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Track behavior of \1 in pg_ident.conf when quoted

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Entries of pg-user in pg_ident.conf that are quoted and include '\1'
allow a replacement from a subexpression in a system user regexp.  This
commit adds a test to track this behavior and a note in the
documentation, as it could be affected by the use of an AuthToken for
the pg-user in the IdentLines parsed.

This subject has come up in the discussion aimed at extending the
support of pg-user in ident entries for more patterns.

Author: Jelte Fennema
Discussion: https://postgr.es/m/CAGECzQRNow4MwkBjgPxywXdJU_K3a9+Pm78JB7De3yQwwkTDew@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-01-17 13:41:09 +09:00
parent da5800d5fa
commit 0b717432ff
2 changed files with 16 additions and 0 deletions
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doc/src/sgml/client-auth.sgml
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@ -960,6 +960,9 @@ mymap /^(.*)@otherdomain\.com$ guest
will remove the domain part for users with system user names that end with
<literal>@mydomain.com</literal>, and allow any user whose system name ends with
<literal>@otherdomain.com</literal> to log in as <literal>guest</literal>.
Quoting a <replaceable>database-username</replaceable> containing
<literal>\1</literal> <emphasis>does not</emphasis> make
<literal>\1</literal> lose its special meaning.
</para>
<tip>