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-rw-r--r--doc/src/sgml/libpq.sgml16
1 files changed, 15 insertions, 1 deletions
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 7fc8a5775b..702ad888f5 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -304,7 +304,9 @@
<row>
<entry><literal>require</></entry>
- <entry>only try an <acronym>SSL</> connection</entry>
+ <entry>only try an <acronym>SSL</> connection. If a root CA
+ file is present, verify the certificate in the same way as
+ if <literal>verify-ca</literal> was specified</entry>
</row>
<row>
@@ -6197,6 +6199,18 @@ myEventProc(PGEventId evtId, void *evtInfo, void *passThrough)
by the connection parameters <literal>sslrootcert</> and <literal>sslcrl</>
or the environment variables <envar>PGSSLROOTCERT</> and <envar>PGSSLCRL</>.
</para>
+
+ <note>
+ <para>
+ For backwards compatibility with earlier versions of PostgreSQL, if a
+ root CA file exists, the behavior of
+ <literal>sslmode</literal>=<literal>require</literal> will be the same
+ as that of <literal>verify-ca</literal>, meaning the sever certificate
+ is validated against the CA. Relying on this behavior is discouraged,
+ and applications that need certificate validation should always use
+ <literal>validate-ca</literal> or <literal>validate-full</literal>.
+ </para>
+ </note>
</sect2>
<sect2 id="libpq-ssl-clientcert">