![]() ZGYub2ZmaWNlLmNvbYIaYXR0YWNobWVudHMtc2RmLm9mZmljZS5uZXSCCioubGl2 ![]() GiFjY3Mtc2RmLmxvZ2luLm1pY3Jvc29mdG9ubGluZS5jb22CGHN1YnN0cmF0ZS1z LmZvb3RwcmludGRucy5jb22CHWNjcy5sb2dpbi5taWNyb3NvZnRvbmxpbmUuY29t YWNobWVudC5vdXRsb29rLmxpdmUubmV0gh1hdHRhY2htZW50Lm91dGxvb2sub2ZmĪWNlLm5ldIIgYXR0YWNobWVudC5vdXRsb29rLm9mZmljZXBwZS5uZXSCFmF0dGFjĪG1lbnRzLm9mZmljZS5uZXSCFiouY2xvLmZvb3RwcmludGRucy5jb22CFioubnJi Ki5vdXRsb29rLmNvbYILb3V0bG9vay5jb22CDW9mZmljZTM2NS5jb22CDyoub2ZmĪWNlMzY1LmNvbYIXKi5vdXRsb29rLm9mZmljZTM2NS5jb22CDCoub2ZmaWNlLmNvīYISb3V0bG9vay5vZmZpY2UuY29tghRzdWJzdHJhdGUub2ZmaWNlLmNvbYIbYXR0 GBTdUdCiMXOpc66PtAF+XYxXy5/w9zAdBgNVHQ4EFgQUL0fgu9ydQXD6H71pyHQgĬhVi6/AwggIQBgNVHREEggIHMIICA4IWKi5pbnRlcm5hbC5vdXRsb29rLmNvbYIN ![]() j2aOIlN7MjZgYT0vvyH+tl/Z23Ds3xRAgMBAAGjggV1MIIFcTAfBgNVHSMEGDAW JHe8DDY7/6nDSZ4w+SzyPOlpvvhEe9Yqo+dWpKctTq7hLsc3Mj+zTxUKetp98zrjĬdnjPh5lL159a8Le2TBNK6dHBm+iuhgc0aHU2LK15evx2zC9h83qJNd9gcLJ85P3 KftaKNsOn3RyTU21EFhTQZCtMIeO4fNr5wjDoseArGRsKBYvabCOwM3qShL0cBZ3 PK6J3QkYklqSwdHz3o4vjqDnizb8fnLl18H689E04NOikUxvDbcKKOWCn3uT0Iom GgEKAoIBAQDetpbO/GvfvQExupvq/gN7BYoENrzXfo0vBX08585S3rTFVYRKbo2z MTExOTEyMDAwMFowajELMAkGA1UEBhMCVVM圎zARBgNVBAgTCldhc2hpbmd0b24xĮDAOBgNVBAcTB1JlZG1vbmQxHjAcBgNVBAoTFU1pY3Jvc29mdCBDb3Jwb3JhdGlvījEUMBIGA1UEAxMLb3V0bG9vay5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMSUwIwYDVQQDEx圎ĪWdpQ2VydCBDbG91ZCBTZXJ2aWNlcyBDQS0xMB4XDTE4MTExOTAwMDAwMFoXDTIw MIIItjCCB56gAwIBAgIQC74LhQl0K3v4f4DcFGdtVDANBgkqhkiG9w0BAQsFADBL The actual public server certificate is next: Server certificate I:/C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1ġ s:/C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1 The next section contains details about the certificate chain: Certificate chainĠ s:/C=US/ST=Washington/L=Redmond/O=Microsoft Corporation/CN= Verify error:num=20:unable to get local issuer certificate Loading 'screen' into random state - doneĭepth=1 /C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1 The first section presented is around the connection information: openssl s_client -connect :443 The following example is showing a connection on port 443 against. The output generated contains multiple sections with - spearators between them. Where is replaced with the fully qualified domain name (FQDN) of the server we want to check. To query a smtp server you would do the following: openssl s_client -connect :25 -starttls smtp To query a web server you would do the following: openssl s_client -connect :443 The syntax that we use depends on what type of server we are querying. For this article I will be using the Windows version of OpenSSL which can be downloaded from. OpenSSL is available for multiple platforms including Linux, MacOS & Windows (via gnuwin32). OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. While there are multiple methods that can be used to validate a certificate presented from a server I am going to be focusing on openssl here. ![]() Sometimes this is a SMTP server or it could be a web server. As of OpenSSL 0.9.8 you can choose from smtp, pop3, imap, and ftp as starttls options.From time to time it may be necessary to verify what certificate is being presented by the server that you are connecting to. Incidentally, this typically means that the server you’re connecting to is IIS.īut what if you want to connect to something other than a bog standard webserver on port 443? Well, if you need to use starttls that is also available. If the server was configured to potentially accept client certs the returned data would include a list of “acceptable client CAs”.Ĭonnection was made via TLSv1/SSLv3 and the chosen cipher was RC4-MD5. If you’re only looking for the end entity certificate then you can rapidly find it by looking for this section. The server certificate section is a duplicate of level 0 in the chain. Chains can be much longer than 2 certificates in length. Subject and issuer information is provided for each certificate in the presented chain. This particular server (has sent an intermediate certificate as well. s: is the subject line of the certificate and i: contains information about the issuing CA. At level 0 there is the server certificate with some parsed information. The certificate chain consists of two certificates. There’s a lot of data here so I have truncated several sections to increase readability. SSL handshake has read 2123 bytes and written 300 bytes Issuer=/C=US/O=SecureTrust Corporation/CN=SecureTrust CA Subject=/C=US/ST=Texas/L=Carrollton/O=Woot Inc/CN=*. (limits liab.)/OU=(c) 1999 Limited/CN= Secure Server Certification Authority I:/C=US/O=SecureTrust Corporation/CN=SecureTrust CAġ s:/C=US/O=SecureTrust Corporation/CN=SecureTrust CA 0 s:/C=US/ST=Texas/L=Carrollton/O=Woot Inc/CN=*.
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