Include friendchecker
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Nico Schottelius
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README.md
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README.md
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@ -10,3 +10,140 @@ know when they are online. Let's solve this problem once-and-for-all
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in a decentralised, sustainable and future proof way.
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## Here come's the real IPv6 friend
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Instead of using a single system or server, we use IPv6 to connect to
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our friends directly. Because each of our friends is reachable by IPv6
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if they are online (otherwise they would not be a real IPv6 friend),
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we can easily verify if they are online. To find out who is online,
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just connect to their computer!
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## How it works
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It's a bit geeky, but it works actually rather simple.
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To become a real IPv6 friend, you need to do the following things:
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- Generate a GPG key with a comment named RIF following the URL of
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your computer
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- Ensure that the URL points to the IPv6 address of your computer
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- Setup a webserver on your computer
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- Export your key and all real IPv6 friend keys to your webserver as
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"rifkeys.txt
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- For each of your friends, check whether they are online!
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### Example: Generating a key with the right comment
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In this example I choose to create an ECC based key that requires the
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export option in gpg:
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```
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[1:24] line:~% gpg --expert --full-gen-key
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gpg (GnuPG) 2.2.12; Copyright (C) 2018 Free Software Foundation, Inc.
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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Please select what kind of key you want:
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(1) RSA and RSA (default)
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(2) DSA and Elgamal
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(3) DSA (sign only)
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(4) RSA (sign only)
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(7) DSA (set your own capabilities)
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(8) RSA (set your own capabilities)
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(9) ECC and ECC
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(10) ECC (sign only)
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(11) ECC (set your own capabilities)
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(13) Existing key
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Your selection? 9
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Please select which elliptic curve you want:
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(1) Curve 25519
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(3) NIST P-256
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(4) NIST P-384
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(5) NIST P-521
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(6) Brainpool P-256
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(7) Brainpool P-384
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(8) Brainpool P-512
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(9) secp256k1
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Your selection? 1
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Please specify how long the key should be valid.
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0 = key does not expire
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<n> = key expires in n days
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<n>w = key expires in n weeks
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<n>m = key expires in n months
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<n>y = key expires in n years
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Key is valid for? (0) 0
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Key does not expire at all
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Is this correct? (y/N) y
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GnuPG needs to construct a user ID to identify your key.
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Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? c
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Comment: RIF https://nico.ungleich.cloud
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You selected this USER-ID:
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"Nico Schottelius (RIF https://nico.ungleich.cloud) <ipv6@nico.ungleich.cloud>"
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Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o
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We need to generate a lot of random bytes. It is a good idea to perform
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some other action (type on the keyboard, move the mouse, utilize the
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disks) during the prime generation; this gives the random number
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generator a better chance to gain enough entropy.
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We need to generate a lot of random bytes. It is a good idea to perform
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some other action (type on the keyboard, move the mouse, utilize the
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disks) during the prime generation; this gives the random number
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generator a better chance to gain enough entropy.
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gpg: key 27541E11E73F288D marked as ultimately trusted
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gpg: directory '/home/nico/.gnupg/openpgp-revocs.d' created
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gpg: revocation certificate stored as '/home/nico/.gnupg/openpgp-revocs.d/B982A8BABC030C66DEF5984527541E11E73F288D.rev'
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public and secret key created and signed.
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pub ed25519 2019-09-09 [SC]
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B982A8BABC030C66DEF5984527541E11E73F288D
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uid Nico Schottelius (RIF https://nico.ungleich.cloud) <ipv6@nico.ungleich.cloud>
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sub cv25519 2019-09-09 [E]
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```
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### Example: Setting up a webserver
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On a Debian/Devuan based distro:
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```
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apt install nginx
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sudo chown $(whoami) /var/www/html
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```
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### Exporting all keys
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To make yourself accessible and expose who your real IPv6 friends are.
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```
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gpg -a --export RIF > /var/www/html/rifkeys
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```
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### Example: List your friends
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```
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[1:40] line:~% gpg --list-keys --with-colons | grep RIF | awk -F: '{ print $10 }' | sed 's/\\x3a/:/'
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Nico Schottelius (RIF https://nico.ungleich.cloud) <ipv6@nico.ungleich.cloud>
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Nico Schottelius (myself) (RIF https://nico2.ungleich.cloud) <nico@nico.ungleich.cloud>
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```
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### Example: Checking which friends are online
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Use the included rif-checkfriends.sh script or iterate yourself over
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above output.
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```
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```
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## To be added
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- advanced usage -> ipv6 email
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### CLI ideas
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- **rif prepare**: check webserver, keyring, etc.
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- **rif online**: check who is online
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@ -0,0 +1,14 @@
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#!/bin/sh
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# 2019-09-10, Nico Schottelius, Seoul
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gpg --list-keys --with-colons | grep RIF | awk -F: '{ print $10 }' | sed 's/\\x3a/:/' | (
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while read line
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do name=$(echo $line | sed 's/\(.*\)(.*/\1/')
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# Assume by default offline
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online=offline
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url=$(echo $line | sed -e 's/.*(RIF //' -e 's/).*//')
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echo "Checking $name on $url ..."
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curl -s "$url" > /dev/null && online=online
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echo $name is $online
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done
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)
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