not accepting username with @

[GoogleCodeExporter]

I set up pwauth with mod_authnz_external
and it works fine pulling id's from pam_mysql using a pretty standard setup and 
restricting users to the web group.

root@marvin:~# cat /etc/pam.d/pwauth
auth    required    pam_succeed_if.so quiet_success user ingroup web
auth    sufficient  pam_mysql.so \
  user=nss-shadow \
  passwd=secret \
  db=nss_mysql \
  table=user \
  usercolumn=user_name \
  passwdcolumn=password \
  crypt=1 \
  verbose=0
auth    requisite   pam_deny.so
auth    required    pam_permit.so
account sufficient  pam_mysql.so \
  user=nss-shadow \
  passwd=secret \
  db=nss_mysql \
  table=user \
  usercolumn=user_name \
  passwdcolumn=password \
  crypt=1 \
  verbose=0
account requisite   pam_deny.so
account required    pam_permit.so

root@marvin:~# pwauth
arjag
secret
root@marvin:~# echo $?
0

Ok, so all good.

If i adjust the file;
root@marvin:~# cat /etc/pam.d/pwauth
# group checking removed for testing
# auth    required    pam_succeed_if.so quiet_success user ingroup web
auth    sufficient  pam_mysql.so \
  user=postfix \
  passwd=secret \
  host=localhost \
  db=postfix \
  table=mailbox \
  usercolumn=username \
  passwdcolumn=password \
  crypt=1 \
  md5=1 \
  verbose=0
auth    sufficient  pam_mysql.so \
  user=nss-shadow \
  passwd=secret \
  db=nss_mysql \
  table=user \
  usercolumn=user_name \
  passwdcolumn=password \
  crypt=1 \
  verbose=0
auth    requisite   pam_deny.so
auth    required    pam_permit.so
account sufficient  pam_mysql.so \
  user=postfix \
  passwd=secret \
  host=localhost \
  db=postfix \
  table=mailbox \
  usercolumn=username \
  passwdcolumn=password \
  crypt=1 \
  md5=1 \
  verbose=0
account sufficient  pam_mysql.so \
  user=nss-shadow \
  passwd=secret \
  db=nss_mysql \
  table=user \
  usercolumn=user_name \
  passwdcolumn=password \
  crypt=1 \
  verbose=0
account requisite   pam_deny.so
account required    pam_permit.so

if I try any of the accounts with "@" in the username (from the postfix 
database) I always get failure;
root@marvin:~# pwauth (this one is just a test to show /etc/init.d/pwauth still 
works)
arjag
secret
root@marvin:~# echo $?
0
root@marvin:~# pwauth
[email protected]
secret
root@marvin:~# echo $?
1
root@marvin:~# pwauth
arjag\@y42.biz
root@marvin:~# echo $?
1

I think this should work as it does not seem to be a pam limitation as on the 
same host I can do;

root@marvin:~# testsaslauthd -u arjag -p secret -f 
/var/spool/postfix/var/run/saslauthd/mux -s pwauth
0: OK "Success."
root@marvin:~# testsaslauthd -u [email protected] -p secret -f 
/var/spool/postfix/var/run/saslauthd/mux -s pwauth
0: OK "Success."

I have set verbose to 1 and it appears pwauth simply refuses to pass on a 
username with @

Thanks for your time, 

R,

Todd

Original issue reported on code.google.com by [email protected] on 27 Apr 2012 at 8:10