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| | /* notmuch - Not much of an email program, (just index and search)
*
* Copyright © 2012 Jameson Rollins
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see https://www.gnu.org/licenses/ .
*
* Authors: Jameson Rollins <jrollins@finestructure.net>
*/
#include "crypto.h"
#include <strings.h>
#define unused(x) x __attribute__ ((unused))
#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))
void _notmuch_crypto_cleanup (unused(_notmuch_crypto_t *crypto))
{
}
GMimeObject *
_notmuch_crypto_decrypt (bool *attempted,
notmuch_decryption_policy_t decrypt,
notmuch_message_t *message,
GMimeMultipartEncrypted *part,
GMimeDecryptResult **decrypt_result,
GError **err)
{
GMimeObject *ret = NULL;
if (decrypt == NOTMUCH_DECRYPT_FALSE)
return NULL;
/* try decryption with session key if one is stashed */
if (message) {
notmuch_message_properties_t *list = NULL;
for (list = notmuch_message_get_properties (message, "session-key", TRUE);
notmuch_message_properties_valid (list); notmuch_message_properties_move_to_next (list)) {
if (err && *err) {
g_error_free (*err);
*err = NULL;
}
if (attempted)
*attempted = true;
ret = g_mime_multipart_encrypted_decrypt (part,
GMIME_DECRYPT_NONE,
notmuch_message_properties_value (list),
decrypt_result, err);
if (ret)
break;
}
if (list)
notmuch_message_properties_destroy (list);
if (ret)
return ret;
}
if (err && *err) {
g_error_free (*err);
*err = NULL;
}
if (decrypt == NOTMUCH_DECRYPT_AUTO)
return ret;
if (attempted)
*attempted = true;
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);
return ret;
}
static int
_notmuch_message_crypto_destructor (_notmuch_message_crypto_t *msg_crypto)
{
if (!msg_crypto)
return 0;
if (msg_crypto->sig_list)
g_object_unref (msg_crypto->sig_list);
return 0;
}
_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;
}
notmuch_status_t
_notmuch_message_crypto_potential_sig_list (_notmuch_message_crypto_t *msg_crypto, GMimeSignatureList *sigs)
{
if (!msg_crypto)
return NOTMUCH_STATUS_NULL_POINTER;
/* Signatures that arrive after a payload part during DFS are not
* part of the cryptographic envelope: */
if (msg_crypto->payload_encountered)
return NOTMUCH_STATUS_SUCCESS;
if (msg_crypto->sig_list)
g_object_unref (msg_crypto->sig_list);
/* This signature list needs to persist as long as the _n_m_crypto
* object survives. Increasing its reference counter prevents
* garbage-collection until after _n_m_crypto_destroy is
* called. */
msg_crypto->sig_list = sigs;
if (sigs)
g_object_ref (sigs);
if (msg_crypto->decryption_status == NOTMUCH_MESSAGE_DECRYPTED_FULL)
msg_crypto->signature_encrypted = true;
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
_notmuch_message_crypto_potential_payload (_notmuch_message_crypto_t *msg_crypto, GMimeObject *payload, GMimeObject *parent, int childnum)
{
if (!msg_crypto || !payload)
return NOTMUCH_STATUS_NULL_POINTER;
/* only fire on the first payload part encountered */
if (msg_crypto->payload_encountered)
return NOTMUCH_STATUS_SUCCESS;
/* the first child of multipart/encrypted that matches the
* encryption protocol should be "control information" metadata,
* not payload. So we skip it. (see
* https://tools.ietf.org/html/rfc1847#page-8) */
if (parent && GMIME_IS_MULTIPART_ENCRYPTED (parent) && childnum == GMIME_MULTIPART_ENCRYPTED_VERSION) {
const char *enc_type = g_mime_object_get_content_type_parameter (parent, "protocol");
GMimeContentType *ct = g_mime_object_get_content_type (payload);
if (ct && enc_type) {
const char *part_type = g_mime_content_type_get_mime_type (ct);
if (part_type && strcmp (part_type, enc_type) == 0)
return NOTMUCH_STATUS_SUCCESS;
}
}
msg_crypto->payload_encountered = true;
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
_notmuch_message_crypto_successful_decryption (_notmuch_message_crypto_t *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)
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;
return NOTMUCH_STATUS_SUCCESS;
}
|