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r7056@Kushana: nickm | 2006-08-08 23:40:53 -0700

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Add a comment about v0 fallback approach. Why did we dislike discriminating on X.509 certs again?


svn:r6996
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Nick Mathewson 2006-08-09 06:41:29 +00:00
parent 070d5555d2
commit 8b2b28a5ef
1 changed files with 13 additions and 4 deletions
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doc/tor-spec.txt
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@ -138,8 +138,8 @@ when do we rotate which keys (tls, link, etc)?
additional fields to existing structures; implementations are constrained additional fields to existing structures; implementations are constrained
to ignore fields they do not expect. to ignore fields they do not expect.
Parties negotiate OR connection versions as described below in section Parties negotiate OR connection versions as described below in sections
4.1 and 4.2.
2. Connections 2. Connections
@ -305,13 +305,22 @@ when do we rotate which keys (tls, link, etc)?
0 when the other side is recognized as a router running version 0 when the other side is recognized as a router running version
0.1.2.??-alpha or earlier. 0.1.2.??-alpha or earlier.
If a server finds that it wants to send a cell (for example because a [If a server finds that it wants to send a cell (for example because a
circuit wants to extend to that client, and the TLS connection circuit wants to extend to that client, and the TLS connection
is already established) yet no cell has arrived yet, we can't is already established) yet no cell has arrived yet, we can't
distinguish between a version 0 client and a slow network. We can't distinguish between a version 0 client and a slow network. We can't
assume that the other side approves of version 0, so we can't just assume that the other side approves of version 0, so we can't just
start using version 0. Perhaps the right answer is to then launch a start using version 0. Perhaps the right answer is to then launch a
new TLS connection because you don't have a usable one after all? new TLS connection because you don't have a usable one after all? -RD]
[That would seem to be thrashy. Let's see if we can do better. Remember,
normal v0 clients always send something after connecting, so if we have
had a connection for a while and gotten nothing over it, we could get away
with assuming it's bad. Alternatively, we could identify V0 clients by
the OU=Tor field in the certificates: we don't check for it, and we never
documented it. We might break other people's clients by sending them
hello cells, but only if those clients are nonconformant. Am I right?
In any case, this seems way more reliable. -NM]
5. Circuit management 5. Circuit management