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pk7_lib.c
/* crypto/pkcs7/pk7_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/objects.h>
#include <openssl/x509.h>
#include "asn1_locl.h"

long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
      {
      int nid;
      long ret;

      nid=OBJ_obj2nid(p7->type);

      switch (cmd)
            {
      case PKCS7_OP_SET_DETACHED_SIGNATURE:
            if (nid == NID_pkcs7_signed)
                  {
                  ret=p7->detached=(int)larg;
                  if (ret && PKCS7_type_is_data(p7->d.sign->contents))
                              {
                              ASN1_OCTET_STRING *os;
                              os=p7->d.sign->contents->d.data;
                              ASN1_OCTET_STRING_free(os);
                              p7->d.sign->contents->d.data = NULL;
                              }
                  }
            else
                  {
                  PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
                  ret=0;
                  }
            break;
      case PKCS7_OP_GET_DETACHED_SIGNATURE:
            if (nid == NID_pkcs7_signed)
                  {
                  if(!p7->d.sign  || !p7->d.sign->contents->d.ptr)
                        ret = 1;
                  else ret = 0;
                        
                  p7->detached = ret;
                  }
            else
                  {
                  PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
                  ret=0;
                  }
                  
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_UNKNOWN_OPERATION);
            ret=0;
            }
      return(ret);
      }

int PKCS7_content_new(PKCS7 *p7, int type)
      {
      PKCS7 *ret=NULL;

      if ((ret=PKCS7_new()) == NULL) goto err;
      if (!PKCS7_set_type(ret,type)) goto err;
      if (!PKCS7_set_content(p7,ret)) goto err;

      return(1);
err:
      if (ret != NULL) PKCS7_free(ret);
      return(0);
      }

int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
      {
      int i;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signed:
            if (p7->d.sign->contents != NULL)
                  PKCS7_free(p7->d.sign->contents);
            p7->d.sign->contents=p7_data;
            break;
      case NID_pkcs7_digest:
            if (p7->d.digest->contents != NULL)
                  PKCS7_free(p7->d.digest->contents);
            p7->d.digest->contents=p7_data;
            break;
      case NID_pkcs7_data:
      case NID_pkcs7_enveloped:
      case NID_pkcs7_signedAndEnveloped:
      case NID_pkcs7_encrypted:
      default:
            PKCS7err(PKCS7_F_PKCS7_SET_CONTENT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
            goto err;
            }
      return(1);
err:
      return(0);
      }

int PKCS7_set_type(PKCS7 *p7, int type)
      {
      ASN1_OBJECT *obj;

      /*PKCS7_content_free(p7);*/
      obj=OBJ_nid2obj(type); /* will not fail */

      switch (type)
            {
      case NID_pkcs7_signed:
            p7->type=obj;
            if ((p7->d.sign=PKCS7_SIGNED_new()) == NULL)
                  goto err;
            if (!ASN1_INTEGER_set(p7->d.sign->version,1))
                  {
                  PKCS7_SIGNED_free(p7->d.sign);
                  p7->d.sign=NULL;
                  goto err;
                  }
            break;
      case NID_pkcs7_data:
            p7->type=obj;
            if ((p7->d.data=M_ASN1_OCTET_STRING_new()) == NULL)
                  goto err;
            break;
      case NID_pkcs7_signedAndEnveloped:
            p7->type=obj;
            if ((p7->d.signed_and_enveloped=PKCS7_SIGN_ENVELOPE_new())
                  == NULL) goto err;
            ASN1_INTEGER_set(p7->d.signed_and_enveloped->version,1);
            if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version,1))
                  goto err;
            p7->d.signed_and_enveloped->enc_data->content_type
                                    = OBJ_nid2obj(NID_pkcs7_data);
            break;
      case NID_pkcs7_enveloped:
            p7->type=obj;
            if ((p7->d.enveloped=PKCS7_ENVELOPE_new())
                  == NULL) goto err;
            if (!ASN1_INTEGER_set(p7->d.enveloped->version,0))
                  goto err;
            p7->d.enveloped->enc_data->content_type
                                    = OBJ_nid2obj(NID_pkcs7_data);
            break;
      case NID_pkcs7_encrypted:
            p7->type=obj;
            if ((p7->d.encrypted=PKCS7_ENCRYPT_new())
                  == NULL) goto err;
            if (!ASN1_INTEGER_set(p7->d.encrypted->version,0))
                  goto err;
            p7->d.encrypted->enc_data->content_type
                                    = OBJ_nid2obj(NID_pkcs7_data);
            break;

      case NID_pkcs7_digest:
            p7->type=obj;
            if ((p7->d.digest=PKCS7_DIGEST_new())
                  == NULL) goto err;
            if (!ASN1_INTEGER_set(p7->d.digest->version,0))
                  goto err;
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_SET_TYPE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
            goto err;
            }
      return(1);
err:
      return(0);
      }

int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
      {
      p7->type = OBJ_nid2obj(type);
      p7->d.other = other;
      return 1;
      }

int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
      {
      int i,j,nid;
      X509_ALGOR *alg;
      STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
      STACK_OF(X509_ALGOR) *md_sk;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signed:
            signer_sk=  p7->d.sign->signer_info;
            md_sk=            p7->d.sign->md_algs;
            break;
      case NID_pkcs7_signedAndEnveloped:
            signer_sk=  p7->d.signed_and_enveloped->signer_info;
            md_sk=            p7->d.signed_and_enveloped->md_algs;
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,PKCS7_R_WRONG_CONTENT_TYPE);
            return(0);
            }

      nid=OBJ_obj2nid(psi->digest_alg->algorithm);

      /* If the digest is not currently listed, add it */
      j=0;
      for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
            {
            alg=sk_X509_ALGOR_value(md_sk,i);
            if (OBJ_obj2nid(alg->algorithm) == nid)
                  {
                  j=1;
                  break;
                  }
            }
      if (!j) /* we need to add another algorithm */
            {
            if(!(alg=X509_ALGOR_new())
                  || !(alg->parameter = ASN1_TYPE_new()))
                  {
                  X509_ALGOR_free(alg);
                  PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,ERR_R_MALLOC_FAILURE);
                  return(0);
                  }
            alg->algorithm=OBJ_nid2obj(nid);
            alg->parameter->type = V_ASN1_NULL;
            if (!sk_X509_ALGOR_push(md_sk,alg))
                  {
                  X509_ALGOR_free(alg);
                  return 0;
                  }
            }

      if (!sk_PKCS7_SIGNER_INFO_push(signer_sk,psi))
            return 0;
      return(1);
      }

int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
      {
      int i;
      STACK_OF(X509) **sk;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signed:
            sk= &(p7->d.sign->cert);
            break;
      case NID_pkcs7_signedAndEnveloped:
            sk= &(p7->d.signed_and_enveloped->cert);
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE,PKCS7_R_WRONG_CONTENT_TYPE);
            return(0);
            }

      if (*sk == NULL)
            *sk=sk_X509_new_null();
      if (*sk == NULL)
            {
            PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
      if (!sk_X509_push(*sk,x509))
            {
            X509_free(x509);
            return 0;
            }
      return(1);
      }

int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
      {
      int i;
      STACK_OF(X509_CRL) **sk;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signed:
            sk= &(p7->d.sign->crl);
            break;
      case NID_pkcs7_signedAndEnveloped:
            sk= &(p7->d.signed_and_enveloped->crl);
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_ADD_CRL,PKCS7_R_WRONG_CONTENT_TYPE);
            return(0);
            }

      if (*sk == NULL)
            *sk=sk_X509_CRL_new_null();
      if (*sk == NULL)
            {
            PKCS7err(PKCS7_F_PKCS7_ADD_CRL,ERR_R_MALLOC_FAILURE);
            return 0;
            }

      CRYPTO_add(&crl->references,1,CRYPTO_LOCK_X509_CRL);
      if (!sk_X509_CRL_push(*sk,crl))
            {
            X509_CRL_free(crl);
            return 0;
            }
      return(1);
      }

int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
           const EVP_MD *dgst)
      {
      int ret;

      /* We now need to add another PKCS7_SIGNER_INFO entry */
      if (!ASN1_INTEGER_set(p7i->version,1))
            goto err;
      if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
                  X509_get_issuer_name(x509)))
            goto err;

      /* because ASN1_INTEGER_set is used to set a 'long' we will do
       * things the ugly way. */
      M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
      if (!(p7i->issuer_and_serial->serial=
                  M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
            goto err;

      /* lets keep the pkey around for a while */
      CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
      p7i->pkey=pkey;

      /* Set the algorithms */

      X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
                        V_ASN1_NULL, NULL);

      if (pkey->ameth && pkey->ameth->pkey_ctrl)
            {
            ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN,
                                    0, p7i);
            if (ret > 0)
                  return 1;
            if (ret != -2)
                  {
                  PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
                              PKCS7_R_SIGNING_CTRL_FAILURE);
                  return 0;
                  }
            }
      PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
                  PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
err:
      return 0;
      }

PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
           const EVP_MD *dgst)
      {
      PKCS7_SIGNER_INFO *si = NULL;

      if (dgst == NULL)
            {
            int def_nid;
            if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
                  goto err;
            dgst = EVP_get_digestbynid(def_nid);
            if (dgst == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE,
                                    PKCS7_R_NO_DEFAULT_DIGEST);
                  goto err;
                  }
            }

      if ((si=PKCS7_SIGNER_INFO_new()) == NULL) goto err;
      if (!PKCS7_SIGNER_INFO_set(si,x509,pkey,dgst)) goto err;
      if (!PKCS7_add_signer(p7,si)) goto err;
      return(si);
err:
      if (si)
            PKCS7_SIGNER_INFO_free(si);
      return(NULL);
      }

int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
      {
      if (PKCS7_type_is_digest(p7))
            {
            if(!(p7->d.digest->md->parameter = ASN1_TYPE_new()))
                  {
                  PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            p7->d.digest->md->parameter->type = V_ASN1_NULL;
            p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
            return 1;
            }
            
      PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,PKCS7_R_WRONG_CONTENT_TYPE);
      return 1;
      }

STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
      {
      if (PKCS7_type_is_signed(p7))
            {
            return(p7->d.sign->signer_info);
            }
      else if (PKCS7_type_is_signedAndEnveloped(p7))
            {
            return(p7->d.signed_and_enveloped->signer_info);
            }
      else
            return(NULL);
      }

void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
                              X509_ALGOR **pdig, X509_ALGOR **psig)
      {
      if (pk)
            *pk = si->pkey;
      if (pdig)
            *pdig = si->digest_alg;
      if (psig)
            *psig = si->digest_enc_alg;
      }

void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
      {
      if (penc)
            *penc = ri->key_enc_algor;
      }

PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
      {
      PKCS7_RECIP_INFO *ri;

      if ((ri=PKCS7_RECIP_INFO_new()) == NULL) goto err;
      if (!PKCS7_RECIP_INFO_set(ri,x509)) goto err;
      if (!PKCS7_add_recipient_info(p7,ri)) goto err;
      return ri;
err:
      if (ri)
            PKCS7_RECIP_INFO_free(ri);
      return NULL;
      }

int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
      {
      int i;
      STACK_OF(PKCS7_RECIP_INFO) *sk;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signedAndEnveloped:
            sk=   p7->d.signed_and_enveloped->recipientinfo;
            break;
      case NID_pkcs7_enveloped:
            sk=   p7->d.enveloped->recipientinfo;
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,PKCS7_R_WRONG_CONTENT_TYPE);
            return(0);
            }

      if (!sk_PKCS7_RECIP_INFO_push(sk,ri))
            return 0;
      return(1);
      }

int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
      {
      int ret;
      EVP_PKEY *pkey = NULL;
      if (!ASN1_INTEGER_set(p7i->version,0))
            return 0;
      if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
            X509_get_issuer_name(x509)))
            return 0;

      M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
      if (!(p7i->issuer_and_serial->serial=
            M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
            return 0;

      pkey = X509_get_pubkey(x509);

      if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl)
            {
            PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
                  PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
            goto err;
            }

      ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT,
                                    0, p7i);
      if (ret == -2)
            {
            PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
                  PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
            goto err;
            }
      if (ret <= 0)
            {
            PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
                        PKCS7_R_ENCRYPTION_CTRL_FAILURE);
            goto err;
            }

      EVP_PKEY_free(pkey);

      CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
      p7i->cert=x509;

      return 1;

      err:
      if (pkey)
            EVP_PKEY_free(pkey);
      return 0;
      }

X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
      {
      if (PKCS7_type_is_signed(p7))
            return(X509_find_by_issuer_and_serial(p7->d.sign->cert,
                  si->issuer_and_serial->issuer,
                  si->issuer_and_serial->serial));
      else
            return(NULL);
      }

int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
      {
      int i;
      PKCS7_ENC_CONTENT *ec;

      i=OBJ_obj2nid(p7->type);
      switch (i)
            {
      case NID_pkcs7_signedAndEnveloped:
            ec=p7->d.signed_and_enveloped->enc_data;
            break;
      case NID_pkcs7_enveloped:
            ec=p7->d.enveloped->enc_data;
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_WRONG_CONTENT_TYPE);
            return(0);
            }

      /* Check cipher OID exists and has data in it*/
      i = EVP_CIPHER_type(cipher);
      if(i == NID_undef) {
            PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
            return(0);
      }

      ec->cipher = cipher;
      return 1;
      }

int PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
      {
      ASN1_OCTET_STRING *os = NULL;

      switch (OBJ_obj2nid(p7->type))
            {
            case NID_pkcs7_data:
            os = p7->d.data;
            break;

            case NID_pkcs7_signedAndEnveloped:
            os = p7->d.signed_and_enveloped->enc_data->enc_data;
            if (os == NULL)
                  {
                  os=M_ASN1_OCTET_STRING_new();
                  p7->d.signed_and_enveloped->enc_data->enc_data=os;
                  }
            break;

            case NID_pkcs7_enveloped:
            os = p7->d.enveloped->enc_data->enc_data;
            if (os == NULL)
                  {
                  os=M_ASN1_OCTET_STRING_new();
                  p7->d.enveloped->enc_data->enc_data=os;
                  }
            break;

            case NID_pkcs7_signed:
            os=p7->d.sign->contents->d.data;
            break;

            default:
            os = NULL;
            break;
            }
      
      if (os == NULL)
            return 0;

      os->flags |= ASN1_STRING_FLAG_NDEF;
      *boundary = &os->data;

      return 1;
      }

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