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mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret
author Kim Alvefur <zash@zash.se>
date Fri, 03 Mar 2023 21:14:19 +0100
parents f8ecb4b248b0
children bf5370a40a15
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[Unit]
### see man systemd.unit
Description=Prosody XMPP Server
Documentation=https://prosody.im/doc

[Service]
### See man systemd.service ###
# With this configuration, systemd takes care of daemonization
# so Prosody should be configured with daemonize = false
Type=simple

# Not sure if this is needed for 'simple'
PIDFile=/var/run/prosody/prosody.pid

# Start by executing the main executable
ExecStart=/usr/bin/prosody

ExecReload=/bin/kill -HUP $MAINPID

# Restart on crashes
Restart=on-abnormal

# Set O_NONBLOCK flag on sockets passed via socket activation
NonBlocking=true

### See man systemd.exec ###

WorkingDirectory=/var/lib/prosody

User=prosody
Group=prosody

Umask=0027

# Nice=0

# Set stdin to /dev/null since Prosody does not need it
StandardInput=null

# Direct stdout/-err to journald for use with log = "*stdout"
StandardOutput=journal
StandardError=inherit

# This usually defaults to 4k or so
# LimitNOFILE=1M

## Interesting protection methods
# Finding a useful combo of these settings would be nice
#
# Needs read access to /etc/prosody for config
# Needs write access to /var/lib/prosody for storing data (for internal storage)
# Needs write access to /var/log/prosody for writing logs (depending on config)
# Needs read access to code and libraries loaded

# ReadWriteDirectories=/var/lib/prosody /var/log/prosody
# InaccessibleDirectories=/boot /home /media /mnt /root /srv
# ReadOnlyDirectories=/usr /etc/prosody

# PrivateTmp=true
# PrivateDevices=true
# PrivateNetwork=false

# ProtectSystem=full
# ProtectHome=true
# ProtectKernelTunables=true
# ProtectControlGroups=true
# SystemCallFilter=

# This should break LuaJIT
# MemoryDenyWriteExecute=true