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/* notmuch - Not much of an email program, (just index and search)
*
* Copyright © 2009 Carl Worth
* Copyright © 2009 Keith Packard
*
* 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: Carl Worth <cworth@cworth.org>
* Keith Packard <keithp@keithp.com>
* Austin Clements <aclements@csail.mit.edu>
*/
#include "notmuch-client.h"
/* Context that gets inherited from the root node. */
typedef struct mime_node_context {
/* Per-message resources. These are allocated internally and must
* be destroyed. */
FILE *file;
GMimeStream *stream;
GMimeParser *parser;
GMimeMessage *mime_message;
/* Context provided by the caller. */
notmuch_crypto_t *crypto;
} mime_node_context_t;
static int
_mime_node_context_free (mime_node_context_t *res)
{
if (res->mime_message)
g_object_unref (res->mime_message);
if (res->parser)
g_object_unref (res->parser);
if (res->stream)
g_object_unref (res->stream);
if (res->file)
fclose (res->file);
return 0;
}
notmuch_status_t
mime_node_open (const void *ctx, notmuch_message_t *message,
notmuch_crypto_t *crypto, mime_node_t **root_out)
{
const char *filename = notmuch_message_get_filename (message);
mime_node_context_t *mctx;
mime_node_t *root;
notmuch_status_t status;
root = talloc_zero (ctx, mime_node_t);
if (root == NULL) {
fprintf (stderr, "Out of memory.\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
/* Create the tree-wide context */
mctx = talloc_zero (root, mime_node_context_t);
if (mctx == NULL) {
fprintf (stderr, "Out of memory.\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
talloc_set_destructor (mctx, _mime_node_context_free);
mctx->file = fopen (filename, "r");
if (! mctx->file) {
fprintf (stderr, "Error opening %s: %s\n", filename, strerror (errno));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
mctx->stream = g_mime_stream_file_new (mctx->file);
if (!mctx->stream) {
fprintf (stderr, "Out of memory.\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
g_mime_stream_file_set_owner (GMIME_STREAM_FILE (mctx->stream), FALSE);
mctx->parser = g_mime_parser_new_with_stream (mctx->stream);
if (!mctx->parser) {
fprintf (stderr, "Out of memory.\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
mctx->mime_message = g_mime_parser_construct_message (mctx->parser);
if (!mctx->mime_message) {
fprintf (stderr, "Failed to parse %s\n", filename);
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
mctx->crypto = crypto;
/* Create the root node */
root->part = GMIME_OBJECT (mctx->mime_message);
root->envelope_file = message;
root->nchildren = 1;
root->ctx = mctx;
root->parent = NULL;
root->part_num = 0;
root->next_child = 0;
root->next_part_num = 1;
*root_out = root;
return NOTMUCH_STATUS_SUCCESS;
DONE:
talloc_free (root);
return status;
}
/* Signature list destructor (GMime 2.6) */
static int
_signature_list_free (GMimeSignatureList **proxy)
{
g_object_unref (*proxy);
return 0;
}
/* Set up signature list destructor (GMime 2.6) */
static void
set_signature_list_destructor (mime_node_t *node)
{
GMimeSignatureList **proxy = talloc (node, GMimeSignatureList *);
if (proxy) {
*proxy = node->sig_list;
talloc_set_destructor (proxy, _signature_list_free);
}
}
/* Verify a signed mime node (GMime 2.6) */
static void
node_verify (mime_node_t *node, GMimeObject *part,
notmuch_crypto_context_t *cryptoctx)
{
GError *err = NULL;
node->verify_attempted = TRUE;
node->sig_list = g_mime_multipart_signed_verify
(GMIME_MULTIPART_SIGNED (part), cryptoctx, &err);
if (node->sig_list)
set_signature_list_destructor (node);
else
fprintf (stderr, "Failed to verify signed part: %s\n",
err ? err->message : "no error explanation given");
if (err)
g_error_free (err);
}
/* Decrypt and optionally verify an encrypted mime node (GMime 2.6) */
static void
node_decrypt_and_verify (mime_node_t *node, GMimeObject *part,
notmuch_crypto_context_t *cryptoctx)
{
GError *err = NULL;
GMimeDecryptResult *decrypt_result = NULL;
GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part);
node->decrypt_attempted = TRUE;
node->decrypted_child = g_mime_multipart_encrypted_decrypt
(encrypteddata, cryptoctx, &decrypt_result, &err);
if (! node->decrypted_child) {
fprintf (stderr, "Failed to decrypt part: %s\n",
err ? err->message : "no error explanation given");
goto DONE;
}
node->decrypt_success = TRUE;
node->verify_attempted = TRUE;
/* This may be NULL if the part is not signed. */
node->sig_list = g_mime_decrypt_result_get_signatures (decrypt_result);
if (node->sig_list) {
g_object_ref (node->sig_list);
set_signature_list_destructor (node);
}
g_object_unref (decrypt_result);
DONE:
if (err)
g_error_free (err);
}
static mime_node_t *
_mime_node_create (mime_node_t *parent, GMimeObject *part)
{
mime_node_t *node = talloc_zero (parent, mime_node_t);
notmuch_crypto_context_t *cryptoctx = NULL;
/* Set basic node properties */
node->part = part;
node->ctx = parent->ctx;
if (!talloc_reference (node, node->ctx)) {
fprintf (stderr, "Out of memory.\n");
talloc_free (node);
return NULL;
}
node->parent = parent;
node->part_num = node->next_part_num = -1;
node->next_child = 0;
/* Deal with the different types of parts */
if (GMIME_IS_PART (part)) {
node->nchildren = 0;
} else if (GMIME_IS_MULTIPART (part)) {
node->nchildren = g_mime_multipart_get_count (GMIME_MULTIPART (part));
} else if (GMIME_IS_MESSAGE_PART (part)) {
/* Promote part to an envelope and open it */
GMimeMessagePart *message_part = GMIME_MESSAGE_PART (part);
GMimeMessage *message = g_mime_message_part_get_message (message_part);
node->envelope_part = message_part;
node->part = GMIME_OBJECT (message);
node->nchildren = 1;
} else {
fprintf (stderr, "Warning: Unknown mime part type: %s.\n",
g_type_name (G_OBJECT_TYPE (part)));
talloc_free (node);
return NULL;
}
if ((GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt)
|| (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify)) {
GMimeContentType *content_type = g_mime_object_get_content_type (part);
const char *protocol = g_mime_content_type_get_parameter (content_type, "protocol");
cryptoctx = notmuch_crypto_get_context (node->ctx->crypto, protocol);
if (!cryptoctx)
return NULL;
}
/* Handle PGP/MIME parts */
if (GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt) {
if (node->nchildren != 2) {
/* this violates RFC 3156 section 4, so we won't bother with it. */
fprintf (stderr, "Error: %d part(s) for a multipart/encrypted "
"message (must be exactly 2)\n",
node->nchildren);
} else {
node_decrypt_and_verify (node, part, cryptoctx);
}
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