cert.c

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/*
 * Copyright (c) 2004 - 2007 Kungliga Tekniska H鰃skolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "hx_locl.h"
RCSID("$Id: cert.c 22583 2008-02-11 20:46:21Z lha $");
#include "crypto-headers.h"
#include <rtbl.h>

/**
 * @page page_cert The basic certificate
 *
 * The basic hx509 cerificate object in hx509 is hx509_cert. The
 * hx509_cert object is representing one X509/PKIX certificate and
 * associated attributes; like private key, friendly name, etc.
 *
 * A hx509_cert object is usully found via the keyset interfaces (@ref
 * page_keyset), but its also possible to create a certificate
 * directly from a parsed object with hx509_cert_init() and
 * hx509_cert_init_data().
 *
 * See the library functions here: @ref hx509_cert
 */

struct hx509_verify_ctx_data {
    hx509_certs trust_anchors;
    int flags;
#define HX509_VERIFY_CTX_F_TIME_SET			1
#define HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE	2
#define HX509_VERIFY_CTX_F_REQUIRE_RFC3280		4
#define HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS		8
#define HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS		16
    time_t time_now;
    unsigned int max_depth;
#define HX509_VERIFY_MAX_DEPTH 30
    hx509_revoke_ctx revoke_ctx;
};

#define REQUIRE_RFC3280(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_REQUIRE_RFC3280)
#define CHECK_TA(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS)
#define ALLOW_DEF_TA(ctx) (((ctx)->flags & HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS) == 0)

struct _hx509_cert_attrs {
    size_t len;
    hx509_cert_attribute *val;
};

struct hx509_cert_data {
    unsigned int ref;
    char *friendlyname;
    Certificate *data;
    hx509_private_key private_key;
    struct _hx509_cert_attrs attrs;
    hx509_name basename;
    _hx509_cert_release_func release;
    void *ctx;
};

typedef struct hx509_name_constraints {
    NameConstraints *val;
    size_t len;
} hx509_name_constraints;

#define GeneralSubtrees_SET(g,var) \
	(g)->len = (var)->len, (g)->val = (var)->val;

/**
 * Creates a hx509 context that most functions in the library
 * uses. The context is only allowed to be used by one thread at each
 * moment. Free the context with hx509_context_free().
 *
 * @param context Returns a pointer to new hx509 context.
 *
 * @return Returns an hx509 error code.
 *
 * @ingroup hx509
 */

int
hx509_context_init(hx509_context *context)
{
    *context = calloc(1, sizeof(**context));
    if (*context == NULL)
	return ENOMEM;

    _hx509_ks_null_register(*context);
    _hx509_ks_mem_register(*context);
    _hx509_ks_file_register(*context);
    _hx509_ks_pkcs12_register(*context);
    _hx509_ks_pkcs11_register(*context);
    _hx509_ks_dir_register(*context);
    _hx509_ks_keychain_register(*context);

    ENGINE_add_conf_module();
    OpenSSL_add_all_algorithms();

    (*context)->ocsp_time_diff = HX509_DEFAULT_OCSP_TIME_DIFF;

    initialize_hx_error_table_r(&(*context)->et_list);
    initialize_asn1_error_table_r(&(*context)->et_list);

#ifdef HX509_DEFAULT_ANCHORS
    (void)hx509_certs_init(*context, HX509_DEFAULT_ANCHORS, 0,
			   NULL, &(*context)->default_trust_anchors);
#endif

    return 0;
}

/**
 * Selects if the hx509_revoke_verify() function is going to require
 * the existans of a revokation method (OSCP, CRL) or not. Note that
 * hx509_verify_path(), hx509_cms_verify_signed(), and other function
 * call hx509_revoke_verify().
 * 
 * @param context hx509 context to change the flag for.
 * @param flag zero, revokation method required, non zero missing
 * revokation method ok
 *
 * @ingroup hx509_verify
 */

void
hx509_context_set_missing_revoke(hx509_context context, int flag)
{
    if (flag)
	context->flags |= HX509_CTX_VERIFY_MISSING_OK;
    else
	context->flags &= ~HX509_CTX_VERIFY_MISSING_OK;
}

/**
 * Free the context allocated by hx509_context_init().
 * 
 * @param context context to be freed.
 *
 * @ingroup hx509
 */

void
hx509_context_free(hx509_context *context)
{
    hx509_clear_error_string(*context);
    if ((*context)->ks_ops) {
	free((*context)->ks_ops);
	(*context)->ks_ops = NULL;
    }
    (*context)->ks_num_ops = 0;
    free_error_table ((*context)->et_list);
    if ((*context)->querystat)
	free((*context)->querystat);
    memset(*context, 0, sizeof(**context));
    free(*context);
    *context = NULL;
}

/*
 *
 */

Certificate *
_hx509_get_cert(hx509_cert cert)
{
    return cert->data;
}

/*
 *
 */

int
_hx509_cert_get_version(const Certificate *t)
{
    return t->tbsCertificate.version ? *t->tbsCertificate.version + 1 : 1;
}

/**
 * Allocate and init an hx509 certificate object from the decoded
 * certificate `c