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How to set up Ldap and certificates on your own computer and send encrypted e-mails

0. TL;DR

E-Mail

Hostname: ldap.in.tum.de
Base DN: ou=IN,o=TUM,c=DE
Port number: 389



Ldap

Server: ldap.in.tum.de
Port: 389
Search Base: ou=IN,o=TUM,c=DE

1. Ubuntu - Thunderbird

1.1 Install certificate

Install certificate here, the best tutorial is given under this adress:
https://wiki.in.tum.de/Informatik/Helpdesk/BenutzerZertifikate#A_5.2_Unix_47Linux_45_Firefox_47Thunderbird

1.2 Use certificate for 'Sign' and 'Encrypt'

Choose EditAccount Settings
zertthun 1.jpg

At the tab Security at Digital Signing choose select
zertthun 2.jpg

At the following windows select the right certificate
zertthun 3.jpg

Thunderbird want to know, if we really want to encrypt and decrypt messages.
zertthun 4.jpg

1.3 Set up LDAP adress book

Select EditPreferences .
zertthun 5.jpg

At the tab CompositionAddressing: select Directory Server and go to Edit Directories.
zertthun 6.jpg

Click on Add.
zertthun 7.jpg

Fill in the form as it is shown at the window:

1.png

At the Thunderbird Preferences in the tab CompositionAddressing at Directory Server the former set LDAP should be chosen.
zertthun 9.jpg

1.4 Sign mails

When writing a mail, click on S/MIME and select 'Sign message'
zertthun 10.jpg

1.5 Encrypt mails

When writing a mail, click on S/MIME and select 'Encrypt message'
zertthun 11.jpg

2 Windows - Microsoft Outlook

2.1 Install certificate

Install certificate in Windows, the best tutorial is given under this adress::
https://wiki.in.tum.de/Informatik/Helpdesk/BenutzerZertifikate#A_5.3.1_Installation_in_Systemsteuerung

2.2 Zertifikat zum Verschlüsseln und Signieren auswählen

Click on File then Options.

outlook_new_1.png

outlook_new_2.png

Select Tab Trust Center the Settings for Trust Center.


outlook_new_3.png

Click at E-Mail Security , Settings.


outlook_new_4.png

The name for the security setting can be chosen arbitrarily and click at Signaturzertifikat then Select.


outlook_new_5.png

The next window show your certificate, just for your interest.


outlook_new_6.png

Close the windows Security Settings by clicking OK .


outlook_new_7.png

2.3 Set up LDAP adress book

Go from File to Account Settings klicken.

outlook_new_8.png

At the tab Adress books select New.


outlook_new_9.png

Select Internetverzeichnisdienst (LDAP) and click on Next.


outlook_new_10.png

Servername is ldap.in.tum.de and go to Advanced settings klicken.

2neu.png

Outlook must be restarted


outlook_new_12.png

In the tab connection under details select Port 389.

3neu.png

In the tab Search under Searchbase select Advanced and type in ou=IN,o=TUM,c=DE and click OK.


4.png At this window click on Next.

6neu.png

Everything is finished and then done

2.4 Look up after a Email adress with the LDAP

While composing a mail, click on the button: 'To..'

outlook_new_16.png

Select the adress book and look up the first name and/or the last name.

5neu.png

2.5 Sign mails

While composing a mail, go to the tab Options and select Sign anklicken.

outlook_new_18.png

2.6 Encrypt mails

While composing a mail, go to the tab Options and select Encrypt.

outlook_new_19.png

3 Mac OS - Apple Mail

3.1 Install certificate

Double click on the *.p12 file after downlaoding.
Bild1.png

Click on add.
Bild2.png

Type in the given passphrase.
Bild3.png

You can check the import under Keychain access under _My Certificates_
Bild4.png

3.2 Use certificate for 'Sign' and 'Encrypt'

This happens automatically, MacOS can map the certificate to the mails.

3.3 Set up LDAP adress book

Go to Systems Preferences...→Internet Accounts-->Add Other Account…and choose 'LDAP account'.

addldap.png

Fill out the form, like it is described in the screenshot

ldap_eins.png

Finally click on 'Sign in' and everything is fine.

3.4 Look up after a Email adress with the LDAP

When composing a new message, just look after the person, like as in an adress book.

3.5 Sign mails

Mails, sent from the in.tum adress are signed automatically
Bild5.png

3.6 Encrypt mails

ert hat.
Dies ist der Fall wenn man z.B. eine signierte E-Mail von dieser Person empfangen hat. It is only possible to send an encrypted mail, if you already saved the public key of the receiver in the KeyChain.

This happens e.g. as soon you received a signed mail from this person.


Bild6.png

Topic attachments
I Attachment Action Size Date Who Comment
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ldap_eins.pngpng ldap_eins.png manage 932 K 12 Oct 2018 - 09:51 StefanZiarasGa49taq  
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Topic revision: r26 - 02 Jul 2019, MichaelBauerGa73roh
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