Ubuntu Manpage: ipsec_showhostkey - show host´s authentication key

NAME

       ipsec_showhostkey - show host´s authentication key

SYNOPSIS


       ipsec showhostkey [--ipseckey [gateway]] [--left] [--right] [--dump] [--verbose] [--version] [--list]
             [--x509self] [--x509req] [--x509cert] [--txt gateway] [--dhclient] [--file secretfile]
             [--keynum count] [--id identity]

DESCRIPTION

Showhostkey outputs (on standard output) a public key suitable for this host, in the format specified,
using the host key information stored in /etc/ipsec.secrets. In general only the super-user can run this
command, since only he can read ipsec.secrets.

The --txt option causes the output to be in opportunistic-encryption DNS TXT record format, with the
specified gateway value. If information about how the key was generated is available, that is provided as
a DNS-file comment. For example, --txt 10.11.12.13 might give (with the key data trimmed for clarity):

; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
IN TXT "X-IPsec-Server(10)=10.11.12.13 AQOF8tZ2...+buFuFn/"

No name is supplied in the TXT record because there are too many possibilities, depending on how it will
be used. If the text string is longer than 255 bytes, it is split up into multiple strings (matching the
restrictions of the DNS TXT binary format). If any split is needed, the first split will be at the start
of the key: this increases the chances that later hand editing will work.

The --version option causes the version of the binary to be emitted, and nothing else.

The --verbose may be present one or more times. Each occurance increases the verbosity level.

The --left and --right options cause the output to be in ipsec.conf(5) format, as a leftrsasigkey or
rightrsasigkey parameter respectively. Again, generation information is included if available. For
example, --left might give (with the key data trimmed down for clarity):

# RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
leftrsasigkey=0sAQOF8tZ2...+buFuFn/

The --dhclient option cause the output to be suitable for inclusion in dhclient.conf(5) as part of
configuring WAVEsec. See <http://www.wavesec.org>.

If --ipseckey is specified, the output format is the text form of a DNS IPSECKEY record (see RFC4025);
the host name is the one included in the key information (or, if that is not available, the output of
hostname --fqdn), with a . appended. The gateway information, if provided, is is included, otherwise,
the gateway is assumed to be self, and to be of type FQDN. Generation information is included if
available. For example (with the key data trimmed down for clarity):

; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
xy.example.com. IN IPSECKEYKEY floyd albert

; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
xy.example.com. IN KEY 0x4200 4 1 AQOF8tZ2...+buFuFn/

Normally, the default key for this host (the one with no host identities specified for it) is the one
extracted. The --id option overrides this, causing extraction of the key labeled with the specified
identity, if any. The specified identity must exactly match the identity in the file; in particular, the
comparison is case-sensitive.

There may also be multiple keys with the same identity. All keys are numbered based upon their linear
sequence in the file (including all include directives)

The --file option overrides the default for where the key information should be found, and takes it from
the specified secretfile.

DIAGNOSTICS

       A complaint about “no pubkey line found” indicates that the host has a key but it was generated with an
       old version of FreeS/WAN and does not contain the information that showhostkey needs.

FILES

       /etc/ipsec.secrets

HISTORY

       Written for the Linux FreeS/WAN project <http://www.freeswan.org> by Henry Spencer.

BUGS

       Arguably, rather than just reporting the no-IN-KEY-line-found problem, showhostkey should be smart enough
       to run the existing key through rsasigkey with the --oldkey option, to generate a suitable output line.

       The need to specify the gateway address (etc.) for --txt is annoying, but there is no good way to
       determine it automatically.

       There should be a way to specify the priority value for TXT records; currently it is hardwired to 10.

       The --id option assumes that the identity appears on the same line as the : RSA { that begins the key
       proper.

[FIXME: source]                                    10/06/2010                               IPSEC_SHOWHOSTKEY(8)