By using s_client the CA list can be viewed and checked. This is normally because the server is not sending theĬlients certificate authority in its ``acceptable CA list'' when it That a web client complains it has no certificates or gives an empty list Play with these options before submitting a bug report to an OpenSSL mailing list.Ī frequent problem when attempting to get client certificates working is ssl3, -tls1, -no_ssl2, -no_ssl3, -no_tls1 options can be tried in case it is a buggy server. Nothing obvious like no client certificate then the -bugs, -ssl2, If the handshake fails then there are several possible causes, if it is Then an HTTP command can be given such as ``GET /'' to retrieve a web page. Would typically be used (https uses port 443). S_client can be used to debug SSL servers. R, and if the line begins with a Q or if end of file is reached, the connection will be closed down. Have been given), the session will be renegotiated if the line begins with When used interactively (which means neither -quiet nor -ign_eof If a connection is established with an SSL server then any data receivedįrom the server is displayed and any key presses will be sent to the The separator is for MS-Windows,, for OpenVMS, and : for all others. Multiple files can be specified separated by a OS-dependent character. Generator, or an EGD socket (see RAND_egd(3)). The engine will then be set as the default forĪ file or files containing random data used to seed the random number To attempt to obtain a functional reference to the specified engine, thus Specifying an engine (by it's unique id string) will cause s_client Protocol is a keyword for the intended protocol. Send the protocol-specific message(s) to switch to TLS for Supported cipher in the list sent by the client. Server determines which cipher suite is used it should take the first This allows the cipher list sent by the client to be modified. There are several known bug in SSL and TLS implementations. Work if TLS is turned off with the -no_tls option others will only support SSL v2 and may need the -ssl2 option. Unfortunately there are a lot of ancient and broken servers in use whichĬannot handle this technique and will fail to connect. Servers and permit them to use SSL v3, SSL v2 or TLS as appropriate. The initial handshake uses a method which should be compatible with all These options disable the use of certain SSL or TLS protocols. Inhibit printing of session and certificate information. Inhibit shutting down the connection when end of file is reached in the This option translated a line feed from the terminal into CR+LF as required Show all protocol messages with hex dump. Print extensive debugging information including a hex dump of all traffic. Option is not always accurate because a connection might never have been Useful because the cipher in use may be renegotiated or the connection mayįail because a client certificate is required or is requested only after anĪttempt is made to access a certain URL. Will only be printed out once if the connection succeeds. To print out information even if the connection fails. Print session information when the program exits. Pauses 1 second between each read and write call.ĭisplay the whole server certificate chain: normally only the server Reconnects to the same server 5 times using the same session ID, this canīe used as a test that session caching is working. These are also used when building the clientĪ file containing trusted certificates to use during server authenticationĪnd to use when attempting to build the client certificate chain. Must be in ``hash format'', see verify for more information. The directory to use for server certificate verification. As a side effect the connection will neverįail due to a server certificate verify failure. The verify operation continues after errors so all the problems with aĬertificate chain can be seen. This specifies the maximum length of the serverĬertificate chain and turns on server certificate verification. If not specified then the certificate file will be The certificate to use, if one is requested by the server. Then an attempt is made to connect to the local host on port 4433. This specifies the host and optional port to connect to. It is a very useful diagnostic tool for SSL servers. The s_client command implements a generic SSL/TLS client which connects to a remote host
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