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Commit05c4ef6

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Note that sslmode=require verifies the CA if root cert is present
This mode still exists for backwards compatibility, makingsslmode=require the same as sslmode=verify-ca when the file is present,but not causing an error when it isn't.Per bug 6189, reported by Srinivas Aji
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‎doc/src/sgml/libpq.sgml

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@@ -391,7 +391,9 @@ PGconn *PQconnectdbParams(const char **keywords, const char **values, int expand
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<row>
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<entry><literal>require</></entry>
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<entry>only try an <acronym>SSL</> connection</entry>
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<entry>only try an <acronym>SSL</> connection. If a root CA
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file is present, verify the certificate in the same way as
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if <literal>verify-ca</literal> was specified</entry>
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</row>
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<row>
@@ -6512,6 +6514,18 @@ ldap://ldap.acme.com/cn=dbserver,cn=hosts?pgconnectinfo?base?(objectclass=*)
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the connection parameters <literal>sslrootcert</> and <literal>sslcrl</>
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or the environment variables <envar>PGSSLROOTCERT</> and <envar>PGSSLCRL</>.
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</para>
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<note>
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<para>
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For backwards compatibility with earlier versions of PostgreSQL, if a
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root CA file exists, the behavior of
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<literal>sslmode</literal>=<literal>require</literal> will be the same
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as that of <literal>verify-ca</literal>, meaning the sever certificate
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is validated against the CA. Relying on this behavior is discouraged,
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and applications that need certificate validation should always use
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<literal>validate-ca</literal> or <literal>validate-full</literal>.
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</para>
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</note>
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</sect2>
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<sect2 id="libpq-ssl-clientcert">

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