opening new network connections.
Sandboxing of the privilege separated child process is currently
experimental but should become the default in a future release.
Native sandboxes for other platforms are welcome (e.g. Capsicum,
Linux pid/net namespaces, etc.)
* Add new SHA256-based HMAC transport integrity modes from
http://www.ietf.org/id/draft-dbider-sha2-mac-for-ssh-02.txt
These modes are hmac-sha2-256, hmac-sha2-256-96, hmac-sha2-512,
and hmac-sha2-512-96, and are available by default in ssh(1) and
sshd(8)
* The pre-authentication sshd(8) privilege separation slave process
now logs via a socket shared with the master process, avoiding the
need to maintain /dev/log inside the chroot.
* ssh(1) now warns when a server refuses X11 forwarding
* sshd_config(5)'s AuthorizedKeysFile now accepts multiple paths,
separated by whitespace. The undocumented AuthorizedKeysFile2
option is deprecated (though the default for AuthorizedKeysFile
includes .ssh/authorized_keys2)
* sshd_config(5): similarly deprecate UserKnownHostsFile2 and
GlobalKnownHostsFile2 by making UserKnownHostsFile and
GlobalKnownHostsFile accept multiple options and default to
include known_hosts2
* Retain key comments when loading v.2 keys. These will be visible
in "ssh-add -l" and other places. bz#439
* ssh(1) and sshd(8): set IPv6 traffic class from IPQoS (as well as
IPv4 ToS/DSCP). bz#1855
* ssh_config(5)'s ControlPath option now expands %L to the host
portion of the destination host name.
* ssh_config(5) "Host" options now support negated Host matching, e.g.
Host *.example.org !c.example.org
User mekmitasdigoat
Will match "a.example.org", "b.example.org", but not "c.example.org"
* ssh_config(5): a new RequestTTY option provides control over when a
TTY is requested for a connection, similar to the existing -t/-tt/-T
ssh(1) commandline options.
* sshd(8): allow GSSAPI authentication to detect when a server-side
failure causes authentication failure and don't count such failures
against MaxAuthTries; bz#1244
* ssh-keygen(1): Add -A option. For each of the key types (rsa1, rsa,
dsa and ecdsa) for which host keys do not exist, generate the host
keys with the default key file path, an empty passphrase, default
bits for the key type, and default comment. This is useful for
system initialisation scripts.
* ssh(1): Allow graceful shutdown of multiplexing: request that a mux
server removes its listener socket and refuse future multiplexing
requests but don't kill existing connections. This may be requested
using "ssh -O stop ..."
* ssh-add(1) now accepts keys piped from standard input. E.g.
"ssh-add - < /path/to/key"
* ssh-keysign(8) now signs hostbased authentication
challenges correctly using ECDSA keys; bz#1858
* sftp(1): document that sftp accepts square brackets to delimit
addresses (useful for IPv6); bz#1847a
* ssh(1): when using session multiplexing, the master process will
change its process title to reflect the control path in use and
when a ControlPersist-ed master is waiting to close; bz#1883 and
bz#1911
* Other minor bugs fixed: 1849 1861 1862 1869 1875 1878 1879 1892
1900 1905 1913
Portable OpenSSH Bugfixes:
* Fix a compilation error in the SELinux support code. bz#1851
* This release removes support for ssh-rand-helper. OpenSSH now
obtains its random numbers directly from OpenSSL or from
a PRNGd/EGD instance specified at configure time.
* sshd(8) now resets the SELinux process execution context before
executing passwd for password changes; bz#1891
* Since gcc >= 4.x ignores all -Wno-options options, test only the
corresponding -W-option when trying to determine whether it is
accepted; bz#1901
* Add ECDSA key generation to the Cygwin ssh-{host,user}-config
scripts.
* Updated .spec and init files for Linux; bz#1920
* Improved SELinux error messages in context change failures and
suppress error messages when attempting to change from the
"unconfined_t" type; bz#1924 bz#1919
* Fix build errors on platforms without dlopen(); bz#1929
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