axtls: removed

As has been outlined in the DEPRECATE.md document, the axTLS code has
been disabled for 6 months and is hereby removed.

Use a better supported TLS library!

Assisted-by: Daniel Gustafsson
Closes #3194

9 files changed, 6 insertions, 817 deletions

diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index 4aa042259..54acd6cea 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -28,12 +28,12 @@ LIB_VAUTH_CFILES = vauth/vauth.c vauth/cleartext.c vauth/cram.c         \
 LIB_VAUTH_HFILES = vauth/vauth.h vauth/digest.h vauth/ntlm.h
 
 LIB_VTLS_CFILES = vtls/openssl.c vtls/gtls.c vtls/vtls.c vtls/nss.c     \
-  vtls/polarssl.c vtls/polarssl_threadlock.c vtls/axtls.c               \
+  vtls/polarssl.c vtls/polarssl_threadlock.c                            \
   vtls/cyassl.c vtls/schannel.c vtls/schannel_verify.c                  \
   vtls/darwinssl.c vtls/gskit.c vtls/mbedtls.c vtls/mesalink.c
 
 LIB_VTLS_HFILES = vtls/openssl.h vtls/vtls.h vtls/gtls.h                \
-  vtls/nssg.h vtls/polarssl.h vtls/polarssl_threadlock.h vtls/axtls.h   \
+  vtls/nssg.h vtls/polarssl.h vtls/polarssl_threadlock.h                \
   vtls/cyassl.h vtls/schannel.h vtls/darwinssl.h vtls/gskit.h           \
   vtls/mbedtls.h vtls/mesalink.h
 
diff --git a/lib/Makefile.netware b/lib/Makefile.netware
index fa6beec00..adf4c60c3 100644
--- a/lib/Makefile.netware
+++ b/lib/Makefile.netware
@@ -6,7 +6,7 @@
 #                             \___|\___/|_| \_\_____|
 #
 # Copyright (C) 2004 - 2015, Guenter Knauf
-# Copyright (C) 2001 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 2001 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -49,11 +49,6 @@ ifndef LIBSSH2_PATH
 LIBSSH2_PATH = ../../libssh2-1.5.0
 endif
 
-# Edit the path below to point to the base of your axTLS package.
-ifndef AXTLS_PATH
-AXTLS_PATH = ../../axTLS-1.2.7
-endif
-
 # Edit the path below to point to the base of your libidn package.
 ifndef LIBIDN_PATH
 LIBIDN_PATH = ../../libidn-1.18
@@ -230,10 +225,6 @@ WITH_SSH2 = 1
 WITH_SSL = 1
 WITH_ZLIB = 1
 endif
-ifeq ($(findstring -axtls,$(CFG)),-axtls)
-WITH_AXTLS = 1
-WITH_SSL =
-else
 ifeq ($(findstring -ssl,$(CFG)),-ssl)
 WITH_SSL = 1
 ifeq ($(findstring -srp,$(CFG)),-srp)
@@ -242,7 +233,6 @@ WITH_SRP = 1
 endif
 endif
 endif
-endif
 ifeq ($(findstring -zlib,$(CFG)),-zlib)
 WITH_ZLIB = 1
 endif
@@ -280,16 +270,6 @@ ifdef WITH_SSL
   IMPORTS += GetProcessSwitchCount RunningProcess
   INSTDEP += ca-bundle.crt
 else
-ifdef WITH_AXTLS
-  INCLUDES += -I$(AXTLS_PATH)/inc
-  ifdef LINK_STATIC
-    LDLIBS += $(AXTLS_PATH)/lib/libaxtls.$(LIBEXT)
-  else
-    MODULES += libaxtls.nlm
-    IMPORTS += $(AXTLS_PATH)/lib/libaxtls.imp
-  endif
-  INSTDEP += ca-bundle.crt
-endif
 endif
 ifdef WITH_ZLIB
   INCLUDES += -I$(ZLIB_PATH)
@@ -672,9 +652,6 @@ ifdef WITH_SPNEGO
 	@echo $(DL)#define HAVE_SPNEGO 1$(DL) >> $@
 endif
 else
-ifdef WITH_AXTLS
-	@echo $(DL)#define USE_AXTLS 1$(DL) >> $@
-endif
 endif
 ifdef WITH_SSH2
 	@echo $(DL)#define USE_LIBSSH2 1$(DL) >> $@
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index b84501556..f83e1ea4f 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -646,7 +646,7 @@ int netware_init(void);
 #define LIBIDN_REQUIRED_VERSION "0.4.1"
 
 #if defined(USE_GNUTLS) || defined(USE_OPENSSL) || defined(USE_NSS) || \
-    defined(USE_POLARSSL) || defined(USE_AXTLS) || defined(USE_MBEDTLS) || \
+    defined(USE_POLARSSL) || defined(USE_MBEDTLS) || \
     defined(USE_CYASSL) || defined(USE_SCHANNEL) || \
     defined(USE_DARWINSSL) || defined(USE_GSKIT) || defined(USE_MESALINK)
 #define USE_SSL    /* SSL support has been enabled */
diff --git a/lib/hostcheck.c b/lib/hostcheck.c
index c9d8112d8..6fcd0a901 100644
--- a/lib/hostcheck.c
+++ b/lib/hostcheck.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -23,7 +23,6 @@
 #include "curl_setup.h"
 
 #if defined(USE_OPENSSL)                                \
-  || defined(USE_AXTLS)                                 \
   || defined(USE_GSKIT)                                 \
   || defined(USE_SCHANNEL)
 /* these backends use functions from this file */
@@ -150,4 +149,4 @@ int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
   return res;
 }
 
-#endif /* OPENSSL, AXTLS, GSKIT or schannel+wince */
+#endif /* OPENSSL, GSKIT or schannel+wince */
diff --git a/lib/md5.c b/lib/md5.c
index 45f45bbd9..a17a58fa6 100644
--- a/lib/md5.c
+++ b/lib/md5.c
@@ -163,13 +163,6 @@ static void MD5_Final(unsigned char digest[16], MD5_CTX *ctx)
     CryptReleaseContext(ctx->hCryptProv, 0);
 }
 
-#elif defined(USE_AXTLS)
-#include <axTLS/config.h>
-#include <axTLS/os_int.h>
-#include <axTLS/crypto.h>
-#include "curl_memory.h"
-/* The last #include file should be: */
-#include "memdebug.h"
 #else
 /* When no other crypto library is available we use this code segment */
 /*
diff --git a/lib/vtls/axtls.c b/lib/vtls/axtls.c
deleted file mode 100644
index b262392a0..000000000
--- a/lib/vtls/axtls.c
+++ /dev/null
@@ -1,741 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2010, DirecTV, Contact: Eric Hu, <ehu@directv.com>.
- * Copyright (C) 2010 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/*
- * Source file for all axTLS-specific code for the TLS/SSL layer. No code
- * but vtls.c should ever call or use these functions.
- */
-
-#include "curl_setup.h"
-
-#ifdef USE_AXTLS
-
-#error axTLS support has been disabled in curl due to doubts about quality,
-#error user dedication and a lack of use/testing. We urge users to consider
-#error using a more established TLS backend instead.
-
-#include <axTLS/config.h>
-#include <axTLS/ssl.h>
-#include "axtls.h"
-
-#include "sendf.h"
-#include "inet_pton.h"
-#include "vtls.h"
-#include "parsedate.h"
-#include "connect.h" /* for the connect timeout */
-#include "select.h"
-#include "curl_printf.h"
-#include "hostcheck.h"
-#include <unistd.h>
-
-/* The last #include files should be: */
-#include "curl_memory.h"
-#include "memdebug.h"
-
-struct ssl_backend_data {
-  SSL_CTX* ssl_ctx;
-  SSL*     ssl;
-};
-
-#define BACKEND connssl->backend
-
-static CURLcode map_error_to_curl(int axtls_err)
-{
-  switch(axtls_err) {
-  case SSL_ERROR_NOT_SUPPORTED:
-  case SSL_ERROR_INVALID_VERSION:
-  case -70:                       /* protocol version alert from server */
-    return CURLE_UNSUPPORTED_PROTOCOL;
-    break;
-  case SSL_ERROR_NO_CIPHER:
-    return CURLE_SSL_CIPHER;
-    break;
-  case SSL_ERROR_BAD_CERTIFICATE: /* this may be bad server cert too */
-  case SSL_ERROR_NO_CERT_DEFINED:
-  case -42:                       /* bad certificate alert from server */
-  case -43:                       /* unsupported cert alert from server */
-  case -44:                       /* cert revoked alert from server */
-  case -45:                       /* cert expired alert from server */
-  case -46:                       /* cert unknown alert from server */
-    return CURLE_SSL_CERTPROBLEM;
-    break;
-  case SSL_X509_ERROR(X509_NOT_OK):
-  case SSL_X509_ERROR(X509_VFY_ERROR_NO_TRUSTED_CERT):
-  case SSL_X509_ERROR(X509_VFY_ERROR_BAD_SIGNATURE):
-  case SSL_X509_ERROR(X509_VFY_ERROR_NOT_YET_VALID):
-  case SSL_X509_ERROR(X509_VFY_ERROR_EXPIRED):
-  case SSL_X509_ERROR(X509_VFY_ERROR_SELF_SIGNED):
-  case SSL_X509_ERROR(X509_VFY_ERROR_INVALID_CHAIN):
-  case SSL_X509_ERROR(X509_VFY_ERROR_UNSUPPORTED_DIGEST):
-  case SSL_X509_ERROR(X509_INVALID_PRIV_KEY):
-    return CURLE_PEER_FAILED_VERIFICATION;
-    break;
-  case -48:                       /* unknown ca alert from server */
-    return CURLE_SSL_CACERT;
-    break;
-  case -49:                       /* access denied alert from server */
-    return CURLE_REMOTE_ACCESS_DENIED;
-    break;
-  case SSL_ERROR_CONN_LOST:
-  case SSL_ERROR_SOCK_SETUP_FAILURE:
-  case SSL_ERROR_INVALID_HANDSHAKE:
-  case SSL_ERROR_INVALID_PROT_MSG:
-  case SSL_ERROR_INVALID_HMAC:
-  case SSL_ERROR_INVALID_SESSION:
-  case SSL_ERROR_INVALID_KEY:     /* it's too bad this doesn't map better */
-  case SSL_ERROR_FINISHED_INVALID:
-  case SSL_ERROR_NO_CLIENT_RENOG:
-  default:
-    return CURLE_SSL_CONNECT_ERROR;
-    break;
-  }
-}
-
-static Curl_recv axtls_recv;
-static Curl_send axtls_send;
-
-static void free_ssl_structs(struct ssl_connect_data *connssl)
-{
-  if(BACKEND->ssl) {
-    ssl_free(BACKEND->ssl);
-    BACKEND->ssl = NULL;
-  }
-  if(BACKEND->ssl_ctx) {
-    ssl_ctx_free(BACKEND->ssl_ctx);
-    BACKEND->ssl_ctx = NULL;
-  }
-}
-
-/*
- * For both blocking and non-blocking connects, this function sets up the
- * ssl context and state.  This function is called after the TCP connect
- * has completed.
- */
-static CURLcode connect_prep(struct connectdata *conn, int sockindex)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct Curl_easy *data = conn->data;
-  SSL_CTX *ssl_ctx;
-  SSL *ssl = NULL;
-  int cert_types[] = {SSL_OBJ_X509_CERT, SSL_OBJ_PKCS12, 0};
-  int key_types[] = {SSL_OBJ_RSA_KEY, SSL_OBJ_PKCS8, SSL_OBJ_PKCS12, 0};
-  int i, ssl_fcn_return;
-
-  /* Assuming users will not compile in custom key/cert to axTLS.
-  *  Also, even for blocking connects, use axTLS non-blocking feature.
-  */
-  uint32_t client_option = SSL_NO_DEFAULT_KEY |
-    SSL_SERVER_VERIFY_LATER |
-    SSL_CONNECT_IN_PARTS;
-
-  if(connssl->state == ssl_connection_complete)
-    /* to make us tolerant against being called more than once for the
-       same connection */
-    return CURLE_OK;
-
-  if(SSL_CONN_CONFIG(version_max) != CURL_SSLVERSION_MAX_NONE) {
-    failf(data, "axtls does not support CURL_SSLVERSION_MAX");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-
-  /* axTLS only supports TLSv1 */
-  /* check to see if we've been told to use an explicit SSL/TLS version */
-  switch(SSL_CONN_CONFIG(version)) {
-  case CURL_SSLVERSION_DEFAULT:
-  case CURL_SSLVERSION_TLSv1:
-    break;
-  default:
-    failf(data, "axTLS only supports TLS 1.0 and 1.1, "
-          "and it cannot be specified which one to use");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-#ifdef  AXTLSDEBUG
-  client_option |= SSL_DISPLAY_STATES | SSL_DISPLAY_RSA | SSL_DISPLAY_CERTS;
-#endif /* AXTLSDEBUG */
-
-  /* Allocate an SSL_CTX struct */
-  ssl_ctx = ssl_ctx_new(client_option, SSL_DEFAULT_CLNT_SESS);
-  if(ssl_ctx == NULL) {
-    failf(data, "unable to create client SSL context");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  BACKEND->ssl_ctx = ssl_ctx;
-  BACKEND->ssl = NULL;
-
-  /* Load the trusted CA cert bundle file */
-  if(SSL_CONN_CONFIG(CAfile)) {
-    if(ssl_obj_load(ssl_ctx, SSL_OBJ_X509_CACERT,
-                    SSL_CONN_CONFIG(CAfile), NULL) != SSL_OK) {
-      infof(data, "error reading ca cert file %s \n",
-            SSL_CONN_CONFIG(CAfile));
-      if(SSL_CONN_CONFIG(verifypeer)) {
-        return CURLE_SSL_CACERT_BADFILE;
-      }
-    }
-    else
-      infof(data, "found certificates in %s\n", SSL_CONN_CONFIG(CAfile));
-  }
-
-  /* gtls.c tasks we're skipping for now:
-   * 1) certificate revocation list checking
-   * 2) dns name assignment to host
-   * 3) set protocol priority.  axTLS is TLSv1 only, so can probably ignore
-   * 4) set certificate priority.  axTLS ignores type and sends certs in
-   *  order added.  can probably ignore this.
-   */
-
-  /* Load client certificate */
-  if(SSL_SET_OPTION(cert)) {
-    i = 0;
-    /* Instead of trying to analyze cert type here, let axTLS try them all. */
-    while(cert_types[i] != 0) {
-      ssl_fcn_return = ssl_obj_load(ssl_ctx, cert_types[i],
-                                    SSL_SET_OPTION(cert), NULL);
-      if(ssl_fcn_return == SSL_OK) {
-        infof(data, "successfully read cert file %s \n",
-              SSL_SET_OPTION(cert));
-        break;
-      }
-      i++;
-    }
-    /* Tried all cert types, none worked. */
-    if(cert_types[i] == 0) {
-      failf(data, "%s is not x509 or pkcs12 format",
-            SSL_SET_OPTION(cert));
-      return CURLE_SSL_CERTPROBLEM;
-    }
-  }
-
-  /* Load client key.
-     If a pkcs12 file successfully loaded a cert, then there's nothing to do
-     because the key has already been loaded. */
-  if(SSL_SET_OPTION(key) && cert_types[i] != SSL_OBJ_PKCS12) {
-    i = 0;
-    /* Instead of trying to analyze key type here, let axTLS try them all. */
-    while(key_types[i] != 0) {
-      ssl_fcn_return = ssl_obj_load(ssl_ctx, key_types[i],
-                                    SSL_SET_OPTION(key), NULL);
-      if(ssl_fcn_return == SSL_OK) {
-        infof(data, "successfully read key file %s \n",
-              SSL_SET_OPTION(key));
-        break;
-      }
-      i++;
-    }
-    /* Tried all key types, none worked. */
-    if(key_types[i] == 0) {
-      failf(data, "Failure: %s is not a supported key file",
-            SSL_SET_OPTION(key));
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-  }
-
-  /* gtls.c does more here that is being left out for now
-   * 1) set session credentials.  can probably ignore since axtls puts this
-   *    info in the ssl_ctx struct
-   * 2) setting up callbacks.  these seem gnutls specific
-   */
-
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    const uint8_t *ssl_sessionid;
-    size_t ssl_idsize;
-
-    /* In axTLS, handshaking happens inside ssl_client_new. */
-    Curl_ssl_sessionid_lock(conn);
-    if(!Curl_ssl_getsessionid(conn, (void **) &ssl_sessionid, &ssl_idsize,
-                              sockindex)) {
-      /* we got a session id, use it! */
-      infof(data, "SSL re-using session ID\n");
-      ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex],
-                           ssl_sessionid, (uint8_t)ssl_idsize, NULL);
-    }
-    Curl_ssl_sessionid_unlock(conn);
-  }
-
-  if(!ssl)
-    ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex], NULL, 0, NULL);
-
-  BACKEND->ssl = ssl;
-  return CURLE_OK;
-}
-
-static void Curl_axtls_close(struct connectdata *conn, int sockindex)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-
-  infof(conn->data, "  Curl_axtls_close\n");
-
-    /* line from openssl.c: (void)SSL_shutdown(BACKEND->ssl);
-       axTLS compat layer does nothing for SSL_shutdown */
-
-    /* The following line is from openssl.c.  There seems to be no axTLS
-       equivalent.  ssl_free and ssl_ctx_free close things.
-       SSL_set_connect_state(connssl->handle); */
-
-  free_ssl_structs(connssl);
-}
-
-/*
- * For both blocking and non-blocking connects, this function finalizes the
- * SSL connection.
- */
-static CURLcode connect_finish(struct connectdata *conn, int sockindex)
-{
-  struct Curl_easy *data = conn->data;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  SSL *ssl = BACKEND->ssl;
-  const char *peer_CN;
-  uint32_t dns_altname_index;
-  const char *dns_altname;
-  int8_t found_subject_alt_names = 0;
-  int8_t found_subject_alt_name_matching_conn = 0;
-  const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
-    conn->host.name;
-  const char * const dispname = SSL_IS_PROXY() ?
-    conn->http_proxy.host.dispname : conn->host.dispname;
-
-  /* Here, gtls.c gets the peer certificates and fails out depending on
-   * settings in "data."  axTLS api doesn't have get cert chain fcn, so omit?
-   */
-
-  /* Verify server's certificate */
-  if(SSL_CONN_CONFIG(verifypeer)) {
-    if(ssl_verify_cert(ssl) != SSL_OK) {
-      Curl_axtls_close(conn, sockindex);
-      failf(data, "server cert verify failed");
-      return CURLE_PEER_FAILED_VERIFICATION;
-    }
-  }
-  else
-    infof(data, "\t server certificate verification SKIPPED\n");
-
-  /* Here, gtls.c does issuer verification. axTLS has no straightforward
-   * equivalent, so omitting for now.*/
-
-  /* Here, gtls.c does the following
-   * 1) x509 hostname checking per RFC2818.  axTLS doesn't support this, but
-   *    it seems useful. This is now implemented, by Oscar Koeroo
-   * 2) checks cert validity based on time.  axTLS does this in ssl_verify_cert
-   * 3) displays a bunch of cert information.  axTLS doesn't support most of
-   *    this, but a couple fields are available.
-   */
-
-  /* There is no (DNS) Altnames count in the version 1.4.8 API. There is a
-     risk of an inifite loop */
-  for(dns_altname_index = 0; ; dns_altname_index++) {
-    dns_altname = ssl_get_cert_subject_alt_dnsname(ssl, dns_altname_index);
-    if(dns_altname == NULL) {
-      break;
-    }
-    found_subject_alt_names = 1;
-
-    infof(data, "\tComparing subject alt name DNS with hostname: %s <-> %s\n",
-          dns_altname, hostname);
-    if(Curl_cert_hostcheck(dns_altname, hostname)) {
-      found_subject_alt_name_matching_conn = 1;
-      break;
-    }
-  }
-
-  /* RFC2818 checks */
-  if(found_subject_alt_names && !found_subject_alt_name_matching_conn) {
-    if(SSL_CONN_CONFIG(verifyhost)) {
-      /* Break connection ! */
-      Curl_axtls_close(conn, sockindex);
-      failf(data, "\tsubjectAltName(s) do not match %s\n", dispname);
-      return CURLE_PEER_FAILED_VERIFICATION;
-    }
-    else
-      infof(data, "\tsubjectAltName(s) do not match %s\n", dispname);
-  }
-  else if(found_subject_alt_names == 0) {
-    /* Per RFC2818, when no Subject Alt Names were available, examine the peer
-       CN as a legacy fallback */
-    peer_CN = ssl_get_cert_dn(ssl, SSL_X509_CERT_COMMON_NAME);
-    if(peer_CN == NULL) {
-      if(SSL_CONN_CONFIG(verifyhost)) {
-        Curl_axtls_close(conn, sockindex);
-        failf(data, "unable to obtain common name from peer certificate");
-        return CURLE_PEER_FAILED_VERIFICATION;
-      }
-      else
-        infof(data, "unable to obtain common name from peer certificate");
-    }
-    else {
-      if(!Curl_cert_hostcheck((const char *)peer_CN, hostname)) {
-        if(SSL_CONN_CONFIG(verifyhost)) {
-          /* Break connection ! */
-          Curl_axtls_close(conn, sockindex);
-          failf(data, "\tcommon name \"%s\" does not match \"%s\"\n",
-                peer_CN, dispname);
-          return CURLE_PEER_FAILED_VERIFICATION;
-        }
-        else
-          infof(data, "\tcommon name \"%s\" does not match \"%s\"\n",
-                peer_CN, dispname);
-      }
-    }
-  }
-
-  /* General housekeeping */
-  connssl->state = ssl_connection_complete;
-  conn->recv[sockindex] = axtls_recv;
-  conn->send[sockindex] = axtls_send;
-
-  /* Put our freshly minted SSL session in cache */
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    const uint8_t *ssl_sessionid = ssl_get_session_id(ssl);
-    size_t ssl_idsize = ssl_get_session_id_size(ssl);
-    Curl_ssl_sessionid_lock(conn);
-    if(Curl_ssl_addsessionid(conn, (void *) ssl_sessionid, ssl_idsize,
-                             sockindex) != CURLE_OK)
-      infof(data, "failed to add session to cache\n");
-    Curl_ssl_sessionid_unlock(conn);
-  }
-
-  return CURLE_OK;
-}
-
-/*
- * Use axTLS's non-blocking connection feature to open an SSL connection.
- * This is called after a TCP connection is already established.
- */
-static CURLcode Curl_axtls_connect_nonblocking(struct connectdata *conn,
-                                               int sockindex, bool *done)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  CURLcode conn_step;
-  int ssl_fcn_return;
-  int i;
-
- *done = FALSE;
-  /* connectdata is calloc'd and connecting_state is only changed in this
-     function, so this is safe, as the state is effectively initialized. */
-  if(connssl->connecting_state == ssl_connect_1) {
-    conn_step = connect_prep(conn, sockindex);
-    if(conn_step != CURLE_OK) {
-      Curl_axtls_close(conn, sockindex);
-      return conn_step;
-    }
-    connssl->connecting_state = ssl_connect_2;
-  }
-
-  if(connssl->connecting_state == ssl_connect_2) {
-    /* Check to make sure handshake was ok. */
-    if(ssl_handshake_status(BACKEND->ssl) != SSL_OK) {
-      /* Loop to perform more work in between sleeps. This is work around the
-         fact that axtls does not expose any knowledge about when work needs
-         to be performed. This can save ~25% of time on SSL handshakes. */
-      for(i = 0; i<5; i++) {
-        ssl_fcn_return = ssl_read(BACKEND->ssl, NULL);
-        if(ssl_fcn_return < 0) {
-          Curl_axtls_close(conn, sockindex);
-          ssl_display_error(ssl_fcn_return); /* goes to stdout. */
-          return map_error_to_curl(ssl_fcn_return);
-        }
-        return CURLE_OK;
-      }
-    }
-    infof(conn->data, "handshake completed successfully\n");
-    connssl->connecting_state = ssl_connect_3;
-  }
-
-  if(connssl->connecting_state == ssl_connect_3) {
-    conn_step = connect_finish(conn, sockindex);
-    if(conn_step != CURLE_OK) {
-      Curl_axtls_close(conn, sockindex);
-      return conn_step;
-    }
-
-    /* Reset connect state */
-    connssl->connecting_state = ssl_connect_1;
-
-    *done = TRUE;
-    return CURLE_OK;
-  }
-
-  /* Unrecognized state.  Things are very bad. */
-  connssl->state  = ssl_connection_none;
-  connssl->connecting_state = ssl_connect_1;
-  /* Return value perhaps not strictly correct, but distinguishes the issue.*/
-  return CURLE_BAD_FUNCTION_ARGUMENT;
-}
-
-
-/*
- * This function is called after the TCP connect has completed. Setup the TLS
- * layer and do all necessary magic for a blocking connect.
- */
-static CURLcode Curl_axtls_connect(struct connectdata *conn, int sockindex)
-{
-  struct Curl_easy *data = conn->data;
-  CURLcode conn_step = connect_prep(conn, sockindex);
-  int ssl_fcn_return;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  SSL *ssl = BACKEND->ssl;
-  long timeout_ms;
-
-  if(conn_step != CURLE_OK) {
-    Curl_axtls_close(conn, sockindex);
-    return conn_step;
-  }
-
-  /* Check to make sure handshake was ok. */
-  while(ssl_handshake_status(ssl) != SSL_OK) {
-    /* check allowed time left */
-    timeout_ms = Curl_timeleft(data, NULL, TRUE);
-
-    if(timeout_ms < 0) {
-      /* no need to continue if time already is up */
-      failf(data, "SSL connection timeout");
-      return CURLE_OPERATION_TIMEDOUT;
-    }
-
-    ssl_fcn_return = ssl_read(ssl, NULL);
-    if(ssl_fcn_return < 0) {
-      Curl_axtls_close(conn, sockindex);
-      ssl_display_error(ssl_fcn_return); /* goes to stdout. */
-      return map_error_to_curl(ssl_fcn_return);
-    }
-    /* TODO: avoid polling */
-    Curl_wait_ms(10);
-  }
-  infof(conn->data, "handshake completed successfully\n");
-
-  conn_step = connect_finish(conn, sockindex);
-  if(conn_step != CURLE_OK) {
-    Curl_axtls_close(conn, sockindex);
-    return conn_step;
-  }
-
-  return CURLE_OK;
-}
-
-/* return number of sent (non-SSL) bytes */
-static ssize_t axtls_send(struct connectdata *conn,
-                          int sockindex,
-                          const void *mem,
-                          size_t len,
-                          CURLcode *err)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  /* ssl_write() returns 'int' while write() and send() returns 'size_t' */
-  int rc = ssl_write(BACKEND->ssl, mem, (int)len);
-
-  infof(conn->data, "  axtls_send\n");
-
-  if(rc < 0) {
-    *err = map_error_to_curl(rc);
-    rc = -1; /* generic error code for send failure */
-  }
-
-  *err = CURLE_OK;
-  return rc;
-}
-
-/*
- * This function is called to shut down the SSL layer but keep the
- * socket open (CCC - Clear Command Channel)
- */
-static int Curl_axtls_shutdown(struct connectdata *conn, int sockindex)
-{
-  /* Outline taken from openssl.c since functions are in axTLS compat layer.
-     axTLS's error set is much smaller, so a lot of error-handling was removed.
-   */
-  int retval = 0;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct Curl_easy *data = conn->data;
-  uint8_t *buf;
-  ssize_t nread;
-
-  infof(conn->data, "  Curl_axtls_shutdown\n");
-
-  /* This has only been tested on the proftpd server, and the mod_tls code
-     sends a close notify alert without waiting for a close notify alert in
-     response. Thus we wait for a close notify alert from the server, but
-     we do not send one. Let's hope other servers do the same... */
-
-  /* axTLS compat layer does nothing for SSL_shutdown, so we do nothing too
-  if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
-      (void)SSL_shutdown(BACKEND->ssl);
-  */
-
-  if(BACKEND->ssl) {
-    int what = SOCKET_READABLE(conn->sock[sockindex], SSL_SHUTDOWN_TIMEOUT);
-    if(what > 0) {
-      /* Something to read, let's do it and hope that it is the close
-         notify alert from the server.  buf is managed internally by
-         axTLS and will be released upon calling ssl_free via
-         free_ssl_structs. */
-      nread = (ssize_t)ssl_read(BACKEND->ssl, &buf);
-
-      if(nread < SSL_OK) {
-        failf(data, "close notify alert not received during shutdown");
-        retval = -1;
-      }
-    }
-    else if(0 == what) {
-      /* timeout */
-      failf(data, "SSL shutdown timeout");
-    }
-    else {
-      /* anything that gets here is fatally bad */
-      failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
-      retval = -1;
-    }
-
-    free_ssl_structs(connssl);
-  }
-  return retval;
-}
-
-static ssize_t axtls_recv(struct connectdata *conn, /* connection data */
-                          int num,                  /* socketindex */
-                          char *buf,                /* store read data here */
-                          size_t buffersize,        /* max amount to read */
-                          CURLcode *err)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[num];
-  ssize_t ret = 0;
-  uint8_t *read_buf;
-
-  infof(conn->data, "  axtls_recv\n");
-
-  *err = CURLE_OK;
-  if(connssl) {
-    ret = ssl_read(BACKEND->ssl, &read_buf);
-    if(ret > SSL_OK) {
-      /* ssl_read returns SSL_OK if there is more data to read, so if it is
-         larger, then all data has been read already.  */
-      memcpy(buf, read_buf,
-             (size_t)ret > buffersize ? buffersize : (size_t)ret);
-    }
-    else if(ret == SSL_OK) {
-      /* more data to be read, signal caller to call again */
-      *err = CURLE_AGAIN;
-      ret = -1;
-    }
-    else if(ret == -3) {
-      /* With patched axTLS, SSL_CLOSE_NOTIFY=-3.  Hard-coding until axTLS
-         team approves proposed fix. */
-      Curl_axtls_close(conn, num);
-    }
-    else {
-      failf(conn->data, "axTLS recv error (%d)", ret);
-      *err = map_error_to_curl((int) ret);
-      ret = -1;
-    }
-  }
-
-  return ret;
-}
-
-/*
- * Return codes:
- *     1 means the connection is still in place
- *     0 means the connection has been closed
- *    -1 means the connection status is unknown
- */
-static int Curl_axtls_check_cxn(struct connectdata *conn)
-{
-  /* openssl.c line:
-     rc = SSL_peek(conn->ssl[FIRSTSOCKET].backend->ssl, (void*)&buf, 1);
-     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 */
-}
-
-static void Curl_axtls_session_free(void *ptr)
-{
-  (void)ptr;
-  /* free the ID */
-  /* both openssl.c and gtls.c do something here, but axTLS's OpenSSL
-     compatibility layer does nothing, so we do nothing too. */
-}
-
-static size_t Curl_axtls_version(char *buffer, size_t size)
-{
-  return snprintf(buffer, size, "axTLS/%s", ssl_version());
-}
-
-static CURLcode Curl_axtls_random(struct Curl_easy *data,
-                                  unsigned char *entropy, size_t length)
-{
-  static bool ssl_seeded = FALSE;
-  (void)data;
-  if(!ssl_seeded) {
-    ssl_seeded = TRUE;
-    /* Initialize the seed if not already done. This call is not exactly thread
-     * safe (and neither is the ssl_seeded check), but the worst effect of a
-     * race condition is that some global resources will leak. */
-    RNG_initialize();
-  }
-  get_random((int)length, entropy);
-  return CURLE_OK;
-}
-
-static void *Curl_axtls_get_internals(struct ssl_connect_data *connssl,
-                                      CURLINFO info UNUSED_PARAM)
-{
-  (void)info;
-  return BACKEND->ssl;
-}
-
-const struct Curl_ssl Curl_ssl_axtls = {
-  { CURLSSLBACKEND_AXTLS, "axtls" }, /* info */
-  0, /* no fancy stuff */
-  sizeof(struct ssl_backend_data),
-
-  /*
-   * axTLS has no global init.  Everything is done through SSL and SSL_CTX
-   * structs stored in connectdata structure.
-   */
-  Curl_none_init,                 /* init */
-  /* axTLS has no global cleanup. */
-  Curl_none_cleanup,              /* cleanup */
-  Curl_axtls_version,             /* version */
-  Curl_axtls_check_cxn,           /* check_cxn */
-  Curl_axtls_shutdown,            /* shutdown */
-  Curl_none_data_pending,         /* data_pending */
-  Curl_axtls_random,              /* random */
-  Curl_none_cert_status_request,  /* cert_status_request */
-  Curl_axtls_connect,             /* connect */
-  Curl_axtls_connect_nonblocking, /* connect_nonblocking */
-  Curl_axtls_get_internals,       /* get_internals */
-  Curl_axtls_close,               /* close_one */
-  Curl_none_close_all,            /* close_all */
-  Curl_axtls_session_free,        /* session_free */
-  Curl_none_set_engine,           /* set_engine */
-  Curl_none_set_engine_default,   /* set_engine_default */
-  Curl_none_engines_list,         /* engines_list */
-  Curl_none_false_start,          /* false_start */
-  Curl_none_md5sum,               /* md5sum */
-  NULL                            /* sha256sum */
-};
-
-#endif /* USE_AXTLS */
diff --git a/lib/vtls/axtls.h b/lib/vtls/axtls.h
deleted file mode 100644
index cb8187272..000000000
--- a/lib/vtls/axtls.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef HEADER_CURL_AXTLS_H
-#define HEADER_CURL_AXTLS_H
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2010, DirecTV, Contact: Eric Hu <ehu@directv.com>
- * Copyright (C) 2010 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-#ifdef USE_AXTLS
-#include "curl/curl.h"
-#include "urldata.h"
-
-extern const struct Curl_ssl Curl_ssl_axtls;
-
-#endif /* USE_AXTLS */
-#endif /* HEADER_CURL_AXTLS_H */
diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 6af39feab..144768c74 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -1170,8 +1170,6 @@ static const struct Curl_ssl Curl_ssl_multi = {
 const struct Curl_ssl *Curl_ssl =
 #if defined(CURL_WITH_MULTI_SSL)
   &Curl_ssl_multi;
-#elif defined(USE_AXTLS)
-  &Curl_ssl_axtls;
 #elif defined(USE_CYASSL)
   &Curl_ssl_cyassl;
 #elif defined(USE_DARWINSSL)
@@ -1197,9 +1195,6 @@ const struct Curl_ssl *Curl_ssl =
 #endif
 
 static const struct Curl_ssl *available_backends[] = {
-#if defined(USE_AXTLS)
-  &Curl_ssl_axtls,
-#endif
 #if defined(USE_CYASSL)
   &Curl_ssl_cyassl,
 #endif
diff --git a/lib/vtls/vtls.h b/lib/vtls/vtls.h
index 5cd11602e..1f163631f 100644
--- a/lib/vtls/vtls.h
+++ b/lib/vtls/vtls.h
@@ -103,7 +103,6 @@ CURLcode Curl_none_md5sum(unsigned char *input, size_t inputlen,
 #include "nssg.h"           /* NSS versions */
 #include "gskit.h"          /* Global Secure ToolKit versions */
 #include "polarssl.h"       /* PolarSSL versions */
-#include "axtls.h"          /* axTLS versions */
 #include "cyassl.h"         /* CyaSSL versions */
 #include "schannel.h"       /* Schannel SSPI version */
 #include "darwinssl.h"      /* SecureTransport (Darwin) version */