我正在使用 Spring-LDAP 用 Java 编写程序。我需要实现一个方法，它应该通过 SID 搜索用户。出于这个原因，我使用像"&((objectClass=User)(objectSid="+sid+"))". 搜索不适用于字符串格式的 sid，例如"S-1-12-345677-5676743-223344-...".
使用 Apache Directory Studio，我可以使用以下过滤器定期查询我的 AD LDAP 数据库：(objectSid=\ff\01\03\04\1a\2b\...)成功。这是十六进制格式的 objectSid。
现在，如何在 Java 中将 SID 从字符串转换为十六进制，反之亦然？
Advapi32Util类中有convertSidToStringSid和convertStringSidToSid方法。
我不确定这是否是您需要的确切格式，但希望能让您更接近。
这是一篇描述 SID 格式的博文，可能会有所帮助。
ho1（使用 Advapi32Util）类建议的解决方案有两个限制：
因此，我编写了一个纯 Java 的类，没有外部依赖，可以在所有平台上工作。此类可以将安全标识符从它们的二进制文件转换为它们的文本表示形式，反之亦然。
如果您使用 Spring-LDAP，您也可以使用 LdapUtils 类提供的方法，但是这些方法不会对 SID 的格式进行任何检查，因此可能会产生不正确的结果或意外异常。
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class SidConverter {
private final static int MASK_8_BIT = 0xff;
private final static long MASK_32_BIT = 0xffffffffL;
private final static long MASK_48_BIT = 0xffffffffffffL;
public static String bytesToString(byte[] bytes) {
if (bytes.length < 8) {
throw new IllegalArgumentException(
"Binary SID representation must have at least 8 bytes but passed byte array has only "
+ bytes.length + " bytes.");
}
// The revision number is an unsigned 8-bit unsigned integer.
int revision = bytes[0] & MASK_8_BIT;
// The number of sub-authority parts is specified as an 8-bit unsigned
// integer.
int numberOfSubAuthorityParts = bytes[1] & MASK_8_BIT;
if (bytes.length != 8 + numberOfSubAuthorityParts * 4) {
throw new IllegalArgumentException(
"According to byte 1 of the SID it total length should be "
+ (8 + 4 * numberOfSubAuthorityParts)
+ " bytes, however its actual length is "
+ bytes.length + " bytes.");
}
// The authority is a 48-bit unsigned integer stored in big-endian
// format.
long authority = ByteBuffer.wrap(bytes).getLong() & MASK_48_BIT;
// The sub-authority consists of up to 255 32-bit unsigned integers in
// little-endian format. The number of integers is specified by
// numberOfSubAuthorityParts.
int[] subAuthority = new int[numberOfSubAuthorityParts];
ByteBuffer.wrap(bytes, 8, bytes.length - 8)
.order(ByteOrder.LITTLE_ENDIAN).asIntBuffer().put(subAuthority);
StringBuilder sb = new StringBuilder();
sb.append("S-");
sb.append(revision);
sb.append("-");
sb.append(authority);
for (int subAuthorityPart : subAuthority) {
sb.append("-");
sb.append(subAuthorityPart & MASK_32_BIT);
}
return sb.toString();
}
public static byte[] stringToBytes(String sid) {
if (!sid.startsWith("S-") && !sid.startsWith("s-")) {
throw new IllegalArgumentException("Invalid SID \"" + sid
+ "\": A valid SID must start with \"S-\".");
}
String[] parts = sid.split("-");
if (parts.length < 3) {
throw new IllegalArgumentException("Invalid SID \"" + sid
+ "\": A valid SID must have at least two dashes.");
}
if (parts.length > MASK_8_BIT + 3) {
throw new IllegalArgumentException("Invalid SID \"" + sid
+ "\": A valid SID must not have more than 257 dashes.");
}
int revision;
try {
revision = Integer.parseInt(parts[1]);
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Invalid revision part in SID \""
+ sid
+ "\": The revision must be an integer number between 0 and 255.");
}
if (revision < 0 || revision > MASK_8_BIT) {
throw new IllegalArgumentException(
"Invalid revision part in SID \""
+ sid
+ "\": The revision must be an integer number between 0 and 255.");
}
int numberOfSubAuthorityParts = parts.length - 3;
long authority;
try {
authority = Long.parseLong(parts[2]);
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Invalid authority part in SID \""
+ sid
+ "\": The authority must be an integer number between 0 and 281474976710655.");
}
if (authority < 0 || authority > MASK_48_BIT) {
throw new IllegalArgumentException(
"Invalid authority part in SID \""
+ sid
+ "\": The authority must be an integer number between 0 and 281474976710655.");
}
int[] subAuthority = new int[numberOfSubAuthorityParts];
for (int i = 0; i < numberOfSubAuthorityParts; i++) {
long subAuthorityPart;
try {
subAuthorityPart = Long.parseLong(parts[3 + i]);
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Invalid sub-authority part in SID \""
+ sid
+ "\": The sub-authority parts must be integer numbers between 0 and 4294967295.");
}
if (subAuthorityPart < 0 || subAuthorityPart > MASK_32_BIT) {
throw new IllegalArgumentException(
"Invalid sub-authority part in SID \""
+ sid
+ "\": The sub-authority parts must be integer numbers between 0 and 4294967295.");
}
subAuthority[i] = (int) subAuthorityPart;
}
byte[] bytes = new byte[8 + numberOfSubAuthorityParts * 4];
// We have to write the authority first, otherwise it would overwrite
// the revision and length bytes.
ByteBuffer.wrap(bytes).putLong(authority);
bytes[0] = (byte) revision;
bytes[1] = (byte) numberOfSubAuthorityParts;
ByteBuffer.wrap(bytes, 8, bytes.length - 8)
.order(ByteOrder.LITTLE_ENDIAN).asIntBuffer().put(subAuthority);
return bytes;
}
}
使用 InPlaceMsAdObjectSidValueEditor.java 中的 convertToString ：
protected String convertToString( byte[] bytes )
{
/*
* The binary data structure, from http://msdn.microsoft.com/en-us/library/cc230371(PROT.10).aspx:
* byte[0] - Revision (1 byte): An 8-bit unsigned integer that specifies the revision level of the SID structure. This value MUST be set to 0x01.
* byte[1] - SubAuthorityCount (1 byte): An 8-bit unsigned integer that specifies the number of elements in the SubAuthority array. The maximum number of elements allowed is 15.
* byte[2-7] - IdentifierAuthority (6 bytes): A SID_IDENTIFIER_AUTHORITY structure that contains information, which indicates the authority under which the SID was created. It describes the entity that created the SID and manages the account.
* Six element arrays of 8-bit unsigned integers that specify the top-level authority
* big-endian!
* and then - SubAuthority (variable): A variable length array of unsigned 32-bit integers that uniquely identifies a principal relative to the IdentifierAuthority. Its length is determined by SubAuthorityCount.
* little-endian!
*/
if ( bytes == null || bytes.length < 8 )
{
return Messages.getString( "InPlaceMsAdObjectSidValueEditor.InvalidSid" ); //$NON-NLS-1$
}
char[] hex = Hex.encodeHex( bytes );
StringBuffer sb = new StringBuffer();
// start with 'S'
sb.append( 'S' );
// revision
int revision = Integer.parseInt( new String( hex, 0, 2 ), 16 );
sb.append( '-' );
sb.append( revision );
// get count
int count = Integer.parseInt( new String( hex, 2, 2 ), 16 );
// check length
if ( bytes.length != ( 8 + count * 4 ) )
{
return Messages.getString( "InPlaceMsAdObjectSidValueEditor.InvalidSid" ); //$NON-NLS-1$
}
// get authority, big-endian
long authority = Long.parseLong( new String( hex, 4, 12 ), 16 );
sb.append( '-' );
sb.append( authority );
// sub-authorities, little-endian
for ( int i = 0; i < count; i++ )
{
StringBuffer rid = new StringBuffer();
for ( int k = 3; k >= 0; k-- )
{
rid.append( hex[16 + ( i * 8 ) + ( k * 2 )] );
rid.append( hex[16 + ( i * 8 ) + ( k * 2 ) + 1] );
}
long subAuthority = Long.parseLong( rid.toString(), 16 );
sb.append( '-' );
sb.append( subAuthority );
}
return sb.toString();
}
（来自 Apache 目录工作室）
没有 JNA 的示例
这是一些很好的紧凑代码，用于在不使用 JNA 的情况下转换 SID。它甚至通过返回 NULL、EMPTY 或零长度数组来内置一些“错误检查”，如果某些东西不太正确的话。
对于 SID 到字符串：
/**
* Converts Windows SID to a String. NULL input returns NULL.
* Invalid byte array returns EMPTY.
* @param sid SID as byte array.
* @return SID as String.
*/
public static String convertSidToStr(byte[] sid) {
if (sid==null) return null;
if (sid.length<8 || sid.length % 4 != 0) return "";
StringBuilder sb = new StringBuilder();
sb.append("S-").append(sid[0]);
int c = sid[1]; // Init with Subauthority Count.
ByteBuffer bb = ByteBuffer.wrap(sid);
// bb.order(ByteOrder.BIG_ENDIAN); // Not needed, default big endian.
sb.append("-").append((long)bb.getLong() & 0XFFFFFFFFFFFFL);
bb.order(ByteOrder.LITTLE_ENDIAN); // Now switch.
for (int i=0; i<c; i++) { // Create Subauthorities.
sb.append("-").append((long)bb.getInt() & 0xFFFFFFFFL);
}
return sb.toString();
}
对于字符串到 SID：
/**
* Converts Windows SID String to byte array. NULL input returns NULL.
* Invalid String returns zero-length byte array.
* @param sid SID as String.
* @return SID as byte array.
*/
public static byte[] convertStrToSid(String sid) {
if (sid==null) return null;
if (!sid.matches("^[sS]-\\d-\\d{1,13})"
+ "(?:-\\d{1,10})*$")) return new byte[0];
String[] ss = sid.split("-");
int c=ss.length-3; // Init with Subauthority Count.
byte[] b=new byte[2+6+(c*4)];
ByteBuffer bb = ByteBuffer.wrap(b);
// bb.order(ByteOrder.BIG_ENDIAN); // Not needed, default big endian.
bb.putLong(Long.parseLong(ss[2]));
// Overlay bytes 0 and 1 with Revision and Identifier Authority.
b[0]=(byte)Short.parseShort(ss[1]);
b[1]=(byte)c;
bb.order(ByteOrder.LITTLE_ENDIAN); // Now switch.
for (int i=0; i<c; i++) { // Create Subauthorities.
bb.putInt((int)Long.parseLong(ss[i+3]));
}
return b;
}
有关参考，请参阅 TechNet 的安全标识符结构。
来自http://miromannino.com/blog/convert-a-sid-to-string-with-java/
public static String convertSidToStringSid(byte[] sid) {
int offset, size;
// sid[0] is the Revision, we allow only version 1, because it's the
// only that exists right now.
if (sid[0] != 1)
throw new IllegalArgumentException("SID revision must be 1");
StringBuilder stringSidBuilder = new StringBuilder("S-1-");
// The next byte specifies the numbers of sub authorities (number of
// dashes minus two)
int subAuthorityCount = sid[1] & 0xFF;
// IdentifierAuthority (6 bytes starting from the second) (big endian)
long identifierAuthority = 0;
offset = 2;
size = 6;
for (int i = 0; i < size; i++) {
identifierAuthority |= (long) (sid[offset + i] & 0xFF) << (8 * (size - 1 - i));
// The & 0xFF is necessary because byte is signed in Java
}
if (identifierAuthority < Math.pow(2, 32)) {
stringSidBuilder.append(Long.toString(identifierAuthority));
} else {
stringSidBuilder.append("0x").append(
Long.toHexString(identifierAuthority).toUpperCase());
}
// Iterate all the SubAuthority (little-endian)
offset = 8;
size = 4; // 32-bits (4 bytes) for each SubAuthority
for (int i = 0; i < subAuthorityCount; i++, offset += size) {
long subAuthority = 0;
for (int j = 0; j < size; j++) {
subAuthority |= (long) (sid[offset + j] & 0xFF) << (8 * j);
// The & 0xFF is necessary because byte is signed in Java
}
stringSidBuilder.append("-").append(subAuthority);
}
return stringSidBuilder.toString();
}