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.
13 For Red Hat Linux 6.2, they have been released as errata. RHL7 includes
16 OpenSSH can utilise Pluggable Authentication Modules (PAM) if your system
17 supports it. PAM is standard on Redhat and Debian Linux, Solaris and
21 http://www.kernel.org/pub/linux/libs/pam/
23 If you wish to build the GNOME passphrase requester, you will need the GNOME
24 libraries and headers.
29 Alternatively, Jim Knoble <jmknoble@jmknoble.cx> has written an excellent X11
30 passphrase requester. This is maintained separately at:
32 http://www.ntrnet.net/~jmknoble/software/x11-ssh-askpass/index.html
36 If your system lacks Kernel based random collection, the use of Lutz
37 Jaenicke's PRNGd is recommended.
39 http://www.aet.tu-cottbus.de/personen/jaenicke/postfix_tls/prngd.html
43 The Entropy Gathering Daemon (EGD) is supported if you have a system which
44 lacks /dev/random and don't want to use OpenSSH's internal entropy collection.
46 http://www.lothar.com/tech/crypto/
49 ftp://ftp.gnu.org/gnu/make/
51 OpenSSH has only been tested with GNU make. It may work with other
52 'make' programs, but you are on your own.
54 PCRE (PERL-compatible Regular Expression library):
55 ftp://ftp.cus.cam.ac.uk/pub/software/programs/pcre/
57 Most platforms do not require this. However older Unices may not have a
58 posix regex library. PCRE provides a POSIX interface.
61 http://www.sparc.spb.su/solaris/skey/
63 If you wish to use --with-skey then you will need the above library
64 installed. No other current S/Key library is currently known to be
67 2. Building / Installation
68 --------------------------
70 To install OpenSSH with default options:
76 This will install the OpenSSH binaries in /usr/local/bin, configuration files
77 in /usr/local/etc, the server in /usr/local/sbin, etc. To specify a different
78 installation prefix, use the --prefix option to configure:
80 ./configure --prefix=/opt
84 Will install OpenSSH in /opt/{bin,etc,lib,sbin}. You can also override
85 specific paths, for example:
87 ./configure --prefix=/opt --sysconfdir=/etc/ssh
91 This will install the binaries in /opt/{bin,lib,sbin}, but will place the
92 configuration files in /etc/ssh.
94 If you are using PAM, you may need to manually install a PAM
95 control file as "/etc/pam.d/sshd" (or wherever your system
96 prefers to keep them). A generic PAM configuration is included as
97 "contrib/sshd.pam.generic", you may need to edit it before using it on
98 your system. If you are using a recent version of Red Hat Linux, the
99 config file in contrib/redhat/sshd.pam should be more useful.
100 Failure to install a valid PAM file may result in an inability to
101 use password authentication. On HP-UX 11, the standard /etc/pam.conf
102 configuration will work with sshd (sshd will match the OTHER service
105 There are a few other options to the configure script:
107 --with-rsh=PATH allows you to specify the path to your rsh program.
108 Normally ./configure will search the current $PATH for 'rsh'. You
109 may need to specify this option if rsh is not in your path or has a
112 --with-pam enables PAM support.
114 --enable-gnome-askpass will build the GNOME passphrase dialog. You
115 need a working installation of GNOME, including the development
116 headers, for this to work.
118 --with-random=/some/file allows you to specify an alternate source of
119 random numbers (the default is /dev/urandom). Unless you are absolutely
120 sure of what you are doing, it is best to leave this alone.
122 --with-prngd-socket=/some/file allows you to enable EGD or PRNGD
123 support and to specify a PRNGd socket. Use this if your Unix lacks
124 /dev/random and you don't want to use OpenSSH's builtin entropy
127 --with-prngd-port=portnum allows you to enable EGD or PRNGD support
128 and to specify a EGD localhost TCP port. Use this if your Unix lacks
129 /dev/random and you don't want to use OpenSSH's builtin entropy
132 --with-lastlog=FILE will specify the location of the lastlog file.
133 ./configure searches a few locations for lastlog, but may not find
134 it if lastlog is installed in a different place.
136 --without-lastlog will disable lastlog support entirely.
138 --with-kerberos4=PATH will enable Kerberos IV support. You will need
139 to have the Kerberos libraries and header files installed for this
140 to work. Use the optional PATH argument to specify the root of your
141 Kerberos installation.
143 --with-afs=PATH will enable AFS support. You will need to have the
144 Kerberos IV and the AFS libraries and header files installed for this
145 to work. Use the optional PATH argument to specify the root of your
146 AFS installation. AFS requires Kerberos support to be enabled.
148 --with-skey=PATH will enable S/Key one time password support. You will
149 need the S/Key libraries and header files installed for this to work.
151 --with-tcp-wrappers will enable TCP Wrappers (/etc/hosts.allow|deny)
152 support. You will need libwrap.a and tcpd.h installed.
154 --with-md5-passwords will enable the use of MD5 passwords. Enable this
155 if your operating system uses MD5 passwords without using PAM.
157 --with-utmpx enables utmpx support. utmpx support is automatic for
160 --without-shadow disables shadow password support.
162 --with-ipaddr-display forces the use of a numeric IP address in the
163 $DISPLAY environment variable. Some broken systems need this.
165 --with-default-path=PATH allows you to specify a default $PATH for sessions
166 started by sshd. This replaces the standard path entirely.
168 --with-pid-dir=PATH specifies the directory in which the ssh.pid file is
171 --with-xauth=PATH specifies the location of the xauth binary
173 --with-ipv4-default instructs OpenSSH to use IPv4 by default for new
174 connections. Normally OpenSSH will try attempt to lookup both IPv6 and
175 IPv4 addresses. On Linux/glibc-2.1.2 this causes long delays in name
176 resolution. If this option is specified, you can still attempt to
177 connect to IPv6 addresses using the command line option '-6'.
179 --with-ssl-dir=DIR allows you to specify where your OpenSSL libraries
182 --with-4in6 Check for IPv4 in IPv6 mapped addresses and convert them to
183 real (AF_INET) IPv4 addresses. Works around some quirks on Linux.
185 If you need to pass special options to the compiler or linker, you
186 can specify these as environment variables before running ./configure.
189 CFLAGS="-O -m486" LDFLAGS="-s" LIBS="-lrubbish" LD="/usr/foo/ld" ./configure
194 The runtime configuration files are installed by in ${prefix}/etc or
195 whatever you specified as your --sysconfdir (/usr/local/etc by default).
197 The default configuration should be instantly usable, though you should
198 review it to ensure that it matches your security requirements.
200 To generate a host key, run "make host-key". Alternately you can do so
201 manually using the following commands:
203 ssh-keygen -t rsa1 -f /etc/ssh/ssh_host_key -N ""
204 ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ""
205 ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ""
207 Replacing /etc/ssh with the correct path to the configuration directory.
208 (${prefix}/etc or whatever you specified with --sysconfdir during
211 If you have configured OpenSSH with EGD support, ensure that EGD is
212 running and has collected some Entropy.
214 For more information on configuration, please refer to the manual pages
215 for sshd, ssh and ssh-agent.
220 If you experience problems compiling, installing or running OpenSSH.
221 Please refer to the "reporting bugs" section of the webpage at
222 http://www.openssh.com/