[PATCH v5 06/12] crypto: index encrypted parts when indexopts try_decrypt is set.
Daniel Kahn Gillmor
dkg at fifthhorseman.net
Sat Oct 14 23:48:01 PDT 2017
If we see index options that ask us to decrypt when indexing a
message, and we encounter an encrypted part, we'll try to descend into
it.
If we can decrypt, we add the property index.decryption=success.
If we can't decrypt (or recognize the encrypted type of mail), we add
the property index.decryption=failure.
Note that a single message may have both values of the
"index-decryption" property: "success" and "failure". For example,
consider a message that includes multiple layers of encryption. If we
manage to decrypt the outer layer ("index.decryption=success"), but
fail on the inner layer ("index.decryption=failure").
Because of the property name, this will be automatically cleared (and
possibly re-set) during re-indexing. This means it will subsequently
correspond to the actual semantics of the stored index.
---
lib/add-message.cc | 2 +-
lib/index.cc | 91 ++++++++++++++++++++++++++++++++++++++++++++++-----
lib/message.cc | 4 +--
lib/notmuch-private.h | 1 +
4 files changed, 86 insertions(+), 12 deletions(-)
diff --git a/lib/add-message.cc b/lib/add-message.cc
index 34099ed5..f5fac8be 100644
--- a/lib/add-message.cc
+++ b/lib/add-message.cc
@@ -546,7 +546,7 @@ notmuch_database_index_file (notmuch_database_t *notmuch,
indexopts = def_indexopts;
}
- ret = _notmuch_message_index_file (message, message_file);
+ ret = _notmuch_message_index_file (message, indexopts, message_file);
if (ret)
goto DONE;
diff --git a/lib/index.cc b/lib/index.cc
index e5ae2ba7..6e684f5f 100644
--- a/lib/index.cc
+++ b/lib/index.cc
@@ -364,9 +364,15 @@ _index_content_type (notmuch_message_t *message, GMimeObject *part)
}
}
+static void
+_index_encrypted_mime_part (notmuch_message_t *message, notmuch_indexopts_t *indexopts,
+ GMimeContentType *content_type,
+ GMimeMultipartEncrypted *part);
+
/* Callback to generate terms for each mime part of a message. */
static void
_index_mime_part (notmuch_message_t *message,
+ notmuch_indexopts_t *indexopts,
GMimeObject *part)
{
GMimeStream *stream, *filter;
@@ -385,6 +391,7 @@ _index_mime_part (notmuch_message_t *message,
}
_index_content_type (message, part);
+ content_type = g_mime_object_get_content_type (part);
if (GMIME_IS_MULTIPART (part)) {
GMimeMultipart *multipart = GMIME_MULTIPART (part);
@@ -409,17 +416,21 @@ _index_mime_part (notmuch_message_t *message,
}
}
if (GMIME_IS_MULTIPART_ENCRYPTED (multipart)) {
- /* Don't index encrypted parts, but index their content type. */
_index_content_type (message,
g_mime_multipart_get_part (multipart, i));
- if ((i != GMIME_MULTIPART_ENCRYPTED_VERSION) &&
- (i != GMIME_MULTIPART_ENCRYPTED_CONTENT)) {
- _notmuch_database_log (_notmuch_message_database (message),
- "Warning: Unexpected extra parts of multipart/encrypted.\n");
+ if (i == GMIME_MULTIPART_ENCRYPTED_CONTENT) {
+ _index_encrypted_mime_part(message, indexopts,
+ content_type,
+ GMIME_MULTIPART_ENCRYPTED (part));
+ } else {
+ if (i != GMIME_MULTIPART_ENCRYPTED_VERSION) {
+ _notmuch_database_log (_notmuch_message_database (message),
+ "Warning: Unexpected extra parts of multipart/encrypted.\n");
+ }
}
continue;
}
- _index_mime_part (message,
+ _index_mime_part (message, indexopts,
g_mime_multipart_get_part (multipart, i));
}
return;
@@ -430,7 +441,7 @@ _index_mime_part (notmuch_message_t *message,
mime_message = g_mime_message_part_get_message (GMIME_MESSAGE_PART (part));
- _index_mime_part (message, g_mime_message_get_mime_part (mime_message));
+ _index_mime_part (message, indexopts, g_mime_message_get_mime_part (mime_message));
return;
}
@@ -464,7 +475,6 @@ _index_mime_part (notmuch_message_t *message,
filter = g_mime_stream_filter_new (stream);
- content_type = g_mime_object_get_content_type (part);
discard_non_term_filter = notmuch_filter_discard_non_term_new (content_type);
g_mime_stream_filter_add (GMIME_STREAM_FILTER (filter),
@@ -502,8 +512,71 @@ _index_mime_part (notmuch_message_t *message,
}
}
+/* descend (if desired) into the cleartext part of an encrypted MIME
+ * part while indexing. */
+static void
+_index_encrypted_mime_part (notmuch_message_t *message,
+ notmuch_indexopts_t *indexopts,
+ g_mime_3_unused(GMimeContentType *content_type),
+ GMimeMultipartEncrypted *encrypted_data)
+{
+ notmuch_status_t status;
+ GError *err = NULL;
+ notmuch_database_t * notmuch = NULL;
+ GMimeObject *clear = NULL;
+
+ if (!indexopts || !notmuch_indexopts_get_try_decrypt (indexopts))
+ return;
+
+ notmuch = _notmuch_message_database (message);
+
+#if (GMIME_MAJOR_VERSION < 3)
+ {
+ GMimeCryptoContext* crypto_ctx = NULL;
+ const char *protocol = NULL;
+ protocol = g_mime_content_type_get_parameter (content_type, "protocol");
+ status = _notmuch_crypto_get_gmime_ctx_for_protocol (&(indexopts->crypto),
+ protocol, &crypto_ctx);
+ if (status) {
+ _notmuch_database_log (notmuch, "Warning: setup failed for decrypting "
+ "during indexing. (%d)\n", status);
+ status = notmuch_message_add_property (message, "index.decryption", "failure");
+ if (status)
+ _notmuch_database_log_append (notmuch, "failed to add index.decryption "
+ "property (%d)\n", status);
+ return;
+ }
+ clear = g_mime_multipart_encrypted_decrypt(encrypted_data, crypto_ctx,
+ NULL, &err);
+ }
+#else
+ clear = g_mime_multipart_encrypted_decrypt(encrypted_data, GMIME_DECRYPT_NONE, NULL,
+ NULL, &err);
+#endif
+ if (err) {
+ _notmuch_database_log (notmuch, "Failed to decrypt during indexing. (%d:%d) [%s]\n",
+ err->domain, err->code, err->message);
+ g_error_free(err);
+ /* Indicate that we failed to decrypt during indexing */
+ status = notmuch_message_add_property (message, "index.decryption", "failure");
+ if (status)
+ _notmuch_database_log_append (notmuch, "failed to add index.decryption "
+ "property (%d)\n", status);
+ return;
+ }
+ _index_mime_part (message, indexopts, clear);
+ g_object_unref (clear);
+
+ status = notmuch_message_add_property (message, "index.decryption", "success");
+ if (status)
+ _notmuch_database_log (notmuch, "failed to add index.decryption "
+ "property (%d)\n", status);
+
+}
+
notmuch_status_t
_notmuch_message_index_file (notmuch_message_t *message,
+ notmuch_indexopts_t *indexopts,
notmuch_message_file_t *message_file)
{
GMimeMessage *mime_message;
@@ -531,7 +604,7 @@ _notmuch_message_index_file (notmuch_message_t *message,
subject = g_mime_message_get_subject (mime_message);
_notmuch_message_gen_terms (message, "subject", subject);
- _index_mime_part (message, g_mime_message_get_mime_part (mime_message));
+ _index_mime_part (message, indexopts, g_mime_message_get_mime_part (mime_message));
return NOTMUCH_STATUS_SUCCESS;
}
diff --git a/lib/message.cc b/lib/message.cc
index 77bb6c76..a47590c6 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -1961,7 +1961,7 @@ _notmuch_message_frozen (notmuch_message_t *message)
notmuch_status_t
notmuch_message_reindex (notmuch_message_t *message,
- notmuch_indexopts_t unused (*indexopts))
+ notmuch_indexopts_t *indexopts)
{
notmuch_database_t *notmuch = NULL;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
@@ -2044,7 +2044,7 @@ notmuch_message_reindex (notmuch_message_t *message,
if (found == 0)
_notmuch_message_set_header_values (message, date, from, subject);
- ret = _notmuch_message_index_file (message, message_file);
+ ret = _notmuch_message_index_file (message, indexopts, message_file);
if (ret == NOTMUCH_STATUS_FILE_ERROR)
continue;
diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 4c408396..1093429c 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -448,6 +448,7 @@ _notmuch_database_link_message_to_parents (notmuch_database_t *notmuch,
notmuch_status_t
_notmuch_message_index_file (notmuch_message_t *message,
+ notmuch_indexopts_t *indexopts,
notmuch_message_file_t *message_file);
/* messages.c */
--
2.14.2
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