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fix: cross-cell routing for split-tunnel peers

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Three related fixes for split-tunnel peers that need to reach connected cells:

1. apply_peer_rules/apply_all_peer_rules now accept wg_subnet (actual local VPN
   subnet) and cell_subnets (connected cells' vpn_subnets) parameters instead of
   hardcoding 10.0.0.0/24. All callers (startup, add_peer, update_peer,
   apply-enforcement endpoint) pass the real values.

2. Explicit ACCEPT rules are inserted in FORWARD for each connected cell's
   subnet so split-tunnel peers (internet_access=False) can still reach
   connected cells via the wg0→wg0 path.

3. apply_ip_range in network_manager now loads cell_links.json and passes it
   to generate_corefile(), fixing a race where the bootstrap DNS thread could
   overwrite the Corefile and wipe cross-cell DNS forwarding zones on startup.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Dmitrii Iurco
2026-05-04 14:36:28 -04:00
parent 8ee1d88e37
commit c2d215ee2e
6 changed files with 171 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
api/app.py
+8 -1
View File
@@ -308,7 +308,14 @@ def _apply_startup_enforcement():
peers = peer_registry.list_peers()
cell_links = cell_link_manager.list_connections()
firewall_manager.reconcile_stale_peer_rules(peers)
firewall_manager.apply_all_peer_rules(peers)
import ipaddress as _ipa
try:
_wg_addr = wireguard_manager._get_configured_address()
_wg_subnet = str(_ipa.ip_network(_wg_addr, strict=False)) if _wg_addr else '10.0.0.0/24'
except Exception:
_wg_subnet = '10.0.0.0/24'
_cell_subnets = [l['vpn_subnet'] for l in cell_links if l.get('vpn_subnet')]
firewall_manager.apply_all_peer_rules(peers, wg_subnet=_wg_subnet, cell_subnets=_cell_subnets)
firewall_manager.apply_all_cell_rules(cell_links)
firewall_manager.ensure_cell_api_dnat()
# Embed DNAT rules in PostUp so they survive WireGuard interface restarts,
api/firewall_manager.py
+29 -10
View File
@@ -153,18 +153,27 @@ def clear_peer_rules(peer_ip: str) -> None:
logger.error(f"clear_peer_rules({peer_ip}): {e}")
def apply_peer_rules(peer_ip: str, settings: Dict[str, Any]) -> bool:
def apply_peer_rules(peer_ip: str, settings: Dict[str, Any],
wg_subnet: str = '10.0.0.0/24',
cell_subnets: Optional[List[str]] = None) -> bool:
"""
Apply iptables FORWARD rules for a peer based on their access settings.
wg_subnet: the local cell's WireGuard VPN subnet (e.g. '10.0.2.0/24').
Used for the peer-to-peer ACCEPT/DROP rule. Defaults to the
legacy hardcoded value so callers that don't yet pass it are safe.
cell_subnets: list of connected cells' vpn_subnet strings. When provided,
explicit ACCEPT rules are added so split-tunnel peers can reach
connected cells regardless of the internet_access setting.
Each rule is inserted at position 1 (-I), so the LAST call ends up at the TOP.
We insert in reverse-priority order: lowest-priority rules first, highest last.
Desired final chain order (top = highest priority):
1. Per-service DROP/ACCEPT (most specific — must beat private-net ACCEPT)
2. Peer-to-peer ACCEPT/DROP (10.0.0.0/24)
3. Private-net ACCEPTs (for no-internet peers to reach local resources)
4. Internet DROP or ACCEPT (lowest priority catch-all)
1. Connected-cell subnet ACCEPTs (explicit cross-cell routing)
2. Peer-to-peer ACCEPT/DROP (local VPN subnet)
3. Private-net ACCEPTs (for no-internet peers to reach local resources)
4. Internet DROP or ACCEPT (lowest priority catch-all)
"""
try:
comment = _peer_comment(peer_ip)
@@ -187,24 +196,34 @@ def apply_peer_rules(peer_ip: str, settings: Dict[str, Any]) -> bool:
_iptables(['-I', 'FORWARD', '-s', peer_ip, '-d', net,
'-m', 'comment', '--comment', comment, '-j', 'ACCEPT'])
# --- Step 2 --- Peer-to-peer (10.0.0.0/24)
# --- Step 2 --- Peer-to-peer: use the actual local VPN subnet
target = 'ACCEPT' if peer_access else 'DROP'
_iptables(['-I', 'FORWARD', '-s', peer_ip, '-d', '10.0.0.0/24',
_iptables(['-I', 'FORWARD', '-s', peer_ip, '-d', wg_subnet,
'-m', 'comment', '--comment', comment, '-j', target])
# --- Step 3 --- Explicit ACCEPT for each connected cell's subnet so
# split-tunnel peers can route to connected cells (wg0 → wg0 forwarding).
if cell_subnets:
for subnet in reversed(cell_subnets):
_iptables(['-I', 'FORWARD', '-s', peer_ip, '-d', subnet,
'-m', 'comment', '--comment', comment, '-j', 'ACCEPT'])
# Service access restriction is done entirely by CoreDNS ACL.
# No per-peer iptables rule for Caddy:80 — blocking it would also
# prevent the peer from reaching the PIC web UI and API.
logger.info(f"Applied rules for {peer_ip}: internet={internet_access} "
f"services={service_access} peers={peer_access}")
f"services={service_access} peers={peer_access} "
f"wg_subnet={wg_subnet} cell_subnets={cell_subnets}")
return True
except Exception as e:
logger.error(f"apply_peer_rules({peer_ip}): {e}")
return False
def apply_all_peer_rules(peers: List[Dict[str, Any]]) -> None:
def apply_all_peer_rules(peers: List[Dict[str, Any]],
wg_subnet: str = '10.0.0.0/24',
cell_subnets: Optional[List[str]] = None) -> None:
"""Re-apply rules for all peers (called on startup)."""
ensure_caddy_virtual_ips()
for peer in peers:
@@ -215,7 +234,7 @@ def apply_all_peer_rules(peers: List[Dict[str, Any]]) -> None:
'internet_access': peer.get('internet_access', True),
'service_access': peer.get('service_access', list(SERVICE_IPS.keys())),
'peer_access': peer.get('peer_access', True),
})
}, wg_subnet=wg_subnet, cell_subnets=cell_subnets)
def reconcile_stale_peer_rules(peers: List[Dict[str, Any]]) -> int:
api/network_manager.py
+9 -2
View File
@@ -460,7 +460,8 @@ class NetworkManager(BaseServiceManager):
except Exception as e:
warnings.append(f"dnsmasq domain update failed: {e}")
# 2. Regenerate Corefile using generate_corefile so it always stays consistent
# 2. Regenerate Corefile — include cell-to-cell forwarding stanzas so a
# domain/ip_range change doesn't wipe cross-cell DNS forwarding zones.
try:
import firewall_manager as _fm
corefile = os.path.join(self.config_dir, 'dns', 'Corefile')
@@ -470,7 +471,13 @@ class NetworkManager(BaseServiceManager):
peers = _json.loads(open(peers_file).read()) if os.path.exists(peers_file) else []
except Exception:
peers = []
_fm.generate_corefile(peers, corefile, domain)
cell_links_file = os.path.join(self.data_dir, 'cell_links.json')
try:
import json as _json2
cell_links = _json2.loads(open(cell_links_file).read()) if os.path.exists(cell_links_file) else []
except Exception:
cell_links = []
_fm.generate_corefile(peers, corefile, domain, cell_links=cell_links)
except Exception as e:
warnings.append(f"Corefile domain update failed: {e}")
api/routes/peers.py
+20 -3
View File
@@ -38,6 +38,13 @@ def add_peer():
from app import (peer_registry, wireguard_manager, firewall_manager,
email_manager, calendar_manager, file_manager, auth_manager,
cell_link_manager, _configured_domain, COREFILE_PATH)
try:
_wg_addr = wireguard_manager._get_configured_address()
_wg_subnet = str(ipaddress.ip_network(_wg_addr, strict=False)) if _wg_addr else '10.0.0.0/24'
except Exception:
_wg_subnet = '10.0.0.0/24'
_cell_links = cell_link_manager.list_connections()
_cell_subnets = [l['vpn_subnet'] for l in _cell_links if l.get('vpn_subnet')]
data = request.get_json(silent=True)
if data is None:
return jsonify({"error": "No data provided"}), 400
@@ -118,7 +125,8 @@ def add_peer():
return jsonify({"error": f"Peer {peer_name} already exists"}), 400
peer_added_to_registry = True
firewall_manager.apply_peer_rules(peer_info['ip'], peer_info)
firewall_manager.apply_peer_rules(peer_info['ip'], peer_info,
wg_subnet=_wg_subnet, cell_subnets=_cell_subnets)
firewall_applied = True
wg_allowed = f"{assigned_ip}/32" if '/' not in assigned_ip else assigned_ip
@@ -153,7 +161,15 @@ def add_peer():
@bp.route('/api/peers/<peer_name>', methods=['PUT'])
def update_peer(peer_name):
try:
from app import peer_registry, firewall_manager, cell_link_manager, _configured_domain, COREFILE_PATH
from app import (peer_registry, wireguard_manager, firewall_manager,
cell_link_manager, _configured_domain, COREFILE_PATH)
try:
_wg_addr = wireguard_manager._get_configured_address()
_wg_subnet = str(ipaddress.ip_network(_wg_addr, strict=False)) if _wg_addr else '10.0.0.0/24'
except Exception:
_wg_subnet = '10.0.0.0/24'
_cell_links = cell_link_manager.list_connections()
_cell_subnets = [l['vpn_subnet'] for l in _cell_links if l.get('vpn_subnet')]
data = request.get_json(silent=True) or {}
existing = peer_registry.get_peer(peer_name)
if not existing:
@@ -173,7 +189,8 @@ def update_peer(peer_name):
if success:
updated_peer = peer_registry.get_peer(peer_name)
if updated_peer:
firewall_manager.apply_peer_rules(updated_peer['ip'], updated_peer)
firewall_manager.apply_peer_rules(updated_peer['ip'], updated_peer,
wg_subnet=_wg_subnet, cell_subnets=_cell_subnets)
firewall_manager.apply_all_dns_rules(peer_registry.list_peers(), COREFILE_PATH, _configured_domain(),
cell_links=cell_link_manager.list_connections())
return jsonify({"message": f"Peer {peer_name} updated", "config_changed": config_changed})
api/routes/wireguard.py
+12 -3
View File
@@ -1,4 +1,5 @@
import logging
import ipaddress
from flask import Blueprint, request, jsonify
logger = logging.getLogger('picell')
bp = Blueprint('wireguard', __name__)
@@ -221,11 +222,19 @@ def refresh_external_ip():
@bp.route('/api/wireguard/apply-enforcement', methods=['POST'])
def apply_wireguard_enforcement():
try:
from app import peer_registry, firewall_manager, cell_link_manager, _configured_domain, COREFILE_PATH
from app import (peer_registry, wireguard_manager, firewall_manager,
cell_link_manager, _configured_domain, COREFILE_PATH)
peers = peer_registry.list_peers()
firewall_manager.apply_all_peer_rules(peers)
try:
_wg_addr = wireguard_manager._get_configured_address()
_wg_subnet = str(ipaddress.ip_network(_wg_addr, strict=False)) if _wg_addr else '10.0.0.0/24'
except Exception:
_wg_subnet = '10.0.0.0/24'
_cell_links = cell_link_manager.list_connections()
_cell_subnets = [l['vpn_subnet'] for l in _cell_links if l.get('vpn_subnet')]
firewall_manager.apply_all_peer_rules(peers, wg_subnet=_wg_subnet, cell_subnets=_cell_subnets)
firewall_manager.apply_all_dns_rules(peers, COREFILE_PATH, _configured_domain(),
cell_links=cell_link_manager.list_connections())
cell_links=_cell_links)
return jsonify({'ok': True, 'peers': len(peers)})
except Exception as e:
return jsonify({'error': str(e)}), 500