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Re: [tor-bugs] #34129 [Circumvention/Snowflake]: Use STUN to determine NAT behaviour of peers
#34129: Use STUN to determine NAT behaviour of peers
-------------------------------------+---------------------------
Reporter: cohosh | Owner: cohosh
Type: enhancement | Status: assigned
Priority: Medium | Milestone:
Component: Circumvention/Snowflake | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor: Sponsor28
-------------------------------------+---------------------------
Comment (by dcf):
I did `apt install coturn` to use the
[https://github.com/coturn/coturn/wiki/turnutils_stunclient
turnutils_stunclient] program. I ran it and got the following output. I
changed my actual IP address to `192.0.2.3`.
{{{
$ turnutils_stunclient -f 174.138.112.125
========================================
RFC 5780 response 1
0: IPv4. Response origin: : 10.20.0.7:3478
0: IPv4. Other addr: : 68.183.200.83:3479
0: IPv4. UDP reflexive addr: 192.0.2.3:32960
}}}
turnutils_stunclient then hangs until I ctrl-C it.
Looking at a packet capture, there are 2 outgoing packets and 1 incoming
packet.
{{{
Internet Protocol Version 4, Src: 192.168.0.2, Dst: 174.138.112.125
User Datagram Protocol, Src Port: 32960 (32960), Dst Port: stun (3478)
Session Traversal Utilities for NAT
Message Type: 0x0001 (Binding Request)
.... ...0 ...0 .... = Message Class: 0x00 Request (0)
..00 000. 000. 0001 = Message Method: 0x0001 Binding (0x001)
..0. .... .... .... = Message Method Assignment: IETF Review (0x0)
Message Length: 0
Message Cookie: 2112a442
Message Transaction ID: c7766860ae3304ad85de6440
Internet Protocol Version 4, Src: 174.138.112.125, Dst: 192.168.0.2
User Datagram Protocol, Src Port: stun (3478), Dst Port: 32960 (32960)
Session Traversal Utilities for NAT
[Request In: 1]
[Time: 0.123115000 seconds]
Message Type: 0x0101 (Binding Success Response)
.... ...1 ...0 .... = Message Class: 0x10 Success Response (2)
..00 000. 000. 0001 = Message Method: 0x0001 Binding (0x001)
..0. .... .... .... = Message Method Assignment: IETF Review (0x0)
Message Length: 56
Message Cookie: 2112a442
Message Transaction ID: c7766860ae3304ad85de6440
Attributes
XOR-MAPPED-ADDRESS: 192.0.2.3:32960
Attribute Type: XOR-MAPPED-ADDRESS (0x0020)
0... .... .... .... = Attribute Type Comprehension:
Required (0x0)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 8
Reserved: 00
Protocol Family: IPv4 (0x01)
Port (XOR-d): a1d2
[Port: 32960]
IP (XOR-d): e112a641
[IP: 192.0.2.3]
MAPPED-ADDRESS: 192.0.2.3:32960
Attribute Type: MAPPED-ADDRESS (0x0001)
0... .... .... .... = Attribute Type Comprehension:
Required (0x0)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 8
Reserved: 00
Protocol Family: IPv4 (0x01)
Port: 32960
IP: 192.0.2.3
RESPONSE-ORIGIN: 10.20.0.7:3478
Attribute Type: RESPONSE-ORIGIN (0x802b)
1... .... .... .... = Attribute Type Comprehension:
Optional (0x1)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 8
Reserved: 00
Protocol Family: IPv4 (0x01)
Port: 3478
IP: 10.20.0.7
OTHER-ADDRESS: 68.183.200.83:3479
Attribute Type: OTHER-ADDRESS (0x802c)
1... .... .... .... = Attribute Type Comprehension:
Optional (0x1)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 8
Reserved: 00
Protocol Family: IPv4 (0x01)
Port: 3479
IP: 68.183.200.83
SOFTWARE
Attribute Type: SOFTWARE (0x8022)
1... .... .... .... = Attribute Type Comprehension:
Optional (0x1)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 4
Software: None
Internet Protocol Version 4, Src: 192.168.0.2, Dst: 174.138.112.125
User Datagram Protocol, Src Port: 32960 (32960), Dst Port: stun (3478)
Session Traversal Utilities for NAT
Message Type: 0x0001 (Binding Request)
.... ...0 ...0 .... = Message Class: 0x00 Request (0)
..00 000. 000. 0001 = Message Method: 0x0001 Binding (0x001)
..0. .... .... .... = Message Method Assignment: IETF Review (0x0)
Message Length: 16
Message Cookie: 2112a442
Message Transaction ID: 71532acd2efaf39f4cabcb5b
Attributes
XOR-RESPONSE-TARGET
Attribute Type: XOR-RESPONSE-TARGET (0x0027)
0... .... .... .... = Attribute Type Comprehension:
Required (0x0)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 4
Reserved: 80
Protocol Family: Unknown (0xc1)
Port (XOR-d): 0000
[Port: 8466]
CHANGE_REQUEST
Attribute Type: CHANGE_REQUEST (0x0003)
0... .... .... .... = Attribute Type Comprehension:
Required (0x0)
.0.. .... .... .... = Attribute Type Assignment: IETF
Review (0x0)
Attribute Length: 4
.... .... .... .1.. = Change IP: Set
.... .... .... ..1. = Change Port: Set
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34129#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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