mcs/class/corlib/System.Security.AccessControl/RawAcl.cs

   1 //
   2 // System.Security.AccessControl.RawAcl implementation
   3 //
   4 // Authors:
   5 //      Dick Porter  <dick@ximian.com>
   6 //      Atsushi Enomoto  <atsushi@ximian.com>
   7 //      Kenneth Bell
   8 //
   9 // Copyright (C) 2006-2007 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections.Generic;
  32 using System.Text;
  33
  34 namespace System.Security.AccessControl {
  35         public sealed class RawAcl : GenericAcl
  36         {
  37                 private byte revision;
  38                 private List<GenericAce> list;
  39
  40                 public RawAcl (byte revision, int capacity)
  41                 {
  42                         this.revision = revision;
  43                         list = new List<GenericAce> (capacity);
  44                 }
  45
  46                 public RawAcl (byte [] binaryForm, int offset)
  47                 {
  48                         if (binaryForm == null)
  49                                 throw new ArgumentNullException("binaryForm");
  50
  51                         if (offset < 0 || offset > binaryForm.Length - 8)
  52                                 throw new ArgumentOutOfRangeException("offset", offset, "Offset out of range");
  53
  54                         revision = binaryForm[offset];
  55                         if (revision != AclRevision && revision != AclRevisionDS)
  56                                 throw new ArgumentException("Invalid ACL - unknown revision", "binaryForm");
  57
  58                         int binaryLength = ReadUShort(binaryForm, offset + 2);
  59                         if (offset > binaryForm.Length - binaryLength)
  60                                 throw new ArgumentException("Invalid ACL - truncated", "binaryForm");
  61
  62                         int pos = offset + 8;
  63                         int numAces = ReadUShort(binaryForm, offset + 4);
  64                         list = new List<GenericAce>(numAces);
  65                         for (int i = 0; i < numAces; ++i) {
  66                                 GenericAce newAce = GenericAce.CreateFromBinaryForm(binaryForm, pos);
  67                                 list.Add(newAce);
  68                                 pos += newAce.BinaryLength;
  69                         }
  70                 }
  71
  72                 internal RawAcl(byte revision, List<GenericAce> aces)
  73                 {
  74                         this.revision = revision;
  75                         this.list = aces;
  76                 }
  77
  78                 public override int BinaryLength
  79                 {
  80                         get {
  81                                 int len = 8;
  82                                 foreach(var ace in list)
  83                                 {
  84                                         len += ace.BinaryLength;
  85                                 }
  86                                 return len;
  87                         }
  88                 }
  89
  90                 public override int Count {
  91                         get { return list.Count; }
  92                 }
  93
  94                 public override GenericAce this [int index]
  95                 {
  96                         get { return list [index]; }
  97                         set { list [index] = value; }
  98                 }
  99
 100                 public override byte Revision {
 101                         get { return revision; }
 102                 }
 103
 104                 public override void GetBinaryForm (byte[] binaryForm,
 105                                                     int offset)
 106                 {
 107                         if(binaryForm == null)
 108                                 throw new ArgumentNullException("binaryForm");
 109
 110                         if(offset < 0
 111                            || offset > binaryForm.Length - BinaryLength)
 112                                 throw new ArgumentException("Offset out of range", "offset");
 113
 114                         binaryForm[offset] = Revision;
 115                         binaryForm[offset + 1] = 0;
 116                         WriteUShort((ushort)BinaryLength, binaryForm,
 117                                     offset + 2);
 118                         WriteUShort((ushort)list.Count, binaryForm,
 119                                     offset + 4);
 120                         WriteUShort(0, binaryForm, offset + 6);
 121
 122                         int pos = offset + 8;
 123                         foreach(var ace in list)
 124                         {
 125                                 ace.GetBinaryForm(binaryForm, pos);
 126                                 pos += ace.BinaryLength;
 127                         }
 128                 }
 129
 130                 public void InsertAce (int index, GenericAce ace)
 131                 {
 132                         if (ace == null)
 133                                 throw new ArgumentNullException ("ace");
 134                         list.Insert (index, ace);
 135                 }
 136
 137                 public void RemoveAce (int index)
 138                 {
 139                         list.RemoveAt (index);
 140                 }
 141
 142                 internal override string GetSddlForm(ControlFlags sdFlags,
 143                                                      bool isDacl)
 144                 {
 145                         StringBuilder result = new StringBuilder();
 146
 147                         if(isDacl) {
 148                                 if((sdFlags & ControlFlags.DiscretionaryAclProtected) != 0)
 149                                         result.Append("P");
 150                                 if((sdFlags & ControlFlags.DiscretionaryAclAutoInheritRequired) != 0)
 151                                         result.Append("AR");
 152                                 if((sdFlags & ControlFlags.DiscretionaryAclAutoInherited) != 0)
 153                                         result.Append("AI");
 154                         } else {
 155                                 if((sdFlags & ControlFlags.SystemAclProtected) != 0)
 156                                         result.Append("P");
 157                                 if((sdFlags & ControlFlags.SystemAclAutoInheritRequired) != 0)
 158                                         result.Append("AR");
 159                                 if((sdFlags & ControlFlags.SystemAclAutoInherited) != 0)
 160                                         result.Append("AI");
 161                         }
 162
 163                         foreach(var ace in list)
 164                         {
 165                                 result.Append(ace.GetSddlForm());
 166                         }
 167
 168                         return result.ToString();
 169                 }
 170
 171                 internal static RawAcl ParseSddlForm(string sddlForm,
 172                                                      bool isDacl,
 173                                                      ref ControlFlags sdFlags,
 174                                                      ref int pos)
 175                 {
 176                         ParseFlags(sddlForm, isDacl, ref sdFlags, ref pos);
 177
 178                         byte revision = GenericAcl.AclRevision;
 179                         List<GenericAce> aces = new List<GenericAce>();
 180                         while(pos < sddlForm.Length && sddlForm[pos] == '(') {
 181                                 GenericAce ace = GenericAce.CreateFromSddlForm(
 182                                                         sddlForm, ref pos);
 183                                 if ((ace as ObjectAce) != null)
 184                                         revision = GenericAcl.AclRevisionDS;
 185                                 aces.Add(ace);
 186                         }
 187
 188
 189                         return new RawAcl(revision, aces);
 190                 }
 191
 192                 private static void ParseFlags(string sddlForm,
 193                                                bool isDacl,
 194                                                ref ControlFlags sdFlags,
 195                                                ref int pos)
 196                 {
 197                         char ch = Char.ToUpperInvariant(sddlForm[pos]);
 198                         while(ch == 'P' || ch == 'A') {
 199                                 if(ch == 'P') {
 200                                         if (isDacl)
 201                                                 sdFlags |= ControlFlags.DiscretionaryAclProtected;
 202                                         else
 203                                                 sdFlags |= ControlFlags.SystemAclProtected;
 204                                         pos++;
 205                                 } else if(sddlForm.Length > pos + 1) {
 206                                         ch = Char.ToUpperInvariant(sddlForm[pos + 1]);
 207                                         if(ch == 'R') {
 208                                                 if (isDacl)
 209                                                         sdFlags |= ControlFlags.DiscretionaryAclAutoInheritRequired;
 210                                                 else
 211                                                         sdFlags |= ControlFlags.SystemAclAutoInheritRequired;
 212                                                 pos += 2;
 213                                         } else if (ch == 'I') {
 214                                                 if (isDacl)
 215                                                         sdFlags |= ControlFlags.DiscretionaryAclAutoInherited;
 216                                                 else
 217                                                         sdFlags |= ControlFlags.SystemAclAutoInherited;
 218                                                 pos += 2;
 219                                         } else {
 220                                                 throw new ArgumentException("Invalid SDDL string.", "sddlForm");
 221                                         }
 222                                 } else {
 223                                         throw new ArgumentException("Invalid SDDL string.", "sddlForm");
 224                                 }
 225
 226                                 ch = Char.ToUpperInvariant(sddlForm[pos]);
 227                         }
 228
 229                 }
 230
 231                 private void WriteUShort (ushort val, byte[] buffer, int offset)
 232                 {
 233                         buffer[offset] = (byte)val;
 234                         buffer[offset + 1] = (byte)(val >> 8);
 235                 }
 236
 237                 private ushort ReadUShort (byte[] buffer, int offset)
 238                 {
 239                         return (ushort)((((int)buffer[offset + 0]) << 0)
 240                                         | (((int)buffer[offset + 1]) << 8));
 241                 }
 242         }
 243 }
 244