X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=util%2Fcrypto.c;h=225f537a0b55e331433d7371f18a8874a69d33e0;hp=3f8ac25a0cd952eb5e62dddf2ce3ef2b556cc693;hb=b23902a61158ecdbca2d9d96c6eaf509d6e3d205;hpb=74919c226eafad4de6b3a823f83a8be970e77e24

diff --git a/util/crypto.c b/util/crypto.c
index 3f8ac25a..225f537a 100644
--- a/util/crypto.c
+++ b/util/crypto.c
@@ -24,7 +24,8 @@
 
 #define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))
 
-void _notmuch_crypto_cleanup (unused(_notmuch_crypto_t *crypto))
+void
+_notmuch_crypto_cleanup (unused(_notmuch_crypto_t *crypto))
 {
 }
 
@@ -37,6 +38,7 @@ _notmuch_crypto_decrypt (bool *attempted,
 			 GError **err)
 {
     GMimeObject *ret = NULL;
+
     if (decrypt == NOTMUCH_DECRYPT_FALSE)
 	return NULL;
 
@@ -78,18 +80,20 @@ _notmuch_crypto_decrypt (bool *attempted,
     GMimeDecryptFlags flags = GMIME_DECRYPT_NONE;
     if (decrypt == NOTMUCH_DECRYPT_TRUE && decrypt_result)
 	flags |= GMIME_DECRYPT_EXPORT_SESSION_KEY;
-    ret = g_mime_multipart_encrypted_decrypt(part, flags, NULL,
-					     decrypt_result, err);
+    ret = g_mime_multipart_encrypted_decrypt (part, flags, NULL,
+					      decrypt_result, err);
     return ret;
 }
 
 static int
 _notmuch_message_crypto_destructor (_notmuch_message_crypto_t *msg_crypto)
 {
-    if (!msg_crypto)
+    if (! msg_crypto)
 	return 0;
     if (msg_crypto->sig_list)
 	g_object_unref (msg_crypto->sig_list);
+    if (msg_crypto->payload_subject)
+	talloc_free (msg_crypto->payload_subject);
     return 0;
 }
 
@@ -97,6 +101,7 @@ _notmuch_message_crypto_t *
 _notmuch_message_crypto_new (void *ctx)
 {
     _notmuch_message_crypto_t *ret = talloc_zero (ctx, _notmuch_message_crypto_t);
+
     talloc_set_destructor (ret, _notmuch_message_crypto_destructor);
     return ret;
 }
@@ -104,7 +109,7 @@ _notmuch_message_crypto_new (void *ctx)
 notmuch_status_t
 _notmuch_message_crypto_potential_sig_list (_notmuch_message_crypto_t *msg_crypto, GMimeSignatureList *sigs)
 {
-    if (!msg_crypto)
+    if (! msg_crypto)
 	return NOTMUCH_STATUS_NULL_POINTER;
 
     /* Signatures that arrive after a payload part during DFS are not
@@ -133,7 +138,11 @@ _notmuch_message_crypto_potential_sig_list (_notmuch_message_crypto_t *msg_crypt
 notmuch_status_t
 _notmuch_message_crypto_potential_payload (_notmuch_message_crypto_t *msg_crypto, GMimeObject *payload, GMimeObject *parent, int childnum)
 {
-    if (!msg_crypto || !payload)
+    const char *protected_headers = NULL;
+    const char *forwarded = NULL;
+    const char *subject = NULL;
+
+    if (! msg_crypto || ! payload)
 	return NOTMUCH_STATUS_NULL_POINTER;
 
     /* only fire on the first payload part encountered */
@@ -156,6 +165,37 @@ _notmuch_message_crypto_potential_payload (_notmuch_message_crypto_t *msg_crypto
 
     msg_crypto->payload_encountered = true;
 
+    /* don't bother recording anything if there is no cryptographic
+     * envelope: */
+    if ((msg_crypto->decryption_status != NOTMUCH_MESSAGE_DECRYPTED_FULL) &&
+	(msg_crypto->sig_list == NULL))
+	return NOTMUCH_STATUS_SUCCESS;
+
+    /* Verify that this payload has headers that are intended to be
+     * exported to the larger message: */
+
+    /* Consider a payload that uses Alexei Melinkov's forwarded="no" for
+     * message/global or message/rfc822:
+     * https://tools.ietf.org/html/draft-melnikov-smime-header-signing-05#section-4 */
+    forwarded = g_mime_object_get_content_type_parameter (payload, "forwarded");
+    if (GMIME_IS_MESSAGE_PART (payload) && forwarded && strcmp (forwarded, "no") == 0) {
+	GMimeMessage *message = g_mime_message_part_get_message (GMIME_MESSAGE_PART (payload));
+	subject = g_mime_message_get_subject (message);
+	/* FIXME: handle more than just Subject: at some point */
+    } else {
+	/* Consider "memoryhole"-style protected headers as practiced by Enigmail and K-9 */
+	protected_headers = g_mime_object_get_content_type_parameter (payload, "protected-headers");
+	if (protected_headers && strcasecmp ("v1", protected_headers) == 0)
+	    subject = g_mime_object_get_header (payload, "Subject");
+	/* FIXME: handle more than just Subject: at some point */
+    }
+
+    if (subject) {
+	if (msg_crypto->payload_subject)
+	    talloc_free (msg_crypto->payload_subject);
+	msg_crypto->payload_subject = talloc_strdup (msg_crypto, subject);
+    }
+
     return NOTMUCH_STATUS_SUCCESS;
 }
 
@@ -163,12 +203,12 @@ _notmuch_message_crypto_potential_payload (_notmuch_message_crypto_t *msg_crypto
 notmuch_status_t
 _notmuch_message_crypto_successful_decryption (_notmuch_message_crypto_t *msg_crypto)
 {
-    if (!msg_crypto)
+    if (! msg_crypto)
 	return NOTMUCH_STATUS_NULL_POINTER;
 
     /* see the rationale for different values of
      * _notmuch_message_decryption_status_t in util/crypto.h */
-    if (!msg_crypto->payload_encountered)
+    if (! msg_crypto->payload_encountered)
 	msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_FULL;
     else if (msg_crypto->decryption_status == NOTMUCH_MESSAGE_DECRYPTED_NONE)
 	msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_PARTIAL;