[libsoup/wip/tpopela/negotiate] soup-auth-negotiate: Introduce a blacklist of URIs where the GSSAPI authentication won't happen

[Tomas Popela <tpopela src gnome org>]

commit 13b9711030272dedc0d70ceedce04e8567b94754
Author: Tomas Popela <tpopela redhat com>
Date:   Wed Feb 10 17:07:20 2016 +0100

    soup-auth-negotiate: Introduce a blacklist of URIs where the GSSAPI authentication won't happen
    
    Introduce a blacklist of URIs where the GSSAPI authentication won't happen and
    the user will fallback to provide the credentials. The list will be initialized
    from the SOUP_GSSAPI_BLACKLISTED_URIS environmental variable. As a part of this
    change the SOUP_AUTH_TRUSTED_URIS was renamed to SOUP_GSSAPI_TRUSTED_URIS to
    express that it belongs to the GSSAPI configuration.

 libsoup/soup-auth-negotiate.c |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)
---
diff --git a/libsoup/soup-auth-negotiate.c b/libsoup/soup-auth-negotiate.c
index d0fc3af..3bd297f 100644
--- a/libsoup/soup-auth-negotiate.c
+++ b/libsoup/soup-auth-negotiate.c
@@ -74,8 +74,9 @@ static const char spnego_OID[] = "\x2b\x06\x01\x05\x05\x02";
 static const gss_OID_desc gss_mech_spnego = { sizeof (spnego_OID) - 1, (void *) &spnego_OID };
 
 static GSList *trusted_uris;
+static GSList *blacklisted_uris;
 
-static void parse_trusted_uris (void);
+static void parse_uris_from_env_variable (const gchar *env_variable, GSList **list);
 
 static void check_server_response (SoupMessage *msg, gpointer state);
 static void remove_server_response_handler (SoupMessage *msg, gpointer state);
@@ -261,7 +262,8 @@ soup_auth_negotiate_class_init (SoupAuthNegotiateClass *auth_negotiate_class)
        conn_auth_class->is_connection_ready = soup_auth_negotiate_is_connection_ready;
 
 #ifdef LIBSOUP_HAVE_GSSAPI
-       parse_trusted_uris ();
+       parse_uris_from_env_variable ("SOUP_GSSAPI_TRUSTED_URIS", &trusted_uris);
+       parse_uris_from_env_variable ("SOUP_GSSAPI_BLACKLISTED_URIS", &blacklisted_uris);
 #endif /* LIBSOUP_HAVE_GSSAPI */
 }
 
@@ -323,7 +325,7 @@ match_base_uri (SoupURI *list_uri, SoupURI *msg_uri)
 
 /* Parses a comma separated list of URIS from the environment. */
 static void
-parse_trusted_uris (void)
+parse_uris_from_env_variable (const gchar *env_variable, GSList **list)
 {
        gchar **uris = NULL;
        const gchar *env;
@@ -331,9 +333,9 @@ parse_trusted_uris (void)
        guint length;
 
        /* Initialize the list */
-       trusted_uris = NULL;
+       *list = NULL;
 
-       if (!(env = g_getenv ("SOUP_AUTH_TRUSTED_URIS")))
+       if (!(env = g_getenv (env_variable)))
                return;
 
        if (!(uris = g_strsplit (env, ",", -1)))
@@ -345,7 +347,7 @@ parse_trusted_uris (void)
 
                /* If the supplied URI is valid, append it to the list */
                if ((uri = soup_uri_new (uris[i])))
-                       trusted_uris = g_slist_prepend (trusted_uris, uri);
+                       *list = g_slist_prepend (*list, uri);
        }
 
        g_strfreev (uris);
@@ -362,7 +364,12 @@ check_auth_trusted_uri (SoupAuthNegotiate *negotiate, SoupMessage *msg)
 
        msg_uri = soup_message_get_uri (msg);
 
-       /* If no trusted uris are set, we allow all https uris */
+       /* First check if the URI is not on blacklist */
+       if (blacklisted_uris &&
+           g_slist_find_custom (blacklisted_uris, msg_uri, (GCompareFunc) match_base_uri))
+               return FALSE;
+
+       /* If no trusted URIs are set, we allow all HTTPS URIs */
        if (!trusted_uris)
                return msg_uri->scheme == SOUP_URI_SCHEME_HTTPS;