fix: Switch to EncryptionPreference::Mutual on a receipt of encrypted…

…+signed message (#4707)

src/mimeparser.rs

@@ -376,6 +376,12 @@ impl MimeMessage {
         if !encrypted {
             signatures.clear();
         }
+        if let Some(peerstate) = &mut decryption_info.peerstate {
+            if peerstate.prefer_encrypt != EncryptPreference::Mutual && !signatures.is_empty() {
+                peerstate.prefer_encrypt = EncryptPreference::Mutual;
+                peerstate.save_to_db(&context.sql).await?;
+            }
+        }
 
         // Auto-submitted is also set by holiday-notices so we also check `chat-version`
         let is_bot = headers.contains_key("auto-submitted") && headers.contains_key("chat-version");

src/receive_imf/tests.rs

@@ -3117,6 +3117,46 @@ async fn test_thunderbird_autocrypt() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_prefer_encrypt_mutual_if_encrypted() -> Result<()> {
+    let t = TestContext::new_bob().await;
+
+    let raw =
+        include_bytes!("../../test-data/message/thunderbird_encrypted_signed_with_pubkey.eml");
+    receive_imf(&t, raw, false).await?;
+    let peerstate = Peerstate::from_addr(&t, "[email protected]")
+        .await?
+        .unwrap();
+    assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Mutual);
+
+    receive_imf(
+        &t,
+        b"From: [email protected]\n\
+          To: [email protected]\n\
+          Subject: foo\n\
+          Message-ID: <[email protected]>\n\
+          Date: Thu, 2 Nov 2023 02:20:28 -0300\n\
+          \n\
+          unencrypted\n",
+        false,
+    )
+    .await?;
+    let peerstate = Peerstate::from_addr(&t, "[email protected]")
+        .await?
+        .unwrap();
+    assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Reset);
+
+    let raw = include_bytes!("../../test-data/message/thunderbird_encrypted_signed.eml");
+    receive_imf(&t, raw, false).await?;
+    let peerstate = Peerstate::from_addr(&t, "[email protected]")
+        .await?
+        .unwrap();
+    assert!(peerstate.public_key.is_some());
+    assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Mutual);
+
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_thunderbird_autocrypt_unencrypted() -> Result<()> {
     let t = TestContext::new_bob().await;

test-data/message/thunderbird_encrypted_signed.eml

@@ -0,0 +1,80 @@
+From - Thu, 02 Nov 2023 05:25:44 GMT
+X-Mozilla-Status: 0801
+X-Mozilla-Status2: 00000000
+Message-ID: <[email protected]>
+Date: Thu, 2 Nov 2023 02:25:44 -0300
+MIME-Version: 1.0
+User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
+ Thunderbird/102.13.0
+Content-Language: en-US
+To: [email protected]
+From: Alice <[email protected]>
+X-Mozilla-Draft-Info: internal/draft; vcard=0; receipt=0; DSN=0; uuencode=0;
+ attachmentreminder=0; deliveryformat=0
+X-Identity-Key: id3
+Fcc: imap://alice%[email protected]/Sent
+Subject: ...
+Content-Type: multipart/encrypted;
+ protocol="application/pgp-encrypted";
+ boundary="------------ODMSY6iRxlSk4uG4zIxjzLbw"
+
+This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156)
+--------------ODMSY6iRxlSk4uG4zIxjzLbw
+Content-Type: application/pgp-encrypted
+Content-Description: PGP/MIME version identification
+
+Version: 1
+
+--------------ODMSY6iRxlSk4uG4zIxjzLbw
+Content-Type: application/octet-stream; name="encrypted.asc"
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc"
+
+-----BEGIN PGP MESSAGE-----
+
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+d+EkgKXHfQVfohZhSg==
+=u1yY
+-----END PGP MESSAGE-----
+
+--------------ODMSY6iRxlSk4uG4zIxjzLbw--

test-data/message/thunderbird_encrypted_signed_with_pubkey.eml

@@ -0,0 +1,165 @@
+From - Thu, 02 Nov 2023 05:20:27 GMT
+X-Mozilla-Status: 0801
+X-Mozilla-Status2: 00000000
+Message-ID: <[email protected]>
+Date: Thu, 2 Nov 2023 02:20:27 -0300
+MIME-Version: 1.0
+User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
+ Thunderbird/102.13.0
+Content-Language: en-US
+To: [email protected]
+From: Alice <[email protected]>
+Autocrypt: addr=[email protected]; keydata=
+ xsDNBGOaGzQBDADCFtBNMHRDJQRkd2tNm7CJm1Yo3Y5r3qP6v0FSwP1BIHbiIf0E/jFiKZWj
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+X-Mozilla-Draft-Info: internal/draft; vcard=0; receipt=0; DSN=0; uuencode=0;
+ attachmentreminder=0; deliveryformat=0
+X-Identity-Key: id3
+Fcc: imap://alice%[email protected]/Sent
+Subject: ...
+Content-Type: multipart/encrypted;
+ protocol="application/pgp-encrypted";
+ boundary="------------vm4cgC4UBxQhCLFg6Vv0nrTd"
+
+This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156)
+--------------vm4cgC4UBxQhCLFg6Vv0nrTd
+Content-Type: application/pgp-encrypted
+Content-Description: PGP/MIME version identification
+
+Version: 1
+
+--------------vm4cgC4UBxQhCLFg6Vv0nrTd
+Content-Type: application/octet-stream; name="encrypted.asc"
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc"
+
+-----BEGIN PGP MESSAGE-----
+
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+-----END PGP MESSAGE-----
+
+--------------vm4cgC4UBxQhCLFg6Vv0nrTd--