Provided by: ike_2.2.1+dfsg-6_amd64 
NAME
iked.conf — Internet Key Exchange Daemon Configuration File
DESCRIPTION
The iked.conf file is used to configure iked(8) ( Internet Key Exchange Daemon ). The
parameters supplied are used to negotiate ISAKMP ( phase1 ) and IPsec ( phase2 ) SAs for
IPsec capable hosts.
SYNTAX
The configuration parameters are expressed as a series of sections containing a number of
statements. Sections begin with a keyword optionally followed by a parameter list. All
statements for a section are enclosed using the ‘{’ and ‘}’ characters. Statements begin
with a keyword optionally followed by a parameter list and are terminated with the ‘;’
character. Lines that begin with the ‘#’ character are treated as comments.
This document denotes keywords using this font and user supplied parameters using this font.
Optional parameters are enclosed using the ‘[’ and ‘]’ characters. Multiple keywords that
may be valid for a single parameter are enclosed using the ‘(’ and ‘)’ characters and
separated using the ‘|’ character.
The defined parameter types are as follows ...
number A decimal number
label A string comprised of alphanumeric characters
quoted A quoted string enclosed in ‘"’ characters
address An IP address expressed as x.x.x.x
network An IP network and prefix length expressed as x.x.x.x/y
Daemon Section
daemon { statements }
Specifies the general configuration for iked(8) operation. This includes parameters
related to the basic network configuration, log file and debug output. Only one
daemon section should be defined.
socket (ike | natt) [address] number;
An address and port number that should be used for ike or natt
communications. If the address parameter is omitted, the daemon will
attempt to bind to any address for the given port number. If no socket
statements are specified, the daemon will attempt to bind to all interfaces
for both ike and natt using the default port numbers ( 500 & 4500
respectively ). Note, the natt keyword can only be specified if the daemon
was compiled with natt support.
retry_count number;
The number of times an exchange packet should be resent to a peer. The
default value for this parameter is 2.
retry_delay number;
The number of seconds to wait between packet resend attempts. The default
value for this parameter is 10.
log_file quoted;
The path and file name that should be used for log output.
log_level (none | error | info | debug | loud | decode);
The log output detail level. The default value for this parameter is none.
pcap_decrypt quoted;
The path and file name that should be used to dump decrypted ike packets in
pcap format. If no pcap_decrypt statement is specified, this feature is
disabled.
pcap_encrypt quoted;
The path and file name that should be used to dump encrypted ike packets in
pcap format. If no pcap_encrypt statement is specified, this feature is
disabled.
dhcp_file quoted;
The path and file name that should be used to store a dhcp mac address seed
value for dhcp over ipsec negotiation. If no file is present, the file will
be created.
Network Group Section
netgroup label { statements }
Specifies a group of networks that can be refferred to by the assigned label.
Multiple netgroup sections may be defined.
network;
A network to be associated with this network group.
XAuth LDAP Section
xauth_ldap { statements }
Specifies the LDAP configuration to be used for when the xauth_source is set to ldap
for a given peer section. Only one xauth_ldap section should be defined. Note, an
xauth_ldap section can only be defined if the daemon was compiled with LDAP support.
version number;
The LDAP protocol version to be used ( 2 or 3 ). The default value for this
parameter is 3.
url quoted;
The LDAP server url. For example, a url may look like
"ldap://ldap.shrew.net:389".
base quoted;
The base dn to be used for LDAP searches. For example, a base dn may look
like "ou=users,dc=shrew,dc=net".
subtree (enable | disable);
The search scope to be used for LDAP searches. If enabled, searches will be
performed using the subtree search scope. If disabled, searches will be
performed using the one level search scope. The default value for this
parameter is disable.
bind_dn quoted;
The dn to bind as before performing LDAP searches. If this parameter is
omitted, searches will be performed using anonymous binds.
bind_pw quoted;
The password to use when a bind_dn is specified.
attr_user quoted;
The attribute used to specify a user name in the LDAP directory. For
example, if a user dn is "cn=user,dc=shrew,dc=net" then the attribute would
be "cn". The default value for this parameter is "cn".
attr_group quoted;
The attribute used to specify a group name in the LDAP directory. For
example, if a group dn is "cn=group,dc=shrew,dc=net" then the attribute
would be "cn". The default value for this parameter is "cn".
attr_member quoted;
The attribute used to specify a group member in the LDAP directory. The
default value for this parameter is "member".
XConf Local Section
xconf_local { statements }
Specifies the Configuration Exchange settings to be used when the xconf_source is
set to local for a given peer section. Only one xconf_local section should be
defined.
network4 network [number];
The network that will be used to define a local address pool. An optional
number can be specified to restrict the pool to a specific size. An address
from this pool along with the network mask are passed to a peer when
requested.
dnss4 address;
The dns server address to be passed to a peer when requested.
nbns4 address;
The netbios name server address to be passed to a peer when requested.
dns_suffix quoted;
The dns suffix to be passed to a peer when requested.
dns_list quoted quoted ...;
A list of split dns suffixes to be passed to a peer when requested. A peer
can use this list to selectivly forward dns requests to the dnss4 server
when a query matches one of the supplied split dns suffixes.
banner quoted;
The path to a file that contains a login banner to be passed to a peer when
requested.
pfs_group number;
The pfs group number to be passed to a peer when requested.
Peer Section
peer address [number] { statements }
Specifies the parameters used to communicate with a given peer by address and
optional port number. If the port value is omitted, the default isakmp port number
will be used ( 500 ). If an address of 0.0.0.0 is used, the peer section can be used
for any remote host. Multiple peer sections may be defined.
contact (initiator | responder | both);
Specifies the contact type when establishing phase1 negotiations with a
peer. If initiator is used, the daemon will initiate contact but deny
contact initiated by the peer. If responder is used, the daemon will allow
contact initiated by the peer but will not initiate contact. If both is
specified, the daemon will initiate contact and allow the peer to initiate
contact.
exchange (main | aggressive);
Specifies the exchange type to be used for phase1 negotiations with a peer.
The default value for this parameter is main.
natt_mode (disable | enable | force [draft | rfc]);
Specifies the NAT Traversal mode to be used for phase1 negotiations with a
peer. If disable is used, natt negotiations will not be attempted. If enable
is used, the daemon will attempt to negotiate and use NAT Traversal when
appropriate. If force is used, the daemon will use NAT Traversal even if the
peer does not negotiate support for this feature. When force is used, the
draft or rfc modifiers can optionally be specified to select the required
method with rfc being the default if omitted. The default value for this
parameter is disable.
natt_port number;
Specifies the NAT Traversal port number to be used for phase1 negotiations
with a peer when acting as an initiator. The default value for this
parameter is 4500.
natt_rate number;
Specifies the number of seconds between sending NAT Traversal keep-alive
messages. The default value for this parameter is 15.
dpd_mode (disable | enable | force);
Specifies the Dead Peer Detection mode to be used with a peer. If disable is
used, DPD negotiations will not be attempted. If enable is used, the daemon
will attempt to negotiate and use DPD when appropriate. If force is used,
the daemon will use DPD even if the peer does not negotiate support for this
feature. The default value for this parameter is disable.
dpd_delay number;
Specifies the number of seconds between sending DPD are-you-there messages.
The default value for this parameter is 15.
dpd_retry number;
Specifies the number times a DPD are-you-there message will be retransmitted
when no response is received. The default value for this parameter is 5.
frag_ike_mode (disable | enable | force);
Specifies the IKE Fragmentation mode to be used with a peer. If disable is
used, IKE Fragmentation negotiations will not be attemted. If enable is
used, the daemon will attempt to negotiate and use IKE Fragmentation when
appropriate. If force is used, the daemon will use IKE Fragmentation even if
the peer does not negotiate support for this feature. The default value for
this parameter is disable.
frag_ike_size number;
Specifies the maximum number of bytes for an IKE Fragment. The default value
for this parameter is 520.
frag_esp_mode (disable | enable);
Specifies the ESP Fragmentation mode to be used with a peer. If disable is
used, the daemon will create IPsec SAs without the ESP Fragmentation option.
If enable is used, the daemon will create IPsec SAs with the ESP
Fragmentation option. The default value for this parameter is disable.
Note, ESP Fragmentation is only valid for IPsec SAs using NAT Traversal. The
operating system must also have support for this feature. ( NetBSD Only )
frag_esp_size number;
Specifies the maximum number of bytes for an ESP Fragment. The default value
for this parameter is 520.
peerid (local | remote) type ...;
Specifies either the local identity to be sent to a peer or the remote
identity to be compared with the value received from a peer during phase1
negotiations. The valid identity types are as follows ...
address [address];
An IP Address. If the address value is omitted, the network address
used during phase1 negotiations is used.
fqdn quoted;
A Fully Qualified Domain Name string.
ufqdn quoted;
A User Fully Qualified Domain Name string.
asn1dn [quoted];
An ASN.1 Distinguished Name string. If the quoted value is omitted,
the daemon will aquire the DN from the subject field contained
within the certificate.
authdata type ...;
Specifies the authentication data to use during phase1 negotiations. The
valid authentication data types are as follows ...
psk quoted;
A Pre Shared Secret.
ca quoted [quoted];
A path to a OpenSSL PEM or PSK12 file that contains the Remote
Certificate Autority. In the case where a PSK12 file is encrypted,
the second quoted parameter specifies the file password.
cert quoted [quoted];
A path to a OpenSSL PEM or PSK12 file that contains the Local Public
Certificate. In the case where a PSK12 file is encrypted, the second
quoted parameter specifies the file password.
pkey quoted [quoted];
A path to a OpenSSL PEM or PSK12 file that contains the Local
Private Key. In the case where a PSK12 file is encrypted, the second
quoted parameter specifies the password.
life_check level;
Specifies the behavior when validating peer lifetime proposal values. The
default level is claim. The valid levels are as follows ...
obey A responder will always use the initiators value.
strict A responder will use the initiators value if it is shorter than the
responders. A responder will reject the proposal if the initiators
value is greater than the responders.
claim A responder will use the initiators value if it is shorter than the
responders. A responder will use its own value if it is shorter
than the initiators. In the second case, the responder will send a
RESPONDER-LIFETIME notification to the initiator when responding to
phase2 proposals.
exact; A responder will reject the proposal if the initiators value is not
equal to the responders.
xauth_source (local | ldap) [quoted];
Sepcifies the Extended Authentication source to be used for user
authentication post phase1 negotitations. The optional quoted value
specifies a group name that can be used to restrict access to only users
that are valid members of the group. If local is used, the peer supplied
credentials will be compared to the local account database. If ldap is used,
the peer supplied credentials will be compared to an LDAP account database.
The LDAP source configuration is defined in the xauth_ldap section. The
default value for this parameter is local.
xconf_source local [(push | pull)];
Sepcifies the Configuration Exchange source to be used when responding to
peer configuration requests. If local is used, the daemon will supply
configuration information defined in the xconf_local section. The default
value for this parameter is local.
plcy_mode (disable | config | compat);
Specifies the policy generation mode. When disable is used, no policy
generation is performed. When config mode is used, policy generation is
performed during Configuration Exchange. This allows the daemon to generate
polices using the peers private tunnel address. When compat mode is used,
policy generation is performed post phase1 negotiations. This allows the
daemon to interoperate with peers that do not support Configuration
Exchanges.
plcy_list { statements }
Specifies a list of network groups and parameters that can be used to
perform policy generation. If no plcy_list is defined but plcy_mode is set
to config or compat, the daemon operates as if a single include statement
was used that specified a netmap defining all networks.
(include | exclude) label [quoted];
Specifies a netgroup by label for use with policy generation. When
include is used, the daemon will generate appropriate IPsec policies
and pass all netgroup defined networks during the Configuration
Exchange if requested. A peer would use this configuration
information to selectively tunnel all traffic destined for any one
of these networks. If exclude is used, the daemon will generate
appropriate discard policies and pass all netgroup defined networks
during the Configuration Exchange if requested. A peer would use
this configuration information to selectively bypass IPsec
processing for all traffic destined to any one of these networks.
The optional quoted string specifies a group name that can be used
to restrict processing of this netgroup to only users that are valid
members of the group. If XAuth is not performed, statements that
define a group name are skipped.
proposal type { statements }
Specifies a proposal to be used during SA negotiations with a peer. The
valid proposal types are as follows ...
isakmp An ISAKMP proposal supports the following ...
auth type;
Define the authentication mechanism for the ISAKMP proposal.
The accepted types are hybrid_xauth_rsa, mutual_xauth_rsa,
mutual_xauth_psk, mutual_rsa and mutual_psk.
ciph type [number];
Define the cipher algorithm for this proposal. The optional
number specifies the keylength for algorithms that support
it. The accepted types are aes, blowfish, 3des, cast and
des.
hash type;
Define the hash algorithm for this proposal. The accepted
types are md5 and sha1.
dhgr number;
Define the DH group for this proposal. The accepted values
are 1, 2, 5, 14, 15, 16, 17, 18 and 16.
ah An AH proposal supports the following ...
hash type;
Define the hash algorithm for this proposal. The accepted
types are md5 and sha1.
dhgr number;
Define the DH group for this proposal. The accepted values
are 1, 2, 5, 14, 15, 16, 17, 18 and 16.
esp An ESP proposal supports the following ...
ciph type [number];
Define the cipher algorithm for this proposal. The optional
number specifies the keylength for algorithms that support
it. The accepted types are aes, blowfish, 3des, cast and
des.
hmac type;
Define the message authentication algorithm for this
proposal. The accepted types are md5 and sha1.
dhgr number;
Define the DH group for this proposal. The accepted values
are 1, 2, 5, 14, 15, 16, 17, 18 and 16.
ipcomp An IPCOMP proposal supports the following ...
comp type;
Define the compression algorithm for this proposal. The
accepted types are deflate and lzs.
All proposals types support the following ...
life_sec number;
Define the lifetime in seconds for this proposal.
life_kbs number;
Define the lifetime in kilobytes for this proposal.
EXAMPLES
This section contains a few iked configuration examples.
The first example shows a configuration that only defines the parameters required to support
client connectivity mode with NATT and debug options enabled.
daemon
{
socket ike 500;
socket natt 4500;
log_level debug;
log_file "/var/log/iked.log";
pcap_decrypt "/var/log/ike-decrypt.pcap";
pcap_encrypt "/var/log/ike-encrypt.pcap";
retry_delay 10;
retry_count 2;
}
The second example shows a configuration that supports simple peer to peer negotiations
using mutual preshared key authentication.
daemon
{
socket ike 500;
log_level debug;
log_file "/var/log/iked.log";
}
peer 1.2.3.4
{
exchange main;
peerid local address;
peerid remote address;
authdata psk "sharedsecret";
life_check claim;
proposal isakmp
{
auth mutual_psk;
life_sec 28800;
life_kbs 0;
}
proposal esp
{
life_sec 3800;
life_kbs 0;
}
}
The third example shows a configuration that supports client gateway negotiations using
mutual preshared key authentication with xauth, nat traversal, dead peer detection, ike
fragmentation and policy generation. The daemon would allow xauth users that are members of
the "remote" group to connect to the gateway. Policies would be generated to allow a peer
access to the 10.1.1.0/24 and 1.3.3.0/24 networks with the exception of 1.1.1.15/32 which be
accessed directly ( not via IPsec ). Peers that use an xauth user account that is a member
of the "netadmin" group would have additional policies generated to allow access to the
10.4.4.0/24 network.
daemon
{
socket ike 500;
socket natt 4500;
log_level debug;
log_file "/var/log/iked.log";
pcap_decrypt "/var/log/ike-decrypt.pcap";
pcap_encrypt "/var/log/ike-encrypt.pcap";
}
netgroup allow
{
10.1.1.0/24;
10.3.3.0/24;
}
netgroup deny
{
1.1.1.15/32;
}
netgroup protect
{
10.4.4.0/24;
}
xconf_local
{
network4 10.2.1.0/24;
dnss4 10.1.1.1;
nbns4 10.1.1.1;
dns_suffix "foo.com";
dns_list "foo.com" "bar.com";
banner "/etc/iked.motd";
pfs_group 2;
}
peer 0.0.0.0
{
contact responder;
exchange main;
natt_mode enable;
dpd_mode enable;
frag_ike_mode enable;
peerid local address;
peerid remote address;
authdata psk "sharedsecret";
life_check claim;
xauth_source local "remote";
xconf_source local;
plcy_mode config;
plcy_list
{
include allow;
exclude deny;
include protect "netadmin";
}
proposal isakmp
{
auth mutual_xauth_psk;
ciph 3des;
hash md5;
dhgr 2;
life_sec 28800;
life_kbs 0;
}
proposal esp
{
life_sec 3800;
life_kbs 0;
}
}
SEE ALSO
ipsec(4), iked(8), setkey(8)
HISTORY
The iked.conf parser was written by Matthew Grooms ( mgrooms@shrew.net ) as part of the
Shrew Soft ( http://www.shrew.net ) family of IPsec products.