4 You will need working installations of Zlib and OpenSSL.
7 http://www.freesoftware.com/pub/infozip/zlib/
9 OpenSSL 0.9.5a or greater:
10 http://www.openssl.org/
12 RPMs of OpenSSL are available at http://violet.ibs.com.au/openssh/files/support
14 OpenSSH can utilise Pluggable Authentication Modules (PAM) if your system
15 supports it. PAM is standard on Redhat and Debian Linux, Solaris and
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 The Entropy Gathering Daemon (EGD) is supported if you have a system which
33 lacks /dev/random and don't want to use OpenSSH's internal entropy collection.
36 http://www.lothar.com/tech/crypto/
39 ftp://ftp.gnu.org/gnu/make/
41 OpenSSH has only been tested with GNU make. It may work with other
42 'make' programs, but you are on your own.
44 pcre (POSIX Regular Expression library):
45 ftp://ftp.cus.cam.ac.uk/pub/software/programs/pcre/
47 Most platforms do not required this. However older 4.3 BSD do not
48 have a posix regex library.
51 http://www.sparc.spb.su/solaris/skey/
53 If you wish to use --with-skey then you will need the above library
54 installed. No other current S/Key library is currently known to be
57 2. Building / Installation
58 --------------------------
60 To install OpenSSH with default options:
66 This will install the OpenSSH binaries in /usr/local/bin, configuration files
67 in /usr/local/etc, the server in /usr/local/sbin, etc. To specify a different
68 installation prefix, use the --prefix option to configure:
70 ./configure --prefix=/opt
74 Will install OpenSSH in /opt/{bin,etc,lib,sbin}. You can also override
75 specific paths, for example:
77 ./configure --prefix=/opt --sysconfdir=/etc/ssh
81 This will install the binaries in /opt/{bin,lib,sbin}, but will place the
82 configuration files in /etc/ssh.
84 If you are using PAM, you may need to manually install a PAM
85 control file as "/etc/pam.d/sshd" (or wherever your system
86 prefers to keep them). A generic PAM configuration is included as
87 "contrib/sshd.pam.generic", you may need to edit it before using it on
88 your system. If you are using a recent version of Redhat Linux, the
89 config file in contrib/redhat/sshd.pam should be more useful.
90 Failure to install a valid PAM file may result in an inability to
91 use password authentication. On HP-UX 11, the standard /etc/pam.conf
92 configuration will work with sshd (sshd will match the OTHER service
95 There are a few other options to the configure script:
97 --with-rsh=PATH allows you to specify the path to your rsh program.
98 Normally ./configure will search the current $PATH for 'rsh'. You
99 may need to specify this option if rsh is not in your path or has a
102 --without-pam will disable PAM support. PAM is automatically detected
103 and switched on if found.
105 --enable-gnome-askpass will build the GNOME passphrase dialog. You
106 need a working installation of GNOME, including the development
107 headers, for this to work.
109 --with-random=/some/file allows you to specify an alternate source of
110 random numbers (the default is /dev/urandom). Unless you are absolutely
111 sure of what you are doing, it is best to leave this alone.
113 --with-egd-pool=/some/file allows you to enable Entropy Gathering
114 Daemon support and to specify a EGD pool socket. Use this if your
115 Unix lacks /dev/random and you don't want to use OpenSSH's builtin
116 entropy collection support.
118 --with-lastlog=FILE will specify the location of the lastlog file.
119 ./configure searches a few locations for lastlog, but may not find
120 it if lastlog is installed in a different place.
122 --without-lastlog will disable lastlog support entirely.
124 --with-kerberos4=PATH will enable Kerberos IV support. You will need
125 to have the Kerberos libraries and header files installed for this
126 to work. Use the optional PATH argument to specify the root of your
127 Kerberos installation.
129 --with-afs=PATH will enable AFS support. You will need to have the
130 Kerberos IV and the AFS libraries and header files installed for this
131 to work. Use the optional PATH argument to specify the root of your
132 AFS installation. AFS requires Kerberos support to be enabled.
134 --with-skey=PATH will enable S/Key one time password support. You will
135 need the S/Key libraries and header files installed for this to work.
137 --with-tcp-wrappers will enable TCP Wrappers (/etc/hosts.allow|deny)
138 support. You will need libwrap.a and tcpd.h installed.
140 --with-md5-passwords will enable the use of MD5 passwords. Enable this
141 if your operating system uses MD5 passwords without using PAM.
143 --with-utmpx enables utmpx support. utmpx support is automatic for
146 --without-shadow disables shadow password support.
148 --with-ipaddr-display forces the use of a numeric IP address in the
149 $DISPLAY environment variable. Some broken systems need this.
151 --with-default-path=PATH allows you to specify a default $PATH for sessions
152 started by sshd. This replaces the standard path entirely.
154 --with-pid-dir=PATH specifies the directory in which the ssh.pid file is
157 --with-xauth=PATH specifies the location of the xauth binary
159 --with-ipv4-default instructs OpenSSH to use IPv4 by default for new
160 connections. Normally OpenSSH will try attempt to lookup both IPv6 and
161 IPv4 addresses. On Linux/glibc-2.1.2 this causes long delays in name
162 resolution. If this option is specified, you can still attempt to
163 connect to IPv6 addresses using the command line option '-6'.
165 --with-ssl-dir=DIR allows you to specify where your OpenSSL libraries
168 --with-4in6 Check for IPv4 in IPv6 mapped addresses and convert them to
169 real (AF_INET) IPv4 addresses. Works around some quirks on Linux.
171 If you need to pass special options to the compiler or linker, you
172 can specify these as environment variables before running ./configure.
175 CFLAGS="-O -m486" LDFLAGS="-s" LIBS="-lrubbish" LD="/usr/foo/ld" ./configure
180 The runtime configuration files are installed by in ${prefix}/etc or
181 whatever you specified as your --sysconfdir (/usr/local/etc by default).
183 The default configuration should be instantly usable, though you should
184 review it to ensure that it matches your security requirements.
186 To generate a host key, run "make host-key". Alternately you can do so
187 manually using the following commands:
189 ssh-keygen -b 1024 -f /etc/ssh/ssh_host_key -N ""
190 ssh-keygen -d -f /etc/ssh/ssh_host_dsa_key -N ""
192 Replacing /etc/ssh with the correct path to the configuration directory.
193 (${prefix}/etc or whatever you specified with --sysconfdir during
196 If you have configured OpenSSH with EGD support, ensure that EGD is
197 running and has collected some Entropy.
199 For more information on configuration, please refer to the manual pages
200 for sshd, ssh and ssh-agent.
205 If you experience problems compiling, installing or running OpenSSH.
206 Please refer to the "reporting bugs" section of the webpage at
207 http://www.openssh.com/