CA-407177: Fix swtpm's use of SHA1 on XS9

The default crypto policy in XS9 disables use of SHA1. However, swtpm
needs to use it since it advertises SHA1 support to guests. On XS9,
swtpm will ship with a custom openssl configuration file for this
purpose so set the appropriate environment variable to use it if the
file exists.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>

Author: rosslagerwall

ocaml/xenopsd/scripts/swtpm-wrapper

@@ -13,6 +13,7 @@
 # GNU Lesser General Public License for more details.
 
 import os
+import os.path
 import stat
 import socket
 import sys
@@ -140,6 +141,8 @@ def main(argv):
 
     tpm_env = dict(os.environ)
     tpm_env["LD_LIBRARY_PATH"] = "/usr/lib:"
+    if os.path.exists("/etc/ssl/openssl-swtpm.cnf"):
+        tpm_env["OPENSSL_CONF"] = "/etc/ssl/openssl-swtpm.cnf"
 
     if needs_init or check_state_needs_init(tpm_state_file):
         if tpm_file is None: