Ubuntu Manpage: racoon.conf — configuration file for racoon

Provided by: racoon_0.8.2+20140711-5_amd64

NAME

       racoon.conf — configuration file for racoon

DESCRIPTION

racoon.conf is the configuration file for the racoon(8) ISAKMP daemon. racoon(8) negotiates security
associations for itself (ISAKMP SA, or phase 1 SA) and for kernel IPsec (IPsec SA, or phase 2 SA). The
file consists of a sequence of directives and statements. Each directive is composed by a tag and
statements, enclosed by ‘{’ and ‘}’. Lines beginning with ‘#’ are comments.

Meta Syntax
Keywords and special characters that the parser expects exactly are displayed using this font.
Parameters are specified with this font. Square brackets (‘[’ and ‘]’) are used to show optional
keywords and parameters. Note that you have to pay attention when this manual is describing port
numbers. The port number is always enclosed by ‘[’ and ‘]’. In this case, the port number is not an
optional keyword. If it is possible to omit the port number, the expression becomes [[port]]. The
vertical bar (‘|’) is used to indicate a choice between optional parameters. Parentheses (‘(’ and ‘)’)
are used to group keywords and parameters when necessary. Major parameters are listed below.

number means a hexadecimal or a decimal number. The former must be prefixed with ‘0x’.
string
path
file means any string enclosed in ‘"’ (double quotes).
address means IPv6 and/or IPv4 address.
port means a TCP/UDP port number. The port number is always enclosed by ‘[’ and ‘]’.
timeunit is one of following: sec, secs, second, seconds, min, mins, minute, minutes, hour, hours.

Privilege separation
privsep { statements }
Specifies privilege separation parameters. When enabled, these enable racoon(8) to operate with
an unprivileged instance doing most of the work, while a privileged instance takes care of
performing the following operations as root: reading PSK and private keys, launching hook
scripts, and validating passwords against system databases or against PAM. Please note that
using privilege separation makes changes to the listen and paths sections ignored upon
configuration reloads. A racoon(8) restart is required if you want such changes to be taken into
account.

user user;
The user to which the unprivileged instance of racoon(8), should switch. This can be a
quoted user name or a numeric UID.
group group;
The group the unprivileged instance of racoon(8), should switch. This can be a quoted
group name or a numeric GID.
chroot path;
A directory to which the unprivileged instance of racoon(8) should chroot(2). This
directory should hold a tree where the following files must be reachable:
/dev/random
/dev/urandom
The certificates
The file containing the Xauth banner

The PSK file, the private keys, and the hook scripts are accessed through the privileged
instance of racoon(8) and do not need to be reachable in the chroot(2)'ed tree.

Path Specification
This section specifies various paths used by racoon. When running in privilege separation mode,
certificate and script paths are mandatory. A racoon(8) restart is required if you want path changes to
be taken into account.
path include path;
Specifies a path to include a file. See “File Inclusion”.
path pre_shared_key file;
Specifies a file containing pre-shared key(s) for various ID(s). See “Pre-shared key File”.
path certificate path;
racoon(8) will search this directory if a certificate or certificate request is received. If you
run with privilege separation, racoon(8) will refuse to use a certificate stored outside of this
directory.
path backupsa file;
Specifies a file to which SA information negotiated by racoon should be stored. racoon(8) will
install SA(s) from the file when started with the -B flag. The file is growing because racoon(8)
simply adds SAs to it. You should maintain the file manually.
path script path;
racoon(8) will search this directory for scripts hooks. If you run with privilege separation,
racoon(8) will refuse to execute a script stored outside of this directory.
path pidfile file;
Specifies file where to store PID of process. If path starts with / it is treated as an absolute
path. Otherwise, it is treated as a relative path to the VARRUN directory specified at
compilation time. Default is racoon.pid.

File Inclusion
include file
Specifies other configuration files to be included.

Timer Specification
timer { statements }
This section specifies various timer values used by racoon.

counter number;
The maximum number of retries to send. The default is 5.
interval number timeunit;
The interval to resend, in seconds. The default time is 10 seconds.
persend number;
The number of packets per send. The default is 1.
phase1 number timeunit;
The maximum time it should take to complete phase 1. The default time is 15 seconds.
phase2 number timeunit;
The maximum time it should take to complete phase 2. The default time is 10 seconds.
natt_keepalive number timeunit;
The interval between sending NAT-Traversal keep-alive packets. The default time is 20
seconds. Set to 0s to disable keep-alive packets.

Listening Port Specification
listen { statements }
If no listen directive is specified, racoon(8) will listen on all available interface addresses.
The following is the list of valid statements:

isakmp address [[port]];
If this is specified, racoon(8) will only listen on the defined address. The default
port is 500, which is specified by IANA. You can provide more than one address
definition.
isakmp_natt address [port];
Same as isakmp but also sets the socket options to accept UDP-encapsulated ESP traffic
for NAT-Traversal. If you plan to use NAT-T, you should provide at least one address
with port 4500, which is specified by IANA. There is no default.
strict_address;
Requires that all addresses for ISAKMP be bound. This statement will be ignored if you
do not specify address definitions.
When running in privilege separation mode, you need to restart racoon(8) to have changes to the
listen section taken into account.

The listen section can also be used to specify the admin socket mode and ownership if racoon was
built with support for admin port.
adminsock path [owner group mode];
The path, owner, and group values specify the socket path, owner, and group. They must
be quoted. The defaults are /var/racoon/racoon.sock, UID 0, and GID 0. mode is the
access mode in octal. The default is 0600.
adminsock disabled;
This directive tells racoon to not listen on the admin socket.

Miscellaneous Global Parameters
gss_id_enc enctype;
Older versions of racoon(8) used ISO-Latin-1 as the encoding of the GSS-API identifier attribute.
For interoperability with Microsoft Windows' GSS-API authentication scheme, the default encoding
has been changed to UTF-16LE. The gss_id_enc parameter allows racoon(8) to be configured to use
the old encoding for compatibility with existing racoon(8) installations. The following are
valid values for enctype:

utf-16le
Use UTF-16LE to encode the GSS-API identifier attribute. This is the default encoding.
This encoding is compatible with Microsoft Windows.
latin1 Use ISO-Latin-1 to encode the GSS-API identifier attribute. This is the encoding used by
older versions of racoon(8).

pfkey_buffer kBytes
Specifies the socket send/receive buffer size in kilobytes. Numerous kernel PF_KEY
implementations have problems with dumping SAD/SDP with large amount of entries (this happens
when 100s to 1000s of tunnels are configured).

The default value of 0 leaves everything at the OS-specific default value. If the default buffer
size is greater than what is specified here racoon will not decrease it.

This problem is known to be fixed in Linux 2.6.25 and later.

Remote Nodes Specifications
remote name [inherit parent_name] ({ statements } | ;)
Specifies the IKE phase 1 parameters for each remote node.

If connection is initiated using racoonctl, a unique match using the remote IP must be found or
the remote block name has to be given. For received acquires (kernel notices traffic requiring a
new SA) the remote IP and remoteid from matching sainfo block are used to decide the remoteblock.
If no uniquely matching remoteblock is found using these criteria, no connection attempt is done.

When acting as responder, racoon picks the first proposal that has one or more acceptable remote
configurations. When determining if a remote specification is matching the following information
is checked:
• The remote IP is checked against remote_address.
• ISAKMP exchange type is checked against exchange_mode.
• ISAKMP SA attributes must match a proposal block.
• The remote identity is matched against peers_identifier if verify_identifier is on.
• If a certificate request was received, it must match the issuer of certificate_type x509
certificate. If certificate request without issuer name was sent, the match_empty_cr
parameter specifies whether or not remote block matches.

Similarly, NAT-T is enabled if any of the initial remote configuration candidates allow NAT-T.

Sections with inherit parent statements (where parent is either address or a keyword anonymous)
that have all values predefined to those of a given parent. In these sections it is enough to
redefine only the changed parameters.

The following are valid statements.

remote_address address;
Defines the IP address of the peer.
exchange_mode (main | aggressive | base);
Defines the exchange mode for phase 1 when racoon is the initiator. It also means the
acceptable exchange mode when racoon is the responder. More than one mode can be
specified by separating them with a comma. All of the modes are acceptable. The first
exchange mode is what racoon uses when it is the initiator.
doi ipsec_doi;
Means to use IPsec DOI as specified in RFC 2407. You can omit this statement.
situation identity_only;
Means to use SIT_IDENTITY_ONLY as specified in RFC 2407. You can omit this statement.
my_identifier [qualifier] idtype ...;
Specifies the identifier sent to the remote host and the type to use in the phase 1
negotiation. address, fqdn, user_fqdn, keyid, and asn1dn can be used as an idtype. The
qualifier is currently only used for keyid, and can be either file or tag. The possible
values are :
my_identifier address [address];
The type is the IP address. This is the default type if you do not specify an
identifier to use.
my_identifier user_fqdn string;
The type is a USER_FQDN (user fully-qualified domain name).
my_identifier fqdn string;
The type is a FQDN (fully-qualified domain name).
my_identifier keyid [file] file;
The type is a KEY_ID, read from the file.
my_identifier keyid tag string;
The type is a KEY_ID, specified in the quoted string.
my_identifier asn1dn [string];
The type is an ASN.1 distinguished name. If string is omitted, racoon(8) will
get the DN from the Subject field in the certificate.
xauth_login [string];
Specifies the login to use in client-side Hybrid authentication. It is available only if
racoon(8) has been built with this option. The associated password is looked up in the
pre-shared key files, using the login string as the key id.
peers_identifier idtype ...;
Specifies the peer's identifier to be received. If it is not defined then racoon(8) will
not verify the peer's identifier in ID payload transmitted from the peer. If it is
defined, the behavior of the verification depends on the flag of verify_identifier. The
usage of idtype is the same as my_identifier except that the individual component values
of an asn1dn identifier may specified as * to match any value (e.g. "C=XX, O=MyOrg, OU=*,
CN=Mine"). The format of the specification should correspond to RFC 2253; in particular,
commas and certain other characters - ,=+<>#; - may be included in a name by preceding
them with a backslash "\", and arbitrary characters may be inserted in a name with the
"\nn" escape, where nn is the hex representation of the ascii value of the desired
character. Alternative acceptable peer identifiers may be specified by repeating the
peers_identifier statement.
verify_identifier (on | off);
If you want to verify the peer's identifier, set this to on. In this case, if the value
defined by peers_identifier is not the same as the peer's identifier in the ID payload,
the negotiation will fail. The default is off.
certificate_type certspec;
Specifies a certificate specification. certspec is one of followings:
x509 certfile privkeyfile;
certfile means a file name of a certificate. privkeyfile means a file name of a
secret key.
plain_rsa privkeyfile;
privkeyfile means a file name of a private key generated by plainrsa-gen(8).
Required for RSA authentication.
ca_type cacertspec;
Specifies a root certificate authority specification. cacertspec is one of followings:
x509 cacertfile;
cacertfile means a file name of the root certificate authority. Default is
/etc/openssl/cert.pem
mode_cfg (on | off);
Gather network information through ISAKMP mode configuration. Default is off.
weak_phase1_check (on | off);
Tells racoon to act on unencrypted deletion messages during phase 1. This is a small
security risk, so the default is off, meaning that racoon will keep on trying to
establish a connection even if the user credentials are wrong, for instance.
peers_certfile (dnssec | certfile | plain_rsa pubkeyfile);
If dnssec is defined, racoon(8) will ignore the CERT payload from the peer, and try to
get the peer's certificate from DNS instead. If certfile is defined, racoon(8) will
ignore the CERT payload from the peer, and will use this certificate as the peer's
certificate. If plain_rsa is defined, racoon(8) will expect pubkeyfile to be the peer's
public key that was generated by plainrsa-gen(8).
script script phase1_up
script script phase1_down
script script phase1_dead
Shell scripts that get executed when a phase 1 SA goes up or down, or when it is detected
as dead by DPD. All scripts get either phase1_up , phase1_down or phase1_dead as first
argument, and the following variables are set in their environment:
LOCAL_ADDR
The local address of the phase 1 SA.
LOCAL_PORT
The local port used for IKE for the phase 1 SA.
REMOTE_ADDR
The remote address of the phase 1 SA.
REMOTE_PORT
The remote port used for IKE for the phase 1 SA.
REMOTE_ID
The remote identity received in IKE for the phase 1 SA.
The following variables are only set if mode_cfg was enabled:
INTERNAL_ADDR4
An IPv4 internal address obtained by ISAKMP mode config.
INTERNAL_NETMASK4
An IPv4 internal netmask obtained by ISAKMP mode config.
INTERNAL_CIDR4
An IPv4 internal netmask obtained by ISAKMP mode config, in CIDR notation.
INTERNAL_DNS4
The first internal DNS server IPv4 address obtained by ISAKMP mode config.
INTERNAL_DNS4_LIST
A list of internal DNS servers IPv4 address obtained by ISAKMP mode config,
separated by spaces.
INTERNAL_WINS4
The first internal WINS server IPv4 address obtained by ISAKMP mode config.
INTERNAL_WINS4_LIST
A list of internal WINS servers IPv4 address obtained by ISAKMP mode config,
separated by spaces.
SPLIT_INCLUDE
The space separated list of IPv4 addresses and masks (address slash mask) that
define the networks to be encrypted (as opposed to the default where all the
traffic should be encrypted) ; obtained by ISAKMP mode config ; SPLIT_INCLUDE and
SPLIT_LOCAL are mutually exclusive.
SPLIT_LOCAL
The space separated list of IPv4 addresses and masks (address slash mask) that
define the networks to be considered local, and thus excluded from the tunnels ;
obtained by ISAKMP mode config.
SPLIT_INCLUDE_CIDR
Same as SPLIT_INCLUDE, with netmasks in CIDR notation.
SPLIT_LOCAL_CIDR
Same as SPLIT_LOCAL, with netmasks in CIDR notation.
DEFAULT_DOMAIN
The DNS default domain name obtained by ISAKMP mode config.
send_cert (on | off);
If you do not want to send a certificate, set this to off. The default is on.
send_cr (on | off);
If you do not want to send a certificate request, set this to off. The default is on.
match_empty_cr (on | off);
Specifies whether this remote block is a valid match when a non-specific certificate
request is received. The default is on.
verify_cert (on | off);
By default, the identifier sent by the remote host (as specified in its my_identifier
statement) is compared with the credentials in the certificate used to authenticate the
remote host as follows:
Type asn1dn:
The entire certificate subject name is compared with the identifier, e.g. "C=XX,
O=YY, ...".
Type address, fqdn, or user_fqdn:
The certificate's subjectAltName is compared with the identifier.
If the two do not match the negotiation will fail. If you do not want to verify the
identifier using the peer's certificate, set this to off.
lifetime time number timeunit;
Define a lifetime of a certain time which will be proposed in the phase 1 negotiations.
Any proposal will be accepted, and the attribute(s) will not be proposed to the peer if
you do not specify it (them). They can be individually specified in each proposal.
ike_frag (on | off | force);
Enable receiver-side IKE fragmentation if racoon(8) has been built with this feature. If
set to on, racoon will advertise itself as being capable of receiving packets split by
IKE fragmentation. This extension is there to work around broken firewalls that do not
work with fragmented UDP packets. IKE fragmentation is always enabled on the sender-
side, and it is used if the peer advertises itself as IKE fragmentation capable. By
selecting force, IKE Fragmentation will be used when racoon is acting as the initiator
even before the remote peer has advertised itself as IKE fragmentation capable.
esp_frag fraglen;
This option is only relevant if you use NAT traversal in tunnel mode. Its purpose is to
work around broken DSL routers that reject UDP fragments, by fragmenting the IP packets
before ESP encapsulation. The result is ESP over UDP of fragmented packets instead of
fragmented ESP over UDP packets (i.e., IP:UDP:ESP:frag(IP) instead of
frag(IP:UDP:ESP:IP)). fraglen is the maximum size of the fragments. 552 should work
anywhere, but the higher fraglen is, the better the performance.

Note that because PMTU discovery is broken on many sites, you will have to use MSS
clamping if you want TCP to work correctly.
initial_contact (on | off);
Enable this to send an INITIAL-CONTACT message. The default value is on. This message
is useful only when the responder implementation chooses an old SA when there are
multiple SAs with different established time and the initiator reboots. If racoon did
not send the message, the responder would use an old SA even when a new SA was
established. For systems that use a KAME derived IPSEC stack, the sysctl(8) variable
net.key.preferred_oldsa can be used to control this preference. When the value is zero,
the stack always uses a new SA.
passive (on | off);
If you do not want to initiate the negotiation, set this to on. The default value is
off. It is useful for a server.
proposal_check level;
Specifies the action of lifetime length, key length, and PFS of the phase 2 selection on
the responder side, and the action of lifetime check in phase 1. The default level is
strict. If the level is:
obey The responder will obey the initiator anytime.
strict If the responder's lifetime length is longer than the initiator's or the
responder's key length is shorter than the initiator's, the responder will use
the initiator's value. Otherwise, the proposal will be rejected. If PFS is not
required by the responder, the responder will obey the proposal. If PFS is
required by both sides and the responder's group is not equal to the initiator's,
then the responder will reject the proposal.
claim If the responder's lifetime length is longer than the initiator's or the
responder's key length is shorter than the initiator's, the responder will use
the initiator's value. If the responder's lifetime length is shorter than the
initiator's, the responder uses its own length AND sends a RESPONDER-LIFETIME
notify message to an initiator in the case of lifetime (phase 2 only). For PFS,
this directive behaves the same as strict.
exact If the initiator's lifetime or key length is not equal to the responder's, the
responder will reject the proposal. If PFS is required by both sides and the
responder's group is not equal to the initiator's, then the responder will reject
the proposal.
support_proxy (on | off);
If this value is set to on, then both values of ID payloads in the phase 2 exchange are
always used as the addresses of end-point of IPsec-SAs. The default is off.
generate_policy (on | off | require | unique);
This directive is for the responder. Therefore you should set passive to on in order
that racoon(8) only becomes a responder. If the responder does not have any policy in
SPD during phase 2 negotiation, and the directive is set to on, then racoon(8) will
choose the first proposal in the SA payload from the initiator, and generate policy
entries from the proposal. It is useful to negotiate with clients whose IP address is
allocated dynamically. Note that an inappropriate policy might be installed into the
responder's SPD by the initiator, so other communications might fail if such policies are
installed due to a policy mismatch between the initiator and the responder. on and
require values mean the same thing (generate a require policy). unique tells racoon to
set up unique policies, with a monotoning increasing reqid number (between 1 and
IPSEC_MANUAL_REQID_MAX). This directive is ignored in the initiator case. The default
value is off.
nat_traversal (on | off | force);
This directive enables use of the NAT-Traversal IPsec extension (NAT-T). NAT-T allows
one or both peers to reside behind a NAT gateway (i.e., doing address- or port-
translation). If a NAT gateway is detected during the phase 1 handshake, racoon will
attempt to negotiate the use of NAT-T with the remote peer. If the negotiation succeeds,
all ESP and AH packets for the given connection will be encapsulated into UDP datagrams
(port 4500, by default). Possible values are:
on NAT-T is used when a NAT gateway is detected between the peers.
off NAT-T is not proposed/accepted. This is the default.
force NAT-T is used regardless of whether a NAT gateway is detected between the peers
or not.
Please note that NAT-T support is a compile-time option. Although it is enabled in the
source distribution by default, it may not be available in your particular build. In
that case you will get a warning when using any NAT-T related config options.
dpd_delay delay;
This option activates the DPD and sets the time (in seconds) allowed between 2 proof of
liveliness requests. The default value is 0, which disables DPD monitoring, but still
negotiates DPD support.
dpd_retry delay;
If dpd_delay is set, this sets the delay (in seconds) to wait for a proof of liveliness
before considering it as failed and send another request. The default value is 5.
dpd_maxfail number;
If dpd_delay is set, this sets the maximum number of liveliness proofs to request
(without reply) before considering the peer is dead. The default value is 5.
rekey (on | off | force);
Enable automatic renegotiation of expired phase1 when there are non-dying phase2 SAs.
Possible values are:
force Rekeying is done unconditionally.
on Rekeying is done only if DPD monitoring is active. This is the default.
off No automatic rekeying. Do note that turning off automatic rekeying will result
in inaccurate DPD monitoring.
nonce_size number;
define the byte size of nonce value. Racoon can send any value although RFC2409
specifies that the value MUST be between 8 and 256 bytes. The default size is 16 bytes.
ph1id number;
An optional number to identify the remote proposal and to link it only with sainfos who
have the same number. Defaults to 0.
proposal { sub-substatements }
encryption_algorithm algorithm;
Specifies the encryption algorithm used for the phase 1 negotiation. This
directive must be defined. algorithm is one of following: des, 3des, blowfish,
cast128, aes, camellia for Oakley. For other transforms, this statement should
not be used.
hash_algorithm algorithm;
Defines the hash algorithm used for the phase 1 negotiation. This directive must
be defined. algorithm is one of following: md5, sha1, sha256, sha384, sha512 for
Oakley.
authentication_method type;
Defines the authentication method used for the phase 1 negotiation. This
directive must be defined. type is one of: pre_shared_key, rsasig (for plain RSA
authentication), gssapi_krb, hybrid_rsa_server, hybrid_rsa_client,
xauth_rsa_server, xauth_rsa_client, xauth_psk_server or xauth_psk_client.
dh_group group;
Defines the group used for the Diffie-Hellman exponentiations. This directive
must be defined. group is one of following: modp768, modp1024, modp1536,
modp2048, modp3072, modp4096, modp6144, modp8192. Or you can define 1, 2, 5, 14,
15, 16, 17, or 18 as the DH group number. When you want to use aggressive mode,
you must define the same DH group in each proposal.
lifetime time number timeunit;
Defines the lifetime of the phase 1 SA proposal. Refer to the description of the
lifetime directive defined in the remote directive.
gss_id string;
Defines the GSS-API endpoint name, to be included as an attribute in the SA, if
the gssapi_krb authentication method is used. If this is not defined, the
default value of ‘host/hostname’ is used, where hostname is the value returned by
the hostname(1) command.

remote (address | anonymous) [[port]] [inherit parent] { statements }
Deprecated format of specifying a remote block. This will be removed in future. It is a remnant
from time when remote block was decided solely based on the peers IP address.

This is equivalent to:

remote "address" [inherit "parent-address"] {
remote_address address;
}

Sainfo Specifications
sainfo (local_id | anonymous) (remote_id | clientaddr | anonymous) [from idtype [string]] [group string]
{ statements }
Defines the parameters of the IKE phase 2 (IPsec-SA establishment).

The local_id and remote_id strings are constructed like:

address address [/ prefix] [[port]] ul_proto

subnet address [/ prefix] [[port]] ul_proto

An id string should be expressed to match the exact value of an ID payload. This is not like a
filter rule. For example, if you define 3ffe:501:4819::/48 as local_id. 3ffe:501:4819:1000:/64
will not match. In the case of a longest prefix (selecting a single host), address instructs to
send ID type of ADDRESS while subnet instructs to send ID type of SUBNET. Otherwise, these
instructions are identical.

The anonymous keyword can be used to match any id. The clientaddr keyword can be used to match a
remote id that is equal to either the peer ip address or the mode_cfg ip address (if assigned).
This can be useful to restrict policy generation when racoon is acting as a client gateway for
peers with dynamic ip addresses.

The from keyword allows an sainfo to only match for peers that use a specific phase1 id value
during authentication. The group keyword allows an XAuth group membership check to be performed
for this sainfo section. When the mode_cfg auth source is set to system or ldap, the XAuth user
is verified to be a member of the specified group before allowing a matching SA to be negotiated.

pfs_group group;
define the group of Diffie-Hellman exponentiations. If you do not require PFS then you
can omit this directive. Any proposal will be accepted if you do not specify one. group
is one of following: modp768, modp1024, modp1536, modp2048, modp3072, modp4096, modp6144,
modp8192. Or you can define 1, 2, 5, 14, 15, 16, 17, or 18 as the DH group number.
lifetime time number timeunit;
define how long an IPsec-SA will be used, in timeunits. Any proposal will be accepted,
and no attribute(s) will be proposed to the peer if you do not specify it(them). See the
proposal_check directive.
remoteid number;
Sainfos will only be used if their remoteid matches the ph1id of the remote section used
for phase 1. Defaults to 0, which is also the default for ph1id.

racoon(8) does not have a list of security protocols to be negotiated. The list of security
protocols are passed by SPD in the kernel. Therefore you have to define all of the potential
algorithms in the phase 2 proposals even if there are algorithms which will not be used. These
algorithms are define by using the following three directives, with a single comma as the
separator. For algorithms that can take variable-length keys, algorithm names can be followed by
a key length, like “blowfish 448”. racoon(8) will compute the actual phase 2 proposals by
computing the permutation of the specified algorithms, and then combining them with the security
protocol specified by the SPD. For example, if des, 3des, hmac_md5, and hmac_sha1 are specified
as algorithms, we have four combinations for use with ESP, and two for AH. Then, based on the
SPD settings, racoon(8) will construct the actual proposals. If the SPD entry asks for ESP only,
there will be 4 proposals. If it asks for both AH and ESP, there will be 8 proposals. Note that
the kernel may not support the algorithm you have specified.
encryption_algorithm algorithms;
des, 3des, des_iv64, des_iv32, rc5, rc4, idea, 3idea, cast128, blowfish, null_enc,
twofish, rijndael, aes, camellia (used with ESP)
authentication_algorithm algorithms;
des, 3des, des_iv64, des_iv32, hmac_md5, hmac_sha1, hmac_sha256, hmac_sha384,
hmac_sha512, non_auth (used with ESP authentication and AH)
compression_algorithm algorithms;
deflate (used with IPComp)

Logging level
log level;
Defines the logging level. level is one of following: error, warning, notify, info, debug or
debug2. The default is info. If you set the logging level too high on slower machines, IKE
negotiation can fail due to timing constraint changes.

Specifies the way to pad
padding { statements }
specifies the padding format. The following are valid statements:
randomize (on | off);
Enables the use of a randomized value for padding. The default is on.
randomize_length (on | off);
The pad length will be random. The default is off.
maximum_length number;
Defines a maximum padding length. If randomize_length is off, this is ignored. The
default is 20 bytes.
exclusive_tail (on | off);
Means to put the number of pad bytes minus one into the last part of the padding. The
default is on.
strict_check (on | off);
Means to constrain the peer to set the number of pad bytes. The default is off.

ISAKMP mode configuration settings
mode_cfg { statements }
Defines the information to return for remote hosts' ISAKMP mode config requests. Also defines
the authentication source for remote peers authenticating through Xauth.

The following are valid statements:
auth_source (system | radius | pam | ldap);
Specifies the source for authentication of users through Xauth. system means to use the
Unix user database. This is the default. radius means to use a RADIUS server. It works
only if racoon(8) was built with libradius support. Radius configuration is handled by
statements in the radiuscfg section. pam means to use PAM. It works only if racoon(8)
was built with libpam support. ldap means to use LDAP. It works only if racoon(8) was
built with libldap support. LDAP configuration is handled by statements in the ldapcfg
section.
auth_groups group1, ...;
Specifies the group memberships for Xauth in quoted group name strings. When defined,
the authenticating user must be a member of at least one group for Xauth to succeed.
group_source (system | ldap);
Specifies the source for group validation of users through Xauth. system means to use
the Unix user database. This is the default. ldap means to use LDAP. It works only if
racoon(8) was built with libldap support and requires LDAP authentication. LDAP
configuration is handled by statements in the ldapcfg section.
conf_source (local | radius | ldap);
Specifies the source for IP addresses and netmask allocated through ISAKMP mode config.
local means to use the local IP pool defined by the network4 and pool_size statements.
This is the default. radius means to use a RADIUS server. It works only if racoon(8)
was built with libradius support and requires RADIUS authentication. RADIUS
configuration is handled by statements in the radiuscfg section. ldap means to use an
LDAP server. It works only if racoon(8) was built with libldap support and requires LDAP
authentication. LDAP configuration is handled by statements in the ldapcfg section.
accounting (none | system | radius | pam);
Enables or disables accounting for Xauth logins and logouts. The default is none which
disable accounting. Specifying system enables system accounting through utmp(5).
Specifying radius enables RADIUS accounting. It works only if racoon(8) was built with
libradius support and requires RADIUS authentication. RADIUS configuration is handled by
statements in the radiuscfg section. Specifying pam enables PAM accounting. It works
only if racoon(8) was build with libpam support and requires PAM authentication.
pool_size size
Specify the size of the IP address pool, either local or allocated through RADIUS.
conf_source selects the local pool or the RADIUS configuration, but in both
configurations, you cannot have more than size users connected at the same time. The
default is 255.
network4 address;
netmask4 address;
The local IP pool base address and network mask from which dynamically allocated IPv4
addresses should be taken. This is used if conf_source is set to local or if the RADIUS
server returned 255.255.255.254. Default is 0.0.0.0/0.0.0.0.
dns4 addresses;
A list of IPv4 addresses for DNS servers, separated by commas, or on multiple dns4 lines.
wins4 addresses;
A list of IPv4 address for WINS servers. The keyword
nbns4 can also be used as an alias for
wins4.
split_network (include | local_lan) network/mask, ...
The network configuration to send, in CIDR notation (e.g. 192.168.1.0/24). If include is
specified, the tunnel should be only used to encrypt the indicated destinations ;
otherwise, if local_lan is used, everything will pass through the tunnel but those
destinations.
default_domain domain;
The default DNS domain to send.
split_dns domain, ...
The split dns configuration to send, in quoted domain name strings. This list can be
used to describe a list of domain names for which a peer should query a modecfg assigned
dns server. DNS queries for all other domains would be handled locally. (Cisco VPN
client only).
banner path;
The path of a file displayed on the client at connection time. Default is /etc/motd.
auth_throttle delay;
On each failed Xauth authentication attempt, refuse new attempts for a set delay of
seconds. This is to avoid dictionary attacks on Xauth passwords. Default is one second.
Set to zero to disable authentication delay.
pfs_group group;
Sets the PFS group used in the client proposal (Cisco VPN client only). Default is 0.
save_passwd (on | off);
Allow the client to save the Xauth password (Cisco VPN client only). Default is off.

Ldap configuration settings
ldapcfg { statements }
Defines the parameters that will be used to communicate with an ldap server for xauth
authentication.

The following are valid statements:
version (2 | 3);
The ldap protocol version used to communicate with the server. The default is 3.
host (hostname | address);
The host name or ip address of the ldap server. The default is localhost.
port number;
The port that the ldap server is configured to listen on. The default is 389.
base distinguished name;
The ldap search base. This option has no default value.
subtree (on | off);
Use the subtree ldap search scope. Otherwise, use the one level search scope. The
default is off.
bind_dn distinguished name;
The user dn used to optionally bind as before performing ldap search operations. If this
option is not specified, anonymous binds are used.
bind_pw string;
The password used when binding as bind_dn.
attr_user attribute name;
The attribute used to specify a users name in an ldap directory. For example, if a user
dn is "cn=jdoe,dc=my,dc=net" then the attribute would be "cn". The default value is cn.
attr_addr attribute name;
attr_mask attribute name;
The attributes used to specify a users network address and subnet mask in an ldap
directory. These values are forwarded during mode_cfg negotiation when the conf_source
is set to ldap. The default values are racoon-address and racoon-netmask.
attr_group attribute name;
The attribute used to specify a group name in an ldap directory. For example, if a group
dn is "cn=users,dc=my,dc=net" then the attribute would be "cn". The default value is cn.
attr_member attribute name;
The attribute used to specify group membership in an ldap directory. The default value
is member.

Radius configuration settings
radiuscfg { statements }
Defines the parameters that will be used to communicate with radius servers for xauth
authentication. If radius is selected as the xauth authentication or accounting source and no
servers are defined in this section, settings from the system radius.conf(5) configuration file
will be used instead.

The following are valid statements:
auth (hostname | address) [port] sharedsecret;
The host name or ip address, optional port value and shared secret value of a radius
authentication server. Up to 5 radius authentication servers may be specified using
multiple lines.
acct (hostname | address) [port] sharedsecret;
The host name or ip address, optional port value and shared secret value of a radius
accounting server. Up to 5 radius accounting servers may be specified using multiple
lines.
timeout seconds;
The timeout for receiving replies from radius servers. The default is 3.
retries count;
The maximum number of repeated requests to make before giving up on a radius server. The
default is 3.

Special directives
complex_bundle (on | off);
defines the interpretation of proposal in the case of SA bundle. Normally “IP AH ESP IP payload”
is proposed as “AH tunnel and ESP tunnel”. The interpretation is more common to other IKE
implementations, however, it allows very limited set of combinations for proposals. With the
option enabled, it will be proposed as “AH transport and ESP tunnel”. The default value is off.

Pre-shared key File
The pre-shared key file defines pairs of identifiers and corresponding shared secret keys which are used
in the pre-shared key authentication method in phase 1. The pair in each line is separated by some
number of blanks and/or tab characters like in the hosts(5) file. Key can include blanks because
everything after the first blanks is interpreted as the secret key. Lines starting with ‘#’ are ignored.
Keys which start with ‘0x’ are interpreted as hexadecimal strings. Note that the file must be owned by
the user ID running racoon(8) (usually the privileged user), and must not be accessible by others.

EXAMPLES

       The following shows how the remote directive should be configured.

       path pre_shared_key "/usr/local/v6/etc/psk.txt" ;
       remote anonymous
       {
               exchange_mode aggressive,main,base;
               lifetime time 24 hour;
               proposal {
                       encryption_algorithm 3des;
                       hash_algorithm sha1;
                       authentication_method pre_shared_key;
                       dh_group 2;
               }
       }

       sainfo anonymous
       {
               pfs_group 2;
               lifetime time 12 hour ;
               encryption_algorithm 3des, blowfish 448, twofish, rijndael ;
               authentication_algorithm hmac_sha1, hmac_md5 ;
               compression_algorithm deflate ;
       }

       If you are configuring plain RSA authentication, the remote directive should look like the following:

       path certificate "/usr/local/v6/etc" ;
       remote anonymous
       {
               exchange_mode main,base ;
               lifetime time 12 hour ;
               certificate_type plain_rsa "/usr/local/v6/etc/myrsakey.priv";
               peers_certfile plain_rsa "/usr/local/v6/etc/yourrsakey.pub";
               proposal {
                               encryption_algorithm aes ;
                               hash_algorithm sha1 ;
                               authentication_method rsasig ;
                               dh_group 2 ;
               }
       }

       The following is a sample for the pre-shared key file.

       10.160.94.3     mekmitasdigoat
       172.16.1.133    0x12345678
       194.100.55.1    whatcertificatereally
       3ffe:501:410:ffff:200:86ff:fe05:80fa    mekmitasdigoat
       3ffe:501:410:ffff:210:4bff:fea2:8baa    mekmitasdigoat
       foo@kame.net    mekmitasdigoat
       foo.kame.net    hoge

HISTORY

       The racoon.conf configuration file first appeared in the “YIPS” Yokogawa IPsec implementation.

BUGS

       Some statements may not be handled by racoon(8) yet.

       Diffie-Hellman computation can take a very long time, and may cause unwanted timeouts, specifically  when
       a large D-H group is used.

SECURITY CONSIDERATIONS