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Diffstat (limited to 'include/comphelper/docpasswordhelper.hxx')
| -rw-r--r-- | include/comphelper/docpasswordhelper.hxx | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/include/comphelper/docpasswordhelper.hxx b/include/comphelper/docpasswordhelper.hxx new file mode 100644 index 000000000..64d7ba978 --- /dev/null +++ b/include/comphelper/docpasswordhelper.hxx @@ -0,0 +1,447 @@ +/* -*- 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_COMPHELPER_DOCPASSWORDHELPER_HXX +#define INCLUDED_COMPHELPER_DOCPASSWORDHELPER_HXX + +#include <comphelper/comphelperdllapi.h> +#include <string_view> +#include <vector> +#include <comphelper/docpasswordrequest.hxx> +#include <comphelper/hash.hxx> + +namespace com::sun::star::task { class XInteractionHandler; } +namespace com::sun::star::beans { struct PropertyValue; } +namespace com::sun::star::beans { struct NamedValue; } + +namespace comphelper { + +enum class DocPasswordVerifierResult +{ + OK, + WrongPassword, + Abort +}; + + +/** Base class for a password verifier used by the DocPasswordHelper class + below. + + Users have to implement the virtual functions and pass an instance of the + verifier to one of the password request functions. + */ +class COMPHELPER_DLLPUBLIC IDocPasswordVerifier +{ +public: + virtual ~IDocPasswordVerifier(); + + /** Will be called every time a password needs to be verified. + + @param rPassword + The password to be verified + + @param o_rEncryptionData + Output parameter, that is filled with the EncryptionData generated + from the password. The data is filled only if the validation was + successful. + + @return The result of the verification. + - DocPasswordVerifierResult_OK, if and only if the passed password + is valid and can be used to process the related document. + - DocPasswordVerifierResult_WRONG_PASSWORD, if the password is + wrong. The user may be asked again for a new password. + - DocPasswordVerifierResult_ABORT, if an unrecoverable error + occurred while password verification. The password request loop + will be aborted. + */ + virtual DocPasswordVerifierResult verifyPassword( const OUString& rPassword, css::uno::Sequence< css::beans::NamedValue >& o_rEncryptionData ) = 0; + + /** Will be called every time an encryption data needs to be verified. + + @param rEncryptionData + The data will be validated + + @return The result of the verification. + - DocPasswordVerifierResult_OK, if and only if the passed encryption data + is valid and can be used to process the related document. + - DocPasswordVerifierResult_WRONG_PASSWORD, if the encryption data is + wrong. + - DocPasswordVerifierResult_ABORT, if an unrecoverable error + occurred while data verification. The password request loop + will be aborted. + */ + virtual DocPasswordVerifierResult verifyEncryptionData( const css::uno::Sequence< css::beans::NamedValue >& o_rEncryptionData ) = 0; + +}; + + +/** Helper that asks for a document password and checks its validity. + */ +class COMPHELPER_DLLPUBLIC DocPasswordHelper +{ +public: + + + /** This helper function generates the information related + to "Password to modify" provided by user. The result + sequence contains the hash and the algorithm-related + info. + + @param aString + The string for which the info should be generated + + @return + The sequence containing the hash and the algorithm-related info + */ + + static css::uno::Sequence< css::beans::PropertyValue > + GenerateNewModifyPasswordInfo( std::u16string_view aPassword ); + + /** This helper function converts a grab-bagged password, e.g. the + trackChanges password which has no complete inner equivalent to + the inner format. The result sequence contains the hash and the + algorithm-related info to use e.g. in IsModifyPasswordCorrect(). + + @param aInfo + The sequence containing the hash and the algorithm-related info + according to the OOXML origin, used by grab-bagging. + + @return + The sequence containing the hash and the algorithm-related info + in the inner format. + */ + + static css::uno::Sequence< css::beans::PropertyValue > ConvertPasswordInfo( + const css::uno::Sequence< css::beans::PropertyValue >& aInfo ); + + static css::uno::Sequence<css::beans::PropertyValue> + GenerateNewModifyPasswordInfoOOXML(std::u16string_view aPassword); + + /** This helper function allows to check whether + the "Password to modify" provided by user is the correct one. + + @param aString + The string containing the provided password + + @param aInfo + The sequence containing the hash and the algorithm-info + + @return + <TRUE/> if the password is correct one + <FALSE/> otherwise + */ + + static bool IsModifyPasswordCorrect( + std::u16string_view aPassword, + const css::uno::Sequence< css::beans::PropertyValue >& aInfo ); + + + /** This helper function generates the hash code based on the algorithm + specified by MS for "Password to modify" feature of Word. + + @param aString + The string for which the hash should be calculated + + @return + The hash represented by sal_uInt32 + */ + + static sal_uInt32 GetWordHashAsUINT32( std::u16string_view aString ); + + + /** This helper function generates the hash code based on the algorithm + specified by MS for "Password to modify" and passwords related to + table protection of Excel. + + @param aString + The string for which the hash should be calculated + + @param nEnc + The encoding that should be used to generate the 8-bit string + before the hash is generated + + @return + The hash represented by sal_uInt16 + */ + + static sal_uInt16 GetXLHashAsUINT16( + std::u16string_view aString, + rtl_TextEncoding nEnc = RTL_TEXTENCODING_UTF8 ); + + + /** This helper function generates the hash code based on the algorithm + specified by MS for "Password to modify" and passwords related to + table protection. + + @param aString + The string for which the hash should be calculated + + @return + The hash represented by sequence of bytes in BigEndian form + */ + + static css::uno::Sequence< sal_Int8 > GetXLHashAsSequence( + std::u16string_view aString ); + + + /** Convenience function to calculate a salted hash with iterations as + specified in https://msdn.microsoft.com/en-us/library/dd920692 for the + OOXML sheetProtection and fileSharing elements, or + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 for Standard and + Agile Encryption. + + @param rPassword + UTF-16 encoded string without leading BOM character + + @param rSaltValue + Base64 encoded salt that will be decoded and prepended to password + data. + + @param nSpinCount + If >0 the number of repeated iterations. + + @param eIterCount + If Hash::IterCount::APPEND, append iteration count as per + https://msdn.microsoft.com/en-us/library/dd920692 + If Hash::IterCount::PREPEND, prepend iteration count as per + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 + If Hash::IterCount::NONE, do not add the iteration count to hash + iterations. + + @param rAlgorithmName + One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in + https://msdn.microsoft.com/en-us/library/dd920692 + or "SHA512", "SHA256", ... as listed for HashAlgorithm in + https://msdn.microsoft.com/en-us/library/dd925810 + that have a valid match in comphelper::HashType. If not, an + empty sequence is returned. Not all algorithm names are + supported. + + @return the raw hash value as sal_Int8 sequence. + */ + static css::uno::Sequence<sal_Int8> GetOoxHashAsSequence( + const OUString& rPassword, + std::u16string_view rSaltValue, + sal_uInt32 nSpinCount, + comphelper::Hash::IterCount eIterCount, + std::u16string_view rAlgorithmName); + + + /** Convenience function to calculate a salted hash with iterations as + specified in https://msdn.microsoft.com/en-us/library/dd920692 for the + OOXML sheetProtection and fileSharing elements, or + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 for Standard and + Agile Encryption. + + @param rPassword + UTF-16 encoded string without leading BOM character + + @param rSaltValue + Base64 encoded salt that will be decoded and prepended to password + data. + + @param nSpinCount + If >0 the number of repeated iterations. + + @param eIterCount + If Hash::IterCount::APPEND, append iteration count as per + https://msdn.microsoft.com/en-us/library/dd920692 + If Hash::IterCount::PREPEND, prepend iteration count as per + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 + If Hash::IterCount::NONE, do not add the iteration count to hash + iterations. + + @param rAlgorithmName + One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in + https://msdn.microsoft.com/en-us/library/dd920692 + or "SHA512", "SHA256", ... as listed for HashAlgorithm in + https://msdn.microsoft.com/en-us/library/dd925810 + that have a valid match in comphelper::HashType. If not, an + empty sequence is returned. Not all algorithm names are + supported. + + @return the base64 encoded string of the hash value, that can be + compared against a stored base64 encoded hash value. + */ + static OUString GetOoxHashAsBase64( + const OUString& rPassword, + std::u16string_view rSaltValue, + sal_uInt32 nSpinCount, + comphelper::Hash::IterCount eIterCount, + std::u16string_view rAlgorithmName); + + + /** Convenience function to calculate a salted hash with iterations as + specified in https://msdn.microsoft.com/en-us/library/dd920692 for the + OOXML sheetProtection and fileSharing elements, or + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 for Standard and + Agile Encryption. + + @param rPassword + UTF-16 encoded string without leading BOM character + + @param rSaltValue + A raw salt that will be prepended to password data. + + @param nSpinCount + If >0 the number of repeated iterations. + + @param eIterCount + If Hash::IterCount::APPEND, append iteration count as per + https://msdn.microsoft.com/en-us/library/dd920692 + If Hash::IterCount::PREPEND, prepend iteration count as per + https://msdn.microsoft.com/en-us/library/dd924776 and + https://msdn.microsoft.com/en-us/library/dd925430 + If Hash::IterCount::NONE, do not add the iteration count to hash + iterations. + + @param rAlgorithmName + One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in + https://msdn.microsoft.com/en-us/library/dd920692 + or "SHA512", "SHA256", ... as listed for HashAlgorithm in + https://msdn.microsoft.com/en-us/library/dd925810 + that have a valid match in comphelper::HashType. If not, an + empty sequence is returned. Not all algorithm names are + supported. + + @return the raw the hash value. + */ + static std::vector<unsigned char> GetOoxHashAsVector( + const OUString& rPassword, + const std::vector<unsigned char>& rSaltValue, + sal_uInt32 nSpinCount, + comphelper::Hash::IterCount eIterCount, + std::u16string_view rAlgorithmName); + + + /** This helper function generates a random sequence of bytes of + requested length. + */ + + static css::uno::Sequence< sal_Int8 > GenerateRandomByteSequence( + sal_Int32 nLength ); + + + /** This helper function generates a byte sequence representing the + key digest value used by MSCodec_Std97 codec. + */ + + static css::uno::Sequence< sal_Int8 > GenerateStd97Key( + std::u16string_view aPassword, + const css::uno::Sequence< sal_Int8 >& aDocId ); + + + /** This helper function generates a byte sequence representing the + key digest value used by MSCodec_Std97 codec. + */ + + static css::uno::Sequence< sal_Int8 > GenerateStd97Key( + const sal_uInt16 pPassData[16], + const css::uno::Sequence< sal_Int8 >& aDocId ); + + /** This helper function generates a byte sequence representing the + key digest value used by MSCodec_Std97 codec. + */ + + static css::uno::Sequence< sal_Int8 > GenerateStd97Key( + const sal_uInt16 pPassData[16], + const sal_uInt8 pDocId[16] ); + + + /** This helper function tries to request and verify a password to load a + protected document. + + First, the list of default passwords will be tried if provided. This is + needed by import filters for external file formats that have to check a + predefined password in some cases without asking the user for a + password. Every password is checked using the passed password verifier. + + If not successful, the passed password of a medium is tried, that has + been set e.g. by an API call to load a document. If existing, the + password is checked using the passed password verifier. + + If still not successful, the passed interaction handler is used to + request a password from the user. This will be repeated until the + passed password verifier validates the entered password, or if the user + chooses to cancel password input. + + @param rVerifier + The password verifier used to check every processed password. + + @param rMediaPassword + If not empty, will be passed to the password validator before + requesting a password from the user. This password usually should + be querried from a media descriptor. + + @param rxInteractHandler + The interaction handler that will be used to request a password + from the user, e.g. by showing a password input dialog. + + @param rDocumentUrl + The URL of the related document that will be shown in the password + input dialog. + + @param eRequestType + The password request type that will be passed to the + DocPasswordRequest object created internally. See + docpasswordrequest.hxx for more details. + + @param pDefaultPasswords + If not null, contains default passwords that will be tried before a + password will be requested from the media descriptor or the user. + + @param pbIsDefaultPassword + (output parameter) If not null, the type of the found password will + be returned. True means the password has been found in the passed + list of default passwords. False means the password has been taken + from the rMediaPassword parameter or has been entered by the user. + + @return + If not empty, contains the password that has been validated by the + passed password verifier. If empty, no valid password has been + found, or the user has chosen to cancel password input. + */ + static css::uno::Sequence< css::beans::NamedValue > requestAndVerifyDocPassword( + IDocPasswordVerifier& rVerifier, + const css::uno::Sequence< css::beans::NamedValue >& rMediaEncData, + const OUString& rMediaPassword, + const css::uno::Reference< css::task::XInteractionHandler >& rxInteractHandler, + const OUString& rDocumentUrl, + DocPasswordRequestType eRequestType, + const ::std::vector< OUString >* pDefaultPasswords = nullptr, + bool* pbIsDefaultPassword = nullptr ); + + static css::uno::Sequence< css::beans::NamedValue > decryptGpgSession( + const css::uno::Sequence< css::uno::Sequence< css::beans::NamedValue > >& rGpgProperties); + +private: + ~DocPasswordHelper(); +}; + + +} // namespace comphelper + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |