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/*
* Copyright 2008-2022 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 <openssl/asn1t.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/bio.h>
#include <openssl/asn1.h>
#include <openssl/cms.h>
#include "internal/sizes.h"
#include "crypto/x509.h"
#include "cms_local.h"
static STACK_OF(CMS_CertificateChoices)
**cms_get0_certificate_choices(CMS_ContentInfo *cms);
IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
CMS_ContentInfo *d2i_CMS_ContentInfo(CMS_ContentInfo **a,
const unsigned char **in, long len)
{
CMS_ContentInfo *ci;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(a == NULL ? NULL : *a);
ci = (CMS_ContentInfo *)ASN1_item_d2i_ex((ASN1_VALUE **)a, in, len,
(CMS_ContentInfo_it()),
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx));
if (ci != NULL)
ossl_cms_resolve_libctx(ci);
return ci;
}
int i2d_CMS_ContentInfo(const CMS_ContentInfo *a, unsigned char **out)
{
return ASN1_item_i2d((const ASN1_VALUE *)a, out, (CMS_ContentInfo_it()));
}
CMS_ContentInfo *CMS_ContentInfo_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
{
CMS_ContentInfo *ci;
ci = (CMS_ContentInfo *)ASN1_item_new_ex(ASN1_ITEM_rptr(CMS_ContentInfo),
libctx, propq);
if (ci != NULL) {
ci->ctx.libctx = libctx;
ci->ctx.propq = NULL;
if (propq != NULL) {
ci->ctx.propq = OPENSSL_strdup(propq);
if (ci->ctx.propq == NULL) {
CMS_ContentInfo_free(ci);
ci = NULL;
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
}
}
}
return ci;
}
CMS_ContentInfo *CMS_ContentInfo_new(void)
{
return CMS_ContentInfo_new_ex(NULL, NULL);
}
void CMS_ContentInfo_free(CMS_ContentInfo *cms)
{
if (cms != NULL) {
OPENSSL_free(cms->ctx.propq);
ASN1_item_free((ASN1_VALUE *)cms, ASN1_ITEM_rptr(CMS_ContentInfo));
}
}
const CMS_CTX *ossl_cms_get0_cmsctx(const CMS_ContentInfo *cms)
{
return cms != NULL ? &cms->ctx : NULL;
}
OSSL_LIB_CTX *ossl_cms_ctx_get0_libctx(const CMS_CTX *ctx)
{
return ctx != NULL ? ctx->libctx : NULL;
}
const char *ossl_cms_ctx_get0_propq(const CMS_CTX *ctx)
{
return ctx != NULL ? ctx->propq : NULL;
}
void ossl_cms_resolve_libctx(CMS_ContentInfo *ci)
{
int i;
CMS_CertificateChoices *cch;
STACK_OF(CMS_CertificateChoices) **pcerts;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(ci);
OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
const char *propq = ossl_cms_ctx_get0_propq(ctx);
ossl_cms_SignerInfos_set_cmsctx(ci);
ossl_cms_RecipientInfos_set_cmsctx(ci);
pcerts = cms_get0_certificate_choices(ci);
if (pcerts != NULL) {
for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) {
cch = sk_CMS_CertificateChoices_value(*pcerts, i);
if (cch->type == CMS_CERTCHOICE_CERT)
ossl_x509_set0_libctx(cch->d.certificate, libctx, propq);
}
}
}
const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms)
{
return cms->contentType;
}
CMS_ContentInfo *ossl_cms_Data_create(OSSL_LIB_CTX *libctx, const char *propq)
{
CMS_ContentInfo *cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms != NULL) {
cms->contentType = OBJ_nid2obj(NID_pkcs7_data);
/* Never detached */
CMS_set_detached(cms, 0);
}
return cms;
}
BIO *ossl_cms_content_bio(CMS_ContentInfo *cms)
{
ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
if (pos == NULL)
return NULL;
/* If content detached data goes nowhere: create NULL BIO */
if (*pos == NULL)
return BIO_new(BIO_s_null());
/*
* If content not detached and created return memory BIO
*/
if (*pos == NULL || ((*pos)->flags == ASN1_STRING_FLAG_CONT))
return BIO_new(BIO_s_mem());
/* Else content was read in: return read only BIO for it */
return BIO_new_mem_buf((*pos)->data, (*pos)->length);
}
BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
{
BIO *cmsbio, *cont;
if (icont)
cont = icont;
else
cont = ossl_cms_content_bio(cms);
if (!cont) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
return NULL;
}
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_data:
return cont;
case NID_pkcs7_signed:
cmsbio = ossl_cms_SignedData_init_bio(cms);
break;
case NID_pkcs7_digest:
cmsbio = ossl_cms_DigestedData_init_bio(cms);
break;
#ifdef ZLIB
case NID_id_smime_ct_compressedData:
cmsbio = ossl_cms_CompressedData_init_bio(cms);
break;
#endif
case NID_pkcs7_encrypted:
cmsbio = ossl_cms_EncryptedData_init_bio(cms);
break;
case NID_pkcs7_enveloped:
cmsbio = ossl_cms_EnvelopedData_init_bio(cms);
break;
case NID_id_smime_ct_authEnvelopedData:
cmsbio = ossl_cms_AuthEnvelopedData_init_bio(cms);
break;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_TYPE);
goto err;
}
if (cmsbio)
return BIO_push(cmsbio, cont);
err:
if (!icont)
BIO_free(cont);
return NULL;
}
/* unfortunately cannot constify SMIME_write_ASN1() due to this function */
int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio)
{
return ossl_cms_DataFinal(cms, cmsbio, NULL, 0);
}
int ossl_cms_DataFinal(CMS_ContentInfo *cms, BIO *cmsbio,
const unsigned char *precomp_md,
unsigned int precomp_mdlen)
{
ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
if (pos == NULL)
return 0;
/* If embedded content find memory BIO and set content */
if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT)) {
BIO *mbio;
unsigned char *cont;
long contlen;
mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM);
if (!mbio) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_NOT_FOUND);
return 0;
}
contlen = BIO_get_mem_data(mbio, &cont);
/* Set bio as read only so its content can't be clobbered */
BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
BIO_set_mem_eof_return(mbio, 0);
ASN1_STRING_set0(*pos, cont, contlen);
(*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
}
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_data:
case NID_pkcs7_encrypted:
case NID_id_smime_ct_compressedData:
/* Nothing to do */
return 1;
case NID_pkcs7_enveloped:
return ossl_cms_EnvelopedData_final(cms, cmsbio);
case NID_id_smime_ct_authEnvelopedData:
return ossl_cms_AuthEnvelopedData_final(cms, cmsbio);
case NID_pkcs7_signed:
return ossl_cms_SignedData_final(cms, cmsbio, precomp_md, precomp_mdlen);
case NID_pkcs7_digest:
return ossl_cms_DigestedData_do_final(cms, cmsbio, 0);
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_TYPE);
return 0;
}
}
/*
* Return an OCTET STRING pointer to content. This allows it to be accessed
* or set later.
*/
ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms)
{
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_data:
return &cms->d.data;
case NID_pkcs7_signed:
return &cms->d.signedData->encapContentInfo->eContent;
case NID_pkcs7_enveloped:
return &cms->d.envelopedData->encryptedContentInfo->encryptedContent;
case NID_pkcs7_digest:
return &cms->d.digestedData->encapContentInfo->eContent;
case NID_pkcs7_encrypted:
return &cms->d.encryptedData->encryptedContentInfo->encryptedContent;
case NID_id_smime_ct_authEnvelopedData:
return &cms->d.authEnvelopedData->authEncryptedContentInfo
->encryptedContent;
case NID_id_smime_ct_authData:
return &cms->d.authenticatedData->encapContentInfo->eContent;
case NID_id_smime_ct_compressedData:
return &cms->d.compressedData->encapContentInfo->eContent;
default:
if (cms->d.other->type == V_ASN1_OCTET_STRING)
return &cms->d.other->value.octet_string;
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_TYPE);
return NULL;
}
}
/*
* Return an ASN1_OBJECT pointer to content type. This allows it to be
* accessed or set later.
*/
static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms)
{
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_signed:
return &cms->d.signedData->encapContentInfo->eContentType;
case NID_pkcs7_enveloped:
return &cms->d.envelopedData->encryptedContentInfo->contentType;
case NID_pkcs7_digest:
return &cms->d.digestedData->encapContentInfo->eContentType;
case NID_pkcs7_encrypted:
return &cms->d.encryptedData->encryptedContentInfo->contentType;
case NID_id_smime_ct_authEnvelopedData:
return &cms->d.authEnvelopedData->authEncryptedContentInfo
->contentType;
case NID_id_smime_ct_authData:
return &cms->d.authenticatedData->encapContentInfo->eContentType;
case NID_id_smime_ct_compressedData:
return &cms->d.compressedData->encapContentInfo->eContentType;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_TYPE);
return NULL;
}
}
const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms)
{
ASN1_OBJECT **petype;
petype = cms_get0_econtent_type(cms);
if (petype)
return *petype;
return NULL;
}
int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid)
{
ASN1_OBJECT **petype, *etype;
petype = cms_get0_econtent_type(cms);
if (petype == NULL)
return 0;
if (oid == NULL)
return 1;
etype = OBJ_dup(oid);
if (etype == NULL)
return 0;
ASN1_OBJECT_free(*petype);
*petype = etype;
return 1;
}
int CMS_is_detached(CMS_ContentInfo *cms)
{
ASN1_OCTET_STRING **pos;
pos = CMS_get0_content(cms);
if (pos == NULL)
return -1;
if (*pos != NULL)
return 0;
return 1;
}
int CMS_set_detached(CMS_ContentInfo *cms, int detached)
{
ASN1_OCTET_STRING **pos;
pos = CMS_get0_content(cms);
if (pos == NULL)
return 0;
if (detached) {
ASN1_OCTET_STRING_free(*pos);
*pos = NULL;
return 1;
}
if (*pos == NULL)
*pos = ASN1_OCTET_STRING_new();
if (*pos != NULL) {
/*
* NB: special flag to show content is created and not read in.
*/
(*pos)->flags |= ASN1_STRING_FLAG_CONT;
return 1;
}
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return 0;
}
/* Create a digest BIO from an X509_ALGOR structure */
BIO *ossl_cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm,
const CMS_CTX *ctx)
{
BIO *mdbio = NULL;
const ASN1_OBJECT *digestoid;
const EVP_MD *digest = NULL;
EVP_MD *fetched_digest = NULL;
char alg[OSSL_MAX_NAME_SIZE];
X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm);
OBJ_obj2txt(alg, sizeof(alg), digestoid, 0);
(void)ERR_set_mark();
fetched_digest = EVP_MD_fetch(ossl_cms_ctx_get0_libctx(ctx), alg,
ossl_cms_ctx_get0_propq(ctx));
if (fetched_digest != NULL)
digest = fetched_digest;
else
digest = EVP_get_digestbyobj(digestoid);
if (digest == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
goto err;
}
(void)ERR_pop_to_mark();
mdbio = BIO_new(BIO_f_md());
if (mdbio == NULL || !BIO_set_md(mdbio, digest)) {
ERR_raise(ERR_LIB_CMS, CMS_R_MD_BIO_INIT_ERROR);
goto err;
}
EVP_MD_free(fetched_digest);
return mdbio;
err:
EVP_MD_free(fetched_digest);
BIO_free(mdbio);
return NULL;
}
/* Locate a message digest content from a BIO chain based on SignerInfo */
int ossl_cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
X509_ALGOR *mdalg)
{
int nid;
const ASN1_OBJECT *mdoid;
X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg);
nid = OBJ_obj2nid(mdoid);
/* Look for digest type to match signature */
for (;;) {
EVP_MD_CTX *mtmp;
chain = BIO_find_type(chain, BIO_TYPE_MD);
if (chain == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_DIGEST);
return 0;
}
BIO_get_md_ctx(chain, &mtmp);
if (EVP_MD_CTX_get_type(mtmp) == nid
/*
* Workaround for broken implementations that use signature
* algorithm OID instead of digest.
*/
|| EVP_MD_get_pkey_type(EVP_MD_CTX_get0_md(mtmp)) == nid)
return EVP_MD_CTX_copy_ex(mctx, mtmp);
chain = BIO_next(chain);
}
}
static STACK_OF(CMS_CertificateChoices)
**cms_get0_certificate_choices(CMS_ContentInfo *cms)
{
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_signed:
return &cms->d.signedData->certificates;
case NID_pkcs7_enveloped:
if (cms->d.envelopedData->originatorInfo == NULL)
return NULL;
return &cms->d.envelopedData->originatorInfo->certificates;
case NID_id_smime_ct_authEnvelopedData:
if (cms->d.authEnvelopedData->originatorInfo == NULL)
return NULL;
return &cms->d.authEnvelopedData->originatorInfo->certificates;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_TYPE);
return NULL;
}
}
CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms)
{
STACK_OF(CMS_CertificateChoices) **pcerts;
CMS_CertificateChoices *cch;
pcerts = cms_get0_certificate_choices(cms);
if (pcerts == NULL)
return NULL;
if (*pcerts == NULL)
*pcerts = sk_CMS_CertificateChoices_new_null();
if (*pcerts == NULL)
return NULL;
cch = M_ASN1_new_of(CMS_CertificateChoices);
if (!cch)
return NULL;
if (!sk_CMS_CertificateChoices_push(*pcerts, cch)) {
M_ASN1_free_of(cch, CMS_CertificateChoices);
return NULL;
}
return cch;
}
int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert)
{
CMS_CertificateChoices *cch;
STACK_OF(CMS_CertificateChoices) **pcerts;
int i;
pcerts = cms_get0_certificate_choices(cms);
if (pcerts == NULL)
return 0;
for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) {
cch = sk_CMS_CertificateChoices_value(*pcerts, i);
if (cch->type == CMS_CERTCHOICE_CERT) {
if (!X509_cmp(cch->d.certificate, cert)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CERTIFICATE_ALREADY_PRESENT);
return 0;
}
}
}
cch = CMS_add0_CertificateChoices(cms);
if (!cch)
return 0;
cch->type = CMS_CERTCHOICE_CERT;
cch->d.certificate = cert;
return 1;
}
int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert)
{
int r;
r = CMS_add0_cert(cms, cert);
if (r > 0)
X509_up_ref(cert);
return r;
}
static STACK_OF(CMS_RevocationInfoChoice)
**cms_get0_revocation_choices(CMS_ContentInfo *cms)
{
switch (OBJ_obj2nid(cms->contentType)) {
case NID_pkcs7_signed:
return &cms->d.signedData->crls;
case NID_pkcs7_enveloped:
if (cms->d.envelopedData->originatorInfo == NULL)
return NULL;
return &cms->d.envelopedData->originatorInfo->crls;
case NID_id_smime_ct_authEnvelopedData:
if (cms->d.authEnvelopedData->originatorInfo == NULL)
return NULL;
return &cms->d.authEnvelopedData->originatorInfo->crls;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_TYPE);
return NULL;
}
}
CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms)
{
STACK_OF(CMS_RevocationInfoChoice) **pcrls;
CMS_RevocationInfoChoice *rch;
pcrls = cms_get0_revocation_choices(cms);
if (pcrls == NULL)
return NULL;
if (*pcrls == NULL)
*pcrls = sk_CMS_RevocationInfoChoice_new_null();
if (*pcrls == NULL)
return NULL;
rch = M_ASN1_new_of(CMS_RevocationInfoChoice);
if (rch == NULL)
return NULL;
if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch)) {
M_ASN1_free_of(rch, CMS_RevocationInfoChoice);
return NULL;
}
return rch;
}
int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl)
{
CMS_RevocationInfoChoice *rch;
rch = CMS_add0_RevocationInfoChoice(cms);
if (!rch)
return 0;
rch->type = CMS_REVCHOICE_CRL;
rch->d.crl = crl;
return 1;
}
int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl)
{
int r;
r = CMS_add0_crl(cms, crl);
if (r > 0)
X509_CRL_up_ref(crl);
return r;
}
STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms)
{
STACK_OF(X509) *certs = NULL;
CMS_CertificateChoices *cch;
STACK_OF(CMS_CertificateChoices) **pcerts;
int i;
pcerts = cms_get0_certificate_choices(cms);
if (pcerts == NULL)
return NULL;
for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) {
cch = sk_CMS_CertificateChoices_value(*pcerts, i);
if (cch->type == 0) {
if (!ossl_x509_add_cert_new(&certs, cch->d.certificate,
X509_ADD_FLAG_UP_REF)) {
OSSL_STACK_OF_X509_free(certs);
return NULL;
}
}
}
return certs;
}
STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms)
{
STACK_OF(X509_CRL) *crls = NULL;
STACK_OF(CMS_RevocationInfoChoice) **pcrls;
CMS_RevocationInfoChoice *rch;
int i;
pcrls = cms_get0_revocation_choices(cms);
if (pcrls == NULL)
return NULL;
for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++) {
rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i);
if (rch->type == 0) {
if (!crls) {
crls = sk_X509_CRL_new_null();
if (!crls)
return NULL;
}
if (!sk_X509_CRL_push(crls, rch->d.crl)) {
sk_X509_CRL_pop_free(crls, X509_CRL_free);
return NULL;
}
X509_CRL_up_ref(rch->d.crl);
}
}
return crls;
}
int ossl_cms_ias_cert_cmp(CMS_IssuerAndSerialNumber *ias, X509 *cert)
{
int ret;
ret = X509_NAME_cmp(ias->issuer, X509_get_issuer_name(cert));
if (ret)
return ret;
return ASN1_INTEGER_cmp(ias->serialNumber, X509_get0_serialNumber(cert));
}
int ossl_cms_keyid_cert_cmp(ASN1_OCTET_STRING *keyid, X509 *cert)
{
const ASN1_OCTET_STRING *cert_keyid = X509_get0_subject_key_id(cert);
if (cert_keyid == NULL)
return -1;
return ASN1_OCTET_STRING_cmp(keyid, cert_keyid);
}
int ossl_cms_set1_ias(CMS_IssuerAndSerialNumber **pias, X509 *cert)
{
CMS_IssuerAndSerialNumber *ias;
ias = M_ASN1_new_of(CMS_IssuerAndSerialNumber);
if (!ias)
goto err;
if (!X509_NAME_set(&ias->issuer, X509_get_issuer_name(cert)))
goto err;
if (!ASN1_STRING_copy(ias->serialNumber, X509_get0_serialNumber(cert)))
goto err;
M_ASN1_free_of(*pias, CMS_IssuerAndSerialNumber);
*pias = ias;
return 1;
err:
M_ASN1_free_of(ias, CMS_IssuerAndSerialNumber);
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return 0;
}
int ossl_cms_set1_keyid(ASN1_OCTET_STRING **pkeyid, X509 *cert)
{
ASN1_OCTET_STRING *keyid = NULL;
const ASN1_OCTET_STRING *cert_keyid;
cert_keyid = X509_get0_subject_key_id(cert);
if (cert_keyid == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_CERTIFICATE_HAS_NO_KEYID);
return 0;
}
keyid = ASN1_STRING_dup(cert_keyid);
if (!keyid) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return 0;
}
ASN1_OCTET_STRING_free(*pkeyid);
*pkeyid = keyid;
return 1;
}
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