![]() Use the server's cipher preferences only used for SSLV2. See the ciphers command for more information. Although the server determines which cipher suite is used it should take the first supported cipher in the list sent by the client. This allows the cipher list sent by the client to be modified. For a list of all curves, use: $ openssl ecparam -list_curves -cipher cipherlist The curve is is ultimately selected by the server. Specifies the list of supported curves to be sent by the client. For example strings, see SSL_CTX_set1_sigalgs(3) -curves curvelist The server selects one entry in the list based on its preferences. Specifies the list of signature algorithms that are sent by the client. Adding this option enables various workarounds. There are several known bug in SSL and TLS implementations. Send TLS_FALLBACK_SCSV in the ClientHello. By default the initial handshake uses a version-flexible method which will negotiate the highest mutually supported protocol version. These options require or disable the use of the specified SSL or TLS protocols. This option must be provided in order to use a PSK cipher. The key is given as a hexadecimal number without leading 0x, for example -psk 1a2b3c4d. Use the PSK key key when using a PSK cipher suite. The default value is "Client_identity" (without the quotes). Use the PSK identity identity when using a PSK cipher suite. Can be used to override the implicit -ign_eof after -quiet. Shut down the connection when end of file is reached in the input. This implicitly turns on -ign_eof as well. Inhibit printing of session and certificate information. Inhibit shutting down the connection when end of file is reached in the input. This option translated a line feed from the terminal into CR+LF as required by some servers. Show all protocol messages with hex dump. Print extensive debugging information including a hex dump of all traffic. Note: the output produced by this option is not always accurate because a connection might never have been established. This option is useful because the cipher in use may be renegotiated or the connection may fail because a client certificate is required or is requested only after an attempt is made to access a certain URL. Normally information will only be printed out once if the connection succeeds. This will always attempt to print out information even if the connection fails. Print session information when the program exits. showcertsÄisplays the server certificate list as sent by the server: it only consists of certificates the server has sent (in the order the server has sent them). Pauses 1 second between each read and write call. ![]() Reconnects to the same server 5 times using the same session ID, this can be used as a test that session caching is working. Set various certificate chain valiadition option. purpose, -ignore_critical, -issuer_checks, -crl_check, -crl_check_all, -policy_check, -extended_crl, -x509_strict, -policy -check_ss_sig -no_alt_chains CAfile fileĪ file containing trusted certificates to use during server authentication and to use when attempting to build the client certificate chain. These are also used when building the client certificate chain. This directory must be in "hash format", see verify for more information. The directory to use for server certificate verification. ![]() This will typically abort the handshake with a fatal error. Return verification errors instead of continuing. As a side effect the connection will never fail due to a server certificate verify failure. Currently the verify operation continues after errors so all the problems with a certificate chain can be seen. This specifies the maximum length of the server certificate chain and turns on server certificate verification. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl(1). If not specified then the certificate file will be used. The certificate format to use: DER or PEM. The certificate to use, if one is requested by the server. Set the TLS SNI (Server Name Indication) extension in the ClientHello message. If not specified 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 using SSL/TLS. Openssl-s_client, s_client - SSL/TLS client program SYNOPSIS ![]()
0 Comments
Leave a Reply. |