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Code Issues Projects Releases Wiki Activity

First part of DHT hardening done.

Browse Source 
Added crypto to the DHT communications.

This defeats completely the first attack mentioned in
docs/DHT_hardening.

Also updated the build system to build the latest test (it links it with
libsodium)
This commit is contained in:
irungentoo 2013-07-12 16:27:19 -04:00
parent e830861a9d
commit 79aa715514
12 changed files with 302 additions and 135 deletions
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1
.gitignore vendored
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@ -1,5 +1,4 @@
.DS_Store
.travis.yml
//nacl build
nacl/build/

9
.travis.yml
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@ -2,6 +2,15 @@ language: c
compiler:
- gcc
before_script:
- git clone git://github.com/jedisct1/libsodium.git
- cd libsodium
- ./autogen.sh
- ./configure && make check
- sudo make install
- sudo ldconfig
- cd ..
script:
- cmake CMakeLists.txt
- make -j3

13
CMakeLists.txt
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@ -2,14 +2,19 @@ cmake_minimum_required(VERSION 2.6.0)
project(TOX C)
set(core_sources
#core/DHT.c
core/network.c)
core/DHT.c
core/network.c
core/Lossless_UDP.c
core/net_crypto.c
core/Messenger.c)
set(test_sources
testing/DHT_test.c)
testing/Messenger_test.c)
set(exe_name TOX-app)
target_link_libraries(sodium)
add_executable(${exe_name}
${core_sources}
${test_sources})

281
core/DHT.c
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@ -54,36 +54,36 @@ typedef struct
typedef struct
{
IP_Port ip_port;
uint32_t ping_id;
uint64_t ping_id;
uint32_t timestamp;
}Pinged;
uint8_t self_client_id[CLIENT_ID_SIZE];
//Our client id/public key
uint8_t self_public_key[CLIENT_ID_SIZE];
uint8_t self_secret_key[crypto_box_SECRETKEYBYTES];
//TODO: Move these out of here and put them into the .c file.
//A list of the clients mathematically closest to ours.
#define LCLIENT_LIST 32
Client_data close_clientlist[LCLIENT_LIST];
static Client_data close_clientlist[LCLIENT_LIST];
//Hard maximum number of friends
#define MAX_FRIENDS 256
//Let's start with a static array for testing.
Friend friends_list[MAX_FRIENDS];
uint16_t num_friends;
static Friend friends_list[MAX_FRIENDS];
static uint16_t num_friends;
//The list of ip ports along with the ping_id of what we sent them and a timestamp
#define LPING_ARRAY 128
Pinged pings[LPING_ARRAY];
static Pinged pings[LPING_ARRAY];
#define LSEND_NODES_ARRAY LPING_ARRAY/2
Pinged send_nodes[LSEND_NODES_ARRAY];
static Pinged send_nodes[LSEND_NODES_ARRAY];
//Compares client_id1 and client_id2 with client_id
@ -298,7 +298,7 @@ void addto_lists(IP_Port ip_port, uint8_t * client_id)
if(replace_bad(close_clientlist, LCLIENT_LIST, client_id, ip_port))
{
//if we can't replace bad nodes we try replacing good ones
replace_good(close_clientlist, LCLIENT_LIST, client_id, ip_port, self_client_id);
replace_good(close_clientlist, LCLIENT_LIST, client_id, ip_port, self_public_key);
}
}
@ -310,7 +310,7 @@ void addto_lists(IP_Port ip_port, uint8_t * client_id)
if(replace_bad(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port))
{
//if we can't replace bad nodes we try replacing good ones
replace_good(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port, self_client_id);
replace_good(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port, self_public_key);
}
}
}
@ -324,7 +324,7 @@ void addto_lists(IP_Port ip_port, uint8_t * client_id)
//if we are already, return 1
//else return 0
//TODO: Maybe optimize this
int is_pinging(IP_Port ip_port, uint32_t ping_id)
int is_pinging(IP_Port ip_port, uint64_t ping_id)
{
uint32_t i;
uint8_t pinging;
@ -364,7 +364,7 @@ int is_pinging(IP_Port ip_port, uint32_t ping_id)
//Same as last function but for get_node requests.
int is_gettingnodes(IP_Port ip_port, uint32_t ping_id)
int is_gettingnodes(IP_Port ip_port, uint64_t ping_id)
{
uint32_t i;
uint8_t pinging;
@ -407,10 +407,10 @@ int is_gettingnodes(IP_Port ip_port, uint32_t ping_id)
//returns the ping_id to put in the ping request
//returns 0 if problem.
//TODO: Maybe optimize this
int add_pinging(IP_Port ip_port)
uint64_t add_pinging(IP_Port ip_port)
{
uint32_t i, j;
int ping_id = rand();
uint64_t ping_id = ((uint64_t)random_int() << 32) + random_int();
uint32_t temp_time = unix_time();
for(i = 0; i < PING_TIMEOUT; i++ )
@ -431,10 +431,10 @@ int add_pinging(IP_Port ip_port)
}
//Same but for get node requests
int add_gettingnodes(IP_Port ip_port)
uint64_t add_gettingnodes(IP_Port ip_port)
{
uint32_t i, j;
int ping_id = rand();
uint64_t ping_id = ((uint64_t)random_int() << 32) + random_int();
uint32_t temp_time = unix_time();
for(i = 0; i < PING_TIMEOUT; i++ )
@ -458,23 +458,38 @@ int add_gettingnodes(IP_Port ip_port)
//send a ping request
//Ping request only works if none has been sent to that ip/port in the last 5 seconds.
int pingreq(IP_Port ip_port)
static int pingreq(IP_Port ip_port, uint8_t * public_key)
{
if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is gonna be sent to ourself
{
return 1;
}
if(is_pinging(ip_port, 0))
{
return 1;
}
int ping_id = add_pinging(ip_port);
uint64_t ping_id = add_pinging(ip_port);
if(ping_id == 0)
{
return 1;
}
uint8_t data[5 + CLIENT_ID_SIZE];
uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING];
uint8_t encrypt[sizeof(ping_id) + ENCRYPTION_PADDING];
uint8_t nonce[crypto_box_NONCEBYTES];
random_nonce(nonce);
int len = encrypt_data(public_key, self_secret_key, nonce, (uint8_t *)&ping_id, sizeof(ping_id), encrypt);
if(len != sizeof(ping_id) + ENCRYPTION_PADDING)
{
return -1;
}
data[0] = 0;
memcpy(data + 1, &ping_id, 4);
memcpy(data + 5, self_client_id, CLIENT_ID_SIZE);
memcpy(data + 1, self_public_key, CLIENT_ID_SIZE);
memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES);
memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len);
return sendpacket(ip_port, data, sizeof(data));
@ -482,65 +497,117 @@ int pingreq(IP_Port ip_port)
//send a ping response
int pingres(IP_Port ip_port, uint32_t ping_id)
static int pingres(IP_Port ip_port, uint8_t * public_key, uint64_t ping_id)
{
uint8_t data[5 + CLIENT_ID_SIZE];
data[0] = 1;
if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is gonna be sent to ourself
{
return 1;
}
memcpy(data + 1, &ping_id, 4);
memcpy(data + 5, self_client_id, CLIENT_ID_SIZE);
uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING];
uint8_t encrypt[sizeof(ping_id) + ENCRYPTION_PADDING];
uint8_t nonce[crypto_box_NONCEBYTES];
random_nonce(nonce);
int len = encrypt_data(public_key, self_secret_key, nonce, (uint8_t *)&ping_id, sizeof(ping_id), encrypt);
if(len != sizeof(ping_id) + ENCRYPTION_PADDING)
{
return -1;
}
data[0] = 1;
memcpy(data + 1, self_public_key, CLIENT_ID_SIZE);
memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES);
memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len);
return sendpacket(ip_port, data, sizeof(data));
}
//send a getnodes request
int getnodes(IP_Port ip_port, uint8_t * client_id)
static int getnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id)
{
if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is gonna be sent to ourself
{
return 1;
}
if(is_gettingnodes(ip_port, 0))
{
return 1;
}
int ping_id = add_gettingnodes(ip_port);
uint64_t ping_id = add_gettingnodes(ip_port);
if(ping_id == 0)
{
return 1;
}
uint8_t data[5 + CLIENT_ID_SIZE*2];
data[0] = 2;
uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING];
uint8_t plain[sizeof(ping_id) + CLIENT_ID_SIZE];
uint8_t encrypt[sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING];
uint8_t nonce[crypto_box_NONCEBYTES];
random_nonce(nonce);
memcpy(data + 1, &ping_id, 4);
memcpy(data + 5, self_client_id, CLIENT_ID_SIZE);
memcpy(data + 5 + CLIENT_ID_SIZE, client_id, CLIENT_ID_SIZE);
memcpy(plain, &ping_id, sizeof(ping_id));
memcpy(plain + sizeof(ping_id), client_id, CLIENT_ID_SIZE);
int len = encrypt_data(public_key, self_secret_key, nonce, plain, sizeof(ping_id) + CLIENT_ID_SIZE, encrypt);
if(len != sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING)
{
return -1;
}
data[0] = 2;
memcpy(data + 1, self_public_key, CLIENT_ID_SIZE);
memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES);
memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len);
return sendpacket(ip_port, data, sizeof(data));
}
//send a send nodes response
int sendnodes(IP_Port ip_port, uint8_t * client_id, uint32_t ping_id)
static int sendnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id, uint64_t ping_id)
{
uint8_t data[5 + CLIENT_ID_SIZE + (CLIENT_ID_SIZE + sizeof(IP_Port))*MAX_SENT_NODES];
if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is gonna be sent to ourself
{
return 1;
}
uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id)
+ sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING];
Node_format nodes_list[MAX_SENT_NODES];
int num_nodes = get_close_nodes(client_id, nodes_list);
if(num_nodes == 0)
{
return 0;
}
uint8_t plain[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES];
uint8_t encrypt[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING];
uint8_t nonce[crypto_box_NONCEBYTES];
random_nonce(nonce);
memcpy(plain, &ping_id, sizeof(ping_id));
memcpy(plain + sizeof(ping_id), nodes_list, num_nodes * sizeof(Node_format));
int len = encrypt_data(public_key, self_secret_key, nonce, plain,
sizeof(ping_id) + num_nodes * sizeof(Node_format), encrypt);
if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format) + ENCRYPTION_PADDING)
{
return -1;
}
data[0] = 3;
memcpy(data + 1, &ping_id, 4);
memcpy(data + 5, self_client_id, CLIENT_ID_SIZE);
memcpy(data + 5 + CLIENT_ID_SIZE, nodes_list, num_nodes * (CLIENT_ID_SIZE + sizeof(IP_Port)));
return sendpacket(ip_port, data, 5 + CLIENT_ID_SIZE + num_nodes * (CLIENT_ID_SIZE + sizeof(IP_Port)));
memcpy(data + 1, self_public_key, CLIENT_ID_SIZE);
memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES);
memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len);
return sendpacket(ip_port, data, 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + len);
}
@ -550,26 +617,32 @@ int sendnodes(IP_Port ip_port, uint8_t * client_id, uint32_t ping_id)
//Packet handling functions
//One to handle each types of packets we receive
//return 0 if handled correctly, 1 if packet is bad.
int handle_pingreq(uint8_t * packet, uint32_t length, IP_Port source)//tested
int handle_pingreq(uint8_t * packet, uint32_t length, IP_Port source)
{
if(length != 5 + CLIENT_ID_SIZE)
uint64_t ping_id;
if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING)
{
return 1;
}
if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is from ourself.
{
return 1;
}
uint32_t ping_id;
memcpy(&ping_id, packet + 1, 4);
IP_Port bad_ip = {{{0}}, 0};
if(is_pinging(bad_ip, ping_id))//check if packet is from ourself.
int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE,
packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES,
sizeof(ping_id) + ENCRYPTION_PADDING, (uint8_t *)&ping_id);
if(len != sizeof(ping_id))
{
return 1;
}
pingres(source, ping_id);
pingres(source, packet + 1, ping_id);
pingreq(source);
pingreq(source, packet + 1);//TODO: make this smarter?
return 0;
@ -577,16 +650,29 @@ int handle_pingreq(uint8_t * packet, uint32_t length, IP_Port source)//tested
int handle_pingres(uint8_t * packet, uint32_t length, IP_Port source)
{
if(length != (5 + CLIENT_ID_SIZE))
uint64_t ping_id;
if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING)
{
return 1;
}
if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is from ourself.
{
return 1;
}
int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE,
packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES,
sizeof(ping_id) + ENCRYPTION_PADDING, (uint8_t *)&ping_id);
if(len != sizeof(ping_id))
{
return 1;
}
uint32_t ping_id;
memcpy(&ping_id, packet + 1, 4);
if(is_pinging(source, ping_id))
{
addto_lists(source, packet + 5);
addto_lists(source, packet + 1);
return 0;
}
return 1;
@ -595,53 +681,80 @@ int handle_pingres(uint8_t * packet, uint32_t length, IP_Port source)
int handle_getnodes(uint8_t * packet, uint32_t length, IP_Port source)
{
if(length != (5 + CLIENT_ID_SIZE*2))
uint64_t ping_id;
if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING)
{
return 1;
}
uint32_t ping_id;
memcpy(&ping_id, packet + 1, 4);
sendnodes(source, packet + 5 + CLIENT_ID_SIZE, ping_id);
IP_Port bad_ip = {{{0}}, 0};
if(is_gettingnodes(bad_ip, ping_id))//check if packet is from ourself.
if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0)//check if packet is from ourself.
{
return 1;
}
pingreq(source);
uint8_t plain[sizeof(ping_id) + CLIENT_ID_SIZE];
int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE,
packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES,
sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING, plain);
if(len != sizeof(ping_id) + CLIENT_ID_SIZE)
{
return 1;
}
memcpy(&ping_id, plain, sizeof(ping_id));
sendnodes(source, packet + 1, plain + sizeof(ping_id), ping_id);
pingreq(source, packet + 1);//TODO: make this smarter?
return 0;
}
int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source)//tested
int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source)
{
if(length > (5 + CLIENT_ID_SIZE + MAX_SENT_NODES * (CLIENT_ID_SIZE + sizeof(IP_Port))) ||
(length - 5 - CLIENT_ID_SIZE) % (CLIENT_ID_SIZE + sizeof(IP_Port)) != 0)
uint64_t ping_id;
if(length > (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id)
+ sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING) ||
(length - (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id)
+ ENCRYPTION_PADDING)) % (sizeof(Node_format)) != 0 ||
length < 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id)
+ sizeof(Node_format) + ENCRYPTION_PADDING)
{
return 1;
}
uint32_t num_nodes = (length - 5 - CLIENT_ID_SIZE) / (CLIENT_ID_SIZE + sizeof(IP_Port));
uint32_t i;
uint32_t ping_id;
uint32_t num_nodes = (length - (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES
+ sizeof(ping_id) + ENCRYPTION_PADDING)) / sizeof(Node_format);
memcpy(&ping_id, packet + 1, 4);
uint8_t plain[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES];
int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE,
packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES,
sizeof(ping_id) + num_nodes * sizeof(Node_format) + ENCRYPTION_PADDING, plain);
if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format))
{
return 1;
}
memcpy(&ping_id, plain, sizeof(ping_id));
if(!is_gettingnodes(source, ping_id))
{
return 1;
}
Node_format nodes_list[MAX_SENT_NODES];
memcpy(nodes_list, packet + 5 + CLIENT_ID_SIZE, num_nodes * (CLIENT_ID_SIZE + sizeof(IP_Port)));
memcpy(nodes_list, plain + sizeof(ping_id), num_nodes * sizeof(Node_format));
uint32_t i;
for(i = 0; i < num_nodes; i++)
{
pingreq(nodes_list[i].ip_port);
pingreq(nodes_list[i].ip_port, nodes_list[i].client_id);
}
addto_lists(source, packet + 5);
addto_lists(source, packet + 1);
return 0;
}
@ -772,7 +885,7 @@ void doDHTFriends()
{
if((friends_list[i].client_list[j].last_pinged + PING_INTERVAL) <= temp_time)
{
pingreq(friends_list[i].client_list[j].ip_port);
pingreq(friends_list[i].client_list[j].ip_port, friends_list[i].client_list[j].client_id);
friends_list[i].client_list[j].last_pinged = temp_time;
}
if(friends_list[i].client_list[j].timestamp + BAD_NODE_TIMEOUT > temp_time)//if node is good.
@ -786,7 +899,8 @@ void doDHTFriends()
{
rand_node = rand() % num_nodes;
getnodes(friends_list[i].client_list[index[rand_node]].ip_port,
friends_list[i].client_list[index[rand_node]].client_id);
friends_list[i].client_list[index[rand_node]].client_id,
friends_list[i].client_id);
friend_lastgetnode[i] = temp_time;
}
}
@ -810,7 +924,7 @@ void doClose()//tested
{
if((close_clientlist[i].last_pinged + PING_INTERVAL) <= temp_time)
{
pingreq(close_clientlist[i].ip_port);
pingreq(close_clientlist[i].ip_port, close_clientlist[i].client_id);
close_clientlist[i].last_pinged = temp_time;
}
if(close_clientlist[i].timestamp + BAD_NODE_TIMEOUT > temp_time)//if node is good.
@ -825,7 +939,8 @@ void doClose()//tested
{
rand_node = rand() % num_nodes;
getnodes(close_clientlist[index[rand_node]].ip_port,
close_clientlist[index[rand_node]].client_id);
close_clientlist[index[rand_node]].client_id,
self_public_key);
close_lastgetnodes = temp_time;
}
@ -842,10 +957,10 @@ void doDHT()
void DHT_bootstrap(IP_Port ip_port)
void DHT_bootstrap(IP_Port ip_port, uint8_t * public_key)
{
getnodes(ip_port, self_client_id);
getnodes(ip_port, public_key, self_public_key);
}

12
core/DHT.h
View File

@ -26,13 +26,13 @@
#ifndef DHT_H
#define DHT_H
#include "network.h"
#include "net_crypto.h"
//Current time, unix format
#define unix_time() ((uint32_t)time(NULL))
//size of the client_id in bytes
#define CLIENT_ID_SIZE 32
#define CLIENT_ID_SIZE crypto_box_PUBLICKEYBYTES
@ -68,18 +68,14 @@ void doDHT();
int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source);
//Use this function to bootstrap the client
//Sends a get nodes request to the given ip port
void DHT_bootstrap(IP_Port ip_port);
//Sends a get nodes request to the given node with ip port and public_key
void DHT_bootstrap(IP_Port ip_port, uint8_t * public_key);
//TODO:
//Add functions to save and load the state(client list, friends list)
//Global variables
//Our client id
extern uint8_t self_client_id[CLIENT_ID_SIZE];

15
core/Messenger.c
View File

@ -42,10 +42,10 @@ typedef struct
#define MAX_NUM_FRIENDS 256
Friend friendlist[MAX_NUM_FRIENDS];
static Friend friendlist[MAX_NUM_FRIENDS];
uint32_t numfriends;
static uint32_t numfriends;
//return the friend id associated to that public key.
@ -189,7 +189,7 @@ int m_sendmessage(int friendnumber, uint8_t * message, uint32_t length)
}
void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
static void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
//set the function that will be executed when a friend request is received.
void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
@ -198,7 +198,7 @@ void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
}
void (*friend_message)(int, uint8_t *, uint16_t);
static void (*friend_message)(int, uint8_t *, uint16_t);
//set the function that will be executed when a message from a friend is received.
void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t))
@ -216,11 +216,10 @@ void initMessenger()
IP ip;
ip.i = 0;
init_networking(ip, PORT);
memcpy(self_client_id, self_public_key, crypto_box_PUBLICKEYBYTES);
}
void doFriends()
static void doFriends()
{//TODO: add incoming connections and some other stuff.
uint32_t i;
int len;
@ -280,7 +279,7 @@ void doFriends()
}
}
void doFriendRequest()
static void doFriendRequest()
{
uint8_t public_key[crypto_box_PUBLICKEYBYTES];
uint8_t temp[MAX_DATA_SIZE];
@ -296,7 +295,7 @@ void doFriendRequest()
void doInbound()
static void doInbound()
{
uint8_t secret_nonce[crypto_box_NONCEBYTES];
uint8_t public_key[crypto_box_PUBLICKEYBYTES];

12
core/net_crypto.c
View File

@ -50,17 +50,17 @@ typedef struct
#define MAX_CRYPTO_CONNECTIONS 256
Crypto_Connection crypto_connections[MAX_CRYPTO_CONNECTIONS];
static Crypto_Connection crypto_connections[MAX_CRYPTO_CONNECTIONS];
#define MAX_FRIEND_REQUESTS 32
//keeps track of the connection numbers for friends request so we can check later if they were sent
int outbound_friendrequests[MAX_FRIEND_REQUESTS];
static int outbound_friendrequests[MAX_FRIEND_REQUESTS];
#define MAX_INCOMING 64
//keeps track of the connection numbers for friends request so we can check later if they were sent
int incoming_connections[MAX_INCOMING];
static int incoming_connections[MAX_INCOMING];
//encrypts plain of length length to encrypted of length + 16 using the
//public key(32 bytes) of the receiver and the secret key of the sender and a 24 byte nonce
@ -587,7 +587,7 @@ int new_incoming(int id)
//TODO: optimize this
//handle all new incoming connections.
void handle_incomings()
static void handle_incomings()
{
int income;
while(1)
@ -601,7 +601,7 @@ void handle_incomings()
}
//handle received packets for not yet established crypto connections.
void receive_crypto()
static void receive_crypto()
{
uint32_t i;
for(i = 0; i < MAX_CRYPTO_CONNECTIONS; i++)
@ -687,7 +687,7 @@ void initNetCrypto()
memset(incoming_connections, -1 ,sizeof(incoming_connections));
}
void killTimedout()
static void killTimedout()
{
uint32_t i;
for(i = 0; i < MAX_CRYPTO_CONNECTIONS; i++)

7
core/net_crypto.h
View File

@ -32,8 +32,9 @@
#endif
//Our public key.
extern uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
extern uint8_t self_secret_key[crypto_box_SECRETKEYBYTES];
#define ENCRYPTION_PADDING (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES)
//encrypts plain of length length to encrypted of length + 16 using the
//public key(32 bytes) of the receiver and the secret key of the sender and a 24 byte nonce
@ -51,6 +52,10 @@ int decrypt_data(uint8_t * public_key, uint8_t * secret_key, uint8_t * nonce,
uint8_t * encrypted, uint32_t length, uint8_t * plain);
//fill the given nonce with random bytes.
void random_nonce(uint8_t * nonce);
//return 0 if there is no received data in the buffer
//return -1 if the packet was discarded.
//return length of received data if successful

19
core/network.h
View File

@ -39,8 +39,7 @@
#include <winsock2.h>
#include <windows.h>
//we use libsodium (Portable version of NaCl) because stock NaCl doesn't compile on windows.
#include <sodium.h>
#undef VANILLA_NACL//make sure on windows we use libsodium
#else //Linux includes
@ -50,13 +49,21 @@
#include <errno.h>
#include <sys/time.h>
//TODO: Including stuff like this is bad. This needs fixing.
//We keep support for the original NaCl for now on UNIX like Operating Systems.
//Commented out for now
//#include "../nacl/build/Linux/include/amd64/crypto_box.h"
#endif
#ifndef VANILLA_NACL
//we use libsodium by default
#include <sodium.h>
#else
//TODO: Including stuff like this is bad. This needs fixing.
//We keep support for the original NaCl for now.
#include "../nacl/build/Linux/include/amd64/crypto_box.h"
#endif
#define MAX_UDP_PACKET_SIZE 65507
typedef union

9
docs/DHT.txt
View File

@ -2,7 +2,7 @@ DHT protocol:
Follows pretty much the principle of the torrent DHT: http://www.bittorrent.org/beps/bep_0005.html (READ IT)
But:
Vastly simplified packet format.
Vastly simplified packet format and encryption.
Boostrapping:
The first time you install the client we bootstrap it with a node on our servers.(bandwidth should not be a problem as the client only needs to be sent one reply.)
@ -75,13 +75,12 @@ DHT protocol:
Valid queries and Responses:
Ping(Request and response): [byte with value: 00 for request, 01 for response][random 4 byte (ping_id)][char array (client node_id), length=32 bytes]
Ping(Request and response): [byte with value: 00 for request, 01 for response][char array (client node_id), length=32 bytes][random 24 byte nonce][Encrypted with the nonce and private key of the sender: [random 8 byte (ping_id)]]
ping_id = a random integer, the response must contain the exact same number as the request
Get nodes (Request):
Packet contents: [byte with value: 02][random 4 byte (ping_id)][char array (client node_id), length=32 bytes][char array: requested_node_id (node_id of which we want the ip), length=32 bytes]
Packet contents: [byte with value: 02][char array (client node_id), length=32 bytes][random 24 byte nonce][Encrypted with the nonce and private key of the sender:[random 8 byte (ping_id)][char array: requested_node_id (node_id of which we want the ip), length=32 bytes]]
Valid replies: a send_nodes packet
Send_nodes (response): [byte with value: 03][random 4 byte (ping_id)][char array (client node_id), length=32 bytes][Nodes in node format, length=40 * (number of nodes (maximum of 8 nodes)) bytes]
ex: 03[Node][Node][Node]
Send_nodes (response): [byte with value: 03][char array (client node_id), length=32 bytes][random 24 byte nonce][Encrypted with the nonce and private key of the sender:[random 8 byte (ping_id)][Nodes in node format, length=40 * (number of nodes (maximum of 8 nodes)) bytes]]

46
testing/DHT_test.c
View File

@ -3,10 +3,12 @@
*
* Compile with: gcc -O2 -Wall -o test ../core/network.c DHT_test.c
*
* Command line arguments are the ip and port of a node and the client_id (32 bytes) of the friend you want to find the ip_port of
* EX: ./test 127.0.0.1 33445 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdef
* Command line arguments are the ip, port and public key of a node.
* EX: ./test 127.0.0.1 33445 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
*
* The test will then ask you for the id (in hex format) of the friend you wish to add
*/
#include "../core/network.h"
//#include "../core/network.h"
#include "../core/DHT.c"
#include <string.h>
@ -94,15 +96,44 @@ void printpacket(uint8_t * data, uint32_t length, IP_Port ip_port)
printf("\n--------------------END-----------------------------\n\n\n");
}
//horrible function from one of my first C programs.
//only here because I was too lazy to write a proper one.
unsigned char * hex_string_to_bin(char hex_string[])
{
unsigned char * val = malloc(strlen(hex_string));
char * pos = hex_string;
int i=0;
while(i < strlen(hex_string))
{
sscanf(pos,"%2hhx",&val[i]);
pos+=2;
i++;
}
return val;
}
int main(int argc, char *argv[])
{
//memcpy(self_client_id, "qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq", 32);
if (argc < 4) {
printf("usage %s ip port client_id(of friend to find ip_port of)\n", argv[0]);
printf("usage %s ip port public_key\n", argv[0]);
exit(0);
}
DHT_addfriend((uint8_t *)argv[3]);
new_keys();
printf("OUR ID: ");
uint32_t i;
for(i = 0; i < 32; i++)
{
if(self_public_key[i] < 16)
printf("0");
printf("%hhX",self_public_key[i]);
}
char temp_id[128];
printf("\nEnter the client_id of the friend you wish to add (32 bytes HEX format):\n");
scanf("%s", temp_id);
DHT_addfriend(hex_string_to_bin(temp_id));
//initialize networking
//bind to ip 0.0.0.0:PORT
@ -110,8 +141,7 @@ int main(int argc, char *argv[])
ip.i = 0;
init_networking(ip, PORT);
int randdomnum = random_int();
memcpy(self_client_id, &randdomnum, 4);
perror("Initialization");
@ -122,7 +152,7 @@ int main(int argc, char *argv[])
//bootstrap_ip_port.ip.c[2] = 0;
//bootstrap_ip_port.ip.c[3] = 1;
bootstrap_ip_port.ip.i = inet_addr(argv[1]);
DHT_bootstrap(bootstrap_ip_port);
DHT_bootstrap(bootstrap_ip_port, hex_string_to_bin(argv[3]));
IP_Port ip_port;
uint8_t data[MAX_UDP_PACKET_SIZE];

13
testing/Messenger_test.c
View File

@ -7,7 +7,7 @@
* If it recieves a message from a friend it replies back.
*
*
* This is how I compile it: gcc -O2 -Wall -o test ../core/Lossless_UDP.c ../core/network.c ../core/net_crypto.c ../core/DHT.c ../core/Messenger.c ../nacl/build/${HOSTNAME%.*}/lib/amd64/* Messenger_test.c
* This is how I compile it: gcc -O2 -Wall -D VANILLA_NACL -o test ../core/Lossless_UDP.c ../core/network.c ../core/net_crypto.c ../core/Messenger.c ../core/DHT.c ../nacl/build/${HOSTNAME%.*}/lib/amd64/{cpucycles.o,libnacl.a,randombytes.o} Messenger_test.c
*
*
* Command line arguments are the ip and port of a node (for bootstrapping).
@ -77,8 +77,8 @@ void print_message(int friendnumber, uint8_t * string, uint16_t length)
int main(int argc, char *argv[])
{
if (argc < 3) {
printf("usage %s ip port (of the DHT bootstrap node)\n", argv[0]);
if (argc < 4) {
printf("usage %s ip port public_key (of the DHT bootstrap node)\n", argv[0]);
exit(0);
}
initMessenger();
@ -96,14 +96,17 @@ int main(int argc, char *argv[])
char temp_id[128];
printf("\nEnter the client_id of the friend you wish to add (32 bytes HEX format):\n");
scanf("%s", temp_id);
if(scanf("%s", temp_id) != 1)
{
return 1;
}
int num = m_addfriend(hex_string_to_bin(temp_id), (uint8_t*)"Install Gentoo", sizeof("Install Gentoo"));
perror("Initialization");
IP_Port bootstrap_ip_port;
bootstrap_ip_port.port = htons(atoi(argv[2]));
bootstrap_ip_port.ip.i = inet_addr(argv[1]);
DHT_bootstrap(bootstrap_ip_port);
DHT_bootstrap(bootstrap_ip_port, hex_string_to_bin(argv[3]));
while(1)
{