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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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13
src/test/authentication/t/003_peer.pl
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@ -153,6 +153,19 @@ test_role(
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Success as the regular expression matches and \1 is replaced in the given
# subexpression, even if quoted.
reset_pg_ident($node, 'mypeermap', qq{/^$system_user(.*)\$},
'"test\1mapuser"');
test_role(
$node,
qq{testmapuser},
'peer',
0,
'with regular expression in user name map with quoted \1 replaced',
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Failure as the regular expression does not include a subexpression, but
# the database user contains \1, requesting a replacement.
reset_pg_ident($node, 'mypeermap', qq{/^$system_user\$}, '\1testmapuser');