/*
 * Claws Mail -- a GTK based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2022 the Claws Mail team
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#include "claws-features.h"
#endif

#ifdef USE_GPGME

#include <time.h>
#include <gtk/gtk.h>
#include <gpgme.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#ifndef G_OS_WIN32
#  include <sys/wait.h>
#else
#  include <pthread.h>
#  include <windows.h>
#endif
#if (defined(__DragonFly__) || defined(SOLARIS) || defined (__NetBSD__) || defined (__FreeBSD__) || defined (__OpenBSD__))
#  include <sys/signal.h>
#endif
#ifndef G_OS_WIN32
#include <sys/mman.h>
#endif
#if HAVE_LOCALE_H
#  include <locale.h>
#endif

#include "sgpgme.h"
#include "privacy.h"
#include "prefs_common.h"
#include "utils.h"
#include "alertpanel.h"
#include "passphrase.h"
#include "prefs_gpg.h"
#include "account.h"
#include "select-keys.h"
#include "claws.h"
#include "file-utils.h"

static void sgpgme_disable_all(void)
{
    /* FIXME: set a flag, so that we don't bother the user with failed
     * gpgme messages */
}

void cm_free_detached_sig_task_data(gpointer data)
{
	DetachedSigTaskData *task_data = (DetachedSigTaskData *)data;

	g_free(task_data->boundary);
	g_free(task_data->text_filename);
	g_free(task_data->sig_filename);
	g_free(task_data);
}

void cm_check_detached_sig(GTask *task,
	gpointer source_object,
	gpointer _task_data,
	GCancellable *cancellable)
{
	DetachedSigTaskData *task_data = (DetachedSigTaskData *)_task_data;
	GQuark domain;
	FILE *fp;
	gpgme_ctx_t ctx;
	gpgme_error_t err;
	gpgme_data_t textdata = NULL;
	gpgme_data_t sigdata = NULL;
	gpgme_verify_result_t gpgme_res;
	gchar *textstr;
	gboolean return_err = TRUE;
	gboolean cancelled = FALSE;
	SigCheckTaskResult *task_result = NULL;
	char err_str[GPGERR_BUFSIZE] = "";

	domain = g_quark_from_static_string("claws_pgpcore");

	err = gpgme_new(&ctx);
	if (err != GPG_ERR_NO_ERROR) {
		gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
		g_warning("couldn't initialize GPG context: %s", err_str);
		goto out;
	}

	err = gpgme_set_protocol(ctx, task_data->protocol);
	if (err != GPG_ERR_NO_ERROR) {
		gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
		g_warning("couldn't set GPG protocol: %s", err_str);
		goto out_ctx;
	}

	fp = claws_fopen(task_data->text_filename, "rb");
	if (fp == NULL) {
		err = GPG_ERR_GENERAL;
		g_snprintf(err_str, GPGERR_BUFSIZE, "claws_fopen failed");
		goto out_ctx;
	}

	textstr = task_data->get_canonical_content(fp, task_data->boundary);
	claws_fclose(fp);

	err = gpgme_data_new_from_mem(&textdata, textstr, textstr?strlen(textstr):0, 0);
	if (err != GPG_ERR_NO_ERROR) {
		gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
		g_warning("gpgme_data_new_from_mem failed: %s", err_str);
		goto out_textstr;
	}

	fp = claws_fopen(task_data->sig_filename, "rb");
	if (fp == NULL) {
		err = GPG_ERR_GENERAL;
		g_snprintf(err_str, GPGERR_BUFSIZE, "claws_fopen failed");
		goto out_textdata;
	}

	err = gpgme_data_new_from_filepart(&sigdata, NULL, fp, task_data->sig_offset, task_data->sig_length);
	claws_fclose(fp);
	if (err != GPG_ERR_NO_ERROR) {
		gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
		g_warning("gpgme_data_new_from_filepart failed: %s", err_str);
		goto out_textdata;
	}

	if (task_data->sig_encoding == ENC_BASE64) {
		err = gpgme_data_set_encoding(sigdata, GPGME_DATA_ENCODING_BASE64);
		if (err != GPG_ERR_NO_ERROR) {
			gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
			g_warning("gpgme_data_set_encoding failed: %s\n", err_str);
			goto out_sigdata;
		}
	}

	if (g_task_return_error_if_cancelled(task)) {
		debug_print("task was cancelled, aborting task:%p\n", task);
		cancelled = TRUE;
		goto out_sigdata;
	}

	err = gpgme_op_verify(ctx, sigdata, textdata, NULL);
	if (err != GPG_ERR_NO_ERROR) {
		gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
		g_warning("gpgme_op_verify failed: %s\n", err_str);
		goto out_sigdata;
	}

	if (g_task_return_error_if_cancelled(task)) {
		debug_print("task was cancelled, aborting task:%p\n", task);
		cancelled = TRUE;
		goto out_sigdata;
	}

	gpgme_res = gpgme_op_verify_result(ctx);
	if (gpgme_res && gpgme_res->signatures == NULL) {
		err = GPG_ERR_SYSTEM_ERROR;
		g_warning("no signature found");
		g_snprintf(err_str, GPGERR_BUFSIZE, "No signature found");
		goto out_sigdata;
	}

	task_result = g_new0(SigCheckTaskResult, 1);
	task_result->sig_data = g_new0(SignatureData, 1);

	task_result->sig_data->status = sgpgme_sigstat_gpgme_to_privacy(ctx, gpgme_res);
	task_result->sig_data->info_short = sgpgme_sigstat_info_short(ctx, gpgme_res);
	task_result->sig_data->info_full = sgpgme_sigstat_info_full(ctx, gpgme_res);

	return_err = FALSE;

out_sigdata:
	gpgme_data_release(sigdata);
out_textdata:
	gpgme_data_release(textdata);
out_textstr:
	g_free(textstr);
out_ctx:
	gpgme_release(ctx);
out:
	if (cancelled)
		return;

	if (return_err)
		g_task_return_new_error(task, domain, err, "%s", err_str);
	else
		g_task_return_pointer(task, task_result, privacy_free_sig_check_task_result);
}

gint cm_check_detached_sig_async(MimeInfo *mimeinfo,
	GCancellable *cancellable,
	GAsyncReadyCallback callback,
	gpointer user_data,
	gpgme_protocol_t protocol,
	gchar *(*get_canonical_content)(FILE *, const gchar *))
{
	GTask *task;
	DetachedSigTaskData *task_data;
	MimeInfo *parent;
	MimeInfo *signature;
	gchar *boundary;

	parent = procmime_mimeinfo_parent(mimeinfo);

	boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
	if (boundary == NULL) {
		debug_print("failed to lookup boundary string\n");
		return -1;
	}

	signature = (MimeInfo *) mimeinfo->node->next->data;

	task_data = g_new0(DetachedSigTaskData, 1);

	task_data->protocol = protocol;
	task_data->boundary = g_strdup(boundary);
	task_data->text_filename = g_strdup(parent->data.filename);
	task_data->sig_filename = g_strdup(signature->data.filename);
	task_data->sig_offset = signature->offset;
	task_data->sig_length = signature->length;
	task_data->sig_encoding = signature->encoding_type;
	task_data->get_canonical_content = get_canonical_content;

	task = g_task_new(NULL, cancellable, callback, user_data);
	mimeinfo->last_sig_check_task = task;

	g_task_set_task_data(task, task_data, cm_free_detached_sig_task_data);
	debug_print("creating check sig async task:%p task_data:%p\n", task, task_data);
	g_task_set_return_on_cancel(task, TRUE);
	g_task_run_in_thread(task, cm_check_detached_sig);
	g_object_unref(task);

	return 0;
}

gpgme_verify_result_t sgpgme_verify_signature(gpgme_ctx_t ctx, gpgme_data_t sig, 
					gpgme_data_t plain, gpgme_data_t dummy)
{
	gpgme_verify_result_t status = NULL;
	gpgme_error_t err;

	if ((err = gpgme_op_verify(ctx, sig, plain, dummy)) != GPG_ERR_NO_ERROR) {
		debug_print("op_verify err %s\n", gpgme_strerror(err));
		privacy_set_error("%s", gpgme_strerror(err));
		return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
	}
	status = gpgme_op_verify_result(ctx);
	if (status && status->signatures == NULL) {
		debug_print("no signature found\n");
		privacy_set_error(_("No signature found"));
		return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
	}
	return status;
}

SignatureStatus sgpgme_sigstat_gpgme_to_privacy(gpgme_ctx_t ctx, gpgme_verify_result_t status)
{
	gpgme_signature_t sig = NULL;
	
	if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
		debug_print("system error\n");
		return SIGNATURE_CHECK_FAILED;
	}

	if (status == NULL) {
		debug_print("status == NULL\n");
		return SIGNATURE_UNCHECKED;
	}
	sig = status->signatures;

	if (sig == NULL) {
		debug_print("sig == NULL\n");
		return SIGNATURE_UNCHECKED;
	}

	debug_print("err code %d\n", gpg_err_code(sig->status));
	switch (gpg_err_code(sig->status)) {
	case GPG_ERR_NO_ERROR:
		switch (sig->validity) {
		case GPGME_VALIDITY_NEVER:
			return SIGNATURE_INVALID;
		case GPGME_VALIDITY_UNKNOWN:
		case GPGME_VALIDITY_UNDEFINED:
		case GPGME_VALIDITY_MARGINAL:
		case GPGME_VALIDITY_FULL:
		case GPGME_VALIDITY_ULTIMATE:
			return SIGNATURE_OK;
		default:
			return SIGNATURE_CHECK_FAILED;
		}
	case GPG_ERR_SIG_EXPIRED:
	case GPG_ERR_CERT_REVOKED:
		return SIGNATURE_WARN;
	case GPG_ERR_KEY_EXPIRED:
		return SIGNATURE_KEY_EXPIRED;
	case GPG_ERR_BAD_SIGNATURE:
		return SIGNATURE_INVALID;
	case GPG_ERR_NO_PUBKEY:
		return SIGNATURE_CHECK_FAILED;
	default:
		return SIGNATURE_CHECK_FAILED;
	}
	return SIGNATURE_CHECK_FAILED;
}

static const gchar *get_validity_str(unsigned long validity)
{
	switch (gpg_err_code(validity)) {
	case GPGME_VALIDITY_UNKNOWN:
		return _("Unknown");
	case GPGME_VALIDITY_UNDEFINED:
		return _("Undefined");
	case GPGME_VALIDITY_NEVER:
		return _("Never");
	case GPGME_VALIDITY_MARGINAL:
		return _("Marginal");
	case GPGME_VALIDITY_FULL:
		return _("Full");
	case GPGME_VALIDITY_ULTIMATE:
		return _("Ultimate");
	default:
		return _("Error");
	}
}

static const gchar *get_owner_trust_str(unsigned long owner_trust)
{
	switch (gpgme_err_code(owner_trust)) {
	case GPGME_VALIDITY_NEVER:
		return _("Untrusted");
	case GPGME_VALIDITY_MARGINAL:
		return _("Marginal");
	case GPGME_VALIDITY_FULL:
		return _("Full");
	case GPGME_VALIDITY_ULTIMATE:
		return _("Ultimate");
	default:
		return _("Unknown");
	}
}

gchar *get_gpg_executable_name()
{
	gpgme_engine_info_t e;

	if (!gpgme_get_engine_info(&e)) {
		while (e != NULL) {
			if (e->protocol == GPGME_PROTOCOL_OpenPGP
					&& e->file_name != NULL) {
				debug_print("Found gpg executable: '%s'\n", e->file_name);
				return e->file_name;
			}
		}
	}

	return NULL;
}

static gchar *get_gpg_version_string()
{
	gpgme_engine_info_t e;

	if (!gpgme_get_engine_info(&e)) {
		while (e != NULL) {
			if (e->protocol == GPGME_PROTOCOL_OpenPGP
					&& e->version != NULL) {
				debug_print("Got OpenPGP version: '%s'\n", e->version);
				return e->version;
			}
		}
	}

	return NULL;
}

static gchar *extract_name(const char *uid)
{
	if (uid == NULL)
		return NULL;
	if (!strncmp(uid, "CN=", 3)) {
		gchar *result = g_strdup(uid+3);
		if (strstr(result, ","))
			*(strstr(result, ",")) = '\0';
		return result;
	} else if (strstr(uid, ",CN=")) {
		gchar *result = g_strdup(strstr(uid, ",CN=")+4);
		if (strstr(result, ","))
			*(strstr(result, ",")) = '\0';
		return result;
	} else {
		return g_strdup(uid);
	}
}
gchar *sgpgme_sigstat_info_short(gpgme_ctx_t ctx, gpgme_verify_result_t status)
{
	gpgme_signature_t sig = NULL;
	gchar *uname = NULL;
	gpgme_key_t key;
	gchar *result = NULL;
	gpgme_error_t err = 0;
	static gboolean warned = FALSE;

	if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
		return g_strdup_printf(_("The signature can't be checked - %s"), privacy_get_error());
	}

	if (status == NULL) {
		return g_strdup(_("The signature has not been checked."));
	}
	sig = status->signatures;
	if (sig == NULL) {
		return g_strdup(_("The signature has not been checked."));
	}

	err = gpgme_get_key(ctx, sig->fpr, &key, 0);
	if (gpg_err_code(err) == GPG_ERR_NO_AGENT) {
		if (!warned)
			alertpanel_error(_("PGP Core: Can't get key - no gpg-agent running."));
		else
			g_warning("PGP Core: can't get key - no gpg-agent running");
		warned = TRUE;
	} else if (gpg_err_code(err) != GPG_ERR_NO_ERROR && gpg_err_code(err) != GPG_ERR_EOF) {
		return g_strdup_printf(_("The signature can't be checked - %s"), 
			gpgme_strerror(err));
  }

	if (key)
		uname = extract_name(key->uids->uid);
	else
		uname = g_strdup("<?>");

	switch (gpg_err_code(sig->status)) {
	case GPG_ERR_NO_ERROR:
               switch ((key && key->uids) ? key->uids->validity : GPGME_VALIDITY_UNKNOWN) {
		case GPGME_VALIDITY_ULTIMATE:
			result = g_strdup_printf(_("Good signature from \"%s\" [ultimate]"), uname);
			break;
		case GPGME_VALIDITY_FULL:
			result = g_strdup_printf(_("Good signature from \"%s\" [full]"), uname);
			break;
		case GPGME_VALIDITY_MARGINAL:
			result = g_strdup_printf(_("Good signature from \"%s\" [marginal]"), uname);
			break;
		case GPGME_VALIDITY_UNKNOWN:
		case GPGME_VALIDITY_UNDEFINED:
		case GPGME_VALIDITY_NEVER:
		default:
			if (key) {
				result = g_strdup_printf(_("Good signature from \"%s\""), uname);
			} else {
				result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
			}
			break;
               }
		break;
	case GPG_ERR_SIG_EXPIRED:
		result = g_strdup_printf(_("Expired signature from \"%s\""), uname);
		break;
	case GPG_ERR_KEY_EXPIRED:
		result = g_strdup_printf(_("Good signature from \"%s\", but the key has expired"), uname);
		break;
	case GPG_ERR_CERT_REVOKED:
		result = g_strdup_printf(_("Good signature from \"%s\", but the key has been revoked"), uname);
		break;
	case GPG_ERR_BAD_SIGNATURE:
		result = g_strdup_printf(_("Bad signature from \"%s\""), uname);
		break;
	case GPG_ERR_NO_PUBKEY: {
		result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
		break;
		}
	default:
		result = g_strdup(_("The signature has not been checked"));
		break;
	}
	if (result == NULL)
		result = g_strdup(_("Error"));
	g_free(uname);

	if (key)
		gpgme_key_unref(key);

	return result;
}

gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
{
	gint i = 0;
	gchar *ret;
	GString *siginfo;
	gpgme_signature_t sig = NULL;

	siginfo = g_string_sized_new(64);
	if (status == NULL) {
		g_string_append_printf(siginfo,
			_("Error checking signature: no status\n"));
		goto bail;
	 }

	sig = status->signatures;
	
	while (sig) {
		char buf[100];
		struct tm lt;
		gpgme_key_t key;
		gpgme_error_t err;
		gpgme_user_id_t tmp;
		const gchar *keytype, *keyid, *uid;
		
		err = gpgme_get_key(ctx, sig->fpr, &key, 0);

		if (err != GPG_ERR_NO_ERROR) {
			key = NULL;
			g_string_append_printf(siginfo, 
				_("Error checking signature: %s\n"),
				gpgme_strerror(err));
			goto bail;
		}
		if (key) {
			keytype = gpgme_pubkey_algo_name(
					key->subkeys->pubkey_algo);
			keyid = key->subkeys->keyid;
			uid = key->uids->uid;
		} else {
			keytype = "?";
			keyid = "?";
			uid = "?";
		}

		memset(buf, 0, sizeof(buf));
		fast_strftime(buf, sizeof(buf)-1, prefs_common_get_prefs()->date_format, localtime_r((time_t *)&sig->timestamp, &lt));
		g_string_append_printf(siginfo,
			_("Signature made on %s using %s key ID %s\n"),
			buf, keytype, keyid);
		
		switch (gpg_err_code(sig->status)) {
		case GPG_ERR_NO_ERROR:
			g_string_append_printf(siginfo,
				_("Good signature from uid \"%s\" (Validity: %s)\n"),
				uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
			break;
		case GPG_ERR_KEY_EXPIRED:
			g_string_append_printf(siginfo,
				_("Expired key uid \"%s\"\n"),
				uid);
			break;
		case GPG_ERR_SIG_EXPIRED:
			g_string_append_printf(siginfo,
				_("Expired signature from uid \"%s\" (Validity: %s)\n"),
				uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
			break;
		case GPG_ERR_CERT_REVOKED:
			g_string_append_printf(siginfo,
				_("Revoked key uid \"%s\"\n"),
				uid);
			break;
		case GPG_ERR_BAD_SIGNATURE:
			g_string_append_printf(siginfo,
				_("BAD signature from \"%s\"\n"),
				uid);
			break;
		default:
			break;
		}
		if (sig->status != GPG_ERR_BAD_SIGNATURE) {
			gint j = 1;
			if (key) {
				tmp = key->uids ? key->uids->next : NULL;
				while (tmp != NULL) {
					g_string_append_printf(siginfo,
						_("                    uid \"%s\" (Validity: %s)\n"),
						tmp->uid,
						tmp->revoked==TRUE?_("Revoked"):get_validity_str(tmp->validity));
					j++;
					tmp = tmp->next;
				}
			}
			g_string_append_printf(siginfo,_("Owner Trust: %s\n"),
					       key ? get_owner_trust_str(key->owner_trust) : _("No key!"));
			g_string_append(siginfo,
				_("Primary key fingerprint:"));
			const char* primary_fpr = NULL;
			if (key && key->subkeys && key->subkeys->fpr)
				primary_fpr = key->subkeys->fpr;
			else
				g_string_append(siginfo, " ?");
			int idx; /* now pretty-print the fingerprint */
			for (idx=0; primary_fpr && *primary_fpr!='\0'; idx++, primary_fpr++) {
				if (idx%4==0)
					g_string_append_c(siginfo, ' ');
				if (idx%20==0)
					g_string_append_c(siginfo, ' ');
				g_string_append_c(siginfo, (gchar)*primary_fpr);
			}
			g_string_append_c(siginfo, '\n');

			if (sig->pka_trust == 1 && sig->pka_address) {
				g_string_append_printf(siginfo,
					_("WARNING: Signer's address \"%s\" "
					"does not match DNS entry\n"),
					sig->pka_address);
			}
			else if (sig->pka_trust == 2 && sig->pka_address) {
				g_string_append_printf(siginfo,
					_("Verified signer's address is \"%s\"\n"),
						sig->pka_address);
						/* FIXME: Compare the address to the
						 * From: address.  */
			}
		}

		g_string_append(siginfo, "\n");
		i++;
		sig = sig->next;
		gpgme_key_unref(key);
	}
bail:
	ret = siginfo->str;
	g_string_free(siginfo, FALSE);
	return ret;
}

gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
{
	gpgme_data_t data = NULL;
	gpgme_error_t err;
	FILE *fp = claws_fopen(mimeinfo->data.filename, "rb");

	if (!fp) 
		return NULL;

	err = gpgme_data_new_from_filepart(&data, NULL, fp, mimeinfo->offset, mimeinfo->length);
	claws_fclose(fp);

	debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
	if (err) {
		debug_print ("gpgme_data_new_from_file failed: %s\n",
			     gpgme_strerror (err));
		privacy_set_error(_("Couldn't get data from message, %s"), gpgme_strerror(err));
		return NULL;
	}
	return data;
}

gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
{
	struct passphrase_cb_info_s info;
	gpgme_data_t plain;
	gpgme_error_t err;

	memset (&info, 0, sizeof info);
	
	if ((err = gpgme_data_new(&plain)) != GPG_ERR_NO_ERROR) {
		gpgme_release(ctx);
		privacy_set_error(_("Couldn't initialize data, %s"), gpgme_strerror(err));
		return NULL;
	}
	
	if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
		prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
		if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
        		info.c = ctx;
        		gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
    		}
	} else {
		prefs_gpg_enable_agent(TRUE);
        	info.c = ctx;
        	gpgme_set_passphrase_cb (ctx, NULL, &info);
	}
	
	
	if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
		err = gpgme_op_decrypt_verify(ctx, cipher, plain);
		if (err != GPG_ERR_NO_ERROR) {
			debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
			privacy_set_error("%s", gpgme_strerror(err));
			gpgmegtk_free_passphrase();
			gpgme_data_release(plain);
			return NULL;
		}

		err = cm_gpgme_data_rewind(plain);
		if (err) {
			debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
		}

		debug_print("decrypted.\n");
		*status = gpgme_op_verify_result (ctx);
	} else {
		err = gpgme_op_decrypt(ctx, cipher, plain);
		if (err != GPG_ERR_NO_ERROR) {
			debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
			privacy_set_error("%s", gpgme_strerror(err));
			gpgmegtk_free_passphrase();
			gpgme_data_release(plain);
			return NULL;
		}

		err = cm_gpgme_data_rewind(plain);
		if (err) {
			debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
		}

		debug_print("decrypted.\n");
		*status = gpgme_op_verify_result (ctx);
	}
	return plain;
}

gchar *sgpgme_get_encrypt_data(GSList *recp_names, gpgme_protocol_t proto)
{
	SelectionResult result = KEY_SELECTION_CANCEL;
	gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result,
				proto);
	gchar *ret = NULL;
	int i = 0;

	if (!keys) {
		if (result == KEY_SELECTION_DONT)
			return g_strdup("_DONT_ENCRYPT_");
		else
			return NULL;
	}
	while (keys[i]) {
		gpgme_subkey_t skey = keys[i]->subkeys;
		gchar *fpr = skey->fpr;
		gchar *tmp = NULL;
		debug_print("adding %s\n", fpr);
		tmp = g_strconcat(ret ? ret : "", fpr, " ", NULL);
		if (ret)
			g_free(ret);
		ret = tmp;
		i++;
	}
	g_free(keys);
	return ret;
}

gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account,
			      const gchar *from_addr)
{
	GPGAccountConfig *config;
	const gchar *signer_addr = account->address;
	SignKeyType sk;
	gchar *skid;
	gboolean smime = FALSE;

	gpgme_signers_clear(ctx);

	if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_CMS)
		smime = TRUE;

	if (from_addr)
		signer_addr = from_addr;
	config = prefs_gpg_account_get_config(account);

	if(smime) {
		debug_print("sgpgme_setup_signers: S/MIME protocol\n");
		sk = config->smime_sign_key;
		skid = config->smime_sign_key_id;
	} else {
		debug_print("sgpgme_setup_signers: OpenPGP protocol\n");
		sk = config->sign_key;
		skid = config->sign_key_id;
	}

	switch(sk) {
	case SIGN_KEY_DEFAULT:
		debug_print("using default gnupg key\n");
		break;
	case SIGN_KEY_BY_FROM:
		debug_print("using key for %s\n", signer_addr);
		break;
	case SIGN_KEY_CUSTOM:
		debug_print("using key for %s\n", skid);
		break;
	}

	if (sk != SIGN_KEY_DEFAULT) {
		const gchar *keyid;
		gpgme_key_t key, found_key;
		gpgme_error_t err;

		if (sk == SIGN_KEY_BY_FROM)
			keyid = signer_addr;
		else if (sk == SIGN_KEY_CUSTOM)
			keyid = skid;
		else
			goto bail;

                found_key = NULL;
		/* Look for any key, not just private ones, or GPGMe doesn't
		 * correctly set the revoked flag. */
		err = gpgme_op_keylist_start(ctx, keyid, 0);
		while (err == 0) {
			if ((err = gpgme_op_keylist_next(ctx, &key)) != 0)
				break;

			if (key == NULL)
				continue;

			if (!key->can_sign) {
				debug_print("skipping a key, can not be used for signing\n");
				gpgme_key_unref(key);
				continue;
			}

			if (key->protocol != gpgme_get_protocol(ctx)) {
				debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
				gpgme_key_unref(key);
				continue;
			}

			if (key->expired) {
				debug_print("skipping a key, expired\n");
				gpgme_key_unref(key);
				continue;
			}
			if (key->revoked) {
				debug_print("skipping a key, revoked\n");
				gpgme_key_unref(key);
				continue;
			}
			if (key->disabled) {
				debug_print("skipping a key, disabled\n");
				gpgme_key_unref(key);
				continue;
			}

			if (found_key != NULL) {
				gpgme_key_unref(key);
				gpgme_op_keylist_end(ctx);
				g_warning("ambiguous specification of secret key '%s'", keyid);
				privacy_set_error(_("Secret key specification is ambiguous"));
				goto bail;
			}

			found_key = key;
		}
		gpgme_op_keylist_end(ctx);

		if (found_key == NULL) {
			g_warning("setup_signers start: %s", gpgme_strerror(err));
			privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
			goto bail;
                }

		err = gpgme_signers_add(ctx, found_key);
		debug_print("got key (proto %d (pgp %d, smime %d).\n",
			    found_key->protocol, GPGME_PROTOCOL_OpenPGP,
			    GPGME_PROTOCOL_CMS);
		gpgme_key_unref(found_key);

		if (err) {
			g_warning("error adding secret key: %s",
				  gpgme_strerror(err));
			privacy_set_error(_("Error setting secret key: %s"),
					  gpgme_strerror(err));
			goto bail;
		}
        }

	prefs_gpg_account_free_config(config);

	return TRUE;
bail:
	prefs_gpg_account_free_config(config);
	return FALSE;
}

void sgpgme_init()
{
	gchar *ctype_locale = NULL, *messages_locale = NULL;
	gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
	gpgme_error_t err = 0;

	gpgme_engine_info_t engineInfo;

	if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
	    && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
		err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
		if (err != GPG_ERR_NO_ERROR)
			g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
	}

	if (gpgme_check_version("1.0.0")) {
#ifdef LC_CTYPE
		debug_print("setting gpgme CTYPE locale\n");
#ifdef G_OS_WIN32
		ctype_locale = g_win32_getlocale();
#else
		ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
#endif
		if (ctype_locale) {
			debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
			if (strchr(ctype_locale, '.'))
				*(strchr(ctype_locale, '.')) = '\0';
			else if (strchr(ctype_locale, '@'))
				*(strchr(ctype_locale, '@')) = '\0';
			ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);

			debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
			gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);

			debug_print("done\n");
			g_free(ctype_utf8_locale);
			g_free(ctype_locale);
		} else {
			debug_print("couldn't set gpgme CTYPE locale\n");
		}
#endif
#ifdef LC_MESSAGES
		debug_print("setting gpgme MESSAGES locale\n");
#ifdef G_OS_WIN32
		messages_locale = g_win32_getlocale();
#else
		messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
#endif
		if (messages_locale) {
			debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
			if (strchr(messages_locale, '.'))
				*(strchr(messages_locale, '.')) = '\0';
			else if (strchr(messages_locale, '@'))
				*(strchr(messages_locale, '@')) = '\0';
			messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
			debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");

			gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);

			debug_print("done\n");
			g_free(messages_utf8_locale);
			g_free(messages_locale);
		} else {
			debug_print("couldn't set gpgme MESSAGES locale\n");
		}
#endif
		if (!gpgme_get_engine_info(&engineInfo)) {
			while (engineInfo) {
				debug_print("GpgME Protocol: %s\n"
					    "Version: %s (req %s)\n"
					    "Executable: %s\n",
					gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
					engineInfo->version ? engineInfo->version:"???",
					engineInfo->req_version ? engineInfo->req_version:"???",
					engineInfo->file_name ? engineInfo->file_name:"???");
				if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
				&&  gpgme_engine_check_version(engineInfo->protocol) != 
					GPG_ERR_NO_ERROR) {
					if (engineInfo->file_name && !engineInfo->version) {
						alertpanel_error(_("Gpgme protocol '%s' is unusable: "
								   "Engine '%s' isn't installed properly."),
								   gpgme_get_protocol_name(engineInfo->protocol),
								   engineInfo->file_name);
					} else if (engineInfo->file_name && engineInfo->version
					  && engineInfo->req_version) {
						alertpanel_error(_("Gpgme protocol '%s' is unusable: "
								   "Engine '%s' version %s is installed, "
								   "but version %s is required.\n"),
								   gpgme_get_protocol_name(engineInfo->protocol),
								   engineInfo->file_name,
								   engineInfo->version,
								   engineInfo->req_version);
					} else {
						alertpanel_error(_("Gpgme protocol '%s' is unusable "
								   "(unknown problem)"),
								   gpgme_get_protocol_name(engineInfo->protocol));
					}
				}
				engineInfo = engineInfo->next;
			}
		}
	} else {
		sgpgme_disable_all();

		if (prefs_gpg_get_config()->gpg_warning) {
			AlertValue val;

			val = alertpanel_full
				(_("Warning"),
				 _("GnuPG is not installed properly, or needs "
				 "to be upgraded.\n"
				 "OpenPGP support disabled."),
				 "window-close", _("_Close"), NULL, NULL, NULL, NULL,
				 ALERTFOCUS_FIRST, TRUE, NULL, ALERT_WARNING);
			if (val & G_ALERTDISABLE)
				prefs_gpg_get_config()->gpg_warning = FALSE;
		}
	}
}

void sgpgme_done()
{
        gpgmegtk_free_passphrase();
}

#ifdef G_OS_WIN32
struct _ExportCtx {
	gboolean done;
	gchar *cmd;
	DWORD exitcode;
};

static void *_export_threaded(void *arg)
{
	struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
	gboolean result;

	PROCESS_INFORMATION pi = {0};
	STARTUPINFO si = {0};

	result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
			NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
			NULL, NULL, &si, &pi);

	if (!result) {
		debug_print("Couldn't execute '%s'\n", ctx->cmd);
	} else {
		WaitForSingleObject(pi.hProcess, 10000);
		result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
		if (ctx->exitcode == STILL_ACTIVE) {
			debug_print("Process still running, terminating it.\n");
			TerminateProcess(pi.hProcess, 255);
		}

		CloseHandle(pi.hProcess);
		CloseHandle(pi.hThread);

		if (!result) {
			debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
		}
	}

	ctx->done = TRUE;
	return NULL;
}
#endif

void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
{
	AlertValue val = G_ALERTDEFAULT;
	gchar *key_parms = NULL;
	gchar *name = NULL;
	gchar *email = NULL;
	gchar *passphrase = NULL, *passphrase_second = NULL;
	gint prev_bad = 0;
	gchar *tmp = NULL, *gpgver;
	gpgme_error_t err = 0;
	gpgme_ctx_t ctx;
	GtkWidget *window = NULL;
	gpgme_genkey_result_t key;
	gboolean exported = FALSE;

	if (account == NULL)
		account = account_get_default();

	if (account->address == NULL) {
		alertpanel_error(_("You have to save the account's information with \"OK\" "
				   "before being able to generate a key pair.\n"));
		return;
	}
	if (ask_create) {
		val = alertpanel(_("No PGP key found"),
				_("Claws Mail did not find a secret PGP key, "
				  "which means that you won't be able to sign "
				  "emails or receive encrypted emails.\n"
				  "Do you want to create a new key pair now?"),
				  NULL, _("_No"), NULL, _("_Yes"), NULL, NULL,
				 ALERTFOCUS_SECOND);
		if (val == G_ALERTDEFAULT) {
			return;
		}
	}

	if (account->name) {
		name = g_strdup(account->name);
	} else {
		name = g_strdup(account->address);
	}
	email = g_strdup(account->address);
	tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
	gpgver = get_gpg_version_string();
	if (gpgver == NULL || !strncmp(gpgver, "1.", 2)) {
		debug_print("Using gpg 1.x, using builtin passphrase dialog.\n");
again:
		passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
		if (passphrase == NULL) {
			g_free(tmp);
			g_free(email);
			g_free(name);
			return;
		}
		passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
		if (passphrase_second == NULL) {
			g_free(tmp);
			g_free(email);
			if (passphrase != NULL) {
				memset(passphrase, 0, strlen(passphrase));
				g_free(passphrase);
			}
			g_free(name);
			return;
		}
		if (strcmp(passphrase, passphrase_second)) {
			if (passphrase != NULL) {
				memset(passphrase, 0, strlen(passphrase));
				g_free(passphrase);
			}
			if (passphrase_second != NULL) {
				memset(passphrase_second, 0, strlen(passphrase_second));
				g_free(passphrase_second);
			}
			prev_bad = 1;
			goto again;
		}
	}
	
	key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
					"Key-Type: RSA\n"
					"Key-Length: 2048\n"
					"Subkey-Type: RSA\n"
					"Subkey-Length: 2048\n"
					"Name-Real: %s\n"
					"Name-Email: %s\n"
					"Expire-Date: 0\n"
					"%s%s%s"
					"</GnupgKeyParms>\n",
					name, email, 
					passphrase?"Passphrase: ":"",
					passphrase?passphrase:"",
					passphrase?"\n":"");
#ifndef G_PLATFORM_WIN32
	if (passphrase &&
			mlock(passphrase, strlen(passphrase)) == -1)
		debug_print("couldn't lock passphrase\n");
	if (passphrase_second &&
			mlock(passphrase_second, strlen(passphrase_second)) == -1)
		debug_print("couldn't lock passphrase2\n");
#endif
	g_free(tmp);
	g_free(email);
	g_free(name);
	if (passphrase_second != NULL) {
		memset(passphrase_second, 0, strlen(passphrase_second));
		g_free(passphrase_second);
	}
	if (passphrase != NULL) {
		memset(passphrase, 0, strlen(passphrase));
		g_free(passphrase);
	}
	
	err = gpgme_new (&ctx);
	if (err) {
		alertpanel_error(_("Couldn't generate a new key pair: %s"),
				 gpgme_strerror(err));
		if (key_parms != NULL) {
			memset(key_parms, 0, strlen(key_parms));
			g_free(key_parms);
		}
		return;
	}
	

	window = label_window_create(_("Generating your new key pair... Please move the mouse "
			      "around to help generate entropy..."));

	err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
	if (key_parms != NULL) {
		memset(key_parms, 0, strlen(key_parms));
		g_free(key_parms);
	}

	label_window_destroy(window);

	if (err) {
		alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
		gpgme_release(ctx);
		return;
	}
	key = gpgme_op_genkey_result(ctx);
	if (key == NULL) {
		alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
		gpgme_release(ctx);
		return;
	} else {
		gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
				    "Its fingerprint is:\n%s\n\nDo you want to export it "
				    "to a keyserver?"),
				    key->fpr ? key->fpr:"null");
		AlertValue val = alertpanel(_("Key generated"), buf,
				  NULL, _("_No"), NULL, _("_Yes"), NULL, NULL, ALERTFOCUS_SECOND);
		g_free(buf);
		if (val == G_ALERTALTERNATE) {
			gchar *gpgbin = get_gpg_executable_name();
			gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
				(gpgbin ? gpgbin : "gpg"), key->fpr);
			debug_print("Executing command: %s\n", cmd);

#ifndef G_OS_WIN32
			int res = 0;
			pid_t pid = 0;
			pid = fork();
			if (pid == -1) {
				res = -1;
			} else if (pid == 0) {
				/* son */
				res = system(cmd);
				res = WEXITSTATUS(res);
				_exit(res);
			} else {
				int status = 0;
				time_t start_wait = time(NULL);
				res = -1;
				do {
					if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
						usleep(200000);
					} else {
						res = WEXITSTATUS(status);
						break;
					}
					if (time(NULL) - start_wait > 5) {
						debug_print("SIGTERM'ing gpg\n");
						kill(pid, SIGTERM);
					}
					if (time(NULL) - start_wait > 6) {
						debug_print("SIGKILL'ing gpg\n");
						kill(pid, SIGKILL);
						break;
					}
				} while(1);
			}

			if (res == 0)
				exported = TRUE;
#else
			/* We need to call gpg in a separate thread, so that waiting for
			 * it to finish does not block the UI. */
			pthread_t pt;
			struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));

			ectx->done = FALSE;
			ectx->exitcode = STILL_ACTIVE;
			ectx->cmd = cmd;

			if (pthread_create(&pt, NULL,
						_export_threaded, (void *)ectx) != 0) {
				debug_print("Couldn't create thread, continuing unthreaded.\n");
				_export_threaded(ctx);
			} else {
				debug_print("Thread created, waiting for it to finish...\n");
				while (!ectx->done)
					claws_do_idle();
			}

			debug_print("Thread finished.\n");
			pthread_join(pt, NULL);

			if (ectx->exitcode == 0)
				exported = TRUE;

			g_free(ectx);
#endif
			g_free(cmd);

			if (exported) {
				alertpanel_notice(_("Key exported."));
			} else {
				alertpanel_error(_("Couldn't export key."));
			}
		}
	}
	gpgme_release(ctx);
}

gboolean sgpgme_has_secret_key(void)
{
	gpgme_error_t err = 0;
	gpgme_ctx_t ctx;
	gpgme_key_t key;

	err = gpgme_new (&ctx);
	if (err) {
		debug_print("err : %s\n", gpgme_strerror(err));
		return TRUE;
	}
check_again:
	err = gpgme_op_keylist_start(ctx, NULL, TRUE);
	if (!err) {
		err = gpgme_op_keylist_next(ctx, &key);
		gpgme_key_unref(key); /* We're not interested in the key itself. */
	}
	gpgme_op_keylist_end(ctx);
	if (gpg_err_code(err) == GPG_ERR_EOF) {
		if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
			gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
			goto check_again;
		}
		gpgme_release(ctx);
		return FALSE;
	} else {
		gpgme_release(ctx);
		return TRUE;
	}
}

void sgpgme_check_create_key(void)
{
	if (prefs_gpg_get_config()->gpg_ask_create_key &&
	    !sgpgme_has_secret_key()) {
		sgpgme_create_secret_key(NULL, TRUE);
	}

	prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
	prefs_gpg_save_config();
}

void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
{
	char buf[BUFSIZ];
	void *result = NULL;
	ssize_t r = 0;
	size_t w = 0;
	
	cm_return_val_if_fail(data != NULL, NULL);
	cm_return_val_if_fail(len != NULL, NULL);

	/* I know it's deprecated, but we don't compile with _LARGEFILE */
	cm_gpgme_data_rewind(data);
	while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
		void *rresult = realloc(result, r + w);
		if (rresult == NULL) {
			g_warning("can't allocate memory");
			if (result != NULL)
				free(result);
			return NULL;
		}
		result = rresult;
		memcpy(result+w, buf, r);
		w += r;
	}
	
	*len = w;

	gpgme_data_release(data);
	if (r < 0) {
		g_warning("gpgme_data_read() returned an error: %d", (int)r);
		free(result);
		*len = 0;
		return NULL;
	}
	return result;
}

gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
{
#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
	if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
		return gpg_error_from_errno(errno);
	else
		return 0;
#else
	return gpgme_data_rewind(dh);
#endif
}

#endif /* USE_GPGME */