4 You will need working installations of Zlib and OpenSSL.
7 http://www.cdrom.com/pub/infozip/zlib/
10 http://www.openssl.org/
12 RPMs of OpenSSL are available in the support/ directory of the OpenSSH
13 mirror site. OpenSSH requires OpenSSL version 0.9.5 or later.
15 OpenSSH can utilise Pluggable Authentication Modules (PAM) if your system
16 supports it. PAM is standard on Redhat and Debian Linux and on Solaris.
19 http://www.kernel.org/pub/linux/libs/pam/
21 If you wish to build the GNOME passphrase requester, you will need the GNOME
22 libraries and headers.
27 Alternatively, Jim Knoble <jmknoble@pobox.com> has written an excellent X11
28 passphrase requester. This is maintained separately at:
30 http://www.ntrnet.net/~jmknoble/software/x11-ssh-askpass/index.html
32 If you are planning to use OpenSSH on a Unix which lacks a Kernel random
33 number generator (/dev/urandom), you will need to install the Entropy
34 Gathering Daemon (or similar). You will also need to specify the
35 --with-egd-pool option to ./configure.
38 http://www.lothar.com/tech/crypto/
41 ftp://ftp.gnu.org/gnu/make/
43 OpenSSH has only been tested with GNU make. It may work with other
44 'make' programs, but you are on your own.
46 2. Building / Installation
47 --------------------------
49 To install OpenSSH with default options:
55 This will install the OpenSSH binaries in /usr/local/bin, configuration files
56 in /usr/local/etc, the server in /usr/local/sbin, etc. To specify a different
57 installation prefix, use the --prefix option to configure:
59 ./configure --prefix=/opt
63 Will install OpenSSH in /opt/{bin,etc,lib,sbin}. You can also override
64 specific paths, for example:
66 ./configure --prefix=/opt --sysconfdir=/etc/ssh
70 This will install the binaries in /opt/{bin,lib,sbin}, but will place the
71 configuration files in /etc/ssh.
73 If you are using PAM, you will need to manually install a PAM
74 control file as "/etc/pam.d/sshd" (or wherever your system
75 prefers to keep them). A generic PAM configuration is included as
76 "contrib/sshd.pam.generic", you may need to edit it before using it on
77 your system. If you are using a recent version of Redhat Linux, the
78 config file in contrib/redhat/sshd.pam should be more useful.
80 There are a few other options to the configure script:
82 --with-rsh=PATH allows you to specify the path to your rsh program.
83 Normally ./configure will search the current $PATH for 'rsh'. You
84 may need to specify this option if rsh is not in your path or has a
87 --without-pam will disable PAM support. PAM is automatically detected
88 and switched on if found.
90 --enable-gnome-askpass will build the GNOME passphrase dialog. You
91 need a working installation of GNOME, including the development
92 headers, for this to work.
94 --with-random=/some/file allows you to specify an alternate source of
95 random numbers (the default is /dev/urandom). Unless you are absolutly
96 sure of what you are doing, it is best to leave this alone.
98 --with-egd-pool=/some/file allows you to enable Entropy Gathering
99 Daemon support and to specify a EGD pool socket. You will need to
100 use this if your Unix does not support the /dev/urandom device (or
101 similar). The file argument refers to the EGD pool file, not the
102 EGD program itself. Please refer to the EGD documentation.
104 --with-lastlog=FILE will specify the location of the lastlog file.
105 ./configure searches a few locations for lastlog, but may not find
106 it if lastlog is installed in a different place.
108 --without-lastlog will disable lastlog support entirely.
110 --with-kerberos4=PATH will enable Kerberos IV support. You will need
111 to have the Kerberos libraries and header files installed for this
112 to work. Use the optional PATH argument to specify the root of your
113 Kerberos installation.
115 --with-afs=PATH will enable AFS support. You will need to have the
116 Kerberos IV and the AFS libraries and header files installed for this
117 to work. Use the optional PATH argument to specify the root of your
118 AFS installation. AFS requires Kerberos support to be enabled.
120 --with-skey will enable S/Key one time password support. You will need
121 the S/Key libraries and header files installed for this to work.
123 --with-tcp-wrappers will enable TCP Wrappers (/etc/hosts.allow|deny)
124 support. You will need libwrap.a and tcpd.h installed.
126 --with-md5-passwords will enable the use of MD5 passwords. Enable this
127 if your operating system uses MD5 passwords without using PAM.
129 --with-utmpx enables utmpx support. utmpx support is automatic for
132 --without-shadow disables shadow password support.
134 --with-ipaddr-display forces the use of a numeric IP address in the
135 $DISPLAY environment variable. Some broken systems need this.
137 --with-default-path=PATH allows you to specify a default $PATH for sessions
138 started by sshd. This replaces the standard path entirely.
140 --with-pid-dir=PATH specifies the directory in which the ssh.pid file is
143 --with-xauth=PATH specifies the location of the xauth binary
145 --with-ipv4-default instructs OpenSSH to use IPv4 by default for new
146 connections. Normally OpenSSH will try attempt to lookup both IPv6 and
147 IPv4 addresses. On Linux/glibc-2.1.2 this causes long delays in name
148 resolution. If this option is specified, you can still attempt to
149 connect to IPv6 addresses using the command line option '-6'.
151 --with-ssl-dir=DIR allows you to specify where your OpenSSL libraries
154 --with-4in6 Check for IPv4 in IPv6 mapped addresses and convert them to
155 real (AF_INET) IPv4 addresses. Works around some quirks on Linux.
157 If you need to pass special options to the compiler or linker, you
158 can specify these as enviornment variables before running ./configure.
161 CFLAGS="-O -m486" LFLAGS="-s" LIBS="-lrubbish" LD="/usr/foo/ld" ./configure
166 The runtime configuration files are installed by in ${prefix}/etc or
167 whatever you specified as your --sysconfdir (/usr/local/etc by default).
169 The default configuration should be instantly usable, though you should
170 review it to ensure that it matches your security requirements.
172 To generate a host key, run "make host-key". Alternately you can do so
173 manually using the following command:
175 /usr/bin/ssh-keygen -b 1024 -f /etc/ssh/ssh_host_key -N ''
177 Replacing /etc/ssh with the correct path to the configuration directory.
178 (${prefix}/etc or whatever you specified with --sysconfdir during
181 If you have configured OpenSSH with EGD support, ensure that EGD is
182 running and has collected some Entropy.
184 For more information on configuration, please refer to the manual pages
185 for sshd, ssh and ssh-agent.
190 If you experience problems compiling, installing or running OpenSSH.
191 Please refer to the "reporting bugs" section of the webpage at
192 http://violet.ibs.com.au/openssh/