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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (c) 2004-2008 Apple Inc. All Rights Reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of Apple Inc. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Apple Inc. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* pkinit_apple_server.c - Server side routines for PKINIT, Mac OS X version
*
* Created 21 May 2004 by Doug Mitchell at Apple.
*/
#if APPLE_PKINIT
#include "pkinit_server.h"
#include "pkinit_asn1.h"
#include "pkinit_cms.h"
#include <assert.h>
#define PKINIT_DEBUG 0
#if PKINIT_DEBUG
#define pkiDebug(args...) printf(args)
#else
#define pkiDebug(args...)
#endif
/*
* Parse PA-PK-AS-REQ message. Optionally evaluates the message's certificate chain.
* Optionally returns various components.
*/
krb5_error_code krb5int_pkinit_as_req_parse(
krb5_context context,
const krb5_data *as_req,
krb5_timestamp *kctime, /* optionally RETURNED */
krb5_ui_4 *cusec, /* microseconds, optionally RETURNED */
krb5_ui_4 *nonce, /* optionally RETURNED */
krb5_checksum *pa_cksum, /* optional, contents mallocd and RETURNED */
krb5int_cert_sig_status *cert_status,/* optionally RETURNED */
krb5_ui_4 *num_cms_types, /* optionally RETURNED */
krb5int_algorithm_id **cms_types, /* optionally mallocd and RETURNED */
/*
* Cert fields, all optionally RETURNED.
*
* signer_cert is the full X.509 leaf cert from the incoming SignedData.
* all_certs is an array of all of the certs in the incoming SignedData,
* in full X.509 form.
*/
krb5_data *signer_cert, /* content mallocd */
krb5_ui_4 *num_all_certs, /* sizeof *all_certs */
krb5_data **all_certs, /* krb5_data's and their content mallocd */
/*
* Array of trustedCertifiers, optionally RETURNED. These are DER-encoded
* issuer/serial numbers.
*/
krb5_ui_4 *num_trusted_CAs, /* sizeof *trusted_CAs */
krb5_data **trusted_CAs, /* krb5_data's and their content mallocd */
/* KDC cert specified by client as kdcPkId. DER-encoded issuer/serial number. */
krb5_data *kdc_cert)
{
krb5_error_code krtn;
krb5_data signed_auth_pack = {0, 0, NULL};
krb5_data raw_auth_pack = {0, 0, NULL};
krb5_data *raw_auth_pack_p = NULL;
krb5_boolean proceed = FALSE;
krb5_boolean need_auth_pack = FALSE;
krb5int_cms_content_type content_type;
krb5_pkinit_cert_db_t cert_db = NULL;
krb5_boolean is_signed;
krb5_boolean is_encrypted;
assert(as_req != NULL);
/*
* We always have to decode the top-level AS-REQ...
*/
krtn = krb5int_pkinit_pa_pk_as_req_decode(as_req, &signed_auth_pack,
num_trusted_CAs, trusted_CAs, /* optional */
kdc_cert); /* optional */
if (krtn) {
pkiDebug("krb5int_pkinit_pa_pk_as_req_decode returned %d\n", (int)krtn);
return krtn;
}
/* Do we need info about or from the ContentInto or AuthPack? */
if ((kctime != NULL) || (cusec != NULL) || (nonce != NULL) ||
(pa_cksum != NULL) || (cms_types != NULL)) {
need_auth_pack = TRUE;
raw_auth_pack_p = &raw_auth_pack;
}
if (need_auth_pack || (cert_status != NULL) ||
(signer_cert != NULL) || (all_certs != NULL)) {
proceed = TRUE;
}
if (!proceed) {
krtn = 0;
goto err_out;
}
/* Parse and possibly verify the ContentInfo */
krtn = krb5_pkinit_get_kdc_cert_db(&cert_db);
if (krtn) {
pkiDebug("pa_pk_as_req_parse: error in krb5_pkinit_get_kdc_cert_db\n");
goto err_out;
}
krtn = krb5int_pkinit_parse_cms_msg(&signed_auth_pack, cert_db, TRUE,
&is_signed, &is_encrypted,
raw_auth_pack_p, &content_type, signer_cert, cert_status,
num_all_certs, all_certs);
if (krtn) {
pkiDebug("krb5int_pkinit_parse_content_info returned %d\n", (int)krtn);
goto err_out;
}
if (is_encrypted || !is_signed) {
pkiDebug("pkinit_parse_content_info: is_encrypted %s is_signed %s!\n",
is_encrypted ? "true" :"false",
is_signed ? "true" : "false");
krtn = KRB5KDC_ERR_PREAUTH_FAILED;
goto err_out;
}
if (content_type != ECT_PkAuthData) {
pkiDebug("authPack eContentType %d!\n", (int)content_type);
krtn = KRB5KDC_ERR_PREAUTH_FAILED;
goto err_out;
}
/* optionally parse contents of authPack */
if (need_auth_pack) {
krtn = krb5int_pkinit_auth_pack_decode(&raw_auth_pack, kctime,
cusec, nonce, pa_cksum,
cms_types, num_cms_types);
if(krtn) {
pkiDebug("krb5int_pkinit_auth_pack_decode returned %d\n", (int)krtn);
goto err_out;
}
}
err_out:
/* free temp mallocd data that we didn't pass back to caller */
if(signed_auth_pack.data) {
free(signed_auth_pack.data);
}
if(raw_auth_pack.data) {
free(raw_auth_pack.data);
}
if(cert_db) {
krb5_pkinit_release_cert_db(cert_db);
}
return krtn;
}
/*
* Create a PA-PK-AS-REP message, public key (no Diffie Hellman) version.
*
* PA-PK-AS-REP is based on ReplyKeyPack like so:
*
* PA-PK-AS-REP ::= EnvelopedData(SignedData(ReplyKeyPack))
*/
krb5_error_code krb5int_pkinit_as_rep_create(
krb5_context context,
const krb5_keyblock *key_block,
const krb5_checksum *checksum, /* checksum of corresponding AS-REQ */
krb5_pkinit_signing_cert_t signer_cert, /* server's cert */
krb5_boolean include_server_cert,/* include signer_cert in SignerInfo */
const krb5_data *recipient_cert, /* client's cert */
/*
* These correspond to the same out-parameters from
* krb5int_pkinit_as_req_parse(). All are optional.
*/
krb5_ui_4 num_cms_types,
const krb5int_algorithm_id *cms_types,
krb5_ui_4 num_trusted_CAs,
krb5_data *trusted_CAs,
krb5_data *kdc_cert,
krb5_data *as_rep) /* mallocd and RETURNED */
{
krb5_data reply_key_pack = {0, 0, NULL};
krb5_error_code krtn;
krb5_data enc_key_pack = {0, 0, NULL};
/* innermost content = ReplyKeyPack */
krtn = krb5int_pkinit_reply_key_pack_encode(key_block, checksum,
&reply_key_pack);
if (krtn) {
return krtn;
}
/*
* Put that in an EnvelopedData(SignedData)
* -- SignedData.EncapsulatedData.ContentType = id-pkinit-rkeyData
*/
krtn = krb5int_pkinit_create_cms_msg(&reply_key_pack,
signer_cert,
recipient_cert,
ECT_PkReplyKeyKata,
num_cms_types, cms_types,
&enc_key_pack);
if (krtn) {
goto err_out;
}
/*
* Finally, wrap that inside of PA-PK-AS-REP
*/
krtn = krb5int_pkinit_pa_pk_as_rep_encode(NULL, &enc_key_pack, as_rep);
err_out:
if (reply_key_pack.data) {
free(reply_key_pack.data);
}
if (enc_key_pack.data) {
free(enc_key_pack.data);
}
return krtn;
}
#endif /* APPLE_PKINIT */
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