reactos/ntoskrnl/se/acl.c

   1 /* $Id: acl.c,v 1.7 2002/06/15 10:09:17 ekohl Exp $
   2  *
   3  * COPYRIGHT:         See COPYING in the top level directory
   4  * PROJECT:           ReactOS kernel
   5  * PURPOSE:           Security manager
   6  * FILE:              kernel/se/acl.c
   7  * PROGRAMER:         David Welch <welch@cwcom.net>
   8  * REVISION HISTORY:
   9  *                 26/07/98: Added stubs for security functions
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/se.h>
  16
  17 #include <internal/debug.h>
  18
  19 #define TAG_ACL    TAG('A', 'C', 'L', 'T')
  20
  21
  22 /* GLOBALS ******************************************************************/
  23
  24 PACL EXPORTED SePublicDefaultDacl = NULL;
  25 PACL EXPORTED SeSystemDefaultDacl = NULL;
  26
  27 PACL SePublicDefaultUnrestrictedDacl = NULL;
  28 PACL SePublicOpenDacl = NULL;
  29 PACL SePublicOpenUnrestrictedDacl = NULL;
  30 PACL SeUnrestrictedDacl = NULL;
  31
  32
  33 /* FUNCTIONS ****************************************************************/
  34
  35 BOOLEAN
  36 SepInitDACLs(VOID)
  37 {
  38   ULONG AclLength2;
  39   ULONG AclLength3;
  40   ULONG AclLength4;
  41
  42   AclLength2 = sizeof(ACL) +
  43                2 * (RtlLengthRequiredSid(1) + sizeof(ACE_HEADER));
  44   AclLength3 = sizeof(ACL) +
  45                3 * (RtlLengthRequiredSid(1) + sizeof(ACE_HEADER));
  46   AclLength4 = sizeof(ACL) +
  47                4 * (RtlLengthRequiredSid(1) + sizeof(ACE_HEADER));
  48
  49   /* create PublicDefaultDacl */
  50   SePublicDefaultDacl = ExAllocatePoolWithTag(NonPagedPool,
  51                                               AclLength2,
  52                                               TAG_ACL);
  53   if (SePublicDefaultDacl == NULL)
  54     return(FALSE);
  55
  56   RtlCreateAcl(SePublicDefaultDacl,
  57                AclLength2,
  58                2);
  59
  60   RtlAddAccessAllowedAce(SePublicDefaultDacl,
  61                          2,
  62                          GENERIC_EXECUTE,
  63                          SeWorldSid);
  64
  65   RtlAddAccessAllowedAce(SePublicDefaultDacl,
  66                          2,
  67                          GENERIC_ALL,
  68                          SeLocalSystemSid);
  69
  70
  71   /* create PublicDefaultUnrestrictedDacl */
  72   SePublicDefaultUnrestrictedDacl = ExAllocatePoolWithTag(NonPagedPool,
  73                                                           AclLength4,
  74                                                           TAG_ACL);
  75   if (SePublicDefaultUnrestrictedDacl == NULL)
  76     return(FALSE);
  77
  78   RtlCreateAcl(SePublicDefaultUnrestrictedDacl,
  79                AclLength4,
  80                2);
  81
  82   RtlAddAccessAllowedAce(SePublicDefaultUnrestrictedDacl,
  83                          4,
  84                          GENERIC_EXECUTE,
  85                          SeWorldSid);
  86
  87   RtlAddAccessAllowedAce(SePublicDefaultUnrestrictedDacl,
  88                          4,
  89                          GENERIC_ALL,
  90                          SeLocalSystemSid);
  91
  92   RtlAddAccessAllowedAce(SePublicDefaultUnrestrictedDacl,
  93                          4,
  94                          GENERIC_ALL,
  95                          SeAliasAdminsSid);
  96
  97   RtlAddAccessAllowedAce(SePublicDefaultUnrestrictedDacl,
  98                          4,
  99                          GENERIC_READ | GENERIC_EXECUTE | STANDARD_RIGHTS_READ,
 100                          SeRestrictedCodeSid);
 101
 102   /* create PublicOpenDacl */
 103   SePublicOpenDacl = ExAllocatePoolWithTag(NonPagedPool,
 104                                            AclLength3,
 105                                            TAG_ACL);
 106   if (SePublicOpenDacl == NULL)
 107     return(FALSE);
 108
 109   RtlCreateAcl(SePublicOpenDacl,
 110                AclLength3,
 111                3);
 112
 113   RtlAddAccessAllowedAce(SePublicOpenDacl,
 114                          2,
 115                          GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE,
 116                          SeWorldSid);
 117
 118   RtlAddAccessAllowedAce(SePublicOpenDacl,
 119                          2,
 120                          GENERIC_ALL,
 121                          SeLocalSystemSid);
 122
 123   RtlAddAccessAllowedAce(SePublicOpenDacl,
 124                          2,
 125                          GENERIC_ALL,
 126                          SeAliasAdminsSid);
 127
 128
 129   return(TRUE);
 130 }
 131
 132
 133 BOOLEAN STDCALL
 134 RtlFirstFreeAce(PACL Acl,
 135                 PACE* Ace)
 136 {
 137    PACE Current;
 138    PVOID AclEnd;
 139    ULONG i;
 140
 141    Current = (PACE)(Acl + 1);
 142    *Ace = NULL;
 143    i = 0;
 144    if (Acl->AceCount == 0)
 145      {
 146         *Ace = Current;
 147         return(TRUE);
 148      }
 149    AclEnd = Acl->AclSize + Acl;
 150    do
 151      {
 152         if ((PVOID)Current >= AclEnd)
 153           {
 154              return(FALSE);
 155           }
 156         if (Current->Header.AceType == 4)
 157           {
 158              if (Acl->AclRevision < 3)
 159                {
 160                   return(FALSE);
 161                }
 162           }
 163         Current = (PACE)((PVOID)Current + (ULONG)Current->Header.AceSize);
 164         i++;
 165      } while (i < Acl->AceCount);
 166    if ((PVOID)Current >= AclEnd)
 167      {
 168         return(FALSE);
 169      }
 170    *Ace = Current;
 171    return(TRUE);
 172 }
 173
 174
 175 NTSTATUS
 176 RtlpAddKnownAce(PACL Acl,
 177                 ULONG Revision,
 178                 ACCESS_MASK AccessMask,
 179                 PSID Sid,
 180                 ULONG Type)
 181 {
 182   PACE Ace;
 183
 184   if (!RtlValidSid(Sid))
 185     {
 186       return(STATUS_INVALID_SID);
 187     }
 188   if (Acl->AclRevision > 3 ||
 189       Revision > 3)
 190     {
 191       return(STATUS_UNKNOWN_REVISION);
 192     }
 193   if (Revision < Acl->AclRevision)
 194     {
 195       Revision = Acl->AclRevision;
 196     }
 197   if (!RtlFirstFreeAce(Acl, &Ace))
 198     {
 199       return(STATUS_BUFFER_TOO_SMALL);
 200     }
 201   if (Ace == NULL)
 202     {
 203       return(STATUS_UNSUCCESSFUL);
 204     }
 205   if (((PVOID)Ace + RtlLengthSid(Sid) + sizeof(ACE)) >=
 206       ((PVOID)Acl + Acl->AclSize))
 207     {
 208       return(STATUS_BUFFER_TOO_SMALL);
 209     }
 210   Ace->Header.AceFlags = 0;
 211   Ace->Header.AceType = Type;
 212   Ace->Header.AceSize = RtlLengthSid(Sid) + sizeof(ACE);
 213   Ace->Header.AccessMask = AccessMask;
 214   RtlCopySid(RtlLengthSid(Sid), (PSID)(Ace + 1), Sid);
 215   Acl->AceCount++;
 216   Acl->AclRevision = Revision;
 217   return(STATUS_SUCCESS);
 218 }
 219
 220
 221 NTSTATUS STDCALL
 222 RtlAddAccessAllowedAce(PACL Acl,
 223                        ULONG Revision,
 224                        ACCESS_MASK AccessMask,
 225                        PSID Sid)
 226 {
 227   return(RtlpAddKnownAce(Acl, Revision, AccessMask, Sid, 0));
 228 }
 229
 230
 231 NTSTATUS STDCALL
 232 RtlAddAce(PACL Acl,
 233           ULONG AclRevision,
 234           ULONG StartingIndex,
 235           PACE AceList,
 236           ULONG AceListLength)
 237 {
 238    PACE Ace;
 239    ULONG i;
 240    PACE Current;
 241    ULONG j;
 242
 243    if (Acl->AclRevision != 2 &&
 244        Acl->AclRevision != 3)
 245      {
 246         return(STATUS_UNSUCCESSFUL);
 247      }
 248    if (!RtlFirstFreeAce(Acl,&Ace))
 249      {
 250         return(STATUS_UNSUCCESSFUL);
 251      }
 252    if (Acl->AclRevision <= AclRevision)
 253      {
 254         AclRevision = Acl->AclRevision;
 255      }
 256    if (((PVOID)AceList + AceListLength) <= (PVOID)AceList)
 257      {
 258         return(STATUS_UNSUCCESSFUL);
 259      }
 260    i = 0;
 261    Current = (PACE)(Acl + 1);
 262    while ((PVOID)Current < ((PVOID)AceList + AceListLength))
 263      {
 264         if (AceList->Header.AceType == 4 &&
 265             AclRevision < 3)
 266           {
 267              return(STATUS_UNSUCCESSFUL);
 268           }
 269         Current = (PACE)((PVOID)Current + Current->Header.AceSize);
 270      }
 271    if (Ace == NULL)
 272      {
 273         return(STATUS_UNSUCCESSFUL);
 274      }
 275    if (((PVOID)Ace + AceListLength) >= ((PVOID)Acl + Acl->AclSize))
 276      {
 277         return(STATUS_UNSUCCESSFUL);
 278      }
 279    if (StartingIndex != 0)
 280      {
 281         if (Acl->AceCount > 0)
 282           {
 283              Current = (PACE)(Acl + 1);
 284              for (j = 0; j < StartingIndex; j++)
 285                {
 286                   Current = (PACE)((PVOID)Current + Current->Header.AceSize);
 287                }
 288           }
 289      }
 290    /* RtlpAddData(AceList, AceListLength, Current, (PVOID)Ace - Current)); */
 291    memcpy(Current, AceList, AceListLength);
 292    Acl->AceCount = Acl->AceCount + i;
 293    Acl->AclRevision = AclRevision;
 294    return(TRUE);
 295 }
 296
 297
 298 NTSTATUS STDCALL
 299 RtlCreateAcl(PACL Acl,
 300              ULONG AclSize,
 301              ULONG AclRevision)
 302 {
 303   if (AclSize < 8)
 304     {
 305       return(STATUS_BUFFER_TOO_SMALL);
 306     }
 307   if (AclRevision != 2 &&
 308       AclRevision != 3)
 309     {
 310       return(STATUS_UNKNOWN_REVISION);
 311     }
 312   if (AclSize > 0xffff)
 313     {
 314       return(STATUS_UNSUCCESSFUL);
 315     }
 316   AclSize = AclSize & ~(0x3);
 317   Acl->AclSize = AclSize;
 318   Acl->AclRevision = AclRevision;
 319   Acl->AceCount = 0;
 320   Acl->Sbz1 = 0;
 321   Acl->Sbz2 = 0;
 322   return(STATUS_SUCCESS);
 323 }
 324
 325 /* EOF */