How to Delete/Remove Certificates from Mono Certificate Stores My and Trust

How to delete/remove certificates from Mono certificate stores My and Trust?

1. How to remove the certificate from the stores (My,CA,Trust etc)?

Running this command:

certmgr -del -c -v -m Trust CERTHASH

Where CERTHASH is the number in Unique Hash (you can extract this value running certmgr -list -c -v -m YOURSTORE, see example at the end of my answer):

2. Where is Mono storing the certificate details in the system?

In some of these paths:

/usr/share/.mono/certs/
~/.config/.mono/certs/

Examples:

Add new certificate to Trust store (valid stores are: My, AddressBook, CA, Trust and Disallowed):

me@myserver:~$ certmgr -add -c -v -m Trust google.cer 
Mono Certificate Manager - version 3.2.6.0
Manage X.509 certificates and CRL from stores.
Copyright 2002, 2003 Motus Technologies. Copyright 2004-2008 Novell. BSD licensed.

1 certificate(s) added to store Trust.

List certificates:

me@myserver:~$ certmgr -list -c -v -m Trust
Mono Certificate Manager - version 3.2.6.0
Manage X.509 certificates and CRL from stores.
Copyright 2002, 2003 Motus Technologies. Copyright 2004-2008 Novell. BSD licensed.

X.509 v3 Certificate
  Serial Number: 7CBE60802548D325
  Issuer Name:   C=US, O=Google Inc, CN=Google Internet Authority G2
  Subject Name:  C=US, S=California, L=Mountain View, O=Google Inc, CN=*.google.com
  Valid From:    10/09/2014 14:03:47
  Valid Until:   09/12/2014 0:00:00
  Unique Hash:   4D348D0E4028C850A7C783413571111E8E3BD9DE
  Key Algorithm:        1.2.840.113549.1.1.1
  Algorithm Parameters: 0500
  Public Key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
  Signature Algorithm:  1.2.840.113549.1.1.5
  Algorithm Parameters: 0500
  Signature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
  Private Key:          False
  KeyPair Key:          False

Remove certificate:

me@myserver:~$ certmgr -del -c -v -m Trust 4D348D0E4028C850A7C783413571111E8E3BD9DE

Where is Mono installing the X509 certificates in Linux?

If I read the mono sources right, certificates should by default be in ~/.config/.mono/certs but I don't have any to check.

Mono.Security.Protocol.Tls.TlsException Received 0 bytes from stream in MVC under Mono

After inspecting logs, I've noticed that the system date was set to to 01/01/1970. After updating the date and restarting Apache, everything worked. I guess in my case the NTP was updating the date/time on boot every time and without internet connection was falling back to Unix epoch.

Mono https webrequest fails with The authentication or decryption has failed

Mono does not trust any certificate by default, to import the Mozilla trusted root authorities you can run mozroots --import --quiet in the mono installation folder where mozroots.exe is located

How can I make git accept a self signed certificate?

To permanently accept a specific certificate

Try http.sslCAPath or http.sslCAInfo. Adam Spiers's answer gives some great examples. This is the most secure solution to the question.

To disable TLS/SSL verification for a single git command

try passing -c to git with the proper config variable, or use Flow's answer:

git -c http.sslVerify=false clone https://example.com/path/to/git

To disable SSL verification for all repositories

It is possible to globally deactivate ssl verification. It is highly recommended to NOT do this but it is mentioned for completeness:

git config --global http.sslVerify false # Do NOT do this!

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There are quite a few SSL configuration options in git. From the man page of git config:

http.sslVerify
    Whether to verify the SSL certificate when fetching or pushing over HTTPS.
    Can be overridden by the GIT_SSL_NO_VERIFY environment variable.

http.sslCAInfo
    File containing the certificates to verify the peer with when fetching or pushing
    over HTTPS. Can be overridden by the GIT_SSL_CAINFO environment variable.

http.sslCAPath
    Path containing files with the CA certificates to verify the peer with when
    fetching or pushing over HTTPS.
    Can be overridden by the GIT_SSL_CAPATH environment variable.

A few other useful SSL configuration options:

http.sslCert
    File containing the SSL certificate when fetching or pushing over HTTPS.
    Can be overridden by the GIT_SSL_CERT environment variable.

http.sslKey
    File containing the SSL private key when fetching or pushing over HTTPS.
    Can be overridden by the GIT_SSL_KEY environment variable.

http.sslCertPasswordProtected
    Enable git's password prompt for the SSL certificate. Otherwise OpenSSL will
    prompt the user, possibly many times, if the certificate or private key is encrypted.
    Can be overridden by the GIT_SSL_CERT_PASSWORD_PROTECTED environment variable.

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