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500 lines
16 KiB
C
500 lines
16 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) 2010, DirecTV
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* contact: Eric Hu <ehu@directv.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 http://curl.haxx.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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***************************************************************************/
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/*
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* Source file for all axTLS-specific code for the TLS/SSL layer. No code
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* but sslgen.c should ever call or use these functions.
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*/
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#include "setup.h"
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#ifdef USE_AXTLS
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#include <axTLS/ssl.h>
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#include "axtls.h"
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include "sendf.h"
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#include "inet_pton.h"
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#include "sslgen.h"
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#include "parsedate.h"
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#include "connect.h" /* for the connect timeout */
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#include "select.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/* SSL_read is opied from axTLS compat layer */
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static int SSL_read(SSL *ssl, void *buf, int num)
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{
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uint8_t *read_buf;
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int ret;
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while((ret = ssl_read(ssl, &read_buf)) == SSL_OK);
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if(ret > SSL_OK){
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memcpy(buf, read_buf, ret > num ? num : ret);
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}
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return ret;
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}
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/* Global axTLS init, called from Curl_ssl_init() */
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int Curl_axtls_init(void)
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{
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/* axTLS has no global init. Everything is done through SSL and SSL_CTX
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* structs stored in connectdata structure. Perhaps can move to axtls.h.
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*/
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return 1;
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}
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int Curl_axtls_cleanup(void)
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{
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/* axTLS has no global cleanup. Perhaps can move this to axtls.h. */
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return 1;
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}
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static CURLcode map_error_to_curl(int axtls_err)
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{
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switch (axtls_err) {
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case SSL_ERROR_NOT_SUPPORTED:
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case SSL_ERROR_INVALID_VERSION:
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case -70: /* protocol version alert from server */
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return CURLE_UNSUPPORTED_PROTOCOL;
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break;
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case SSL_ERROR_NO_CIPHER:
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return CURLE_SSL_CIPHER;
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break;
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case SSL_ERROR_BAD_CERTIFICATE: /* this may be bad server cert too */
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case SSL_ERROR_NO_CERT_DEFINED:
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case -42: /* bad certificate alert from server */
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case -43: /* unsupported cert alert from server */
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case -44: /* cert revoked alert from server */
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case -45: /* cert expired alert from server */
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case -46: /* cert unknown alert from server */
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return CURLE_SSL_CERTPROBLEM;
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break;
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case SSL_X509_ERROR(X509_NOT_OK):
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case SSL_X509_ERROR(X509_VFY_ERROR_NO_TRUSTED_CERT):
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case SSL_X509_ERROR(X509_VFY_ERROR_BAD_SIGNATURE):
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case SSL_X509_ERROR(X509_VFY_ERROR_NOT_YET_VALID):
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case SSL_X509_ERROR(X509_VFY_ERROR_EXPIRED):
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case SSL_X509_ERROR(X509_VFY_ERROR_SELF_SIGNED):
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case SSL_X509_ERROR(X509_VFY_ERROR_INVALID_CHAIN):
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case SSL_X509_ERROR(X509_VFY_ERROR_UNSUPPORTED_DIGEST):
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case SSL_X509_ERROR(X509_INVALID_PRIV_KEY):
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return CURLE_PEER_FAILED_VERIFICATION;
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break;
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case -48: /* unknown ca alert from server */
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return CURLE_SSL_CACERT;
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break;
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case -49: /* access denied alert from server */
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return CURLE_REMOTE_ACCESS_DENIED;
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break;
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case SSL_ERROR_CONN_LOST:
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case SSL_ERROR_SOCK_SETUP_FAILURE:
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case SSL_ERROR_INVALID_HANDSHAKE:
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case SSL_ERROR_INVALID_PROT_MSG:
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case SSL_ERROR_INVALID_HMAC:
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case SSL_ERROR_INVALID_SESSION:
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case SSL_ERROR_INVALID_KEY: /* it's too bad this doesn't map better */
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case SSL_ERROR_FINISHED_INVALID:
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case SSL_ERROR_NO_CLIENT_RENOG:
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default:
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return CURLE_SSL_CONNECT_ERROR;
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break;
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}
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}
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static Curl_recv axtls_recv;
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static Curl_send axtls_send;
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/*
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* This function is called after the TCP connect has completed. Setup the TLS
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* layer and do all necessary magic.
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*/
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CURLcode
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Curl_axtls_connect(struct connectdata *conn,
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int sockindex)
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{
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struct SessionHandle *data = conn->data;
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SSL_CTX *ssl_ctx;
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SSL *ssl;
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int cert_types[] = {SSL_OBJ_X509_CERT, SSL_OBJ_PKCS12, 0};
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int key_types[] = {SSL_OBJ_RSA_KEY, SSL_OBJ_PKCS8, SSL_OBJ_PKCS12, 0};
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int i, ssl_fcn_return;
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const uint8_t *ssl_sessionid;
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size_t ssl_idsize;
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const char *x509;
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/* Assuming users will not compile in custom key/cert to axTLS */
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uint32_t client_option = SSL_NO_DEFAULT_KEY|SSL_SERVER_VERIFY_LATER;
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if(conn->ssl[sockindex].state == ssl_connection_complete)
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/* to make us tolerant against being called more than once for the
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same connection */
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return CURLE_OK;
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/* axTLS only supports TLSv1 */
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/* check to see if we've been told to use an explicit SSL/TLS version */
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switch(data->set.ssl.version) {
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case CURL_SSLVERSION_DEFAULT:
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case CURL_SSLVERSION_TLSv1:
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break;
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default:
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failf(data, "axTLS only supports TLSv1");
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return CURLE_SSL_CONNECT_ERROR;
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}
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#ifdef AXTLSDEBUG
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client_option |= SSL_DISPLAY_STATES | SSL_DISPLAY_RSA | SSL_DISPLAY_CERTS;
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#endif /* AXTLSDEBUG */
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/* Allocate an SSL_CTX struct */
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ssl_ctx = ssl_ctx_new(client_option, SSL_DEFAULT_CLNT_SESS);
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if(ssl_ctx == NULL) {
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failf(data, "unable to create client SSL context");
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return CURLE_SSL_CONNECT_ERROR;
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}
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/* Load the trusted CA cert bundle file */
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if(data->set.ssl.CAfile) {
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if(ssl_obj_load(ssl_ctx, SSL_OBJ_X509_CACERT, data->set.ssl.CAfile, NULL)
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!= SSL_OK){
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infof(data, "error reading ca cert file %s \n",
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data->set.ssl.CAfile);
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if(data->set.ssl.verifypeer){
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Curl_axtls_close(conn, sockindex);
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return CURLE_SSL_CACERT_BADFILE;
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}
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}
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else
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infof(data, "found certificates in %s\n", data->set.ssl.CAfile);
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}
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/* gtls.c tasks we're skipping for now:
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* 1) certificate revocation list checking
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* 2) dns name assignment to host
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* 3) set protocol priority. axTLS is TLSv1 only, so can probably ignore
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* 4) set certificate priority. axTLS ignores type and sends certs in
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* order added. can probably ignore this.
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*/
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/* Load client certificate */
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if(data->set.str[STRING_CERT]){
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i=0;
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/* Instead of trying to analyze cert type here, let axTLS try them all. */
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while(cert_types[i] != 0){
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ssl_fcn_return = ssl_obj_load(ssl_ctx, cert_types[i],
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data->set.str[STRING_CERT], NULL);
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if(ssl_fcn_return == SSL_OK){
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infof(data, "successfully read cert file %s \n",
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data->set.str[STRING_CERT]);
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break;
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}
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i++;
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}
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/* Tried all cert types, none worked. */
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if(cert_types[i] == 0){
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failf(data, "%s is not x509 or pkcs12 format",
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data->set.str[STRING_CERT]);
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Curl_axtls_close(conn, sockindex);
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return CURLE_SSL_CERTPROBLEM;
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}
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}
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/* Load client key.
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If a pkcs12 file successfully loaded a cert, then there's nothing to do
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because the key has already been loaded. */
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if(data->set.str[STRING_KEY] && cert_types[i] != SSL_OBJ_PKCS12){
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i=0;
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/* Instead of trying to analyze key type here, let axTLS try them all. */
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while(key_types[i] != 0){
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ssl_fcn_return = ssl_obj_load(ssl_ctx, key_types[i],
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data->set.str[STRING_KEY], NULL);
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if(ssl_fcn_return == SSL_OK){
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infof(data, "successfully read key file %s \n",
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data->set.str[STRING_KEY]);
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break;
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}
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i++;
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}
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/* Tried all key types, none worked. */
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if(key_types[i] == 0){
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failf(data, "Failure: %s is not a supported key file",
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data->set.str[STRING_KEY]);
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Curl_axtls_close(conn, sockindex);
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return CURLE_SSL_CONNECT_ERROR;
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}
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}
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/* gtls.c does more here that is being left out for now
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* 1) set session credentials. can probably ignore since axtls puts this
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* info in the ssl_ctx struct
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* 2) setting up callbacks. these seem gnutls specific
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*/
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/* In axTLS, handshaking happens inside ssl_client_new. */
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if(!Curl_ssl_getsessionid(conn, (void **) &ssl_sessionid, &ssl_idsize)) {
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/* we got a session id, use it! */
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infof (data, "SSL re-using session ID\n");
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ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex],
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ssl_sessionid, (uint8_t)ssl_idsize);
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}
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else
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ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex], NULL, 0);
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/* Check to make sure handshake was ok. */
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ssl_fcn_return = ssl_handshake_status(ssl);
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if(ssl_fcn_return != SSL_OK){
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Curl_axtls_close(conn, sockindex);
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ssl_display_error(ssl_fcn_return); /* goes to stdout. */
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return map_error_to_curl(ssl_fcn_return);
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}
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infof (data, "handshake completed successfully\n");
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/* Here, gtls.c gets the peer certificates and fails out depending on
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* settings in "data." axTLS api doesn't have get cert chain fcn, so omit?
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*/
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/* Verify server's certificate */
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if(data->set.ssl.verifypeer){
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if(ssl_verify_cert(ssl) != SSL_OK){
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Curl_axtls_close(conn, sockindex);
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failf(data, "server cert verify failed");
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return CURLE_SSL_CONNECT_ERROR;
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}
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}
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else
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infof(data, "\t server certificate verification SKIPPED\n");
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/* Here, gtls.c does issuer verification. axTLS has no straightforward
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* equivalent, so omitting for now.*/
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/* See if common name was set in server certificate */
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x509 = ssl_get_cert_dn(ssl, SSL_X509_CERT_COMMON_NAME);
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if(x509 == NULL)
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infof(data, "error fetching CN from cert\n");
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/* Here, gtls.c does the following
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* 1) x509 hostname checking per RFC2818. axTLS doesn't support this, but
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* it seems useful. Omitting for now.
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* 2) checks cert validity based on time. axTLS does this in ssl_verify_cert
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* 3) displays a bunch of cert information. axTLS doesn't support most of
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* this, but a couple fields are available.
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*/
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/* General housekeeping */
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conn->ssl[sockindex].state = ssl_connection_complete;
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conn->ssl[sockindex].ssl = ssl;
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conn->ssl[sockindex].ssl_ctx = ssl_ctx;
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conn->recv[sockindex] = axtls_recv;
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conn->send[sockindex] = axtls_send;
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/* Put our freshly minted SSL session in cache */
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ssl_idsize = ssl_get_session_id_size(ssl);
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ssl_sessionid = ssl_get_session_id(ssl);
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if(Curl_ssl_addsessionid(conn, (void *) ssl_sessionid, ssl_idsize)
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!= CURLE_OK)
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infof (data, "failed to add session to cache\n");
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return CURLE_OK;
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}
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/* return number of sent (non-SSL) bytes */
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static ssize_t axtls_send(struct connectdata *conn,
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int sockindex,
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const void *mem,
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size_t len,
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CURLcode *err)
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{
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/* ssl_write() returns 'int' while write() and send() returns 'size_t' */
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int rc = ssl_write(conn->ssl[sockindex].ssl, mem, (int)len);
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infof(conn->data, " axtls_send\n");
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if(rc < 0 ) {
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*err = map_error_to_curl(rc);
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rc = -1; /* generic error code for send failure */
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}
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*err = CURLE_OK;
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return rc;
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}
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void Curl_axtls_close_all(struct SessionHandle *data)
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{
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(void)data;
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infof(data, " Curl_axtls_close_all\n");
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}
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void Curl_axtls_close(struct connectdata *conn, int sockindex)
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{
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struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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infof(conn->data, " Curl_axtls_close\n");
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if(connssl->ssl) {
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/* line from ssluse.c: (void)SSL_shutdown(connssl->ssl);
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axTLS compat layer does nothing for SSL_shutdown */
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/* The following line is from ssluse.c. There seems to be no axTLS
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equivalent. ssl_free and ssl_ctx_free close things.
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SSL_set_connect_state(connssl->handle); */
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ssl_free (connssl->ssl);
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connssl->ssl = NULL;
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}
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if(connssl->ssl_ctx) {
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ssl_ctx_free (connssl->ssl_ctx);
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connssl->ssl_ctx = NULL;
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}
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}
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/*
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* This function is called to shut down the SSL layer but keep the
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* socket open (CCC - Clear Command Channel)
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*/
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int Curl_axtls_shutdown(struct connectdata *conn, int sockindex)
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{
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/* Outline taken from ssluse.c since functions are in axTLS compat layer.
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axTLS's error set is much smaller, so a lot of error-handling was removed.
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*/
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int retval = 0;
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struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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struct SessionHandle *data = conn->data;
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char buf[120]; /* We will use this for the OpenSSL error buffer, so it has
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to be at least 120 bytes long. */
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ssize_t nread;
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infof(conn->data, " Curl_axtls_shutdown\n");
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/* This has only been tested on the proftpd server, and the mod_tls code
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sends a close notify alert without waiting for a close notify alert in
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response. Thus we wait for a close notify alert from the server, but
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we do not send one. Let's hope other servers do the same... */
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/* axTLS compat layer does nothing for SSL_shutdown, so we do nothing too
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if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
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(void)SSL_shutdown(connssl->ssl);
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*/
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if(connssl->ssl) {
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int what = Curl_socket_ready(conn->sock[sockindex],
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CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
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if(what > 0) {
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/* Something to read, let's do it and hope that it is the close
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notify alert from the server */
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nread = (ssize_t)SSL_read(conn->ssl[sockindex].ssl, buf,
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sizeof(buf));
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if(nread < SSL_OK){
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failf(data, "close notify alert not received during shutdown");
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retval = -1;
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}
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}
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else if(0 == what) {
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/* timeout */
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failf(data, "SSL shutdown timeout");
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}
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else {
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/* anything that gets here is fatally bad */
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failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
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retval = -1;
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}
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ssl_free (connssl->ssl);
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connssl->ssl = NULL;
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}
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return retval;
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}
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static ssize_t axtls_recv(struct connectdata *conn, /* connection data */
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int num, /* socketindex */
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char *buf, /* store read data here */
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size_t buffersize, /* max amount to read */
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CURLcode *err)
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{
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struct ssl_connect_data *connssl = &conn->ssl[num];
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ssize_t ret = 0;
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infof(conn->data, " axtls_recv\n");
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if(connssl){
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ret = (ssize_t)SSL_read(conn->ssl[num].ssl, buf, (int)buffersize);
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/* axTLS isn't terribly generous about error reporting */
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/* With patched axTLS, SSL_CLOSE_NOTIFY=-3. Hard-coding until axTLS
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team approves proposed fix. */
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if(ret == -3 ){
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Curl_axtls_close(conn, num);
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}
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else if(ret < 0) {
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failf(conn->data, "axTLS recv error (%d)", (int)ret);
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*err = map_error_to_curl(ret);
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return -1;
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}
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}
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*err = CURLE_OK;
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return ret;
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}
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/*
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* Return codes:
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* 1 means the connection is still in place
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* 0 means the connection has been closed
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* -1 means the connection status is unknown
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*/
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int Curl_axtls_check_cxn(struct connectdata *conn)
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{
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/* ssluse.c line: rc = SSL_peek(conn->ssl[FIRSTSOCKET].ssl, (void*)&buf, 1);
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axTLS compat layer always returns the last argument, so connection is
|
|
always alive? */
|
|
|
|
infof(conn->data, " Curl_axtls_check_cxn\n");
|
|
return 1; /* connection still in place */
|
|
}
|
|
|
|
void Curl_axtls_session_free(void *ptr)
|
|
{
|
|
(void)ptr;
|
|
/* free the ID */
|
|
/* both ssluse.c and gtls.c do something here, but axTLS's OpenSSL
|
|
compatibility layer does nothing, so we do nothing too. */
|
|
}
|
|
|
|
size_t Curl_axtls_version(char *buffer, size_t size)
|
|
{
|
|
return snprintf(buffer, size, "axTLS/%s", ssl_version());
|
|
}
|
|
|
|
#endif /* USE_AXTLS */
|