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openssl/crypto/cms/cms_ess.c

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/*
* Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/ess.h>
#include "crypto/ess.h"
#include "crypto/x509.h"
#include "cms_local.h"
IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
/* ESS services */
int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
{
ASN1_STRING *str;
CMS_ReceiptRequest *rr;
ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);
if (prr != NULL)
*prr = NULL;
str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
if (str == NULL)
return 0;
rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
if (rr == NULL)
return -1;
if (prr != NULL)
*prr = rr;
else
CMS_ReceiptRequest_free(rr);
return 1;
}
/*
* Returns 0 if attribute is not found, 1 if found,
* or -1 on attribute parsing failure.
*/
static int ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo *si,
ESS_SIGNING_CERT **psc)
{
ASN1_STRING *str;
ESS_SIGNING_CERT *sc;
ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificate);
if (psc != NULL)
*psc = NULL;
str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
if (str == NULL)
return 0;
sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT));
if (sc == NULL)
return -1;
if (psc != NULL)
*psc = sc;
else
ESS_SIGNING_CERT_free(sc);
return 1;
}
/*
* Returns 0 if attribute is not found, 1 if found,
* or -1 on attribute parsing failure.
*/
static int ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo *si,
ESS_SIGNING_CERT_V2 **psc)
{
ASN1_STRING *str;
ESS_SIGNING_CERT_V2 *sc;
ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificateV2);
if (psc != NULL)
*psc = NULL;
str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
if (str == NULL)
return 0;
sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT_V2));
if (sc == NULL)
return -1;
if (psc != NULL)
*psc = sc;
else
ESS_SIGNING_CERT_V2_free(sc);
return 1;
}
int ossl_cms_check_signing_certs(const CMS_SignerInfo *si,
const STACK_OF(X509) *chain)
{
ESS_SIGNING_CERT *ss = NULL;
ESS_SIGNING_CERT_V2 *ssv2 = NULL;
int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0
&& ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0
&& OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;
ESS_SIGNING_CERT_free(ss);
ESS_SIGNING_CERT_V2_free(ssv2);
return ret;
}
CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
unsigned char *id, int idlen, int allorfirst,
STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
OSSL_LIB_CTX *libctx)
{
CMS_ReceiptRequest *rr;
rr = CMS_ReceiptRequest_new();
if (rr == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
if (id)
ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
else {
if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32)) {
ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
goto err;
}
if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32,
0) <= 0)
goto err;
}
sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
rr->receiptsTo = receiptsTo;
if (receiptList != NULL) {
rr->receiptsFrom->type = 1;
rr->receiptsFrom->d.receiptList = receiptList;
} else {
rr->receiptsFrom->type = 0;
rr->receiptsFrom->d.allOrFirstTier = allorfirst;
}
return rr;
err:
CMS_ReceiptRequest_free(rr);
return NULL;
}
CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
unsigned char *id, int idlen, int allorfirst,
STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
{
return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
receiptsTo, NULL);
}
int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
{
unsigned char *rrder = NULL;
int rrderlen, r = 0;
rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
if (rrderlen < 0) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
V_ASN1_SEQUENCE, rrder, rrderlen)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
r = 1;
err:
OPENSSL_free(rrder);
return r;
}
void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
ASN1_STRING **pcid,
int *pallorfirst,
STACK_OF(GENERAL_NAMES) **plist,
STACK_OF(GENERAL_NAMES) **prto)
{
if (pcid != NULL)
*pcid = rr->signedContentIdentifier;
if (rr->receiptsFrom->type == 0) {
if (pallorfirst != NULL)
*pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
if (plist != NULL)
*plist = NULL;
} else {
if (pallorfirst != NULL)
*pallorfirst = -1;
if (plist != NULL)
*plist = rr->receiptsFrom->d.receiptList;
}
if (prto != NULL)
*prto = rr->receiptsTo;
}
/* Digest a SignerInfo structure for msgSigDigest attribute processing */
static int cms_msgSigDigest(CMS_SignerInfo *si,
unsigned char *dig, unsigned int *diglen)
{
const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
if (md == NULL)
return 0;
if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
si->signedAttrs, dig, diglen,
ossl_cms_ctx_get0_libctx(si->cms_ctx),
ossl_cms_ctx_get0_propq(si->cms_ctx)))
return 0;
return 1;
}
/* Add a msgSigDigest attribute to a SignerInfo */
int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
{
unsigned char dig[EVP_MAX_MD_SIZE];
unsigned int diglen;
if (!cms_msgSigDigest(src, dig, &diglen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
return 0;
}
if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
V_ASN1_OCTET_STRING, dig, diglen)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
return 0;
}
return 1;
}
/* Verify signed receipt after it has already passed normal CMS verify */
int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
{
int r = 0, i;
CMS_ReceiptRequest *rr = NULL;
CMS_Receipt *rct = NULL;
STACK_OF(CMS_SignerInfo) *sis, *osis;
CMS_SignerInfo *si, *osi = NULL;
ASN1_OCTET_STRING *msig, **pcont;
ASN1_OBJECT *octype;
unsigned char dig[EVP_MAX_MD_SIZE];
unsigned int diglen;
/* Get SignerInfos, also checks SignedData content type */
osis = CMS_get0_SignerInfos(req_cms);
sis = CMS_get0_SignerInfos(cms);
if (!osis || !sis)
goto err;
if (sk_CMS_SignerInfo_num(sis) != 1) {
ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
goto err;
}
/* Check receipt content type */
if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
goto err;
}
/* Extract and decode receipt content */
pcont = CMS_get0_content(cms);
if (pcont == NULL || *pcont == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
goto err;
}
rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
if (!rct) {
ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
goto err;
}
/* Locate original request */
for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
osi = sk_CMS_SignerInfo_value(osis, i);
if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
break;
}
if (i == sk_CMS_SignerInfo_num(osis)) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
goto err;
}
si = sk_CMS_SignerInfo_value(sis, 0);
/* Get msgSigDigest value and compare */
msig = CMS_signed_get0_data_by_OBJ(si,
OBJ_nid2obj
(NID_id_smime_aa_msgSigDigest), -3,
V_ASN1_OCTET_STRING);
if (!msig) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
goto err;
}
if (!cms_msgSigDigest(osi, dig, &diglen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
goto err;
}
if (diglen != (unsigned int)msig->length) {
ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
goto err;
}
if (memcmp(dig, msig->data, diglen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
goto err;
}
/* Compare content types */
octype = CMS_signed_get0_data_by_OBJ(osi,
OBJ_nid2obj(NID_pkcs9_contentType),
-3, V_ASN1_OBJECT);
if (!octype) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
goto err;
}
/* Compare details in receipt request */
if (OBJ_cmp(octype, rct->contentType)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
goto err;
}
/* Get original receipt request details */
if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
goto err;
}
if (ASN1_STRING_cmp(rr->signedContentIdentifier,
rct->signedContentIdentifier)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
goto err;
}
r = 1;
err:
CMS_ReceiptRequest_free(rr);
M_ASN1_free_of(rct, CMS_Receipt);
return r;
}
/*
* Encode a Receipt into an OCTET STRING read for including into content of a
* SignedData ContentInfo.
*/
ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
{
CMS_Receipt rct;
CMS_ReceiptRequest *rr = NULL;
ASN1_OBJECT *ctype;
ASN1_OCTET_STRING *os = NULL;
/* Get original receipt request */
/* Get original receipt request details */
if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
goto err;
}
/* Get original content type */
ctype = CMS_signed_get0_data_by_OBJ(si,
OBJ_nid2obj(NID_pkcs9_contentType),
-3, V_ASN1_OBJECT);
if (!ctype) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
goto err;
}
rct.version = 1;
rct.contentType = ctype;
rct.signedContentIdentifier = rr->signedContentIdentifier;
rct.originatorSignatureValue = si->signature;
os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
err:
CMS_ReceiptRequest_free(rr);
return os;
}
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