188 lines
No EOL
7.5 KiB
Markdown
188 lines
No EOL
7.5 KiB
Markdown
# MultiSchleuder
|
|
|
|
[](https://gitlab.com/s3lph/multischleuder/-/commits/main)
|
|
[](https://gitlab.com/s3lph/multischleuder/-/commits/main)
|
|
[](https://gitlab.com/s3lph/multischleuder/-/releases)
|
|
[](https://gitlab.com/s3lph/multischleuder/-/blob/main/LICENSE)
|
|
|
|
Automatically and periodically merge subscribers and keys of multiple [Schleuder][schleuder] lists into one.
|
|
|
|
## Dependencies
|
|
|
|
* **python-dateutil**, because where would we be without it?
|
|
* **PGPy**: For sending encrypted messages
|
|
* **PyYAML**: For parsing the config file
|
|
|
|
## Installation
|
|
|
|
You can find Debian packages and Python wheels over at [Releases][releases].
|
|
|
|
## Configuration
|
|
|
|
In the Debian package, the config file lives at `/etc/multischleuder/multischleuder.yml`
|
|
|
|
```yaml
|
|
---
|
|
|
|
# Configure this to talk to your schleuder-api-daemon.
|
|
api:
|
|
url: "https://localhost:4443"
|
|
token: "130a8c095d14fa51e73727e9d8ef5db3a3bf0cae7d995c1f"
|
|
cafile: /etc/multischleuder/schleuder-ca.pem
|
|
|
|
lists:
|
|
|
|
# The Schleuder list to manage. Must exist
|
|
- target: global@schleuder.example.org
|
|
unmanaged:
|
|
# Adresses to ignore everywhere. Usually you want to
|
|
# put the admins of your target Schleuder here, in order
|
|
# to prevent them from becoming unsubscribed.
|
|
- admin@example.org
|
|
banned:
|
|
# If for some reason, you need to ban a subscriber from the
|
|
# target list only, put them here
|
|
- banned@example.org
|
|
sources:
|
|
# The Schleuder lists to take subscribers and keys from.
|
|
# They must already exist.
|
|
- east@schleuder.example.org
|
|
- west@schleuder.example.org
|
|
- north@schleuder.example.org
|
|
- south@schleuder.example.org
|
|
# When sending mails, use this as the sender address. If absent,
|
|
# the -owner address is used.
|
|
from: global-owner@schleuder.example.org
|
|
# Whether to notify subscribers of key or email address conflicts.
|
|
send_conflict_messages: yes
|
|
# Whether to notify the target Schleuder's admins about changes.
|
|
send_admin_reports: yes
|
|
|
|
# Hook this up to your MTA,
|
|
smtp:
|
|
hostname: localhost # default: localhost
|
|
port: 10025 # default: 25
|
|
tls: PLAIN # PLAIN|STARTTLS|SMTPS; default: PLAIN
|
|
username: admin # optional
|
|
password: password # optional
|
|
|
|
conflict:
|
|
# How often to notify users about conflicts
|
|
interval: 604800 # 1 week
|
|
# The file where Schleuder memorizes when it has last sent messages for
|
|
# which conflicts
|
|
statefile: /var/lib/multischleuder/conflict.json
|
|
# The template used when sending mails to a subscriber involved in a key conflict
|
|
# (multiple keys used by the same subscriber). You can use the following fields:
|
|
# {subscriber}: Email address of the affected subscriber
|
|
# {schleuder}: Name (email) of the target Schleuder
|
|
# {chosen}: The key that was chosen to subscribe to the target Schleuder
|
|
# {affected}: A list of "fingerprint: source schleuder" candidates involved
|
|
# in the conflict.
|
|
key_template: |
|
|
Hi {subscriber},
|
|
|
|
While compiling the subscriber list of {schleuder}, your
|
|
address {subscriber} was subscribed on multiple sub-lists with
|
|
different PGP keys. There may be something fishy or malicious going on,
|
|
or this may simply have been a mistake by you or a list admin.
|
|
|
|
You have only been subscribed to {schleuder} using the key you
|
|
have been subscribed with for the *longest* time:
|
|
|
|
{chosen}
|
|
|
|
Please review the following keys and talk to the admins of the
|
|
corresponding sub-lists to resolve this issue:
|
|
|
|
Fingerprint Sub-List
|
|
----------- --------
|
|
{affected}
|
|
|
|
For your convenience, this message has been encrypted with *all* of the
|
|
above keys. If you have any questions, or do not understand this
|
|
message, please refer to your local Schleuder admin, or reply to this
|
|
message.
|
|
|
|
Regards
|
|
MultiSchleuder {schleuder}
|
|
# The template used when sending mails to subscribers involved in a user conflict
|
|
# (multiple subscribers using the same key). You can use the following fields:
|
|
# {subscriber}: Email address of the subscriber addressed in this email
|
|
# {fingerprint}: Fingerprint of the key used multiple times
|
|
# {schleuder}: Name (email) of the target Schleuder
|
|
# {chosen}: The email that was chosen to subscribe to the target Schleuder
|
|
# {affected}: A list of "email address: source schleuder" candidates involved
|
|
# in the conflict.
|
|
user_template: |
|
|
Hi {subscriber},
|
|
|
|
While compiling the subscriber list of {schleuder}, your
|
|
key {fingerprint} was used by subscribers on multiple sub-lists with
|
|
different email adresses. There may be something fishy or malicious
|
|
going on, or this may simply have been a mistake by you or a list admin.
|
|
|
|
You have only been subscribed to {schleuder} using the address you
|
|
have been subscribed with for the *longest* time:
|
|
|
|
{chosen}
|
|
|
|
Please review the following adresses and talk to the admins of the
|
|
corresponding sub-lists to resolve this issue:
|
|
|
|
Adress Sub-List
|
|
------ --------
|
|
{affected}
|
|
|
|
For your convenience, this message has been sent to *all* of the above
|
|
adresses. If you have any questions, or do not understand this
|
|
message, please refer to your local Schleuder admin, or reply to this
|
|
message.
|
|
|
|
Regards
|
|
MultiSchleuder {schleuder}
|
|
|
|
```
|
|
|
|
## Usage
|
|
|
|
```
|
|
multischleuder --config path/to/multischleuder.yml
|
|
```
|
|
|
|
Multischleuder also comes with a **dry-run mode**:
|
|
|
|
```
|
|
multischleuder --config path/to/multischleuder.yml --dry-run
|
|
```
|
|
|
|
And to increase the log level:
|
|
|
|
```
|
|
multischleuder --config path/to/multischleuder.yml --verbose
|
|
```
|
|
|
|
|
|
## Conflict Resolution
|
|
|
|
Schleuder is quite restrictive when it comes to mapping subscriptions to keys and vice versa:
|
|
|
|
- A key (identified by its fingerprint) can only be used by one subscriber, even if the key has multiple uids.
|
|
- A subscriber can only be subscribed using a single key, even if multiple keys with the same uid are in the keyring.
|
|
|
|
This can lead to conflicts when merging multiple lists, because these properties don't necessarily hold up for the union of all sublist subscribers and keys.
|
|
|
|
MultiSchleuder resolves conflicts in a simple, but primitive manner:
|
|
|
|
1. First it checks whether two or more subscribers are using the same key. If so, the oldest subscription wins, the other subscribers are not subscribed to the target list.
|
|
1. Then it checks whether a subscriber has more than one key. If so, the key used by the oldest subscription wins.
|
|
|
|
This is by no means a perfect solution.
|
|
It does however yield consisitent results.
|
|
In both cases, if configured to do so, MultiSchleuder will send a notification message to all subscribers involved in a conflict, encrypting it with all keys involved in the conflict.
|
|
If one or more keys are - for whatever reason - unusable, the message will not be encrypted.
|
|
This is a deliberate decision, since the amount of metadata possibly leaked from such a message is fairly small, and we consider it worth taking this risk, given that the other possibilty would be to not notify a subscriber when something potentially malicious is going on.
|
|
|
|
|
|
[schleuder]: https://schleuder.org/
|
|
[releases]: https://gitlab.com/s3lph/multischleuder/-/releases |