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Questions tagged [certificates]

Questions about signed certificates and the processes involved (Creation, signing, accepting, viewing)

307 questions
386
votes
9 answers

How do I install a root certificate?

Can anyone point me to a good tutorial on installing a root certificate on Ubuntu? I've been provided with a .crt file. I gather that need to create a directory at /usr/share/ca-certificates/newdomain.org and place the .crt in that directory.…
Sparky1
  • 13,199
160
votes
7 answers

How to install certificates for command line

So in school we need to install a certificate to access https sites. In firefox, I can import the certificate. However, I can't do so with the command line. For example, running git push I get: fatal: unable to access 'https://github.com/user/repo':…
Universal Electricity
  • 1,715
60
votes
14 answers

How do I digitally sign a PDF with a S/MIME certificate?

I have already acquired a S/MIME certificate (a .p12 file) issued by an authority. Using it in Writer, I can digitally sign documents by following this procedure : How do I make a digital certificate available to LibreOffice Writer for digital…
Agmenor
  • 16,394
51
votes
11 answers

Add certificate authorities system-wide on Firefox

I want to add some root CAs that doesn't come with the default firefox on Ubuntu, but I don't know how. I tried adding them to the local certificates with certutil, but it didn't work. It messed up my certificates database. $ certutil -A -d…
Jorge Suárez de Lis
  • 2,966
36
votes
1 answer

What is the use/purpose of the ca-certificates package?

I have always wondered what it's used for but I found little documentation about it.
user567600
27
votes
1 answer

How does one remove a certificate authority's certificate from a system?

The ca-certificates package was just updated, and it caused the following changes on my Xubuntu 13.10 system: Running hooks in /etc/ca-certificates/update.d.... Adding debian:CA_Disig_Root_R1.pem Adding debian:CA_Disig_Root_R2.pem Adding…
John Feminella
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26
votes
8 answers

Force Pidgin to acept an invalid certificate

I am getting the following error on Pidgin 2.10.10-3.fc20 (libpurple 2.10.10). How can I force it to accept an invalid certificate? (According to this bug report it should be capable). Here's what I have done: visited the domain on Firefox, and…
That Brazilian Guy
  • 4,490
25
votes
6 answers

Certificate error when using Citrix Receiver

I am getting this error when attempting to load a Desktop module up within Citrix Receiver: What I don't understand is I can see this particular certificate is set to "Trust.." under any/all circumstances that I can find. This only happens in…
gravity
  • 1,219
19
votes
4 answers

How do I make a digital certificate available to LibreOffice Writer for digital signatures?

I obtained a client certificate from CAcert through Firefox. I want to use that certificate to sign a document created with LibreOffice Writer. In Writer, I click File > Digital Signatures... to get the Digital Signatures dialog which is supposed to…
Geoffrey
  • 445
18
votes
1 answer

Are the DigiNotar certificates supposed to be present in Firefox in a clean install?

Just installed Ubuntu 18.04 LTS, and noticed in Mozilla Firefox 70.0.1 (64-bit), two strange certificates that rang a bell for some reason. Not wanting to trust anywhere on the web for information in case I am being MiTM attacked, can anyone confirm…
Thomas L
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17
votes
6 answers

How to fix CA cert issues with Curl in Ubuntu 14.04?

I am using Ubuntu 14.04. When I use curl, I get the following error: curl: (77) error setting certificate verify locations: CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: From what I gather from googling, the CAfile location it is looking for is…
themaninthewoods
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17
votes
2 answers

Disable SSL certificate validation in Ubuntu totally

I am new to Linux and learning Linux on Ubuntu 18.0401 LTS installed on oracle virtualbox on company system. Company has private proxy network. So all the websites I browse on ubuntu pass through proxy and get ssl certificate issued by the company.…
Nikhil Kadi
  • 187
16
votes
4 answers

Install Certbot on ubuntu 20.04

I've been following a couple of tutorials to add ssl to my server (node application). I tried installing Certbot with the following line on by Ubuntu 20.04 server: sudo add-apt-repository ppa:certbot/certbot but got a warning and no install: This…
Orange Juice Jones
  • 293
16
votes
1 answer

List and remove unofficially installed CA certificates

This article expose how around 18% of HTTPS connections are being detected as intercepted by MITM proxies. As the great related paper states: To circumvent this validation, local software injects a self-signed CA certificate into the client…
Pablo Bianchi
  • 17,371
15
votes
1 answer

Why can't I import keys into the gnome keyring?

I'm trying to import a private key + certificate into my gnome key ring on Ubuntu 14.10, but the seahorse gui application won't let me, the 'import' button is greyed out: If I try it from the command line, I get the following error: $ gnome-keyring…
Steffan Karger
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