void CL_certCrlDecodeComponents(
const CssmData &signedItem, // DER-encoded cert or CRL
CssmOwnedData &tbsBlob, // still DER-encoded
CssmOwnedData &algId, // ditto
CssmOwnedData &rawSig) // raw bits (not an encoded AsnBits)
{
/* BER-decode into temp memory */
NSS_SignedCertOrCRL nssObj;
SecNssCoder coder;
PRErrorCode prtn;
memset(&nssObj, 0, sizeof(nssObj));
prtn = coder.decode(signedItem.data(), signedItem.length(),
kSecAsn1SignedCertOrCRLTemplate, &nssObj);
if(prtn) {
CssmError::throwMe(CSSMERR_CL_UNKNOWN_FORMAT);
}
/* tbsBlob and algId are raw ASN_ANY including tags, which we pass
* back to caller intact */
tbsBlob.copy(nssObj.tbsBlob.Data, nssObj.tbsBlob.Length);
algId.copy(nssObj.signatureAlgorithm.Data,
nssObj.signatureAlgorithm.Length);
/* signature is a bit string which we do in fact decode */
rawSig.copy(nssObj.signature.Data,
(nssObj.signature.Length + 7) / 8);
}
static bool getFieldIssuerStd(
DecodedItem &item,
unsigned index, // which occurrence (0 = first)
uint32 &numFields, // RETURNED
CssmOwnedData &fieldValue) // RETURNED
{
if(index != 0) {
return false;
}
const DecodedCert &cert = dynamic_cast<const DecodedCert &>(item);
fieldValue.copy(cert.mCert.tbs.derIssuer);
numFields = 1;
return true;
}
/***
*** Signature
*** Format = raw bytes
*** read-only
***/
static bool getField_Signature (
DecodedItem &item,
unsigned index, // which occurrence (0 = first)
uint32 &numFields, // RETURNED
CssmOwnedData &fieldValue) // RETURNED
{
const DecodedCert &cert = dynamic_cast<const DecodedCert &>(item);
const CSSM_DATA &sigBits = cert.mCert.signature;
if(!tbsGetCheck(sigBits.Data, index)) {
return false;
}
fieldValue.copy(sigBits.Data, (sigBits.Length + 7) / 8);
numFields = 1;
return true;
}
/***
*** Serial Number
*** Format = DER-encoded int, variable length
***/
static bool getField_SerialNumber (
DecodedItem &item,
unsigned index, // which occurrence (0 = first)
uint32 &numFields, // RETURNED
CssmOwnedData &fieldValue) // RETURNED
{
const DecodedCert &cert = dynamic_cast<const DecodedCert &>(item);
const CSSM_DATA &sn = cert.mCert.tbs.serialNumber;
if(!tbsGetCheck(sn.Data, index)) {
return false;
}
fieldValue.copy(sn.Data, sn.Length);
numFields = 1;
return true;
}
/***
*** Version
*** Format = DER-encoded int (max of four bytes in this case)
***/
static bool getField_Version (
DecodedItem &item,
unsigned index, // which occurrence (0 = first)
uint32 &numFields, // RETURNED
CssmOwnedData &fieldValue) // RETURNED
{
const DecodedCert &cert = dynamic_cast<const DecodedCert &>(item);
const CSSM_DATA &vers = cert.mCert.tbs.version;
if(!tbsGetCheck(vers.Data, index)) {
/* not present, optional */
return false;
}
fieldValue.copy(vers.Data, vers.Length);
numFields = 1;
return true;
}
static bool getField_IssuerUniqueId (
DecodedItem &item,
unsigned index, // which occurrence (0 = first)
uint32 &numFields, // RETURNED
CssmOwnedData &fieldValue) // RETURNED
{
const DecodedCert &cert = dynamic_cast<const DecodedCert &>(item);
const CSSM_DATA &srcBits = cert.mCert.tbs.issuerID;
if(!tbsGetCheck(srcBits.Data, index)) {
return false;
}
/* That CSSM_DATA is a decoded BITSTRING; its length is in bits */
CSSM_DATA tmp = srcBits;
tmp.Length = (tmp.Length + 7) / 8;
fieldValue.copy(tmp.Data, tmp.Length);
numFields = 1;
return true;
}
/*
* Infer DescriptiveData (i.e., comment) from a SecKeyRef's PrintName
* attribute.
*/
void impExpOpensshInferDescData(
SecKeyRef keyRef,
CssmOwnedData &descData)
{
OSStatus ortn;
SecKeychainAttributeInfo attrInfo;
SecKeychainAttrType attrType = kSecKeyPrintName;
attrInfo.count = 1;
attrInfo.tag = &attrType;
attrInfo.format = NULL;
SecKeychainAttributeList *attrList = NULL;
ortn = SecKeychainItemCopyAttributesAndData(
(SecKeychainItemRef)keyRef,
&attrInfo,
NULL, // itemClass
&attrList,
NULL, // don't need the data
NULL);
if(ortn) {
SecSSHDbg("SecKeychainItemCopyAttributesAndData returned %ld", (unsigned long)ortn);
return;
}
/* subsequent errors to errOut: */
SecKeychainAttribute *attr = attrList->attr;
/*
* On a previous import, we would have set this to something like
* "OpenSSHv2 Public Key: comment".
* We want to strip off everything up to the actual comment.
*/
unsigned toStrip = 0;
/* min length of attribute value for this code to be meaningful */
unsigned len = strlen(SSHv2_PUB_KEY_NAME) + 1;
char *printNameStr = NULL;
if(len < attr->length) {
printNameStr = (char *)malloc(attr->length + 1);
memmove(printNameStr, attr->data, attr->length);
printNameStr[attr->length] = '\0';
if(strstr(printNameStr, SSHv2_PUB_KEY_NAME) == printNameStr) {
toStrip = strlen(SSHv2_PUB_KEY_NAME);
}
else if(strstr(printNameStr, SSHv1_PUB_KEY_NAME) == printNameStr) {
toStrip = strlen(SSHv1_PUB_KEY_NAME);
}
else if(strstr(printNameStr, SSHv1_PRIV_KEY_NAME) == printNameStr) {
toStrip = strlen(SSHv1_PRIV_KEY_NAME);
}
if(toStrip) {
/* only strip if we have ": " after toStrip bytes */
if((printNameStr[toStrip] == ':') && (printNameStr[toStrip+1] == ' ')) {
toStrip += 2;
}
}
}
if(printNameStr) {
free(printNameStr);
}
len = attr->length;
unsigned char *attrVal;
if(len < toStrip) {
SecSSHDbg("impExpOpensshInferDescData: string parse screwup");
goto errOut;
}
if(len > toStrip) {
/* Normal case of stripping off leading header */
len -= toStrip;
}
else {
/*
* If equal, then the attr value *is* "OpenSSHv2 Public Key: " with
* no comment. Not sure how that could happen, but let's be careful.
*/
toStrip = 0;
}
attrVal = ((unsigned char *)attr->data) + toStrip;
descData.copy(attrVal, len);
errOut:
SecKeychainItemFreeAttributesAndData(attrList, NULL);
return;
}
