Re: rndc key for bind 9.3.0. catch-22?

On Mon, 2004-12-06 at 12:47, Christopher L. Barnard wrote:
> I am confused. This is bind 9.3.0.
>
> from the rndc man page:
>
> [...] In the current versions of rndc and named named the
> only supported authentication algorithm is HMAC-MD5 [...]
>
> however, when I try to generate a key
>
> root#> /opt/local/sbin/dnssec-keygen -a hmac-md5 -b 512 -n ZONE cbot.com
> dnssec-keygen: a key with algorithm 'hmac-md5' cannot be a zone key
>
> That dnssec-keygen command worked fine with bind9 prior to version 9.3.0.
> An existing key works fine on a server that has been upgraded to bind
> 9.3.0 from 9.2.3. However a new installation of bind 9.3.0 fails because
> I cannot generate the key for rndc. How do I generate a key for the
> /etc/rndc.conf file with bind version 9.3.0?
>
> +-----------------------------------------------------------------------+
> | Christopher L. Barnard O When I was a boy I was told that |
> | cbarnard@tsg.cbot.com / \ anybody could become president. |
> | (312) 347-4901 O---O Now I'm beginning to believe it. |
> | http://www.cs.uchicago.edu/~cbarnard --Clarence Darrow |
> +----------PGP public key available via finger or PGP keyserver---------+
>
>
You could substitute 'HOST' for 'ZONE' in the dnssec-keygen command, and
then copy the generated key (the last field of the KEY record) from
either the K*.public or K*.private files (removing spaces) into the
'rndc.key' file.

Alternatively, you could use the attached C-program
which generates a usable hmac-md5 key on stdout.
This is used by Red Hat's BIND distribution to generate
the initial rndc.key :

--- BEGIN "keygen.c" C program attachment
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
FILE *f=fopen("/dev/urandom", "r");
char key[61];
int i=0;
char tmp;
memset(key, 0, 61);
while(i<60) {
tmp=fgetc(f);
if((tmp>='a' && tmp<='z') ||
(tmp>='A' && tmp<='Z') ||
(tmp>='0' && tmp<='9'))
key[i++]=tmp;
}
puts(key);
fclose(f);
}
--- END C program attachment

To build:
$ cc -o dns-keygen keygen.c
To Run:
$ ./dns-keygen
vAPjDZR1EYNGjlzufOUU4zLvJvUkRbXbfMrb2t4xWTHyyinapB XWauUxzgrO