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1. Prerequisites
----------------

A C compiler.  Any C89 or better compiler should work.  Where supported,
configure will attempt to enable the compiler's run-time integrity checking
options.  Some notes about specific compilers:
 - clang: -ftrapv and -sanitize=integer require the compiler-rt runtime
  (CC=clang LDFLAGS=--rtlib=compiler-rt ./configure)

You will need working installations of Zlib and libcrypto (LibreSSL /
OpenSSL)

Zlib 1.1.4 or 1.2.1.2 or greater (earlier 1.2.x versions have problems):
http://www.gzip.org/zlib/

libcrypto from either of:
 - LibreSSL (http://www.libressl.org/)
 - OpenSSL 1.0.x >= 1.0.1 or 1.1.0 >= 1.1.0g (http://www.openssl.org/)

LibreSSL/OpenSSL should be compiled as a position-independent library
(i.e. with -fPIC) otherwise OpenSSH will not be able to link with it.
If you must use a non-position-independent libcrypto, then you may need
to configure OpenSSH --without-pie.  Note that due to a bug in EVP_CipherInit
OpenSSL 1.1 versions prior to 1.1.0g can't be used.

The remaining items are optional.

NB. If you operating system supports /dev/random, you should configure
libcrypto (LibreSSL/OpenSSL) to use it. OpenSSH relies on libcrypto's
direct support of /dev/random, or failing that, either prngd or egd

PRNGD:

If your system lacks kernel-based random collection, the use of Lutz
Jaenicke's PRNGd is recommended.

http://prngd.sourceforge.net/

EGD:

If the kernel lacks /dev/random the Entropy Gathering Daemon (EGD) is
supported only if libcrypto supports it.

http://egd.sourceforge.net/

PAM:

OpenSSH can utilise Pluggable Authentication Modules (PAM) if your
system supports it. PAM is standard most Linux distributions, Solaris,
HP-UX 11, AIX >= 5.2, FreeBSD and NetBSD.

Information about the various PAM implementations are available:

Solaris PAM:	http://www.sun.com/software/solaris/pam/
Linux PAM:	http://www.kernel.org/pub/linux/libs/pam/
OpenPAM:	http://www.openpam.org/

If you wish to build the GNOME passphrase requester, you will need the GNOME
libraries and headers.

GNOME:
http://www.gnome.org/

Alternatively, Jim Knoble <jmknoble@pobox.com> has written an excellent X11
passphrase requester. This is maintained separately at:

http://www.jmknoble.net/software/x11-ssh-askpass/

LibEdit:

sftp supports command-line editing via NetBSD's libedit.  If your platform
has it available natively you can use that, alternatively you might try
these multi-platform ports:

http://www.thrysoee.dk/editline/
http://sourceforge.net/projects/libedit/

LDNS:

LDNS is a DNS BSD-licensed resolver library which supports DNSSEC.

http://nlnetlabs.nl/projects/ldns/

Autoconf:

If you modify configure.ac or configure doesn't exist (eg if you checked
the code out of git yourself) then you will need autoconf-2.69 to rebuild
the automatically generated files by running "autoreconf".  Earlier
versions may also work but this is not guaranteed.

http://www.gnu.org/software/autoconf/

Basic Security Module (BSM):

Native BSM support is known to exist in Solaris from at least 2.5.1,
FreeBSD 6.1 and OS X.  Alternatively, you may use the OpenBSM
implementation (http://www.openbsm.org).

makedepend:

https://www.x.org/archive/individual/util/

If you are making significant changes to the code you may need to rebuild
the dependency (.depend) file using "make depend", which requires the
"makedepend" tool from the X11 distribution.

2. Building / Installation
--------------------------

To install OpenSSH with default options:

./configure
make
make install

This will install the OpenSSH binaries in /usr/local/bin, configuration files
in /usr/local/etc, the server in /usr/local/sbin, etc. To specify a different
installation prefix, use the --prefix option to configure:

./configure --prefix=/opt
make
make install

Will install OpenSSH in /opt/{bin,etc,lib,sbin}. You can also override
specific paths, for example:

./configure --prefix=/opt --sysconfdir=/etc/ssh
make
make install

This will install the binaries in /opt/{bin,lib,sbin}, but will place the
configuration files in /etc/ssh.

If you are using Privilege Separation (which is enabled by default)
then you will also need to create the user, group and directory used by
sshd for privilege separation.  See README.privsep for details.

If you are using PAM, you may need to manually install a PAM control
file as "/etc/pam.d/sshd" (or wherever your system prefers to keep
them).  Note that the service name used to start PAM is __progname,
which is the basename of the path of your sshd (e.g., the service name
for /usr/sbin/osshd will be osshd).  If you have renamed your sshd
executable, your PAM configuration may need to be modified.

A generic PAM configuration is included as "contrib/sshd.pam.generic",
you may need to edit it before using it on your system. If you are
using a recent version of Red Hat Linux, the config file in
contrib/redhat/sshd.pam should be more useful.  Failure to install a
valid PAM file may result in an inability to use password
authentication.  On HP-UX 11 and Solaris, the standard /etc/pam.conf
configuration will work with sshd (sshd will match the other service
name).

There are a few other options to the configure script:

--with-audit=[module] enable additional auditing via the specified module.
Currently, drivers for "debug" (additional info via syslog) and "bsm"
(Sun's Basic Security Module) are supported.

--with-pam enables PAM support. If PAM support is compiled in, it must
also be enabled in sshd_config (refer to the UsePAM directive).

--with-prngd-socket=/some/file allows you to enable EGD or PRNGD
support and to specify a PRNGd socket. Use this if your Unix lacks
/dev/random.

--with-prngd-port=portnum allows you to enable EGD or PRNGD support
and to specify a EGD localhost TCP port. Use this if your Unix lacks
/dev/random.

--with-lastlog=FILE will specify the location of the lastlog file.
./configure searches a few locations for lastlog, but may not find
it if lastlog is installed in a different place.

--without-lastlog will disable lastlog support entirely.

--with-osfsia, --without-osfsia will enable or disable OSF1's Security
Integration Architecture.  The default for OSF1 machines is enable.

--with-md5-passwords will enable the use of MD5 passwords. Enable this
if your operating system uses MD5 passwords and the system crypt() does
not support them directly (see the crypt(3/3c) man page). If enabled, the
resulting binary will support both MD5 and traditional crypt passwords.

--with-utmpx enables utmpx support. utmpx support is automatic for
some platforms.

--without-shadow disables shadow password support.

--with-ipaddr-display forces the use of a numeric IP address in the
$DISPLAY environment variable. Some broken systems need this.

--with-default-path=PATH allows you to specify a default $PATH for sessions
started by sshd. This replaces the standard path entirely.

--with-pid-dir=PATH specifies the directory in which the sshd.pid file is
created.

--with-xauth=PATH specifies the location of the xauth binary

--with-ssl-dir=DIR allows you to specify where your Libre/OpenSSL
libraries are installed.

--with-ssl-engine enables Libre/OpenSSL's (hardware) ENGINE support

--with-4in6 Check for IPv4 in IPv6 mapped addresses and convert them to
real (AF_INET) IPv4 addresses. Works around some quirks on Linux.

If you need to pass special options to the compiler or linker, you
can specify these as environment variables before running ./configure.
For example:

CC="/usr/foo/cc" CFLAGS="-O" LDFLAGS="-s" LIBS="-lrubbish" ./configure

3. Configuration
----------------

The runtime configuration files are installed by in ${prefix}/etc or
whatever you specified as your --sysconfdir (/usr/local/etc by default).

The default configuration should be instantly usable, though you should
review it to ensure that it matches your security requirements.

To generate a host key, run "make host-key". Alternately you can do so
manually using the following commands:

    ssh-keygen -t [type] -f /etc/ssh/ssh_host_key -N ""

for each of the types you wish to generate (rsa, dsa or ecdsa) or

    ssh-keygen -A

to generate keys for all supported types.

Replacing /etc/ssh with the correct path to the configuration directory.
(${prefix}/etc or whatever you specified with --sysconfdir during
configuration)

If you have configured OpenSSH with EGD support, ensure that EGD is
running and has collected some Entropy.

For more information on configuration, please refer to the manual pages
for sshd, ssh and ssh-agent.

4. (Optional) Send survey
-------------------------

$ make survey
[check the contents of the file "survey" to ensure there's no information
that you consider sensitive]
$ make send-survey

This will send configuration information for the currently configured
host to a survey address.  This will help determine which configurations
are actually in use, and what valid combinations of configure options
exist.  The raw data is available only to the OpenSSH developers, however
summary data may be published.

5. Problems?
------------

If you experience problems compiling, installing or running OpenSSH.
Please refer to the "reporting bugs" section of the webpage at
https://www.openssh.com/
NineSec Team - 2022