mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-16 04:20:32 +01:00
444 lines
15 KiB
C
444 lines
15 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
/*
|
|
* pkix_signaturechecker.c
|
|
*
|
|
* Functions for signature validation
|
|
*
|
|
*/
|
|
|
|
#include "pkix_signaturechecker.h"
|
|
|
|
/*
|
|
* FUNCTION: pkix_SignatureCheckerstate_Destroy
|
|
* (see comments for PKIX_PL_DestructorCallback in pkix_pl_system.h)
|
|
*/
|
|
static PKIX_Error *
|
|
pkix_SignatureCheckerState_Destroy(
|
|
PKIX_PL_Object *object,
|
|
void *plContext)
|
|
{
|
|
pkix_SignatureCheckerState *state = NULL;
|
|
|
|
PKIX_ENTER(SIGNATURECHECKERSTATE,
|
|
"pkix_SignatureCheckerState_Destroy");
|
|
PKIX_NULLCHECK_ONE(object);
|
|
|
|
/* Check that this object is a signature checker state */
|
|
PKIX_CHECK(pkix_CheckType
|
|
(object, PKIX_SIGNATURECHECKERSTATE_TYPE, plContext),
|
|
PKIX_OBJECTNOTSIGNATURECHECKERSTATE);
|
|
|
|
state = (pkix_SignatureCheckerState *) object;
|
|
|
|
state->prevCertCertSign = PKIX_FALSE;
|
|
|
|
PKIX_DECREF(state->prevPublicKey);
|
|
PKIX_DECREF(state->prevPublicKeyList);
|
|
PKIX_DECREF(state->keyUsageOID);
|
|
|
|
cleanup:
|
|
|
|
PKIX_RETURN(SIGNATURECHECKERSTATE);
|
|
}
|
|
|
|
/*
|
|
* FUNCTION: pkix_SignatureCheckerState_RegisterSelf
|
|
*
|
|
* DESCRIPTION:
|
|
* Registers PKIX_SIGNATURECHECKERSTATE_TYPE and its related functions
|
|
* with systemClasses[]
|
|
*
|
|
* THREAD SAFETY:
|
|
* Not Thread Safe (see Thread Safety Definitions in Programmer's Guide)
|
|
*
|
|
* Since this function is only called by PKIX_PL_Initialize, which should
|
|
* only be called once, it is acceptable that this function is not
|
|
* thread-safe.
|
|
*/
|
|
PKIX_Error *
|
|
pkix_SignatureCheckerState_RegisterSelf(void *plContext)
|
|
{
|
|
extern pkix_ClassTable_Entry systemClasses[PKIX_NUMTYPES];
|
|
pkix_ClassTable_Entry entry;
|
|
|
|
PKIX_ENTER(SIGNATURECHECKERSTATE,
|
|
"pkix_SignatureCheckerState_RegisterSelf");
|
|
|
|
entry.description = "SignatureCheckerState";
|
|
entry.objCounter = 0;
|
|
entry.typeObjectSize = sizeof(pkix_SignatureCheckerState);
|
|
entry.destructor = pkix_SignatureCheckerState_Destroy;
|
|
entry.equalsFunction = NULL;
|
|
entry.hashcodeFunction = NULL;
|
|
entry.toStringFunction = NULL;
|
|
entry.comparator = NULL;
|
|
entry.duplicateFunction = NULL;
|
|
|
|
systemClasses[PKIX_SIGNATURECHECKERSTATE_TYPE] = entry;
|
|
|
|
PKIX_RETURN(SIGNATURECHECKERSTATE);
|
|
}
|
|
|
|
/*
|
|
* FUNCTION: pkix_SignatureCheckerState_Create
|
|
*
|
|
* DESCRIPTION:
|
|
* Allocate and initialize SignatureChecker state data.
|
|
*
|
|
* PARAMETERS
|
|
* "trustedPubKey"
|
|
* Address of trusted Anchor Public Key for verifying first Cert in the
|
|
* chain. Must be non-NULL.
|
|
* "certsRemaining"
|
|
* Number of certificates remaining in the chain.
|
|
* "pCheckerState"
|
|
* Address where SignatureCheckerState will be stored. Must be non-NULL.
|
|
* "plContext"
|
|
* Platform-specific context pointer.
|
|
*
|
|
* THREAD SAFETY:
|
|
* Not Thread Safe (see Thread Safety Definitions in Programmer's Guide)
|
|
*
|
|
* RETURNS:
|
|
* Returns NULL if the function succeeds.
|
|
* Returns a SignatureCheckerState Error if the function fails in a
|
|
* non-fatal way.
|
|
* Returns a Fatal Error if the function fails in an unrecoverable way.
|
|
*/
|
|
static PKIX_Error *
|
|
pkix_SignatureCheckerState_Create(
|
|
PKIX_PL_PublicKey *trustedPubKey,
|
|
PKIX_UInt32 certsRemaining,
|
|
pkix_SignatureCheckerState **pCheckerState,
|
|
void *plContext)
|
|
{
|
|
pkix_SignatureCheckerState *state = NULL;
|
|
PKIX_PL_OID *keyUsageOID = NULL;
|
|
|
|
PKIX_ENTER(SIGNATURECHECKERSTATE, "pkix_SignatureCheckerState_Create");
|
|
PKIX_NULLCHECK_TWO(trustedPubKey, pCheckerState);
|
|
|
|
PKIX_CHECK(PKIX_PL_Object_Alloc
|
|
(PKIX_SIGNATURECHECKERSTATE_TYPE,
|
|
sizeof (pkix_SignatureCheckerState),
|
|
(PKIX_PL_Object **)&state,
|
|
plContext),
|
|
PKIX_COULDNOTCREATESIGNATURECHECKERSTATEOBJECT);
|
|
|
|
/* Initialize fields */
|
|
|
|
state->prevCertCertSign = PKIX_TRUE;
|
|
state->prevPublicKeyList = NULL;
|
|
state->certsRemaining = certsRemaining;
|
|
|
|
PKIX_INCREF(trustedPubKey);
|
|
state->prevPublicKey = trustedPubKey;
|
|
|
|
PKIX_CHECK(PKIX_PL_OID_Create
|
|
(PKIX_CERTKEYUSAGE_OID,
|
|
&keyUsageOID,
|
|
plContext),
|
|
PKIX_OIDCREATEFAILED);
|
|
|
|
state->keyUsageOID = keyUsageOID;
|
|
keyUsageOID = NULL;
|
|
|
|
*pCheckerState = state;
|
|
state = NULL;
|
|
|
|
cleanup:
|
|
|
|
PKIX_DECREF(keyUsageOID);
|
|
PKIX_DECREF(state);
|
|
|
|
PKIX_RETURN(SIGNATURECHECKERSTATE);
|
|
}
|
|
|
|
/* --Private-Functions-------------------------------------------- */
|
|
|
|
/*
|
|
* FUNCTION: pkix_SignatureChecker_Check
|
|
* (see comments for PKIX_CertChainChecker_CheckCallback in pkix_checker.h)
|
|
*/
|
|
PKIX_Error *
|
|
pkix_SignatureChecker_Check(
|
|
PKIX_CertChainChecker *checker,
|
|
PKIX_PL_Cert *cert,
|
|
PKIX_List *unresolvedCriticalExtensions,
|
|
void **pNBIOContext,
|
|
void *plContext)
|
|
{
|
|
pkix_SignatureCheckerState *state = NULL;
|
|
PKIX_PL_PublicKey *prevPubKey = NULL;
|
|
PKIX_PL_PublicKey *currPubKey = NULL;
|
|
PKIX_PL_PublicKey *newPubKey = NULL;
|
|
PKIX_PL_PublicKey *pKey = NULL;
|
|
PKIX_PL_CertBasicConstraints *basicConstraints = NULL;
|
|
PKIX_Error *checkKeyUsageFail = NULL;
|
|
PKIX_Error *verifyFail = NULL;
|
|
PKIX_Boolean certVerified = PKIX_FALSE;
|
|
|
|
PKIX_ENTER(CERTCHAINCHECKER, "pkix_SignatureChecker_Check");
|
|
PKIX_NULLCHECK_THREE(checker, cert, pNBIOContext);
|
|
|
|
*pNBIOContext = NULL; /* we never block on pending I/O */
|
|
|
|
PKIX_CHECK(PKIX_CertChainChecker_GetCertChainCheckerState
|
|
(checker, (PKIX_PL_Object **)&state, plContext),
|
|
PKIX_CERTCHAINCHECKERGETCERTCHAINCHECKERSTATEFAILED);
|
|
|
|
(state->certsRemaining)--;
|
|
|
|
PKIX_INCREF(state->prevPublicKey);
|
|
prevPubKey = state->prevPublicKey;
|
|
|
|
/*
|
|
* Previous Cert doesn't have CertSign bit on for signature
|
|
* verification and it is not a self-issued Cert so there is no
|
|
* old key saved. This is considered error.
|
|
*/
|
|
if (state->prevCertCertSign == PKIX_FALSE &&
|
|
state->prevPublicKeyList == NULL) {
|
|
PKIX_ERROR(PKIX_KEYUSAGEKEYCERTSIGNBITNOTON);
|
|
}
|
|
|
|
/* Previous Cert is valid for signature verification, try it first */
|
|
if (state->prevCertCertSign == PKIX_TRUE) {
|
|
verifyFail = PKIX_PL_Cert_VerifySignature
|
|
(cert, prevPubKey, plContext);
|
|
if (verifyFail == NULL) {
|
|
certVerified = PKIX_TRUE;
|
|
} else {
|
|
certVerified = PKIX_FALSE;
|
|
}
|
|
}
|
|
|
|
#ifdef NIST_TEST_4_5_4_AND_4_5_6
|
|
|
|
/*
|
|
* Following codes under this compiler flag is implemented for
|
|
* special cases of NIST tests 4.5.4 and 4.5.6. We are not sure
|
|
* we should handle these two tests as what is implemented so the
|
|
* codes are commented out, and the tests fails (for now).
|
|
* For Cert chain validation, our assumption is all the Certs on
|
|
* the chain are using its previous Cert's public key to decode
|
|
* its current key. But for thses two tests, keys are used not
|
|
* in this precedent order, we can either
|
|
* 1) Use what is implemented here: take in what Cert order NIST
|
|
* specified and for continuous self-issued Certs, stacking up
|
|
* their keys and tries all of them in FILO order.
|
|
* But this method breaks the idea of chain key presdency.
|
|
* 2) Use Build Chain facility: we will specify the valid Certs
|
|
* order (means key precedency is kept) and count on Build Chain
|
|
* to get the Certs that can fill for the needed keys. This may have
|
|
* performance impact.
|
|
* 3) Fetch Certs from CertStore: we will specifiy the valid Certs
|
|
* order and use CertSelector on SubjectName to get a list of
|
|
* candidates Certs to fill in for the needed keys.
|
|
* Anyhow, the codes are kept around just in case we want to use
|
|
* solution one...
|
|
*/
|
|
|
|
/* If failed and previous key is self-issued, try its old key(s) */
|
|
if (certVerified == PKIX_FALSE && state->prevPublicKeyList != NULL) {
|
|
|
|
/* Verify from keys on the list */
|
|
PKIX_CHECK(PKIX_List_GetLength
|
|
(state->prevPublicKeyList, &numKeys, plContext),
|
|
PKIX_LISTGETLENGTHFAILED);
|
|
|
|
for (i = numKeys - 1; i >= 0; i--) {
|
|
|
|
PKIX_CHECK(PKIX_List_GetItem
|
|
(state->prevPublicKeyList,
|
|
i,
|
|
(PKIX_PL_Object **) &pKey,
|
|
plContext),
|
|
PKIX_LISTGETITEMFAILED);
|
|
|
|
PKIX_DECREF(verifyFail);
|
|
verifyFail = PKIX_PL_Cert_VerifySignature
|
|
(cert, pKey, plContext);
|
|
|
|
if (verifyFail == NULL) {
|
|
certVerified = PKIX_TRUE;
|
|
break;
|
|
} else {
|
|
certVerified = PKIX_FALSE;
|
|
}
|
|
|
|
PKIX_DECREF(pKey);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (certVerified == PKIX_FALSE) {
|
|
pkixErrorResult = verifyFail;
|
|
verifyFail = NULL;
|
|
PKIX_ERROR(PKIX_VALIDATIONFAILEDCERTSIGNATURECHECKING);
|
|
}
|
|
|
|
#ifdef NIST_TEST_4_5_4_AND_4_5_6
|
|
/*
|
|
* Check if Cert is self-issued. If so, the old key(s) is saved, in
|
|
* conjunction to the new key, for verifying CERT validity later.
|
|
*/
|
|
PKIX_CHECK(pkix_IsCertSelfIssued(cert, &selfIssued, plContext),
|
|
PKIX_ISCERTSELFISSUEFAILED);
|
|
|
|
/*
|
|
* Check if Cert is self-issued. If so, the public key of the Cert
|
|
* that issues this Cert (old key) can be used together with this
|
|
* current key (new key) for key verification. If there are multiple
|
|
* self-issued certs, keys of those Certs (old keys) can also be used
|
|
* for key verification. Old key(s) is saved in a list (PrevPublickKey-
|
|
* List) and cleared when a Cert is no longer self-issued. PrevPublic-
|
|
* Key keep key of the previous Cert.
|
|
*/
|
|
if (selfIssued == PKIX_TRUE) {
|
|
|
|
/* Make sure previous Cert is valid for signature verification */
|
|
if (state->prevCertCertSign == PKIX_TRUE) {
|
|
|
|
if (state->prevPublicKeyList == NULL) {
|
|
|
|
PKIX_CHECK(PKIX_List_Create
|
|
(&state->prevPublicKeyList, plContext),
|
|
PKIX_LISTCREATEFALIED);
|
|
|
|
}
|
|
|
|
PKIX_CHECK(PKIX_List_AppendItem
|
|
(state->prevPublicKeyList,
|
|
(PKIX_PL_Object *) state->prevPublicKey,
|
|
plContext),
|
|
PKIX_LISTAPPENDITEMFAILED);
|
|
}
|
|
|
|
} else {
|
|
/* Not self-issued Cert any more, clear old key(s) saved */
|
|
PKIX_DECREF(state->prevPublicKeyList);
|
|
}
|
|
#endif
|
|
|
|
/* Save current key as prevPublicKey */
|
|
PKIX_CHECK(PKIX_PL_Cert_GetSubjectPublicKey
|
|
(cert, &currPubKey, plContext),
|
|
PKIX_CERTGETSUBJECTPUBLICKEYFAILED);
|
|
|
|
PKIX_CHECK(PKIX_PL_PublicKey_MakeInheritedDSAPublicKey
|
|
(currPubKey, prevPubKey, &newPubKey, plContext),
|
|
PKIX_PUBLICKEYMAKEINHERITEDDSAPUBLICKEYFAILED);
|
|
|
|
if (newPubKey == NULL){
|
|
PKIX_INCREF(currPubKey);
|
|
newPubKey = currPubKey;
|
|
}
|
|
|
|
PKIX_INCREF(newPubKey);
|
|
PKIX_DECREF(state->prevPublicKey);
|
|
|
|
state->prevPublicKey = newPubKey;
|
|
|
|
/* Save this Cert key usage CertSign bit */
|
|
if (state->certsRemaining != 0) {
|
|
checkKeyUsageFail = PKIX_PL_Cert_VerifyKeyUsage
|
|
(cert, PKIX_KEY_CERT_SIGN, plContext);
|
|
|
|
state->prevCertCertSign = (checkKeyUsageFail == NULL)?
|
|
PKIX_TRUE:PKIX_FALSE;
|
|
|
|
PKIX_DECREF(checkKeyUsageFail);
|
|
}
|
|
|
|
/* Remove Key Usage Extension OID from list */
|
|
if (unresolvedCriticalExtensions != NULL) {
|
|
|
|
PKIX_CHECK(pkix_List_Remove
|
|
(unresolvedCriticalExtensions,
|
|
(PKIX_PL_Object *) state->keyUsageOID,
|
|
plContext),
|
|
PKIX_LISTREMOVEFAILED);
|
|
}
|
|
|
|
PKIX_CHECK(PKIX_CertChainChecker_SetCertChainCheckerState
|
|
(checker, (PKIX_PL_Object *)state, plContext),
|
|
PKIX_CERTCHAINCHECKERSETCERTCHAINCHECKERSTATEFAILED);
|
|
|
|
cleanup:
|
|
|
|
PKIX_DECREF(state);
|
|
PKIX_DECREF(pKey);
|
|
PKIX_DECREF(prevPubKey);
|
|
PKIX_DECREF(currPubKey);
|
|
PKIX_DECREF(newPubKey);
|
|
PKIX_DECREF(basicConstraints);
|
|
PKIX_DECREF(verifyFail);
|
|
PKIX_DECREF(checkKeyUsageFail);
|
|
|
|
PKIX_RETURN(CERTCHAINCHECKER);
|
|
|
|
}
|
|
|
|
/*
|
|
* FUNCTION: pkix_SignatureChecker_Initialize
|
|
* DESCRIPTION:
|
|
*
|
|
* Creates a new CertChainChecker and stores it at "pChecker", where it will
|
|
* be used by pkix_SignatureChecker_Check to check that the public key in
|
|
* the checker's state is able to successfully validate the certificate's
|
|
* signature. The PublicKey pointed to by "trustedPubKey" is used to
|
|
* initialize the checker's state.
|
|
*
|
|
* PARAMETERS:
|
|
* "trustedPubKey"
|
|
* Address of PublicKey representing the trusted public key used to
|
|
* initialize the state of this checker. Must be non-NULL.
|
|
* "certsRemaining"
|
|
* Number of certificates remaining in the chain.
|
|
* "pChecker"
|
|
* Address where object pointer will be stored. Must be non-NULL.
|
|
* "plContext"
|
|
* Platform-specific context pointer.
|
|
* THREAD SAFETY:
|
|
* Thread Safe (see Thread Safety Definitions in Programmer's Guide)
|
|
* RETURNS:
|
|
* Returns NULL if the function succeeds.
|
|
* Returns a CertChainChecker Error if the function fails in a non-fatal way.
|
|
* Returns a Fatal Error if the function fails in an unrecoverable way.
|
|
*/
|
|
PKIX_Error *
|
|
pkix_SignatureChecker_Initialize(
|
|
PKIX_PL_PublicKey *trustedPubKey,
|
|
PKIX_UInt32 certsRemaining,
|
|
PKIX_CertChainChecker **pChecker,
|
|
void *plContext)
|
|
{
|
|
pkix_SignatureCheckerState* state = NULL;
|
|
PKIX_ENTER(CERTCHAINCHECKER, "PKIX_SignatureChecker_Initialize");
|
|
PKIX_NULLCHECK_TWO(pChecker, trustedPubKey);
|
|
|
|
PKIX_CHECK(pkix_SignatureCheckerState_Create
|
|
(trustedPubKey, certsRemaining, &state, plContext),
|
|
PKIX_SIGNATURECHECKERSTATECREATEFAILED);
|
|
|
|
PKIX_CHECK(PKIX_CertChainChecker_Create
|
|
(pkix_SignatureChecker_Check,
|
|
PKIX_FALSE,
|
|
PKIX_FALSE,
|
|
NULL,
|
|
(PKIX_PL_Object *) state,
|
|
pChecker,
|
|
plContext),
|
|
PKIX_CERTCHAINCHECKERCREATEFAILED);
|
|
|
|
cleanup:
|
|
|
|
PKIX_DECREF(state);
|
|
|
|
PKIX_RETURN(CERTCHAINCHECKER);
|
|
|
|
}
|