From 29a110faaea01c9973340d2b1f3644f983d36d58 Mon Sep 17 00:00:00 2001 From: David Goulet Date: Tue, 26 Nov 2019 15:11:38 -0500 Subject: rend-spec-v3.txt: Merge prop305 in it Signed-off-by: David Goulet --- rend-spec-v3.txt | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) (limited to 'rend-spec-v3.txt') diff --git a/rend-spec-v3.txt b/rend-spec-v3.txt index a3e0b0a..68f6c28 100644 --- a/rend-spec-v3.txt +++ b/rend-spec-v3.txt @@ -50,6 +50,7 @@ Table of contents: 3. The introduction protocol [INTRO-PROTOCOL] 3.1. Registering an introduction point [REG_INTRO_POINT] 3.1.1. Extensible ESTABLISH_INTRO protocol. [EST_INTRO] + 3.1.1.1. Denial-of-Server Defense Extension. [EST_INTRO_DOS_EXT] 3.1.2. Registering an introduction point on a legacy Tor node [LEGACY_EST_INTRO] 3.1.3. Acknowledging establishment of introduction point [INTRO_ESTABLISHED] 3.2. Sending an INTRODUCE1 cell to the introduction point. [SEND_INTRO1] @@ -1566,6 +1567,67 @@ Table of contents: Otherwise, the node must associate the key with the circuit, for use later in INTRODUCE1 cells. +3.1.1.1. Denial-of-Service Defense Extension. [EST_INTRO_DOS_EXT] + + This extension can be used to send Denial-of-Service (DoS) parameters to + the introduction point in order for it to apply them for the introduction + circuit. + + If used, it needs to be encoded within the N_EXTENSIONS field of the + ESTABLISH_INTRO cell defined in the previous section. The content is + defined as follow: + + EXT_FIELD_TYPE: + + [01] -- Denial-of-Service Parameters. + + If this flag is set, the extension should be used by the introduction + point to learn what values the denial of service subsystem should be + using. + + EXT_FIELD content format is: + + N_PARAMS [1 byte] + N_PARAMS times: + PARAM_TYPE [1 byte] + PARAM_VALUE [8 byte] + + The PARAM_TYPE possible values are: + + [01] -- DOS_INTRODUCE2_RATE_PER_SEC + The rate per second of INTRODUCE2 cell relayed to the + service. + + [02] -- DOS_INTRODUCE2_BURST_PER_SEC + The burst per second of INTRODUCE2 cell relayed to the + service. + + The PARAM_VALUE size is 8 bytes in order to accomodate 64bit values. + It MUST match the specified limit for the following PARAM_TYPE: + + [01] -- Min: 0, Max: 2147483647 + [02] -- Min: 0, Max: 2147483647 + + A value of 0 means the defense is disabled. If the rate per second is + set to 0 (param 0x01) then the burst value should be ignored. And + vice-versa, if the burst value is 0 (param 0x02), then the rate value + should be ignored. In other words, setting one single parameter to 0 + disables the defense. + + The burst can NOT be smaller than the rate. If so, the parameters + should be ignored by the introduction point. + + Any valid value does have precedence over the network wide consensus + parameter. + + Using this extension extends the payload of the ESTABLISH_INTRO cell by 19 + bytes bringing it from 134 bytes to 155 bytes. + + This extension can only be used with relays supporting the protocol version + "HSIntro=5". + + Introduced in tor-0.4.2.1-alpha. + 3.1.2. Registering an introduction point on a legacy Tor node [LEGACY_EST_INTRO] -- cgit v1.2.3-54-g00ecf