OpenSSL provides different features and tools for SSL/TLS related operations. s_lient
is a tool used to connect, check, list HTTPS, TLS/SSL related information. Simply we can check remote TLS/SSL connection with s_client
. In these tutorials, we will look at different use cases of s_client
.
- Openssl Failed To Enumerate Slots List
- Openssl Pkcs11 Failed To Enumerate Slots
- Openssl Failed To Enumerate Slots Software
Call-back data passed by the OpenSSL from an application are application specific data opaque to an engine. + fail0('failed to enumerate slots '). DuplicateOutput1 Failed: 0x80070005 (Access is denied.) DuplicateOutput1 Failed: 0x80070005 (Access is denied.) is a capture API failure and has nothing to do with the ivshmem device. I really need to see the entire output to have a hope of diagnosis. 7/5/16 19:36:45.480 softhsm2-util8385: SimpleConfigLoader.cpp(84): Could not open the config file: /Users/uri/softhsm.conf 7/5/16 19:36:45.480 softhsm2-util8385: Configuration.cpp(158): Failed to load the SoftHSM configuration 7/5/16 19:37:49.099 softhsm2-util8388: ObjectStore.cpp(59): Failed to enumerate object store in /opt/local/var. C (Cpp) X509getsubjectname - 30 examples found.These are the top rated real world C (Cpp) examples of X509getsubjectname extracted from open source projects. You can rate examples to help us improve the quality of examples.
![Openssl failed to enumerate slots games Openssl failed to enumerate slots games](https://user-images.githubusercontent.com/151919/83202732-dba6a600-a10d-11ea-9a60-c4e06a0304e5.png)
Check TLS/SSL Of Website
The basic and most popular use case for s_client
is just connecting remote TLS/SSL website. We will provide the web site with the HTTPS port number. In this example we will connect to the poftut.com
.
Check TLS/SSL Of Website with Specifying Certificate Authority
If the web site certificates are created in house or the web browsers or Global Certificate Authorities do not sign the certificate of the remote site we can provide the signing certificate or Certificate authority. We will use -CAfile
by providing the Certificate Authority File.
Connect Smtp and Upgrade To TLS
We can use s_client
to test SMTP protocol and port and then upgrade to TLS connection. We will use -starttls smtp
command. We will use the following command.
![Openssl Failed To Enumerate Slots Openssl Failed To Enumerate Slots](https://st768.s3.eu-central-1.amazonaws.com/d0b9279a894c6af2c0add87f6c33f9a0/10961/unknown-ssid-clients-dea.jpg)
Connect HTTPS Site Disabling SSL2
HTTPS or SSL/TLS have different subversions. We can enable or disable the usage of some of them. In this example, we will disable SSLv2 connection with the following command.
![Failed Failed](https://www.researchgate.net/publication/342826318/figure/fig2/AS:911586659151873@1594350604733/FIGURE18-Overview-of-typical-Graphics-Processing-Unit-GPU-architecture-a_Q320.jpg)
Connect HTTPS Only TLS1 or TLS2
![Enumerate Enumerate](https://wiki.sepsoftware.com/wiki/images/New_media_event_Beefalo.jpg)
Check TLS/SSL Of Website
The basic and most popular use case for s_client
is just connecting remote TLS/SSL website. We will provide the web site with the HTTPS port number. In this example we will connect to the poftut.com
.
Check TLS/SSL Of Website with Specifying Certificate Authority
If the web site certificates are created in house or the web browsers or Global Certificate Authorities do not sign the certificate of the remote site we can provide the signing certificate or Certificate authority. We will use -CAfile
by providing the Certificate Authority File.
Connect Smtp and Upgrade To TLS
We can use s_client
to test SMTP protocol and port and then upgrade to TLS connection. We will use -starttls smtp
command. We will use the following command.
Connect HTTPS Site Disabling SSL2
HTTPS or SSL/TLS have different subversions. We can enable or disable the usage of some of them. In this example, we will disable SSLv2 connection with the following command.
Connect HTTPS Only TLS1 or TLS2
Like the previous example, we can specify the encryption version. In this example, we will only enable TLS1 or TLS2 with the -tls1_2
.
Specify Cipher or Encryption Type
We can specify the cipher with the -cipher
option like below.
Openssl Failed To Enumerate Slots List
Connect HTTPS Only RC4-SHA
We can also specify the hash algorithm of the encryption protocol. In this example, we will only enable RC4-SHA
hash algorithm for SSL/TLS connection. We will use -cipher RC4-SHA
. All other encryption and Cipher types will be denied and the connection will be closed.
Openssl Pkcs11 Failed To Enumerate Slots
Debug SSL/TLS To The HTTPS
Openssl Failed To Enumerate Slots Software
While a SSL/TLS connection is made there is a lot of operation under the hood. If we have some problems or we need detailed information about the SSL/TLS initialization we can use -tlsextdebug
option like below.