lib/ckfw/sessobj.c
author J.C. Jones <jjones@mozilla.com>
Fri, 21 Jun 2019 14:39:01 -0700
branchNSS_3_36_BRANCH
changeset 15182 de60f2b7f0c3fac0537346f1077f03d6d849edc5
parent 11940 0e6e8153513e40154dc1907c2aff318b5342e73e
permissions -rw-r--r--
Added tag NSS_3_36_8_RTM for changeset df8917878ea6

/* 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/. */

/*
 * sessobj.c
 *
 * This file contains an NSSCKMDObject implementation for session
 * objects.  The framework uses this implementation to manage
 * session objects when a Module doesn't wish to be bothered.
 */

#ifndef CK_T
#include "ck.h"
#endif /* CK_T */

/*
 * nssCKMDSessionObject
 *
 *  -- create --
 *  nssCKMDSessionObject_Create
 *
 *  -- EPV calls --
 *  nss_ckmdSessionObject_Finalize
 *  nss_ckmdSessionObject_IsTokenObject
 *  nss_ckmdSessionObject_GetAttributeCount
 *  nss_ckmdSessionObject_GetAttributeTypes
 *  nss_ckmdSessionObject_GetAttributeSize
 *  nss_ckmdSessionObject_GetAttribute
 *  nss_ckmdSessionObject_SetAttribute
 *  nss_ckmdSessionObject_GetObjectSize
 */

struct nssCKMDSessionObjectStr {
    CK_ULONG n;
    NSSArena *arena;
    NSSItem *attributes;
    CK_ATTRIBUTE_TYPE_PTR types;
    nssCKFWHash *hash;
};
typedef struct nssCKMDSessionObjectStr nssCKMDSessionObject;

#ifdef DEBUG
/*
 * But first, the pointer-tracking stuff.
 *
 * NOTE: the pointer-tracking support in NSS/base currently relies
 * upon NSPR's CallOnce support.  That, however, relies upon NSPR's
 * locking, which is tied into the runtime.  We need a pointer-tracker
 * implementation that uses the locks supplied through C_Initialize.
 * That support, however, can be filled in later.  So for now, I'll
 * just do this routines as no-ops.
 */

static CK_RV
nss_ckmdSessionObject_add_pointer(
    const NSSCKMDObject *mdObject)
{
    return CKR_OK;
}

static CK_RV
nss_ckmdSessionObject_remove_pointer(
    const NSSCKMDObject *mdObject)
{
    return CKR_OK;
}

#ifdef NSS_DEBUG
static CK_RV
nss_ckmdSessionObject_verifyPointer(
    const NSSCKMDObject *mdObject)
{
    return CKR_OK;
}
#endif

#endif /* DEBUG */

/*
 * We must forward-declare these routines
 */
static void
nss_ckmdSessionObject_Finalize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance);

static CK_RV
nss_ckmdSessionObject_Destroy(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance);

static CK_BBOOL
nss_ckmdSessionObject_IsTokenObject(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance);

static CK_ULONG
nss_ckmdSessionObject_GetAttributeCount(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError);

static CK_RV
nss_ckmdSessionObject_GetAttributeTypes(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE_PTR typeArray,
    CK_ULONG ulCount);

static CK_ULONG
nss_ckmdSessionObject_GetAttributeSize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError);

static NSSCKFWItem
nss_ckmdSessionObject_GetAttribute(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError);

static CK_RV
nss_ckmdSessionObject_SetAttribute(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    NSSItem *value);

static CK_ULONG
nss_ckmdSessionObject_GetObjectSize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError);

/*
 * nssCKMDSessionObject_Create
 *
 */
NSS_IMPLEMENT NSSCKMDObject *
nssCKMDSessionObject_Create(
    NSSCKFWToken *fwToken,
    NSSArena *arena,
    CK_ATTRIBUTE_PTR attributes,
    CK_ULONG ulCount,
    CK_RV *pError)
{
    NSSCKMDObject *mdObject = (NSSCKMDObject *)NULL;
    nssCKMDSessionObject *mdso = (nssCKMDSessionObject *)NULL;
    CK_ULONG i;
    nssCKFWHash *hash;

    *pError = CKR_OK;

    mdso = nss_ZNEW(arena, nssCKMDSessionObject);
    if (!mdso) {
        goto loser;
    }

    mdso->arena = arena;
    mdso->n = ulCount;
    mdso->attributes = nss_ZNEWARRAY(arena, NSSItem, ulCount);
    if (!mdso->attributes) {
        goto loser;
    }

    mdso->types = nss_ZNEWARRAY(arena, CK_ATTRIBUTE_TYPE, ulCount);
    if (!mdso->types) {
        goto loser;
    }
    for (i = 0; i < ulCount; i++) {
        mdso->types[i] = attributes[i].type;
        mdso->attributes[i].size = attributes[i].ulValueLen;
        mdso->attributes[i].data = nss_ZAlloc(arena, attributes[i].ulValueLen);
        if (!mdso->attributes[i].data) {
            goto loser;
        }
        (void)nsslibc_memcpy(mdso->attributes[i].data, attributes[i].pValue,
                             attributes[i].ulValueLen);
    }

    mdObject = nss_ZNEW(arena, NSSCKMDObject);
    if (!mdObject) {
        goto loser;
    }

    mdObject->etc = (void *)mdso;
    mdObject->Finalize = nss_ckmdSessionObject_Finalize;
    mdObject->Destroy = nss_ckmdSessionObject_Destroy;
    mdObject->IsTokenObject = nss_ckmdSessionObject_IsTokenObject;
    mdObject->GetAttributeCount = nss_ckmdSessionObject_GetAttributeCount;
    mdObject->GetAttributeTypes = nss_ckmdSessionObject_GetAttributeTypes;
    mdObject->GetAttributeSize = nss_ckmdSessionObject_GetAttributeSize;
    mdObject->GetAttribute = nss_ckmdSessionObject_GetAttribute;
    mdObject->SetAttribute = nss_ckmdSessionObject_SetAttribute;
    mdObject->GetObjectSize = nss_ckmdSessionObject_GetObjectSize;

    hash = nssCKFWToken_GetSessionObjectHash(fwToken);
    if (!hash) {
        *pError = CKR_GENERAL_ERROR;
        goto loser;
    }

    mdso->hash = hash;

    *pError = nssCKFWHash_Add(hash, mdObject, mdObject);
    if (CKR_OK != *pError) {
        goto loser;
    }

#ifdef DEBUG
    if ((*pError = nss_ckmdSessionObject_add_pointer(mdObject)) != CKR_OK) {
        goto loser;
    }
#endif /* DEBUG */

    return mdObject;

loser:
    if (mdso) {
        if (mdso->attributes) {
            for (i = 0; i < ulCount; i++) {
                nss_ZFreeIf(mdso->attributes[i].data);
            }
            nss_ZFreeIf(mdso->attributes);
        }
        nss_ZFreeIf(mdso->types);
        nss_ZFreeIf(mdso);
    }

    nss_ZFreeIf(mdObject);
    if (*pError == CKR_OK) {
        *pError = CKR_HOST_MEMORY;
    }
    return (NSSCKMDObject *)NULL;
}

/*
 * nss_ckmdSessionObject_Finalize
 *
 */
static void
nss_ckmdSessionObject_Finalize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance)
{
    /* This shouldn't ever be called */
    return;
}

/*
 * nss_ckmdSessionObject_Destroy
 *
 */

static CK_RV
nss_ckmdSessionObject_Destroy(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance)
{
#ifdef NSSDEBUG
    CK_RV error = CKR_OK;
#endif /* NSSDEBUG */
    nssCKMDSessionObject *mdso;
    CK_ULONG i;

#ifdef NSSDEBUG
    error = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != error) {
        return error;
    }
#endif /* NSSDEBUG */

    mdso = (nssCKMDSessionObject *)mdObject->etc;

    nssCKFWHash_Remove(mdso->hash, mdObject);

    for (i = 0; i < mdso->n; i++) {
        nss_ZFreeIf(mdso->attributes[i].data);
    }
    nss_ZFreeIf(mdso->attributes);
    nss_ZFreeIf(mdso->types);
    nss_ZFreeIf(mdso);
    nss_ZFreeIf(mdObject);

#ifdef DEBUG
    (void)nss_ckmdSessionObject_remove_pointer(mdObject);
#endif /* DEBUG */

    return CKR_OK;
}

/*
 * nss_ckmdSessionObject_IsTokenObject
 *
 */

static CK_BBOOL
nss_ckmdSessionObject_IsTokenObject(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance)
{
#ifdef NSSDEBUG
    if (CKR_OK != nss_ckmdSessionObject_verifyPointer(mdObject)) {
        return CK_FALSE;
    }
#endif /* NSSDEBUG */

    /*
     * This implementation is only ever used for session objects.
     */
    return CK_FALSE;
}

/*
 * nss_ckmdSessionObject_GetAttributeCount
 *
 */
static CK_ULONG
nss_ckmdSessionObject_GetAttributeCount(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError)
{
    nssCKMDSessionObject *obj;

#ifdef NSSDEBUG
    if (!pError) {
        return 0;
    }

    *pError = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != *pError) {
        return 0;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    return obj->n;
}

/*
 * nss_ckmdSessionObject_GetAttributeTypes
 *
 */
static CK_RV
nss_ckmdSessionObject_GetAttributeTypes(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE_PTR typeArray,
    CK_ULONG ulCount)
{
#ifdef NSSDEBUG
    CK_RV error = CKR_OK;
#endif /* NSSDEBUG */
    nssCKMDSessionObject *obj;

#ifdef NSSDEBUG
    error = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != error) {
        return error;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    if (ulCount < obj->n) {
        return CKR_BUFFER_TOO_SMALL;
    }

    (void)nsslibc_memcpy(typeArray, obj->types,
                         sizeof(CK_ATTRIBUTE_TYPE) *
                             obj->n);

    return CKR_OK;
}

/*
 * nss_ckmdSessionObject_GetAttributeSize
 *
 */
static CK_ULONG
nss_ckmdSessionObject_GetAttributeSize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError)
{
    nssCKMDSessionObject *obj;
    CK_ULONG i;

#ifdef NSSDEBUG
    if (!pError) {
        return 0;
    }

    *pError = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != *pError) {
        return 0;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    for (i = 0; i < obj->n; i++) {
        if (attribute == obj->types[i]) {
            return (CK_ULONG)(obj->attributes[i].size);
        }
    }

    *pError = CKR_ATTRIBUTE_TYPE_INVALID;
    return 0;
}

/*
 * nss_ckmdSessionObject_GetAttribute
 *
 */
static NSSCKFWItem
nss_ckmdSessionObject_GetAttribute(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError)
{
    NSSCKFWItem item;
    nssCKMDSessionObject *obj;
    CK_ULONG i;

    item.needsFreeing = PR_FALSE;
    item.item = NULL;
#ifdef NSSDEBUG
    if (!pError) {
        return item;
    }

    *pError = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != *pError) {
        return item;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    for (i = 0; i < obj->n; i++) {
        if (attribute == obj->types[i]) {
            item.item = &obj->attributes[i];
            return item;
        }
    }

    *pError = CKR_ATTRIBUTE_TYPE_INVALID;
    return item;
}

/*
 * nss_ckmdSessionObject_SetAttribute
 *
 */

/*
 * Okay, so this implementation sucks.  It doesn't support removing
 * an attribute (if value == NULL), and could be more graceful about
 * memory.  It should allow "blank" slots in the arrays, with some
 * invalid attribute type, and then it could support removal much
 * more easily.  Do this later.
 */
static CK_RV
nss_ckmdSessionObject_SetAttribute(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    NSSItem *value)
{
    nssCKMDSessionObject *obj;
    CK_ULONG i;
    NSSItem n;
    NSSItem *ra;
    CK_ATTRIBUTE_TYPE_PTR rt;
#ifdef NSSDEBUG
    CK_RV error;
#endif /* NSSDEBUG */

#ifdef NSSDEBUG
    error = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != error) {
        return 0;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    n.size = value->size;
    n.data = nss_ZAlloc(obj->arena, n.size);
    if (!n.data) {
        return CKR_HOST_MEMORY;
    }
    (void)nsslibc_memcpy(n.data, value->data, n.size);

    for (i = 0; i < obj->n; i++) {
        if (attribute == obj->types[i]) {
            nss_ZFreeIf(obj->attributes[i].data);
            obj->attributes[i] = n;
            return CKR_OK;
        }
    }

    /*
     * It's new.
     */

    ra = (NSSItem *)nss_ZRealloc(obj->attributes, sizeof(NSSItem) * (obj->n + 1));
    if (!ra) {
        nss_ZFreeIf(n.data);
        return CKR_HOST_MEMORY;
    }
    obj->attributes = ra;

    rt = (CK_ATTRIBUTE_TYPE_PTR)nss_ZRealloc(obj->types,
                                             sizeof(CK_ATTRIBUTE_TYPE) * (obj->n + 1));
    if (!rt) {
        nss_ZFreeIf(n.data);
        return CKR_HOST_MEMORY;
    }

    obj->types = rt;
    obj->attributes[obj->n] = n;
    obj->types[obj->n] = attribute;
    obj->n++;

    return CKR_OK;
}

/*
 * nss_ckmdSessionObject_GetObjectSize
 *
 */
static CK_ULONG
nss_ckmdSessionObject_GetObjectSize(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError)
{
    nssCKMDSessionObject *obj;
    CK_ULONG i;
    CK_ULONG rv = (CK_ULONG)0;

#ifdef NSSDEBUG
    if (!pError) {
        return 0;
    }

    *pError = nss_ckmdSessionObject_verifyPointer(mdObject);
    if (CKR_OK != *pError) {
        return 0;
    }

/* We could even check all the other arguments, for sanity. */
#endif /* NSSDEBUG */

    obj = (nssCKMDSessionObject *)mdObject->etc;

    for (i = 0; i < obj->n; i++) {
        rv += obj->attributes[i].size;
    }

    rv += sizeof(NSSItem) * obj->n;
    rv += sizeof(CK_ATTRIBUTE_TYPE) * obj->n;
    rv += sizeof(nssCKMDSessionObject);

    return rv;
}

/*
 * nssCKMDFindSessionObjects
 *
 *  -- create --
 *  nssCKMDFindSessionObjects_Create
 *
 *  -- EPV calls --
 *  nss_ckmdFindSessionObjects_Final
 *  nss_ckmdFindSessionObjects_Next
 */

struct nodeStr {
    struct nodeStr *next;
    NSSCKMDObject *mdObject;
};

struct nssCKMDFindSessionObjectsStr {
    NSSArena *arena;
    CK_RV error;
    CK_ATTRIBUTE_PTR pTemplate;
    CK_ULONG ulCount;
    struct nodeStr *list;
    nssCKFWHash *hash;
};
typedef struct nssCKMDFindSessionObjectsStr nssCKMDFindSessionObjects;

#ifdef DEBUG
/*
 * But first, the pointer-tracking stuff.
 *
 * NOTE: the pointer-tracking support in NSS/base currently relies
 * upon NSPR's CallOnce support.  That, however, relies upon NSPR's
 * locking, which is tied into the runtime.  We need a pointer-tracker
 * implementation that uses the locks supplied through C_Initialize.
 * That support, however, can be filled in later.  So for now, I'll
 * just do this routines as no-ops.
 */

static CK_RV
nss_ckmdFindSessionObjects_add_pointer(
    const NSSCKMDFindObjects *mdFindObjects)
{
    return CKR_OK;
}

static CK_RV
nss_ckmdFindSessionObjects_remove_pointer(
    const NSSCKMDFindObjects *mdFindObjects)
{
    return CKR_OK;
}

#ifdef NSS_DEBUG
static CK_RV
nss_ckmdFindSessionObjects_verifyPointer(
    const NSSCKMDFindObjects *mdFindObjects)
{
    return CKR_OK;
}
#endif

#endif /* DEBUG */

/*
 * We must forward-declare these routines.
 */
static void
nss_ckmdFindSessionObjects_Final(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance);

static NSSCKMDObject *
nss_ckmdFindSessionObjects_Next(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSArena *arena,
    CK_RV *pError);

static CK_BBOOL
items_match(
    NSSItem *a,
    CK_VOID_PTR pValue,
    CK_ULONG ulValueLen)
{
    if (a->size != ulValueLen) {
        return CK_FALSE;
    }

    if (PR_TRUE == nsslibc_memequal(a->data, pValue, ulValueLen, (PRStatus *)NULL)) {
        return CK_TRUE;
    } else {
        return CK_FALSE;
    }
}

/*
 * Our hashtable iterator
 */
static void
findfcn(
    const void *key,
    void *value,
    void *closure)
{
    NSSCKMDObject *mdObject = (NSSCKMDObject *)value;
    nssCKMDSessionObject *mdso = (nssCKMDSessionObject *)mdObject->etc;
    nssCKMDFindSessionObjects *mdfso = (nssCKMDFindSessionObjects *)closure;
    CK_ULONG i, j;
    struct nodeStr *node;

    if (CKR_OK != mdfso->error) {
        return;
    }

    for (i = 0; i < mdfso->ulCount; i++) {
        CK_ATTRIBUTE_PTR p = &mdfso->pTemplate[i];

        for (j = 0; j < mdso->n; j++) {
            if (mdso->types[j] == p->type) {
                if (!items_match(&mdso->attributes[j], p->pValue, p->ulValueLen)) {
                    return;
                } else {
                    break;
                }
            }
        }

        if (j == mdso->n) {
            /* Attribute not found */
            return;
        }
    }

    /* Matches */
    node = nss_ZNEW(mdfso->arena, struct nodeStr);
    if ((struct nodeStr *)NULL == node) {
        mdfso->error = CKR_HOST_MEMORY;
        return;
    }

    node->mdObject = mdObject;
    node->next = mdfso->list;
    mdfso->list = node;

    return;
}

/*
 * nssCKMDFindSessionObjects_Create
 *
 */
NSS_IMPLEMENT NSSCKMDFindObjects *
nssCKMDFindSessionObjects_Create(
    NSSCKFWToken *fwToken,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulCount,
    CK_RV *pError)
{
    NSSArena *arena;
    nssCKMDFindSessionObjects *mdfso;
    nssCKFWHash *hash;
    NSSCKMDFindObjects *rv;

#ifdef NSSDEBUG
    if (!pError) {
        return (NSSCKMDFindObjects *)NULL;
    }

    *pError = nssCKFWToken_verifyPointer(fwToken);
    if (CKR_OK != *pError) {
        return (NSSCKMDFindObjects *)NULL;
    }

    if ((CK_ATTRIBUTE_PTR)NULL == pTemplate) {
        *pError = CKR_ARGUMENTS_BAD;
        return (NSSCKMDFindObjects *)NULL;
    }
#endif /* NSSDEBUG */

    *pError = CKR_OK;

    hash = nssCKFWToken_GetSessionObjectHash(fwToken);
    if (!hash) {
        *pError = CKR_GENERAL_ERROR;
        return (NSSCKMDFindObjects *)NULL;
    }

    arena = NSSArena_Create();
    if (!arena) {
        *pError = CKR_HOST_MEMORY;
        return (NSSCKMDFindObjects *)NULL;
    }

    mdfso = nss_ZNEW(arena, nssCKMDFindSessionObjects);
    if (!mdfso) {
        goto loser;
    }

    rv = nss_ZNEW(arena, NSSCKMDFindObjects);
    if (rv == NULL) {
        goto loser;
    }

    mdfso->error = CKR_OK;
    mdfso->pTemplate = pTemplate;
    mdfso->ulCount = ulCount;
    mdfso->hash = hash;

    nssCKFWHash_Iterate(hash, findfcn, mdfso);

    if (CKR_OK != mdfso->error) {
        goto loser;
    }

    rv->etc = (void *)mdfso;
    rv->Final = nss_ckmdFindSessionObjects_Final;
    rv->Next = nss_ckmdFindSessionObjects_Next;

#ifdef DEBUG
    if ((*pError = nss_ckmdFindSessionObjects_add_pointer(rv)) != CKR_OK) {
        goto loser;
    }
#endif /* DEBUG */
    mdfso->arena = arena;

    return rv;

loser:
    if (arena) {
        NSSArena_Destroy(arena);
    }
    if (*pError == CKR_OK) {
        *pError = CKR_HOST_MEMORY;
    }
    return NULL;
}

static void
nss_ckmdFindSessionObjects_Final(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance)
{
    nssCKMDFindSessionObjects *mdfso;

#ifdef NSSDEBUG
    if (CKR_OK != nss_ckmdFindSessionObjects_verifyPointer(mdFindObjects)) {
        return;
    }
#endif /* NSSDEBUG */

    mdfso = (nssCKMDFindSessionObjects *)mdFindObjects->etc;
    if (mdfso->arena)
        NSSArena_Destroy(mdfso->arena);

#ifdef DEBUG
    (void)nss_ckmdFindSessionObjects_remove_pointer(mdFindObjects);
#endif /* DEBUG */

    return;
}

static NSSCKMDObject *
nss_ckmdFindSessionObjects_Next(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSArena *arena,
    CK_RV *pError)
{
    nssCKMDFindSessionObjects *mdfso;
    NSSCKMDObject *rv = (NSSCKMDObject *)NULL;

#ifdef NSSDEBUG
    if (CKR_OK != nss_ckmdFindSessionObjects_verifyPointer(mdFindObjects)) {
        return (NSSCKMDObject *)NULL;
    }
#endif /* NSSDEBUG */

    mdfso = (nssCKMDFindSessionObjects *)mdFindObjects->etc;

    while (!rv) {
        if ((struct nodeStr *)NULL == mdfso->list) {
            *pError = CKR_OK;
            return (NSSCKMDObject *)NULL;
        }

        if (nssCKFWHash_Exists(mdfso->hash, mdfso->list->mdObject)) {
            rv = mdfso->list->mdObject;
        }

        mdfso->list = mdfso->list->next;
    }

    return rv;
}