1 files changed, 120 insertions, 0 deletions
diff --git a/third_party/rust/neqo-crypto/src/cert.rs b/third_party/rust/neqo-crypto/src/cert.rs
new file mode 100644
index 0000000000..64e63ec71a
--- /dev/null
+++ b/third_party/rust/neqo-crypto/src/cert.rs
@@ -0,0 +1,120 @@
+// 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.
+
+use std::{
+    convert::TryFrom,
+    ptr::{addr_of, NonNull},
+    slice,
+};
+
+use neqo_common::qerror;
+
+use crate::{
+    err::secstatus_to_res,
+    p11::{CERTCertListNode, CERT_GetCertificateDer, CertList, Item, SECItem, SECItemArray},
+    ssl::{
+        PRFileDesc, SSL_PeerCertificateChain, SSL_PeerSignedCertTimestamps,
+        SSL_PeerStapledOCSPResponses,
+    },
+};
+
+pub struct CertificateInfo {
+    certs: CertList,
+    cursor: *const CERTCertListNode,
+    /// stapled_ocsp_responses and signed_cert_timestamp are properties
+    /// associated with each of the certificates. Right now, NSS only
+    /// reports the value for the end-entity certificate (the first).
+    stapled_ocsp_responses: Option<Vec<Vec<u8>>>,
+    signed_cert_timestamp: Option<Vec<u8>>,
+}
+
+fn peer_certificate_chain(fd: *mut PRFileDesc) -> Option<(CertList, *const CERTCertListNode)> {
+    let chain = unsafe { SSL_PeerCertificateChain(fd) };
+    CertList::from_ptr(chain.cast()).ok().map(|certs| {
+        let cursor = CertificateInfo::head(&certs);
+        (certs, cursor)
+    })
+}
+
+// As explained in rfc6961, an OCSPResponseList can have at most
+// 2^24 items. Casting its length is therefore safe even on 32 bits targets.
+fn stapled_ocsp_responses(fd: *mut PRFileDesc) -> Option<Vec<Vec<u8>>> {
+    let ocsp_nss = unsafe { SSL_PeerStapledOCSPResponses(fd) };
+    match NonNull::new(ocsp_nss as *mut SECItemArray) {
+        Some(ocsp_ptr) => {
+            let mut ocsp_helper: Vec<Vec<u8>> = Vec::new();
+            let Ok(len) = isize::try_from(unsafe { ocsp_ptr.as_ref().len }) else {
+                qerror!([format!("{fd:p}")], "Received illegal OSCP length");
+                return None;
+            };
+            for idx in 0..len {
+                let itemp: *const SECItem = unsafe { ocsp_ptr.as_ref().items.offset(idx).cast() };
+                let item = unsafe { slice::from_raw_parts((*itemp).data, (*itemp).len as usize) };
+                ocsp_helper.push(item.to_owned());
+            }
+            Some(ocsp_helper)
+        }
+        None => None,
+    }
+}
+
+fn signed_cert_timestamp(fd: *mut PRFileDesc) -> Option<Vec<u8>> {
+    let sct_nss = unsafe { SSL_PeerSignedCertTimestamps(fd) };
+    match NonNull::new(sct_nss as *mut SECItem) {
+        Some(sct_ptr) => {
+            if unsafe { sct_ptr.as_ref().len == 0 || sct_ptr.as_ref().data.is_null() } {
+                Some(Vec::new())
+            } else {
+                let sct_slice = unsafe {
+                    slice::from_raw_parts(sct_ptr.as_ref().data, sct_ptr.as_ref().len as usize)
+                };
+                Some(sct_slice.to_owned())
+            }
+        }
+        None => None,
+    }
+}
+
+impl CertificateInfo {
+    pub(crate) fn new(fd: *mut PRFileDesc) -> Option<Self> {
+        peer_certificate_chain(fd).map(|(certs, cursor)| Self {
+            certs,
+            cursor,
+            stapled_ocsp_responses: stapled_ocsp_responses(fd),
+            signed_cert_timestamp: signed_cert_timestamp(fd),
+        })
+    }
+
+    fn head(certs: &CertList) -> *const CERTCertListNode {
+        // Three stars: one for the reference, one for the wrapper, one to deference the pointer.
+        unsafe { addr_of!((***certs).list).cast() }
+    }
+}
+
+impl<'a> Iterator for &'a mut CertificateInfo {
+    type Item = &'a [u8];
+    fn next(&mut self) -> Option<&'a [u8]> {
+        self.cursor = unsafe { *self.cursor }.links.next.cast();
+        if self.cursor == CertificateInfo::head(&self.certs) {
+            return None;
+        }
+        let mut item = Item::make_empty();
+        let cert = unsafe { *self.cursor }.cert;
+        secstatus_to_res(unsafe { CERT_GetCertificateDer(cert, &mut item) })
+            .expect("getting DER from certificate should work");
+        Some(unsafe { std::slice::from_raw_parts(item.data, item.len as usize) })
+    }
+}
+
+impl CertificateInfo {
+    pub fn stapled_ocsp_responses(&mut self) -> &Option<Vec<Vec<u8>>> {
+        &self.stapled_ocsp_responses
+    }
+
+    pub fn signed_cert_timestamp(&mut self) -> &Option<Vec<u8>> {
+        &self.signed_cert_timestamp
+    }
+}