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- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <stdint.h>
- #include <errno.h>
- #include <string.h>
- #include <sys/socket.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <pthread.h>
- #include <fcntl.h>
- #include <arpa/inet.h>
- #include <openssl/bio.h>
- #include <openssl/evp.h>
- #include <openssl/buffer.h>
- #include <openssl/rand.h>
- #include "socks5proxy.h"
- #include "crypto.h"
- #include "tagging.h"
- #include "util.h"
- static connection_table *connections;
- typedef struct {
- int32_t in;
- int32_t out;
- } ous_pipes;
- int main(void){
- int listen_socket;
-
- struct sockaddr_in address;
- struct sockaddr_in remote_addr;
- socklen_t addr_size;
- connections = calloc(1, sizeof(connection_table));
- connections->first = NULL;
-
- int32_t ous_in[2];
- if(pipe(ous_in) < 0){
- printf("Failed to create pipe\n");
- return 1;
- }
- int32_t ous_out[2];
- if(pipe(ous_out) < 0){
- printf("Failed to create pipe\n");
- return 1;
- }
- ous_pipes pipes;
- pipes.in = ous_in[0];
- pipes.out = ous_out[1];
-
-
- pthread_t *ous_thread = calloc(1, sizeof(pthread_t));
- pthread_create(ous_thread, NULL, ous_IO, (void *) &pipes);
- ous_pipes mux_pipes;
- mux_pipes.in = ous_in[1];
- mux_pipes.out = ous_out[0];
-
- pthread_t *demux_thread = calloc(1, sizeof(pthread_t));
- pthread_create(demux_thread, NULL, demultiplex_data, (void *) &mux_pipes);
- pthread_t *mux_thread = calloc(1, sizeof(pthread_t));
- pthread_create(mux_thread, NULL, multiplex_data, (void *) &mux_pipes);
- if (!(listen_socket = socket(AF_INET, SOCK_STREAM, 0))){
- printf("Error creating socket\n");
- fflush(stdout);
- return 1;
- }
- address.sin_family = AF_INET;
- address.sin_addr.s_addr = INADDR_ANY;
- address.sin_port = htons(1080);
- int enable = 1;
- if (setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) <0 ){
- printf("Error setting sockopt\n");
- return 1;
- }
- if(bind(listen_socket, (struct sockaddr *) &address, sizeof(address))){
- printf("Error binding socket\n");
- fflush(stdout);
- return 1;
- }
- if(listen(listen_socket, 10) < 0){
- printf("Error listening\n");
- fflush(stdout);
- close(listen_socket);
- exit(1);
- }
- uint8_t last_id = 1;
- printf("Ready for listening\n");
- for(;;){
- addr_size = sizeof(remote_addr);
- int new_socket;
- new_socket = accept(listen_socket, (struct sockaddr *) &remote_addr,
- &addr_size);
- if(new_socket < 0){
- perror("accept");
- exit(1);
- }
- printf("New connection\n");
-
- connection *new_conn = calloc(1, sizeof(connection));
- new_conn->stream_id = last_id++;
-
- new_conn->socket = new_socket;
- new_conn->state = NEW_STREAM;
- new_conn->next = NULL;
-
- if(connections->first == NULL){
- connections->first = new_conn;
- printf("Added first connection with id: %d\n", new_conn->stream_id);
- fflush(stdout);
- } else {
- connection *last = connections->first;
- while(last->next != NULL){
- last = last->next;
- }
- last->next = new_conn;
- printf("Added connection with id: %d at %p\n", new_conn->stream_id, last->next);
- fflush(stdout);
- }
- }
- return 0;
- }
- void *ous_IO(void *args){
- ous_pipes *pipes = (ous_pipes *) args;
- int32_t ous_in = pipes->in;
- int32_t ous_out = pipes->out;
-
- uint8_t slitheen_id[SLITHEEN_ID_LEN];
- uint8_t shared_secret[16];
- generate_slitheen_id(slitheen_id, shared_secret);
- #ifdef DEBUG
- printf("Randomly generated slitheen id: ");
- int i;
- for(i=0; i< SLITHEEN_ID_LEN; i++){
- printf("%02x ", slitheen_id[i]);
- }
- printf("\n");
- #endif
-
- generate_super_keys(shared_secret);
- printf("Generated super encrypt keys\n");
- char *encoded_bytes = NULL;
- base64_encode(slitheen_id, SLITHEEN_ID_LEN, &encoded_bytes);
- printf("Encoded ID\n");
-
- struct sockaddr_in ous_addr;
- ous_addr.sin_family = AF_INET;
- inet_pton(AF_INET, "127.0.0.1", &(ous_addr.sin_addr));
- ous_addr.sin_port = htons(57173);
- int32_t ous = socket(AF_INET, SOCK_STREAM, 0);
- if(ous < 0){
- printf("Failed to make socket\n");
- pthread_exit(NULL);
- }
- int32_t error = connect(ous, (struct sockaddr *) &ous_addr, sizeof (struct sockaddr));
- if(error < 0){
- printf("Error connecting to OUS\n");
- pthread_exit(NULL);
- }
- printf("Connected to OUS\n");
- uint16_t len = htons(strlen(encoded_bytes));
- int32_t bytes_sent = send(ous, (unsigned char *) &len, sizeof(uint16_t), 0);
- bytes_sent += send(ous, encoded_bytes, ntohs(len), 0);
- printf("Wrote %d bytes to OUS_in: %x\n %s\n", bytes_sent, len, encoded_bytes);
- uint8_t *buffer = emalloc(BUFSIZ);
- int32_t buffer_len = BUFSIZ;
- int32_t bytes_read;
-
- for(;;){
- fd_set read_fds;
- fd_set write_fds;
- int32_t nfds = ous;
- if(ous_in > nfds)
- nfds = ous_in;
- if(ous_out > nfds)
- nfds = ous_out;
- FD_ZERO(&read_fds);
- FD_ZERO(&write_fds);
- FD_SET(ous_in, &read_fds);
- FD_SET(ous, &read_fds);
- FD_SET(ous_out, &write_fds);
- FD_SET(ous, &write_fds);
- if(select(nfds+1, &read_fds, &write_fds, NULL, NULL) < 0){
- fprintf(stderr, "Select error\n");
- break;
- }
- if(FD_ISSET(ous_in, &read_fds) && FD_ISSET(ous, &write_fds)){
- bytes_read = read(ous_in, buffer, buffer_len);
- #ifdef DEBUG_IO
- printf("Received %d bytes from multiplexer\n", bytes_read);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
- if(bytes_read > 0){
- bytes_sent = send(ous, buffer, bytes_read, 0);
- #ifdef DEBUG_IO
- printf("Sent %d bytes to OUS\n", bytes_sent);
- for(int i=0; i< bytes_sent; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
- if(bytes_sent <= 0){
- fprintf(stderr, "Connection to OUS closed\n");
- break;
- }
- } else if (bytes_read == 0) {
- fprintf(stderr, "Connection to multiplexer closed\n");
- break;
- } else {
- fprintf(stderr, "Error reading from multiplexer\n");
- break;
- }
- }
- if(FD_ISSET(ous, &read_fds) && FD_ISSET(ous_out, &write_fds)){
- bytes_read = recv(ous, buffer, 4, 0);
- #ifdef DEBUG_IO
- printf("Received %d bytes from OUS\n", bytes_read);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
- if (bytes_read <= 0) {
- fprintf(stderr, "Connection to OUS closed\n");
- break;
- }
- uint32_t *chunk_len = (uint32_t*) buffer;
-
- fprintf(stderr, "Length of this chunk: %u\n", *chunk_len);
-
- bytes_read = recv(ous, buffer, *chunk_len, 0);
- #ifdef DEBUG_IO
- printf("Received %d bytes from OUS\n", bytes_read);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
- if(bytes_read > 0){
- bytes_sent = write(ous_out, buffer, bytes_read);
- #ifdef DEBUG_IO
- printf("Sent %d bytes to demultiplexer\n", bytes_sent);
- for(int i=0; i< bytes_sent; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
- if(bytes_sent <= 0){
- fprintf(stderr, "Connection to demultiplexer closed\n");
- break;
- }
- } else if (bytes_read == 0) {
- fprintf(stderr, "Connection to OUS closed\n");
- break;
- } else {
- fprintf(stderr, "Error reading from OUS\n");
- break;
- }
- }
- }
- fprintf(stderr, "Closing OUS\n");
- close(ous);
- close(ous_in);
- close(ous_out);
- free(buffer);
- pthread_exit(NULL);
- }
- void *multiplex_data(void *args){
- ous_pipes *pipes = (ous_pipes *) args;
- int32_t buffer_len = BUFSIZ;
- uint8_t *buffer = ecalloc(1, buffer_len);
- int32_t bytes_read;
- uint8_t *response = ecalloc(1, BUFSIZ);
-
- for(;;){
- fd_set read_fds;
- fd_set write_fds;
- int32_t nfds = 0;
- FD_ZERO(&read_fds);
- FD_ZERO(&write_fds);
-
- connection *conn = connections->first;
- while(conn != NULL){
- if(conn->socket > nfds)
- nfds = conn->socket;
- FD_SET(conn->socket, &read_fds);
- conn = conn->next;
- }
- FD_SET(pipes->in, &write_fds);
- if(pipes->in > nfds)
- nfds = pipes->in;
- struct timeval tv;
- tv.tv_sec = 3;
- tv.tv_usec = 0;
- if(select(nfds+1, &read_fds, &write_fds, NULL, &tv) < 0){
- fprintf(stderr, "Select error\n");
- break;
- }
- struct slitheen_up_hdr *up_hdr;
- uint16_t len;
- char *encoded_bytes = NULL;
- conn = connections->first;
- while(conn != NULL){
- uint8_t stream_id = conn->stream_id;
- if(FD_ISSET(conn->socket, &read_fds) && FD_ISSET(pipes->in, &write_fds)){
- printf("Reading from stream %d\n", conn->stream_id);
- bytes_read = recv(conn->socket, buffer, buffer_len, 0);
- if(bytes_read < 0){
- close(conn->socket);
- conn = conn->next;
- remove_connection(stream_id);
- continue;
- } else if(bytes_read == 0){
-
- printf("Closing connection for stream %d sockfd.\n", conn->stream_id);
- fflush(stdout);
- if(conn->state == CONNECTED){
-
- up_hdr = (struct slitheen_up_hdr *) buffer;
- up_hdr->stream_id = conn->stream_id;
- up_hdr->len = 0;
- base64_encode(buffer, 20, &encoded_bytes);
- len = htons(strlen(encoded_bytes));
- int32_t bytes_sent = write(pipes->in, (unsigned char *) &len, sizeof(uint16_t));
- bytes_sent += write(pipes->in, encoded_bytes, ntohs(len));
- printf("Wrote %d bytes to ous\n", bytes_sent);
- printf("Closing message: %s\n", encoded_bytes);
- free(encoded_bytes);
- encoded_bytes = NULL;
- }
- close(conn->socket);
- conn = conn->next;
- remove_connection(stream_id);
- continue;
- }
- switch(conn->state){
- case NEW_STREAM:
- printf("Received new stream data from stream %d\n", conn->stream_id);
- #ifdef DEBUG
- printf("Received %d bytes (id %d):\n", bytes_read, conn->stream_id);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
-
- struct socks_method_req *clnt_meth = (struct socks_method_req *) buffer;
- uint8_t *p = buffer + 2;
- if(clnt_meth->version != 0x05){
- close(conn->socket);
- printf("Client supplied invalid version: %02x\n", clnt_meth->version);
- fflush(stdout);
- conn = conn->next;
- remove_connection(stream_id);
- continue;
- }
- int responded = 0;
- int bytes_sent;
- for(int i=0; i< clnt_meth->num_methods; i++){
- if(p[0] == 0x00){
- response[0] = 0x05;
- response[1] = 0x00;
- send(conn->socket, response, 2, 0);
- responded = 1;
- }
- p++;
- }
- if(!responded){
- response[0] = 0x05;
- response[1] = 0xFF;
- send(conn->socket, response, 2, 0);
- close(conn->socket);
- conn = conn->next;
- remove_connection(stream_id);
- continue;
- }
- conn->state = NEGOTIATED;
- break;
- case NEGOTIATED:
- printf("Received negotiation data from stream %d\n", conn->stream_id);
- #ifdef DEBUG
- printf("Received %d bytes (id %d):\n", bytes_read, conn->stream_id);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- fflush(stdout);
- #endif
-
- response[0] = 0x05;
- response[1] = 0x00;
- response[2] = 0x00;
- response[3] = 0x01;
- *((uint32_t *) (response + 4)) = 0;
- *((uint16_t *) (response + 8)) = 0;
- send(conn->socket, response, 10, 0);
- memmove(buffer+sizeof(struct slitheen_up_hdr), buffer, bytes_read);
- up_hdr = (struct slitheen_up_hdr *) buffer;
- up_hdr->stream_id = conn->stream_id;
- up_hdr->len = htons(bytes_read);
- bytes_read+= sizeof(struct slitheen_up_hdr);
- base64_encode(buffer, bytes_read, &encoded_bytes);
- len = htons(strlen(encoded_bytes));
- bytes_sent = write(pipes->in, (unsigned char *) &len, sizeof(uint16_t));
- bytes_sent += write(pipes->in, encoded_bytes, ntohs(len));
- printf("Wrote %d bytes to ous\n", bytes_sent);
- free(encoded_bytes);
- encoded_bytes = NULL;
- conn->state = CONNECTED;
- break;
- case CONNECTED:
- printf("Received application data from stream %d\n", conn->stream_id);
- #ifdef DEBUG_UPSTREAM
- printf("Received %d data bytes from sockfd (id %d):\n", bytes_read, conn->stream_id);
- for(int i=0; i< bytes_read; i++){
- printf("%02x ", buffer[i]);
- }
- printf("\n");
- printf("%s\n", buffer);
- fflush(stdout);
- #endif
- memmove(buffer+sizeof(struct slitheen_up_hdr), buffer, bytes_read);
- up_hdr = (struct slitheen_up_hdr *) buffer;
- up_hdr->stream_id = conn->stream_id;
- up_hdr->len = htons(bytes_read);
- bytes_read+= sizeof(struct slitheen_up_hdr);
- base64_encode(buffer, bytes_read, &encoded_bytes);
- len = htons(strlen(encoded_bytes));
- bytes_sent = write(pipes->in, (unsigned char *) &len, sizeof(uint16_t));
- bytes_sent += write(pipes->in, encoded_bytes, ntohs(len));
- printf("Wrote %d bytes to ous\n", bytes_sent);
- #ifdef DEBUG_UPSTREAM
- printf("Sent to OUS (%d bytes): %x %s\n",bytes_sent, len, encoded_bytes);
- #endif
- free(encoded_bytes);
- encoded_bytes = NULL;
- break;
- default:
- fprintf(stderr, "Wrong connection state\n");
- close(conn->socket);
- conn = conn->next;
- remove_connection(stream_id);
- break;
- }
- }
- conn = conn->next;
- }
- }
- free(response);
- pthread_exit(NULL);
- }
- void *demultiplex_data(void *args){
- ous_pipes *pipes = (ous_pipes *) args;
- int32_t buffer_len = BUFSIZ;
- uint8_t *buffer = calloc(1, buffer_len);
- uint8_t *p;
- uint8_t *partial_block = NULL;
- uint32_t partial_block_len = 0;
- uint64_t expected_next_count = 1;
- data_block *saved_data = NULL;
- for(;;){
- printf("Demux thread waiting to read\n");
- int32_t bytes_read = read(pipes->out, buffer, buffer_len-partial_block_len);
-
- if(bytes_read > 0){
- int32_t chunk_remaining = bytes_read;
- p = buffer;
-
- if(partial_block_len > 0){
-
- memmove(buffer+partial_block_len, buffer, bytes_read);
- memcpy(buffer, partial_block, partial_block_len);
- chunk_remaining += partial_block_len;
- free(partial_block);
- partial_block = NULL;
- partial_block_len = 0;
- }
- while(chunk_remaining > 0){
- #ifdef DEBUG_PARSE
- printf("Received a new chunk of len %d bytes\n", chunk_remaining);
- #endif
- if(chunk_remaining < SLITHEEN_HEADER_LEN){
- #ifdef DEBUG_PARSE
- printf("Partial header: ");
- int i;
- for(i = 0; i< chunk_remaining; i++){
- printf("%02x ", p[i]);
- }
- printf("\n");
- #endif
- if(partial_block != NULL) printf("UH OH (PB)\n");
- partial_block = calloc(1, chunk_remaining);
- memcpy(partial_block, p, chunk_remaining);
- partial_block_len = chunk_remaining;
- chunk_remaining = 0;
- break;
- }
-
- uint8_t *tmp_header = malloc(SLITHEEN_HEADER_LEN);
- memcpy(tmp_header, p, SLITHEEN_HEADER_LEN);
- if(!peek_header(tmp_header)){
- printf("This chunk doesn't contain a Slitheen block\n");
- break;
- }
- struct slitheen_hdr *sl_hdr = (struct slitheen_hdr *) tmp_header;
-
- #ifdef DEBUG_PARSE
- printf("Slitheen header:\n");
- int i;
- for(i = 0; i< SLITHEEN_HEADER_LEN; i++){
- printf("%02x ", tmp_header[i]);
- }
- printf("\n");
- #endif
- if(ntohs(sl_hdr->len) > chunk_remaining){
- printf("ERROR: slitheen block doesn't fit in resource remaining!\n");
- printf("Saving in partial block\n");
- if(partial_block != NULL) printf("UH OH (PB)\n");
- partial_block = calloc(1, ntohs(sl_hdr->len));
- memcpy(partial_block, p, chunk_remaining);
- partial_block_len = chunk_remaining;
- chunk_remaining = 0;
- free(tmp_header);
- break;
- }
- super_decrypt(p);
- sl_hdr = (struct slitheen_hdr *) p;
- free(tmp_header);
- p += SLITHEEN_HEADER_LEN;
- chunk_remaining -= SLITHEEN_HEADER_LEN;
- if((!sl_hdr->len) && (sl_hdr->garbage)){
- #ifdef DEBUG_PARSE
- printf("%d Garbage bytes\n", ntohs(sl_hdr->garbage));
- #endif
- p += ntohs(sl_hdr->garbage);
- chunk_remaining -= ntohs(sl_hdr->garbage);
- continue;
- }
- int32_t sock =-1;
- if(connections->first == NULL){
- printf("Error: there are no connections\n");
- } else {
- connection *last = connections->first;
- if (last->stream_id == sl_hdr->stream_id){
- sock = last->socket;
- }
- while(last->next != NULL){
- last = last->next;
- if (last->stream_id == sl_hdr->stream_id){
- sock = last->socket;
- }
- }
- }
-
- if(sock == -1){
- printf("No stream id exists. Possibly invalid header\n");
- break;
- }
-
- #ifdef DEBUG_PARSE
- printf("Received information for stream id: %d of length: %u\n", sl_hdr->stream_id, ntohs(sl_hdr->len));
- #endif
-
- int32_t padding = 0;
- if(ntohs(sl_hdr->len) %16){
- padding = 16 - ntohs(sl_hdr->len)%16;
- }
- p += 16;
-
- if(sl_hdr->counter > expected_next_count){
-
- printf("Received header with count %lu. Expected count %lu.\n",
- sl_hdr->counter, expected_next_count);
- if((saved_data == NULL) || (saved_data->count > sl_hdr->counter)){
- data_block *new_block = malloc(sizeof(data_block));
- new_block->count = sl_hdr->counter;
- new_block->len = ntohs(sl_hdr->len);
- new_block->data = malloc(ntohs(sl_hdr->len));
- memcpy(new_block->data, p, ntohs(sl_hdr->len));
- new_block->socket = sock;
- new_block->next = saved_data;
- saved_data = new_block;
- } else {
- data_block *last = saved_data;
- while((last->next != NULL) && (last->next->count < sl_hdr->counter)){
- last = last->next;
- }
- data_block *new_block = malloc(sizeof(data_block));
- new_block->count = sl_hdr->counter;
- new_block->len = ntohs(sl_hdr->len);
- new_block->data = malloc(ntohs(sl_hdr->len));
- memcpy(new_block->data, p, ntohs(sl_hdr->len));
- new_block->socket = sock;
- new_block->next = last->next;
- last->next = new_block;
- }
- } else {
- int32_t bytes_sent = send(sock, p, ntohs(sl_hdr->len), 0);
- if(bytes_sent <= 0){
- printf("Error writing to socket for stream id %d\n", sl_hdr->stream_id);
- }
-
- expected_next_count++;
- }
-
- if(saved_data != NULL){
- data_block *current_block = saved_data;
- while((current_block != NULL) && (expected_next_count == current_block->count)){
- int32_t bytes_sent = send(current_block->socket, current_block->data,
- current_block->len, 0);
- if(bytes_sent <= 0){
- printf("Error writing to socket for stream id %d\n", sl_hdr->stream_id);
- }
- expected_next_count++;
- saved_data = current_block->next;
- free(current_block->data);
- free(current_block);
- current_block = saved_data;
- }
- }
- p += ntohs(sl_hdr->len);
- p += 16;
- p += padding;
- p += ntohs(sl_hdr->garbage);
- chunk_remaining -= ntohs(sl_hdr->len) + 16 + padding + 16 + ntohs(sl_hdr->garbage);
- }
- } else {
- printf("Error: read %d bytes from OUS_out\n", bytes_read);
- goto err;
- }
-
- }
- err:
- free(buffer);
- close(pipes->out);
- pthread_exit(NULL);
- }
- int remove_connection(uint16_t stream_id){
- connection *last = connections->first;
- connection *prev = last;
- while(last != NULL){
- if(last->stream_id == stream_id){
- if(last == connections->first){
- connections->first = last->next;
- } else {
- prev->next = last->next;
- }
- free(last);
- printf("Removed stream id %d from connections table\n", stream_id);
- break;
- }
- prev = last;
- last = last->next;
- }
- return 1;
- }
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