module mbedtls import io import net import time const ctr_drbg = C.mbedtls_ctr_drbg_context{} const entropy = C.mbedtls_entropy_context{} fn init() { C.mbedtls_ctr_drbg_init(&mbedtls.ctr_drbg) C.mbedtls_entropy_init(&mbedtls.entropy) ret := C.mbedtls_ctr_drbg_seed(&mbedtls.ctr_drbg, C.mbedtls_entropy_func, &mbedtls.entropy, 0, 0) if ret != 0 { C.mbedtls_ctr_drbg_free(&mbedtls.ctr_drbg) panic('Failed to seed ssl context: $ret') } } struct SSLCerts { cacert C.mbedtls_x509_crt client_cert C.mbedtls_x509_crt client_key C.mbedtls_pk_context } // SSLConn is the current connection pub struct SSLConn { config SSLConnectConfig mut: server_fd C.mbedtls_net_context ssl C.mbedtls_ssl_context conf C.mbedtls_ssl_config certs &SSLCerts = unsafe { nil } handle int duration time.Duration opened bool } [params] pub struct SSLConnectConfig { verify string // the path to a rootca.pem file, containing trusted CA certificate(s) cert string // the path to a cert.pem file, containing client certificate(s) for the request cert_key string // the path to a key.pem file, containing private keys for the client certificate(s) validate bool // set this to true, if you want to stop requests, when their certificates are found to be invalid in_memory_verification bool // if true, verify, cert, and cert_key are read from memory, not from a file } // new_ssl_conn returns a new SSLConn with the given config. pub fn new_ssl_conn(config SSLConnectConfig) ?&SSLConn { mut conn := &SSLConn{ config: config } conn.init() or { return err } return conn } // Select operation enum Select { read write except } // shutdown terminates the ssl connection and does cleanup pub fn (mut s SSLConn) shutdown() ? { if !s.opened { return error('ssl connection not open') } if unsafe { s.certs != nil } { C.mbedtls_x509_crt_free(&s.certs.cacert) C.mbedtls_x509_crt_free(&s.certs.client_cert) C.mbedtls_pk_free(&s.certs.client_key) } C.mbedtls_ssl_free(&s.ssl) C.mbedtls_ssl_config_free(&s.conf) } // connect to server using mbedtls fn (mut s SSLConn) init() ? { C.mbedtls_net_init(&s.server_fd) C.mbedtls_ssl_init(&s.ssl) C.mbedtls_ssl_config_init(&s.conf) mut ret := 0 ret = C.mbedtls_ssl_config_defaults(&s.conf, C.MBEDTLS_SSL_IS_CLIENT, C.MBEDTLS_SSL_TRANSPORT_STREAM, C.MBEDTLS_SSL_PRESET_DEFAULT) if ret != 0 { return error_with_code('Failed to set SSL configuration', ret) } C.mbedtls_ssl_conf_rng(&s.conf, C.mbedtls_ctr_drbg_random, &mbedtls.ctr_drbg) if s.config.verify != '' || s.config.cert != '' || s.config.cert_key != '' { s.certs = &SSLCerts{} C.mbedtls_x509_crt_init(&s.certs.cacert) C.mbedtls_x509_crt_init(&s.certs.client_cert) C.mbedtls_pk_init(&s.certs.client_key) } if s.config.in_memory_verification { if s.config.verify != '' { ret = C.mbedtls_x509_crt_parse(&s.certs.cacert, s.config.verify.str, s.config.verify.len) } if s.config.cert != '' { ret = C.mbedtls_x509_crt_parse(&s.certs.client_cert, s.config.cert.str, s.config.cert.len) } if s.config.cert_key != '' { ret = C.mbedtls_pk_parse_key(&s.certs.client_key, s.config.cert_key.str, s.config.cert_key.len, 0, 0, C.mbedtls_ctr_drbg_random, &mbedtls.ctr_drbg) } } else { if s.config.verify != '' { ret = C.mbedtls_x509_crt_parse_file(&s.certs.cacert, &char(s.config.verify.str)) } if s.config.cert != '' { ret = C.mbedtls_x509_crt_parse_file(&s.certs.client_cert, &char(s.config.cert.str)) } if s.config.cert_key != '' { ret = C.mbedtls_pk_parse_keyfile(&s.certs.client_key, &char(s.config.cert_key.str), 0, C.mbedtls_ctr_drbg_random, &mbedtls.ctr_drbg) } } if ret < 0 { return error_with_code('Failed to set certificates', ret) } if unsafe { s.certs != nil } { C.mbedtls_ssl_conf_ca_chain(&s.conf, &s.certs.cacert, 0) C.mbedtls_ssl_conf_own_cert(&s.conf, &s.certs.client_cert, &s.certs.client_key) } if s.config.validate { C.mbedtls_ssl_conf_authmode(&s.conf, C.MBEDTLS_SSL_VERIFY_REQUIRED) } else { C.mbedtls_ssl_conf_authmode(&s.conf, C.MBEDTLS_SSL_VERIFY_OPTIONAL) } ret = C.mbedtls_ssl_setup(&s.ssl, &s.conf) if ret != 0 { return error_with_code('Failed to setup SSL connection', ret) } } // connect sets up an ssl connection on an existing TCP connection pub fn (mut s SSLConn) connect(mut tcp_conn net.TcpConn, hostname string) ? { if s.opened { return error('ssl connection already open') } s.handle = tcp_conn.sock.handle s.duration = 30 * time.second mut ret := C.mbedtls_ssl_set_hostname(&s.ssl, &char(hostname.str)) if ret != 0 { return error_with_code('Failed to set hostname', ret) } s.server_fd.fd = s.handle C.mbedtls_ssl_set_bio(&s.ssl, &s.server_fd, C.mbedtls_net_send, C.mbedtls_net_recv, C.mbedtls_net_recv_timeout) ret = C.mbedtls_ssl_handshake(&s.ssl) if ret != 0 { return error_with_code('SSL handshake failed', ret) } s.opened = true } // dial opens an ssl connection on hostname:port pub fn (mut s SSLConn) dial(hostname string, port int) ? { if s.opened { return error('ssl connection already open') } s.duration = 30 * time.second mut ret := C.mbedtls_ssl_set_hostname(&s.ssl, &char(hostname.str)) if ret != 0 { return error_with_code('Failed to set hostname', ret) } port_str := port.str() ret = C.mbedtls_net_connect(&s.server_fd, &char(hostname.str), &char(port_str.str), C.MBEDTLS_NET_PROTO_TCP) if ret != 0 { return error_with_code('Failed to connect to host', ret) } C.mbedtls_ssl_set_bio(&s.ssl, &s.server_fd, C.mbedtls_net_send, C.mbedtls_net_recv, C.mbedtls_net_recv_timeout) s.handle = s.server_fd.fd ret = C.mbedtls_ssl_handshake(&s.ssl) if ret != 0 { return error_with_code('SSL handshake failed', ret) } s.opened = true } // socket_read_into_ptr reads `len` bytes into `buf` pub fn (mut s SSLConn) socket_read_into_ptr(buf_ptr &u8, len int) ?int { mut res := 0 for { res = C.mbedtls_ssl_read(&s.ssl, buf_ptr, len) if res > 0 { return res } else if res == 0 { return IError(io.Eof{}) } else { match res { C.MBEDTLS_ERR_SSL_WANT_READ { ready := @select(s.handle, .read, s.duration)? if !ready { return net.err_timed_out } } C.MBEDTLS_ERR_SSL_WANT_WRITE { ready := @select(s.handle, .write, s.duration)? if !ready { return net.err_timed_out } } C.MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY { break } else { return error_with_code('Could not read using SSL', res) } } } } return res } // read reads data from the ssl connection into `buffer` pub fn (mut s SSLConn) read(mut buffer []u8) !int { res := s.socket_read_into_ptr(&u8(buffer.data), buffer.len) or { return err } return res } // write_ptr writes `len` bytes from `bytes` to the ssl connection pub fn (mut s SSLConn) write_ptr(bytes &u8, len int) ?int { unsafe { mut ptr_base := bytes mut total_sent := 0 for total_sent < len { ptr := ptr_base + total_sent remaining := len - total_sent mut sent := C.mbedtls_ssl_write(&s.ssl, ptr, remaining) if sent <= 0 { match sent { C.MBEDTLS_ERR_SSL_WANT_READ { for { ready := @select(s.handle, .read, s.duration)? if ready { break } } continue } C.MBEDTLS_ERR_SSL_WANT_WRITE { for { ready := @select(s.handle, .write, s.duration)? if ready { break } } continue } else { return error_with_code('Could not write using SSL', sent) } } } total_sent += sent } return total_sent } } // write writes data from `bytes` to the ssl connection pub fn (mut s SSLConn) write(bytes []u8) ?int { return s.write_ptr(&u8(bytes.data), bytes.len) } // write_string writes a string to the ssl connection pub fn (mut s SSLConn) write_string(str string) ?int { return s.write_ptr(str.str, str.len) } /* This is basically a copy of Emily socket implementation of select. This have to be consolidated into common net lib features when merging this to V */ // Select waits for an io operation (specified by parameter `test`) to be available fn @select(handle int, test Select, timeout time.Duration) ?bool { set := C.fd_set{} C.FD_ZERO(&set) C.FD_SET(handle, &set) seconds := timeout.milliseconds() / 1000 microseconds := timeout - (seconds * time.second) mut tt := C.timeval{ tv_sec: u64(seconds) tv_usec: u64(microseconds) } mut timeval_timeout := &tt // infinite timeout is signaled by passing null as the timeout to // select if timeout == net.infinite_timeout { timeval_timeout = &C.timeval(0) } match test { .read { net.socket_error(C.@select(handle + 1, &set, C.NULL, C.NULL, timeval_timeout))? } .write { net.socket_error(C.@select(handle + 1, C.NULL, &set, C.NULL, timeval_timeout))? } .except { net.socket_error(C.@select(handle + 1, C.NULL, C.NULL, &set, timeval_timeout))? } } return C.FD_ISSET(handle, &set) }