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Respond with error when open invitation buckets are empty 

Expand the error type returns by invite() to include a new error for
when there are no available bridges for open invitation users. This
fixes a bug that previously caused a panic when we have no bridges to
distribute.

See https://gitlab.torproject.org/tpo/anti-censorship/lox/-/issues/43
This commit is contained in:
Cecylia Bocovich 2023-12-20 13:52:42 -05:00
parent 364b55dc4c
commit 39449cabe8
No known key found for this signature in database
GPG Key ID: 009DE379FD9B7B90
2 changed files with 12 additions and 6 deletions
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6
crates/lox-distributor/src/lox_context.rs
View File

@ -6,7 +6,7 @@ use lox_library::{
blockage_migration, check_blockage, issue_invite, level_up, migration, open_invite,
redeem_invite, trust_promotion,
},
BridgeAuth, BridgeDb, ExceededMaxBridgesError, IssuerPubKey,
BridgeAuth, BridgeDb, OpenInvitationError, IssuerPubKey,
};
use rdsys_backend::proto::{Resource, ResourceState};
use serde::{Deserialize, Serialize};
@ -361,7 +361,7 @@ impl LoxServerContext {
// Generates a Lox invitation if fewer than MAX_BRIDGES_PER_DAY have been
// requested on a given day
fn gen_invite(&self) -> Result<lox_utils::Invite, ExceededMaxBridgesError> {
fn gen_invite(&self) -> Result<lox_utils::Invite, OpenInvitationError> {
let mut obj = self.db.lock().unwrap();
match obj.invite() {
Ok(invite) => {
@ -450,7 +450,7 @@ impl LoxServerContext {
}
},
Err(e) => {
println!("Error parsing Invite to JSON");
println!("Error generating open invitation");
prepare_error_header(e.to_string())
}
}

12
crates/lox-library/src/lib.rs
View File

@ -86,9 +86,12 @@ pub enum NoAvailableIDError {
/// This error is thrown after the MAX_DAILY_BRIDGES threshold for bridges
/// distributed in a day has been reached
#[derive(Error, Debug)]
pub enum ExceededMaxBridgesError {
pub enum OpenInvitationError {
#[error("The maximum number of bridges has already been distributed today, please try again tomorrow!")]
ExceededMaxBridges,
#[error("There are no bridges available for open invitations.")]
NoBridgesAvailable,
}
/// Private Key of the Issuer
@ -215,7 +218,7 @@ impl BridgeDb {
/// Produce an open invitation such that the next k users, where k is <
/// OPENINV_K, will receive the same open invitation bucket
/// chosen randomly from the set of open-invitation buckets.
pub fn invite(&mut self) -> Result<[u8; OPENINV_LENGTH], ExceededMaxBridgesError> {
pub fn invite(&mut self) -> Result<[u8; OPENINV_LENGTH], OpenInvitationError> {
let mut res: [u8; OPENINV_LENGTH] = [0; OPENINV_LENGTH];
let mut rng = rand::thread_rng();
// Choose a random invitation id (a Scalar) and serialize it
@ -226,6 +229,9 @@ impl BridgeDb {
self.today = Utc::now();
self.daily_bridges_distributed = 0;
}
if self.openinv_buckets.is_empty() {
return Err(OpenInvitationError::NoBridgesAvailable)
}
if self.daily_bridges_distributed < MAX_DAILY_BRIDGES {
if self.current_k < OPENINV_K && !self.distributed_buckets.is_empty() {
bucket_num = *self.distributed_buckets.last().unwrap();
@ -246,7 +252,7 @@ impl BridgeDb {
res[(32 + 4)..].copy_from_slice(&sig.to_bytes());
Ok(res)
} else {
Err(ExceededMaxBridgesError::ExceededMaxBridges)
Err(OpenInvitationError::ExceededMaxBridges)
}
}