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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 2013-2014
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _FILE_OFFSET_BITS 64
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#include <sys/endian.h>
#endif
#include <sys/types.h>
#include <netdb.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/sha.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
//#include "telegram.h"
#include "include.h"
#include "queries.h"
//#include "loop.h"
#include "structures.h"
#include "binlog.h"
#include "auto.h"
#include "tgl.h"
#include "mtproto-client.h"
#include "tools.h"
#include "tree.h"
#include "updates.h"
#if defined(__FreeBSD__)
#define __builtin_bswap32(x) bswap32(x)
#endif
#if defined(__OpenBSD__)
#define __builtin_bswap32(x) __swap32gen(x)
#endif
#define sha1 SHA1
#include "mtproto-common.h"
#define MAX_NET_RES (1L << 16)
//extern int log_level;
#if !defined(HAVE___BUILTIN_BSWAP32) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
static inline unsigned __builtin_bswap32(unsigned x) {
return ((x << 24) & 0xff000000 ) |
((x << 8) & 0x00ff0000 ) |
((x >> 8) & 0x0000ff00 ) |
((x >> 24) & 0x000000ff );
}
#endif
//int verbosity;
//static enum tgl_dc_state c_state;
//extern int binlog_enabled;
//extern int disable_auto_accept;
//extern int allow_weak_random;
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 long long precise_time;
static double get_utime (int clock_id) {
struct timespec T;
tgl_my_clock_gettime (clock_id, &T);
double res = T.tv_sec + (double) T.tv_nsec * 1e-9;
if (clock_id == CLOCK_REALTIME) {
precise_time = (long long) (res * (1LL << 32));
}
return res;
}
//#define STATS_BUFF_SIZE (64 << 10)
//static int stats_buff_len;
//static char stats_buff[STATS_BUFF_SIZE];
#define MAX_RESPONSE_SIZE (1L << 24)
//static int Response_len;
/*
*
* STATE MACHINE
*
*/
#define TG_SERVER_PUBKEY_FILENAME "tg-server.pub"
//static char *rsa_public_key_name; // = TG_SERVER_PUBKEY_FILENAME;
//static RSA *pubKey;
static long long pk_fingerprint;
static int rsa_load_public_key (struct tgl_state *TLS, const char *public_key_name) {
TLS->pubKey = NULL;
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 -1;
}
TLS->pubKey = PEM_read_RSAPublicKey (f, NULL, NULL, NULL);
fclose (f);
if (TLS->pubKey == NULL) {
vlogprintf (E_WARNING, "PEM_read_RSAPublicKey returns NULL.\n");
return -1;
}
vlogprintf (E_WARNING, "public key '%s' loaded successfully\n", public_key_name);
return 0;
}
/*
*
* UNAUTHORIZED (DH KEY EXCHANGE) PROTOCOL PART
*
*/
static BIGNUM dh_prime, dh_g, g_a, auth_key_num;
static char s_power [256];
static struct {
long long auth_key_id;
long long out_msg_id;
int msg_len;
} unenc_msg_header;
#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) {
return tgl_pad_rsa_encrypt (TLS, (char *) packet_buffer, (packet_ptr - packet_buffer) * 4, (char *) encrypt_buffer, ENCRYPT_BUFFER_INTS * 4, ((RSA *)TLS->pubKey)->n, ((RSA *)TLS->pubKey)->e);
}
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, AES_ENCRYPT);
return tgl_pad_aes_encrypt ((char *) packet_buffer, (packet_ptr - packet_buffer) * 4, (char *) encrypt_buffer, ENCRYPT_BUFFER_INTS * 4);
}
static int rpc_send_packet (struct tgl_state *TLS, struct connection *c) {
int len = (packet_ptr - packet_buffer) * 4;
//c->out_packet_num ++;
TLS->net_methods->incr_out_packet_num (c);
long long next_msg_id = (long long) ((1LL << 32) * get_utime (CLOCK_REALTIME)) & -4;
if (next_msg_id <= unenc_msg_header.out_msg_id) {
unenc_msg_header.out_msg_id += 4;
} else {
unenc_msg_header.out_msg_id = next_msg_id;
}
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;
}
static int send_req_pq_packet (struct tgl_state *TLS, struct connection *c) {
struct tgl_dc *D = TLS->net_methods->get_dc (c);
assert (D->state == st_init);
tglt_secure_random (D->nonce, 16);
unenc_msg_header.out_msg_id = 0;
clear_packet ();
out_int (CODE_req_pq);
out_ints ((int *)D->nonce, 4);
rpc_send_packet (TLS, c);
D->state = st_reqpq_sent;
return 1;
}
static int send_req_pq_temp_packet (struct tgl_state *TLS, struct connection *c) {
struct tgl_dc *D = TLS->net_methods->get_dc (c);
assert (D->state == st_authorized);
tglt_secure_random (D->nonce, 16);
unenc_msg_header.out_msg_id = 0;
clear_packet ();
out_int (CODE_req_pq);
out_ints ((int *)D->nonce, 4);
rpc_send_packet (TLS, c);
D->state = st_reqpq_sent_temp;
return 1;
}
static unsigned long long gcd (unsigned long long a, unsigned long long b) {
return b ? gcd (b, a % b) : a;
}
//typedef unsigned int uint128_t __attribute__ ((mode(TI)));
static int process_respq_answer (struct tgl_state *TLS, struct connection *c, char *packet, int len, int temp_key) {
struct tgl_dc *D = TLS->net_methods->get_dc (c);
unsigned long long what;
unsigned p1, p2;
int i;
long long packet_auth_key_id = *(long long *)packet;
if (packet_auth_key_id) {
assert (temp_key);
vlogprintf (E_WARNING, "received packet during creation of temp auth key. Probably answer on old query. Drop\n");
return 0;
}
vlogprintf (E_DEBUG, "process_respq_answer(), len=%d, op=0x%08x\n", len, *(int *)(packet + 20));
assert (len >= 76);
assert (!*(long long *) packet);
assert (*(int *) (packet + 16) == len - 20);
assert (!(len & 3));
assert (*(int *) (packet + 20) == CODE_resPQ);
assert (!memcmp (packet + 24, D->nonce, 16));
memcpy (D->server_nonce, packet + 40, 16);
char *from = packet + 56;
int clen = *from++;
assert (clen <= 8);
what = 0;
for (i = 0; i < clen; i++) {
what = (what << 8) + (unsigned char)*from++;
}
while (((unsigned long)from) & 3) ++from;
p1 = 0, p2 = 0;
int it = 0;
unsigned long long g = 0;
for (i = 0; i < 3 || it < 1000; i++) {
int q = ((lrand48() & 15) + 17) % what;
unsigned long long x = (long long)lrand48 () % (what - 1) + 1, y = x;
int lim = 1 << (i + 18);
int j;
for (j = 1; j < lim; j++) {
++it;
unsigned long long a = x, b = x, c = q;
while (b) {
if (b & 1) {
c += a;
if (c >= what) {
c -= what;
}
}
a += a;
if (a >= what) {
a -= what;
}
b >>= 1;
}
x = c;
unsigned long long z = x < y ? what + x - y : x - y;
g = gcd (z, what);
if (g != 1) {
break;
}
if (!(j & (j - 1))) {
y = x;
}
}
if (g > 1 && g < what) break;
}
assert (g > 1 && g < what);
p1 = g;
p2 = what / g;
if (p1 > p2) {
unsigned t = p1; p1 = p2; p2 = t;
}
/// ++p1; ///
assert (*(int *) (from) == CODE_vector);
int fingerprints_num = *(int *)(from + 4);
assert (fingerprints_num >= 1 && fingerprints_num <= 64 && len == fingerprints_num * 8 + 8 + (from - packet));
long long *fingerprints = (long long *) (from + 8);
for (i = 0; i < fingerprints_num; i++) {
if (fingerprints[i] == pk_fingerprint) {
//logprintf ( "found our public key at position %d\n", i);
break;
}
}
if (i == fingerprints_num) {
vlogprintf (E_ERROR, "fatal: don't have any matching keys (%016llx expected)\n", pk_fingerprint);
exit (2);
}
// create inner part (P_Q_inner_data)
clear_packet ();
packet_ptr += 5;
out_int (temp_key ? CODE_p_q_inner_data_temp : CODE_p_q_inner_data);
out_cstring (packet + 57, clen);
//out_int (0x0f01); // pq=15
if (p1 < 256) {
clen = 1;
} else if (p1 < 65536) {
clen = 2;
} else if (p1 < 16777216) {
clen = 3;
} else {
clen = 4;
}
p1 = __builtin_bswap32 (p1);
out_cstring ((char *)&p1 + 4 - clen, clen);
p1 = __builtin_bswap32 (p1);
if (p2 < 256) {
clen = 1;
} else if (p2 < 65536) {
clen = 2;
} else if (p2 < 16777216) {
clen = 3;
} else {
clen = 4;
}
p2 = __builtin_bswap32 (p2);
out_cstring ((char *)&p2 + 4 - clen, clen);
p2 = __builtin_bswap32 (p2);
//out_int (0x0301); // p=3
//out_int (0x0501); // q=5
out_ints ((int *) D->nonce, 4);
out_ints ((int *) D->server_nonce, 4);
tglt_secure_random (D->new_nonce, 32);
out_ints ((int *) D->new_nonce, 8);
if (temp_key) {
out_int (TLS->temp_key_expire_time);
}
sha1 ((unsigned char *) (packet_buffer + 5), (packet_ptr - packet_buffer - 5) * 4, (unsigned char *) packet_buffer);
int l = encrypt_packet_buffer (TLS);
clear_packet ();
out_int (CODE_req_DH_params);
out_ints ((int *) D->nonce, 4);
out_ints ((int *) D->server_nonce, 4);
//out_int (0x0301); // p=3
//out_int (0x0501); // q=5
if (p1 < 256) {
clen = 1;
} else if (p1 < 65536) {
clen = 2;
} else if (p1 < 16777216) {
clen = 3;
} else {
clen = 4;
}
p1 = __builtin_bswap32 (p1);
out_cstring ((char *)&p1 + 4 - clen, clen);
p1 = __builtin_bswap32 (p1);
if (p2 < 256) {
clen = 1;
} else if (p2 < 65536) {
clen = 2;
} else if (p2 < 16777216) {
clen = 3;
} else {
clen = 4;
}
p2 = __builtin_bswap32 (p2);
out_cstring ((char *)&p2 + 4 - clen, clen);
p2 = __builtin_bswap32 (p2);
out_long (pk_fingerprint);
out_cstring ((char *) encrypt_buffer, l);
D->state = temp_key ? st_reqdh_sent_temp : st_reqdh_sent;
return rpc_send_packet (TLS, c);
}
static int check_prime (struct tgl_state *TLS, BIGNUM *p) {
int r = BN_is_prime (p, BN_prime_checks, 0, TLS->BN_ctx, 0);
ensure (r >= 0);
return r;
}
int tglmp_check_DH_params (struct tgl_state *TLS, BIGNUM *p, int g) {
if (g < 2 || g > 7) { return -1; }
if (BN_num_bits (p) != 2048) { return -1; }
BIGNUM t;
BN_init (&t);
BN_init (&dh_g);
ensure (BN_set_word (&dh_g, 4 * g));
ensure (BN_mod (&t, p, &dh_g, TLS->BN_ctx));
int x = BN_get_word (&t);
assert (x >= 0 && x < 4 * g);
BN_free (&dh_g);
switch (g) {
case 2:
if (x != 7) { return -1; }
break;
case 3:
if (x % 3 != 2 ) { return -1; }
break;
case 4:
break;
case 5:
if (x % 5 != 1 && x % 5 != 4) { return -1; }
break;
case 6:
if (x != 19 && x != 23) { return -1; }
break;
case 7:
if (x % 7 != 3 && x % 7 != 5 && x % 7 != 6) { return -1; }
break;
}
if (!check_prime (TLS, p)) { return -1; }
BIGNUM b;
BN_init (&b);
ensure (BN_set_word (&b, 2));
ensure (BN_div (&t, 0, p, &b, TLS->BN_ctx));
if (!check_prime (TLS, &t)) { return -1; }
BN_free (&b);
BN_free (&t);
return 0;
}
int tglmp_check_g (struct tgl_state *TLS, unsigned char p[256], BIGNUM *g) {
static unsigned char s[256];
memset (s, 0, 256);
assert (BN_num_bytes (g) <= 256);
BN_bn2bin (g, s + (256 - BN_num_bytes (g)));
int ok = 0;
int i;
for (i = 0; i < 64; i++) {
if (s[i]) {
ok = 1;
break;
}
}
if (!ok) { return -1; }
ok = 0;
for (i = 0; i < 64; i++) {
if (s[255 - i]) {
ok = 1;
break;
}
}
if (!ok) { return -1; }
ok = 0;
for (i = 0; i < 64; i++) {
if (s[i] < p[i]) {
ok = 1;
break;
} else if (s[i] > p[i]) {
vlogprintf (E_WARNING, "i = %d (%d %d)\n", i, (int)s[i], (int)p[i]);
return -1;
}
}
if (!ok) { return -1; }
return 0;
}
int tglmp_check_g_bn (struct tgl_state *TLS, BIGNUM *p, BIGNUM *g) {
static unsigned char s[256];
memset (s, 0, 256);
assert (BN_num_bytes (p) == 256);
BN_bn2bin (p, s);
return tglmp_check_g (TLS, s, g);
}
static int process_dh_answer (struct tgl_state *TLS, struct connection *c, char *packet, int len, int temp_key) {
struct tgl_dc *D = TLS->net_methods->get_dc (c);
vlogprintf (E_DEBUG, "process_dh_answer(), len=%d\n", len);
//if (len < 116) {
// vlogprintf (E_ERROR, "%u * %u = %llu", p1, p2, what);
//}
long long packet_auth_key_id = *(long long *)packet;
if (packet_auth_key_id) {
assert (temp_key);
vlogprintf (E_WARNING, "received packet during creation of temp auth key. Probably answer on old query. Drop\n");
return 0;
}
assert (len >= 116);
assert (!*(long long *) packet);
assert (*(int *) (packet + 16) == len - 20);
assert (!(len & 3));
assert (*(int *) (packet + 20) == (int)CODE_server_DH_params_ok);
assert (!memcmp (packet + 24, D->nonce, 16));
assert (!memcmp (packet + 40, D->server_nonce, 16));
tgl_init_aes_unauth (D->server_nonce, D->new_nonce, AES_DECRYPT);
in_ptr = (int *)(packet + 56);
in_end = (int *)(packet + len);
int l = prefetch_strlen ();
assert (l > 0);
l = tgl_pad_aes_decrypt (fetch_str (l), l, (char *) decrypt_buffer, DECRYPT_BUFFER_INTS * 4 - 16);
assert (in_ptr == in_end);
assert (l >= 60);
assert (decrypt_buffer[5] == (int)CODE_server_DH_inner_data);
assert (!memcmp (decrypt_buffer + 6, D->nonce, 16));
assert (!memcmp (decrypt_buffer + 10, D->server_nonce, 16));
int g = decrypt_buffer[14];
in_ptr = decrypt_buffer + 15;
in_end = decrypt_buffer + (l >> 2);
BN_init (&dh_prime);
BN_init (&g_a);
assert (fetch_bignum (&dh_prime) > 0);
assert (fetch_bignum (&g_a) > 0);
assert (tglmp_check_g_bn (TLS, &dh_prime, &g_a) >= 0);
int server_time = *in_ptr++;
assert (in_ptr <= in_end);
assert (tglmp_check_DH_params (TLS, &dh_prime, g) >= 0);
static char sha1_buffer[20];
sha1 ((unsigned char *) decrypt_buffer + 20, (in_ptr - decrypt_buffer - 5) * 4, (unsigned char *) sha1_buffer);
assert (!memcmp (decrypt_buffer, sha1_buffer, 20));
assert ((char *) in_end - (char *) in_ptr < 16);
D->server_time_delta = server_time - time (0);
D->server_time_udelta = server_time - get_utime (CLOCK_MONOTONIC);
//logprintf ( "server time is %d, delta = %d\n", server_time, server_time_delta);
// Build set_client_DH_params answer
clear_packet ();
packet_ptr += 5;
out_int (CODE_client_DH_inner_data);
out_ints ((int *) D->nonce, 4);
out_ints ((int *) D->server_nonce, 4);
out_long (0LL);
BN_init (&dh_g);
ensure (BN_set_word (&dh_g, g));
tglt_secure_random (s_power, 256);
BIGNUM *dh_power = BN_bin2bn ((unsigned char *)s_power, 256, 0);
ensure_ptr (dh_power);
BIGNUM *y = BN_new ();
ensure_ptr (y);
ensure (BN_mod_exp (y, &dh_g, dh_power, &dh_prime, TLS->BN_ctx));
out_bignum (y);
BN_free (y);
BN_init (&auth_key_num);
ensure (BN_mod_exp (&auth_key_num, &g_a, dh_power, &dh_prime, TLS->BN_ctx));
l = BN_num_bytes (&auth_key_num);
assert (l >= 250 && l <= 256);
assert (BN_bn2bin (&auth_key_num, (unsigned char *)(temp_key ? D->temp_auth_key : D->auth_key)));
if (l < 256) {
char *key = temp_key ? D->temp_auth_key : D->auth_key;
memmove (key + 256 - l, key, l);
memset (key, 0, 256 - l);
}
BN_free (dh_power);
BN_free (&auth_key_num);
BN_free (&dh_g);
BN_free (&g_a);
BN_free (&dh_prime);
//hexdump (auth_key, auth_key + 256);
sha1 ((unsigned char *) (packet_buffer + 5), (packet_ptr - packet_buffer - 5) * 4, (unsigned char *) packet_buffer);
//hexdump ((char *)packet_buffer, (char *)packet_ptr);
l = encrypt_packet_buffer_aes_unauth (D->server_nonce, D->new_nonce);
clear_packet ();
out_int (CODE_set_client_DH_params);
out_ints ((int *) D->nonce, 4);
out_ints ((int *) D->server_nonce, 4);
out_cstring ((char *) encrypt_buffer, l);
D->state = temp_key ? st_client_dh_sent_temp : st_client_dh_sent;;
return rpc_send_packet (TLS, c);
}
static void create_temp_auth_key (struct tgl_state *TLS, struct connection *c) {
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 generate_next_msg_id (struct tgl_state *TLS, struct tgl_dc *DC);
static long long msg_id_override;
static void mpc_on_get_config (struct tgl_state *TLS, void *extra, int success);
static int process_auth_complete (struct tgl_state *TLS, struct connection *c UU, char *packet, int len, int temp_key) {
struct tgl_dc *D = TLS->net_methods->get_dc (c);
vlogprintf (E_DEBUG - 1, "process_dh_answer(), len=%d\n", len);
long long packet_auth_key_id = *(long long *)packet;
if (packet_auth_key_id) {
assert (temp_key);
vlogprintf (E_WARNING, "received packet during creation of temp auth key. Probably answer on old query. Drop\n");
return 0;
}
assert (len == 72);
assert (!*(long long *) packet);
assert (*(int *) (packet + 16) == len - 20);
assert (!(len & 3));
assert (*(int *) (packet + 20) == CODE_dh_gen_ok);
assert (!memcmp (packet + 24, D->nonce, 16));
assert (!memcmp (packet + 40, D->server_nonce, 16));
static unsigned char tmp[44], sha1_buffer[20];
memcpy (tmp, D->new_nonce, 32);
tmp[32] = 1;
//GET_DC(c)->auth_key_id = *(long long *)(sha1_buffer + 12);
if (!temp_key) {
bl_do_set_auth_key_id (TLS, D->id, (unsigned char *)D->auth_key);
sha1 ((unsigned char *)D->auth_key, 256, sha1_buffer);
} else {
sha1 ((unsigned char *)D->temp_auth_key, 256, sha1_buffer);
D->temp_auth_key_id = *(long long *)(sha1_buffer + 12);
}
memcpy (tmp + 33, sha1_buffer, 8);
sha1 (tmp, 41, sha1_buffer);
assert (!memcmp (packet + 56, sha1_buffer + 4, 16));
D->server_salt = *(long long *)D->server_nonce ^ *(long long *)D->new_nonce;
//kprintf ("OK\n");
//c->status = conn_error;
//sleep (1);
D->state = st_authorized;
//return 1;
vlogprintf (E_DEBUG, "Auth success\n");
if (temp_key) {
//D->flags |= 2;
long long msg_id = generate_next_msg_id (TLS, D);
clear_packet ();
out_int (CODE_bind_auth_key_inner);
long long rand;
tglt_secure_random (&rand, 8);
out_long (rand);
out_long (D->temp_auth_key_id);
out_long (D->auth_key_id);
struct tgl_session *S = TLS->net_methods->get_session (c);
if (!S->session_id) {
tglt_secure_random (&S->session_id, 8);
}
out_long (S->session_id);
int expires = time (0) + D->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;
tgl_do_send_bind_temp_key (TLS, D, rand, expires, (void *)data, len, msg_id);
msg_id_override = 0;
} else {
D->flags |= 1;
if (TLS->enable_pfs) {
create_temp_auth_key (TLS, c);
} else {
D->temp_auth_key_id = D->auth_key_id;
memcpy (D->temp_auth_key, D->auth_key, 256);
D->flags |= 2;
if (!(D->flags & 4)) {
tgl_do_help_get_config_dc (TLS, D, mpc_on_get_config, D);
}
}
}
//write_auth_file ();
return 1;
}
/*
*
* AUTHORIZED (MAIN) PROTOCOL PART
*
*/
static struct encrypted_message enc_msg;
static long long client_last_msg_id, server_last_msg_id;
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) {
long long next_id = (long long) (get_server_time (DC) * (1LL << 32)) & -4;
if (next_id <= client_last_msg_id) {
next_id = client_last_msg_id += 4;
} else {
client_last_msg_id = next_id;
}
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->flags & 2);
assert (DC->temp_auth_key_id);
vlogprintf (E_DEBUG, "temp_auth_key_id = 0x%016llx, auth_key_id = 0x%016llx\n", DC->temp_auth_key_id, DC->auth_key_id);
enc_msg.auth_key_id = DC->temp_auth_key_id;
// assert (DC->server_salt);
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.auth_key_id2 = auth_key_id;
enc_msg.msg_id = msg_id_override ? msg_id_override : generate_next_msg_id (TLS, DC);
//enc_msg.msg_id -= 0x10000000LL * (lrand48 () & 15);
//kprintf ("message id %016llx\n", enc_msg.msg_id);
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));
sha1 ((unsigned char *) &enc->server_salt, enc_len, sha1_buffer);
//printf ("enc_len is %d\n", enc_len);
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, AES_ENCRYPT);
//hexdump ((char *)enc, (char *)enc + enc_len + 24);
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);
if (!(DC->flags & 4) && !(flags & 2)) {
return generate_next_msg_id (TLS, DC);
}
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;
}
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);
//hexdump ((char *)msg, (char *)msg + (msg_ints * 4));
int l = aes_encrypt_message (TLS, DC->temp_auth_key, &enc_msg);
//hexdump ((char *)&enc_msg, (char *)&enc_msg + l + 24);
assert (l > 0);
vlogprintf (E_DEBUG, "Sending message to DC%d: %s:%d with key_id=%lld\n", DC->id, DC->ip, DC->port, enc_msg.auth_key_id);
rpc_send_message (TLS, c, &enc_msg, l + UNENCSZ);
return client_last_msg_id;
}
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 good_messages;
static void rpc_execute_answer (struct tgl_state *TLS, struct connection *c, long long msg_id UU);
//int unread_messages;
//int pts;
//int qts;
//int last_date;
//int seq;
static void work_container (struct tgl_state *TLS, struct connection *c, long long msg_id UU) {
vlogprintf (E_DEBUG, "work_container: msg_id = %lld\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);
rpc_execute_answer (TLS, c, id);
assert (in_ptr == in_end);
in_end = t;
}
}
static void work_new_session_created (struct tgl_state *TLS, struct connection *c, long long msg_id UU) {
vlogprintf (E_DEBUG, "work_new_session_created: msg_id = %lld\n", msg_id);
assert (fetch_int () == (int)CODE_new_session_created);
fetch_long (); // first message id
//DC->session_id = fetch_long ();
fetch_long (); // unique_id
TLS->net_methods->get_dc (c)->server_salt = fetch_long ();
if (TLS->started && !(TLS->locks & TGL_LOCK_DIFF)) {
tgl_do_get_difference (TLS, 0, 0, 0);
}
}
static void work_msgs_ack (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
vlogprintf (E_DEBUG, "work_msgs_ack: msg_id = %lld\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 %lld\n", id);
tglq_query_ack (TLS, id);
}
}
static void work_rpc_result (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
vlogprintf (E_DEBUG, "work_rpc_result: msg_id = %lld\n", msg_id);
assert (fetch_int () == (int)CODE_rpc_result);
long long id = fetch_long ();
int op = prefetch_int ();
if (op == CODE_rpc_error) {
tglq_query_error (TLS, id);
} else {
tglq_query_result (TLS, id);
}
}
#define MAX_PACKED_SIZE (1 << 24)
static void 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;
rpc_execute_answer (TLS, c, msg_id);
in_ptr = end;
in_end = eend;
in_gzip = 0;
}
static void work_bad_server_salt (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
assert (fetch_int () == (int)CODE_bad_server_salt);
long long id = fetch_long ();
tglq_query_restart (TLS, id);
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;
}
static void work_pong (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
assert (fetch_int () == CODE_pong);
fetch_long (); // msg_id
fetch_long (); // ping_id
}
static void work_detailed_info (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
assert (fetch_int () == CODE_msg_detailed_info);
fetch_long (); // msg_id
fetch_long (); // answer_msg_id
fetch_int (); // bytes
fetch_int (); // status
}
static void work_new_detailed_info (struct tgl_state *TLS, struct connection *c UU, long long msg_id UU) {
assert (fetch_int () == (int)CODE_msg_new_detailed_info);
fetch_long (); // answer_msg_id
fetch_int (); // bytes