<para>
In addition to the method-specific options listed below, there is one
method-independent authentication option <literal>clientcert</literal>, which
- can be specified in any <literal>hostssl</literal> record. When set
- to <literal>1</literal>, this option requires the client to present a valid
- (trusted) SSL certificate, in addition to the other requirements of the
- authentication method.
+ can be specified in any <literal>hostssl</literal> record.
+ This option can be set to <literal>verify-ca</literal> or
+ <literal>verify-full</literal>. Both options require the client
+ to present a valid (trusted) SSL certificate, while
+ <literal>verify-full</literal> additionally enforces that the
+ <literal>cn</literal> (Common Name) in the certificate matches
+ the username or an applicable mapping.
+ This behavior is similar to the cert authentication method
+ (see <xref linkend="auth-cert"/> ) but enables pairing
+ the verification of client certificates with any authentication
+ method that supports <literal>hostssl</literal> entries.
</para>
</listitem>
</varlistentry>
<para>
In a <filename>pg_hba.conf</filename> record specifying certificate
authentication, the authentication option <literal>clientcert</literal> is
- assumed to be <literal>1</literal>, and it cannot be turned off since a client
- certificate is necessary for this method. What the <literal>cert</literal>
- method adds to the basic <literal>clientcert</literal> certificate validity test
- is a check that the <literal>cn</literal> attribute matches the database
- user name.
+ assumed to be <literal>verify-ca</literal> or <literal>verify-full</literal>,
+ and it cannot be turned off since a client certificate is necessary for this
+ method. What the <literal>cert</literal> method adds to the basic
+ <literal>clientcert</literal> certificate validity test is a check that the
+ <literal>cn</literal> attribute matches the database user name.
</para>
</sect1>
(<acronym>CA</acronym>s) you trust in a file in the data
directory, set the parameter <xref linkend="guc-ssl-ca-file"/> in
<filename>postgresql.conf</filename> to the new file name, and add the
- authentication option <literal>clientcert=1</literal> to the appropriate
+ authentication option <literal>clientcert=verify-ca</literal> or
+ <literal>clientcert=verify-full</literal> to the appropriate
<literal>hostssl</literal> line(s) in <filename>pg_hba.conf</filename>.
A certificate will then be requested from the client during SSL
connection startup. (See <xref linkend="libpq-ssl"/> for a description
- of how to set up certificates on the client.) The server will
- verify that the client's certificate is signed by one of the trusted
- certificate authorities.
+ of how to set up certificates on the client.)
+ </para>
+
+ <para>
+ For a <literal>hostssl</literal> entry with
+ <literal>clientcert=verify-ca</literal>, the server will verify
+ that the client's certificate is signed by one of the trusted
+ certificate authorities. If <literal>clientcert=verify-full</literal>
+ is specified, the server will not only verify the certificate
+ chain, but it will also check whether the username or its mapping
+ matches the <literal>cn</literal> (Common Name) of the provided certificate.
+ Note that certificate chain validation is always ensured when the
+ <literal>cert</literal> authentication method is used
+ (see <xref linkend="auth-cert"/>).
</para>
<para>
The <literal>clientcert</literal> authentication option is available for
all authentication methods, but only in <filename>pg_hba.conf</filename> lines
specified as <literal>hostssl</literal>. When <literal>clientcert</literal> is
- not specified or is set to 0, the server will still verify any presented
- client certificates against its CA file, if one is configured — but
- it will not insist that a client certificate be presented.
+ not specified or is set to <literal>no-verify</literal>, the server will still
+ verify any presented client certificates against its CA file, if one is
+ configured — but it will not insist that a client certificate be presented.
+ </para>
+
+ <para>
+ There are two approaches to enforce that users provide a certificate during login.
+ </para>
+
+ <para>
+ The first approach makes use of the <literal>cert</literal> authentication
+ method for <literal>hostssl</literal> entries in <filename>pg_hba.conf</filename>,
+ such that the certificate itself is used for authentication while also
+ providing ssl connection security. See <xref linkend="auth-cert"/> for details.
+ (It is not necessary to specify any <literal>clientcert</literal> options
+ explicitly when using the <literal>cert</literal> authentication method.)
+ In this case, the <literal>cn</literal> (Common Name) provided in
+ the certificate is checked against the user name or an applicable mapping.
</para>
<para>
- If you are setting up client certificates, you may wish to use
- the <literal>cert</literal> authentication method, so that the certificates
- control user authentication as well as providing connection security.
- See <xref linkend="auth-cert"/> for details. (It is not necessary to
- specify <literal>clientcert=1</literal> explicitly when using
- the <literal>cert</literal> authentication method.)
+ The second approach combines any authentication method for <literal>hostssl</literal>
+ entries with the verification of client certificates by setting the
+ <literal>clientcert</literal> authentication option to <literal>verify-ca</literal>
+ or <literal>verify-full</literal>. The former option only enforces that
+ the certificate is valid, while the latter also ensures that the
+ <literal>cn</literal> (Common Name) in the certificate matches
+ the user name or an applicable mapping.
</para>
</sect2>
* current connection, so perform any verifications based on the hba
* options field that should be done *before* the authentication here.
*/
- if (port->hba->clientcert)
+ if (port->hba->clientcert != clientCertOff)
{
/* If we haven't loaded a root certificate store, fail */
if (!secure_loaded_verify_locations())
status = CheckLDAPAuth(port);
#else
Assert(false);
-#endif
- break;
-
- case uaCert:
-#ifdef USE_SSL
- status = CheckCertAuth(port);
-#else
- Assert(false);
#endif
break;
case uaRADIUS:
status = CheckRADIUSAuth(port);
break;
+ case uaCert:
+ /* uaCert will be treated as if clientcert=verify-full (uaTrust) */
case uaTrust:
status = STATUS_OK;
break;
}
+ if ((status == STATUS_OK && port->hba->clientcert == clientCertFull)
+ || port->hba->auth_method == uaCert)
+ {
+ /*
+ * Make sure we only check the certificate if we use the cert method
+ * or verify-full option.
+ */
+#ifdef USE_SSL
+ status = CheckCertAuth(port);
+#else
+ Assert(false);
+#endif
+ }
+
if (ClientAuthentication_hook)
(*ClientAuthentication_hook) (port, status);
static int
CheckCertAuth(Port *port)
{
+ int status_check_usermap = STATUS_ERROR;
+
Assert(port->ssl);
/* Make sure we have received a username in the certificate */
return STATUS_ERROR;
}
- /* Just pass the certificate CN to the usermap check */
- return check_usermap(port->hba->usermap, port->user_name, port->peer_cn, false);
+ /* Just pass the certificate cn to the usermap check */
+ status_check_usermap = check_usermap(port->hba->usermap, port->user_name, port->peer_cn, false);
+ if (status_check_usermap != STATUS_OK)
+ {
+ /*
+ * If clientcert=verify-full was specified and the authentication
+ * method is other than uaCert, log the reason for rejecting the
+ * authentication.
+ */
+ if (port->hba->clientcert == clientCertFull && port->hba->auth_method != uaCert)
+ {
+ ereport(LOG,
+ (errmsg("certificate validation (clientcert=verify-full) failed for user \"%s\": cn mismatch",
+ port->user_name)));
+ }
+ }
+ return status_check_usermap;
}
#endif
*/
if (parsedline->auth_method == uaCert)
{
- parsedline->clientcert = true;
+ parsedline->clientcert = clientCertCA;
}
return parsedline;
*err_msg = "clientcert can only be configured for \"hostssl\" rows";
return false;
}
- if (strcmp(val, "1") == 0)
+ if (strcmp(val, "1") == 0
+ || strcmp(val, "verify-ca") == 0)
{
- hbaline->clientcert = true;
+ hbaline->clientcert = clientCertCA;
}
- else
+ else if (strcmp(val, "verify-full") == 0)
+ {
+ hbaline->clientcert = clientCertFull;
+ }
+ else if (strcmp(val, "0") == 0
+ || strcmp(val, "no-verify") == 0)
{
if (hbaline->auth_method == uaCert)
{
ereport(elevel,
(errcode(ERRCODE_CONFIG_FILE_ERROR),
- errmsg("clientcert can not be set to 0 when using \"cert\" authentication"),
+ errmsg("clientcert can not be set to \"no-verify\" when using \"cert\" authentication"),
errcontext("line %d of configuration file \"%s\"",
line_num, HbaFileName)));
- *err_msg = "clientcert can not be set to 0 when using \"cert\" authentication";
+ *err_msg = "clientcert can not be set to \"no-verify\" when using \"cert\" authentication";
return false;
}
- hbaline->clientcert = false;
+ hbaline->clientcert = clientCertOff;
+ }
+ else
+ {
+ ereport(elevel,
+ (errcode(ERRCODE_CONFIG_FILE_ERROR),
+ errmsg("invalid value for clientcert: \"%s\"", val),
+ errcontext("line %d of configuration file \"%s\"",
+ line_num, HbaFileName)));
+ return false;
}
}
else if (strcmp(name, "pamservice") == 0)
options[noptions++] =
CStringGetTextDatum(psprintf("map=%s", hba->usermap));
- if (hba->clientcert)
+ if (hba->clientcert != clientCertOff)
options[noptions++] =
- CStringGetTextDatum("clientcert=true");
+ CStringGetTextDatum(psprintf("clientcert=%s", (hba->clientcert == clientCertCA) ? "verify-ca" : "verify-full"));
if (hba->pamservice)
options[noptions++] =
ctHostNoSSL
} ConnType;
+typedef enum ClientCertMode
+{
+ clientCertOff,
+ clientCertCA,
+ clientCertFull
+} ClientCertMode;
+
typedef struct HbaLine
{
int linenumber;
int ldapscope;
char *ldapprefix;
char *ldapsuffix;
- bool clientcert;
+ ClientCertMode clientcert;
char *krb_realm;
bool include_realm;
bool compat_realm;
if ($ENV{with_openssl} eq 'yes')
{
- plan tests => 71;
+ plan tests => 75;
}
else
{
qr/SSL error/,
"certificate authorization fails with revoked client cert");
+# Check that connecting with auth-option verify-full in pg_hba:
+# works, iff username matches Common Name
+# fails, iff username doesn't match Common Name.
+$common_connstr =
+"sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+
+test_connect_ok($common_connstr,
+ "user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+ "auth_option clientcert=verify-full succeeds with matching username and Common Name");
+
+test_connect_fails($common_connstr,
+ "user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+ qr/FATAL/,
+ "auth_option clientcert=verify-full fails with mismatching username and Common Name");
+
+# Check that connecting with auth-optionverify-ca in pg_hba :
+# works, when username doesn't match Common Name
+test_connect_ok($common_connstr,
+ "user=yetanotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+ "auth_option clientcert=verify-ca succeeds with mismatching username and Common Name");
+
# intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
switch_server_cert($node, 'server-cn-only', 'root_ca');
$common_connstr =
# Create test users and databases
$node->psql('postgres', "CREATE USER ssltestuser");
$node->psql('postgres', "CREATE USER anotheruser");
+ $node->psql('postgres', "CREATE USER yetanotheruser");
$node->psql('postgres', "CREATE DATABASE trustdb");
$node->psql('postgres', "CREATE DATABASE certdb");
+ $node->psql('postgres', "CREATE DATABASE verifydb");
# Update password of each user as needed.
if (defined($password))
# When connecting to certdb, also check the client certificate.
open my $hba, '>', "$pgdata/pg_hba.conf";
print $hba
- "# TYPE DATABASE USER ADDRESS METHOD\n";
+ "# TYPE DATABASE USER ADDRESS METHOD OPTIONS\n";
print $hba
"hostssl trustdb all $serverhost/32 $authmethod\n";
print $hba
"hostssl trustdb all ::1/128 $authmethod\n";
+ print $hba
+ "hostssl verifydb ssltestuser $serverhost/32 $authmethod clientcert=verify-full\n";
+ print $hba
+ "hostssl verifydb anotheruser $serverhost/32 $authmethod clientcert=verify-full\n";
+ print $hba
+ "hostssl verifydb yetanotheruser $serverhost/32 $authmethod clientcert=verify-ca\n";
print $hba
"hostssl certdb all $serverhost/32 cert\n";
print $hba
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