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profanity/src/tools/aesgcm_download.c

193 lines
6.7 KiB
C

/*
* aesgcm_download.c
* vim: expandtab:ts=4:sts=4:sw=4
*
* Copyright (C) 2012 - 2019 James Booth <boothj5@gmail.com>
* Copyright (C) 2020 William Wennerström <william@wstrm.dev>
*
* This file is part of Profanity.
*
* Profanity 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.
*
* Profanity 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 Profanity. If not, see <https://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give permission to
* link the code of portions of this program with the OpenSSL library under
* certain conditions as described in each individual source file, and
* distribute linked combinations including the two.
*
* You must obey the GNU General Public License in all respects for all of the
* code used other than OpenSSL. If you modify file(s) with this exception, you
* may extend this exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this exception
* statement from your version. If you delete this exception statement from all
* source files in the program, then also delete it here.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <curl/curl.h>
#include <gio/gio.h>
#include <pthread.h>
#include <assert.h>
#include <errno.h>
#include "profanity.h"
#include "event/client_events.h"
#include "tools/http_common.h"
#include "tools/aesgcm_download.h"
#include "omemo/omemo.h"
#include "config/preferences.h"
#include "ui/ui.h"
#include "ui/window.h"
#include "common.h"
#define FALLBACK_MSG ""
void*
aesgcm_file_get(void* userdata)
{
AESGCMDownload* aesgcm_dl = (AESGCMDownload*)userdata;
char* https_url = NULL;
char* fragment = NULL;
// Convert the aesgcm:// URL to a https:// URL and extract the encoded key
// and tag stored in the URL fragment.
if (omemo_parse_aesgcm_url(aesgcm_dl->url, &https_url, &fragment) != 0) {
cons_show_error("Download failed: Cannot parse URL '%s'.", aesgcm_dl->url);
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Download failed: Cannot parse URL '%s'.",
aesgcm_dl->url);
return NULL;
}
// Create a temporary file used for storing the ciphertext that is to be
// retrieved from the https:// URL.
gchar* tmpname = NULL;
gint tmpfd;
if ((tmpfd = g_file_open_tmp("profanity.XXXXXX", &tmpname, NULL)) == -1) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Downloading '%s' failed: Unable to create "
"temporary ciphertext file for writing "
"(%s).",
https_url, g_strerror(errno));
return NULL;
}
// Open the target file for storing the cleartext.
FILE* outfh = fopen(aesgcm_dl->filename, "wb");
if (outfh == NULL) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Downloading '%s' failed: Unable to open "
"output file at '%s' for writing (%s).",
https_url, aesgcm_dl->filename,
g_strerror(errno));
return NULL;
}
// We wrap the HTTPDownload tool and use it for retrieving the ciphertext
// and storing it in the temporary file previously opened.
HTTPDownload* http_dl = malloc(sizeof(HTTPDownload));
http_dl->window = aesgcm_dl->window;
http_dl->worker = aesgcm_dl->worker;
http_dl->id = strdup(aesgcm_dl->id);
http_dl->url = strdup(https_url);
http_dl->filename = strdup(tmpname);
http_dl->cmd_template = NULL;
http_dl->silent = FALSE;
aesgcm_dl->http_dl = http_dl;
http_file_get(http_dl); // TODO(wstrm): Verify result.
FILE* tmpfh = fopen(tmpname, "rb");
if (tmpfh == NULL) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Downloading '%s' failed: Unable to open "
"temporary file at '%s' for reading (%s).",
aesgcm_dl->url, tmpname,
g_strerror(errno));
return NULL;
}
gcry_error_t crypt_res;
crypt_res = omemo_decrypt_file(tmpfh, outfh,
http_dl->bytes_received, fragment);
if (fclose(tmpfh) == EOF) {
cons_show_error(g_strerror(errno));
}
close(tmpfd);
remove(tmpname);
g_free(tmpname);
if (crypt_res != GPG_ERR_NO_ERROR) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Downloading '%s' failed: Failed to decrypt "
"file (%s).",
https_url, gcry_strerror(crypt_res));
}
if (fclose(outfh) == EOF) {
cons_show_error(g_strerror(errno));
}
free(https_url);
free(fragment);
if (aesgcm_dl->cmd_template != NULL) {
gchar** argv = format_call_external_argv(aesgcm_dl->cmd_template,
aesgcm_dl->filename,
aesgcm_dl->filename);
// TODO: Log the error.
if (!call_external(argv)) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->id,
"Downloading '%s' failed: Unable to call "
"command '%s' with file at '%s' (%s).",
aesgcm_dl->url,
aesgcm_dl->cmd_template,
aesgcm_dl->filename,
"TODO: Log the error");
}
g_strfreev(argv);
free(aesgcm_dl->cmd_template);
}
free(aesgcm_dl->id);
free(aesgcm_dl->filename);
free(aesgcm_dl->url);
free(aesgcm_dl);
return NULL;
}
void
aesgcm_download_cancel_processes(ProfWin* window)
{
http_download_cancel_processes(window);
}
void
aesgcm_download_add_download(AESGCMDownload* aesgcm_dl)
{
http_download_add_download(aesgcm_dl->http_dl);
}