Backport from Simon Wilkinson's GSSAPI key exchange patch for 5.0p1:

- Add code to actually implement GSSAPIStrictAcceptorCheck, which had
somehow been omitted from a previous version of this patch (closes:
#474246).

1 files changed, 22 insertions, 15 deletions

diff --git a/gss-serv.c b/gss-serv.c
index e157ec515..3908d6378 100644
--- a/gss-serv.c
+++ b/gss-serv.c
@@ -1,7 +1,7 @@
 /* $OpenBSD: gss-serv.c,v 1.21 2007/06/12 08:20:00 djm Exp $ */
 
 /*
- * Copyright (c) 2001-2006 Simon Wilkinson. All rights reserved.
+ * Copyright (c) 2001-2008 Simon Wilkinson. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -84,25 +84,32 @@ ssh_gssapi_acquire_cred(Gssctxt *ctx)
         char lname[MAXHOSTNAMELEN];
         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, MAXHOSTNAMELEN)) {
-                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 */