1 INSTALLATION INSTRUCTIONS for SECNET
3 USE AT YOUR OWN RISK. THIS IS ALPHA TEST SOFTWARE. I DO NOT
4 GUARANTEE THAT THERE WILL BE PROTOCOL COMPATIBILITY BETWEEN DIFFERENT
9 ** System software support
11 Ensure that you have libgmp3-dev and adns installed (and bison and
12 flex, and for that matter gcc...).
14 [On BSD install /usr/ports/devel/bison]
16 If you intend to configure secnet to obtain packets from the kernel
17 through userv-ipif, install and configure userv-ipif. It is part of
18 userv-utils, available from ftp.chiark.greenend.org.uk in
21 If you intend to configure secnet to obtain packets from the kernel
22 using the universal TUN/TAP driver, make sure it's configured in your
23 kernel (it's under "network device support" in Linux-2.4) and that
24 you've created the appropriate device files; see
25 linux/Documentation/networking/tuntap.txt
27 If you're using TUN/TAP on a platform other than Linux-2.4, see
28 http://vtun.sourceforge.net/tun/
30 You will probably be using the supplied `make-secnet-sites' program to
31 generate your VPN's list of sites as a secnet configuration from a
32 more-human-writeable form. If so you need to install the standard
33 `ipaddr' Python module (python-ipaddr on Debian-derived systems).
35 ** System and network configuration
37 If you intend to start secnet as root, I suggest you create a userid
38 for it to run as once it's ready to drop its privileges. Example (on
40 # adduser --system --no-create-home secnet
42 If you're using the 'soft routes' feature (for some classes of mobile
43 device) you'll have to run as root all the time, to enable secnet to
44 add and remove routes from your kernel's routing table. (This
45 restriction may be relaxed later if someone writes a userv service to
46 modify the routing table.)
48 If you are joining an existing VPN, read that VPN's documentation now.
49 It may supersede the next paragraph.
51 In most configurations, you will need to allocate two IP addresses for
52 use by secnet. One will be for the tunnel interface on your tunnel
53 endpoint machine (i.e. the address you see in 'ifconfig' when you look
54 at the tunnel interface). The other will be for secnet itself. These
55 addresses should probably be allocated from the range used by your
56 internal network: if you do this, you should provide appropriate
57 proxy-ARP on the internal network interface of the machine running
58 secnet (eg. add an entry net/ipv4/conf/eth_whatever/proxy_arp = 1 to
59 /etc/sysctl.conf on Debian systems and run sysctl -p). Alternatively
60 the addresses could be from some other range - this works well if the
61 machine running secnet is the default route out of your network - but
62 this requires more thought.
64 http://www.ucam.org/cam-grin/ may be useful.
68 If you installed the Debian package of secnet, skip to "If installing
69 for the first time", below, and note that example.conf can be found in
70 /usr/share/doc/secnet/examples.
79 (Note: you may see the following warning while compiling
80 conffile.tab.c; this is a bug in bison-1.28:
81 /usr/share/bison/bison.simple: In function `yyparse':
82 /usr/share/bison/bison.simple:285: warning: `yyval' might be used
83 uninitialized in this function
85 You may if you wish apply the following patch to bison.simple:
86 diff -pu -r1.28.0.1 -r1.28.0.3
87 --- bison.s1 1999/08/30 19:23:24 1.28.0.1
88 +++ bison.s1 1999/08/30 21:15:18 1.28.0.3
89 @@ -523,8 +523,14 @@ yydefault:
90 /* Do a reduction. yyn is the number of a rule to reduce with. */
94 - yyval = yyvsp[1-yylen]; /* implement default value of the action */
96 + /* If yylen is nonzero, implement the default value of the action.
97 + Otherwise, the following line sets yyval to the semantic value of
98 + the lookahead token. This behavior is undocumented and bison
99 + users should not rely upon it. Assigning to yyval
100 + unconditionally makes the parser a bit smaller, and it avoids a
101 + GCC warning that yyval may be used uninitialized. */
102 + yyval = yyvsp[1-yylen];
108 Any other warnings or errors should be reported to
109 steve@greenend.org.uk.
111 If installing for the first time, do
113 # cp example.conf /etc/secnet/secnet.conf
115 # ssh-keygen -f key -t rsa1 -N ""
117 (You may need ssh-keygen1, instead, which might be found in
118 openssh-client-ssh1.)
121 $ LDFLAGS="-L/usr/local/lib" ./configure
122 $ gmake CFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib"
123 XXX this should eventually be worked out automatically by 'configure'.]
125 Generate a site file fragment for your site (see your VPN's
126 documentation, or see below), and submit it for inclusion in your
127 VPN's 'sites' file. Download the vpn-sites file to /etc/secnet/sites
128 - MAKE SURE YOU GET AN AUTHENTIC COPY because the sites file contains
129 public keys for all the sites in the VPN. Use the make-secnet-sites
130 program provided with the secnet distribution to convert the
131 distributed sites file into one that can be included in a secnet
134 # make-secnet-sites /etc/secnet/sites /etc/secnet/sites.conf
138 Should be reasonably obvious - edit /etc/secnet/secnet.conf as
139 prompted by the comments in example.conf. XXX Fuller documentation of
140 the configuration file format should be forthcoming in time. Its
141 syntax is described in the README file at the moment.
143 * Constructing your site file fragment
145 You need the following information:
147 1. the name of your VPN.
149 2. the name of your location(s).
151 3. a short name for your site, eg. "sinister". This is used to
152 identify your site in the vpn-sites file, and should probably be the
153 same as its hostname.
155 4. the DNS name of the machine that will be the "front-end" for your
156 secnet installation. This will typically be the name of the gateway
157 machine for your network, eg. sinister.dynamic.greenend.org.uk
159 secnet does not actually have to run on this machine, as long as the
160 machine can be configured to forward UDP packets to the machine that
163 5. the port number used to contact secnet at your site. This is the
164 port number on the front-end machine, and does not necessarily have to
165 match the port number on the machine running secnet. If you want to
166 use a privileged port number we suggest 410. An appropriate
167 unprivileged port number is 51396.
169 6. the list of networks accessible at your site over the VPN.
171 7. the public part of the RSA key you generated during installation
172 (in /etc/secnet/key.pub if you followed the installation
173 instructions). This file contains three numbers and a comment on one
176 If you are running secnet on a particularly slow machine, you may like
177 to specify a larger value for the key setup retry timeout than the
178 default, to prevent unnecessary retransmissions of key setup packets.
179 See the notes in the example configuration file for more on this.
181 The site file fragment should look something like this:
185 contact steve@greenend.org.uk
187 networks 192.168.73.0/24 192.168.1.0/24 172.19.71.0/24
188 address sinister.dynamic.greenend.org.uk 51396
189 pubkey 1024 35 142982503......[lots more].....0611 steve@sinister