X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Fconnection.c;h=7f2071a7975340737e68acdd06237ae759e4d5ca;hb=8b2ed4a58229f9b377f3a4ae74af36c31c5db1c0;hp=f608339f8014ba0427f515c36a14f1d29a51e894;hpb=1d507eaf013fdffb6c17f0f02f6ee9a91d44aa62;p=tlsproxy%2Ftlsproxy.git diff --git a/src/connection.c b/src/connection.c index f608339..7f2071a 100644 --- a/src/connection.c +++ b/src/connection.c @@ -58,6 +58,7 @@ static int initialize_tls_session_server(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_forwarding_failure(FILE *client_fd); @@ -79,13 +80,13 @@ static int parse_request(const char *buffer, char *host, char *port, void handle_connection(int client_socket) { int server_socket; - FILE *client_fd, *server_fd; + 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; /* HTTP/1.x */ + int version_minor; /* x in HTTP/1.x */ int result; /* client_x509_cred is used when talking to the client (acting as a TSL @@ -102,94 +103,91 @@ void handle_connection(int client_socket) { * certificate. */ int validation_failed; - LOG(LOG_DEBUG, "new connection"); + LOG(DEBUG, "new connection"); server_socket = -1; - client_fd = NULL; - server_fd = NULL; + 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; - client_fd = fdopen(client_socket, "a+"); - if (client_fd == NULL) { - LOG_PERROR(LOG_WARNING, "fdopen(): client failed"); + 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, buffer, sizeof(buffer)); + result = read_http_request(client_fd_read, buffer, sizeof(buffer)); if (result == -1) { - /* Read error. */ - LOG(LOG_WARNING, "read_http_request(): client read error"); + LOG(WARNING, "read_http_request(): client read error"); goto out; } else if (result == -2) { - /* EOF */ - LOG(LOG_WARNING, "read_http_request(): client EOF"); - send_bad_request(client_fd); + LOG(WARNING, "read_http_request(): client EOF"); + send_bad_request(client_fd_write); goto out; } if (parse_request(buffer, host, port, &version_minor) != 0) { - LOG(LOG_WARNING, "bad request: %s", buffer); - send_bad_request(client_fd); + LOG(WARNING, "bad request: %s", buffer); + send_bad_request(client_fd_write); goto out; } - LOG(LOG_DEBUG, "target: %s:%s (HTTP 1.%d)", host, port, version_minor); + LOG(DEBUG, "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(LOG_DEBUG, "connecting to %s:%s", global_proxy_host, + LOG(DEBUG, "connecting to %s:%s", global_proxy_host, global_proxy_port); server_socket = connect_to_host(global_proxy_host, global_proxy_port); } else { - LOG(LOG_DEBUG, "connecting to %s:%s", host, port); + LOG(DEBUG, "connecting to %s:%s", host, port); server_socket = connect_to_host(host, port); } if (server_socket == -1) { - LOG(LOG_WARNING, "failed to connect to server"); - send_forwarding_failure(client_fd); + LOG(WARNING, "failed to connect to server"); + send_forwarding_failure(client_fd_write); goto out; } - server_fd = fdopen(server_socket, "a+"); - if (server_fd == NULL) { - LOG_PERROR(LOG_WARNING, "fdopen(): server failed"); - send_forwarding_failure(client_fd); + 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, "CONNECT %s:%s HTTP/1.0\r\n", host, port); - fprintf(server_fd, "\r\n"); + 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, buffer, sizeof(buffer)); + result = read_http_request(server_fd_read, buffer, sizeof(buffer)); if (result == -1) { - /* Read error. */ - LOG(LOG_WARNING, "read_http_request(): proxy read error"); - send_forwarding_failure(client_fd); + LOG(WARNING, "read_http_request(): proxy read error"); + send_forwarding_failure(client_fd_write); goto out; } else if (result == -2) { - /* EOF */ - LOG(LOG_WARNING, "read_http_request(): proxy EOF"); - send_forwarding_failure(client_fd); + 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(LOG_WARNING, "bad proxy response: %s", buffer); - send_forwarding_failure(client_fd); + LOG(WARNING, "bad proxy response: %s", buffer); + send_forwarding_failure(client_fd_write); goto out; } } - LOG(LOG_DEBUG, "connection to server established"); + LOG(DEBUG, "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 @@ -200,17 +198,17 @@ void handle_connection(int client_socket) { if (server_certificate_file(&file, host, path, sizeof(path)) == -2) { /* We've established a connection, tell the client. */ - fprintf(client_fd, "HTTP/1.0 200 Connection established\r\n"); - fprintf(client_fd, "\r\n"); - fflush(client_fd); + fprintf(client_fd_write, "HTTP/1.0 200 Connection established\r\n"); + fprintf(client_fd_write, "\r\n"); + fflush(client_fd_write); - LOG(LOG_DEBUG, "transferring data"); + LOG(DEBUG, "transferring data"); /* Proxy data between client and server until one side is done * (EOF or error). */ transfer_data(client_socket, server_socket); - LOG(LOG_DEBUG, "finished transferring data"); + LOG(DEBUG, "finished transferring data"); goto out; } @@ -224,30 +222,30 @@ void handle_connection(int client_socket) { result = initialize_tls_session_server(server_socket, &server_session, &server_x509_cred); if (result != 0) { - LOG(LOG_WARNING, "initialize_tls_session_server() failed"); - send_forwarding_failure(client_fd); + LOG(WARNING, "initialize_tls_session_server() failed"); + send_forwarding_failure(client_fd_write); goto out; } server_session_init = 1; - LOG(LOG_DEBUG, "starting server TLS handshake"); + LOG(DEBUG, "starting server TLS handshake"); /* Try to establish TLS handshake between us and server. */ result = gnutls_handshake(server_session); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_WARNING, "server TLS handshake failed: %s", + LOG(WARNING, "server TLS handshake failed: %s", gnutls_strerror(result)); - send_forwarding_failure(client_fd); + send_forwarding_failure(client_fd_write); goto out; } server_session_started = 1; - LOG(LOG_DEBUG, "server TLS handshake finished"); + LOG(DEBUG, "server TLS handshake finished"); /* Make sure the server certificate is valid and known. */ if (verify_tls_connection(server_session, host) != 0) { - LOG(LOG_ERROR, "server certificate validation failed!"); - /* We send the error message over our TLS connection to the client, + 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; @@ -262,30 +260,30 @@ void handle_connection(int client_socket) { &client_session, &client_x509_cred); if (result != 0) { - LOG(LOG_WARNING, "initialize_tls_session_client() failed"); - send_forwarding_failure(client_fd); + 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, "HTTP/1.0 200 Connection established\r\n"); - fprintf(client_fd, "\r\n"); - fflush(client_fd); + fprintf(client_fd_write, "HTTP/1.0 200 Connection established\r\n"); + fprintf(client_fd_write, "\r\n"); + fflush(client_fd_write); - LOG(LOG_DEBUG, "starting client TLS handshake"); + LOG(DEBUG, "starting client TLS handshake"); /* Try to establish TLS handshake between client and us. */ result = gnutls_handshake(client_session); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_WARNING, "client TLS handshake failed: %s", + LOG(WARNING, "client TLS handshake failed: %s", gnutls_strerror(result)); - send_forwarding_failure(client_fd); + send_forwarding_failure(client_fd_write); goto out; } client_session_started = 1; - LOG(LOG_DEBUG, "client TLS handshake finished"); + LOG(DEBUG, "client TLS handshake finished"); /* Tell the client that the verification failed. Shouldn't be necessary as * the client should terminate the connection because he received the @@ -295,14 +293,14 @@ void handle_connection(int client_socket) { goto out; } - LOG(LOG_DEBUG, "transferring TLS data"); + LOG(DEBUG, "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(LOG_DEBUG, "finished transferring TLS data"); + LOG(DEBUG, "finished transferring TLS data"); out: /* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is @@ -325,21 +323,27 @@ out: } /* Close connection to server/proxy. */ - if (server_fd != NULL) { - fclose(server_fd); + 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(LOG_DEBUG, "connection to server closed"); + LOG(DEBUG, "connection to server closed"); /* Close connection to client. */ - if (client_fd != NULL) { - fclose(client_fd); + if (client_fd_read != NULL) { + if (client_fd_write != NULL) { + fclose(client_fd_write); + } + fclose(client_fd_read); } else { close(client_socket); } - LOG(LOG_DEBUG, "connection to client closed"); + LOG(DEBUG, "connection to client closed"); - LOG(LOG_DEBUG, "connection finished"); + LOG(DEBUG, "connection finished"); } @@ -356,7 +360,7 @@ static int initialize_tls_session_client(int peer_socket, use_invalid_cert = (!strcmp(hostname, "invalid")); if (proxy_certificate_path(hostname, path, sizeof(path)) != 0) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): \ failed to get proxy certificate path"); return -1; @@ -364,7 +368,7 @@ failed to get proxy certificate path"); result = gnutls_certificate_allocate_credentials(x509_cred); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): \ gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); @@ -377,7 +381,7 @@ gnutls_certificate_allocate_credentials(): %s", PROXY_CA_FILE, GNUTLS_X509_FMT_PEM); if (result <= 0) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): can't read CA file: '%s'", PROXY_CA_FILE); gnutls_certificate_free_credentials(*x509_cred); @@ -401,7 +405,7 @@ gnutls_certificate_allocate_credentials(): %s", GNUTLS_X509_FMT_PEM); } if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): \ can't read server certificate ('%s') or key file ('%s'): %s", path, PROXY_KEY_FILE, gnutls_strerror(result)); @@ -414,7 +418,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", result = gnutls_init(session, GNUTLS_SERVER); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): gnutls_init(): %s", gnutls_strerror(result)); gnutls_certificate_free_credentials(*x509_cred); @@ -422,7 +426,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", } result = gnutls_priority_set(*session, global_tls_priority_cache); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): gnutls_priority_set(): %s", gnutls_strerror(result)); gnutls_deinit(*session); @@ -432,7 +436,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", result = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, *x509_cred); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_client(): gnutls_credentials_set(): %s", gnutls_strerror(result)); gnutls_deinit(*session); @@ -451,7 +455,7 @@ static int initialize_tls_session_server(int peer_socket, result = gnutls_certificate_allocate_credentials(x509_cred); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_server(): \ gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); @@ -460,7 +464,7 @@ gnutls_certificate_allocate_credentials(): %s", result = gnutls_init(session, GNUTLS_CLIENT); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_server(): gnutls_init(): %s", gnutls_strerror(result)); gnutls_certificate_free_credentials(*x509_cred); @@ -468,7 +472,7 @@ gnutls_certificate_allocate_credentials(): %s", } result = gnutls_priority_set(*session, global_tls_priority_cache); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_server(): gnutls_priority_set(): %s", gnutls_strerror(result)); gnutls_deinit(*session); @@ -478,7 +482,7 @@ gnutls_certificate_allocate_credentials(): %s", result = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, *x509_cred); if (result != GNUTLS_E_SUCCESS) { - LOG(LOG_ERROR, + LOG(ERROR, "initialize_tls_session_server(): gnutls_credentials_set(): %s", gnutls_strerror(result)); gnutls_deinit(*session); @@ -492,6 +496,24 @@ gnutls_certificate_allocate_credentials(): %s", } +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. @@ -501,10 +523,10 @@ static int read_http_request(FILE *client_fd, char *request, size_t length) { if (fgets(request, (int)length, client_fd) == NULL) { if (ferror(client_fd)) { - LOG_PERROR(LOG_WARNING, "read_http_request(): fgets()"); + LOG_PERROR(WARNING, "read_http_request(): fgets()"); return -1; } - + /* EOF */ return -2; } @@ -515,7 +537,7 @@ static int read_http_request(FILE *client_fd, char *request, size_t length) { } } if (ferror(client_fd)) { - LOG_PERROR(LOG_WARNING, "read_http_request(): fgets()"); + LOG_PERROR(WARNING, "read_http_request(): fgets()"); return -1; } @@ -528,6 +550,7 @@ static void send_bad_request(FILE *client_fd) { fprintf(client_fd, HTTP_RESPONSE_FORMAT, RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_MSG); + fflush(client_fd); #undef RESPONSE_ERROR #undef RESPONSE_MSG } @@ -537,6 +560,7 @@ static void send_forwarding_failure(FILE *client_fd) { fprintf(client_fd, HTTP_RESPONSE_FORMAT, RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_MSG); + fflush(client_fd); #undef RESPONSE_ERROR #undef RESPONSE_MSG } @@ -556,11 +580,11 @@ static void tls_send_invalid_cert_message(gnutls_session_t session) { RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_MSG); if (result < 0) { - LOG_PERROR(LOG_ERROR, + LOG_PERROR(ERROR, "tls_send_invalid_cert_message(): snprintf failed"); return; } else if ((size_t)result >= sizeof(buffer)) { - LOG(LOG_ERROR, + LOG(ERROR, "tls_send_invalid_cert_message(): snprintf buffer too short"); return; } @@ -584,9 +608,9 @@ static void transfer_data(int client, int server) { fds[1].revents = 0; for (;;) { - int result = poll(fds, 2, -1 /* no timeout */); + int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); if (result < 0) { - LOG_PERROR(LOG_ERROR, "transfer_data(): poll()"); + LOG_PERROR(ERROR, "transfer_data(): poll()"); return; } @@ -623,25 +647,24 @@ static int read_from_write_to(int from, int to) { ssize_t size_written; char buffer[4096]; - LOG(LOG_DEBUG, "read_from_write_to(): %d -> %d", from, to); + LOG(DEBUG, "read_from_write_to(): %d -> %d", from, to); size_read = read(from, buffer, sizeof(buffer)); if (size_read < 0) { - LOG_PERROR(LOG_WARNING, "read_from_write_to(): read()"); + LOG_PERROR(WARNING, "read_from_write_to(): read()"); return -1; - } /* EOF */ - if (size_read == 0) { + } else if (size_read == 0) { return -1; } size_written = write(to, buffer, (size_t)size_read); if (size_written < 0) { - LOG_PERROR(LOG_WARNING, "read_from_write_to(): write()"); + LOG_PERROR(WARNING, "read_from_write_to(): write()"); return -1; } if (size_read != size_written) { - LOG(LOG_ERROR, "read_from_write_to(): only written %ld of %ld bytes!", + LOG(ERROR, "read_from_write_to(): only written %ld of %ld bytes!", (long int)size_written, (long int)size_read); return -1; } @@ -669,13 +692,13 @@ 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(LOG_DEBUG, "transfer_data_tls(): suggested buffer size: %ld", + LOG(DEBUG, "transfer_data_tls(): suggested buffer size: %ld", (long int)buffer_size); for (;;) { - int result = poll(fds, 2, -1 /* no timeout */); + int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); if (result < 0) { - LOG_PERROR(LOG_ERROR, "transfer_data(): poll()"); + LOG_PERROR(ERROR, "transfer_data(): poll()"); return; } @@ -718,28 +741,27 @@ static int read_from_write_to_tls(gnutls_session_t from, if (buffer_size > sizeof(buffer)) { buffer_size = sizeof(buffer); } - LOG(LOG_DEBUG, "read_from_write_to_tls(): used buffer size: %ld", + LOG(DEBUG, "read_from_write_to_tls(): used buffer size: %ld", (long int)buffer_size); size_read = gnutls_record_recv(from, buffer, buffer_size); if (size_read < 0) { - LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s", + LOG(WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s", gnutls_strerror((int)size_read)); return -1; - } /* EOF */ - if (size_read == 0) { + } else if (size_read == 0) { return -1; } size_written = gnutls_record_send(to, buffer, (size_t)size_read); if (size_written < 0) { - LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_send(): %s", + LOG(WARNING, "read_from_write_to_tls(): gnutls_record_send(): %s", gnutls_strerror((int)size_written)); return -1; } if (size_read != size_written) { - LOG(LOG_ERROR, "read_from_write_to_tls(): only written %ld of %ld bytes!", + LOG(ERROR, "read_from_write_to_tls(): only written %ld of %ld bytes!", (long int)size_written, (long int)size_read); return -1; } @@ -771,9 +793,9 @@ static int connect_to_host(const char *hostname, const char *port) { gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result); if (gai_return != 0) { if (gai_return == EAI_SYSTEM) { - LOG_PERROR(LOG_WARNING, "connect_to_host(): getaddrinfo()"); + LOG_PERROR(WARNING, "connect_to_host(): getaddrinfo()"); } else { - LOG(LOG_WARNING, "connect_to_host(): getaddrinfo(): %s", + LOG(WARNING, "connect_to_host(): getaddrinfo(): %s", gai_strerror(gai_return)); } return -1; @@ -786,14 +808,14 @@ static int connect_to_host(const char *hostname, const char *port) { server->ai_socktype, server->ai_protocol); if (server_socket == -1) { - LOG_PERROR(LOG_DEBUG, "connect_to_host(): socket(), trying next"); + LOG_PERROR(DEBUG, "connect_to_host(): socket(), trying next"); continue; } if (connect(server_socket, server->ai_addr, server->ai_addrlen) != -1) { break; } - LOG_PERROR(LOG_DEBUG, "connect_to_host(): connect(), trying next"); + LOG_PERROR(DEBUG, "connect_to_host(): connect(), trying next"); close(server_socket); } @@ -801,7 +823,7 @@ static int connect_to_host(const char *hostname, const char *port) { freeaddrinfo(gai_result); if (server == NULL) { - LOG_PERROR(LOG_WARNING, "connect_to_host(): no server found, abort"); + LOG_PERROR(WARNING, "connect_to_host(): no server found, abort"); return -1; }