Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 238 insertions, 0 deletions

diff --git a/third_party/rust/neqo-http3/src/settings.rs b/third_party/rust/neqo-http3/src/settings.rs
new file mode 100644
index 0000000000..8bcdbd8db1
--- /dev/null
+++ b/third_party/rust/neqo-http3/src/settings.rs
@@ -0,0 +1,238 @@
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(clippy::module_name_repetitions)]
+
+use crate::{Error, Http3Parameters, Res};
+use neqo_common::{Decoder, Encoder};
+use neqo_crypto::{ZeroRttCheckResult, ZeroRttChecker};
+use std::ops::Deref;
+
+type SettingsType = u64;
+
+/// Increment this version number if a new setting is added and that might
+/// cause 0-RTT to be accepted where shouldn't be.
+const SETTINGS_ZERO_RTT_VERSION: u64 = 1;
+
+const SETTINGS_MAX_HEADER_LIST_SIZE: SettingsType = 0x6;
+const SETTINGS_QPACK_MAX_TABLE_CAPACITY: SettingsType = 0x1;
+const SETTINGS_QPACK_BLOCKED_STREAMS: SettingsType = 0x7;
+const SETTINGS_ENABLE_WEB_TRANSPORT: SettingsType = 0x2b60_3742;
+
+pub const H3_RESERVED_SETTINGS: &[SettingsType] = &[0x2, 0x3, 0x4, 0x5];
+
+#[derive(Clone, PartialEq, Eq, Debug, Copy)]
+pub enum HSettingType {
+    MaxHeaderListSize,
+    MaxTableCapacity,
+    BlockedStreams,
+    EnableWebTransport,
+}
+
+fn hsetting_default(setting_type: HSettingType) -> u64 {
+    match setting_type {
+        HSettingType::MaxHeaderListSize => 1 << 62,
+        HSettingType::MaxTableCapacity
+        | HSettingType::BlockedStreams
+        | HSettingType::EnableWebTransport => 0,
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct HSetting {
+    pub setting_type: HSettingType,
+    pub value: u64,
+}
+
+impl HSetting {
+    #[must_use]
+    pub fn new(setting_type: HSettingType, value: u64) -> Self {
+        Self {
+            setting_type,
+            value,
+        }
+    }
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct HSettings {
+    settings: Vec<HSetting>,
+}
+
+impl HSettings {
+    #[must_use]
+    pub fn new(settings: &[HSetting]) -> Self {
+        Self {
+            settings: settings.to_vec(),
+        }
+    }
+
+    #[must_use]
+    pub fn get(&self, setting: HSettingType) -> u64 {
+        match self.settings.iter().find(|s| s.setting_type == setting) {
+            Some(v) => v.value,
+            None => hsetting_default(setting),
+        }
+    }
+
+    pub fn encode_frame_contents(&self, enc: &mut Encoder) {
+        enc.encode_vvec_with(|enc_inner| {
+            for iter in &self.settings {
+                match iter.setting_type {
+                    HSettingType::MaxHeaderListSize => {
+                        enc_inner.encode_varint(SETTINGS_MAX_HEADER_LIST_SIZE as u64);
+                        enc_inner.encode_varint(iter.value);
+                    }
+                    HSettingType::MaxTableCapacity => {
+                        enc_inner.encode_varint(SETTINGS_QPACK_MAX_TABLE_CAPACITY as u64);
+                        enc_inner.encode_varint(iter.value);
+                    }
+                    HSettingType::BlockedStreams => {
+                        enc_inner.encode_varint(SETTINGS_QPACK_BLOCKED_STREAMS as u64);
+                        enc_inner.encode_varint(iter.value);
+                    }
+                    HSettingType::EnableWebTransport => {
+                        enc_inner.encode_varint(SETTINGS_ENABLE_WEB_TRANSPORT as u64);
+                        enc_inner.encode_varint(iter.value);
+                    }
+                }
+            }
+        });
+    }
+
+    /// # Errors
+    /// Returns an error if settings types are reserved of settings value are not permitted.
+    pub fn decode_frame_contents(&mut self, dec: &mut Decoder) -> Res<()> {
+        while dec.remaining() > 0 {
+            let t = dec.decode_varint();
+            let v = dec.decode_varint();
+
+            if let Some(settings_type) = t {
+                if H3_RESERVED_SETTINGS.contains(&settings_type) {
+                    return Err(Error::HttpSettings);
+                }
+            }
+            match (t, v) {
+                (Some(SETTINGS_MAX_HEADER_LIST_SIZE), Some(value)) => self
+                    .settings
+                    .push(HSetting::new(HSettingType::MaxHeaderListSize, value)),
+                (Some(SETTINGS_QPACK_MAX_TABLE_CAPACITY), Some(value)) => self
+                    .settings
+                    .push(HSetting::new(HSettingType::MaxTableCapacity, value)),
+                (Some(SETTINGS_QPACK_BLOCKED_STREAMS), Some(value)) => self
+                    .settings
+                    .push(HSetting::new(HSettingType::BlockedStreams, value)),
+                (Some(SETTINGS_ENABLE_WEB_TRANSPORT), Some(value)) => {
+                    if value > 1 {
+                        return Err(Error::HttpSettings);
+                    }
+                    self.settings
+                        .push(HSetting::new(HSettingType::EnableWebTransport, value));
+                }
+                // other supported settings here
+                (Some(_), Some(_)) => {} // ignore unknown setting, it is fine.
+                _ => return Err(Error::NotEnoughData),
+            };
+        }
+        Ok(())
+    }
+}
+
+impl Deref for HSettings {
+    type Target = [HSetting];
+    fn deref(&self) -> &Self::Target {
+        &self.settings
+    }
+}
+
+impl From<&Http3Parameters> for HSettings {
+    fn from(conn_param: &Http3Parameters) -> Self {
+        Self {
+            settings: vec![
+                HSetting {
+                    setting_type: HSettingType::MaxTableCapacity,
+                    value: conn_param.get_max_table_size_decoder(),
+                },
+                HSetting {
+                    setting_type: HSettingType::BlockedStreams,
+                    value: u64::from(conn_param.get_max_blocked_streams()),
+                },
+                HSetting {
+                    setting_type: HSettingType::EnableWebTransport,
+                    value: u64::from(conn_param.get_webtransport()),
+                },
+            ],
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct HttpZeroRttChecker {
+    settings: Http3Parameters,
+}
+
+impl HttpZeroRttChecker {
+    /// Right now we only have QPACK settings, so that is all this takes.
+    #[must_use]
+    pub fn new(settings: Http3Parameters) -> Self {
+        Self { settings }
+    }
+
+    /// Save the settings that matter for 0-RTT.
+    #[must_use]
+    pub fn save(settings: &Http3Parameters) -> Vec<u8> {
+        let mut enc = Encoder::new();
+        enc.encode_varint(SETTINGS_ZERO_RTT_VERSION)
+            .encode_varint(SETTINGS_QPACK_MAX_TABLE_CAPACITY)
+            .encode_varint(settings.get_max_table_size_decoder())
+            .encode_varint(SETTINGS_QPACK_BLOCKED_STREAMS)
+            .encode_varint(settings.get_max_blocked_streams())
+            .encode_varint(SETTINGS_ENABLE_WEB_TRANSPORT)
+            .encode_varint(settings.get_webtransport());
+        enc.into()
+    }
+}
+
+impl ZeroRttChecker for HttpZeroRttChecker {
+    fn check(&self, token: &[u8]) -> ZeroRttCheckResult {
+        let mut dec = Decoder::from(token);
+
+        // Read and check the version.
+        if let Some(version) = dec.decode_varint() {
+            if version != SETTINGS_ZERO_RTT_VERSION {
+                return ZeroRttCheckResult::Reject;
+            }
+        } else {
+            return ZeroRttCheckResult::Fail;
+        }
+
+        // Now treat the rest as a settings frame.
+        let mut settings = HSettings::new(&[]);
+        if settings.decode_frame_contents(&mut dec).is_err() {
+            return ZeroRttCheckResult::Fail;
+        }
+        if settings.iter().all(|setting| match setting.setting_type {
+            HSettingType::BlockedStreams => {
+                u64::from(self.settings.get_max_blocked_streams()) >= setting.value
+            }
+            HSettingType::MaxTableCapacity => {
+                self.settings.get_max_table_size_decoder() >= setting.value
+            }
+            HSettingType::EnableWebTransport => {
+                if setting.value > 0 {
+                    return false;
+                }
+                let value = setting.value == 1;
+                self.settings.get_webtransport() || !value
+            }
+            HSettingType::MaxHeaderListSize => true,
+        }) {
+            ZeroRttCheckResult::Accept
+        } else {
+            ZeroRttCheckResult::Reject
+        }
+    }
+}