path: root/sbin/isakmpd/isakmpd.conf.5

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.\" Manual page, using -mandoc macros
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.Dd October 10, 1998
.Dt ISAKMPD.CONF 5
.Os
.Sh NAME
.Nm isakmpd.conf
.Nd configuration file for isakmpd
.Sh DESCRIPTION
.Nm
is the configuration file for the
.Nm isakmpd
daemon managing security association and key management for the
IPSEC layer of the kernel's networking stack.
.Pp
The file is of a well known type of format called .INI style, named after
the suffix used by an overrated windowing environment for its configuration
files.
This format consists of sections, each beginning with a line looking like:
.Bd -literal
[Section name]
.Ed
Between the brackets is the name of the section following this section header.
Inside a section many tag/value pairs can be stored, each one looking like:
.Bd -literal
Tag=Value
.Ed
If the value needs more space than fits on a single line it's possible to
continue it on the next by ending the first with a backspace character
immediately before the newline character.
This method can extend a value for an arbitrary amount of lines.
.Pp
Comments can be put anywhere in the file by using a hash mark
.Pq Sq \&# .
Then the comment goes on to the end of the line.
.Pp
Often the right-hand side values consist of other section names.
This results in a tree structure.
Some values are treated as a list of several scalar values, such lists always
use comma as the separator.
Some values are formatted like this: X,Y:Z, which
is an offer/accept syntax, where X is a value we offer and Y:Z is a range of
accepted values, inclusive.
.Pp
.Ss Roots
.Bl -hang -width 12n
.It Em General
Generic global configuration parameters
.Bl -tag -width 12n
.It Em Policy-File
The name of the file that contains
.Xr KeyNote 4
policies. The default is "/etc/isakmpd/isakmpd.policy".
.It Em Retransmits
How many times should a message be retransmitted before giving up.
.It Em Check-interval
The interval between watchdog checks of connections we want up at all times.
.It Em Exchange-max-time
How many seconds should an exchange maximally take to setup
before we give up.
.It Em Listen-on
A list of IP-addresses OK to listen on.
This list is used as
a filter for the set of addresses the interfaces configured
provides.
This means that we won't see if an address given
here does not exist on this host, and thus no error is given for
that case.
.It Em Shared-SADB
If this tag is defined, whatever the value is, some semantics of
.Nm
are changed so that multiple instances can run on top of one SADB
and setup SAs with eachother.
Specifically this means replay
protection will not be asked for, and errors that can occur when
updating an SA with its parameters a 2nd time will be ignored.
.El
.It Em Phase 1
ISAKMP SA negotiation parameter root
.Bl -tag -width 12n
.It Em <IP-address>
A name of the ISAKMP peer at the given IP-address.
This name is used as the section name for further information to be found.
Look at <ISAKMP-peer> below.
.El
.It Em Phase 2
IPsec SA negotiation parameter root
.Bl -tag -width 12n
.It Em Connections
A list of directed IPSec "connection" names that should be brought up
automatically, either on first use if the system supports it, or at
startup of the daemon.
These names are section names where further information can be found.
Look at <IPSec-connection> below.
Normally any connection mentioned here are treated as part of the
"Passive-connection" list we present below, however there is a
flag: "Active-only" that disables this behaviour.
This too is mentioned in the <IPSec-connection> section, in the "Flags" tag.
.It Em Passive-connections
A list of IPSec "connection" names we recognize and accept initiations for.
These names are section names where further information can be found.
Look at <IPSec-connection> below.
Currently only the Local-ID and Remote-ID tags
are looked at in those sections, as they are matched against the IDs given
by the initiator.
.El
.It Em X509-Certificates
.Bl -tag -width 12n
.It Em Ca-directory
A directory containing PEM certificates of certification authorities
that we trust to sign other certificates.  Note that for a CA to be
really trusted, it needs to be somehow referred to by policy, in
.Xr isakmpd.policy 5 .
The certificates in this directory are used for the actual X.509
authentication and for cross-referencing policies that refer to
Distinguished Names (DNs). Keeping a separate directory (as opposed
to integrating policies and X.509 CA certificates) allows for maintenance
of a list of "well known" CAs without actually having to trust all (or any)
of them.
.It Em Cert-directory
A directory containing PEM certificates that we trust to be valid.
These certificates are used in preference to those passed in messages and
are required to have a SubjectAltName extension.
.It Em Accept-self-signed
If this tag is defined, whatever the value is, certificates that
do not originate from a trusted CA but are self-signed will be
accepted.
.It Em Private-key
The private key matching the public key of our certificate (which should be
in the "Cert-directory", and have a subjectAltName matching our ID, so far
that is our IP-address).
.El
.El
.Ss Referred-to sections
.Bl -hang -width 12n
.It Em <ISAKMP-peer>
Parameters for negotiation with an ISAKMP peer
.Bl -tag -width 12n
.It Em Phase
The constant
.Li 1 ,
as ISAKMP-peers and IPSec-connections
really are handled by the same code inside isakmpd.
.It Em Transport
The name of the transport protocol, normally
.Li udp .
.It Em Listen-address
The Local IP-address to use, if we are multi-homed, or have aliases.
.It Em Address
The IP-address of the peer.
.It Em Port
In case of UDP, the UDP port number to send to.
This is optional, the
default value is 500 which is the IANA-registered number for ISAKMP.
.It Em Configuration
The name of the ISAKMP-configuration section to use.
Look at <ISAKMP-configuration> below.
.It Em Authentication
Authentication data for this specific peer.
In the case of preshared key, this is the key value itself.
.It Em ID
If existent, the name of the section that describes the
local client ID that we should present to our peer. If not present, it
defaults to the address of the local interface we are sending packets
over to the remote daemon. Look at <Phase1-ID> below.
.It Em Flags
A comma-separated list of flags controlling the further
handling of the ISAKMP SA.
Currently there are no specific ISAKMP SA flags defined.
.It Em Next-hop
A Linux FreeS/WAN specific value which should be the IP address of the
next hop along the path to reach the peer, usually a router.
.El
.It Em <Phase1-ID>
.Bl -tag -width 12n
.It Em ID-type
The ID type as given by the RFCs.
For Phase 1 this is currently
.Li IPV4_ADDR ,
.Li IPV4_ADDR_SUBNET ,
.Li FQDN , 
or
.Li USER_FQDN .
.It Em Address
If the ID-type is
.Li IPV4_ADDR ,
this tag should exist and be an IP-address.
.It Em Network
If the ID-type is
.Li IPV4_ADDR_SUBNET
this tag should exist and
be a network address.
.It Em Netmask
If the ID-type is
.Li IPV4_ADDR_SUBNET
this tag should exist and
be a network subnet mask.
.It Em Name
If the ID-type is
.Li FQDN
or
.Li USER_FQDN ,
this tag should exist and contain a domain name or a user@domain
string respectively.
.El
.It Em <ISAKMP-configuration>
.Bl -tag -width 12n
.It Em DOI
The domain of interpretation as given by the RFCs.
Normally
.Li IPSEC .
.It Em EXCHANGE_TYPE
The exchange type as given by the RFCs.
For main mode this is
.Li ID_PROT
and for aggressive mode it is
.Li AGGRESSIVE .
.It Em Transforms
A list of proposed transforms to use for protecting the
ISAKMP traffic.
These are actually names for sections
further describing the transforms.
Look at <ISAKMP-transform> below.
.El
.It Em <ISAKMP-transform>
.Bl -tag -width 12n
.It Em ENCRYPTION_ALGORITHM
The encryption algorithm as the RFCs name it, or ANY to denote that any
encryption algorithm proposed will be accepted.
.It Em KEY_LENGTH
For encryption algorithms with variable key length, this is
where the offered/accepted keylengths are described.
The value is of the offer-accept kind described above.
.It Em HASH_ALGORITHM
The hash algorithm as the RFCs name it, or ANY.
.It Em AUTHENTICATION_METHOD
The authentication method as the RFCs name it, or ANY.
.It Em GROUP_DESCRIPTION
The group used for Diffie-Hellman exponentiations, or ANY.
The name are symbolic, like
.Li MODP_768 , MODP_1024 , EC_155
and
.Li EC_185 .
.It Em PRF
The algorithm to use for the keyed pseudo-random function (used for key
derivation and authentication in Phase 1), or ANY.
.It Em Life
A list of lifetime descriptions, or ANY. In the former case, each
element is in itself a name of the section that defines the lifetime.
Look at <Lifetime> below. If it is set to ANY, then any type of
proposed lifetime type and value will be accepted.
.El
.It Em <Lifetime>
.Bl -tag -width 12n
.It Em LIFE_TYPE
.Li SECONDS
or
.Li BYTES
depending on the type of the duration. Notice that this field may NOT
be set to ANY.
.It Em LIFE_DURATION
An offer/accept kind of value, see above. Can also be set to ANY.
.El
.It Em <IPSec-connection>
.Bl -tag -width 12n
.It Em Phase
The constant
.Li 2 ,
as ISAKMP-peers and IPSec-connections
really are handled by the same code inside isakmpd.
.It Em ISAKMP-peer
The name of the ISAKMP-peer which to talk to in order to
set up this connection.
The value is the name of an <ISAKMP-peer> section.
See above.
.It Em Configuration
The name of the IPSec-configuration section to use.
Look at <IPSec-configuration> below.
.It Em Local-ID
If existent, the name of the section that describes the
optional local client ID that we should present to our peer.
It is also used when we act as responders to find out what
<IPSec-connection> we are dealing with.
Look at <IPSec-ID> below.
.It Em Remote-ID
If existent, the name of the section that describes the
optional remote client ID that we should present to our peer.
It is also used when we act as responders to find out what
<IPSec-connection> we are dealing with.
Look at <IPSec-ID> below.
.It Em Flags
A comma-separated list of flags controlling the further
handling of the IPSec SA.
Currently only one flag is defined:
.Bl -tag -width 12n
.It Em Active-only
If this flag is given and this <IPSec-connection> is part of the phase 2
connections we automatically keep up, it will not automatically be used for
accepting connections from the peer.
.El
.El
.It Em <IPSec-configuration>
.Bl -tag -width 12n
.It Em DOI
The domain of interpretation as given by the RFCs.
Normally
.Li IPSEC .
.It Em EXCHANGE_TYPE
The exchange type as given by the RFCs.
For quick mode this is
.Li QUICK_MODE .
.It Em Suites
A list of protection suites (bundles of protocols) usable for
protecting the IP traffic.
Each of the list elements is a name of an <IPSec-suite> section.
See below.
.El
.It Em <IPSec-suite>
.Bl -tag -width 12n
.It Em Protocols
A list of the protocols included in this protection suite.
Each of the list elements is a name of an <IPSec-protocol>
section.
See below.
.El
.It Em <IPSec-protocol>
.Bl -tag -width 12n
.It Em PROTOCOL_ID
The protocol as given by the RFCs.
Acceptable values today are
.Li IPSEC_AH
and
.Li IPSEC_ESP .
.It Em Transforms
A list of transforms usable for implementing the protocol.
Each of the list elements is a name of an <IPSec-transform>
section.
See below.
.It Em ReplayWindow
The size of the window used for replay protection.
This is normally left alone.
Look at the
.Nm ESP
and
.Nm AH
RFCs for a better description.
.El
.It Em <IPSec-transform>
.Bl -tag -width 12n
.It Em TRANSFORM_ID
The transform ID as given by the RFCs.
.It Em ENCAPSULATION_MODE
The encapsulation mode as given by the RFCs.
This means TRANSPORT or TUNNEL.
.It Em AUTHENTICATION_ALGORITHM
The optional authentication algorithm in the case of this
being an ESP transform.
.It Em GROUP_DESCRIPTION
An optional (provides PFS if present) Diffie-Hellman group
description.
The values are the same as GROUP_DESCRIPTION's
in <ISAKMP-transform> sections shown above.
.It Em Life
List of lifetimes, each element is a <Lifetime> section name.
.El
.It Em <IPSec-ID>
.Bl -tag -width 12n
.It Em ID-type
The ID type as given by the RFCs.
For IPSec this is currently
.Li IPV4_ADDR
or
.Li IPV4_ADDR_SUBNET .
.It Em Address
If the ID-type is
.Li IPV4_ADDR ,
this tag should exist and be an IP-address.
.It Em Network
If the ID-type is
.Li IPV4_ADDR_SUBNET
this tag should exist and
be a network address.
.It Em Netmask
If the ID-type is
.Li IPV4_ADDR_SUBNET
this tag should exist and
be a network subnet mask.
.El
.El
.Sh EXAMPLE
An example of a configuration file:
.Pp
.Bd -literal
# A configuration sample for the isakmpd ISAKMP/Oakley (aka IKE) daemon.

[General]
Policy-File=		/etc/isakmpd/isakmpd.policy
Retransmits=		5
Exchange-max-time=	120
Listen-on=		10.1.0.2

# Incoming phase 1 negotiations are multiplexed on the source IP address
[Phase 1]
10.1.0.1=		ISAKMP-peer-west

# These connections are walked over after config file parsing and told
# to the application layer so that it will inform us when traffic wants to
# pass over them.  This means we can do on-demand keying.
[Phase 2]
Connections=		IPsec-east-west

[ISAKMP-peer-west]
Phase=			1
Transport=		udp
Local-address=		10.1.0.2
Address=		10.1.0.1
# Default values for "Port" commented out
#Port=			isakmp
#Port=			500
Configuration=		Default-main-mode
Authentication=		mekmitasdigoat
Flags=			Stayalive

[IPsec-east-west]
Phase=			2
ISAKMP-peer=		ISAKMP-peer-west
Configuration=		Default-quick-mode
Local-ID=		Net-east
Remote-ID=		Net-west
Flags=			Stayalive

[Net-west]
ID-type=		IPV4_ADDR_SUBNET
Network=		192.168.1.0
Netmask=		255.255.255.0

[Net-east]
ID-type=		IPV4_ADDR_SUBNET
Network=		192.168.2.0
Netmask=		255.255.255.0

# Main mode descriptions

[Default-main-mode]
DOI=			IPSEC
EXCHANGE_TYPE=		ID_PROT
Transforms=		3DES-SHA

# Certificates stored in PEM format
[X509-certificates]
CA-directory=           /etc/isakmpd/ca/
Cert-directory=         /etc/isakmpd/certs/
Private-key=		/etc/isakmpd/private/local.key

# Main mode transforms
######################

# DES

[DES-MD5]
ENCRYPTION_ALGORITHM=	DES_CBC
HASH_ALGORITHM=		MD5
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	MODP_768
Life=			LIFE_600_SECS,LIFE_1000_KB

[DES-MD5-NO-VOL-LIFE]
ENCRYPTION_ALGORITHM=	DES_CBC
HASH_ALGORITHM=		MD5
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	MODP_768
Life=			LIFE_600_SECS

[DES-SHA]
ENCRYPTION_ALGORITHM=	DES_CBC
HASH_ALGORITHM=		SHA
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	MODP_768
Life=			LIFE_600_SECS,LIFE_1000_KB

# 3DES

[3DES-SHA]
ENCRYPTION_ALGORITHM=	3DES_CBC
HASH_ALGORITHM=		SHA
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	MODP_1024
Life=			LIFE_3600_SECS

# Blowfish

[BLF-SHA-M1024]
ENCRYPTION_ALGORITHM=	BLOWFISH_CBC
KEY_LENGTH=		128,96:192
HASH_ALGORITHM=		SHA
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	MODP_1024
Life=			LIFE_600_SECS,LIFE_1000_KB

[BLF-SHA-EC155]
ENCRYPTION_ALGORITHM=	BLOWFISH_CBC
KEY_LENGTH=		128,96:192
HASH_ALGORITHM=		SHA
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	EC2N_155
Life=			LIFE_600_SECS,LIFE_1000_KB

[BLF-MD5-EC155]
ENCRYPTION_ALGORITHM=	BLOWFISH_CBC
KEY_LENGTH=		128,96:192
HASH_ALGORITHM=		MD5
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	EC2N_155
Life=			LIFE_600_SECS,LIFE_1000_KB

[BLF-SHA-EC185]
ENCRYPTION_ALGORITHM=	BLOWFISH_CBC
KEY_LENGTH=		128,96:192
HASH_ALGORITHM=		SHA
AUTHENTICATION_METHOD=	PRE_SHARED
GROUP_DESCRIPTION=	EC2N_185
Life=			LIFE_600_SECS,LIFE_1000_KB

# Quick mode description
########################

[Default-quick-mode]
DOI=			IPSEC
EXCHANGE_TYPE=		QUICK_MODE
Suites=			QM-ESP-3DES-SHA-PFS-SUITE,QM-ESP-DES-MD5-SUITE

# Quick mode protection suites
##############################

# DES

[QM-ESP-DES-SUITE]
Protocols=		QM-ESP-DES

[QM-ESP-DES-PFS-SUITE]
Protocols=		QM-ESP-DES-PFS

[QM-ESP-DES-MD5-SUITE]
Protocols=		QM-ESP-DES-MD5

[QM-ESP-DES-MD5-PFS-SUITE]
Protocols=		QM-ESP-DES-MD5-PFS

[QM-ESP-DES-SHA-SUITE]
Protocols=		QM-ESP-DES-SHA

[QM-ESP-DES-SHA-PFS-SUITE]
Protocols=		QM-ESP-DES-SHA-PFS

# 3DES

[QM-ESP-3DES-SHA-SUITE]
Protocols=		QM-ESP-3DES-SHA

[QM-ESP-3DES-SHA-PFS-SUITE]
Protocols=		QM-ESP-3DES-SHA-PFS

# AH

[QM-AH-MD5-SUITE]
Protocols=		QM-AH-MD5

[QM-AH-MD5-PFS-SUITE]
Protocols=		QM-AH-MD5-PFS

# AH + ESP

[QM-AH-MD5-ESP-DES-SUITE]
Protocols=		QM-AH-MD5,QM-ESP-DES

[QM-AH-MD5-ESP-DES-MD5-SUITE]
Protocols=		QM-AH-MD5,QM-ESP-DES-MD5

[QM-ESP-DES-MD5-AH-MD5-SUITE]
Protocols=		QM-ESP-DES-MD5,QM-AH-MD5

# Quick mode protocols

# DES

[QM-ESP-DES]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-DES-XF

[QM-ESP-DES-MD5]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-DES-MD5-XF

[QM-ESP-DES-MD5-PFS]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-DES-MD5-PFS-XF

[QM-ESP-DES-SHA]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-DES-SHA-XF

# 3DES

[QM-ESP-3DES-SHA]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-3DES-SHA-XF

[QM-ESP-3DES-SHA-PFS]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-3DES-SHA-PFS-XF

[QM-ESP-3DES-SHA-TRP]
PROTOCOL_ID=		IPSEC_ESP
Transforms=		QM-ESP-3DES-SHA-TRP-XF

# AH MD5

[QM-AH-MD5]
PROTOCOL_ID=		IPSEC_AH
Transforms=		QM-AH-MD5-XF

[QM-AH-MD5-PFS]
PROTOCOL_ID=		IPSEC_AH
Transforms=		QM-AH-MD5-PFS-XF

# Quick mode transforms

# ESP DES+MD5

[QM-ESP-DES-XF]
TRANSFORM_ID=		DES
ENCAPSULATION_MODE=	TUNNEL
Life=			LIFE_600_SECS

[QM-ESP-DES-MD5-XF]
TRANSFORM_ID=		DES
ENCAPSULATION_MODE=	TUNNEL
AUTHENTICATION_ALGORITHM=	HMAC_MD5
Life=			LIFE_600_SECS

[QM-ESP-DES-MD5-PFS-XF]
TRANSFORM_ID=		DES
ENCAPSULATION_MODE=	TUNNEL
GROUP_DESCRIPTION=	MODP_768
AUTHENTICATION_ALGORITHM=	HMAC_MD5
Life=			LIFE_600_SECS

[QM-ESP-DES-SHA-XF]
TRANSFORM_ID=		DES
ENCAPSULATION_MODE=	TUNNEL
AUTHENTICATION_ALGORITHM=	HMAC_SHA
Life=			LIFE_600_SECS

# 3DES

[QM-ESP-3DES-SHA-XF]
TRANSFORM_ID=		3DES
ENCAPSULATION_MODE=	TUNNEL
AUTHENTICATION_ALGORITHM=	HMAC_SHA
Life=			LIFE_600_SECS

[QM-ESP-3DES-SHA-PFS-XF]
TRANSFORM_ID=		3DES
ENCAPSULATION_MODE=	TUNNEL
AUTHENTICATION_ALGORITHM=	HMAC_SHA
GROUP_DESCRIPTION=	MODP_1024
Life=			LIFE_600_SECS

[QM-ESP-3DES-SHA-TRP-XF]
TRANSFORM_ID=		3DES
ENCAPSULATION_MODE=	TRANSPORT
AUTHENTICATION_ALGORITHM=	HMAC_SHA
Life=			LIFE_600_SECS

# AH

[QM-AH-MD5-XF]
TRANSFORM_ID=		MD5
ENCAPSULATION_MODE=	TUNNEL
AUTHENTICATION_ALGORITHM=	HMAC_MD5
Life=			LIFE_600_SECS

[QM-AH-MD5-PFS-XF]
TRANSFORM_ID=		MD5
ENCAPSULATION_MODE=	TUNNEL
GROUP_DESCRIPTION=	MODP_768
Life=			LIFE_600_SECS

[LIFE_600_SECS]
LIFE_TYPE=		SECONDS
LIFE_DURATION=		600,450:720

[LIFE_3600_SECS]
LIFE_TYPE=		SECONDS
LIFE_DURATION=		3600,1800:7200

[LIFE_1000_KB]
LIFE_TYPE=		KILOBYTES
LIFE_DURATION=		1000,768:1536

[LIFE_32_MB]
LIFE_TYPE=		KILOBYTES
LIFE_DURATION=		32768,16384:65536

[LIFE_4.5_GB]
LIFE_TYPE=		KILOBYTES
LIFE_DURATION=		4608000,4096000:8192000
.Ed
.Sh SEE ALSO
.Xr ipsec 4 ,
.Xr keynote 4 ,
.Xr isakmpd.policy 5 ,
.Xr isakmpd 8