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f76946fc41
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Add SIP topology hiding feature (B2BUA-lite)
Implements RFC 3261 compliant topology hiding to protect internal
infrastructure from external attackers:
New files:
- sipmsg.go: SIP message parsing/serialization with full header support
- sipheaders.go: Via, Contact, From/To header parsing with compact forms
- dialog_state.go: Dialog and transaction state management for response correlation
- topology.go: TopologyHider handler for caddy-l4 integration
- topology_test.go: Comprehensive unit tests (26 new tests, 60 total)
Features:
- Via header insertion (proxy adds own Via, pops on response)
- Contact header rewriting (hide internal IPs behind proxy address)
- Sensitive header stripping (P-Asserted-Identity, Server, etc.)
- Call-ID anonymization (optional)
- Private IP masking in all headers
- Dialog state tracking for stateful response routing
- Transaction state for stateless operation
Caddyfile configuration:
sip_topology_hider {
proxy_host 203.0.113.1
proxy_port 5060
upstream udp/192.168.1.100:5060
rewrite_via
rewrite_contact
strip_headers P-Preferred-Identity Server
}
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2025-12-07 19:02:50 -07:00 |
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