dlls/imagehlp/integrity.c

   1 /*
   2  *      IMAGEHLP library
   3  *
   4  *      Copyright 1998  Patrik Stridvall
   5  *      Copyright 2003  Mike McCormack
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "winerror.h"
  27 #include "winternl.h"
  28 #include "winnt.h"
  29 #include "imagehlp.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(imagehlp);
  33
  34 /*
  35  * These functions are partially documented at:
  36  *   http://www.cs.auckland.ac.nz/~pgut001/pubs/authenticode.txt
  37  */
  38
  39 /***********************************************************************
  40  * IMAGEHLP_GetSecurityDirOffset (INTERNAL)
  41  *
  42  * Read a file's PE header, and return the offset and size of the
  43  *  security directory.
  44  */
  45 static BOOL IMAGEHLP_GetSecurityDirOffset( HANDLE handle,
  46                                            DWORD *pdwOfs, DWORD *pdwSize )
  47 {
  48     IMAGE_DOS_HEADER dos_hdr;
  49     IMAGE_NT_HEADERS nt_hdr;
  50     DWORD count;
  51     BOOL r;
  52     IMAGE_DATA_DIRECTORY *sd;
  53
  54     TRACE("handle %p\n", handle );
  55
  56     /* read the DOS header */
  57     count = SetFilePointer( handle, 0, NULL, FILE_BEGIN );
  58     if( count == INVALID_SET_FILE_POINTER )
  59         return FALSE;
  60     count = 0;
  61     r = ReadFile( handle, &dos_hdr, sizeof dos_hdr, &count, NULL );
  62     if( !r )
  63         return FALSE;
  64     if( count != sizeof dos_hdr )
  65         return FALSE;
  66
  67     /* read the PE header */
  68     count = SetFilePointer( handle, dos_hdr.e_lfanew, NULL, FILE_BEGIN );
  69     if( count == INVALID_SET_FILE_POINTER )
  70         return FALSE;
  71     count = 0;
  72     r = ReadFile( handle, &nt_hdr, sizeof nt_hdr, &count, NULL );
  73     if( !r )
  74         return FALSE;
  75     if( count != sizeof nt_hdr )
  76         return FALSE;
  77
  78     sd = &nt_hdr.OptionalHeader.
  79                     DataDirectory[IMAGE_FILE_SECURITY_DIRECTORY];
  80
  81     TRACE("size = %x addr = %x\n", sd->Size, sd->VirtualAddress);
  82     *pdwSize = sd->Size;
  83     *pdwOfs = sd->VirtualAddress;
  84
  85     return TRUE;
  86 }
  87
  88 /***********************************************************************
  89  * IMAGEHLP_GetCertificateOffset (INTERNAL)
  90  *
  91  * Read a file's PE header, and return the offset and size of the
  92  *  security directory.
  93  */
  94 static BOOL IMAGEHLP_GetCertificateOffset( HANDLE handle, DWORD num,
  95                                            DWORD *pdwOfs, DWORD *pdwSize )
  96 {
  97     DWORD size, count, offset, len, sd_VirtualAddr;
  98     BOOL r;
  99
 100     r = IMAGEHLP_GetSecurityDirOffset( handle, &sd_VirtualAddr, &size );
 101     if( !r )
 102         return FALSE;
 103
 104     offset = 0;
 105     /* take the n'th certificate */
 106     while( 1 )
 107     {
 108         /* read the length of the current certificate */
 109         count = SetFilePointer( handle, sd_VirtualAddr + offset,
 110                                  NULL, FILE_BEGIN );
 111         if( count == INVALID_SET_FILE_POINTER )
 112             return FALSE;
 113         r = ReadFile( handle, &len, sizeof len, &count, NULL );
 114         if( !r )
 115             return FALSE;
 116         if( count != sizeof len )
 117             return FALSE;
 118
 119         /* check the certificate is not too big or too small */
 120         if( len < sizeof len )
 121             return FALSE;
 122         if( len > (size-offset) )
 123             return FALSE;
 124         if( !num-- )
 125             break;
 126
 127         /* calculate the offset of the next certificate */
 128         offset += len;
 129         if( offset >= size )
 130             return FALSE;
 131     }
 132
 133     *pdwOfs = sd_VirtualAddr + offset;
 134     *pdwSize = len;
 135
 136     TRACE("len = %x addr = %x\n", len, sd_VirtualAddr + offset);
 137
 138     return TRUE;
 139 }
 140
 141
 142 /***********************************************************************
 143  *              ImageAddCertificate (IMAGEHLP.@)
 144  */
 145
 146 BOOL WINAPI ImageAddCertificate(
 147   HANDLE FileHandle, LPWIN_CERTIFICATE Certificate, PDWORD Index)
 148 {
 149   FIXME("(%p, %p, %p): stub\n",
 150     FileHandle, Certificate, Index
 151   );
 152   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
 153   return FALSE;
 154 }
 155
 156 /***********************************************************************
 157  *              ImageEnumerateCertificates (IMAGEHLP.@)
 158  */
 159 BOOL WINAPI ImageEnumerateCertificates(
 160     HANDLE handle, WORD TypeFilter, PDWORD CertificateCount,
 161     PDWORD Indices, DWORD IndexCount)
 162 {
 163     DWORD size, count, offset, sd_VirtualAddr, index;
 164     WIN_CERTIFICATE hdr;
 165     const size_t cert_hdr_size = sizeof hdr - sizeof hdr.bCertificate;
 166     BOOL r;
 167
 168     TRACE("%p %hd %p %p %d\n",
 169            handle, TypeFilter, CertificateCount, Indices, IndexCount);
 170
 171     r = IMAGEHLP_GetSecurityDirOffset( handle, &sd_VirtualAddr, &size );
 172     if( !r )
 173         return FALSE;
 174
 175     offset = 0;
 176     index = 0;
 177     *CertificateCount = 0;
 178     while( offset < size )
 179     {
 180         /* read the length of the current certificate */
 181         count = SetFilePointer( handle, sd_VirtualAddr + offset,
 182                                  NULL, FILE_BEGIN );
 183         if( count == INVALID_SET_FILE_POINTER )
 184             return FALSE;
 185         r = ReadFile( handle, &hdr, cert_hdr_size, &count, NULL );
 186         if( !r )
 187             return FALSE;
 188         if( count != cert_hdr_size )
 189             return FALSE;
 190
 191         TRACE("Size = %08x  id = %08hx\n",
 192                hdr.dwLength, hdr.wCertificateType );
 193
 194         /* check the certificate is not too big or too small */
 195         if( hdr.dwLength < cert_hdr_size )
 196             return FALSE;
 197         if( hdr.dwLength > (size-offset) )
 198             return FALSE;
 199
 200         if( (TypeFilter == CERT_SECTION_TYPE_ANY) ||
 201             (TypeFilter == hdr.wCertificateType) )
 202         {
 203             (*CertificateCount)++;
 204             if(Indices && *CertificateCount <= IndexCount)
 205                 *Indices++ = index;
 206         }
 207
 208         /* next certificate */
 209         offset += hdr.dwLength;
 210         index++;
 211     }
 212
 213     return TRUE;
 214 }
 215
 216 /***********************************************************************
 217  *              ImageGetCertificateData (IMAGEHLP.@)
 218  *
 219  *  FIXME: not sure that I'm dealing with the Index the right way
 220  */
 221 BOOL WINAPI ImageGetCertificateData(
 222                 HANDLE handle, DWORD Index,
 223                 LPWIN_CERTIFICATE Certificate, PDWORD RequiredLength)
 224 {
 225     DWORD r, offset, ofs, size, count;
 226
 227     TRACE("%p %d %p %p\n", handle, Index, Certificate, RequiredLength);
 228
 229     if( !IMAGEHLP_GetCertificateOffset( handle, Index, &ofs, &size ) )
 230         return FALSE;
 231
 232     if( !Certificate )
 233     {
 234         *RequiredLength = size;
 235         return TRUE;
 236     }
 237
 238     if( *RequiredLength < size )
 239     {
 240         *RequiredLength = size;
 241         SetLastError( ERROR_INSUFFICIENT_BUFFER );
 242         return FALSE;
 243     }
 244
 245     *RequiredLength = size;
 246
 247     offset = SetFilePointer( handle, ofs, NULL, FILE_BEGIN );
 248     if( offset == INVALID_SET_FILE_POINTER )
 249         return FALSE;
 250
 251     r = ReadFile( handle, Certificate, size, &count, NULL );
 252     if( !r )
 253         return FALSE;
 254     if( count != size )
 255         return FALSE;
 256
 257     TRACE("OK\n");
 258
 259     return TRUE;
 260 }
 261
 262 /***********************************************************************
 263  *              ImageGetCertificateHeader (IMAGEHLP.@)
 264  */
 265 BOOL WINAPI ImageGetCertificateHeader(
 266     HANDLE handle, DWORD index, LPWIN_CERTIFICATE pCert)
 267 {
 268     DWORD r, offset, ofs, size, count;
 269     const size_t cert_hdr_size = sizeof *pCert - sizeof pCert->bCertificate;
 270
 271     TRACE("%p %d %p\n", handle, index, pCert);
 272
 273     if( !IMAGEHLP_GetCertificateOffset( handle, index, &ofs, &size ) )
 274         return FALSE;
 275
 276     if( size < cert_hdr_size )
 277         return FALSE;
 278
 279     offset = SetFilePointer( handle, ofs, NULL, FILE_BEGIN );
 280     if( offset == INVALID_SET_FILE_POINTER )
 281         return FALSE;
 282
 283     r = ReadFile( handle, pCert, cert_hdr_size, &count, NULL );
 284     if( !r )
 285         return FALSE;
 286     if( count != cert_hdr_size )
 287         return FALSE;
 288
 289     TRACE("OK\n");
 290
 291     return TRUE;
 292 }
 293
 294 /***********************************************************************
 295  *              ImageGetDigestStream (IMAGEHLP.@)
 296  */
 297 BOOL WINAPI ImageGetDigestStream(
 298   HANDLE FileHandle, DWORD DigestLevel,
 299   DIGEST_FUNCTION DigestFunction, DIGEST_HANDLE DigestHandle)
 300 {
 301   FIXME("(%p, %d, %p, %p): stub\n",
 302     FileHandle, DigestLevel, DigestFunction, DigestHandle
 303   );
 304   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
 305   return FALSE;
 306 }
 307
 308 /***********************************************************************
 309  *              ImageRemoveCertificate (IMAGEHLP.@)
 310  */
 311 BOOL WINAPI ImageRemoveCertificate(HANDLE FileHandle, DWORD Index)
 312 {
 313   FIXME("(%p, %d): stub\n", FileHandle, Index);
 314   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
 315   return FALSE;
 316 }