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openssl/crypto/cms/cms_sd.c
Tomas Mraz 7ed6de997f Copyright year updates 
Reviewed-by: Neil Horman <nhorman@openssl.org>
Release: yes
2024-09-05 09:35:49 +02:00

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/*
* Copyright 2008-2024 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/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/ess.h>
#include "internal/sizes.h"
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "crypto/ess.h"
#include "crypto/x509.h" /* for ossl_x509_add_cert_new() */
#include "cms_local.h"
/* CMS SignedData Utilities */
static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
return NULL;
}
return cms->d.signedData;
}
static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
{
if (cms->d.other == NULL) {
cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
if (!cms->d.signedData) {
ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
return NULL;
}
cms->d.signedData->version = 1;
cms->d.signedData->encapContentInfo->eContentType =
OBJ_nid2obj(NID_pkcs7_data);
cms->d.signedData->encapContentInfo->partial = 1;
ASN1_OBJECT_free(cms->contentType);
cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
return cms->d.signedData;
}
return cms_get0_signed(cms);
}
/* Just initialise SignedData e.g. for certs only structure */
int CMS_SignedData_init(CMS_ContentInfo *cms)
{
if (cms_signed_data_init(cms))
return 1;
else
return 0;
}
/* Check structures and fixup version numbers (if necessary) */
static void cms_sd_set_version(CMS_SignedData *sd)
{
int i;
CMS_CertificateChoices *cch;
CMS_RevocationInfoChoice *rch;
CMS_SignerInfo *si;
for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
if (cch->type == CMS_CERTCHOICE_OTHER) {
if (sd->version < 5)
sd->version = 5;
} else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
if (sd->version < 4)
sd->version = 4;
} else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
if (sd->version < 3)
sd->version = 3;
}
}
for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
if (rch->type == CMS_REVCHOICE_OTHER) {
if (sd->version < 5)
sd->version = 5;
}
}
if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
&& (sd->version < 3))
sd->version = 3;
for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
if (si->version < 3)
si->version = 3;
if (sd->version < 3)
sd->version = 3;
} else if (si->version < 1) {
si->version = 1;
}
}
if (sd->version < 1)
sd->version = 1;
}
/*
* RFC 5652 Section 11.1 Content Type
* The content-type attribute within signed-data MUST
* 1) be present if there are signed attributes
* 2) match the content type in the signed-data,
* 3) be a signed attribute.
* 4) not have more than one copy of the attribute.
*
* Note that since the CMS_SignerInfo_sign() always adds the "signing time"
* attribute, the content type attribute MUST be added also.
* Assumptions: This assumes that the attribute does not already exist.
*/
static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
{
ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
/* Add the contentType attribute */
return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
V_ASN1_OBJECT, ctype, -1) > 0;
}
/* Copy an existing messageDigest value */
static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
{
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *sitmp;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
ASN1_OCTET_STRING *messageDigest;
sitmp = sk_CMS_SignerInfo_value(sinfos, i);
if (sitmp == si)
continue;
if (CMS_signed_get_attr_count(sitmp) < 0)
continue;
if (OBJ_cmp(si->digestAlgorithm->algorithm,
sitmp->digestAlgorithm->algorithm))
continue;
messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
OBJ_nid2obj
(NID_pkcs9_messageDigest),
-3, V_ASN1_OCTET_STRING);
if (!messageDigest) {
ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
return 0;
}
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
V_ASN1_OCTET_STRING,
messageDigest, -1))
return 1;
else
return 0;
}
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_DIGEST);
return 0;
}
int ossl_cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert,
int type, const CMS_CTX *ctx)
{
switch (type) {
case CMS_SIGNERINFO_ISSUER_SERIAL:
if (!ossl_cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
return 0;
break;
case CMS_SIGNERINFO_KEYIDENTIFIER:
if (!ossl_cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
return 0;
break;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_ID);
return 0;
}
sid->type = type;
return 1;
}
int ossl_cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
ASN1_OCTET_STRING **keyid,
X509_NAME **issuer,
ASN1_INTEGER **sno)
{
if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
if (issuer)
*issuer = sid->d.issuerAndSerialNumber->issuer;
if (sno)
*sno = sid->d.issuerAndSerialNumber->serialNumber;
} else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
if (keyid)
*keyid = sid->d.subjectKeyIdentifier;
} else {
return 0;
}
return 1;
}
int ossl_cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
{
if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
return ossl_cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
return ossl_cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
else
return -1;
}
/* Method to map any, incl. provider-implemented PKEY types to OIDs */
/* (EC)DSA and all provider-delivered signatures implementation is the same */
static int cms_generic_sign(CMS_SignerInfo *si, int verify)
{
if (!ossl_assert(verify == 0 || verify == 1))
return -1;
if (!verify) {
EVP_PKEY *pkey = si->pkey;
int snid, hnid, pknid = EVP_PKEY_get_id(pkey);
X509_ALGOR *alg1, *alg2;
CMS_SignerInfo_get0_algs(si, NULL, NULL, &alg1, &alg2);
if (alg1 == NULL || alg1->algorithm == NULL)
return -1;
hnid = OBJ_obj2nid(alg1->algorithm);
if (hnid == NID_undef)
return -1;
if (pknid <= 0) { /* check whether a provider registered a NID */
const char *typename = EVP_PKEY_get0_type_name(pkey);
if (typename != NULL)
pknid = OBJ_txt2nid(typename);
}
if (!OBJ_find_sigid_by_algs(&snid, hnid, pknid))
return -1;
return X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, NULL);
}
return 1;
}
static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
{
EVP_PKEY *pkey = si->pkey;
int i;
if (EVP_PKEY_is_a(pkey, "DSA") || EVP_PKEY_is_a(pkey, "EC"))
return cms_generic_sign(si, cmd) > 0;
else if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
return ossl_cms_rsa_sign(si, cmd) > 0;
/* Now give engines, providers, etc a chance to handle this */
if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
return cms_generic_sign(si, cmd) > 0;
i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
if (i == -2) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
if (i <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_FAILURE);
return 0;
}
return 1;
}
/* Add SigningCertificate signed attribute to the signer info. */
static int ossl_cms_add1_signing_cert(CMS_SignerInfo *si,
const ESS_SIGNING_CERT *sc)
{
ASN1_STRING *seq = NULL;
unsigned char *p, *pp = NULL;
int ret, len = i2d_ESS_SIGNING_CERT(sc, NULL);
if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
return 0;
p = pp;
i2d_ESS_SIGNING_CERT(sc, &p);
if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
ASN1_STRING_free(seq);
OPENSSL_free(pp);
return 0;
}
OPENSSL_free(pp);
ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
V_ASN1_SEQUENCE, seq, -1);
ASN1_STRING_free(seq);
return ret;
}
/* Add SigningCertificateV2 signed attribute to the signer info. */
static int ossl_cms_add1_signing_cert_v2(CMS_SignerInfo *si,
const ESS_SIGNING_CERT_V2 *sc)
{
ASN1_STRING *seq = NULL;
unsigned char *p, *pp = NULL;
int ret, len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
return 0;
p = pp;
i2d_ESS_SIGNING_CERT_V2(sc, &p);
if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
ASN1_STRING_free(seq);
OPENSSL_free(pp);
return 0;
}
OPENSSL_free(pp);
ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
V_ASN1_SEQUENCE, seq, -1);
ASN1_STRING_free(seq);
return ret;
}
CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
unsigned int flags)
{
CMS_SignedData *sd;
CMS_SignerInfo *si = NULL;
X509_ALGOR *alg;
int i, type;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
if (!X509_check_private_key(signer, pk)) {
ERR_raise(ERR_LIB_CMS, CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
return NULL;
}
sd = cms_signed_data_init(cms);
if (!sd)
goto err;
si = M_ASN1_new_of(CMS_SignerInfo);
if (!si) {
ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
goto err;
}
/* Call for side-effect of computing hash and caching extensions */
X509_check_purpose(signer, -1, -1);
X509_up_ref(signer);
EVP_PKEY_up_ref(pk);
si->cms_ctx = ctx;
si->pkey = pk;
si->signer = signer;
si->mctx = EVP_MD_CTX_new();
si->pctx = NULL;
if (si->mctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
goto err;
}
if (flags & CMS_USE_KEYID) {
si->version = 3;
if (sd->version < 3)
sd->version = 3;
type = CMS_SIGNERINFO_KEYIDENTIFIER;
} else {
type = CMS_SIGNERINFO_ISSUER_SERIAL;
si->version = 1;
}
if (!ossl_cms_set1_SignerIdentifier(si->sid, signer, type, ctx))
goto err;
if (md == NULL) {
int def_nid;
if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0) {
ERR_raise_data(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST,
"pkey nid=%d", EVP_PKEY_get_id(pk));
goto err;
}
md = EVP_get_digestbynid(def_nid);
if (md == NULL) {
ERR_raise_data(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST,
"default md nid=%d", def_nid);
goto err;
}
}
X509_ALGOR_set_md(si->digestAlgorithm, md);
/* See if digest is present in digestAlgorithms */
for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
const ASN1_OBJECT *aoid;
char name[OSSL_MAX_NAME_SIZE];
alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
X509_ALGOR_get0(&aoid, NULL, NULL, alg);
OBJ_obj2txt(name, sizeof(name), aoid, 0);
if (EVP_MD_is_a(md, name))
break;
}
if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
if ((alg = X509_ALGOR_new()) == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
goto err;
}
X509_ALGOR_set_md(alg, md);
if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
X509_ALGOR_free(alg);
ERR_raise(ERR_LIB_CMS, ERR_R_CRYPTO_LIB);
goto err;
}
}
if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0)) {
ERR_raise_data(ERR_LIB_CMS, CMS_R_UNSUPPORTED_SIGNATURE_ALGORITHM,
"pkey nid=%d", EVP_PKEY_get_id(pk));
goto err;
}
if (!(flags & CMS_NOATTR)) {
/*
* Initialize signed attributes structure so other attributes
* such as signing time etc are added later even if we add none here.
*/
if (!si->signedAttrs) {
si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
if (!si->signedAttrs) {
ERR_raise(ERR_LIB_CMS, ERR_R_CRYPTO_LIB);
goto err;
}
}
if (!(flags & CMS_NOSMIMECAP)) {
STACK_OF(X509_ALGOR) *smcap = NULL;
i = CMS_add_standard_smimecap(&smcap);
if (i)
i = CMS_add_smimecap(si, smcap);
sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
if (!i) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
}
if (flags & CMS_CADES) {
ESS_SIGNING_CERT *sc = NULL;
ESS_SIGNING_CERT_V2 *sc2 = NULL;
int add_sc;
if (md == NULL || EVP_MD_is_a(md, SN_sha1)) {
if ((sc = OSSL_ESS_signing_cert_new_init(signer,
NULL, 1)) == NULL)
goto err;
add_sc = ossl_cms_add1_signing_cert(si, sc);
ESS_SIGNING_CERT_free(sc);
} else {
if ((sc2 = OSSL_ESS_signing_cert_v2_new_init(md, signer,
NULL, 1)) == NULL)
goto err;
add_sc = ossl_cms_add1_signing_cert_v2(si, sc2);
ESS_SIGNING_CERT_V2_free(sc2);
}
if (!add_sc)
goto err;
}
if (flags & CMS_REUSE_DIGEST) {
if (!cms_copy_messageDigest(cms, si))
goto err;
if (!cms_set_si_contentType_attr(cms, si))
goto err;
if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
!CMS_SignerInfo_sign(si))
goto err;
}
}
if (!(flags & CMS_NOCERTS)) {
/* NB ignore -1 return for duplicate cert */
if (!CMS_add1_cert(cms, signer)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
}
if (flags & CMS_KEY_PARAM) {
if (flags & CMS_NOATTR) {
si->pctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
si->pkey,
ossl_cms_ctx_get0_propq(ctx));
if (si->pctx == NULL)
goto err;
if (EVP_PKEY_sign_init(si->pctx) <= 0)
goto err;
if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
goto err;
} else if (EVP_DigestSignInit_ex(si->mctx, &si->pctx,
EVP_MD_get0_name(md),
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx),
pk, NULL) <= 0) {
si->pctx = NULL;
goto err;
}
else {
EVP_MD_CTX_set_flags(si->mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
}
}
if (sd->signerInfos == NULL)
sd->signerInfos = sk_CMS_SignerInfo_new_null();
if (sd->signerInfos == NULL || !sk_CMS_SignerInfo_push(sd->signerInfos, si)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CRYPTO_LIB);
goto err;
}
return si;
err:
M_ASN1_free_of(si, CMS_SignerInfo);
return NULL;
}
void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
{
int i;
CMS_SignerInfo *si;
STACK_OF(CMS_SignerInfo) *sinfos;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
ERR_set_mark();
sinfos = CMS_get0_SignerInfos(cms);
ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (si != NULL)
si->cms_ctx = ctx;
}
}
static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
{
ASN1_TIME *tt;
int r = 0;
if (t != NULL)
tt = t;
else
tt = X509_gmtime_adj(NULL, 0);
if (tt == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_X509_LIB);
goto err;
}
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
tt->type, tt, -1) <= 0) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
r = 1;
err:
if (t == NULL)
ASN1_TIME_free(tt);
return r;
}
EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
{
return si->pctx;
}
EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
{
return si->mctx;
}
STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
{
CMS_SignedData *sd = cms_get0_signed(cms);
return sd != NULL ? sd->signerInfos : NULL;
}
STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
{
STACK_OF(X509) *signers = NULL;
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *si;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (si->signer != NULL) {
if (!ossl_x509_add_cert_new(&signers, si->signer,
X509_ADD_FLAG_DEFAULT)) {
sk_X509_free(signers);
return NULL;
}
}
}
return signers;
}
void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
{
if (signer != NULL) {
X509_up_ref(signer);
EVP_PKEY_free(si->pkey);
si->pkey = X509_get_pubkey(signer);
}
X509_free(si->signer);
si->signer = signer;
}
int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
ASN1_OCTET_STRING **keyid,
X509_NAME **issuer, ASN1_INTEGER **sno)
{
return ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
}
int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
{
return ossl_cms_SignerIdentifier_cert_cmp(si->sid, cert);
}
int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
unsigned int flags)
{
CMS_SignedData *sd;
CMS_SignerInfo *si;
CMS_CertificateChoices *cch;
STACK_OF(CMS_CertificateChoices) *certs;
X509 *x;
int i, j;
int ret = 0;
sd = cms_get0_signed(cms);
if (sd == NULL)
return -1;
certs = sd->certificates;
for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
if (si->signer != NULL)
continue;
for (j = 0; j < sk_X509_num(scerts); j++) {
x = sk_X509_value(scerts, j);
if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
CMS_SignerInfo_set1_signer_cert(si, x);
ret++;
break;
}
}
if (si->signer != NULL || (flags & CMS_NOINTERN))
continue;
for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
cch = sk_CMS_CertificateChoices_value(certs, j);
if (cch->type != CMS_CERTCHOICE_CERT)
continue;
x = cch->d.certificate;
if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
CMS_SignerInfo_set1_signer_cert(si, x);
ret++;
break;
}
}
}
return ret;
}
void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
X509 **signer, X509_ALGOR **pdig,
X509_ALGOR **psig)
{
if (pk != NULL)
*pk = si->pkey;
if (signer != NULL)
*signer = si->signer;
if (pdig != NULL)
*pdig = si->digestAlgorithm;
if (psig != NULL)
*psig = si->signatureAlgorithm;
}
ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
{
return si->signature;
}
static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
CMS_SignerInfo *si, BIO *chain,
const unsigned char *md,
unsigned int mdlen)
{
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
int r = 0;
EVP_PKEY_CTX *pctx = NULL;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
if (mctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
return 0;
}
if (si->pkey == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
goto err;
}
if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
goto err;
/* Set SignerInfo algorithm details if we used custom parameter */
if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
goto err;
/*
* If any signed attributes calculate and add messageDigest attribute
*/
if (CMS_signed_get_attr_count(si) >= 0) {
unsigned char computed_md[EVP_MAX_MD_SIZE];
if (md == NULL) {
if (!EVP_DigestFinal_ex(mctx, computed_md, &mdlen))
goto err;
md = computed_md;
}
if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
V_ASN1_OCTET_STRING, md, mdlen))
goto err;
/* Copy content type across */
if (!cms_set_si_contentType_attr(cms, si))
goto err;
if (!CMS_SignerInfo_sign(si))
goto err;
} else if (si->pctx) {
unsigned char *sig;
size_t siglen;
unsigned char computed_md[EVP_MAX_MD_SIZE];
pctx = si->pctx;
si->pctx = NULL;
if (md == NULL) {
if (!EVP_DigestFinal_ex(mctx, computed_md, &mdlen))
goto err;
md = computed_md;
}
siglen = EVP_PKEY_get_size(si->pkey);
if (siglen == 0 || (sig = OPENSSL_malloc(siglen)) == NULL)
goto err;
if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
OPENSSL_free(sig);
goto err;
}
ASN1_STRING_set0(si->signature, sig, siglen);
} else {
unsigned char *sig;
unsigned int siglen;
if (md != NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_OPERATION_UNSUPPORTED);
goto err;
}
siglen = EVP_PKEY_get_size(si->pkey);
if (siglen == 0 || (sig = OPENSSL_malloc(siglen)) == NULL)
goto err;
if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx))) {
ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
OPENSSL_free(sig);
goto err;
}
ASN1_STRING_set0(si->signature, sig, siglen);
}
r = 1;
err:
EVP_MD_CTX_free(mctx);
EVP_PKEY_CTX_free(pctx);
return r;
}
int ossl_cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain,
const unsigned char *precomp_md,
unsigned int precomp_mdlen)
{
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *si;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (!cms_SignerInfo_content_sign(cms, si, chain,
precomp_md, precomp_mdlen))
return 0;
}
cms->d.signedData->encapContentInfo->partial = 0;
return 1;
}
int CMS_SignerInfo_sign(CMS_SignerInfo *si)
{
EVP_MD_CTX *mctx = si->mctx;
EVP_PKEY_CTX *pctx = NULL;
unsigned char *abuf = NULL;
int alen;
size_t siglen;
const CMS_CTX *ctx = si->cms_ctx;
char md_name[OSSL_MAX_NAME_SIZE];
if (OBJ_obj2txt(md_name, sizeof(md_name),
si->digestAlgorithm->algorithm, 0) <= 0)
return 0;
if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
if (!cms_add1_signingTime(si, NULL))
goto err;
}
if (!ossl_cms_si_check_attributes(si))
goto err;
if (si->pctx) {
pctx = si->pctx;
} else {
EVP_MD_CTX_reset(mctx);
if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx), si->pkey,
NULL) <= 0)
goto err;
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
si->pctx = pctx;
}
alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
ASN1_ITEM_rptr(CMS_Attributes_Sign));
if (alen < 0 || abuf == NULL)
goto err;
if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
goto err;
if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
goto err;
OPENSSL_free(abuf);
abuf = OPENSSL_malloc(siglen);
if (abuf == NULL)
goto err;
if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
goto err;
EVP_MD_CTX_reset(mctx);
ASN1_STRING_set0(si->signature, abuf, siglen);
return 1;
err:
OPENSSL_free(abuf);
EVP_MD_CTX_reset(mctx);
return 0;
}
int CMS_SignerInfo_verify(CMS_SignerInfo *si)
{
EVP_MD_CTX *mctx = NULL;
unsigned char *abuf = NULL;
int alen, r = -1;
char name[OSSL_MAX_NAME_SIZE];
const EVP_MD *md;
EVP_MD *fetched_md = NULL;
const CMS_CTX *ctx = si->cms_ctx;
OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
const char *propq = ossl_cms_ctx_get0_propq(ctx);
if (si->pkey == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
return -1;
}
if (!ossl_cms_si_check_attributes(si))
return -1;
OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
(void)ERR_set_mark();
fetched_md = EVP_MD_fetch(libctx, name, propq);
if (fetched_md != NULL)
md = fetched_md;
else
md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
if (md == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
return -1;
}
(void)ERR_pop_to_mark();
if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
goto err;
}
mctx = si->mctx;
if (si->pctx != NULL) {
EVP_PKEY_CTX_free(si->pctx);
si->pctx = NULL;
}
if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
propq, si->pkey, NULL) <= 0) {
si->pctx = NULL;
goto err;
}
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
if (!cms_sd_asn1_ctrl(si, 1))
goto err;
alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
ASN1_ITEM_rptr(CMS_Attributes_Verify));
if (abuf == NULL || alen < 0)
goto err;
r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
OPENSSL_free(abuf);
if (r <= 0) {
r = -1;
goto err;
}
r = EVP_DigestVerifyFinal(mctx,
si->signature->data, si->signature->length);
if (r <= 0)
ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
err:
EVP_MD_free(fetched_md);
EVP_MD_CTX_reset(mctx);
return r;
}
/* Create a chain of digest BIOs from a CMS ContentInfo */
BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
{
int i;
CMS_SignedData *sd;
BIO *chain = NULL;
sd = cms_get0_signed(cms);
if (sd == NULL)
return NULL;
if (cms->d.signedData->encapContentInfo->partial)
cms_sd_set_version(sd);
for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
X509_ALGOR *digestAlgorithm;
BIO *mdbio;
digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
mdbio = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
ossl_cms_get0_cmsctx(cms));
if (mdbio == NULL)
goto err;
if (chain != NULL)
BIO_push(chain, mdbio);
else
chain = mdbio;
}
return chain;
err:
BIO_free_all(chain);
return NULL;
}
int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
{
ASN1_OCTET_STRING *os = NULL;
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
EVP_PKEY_CTX *pkctx = NULL;
int r = -1;
unsigned char mval[EVP_MAX_MD_SIZE];
unsigned int mlen;
if (mctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
goto err;
}
/* If we have any signed attributes look for messageDigest value */
if (CMS_signed_get_attr_count(si) >= 0) {
os = CMS_signed_get0_data_by_OBJ(si,
OBJ_nid2obj(NID_pkcs9_messageDigest),
-3, V_ASN1_OCTET_STRING);
if (os == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
goto err;
}
}
if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
goto err;
if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
goto err;
}
/* If messageDigest found compare it */
if (os != NULL) {
if (mlen != (unsigned int)os->length) {
ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
goto err;
}
if (memcmp(mval, os->data, mlen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
r = 0;
} else {
r = 1;
}
} else {
const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
const CMS_CTX *ctx = si->cms_ctx;
pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
si->pkey,
ossl_cms_ctx_get0_propq(ctx));
if (pkctx == NULL)
goto err;
if (EVP_PKEY_verify_init(pkctx) <= 0)
goto err;
if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
goto err;
si->pctx = pkctx;
if (!cms_sd_asn1_ctrl(si, 1)) {
si->pctx = NULL;
goto err;
}
si->pctx = NULL;
r = EVP_PKEY_verify(pkctx, si->signature->data,
si->signature->length, mval, mlen);
if (r <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
r = 0;
}
}
err:
EVP_PKEY_CTX_free(pkctx);
EVP_MD_CTX_free(mctx);
return r;
}
BIO *CMS_SignedData_verify(CMS_SignedData *sd, BIO *detached_data,
STACK_OF(X509) *scerts, X509_STORE *store,
STACK_OF(X509) *extra, STACK_OF(X509_CRL) *crls,
unsigned int flags,
OSSL_LIB_CTX *libctx, const char *propq)
{
CMS_ContentInfo *ci;
BIO *bio = NULL;
int i, res = 0;
if (sd == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if ((ci = CMS_ContentInfo_new_ex(libctx, propq)) == NULL)
return NULL;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
goto end;
ci->contentType = OBJ_nid2obj(NID_pkcs7_signed);
ci->d.signedData = sd;
for (i = 0; i < sk_X509_num(extra); i++)
if (!CMS_add1_cert(ci, sk_X509_value(extra, i)))
goto end;
for (i = 0; i < sk_X509_CRL_num(crls); i++)
if (!CMS_add1_crl(ci, sk_X509_CRL_value(crls, i)))
goto end;
res = CMS_verify(ci, scerts, store, detached_data, bio, flags);
end:
if (ci != NULL)
ci->d.signedData = NULL; /* do not indirectly free |sd| */
CMS_ContentInfo_free(ci);
if (!res) {
BIO_free(bio);
bio = NULL;
}
return bio;
}
int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
{
unsigned char *smder = NULL;
int smderlen, r;
smderlen = i2d_X509_ALGORS(algs, &smder);
if (smderlen <= 0)
return 0;
r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
V_ASN1_SEQUENCE, smder, smderlen);
OPENSSL_free(smder);
return r;
}
int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
int algnid, int keysize)
{
X509_ALGOR *alg;
ASN1_INTEGER *key = NULL;
if (keysize > 0) {
key = ASN1_INTEGER_new();
if (key == NULL || !ASN1_INTEGER_set(key, keysize)) {
ASN1_INTEGER_free(key);
return 0;
}
}
alg = ossl_X509_ALGOR_from_nid(algnid, key != NULL ? V_ASN1_INTEGER :
V_ASN1_UNDEF, key);
if (alg == NULL) {
ASN1_INTEGER_free(key);
return 0;
}
if (*algs == NULL)
*algs = sk_X509_ALGOR_new_null();
if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
X509_ALGOR_free(alg);
return 0;
}
return 1;
}
/* Check to see if a cipher exists and if so add S/MIME capabilities */
static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
{
if (EVP_get_cipherbynid(nid))
return CMS_add_simple_smimecap(sk, nid, arg);
return 1;
}
static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
{
if (EVP_get_digestbynid(nid))
return CMS_add_simple_smimecap(sk, nid, arg);
return 1;
}
int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
{
if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
|| !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
|| !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
|| !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
|| !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
|| !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
|| !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
|| !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
|| !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
|| !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
|| !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
|| !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
return 0;
return 1;
}
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