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/*
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of ARM 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 <stddef.h>
#include <stdio.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
#include "ext.h"
DECLARE_ASN1_ITEM(ASN1_INTEGER)
DECLARE_ASN1_ITEM(ASN1_OCTET_STRING)
/*
* This function adds the TBB extensions to the internal extension list
* maintained by OpenSSL so they can be used later.
*
* It also initializes the methods to print the contents of the extension. If an
* alias is specified in the TBB extension, we reuse the methods of the alias.
* Otherwise, only methods for V_ASN1_INTEGER and V_ASN1_OCTET_STRING are
* provided. Any other type will be printed as a raw ascii string.
*
* Return: 0 = success, Otherwise: error
*/
int ext_init(ext_t *tbb_ext)
{
ext_t *ext;
X509V3_EXT_METHOD *m;
int i = 0, nid, ret;
while ((ext = &tbb_ext[i++]) && ext->oid) {
nid = OBJ_create(ext->oid, ext->sn, ext->ln);
if (ext->alias) {
X509V3_EXT_add_alias(nid, ext->alias);
} else {
m = &ext->method;
memset(m, 0x0, sizeof(X509V3_EXT_METHOD));
switch (ext->type) {
case V_ASN1_INTEGER:
m->it = ASN1_ITEM_ref(ASN1_INTEGER);
m->i2s = (X509V3_EXT_I2S)i2s_ASN1_INTEGER;
m->s2i = (X509V3_EXT_S2I)s2i_ASN1_INTEGER;
break;
case V_ASN1_OCTET_STRING:
m->it = ASN1_ITEM_ref(ASN1_OCTET_STRING);
m->i2s = (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING;
m->s2i = (X509V3_EXT_S2I)s2i_ASN1_OCTET_STRING;
break;
default:
continue;
}
m->ext_nid = nid;
ret = X509V3_EXT_add(m);
if (!ret) {
ERR_print_errors_fp(stdout);
return 1;
}
}
}
return 0;
}
/*
* Create a new extension
*
* Extension ::= SEQUENCE {
* id OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* value OCTET STRING }
*
* Parameters:
* pex: OpenSSL extension pointer (output parameter)
* nid: extension identifier
* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
* data: extension data. This data will be encapsulated in an Octet String
*
* Return: Extension address, NULL if error
*/
static
X509_EXTENSION *ext_new(int nid, int crit, unsigned char *data, int len)
{
X509_EXTENSION *ex;
ASN1_OCTET_STRING *ext_data;
/* Octet string containing the extension data */
ext_data = ASN1_OCTET_STRING_new();
ASN1_OCTET_STRING_set(ext_data, data, len);
/* Create the extension */
ex = X509_EXTENSION_create_by_NID(NULL, nid, crit, ext_data);
/* The extension makes a copy of the data, so we can free this object */
ASN1_OCTET_STRING_free(ext_data);
return ex;
}
/*
* Creates a x509v3 extension containing a hash encapsulated in an ASN1 Octet
* String
*
* Parameters:
* pex: OpenSSL extension pointer (output parameter)
* nid: extension identifier
* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
* buf: pointer to the buffer that contains the hash
* len: size of the hash in bytes
*
* Return: Extension address, NULL if error
*/
X509_EXTENSION *ext_new_hash(int nid, int crit, unsigned char *buf, size_t len)
{
X509_EXTENSION *ex = NULL;
ASN1_OCTET_STRING *hash = NULL;
unsigned char *p = NULL;
int sz = -1;
/* Encode Hash */
hash = ASN1_OCTET_STRING_new();
ASN1_OCTET_STRING_set(hash, buf, len);
sz = i2d_ASN1_OCTET_STRING(hash, NULL);
i2d_ASN1_OCTET_STRING(hash, &p);
/* Create the extension */
ex = ext_new(nid, crit, p, sz);
/* Clean up */
OPENSSL_free(p);
ASN1_OCTET_STRING_free(hash);
return ex;
}
/*
* Creates a x509v3 extension containing a nvcounter encapsulated in an ASN1
* Integer
*
* Parameters:
* pex: OpenSSL extension pointer (output parameter)
* nid: extension identifier
* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
* value: nvcounter value
*
* Return: Extension address, NULL if error
*/
X509_EXTENSION *ext_new_nvcounter(int nid, int crit, int value)
{
X509_EXTENSION *ex = NULL;
ASN1_INTEGER *counter = NULL;
unsigned char *p = NULL;
int sz = -1;
/* Encode counter */
counter = ASN1_INTEGER_new();
ASN1_INTEGER_set(counter, value);
sz = i2d_ASN1_INTEGER(counter, NULL);
i2d_ASN1_INTEGER(counter, &p);
/* Create the extension */
ex = ext_new(nid, crit, p, sz);
/* Free objects */
OPENSSL_free(p);
ASN1_INTEGER_free(counter);
return ex;
}
/*
* Creates a x509v3 extension containing a public key in DER format:
*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*
* Parameters:
* pex: OpenSSL extension pointer (output parameter)
* nid: extension identifier
* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
* k: key
*
* Return: Extension address, NULL if error
*/
X509_EXTENSION *ext_new_key(int nid, int crit, EVP_PKEY *k)
{
X509_EXTENSION *ex = NULL;
unsigned char *p = NULL;
int sz = -1;
/* Encode key */
BIO *mem = BIO_new(BIO_s_mem());
if (i2d_PUBKEY_bio(mem, k) <= 0) {
ERR_print_errors_fp(stderr);
return NULL;
}
p = (unsigned char *)OPENSSL_malloc(4096);
sz = BIO_read(mem, p, 4096);
/* Create the extension */
ex = ext_new(nid, crit, p, sz);
/* Clean up */
OPENSSL_free(p);
return ex;
}
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