683 lines
26 KiB
Rust
683 lines
26 KiB
Rust
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// User behavior in simulation
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use crate::{
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bridge::Bridge,
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censor::{Censor, Secrecy::*, Totality::*},
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config::Config,
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};
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use anyhow::{anyhow, Result};
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use lox_cli::{networking::*, *};
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use lox_library::{
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bridge_table::BridgeLine, cred::Lox, proto::check_blockage::MIN_TRUST_LEVEL, scalar_u32,
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};
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use rand::Rng;
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use std::{cmp::min, collections::HashMap};
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use troll_patrol::{
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get_date, negative_report::NegativeReport, positive_report::PositiveReport, BridgeDistributor,
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};
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use x25519_dalek::PublicKey;
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// Helper function to probabilistically return true or false
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pub fn event_happens(probability: f64) -> bool {
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let mut rng = rand::thread_rng();
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let num: f64 = rng.gen_range(0.0..1.0);
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num < probability
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}
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pub struct User {
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// Does this user cooperate with a censor?
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pub is_censor: bool,
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// The user always has a primary credential. If this credential's bucket is
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// blocked, the user may replace it or temporarily hold two credentials
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// while waiting to migrate from the primary credential.
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pub primary_cred: Lox,
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secondary_cred: Option<Lox>,
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// Does the user submit reports to Troll Patrol?
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submits_reports: bool,
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// How likely is this user to use bridges on a given day?
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prob_use_bridges: f64,
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}
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impl User {
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pub async fn new(config: &Config, is_censor: bool) -> Result<Self> {
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let cred = get_lox_credential(
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&config.la_net,
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&get_open_invitation(&config.la_net).await?,
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get_lox_pub(&config.la_pubkeys),
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)
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.await?
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.0;
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// Probabilistically decide whether this user submits reports
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let submits_reports = if is_censor {
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false
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} else {
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event_happens(config.prob_user_submits_reports)
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};
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// Randomly determine how likely this user is to use bridges on
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// a given day
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let mut rng = rand::thread_rng();
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let prob_use_bridges = rng.gen_range(0.0..=1.0);
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Ok(Self {
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is_censor,
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primary_cred: cred,
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secondary_cred: None,
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submits_reports: submits_reports,
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prob_use_bridges: prob_use_bridges,
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})
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}
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pub async fn trusted_user(config: &Config) -> Result<Self> {
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let cred = get_lox_credential(
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&config.la_net,
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&get_open_invitation(&config.la_net).await?,
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get_lox_pub(&config.la_pubkeys),
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)
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.await?
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.0;
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Ok(Self {
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is_censor: false,
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primary_cred: cred,
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secondary_cred: None,
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submits_reports: true,
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prob_use_bridges: 1.0,
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})
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}
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// TODO: This should probably return an actual error type
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pub async fn invite(
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&mut self,
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config: &Config,
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censor: &mut Censor,
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invited_user_is_censor: bool,
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) -> Result<Self> {
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let etable = get_reachability_credential(&config.la_net).await?;
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let (new_cred, invite) = issue_invite(
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&config.la_net,
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&self.primary_cred,
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&etable,
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get_lox_pub(&config.la_pubkeys),
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get_reachability_pub(&config.la_pubkeys),
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get_invitation_pub(&config.la_pubkeys),
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)
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.await?;
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self.primary_cred = new_cred;
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if self.is_censor {
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// Make sure censor has access to each bridge and each
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// credential
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let (bucket, _reachcred) = get_bucket(&config.la_net, &self.primary_cred).await?;
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for bl in bucket {
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let fingerprint = bl.get_hashed_fingerprint();
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censor.learn_bridge(&fingerprint);
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censor.give_lox_cred(&fingerprint, &self.primary_cred);
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}
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}
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let friend_cred = redeem_invite(
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&config.la_net,
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&invite,
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get_lox_pub(&config.la_pubkeys),
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get_invitation_pub(&config.la_pubkeys),
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)
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.await?
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.0;
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// Calling function decides if the invited user is a censor
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let is_censor = invited_user_is_censor;
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// Probabilistically decide whether this user submits reports
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let submits_reports = if is_censor {
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false
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} else {
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event_happens(config.prob_user_submits_reports)
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};
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// Randomly determine how likely this user is to use bridges on
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// a given day
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let mut rng = rand::thread_rng();
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let prob_use_bridges = rng.gen_range(0.0..=1.0);
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Ok(Self {
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is_censor,
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primary_cred: friend_cred,
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secondary_cred: None,
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submits_reports: submits_reports,
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prob_use_bridges: prob_use_bridges,
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})
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}
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// Attempt to "connect" to the bridge, returns true if successful.
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// Note that this does not involve making a real connection to a
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// real bridge. The function is async because the *censor* might
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// submit a positive report during this function.
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pub fn connect(&self, config: &Config, bridge: &mut Bridge, censor: &Censor) -> bool {
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if censor.blocks_bridge(config, &bridge.fingerprint) {
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if config.censor_totality == Full
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|| config.censor_totality == Partial
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&& event_happens(censor.partial_blocking_percent)
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{
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// If censor tries to hide its censorship, record a
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// false connection
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if config.censor_secrecy == Hiding {
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bridge.connect_total();
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}
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// Return false because the connection failed
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return false;
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} else if config.censor_totality == Throttling {
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// With some probability, the user connects but gives up
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// because there is too much interference. In this case,
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// a real connection occurs, but we treat it like a
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// false connection from the censor.
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if event_happens(config.prob_user_treats_throttling_as_blocking) {
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bridge.connect_total();
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// Return false because there was interference
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// detected in the connection
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return false;
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}
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}
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}
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// Connection may randomly fail, without censor intervention
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let mut connection_fails = true;
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// The user retries some number of times
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for _ in 0..=config.num_connection_retries {
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if !event_happens(config.prob_connection_fails) {
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connection_fails = false;
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break;
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}
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}
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if connection_fails {
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return false;
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}
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// If we haven't returned yet, the connection succeeded
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bridge.connect_real();
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true
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}
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pub async fn get_new_credential(config: &Config) -> Result<(Lox, BridgeLine)> {
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get_lox_credential(
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&config.la_net,
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&get_open_invitation(&config.la_net).await?,
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get_lox_pub(&config.la_pubkeys),
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)
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.await
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}
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pub async fn send_negative_reports(
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config: &Config,
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reports: Vec<NegativeReport>,
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) -> Result<()> {
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let date = get_date();
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let pubkey = match serde_json::from_slice::<Option<PublicKey>>(
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&config
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.tp_net
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.request("/nrkey".to_string(), serde_json::to_string(&date)?.into())
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.await?,
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)? {
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Some(v) => v,
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None => return Err(anyhow!("No available negative report encryption key")),
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};
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for report in reports {
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config
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.tp_net
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.request(
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"/negativereport".to_string(),
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bincode::serialize(&report.encrypt(&pubkey))?,
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)
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.await?;
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}
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Ok(())
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}
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pub async fn send_positive_reports(
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config: &Config,
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reports: Vec<PositiveReport>,
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) -> Result<()> {
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for report in reports {
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config
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.tp_net
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.request("/positivereport".to_string(), report.to_json().into_bytes())
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.await?;
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}
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Ok(())
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}
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pub async fn daily_tasks(
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&mut self,
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config: &Config,
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num_users_requesting_invites: u32,
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num_censor_invites: u32,
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bridges: &mut HashMap<[u8; 20], Bridge>,
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censor: &mut Censor,
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) -> Result<Vec<User>> {
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if self.is_censor {
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self.daily_tasks_censor(config, bridges, censor).await
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} else {
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self.daily_tasks_non_censor(
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config,
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num_users_requesting_invites,
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num_censor_invites,
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bridges,
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censor,
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)
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.await
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}
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}
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// User performs daily connection attempts, etc. and returns a
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// vector of newly invited friends.
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// TODO: The map of bridges and the censor should be Arc<Mutex<>>
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// or something so we can parallelize this.
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pub async fn daily_tasks_non_censor(
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&mut self,
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config: &Config,
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num_users_requesting_invites: u32,
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num_censor_invites: u32,
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bridges: &mut HashMap<[u8; 20], Bridge>,
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censor: &mut Censor,
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) -> Result<Vec<User>> {
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// Probabilistically decide if the user should use bridges today
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if event_happens(self.prob_use_bridges) {
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// Download bucket to see if bridge is still reachable. (We
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// assume that this step can be done even if the user can't
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// actually talk to the LA.)
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let (bucket, reachcred) = get_bucket(&config.la_net, &self.primary_cred).await?;
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let level = match scalar_u32(&self.primary_cred.trust_level) {
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Some(v) => v,
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None => return Err(anyhow!("Failed to get trust level from credential")),
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};
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// Make sure each bridge in bucket is in the global bridges set
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for bridgeline in bucket {
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if bridgeline != BridgeLine::default() {
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if !bridges.contains_key(&bridgeline.get_hashed_fingerprint()) {
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let bridge = Bridge::from_bridge_line(&bridgeline);
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bridges.insert(bridgeline.get_hashed_fingerprint(), bridge);
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}
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}
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}
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// Can we level up the main credential?
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let can_level_up = reachcred.is_some()
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&& (level == 0
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&& eligible_for_trust_promotion(&config.la_net, &self.primary_cred).await
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|| level > 0
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&& eligible_for_level_up(&config.la_net, &self.primary_cred).await);
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// Can we migrate the main credential?
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let can_migrate = reachcred.is_none() && level >= MIN_TRUST_LEVEL;
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// Can we level up the secondary credential?
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let mut second_level_up = false;
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let mut failed = Vec::<BridgeLine>::new();
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let mut succeeded = Vec::<BridgeLine>::new();
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// Try to connect to each bridge
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for i in 0..bucket.len() {
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// At level 0, we only have 1 bridge
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if bucket[i] != BridgeLine::default() {
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if self.connect(
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&config,
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bridges
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.get_mut(&bucket[i].get_hashed_fingerprint())
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.unwrap(),
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&censor,
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) {
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succeeded.push(bucket[i]);
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} else {
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failed.push(bucket[i]);
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}
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}
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}
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// If we were not able to connect to any bridges, get a
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// second credential
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let second_cred = if succeeded.len() < 1 {
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if self.secondary_cred.is_some() {
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std::mem::replace(&mut self.secondary_cred, None)
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} else {
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// Get new credential
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match Self::get_new_credential(&config).await {
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Ok((cred, _bl)) => Some(cred),
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Err(e) => {
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eprintln!("Failed to get new Lox credential. Error: {}", e);
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None
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}
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}
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}
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} else {
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// If we're able to connect with the primary credential, don't
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// keep a secondary one.
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None
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};
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if second_cred.is_some() {
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let second_cred = second_cred.as_ref().unwrap();
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let (second_bucket, second_reachcred) =
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get_bucket(&config.la_net, &second_cred).await?;
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for bridgeline in second_bucket {
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if bridgeline != BridgeLine::default() {
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if !bridges.contains_key(&bridgeline.get_hashed_fingerprint()) {
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bridges.insert(
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bridgeline.get_hashed_fingerprint(),
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Bridge::from_bridge_line(&bridgeline),
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);
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}
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// Attempt to connect to second cred's bridge
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|
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if self.connect(
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|
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&config,
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bridges
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.get_mut(&bridgeline.get_hashed_fingerprint())
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||
|
|
.unwrap(),
|
||
|
|
censor,
|
||
|
|
) {
|
||
|
|
succeeded.push(bridgeline);
|
||
|
|
if second_reachcred.is_some()
|
||
|
|
&& eligible_for_trust_promotion(&config.la_net, &second_cred).await
|
||
|
|
{
|
||
|
|
second_level_up = true;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
failed.push(bridgeline);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
let mut negative_reports = Vec::<NegativeReport>::new();
|
||
|
|
let mut positive_reports = Vec::<PositiveReport>::new();
|
||
|
|
|
||
|
|
if self.submits_reports {
|
||
|
|
for bridgeline in &failed {
|
||
|
|
negative_reports.push(NegativeReport::from_bridgeline(
|
||
|
|
*bridgeline,
|
||
|
|
config.country.to_string(),
|
||
|
|
BridgeDistributor::Lox,
|
||
|
|
));
|
||
|
|
}
|
||
|
|
if level >= 3 {
|
||
|
|
for bridgeline in &succeeded {
|
||
|
|
// If we haven't received a positive report yet,
|
||
|
|
// add a record about it with today's date
|
||
|
|
let bridge = bridges
|
||
|
|
.get_mut(&bridgeline.get_hashed_fingerprint())
|
||
|
|
.unwrap();
|
||
|
|
if bridge.first_positive_report == 0 {
|
||
|
|
bridge.first_positive_report = get_date();
|
||
|
|
}
|
||
|
|
|
||
|
|
positive_reports.push(
|
||
|
|
PositiveReport::from_lox_credential(
|
||
|
|
bridgeline.get_hashed_fingerprint(),
|
||
|
|
None,
|
||
|
|
&self.primary_cred,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
config.country.to_string(),
|
||
|
|
)
|
||
|
|
.unwrap(),
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// We might restrict these steps to succeeded.len() > 0, but
|
||
|
|
// we do assume the user can contact the LA somehow, so
|
||
|
|
// let's just allow it.
|
||
|
|
if can_level_up {
|
||
|
|
let cred = if level == 0 {
|
||
|
|
trust_migration(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
&trust_promotion(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_migration_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?
|
||
|
|
} else {
|
||
|
|
level_up(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
&reachcred.unwrap(),
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_reachability_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?
|
||
|
|
};
|
||
|
|
self.primary_cred = cred;
|
||
|
|
self.secondary_cred = None;
|
||
|
|
}
|
||
|
|
// We favor starting over at level 1 to migrating to level
|
||
|
|
// 1, but if we have a level 4 credential for a bridge that
|
||
|
|
// hasn't been marked blocked, save the credential so we can
|
||
|
|
// migrate to a level 2 cred. Note that second_level_up is
|
||
|
|
// only true if we were unable to connect with bridges from
|
||
|
|
// our primary credential.
|
||
|
|
else if second_level_up && (level <= MIN_TRUST_LEVEL || reachcred.is_none()) {
|
||
|
|
let second_cred = second_cred.as_ref().unwrap();
|
||
|
|
let cred = trust_migration(
|
||
|
|
&config.la_net,
|
||
|
|
&second_cred,
|
||
|
|
&trust_promotion(
|
||
|
|
&config.la_net,
|
||
|
|
&second_cred,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_migration_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?;
|
||
|
|
self.primary_cred = cred;
|
||
|
|
self.secondary_cred = None;
|
||
|
|
} else if can_migrate {
|
||
|
|
let cred = blockage_migration(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
&check_blockage(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_migration_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?;
|
||
|
|
self.primary_cred = cred;
|
||
|
|
self.secondary_cred = None;
|
||
|
|
} else if second_cred.is_some() {
|
||
|
|
// Couldn't connect with primary credential
|
||
|
|
if succeeded.len() > 0 {
|
||
|
|
// Keep the second credential only if it's useful
|
||
|
|
self.secondary_cred = second_cred;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if negative_reports.len() > 0 {
|
||
|
|
Self::send_negative_reports(&config, negative_reports).await?;
|
||
|
|
}
|
||
|
|
if positive_reports.len() > 0 {
|
||
|
|
Self::send_positive_reports(&config, positive_reports).await?;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Invite friends if applicable
|
||
|
|
let invitations = match scalar_u32(&self.primary_cred.invites_remaining) {
|
||
|
|
Some(v) => v,
|
||
|
|
None => 0, // This is probably an error case that should not happen
|
||
|
|
};
|
||
|
|
let mut new_friends = Vec::<User>::new();
|
||
|
|
for _i in 0..min(invitations, num_users_requesting_invites) {
|
||
|
|
if event_happens(config.prob_user_invites_friend) {
|
||
|
|
// Invite non-censor friend
|
||
|
|
match self.invite(&config, censor, false).await {
|
||
|
|
Ok(friend) => {
|
||
|
|
// You really shouldn't push your friends,
|
||
|
|
// especially new ones whose boundaries you
|
||
|
|
// might not know well.
|
||
|
|
new_friends.push(friend);
|
||
|
|
}
|
||
|
|
Err(e) => {
|
||
|
|
println!("{}", e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Invite censor users if applicable
|
||
|
|
let invitations = invitations - new_friends.len() as u32;
|
||
|
|
for _i in 0..min(invitations, num_censor_invites) {
|
||
|
|
if event_happens(config.prob_user_invites_friend) {
|
||
|
|
// Invite non-censor friend
|
||
|
|
match self.invite(&config, censor, true).await {
|
||
|
|
Ok(friend) => {
|
||
|
|
new_friends.push(friend);
|
||
|
|
}
|
||
|
|
Err(e) => {
|
||
|
|
println!("{}", e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(new_friends)
|
||
|
|
} else {
|
||
|
|
Ok(Vec::<User>::new())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// User cooperates with censor and performs daily tasks to try to
|
||
|
|
// learn more bridges.
|
||
|
|
pub async fn daily_tasks_censor(
|
||
|
|
&mut self,
|
||
|
|
config: &Config,
|
||
|
|
bridges: &mut HashMap<[u8; 20], Bridge>,
|
||
|
|
censor: &mut Censor,
|
||
|
|
) -> Result<Vec<User>> {
|
||
|
|
// Download bucket to see if bridge is still reachable and if we
|
||
|
|
// have any new bridges
|
||
|
|
let (bucket, reachcred) = get_bucket(&config.la_net, &self.primary_cred).await?;
|
||
|
|
let level = scalar_u32(&self.primary_cred.trust_level).unwrap();
|
||
|
|
|
||
|
|
// Make sure each bridge is in global bridges set and known by
|
||
|
|
// censor
|
||
|
|
for bridgeline in bucket {
|
||
|
|
if bridgeline != BridgeLine::default() {
|
||
|
|
if !bridges.contains_key(&bridgeline.get_hashed_fingerprint()) {
|
||
|
|
let bridge = Bridge::from_bridge_line(&bridgeline);
|
||
|
|
bridges.insert(bridgeline.get_hashed_fingerprint(), bridge);
|
||
|
|
}
|
||
|
|
censor.learn_bridge(&bridgeline.get_hashed_fingerprint());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Censor user tries to level up their primary credential
|
||
|
|
if reachcred.is_some() {
|
||
|
|
if level == 0 && eligible_for_trust_promotion(&config.la_net, &self.primary_cred).await
|
||
|
|
|| level > 0 && eligible_for_level_up(&config.la_net, &self.primary_cred).await
|
||
|
|
{
|
||
|
|
let new_cred = if level == 0 {
|
||
|
|
trust_migration(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
&trust_promotion(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?,
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_migration_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?
|
||
|
|
} else {
|
||
|
|
level_up(
|
||
|
|
&config.la_net,
|
||
|
|
&self.primary_cred,
|
||
|
|
&reachcred.unwrap(),
|
||
|
|
get_lox_pub(&config.la_pubkeys),
|
||
|
|
get_reachability_pub(&config.la_pubkeys),
|
||
|
|
)
|
||
|
|
.await?
|
||
|
|
};
|
||
|
|
self.primary_cred = new_cred;
|
||
|
|
let (bucket, _reachcred) = get_bucket(&config.la_net, &self.primary_cred).await?;
|
||
|
|
// Make sure each bridge is in global bridges set and
|
||
|
|
// known by censor
|
||
|
|
for bl in bucket {
|
||
|
|
let fingerprint = bl.get_hashed_fingerprint();
|
||
|
|
if !bridges.contains_key(&fingerprint) {
|
||
|
|
let bridge = Bridge::from_bridge_line(&bl);
|
||
|
|
bridges.insert(fingerprint, bridge);
|
||
|
|
}
|
||
|
|
censor.learn_bridge(&fingerprint);
|
||
|
|
censor.give_lox_cred(&fingerprint, &self.primary_cred);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// LA has identified this bucket as blocked. This change
|
||
|
|
// will not be reverted, so replace the primary credential
|
||
|
|
// with a new level 0 credential and work on gaining trust
|
||
|
|
// for that one.
|
||
|
|
let res = Self::get_new_credential(&config).await;
|
||
|
|
if res.is_ok() {
|
||
|
|
let (new_cred, bl) = res.unwrap();
|
||
|
|
let fingerprint = bl.get_hashed_fingerprint();
|
||
|
|
if !bridges.contains_key(&fingerprint) {
|
||
|
|
let bridge = Bridge::from_bridge_line(&bl);
|
||
|
|
bridges.insert(fingerprint, bridge);
|
||
|
|
}
|
||
|
|
censor.learn_bridge(&fingerprint);
|
||
|
|
// Censor doesn't want new_cred yet
|
||
|
|
self.primary_cred = new_cred;
|
||
|
|
} else {
|
||
|
|
eprintln!("Censor failed to get new credential");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Separately from primary credential, censor user requests a
|
||
|
|
// new secondary credential each day just to block the
|
||
|
|
// open-entry bridges. This is stored but not reused.
|
||
|
|
let res = Self::get_new_credential(&config).await;
|
||
|
|
if res.is_ok() {
|
||
|
|
let (_new_cred, bl) = res.unwrap();
|
||
|
|
let fingerprint = bl.get_hashed_fingerprint();
|
||
|
|
if !bridges.contains_key(&fingerprint) {
|
||
|
|
let bridge = Bridge::from_bridge_line(&bl);
|
||
|
|
bridges.insert(fingerprint, bridge);
|
||
|
|
}
|
||
|
|
censor.learn_bridge(&fingerprint);
|
||
|
|
// Censor doesn't want new_cred. User doesn't actually use
|
||
|
|
// secondary_cred, so don't store it.
|
||
|
|
} else {
|
||
|
|
eprintln!("Censor failed to get new credential");
|
||
|
|
}
|
||
|
|
|
||
|
|
// Censor user invites as many censor friends as possible
|
||
|
|
let invitations = scalar_u32(&self.primary_cred.invites_remaining).unwrap();
|
||
|
|
let mut new_friends = Vec::<User>::new();
|
||
|
|
for _ in 0..invitations {
|
||
|
|
match self.invite(&config, censor, true).await {
|
||
|
|
Ok(friend) => {
|
||
|
|
new_friends.push(friend);
|
||
|
|
}
|
||
|
|
Err(e) => {
|
||
|
|
println!("{}", e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
Ok(new_friends)
|
||
|
|
}
|
||
|
|
}
|