strongSwan

h1. strongswan.conf

h2. Overview

While the [[IpsecConf|ipsec.conf]] configuration file is well suited to define IPsec related configuration parameters, it is not useful for other strongSwan applications to read options from this file. The file is hard to parse and only [[IpsecStarter|ipsec starter]] is capable of doing so. As the number of components of the strongSwan project is continually growing, we needed a more flexible configuration file that is easy to extend and can be used by all components. The new configuration format consists of hierarchical sections and a list of key/value pairs in each section. Starting with the strongSwan 4.2.1 release, a default strongswan.conf file is installed in your sysconfdir, e.g. _/etc/strongswan.conf_.

h2. Syntax

Each section has a name, followed by C-Style curly brackets defining the sections body. Each section body contains a set of subsections and key/value pairs:

<pre>

settings := (section|keyvalue)*

section  := name { settings }

keyvalue := key = value\n

</pre>

Values must be terminated by a newline. Comments are possible using the #-character, but be careful: The parser implementation is currently limited and does not like brackets in comments. Section names and keys may contain any printable character except:

<pre>

. { } # \n \t space

</pre>

An example might look like this:

<pre>

a = b

section-one {

  somevalue = asdf

  subsection {

    othervalue = xxx

  }

  # yei, a comment 

  yetanother = zz

}

section-two {

  x = 12

}

</pre>

Indentation is optional, you may use tabs or spaces.

h2. Reading values

The config file is read by libstrongswan during library initialization. Values are accessed using a dot-separated section list and a key: 

Accessing *section-one.subsection.othervalue* will return *xxx*. Have a look at the settings interface (source:src/libstrongswan/settings.h) to learn how to query values.

h2. Defined keys

The following keys are currently defined (using dot notation).

|Key                                                |Default   |Description|

|\3. *charon section*                               |

|charon.block_threshold                             |5         |Maximum number of half-open IKE_SAs for a single peer IP|

|charon.close_ike_on_child_failure                  |no        |Close the IKE_SA if setup of the CHILD_SA along with IKE_AUTH failed|

|charon.cookie_threshold                            |10        |Number of half-open IKE_SAs that activate the cookie mechanism| 

|charon.dns1                                        |          |DNS server 1 assigned to peer via configuration payload (CP)|

|charon.dns2                                        |          |DNS server 2 assigned to peer via configuration payload (CP)|

|charon.dos_protection                              |yes       |Enable Denial of Service protection using cookies and aggressiveness checks|

|charon.filelog                                     |          |Section to define file loggers, see [[LoggerConfiguration]]|

|charon.flush_auth_cfg                              |no        ||

|charon.hash_and_url                                |no        |Enable hash and URL support|

|charon.ignore_routing_tables                       |          |A list of routing tables to be excluded from route lookup|

|charon.ikesa_table_segments                        |1         |Number of exclusively locked segments in the hash table|

|charon.ikesa_table_size                            |1         |Size of the IKE_SA hash table|

|charon.inactivity_close_ike                        |no        |Whether to close IKE_SA if the only CHILD_SA closed due to inactivity|

|charon.install_routes                              |yes       |Install routes into a separate routing table for established IPsec tunnels|

|charon.install_virtual_ip                          |yes       |Install virtual IP addresses|

|charon.keep_alive                                  |20s       |NAT keep alive interval|

|charon.load                                        |          |Plugins to load in IKEv2 charon daemon, see [[PluginLoad]]|

|charon.max_packet                                  |10000     |Maximum packet size accepted by charon|

|charon.multiple_authentication                     |yes       |Enable multiple authentication exchanges (RFC 4739)|

|charon.nbns1                                       |          |WINS server 1 assigned to peer via configuration payload (CP)|

|charon.nbns2                                       |          |WINS server 2 assigned to peer via configuration payload (CP)|

|charon.process_route                               |yes       |Process RTM_NEWROUTE and RTM_DELROUTE events|

|charon.receive_delay                               |0         |Delay for receiving packets, to simulate larger RTT|

|charon.receive_delay_response                      |yes       |Delay response messages|

|charon.receive_delay_request                       |yes       |Delay request messages|

|charon.receive_delay_type                          |0         |Specific IKEv2 message type to delay, 0 for any|

|charon.retransmit_base                             |1.8       |Base to use for calculating exponential back off, see [[Retransmission]]|

|charon.retransmit_timeout                          |4.0       |Timeout in seconds before sending first retransmit|

|charon.retransmit_tries                            |5         |Number of times to retransmit a packet before giving up|

|charon.reuse_ikesa                                 |yes       |Initiate CHILD_SA within existing IKE_SAs|

|charon.routing_table                               |          |Numerical routing table to install routes to|

|charon.routing_table_prio                          |          |Priority of the routing table|

|charon.send_delay                                  |0         |Delay for sending packets, to simulate larger RTT|

|charon.send_delay_response                         |yes       |Delay response messages|

|charon.send_delay_request                          |yes       |Delay request messages|

|charon.send_delay_type                             |0         |Specific IKEv2 message type to delay, 0 for any|

|charon.send_vendor_id                              |no        |Send strongSwan vendor ID payload|

|charon.syslog                                      |          |Section to define syslog loggers, see [[LoggerConfiguration]]|

|charon.threads                                     |16        |Number of worker threads in charon|

|\3. *charon plugins subsection*                    |

|charon.plugins.dhcp.identity_lease                 |no        |Derive user-defined MAC address from hash of IKEv2 identity|

|charon.plugins.dhcp.server                         |255.255.255.255|DHCP server unicast or broadcast IP address|

|charon.plugins.eap-aka.request_identity            |yes       ||

|charon.plugins.eap-aka-3ggp2.seq_check             |          ||

|charon.plugins.eap-gtc.pam_service                 |login     |PAM service to be used for authentication|

|charon.plugins.eap-radius.secret                   |          |Shared secret between RADIUS and NAS|

|charon.plugins.eap-radius.server                   |          |IP/Hostname of RADIUS server|

|charon.plugins.eap-radius.port                     |1812      |Port of RADIUS server (authentication)|

|charon.plugins.eap-radius.sockets                  |5         |Number of sockets (ports) to use, increase for high load|

|charon.plugins.eap-radius.nas_identifier           |strongSwan|NAS-Identifier to include in RADIUS messages|

|charon.plugins.eap-radius.eap_start                |no        |Send EAP-Start instead of EAP-Identity to start RADIUS conversation|

|charon.plugins.eap-radius.id_prefix                |          |Prefix to EAP-Identity, some AAA servers use a IMSI prefix to select the EAP method|

|charon.plugins.eap-sim.request_identity            |yes       ||

|charon.plugins.eap-tls.fragment_size               |1024      |Maximum size of an EAP-TLS packet|

|charon.plugins.eap-tls.max_message_count           |32        |Maximum number of processed EAP-TLS packets|

|charon.plugins.eap-tnc.fragment_size               |50000     |Maximum size of an EAP-TNC packet|

|charon.plugins.eap-tnc.max_message_count           |2         |Maximum number of processed EAP-TNC packets|

|charon.plugins.eap-ttls.fragment_size              |1024      |Maximum size of an EAP-TTLS packet|

|charon.plugins.eap-ttls.max_message_count          |32        |Maximum number of processed EAP-TTLS packets|

|charon.plugins.eap-ttls.phase2_method              |md5       |Phase2 EAP client authentication method|

|charon.plugins.eap-ttls.phase2_piggyback           |no        |Phase2 EAP Identity request piggybacked by server onto TLS Finished message|

|charon.plugins.eap-ttls.request_peer_auth          |no        |Request peer authentication based on a client certificate|

|charon.plugins.ha.fifo_interface                   |yes       ||

|charon.plugins.ha.local                            |          ||

|charon.plugins.ha.monitor                          |yes       ||

|charon.plugins.ha.remote                           |          ||

|charon.plugins.ha.resync                           |yes       ||

|charon.plugins.ha.secret                           |          ||

|charon.plugins.ha.segment_count                    |1         ||

|charon.plugins.kernel-klips.ipsec_dev_mtu          |0         |Set MTU of ipsecN device|

|charon.plugins.load-tester.enable                  |no        |Enable the load testing plugin. Read [[LoadTests]] first!|

|charon.plugins.load-tester.initiators              |0         |Number of concurrent initiator threads to use in load test|

|charon.plugins.load-tester.iterations              |1         |Number of IKE_SAs to initate to self by each initiator in load test|

|charon.plugins.load-tester.delay                   |0         |Delay between initiatons for each thread|

|charon.plugins.load-tester.proposal                |aes128-sha1-modp1024|IKE proposal to use in load test|

|charon.plugins.load-tester.initiator_auth          |pubkey    |Authentication method(s) the intiator uses|

|charon.plugins.load-tester.responder_auth          |pubkey    |Authentication method(s) the responder uses|

|charon.plugins.load-tester.fake_kernel             |no        |Fake the kernel interface to allow load-testing against self|

|charon.plugins.load-tester.delete_after_established|no        |Delete an IKE_SA as soon as it has been established|

|charon.plugins.load-tester.request_virtual_ip      |no        |Request an INTERNAL_IPV4_ADDR from the server|

|charon.plugins.load-tester.pool                    |NULL      |Provide INTERNAL_IPV4_ADDRs from a named pool|

|charon.plugins.load-tester.remote                  |127.0.0.1 |Address to initiation connections to|

|charon.plugins.load-tester.ike_rekey               |0         |Seconds to start IKE_SA rekeying after setup|

|charon.plugins.load-tester.child_rekey             |600       |Seconds to start CHILD_SA rekeying after setup|

|charon.plugins.resolve.file                        |/etc/resolv.conf|File where to add DNS server entries|

|charon.plugins.sql.database                        |          |Database URI for charons [[SQL]] plugin|

|charon.plugins.sql.loglevel                        |-1        |Loglevel for logging to [[SQL]] database|

|\3. *libstrongswan section*                        |

|libstrongswan.dh_exponent_ansi_x9_42               |yes       |Use ANSI X9.42 DH exponent size or optimum size matched to cryptographical strength| 

|libstrongswan.crypto_test.on_add                   |no        |Test crypto algorithms during registration| 

|libstrongswan.crypto_test.on_create                |no        |Test crypto algorithms on each crypto primitive instantiation|

|libstrongswan.crypto_test.required                 |no        |Strictly require at least one test vector to enable an algorithm|

|libstrongswan.crypto_test.rng_true                 |no        |Whether to test RNG with TRUE quality; requires a lot of entropy|

|libstrongswan.ecp_x_coordinate_only                |yes       |Compliance with the errata for RFC 4753 | 

|libstrongswan.integrity_test                       |no        |Check daemon, libstrongswan and plugin integrity at startup|

|\3. *libstrongswan plugins subsection*             |

|libstrongswan.plugins.attr-sql.database            |          |Database URI for attr-sql plugin used by charon and pluto |

|libstrongswan.plugins.attr-sql.lease_history       |yes       |Enable logging of [[SQL]] IP pool leases|

|libstrongswan.plugins.gcrypt.quick_random          |no        |Use faster random numbers in gcrypt; for testing only, produces weak keys!|

|libstrongswan.plugins.openssl.engine_id            |pkcs11    |ENGINE ID to use in the OpenSSL plugin|

|libstrongswan.plugins.x509.enforce_critical        |no        |Discard certificates with unsupported or unknown critical extensions|

|\3. *libtls section*                               |

|libtls.cipher                                      |          |List of TLS encryption ciphers| 

|libtls.key_exchange                                |          |List of TLS key exchange methods| 

|libtls.mac                                         |          |List of TLS MAC algorithms| 

|libtls.suites                                      |          |List of TLS cipher suites| 

|\3. *manager section*                              |

|manager.database                                   |          |Credential database URI for manager|

|manager.debug                                      |no        |Enable debugging in manager|

|manager.load                                       |          |Plugins to load in manager|

|manager.socket                                     |          |FastCGI socket of manager, to run it statically|

|manager.threads                                    |10        |Threads to use for request handling|

|manager.timeout                                    |15m       |Session timeout for manager|

|\3. *mediation client section*                     |

|medcli.database                                    |          |Mediation client database URI|

|medcli.dpd                                         |5m        |DPD timeout to use in mediation client plugin|

|medcli.rekey                                       |20m       |Rekeying time on mediation connections in mediation client plugin|

|\3. *mediation server section*                     |

|medsrv.database                                    |          |Mediation server database URI|

|medsrv.debug                                       |no        |Debugging in mediation server web application|

|medsrv.dpd                                         |5m        |DPD timeout to use in mediation server plugin|

|medsrv.load                                        |          |Plugins to load in mediation server plugin|

|medsrv.password_length                             |6         |Minimum password length required for mediation server user accounts|

|medsrv.rekey                                       |20m       |Rekeying time on mediation connections in mediation server plugin|

|medsrv.socket                                      |          |Run Mediation server web application statically on socket|

|medsrv.threads                                     |5         |Number of thread for mediation service web application|

|medsrv.timeout                                     |15m       |Session timeout for mediation service|

|\3. *openac section*                               |

|openac.load                                        |          |Plugins to load in ipsec openac tool|

|\3. *pki section*                                 |

|pki.load                                           |          |Plugins to load in ipsec pki tool|

|\3. *pluto section*                                |

|pluto.dns1                                         |          |DNS server 1 assigned to peer via configuration payload (CP)|

|pluto.dns2                                         |          |DNS server 2 assigned to peer via configuration payload (CP)|

|pluto.load                                         |          |Plugins to load in IKEv1 pluto daemon, also see [[PluginLoad]]|

|pluto.nbns1                                        |          |WINS server 1 assigned to peer via configuration payload (CP)|

|pluto.nbns2                                        |          |WINS server 2 assigned to peer via configu+ration payload (CP)|

|\3. *pool section*                                 |

|pool.load                                          |          |Plugins to load in ipsec pool tool|

|\3. *scepclient section*                           |

|scepclient.load                                    |          |Plugins to load in ipsec scepclient tool|

|\3. *starter section*                              |

|starter.load_warning                               |yes       |Disable charon/pluto plugin load option warning|