/*
* CSSM_DATA <--> krb5_data
*
* CSSM_DATA data is managed by a SecAsn1CoderRef; krb5_data data is mallocd.
*
* Both return nonzero on error.
*/
krb5_error_code pkiCssmDataToKrb5Data(
const CSSM_DATA *cd,
krb5_data *kd)
{
assert(cd != NULL);
return pkiDataToKrb5Data(cd->Data, cd->Length, kd);
}
/*
* CFDataRef --> krb5_data, mallocing the destination contents.
*/
krb5_error_code pkiCfDataToKrb5Data(
CFDataRef cfData,
krb5_data *kd) /* content mallocd and RETURNED */
{
return pkiDataToKrb5Data(CFDataGetBytePtr(cfData),
CFDataGetLength(cfData), kd);
}
/*
* Parse a ContentInfo as best we can. All return fields are optional.
* If signer_cert_status is NULL on entry, NO signature or cert evaluation
* will be performed.
*/
krb5_error_code krb5int_pkinit_parse_cms_msg(
const krb5_data *content_info,
krb5_pkinit_cert_db_t cert_db, /* may be required for SignedData */
krb5_boolean is_client_msg, /* TRUE : msg is from client */
krb5_boolean *is_signed, /* RETURNED */
krb5_boolean *is_encrypted, /* RETURNED */
krb5_data *raw_data, /* RETURNED */
krb5int_cms_content_type *inner_content_type,/* Returned, ContentType of */
/* EncapsulatedData */
krb5_data *signer_cert, /* RETURNED */
krb5int_cert_sig_status *signer_cert_status,/* RETURNED */
unsigned *num_all_certs, /* size of *all_certs RETURNED */
krb5_data **all_certs) /* entire cert chain RETURNED */
{
SecPolicySearchRef policy_search = NULL;
SecPolicyRef policy = NULL;
OSStatus ortn;
krb5_error_code krtn = 0;
CMSDecoderRef decoder = NULL;
size_t num_signers;
CMSSignerStatus signer_status;
OSStatus cert_verify_status;
CFArrayRef cf_all_certs = NULL;
int msg_is_signed = 0;
if(content_info == NULL) {
pkiDebug("krb5int_pkinit_parse_cms_msg: no ContentInfo\n");
return KRB5_CRYPTO_INTERNAL;
}
ortn = CMSDecoderCreate(&decoder);
if(ortn) {
return ENOMEM;
}
ortn = CMSDecoderUpdateMessage(decoder, content_info->data, content_info->length);
if(ortn) {
/* no verify yet, must be bad message */
krtn = KRB5_PARSE_MALFORMED;
goto errOut;
}
ortn = CMSDecoderFinalizeMessage(decoder);
if(ortn) {
pkiCssmErr("CMSDecoderFinalizeMessage", ortn);
krtn = KRB5_PARSE_MALFORMED;
goto errOut;
}
/* expect zero or one signers */
ortn = CMSDecoderGetNumSigners(decoder, &num_signers);
switch(num_signers) {
case 0:
msg_is_signed = 0;
break;
case 1:
msg_is_signed = 1;
break;
default:
krtn = KRB5_PARSE_MALFORMED;
goto errOut;
}
/*
* We need a cert verify policy even if we're not actually evaluating
* the cert due to requirements in libsecurity_smime.
*/
ortn = SecPolicySearchCreate(CSSM_CERT_X_509v3,
is_client_msg ? &CSSMOID_APPLE_TP_PKINIT_CLIENT : &CSSMOID_APPLE_TP_PKINIT_SERVER,
NULL, &policy_search);
if(ortn) {
pkiCssmErr("SecPolicySearchCreate", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
ortn = SecPolicySearchCopyNext(policy_search, &policy);
if(ortn) {
pkiCssmErr("SecPolicySearchCopyNext", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
/* get some basic status that doesn't need heavyweight evaluation */
if(msg_is_signed) {
if(is_signed) {
*is_signed = TRUE;
}
if(inner_content_type) {
CSSM_OID ec_oid = {0, NULL};
CFDataRef ec_data = NULL;
krb5int_cms_content_type ctype;
ortn = CMSDecoderCopyEncapsulatedContentType(decoder, &ec_data);
if(ortn || (ec_data == NULL)) {
pkiCssmErr("CMSDecoderCopyEncapsulatedContentType", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
ec_oid.Data = (uint8 *)CFDataGetBytePtr(ec_data);
ec_oid.Length = CFDataGetLength(ec_data);
if(pkiCompareCssmData(&ec_oid, &CSSMOID_PKCS7_Data)) {
ctype = ECT_Data;
}
else if(pkiCompareCssmData(&ec_oid, &CSSMOID_PKCS7_SignedData)) {
ctype = ECT_SignedData;
}
else if(pkiCompareCssmData(&ec_oid, &CSSMOID_PKCS7_EnvelopedData)) {
ctype = ECT_EnvelopedData;
}
else if(pkiCompareCssmData(&ec_oid, &CSSMOID_PKCS7_EncryptedData)) {
ctype = ECT_EncryptedData;
}
else if(pkiCompareCssmData(&ec_oid, &_CSSMOID_PKINIT_AUTH_DATA)) {
ctype = ECT_PkAuthData;
}
else if(pkiCompareCssmData(&ec_oid, &_CSSMOID_PKINIT_RKEY_DATA)) {
ctype = ECT_PkReplyKeyKata;
}
else {
ctype = ECT_Other;
}
*inner_content_type = ctype;
CFRelease(ec_data);
}
/*
* Get SignedData's certs if the caller wants them
*/
if(all_certs) {
ortn = CMSDecoderCopyAllCerts(decoder, &cf_all_certs);
if(ortn) {
pkiCssmErr("CMSDecoderCopyAllCerts", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
krtn = pkiCertArrayToKrb5Data(cf_all_certs, num_all_certs, all_certs);
if(krtn) {
goto errOut;
}
}
/* optional signer cert */
if(signer_cert) {
SecCertificateRef sec_signer_cert = NULL;
CSSM_DATA cert_data;
ortn = CMSDecoderCopySignerCert(decoder, 0, &sec_signer_cert);
if(ortn) {
/* should never happen if it's signed */
pkiCssmErr("CMSDecoderCopySignerStatus", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
ortn = SecCertificateGetData(sec_signer_cert, &cert_data);
if(ortn) {
pkiCssmErr("SecCertificateGetData", ortn);
CFRelease(sec_signer_cert);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
krtn = pkiDataToKrb5Data(cert_data.Data, cert_data.Length, signer_cert);
CFRelease(sec_signer_cert);
if(krtn) {
goto errOut;
}
}
}
else {
/* not signed */
if(is_signed) {
*is_signed = FALSE;
}
if(inner_content_type) {
*inner_content_type = ECT_Other;
}
if(signer_cert) {
signer_cert->data = NULL;
signer_cert->length = 0;
}
if(signer_cert_status) {
*signer_cert_status = pki_not_signed;
}
if(num_all_certs) {
*num_all_certs = 0;
}
if(all_certs) {
*all_certs = NULL;
}
}
if(is_encrypted) {
Boolean bencr;
ortn = CMSDecoderIsContentEncrypted(decoder, &bencr);
if(ortn) {
pkiCssmErr("CMSDecoderCopySignerStatus", ortn);
krtn = KRB5_CRYPTO_INTERNAL;
goto errOut;
}
*is_encrypted = bencr ? TRUE : FALSE;
}
/*
* Verify signature and cert. The actual verify operation is optional,
* per our signer_cert_status argument, but we do this anyway if we need
* to get the signer cert.
*/
if((signer_cert_status != NULL) || (signer_cert != NULL)) {
ortn = CMSDecoderCopySignerStatus(decoder,
0, /* signerIndex */
policy,
signer_cert_status ? TRUE : FALSE, /* evaluateSecTrust */
&signer_status,
NULL, /* secTrust - not needed */
&cert_verify_status);
if(ortn) {
/* gross error - subsequent processing impossible */
pkiCssmErr("CMSDecoderCopySignerStatus", ortn);
krtn = KRB5_PARSE_MALFORMED;
goto errOut;
}
}
/* obtain & return status */
if(signer_cert_status) {
*signer_cert_status = pkiInferSigStatus(signer_status, cert_verify_status);
}
/* finally, the payload */
if(raw_data) {
CFDataRef cf_content = NULL;
ortn = CMSDecoderCopyContent(decoder, &cf_content);
if(ortn) {
pkiCssmErr("CMSDecoderCopyContent", ortn);
krtn = KRB5_PARSE_MALFORMED;
goto errOut;
}
krtn = pkiCfDataToKrb5Data(cf_content, raw_data);
CFRELEASE(cf_content);
}
errOut:
CFRELEASE(policy_search);
CFRELEASE(policy);
CFRELEASE(cf_all_certs);
CFRELEASE(decoder);
return krtn;
}
