My question is totally based on Https connections.
Scenario is as :
Suppose I m connecting to https://www.example.com and after accepting SSL Certificate, I login to the same site and a session gets eshtablished. Then I delete certificate from the Browser and try to browse the same site further and then my browser asks for Acceptance of the certificate for same site. Why so?
As far as I know After SSL handshake when a Secret Key gets generated that key is used for all encryption for that session. I don't think there is any need of Certificate after establishing session with the server. So why my browser is asking for the certificate in between the established session.
Related
I have multiple Intel NUCs out in the field that I use for displaying digital signage. Out of the thousands I have in the field, a couple complain with this error:
SSL certificate problem: self signed certificate in certificate chain. More details here: http://curl.haxx.se/docs/sslcerts.html, curl performs SSL certificate verification by default, using a "bundle" of Certificate Authority (CA) public keys (CA certs). If the default bundle file isn't adequate, you can specify an alternate file using the --cacert option. If this HTTPS server uses a certificate signed by a CA represented in the bundle, the certificate verification probably failed due to a problem with the certificate (it might be expired, or the name might not match the domain name in the URL). If you'd like to turn off curl's verification of the certificate, use the -k (or --insecure) option.
I've confirmed that the cert is not expired, and the domain name matches
These units are running on Debian 7
Could the network they are on cause this issue with some sort of firewall setting?
When you visit the website what certificate is shown in the web browser? In your curl bundle is that the same certificate which is supposed to be used for SSL encryption? I'd guess no. CA will sign your cert.pem so that web browsers will show your green lock thereby authenticating your website. You most likely have an issue on the back end with the configuration of your curl bundle. You need to make sure that your server is using the CA cert not a self signed certificate like ssl-cert-snakeoil.pem for example.
Essentially your website should be using a static IPv4 address. As far as a network firewall stopping an SSL handshake from happening that may be possible, I have seen it happen on specific ports for example port 22 for ssh connections may be blocked at the network gateway for inbound traffic on a client side computer attempting a connection to a server. The SYN/ACK https://tools.ietf.org/rfc/rfc793.txt TCP handshake may time out in that type of network fire wall situation. However since you are getting an explicit response from your server about a self signed cert a firewall issue does not seem to be the problem.
I secure successfully a Nifi Node (localhost) with SSL but I have always a yellow padlock in my browser as you can see in the pic here
Do you have any idea?
Thanks
If you used an untrusted certificate then this is expected behavior. You would have to purchase a real certificate for a real domain name in order for the browser to not warn you.
I see the description below:
Standalone : generates the certificate authority, keystores, truststores, and nifi.properties files in one command
Client/Server mode : uses a Certificate Authority Server that accepts Certificate Signing Requests from clients, signs them, and sends the resulting certificates back. Both client and server validate the other’s identity through a shared secret.
Standalone and client, both generate the certificate authority, keystores, truststores.
Sorry, I don't see the difference.
So i want to setup a payment server with hibiscus (https://www.willuhn.de/products/hibiscus-server/)
and make the connection encrypted with a trusted certificate.
Hibiscus is basically a java servlet which creates a own self
signed ssl certificate, which acording to the author can not be
replaced with another ssl certificate because the private key is
used to encrypt other things.
So my idea is: Setup nginx with a proxy from port 443 to hibiscuses port
8080, tell nginx to trust the certificate of hibiscus and encrypt
nginx's 443 with a letsencrypt cert.
nginx would need to unpack the secure content form hibiscus and then
repack it as its own content right?
Does anyone now if this is possible and how?
All help is much appreciated
It's not secure. Self signed certificate is not trusted by all of the browsers since the certificate is not signed by any trusted CA, which means, user may suffer from a man-in-the-middle attack. Consider what will happen if I also make a payment server and publish my self signed certificate? User agent can not distinguish which one is real at all.
I made HTTP proxy server. But the problem that I can't decrypt SSL traffic.
I found that Fiddler install Trust Root Certificate. I did the same and now I don't have error that certificate untrusted but I got other error: wrong Common Name (CN). How fiddler change the CN of installed trusted certificate?
Will appreciate any answer.
Fiddler acts as an SSL termination proxy.
I.e. the connection goes like this:
Browser ---(SSL handshake)---> Fiddler --- (SSL handshake) ---> Actual Site
So your connection is first time encrypted and sent to Fiddler, where it is first decrypted by Fiddler and then again encrypted to be sent to the actual site that you access.
Additionally when you access a site Fiddler automatically generates a server certificate with a CN that is equal to the host name of the site and this certificate is signed by the CA of fiddler That's why Fiddler needs to install a set of trusted CAs in your browser so that the first SSL handshake can be made against a trusted authority.
When I send a request a known site lik facebook, Google,... on https protocol, the certificates are appearing on browser via pedlock.
How the web site (facebook,google,..) certificate comes to my browser?
How my browser knows the certificate is valid? is asking the Certificate Authority company?
What means my computers trusted certificates (on Windows certmgr.msc)?
1. How the web site (facebook,google,..) certificate comes t y browser?
When your browser requests a website using the HTTPS protocol the transfer will start with a SSL/TLS handshake. During this handshake the server will submit the website certificate to your browser.
2. How my browser knows the certificate is valid? is asking the Certificate Authority company?
The website certificate is commonly provided by a certificate authority (CA). The CA has signed the website certificate with its own certificate - after it has verified the websites identity. Every browser has some certificates from trusted CAs pre-installed. These certificates are used to check if the submited website certificated is properly signed by the CA.
In addition the browser may use the Online Certificate Status Protocol (OSCP) to check if the website is still valid.
3. What meansmy computers trusted certificates (on Windows certmgr.msc)?
I guess this is a different topic. The CA certificates used for HTTPS connections are part of the browser (IE, FF, etc.) and no part of the operating system.
Additional notes
The way the browser displays a trusted HTTPS connection depends on the browser and of the type of the used certificate.
If you are interested in some details how the certificates are distributed, you may doa research to the topic of "Public-key infrastructure (PKI)"