26a69856f6
Add a new private interface (accessed through _gss_mg_import_rfc4121_context()) through which a skeletal krb5 mechanism context can be created, suitable for RFC4121 message protection and PRF services.
362 lines
9.0 KiB
C
362 lines
9.0 KiB
C
/*
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* Copyright (c) 2004, PADL Software Pty Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of PADL Software nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* glue routine for _gsskrb5_inquire_sec_context_by_oid
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*/
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#include "gsskrb5_locl.h"
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static OM_uint32
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get_bool(OM_uint32 *minor_status,
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const gss_buffer_t value,
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int *flag)
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{
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if (value->value == NULL || value->length != 1) {
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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*flag = *((const char *)value->value) != 0;
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return GSS_S_COMPLETE;
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}
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static OM_uint32
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get_string(OM_uint32 *minor_status,
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const gss_buffer_t value,
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char **str)
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{
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if (value == NULL || value->length == 0) {
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*str = NULL;
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} else {
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*str = malloc(value->length + 1);
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if (*str == NULL) {
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*minor_status = 0;
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return GSS_S_UNAVAILABLE;
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}
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memcpy(*str, value->value, value->length);
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(*str)[value->length] = '\0';
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}
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return GSS_S_COMPLETE;
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}
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static OM_uint32
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get_int32(OM_uint32 *minor_status,
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const gss_buffer_t value,
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OM_uint32 *ret)
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{
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*minor_status = 0;
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if (value == NULL || value->length == 0)
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*ret = 0;
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else if (value->length == sizeof(*ret))
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memcpy(ret, value->value, sizeof(*ret));
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else
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return GSS_S_UNAVAILABLE;
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return GSS_S_COMPLETE;
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}
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static OM_uint32
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set_int32(OM_uint32 *minor_status,
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const gss_buffer_t value,
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OM_uint32 set)
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{
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*minor_status = 0;
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if (value->length == sizeof(set))
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memcpy(value->value, &set, sizeof(set));
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else
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return GSS_S_UNAVAILABLE;
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return GSS_S_COMPLETE;
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}
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/*
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* GSS_KRB5_IMPORT_RFC4121_CONTEXT_X is an internal, private interface
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* to allow SAnon to create a skeletal context for using RFC4121 message
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* protection services.
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*
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* rfc4121_args ::= initiator_flag || flags || enctype || session key
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*/
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static OM_uint32
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make_rfc4121_context(OM_uint32 *minor,
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krb5_context context,
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gss_ctx_id_t *context_handle,
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gss_const_buffer_t rfc4121_args)
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{
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OM_uint32 major = GSS_S_FAILURE, tmp;
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krb5_error_code ret;
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krb5_storage *sp = NULL;
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gsskrb5_ctx ctx = NULL;
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uint8_t initiator_flag;
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int32_t enctype;
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size_t keysize;
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krb5_keyblock *key;
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*minor = 0;
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sp = krb5_storage_from_readonly_mem(rfc4121_args->value, rfc4121_args->length);
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if (sp == NULL) {
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ret = ENOMEM;
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goto out;
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}
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krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_HOST);
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ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL) {
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ret = ENOMEM;
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goto out;
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}
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ret = krb5_ret_uint8(sp, &initiator_flag);
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if (ret != 0)
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goto out;
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ret = krb5_ret_uint32(sp, &ctx->flags);
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if (ret != 0)
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goto out;
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ctx->more_flags = IS_CFX | ACCEPTOR_SUBKEY | OPEN;
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if (initiator_flag)
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ctx->more_flags |= LOCAL;
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ctx->state = initiator_flag ? INITIATOR_READY : ACCEPTOR_READY;
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ret = krb5_ret_int32(sp, &enctype);
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if (ret != 0)
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goto out;
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ret = krb5_enctype_keysize(context, enctype, &keysize);
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if (ret != 0)
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goto out;
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ctx->auth_context = calloc(1, sizeof(*ctx->auth_context));
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if (ctx->auth_context == NULL) {
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ret = ENOMEM;
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goto out;
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}
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key = calloc(1, sizeof(*key));
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if (key == NULL) {
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ret = ENOMEM;
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goto out;
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}
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if (initiator_flag)
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ctx->auth_context->remote_subkey = key;
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else
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ctx->auth_context->local_subkey = key;
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key->keytype = enctype;
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key->keyvalue.data = malloc(keysize);
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if (key->keyvalue.data == NULL) {
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ret = ENOMEM;
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goto out;
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}
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if (krb5_storage_read(sp, key->keyvalue.data, keysize) != keysize) {
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ret = EINVAL;
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goto out;
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}
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key->keyvalue.length = keysize;
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ret = krb5_crypto_init(context, key, 0, &ctx->crypto);
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if (ret != 0)
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goto out;
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major = _gssapi_msg_order_create(minor, &ctx->order,
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_gssapi_msg_order_f(ctx->flags),
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0, 0, 1);
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if (major != GSS_S_COMPLETE)
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goto out;
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out:
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krb5_storage_free(sp);
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if (major != GSS_S_COMPLETE) {
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if (*minor == 0)
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*minor = ret;
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_gsskrb5_delete_sec_context(&tmp, (gss_ctx_id_t *)&ctx, GSS_C_NO_BUFFER);
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} else {
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*context_handle = (gss_ctx_id_t)ctx;
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}
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return major;
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}
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OM_uint32 GSSAPI_CALLCONV
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_gsskrb5_set_sec_context_option
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(OM_uint32 *minor_status,
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gss_ctx_id_t *context_handle,
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const gss_OID desired_object,
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const gss_buffer_t value)
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{
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krb5_context context;
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OM_uint32 maj_stat;
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GSSAPI_KRB5_INIT (&context);
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if (value == GSS_C_NO_BUFFER) {
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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if (gss_oid_equal(desired_object, GSS_KRB5_COMPAT_DES3_MIC_X)) {
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gsskrb5_ctx ctx;
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int flag;
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if (*context_handle == GSS_C_NO_CONTEXT) {
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*minor_status = EINVAL;
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return GSS_S_NO_CONTEXT;
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}
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maj_stat = get_bool(minor_status, value, &flag);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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ctx = (gsskrb5_ctx)*context_handle;
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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if (flag)
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ctx->more_flags |= COMPAT_OLD_DES3;
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else
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ctx->more_flags &= ~COMPAT_OLD_DES3;
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ctx->more_flags |= COMPAT_OLD_DES3_SELECTED;
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_SET_DNS_CANONICALIZE_X)) {
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int flag;
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maj_stat = get_bool(minor_status, value, &flag);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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krb5_set_dns_canonicalize_hostname(context, flag);
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X)) {
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char *str;
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maj_stat = get_string(minor_status, value, &str);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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maj_stat = _gsskrb5_register_acceptor_identity(minor_status, str);
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free(str);
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return maj_stat;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_SET_DEFAULT_REALM_X)) {
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char *str;
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maj_stat = get_string(minor_status, value, &str);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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if (str == NULL) {
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*minor_status = 0;
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return GSS_S_CALL_INACCESSIBLE_READ;
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}
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krb5_set_default_realm(context, str);
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free(str);
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*minor_status = 0;
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_SEND_TO_KDC_X)) {
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_CCACHE_NAME_X)) {
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char *str;
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maj_stat = get_string(minor_status, value, &str);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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if (str == NULL) {
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*minor_status = 0;
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return GSS_S_CALL_INACCESSIBLE_READ;
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}
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*minor_status = krb5_cc_set_default_name(context, str);
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free(str);
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if (*minor_status)
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return GSS_S_FAILURE;
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_SET_TIME_OFFSET_X)) {
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OM_uint32 offset;
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time_t t;
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maj_stat = get_int32(minor_status, value, &offset);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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t = time(NULL) + offset;
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krb5_set_real_time(context, t, 0);
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*minor_status = 0;
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_TIME_OFFSET_X)) {
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krb5_timestamp sec;
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int32_t usec;
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time_t t;
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t = time(NULL);
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krb5_us_timeofday (context, &sec, &usec);
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maj_stat = set_int32(minor_status, value, sec - t);
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if (maj_stat != GSS_S_COMPLETE)
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return maj_stat;
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*minor_status = 0;
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_PLUGIN_REGISTER_X)) {
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struct gsskrb5_krb5_plugin c;
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if (value->length != sizeof(c)) {
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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memcpy(&c, value->value, sizeof(c));
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krb5_plugin_register(context, c.type, c.name, c.symbol);
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*minor_status = 0;
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return GSS_S_COMPLETE;
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} else if (gss_oid_equal(desired_object, GSS_KRB5_IMPORT_RFC4121_CONTEXT_X)) {
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return make_rfc4121_context(minor_status, context, context_handle, value);
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}
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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