/*
* ShroudedKeyBag parser w/decrypt
*/
static int shroudedKeyBagParse(pkcs12_context * context, const NSS_P12_SafeBag *safeBag)
{
p12DecodeLog("Found shrouded key bag");
const NSS_P12_ShroudedKeyBag *keyBag = safeBag->bagValue.shroudedKeyBag;
SecAsn1Item ptext = {0, NULL};
require_noerr_quiet(p12Decrypt(context, &keyBag->algorithm,
&keyBag->encryptedData, &ptext), out);
/* Decode PKCS#8 formatted private key */
NSS_PrivateKeyInfo pki;
memset(&pki, 0, sizeof(pki));
require_noerr(decode_item(context, &ptext, kSecAsn1PrivateKeyInfoTemplate,
&pki), out);
DERItem algorithm = { pki.algorithm.algorithm.Data, pki.algorithm.algorithm.Length };
require(DEROidCompare(&oidRsa, &algorithm), out);
CFDataRef keyData = CFDataCreate(kCFAllocatorDefault, pki.privateKey.Data, pki.privateKey.Length);
require_noerr(emit_item(context, safeBag->bagAttrs, CFSTR("key"), keyData), out);
CFRelease(keyData);
return 0;
out:
return -1;
}
/*
* Parse an encoded NSS_P12_SafeContents. This could be either
* present as plaintext in an AuthSafe or decrypted.
*/
static int safeContentsParse(pkcs12_context * context, const SecAsn1Item *contentsBlob)
{
p12DecodeLog("safeContentsParse");
NSS_P12_SafeContents sc;
memset(&sc, 0, sizeof(sc));
require_noerr(decode_item(context, contentsBlob, NSS_P12_SafeContentsTemplate,
&sc), out);
unsigned numBags = nssArraySize((const void **)sc.bags);
unsigned int dex;
for(dex=0; dex<numBags; dex++) {
NSS_P12_SafeBag *bag = sc.bags[dex];
assert(bag != NULL);
/* ensure that *something* is there */
require(bag->bagValue.keyBag != NULL, out);
/*
* Break out to individual bag type
*/
switch(bag->type) {
case BT_ShroudedKeyBag:
require_noerr(shroudedKeyBagParse(context, bag), out);
break;
case BT_CertBag:
require_noerr(certBagParse(context, bag), out);
break;
case BT_KeyBag:
/* keyBagParse(bag); */
p12DecodeLog("Unhandled BT_KeyBag");
break;
case BT_CrlBag:
/* crlBagParse(bag); */
p12DecodeLog("Unhandled BT_CrlBag");
break;
case BT_SecretBag:
/* secretBagParse(bag); */
p12DecodeLog("Unhandled BT_SecretBag");
break;
case BT_SafeContentsBag:
/* safeContentsBagParse(bag); */
p12DecodeLog("Unhandled BT_SafeContentsBag");
break;
default:
p12DecodeLog("Unknown bag type");
goto out;
break;
}
}
return 0;
out:
return -1;
}
inline PyObject* decode_from_stream(const std::string& enc_rule, hu::InStream& stream) {
PyObject* res = PyTuple_New(enc_rule.size());
for(std::size_t i = 0; i < enc_rule.size(); ++i) {
PyObject* v = decode_item(enc_rule[i], stream);
if (v == NULL) {
return NULL;
}
PyTuple_SET_ITEM(res, i, v);
}
return res;
}
/*
* Parse an SecAsn1AlgId specific to P12.
* Decode the alg params as a NSS_P12_PBE_Params and parse and
* return the result if the pbeParams is non-NULL.
*/
static int algIdParse(pkcs12_context * context,
const SecAsn1AlgId *algId, NSS_P12_PBE_Params *pbeParams/*optional*/)
{
p12DecodeLog("algIdParse");
const SecAsn1Item *param = &algId->parameters;
require(pbeParams, out);
require(param && param->Length, out);
memset(pbeParams, 0, sizeof(*pbeParams));
require_noerr(decode_item(context, param, NSS_P12_PBE_ParamsTemplate, pbeParams), out);
return 0;
out:
return -1;
}
/*
* Parse an encoded NSS_P12_AuthenticatedSafe
*/
static int authSafeParse(pkcs12_context * context, const SecAsn1Item *authSafeBlob)
{
p12DecodeLog("authSafeParse");
NSS_P12_AuthenticatedSafe authSafe;
memset(&authSafe, 0, sizeof(authSafe));
require_noerr(decode_item(context, authSafeBlob,
NSS_P12_AuthenticatedSafeTemplate, &authSafe), out);
unsigned numInfos = nssArraySize((const void **)authSafe.info);
unsigned int dex;
for (dex=0; dex<numInfos; dex++) {
NSS_P7_DecodedContentInfo *info = authSafe.info[dex];
require_noerr_quiet(authSafeElementParse(context, info), out);
}
return 0;
out:
return -1;
}
p12_error p12decode(pkcs12_context * context, CFDataRef cdpfx)
{
int err = p12_decodeErr;
NSS_P12_DecodedPFX pfx;
memset(&pfx, 0, sizeof(pfx));
SecAsn1Item raw_blob = { CFDataGetLength(cdpfx), (void*)CFDataGetBytePtr(cdpfx) };
require_noerr_quiet(decode_item(context, &raw_blob, NSS_P12_DecodedPFXTemplate, &pfx), out);
NSS_P7_DecodedContentInfo *dci = &pfx.authSafe;
/* only support CT_Data at top level (password based integrity mode) */
require(dci->type == CT_Data, out);
require(pfx.macData, out);
require_noerr_action_quiet(p12VerifyMac(context, &pfx), out, err = p12_passwordErr);
require_noerr_quiet(authSafeParse(context, dci->content.data), out);
return errSecSuccess;
out:
return err;
}
static int emit_item(pkcs12_context * context, NSS_Attribute **attrs,
CFStringRef item_key, CFTypeRef item_value)
{
int result = -1;
/* parse attrs into friendlyName, localKeyId; ignoring generic attrs */
CFMutableDictionaryRef attr_dict = CFDictionaryCreateMutable(kCFAllocatorDefault,
0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
require(attr_dict, out);
unsigned numAttrs = nssArraySize((const void **)attrs);
unsigned int dex;
for(dex = 0; dex < numAttrs; dex++) {
NSS_Attribute *attr = attrs[dex];
unsigned numValues = nssArraySize((const void**)attr->attrValue);
DERItem type = { attr->attrType.Data, attr->attrType.Length };
if(DEROidCompare(&type, &oidFriendlyName)) {
/*
* BMP string (UniCode). Spec says only one legal value.
*/
require(numValues == 1, out);
SecAsn1Item friendly_name_asn1;
require_noerr(decode_item(context, attr->attrValue[0],
kSecAsn1BMPStringTemplate, &friendly_name_asn1), out);
CFStringRef friendly_name = CFStringCreateWithBytes(kCFAllocatorDefault,
friendly_name_asn1.Data, friendly_name_asn1.Length,
kCFStringEncodingUnicode, true);
if (friendly_name) {
CFDictionarySetValue(attr_dict, kSecImportItemLabel, friendly_name);
CFRelease(friendly_name);
}
}
else if(DEROidCompare(&type, &oidLocalKeyId)) {
/*
* Octet string. Spec says only one legal value.
*/
require(numValues == 1, out);
SecAsn1Item local_key_id;
require_noerr(decode_item(context, attr->attrValue[0],
kSecAsn1OctetStringTemplate, &local_key_id), out);
CFDataRef keyid = CFDataCreate(kCFAllocatorDefault, local_key_id.Data, local_key_id.Length);
if (keyid) {
CFDictionarySetValue(attr_dict, kSecImportItemKeyID, keyid);
CFRelease(keyid);
}
}
}
CFTypeRef key = CFDictionaryGetValue(attr_dict, kSecImportItemKeyID);
if (!key)
key = CFDictionaryGetValue(attr_dict, kSecImportItemLabel);
if (!key)
key = item_value;
CFMutableDictionaryRef item = (CFMutableDictionaryRef)CFDictionaryGetValue(context->items, key);
if (item) {
CFDictionarySetValue(item, item_key, item_value);
} else {
CFDictionarySetValue(attr_dict, item_key, item_value);
CFDictionarySetValue(context->items, key, attr_dict);
}
result = 0;
out:
CFReleaseSafe(attr_dict);
return result;
}
