Issue #21356: Make ssl.RAND_egd() optional to support LibreSSL. The

availability of the function is checked during the compilation.

Patch written by Bernard Spil.

7 files changed, 65 insertions, 3 deletions

diff --git a/Lib/ssl.py b/Lib/ssl.py
index 3d132b2f7ce..9264699886e 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -106,7 +106,12 @@ from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
 from _ssl import (VERIFY_DEFAULT, VERIFY_CRL_CHECK_LEAF, VERIFY_CRL_CHECK_CHAIN,
     VERIFY_X509_STRICT)
 from _ssl import txt2obj as _txt2obj, nid2obj as _nid2obj
-from _ssl import RAND_status, RAND_egd, RAND_add, RAND_bytes, RAND_pseudo_bytes
+from _ssl import RAND_status, RAND_add, RAND_bytes, RAND_pseudo_bytes
+try:
+    from _ssl import RAND_egd
+except ImportError:
+    # LibreSSL does not provide RAND_egd
+    pass
 
 def _import_symbols(prefix):
     for n in dir(_ssl):
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 06705b20835..2a18cc49311 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -168,8 +168,9 @@ class BasicSocketTests(unittest.TestCase):
         self.assertRaises(ValueError, ssl.RAND_bytes, -5)
         self.assertRaises(ValueError, ssl.RAND_pseudo_bytes, -5)
 
-        self.assertRaises(TypeError, ssl.RAND_egd, 1)
-        self.assertRaises(TypeError, ssl.RAND_egd, 'foo', 1)
+        if hasattr(ssl, 'RAND_egd'):
+            self.assertRaises(TypeError, ssl.RAND_egd, 1)
+            self.assertRaises(TypeError, ssl.RAND_egd, 'foo', 1)
         ssl.RAND_add("this is a random string", 75.0)
 
     @unittest.skipUnless(os.name == 'posix', 'requires posix')
diff --git a/Misc/NEWS b/Misc/NEWS
index b3d92b297df..1cf01c94318 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -191,6 +191,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #21356: Make ssl.RAND_egd() optional to support LibreSSL. The
+  availability of the function is checked during the compilation. Patch written
+  by Bernard Spil.
+
 - Issue #22915: SAX parser now supports files opened with file descriptor or
   bytes path.
 
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index de9a5b4e092..29e7469b625 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -3713,6 +3713,7 @@ Returns 1 if the OpenSSL PRNG has been seeded with enough data and 0 if not.\n\
 It is necessary to seed the PRNG with RAND_add() on some platforms before\n\
 using the ssl() function.");
 
+#ifdef HAVE_RAND_EGD
 static PyObject *
 PySSL_RAND_egd(PyObject *self, PyObject *args)
 {
@@ -3740,6 +3741,7 @@ PyDoc_STRVAR(PySSL_RAND_egd_doc,
 Queries the entropy gather daemon (EGD) on the socket named by 'path'.\n\
 Returns number of bytes read.  Raises SSLError if connection to EGD\n\
 fails or if it does not provide enough data to seed PRNG.");
+#endif /* HAVE_RAND_EGD */
 
 #endif /* HAVE_OPENSSL_RAND */
 
@@ -4135,8 +4137,10 @@ static PyMethodDef PySSL_methods[] = {
      PySSL_RAND_bytes_doc},
     {"RAND_pseudo_bytes",   PySSL_RAND_pseudo_bytes, METH_VARARGS,
      PySSL_RAND_pseudo_bytes_doc},
+#ifdef HAVE_RAND_EGD
     {"RAND_egd",            PySSL_RAND_egd, METH_VARARGS,
      PySSL_RAND_egd_doc},
+#endif
     {"RAND_status",         (PyCFunction)PySSL_RAND_status, METH_NOARGS,
      PySSL_RAND_status_doc},
 #endif
diff --git a/configure b/configure
index 44a74778d10..ce0c840dda4 100755
--- a/configure
+++ b/configure
@@ -9046,6 +9046,48 @@ _ACEOF
 
 fi
 	# Dynamic linking for HP-UX
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for RAND_egd in -lcrypto" >&5
+$as_echo_n "checking for RAND_egd in -lcrypto... " >&6; }
+if ${ac_cv_lib_crypto_RAND_egd+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lcrypto  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char RAND_egd ();
+int
+main ()
+{
+return RAND_egd ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_crypto_RAND_egd=yes
+else
+  ac_cv_lib_crypto_RAND_egd=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypto_RAND_egd" >&5
+$as_echo "$ac_cv_lib_crypto_RAND_egd" >&6; }
+if test "x$ac_cv_lib_crypto_RAND_egd" = xyes; then :
+
+$as_echo "#define HAVE_RAND_EGD 1" >>confdefs.h
+
+fi
+
 
 # only check for sem_init if thread support is requested
 if test "$with_threads" = "yes" -o -z "$with_threads"; then
diff --git a/configure.ac b/configure.ac
index c12622bbb99..99d430c100c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2293,6 +2293,9 @@ AC_MSG_RESULT($SHLIBS)
 AC_CHECK_LIB(sendfile, sendfile)
 AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
 AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX
+AC_CHECK_LIB(crypto, RAND_egd,
+             AC_DEFINE(HAVE_RAND_EGD, 1,
+             [Define if the libcrypto has RAND_egd]))
 
 # only check for sem_init if thread support is requested
 if test "$with_threads" = "yes" -o -z "$with_threads"; then
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 9ebea5db29e..d623cebd71f 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -675,6 +675,9 @@
 /* Define to 1 if you have the `pwrite' function. */
 #undef HAVE_PWRITE
 
+/* Define if the libcrypto has RAND_egd */
+#undef HAVE_RAND_EGD
+
 /* Define to 1 if you have the `readlink' function. */
 #undef HAVE_READLINK