/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*
* Copyright 2003 Ximian, Inc. (www.ximian.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_KRB5
#include <string.h>
#include <gssapi/gssapi.h>
#include "camel-sasl-gssapi.h"
CamelServiceAuthType camel_sasl_gssapi_authtype = {
N_("GSSAPI"),
N_("This option will connect to the server using "
"Kerberos 5 authentication."),
"GSSAPI",
FALSE
};
static CamelSaslClass *parent_class = NULL;
enum {
GSSAPI_STATE_INIT,
GSSAPI_STATE_CONTINUE_NEEDED,
GSSAPI_STATE_COMPLETE,
GSSAPI_STATE_AUTHENTICATED
};
#define GSSAPI_SECURITY_LAYER_NONE (1 << 0)
#define GSSAPI_SECURITY_LAYER_INTEGRITY (1 << 1)
#define GSSAPI_SECURITY_LAYER_PRIVACY (1 << 2)
#define DESIRED_SECURITY_LAYER GSSAPI_SECURITY_LAYER_NONE
struct _CamelSaslGssapiPrivate {
int state;
gss_ctx_id_t ctx;
gss_name_t target;
};
static void
camel_sasl_gssapi_class_init (CamelSaslGssapiClass *klass)
{
CamelSaslClass *camel_sasl_class = CAMEL_SASL_CLASS (klass);
parent_class = CAMEL_SASL_CLASS (camel_type_get_global_classfuncs (camel_sasl_get_type ()));
/* virtual method overload */
camel_sasl_class->challenge = gssapi_challenge;
}
static void
camel_sasl_gssapi_init (gpointer object, gpointer klass)
{
CamelSaslGssapi *gssapi = CAMEL_SASL_GSSAPI (object);
gssapi->priv = g_new (struct _CamelSaslGssapiPrivate, 1);
gssapi->priv->state = GSSAPI_STATE_INIT;
gssapi->priv->ctx = GSS_C_NO_CONTEXT;
gssapi->priv->target = GSS_C_NO_NAME;
}
static void
camel_sasl_gssapi_finalize (CamelObject *object)
{
CamelSaslGssapi *sasl = CAMEL_SASL_GSSAPI (object);
guint32 status;
if (sasl->priv) {
gss_delete_sec_context (&status, sasl->priv->ctx);
gss_release_name (&status, sasl->priv->target);
g_free (sasl->priv);
}
}
CamelType
camel_sasl_gssapi_get_type (void)
{
static CamelType type = CAMEL_INVALID_TYPE;
if (type == CAMEL_INVALID_TYPE) {
type = camel_type_register (
camel_sasl_get_type (),
"CamelSaslGssapi",
sizeof (CamelSaslGssapi),
sizeof (CamelSaslGssapiClass),
(CamelObjectClassInitFunc) camel_sasl_gssapi_class_init,
NULL,
(CamelObjectInitFunc) camel_sasl_gssapi_init,
(CamelObjectFinalizeFunc) camel_sasl_gssapi_finalize);
}
return type;
}
static void
gssapi_set_exception (OM_uint32 major, OM_uint32 minor, CamelException *ex)
{
const char *str;
switch (major) {
case GSS_S_BAD_MECH:
str = _("The specified mechanism is not supported by the "
"provided credential, or is unrecognized by the "
"implementation.");
break;
case GSS_S_BAD_NAME:
str = _("The provided target_name parameter was ill-formed.");
break;
case GSS_S_BAD_NAMETYPE:
str = _("The provided target_name parameter contained an "
"invalid or unsupported type of name.");
break;
case GSS_S_BAD_BINDINGS:
str = _("The input_token contains different channel "
"bindings to those specified via the "
"input_chan_bindings parameter.");
break;
case GSS_S_BAD_SIG:
str = _("The input_token contains an invalid signature, or a "
"signature that could not be verified.");
break;
case GSS_S_NO_CRED:
str = _("The supplied credentials were not valid for context "
"initiation, or the credential handle did not "
"reference any credentials.");
break;
case GSS_S_NO_CONTEXT:
str = _("Indicates that the supplied context handle did not "
"refer to a valid context.");
break;
case GSS_S_DEFECTIVE_TOKEN:
str = _("Indicates that consistency checks performed on "
"the input_token failed.");
break;
case GSS_S_DEFECTIVE_CREDENTIAL:
str = _("The consistency checks performed on the credential failed.");
break;
case GSS_S_CREDENTIALS_EXPIRED:
str = _("The referenced credentials have expired.");
break;
case GSS_S_FAILURE:
switch (minor) {
}
break;
default:
str = _("Bad authentication response from server.");
}
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE, str);
}
static GByteArray *
gssapi_challenge (CamelSasl *sasl, GByteArray *token, CamelException *ex)
{
struct _CamelSaslGssapiPrivate *priv = CAMEL_SASL_GSSAPI (sasl)->priv;
OM_uint32 major, minor, flags, time;
gss_buffer_desc inbuf, outbuf;
GByteArray *challenge = NULL;
gss_buffer_t input_token;
struct hostent *h;
int conf_state;
gss_qop_t qop;
gss_OID mech;
char *str;
switch (priv->state) {
case GSSAPI_STATE_INIT:
if (!(h = camel_service_gethost (sasl->service, ex)))
goto lose;
str = g_strdup_printf ("%s@%s", sasl->service_name, h->h_name);
camel_free_host (h);
inbuf.value = str;
inbuf.length = strlen (str);
major = gss_import_name (&minor, &inbuf, gss_nt_service_name, &priv->target);
g_free (str);
if (major != GSS_S_COMPLETE) {
gssapi_set_exception (major, minor, ex);
return NULL;
}
input_token = GSS_C_NO_BUFFER;
goto challenge;
break;
case GSSAPI_STATE_CONTINUE_NEEDED:
if (token == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Bad authentication response from server."));
return NULL;
}
inbuf.value = token->data;
inbuf.length = token->len;
input_token = &inbuf;
challenge:
major = gss_init_sec_context (&minor, GSS_C_NO_CREDENTIAL, &priv->ctx, priv->target,
GSS_C_OID_KRBV5_DES, 0, 0, GSS_C_NO_CHANNEL_BINDINGS,
input_token, &mech, &outbuf, &flags, &time);
switch (major) {
case GSS_S_COMPLETE:
priv->state = GSSAPI_STATE_COMPLETE;
break;
case GSS_S_CONTINUE_NEEDED:
priv->state = GSSAPI_STATE_CONTINUE_NEEDED;
break;
default:
gssapi_set_exception (major, minor, ex);
gss_release_buffer (&minor, &outbuf);
return NULL;
}
challenge = g_byte_array_new ()
g_byte_array_append (challenge, outbuf.value, outbuf.length);
gss_release_buffer (&minor, &outbuf);
break;
case GSSAPI_STATE_COMPLETE:
if (token == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Bad authentication response from server."));
return NULL;
}
inbuf.value = token->data;
inbuf.length = token->len;
major = gss_unwrap (&minor, priv->ctx, &inbuf, &outbuf, &conf_state, &qop);
if (major != GSS_S_COMPLETE) {
gssapi_set_exception (major, minor, ex);
gss_release_buffer (&minor, &outbuf);
return NULL;
}
if (outbuf.length < 4) {
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Bad authentication response from server."));
gss_release_buffer (&minor, &outbuf);
return NULL;
}
/* check that our desired security layer is supported */
if (((unsigned char *) outbuf->value)[0] & DESIRED_SECURITY_LAYER) {
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Unsupported security layer."));
gss_release_buffer (&minor, &outbuf);
return NULL;
}
inbuf.length = 4 + strlen (sasl->service->url->user);
inbuf.value = str = g_malloc (inbuf.length);
memcpy (inbuf.value, outbuf.value, 4);
str[0] = DESIRED_SECURITY_LAYER;
memcpy (str + 4, sasl->service->url->user, inbuf.length - 4);
gss_release_buffer (&minor, &outbuf);
major = gss_wrap (&minor, priv->ctx, FALSE, qop, &inbuf, &conf_state, &outbuf);
if (major != 0) {
gssapi_set_exception (major, minor, ex);
gss_release_buffer (&minor, &outbuf);
g_free (str);
return NULL;
}
challenge = g_byte_array_new ();
g_byte_array_append (challenge, outbuf.value, outbuf.length);
gss_release_buffer (&minor, &outbuf);
priv->state = GSSAPI_STATE_AUTHENTICATED;
sasl->authenticated = TRUE;
break;
default:
return NULL;
}
return challenge;
}
#endif /* HAVE_KRB5 */
