Hello Tor-Dev!
As part of some discussions that happened at the Seattle Tor Meeting few weeks
ago, we've talked about the number of introduction points in an hidden service
descriptor for proposal 224 (next generation HS).
I've attached a spec change with the values ranging:
Minimum: 0 - Default: 3 - Maximum: 20
The changes from what we have right now is basically the maximum. We would
like to go from 10 to 20. It's arbitrary for now but one of the main reasons
is to allow tools like OnionBalance to be able to scale more as we heard from
large HS operators that they would like to go above 60 (10 * 6 HSDirs).
Let us know what you think!
Cheers!
David
diff --git a/proposals/224-rend-spec-ng.txt b/proposals/224-rend-spec-ng.txt
index 558cf1f..1fe738d 100644
--- a/proposals/224-rend-spec-ng.txt
+++ b/proposals/224-rend-spec-ng.txt
@@ -37,6 +37,7 @@ Table of contents:
2.3.2. Hidden services and changing shared random values
2.4. Hidden service descriptors: outer wrapper [DESC-OUTER]
2.5. Hidden service descriptors: encryption format [ENCRYPTED-DATA]
+ 2.5.1. Number of introduction points [NUM_INTRO_POINT]
3. The introduction protocol
3.1. Registering an introduction point [REG_INTRO_POINT]
3.1.1. Extensible ESTABLISH_INTRO protocol. [EST_INTRO]
@@ -999,7 +1000,8 @@ Table of contents:
able to contact the host. Recognized types are: 'password' and
'ed25519'. See [INTRO-AUTH] below.
- Followed by zero or more introduction points as follows:
+ Followed by zero or more introduction points as follows (see section
+ [NUM_INTRO_POINT] below for accepted values):
"introduction-point" SP link-specifiers NL
@@ -1058,6 +1060,21 @@ Table of contents:
Other encryption and authentication key formats are allowed; clients
should ignore ones they do not recognize.
+2.5.1. Number of introduction points [NUM_INTRO_POINT]
+
+ This section defines how many introduction points an hidden service
+ descriptor can have at minimum, by default and the maximum:
+
+ Minimum: 0 - Default: 3 - Maximum: 20
+
+ A value of 0 would means that the service is still alive but doesn't want
+ to be reached by any client at the moment. Note that the descriptor size
+ increases considerably as more introduction points are added.
+
+ The reason for a maximum value of 20 is to give enough scalability to tools
+ like OnionBalance to be able to load balance up to 120 servers (20 x 6
+ HSDirs) but also in order for the descriptor size to not overwhelmed hidden
+ service directories with user defined values that could be gigantic.
3. The introduction protocol
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