mirror of
https://github.com/mandiant/gopacket
synced 2026-06-21 13:57:02 +00:00
Jacob Paullus
8eea029431
The embedded gokrb5/v8 library hard-coded net.DialTimeout for AS/TGS
exchanges, bypassing -proxy and leaking the operator's source IP to the
KDC (UDP/88 first, TCP/88 fallback). The DCERPC Kerberos auth path used
a separate library (oiweiwei/gokrb5.fork/v9 via go-msrpc) that leaked the
same way.
Vendor jcmturner/gokrb5/v8 in-tree at pkg/third_party/gokrb5 with a
required KDCDialer first argument on every client constructor, so
proxy-bypass becomes a compile error. Wire kerberos.TransportKDCDialer
everywhere a gokrb5 client is built. Stamp udp_preference_limit=1 and
dns_lookup_kdc/realm=false unconditionally so KRB5 is TCP-only and the
OS resolver is never consulted; /etc/krb5.conf and $KRB5_CONFIG are
deliberately not read.
For DCERPC: set krbConfig.KDCDialer on every krb5.Config, pass
dcerpc.WithDialer(transport.ContextDialer{}) on every dcerpc.Dial, and
use the "ncacn_ip_tcp:" StringBinding prefix on the OXID-pivot dial so
go-msrpc's hard-coded pre-dial net.LookupIP is skipped (defers FQDN
resolution to the SOCKS5 proxy).
Verified against a live GOAD lab: 8 Kerberos-touching tools plus 5
NTLM/password/PtH regressions all operate through SOCKS5 with zero
direct packets to the AD subnet. Negative control (no -proxy)
immediately emits direct SYNs to the KDC, confirming both the leak
class and the fix.
29 lines
562 B
Go
29 lines
562 B
Go
/*
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Package gokrb5 provides a Kerberos 5 implementation for Go.
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This is a pure Go implementation and does not have dependencies on native libraries.
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Feature include:
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Server Side
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HTTP handler wrapper implements SPNEGO Kerberos authentication.
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HTTP handler wrapper decodes Microsoft AD PAC authorization data.
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Client Side
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Client that can authenticate to an SPNEGO Kerberos authenticated web service.
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Ability to change client's password.
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General
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Kerberos libraries for custom integration.
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Parsing Keytab files.
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Parsing krb5.conf files.
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*/
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package gokrb5
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