Merge branch 'maint-0.3.3' into release-0.3.3
This commit is contained in:
commit
f177ec2142
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@ -0,0 +1,6 @@
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o Major bugfixes (security, directory authority, denial-of-service):
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- Fix a bug that could have allowed an attacker to force a
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directory authority to use up all its RAM by passing it a
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maliciously crafted protocol versions string. Fixes bug 25517;
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bugfix on 0.2.9.4-alpha. This issue is also tracked as
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TROVE-2018-005.
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@ -2963,6 +2963,12 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_t *private_key,
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microdescriptors = smartlist_new();
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SMARTLIST_FOREACH_BEGIN(routers, routerinfo_t *, ri) {
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/* If it has a protover list and contains a protocol name greater than
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* MAX_PROTOCOL_NAME_LENGTH, skip it. */
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if (ri->protocol_list &&
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protover_contains_long_protocol_names(ri->protocol_list)) {
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continue;
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}
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if (ri->cache_info.published_on >= cutoff) {
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routerstatus_t *rs;
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vote_routerstatus_t *vrs;
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@ -53,6 +53,11 @@ static const struct {
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#define N_PROTOCOL_NAMES ARRAY_LENGTH(PROTOCOL_NAMES)
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/* Maximum allowed length of any single subprotocol name. */
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// C_RUST_COUPLED: src/rust/protover/protover.rs
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// `MAX_PROTOCOL_NAME_LENGTH`
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static const uint MAX_PROTOCOL_NAME_LENGTH = 100;
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/**
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* Given a protocol_type_t, return the corresponding string used in
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* descriptors.
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@ -198,6 +203,15 @@ parse_single_entry(const char *s, const char *end_of_entry)
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if (equals == s)
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goto error;
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/* The name must not be longer than MAX_PROTOCOL_NAME_LENGTH. */
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if (equals - s > MAX_PROTOCOL_NAME_LENGTH) {
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log_warn(LD_NET, "When parsing a protocol entry, I got a very large "
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"protocol name. This is possibly an attack or a bug, unless "
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"the Tor network truly supports protocol names larger than "
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"%ud characters. The offending string was: %s",
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MAX_PROTOCOL_NAME_LENGTH, escaped(out->name));
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goto error;
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}
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out->name = tor_strndup(s, equals-s);
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tor_assert(equals < end_of_entry);
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@ -262,6 +276,18 @@ parse_protocol_list(const char *s)
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return NULL;
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}
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/**
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* Return true if the unparsed protover in <b>s</b> would contain a protocol
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* name longer than MAX_PROTOCOL_NAME_LENGTH, and false otherwise.
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*/
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bool
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protover_contains_long_protocol_names(const char *s)
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{
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if (!parse_protocol_list(s))
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return true;
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return false;
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}
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/**
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* Given a protocol type and version number, return true iff we know
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* how to speak that protocol.
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@ -439,6 +465,14 @@ expand_protocol_list(const smartlist_t *protos)
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SMARTLIST_FOREACH_BEGIN(protos, const proto_entry_t *, ent) {
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const char *name = ent->name;
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if (strlen(name) > MAX_PROTOCOL_NAME_LENGTH) {
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log_warn(LD_NET, "When expanding a protocol entry, I got a very large "
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"protocol name. This is possibly an attack or a bug, unless "
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"the Tor network truly supports protocol names larger than "
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"%ud characters. The offending string was: %s",
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MAX_PROTOCOL_NAME_LENGTH, escaped(name));
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continue;
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}
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SMARTLIST_FOREACH_BEGIN(ent->ranges, const proto_range_t *, range) {
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uint32_t u;
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for (u = range->low; u <= range->high; ++u) {
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@ -10,7 +10,7 @@
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#define TOR_PROTOVER_H
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#include "container.h"
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#include <stdbool.h>
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/** The first version of Tor that included "proto" entries in its
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* descriptors. Authorities should use this to decide whether to
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* guess proto lines. */
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@ -42,6 +42,7 @@ typedef enum protocol_type_t {
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PRT_CONS,
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} protocol_type_t;
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bool protover_contains_long_protocol_names(const char *s);
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int protover_all_supported(const char *s, char **missing);
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int protover_is_supported_here(protocol_type_t pr, uint32_t ver);
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const char *protover_get_supported_protocols(void);
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@ -59,7 +59,8 @@ pub extern "C" fn protover_all_supported(
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Err(_) => return 1,
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};
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let relay_proto_entry: UnvalidatedProtoEntry = match relay_version.parse() {
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let relay_proto_entry: UnvalidatedProtoEntry =
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match UnvalidatedProtoEntry::from_str_any_len(relay_version) {
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Ok(n) => n,
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Err(_) => return 1,
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};
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@ -181,6 +182,7 @@ pub extern "C" fn protover_get_supported_protocols() -> *const c_char {
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pub extern "C" fn protover_compute_vote(
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list: *const Stringlist,
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threshold: c_int,
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allow_long_proto_names: bool,
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) -> *mut c_char {
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if list.is_null() {
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@ -195,9 +197,13 @@ pub extern "C" fn protover_compute_vote(
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let mut proto_entries: Vec<UnvalidatedProtoEntry> = Vec::new();
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for datum in data {
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let entry: UnvalidatedProtoEntry = match datum.parse() {
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Ok(x) => x,
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Err(_) => continue,
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let entry: UnvalidatedProtoEntry = match allow_long_proto_names {
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true => match UnvalidatedProtoEntry::from_str_any_len(datum.as_str()) {
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Ok(n) => n,
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Err(_) => continue},
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false => match datum.parse() {
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Ok(n) => n,
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Err(_) => continue},
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};
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proto_entries.push(entry);
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}
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@ -28,6 +28,9 @@ const FIRST_TOR_VERSION_TO_ADVERTISE_PROTOCOLS: &'static str = "0.2.9.3-alpha";
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/// C_RUST_COUPLED: src/or/protover.c `MAX_PROTOCOLS_TO_EXPAND`
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const MAX_PROTOCOLS_TO_EXPAND: usize = (1<<16);
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/// The maximum size an `UnknownProtocol`'s name may be.
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pub(crate) const MAX_PROTOCOL_NAME_LENGTH: usize = 100;
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/// Currently supported protocols and their versions, as a byte-slice.
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///
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/// # Warning
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@ -114,6 +117,18 @@ impl FromStr for UnknownProtocol {
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type Err = ProtoverError;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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if s.len() <= MAX_PROTOCOL_NAME_LENGTH {
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Ok(UnknownProtocol(s.to_string()))
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} else {
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Err(ProtoverError::ExceedsNameLimit)
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}
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}
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}
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impl UnknownProtocol {
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/// Create an `UnknownProtocol`, ignoring whether or not it
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/// exceeds MAX_PROTOCOL_NAME_LENGTH.
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fn from_str_any_len(s: &str) -> Result<Self, ProtoverError> {
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Ok(UnknownProtocol(s.to_string()))
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}
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}
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@ -428,6 +443,49 @@ impl UnvalidatedProtoEntry {
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};
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supported_versions.iter().any(|v| v.1 >= *vers)
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}
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/// Split a string containing (potentially) several protocols and their
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/// versions into a `Vec` of tuples of string in `(protocol, versions)`
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/// form.
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///
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/// # Inputs
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///
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/// A &str in the form `"Link=3-4 Cons=5"`.
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///
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/// # Returns
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///
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/// A `Result` whose `Ok` variant is a `Vec<(&str, &str)>` of `(protocol,
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/// versions)`, or whose `Err` variant is a `ProtoverError`.
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///
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/// # Errors
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///
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/// This will error with a `ProtoverError::Unparseable` if any of the
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/// following are true:
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///
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/// * If a protocol name is an empty string, e.g. `"Cons=1,3 =3-5"`.
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/// * If a protocol name cannot be parsed as utf-8.
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/// * If the version numbers are an empty string, e.g. `"Cons="`.
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fn parse_protocol_and_version_str<'a>(protocol_string: &'a str)
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-> Result<Vec<(&'a str, &'a str)>, ProtoverError>
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{
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let mut protovers: Vec<(&str, &str)> = Vec::new();
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for subproto in protocol_string.split(' ') {
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let mut parts = subproto.splitn(2, '=');
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let name = match parts.next() {
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Some("") => return Err(ProtoverError::Unparseable),
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Some(n) => n,
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None => return Err(ProtoverError::Unparseable),
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};
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let vers = match parts.next() {
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Some(n) => n,
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None => return Err(ProtoverError::Unparseable),
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};
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protovers.push((name, vers));
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}
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Ok(protovers)
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}
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}
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impl FromStr for UnvalidatedProtoEntry {
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@ -460,19 +518,10 @@ impl FromStr for UnvalidatedProtoEntry {
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/// * If the version string is malformed. See `impl FromStr for ProtoSet`.
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fn from_str(protocol_string: &str) -> Result<UnvalidatedProtoEntry, ProtoverError> {
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let mut parsed: UnvalidatedProtoEntry = UnvalidatedProtoEntry::default();
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let parts: Vec<(&str, &str)> =
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UnvalidatedProtoEntry::parse_protocol_and_version_str(protocol_string)?;
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for subproto in protocol_string.split(' ') {
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let mut parts = subproto.splitn(2, '=');
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let name = match parts.next() {
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Some("") => return Err(ProtoverError::Unparseable),
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Some(n) => n,
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None => return Err(ProtoverError::Unparseable),
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};
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let vers = match parts.next() {
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Some(n) => n,
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None => return Err(ProtoverError::Unparseable),
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};
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for &(name, vers) in parts.iter() {
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let versions = ProtoSet::from_str(vers)?;
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let protocol = UnknownProtocol::from_str(name)?;
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@ -482,6 +531,26 @@ impl FromStr for UnvalidatedProtoEntry {
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}
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}
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impl UnvalidatedProtoEntry {
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/// Create an `UnknownProtocol`, ignoring whether or not it
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/// exceeds MAX_PROTOCOL_NAME_LENGTH.
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pub(crate) fn from_str_any_len(protocol_string: &str)
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-> Result<UnvalidatedProtoEntry, ProtoverError>
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{
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let mut parsed: UnvalidatedProtoEntry = UnvalidatedProtoEntry::default();
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let parts: Vec<(&str, &str)> =
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UnvalidatedProtoEntry::parse_protocol_and_version_str(protocol_string)?;
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for &(name, vers) in parts.iter() {
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let versions = ProtoSet::from_str(vers)?;
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let protocol = UnknownProtocol::from_str_any_len(name)?;
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parsed.insert(protocol, versions);
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}
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Ok(parsed)
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}
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}
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/// Pretend a `ProtoEntry` is actually an `UnvalidatedProtoEntry`.
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impl From<ProtoEntry> for UnvalidatedProtoEntry {
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fn from(proto_entry: ProtoEntry) -> UnvalidatedProtoEntry {
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@ -125,6 +125,13 @@ test_protover_parse_fail(void *arg)
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/* Broken range */
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elts = parse_protocol_list("Link=1,9-8,3");
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tt_ptr_op(elts, OP_EQ, NULL);
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/* Protocol name too long */
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elts = parse_protocol_list("DoSaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
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tt_ptr_op(elts, OP_EQ, NULL);
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#endif
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done:
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;
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@ -219,6 +226,15 @@ test_protover_vote(void *arg)
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tt_str_op(result, OP_EQ, "");
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tor_free(result);
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/* Protocol name too long */
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smartlist_clear(lst);
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smartlist_add(lst, (void*) "DoSaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
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result = protover_compute_vote(lst, 1);
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tt_str_op(result, OP_EQ, "");
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tor_free(result);
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done:
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tor_free(result);
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smartlist_free(lst);
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@ -300,6 +316,15 @@ test_protover_all_supported(void *arg)
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tt_assert(protover_all_supported("Sleen=0-4294967295", &msg));
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tor_end_capture_bugs_();
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/* Protocol name too long */
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tor_capture_bugs_(1);
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tt_assert(protover_all_supported(
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"DoSaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaa=1-65536", &msg));
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tor_end_capture_bugs_();
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done:
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tor_end_capture_bugs_();
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tor_free(msg);
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