mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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ad2c1a9aa7
This patch introduces a new API that allows to specify command line options in the Chain of Trust description. These command line options may be used to specify parameters related to the CoT (i.e. keys or certificates), instead of keeping a hardcoded list of options in main.c. Change-Id: I282b0b01cb9add557b26bddc238a28253ce05e44
330 lines
8.5 KiB
C
330 lines
8.5 KiB
C
/*
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* Copyright (c) 2015, ARM Limited and Contributors. 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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/err.h>
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#include <openssl/x509v3.h>
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#include "cmd_opt.h"
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#include "ext.h"
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DECLARE_ASN1_ITEM(ASN1_INTEGER)
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DECLARE_ASN1_ITEM(X509_ALGOR)
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DECLARE_ASN1_ITEM(ASN1_OCTET_STRING)
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typedef struct {
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X509_ALGOR *hashAlgorithm;
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ASN1_OCTET_STRING *dataHash;
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} HASH;
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ASN1_SEQUENCE(HASH) = {
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ASN1_SIMPLE(HASH, hashAlgorithm, X509_ALGOR),
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ASN1_SIMPLE(HASH, dataHash, ASN1_OCTET_STRING),
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} ASN1_SEQUENCE_END(HASH)
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DECLARE_ASN1_FUNCTIONS(HASH)
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IMPLEMENT_ASN1_FUNCTIONS(HASH)
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/*
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* This function adds the TBB extensions to the internal extension list
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* maintained by OpenSSL so they can be used later.
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*
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* It also initializes the methods to print the contents of the extension. If an
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* alias is specified in the TBB extension, we reuse the methods of the alias.
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* Otherwise, only methods for V_ASN1_INTEGER and V_ASN1_OCTET_STRING are
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* provided. Any other type will be printed as a raw ascii string.
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*
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* Return: 0 = success, Otherwise: error
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*/
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int ext_init(void)
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{
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ext_t *ext;
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X509V3_EXT_METHOD *m;
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int nid, ret;
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unsigned int i;
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for (i = 0; i < num_extensions; i++) {
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ext = &extensions[i];
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/* Register command line option */
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if (ext->opt) {
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if (cmd_opt_add(ext->opt, required_argument,
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CMD_OPT_EXT)) {
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return 1;
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}
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}
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/* Register the extension OID in OpenSSL */
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if (ext->oid == NULL) {
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continue;
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}
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nid = OBJ_create(ext->oid, ext->sn, ext->ln);
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if (ext->alias) {
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X509V3_EXT_add_alias(nid, ext->alias);
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} else {
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m = &ext->method;
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memset(m, 0x0, sizeof(X509V3_EXT_METHOD));
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switch (ext->asn1_type) {
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case V_ASN1_INTEGER:
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m->it = ASN1_ITEM_ref(ASN1_INTEGER);
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m->i2s = (X509V3_EXT_I2S)i2s_ASN1_INTEGER;
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m->s2i = (X509V3_EXT_S2I)s2i_ASN1_INTEGER;
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break;
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case V_ASN1_OCTET_STRING:
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m->it = ASN1_ITEM_ref(ASN1_OCTET_STRING);
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m->i2s = (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING;
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m->s2i = (X509V3_EXT_S2I)s2i_ASN1_OCTET_STRING;
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break;
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default:
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continue;
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}
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m->ext_nid = nid;
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ret = X509V3_EXT_add(m);
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if (!ret) {
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ERR_print_errors_fp(stdout);
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return 1;
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}
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}
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}
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return 0;
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}
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/*
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* Create a new extension
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*
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* Extension ::= SEQUENCE {
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* id OBJECT IDENTIFIER,
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* critical BOOLEAN DEFAULT FALSE,
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* value OCTET STRING }
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*
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* Parameters:
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* pex: OpenSSL extension pointer (output parameter)
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* nid: extension identifier
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* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
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* data: extension data. This data will be encapsulated in an Octet String
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*
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* Return: Extension address, NULL if error
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*/
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static
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X509_EXTENSION *ext_new(int nid, int crit, unsigned char *data, int len)
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{
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X509_EXTENSION *ex;
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ASN1_OCTET_STRING *ext_data;
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/* Octet string containing the extension data */
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ext_data = ASN1_OCTET_STRING_new();
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ASN1_OCTET_STRING_set(ext_data, data, len);
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/* Create the extension */
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ex = X509_EXTENSION_create_by_NID(NULL, nid, crit, ext_data);
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/* The extension makes a copy of the data, so we can free this object */
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ASN1_OCTET_STRING_free(ext_data);
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return ex;
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}
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/*
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* Creates a x509v3 extension containing a hash
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*
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* DigestInfo ::= SEQUENCE {
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* digestAlgorithm AlgorithmIdentifier,
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* digest OCTET STRING
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* }
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*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL
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* }
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*
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* Parameters:
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* nid: extension identifier
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* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
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* md: hash algorithm
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* buf: pointer to the buffer that contains the hash
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* len: size of the hash in bytes
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*
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* Return: Extension address, NULL if error
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*/
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X509_EXTENSION *ext_new_hash(int nid, int crit, const EVP_MD *md,
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unsigned char *buf, size_t len)
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{
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X509_EXTENSION *ex = NULL;
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ASN1_OCTET_STRING *octet = NULL;
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HASH *hash = NULL;
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ASN1_OBJECT *algorithm = NULL;
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X509_ALGOR *x509_algor = NULL;
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unsigned char *p = NULL;
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int sz = -1;
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/* OBJECT_IDENTIFIER with hash algorithm */
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algorithm = OBJ_nid2obj(md->type);
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if (algorithm == NULL) {
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return NULL;
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}
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/* Create X509_ALGOR */
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x509_algor = X509_ALGOR_new();
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if (x509_algor == NULL) {
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return NULL;
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}
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x509_algor->algorithm = algorithm;
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x509_algor->parameter = ASN1_TYPE_new();
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ASN1_TYPE_set(x509_algor->parameter, V_ASN1_NULL, NULL);
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/* OCTET_STRING with the actual hash */
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octet = ASN1_OCTET_STRING_new();
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if (octet == NULL) {
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X509_ALGOR_free(x509_algor);
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return NULL;
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}
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ASN1_OCTET_STRING_set(octet, buf, len);
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/* HASH structure containing algorithm + hash */
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hash = HASH_new();
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if (hash == NULL) {
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ASN1_OCTET_STRING_free(octet);
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X509_ALGOR_free(x509_algor);
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return NULL;
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}
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hash->hashAlgorithm = x509_algor;
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hash->dataHash = octet;
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/* DER encoded HASH */
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sz = i2d_HASH(hash, &p);
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if ((sz <= 0) || (p == NULL)) {
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HASH_free(hash);
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X509_ALGOR_free(x509_algor);
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return NULL;
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}
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/* Create the extension */
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ex = ext_new(nid, crit, p, sz);
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/* Clean up */
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OPENSSL_free(p);
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HASH_free(hash);
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return ex;
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}
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/*
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* Creates a x509v3 extension containing a nvcounter encapsulated in an ASN1
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* Integer
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*
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* Parameters:
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* pex: OpenSSL extension pointer (output parameter)
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* nid: extension identifier
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* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
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* value: nvcounter value
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*
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* Return: Extension address, NULL if error
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*/
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X509_EXTENSION *ext_new_nvcounter(int nid, int crit, int value)
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{
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X509_EXTENSION *ex = NULL;
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ASN1_INTEGER *counter = NULL;
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unsigned char *p = NULL;
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int sz = -1;
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/* Encode counter */
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counter = ASN1_INTEGER_new();
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ASN1_INTEGER_set(counter, value);
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sz = i2d_ASN1_INTEGER(counter, NULL);
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i2d_ASN1_INTEGER(counter, &p);
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/* Create the extension */
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ex = ext_new(nid, crit, p, sz);
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/* Free objects */
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OPENSSL_free(p);
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ASN1_INTEGER_free(counter);
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return ex;
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}
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/*
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* Creates a x509v3 extension containing a public key in DER format:
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*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*
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* Parameters:
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* pex: OpenSSL extension pointer (output parameter)
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* nid: extension identifier
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* crit: extension critical (EXT_NON_CRIT, EXT_CRIT)
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* k: key
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*
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* Return: Extension address, NULL if error
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*/
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X509_EXTENSION *ext_new_key(int nid, int crit, EVP_PKEY *k)
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{
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X509_EXTENSION *ex = NULL;
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unsigned char *p = NULL;
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int sz = -1;
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/* Encode key */
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BIO *mem = BIO_new(BIO_s_mem());
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if (i2d_PUBKEY_bio(mem, k) <= 0) {
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ERR_print_errors_fp(stderr);
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return NULL;
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}
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p = (unsigned char *)OPENSSL_malloc(4096);
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sz = BIO_read(mem, p, 4096);
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/* Create the extension */
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ex = ext_new(nid, crit, p, sz);
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/* Clean up */
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OPENSSL_free(p);
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return ex;
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}
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ext_t *ext_get_by_opt(const char *opt)
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{
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ext_t *ext = NULL;
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unsigned int i;
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/* Sequential search. This is not a performance concern since the number
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* of extensions is bounded and the code runs on a host machine */
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for (i = 0; i < num_extensions; i++) {
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ext = &extensions[i];
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if (ext->opt && !strcmp(ext->opt, opt)) {
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return ext;
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}
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}
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return NULL;
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}
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