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res_pjsip: Update authentication realm documentation.

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Using the same auth section for inbound and outbound authentication is not
recommended.  There is a difference in meaning for an empty realm setting
between inbound and outbound authentication uses.

An empty inbound auth realm represents the global section's default_realm
value when the authentication object is used to challenge an incoming
request.  An empty outgoing auth realm is treated as a don't care wildcard
when the authentication object is used to respond to an incoming
authentication challenge.

ASTERISK-26799

Change-Id: Id3952f7cfa1b6683b9954f2c5d2352d2f11059ce
This commit is contained in:
Richard Mudgett
2017-01-01 08:02:17 -06:00
parent 50e984115d
commit 0b660c9989
4 changed files with 86 additions and 11 deletions
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51
res/res_pjsip.c
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@@ -112,9 +112,15 @@
This is a comma-delimited list of <replaceable>auth</replaceable> sections defined
in <filename>pjsip.conf</filename> to be used to verify inbound connection attempts.
</para><para>
Endpoints without an <literal>authentication</literal> object
configured will allow connections without vertification.
</para></description>
Endpoints without an authentication object
configured will allow connections without verification.</para>
<note><para>
Using the same auth section for inbound and outbound
authentication is not recommended. There is a difference in
meaning for an empty realm setting between inbound and outbound
authentication uses. See the auth realm description for details.
</para></note>
</description>
</configOption>
<configOption name="callerid">
<synopsis>CallerID information for the endpoint</synopsis>
@@ -329,7 +335,18 @@
<synopsis>Default Music On Hold class</synopsis>
</configOption>
<configOption name="outbound_auth">
<synopsis>Authentication object used for outbound requests</synopsis>
<synopsis>Authentication object(s) used for outbound requests</synopsis>
<description><para>
This is a comma-delimited list of <replaceable>auth</replaceable>
sections defined in <filename>pjsip.conf</filename> used to respond
to outbound connection authentication challenges.</para>
<note><para>
Using the same auth section for inbound and outbound
authentication is not recommended. There is a difference in
meaning for an empty realm setting between inbound and outbound
authentication uses. See the auth realm description for details.
</para></note>
</description>
</configOption>
<configOption name="outbound_proxy">
<synopsis>Proxy through which to send requests, a full SIP URI must be provided</synopsis>
@@ -967,8 +984,30 @@
<synopsis>PlainText password used for authentication.</synopsis>
<description><para>Only used when auth_type is <literal>userpass</literal>.</para></description>
</configOption>
<configOption name="realm" default="asterisk">
<configOption name="realm">
<synopsis>SIP realm for endpoint</synopsis>
<description><para>
The treatment of this value depends upon how the authentication
object is used.
</para><para>
When used as an inbound authentication object, the realm is sent
as part of the challenge so the peer can know which key to use
when responding. An empty value will use the
<replaceable>global</replaceable> section's
<literal>default_realm</literal> value when issuing a challenge.
</para><para>
When used as an outbound authentication object, the realm is
matched with the received challenge realm to determine which
authentication object to use when responding to the challenge. An
empty value matches any challenging realm when determining
which authentication object matches a received challenge.
</para>
<note><para>
Using the same auth section for inbound and outbound
authentication is not recommended. There is a difference in
meaning for an empty realm setting between inbound and outbound
authentication uses.</para></note>
</description>
</configOption>
<configOption name="type">
<synopsis>Must be 'auth'</synopsis>
@@ -1512,7 +1551,7 @@
used.</synopsis>
</configOption>
<configOption name="default_realm" default="asterisk">
<synopsis>When Asterisk generates an challenge, the digest will be
<synopsis>When Asterisk generates a challenge, the digest realm will be
set to this value if there is no better option (such as auth/realm) to be
used.</synopsis>
</configOption>