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The IANA has allocated a few more authentication methods, minimally extend the signature to catch those.
62 lines
1.7 KiB
Standard ML
62 lines
1.7 KiB
Standard ML
signature dpd_socks4_client {
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ip-proto == tcp
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# '32' is a rather arbitrary max length for the user name.
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payload /^\x04[\x01\x02].{0,32}\x00/
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tcp-state originator
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}
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signature dpd_socks4_server {
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ip-proto == tcp
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requires-reverse-signature dpd_socks4_client
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payload /^\x00[\x5a\x5b\x5c\x5d]/
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tcp-state responder
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enable "socks"
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}
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signature dpd_socks4_reverse_client {
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ip-proto == tcp
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# '32' is a rather arbitrary max length for the user name.
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payload /^\x04[\x01\x02].{0,32}\x00/
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tcp-state responder
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}
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signature dpd_socks4_reverse_server {
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ip-proto == tcp
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requires-reverse-signature dpd_socks4_reverse_client
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payload /^\x00[\x5a\x5b\x5c\x5d]/
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tcp-state originator
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enable "socks"
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}
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signature dpd_socks5_client {
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ip-proto == tcp
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# Watch for a few authentication methods to reduce false positives.
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payload /^\x05.[\x00\x01\x02\x03\x05\x06\x07\x08\x09]/
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tcp-state originator
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}
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signature dpd_socks5_server {
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ip-proto == tcp
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requires-reverse-signature dpd_socks5_client
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# Watch for a single authentication method to be chosen by the server or
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# the server to indicate the no authentication is required.
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# From wikipedia:
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# 0x00: No authentication
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# 0x01: GSSAPI (RFC 1961)
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# 0x02: Username/password (RFC 1929)
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# 0x03–0x7F: methods assigned by IANA[11]
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# 0x03: Challenge-Handshake Authentication Protocol
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# 0x04: Unassigned
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# 0x05: Challenge-Response Authentication Method
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# 0x06: Secure Sockets Layer
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# 0x07: NDS Authentication
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# 0x08: Multi-Authentication Framework
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# 0x09: JSON Parameter Block
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# 0x0A–0x7F: Unassigned
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# 0x80–0xFE: methods reserved for private use
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#
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# Keep in sync with dpd_socks5_client, 0xff is "no acceptable methods"
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payload /^\x05[\x00\x01\x02\x03\x05\x06\x07\x08\x09\xff]/
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tcp-state responder
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enable "socks"
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}
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