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CVS log for src/sys/netinet6/frag6.c

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Default branch: MAIN
Current tag: phil-wifi-20190609


Revision 1.74 / (download) - annotate - [select for diffs], Tue May 15 19:16:38 2018 UTC (5 years, 10 months ago) by maxv
Branch: MAIN
CVS Tags: phil-wifi-base, phil-wifi-20190609, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, netbsd-9-base, netbsd-9-3-RELEASE, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, isaki-audio2-base, isaki-audio2
Branch point for: phil-wifi, netbsd-9
Changes since 1.73: +12 -3 lines
Diff to previous 1.73 (colored)

When reassembling IPv4/IPv6 packets, ensure each fragment has been subject
to the same IPsec processing. That is to say, that all fragments are ESP,
or AH, or AH+ESP, or none.

The reassembly mechanism can be used both on the wire and inside an IPsec
tunnel, so we need to make sure all fragments of a packet were received
on only one side.

Even though I haven't tried, I believe there are configurations where it
would be possible for an attacker to inject an unencrypted fragment into a
legitimate stream of already-decrypted-and-authenticated fragments.

Typically on IPsec gateways with ESP tunnels, where we can encapsulate
fragments (as opposed to the general case, where we fragment encapsulated
data).

Note, for the record: a funnier thing, under IPv4, would be to send a
zero-sized !MFF fragment at the head of the packet, and manage to trigger
an ICMP error; M_DECRYPTED gets lost by the reassembly, and ICMP will reply
with the packet in clear (not encrypted).

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