From: Kirill Isakov <bootctl@gmail.com>
Date: Mon, 2 May 2022 09:41:03 +0000 (+0600)
Subject: gcrypt: initialize secure memory on startup
X-Git-Url: https://git.tinc-vpn.org/git/browse?a=commitdiff_plain;h=c32235ac0ef4ce8af77d59c6186436c49c3d7386;p=tinc

gcrypt: initialize secure memory on startup

Otherwise libgcrypt does it automatically, but only after we drop
privileges. This requires calling mlock(), which kills the sandboxed
process on OpenBSD.

If this is not enough, libgcrypt will resize the pool without calling
mlock().
---

diff --git a/src/gcrypt/crypto.c b/src/gcrypt/crypto.c
new file mode 100644
index 00000000..815bedf1
--- /dev/null
+++ b/src/gcrypt/crypto.c
@@ -0,0 +1,10 @@
+#include "../system.h"
+
+#include <gcrypt.h>
+
+#include "../crypto.h"
+
+void crypto_init(void) {
+	gcry_control(GCRYCTL_INIT_SECMEM, 32 * 1024, 0);
+	gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
+}
diff --git a/src/gcrypt/meson.build b/src/gcrypt/meson.build
index 9cfe466e..ac93c809 100644
--- a/src/gcrypt/meson.build
+++ b/src/gcrypt/meson.build
@@ -1,5 +1,6 @@
 src_lib_crypto = files(
   'cipher.c',
+  'crypto.c',
   'digest.c',
   'pem.c',
   'prf.c',
diff --git a/src/meson.build b/src/meson.build
index 564ef6fc..d9f7b14b 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -358,10 +358,6 @@ endif
 
 subdir(opt_crypto)
 
-if opt_crypto != 'openssl'
-  src_lib_crypto += 'crypto.c'
-endif
-
 if opt_crypto != 'nolegacy'
   src_lib_crypto += ['cipher.c', 'digest.c']
 endif
diff --git a/src/crypto.c b/src/nolegacy/crypto.c
similarity index 97%
rename from src/crypto.c
rename to src/nolegacy/crypto.c
index 20d917d9..4e6f427a 100644
--- a/src/crypto.c
+++ b/src/nolegacy/crypto.c
@@ -17,7 +17,7 @@
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include "crypto.h"
+#include "../crypto.h"
 
 // No-op for those cryptographic libraries that
 // do not require any additional initialization.
diff --git a/src/nolegacy/meson.build b/src/nolegacy/meson.build
index c9ea62f4..323a8314 100644
--- a/src/nolegacy/meson.build
+++ b/src/nolegacy/meson.build
@@ -1,4 +1,7 @@
-src_lib_crypto = files('prf.c')
+src_lib_crypto = files(
+  'crypto.c',
+  'prf.c',
+)
 
 dep_crypto = dependency('', required: false)