Релиз OpenSSH

Зарелизился OpenSSH версии 5.7.
Изменения по сравнению с OpenSSH 5.6


* Implement Elliptic Curve Cryptography modes for key exchange (ECDH)
and host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA
offer better performance than plain DH and DSA at the same equivalent
symmetric key length, as well as much shorter keys.

Only the mandatory sections of RFC5656 are implemented, specifically
the three REQUIRED curves nistp256, nistp384 and nistp521 and only
ECDH and ECDSA. Point compression (optional in RFC5656) is NOT

Certificate host and user keys using the new ECDSA key types are
supported - an ECDSA key may be certified, and an ECDSA key may act
as a CA to sign certificates.

ECDH in a 256 bit curve field is the preferred key agreement
algorithm when both the client and server support it. ECDSA host
keys are preferred when learning a host's keys for the first time,
or can be learned using ssh-keyscan(1).

* sftp(1)/sftp-server(8): add a protocol extension to support a hard
link operation. It is available through the "ln" command in the
client. The old "ln" behaviour of creating a symlink is available
using its "-s" option or through the preexisting "symlink" command

* scp(1): Add a new -3 option to scp: Copies between two remote hosts
are transferred through the local host. Without this option the
data is copied directly between the two remote hosts.

* ssh(1): automatically order the hostkeys requested by the client
based on which hostkeys are already recorded in known_hosts. This
avoids hostkey warnings when connecting to servers with new ECDSA
keys, since these are now preferred when learning hostkeys for the
first time.

* ssh(1)/sshd(8): add a new IPQoS option to specify arbitrary
TOS/DSCP/QoS values instead of hardcoding lowdelay/throughput.

* sftp(1): the sftp client is now significantly faster at performing
directory listings, using OpenBSD glob(3) extensions to preserve
the results of stat(3) operations performed in the course of its
execution rather than performing expensive round trips to fetch
them again afterwards.

* ssh(1): "atomically" create the listening mux socket by binding it on
a temporary name and then linking it into position after listen() has
succeeded. This allows the mux clients to determine that the server
socket is either ready or stale without races. stale server sockets
are now automatically removed. (also fixes bz#1711)

* ssh(1)/sshd(8): add a KexAlgorithms knob to the client and server
configuration to allow selection of which key exchange methods are
used by ssh(1) and sshd( and their order of preference.

* sftp(1)/scp(1): factor out bandwidth limiting code from scp(1) into
a generic bandwidth limiter that can be attached using the atomicio
callback mechanism and use it to add a bandwidth limit option to
sftp(1). bz#1147


* ssh(1)/ssh-agent(1): honour $TMPDIR for client xauth and ssh-agent
temporary directories. bz#1809

* ssh(1): avoid NULL deref on receiving a channel request on an unknown
or invalid channel; bz#1842

* sshd(8): remove a debug() that pollutes stderr on client connecting
to a server in debug mode; bz#1719

* scp(1): pass through ssh command-line flags and options when doing
remote-remote transfers, e.g. to enable agent forwarding which is
particularly useful in this case; bz#1837

* sftp-server(8): umask should be parsed as octal

* sftp(1): escape '[' in filename tab-completion

* ssh(1): Typo in confirmation message. bz#1827

* sshd(8): prevent free() of string in .rodata when overriding
AuthorizedKeys in a Match block

* sshd(8): Use default shell /bin/sh if $SHELL is ""

* ssh(1): kill proxy command on fatal() (we already killed it on
clean exit);

* ssh(1): install a SIGCHLD handler to reap expiried child process;

* Support building against openssl-1.0.0a

Portable OpenSSH Bugfixes:

* Use mandoc as preferred manpage formatter if it is present, followed
by nroff and groff respectively.

* sshd(8): Relax permission requirement on btmp logs to allow group

* bz#1840: fix warning when configuring --with-ssl-engine

* sshd(8): Use correct uid_t/pid_t types instead of int. bz#1817

* sshd(8): bz#1824: Add Solaris Project support.

* sshd(8): Check is_selinux_enabled for exact return code since it can
apparently return -1 under some conditions.

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