1 files changed, 402 insertions, 0 deletions
diff --git a/src/otr/key.c b/src/otr/key.c
new file mode 100644
index 00000000..4032b0b2
--- /dev/null
+++ b/src/otr/key.c
@@ -0,0 +1,402 @@
+/*
+ * Off-the-Record Messaging (OTR) modules for IRC
+ *
+ * Copyright (C) 2008 - Uli Meis <a.sporto+bee@gmail.com>
+ *               2012 - David Goulet <dgoulet@ev0ke.net>
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA
+ */
+
+#define _GNU_SOURCE
+#include <glib.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/poll.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "key.h"
+
+#include "levels.h"
+#include "network.h"
+#include "pidwait.h"
+#include "printtext.h"
+
+#include "irssi-otr.h"
+#include "otr-formats.h"
+
+/*
+ * Status of key generation.
+ */
+enum key_gen_status {
+	KEY_GEN_IDLE		= 0,
+	KEY_GEN_RUNNING		= 1,
+	KEY_GEN_FINISHED	= 2,
+	KEY_GEN_ERROR		= 3,
+};
+
+/*
+ * Data of the state of key generation.
+ */
+struct key_gen_data {
+	struct otr_user_state *ustate;
+	char *account_name;
+	char *key_file_path;
+	enum key_gen_status status;
+	gcry_error_t gcry_error;
+};
+
+/*
+ * Event from the key generation process.
+ */
+struct key_gen_event {
+	enum key_gen_status status;
+	gcry_error_t error;
+};
+
+/*
+ * Key generation process.
+ */
+struct key_gen_worker {
+	int tag;
+	GIOChannel *pipes[2];
+};
+
+/*
+ * Key generation data for the thread in charge of creating the key.
+ */
+static struct key_gen_data key_gen_state = {
+	.status = KEY_GEN_IDLE,
+	.gcry_error = GPG_ERR_NO_ERROR,
+};
+
+/*
+ * Build file path concatenate to the irssi config dir.
+ */
+static char *file_path_build(const char *path)
+{
+	g_return_val_if_fail(path != NULL, NULL);
+
+	/* Either NULL or the filename is returned here which is valid. */
+	return g_strdup_printf("%s/%s", get_irssi_dir(), path);
+}
+
+/*
+ * Emit a key generation status event.
+ */
+static void emit_event(GIOChannel *pipe, enum key_gen_status status, gcry_error_t error)
+{
+	struct key_gen_event event;
+
+	g_return_if_fail(pipe != NULL);
+
+	event.status = status;
+	event.error = error;
+
+	g_io_channel_write_block(pipe, &event, sizeof(event));
+}
+
+/*
+ * Reset key generation state and status is IDLE.
+ */
+static void reset_key_gen_state(void)
+{
+	/* Safety. */
+	g_free(key_gen_state.key_file_path);
+	g_free(key_gen_state.account_name);
+
+	/* Nullify everything. */
+	memset(&key_gen_state, 0, sizeof(key_gen_state));
+	key_gen_state.status = KEY_GEN_IDLE;
+	key_gen_state.gcry_error = GPG_ERR_NO_ERROR;
+}
+
+/*
+ * Read status event from key generation worker.
+ */
+static void read_key_gen_status(struct key_gen_worker *worker, GIOChannel *pipe)
+{
+	struct key_gen_event event;
+	gcry_error_t err;
+
+	g_return_if_fail(worker != NULL);
+
+	fcntl(g_io_channel_unix_get_fd(pipe), F_SETFL, O_NONBLOCK);
+
+	if (g_io_channel_read_block(pipe, &event, sizeof(event)) == -1) {
+		printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+				TXT_OTR_KEYGEN_FAILED,
+				key_gen_state.account_name,
+				g_strerror(errno));
+		return;
+	}
+
+	key_gen_state.status = event.status;
+	key_gen_state.gcry_error = event.error;
+
+	if (event.status == KEY_GEN_FINISHED || event.status == KEY_GEN_ERROR) {
+		/* Worker is done. */
+		g_source_remove(worker->tag);
+
+		g_io_channel_shutdown(worker->pipes[0], TRUE, NULL);
+		g_io_channel_unref(worker->pipes[0]);
+
+		g_io_channel_shutdown(worker->pipes[1], TRUE, NULL);
+		g_io_channel_unref(worker->pipes[1]);
+
+		g_free(worker);
+
+		if (event.status == KEY_GEN_ERROR) {
+			printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+					TXT_OTR_KEYGEN_FAILED,
+					key_gen_state.account_name,
+					gcry_strerror(key_gen_state.gcry_error));
+			reset_key_gen_state();
+			return;
+		}
+
+		err = otrl_privkey_read(key_gen_state.ustate->otr_state, key_gen_state.key_file_path);
+
+		if (err != GPG_ERR_NO_ERROR) {
+			printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+					TXT_OTR_KEYGEN_FAILED,
+					key_gen_state.account_name,
+					gcry_strerror(key_gen_state.gcry_error));
+		} else {
+			printformat(NULL, NULL, MSGLEVEL_CLIENTNOTICE,
+					TXT_OTR_KEYGEN_COMPLETED,
+					key_gen_state.account_name);
+		}
+
+		reset_key_gen_state();
+	}
+}
+
+/*
+ * Run key generation in a seperate process (takes ages). The other process
+ * will rewrite the key file, we shouldn't change anything till it's done and
+ * we've reloaded the keys.
+ */
+void key_gen_run(struct otr_user_state *ustate, const char *account_name)
+{
+	struct key_gen_worker *worker;
+	int fd[2];
+	gcry_error_t err;
+	pid_t pid;
+
+	g_return_if_fail(ustate != NULL);
+	g_return_if_fail(account_name != NULL);
+
+	if (key_gen_state.status != KEY_GEN_IDLE) {
+		printformat(NULL, NULL, MSGLEVEL_CLIENTNOTICE, TXT_OTR_KEYGEN_RUNNING, key_gen_state.account_name);
+		return;
+	}
+
+	/* Make sure the pointer does not go away during the proess. */
+	key_gen_state.account_name = strdup(account_name);
+	key_gen_state.ustate = ustate;
+
+	/* Creating key file path. */
+	key_gen_state.key_file_path = file_path_build(OTR_KEYFILE);
+	if (key_gen_state.key_file_path == NULL) {
+		printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+				TXT_OTR_KEYGEN_FAILED,
+				key_gen_state.account_name,
+				g_strerror(errno));
+		reset_key_gen_state();
+		return;
+	}
+
+	printformat(NULL, NULL, MSGLEVEL_CLIENTNOTICE, TXT_OTR_KEYGEN_STARTED, key_gen_state.account_name);
+
+	if (pipe(fd) != 0) {
+		printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+				TXT_OTR_KEYGEN_FAILED,
+				key_gen_state.account_name,
+				g_strerror(errno));
+		reset_key_gen_state();
+		return;
+	}
+
+	worker = g_new0(struct key_gen_worker, 1);
+
+	if (worker == NULL) {
+		printformat(NULL, NULL, MSGLEVEL_CLIENTERROR,
+				TXT_OTR_KEYGEN_FAILED,
+				key_gen_state.account_name,
+				g_strerror(errno));
+		reset_key_gen_state();
+		return;
+	}
+
+	worker->pipes[0] = g_io_channel_new(fd[0]);
+	worker->pipes[1] = g_io_channel_new(fd[1]);
+
+	pid = fork();
+
+	if (pid > 0) {
+		/* Parent process */
+		pidwait_add(pid);
+		worker->tag = g_input_add(worker->pipes[0], G_INPUT_READ, (GInputFunction)read_key_gen_status, worker);
+		return;
+	}
+
+	if (pid != 0) {
+		/* error */
+		g_warning("Key generation failed: %s", g_strerror(errno));
+
+		g_source_remove(worker->tag);
+
+		g_io_channel_shutdown(worker->pipes[0], TRUE, NULL);
+		g_io_channel_unref(worker->pipes[0]);
+
+		g_io_channel_shutdown(worker->pipes[1], TRUE, NULL);
+		g_io_channel_unref(worker->pipes[1]);
+
+		g_free(worker);
+
+		return;
+	}
+
+	/* Child process */
+	key_gen_state.status = KEY_GEN_RUNNING;
+	emit_event(worker->pipes[1], KEY_GEN_RUNNING, GPG_ERR_NO_ERROR);
+
+	err = otrl_privkey_generate(key_gen_state.ustate->otr_state, key_gen_state.key_file_path, key_gen_state.account_name, OTR_PROTOCOL_ID);
+
+	if (err != GPG_ERR_NO_ERROR) {
+		emit_event(worker->pipes[1], KEY_GEN_ERROR, err);
+		_exit(99);
+		return;
+	}
+
+	emit_event(worker->pipes[1], KEY_GEN_FINISHED, GPG_ERR_NO_ERROR);
+
+	_exit(99);
+}
+
+/*
+ * Write fingerprints to file.
+ */
+void key_write_fingerprints(struct otr_user_state *ustate)
+{
+	gcry_error_t err;
+	char *filename;
+
+	g_return_if_fail(ustate != NULL);
+
+	filename = file_path_build(OTR_FINGERPRINTS_FILE);
+	g_return_if_fail(filename != NULL);
+
+	err = otrl_privkey_write_fingerprints(ustate->otr_state, filename);
+	if (err == GPG_ERR_NO_ERROR) {
+		IRSSI_OTR_DEBUG("Fingerprints saved to %9%s%9", filename);
+	} else {
+		IRSSI_OTR_DEBUG("Error writing fingerprints: %d (%d)",
+				gcry_strerror(err), gcry_strsource(err));
+	}
+
+	g_free(filename);
+}
+
+/*
+ * Write instance tags to file.
+ */
+void key_write_instags(struct otr_user_state *ustate)
+{
+	gcry_error_t err;
+	char *filename;
+
+	g_return_if_fail(ustate != NULL);
+
+	filename = file_path_build(OTR_INSTAG_FILE);
+	g_return_if_fail(filename != NULL);
+
+	err = otrl_instag_write(ustate->otr_state, filename);
+	if (err == GPG_ERR_NO_ERROR) {
+		IRSSI_OTR_DEBUG("Instance tags saved in %9%s%9", filename);
+	} else {
+		IRSSI_OTR_DEBUG("Error saving instance tags: %d (%d)",
+				gcry_strerror(err), gcry_strsource(err));
+	}
+
+	g_free(filename);
+}
+
+/*
+ * Load private keys.
+ */
+void key_load(struct otr_user_state *ustate)
+{
+	int ret;
+	gcry_error_t err;
+	char *filename;
+
+	g_return_if_fail(ustate != NULL);
+
+	filename = file_path_build(OTR_KEYFILE);
+	g_return_if_fail(filename != NULL);
+
+	ret = access(filename, F_OK);
+	if (ret < 0) {
+		IRSSI_OTR_DEBUG("No private keys found in %9%s%9", filename);
+		g_free(filename);
+		return;
+	}
+
+	err = otrl_privkey_read(ustate->otr_state, filename);
+	if (err == GPG_ERR_NO_ERROR) {
+		IRSSI_OTR_DEBUG("Private keys loaded from %9%s%9", filename);
+	} else {
+		IRSSI_OTR_DEBUG("Error loading private keys: %d (%d)",
+				gcry_strerror(err), gcry_strsource(err));
+	}
+
+	g_free(filename);
+}
+
+/*
+ * Load fingerprints.
+ */
+void key_load_fingerprints(struct otr_user_state *ustate)
+{
+	int ret;
+	gcry_error_t err;
+	char *filename;
+
+	g_return_if_fail(ustate != NULL);
+
+	filename = file_path_build(OTR_FINGERPRINTS_FILE);
+	g_return_if_fail(filename != NULL);
+
+	ret = access(filename, F_OK);
+	if (ret < 0) {
+		IRSSI_OTR_DEBUG("No fingerprints found in %9%s%9", filename);
+		g_free(filename);
+		return;
+	}
+
+	err = otrl_privkey_read_fingerprints(ustate->otr_state, filename, NULL,
+			NULL);
+	if (err == GPG_ERR_NO_ERROR) {
+		IRSSI_OTR_DEBUG("Fingerprints loaded from %9%s%9", filename);
+	} else {
+		IRSSI_OTR_DEBUG("Error loading fingerprints: %d (%d)",
+				gcry_strerror(err), gcry_strsource(err));
+	}
+
+	g_free(filename);
+}