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>dblink_connect_u</H1
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><H2
>Name</H2
>dblink_connect_u -- opens a persistent connection to a remote database, insecurely</DIV
><DIV
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><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>dblink_connect_u(text connstr) returns text
dblink_connect_u(text connname, text connstr) returns text</PRE
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>Description</H2
><P
> <CODE
CLASS="FUNCTION"
>dblink_connect_u()</CODE
> is identical to
<CODE
CLASS="FUNCTION"
>dblink_connect()</CODE
>, except that it will allow non-superusers
to connect using any authentication method.
</P
><P
> If the remote server selects an authentication method that does not
involve a password, then impersonation and subsequent escalation of
privileges can occur, because the session will appear to have
originated from the user as which the local <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
server runs. Also, even if the remote server does demand a password,
it is possible for the password to be supplied from the server
environment, such as a <TT
CLASS="FILENAME"
>~/.pgpass</TT
> file belonging to the
server's user. This opens not only a risk of impersonation, but the
possibility of exposing a password to an untrustworthy remote server.
Therefore, <CODE
CLASS="FUNCTION"
>dblink_connect_u()</CODE
> is initially
installed with all privileges revoked from <TT
CLASS="LITERAL"
>PUBLIC</TT
>,
making it un-callable except by superusers. In some situations
it may be appropriate to grant <TT
CLASS="LITERAL"
>EXECUTE</TT
> permission for
<CODE
CLASS="FUNCTION"
>dblink_connect_u()</CODE
> to specific users who are considered
trustworthy, but this should be done with care. It is also recommended
that any <TT
CLASS="FILENAME"
>~/.pgpass</TT
> file belonging to the server's user
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>not</I
></SPAN
> contain any records specifying a wildcard host name.
</P
><P
> For further details see <CODE
CLASS="FUNCTION"
>dblink_connect()</CODE
>.
</P
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