[原创]CVE-2021-42287 Windows域内提权漏洞原理分析-二进制漏洞-看雪-安全社区|安全招聘|kanxue.com

[原创]CVE-2021-42287 Windows域内提权漏洞原理分析

发表于: 2022-5-17 14:57 11510

[原创]CVE-2021-42287 Windows域内提权漏洞原理分析

dre4merp

2022-5-17 14:57

11510

本文更多的是根据调试Windows Server 2003，分析漏洞成因。
阅读本文需要一定的Kerberos基础知识、Windows源码阅读调试能力。单纯的阅读可能并不能完全理解其中的关键点，需要进行调试理解。
第一次发文，格式或内容有任何不对的地方，还请各位大佬批评指正。

漏洞编号为：CVE-2021-42278 和 CVE-2021-42287

CVE-2021-42278：通常情况下，机器账户应以\$结尾，即DC$。
但是AD域并没有对其进行强校验。通过建立与域控同名却不以\$结尾的机器账户，即DC，对域控进行欺骗。

CVE-2021-42287：利用上述漏洞进行欺骗，请求到DC的TGT后，修改自身的机器账号。之后，利用Kerberos的S4U2Self机制，请求对于“自己”（DC）的ST，但是由于此时机器名已经被修改而无法找到DC，域控将会用DC$的Key进行加密，并向其中添加请求的账户名的PAC。至此便得到了高权限ST。

域控：Windows Server 2003 Debug版
攻击机：Windows 7 x64 SP1
武器化工具：https://github.com/cube0x0/noPac

使用SysinternalsSuite中的ADExplorer64工具查看域内的所有机器账户

ADExplorer

从上图中可以很明确的看到域控的机器名为WINSRVSERVER$，之后会使用WINSRVSERVER作为机器账户名进行欺骗。

相关准备工作不是本文重点，可以在noPac项目中学习

申请TGT时是根据修改后的机器账号WINSRVSERVER进行申请的。
域控调用I_GetASTicket处理AS_REQ消息
首先会调用KdcNormalize获得账户的相关信息包括UserInfo、ClientTicketInfo等
！！！请谨记这个函数，之后的漏洞利用过程会展开分析！！！

通过上面获得的ClientTicketInfo调用BuildTicketAS生成TGT，堆栈如下

查看参数ClientTicketInfo和ClientName可以看到此次是以WINSRVSERVER的身份去申请TGT。

上述函数工作完成后，查看生成的Ticket，即TGT

此时还没有向其中添加PAC，会通过之前获得的UserInfo调用KdcGetPacAuthData生成所需的PAC
此时的PAC为WINSRVSERVER的PAC，属于正常流程

之后便是将PAC放入TGT中，将其打包并使用krbtgt密钥进行加密，通过AS_REP消息传递回Client
关键代码如下，不再展开分析

还原机器账户名的目的是使得域控处理TGS_REQ请求的时候，找不到账户从而是用自己的Key加密

Client向域控申请WINSRVSERVER的服务票据，域控在HandleTGSRequest函数中处理TGS_REQ请求。

首先通过KerbFindPreAuthDataEntry获取TGS_REQ中包含的ApRequest

之后便是解析获得的APRequest获得解密后的TGT

KdcVerifyKdcRequest做了以下几件事情

查看这个函数的结果，获得了传过来的明文TGT和krbtgt的相关服务信息

之后会获取请求的相关信息

内容分别如下

之后会调用KdcFindS4UClientAndRealm来获取PA_DATA_FOR_USER这个结构中的内容
KdcFindS4UClientAndRealm函数会解析PaList并将其转换成KERB_PA_FOR_USER结构，目前需要注意的便是其中的userName是我们要请求的高权限用户的用户名Administrator

之后会通过KdcNormalize获取我们自身WINSRVSERVER的相关信息
其中的关键调用如下：

对于漏洞的利用便发生在这个函数中，并且利用了两次。
第一次实现了将申请的用户转换为域控上的Administrator
第二次实现了将申请的服务转换成WINSRVSERVER$
下面将详细分析漏洞点。

调用KdcNormalize时的相关参数中最重要的就是SourceCName
因为我们是在利用S4U2Self协议请求自身的ST，所以SourceCName也就是自身的名字WINSRVSERVER

之后在CheckSam条件中会调用到KdcGetTicketInfo来获取用户WINSRVSERVER的相关信息

此时OutputPrincipal的值为WINSRVSERVER，即我们自己的机器名DC，目前仍一切正常

之后会调用SamIGetUserLogonInformation2在SAM中查找对应的账户信息，但由于此时已经将创建的机器账号还原，所以并不能找到对应的账号，该函数会返回错误
但是系统并不会直接提示找不到账号，而是会在其后面添加'$'符号，将其作为机器账号再次查找

通过调试信息可以清晰的看到查找到的用户信息不再是WINSRVSERVER而是变成了WINSRVSERVER$也就是域控对应的机器账号UserId = 0x3ed
至此便完成了对于域控的欺骗，之后就是颁发ST的过程

至此，我们成功的请求的用户WINSRVSERVER伪装成了域控自身WINSRVSERVER$

之后再I_GetTGSTicket中，为了获得WINSRVSERVER这个服务的相关信息，又再次调用KdcNormalize，其中的流程与上述基本相同，这也就是漏洞的第二次利用。成功的将请求的服务从WINSRVSERVER伪装成WINSRVSERVER$

完成上述的两次利用后，其他过程都显得不再重要，但有一点仍然需要留意，便是关于PAC的问题。
之前TGT中的PAC主体为WINSRVSERVER，又是如何切换为申请的Administrator的，对于之前的PAC又是如何处理的。
下面将对这两点进行分析

S4U2self协议的意义是服务器模拟用户向域控申请针对自身的ST，即给予用户访问服务的权限，所以返回的ST中应该插入的是用户的PAC，即下图中的(2)(3)两个过程
而上一步中我们申请的TGT中的PAC，是不在下图中的Service1向KDC认证的过程中颁发的PAC
明白了这点也就明白了为什么PAC会被替换

以下堆栈及函数完成了生成ST并向其中添加了用户PAC

对于原本的TGT中的PAC并没有做任何处理，直接将其丢弃了。

本文介绍了CVE-2021-42278和CVE-2021-42287的漏洞背景,并从系统层面详细分析了漏洞成因，其关键点在于S4U2self过程中的欺骗。

https://www.rfc-editor.org/rfc/rfc4120.txt
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sfu/1fb9caca-449f-4183-8f7a-1a5fc7e7290a
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sfu/aceb70de-40f0-4409-87fa-df00ca145f5a
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-kile/ae60c948-fda8-45c2-b1d1-a71b484dd1f7
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-pac/c38cc307-f3e6-4ed4-8c81-dc550d96223c

写在前面
背景
环境配置
详细分析
Active Directory 目录树
攻击准备工作
申请TGT
还原机器账户名
申请ST
总结
参考

//new machine account
NewMachineAccount(argContainer, argDistinguishedName, argDomain, argDomainController, argMachineAccount, argMachinePassword, argVerbose, argRandom, credential);
 
//clean spn

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "serviceprincipalname", argMachineAccount, "", false, true, argVerbose, credential);
 
//set samaccountname

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "samaccountname", argMachineAccount, argDomainController.Split('.')[0], false, false, argVerbose, credential);

//new machine account

NewMachineAccount(argContainer, argDistinguishedName, argDomain, argDomainController, argMachineAccount, argMachinePassword, argVerbose, argRandom, credential);

//clean spn

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "serviceprincipalname", argMachineAccount, "", false, true, argVerbose, credential);

//set samaccountname

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "samaccountname", argMachineAccount, argDomainController.Split('.')[0], false, false, argVerbose, credential);

KerbErr = KdcNormalize(

                ClientName,

                NULL,

                RequestRealm,

                NULL,           // no source ticket

                NameFlags | KDC_NAME_CLIENT | KDC_NAME_FOLLOW_REFERRALS | KDC_NAME_CHECK_GC,

                FALSE,          // do not restrict user accounts (user2user)

                &ClientReferral,

                ClientRealm,

                &ClientTicketInfo,

                pExtendedError,

                &UserHandle,

                WhichFields,

                0L,

                &UserInfo,

                &GroupMembership

                );

KerbErr = KdcNormalize(

ClientName,

NULL,

RequestRealm,

NULL, // no source ticket

NameFlags | KDC_NAME_CLIENT | KDC_NAME_FOLLOW_REFERRALS | KDC_NAME_CHECK_GC,

FALSE, // do not restrict user accounts (user2user)

&ClientReferral,

ClientRealm,

&ClientTicketInfo,

pExtendedError,

&UserHandle,

WhichFields,

0L,

&UserInfo,

&GroupMembership

);

kd> kc
# 

KDCSVC!BuildTicketAS

KDCSVC!I_GetASTicket

KDCSVC!KdcGetTicket

KDCSVC!KdcAtqIoCompletion

NTDSATQ!ATQ_CONTEXT::IOCompletion

NTDSATQ!AtqpProcessContext

NTDSATQ!AtqPoolThread

kernel32!BaseThreadStart

kd> kc

#

00 KDCSVC!BuildTicketAS

01 KDCSVC!I_GetASTicket

02 KDCSVC!KdcGetTicket

03 KDCSVC!KdcAtqIoCompletion

04 NTDSATQ!ATQ_CONTEXT::IOCompletion

05 NTDSATQ!AtqpProcessContext

06 NTDSATQ!AtqPoolThread

07 kernel32!BaseThreadStart

kd> dt ClientTicketInfo

Local var @ 0x332fa00 Type _KDC_TICKET_INFO*
0x0332fcb4

   +0x000 AccountName      : _UNICODE_STRING "WINSRVSERVER"

   +0x008 TrustedForest    : _UNICODE_STRING ""

   +0x010 PasswordExpires  : _LARGE_INTEGER 0x7fffffff`ffffffff

   +0x018 fTicketOpts      : 0x7b

   +0x01c UserAccountControl : 0x80

   +0x020 UserId           : 0x472

   +0x024 TrustType        : 0

   +0x028 TrustAttributes  : 0

   +0x02c Passwords        : 0x0015eab8 _KERB_STORED_CREDENTIAL

   +0x030 OldPasswords     : 0x001522d0 _KERB_STORED_CREDENTIAL

   +0x034 TrustSid         : (null) 

   +0x038 PasswordVersion  : 1

   +0x03c LockoutThreshold : 0
kd> dt ClientName

Local var @ 0x332fa04 Type KERB_PRINCIPAL_NAME*
0x00084c44

   +0x000 name_type        : 0n1

   +0x004 name_string      : 0x000c3360 KERB_PRINCIPAL_NAME_name_string_s

kd> dx -id 0,0,89c47a68 -r1 ((KDCSVC!KERB_PRINCIPAL_NAME_name_string_s *)0xc3360)

((KDCSVC!KERB_PRINCIPAL_NAME_name_string_s *)0xc3360)                 : 0xc3360 [Type: KERB_PRINCIPAL_NAME_name_string_s *]

    [+0x000] next             : 0x0 [Type: KERB_PRINCIPAL_NAME_name_string_s *]

    [+0x004] value            : 0xb45d8 : "WINSRVSERVER" [Type: char *]

kd> dt ClientTicketInfo

Local var @ 0x332fa00 Type _KDC_TICKET_INFO*

0x0332fcb4

+0x000 AccountName : _UNICODE_STRING "WINSRVSERVER"

+0x008 TrustedForest : _UNICODE_STRING ""

+0x010 PasswordExpires : _LARGE_INTEGER 0x7fffffff`ffffffff

+0x018 fTicketOpts : 0x7b

+0x01c UserAccountControl : 0x80

+0x020 UserId : 0x472

+0x024 TrustType : 0

+0x028 TrustAttributes : 0

+0x02c Passwords : 0x0015eab8 _KERB_STORED_CREDENTIAL

+0x030 OldPasswords : 0x001522d0 _KERB_STORED_CREDENTIAL

+0x034 TrustSid : (null)

+0x038 PasswordVersion : 1

+0x03c LockoutThreshold : 0

kd> dt ClientName

Local var @ 0x332fa04 Type KERB_PRINCIPAL_NAME*

0x00084c44

+0x000 name_type : 0n1

+0x004 name_string : 0x000c3360 KERB_PRINCIPAL_NAME_name_string_s

kd> dx -id 0,0,89c47a68 -r1 ((KDCSVC!KERB_PRINCIPAL_NAME_name_string_s *)0xc3360)

((KDCSVC!KERB_PRINCIPAL_NAME_name_string_s *)0xc3360) : 0xc3360 [Type: KERB_PRINCIPAL_NAME_name_string_s *]

[+0x000] next : 0x0 [Type: KERB_PRINCIPAL_NAME_name_string_s *]

[+0x004] value : 0xb45d8 : "WINSRVSERVER" [Type: char *]

kd> dt KERB_ENCRYPTED_TICKET 0x332fabc
KDCSVC!KERB_ENCRYPTED_TICKET

   +0x000 bit_mask         : 0xc0

   +0x000 o                : [1]  "???"

   +0x004 flags            : tagASN1bitstring_t

   +0x00c key              : KERB_ENCRYPTION_KEY

   +0x018 client_realm     : 0x000c5098  "WINTESTYU03.COM"

   +0x01c client_name      : KERB_PRINCIPAL_NAME

   +0x024 transited        : KERB_TRANSITED_ENCODING

   +0x030 authtime         : tagASN1generalizedtime_t

   +0x03e starttime        : tagASN1generalizedtime_t

   +0x04c endtime          : tagASN1generalizedtime_t

   +0x05a renew_until      : tagASN1generalizedtime_t

   +0x068 client_addresses : (null) 

   +0x06c authorization_data : (null)

kd> dt KERB_ENCRYPTED_TICKET 0x332fabc

KDCSVC!KERB_ENCRYPTED_TICKET

+0x000 bit_mask : 0xc0

+0x000 o : [1] "???"

+0x004 flags : tagASN1bitstring_t

+0x00c key : KERB_ENCRYPTION_KEY

+0x018 client_realm : 0x000c5098 "WINTESTYU03.COM"

+0x01c client_name : KERB_PRINCIPAL_NAME

+0x024 transited : KERB_TRANSITED_ENCODING

+0x030 authtime : tagASN1generalizedtime_t

+0x03e starttime : tagASN1generalizedtime_t

+0x04c endtime : tagASN1generalizedtime_t

+0x05a renew_until : tagASN1generalizedtime_t

+0x068 client_addresses : (null)

+0x06c authorization_data : (null)

kd> dt AuthorizationData

Local var @ 0x332f9d0 Type PKERB_AUTHORIZATION_DATA_s

   +0x000 next             : (null) 

   +0x004 value            : PKERB_AUTHORIZATION_DATA_Seq

kd> dx -id 0,0,89c47a68 -r1 (*((KDCSVC!PKERB_AUTHORIZATION_DATA_Seq *)0x332f9d4))

(*((KDCSVC!PKERB_AUTHORIZATION_DATA_Seq *)0x332f9d4))                 [Type: PKERB_AUTHORIZATION_DATA_Seq]

    [+0x000] auth_data_type   : 128 [Type: long]

    [+0x004] auth_data        [Type: tagASN1octetstring_t]

kd> dx -id 0,0,89c47a68 -r1 (*((KDCSVC!tagASN1octetstring_t *)0x332f9d8))

(*((KDCSVC!tagASN1octetstring_t *)0x332f9d8))                 [Type: tagASN1octetstring_t]

    [+0x000] length           : 0x260 [Type: unsigned long]

    [+0x004] value            : 0x16c828 : 0x4 [Type: unsigned char *]

kd> db 0x16c828 l 260

0016c828  04 00 00 00 00 00 00 00-01 00 00 00 c0 01 00 00  ................

0016c838  48 00 00 00 00 00 00 00-0a 00 00 00 22 00 00 00  H..........."...

0016c848  08 02 00 00 00 00 00 00-06 00 00 00 14 00 00 00  ................

0016c858  30 02 00 00 00 00 00 00-07 00 00 00 14 00 00 00  0...............

0016c868  48 02 00 00 00 00 00 00-01 10 08 00 cc cc cc cc  H...............

0016c878  b0 01 00 00 00 00 00 00-00 00 02 00 c2 dd c3 d9  ................

0016c888  0f f7 d7 01 ff ff ff ff-ff ff ff 7f ff ff ff ff  ................

0016c898  ff ff ff 7f 56 b9 d8 d7-0f f7 d7 01 56 79 42 02  ....V.......VyB.

0016c8a8  d9 f7 d7 01 ff ff ff ff-ff ff ff 7f 18 00 18 00  ................

0016c8b8  04 00 02 00 00 00 00 00-08 00 02 00 00 00 00 00  ................

0016c8c8  0c 00 02 00 00 00 00 00-10 00 02 00 00 00 00 00  ................

0016c8d8  14 00 02 00 00 00 00 00-18 00 02 00 01 00 00 00  ................

0016c8e8  72 04 00 00 03 02 00 00-01 00 00 00 1c 00 02 00  r...............

0016c8f8  20 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00   ...............

0016c908  00 00 00 00 18 00 1a 00-20 00 02 00 16 00 18 00  ........ .......

0016c918  24 00 02 00 28 00 02 00-00 00 00 00 00 00 00 00  $...(...........

0016c928  80 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c938  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c948  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c958  00 00 00 00 0c 00 00 00-00 00 00 00 0c 00 00 00  ................

0016c968  57 00 49 00 4e 00 53 00-52 00 56 00 53 00 45 00  W.I.N.S.R.V.S.E.

0016c978  52 00 56 00 45 00 52 00-00 00 00 00 00 00 00 00  R.V.E.R.........

0016c988  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c998  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c9a8  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0016c9b8  00 00 00 00 01 00 00 00-03 02 00 00 07 00 00 00  ................

0016c9c8  0d 00 00 00 00 00 00 00-0c 00 00 00 57 00 49 00  ............W.I.

0016c9d8  4e 00 53 00 52 00 56 00-53 00 45 00 52 00 56 00  N.S.R.V.S.E.R.V.

0016c9e8  45 00 52 00 0c 00 00 00-00 00 00 00 0b 00 00 00  E.R.............

0016c9f8  52 00 45 00 4e 00 50 00-45 00 4e 00 47 00 59 00  W.I.N.T.E.S.T.Y.

0016ca08  55 00 30 00 33 00 00 00-04 00 00 00 01 04 00 00  U.0.3...........

0016ca18  00 00 00 05 15 00 00 00-db ac e2 f8 a5 b2 f3 d1  ................

0016ca28  a1 c4 3e 10 00 00 00 00-00 b4 a3 e5 0f f7 d7 01  ..>.............

0016ca38  18 00 57 00 49 00 4e 00-53 00 52 00 56 00 53 00  ..W.I.N.S.R.V.S.

0016ca48  45 00 52 00 56 00 45 00-52 00 00 00 00 00 00 00  E.R.V.E.R.......

0016ca58  76 ff ff ff c1 fc e6 ad-46 30 3f 05 5e ed 74 c0  v.......F0?.^.t.

0016ca68  20 7d c9 54 00 00 00 00-76 ff ff ff 42 e1 22 e3   }.T....v...B.".

0016ca78  3b 44 cd ee b7 d7 50 5f-2d f9 44 ab 00 00 00 00  ;D....P_-.D.....

kd> dt AuthorizationData

Local var @ 0x332f9d0 Type PKERB_AUTHORIZATION_DATA_s

+0x000 next : (null)

+0x004 value : PKERB_AUTHORIZATION_DATA_Seq

kd> dx -id 0,0,89c47a68 -r1 (*((KDCSVC!PKERB_AUTHORIZATION_DATA_Seq *)0x332f9d4))

(*((KDCSVC!PKERB_AUTHORIZATION_DATA_Seq *)0x332f9d4)) [Type: PKERB_AUTHORIZATION_DATA_Seq]

[+0x000] auth_data_type : 128 [Type: long]

[+0x004] auth_data [Type: tagASN1octetstring_t]

kd> dx -id 0,0,89c47a68 -r1 (*((KDCSVC!tagASN1octetstring_t *)0x332f9d8))

(*((KDCSVC!tagASN1octetstring_t *)0x332f9d8)) [Type: tagASN1octetstring_t]

[+0x000] length : 0x260 [Type: unsigned long]

[+0x004] value : 0x16c828 : 0x4 [Type: unsigned char *]

kd> db 0x16c828 l 260

0016c828 04 00 00 00 00 00 00 00-01 00 00 00 c0 01 00 00 ................

0016c838 48 00 00 00 00 00 00 00-0a 00 00 00 22 00 00 00 H..........."...

0016c848 08 02 00 00 00 00 00 00-06 00 00 00 14 00 00 00 ................

0016c858 30 02 00 00 00 00 00 00-07 00 00 00 14 00 00 00 0...............

0016c868 48 02 00 00 00 00 00 00-01 10 08 00 cc cc cc cc H...............

0016c878 b0 01 00 00 00 00 00 00-00 00 02 00 c2 dd c3 d9 ................

0016c888 0f f7 d7 01 ff ff ff ff-ff ff ff 7f ff ff ff ff ................

0016c898 ff ff ff 7f 56 b9 d8 d7-0f f7 d7 01 56 79 42 02 ....V.......VyB.

0016c8a8 d9 f7 d7 01 ff ff ff ff-ff ff ff 7f 18 00 18 00 ................

0016c8b8 04 00 02 00 00 00 00 00-08 00 02 00 00 00 00 00 ................

0016c8c8 0c 00 02 00 00 00 00 00-10 00 02 00 00 00 00 00 ................

0016c8d8 14 00 02 00 00 00 00 00-18 00 02 00 01 00 00 00 ................

0016c8e8 72 04 00 00 03 02 00 00-01 00 00 00 1c 00 02 00 r...............

0016c8f8 20 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ...............

0016c908 00 00 00 00 18 00 1a 00-20 00 02 00 16 00 18 00 ........ .......

0016c918 24 00 02 00 28 00 02 00-00 00 00 00 00 00 00 00 $...(...........

0016c928 80 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c938 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c948 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c958 00 00 00 00 0c 00 00 00-00 00 00 00 0c 00 00 00 ................

0016c968 57 00 49 00 4e 00 53 00-52 00 56 00 53 00 45 00 W.I.N.S.R.V.S.E.

0016c978 52 00 56 00 45 00 52 00-00 00 00 00 00 00 00 00 R.V.E.R.........

0016c988 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c998 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c9a8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0016c9b8 00 00 00 00 01 00 00 00-03 02 00 00 07 00 00 00 ................

0016c9c8 0d 00 00 00 00 00 00 00-0c 00 00 00 57 00 49 00 ............W.I.

0016c9d8 4e 00 53 00 52 00 56 00-53 00 45 00 52 00 56 00 N.S.R.V.S.E.R.V.

0016c9e8 45 00 52 00 0c 00 00 00-00 00 00 00 0b 00 00 00 E.R.............

0016c9f8 52 00 45 00 4e 00 50 00-45 00 4e 00 47 00 59 00 W.I.N.T.E.S.T.Y.

0016ca08 55 00 30 00 33 00 00 00-04 00 00 00 01 04 00 00 U.0.3...........

0016ca18 00 00 00 05 15 00 00 00-db ac e2 f8 a5 b2 f3 d1 ................

0016ca28 a1 c4 3e 10 00 00 00 00-00 b4 a3 e5 0f f7 d7 01 ..>.............

0016ca38 18 00 57 00 49 00 4e 00-53 00 52 00 56 00 53 00 ..W.I.N.S.R.V.S.

0016ca48 45 00 52 00 56 00 45 00-52 00 00 00 00 00 00 00 E.R.V.E.R.......

0016ca58 76 ff ff ff c1 fc e6 ad-46 30 3f 05 5e ed 74 c0 v.......F0?.^.t.

0016ca68 20 7d c9 54 00 00 00 00-76 ff ff ff 42 e1 22 e3 }.T....v...B.".

0016ca78 3b 44 cd ee b7 d7 50 5f-2d f9 44 ab 00 00 00 00 ;D....P_-.D.....

KerbErr = BuildReply(

            &ClientTicketInfo,

            (Nonce != 0) ? Nonce : RequestBody->nonce,

            &Ticket.server_name,

            Ticket.realm,

            ((RequestBody->bit_mask & addresses_present) != 0) ? RequestBody->addresses : NULL,

            &Ticket,

            &ReplyBody

            );
...  

KerbErr = KerbPackTicket(

            &Ticket,

            ServerKey,

            ServiceTicketInfo.PasswordVersion,

            &Reply.ticket

            );
...

KerbErr = KerbPackKdcReplyBody(

        &ReplyBody,

        (EncryptionKey.keyvalue.value != NULL) ? &EncryptionKey : ClientKey,

        (EncryptionKey.keyvalue.value != NULL) ? KERB_NO_KEY_VERSION : ClientTicketInfo.PasswordVersion,

        KERB_TGS_REP_SALT,

        KERB_ENCRYPTED_AS_REPLY_PDU,

        &Reply.encrypted_part

        );

KerbErr = BuildReply(

&ClientTicketInfo,

(Nonce != 0) ? Nonce : RequestBody->nonce,

&Ticket.server_name,

Ticket.realm,

((RequestBody->bit_mask & addresses_present) != 0) ? RequestBody->addresses : NULL,

&Ticket,

&ReplyBody

);

...

KerbErr = KerbPackTicket(

&Ticket,

ServerKey,

ServiceTicketInfo.PasswordVersion,

&Reply.ticket

);

...

KerbErr = KerbPackKdcReplyBody(

&ReplyBody,

(EncryptionKey.keyvalue.value != NULL) ? &EncryptionKey : ClientKey,

(EncryptionKey.keyvalue.value != NULL) ? KERB_NO_KEY_VERSION : ClientTicketInfo.PasswordVersion,

KERB_TGS_REP_SALT,

KERB_ENCRYPTED_AS_REPLY_PDU,

&Reply.encrypted_part

);

//undo samaccountname change

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "samaccountname", argMachineAccount, argMachineAccount, false, false, argVerbose, credential);

//undo samaccountname change

SetMachineAccountAttribute(argContainer, argDistinguishedName, argDomain, argDomainController, "samaccountname", argMachineAccount, argMachineAccount, false, false, argVerbose, credential);

ApRequest = KerbFindPreAuthDataEntry(

                KRB5_PADATA_TGS_REQ,

                RequestMessage->KERB_KDC_REQUEST_preauth_data

                );

ApRequest = KerbFindPreAuthDataEntry(

KRB5_PADATA_TGS_REQ,

RequestMessage->KERB_KDC_REQUEST_preauth_data

);

//验证请求。这包括对AP请求进行解码，找到合适的密钥来解密票据，并检查票据。

KerbErr = KdcVerifyKdcRequest(

            ApRequest->preauth_data.value,

            ApRequest->preauth_data.length,

            ClientAddress,

            TRUE,                           // this is a kdc request

            &UnmarshalledApRequest,

            &UnmarshalledAuthenticator,

            &SourceEncryptPart,

            &ReplyKey,

            &SourceTicketKey,

            &ServerTicketInfo,

            &UseSubKey,

            pExtendedError

            );

//验证请求。这包括对AP请求进行解码，找到合适的密钥来解密票据，并检查票据。

KerbErr = KdcVerifyKdcRequest(

ApRequest->preauth_data.value,

ApRequest->preauth_data.length,

ClientAddress,

TRUE, // this is a kdc request

&UnmarshalledApRequest,

&UnmarshalledAuthenticator,

&SourceEncryptPart,

&ReplyKey,

&SourceTicketKey,

&ServerTicketInfo,

&UseSubKey,

pExtendedError

);

kd> dt ServerTicketInfo

Local var @ 0x327fc48 Type _KDC_TICKET_INFO

   +0x000 AccountName      : _UNICODE_STRING "krbtgt"

   +0x008 TrustedForest    : _UNICODE_STRING ""

   +0x010 PasswordExpires  : _LARGE_INTEGER 0x7fffffff`ffffffff

   +0x018 fTicketOpts      : 0x7b

   +0x01c UserAccountControl : 0x11

   +0x020 UserId           : 0x1f6

   +0x024 TrustType        : 0

   +0x028 TrustAttributes  : 0

   +0x02c Passwords        : 0x00084bf0 _KERB_STORED_CREDENTIAL

   +0x030 OldPasswords     : 0x000c4010 _KERB_STORED_CREDENTIAL

   +0x034 TrustSid         : (null) 

   +0x038 PasswordVersion  : 2

   +0x03c LockoutThreshold : 0
 
kd> dt SourceEncryptPart

Local var @ 0x327fdd0 Type KERB_ENCRYPTED_TICKET*
0x000fcf90

   +0x000 bit_mask         : 0xd0

   +0x000 o                : [1]  "???"

   +0x004 flags            : tagASN1bitstring_t

   +0x00c key              : KERB_ENCRYPTION_KEY

   +0x018 client_realm     : 0x00106a18  "WINTESTYU03.COM"

   +0x01c client_name      : KERB_PRINCIPAL_NAME

   +0x024 transited        : KERB_TRANSITED_ENCODING

   +0x030 authtime         : tagASN1generalizedtime_t

   +0x03e starttime        : tagASN1generalizedtime_t

   +0x04c endtime          : tagASN1generalizedtime_t

   +0x05a renew_until      : tagASN1generalizedtime_t

   +0x068 client_addresses : (null) 

   +0x06c authorization_data : 0x000c3370 PKERB_AUTHORIZATION_DATA_s
 
kd> db authorization_data l 276

0017f168  30 82 02 72 30 82 02 6e-a0 04 02 02 00 80 a1 82  0..r0..n........

0017f178  02 64 04 82 02 60 04 00-00 00 00 00 00 00 01 00  .d...`..........

0017f188  00 00 c0 01 00 00 48 00-00 00 00 00 00 00 0a 00  ......H.........

0017f198  00 00 22 00 00 00 08 02-00 00 00 00 00 00 06 00  ..".............

0017f1a8  00 00 14 00 00 00 30 02-00 00 00 00 00 00 07 00  ......0.........

0017f1b8  00 00 14 00 00 00 48 02-00 00 00 00 00 00 01 10  ......H.........

0017f1c8  08 00 cc cc cc cc b0 01-00 00 00 00 00 00 00 00  ................

0017f1d8  02 00 02 4e 81 c8 1c f7-d7 01 ff ff ff ff ff ff  ...N............

0017f1e8  ff 7f ff ff ff ff ff ff-ff 7f 56 b9 d8 d7 0f f7  ..........V.....

0017f1f8  d7 01 56 79 42 02 d9 f7-d7 01 ff ff ff ff ff ff  ..VyB...........

0017f208  ff 7f 18 00 18 00 04 00-02 00 00 00 00 00 08 00  ................

0017f218  02 00 00 00 00 00 0c 00-02 00 00 00 00 00 10 00  ................

0017f228  02 00 00 00 00 00 14 00-02 00 00 00 00 00 18 00  ................

0017f238  02 00 08 00 00 00 72 04-00 00 03 02 00 00 01 00  ......r.........

0017f248  00 00 1c 00 02 00 20 00-00 00 00 00 00 00 00 00  ...... .........

0017f258  00 00 00 00 00 00 00 00-00 00 18 00 1a 00 20 00  .............. .

0017f268  02 00 16 00 18 00 24 00-02 00 28 00 02 00 00 00  ......$...(.....

0017f278  00 00 00 00 00 00 80 00-00 00 00 00 00 00 00 00  ................

0017f288  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0017f298  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0017f2a8  00 00 00 00 00 00 00 00-00 00 0c 00 00 00 00 00  ................

0017f2b8  00 00 0c 00 00 00 57 00-49 00 4e 00 53 00 52 00  ......W.I.N.S.R.

0017f2c8  56 00 53 00 45 00 52 00-56 00 45 00 52 00 00 00  V.S.E.R.V.E.R...

0017f2d8  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0017f2e8  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0017f2f8  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................

0017f308  00 00 00 00 00 00 00 00-00 00 01 00 00 00 03 02  ................

0017f318  00 00 07 00 00 00 0d 00-00 00 00 00 00 00 0c 00  ................

0017f328  00 00 57 00 49 00 4e 00-53 00 52 00 56 00 53 00  ..W.I.N.S.R.V.S.

0017f338  45 00 52 00 56 00 45 00-52 00 0c 00 00 00 00 00  E.R.V.E.R.......

0017f348  00 00 0b 00 00 00 52 00-45 00 4e 00 50 00 45 00  ......W.I.N.T.E.

0017f358  4e 00 47 00 59 00 55 00-30 00 33 00 00 00 04 00  S.T.Y.U.0.3.....

0017f368  00 00 01 04 00 00 00 00-00 05 15 00 00 00 db ac  ................

0017f378  e2 f8 a5 b2 f3 d1 a1 c4-3e 10 00 00 00 00 00 06  ........>.......

0017f388  7d ec a5 f7 d7 01 18 00-57 00 49 00 4e 00 53 00  }.......W.I.N.S.

0017f398  52 00 56 00 53 00 45 00-52 00 56 00 45 00 52 00  R.V.S.E.R.V.E.R.

0017f3a8  00 00 00 00 00 00 76 ff-ff ff 51 30 b4 c6 f1 8c  ......v...Q0....

0017f3b8  bf 3d 01 2f 7c 3d 75 9b-9d 8d 00 00 00 00 76 ff  .=./|=u.......v.

0017f3c8  ff ff 5a 8c df 90 88 38-ec 5d 6c 61 b8 46 bd bf  ..Z....8.]la.F..

0017f3d8  99 5c 00 00 00 00                                .\....

kd> dt ServerTicketInfo

Local var @ 0x327fc48 Type _KDC_TICKET_INFO

+0x000 AccountName : _UNICODE_STRING "krbtgt"

+0x008 TrustedForest : _UNICODE_STRING ""

+0x010 PasswordExpires : _LARGE_INTEGER 0x7fffffff`ffffffff

+0x018 fTicketOpts : 0x7b

+0x01c UserAccountControl : 0x11

+0x020 UserId : 0x1f6

+0x024 TrustType : 0

+0x028 TrustAttributes : 0

+0x02c Passwords : 0x00084bf0 _KERB_STORED_CREDENTIAL

+0x030 OldPasswords : 0x000c4010 _KERB_STORED_CREDENTIAL

+0x034 TrustSid : (null)

+0x038 PasswordVersion : 2

+0x03c LockoutThreshold : 0

kd> dt SourceEncryptPart

Local var @ 0x327fdd0 Type KERB_ENCRYPTED_TICKET*

0x000fcf90

+0x000 bit_mask : 0xd0

+0x000 o : [1] "???"

+0x004 flags : tagASN1bitstring_t

+0x00c key : KERB_ENCRYPTION_KEY

+0x018 client_realm : 0x00106a18 "WINTESTYU03.COM"

+0x01c client_name : KERB_PRINCIPAL_NAME

+0x024 transited : KERB_TRANSITED_ENCODING

+0x030 authtime : tagASN1generalizedtime_t

+0x03e starttime : tagASN1generalizedtime_t

+0x04c endtime : tagASN1generalizedtime_t

+0x05a renew_until : tagASN1generalizedtime_t

+0x068 client_addresses : (null)

+0x06c authorization_data : 0x000c3370 PKERB_AUTHORIZATION_DATA_s

kd> db authorization_data l 276

0017f168 30 82 02 72 30 82 02 6e-a0 04 02 02 00 80 a1 82 0..r0..n........

0017f178 02 64 04 82 02 60 04 00-00 00 00 00 00 00 01 00 .d...`..........

0017f188 00 00 c0 01 00 00 48 00-00 00 00 00 00 00 0a 00 ......H.........

0017f198 00 00 22 00 00 00 08 02-00 00 00 00 00 00 06 00 ..".............

0017f1a8 00 00 14 00 00 00 30 02-00 00 00 00 00 00 07 00 ......0.........

0017f1b8 00 00 14 00 00 00 48 02-00 00 00 00 00 00 01 10 ......H.........

0017f1c8 08 00 cc cc cc cc b0 01-00 00 00 00 00 00 00 00 ................

0017f1d8 02 00 02 4e 81 c8 1c f7-d7 01 ff ff ff ff ff ff ...N............

0017f1e8 ff 7f ff ff ff ff ff ff-ff 7f 56 b9 d8 d7 0f f7 ..........V.....

0017f1f8 d7 01 56 79 42 02 d9 f7-d7 01 ff ff ff ff ff ff ..VyB...........

0017f208 ff 7f 18 00 18 00 04 00-02 00 00 00 00 00 08 00 ................

0017f218 02 00 00 00 00 00 0c 00-02 00 00 00 00 00 10 00 ................

0017f228 02 00 00 00 00 00 14 00-02 00 00 00 00 00 18 00 ................

0017f238 02 00 08 00 00 00 72 04-00 00 03 02 00 00 01 00 ......r.........

0017f248 00 00 1c 00 02 00 20 00-00 00 00 00 00 00 00 00 ...... .........

0017f258 00 00 00 00 00 00 00 00-00 00 18 00 1a 00 20 00 .............. .

0017f268 02 00 16 00 18 00 24 00-02 00 28 00 02 00 00 00 ......$...(.....

0017f278 00 00 00 00 00 00 80 00-00 00 00 00 00 00 00 00 ................

0017f288 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0017f298 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0017f2a8 00 00 00 00 00 00 00 00-00 00 0c 00 00 00 00 00 ................

0017f2b8 00 00 0c 00 00 00 57 00-49 00 4e 00 53 00 52 00 ......W.I.N.S.R.

0017f2c8 56 00 53 00 45 00 52 00-56 00 45 00 52 00 00 00 V.S.E.R.V.E.R...

0017f2d8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0017f2e8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0017f2f8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

0017f308 00 00 00 00 00 00 00 00-00 00 01 00 00 00 03 02 ................

0017f318 00 00 07 00 00 00 0d 00-00 00 00 00 00 00 0c 00 ................

0017f328 00 00 57 00 49 00 4e 00-53 00 52 00 56 00 53 00 ..W.I.N.S.R.V.S.

0017f338 45 00 52 00 56 00 45 00-52 00 0c 00 00 00 00 00 E.R.V.E.R.......

0017f348 00 00 0b 00 00 00 52 00-45 00 4e 00 50 00 45 00 ......W.I.N.T.E.

0017f358 4e 00 47 00 59 00 55 00-30 00 33 00 00 00 04 00 S.T.Y.U.0.3.....

0017f368 00 00 01 04 00 00 00 00-00 05 15 00 00 00 db ac ................

0017f378 e2 f8 a5 b2 f3 d1 a1 c4-3e 10 00 00 00 00 00 06 ........>.......

0017f388 7d ec a5 f7 d7 01 18 00-57 00 49 00 4e 00 53 00 }.......W.I.N.S.

0017f398 52 00 56 00 53 00 45 00-52 00 56 00 45 00 52 00 R.V.S.E.R.V.E.R.

0017f3a8 00 00 00 00 00 00 76 ff-ff ff 51 30 b4 c6 f1 8c ......v...Q0....

0017f3b8 bf 3d 01 2f 7c 3d 75 9b-9d 8d 00 00 00 00 76 ff .=./|=u.......v.

0017f3c8 ff ff 5a 8c df 90 88 38-ec 5d 6c 61 b8 46 bd bf ..Z....8.]la.F..

0017f3d8 99 5c 00 00 00 00 .\....

KerbErr = KerbConvertPrincipalNameToKdcName(

            &ServerName,

            &RequestBody->KERB_KDC_REQUEST_BODY_server_name

            );
 
KerbErr = KerbConvertPrincipalNameToKdcName(

               &SourceClientName,

               &SourceEncryptPart->client_name

               );
 
KerbErr = KerbConvertRealmToUnicodeString(

               &SourceClientRealm,

               &SourceEncryptPart->client_realm

               );