/* Copyright (c) 2002 Roger Dingledine. See LICENSE for licensing information */ /* $Id$ */ #ifndef __OR_H #define __OR_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../common/cell.h" #include "../common/config.h" #include "../common/key.h" #include "../common/log.h" #include "../common/ss.h" #include "../common/version.h" #define MAXCONNECTIONS 200 /* upper bound on max connections. can be overridden by config file */ #define MAX_BUF_SIZE (64*1024) #define DEFAULT_BANDWIDTH_OP 1 #define ACI_TYPE_LOWER 0 #define ACI_TYPE_HIGHER 1 #define ACI_TYPE_BOTH 2 /* bitvector of the roles that we might want to play. You can or (|) them together */ #define ROLE_OR_LISTEN 1 #define ROLE_OR_CONNECT_ALL 2 #define ROLE_OP_LISTEN 4 #define ROLE_AP_LISTEN 8 #define CONN_TYPE_OP_LISTENER 1 #define CONN_TYPE_OP 2 #define CONN_TYPE_OR_LISTENER 3 #define CONN_TYPE_OR 4 #define CONN_TYPE_EXIT 5 #define CONN_TYPE_AP_LISTENER 6 #define CONN_TYPE_AP 7 #define LISTENER_STATE_READY 0 #define OP_CONN_STATE_AWAITING_KEYS 0 #define OP_CONN_STATE_OPEN 1 #if 0 #define OP_CONN_STATE_CLOSE 2 /* flushing the buffer, then will close */ #define OP_CONN_STATE_CLOSE_WAIT 3 /* have sent a destroy, awaiting a confirmation */ #endif /* how to read these states: * foo_CONN_STATE_bar_baz: * "I am acting as a bar, currently in stage baz of talking with a foo." */ #define OR_CONN_STATE_OP_CONNECTING 0 /* an application proxy wants me to connect to this OR */ #define OR_CONN_STATE_OP_SENDING_KEYS 1 #define OR_CONN_STATE_CLIENT_CONNECTING 2 /* I'm connecting to this OR as an OR */ #define OR_CONN_STATE_CLIENT_SENDING_AUTH 3 /* sending address and info */ #define OR_CONN_STATE_CLIENT_AUTH_WAIT 4 /* have sent address and info, waiting */ #define OR_CONN_STATE_CLIENT_SENDING_NONCE 5 /* sending nonce, last piece of handshake */ #define OR_CONN_STATE_SERVER_AUTH_WAIT 6 /* waiting for address and info */ #define OR_CONN_STATE_SERVER_SENDING_AUTH 7 /* writing auth and nonce */ #define OR_CONN_STATE_SERVER_NONCE_WAIT 8 /* waiting for confirmation of nonce */ #define OR_CONN_STATE_OPEN 9 /* ready to send/receive cells. */ #define EXIT_CONN_STATE_CONNECTING_WAIT 0 /* waiting for standard structure or dest info */ #define EXIT_CONN_STATE_CONNECTING 1 #define EXIT_CONN_STATE_OPEN 2 #if 0 #define EXIT_CONN_STATE_CLOSE 3 /* flushing the buffer, then will close */ #define EXIT_CONN_STATE_CLOSE_WAIT 4 /* have sent a destroy, awaiting a confirmation */ #endif #define AP_CONN_STATE_SS_WAIT 0 #define AP_CONN_STATE_OR_WAIT 1 #define AP_CONN_STATE_OPEN 2 #define CIRCUIT_STATE_OPEN_WAIT 0 /* receiving/processing the onion */ #define CIRCUIT_STATE_OR_WAIT 1 /* I'm at the beginning of the path, my firsthop is still connecting */ #define CIRCUIT_STATE_OPEN 2 /* onion processed, ready to send data along the connection */ #define CIRCUIT_STATE_CLOSE_WAIT1 3 /* sent two "destroy" signals, waiting for acks */ #define CIRCUIT_STATE_CLOSE_WAIT2 4 /* received one ack, waiting for one more (or if just one was sent, waiting for that one */ //#define CIRCUIT_STATE_CLOSE 4 /* both acks received, connection is dead */ /* NOT USED */ /* available cipher functions */ #define ONION_CIPHER_IDENTITY 0 #define ONION_CIPHER_DES 1 #define ONION_CIPHER_RC4 2 /* default cipher function */ #define ONION_DEFAULT_CIPHER ONION_CIPHER_DES typedef uint16_t aci_t; typedef struct { /* Used by all types: */ unsigned char type; int state; int s; /* our socket */ int poll_index; int marked_for_close; char *inbuf; size_t inbuflen; size_t inbuf_datalen; int inbuf_reached_eof; char *outbuf; size_t outbuflen; size_t outbuf_datalen; // uint16_t aci; /* anonymous connection identifier */ /* used by OR and OP: */ uint32_t bandwidth; /* connection bandwidth */ int window_sent; /* how many cells can i still send? */ int window_received; /* how many cells do i still expect to receive? */ /* link encryption */ unsigned char f_session_key[8]; unsigned char b_session_key[8]; unsigned char f_session_iv[8]; unsigned char b_session_iv[8]; EVP_CIPHER_CTX f_ctx; EVP_CIPHER_CTX b_ctx; // struct timeval lastsend; /* time of last transmission to the client */ // struct timeval interval; /* transmission interval */ uint32_t addr; /* these two uniquely identify a router */ uint16_t port; /* used by exit and ap: */ ss_t ss; /* standard structure */ int ss_received; /* size of ss, received so far */ char *dest_addr, *dest_port; uint16_t dest_addr_len, dest_port_len; uint16_t dest_addr_received, dest_port_received; /* used by OR, to keep state while connect()ing: Kludge. */ RSA *prkey; struct sockaddr_in local; /* link info */ uint32_t min; uint32_t max; char *address; /* strdup into this, because free_connection frees it */ RSA *pkey; /* public RSA key for the other side */ char nonce[8]; } connection_t; /* config stuff we know about the other ORs in the network */ typedef struct { char *address; uint32_t addr; uint16_t or_port; uint16_t op_port; uint16_t ap_port; RSA *pkey; /* public RSA key */ /* link info */ uint32_t min; uint32_t max; // struct timeval min_interval; /* time when last data was sent to that router */ // struct timeval lastsend; /* socket */ // int s; void *next; } routerinfo_t; typedef struct { unsigned int forwf; unsigned int backf; char digest2[20]; /* second SHA output for onion_layer_t.keyseed */ char digest3[20]; /* third SHA output for onion_layer_t.keyseed */ /* IVs */ char f_iv[16]; char b_iv[16]; /* cipher contexts */ EVP_CIPHER_CTX f_ctx; EVP_CIPHER_CTX b_ctx; } crypt_path_t; /* per-anonymous-connection struct */ typedef struct { #if 0 uint32_t p_addr; /* all in network order */ uint16_t p_port; #endif uint32_t n_addr; uint16_t n_port; connection_t *p_conn; connection_t *n_conn; aci_t p_aci; /* connection identifiers */ aci_t n_aci; unsigned char p_f; /* crypto functions */ unsigned char n_f; unsigned char p_key[16]; /* crypto keys */ unsigned char n_key[16]; unsigned char p_iv[16]; /* initialization vectors */ unsigned char n_iv[16]; EVP_CIPHER_CTX p_ctx; /* cipher context */ EVP_CIPHER_CTX n_ctx; crypt_path_t **cpath; size_t cpathlen; uint32_t expire; /* expiration time for the corresponding onion */ int state; unsigned char *onion; /* stores the onion when state is CONN_STATE_OPEN_WAIT */ uint32_t onionlen; /* total onion length */ uint32_t recvlen; /* length of the onion so far */ void *next; } circuit_t; typedef struct { int zero:1; int version:7; int backf:4; int forwf:4; uint16_t port; uint32_t addr; time_t expire; unsigned char keyseed[16]; } onion_layer_t; typedef struct { time_t expire; char digest[20]; /* SHA digest of the onion */ void *prev; void *next; } tracked_onion_t; typedef struct { char *LogLevel; char *RouterFile; char *PrivateKeyFile; float CoinWeight; int ORPort; int OPPort; int APPort; int MaxConn; int TrafficShaping; } or_options_t; /* all the function prototypes go here */ /********************************* args.c ***************************/ /* print help*/ void print_usage(); /* get command-line arguments */ int getargs(int argc,char *argv[], char *args,char **conf_filename, int *loglevel); /********************************* buffers.c ***************************/ int buf_new(char **buf, size_t *buflen, size_t *buf_datalen); void buf_free(char *buf); int read_to_buf(int s, char **buf, size_t *buflen, size_t *buf_datalen, int *reached_eof); /* grab from s, put onto buf, return how many bytes read */ int flush_buf(int s, char **buf, size_t *buflen, size_t *buf_datalen); /* push from buf onto s * then memmove to front of buf * return -1 or how many bytes remain on the buf */ int write_to_buf(char *string, size_t string_len, char **buf, size_t *buflen, size_t *buf_datalen); /* append string to buf (growing as needed, return -1 if "too big") * return total number of bytes on the buf */ int fetch_from_buf(char *string, size_t string_len, char **buf, size_t *buflen, size_t *buf_datalen); /* if there is string_len bytes in buf, write them onto string, * * then memmove buf back (that is, remove them from buf) */ /********************************* cell.c ***************************/ int check_sane_cell(cell_t *cell); /********************************* circuit.c ***************************/ void circuit_add(circuit_t *circ); void circuit_remove(circuit_t *circ); circuit_t *circuit_new(aci_t p_aci, connection_t *p_conn); /* internal */ aci_t get_unique_aci_by_addr_port(uint32_t addr, uint16_t port, int aci_type); circuit_t *circuit_get_by_aci_conn(aci_t aci, connection_t *conn); circuit_t *circuit_get_by_conn(connection_t *conn); circuit_t *circuit_get_by_naddr_nport(uint32_t naddr, uint16_t nport); int circuit_deliver_data_cell(cell_t *cell, circuit_t *circ, connection_t *conn, int crypt_type); int circuit_crypt(circuit_t *circ, char *in, size_t inlen, char crypt_type); int circuit_init(circuit_t *circ, int aci_type); void circuit_free(circuit_t *circ); void circuit_free_cpath(crypt_path_t **cpath, size_t cpathlen); void circuit_close(circuit_t *circ); void circuit_about_to_close_connection(connection_t *conn); /* flush and send destroys for all circuits using conn */ /********************************* command.c ***************************/ void command_process_cell(cell_t *cell, connection_t *conn); void command_process_create_cell(cell_t *cell, connection_t *conn); void command_process_data_cell(cell_t *cell, connection_t *conn); void command_process_destroy_cell(cell_t *cell, connection_t *conn); /********************************* config.c ***************************/ /* loads the configuration file */ int getconfig(char *filename, config_opt_t *options); /* create or_options_t from command-line args and config files(s) */ int getoptions(int argc, char **argv, or_options_t *options); /********************************* connection.c ***************************/ connection_t *connection_new(int type); void connection_free(connection_t *conn); int connection_create_listener(RSA *prkey, struct sockaddr_in *local, int type); int connection_handle_listener_read(connection_t *conn, int new_type, int new_state); /* start all connections that should be up but aren't */ int retry_all_connections(int role, routerinfo_t **router_array, int rarray_len, RSA *prkey, uint16_t or_port, uint16_t op_port, uint16_t ap_port); connection_t *connection_connect_to_router_as_op(routerinfo_t *router, RSA *prkey, uint16_t local_or_port); int connection_read_to_buf(connection_t *conn); int connection_fetch_from_buf(char *string, int len, connection_t *conn); int connection_flush_buf(connection_t *conn); int connection_write_to_buf(char *string, int len, connection_t *conn); int connection_send_destroy(aci_t aci, connection_t *conn); int connection_encrypt_cell_header(cell_t *cellp, connection_t *conn); int connection_write_cell_to_buf(cell_t *cellp, connection_t *conn); int connection_process_inbuf(connection_t *conn); int connection_package_raw_inbuf(connection_t *conn); int connection_process_cell_from_inbuf(connection_t *conn); int connection_finished_flushing(connection_t *conn); /********************************* connection_ap.c ****************************/ int connection_ap_process_inbuf(connection_t *conn); int ap_handshake_process_ss(connection_t *conn); int ap_handshake_create_onion(connection_t *conn); int ap_handshake_establish_circuit(connection_t *conn, unsigned int *route, int routelen, char *onion, int onionlen, crypt_path_t **cpath); /* find the circ that's waiting on me, if any, and get it to send its onion */ int ap_handshake_n_conn_open(connection_t *or_conn); int ap_handshake_send_onion(connection_t *ap_conn, connection_t *or_conn, circuit_t *circ); int connection_ap_process_data_cell(cell_t *cell, connection_t *conn); int connection_ap_finished_flushing(connection_t *conn); int connection_ap_create_listener(RSA *prkey, struct sockaddr_in *local); int connection_ap_handle_listener_read(connection_t *conn); /********************************* connection_exit.c ***************************/ int connection_exit_process_inbuf(connection_t *conn); int connection_exit_package_inbuf(connection_t *conn); int connection_exit_process_data_cell(cell_t *cell, connection_t *conn); int connection_exit_finished_flushing(connection_t *conn); /********************************* connection_op.c ***************************/ int op_handshake_process_keys(connection_t *conn); int connection_op_process_inbuf(connection_t *conn); int connection_op_finished_flushing(connection_t *conn); int connection_op_create_listener(RSA *prkey, struct sockaddr_in *local); int connection_op_handle_listener_read(connection_t *conn); /********************************* connection_or.c ***************************/ int connection_or_process_inbuf(connection_t *conn); int connection_or_finished_flushing(connection_t *conn); void conn_or_init_crypto(connection_t *conn); int or_handshake_op_send_keys(connection_t *conn); int or_handshake_op_finished_sending_keys(connection_t *conn); int or_handshake_client_process_auth(connection_t *conn); int or_handshake_client_send_auth(connection_t *conn); int or_handshake_server_process_auth(connection_t *conn); int or_handshake_server_process_nonce(connection_t *conn); connection_t *connect_to_router_as_or(routerinfo_t *router, RSA *prkey, struct sockaddr_in *local); connection_t *connection_or_connect_as_or(routerinfo_t *router, RSA *prkey, struct sockaddr_in *local); int connection_or_create_listener(RSA *prkey, struct sockaddr_in *local); int connection_or_handle_listener_read(connection_t *conn); /********************************* main.c ***************************/ int connection_add(connection_t *conn); int connection_remove(connection_t *conn); void connection_set_poll_socket(connection_t *conn); connection_t *connection_get_by_addr_port(uint32_t addr, uint16_t port); connection_t *connection_get_by_type(int type); routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port); unsigned int *router_new_route(size_t *rlen); unsigned char *router_create_onion(unsigned int *route, size_t routelen, size_t *lenp, crypt_path_t **cpathp); routerinfo_t *router_get_first_in_route(unsigned int *route, size_t routelen); connection_t *connect_to_router_as_op(routerinfo_t *router); void connection_watch_events(connection_t *conn, short events); void check_conn_read(int i); void check_conn_marked(int i); void check_conn_write(int i); void check_conn_hup(int i); int do_main_loop(void); int main(int argc, char *argv[]); /********************************* onion.c ***************************/ int decide_aci_type(uint32_t local_addr, uint16_t local_port, uint32_t remote_addr, uint16_t remote_port); int process_onion(circuit_t *circ, connection_t *conn); /* uses a weighted coin with weight cw to choose a route length */ int chooselen(double cw); /* returns an array of pointers to routent that define a new route through the OR network * int cw is the coin weight to use when choosing the route * order of routers is from last to first */ unsigned int *new_route(double cw, routerinfo_t **rarray, size_t rarray_len, size_t *rlen); /* creates a new onion from route, stores it and its length into bufp and lenp respectively */ unsigned char *create_onion(routerinfo_t **rarray, size_t rarray_len, unsigned int *route, size_t routelen, size_t *lenp, crypt_path_t **cpathp); /* encrypts 128 bytes of the onion with the specified public key, the rest with * DES OFB with the key as defined in the outter layer */ unsigned char *encrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *pkey); /* decrypts the first 128 bytes using RSA and prkey, decrypts the rest with DES OFB with key1 */ unsigned char *decrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *prkey); /* delete first n bytes of the onion and pads the end with n bytes of random data */ void pad_onion(unsigned char *onion, uint32_t onionlen, size_t n); /* create a new tracked_onion entry */ tracked_onion_t *new_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion); /* delete a tracked onion entry */ void remove_tracked_onion(tracked_onion_t *to, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion); /* find a tracked onion in the linked list of tracked onions */ tracked_onion_t *id_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t *tracked_onions); /********************************* routers.c ***************************/ routerinfo_t **getrouters(char *routerfile, size_t *listlenp); void delete_routerlist(routerinfo_t *list); /* create an NULL-terminated array of pointers pointing to elements of a router list */ routerinfo_t **make_rarray(routerinfo_t* list, size_t *listlenp); #endif