mesalink: remove supportbagder/rm-mesalink

Mesalink has ceased development. We can no longer encourage use of it.
It seems to be continued under the name TabbySSL, but no attempts have
(yet) been to make curl support it.

Fixes #8188
Closes #8191

16 files changed, 13 insertions, 894 deletions

diff --git a/configure.ac b/configure.ac
index 63e320236..7430bd747 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2022, 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
@@ -143,7 +143,7 @@ AC_SUBST(PKGADD_VENDOR)
 
 dnl
 dnl initialize all the info variables
-    curl_ssl_msg="no      (--with-{openssl,gnutls,nss,mbedtls,wolfssl,schannel,secure-transport,mesalink,amissl,bearssl,rustls} )"
+    curl_ssl_msg="no      (--with-{openssl,gnutls,nss,mbedtls,wolfssl,schannel,secure-transport,amissl,bearssl,rustls} )"
     curl_ssh_msg="no      (--with-{libssh,libssh2})"
    curl_zlib_msg="no      (--with-zlib)"
  curl_brotli_msg="no      (--with-brotli)"
@@ -246,14 +246,6 @@ AS_HELP_STRING([--with-wolfssl=PATH],[where to look for WolfSSL, PATH points to
     test -z "TLSCHOICE" || TLSCHOICE="${TLSCHOICE:+$TLSCHOICE, }wolfSSL")
   fi
 
-OPT_MESALINK=no
-AC_ARG_WITH(mesalink,dnl
-AS_HELP_STRING([--with-mesalink=PATH],[where to look for MesaLink, PATH points to the installation root]),
-  OPT_MESALINK=$withval
-  if test X"$withval" != Xno; then
-    test -z "TLSCHOICE" || TLSCHOICE="${TLSCHOICE:+$TLSCHOICE, }MesaLink")
-  fi
-
 OPT_BEARSSL=no
 AC_ARG_WITH(bearssl,dnl
 AS_HELP_STRING([--with-bearssl=PATH],[where to look for BearSSL, PATH points to the installation root]),
@@ -290,7 +282,6 @@ Select from these:
   --with-bearssl
   --with-gnutls
   --with-mbedtls
-  --with-mesalink
   --with-nss
   --with-openssl (also works for BoringSSL and libressl)
   --with-rustls
@@ -1879,7 +1870,6 @@ CURL_WITH_OPENSSL
 CURL_WITH_GNUTLS
 CURL_WITH_MBEDTLS
 CURL_WITH_WOLFSSL
-CURL_WITH_MESALINK
 CURL_WITH_BEARSSL
 CURL_WITH_RUSTLS
 CURL_WITH_NSS
@@ -1889,11 +1879,11 @@ if test "x$USE_WIN32_CRYPTO" = "x1" -o "x$USE_SCHANNEL" = "x1"; then
   LIBS="-ladvapi32 -lcrypt32 $LIBS"
 fi
 
-case "x$OPENSSL_ENABLED$GNUTLS_ENABLED$NSS_ENABLED$MBEDTLS_ENABLED$WOLFSSL_ENABLED$SCHANNEL_ENABLED$SECURETRANSPORT_ENABLED$MESALINK_ENABLED$BEARSSL_ENABLED$AMISSL_ENABLED$RUSTLS_ENABLED"
+case "x$OPENSSL_ENABLED$GNUTLS_ENABLED$NSS_ENABLED$MBEDTLS_ENABLED$WOLFSSL_ENABLED$SCHANNEL_ENABLED$SECURETRANSPORT_ENABLED$BEARSSL_ENABLED$AMISSL_ENABLED$RUSTLS_ENABLED"
 in
 x)
   AC_MSG_WARN([SSL disabled, you will not be able to use HTTPS, FTPS, NTLM and more.])
-  AC_MSG_WARN([Use --with-openssl, --with-gnutls, --with-wolfssl, --with-mbedtls, --with-nss, --with-schannel, --with-secure-transport, --with-mesalink, --with-amissl, --with-bearssl or --with-rustls to address this.])
+  AC_MSG_WARN([Use --with-openssl, --with-gnutls, --with-wolfssl, --with-mbedtls, --with-nss, --with-schannel, --with-secure-transport, --with-amissl, --with-bearssl or --with-rustls to address this.])
   ;;
 x1)
   # one SSL backend is enabled
diff --git a/docs/FAQ b/docs/FAQ
index 30c889e4e..71b2ff801 100644
--- a/docs/FAQ
+++ b/docs/FAQ
@@ -421,7 +421,7 @@ FAQ
   backends.
 
   curl can be built to use one of the following SSL alternatives: OpenSSL,
-  libressl, BoringSSL, GnuTLS, wolfSSL, NSS, mbedTLS, MesaLink, Secure
+  libressl, BoringSSL, GnuTLS, wolfSSL, NSS, mbedTLS, Secure
   Transport (native iOS/OS X), Schannel (native Windows), GSKit (native IBM
   i), BearSSL, or Rustls. They all have their pros and cons, and we try to
   maintain a comparison of them here: https://curl.se/docs/ssl-compared.html
diff --git a/docs/INSTALL.md b/docs/INSTALL.md
index 6079123ba..fc15bb51e 100644
--- a/docs/INSTALL.md
+++ b/docs/INSTALL.md
@@ -117,7 +117,6 @@ These options are provided to select TLS backend to use.
  - BearSSL: `--with-bearssl`
  - GnuTLS: `--with-gnutls`.
  - mbedTLS: `--with-mbedtls`
- - MesaLink: `--with-mesalink`
  - NSS: `--with-nss`
  - OpenSSL: `--with-openssl` (also for BoringSSL and libressl)
  - rustls: `--with-rustls`
diff --git a/docs/cmdline-opts/page-footer b/docs/cmdline-opts/page-footer
index edd756f0f..320fccaab 100644
--- a/docs/cmdline-opts/page-footer
+++ b/docs/cmdline-opts/page-footer
@@ -60,7 +60,7 @@ invoked. Setting a name that is not a built-in alternative will make curl
 stay with the default.
 
 SSL backend names (case-insensitive): bearssl, gnutls, gskit, mbedtls,
-mesalink, nss, openssl, rustls, schannel, secure-transport, wolfssl
+nss, openssl, rustls, schannel, secure-transport, wolfssl
 .IP "HOME <dir>"
 If set, this is used to find the home directory when that is needed. Like when
 looking for the default .curlrc. \fBCURL_HOME\fP and \fBXDG_CONFIG_HOME\fP
diff --git a/docs/libcurl/libcurl-env.3 b/docs/libcurl/libcurl-env.3
index 15aa633ac..a33faada9 100644
--- a/docs/libcurl/libcurl-env.3
+++ b/docs/libcurl/libcurl-env.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 2018 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 2018 - 2022, 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
@@ -49,7 +49,7 @@ libcurl, this variable's selection will be used. Setting a name that is not a
 built-in alternative will make libcurl stay with the default.
 
 SSL backend names (case-insensitive): bearssl, gnutls, gskit, mbedtls,
-mesalink, nss, openssl, rustls, schannel, secure-transport, wolfssl
+nss, openssl, rustls, schannel, secure-transport, wolfssl
 .IP HOME
 When the netrc feature is used (\fICURLOPT_NETRC(3)\fP), this variable is
 checked as the primary way to find the "current" home directory in which
diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index 3e9ddec12..fedd70a16 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2022, 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
@@ -47,7 +47,6 @@ LIB_VTLS_CFILES =           \
   vtls/keylog.c             \
   vtls/mbedtls.c            \
   vtls/mbedtls_threadlock.c \
-  vtls/mesalink.c           \
   vtls/nss.c                \
   vtls/openssl.c            \
   vtls/rustls.c             \
@@ -64,7 +63,6 @@ LIB_VTLS_HFILES =           \
   vtls/keylog.h             \
   vtls/mbedtls.h            \
   vtls/mbedtls_threadlock.h \
-  vtls/mesalink.h           \
   vtls/nssg.h               \
   vtls/openssl.h            \
   vtls/rustls.h             \
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 61384cdff..9d4db00bd 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, 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
@@ -641,7 +641,7 @@ int netware_init(void);
 #if defined(USE_GNUTLS) || defined(USE_OPENSSL) || defined(USE_NSS) || \
     defined(USE_MBEDTLS) || \
     defined(USE_WOLFSSL) || defined(USE_SCHANNEL) || \
-    defined(USE_SECTRANSP) || defined(USE_GSKIT) || defined(USE_MESALINK) || \
+    defined(USE_SECTRANSP) || defined(USE_GSKIT) || \
     defined(USE_BEARSSL) || defined(USE_RUSTLS)
 #define USE_SSL    /* SSL support has been enabled */
 #endif
diff --git a/lib/vtls/mesalink.c b/lib/vtls/mesalink.c
deleted file mode 100644
index 35a916586..000000000
--- a/lib/vtls/mesalink.c
+++ /dev/null
@@ -1,679 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2017 - 2018, Yiming Jing, <jingyiming@baidu.com>
- * Copyright (C) 1998 - 2021, 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.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 MesaLink-specific code for the TLS/SSL layer. No code
- * but vtls.c should ever call or use these functions.
- *
- */
-
-/*
- * Based upon the CyaSSL implementation in cyassl.c and cyassl.h:
- *   Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * Thanks for code and inspiration!
- */
-
-#include "curl_setup.h"
-
-#ifdef USE_MESALINK
-
-#include <mesalink/options.h>
-#include <mesalink/version.h>
-
-#include "urldata.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 "strcase.h"
-#include "x509asn1.h"
-#include "curl_printf.h"
-
-#include "mesalink.h"
-#include <mesalink/openssl/ssl.h>
-#include <mesalink/openssl/err.h>
-
-/* The last #include files should be: */
-#include "curl_memory.h"
-#include "memdebug.h"
-
-#define MESALINK_MAX_ERROR_SZ 80
-
-struct ssl_backend_data
-{
-  SSL_CTX *ctx;
-  SSL *handle;
-};
-
-static Curl_recv mesalink_recv;
-static Curl_send mesalink_send;
-
-static int do_file_type(const char *type)
-{
-  if(!type || !type[0])
-    return SSL_FILETYPE_PEM;
-  if(strcasecompare(type, "PEM"))
-    return SSL_FILETYPE_PEM;
-  if(strcasecompare(type, "DER"))
-    return SSL_FILETYPE_ASN1;
-  return -1;
-}
-
-/*
- * This function loads all the client/CA certificates and CRLs. Setup the TLS
- * layer and do all necessary magic.
- */
-static CURLcode
-mesalink_connect_step1(struct Curl_easy *data,
-                       struct connectdata *conn, int sockindex)
-{
-  char *ciphers;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct in_addr addr4;
-#ifdef ENABLE_IPV6
-  struct in6_addr addr6;
-#endif
-  const char * const hostname = SSL_HOST_NAME();
-  size_t hostname_len = strlen(hostname);
-  SSL_METHOD *req_method = NULL;
-  curl_socket_t sockfd = conn->sock[sockindex];
-  struct ssl_backend_data *backend = connssl->backend;
-
-  if(connssl->state == ssl_connection_complete)
-    return CURLE_OK;
-
-  if(SSL_CONN_CONFIG(version_max) != CURL_SSLVERSION_MAX_NONE) {
-    failf(data, "MesaLink does not support to set maximum SSL/TLS version");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  switch(SSL_CONN_CONFIG(version)) {
-  case CURL_SSLVERSION_SSLv3:
-  case CURL_SSLVERSION_TLSv1:
-  case CURL_SSLVERSION_TLSv1_0:
-  case CURL_SSLVERSION_TLSv1_1:
-    failf(data, "MesaLink does not support SSL 3.0, TLS 1.0, or TLS 1.1");
-    return CURLE_NOT_BUILT_IN;
-  case CURL_SSLVERSION_DEFAULT:
-  case CURL_SSLVERSION_TLSv1_2:
-    req_method = TLSv1_2_client_method();
-    break;
-  case CURL_SSLVERSION_TLSv1_3:
-    req_method = TLSv1_3_client_method();
-    break;
-  case CURL_SSLVERSION_SSLv2:
-    failf(data, "MesaLink does not support SSLv2");
-    return CURLE_SSL_CONNECT_ERROR;
-  default:
-    failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  if(!req_method) {
-    failf(data, "SSL: couldn't create a method!");
-    return CURLE_OUT_OF_MEMORY;
-  }
-
-  if(backend->ctx)
-    SSL_CTX_free(backend->ctx);
-  backend->ctx = SSL_CTX_new(req_method);
-
-  if(!backend->ctx) {
-    failf(data, "SSL: couldn't create a context!");
-    return CURLE_OUT_OF_MEMORY;
-  }
-
-  SSL_CTX_set_verify(
-    backend->ctx, SSL_CONN_CONFIG(verifypeer) ?
-      SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL);
-
-  if(SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(CApath)) {
-    if(!SSL_CTX_load_verify_locations(backend->ctx, SSL_CONN_CONFIG(CAfile),
-                                      SSL_CONN_CONFIG(CApath))) {
-      if(SSL_CONN_CONFIG(verifypeer)) {
-        failf(data,
-              "error setting certificate verify locations: "
-              " CAfile: %s CApath: %s",
-              SSL_CONN_CONFIG(CAfile) ?
-              SSL_CONN_CONFIG(CAfile) : "none",
-              SSL_CONN_CONFIG(CApath) ?
-              SSL_CONN_CONFIG(CApath) : "none");
-        return CURLE_SSL_CACERT_BADFILE;
-      }
-      infof(data,
-          "error setting certificate verify locations,"
-          " continuing anyway:");
-    }
-    else {
-      infof(data, "successfully set certificate verify locations:");
-    }
-    infof(data, " CAfile: %s",
-          SSL_CONN_CONFIG(CAfile) ? SSL_CONN_CONFIG(CAfile): "none");
-    infof(data, " CApath: %s",
-          SSL_CONN_CONFIG(CApath) ? SSL_CONN_CONFIG(CApath): "none");
-  }
-
-  if(SSL_SET_OPTION(primary.clientcert) && SSL_SET_OPTION(key)) {
-    int file_type = do_file_type(SSL_SET_OPTION(cert_type));
-
-    if(SSL_CTX_use_certificate_chain_file(backend->ctx,
-                                          SSL_SET_OPTION(primary.clientcert),
-                                          file_type) != 1) {
-      failf(data, "unable to use client certificate (no key or wrong pass"
-            " phrase?)");
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-
-    file_type = do_file_type(SSL_SET_OPTION(key_type));
-    if(SSL_CTX_use_PrivateKey_file(backend->ctx, SSL_SET_OPTION(key),
-                                   file_type) != 1) {
-      failf(data, "unable to set private key");
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-    infof(data,
-          "client cert: %s",
-          SSL_CONN_CONFIG(clientcert)?
-          SSL_CONN_CONFIG(clientcert): "none");
-  }
-
-  ciphers = SSL_CONN_CONFIG(cipher_list);
-  if(ciphers) {
-#ifdef MESALINK_HAVE_CIPHER
-    if(!SSL_CTX_set_cipher_list(backend->ctx, ciphers)) {
-      failf(data, "failed setting cipher list: %s", ciphers);
-      return CURLE_SSL_CIPHER;
-    }
-#endif
-    infof(data, "Cipher selection: %s", ciphers);
-  }
-
-  if(backend->handle)
-    SSL_free(backend->handle);
-  backend->handle = SSL_new(backend->ctx);
-  if(!backend->handle) {
-    failf(data, "SSL: couldn't create a context (handle)!");
-    return CURLE_OUT_OF_MEMORY;
-  }
-
-  if((hostname_len < USHRT_MAX) &&
-     (0 == Curl_inet_pton(AF_INET, hostname, &addr4))
-#ifdef ENABLE_IPV6
-     && (0 == Curl_inet_pton(AF_INET6, hostname, &addr6))
-#endif
-  ) {
-    /* hostname is not a valid IP address */
-    if(SSL_set_tlsext_host_name(backend->handle, hostname) != SSL_SUCCESS) {
-      failf(data,
-            "WARNING: failed to configure server name indication (SNI) "
-            "TLS extension\n");
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-  }
-  else {
-#ifdef CURLDEBUG
-    /* Check if the hostname is 127.0.0.1 or [::1];
-     * otherwise reject because MesaLink always wants a valid DNS Name
-     * specified in RFC 5280 Section 7.2 */
-    if(strncmp(hostname, "127.0.0.1", 9) == 0
-#ifdef ENABLE_IPV6
-       || strncmp(hostname, "[::1]", 5) == 0
-#endif
-    ) {
-      SSL_set_tlsext_host_name(backend->handle, "localhost");
-    }
-    else
-#endif
-    {
-      failf(data,
-            "ERROR: MesaLink does not accept an IP address as a hostname\n");
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-  }
-
-#ifdef MESALINK_HAVE_SESSION
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    void *ssl_sessionid = NULL;
-
-    Curl_ssl_sessionid_lock(data);
-    if(!Curl_ssl_getsessionid(data, conn,
-                              SSL_IS_PROXY() ? TRUE : FALSE,
-                              &ssl_sessionid, NULL, sockindex)) {
-      /* we got a session id, use it! */
-      if(!SSL_set_session(backend->handle, ssl_sessionid)) {
-        Curl_ssl_sessionid_unlock(data);
-        failf(
-          data,
-          "SSL: SSL_set_session failed: %s",
-          ERR_error_string(SSL_get_error(backend->handle, 0), error_buffer));
-        return CURLE_SSL_CONNECT_ERROR;
-      }
-      /* Informational message */
-      infof(data, "SSL re-using session ID");
-    }
-    Curl_ssl_sessionid_unlock(data);
-  }
-#endif /* MESALINK_HAVE_SESSION */
-
-  if(SSL_set_fd(backend->handle, (int)sockfd) != SSL_SUCCESS) {
-    failf(data, "SSL: SSL_set_fd failed");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  connssl->connecting_state = ssl_connect_2;
-  return CURLE_OK;
-}
-
-static CURLcode
-mesalink_connect_step2(struct Curl_easy *data,
-                       struct connectdata *conn, int sockindex)
-{
-  int ret = -1;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct ssl_backend_data *backend = connssl->backend;
-
-  conn->recv[sockindex] = mesalink_recv;
-  conn->send[sockindex] = mesalink_send;
-
-  ret = SSL_connect(backend->handle);
-  if(ret != SSL_SUCCESS) {
-    int detail = SSL_get_error(backend->handle, ret);
-
-    if(SSL_ERROR_WANT_CONNECT == detail || SSL_ERROR_WANT_READ == detail) {
-      connssl->connecting_state = ssl_connect_2_reading;
-      return CURLE_OK;
-    }
-    else {
-      char error_buffer[MESALINK_MAX_ERROR_SZ];
-      failf(data,
-            "SSL_connect failed with error %d: %s",
-            detail,
-            ERR_error_string_n(detail, error_buffer, sizeof(error_buffer)));
-      ERR_print_errors_fp(stderr);
-      if(detail && SSL_CONN_CONFIG(verifypeer)) {
-        detail &= ~0xFF;
-        if(detail == TLS_ERROR_WEBPKI_ERRORS) {
-          failf(data, "Cert verify failed");
-          return CURLE_PEER_FAILED_VERIFICATION;
-        }
-      }
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-  }
-
-  connssl->connecting_state = ssl_connect_3;
-  infof(data,
-        "SSL connection using %s / %s",
-        SSL_get_version(backend->handle),
-        SSL_get_cipher_name(backend->handle));
-
-  return CURLE_OK;
-}
-
-static CURLcode
-mesalink_connect_step3(struct connectdata *conn, int sockindex)
-{
-  CURLcode result = CURLE_OK;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-
-  DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
-
-#ifdef MESALINK_HAVE_SESSION
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    bool incache;
-    SSL_SESSION *our_ssl_sessionid;
-    void *old_ssl_sessionid = NULL;
-    bool isproxy = SSL_IS_PROXY() ? TRUE : FALSE;
-    struct ssl_backend_data *backend = connssl->backend;
-
-    our_ssl_sessionid = SSL_get_session(backend->handle);
-
-    Curl_ssl_sessionid_lock(data);
-    incache =
-      !(Curl_ssl_getsessionid(data, conn, isproxy, &old_ssl_sessionid, NULL,
-                              sockindex));
-    if(incache) {
-      if(old_ssl_sessionid != our_ssl_sessionid) {
-        infof(data, "old SSL session ID is stale, removing");
-        Curl_ssl_delsessionid(data, old_ssl_sessionid);
-        incache = FALSE;
-      }
-    }
-
-    if(!incache) {
-      result =
-        Curl_ssl_addsessionid(data, conn, isproxy, our_ssl_sessionid, 0,
-                              sockindex, NULL);
-      if(result) {
-        Curl_ssl_sessionid_unlock(data);
-        failf(data, "failed to store ssl session");
-        return result;
-      }
-    }
-    Curl_ssl_sessionid_unlock(data);
-  }
-#endif /* MESALINK_HAVE_SESSION */
-
-  connssl->connecting_state = ssl_connect_done;
-
-  return result;
-}
-
-static ssize_t
-mesalink_send(struct Curl_easy *data, int sockindex, const void *mem,
-              size_t len, CURLcode *curlcode)
-{
-  struct connectdata *conn = data->conn;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct ssl_backend_data *backend = connssl->backend;
-  char error_buffer[MESALINK_MAX_ERROR_SZ];
-  int memlen = (len > (size_t)INT_MAX) ? INT_MAX : (int)len;
-  int rc = SSL_write(backend->handle, mem, memlen);
-
-  if(rc < 0) {
-    int err = SSL_get_error(backend->handle, rc);
-    switch(err) {
-    case SSL_ERROR_WANT_READ:
-    case SSL_ERROR_WANT_WRITE:
-      /* there's data pending, re-invoke SSL_write() */
-      *curlcode = CURLE_AGAIN;
-      return -1;
-    default:
-      failf(data,
-            "SSL write: %s, errno %d",
-            ERR_error_string_n(err, error_buffer, sizeof(error_buffer)),
-            SOCKERRNO);
-      *curlcode = CURLE_SEND_ERROR;
-      return -1;
-    }
-  }
-  return rc;
-}
-
-static void
-mesalink_close(struct Curl_easy *data, struct connectdata *conn, int sockindex)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct ssl_backend_data *backend = connssl->backend;
-
-  (void) data;
-
-  if(backend->handle) {
-    (void)SSL_shutdown(backend->handle);
-    SSL_free(backend->handle);
-    backend->handle = NULL;
-  }
-  if(backend->ctx) {
-    SSL_CTX_free(backend->ctx);
-    backend->ctx = NULL;
-  }
-}
-
-static ssize_t
-mesalink_recv(struct Curl_easy *data, int num, char *buf, size_t buffersize,
-              CURLcode *curlcode)
-{
-  struct connectdata *conn = data->conn;
-  struct ssl_connect_data *connssl = &conn->ssl[num];
-  struct ssl_backend_data *backend = connssl->backend;
-  char error_buffer[MESALINK_MAX_ERROR_SZ];
-  int buffsize = (buffersize > (size_t)INT_MAX) ? INT_MAX : (int)buffersize;
-  int nread = SSL_read(backend->handle, buf, buffsize);
-
-  if(nread <= 0) {
-    int err = SSL_get_error(backend->handle, nread);
-
-    switch(err) {
-    case SSL_ERROR_ZERO_RETURN: /* no more data */
-    case IO_ERROR_CONNECTION_ABORTED:
-      break;
-    case SSL_ERROR_WANT_READ:
-    case SSL_ERROR_WANT_WRITE:
-      /* there's data pending, re-invoke SSL_read() */
-      *curlcode = CURLE_AGAIN;
-      return -1;
-    default:
-      failf(data,
-            "SSL read: %s, errno %d",
-            ERR_error_string_n(err, error_buffer, sizeof(error_buffer)),
-            SOCKERRNO);
-      *curlcode = CURLE_RECV_ERROR;
-      return -1;
-    }
-  }
-  return nread;
-}
-
-static size_t
-mesalink_version(char *buffer, size_t size)
-{
-  return msnprintf(buffer, size, "MesaLink/%s", MESALINK_VERSION_STRING);
-}
-
-static int
-mesalink_init(void)
-{
-  return (SSL_library_init() == SSL_SUCCESS);
-}
-
-/*
- * This function is called to shut down the SSL layer but keep the
- * socket open (CCC - Clear Command Channel)
- */
-static int
-mesalink_shutdown(struct Curl_easy *data,
-                  struct connectdata *conn, int sockindex)
-{
-  int retval = 0;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct ssl_backend_data *backend = connssl->backend;
-
-  (void) data;
-
-  if(backend->handle) {
-    SSL_free(backend->handle);
-    backend->handle = NULL;
-  }
-  return retval;
-}
-
-static CURLcode
-mesalink_connect_common(struct Curl_easy *data, struct connectdata *conn,
-                        int sockindex, bool nonblocking, bool *done)
-{
-  CURLcode result;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  curl_socket_t sockfd = conn->sock[sockindex];
-  timediff_t timeout_ms;
-  int what;
-
-  /* check if the connection has already been established */
-  if(ssl_connection_complete == connssl->state) {
-    *done = TRUE;
-    return CURLE_OK;
-  }
-
-  if(ssl_connect_1 == connssl->connecting_state) {
-    /* Find out how much more time we're allowed */
-    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;
-    }
-
-    result = mesalink_connect_step1(data, conn, sockindex);
-    if(result)
-      return result;
-  }
-
-  while(ssl_connect_2 == connssl->connecting_state ||
-        ssl_connect_2_reading == connssl->connecting_state ||
-        ssl_connect_2_writing == connssl->connecting_state) {
-
-    /* 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;
-    }
-
-    /* if ssl is expecting something, check if it's available. */
-    if(connssl->connecting_state == ssl_connect_2_reading ||
-       connssl->connecting_state == ssl_connect_2_writing) {
-
-      curl_socket_t writefd =
-        ssl_connect_2_writing == connssl->connecting_state ? sockfd
-                                                           : CURL_SOCKET_BAD;
-      curl_socket_t readfd = ssl_connect_2_reading == connssl->connecting_state
-                               ? sockfd
-                               : CURL_SOCKET_BAD;
-
-      what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
-                               nonblocking ? 0 : timeout_ms);
-      if(what < 0) {
-        /* fatal error */
-        failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
-        return CURLE_SSL_CONNECT_ERROR;
-      }
-      else if(0 == what) {
-        if(nonblocking) {
-          *done = FALSE;
-          return CURLE_OK;
-        }
-        else {
-          /* timeout */
-          failf(data, "SSL connection timeout");
-          return CURLE_OPERATION_TIMEDOUT;
-        }
-      }
-      /* socket is readable or writable */
-    }
-
-    /* Run transaction, and return to the caller if it failed or if
-     * this connection is part of a multi handle and this loop would
-     * execute again. This permits the owner of a multi handle to
-     * abort a connection attempt before step2 has completed while
-     * ensuring that a client using select() or epoll() will always
-     * have a valid fdset to wait on.
-     */
-    result = mesalink_connect_step2(data, conn, sockindex);
-
-    if(result ||
-       (nonblocking && (ssl_connect_2 == connssl->connecting_state ||
-                        ssl_connect_2_reading == connssl->connecting_state ||
-                        ssl_connect_2_writing == connssl->connecting_state))) {
-      return result;
-    }
-  } /* repeat step2 until all transactions are done. */
-
-  if(ssl_connect_3 == connssl->connecting_state) {
-    result = mesalink_connect_step3(conn, sockindex);
-    if(result)
-      return result;
-  }
-
-  if(ssl_connect_done == connssl->connecting_state) {
-    connssl->state = ssl_connection_complete;
-    conn->recv[sockindex] = mesalink_recv;
-    conn->send[sockindex] = mesalink_send;
-    *done = TRUE;
-  }
-  else
-    *done = FALSE;
-
-  /* Reset our connect state machine */
-  connssl->connecting_state = ssl_connect_1;
-
-  return CURLE_OK;
-}
-
-static CURLcode
-mesalink_connect_nonblocking(struct Curl_easy *data, struct connectdata *conn,
-                             int sockindex, bool *done)
-{
-  return mesalink_connect_common(data, conn, sockindex, TRUE, done);
-}
-
-static CURLcode
-mesalink_connect(struct Curl_easy *data, struct connectdata *conn,
-                 int sockindex)
-{
-  CURLcode result;
-  bool done = FALSE;
-
-  result = mesalink_connect_common(data, conn, sockindex, FALSE, &done);
-  if(result)
-    return result;
-
-  DEBUGASSERT(done);
-
-  return CURLE_OK;
-}
-
-static void *
-mesalink_get_internals(struct ssl_connect_data *connssl,
-                       CURLINFO info UNUSED_PARAM)
-{
-  struct ssl_backend_data *backend = connssl->backend;
-  (void)info;
-  return backend->handle;
-}
-
-const struct Curl_ssl Curl_ssl_mesalink = {
-  { CURLSSLBACKEND_MESALINK, "MesaLink" }, /* info */
-
-  SSLSUPP_SSL_CTX,
-
-  sizeof(struct ssl_backend_data),
-
-  mesalink_init,                 /* init */
-  Curl_none_cleanup,             /* cleanup */
-  mesalink_version,              /* version */
-  Curl_none_check_cxn,           /* check_cxn */
-  mesalink_shutdown,             /* shutdown */
-  Curl_none_data_pending,        /* data_pending */
-  Curl_none_random,              /* random */
-  Curl_none_cert_status_request, /* cert_status_request */
-  mesalink_connect,              /* connect */
-  mesalink_connect_nonblocking,  /* connect_nonblocking */
-  Curl_ssl_getsock,              /* getsock */
-  mesalink_get_internals,        /* get_internals */
-  mesalink_close,                /* close_one */
-  Curl_none_close_all,           /* close_all */
-  Curl_none_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 */
-  NULL,                          /* sha256sum */
-  NULL,                          /* associate_connection */
-  NULL                           /* disassociate_connection */
-};
-
-#endif
diff --git a/lib/vtls/mesalink.h b/lib/vtls/mesalink.h
deleted file mode 100644
index 03f520c1d..000000000
--- a/lib/vtls/mesalink.h
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifndef HEADER_CURL_MESALINK_H
-#define HEADER_CURL_MESALINK_H
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2017 - 2018, Yiming Jing, <jingyiming@baidu.com>
- * Copyright (C) 1998 - 2020, 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.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.
- *
- ***************************************************************************/
-#include "curl_setup.h"
-
-#ifdef USE_MESALINK
-
-extern const struct Curl_ssl Curl_ssl_mesalink;
-
-#endif /* USE_MESALINK */
-#endif /* HEADER_CURL_MESALINK_H */
diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 6007bbba0..b606c622b 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, 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
@@ -1296,8 +1296,6 @@ const struct Curl_ssl *Curl_ssl =
   &Curl_ssl_openssl;
 #elif defined(USE_SCHANNEL)
   &Curl_ssl_schannel;
-#elif defined(USE_MESALINK)
-  &Curl_ssl_mesalink;
 #elif defined(USE_BEARSSL)
   &Curl_ssl_bearssl;
 #else
@@ -1329,9 +1327,6 @@ static const struct Curl_ssl *available_backends[] = {
 #if defined(USE_SCHANNEL)
   &Curl_ssl_schannel,
 #endif
-#if defined(USE_MESALINK)
-  &Curl_ssl_mesalink,
-#endif
 #if defined(USE_BEARSSL)
   &Curl_ssl_bearssl,
 #endif
diff --git a/lib/vtls/vtls.h b/lib/vtls/vtls.h
index c7bbba082..32cb811ae 100644
--- a/lib/vtls/vtls.h
+++ b/lib/vtls/vtls.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, 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
@@ -120,7 +120,6 @@ bool Curl_ssl_tls13_ciphersuites(void);
 #include "schannel.h"       /* Schannel SSPI version */
 #include "sectransp.h"      /* SecureTransport (Darwin) version */
 #include "mbedtls.h"        /* mbedTLS versions */
-#include "mesalink.h"       /* MesaLink versions */
 #include "bearssl.h"        /* BearSSL versions */
 #include "rustls.h"         /* rustls versions */
 
diff --git a/m4/curl-mesalink.m4 b/m4/curl-mesalink.m4
deleted file mode 100644
index 0f588a985..000000000
--- a/m4/curl-mesalink.m4
+++ /dev/null
@@ -1,107 +0,0 @@
-#***************************************************************************
-#                                  _   _ ____  _
-#  Project                     ___| | | |  _ \| |
-#                             / __| | | | |_) | |
-#                            | (__| |_| |  _ <| |___
-#                             \___|\___/|_| \_\_____|
-#
-# Copyright (C) 1998 - 2021, 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.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.
-#
-#***************************************************************************
-
-AC_DEFUN([CURL_WITH_MESALINK], [
-dnl ----------------------------------------------------
-dnl check for MesaLink
-dnl ----------------------------------------------------
-
-if test "x$OPT_MESALINK" != xno; then
-  _cppflags=$CPPFLAGS
-  _ldflags=$LDFLAGS
-  ssl_msg=
-
-  if test X"$OPT_MESALINK" != Xno; then
-
-    if test "$OPT_MESALINK" = "yes"; then
-      OPT_MESALINK=""
-    fi
-
-    if test -z "$OPT_MESALINK" ; then
-      dnl check for lib first without setting any new path
-
-      AC_CHECK_LIB(mesalink, mesalink_library_init,
-      dnl libmesalink found, set the variable
-       [
-         AC_DEFINE(USE_MESALINK, 1, [if MesaLink is enabled])
-         AC_SUBST(USE_MESALINK, [1])
-         MESALINK_ENABLED=1
-         USE_MESALINK="yes"
-         ssl_msg="MesaLink"
-	 test mesalink != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
-        ])
-    fi
-
-    addld=""
-    addlib=""
-    addcflags=""
-    mesalinklib=""
-
-    if test "x$USE_MESALINK" != "xyes"; then
-      dnl add the path and test again
-      addld=-L$OPT_MESALINK/lib$libsuff
-      addcflags=-I$OPT_MESALINK/include
-      mesalinklib=$OPT_MESALINK/lib$libsuff
-
-      LDFLAGS="$LDFLAGS $addld"
-      if test "$addcflags" != "-I/usr/include"; then
-         CPPFLAGS="$CPPFLAGS $addcflags"
-      fi
-
-      AC_CHECK_LIB(mesalink, mesalink_library_init,
-       [
-       AC_DEFINE(USE_MESALINK, 1, [if MesaLink is enabled])
-       AC_SUBST(USE_MESALINK, [1])
-       MESALINK_ENABLED=1
-       USE_MESALINK="yes"
-       ssl_msg="MesaLink"
-       test mesalink != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
-       ],
-       [
-         CPPFLAGS=$_cppflags
-         LDFLAGS=$_ldflags
-       ])
-    fi
-
-    if test "x$USE_MESALINK" = "xyes"; then
-      AC_MSG_NOTICE([detected MesaLink])
-
-      LIBS="-lmesalink $LIBS"
-
-      if test -n "$mesalinklib"; then
-        dnl when shared libs were found in a path that the run-time
-        dnl linker doesn't search through, we need to add it to
-        dnl LD_LIBRARY_PATH to prevent further configure tests to fail
-        dnl due to this
-        if test "x$cross_compiling" != "xyes"; then
-          LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$mesalinklib"
-          export LD_LIBRARY_PATH
-          AC_MSG_NOTICE([Added $mesalinklib to LD_LIBRARY_PATH])
-        fi
-      fi
-    fi
-
-  fi dnl MesaLink not disabled
-
-  test -z "$ssl_msg" || ssl_backends="${ssl_backends:+$ssl_backends, }$ssl_msg"
-fi
-])
diff --git a/scripts/zuul/before_script.sh b/scripts/zuul/before_script.sh
index a4179740c..10f79f13d 100755
--- a/scripts/zuul/before_script.sh
+++ b/scripts/zuul/before_script.sh
@@ -125,23 +125,6 @@ fi
 # Install common libraries.
 if [ $TRAVIS_OS_NAME = linux ]; then
 
-  if [ "$MESALINK" = "yes" ]; then
-    if [ ! -e $HOME/mesalink-1.0.0/Makefile ]; then
-      cd $HOME
-      curl https://sh.rustup.rs -sSf | sh -s -- -y
-      source $HOME/.cargo/env
-      curl -LO https://github.com/mesalock-linux/mesalink/archive/v1.0.0.tar.gz
-      tar -xzf v1.0.0.tar.gz
-      cd mesalink-1.0.0
-      ./autogen.sh
-      ./configure --enable-tls13
-      make
-    fi
-    cd $HOME/mesalink-1.0.0
-    sudo make install
-
-  fi
-
   if [ "$BEARSSL" = "yes" ]; then
     if [ ! -e $HOME/bearssl-0.6/Makefile ]; then
       cd $HOME
diff --git a/scripts/zuul/script.sh b/scripts/zuul/script.sh
index 7075e1aa7..121dea74b 100755
--- a/scripts/zuul/script.sh
+++ b/scripts/zuul/script.sh
@@ -58,12 +58,6 @@ if [ "$T" = "debug" ]; then
   fi
 fi
 
-if [ "$T" = "debug-mesalink" ]; then
-  ./configure --enable-debug --enable-werror $C
-  make
-  make "TFLAGS=-n !313 !410 !3001" test-nonflaky
-fi
-
 if [ "$T" = "debug-bearssl" ]; then
   ./configure --enable-debug --enable-werror $C
   make
diff --git a/tests/runtests.pl b/tests/runtests.pl
index 44d58d5f6..232a8824b 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -287,7 +287,6 @@ my $has_sectransp;  # built with Secure Transport
 my $has_boringssl;  # built with BoringSSL
 my $has_libressl;   # built with libressl
 my $has_mbedtls;    # built with mbedTLS
-my $has_mesalink;   # built with MesaLink
 
 my $has_sslpinning; # built with a TLS backend that supports pinning
 
@@ -3033,9 +3032,6 @@ sub checksystem {
                $has_cares=1;
                $resolver="c-ares";
            }
-           if ($libcurl =~ /mesalink/i) {
-               $has_mesalink=1;
-           }
            if ($libcurl =~ /Hyper/i) {
                $has_hyper=1;
            }
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 6d23d806d..52cd65c60 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -222,22 +222,6 @@
         TFLAGS: https ftps
 
 - job:
-    name: curl-debug-mesalink
-    parent: curl-base
-    vars:
-      curl_apt_packages:
-        - libpsl-dev
-        - libbrotli-dev
-        - libzstd-dev
-      curl_env:
-        CC: gcc-8
-        CXX: g++-8
-        T: debug-mesalink
-        MESALINK: "yes"
-        C: >-
-          --with-mesalink
-
-- job:
     name: curl-debug-clang-with-openssl
     parent: curl-base
     vars:
@@ -502,7 +486,6 @@
       - curl-novalgrind-ngtcp2-with-openssl
       - curl-novalgrind-ngtcp2-gnutls
       - curl-debug-openssl3
-      - curl-debug-mesalink
       - curl-debug-clang-with-openssl
       - curl-debug-clang-disable-alt-svc-with-openssl
       - curl-debug-clang-with-gnutls