Set permission to certs to allow correct removing on win

qgis · May 31, 2018 · 878ab41 · 878ab41
1 parent 25ba361
commit 878ab41
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Showing 2 changed files with 55 additions and 39 deletions.
diff --git a/python/plugins/db_manager/db_plugins/postgis/connector.py b/python/plugins/db_manager/db_plugins/postgis/connector.py
@@ -26,7 +26,7 @@
 
 from functools import cmp_to_key
 
-from qgis.PyQt.QtCore import QRegExp
+from qgis.PyQt.QtCore import QRegExp, QFile
 from qgis.core import Qgis, QgsCredentials, QgsDataSourceUri
 
 from ..connector import DBConnector
@@ -66,7 +66,8 @@ def __init__(self, uri):
         try:
             self.connection = psycopg2.connect(expandedConnInfo)
         except self.connection_error_types() as e:
-            err = str(e)
+            # get credentials if cached or assking to the user no more than 3 times
+            err = unicode(e)
             uri = self.uri()
             conninfo = uri.connectionInfo(False)
 
@@ -88,44 +89,13 @@ def __init__(self, uri):
                 except self.connection_error_types() as e:
                     if i == 2:
                         raise ConnectionError(e)
-
-                    err = str(e)
+                    err = unicode(e)
                 finally:
-                    # remove certs (if any) of the expanded connectionInfo
-                    expandedUri = QgsDataSourceUri(newExpandedConnInfo)
-
-                    sslCertFile = expandedUri.param("sslcert")
-                    if sslCertFile:
-                        sslCertFile = sslCertFile.replace("'", "")
-                        os.remove(sslCertFile)
-
-                    sslKeyFile = expandedUri.param("sslkey")
-                    if sslKeyFile:
-                        sslKeyFile = sslKeyFile.replace("'", "")
-                        os.remove(sslKeyFile)
-
-                    sslCAFile = expandedUri.param("sslrootcert")
-                    if sslCAFile:
-                        sslCAFile = sslCAFile.replace("'", "")
-                        os.remove(sslCAFile)
+                    # clear certs for each time trying to connect
+                    self._clearSslTempCertsIfAny(newExpandedConnInfo)
         finally:
-            # remove certs (if any) of the expanded connectionInfo
-            expandedUri = QgsDataSourceUri(expandedConnInfo)
-
-            sslCertFile = expandedUri.param("sslcert")
-            if sslCertFile:
-                sslCertFile = sslCertFile.replace("'", "")
-                os.remove(sslCertFile)
-
-            sslKeyFile = expandedUri.param("sslkey")
-            if sslKeyFile:
-                sslKeyFile = sslKeyFile.replace("'", "")
-                os.remove(sslKeyFile)
-
-            sslCAFile = expandedUri.param("sslrootcert")
-            if sslCAFile:
-                sslCAFile = sslCAFile.replace("'", "")
-                os.remove(sslCAFile)
+            # clear certs of the first connection try
+            self._clearSslTempCertsIfAny(expandedConnInfo)
 
         self.connection.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
 
@@ -141,6 +111,33 @@ def __init__(self, uri):
     def _connectionInfo(self):
         return str(self.uri().connectionInfo(True))
 
+    def _clearSslTempCertsIfAny(self, connectionInfo):
+        # remove certs (if any) of the connectionInfo
+        expandedUri = QgsDataSourceUri(connectionInfo)
+
+        def removeCert(certFile):
+            certFile = certFile.replace("'", "")
+            file = QFile(certFile)
+            # set permission to allow removing on Win.
+            # On linux and Mac if file is set with QFile::>ReadUser
+            # does not create problem removing certs
+            if not file.setPermissions(QFile.WriteOwner):
+                raise Exception('Cannot change permissions on {}: error code: {}'.format(file.fileName(), file.error()))
+            if not file.remove():
+                raise Exception('Cannot remove {}: error code: {}'.format(file.fileName(), file.error()))
+
+        sslCertFile = expandedUri.param("sslcert")
+        if sslCertFile:
+            removeCert(sslCertFile)
+
+        sslKeyFile = expandedUri.param("sslkey")
+        if sslKeyFile:
+            removeCert(sslKeyFile)
+
+        sslCAFile = expandedUri.param("sslrootcert")
+        if sslCAFile:
+            removeCert(sslCAFile)
+
     def _checkSpatial(self):
         """ check whether postgis_version is present in catalog """
         c = self._execute(None, u"SELECT COUNT(*) FROM pg_proc WHERE proname = 'postgis_version'")

diff --git a/src/providers/postgres/qgspostgresconn.cpp b/src/providers/postgres/qgspostgresconn.cpp
@@ -242,7 +242,26 @@ QgsPostgresConn::QgsPostgresConn( const QString &conninfo, bool readOnly, bool s
     {
       QString fileName = expandedUri.param( param );
       fileName.remove( QStringLiteral( "'" ) );
-      QFile::remove( fileName );
+      QFile file( fileName );
+      // set minimal permission to allow removing on Win.
+      // On linux and Mac if file is set with QFile::>ReadUser
+      // does not create problem removin certs
+      if ( !file.setPermissions( QFile::WriteOwner ) )
+      {
+        QString errorMsg = tr( "Cannot set WriteOwner permission to cert: %0 to allow removing it" ).arg( file.fileName() );
+        PQfinish();
+        QgsMessageLog::logMessage( tr( "Client security failure" ) + '\n' + errorMsg, tr( "PostGIS" ) );
+        mRef = 0;
+        return;
+      }
+      if ( !file.remove() )
+      {
+        QString errorMsg = tr( "Cannot remove cert: %0" ).arg( file.fileName() );
+        PQfinish();
+        QgsMessageLog::logMessage( tr( "Client security failure" ) + '\n' + errorMsg, tr( "PostGIS" ) );
+        mRef = 0;
+        return;
+      }
     }
   }