Struct tor_hsservice::replay::ReplayLog
source · pub(crate) struct ReplayLog {
seen: Filter,
file: Option<PersistFile>,
}
Expand description
A probabilistic data structure to record fingerprints of observed Introduce2 messages.
We need to record these fingerprints to prevent replay attacks; see the module documentation for an explanation of why that would be bad.
A ReplayLog should correspond to a KP_hss_ntor
key, and should have the
same lifespan: dropping it sooner will enable replays, but dropping it later
will waste disk and memory.
False positives are allowed, to conserve on space.
Fields§
§seen: Filter
The inner probabilistic data structure.
file: Option<PersistFile>
Persistent state file etc., if we’re persistent
If is is None
, this RelayLog is ephemeral.
Implementations§
source§impl ReplayLog
impl ReplayLog
sourcepub(crate) fn new_ephemeral() -> Self
pub(crate) fn new_ephemeral() -> Self
Create a new ReplayLog not backed by any data storage.
sourcepub(crate) fn new_logged(
dir: &InstanceRawSubdir,
lid: &IptLocalId
) -> Result<Self, CreateIptError>
pub(crate) fn new_logged( dir: &InstanceRawSubdir, lid: &IptLocalId ) -> Result<Self, CreateIptError>
Create a ReplayLog backed by the file at a given path.
If the file already exists, load its contents and append any new contents to it; otherwise, create the file.
lock
must already have been locked and this
cannot be assured by the type system.
§Limitations
It is the caller’s responsibility to make sure that there are never two
ReplayLogs
open at once for the same path, or for two paths that
resolve to the same file.
sourcefn new_logged_inner(
path: impl AsRef<Path>,
lock: Arc<LockFileGuard>
) -> Result<Self>
fn new_logged_inner( path: impl AsRef<Path>, lock: Arc<LockFileGuard> ) -> Result<Self>
Inner function for new_logged
, with reified arguments and raw error type
sourcefn truncate_to_multiple(file: &mut File, current_len: u64) -> Result<()>
fn truncate_to_multiple(file: &mut File, current_len: u64) -> Result<()>
Truncate file
to contain a whole number of records
current_len
should have come from file.metadata()
.
sourcepub(crate) fn check_for_replay(
&mut self,
introduce: &Introduce2
) -> Result<(), ReplayError>
pub(crate) fn check_for_replay( &mut self, introduce: &Introduce2 ) -> Result<(), ReplayError>
Test whether we have already seen introduce
.
If we have seen it, return Err(ReplayError::AlreadySeen)
. (Since this
is a probabilistic data structure, there is a chance of returning this
error even if we have we have not seen this particular message)
Otherwise, return Ok(())
.
sourcefn check_inner(&mut self, h: &H) -> Result<(), ReplayError>
fn check_inner(&mut self, h: &H) -> Result<(), ReplayError>
Implementation helper: test whether we have already seen h
.
Return values are as for check_for_replay
sourcepub(crate) fn parse_log_leafname(
leaf: &OsStr
) -> Result<(IptLocalId, &str), Cow<'static, str>>
pub(crate) fn parse_log_leafname( leaf: &OsStr ) -> Result<(IptLocalId, &str), Cow<'static, str>>
Tries to parse a filename in the replay logs directory
If the leafname refers to a file that would be created by
ReplayLog::new_logged
, returns the IptLocalId
.
Otherwise returns an error explaining why it isn’t, as a plain string (for logging).
Auto Trait Implementations§
impl Freeze for ReplayLog
impl RefUnwindSafe for ReplayLog
impl Send for ReplayLog
impl Sync for ReplayLog
impl Unpin for ReplayLog
impl UnwindSafe for ReplayLog
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