RACOON.CONF(5)

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 }
remote name inherit parent_name;
    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

    or

    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, aes_gcm_16 (used with ESP)
    authentication_algorithm algorithms;
        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.
    uri (ldapuri);
        URI(s) referring to the ldap server(s); a list of URI, separated by whitespace or commas. It takes precedence over host/port.
    timeout (number);
        network timeout connecting to the ldap server(s). The default is the default connect timeout from the underlying protocol.
    tls (on | off);
        Use TLS with the ldap server. The default is off.
    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.
    debug (number);
        Set ldap debug level. The default value is 0.

  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.

If configured with ENABLE_WILDCARD_MATCH, this implementation allows a wildcard key “*”. This is allowed for the special case of a single user connecting to a gateway using an iPhone. On an iPhone, L2TP over IPSEC only supports main mode with pre-shared keys (no certificates). Unfortunately racoon only supports pre-shared-key lookup by address when identity protection is used, and since the iPhone does not have a specific IP address, we don't know what key to put in the pre-shared key file.

Sharing the connection with more than one user is strongly discouraged because any user can pretend to be the server since they know the pre-shared key. This means that any user can steal the traffic of any other user, by spoofing DNS which is not trivial but easy. Even worse, the malicious user will be able to then steal any other authentication data (CHAP/XAUTH etc.) that another user will supply to the compromised server, because it assumes that phase 1 is secured by the pre-shared key.

In summary, never use wildcard keys if your gateway is hosting more than one user.

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

SEE ALSO
racoon(8), racoonctl(8), setkey(8)

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
The use of IKE phase 1 aggressive mode is not recommended, as described in http://www.kb.cert.org/vuls/id/886601.