diff -up cups-2.2.4/scheduler/ipp.c.substitute-bad-attrs cups-2.2.4/scheduler/ipp.c

--- cups-2.2.4/scheduler/ipp.c.substitute-bad-attrs	2018-04-12 08:44:42.202592413 +0200

+++ cups-2.2.4/scheduler/ipp.c	2018-04-12 08:46:21.347689359 +0200

@@ -164,6 +164,7 @@ cupsdProcessIPPRequest(

   ipp_attribute_t	*uri = NULL;	/* Printer or job URI attribute */

   ipp_attribute_t	*username;	/* requesting-user-name attr */

   int			sub_id;		/* Subscription ID */

+  int			valid = 1;	/* Valid request? */

   cupsdLogMessage(CUPSD_LOG_DEBUG2,

@@ -402,20 +403,55 @@ cupsdProcessIPPRequest(

       else

       {

        /*

-	* OK, all the checks pass so far; make sure requesting-user-name is

-	* not "root" from a remote host...

+	* OK, all the checks pass so far; validate "requesting-user-name"

+	* attribute value...

 	*/

-        if ((username = ippFindAttribute(con->request, "requesting-user-name",

-	                                 IPP_TAG_NAME)) != NULL)

-	{

-	 /*

-	  * Check for root user...

-	  */

-

-	  if (!strcmp(username->values[0].string.text, "root") &&

-	      _cups_strcasecmp(con->http->hostname, "localhost") &&

-	      strcmp(con->username, "root"))

+        if ((username = ippFindAttribute(con->request, "requesting-user-name", IPP_TAG_ZERO)) != NULL)

+        {

+         /*

+          * Validate "requesting-user-name"...

+          */

+

+          if (username->group_tag != IPP_TAG_OPERATION && StrictConformance)

+          {

+	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute in wrong group.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);

+	    send_ipp_status(con, IPP_STATUS_ERROR_BAD_REQUEST, _("\"requesting-user-name\" attribute in wrong group."));

+	    valid = 0;

+          }

+          else if (username->value_tag != IPP_TAG_NAME && username->value_tag != IPP_TAG_NAMELANG)

+          {

+	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute with wrong syntax.", IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, con->http->hostname);

+	    send_ipp_status(con, IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, _("\"requesting-user-name\" attribute with wrong syntax."));

+	    if ((attr = ippCopyAttribute(con->response, username, 0)) != NULL)

+	      attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;

+	    valid = 0;

+          }

+          else if (!ippValidateAttribute(username))

+          {

+	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute with bad value.", IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, con->http->hostname);

+

+            if (StrictConformance)

+            {

+             /*

+              * Throw an error...

+              */

+

+	      send_ipp_status(con, IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, _("\"requesting-user-name\" attribute with wrong syntax."));

+              if ((attr = ippCopyAttribute(con->response, username, 0)) != NULL)

+                attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;

+	      valid = 0;

+	    }

+	    else

+	    {

+	     /*

+	      * Map bad "requesting-user-name" to 'anonymous'...

+	      */

+

+              ippSetString(con->request, &username, 0, "anonymous");

+	    }

+          }

+          else if (!strcmp(username->values[0].string.text, "root") && _cups_strcasecmp(con->http->hostname, "localhost") && strcmp(con->username, "root"))

 	  {

 	   /*

 	    * Remote unauthenticated user masquerading as local root...

@@ -431,6 +467,8 @@ cupsdProcessIPPRequest(

 	else

 	  sub_id = 0;

+        if (valid)

+        {

        /*

         * Then try processing the operation...

 	*/

@@ -634,6 +672,7 @@ cupsdProcessIPPRequest(

 			      ippOpString(

 			          con->request->request.op.operation_id));

 	      break;

+        }

 	}

       }

     }

@@ -1594,27 +1633,34 @@ add_job(cupsd_client_t  *con,		/* I - Cl

                     _("Bad job-name value: Wrong type or count."));

     if ((attr = ippCopyAttribute(con->response, attr, 0)) != NULL)

       attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;

-    return (NULL);

+

+    if (StrictConformance)

+      return (NULL);

+

+    /* Don't use invalid attribute */

+    ippDeleteAttribute(con->request, attr);

+

+    ippAddString(con->request, IPP_TAG_JOB, IPP_TAG_NAME, "job-name", NULL, "Untitled");

   }

   else if (!ippValidateAttribute(attr))

   {

     send_ipp_status(con, IPP_ATTRIBUTES, _("Bad job-name value: %s"),

                     cupsLastErrorString());

+

     if ((attr = ippCopyAttribute(con->response, attr, 0)) != NULL)

       attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;

-    return (NULL);

-  }

-  attr = ippFindAttribute(con->request, "requesting-user-name", IPP_TAG_NAME);

+    if (StrictConformance)

+      return (NULL);

-  if (attr && !ippValidateAttribute(attr))

-  {

-    send_ipp_status(con, IPP_ATTRIBUTES, _("Bad requesting-user-name value: %s"), cupsLastErrorString());

-    if ((attr = ippCopyAttribute(con->response, attr, 0)) != NULL)

-      attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;

-    return (NULL);

+    /* Don't use invalid attribute */

+    ippDeleteAttribute(con->request, attr);

+

+    ippAddString(con->request, IPP_TAG_JOB, IPP_TAG_NAME, "job-name", NULL, "Untitled");

   }

+  attr = ippFindAttribute(con->request, "requesting-user-name", IPP_TAG_NAME);

+

 #ifdef WITH_LSPP

   if (is_lspp_config())

   {