KPWVALID(8) AFS Command Reference KPWVALID(8)NAMEkpwvalid - Checks quality of new password
SYNOPSISkpwvalidDESCRIPTION
The kpwvalid command checks the quality of a new password passed to it
from the kpasswd or kas setpassword command for the obsolete
Authentication Server. It is optional. If it exists, it must reside in
the same AFS directory as the binaries for the kpasswd and kas command
suites (create a symbolic link from the client machine's local disk to
this directory). The directory's ACL must extend the "a" (administer)
and "w" (write) permissions to the system:administrators group only.
These requirements prevent unauthorized users from substituting a
spurious kpwvalid binary.
The AFS distribution includes an example kpwvalid program that checks
that the password is at least eight characters long; the code for it
appears in EXAMPLES below.
The script or program must accept a sequence of password strings, one
per line, on the standard input stream. The first is the current
password and is ignored. Each subsequent string is a candidate password
to be checked. The program must write the following to the standard
output stream for each one:
· 0 (zero) and a newline character to indicate that the password is
acceptable.
· A non-zero decimal number and a newline character to indicate that
the password is not acceptable.
Further, it must write any error messages only to the standard error
stream, not to the standard output stream.
CAUTIONS
The kpwvalid command is only used by the obsolete Authentication Server
It is provided for sites that have not yet migrated to a Kerberos
version 5 KDC. The Authentication Server and supporting commands,
including kpwvalid, will be removed in a future version of OpenAFS.
EXAMPLES
The following example program, included in the AFS distribution,
verifies that the requested password includes eight or more characters.
#include <stdio.h>
/* prints 0 if the password is long enough, otherwise non-zero */
main()
{
char oldpassword[512];
char password[512];
if (fgets(oldpassword, 512, stdin))
while (fgets(password, 512, stdin)) {
if (strlen(password) > 8) { /* password includes a newline */
fputs("0\n",stdout);
fflush(stdout);
}
else {
fputs("Passwords must contain at least 8 characters.\n",
stderr);
fputs("1\n",stdout);
fflush(stdout);
}
return 0;
}
SEE ALSOkas_setpassword(8), kpasswd(1)COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0.
It was converted from HTML to POD by software written by Chas Williams
and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2013-10-09 KPWVALID(8)
