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Document ACKs/NAKs

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svn:r1599
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Nick Mathewson 2004-04-13 00:50:11 +00:00
parent 5af7e27c62
commit 88950f4ac2
1 changed files with 14 additions and 3 deletions
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17
doc/rend-spec.txt
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@ -34,7 +34,7 @@ Tor Rendezvous Spec
In the specifications below, we use the same notation as in In the specifications below, we use the same notation as in
"tor-spec.txt". The service specified here also requires the existence of "tor-spec.txt". The service specified here also requires the existence of
an onion routing network as specified in "tor-spec.txt". an onion routing network as specified in "tor-spec.txt".
H(x) is a SHA1 digest of x. H(x) is a SHA1 digest of x.
PKSign(SK,x) is a PKCS.1-padded RSA signature of x with SK. PKSign(SK,x) is a PKCS.1-padded RSA signature of x with SK.
@ -93,6 +93,9 @@ Tor Rendezvous Spec
35 -- RELAY_INTRODUCE2 35 -- RELAY_INTRODUCE2
36 -- RELAY_RENDEZVOUS1 36 -- RELAY_RENDEZVOUS1
37 -- RELAY_RENDEZVOUS2 37 -- RELAY_RENDEZVOUS2
38 -- RELAY_INTRO_ESTABLISHED
39 -- RELAY_RENDEZVOUS_ESTABLISHED
40 -- RELAY_COMMAND_INTRODUCE_ACK
1. The Protocol 1. The Protocol
@ -154,7 +157,8 @@ Tor Rendezvous Spec
correct given the shared state between Bob's OP and the OR. If either correct given the shared state between Bob's OP and the OR. If either
check fails, the OP discards the cell; otherwise, it associates the check fails, the OP discards the cell; otherwise, it associates the
circuit with Bob's public key, and dissociates any other circuits circuit with Bob's public key, and dissociates any other circuits
currently associated with PK. currently associated with PK. On success, the OR sends Bob a
RELAY_INTRO_ESTABLISHED cell with an empty payload.
1.4. Bob's OP advertises his server descriptor 1.4. Bob's OP advertises his server descriptor
@ -230,7 +234,8 @@ Tor Rendezvous Spec
Alice's OP. Alice's OP.
Upon receiving a RELAY_ESTABLISH_RENDEZVOUS cell, the OR associates the Upon receiving a RELAY_ESTABLISH_RENDEZVOUS cell, the OR associates the
RC with the circuit that sent it. RC with the circuit that sent it. It replies to Alice with an empty
RELAY_RENDEZVOUS_ESTABLISHED cell to indicate success.
Alice's OP MUST NOT use the circuit which sent the cell for any purpose Alice's OP MUST NOT use the circuit which sent the cell for any purpose
other than rendezvous with the given location-hidden service. other than rendezvous with the given location-hidden service.
@ -264,6 +269,12 @@ Tor Rendezvous Spec
of the cell in a new RELAY_INTRODUCE2 cell down the corresponding circuit. of the cell in a new RELAY_INTRODUCE2 cell down the corresponding circuit.
(If the PK_ID is unrecognized, the RELAY_INTRODUCE1 cell is discarded.) (If the PK_ID is unrecognized, the RELAY_INTRODUCE1 cell is discarded.)
After sending the RELAY_INTRODUCE2 cell, the OR replies to Alice with an
empty RELAY_COMMAND_INTRODUCE_ACK cell. If no RELAY_INTRODUCE2 cell can
be sent, the OR replies to Alice with a non-empty cell to indicate an
error. (The semantics of the cell body may be determined later; the
current implementation sends a single '1' byte on failure.)
When Bob's OP receives the RELAY_INTRODUCE2 cell, it decrypts it with When Bob's OP receives the RELAY_INTRODUCE2 cell, it decrypts it with
the private key for the corresponding hidden service, and extracts the the private key for the corresponding hidden service, and extracts the
rendezvous point's nickname, the rendezvous cookie, and the value of g^x rendezvous point's nickname, the rendezvous cookie, and the value of g^x