- djm@cvs.openbsd.org 2010/01/30 02:54:53

[openssh.git] / gss-genr.c

diff --git a/gss-genr.c b/gss-genr.c
index 8d75ee5c7bb28d3fda6fda89d94cee913034b9d2..842f38582c0c028c680fb129713710dabfe0ac57 100644 (file)
--- a/gss-genr.c
+++ b/gss-genr.c
@@ -1,7 +1,7 @@
-/*     $OpenBSD: gss-genr.c,v 1.7 2006/03/20 04:07:49 djm Exp $        */
+/* $OpenBSD: gss-genr.c,v 1.20 2009/06/22 05:39:28 dtucker Exp $ */
 
 /*
- * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
+ * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -28,8 +28,15 @@
 
 #ifdef GSSAPI
 
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+
 #include "xmalloc.h"
-#include "bufaux.h"
+#include "buffer.h"
 #include "log.h"
 #include "ssh2.h"
 
@@ -100,7 +107,7 @@ ssh_gssapi_last_error(Gssctxt *ctxt, OM_uint32 *major_status,
        /* The GSSAPI error */
        do {
                gss_display_status(&lmin, ctxt->major,
-                   GSS_C_GSS_CODE, GSS_C_NULL_OID, &ctx, &msg);
+                   GSS_C_GSS_CODE, ctxt->oid, &ctx, &msg);
 
                buffer_append(&b, msg.value, msg.length);
                buffer_put_char(&b, '\n');
@@ -111,7 +118,7 @@ ssh_gssapi_last_error(Gssctxt *ctxt, OM_uint32 *major_status,
        /* The mechanism specific error */
        do {
                gss_display_status(&lmin, ctxt->minor,
-                   GSS_C_MECH_CODE, GSS_C_NULL_OID, &ctx, &msg);
+                   GSS_C_MECH_CODE, ctxt->oid, &ctx, &msg);
 
                buffer_append(&b, msg.value, msg.length);
                buffer_put_char(&b, '\n');
@@ -135,9 +142,7 @@ ssh_gssapi_last_error(Gssctxt *ctxt, OM_uint32 *major_status,
 void
 ssh_gssapi_build_ctx(Gssctxt **ctx)
 {
-       *ctx = xmalloc(sizeof (Gssctxt));
-       (*ctx)->major = 0;
-       (*ctx)->minor = 0;
+       *ctx = xcalloc(1, sizeof (Gssctxt));
        (*ctx)->context = GSS_C_NO_CONTEXT;
        (*ctx)->name = GSS_C_NO_NAME;
        (*ctx)->oid = GSS_C_NO_OID;
@@ -207,10 +212,11 @@ OM_uint32
 ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
 {
        gss_buffer_desc gssbuf;
+       char *val;
 
-       gssbuf.length = sizeof("host@") + strlen(host);
-       gssbuf.value = xmalloc(gssbuf.length);
-       snprintf(gssbuf.value, gssbuf.length, "host@%s", host);
+       xasprintf(&val, "host@%s", host);
+       gssbuf.value = val;
+       gssbuf.length = strlen(gssbuf.value);
 
        if ((ctx->major = gss_import_name(&ctx->minor,
            &gssbuf, GSS_C_NT_HOSTBASED_SERVICE, &ctx->name)))
@@ -220,39 +226,6 @@ ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
        return (ctx->major);
 }
 
-/* Acquire credentials for a server running on the current host.
- * Requires that the context structure contains a valid OID
- */
-
-/* Returns a GSSAPI error code */
-OM_uint32
-ssh_gssapi_acquire_cred(Gssctxt *ctx)
-{
-       OM_uint32 status;
-       char lname[MAXHOSTNAMELEN];
-       gss_OID_set oidset;
-
-       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 (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);
-
-       gss_release_oid_set(&status, &oidset);
-       return (ctx->major);
-}
-
 OM_uint32
 ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
 {
@@ -275,14 +248,34 @@ ssh_gssapi_buildmic(Buffer *b, const char *user, const char *service,
        buffer_put_cstring(b, context);
 }
 
-OM_uint32
-ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
+int
+ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
 {
-       if (*ctx)
-               ssh_gssapi_delete_ctx(ctx);
+       gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
+       OM_uint32 major, minor;
+       gss_OID_desc spnego_oid = {6, (void *)"\x2B\x06\x01\x05\x05\x02"};
+
+       /* RFC 4462 says we MUST NOT do SPNEGO */
+       if (oid->length == spnego_oid.length && 
+           (memcmp(oid->elements, spnego_oid.elements, oid->length) == 0))
+               return 0; /* false */
+
        ssh_gssapi_build_ctx(ctx);
        ssh_gssapi_set_oid(*ctx, oid);
-       return (ssh_gssapi_acquire_cred(*ctx));
+       major = ssh_gssapi_import_name(*ctx, host);
+       if (!GSS_ERROR(major)) {
+               major = ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token, 
+                   NULL);
+               gss_release_buffer(&minor, &token);
+               if ((*ctx)->context != GSS_C_NO_CONTEXT)
+                       gss_delete_sec_context(&minor, &(*ctx)->context,
+                           GSS_C_NO_BUFFER);
+       }
+
+       if (GSS_ERROR(major)) 
+               ssh_gssapi_delete_ctx(ctx);
+
+       return (!GSS_ERROR(major));
 }
 
 #endif /* GSSAPI */