I2P tunnel configuration ======================== Overview -------- `tunnels.conf` is designed to support multiple I2P tunnels. The configuration file must be located in ``~/.i2pd`` (per-user) or ``/var/lib/i2pd`` (system-wide) on Unix-based systems, and ``%APPDATA%/i2pd`` (per-user) on Windows. This file uses the .ini file format. It consists of multiple sections each with a unique name. Tunnel types ------------ Section type is specified by the *type* parameter. Available tunnel types: Type | Description ------------- | -------------------------------------- client | Client tunnel to remote I2P destination (TCP) server | Generic server tunnel to setup any TCP service in I2P network http | HTTP server tunnel to setup a website in I2P irc | IRC server tunnel to setup IRC server in I2P udpclient | Forwards local UDP endpoint to remote I2P destination udpserver | Forwards traffic from N I2P destinations to local UDP endpoint socks | Custom Socks proxy service to use I2P with httpproxy | Custom HTTP proxy service to use I2P with Signature types ------------ Parameter `signaturetype = ` in a tunnel config. Available signature types: Type | Code | Comment ------------------------------------ | ---- | ----------- DSA-SHA1 | 0 | Deprecated ECDSA-P256 | 1 | *None, actively used* ECDSA-P384 | 2 | *None, actively used* ECDSA-P521 | 3 | *None, actively used* RSA-2048-SHA256 | 4 | Deprecated RSA-3072-SHA384 | 5 | Deprecated RSA-4096-SHA512 | 6 | Deprecated ED25519-SHA512 | 7 | **Default** *ED25519ph-SHA512* | 8 | Not implemented GOSTR3410-A-GOSTR3411-256 | 9 | Not compatible with Java router GOSTR3410-TC26-A-GOSTR3411-512 | 10 | Not compatible with Java router RED25519-SHA512 | 11 | For keys blinding (encrypted LeaseSet) LeaseSet ------------ Available LeaseSet **types** (parameter `i2cp.leaseSetType = ` in a tunnel config): Type | Code | Comment ----------- | ---- | ----------- OLD | 1 | **Default** for server tunnels because encryption type for server is `0` STANDARD | 3 | **Default** for client tunnels because encryption type can be `0` or `4` ENCRYPTED | 5 | Encrypted LeaseSet. Hiding information from floodfill META | 7 | Not implemented *0, 2, 4, 6 types are reserved for routers (RouterInfo types).* Available LeaseSet **encryption** types (parameter `i2cp.leaseSetEncType = ` in a tunnel config): Type | Code | Comment ------------------------------------ | ---- | ----------- ELGAMAL | 0 | **Default** for destinations ECIES_P256_SHA256_AES256CBC | 1 | Not compatible with Java router *ECIES_P384_SHA384_AES256CBC* | 2 | Not implemented *ECIES_P521_SHA512_AES256CBC* | 3 | Not implemented ECIES_X25519_AEAD | 4 | **Default** for routers Client tunnels -------------- Mnemonic: we can connect to someone as client Each client tunnel must contain a few mandatory parameters, along with some optional ones. Here is an example of a client tunnel: ```ini [irc-out] type = client address = 127.0.0.1 port = 6668 destination = irc.ilita.i2p keys = irc.dat ``` If *keys* is empty, transient keys will be created on every restart. If the keys file is not found, new keys will be created and stored into the specified file. If *keys* starts from *transient*, new keys will be created, but not stored into a file. Client tunnels might share the same local destination, if the keys file contains the same identity. Optional parameters: Option | Description --------------------|-------------------- address | local interface tunnel binds to, '127.0.0.1' for connections from local host only, '0.0.0.0' for connections from everywhere. '127.0.0.1' by default signaturetype | signature type for new keys. 0 (DSA), 1 (ECDSA-P256), 7 (EDDSA), 11 (RedDSA). RSA signatures (4,5,6) are not allowed and will be changed to 7. 7 by default cryptotype | crypto type for new keys. Experimental. Should be always 0 destinationport | connect to particular port at destination. 0 by default (targeting first tunnel on server side for destination) keepaliveinterval | send ping to the destination after this interval in seconds. 0 by default meaning no pings So, given the example above, if you connected to 127.0.0.1:6668 on localhost, i2pd would tunnel that connection to irc.ilita.i2p Server/generic tunnels ---------------------- Mnemonic: we serving some service to others in network Here is an example of a server tunnel: ```ini [smtp-in] type = server host = 127.0.0.1 port = 25 keys = smtp-in.dat ``` If *keys* is empty, transient keys will be created on every restart. If the *keys* file is not found, new keys will be created and stored into the specified file. Destination address from *keys* file will be loaded and the LeaseSet of address will be published. The server tunnel must use its own destination such as host 127.0.0.1 and port 80. The *port* is (non-I2P) TCP listening port on IP host that the listening local destination gets connected to. This tunnel type should be used for any protocol other than HTTP, even HTTP with SSL encryption (HTTPS). Optional parameters: Option | Description --------------------|-------------------- inport | (non-TCP non-UDP) I2P local destination port to listen to; an unsigned 16-bit integer. What port at local destination server tunnel listens to. Same as *port* by default accesslist | list of comma-separated of b32 address (without .b32.i2p) allowed to connect. Everybody is allowed by default gzip | turns internal compression off if set to false. true by default signaturetype | means signature type for new keys. 0 - DSA, 1- ECDSA-P256, 7 -EDDSA, 11 -RedDSA. 7 by default cryptotype | crypto type for new keys. Experimental. Should be always 0 enableuniquelocal | if true, connection to local address will look like 127.x.x.x where x.x.x is first 3 bytes of incoming connection peer's ident hash. true by default address | IP address of an interface tunnel is connected to *host* from. Usually not used Server/http tunnels ------------------- *http* tunnels are configured just like regular server tunnels, except the 'Host:' field must be assigned to the address provided in configuration. i2pd will also resolve it if necessary. Here's an example of an http tunnel: ```ini [http-in] type = http host = 127.0.0.1 port = 80 keys = our-website.dat ``` Optional parameters: Option | Description --------------------|-------------------- hostoverride | value to send in 'Host:' header, default: the same as *host* parameter gzip | should we compress contents at I2P level. default: true ssl | use SSL connection to upstream server. `hostoverride` parameter can be used to set SNI domain. default: false (since 2.44.0) Server/IRC tunnels ------------------- IRC tunnels are supposed to connect to an IRC server through WEBIRC. It replaces IP address (usually 127.0.0.1) to user's .b32 I2P address. Optional parameters: Option | Description --------------------|-------------------- webircpassword | password to send with WEBIRC command UDP Tunnels ----------- There are 2 types of UDP tunnels: `udpclient` and `udpserver` `udpclient` forwards 1 local UDP endpoint to 1 remote I2P destination ```ini [openvpn-client-simple] type = udpclient destination = something.b32.i2p port = 1194 ``` Option | Description --------------------|-------------------- destination | the I2P destination of a udpserver tunnel, required parameter address | IP address to bind local UDP endpoint to, defaults to `127.0.0.1` port | port to bind local UDP endpoint to, required parameter gzip | turns internal compression off if set to false. true by default `udpserver` forwards traffic from N I2P destinations to 1 local UDP endpoint ```ini [openvpn-simple-server] type = udpserver keys = openvpn.dat host = 127.0.0.1 port = 1194 ``` Option | Description --------------------|-------------------- address | IP address to use for local UDP endpoints, defaults to `127.0.0.1` host | IP address to forward traffic to, required parameter port | UDP port to forward traffic on, required parameter gzip | turns internal compression off if set to false. true by default Socks proxy ----------- The SOCKS proxy interface can be defined in ``tunnels.conf``. Here's an example of a Socks proxy: ```ini [alt-socks] type = socks address = 127.0.0.1 port = 14447 keys = socks-keys.dat ``` Option | Description --------------------|-------------------- address | local address Socks proxy binds to, defaults to `127.0.0.1` port | TCP port Socks proxy binds to I2CP parameters --------------- These I2CP parameter are common for all tunnel types and specify settings for a local destination. Parameter | Description ------------------------------|-------------------- inbound.length | number of hops of an inbound tunnel. 3 by default, 8 by max; lower value is faster but dangerous outbound.length | number of hops of an outbound tunnel. 3 by default, 8 by max; lower value is faster but dangerous inbound.quantity | number of inbound tunnels. 5 by default, 16 by max outbound.quantity | number of outbound tunnels. 5 by default, 16 by max inbound.lengthVariance | random number of hops to add or subtract to an inbound tunnel between -3 and 3. 0 by default **(since 2.42.0)** outbound.lengthVariance | random number of hops to add or subtract to an outbound tunnel between -3 and 3. 0 by default **(since 2.42.0)** crypto.tagsToSend | number of ElGamal/AES tags to send. 40 by default; too low value may cause problems with tunnel building explicitPeers | list of comma-separated b64 addresses of peers to use, default: unset i2p.streaming.initialAckDelay | milliseconds to wait before sending Ack. 200 by default i2p.streaming.answerPings | enable sending pongs. true by default i2cp.leaseSetType | type of LeaseSet to be sent. 1, 3 or 5. 1 by default i2cp.leaseSetEncType | comma separated encryption types to be used in LeaseSet type 3 or 5. Identity's type by default i2cp.leaseSetPrivKey | decryption key for encrypted LeaseSet in base64. PSK or private DH i2cp.leaseSetAuthType | authentication type for encrypted LeaseSet. 0 - no authentication(default), 1 - DH, 2 - PSK i2cp.leaseSetClient.dh.nnn | client name:client's public DH in base64, for authentication type 1, nnn is integer i2cp.leaseSetClient.psk.nnn | client name:client's PSK in base64, for authentication type 2, nnn is integer Other examples -------------- ```ini # outgoing tunnel sample, to remote service # mandatory parameters: # * type -- always "client" # * port -- local port to listen to # * destination -- I2P hostname # optional parameters (may be omitted) # * keys -- our identity, if unset, will be generated on every startup, # if set and file missing, keys will be generated and placed to this file # * address -- local interface to bind # * signaturetype -- signature type for new destination. 0 (DSA/SHA1), 1 (EcDSA/SHA256) or 7 (EdDSA/SHA512) [IRC] type = client address = 127.0.0.1 port = 6668 destination = irc.ilita.i2p keys = irc-keys.dat # # incoming tunnel sample, for local service # mandatory parameters: # * type -- "server" or "http" # * host -- IP address of our service # * port -- port of our service # * keys -- file with LeaseSet of address in i2p # optional parameters (may be omitted) # * inport -- optional, I2P service port, if unset - the same as 'port' # * accesslist -- comma-separated list of I2P addresses, allowed to connect # every address is b32 without '.b32.i2p' part [LOCALSITE] type = http host = 127.0.0.1 port = 80 keys = site-keys.dat # [IRC-SERVER] type = server host = 127.0.0.1 port = 6667 keys = irc.dat ```