1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ldap
import (
"errors"
"fmt"
"github.com/vanackere/asn1-ber"
)
const (
FilterAnd = 0
FilterOr = 1
FilterNot = 2
FilterEqualityMatch = 3
FilterSubstrings = 4
FilterGreaterOrEqual = 5
FilterLessOrEqual = 6
FilterPresent = 7
FilterApproxMatch = 8
FilterExtensibleMatch = 9
)
var FilterMap = map[uint64]string{
FilterAnd: "And",
FilterOr: "Or",
FilterNot: "Not",
FilterEqualityMatch: "Equality Match",
FilterSubstrings: "Substrings",
FilterGreaterOrEqual: "Greater Or Equal",
FilterLessOrEqual: "Less Or Equal",
FilterPresent: "Present",
FilterApproxMatch: "Approx Match",
FilterExtensibleMatch: "Extensible Match",
}
const (
FilterSubstringsInitial = 0
FilterSubstringsAny = 1
FilterSubstringsFinal = 2
)
var FilterSubstringsMap = map[uint64]string{
FilterSubstringsInitial: "Substrings Initial",
FilterSubstringsAny: "Substrings Any",
FilterSubstringsFinal: "Substrings Final",
}
func CompileFilter(filter string) (*ber.Packet, error) {
if len(filter) == 0 || filter[0] != '(' {
return nil, NewError(ErrorFilterCompile, errors.New("ldap: filter does not start with an '('"))
}
packet, pos, err := compileFilter(filter, 1)
if err != nil {
return nil, err
}
if pos != len(filter) {
return nil, NewError(ErrorFilterCompile, errors.New("ldap: finished compiling filter with extra at end: "+fmt.Sprint(filter[pos:])))
}
return packet, nil
}
func DecompileFilter(packet *ber.Packet) (ret string, err error) {
defer func() {
if r := recover(); r != nil {
err = NewError(ErrorFilterDecompile, errors.New("ldap: error decompiling filter"))
}
}()
ret = "("
err = nil
childStr := ""
switch packet.Tag {
case FilterAnd:
ret += "&"
for _, child := range packet.Children {
childStr, err = DecompileFilter(child)
if err != nil {
return
}
ret += childStr
}
case FilterOr:
ret += "|"
for _, child := range packet.Children {
childStr, err = DecompileFilter(child)
if err != nil {
return
}
ret += childStr
}
case FilterNot:
ret += "!"
childStr, err = DecompileFilter(packet.Children[0])
if err != nil {
return
}
ret += childStr
case FilterSubstrings:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "="
switch packet.Children[1].Children[0].Tag {
case FilterSubstringsInitial:
ret += ber.DecodeString(packet.Children[1].Children[0].Data.Bytes()) + "*"
case FilterSubstringsAny:
ret += "*" + ber.DecodeString(packet.Children[1].Children[0].Data.Bytes()) + "*"
case FilterSubstringsFinal:
ret += "*" + ber.DecodeString(packet.Children[1].Children[0].Data.Bytes())
}
case FilterEqualityMatch:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterGreaterOrEqual:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += ">="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterLessOrEqual:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "<="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterPresent:
ret += ber.DecodeString(packet.Data.Bytes())
ret += "=*"
case FilterApproxMatch:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "~="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
}
ret += ")"
return
}
func compileFilterSet(filter string, pos int, parent *ber.Packet) (int, error) {
for pos < len(filter) && filter[pos] == '(' {
child, newPos, err := compileFilter(filter, pos+1)
if err != nil {
return pos, err
}
pos = newPos
parent.AppendChild(child)
}
if pos == len(filter) {
return pos, NewError(ErrorFilterCompile, errors.New("ldap: unexpected end of filter"))
}
return pos + 1, nil
}
func compileFilter(filter string, pos int) (*ber.Packet, int, error) {
var packet *ber.Packet
var err error
defer func() {
if r := recover(); r != nil {
err = NewError(ErrorFilterCompile, errors.New("ldap: error compiling filter"))
}
}()
newPos := pos
switch filter[pos] {
case '(':
packet, newPos, err = compileFilter(filter, pos+1)
newPos++
return packet, newPos, err
case '&':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterAnd, nil, FilterMap[FilterAnd])
newPos, err = compileFilterSet(filter, pos+1, packet)
return packet, newPos, err
case '|':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterOr, nil, FilterMap[FilterOr])
newPos, err = compileFilterSet(filter, pos+1, packet)
return packet, newPos, err
case '!':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterNot, nil, FilterMap[FilterNot])
var child *ber.Packet
child, newPos, err = compileFilter(filter, pos+1)
packet.AppendChild(child)
return packet, newPos, err
default:
attribute := ""
condition := ""
for newPos < len(filter) && filter[newPos] != ')' {
switch {
case packet != nil:
condition += fmt.Sprintf("%c", filter[newPos])
case filter[newPos] == '=':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterEqualityMatch, nil, FilterMap[FilterEqualityMatch])
case filter[newPos] == '>' && filter[newPos+1] == '=':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterGreaterOrEqual, nil, FilterMap[FilterGreaterOrEqual])
newPos++
case filter[newPos] == '<' && filter[newPos+1] == '=':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterLessOrEqual, nil, FilterMap[FilterLessOrEqual])
newPos++
case filter[newPos] == '~' && filter[newPos+1] == '=':
packet = ber.Encode(ber.ClassContext, ber.TypeConstructed, FilterApproxMatch, nil, FilterMap[FilterLessOrEqual])
newPos++
case packet == nil:
attribute += fmt.Sprintf("%c", filter[newPos])
}
newPos++
}
if newPos == len(filter) {
err = NewError(ErrorFilterCompile, errors.New("ldap: unexpected end of filter"))
return packet, newPos, err
}
if packet == nil {
err = NewError(ErrorFilterCompile, errors.New("ldap: error parsing filter"))
return packet, newPos, err
}
// Handle FilterEqualityMatch as a separate case (is primitive, not constructed like the other filters)
if packet.Tag == FilterEqualityMatch && condition == "*" {
packet.TagType = ber.TypePrimitive
packet.Tag = FilterPresent
packet.Description = FilterMap[uint64(packet.Tag)]
packet.Data.WriteString(attribute)
return packet, newPos + 1, nil
}
packet.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, attribute, "Attribute"))
switch {
case packet.Tag == FilterEqualityMatch && condition[0] == '*' && condition[len(condition)-1] == '*':
// Any
packet.Tag = FilterSubstrings
packet.Description = FilterMap[uint64(packet.Tag)]
seq := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "Substrings")
seq.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, FilterSubstringsAny, condition[1:len(condition)-1], "Any Substring"))
packet.AppendChild(seq)
case packet.Tag == FilterEqualityMatch && condition[0] == '*':
// Final
packet.Tag = FilterSubstrings
packet.Description = FilterMap[uint64(packet.Tag)]
seq := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "Substrings")
seq.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, FilterSubstringsFinal, condition[1:], "Final Substring"))
packet.AppendChild(seq)
case packet.Tag == FilterEqualityMatch && condition[len(condition)-1] == '*':
// Initial
packet.Tag = FilterSubstrings
packet.Description = FilterMap[uint64(packet.Tag)]
seq := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "Substrings")
seq.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, FilterSubstringsInitial, condition[:len(condition)-1], "Initial Substring"))
packet.AppendChild(seq)
default:
packet.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, condition, "Condition"))
}
newPos++
return packet, newPos, err
}
}
|
