[libvirt] [PATCH v3 08/11] driver.c: change URI validation to handle QEMU and vbox case

[Daniel Henrique Barboza]

The existing QEMU and vbox URI path validation consider
that a privileged user can use both a "/system" and a
"/session" URI. This differs from all the other drivers
that forbids the root user to use "/session" URI.

Let's update virConnectValidateURIPath() to handle these
cases as exceptions, using the already existent 'entityName'
value to handle "QEMU" and "vbox" differently. This allows
us to use the validateURI function in these cases without
changing the existing behavior of other drivers.

Suggested-by: Cole Robinson <crobinso at redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413 at gmail.com>
---
 src/driver.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/driver.c b/src/driver.c
index e627b0c1d7..8f9da35f78 100644
--- a/src/driver.c
+++ b/src/driver.c
@@ -276,16 +276,30 @@ virConnectValidateURIPath(const char *uriPath,
                           bool privileged)
 {
     if (privileged) {
-        if (STRNEQ(uriPath, "/system")) {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("unexpected %s URI path '%s', try %s:///system"),
-                           entityName, uriPath, entityName);
-            return false;
+        /* TODO: QEMU and vbox drivers allow '/session'
+         * connections as root. This is not ideal, but changing
+         * these drivers to refuse privileged '/session'
+         * connections, like everyone else is already doing, can
+         * break existing applications. Until we decide what to do,
+         * for now we can handle them as exception in this validate
+         * function.
+         */
+        bool compatSessionRoot = (STREQ(entityName, "QEMU") ||
+                                  STREQ(entityName, "vbox"));
+
+        if ((compatSessionRoot && STRNEQ(uriPath, "/session")) ||
+            STRNEQ(uriPath, "/system")) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("unexpected %s URI path '%s', try "
+                                 "%s:///system"),
+                               entityName, uriPath, entityName);
+                return false;
         }
     } else {
         if (STRNEQ(uriPath, "/session")) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("unexpected %s URI path '%s', try %s:///session"),
+                           _("unexpected %s URI path '%s', try "
+                             "%s:///session"),
                            entityName, uriPath, entityName);
             return false;
         }
-- 
2.21.0