ocsp_ext.c

OpenSSL 0.9.8k 最新版OpenSSL

	if (data)
	        {
		if ((i=i2d(data,NULL)) <= 0) goto err;
		if (!(b=p=OPENSSL_malloc((unsigned int)i)))
			goto err;
	        if (i2d(data, &p) <= 0) goto err;
		}
	else if (sk)
	        {
		if ((i=i2d_ASN1_SET_OF_ASN1_OBJECT(sk,NULL,
						   (I2D_OF(ASN1_OBJECT))i2d,
						   V_ASN1_SEQUENCE,
						   V_ASN1_UNIVERSAL,
						   IS_SEQUENCE))<=0) goto err;
		if (!(b=p=OPENSSL_malloc((unsigned int)i)))
			goto err;
		if (i2d_ASN1_SET_OF_ASN1_OBJECT(sk,&p,(I2D_OF(ASN1_OBJECT))i2d,
						V_ASN1_SEQUENCE,
						V_ASN1_UNIVERSAL,
						IS_SEQUENCE)<=0) goto err;
		}
	else
		{
		OCSPerr(OCSP_F_ASN1_STRING_ENCODE,OCSP_R_BAD_DATA);
		goto err;
		}
	if (!s && !(s = ASN1_STRING_new())) goto err;
	if (!(ASN1_STRING_set(s, b, i))) goto err;
	OPENSSL_free(b);
	return s;
err:
	if (b) OPENSSL_free(b);
	return NULL;
	}

/* Nonce handling functions */

/* Add a nonce to an extension stack. A nonce can be specificed or if NULL
 * a random nonce will be generated.
 * Note: OpenSSL 0.9.7d and later create an OCTET STRING containing the 
 * nonce, previous versions used the raw nonce.
 */

static int ocsp_add1_nonce(STACK_OF(X509_EXTENSION) **exts, unsigned char *val, int len)
	{
	unsigned char *tmpval;
	ASN1_OCTET_STRING os;
	int ret = 0;
	if (len <= 0) len = OCSP_DEFAULT_NONCE_LENGTH;
	/* Create the OCTET STRING manually by writing out the header and
	 * appending the content octets. This avoids an extra memory allocation
	 * operation in some cases. Applications should *NOT* do this because
         * it relies on library internals.
	 */
	os.length = ASN1_object_size(0, len, V_ASN1_OCTET_STRING);
	os.data = OPENSSL_malloc(os.length);
	if (os.data == NULL)
		goto err;
	tmpval = os.data;
	ASN1_put_object(&tmpval, 0, len, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL);
	if (val)
		memcpy(tmpval, val, len);
	else
		RAND_pseudo_bytes(tmpval, len);
	if(!X509V3_add1_i2d(exts, NID_id_pkix_OCSP_Nonce,
			&os, 0, X509V3_ADD_REPLACE))
				goto err;
	ret = 1;
	err:
	if (os.data)
		OPENSSL_free(os.data);
	return ret;
	}


/* Add nonce to an OCSP request */

int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len)
	{
	return ocsp_add1_nonce(&req->tbsRequest->requestExtensions, val, len);
	}

/* Same as above but for a response */

int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len)
	{
	return ocsp_add1_nonce(&resp->tbsResponseData->responseExtensions, val, len);
	}

/* Check nonce validity in a request and response.
 * Return value reflects result:
 *  1: nonces present and equal.
 *  2: nonces both absent.
 *  3: nonce present in response only.
 *  0: nonces both present and not equal.
 * -1: nonce in request only.
 *
 *  For most responders clients can check return > 0.
 *  If responder doesn't handle nonces return != 0 may be
 *  necessary. return == 0 is always an error.
 */

int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *bs)
	{
	/*
	 * Since we are only interested in the presence or absence of
	 * the nonce and comparing its value there is no need to use
	 * the X509V3 routines: this way we can avoid them allocating an
	 * ASN1_OCTET_STRING structure for the value which would be
	 * freed immediately anyway.
	 */

	int req_idx, resp_idx;
	X509_EXTENSION *req_ext, *resp_ext;
	req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
	resp_idx = OCSP_BASICRESP_get_ext_by_NID(bs, NID_id_pkix_OCSP_Nonce, -1);
	/* Check both absent */
	if((req_idx < 0) && (resp_idx < 0))
		return 2;
	/* Check in request only */
	if((req_idx >= 0) && (resp_idx < 0))
		return -1;
	/* Check in response but not request */
	if((req_idx < 0) && (resp_idx >= 0))
		return 3;
	/* Otherwise nonce in request and response so retrieve the extensions */
	req_ext = OCSP_REQUEST_get_ext(req, req_idx);
	resp_ext = OCSP_BASICRESP_get_ext(bs, resp_idx);
	if(ASN1_OCTET_STRING_cmp(req_ext->value, resp_ext->value))
		return 0;
	return 1;
	}

/* Copy the nonce value (if any) from an OCSP request to 
 * a response.
 */

int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req)
	{
	X509_EXTENSION *req_ext;
	int req_idx;
	/* Check for nonce in request */
	req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
	/* If no nonce that's OK */
	if (req_idx < 0) return 2;
	req_ext = OCSP_REQUEST_get_ext(req, req_idx);
	return OCSP_BASICRESP_add_ext(resp, req_ext, -1);
	}

X509_EXTENSION *OCSP_crlID_new(char *url, long *n, char *tim)
        {
	X509_EXTENSION *x = NULL;
	OCSP_CRLID *cid = NULL;
	
	if (!(cid = OCSP_CRLID_new())) goto err;
	if (url)
	        {
		if (!(cid->crlUrl = ASN1_IA5STRING_new())) goto err;
		if (!(ASN1_STRING_set(cid->crlUrl, url, -1))) goto err;
		}
	if (n)
	        {
		if (!(cid->crlNum = ASN1_INTEGER_new())) goto err;
		if (!(ASN1_INTEGER_set(cid->crlNum, *n))) goto err;
		}
	if (tim)
	        {
		if (!(cid->crlTime = ASN1_GENERALIZEDTIME_new())) goto err;
		if (!(ASN1_GENERALIZEDTIME_set_string(cid->crlTime, tim))) 
		        goto err;
		}
	if (!(x = X509_EXTENSION_new())) goto err;
	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_CrlID))) goto err;
	if (!(ASN1_STRING_encode_of(OCSP_CRLID,x->value,i2d_OCSP_CRLID,cid,
				    NULL)))
	        goto err;
	OCSP_CRLID_free(cid);
	return x;
err:
	if (x) X509_EXTENSION_free(x);
	if (cid) OCSP_CRLID_free(cid);
	return NULL;
	}

/*   AcceptableResponses ::= SEQUENCE OF OBJECT IDENTIFIER */
X509_EXTENSION *OCSP_accept_responses_new(char **oids)
        {
	int nid;
	STACK_OF(ASN1_OBJECT) *sk = NULL;
	ASN1_OBJECT *o = NULL;
        X509_EXTENSION *x = NULL;

	if (!(sk = sk_ASN1_OBJECT_new_null())) goto err;
	while (oids && *oids)
	        {
		if ((nid=OBJ_txt2nid(*oids))!=NID_undef&&(o=OBJ_nid2obj(nid))) 
		        sk_ASN1_OBJECT_push(sk, o);
		oids++;
		}
	if (!(x = X509_EXTENSION_new())) goto err;
	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_acceptableResponses)))
		goto err;
	if (!(ASN1_STRING_encode_of(ASN1_OBJECT,x->value,i2d_ASN1_OBJECT,NULL,
				    sk)))
	        goto err;
	sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
	return x;
err:
	if (x) X509_EXTENSION_free(x);
	if (sk) sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
	return NULL;
        }

/*  ArchiveCutoff ::= GeneralizedTime */
X509_EXTENSION *OCSP_archive_cutoff_new(char* tim)
        {
	X509_EXTENSION *x=NULL;
	ASN1_GENERALIZEDTIME *gt = NULL;

	if (!(gt = ASN1_GENERALIZEDTIME_new())) goto err;
	if (!(ASN1_GENERALIZEDTIME_set_string(gt, tim))) goto err;
	if (!(x = X509_EXTENSION_new())) goto err;
	if (!(x->object=OBJ_nid2obj(NID_id_pkix_OCSP_archiveCutoff)))goto err;
	if (!(ASN1_STRING_encode_of(ASN1_GENERALIZEDTIME,x->value,
				    i2d_ASN1_GENERALIZEDTIME,gt,NULL))) goto err;
	ASN1_GENERALIZEDTIME_free(gt);
	return x;
err:
	if (gt) ASN1_GENERALIZEDTIME_free(gt);
	if (x) X509_EXTENSION_free(x);
	return NULL;
	}

/* per ACCESS_DESCRIPTION parameter are oids, of which there are currently
 * two--NID_ad_ocsp, NID_id_ad_caIssuers--and GeneralName value.  This
 * method forces NID_ad_ocsp and uniformResourceLocator [6] IA5String.
 */
X509_EXTENSION *OCSP_url_svcloc_new(X509_NAME* issuer, char **urls)
        {
	X509_EXTENSION *x = NULL;
	ASN1_IA5STRING *ia5 = NULL;
	OCSP_SERVICELOC *sloc = NULL;
	ACCESS_DESCRIPTION *ad = NULL;
	
	if (!(sloc = OCSP_SERVICELOC_new())) goto err;
	if (!(sloc->issuer = X509_NAME_dup(issuer))) goto err;
	if (urls && *urls && !(sloc->locator = sk_ACCESS_DESCRIPTION_new_null())) goto err;
	while (urls && *urls)
	        {
		if (!(ad = ACCESS_DESCRIPTION_new())) goto err;
		if (!(ad->method=OBJ_nid2obj(NID_ad_OCSP))) goto err;
		if (!(ad->location = GENERAL_NAME_new())) goto err;
	        if (!(ia5 = ASN1_IA5STRING_new())) goto err;
		if (!ASN1_STRING_set((ASN1_STRING*)ia5, *urls, -1)) goto err;
		ad->location->type = GEN_URI;
		ad->location->d.ia5 = ia5;
		if (!sk_ACCESS_DESCRIPTION_push(sloc->locator, ad)) goto err;
		urls++;
		}
	if (!(x = X509_EXTENSION_new())) goto err;
	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_serviceLocator))) 
	        goto err;
	if (!(ASN1_STRING_encode_of(OCSP_SERVICELOC,x->value,
				    i2d_OCSP_SERVICELOC,sloc,NULL))) goto err;
	OCSP_SERVICELOC_free(sloc);
	return x;
err:
	if (x) X509_EXTENSION_free(x);
	if (sloc) OCSP_SERVICELOC_free(sloc);
	return NULL;
	}