Backport: Allow additionally parsing \r newlines in PEM files

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustls-pemfile"
-version = "1.0.3"
+version = "1.0.4"
 edition = "2018"
 license = "Apache-2.0 OR ISC OR MIT"
 readme = "README.md"

README.md

@@ -9,6 +9,8 @@ poor and doing so doesn't address a meaningful threat model.
 [![Documentation](https://docs.rs/rustls-pemfile/badge.svg)](https://docs.rs/rustls-pemfile/)
 
 # Release history
+- 1.0.4 (2023-11-09)
+  * Enable parsing PEM files with items that have non-UNIX line endings.
 - 1.0.3 (2023-06-28)
   * Add certificate revocation list (CRL) format support.
   * Add `crls` helper function.

src/pemfile.rs

@@ -48,7 +48,7 @@ pub fn read_one(rd: &mut dyn io::BufRead) -> Result<Option<Item>, io::Error> {
 
     loop {
         line.clear();
-        let len = rd.read_until(b'\n', &mut line)?;
+        let len = read_until_newline(rd, &mut line)?;
 
         if len == 0 {
             // EOF
@@ -124,6 +124,43 @@ pub fn read_one(rd: &mut dyn io::BufRead) -> Result<Option<Item>, io::Error> {
     }
 }
 
+// Ported from https://github.com/rust-lang/rust/blob/91cfcb021935853caa06698b759c293c09d1e96a/library/std/src/io/mod.rs#L1990 and
+// modified to look for our accepted newlines.
+fn read_until_newline<R: io::BufRead + ?Sized>(
+    r: &mut R,
+    buf: &mut Vec<u8>,
+) -> std::io::Result<usize> {
+    let mut read = 0;
+    loop {
+        let (done, used) = {
+            let available = match r.fill_buf() {
+                Ok(n) => n,
+                Err(ref e) if e.kind() == ErrorKind::Interrupted => continue,
+                Err(e) => return Err(e),
+            };
+            match available
+                .iter()
+                .copied()
+                .position(|b| b == b'\n' || b == b'\r')
+            {
+                Some(i) => {
+                    buf.extend_from_slice(&available[..=i]);
+                    (true, i + 1)
+                }
+                None => {
+                    buf.extend_from_slice(available);
+                    (false, available.len())
+                }
+            }
+        };
+        r.consume(used);
+        read += used;
+        if done || used == 0 {
+            return Ok(read);
+        }
+    }
+}
+
 /// Extract and return all PEM sections by reading `rd`.
 pub fn read_all(rd: &mut dyn io::BufRead) -> Result<Vec<Item>, io::Error> {
     let mut v = Vec::<Item>::new();

tests/data/mixed-line-endings.crt

@@ -0,0 +1,41 @@
+-----BEGIN CERTIFICATE-----
+MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF
+ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE----------BEGIN CERTIFICATE-----
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tests/integration.rs

@@ -109,3 +109,35 @@ fn parse_in_order() {
     assert!(matches!(items[7], rustls_pemfile::Item::PKCS8Key(_)));
     assert!(matches!(items[8], rustls_pemfile::Item::Crl(_)));
 }
+
+#[test]
+fn different_line_endings() {
+    let data = include_bytes!("data/mixed-line-endings.crt");
+
+    // Ensure non-LF line endings are not lost by mistake, causing the test
+    // to silently regress.
+    let mut contained_unix_ending = false;
+    let mut contained_other_ending = false;
+    for byte in data.iter().copied() {
+        if contained_other_ending && contained_unix_ending {
+            break;
+        }
+
+        if byte == b'\n' {
+            contained_unix_ending = true;
+        } else if byte == b'\r' {
+            contained_other_ending = true;
+        }
+    }
+    assert!(contained_unix_ending);
+    assert!(contained_other_ending);
+
+    let mut reader = BufReader::new(&data[..]);
+
+    let items = rustls_pemfile::read_all(&mut reader).unwrap();
+
+    assert_eq!(items.len(), 4);
+    for cert in items {
+        assert!(matches!(cert, rustls_pemfile::Item::X509Certificate(_)));
+    }
+}