X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Fconnection.c;h=82b13bf0d04f5a316968bb18577378a2d47f8c47;hb=8a50081c2a92d1e91501cd74adb3f3472f2bea2b;hp=700a3548345398a436aaf9a26b5144714e85f230;hpb=76ad95f5a7601b7e0549a4f4624443287f64a262;p=tlsproxy%2Ftlsproxy.git diff --git a/src/connection.c b/src/connection.c index 700a354..82b13bf 100644 --- a/src/connection.c +++ b/src/connection.c @@ -1,7 +1,7 @@ /* * Handle connections. * - * Copyright (C) 2011 Simon Ruderich + * Copyright (C) 2011-2013 Simon Ruderich * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -21,14 +21,10 @@ #include "connection.h" #include "verify.h" -/* close() */ -#include -/* getaddrinfo() */ +#include #include -/* poll() */ #include -/* errno */ -#include +#include /* Maximum length of a HTTP request line. Longer request lines are aborted @@ -89,7 +85,7 @@ void handle_connection(int client_socket) { 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 @@ -118,25 +114,23 @@ void handle_connection(int client_socket) { validation_failed = 0; client_fd = fdopen(client_socket, "a+"); - if (NULL == client_fd) { + if (client_fd == NULL) { LOG_PERROR(LOG_WARNING, "fdopen(): client failed"); goto out; } /* Read request line (CONNECT ..) and headers (they are discarded). */ result = read_http_request(client_fd, buffer, sizeof(buffer)); - if (-1 == result) { - /* Read error. */ + if (result == -1) { LOG(LOG_WARNING, "read_http_request(): client read error"); goto out; - } else if (-2 == result) { - /* EOF */ + } else if (result == -2) { LOG(LOG_WARNING, "read_http_request(): client EOF"); send_bad_request(client_fd); goto out; } - if (0 != parse_request(buffer, host, port, &version_minor)) { + if (parse_request(buffer, host, port, &version_minor) != 0) { LOG(LOG_WARNING, "bad request: %s", buffer); send_bad_request(client_fd); goto out; @@ -145,7 +139,7 @@ void handle_connection(int client_socket) { LOG(LOG_DEBUG, "target: %s:%s (HTTP 1.%d)", host, port, version_minor); /* Connect to proxy server or directly to server. */ - if (NULL != global_proxy_host && NULL != global_proxy_port) { + if (global_proxy_host != NULL && global_proxy_port != NULL) { LOG(LOG_DEBUG, "connecting to %s:%s", global_proxy_host, global_proxy_port); server_socket = connect_to_host(global_proxy_host, global_proxy_port); @@ -154,39 +148,38 @@ void handle_connection(int client_socket) { server_socket = connect_to_host(host, port); } - if (-1 == server_socket) { + if (server_socket == -1) { LOG(LOG_WARNING, "failed to connect to server"); send_forwarding_failure(client_fd); goto out; } server_fd = fdopen(server_socket, "a+"); - if (NULL == server_fd) { + if (server_fd == NULL) { LOG_PERROR(LOG_WARNING, "fdopen(): server failed"); send_forwarding_failure(client_fd); goto out; } /* Connect to proxy if requested (command line option). */ - if (NULL != global_proxy_host && NULL != global_proxy_port) { + 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"); + fflush(server_fd); /* Read response line from proxy server. */ result = read_http_request(server_fd, buffer, sizeof(buffer)); - if (-1 == result) { - /* Read error. */ + if (result == -1) { LOG(LOG_WARNING, "read_http_request(): proxy read error"); send_forwarding_failure(client_fd); goto out; - } else if (-2 == result) { - /* EOF */ + } else if (result == -2) { LOG(LOG_WARNING, "read_http_request(): proxy EOF"); send_forwarding_failure(client_fd); goto out; } /* Check response of proxy server. */ - if (0 != strncmp(buffer, "HTTP/1.0 200", 12)) { + if (strncmp(buffer, "HTTP/1.0 200", 12)) { LOG(LOG_WARNING, "bad proxy response: %s", buffer); send_forwarding_failure(client_fd); goto out; @@ -199,10 +192,10 @@ void handle_connection(int client_socket) { * certificate then just pass through the connection and let the client * verify the server certificate. */ if (global_passthrough_unknown) { - char path[1024]; + char path[TLSPROXY_MAX_PATH_LENGTH]; FILE *file = NULL; - if (-2 == server_certificate_file(&file, host, path, sizeof(path))) { + 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"); @@ -219,7 +212,7 @@ void handle_connection(int client_socket) { goto out; } /* server_certificate_file() may have opened the file, close it. */ - if (NULL != file) { + if (file != NULL) { fclose(file); } } @@ -227,7 +220,7 @@ void handle_connection(int client_socket) { /* Initialize TLS client credentials to talk to the server. */ result = initialize_tls_session_server(server_socket, &server_session, &server_x509_cred); - if (0 != result) { + if (result != 0) { LOG(LOG_WARNING, "initialize_tls_session_server() failed"); send_forwarding_failure(client_fd); goto out; @@ -238,7 +231,7 @@ void handle_connection(int client_socket) { /* Try to establish TLS handshake between us and server. */ result = gnutls_handshake(server_session); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_WARNING, "server TLS handshake failed: %s", gnutls_strerror(result)); send_forwarding_failure(client_fd); @@ -249,9 +242,9 @@ void handle_connection(int client_socket) { LOG(LOG_DEBUG, "server TLS handshake finished"); /* Make sure the server certificate is valid and known. */ - if (0 != verify_tls_connection(server_session, host)) { + 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, + /* 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; @@ -265,7 +258,7 @@ void handle_connection(int client_socket) { : host, &client_session, &client_x509_cred); - if (0 != result) { + if (result != 0) { LOG(LOG_WARNING, "initialize_tls_session_client() failed"); send_forwarding_failure(client_fd); goto out; @@ -281,7 +274,7 @@ void handle_connection(int client_socket) { /* Try to establish TLS handshake between client and us. */ result = gnutls_handshake(client_session); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_WARNING, "client TLS handshake failed: %s", gnutls_strerror(result)); send_forwarding_failure(client_fd); @@ -311,17 +304,17 @@ void handle_connection(int client_socket) { out: /* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is * reliable transmitted. */ - if (0 != server_session_started) { + if (server_session_started) { gnutls_bye(server_session, GNUTLS_SHUT_RDWR); } - if (0 != client_session_started) { + if (client_session_started) { gnutls_bye(client_session, GNUTLS_SHUT_RDWR); } - if (0 != server_session_init) { + if (server_session_init) { gnutls_deinit(server_session); gnutls_certificate_free_credentials(server_x509_cred); } - if (0 != client_session_init) { + if (client_session_init) { gnutls_deinit(client_session); gnutls_certificate_free_cas(client_x509_cred); gnutls_certificate_free_keys(client_x509_cred); @@ -329,14 +322,14 @@ out: } /* Close connection to server/proxy. */ - if (NULL != server_fd) { + if (server_fd != NULL) { fclose(server_fd); - } else if (-1 != server_socket) { + } else if (server_socket != -1) { close(server_socket); } LOG(LOG_DEBUG, "connection to server closed"); /* Close connection to client. */ - if (NULL != client_fd) { + if (client_fd != NULL) { fclose(client_fd); } else { close(client_socket); @@ -353,13 +346,13 @@ static int initialize_tls_session_client(int peer_socket, gnutls_certificate_credentials_t *x509_cred) { int result; int use_invalid_cert; - char path[1024]; + 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 = (0 == strcmp(hostname, "invalid")); + use_invalid_cert = (!strcmp(hostname, "invalid")); - if (0 != proxy_certificate_path(hostname, path, sizeof(path))) { + if (proxy_certificate_path(hostname, path, sizeof(path)) != 0) { LOG(LOG_ERROR, "initialize_tls_session_client(): \ failed to get proxy certificate path"); @@ -367,7 +360,7 @@ failed to get proxy certificate path"); } result = gnutls_certificate_allocate_credentials(x509_cred); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_client(): \ gnutls_certificate_allocate_credentials(): %s", @@ -380,7 +373,7 @@ gnutls_certificate_allocate_credentials(): %s", result = gnutls_certificate_set_x509_trust_file(*x509_cred, PROXY_CA_FILE, GNUTLS_X509_FMT_PEM); - if (0 >= result) { + if (result <= 0) { LOG(LOG_ERROR, "initialize_tls_session_client(): can't read CA file: '%s'", PROXY_CA_FILE); @@ -404,7 +397,7 @@ gnutls_certificate_allocate_credentials(): %s", PROXY_KEY_FILE, GNUTLS_X509_FMT_PEM); } - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_client(): \ can't read server certificate ('%s') or key file ('%s'): %s", @@ -417,7 +410,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", gnutls_certificate_set_dh_params(*x509_cred, global_tls_dh_params); result = gnutls_init(session, GNUTLS_SERVER); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_client(): gnutls_init(): %s", gnutls_strerror(result)); @@ -425,7 +418,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", return -1; } result = gnutls_priority_set(*session, global_tls_priority_cache); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_client(): gnutls_priority_set(): %s", gnutls_strerror(result)); @@ -435,7 +428,7 @@ can't read server certificate ('%s') or key file ('%s'): %s", } result = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, *x509_cred); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_client(): gnutls_credentials_set(): %s", gnutls_strerror(result)); @@ -454,7 +447,7 @@ static int initialize_tls_session_server(int peer_socket, int result; result = gnutls_certificate_allocate_credentials(x509_cred); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_server(): \ gnutls_certificate_allocate_credentials(): %s", @@ -463,15 +456,15 @@ gnutls_certificate_allocate_credentials(): %s", } result = gnutls_init(session, GNUTLS_CLIENT); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_server(): gnutls_init(): %s", gnutls_strerror(result)); gnutls_certificate_free_credentials(*x509_cred); return -1; } - gnutls_priority_set(*session, global_tls_priority_cache); - if (GNUTLS_E_SUCCESS != result) { + result = gnutls_priority_set(*session, global_tls_priority_cache); + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_server(): gnutls_priority_set(): %s", gnutls_strerror(result)); @@ -481,7 +474,7 @@ gnutls_certificate_allocate_credentials(): %s", } result = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, *x509_cred); - if (GNUTLS_E_SUCCESS != result) { + if (result != GNUTLS_E_SUCCESS) { LOG(LOG_ERROR, "initialize_tls_session_server(): gnutls_credentials_set(): %s", gnutls_strerror(result)); @@ -503,18 +496,18 @@ gnutls_certificate_allocate_credentials(): %s", static int read_http_request(FILE *client_fd, char *request, size_t length) { char buffer[MAX_REQUEST_LINE]; - if (NULL == fgets(request, (int)length, client_fd)) { + if (fgets(request, (int)length, client_fd) == NULL) { if (ferror(client_fd)) { LOG_PERROR(LOG_WARNING, "read_http_request(): fgets()"); return -1; } - + /* EOF */ return -2; } - while (NULL != fgets(buffer, sizeof(buffer), client_fd)) { + while (fgets(buffer, sizeof(buffer), client_fd) != NULL) { /* End of header. */ - if (0 == strcmp(buffer, "\n") || 0 == strcmp(buffer, "\r\n")) { + if (!strcmp(buffer, "\n") || !strcmp(buffer, "\r\n")) { break; } } @@ -532,6 +525,7 @@ 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 } @@ -541,6 +535,7 @@ 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 } @@ -588,7 +583,7 @@ 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()"); return; @@ -596,14 +591,14 @@ static void transfer_data(int client, int server) { /* Data available from client. */ if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { - if (0 != read_from_write_to(client, server)) { + 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 (0 != read_from_write_to(server, client)) { + if (read_from_write_to(server, client) != 0) { /* EOF (or other error) */ break; } @@ -630,17 +625,16 @@ static int read_from_write_to(int from, int to) { LOG(LOG_DEBUG, "read_from_write_to(): %d -> %d", from, to); size_read = read(from, buffer, sizeof(buffer)); - if (0 > size_read) { + if (size_read < 0) { LOG_PERROR(LOG_WARNING, "read_from_write_to(): read()"); return -1; - } /* EOF */ - if (0 == size_read) { + } else if (size_read == 0) { return -1; } size_written = write(to, buffer, (size_t)size_read); - if (0 > size_written) { + if (size_written < 0) { LOG_PERROR(LOG_WARNING, "read_from_write_to(): write()"); return -1; } @@ -670,14 +664,14 @@ static void transfer_data_tls(int client, int server, /* Get maximum possible buffer size. */ buffer_size = gnutls_record_get_max_size(client_session); - if (buffer_size > gnutls_record_get_max_size(server_session)) { + 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", (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()"); return; @@ -685,16 +679,16 @@ static void transfer_data_tls(int client, int server, /* Data available from client. */ if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { - if (0 != read_from_write_to_tls(client_session, server_session, - buffer_size)) { + 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 (0 != read_from_write_to_tls(server_session, client_session, - buffer_size)) { + if (read_from_write_to_tls(server_session, client_session, + buffer_size) != 0) { /* EOF (or other error) */ break; } @@ -726,18 +720,17 @@ static int read_from_write_to_tls(gnutls_session_t from, (long int)buffer_size); size_read = gnutls_record_recv(from, buffer, buffer_size); - if (0 > size_read) { + if (size_read < 0) { LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s", gnutls_strerror((int)size_read)); return -1; - } /* EOF */ - if (0 == size_read) { + } else if (size_read == 0) { return -1; } size_written = gnutls_record_send(to, buffer, (size_t)size_read); - if (0 > size_written) { + if (size_written < 0) { LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_send(): %s", gnutls_strerror((int)size_written)); return -1; @@ -760,7 +753,7 @@ static int connect_to_host(const char *hostname, const char *port) { int server_socket; struct addrinfo *server; - if (NULL == hostname || NULL == port) { + if (hostname == NULL || port == NULL) { return -1; } @@ -773,24 +766,28 @@ static int connect_to_host(const char *hostname, const char *port) { | AI_ADDRCONFIG /* supported by this computer */ | AI_V4MAPPED; /* support IPv4 through IPv6 */ gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result); - if (0 != gai_return) { - LOG_PERROR(LOG_WARNING, "connect_to_host(): getaddrinfo()"); + if (gai_return != 0) { + if (gai_return == EAI_SYSTEM) { + LOG_PERROR(LOG_WARNING, "connect_to_host(): getaddrinfo()"); + } else { + LOG(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; NULL != server; server = server->ai_next) { + for (server = gai_result; server != NULL; server = server->ai_next) { server_socket = socket(server->ai_family, server->ai_socktype, server->ai_protocol); - if (-1 == server_socket) { + if (server_socket == -1) { LOG_PERROR(LOG_DEBUG, "connect_to_host(): socket(), trying next"); continue; } - if (-1 != connect(server_socket, server->ai_addr, - server->ai_addrlen)) { + if (connect(server_socket, server->ai_addr, server->ai_addrlen) != -1) { break; } LOG_PERROR(LOG_DEBUG, "connect_to_host(): connect(), trying next"); @@ -800,7 +797,7 @@ static int connect_to_host(const char *hostname, const char *port) { /* Make sure we free the result from getaddrinfo(). */ freeaddrinfo(gai_result); - if (NULL == server) { + if (server == NULL) { LOG_PERROR(LOG_WARNING, "connect_to_host(): no server found, abort"); return -1; } @@ -822,20 +819,19 @@ static int parse_request(const char *request, char *host, char *port, char *position; /* scanf() doesn't check spaces. */ - if (0 != strncmp(request, "CONNECT ", 8)) { + if (strncmp(request, "CONNECT ", 8)) { return -1; } /* Check request and extract data, "host:port" is not yet separated. */ - if (2 != sscanf(request, "CONNECT %s HTTP/1.%d", - host, version_minor)) { + if (sscanf(request, "CONNECT %s HTTP/1.%d", host, version_minor) != 2) { return -1; } /* Make sure ":port" is there. */ - if (NULL == (position = strchr(host, ':'))) { + if ((position = strchr(host, ':')) == NULL) { return -1; } /* Make sure port is numeric. */ - if (1 != sscanf(position + 1, "%d", &port_unused)) { + if (sscanf(position + 1, "%d", &port_unused) != 1) { return -1; } /* Store it in *port. */