#include "connection.h"
#include "verify.h"
+#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <poll.h>
/* 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\
<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n\
<html>\n\
<head><title>%s</title></head>\n\
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);
LOG(WARNING, "read_http_request(): client EOF");
send_bad_request(client_fd_write);
goto out;
+ } else if (result == -3) {
+ LOG(DEBUG, "read_http_request(): proxy authentication failed");
+ send_authentication_required(client_fd_write);
+ goto out;
}
if (parse_request(buffer, host, port, &version_minor) != 0) {
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;
*/
static int read_http_request(FILE *client_fd, char *request, size_t length) {
char buffer[MAX_REQUEST_LINE];
+ int found_proxy_authorization;
if (fgets(request, (int)length, client_fd) == NULL) {
if (ferror(client_fd)) {
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;
return -1;
}
+ if (http_digest_authorization != NULL && !found_proxy_authorization) {
+ return -3;
+ }
+
return 0;
}
static void send_bad_request(FILE *client_fd) {
-#define RESPONSE_ERROR "400 Bad Request"
-#define RESPONSE_MSG "Your browser sent an invalid request."
- fprintf(client_fd, HTTP_RESPONSE_FORMAT,
- RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
- RESPONSE_MSG);
+ 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);
+ 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);
-#undef RESPONSE_ERROR
-#undef RESPONSE_MSG
}
static void send_forwarding_failure(FILE *client_fd) {
-#define RESPONSE_ERROR "503 Forwarding failure"
-#define RESPONSE_MSG "Failed to connect to server, check logs."
- fprintf(client_fd, HTTP_RESPONSE_FORMAT,
- RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
- RESPONSE_MSG);
+ 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);
fflush(client_fd);
-#undef RESPONSE_ERROR
-#undef RESPONSE_MSG
}
static void tls_send_invalid_cert_message(gnutls_session_t session) {
-#define RESPONSE_ERROR "500 Internal Server Error"
-#define RESPONSE_MSG "Server certificate validation failed, check logs."
+ const char error[] = "500 Internal Server Error";
+ const char msg[] = "Server certificate validation failed, check logs.";
int result;
- char buffer[sizeof(HTTP_RESPONSE_FORMAT) - 1 /* '\0' */
- - 4 * 2 /* four %s */
- + (sizeof(RESPONSE_ERROR) - 1 /* '\0' */) * 3
- + sizeof(RESPONSE_MSG) - 1 /* '\0' */
- + 1 /* '\0' */];
-
- result = snprintf(buffer, sizeof(buffer),
- HTTP_RESPONSE_FORMAT,
- RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
- RESPONSE_MSG);
- if (result < 0) {
- LOG_PERROR(ERROR,
- "tls_send_invalid_cert_message(): snprintf failed");
- return;
- } else if ((size_t)result >= sizeof(buffer)) {
- LOG(ERROR,
- "tls_send_invalid_cert_message(): snprintf buffer too short");
- return;
- }
+ char buffer[sizeof(HTTP_RESPONSE_FORMAT)
+ + 3 * sizeof(error) + sizeof(msg)];
+
+ result = snprintf(buffer, sizeof(buffer), HTTP_RESPONSE_FORMAT,
+ error, "", error, error, msg);
+ assert(result > 0 && (size_t)result < sizeof(buffer));
- gnutls_record_send(session, buffer, sizeof(buffer) - 1);
- /* don't send trailing '\0' */
-#undef RESPONSE_ERROR
-#undef RESPONSE_MSG
+ gnutls_record_send(session, buffer, strlen(buffer));
}
server_socket = socket(server->ai_family,
server->ai_socktype,
server->ai_protocol);
- if (server_socket == -1) {
+ if (server_socket < 0) {
LOG_PERROR(DEBUG, "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");
ruderich.org/simon / tlsproxy / tlsproxy.git / blobdiff