%s
\n\ \n\ \n" static int initialize_tls_session_client(int peer_socket, const char *hostname, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred); static int initialize_tls_session_server(int peer_socket, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred); static int initialize_tls_session_both(unsigned int flags, int peer_socket, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred); static int fdopen_read_write(int socket, FILE **read_fd, FILE **write_fd); static int read_http_request(FILE *client_fd, char *request, size_t length); static void send_bad_request(FILE *client_fd); static void send_authentication_required(FILE *client_fd); static void send_forwarding_failure(FILE *client_fd); static void tls_send_invalid_cert_message(gnutls_session_t session); static void transfer_data(int client, int server); static int read_from_write_to(int from, int to); static void transfer_data_tls(int client, int server, gnutls_session_t client_session, gnutls_session_t server_session); static int read_from_write_to_tls(gnutls_session_t from, gnutls_session_t to, size_t buffer_size); static int connect_to_host(const char *hostname, const char *port); static int parse_request(const char *buffer, char *host, char *port, int *version_minor); static void log_session_information(gnutls_session_t session); void handle_connection(int client_socket) { int server_socket; FILE *client_fd_read, *client_fd_write, *server_fd_read, *server_fd_write; char buffer[MAX_REQUEST_LINE]; char host[MAX_REQUEST_LINE]; char port[5 + 1]; int version_minor; /* x in HTTP/1.x */ int result; /* client_x509_cred is used when talking to the client (acting as a TLS * server), server_x509_cred is used when talking to the server (acting as * a TLS client). */ gnutls_certificate_credentials_t client_x509_cred, server_x509_cred; gnutls_session_t client_session, server_session; /* initialize_tls_session_*() called? - used for goto out */ int client_session_init, server_session_init; /* gnutls_handshake() called? - used for goto out */ int client_session_started, server_session_started; /* Validation failed? If yes we need to send the special "invalid" * certificate. */ int validation_failed; LOG(DEBUG1, "new connection"); server_socket = -1; client_fd_read = NULL; client_fd_write = NULL; server_fd_read = NULL; server_fd_write = NULL; client_session_init = 0; server_session_init = 0; client_session_started = 0; server_session_started = 0; validation_failed = 0; if (fdopen_read_write(client_socket, &client_fd_read, &client_fd_write) != 0) { goto out; } /* Read request line (CONNECT ..) and headers (they are discarded). */ result = read_http_request(client_fd_read, buffer, sizeof(buffer)); if (result == -1) { LOG(WARNING, "read_http_request(): client read error"); goto out; } else if (result == -2) { LOG(WARNING, "read_http_request(): client EOF"); send_bad_request(client_fd_write); goto out; } else if (result == -3) { LOG(WARNING, "read_http_request(): proxy authentication failed"); send_authentication_required(client_fd_write); goto out; } if (parse_request(buffer, host, port, &version_minor) != 0) { LOG(WARNING, "bad request: >%s<", buffer); send_bad_request(client_fd_write); goto out; } LOG(DEBUG2, "target: %s:%s (HTTP 1.%d)", host, port, version_minor); /* Connect to proxy server or directly to server. */ if (global_proxy_host != NULL && global_proxy_port != NULL) { LOG(DEBUG1, "connecting to %s:%s", global_proxy_host, global_proxy_port); server_socket = connect_to_host(global_proxy_host, global_proxy_port); } else { LOG(DEBUG1, "connecting to %s:%s", host, port); server_socket = connect_to_host(host, port); } if (server_socket < 0) { LOG(WARNING, "failed to connect to server"); send_forwarding_failure(client_fd_write); goto out; } if (fdopen_read_write(server_socket, &server_fd_read, &server_fd_write) != 0) { send_forwarding_failure(client_fd_write); goto out; } /* Connect to proxy if requested (command line option). */ if (global_proxy_host != NULL && global_proxy_port != NULL) { fprintf(server_fd_write, "CONNECT %s:%s HTTP/1.0\r\n", host, port); fprintf(server_fd_write, "\r\n"); fflush(server_fd_write); /* Read response line from proxy server. */ result = read_http_request(server_fd_read, buffer, sizeof(buffer)); if (result == -1) { LOG(WARNING, "read_http_request(): proxy read error"); send_forwarding_failure(client_fd_write); goto out; } else if (result == -2) { LOG(WARNING, "read_http_request(): proxy EOF"); send_forwarding_failure(client_fd_write); goto out; } /* Check response of proxy server. */ if (strncmp(buffer, "HTTP/1.0 200", 12)) { LOG(WARNING, "bad proxy response: >%s<", buffer); send_forwarding_failure(client_fd_write); goto out; } } LOG(DEBUG1, "connection to server established"); /* If the -u option is used and we don't know this hostname's server * certificate, then just pass through the connection and let the client * verify the server certificate. */ if (global_passthrough_unknown) { char path[TLSPROXY_MAX_PATH_LENGTH]; FILE *file = NULL; if (server_certificate_file(&file, host, path, sizeof(path)) == -2) { /* We've established a connection, tell the client. */ fprintf(client_fd_write, "HTTP/1.0 200 Connection established\r\n"); fprintf(client_fd_write, "\r\n"); fflush(client_fd_write); LOG(DEBUG1, "transferring data"); /* Proxy data between client and server until one side is done * (EOF or error). */ transfer_data(client_socket, server_socket); LOG(DEBUG1, "finished transferring data"); goto out; } /* server_certificate_file() may have opened the file, close it. */ if (file != NULL) { fclose(file); } } /* Initialize TLS client credentials to talk to the server. */ result = initialize_tls_session_server(server_socket, &server_session, &server_x509_cred); if (result != 0) { LOG(WARNING, "initialize_tls_session_server() failed"); send_forwarding_failure(client_fd_write); goto out; } server_session_init = 1; LOG(DEBUG1, "starting server TLS handshake"); /* Try to establish TLS handshake between us and server. */ result = gnutls_handshake(server_session); if (result != GNUTLS_E_SUCCESS) { LOG(WARNING, "server TLS handshake failed: %s", gnutls_strerror(result)); send_forwarding_failure(client_fd_write); goto out; } server_session_started = 1; LOG(DEBUG1, "server TLS handshake finished"); if (global_log_level >= LOG_DEBUG2_LEVEL) { log_session_information(server_session); } /* Make sure the server certificate is valid and known. */ if (verify_tls_connection(server_session, host) != 0) { LOG(ERROR, "server certificate validation failed!"); /* We'll send the error message over our TLS connection to the client, * but with an invalid certificate. No data is transfered from/to the * target server. */ validation_failed = 1; } /* Initialize TLS server credentials to talk to the client. */ result = initialize_tls_session_client(client_socket, /* use a special host if the server * certificate was invalid */ (validation_failed) ? "invalid" : host, &client_session, &client_x509_cred); if (result != 0) { LOG(WARNING, "initialize_tls_session_client() failed"); send_forwarding_failure(client_fd_write); goto out; } client_session_init = 1; /* We've established a connection, tell the client. */ fprintf(client_fd_write, "HTTP/1.0 200 Connection established\r\n"); fprintf(client_fd_write, "\r\n"); fflush(client_fd_write); LOG(DEBUG1, "starting client TLS handshake"); /* Try to establish TLS handshake between client and us. */ result = gnutls_handshake(client_session); if (result != GNUTLS_E_SUCCESS) { LOG(WARNING, "client TLS handshake failed: %s", gnutls_strerror(result)); send_forwarding_failure(client_fd_write); goto out; } client_session_started = 1; LOG(DEBUG1, "client TLS handshake finished"); if (global_log_level >= LOG_DEBUG2_LEVEL) { log_session_information(client_session); } /* Tell the client that the verification failed. Shouldn't be necessary as * the client should terminate the connection because he received the * invalid certificate but better be sure. */ if (validation_failed) { tls_send_invalid_cert_message(client_session); goto out; } LOG(DEBUG1, "transferring TLS data"); /* Proxy data between client and server until one side is done (EOF or * error). */ transfer_data_tls(client_socket, server_socket, client_session, server_session); LOG(DEBUG1, "finished transferring TLS data"); out: /* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is * reliable transmitted. */ if (server_session_started) { /* Recent gnutls-serv (used in the test-suite) won't terminate the * connection when gnutls_bye(session, GNUTLS_SHUT_RDWR) is used * before any other data was received. If the validation failed just * close the connection without waiting for data, we won't read it * anyway. * * For verified connections GNUTLS_SHUT_RDWR is important or we might * lose data. */ gnutls_bye(server_session, validation_failed ? GNUTLS_SHUT_WR : GNUTLS_SHUT_RDWR); } if (client_session_started) { gnutls_bye(client_session, GNUTLS_SHUT_RDWR); } if (server_session_init) { gnutls_deinit(server_session); gnutls_certificate_free_credentials(server_x509_cred); } if (client_session_init) { gnutls_deinit(client_session); gnutls_certificate_free_credentials(client_x509_cred); } /* Close connection to server/proxy. */ if (server_fd_read != NULL) { if (server_fd_write != NULL) { fclose(server_fd_write); } fclose(server_fd_read); } else if (server_socket != -1) { close(server_socket); } LOG(DEBUG1, "connection to server closed"); /* Close connection to client. */ if (client_fd_read != NULL) { if (client_fd_write != NULL) { fclose(client_fd_write); } fclose(client_fd_read); } else { close(client_socket); } LOG(DEBUG1, "connection to client closed"); LOG(DEBUG1, "connection finished"); } static int initialize_tls_session_client(int peer_socket, const char *hostname, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred) { int result; int use_invalid_cert; char path[TLSPROXY_MAX_PATH_LENGTH]; /* The "invalid" hostname is special. If it's used we send an invalid * certificate to let the client know something is wrong. */ use_invalid_cert = (!strcmp(hostname, "invalid")); if (proxy_certificate_path(hostname, path, sizeof(path)) != 0) { LOG(ERROR, "initialize_tls_session_client(): " "failed to get proxy certificate path"); return -1; } result = gnutls_certificate_allocate_credentials(x509_cred); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_client(): " "gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); return -1; } /* Load proxy CA file, this CA "list" is send to the client. */ if (!use_invalid_cert) { result = gnutls_certificate_set_x509_trust_file(*x509_cred, PROXY_CA_PATH, GNUTLS_X509_FMT_PEM); if (result <= 0) { LOG(ERROR, "initialize_tls_session_client(): can't read CA file: '%s'", PROXY_CA_PATH); gnutls_certificate_free_credentials(*x509_cred); return -1; } else if (result != 1) { /* Must contain only one CA, our proxy CA. */ LOG(ERROR, "initialize_tls_session_client(): multiple CAs found"); gnutls_certificate_free_credentials(*x509_cred); return -1; } } /* If the invalid hostname was specified do nothing, we use a self-signed * certificate in this case. */ /* And certificate for this website and proxy's private key. */ if (!use_invalid_cert) { result = gnutls_certificate_set_x509_key_file(*x509_cred, path, PROXY_KEY_PATH, GNUTLS_X509_FMT_PEM); /* If the invalid hostname was specified load our special "invalid" * certificate. */ } else { result = gnutls_certificate_set_x509_key_file(*x509_cred, PROXY_INVALID_CERT_PATH, PROXY_KEY_PATH, GNUTLS_X509_FMT_PEM); } if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_client(): " "can't read server certificate ('%s') or key file ('%s'): %s", path, PROXY_KEY_PATH, gnutls_strerror(result)); gnutls_certificate_free_credentials(*x509_cred); /* Could be a missing certificate. */ return -2; } gnutls_certificate_set_dh_params(*x509_cred, global_tls_dh_params); return initialize_tls_session_both(GNUTLS_SERVER, peer_socket, session, x509_cred); } static int initialize_tls_session_server(int peer_socket, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred) { int result; result = gnutls_certificate_allocate_credentials(x509_cred); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_server(): " "gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); return -1; } return initialize_tls_session_both(GNUTLS_CLIENT, peer_socket, session, x509_cred); } static int initialize_tls_session_both(unsigned int flags, int peer_socket, gnutls_session_t *session, gnutls_certificate_credentials_t *x509_cred) { int result; *session = NULL; result = gnutls_init(session, flags); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_both(): gnutls_init(): %s", gnutls_strerror(result)); goto err; } result = gnutls_priority_set(*session, global_tls_priority_cache); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_both(): gnutls_priority_set(): %s", gnutls_strerror(result)); goto err; } result = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, *x509_cred); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, "initialize_tls_session_both(): gnutls_credentials_set(): %s", gnutls_strerror(result)); goto err; } #ifdef HAVE_GNUTLS_TRANSPORT_SET_INT2 /* gnutls_transport_set_int() is a macro. */ gnutls_transport_set_int(*session, peer_socket); #else gnutls_transport_set_ptr(*session, (gnutls_transport_ptr_t)peer_socket); #endif return 0; err: if (*session) { gnutls_deinit(*session); } gnutls_certificate_free_credentials(*x509_cred); return -1; } static int fdopen_read_write(int socket, FILE **read_fd, FILE **write_fd) { *read_fd = fdopen(socket, "r"); if (*read_fd == NULL) { LOG_PERROR(WARNING, "fdopen_read_write(): fdopen(\"r\") failed"); return -1; } *write_fd = fdopen(dup(socket), "w"); if (*write_fd == NULL) { LOG_PERROR(WARNING, "fdopen_read_write(): fdopen(\"w\") failed"); fclose(*read_fd); *read_fd = NULL; /* "tell" caller read_fd is already closed */ return -1; } return 0; } /* Read HTTP request line and headers (ignored). * * On success 0 is returned, -1 on client error, -2 on unexpected EOF. */ static int read_http_request(FILE *client_fd, char *request, size_t length) { char buffer[MAX_REQUEST_LINE]; int found_proxy_authorization; assert(length <= INT_MAX); if (fgets(request, (int)length, client_fd) == NULL) { if (ferror(client_fd)) { LOG_PERROR(WARNING, "read_http_request(): fgets()"); return -1; } /* EOF */ return -2; } found_proxy_authorization = 0; while (fgets(buffer, sizeof(buffer), client_fd) != NULL) { const char *authentication = "Proxy-Authorization: Basic "; if (global_http_digest_authorization != NULL && !strncmp(buffer, authentication, strlen(authentication))) { found_proxy_authorization = 1; /* Check if the passphrase matches. */ strtok(buffer, "\r\n"); if (strcmp(buffer + strlen(authentication), global_http_digest_authorization)) { return -3; } } /* End of header. */ if (!strcmp(buffer, "\n") || !strcmp(buffer, "\r\n")) { break; } } if (ferror(client_fd)) { LOG_PERROR(WARNING, "read_http_request(): fgets()"); return -1; } else if (feof(client_fd)) { return -2; } if (global_http_digest_authorization != NULL && !found_proxy_authorization) { return -3; } return 0; } static void send_bad_request(FILE *client_fd) { const char error[] = "400 Bad Request"; const char msg[] = "Your browser sent an invalid request."; fprintf(client_fd, HTTP_RESPONSE_FORMAT, error, "", error, error, msg); fflush(client_fd); } static void send_authentication_required(FILE *client_fd) { const char error[] = "407 Proxy Authentication Required"; const char auth[] = "Proxy-Authenticate: Basic realm=\"tlsproxy\"\r\n"; const char msg[] = "TODO"; fprintf(client_fd, HTTP_RESPONSE_FORMAT, error, auth, error, error, msg); fflush(client_fd); } static void send_forwarding_failure(FILE *client_fd) { const char error[] = "503 Forwarding failure"; const char msg[] = "Failed to connect to server, check logs."; fprintf(client_fd, HTTP_RESPONSE_FORMAT, error, "", error, error, msg); fflush(client_fd); } static void tls_send_invalid_cert_message(gnutls_session_t session) { const char error[] = "500 Internal Server Error"; const char msg[] = "Server certificate validation failed, check logs."; int result; ssize_t size_written; char buffer[sizeof(HTTP_RESPONSE_FORMAT) + 3 * sizeof(error) + sizeof(msg)]; result = snprintf(buffer, sizeof(buffer), HTTP_RESPONSE_FORMAT, error, "", error, error, msg); assert(result > 0 && (size_t)result < sizeof(buffer)); size_written = gnutls_record_send(session, buffer, strlen(buffer)); if (size_written < 0) { LOG(WARNING, "tls_send_invalid_cert_message(): " "gnutls_record_send(): %s", gnutls_strerror((int)size_written)); } /* Just an error message, no need to check if everything was written. */ } /* Transfer data between client and server sockets until one closes the * connection. */ static void transfer_data(int client, int server) { struct pollfd fds[2]; fds[0].fd = client; fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR; fds[0].revents = 0; fds[1].fd = server; fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR; fds[1].revents = 0; LOG(DEBUG2, "transfer_data(): %d -> %d", client, server); for (;;) { int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); if (result < 0) { LOG_PERROR(ERROR, "transfer_data(): poll()"); return; } /* Data available from client. */ if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { if (read_from_write_to(client, server) != 0) { /* EOF (or other error) */ break; } } /* Data available from server. */ if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) { if (read_from_write_to(server, client) != 0) { /* EOF (or other error) */ break; } } /* Client closed connection. */ if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) { break; } /* Server closed connection. */ if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) { break; } } } /* Read available data from socket from and write it to socket to. At maximum * 4096 bytes are read/written. */ static int read_from_write_to(int from, int to) { ssize_t size_read; ssize_t size_written; char buffer[4096]; size_read = read(from, buffer, sizeof(buffer)); if (size_read < 0) { LOG_PERROR(WARNING, "read_from_write_to(): read()"); return -1; /* EOF */ } else if (size_read == 0) { return -1; } size_written = write(to, buffer, (size_t)size_read); if (size_written < 0) { LOG_PERROR(WARNING, "read_from_write_to(): write()"); return -1; } if (size_read != size_written) { LOG(ERROR, "read_from_write_to(): only written %zu of %zu bytes!", size_written, size_read); return -1; } return 0; } /* Transfer data between client and server TLS connection until one closes the * connection. */ static void transfer_data_tls(int client, int server, gnutls_session_t client_session, gnutls_session_t server_session) { size_t buffer_size; struct pollfd fds[2]; fds[0].fd = client; fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR; fds[0].revents = 0; fds[1].fd = server; fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR; fds[1].revents = 0; /* Get maximum possible buffer size. */ buffer_size = gnutls_record_get_max_size(client_session); if (gnutls_record_get_max_size(server_session) < buffer_size) { buffer_size = gnutls_record_get_max_size(server_session); } LOG(DEBUG2, "transfer_data_tls(): suggested buffer size: %zu", buffer_size); for (;;) { int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); if (result < 0) { LOG_PERROR(ERROR, "transfer_data(): poll()"); return; } /* Data available from client. */ if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { if (read_from_write_to_tls(client_session, server_session, buffer_size) != 0) { /* EOF (or other error) */ break; } } /* Data available from server. */ if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) { if (read_from_write_to_tls(server_session, client_session, buffer_size) != 0) { /* EOF (or other error) */ break; } } /* Client closed connection. */ if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) { break; } /* Server closed connection. */ if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) { break; } } } /* Read available data from session from and write to session to. */ static int read_from_write_to_tls(gnutls_session_t from, gnutls_session_t to, size_t buffer_size) { ssize_t size_read; ssize_t size_written; char buffer[16384]; /* GnuTLS default maximum */ if (buffer_size > sizeof(buffer)) { LOG(WARNING, "read_from_write_to_tls(): reduced buffer size to %zu", sizeof(buffer)); buffer_size = sizeof(buffer); } size_read = gnutls_record_recv(from, buffer, buffer_size); if (size_read < 0) { /* Allow rehandshakes. As handshakes might be insecure make sure that * %SAFE_RENEGOTIATION is used in GnuTLS's priority string. */ if (size_read == GNUTLS_E_REHANDSHAKE) { int result; LOG(DEBUG1, "server requested TLS rehandshake"); result = gnutls_handshake(from); if (result != GNUTLS_E_SUCCESS) { LOG(WARNING, "server TLS rehandshake failed: %s", gnutls_strerror(result)); return -1; } return 0; } LOG(WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s", gnutls_strerror((int)size_read)); return -1; /* EOF */ } else if (size_read == 0) { return -1; } size_written = gnutls_record_send(to, buffer, (size_t)size_read); if (size_written < 0) { LOG(WARNING, "read_from_write_to_tls(): gnutls_record_send(): %s", gnutls_strerror((int)size_written)); return -1; } if (size_read != size_written) { LOG(ERROR, "read_from_write_to_tls(): only written %zu of %zu bytes!", size_written, size_read); return -1; } return 0; } static int connect_to_host(const char *hostname, const char *port) { struct addrinfo gai_hints; struct addrinfo *gai_result; int gai_return; int server_socket; struct addrinfo *server; if (hostname == NULL || port == NULL) { return -1; } /* Get IP of hostname server. */ memset(&gai_hints, 0, sizeof(gai_hints)); gai_hints.ai_family = AF_UNSPEC; gai_hints.ai_socktype = SOCK_STREAM; gai_hints.ai_protocol = 0; gai_hints.ai_flags = AI_NUMERICSERV /* given port is numeric */ #ifdef AI_ADDRCONFIG | AI_ADDRCONFIG /* supported by this computer */ #endif ; gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result); if (gai_return != 0) { if (gai_return == EAI_SYSTEM) { LOG_PERROR(WARNING, "connect_to_host(): getaddrinfo()"); } else { LOG(WARNING, "connect_to_host(): getaddrinfo(): %s", gai_strerror(gai_return)); } return -1; } /* Now try to connect to each server returned by getaddrinfo(), use the * first successful connect. */ for (server = gai_result; server != NULL; server = server->ai_next) { server_socket = socket(server->ai_family, server->ai_socktype, server->ai_protocol); if (server_socket < 0) { LOG_PERROR(DEBUG1, "connect_to_host(): socket(), trying next"); continue; } if (connect(server_socket, server->ai_addr, server->ai_addrlen) == 0) { break; } LOG_PERROR(DEBUG1, "connect_to_host(): connect(), trying next"); close(server_socket); } /* Make sure we free the result from getaddrinfo(). */ freeaddrinfo(gai_result); if (server == NULL) { LOG_PERROR(WARNING, "connect_to_host(): no server found, abort"); return -1; } return server_socket; } /* Parse HTTP CONNECT request string and save its parameters. * * The following format is expected: "CONNECT host:port HTTP/1.x". * * request and host must have the same size! port must be at least 6 bytes * long (5 + '\0'). */ static int parse_request(const char *request, char *host, char *port, int *version_minor) { int port_unused; /* just used to verify the port is numeric */ char *position; /* scanf() doesn't check spaces. */ if (strncmp(request, "CONNECT ", 8)) { return -1; } /* Check request and extract data, "host:port" is not yet separated. */ if (sscanf(request, "CONNECT %s HTTP/1.%d", host, version_minor) != 2) { return -1; } /* Make sure ":port" is there. */ if ((position = strchr(host, ':')) == NULL) { return -1; } /* Make sure port is numeric. */ if (sscanf(position + 1, "%d", &port_unused) != 1) { return -1; } /* Store it in *port. */ strncpy(port, position + 1, 5); port[5] = '\0'; /* And remove port from host. */ *position = '\0'; return 0; } static void log_session_information(gnutls_session_t session) { /* From doc/examples/ex-session-info.c of GnuTLS 3.2.3's tarball and * modified, thanks. */ const char *tmp; gnutls_credentials_type_t cred; gnutls_kx_algorithm_t kx; int dhe, ecdh; dhe = 0; ecdh = 0; /* Key exchange algorithm. */ kx = gnutls_kx_get(session); LOG(DEBUG2, "- key exchange: %s", gnutls_kx_get_name(kx)); /* Authentication type. */ cred = gnutls_auth_get_type(session); switch (cred) { case GNUTLS_CRD_CERTIFICATE: if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS) { dhe = 1; #ifdef GNUTLS_KX_ECDHE_RSA } else if (kx == GNUTLS_KX_ECDHE_RSA || kx == GNUTLS_KX_ECDHE_ECDSA) { ecdh = 1; #endif } break; case GNUTLS_CRD_IA: case GNUTLS_CRD_SRP: case GNUTLS_CRD_PSK: case GNUTLS_CRD_ANON: default: /* This shouldn't occur. */ LOG(WARNING, "unexpected authentication method: %d", cred); break; } /* Information about key exchange. */ if (dhe) { LOG(DEBUG2, "- ephemeral DH using prime of %d bits", gnutls_dh_get_prime_bits(session)); } else if (ecdh) { #ifdef GNUTLS_KX_ECDHE_RSA LOG(DEBUG2, "- ephemeral ECDH using curve %s", gnutls_ecc_curve_get_name(gnutls_ecc_curve_get(session))); #endif } tmp = gnutls_protocol_get_name(gnutls_protocol_get_version(session)); LOG(DEBUG2, "- protocol: %s", tmp); /* e.g. TLS 1.0 */ tmp = gnutls_certificate_type_get_name(gnutls_certificate_type_get(session)); LOG(DEBUG2, "- certificate type: %s", tmp); tmp = gnutls_compression_get_name(gnutls_compression_get(session)); LOG(DEBUG2, "- compression: %s", tmp); tmp = gnutls_cipher_get_name(gnutls_cipher_get(session)); LOG(DEBUG2, "- cipher: %s", tmp); tmp = gnutls_mac_get_name(gnutls_mac_get(session)); LOG(DEBUG2, "- MAC: %s", tmp); }