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openssl/crypto/cms/cms_sd.c
Rich Salz 12a765a523 Explicitly test against NULL; do not use !p or similar 
Also added blanks lines after declarations in a couple of places.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9916)
2019-10-09 21:32:15 +02:00

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/*
* Copyright 2008-2016 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 "cms_local.h"
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "crypto/cms.h"
#include "crypto/ess.h"
/* CMS SignedData Utilities */
static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
CMSerr(CMS_F_CMS_GET0_SIGNED, 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) {
CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
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) {
CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
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;
}
CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
return 0;
}
int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
{
switch (type) {
case CMS_SIGNERINFO_ISSUER_SERIAL:
if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
return 0;
break;
case CMS_SIGNERINFO_KEYIDENTIFIER:
if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
return 0;
break;
default:
CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
return 0;
}
sid->type = type;
return 1;
}
int 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 cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
{
if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
else
return -1;
}
static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
{
EVP_PKEY *pkey = si->pkey;
int i;
if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
return 1;
i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
if (i == -2) {
CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
if (i <= 0) {
CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
return 0;
}
return 1;
}
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;
if (!X509_check_private_key(signer, pk)) {
CMSerr(CMS_F_CMS_ADD1_SIGNER,
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)
goto merr;
/* 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->pkey = pk;
si->signer = signer;
si->mctx = EVP_MD_CTX_new();
si->pctx = NULL;
if (si->mctx == NULL) {
CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
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 (!cms_set1_SignerIdentifier(si->sid, signer, type))
goto err;
if (md == NULL) {
int def_nid;
if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
goto err;
md = EVP_get_digestbynid(def_nid);
if (md == NULL) {
CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
goto err;
}
}
if (!md) {
CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
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;
alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
X509_ALGOR_get0(&aoid, NULL, NULL, alg);
if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
break;
}
if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
alg = X509_ALGOR_new();
if (alg == NULL)
goto merr;
X509_ALGOR_set_md(alg, md);
if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
X509_ALGOR_free(alg);
goto merr;
}
}
if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
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)
goto merr;
}
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)
goto merr;
}
if (flags & CMS_CADES) {
ESS_SIGNING_CERT *sc = NULL;
ESS_SIGNING_CERT_V2 *sc2 = NULL;
int add_sc;
if (md == EVP_sha1() || md == NULL) {
if ((sc = ESS_SIGNING_CERT_new_init(signer,
NULL, 1)) == NULL)
goto err;
add_sc = cms_add1_signing_cert(si, sc);
ESS_SIGNING_CERT_free(sc);
} else {
if ((sc2 = ESS_SIGNING_CERT_V2_new_init(md, signer,
NULL, 1)) == NULL)
goto err;
add_sc = 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))
goto merr;
}
if (flags & CMS_KEY_PARAM) {
if (flags & CMS_NOATTR) {
si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
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(si->mctx, &si->pctx, md, NULL, pk) <= 0)
goto err;
}
if (!sd->signerInfos)
sd->signerInfos = sk_CMS_SignerInfo_new_null();
if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
goto merr;
return si;
merr:
CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
err:
M_ASN1_free_of(si, CMS_SignerInfo);
return NULL;
}
static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
{
ASN1_TIME *tt;
int r = 0;
if (t)
tt = t;
else
tt = X509_gmtime_adj(NULL, 0);
if (!tt)
goto merr;
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
tt->type, tt, -1) <= 0)
goto merr;
r = 1;
merr:
if (!t)
ASN1_TIME_free(tt);
if (!r)
CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
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;
sd = cms_get0_signed(cms);
if (!sd)
return NULL;
return sd->signerInfos;
}
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) {
if (!signers) {
signers = sk_X509_new_null();
if (!signers)
return NULL;
}
if (!sk_X509_push(signers, si->signer)) {
sk_X509_free(signers);
return NULL;
}
}
}
return signers;
}
void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
{
if (signer) {
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 cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
}
int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
{
return 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)
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)
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 || (flags & CMS_NOINTERN))
continue;
for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
cch = sk_CMS_CertificateChoices_value(certs, j);
if (cch->type != 0)
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)
*pk = si->pkey;
if (signer)
*signer = si->signer;
if (pdig)
*pdig = si->digestAlgorithm;
if (psig)
*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)
{
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
int r = 0;
EVP_PKEY_CTX *pctx = NULL;
if (mctx == NULL) {
CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!si->pkey) {
CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
goto err;
}
if (!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 md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
goto err;
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 md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
pctx = si->pctx;
if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
goto err;
siglen = EVP_PKEY_size(si->pkey);
sig = OPENSSL_malloc(siglen);
if (sig == NULL) {
CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
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;
sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
if (sig == NULL) {
CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, 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 cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
{
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))
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 EVP_MD *md = NULL;
md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
if (md == NULL)
return 0;
if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
if (!cms_add1_signingTime(si, NULL))
goto err;
}
if (!CMS_si_check_attributes(si))
goto err;
if (si->pctx)
pctx = si->pctx;
else {
EVP_MD_CTX_reset(mctx);
if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
goto err;
si->pctx = pctx;
}
/*
* TODO(3.0): This causes problems when providers are in use, so disabled
* for now. Can we get rid of this completely? AFAICT this ctrl has been
* present since CMS was first put in - but has never been used to do
* anything. All internal implementations just return 1 and ignore this ctrl
* and have always done so by the looks of things. To fix this we could
* convert this ctrl into a param, which would require us to send all the
* signer info data as a set of params...but that is non-trivial and since
* this isn't used by anything it may be better just to remove it.
*/
#if 0
if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
goto err;
}
#endif
alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
ASN1_ITEM_rptr(CMS_Attributes_Sign));
if (!abuf)
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;
/*
* TODO(3.0): This causes problems when providers are in use, so disabled
* for now. Can we get rid of this completely? AFAICT this ctrl has been
* present since CMS was first put in - but has never been used to do
* anything. All internal implementations just return 1 and ignore this ctrl
* and have always done so by the looks of things. To fix this we could
* convert this ctrl into a param, which would require us to send all the
* signer info data as a set of params...but that is non-trivial and since
* this isn't used by anything it may be better just to remove it.
*/
#if 0
if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
goto err;
}
#endif
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;
const EVP_MD *md = NULL;
if (!si->pkey) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
return -1;
}
if (!CMS_si_check_attributes(si))
return -1;
md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
if (md == NULL)
return -1;
if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, ERR_R_MALLOC_FAILURE);
return -1;
}
mctx = si->mctx;
if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
goto err;
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)
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)
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
err:
EVP_MD_CTX_reset(mctx);
return r;
}
/* Create a chain of digest BIOs from a CMS ContentInfo */
BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
{
int i;
CMS_SignedData *sd;
BIO *chain = NULL;
sd = cms_get0_signed(cms);
if (!sd)
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 = cms_DigestAlgorithm_init_bio(digestAlgorithm);
if (!mdbio)
goto err;
if (chain)
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) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, ERR_R_MALLOC_FAILURE);
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) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
goto err;
}
}
if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
goto err;
if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
goto err;
}
/* If messageDigest found compare it */
if (os) {
if (mlen != (unsigned int)os->length) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
goto err;
}
if (memcmp(mval, os->data, mlen)) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
CMS_R_VERIFICATION_FAILURE);
r = 0;
} else
r = 1;
} else {
const EVP_MD *md = EVP_MD_CTX_md(mctx);
pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
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))
goto err;
r = EVP_PKEY_verify(pkctx, si->signature->data,
si->signature->length, mval, mlen);
if (r <= 0) {
CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
CMS_R_VERIFICATION_FAILURE);
r = 0;
}
}
err:
EVP_PKEY_CTX_free(pkctx);
EVP_MD_CTX_free(mctx);
return r;
}
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))
return 0;
}
alg = X509_ALGOR_new();
if (alg == NULL) {
ASN1_INTEGER_free(key);
return 0;
}
X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
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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