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shishi_realm_for_server_dns(3)      shishi      shishi_realm_for_server_dns(3)


NAME

       shishi_realm_for_server_dns - API function


SYNOPSIS

       #include <shishi.h>

       char * shishi_realm_for_server_dns(Shishi * handle, char * server);


ARGUMENTS

       Shishi * handle
                   Shishi library handle create by shishi_init().

       char * server
                   hostname to find realm for.


DESCRIPTION

       Find realm for a host using DNS lookups, according to
       draft-ietf-krb-wg-krb-dns-locate-03.txt.  Since DNS lookups may be
       spoofed, relying on the realm information may result in a redirection
       attack.  In a single-realm scenario, this only achieves a denial of
       service, but with cross-realm trust it may redirect you to a
       compromised realm.  For this reason, Shishi prints a warning,
       suggesting that the user should add the proper 'server-realm'
       configuration tokens instead.

       To illustrate the DNS information used, here is an extract from a zone
       file for the domain ASDF.COM:

       _kerberos.asdf.com.             IN      TXT     "ASDF.COM"
       _kerberos.mrkserver.asdf.com.   IN      TXT     "MARKETING.ASDF.COM"
       _kerberos.salesserver.asdf.com. IN      TXT     "SALES.ASDF.COM"

       Let us suppose that in this case, a client wishes to use a service on
       the host foo.asdf.com.  It would first query:

       _kerberos.foo.asdf.com. IN TXT

       Finding no match, it would then query:

       _kerberos.asdf.com. IN TXT


RETURN VALUE

       Returns realm for host, or NULL if not found.


REPORTING BUGS

       Report bugs to <bug-shishi@gnu.org>.


COPYRIGHT

       Copyright (C) 2002-2010 Simon Josefsson.
       Copying and distribution of this file, with or without modification,
       are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.


SEE ALSO

       The full documentation for shishi is maintained as a Texinfo manual.
       If the info and shishi programs are properly installed at your site,
       the command

              info shishi

       should give you access to the complete manual.

shishi                               1.0.2      shishi_realm_for_server_dns(3)

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