You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
kamailio/modules/permissions/doc/permissions_admin.xml

1411 lines
40 KiB

<?xml version="1.0" encoding='ISO-8859-1'?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
<!-- Include general documentation entities -->
<!ENTITY % docentities SYSTEM "../../../docbook/entities.xml">
%docentities;
]>
<!-- Module User's Guide -->
<chapter>
<title>&adminguide;</title>
<section>
<title>Overview</title>
<para>
The Permissions module provides functions for handling
IP based access control lists (ACL) in a number of ways.
<itemizedlist>
<listitem><para>
Call Routing
</para></listitem>
<listitem><para>
Registration permissions
</para></listitem>
<listitem><para>
URI permissions
</para></listitem>
<listitem><para>
Address permissions
</para></listitem>
<listitem><para>
Trusted Requests
</para></listitem>
</itemizedlist>
The Address permissions and Trusted request handling supports
using a database to load ACLs into RAM for fast processing.
</para>
<section id="sec-call-routing">
<title>Call Routing</title>
<para>
The module can be used to determine if a call has appropriate
permission to be established. Permission rules are stored in
plaintext configuration files similar to
<filename moreinfo="none">hosts.allow</filename> and <filename
moreinfo="none">hosts.deny</filename> files used by tcpd.
</para>
<para>
When <function moreinfo="none">allow_routing</function> function is
called it tries to find a rule that matches selected fields of the
message.
</para>
<para>
&kamailio; is a forking proxy and therefore a single message can be sent
to different destinations simultaneously. When checking permissions
all the destinations must be checked and if one of them fails, the
forwarding will fail.
</para>
<para>
The matching algorithm is as follows, first match wins:
</para>
<itemizedlist>
<listitem>
<para>
Create a set of pairs of form (From, R-URI of branch 1),
(From, R-URI of branch 2), etc.
</para>
</listitem>
<listitem>
<para>
Routing will be allowed when all pairs match an entry in the
allow file.
</para>
</listitem>
<listitem>
<para>
Otherwise routing will be denied when one of pairs matches an
entry in the deny file.
</para>
</listitem>
<listitem>
<para>
Otherwise, routing will be allowed.
</para>
</listitem>
</itemizedlist>
<para>
A non-existing permission control file is treated as if it were an
empty file. Thus, permission control can be turned off by providing
no permission control files.
</para>
<para>
From header field and Request-URIs are always compared with regular
expressions! For the syntax see the sample file:
<filename moreinfo="none">config/permissions.allow</filename>.
</para>
</section>
<section id="sec-registration-permissions">
<title>Registration Permissions</title>
<para>
In addition to call routing it is also possible to check REGISTER
messages and decide--based on the configuration files--whether the
message should be allowed and the registration accepted or not.
</para>
<para>
Main purpose of the function is to prevent registration of "prohibited"
IP addresses. One example, when a malicious user registers a contact
containing IP address of a PSTN gateway, he might be able to bypass
authorization checks performed by the SIP proxy. That is undesirable
and therefore attempts to register IP address of a PSTN gateway should
be rejected. Files <filename
moreinfo="none">config/register.allow</filename> and <filename
moreinfo="none">config/register.deny</filename> contain an example
configuration.
</para>
<para>
The function for registration checking is called <function
moreinfo="none">allow_register</function> and the algorithm is very
similar to the algorithm described in
<xref linkend="sec-call-routing"/>. The only difference is in the way
how pairs are created.
</para>
<para>
Instead of the From header field the function uses the To header field because
th To header field in REGISTER messages contains the URI of the person
being registered. Instead of the Request-URI of branches the function
uses the Contact header field.
</para>
<para>
Thus, the pairs used in matching will look like this: (To, Contact 1),
(To, Contact 2), (To, Contact 3), and so on..
</para>
<para>
The algorithm of matching is the same as described in
<xref linkend="sec-call-routing"/>.
</para>
</section>
<section id="sec-uri-permissions">
<title>URI Permissions</title>
<para>
The module can be used to determine if a request to a destination
is allowed, based on an URI stored in a pvar. Permission rules are
stored in plaintext configuration files similar to
<filename moreinfo="none">hosts.allow</filename> and
<filename moreinfo="none">hosts.deny</filename> used by tcpd.
</para>
<para>
When the <function moreinfo="none">allow_uri</function>
function is called, it tries to find a rule that matches
selected fields of the message.
The matching algorithm is as follows, where the first match wins:
</para>
<itemizedlist>
<listitem>
<para>
Create a pair &lt;From URI, URI stored in pvar&gt;.
</para>
</listitem>
<listitem>
<para>
Request will be allowed when the pair matches
an entry in the allow file.
</para>
</listitem>
<listitem>
<para>
Request will be denied when the pair
matches an entry in the deny file.
</para>
</listitem>
<listitem>
<para>
Otherwise, request will be allowed.
</para>
</listitem>
</itemizedlist>
<para>
A non-existing permission control file is treated as if it were an
empty file. Thus, permission control can be turned off by providing
no permission control files.
</para>
<para>
The From URI and the URI stored in pvar are always compared with regular
expressions! For the syntax see the sample file:
<filename moreinfo="none">config/permissions.allow</filename>.
</para>
</section>
<section id="sec-address-permissions">
<title>Address Permissions</title>
<para>
The module can be used to determine if an address (IP
address and port or DNS domain name) matches any of the
addresses stored in a cached &kamailio; database table.
IP addresses in the database table can be subnet addresses.
Port 0 in cached database table matches any port. The
address and port to be matched can be either taken from
the request (allow_source_address) or given as pvar
arguments (allow_address).
</para>
<para>
Addresses stored in the database table can be grouped
together into one or more groups specified by a group
identifier (positive integer value, i.e., equal or greater than 1).
The group identifier is given as an argument to the allow_address() and
allow_source_address() functions.
One group can contain all of the three types of addresses: exact
IP address, subnet IP address or DNS domain name.
</para>
<para>
When the argument is an IP address, it is tried to be matched with the
records from that group that are of type exact IP or subnet. If the
argument is not an IP it is tried to be matched
with the records that are DNS domain names. No DNS lookup is performed,
only strict matching.
</para>
<para>
As a side effect of matching the address, non-NULL tag
(see tag_col module parameter) is added as value to
peer_tag AVP if peer_tag_avp module parameter has been defined.
</para>
</section>
<section id="sec-trusted-requests">
<title>Trusted Requests</title>
<para>
The module can be used to determine if an incoming
request can be trusted without authentication.
</para>
<para>
When the <function moreinfo="none">allow_trusted</function>
function is called, it tries to find a rule that matches
the request. Rules contain the following fields:
&lt;source address, transport protocol, regular
expression&gt;.
</para>
<para>
A requests is accepted if there exists a rule, where
</para>
<itemizedlist>
<listitem>
<para>
source address is equal to the source address of
the request or the source address given in pvar,
</para>
</listitem>
<listitem>
<para>
transport protocol is either "ANY" or equal to
the transport protocol of request or the transport
protocol given in pvar, and
</para>
</listitem>
<listitem>
<para>
regular expression is either empty (NULL in
database) or matches the From URI of request.
</para>
</listitem>
</itemizedlist>
<para>
Otherwise the request is rejected.
</para>
<para>
As a side effect of accepting the request, the peer's
non-NULL tag (see tag_col module parameter) is added as value to
peer_tag AVP if the peer_tag_avp module parameter has been defined.
</para>
<para>
Rules are stored in a database table specified by the module
parameters. There is a module parameter called
<varname>db_mode</varname> that
determines if the rules are cached into memory for faster
matching or if the database is consulted for each invocation
of the allow_trusted() function call.
</para>
</section>
</section>
<section>
<title>Dependencies</title>
<section>
<title>&kamailio; Modules</title>
<para>
The following modules must be loaded before this module:
<itemizedlist>
<listitem>
<para>
<emphasis>No dependencies on other &kamailio; modules</emphasis>.
</para>
</listitem>
</itemizedlist>
</para>
</section>
<section>
<title>External Libraries or Applications</title>
<para>
The following libraries or applications must be installed before running
&kamailio; with this module loaded:
<itemizedlist>
<listitem>
<para>
<emphasis>None</emphasis>.
</para>
</listitem>
</itemizedlist>
</para>
</section>
</section>
<section>
<title>Parameters</title>
<section id ="permissions.p.default_allow_file">
<title><varname>default_allow_file</varname> (string)</title>
<para>
Default allow file used by the functions with no parameters. If you
don't specify a full pathname then the directory in which is the main
config file is located will be used.
</para>
<para>
<emphasis>
Default value is <quote>permissions.allow</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>default_allow_file</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "default_allow_file", "/etc/permissions.allow")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.default_deny_file">
<title><varname>default_deny_file</varname> (string)</title>
<para>
Default file containing deny rules. The file is used by functions
with no parameters. If you don't specify a full pathname then the
directory in which the main config file is located will be used.
</para>
<para>
<emphasis>
Default value is <quote>permissions.deny</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>default_deny_file</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "default_deny_file", "/etc/permissions.deny")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.check_all_branches">
<title><varname>check_all_branches</varname> (integer)</title>
<para>
If set then allow_routing functions will check Request-URI of all
branches (default). If disabled then only Request-URI of the first
branch will be checked.
</para>
<warning>
<para>
Do not disable this parameter unless you really know what you
are doing.
</para>
</warning>
<para>
<emphasis>
Default value is 1.
</emphasis>
</para>
<example>
<title>Set <varname>check_all_branches</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "check_all_branches", 0)
...
</programlisting>
</example>
</section>
<section id ="permissions.p.allow_suffix">
<title><varname>allow_suffix</varname> (string)</title>
<para>
Suffix to be appended to basename to create filename of the allow
file when version with one parameter of either
<function moreinfo="none">allow_routing</function> or
<function moreinfo="none">allow_register</function> is used.
</para>
<note>
<para>
Including leading dot.
</para>
</note>
<para>
<emphasis>
Default value is <quote>.allow</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>allow_suffix</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "allow_suffix", ".allow")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.deny_suffix">
<title><varname>deny_suffix</varname> (string)</title>
<para>
Suffix to be appended to basename to create filename of the deny file
when version with one parameter of either
<function moreinfo="none">allow_routing</function> or
<function moreinfo="none">allow_register</function> is used.
</para>
<note>
<para>
Including leading dot.
</para>
</note>
<para>
<emphasis>
Default value is <quote>.deny</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>deny_suffix</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "deny_suffix", ".deny")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.db_url">
<title><varname>db_url</varname> (string)</title>
<para>
This is URL of the database to be used to store rules used by
<function moreinfo="none">allow_trusted</function> function.
</para>
<para>
<emphasis>
Default value is <quote>NULL</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>db_url</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "db_url", "&exampledb;")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.address_table">
<title><varname>address_table</varname> (string)</title>
<para>
The name of the database table containing IP subnets and DNS domain names used by
<function moreinfo="none">allow_address</function> and
<function moreinfo="none">allow_source_address</function>
functions.
</para>
<para>
<emphasis>
Default value is <quote>address</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>address_table</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "address_table", "addr")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.grp_col">
<title><varname>grp_col</varname> (string)</title>
<para>
Name of address table column containing the group
identifier of the address.
</para>
<para>
<emphasis>
Default value is <quote>grp</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>grp_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "grp_col", "group_id")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.ip_addr_col">
<title><varname>ip_addr_col</varname> (string)</title>
<para>
Name of address table column containing the IP address
part of the address.
</para>
<para>
<emphasis>
Default value is <quote>ip_addr</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>ip_addr_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "ip_addr_col", "ip_address")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.mask_col">
<title><varname>mask_col</varname> (string)</title>
<para>
Name of address table column containing the network mask of
the address. Possible values are 0-32 for IPv4 and 0-128 for
IPv6 addresses.
</para>
<para>
<emphasis>
Default value is <quote>mask</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>mask_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "mask_col", "subnet_length")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.port_col">
<title><varname>port_col</varname> (string)</title>
<para>
Name of address table column containing the port
part of the address.
</para>
<para>
<emphasis>
Default value is <quote>port</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>port_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "port_col", "port")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.db_mode">
<title><varname>db_mode</varname> (integer)</title>
<para>
Database mode. 0 means non-caching, 1 means caching.
Valid only for the <function moreinfo="none">allow_trusted</function> function.
</para>
<para>
<emphasis>
Default value is 0 (non-caching).
</emphasis>
</para>
<example>
<title>Set <varname>db_mode</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "db_mode", 1)
...
</programlisting>
</example>
</section>
<section id ="permissions.p.trusted_table">
<title><varname>trusted_table</varname> (string)</title>
<para>
Name of database table containing the matching rules used by
the <function moreinfo="none">allow_trusted</function> function.
</para>
<para>
<emphasis>
Default value is <quote>trusted</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>trusted_table</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "trusted_table", "pbx")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.source_col">
<title><varname>source_col</varname> (string)</title>
<para>
Name of column in the <quote>trusted</quote> table containing the source IP
address that is matched against source IP address of
received request.
</para>
<para>
<emphasis>
Default value is <quote>src_ip</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>source_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "source_col", "source_ip_address")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.proto_col">
<title><varname>proto_col</varname> (string)</title>
<para>
Name of column in the <quote>trusted</quote> table containing the transport
protocol that is matched against transport protocol of
the received request. Possible values that can be stored in
proto_col are <quote>any</quote>, <quote>udp</quote>,
<quote>tcp</quote>, <quote>tls</quote>,
<quote>sctp</quote>, <quote>ws</quote>, <quote>wss</quote>,
and <quote>none</quote>. Value
<quote>any</quote> matches always and value
<quote>none</quote> never.
</para>
<para>
<emphasis>
Default value is <quote>proto</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>proto_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "proto_col", "transport")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.from_col">
<title><varname>from_col</varname> (string)</title>
<para>
Name of the column trusted table containing a regular
expression that is matched against the From URI.
</para>
<para>
<emphasis>
Default value is <quote>from_pattern</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>from_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "from_col", "regexp")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.ruri_col">
<title><varname>ruri_col</varname> (string)</title>
<para>
Name of the column trusted table containing a regular
expression that is matched against the Request URI.
</para>
<para>
<emphasis>
Default value is <quote>ruri_pattern</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>ruri_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "ruri_col", "regexp")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.tag_col">
<title><varname>tag_col</varname> (string)</title>
<para>
Name of the column in the <quote>address</quote> or
<quote>trusted</quote> table containing a string
that is added as value to peer_tag AVP if peer_tag AVP
has been defined and if the address or peer matches.
</para>
<para>
<emphasis>
Default value is <quote>tag</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>tag_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "tag_col", "peer_tag")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.priority_col">
<title><varname>priority_col</varname> (string)</title>
<para>
The column name used to store the priority of the corresponding rule from the database
row. Priority values should be integer. When db_mode is set to 1 (caching), priorities
are ordered from highest to lowest. In non-caching mode, priority order (ASC vs DESC)
is determined by database.
</para>
<para>
<emphasis>
Default value is <quote>priority</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>priority_col</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "priority_col", "column_name")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.peer_tag_avp">
<title><varname>peer_tag_avp</varname> (AVP string)</title>
<para>
If defined, the AVP will be
set as a side effect of <function moreinfo="none">allow_trusted</function>
call to not NULL tag column value of the matching peer.
</para>
<para>
<emphasis>
Default value is <quote>undefined</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>peer_tag_avp</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "peer_tag_avp", "$avp(i:707)")
...
</programlisting>
</example>
</section>
<section id ="permissions.p.peer_tag_mode">
<title><varname>peer_tag_mode</varname> (integer)</title>
<para>
Tag mode for <function moreinfo="none">allow_trusted</function>.
<quote>0</quote> sets only the tag of the first match.
<quote>1</quote> adds the tags of all matches to the avp. In addition
the return value of <function moreinfo="none">allow_trusted</function>
is the number of matches. This parameter is not used for address table matching functions.
</para>
<para>
<emphasis>
Default value is <quote>0</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>peer_tag_mode</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "peer_tag_mode", 1)
...
</programlisting>
</example>
</section>
<section id ="permissions.p.max_subnets">
<title><varname>max_subnets</varname> (int)</title>
<para>
The maximum number of subnet addresses to be loaded from
address table.
</para>
<para>
<emphasis>
Default value is <quote>512</quote>.
</emphasis>
</para>
<example>
<title>Set <varname>max_subnets</varname> parameter</title>
<programlisting format="linespecific">
...
modparam("permissions", "max_subnets", 1024)
...
</programlisting>
</example>
</section>
</section>
<section>
<title>Functions</title>
<section id ="permissions.f.allow_routing">
<title>
<function moreinfo="none">allow_routing()</function>
</title>
<para>
Returns true if all pairs constructed as described in <xref
linkend="sec-call-routing"/> have appropriate permissions according to
the configuration files. This function uses default configuration
files specified in <varname>default_allow_file</varname> and
<varname>default_deny_file</varname>.
</para>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_routing</function> usage</title>
<programlisting format="linespecific">
...
if (allow_routing()) {
t_relay();
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_routing_basename">
<title>
<function moreinfo="none">allow_routing(basename)</function>
</title>
<para>
Returns true if all pairs constructed as described in <xref
linkend="sec-call-routing"/> have appropriate permissions according
to the configuration files given as parameters.
</para>
<para>Meaning of the parameters is as follows:</para>
<itemizedlist>
<listitem>
<para><emphasis>basename</emphasis> - Basename from which allow
and deny filenames will be created by appending contents of
<varname>allow_suffix</varname> and <varname>deny_suffix</varname>
parameters.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
</itemizedlist>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_routing(basename)</function> usage</title>
<programlisting format="linespecific">
...
if (allow_routing("basename")) {
t_relay();
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_routing_fileargs">
<title>
<function moreinfo="none">allow_routing(allow_file,deny_file)</function>
</title>
<para>
Returns true if all pairs constructed as described in
<xref linkend="sec-call-routing"/> have appropriate permissions
according to the configuration files given as parameters.
</para>
<para>Meaning of the parameters is as follows:</para>
<itemizedlist>
<listitem>
<para><emphasis>allow_file</emphasis> - File containing allow rules.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
<listitem>
<para><emphasis>deny_file</emphasis> - File containing deny rules.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
</itemizedlist>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_routing(allow_file, deny_file)</function> usage</title>
<programlisting format="linespecific">
...
if (allow_routing("rules.allow", "rules.deny")) {
t_relay();
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_register">
<title>
<function moreinfo="none">allow_register(basename)</function>
</title>
<para>
The function returns true if all pairs constructed as described in <xref
linkend="sec-registration-permissions"/> have appropriate permissions
according to the configuration files given as parameters.
</para>
<para>Meaning of the parameters is as follows:</para>
<itemizedlist>
<listitem>
<para><emphasis>basename</emphasis> - Basename from which allow
and deny filenames will be created by appending contents of
<varname>allow_suffix</varname> and <varname>deny_suffix</varname>
parameters.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
</itemizedlist>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_register(basename)</function> usage</title>
<programlisting format="linespecific">
...
if (method=="REGISTER") {
if (allow_register("register")) {
save("location");
exit;
} else {
sl_send_reply("403", "Forbidden");
};
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_register_fileargs">
<title>
<function moreinfo="none">allow_register(allow_file, deny_file)</function>
</title>
<para>
The function returns true if all pairs constructed as described in
<xref linkend="sec-registration-permissions"/> have appropriate
permissions according to the configuration files given as parameters.
</para>
<para>Meaning of the parameters is as follows:</para>
<itemizedlist>
<listitem>
<para><emphasis>allow_file</emphasis> - File containing allow rules.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
<listitem>
<para><emphasis>deny_file</emphasis> - File containing deny rules.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
</itemizedlist>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_register(allow_file, deny_file)</function> usage</title>
<programlisting format="linespecific">
...
if (method=="REGISTER") {
if (allow_register("register.allow", "register.deny")) {
save("location");
exit;
} else {
sl_send_reply("403", "Forbidden");
};
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_uri">
<title>
<function moreinfo="none">allow_uri(basename, pvar)</function>
</title>
<para>
Returns true if the pair constructed as described in <xref
linkend="sec-uri-permissions"/> have appropriate permissions
according to the configuration files specified by the parameter.
</para>
<para>Meaning of the parameter is as follows:</para>
<itemizedlist>
<listitem>
<para><emphasis>basename</emphasis> - Basename from which allow
and deny filenames will be created by appending contents of
<varname>allow_suffix</varname> and <varname>deny_suffix</varname>
parameters.
</para>
<para>
If the parameter doesn't contain full pathname then the function
expects the file to be located in the same directory as the main
configuration file of the server.
</para>
</listitem>
<listitem>
<para><emphasis>pvar</emphasis> - Any
pseudo-variable defined in &kamailio;.
</para>
</listitem>
</itemizedlist>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_uri(basename, pvar)</function> usage</title>
<programlisting format="linespecific">
...
if (allow_uri("basename", "$rt")) { // Check Refer-To URI
t_relay();
};
if (allow_uri("basename", "$avp(i:705)") { // Check URI stored in $avp(i:705)
t_relay();
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_address">
<title>
<function moreinfo="none">allow_address(group_id, ip_addr_pvar, port_pvar)</function>
</title>
<para>
Returns true if the address and port given as values of pvar
arguments belonging to a group given as group_id argument
matches an IP subnet or a DNS domain name found in cached
address table.
</para>
<para>
When matching is done if the argument is an IP address, it is
matched with the records from that group that are of type exact
IP or subnet. If the argument is not an IP it is tried to be matched
with the records that are DNS domain names. No DNS lookup is performed,
only strict matching.
Cached address table entry containing port value <quote>0</quote>
matches any port. The <quote>group_id</quote> argument can be an integer
string or a pseudo variable.
</para>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_address()</function> usage</title>
<programlisting format="linespecific">
...
// Check if source address/port is in group 1
if (!allow_address("1", "$si", "$sp")) {
sl_send_reply("403", "Forbidden");
};
// Check address/port stored in AVPs src_adr/src_port is in group 2
$avp(dst_adr) = "sipdomain.com";
$avp(dst_port) = "0";
if (!allow_address("2", "$avp(dst_adr)", "$avp(dst_port)") {
sl_send_reply("403", "Forbidden");
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_source_address">
<title>
<function moreinfo="none">allow_source_address([group_id])</function>
</title>
<para>
Equal to <quote>allow_address(group_id, "$si", "$sp")</quote>. If 'group_id' is
missing, the function is equal to allow_address("1", "$si", "$sp").
</para>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_source_address(group_id)</function> usage</title>
<programlisting format="linespecific">
...
// Check source address/port of request
if (!allow_source_address("1")) {
sl_send_reply("403", "Forbidden");
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_source_address_group">
<title>
<function moreinfo="none">allow_source_address_group()</function>
</title>
<para>
Checks if source address/port is found in cached address or
subnet table in any group. If yes, returns that group.
If not returns -1. Port value 0 in cached address and
group table matches any port.
</para>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_source_address_group()</function> usage</title>
<programlisting format="linespecific">
...
$var(group) = allow_source_address_group();
if ($var(group) != -1) {
# do something with $var(group)
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_address_group">
<title>
<function moreinfo="none">allow_address_group(addr, port)</function>
</title>
<para>
Checks if address/port is found in cached address or
subnet table in any group. If yes, returns that group.
If not returns -1. Port value 0 in cached address and
group table matches any port. The parameters can be pseudo-variables.
</para>
<para>
This function can be used from ANY_ROUTE.
</para>
<example>
<title><function>allow_source_address_group()</function> usage</title>
<programlisting format="linespecific">
...
$var(group) = allow_address_group("1.2.3.4", "5060");
if ($var(group) != -1) {
# do something with $var(group)
};
...
</programlisting>
</example>
</section>
<section id ="permissions.f.allow_trusted">
<title>
<function moreinfo="none">allow_trusted([src_ip_pvar, proto_pvar])</function>
</title>
<para>
Checks based either on request's source address and transport
protocol or source address and transport protocol given
in pvar arguments, and From URI of request
if request can be trusted without
authentication. Returns <quote>1</quote> if a match is found
as described in <xref linkend="sec-trusted-requests"/>
and <quote>-1</quote> otherwise. If a match is found
and <varname>peer_tag_avp</varname> has been defined, adds a
non-NULL tag column value of the
matching peer to AVP peer_tag_avp.
</para>
<para>
Source address and transport protocol given in pvar
arguments must be in string format. Valid transport
protocol values are (ignoring case) "any", "udp, "tcp", "tls",
"ws", "wss" and "sctp".
</para>
<para>
This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
</para>
<example>
<title><function>allow_trusted()</function> usage</title>
<programlisting format="linespecific">
...
if (allow_trusted()) {
t_relay();
};
...
if (allow_trusted("$si", "$proto")) {
t_relay();
};
...
</programlisting>
</example>
</section>
</section>
<section>
<title>MI Commands</title>
<section id ="permissions.m.address_reload">
<title>
<function moreinfo="none">address_reload</function>
</title>
<para>
Causes the permissions module to re-read the contents of
address database table into cache memory.
The in-cache memory entries are
for performance reasons stored in two
different tables: address table and
subnet table depending on the value of
the mask field (32 or smaller).
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.address_dump">
<title>
<function moreinfo="none">address_dump</function>
</title>
<para>
Causes permissions module to dump
contents of cache memory address table.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.subnet_dump">
<title>
<function moreinfo="none">subnet_dump</function>
</title>
<para>
Causes permissions module to dump
contents of cache memory subnet table.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.perm_domain_dump">
<title>
<function moreinfo="none">perm_domain_dump</function>
</title>
<para>
Causes permissions module to dump
contents of cache memory domain table.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.trusted_reload">
<title>
<function moreinfo="none">trusted_reload</function>
</title>
<para>
Causes the permissions module to re-read the contents of
trusted table into cache memory.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.trusted_dump">
<title>
<function moreinfo="none">trusted_dump</function>
</title>
<para>
Causes the permissions module to dump the
contents of trusted table from cache memory.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.m.allow_uri">
<title>
<function moreinfo="none">allow_uri</function>
</title>
<para>
Tests if (URI, Contact) pair is allowed according to
the allow/deny files. The files must already have been
loaded by &kamailio;.
</para>
<para>Parameters: </para>
<itemizedlist>
<listitem><para>
<emphasis>basename</emphasis> -
Basename from which allow and deny filenames will be created by
appending contents of <varname>allow_suffix</varname>
and <varname>deny_suffix</varname>
parameters.
</para></listitem>
<listitem><para>
<emphasis>URI</emphasis> - URI to be tested
</para></listitem>
<listitem><para>
<emphasis>Contact</emphasis> - Contact to be tested
</para></listitem>
</itemizedlist>
</section>
</section>
<section>
<title>RPC Commands</title>
<section id ="permissions.r.addressReload">
<title>
<function moreinfo="none">addressReload</function>
</title>
<para>
Causes the permissions module to re-read the contents of
address database table into cache
memory. In cache memory the entries are
for performance reasons stored in two
different tables: address table and
subnet table depending on the value of
the mask field (32 or smaller).
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.r.addressDump">
<title>
<function moreinfo="none">addressDump</function>
</title>
<para>
Causes the permissions module to dump
the contents of cache memory address table.
(Not the subnet table).
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.r.subnetDump">
<title>
<function moreinfo="none">subnetDump</function>
</title>
<para>
Causes permissions module to dump
contents of cache memory subnet table.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.r.domainDump">
<title>
<function moreinfo="none">domainDump</function>
</title>
<para>
Causes permissions module to dump
contents of cache memory domain table.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.r.testUri">
<title>
<function moreinfo="none">testUri basename uri contact</function>
</title>
<para>
Tests if the (URI, Contact) pair is allowed according to
allow/deny files. The files must already have been
loaded by &kamailio;.
</para>
<para>Parameters: </para>
<itemizedlist>
<listitem><para>
<emphasis>basename</emphasis> -
Basename from which allow and deny filenames will be created by
appending contents of the allow_suffix and deny_suffix
parameters.
</para></listitem>
<listitem><para>
<emphasis>URI</emphasis> - URI to be tested
</para></listitem>
<listitem><para>
<emphasis>Contact</emphasis> - Contact to be tested
</para></listitem>
</itemizedlist>
</section>
<section id ="permissions.r.trustedReload">
<title>
<function moreinfo="none">trustedReload</function>
</title>
<para>
Causes the permissions module to re-read the contents of
the trusted database table into cache memory.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
<section id ="permissions.r.trustedDump">
<title>
<function moreinfo="none">trustedDump</function>
</title>
<para>
Causes the permissions module to dump contents of the trusted
database table from cache memory.
</para>
<para>Parameters: <emphasis>none</emphasis></para>
</section>
</section> <!-- RPC commands -->
</chapter>