From 440a178c5aad19050a3d5b5d76881931138af680 Mon Sep 17 00:00:00 2001

From: Colin Walters <walters@verbum.org>

Date: Fri, 7 Jun 2019 18:44:43 +0000

Subject: [PATCH 1/2] ghmac: Split off wrapper functions into ghmac-utils.c

Prep for adding a GnuTLS HMAC implementation; these are just

utility functions that call the "core" API.

---

 glib/Makefile.am   |   1 +

 glib/ghmac-utils.c | 145 +++++++++++++++++++++++++++++++++++++++++++++

 glib/ghmac.c       | 112 ----------------------------------

 glib/meson.build   |   1 +

 4 files changed, 147 insertions(+), 112 deletions(-)

 create mode 100644 glib/ghmac-utils.c

diff --git a/glib/Makefile.am b/glib/Makefile.am

index 8da549c7f..c367b09ad 100644

--- a/glib/Makefile.am

+++ b/glib/Makefile.am

@@ -126,6 +126,7 @@ libglib_2_0_la_SOURCES = 	\

 	ggettext.c		\

 	ghash.c			\

 	ghmac.c			\

+	ghmac-utils.c		\

 	ghook.c			\

 	ghostutils.c		\

 	giochannel.c    	\

diff --git a/glib/ghmac-utils.c b/glib/ghmac-utils.c

new file mode 100644

index 000000000..a17359ff1

--- /dev/null

+++ b/glib/ghmac-utils.c

@@ -0,0 +1,145 @@

+/* ghmac.h - data hashing functions

+ *

+ * Copyright (C) 2011  Collabora Ltd.

+ * Copyright (C) 2019  Red Hat, Inc.

+ *

+ * This library is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Lesser General Public

+ * License as published by the Free Software Foundation; either

+ * version 2.1 of the License, or (at your option) any later version.

+ *

+ * This library is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

+ * Lesser General Public License for more details.

+ *

+ * You should have received a copy of the GNU Lesser General Public License

+ * along with this library; if not, see <http://www.gnu.org/licenses/>.

+ */

+

+#include "config.h"

+

+#include <string.h>

+

+#include "ghmac.h"

+

+#include "glib/galloca.h"

+#include "gatomic.h"

+#include "gslice.h"

+#include "gmem.h"

+#include "gstrfuncs.h"

+#include "gtestutils.h"

+#include "gtypes.h"

+#include "glibintl.h"

+

+/**

+ * g_compute_hmac_for_data:

+ * @digest_type: a #GChecksumType to use for the HMAC

+ * @key: (array length=key_len): the key to use in the HMAC

+ * @key_len: the length of the key

+ * @data: (array length=length): binary blob to compute the HMAC of

+ * @length: length of @data

+ *

+ * Computes the HMAC for a binary @data of @length. This is a

+ * convenience wrapper for g_hmac_new(), g_hmac_get_string()

+ * and g_hmac_unref().

+ *

+ * The hexadecimal string returned will be in lower case.

+ *

+ * Returns: the HMAC of the binary data as a string in hexadecimal.

+ *   The returned string should be freed with g_free() when done using it.

+ *

+ * Since: 2.30

+ */

+gchar *

+g_compute_hmac_for_data (GChecksumType  digest_type,

+                         const guchar  *key,

+                         gsize          key_len,

+                         const guchar  *data,

+                         gsize          length)

+{

+  GHmac *hmac;

+  gchar *retval;

+

+  g_return_val_if_fail (length == 0 || data != NULL, NULL);

+

+  hmac = g_hmac_new (digest_type, key, key_len);

+  if (!hmac)

+    return NULL;

+

+  g_hmac_update (hmac, data, length);

+  retval = g_strdup (g_hmac_get_string (hmac));

+  g_hmac_unref (hmac);

+

+  return retval;

+}

+

+/**

+ * g_compute_hmac_for_bytes:

+ * @digest_type: a #GChecksumType to use for the HMAC

+ * @key: the key to use in the HMAC

+ * @data: binary blob to compute the HMAC of

+ *

+ * Computes the HMAC for a binary @data. This is a

+ * convenience wrapper for g_hmac_new(), g_hmac_get_string()

+ * and g_hmac_unref().

+ *

+ * The hexadecimal string returned will be in lower case.

+ *

+ * Returns: the HMAC of the binary data as a string in hexadecimal.

+ *   The returned string should be freed with g_free() when done using it.

+ *

+ * Since: 2.50

+ */

+gchar *

+g_compute_hmac_for_bytes (GChecksumType  digest_type,

+                          GBytes        *key,

+                          GBytes        *data)

+{

+  gconstpointer byte_data;

+  gsize length;

+  gconstpointer key_data;

+  gsize key_len;

+

+  g_return_val_if_fail (data != NULL, NULL);

+  g_return_val_if_fail (key != NULL, NULL);

+

+  byte_data = g_bytes_get_data (data, &length);

+  key_data = g_bytes_get_data (key, &key_len);

+  return g_compute_hmac_for_data (digest_type, key_data, key_len, byte_data, length);

+}

+

+

+/**

+ * g_compute_hmac_for_string:

+ * @digest_type: a #GChecksumType to use for the HMAC

+ * @key: (array length=key_len): the key to use in the HMAC

+ * @key_len: the length of the key

+ * @str: the string to compute the HMAC for

+ * @length: the length of the string, or -1 if the string is nul-terminated

+ *

+ * Computes the HMAC for a string.

+ *

+ * The hexadecimal string returned will be in lower case.

+ *

+ * Returns: the HMAC as a hexadecimal string.

+ *     The returned string should be freed with g_free()

+ *     when done using it.

+ *

+ * Since: 2.30

+ */

+gchar *

+g_compute_hmac_for_string (GChecksumType  digest_type,

+                           const guchar  *key,

+                           gsize          key_len,

+                           const gchar   *str,

+                           gssize         length)

+{

+  g_return_val_if_fail (length == 0 || str != NULL, NULL);

+

+  if (length < 0)

+    length = strlen (str);

+

+  return g_compute_hmac_for_data (digest_type, key, key_len,

+                                  (const guchar *) str, length);

+}

diff --git a/glib/ghmac.c b/glib/ghmac.c

index 9b58fd81c..7db38e34a 100644

--- a/glib/ghmac.c

+++ b/glib/ghmac.c

@@ -329,115 +329,3 @@ g_hmac_get_digest (GHmac  *hmac,

   g_checksum_update (hmac->digesto, buffer, len);

   g_checksum_get_digest (hmac->digesto, buffer, digest_len);

 }

-

-/**

- * g_compute_hmac_for_data:

- * @digest_type: a #GChecksumType to use for the HMAC

- * @key: (array length=key_len): the key to use in the HMAC

- * @key_len: the length of the key

- * @data: (array length=length): binary blob to compute the HMAC of

- * @length: length of @data

- *

- * Computes the HMAC for a binary @data of @length. This is a

- * convenience wrapper for g_hmac_new(), g_hmac_get_string()

- * and g_hmac_unref().

- *

- * The hexadecimal string returned will be in lower case.

- *

- * Returns: the HMAC of the binary data as a string in hexadecimal.

- *   The returned string should be freed with g_free() when done using it.

- *

- * Since: 2.30

- */

-gchar *

-g_compute_hmac_for_data (GChecksumType  digest_type,

-                         const guchar  *key,

-                         gsize          key_len,

-                         const guchar  *data,

-                         gsize          length)

-{

-  GHmac *hmac;

-  gchar *retval;

-

-  g_return_val_if_fail (length == 0 || data != NULL, NULL);

-

-  hmac = g_hmac_new (digest_type, key, key_len);

-  if (!hmac)

-    return NULL;

-

-  g_hmac_update (hmac, data, length);

-  retval = g_strdup (g_hmac_get_string (hmac));

-  g_hmac_unref (hmac);

-

-  return retval;

-}

-

-/**

- * g_compute_hmac_for_bytes:

- * @digest_type: a #GChecksumType to use for the HMAC

- * @key: the key to use in the HMAC

- * @data: binary blob to compute the HMAC of

- *

- * Computes the HMAC for a binary @data. This is a

- * convenience wrapper for g_hmac_new(), g_hmac_get_string()

- * and g_hmac_unref().

- *

- * The hexadecimal string returned will be in lower case.

- *

- * Returns: the HMAC of the binary data as a string in hexadecimal.

- *   The returned string should be freed with g_free() when done using it.

- *

- * Since: 2.50

- */

-gchar *

-g_compute_hmac_for_bytes (GChecksumType  digest_type,

-                          GBytes        *key,

-                          GBytes        *data)

-{

-  gconstpointer byte_data;

-  gsize length;

-  gconstpointer key_data;

-  gsize key_len;

-

-  g_return_val_if_fail (data != NULL, NULL);

-  g_return_val_if_fail (key != NULL, NULL);

-

-  byte_data = g_bytes_get_data (data, &length);

-  key_data = g_bytes_get_data (key, &key_len);

-  return g_compute_hmac_for_data (digest_type, key_data, key_len, byte_data, length);

-}

-

-

-/**

- * g_compute_hmac_for_string:

- * @digest_type: a #GChecksumType to use for the HMAC

- * @key: (array length=key_len): the key to use in the HMAC

- * @key_len: the length of the key

- * @str: the string to compute the HMAC for

- * @length: the length of the string, or -1 if the string is nul-terminated

- *

- * Computes the HMAC for a string.

- *

- * The hexadecimal string returned will be in lower case.

- *

- * Returns: the HMAC as a hexadecimal string.

- *     The returned string should be freed with g_free()

- *     when done using it.

- *

- * Since: 2.30

- */

-gchar *

-g_compute_hmac_for_string (GChecksumType  digest_type,

-                           const guchar  *key,

-                           gsize          key_len,

-                           const gchar   *str,

-                           gssize         length)

-{

-  g_return_val_if_fail (length == 0 || str != NULL, NULL);

-

-  if (length < 0)

-    length = strlen (str);

-

-  return g_compute_hmac_for_data (digest_type, key, key_len,

-                                  (const guchar *) str, length);

-}

diff --git a/glib/meson.build b/glib/meson.build

index 9df77b6f9..c7f28b5b6 100644

--- a/glib/meson.build

+++ b/glib/meson.build

@@ -138,6 +138,7 @@ glib_sources = files(

   'ggettext.c',

   'ghash.c',

   'ghmac.c',

+  'ghmac-utils.c',

   'ghook.c',

   'ghostutils.c',

   'giochannel.c',

-- 

2.21.0

From 423355787ba9133b310c0b72708024b1428d7d14 Mon Sep 17 00:00:00 2001

From: Colin Walters <walters@verbum.org>

Date: Fri, 7 Jun 2019 19:36:54 +0000

Subject: [PATCH 2/2] Add a gnutls backend for GHmac

For RHEL we want apps to use FIPS-certified crypto libraries,

and HMAC apparently counts as "keyed" and hence needs to

be validated.

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1630260

Replaces: https://gitlab.gnome.org/GNOME/glib/merge_requests/897

This is a build-time option that backs the GHmac API with GnuTLS.

Most distributors ship glib-networking built with GnuTLS, and

most apps use glib-networking, so this isn't a net-new library

in most cases.

However, a fun wrinkle is that the GnuTLS HMAC API doesn't expose

the necessary bits to implement `g_hmac_copy()`; OpenSSL does.

I chose to just make that abort for now since I didn't find

apps using it.

---

 glib/Makefile.am        |   9 ++-

 glib/gchecksum.c        |   9 +--

 glib/gchecksumprivate.h |  32 +++++++++

 glib/ghmac-gnutls.c     | 151 ++++++++++++++++++++++++++++++++++++++++

 glib/ghmac.c            |   1 +

 glib/meson.build        |  10 ++-

 glib/tests/hmac.c       |   6 ++

 meson.build             |   7 ++

 meson_options.txt       |   5 ++

 9 files changed, 221 insertions(+), 9 deletions(-)

 create mode 100644 glib/gchecksumprivate.h

 create mode 100644 glib/ghmac-gnutls.c

diff --git a/glib/Makefile.am b/glib/Makefile.am

index c367b09ad..b0a721ad0 100644

--- a/glib/Makefile.am

+++ b/glib/Makefile.am

@@ -125,7 +125,7 @@ libglib_2_0_la_SOURCES = 	\

 	gfileutils.c		\

 	ggettext.c		\

 	ghash.c			\

-	ghmac.c			\

+	ghmac-gnutls.c		\

 	ghmac-utils.c		\

 	ghook.c			\

 	ghostutils.c		\

@@ -352,11 +352,14 @@ pcre_lib = pcre/libpcre.la

 pcre_inc =

 endif

-libglib_2_0_la_CFLAGS = $(AM_CFLAGS) $(GLIB_HIDDEN_VISIBILITY_CFLAGS) $(LIBSYSTEMD_CFLAGS)

+gnutls_libs = $(shell pkg-config --libs gnutls)

+gnutls_cflags = $(shell pkg-config --cflags gnutls)

+

+libglib_2_0_la_CFLAGS = $(AM_CFLAGS) $(GLIB_HIDDEN_VISIBILITY_CFLAGS) $(LIBSYSTEMD_CFLAGS) $(gnutls_cflags)

 libglib_2_0_la_LIBADD = libcharset/libcharset.la $(printf_la) @GIO@ @GSPAWN@ @PLATFORMDEP@ @ICONV_LIBS@ @G_LIBS_EXTRA@ $(pcre_lib) $(G_THREAD_LIBS_EXTRA) $(G_THREAD_LIBS_FOR_GTHREAD) $(LIBSYSTEMD_LIBS)

 libglib_2_0_la_DEPENDENCIES = libcharset/libcharset.la $(printf_la) @GIO@ @GSPAWN@ @PLATFORMDEP@ $(glib_win32_res) $(glib_def)

-libglib_2_0_la_LDFLAGS = $(GLIB_LINK_FLAGS) \

+libglib_2_0_la_LDFLAGS = $(GLIB_LINK_FLAGS) $(gnutls_libs) \

 	 $(glib_win32_res_ldflag) \

 	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE) \

 	-export-dynamic $(no_undefined)

diff --git a/glib/gchecksum.c b/glib/gchecksum.c

index 40b1d50e2..2f59d4a66 100644

--- a/glib/gchecksum.c

+++ b/glib/gchecksum.c

@@ -20,7 +20,7 @@

 #include <string.h>

-#include "gchecksum.h"

+#include "gchecksumprivate.h"

 #include "gslice.h"

 #include "gmem.h"

@@ -173,9 +173,9 @@ sha_byte_reverse (guint32 *buffer,

 }

 #endif /* G_BYTE_ORDER == G_BIG_ENDIAN */

-static gchar *

-digest_to_string (guint8 *digest,

-                  gsize   digest_len)

+gchar *

+gchecksum_digest_to_string (guint8 *digest,

+                            gsize   digest_len)

 {

   gint len = digest_len * 2;

   gint i;

@@ -195,6 +195,7 @@ digest_to_string (guint8 *digest,

   return retval;

 }

+#define digest_to_string gchecksum_digest_to_string

 /*

  * MD5 Checksum

diff --git a/glib/gchecksumprivate.h b/glib/gchecksumprivate.h

new file mode 100644

index 000000000..86c7a3b61

--- /dev/null

+++ b/glib/gchecksumprivate.h

@@ -0,0 +1,32 @@

+/* gstdioprivate.h - Private GLib stdio functions

+ *

+ * Copyright 2017 Руслан Ижбулатов

+ *

+ * This library is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Lesser General Public

+ * License as published by the Free Software Foundation; either

+ * version 2.1 of the License, or (at your option) any later version.

+ *

+ * This library is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

+ * Lesser General Public License for more details.

+ *

+ * You should have received a copy of the GNU Lesser General Public License

+ * along with this library; if not, see <http://www.gnu.org/licenses/>.

+ */

+

+#ifndef __G_CHECKSUMPRIVATE_H__

+#define __G_CHECKSUMPRIVATE_H__

+

+#include "gchecksum.h"

+

+G_BEGIN_DECLS

+

+gchar *

+gchecksum_digest_to_string (guint8 *digest,

+                            gsize   digest_len);

+

+G_END_DECLS

+

+#endif

\ No newline at end of file

diff --git a/glib/ghmac-gnutls.c b/glib/ghmac-gnutls.c

new file mode 100644

index 000000000..3b4dfb872

--- /dev/null

+++ b/glib/ghmac-gnutls.c

@@ -0,0 +1,151 @@

+/* ghmac.h - data hashing functions

+ *

+ * Copyright (C) 2011  Collabora Ltd.

+ * Copyright (C) 2019  Red Hat, Inc.

+ *

+ * This library is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Lesser General Public

+ * License as published by the Free Software Foundation; either

+ * version 2.1 of the License, or (at your option) any later version.

+ *

+ * This library is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

+ * Lesser General Public License for more details.

+ *

+ * You should have received a copy of the GNU Lesser General Public License

+ * along with this library; if not, see <http://www.gnu.org/licenses/>.

+ */

+

+#include "config.h"

+

+#include <string.h>

+#include <gnutls/crypto.h>

+

+#include "ghmac.h"

+

+#include "glib/galloca.h"

+#include "gatomic.h"

+#include "gslice.h"

+#include "gmem.h"

+#include "gstrfuncs.h"

+#include "gchecksumprivate.h"

+#include "gtestutils.h"

+#include "gtypes.h"

+#include "glibintl.h"

+

+struct _GHmac

+{

+  int ref_count;

+  GChecksumType digest_type;

+  gnutls_hmac_hd_t hmac;

+  gchar *digest_str;

+};

+

+GHmac *

+g_hmac_new (GChecksumType  digest_type,

+            const guchar  *key,

+            gsize          key_len)

+{

+  gnutls_mac_algorithm_t algo;

+  GHmac *hmac = g_slice_new0 (GHmac);

+  hmac->ref_count = 1;

+  hmac->digest_type = digest_type;  

+

+  switch (digest_type)

+    {

+    case G_CHECKSUM_MD5:

+      algo = GNUTLS_MAC_MD5;

+      break;

+    case G_CHECKSUM_SHA1:

+      algo = GNUTLS_MAC_SHA1;

+      break;

+    case G_CHECKSUM_SHA256:

+      algo = GNUTLS_MAC_SHA256;

+      break;

+    case G_CHECKSUM_SHA384:

+      algo = GNUTLS_MAC_SHA384;

+      break;

+    case G_CHECKSUM_SHA512:

+      algo = GNUTLS_MAC_SHA512;

+      break;

+    default:

+      g_return_val_if_reached (NULL);

+    }

+

+  gnutls_hmac_init (&hmac->hmac, algo, key, key_len);

+

+  return hmac;

+}

+

+GHmac *

+g_hmac_copy (const GHmac *hmac)

+{

+  g_error ("g_hmac_copy is not available with GnuTLS-backend GHmac");

+}

+

+GHmac *

+g_hmac_ref (GHmac *hmac)

+{

+  g_return_val_if_fail (hmac != NULL, NULL);

+

+  g_atomic_int_inc (&hmac->ref_count);

+

+  return hmac;

+}

+

+void

+g_hmac_unref (GHmac *hmac)

+{

+  g_return_if_fail (hmac != NULL);

+

+  if (g_atomic_int_dec_and_test (&hmac->ref_count))

+    {

+      gnutls_hmac_deinit (hmac->hmac, NULL);

+      g_free (hmac->digest_str);

+      g_slice_free (GHmac, hmac);

+    }

+}

+

+

+void

+g_hmac_update (GHmac        *hmac,

+               const guchar *data,

+               gssize        length)

+{

+  g_return_if_fail (hmac != NULL);

+  g_return_if_fail (length == 0 || data != NULL);

+

+  gnutls_hmac (hmac->hmac, data, length);

+}

+

+const gchar *

+g_hmac_get_string (GHmac *hmac)

+{

+  guint8 *buffer;

+  gsize digest_len;

+

+  g_return_val_if_fail (hmac != NULL, NULL);

+

+  if (hmac->digest_str)

+    return hmac->digest_str;

+

+  digest_len = g_checksum_type_get_length (hmac->digest_type);

+  buffer = g_alloca (digest_len);

+

+  gnutls_hmac_output (hmac->hmac, buffer);

+  hmac->digest_str = gchecksum_digest_to_string (buffer, digest_len);

+  return hmac->digest_str;

+}

+

+

+void

+g_hmac_get_digest (GHmac  *hmac,

+                   guint8 *buffer,

+                   gsize  *digest_len)

+{

+  g_return_if_fail (hmac != NULL);

+

+  gnutls_hmac_output (hmac->hmac, buffer);

+  *digest_len = g_checksum_type_get_length (hmac->digest_type);

+}

diff --git a/glib/ghmac.c b/glib/ghmac.c

index 7db38e34a..b12eb07c4 100644

--- a/glib/ghmac.c

+++ b/glib/ghmac.c

@@ -33,6 +33,7 @@

 #include "gtypes.h"

 #include "glibintl.h"

+#error "build configuration error"

 /**

  * SECTION:hmac

diff --git a/glib/meson.build b/glib/meson.build

index c7f28b5b6..a2f9da81c 100644

--- a/glib/meson.build

+++ b/glib/meson.build

@@ -137,7 +137,6 @@ glib_sources = files(

   'gfileutils.c',

   'ggettext.c',

   'ghash.c',

-  'ghmac.c',

   'ghmac-utils.c',

   'ghook.c',

   'ghostutils.c',

@@ -185,6 +184,7 @@ glib_sources = files(

   'gunidecomp.c',

   'gurifuncs.c',

   'gutils.c',

+  'gchecksumprivate.h',

   'guuid.c',

   'gvariant.c',

   'gvariant-core.c',

@@ -222,6 +222,12 @@ else

   glib_dtrace_hdr = []

 endif

+if get_option('gnutls')

+  glib_sources += files('ghmac-gnutls.c')

+else

+  glib_sources += files('ghmac.c')

+endif

+

 pcre_static_args = []

 if use_pcre_static_flag

@@ -238,7 +244,7 @@ libglib = library('glib-2.0',

   link_args : platform_ldflags + noseh_link_args,

   include_directories : configinc,

   link_with : [charset_lib, gnulib_lib],

-  dependencies : [pcre, thread_dep, libintl, librt] + libiconv + platform_deps,

+  dependencies : [pcre, thread_dep, libintl, librt] + libiconv + platform_deps + libgnutls_dep,

   c_args : ['-DG_LOG_DOMAIN="GLib"', '-DGLIB_COMPILATION'] + pcre_static_args + glib_hidden_visibility_args

 )

diff --git a/glib/tests/hmac.c b/glib/tests/hmac.c

index 3ac3206df..5212c2523 100644

--- a/glib/tests/hmac.c

+++ b/glib/tests/hmac.c

@@ -1,3 +1,5 @@

+#include "config.h"

+

 #include <glib.h>

 #include <string.h>

 #include <stdlib.h>

@@ -427,6 +429,9 @@ test_hmac_ref_unref (void)

 static void

 test_hmac_copy (void)

 {

+#ifdef HAVE_GNUTLS

+  g_test_skip ("No g_hmac_copy with gnutls");

+#else

   GHmac *hmac, *check;

   hmac = g_hmac_new (G_CHECKSUM_SHA256, (guchar*)"aaa", 3);

@@ -435,6 +440,7 @@ test_hmac_copy (void)

   g_assert_cmpstr (g_hmac_get_string (hmac), ==, g_hmac_get_string (check));

   g_hmac_unref (check);

   g_hmac_unref (hmac);

+#endif

 }

 static void

diff --git a/meson.build b/meson.build

index 0cefee51d..81b16b004 100644

--- a/meson.build

+++ b/meson.build

@@ -1596,6 +1596,13 @@ if host_system == 'linux' and get_option('libmount')

   libmount_dep = [dependency('mount', version : '>=2.23', required : true)]

 endif

+# gnutls is used optionally by ghmac

+libgnutls_dep = []

+if get_option('gnutls')

+  libgnutls_dep = [dependency('gnutls', version : '>=3.6.7', required : true)]

+  glib_conf.set('HAVE_GNUTLS', 1)

+endif

+

 if host_system == 'windows'

   winsock2 = cc.find_library('ws2_32')

 endif

diff --git a/meson_options.txt b/meson_options.txt

index 4504c6858..d18c42a36 100644

--- a/meson_options.txt

+++ b/meson_options.txt

@@ -34,6 +34,11 @@ option('libmount',

        value : true,

        description : 'build with libmount support')

+option('gnutls',

+       type : 'boolean',