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telegram-purple/telegram-base.c
mjentsch 1dda956166 Support secret chats 
Load and store secret chats in a file, handle secret chat updates, visualize fingerprint in settings
2015-01-04 12:36:13 +01:00

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/*
This file is part of telegram-purple
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 02111-1301 USA
Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres 2014
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <assert.h>
#include <tgl.h>
#include <tgl-binlog.h>
#include <glib.h>
#include <request.h>
#include <openssl/sha.h>
#include "telegram-purple.h"
#include "msglog.h"
#include "tgp-2prpl.h"
#include "tgp-structs.h"
#include "lodepng/lodepng.h"
#define DC_SERIALIZED_MAGIC 0x868aa81d
#define STATE_FILE_MAGIC 0x28949a93
#define SECRET_CHAT_FILE_MAGIC 0x37a1988a
void read_state_file (struct tgl_state *TLS) {
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "state") < 0) {
return;
}
int state_file_fd = open (name, O_CREAT | O_RDWR, 0600);
free (name);
if (state_file_fd < 0) {
return;
}
int version, magic;
if (read (state_file_fd, &magic, 4) < 4) { close (state_file_fd); return; }
if (magic != (int)STATE_FILE_MAGIC) { close (state_file_fd); return; }
if (read (state_file_fd, &version, 4) < 4 || version < 0) { close (state_file_fd); return; }
int x[4];
if (read (state_file_fd, x, 16) < 16) {
close (state_file_fd);
return;
}
int pts = x[0];
int qts = x[1];
int seq = x[2];
int date = x[3];
close (state_file_fd);
bl_do_set_seq (TLS, seq);
bl_do_set_pts (TLS, pts);
bl_do_set_qts (TLS, qts);
bl_do_set_date (TLS, date);
}
void write_state_file (struct tgl_state *TLS) {
int wseq;
int wpts;
int wqts;
int wdate;
wseq = TLS->seq; wpts = TLS->pts; wqts = TLS->qts; wdate = TLS->date;
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "state") < 0) {
return;
}
int state_file_fd = open (name, O_CREAT | O_RDWR, 0600);
free (name);
if (state_file_fd < 0) {
return;
}
int x[6];
x[0] = STATE_FILE_MAGIC;
x[1] = 0;
x[2] = wpts;
x[3] = wqts;
x[4] = wseq;
x[5] = wdate;
assert (write (state_file_fd, x, 24) == 24);
close (state_file_fd);
}
void write_dc (struct tgl_dc *DC, void *extra) {
int auth_file_fd = *(int *)extra;
if (!DC) {
int x = 0;
assert (write (auth_file_fd, &x, 4) == 4);
return;
} else {
int x = 1;
assert (write (auth_file_fd, &x, 4) == 4);
}
assert (DC->has_auth);
assert (write (auth_file_fd, &DC->port, 4) == 4);
int l = strlen (DC->ip);
assert (write (auth_file_fd, &l, 4) == 4);
assert (write (auth_file_fd, DC->ip, l) == l);
assert (write (auth_file_fd, &DC->auth_key_id, 8) == 8);
assert (write (auth_file_fd, DC->auth_key, 256) == 256);
}
void write_auth_file (struct tgl_state *TLS) {
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "auth") < 0) {
return;
}
int auth_file_fd = open (name, O_CREAT | O_RDWR, 0600);
free (name);
if (auth_file_fd < 0) { return; }
int x = DC_SERIALIZED_MAGIC;
assert (write (auth_file_fd, &x, 4) == 4);
assert (write (auth_file_fd, &TLS->max_dc_num, 4) == 4);
assert (write (auth_file_fd, &TLS->dc_working_num, 4) == 4);
tgl_dc_iterator_ex (TLS, write_dc, &auth_file_fd);
assert (write (auth_file_fd, &TLS->our_id, 4) == 4);
close (auth_file_fd);
}
void read_dc (struct tgl_state *TLS, int auth_file_fd, int id, unsigned ver) {
int port = 0;
assert (read (auth_file_fd, &port, 4) == 4);
int l = 0;
assert (read (auth_file_fd, &l, 4) == 4);
assert (l >= 0 && l < 100);
char ip[100];
assert (read (auth_file_fd, ip, l) == l);
ip[l] = 0;
long long auth_key_id;
static unsigned char auth_key[256];
assert (read (auth_file_fd, &auth_key_id, 8) == 8);
assert (read (auth_file_fd, auth_key, 256) == 256);
//bl_do_add_dc (id, ip, l, port, auth_key_id, auth_key);
bl_do_dc_option (TLS, id, 2, "DC", l, ip, port);
bl_do_set_auth_key_id (TLS, id, auth_key);
bl_do_dc_signed (TLS, id);
}
int error_if_val_false (struct tgl_state *TLS, int val, const char *msg) {
if (!val) {
connection_data *conn = TLS->ev_base;
purple_connection_error_reason (conn->gc, PURPLE_CONNECTION_ERROR_AUTHENTICATION_FAILED, msg);
return 1;
}
return 0;
}
void empty_auth_file (struct tgl_state *TLS) {
if (TLS->test_mode) {
bl_do_dc_option (TLS, 1, 0, "", strlen (TG_SERVER_TEST_1), TG_SERVER_TEST_1, 443);
bl_do_dc_option (TLS, 2, 0, "", strlen (TG_SERVER_TEST_2), TG_SERVER_TEST_2, 443);
bl_do_dc_option (TLS, 3, 0, "", strlen (TG_SERVER_TEST_3), TG_SERVER_TEST_3, 443);
bl_do_set_working_dc (TLS, TG_SERVER_TEST_DEFAULT);
} else {
bl_do_dc_option (TLS, 1, 0, "", strlen (TG_SERVER_1), TG_SERVER_1, 443);
bl_do_dc_option (TLS, 2, 0, "", strlen (TG_SERVER_2), TG_SERVER_2, 443);
bl_do_dc_option (TLS, 3, 0, "", strlen (TG_SERVER_3), TG_SERVER_3, 443);
bl_do_dc_option (TLS, 4, 0, "", strlen (TG_SERVER_4), TG_SERVER_4, 443);
bl_do_dc_option (TLS, 5, 0, "", strlen (TG_SERVER_5), TG_SERVER_5, 443);
bl_do_set_working_dc (TLS, TG_SERVER_DEFAULT);;
}
}
void read_auth_file (struct tgl_state *TLS) {
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "auth") < 0) {
return;
}
int auth_file_fd = open (name, O_CREAT | O_RDWR, 0600);
free (name);
if (auth_file_fd < 0) {
empty_auth_file (TLS);
return;
}
assert (auth_file_fd >= 0);
unsigned x;
unsigned m;
if (read (auth_file_fd, &m, 4) < 4 || (m != DC_SERIALIZED_MAGIC)) {
close (auth_file_fd);
empty_auth_file (TLS);
return;
}
assert (read (auth_file_fd, &x, 4) == 4);
assert (x > 0);
int dc_working_num;
assert (read (auth_file_fd, &dc_working_num, 4) == 4);
int i;
for (i = 0; i <= (int)x; i++) {
int y;
assert (read (auth_file_fd, &y, 4) == 4);
if (y) {
read_dc (TLS, auth_file_fd, i, m);
}
}
bl_do_set_working_dc (TLS, dc_working_num);
int our_id;
int l = read (auth_file_fd, &our_id, 4);
if (l < 4) {
assert (!l);
}
if (our_id) {
bl_do_set_our_id (TLS, our_id);
}
close (auth_file_fd);
}
void write_secret_chat (tgl_peer_t *_P, void *extra) {
struct tgl_secret_chat *P = (void *)_P;
if (tgl_get_peer_type (P->id) != TGL_PEER_ENCR_CHAT) { return; }
if (P->state != sc_ok) { return; }
int *a = extra;
int fd = a[0];
a[1] ++;
int id = tgl_get_peer_id (P->id);
assert (write (fd, &id, 4) == 4);
//assert (write (fd, &P->flags, 4) == 4);
int l = strlen (P->print_name);
assert (write (fd, &l, 4) == 4);
assert (write (fd, P->print_name, l) == l);
assert (write (fd, &P->user_id, 4) == 4);
assert (write (fd, &P->admin_id, 4) == 4);
assert (write (fd, &P->date, 4) == 4);
assert (write (fd, &P->ttl, 4) == 4);
assert (write (fd, &P->layer, 4) == 4);
assert (write (fd, &P->access_hash, 8) == 8);
assert (write (fd, &P->state, 4) == 4);
assert (write (fd, &P->key_fingerprint, 8) == 8);
assert (write (fd, &P->key, 256) == 256);
assert (write (fd, &P->first_key_sha, 20) == 20);
assert (write (fd, &P->in_seq_no, 4) == 4);
assert (write (fd, &P->last_in_seq_no, 4) == 4);
assert (write (fd, &P->out_seq_no, 4) == 4);
}
void write_secret_chat_file (struct tgl_state *TLS) {
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "secret") < 0) {
return;
}
int secret_chat_fd = open (name, O_CREAT | O_RDWR, 0600);
free (name);
assert (secret_chat_fd >= 0);
int x = SECRET_CHAT_FILE_MAGIC;
assert (write (secret_chat_fd, &x, 4) == 4);
x = 2;
assert (write (secret_chat_fd, &x, 4) == 4); // version
assert (write (secret_chat_fd, &x, 4) == 4); // num
int y[2];
y[0] = secret_chat_fd;
y[1] = 0;
tgl_peer_iterator_ex (TLS, write_secret_chat, y);
lseek (secret_chat_fd, 8, SEEK_SET);
assert (write (secret_chat_fd, &y[1], 4) == 4);
close (secret_chat_fd);
}
void read_secret_chat (struct tgl_state *TLS, int fd, int v) {
int id, l, user_id, admin_id, date, ttl, layer, state;
long long access_hash, key_fingerprint;
static char s[1000];
static unsigned char key[256];
static unsigned char sha[20];
assert (read (fd, &id, 4) == 4);
//assert (read (fd, &flags, 4) == 4);
assert (read (fd, &l, 4) == 4);
assert (l > 0 && l < 1000);
assert (read (fd, s, l) == l);
assert (read (fd, &user_id, 4) == 4);
assert (read (fd, &admin_id, 4) == 4);
assert (read (fd, &date, 4) == 4);
assert (read (fd, &ttl, 4) == 4);
assert (read (fd, &layer, 4) == 4);
assert (read (fd, &access_hash, 8) == 8);
assert (read (fd, &state, 4) == 4);
assert (read (fd, &key_fingerprint, 8) == 8);
assert (read (fd, &key, 256) == 256);
if (v >= 2) {
assert (read (fd, sha, 20) == 20);
}
int in_seq_no = 0, out_seq_no = 0, last_in_seq_no = 0;
if (v >= 1) {
assert (read (fd, &in_seq_no, 4) == 4);
assert (read (fd, &last_in_seq_no, 4) == 4);
assert (read (fd, &out_seq_no, 4) == 4);
}
bl_do_encr_chat_create (TLS, id, user_id, admin_id, s, l);
struct tgl_secret_chat *P = (void *)tgl_peer_get (TLS, TGL_MK_ENCR_CHAT (id));
assert (P && (P->flags & FLAG_CREATED));
bl_do_encr_chat_set_date (TLS, P, date);
bl_do_encr_chat_set_ttl (TLS, P, ttl);
bl_do_encr_chat_set_layer (TLS ,P, layer);
bl_do_encr_chat_set_state (TLS, P, state);
bl_do_encr_chat_set_key (TLS, P, key, key_fingerprint);
if (v >= 2) {
bl_do_encr_chat_set_sha (TLS, P, sha);
} else {
SHA1 ((void *)key, 256, sha);
bl_do_encr_chat_set_sha (TLS, P, sha);
}
if (v >= 1) {
bl_do_encr_chat_set_seq (TLS, P, in_seq_no, last_in_seq_no, out_seq_no);
}
bl_do_encr_chat_set_access_hash (TLS, P, access_hash);
}
void read_secret_chat_file (struct tgl_state *TLS) {
char *name = 0;
if (asprintf (&name, "%s/%s", TLS->base_path, "secret") < 0) {
return;
}
int secret_chat_fd = open (name, O_RDWR, 0600);
free (name);
if (secret_chat_fd < 0) { return; }
int x;
if (read (secret_chat_fd, &x, 4) < 4) { close (secret_chat_fd); return; }
if (x != SECRET_CHAT_FILE_MAGIC) { close (secret_chat_fd); return; }
int v = 0;
assert (read (secret_chat_fd, &v, 4) == 4);
assert (v == 0 || v == 1 || v == 2); // version
assert (read (secret_chat_fd, &x, 4) == 4);
assert (x >= 0);
while (x -- > 0) {
read_secret_chat (TLS, secret_chat_fd, v);
}
close (secret_chat_fd);
}
void telegram_export_authorization (struct tgl_state *TLS);
void export_auth_callback (struct tgl_state *TLS, void *extra, int success) {
if (!error_if_val_false(TLS, success, "Authentication Export failed.")) {
telegram_export_authorization (TLS);
}
}
void telegram_export_authorization (struct tgl_state *TLS) {
int i;
for (i = 0; i <= TLS->max_dc_num; i++) if (TLS->DC_list[i] && !tgl_signed_dc (TLS, TLS->DC_list[i])) {
tgl_do_export_auth (TLS, i, export_auth_callback, (void*)(long)TLS->DC_list[i]);
return;
}
write_auth_file (TLS);
on_ready (TLS);
}
static void request_code (struct tgl_state *TLS);
static void request_name_and_code (struct tgl_state *TLS);
static void code_receive_result (struct tgl_state *TLS, void *extra, int success, struct tgl_user *U) {
if (!success) {
debug ("Bad code...\n");
request_code (TLS);
} else {
telegram_export_authorization (TLS);
}
}
static void code_auth_receive_result (struct tgl_state *TLS, void *extra, int success, struct tgl_user *U) {
if (!success) {
debug ("Bad code...\n");
request_name_and_code (TLS);
} else {
telegram_export_authorization (TLS);
}
}
void request_code_entered (gpointer data, const gchar *code) {
struct tgl_state *TLS = data;
connection_data *conn = TLS->ev_base;
char const *username = purple_account_get_username(conn->pa);
tgl_do_send_code_result (TLS, username, conn->hash, code, code_receive_result, 0) ;
}
static void request_code_canceled (gpointer data) {
struct tgl_state *TLS = data;
connection_data *conn = TLS->ev_base;
purple_connection_error_reason(conn->gc,
PURPLE_CONNECTION_ERROR_AUTHENTICATION_FAILED, "registration canceled");
}
static void request_name_code_entered (PurpleConnection* gc, PurpleRequestFields* fields) {
connection_data *conn = purple_connection_get_protocol_data(gc);
struct tgl_state *TLS = conn->TLS;
char const *username = purple_account_get_username(conn->pa);
const char* first = purple_request_fields_get_string(fields, "first_name");
const char* last = purple_request_fields_get_string(fields, "last_name");
const char* code = purple_request_fields_get_string(fields, "code");
if (!first || !last || !code) {
request_name_and_code (TLS);
return;
}
tgl_do_send_code_result_auth (TLS, username, conn->hash, code, first, last, code_auth_receive_result, NULL);
}
static void request_code (struct tgl_state *TLS) {
debug ("Client is not registered, registering...\n");
connection_data *conn = TLS->ev_base;
int compat = purple_account_get_bool (tg_get_acc(TLS), "compat-verification", 0);
if (compat || ! purple_request_input (conn->gc, "Telegram Code", "Enter Telegram Code",
"Telegram wants to verify your identity, please enter the code, that you have received via SMS.",
NULL, 0, 0, "code", "OK", G_CALLBACK(request_code_entered), "Cancel",
G_CALLBACK(request_code_canceled), conn->pa, NULL, NULL, TLS)) {
// purple request API is not available, so we create a new conversation (the Telegram system
// account "7770000") to prompt the user for the code
conn->in_fallback_chat = 1;
purple_connection_set_state (conn->gc, PURPLE_CONNECTED);
PurpleConversation *conv = purple_conversation_new (PURPLE_CONV_TYPE_IM, conn->pa, "777000");
purple_conversation_write (conv, "777000", "What is your SMS verification code?",
PURPLE_MESSAGE_RECV | PURPLE_MESSAGE_SYSTEM, 0);
}
}
static void request_name_and_code (struct tgl_state *TLS) {
debug ("Phone is not registered, registering...\n");
connection_data *conn = TLS->ev_base;
PurpleRequestFields* fields = purple_request_fields_new();
PurpleRequestField* field = 0;
PurpleRequestFieldGroup* group = purple_request_field_group_new("Registration");
field = purple_request_field_string_new("first_name", "First Name", "", 0);
purple_request_field_group_add_field(group, field);
field = purple_request_field_string_new("last_name", "Last Name", "", 0);
purple_request_field_group_add_field(group, field);
purple_request_fields_add_group(fields, group);
group = purple_request_field_group_new("Authorization");
field = purple_request_field_string_new("code", "Telegram Code", "", 0);
purple_request_field_group_add_field(group, field);
purple_request_fields_add_group(fields, group);
if (!purple_request_fields (conn->gc, "Register", "Please register your phone number.", NULL, fields, "Ok",
G_CALLBACK( request_name_code_entered ), "Cancel", NULL, conn->pa, NULL, NULL, conn->gc)) {
// purple_request API not available
const char *error = "Phone number is not registered, please register your phone on a different client.";
purple_connection_error_reason (conn->gc, PURPLE_CONNECTION_ERROR_AUTHENTICATION_FAILED, error);
purple_notify_error(_telegram_protocol, "Not Registered", "Not Registered", error);
}
}
static void sign_in_callback (struct tgl_state *TLS, void *extra, int success, int registered, const char *mhash) {
connection_data *conn = TLS->ev_base;
if (!error_if_val_false (TLS, success, "Invalid or non-existing phone number.")) {
conn->hash = strdup (mhash);
if (registered) {
request_code (TLS);
} else {
request_name_and_code (TLS);
}
}
}
static void telegram_send_sms (struct tgl_state *TLS) {
if (tgl_signed_dc (TLS, TLS->DC_working)) {
telegram_export_authorization (TLS);
return;
}
connection_data *conn = TLS->ev_base;
char const *username = purple_account_get_username(conn->pa);
tgl_do_send_code (TLS, username, sign_in_callback, 0);
}
static int all_authorized (struct tgl_state *TLS) {
int i;
for (i = 0; i <= TLS->max_dc_num; i++) if (TLS->DC_list[i]) {
if (!tgl_authorized_dc (TLS, TLS->DC_list[i])) {
return 0;
}
}
return 1;
}
static int check_all_authorized (gpointer arg) {
struct tgl_state *TLS = arg;
if (all_authorized (TLS)) {
telegram_send_sms (TLS);
return FALSE;
} else {
return TRUE;
}
}
void telegram_login (struct tgl_state *TLS) {
read_auth_file (TLS);
read_state_file (TLS);
read_secret_chat_file (TLS);
if (all_authorized (TLS)) {
telegram_send_sms (TLS);
return;
}
purple_timeout_add (100, check_all_authorized, TLS);
}
PurpleConversation *chat_show (PurpleConnection *gc, int id) {
debug ("show chat");
connection_data *conn = purple_connection_get_protocol_data(gc);
PurpleConversation *convo = purple_find_chat(gc, id);
if (! convo) {
gchar *name = g_strdup_printf ("%d", id);
if (! g_hash_table_contains (conn->joining_chats, name)) {
g_hash_table_insert(conn->joining_chats, name, 0);
tgl_do_get_chat_info (conn->TLS, TGL_MK_CHAT(id), 0, on_chat_get_info, NULL);
} else {
g_free(name);
}
}
return convo;
}
int chat_add_message (struct tgl_state *TLS, struct tgl_message *M, char *text) {
connection_data *conn = TLS->ev_base;
if (chat_show (conn->gc, tgl_get_peer_id (M->to_id))) {
p2tgl_got_chat_in(TLS, M->to_id, M->from_id, text ? text : M->message,
M->service ? PURPLE_MESSAGE_SYSTEM : PURPLE_MESSAGE_RECV, M->date);
pending_reads_add (conn->pending_reads, M->to_id);
if (p2tgl_status_is_present(purple_account_get_active_status(conn->pa))) {
pending_reads_send_all (conn->pending_reads, conn->TLS);
}
return 1;
} else {
// add message once the chat was initialised
struct message_text *mt = message_text_init (M, text);
g_queue_push_tail (conn->new_messages, mt);
return 0;
}
}
void chat_add_all_users (PurpleConversation *pc, struct tgl_chat *chat) {
struct tgl_chat_user *curr = chat->user_list;
if (!curr) {
warning ("add_all_users_to_chat: chat contains no user list, cannot add users\n.");
return;
}
int i;
for (i = 0; i < chat->user_list_size; i++) {
struct tgl_chat_user *uid = (curr + i);
int flags = (chat->admin_id == uid->user_id ? PURPLE_CBFLAGS_FOUNDER : PURPLE_CBFLAGS_NONE);
p2tgl_conv_add_user(pc, *uid, NULL, flags, 0);
}
}
/**
* This function generates a png image to visualize the sha1 key from an encrypted chat.
*/
int generate_ident_icon (struct tgl_state *TLS, unsigned char* sha1_key)
{
int colors[4] = {
0xffffff,
0xd5e6f3,
0x2d5775,
0x2f99c9
};
unsigned img_size = 160;
unsigned char* image = (unsigned char*)malloc (img_size * img_size * 4);
assert (image);
unsigned x, y, i, j, idx = 0;
int bitpointer = 0;
for (y = 0; y < 8; y++)
{
unsigned offset_y = y * img_size * 4 * (img_size / 8);
for (x = 0; x < 8; x++)
{
int offset = bitpointer / 8;
int shiftOffset = bitpointer % 8;
int val = sha1_key[offset + 3] << 24 | sha1_key[offset + 2] << 16 | sha1_key[offset + 1] << 8 | sha1_key[offset];
idx = abs((val >> shiftOffset) & 3) % 4;
bitpointer += 2;
unsigned offset_x = x * 4 * (img_size / 8);
for (i = 0; i < img_size / 8; i++)
{
unsigned off_y = offset_y + i * img_size * 4;
for (j = 0; j < img_size / 8; j++)
{
unsigned off_x = offset_x + j * 4;
image[off_y + off_x + 0] = (colors[idx] >> 16) & 0xFF;
image[off_y + off_x + 1] = (colors[idx] >> 8) & 0xFF;
image[off_y + off_x + 2] = colors[idx] & 0xFF;
image[off_y + off_x + 3] = 0xFF;
}
}
}
}
unsigned char* png;
size_t pngsize;
unsigned error = lodepng_encode32(&png, &pngsize, image, img_size, img_size);
int imgStoreId = -1;
if(!error)
{
imgStoreId = purple_imgstore_add_with_id (png, pngsize, NULL);
used_images_add ((connection_data*)TLS->ev_base, imgStoreId);
}
g_free(image);
return imgStoreId;
}
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