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.\" ========================================================================
.\"
.IX Title "Net::SIP::Authorize 3pm"
.TH Net::SIP::Authorize 3pm "2010-08-20" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Net::SIP::Authorize \- enforce authorization of packets
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 11
\&  my $auth = Net::SIP::Authorize\->new(
\&        dispatcher => $dispatcher,
\&        realm      => \*(Aqnet\-sip.example.com\*(Aq,
\&        user2pass  => \e&give_pass_for_user,
\&        i_am_proxy => 1,
\&  );
\&  my $proxy = Net::SIP::StatelessProxy\->new...
\&  my $chain = Net::SIP::ReceiveChain\->new(
\&        # all requests for proxy need to be authorized
\&        [ $auth,$proxy ]
\&  );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This package is used inside a Net::SIP::ReceiveChain to make sure,
that requests are authorized before they get handled by the next
receiver in the chain.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.ie n .IP "new ( %ARGS )" 4
.el .IP "new ( \f(CW%ARGS\fR )" 4
.IX Item "new ( %ARGS )"
This creates a new registar object, \f(CW%ARGS\fR can have the following keys:
.RS 4
.IP "dispatcher" 8
.IX Item "dispatcher"
Net::SIP::Dispatcher object manging the registar. Mandatory.
.IP "realm" 8
.IX Item "realm"
The realm for the authentication request. Defaults to 'p5\-net\-sip'.
.IP "opaque" 8
.IX Item "opaque"
Optional value for \f(CW\*(C`opaque\*(C'\fR parameter for the authentication request.
If none is given no \f(CW\*(C`opaque\*(C'\fR parameter will be used.
.IP "user2a1" 8
.IX Item "user2a1"
Either hash reference with \f(CW\*(C`user,a1_hex\*(C'\fR mapping or callback, which gives
\&\f(CW\*(C`a1_hex\*(C'\fR if called with \f(CW\*(C`user,realm\*(C'\fR.
For the meaning of \f(CW\*(C`a1_hex\*(C'\fR see \s-1RFC\s0 2617.
.IP "user2pass" 8
.IX Item "user2pass"
Either hash reference with \f(CW\*(C`user,password\*(C'\fR mapping or callback,
which gives \f(CW\*(C`password\*(C'\fR if called with \f(CW\*(C`user\*(C'\fR.
This parameter will only be used if \f(CW\*(C`user2a1\*(C'\fR does not result in
a defined \f(CW\*(C`a1_hex\*(C'\fR for \f(CW\*(C`user\*(C'\fR.
.IP "i_am_proxy" 8
.IX Item "i_am_proxy"
Flag if the object behind works as a proxy (e.g. Net::SIP::StatelessProxy)
and sends \f(CW\*(C`Proxy\-Authenticate\*(C'\fR or if it is an endpoint
(e.g. Net::SIP::Endpoint, Net::SIP::Registrar) which sends
\&\f(CW\*(C`WWW\-Authenticate\*(C'\fR.
.IP "filter" 8
.IX Item "filter"
Additional filter for authorization, e.g. if authorization based on
username and passwort succeeded it might still fail because of these
filters. Filter is a hash with the method as key.
.Sp
The value can be an additional authorization (in which case it
must succeed), a list of authorizations (all of them must succeed),
or a list with a list of authorizations (at least one of the inner
lists must succeed).
.Sp
The additional authorization can be a name of a Net::SIP::Authorize
subclass (e.g. \f(CW\*(C`ToIsFrom\*(C'\fR means \f(CW\*(C`Net::SIP::Authorize::ToIsFrom\*(C'\fR)
which has a \f(CW\*(C`verify\*(C'\fR function or a \f(CW\*(C`[\e&callback]\*(C'\fR.
.Sp
The verify function or callback will be called with
\&\f(CW\*(C`($packet,$leg,$addr,$auth_user,$auth_realm)\*(C'\fR where \f(CW$packet\fR is
the request, \f(CW$leg\fR the Net::SIP::Leg object where the packet
came in, \f(CW$addr\fR the senders address, \f(CW$auth_user\fR the
username from the authorized user and \f(CW$auth_realm\fR the realm
which was used for authorization.
Success for verification means that the function must return true.
.Sp
The following authorization subclasses are defined:
.RS 8
.IP "FromIsRealm" 4
.IX Item "FromIsRealm"
Succeeds if the senders domain is the realm or a subdomain of the realm.
.IP "FromIsAuthUser" 4
.IX Item "FromIsAuthUser"
Succeeds if the username of the sender equals the username used for
authorization.
.IP "ToIsFrom" 4
.IX Item "ToIsFrom"
Succeeds if To header equals From header. This can be used to make sure, that a
user can only call \s-1REGISTER\s0 for itself.
.RE
.RS 8
.Sp
Example:
.Sp
.Vb 9
\&  filter => {
\&    REGISTER => [
\&      # all of these must succeed
\&      [ \*(AqToIsFrom\*(Aq,\*(AqFromIsRealm\*(Aq,\*(AqFromIsAuthUser\*(Aq ],
\&      # or this
\&      [ \e&callback ],
\&    ],
\&    INVITE => \*(AqFromIsRealm\*(Aq,
\&  }
.Ve
.RE
.RE
.RS 4
.RE
.SH "METHODS"
.IX Header "METHODS"
.IP "receive ( \s-1PACKET\s0,LEG,FROM )" 4
.IX Item "receive ( PACKET,LEG,FROM )"
\&\s-1PACKET\s0 is the incoming packet,
\&\s-1LEG\s0 is the Net::SIP::Leg where the packet arrived and \s-1FROM\s0
is the \f(CW"ip:port"\fR of the sender. Responses will be send
back to the sender through the same leg.
.Sp
Called from the managing Net::SIP::Dispatcher object if a new
packet arrives.
.Sp
Returns \s-1TRUE\s0 if the packet was fully handled by this object which
is the case, if the packet was not authorized so that a \f(CW401\fR
or \f(CW407\fR (if \f(CW\*(C`i_am_proxy\*(C'\fR) response was send back.
.Sp
Returns \s-1FALSE\s0 if packet was authorized and should be handled
be the next object in the Net::SIP::ReceiveChain.
In this case it usually changes the packet to remove the local
authorization information.