Use system-wide crypto-policies on Fedora

HTTPS connections from IPA framework and bind named instance now use
system-wide crypto-policies on Fedora.

For HTTPS the 'DEFAULT' crypto policy also includes unnecessary ciphers
for PSK, SRP, aDSS and 3DES. Since these ciphers are not used by freeIPA,
they are explicitly excluded.

See: https://bugzilla.redhat.com/show_bug.cgi?id=1179925
See: https://bugzilla.redhat.com/show_bug.cgi?id=1179220
Fixes: https://pagure.io/freeipa/issue/4853
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipaplatform/base/constants.py

@@ -42,6 +42,9 @@ class BaseConstantsNamespace(object):
     # WSGI module override, only used on Fedora
     MOD_WSGI_PYTHON2 = None
     MOD_WSGI_PYTHON3 = None
+    # high ciphers without RC4, MD5, TripleDES, pre-shared key, secure
+    # remote password, and DSA cert authentication.
+    TLS_HIGH_CIPHERS = "HIGH:!aNULL:!eNULL:!MD5:!RC4:!3DES:!PSK:!SRP:!aDSS"
 
 
 constants = BaseConstantsNamespace()

ipaplatform/base/paths.py

@@ -81,6 +81,7 @@ class BasePathNamespace(object):
     NAMED_ROOT_KEY = "/etc/named.root.key"
     NAMED_BINDKEYS_FILE = "/etc/named.iscdlv.key"
     NAMED_MANAGED_KEYS_DIR = "/var/named/dynamic"
+    NAMED_CRYPTO_POLICY_FILE = None
     NSLCD_CONF = "/etc/nslcd.conf"
     NSS_LDAP_CONF = "/etc/nss_ldap.conf"
     NSSWITCH_CONF = "/etc/nsswitch.conf"

ipaplatform/fedora/constants.py

@@ -16,5 +16,10 @@ class FedoraConstantsNamespace(RedHatConstantsNamespace):
     MOD_WSGI_PYTHON2 = "modules/mod_wsgi.so"
     MOD_WSGI_PYTHON3 = "modules/mod_wsgi_python3.so"
 
+    # System-wide crypto policy, but without TripleDES, pre-shared key,
+    # secure remote password, and DSA cert authentication.
+    # see https://fedoraproject.org/wiki/Changes/CryptoPolicy
+    TLS_HIGH_CIPHERS = "PROFILE=SYSTEM:!3DES:!PSK:!SRP:!aDSS"
+
 
 constants = FedoraConstantsNamespace()

ipaplatform/fedora/paths.py

@@ -30,6 +30,7 @@ class FedoraPathNamespace(RedHatPathNamespace):
     HTTPD_IPA_WSGI_MODULES_CONF = (
         "/etc/httpd/conf.modules.d/02-ipa-wsgi.conf"
     )
+    NAMED_CRYPTO_POLICY_FILE = "/etc/crypto-policies/back-ends/bind.config"
 
 
 paths = FedoraPathNamespace()