pk7_doit.c

来自「openssl是ssl的开源项目」· C语言 代码 · 共 941 行 · 第 1/2 页

PKCS7 *p7;
BIO *bio;
	{
	int ret=0;
	int i,j;
	BIO *btmp;
	BUF_MEM *buf_mem=NULL;
	BUF_MEM *buf=NULL;
	PKCS7_SIGNER_INFO *si;
	EVP_MD_CTX *mdc,ctx_tmp;
	STACK *sk,*si_sk=NULL;
	unsigned char *p,*pp=NULL;
	int x;
	ASN1_OCTET_STRING *os=NULL;

	i=OBJ_obj2nid(p7->type);
	p7->state=PKCS7_S_HEADER;

	switch (i)
		{
	case NID_pkcs7_signedAndEnveloped:
		/* XXXXXXXXXXXXXXXX */
		si_sk=p7->d.signed_and_enveloped->signer_info;
		os=ASN1_OCTET_STRING_new();
		p7->d.signed_and_enveloped->enc_data->enc_data=os;
		break;
	case NID_pkcs7_enveloped:
		/* XXXXXXXXXXXXXXXX */
		os=ASN1_OCTET_STRING_new();
		p7->d.enveloped->enc_data->enc_data=os;
		break;
	case NID_pkcs7_signed:
		si_sk=p7->d.sign->signer_info;
		os=p7->d.sign->contents->d.data;
		break;
		}

	if (si_sk != NULL)
		{
		if ((buf=BUF_MEM_new()) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
			goto err;
			}
		for (i=0; i<sk_num(si_sk); i++)
			{
			si=(PKCS7_SIGNER_INFO *)
				sk_value(si_sk,i);
			if (si->pkey == NULL) continue;

			j=OBJ_obj2nid(si->digest_alg->algorithm);

			btmp=bio;
			for (;;)
				{
				if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
					== NULL)
					{
					PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
					goto err;
					}
				BIO_get_md_ctx(btmp,&mdc);
				if (mdc == NULL)
					{
					PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
					goto err;
					}
				if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
					break;
				else
					btmp=btmp->next_bio;
				}
			
			/* We now have the EVP_MD_CTX, lets do the
			 * signing. */
			memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
			if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
				{
				PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
				goto err;
				}

			sk=si->auth_attr;

			/* If there are attributes, we add the digest
			 * attribute and only sign the attributes */
			if ((sk != NULL) && (sk_num(sk) != 0))
				{
				unsigned char md_data[EVP_MAX_MD_SIZE];
				unsigned int md_len;
				ASN1_OCTET_STRING *digest;
				ASN1_UTCTIME *sign_time;
				EVP_MD *md_tmp;

				/* Add signing time */
				sign_time=X509_gmtime_adj(NULL,0);
				PKCS7_add_signed_attribute(si,
					NID_pkcs9_signingTime,
					V_ASN1_UTCTIME,(char *)sign_time);

				/* Add digest */
				md_tmp=EVP_MD_CTX_type(&ctx_tmp);
				EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
				digest=ASN1_OCTET_STRING_new();
				ASN1_OCTET_STRING_set(digest,md_data,md_len);
				PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
					V_ASN1_OCTET_STRING,(char *)digest);

				/* Now sign the mess */
				EVP_SignInit(&ctx_tmp,md_tmp);
				x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
					V_ASN1_SET,V_ASN1_UNIVERSAL);
				pp=(unsigned char *)Malloc(x);
				p=pp;
				i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
					V_ASN1_SET,V_ASN1_UNIVERSAL);
				EVP_SignUpdate(&ctx_tmp,pp,x);
				Free(pp);
				pp=NULL;
				}

			if (si->pkey->type == EVP_PKEY_DSA)
				ctx_tmp.digest=EVP_dss1();

			if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
				(unsigned int *)&buf->length,si->pkey))
				{
				PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
				goto err;
				}
			if (!ASN1_STRING_set(si->enc_digest,
				(unsigned char *)buf->data,buf->length))
				{
				PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
				goto err;
				}
			}
		}

	if (p7->detached)
		ASN1_OCTET_STRING_set(os,(unsigned char *)"",0);
	else
		{
		btmp=BIO_find_type(bio,BIO_TYPE_MEM);
		if (btmp == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
			goto err;
			}
		BIO_get_mem_ptr(btmp,&buf_mem);
		ASN1_OCTET_STRING_set(os,
			(unsigned char *)buf_mem->data,buf_mem->length);
		}
	if (pp != NULL) Free(pp);
	pp=NULL;

	ret=1;
err:
	if (buf != NULL) BUF_MEM_free(buf);
	return(ret);
	}

int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
X509_STORE *cert_store;
X509_STORE_CTX *ctx;
BIO *bio;
PKCS7 *p7;
PKCS7_SIGNER_INFO *si;
	{
/*	PKCS7_SIGNED *s; */
	ASN1_OCTET_STRING *os;
	EVP_MD_CTX mdc_tmp,*mdc;
	unsigned char *pp,*p;
	PKCS7_ISSUER_AND_SERIAL *ias;
	int ret=0,i;
	int md_type;
	STACK *sk,*cert;
	BIO *btmp;
	X509 *x509;

	if (PKCS7_type_is_signed(p7))
		{
		cert=p7->d.sign->cert;
		}
	else if (PKCS7_type_is_signedAndEnveloped(p7))
		{
		cert=p7->d.signed_and_enveloped->cert;
		}
	else
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
		goto err;
		}
	/* XXXXXXXXXXXXXXXXXXXXXXX */
	ias=si->issuer_and_serial;

	x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);

	/* were we able to find the cert in passed to us */
	if (x509 == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
		goto err;
		}

	/* Lets verify */
	X509_STORE_CTX_init(ctx,cert_store,x509,cert);
	i=X509_verify_cert(ctx);
	if (i <= 0) 
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
		goto err;
		}
	X509_STORE_CTX_cleanup(ctx);

	/* So we like 'x509', lets check the signature. */
	md_type=OBJ_obj2nid(si->digest_alg->algorithm);

	btmp=bio;
	for (;;)
		{
		if ((btmp == NULL) ||
			((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
			{
			PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
			goto err;
			}
		BIO_get_md_ctx(btmp,&mdc);
		if (mdc == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
			goto err;
			}
		if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
			break;
		btmp=btmp->next_bio;	
		}

	/* mdc is the digest ctx that we want, unless there are attributes,
	 * in which case the digest is the signed attributes */
	memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));

	sk=si->auth_attr;
	if ((sk != NULL) && (sk_num(sk) != 0))
		{
		unsigned char md_dat[EVP_MAX_MD_SIZE];
		int md_len;
		ASN1_OCTET_STRING *message_digest;

		EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
		message_digest=PKCS7_digest_from_attributes(sk);
		if (!message_digest)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
			goto err;
			}
		if ((message_digest->length != md_len) ||
			(memcmp(message_digest->data,md_dat,md_len)))
			{
#if 0
{
int ii;
for (ii=0; ii<message_digest->length; ii++)
	printf("%02X",message_digest->data[ii]); printf(" sent\n");
for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
}
#endif
			PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
			ret= -1;
			goto err;
			}

		EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
		i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
			V_ASN1_SET,V_ASN1_UNIVERSAL);
		pp=(unsigned char *)Malloc(i);
		p=pp;
		i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
			V_ASN1_SET,V_ASN1_UNIVERSAL);
		EVP_VerifyUpdate(&mdc_tmp,pp,i);
		Free(pp);
		}

	os=si->enc_digest;
	if (X509_get_pubkey(x509)->type == EVP_PKEY_DSA)
		mdc_tmp.digest=EVP_dss1();

	i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
		X509_get_pubkey(x509));
	if (i <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
		ret= -1;
		goto err;
		}
	else
		ret=1;
err:
	return(ret);
	}

PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(p7,idx)
PKCS7 *p7;
int idx;
	{
	STACK *rsk;
	PKCS7_RECIP_INFO *ri;
	int i;

	i=OBJ_obj2nid(p7->type);
	if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
	rsk=p7->d.signed_and_enveloped->recipientinfo;
	ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
	if (sk_num(rsk) <= idx) return(NULL);
	ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
	return(ri->issuer_and_serial);
	}

ASN1_TYPE *PKCS7_get_signed_attribute(si,nid)
PKCS7_SIGNER_INFO *si;
int nid;
	{
	return(get_attribute(si->auth_attr,nid));
	}

ASN1_TYPE *PKCS7_get_attribute(si,nid)
PKCS7_SIGNER_INFO *si;
int nid;
	{
	return(get_attribute(si->unauth_attr,nid));
	}

static ASN1_TYPE *get_attribute(sk,nid)
STACK *sk;
int nid;
	{
	int i;
	X509_ATTRIBUTE *xa;
	ASN1_OBJECT *o;

	o=OBJ_nid2obj(nid);
	if (o == NULL) return(NULL);
	for (i=0; i<sk_num(sk); i++)
		{
		xa=(X509_ATTRIBUTE *)sk_value(sk,i);
		if (OBJ_cmp(xa->object,o) == 0)
			{
			if (xa->set && sk_num(xa->value.set))
				return((ASN1_TYPE *)sk_value(xa->value.set,0));
			else
				return(NULL);
			}
		}
	return(NULL);
	}

ASN1_OCTET_STRING *PKCS7_digest_from_attributes(sk)
STACK *sk;
	{
	X509_ATTRIBUTE *attr;
	ASN1_TYPE *astype;
	int i;
	if (!sk || !sk_num(sk)) return NULL;
	/* Search the attributes for a digest */
	for (i = 0; i < sk_num(sk); i++)
		{
		attr = (X509_ATTRIBUTE *) sk_value(sk, i);
		if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
			{
			if (!attr->set) return NULL;
			if (!attr->value.set ||
				 !sk_num (attr->value.set) ) return NULL;
			astype = (ASN1_TYPE *) sk_value(attr->value.set, 0);
			return astype->value.octet_string;
			}
		}
	return NULL;
	}

int PKCS7_set_signed_attributes(p7si,sk)
PKCS7_SIGNER_INFO *p7si;
STACK *sk;
	{
	int i;

	if (p7si->auth_attr != NULL)
		sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
	p7si->auth_attr=sk_dup(sk);
	for (i=0; i<sk_num(sk); i++)
		{
		if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
			(X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
			return(0);
		}
	return(1);
	}

int PKCS7_set_attributes(p7si,sk)
PKCS7_SIGNER_INFO *p7si;
STACK *sk;
	{
	int i;

	if (p7si->unauth_attr != NULL)
		sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
	p7si->unauth_attr=sk_dup(sk);
	for (i=0; i<sk_num(sk); i++)
		{
		if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
			(X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
			return(0);
		}
	return(1);
	}

int PKCS7_add_signed_attribute(p7si,nid,atrtype,value)
PKCS7_SIGNER_INFO *p7si;
int nid;
int atrtype;
char *value;
	{
	return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
	}

int PKCS7_add_attribute(p7si,nid,atrtype,value)
PKCS7_SIGNER_INFO *p7si;
int nid;
int atrtype;
char *value;
	{
	return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
	}

static int add_attribute(sk, nid, atrtype, value)
STACK **sk;
int nid;
int atrtype;
char *value;
	{
	X509_ATTRIBUTE *attr=NULL;

	if (*sk == NULL)
		{
		*sk = sk_new(NULL);
new_attrib:
		attr=X509_ATTRIBUTE_create(nid,atrtype,value);
		sk_push(*sk,(char *)attr);
		}
	else
		{
		int i;

		for (i=0; i<sk_num(*sk); i++)
			{
			attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
			if (OBJ_obj2nid(attr->object) == nid)
				{
				X509_ATTRIBUTE_free(attr);
				attr=X509_ATTRIBUTE_create(nid,atrtype,value);
				sk_value(*sk,i)=(char *)attr;
				goto end;
				}
			}
		goto new_attrib;
		}
end:
	return(1);
	}