/* $Id: asn1-basics.cpp $ */ /** @file * IPRT - ASN.1, Basic Operations. */ /* * Copyright (C) 2006-2022 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program 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 * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included * in the VirtualBox distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. * * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include "internal/iprt.h" #include #include #include #include #include #include #include #include /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * ASN.1 content/value allocation. * * The currently most frequent use of the RTAsn1 module is to decode ASN.1 byte * streams. In that scenario we do not allocate memory for the raw content * bytes, but share it with the byte stream. Also, a great number of RTASN1CORE * structures will never need to have any content bytes allocated with this. * * So, in order to avoid adding an extra 16 (64-bit) or 8 (32-bit) bytes to each * RTASN1CORE structure just to keep track of the occational content allocation, * we put the allocator tracking structure inside the allocation. During * allocator operations it lives temporarily on the stack. */ typedef struct RTASN1MEMCONTENT { /** The allocation tracker. */ RTASN1ALLOCATION Allocation; #if ARCH_BITS == 32 uint32_t Padding; /**< Alignment padding. */ #endif /** The content bytes, i.e. what RTASN1CORE::uData.pv points to. Use a 64-bit * type here to emphasize that it's 8-byte aligned on all platforms. */ uint64_t au64Content[1]; } RTASN1MEMCONTENT; AssertCompileMemberAlignment(RTASN1MEMCONTENT, au64Content, 8); /** Pointer to a ASN.1 content allocation. */ typedef RTASN1MEMCONTENT *PRTASN1MEMCONTENT; RTDECL(int) RTAsn1MemResizeArray(PRTASN1ARRAYALLOCATION pAllocation, void ***ppapvArray, uint32_t cCurrent, uint32_t cNew) { AssertReturn(pAllocation->pAllocator != NULL, VERR_WRONG_ORDER); AssertReturn(pAllocation->cbEntry > 0, VERR_WRONG_ORDER); AssertReturn(cCurrent <= pAllocation->cEntriesAllocated, VERR_INVALID_PARAMETER); AssertReturn(cCurrent <= pAllocation->cPointersAllocated, VERR_INVALID_PARAMETER); AssertReturn(cNew < _1M, VERR_OUT_OF_RANGE); Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated); /* * Is there sufficent space allocated already? * * We keep unused entires ZEROed, therefore we must always call the allocator * when shrinking (this also helps with the electric fence allocator). */ if (cNew <= pAllocation->cEntriesAllocated) { if (cCurrent <= cNew) return VINF_SUCCESS; pAllocation->pAllocator->pfnShrinkArray(pAllocation->pAllocator, pAllocation, ppapvArray, cCurrent, cNew); return VINF_SUCCESS; } /* * Must grow (or do initial alloc). */ pAllocation->cResizeCalls++; return pAllocation->pAllocator->pfnGrowArray(pAllocation->pAllocator, pAllocation, ppapvArray, cNew); } RTDECL(void) RTAsn1MemFreeArray(PRTASN1ARRAYALLOCATION pAllocation, void **papvArray) { Assert(pAllocation->pAllocator != NULL); if (papvArray) { pAllocation->pAllocator->pfnFreeArray(pAllocation->pAllocator, pAllocation, papvArray); Assert(pAllocation->cPointersAllocated == 0); Assert(pAllocation->cEntriesAllocated == 0); } } RTDECL(int) RTAsn1MemAllocZ(PRTASN1ALLOCATION pAllocation, void **ppvMem, size_t cbMem) { AssertReturn(pAllocation->pAllocator != NULL, VERR_WRONG_ORDER); AssertPtr(ppvMem); Assert(cbMem > 0); int rc = pAllocation->pAllocator->pfnAlloc(pAllocation->pAllocator, pAllocation, ppvMem, cbMem); Assert(pAllocation->cbAllocated >= cbMem || RT_FAILURE_NP(rc)); return rc; } RTDECL(int) RTAsn1MemDup(PRTASN1ALLOCATION pAllocation, void **ppvMem, const void *pvSrc, size_t cbMem) { AssertReturn(pAllocation->pAllocator != NULL, VERR_WRONG_ORDER); AssertPtr(ppvMem); AssertPtr(pvSrc); Assert(cbMem > 0); int rc = pAllocation->pAllocator->pfnAlloc(pAllocation->pAllocator, pAllocation, ppvMem, cbMem); if (RT_SUCCESS(rc)) { Assert(pAllocation->cbAllocated >= cbMem); memcpy(*ppvMem, pvSrc, cbMem); return VINF_SUCCESS; } return rc; } RTDECL(void) RTAsn1MemFree(PRTASN1ALLOCATION pAllocation, void *pv) { Assert(pAllocation->pAllocator != NULL); if (pv) { pAllocation->pAllocator->pfnFree(pAllocation->pAllocator, pAllocation, pv); Assert(pAllocation->cbAllocated == 0); } } RTDECL(PRTASN1ALLOCATION) RTAsn1MemInitAllocation(PRTASN1ALLOCATION pAllocation, PCRTASN1ALLOCATORVTABLE pAllocator) { pAllocation->cbAllocated = 0; pAllocation->cReallocs = 0; pAllocation->uReserved0 = 0; pAllocation->pAllocator = pAllocator; return pAllocation; } RTDECL(PRTASN1ARRAYALLOCATION) RTAsn1MemInitArrayAllocation(PRTASN1ARRAYALLOCATION pAllocation, PCRTASN1ALLOCATORVTABLE pAllocator, size_t cbEntry) { Assert(cbEntry >= sizeof(RTASN1CORE)); Assert(cbEntry < _1M); Assert(RT_ALIGN_Z(cbEntry, sizeof(void *)) == cbEntry); pAllocation->cbEntry = (uint32_t)cbEntry; pAllocation->cPointersAllocated = 0; pAllocation->cEntriesAllocated = 0; pAllocation->cResizeCalls = 0; pAllocation->uReserved0 = 0; pAllocation->pAllocator = pAllocator; return pAllocation; } RTDECL(int) RTAsn1ContentAllocZ(PRTASN1CORE pAsn1Core, size_t cb, PCRTASN1ALLOCATORVTABLE pAllocator) { AssertReturn(pAllocator != NULL, VERR_WRONG_ORDER); AssertReturn(cb > 0 && cb < _1G, VERR_INVALID_PARAMETER); AssertPtr(pAsn1Core); AssertReturn(!(pAsn1Core->fFlags & RTASN1CORE_F_ALLOCATED_CONTENT), VERR_INVALID_STATE); /* Initialize the temporary allocation tracker. */ RTASN1ALLOCATION Allocation; Allocation.cbAllocated = 0; Allocation.cReallocs = 0; Allocation.uReserved0 = 0; Allocation.pAllocator = pAllocator; /* Make the allocation. */ uint32_t cbAlloc = RT_UOFFSETOF(RTASN1MEMCONTENT, au64Content) + (uint32_t)cb; PRTASN1MEMCONTENT pHdr; int rc = pAllocator->pfnAlloc(pAllocator, &Allocation, (void **)&pHdr, cbAlloc); if (RT_SUCCESS(rc)) { Assert(Allocation.cbAllocated >= cbAlloc); pHdr->Allocation = Allocation; pAsn1Core->cb = (uint32_t)cb; pAsn1Core->uData.pv = &pHdr->au64Content[0]; pAsn1Core->fFlags |= RTASN1CORE_F_ALLOCATED_CONTENT; } return rc; } RTDECL(int) RTAsn1ContentDup(PRTASN1CORE pAsn1Core, void const *pvSrc, size_t cbSrc, PCRTASN1ALLOCATORVTABLE pAllocator) { int rc = RTAsn1ContentAllocZ(pAsn1Core, cbSrc, pAllocator); if (RT_SUCCESS(rc)) memcpy((void *)pAsn1Core->uData.pv, pvSrc, cbSrc); return rc; } RTDECL(int) RTAsn1ContentReallocZ(PRTASN1CORE pAsn1Core, size_t cb, PCRTASN1ALLOCATORVTABLE pAllocator) { /* Validate input. */ AssertPtr(pAsn1Core); AssertReturn(cb < _1G, VERR_INVALID_PARAMETER); if (cb > 0) { /* * Case 1 - Initial allocation. */ uint32_t cbNeeded = RT_UOFFSETOF(RTASN1MEMCONTENT, au64Content) + (uint32_t)cb; if (!(pAsn1Core->fFlags & RTASN1CORE_F_ALLOCATED_CONTENT)) return RTAsn1ContentAllocZ(pAsn1Core, cb, pAllocator); /* Locate the header. */ PRTASN1MEMCONTENT pHdr = RT_FROM_MEMBER(pAsn1Core->uData.pv, RTASN1MEMCONTENT, au64Content); /* * Case 2 - Reallocation using the same allocator. */ if ( pHdr->Allocation.pAllocator == pAllocator || !pAllocator) { pHdr->Allocation.cReallocs++; /* Modify the allocation if necessary. */ if (pHdr->Allocation.cbAllocated < cbNeeded) { RTASN1ALLOCATION Allocation = pHdr->Allocation; int rc = Allocation.pAllocator->pfnRealloc(Allocation.pAllocator, &Allocation, pHdr, (void **)&pHdr, cbNeeded); if (RT_FAILURE(rc)) return rc; Assert(Allocation.cbAllocated >= cbNeeded); pAsn1Core->uData.pv = &pHdr->au64Content[0]; pHdr->Allocation = Allocation; } /* Clear any additional memory we're letting the user use and update the content size. */ if (pAsn1Core->cb < cb) RT_BZERO((uint8_t *)&pAsn1Core->uData.pu8[pAsn1Core->cb], cb - pAsn1Core->cb); pAsn1Core->cb = (uint32_t)cb; } /* * Case 3 - Reallocation using a different allocator. */ else { /* Initialize the temporary allocation tracker. */ RTASN1ALLOCATION Allocation; Allocation.cbAllocated = 0; Allocation.cReallocs = pHdr->Allocation.cReallocs + 1; Allocation.uReserved0 = 0; Allocation.pAllocator = pAllocator; /* Make the allocation. */ PRTASN1MEMCONTENT pHdrNew; int rc = pAllocator->pfnAlloc(pAllocator, &Allocation, (void **)&pHdrNew, cbNeeded); if (RT_FAILURE(rc)) return rc; Assert(Allocation.cbAllocated >= cbNeeded); /* Duplicate the old content and zero any new memory we might've added. */ if (pAsn1Core->cb >= cb) memcpy(&pHdrNew->au64Content[0], &pHdr->au64Content[0], cb); else { memcpy(&pHdrNew->au64Content[0], &pHdr->au64Content[0], pAsn1Core->cb); RT_BZERO((uint8_t *)&pHdrNew->au64Content[0] + pAsn1Core->cb, cb - pAsn1Core->cb); } /* Update the core. */ pHdrNew->Allocation = Allocation; pAsn1Core->uData.pv = &pHdrNew->au64Content[0]; pAsn1Core->fFlags |= RTASN1CORE_F_ALLOCATED_CONTENT; /* free cleared it. */ pAsn1Core->cb = (uint32_t)cb; /* Free the old content. */ Allocation = pHdr->Allocation; Allocation.pAllocator->pfnFree(Allocation.pAllocator, &Allocation, pHdr); Assert(Allocation.cbAllocated == 0); } } /* * Case 4 - It's a request to free the memory. */ else RTAsn1ContentFree(pAsn1Core); return VINF_SUCCESS; } RTDECL(void) RTAsn1ContentFree(PRTASN1CORE pAsn1Core) { if (pAsn1Core) { pAsn1Core->cb = 0; if (pAsn1Core->fFlags & RTASN1CORE_F_ALLOCATED_CONTENT) { pAsn1Core->fFlags &= ~RTASN1CORE_F_ALLOCATED_CONTENT; AssertReturnVoid(pAsn1Core->uData.pv); PRTASN1MEMCONTENT pHdr = RT_FROM_MEMBER(pAsn1Core->uData.pv, RTASN1MEMCONTENT, au64Content); RTASN1ALLOCATION Allocation = pHdr->Allocation; Allocation.pAllocator->pfnFree(Allocation.pAllocator, &Allocation, pHdr); Assert(Allocation.cbAllocated == 0); } pAsn1Core->uData.pv = NULL; } } /* * Virtual method table based API. */ RTDECL(void) RTAsn1VtDelete(PRTASN1CORE pThisCore) { if (pThisCore) { PCRTASN1COREVTABLE pOps = pThisCore->pOps; if (pOps) pOps->pfnDtor(pThisCore); } } /** * Context data passed by RTAsn1VtDeepEnum to it's worker callbacks. */ typedef struct RTASN1DEEPENUMCTX { PFNRTASN1ENUMCALLBACK pfnCallback; void *pvUser; } RTASN1DEEPENUMCTX; static DECLCALLBACK(int) rtAsn1VtDeepEnumDepthFirst(PRTASN1CORE pThisCore, const char *pszName, uint32_t uDepth, void *pvUser) { AssertReturn(pThisCore, VINF_SUCCESS); if (pThisCore->pOps && pThisCore->pOps->pfnEnum) { int rc = pThisCore->pOps->pfnEnum(pThisCore, rtAsn1VtDeepEnumDepthFirst, uDepth, pvUser); if (rc != VINF_SUCCESS) return rc; } RTASN1DEEPENUMCTX *pCtx = (RTASN1DEEPENUMCTX *)pvUser; return pCtx->pfnCallback(pThisCore, pszName, uDepth, pCtx->pvUser); } static DECLCALLBACK(int) rtAsn1VtDeepEnumDepthLast(PRTASN1CORE pThisCore, const char *pszName, uint32_t uDepth, void *pvUser) { AssertReturn(pThisCore, VINF_SUCCESS); RTASN1DEEPENUMCTX *pCtx = (RTASN1DEEPENUMCTX *)pvUser; int rc = pCtx->pfnCallback(pThisCore, pszName, uDepth, pCtx->pvUser); if (rc == VINF_SUCCESS) { if (pThisCore->pOps && pThisCore->pOps->pfnEnum) rc = pThisCore->pOps->pfnEnum(pThisCore, rtAsn1VtDeepEnumDepthFirst, uDepth, pvUser); } return rc; } RTDECL(int) RTAsn1VtDeepEnum(PRTASN1CORE pThisCore, bool fDepthFirst, uint32_t uDepth, PFNRTASN1ENUMCALLBACK pfnCallback, void *pvUser) { int rc; if (RTAsn1Core_IsPresent(pThisCore)) { PCRTASN1COREVTABLE pOps = pThisCore->pOps; if (pOps && pOps->pfnEnum) { RTASN1DEEPENUMCTX Ctx; Ctx.pfnCallback = pfnCallback; Ctx.pvUser = pvUser; rc = pOps->pfnEnum(pThisCore, fDepthFirst ? rtAsn1VtDeepEnumDepthFirst : rtAsn1VtDeepEnumDepthLast, uDepth, &Ctx); } else rc = VINF_SUCCESS; } else rc = VINF_SUCCESS; return rc; } RTDECL(int) RTAsn1VtClone(PRTASN1CORE pThisCore, PRTASN1CORE pSrcCore, PCRTASN1ALLOCATORVTABLE pAllocator) { AssertPtrReturn(pThisCore, VERR_INVALID_POINTER); AssertPtrReturn(pSrcCore, VERR_INVALID_POINTER); AssertPtrReturn(pAllocator, VERR_INVALID_POINTER); if (RTAsn1Core_IsPresent(pSrcCore)) { AssertPtrReturn(pSrcCore->pOps, VERR_INVALID_POINTER); AssertPtr(pSrcCore->pOps->pfnClone); return pSrcCore->pOps->pfnClone(pThisCore, pSrcCore, pAllocator); } RT_ZERO(*pThisCore); return VINF_SUCCESS; } RTDECL(int) RTAsn1VtCompare(PCRTASN1CORE pLeftCore, PCRTASN1CORE pRightCore) { int iDiff; if (RTAsn1Core_IsPresent(pLeftCore)) { if (RTAsn1Core_IsPresent(pRightCore)) { PCRTASN1COREVTABLE pOps = pLeftCore->pOps; if (pOps == pRightCore->pOps) { AssertPtr(pOps->pfnCompare); iDiff = pOps->pfnCompare(pLeftCore, pRightCore); } else iDiff = (uintptr_t)pOps < (uintptr_t)pRightCore->pOps ? -1 : 1; } else iDiff = 1; } else iDiff = 0 - (int)RTAsn1Core_IsPresent(pRightCore); return iDiff; } RTDECL(int) RTAsn1VtCheckSanity(PCRTASN1CORE pThisCore, uint32_t fFlags, PRTERRINFO pErrInfo, const char *pszErrorTag) { int rc; if (RTAsn1Core_IsPresent(pThisCore)) { PCRTASN1COREVTABLE pOps = pThisCore->pOps; if (pOps && pOps->pfnCheckSanity) rc = pOps->pfnCheckSanity(pThisCore, fFlags, pErrInfo, pszErrorTag); else if (pOps) rc = RTErrInfoSetF(pErrInfo, VERR_ASN1_NO_CHECK_SANITY_METHOD, "%s: Has no pfnCheckSanity function.", pszErrorTag); else rc = RTErrInfoSetF(pErrInfo, VERR_ASN1_NO_VTABLE, "%s: Has no Vtable function.", pszErrorTag); } else rc = RTErrInfoSetF(pErrInfo, VERR_ASN1_NOT_PRESENT, "%s: Not present.", pszErrorTag); return rc; } /* * Dummy ASN.1 object. */ RTDECL(int) RTAsn1Dummy_InitEx(PRTASN1DUMMY pThis) { return RTAsn1Core_InitEx(&pThis->Asn1Core, UINT32_MAX, ASN1_TAGCLASS_PRIVATE | ASN1_TAGFLAG_CONSTRUCTED, NULL, RTASN1CORE_F_DUMMY); } /* * ASN.1 SEQUENCE OF object. */ RTDECL(int) RTAsn1SeqOfCore_Init(PRTASN1SEQOFCORE pThis, PCRTASN1COREVTABLE pVtable) { return RTAsn1Core_InitEx(&pThis->Asn1Core, ASN1_TAG_SEQUENCE, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED, pVtable, RTASN1CORE_F_PRESENT); } RTDECL(int) RTAsn1SeqOfCore_Clone(PRTASN1SEQOFCORE pThis, PCRTASN1COREVTABLE pVtable, PCRTASN1SEQOFCORE pSrc) { AssertReturn(pSrc->Asn1Core.pOps == pVtable, VERR_ASN1_INTERNAL_ERROR_5); return RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core); } /* * ASN.1 SET OF object. */ RTDECL(int) RTAsn1SetOfCore_Init(PRTASN1SETOFCORE pThis, PCRTASN1COREVTABLE pVtable) { return RTAsn1Core_InitEx(&pThis->Asn1Core, ASN1_TAG_SET, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED, pVtable, RTASN1CORE_F_PRESENT); } RTDECL(int) RTAsn1SetOfCore_Clone(PRTASN1SETOFCORE pThis, PCRTASN1COREVTABLE pVtable, PCRTASN1SETOFCORE pSrc) { AssertReturn(pSrc->Asn1Core.pOps == pVtable, VERR_ASN1_INTERNAL_ERROR_5); return RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core); } /* * ASN.1 SEQUENCE object. */ RTDECL(int) RTAsn1SequenceCore_Init(PRTASN1SEQUENCECORE pThis, PCRTASN1COREVTABLE pVtable) { return RTAsn1Core_InitEx(&pThis->Asn1Core, ASN1_TAG_SEQUENCE, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED, pVtable, RTASN1CORE_F_PRESENT); } RTDECL(int) RTAsn1SequenceCore_Clone(PRTASN1SEQUENCECORE pThis, PCRTASN1COREVTABLE pVtable, PCRTASN1SEQUENCECORE pSrc) { AssertReturn(pSrc->Asn1Core.pOps == pVtable, VERR_ASN1_INTERNAL_ERROR_5); return RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core); } /* * ASN.1 SEQUENCE object - only used by SPC, so probably doing something wrong there. */ RTDECL(int) RTAsn1SetCore_Init(PRTASN1SETCORE pThis, PCRTASN1COREVTABLE pVtable) { return RTAsn1Core_InitEx(&pThis->Asn1Core, ASN1_TAG_SET, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED, pVtable, RTASN1CORE_F_PRESENT); } RTDECL(int) RTAsn1SetCore_Clone(PRTASN1SETCORE pThis, PCRTASN1COREVTABLE pVtable, PCRTASN1SETCORE pSrc) { AssertReturn(pSrc->Asn1Core.pOps == pVtable, VERR_ASN1_INTERNAL_ERROR_5); return RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core); } /* * ASN.1 Context Tag object. */ RTDECL(int) RTAsn1ContextTagN_Init(PRTASN1CONTEXTTAG pThis, uint32_t uTag, PCRTASN1COREVTABLE pVtable) { return RTAsn1Core_InitEx(&pThis->Asn1Core, uTag, ASN1_TAGCLASS_CONTEXT | ASN1_TAGFLAG_CONSTRUCTED, pVtable, RTASN1CORE_F_PRESENT); } RTDECL(int) RTAsn1ContextTagN_Clone(PRTASN1CONTEXTTAG pThis, PCRTASN1CONTEXTTAG pSrc, uint32_t uTag) { Assert(pSrc->Asn1Core.uTag == uTag || !RTASN1CORE_IS_PRESENT(&pSrc->Asn1Core)); RT_NOREF_PV(uTag); return RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core); }