cms_sd.c

OpenSSL 0.9.8k 最新版OpenSSL

	}

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)
		{
		CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
		if (si->pkey)
			EVP_PKEY_free(si->pkey);
		si->pkey = X509_get_pubkey(signer);
		}
	if (si->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;
	}

/* In OpenSSL 0.9.8 we have the link between digest types and public
 * key types so we need to fixup the digest type if the public key
 * type is not appropriate.
 */

static void cms_fixup_mctx(EVP_MD_CTX *mctx, EVP_PKEY *pkey)
	{
	if (EVP_MD_CTX_type(mctx) != NID_sha1)
		return;
#ifndef OPENSSL_NO_DSA
	if (pkey->type == EVP_PKEY_DSA)
		mctx->digest = EVP_dss1();	
#endif
#ifndef OPENSSL_NO_ECDSA
	if (pkey->type == EVP_PKEY_EC)
		mctx->digest = EVP_ecdsa();	
#endif
	}

static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
					CMS_SignerInfo *si, BIO *chain)
	{
	EVP_MD_CTX mctx;
	int r = 0;
	EVP_MD_CTX_init(&mctx);


	if (!si->pkey)
		{
		CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
		return 0;
		}

	if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
		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;
		EVP_DigestFinal_ex(&mctx, md, &mdlen);
		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
		{
		unsigned char *sig;
		unsigned int siglen;
		sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
		if (!sig)
			{
			CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
					ERR_R_MALLOC_FAILURE);
			goto err;
			}
		cms_fixup_mctx(&mctx, si->pkey);
		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_cleanup(&mctx);
	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;
	unsigned char *abuf = NULL;
	int alen;
	unsigned int siglen;
	const EVP_MD *md = NULL;

	md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
	if (md == NULL)
		return 0;

	EVP_MD_CTX_init(&mctx);

	if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
		{
		if (!cms_add1_signingTime(si, NULL))
			goto err;
		}

	if (EVP_SignInit_ex(&mctx, md, NULL) <= 0)
		goto err;

#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_SignUpdate(&mctx, abuf, alen) <= 0)
		goto err;
	siglen = EVP_PKEY_size(si->pkey);
	OPENSSL_free(abuf);
	abuf = OPENSSL_malloc(siglen);
	if(!abuf)
		goto err;
	cms_fixup_mctx(&mctx, si->pkey);
	if (EVP_SignFinal(&mctx, abuf, &siglen, si->pkey) <= 0)
		goto err;
#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_cleanup(&mctx);

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

	return 1;

	err:
	if (abuf)
		OPENSSL_free(abuf);
	EVP_MD_CTX_cleanup(&mctx);
	return 0;

	}

int CMS_SignerInfo_verify(CMS_SignerInfo *si)
	{
	EVP_MD_CTX mctx;
	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;
		}

	md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
	if (md == NULL)
		return -1;
	EVP_MD_CTX_init(&mctx);
	if (EVP_VerifyInit_ex(&mctx, md, NULL) <= 0)
		goto err;

	alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
				ASN1_ITEM_rptr(CMS_Attributes_Verify));
	if(!abuf)
		goto err;
	r = EVP_VerifyUpdate(&mctx, abuf, alen);
	OPENSSL_free(abuf);
	if (r <= 0)
		{
		r = -1;
		goto err;
		}
	cms_fixup_mctx(&mctx, si->pkey);
	r = EVP_VerifyFinal(&mctx,
			si->signature->data, si->signature->length, si->pkey);
	if (r <= 0)
		CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
	err:
	EVP_MD_CTX_cleanup(&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:
	if (chain)
		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;
	int r = -1;
	EVP_MD_CTX_init(&mctx);
	/* 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 messageDigest found compare it */

	if (os)
		{
		unsigned char mval[EVP_MAX_MD_SIZE];
		unsigned int mlen;
		if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
			{
			CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
				CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
			goto err;
			}
		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
		{
		cms_fixup_mctx(&mctx, si->pkey);
		r = EVP_VerifyFinal(&mctx, si->signature->data,
					si->signature->length, si->pkey);
		if (r <= 0)
			{
			CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
				CMS_R_VERIFICATION_FAILURE);
			r = 0;
			}
		}

	err:
	EVP_MD_CTX_cleanup(&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 || !ASN1_INTEGER_set(key, keysize))
			return 0;
		}
	alg = X509_ALGOR_new();
	if (!alg)
		{
		if (key)
			ASN1_INTEGER_free(key);
		return 0;
		}
		
	X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
				key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
	if (!*algs)
		*algs = sk_X509_ALGOR_new_null();
	if (!*algs || !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;
	}
#if 0
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;
	}
#endif
int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
	{
	if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -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;
	}