#include "tlsproxy.h"
#include "connection.h"
+#include "verify.h"
/* close() */
#include <unistd.h>
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);
+static void tls_send_invalid_cert_message(gnutls_session_t session);
-#if 0
static void transfer_data(int client, int server);
static int read_from_write_to(int from, int to);
-#endif
static void transfer_data_tls(int client, int server,
gnutls_session_t client_session,
gnutls_session_t server_session);
int client_session_init, server_session_init;
/* gnutls_handshake() called? - used for goto out */
int client_session_started, server_session_started;
+ /* Validation failed? If yes we need to send the special "invalid"
+ * certificate. */
+ int validation_failed;
LOG(LOG_DEBUG, "new connection");
server_session_init = 0;
client_session_started = 0;
server_session_started = 0;
+ validation_failed = 0;
client_fd = fdopen(client_socket, "a+");
if (NULL == client_fd) {
LOG(LOG_DEBUG, "connection to server established");
- /* 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);
+ /* 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
+ * verify the server certificate. */
+ if (global_passthrough_unknown) {
+ char path[1024];
+ FILE *file = NULL;
- /* Initialize TLS server credentials to talk to the client. */
- result = initialize_tls_session_client(client_socket, host,
- &client_session,
- &client_x509_cred);
- if (0 != result) {
- LOG(LOG_WARNING, "initialize_tls_session_client() failed");
- send_forwarding_failure(client_fd);
- goto out;
- }
- client_session_init = 1;
+ if (-2 == server_certificate_path(&file, host, path, sizeof(path))) {
+ /* 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);
- LOG(LOG_DEBUG, "starting client TLS handshake");
+ LOG(LOG_DEBUG, "transferring data");
- /* Try to establish TLS handshake between client and us. */
- result = gnutls_handshake(client_session);
- if (GNUTLS_E_SUCCESS != result) {
- LOG(LOG_WARNING, "client TLS handshake failed: %s",
- gnutls_strerror(result));
- send_forwarding_failure(client_fd);
- goto out;
- }
- client_session_started = 1;
+ /* Proxy data between client and server until one suite is done
+ * (EOF or error). */
+ transfer_data(client_socket, server_socket);
- LOG(LOG_DEBUG, "client TLS handshake finished");
+ LOG(LOG_DEBUG, "finished transferring data");
+
+ goto out;
+ }
+ /* server_certificate_path() may open the file, close it. */
+ if (NULL != file) {
+ fclose(file);
+ }
+ }
result = initialize_tls_session_server(server_socket, &server_session,
&server_x509_cred);
}
server_session_started = 1;
- LOG(LOG_DEBUG, "server TLS handshake finished, transferring data");
+ LOG(LOG_DEBUG, "server TLS handshake finished");
+
+ /* Make sure the server certificate is valid and known. */
+ if (0 != verify_tls_connection(server_session, host)) {
+ LOG(LOG_ERROR, "server certificate validation failed!");
+ /* We send the error message over our TLS connection to the client,
+ * but with an invalid certificate. */
+ validation_failed = 1;
+ }
+
+ /* Initialize TLS server credentials to talk to the client. */
+ result = initialize_tls_session_client(client_socket,
+ /* use special host if the server
+ * certificate was invalid */
+ (validation_failed) ? "invalid"
+ : host,
+ &client_session,
+ &client_x509_cred);
+ if (0 != result) {
+ LOG(LOG_WARNING, "initialize_tls_session_client() failed");
+ send_forwarding_failure(client_fd);
+ 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);
- /* FIXME: verify server's fingerprint */
+ LOG(LOG_DEBUG, "starting client TLS handshake");
+
+ /* Try to establish TLS handshake between client and us. */
+ result = gnutls_handshake(client_session);
+ if (GNUTLS_E_SUCCESS != result) {
+ LOG(LOG_WARNING, "client TLS handshake failed: %s",
+ gnutls_strerror(result));
+ send_forwarding_failure(client_fd);
+ goto out;
+ }
+ client_session_started = 1;
+
+ LOG(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
+ * invalid certificate but better be sure. */
+ if (validation_failed) {
+ tls_send_invalid_cert_message(client_session);
+ goto out;
+ }
+
+ LOG(LOG_DEBUG, "transferring TLS data");
/* Proxy data between client and server until one suite is done (EOF or
* error). */
transfer_data_tls(client_socket, server_socket,
client_session, server_session);
- LOG(LOG_DEBUG, "finished transferring data");
+ LOG(LOG_DEBUG, "finished transferring TLS data");
out:
/* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is
gnutls_session_t *session,
gnutls_certificate_credentials_t *x509_cred) {
int result;
+ int use_invalid_cert;
char path[1024];
+ /* 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");
+
/* Hostname too long. */
if (sizeof(path) - strlen(PROXY_SERVER_CERT_FORMAT) <= strlen(hostname)) {
LOG(LOG_WARNING,
}
/* Load proxy CA file, this CA "list" is send to the client. */
- result = gnutls_certificate_set_x509_trust_file(*x509_cred,
- PROXY_CA_FILE,
- GNUTLS_X509_FMT_PEM);
+ if (!use_invalid_cert) {
+ result = gnutls_certificate_set_x509_trust_file(*x509_cred,
+ PROXY_CA_FILE,
+ GNUTLS_X509_FMT_PEM);
+ /* If the invalid hostname was specified do nothing, we use a self-signed
+ * certificate in this case. */
+ } else {
+ result = 1;
+ }
if (0 >= result) {
LOG(LOG_ERROR,
"initialize_tls_session_client(): can't read CA file: '%s'",
PROXY_CA_FILE);
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
/* And certificate for this website and proxy's private key. */
- result = gnutls_certificate_set_x509_key_file(*x509_cred,
- path, PROXY_KEY_FILE,
- GNUTLS_X509_FMT_PEM);
+ if (!use_invalid_cert) {
+ result = gnutls_certificate_set_x509_key_file(*x509_cred,
+ path, PROXY_KEY_FILE,
+ GNUTLS_X509_FMT_PEM);
+ /* If the invalid hostname was specified load our special "invalid"
+ * certificate. */
+ } else {
+ result = gnutls_certificate_set_x509_key_file(*x509_cred,
+ PROXY_INVALID_CERT_FILE,
+ PROXY_KEY_FILE,
+ GNUTLS_X509_FMT_PEM);
+ }
if (GNUTLS_E_SUCCESS != result) {
LOG(LOG_ERROR,
"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. */
return -2;
}
LOG(LOG_ERROR,
"initialize_tls_session_client(): gnutls_init(): %s",
gnutls_strerror(result));
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
result = gnutls_priority_set(*session, tls_priority_cache);
LOG(LOG_ERROR,
"initialize_tls_session_client(): gnutls_priority_set(): %s",
gnutls_strerror(result));
+ gnutls_deinit(*session);
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
result = gnutls_credentials_set(*session,
LOG(LOG_ERROR,
"initialize_tls_session_client(): gnutls_credentials_set(): %s",
gnutls_strerror(result));
+ gnutls_deinit(*session);
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
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, tls_priority_cache);
LOG(LOG_ERROR,
"initialize_tls_session_server(): gnutls_priority_set(): %s",
gnutls_strerror(result));
+ gnutls_deinit(*session);
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
result = gnutls_credentials_set(*session,
LOG(LOG_ERROR,
"initialize_tls_session_server(): gnutls_credentials_set(): %s",
gnutls_strerror(result));
+ gnutls_deinit(*session);
+ gnutls_certificate_free_credentials(*x509_cred);
return -1;
}
fprintf(client_fd, "HTTP/1.0 503 Forwarding failure\r\n");
fprintf(client_fd, "\r\n");
}
+static void tls_send_invalid_cert_message(gnutls_session_t session) {
+ gnutls_record_send(session, "HTTP/1.0 500 Internal Server Error\r\n", 36);
+ gnutls_record_send(session, "\r\n", 2);
+}
-#if 0
/* Transfer data between client and server sockets until one closes the
* connection. */
static void transfer_data(int client, int server) {
ssize_t size_written;
char buffer[4096];
+ LOG(LOG_DEBUG, "read_from_write_to(): %d -> %d", from, to);
+
size_read = read(from, buffer, sizeof(buffer));
if (0 > size_read) {
LOG_PERROR(LOG_WARNING, "read_from_write_to(): read()");
return 0;
}
-#endif
/* Transfer data between client and server TLS connection until one closes the
* connection. */
ruderich.org/simon / tlsproxy / tlsproxy.git / blobdiff