X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Fconnection.c;h=170302c9fdaf9894267c91da2ebd4934a27a6843;hb=f3ca90e517a9ae54e831e5a5b91fcc2afb9df5bf;hp=54e5671fc8fc14fd21e85f1c5ce1688707ea8011;hpb=2a478be51f6e6d8f56895e3fee3b122625042d8c;p=tlsproxy%2Ftlsproxy.git diff --git a/src/connection.c b/src/connection.c index 54e5671..170302c 100644 --- a/src/connection.c +++ b/src/connection.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -36,11 +37,11 @@ /* Format string used to send HTTP/1.0 error responses to the client. * - * %s is used 4 times, first three are the error code (no %n$s!), the last is - * the message. */ + * %s is used 5 times, first is the error code, then additional headers, next + * two are the error code (no %n$s!), the last is the message. */ #define HTTP_RESPONSE_FORMAT "HTTP/1.0 %s\r\n\ Content-Type: text/html; charset=US-ASCII\r\n\ -\r\n\ +%s\r\n\ \n\ \n\ %s\n\ @@ -62,6 +63,7 @@ static int initialize_tls_session_server(int peer_socket, 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); @@ -104,7 +106,7 @@ void handle_connection(int client_socket) { * certificate. */ int validation_failed; - LOG(DEBUG, "new connection"); + LOG(DEBUG1, "new connection"); server_socket = -1; client_fd_read = NULL; @@ -131,6 +133,10 @@ void handle_connection(int client_socket) { LOG(WARNING, "read_http_request(): client EOF"); send_bad_request(client_fd_write); goto out; + } else if (result == -3) { + LOG(DEBUG1, "read_http_request(): proxy authentication failed"); + send_authentication_required(client_fd_write); + goto out; } if (parse_request(buffer, host, port, &version_minor) != 0) { @@ -139,19 +145,19 @@ void handle_connection(int client_socket) { goto out; } - LOG(DEBUG, "target: %s:%s (HTTP 1.%d)", host, port, version_minor); + LOG(DEBUG1, "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(DEBUG, "connecting to %s:%s", global_proxy_host, - global_proxy_port); + 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(DEBUG, "connecting to %s:%s", host, port); + LOG(DEBUG1, "connecting to %s:%s", host, port); server_socket = connect_to_host(host, port); } - if (server_socket == -1) { + if (server_socket < 0) { LOG(WARNING, "failed to connect to server"); send_forwarding_failure(client_fd_write); goto out; @@ -188,7 +194,7 @@ void handle_connection(int client_socket) { } } - LOG(DEBUG, "connection to server established"); + 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 @@ -203,13 +209,13 @@ void handle_connection(int client_socket) { fprintf(client_fd_write, "\r\n"); fflush(client_fd_write); - LOG(DEBUG, "transferring data"); + 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(DEBUG, "finished transferring data"); + LOG(DEBUG1, "finished transferring data"); goto out; } @@ -229,19 +235,19 @@ void handle_connection(int client_socket) { } server_session_init = 1; - LOG(DEBUG, "starting server TLS handshake"); + 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)); + gnutls_strerror(result)); send_forwarding_failure(client_fd_write); goto out; } server_session_started = 1; - LOG(DEBUG, "server TLS handshake finished"); + LOG(DEBUG1, "server TLS handshake finished"); /* Make sure the server certificate is valid and known. */ if (verify_tls_connection(server_session, host) != 0) { @@ -272,19 +278,19 @@ void handle_connection(int client_socket) { fprintf(client_fd_write, "\r\n"); fflush(client_fd_write); - LOG(DEBUG, "starting client TLS handshake"); + 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)); + gnutls_strerror(result)); send_forwarding_failure(client_fd_write); goto out; } client_session_started = 1; - LOG(DEBUG, "client TLS handshake finished"); + LOG(DEBUG1, "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 @@ -294,14 +300,14 @@ void handle_connection(int client_socket) { goto out; } - LOG(DEBUG, "transferring TLS data"); + 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(DEBUG, "finished transferring TLS data"); + LOG(DEBUG1, "finished transferring TLS data"); out: /* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is @@ -332,7 +338,7 @@ out: } else if (server_socket != -1) { close(server_socket); } - LOG(DEBUG, "connection to server closed"); + LOG(DEBUG1, "connection to server closed"); /* Close connection to client. */ if (client_fd_read != NULL) { if (client_fd_write != NULL) { @@ -342,9 +348,9 @@ out: } else { close(client_socket); } - LOG(DEBUG, "connection to client closed"); + LOG(DEBUG1, "connection to client closed"); - LOG(DEBUG, "connection finished"); + LOG(DEBUG1, "connection finished"); } @@ -362,16 +368,16 @@ static int initialize_tls_session_client(int peer_socket, if (proxy_certificate_path(hostname, path, sizeof(path)) != 0) { LOG(ERROR, - "initialize_tls_session_client(): \ -failed to get proxy certificate path"); + "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", + "initialize_tls_session_client(): " + "gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); return -1; } @@ -407,8 +413,8 @@ gnutls_certificate_allocate_credentials(): %s", } if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, - "initialize_tls_session_client(): \ -can't read server certificate ('%s') or key file ('%s'): %s", + "initialize_tls_session_client(): " + "can't read server certificate ('%s') or key file ('%s'): %s", path, PROXY_KEY_FILE, gnutls_strerror(result)); gnutls_certificate_free_credentials(*x509_cred); /* Could be a missing certificate. */ @@ -457,8 +463,8 @@ static int initialize_tls_session_server(int peer_socket, result = gnutls_certificate_allocate_credentials(x509_cred); if (result != GNUTLS_E_SUCCESS) { LOG(ERROR, - "initialize_tls_session_server(): \ -gnutls_certificate_allocate_credentials(): %s", + "initialize_tls_session_server(): " + "gnutls_certificate_allocate_credentials(): %s", gnutls_strerror(result)); return -1; } @@ -521,7 +527,9 @@ 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) { 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()"); @@ -531,7 +539,22 @@ static int read_http_request(FILE *client_fd, char *request, size_t length) { return -2; } + found_proxy_authorization = 0; while (fgets(buffer, sizeof(buffer), client_fd) != NULL) { + const char *authentication = "Proxy-Authorization: Basic "; + + if (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), + http_digest_authorization)) { + return -3; + } + } + /* End of header. */ if (!strcmp(buffer, "\n") || !strcmp(buffer, "\r\n")) { break; @@ -542,19 +565,30 @@ static int read_http_request(FILE *client_fd, char *request, size_t length) { return -1; } + if (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); + 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); + fprintf(client_fd, HTTP_RESPONSE_FORMAT, error, "", error, error, msg); fflush(client_fd); } static void tls_send_invalid_cert_message(gnutls_session_t session) { @@ -566,7 +600,7 @@ static void tls_send_invalid_cert_message(gnutls_session_t session) { + 3 * sizeof(error) + sizeof(msg)]; result = snprintf(buffer, sizeof(buffer), HTTP_RESPONSE_FORMAT, - error, error, error, msg); + error, "", error, error, msg); assert(result > 0 && (size_t)result < sizeof(buffer)); gnutls_record_send(session, buffer, strlen(buffer)); @@ -584,6 +618,8 @@ static void transfer_data(int client, int server) { fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR; fds[1].revents = 0; + LOG(DEBUG1, "transfer_data(): %d -> %d", client, server); + for (;;) { int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); if (result < 0) { @@ -624,8 +660,6 @@ static int read_from_write_to(int from, int to) { ssize_t size_written; char buffer[4096]; - LOG(DEBUG, "read_from_write_to(): %d -> %d", from, to); - size_read = read(from, buffer, sizeof(buffer)); if (size_read < 0) { LOG_PERROR(WARNING, "read_from_write_to(): read()"); @@ -642,7 +676,7 @@ static int read_from_write_to(int from, int to) { } 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); + (long int)size_written, (long int)size_read); return -1; } @@ -669,8 +703,8 @@ 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(DEBUG, "transfer_data_tls(): suggested buffer size: %ld", - (long int)buffer_size); + LOG(DEBUG1, "transfer_data_tls(): suggested buffer size: %ld", + (long int)buffer_size); for (;;) { int result = poll(fds, 2 /* fd count */, -1 /* no timeout */); @@ -716,15 +750,15 @@ static int read_from_write_to_tls(gnutls_session_t from, char buffer[16384]; if (buffer_size > sizeof(buffer)) { + LOG(WARNING, "read_from_write_to_tls(): reduced buffer size to %ld", + (long int)(sizeof(buffer))); buffer_size = sizeof(buffer); } - 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(WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s", - gnutls_strerror((int)size_read)); + gnutls_strerror((int)size_read)); return -1; /* EOF */ } else if (size_read == 0) { @@ -734,12 +768,12 @@ static int read_from_write_to_tls(gnutls_session_t from, 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)); + gnutls_strerror((int)size_written)); 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); + (long int)size_written, (long int)size_read); return -1; } @@ -773,7 +807,7 @@ static int connect_to_host(const char *hostname, const char *port) { LOG_PERROR(WARNING, "connect_to_host(): getaddrinfo()"); } else { LOG(WARNING, "connect_to_host(): getaddrinfo(): %s", - gai_strerror(gai_return)); + gai_strerror(gai_return)); } return -1; } @@ -784,15 +818,15 @@ static int connect_to_host(const char *hostname, const char *port) { server_socket = socket(server->ai_family, server->ai_socktype, server->ai_protocol); - if (server_socket == -1) { - LOG_PERROR(DEBUG, "connect_to_host(): socket(), trying next"); + if (server_socket < 0) { + LOG_PERROR(DEBUG1, "connect_to_host(): socket(), trying next"); continue; } - if (connect(server_socket, server->ai_addr, server->ai_addrlen) != -1) { + if (connect(server_socket, server->ai_addr, server->ai_addrlen) == 0) { break; } - LOG_PERROR(DEBUG, "connect_to_host(): connect(), trying next"); + LOG_PERROR(DEBUG1, "connect_to_host(): connect(), trying next"); close(server_socket); }