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1 | 1. Prerequisites | |
2 | ---------------- | |
3 | ||
4 | You will need working installations of Zlib and OpenSSL. | |
5 | ||
6 | Zlib: | |
7 | http://www.freesoftware.com/pub/infozip/zlib/ | |
8 | ||
9 | OpenSSL 0.9.5a or greater: | |
10 | http://www.openssl.org/ | |
11 | ||
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 | |
14 | these. | |
15 | ||
16 | OpenSSH can utilise Pluggable Authentication Modules (PAM) if your system | |
17 | supports it. PAM is standard on Redhat and Debian Linux, Solaris and | |
18 | HP-UX 11. | |
19 | ||
20 | PAM: | |
21 | http://www.kernel.org/pub/linux/libs/pam/ | |
22 | ||
23 | If you wish to build the GNOME passphrase requester, you will need the GNOME | |
24 | libraries and headers. | |
25 | ||
26 | GNOME: | |
27 | http://www.gnome.org/ | |
28 | ||
29 | Alternatively, Jim Knoble <jmknoble@jmknoble.cx> has written an excellent X11 | |
30 | passphrase requester. This is maintained separately at: | |
31 | ||
32 | http://www.ntrnet.net/~jmknoble/software/x11-ssh-askpass/index.html | |
33 | ||
34 | PRNGD: | |
35 | ||
36 | If your system lacks Kernel based random collection, the use of Lutz | |
37 | Jaenicke's PRNGd is recommended. | |
38 | ||
39 | http://www.aet.tu-cottbus.de/personen/jaenicke/postfix_tls/prngd.html | |
40 | ||
41 | EGD: | |
42 | ||
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. | |
45 | ||
46 | http://www.lothar.com/tech/crypto/ | |
47 | ||
48 | GNU Make: | |
49 | ftp://ftp.gnu.org/gnu/make/ | |
50 | ||
51 | OpenSSH has only been tested with GNU make. It may work with other | |
52 | 'make' programs, but you are on your own. | |
53 | ||
54 | PCRE (PERL-compatible Regular Expression library): | |
55 | ftp://ftp.cus.cam.ac.uk/pub/software/programs/pcre/ | |
56 | ||
57 | Most platforms do not require this. However older Unices may not have a | |
58 | posix regex library. PCRE provides a POSIX interface. | |
59 | ||
60 | S/Key Libraries: | |
61 | http://www.sparc.spb.su/solaris/skey/ | |
62 | ||
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 | |
65 | supported. | |
66 | ||
67 | 2. Building / Installation | |
68 | -------------------------- | |
69 | ||
70 | To install OpenSSH with default options: | |
71 | ||
72 | ./configure | |
73 | make | |
74 | make install | |
75 | ||
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: | |
79 | ||
80 | ./configure --prefix=/opt | |
81 | make | |
82 | make install | |
83 | ||
84 | Will install OpenSSH in /opt/{bin,etc,lib,sbin}. You can also override | |
85 | specific paths, for example: | |
86 | ||
87 | ./configure --prefix=/opt --sysconfdir=/etc/ssh | |
88 | make | |
89 | make install | |
90 | ||
91 | This will install the binaries in /opt/{bin,lib,sbin}, but will place the | |
92 | configuration files in /etc/ssh. | |
93 | ||
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 | |
103 | name). | |
104 | ||
105 | There are a few other options to the configure script: | |
106 | ||
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 | |
110 | different name. | |
111 | ||
112 | --with-pam enables PAM support. | |
113 | ||
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. | |
117 | ||
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. | |
121 | ||
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 | |
125 | collection support. | |
126 | ||
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 | |
130 | collection support. | |
131 | ||
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. | |
135 | ||
136 | --without-lastlog will disable lastlog support entirely. | |
137 | ||
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. | |
142 | ||
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. | |
147 | ||
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. | |
150 | ||
151 | --with-tcp-wrappers will enable TCP Wrappers (/etc/hosts.allow|deny) | |
152 | support. You will need libwrap.a and tcpd.h installed. | |
153 | ||
154 | --with-md5-passwords will enable the use of MD5 passwords. Enable this | |
155 | if your operating system uses MD5 passwords without using PAM. | |
156 | ||
157 | --with-utmpx enables utmpx support. utmpx support is automatic for | |
158 | some platforms. | |
159 | ||
160 | --without-shadow disables shadow password support. | |
161 | ||
162 | --with-ipaddr-display forces the use of a numeric IP address in the | |
163 | $DISPLAY environment variable. Some broken systems need this. | |
164 | ||
165 | --with-default-path=PATH allows you to specify a default $PATH for sessions | |
166 | started by sshd. This replaces the standard path entirely. | |
167 | ||
168 | --with-pid-dir=PATH specifies the directory in which the ssh.pid file is | |
169 | created. | |
170 | ||
171 | --with-xauth=PATH specifies the location of the xauth binary | |
172 | ||
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'. | |
178 | ||
179 | --with-ssl-dir=DIR allows you to specify where your OpenSSL libraries | |
180 | are installed. | |
181 | ||
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. | |
184 | ||
185 | If you need to pass special options to the compiler or linker, you | |
186 | can specify these as environment variables before running ./configure. | |
187 | For example: | |
188 | ||
189 | CFLAGS="-O -m486" LDFLAGS="-s" LIBS="-lrubbish" LD="/usr/foo/ld" ./configure | |
190 | ||
191 | 3. Configuration | |
192 | ---------------- | |
193 | ||
194 | The runtime configuration files are installed by in ${prefix}/etc or | |
195 | whatever you specified as your --sysconfdir (/usr/local/etc by default). | |
196 | ||
197 | The default configuration should be instantly usable, though you should | |
198 | review it to ensure that it matches your security requirements. | |
199 | ||
200 | To generate a host key, run "make host-key". Alternately you can do so | |
201 | manually using the following commands: | |
202 | ||
203 | ssh-keygen -t rsa1 -f /etc/ssh/ssh_host_key -N "" | |
204 | ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" | |
205 | ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N "" | |
206 | ||
207 | Replacing /etc/ssh with the correct path to the configuration directory. | |
208 | (${prefix}/etc or whatever you specified with --sysconfdir during | |
209 | configuration) | |
210 | ||
211 | If you have configured OpenSSH with EGD support, ensure that EGD is | |
212 | running and has collected some Entropy. | |
213 | ||
214 | For more information on configuration, please refer to the manual pages | |
215 | for sshd, ssh and ssh-agent. | |
216 | ||
217 | 4. Problems? | |
218 | ------------ | |
219 | ||
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/ | |
223 | ||
224 | ||
225 | $Id$ |