Hello! Are you a real IPv6 friend? ## Introduction People like you and me don't want or need Facebook. However, we do want to securely communicate with our friends. And chat with them. And know when they are online. Let's solve this problem once-and-for-all in a decentralised, sustainable and future proof way. ## Here come's the real IPv6 friend Instead of using a single system or server, we use IPv6 to connect to our friends directly. Because each of our friends is reachable by IPv6 if they are online (otherwise they would not be a real IPv6 friend), we can easily verify if they are online. To find out who is online, just connect to their computer! ## How it works It's a bit geeky, but it works actually rather simple. To become a real IPv6 friend, you need to do the following things: - Generate a GPG key with a comment named RIF following the URL of your computer - Ensure that the URL points to the IPv6 address of your computer - Setup a webserver on your computer - Export your key and all real IPv6 friend keys to your webserver as "rifkeys.txt - For each of your friends, check whether they are online - Import the friends of your friends and check whether they are online, too! ### Example: Generating a key with the right comment In this example I choose to create an ECC based key that requires the export option in gpg: ``` [1:24] line:~% gpg --expert --full-gen-key gpg (GnuPG) 2.2.12; Copyright (C) 2018 Free Software Foundation, Inc. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) (7) DSA (set your own capabilities) (8) RSA (set your own capabilities) (9) ECC and ECC (10) ECC (sign only) (11) ECC (set your own capabilities) (13) Existing key Your selection? 9 Please select which elliptic curve you want: (1) Curve 25519 (3) NIST P-256 (4) NIST P-384 (5) NIST P-521 (6) Brainpool P-256 (7) Brainpool P-384 (8) Brainpool P-512 (9) secp256k1 Your selection? 1 Please specify how long the key should be valid. 0 = key does not expire = key expires in n days w = key expires in n weeks m = key expires in n months y = key expires in n years Key is valid for? (0) 0 Key does not expire at all Is this correct? (y/N) y GnuPG needs to construct a user ID to identify your key. Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? c Comment: RIF https://nico.ungleich.cloud You selected this USER-ID: "Nico Schottelius (RIF https://nico.ungleich.cloud) " Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o We need to generate a lot of random bytes. It is a good idea to perform some other action (type on the keyboard, move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. We need to generate a lot of random bytes. It is a good idea to perform some other action (type on the keyboard, move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: key 27541E11E73F288D marked as ultimately trusted gpg: directory '/home/nico/.gnupg/openpgp-revocs.d' created gpg: revocation certificate stored as '/home/nico/.gnupg/openpgp-revocs.d/B982A8BABC030C66DEF5984527541E11E73F288D.rev' public and secret key created and signed. pub ed25519 2019-09-09 [SC] B982A8BABC030C66DEF5984527541E11E73F288D uid Nico Schottelius (RIF https://nico.ungleich.cloud) sub cv25519 2019-09-09 [E] ``` ### Example: Setting up a webserver On a Debian/Devuan based distro: ``` apt install nginx sudo chown $(whoami) /var/www/html ``` ### Exporting all keys To make yourself accessible and expose who your real IPv6 friends are. ``` gpg -a --export RIF > /var/www/html/rifkeys ``` ### Example: List your friends You can use the included rif-listfriends.sh or directly gpg: ``` [1:40] line:~% gpg --list-keys --with-colons | grep RIF | awk -F: '{ print $10 }' | sed 's/\\x3a/:/' Nico Schottelius (RIF https://nico.ungleich.cloud) Nico Schottelius (myself) (RIF https://nico2.ungleich.cloud) ``` ### Example: Checking which friends are online Use the included rif-checkfriends.sh script or iterate yourself over above output. ``` [1:54] line:realipv6friend% sh rif-checkfriends.sh Checking Nico Schottelius on https://nico.ungleich.cloud ... Nico Schottelius is online Checking Nico Schottelius (myself) on https://nico2.ungleich.cloud ... Nico Schottelius (myself) is offline [1:54] line:realipv6friend% ``` ### Example: Importing friends of my friend Importing friends of a friend is as simple as importing all the exported keys! We import friends directly from the URL of a friend: ``` curl -6 -s https://nico.ungleich.cloud/rifkeys | gpg --import ``` You can also use ### Example: Sending a message to a friend Simply use your mail program for that. And obviously enable signing & encrypting the email. ## To be added - advanced usage -> ipv6 email ### CLI ideas - **rif prepare**: check webserver, keyring, etc. - **rif online**: check who is online