python/samba/ms_schema.py

   1 # create schema.ldif (as a string) from WSPP documentation
   2 #
   3 # based on minschema.py and minschema_wspp
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 """Generate LDIF from WSPP documentation."""
  19
  20 import re
  21 import base64
  22 import uuid
  23
  24 bitFields = {}
  25
  26 # ADTS: 2.2.9
  27 # bit positions as labeled in the docs
  28 bitFields["searchflags"] = {
  29     'fATTINDEX': 31,         # IX
  30     'fPDNTATTINDEX': 30,     # PI
  31     'fANR': 29,  # AR
  32     'fPRESERVEONDELETE': 28,         # PR
  33     'fCOPY': 27,     # CP
  34     'fTUPLEINDEX': 26,       # TP
  35     'fSUBTREEATTINDEX': 25,  # ST
  36     'fCONFIDENTIAL': 24,     # CF
  37     'fCONFIDENTAIL': 24,  # typo
  38     'fNEVERVALUEAUDIT': 23,  # NV
  39     'fRODCAttribute': 22,    # RO
  40
  41
  42     # missing in ADTS but required by LDIF
  43     'fRODCFilteredAttribute': 22,    # RO
  44     'fRODCFILTEREDATTRIBUTE': 22,  # case
  45     'fEXTENDEDLINKTRACKING': 21,  # XL
  46     'fBASEONLY': 20,  # BO
  47     'fPARTITIONSECRET': 19,  # SE
  48 }
  49
  50 # ADTS: 2.2.10
  51 bitFields["systemflags"] = {
  52     'FLAG_ATTR_NOT_REPLICATED': 31, 'FLAG_CR_NTDS_NC': 31,     # NR
  53     'FLAG_ATTR_REQ_PARTIAL_SET_MEMBER': 30, 'FLAG_CR_NTDS_DOMAIN': 30,     # PS
  54     'FLAG_ATTR_IS_CONSTRUCTED': 29, 'FLAG_CR_NTDS_NOT_GC_REPLICATED': 29,     # CS
  55     'FLAG_ATTR_IS_OPERATIONAL': 28,     # OP
  56     'FLAG_SCHEMA_BASE_OBJECT': 27,     # BS
  57     'FLAG_ATTR_IS_RDN': 26,     # RD
  58     'FLAG_DISALLOW_MOVE_ON_DELETE': 6,     # DE
  59     'FLAG_DOMAIN_DISALLOW_MOVE': 5,     # DM
  60     'FLAG_DOMAIN_DISALLOW_RENAME': 4,     # DR
  61     'FLAG_CONFIG_ALLOW_LIMITED_MOVE': 3,     # AL
  62     'FLAG_CONFIG_ALLOW_MOVE': 2,     # AM
  63     'FLAG_CONFIG_ALLOW_RENAME': 1,     # AR
  64     'FLAG_DISALLOW_DELETE': 0     # DD
  65 }
  66
  67 # ADTS: 2.2.11
  68 bitFields["schemaflagsex"] = {
  69     'FLAG_ATTR_IS_CRITICAL': 31
  70 }
  71
  72 # ADTS: 3.1.1.2.2.2
  73 oMObjectClassBER = {
  74     '1.3.12.2.1011.28.0.702': base64.b64encode(b'\x2B\x0C\x02\x87\x73\x1C\x00\x85\x3E').decode('utf8'),
  75     '1.2.840.113556.1.1.1.12': base64.b64encode(b'\x2A\x86\x48\x86\xF7\x14\x01\x01\x01\x0C').decode('utf8'),
  76     '2.6.6.1.2.5.11.29': base64.b64encode(b'\x56\x06\x01\x02\x05\x0B\x1D').decode('utf8'),
  77     '1.2.840.113556.1.1.1.11': base64.b64encode(b'\x2A\x86\x48\x86\xF7\x14\x01\x01\x01\x0B').decode('utf8'),
  78     '1.3.12.2.1011.28.0.714': base64.b64encode(b'\x2B\x0C\x02\x87\x73\x1C\x00\x85\x4A').decode('utf8'),
  79     '1.3.12.2.1011.28.0.732': base64.b64encode(b'\x2B\x0C\x02\x87\x73\x1C\x00\x85\x5C').decode('utf8'),
  80     '1.2.840.113556.1.1.1.6': base64.b64encode(b'\x2A\x86\x48\x86\xF7\x14\x01\x01\x01\x06').decode('utf8')
  81 }
  82
  83 # separated by commas in docs, and must be broken up
  84 multivalued_attrs = set(["auxiliaryclass", "maycontain", "mustcontain", "posssuperiors",
  85                          "systemauxiliaryclass", "systemmaycontain", "systemmustcontain",
  86                          "systemposssuperiors"])
  87
  88
  89 def __read_folded_line(f, buffer):
  90     """ reads a line from an LDIF file, unfolding it"""
  91     line = buffer
  92
  93     while True:
  94         l = f.readline()
  95
  96         if l[:1] == " ":
  97             # continued line
  98
  99             # cannot fold an empty line
 100             assert(line != "" and line != "\n")
 101
 102             # preserves '\n '
 103             line = line + l
 104         else:
 105             # non-continued line
 106             if line == "":
 107                 line = l
 108
 109                 if l == "":
 110                     # eof, definitely won't be folded
 111                     break
 112             else:
 113                 # marks end of a folded line
 114                 # line contains the now unfolded line
 115                 # buffer contains the start of the next possibly folded line
 116                 buffer = l
 117                 break
 118
 119     return (line, buffer)
 120
 121
 122 def __read_raw_entries(f):
 123     """reads an LDIF entry, only unfolding lines"""
 124     import sys
 125
 126     # will not match options after the attribute type
 127     attr_type_re = re.compile("^([A-Za-z]+[A-Za-z0-9-]*):")
 128
 129     buffer = ""
 130
 131     while True:
 132         entry = []
 133
 134         while True:
 135             (l, buffer) = __read_folded_line(f, buffer)
 136
 137             if l[:1] == "#":
 138                 continue
 139
 140             if l == "\n" or l == "":
 141                 break
 142
 143             m = attr_type_re.match(l)
 144
 145             if m:
 146                 if l[-1:] == "\n":
 147                     l = l[:-1]
 148
 149                 entry.append(l)
 150             else:
 151                 print("Invalid line: %s" % l, end=' ', file=sys.stderr)
 152                 sys.exit(1)
 153
 154         if len(entry):
 155             yield entry
 156
 157         if l == "":
 158             break
 159
 160
 161 def fix_dn(dn):
 162     """fix a string DN to use ${SCHEMADN}"""
 163
 164     # folding?
 165     if dn.find("<RootDomainDN>") != -1:
 166         dn = dn.replace("\n ", "")
 167         dn = dn.replace(" ", "")
 168         return dn.replace("CN=Schema,CN=Configuration,<RootDomainDN>", "${SCHEMADN}")
 169     elif dn.endswith("DC=X"):
 170         return dn.replace("CN=Schema,CN=Configuration,DC=X", "${SCHEMADN}")
 171     elif dn.endswith("CN=X"):
 172         return dn.replace("CN=Schema,CN=Configuration,CN=X", "${SCHEMADN}")
 173     else:
 174         return dn
 175
 176
 177 def __convert_bitfield(key, value):
 178     """Evaluate the OR expression in 'value'"""
 179     assert(isinstance(value, str))
 180
 181     value = value.replace("\n ", "")
 182     value = value.replace(" ", "")
 183
 184     try:
 185         # some attributes already have numeric values
 186         o = int(value)
 187     except ValueError:
 188         o = 0
 189         flags = value.split("|")
 190         for f in flags:
 191             bitpos = bitFields[key][f]
 192             o = o | (1 << (31 - bitpos))
 193
 194     return str(o)
 195
 196
 197 def __write_ldif_one(entry):
 198     """Write out entry as LDIF"""
 199     out = []
 200
 201     for l in entry:
 202         if isinstance(l[1], str):
 203             vl = [l[1]]
 204         else:
 205             vl = l[1]
 206
 207         if l[2]:
 208             out.append("%s:: %s" % (l[0], l[1]))
 209             continue
 210
 211         for v in vl:
 212             out.append("%s: %s" % (l[0], v))
 213
 214     return "\n".join(out)
 215
 216
 217 def __transform_entry(entry, objectClass):
 218     """Perform transformations required to convert the LDIF-like schema
 219        file entries to LDIF, including Samba-specific stuff."""
 220
 221     entry = [l.split(":", 1) for l in entry]
 222
 223     cn = ""
 224     skip_dn = skip_objectclass = skip_admin_description = skip_admin_display_name = False
 225
 226     for l in entry:
 227         if l[1].startswith(': '):
 228             l.append(True)
 229             l[1] = l[1][2:]
 230         else:
 231             l.append(False)
 232
 233         key = l[0].lower()
 234         l[1] = l[1].lstrip()
 235         l[1] = l[1].rstrip()
 236
 237         if not cn and key == "cn":
 238             cn = l[1]
 239
 240         if key in multivalued_attrs:
 241             # unlike LDIF, these are comma-separated
 242             l[1] = l[1].replace("\n ", "")
 243             l[1] = l[1].replace(" ", "")
 244
 245             l[1] = l[1].split(",")
 246
 247         if key in bitFields:
 248             l[1] = __convert_bitfield(key, l[1])
 249
 250         if key == "omobjectclass":
 251             if not l[2]:
 252                 l[1] = oMObjectClassBER[l[1].strip()]
 253                 l[2] = True
 254
 255         if isinstance(l[1], str):
 256             l[1] = fix_dn(l[1])
 257
 258         if key == 'dn':
 259             skip_dn = True
 260             dn = l[1]
 261
 262         if key == 'objectclass':
 263             skip_objectclass = True
 264         elif key == 'admindisplayname':
 265             skip_admin_display_name = True
 266         elif key == 'admindescription':
 267             skip_admin_description = True
 268
 269     assert(cn)
 270
 271     header = []
 272     if not skip_dn:
 273         header.append(["dn", "CN=%s,${SCHEMADN}" % cn, False])
 274     else:
 275         header.append(["dn", dn, False])
 276
 277     if not skip_objectclass:
 278         header.append(["objectClass", ["top", objectClass], False])
 279     if not skip_admin_description:
 280         header.append(["adminDescription", cn, False])
 281     if not skip_admin_display_name:
 282         header.append(["adminDisplayName", cn, False])
 283
 284     header.append(["objectGUID", str(uuid.uuid4()), False])
 285
 286     entry = header + [x for x in entry if x[0].lower() not in set(['dn', 'changetype', 'objectcategory'])]
 287
 288     return entry
 289
 290
 291 def __parse_schema_file(filename, objectClass):
 292     """Load and transform a schema file."""
 293
 294     out = []
 295
 296     from io import open
 297     with open(filename, "r", encoding='latin-1') as f:
 298         for entry in __read_raw_entries(f):
 299             out.append(__write_ldif_one(__transform_entry(entry, objectClass)))
 300
 301     return "\n\n".join(out)
 302
 303
 304 def read_ms_schema(attr_file, classes_file, dump_attributes=True, dump_classes=True, debug=False):
 305     """Read WSPP documentation-derived schema files."""
 306
 307     attr_ldif = ""
 308     classes_ldif = ""
 309
 310     if dump_attributes:
 311         attr_ldif = __parse_schema_file(attr_file, "attributeSchema")
 312     if dump_classes:
 313         classes_ldif = __parse_schema_file(classes_file, "classSchema")
 314
 315     return attr_ldif + "\n\n" + classes_ldif + "\n\n"
 316
 317
 318 if __name__ == '__main__':
 319     import sys
 320
 321     try:
 322         attr_file = sys.argv[1]
 323         classes_file = sys.argv[2]
 324     except IndexError:
 325         print("Usage: %s attr-file.txt classes-file.txt" % (sys.argv[0]), file=sys.stderr)
 326         sys.exit(1)
 327
 328     print(read_ms_schema(attr_file, classes_file))