serialize.c

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/*
 * Copyright 2004-2006 Juan Lang
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "wine/debug.h"
#include "excpt.h"
#include "wine/exception.h"
#include "crypt32_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(crypt);

/* Some typedefs that make it easier to abstract which type of context we're
 * working with.
 */
typedef const void *(WINAPI *CreateContextFunc)(DWORD dwCertEncodingType,
 const BYTE *pbCertEncoded, DWORD cbCertEncoded);
typedef BOOL (WINAPI *AddContextToStoreFunc)(HCERTSTORE hCertStore,
 const void *context, DWORD dwAddDisposition, const void **ppStoreContext);
typedef BOOL (WINAPI *AddEncodedContextToStoreFunc)(HCERTSTORE hCertStore,
 DWORD dwCertEncodingType, const BYTE *pbEncoded, DWORD cbEncoded,
 DWORD dwAddDisposition, const void **ppContext);
typedef const void *(WINAPI *EnumContextsInStoreFunc)(HCERTSTORE hCertStore,
 const void *pPrevContext);
typedef BOOL (WINAPI *GetContextPropertyFunc)(const void *context,
 DWORD dwPropID, void *pvData, DWORD *pcbData);
typedef BOOL (WINAPI *SetContextPropertyFunc)(const void *context,
 DWORD dwPropID, DWORD dwFlags, const void *pvData);
typedef BOOL (WINAPI *SerializeElementFunc)(const void *context, DWORD dwFlags,
 BYTE *pbElement, DWORD *pcbElement);
typedef BOOL (WINAPI *FreeContextFunc)(const void *context);
typedef BOOL (WINAPI *DeleteContextFunc)(const void *context);

/* An abstract context (certificate, CRL, or CTL) interface */
typedef struct _WINE_CONTEXT_INTERFACE
{
    CreateContextFunc            create;
    AddContextToStoreFunc        addContextToStore;
    AddEncodedContextToStoreFunc addEncodedToStore;
    EnumContextsInStoreFunc      enumContextsInStore;
    GetContextPropertyFunc       getProp;
    SetContextPropertyFunc       setProp;
    SerializeElementFunc         serialize;
    FreeContextFunc              free;
    DeleteContextFunc            deleteFromStore;
} WINE_CONTEXT_INTERFACE, *PWINE_CONTEXT_INTERFACE;

static const WINE_CONTEXT_INTERFACE gCertInterface = {
    (CreateContextFunc)CertCreateCertificateContext,
    (AddContextToStoreFunc)CertAddCertificateContextToStore,
    (AddEncodedContextToStoreFunc)CertAddEncodedCertificateToStore,
    (EnumContextsInStoreFunc)CertEnumCertificatesInStore,
    (GetContextPropertyFunc)CertGetCertificateContextProperty,
    (SetContextPropertyFunc)CertSetCertificateContextProperty,
    (SerializeElementFunc)CertSerializeCertificateStoreElement,
    (FreeContextFunc)CertFreeCertificateContext,
    (DeleteContextFunc)CertDeleteCertificateFromStore,
};

static const WINE_CONTEXT_INTERFACE gCRLInterface = {
    (CreateContextFunc)CertCreateCRLContext,
    (AddContextToStoreFunc)CertAddCRLContextToStore,
    (AddEncodedContextToStoreFunc)CertAddEncodedCRLToStore,
    (EnumContextsInStoreFunc)CertEnumCRLsInStore,
    (GetContextPropertyFunc)CertGetCRLContextProperty,
    (SetContextPropertyFunc)CertSetCRLContextProperty,
    (SerializeElementFunc)CertSerializeCRLStoreElement,
    (FreeContextFunc)CertFreeCRLContext,
    (DeleteContextFunc)CertDeleteCRLFromStore,
};

static const WINE_CONTEXT_INTERFACE gCTLInterface = {
    (CreateContextFunc)CertCreateCTLContext,
    (AddContextToStoreFunc)CertAddCTLContextToStore,
    (AddEncodedContextToStoreFunc)CertAddEncodedCTLToStore,
    (EnumContextsInStoreFunc)CertEnumCTLsInStore,
    (GetContextPropertyFunc)CertGetCTLContextProperty,
    (SetContextPropertyFunc)CertSetCTLContextProperty,
    (SerializeElementFunc)CertSerializeCTLStoreElement,
    (FreeContextFunc)CertFreeCTLContext,
    (DeleteContextFunc)CertDeleteCTLFromStore,
};

/* An extended certificate property in serialized form is prefixed by this
 * header.
 */
typedef struct _WINE_CERT_PROP_HEADER
{
    DWORD propID;
    DWORD unknown; /* always 1 */
    DWORD cb;
} WINE_CERT_PROP_HEADER, *PWINE_CERT_PROP_HEADER;

BOOL WINAPI CertSerializeCRLStoreElement(PCCRL_CONTEXT pCrlContext,
 DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
{
    FIXME("(%p, %08lx, %p, %p): stub\n", pCrlContext, dwFlags, pbElement,
     pcbElement);
    return FALSE;
}

BOOL WINAPI CertSerializeCTLStoreElement(PCCTL_CONTEXT pCtlContext,
 DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
{
    FIXME("(%p, %08lx, %p, %p): stub\n", pCtlContext, dwFlags, pbElement,
     pcbElement);
    return FALSE;
}

BOOL WINAPI CertSerializeCertificateStoreElement(PCCERT_CONTEXT pCertContext,
 DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
{
    BOOL ret;

    TRACE("(%p, %08lx, %p, %p)\n", pCertContext, dwFlags, pbElement,
     pcbElement);

    if (pCertContext)
    {
        DWORD bytesNeeded = sizeof(WINE_CERT_PROP_HEADER) +
         pCertContext->cbCertEncoded;
        DWORD prop = 0;

        ret = TRUE;
        do {
            prop = CertEnumCertificateContextProperties(pCertContext, prop);
            if (prop)
            {
                DWORD propSize = 0;

                ret = CertGetCertificateContextProperty(pCertContext,
                 prop, NULL, &propSize);
                if (ret)
                    bytesNeeded += sizeof(WINE_CERT_PROP_HEADER) + propSize;
            }
        } while (ret && prop != 0);

        if (!pbElement)
        {
            *pcbElement = bytesNeeded;
            ret = TRUE;
        }
        else if (*pcbElement < bytesNeeded)
        {
            *pcbElement = bytesNeeded;
            SetLastError(ERROR_MORE_DATA);
            ret = FALSE;
        }
        else
        {
            PWINE_CERT_PROP_HEADER hdr;
            DWORD bufSize = 0;
            LPBYTE buf = NULL;

            prop = 0;
            do {
                prop = CertEnumCertificateContextProperties(pCertContext, prop);
                if (prop)
                {
                    DWORD propSize = 0;

                    ret = CertGetCertificateContextProperty(pCertContext,
                     prop, NULL, &propSize);
                    if (ret)
                    {
                        if (bufSize < propSize)
                        {
                            if (buf)
                                buf = CryptMemRealloc(buf, propSize);
                            else
                                buf = CryptMemAlloc(propSize);
                            bufSize = propSize;
                        }
                        if (buf)
                        {
                            ret = CertGetCertificateContextProperty(
                             pCertContext, prop, buf, &propSize);
                            if (ret)
                            {
                                hdr = (PWINE_CERT_PROP_HEADER)pbElement;
                                hdr->propID = prop;
                                hdr->unknown = 1;
                                hdr->cb = propSize;
                                pbElement += sizeof(WINE_CERT_PROP_HEADER);
                                if (propSize)
                                {
                                    memcpy(pbElement, buf, propSize);
                                    pbElement += propSize;
                                }
                            }
                        }
                        else
                            ret = FALSE;
                    }
                }
            } while (ret && prop != 0);
            CryptMemFree(buf);

            hdr = (PWINE_CERT_PROP_HEADER)pbElement;
            hdr->propID = CERT_CERT_PROP_ID;
            hdr->unknown = 1;
            hdr->cb = pCertContext->cbCertEncoded;
            memcpy(pbElement + sizeof(WINE_CERT_PROP_HEADER),
             pCertContext->pbCertEncoded, pCertContext->cbCertEncoded);
        }
    }
    else
        ret = FALSE;
    return ret;
}

/* Looks for the property with ID propID in the buffer buf.  Returns a pointer
 * to its header if a valid header is found, NULL if not.  Valid means the
 * length of thte property won't overrun buf, and the unknown field is 1.
 */
static const WINE_CERT_PROP_HEADER *CRYPT_findPropID(const BYTE *buf,
 DWORD size, DWORD propID)
{
    const WINE_CERT_PROP_HEADER *ret = NULL;
    BOOL done = FALSE;

    while (size && !ret && !done)
    {
        if (size < sizeof(WINE_CERT_PROP_HEADER))
        {
            SetLastError(CRYPT_E_FILE_ERROR);
            done = TRUE;
        }
        else
        {
            const WINE_CERT_PROP_HEADER *hdr =
             (const WINE_CERT_PROP_HEADER *)buf;

            size -= sizeof(WINE_CERT_PROP_HEADER);
            buf += sizeof(WINE_CERT_PROP_HEADER);
            if (size < hdr->cb)
            {
                SetLastError(HRESULT_FROM_WIN32(ERROR_INVALID_PARAMETER));
                done = TRUE;
            }
            else if (!hdr->propID)
            {