upstream commit

add knob to relax GSSAPI host credential check for
 multihomed hosts bz#928, patch by Simon Wilkinson; ok dtucker
 (kerberos/GSSAPI is not compiled by default on OpenBSD)

Upstream-ID: 15ddf1c6f7fd9d98eea9962f480079ae3637285d

1 files changed, 25 insertions, 15 deletions

diff --git a/gss-serv.c b/gss-serv.c
index e7b8c5223..53993d674 100644
--- a/gss-serv.c
+++ b/gss-serv.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gss-serv.c,v 1.28 2015/01/20 23:14:00 deraadt Exp $ */
+/* $OpenBSD: gss-serv.c,v 1.29 2015/05/22 03:50:02 djm Exp $ */
 
 /*
  * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
@@ -44,9 +44,12 @@
 #include "channels.h"
 #include "session.h"
 #include "misc.h"
+#include "servconf.h"
 
 #include "ssh-gss.h"
 
+extern ServerOptions options;
+
 static ssh_gssapi_client gssapi_client =
     { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
     GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL, NULL}};
@@ -99,25 +102,32 @@ ssh_gssapi_acquire_cred(Gssctxt *ctx)
         char lname[NI_MAXHOST];
         gss_OID_set oidset;
 
-        gss_create_empty_oid_set(&status, &oidset);
-        gss_add_oid_set_member(&status, ctx->oid, &oidset);
+        if (options.gss_strict_acceptor) {
+                gss_create_empty_oid_set(&status, &oidset);
+                gss_add_oid_set_member(&status, ctx->oid, &oidset);
 
-        if (gethostname(lname, sizeof(lname))) {
-                gss_release_oid_set(&status, &oidset);
-                return (-1);
-        }
+                if (gethostname(lname, MAXHOSTNAMELEN)) {
+                        gss_release_oid_set(&status, &oidset);
+                        return (-1);
+                }
+
+                if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
+                        gss_release_oid_set(&status, &oidset);
+                        return (ctx->major);
+                }
+
+                if ((ctx->major = gss_acquire_cred(&ctx->minor,
+                    ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds,
+                    NULL, NULL)))
+                        ssh_gssapi_error(ctx);
 
-        if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
                 gss_release_oid_set(&status, &oidset);
                 return (ctx->major);
+        } else {
+                ctx->name = GSS_C_NO_NAME;
+                ctx->creds = GSS_C_NO_CREDENTIAL;
         }
-
-        if ((ctx->major = gss_acquire_cred(&ctx->minor,
-            ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
-                ssh_gssapi_error(ctx);
-
-        gss_release_oid_set(&status, &oidset);
-        return (ctx->major);
+        return GSS_S_COMPLETE;
 }
 
 /* Privileged */