KekSec

srvstamp.c (buffer overflow in SMB protcol 0day 2020) #XPLEAKS

Sep 26th, 2020 (edited)
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  1. /*++
  2.  
  3. Copyright (c) 1991  Microsoft Corporation
  4.  
  5. Module Name:
  6.  
  7.     srvstamp.c
  8.  
  9. Abstract:
  10.  
  11.     This module contains routines for supporting the SrvStamp functionality
  12.    
  13. Author:
  14.  
  15.     David Kruse (dkruse) 23-Oct-2000
  16.  
  17. Revision History:
  18.  
  19. --*/
  20.  
  21. #include "precomp.h"
  22. #include "srvstamp.tmh"
  23. #pragma hdrstop
  24.                    
  25. #ifdef SRVCATCH
  26.  
  27. //
  28. //  Stupid compiler won't convert memcmp( data, constdata, 8 ) into
  29. //  a single 64-bit compare, so we use 64-bit numeric constants here.
  30. //
  31.  
  32. #define PVD_SIGNATURE 0x0001313030444301    // 0x01 "CD001" 0x01 0x00
  33. #define TVD_SIGNATURE 0x00013130304443FF    // 0xFF "CD001" 0x01 0x00
  34.  
  35. #ifdef STATIC_CRC_TABLE
  36.  
  37. const unsigned long CrcTable32[ 256 ] = {
  38.     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
  39.     0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  40.     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
  41.     0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  42.     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
  43.     0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  44.     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
  45.     0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  46.     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
  47.     0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  48.     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
  49.     0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  50.     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
  51.     0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  52.     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
  53.     0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  54.     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
  55.     0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  56.     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
  57.     0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  58.     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
  59.     0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  60.     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
  61.     0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  62.     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
  63.     0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  64.     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
  65.     0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  66.     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
  67.     0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  68.     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
  69.     0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  70.     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
  71.     0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  72.     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
  73.     0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  74.     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
  75.     0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  76.     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
  77.     0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  78.     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
  79.     0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  80.     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};
  81.  
  82. #else
  83.  
  84. unsigned long *CrcTable32 = NULL;
  85.  
  86. #endif
  87.  
  88. BOOLEAN GenerateCrcTable()
  89. {
  90. #ifndef STATIC_CRC_TABLE
  91.  
  92.     ULONG i, j, Value;
  93.  
  94.     if( !CrcTable32 )
  95.     {
  96.         CrcTable32 = ALLOCATE_NONPAGED_POOL( sizeof(ULONG)*256, BlockTypeMisc );
  97.         if( !CrcTable32 )
  98.             return FALSE;
  99.     }
  100.  
  101.     for ( i = 0; i < 256; i++ )
  102.     {
  103.         for ( Value = i, j = 8; j > 0; j-- )
  104.         {
  105.             if ( Value & 1 )
  106.             {
  107.                 Value = ( Value >> 1 ) ^ 0xEDB88320;
  108.             }
  109.             else
  110.             {
  111.                 Value >>= 1;
  112.             }
  113.         }
  114.  
  115.         CrcTable32[ i ] = Value;
  116.     }
  117.  
  118. #endif
  119.  
  120.     return TRUE;
  121. }
  122.  
  123. BOOLEAN CleanupCrcTable()
  124. {
  125. #ifndef STATIC_CRC_TABLE
  126.     if( CrcTable32 )
  127.     {
  128.         DEALLOCATE_NONPAGED_POOL( CrcTable32 );
  129.         CrcTable32 = NULL;
  130.     }
  131. #endif
  132.  
  133.     return TRUE;
  134. }
  135.  
  136. #pragma optimize( "t", on ) // following code should be fast versus small
  137. // (crc loop 40000 times per corrected image)
  138.  
  139.  
  140. ULONG
  141. __forceinline               // called from only one location
  142. Crc32(
  143.      ULONG InitialCrc,
  144.      const VOID *Buffer,
  145.      ULONG Bytes
  146.      )
  147. {
  148.  
  149.     ULONG Crc = InitialCrc;
  150.     const UCHAR *p = Buffer;
  151.     ULONG Count = Bytes;
  152.  
  153.     while ( Count-- )
  154.     {
  155.         Crc = ( Crc >> 8 ) ^ CrcTable32[ (UCHAR)Crc ^ *p++ ];
  156.     }
  157.  
  158.     return Crc;
  159. }
  160.  
  161.  
  162. ULONG
  163. __fastcall
  164. LocateTvdSectorInIsoFileHeader(
  165.                               PVOID FileHeader,       // should be at least 20 * 2048 (40,960) bytes, but
  166.                               ULONG SizeOfHeader      //  won't search past 24 * 2048 (49,152) bytes
  167.                               )
  168. {
  169.     PBYTE p;
  170.     PBYTE z;
  171.  
  172.     if ( SizeOfHeader >= ( 20 * 2048 ))
  173.     {   // big enough for ISO-9660 headers
  174.  
  175.         if ( SizeOfHeader > ( 24 * 2048 ))
  176.         {    // don't bother searching
  177.             SizeOfHeader = ( 24 * 2048 );      // beyond sector 23
  178.         }
  179.  
  180.         p = (PBYTE)FileHeader + ( 16 * 2048 );  // point at PVD sector
  181.         z = (PBYTE)FileHeader + SizeOfHeader;   // search until p >= z
  182.  
  183.         //
  184.         //  If FileHeader buffer is guaranteed to be 8-byte aligned, can remove
  185.         //  the UNALIGNED keywords below.
  186.         //
  187.  
  188.         if ( *(UNALIGNED UINT64 *)p == PVD_SIGNATURE )
  189.         {    // ISO-9660 image
  190.  
  191.             p += 2048;                          // skip PVD and scan for TVD
  192.  
  193.             do
  194.             {
  195.  
  196.                 if ( *(UNALIGNED UINT64 *)p == TVD_SIGNATURE )
  197.                 {
  198.  
  199.                     return(ULONG)( p - (PBYTE)FileHeader );   // return offset to TVD
  200.                 }
  201.  
  202.                 p += 2048;
  203.             }
  204.  
  205.             while ( p < z );
  206.  
  207.         }
  208.     }
  209.  
  210.     return 0;                               // no TVD, not valid ISO-9660 image
  211. }
  212.  
  213.  
  214. VOID
  215. __fastcall
  216. EmbedDataInIsoTvdAndCorrectCrc(
  217.                               PVOID IsoFileHeader,
  218.                               ULONG TvdSectorOffset,
  219.                               PVOID DataToEmbed,
  220.                               ULONG SizeOfData
  221.                               )
  222. {
  223.     //
  224.     //  If IsoFileHeader is 4-byte aligned, can remove UNALIGNED keyword.
  225.     //
  226.  
  227.     UNALIGNED ULONG *pCrcCorrection;
  228.  
  229.     ASSERT( SizeOfData <= 1020 );
  230.  
  231.     memcpy( (PBYTE)IsoFileHeader + TvdSectorOffset + 1024, DataToEmbed, SizeOfData );
  232.  
  233.     //
  234.     //  We only perform CRC correction if the TVD has been predisposed to
  235.     //  CRC correction (cdimage -xx).  In other words, if the last four
  236.     //  bytes of the TVD already contain a non-zero CRC correction.
  237.     //
  238.  
  239.     pCrcCorrection = (PULONG)( (PBYTE)IsoFileHeader + TvdSectorOffset + 2048 - 4 );
  240.  
  241.     if ( *pCrcCorrection )
  242.     {
  243.         *pCrcCorrection = Crc32( 0xFFFFFFFF, IsoFileHeader, TvdSectorOffset + 2048 - 4 );
  244.     }
  245. }
  246.  
  247. ULONG
  248. SrvFindCatchOffset(
  249.     IN OUT PVOID pBuffer,
  250.     IN ULONG BufferSize
  251.     )
  252. {
  253.     ULONG offset;
  254.     offset = LocateTvdSectorInIsoFileHeader( pBuffer, BufferSize );
  255.     if( offset )
  256.     {
  257.         offset += 1024;
  258.     }
  259.    
  260.     return offset;
  261. }
  262.  
  263. void
  264. SrvCorrectCatchBuffer(
  265.     IN PVOID pBuffer,
  266.     IN ULONG CatchOffset
  267.     )
  268. {
  269.     UNALIGNED ULONG *pCrcCorrection;
  270.  
  271.     CatchOffset -= 1024;
  272.  
  273.     //
  274.     //  We only perform CRC correction if the TVD has been predisposed to
  275.     //  CRC correction (cdimage -xx).  In other words, if the last four
  276.     //  bytes of the TVD already contain a non-zero CRC correction.
  277.     //
  278.  
  279.     pCrcCorrection = (PULONG)( (PBYTE)pBuffer + CatchOffset + 2048 - 4 );
  280.  
  281.     if ( *pCrcCorrection )
  282.     {
  283.         *pCrcCorrection = Crc32( 0xFFFFFFFF, pBuffer, CatchOffset + 2048 - 4 );
  284.     }
  285. }
  286.  
  287. void
  288. SrvIsMonitoredShare(
  289.     IN OUT PSHARE Share
  290.     )
  291. {
  292.     int i;
  293.     UNICODE_STRING watchShare;
  294.  
  295.     if( SrvCatchShares > 0 )
  296.     {
  297.         for( i=0; SrvCatchShareNames[i]; i++ )
  298.         {
  299.             watchShare.Buffer = SrvCatchShareNames[i];
  300.             watchShare.Length = (USHORT)STRLEN( SrvCatchShareNames[i] )*sizeof(WCHAR);
  301.             if( RtlCompareUnicodeString( &watchShare, &Share->ShareName, TRUE ) == 0 )
  302.             {
  303.                 Share->IsCatchShare = TRUE;
  304.                 break;
  305.             }
  306.         }
  307.     }
  308. }
  309.  
  310. #endif // SRVCATCH
  311.  
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