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-rw-r--r--lib/ssl/doc/src/ssl_distribution.xml128
1 files changed, 106 insertions, 22 deletions
diff --git a/lib/ssl/doc/src/ssl_distribution.xml b/lib/ssl/doc/src/ssl_distribution.xml
index 61f88e3860..7f8a08f704 100644
--- a/lib/ssl/doc/src/ssl_distribution.xml
+++ b/lib/ssl/doc/src/ssl_distribution.xml
@@ -4,7 +4,7 @@
<chapter>
<header>
<copyright>
- <year>2000</year><year>2016</year>
+ <year>2000</year><year>2017</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -180,10 +180,96 @@ Eshell V5.0 (abort with ^G)
<section>
<title>Specifying SSL Options</title>
- <p>For SSL to work, at least
- a public key and a certificate must be specified for the server
- side. In the following example, the PEM-files consist of two
- entries, the server certificate and its private key.</p>
+
+ <p>
+ The SSL distribution options can be written into a file
+ that is consulted when the node is started. This file name
+ is then specified with the command line argument
+ <c>-ssl_dist_optfile</c>.
+ </p>
+ <p>
+ Any available SSL option can be specified in an options file,
+ but note that options that take a <c>fun()</c> has to use
+ the syntax <c>fun Mod:Func/Arity</c> since a function
+ body can not be compiled when consulting a file.
+ </p>
+ <p>
+ Do not tamper with the socket options
+ <c>list</c>, <c>binary</c>, <c>active</c>, <c>packet</c>,
+ <c>nodelay</c> and <c>deliver</c> since they are used
+ by the distribution protocol handler itself.
+ Other raw socket options such as <c>packet_size</c> may
+ interfere severely, so beware!
+ </p>
+ <p>
+ For SSL to work, at least a public key and a certificate
+ must be specified for the server side.
+ In the following example, the PEM file
+ <c>"/home/me/ssl/erlserver.pem"</c> contains both
+ the server certificate and its private key.
+ </p>
+ <p>
+ Create a file named for example
+ <c>"/home/me/ssl/[email protected]"</c>:
+ </p>
+ <code type="none"><![CDATA[
+[{server,
+ [{certfile, "/home/me/ssl/erlserver.pem"},
+ {secure_renegotiate, true}]},
+ {client,
+ [{secure_renegotiate, true}]}].]]>
+ </code>
+ <p>
+ And then start the node like this
+ (line breaks in the command are for readability,
+ and shall not be there when typed):
+ </p>
+ <code type="none"><![CDATA[
+$ erl -boot /home/me/ssl/start_ssl -proto_dist inet_tls
+ -ssl_dist_optfile "/home/me/ssl/[email protected]"
+ -sname ssl_test]]>
+ </code>
+ <p>
+ The options in the <c>{server, Opts}</c> tuple are used
+ when calling <c>ssl:ssl_accept/3</c>, and the options in the
+ <c>{client, Opts}</c> tuple are used when calling
+ <c>ssl:connect/4</c>.
+ </p>
+ <p>
+ For the client, the option
+ <c>{server_name_indication, atom_to_list(TargetNode)}</c>
+ is added when connecting.
+ This makes it possible to use the client option
+ <c>{verify, verify_peer}</c>,
+ and the client will verify that the certificate matches
+ the node name you are connecting to.
+ This only works if the the server certificate is issued
+ to the name <c>atom_to_list(TargetNode)</c>.
+ </p>
+ <p>
+ For the server it is also possible to use the option
+ <c>{verify, verify_peer}</c> and the server will only accept
+ client connections with certificates that are trusted by
+ a root certificate that the server knows.
+ A client that presents an untrusted certificate will be rejected.
+ This option is preferably combined with
+ <c>{fail_if_no_peer_cert, true}</c> or a client will
+ still be accepted if it does not present any certificate.
+ </p>
+ <p>
+ A node started in this way is fully functional, using SSL
+ as the distribution protocol.
+ </p>
+ </section>
+
+ <section>
+ <title>Specifying SSL Options (Legacy)</title>
+
+ <p>
+ As in the previous section the PEM file
+ <c>"/home/me/ssl/erlserver.pem"</c> contains both
+ the server certificate and its private key.
+ </p>
<p>On the <c>erl</c> command line you can specify options that the
SSL distribution adds when creating a socket.</p>
@@ -226,24 +312,26 @@ Eshell V5.0 (abort with ^G)
SSL options and their values. Argument <c>-ssl_dist_opt</c> can
be repeated any number of times.</p>
- <p>An example command line can now look as follows
+ <p>
+ An example command line doing the same as the example
+ in the previous section can now look as follows
(line breaks in the command are for readability,
- and are not be there when typed):</p>
- <code type="none">
+ and shall not be there when typed):
+ </p>
+ <code type="none"><![CDATA[
$ erl -boot /home/me/ssl/start_ssl -proto_dist inet_tls
- -ssl_dist_opt server_certfile "/home/me/ssl/erlserver.pem"
+ -ssl_dist_opt server_certfile "/home/me/ssl/erlserver.pem"
-ssl_dist_opt server_secure_renegotiate true client_secure_renegotiate true
-sname ssl_test
Erlang (BEAM) emulator version 5.0 [source]
-
+
Eshell V5.0 (abort with ^G)
-(ssl_test@myhost)1> </code>
- <p>A node started in this way is fully functional, using SSL
- as the distribution protocol.</p>
+(ssl_test@myhost)1>]]>
+ </code>
</section>
<section>
- <title>Setting up Environment to Always Use SSL</title>
+ <title>Setting up Environment to Always Use SSL (Legacy)</title>
<p>A convenient way to specify arguments to Erlang is to use environment
variable <c>ERL_FLAGS</c>. All the flags needed to
use the SSL distribution can be specified in that variable and are
@@ -285,15 +373,11 @@ Eshell V5.0 (abort with ^G)
variable.</p>
<p>An example command line with this option would look like this:</p>
- <code type="none">
+ <code type="none"><![CDATA[
$ erl -boot /home/me/ssl/start_ssl -proto_dist inet6_tls
- -ssl_dist_opt server_certfile "/home/me/ssl/erlserver.pem"
- -ssl_dist_opt server_secure_renegotiate true client_secure_renegotiate true
- -sname ssl_test
-Erlang (BEAM) emulator version 5.0 [source]
-
-Eshell V5.0 (abort with ^G)
-(ssl_test@myhost)1> </code>
+ -ssl_dist_optfile "/home/me/ssl/[email protected]"
+ -sname ssl_test]]>
+ </code>
<p>A node started in this way will only be able to communicate with
other nodes using SSL distribution over IPv6.</p>