├── LICENSE ├── README.md ├── main.go └── server └── proxy.go /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. This 15 | General Public License applies to most of the Free Software 16 | Foundation's software and to any other program whose authors commit to 17 | using it. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # goldap-proxy 2 | 3 | Use the goldap library to write an LDAP proxy 4 | 5 | The config can be changed in main.go, I'll add parameters later. 6 | 7 | # Installation 8 | 9 | ```bash 10 | go get github.com/lor00x/goldap-proxy 11 | ``` 12 | 13 | # How to run the LDAP proxy 14 | 15 | ```bash 16 | goldap-proxy 17 | ``` 18 | 19 | By default the proxy will listen on the port 2389 on all network interfaces and forward to 127.0.0.1:10389. 20 | This is the configuration I use for testing with Apache Directory Studio. 21 | 22 | You can change the configuration by editing the file "proxy/main.go" 23 | 24 | Once the proxy is running, you still need an LDAP proxy and client for testing. 25 | 26 | # Quickly setup an LDAP server and client for testing 27 | 28 | For testing I use Apache Directory Studio, you can download it here : http://directory.apache.org/studio/downloads.html 29 | 30 | ## Setup the LDAP server 31 | 32 | * Launch Apache Directory Studio. 33 | * In the lower left you should see the "LDAP Servers" panel (if not click on Window => Show view => LDAP Servers). 34 | * Click on the "New server" button 35 | * Select "ApacheDS 2.0.0" and click on finish 36 | * Double-click on the new server in the list, this should open the configuration in the central panel 37 | * Set 10389 as the LDAP server port 38 | * In the "Partitions" section, you should see an example dataset, this is perfect for our tests :-) 39 | * Save the configuration, select the server and click on the "Run" button 40 | 41 | ## Setup the LDAP client 42 | 43 | * Launch Apache Directory Studio 44 | * In the lower left you should see the "Connections" panel (if not click on Window => Show view => Connections) 45 | * Click on the "New connection" button 46 | * Enter a name, then setup 127.0.0.1 for the hostname and 2389 for the port (the port on which our Ldap proxy is listening) 47 | * Click on next, select "No Authentication" as authentication method 48 | * Click on finish, the connection should open automatically (if not, double click on it) 49 | * The content of the LDAP server should be displayed in the "LDAP Browser" panel 50 | * Now return to the console where you previously launched the goldap proxy, you should see the LDAP messages dumped as you browse the server :-) 51 | 52 | 53 | # Output example: 54 | 55 | ```bash 56 | $ cd goldap/proxy 57 | $ go run main.go 58 | 2014/10/25 17:53:52 Listening on port :2389... 59 | 2014/10/25 17:54:07 New connection accepted 60 | 2014/10/25 17:54:07 Message: PROXY1 - CLIENT - msg 2 61 | message.LDAPMessage{ 62 | messageID: 1, 63 | protocolOp: message.BindRequest{ 64 | version: 3, 65 | name: "", 66 | authentication: "", 67 | }, 68 | controls: (*message.Controls)(nil), 69 | } 70 | 71 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 1 72 | message.LDAPMessage{ 73 | messageID: 1, 74 | protocolOp: message.BindResponse{}, 75 | controls: (*message.Controls)(nil), 76 | } 77 | 78 | 2014/10/25 17:54:07 Message: PROXY1 - CLIENT - msg 3 79 | message.LDAPMessage{ 80 | messageID: 2, 81 | protocolOp: message.SearchRequest{ 82 | baseObject: "", 83 | scope: 0, 84 | derefAliases: 3, 85 | sizeLimit: 0, 86 | timeLimit: 0, 87 | typesOnly: false, 88 | filter: "objectClass", 89 | attributes: {"subschemaSubentry"}, 90 | }, 91 | controls: (*message.Controls)(nil), 92 | } 93 | 94 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 2 95 | message.LDAPMessage{ 96 | messageID: 2, 97 | protocolOp: message.SearchResultEntry{ 98 | objectName: "", 99 | attributes: { 100 | { 101 | type_: "subschemaSubentry", 102 | vals: {"cn=schema"}, 103 | }, 104 | }, 105 | }, 106 | controls: (*message.Controls)(nil), 107 | } 108 | 109 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 3 110 | message.LDAPMessage{ 111 | messageID: 2, 112 | protocolOp: message.SearchResultDone{}, 113 | controls: (*message.Controls)(nil), 114 | } 115 | 116 | 2014/10/25 17:54:07 Message: PROXY1 - CLIENT - msg 4 117 | message.LDAPMessage{ 118 | messageID: 3, 119 | protocolOp: message.SearchRequest{ 120 | baseObject: "cn=schema", 121 | scope: 0, 122 | derefAliases: 3, 123 | sizeLimit: 0, 124 | timeLimit: 0, 125 | typesOnly: false, 126 | filter: message.FilterEqualityMatch{attributeDesc:"objectClass", assertionValue:"subschema"}, 127 | attributes: {"createTimestamp", "modifyTimestamp"}, 128 | }, 129 | controls: (*message.Controls)(nil), 130 | } 131 | 132 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 4 133 | message.LDAPMessage{ 134 | messageID: 3, 135 | protocolOp: message.SearchResultEntry{ 136 | objectName: "cn=schema", 137 | attributes: { 138 | { 139 | type_: "modifyTimestamp", 140 | vals: {"20090818022733Z"}, 141 | }, 142 | { 143 | type_: "createTimestamp", 144 | vals: {"20090818022733Z"}, 145 | }, 146 | }, 147 | }, 148 | controls: (*message.Controls)(nil), 149 | } 150 | 151 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 5 152 | message.LDAPMessage{ 153 | messageID: 3, 154 | protocolOp: message.SearchResultDone{}, 155 | controls: (*message.Controls)(nil), 156 | } 157 | 158 | 2014/10/25 17:54:07 Message: PROXY1 - CLIENT - msg 5 159 | message.LDAPMessage{ 160 | messageID: 4, 161 | protocolOp: message.SearchRequest{ 162 | baseObject: "", 163 | scope: 0, 164 | derefAliases: 0, 165 | sizeLimit: 0, 166 | timeLimit: 0, 167 | typesOnly: false, 168 | filter: "objectClass", 169 | attributes: {"namingContexts", "subschemaSubentry", "supportedLDAPVersion", "supportedSASLMechanisms", "supportedExtension", "supportedControl", "supportedFeatures", "vendorName", "vendorVersion", "+", "objectClass"}, 170 | }, 171 | controls: (*message.Controls)(nil), 172 | } 173 | 174 | 2014/10/25 17:54:07 Message: PROXY1 - SERVER - msg 6 175 | message.LDAPMessage{ 176 | messageID: 4, 177 | protocolOp: message.SearchResultEntry{ 178 | objectName: "", 179 | attributes: { 180 | { 181 | type_: "vendorName", 182 | vals: {"Apache Software Foundation"}, 183 | }, 184 | { 185 | type_: "vendorVersion", 186 | vals: {"2.0.0-M14"}, 187 | }, 188 | { 189 | type_: "objectClass", 190 | vals: {"top", "extensibleObject"}, 191 | }, 192 | { 193 | type_: "subschemaSubentry", 194 | vals: {"cn=schema"}, 195 | }, 196 | { 197 | type_: "supportedLDAPVersion", 198 | vals: {"3"}, 199 | }, 200 | { 201 | type_: "supportedControl", 202 | vals: {"2.16.840.1.113730.3.4.3", "1.3.6.1.4.1.4203.1.10.1", "2.16.840.1.113730.3.4.2", "1.3.6.1.4.1.4203.1.9.1.4", "1.3.6.1.4.1.42.2.27.8.5.1", "1.3.6.1.4.1.4203.1.9.1.1", "1.3.6.1.4.1.4203.1.9.1.3", "1.3.6.1.4.1.4203.1.9.1.2", "1.3.6.1.4.1.18060.0.0.1", "2.16.840.1.113730.3.4.7", "1.2.840.113556.1.4.319"}, 203 | }, 204 | { 205 | type_: "supportedExtension", 206 | vals: {"1.3.6.1.4.1.1466.20036", "1.3.6.1.4.1.1466.20037", "1.3.6.1.4.1.18060.0.1.5", "1.3.6.1.4.1.18060.0.1.3", "1.3.6.1.4.1.4203.1.11.1"}, 207 | }, 208 | { 209 | type_: "supportedSASLMechanisms", 210 | vals: {"NTLM", "GSSAPI", "GSS-SPNEGO", "CRAM-MD5", "SIMPLE", "DIGEST-MD5"}, 211 | }, 212 | { 213 | type_: "entryUUID", 214 | vals: {"f290425c-8272-4e62-8a67-92b06f38dbf5"}, 215 | }, 216 | { 217 | type_: "namingContexts", 218 | vals: {"ou=system", "ou=schema", "dc=example,dc=com", "ou=config"}, 219 | }, 220 | { 221 | type_: "supportedFeatures", 222 | vals: {"1.3.6.1.4.1.4203.1.5.1"}, 223 | }, 224 | }, 225 | }, 226 | controls: (*message.Controls)(nil), 227 | } 228 | 229 | ``` 230 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "github.com/lor00x/goldap-proxy/server" 5 | ) 6 | 7 | func main() { 8 | server.Forward(":2389", "127.0.0.1:10389") 9 | } 10 | -------------------------------------------------------------------------------- /server/proxy.go: -------------------------------------------------------------------------------- 1 | package server 2 | 3 | import ( 4 | // "bufio" 5 | "errors" 6 | "fmt" 7 | "github.com/kr/pretty" 8 | "github.com/lor00x/goldap/message" 9 | "log" 10 | "net" 11 | ) 12 | 13 | // The Proxy is a program-in-the-middle which will dump every LDAP structures 14 | // exchanged between the client and the server 15 | type Proxy struct { 16 | name string 17 | dumpChan chan Message 18 | clientConn net.Conn 19 | serverConn net.Conn 20 | clientChan chan Message 21 | serverChan chan Message 22 | } 23 | 24 | // To dump each request we have to read the ASN.1 first bytes to get the lengh of the message 25 | // then build a slice of bytes with the correct quantity of data 26 | type Message struct { 27 | id int 28 | source string 29 | bytes []byte 30 | } 31 | 32 | func Forward(local string, remote string) { 33 | listener, err := net.Listen("tcp", local) 34 | if err != nil { 35 | log.Fatal(err) 36 | } 37 | log.Printf("Listening on port %s...", local) 38 | 39 | i := 0 40 | for { 41 | i++ 42 | var err error 43 | proxy := Proxy{name: fmt.Sprintf("PROXY%d", i)} 44 | proxy.clientConn, err = listener.Accept() 45 | if err != nil { 46 | log.Println(err) 47 | continue 48 | } 49 | proxy.serverConn, err = net.Dial("tcp", remote) 50 | if err != nil { 51 | log.Println(err) 52 | continue 53 | } 54 | 55 | log.Printf("New connection accepted") 56 | go proxy.start() 57 | } 58 | } 59 | 60 | func (p *Proxy) start() { 61 | p.dumpChan = make(chan Message) 62 | p.clientChan = make(chan Message) 63 | p.serverChan = make(chan Message) 64 | go p.dump() 65 | go p.readClient() 66 | go p.writeServer() 67 | go p.readServer() 68 | go p.writeClient() 69 | } 70 | 71 | func (p *Proxy) readClient() { 72 | messageid := 1 73 | for { 74 | var err error 75 | var bytes *[]byte 76 | bytes, err = p.readLdapMessageBytes(p.clientConn) 77 | if err != nil { 78 | p.clientConn.Close() 79 | log.Printf("%s: %s", p.name, "CLIENT DISCONNECTED") 80 | break 81 | } 82 | 83 | messageid++ 84 | message := Message{id: messageid, source: "CLIENT", bytes: *bytes} 85 | p.dumpChan <- message 86 | p.serverChan <- message 87 | } 88 | } 89 | 90 | func (p *Proxy) writeServer() { 91 | for msg := range p.serverChan { 92 | p.serverConn.Write(msg.bytes) 93 | } 94 | } 95 | 96 | func (p *Proxy) readServer() { 97 | messageid := 0 98 | for { 99 | var err error 100 | var bytes *[]byte 101 | bytes, err = p.readLdapMessageBytes(p.serverConn) 102 | if err != nil { 103 | p.serverConn.Close() 104 | log.Printf("%s: %s", p.name, "SERVER DISCONNECTED") 105 | break 106 | } 107 | messageid++ 108 | message := Message{id: messageid, source: "SERVER", bytes: *bytes} 109 | p.dumpChan <- message 110 | p.clientChan <- message 111 | } 112 | } 113 | 114 | func (p *Proxy) writeClient() { 115 | for msg := range p.clientChan { 116 | p.clientConn.Write(msg.bytes) 117 | } 118 | } 119 | 120 | func (p *Proxy) dump() { 121 | for msg := range p.dumpChan { 122 | result := "" 123 | // for _, onebyte := range msg.bytes { 124 | // if onebyte < 0x10 { 125 | // result = fmt.Sprintf("%s, 0x0%x", result, onebyte) 126 | // } else { 127 | // result = fmt.Sprintf("%s, 0x%x", result, onebyte) 128 | // } 129 | // } 130 | // Now decode the message 131 | message, err := p.decodeMessage(msg.bytes) 132 | if err != nil { 133 | result = fmt.Sprintf("%s\n%s", result, err.Error()) 134 | } else { 135 | result = fmt.Sprintf("%s\n%# v", result, pretty.Formatter(message)) 136 | } 137 | log.Printf("Message: %s - %s - msg %d %s\n\n", p.name, msg.source, msg.id, result) 138 | } 139 | } 140 | 141 | //func (p *Proxy) dumpCols() { 142 | // for msg := range p.dumpChan { 143 | // result := "" 144 | //// for _, onebyte := range msg.bytes { 145 | //// if onebyte < 0x10 { 146 | //// result = fmt.Sprintf("%s, 0x0%x", result, onebyte) 147 | //// } else { 148 | //// result = fmt.Sprintf("%s, 0x%x", result, onebyte) 149 | //// } 150 | //// } 151 | // // Now decode the message 152 | // message, err := p.decodeMessage(msg.bytes) 153 | // if err != nil { 154 | // result = fmt.Sprintf("%s\n%s", result, err.Error()) 155 | // } else { 156 | // result = fmt.Sprintf("%s\n%# v", result, pretty.Formatter(message)) 157 | // } 158 | // log.Printf("%s - %s - msg %d %s", p.name, msg.source, msg.id, result) 159 | // } 160 | //} 161 | 162 | func (p *Proxy) decodeMessage(bytes []byte) (ret message.LDAPMessage, err error) { 163 | defer func() { 164 | if e := recover(); e != nil { 165 | err = errors.New(fmt.Sprintf("%s", e)) 166 | } 167 | }() 168 | zero := 0 169 | ret, err = message.ReadLDAPMessage(message.NewBytes(zero, bytes)) 170 | return 171 | } 172 | 173 | func (p *Proxy) readLdapMessageBytes(conn net.Conn) (ret *[]byte, err error) { 174 | var bytes []byte 175 | var tagAndLength message.TagAndLength 176 | tagAndLength, err = p.readTagAndLength(conn, &bytes) 177 | if err != nil { 178 | return 179 | } 180 | p.readBytes(conn, &bytes, tagAndLength.Length) 181 | return &bytes, err 182 | } 183 | 184 | // Read "length" bytes from the connection 185 | // Append the read bytes to "bytes" 186 | // Return the last read byte 187 | func (p *Proxy) readBytes(conn net.Conn, bytes *[]byte, length int) (b byte, err error) { 188 | newbytes := make([]byte, length) 189 | n, err := conn.Read(newbytes) 190 | if n != length { 191 | fmt.Errorf("%d bytes read instead of %d", n, length) 192 | } else if err != nil { 193 | return 194 | } 195 | *bytes = append(*bytes, newbytes...) 196 | b = (*bytes)[len(*bytes)-1] 197 | return 198 | } 199 | 200 | // readTagAndLength parses an ASN.1 tag and length pair from a live connection 201 | // into a byte slice. It returns the parsed data and the new offset. SET and 202 | // SET OF (tag 17) are mapped to SEQUENCE and SEQUENCE OF (tag 16) since we 203 | // don't distinguish between ordered and unordered objects in this code. 204 | func (p *Proxy) readTagAndLength(conn net.Conn, bytes *[]byte) (ret message.TagAndLength, err error) { 205 | // offset = initOffset 206 | //b := bytes[offset] 207 | //offset++ 208 | var b byte 209 | b, err = p.readBytes(conn, bytes, 1) 210 | if err != nil { 211 | return 212 | } 213 | ret.Class = int(b >> 6) 214 | ret.IsCompound = b&0x20 == 0x20 215 | ret.Tag = int(b & 0x1f) 216 | 217 | // // If the bottom five bits are set, then the tag number is actually base 128 218 | // // encoded afterwards 219 | // if ret.tag == 0x1f { 220 | // ret.tag, err = parseBase128Int(conn, bytes) 221 | // if err != nil { 222 | // return 223 | // } 224 | // } 225 | // We are expecting the LDAP sequence tag 0x30 as first byte 226 | if b != 0x30 { 227 | panic(fmt.Sprintf("Expecting 0x30 as first byte, but got %#x instead", b)) 228 | } 229 | 230 | b, err = p.readBytes(conn, bytes, 1) 231 | if err != nil { 232 | return 233 | } 234 | if b&0x80 == 0 { 235 | // The length is encoded in the bottom 7 bits. 236 | ret.Length = int(b & 0x7f) 237 | } else { 238 | // Bottom 7 bits give the number of length bytes to follow. 239 | numBytes := int(b & 0x7f) 240 | if numBytes == 0 { 241 | err = message.SyntaxError{"indefinite length found (not DER)"} 242 | return 243 | } 244 | ret.Length = 0 245 | for i := 0; i < numBytes; i++ { 246 | 247 | b, err = p.readBytes(conn, bytes, 1) 248 | if err != nil { 249 | return 250 | } 251 | if ret.Length >= 1<<23 { 252 | // We can't shift ret.length up without 253 | // overflowing. 254 | err = message.StructuralError{"length too large"} 255 | return 256 | } 257 | ret.Length <<= 8 258 | ret.Length |= int(b) 259 | if ret.Length == 0 { 260 | // DER requires that lengths be minimal. 261 | err = message.StructuralError{"superfluous leading zeros in length"} 262 | return 263 | } 264 | } 265 | } 266 | 267 | return 268 | } 269 | --------------------------------------------------------------------------------