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[tor-bugs] #7971 [Tor]: review address lists in tor_addr_is_internal_()
#7971: review address lists in tor_addr_is_internal_()
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Reporter: cypherpunks | Owner:
Type: defect | Status: new
Priority: normal | Milestone:
Component: Tor | Version:
Keywords: | Parent:
Points: | Actualpoints:
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Tor's common/address.c's tor_addr_is_internal_() might be a bit dated,
regarding it's list of IANA special-purpose registry, and the IETF
RFCs/I-Ds it uses. That code looks for reserved/localhost addresses, and
mentions RFCs: 1918, 3879, 4193, and 4291, all of which are outdated.
Yesterday's I-D draft-bonica-special-purpose-06 <http://tools.ietf.org/id
/draft-bonica-special-purpose-06.txt> is a list of all of the addresses,
which are in RFC5735 (IPv4 addresses) and RFC5156 (IPv6 addresses). The
I-D lists 16 addresses for IPv4 and 12 addresses for IPv6.
Tor appears to handle 7 IPv4 addresses (not 16), and 5 IPv6 addresses (not
12); and I don't think one of those (FEC0/10) is shared between the Tor
and I-D lists, and might be either a Tor bug or an IETF I-D bug, or my
misreading).
Someone who has a better understanding of how Tor uses local addresses,
might want to review Tor's code, alongside a current I-D, to see if any of
those missing addresses should be added. The I-D has more data than the
below tables, so more helpful for deciding.
Tor IPv4 cases:
"0.0.0.0"
"10/8"
"0/8"
"127/8"
"169.254/16"
"172.16/12"
"192.168/16"
I-D IPv4 cases:
"0.0.0.0/8" (RFC 1122: 'This' Network)
"10.0.0.0/8" (RFC 1918: Private-Use)
"100.64.0.0/10" (RFC 6598: Shared Address Space)
"127.0.0.0/8" (RFC 1122: Loopback)
"169.254.0.0/16" (RFC 3927: Link Local)
"172.16.0.0/12" (RFC 1122: Private-Use)
"192.0.0.0/24" (RFC 5736: IETF Protocol Assignments)
"192.0.0.0/29" (RFC 6333: DS-Lite)
"192.0.2.0/24" (RFC 5737: Documentation (TEST-NET-1))
"192.88.99.0/24" (RFC 3068: 6to4 Relay Anycast)
"192.168.0.0/16" (RFC 1918: Private-Use)
"198.18.0.0/15" (RFC 2544: Benchmarking)
"198.51.100.0/24" (RFC 5737: Documentation (TEST-NET-2))
"203.0.113.0/24" (RFC 5737: Documentation (TEST-NET-3))
"240.0.0.0/4" (RFC 1112: Reserved)
"255.255.255.255/32" (RFC 0919: Limited Broadcast)
Tor IPv6 cases:
"::"
"::/127"
"fc00/7"
"fe80/10"
"fec0/10"
I-D IPv6 cases:
"::1/128" (RFC 4291: Loopback Address)
"::/128" (RFC 4291: Unspecified Address)
"::FFFF:0:0/96" (RFC 4291: IPv4-mapped Address)
"0100::/64" (RFC 6666: Discard-Only Prefix)
"2001:0000::/23" (RFC 2928: IETF Protocol Assignments)
"2001:0000::/32" (RFC 4380: TEREDO)
"2001:0002::/48" (RFC 5180: Benchmarking)
"2001:db8::/32" (RFC 3849: Documentation)
"2001:10::/28" (RFC 4843: ORCHID)
"2002::/16" (RFC 3056: 6to4)
"FC00::/7" (RFC 4193: Unique-Local)
"FE80::/10" (RFC 4291: Linked-Scoped Unicast)
Thanks,
Lee
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7971>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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