X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Fconnection.c;h=07885dfdeed9337468593376c381c9a57411580f;hb=20c6108edbd40e08b841683d56dbad049ed11d88;hp=507a18d1c54ad000578f1f5c06344a5336b57b70;hpb=9f104f23e70b190d3b45555b12e540d0788e14e5;p=tlsproxy%2Ftlsproxy.git diff --git a/src/connection.c b/src/connection.c index 507a18d..07885df 100644 --- a/src/connection.c +++ b/src/connection.c @@ -28,6 +28,8 @@ #include #include +#include + /* Maximum length of a HTTP request line. Longer request lines are aborted * with an error. The standard doesn't specify a maximum line length but this @@ -38,7 +40,8 @@ /* Format string used to send HTTP/1.0 error responses to the client. * * %s is used 5 times, first is the error code, then additional headers, next - * two are the error code (no %n$s!), the last is the message. */ + * two are the error code (no %n$s which is not in C98!), the last is the + * message. */ #define HTTP_RESPONSE_FORMAT "HTTP/1.0 %s\r\n\ Content-Type: text/html; charset=US-ASCII\r\n\ %s\r\n\ @@ -84,6 +87,8 @@ 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; @@ -192,7 +197,7 @@ void handle_connection(int client_socket) { /* Check response of proxy server. */ if (strncmp(buffer, "HTTP/1.0 200", 12)) { - LOG(WARNING, "bad proxy response: %s", buffer); + LOG(WARNING, "bad proxy response: >%s<", buffer); send_forwarding_failure(client_fd_write); goto out; } @@ -253,6 +258,10 @@ void handle_connection(int client_socket) { 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!"); @@ -296,6 +305,10 @@ void handle_connection(int client_socket) { 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. */ @@ -337,8 +350,6 @@ out: } if (client_session_init) { gnutls_deinit(client_session); - gnutls_certificate_free_cas(client_x509_cred); - gnutls_certificate_free_keys(client_x509_cred); gnutls_certificate_free_credentials(client_x509_cred); } @@ -685,8 +696,8 @@ static int read_from_write_to(int from, int to) { return -1; } if (size_read != size_written) { - LOG(ERROR, "read_from_write_to(): only written %ld of %ld bytes!", - (long int)size_written, (long int)size_read); + LOG(ERROR, "read_from_write_to(): only written %zu of %zu bytes!", + size_written, size_read); return -1; } @@ -713,8 +724,8 @@ static void transfer_data_tls(int client, int server, 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: %ld", - (long int)buffer_size); + LOG(DEBUG2, "transfer_data_tls(): suggested buffer size: %zu", + buffer_size); for (;;) { int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); @@ -757,11 +768,11 @@ static int read_from_write_to_tls(gnutls_session_t from, size_t buffer_size) { ssize_t size_read; ssize_t size_written; - char buffer[16384]; + char buffer[16384]; /* GnuTLS default maximum */ if (buffer_size > sizeof(buffer)) { - LOG(WARNING, "read_from_write_to_tls(): reduced buffer size to %ld", - (long int)(sizeof(buffer))); + LOG(WARNING, "read_from_write_to_tls(): reduced buffer size to %zu", + sizeof(buffer)); buffer_size = sizeof(buffer); } @@ -782,8 +793,8 @@ static int read_from_write_to_tls(gnutls_session_t from, return -1; } if (size_read != size_written) { - LOG(ERROR, "read_from_write_to_tls(): only written %ld of %ld bytes!", - (long int)size_written, (long int)size_read); + LOG(ERROR, "read_from_write_to_tls(): only written %zu of %zu bytes!", + size_written, size_read); return -1; } @@ -888,3 +899,72 @@ static int parse_request(const char *request, char *host, char *port, 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); +}