Configuring the RADIUS Listener Login Event Generator

Transcription

1 CHAPTER 19 Configuring the RADIUS Listener Login Event Generator Published: December 21, 2012 Introduction This chapter describes the configuration procedure for the RADIUS listener Login Event Generator (LEG). The RADIUS listener LEG is configured using the Cisco Service Control Subscriber Manager configuration file p3sm.cfg, which resides in the sm-inst-dir/sm/server/root/config directory (sm-inst-dir refers to the SM installation directory). The configuration file consists of sections headed by a bracketed section title; for example, [Radius.Subscriber ID]. Each section consists of several parameters having the format parameter=value. The number sign (#) at the beginning of a line signifies that it is a remark. The general RADIUS listener LEG configuration settings reside in the [Radius Listener] section. All additional RADIUS listener LEG sections start with the prefix Radius., such as [Radius.NAS.nas1], and they are defined initially as remark lines. Configuring the General Settings, page 19-2 Information About the Regular Expression Utility, page 19-6 Configuring RADIUS Attributes Mapping, page Configuring the NAS Devices, page Configuring the NAS Devices, page Applying the Configuration on the Cisco Service Control Subscriber Manager, page

2 Configuring the General Settings Chapter 19 Configuring the RADIUS Listener Login Event Generator Configuring the General Settings [Radius Listener] Section The [Radius Listener] section in the SM configuration file contains the following parameters: start Defines whether the SM should run the RADIUS listener at startup. Possible values for this parameter are yes and no. The default value is no. accounting_port Defines the RADIUS listener accounting port number. The default value is ip The IP address to which the RADIUS listener should bind. Use this parameter only in cases in which the IP address used for RADIUS transactions is not the main IP address of the SM machine; for example, in an SM cluster. Possible values are any IP address in dotted notation. The default value is not set. packet_types Defines the RADIUS protocol packet types to analyze. Possible values are accounting-start, accounting-interim, accounting-stop separated by a comma. The default value is accounting-start, accounting-interim, accounting-stop. interim_aging_timeout Updates the lease time for each IP address received from RADIUS packets. After each autologout time interval, the SM checks for subscriber IP addresses with an expired lease time. These subscriber IP addresses are removed from the system and database. The autologout mechanism must be active to enable the interim_aging_timeout feature. The default value is 0 hours. To activate the interim_aging_timeout feature, set a value greater than 0. The log_auto_logouts parameter in the [Auto Logout] section defines whether to issue user log messages for each removed mapping. Possible values are true or false. The default value is false. RADIUS Listener Section Configuration Example The following is a portion of a configuration example illustrating the [Radius Listener] section: [Radius Listener] # The following parameter defines whether the SM should run the Radius Listener at # startup. # Receives the values: yes, no. (default no) start=no # accounting port number (default 1813) accounting_port=1813 # RADIUS protocol packet types to analyze 19-2

3 Chapter 19 Configuring the RADIUS Listener Login Event Generator [Radius.Subscriber Attributes] Section packet_types=accounting-start,accounting-interim,accounting-stop # Interim Aging Timeout #interim_aging_timeout=0 [Radius.Subscriber Attributes] Section The Subscriber Manager RADIUS Listener LEG can extract more RADIUS attributes from the RDRs. Users define the additional attributes to be extracted and these configurations are sent to Cisco SCE. To define the additional attributes, configure the [Radius.Subscriber Attributes] section with the following parameters: attributes_list This parameter defines the additional RADIUS attribute or attributes to extract and process. Multiple attribute names are separated by commas when listed in this parameter. All the attributes defined in attribute_list needs to have [Radius.Field.field name] section. enable_extended_vsa_support This parameter enables this feature when the value is defined as true. The default value for this parameter is false. Only 20 extended attributes can be configured in Cisco SCE. Therefore, we recommend that you configure the same attributes in the RADIUS Listener section of the Subscriber Manager that are configured in Cisco SCE. Regular expressions are not applicable for subscriber attributes. radius_attribute_type For IPv4 subscribers, the VSA field type can be integer, string, ip_address, or binary. RADIUS Subscriber Attributes Section Configuration Example The following is a configuration example defining a list of additional RADIUS attributes: [Radius.Subscriber Attributes] attributes_list=acct-session-id,acct-session-time,called-station-id,wimax-active-time,wima x-bsid,3gpp-charging-characteristics,3gpp-charging-gateway-address,3gpp-charging-id,3gpp-g GSN-Address-Code-7,3GPP-GGSN-Address,3GPP-GGSN-MCC-MNC,3GPP-GPRS-Negotiated-QoS-Profile,3G PP-IMEISV,3GPP-IMSI,3GPP-MS-Timezone,3GPP-NSAPI,3GPP-PDP-Type,3GPP-RAT-Type,3GPP-Selection -Mode,3GPP-SGSN-Address,3GPP-SGSN-MCC-MNC,3GPP-User-Location-Info enable_extended_vsa_support=true [Radius.Field.WiMax-Active-Time] radius_attribute=26(24757;39) radius_attribute_type=integer [Radius.Field.WiMax-BSID] radius_attribute=26(24757;46) 19-3

4 RADIUS Subscriber Attributes Section Configuration Example Chapter 19 Configuring the RADIUS Listener Login Event Generator [Radius.Field.3GPP-Charging-Characteristics] radius_attribute=26(10415;13) [Radius.Field.3GPP-Charging-Gateway-Address] radius_attribute=26(10415;4) radius_attribute_type=ip_address [Radius.Field.3GPP-Charging-ID] radius_attribute=26(10415;2) radius_attribute_type=integer [Radius.Field.3GPP-GGSN-Address-Code-7] radius_attribute=26(10415;7) radius_attribute_type=ip_address [Radius.Field.3GPP-GGSN-Address] radius_attribute=26(10415;16) radius_attribute_type=ip_address [Radius.Field.3GPP-GGSN-MCC-MNC] radius_attribute=26(10415;9) [Radius.Field.3GPP-GPRS-Negotiated-QoS-Profile] radius_attribute=26(10415;5) radius_attribute_type=integer [Radius.Field.3GPP-IMEISV] radius_attribute=26(10415;20) [Radius.Field.3GPP-IMSI] radius_attribute=26(10415;1) [Radius.Field.3GPP-MS-Timezone] radius_attribute=26(10415;23) [Radius.Field.3GPP-NSAPI] radius_attribute=26(10415;10) [Radius.Field.3GPP-PDP-Type] radius_attribute=26(10415;3) radius_attribute_type=integer [Radius.Field.3GPP-RAT-Type] radius_attribute=26(10415;21) [Radius.Field.3GPP-Selection-Mode] radius_attribute=26(10415;12) [Radius.Field.Called-Station-ID] radius_attribute=30 [Radius.Field.3GPP-SGSN-Address] radius_attribute=26(10415;15) radius_attribute_type=ip_address 19-4

5 Chapter 19 Configuring the RADIUS Listener Login Event Generator RADIUS Subscriber Attributes Section Configuration Example [Radius.Field.3GPP-SGSN-MCC-MNC] radius_attribute=26(10415;18) [Radius.Field.3GPP-User-Location-Info] radius_attribute=26(10415;22) [Radius.Field.Acct-Session-ID] radius_attribute=44 [Radius.Field.Acct-Session-Time] radius_attribute=46 radius_attribute_type=integer The command-line utility p3radius -show would result in the following output: Attributes: Cell-ID,attribute:26(10,68),string SGSG-IP,attribute:26(10,65),string RAI,attribute:26(10,66),string 19-5

6 Information About the Regular Expression Utility Chapter 19 Configuring the RADIUS Listener Login Event Generator Information About the Regular Expression Utility A regular expression consists of a character string in which some characters are given special meaning with regard to pattern matching. Regular expressions have been in use from the early days of computing and provide a powerful and efficient way to parse, interpret, and search and replace text within an application. Supported Syntax, page 19-6 Unsupported Syntax, page 19-8 Regular Expression Examples, page 19-8 Regular Expression Processing versus RADIUS Listener Login Rate, page 19-9 Supported Syntax Within a regular expression, the following characters have special meaning: Positional Operators ^ matches at the beginning of a line. $ matches at the end of a line. \A matches the start of the entire string. \Z matches the end of the entire string. \b matches at a word break (Perl5 syntax only). \B matches at a non-word break (opposite of \b) (Perl5 syntax only). \<matches at the start of a word (egrep syntax only). \>matches at the end of a word (egrep syntax only). One-Character Operators. matches any single character. \d matches any decimal digit. \D matches any non-digit. \n matches a newline character. \r matches a return character. \s matches any whitespace character. \S matches any non-whitespace character. \t matches a horizontal tab character. \w matches any word (alphanumeric) character. \W matches any non-word (alphanumeric) character. \x matches the character x, if x is not one of the above listed escape sequences. 19-6

7 Chapter 19 Configuring the RADIUS Listener Login Event Generator Supported Syntax Character Class Operator [abc] matches any character in the set a, b, or c [^abc] matches any character not in the set a, b, or c [a-z] matches any character in the range a to z, inclusive A leading or trailing dash is interpreted literally. Within a character class expression, the following sequences have special meaning if the syntax bit RE_CHAR_CLASSES is on: [:alnum:] Any alphanumeric character. [:alpha:] Any alphabetical character. [:blank:] A space or horizontal tab. [:cntrl:] A control character. [:digit:] A decimal digit. [:graph:] A non-space, non-control character. [:lower:] A lowercase letter. [:print:] Same as graph, but also space and tab. [:punct:] A punctuation character. [:space:] Any whitespace character, including newline and return. [:upper:] An uppercase letter. [:xdigit:] A valid hexadecimal digit. Subexpressions and Backreferences (abc) matches whatever the expression abc would match, and saves it as a subexpression. Also used for grouping. (?:...) pure grouping operator, does not save contents. (?#...) embedded comment, ignored by engine. \n where 0 < n <10, matches the same thing the nth subexpression matched. Branching (Alternation) Operator a b matches whatever the expression a would match, or whatever the expression b would match. Repeating Operators These symbols operate on the previous atomic expression.? matches the preceding expression or the null string * matches the null string or any number of repetitions of the preceding expression. + matches one or more repetitions of the preceding expression. {m} matches exactly m repetitions of the one-character expression. {m,n} matches between m and n repetitions of the preceding expression, inclusive. {m,} matches m or more repetitions of the preceding expression. Stingy (Minimal) Matching If a repeating operator is immediately followed by a?, the repeating operator stops at the smallest number of repetitions that can complete the rest of the match. 19-7

8 Unsupported Syntax Chapter 19 Configuring the RADIUS Listener Login Event Generator Lookahead Lookahead refers to the ability to match part of an expression without consuming any of the input text. There are two variations to this: (?=foo) matches at any position where foo would match, but does not consume any characters of the input. (?!foo) matches at any position where foo would not match, but does not consume any characters of the input. Unsupported Syntax Some flavors of regular expression utilities support additional escape sequences, and this is not meant to be an exhaustive list of unsupported syntax. (?mods) inline compilation/execution modifiers (Perl5). \G end of previous match (Perl5). [.symbol.] collating symbol in class expression (POSIX). [=class=] equivalence class in class expression (POSIX). s/foo/bar/ style expressions as in sed and awk (note: these can be accomplished through other means in the API). Regular Expression Examples The following examples show how to perform some basic manipulation using the regular expression tool. To remove the cisco.com suffix from a given name (e.g. name@cisco.com), define the following manipulation rule: (.*)@.* To remove the name prefix from a given name (e.g. name@cisco.com), define the following manipulation rule:.*@(.*) If no reduction is needed, either define the following reduction rule (.*), or do not define any rule. To find a partial match from of a name (e.g. find 'isco' in name@cisco.com), define the following matching rule: mapping_table.cisco=<value> To find a full match of a name, define the following matching rule: mapping_table.cisco=<value> To define a default value for an empty or non-existent attribute value: mapping_table.^$=<value> If the character or string was not found in the input string when performing reduction (stripping characters or strings), the result of the regular expression is an empty string. In previous versions, if the character or string was not found in the input string when performing reduction, the result of the regular expression was the input string. Brackets '[' or ']' are used by the regular expression mechanism and also in the section definitions in the configuration files. If either of these characters form a part of the reduction rule definition (field_manipulation parameter) or in matching rule definition (mapping_table parameter), it should be preceded by two backslashes ('\\') for it to be used as part of the value. 19-8

9 Chapter 19 Configuring the RADIUS Listener Login Event Generator Regular Expression Processing versus RADIUS Listener Login Rate Example: [Sample Section] mapping_table.^12\\[user7$=7 will have a full match result to the '12\[user7' string mapping_table.^12\[user7$=7 will have a full match result to the '12[user7' string mapping_table.^12[user7$=7 will have a full match result to the '12[user7' string as well. Parentheses '(' or ')' and the pipe character ' ' should be preceded by a single backslash '\'. For example, if you have the rule ^(?:88 99)(.*)$ --input=886, the CLU command should be as shown in the following example: p3radius --test-reduction-rule --reg-exp=^\(?:88\ 99\)\(.*\)$ --input=886 Regular Expression Processing versus RADIUS Listener Login Rate Using regular expressions for string reduction, pattern matching, or both can cause performance degradation on the RADIUS listener login rate. When using regular expressions, it is important to define the correct reduction and match patterns. There are three elements that affect the regular expression processing time. Complexity of the pattern. Length of the input string to reduce or match; a longer string will cause longer regular expression operation. Total number of reduction and matching rules defined in the configuration file. The following examples demonstrate regular expression operations that do not significantly impact performance: Removal of prefixes or suffixes Use a regular expression of the format.*<string>(.*) or (.*)<String>.*. Matching prefixes or suffixes Use a regular expression of the format ^<String>or <String>$. To calculate the impact of the regular expression usage on the login rate, the p3radius test-reduction-rule and test-manipulation-rule CLU commands provide the average processing time for a single reduction/matching operation. Using complex regular expression patterns will cause performance degradation; the degradation increases relative to the length of the string being manipulated. It is strongly recommended not to use the [] operands with the.* or with the (.*) operands. More number of regular expressions can impact the the processing. Order the regular expressions in such a way that all matches are at the top. 19-9

10 Configuring RADIUS Attributes Mapping Chapter 19 Configuring the RADIUS Listener Login Event Generator Configuring RADIUS Attributes Mapping Mapping a RADIUS Attribute to a Subscriber ID, page Mapping RADIUS Attribute to Subscriber Policy, page Mapping of RADIUS Attribute to Subscriber IP Address, page Mapping a RADIUS Attribute to a Subscriber ID The configuration described in this section is optional. The subscriber ID is usually put in the User-Name RADIUS attribute. However, in certain installations, it is possible to use a different RADIUS attribute. For example, in wireless environments, it is possible to use the 3GPP-IMSI or the 3GPP2-IMSI attributes. The default is to use the User-Name attribute. The RADIUS listener can be configured to concatenate up to five RADIUS attributes for use as the Subscriber ID. To define which attribute(s) to use for the subscriber ID, configure the [Radius.Subscriber ID] and the [Radius.Field.<field name>] sections. To define the attribute(s) to use, configure the following parameters in the [Radius.Subscriber ID] section: fields Defines the RADIUS protocol fields names. When defining multiple fields, use commas between the field names. The field name must not start or end with a space character and it cannot contain an '=' character. A maximum of three fields can be defined. The default value is user_name. The following is an example of setting this parameter: fields=user_name,vpn field_separator Defines the character or string to be used when concatenating several fields. If you define three values for the fields parameter (user_name, vpn, and IP) and the field separator is being defined: The field_separator parameter must contain user_name, vpn, and IP in the same order as they were defined in the fields parameter. The separator character between the 1st and 2nd attributes and between the 2nd and 3rd attributes can be different; for example, user_name-vpn::ip. The separator can be string; for example, ::. The separator can be an empty string; for example, field_separator=user_namevpnip. The default value is _. The following is an example of setting this parameter with the value '-': field_separator=user_name-vpn 19-10

11 Chapter 19 Configuring the RADIUS Listener Login Event Generator Mapping a RADIUS Attribute to a Subscriber ID field_manipulation.<field name>=<regular expression> The field_manipulation parameters define how to manipulate the RADIUS field values. The <field name> part of this parameter is one of the fields defined in the fields parameter. The <regular expression> part of this parameter is the regular expression reduction to be used on the <field name> value. It is possible to define a field_manipulation rule for each name in the field property. The following is an example of setting this parameter: field_manipulation.user_name=(.*)@.* field_manipulation.vpn=(.*) It is possible to configure the RADIUS listener to strip a RADIUS attribute based on a selected character or string using a regular expression rule. This provides a convenient method for obtaining the subscriber ID from a prefix or a suffix of an attribute value. For example, you can obtain the subscriber ID from the USERNAME attribute value of subscriber@domain-name by stripping the characters from the value by using the (.*)@.* regular expression rule to produce the subscriber. Similarly, you can obtain the domain name by using the.*@(.*) regular expression rule. concatenated_string_manipulation=<regular expression> The concatenated_string_manipulation parameters define how to manipulate the concatenated RADIUS field value. The LEG running a regular expression manipulation after concatenating the attribute values together. The regular expression is designed to identify the existence of each set of attributes and separators and to extract the relevant part of the concatenated string. Example: [Radius.Subscriber ID] fields=field_a,field_b field_separator=field_a:field_b field_manipulation.field_a=reg_exp_1 field_manipulation.field_b=reg_exp_2 concatenated_string_manipulation =REG_EXP_3 The Radius listener performs the following steps: 1. Retrieves the parameters represented by field_a and field_b. 2. Performs manipulation on the field data as follows: a. Performs REG_EXP_1 manipulation on field_a data. b. Performs REG_EXP_2 manipulation on field_b data. 3. Concatenates 2a and 2b result using the ":". 4. Performs REG_EXP_3 manipulation on the Step 3 result. For each field defined by the fields parameter, you must also define a [Radius.Field.<field name>] section with the following parameters: radius_attribute Configure the radius_attribute parameter with the RADIUS attribute number. Use the following format for Vendor-Specific Attributes (VSA): 26(vendor-id;sub-attribute). For example, 26(10415;1). The default value is

12 Mapping a RADIUS Attribute to a Subscriber ID Chapter 19 Configuring the RADIUS Listener Login Event Generator radius_attribute_type Configure radius_attribute_type parameter according to the RADIUS attribute format. Possible values for this parameter are integer, string, and IP_address. The default value is string. The IP_address type is actually similar to integer type, but after retrieving the data from the radius data, the LEG translates it to String value (A.B.C.D). [Radius.Field.example] # RADIUS protocol attribute number. radius_attribute = 4 # the type of the attribute (type "integer" or "string") radius_attribute_type = IP_address Validation Rules When regular expression rules are used for reduction of RADIUS attributes, the following validation rules are applied: The protocol field amount must not exceed three fields. Each field defined in the fields parameter must have a corresponding [Radius.Field.<field>] section. If the separator character is defined, the order of the fields is checked. Each field defined in the fields parameter may have a single reduction regular expression rule. If a rule exists, the regular expression validity check is performed. If an VPN value is available, then the user name is the VPN, otherwise the user name is the user without the domain. Configuring the Subscriber ID: Example concatenated_string_manipulation=.*-(.*) (.*)@.* The following is an example configuration file illustrating how to configure the subscriber ID assignment option. In this example, the User-Name and VPN attributes are assigned to the subscriber ID: [Radius.Subscriber ID] # Field name fields=user_name,vpn # Field separator # "-" is the separator between the user_name and vpn fields. field_separator=user_name-vpn [Radius.Field.user_name] # RADIUS protocol attribute number radius_attribute=1 # the type of the attribute (type "integer" or "string") radius_attribute_type = string [Radius.Field.vpn] # RADIUS protocol attribute number. radius_attribute = 5 # the type of the attribute (type "integer" or "string") radius_attribute_type = integer 19-12

13 Chapter 19 Configuring the RADIUS Listener Login Event Generator Mapping RADIUS Attribute to Subscriber Policy Configuring the Vendor-Specific Attribute as Subscriber ID: Example The following is an example configuration file illustrating how to configure the subscriber ID assignment option. In this example, the 3GPP_IMSI vendor-specific attribute is assigned to the subscriber ID: [Radius.Subscriber ID] # Field name fields=user_name [Radius.Field.user_name] # in case of a vendor specific attribute (VSA) # when the 'radius_attribute' is set to 26 # configuration for 3GPP_IMSI radius_attribute = 26(10415;1) # the type of the attribute (type "integer" or "string") radius_attribute_type = string Configuring Stripping of the Attribute Value Example Using the Regular Expression Rule The following is an example configuration file illustrating how to configure the stripping of an attribute value using a regular expression rule: [Radius.Subscriber ID] # Field name fields=user_name # Field manipulation field_manipulation.user_name=(.*)@.* [Radius.Field.user_name] # RADIUS protocol attribute number radius_attribute=1 # the type of the attribute (type "integer" or "string") radius_attribute_type = string The above configuration applied on john@some-domain.com will extract john as a Subscriber ID. Mapping RADIUS Attribute to Subscriber Policy The configuration described in this section is optional. Subscriber policy configuration in the RADIUS listener can be handled in any of the following ways: Extract the data from a RADIUS attribute. Set a default value for all subscribers that log on via the RADIUS listener. Do not set any policy to the subscriber

14 Mapping RADIUS Attribute to Subscriber Policy Chapter 19 Configuring the RADIUS Listener Login Event Generator Extracting Data from a RADIUS Attribute To define which RADIUS attribute to use for the subscriber policy, configure the [Radius.Property.Package] and [Radius.Field.<field name>] sections. To define the attribute to be used, configure the following parameters: fields Defines the RADIUS protocol fields names. When defining multiple fields, use commas between the field names. The field name must not start or end with a space character and it cannot contain an '=' character. This parameter has no default value. The following is an example of setting this parameter: fields=user_name,ip field_separator Defines the character to be used when concatenating several fields. The default value is underscore (_). The following is an example of setting this parameter with the value hyphen (-): field_separator=user_name-ip skip_policy_update_on_interim If the property of a subscriber is not to be updated during the interim packets, then the skip_policy_update_on_interim parameter should be set to true. The default value is false. field_manipulation.<field name>=<regular expression> The field_manipulation parameters define how to manipulate the RADIUS field values. The <field name> part of this parameter is one of the fields defined in the fields parameter. The <regular expression> part of this parameter is the reduction regular expression to be used on the <field name> value. It is possible to define a field_manipulation rule for each name in the field property. This is the default rule if there is a non-configured field manipulation. The following is an example of setting this parameter: field_manipulation.user_name=(.*)@.* field_manipulation.ip=(.*) mapping_table.<regexp>=<property-value> The mapping_table parameters define a conversion table between the result of the attribute value manipulation, the matching rule, and the property value. The <regexp> part of this parameter defines the regular expression matching rule. The <property-value> part of this parameter defines the integer result if the regular expression is matched. There is no default value for this parameter, but it is possible to set a default value by using the following expression: mapping_table.^$=<value>. This value is used if the mapping result is an empty string. The following is an example of setting this parameter. mapping_table..*@.*=1 mapping_table..*=

15 Chapter 19 Configuring the RADIUS Listener Login Event Generator Mapping RADIUS Attribute to Subscriber Policy For each field defined by the fields parameter, you must also define a [Radius.Field.<field name>] section with the following parameters: radius_attribute Configure the radius_attribute parameter with the RADIUS attribute number. Use the following format for Vendor-Specific Attributes (VSA): 26(vendor-id;sub-attribute). For example, 26(10415;1). The default value is 1. radius_attribute_type Configure the radius_attribute_type parameter according to the RADIUS attribute format. Possible values for this parameter are integer and string. The default value is string. use_default Defines whether to use a default policy, if no match is found in the mapping table. Possible values for this parameter are true and false. The default value is false. default_policy Defines the default policy ID to use if no policy information is extracted. This parameter is relevant only if the use_default parameter is set to true. Possible values for this parameter are any integer number. This parameter has no default value. ignore_policy_list Defines a list of policy IDs separated by commas. During login, if the policy ID matches one of the values defined in this parameter, a login operation occurs without changing the policy value. This parameter is valid only if the allow_login_with_no_policy parameter is set to true. This parameter has no default value. allow_login_with_no_policy Defines whether a login can be performed when no policy is found for assignment. Possible values for this parameter are true and false. The default value is false. Validation Rules When regular expression rules are used for reduction of RADIUS attributes, the following validation rules are applied: The protocol field amount must not exceed three fields. Each field defined in the fields parameter must have a corresponding [Radius.Field.<field>] section. The property value in the mapping table is an integer. The = operator is concatenated to the property value with no space between them. A validity test is performed for each regular expression that is used for matching and reduction

16 Mapping of RADIUS Attribute to Subscriber IP Address Chapter 19 Configuring the RADIUS Listener Login Event Generator Extracting Data from a RADIUS Attribute: Example The following example is a portion of a configuration file illustrating how to configure the subscriber policy assignment option. In this example, a VSA is assigned to the subscriber policy. It is stripped from its prefix and converted to integer type using a mapping table. [Radius.Property.Package] # Field name fields=user_name,vpn # Field separator field_separator=user_name@vpn # Field manipulation field_manipulation.user_name=(.*)@.* # Mapping table mapping_table..*@.*=1 mapping_table.^$=2 mapping_table..*=3 [Radius.Field.user_name] # RADIUS protocol attribute number radius_attribute = 1 # the type of the attribute (type "integer" or "string") radius_attribute type = string [Radius.Field.vpn] # RADIUS protocol attribute number. # use the following format for VSAs: 26 vendor-id;sub-attribute) # for example: 26(9;1) radius_attribute = 26(9;1) # the type of the attribute (type "integer" or "string") radius_attribute_type = string Not Setting Any Policy to the Subscriber Edit the [Radius.Property.Package] section with all remark lines. The number sign ( # ) at the beginning of a line signifies a remark line. Mapping of RADIUS Attribute to Subscriber IP Address The subscriber IP address is normally based on the Framed-IP-Address attribute; however, it can also be based on a different RADIUS attribute. The default is to use the Framed-IP-Address attribute. In addition, for environments with IP addresses over VPN, the RADIUS listener LEG supports the extraction of VPN information from a RADIUS attribute to be used with the extracted IP address. Currently the LEG supports subscriber mappings over VPN only for VPNs that are defined by a VLAN-ID (also referred to as VPNs of type VLAN ). The following algorithm is applied to handle IP addresses in this LEG: 1. If the user configured an attribute from which to extract the IP, the LEG looks for that attribute in the packet. If the attribute exists, the LEG uses the attribute as the subscriber IP address. 2. If the attribute does not exist or is not configured, the LEG looks for the Framed-Route attributes; several Framed-Route attributes may exist. If any Framed-Route attributes exist, the LEG uses these attributes as the subscriber IP addresses

17 Chapter 19 Configuring the RADIUS Listener Login Event Generator Mapping of RADIUS Attribute to Subscriber IP Address 3. If there are no Framed-Route attributes, the LEG looks for a Framed-IP-Address attribute and a Framed-IP-Netmask attribute. If a Framed-IP-Address attribute exists, the LEG uses this attribute as the subscriber IP address. If both the Framed-IP-Address and the Framed-IP-Netmask attributes exist, the operation is performed with the IP range represented by the IP address and the IP netmask. 4. Otherwise, the LEG performs a login without the IP address. The configured attribute can be a regular RADIUS attribute or a VSA. It is possible to encode the attribute as an integer, in which case it will be a single IP address. It can also be encoded as a string and will therefore be an IP-Address/IP-Range value, which must be formatted as A.B.C.D/E or A.B.C.D. The supported format of the Framed-Route attribute is as described in RFC2865. It must start with a string that starts with the route itself in the format A.B.C.D/E followed by a space. Other values follow the space, but the LEG ignores these other values. To define which attribute to use for the subscriber IP address, configure the [Radius.Subscriber IP Address] and the [Radius.Field.<field name>] sections. To define the attribute to use, configure the following parameters: fields Defines the RADIUS protocol field name. Only one field name can be defined. The default value is not set. vpn_field Defines the RADIUS protocol attribute field name to be used as the VPN information related to the IP address. The default value is not set. For the field defined by the fields parameter, you must also define a [Radius.Field.<field name>] section with the following parameters: radius_attribute Configure the radius_attribute parameter with the RADIUS attribute number. Use the following format for Vendor-Specific Attributes (VSA): 26(vendor-id;sub-attribute). For example, 26(10415;1). The default value is 1. radius_attribute_type Configure radius_attribute_type parameter according to the RADIUS attribute format. Possible values for this parameter are integer and string. The default value is string. Configuring Subscriber IP Address: Example The following is an example configuration file illustrating how to configure the subscriber IP assignment option. In the following example, the Framed-IP-Address attribute is used. [Radius.Subscriber IP Address] # Field name for IP fields=frame-ip-address [Radius.Field.frame-ip-address] # RADIUS protocol attribute number 19-17

18 Mapping of RADIUS Attribute to Subscriber IP Address Chapter 19 Configuring the RADIUS Listener Login Event Generator radius_attribute=8 # the type of the attribute (type "integer" or "string") # if type is string a mapping table must be supplied # below. # (no default) radius_attribute_type=integer Configuring Subscriber IP Address over VPN: Example The following is an example configuration file illustrating how to configure the subscriber IP assignment option for IP over VPN. In the following example, the Framed-IP-Address attribute is used for the IP address and the cisco-av-pair VSA attribute is used for the VPN information. [Radius.Subscriber IP Address] # RADIUS protocol field name. fields=ip # RADIUS protocol attribute field name to be used as the # VPN information related to the IP address. vpn_field=vpn [Radius.Field.ip] # RADIUS protocol attribute number radius_attribute = 8 # the type of the attribute (type "integer" or "string") radius_attribute type = integer [Radius.Field.vpn] # RADIUS protocol attribute number. # use the following format for VSAs: 26 vendor-id;sub-attribute) # for example: 26(9;1) radius_attribute = 26(9;1) # the type of the attribute (type "integer" or "string") radius_attribute_type = integer 19-18

19 Chapter 19 Configuring the RADIUS Listener Login Event Generator Configuring the NAS Devices Configuring the NAS Devices The RADIUS listener LEG must be configured with the RADIUS clients/nas devices that transmit RADIUS messages to the LEG, to accept RADIUS messages. Each [Radius.NAS.XXX] section specifies a single Network Access System (NAS), where XXX represents the NAS name. Step 1 Step 2 Step 3 Copy the example Radius.NAS.XXX section that exists in the configuration file. The remarks from the parameters and section header should be removed. Configure a section name of the format [Radius.NAS.my_name_for_the_NAS]. Configure the domain, IP_address, NAS_identifier, and secret parameters: domain Set the domain parameter with a valid subscriber domain name. IP_address Set the IP_address parameter with the NAS IP address with which the RADIUS messages arrive. IP address should be in dotted notation (xxx.xxx.xxx.xxx). NAS_identifier Set the NAS_identifier parameter with a NAS-ID attribute with which the RADIUS messages are sent. secret Set the secret parameter with the secret key defined in the NAS for this connection. Configuring the NAS Devices: Example This example is a section of a configuration file illustrating how to configure the NAS: [Radius.NAS.Access134] # Cisco subscriber domain name domain = subscribers # IP address in dotted notation IP_address = # name of the NAS that exists in the NAS-ID attribute NAS_identifier =ACCESS134 # secret string secret = secret123 Applying the Configuration on the Cisco Service Control Subscriber Manager After editing the relevant configuration files, use the following p3sm command-line utility to load the configuration file: >p3sm --load-config 19-19

20 Applying the Configuration on the Cisco Service Control Subscriber Manager Chapter 19 Configuring the RADIUS Listener Login Event Generator 19-20