gnutls-cli(1)

NAME
gnutls-cli - GnuTLS test client

SYNOPSIS
gnutls-cli [options] hostname

DESCRIPTION
Simple client program to set up a TLS connection to some other computer. It sets up a TLS connection and forwards data from the standard input to the secured socket and vice versa.

OPTIONS

  Program control options

-d, --debug LEVEL
    Specify the debug level. Default is 1.

-h, --help
    Prints a short reminder of the command line options.

-l, --list
    Print a list of the supported algorithms and modes.

-r, --resume
    Connect, establish a session. Connect again and resume this session.

-s, --starttls
    Connect, establish a plain session and start TLS when EOF or a SIGALRM is received.

-v, --version
    Prints the program's version number.

-V, --verbose
    More verbose output.

  TLS/SSL control options

--priority PRIORITY STRING
    TLS algorithms and protocols to enable. Unless the first keyword is "NONE" the defaults are:

    Protocols: TLS1.1, TLS1.0, and SSL3.0.

    Compression: NULL.

    Certificate types: X.509, OpenPGP.

    Signature algorithms: RSA-SHA1, RSA-MD2, RSA-MD5, RSA-SHA256, RSA-SHA512, DSA-SHA1.

    You can also use predefined sets of ciphersuites such as:

    PERFORMANCE all the "secure" ciphersuites are enabled, limited to 128 bit ciphers and sorted by terms of speed performance.

    NORMAL option enables all "secure" ciphersuites. The 256-bit ciphers are included as a fallback only. The ciphers are sorted by security margin.

    SECURE128 flag enables all "secure" ciphersuites with ciphers up to 128 bits, sorted by security margin.

    SECURE256 flag enables all "secure" ciphersuites including the 256 bit ciphers, sorted by security margin.

    EXPORT all the ciphersuites are enabled, including the low-security 40 bit ciphers.

    NONE nothing is enabled. This disables even protocols and compression methods.

    Special keywords:

    "!" or "-" appended with an algorithm will remove this algorithm.

    "+" appended with an algorithm will add this algorithm.

    "%COMPAT" will enable compatibility features for a server.

    "%SSL3_RECORD_VERSION" force SSL3.0 record version in the first client hello. This is to avoid buggy servers from terminating connection.

    "%UNSAFE_RENEGOTIATION" Permits (re-)handshakes even unsafe ones.

    "%PARTIAL_RENEGOTIATION" Prevents renegotiation with clients and servers not supporting the safe renegotiation extension. (default)

    "%SAFE_RENEGOTIATION" will enable safe renegotiation. This is the most secure and recommended option for clients. However this will prevent from connecting to legacy servers.

    To avoid collisions in order to specify a compression algorithm in this string you have to prefix it with "COMP-", protocol versions with "VERS-" and certificate types with "CTYPE-". All other algorithms don't need a prefix.

    Examples:

    "NORMAL"

    "NORMAL:%COMPAT"

    "NORMAL:!AES-128-CBC"

    "NONE:+VERS-TLS1.0:+AES-128-CBC:+RSA:+SHA1:+COMP-NULL"

--crlf
    Send CR LF instead of LF.

-f, --fingerprint
    Send the openpgp fingerprint, instead of the key.

-p, --port integer
    The port to connect to.

--ciphers cipher1 cipher2...
    Ciphers to enable (use gnutls-cli --list to show the supported ciphers).

--protocols protocol1 protocol2...
    Protocols to enable (use gnutls-cli --list to show the supported protocols).

--comp comp1 comp2...
    Compression methods to enable (use gnutls-cli --list to show the supported methods).

--macs mac1 mac2...
    MACs to enable (use gnutls-cli --list to show the supported MACs).

--kx kx1 kx2...
    Key exchange methods to enable (use gnutls-cli --list to show the supported methods).

--ctypes certType1 certType2...
    Certificate types to enable (use gnutls-cli --list to show the supported types).

--recordsize integer
    The maximum record size to advertize.

--disable-extensions
    Disable all the TLS extensions.

--print-cert
    Print the certificate in PEM format.

--insecure
    Don't abort program if server certificates can't be validated.

  Certificate options

--pgpcertfile FILE
    PGP Public Key (certificate) file to use.

--pgpkeyfile FILE
    PGP Key file to use.

--pgpkeyring FILE
    PGP Key ring file to use.

--pgptrustdb FILE
    PGP trustdb file to use.

--pgpsubkey HEX|auto2
    PGP subkey to use.

--srppasswd PASSWD
    SRP password to use.

--srpusername NAME
    SRP username to use.

--x509cafile FILE
    Certificate file to use.

--x509certfile FILE
    X.509 Certificate file to use.

--x509fmtder
    Use DER format for certificates

--x509keyfile FILE
    X.509 key file to use.

--x509crlfile FILE
    X.509 CRL file to use.

--pskusername NAME
    PSK username to use.

--pskkey KEY
    PSK key (in hex) to use.

--opaque-prf-input DATA
    Use Opaque PRF Input DATA.

SEE ALSO
gnutls-cli-debug(1), gnutls-serv(1)

AUTHOR

Nikos Mavroyanopoulos <nmav@gnutls.org> and others; see /usr/share/doc/gnutls-bin/AUTHORS for a complete list.

This manual page was written by Ivo Timmermans <ivo@debian.org>, for the Debian GNU/Linux system (but may be used by others).