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/* $Id: smscrypt.c,v 1.11 2010/08/08 11:30:43 khorben Exp $ */

/* This file is part of DeforaOS Desktop Phone */

/* 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, version 3 of the License.

* 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/>. */

#include <stdarg.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <openssl/sha.h>

#include <gtk/gtk.h>

#include <System.h>

#include "Phone.h"

/* SMSCrypt */

/* private */

/* types */

typedef struct _SMSCrypt

{

/* internal */

unsigned char buf[20];

size_t len;

/* widgets */

GtkWidget * window;

GtkListStore * store;

GtkWidget * view;

} SMSCrypt;

/* prototypes */

static void _smscrypt_clear(PhonePlugin * plugin);

static int _smscrypt_init(PhonePlugin * plugin);

static int _smscrypt_destroy(PhonePlugin * plugin);

static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...);

static int _smscrypt_secret(PhonePlugin * plugin, char const * number);

static void _smscrypt_settings(PhonePlugin * plugin);

/* public */

/* variables */

PhonePlugin plugin =

{

NULL,

"SMS encryption",

NULL,

_smscrypt_init,

_smscrypt_destroy,

_smscrypt_event,

_smscrypt_settings,

NULL

};

/* private */

/* functions */

/* smscrypt_clear */

static void _smscrypt_clear(PhonePlugin * plugin)

{

SMSCrypt * smscrypt = plugin->priv;

memset(smscrypt->buf, 0, smscrypt->len);

}

/* smscrypt_init */

static void _init_foreach(char const * variable, char const * value,

void * priv);

static int _smscrypt_init(PhonePlugin * plugin)

{

SMSCrypt * smscrypt;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

if((smscrypt = malloc(sizeof(*smscrypt))) == NULL)

return error_set_code(1, "%s", strerror(errno));

plugin->priv = smscrypt;

smscrypt->len = sizeof(smscrypt->buf);

smscrypt->window = NULL;

smscrypt->store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_STRING);

plugin->helper->config_foreach(plugin->helper->phone, "smscrypt",

_init_foreach, smscrypt);

return 0;

}

static void _init_foreach(char const * variable, char const * value,

void * priv)

{

SMSCrypt * smscrypt = priv;

GtkTreeIter iter;

gtk_list_store_append(smscrypt->store, &iter);

gtk_list_store_set(smscrypt->store, &iter, 0, variable, 1, value, -1);

}

/* smscrypt_destroy */

static int _smscrypt_destroy(PhonePlugin * plugin)

{

SMSCrypt * smscrypt = plugin->priv;

free(smscrypt);

return 0;

}

/* smscrypt_event */

static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,

char const * number, PhoneEncoding * encoding, char ** buf,

size_t * len);

static int _smscrypt_event_sms_sending(PhonePlugin * plugin,

char const * number, PhoneEncoding * encoding, char ** buf,

size_t * len);

static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...)

{

int ret = 0;

va_list ap;

char const * number;

PhoneEncoding * encoding;

char ** buf;

size_t * len;

va_start(ap, event);

switch(event)

{

/* our deal */

case PHONE_EVENT_SMS_RECEIVING:

number = va_arg(ap, char const *);

encoding = va_arg(ap, PhoneEncoding *);

buf = va_arg(ap, char **);

len = va_arg(ap, size_t *);

ret = _smscrypt_event_sms_receiving(plugin, number,

encoding, buf, len);

break;

case PHONE_EVENT_SMS_SENDING:

number = va_arg(ap, char const *);

encoding = va_arg(ap, PhoneEncoding *);

buf = va_arg(ap, char **);

len = va_arg(ap, size_t *);

ret = _smscrypt_event_sms_sending(plugin, number,

encoding, buf, len);

break;

/* ignore the rest */

default:

break;

}

va_end(ap);

return ret;

}

static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,

char const * number, PhoneEncoding * encoding, char ** buf,

size_t * len)

{

SMSCrypt * smscrypt = plugin->priv;

size_t i;

size_t j = 0;

SHA_CTX sha1;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s(%u, buf, %lu)\n", __func__, *encoding,

*len);

#endif

if(*encoding != PHONE_ENCODING_DATA)

return 0; /* not for us */

if(_smscrypt_secret(plugin, number) != 0)

return 0; /* XXX warn */

for(i = 0; i < *len; i++)

{

(*buf)[i] ^= smscrypt->buf[j];

smscrypt->buf[j++] ^= (*buf)[i];

if(j != smscrypt->len)

continue;

SHA1_Init(&sha1);

SHA1_Update(&sha1, smscrypt->buf, smscrypt->len);

SHA1_Final(smscrypt->buf, &sha1);

j = 0;

}

*encoding = PHONE_ENCODING_UTF8;

_smscrypt_clear(plugin);

return 0;

}

static int _smscrypt_event_sms_sending(PhonePlugin * plugin,

char const * number, PhoneEncoding * encoding, char ** buf,

size_t * len)

{

SMSCrypt * smscrypt = plugin->priv;

size_t i;

size_t j = 0;

SHA_CTX sha1;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s(\"%s\", %u, buf, %lu)\n", __func__, number,

*encoding, *len);

#endif

if(*encoding != PHONE_ENCODING_UTF8)

return 0; /* not for us */

if(_smscrypt_secret(plugin, number) != 0)

return 0; /* XXX warn and cancel if relevant */

*encoding = PHONE_ENCODING_DATA;

for(i = 0; i < *len; i++)

{

(*buf)[i] ^= smscrypt->buf[j];

smscrypt->buf[j++] = (*buf)[i];

if(j != smscrypt->len)

continue;

SHA1_Init(&sha1);

SHA1_Update(&sha1, smscrypt->buf, smscrypt->len);

SHA1_Final(smscrypt->buf, &sha1);

j = 0;

}

*encoding = PHONE_ENCODING_DATA;

_smscrypt_clear(plugin);

return 0;

}

/* smscrypt_secret */

static int _smscrypt_secret(PhonePlugin * plugin, char const * number)

{

SMSCrypt * smscrypt = plugin->priv;

char const * secret = NULL;

SHA_CTX sha1;

if(number != NULL)

secret = plugin->helper->config_get(plugin->helper->phone,

"smscrypt", number);

if(secret == NULL)

secret = plugin->helper->config_get(plugin->helper->phone,

"smscrypt", "secret");

if(secret == NULL)

return 1;

SHA1_Init(&sha1);

SHA1_Update(&sha1, (unsigned char const *)secret, strlen(secret));

SHA1_Final(smscrypt->buf, &sha1);

return 0;

}

/* smscrypt_settings */

static gboolean _on_settings_closex(gpointer data);

static void _on_settings_delete(gpointer data);

static void _on_settings_new(gpointer data);

static void _on_settings_number_edited(GtkCellRenderer * renderer, gchar * arg1,

gchar * arg2, gpointer data);

static void _on_settings_secret_edited(GtkCellRenderer * renderer, gchar * arg1,

gchar * arg2, gpointer data);

static void _smscrypt_settings(PhonePlugin * plugin)

{

SMSCrypt * smscrypt = plugin->priv;

GtkWidget * vbox;

GtkWidget * widget;

GtkToolItem * toolitem;

GtkCellRenderer * renderer;

GtkTreeViewColumn * column;

if(smscrypt->window != NULL)

{

gtk_window_present(GTK_WINDOW(smscrypt->window));

return;

}

smscrypt->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

gtk_window_set_default_size(GTK_WINDOW(smscrypt->window), 200, 300);

#if GTK_CHECK_VERSION(2, 6, 0)

/* XXX find something more appropriate */

gtk_window_set_icon_name(GTK_WINDOW(smscrypt->window), "smscrypt");

#endif

gtk_window_set_title(GTK_WINDOW(smscrypt->window), "SMS encryption");

g_signal_connect_swapped(G_OBJECT(smscrypt->window), "delete-event",

G_CALLBACK(_on_settings_closex), plugin);

vbox = gtk_vbox_new(FALSE, 0);

/* toolbar */

widget = gtk_toolbar_new();

toolitem = gtk_tool_button_new_from_stock(GTK_STOCK_NEW);

g_signal_connect_swapped(G_OBJECT(toolitem), "clicked", G_CALLBACK(

_on_settings_new), plugin);

gtk_toolbar_insert(GTK_TOOLBAR(widget), toolitem, -1);

toolitem = gtk_tool_button_new_from_stock(GTK_STOCK_DELETE);

g_signal_connect_swapped(G_OBJECT(toolitem), "clicked", G_CALLBACK(

_on_settings_delete), plugin);

gtk_toolbar_insert(GTK_TOOLBAR(widget), toolitem, -1);

gtk_box_pack_start(GTK_BOX(vbox), widget, FALSE, TRUE, 0);

/* view */

widget = gtk_scrolled_window_new(NULL, NULL);

gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(widget),

GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

smscrypt->view = gtk_tree_view_new_with_model(GTK_TREE_MODEL(

smscrypt->store));

renderer = gtk_cell_renderer_text_new();

g_object_set(G_OBJECT(renderer), "editable", TRUE, NULL);

g_signal_connect(G_OBJECT(renderer), "edited", G_CALLBACK(

_on_settings_number_edited), plugin);

column = gtk_tree_view_column_new_with_attributes("Number",

renderer, "text", 0, NULL);

gtk_tree_view_append_column(GTK_TREE_VIEW(smscrypt->view), column);

renderer = gtk_cell_renderer_text_new();

g_object_set(G_OBJECT(renderer), "editable", TRUE, NULL);

g_signal_connect(G_OBJECT(renderer), "edited", G_CALLBACK(

_on_settings_secret_edited), plugin);

column = gtk_tree_view_column_new_with_attributes("Secret",

renderer, "text", 1, NULL);

gtk_tree_view_append_column(GTK_TREE_VIEW(smscrypt->view), column);

gtk_container_add(GTK_CONTAINER(widget), smscrypt->view);

gtk_box_pack_start(GTK_BOX(vbox), widget, TRUE, TRUE, 0);

gtk_container_add(GTK_CONTAINER(smscrypt->window), vbox);

gtk_widget_show_all(smscrypt->window);

}

static gboolean _on_settings_closex(gpointer data)

{

PhonePlugin * plugin = data;

SMSCrypt * smscrypt = plugin->priv;

gtk_widget_hide(smscrypt->window);

return TRUE;

}

static void _on_settings_delete(gpointer data)

{

PhonePlugin * plugin = data;

SMSCrypt * smscrypt = plugin->priv;

GtkTreeSelection * treesel;

GtkTreeIter iter;

char * number = NULL;

if((treesel = gtk_tree_view_get_selection(GTK_TREE_VIEW(

smscrypt->view))) == NULL)

return;

if(gtk_tree_selection_get_selected(treesel, NULL, &iter) != TRUE)

return;

gtk_tree_model_get(GTK_TREE_MODEL(smscrypt->store), &iter, 0, &number,

-1);

if(number == NULL)

return;

plugin->helper->config_set(plugin->helper->phone, "smscrypt", number,

NULL);

gtk_list_store_remove(smscrypt->store, &iter);

g_free(number);

}

static void _on_settings_new(gpointer data)

{

PhonePlugin * plugin = data;

SMSCrypt * smscrypt = plugin->priv;

GtkTreeIter iter;

gtk_list_store_append(smscrypt->store, &iter);

gtk_list_store_set(smscrypt->store, &iter, 0, "number", -1);

}

static void _on_settings_number_edited(GtkCellRenderer * renderer, gchar * arg1,

gchar * arg2, gpointer data)

{

PhonePlugin * plugin = data;

SMSCrypt * smscrypt = plugin->priv;

GtkTreeModel * model = GTK_TREE_MODEL(smscrypt->store);

GtkTreeIter iter;

char * number = NULL;

char const * secret;

if(gtk_tree_model_get_iter_from_string(model, &iter, arg1) == TRUE)

gtk_tree_model_get(model, &iter, 0, &number, -1);

if(number == NULL)

return;

/* FIXME check that there are no duplicates */

secret = plugin->helper->config_get(plugin->helper->phone, "smscrypt",

number);

if(plugin->helper->config_set(plugin->helper->phone, "smscrypt", arg2,

secret) == 0

&& plugin->helper->config_set(plugin->helper->phone,

"smscrypt", number, NULL) == 0)

gtk_list_store_set(smscrypt->store, &iter, 0, arg2, -1);

g_free(number);

}

static void _on_settings_secret_edited(GtkCellRenderer * renderer, gchar * arg1,

gchar * arg2, gpointer data)

{

PhonePlugin * plugin = data;

SMSCrypt * smscrypt = plugin->priv;

GtkTreeModel * model = GTK_TREE_MODEL(smscrypt->store);

GtkTreeIter iter;

char * number = NULL;

if(gtk_tree_model_get_iter_from_string(model, &iter, arg1) == TRUE)

gtk_tree_model_get(model, &iter, 0, &number, -1);

if(number == NULL)

return;

if(plugin->helper->config_set(plugin->helper->phone, "smscrypt", number,

arg2) == 0)

gtk_list_store_set(smscrypt->store, &iter, 1, arg2, -1);

g_free(number);

}