SUSE® Presentation (44 pt.) · What is OAUTH? Most Have familiarity with TOTP -Google Authenticator-RSA Secure ID token 7. Comparison of HOTP and TOTP • Secret • Counter •

Secure AuthenticationTwo Factor Authentication

LDAP Based SSH Keys

Mark Gardner | UMB Financial Corporation

Noor Kreadly | Federal Reserve Bank of Kansas City

Prerequisites

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Software Used

• eDirectory 9.0

• iManager 3

• Nmashotp utility

• https://download.novell.com/Download?buildid=BfnNcVX8U_I

- Bundled with nmas

• Yubikey Personalization tool

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https://download.novell.com/Download?buildid=BfnNcVX8U_I

Directory Setup

• Needs CA configured

• Must have Intruder Detection enabled for Lockout

• Password Policy that Enables Universal Password

4

Other Setup

Configure the CA

https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algori

thm

5

https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm

Hashed One Time Passwords (HOTP)

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What is HOTP

What is OAUTH?

Most Have familiarity with TOTP

- Google Authenticator

- RSA Secure ID token

7

Comparison of HOTP and TOTP

• Secret

• Counter

• HMAC = Short “Token”

• Can be appended to normal password

Hashed One Time Password

• Secret

• Time

• Hashed to Generate “Token”

• Typically Requires client awareness

Timed One Time Password

8

Using Yubikey as a HOTP provider

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Yubikey by Yubico

Innovative keys offer strong authentication via Yubico one-time passwords

(OTP), FIDO Universal 2nd Factor (U2F), and smart card (PIV, OpenPGP,

OATH) — all with a simple tap or touch of a button. YubiKeys protect

access for everyone from individual home users to the world’s largest

organizations.

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Yubikey Customization Tool

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Enable Users to Require HOTP

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NMAS has HOTP already

• Included with NMAS in 2007

• Requires tool nmashotpconf

- Currently packaged with “Identity Assurance Suite”

- Nmashotp requires libraries from 8.8 but works just fine with eDirectory 9

- Missing libraries can be extracted from 8.8 rpms with cpio, or just take the shortcut and get it from my blog

Hashed One Time Password was developed in 2005

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Get nmashotpconf1. Extract eDirectry 8.8.8.8 to /usr/local/src/

2. Extract nmas3333-client.tgz to /usr/local/src

3. Move all the nams files to /root/bin/

4. cp /usr/local/src/3333/linux_x64/final/* /root/bin/

5. rpm2cpio /usr/local/src/eDirectory/setup/novell-NLDAPbase-8.8.8.8-0.x86_64.rpm | cpio-ivd ./opt/novell/eDirectory/lib64/libldapssl.so*

6. rpm2cpio /usr/local/src/eDirectory/setup/novell-NLDAPbase-8.8.8.8-0.x86_64.rpm | cpio-ivd ./opt/novell/eDirectory/lib64/libldapx.so*

7. rpm2cpio /usr/local/src/eDirectory/setup/novell-NLDAPsdk-8.8.8.8-0.x86_64.rpm |cpio -ivd ./opt/novell/eDirectory/lib64/libldapsdk.so*

8. mv opt/novell/eDirectory/lib64/* .

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Configuration Notes

Once the token has been configured the output file contains the

counter and the RAW secret. This information needs to be

protected and will be used in a later step.

15For Internal Use Only

Alternative OTP Providers

Fortunately OATH is an open standard and anyone can create a

device/software that is HOTP compatible.

• Google Authenticator

• Yes, it has a HTOP mode

• DuoKey

• Fortinet Tokens

• SafeID


Configure the Account

• The public key in pem format is required for this to work.

• ./nmashotpconf -h ldap.gtopia.org -p 636 -d cn=admin,o=gtopia -w ******* -e

/usr/local/src/GTOPIA.crt -t B64 -r 6 -y 6 -u cn=mark,ou=users,o=gtopia -d 8 -c 0 -o ENABLE

-s f5110f3be09fdb06d8fc0382c1f20da001ce85cf -f RAW

Use nmashotpconf


DEMO# ndslogin mark.users.gtopia -p markus

eDirectory Login: logged in as .CN=mark.OU=users.O=gtopia.GTOPIA.

# ./nmashotpconf -h ldap.gtopia.org -p 636 -D cn=admin,o=gtopia -w ***** \

-e /usr/local/src/GTOPIA.crt -t B64 -r 6 -y 6 -u cn=mark,ou=users,o=gtopia \

-d 8 -c 0 -o ENABLE -s f5110f3be09fdb06d8fc0382c1f20da001ce85cf -f RAW

# ndslogin mark.users.gtopia -p markus

Login for mark.users.gtopia.GTOPIA: failed, system failure (-632)

# ndslogin mark.users.gtopia -p markus96147987



Login for mark.users.gtopia.GTOPIA: failed, failed authentication (-669)



For Internal Use Only 18

Lockout Demonstration# ndslogin mark.users.gtopia -p markus48607419

[1] Instance at /etc/opt/novell/eDirectory/conf/nds.conf: ldap.OU=servers.O=gtopia.GTOPIA







Login for mark.users.gtopia.GTOPIA: failed, login lockout (-197)



Login for mark.users.gtopia.GTOPIA: failed, login lockout (-197)

For Internal Use Only 19

Configure SSSD

20

Prepare LDAP for SSH Keys

Schema Extensions to Add

- Other option would be to Extend the PosixUser Class to add an

optional openSSH Public Key Attributedn: cn=openssh-openldap,cn=schema,cn=config

objectClass: olcSchemaConfig

cn: openssh-openldap

olcAttributeTypes: {0}( 1.3.6.1.4.1.24552.500.1.1.1.13 NAME 'sshPublicKey' DES

C 'MANDATORY: OpenSSH Public key' EQUALITY octetStringMatch SYNTAX 1.3.6.1.4.

1.1466.115.121.1.40 )

olcObjectClasses: {0}( 1.3.6.1.4.1.24552.500.1.1.2.0 NAME 'ldapPublicKey' DESC

'MANDATORY: OpenSSH LPK objectclass' SUP top AUXILIARY MUST ( sshPublicKey $

uid ) )


The SSSD configuration

Next, add the option to your /etc/sssd/sssd.conf file:

[sssd]

config_file_version = 2

services = nss,pam,ssh

22

Configure SSH Daemon

The final step is to add a couple of lines to your

/etc/ssh/sshd_config file. Using

#vim /etc/ssh/sshd_config“

AuthorizedKeysCommand /usr/bin/sss_ssh_authorizedkeys

AuthorizedKeysCommandUser root

23

Thank You

25

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Documents

SUSE® Presentation (44 pt.) · What is OAUTH? Most Have familiarity with TOTP -Google Authenticator-RSA Secure ID token 7. Comparison of HOTP and TOTP • Secret • Counter •