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mtproto-client.c
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mtproto-client.c
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/*
This file is part of tgl-library
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Copyright Nikolay Durov, Andrey Lopatin 2012-2013
Vitaly Valtman 2013-2015
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _FILE_OFFSET_BITS 64
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#ifdef WIN32
#include <winsock2.h>
#else
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
#endif
#include "crypto/rand.h"
#include "crypto/rsa_pem.h"
#include "crypto/sha.h"
//#include "telegram.h"
#include "queries.h"
//#include "loop.h"
#include "tgl-structures.h"
#include "tgl-binlog.h"
#include "auto.h"
#include "auto/auto-types.h"
#include "auto/auto-skip.h"
#include "tgl.h"
#include "mtproto-client.h"
#include "tools.h"
#include "tree.h"
#include "updates.h"
#include "mtproto-utils.h"
#include "auto.h"
#include "tgl-methods-in.h"
#include "mtproto-common.h"
#define MAX_NET_RES (1L << 16)
//extern int log_level;
static long long generate_next_msg_id (struct tgl_state *TLS, struct tgl_dc *DC, struct tgl_session *S);
static double get_server_time (struct tgl_dc *DC);
// for statistic only
static int total_packets_sent;
static long long total_data_sent;
static int rpc_execute (struct tgl_state *TLS, struct connection *c, int op, int len);
static int rpc_becomes_ready (struct tgl_state *TLS, struct connection *c);
static int rpc_close (struct tgl_state *TLS, struct connection *c);
static double get_utime (int clock_id) {
struct timespec T;
tgl_my_clock_gettime (clock_id, &T);
return T.tv_sec + (double) T.tv_nsec * 1e-9;
}
#define MAX_RESPONSE_SIZE (1L << 24)
static TGLC_rsa *rsa_load_public_key (struct tgl_state *TLS, const char *public_key_name) {
FILE *f = fopen (public_key_name, "r");
if (f == NULL) {
vlogprintf (E_WARNING, "Couldn't open public key file: %s\n", public_key_name);
return NULL;
}
TGLC_rsa *res = TGLC_pem_read_RSAPublicKey (f);
fclose (f);
if (res == NULL) {
vlogprintf (E_WARNING, "TGLC_pem_read_RSAPublicKey returns NULL.\n");
return NULL;
}
vlogprintf (E_NOTICE, "public key '%s' loaded successfully\n", public_key_name);
return res;
}
/*
*
* UNAUTHORIZED (DH KEY EXCHANGE) PROTOCOL PART
*
*/
#define ENCRYPT_BUFFER_INTS 16384
static int encrypt_buffer[ENCRYPT_BUFFER_INTS];
#define DECRYPT_BUFFER_INTS 16384
static int decrypt_buffer[ENCRYPT_BUFFER_INTS];
static int encrypt_packet_buffer (struct tgl_state *TLS, struct tgl_dc *DC) {
TGLC_rsa *key = TLS->rsa_key_loaded[DC->rsa_key_idx];
return tgl_pad_rsa_encrypt (TLS, (char *) packet_buffer, (packet_ptr - packet_buffer) * 4, (char *) encrypt_buffer, ENCRYPT_BUFFER_INTS * 4, TGLC_rsa_n (key), TGLC_rsa_e (key));
}
static int encrypt_packet_buffer_aes_unauth (const char server_nonce[16], const char hidden_client_nonce[32]) {
tgl_init_aes_unauth (server_nonce, hidden_client_nonce, 1);
return tgl_pad_aes_encrypt ((char *) packet_buffer, (packet_ptr - packet_buffer) * 4, (char *) encrypt_buffer, ENCRYPT_BUFFER_INTS * 4);
}
//
// Used in unauthorized part of protocol
//
static int rpc_send_packet (struct tgl_state *TLS, struct connection *c) {
static struct {
long long auth_key_id;
long long out_msg_id;
int msg_len;
} unenc_msg_header;
int len = (packet_ptr - packet_buffer) * 4;
TLS->net_methods->incr_out_packet_num (c);
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
struct tgl_session *S = TLS->net_methods->get_session (c);
unenc_msg_header.out_msg_id = generate_next_msg_id (TLS, DC, S);
unenc_msg_header.msg_len = len;
int total_len = len + 20;
assert (total_len > 0 && !(total_len & 0xfc000003));
total_len >>= 2;
vlogprintf (E_DEBUG, "writing packet: total_len = %d, len = %d\n", total_len, len);
if (total_len < 0x7f) {
assert (TLS->net_methods->write_out (c, &total_len, 1) == 1);
} else {
total_len = (total_len << 8) | 0x7f;
assert (TLS->net_methods->write_out (c, &total_len, 4) == 4);
}
TLS->net_methods->write_out (c, &unenc_msg_header, 20);
TLS->net_methods->write_out (c, packet_buffer, len);
TLS->net_methods->flush_out (c);
total_packets_sent ++;
total_data_sent += total_len;
return 1;
}
static int rpc_send_message (struct tgl_state *TLS, struct connection *c, void *data, int len) {
assert (len > 0 && !(len & 0xfc000003));
int total_len = len >> 2;
if (total_len < 0x7f) {
assert (TLS->net_methods->write_out (c, &total_len, 1) == 1);
} else {
total_len = (total_len << 8) | 0x7f;
assert (TLS->net_methods->write_out (c, &total_len, 4) == 4);
}
TLS->net_methods->incr_out_packet_num (c);
assert (TLS->net_methods->write_out (c, data, len) == len);
TLS->net_methods->flush_out (c);
total_packets_sent ++;
total_data_sent += total_len;
return 1;
}
//
// State machine. See description at
// https://core.telegram.org/mtproto/auth_key
//
static int check_unauthorized_header (struct tgl_state *TLS) {
long long auth_key_id = fetch_long ();
if (auth_key_id) {
vlogprintf (E_ERROR, "ERROR: auth_key_id should be NULL\n");
return -1;
}
fetch_long (); // msg_id
int len = fetch_int ();
if (len != 4 * (in_end - in_ptr)) {
vlogprintf (E_ERROR, "ERROR: length mismatch\n");
return -1;
}
return 0;
}
/* {{{ REQ_PQ */
// req_pq#60469778 nonce:int128 = ResPQ
static int send_req_pq_packet (struct tgl_state *TLS, struct connection *c) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
assert (DC->state == st_init);
tglt_secure_random (DC->nonce, 16);
clear_packet ();
out_int (CODE_req_pq);
out_ints ((int *)DC->nonce, 4);
rpc_send_packet (TLS, c);
DC->state = st_reqpq_sent;
return 1;
}
// req_pq#60469778 nonce:int128 = ResPQ
static int send_req_pq_temp_packet (struct tgl_state *TLS, struct connection *c) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
assert (DC->state == st_authorized);
tglt_secure_random (DC->nonce, 16);
clear_packet ();
out_int (CODE_req_pq);
out_ints ((int *)DC->nonce, 4);
rpc_send_packet (TLS, c);
DC->state = st_reqpq_sent_temp;
return 1;
}
/* }}} */
/* {{{ REQ DH */
// req_DH_params#d712e4be nonce:int128 server_nonce:int128 p:string q:string public_key_fingerprint:long encrypted_data:string = Server_DH_Params;
// p_q_inner_data#83c95aec pq:string p:string q:string nonce:int128 server_nonce:int128 new_nonce:int256 = P_Q_inner_data;
// p_q_inner_data_temp#3c6a84d4 pq:string p:string q:string nonce:int128 server_nonce:int128 new_nonce:int256 expires_in:int = P_Q_inner_data;
static void send_req_dh_packet (struct tgl_state *TLS, struct connection *c, TGLC_bn *pq, int temp_key) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
TGLC_bn *p = TGLC_bn_new ();
TGLC_bn *q = TGLC_bn_new ();
assert (bn_factorize (pq, p, q) >= 0);
clear_packet ();
packet_ptr += 5;
out_int (temp_key ? CODE_p_q_inner_data_temp : CODE_p_q_inner_data);
out_bignum (pq);
out_bignum (p);
out_bignum (q);
out_ints ((int *) DC->nonce, 4);
out_ints ((int *) DC->server_nonce, 4);
tglt_secure_random (DC->new_nonce, 32);
out_ints ((int *) DC->new_nonce, 8);
if (temp_key) {
out_int (TLS->temp_key_expire_time);
}
TGLC_sha1 ((unsigned char *) (packet_buffer + 5), (packet_ptr - packet_buffer - 5) * 4, (unsigned char *) packet_buffer);
int l = encrypt_packet_buffer (TLS, DC);
clear_packet ();
out_int (CODE_req_DH_params);
out_ints ((int *) DC->nonce, 4);
out_ints ((int *) DC->server_nonce, 4);
out_bignum (p);
out_bignum (q);
out_long (TLS->rsa_key_fingerprint[DC->rsa_key_idx]);
out_cstring ((char *) encrypt_buffer, l);
TGLC_bn_free (p);
TGLC_bn_free (q);
DC->state = temp_key ? st_reqdh_sent_temp : st_reqdh_sent;
rpc_send_packet (TLS, c);
}
/* }}} */
/* {{{ SEND DH PARAMS */
// set_client_DH_params#f5045f1f nonce:int128 server_nonce:int128 encrypted_data:string = Set_client_DH_params_answer;
// client_DH_inner_data#6643b654 nonce:int128 server_nonce:int128 retry_id:long g_b:string = Client_DH_Inner_Data
static void send_dh_params (struct tgl_state *TLS, struct connection *c, TGLC_bn *dh_prime, TGLC_bn *g_a, int g, int temp_key) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
clear_packet ();
packet_ptr += 5;
out_int (CODE_client_DH_inner_data);
out_ints ((int *) DC->nonce, 4);
out_ints ((int *) DC->server_nonce, 4);
out_long (0);
TGLC_bn *dh_g = TGLC_bn_new ();
ensure (TGLC_bn_set_word (dh_g, g));
static unsigned char s_power[256];
tglt_secure_random (s_power, 256);
TGLC_bn *dh_power = TGLC_bn_bin2bn ((unsigned char *)s_power, 256, 0);
ensure_ptr (dh_power);
TGLC_bn *y = TGLC_bn_new ();
ensure_ptr (y);
ensure (TGLC_bn_mod_exp (y, dh_g, dh_power, dh_prime, TLS->TGLC_bn_ctx));
out_bignum (y);
TGLC_bn_free (y);
TGLC_bn *auth_key_num = TGLC_bn_new ();
ensure (TGLC_bn_mod_exp (auth_key_num, g_a, dh_power, dh_prime, TLS->TGLC_bn_ctx));
int l = TGLC_bn_num_bytes (auth_key_num);
assert (l >= 250 && l <= 256);
assert (TGLC_bn_bn2bin (auth_key_num, (unsigned char *)(temp_key ? DC->temp_auth_key : DC->auth_key)));
if (l < 256) {
char *key = temp_key ? DC->temp_auth_key : DC->auth_key;
memmove (key + 256 - l, key, l);
memset (key, 0, 256 - l);
}
TGLC_bn_free (dh_power);
TGLC_bn_free (auth_key_num);
TGLC_bn_free (dh_g);
TGLC_sha1 ((unsigned char *) (packet_buffer + 5), (packet_ptr - packet_buffer - 5) * 4, (unsigned char *) packet_buffer);
l = encrypt_packet_buffer_aes_unauth (DC->server_nonce, DC->new_nonce);
clear_packet ();
out_int (CODE_set_client_DH_params);
out_ints ((int *) DC->nonce, 4);
out_ints ((int *) DC->server_nonce, 4);
out_cstring ((char *) encrypt_buffer, l);
DC->state = temp_key ? st_client_dh_sent_temp : st_client_dh_sent;;
rpc_send_packet (TLS, c);
}
/* }}} */
/* {{{ RECV RESPQ */
// resPQ#05162463 nonce:int128 server_nonce:int128 pq:string server_public_key_fingerprints:Vector long = ResPQ
static int process_respq_answer (struct tgl_state *TLS, struct connection *c, char *packet, int len, int temp_key) {
assert (!(len & 3));
in_ptr = (int *)packet;
in_end = in_ptr + (len / 4);
if (check_unauthorized_header (TLS) < 0) {
return -1;
}
int *in_save = in_ptr;
if (skip_type_any (TYPE_TO_PARAM (res_p_q)) < 0 || in_ptr != in_end) {
vlogprintf (E_ERROR, "can not parse req_p_q answer\n");
return -1;
}
in_ptr = in_save;
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
assert (fetch_int() == CODE_res_p_q);
static int tmp[4];
fetch_ints (tmp, 4);
if (memcmp (tmp, DC->nonce, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
fetch_ints (DC->server_nonce, 4);
TGLC_bn *pq = TGLC_bn_new ();
assert (fetch_bignum (pq) >= 0);
assert (fetch_int () == CODE_vector);
int fingerprints_num = fetch_int ();
assert (fingerprints_num >= 0);
DC->rsa_key_idx = -1;
int i;
for (i = 0; i < fingerprints_num; i++) {
int j;
long long fprint = fetch_long ();
for (j = 0; j < TLS->rsa_key_num; j++) {
if (TLS->rsa_key_loaded[j]) {
if (fprint == TLS->rsa_key_fingerprint[j]) {
DC->rsa_key_idx = j;
break;
}
}
}
}
assert (in_ptr == in_end);
if (DC->rsa_key_idx == -1) {
vlogprintf (E_ERROR, "fatal: don't have any matching keys\n");
return -1;
}
send_req_dh_packet (TLS, c, pq, temp_key);
TGLC_bn_free (pq);
return 1;
}
/* }}} */
/* {{{ RECV DH */
// server_DH_params_fail#79cb045d nonce:int128 server_nonce:int128 new_nonce_hash:int128 = Server_DH_Params;
// server_DH_params_ok#d0e8075c nonce:int128 server_nonce:int128 encrypted_answer:string = Server_DH_Params;
// server_DH_inner_data#b5890dba nonce:int128 server_nonce:int128 g:int dh_prime:string g_a:string server_time:int = Server_DH_inner_data;
static int process_dh_answer (struct tgl_state *TLS, struct connection *c, char *packet, int len, int temp_key) {
assert (!(len & 3));
in_ptr = (int *)packet;
in_end = in_ptr + (len / 4);
if (check_unauthorized_header (TLS) < 0) {
return -1;
}
int *in_save = in_ptr;
if (skip_type_any (TYPE_TO_PARAM (server_d_h_params)) < 0 || in_ptr != in_end) {
vlogprintf (E_ERROR, "can not parse server_DH_params answer\n");
return -1;
}
in_ptr = in_save;
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
unsigned op = fetch_int ();
assert (op == CODE_server__d_h_params_ok || op == CODE_server__d_h_params_fail);
int tmp[4];
fetch_ints (tmp, 4);
if (memcmp (tmp, DC->nonce, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
assert (!memcmp (tmp, DC->nonce, 16));
fetch_ints (tmp, 4);
if (memcmp (tmp, DC->server_nonce, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
assert (!memcmp (tmp, DC->server_nonce, 16));
if (op == CODE_server__d_h_params_fail) {
vlogprintf (E_ERROR, "DH params fail\n");
return -1;
}
tgl_init_aes_unauth (DC->server_nonce, DC->new_nonce, 0);
int l = prefetch_strlen ();
assert (l >= 0);
if (!l) {
vlogprintf (E_ERROR, "non-empty encrypted part expected\n");
return -1;
}
l = tgl_pad_aes_decrypt (fetch_str (l), l, (char *) decrypt_buffer, DECRYPT_BUFFER_INTS * 4 - 16);
assert (in_ptr == in_end);
in_ptr = decrypt_buffer + 5;
in_end = decrypt_buffer + (l >> 2);
if (skip_type_any (TYPE_TO_PARAM (server_d_h_inner_data)) < 0) {
vlogprintf (E_ERROR, "can not parse server_DH_inner_data answer\n");
return -1;
}
in_ptr = decrypt_buffer + 5;
assert (fetch_int () == (int)CODE_server_DH_inner_data);
fetch_ints (tmp, 4);
if (memcmp (tmp, DC->nonce, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
assert (!memcmp (tmp, DC->nonce, 16));
fetch_ints (tmp, 4);
if (memcmp (tmp, DC->server_nonce, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
assert (!memcmp (tmp, DC->server_nonce, 16));
int g = fetch_int ();
TGLC_bn *dh_prime = TGLC_bn_new ();
TGLC_bn *g_a = TGLC_bn_new ();
assert (fetch_bignum (dh_prime) > 0);
assert (fetch_bignum (g_a) > 0);
if (tglmp_check_DH_params (TLS, dh_prime, g) < 0) {
vlogprintf (E_ERROR, "bad DH params\n");
return -1;
}
if (tglmp_check_g_a (TLS, dh_prime, g_a) < 0) {
vlogprintf (E_ERROR, "bad dh_prime\n");
return -1;
}
int server_time = fetch_int ();
assert (in_ptr <= in_end);
static char sha1_buffer[20];
TGLC_sha1 ((unsigned char *) decrypt_buffer + 20, (in_ptr - decrypt_buffer - 5) * 4, (unsigned char *) sha1_buffer);
if (memcmp (decrypt_buffer, sha1_buffer, 20)) {
vlogprintf (E_ERROR, "bad encrypted message SHA1\n");
return -1;
}
if ((char *) in_end - (char *) in_ptr >= 16) {
vlogprintf (E_ERROR, "too much padding\n");
return -1;
}
DC->server_time_delta = server_time - get_utime (CLOCK_REALTIME);
DC->server_time_udelta = server_time - get_utime (CLOCK_MONOTONIC);
send_dh_params (TLS, c, dh_prime, g_a, g, temp_key);
TGLC_bn_free (dh_prime);
TGLC_bn_free (g_a);
return 1;
}
/* }}} */
static void create_temp_auth_key (struct tgl_state *TLS, struct connection *c) {
assert (TLS->enable_pfs);
send_req_pq_temp_packet (TLS, c);
}
int tglmp_encrypt_inner_temp (struct tgl_state *TLS, struct connection *c, int *msg, int msg_ints, int useful, void *data, long long msg_id);
static long long msg_id_override;
static void mpc_on_get_config (struct tgl_state *TLS, void *extra, int success);
static void bind_temp_auth_key (struct tgl_state *TLS, struct connection *c);
/* {{{ RECV AUTH COMPLETE */
// dh_gen_ok#3bcbf734 nonce:int128 server_nonce:int128 new_nonce_hash1:int128 = Set_client_DH_params_answer;
// dh_gen_retry#46dc1fb9 nonce:int128 server_nonce:int128 new_nonce_hash2:int128 = Set_client_DH_params_answer;
// dh_gen_fail#a69dae02 nonce:int128 server_nonce:int128 new_nonce_hash3:int128 = Set_client_DH_params_answer;
static int process_auth_complete (struct tgl_state *TLS, struct connection *c, char *packet, int len, int temp_key) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
assert (!(len & 3));
in_ptr = (int *)packet;
in_end = in_ptr + (len / 4);
if (check_unauthorized_header (TLS) < 0) {
return -1;
}
int *in_save = in_ptr;
if (skip_type_any (TYPE_TO_PARAM (set_client_d_h_params_answer)) < 0 || in_ptr != in_end) {
vlogprintf (E_ERROR, "can not parse server_DH_params answer\n");
return -1;
}
in_ptr = in_save;
unsigned op = fetch_int ();
assert (op == CODE_dh_gen_ok || op == CODE_dh_gen_retry || op == CODE_dh_gen_fail);
int tmp[4];
fetch_ints (tmp, 4);
if (memcmp (DC->nonce, tmp, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
fetch_ints (tmp, 4);
if (memcmp (DC->server_nonce, tmp, 16)) {
vlogprintf (E_ERROR, "nonce mismatch\n");
return -1;
}
if (op != CODE_dh_gen_ok) {
vlogprintf (E_ERROR, "something bad. Retry regen\n");
return -1;
}
fetch_ints (tmp, 4);
static unsigned char th[44], sha1_buffer[20];
memcpy (th, DC->new_nonce, 32);
th[32] = 1;
if (!temp_key) {
TGLC_sha1 ((unsigned char *)DC->auth_key, 256, sha1_buffer);
} else {
TGLC_sha1 ((unsigned char *)DC->temp_auth_key, 256, sha1_buffer);
}
memcpy (th + 33, sha1_buffer, 8);
TGLC_sha1 (th, 41, sha1_buffer);
if (memcmp (tmp, sha1_buffer + 4, 16)) {
vlogprintf (E_ERROR, "hash mismatch\n");
return -1;
}
if (!temp_key) {
bl_do_set_auth_key (TLS, DC->id, (unsigned char *)DC->auth_key);
TGLC_sha1 ((unsigned char *)DC->auth_key, 256, sha1_buffer);
} else {
TGLC_sha1 ((unsigned char *)DC->temp_auth_key, 256, sha1_buffer);
DC->temp_auth_key_id = *(long long *)(sha1_buffer + 12);
}
DC->server_salt = *(long long *)DC->server_nonce ^ *(long long *)DC->new_nonce;
DC->state = st_authorized;
vlogprintf (E_DEBUG, "Auth success\n");
if (temp_key) {
bind_temp_auth_key (TLS, c);
} else {
DC->flags |= 1;
if (TLS->enable_pfs) {
assert (TLS->enable_pfs);
create_temp_auth_key (TLS, c);
} else {
DC->temp_auth_key_id = DC->auth_key_id;
memcpy (DC->temp_auth_key, DC->auth_key, 256);
DC->flags |= 2;
if (!(DC->flags & 4)) {
tgl_do_help_get_config_dc (TLS, DC, mpc_on_get_config, DC);
}
}
}
return 1;
}
/* }}} */
static void bind_temp_auth_key (struct tgl_state *TLS, struct connection *c) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
if (DC->temp_auth_key_bind_query_id) {
tglq_query_delete (TLS, DC->temp_auth_key_bind_query_id);
}
struct tgl_session *S = TLS->net_methods->get_session (c);
long long msg_id = generate_next_msg_id (TLS, DC, S);
clear_packet ();
out_int (CODE_bind_auth_key_inner);
long long rand;
tglt_secure_random (&rand, 8);
out_long (rand);
out_long (DC->temp_auth_key_id);
out_long (DC->auth_key_id);
if (!S->session_id) {
tglt_secure_random (&S->session_id, 8);
}
out_long (S->session_id);
int expires = time (0) + DC->server_time_delta + TLS->temp_key_expire_time;
out_int (expires);
static int data[1000];
int len = tglmp_encrypt_inner_temp (TLS, c, packet_buffer, packet_ptr - packet_buffer, 0, data, msg_id);
msg_id_override = msg_id;
DC->temp_auth_key_bind_query_id = msg_id;
tgl_do_send_bind_temp_key (TLS, DC, rand, expires, (void *)data, len, msg_id);
msg_id_override = 0;
}
/*
*
* AUTHORIZED (MAIN) PROTOCOL PART
*
*/
static struct encrypted_message enc_msg;
static double get_server_time (struct tgl_dc *DC) {
//if (!DC->server_time_udelta) {
// DC->server_time_udelta = get_utime (CLOCK_REALTIME) - get_utime (CLOCK_MONOTONIC);
//}
return get_utime (CLOCK_MONOTONIC) + DC->server_time_udelta;
}
static long long generate_next_msg_id (struct tgl_state *TLS, struct tgl_dc *DC, struct tgl_session *S) {
long long next_id = (long long) (get_server_time (DC) * (1LL << 32)) & -4;
if (next_id <= TLS->last_msg_id) {
next_id = TLS->last_msg_id += 4;
} else {
TLS->last_msg_id = next_id;
}
S->last_msg_id = next_id; // See tglmp_encrypt_send_message
return next_id;
}
static void init_enc_msg (struct tgl_state *TLS, struct tgl_session *S, int useful) {
struct tgl_dc *DC = S->dc;
assert (DC->state == st_authorized);
assert (DC->temp_auth_key_id);
vlogprintf (E_DEBUG, "temp_auth_key_id = 0x%016" INT64_PRINTF_MODIFIER "x, auth_key_id = 0x%016" INT64_PRINTF_MODIFIER "x\n", DC->temp_auth_key_id, DC->auth_key_id);
enc_msg.auth_key_id = DC->temp_auth_key_id;
enc_msg.server_salt = DC->server_salt;
if (!S->session_id) {
tglt_secure_random (&S->session_id, 8);
}
enc_msg.session_id = S->session_id;
enc_msg.msg_id = msg_id_override ? msg_id_override : generate_next_msg_id (TLS, DC, S);
enc_msg.seq_no = S->seq_no;
if (useful) {
enc_msg.seq_no |= 1;
}
S->seq_no += 2;
};
static void init_enc_msg_inner_temp (struct tgl_dc *DC, long long msg_id) {
enc_msg.auth_key_id = DC->auth_key_id;
tglt_secure_random (&enc_msg.server_salt, 8);
tglt_secure_random (&enc_msg.session_id, 8);
enc_msg.msg_id = msg_id;
enc_msg.seq_no = 0;
};
static int aes_encrypt_message (struct tgl_state *TLS, char *key, struct encrypted_message *enc) {
unsigned char sha1_buffer[20];
const int MINSZ = offsetof (struct encrypted_message, message);
const int UNENCSZ = offsetof (struct encrypted_message, server_salt);
int enc_len = (MINSZ - UNENCSZ) + enc->msg_len;
assert (enc->msg_len >= 0 && enc->msg_len <= MAX_MESSAGE_INTS * 4 - 16 && !(enc->msg_len & 3));
TGLC_sha1 ((unsigned char *) &enc->server_salt, enc_len, sha1_buffer);
vlogprintf (E_DEBUG, "sending message with sha1 %08x\n", *(int *)sha1_buffer);
memcpy (enc->msg_key, sha1_buffer + 4, 16);
tgl_init_aes_auth (key, enc->msg_key, 1);
return tgl_pad_aes_encrypt ((char *) &enc->server_salt, enc_len, (char *) &enc->server_salt, MAX_MESSAGE_INTS * 4 + (MINSZ - UNENCSZ));
}
long long tglmp_encrypt_send_message (struct tgl_state *TLS, struct connection *c, int *msg, int msg_ints, int flags) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
struct tgl_session *S = TLS->net_methods->get_session (c);
assert (S);
if (!(DC->flags & 4) && !(flags & 2)) {
return generate_next_msg_id (TLS, DC, S);
}
const int UNENCSZ = offsetof (struct encrypted_message, server_salt);
if (msg_ints <= 0 || msg_ints > MAX_MESSAGE_INTS - 4) {
return -1;
}
if (msg) {
memcpy (enc_msg.message, msg, msg_ints * 4);
enc_msg.msg_len = msg_ints * 4;
} else {
if ((enc_msg.msg_len & 0x80000003) || enc_msg.msg_len > MAX_MESSAGE_INTS * 4 - 16) {
return -1;
}
}
init_enc_msg (TLS, S, flags & 1);
int l = aes_encrypt_message (TLS, DC->temp_auth_key, &enc_msg);
assert (l > 0);
rpc_send_message (TLS, c, &enc_msg, l + UNENCSZ);
return S->last_msg_id; // Pray that this was set by generate_next_msg_id somehow
}
int tglmp_encrypt_inner_temp (struct tgl_state *TLS, struct connection *c, int *msg, int msg_ints, int useful, void *data, long long msg_id) {
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
struct tgl_session *S = TLS->net_methods->get_session (c);
assert (S);
const int UNENCSZ = offsetof (struct encrypted_message, server_salt);
if (msg_ints <= 0 || msg_ints > MAX_MESSAGE_INTS - 4) {
return -1;
}
memcpy (enc_msg.message, msg, msg_ints * 4);
enc_msg.msg_len = msg_ints * 4;
init_enc_msg_inner_temp (DC, msg_id);
int l = aes_encrypt_message (TLS, DC->auth_key, &enc_msg);
assert (l > 0);
//rpc_send_message (c, &enc_msg, l + UNENCSZ);
memcpy (data, &enc_msg, l + UNENCSZ);
return l + UNENCSZ;
}
static int rpc_execute_answer (struct tgl_state *TLS, struct connection *c, long long msg_id);
static int work_container (struct tgl_state *TLS, struct connection *c, long long msg_id) {
vlogprintf (E_DEBUG, "work_container: msg_id = %" INT64_PRINTF_MODIFIER "d\n", msg_id);
assert (fetch_int () == CODE_msg_container);
int n = fetch_int ();
int i;
for (i = 0; i < n; i++) {
long long id = fetch_long ();
//int seqno = fetch_int ();
fetch_int (); // seq_no
if (id & 1) {
tgln_insert_msg_id (TLS, TLS->net_methods->get_session (c), id);
}
int bytes = fetch_int ();
int *t = in_end;
in_end = in_ptr + (bytes / 4);
int r = rpc_execute_answer (TLS, c, id);
if (r < 0) { return -1; }
assert (in_ptr == in_end);
in_end = t;
}
return 0;
}
static int work_new_session_created (struct tgl_state *TLS, struct connection *c, long long msg_id) {
struct tgl_session *S = TLS->net_methods->get_session (c);
struct tgl_dc *DC = TLS->net_methods->get_dc (c);
vlogprintf (E_NOTICE, "work_new_session_created: msg_id = %" INT64_PRINTF_MODIFIER "d, dc = %d\n", msg_id, DC->id);
assert (fetch_int () == (int)CODE_new_session_created);
fetch_long (); // first message id
fetch_long (); // unique_id
TLS->net_methods->get_dc (c)->server_salt = fetch_long ();
tglq_regen_queries_from_old_session (TLS, DC, S);
if (TLS->started && !(TLS->locks & TGL_LOCK_DIFF) && (TLS->DC_working->flags & TGLDCF_LOGGED_IN)) {
tgl_do_get_difference (TLS, 0, 0, 0);
}
return 0;
}
static int work_msgs_ack (struct tgl_state *TLS, struct connection *c, long long msg_id) {
vlogprintf (E_DEBUG, "work_msgs_ack: msg_id = %" INT64_PRINTF_MODIFIER "d\n", msg_id);
assert (fetch_int () == CODE_msgs_ack);
assert (fetch_int () == CODE_vector);
int n = fetch_int ();
int i;
for (i = 0; i < n; i++) {
long long id = fetch_long ();
vlogprintf (E_DEBUG + 1, "ack for %" INT64_PRINTF_MODIFIER "d\n", id);
tglq_query_ack (TLS, id);
}
return 0;
}
static int work_rpc_result (struct tgl_state *TLS, struct connection *c, long long msg_id) {
vlogprintf (E_DEBUG, "work_rpc_result: msg_id = %" INT64_PRINTF_MODIFIER "d\n", msg_id);
assert (fetch_int () == (int)CODE_rpc_result);
long long id = fetch_long ();
int op = prefetch_int ();
if (op == CODE_rpc_error) {
return tglq_query_error (TLS, id);
} else {
return tglq_query_result (TLS, id);
}
}
#define MAX_PACKED_SIZE (1 << 24)
static int work_packed (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == CODE_gzip_packed);
static int in_gzip;
static int buf[MAX_PACKED_SIZE >> 2];
assert (!in_gzip);
in_gzip = 1;
int l = prefetch_strlen ();
char *s = fetch_str (l);
int total_out = tgl_inflate (s, l, buf, MAX_PACKED_SIZE);
int *end = in_ptr;
int *eend = in_end;
//assert (total_out % 4 == 0);
in_ptr = buf;
in_end = in_ptr + total_out / 4;
int r = rpc_execute_answer (TLS, c, msg_id);
in_ptr = end;
in_end = eend;
in_gzip = 0;
return r;
}
static int work_bad_server_salt (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == (int)CODE_bad_server_salt);
long long id = fetch_long ();
fetch_int (); // seq_no
fetch_int (); // error_code
long long new_server_salt = fetch_long ();
TLS->net_methods->get_dc (c)->server_salt = new_server_salt;
tglq_query_restart (TLS, id);
return 0;
}
static int work_pong (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == CODE_pong);
fetch_long (); // msg_id
fetch_long (); // ping_id
return 0;
}
static int work_detailed_info (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == CODE_msg_detailed_info);
fetch_long (); // msg_id
fetch_long (); // answer_msg_id
fetch_int (); // bytes
fetch_int (); // status
return 0;
}
static int work_new_detailed_info (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == (int)CODE_msg_new_detailed_info);
fetch_long (); // answer_msg_id
fetch_int (); // bytes
fetch_int (); // status
return 0;
}
static int work_bad_msg_notification (struct tgl_state *TLS, struct connection *c, long long msg_id) {
assert (fetch_int () == (int)CODE_bad_msg_notification);
long long m1 = fetch_long ();
int s = fetch_int ();
int e = fetch_int ();
vlogprintf (E_NOTICE, "bad_msg_notification: msg_id = %" INT64_PRINTF_MODIFIER "d, seq = %d, error = %d\n", m1, s, e);
switch (e) {
// Too low msg id
case 16:
tglq_regen_query (TLS, m1);
break;
// Too high msg id
case 17:
tglq_regen_query (TLS, m1);
break;
// Bad container
case 64:
vlogprintf (E_NOTICE, "bad_msg_notification: msg_id = %" INT64_PRINTF_MODIFIER "d, seq = %d, error = %d\n", m1, s, e);
tglq_regen_query (TLS, m1);
break;
default:
vlogprintf (E_NOTICE, "bad_msg_notification: msg_id = %" INT64_PRINTF_MODIFIER "d, seq = %d, error = %d\n", m1, s, e);
break;
}
return -1;
}
static int rpc_execute_answer (struct tgl_state *TLS, struct connection *c, long long msg_id) {
int op = prefetch_int ();
switch (op) {
case CODE_msg_container:
return work_container (TLS, c, msg_id);
case CODE_new_session_created:
return work_new_session_created (TLS, c, msg_id);
case CODE_msgs_ack:
return work_msgs_ack (TLS, c, msg_id);
case CODE_rpc_result:
return work_rpc_result (TLS, c, msg_id);
case CODE_update_short:
case CODE_updates:
case CODE_update_short_message:
case CODE_update_short_chat_message:
case CODE_updates_too_long:
tglu_work_any_updates_buf (TLS);
return 0;
case CODE_gzip_packed:
return work_packed (TLS, c, msg_id);
case CODE_bad_server_salt:
return work_bad_server_salt (TLS, c, msg_id);
case CODE_pong:
return work_pong (TLS, c, msg_id);
case CODE_msg_detailed_info:
return work_detailed_info (TLS, c, msg_id);
case CODE_msg_new_detailed_info:
return work_new_detailed_info (TLS, c, msg_id);
case CODE_bad_msg_notification:
return work_bad_msg_notification (TLS, c, msg_id);
}
vlogprintf (E_WARNING, "Unknown message: %08x\n", op);
in_ptr = in_end; // Will not fail due to assertion in_ptr == in_end
return 0;
}
static struct mtproto_methods mtproto_methods;
void tgls_free_session (struct tgl_state *TLS, struct tgl_session *S);
/*
static char *get_ipv6 (struct tgl_state *TLS, int num) {
static char res[1<< 10];
if (TLS->test_mode) {
switch (num) {
case 1:
strcpy (res, TG_SERVER_TEST_IPV6_1);
break;
case 2:
strcpy (res, TG_SERVER_TEST_IPV6_2);
break;
case 3:
strcpy (res, TG_SERVER_TEST_IPV6_3);
break;
default:
assert (0);
}
} else {
switch (num) {
case 1:
strcpy (res, TG_SERVER_IPV6_1);
break;
case 2:
strcpy (res, TG_SERVER_IPV6_2);