537 lines
20 KiB
C
537 lines
20 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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* Copyright (C) Markus Moeller, <markus_moeller@compuserve.com>
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_PROXY)
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#include "curl_gssapi.h"
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#include "urldata.h"
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#include "sendf.h"
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#include "cfilters.h"
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#include "connect.h"
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#include "timeval.h"
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#include "socks.h"
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#include "warnless.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
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/*
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* Helper GSS-API error functions.
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*/
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static int check_gss_err(struct Curl_easy *data,
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OM_uint32 major_status,
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OM_uint32 minor_status,
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const char *function)
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{
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if(GSS_ERROR(major_status)) {
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OM_uint32 maj_stat, min_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status_string = GSS_C_EMPTY_BUFFER;
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char buf[1024];
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size_t len;
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len = 0;
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msg_ctx = 0;
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while(!msg_ctx) {
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/* convert major status code (GSS-API error) to text */
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maj_stat = gss_display_status(&min_stat, major_status,
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GSS_C_GSS_CODE,
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GSS_C_NULL_OID,
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&msg_ctx, &status_string);
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if(maj_stat == GSS_S_COMPLETE) {
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if(sizeof(buf) > len + status_string.length + 1) {
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strcpy(buf + len, (char *) status_string.value);
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len += status_string.length;
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}
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gss_release_buffer(&min_stat, &status_string);
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break;
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}
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gss_release_buffer(&min_stat, &status_string);
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}
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if(sizeof(buf) > len + 3) {
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strcpy(buf + len, ".\n");
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len += 2;
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}
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msg_ctx = 0;
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while(!msg_ctx) {
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/* convert minor status code (underlying routine error) to text */
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maj_stat = gss_display_status(&min_stat, minor_status,
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GSS_C_MECH_CODE,
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GSS_C_NULL_OID,
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&msg_ctx, &status_string);
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if(maj_stat == GSS_S_COMPLETE) {
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if(sizeof(buf) > len + status_string.length)
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strcpy(buf + len, (char *) status_string.value);
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gss_release_buffer(&min_stat, &status_string);
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break;
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}
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gss_release_buffer(&min_stat, &status_string);
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}
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failf(data, "GSS-API error: %s failed: %s", function, buf);
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return 1;
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}
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return 0;
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}
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CURLcode Curl_SOCKS5_gssapi_negotiate(struct Curl_cfilter *cf,
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struct Curl_easy *data)
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{
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struct connectdata *conn = cf->conn;
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curl_socket_t sock = conn->sock[cf->sockindex];
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CURLcode code;
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ssize_t actualread;
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ssize_t nwritten;
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int result;
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OM_uint32 gss_major_status, gss_minor_status, gss_status;
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OM_uint32 gss_ret_flags;
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int gss_conf_state, gss_enc;
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gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc gss_send_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc gss_recv_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc gss_w_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc *gss_token = GSS_C_NO_BUFFER;
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gss_name_t server = GSS_C_NO_NAME;
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gss_name_t gss_client_name = GSS_C_NO_NAME;
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unsigned short us_length;
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char *user = NULL;
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unsigned char socksreq[4]; /* room for GSS-API exchange header only */
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const char *serviceptr = data->set.str[STRING_PROXY_SERVICE_NAME] ?
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data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd";
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const size_t serviceptr_length = strlen(serviceptr);
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/* GSS-API request looks like
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* +----+------+-----+----------------+
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* |VER | MTYP | LEN | TOKEN |
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* +----+------+----------------------+
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* | 1 | 1 | 2 | up to 2^16 - 1 |
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* +----+------+-----+----------------+
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*/
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/* prepare service name */
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if(strchr(serviceptr, '/')) {
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service.length = serviceptr_length;
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service.value = malloc(service.length);
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if(!service.value)
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return CURLE_OUT_OF_MEMORY;
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memcpy(service.value, serviceptr, service.length);
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gss_major_status = gss_import_name(&gss_minor_status, &service,
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(gss_OID) GSS_C_NULL_OID, &server);
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}
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else {
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service.value = malloc(serviceptr_length +
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strlen(conn->socks_proxy.host.name) + 2);
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if(!service.value)
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return CURLE_OUT_OF_MEMORY;
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service.length = serviceptr_length +
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strlen(conn->socks_proxy.host.name) + 1;
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msnprintf(service.value, service.length + 1, "%s@%s",
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serviceptr, conn->socks_proxy.host.name);
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gss_major_status = gss_import_name(&gss_minor_status, &service,
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GSS_C_NT_HOSTBASED_SERVICE, &server);
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}
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gss_release_buffer(&gss_status, &service); /* clear allocated memory */
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if(check_gss_err(data, gss_major_status,
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gss_minor_status, "gss_import_name()")) {
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failf(data, "Failed to create service name.");
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gss_release_name(&gss_status, &server);
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return CURLE_COULDNT_CONNECT;
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}
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(void)curlx_nonblock(sock, FALSE);
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/* As long as we need to keep sending some context info, and there's no */
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/* errors, keep sending it... */
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for(;;) {
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gss_major_status = Curl_gss_init_sec_context(data,
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&gss_minor_status,
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&gss_context,
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server,
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&Curl_krb5_mech_oid,
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NULL,
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gss_token,
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&gss_send_token,
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TRUE,
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&gss_ret_flags);
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if(gss_token != GSS_C_NO_BUFFER)
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gss_release_buffer(&gss_status, &gss_recv_token);
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if(check_gss_err(data, gss_major_status,
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gss_minor_status, "gss_init_sec_context")) {
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gss_release_name(&gss_status, &server);
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gss_release_buffer(&gss_status, &gss_recv_token);
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gss_release_buffer(&gss_status, &gss_send_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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failf(data, "Failed to initial GSS-API token.");
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return CURLE_COULDNT_CONNECT;
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}
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if(gss_send_token.length) {
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socksreq[0] = 1; /* GSS-API subnegotiation version */
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socksreq[1] = 1; /* authentication message type */
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us_length = htons((short)gss_send_token.length);
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memcpy(socksreq + 2, &us_length, sizeof(short));
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nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 4, &code);
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if(code || (4 != nwritten)) {
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failf(data, "Failed to send GSS-API authentication request.");
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gss_release_name(&gss_status, &server);
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gss_release_buffer(&gss_status, &gss_recv_token);
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gss_release_buffer(&gss_status, &gss_send_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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nwritten = Curl_conn_cf_send(cf->next, data,
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(char *)gss_send_token.value,
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gss_send_token.length, &code);
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if(code || ((ssize_t)gss_send_token.length != nwritten)) {
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failf(data, "Failed to send GSS-API authentication token.");
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gss_release_name(&gss_status, &server);
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gss_release_buffer(&gss_status, &gss_recv_token);
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gss_release_buffer(&gss_status, &gss_send_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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}
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gss_release_buffer(&gss_status, &gss_send_token);
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gss_release_buffer(&gss_status, &gss_recv_token);
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if(gss_major_status != GSS_S_CONTINUE_NEEDED)
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break;
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/* analyse response */
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/* GSS-API response looks like
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* +----+------+-----+----------------+
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* |VER | MTYP | LEN | TOKEN |
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* +----+------+----------------------+
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* | 1 | 1 | 2 | up to 2^16 - 1 |
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* +----+------+-----+----------------+
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*/
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result = Curl_blockread_all(cf, data, (char *)socksreq, 4, &actualread);
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if(result || (actualread != 4)) {
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failf(data, "Failed to receive GSS-API authentication response.");
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gss_release_name(&gss_status, &server);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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/* ignore the first (VER) byte */
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if(socksreq[1] == 255) { /* status / message type */
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failf(data, "User was rejected by the SOCKS5 server (%d %d).",
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socksreq[0], socksreq[1]);
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gss_release_name(&gss_status, &server);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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if(socksreq[1] != 1) { /* status / message type */
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failf(data, "Invalid GSS-API authentication response type (%d %d).",
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socksreq[0], socksreq[1]);
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gss_release_name(&gss_status, &server);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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memcpy(&us_length, socksreq + 2, sizeof(short));
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us_length = ntohs(us_length);
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gss_recv_token.length = us_length;
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gss_recv_token.value = malloc(us_length);
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if(!gss_recv_token.value) {
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failf(data,
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"Could not allocate memory for GSS-API authentication "
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"response token.");
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gss_release_name(&gss_status, &server);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_OUT_OF_MEMORY;
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}
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result = Curl_blockread_all(cf, data, (char *)gss_recv_token.value,
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gss_recv_token.length, &actualread);
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if(result || (actualread != us_length)) {
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failf(data, "Failed to receive GSS-API authentication token.");
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gss_release_name(&gss_status, &server);
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gss_release_buffer(&gss_status, &gss_recv_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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gss_token = &gss_recv_token;
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}
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gss_release_name(&gss_status, &server);
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/* Everything is good so far, user was authenticated! */
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gss_major_status = gss_inquire_context(&gss_minor_status, gss_context,
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&gss_client_name, NULL, NULL, NULL,
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NULL, NULL, NULL);
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if(check_gss_err(data, gss_major_status,
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gss_minor_status, "gss_inquire_context")) {
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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gss_release_name(&gss_status, &gss_client_name);
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failf(data, "Failed to determine user name.");
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return CURLE_COULDNT_CONNECT;
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}
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gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
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&gss_send_token, NULL);
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if(check_gss_err(data, gss_major_status,
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gss_minor_status, "gss_display_name")) {
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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gss_release_name(&gss_status, &gss_client_name);
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gss_release_buffer(&gss_status, &gss_send_token);
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failf(data, "Failed to determine user name.");
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return CURLE_COULDNT_CONNECT;
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}
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user = malloc(gss_send_token.length + 1);
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if(!user) {
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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gss_release_name(&gss_status, &gss_client_name);
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gss_release_buffer(&gss_status, &gss_send_token);
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return CURLE_OUT_OF_MEMORY;
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}
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memcpy(user, gss_send_token.value, gss_send_token.length);
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user[gss_send_token.length] = '\0';
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gss_release_name(&gss_status, &gss_client_name);
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gss_release_buffer(&gss_status, &gss_send_token);
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infof(data, "SOCKS5 server authenticated user %s with GSS-API.",user);
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free(user);
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user = NULL;
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/* Do encryption */
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socksreq[0] = 1; /* GSS-API subnegotiation version */
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socksreq[1] = 2; /* encryption message type */
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gss_enc = 0; /* no data protection */
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/* do confidentiality protection if supported */
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if(gss_ret_flags & GSS_C_CONF_FLAG)
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gss_enc = 2;
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/* else do integrity protection */
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else if(gss_ret_flags & GSS_C_INTEG_FLAG)
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gss_enc = 1;
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infof(data, "SOCKS5 server supports GSS-API %s data protection.",
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(gss_enc == 0)?"no":((gss_enc==1)?"integrity":"confidentiality"));
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/* force for the moment to no data protection */
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gss_enc = 0;
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/*
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* Sending the encryption type in clear seems wrong. It should be
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* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
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* The NEC reference implementations on which this is based is
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* therefore at fault
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*
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* +------+------+------+.......................+
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* + ver | mtyp | len | token |
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* +------+------+------+.......................+
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* + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
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* +------+------+------+.......................+
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*
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* Where:
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*
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* - "ver" is the protocol version number, here 1 to represent the
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* first version of the SOCKS/GSS-API protocol
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*
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* - "mtyp" is the message type, here 2 to represent a protection
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* -level negotiation message
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*
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* - "len" is the length of the "token" field in octets
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*
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* - "token" is the GSS-API encapsulated protection level
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*
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* The token is produced by encapsulating an octet containing the
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* required protection level using gss_seal()/gss_wrap() with conf_req
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* set to FALSE. The token is verified using gss_unseal()/
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* gss_unwrap().
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*
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*/
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if(data->set.socks5_gssapi_nec) {
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us_length = htons((short)1);
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memcpy(socksreq + 2, &us_length, sizeof(short));
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}
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else {
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gss_send_token.length = 1;
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gss_send_token.value = malloc(1);
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if(!gss_send_token.value) {
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_OUT_OF_MEMORY;
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}
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memcpy(gss_send_token.value, &gss_enc, 1);
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gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
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GSS_C_QOP_DEFAULT, &gss_send_token,
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&gss_conf_state, &gss_w_token);
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if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_wrap")) {
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gss_release_buffer(&gss_status, &gss_send_token);
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gss_release_buffer(&gss_status, &gss_w_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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failf(data, "Failed to wrap GSS-API encryption value into token.");
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return CURLE_COULDNT_CONNECT;
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}
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gss_release_buffer(&gss_status, &gss_send_token);
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us_length = htons((short)gss_w_token.length);
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memcpy(socksreq + 2, &us_length, sizeof(short));
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}
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nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 4, &code);
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if(code || (4 != nwritten)) {
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failf(data, "Failed to send GSS-API encryption request.");
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gss_release_buffer(&gss_status, &gss_w_token);
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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if(data->set.socks5_gssapi_nec) {
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memcpy(socksreq, &gss_enc, 1);
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nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 1, &code);
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if(code || ( 1 != nwritten)) {
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failf(data, "Failed to send GSS-API encryption type.");
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gss_delete_sec_context(&gss_status, &gss_context, NULL);
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return CURLE_COULDNT_CONNECT;
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}
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}
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else {
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nwritten = Curl_conn_cf_send(cf->next, data,
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(char *)gss_w_token.value,
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gss_w_token.length, &code);
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if(code || ((ssize_t)gss_w_token.length != nwritten)) {
|
|
failf(data, "Failed to send GSS-API encryption type.");
|
|
gss_release_buffer(&gss_status, &gss_w_token);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
gss_release_buffer(&gss_status, &gss_w_token);
|
|
}
|
|
|
|
result = Curl_blockread_all(cf, data, (char *)socksreq, 4, &actualread);
|
|
if(result || (actualread != 4)) {
|
|
failf(data, "Failed to receive GSS-API encryption response.");
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
/* ignore the first (VER) byte */
|
|
if(socksreq[1] == 255) { /* status / message type */
|
|
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
|
|
socksreq[0], socksreq[1]);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
if(socksreq[1] != 2) { /* status / message type */
|
|
failf(data, "Invalid GSS-API encryption response type (%d %d).",
|
|
socksreq[0], socksreq[1]);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
memcpy(&us_length, socksreq + 2, sizeof(short));
|
|
us_length = ntohs(us_length);
|
|
|
|
gss_recv_token.length = us_length;
|
|
gss_recv_token.value = malloc(gss_recv_token.length);
|
|
if(!gss_recv_token.value) {
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
result = Curl_blockread_all(cf, data, (char *)gss_recv_token.value,
|
|
gss_recv_token.length, &actualread);
|
|
|
|
if(result || (actualread != us_length)) {
|
|
failf(data, "Failed to receive GSS-API encryptrion type.");
|
|
gss_release_buffer(&gss_status, &gss_recv_token);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
if(!data->set.socks5_gssapi_nec) {
|
|
gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
|
|
&gss_recv_token, &gss_w_token,
|
|
0, GSS_C_QOP_DEFAULT);
|
|
|
|
if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_unwrap")) {
|
|
gss_release_buffer(&gss_status, &gss_recv_token);
|
|
gss_release_buffer(&gss_status, &gss_w_token);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
failf(data, "Failed to unwrap GSS-API encryption value into token.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
gss_release_buffer(&gss_status, &gss_recv_token);
|
|
|
|
if(gss_w_token.length != 1) {
|
|
failf(data, "Invalid GSS-API encryption response length (%zu).",
|
|
gss_w_token.length);
|
|
gss_release_buffer(&gss_status, &gss_w_token);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
memcpy(socksreq, gss_w_token.value, gss_w_token.length);
|
|
gss_release_buffer(&gss_status, &gss_w_token);
|
|
}
|
|
else {
|
|
if(gss_recv_token.length != 1) {
|
|
failf(data, "Invalid GSS-API encryption response length (%zu).",
|
|
gss_recv_token.length);
|
|
gss_release_buffer(&gss_status, &gss_recv_token);
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
memcpy(socksreq, gss_recv_token.value, gss_recv_token.length);
|
|
gss_release_buffer(&gss_status, &gss_recv_token);
|
|
}
|
|
|
|
(void)curlx_nonblock(sock, TRUE);
|
|
|
|
infof(data, "SOCKS5 access with%s protection granted.",
|
|
(socksreq[0] == 0)?"out GSS-API data":
|
|
((socksreq[0] == 1)?" GSS-API integrity":" GSS-API confidentiality"));
|
|
|
|
conn->socks5_gssapi_enctype = socksreq[0];
|
|
if(socksreq[0] == 0)
|
|
gss_delete_sec_context(&gss_status, &gss_context, NULL);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
#endif /* HAVE_GSSAPI && !CURL_DISABLE_PROXY */
|