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libreoffice/svl/source/crypto/cryptosign.cxx
Daniel Baumann 8e63e14cf6
Adding upstream version 4:25.2.3. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 16:20:04 +02:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*/
#include <sal/config.h>
#include <algorithm>
#include <svl/cryptosign.hxx>
#include <svl/sigstruct.hxx>
#include <config_crypto.h>
#if USE_CRYPTO_NSS
#include <systools/curlinit.hxx>
#endif
#include <rtl/character.hxx>
#include <rtl/strbuf.hxx>
#include <rtl/string.hxx>
#include <sal/log.hxx>
#include <tools/datetime.hxx>
#include <tools/stream.hxx>
#include <comphelper/base64.hxx>
#include <comphelper/hash.hxx>
#include <comphelper/processfactory.hxx>
#include <comphelper/random.hxx>
#include <comphelper/scopeguard.hxx>
#include <comphelper/lok.hxx>
#include <com/sun/star/security/XCertificate.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <o3tl/char16_t2wchar_t.hxx>
#if USE_CRYPTO_NSS
// NSS headers for PDF signing
#include <cert.h>
#include <keyhi.h>
#include <pk11pub.h>
#include <hasht.h>
#include <secerr.h>
#include <sechash.h>
#include <cms.h>
#include <cmst.h>
// We use curl for RFC3161 time stamp requests
#include <curl/curl.h>
#include <com/sun/star/xml/crypto/DigestID.hpp>
#include <com/sun/star/xml/crypto/NSSInitializer.hpp>
#include <mutex>
#endif
#if USE_CRYPTO_MSCAPI
// WinCrypt headers for PDF signing
// Note: this uses Windows 7 APIs and requires the relevant data types
#include <prewin.h>
#include <wincrypt.h>
#include <postwin.h>
#include <comphelper/windowserrorstring.hxx>
#endif
using namespace com::sun::star;
namespace {
#if USE_CRYPTO_NSS
char *PDFSigningPKCS7PasswordCallback(PK11SlotInfo * /*slot*/, PRBool /*retry*/, void *arg)
{
return PL_strdup(static_cast<char *>(arg));
}
// ASN.1 used in the (much simpler) time stamp request. From RFC3161
// and other sources.
/*
AlgorithmIdentifier ::= SEQUENCE {
algorithm OBJECT IDENTIFIER,
parameters ANY DEFINED BY algorithm OPTIONAL }
-- contains a value of the type
-- registered for use with the
-- algorithm object identifier value
MessageImprint ::= SEQUENCE {
hashAlgorithm AlgorithmIdentifier,
hashedMessage OCTET STRING }
*/
struct MessageImprint {
SECAlgorithmID hashAlgorithm;
SECItem hashedMessage;
};
/*
Extension ::= SEQUENCE {
extnID OBJECT IDENTIFIER,
critical BOOLEAN DEFAULT FALSE,
extnValue OCTET STRING }
*/
struct Extension {
SECItem extnID;
SECItem critical;
SECItem extnValue;
};
/*
Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*/
/*
TSAPolicyId ::= OBJECT IDENTIFIER
TimeStampReq ::= SEQUENCE {
version INTEGER { v1(1) },
messageImprint MessageImprint,
--a hash algorithm OID and the hash value of the data to be
--time-stamped
reqPolicy TSAPolicyId OPTIONAL,
nonce INTEGER OPTIONAL,
certReq BOOLEAN DEFAULT FALSE,
extensions [0] IMPLICIT Extensions OPTIONAL }
*/
struct TimeStampReq {
SECItem version;
MessageImprint messageImprint;
SECItem reqPolicy;
SECItem nonce;
SECItem certReq;
Extension *extensions;
};
/**
* General name, defined by RFC 3280.
*/
struct GeneralName
{
CERTName name;
};
/**
* List of general names (only one for now), defined by RFC 3280.
*/
struct GeneralNames
{
GeneralName names;
};
/**
* Supplies different fields to identify a certificate, defined by RFC 5035.
*/
struct IssuerSerial
{
GeneralNames issuer;
SECItem serialNumber;
};
/**
* Supplies different fields that are used to identify certificates, defined by
* RFC 5035.
*/
struct ESSCertIDv2
{
SECAlgorithmID hashAlgorithm;
SECItem certHash;
IssuerSerial issuerSerial;
};
/**
* This attribute uses the ESSCertIDv2 structure, defined by RFC 5035.
*/
struct SigningCertificateV2
{
ESSCertIDv2** certs;
SigningCertificateV2()
: certs(nullptr)
{
}
};
/**
* GeneralName ::= CHOICE {
* otherName [0] OtherName,
* rfc822Name [1] IA5String,
* dNSName [2] IA5String,
* x400Address [3] ORAddress,
* directoryName [4] Name,
* ediPartyName [5] EDIPartyName,
* uniformResourceIdentifier [6] IA5String,
* iPAddress [7] OCTET STRING,
* registeredID [8] OBJECT IDENTIFIER
* }
*/
const SEC_ASN1Template GeneralNameTemplate[] =
{
{SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(GeneralName)},
{SEC_ASN1_INLINE, offsetof(GeneralName, name), CERT_NameTemplate, 0},
{0, 0, nullptr, 0}
};
/**
* GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
*/
const SEC_ASN1Template GeneralNamesTemplate[] =
{
{SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(GeneralNames)},
{SEC_ASN1_INLINE | SEC_ASN1_CONTEXT_SPECIFIC | 4, offsetof(GeneralNames, names), GeneralNameTemplate, 0},
{0, 0, nullptr, 0}
};
/**
* IssuerSerial ::= SEQUENCE {
* issuer GeneralNames,
* serialNumber CertificateSerialNumber
* }
*/
const SEC_ASN1Template IssuerSerialTemplate[] =
{
{SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(IssuerSerial)},
{SEC_ASN1_INLINE, offsetof(IssuerSerial, issuer), GeneralNamesTemplate, 0},
{SEC_ASN1_INTEGER, offsetof(IssuerSerial, serialNumber), nullptr, 0},
{0, 0, nullptr, 0}
};
/**
* Hash ::= OCTET STRING
*
* ESSCertIDv2 ::= SEQUENCE {
* hashAlgorithm AlgorithmIdentifier DEFAULT {algorithm id-sha256},
* certHash Hash,
* issuerSerial IssuerSerial OPTIONAL
* }
*/
SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)
const SEC_ASN1Template ESSCertIDv2Template[] =
{
{SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(ESSCertIDv2)},
{SEC_ASN1_INLINE | SEC_ASN1_XTRN, offsetof(ESSCertIDv2, hashAlgorithm), SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate), 0},
{SEC_ASN1_OCTET_STRING, offsetof(ESSCertIDv2, certHash), nullptr, 0},
{SEC_ASN1_INLINE | SEC_ASN1_XTRN, offsetof(ESSCertIDv2, issuerSerial), IssuerSerialTemplate, 0},
{0, 0, nullptr, 0}
};
/**
* SigningCertificateV2 ::= SEQUENCE {
* }
*/
const SEC_ASN1Template SigningCertificateV2Template[] =
{
{SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(SigningCertificateV2)},
{SEC_ASN1_SEQUENCE_OF, offsetof(SigningCertificateV2, certs), ESSCertIDv2Template, 0},
{0, 0, nullptr, 0}
};
struct PKIStatusInfo {
SECItem status;
SECItem statusString;
SECItem failInfo;
};
const SEC_ASN1Template PKIStatusInfo_Template[] =
{
{ SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(PKIStatusInfo) },
{ SEC_ASN1_INTEGER, offsetof(PKIStatusInfo, status), nullptr, 0 },
{ SEC_ASN1_CONSTRUCTED | SEC_ASN1_SEQUENCE | SEC_ASN1_OPTIONAL, offsetof(PKIStatusInfo, statusString), nullptr, 0 },
{ SEC_ASN1_BIT_STRING | SEC_ASN1_OPTIONAL, offsetof(PKIStatusInfo, failInfo), nullptr, 0 },
{ 0, 0, nullptr, 0 }
};
const SEC_ASN1Template Any_Template[] =
{
{ SEC_ASN1_ANY, 0, nullptr, sizeof(SECItem) }
};
struct TimeStampResp {
PKIStatusInfo status;
SECItem timeStampToken;
};
const SEC_ASN1Template TimeStampResp_Template[] =
{
{ SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(TimeStampResp) },
{ SEC_ASN1_INLINE, offsetof(TimeStampResp, status), PKIStatusInfo_Template, 0 },
{ SEC_ASN1_ANY | SEC_ASN1_OPTIONAL, offsetof(TimeStampResp, timeStampToken), Any_Template, 0 },
{ 0, 0, nullptr, 0 }
};
const SEC_ASN1Template MessageImprint_Template[] =
{
{ SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(MessageImprint) },
{ SEC_ASN1_INLINE, offsetof(MessageImprint, hashAlgorithm), SECOID_AlgorithmIDTemplate, 0 },
{ SEC_ASN1_OCTET_STRING, offsetof(MessageImprint, hashedMessage), nullptr, 0 },
{ 0, 0, nullptr, 0 }
};
const SEC_ASN1Template Extension_Template[] =
{
{ SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(Extension) },
{ SEC_ASN1_OBJECT_ID, offsetof(Extension, extnID), nullptr, 0 },
{ SEC_ASN1_BOOLEAN, offsetof(Extension, critical), nullptr, 0 },
{ SEC_ASN1_OCTET_STRING, offsetof(Extension, extnValue), nullptr, 0 },
{ 0, 0, nullptr, 0 }
};
const SEC_ASN1Template Extensions_Template[] =
{
{ SEC_ASN1_SEQUENCE_OF, 0, Extension_Template, 0 }
};
const SEC_ASN1Template TimeStampReq_Template[] =
{
{ SEC_ASN1_SEQUENCE, 0, nullptr, sizeof(TimeStampReq) },
{ SEC_ASN1_INTEGER, offsetof(TimeStampReq, version), nullptr, 0 },
{ SEC_ASN1_INLINE, offsetof(TimeStampReq, messageImprint), MessageImprint_Template, 0 },
{ SEC_ASN1_OBJECT_ID | SEC_ASN1_OPTIONAL, offsetof(TimeStampReq, reqPolicy), nullptr, 0 },
{ SEC_ASN1_INTEGER | SEC_ASN1_OPTIONAL, offsetof(TimeStampReq, nonce), nullptr, 0 },
{ SEC_ASN1_BOOLEAN | SEC_ASN1_OPTIONAL, offsetof(TimeStampReq, certReq), nullptr, 0 },
{ SEC_ASN1_OPTIONAL | SEC_ASN1_CONTEXT_SPECIFIC | 0, offsetof(TimeStampReq, extensions), Extensions_Template, 0 },
{ 0, 0, nullptr, 0 }
};
size_t AppendToBuffer(char const *ptr, size_t size, size_t nmemb, void *userdata)
{
OStringBuffer *pBuffer = static_cast<OStringBuffer*>(userdata);
pBuffer->append(ptr, size*nmemb);
return size*nmemb;
}
OUString PKIStatusToString(int n)
{
switch (n)
{
case 0: return u"granted"_ustr;
case 1: return u"grantedWithMods"_ustr;
case 2: return u"rejection"_ustr;
case 3: return u"waiting"_ustr;
case 4: return u"revocationWarning"_ustr;
case 5: return u"revocationNotification"_ustr;
default: return "unknown (" + OUString::number(n) + ")";
}
}
OUString PKIStatusInfoToString(const PKIStatusInfo& rStatusInfo)
{
OUString result = u"{status="_ustr;
if (rStatusInfo.status.len == 1)
result += PKIStatusToString(rStatusInfo.status.data[0]);
else
result += "unknown (len=" + OUString::number(rStatusInfo.status.len);
// FIXME: Perhaps look at rStatusInfo.statusString.data but note
// that we of course can't assume it contains proper UTF-8. After
// all, it is data from an external source. Also, RFC3161 claims
// it should be a SEQUENCE (1..MAX) OF UTF8String, but another
// source claimed it would be a single UTF8String, hmm?
// FIXME: Worth it to decode failInfo to cleartext, probably not at least as long as this is only for a SAL_INFO
result += "}";
return result;
}
// SEC_StringToOID() and NSS_CMSSignerInfo_AddUnauthAttr() are
// not exported from libsmime, so copy them here. Sigh.
SECStatus
my_SEC_StringToOID(SECItem *to, const char *from, PRUint32 len)
{
PRUint32 decimal_numbers = 0;
PRUint32 result_bytes = 0;
SECStatus rv;
PRUint8 result[1024];
static const PRUint32 max_decimal = 0xffffffff / 10;
static const char OIDstring[] = {"OID."};
if (!from || !to) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!len) {
len = PL_strlen(from);
}
if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4)) {
from += 4; /* skip leading "OID." if present */
len -= 4;
}
if (!len) {
bad_data:
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
do {
PRUint32 decimal = 0;
while (len > 0 && rtl::isAsciiDigit(static_cast<unsigned char>(*from))) {
PRUint32 addend = *from++ - '0';
--len;
if (decimal > max_decimal) /* overflow */
goto bad_data;
decimal = (decimal * 10) + addend;
if (decimal < addend) /* overflow */
goto bad_data;
}
if (len != 0 && *from != '.') {
goto bad_data;
}
if (decimal_numbers == 0) {
if (decimal > 2)
goto bad_data;
result[0] = decimal * 40;
result_bytes = 1;
} else if (decimal_numbers == 1) {
if (decimal > 40)
goto bad_data;
result[0] += decimal;
} else {
/* encode the decimal number, */
PRUint8 * rp;
PRUint32 num_bytes = 0;
PRUint32 tmp = decimal;
while (tmp) {
num_bytes++;
tmp >>= 7;
}
if (!num_bytes )
++num_bytes; /* use one byte for a zero value */
if (num_bytes + result_bytes > sizeof result)
goto bad_data;
tmp = num_bytes;
rp = result + result_bytes - 1;
rp[tmp] = static_cast<PRUint8>(decimal & 0x7f);
decimal >>= 7;
while (--tmp > 0) {
rp[tmp] = static_cast<PRUint8>(decimal | 0x80);
decimal >>= 7;
}
result_bytes += num_bytes;
}
++decimal_numbers;
if (len > 0) { /* skip trailing '.' */
++from;
--len;
}
} while (len > 0);
/* now result contains result_bytes of data */
if (to->data && to->len >= result_bytes) {
to->len = result_bytes;
PORT_Memcpy(to->data, result, to->len);
rv = SECSuccess;
} else {
SECItem result_item = {siBuffer, nullptr, 0 };
result_item.data = result;
result_item.len = result_bytes;
rv = SECITEM_CopyItem(nullptr, to, &result_item);
}
return rv;
}
NSSCMSAttribute *
my_NSS_CMSAttributeArray_FindAttrByOidTag(NSSCMSAttribute **attrs, SECOidTag oidtag, PRBool only)
{
SECOidData *oid;
NSSCMSAttribute *attr1, *attr2;
if (attrs == nullptr)
return nullptr;
oid = SECOID_FindOIDByTag(oidtag);
if (oid == nullptr)
return nullptr;
while ((attr1 = *attrs++) != nullptr) {
if (attr1->type.len == oid->oid.len && PORT_Memcmp (attr1->type.data,
oid->oid.data,
oid->oid.len) == 0)
break;
}
if (attr1 == nullptr)
return nullptr;
if (!only)
return attr1;
while ((attr2 = *attrs++) != nullptr) {
if (attr2->type.len == oid->oid.len && PORT_Memcmp (attr2->type.data,
oid->oid.data,
oid->oid.len) == 0)
break;
}
if (attr2 != nullptr)
return nullptr;
return attr1;
}
SECStatus
my_NSS_CMSArray_Add(PLArenaPool *poolp, void ***array, void *obj)
{
int n = 0;
void **dest;
PORT_Assert(array != NULL);
if (array == nullptr)
return SECFailure;
if (*array == nullptr) {
dest = static_cast<void **>(PORT_ArenaAlloc(poolp, 2 * sizeof(void *)));
} else {
void **p = *array;
while (*p++)
n++;
dest = static_cast<void **>(PORT_ArenaGrow (poolp,
*array,
(n + 1) * sizeof(void *),
(n + 2) * sizeof(void *)));
}
if (dest == nullptr)
return SECFailure;
dest[n] = obj;
dest[n+1] = nullptr;
*array = dest;
return SECSuccess;
}
SECOidTag
my_NSS_CMSAttribute_GetType(const NSSCMSAttribute *attr)
{
SECOidData *typetag;
typetag = SECOID_FindOID(&(attr->type));
if (typetag == nullptr)
return SEC_OID_UNKNOWN;
return typetag->offset;
}
SECStatus
my_NSS_CMSAttributeArray_AddAttr(PLArenaPool *poolp, NSSCMSAttribute ***attrs, NSSCMSAttribute *attr)
{
NSSCMSAttribute *oattr;
void *mark;
SECOidTag type;
mark = PORT_ArenaMark(poolp);
/* find oidtag of attr */
type = my_NSS_CMSAttribute_GetType(attr);
/* see if we have one already */
oattr = my_NSS_CMSAttributeArray_FindAttrByOidTag(*attrs, type, PR_FALSE);
PORT_Assert (oattr == NULL);
if (oattr != nullptr)
goto loser; /* XXX or would it be better to replace it? */
/* no, shove it in */
if (my_NSS_CMSArray_Add(poolp, reinterpret_cast<void ***>(attrs), static_cast<void *>(attr)) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return SECSuccess;
loser:
PORT_ArenaRelease(poolp, mark);
return SECFailure;
}
SECStatus
my_NSS_CMSSignerInfo_AddUnauthAttr(NSSCMSSignerInfo *signerinfo, NSSCMSAttribute *attr)
{
return my_NSS_CMSAttributeArray_AddAttr(signerinfo->cmsg->poolp, &(signerinfo->unAuthAttr), attr);
}
SECStatus
my_NSS_CMSSignerInfo_AddAuthAttr(NSSCMSSignerInfo *signerinfo, NSSCMSAttribute *attr)
{
return my_NSS_CMSAttributeArray_AddAttr(signerinfo->cmsg->poolp, &(signerinfo->authAttr), attr);
}
NSSCMSMessage *CreateCMSMessage(const PRTime* time,
NSSCMSSignedData **cms_sd,
NSSCMSSignerInfo **cms_signer,
CERTCertificate *cert,
SECItem *digest)
{
NSSCMSMessage *result = NSS_CMSMessage_Create(nullptr);
if (!result)
{
SAL_WARN("svl.crypto", "NSS_CMSMessage_Create failed");
return nullptr;
}
*cms_sd = NSS_CMSSignedData_Create(result);
if (!*cms_sd)
{
SAL_WARN("svl.crypto", "NSS_CMSSignedData_Create failed");
NSS_CMSMessage_Destroy(result);
return nullptr;
}
NSSCMSContentInfo *cms_cinfo = NSS_CMSMessage_GetContentInfo(result);
if (NSS_CMSContentInfo_SetContent_SignedData(result, cms_cinfo, *cms_sd) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSContentInfo_SetContent_SignedData failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
cms_cinfo = NSS_CMSSignedData_GetContentInfo(*cms_sd);
// Attach NULL data as detached data
if (NSS_CMSContentInfo_SetContent_Data(result, cms_cinfo, nullptr, PR_TRUE) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSContentInfo_SetContent_Data failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
// workaround: with legacy "dbm:", NSS can't find the private key - try out
// if it works, and fallback if it doesn't.
if (SECKEYPrivateKey * pPrivateKey = PK11_FindKeyByAnyCert(cert, nullptr))
{
if (!comphelper::LibreOfficeKit::isActive())
{
// pPrivateKey only exists in the memory in the LOK case, don't delete it.
SECKEY_DestroyPrivateKey(pPrivateKey);
}
*cms_signer = NSS_CMSSignerInfo_Create(result, cert, SEC_OID_SHA256);
}
else
{
pPrivateKey = PK11_FindKeyByDERCert(cert->slot, cert, nullptr);
SECKEYPublicKey *const pPublicKey = CERT_ExtractPublicKey(cert);
if (pPublicKey && pPrivateKey)
{
*cms_signer = NSS_CMSSignerInfo_CreateWithSubjKeyID(result, &cert->subjectKeyID, pPublicKey, pPrivateKey, SEC_OID_SHA256);
SECKEY_DestroyPrivateKey(pPrivateKey);
SECKEY_DestroyPublicKey(pPublicKey);
if (*cms_signer)
{
// this is required in NSS_CMSSignerInfo_IncludeCerts()
// (and NSS_CMSSignerInfo_GetSigningCertificate() doesn't work)
(**cms_signer).cert = CERT_DupCertificate(cert);
}
}
}
if (!*cms_signer)
{
SAL_WARN("svl.crypto", "NSS_CMSSignerInfo_Create failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
if (time && NSS_CMSSignerInfo_AddSigningTime(*cms_signer, *time) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignerInfo_AddSigningTime failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
if (NSS_CMSSignerInfo_IncludeCerts(*cms_signer, NSSCMSCM_CertChain, certUsageEmailSigner) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignerInfo_IncludeCerts failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
if (NSS_CMSSignedData_AddCertificate(*cms_sd, cert) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignedData_AddCertificate failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
if (NSS_CMSSignedData_AddSignerInfo(*cms_sd, *cms_signer) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignedData_AddSignerInfo failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
if (NSS_CMSSignedData_SetDigestValue(*cms_sd, SEC_OID_SHA256, digest) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignedData_SetDigestValue failed");
NSS_CMSSignedData_Destroy(*cms_sd);
NSS_CMSMessage_Destroy(result);
return nullptr;
}
return result;
}
#elif USE_CRYPTO_MSCAPI // ends USE_CRYPTO_NSS
/// Counts how many bytes are needed to encode a given length.
size_t GetDERLengthOfLength(size_t nLength)
{
size_t nRet = 1;
if(nLength > 127)
{
while (nLength >> (nRet * 8))
++nRet;
// Long form means one additional byte: the length of the length and
// the length itself.
++nRet;
}
return nRet;
}
/// Writes the length part of the header.
void WriteDERLength(SvStream& rStream, size_t nLength)
{
size_t nLengthOfLength = GetDERLengthOfLength(nLength);
if (nLengthOfLength == 1)
{
// We can use the short form.
rStream.WriteUInt8(nLength);
return;
}
// 0x80 means that the we use the long form: the first byte is the length
// of length with the highest bit set to 1, not the actual length.
rStream.WriteUInt8(0x80 | (nLengthOfLength - 1));
for (size_t i = 1; i < nLengthOfLength; ++i)
rStream.WriteUInt8(nLength >> ((nLengthOfLength - i - 1) * 8));
}
const unsigned nASN1_INTEGER = 0x02;
const unsigned nASN1_OCTET_STRING = 0x04;
const unsigned nASN1_NULL = 0x05;
const unsigned nASN1_OBJECT_IDENTIFIER = 0x06;
const unsigned nASN1_SEQUENCE = 0x10;
/// An explicit tag on a constructed value.
const unsigned nASN1_TAGGED_CONSTRUCTED = 0xa0;
const unsigned nASN1_CONSTRUCTED = 0x20;
/// Create payload for the 'signing-certificate' signed attribute.
bool CreateSigningCertificateAttribute(void const * pDerEncoded, int nDerEncoded, PCCERT_CONTEXT pCertContext, SvStream& rEncodedCertificate)
{
// CryptEncodeObjectEx() does not support encoding arbitrary ASN.1
// structures, like SigningCertificateV2 from RFC 5035, so let's build it
// manually.
// Count the certificate hash and put it to aHash.
// 2.16.840.1.101.3.4.2.1, i.e. sha256.
std::vector<unsigned char> aSHA256{0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01};
HCRYPTPROV hProv = 0;
if (!CryptAcquireContextW(&hProv, nullptr, nullptr, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
{
SAL_WARN("svl.crypto", "CryptAcquireContext() failed");
return false;
}
HCRYPTHASH hHash = 0;
if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, &hHash))
{
SAL_WARN("svl.crypto", "CryptCreateHash() failed");
return false;
}
if (!CryptHashData(hHash, static_cast<const BYTE*>(pDerEncoded), nDerEncoded, 0))
{
SAL_WARN("svl.crypto", "CryptHashData() failed");
return false;
}
DWORD nHash = 0;
if (!CryptGetHashParam(hHash, HP_HASHVAL, nullptr, &nHash, 0))
{
SAL_WARN("svl.crypto", "CryptGetHashParam() failed to provide the hash length");
return false;
}
std::vector<unsigned char> aHash(nHash);
if (!CryptGetHashParam(hHash, HP_HASHVAL, aHash.data(), &nHash, 0))
{
SAL_WARN("svl.crypto", "CryptGetHashParam() failed to provide the hash");
return false;
}
CryptDestroyHash(hHash);
CryptReleaseContext(hProv, 0);
// Collect info for IssuerSerial.
BYTE* pIssuer = pCertContext->pCertInfo->Issuer.pbData;
DWORD nIssuer = pCertContext->pCertInfo->Issuer.cbData;
BYTE* pSerial = pCertContext->pCertInfo->SerialNumber.pbData;
DWORD nSerial = pCertContext->pCertInfo->SerialNumber.cbData;
// pSerial is LE, aSerial is BE.
std::vector<BYTE> aSerial(nSerial);
for (size_t i = 0; i < nSerial; ++i)
aSerial[i] = *(pSerial + nSerial - i - 1);
// We now have all the info to count the lengths.
// The layout of the payload is:
// SEQUENCE: SigningCertificateV2
// SEQUENCE: SEQUENCE OF ESSCertIDv2
// SEQUENCE: ESSCertIDv2
// SEQUENCE: AlgorithmIdentifier
// OBJECT: algorithm
// NULL: parameters
// OCTET STRING: certHash
// SEQUENCE: IssuerSerial
// SEQUENCE: GeneralNames
// cont [ 4 ]: Name
// SEQUENCE: Issuer blob
// INTEGER: CertificateSerialNumber
size_t nAlgorithm = 1 + GetDERLengthOfLength(aSHA256.size()) + aSHA256.size();
size_t nParameters = 1 + GetDERLengthOfLength(1);
size_t nAlgorithmIdentifier = 1 + GetDERLengthOfLength(nAlgorithm + nParameters) + nAlgorithm + nParameters;
size_t nCertHash = 1 + GetDERLengthOfLength(aHash.size()) + aHash.size();
size_t nName = 1 + GetDERLengthOfLength(nIssuer) + nIssuer;
size_t nGeneralNames = 1 + GetDERLengthOfLength(nName) + nName;
size_t nCertificateSerialNumber = 1 + GetDERLengthOfLength(nSerial) + nSerial;
size_t nIssuerSerial = 1 + GetDERLengthOfLength(nGeneralNames + nCertificateSerialNumber) + nGeneralNames + nCertificateSerialNumber;
size_t nESSCertIDv2 = 1 + GetDERLengthOfLength(nAlgorithmIdentifier + nCertHash + nIssuerSerial) + nAlgorithmIdentifier + nCertHash + nIssuerSerial;
size_t nESSCertIDv2s = 1 + GetDERLengthOfLength(nESSCertIDv2) + nESSCertIDv2;
// Write SigningCertificateV2.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nESSCertIDv2s);
// Write SEQUENCE OF ESSCertIDv2.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nESSCertIDv2);
// Write ESSCertIDv2.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nAlgorithmIdentifier + nCertHash + nIssuerSerial);
// Write AlgorithmIdentifier.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nAlgorithm + nParameters);
// Write algorithm.
rEncodedCertificate.WriteUInt8(nASN1_OBJECT_IDENTIFIER);
WriteDERLength(rEncodedCertificate, aSHA256.size());
rEncodedCertificate.WriteBytes(aSHA256.data(), aSHA256.size());
// Write parameters.
rEncodedCertificate.WriteUInt8(nASN1_NULL);
rEncodedCertificate.WriteUInt8(0);
// Write certHash.
rEncodedCertificate.WriteUInt8(nASN1_OCTET_STRING);
WriteDERLength(rEncodedCertificate, aHash.size());
rEncodedCertificate.WriteBytes(aHash.data(), aHash.size());
// Write IssuerSerial.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nGeneralNames + nCertificateSerialNumber);
// Write GeneralNames.
rEncodedCertificate.WriteUInt8(nASN1_SEQUENCE | nASN1_CONSTRUCTED);
WriteDERLength(rEncodedCertificate, nName);
// Write Name.
rEncodedCertificate.WriteUInt8(nASN1_TAGGED_CONSTRUCTED | 4);
WriteDERLength(rEncodedCertificate, nIssuer);
rEncodedCertificate.WriteBytes(pIssuer, nIssuer);
// Write CertificateSerialNumber.
rEncodedCertificate.WriteUInt8(nASN1_INTEGER);
WriteDERLength(rEncodedCertificate, nSerial);
rEncodedCertificate.WriteBytes(aSerial.data(), aSerial.size());
return true;
}
#endif // USE_CRYPTO_MSCAPI
} // anonymous namespace
namespace svl::crypto {
static int AsHex(char ch)
{
int nRet = 0;
if (rtl::isAsciiDigit(static_cast<unsigned char>(ch)))
nRet = ch - '0';
else
{
if (ch >= 'a' && ch <= 'f')
nRet = ch - 'a';
else if (ch >= 'A' && ch <= 'F')
nRet = ch - 'A';
else
return -1;
nRet += 10;
}
return nRet;
}
std::vector<unsigned char> DecodeHexString(std::string_view rHex)
{
std::vector<unsigned char> aRet;
size_t nHexLen = rHex.size();
{
int nByte = 0;
int nCount = 2;
for (size_t i = 0; i < nHexLen; ++i)
{
nByte = nByte << 4;
sal_Int8 nParsed = AsHex(rHex[i]);
if (nParsed == -1)
{
SAL_WARN("svl.crypto", "DecodeHexString: invalid hex value");
return aRet;
}
nByte += nParsed;
--nCount;
if (!nCount)
{
aRet.push_back(nByte);
nCount = 2;
nByte = 0;
}
}
}
return aRet;
}
bool Signing::Sign(OStringBuffer& rCMSHexBuffer)
{
#if !USE_CRYPTO_ANY
(void)rCMSHexBuffer;
return false;
#else
// Create the PKCS#7 object.
css::uno::Sequence<sal_Int8> aDerEncoded;
if (m_rSigningContext.m_xCertificate.is())
{
aDerEncoded = m_rSigningContext.m_xCertificate->getEncoded();
if (!aDerEncoded.hasElements())
{
SAL_WARN("svl.crypto", "Crypto::Signing: empty certificate");
return false;
}
}
#if USE_CRYPTO_NSS
std::vector<unsigned char> aHashResult;
{
comphelper::Hash aHash(comphelper::HashType::SHA256);
for (const auto& pair : m_dataBlocks)
aHash.update(static_cast<const unsigned char*>(pair.first), pair.second);
aHashResult = aHash.finalize();
}
SECItem digest;
digest.data = aHashResult.data();
digest.len = aHashResult.size();
PRTime now = PR_Now();
// The context unit is milliseconds, PR_Now() unit is microseconds.
if (m_rSigningContext.m_nSignatureTime)
{
now = m_rSigningContext.m_nSignatureTime * 1000;
}
else
{
m_rSigningContext.m_nSignatureTime = now / 1000;
}
if (!m_rSigningContext.m_xCertificate.is())
{
m_rSigningContext.m_aDigest = std::move(aHashResult);
// No certificate is provided: don't actually sign -- just update the context with the
// parameters for the signing and return.
return false;
}
CERTCertificate *cert = CERT_DecodeCertFromPackage(reinterpret_cast<char *>(aDerEncoded.getArray()), aDerEncoded.getLength());
if (!cert)
{
SAL_WARN("svl.crypto", "CERT_DecodeCertFromPackage failed");
return false;
}
NSSCMSSignedData *cms_sd(nullptr);
NSSCMSSignerInfo *cms_signer(nullptr);
NSSCMSMessage *cms_msg = CreateCMSMessage(nullptr, &cms_sd, &cms_signer, cert, &digest);
if (!cms_msg)
return false;
OString pass(OUStringToOString( m_aSignPassword, RTL_TEXTENCODING_UTF8 ));
// Add the signing certificate as a signed attribute.
ESSCertIDv2* aCertIDs[2];
ESSCertIDv2 aCertID;
// Write ESSCertIDv2.hashAlgorithm.
aCertID.hashAlgorithm.algorithm.data = nullptr;
aCertID.hashAlgorithm.parameters.data = nullptr;
SECOID_SetAlgorithmID(nullptr, &aCertID.hashAlgorithm, SEC_OID_SHA256, nullptr);
comphelper::ScopeGuard aAlgoGuard(
[&aCertID] () { SECOID_DestroyAlgorithmID(&aCertID.hashAlgorithm, false); } );
// Write ESSCertIDv2.certHash.
SECItem aCertHashItem;
auto pDerEncoded = reinterpret_cast<const unsigned char *>(aDerEncoded.getArray());
std::vector<unsigned char> aCertHashResult = comphelper::Hash::calculateHash(pDerEncoded, aDerEncoded.getLength(), comphelper::HashType::SHA256);
aCertHashItem.type = siBuffer;
aCertHashItem.data = aCertHashResult.data();
aCertHashItem.len = aCertHashResult.size();
aCertID.certHash = aCertHashItem;
// Write ESSCertIDv2.issuerSerial.
IssuerSerial aSerial;
GeneralName aName;
aName.name = cert->issuer;
aSerial.issuer.names = aName;
aSerial.serialNumber = cert->serialNumber;
aCertID.issuerSerial = aSerial;
// Write SigningCertificateV2.certs.
aCertIDs[0] = &aCertID;
aCertIDs[1] = nullptr;
SigningCertificateV2 aCertificate;
aCertificate.certs = &aCertIDs[0];
SECItem* pEncodedCertificate = SEC_ASN1EncodeItem(nullptr, nullptr, &aCertificate, SigningCertificateV2Template);
if (!pEncodedCertificate)
{
SAL_WARN("svl.crypto", "SEC_ASN1EncodeItem() failed");
return false;
}
NSSCMSAttribute aAttribute;
SECItem aAttributeValues[2];
SECItem* pAttributeValues[2];
pAttributeValues[0] = aAttributeValues;
pAttributeValues[1] = nullptr;
aAttributeValues[0] = *pEncodedCertificate;
aAttributeValues[1].type = siBuffer;
aAttributeValues[1].data = nullptr;
aAttributeValues[1].len = 0;
aAttribute.values = pAttributeValues;
SECOidData aOidData;
aOidData.oid.data = nullptr;
/*
* id-aa-signingCertificateV2 OBJECT IDENTIFIER ::=
* { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
* smime(16) id-aa(2) 47 }
*/
if (my_SEC_StringToOID(&aOidData.oid, "1.2.840.113549.1.9.16.2.47", 0) != SECSuccess)
{
SAL_WARN("svl.crypto", "my_SEC_StringToOID() failed");
return false;
}
comphelper::ScopeGuard aGuard(
[&aOidData] () { SECITEM_FreeItem(&aOidData.oid, false); } );
aOidData.offset = SEC_OID_UNKNOWN;
aOidData.desc = "id-aa-signingCertificateV2";
aOidData.mechanism = CKM_SHA_1;
aOidData.supportedExtension = UNSUPPORTED_CERT_EXTENSION;
aAttribute.typeTag = &aOidData;
aAttribute.type = aOidData.oid;
aAttribute.encoded = PR_TRUE;
if (my_NSS_CMSSignerInfo_AddAuthAttr(cms_signer, &aAttribute) != SECSuccess)
{
SAL_WARN("svl.crypto", "my_NSS_CMSSignerInfo_AddAuthAttr() failed");
return false;
}
TimeStampReq src;
OStringBuffer response_buffer;
TimeStampResp response;
SECItem response_item;
NSSCMSAttribute timestamp;
SECItem values[2];
SECItem *valuesp[2];
valuesp[0] = values;
valuesp[1] = nullptr;
SECOidData typetag;
//NOTE: All signed/authenticated attributes are to be added before the following hash computation
if( !m_aSignTSA.isEmpty() )
{
// Create another CMS message with the same contents as cms_msg, because it doesn't seem
// possible to encode a message twice (once to get something to timestamp, and then after
// adding the timestamp attribute).
NSSCMSSignedData *ts_cms_sd;
NSSCMSSignerInfo *ts_cms_signer;
NSSCMSMessage *ts_cms_msg = CreateCMSMessage(&now, &ts_cms_sd, &ts_cms_signer, cert, &digest);
if (!ts_cms_msg)
{
return false;
}
PORT_Memcpy(ts_cms_signer, cms_signer, sizeof(NSSCMSSignerInfo));
SECItem ts_cms_output;
ts_cms_output.data = nullptr;
ts_cms_output.len = 0;
PLArenaPool *ts_arena = PORT_NewArena(10000);
NSSCMSEncoderContext *ts_cms_ecx;
ts_cms_ecx = NSS_CMSEncoder_Start(ts_cms_msg, nullptr, nullptr, &ts_cms_output, ts_arena, PDFSigningPKCS7PasswordCallback,
const_cast<char*>(pass.getStr()), nullptr, nullptr, nullptr, nullptr);
if (NSS_CMSEncoder_Finish(ts_cms_ecx) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSEncoder_Finish failed");
return false;
}
// I have compared the ts_cms_output produced here with the cms_output produced below when
// not actually calling my_NSS_CMSSignerInfo_AddUnauthAttr()), and they are identical.
std::vector<unsigned char> aTsHashResult = comphelper::Hash::calculateHash(ts_cms_signer->encDigest.data, ts_cms_signer->encDigest.len, comphelper::HashType::SHA256);
SECItem ts_digest;
ts_digest.type = siBuffer;
ts_digest.data = aTsHashResult.data();
ts_digest.len = aTsHashResult.size();
unsigned char cOne = 1;
unsigned char cTRUE = 0xff; // under DER rules true is 0xff, false is 0x00
src.version.type = siUnsignedInteger;
src.version.data = &cOne;
src.version.len = sizeof(cOne);
src.messageImprint.hashAlgorithm.algorithm.data = nullptr;
src.messageImprint.hashAlgorithm.parameters.data = nullptr;
SECOID_SetAlgorithmID(nullptr, &src.messageImprint.hashAlgorithm, SEC_OID_SHA256, nullptr);
src.messageImprint.hashedMessage = ts_digest;
src.reqPolicy.type = siBuffer;
src.reqPolicy.data = nullptr;
src.reqPolicy.len = 0;
unsigned int nNonce = comphelper::rng::uniform_uint_distribution(0, SAL_MAX_UINT32);
src.nonce.type = siUnsignedInteger;
src.nonce.data = reinterpret_cast<unsigned char*>(&nNonce);
src.nonce.len = sizeof(nNonce);
src.certReq.type = siUnsignedInteger;
src.certReq.data = &cTRUE;
src.certReq.len = sizeof(cTRUE);
src.extensions = nullptr;
SECItem* timestamp_request = SEC_ASN1EncodeItem(nullptr, nullptr, &src, TimeStampReq_Template);
if (timestamp_request == nullptr)
{
SAL_WARN("svl.crypto", "SEC_ASN1EncodeItem failed");
return false;
}
if (timestamp_request->data == nullptr)
{
SAL_WARN("svl.crypto", "SEC_ASN1EncodeItem succeeded but got NULL data");
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
SAL_INFO("svl.crypto", "request length=" << timestamp_request->len);
// Send time stamp request to TSA server, receive response
CURL* curl = curl_easy_init();
CURLcode rc;
struct curl_slist* slist = nullptr;
if (!curl)
{
SAL_WARN("svl.crypto", "curl_easy_init failed");
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
::InitCurl_easy(curl);
SAL_INFO("svl.crypto", "Setting curl to verbose: " << (curl_easy_setopt(curl, CURLOPT_VERBOSE, 1) == CURLE_OK ? "OK" : "FAIL"));
if ((rc = curl_easy_setopt(curl, CURLOPT_URL, OUStringToOString(m_aSignTSA, RTL_TEXTENCODING_UTF8).getStr())) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_URL) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
slist = curl_slist_append(slist, "Content-Type: application/timestamp-query");
slist = curl_slist_append(slist, "Accept: application/timestamp-reply");
if ((rc = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_HTTPHEADER) failed: " << curl_easy_strerror(rc));
curl_slist_free_all(slist);
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
if ((rc = curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<tools::Long>(timestamp_request->len))) != CURLE_OK ||
(rc = curl_easy_setopt(curl, CURLOPT_POSTFIELDS, timestamp_request->data)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_POSTFIELDSIZE or CURLOPT_POSTFIELDS) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
if ((rc = curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_buffer)) != CURLE_OK ||
(rc = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, AppendToBuffer)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_WRITEDATA or CURLOPT_WRITEFUNCTION) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
if ((rc = curl_easy_setopt(curl, CURLOPT_POST, 1)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_POST) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
char error_buffer[CURL_ERROR_SIZE];
if ((rc = curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error_buffer)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_ERRORBUFFER) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
// Use a ten second timeout
if ((rc = curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10)) != CURLE_OK ||
(rc = curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10)) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_setopt(CURLOPT_TIMEOUT or CURLOPT_CONNECTTIMEOUT) failed: " << curl_easy_strerror(rc));
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
if (curl_easy_perform(curl) != CURLE_OK)
{
SAL_WARN("svl.crypto", "curl_easy_perform failed: " << error_buffer);
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
return false;
}
SAL_INFO("svl.crypto", "PDF signing: got response, length=" << response_buffer.getLength());
curl_slist_free_all(slist);
curl_easy_cleanup(curl);
SECITEM_FreeItem(timestamp_request, PR_TRUE);
memset(&response, 0, sizeof(response));
response_item.type = siBuffer;
response_item.data = reinterpret_cast<unsigned char*>(const_cast<char*>(response_buffer.getStr()));
response_item.len = response_buffer.getLength();
if (SEC_ASN1DecodeItem(nullptr, &response, TimeStampResp_Template, &response_item) != SECSuccess)
{
SAL_WARN("svl.crypto", "SEC_ASN1DecodeItem failed");
return false;
}
SAL_INFO("svl.crypto", "TimeStampResp received and decoded, status=" << PKIStatusInfoToString(response.status));
if (response.status.status.len != 1 ||
(response.status.status.data[0] != 0 && response.status.status.data[0] != 1))
{
SAL_WARN("svl.crypto", "Timestamp request was not granted");
return false;
}
// timestamp.type filled in below
// Not sure if we actually need two entries in the values array, now when valuesp is an
// array too, the pointer to the values array followed by a null pointer. But I don't feel
// like experimenting.
values[0] = response.timeStampToken;
values[1].type = siBuffer;
values[1].data = nullptr;
values[1].len = 0;
timestamp.values = valuesp;
typetag.oid.data = nullptr;
// id-aa-timeStampToken OBJECT IDENTIFIER ::= { iso(1)
// member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9)
// smime(16) aa(2) 14 }
if (my_SEC_StringToOID(&typetag.oid, "1.2.840.113549.1.9.16.2.14", 0) != SECSuccess)
{
SAL_WARN("svl.crypto", "SEC_StringToOID failed");
return false;
}
typetag.offset = SEC_OID_UNKNOWN; // ???
typetag.desc = "id-aa-timeStampToken";
typetag.mechanism = CKM_SHA_1; // ???
typetag.supportedExtension = UNSUPPORTED_CERT_EXTENSION; // ???
timestamp.typeTag = &typetag;
timestamp.type = typetag.oid; // ???
timestamp.encoded = PR_TRUE; // ???
if (my_NSS_CMSSignerInfo_AddUnauthAttr(cms_signer, &timestamp) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSSignerInfo_AddUnauthAttr failed");
return false;
}
}
SECItem cms_output;
cms_output.data = nullptr;
cms_output.len = 0;
PLArenaPool *arena = PORT_NewArena(10000);
const ::comphelper::ScopeGuard aScopeGuard(
[&arena]() mutable { PORT_FreeArena(arena, true); } );
NSSCMSEncoderContext *cms_ecx;
// Possibly it would work to even just pass NULL for the password callback function and its
// argument here. After all, at least with the hardware token and associated software I tested
// with, the software itself pops up a dialog asking for the PIN (password). But I am not going
// to test it and risk locking up my token...
cms_ecx = NSS_CMSEncoder_Start(cms_msg, nullptr, nullptr, &cms_output, arena, PDFSigningPKCS7PasswordCallback,
const_cast<char*>(pass.getStr()), nullptr, nullptr, nullptr, nullptr);
if (!cms_ecx)
{
SAL_WARN("svl.crypto", "NSS_CMSEncoder_Start failed");
return false;
}
if (NSS_CMSEncoder_Finish(cms_ecx) != SECSuccess)
{
SAL_WARN("svl.crypto", "NSS_CMSEncoder_Finish failed");
return false;
}
if (cms_output.len*2 > MAX_SIGNATURE_CONTENT_LENGTH)
{
SAL_WARN("svl.crypto", "Signature requires more space (" << cms_output.len*2 << ") than we reserved (" << MAX_SIGNATURE_CONTENT_LENGTH << ")");
NSS_CMSMessage_Destroy(cms_msg);
return false;
}
for (unsigned int i = 0; i < cms_output.len ; i++)
appendHex(cms_output.data[i], rCMSHexBuffer);
SECITEM_FreeItem(pEncodedCertificate, PR_TRUE);
NSS_CMSMessage_Destroy(cms_msg);
return true;
#elif USE_CRYPTO_MSCAPI // ends USE_CRYPTO_NSS
PCCERT_CONTEXT pCertContext = CertCreateCertificateContext(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, reinterpret_cast<const BYTE*>(aDerEncoded.getArray()), aDerEncoded.getLength());
if (pCertContext == nullptr)
{
SAL_WARN("svl.crypto", "CertCreateCertificateContext failed: " << WindowsErrorString(GetLastError()));
return false;
}
CRYPT_SIGN_MESSAGE_PARA aPara = {};
aPara.cbSize = sizeof(aPara);
aPara.dwMsgEncodingType = PKCS_7_ASN_ENCODING | X509_ASN_ENCODING;
aPara.pSigningCert = pCertContext;
aPara.HashAlgorithm.pszObjId = const_cast<LPSTR>(szOID_NIST_sha256);
aPara.HashAlgorithm.Parameters.cbData = 0;
aPara.cMsgCert = 1;
aPara.rgpMsgCert = &pCertContext;
NCRYPT_KEY_HANDLE hCryptKey = 0;
DWORD dwFlags = CRYPT_ACQUIRE_CACHE_FLAG | CRYPT_ACQUIRE_ONLY_NCRYPT_KEY_FLAG;
HCRYPTPROV_OR_NCRYPT_KEY_HANDLE* phCryptProvOrNCryptKey = &hCryptKey;
DWORD nKeySpec;
BOOL bFreeNeeded;
if (!CryptAcquireCertificatePrivateKey(pCertContext,
dwFlags,
nullptr,
phCryptProvOrNCryptKey,
&nKeySpec,
&bFreeNeeded))
{
SAL_WARN("svl.crypto", "CryptAcquireCertificatePrivateKey failed: " << WindowsErrorString(GetLastError()));
CertFreeCertificateContext(pCertContext);
return false;
}
assert(!bFreeNeeded);
CMSG_SIGNER_ENCODE_INFO aSignerInfo = {};
aSignerInfo.cbSize = sizeof(aSignerInfo);
aSignerInfo.pCertInfo = pCertContext->pCertInfo;
aSignerInfo.hNCryptKey = hCryptKey;
aSignerInfo.dwKeySpec = nKeySpec;
aSignerInfo.HashAlgorithm.pszObjId = const_cast<LPSTR>(szOID_NIST_sha256);
aSignerInfo.HashAlgorithm.Parameters.cbData = 0;
// Add the signing certificate as a signed attribute.
CRYPT_INTEGER_BLOB aCertificateBlob;
SvMemoryStream aEncodedCertificate;
if (!CreateSigningCertificateAttribute(aDerEncoded.getArray(), aDerEncoded.getLength(), pCertContext, aEncodedCertificate))
{
SAL_WARN("svl.crypto", "CreateSigningCertificateAttribute() failed");
return false;
}
aCertificateBlob.pbData = const_cast<BYTE*>(static_cast<const BYTE*>(aEncodedCertificate.GetData()));
aCertificateBlob.cbData = aEncodedCertificate.GetSize();
CRYPT_ATTRIBUTE aCertificateAttribute;
/*
* id-aa-signingCertificateV2 OBJECT IDENTIFIER ::=
* { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
* smime(16) id-aa(2) 47 }
*/
aCertificateAttribute.pszObjId = const_cast<LPSTR>("1.2.840.113549.1.9.16.2.47");
aCertificateAttribute.cValue = 1;
aCertificateAttribute.rgValue = &aCertificateBlob;
aSignerInfo.cAuthAttr = 1;
aSignerInfo.rgAuthAttr = &aCertificateAttribute;
CMSG_SIGNED_ENCODE_INFO aSignedInfo = {};
aSignedInfo.cbSize = sizeof(aSignedInfo);
aSignedInfo.cSigners = 1;
aSignedInfo.rgSigners = &aSignerInfo;
CERT_BLOB aCertBlob;
aCertBlob.cbData = pCertContext->cbCertEncoded;
aCertBlob.pbData = pCertContext->pbCertEncoded;
aSignedInfo.cCertEncoded = 1;
aSignedInfo.rgCertEncoded = &aCertBlob;
HCRYPTMSG hMsg = CryptMsgOpenToEncode(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
CMSG_DETACHED_FLAG,
CMSG_SIGNED,
&aSignedInfo,
nullptr,
nullptr);
if (!hMsg)
{
SAL_WARN("svl.crypto", "CryptMsgOpenToEncode failed: " << WindowsErrorString(GetLastError()));
CertFreeCertificateContext(pCertContext);
return false;
}
for (size_t i = 0; i < m_dataBlocks.size(); ++i)
{
const bool last = (i == m_dataBlocks.size() - 1);
if (!CryptMsgUpdate(hMsg, static_cast<const BYTE *>(m_dataBlocks[i].first), m_dataBlocks[i].second, last))
{
SAL_WARN("svl.crypto", "CryptMsgUpdate failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
}
PCRYPT_TIMESTAMP_CONTEXT pTsContext = nullptr;
if( !m_aSignTSA.isEmpty() )
{
HCRYPTMSG hDecodedMsg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
CMSG_DETACHED_FLAG,
CMSG_SIGNED,
0,
nullptr,
nullptr);
if (!hDecodedMsg)
{
SAL_WARN("svl.crypto", "CryptMsgOpenToDecode failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
DWORD nTsSigLen = 0;
if (!CryptMsgGetParam(hMsg, CMSG_BARE_CONTENT_PARAM, 0, nullptr, &nTsSigLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_BARE_CONTENT_PARAM) failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
SAL_INFO("svl.crypto", "nTsSigLen=" << nTsSigLen);
std::unique_ptr<BYTE[]> pTsSig(new BYTE[nTsSigLen]);
if (!CryptMsgGetParam(hMsg, CMSG_BARE_CONTENT_PARAM, 0, pTsSig.get(), &nTsSigLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_BARE_CONTENT_PARAM) failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
if (!CryptMsgUpdate(hDecodedMsg, pTsSig.get(), nTsSigLen, TRUE))
{
SAL_WARN("svl.crypto", "CryptMsgUpdate failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
DWORD nDecodedSignerInfoLen = 0;
if (!CryptMsgGetParam(hDecodedMsg, CMSG_SIGNER_INFO_PARAM, 0, nullptr, &nDecodedSignerInfoLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_SIGNER_INFO_PARAM) failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
std::unique_ptr<BYTE[]> pDecodedSignerInfoBuf(new BYTE[nDecodedSignerInfoLen]);
if (!CryptMsgGetParam(hDecodedMsg, CMSG_SIGNER_INFO_PARAM, 0, pDecodedSignerInfoBuf.get(), &nDecodedSignerInfoLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_SIGNER_INFO_PARAM) failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
CMSG_SIGNER_INFO *pDecodedSignerInfo = reinterpret_cast<CMSG_SIGNER_INFO *>(pDecodedSignerInfoBuf.get());
CRYPT_TIMESTAMP_PARA aTsPara;
unsigned int nNonce = comphelper::rng::uniform_uint_distribution(0, SAL_MAX_UINT32);
aTsPara.pszTSAPolicyId = nullptr;
aTsPara.fRequestCerts = TRUE;
aTsPara.Nonce.cbData = sizeof(nNonce);
aTsPara.Nonce.pbData = reinterpret_cast<BYTE *>(&nNonce);
aTsPara.cExtension = 0;
aTsPara.rgExtension = nullptr;
if (!CryptRetrieveTimeStamp(o3tl::toW(m_aSignTSA.getStr()),
0,
10000,
szOID_NIST_sha256,
&aTsPara,
pDecodedSignerInfo->EncryptedHash.pbData,
pDecodedSignerInfo->EncryptedHash.cbData,
&pTsContext,
nullptr,
nullptr))
{
SAL_WARN("svl.crypto", "CryptRetrieveTimeStamp failed: " << WindowsErrorString(GetLastError()));
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
SAL_INFO("svl.crypto", "Time stamp size is " << pTsContext->cbEncoded << " bytes");
// I tried to use CryptMsgControl() with CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR to add the
// timestamp, but that failed with "The parameter is incorrect". Probably it is too late to
// modify the message once its data has already been encoded as part of the
// CryptMsgGetParam() with CMSG_BARE_CONTENT_PARAM above. So close the message and re-do its
// creation steps, but now with an amended aSignerInfo.
CRYPT_INTEGER_BLOB aTimestampBlob;
aTimestampBlob.cbData = pTsContext->cbEncoded;
aTimestampBlob.pbData = pTsContext->pbEncoded;
CRYPT_ATTRIBUTE aTimestampAttribute;
aTimestampAttribute.pszObjId = const_cast<LPSTR>(
"1.2.840.113549.1.9.16.2.14");
aTimestampAttribute.cValue = 1;
aTimestampAttribute.rgValue = &aTimestampBlob;
aSignerInfo.cUnauthAttr = 1;
aSignerInfo.rgUnauthAttr = &aTimestampAttribute;
CryptMsgClose(hMsg);
hMsg = CryptMsgOpenToEncode(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
CMSG_DETACHED_FLAG,
CMSG_SIGNED,
&aSignedInfo,
nullptr,
nullptr);
for (size_t i = 0; i < m_dataBlocks.size(); ++i)
{
const bool last = (i == m_dataBlocks.size() - 1);
if (!hMsg ||
!CryptMsgUpdate(hMsg, static_cast<const BYTE *>(m_dataBlocks[i].first), m_dataBlocks[i].second, last))
{
SAL_WARN("svl.crypto", "Re-creating the message failed: " << WindowsErrorString(GetLastError()));
CryptMemFree(pTsContext);
CryptMsgClose(hDecodedMsg);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
}
CryptMsgClose(hDecodedMsg);
}
DWORD nSigLen = 0;
if (!CryptMsgGetParam(hMsg, CMSG_CONTENT_PARAM, 0, nullptr, &nSigLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_CONTENT_PARAM) failed: " << WindowsErrorString(GetLastError()));
if (pTsContext)
CryptMemFree(pTsContext);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
if (nSigLen*2 > MAX_SIGNATURE_CONTENT_LENGTH)
{
SAL_WARN("svl.crypto", "Signature requires more space (" << nSigLen*2 << ") than we reserved (" << MAX_SIGNATURE_CONTENT_LENGTH << ")");
if (pTsContext)
CryptMemFree(pTsContext);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
SAL_INFO("svl.crypto", "Signature size is " << nSigLen << " bytes");
std::unique_ptr<BYTE[]> pSig(new BYTE[nSigLen]);
if (!CryptMsgGetParam(hMsg, CMSG_CONTENT_PARAM, 0, pSig.get(), &nSigLen))
{
SAL_WARN("svl.crypto", "CryptMsgGetParam(CMSG_CONTENT_PARAM) failed: " << WindowsErrorString(GetLastError()));
if (pTsContext)
CryptMemFree(pTsContext);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
return false;
}
// Release resources
if (pTsContext)
CryptMemFree(pTsContext);
CryptMsgClose(hMsg);
CertFreeCertificateContext(pCertContext);
for (unsigned int i = 0; i < nSigLen ; i++)
appendHex(pSig[i], rCMSHexBuffer);
return true;
#endif // USE_CRYPTO_MSCAPI
#endif // USE_CRYPTO_ANY
}
namespace
{
#if USE_CRYPTO_NSS
/// Similar to NSS_CMSAttributeArray_FindAttrByOidTag(), but works directly with a SECOidData.
NSSCMSAttribute* CMSAttributeArray_FindAttrByOidData(NSSCMSAttribute** attrs, SECOidData const * oid, PRBool only)
{
NSSCMSAttribute* attr1, *attr2;
if (attrs == nullptr)
return nullptr;
if (oid == nullptr)
return nullptr;
while ((attr1 = *attrs++) != nullptr)
{
if (attr1->type.len == oid->oid.len && PORT_Memcmp(attr1->type.data,
oid->oid.data,
oid->oid.len) == 0)
break;
}
if (attr1 == nullptr)
return nullptr;
if (!only)
return attr1;
while ((attr2 = *attrs++) != nullptr)
{
if (attr2->type.len == oid->oid.len && PORT_Memcmp(attr2->type.data,
oid->oid.data,
oid->oid.len) == 0)
break;
}
if (attr2 != nullptr)
return nullptr;
return attr1;
}
/// Same as SEC_StringToOID(), which is private to us.
SECStatus StringToOID(SECItem* to, const char* from, PRUint32 len)
{
PRUint32 decimal_numbers = 0;
PRUint32 result_bytes = 0;
SECStatus rv;
PRUint8 result[1024];
static const PRUint32 max_decimal = 0xffffffff / 10;
static const char OIDstring[] = {"OID."};
if (!from || !to)
{
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!len)
{
len = PL_strlen(from);
}
if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4))
{
from += 4; /* skip leading "OID." if present */
len -= 4;
}
if (!len)
{
bad_data:
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
do
{
PRUint32 decimal = 0;
while (len > 0 && rtl::isAsciiDigit(static_cast<unsigned char>(*from)))
{
PRUint32 addend = *from++ - '0';
--len;
if (decimal > max_decimal) /* overflow */
goto bad_data;
decimal = (decimal * 10) + addend;
if (decimal < addend) /* overflow */
goto bad_data;
}
if (len != 0 && *from != '.')
{
goto bad_data;
}
if (decimal_numbers == 0)
{
if (decimal > 2)
goto bad_data;
result[0] = decimal * 40;
result_bytes = 1;
}
else if (decimal_numbers == 1)
{
if (decimal > 40)
goto bad_data;
result[0] += decimal;
}
else
{
/* encode the decimal number, */
PRUint8* rp;
PRUint32 num_bytes = 0;
PRUint32 tmp = decimal;
while (tmp)
{
num_bytes++;
tmp >>= 7;
}
if (!num_bytes)
++num_bytes; /* use one byte for a zero value */
if (static_cast<size_t>(num_bytes) + result_bytes > sizeof result)
goto bad_data;
tmp = num_bytes;
rp = result + result_bytes - 1;
rp[tmp] = static_cast<PRUint8>(decimal & 0x7f);
decimal >>= 7;
while (--tmp > 0)
{
rp[tmp] = static_cast<PRUint8>(decimal | 0x80);
decimal >>= 7;
}
result_bytes += num_bytes;
}
++decimal_numbers;
if (len > 0) /* skip trailing '.' */
{
++from;
--len;
}
}
while (len > 0);
/* now result contains result_bytes of data */
if (to->data && to->len >= result_bytes)
{
to->len = result_bytes;
PORT_Memcpy(to->data, result, to->len);
rv = SECSuccess;
}
else
{
SECItem result_item = {siBuffer, nullptr, 0 };
result_item.data = result;
result_item.len = result_bytes;
rv = SECITEM_CopyItem(nullptr, to, &result_item);
}
return rv;
}
#elif USE_CRYPTO_MSCAPI // ends USE_CRYPTO_NSS
/// Verifies a non-detached signature using CryptoAPI.
bool VerifyNonDetachedSignature(const std::vector<unsigned char>& aData, const std::vector<BYTE>& rExpectedHash)
{
HCRYPTPROV hProv = 0;
if (!CryptAcquireContextW(&hProv, nullptr, nullptr, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
{
SAL_WARN("svl.crypto", "CryptAcquireContext() failed");
return false;
}
HCRYPTHASH hHash = 0;
if (!CryptCreateHash(hProv, CALG_SHA1, 0, 0, &hHash))
{
SAL_WARN("svl.crypto", "CryptCreateHash() failed");
return false;
}
if (!CryptHashData(hHash, aData.data(), aData.size(), 0))
{
SAL_WARN("svl.crypto", "CryptHashData() failed");
return false;
}
DWORD nActualHash = 0;
if (!CryptGetHashParam(hHash, HP_HASHVAL, nullptr, &nActualHash, 0))
{
SAL_WARN("svl.crypto", "CryptGetHashParam() failed to provide the hash length");
return false;
}
std::vector<unsigned char> aActualHash(nActualHash);
if (!CryptGetHashParam(hHash, HP_HASHVAL, aActualHash.data(), &nActualHash, 0))
{
SAL_WARN("svl.crypto", "CryptGetHashParam() failed to provide the hash");
return false;
}
CryptDestroyHash(hHash);
CryptReleaseContext(hProv, 0);
return aActualHash.size() == rExpectedHash.size() &&
!std::memcmp(aActualHash.data(), rExpectedHash.data(), aActualHash.size());
}
OUString GetSubjectName(PCCERT_CONTEXT pCertContext)
{
OUString subjectName;
// Get Subject name size.
DWORD dwData = CertGetNameStringW(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
0,
nullptr,
nullptr,
0);
if (!dwData)
{
SAL_WARN("svl.crypto", "ValidateSignature: CertGetNameString failed");
return subjectName;
}
// Allocate memory for subject name.
LPWSTR szName = static_cast<LPWSTR>(
LocalAlloc(LPTR, dwData * sizeof(WCHAR)));
if (!szName)
{
SAL_WARN("svl.crypto", "ValidateSignature: Unable to allocate memory for subject name");
return subjectName;
}
// Get subject name.
if (!CertGetNameStringW(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
0,
nullptr,
szName,
dwData))
{
LocalFree(szName);
SAL_WARN("svl.crypto", "ValidateSignature: CertGetNameString failed");
return subjectName;
}
subjectName = o3tl::toU(szName);
LocalFree(szName);
return subjectName;
}
#endif // USE_CRYPTO_MSCAPI
#if USE_CRYPTO_NSS
void ensureNssInit()
{
// e.g. tdf#122599 ensure NSS library is initialized for NSS_CMSMessage_CreateFromDER
css::uno::Reference<css::xml::crypto::XNSSInitializer>
xNSSInitializer = css::xml::crypto::NSSInitializer::create(comphelper::getProcessComponentContext());
// this calls NSS_Init
xNSSInitializer->getDigestContext(css::xml::crypto::DigestID::SHA256,
uno::Sequence<beans::NamedValue>());
}
#endif
} // anonymous namespace
bool Signing::Verify(const std::vector<unsigned char>& aData,
const bool bNonDetached,
const std::vector<unsigned char>& aSignature,
SignatureInformation& rInformation)
{
#if USE_CRYPTO_NSS
// ensure NSS_Init() is called before using NSS_CMSMessage_CreateFromDER
static std::once_flag aInitOnce;
std::call_once(aInitOnce, ensureNssInit);
// Validate the signature.
SECItem aSignatureItem;
aSignatureItem.data = const_cast<unsigned char*>(aSignature.data());
aSignatureItem.len = aSignature.size();
NSSCMSMessage* pCMSMessage = NSS_CMSMessage_CreateFromDER(&aSignatureItem,
/*cb=*/nullptr,
/*cb_arg=*/nullptr,
/*pwfn=*/nullptr,
/*pwfn_arg=*/nullptr,
/*decrypt_key_cb=*/nullptr,
/*decrypt_key_cb_arg=*/nullptr);
if (!NSS_CMSMessage_IsSigned(pCMSMessage))
{
SAL_WARN("svl.crypto", "ValidateSignature: message is not signed");
return false;
}
NSSCMSContentInfo* pCMSContentInfo = NSS_CMSMessage_ContentLevel(pCMSMessage, 0);
if (!pCMSContentInfo)
{
SAL_WARN("svl.crypto", "ValidateSignature: NSS_CMSMessage_ContentLevel() failed");
return false;
}
auto pCMSSignedData = static_cast<NSSCMSSignedData*>(NSS_CMSContentInfo_GetContent(pCMSContentInfo));
if (!pCMSSignedData)
{
SAL_WARN("svl.crypto", "ValidateSignature: NSS_CMSContentInfo_GetContent() failed");
return false;
}
// Import certificates from the signed data temporarily, so it'll be
// possible to verify the signature, even if we didn't have the certificate
// previously.
std::vector<CERTCertificate*> aDocumentCertificates;
for (size_t i = 0; pCMSSignedData->rawCerts[i]; ++i)
aDocumentCertificates.push_back(CERT_NewTempCertificate(CERT_GetDefaultCertDB(), pCMSSignedData->rawCerts[i], nullptr, 0, 0));
NSSCMSSignerInfo* pCMSSignerInfo = NSS_CMSSignedData_GetSignerInfo(pCMSSignedData, 0);
if (!pCMSSignerInfo)
{
SAL_WARN("svl.crypto", "ValidateSignature: NSS_CMSSignedData_GetSignerInfo() failed");
return false;
}
SECItem aAlgorithm = NSS_CMSSignedData_GetDigestAlgs(pCMSSignedData)[0]->algorithm;
SECOidTag eOidTag = SECOID_FindOIDTag(&aAlgorithm);
// Map a sign algorithm to a digest algorithm.
// See NSS_CMSUtil_MapSignAlgs(), which is private to us.
switch (eOidTag)
{
case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION:
eOidTag = SEC_OID_SHA1;
break;
case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
eOidTag = SEC_OID_SHA256;
break;
case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
eOidTag = SEC_OID_SHA512;
break;
default:
break;
}
HASH_HashType eHashType = HASH_GetHashTypeByOidTag(eOidTag);
HASHContext* pHASHContext = HASH_Create(eHashType);
if (!pHASHContext)
{
SAL_WARN("svl.crypto", "ValidateSignature: HASH_Create() failed");
return false;
}
// We have a hash, update it with the byte ranges.
HASH_Update(pHASHContext, aData.data(), aData.size());
// Find out what is the expected length of the hash.
unsigned int nMaxResultLen = 0;
switch (eOidTag)
{
case SEC_OID_SHA1:
nMaxResultLen = comphelper::SHA1_HASH_LENGTH;
rInformation.nDigestID = xml::crypto::DigestID::SHA1;
break;
case SEC_OID_SHA256:
nMaxResultLen = comphelper::SHA256_HASH_LENGTH;
rInformation.nDigestID = xml::crypto::DigestID::SHA256;
break;
case SEC_OID_SHA512:
nMaxResultLen = comphelper::SHA512_HASH_LENGTH;
rInformation.nDigestID = xml::crypto::DigestID::SHA512;
break;
default:
SAL_WARN("svl.crypto", "ValidateSignature: unrecognized algorithm");
return false;
}
auto pActualResultBuffer = static_cast<unsigned char*>(PORT_Alloc(nMaxResultLen));
unsigned int nActualResultLen;
HASH_End(pHASHContext, pActualResultBuffer, &nActualResultLen, nMaxResultLen);
CERTCertificate* pCertificate = NSS_CMSSignerInfo_GetSigningCertificate(pCMSSignerInfo, CERT_GetDefaultCertDB());
if (!pCertificate)
{
SAL_WARN("svl.crypto", "ValidateSignature: NSS_CMSSignerInfo_GetSigningCertificate() failed");
return false;
}
else
{
uno::Sequence<sal_Int8> aDerCert(pCertificate->derCert.len);
auto aDerCertRange = asNonConstRange(aDerCert);
for (size_t i = 0; i < pCertificate->derCert.len; ++i)
aDerCertRange[i] = pCertificate->derCert.data[i];
OUStringBuffer aBuffer;
comphelper::Base64::encode(aBuffer, aDerCert);
SignatureInformation::X509Data temp;
temp.emplace_back();
temp.back().X509Certificate = aBuffer.makeStringAndClear();
temp.back().X509Subject = OUString(pCertificate->subjectName, PL_strlen(pCertificate->subjectName), RTL_TEXTENCODING_UTF8);
rInformation.X509Datas.clear();
rInformation.X509Datas.emplace_back(temp);
}
PRTime nSigningTime;
// This may fail, in which case the date should be taken from the PDF's dictionary's "M" key,
// so not critical for PDF at least.
if (NSS_CMSSignerInfo_GetSigningTime(pCMSSignerInfo, &nSigningTime) == SECSuccess)
{
// First convert the UTC UNIX timestamp to a tools::DateTime.
// nSigningTime is in microseconds.
DateTime aDateTime = DateTime::CreateFromUnixTime(static_cast<double>(nSigningTime) / 1000000);
// Then convert to a local UNO DateTime.
aDateTime.ConvertToLocalTime();
rInformation.stDateTime = aDateTime.GetUNODateTime();
if (rInformation.ouDateTime.isEmpty())
{
OUStringBuffer rBuffer;
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetYear()));
rBuffer.append('-');
if (aDateTime.GetMonth() < 10)
rBuffer.append('0');
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetMonth()));
rBuffer.append('-');
if (aDateTime.GetDay() < 10)
rBuffer.append('0');
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetDay()));
rInformation.ouDateTime = rBuffer.makeStringAndClear();
}
}
// Check if we have a signing certificate attribute.
SECOidData aOidData;
aOidData.oid.data = nullptr;
/*
* id-aa-signingCertificateV2 OBJECT IDENTIFIER ::=
* { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
* smime(16) id-aa(2) 47 }
*/
if (StringToOID(&aOidData.oid, "1.2.840.113549.1.9.16.2.47", 0) != SECSuccess)
{
SAL_WARN("svl.crypto", "StringToOID() failed");
return false;
}
aOidData.offset = SEC_OID_UNKNOWN;
aOidData.desc = "id-aa-signingCertificateV2";
aOidData.mechanism = CKM_SHA_1;
aOidData.supportedExtension = UNSUPPORTED_CERT_EXTENSION;
NSSCMSAttribute* pAttribute = CMSAttributeArray_FindAttrByOidData(pCMSSignerInfo->authAttr, &aOidData, PR_TRUE);
if (pAttribute)
rInformation.bHasSigningCertificate = true;
SECItem aSignedDigestItem {siBuffer, nullptr, 0};
SECItem* pContentInfoContentData = pCMSSignedData->contentInfo.content.data;
if (bNonDetached && pContentInfoContentData && pContentInfoContentData->data)
{
// Not a detached signature.
if (nActualResultLen == pContentInfoContentData->len &&
!std::memcmp(pActualResultBuffer, pContentInfoContentData->data, nMaxResultLen) &&
HASH_HashBuf(eHashType, pActualResultBuffer, pContentInfoContentData->data, nActualResultLen) == SECSuccess)
{
aSignedDigestItem.data = pActualResultBuffer;
aSignedDigestItem.len = nActualResultLen;
}
}
else
{
// Detached, the usual case.
aSignedDigestItem.data = pActualResultBuffer;
aSignedDigestItem.len = nActualResultLen;
}
if (aSignedDigestItem.data && NSS_CMSSignerInfo_Verify(pCMSSignerInfo, &aSignedDigestItem, nullptr) == SECSuccess)
rInformation.nStatus = xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
// Everything went fine
SECITEM_FreeItem(&aOidData.oid, false);
PORT_Free(pActualResultBuffer);
HASH_Destroy(pHASHContext);
NSS_CMSSignerInfo_Destroy(pCMSSignerInfo);
for (auto pDocumentCertificate : aDocumentCertificates)
CERT_DestroyCertificate(pDocumentCertificate);
return true;
#elif USE_CRYPTO_MSCAPI // ends USE_CRYPTO_NSS
// Open a message for decoding.
HCRYPTMSG hMsg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
CMSG_DETACHED_FLAG,
0,
0,
nullptr,
nullptr);
if (!hMsg)
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgOpenToDecode() failed");
return false;
}
// Update the message with the encoded header blob.
if (!CryptMsgUpdate(hMsg, aSignature.data(), aSignature.size(), TRUE))
{
SAL_WARN("svl.crypto", "ValidateSignature, CryptMsgUpdate() for the header failed: " << WindowsErrorString(GetLastError()));
return false;
}
if (!bNonDetached)
{
// Update the message with the content blob.
if (!CryptMsgUpdate(hMsg, aData.data(), aData.size(), FALSE))
{
SAL_WARN("svl.crypto", "ValidateSignature, CryptMsgUpdate() for the content failed: " << WindowsErrorString(GetLastError()));
return false;
}
if (!CryptMsgUpdate(hMsg, nullptr, 0, TRUE))
{
SAL_WARN("svl.crypto", "ValidateSignature, CryptMsgUpdate() for the last content failed: " << WindowsErrorString(GetLastError()));
return false;
}
}
// Get the CRYPT_ALGORITHM_IDENTIFIER from the message.
DWORD nDigestID = 0;
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_HASH_ALGORITHM_PARAM, 0, nullptr, &nDigestID))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed: " << WindowsErrorString(GetLastError()));
return false;
}
std::unique_ptr<BYTE[]> pDigestBytes(new BYTE[nDigestID]);
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_HASH_ALGORITHM_PARAM, 0, pDigestBytes.get(), &nDigestID))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed: " << WindowsErrorString(GetLastError()));
return false;
}
auto pDigestID = reinterpret_cast<CRYPT_ALGORITHM_IDENTIFIER*>(pDigestBytes.get());
if (std::string_view(szOID_NIST_sha256) == pDigestID->pszObjId)
rInformation.nDigestID = xml::crypto::DigestID::SHA256;
else if (std::string_view(szOID_RSA_SHA1RSA) == pDigestID->pszObjId || std::string_view(szOID_OIWSEC_sha1) == pDigestID->pszObjId)
rInformation.nDigestID = xml::crypto::DigestID::SHA1;
else
// Don't error out here, we can still verify the message digest correctly, just the digest ID won't be set.
SAL_WARN("svl.crypto", "ValidateSignature: unhandled algorithm identifier '"<<pDigestID->pszObjId<<"'");
// Get the signer CERT_INFO from the message.
DWORD nSignerCertInfo = 0;
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_CERT_INFO_PARAM, 0, nullptr, &nSignerCertInfo))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed");
return false;
}
std::unique_ptr<BYTE[]> pSignerCertInfoBuf(new BYTE[nSignerCertInfo]);
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_CERT_INFO_PARAM, 0, pSignerCertInfoBuf.get(), &nSignerCertInfo))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed");
return false;
}
PCERT_INFO pSignerCertInfo = reinterpret_cast<PCERT_INFO>(pSignerCertInfoBuf.get());
// Open a certificate store in memory using CERT_STORE_PROV_MSG, which
// initializes it with the certificates from the message.
HCERTSTORE hStoreHandle = CertOpenStore(CERT_STORE_PROV_MSG,
PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
0,
0,
hMsg);
if (!hStoreHandle)
{
SAL_WARN("svl.crypto", "ValidateSignature: CertOpenStore() failed");
return false;
}
// Find the signer's certificate in the store.
PCCERT_CONTEXT pSignerCertContext = CertGetSubjectCertificateFromStore(hStoreHandle,
PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
pSignerCertInfo);
if (!pSignerCertContext)
{
SAL_WARN("svl.crypto", "ValidateSignature: CertGetSubjectCertificateFromStore() failed");
return false;
}
else
{
// Write rInformation.ouX509Certificate.
uno::Sequence<sal_Int8> aDerCert(pSignerCertContext->cbCertEncoded);
std::copy_n(pSignerCertContext->pbCertEncoded, pSignerCertContext->cbCertEncoded,
aDerCert.getArray());
OUStringBuffer aBuffer;
comphelper::Base64::encode(aBuffer, aDerCert);
SignatureInformation::X509Data temp;
temp.emplace_back();
temp.back().X509Certificate = aBuffer.makeStringAndClear();
temp.back().X509Subject = GetSubjectName(pSignerCertContext);
rInformation.X509Datas.clear();
rInformation.X509Datas.emplace_back(temp);
}
std::vector<BYTE> aContentParam;
if (bNonDetached)
{
// Not a detached signature.
DWORD nContentParam = 0;
if (!CryptMsgGetParam(hMsg, CMSG_CONTENT_PARAM, 0, nullptr, &nContentParam))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed");
return false;
}
aContentParam.resize(nContentParam);
if (!CryptMsgGetParam(hMsg, CMSG_CONTENT_PARAM, 0, aContentParam.data(), &nContentParam))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() failed");
return false;
}
}
if (!bNonDetached || VerifyNonDetachedSignature(aData, aContentParam))
{
// Use the CERT_INFO from the signer certificate to verify the signature.
if (CryptMsgControl(hMsg, 0, CMSG_CTRL_VERIFY_SIGNATURE, pSignerCertContext->pCertInfo))
rInformation.nStatus = xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
}
// Check if we have a signing certificate attribute.
DWORD nSignedAttributes = 0;
if (CryptMsgGetParam(hMsg, CMSG_SIGNER_AUTH_ATTR_PARAM, 0, nullptr, &nSignedAttributes))
{
std::unique_ptr<BYTE[]> pSignedAttributesBuf(new BYTE[nSignedAttributes]);
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_AUTH_ATTR_PARAM, 0, pSignedAttributesBuf.get(), &nSignedAttributes))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() authenticated failed");
return false;
}
auto pSignedAttributes = reinterpret_cast<PCRYPT_ATTRIBUTES>(pSignedAttributesBuf.get());
for (size_t nAttr = 0; nAttr < pSignedAttributes->cAttr; ++nAttr)
{
CRYPT_ATTRIBUTE& rAttr = pSignedAttributes->rgAttr[nAttr];
/*
* id-aa-signingCertificateV2 OBJECT IDENTIFIER ::=
* { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
* smime(16) id-aa(2) 47 }
*/
if (std::string_view("1.2.840.113549.1.9.16.2.47") == rAttr.pszObjId)
{
rInformation.bHasSigningCertificate = true;
break;
}
}
}
// Get the unauthorized attributes.
nSignedAttributes = 0;
if (CryptMsgGetParam(hMsg, CMSG_SIGNER_UNAUTH_ATTR_PARAM, 0, nullptr, &nSignedAttributes))
{
std::unique_ptr<BYTE[]> pSignedAttributesBuf(new BYTE[nSignedAttributes]);
if (!CryptMsgGetParam(hMsg, CMSG_SIGNER_UNAUTH_ATTR_PARAM, 0, pSignedAttributesBuf.get(), &nSignedAttributes))
{
SAL_WARN("svl.crypto", "ValidateSignature: CryptMsgGetParam() unauthenticated failed");
return false;
}
auto pSignedAttributes = reinterpret_cast<PCRYPT_ATTRIBUTES>(pSignedAttributesBuf.get());
for (size_t nAttr = 0; nAttr < pSignedAttributes->cAttr; ++nAttr)
{
CRYPT_ATTRIBUTE& rAttr = pSignedAttributes->rgAttr[nAttr];
// Timestamp blob
if (std::string_view("1.2.840.113549.1.9.16.2.14") == rAttr.pszObjId)
{
PCRYPT_TIMESTAMP_CONTEXT pTsContext;
if (!CryptVerifyTimeStampSignature(rAttr.rgValue->pbData, rAttr.rgValue->cbData, nullptr, 0, nullptr, &pTsContext, nullptr, nullptr))
{
SAL_WARN("svl.crypto", "CryptMsgUpdate failed: " << WindowsErrorString(GetLastError()));
break;
}
DateTime aDateTime = DateTime::CreateFromWin32FileDateTime(pTsContext->pTimeStamp->ftTime.dwLowDateTime, pTsContext->pTimeStamp->ftTime.dwHighDateTime);
// Then convert to a local UNO DateTime.
aDateTime.ConvertToLocalTime();
rInformation.stDateTime = aDateTime.GetUNODateTime();
if (rInformation.ouDateTime.isEmpty())
{
OUStringBuffer rBuffer;
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetYear()));
rBuffer.append('-');
if (aDateTime.GetMonth() < 10)
rBuffer.append('0');
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetMonth()));
rBuffer.append('-');
if (aDateTime.GetDay() < 10)
rBuffer.append('0');
rBuffer.append(static_cast<sal_Int32>(aDateTime.GetDay()));
rInformation.ouDateTime = rBuffer.makeStringAndClear();
}
break;
}
}
}
CertCloseStore(hStoreHandle, CERT_CLOSE_STORE_FORCE_FLAG);
CryptMsgClose(hMsg);
return true;
#else
// Not implemented.
(void)aData;
(void)bNonDetached;
(void)aSignature;
(void)rInformation;
return false;
#endif
}
bool Signing::Verify(SvStream& rStream,
const std::vector<std::pair<size_t, size_t>>& aByteRanges,
const bool bNonDetached,
const std::vector<unsigned char>& aSignature,
SignatureInformation& rInformation)
{
#if USE_CRYPTO_ANY
std::vector<unsigned char> buffer;
// Copy the byte ranges into a single buffer.
for (const auto& rByteRange : aByteRanges)
{
rStream.Seek(rByteRange.first);
const size_t size = buffer.size();
buffer.resize(size + rByteRange.second);
rStream.ReadBytes(buffer.data() + size, rByteRange.second);
}
return Verify(buffer, bNonDetached, aSignature, rInformation);
#else
// Not implemented.
(void)rStream;
(void)aByteRanges;
(void)bNonDetached;
(void)aSignature;
(void)rInformation;
return false;
#endif
}
void Signing::appendHex(sal_Int8 nInt, OStringBuffer& rBuffer)
{
static const char pHexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
rBuffer.append( pHexDigits[ (nInt >> 4) & 15 ] );
rBuffer.append( pHexDigits[ nInt & 15 ] );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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