/src/libressl/crypto/cms/cms_sd.c

Source (jump to first uncovered line)
/* $OpenBSD: cms_sd.c,v 1.23 2019/08/11 14:35:57 jsing Exp $ */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include <string.h>

#include "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 "cms_lcl.h"
#include "asn1/asn1_locl.h"
#include "evp/evp_locl.h"

/* CMS SignedData Utilities */

static CMS_SignedData *
cms_get0_signed(CMS_ContentInfo *cms)
{
  if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
    CMSerror(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 = (CMS_SignedData *)ASN1_item_new(&CMS_SignedData_it);
    if (!cms->d.signedData) {
      CMSerror(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;
}

/* 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) {
      CMSerror(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;
  }

  CMSerror(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:
    CMSerror(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 || !pkey->ameth->pkey_ctrl)
    return 1;
  i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
  if (i == -2) {
    CMSerror(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
    return 0;
  }
  if (i <= 0) {
    CMSerror(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)) {
    CMSerror(CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
    return NULL;
  }
  sd = cms_signed_data_init(cms);
  if (!sd)
    goto err;
  si = (CMS_SignerInfo *)ASN1_item_new(&CMS_SignerInfo_it);
  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) {
    CMSerror(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) {
      CMSerror(CMS_R_NO_DEFAULT_DIGEST);
      goto err;
    }
  }

  if (!md) {
    CMSerror(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_REUSE_DIGEST) {
      if (!cms_copy_messageDigest(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:
  CMSerror(ERR_R_MALLOC_FAILURE);
 err:
  ASN1_item_free((ASN1_VALUE *)si, &CMS_SignerInfo_it);

  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)
    CMSerror(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) {
    CMSerror(ERR_R_MALLOC_FAILURE);
    return 0;
  }

  if (!si->pkey) {
    CMSerror(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) {
    ASN1_OBJECT *ctype =
        cms->d.signedData->encapContentInfo->eContentType;
    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_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
        V_ASN1_OBJECT, ctype, -1) <= 0)
      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 = malloc(siglen);
    if (sig == NULL) {
      CMSerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
      free(sig);
      goto err;
    }
    ASN1_STRING_set0(si->signature, sig, siglen);
  } else {
    unsigned char *sig;
    unsigned int siglen;

    sig = malloc(EVP_PKEY_size(si->pkey));
    if (sig == NULL) {
      CMSerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
      CMSerror(CMS_R_SIGNFINAL_ERROR);
      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 (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;
  }

  if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
      EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
    CMSerror(CMS_R_CTRL_ERROR);
    goto err;
  }

  alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
      &CMS_Attributes_Sign_it);
  if (!abuf)
    goto err;
  if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
    goto err;
  if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
    goto err;
  free(abuf);
  abuf = malloc(siglen);
  if (abuf == NULL)
    goto err;
  if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
    goto err;

  if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
      EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
    CMSerror(CMS_R_CTRL_ERROR);
    goto err;
  }

  EVP_MD_CTX_reset(mctx);

  ASN1_STRING_set0(si->signature, abuf, siglen);

  return 1;

 err:
  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) {
    CMSerror(CMS_R_NO_PUBLIC_KEY);
    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) {
    CMSerror(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,
      &CMS_Attributes_Verify_it);
  if (!abuf)
    goto err;
  r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
  free(abuf);
  if (r <= 0) {
    r = -1;
    goto err;
  }

  r = EVP_DigestVerifyFinal(mctx, si->signature->data,
      si->signature->length);
  if (r <= 0)
    CMSerror(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) {
    CMSerror(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) {
      CMSerror(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) {
    CMSerror(CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
    goto err;
  }

  /* If messageDigest found compare it */

  if (os) {
    if (mlen != (unsigned int)os->length) {
      CMSerror(CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
      goto err;
    }

    if (memcmp(mval, os->data, mlen)) {
      CMSerror(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) {
      CMSerror(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);
  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_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;
}

Coverage Report

Created: 2022-08-24 06:30