include/comphelper/docpasswordhelper.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_COMPHELPER_DOCPASSWORDHELPER_HXX
  21 #define INCLUDED_COMPHELPER_DOCPASSWORDHELPER_HXX
  22
  23 #include <comphelper/comphelperdllapi.h>
  24 #include <string_view>
  25 #include <vector>
  26 #include <comphelper/docpasswordrequest.hxx>
  27 #include <comphelper/hash.hxx>
  28
  29 namespace com::sun::star::task { class XInteractionHandler; }
  30 namespace com::sun::star::beans { struct PropertyValue; }
  31 namespace com::sun::star::beans { struct NamedValue; }
  32
  33 namespace comphelper {
  34
  35 enum class DocPasswordVerifierResult
  36 {
  37     OK,
  38     WrongPassword,
  39     Abort
  40 };
  41
  42
  43 /** Base class for a password verifier used by the DocPasswordHelper class
  44     below.
  45
  46     Users have to implement the virtual functions and pass an instance of the
  47     verifier to one of the password request functions.
  48  */
  49 class COMPHELPER_DLLPUBLIC IDocPasswordVerifier
  50 {
  51 public:
  52     virtual             ~IDocPasswordVerifier();
  53
  54     /** Will be called every time a password needs to be verified.
  55
  56         @param rPassword
  57             The password to be verified
  58
  59         @param o_rEncryptionData
  60             Output parameter, that is filled with the EncryptionData generated
  61             from the password. The data is filled only if the validation was
  62             successful.
  63
  64         @return  The result of the verification.
  65             - DocPasswordVerifierResult_OK, if and only if the passed password
  66               is valid and can be used to process the related document.
  67             - DocPasswordVerifierResult_WRONG_PASSWORD, if the password is
  68               wrong. The user may be asked again for a new password.
  69             - DocPasswordVerifierResult_ABORT, if an unrecoverable error
  70               occurred while password verification. The password request loop
  71               will be aborted.
  72      */
  73     virtual DocPasswordVerifierResult verifyPassword( const OUString& rPassword, css::uno::Sequence< css::beans::NamedValue >& o_rEncryptionData ) = 0;
  74
  75     /** Will be called every time an encryption data needs to be verified.
  76
  77         @param rEncryptionData
  78             The data will be validated
  79
  80         @return  The result of the verification.
  81             - DocPasswordVerifierResult_OK, if and only if the passed encryption data
  82               is valid and can be used to process the related document.
  83             - DocPasswordVerifierResult_WRONG_PASSWORD, if the encryption data is
  84               wrong.
  85             - DocPasswordVerifierResult_ABORT, if an unrecoverable error
  86               occurred while data verification. The password request loop
  87               will be aborted.
  88      */
  89     virtual DocPasswordVerifierResult verifyEncryptionData( const css::uno::Sequence< css::beans::NamedValue >& o_rEncryptionData ) = 0;
  90
  91 };
  92
  93
  94 /** Helper that asks for a document password and checks its validity.
  95  */
  96 class COMPHELPER_DLLPUBLIC DocPasswordHelper
  97 {
  98 public:
  99
 100
 101     /** This helper function generates the information related
 102         to "Password to modify" provided by user. The result
 103         sequence contains the hash and the algorithm-related
 104         info.
 105
 106         @param aString
 107             The string for which the info should be generated
 108
 109         @return
 110             The sequence containing the hash and the algorithm-related info
 111       */
 112
 113     static css::uno::Sequence< css::beans::PropertyValue >
 114         GenerateNewModifyPasswordInfo( std::u16string_view aPassword );
 115
 116     /** This helper function converts a grab-bagged password, e.g. the
 117         trackChanges password which has no complete inner equivalent to
 118         the inner format. The result sequence contains the hash and the
 119         algorithm-related info to use e.g. in IsModifyPasswordCorrect().
 120
 121         @param aInfo
 122             The sequence containing the hash and the algorithm-related info
 123             according to the OOXML origin, used by grab-bagging.
 124
 125         @return
 126             The sequence containing the hash and the algorithm-related info
 127             in the inner format.
 128       */
 129
 130     static css::uno::Sequence< css::beans::PropertyValue > ConvertPasswordInfo(
 131         const css::uno::Sequence< css::beans::PropertyValue >& aInfo );
 132
 133     static css::uno::Sequence<css::beans::PropertyValue>
 134     GenerateNewModifyPasswordInfoOOXML(std::u16string_view aPassword);
 135
 136     /** This helper function allows to check whether
 137         the "Password to modify" provided by user is the correct one.
 138
 139         @param aString
 140             The string containing the provided password
 141
 142         @param aInfo
 143             The sequence containing the hash and the algorithm-info
 144
 145         @return
 146             <TRUE/> if the password is correct one
 147             <FALSE/> otherwise
 148       */
 149
 150     static bool IsModifyPasswordCorrect(
 151                 std::u16string_view aPassword,
 152                 const css::uno::Sequence< css::beans::PropertyValue >& aInfo );
 153
 154
 155     /** This helper function generates the hash code based on the algorithm
 156         specified by MS for "Password to modify" feature of Word.
 157
 158         @param aString
 159             The string for which the hash should be calculated
 160
 161         @return
 162             The hash represented by sal_uInt32
 163       */
 164
 165     static sal_uInt32 GetWordHashAsUINT32( std::u16string_view aString );
 166
 167
 168     /** This helper function generates the hash code based on the algorithm
 169         specified by MS for "Password to modify" and passwords related to
 170         table protection of Excel.
 171
 172         @param aString
 173             The string for which the hash should be calculated
 174
 175         @param nEnc
 176             The encoding that should be used to generate the 8-bit string
 177             before the hash is generated
 178
 179         @return
 180             The hash represented by sal_uInt16
 181       */
 182
 183     static sal_uInt16 GetXLHashAsUINT16(
 184                 std::u16string_view aString,
 185                 rtl_TextEncoding nEnc = RTL_TEXTENCODING_UTF8 );
 186
 187
 188     /** This helper function generates the hash code based on the algorithm
 189         specified by MS for "Password to modify" and passwords related to
 190         table protection.
 191
 192         @param aString
 193             The string for which the hash should be calculated
 194
 195         @return
 196             The hash represented by sequence of bytes in BigEndian form
 197       */
 198
 199     static css::uno::Sequence< sal_Int8 > GetXLHashAsSequence(
 200                 std::u16string_view aString );
 201
 202
 203     /** Convenience function to calculate a salted hash with iterations as
 204         specified in https://msdn.microsoft.com/en-us/library/dd920692 for the
 205         OOXML sheetProtection and fileSharing elements, or
 206         https://msdn.microsoft.com/en-us/library/dd924776 and
 207         https://msdn.microsoft.com/en-us/library/dd925430 for Standard and
 208         Agile Encryption.
 209
 210         @param  rPassword
 211                 UTF-16 encoded string without leading BOM character
 212
 213         @param  rSaltValue
 214                 Base64 encoded salt that will be decoded and prepended to password
 215                 data.
 216
 217         @param  nSpinCount
 218                 If >0 the number of repeated iterations.
 219
 220         @param  eIterCount
 221                 If Hash::IterCount::APPEND, append iteration count as per
 222                 https://msdn.microsoft.com/en-us/library/dd920692
 223                 If Hash::IterCount::PREPEND, prepend iteration count as per
 224                 https://msdn.microsoft.com/en-us/library/dd924776 and
 225                 https://msdn.microsoft.com/en-us/library/dd925430
 226                 If Hash::IterCount::NONE, do not add the iteration count to hash
 227                 iterations.
 228
 229         @param  rAlgorithmName
 230                 One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in
 231                 https://msdn.microsoft.com/en-us/library/dd920692
 232                 or "SHA512", "SHA256", ... as listed for HashAlgorithm in
 233                 https://msdn.microsoft.com/en-us/library/dd925810
 234                 that have a valid match in comphelper::HashType. If not, an
 235                 empty sequence is returned. Not all algorithm names are
 236                 supported.
 237
 238         @return the raw hash value as sal_Int8 sequence.
 239      */
 240     static css::uno::Sequence<sal_Int8> GetOoxHashAsSequence(
 241             const OUString& rPassword,
 242             std::u16string_view rSaltValue,
 243             sal_uInt32 nSpinCount,
 244             comphelper::Hash::IterCount eIterCount,
 245              std::u16string_view rAlgorithmName);
 246
 247
 248     /** Convenience function to calculate a salted hash with iterations as
 249         specified in https://msdn.microsoft.com/en-us/library/dd920692 for the
 250         OOXML sheetProtection and fileSharing elements, or
 251         https://msdn.microsoft.com/en-us/library/dd924776 and
 252         https://msdn.microsoft.com/en-us/library/dd925430 for Standard and
 253         Agile Encryption.
 254
 255         @param  rPassword
 256                 UTF-16 encoded string without leading BOM character
 257
 258         @param  rSaltValue
 259                 Base64 encoded salt that will be decoded and prepended to password
 260                 data.
 261
 262         @param  nSpinCount
 263                 If >0 the number of repeated iterations.
 264
 265         @param  eIterCount
 266                 If Hash::IterCount::APPEND, append iteration count as per
 267                 https://msdn.microsoft.com/en-us/library/dd920692
 268                 If Hash::IterCount::PREPEND, prepend iteration count as per
 269                 https://msdn.microsoft.com/en-us/library/dd924776 and
 270                 https://msdn.microsoft.com/en-us/library/dd925430
 271                 If Hash::IterCount::NONE, do not add the iteration count to hash
 272                 iterations.
 273
 274         @param  rAlgorithmName
 275                 One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in
 276                 https://msdn.microsoft.com/en-us/library/dd920692
 277                 or "SHA512", "SHA256", ... as listed for HashAlgorithm in
 278                 https://msdn.microsoft.com/en-us/library/dd925810
 279                 that have a valid match in comphelper::HashType. If not, an
 280                 empty sequence is returned. Not all algorithm names are
 281                 supported.
 282
 283         @return the base64 encoded string of the hash value, that can be
 284                 compared against a stored base64 encoded hash value.
 285      */
 286     static OUString GetOoxHashAsBase64(
 287             const OUString& rPassword,
 288             std::u16string_view rSaltValue,
 289             sal_uInt32 nSpinCount,
 290             comphelper::Hash::IterCount eIterCount,
 291             std::u16string_view rAlgorithmName);
 292
 293
 294     /** Convenience function to calculate a salted hash with iterations as
 295         specified in https://msdn.microsoft.com/en-us/library/dd920692 for the
 296         OOXML sheetProtection and fileSharing elements, or
 297         https://msdn.microsoft.com/en-us/library/dd924776 and
 298         https://msdn.microsoft.com/en-us/library/dd925430 for Standard and
 299         Agile Encryption.
 300
 301         @param  rPassword
 302                 UTF-16 encoded string without leading BOM character
 303
 304         @param  rSaltValue
 305                 A raw salt that will be prepended to password data.
 306
 307         @param  nSpinCount
 308                 If >0 the number of repeated iterations.
 309
 310         @param  eIterCount
 311                 If Hash::IterCount::APPEND, append iteration count as per
 312                 https://msdn.microsoft.com/en-us/library/dd920692
 313                 If Hash::IterCount::PREPEND, prepend iteration count as per
 314                 https://msdn.microsoft.com/en-us/library/dd924776 and
 315                 https://msdn.microsoft.com/en-us/library/dd925430
 316                 If Hash::IterCount::NONE, do not add the iteration count to hash
 317                 iterations.
 318
 319         @param  rAlgorithmName
 320                 One of "SHA-512", "SHA-256", ... as listed for AlgorithmName in
 321                 https://msdn.microsoft.com/en-us/library/dd920692
 322                 or "SHA512", "SHA256", ... as listed for HashAlgorithm in
 323                 https://msdn.microsoft.com/en-us/library/dd925810
 324                 that have a valid match in comphelper::HashType. If not, an
 325                 empty sequence is returned. Not all algorithm names are
 326                 supported.
 327
 328         @return the raw the hash value.
 329      */
 330     static std::vector<unsigned char> GetOoxHashAsVector(
 331             const OUString& rPassword,
 332             const std::vector<unsigned char>& rSaltValue,
 333             sal_uInt32 nSpinCount,
 334             comphelper::Hash::IterCount eIterCount,
 335             std::u16string_view rAlgorithmName);
 336
 337
 338     /** This helper function generates a random sequence of bytes of
 339         requested length.
 340       */
 341
 342     static css::uno::Sequence< sal_Int8 > GenerateRandomByteSequence(
 343                 sal_Int32 nLength );
 344
 345
 346     /** This helper function generates a byte sequence representing the
 347         key digest value used by MSCodec_Std97 codec.
 348       */
 349
 350     static css::uno::Sequence< sal_Int8 > GenerateStd97Key(
 351                 std::u16string_view aPassword,
 352                 const css::uno::Sequence< sal_Int8 >& aDocId );
 353
 354
 355     /** This helper function generates a byte sequence representing the
 356         key digest value used by MSCodec_Std97 codec.
 357       */
 358
 359     static css::uno::Sequence< sal_Int8 > GenerateStd97Key(
 360                 const sal_uInt16 pPassData[16],
 361                 const css::uno::Sequence< sal_Int8 >& aDocId );
 362
 363     /** This helper function generates a byte sequence representing the
 364         key digest value used by MSCodec_Std97 codec.
 365       */
 366
 367     static css::uno::Sequence< sal_Int8 > GenerateStd97Key(
 368                 const sal_uInt16 pPassData[16],
 369                 const sal_uInt8 pDocId[16] );
 370
 371
 372     /** This helper function tries to request and verify a password to load a
 373         protected document.
 374
 375         First, the list of default passwords will be tried if provided. This is
 376         needed by import filters for external file formats that have to check a
 377         predefined password in some cases without asking the user for a
 378         password. Every password is checked using the passed password verifier.
 379
 380         If not successful, the passed password of a medium is tried, that has
 381         been set e.g. by an API call to load a document. If existing, the
 382         password is checked using the passed password verifier.
 383
 384         If still not successful, the passed interaction handler is used to
 385         request a password from the user. This will be repeated until the
 386         passed password verifier validates the entered password, or if the user
 387         chooses to cancel password input.
 388
 389         @param rVerifier
 390             The password verifier used to check every processed password.
 391
 392         @param rMediaPassword
 393             If not empty, will be passed to the password validator before
 394             requesting a password from the user. This password usually should
 395             be querried from a media descriptor.
 396
 397         @param rxInteractHandler
 398             The interaction handler that will be used to request a password
 399             from the user, e.g. by showing a password input dialog.
 400
 401         @param rDocumentUrl
 402             The URL of the related document that will be shown in the password
 403             input dialog.
 404
 405         @param eRequestType
 406             The password request type that will be passed to the
 407             DocPasswordRequest object created internally. See
 408             docpasswordrequest.hxx for more details.
 409
 410         @param pDefaultPasswords
 411             If not null, contains default passwords that will be tried before a
 412             password will be requested from the media descriptor or the user.
 413
 414         @param pbIsDefaultPassword
 415             (output parameter) If not null, the type of the found password will
 416             be returned. True means the password has been found in the passed
 417             list of default passwords. False means the password has been taken
 418             from the rMediaPassword parameter or has been entered by the user.
 419
 420         @return
 421             If not empty, contains the password that has been validated by the
 422             passed password verifier. If empty, no valid password has been
 423             found, or the user has chosen to cancel password input.
 424      */
 425     static css::uno::Sequence< css::beans::NamedValue > requestAndVerifyDocPassword(
 426                             IDocPasswordVerifier& rVerifier,
 427                             const css::uno::Sequence< css::beans::NamedValue >& rMediaEncData,
 428                             const OUString& rMediaPassword,
 429                             const css::uno::Reference< css::task::XInteractionHandler >& rxInteractHandler,
 430                             const OUString& rDocumentUrl,
 431                             DocPasswordRequestType eRequestType,
 432                             const ::std::vector< OUString >* pDefaultPasswords = nullptr,
 433                             bool* pbIsDefaultPassword = nullptr );
 434
 435     static css::uno::Sequence< css::beans::NamedValue > decryptGpgSession(
 436         const css::uno::Sequence< css::uno::Sequence< css::beans::NamedValue > >& rGpgProperties);
 437
 438 private:
 439                         ~DocPasswordHelper();
 440 };
 441
 442
 443 } // namespace comphelper
 444
 445 #endif
 446
 447 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */