[users] sample config and stub function for libpwquality

src/modules/users/CheckPWQuality.cpp

@@ -89,6 +89,18 @@ DEFINE_CHECK_FUNC(maxLength)
 #ifdef HAVE_LIBPWQUALITY
 DEFINE_CHECK_FUNC(libpwquality)
 {
+    if ( !value.canConvert( QVariant::List ) )
+    {
+        cDebug() << "WARNING: libpwquality settings is not a list";
+        return;
+    }
 
+    QVariantList l = value.toList();
+    unsigned int requirement_count = 0;
+    for ( const auto& v : l )
+    {
+        cDebug() << " .. " << v.type() << v;
+        // TODO: pass strings on to libpwquality
+    }
 }
 #endif

src/modules/users/UsersPage.cpp

@@ -473,5 +473,5 @@ UsersPage::addPasswordCheck( const QString& key, const QVariant& value )
     }
 #endif
     else
-        cDebug() << "WARNING: Unknown password-check key" << '"' << key << '"';
+        cDebug() << "WARNING: Unknown password-check key" << key;
 }

src/modules/users/users.conf

@@ -58,7 +58,19 @@ doReusePassword: true
 # (e.g. specifying a maximum length less than the minimum length
 # will annoy users).
 #
-# (additional checks may be implemented in UsersPage.cpp)
+# The libpwquality check relies on the (optional) libpwquality library.
+# Its value is a list of configuration statements that could also
+# be found in pwquality.conf, and these are handed off to the
+# libpwquality parser for evaluation. The check is ignored if
+# libpwquality is not available at build time (generates a warning in
+# the log). The Calamares password check rejects passwords with a
+# score of < 40 with the given libpwquality settings.
+#
+# (additional checks may be implemented in CheckPWQuality.cpp and
+# wired into UsersPage.cpp)
 passwordRequirements:
     minLength: -1  # Password at least this many characters
     maxLength: -1  # Password at most this many characters
+    libpwquality:
+        - minlen=8
+        - minclass=2