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Fix ticket 178: Don't use a NetDir until we have microdescriptors for all of our primary guards.
Closes #178
See merge request tpo/core/arti!220
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We need this information to know if it's okay to migrate to a new
NetDir, or if we need to download more information first.
Part of #178.
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If we don't know a current microdescriptor for a guard, we can't use it
for multihop circuits, since we don't know its onion keys.
This is part of a fix for #178.
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I found these versions empirically, by using the following process:
First, I used `cargo tree --depth 1 --kind all` to get a list of
every immediate dependency we had.
Then, I used `cargo upgrade --workspace package@version` to change
each dependency to the earliest version with which (in theory) the
current version is semver-compatible. IOW, if the current version
was 3.2.3, I picked "3". If the current version was 0.12.8, I
picked "0.12".
Then, I used `cargo +nightly upgrade -Z minimal-versions` to
downgrade Cargo.lock to the minimal listed version for each
dependency. (I had to override a few packages; see .gitlab-ci.yml
for details).
Finally, I repeatedly increased the version of each of our
dependencies until our code compiled and the tests passed. Here's
what I found that we need:
anyhow >= 1.0.5: Earlier versions break our hyper example.
async-broadcast >= 0.3.2: Earlier versions fail our tests.
async-compression 0.3.5: Earlier versions handled futures and tokio
differently.
async-trait >= 0.1.2: Earlier versions are too buggy to compile our
code.
clap 2.33.0: For Arg::default_value_os().
coarsetime >= 0.1.20: exposed as_ticks() function.
curve25519-dalek >= 3.2: For is_identity().
generic-array 0.14.3: Earlier versions don't implement
From<&[T; 32]>
httparse >= 1.2: Earlier versions didn't implement Error.
itertools at 0.10.1: For at_most_once.
rusqlite >= 0.26.3: for backward compatibility with older rustc.
serde 1.0.103: Older versions break our code.
serde_json >= 1.0.50: Since we need its Value type to implement Eq.
shellexpand >= 2.1: To avoid a broken dirs crate version.
tokio >= 1.4: For Handle::block_on().
tracing >= 0.1.18: Previously, tracing_core and tracing had separate
LevelFilter types.
typenum >= 1.12: Compatibility with rust-crypto crates
x25519-dalek >= 1.2.0: For was_contributory().
Closes #275.
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`tor-rtcompat`'s `TlsConnector` trait previously included a method to
create a TLS-over-TCP connection, which implied creating a TCP stream
inside that method. This commit changes that, and makes the function
wrap a TCP stream, as returned from the runtime's `TcpProvider` trait
implementation, instead.
This means you can actually override `TcpProvider` and have it apply to
*all* connections Arti makes, which is useful for issues like arti#235
and other cases where you want to have a custom TCP stream
implementation.
This required updating the mock TCP/TLS types in `tor-rtmock` slightly;
due to the change in API, we now store whether a `LocalStream` should
actually be a TLS stream inside the stream itself, and check this
property on reads/writes in order to detect misuse. The fake TLS wrapper
checks this property and removes it in order to "wrap" the stream,
making reads and writes work again.
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Squash, refactor, and test !139 (Don't use same family as exit when picking a guard)
Closes #183
See merge request tpo/core/arti!173
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This approach saves us from a linear search when picking guards.
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There's not much reason to use a HashSet here, since we're just
going over the whole list.
This reverts commit 16e8489abbea1581b8e2 and does a little more
refactoring.
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We want to only use TODO in the codebase for non-blockers, and open
tickets for anything that is a bigger blocker than a TODO. These
XXXXs seem like definite non-blockers to me.
Part of arti#231.
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Also fix some commonwealth spellings that had slipped in.
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Rust nightly claims that Vec might get its own retain_mut method,
which would potentially conflict with the extension method we've
grabbed from the retain_mut crate. To solve this, we're calling the
method explicitly.
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params
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To do this at all neatly, I had to split out `tor-config` from
`arti-config` again, and putting the lower level stuff (paths,
builder errors) into tor-config. I also changed our use of
derive_builder to always use a common error type, to avoid
error type proliferation.
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This is based on @eta's patches for !118 and !119: Since we already
have an unbounded channel, we don't need to use an elaborate mess of
one-shot senders. We can just use the unbounded_send() method,
which also lets us enqueue a message without having to await.
Closes #219.
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We define "coming back online" as happening when a guard attempt
succeeds, if that attempt that was launched when we seemed to be
offline.
We define "seeming to be offline" as having all of our primary
guards marked unreachable, and having received no incoming network
traffic in a while.
Closes #216.
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Instead of putting a fully qualified name in the text, in most cases
we should just use the short name of the type or function we're
referring to.
In other words, instead of saying [`crate::module::Foo`], we should
typically say [`Foo`](crate::module::Foo).
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The Futureproof<T> type lets you serialize and deserialize types whose
representations might change (most useful for enums that might grow
additional variants). It uses #[serde(untagged)] to accomplish this.
This gets used in order to make the `disabled` field of `Guard` more
robust against future guard disablement reasons being added.
A test was also added to verify correct behaviour of the new type.
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As per arti#175, we'd like to be able to handle newer Arti versions
storing additional state in the persisted state files, without dropping
this data on the floor when we write out changes to these files.
Use the #[serde(flatten)] mechanism to achieve this, by adding catch-all
HashMap<String, JsonValue> fields to all structs that are at risk of
this happening to them.
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I'm not sure what I was thinking here.
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We must not apply our new path-bias behavior (where we blame a guard
if it gives us too many indeterminate circuit failures) if the path
was not chosen at random. If too many random paths fail, we know
that's suspicious, since the other relays are a random sample. But
if a bunch of user-provided paths fail, that could simply be because
the user's chosen exit is down.
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We now track, for every guard: the total number of successful
circuits we've built through it, along with the total number of
"indeterminate" circuits.
Recall that a circuit's status is "indeterminate" if it has failed
for a reason that _might_ be the guard's fault, or might not be the
guard's fault. For example, if extending to the second hop of the
circuit fails, we have no way to know whether the guard deliberately
refused to connect there, or whether the second hop is just offline.
But we don't want to forgive all indeterminate circuit failures: if
we did, then a malicious guard could simply reject any second hops
that it didn't like, thereby filtering the client into a chosen
set of circuits.
As a stopgap solution, this patch now makes guards become
permanently disabled if the fraction of their circuit failures
becomes too high.
See also general-purpose path bias selection (arti#65), and Mike's
idea for changing the guard reachability definition (torspec#67).
This patch doesn't do either of those.
Closes #185.
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Closes #202.
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