Lftp fatal error certificate verification not trusted

Fatal error certificate verification

Сегодня перенастраивал lFTP и столкнулся с проблемой при запуске зеркалирования папок:

lftp —> Fatal error: Certificate verification: Not trusted

Нашел на забугорных сайтах решение проблемы. Ее суть заключается в отключении проверки SSL сертификата. Для этого нужно в командой строке прописать:

Открываем файл lftp.conf для редактирования и вписываем куда нить строчку:

set ssl:verify-certificate off

Сохраняем изменения (Ctrl+O) и закрываем редактор (Ctrl+X).
Все, теперь lftp работает.
Надеюсь кому нить пригодится.

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lftp – Fatal error: Certificate verification: Not trusted

After accessing your ftp site of your hosting provider you get the following error: Fatal error: Certificate verification: Not trusted you can fix it by running the following command in the current section.

If you want to make the change permanently for your user, edit .lftp/rc file and add the following line:

If you want to make it permanent for all users edit the file /etc/lftp.conf and add the following line:

I add this part due to a rude comment, I appreciate and respect all comments, but I must clarify:

1. I wrote this article before Let’s Encrypt was created and some sites and service providers used self-signed certificates (it is possible that today there are some), as a way to create certain security while exchange information.

2. At the time of writing this article, I needed to access an ftp server of a business partner of the company for which I work and could only access via ftps but the server certificate was self-signed and could not change that since I had not control over the server; on the other hand I shouldn’t tell to a business partner: hey I can’t access your ftp server because you’re doing in a wrong way, please fix it and then let me know, business relationships don’t work in that way.

3. From the security point of view, the risk is that you are relying on a self-signed certificate and if the source is not trusted then it can trick you to obtain sensitive information, but that does not mean that the data travels in a clear format, This is the same thing that happens when you visit a site with a self-signed certificate (for example some site of your Intranet) and the browser “tells you”: Hey you are accessing a site with a certificate that I do not know (I can’t verify it because I do not have it within my root certificates), do you want to continue? As the source is trusted, you continue without it leading to security risks, however, whenever possible you should avoid self-signed certificates and not rely on unknown/unstrusted sources.

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Versatile Web Solutions

Delivering websites that work

LFTP FTPS and Certificate Verification

Plain old FTP offers no encryption of any kind, even the username and password are sent plain text. As a result an extension to FTP named FTPS (not to be confused with the totally unrelated SFTP), provides encryption for the username and password and optionally the data channel.

It does this by using Transport Layer Security or TLS the same used to secure websites. As with websites you setup public and private keys and use certificates to verify trust with the host you are connecting.

Now my server host offers off-site backup using FTP or FTPS, unfortunate they don’t use an properly trusted certificate, they use a self-signed certificate.

Self signed certificates are not bad, they still provide encryption but they do not offer any trust, ie verification of who you are talking to.

As a result when connecting to an FTP server using TLS with a self-signed certificate you will receive a message that the connection is not trusted. In lftp you get the message:

and then the connection is closed.

To bypass this message you can create a file named rc in

/.lftp and add the line:

this has the effect of disabling certificate verification. HOWEVER, this now means that no checking is performed so you have no idea who you are connecting to, you could be connecting to a hostile intermediary out to steal passwords!

There has to be a better way

Well a much safer option is to add the self signed public key into our local certificate store. This way we can verify that we are connecting to the expected server and not a hostile third party. To do this we first must download the public key from the server, for this we use openssl, run the following command

replace example.com with the host name of your ftp server and change the port number if different.

This will return a bunch of information, the bit we are interested in is under Certificate chain section. Copy the certificate which is the text which starts ——BEGIN CERTIFICATE—— and ends ——END CERTIFICATE—— and paste into a new file under

/.lftp eg. mycert.crt so you now have a file that reads:

Now create or edit a file named rc in the

/.lftp file and add the line

You should now be able to connect with no Certificate validation error.

If you now get a message which reads: Certificate verification: certificate common name doesn’t match requested host name this is because the Common Name or hostname specified in the certificate does not match the hostname you have connected to. To bypass this check you need to add the following additional line to the rc file:

In Summary

While this is not a perfect solution it is far more desirable than blindly connecting to a random server. Because if we are suddenly presented with a different certificate it is a sign that someone maybe tampering with your connection. Then again it maybe a legitimate certificate update, remember the certificate will expire eventually and will need to be updated.

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How to fix error “[SSL: CERTIFICATE_ VERIFY_FAILED] certificate verify failed” (_ssl.c:727)

While working with one of our banking sector clients (hybrid cloud ), we encountered the error:

fatal error: SSL validation failed for https://bucket_name.s3.ap-south-1.amazonaws.com/file_name “[SSL: CERTIFICATE_ VERIFY_FAILED] certificate verify failed” (_ssl.c:727)

Scenario:

I was copying one file from s3 bucket to one of the newly launched servers x.x.x.x via AWS cli with below mentioned command.

Above output is not giving enough information to troubleshoot this further. so i have used the openssl command.

Fig1a Fig1b

With the help of openssl command, I got to know that our network is blocking internet requests due to some proxy configured for all the internet requests.

But the question arises why it is giving certificate verification failed error ? Well, we need to understand first how TLS/SSL communication/handshake works. While performing GET operation on s3 via s3 cp command, it is making a https request on endpoint “https://bucket_name.s3.ap-south-1.amazonaws.com/file_name” which is breaking at point number 3 in Fig2 because proxy lies between client and s3 endpoint whose certificate verification is failing and also whitelisting is not done. (This type of warning also comes in browser while accessing some sites but you click on advance > proceed further to access the site)

Fig2: TLS/SSL Handshake

Note: Go through the blog, to know more about session keys and master secret.

Workaround:

So, workaround to this is either you create a vpc-endpoint to communicate with s3 within the private network or get your endpoint whitelisted at proxy level because all the internet requests are going via proxy in this network configured by the network proxy team.

Fig3: Before workaround

Fig4: After workaround

Conclusion

So in this blog, we have seen that AWS hits a regional endpoint over SSL when you access any AWS service ( s3 in our case ) and that endpoint resolves to public IP. But any hop like proxy ( configured for all the internet requests ) in between can restrict that request and we can bypass that proxy with VPC endpoint or whitelisting can solve this problem. Thanks for reading, I’d really appreciate your suggestions and feedback.

GIF reference:

Blog Pundit: Kapendra Singh and Sanjeev Pandey

Opstree is an End to End DevOps solution provider

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Git Clone Fails: Server Certificate Verification Failed

I’ve been unable to git clone just about any github repo because of this error

fatal: unable to access ‘github_url’: server certificate verification failed. CAfile: /home/ubuntu/.ssh/rel3_dodroot_2048.crt CRLFile: none

I’ve noticed a few other people have had a similar error, but with the certificate in the .ssl folder. I’ve never seen anyone have this problem with the certificate in the .ssh though, and I have no idea how to fix it.

• Nvidia Jetson TX1 running Ubuntu 14.04
• Specific Github of Interest (although it happens with all of them)
• https://github.com/rbgirshick/fast-rcnn.git

5 Answers 5

Ok, I found the solution. I guess a script (I hadn’t looked at) ran on my computer which ran the line

So the solution was simply to change run

I get same error like this and I run following command:

It works for me and I am using Ubuntu OS.

Careful with disabling security features like certificate verification! This error indicates that there’s some misconfiguration of your machine, assuming GitHub.com actually does have a valid cert. Overriding the error by disabling verification just adds more configuration issues without resolving the underlying problem.

In my case, I discovered that my system clock was wrong, and was set before the GitHub.com certificate was supposed to be valid. Fixing the clock resolved the issue without needing to expose my machine to security threats.

To do your clone without dealing with cert problem this post (disable certification verification) can help you.

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