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authorIngela Anderton Andin <[email protected]>2017-10-06 17:24:16 +0200
committerIngela Anderton Andin <[email protected]>2017-10-13 11:35:39 +0200
commit0bb96516ce308b6fb837696338b492d3c9a9f429 (patch)
tree4daf04a9d86159bf803db457eda16c4199992afa /lib/ssl/doc
parent4f4bf872831b12cac8913e8a62e35725d0173b0d (diff)
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ssl: Extend hostname check to fallback to checking IP-address
If no SNI is available and the hostname is an IP-address also check for IP-address match. This check is not as good as a DNS hostname check and certificates using IP-address are not recommended.
Diffstat (limited to 'lib/ssl/doc')
-rw-r--r--lib/ssl/doc/src/ssl.xml52
1 files changed, 36 insertions, 16 deletions
diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml
index ca2dcbb761..e80fd59a7f 100644
--- a/lib/ssl/doc/src/ssl.xml
+++ b/lib/ssl/doc/src/ssl.xml
@@ -589,22 +589,19 @@ fun(srp, Username :: string(), UserState :: term()) ->
<tag><c>{server_name_indication, HostName :: hostname()}</c></tag>
<item><p>Specify the hostname to be used in TLS Server Name Indication extension.
- Is usefull when upgrading a TCP socket to a TLS socket or if the hostname can not be
- derived from the Host argument to <seealso marker="ssl#connect-3">ssl:connect/3</seealso>.
- Will also cause the client to preform host name verification of the peer certificate
- <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname(PeerCert, [{dns_id, HostName}])</seealso>
- </p> during the x509-path validation. If the check fails the error {bad_cert, hostname_check_failiure} will be
- propagated to the path validation fun <seealso marker="#verify_fun">verify_fun</seealso>
- </item>
-
- <tag><c>{server_name_indication, disable}</c></tag>
- <item>
- <p>When starting a TLS connection without upgrade, the Server Name
- Indication extension is sent if possible that is can be derived from the Host argument
- to <seealso marker="ssl#connect-3">ssl:connect/3</seealso>.
- This option can be used to disable that behavior.</p>
- <note><p> Note that this also disables the default host name verification check of the peer certificate.</p></note>
+ If not specified it will default to the <c>Host</c> argument of <seealso marker="#connect-3">connect/[3,4]</seealso>
+ unless it is of type inet:ipaddress().</p>
+ <p>
+ The <c>HostName</c> will also be used in the hostname verification of the peer certificate using
+ <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>.
+ </p>
</item>
+ <tag><c>{server_name_indication, disable}</c></tag>
+ <item>
+ <p> Prevents the Server Name Indication extension from being sent and
+ disables the hostname verification check
+ <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> </p>
+ </item>
<tag><c>{fallback, boolean()}</c></tag>
<item>
<p> Send special cipher suite TLS_FALLBACK_SCSV to avoid undesired TLS version downgrade.
@@ -881,6 +878,12 @@ fun(srp, Username :: string(), UserState :: term()) ->
<desc><p>Upgrades a <c>gen_tcp</c>, or equivalent,
connected socket to an SSL socket, that is, performs the
client-side ssl handshake.</p>
+
+ <note><p>If the option <c>verify</c> is set to <c>verify_peer</c>
+ the option <c>server_name_indication</c> shall also be specified,
+ if it is not no Server Name Indication extension will be sent,
+ and <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>
+ will be called with the IP-address of the connection as <c>ReferenceID</c>, which is proably not what you want.</p></note>
</desc>
</func>
@@ -897,7 +900,24 @@ fun(srp, Username :: string(), UserState :: term()) ->
<v>SslSocket = sslsocket()</v>
<v>Reason = term()</v>
</type>
- <desc><p>Opens an SSL connection to <c>Host</c>, <c>Port</c>.</p></desc>
+ <desc><p>Opens an SSL connection to <c>Host</c>, <c>Port</c>.</p>
+
+ <p> When the option <c>verify</c> is set to <c>verify_peer</c> the check
+ <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>
+ will be performed in addition to the usual x509-path validation checks. If the check fails the error {bad_cert, hostname_check_failed} will
+ be propagated to the path validation fun <seealso marker="#verify_fun">verify_fun</seealso>, where it is possible to do customized
+ checks by using the full possibilitis of the <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> API.
+
+ When the option <c>server_name_indication</c> is provided, its value (the DNS name) will be used as <c>ReferenceID</c>
+ to <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>.
+ When no <c>server_name_indication</c> option is given, the <c>Host</c> argument will be used as
+ Server Name Indication extension. The <c>Host</c> argument will also be used for the
+ <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> check and if the <c>Host</c>
+ argument is an <c>inet:ip_address()</c> the <c>ReferenceID</c> used for the check will be <c>{ip, Host}</c> otherwise
+ <c>dns_id</c> will be assumed with a fallback to <c>ip</c> if that fails. </p>
+ <note><p>According to good practices certificates should not use IP-addresses as "server names". It would
+ be very surprising if this happen outside a closed network. </p></note>
+ </desc>
</func>
<func>