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Re: postgresql-7.1.3 pg_ctl password authentication and startup

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Benjamin Yu <benjaminlyu(at)yahoo(dot)com>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: postgresql-7.1.3 pg_ctl password authentication and startup
Date: 2001-10-11 20:34:10
Message-ID: 200110112034.f9BKYAY09565@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
Can I get comments on this?  It allows storage of a super-user password
in a file under /data that gets passed in psql.  I don't like the fact
the password is stored unencrypted but that is needed to pipe into psql.
For 7.2 *BSD, Linux, it would be better to set up local/indent but for
other platforms I can see a use to it.


> The problem:
>  If password authentication is set, then startup
> blocks waiting for a password to be given in stdin.
> 
> System:
>  FreeBSD 4.4
>  postgresql runs under user/group pgsql
>  data directory owned by pgsql
> 
> Workaround:
>  Modified the pg_ctl script to redirect a one line
> password file to "$PGPATH/psql". The passwd file
> exists in the data directory.
> PASSFILE=$PGDATA/postmaster.passwd
>  If the passwd file does not exist, an empty one will
> be created with perm 600.
> 
> Security:
>  If someone has root or pgsql os user access, then
> they
> can alter the data directory at will anyways. Putting
> a plaintext passwd file in the data directory that
> regular users cannot access anyways does not represent
> any more of a security hazard that if someone had
> access to the master.passwd files.
>  Workaround a bit more secure than allowing trust to
> all local users.
>  
> --- pg_ctl.sh   Sat Apr 21 04:23:58 2001
> +++ /usr/local/bin/pg_ctl       Sat Sep 22 12:39:03
> 2001
> @@ -56,8 +56,8 @@
>  
>  
>  # Placed here during build
> -bindir='@bindir@'
> -VERSION='@VERSION@'
> +bindir='/usr/local/bin'
> +VERSION='7.1.3'
>  
>  # protect the log file
>  umask 077
> @@ -226,6 +226,11 @@
>  DEFPOSTOPTS=$PGDATA/postmaster.opts.default
>  POSTOPTSFILE=$PGDATA/postmaster.opts
>  PIDFILE=$PGDATA/postmaster.pid
> +PASSFILE=$PGDATA/postmaster.passwd
> +if [ ! -e $PASSFILE ];then
> +       touch $PASSFILE
> +       chmod 600 $PASSFILE
> +fi
>  
>  if [ $op = "status" ];then
>      if [ -f $PIDFILE ];then
> @@ -347,6 +352,10 @@
>         do
>  # FIXME:  This is horribly misconceived.
>  # 1) If password authentication is set up, the
> connection will fail.
> +#      Kinda fixed. If password is set up, and the
> $PASSFILE
> +#      does not exist, then it will fail. If password
> is setup
> +#      and passwd file exists with the passwd, then
> it will succeed.
> +#      If password auth is not set, this will still
> work.
>  # 2) If a virtual host is set up, the connection may
> fail.
>  # 3) If network traffic filters are set up tight
> enough, the connection
>  #    may fail.
> @@ -357,7 +366,7 @@
>  # 6) If the dynamic loader is not set up correctly
> (for this user/at
>  #    this time), psql will fail (to find libpq).
>  # 7) If psql is misconfigured, this may fail.
> -           if "$PGPATH/psql" -l >/dev/null 2>&1
> +           if "$PGPATH/psql" -l >/dev/null 2>&1 <
> $PASSFILE
>             then
>                 break;
>             else
> 
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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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Subject: psql: default base and password reading
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Subject: Re: SQLCODE==-209

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