diff --git a/chat/consumers.py b/chat/consumers.py
index 7af3987..75afd75 100644
--- a/chat/consumers.py
+++ b/chat/consumers.py
@@ -2,8 +2,11 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from channels.generic.websocket import AsyncJsonWebsocketConsumer
+from django.contrib.auth.models import User
 from registration.models import Registration
 
+from .models import Channel
+
 
 class ChatConsumer(AsyncJsonWebsocketConsumer):
     """
@@ -15,6 +18,8 @@ class ChatConsumer(AsyncJsonWebsocketConsumer):
         We accept only if this is a user of a team of the associated tournament, or a volunteer
         of the tournament.
         """
+        if '_fake_user_id' in self.scope['session']:
+            self.scope['user'] = await User.objects.aget(pk=self.scope['session']['_fake_user_id'])
 
         # Fetch the registration of the current user
         user = self.scope['user']
@@ -43,4 +48,28 @@ class ChatConsumer(AsyncJsonWebsocketConsumer):
         Called when the client sends us some data, parsed as JSON.
         :param content: The sent data, decoded from JSON text. Must content a `type` field.
         """
-        # TODO Process chat protocol
+        match content['type']:
+            case 'fetch_channels':
+                await self.fetch_channels()
+            case unknown:
+                print("Unknown message type:", unknown)
+
+    async def fetch_channels(self) -> None:
+        user = self.scope['user']
+
+        read_channels = await Channel.get_accessible_channels(user, 'read')
+        write_channels = await Channel.get_accessible_channels(user, 'write')
+        print([channel async for channel in write_channels.all()])
+        message = {
+            'type': 'fetch_channels',
+            'channels': [
+                {
+                    'id': channel.id,
+                    'name': channel.name,
+                    'read_access': True,
+                    'write_access': await write_channels.acontains(channel),
+                }
+                async for channel in read_channels.all()
+            ]
+        }
+        await self.send_json(message)
diff --git a/chat/models.py b/chat/models.py
index 66e0f93..0e4b078 100644
--- a/chat/models.py
+++ b/chat/models.py
@@ -1,9 +1,13 @@
 # Copyright (C) 2024 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.contrib.auth.models import User
 from django.db import models
+from django.db.models import Q, QuerySet
 from django.utils.text import format_lazy
 from django.utils.translation import gettext_lazy as _
+from participation.models import Tournament
+from registration.models import ParticipantRegistration, Registration, VolunteerRegistration
 from tfjm.permissions import PermissionType
 
 
@@ -74,7 +78,73 @@ class Channel(models.Model):
     )
 
     def __str__(self):
-        return format_lazy(_("Channel {name}"), name=self.name)
+        return str(format_lazy(_("Channel {name}"), name=self.name))
+
+    @staticmethod
+    async def get_accessible_channels(user: User, permission_type: str = 'read') -> QuerySet["Channel"]:
+        permission_type = 'write_access' if 'write' in permission_type.lower() else 'read_access'
+
+        qs = Channel.objects.none()
+        if user.is_anonymous:
+            return Channel.objects.filter(**{permission_type: PermissionType.ANONYMOUS})
+
+        qs |= Channel.objects.filter(**{permission_type: PermissionType.AUTHENTICATED})
+        registration = await Registration.objects.aget(user_id=user.id)
+
+        if registration.is_admin:
+            return Channel.objects.all()
+
+        if registration.is_volunteer:
+            registration = await VolunteerRegistration.objects \
+                .prefetch_related('jury_in__tournament', 'organized_tournaments').aget(user_id=user.id)
+
+            qs |= Channel.objects.filter(**{permission_type: PermissionType.VOLUNTEER})
+
+            qs |= Channel.objects.filter(Q(tournament__in=registration.interesting_tournaments),
+                                         **{permission_type: PermissionType.TOURNAMENT_MEMBER})
+
+            qs |= Channel.objects.filter(Q(tournament__in=registration.organized_tournaments.all()),
+                                         **{permission_type: PermissionType.TOURNAMENT_ORGANIZER})
+
+            qs |= Channel.objects.filter(Q(tournament__pools__in=registration.pools_presided.all())
+                                         | Q(tournament__in=registration.organized_tournaments.all()),
+                                         **{permission_type: PermissionType.TOURNAMENT_JURY_PRESIDENT})
+
+            qs |= Channel.objects.filter(Q(pool__in=registration.jury_in.all())
+                                         | Q(pool__tournament__in=registration.organized_tournaments.all())
+                                         | Q(pool__tournament__pools__in=registration.pools_presided.all()),
+                                         **{permission_type: PermissionType.JURY_MEMBER})
+
+            qs |= Channel.objects.filter(Q(pool__in=registration.jury_in.all())
+                                         | Q(pool__tournament__in=registration.organized_tournaments.all())
+                                         | Q(pool__tournament__pools__in=registration.pools_presided.all()),
+                                         **{permission_type: PermissionType.POOL_MEMBER})
+        else:
+            registration = await ParticipantRegistration.objects \
+                .prefetch_related('team__participation__pools', 'team__participation__tournament').aget(user_id=user.id)
+
+            team = registration.team
+            tournaments = []
+            if team.participation.valid:
+                tournaments.append(team.participation.tournament)
+            if team.participation.final:
+                tournaments.append(await Tournament.objects.aget(final=True))
+
+            qs |= Channel.objects.filter(Q(tournament__in=tournaments),
+                                         **{permission_type: PermissionType.TOURNAMENT_MEMBER})
+
+            qs |= Channel.objects.filter(Q(pool__in=team.participation.pools.all()),
+                                         **{permission_type: PermissionType.POOL_MEMBER})
+
+            qs |= Channel.objects.filter(Q(team=team),
+                                         **{permission_type: PermissionType.TEAM_MEMBER})
+
+        qs |= Channel.objects.filter(invited=user)
+
+        print(user)
+        print(qs.query)
+
+        return qs
 
     class Meta:
         verbose_name = _("channel")
diff --git a/chat/static/chat.js b/chat/static/chat.js
index 5a45a83..8d5063a 100644
--- a/chat/static/chat.js
+++ b/chat/static/chat.js
@@ -25,6 +25,7 @@ document.addEventListener('DOMContentLoaded', () => {
      */
     function processMessage(data) {
         // TODO Implement chat protocol
+        console.log(data)
     }
 
     function setupSocket(nextDelay = 1000) {
@@ -46,6 +47,12 @@ document.addEventListener('DOMContentLoaded', () => {
             console.error('Chat socket closed unexpectedly, restarting…')
             setTimeout(() => setupSocket(2 * nextDelay), nextDelay)
         })
+
+        socket.addEventListener('open', e => {
+            socket.send(JSON.stringify({
+                'type': 'fetch_channels',
+            }))
+        })
     }
 
     setupSocket()