/*
* read an attribute of type string
*/
char *sigattr_string(scep_t *scep, char *attrname) {
STACK_OF(X509_ATTRIBUTE) *sig_attribs;
ASN1_OBJECT *asn1_obj;
ASN1_TYPE *asn1_type;
X509_ATTRIBUTE *attr;
int len, i;
char *data = NULL;
scepmsg_t *msg;
if (debug)
BIO_printf(bio_err, "%s:%d: looking for attribute '%s'\n",
__FILE__, __LINE__, attrname);
/* decide which message to study: client reads attrs from reply */
if (scep->client)
msg = &scep->reply;
else
msg = &scep->request;
/* find the object we by name */
asn1_obj = OBJ_nid2obj(OBJ_sn2nid(attrname));
asn1_type = NULL;
/* retrieve the stack of signed attributes */
if (NULL == (sig_attribs = PKCS7_get_signed_attributes(msg->si))) {
BIO_printf(bio_err, "%s:%d: no signed attributes\n",
__FILE__, __LINE__);
return NULL;
}
/* scan all attributes for the one we are looking for */
for (i = 0; i < sk_X509_ATTRIBUTE_num(sig_attribs); i++) {
attr = sk_X509_ATTRIBUTE_value(sig_attribs, i);
if (OBJ_cmp(attr->object, asn1_obj) == 0) {
if (debug)
BIO_printf(bio_err, "%s:%d: found attribute\n",
__FILE__, __LINE__);
asn1_type = sk_ASN1_TYPE_value(attr->value.set, 0);
break;
}
}
/* if we cannot find the required argument, we just return NULL */
if (asn1_type == NULL) {
BIO_printf(bio_err, "%s:%d: cannot find attribute\n",
__FILE__, __LINE__);
goto err;
}
if (ASN1_TYPE_get(asn1_type) != V_ASN1_PRINTABLESTRING) {
BIO_printf(bio_err, "%s:%d: attribute has wrong type\n",
__FILE__, __LINE__);
goto err;
}
if (debug)
BIO_printf(bio_err, "%s:%d: found attribute '%s'\n",
__FILE__, __LINE__, attrname);
/* unpack the ASN1_STRING into a C-String (0-terminated) */
len = ASN1_STRING_length(asn1_type->value.asn1_string);
data = (char *)malloc(1 + len);
memcpy(data, ASN1_STRING_data(asn1_type->value.asn1_string), len);
data[len] = '\0';
if (debug)
BIO_printf(bio_err, "%s:%d: value of %d bytes retrieved\n",
__FILE__, __LINE__, len);
/* return the data */
return data;
err:
ERR_print_errors(bio_err);
return NULL;
}
ASN1_OCTET_STRING *sigattr_asn1_octet(scep_t *scep, char *attrname) {
STACK_OF(X509_ATTRIBUTE) *sig_attribs;
ASN1_OBJECT *asn1_obj;
ASN1_TYPE *asn1_type;
X509_ATTRIBUTE *attr;
int i;
scepmsg_t *msg;
int single;
if (debug)
BIO_printf(bio_err, "%s:%d: looking for attribute '%s'\n",
__FILE__, __LINE__, attrname);
/* decide which message to study: client reads attrs from reply */
if (scep->client)
msg = &scep->reply;
else
msg = &scep->request;
/* find the object we by name */
asn1_obj = OBJ_nid2obj(OBJ_sn2nid(attrname));
asn1_type = NULL;
/* retrieve the stack of signed attributes */
if (NULL == (sig_attribs = PKCS7_get_signed_attributes(msg->si))) {
BIO_printf(bio_err, "%s:%d: signed attributes not found\n",
__FILE__, __LINE__);
return NULL;
}
/* scan all attributes for the one we are looking for */
for (i = 0; i < sk_X509_ATTRIBUTE_num(sig_attribs); i++) {
attr = sk_X509_ATTRIBUTE_value(sig_attribs, i);
if (OBJ_cmp(attr->object, asn1_obj) == 0) {
#if OPENSSL_VERSION_NUMBER < 0x00907000L
/* attr->set was replaced with attr->single (with opposite
meaning) somewhere between 0.9.6m-engine and 0.9.7d */
single = !attr->set;
#else
single = attr->single;
#endif
if (single || (sk_ASN1_TYPE_num(attr->value.set) == 0)) {
BIO_printf(bio_err, "%s:%d: attr has no val\n",__FILE__, __LINE__);
goto err;
BIO_printf(bio_err, "%s:%d: attr has no val\n",
__FILE__, __LINE__);
goto err;
}
if (debug)
BIO_printf(bio_err, "%s:%d: found matching "
"attribute with %d values\n", __FILE__,
__LINE__,
sk_ASN1_TYPE_num(attr->value.set));
asn1_type = sk_ASN1_TYPE_value(attr->value.set, 0);
if (debug)
BIO_printf(bio_err, "%s:%d: type found: %p\n",
__FILE__, __LINE__, asn1_type);
break;
}
}
/* if we cannot find the required argument, we just return NULL */
if (debug)
BIO_printf(bio_err, "%s:%d: checking for attribute\n",
__FILE__, __LINE__);
if (asn1_type == NULL) {
BIO_printf(bio_err, "%s:%d: attribute has no type\n",
__FILE__, __LINE__);
goto err;
}
if (ASN1_TYPE_get(asn1_type) != V_ASN1_OCTET_STRING) {
BIO_printf(bio_err, "%s:%d: attribute has wrong type\n",
__FILE__, __LINE__);
goto err;
}
if (debug)
BIO_printf(bio_err, "%s:%d: found attribute '%s'\n",
__FILE__, __LINE__, attrname);
/* this is an ASN1_OCTET_STRING, so we can retrieve the */
/* appropriate element of the union */
return asn1_type->value.octet_string;
/* error return, or attribute not found */
err:
if (debug)
BIO_printf(bio_err, "%s:%d: attribute not found or error\n",
__FILE__, __LINE__);
ERR_print_errors(bio_err);
return NULL;
}
/*******************************************************************************
函数名称: cert_pkcs7_unwrap
功能描述: 解析从服务器收到的信息，包括验证签名以及解密。
输入参数: struct scep *s, SCEP操作的结构体指针。
输出参数: 无
返 回 值: 1,成功；-1，失败
--------------------------------------------------------------------------------
最近一次修改记录:
修改作者:王朝
修改目的:添加新函数
修改日期:2009年12月28日
*********************************************************************************/
s32 cert_pkcs7_unwrap(struct scep *s)
{
BIO *memorybio = NULL;
BIO *outbio = NULL;
BIO *pkcs7bio = NULL;
s32 bytes, used, retval = -1;
STACK_OF(PKCS7_SIGNER_INFO) *sk = NULL;
PKCS7 *p7enc = NULL;
PKCS7_SIGNER_INFO *si = NULL;
STACK_OF(X509_ATTRIBUTE) *attribs = NULL;
s8 *p = NULL;
u8 buffer[1024];
X509 *recipientcert = NULL;
EVP_PKEY *recipientkey = NULL;
/* Create new memory BIO for outer PKCS#7 */
memorybio = BIO_new(BIO_s_mem());
/* Read in data */
if ((BIO_write(memorybio, s->reply_payload, s->reply_len)) <= 0)
{
goto end;
}
BIO_set_flags(memorybio, BIO_FLAGS_MEM_RDONLY);
s->reply_p7 = d2i_PKCS7_bio(memorybio, NULL);
BIO_free(memorybio);
memorybio = NULL;
/* Make sure this is a signed PKCS#7 */
if (!PKCS7_type_is_signed(s->reply_p7))
{
goto end;
}
/* Create BIO for content data */
pkcs7bio = PKCS7_dataInit(s->reply_p7, NULL);
if (pkcs7bio == NULL)
{
goto end;
}
/* */
outbio = BIO_new(BIO_s_mem());
used = 0;
for (;;)
{
bytes = BIO_read(pkcs7bio, buffer, sizeof(buffer));
used += bytes;
if (bytes <= 0) break;
BIO_write(outbio, buffer, bytes);
}
(void)BIO_flush(outbio);
/* Get signer */
sk = PKCS7_get_signer_info(s->reply_p7);
if (sk == NULL)
{
goto end;
}
/* Verify signature */
si = sk_PKCS7_SIGNER_INFO_value(sk, 0);
if (PKCS7_signatureVerify(pkcs7bio, s->reply_p7, si, cert_cacert) <= 0)
{
goto end;
}
/* Get signed attributes */
attribs = PKCS7_get_signed_attributes(si);
if (attribs == NULL)
{
goto end;
}
/* Transaction id */
if (1 != cert_get_signed_attribute(attribs, nid_transId, V_ASN1_PRINTABLESTRING, &p))
{
goto end;
}
if (strncmp(s->transaction_id, p, strlen(p)))
{
goto end;
}
/* Message type, should be of type CertRep */
if (1 != cert_get_signed_attribute(attribs, nid_messageType, V_ASN1_PRINTABLESTRING, &p))
{
goto end;
}
if (atoi(p) != 3)
{
goto end;
}
/* Sender and recipient nonces: */
if (1 == cert_get_signed_attribute(attribs, nid_senderNonce, V_ASN1_OCTET_STRING, &p))
{
s->reply_sender_nonce = (u8 *)p;
}
else
{
s->reply_sender_nonce = NULL;
}
if ( 1 != cert_get_signed_attribute(attribs, nid_recipientNonce,V_ASN1_OCTET_STRING, &p))
{
goto end;
}
s->reply_recipient_nonce = (u8 *)p;
/* Get pkiStatus */
if (1 != cert_get_signed_attribute(attribs, nid_pkiStatus,V_ASN1_PRINTABLESTRING, &p))
{
goto end;
}
switch (atoi(p))
{
case SCEP_PKISTATUS_SUCCESS:
s->pki_status = SCEP_PKISTATUS_SUCCESS;
break;
case SCEP_PKISTATUS_FAILURE:
s->pki_status = SCEP_PKISTATUS_FAILURE;
break;
case SCEP_PKISTATUS_PENDING:
s->pki_status = SCEP_PKISTATUS_PENDING;
break;
default:
goto end;
}
/* Get failInfo */
if (s->pki_status == SCEP_PKISTATUS_FAILURE)
{
if (1 != cert_get_signed_attribute(attribs, nid_failInfo,V_ASN1_PRINTABLESTRING, &p))
{
goto end;
}
switch (atoi(p))
{
case SCEP_FAILINFO_BADALG:
s->fail_info = SCEP_FAILINFO_BADALG;
break;
case SCEP_FAILINFO_BADMSGCHK:
s->fail_info = SCEP_FAILINFO_BADMSGCHK;
break;
case SCEP_FAILINFO_BADREQ:
s->fail_info = SCEP_FAILINFO_BADREQ;
break;
case SCEP_FAILINFO_BADTIME:
s->fail_info = SCEP_FAILINFO_BADTIME;
break;
case SCEP_FAILINFO_BADCERTID:
s->fail_info = SCEP_FAILINFO_BADCERTID;
break;
default:
goto end;
}
}
/* If FAILURE or PENDING, we can return */
if (s->pki_status != SCEP_PKISTATUS_SUCCESS)
{
/* There shouldn't be any more data... */
retval = 1;
goto end;
}
/* We got success and expect data */
if (used == 0)
{
goto end;
}
/* Decrypt the inner PKCS#7 */
if ((s->request_type == SCEP_REQUEST_PKCSREQ) || (s->request_type == SCEP_REQUEST_GETCERTINIT))
{
recipientcert = s->signercert;
recipientkey = s->signerkey;
}
else
{
recipientcert = cert_localcert;
recipientkey = cert_rsa;
}
p7enc = d2i_PKCS7_bio(outbio, NULL);
if (p7enc == NULL)
{
goto end;
}
BIO_free(outbio);
outbio = NULL;
/* Decrypt the data */
outbio = BIO_new(BIO_s_mem());
if (PKCS7_decrypt(p7enc, recipientkey, recipientcert, outbio, 0) == 0)
{
goto end;
}
(void)BIO_flush(outbio);
/* Write decrypted data */
s->reply_len = BIO_get_mem_data(outbio, &s->reply_payload);
BIO_set_flags(outbio, BIO_FLAGS_MEM_RDONLY);
s->reply_p7 = d2i_PKCS7_bio(outbio, NULL);
retval = 1;
end:
if(NULL != outbio)
{
BIO_free(outbio);
}
if(NULL != memorybio)
{
BIO_free(memorybio);
}
if(NULL != pkcs7bio)
{
BIO_free(pkcs7bio);
}
if(NULL != p7enc)
{
PKCS7_free(p7enc);
}
return retval;
}
/* Load a DER formatted file into internal SCEP_MSG structure */
SCEP_MSG *d2i_SCEP_MSG_bio (BIO *inbio) {
BIO *outbio = NULL;
BIO *p7bio = NULL;
PKCS7 *p7 = NULL;
// BIO *bio_err = NULL;
SCEP_MSG *msg = NULL;
int bytes, length, fd, used;
int nMessageType = -1, nPkiStatus = -1;
PKCS7_SIGNER_INFO *si = NULL;
PKCS7_RECIP_INFO *ri = NULL;
STACK_OF(X509_ATTRIBUTE) *sig_attribs = NULL;
PKCS7 *p7env = NULL;
SCEP_RECIP_INFO *rinfo = NULL;
char buffer[1024];
char *data = NULL;
char *tmp_string = NULL;
int debug = 0;
int i;
// if ((bio_err=BIO_new(BIO_s_file())) != NULL)
// BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
msg = (SCEP_MSG *) OPENSSL_malloc ( sizeof(SCEP_MSG));
if( msg == NULL ) return (NULL);
/* decode the data */
p7 = d2i_PKCS7_bio(inbio, NULL);
if (p7 == NULL) goto err;
/* make sure this is a signed data PKCS#7 */
// if (!PKCS7_type_is_signed(p7)) {
// BIO_printf(bio_err, "%s:%d: supplied PKCS#7 is not signed "
// "data\n", __FILE__, __LINE__);
// goto err;
// }
/* create BIOs to read signed content data from */
p7bio = PKCS7_dataInit(p7, NULL);
if (p7bio == NULL) goto err;
/* Use an outbio and fill it with data from the p7 */
outbio = BIO_new(BIO_s_mem());
used = 0;
for (;;) {
bytes = BIO_read(p7bio, buffer, sizeof(buffer));
used += bytes;
if (bytes <= 0) break;
BIO_write(outbio, buffer, bytes);
}
BIO_flush(outbio);
/* there should be exactly one signer info */
msg->sk_signer_info = PKCS7_get_signer_info(p7);
if (msg->sk_signer_info == NULL) {
goto err;
}
if (sk_PKCS7_SIGNER_INFO_num(msg->sk_signer_info) != 1) {
goto err;
}
si = sk_PKCS7_SIGNER_INFO_value(msg->sk_signer_info, 0);
msg->signer_ias = si->issuer_and_serial;
msg->signer_cert = PKCS7_cert_from_signer_info( p7, si );
/* If msg->signer_cert == NULL there is no signer certificate,
* otherwise the certificate is included into the PKCS#7 envelope
* this certificate may be self signed, but for the PKCS7_
* signatureVerify method, this does not matter */
/* verify the PKCS#7 using the store just constructed */
if (PKCS7_signatureVerify(p7bio, p7, si,
msg->signer_cert) <= 0) {
// BIO_printf(bio_err, "%s:%d: verification failed\n", __FILE__,
// __LINE__);
goto err;
}
/* extract the signed attributes */
msg->attrs = PKCS7_get_signed_attributes(si);
if ((msg->attrs == NULL) || (sk_X509_ATTRIBUTE_num(msg->attrs) == 0)){
goto err;
}
tmp_string = (char *)
SCEP_get_string_attr_by_name(msg->attrs, "messageType");
if( tmp_string != NULL ) {
msg->messageType = atoi( tmp_string );
free( tmp_string );
tmp_string = NULL;
} else {
msg->messageType = -1;
}
/* unpack the internal PKCS#7 */
p7env = d2i_PKCS7_bio(outbio, NULL);
if (p7env == NULL) return msg;
i=OBJ_obj2nid(p7env->type);
msg->env_data.NID_p7data = i;
msg->env_data.p7env = p7env;
/* use a commodity variable */
rinfo = &(msg->env_data.recip_info);
switch(i) {
case NID_pkcs7_signed:
break;
case NID_pkcs7_signedAndEnveloped:
rinfo->sk_recip_info =
p7env->d.signed_and_enveloped->recipientinfo;
break;
case NID_pkcs7_enveloped:
rinfo->sk_recip_info =
p7env->d.enveloped->recipientinfo;
break;
default:
// BIO_printf( bio_err, "%s:%d: unknown PKCS7 structure\n",
// __FILE__, __LINE__);
break;
}
/* Lets do the pub key stuff :-) */
// FIXME: usaly only 1, but pix has 4 in structure - to be clarified...
// so currently set to 4 to get it working with cisco-pix
if( sk_PKCS7_RECIP_INFO_num(rinfo->sk_recip_info) > 4 ) {
goto err;
}
/* Let's get the recipient info at stack num 0, the first and
* hopefully, the only one */
ri = sk_PKCS7_RECIP_INFO_value( rinfo->sk_recip_info, 0);
/* Usually certificates are not present, but in case the standard
* will be updated... */
// if (debug && ri->cert == NULL) {
// BIO_printf( bio_err,
// "%s:%d: Recipient info cert %d missing\n",
// __FILE__, __LINE__, 0);
// }
rinfo->ias = ri->issuer_and_serial;
/*
if( rinfo->ias != NULL ) {
BIO_printf(bio_err, "%s:%d: Recip cert issued by ",
__FILE__, __LINE__);
X509_NAME_print_ex (bio_err, rinfo->ias->issuer,
0, XN_FLAG_RFC2253&(~ASN1_STRFLGS_ESC_MSB));
BIO_printf(bio_err, "\n%s:%d: Recip cert serial: %s\n",
__FILE__, __LINE__,
BN_bn2hex(ASN1_INTEGER_to_BN(rinfo->ias->serial,
NULL)));
};
*/
if( ri->cert ) {
/* Usually this does not happen to be included in
* the pkcs7env data, but in case we just get it */
sk_X509_push( rinfo->sk_recip_certs, ri->cert );
/*
if ( debug ) {
BIO_printf(bio_err, "%s:%d: Recipient cert for ",
__FILE__, __LINE__);
X509_NAME_print_ex (bio_err, X509_get_subject_name(ri->cert),
0, XN_FLAG_RFC2253&(~ASN1_STRFLGS_ESC_MSB));
BIO_printf(bio_err, "\n");
}
*/
}
/* perform some consistency checks */
/* UniCert 3.1.2 seems to out the message type, so fudge */
/* the value of 3 (CertRep) if it is missing (problem pointed */
/* out by Peter Onion */
/*
if (NULL == req->messageType) {
BIO_printf(bio_err, "%s:%d: no message type (setting to 3)\n",
__FILE__, __LINE__);
req->messageType = "3"; // XXX should we strdup here?
}
*/
/* UniCert doesn't seem to bother to put in a senderNonce, */
/* so don't get upset if it is missing. */
/*
if (NULL == scep->senderNonce) {
BIO_printf(bio_err, "%s:%d: senderNonce missing\n",
__FILE__, __LINE__);
}
*/
/* perform some type/status dependent checks */
/*
if ((used == 0) && (nMessageType != 3)) {
BIO_printf(bio_err, "%s:%d: only CertRep message may be "
"empty\n", __FILE__, __LINE__);
goto err;
}
if ((used == 0) && (nMessageType == 3) && (nPkiStatus == 0)) {
BIO_printf(bio_err, "%s:%d: CertRep may only be empty for "
"failure or pending\n", __FILE__, __LINE__);
goto err;
}
*/
/* no content is only allowed if the message is a CertRep with */
/* a pkiStatus of failure or pending */
/*
if (used == 0) {
BIO_printf(bio_err, "%s:%d: empty PKCSReq, must be failure or "
"pending\n", __FILE__, __LINE__);
goto signedonly;
}
if (debug)
BIO_printf(bio_err, "%s:%d: working on inner pkcs#7\n",
__FILE__, __LINE__);
*/
BIO_free(outbio);
signedonly:
/* we were successfull in extracting the telescoping PKCS#7's */
return(msg);
err:
// if( debug ) ERR_print_errors(bio_err);
return(NULL);
}
/*
* Unwrap PKCS#7 data and decrypt if necessary
*/
int pkcs7_unwrap(struct scep *s, struct sscep_ctx *ctx, struct sscep_operation_info *op_info, char* data, int datalen)
{
BIO *memorybio = NULL;
BIO *outbio = NULL;
BIO *pkcs7bio = NULL;
int i, bytes, used;
STACK_OF(PKCS7_SIGNER_INFO) *sk;
PKCS7 *p7enc = NULL;
PKCS7_SIGNER_INFO *si;
STACK_OF(X509_ATTRIBUTE) *attribs;
char *p = NULL;
unsigned char buffer[1024];
X509 *recipientcert;
EVP_PKEY *recipientkey;
int ret = SCEP_PKISTATUS_P7;
/* Create new memory BIO for outer PKCS#7 */
memorybio = BIO_new(BIO_s_mem());
/* Read in data */
if (ctx->verbose){
qeo_log_i("reading outer PKCS#7");
}
if (BIO_write(memorybio, data, datalen) <= 0) {
qeo_log_e("error reading PKCS#7 data");
goto error;
}
if (ctx->verbose){
qeo_log_i("PKCS#7 payload size: %d bytes", datalen);
}
s->reply_p7 = d2i_PKCS7_bio(memorybio, NULL );
if (s->reply_p7 == NULL ) {
qeo_log_e("error retrieving PKCS#7 data");
goto error;
}
if (ctx->debug) {
qeo_log_i("printing PEM fomatted PKCS#7");
PEM_write_PKCS7(stdout, s->reply_p7);
}
/* Make sure this is a signed PKCS#7 */
if (!PKCS7_type_is_signed(s->reply_p7)) {
qeo_log_e("PKCS#7 is not signed!");
goto error;
}
/* Create BIO for content data */
pkcs7bio = PKCS7_dataInit(s->reply_p7, NULL );
if (pkcs7bio == NULL ) {
qeo_log_e("cannot get PKCS#7 data");
goto error;
}
/* Copy enveloped data from PKCS#7 */
outbio = BIO_new(BIO_s_mem());
used = 0;
for (;;) {
bytes = BIO_read(pkcs7bio, buffer, sizeof(buffer));
used += bytes;
if (bytes <= 0)
break;
BIO_write(outbio, buffer, bytes);
}
(void)BIO_flush(outbio);
if (ctx->verbose){
qeo_log_i("PKCS#7 contains %d bytes of enveloped data", used);
}
/* Get signer */
sk = PKCS7_get_signer_info(s->reply_p7);
if (sk == NULL ) {
qeo_log_e("cannot get signer info!");
goto error;
}
/* Verify signature */
if (ctx->verbose){
qeo_log_i("verifying signature");
}
si = sk_PKCS7_SIGNER_INFO_value(sk, 0);
if (PKCS7_signatureVerify(pkcs7bio, s->reply_p7, si, op_info->racert) <= 0) {
qeo_log_e("error verifying signature");
goto error;
}
if (ctx->verbose){
qeo_log_i("signature ok");
}
/* Get signed attributes */
if (ctx->verbose){
qeo_log_i("finding signed attributes");
}
attribs = PKCS7_get_signed_attributes(si);
if (attribs == NULL ) {
qeo_log_e("no attributes found");
goto error;
}
/* Transaction id */
if ((get_signed_attribute(attribs, ctx->nid_transId, V_ASN1_PRINTABLESTRING, &p, ctx)) == 1) {
qeo_log_e("cannot find transId");
goto error;
}
if (ctx->verbose){
qeo_log_i("reply transaction id: %s", p);
}
if (strncmp(s->transaction_id, p, strlen(p))) {
qeo_log_e("transaction id mismatch");
goto error;
}
free(p);
p=NULL;
/* Message type, should be of type CertRep */
if (get_signed_attribute(attribs, ctx->nid_messageType, V_ASN1_PRINTABLESTRING, &p, ctx) == 1) {
qeo_log_e("cannot find messageType");
goto error;
}
if (atoi(p) != 3) {
qeo_log_e("wrong message type in reply");
goto error;
}
if (ctx->verbose){
qeo_log_i("reply message type is good");
}
free(p);
p=NULL;
/* Recipient nonces: */
if (get_signed_attribute(attribs, ctx->nid_recipientNonce, V_ASN1_OCTET_STRING, &p, ctx) == 1) {
qeo_log_e("cannot find recipientNonce");
goto error;
}
s->reply_recipient_nonce = p;
p = NULL;
if (ctx->verbose) {
qeo_log_i("recipientNonce in reply");
}
/*
* Compare recipient nonce to original sender nonce
* The draft says nothing about this, but it makes sense to me..
* XXXXXXXXXXXXXX check
*/
for (i = 0; i < 16; i++) {
if (s->sender_nonce[i] != s->reply_recipient_nonce[i]) {
if (ctx->verbose)
qeo_log_e("corrupted nonce received");
/* Instead of exit, break out */
break;
}
}
/* Get pkiStatus */
if (get_signed_attribute(attribs, ctx->nid_pkiStatus, V_ASN1_PRINTABLESTRING, &p, ctx) == 1) {
qeo_log_e("cannot find pkiStatus");
/* This is a mandatory attribute.. */
goto error;
}
switch (atoi(p)) {
case SCEP_PKISTATUS_SUCCESS:
qeo_log_i("pkistatus: SUCCESS");
s->pki_status = SCEP_PKISTATUS_SUCCESS;
break;
case SCEP_PKISTATUS_FAILURE:
qeo_log_i("pkistatus: FAILURE");
s->pki_status = SCEP_PKISTATUS_FAILURE;
break;
case SCEP_PKISTATUS_PENDING:
qeo_log_i("pkistatus: PENDING");
s->pki_status = SCEP_PKISTATUS_PENDING;
break;
default:
qeo_log_e("wrong pkistatus in reply");
goto error;
}
free(p);
p=NULL;
/* Get failInfo */
if (s->pki_status == SCEP_PKISTATUS_FAILURE) {
if (get_signed_attribute(attribs, ctx->nid_failInfo, V_ASN1_PRINTABLESTRING, &p, ctx) == 1) {
qeo_log_e("cannot find failInfo");
goto error;
}
switch (atoi(p)) {
case SCEP_FAILINFO_BADALG:
s->fail_info = SCEP_FAILINFO_BADALG;
qeo_log_i("reason: %s", SCEP_FAILINFO_BADALG_STR);
break;
case SCEP_FAILINFO_BADMSGCHK:
s->fail_info = SCEP_FAILINFO_BADMSGCHK;
qeo_log_i("reason: %s", SCEP_FAILINFO_BADMSGCHK_STR);
break;
case SCEP_FAILINFO_BADREQ:
s->fail_info = SCEP_FAILINFO_BADREQ;
qeo_log_i("reason: %s", SCEP_FAILINFO_BADREQ_STR);
break;
case SCEP_FAILINFO_BADTIME:
s->fail_info = SCEP_FAILINFO_BADTIME;
qeo_log_i("reason: %s", SCEP_FAILINFO_BADTIME_STR);
break;
case SCEP_FAILINFO_BADCERTID:
s->fail_info = SCEP_FAILINFO_BADCERTID;
qeo_log_i("reason: %s", SCEP_FAILINFO_BADCERTID_STR);
break;
default:
qeo_log_e("wrong failInfo in " "reply");
goto error;
}
free(p);
p=NULL;
}
/* If FAILURE or PENDING, we can return */
if (s->pki_status != SCEP_PKISTATUS_SUCCESS) {
/* There shouldn't be any more data... */
if (ctx->verbose && (used != 0)) {
qeo_log_e("illegal size of payload");
}
return (0);
}
/* We got success and expect data */
if (used == 0) {
qeo_log_e("illegal size of payload");
goto error;
}
/* Decrypt the inner PKCS#7 */
recipientcert = s->signercert;
recipientkey = s->signerkey;
if (ctx->verbose){
qeo_log_i("reading inner PKCS#7");
}
p7enc = d2i_PKCS7_bio(outbio, NULL );
if (p7enc == NULL ) {
qeo_log_e("cannot read inner PKCS#7");
goto error;
}
BIO_free(outbio);/* No longer need it */
outbio = NULL;
if (ctx->debug) {
qeo_log_i("printing PEM fomatted PKCS#7");
PEM_write_PKCS7(stdout, p7enc);
}
/* Decrypt the data */
outbio = BIO_new(BIO_s_mem());
if (ctx->verbose){
qeo_log_i("decrypting inner PKCS#7");
}
if (PKCS7_decrypt(p7enc, recipientkey, recipientcert, outbio, 0) == 0) {
qeo_log_e("error decrypting inner PKCS#7");
goto error;
}
(void)BIO_flush(outbio);
/* Write decrypted data */
PKCS7_free(s->reply_p7);
s->reply_p7 = d2i_PKCS7_bio(outbio, NULL );
ret = 0;
error:
free(p);
BIO_free(outbio);
BIO_free_all(pkcs7bio);
BIO_free(memorybio);
PKCS7_free(p7enc);
return ret;
}
/*
* Unwrap PKCS#7 data and decrypt if necessary
*/
int pkcs7_unwrap(struct scep *s) {
BIO *memorybio;
BIO *outbio;
BIO *pkcs7bio;
int i, len, bytes, used;
STACK_OF(PKCS7_SIGNER_INFO) *sk;
PKCS7 *p7enc;
PKCS7_SIGNER_INFO *si;
STACK_OF(X509_ATTRIBUTE) *attribs;
char *p;
unsigned char buffer[1024];
X509 *recipientcert;
EVP_PKEY *recipientkey;
/* Create new memory BIO for outer PKCS#7 */
memorybio = BIO_new(BIO_s_mem());
/* Read in data */
if (v_flag)
printf("%s: reading outer PKCS#7\n",pname);
if ((len = BIO_write(memorybio, s->reply_payload, s->reply_len)) <= 0) {
fprintf(stderr, "%s: error reading PKCS#7 data\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
if (v_flag)
printf("%s: PKCS#7 payload size: %d bytes\n", pname, len);
BIO_set_flags(memorybio, BIO_FLAGS_MEM_RDONLY);
s->reply_p7 = d2i_PKCS7_bio(memorybio, NULL);
if (d_flag) {
printf("%s: printing PEM fomatted PKCS#7\n", pname);
PEM_write_PKCS7(stdout, s->reply_p7);
}
/* Make sure this is a signed PKCS#7 */
if (!PKCS7_type_is_signed(s->reply_p7)) {
fprintf(stderr, "%s: PKCS#7 is not signed!\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
/* Create BIO for content data */
pkcs7bio = PKCS7_dataInit(s->reply_p7, NULL);
if (pkcs7bio == NULL) {
fprintf(stderr, "%s: cannot get PKCS#7 data\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
/* Copy enveloped data from PKCS#7 */
outbio = BIO_new(BIO_s_mem());
used = 0;
for (;;) {
bytes = BIO_read(pkcs7bio, buffer, sizeof(buffer));
used += bytes;
if (bytes <= 0) break;
BIO_write(outbio, buffer, bytes);
}
BIO_flush(outbio);
if (v_flag)
printf("%s: PKCS#7 contains %d bytes of enveloped data\n",
pname, used);
/* Get signer */
sk = PKCS7_get_signer_info(s->reply_p7);
if (sk == NULL) {
fprintf(stderr, "%s: cannot get signer info!\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
/* Verify signature */
if (v_flag)
printf("%s: verifying signature\n", pname);
si = sk_PKCS7_SIGNER_INFO_value(sk, 0);
if (PKCS7_signatureVerify(pkcs7bio, s->reply_p7, si, cacert) <= 0) {
fprintf(stderr, "%s: error verifying signature\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
if (v_flag)
printf("%s: signature ok\n", pname);
/* Get signed attributes */
if (v_flag)
printf("%s: finding signed attributes\n", pname);
attribs = PKCS7_get_signed_attributes(si);
if (attribs == NULL) {
fprintf(stderr, "%s: no attributes found\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
/* Transaction id */
if ((get_signed_attribute(attribs, nid_transId,
V_ASN1_PRINTABLESTRING, &p)) == 1) {
fprintf(stderr, "%s: cannot find transId\n", pname);
exit (SCEP_PKISTATUS_P7);
}
if (v_flag)
printf("%s: reply transaction id: %s\n", pname, p);
if (strncmp(s->transaction_id, p, strlen(p))) {
fprintf(stderr, "%s: transaction id mismatch\n", pname);
exit (SCEP_PKISTATUS_P7);
}
/* Message type, should be of type CertRep */
if ((i = get_signed_attribute(attribs, nid_messageType,
V_ASN1_PRINTABLESTRING, &p)) == 1) {
fprintf(stderr, "%s: cannot find messageType\n", pname);
exit (SCEP_PKISTATUS_P7);
}
if (atoi(p) != 3) {
fprintf(stderr, "%s: wrong message type in reply\n", pname);
exit (SCEP_PKISTATUS_P7);
}
if (v_flag)
printf("%s: reply message type is good\n", pname);
/* Sender and recipient nonces: */
if ((i = get_signed_attribute(attribs, nid_senderNonce,
V_ASN1_OCTET_STRING, &p)) == 1) {
if (v_flag)
fprintf(stderr, "%s: cannot find senderNonce\n", pname);
/* Some implementations don't put in on reply */
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
exit (SCEP_PKISTATUS_P7); */
}
s->reply_sender_nonce = p;
if (v_flag) {
printf("%s: senderNonce in reply: ", pname);
for (i = 0; i < 16; i++) {
printf("%02X", s->reply_sender_nonce[i]);
}
printf("\n");
}
if (( i = get_signed_attribute(attribs, nid_recipientNonce,
V_ASN1_OCTET_STRING, &p)) == 1) {
fprintf(stderr, "%s: cannot find recipientNonce\n", pname);
exit (SCEP_PKISTATUS_P7);
}
s->reply_recipient_nonce = p;
if (v_flag) {
printf("%s: recipientNonce in reply: ", pname);
for (i = 0; i < 16; i++) {
printf("%02X", s->reply_recipient_nonce[i]);
}
printf("\n");
}
/*
* Compare recipient nonce to original sender nonce
* The draft says nothing about this, but it makes sense to me..
* XXXXXXXXXXXXXX check
*/
for (i = 0; i < 16; i++) {
if (s->sender_nonce[i] != s->reply_recipient_nonce[i]) {
if (v_flag)
fprintf(stderr, "%s: corrupted nonce "
"received\n", pname);
/* Instead of exit, break out */
break;
}
}
/* Get pkiStatus */
if ((i = get_signed_attribute(attribs, nid_pkiStatus,
V_ASN1_PRINTABLESTRING, &p)) == 1) {
fprintf(stderr, "%s: cannot find pkiStatus\n", pname);
/* This is a mandatory attribute.. */
exit (SCEP_PKISTATUS_P7);
}
switch (atoi(p)) {
case SCEP_PKISTATUS_SUCCESS:
printf("%s: pkistatus: SUCCESS\n",pname);
s->pki_status = SCEP_PKISTATUS_SUCCESS;
break;
case SCEP_PKISTATUS_FAILURE:
printf("%s: pkistatus: FAILURE\n",pname);
s->pki_status = SCEP_PKISTATUS_FAILURE;
break;
case SCEP_PKISTATUS_PENDING:
printf("%s: pkistatus: PENDING\n",pname);
s->pki_status = SCEP_PKISTATUS_PENDING;
break;
default:
fprintf(stderr, "%s: wrong pkistatus in reply\n",pname);
exit (SCEP_PKISTATUS_P7);
}
/* Get failInfo */
if (s->pki_status == SCEP_PKISTATUS_FAILURE) {
if ((i = get_signed_attribute(attribs, nid_failInfo,
V_ASN1_PRINTABLESTRING, &p)) == 1) {
fprintf(stderr, "%s: cannot find failInfo\n",
pname);
exit (SCEP_PKISTATUS_P7);
}
switch (atoi(p)) {
case SCEP_FAILINFO_BADALG:
s->fail_info = SCEP_FAILINFO_BADALG;
printf("%s: reason: %s\n", pname,
SCEP_FAILINFO_BADALG_STR);
break;
case SCEP_FAILINFO_BADMSGCHK:
s->fail_info = SCEP_FAILINFO_BADMSGCHK;
printf("%s: reason: %s\n", pname,
SCEP_FAILINFO_BADMSGCHK_STR);
break;
case SCEP_FAILINFO_BADREQ:
s->fail_info = SCEP_FAILINFO_BADREQ;
printf("%s: reason: %s\n", pname,
SCEP_FAILINFO_BADREQ_STR);
break;
case SCEP_FAILINFO_BADTIME:
s->fail_info = SCEP_FAILINFO_BADTIME;
printf("%s: reason: %s\n", pname,
SCEP_FAILINFO_BADTIME_STR);
break;
case SCEP_FAILINFO_BADCERTID:
s->fail_info = SCEP_FAILINFO_BADCERTID;
printf("%s: reason: %s\n", pname,
SCEP_FAILINFO_BADCERTID_STR);
break;
default:
fprintf(stderr, "%s: wrong failInfo in " "reply\n",pname);
exit (SCEP_PKISTATUS_P7);
}
}
/* If FAILURE or PENDING, we can return */
if (s->pki_status != SCEP_PKISTATUS_SUCCESS) {
/* There shouldn't be any more data... */
if (v_flag && (used != 0)) {
fprintf(stderr, "%s: illegal size of payload\n", pname);
}
return (0);
}
/* We got success and expect data */
if (used == 0) {
fprintf(stderr, "%s: illegal size of payload\n", pname);
exit (SCEP_PKISTATUS_P7);
}
/* Decrypt the inner PKCS#7 */
if ((s->request_type == SCEP_REQUEST_PKCSREQ) ||
(s->request_type == SCEP_REQUEST_GETCERTINIT)) {
recipientcert = s->signercert;
recipientkey = s->signerkey;
}
else {
recipientcert = localcert;
recipientkey = rsa;
}
if (v_flag)
printf("%s: reading inner PKCS#7\n",pname);
p7enc = d2i_PKCS7_bio(outbio, NULL);
if (p7enc == NULL) {
fprintf(stderr, "%s: cannot read inner PKCS#7\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
if (d_flag) {
printf("%s: printing PEM fomatted PKCS#7\n", pname);
PEM_write_PKCS7(stdout, p7enc);
}
/* Decrypt the data */
outbio = BIO_new(BIO_s_mem());
if (v_flag)
printf("%s: decrypting inner PKCS#7\n",pname);
if (PKCS7_decrypt(p7enc, recipientkey, recipientcert, outbio, 0) == 0) {
fprintf(stderr, "%s: error decrypting inner PKCS#7\n", pname);
ERR_print_errors_fp(stderr);
exit (SCEP_PKISTATUS_P7);
}
BIO_flush(outbio);
/* Write decrypted data */
s->reply_len = BIO_get_mem_data(outbio, &s->reply_payload);
if (v_flag)
printf("%s: PKCS#7 payload size: %d bytes\n", pname,
s->reply_len);
BIO_set_flags(outbio, BIO_FLAGS_MEM_RDONLY);
s->reply_p7 = d2i_PKCS7_bio(outbio, NULL);
return (0);
}