14. Attribute List

The following sections describe the most frequently used Radius attributes. Each attribute is described as follows:

ATTRIBUTE name value type

	Users:	user-flags
	Hints:	hints-flags
	Huntgroups:	huntgroup-flags
	Additivity:	additivity
	Proxy propagated:	prop

These values have the following meaning:

name

The attribute name.

value

The attribute number.

type

The attribute type.

user-flags

Syntax flags defining in which part of a `raddb/users' entry this attribute may be used. The flags consist of two letters: `L' means the attribute can be used in the LHS, `R' means it can be used in the RHS.

hints-flags

Syntax flags defining in which part of a `raddb/hints' entry this attribute may be used.

huntgroup-flags

Syntax flags defining in which part of a `raddb/huntgroups' entry this attribute may be used.

additivity

The additivity of the attribute determines what happens if a rule attempts to add to the pair list an attribute that is already present in this list. Depending on its value, the actions of the server are:

Append

New attribute is appended to the end of the list.

Replace

New attribute replaces the old.

Drop

New attribute is dropped. The old one remains in the list.

prop

Is the attribute propagated back to the NAS if the server works in proxy mode?

The entry N/A for any of this fields signifies "not applicable".

14.1 Authentication Attributes
14.2 Accounting Attributes
14.3 Radius Internal Attributes

14.1 Authentication Attributes

These are the attributes the NAS uses in authentication packets and expects to get back in authentication replies. These can be used in matching rules.

14.1.1 CHAP-Password
14.1.2 Callback-Id
14.1.3 Callback-Number
14.1.4 Called-Station-Id
14.1.5 Calling-Station-Id
14.1.6 Class
14.1.7 Framed-Compression
14.1.8 Framed-IP-Address
14.1.9 Framed-IP-Netmask
14.1.10 Framed-MTU
14.1.11 Framed-Protocol
14.1.12 Framed-Route
14.1.13 Framed-Routing
14.1.14 Idle-Timeout
14.1.15 NAS-IP-Address
14.1.16 NAS-Identifier
14.1.17 NAS-Port-Id
14.1.18 NAS-Port-Type
14.1.19 Reply-Message
14.1.20 Service-Type
14.1.21 Session-Timeout
14.1.22 State
14.1.23 Termination-Action
14.1.24 User-Name
14.1.25 User-Password
14.1.26 Vendor-Specific

14.1.1 CHAP-Password

ATTRIBUTE CHAP-Password 3 string

	Users:	L-
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	No

This attribute indicates the response value provided by a PPP Challenge-Handshake Authentication Protocol (CHAP) user in response to the challenge. It is only used in Access-Request packets.

The CHAP challenge value is found in the CHAP-Challenge attribute (60) if present in the packet, otherwise in the request authenticator field.

14.1.2 Callback-Id

ATTRIBUTE Callback-Id 20 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	No

This attribute indicates the name of a place to be called, to be interpreted by the NAS. It may be used in Access-Accept packets.

14.1.3 Callback-Number

ATTRIBUTE Callback-Number 19 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	No

This attribute indicates a dialing string to be used for callback. It may be used in Access-Accept packets. It may be used in an Access-Request packet as a hint to the server that a Callback service is desired, but the server is not required to honor the hint.

14.1.4 Called-Station-Id

ATTRIBUTE Called-Station-Id 30 string

	Users:	L-
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute allows the NAS to send in the Access-Request packet the phone number that the user called, using Dialed Number Identification (DNIS) or similar technology. Note that this may be different from the phone number the call comes in on. It is only used in Access-Request packets.

14.1.5 Calling-Station-Id

ATTRIBUTE Calling-Station-Id 31 string

	Users:	L-
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute allows the NAS to send in the Access-Request packet the phone number that the call came from, using automatic number identification (ANI) or similar technology. It is only used in Access-Request packets.

14.1.6 Class

ATTRIBUTE Class 25 string

	Users:	LR
	Hints:	LR
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute is available to be sent by the server to the client in an Access-Accept and should be sent unmodified by the client to the accounting server as part of the Accounting-Request packet if accounting is supported.

14.1.7 Framed-Compression

ATTRIBUTE Framed-Compression 13 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	Yes

VALUE Framed-Compression None 0 VALUE Framed-Compression Van-Jacobson-TCP-IP 1

This attribute indicates a compression protocol to be used for the link. It may be used in Access-Accept packets. It may be used in an Access-Request packet as a hint to the server that the NAS would prefer to use that compression, but the server is not required to honor the hint.

More than one compression protocol attribute may be sent. It is the responsibility of the NAS to apply the proper compression protocol to appropriate link traffic.

14.1.8 Framed-IP-Address

ATTRIBUTE Framed-IP-Address 8 ipaddr

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	No

This attribute indicates the address to be configured for the user. It may be used in Access-Accept packets. It may be used in an Access-Request packet as a hint by the NAS to the server that it would prefer that address, but the server is not required to honor the hint.

The value 0xFFFFFFFF (255.255.255.255) indicates that the NAS should allow the user to select an address. The value 0xFFFFFFFE (255.255.255.254) indicates that the NAS should select an address for the user (e.g. assigned from a pool of addresses kept by the NAS). Other valid values indicate that the NAS should use that value as the user's IP.

When used in a RHS, the value of this attribute can optionally be followed by a plus sign. This usage means that the value of NAS-Port-Id must be added to this IP before replying. For example,

Framed-IP-Address = 10.10.0.1+

14.1.9 Framed-IP-Netmask

ATTRIBUTE Framed-IP-Netmask 9 ipaddr

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	No

This attribute indicates the IP netmask to be configured for the user when the user is a router to a network. It may be used in Access-Accept packets. It may be used in an Access-Request packet as a hint by the NAS to the server that it would prefer that netmask, but the server is not required to honor the hint.

14.1.10 Framed-MTU

ATTRIBUTE Framed-MTU 12 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Replace
	Proxy propagated:	Yes

This attribute indicates the maximum transmission unit to be configured for the user, when it is not negotiated by some other means (such as PPP). It is only used in Access-Accept packets.

14.1.11 Framed-Protocol

ATTRIBUTE Framed-Protocol 7 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	Yes

VALUE Framed-Protocol PPP 1 VALUE Framed-Protocol SLIP 2

This attribute indicates the framing to be used for framed access. It may be used in both Access-Request and Access-Accept packets.

14.1.12 Framed-Route

ATTRIBUTE Framed-Route 22 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	No

This attribute provides routing information to be configured for the user on the NAS. It is used in the Access-Accept packet and can appear multiple times.

14.1.13 Framed-Routing

ATTRIBUTE Framed-Routing 10 integer

	Users:	-R
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Replace
	Proxy propagated:	No

VALUE Framed-Routing None 0 VALUE Framed-Routing Broadcast 1 VALUE Framed-Routing Listen 2 VALUE Framed-Routing Broadcast-Listen 3

This attribute indicates the routing method for the user when the user is a router to a network. It is only used in Access-Accept packets.

14.1.14 Idle-Timeout

ATTRIBUTE Idle-Timeout 28 integer

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	Yes

This attribute sets the maximum number of consecutive seconds of idle connection allowed to the user before termination of the session or prompt. The server may send this attribute to the client in an Access-Accept or Access-Challenge.

14.1.15 NAS-IP-Address

ATTRIBUTE NAS-IP-Address 4 ipaddr

	Users:	L-
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute indicates the identifying IP of the NAS which is requesting authentication of the user. It is only used in Access-Request packets. Each Access-Request packet should contain either a NAS-IP-Address or a NAS-Identifier attribute (14.1.16 NAS-Identifier).

14.1.16 NAS-Identifier

ATTRIBUTE NAS-Identifier 32 string

	Users:	L-
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute contains a string identifying the NAS originating the access request. It is only used in Access-Request packets. Either NAS-IP-Address or NAS-Identifier should be present in an Access-Request packet.

See section 14.1.15 NAS-IP-Address.

14.1.17 NAS-Port-Id

ATTRIBUTE NAS-Port-Id 5 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute indicates the physical port number of the NAS that is authenticating the user. It is only used in Access-Request packets. Note that here we are using "port" in its sense of a physical connection on the NAS, not in the sense of a TCP or UDP port number.

Some NASes try to encode various information in the NAS-Port-Id attribute value. For example, the MAX Ascend terminal server constructs NAS-Port-Id by concatenating the line type (one digit), the line number (two digits), and the channel number (two digits), thus producing a five-digit port number. In order to normalize such encoded port numbers we recommend using a rewrite function (see section 5.12 Rewrite functions -- `raddb/rewrite'). A rewrite function for MAX Ascend servers is provided in the distribution.

14.1.18 NAS-Port-Type

ATTRIBUTE NAS-Port-Type 61 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	Append
	Proxy propagated:	No

VALUE NAS-Port-Type Async 0 VALUE NAS-Port-Type Sync 1 VALUE NAS-Port-Type ISDN 2 VALUE NAS-Port-Type ISDN-V120 3 VALUE NAS-Port-Type ISDN-V110 4

This attribute indicates the type of the physical port of the NAS that is authenticating the user. It can be used instead of or in addition to the NAS-Port-Id (14.1.17 NAS-Port-Id) attribute. It is only used in Access-Request packets. Either NAS-Port or NAS-Port-Type or both should be present in an Access-Request packet, if the NAS differentiates among its ports.

14.1.19 Reply-Message

ATTRIBUTE Reply-Message 18 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Append
	Proxy propagated:	Yes

This attribute indicates text that may be displayed to the user.

When used in an Access-Accept, it is the success message.

When used in an Access-Reject, it is the failure message. It may indicate a dialog message to prompt the user before another Access-Request attempt.

When used in an Access-Challenge, it may indicate a dialog message to prompt the user for a response.

Multiple Reply-Message attributes may be included, and if any are displayed, they must be displayed in the same order as they appear in in the packet.

14.1.20 Service-Type

ATTRIBUTE Service-Type 6 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	Yes

VALUE Service-Type Login-User 1 VALUE Service-Type Framed-User 2 VALUE Service-Type Callback-Login-User 3 VALUE Service-Type Callback-Framed-User 4 VALUE Service-Type Outbound-User 5 VALUE Service-Type Administrative-User 6 VALUE Service-Type NAS-Prompt-User 7 VALUE Service-Type Authenticate-Only 8 VALUE Service-Type Call-Check 10

This attribute indicates the type of service the user has requested, or the type of service to be provided. It may be used in both Access-Request and Access-Accept packets.

When used in an Access-Request the service type represents a hint to the Radius server that the NAS has reason to believe the user would prefer the kind of service indicated.

When used in an Access-Accept, the service type is an indication to the NAS that the user must be provided this type of service.

The meaning of various service types is as follows:

Login-User

The user should be connected to a host.

Framed-User

A framed protocol, such as PPP or SLIP, should be started for the user. The Framed-IP-Address attribute (see section 14.1.8 Framed-IP-Address) will supply the IP to be used.

Callback-Login-User

The user should be disconnected and called back, then connected to a host.

Callback-Framed-User

The user should be disconnected and called back; then a framed protocol, such as PPP or SLIP, should be started for the user.

Outbound-User

The user should be granted access to outgoing devices.

Administrative-User

The user should be granted access to the administrative interface to the NAS, from which privileged commands can be executed.

NAS-Prompt

The user should be provided a command prompt on the NAS, from which nonprivileged commands can be executed.

Authenticate-Only

Only authentication is requested, and no authorization information needs to be returned in the Access-Accept.

Call-Check

Callback-NAS-Prompt

The user should be disconnected and called back, then provided a command prompt on the NAS, from which nonprivileged commands can be executed.

14.1.21 Session-Timeout

ATTRIBUTE Session-Timeout 27 integer

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	Yes

This attribute sets the maximum number of seconds of service to be provided to the user before termination of the session or prompt. The server may send this attribute to the client in an Access-Accept or Access-Challenge.

14.1.22 State

ATTRIBUTE State 24 string

	Users:	LR
	Hints:	LR
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

This attribute is available to be sent by the server to the client in an Access-Challenge and must be sent unmodified from the client to the server in the new Access-Request reply to that challenge, if any.

This attribute is available to be sent by the server to the client in an Access-Accept that also includes a Termination-Action attribute with the value RADIUS-Request. If the NAS performs the termination action by sending a new Access-Request upon termination of the current session, it must include the State attribute unchanged in that Access-Request.

In either usage, no interpretation by the client should be made. A packet may have only one State attribute.

14.1.23 Termination-Action

ATTRIBUTE Termination-Action 29 integer

	Users:	LR
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Replace
	Proxy propagated:	No

VALUE Termination-Action Default 0 VALUE Termination-Action RADIUS-Request 1

This attribute indicates what action the NAS should take when the specified service is completed. It is only used in Access-Accept packets.

14.1.24 User-Name

ATTRIBUTE User-Name 1 string

	Users:	LR
	Hints:	-R
	Huntgroups:	LR
	Additivity:	Replace
	Proxy propagated:	Yes

This attribute indicates the name of the user to be authenticated or accounted. It is used in Access-Request and Accounting attributes. The length of the user name is usually limited by some arbitrary value. By default, Radius supports user names up to 32 characters long. This value can be modified by redefining the RUT_USERNAME macro in the `include/radutmp.h' file in the distribution directory and recompiling the program.

Some NASes have peculiarities about sending long user names. For example, the Specialix Jetstream 8500 24-port access server inserts a `/' character after the 10th character if the user name is longer than 10 characters. In such cases, we recommend applying rewrite functions in order to bring the user name to its normal form (see section 5.12 Rewrite functions -- `raddb/rewrite').

14.1.25 User-Password

ATTRIBUTE User-Password 2 string

	Users:	L-
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	No

This attribute indicates the password of the user to be authenticated, or the user's input following an Access-Challenge. It is only used in Access-Request packets.

On transmission, the password is hidden. The password is first padded at the end with nulls to a multiple of 16 octets. A one-way MD5 hash is calculated over a stream of octets consisting of the shared secret followed by the request authenticator. This value is XORed with the first 16 octet segment of the password and placed in the first 16 octets of the String field of the User-Password attribute.

If the password is longer than 16 characters, a second one-way MD5 hash is calculated over a stream of octets consisting of the shared secret followed by the result of the first xor. That hash is XORed with the second 16 octet segment of the password and placed in the second 16 octets of the string field of the User-Password attribute.

If necessary, this operation is repeated, with each XOR result being used along with the shared secret to generate the next hash to XOR the next segment of the password, up to no more than 128 characters.

14.1.26 Vendor-Specific

(This message will disappear, once this node revised.)

ATTRIBUTE Vendor-Specific 26 string

	Users:	LR
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Append
	Proxy propagated:	No

This attribute is available to allow vendors to support their own extended attributes not suitable for general usage. <FIXME> some more detail over the VSAs? How does GNU Radius handle unknown VSAs? </>

14.2 Accounting Attributes

These are attributes the NAS sends along with accounting requests. These attributes can not be used in matching rules.

14.2.1 Acct-Authentic
14.2.2 Acct-Delay-Time
14.2.3 Acct-Input-Octets
14.2.4 Acct-Input-Packets
14.2.5 Acct-Output-Octets
14.2.6 Acct-Output-Packets
14.2.7 Acct-Session-Id
14.2.8 Acct-Session-Time
14.2.9 Acct-Status-Type
14.2.10 Acct-Terminate-Cause

14.2.1 Acct-Authentic

ATTRIBUTE Acct-Authentic 45 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

VALUE Acct-Authentic RADIUS 1 VALUE Acct-Authentic Local 2 VALUE Acct-Authentic Remote 3

This attribute may be included in an Accounting-Request to indicate how the user was authenticated, whether by Radius, the NAS itself, or another remote authentication protocol. Users who are delivered service without being authenticated should not generate accounting records.

14.2.2 Acct-Delay-Time

ATTRIBUTE Acct-Delay-Time 41 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many seconds the client has been trying to send this record for, and can be subtracted from the time of arrival on the server to find the approximate time of the event generating this Accounting-Request. (Network transit time is ignored.)

14.2.3 Acct-Input-Octets

ATTRIBUTE Acct-Input-Octets 42 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many octets have been received from the port over the course of this service being provided, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.2.4 Acct-Input-Packets

ATTRIBUTE Acct-Input-Packets 47 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many packets have been received from the port over the course of this service being provided to a framed user, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.2.5 Acct-Output-Octets

ATTRIBUTE Acct-Output-Octets 43 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many octets have been sent to the port in the course of delivering this service, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.2.6 Acct-Output-Packets

ATTRIBUTE Acct-Output-Packets 48 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many packets have been sent to the port in the course of delivering this service to a framed user, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.2.7 Acct-Session-Id

ATTRIBUTE Acct-Session-Id 44 string

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute is a unique accounting ID to make it easy to match start and stop records in a log file. The start and stop records for a given session must have the same Acct-Session-Id. An Accounting-Request packet must have an Acct-Session-Id. An Access-Request packet may have an Acct-Session-Id; if it does, then the NAS must use the same Acct-Session-Id in the Accounting-Request packets for that session.

14.2.8 Acct-Session-Time

ATTRIBUTE Acct-Session-Time 46 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

This attribute indicates how many seconds the user has received service for, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.2.9 Acct-Status-Type

ATTRIBUTE Acct-Status-Type 40 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

VALUE Acct-Status-Type Start 1 VALUE Acct-Status-Type Stop 2 VALUE Acct-Status-Type Alive 3 VALUE Acct-Status-Type Accounting-On 7 VALUE Acct-Status-Type Accounting-Off 8

This attribute indicates whether this Accounting-Request marks the beginning of the user service (Start) or the end (Stop).

It may also be used to mark the start of accounting (for example, upon booting) by specifying Accounting-On and to mark the end of accounting (for example, just before a scheduled reboot) by specifying Accounting-Off.

A special value Alive or Interim-Update indicates the packet that contains some additional data to the initial Start record or to the last Alive record.

14.2.10 Acct-Terminate-Cause

ATTRIBUTE Acct-Terminate-Cause 49 integer

	Users:	--
	Hints:	--
	Huntgroups:	--
	Additivity:	N/A
	Proxy propagated:	N/A

VALUE Acct-Terminate-Cause User-Request 1 VALUE Acct-Terminate-Cause Lost-Carrier 2 VALUE Acct-Terminate-Cause Lost-Service 3 VALUE Acct-Terminate-Cause Idle-Timeout 4 VALUE Acct-Terminate-Cause Session-Timeout 5 VALUE Acct-Terminate-Cause Admin-Reset 6 VALUE Acct-Terminate-Cause Admin-Reboot 7 VALUE Acct-Terminate-Cause Port-Error 8 VALUE Acct-Terminate-Cause NAS-Error 9 VALUE Acct-Terminate-Cause NAS-Request 10 VALUE Acct-Terminate-Cause NAS-Reboot 11 VALUE Acct-Terminate-Cause Port-Unneeded 12 VALUE Acct-Terminate-Cause Port-Preempted 13 VALUE Acct-Terminate-Cause Port-Suspended 14 VALUE Acct-Terminate-Cause Service-Unavailable 15 VALUE Acct-Terminate-Cause Callback 16 VALUE Acct-Terminate-Cause User-Error 17 VALUE Acct-Terminate-Cause Host-Request 18

This attribute indicates how the session was terminated, and can only be present in Accounting-Request records where Acct-Status-Type is set to Stop.

14.3 Radius Internal Attributes

These are attributes used by GNU Radius during the processing of a request. They are never returned to the NAS. Mostly, they are used in matching rules.

14.3.1 Acct-Ext-Program
14.3.2 Acct-Type
14.3.4 Auth-Data
14.3.3 Auth-Failure-Trigger
14.3.5 Auth-Type
14.3.6 Crypt-Password
14.3.7 Exec-Program-Wait
14.3.8 Exec-Program
14.3.9 Fall-Through
14.3.10 Group
14.3.11 Hint
14.3.12 Huntgroup-Name
14.3.13 Log-Mode-Mask
14.3.14 Login-Time
14.3.15 Match-Profile
14.3.16 Menu
14.3.17 Pam-Auth
14.3.18 Prefix
14.3.19 Proxy-Replied
14.3.20 Realm-Name
14.3.21 Replace-User-Name
14.3.22 Rewrite-Function
14.3.23 Scheme-Acct-Procedure
14.3.24 Scheme-Procedure
14.3.25 Simultaneous-Use
14.3.26 Strip-User-Name
14.3.27 Suffix
14.3.28 Termination-Menu

14.3.1 Acct-Ext-Program

ATTRIBUTE Acct-Ext-Program 2008 string

	Users:	--
	Hints:	-R
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	N/A

The Acct-Ext-Program attribute can be used in RHS of an `raddb/hints' to require the execution of an external accounting program or filter. If the attribute value starts with a vertical bar (`|'), then the attribute specifies the filter program to be used. If it starts with a slash (`/'), then it is understood as the full pathname and arguments for the external program to be executed. Using any other character as the start of this string results in error.

The command line can reference any attributes from both check and reply pairlists using attribute macros (see section 5.14 Macro Substitution).

Before the execution of the program, radiusd switches to the uid and gid of the user daemon and the group daemon. You can override these defaults by setting variables exec-program-user and exec-program-group in configuration file to proper values (see section The option statement).

The accounting program must exit with status 0 to indicate a successful accounting.

14.3.2 Acct-Type

ATTRIBUTE Acct-Type 2003 integer

	Users:	L-
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Append
	Proxy propagated:	N/A

VALUE Acct-Type None 0 VALUE Acct-Type System 1 VALUE Acct-Type Detail 2 VALUE Acct-Type SQL 3

The Acct-Type allows one to control which accounting methods must be used for a given user or group of users. In the absence of this attribute, all currently enabled accounting types are used. See section 8. Accounting, for more information about accounting types.

14.3.3 Auth-Failure-Trigger

This attribute specifies an external program or a Scheme expression to be run upon an authentication failure. The handling of this attribute depends upon its value:

If the value of Auth-Failure-Trigger begins with `/', it is taken to contain a command line for invoking an external program. In this case radiusd invokes the program much the same way it does when handling Exec-Program attribute, i.e. the program is invoked with standard input closed, its standard output and standard error are captured and redirected to `radlog/radius.stderr' file, the return value of the program is ignored.

If the value of Auth-Failure-Trigger begins with `(', it is executed it as a Scheme expression. The return value of the expression is ignored.

This attribute is designed as a means to provide special handling for authentication failures. It can be used, for example, to increase failure counters and to block accounts after a specified number of authentication failures occurs. See section 7.10 Controlling Authentication Probes, for the detailed discussion of its usage.

<FIXME> There is no corresponding Auth-Success-Trigger... Exec-Program or Scheme-Procedure may be used for the purpose, the latter, however, is not able to execute s-exps. At the time of this writing the release 1.3 is being prepared, so I do not want to introduce any possibly destabilizing changes. This will be fixed in future releases. </>

14.3.4 Auth-Data

ATTRIBUTE Auth-Data 2006 string

	Users:	L-
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Replace
	Proxy propagated:	N/A

The Auth-Data can be used to pass additional data to the authentication methods that need them. In version 1.3 of GNU Radius, this attribute may be used in conjunction with the SQL and Pam authentication types. When used with the Pam authentication type, this attribute holds the name of the PAM service to use. This attribute is temporarily appended to the authentication request, so its value can be referenced to as %C{Auth-Data}. See section 5.11.2 Authentication Server Parameters, for an example of of using the Auth-Data attribute in `raddb/sqlserver':

14.3.5 Auth-Type

ATTRIBUTE Auth-Type 1000 integer

	Users:	L-
	Hints:	-R
	Huntgroups:	-R
	Additivity:	Append
	Proxy propagated:	No

VALUE Auth-Type Local 0 VALUE Auth-Type System 1 VALUE Auth-Type Crypt-Local 3 VALUE Auth-Type Reject 4 VALUE Auth-Type SQL 252 VALUE Auth-Type Pam 253 VALUE Auth-Type Accept 254

This attribute tells the server which type of authentication to apply to a particular user. It can be used in the LHS of the user's profile (see section 7. Authentication.)

Radius interprets values of Auth-Type attribute as follows:

Local

The value of the User-Password attribute from the record is taken as a cleantext password and is compared against the User-Password value from the input packet.

System

This means that a user's password is stored in a system password type. Radius queries the operating system to determine if the user name and password supplied in the incoming packet are O.K.

Crypt-Local

The value of the User-Password attribute from the record is taken as an MD5 hash on the user's password. Radius generates MD5 hash on the supplied User-Password value and compares the two strings.

Reject

Authentication fails.

Accept

Authentication succeeds.

SQL

Mysql

The MD5-encrypted user's password is queried from the SQL database (7.6 SQL Authentication Type). Mysql is an alias maintained for compatibility with other versions of Radius.

Pam

The user-name--password combination is checked using PAM.

14.3.6 Crypt-Password

ATTRIBUTE Crypt-Password 1006 string

	Users:	L-
	Hints:	--
	Huntgroups:	--
	Additivity:	Append
	Proxy propagated:	No

This attribute is intended to be used in user's profile LHS. It specifies the MD5 hash of the user's password. When this attribute is present, Auth-Type = Crypt-Local is assumed. If both Auth-Type and Crypt-Password are present, the value of Auth-Type is ignored.

See section 14.3.5 Auth-Type.

14.3.7 Exec-Program-Wait

ATTRIBUTE Exec-Program-Wait 1039 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	No

When present in the RHS, the Exec-Program-Wait attribute specifies the program to be executed when the entry matches. If the attribute value string starts with vertical bar (`|'), then the attribute specifies the filter program to be used. If it starts with slash (`/'), then it is understood as the full pathname and arguments for the external program to be executed. Using any other character as the start of this string results in error.

14.3.7.1 Running an External Program
14.3.7.2 Using an External Filter

14.3.7.1 Running an External Program

The command line can reference any attributes from both check and reply pairlists using attribute macros see section 5.14 Macro Substitution.

Before the execution of the program, radiusd switches to uid and gid of the user daemon and the group daemon. You can override these defaults by setting the variable exec-program-user in the configuration file to a proper value. See section The option statement.

The daemon will wait until the program terminates. The return value of its execution determines whether the entry matches. If the program exits with a nonzero code, then the match fails. If it exits with a zero code, the match succeeds. In this case the standard output of the program is read and parsed as if it were a pairlist. The attributes thus obtained are added to the entry's reply attributes.

Example.

Suppose the `users' file contains the following entry:

DEFAULT Auth-Type = System, Simultaneous-Use = 1 Exec-Program-Wait = "/usr/local/sbin/telauth \ %C{User-Name} \ %C{Calling-Station-Id}"

Then, upon successful matching, the program `/usr/local/sbin/telauth' will be executed. It will get as its arguments the values of the User-Name and Calling-Station-Id attributes from the request pairs.

The `/usr/local/sbin/telauth' can, for example, contain the following:

#! /bin/sh DB=/var/db/userlist if grep "$1:$2" $DB; then echo "Service-Type = Login," echo "Session-Timeout = 1200" exit 0 else echo "Reply-Message = \ \"You are not authorized to log in\"" exit 1 fi

It is assumed that `/var/db/userlist' contains a list of username:caller-id pairs for those users that are authorized to use login service.

14.3.7.2 Using an External Filter

If the value of Exec-Program-Wait attribute begins with `|', radiusd strips this character from the value and uses the resulting string as a name of the predefined external filter. Such filter must be declared in `raddb/config' (see section 5.1.10 filters statement).

Example.

DEFAULT Auth-Type = System, Simultaneous-Use = 1 Exec-Program-Wait = "|myfilter"

and let the `raddb/config' contain the following (6):

filters { filter myfilter { exec-path "/usr/libexec/myfilter"; error-log "myfilter.log"; auth { input-format "%C{User-Name} %C{Calling-Station-Id}"; wait-reply yes; }; }; };

Then, upon successful authentication, the program /usr/libexec/myfilter will be invoked, if it hasn't already been started for this thread. Any output it sends to its standard error will be redirected to the file `myfilter.log' in the current logging directory. A string consisting of the user's login name and his calling station ID followed by a newline will be sent to the program.

The following is a sample /usr/libexec/myfilter written in the shell:

#! /bin/sh DB=/var/db/userlist while read NAME CLID do if grep "$1:$2" $DB; then echo "0 Service-Type = Login, Session-Timeout = 1200" else echo "1 Reply-Message = \ \"You are not authorized to log in\"" fi done

14.3.8 Exec-Program

ATTRIBUTE Exec-Program 1038 string

	Users:	-R
	Hints:	--
	Huntgroups:	--
	Additivity:	Replace
	Proxy propagated:	No

When present in the RHS, the Exec-Program attribute specifies the full pathname and arguments for the program to be executed when the entry matches.

The command line can reference any attributes from both check and reply pairlists, using attribute macros (see section 5.14 Macro Substitution).

Before the execution of the program, radiusd switches to the uid and gid of the user daemon and the group daemon. You can override these defaults by setting variables exec-program-user and exec-program-group in configuration file to proper values The option statement.

The daemon does not wait for the process to terminate.

Example

Suppose the `users' file contains the following entry:

DEFAULT Auth-Type = System, Simultaneous-Use = 1 Exec-Program = "/usr/local/sbin/logauth \ %C{User-Name} \ %C{Calling-Station-Id}"

Then, upon successful matching, the program `/usr/local/sbin/logauth' will be executed. It will get as its arguments the values of the User-Name and Calling-Station-Id attributes from the request pairs.

14.3.9 Fall-Through

ATTRIBUTE Fall-Through 1036 integer

	Users:	LR
	Hints:	LR
	Huntgroups:	--
	Additivity:	Append
	Proxy propagated:	No

VALUE Fall-Through No 0 VALUE Fall-Through Yes 1

The Fall-Through attribute should be used in the reply list. If its value is set to Yes in a particular record, that tells Radius to continue looking up other records even when the record at hand matches the request. It can be used to provide default values for several profiles.

Consider the following example. Let's suppose the `users' file contains the following:

johns Auth-Type = SQL Framed-IP-Address = 11.10.10.251, Fall-Through = Yes smith Auth-Type = SQL Framed-IP-Address = 11.10.10.252, Fall-Through = Yes DEFAULT NAS-IP-Address = 11.10.10.1 Service-Type = Framed-User, Framed-Protocol = PPP

Then after successful matching of a particular user's record, the matching will continue until it finds the DEFAULT entry, which will add its RHS to the reply pairs for this request. The effect is that, if user `johns' authenticates successfully she gets the following reply pairs:

Service-Type = Framed-User, Framed-Protocol = PPP, Framed-IP-Address = 11.10.10.251

whereas user smith gets

Service-Type = Framed-User, Framed-Protocol = PPP, Framed-IP-Address = 11.10.10.252

Note that the attribute Fall-Through itself is never returned to the NAS.

14.3.10 Group

ATTRIBUTE Group 1005 string

	Users:	L-
	Hints:	L-
	Huntgroups:	LR
	Additivity:	Append
	Proxy propagated:	No

14.3.11 Hint

ATTRIBUTE Hint 1040 string

	Users:	L-
	Hints:	-R
	Huntg