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|
/*
* GSSAPI Security Extensions
* RPC Pipe client and server routines
* Copyright (C) Simo Sorce 2010.
* Copyright (C) Andrew Bartlett 2004-2011.
* Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* We support only GSSAPI/KRB5 here */
#include "includes.h"
#include "gse.h"
#include "libads/kerberos_proto.h"
#include "auth/common_auth.h"
#include "auth/gensec/gensec.h"
#include "auth/credentials/credentials.h"
#include "../librpc/gen_ndr/dcerpc.h"
#if defined(HAVE_KRB5) && defined(HAVE_GSS_WRAP_IOV)
#include "smb_krb5.h"
#include "gse_krb5.h"
#ifndef GSS_C_DCE_STYLE
#define GSS_C_DCE_STYLE 0x1000
#endif
#ifndef GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
#define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH 11
#define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x05"
#endif
gss_OID_desc gse_sesskey_inq_oid = {
GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH,
(void *)GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
};
#ifndef GSS_KRB5_SESSION_KEY_ENCTYPE_OID
#define GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH 10
#define GSS_KRB5_SESSION_KEY_ENCTYPE_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04"
#endif
gss_OID_desc gse_sesskeytype_oid = {
GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH,
(void *)GSS_KRB5_SESSION_KEY_ENCTYPE_OID
};
#define GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID_LENGTH 12
/* EXTRACTION OID AUTHZ ID */
#define GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x0a" "\x01"
gss_OID_desc gse_authz_data_oid = {
GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID_LENGTH,
(void *)GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID
};
static char *gse_errstr(TALLOC_CTX *mem_ctx, OM_uint32 maj, OM_uint32 min);
struct gse_context {
krb5_context k5ctx;
krb5_ccache ccache;
krb5_keytab keytab;
gss_ctx_id_t gss_ctx;
gss_OID_desc gss_mech;
OM_uint32 gss_c_flags;
gss_cred_id_t creds;
gss_name_t server_name;
gss_OID ret_mech;
OM_uint32 ret_flags;
gss_cred_id_t delegated_cred_handle;
gss_name_t client_name;
bool more_processing;
bool authenticated;
};
#ifndef HAVE_GSS_OID_EQUAL
static bool gss_oid_equal(const gss_OID o1, const gss_OID o2)
{
if (o1 == o2) {
return true;
}
if ((o1 == NULL && o2 != NULL) || (o1 != NULL && o2 == NULL)) {
return false;
}
if (o1->length != o2->length) {
return false;
}
return memcmp(o1->elements, o2->elements, o1->length) == false;
}
#endif
/* free non talloc dependent contexts */
static int gse_context_destructor(void *ptr)
{
struct gse_context *gse_ctx;
OM_uint32 gss_min, gss_maj;
gse_ctx = talloc_get_type_abort(ptr, struct gse_context);
if (gse_ctx->k5ctx) {
if (gse_ctx->ccache) {
krb5_cc_close(gse_ctx->k5ctx, gse_ctx->ccache);
gse_ctx->ccache = NULL;
}
if (gse_ctx->keytab) {
krb5_kt_close(gse_ctx->k5ctx, gse_ctx->keytab);
gse_ctx->keytab = NULL;
}
krb5_free_context(gse_ctx->k5ctx);
gse_ctx->k5ctx = NULL;
}
if (gse_ctx->gss_ctx != GSS_C_NO_CONTEXT) {
gss_maj = gss_delete_sec_context(&gss_min,
&gse_ctx->gss_ctx,
GSS_C_NO_BUFFER);
}
if (gse_ctx->server_name) {
gss_maj = gss_release_name(&gss_min,
&gse_ctx->server_name);
}
if (gse_ctx->client_name) {
gss_maj = gss_release_name(&gss_min,
&gse_ctx->client_name);
}
if (gse_ctx->creds) {
gss_maj = gss_release_cred(&gss_min,
&gse_ctx->creds);
}
if (gse_ctx->delegated_cred_handle) {
gss_maj = gss_release_cred(&gss_min,
&gse_ctx->delegated_cred_handle);
}
/* MIT and Heimdal differ as to if you can call
* gss_release_oid() on this OID, generated by
* gss_{accept,init}_sec_context(). However, as long as the
* oid is gss_mech_krb5 (which it always is at the moment),
* then this is a moot point, as both declare this particular
* OID static, and so no memory is lost. This assert is in
* place to ensure that the programmer who wishes to extend
* this code to EAP or other GSS mechanisms determines an
* implementation-dependent way of releasing any dynamically
* allocated OID */
SMB_ASSERT(gss_oid_equal(&gse_ctx->gss_mech, GSS_C_NO_OID) || gss_oid_equal(&gse_ctx->gss_mech, gss_mech_krb5));
return 0;
}
static NTSTATUS gse_context_init(TALLOC_CTX *mem_ctx,
bool do_sign, bool do_seal,
const char *ccache_name,
uint32_t add_gss_c_flags,
struct gse_context **_gse_ctx)
{
struct gse_context *gse_ctx;
krb5_error_code k5ret;
NTSTATUS status;
gse_ctx = talloc_zero(mem_ctx, struct gse_context);
if (!gse_ctx) {
return NT_STATUS_NO_MEMORY;
}
talloc_set_destructor((TALLOC_CTX *)gse_ctx, gse_context_destructor);
memcpy(&gse_ctx->gss_mech, gss_mech_krb5, sizeof(gss_OID_desc));
gse_ctx->gss_c_flags = GSS_C_MUTUAL_FLAG |
GSS_C_DELEG_FLAG |
GSS_C_DELEG_POLICY_FLAG |
GSS_C_REPLAY_FLAG |
GSS_C_SEQUENCE_FLAG;
if (do_sign) {
gse_ctx->gss_c_flags |= GSS_C_INTEG_FLAG;
}
if (do_seal) {
gse_ctx->gss_c_flags |= GSS_C_CONF_FLAG;
}
gse_ctx->gss_c_flags |= add_gss_c_flags;
/* Initialize Kerberos Context */
initialize_krb5_error_table();
k5ret = krb5_init_context(&gse_ctx->k5ctx);
if (k5ret) {
DEBUG(0, ("Failed to initialize kerberos context! (%s)\n",
error_message(k5ret)));
status = NT_STATUS_INTERNAL_ERROR;
goto err_out;
}
if (!ccache_name) {
ccache_name = krb5_cc_default_name(gse_ctx->k5ctx);
}
k5ret = krb5_cc_resolve(gse_ctx->k5ctx, ccache_name,
&gse_ctx->ccache);
if (k5ret) {
DEBUG(1, ("Failed to resolve credential cache! (%s)\n",
error_message(k5ret)));
status = NT_STATUS_INTERNAL_ERROR;
goto err_out;
}
/* TODO: Should we enforce a enc_types list ?
ret = krb5_set_default_tgs_ktypes(gse_ctx->k5ctx, enc_types);
*/
*_gse_ctx = gse_ctx;
return NT_STATUS_OK;
err_out:
TALLOC_FREE(gse_ctx);
return status;
}
static NTSTATUS gse_init_client(TALLOC_CTX *mem_ctx,
bool do_sign, bool do_seal,
const char *ccache_name,
const char *server,
const char *service,
const char *username,
const char *password,
uint32_t add_gss_c_flags,
struct gse_context **_gse_ctx)
{
struct gse_context *gse_ctx;
OM_uint32 gss_maj, gss_min;
gss_buffer_desc name_buffer = {0, NULL};
gss_OID_set_desc mech_set;
NTSTATUS status;
if (!server || !service) {
return NT_STATUS_INVALID_PARAMETER;
}
status = gse_context_init(mem_ctx, do_sign, do_seal,
ccache_name, add_gss_c_flags,
&gse_ctx);
if (!NT_STATUS_IS_OK(status)) {
return NT_STATUS_NO_MEMORY;
}
/* Guess the realm based on the supplied service, and avoid the GSS libs
doing DNS lookups which may fail.
TODO: Loop with the KDC on some more combinations (local
realm in particular), possibly falling back to
GSS_C_NT_HOSTBASED_SERVICE
*/
name_buffer.value = kerberos_get_principal_from_service_hostname(gse_ctx,
service, server);
if (!name_buffer.value) {
status = NT_STATUS_NO_MEMORY;
goto err_out;
}
name_buffer.length = strlen((char *)name_buffer.value);
gss_maj = gss_import_name(&gss_min, &name_buffer,
GSS_C_NT_USER_NAME,
&gse_ctx->server_name);
if (gss_maj) {
DEBUG(0, ("gss_import_name failed for %s, with [%s]\n",
(char *)name_buffer.value,
gse_errstr(gse_ctx, gss_maj, gss_min)));
status = NT_STATUS_INTERNAL_ERROR;
goto err_out;
}
/* TODO: get krb5 ticket using username/password, if no valid
* one already available in ccache */
mech_set.count = 1;
mech_set.elements = &gse_ctx->gss_mech;
gss_maj = gss_acquire_cred(&gss_min,
GSS_C_NO_NAME,
GSS_C_INDEFINITE,
&mech_set,
GSS_C_INITIATE,
&gse_ctx->creds,
NULL, NULL);
if (gss_maj) {
DEBUG(0, ("gss_acquire_creds failed for %s, with [%s]\n",
(char *)name_buffer.value,
gse_errstr(gse_ctx, gss_maj, gss_min)));
status = NT_STATUS_INTERNAL_ERROR;
goto err_out;
}
*_gse_ctx = gse_ctx;
TALLOC_FREE(name_buffer.value);
return NT_STATUS_OK;
err_out:
TALLOC_FREE(name_buffer.value);
TALLOC_FREE(gse_ctx);
return status;
}
static NTSTATUS gse_get_client_auth_token(TALLOC_CTX *mem_ctx,
struct gse_context *gse_ctx,
const DATA_BLOB *token_in,
DATA_BLOB *token_out)
{
OM_uint32 gss_maj, gss_min;
gss_buffer_desc in_data;
gss_buffer_desc out_data;
DATA_BLOB blob = data_blob_null;
NTSTATUS status;
in_data.value = token_in->data;
in_data.length = token_in->length;
gss_maj = gss_init_sec_context(&gss_min,
gse_ctx->creds,
&gse_ctx->gss_ctx,
gse_ctx->server_name,
&gse_ctx->gss_mech,
gse_ctx->gss_c_flags,
0, GSS_C_NO_CHANNEL_BINDINGS,
&in_data, NULL, &out_data,
&gse_ctx->ret_flags, NULL);
switch (gss_maj) {
case GSS_S_COMPLETE:
/* we are done with it */
gse_ctx->more_processing = false;
status = NT_STATUS_OK;
break;
case GSS_S_CONTINUE_NEEDED:
/* we will need a third leg */
gse_ctx->more_processing = true;
/* status = NT_STATUS_MORE_PROCESSING_REQUIRED; */
status = NT_STATUS_OK;
break;
default:
DEBUG(0, ("gss_init_sec_context failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
blob = data_blob_talloc(mem_ctx, out_data.value, out_data.length);
if (!blob.data) {
status = NT_STATUS_NO_MEMORY;
}
gss_maj = gss_release_buffer(&gss_min, &out_data);
done:
*token_out = blob;
return status;
}
static NTSTATUS gse_init_server(TALLOC_CTX *mem_ctx,
bool do_sign, bool do_seal,
uint32_t add_gss_c_flags,
struct gse_context **_gse_ctx)
{
struct gse_context *gse_ctx;
OM_uint32 gss_maj, gss_min;
krb5_error_code ret;
NTSTATUS status;
status = gse_context_init(mem_ctx, do_sign, do_seal,
NULL, add_gss_c_flags, &gse_ctx);
if (!NT_STATUS_IS_OK(status)) {
return NT_STATUS_NO_MEMORY;
}
ret = gse_krb5_get_server_keytab(gse_ctx->k5ctx,
&gse_ctx->keytab);
if (ret) {
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
#ifdef HAVE_GSS_KRB5_IMPORT_CRED
/* This creates a GSSAPI cred_id_t with the keytab set */
gss_maj = gss_krb5_import_cred(&gss_min, NULL, NULL, gse_ctx->keytab,
&gse_ctx->creds);
if (gss_maj != 0
&& gss_maj != (GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME)) {
DEBUG(0, ("gss_krb5_import_cred failed with [%s]\n",
gse_errstr(gse_ctx, gss_maj, gss_min)));
status = NT_STATUS_INTERNAL_ERROR;
goto done;
/* This is the error the MIT krb5 1.9 gives when it
* implements the function, but we do not specify the
* principal. However, when we specify the principal
* as host$@REALM the GSS acceptor fails with 'wrong
* principal in request'. Work around the issue by
* falling back to the alternate approach below. */
} else if (gss_maj == (GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME))
#endif
/* FIXME!!!
* This call sets the default keytab for the whole server, not
* just for this context. Need to find a way that does not alter
* the state of the whole server ... */
{
const char *ktname;
gss_OID_set_desc mech_set;
ret = smb_krb5_keytab_name(gse_ctx, gse_ctx->k5ctx,
gse_ctx->keytab, &ktname);
if (ret) {
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
ret = gsskrb5_register_acceptor_identity(ktname);
if (ret) {
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
mech_set.count = 1;
mech_set.elements = &gse_ctx->gss_mech;
gss_maj = gss_acquire_cred(&gss_min,
GSS_C_NO_NAME,
GSS_C_INDEFINITE,
&mech_set,
GSS_C_ACCEPT,
&gse_ctx->creds,
NULL, NULL);
if (gss_maj) {
DEBUG(0, ("gss_acquire_creds failed with [%s]\n",
gse_errstr(gse_ctx, gss_maj, gss_min)));
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
}
status = NT_STATUS_OK;
done:
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(gse_ctx);
}
*_gse_ctx = gse_ctx;
return status;
}
static NTSTATUS gse_get_server_auth_token(TALLOC_CTX *mem_ctx,
struct gse_context *gse_ctx,
const DATA_BLOB *token_in,
DATA_BLOB *token_out)
{
OM_uint32 gss_maj, gss_min;
gss_buffer_desc in_data;
gss_buffer_desc out_data;
DATA_BLOB blob = data_blob_null;
NTSTATUS status;
in_data.value = token_in->data;
in_data.length = token_in->length;
gss_maj = gss_accept_sec_context(&gss_min,
&gse_ctx->gss_ctx,
gse_ctx->creds,
&in_data,
GSS_C_NO_CHANNEL_BINDINGS,
&gse_ctx->client_name,
&gse_ctx->ret_mech,
&out_data,
&gse_ctx->ret_flags, NULL,
&gse_ctx->delegated_cred_handle);
switch (gss_maj) {
case GSS_S_COMPLETE:
/* we are done with it */
gse_ctx->more_processing = false;
gse_ctx->authenticated = true;
status = NT_STATUS_OK;
break;
case GSS_S_CONTINUE_NEEDED:
/* we will need a third leg */
gse_ctx->more_processing = true;
/* status = NT_STATUS_MORE_PROCESSING_REQUIRED; */
status = NT_STATUS_OK;
break;
default:
DEBUG(0, ("gss_init_sec_context failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
if (gse_ctx->gss_ctx) {
gss_delete_sec_context(&gss_min,
&gse_ctx->gss_ctx,
GSS_C_NO_BUFFER);
}
status = NT_STATUS_INTERNAL_ERROR;
goto done;
}
/* we may be told to return nothing */
if (out_data.length) {
blob = data_blob_talloc(mem_ctx, out_data.value, out_data.length);
if (!blob.data) {
status = NT_STATUS_NO_MEMORY;
}
gss_maj = gss_release_buffer(&gss_min, &out_data);
}
done:
*token_out = blob;
return status;
}
static NTSTATUS gse_verify_server_auth_flags(struct gse_context *gse_ctx)
{
if (!gse_ctx->authenticated) {
return NT_STATUS_INVALID_HANDLE;
}
if (memcmp(gse_ctx->ret_mech,
gss_mech_krb5, sizeof(gss_OID_desc)) != 0) {
return NT_STATUS_ACCESS_DENIED;
}
/* GSS_C_MUTUAL_FLAG */
if (gse_ctx->gss_c_flags & GSS_C_MUTUAL_FLAG) {
if (!(gse_ctx->ret_flags & GSS_C_MUTUAL_FLAG)) {
return NT_STATUS_ACCESS_DENIED;
}
}
/* GSS_C_DELEG_FLAG */
/* GSS_C_DELEG_POLICY_FLAG */
/* GSS_C_REPLAY_FLAG */
/* GSS_C_SEQUENCE_FLAG */
/* GSS_C_INTEG_FLAG */
if (gse_ctx->gss_c_flags & GSS_C_INTEG_FLAG) {
if (!(gse_ctx->ret_flags & GSS_C_INTEG_FLAG)) {
return NT_STATUS_ACCESS_DENIED;
}
}
/* GSS_C_CONF_FLAG */
if (gse_ctx->gss_c_flags & GSS_C_CONF_FLAG) {
if (!(gse_ctx->ret_flags & GSS_C_CONF_FLAG)) {
return NT_STATUS_ACCESS_DENIED;
}
}
return NT_STATUS_OK;
}
static char *gse_errstr(TALLOC_CTX *mem_ctx, OM_uint32 maj, OM_uint32 min)
{
OM_uint32 gss_min, gss_maj;
gss_buffer_desc msg_min;
gss_buffer_desc msg_maj;
OM_uint32 msg_ctx = 0;
char *errstr = NULL;
ZERO_STRUCT(msg_min);
ZERO_STRUCT(msg_maj);
gss_maj = gss_display_status(&gss_min, maj, GSS_C_GSS_CODE,
GSS_C_NO_OID, &msg_ctx, &msg_maj);
if (gss_maj) {
goto done;
}
errstr = talloc_strndup(mem_ctx,
(char *)msg_maj.value,
msg_maj.length);
if (!errstr) {
goto done;
}
gss_maj = gss_display_status(&gss_min, min, GSS_C_MECH_CODE,
(gss_OID)discard_const(gss_mech_krb5),
&msg_ctx, &msg_min);
if (gss_maj) {
goto done;
}
errstr = talloc_strdup_append_buffer(errstr, ": ");
if (!errstr) {
goto done;
}
errstr = talloc_strndup_append_buffer(errstr,
(char *)msg_min.value,
msg_min.length);
if (!errstr) {
goto done;
}
done:
if (msg_min.value) {
gss_maj = gss_release_buffer(&gss_min, &msg_min);
}
if (msg_maj.value) {
gss_maj = gss_release_buffer(&gss_min, &msg_maj);
}
return errstr;
}
static DATA_BLOB gse_get_session_key(TALLOC_CTX *mem_ctx,
struct gse_context *gse_ctx)
{
OM_uint32 gss_min, gss_maj;
gss_buffer_set_t set = GSS_C_NO_BUFFER_SET;
DATA_BLOB ret;
gss_maj = gss_inquire_sec_context_by_oid(
&gss_min, gse_ctx->gss_ctx,
&gse_sesskey_inq_oid, &set);
if (gss_maj) {
DEBUG(0, ("gss_inquire_sec_context_by_oid failed [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
return data_blob_null;
}
if ((set == GSS_C_NO_BUFFER_SET) ||
(set->count != 2) ||
(memcmp(set->elements[1].value,
gse_sesskeytype_oid.elements,
gse_sesskeytype_oid.length) != 0)) {
#ifdef HAVE_GSSKRB5_GET_SUBKEY
krb5_keyblock *subkey;
gss_maj = gsskrb5_get_subkey(&gss_min,
gse_ctx->gss_ctx,
&subkey);
if (gss_maj != 0) {
DEBUG(1, ("NO session key for this mech\n"));
return data_blob_null;
}
ret = data_blob_talloc(mem_ctx,
KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
krb5_free_keyblock(NULL /* should be krb5_context */, subkey);
return ret;
#else
DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown "
"OID for data in results:\n"));
dump_data(1, (uint8_t *)set->elements[1].value,
set->elements[1].length);
return data_blob_null;
#endif
}
ret = data_blob_talloc(mem_ctx, set->elements[0].value,
set->elements[0].length);
gss_maj = gss_release_buffer_set(&gss_min, &set);
return ret;
}
static size_t gse_get_signature_length(struct gse_context *gse_ctx,
bool seal, size_t payload_size)
{
OM_uint32 gss_min, gss_maj;
gss_iov_buffer_desc iov[2];
int sealed;
/*
* gss_wrap_iov_length() only needs the type and length
*/
iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
iov[0].buffer.value = NULL;
iov[0].buffer.length = 0;
iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
iov[1].buffer.value = NULL;
iov[1].buffer.length = payload_size;
gss_maj = gss_wrap_iov_length(&gss_min, gse_ctx->gss_ctx,
seal, GSS_C_QOP_DEFAULT,
&sealed, iov, 2);
if (gss_maj) {
DEBUG(0, ("gss_wrap_iov_length failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
return 0;
}
return iov[0].buffer.length;
}
static NTSTATUS gse_seal(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
DATA_BLOB *data, DATA_BLOB *signature)
{
OM_uint32 gss_min, gss_maj;
gss_iov_buffer_desc iov[2];
int req_seal = 1; /* setting to 1 means we request sign+seal */
int sealed = 1;
NTSTATUS status;
/* allocate the memory ourselves so we do not need to talloc_memdup */
signature->length = gse_get_signature_length(gse_ctx, true, data->length);
if (!signature->length) {
return NT_STATUS_INTERNAL_ERROR;
}
signature->data = (uint8_t *)talloc_size(mem_ctx, signature->length);
if (!signature->data) {
return NT_STATUS_NO_MEMORY;
}
iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
iov[0].buffer.value = signature->data;
iov[0].buffer.length = signature->length;
/* data is encrypted in place, which is ok */
iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
iov[1].buffer.value = data->data;
iov[1].buffer.length = data->length;
gss_maj = gss_wrap_iov(&gss_min, gse_ctx->gss_ctx,
req_seal, GSS_C_QOP_DEFAULT,
&sealed, iov, 2);
if (gss_maj) {
DEBUG(0, ("gss_wrap_iov failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
if (!sealed) {
DEBUG(0, ("gss_wrap_iov says data was not sealed!\n"));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
status = NT_STATUS_OK;
DEBUG(10, ("Sealed %d bytes, and got %d bytes header/signature.\n",
(int)iov[1].buffer.length, (int)iov[0].buffer.length));
done:
return status;
}
static NTSTATUS gse_unseal(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
DATA_BLOB *data, const DATA_BLOB *signature)
{
OM_uint32 gss_min, gss_maj;
gss_iov_buffer_desc iov[2];
int sealed;
NTSTATUS status;
iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
iov[0].buffer.value = signature->data;
iov[0].buffer.length = signature->length;
/* data is decrypted in place, which is ok */
iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
iov[1].buffer.value = data->data;
iov[1].buffer.length = data->length;
gss_maj = gss_unwrap_iov(&gss_min, gse_ctx->gss_ctx,
&sealed, NULL, iov, 2);
if (gss_maj) {
DEBUG(0, ("gss_unwrap_iov failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
if (!sealed) {
DEBUG(0, ("gss_unwrap_iov says data is not sealed!\n"));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
status = NT_STATUS_OK;
DEBUG(10, ("Unsealed %d bytes, with %d bytes header/signature.\n",
(int)iov[1].buffer.length, (int)iov[0].buffer.length));
done:
return status;
}
static NTSTATUS gse_sign(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
DATA_BLOB *data, DATA_BLOB *signature)
{
OM_uint32 gss_min, gss_maj;
gss_buffer_desc in_data = { 0, NULL };
gss_buffer_desc out_data = { 0, NULL};
NTSTATUS status;
in_data.value = data->data;
in_data.length = data->length;
gss_maj = gss_get_mic(&gss_min, gse_ctx->gss_ctx,
GSS_C_QOP_DEFAULT,
&in_data, &out_data);
if (gss_maj) {
DEBUG(0, ("gss_get_mic failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
*signature = data_blob_talloc(mem_ctx,
out_data.value, out_data.length);
if (!signature->data) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
status = NT_STATUS_OK;
done:
if (out_data.value) {
gss_maj = gss_release_buffer(&gss_min, &out_data);
}
return status;
}
static NTSTATUS gse_sigcheck(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
const DATA_BLOB *data, const DATA_BLOB *signature)
{
OM_uint32 gss_min, gss_maj;
gss_buffer_desc in_data = { 0, NULL };
gss_buffer_desc in_token = { 0, NULL};
NTSTATUS status;
in_data.value = data->data;
in_data.length = data->length;
in_token.value = signature->data;
in_token.length = signature->length;
gss_maj = gss_verify_mic(&gss_min, gse_ctx->gss_ctx,
&in_data, &in_token, NULL);
if (gss_maj) {
DEBUG(0, ("gss_verify_mic failed with [%s]\n",
gse_errstr(talloc_tos(), gss_maj, gss_min)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
status = NT_STATUS_OK;
done:
return status;
}
static NTSTATUS gensec_gse_client_start(struct gensec_security *gensec_security)
{
struct gse_context *gse_ctx;
struct cli_credentials *creds = gensec_get_credentials(gensec_security);
NTSTATUS nt_status;
OM_uint32 want_flags = 0;
bool do_sign = false, do_seal = false;
const char *hostname = gensec_get_target_hostname(gensec_security);
const char *service = gensec_get_target_service(gensec_security);
const char *username = cli_credentials_get_username(creds);
const char *password = cli_credentials_get_password(creds);
if (!hostname) {
DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_ipaddress(hostname)) {
DEBUG(2, ("Cannot do GSE to an IP address\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (strcmp(hostname, "localhost") == 0) {
DEBUG(2, ("GSE to 'localhost' does not make sense\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
do_sign = true;
}
if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
do_seal = true;
}
if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
want_flags |= GSS_C_DCE_STYLE;
}
nt_status = gse_init_client(gensec_security, do_sign, do_seal, NULL,
hostname, service,
username, password, want_flags,
&gse_ctx);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_security->private_data = gse_ctx;
return NT_STATUS_OK;
}
static NTSTATUS gensec_gse_server_start(struct gensec_security *gensec_security)
{
struct gse_context *gse_ctx;
NTSTATUS nt_status;
OM_uint32 want_flags = 0;
bool do_sign = false, do_seal = false;
if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
do_sign = true;
}
if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
do_seal = true;
}
if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
want_flags |= GSS_C_DCE_STYLE;
}
nt_status = gse_init_server(gensec_security, do_sign, do_seal, want_flags,
&gse_ctx);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_security->private_data = gse_ctx;
return NT_STATUS_OK;
}
/**
* Check if the packet is one for this mechansim
*
* @param gensec_security GENSEC state
* @param in The request, as a DATA_BLOB
* @return Error, INVALID_PARAMETER if it's not a packet for us
* or NT_STATUS_OK if the packet is ok.
*/
static NTSTATUS gensec_gse_magic(struct gensec_security *gensec_security,
const DATA_BLOB *in)
{
if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
return NT_STATUS_OK;
} else {
return NT_STATUS_INVALID_PARAMETER;
}
}
/**
* Next state function for the GSE GENSEC mechanism
*
* @param gensec_gse_state GSE State
* @param mem_ctx The TALLOC_CTX for *out to be allocated on
* @param in The request, as a DATA_BLOB
* @param out The reply, as an talloc()ed DATA_BLOB, on *mem_ctx
* @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
* or NT_STATUS_OK if the user is authenticated.
*/
static NTSTATUS gensec_gse_update(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
const DATA_BLOB in, DATA_BLOB *out)
{
NTSTATUS status;
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
status = gse_get_client_auth_token(mem_ctx, gse_ctx,
&in, out);
break;
case GENSEC_SERVER:
status = gse_get_server_auth_token(mem_ctx, gse_ctx,
&in, out);
break;
}
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (gse_ctx->more_processing) {
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
if (gensec_security->gensec_role == GENSEC_SERVER) {
return gse_verify_server_auth_flags(gse_ctx);
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gse_wrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
input_token.length = in->length;
input_token.value = in->data;
maj_stat = gss_wrap(&min_stat,
gse_ctx->gss_ctx,
gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
GSS_C_QOP_DEFAULT,
&input_token,
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
DEBUG(0, ("gensec_gse_wrap: GSS Wrap failed: %s\n",
gse_errstr(talloc_tos(), maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
*out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
&& !conf_state) {
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gse_unwrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
gss_qop_t qop_state;
input_token.length = in->length;
input_token.value = in->data;
maj_stat = gss_unwrap(&min_stat,
gse_ctx->gss_ctx,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(0, ("gensec_gse_unwrap: GSS UnWrap failed: %s\n",
gse_errstr(talloc_tos(), maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
*out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
&& !conf_state) {
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gse_seal_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
DATA_BLOB *sig)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
DATA_BLOB payload = data_blob_const(data, length);
return gse_seal(mem_ctx, gse_ctx, &payload, sig);
}
static NTSTATUS gensec_gse_unseal_packet(struct gensec_security *gensec_security,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
const DATA_BLOB *sig)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
DATA_BLOB payload = data_blob_const(data, length);
return gse_unseal(talloc_tos() /* unused */, gse_ctx, &payload, sig);
}
static NTSTATUS gensec_gse_sign_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
DATA_BLOB *sig)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
DATA_BLOB payload = data_blob_const(data, length);
return gse_sign(mem_ctx, gse_ctx, &payload, sig);
}
static NTSTATUS gensec_gse_check_packet(struct gensec_security *gensec_security,
const uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
const DATA_BLOB *sig)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
DATA_BLOB payload = data_blob_const(data, length);
return gse_sigcheck(NULL, gse_ctx, &payload, sig);
}
/* Try to figure out what features we actually got on the connection */
static bool gensec_gse_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
if (feature & GENSEC_FEATURE_SIGN) {
return gse_ctx->ret_flags & GSS_C_INTEG_FLAG;
}
if (feature & GENSEC_FEATURE_SEAL) {
return gse_ctx->ret_flags & GSS_C_CONF_FLAG;
}
if (feature & GENSEC_FEATURE_SESSION_KEY) {
/* Only for GSE/Krb5 */
if (gss_oid_equal(gse_ctx->ret_mech, gss_mech_krb5)) {
return true;
}
}
if (feature & GENSEC_FEATURE_DCE_STYLE) {
return gse_ctx->ret_flags & GSS_C_DCE_STYLE;
}
/* We can always do async (rather than strict request/reply) packets. */
if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
return true;
}
return false;
}
/*
* Extract the 'sesssion key' needed by SMB signing and ncacn_np
* (for encrypting some passwords).
*
* This breaks all the abstractions, but what do you expect...
*/
static NTSTATUS gensec_gse_session_key(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
DATA_BLOB *session_key_out)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
DATA_BLOB session_key = gse_get_session_key(mem_ctx, gse_ctx);
if (session_key.data == NULL) {
return NT_STATUS_NO_USER_SESSION_KEY;
}
*session_key_out = session_key;
return NT_STATUS_OK;
}
/* Get some basic (and authorization) information about the user on
* this session. This uses either the PAC (if present) or a local
* database lookup */
static NTSTATUS gensec_gse_session_info(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
struct auth_session_info **_session_info)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
NTSTATUS nt_status;
TALLOC_CTX *tmp_ctx;
struct auth_session_info *session_info = NULL;
OM_uint32 maj_stat, min_stat;
DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
gss_buffer_desc name_token;
char *principal_string;
tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gse_session_info context");
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
maj_stat = gss_display_name(&min_stat,
gse_ctx->client_name,
&name_token,
NULL);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS display_name failed: %s\n",
gse_errstr(talloc_tos(), maj_stat, min_stat)));
talloc_free(tmp_ctx);
return NT_STATUS_FOOBAR;
}
principal_string = talloc_strndup(tmp_ctx,
(const char *)name_token.value,
name_token.length);
gss_release_buffer(&min_stat, &name_token);
if (!principal_string) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
nt_status = gssapi_obtain_pac_blob(tmp_ctx, gse_ctx->gss_ctx,
gse_ctx->client_name,
&pac_blob);
/* IF we have the PAC - otherwise we need to get this
* data from elsewere
*/
if (NT_STATUS_IS_OK(nt_status)) {
pac_blob_ptr = &pac_blob;
}
nt_status = gensec_generate_session_info_pac(tmp_ctx,
gensec_security,
NULL,
pac_blob_ptr, principal_string,
gensec_get_remote_address(gensec_security),
&session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
nt_status = gensec_gse_session_key(gensec_security, session_info,
&session_info->session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
*_session_info = talloc_move(mem_ctx, &session_info);
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
static size_t gensec_gse_sig_size(struct gensec_security *gensec_security,
size_t data_size)
{
struct gse_context *gse_ctx =
talloc_get_type_abort(gensec_security->private_data,
struct gse_context);
return gse_get_signature_length(gse_ctx,
gensec_security->want_features & GENSEC_FEATURE_SEAL,
data_size);
}
static const char *gensec_gse_krb5_oids[] = {
GENSEC_OID_KERBEROS5_OLD,
GENSEC_OID_KERBEROS5,
NULL
};
const struct gensec_security_ops gensec_gse_krb5_security_ops = {
.name = "gse_krb5",
.auth_type = DCERPC_AUTH_TYPE_KRB5,
.oid = gensec_gse_krb5_oids,
.client_start = gensec_gse_client_start,
.server_start = gensec_gse_server_start,
.magic = gensec_gse_magic,
.update = gensec_gse_update,
.session_key = gensec_gse_session_key,
.session_info = gensec_gse_session_info,
.sig_size = gensec_gse_sig_size,
.sign_packet = gensec_gse_sign_packet,
.check_packet = gensec_gse_check_packet,
.seal_packet = gensec_gse_seal_packet,
.unseal_packet = gensec_gse_unseal_packet,
.wrap = gensec_gse_wrap,
.unwrap = gensec_gse_unwrap,
.have_feature = gensec_gse_have_feature,
.enabled = true,
.kerberos = true,
.priority = GENSEC_GSSAPI
};
#endif /* HAVE_KRB5 && HAVE_GSS_WRAP_IOV */
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