diff -up openssh-5.9p1/auth.h.2auth openssh-5.9p1/auth.h

--- openssh-5.9p1/auth.h.2auth	2011-05-29 13:39:38.000000000 +0200

+++ openssh-5.9p1/auth.h	2011-09-17 11:36:54.314522599 +0200

@@ -149,6 +149,8 @@ int	auth_root_allowed(char *);

 char	*auth2_read_banner(void);

+void	userauth_restart(const char *);

+

 void	privsep_challenge_enable(void);

 int	auth2_challenge(Authctxt *, char *);

diff -up openssh-5.9p1/auth2.c.2auth openssh-5.9p1/auth2.c

--- openssh-5.9p1/auth2.c.2auth	2011-05-05 06:04:11.000000000 +0200

+++ openssh-5.9p1/auth2.c	2011-09-17 11:36:54.402521709 +0200

@@ -290,6 +290,24 @@ input_userauth_request(int type, u_int32

 }

 void

+userauth_restart(const char *method)

+{

+	options.two_factor_authentication = 0;

+

+	debug2("userauth restart, method = %s", method);

+	options.pubkey_authentication = options.second_pubkey_authentication && strcmp(method, method_pubkey.name);

+#ifdef GSSAPI

+	options.gss_authentication = options.second_gss_authentication && strcmp(method, method_gssapi.name);

+#endif

+#ifdef JPAKE

+	options.zero_knowledge_password_authentication = options.second_zero_knowledge_password_authentication && strcmp(method, method_jpake.name);

+#endif

+	options.password_authentication = options.second_password_authentication && strcmp(method, method_passwd.name);

+	options.kbd_interactive_authentication = options.second_kbd_interactive_authentication && strcmp(method, method_kbdint.name);

+	options.hostbased_authentication = options.second_hostbased_authentication && strcmp(method, method_hostbased.name);

+}

+

+void

 userauth_finish(Authctxt *authctxt, int authenticated, char *method)

 {

 	char *methods;

@@ -337,6 +355,12 @@ userauth_finish(Authctxt *authctxt, int

 	/* XXX todo: check if multiple auth methods are needed */

 	if (authenticated == 1) {

+		if (options.two_factor_authentication) {

+			userauth_restart(method);

+			debug("1st factor authentication done go to 2nd factor");

+			goto ask_methods;

+		}

+

 		/* turn off userauth */

 		dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);

 		packet_start(SSH2_MSG_USERAUTH_SUCCESS);

@@ -356,7 +380,9 @@ userauth_finish(Authctxt *authctxt, int

 #endif

 			packet_disconnect(AUTH_FAIL_MSG, authctxt->user);

 		}

+ask_methods:

 		methods = authmethods_get();

+		debug2("next auth methods = %s", methods);

 		packet_start(SSH2_MSG_USERAUTH_FAILURE);

 		packet_put_cstring(methods);

 		packet_put_char(0);	/* XXX partial success, unused */

diff -up openssh-5.9p1/monitor.c.2auth openssh-5.9p1/monitor.c

--- openssh-5.9p1/monitor.c.2auth	2011-08-05 22:15:18.000000000 +0200

+++ openssh-5.9p1/monitor.c	2011-09-17 11:36:54.513491937 +0200

@@ -417,6 +417,10 @@ monitor_child_preauth(Authctxt *_authctx

 			}

 		}

 #endif

+		if (authenticated && options.two_factor_authentication) {

+			userauth_restart(auth_method);

+			authenticated = 0;

+		}

 	}

 	/* Drain any buffered messages from the child */

diff -up openssh-5.9p1/servconf.c.2auth openssh-5.9p1/servconf.c

--- openssh-5.9p1/servconf.c.2auth	2011-06-23 00:30:03.000000000 +0200

+++ openssh-5.9p1/servconf.c	2011-09-17 11:36:54.632461730 +0200

@@ -92,6 +92,13 @@ initialize_server_options(ServerOptions

 	options->hostbased_uses_name_from_packet_only = -1;

 	options->rsa_authentication = -1;

 	options->pubkey_authentication = -1;

+	options->two_factor_authentication = -1;

+	options->second_pubkey_authentication = -1;

+	options->second_gss_authentication = -1;

+	options->second_password_authentication = -1;

+	options->second_kbd_interactive_authentication = -1;

+	options->second_zero_knowledge_password_authentication = -1;

+	options->second_hostbased_authentication = -1;

 	options->kerberos_authentication = -1;

 	options->kerberos_or_local_passwd = -1;

 	options->kerberos_ticket_cleanup = -1;

@@ -237,6 +244,20 @@ fill_default_server_options(ServerOption

 		options->permit_empty_passwd = 0;

 	if (options->permit_user_env == -1)

 		options->permit_user_env = 0;

+	if (options->two_factor_authentication == -1)

+		options->two_factor_authentication = 0;

+	if (options->second_pubkey_authentication == -1)

+		options->second_pubkey_authentication = 1;

+	if (options->second_gss_authentication == -1)

+		options->second_gss_authentication = 0;

+	if (options->second_password_authentication == -1)

+		options->second_password_authentication = 1;

+	if (options->second_kbd_interactive_authentication == -1)

+		options->second_kbd_interactive_authentication = 0;

+	if (options->second_zero_knowledge_password_authentication == -1)

+		options->second_zero_knowledge_password_authentication = 0;

+	if (options->second_hostbased_authentication == -1)

+		options->second_hostbased_authentication = 0;

 	if (options->use_login == -1)

 		options->use_login = 0;

 	if (options->compression == -1)

@@ -316,8 +337,11 @@ typedef enum {

 	sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,

 	sMaxStartups, sMaxAuthTries, sMaxSessions,

 	sBanner, sUseDNS, sHostbasedAuthentication,

-	sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,

-	sClientAliveCountMax, sAuthorizedKeysFile,

+	sHostbasedUsesNameFromPacketOnly, sTwoFactorAuthentication,

+	sSecondPubkeyAuthentication, sSecondGssAuthentication,

+	sSecondPasswordAuthentication, sSecondKbdInteractiveAuthentication,

+	sSecondZeroKnowledgePasswordAuthentication, sSecondHostbasedAuthentication,

+	sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,

 	sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,

 	sMatch, sPermitOpen, sForceCommand, sChrootDirectory,

 	sUsePrivilegeSeparation, sAllowAgentForwarding,

@@ -395,6 +419,21 @@ static struct {

 #else

 	{ "zeroknowledgepasswordauthentication", sUnsupported, SSHCFG_ALL },

 #endif

+	{ "twofactorauthentication", sTwoFactorAuthentication, SSHCFG_ALL },

+	{ "secondpubkeyauthentication", sSecondPubkeyAuthentication, SSHCFG_ALL },

+#ifdef GSSAPI

+	{ "secondgssapiauthentication", sSecondGssAuthentication, SSHCFG_ALL },

+#else

+	{ "secondgssapiauthentication", sUnsupported, SSHCFG_ALL },

+#endif

+	{ "secondpasswordauthentication", sSecondPasswordAuthentication, SSHCFG_ALL },

+	{ "secondkbdinteractiveauthentication", sSecondKbdInteractiveAuthentication, SSHCFG_ALL },

+#ifdef JPAKE

+	{ "secondzeroknowledgepasswordauthentication", sSecondZeroKnowledgePasswordAuthentication, SSHCFG_ALL },

+#else

+	{ "secondzeroknowledgepasswordauthentication", sUnsupported, SSHCFG_ALL },

+#endif

+	{ "secondhostbasedauthentication", sSecondHostbasedAuthentication, SSHCFG_ALL },

 	{ "checkmail", sDeprecated, SSHCFG_GLOBAL },

 	{ "listenaddress", sListenAddress, SSHCFG_GLOBAL },

 	{ "addressfamily", sAddressFamily, SSHCFG_GLOBAL },

@@ -982,6 +1021,34 @@ process_server_config_line(ServerOptions

 		intptr = &options->challenge_response_authentication;

 		goto parse_flag;

+	case sTwoFactorAuthentication:

+		intptr = &options->two_factor_authentication;

+		goto parse_flag;

+

+	case sSecondPubkeyAuthentication:

+		intptr = &options->second_pubkey_authentication;

+		goto parse_flag;

+

+	case sSecondGssAuthentication:

+		intptr = &options->second_gss_authentication;

+		goto parse_flag;

+

+	case sSecondPasswordAuthentication:

+		intptr = &options->second_password_authentication;

+		goto parse_flag;

+

+	case sSecondKbdInteractiveAuthentication:

+		intptr = &options->second_kbd_interactive_authentication;

+		goto parse_flag;

+

+	case sSecondZeroKnowledgePasswordAuthentication:

+		intptr = &options->second_zero_knowledge_password_authentication;

+		goto parse_flag;

+

+	case sSecondHostbasedAuthentication:

+		intptr = &options->second_hostbased_authentication;

+		goto parse_flag;

+

 	case sPrintMotd:

 		intptr = &options->print_motd;

 		goto parse_flag;

@@ -1491,14 +1558,21 @@ void

 copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)

 {

 	M_CP_INTOPT(password_authentication);

+	M_CP_INTOPT(second_password_authentication);

 	M_CP_INTOPT(gss_authentication);

+	M_CP_INTOPT(second_gss_authentication);

 	M_CP_INTOPT(rsa_authentication);

 	M_CP_INTOPT(pubkey_authentication);

+	M_CP_INTOPT(second_pubkey_authentication);

 	M_CP_INTOPT(kerberos_authentication);

 	M_CP_INTOPT(hostbased_authentication);

+	M_CP_INTOPT(second_hostbased_authentication);

 	M_CP_INTOPT(hostbased_uses_name_from_packet_only);

 	M_CP_INTOPT(kbd_interactive_authentication);

+	M_CP_INTOPT(second_kbd_interactive_authentication);

 	M_CP_INTOPT(zero_knowledge_password_authentication);

+	M_CP_INTOPT(second_zero_knowledge_password_authentication);

+	M_CP_INTOPT(two_factor_authentication);

 	M_CP_INTOPT(permit_root_login);

 	M_CP_INTOPT(permit_empty_passwd);

@@ -1720,17 +1794,24 @@ dump_config(ServerOptions *o)

 #endif

 #ifdef GSSAPI

 	dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);

+	dump_cfg_fmtint(sSecondGssAuthentication, o->second_gss_authentication);

 	dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds);

 #endif

 #ifdef JPAKE

 	dump_cfg_fmtint(sZeroKnowledgePasswordAuthentication,

 	    o->zero_knowledge_password_authentication);

+	dump_cfg_fmtint(sSecondZeroKnowledgePasswordAuthentication,

+	    o->second_zero_knowledge_password_authentication);

 #endif

 	dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);

+	dump_cfg_fmtint(sSecondPasswordAuthentication, o->second_password_authentication);

 	dump_cfg_fmtint(sKbdInteractiveAuthentication,

 	    o->kbd_interactive_authentication);

+	dump_cfg_fmtint(sSecondKbdInteractiveAuthentication,

+	    o->second_kbd_interactive_authentication);

 	dump_cfg_fmtint(sChallengeResponseAuthentication,

 	    o->challenge_response_authentication);

+	dump_cfg_fmtint(sTwoFactorAuthentication, o->two_factor_authentication);

 	dump_cfg_fmtint(sPrintMotd, o->print_motd);

 	dump_cfg_fmtint(sPrintLastLog, o->print_lastlog);

 	dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding);

diff -up openssh-5.9p1/servconf.h.2auth openssh-5.9p1/servconf.h

--- openssh-5.9p1/servconf.h.2auth	2011-06-23 00:30:03.000000000 +0200

+++ openssh-5.9p1/servconf.h	2011-09-17 11:36:54.749584245 +0200

@@ -112,6 +112,14 @@ typedef struct {

 					/* If true, permit jpake auth */

 	int     permit_empty_passwd;	/* If false, do not permit empty

 					 * passwords. */

+	int	two_factor_authentication;	/* If true, the first sucessful authentication

+					 * will be followed by the second one from anorher set */

+	int	second_pubkey_authentication;	/* second set of authentications */

+	int	second_gss_authentication;

+	int	second_password_authentication;

+	int	second_kbd_interactive_authentication;

+	int	second_zero_knowledge_password_authentication;

+	int	second_hostbased_authentication;

 	int     permit_user_env;	/* If true, read ~/.ssh/environment */

 	int     use_login;	/* If true, login(1) is used */

 	int     compression;	/* If true, compression is allowed */

diff -up openssh-5.9p1/sshd_config.2auth openssh-5.9p1/sshd_config

--- openssh-5.9p1/sshd_config.2auth	2011-05-29 13:39:39.000000000 +0200

+++ openssh-5.9p1/sshd_config	2011-09-17 11:36:54.859588726 +0200

@@ -87,6 +87,13 @@ AuthorizedKeysFile	.ssh/authorized_keys

 # and ChallengeResponseAuthentication to 'no'.

 #UsePAM no

+#TwoFactorAuthentication no

+#SecondPubkeyAuthentication yes

+#SecondHostbasedAuthentication no

+#SecondPasswordAuthentication yes

+#SecondKBDInteractiveAuthentication yes

+#SecondGSSAPIAuthentication no

+

 #AllowAgentForwarding yes

 #AllowTcpForwarding yes

 #GatewayPorts no

diff -up openssh-5.9p1/sshd_config.5.2auth openssh-5.9p1/sshd_config.5

--- openssh-5.9p1/sshd_config.5.2auth	2011-08-05 22:17:33.000000000 +0200

+++ openssh-5.9p1/sshd_config.5	2011-09-17 13:45:49.022521436 +0200

@@ -726,6 +726,12 @@ Available keywords are

 .Cm PubkeyAuthentication ,

 .Cm RhostsRSAAuthentication ,

 .Cm RSAAuthentication ,

+.Cm SecondGSSAPIAuthentication ,

+.Cm SecondHostbasedAuthentication ,

+.Cm SecondKbdInteractiveAuthentication ,

+.Cm SecondPasswordAuthentication ,

+.Cm SecondPubkeyAuthentication ,

+.Cm TwoFactorAuthentication ,

 .Cm X11DisplayOffset ,

 .Cm X11Forwarding

 and

@@ -931,6 +937,45 @@ Specifies whether pure RSA authenticatio

 The default is

 .Dq yes .

 This option applies to protocol version 1 only.

+.It Cm SecondGSSAPIAuthentication

+Specifies whether the

+.Cm GSSAPIAuthentication

+may be used on the second authentication while

+.Cm TwoFactorAuthentication

+is set.

+The default is

+.Dq no .

+.It Cm SecondHostbasedAuthentication

+Specifies whether the

+.Cm HostbasedAuthentication

+may be used on the second authentication while

+.Cm TwoFactorAuthentication

+is set.

+The default is

+.Dq no .

+.It Cm SecondKbdInteractiveAuthentication

+Specifies whether the

+.Cm KbdInteractiveAuthentication

+may be used on the second authentication while

+.Cm TwoFactorAuthentication

+is set.

+The default is

+.Dq yes .

+.It Cm SecondPasswordAuthentication

+Specifies whether the

+.Cm PasswordAuthentication

+may be used on the second authentication while

+.Cm TwoFactorAuthentication

+is set.

+The default is

+.Dq yes .

+Specifies whether the

+.Cm PubkeyAuthentication

+may be used on the second authentication while

+.Cm TwoFactorAuthentication

+is set.

+The default is

+.Dq yes .

 .It Cm ServerKeyBits

 Defines the number of bits in the ephemeral protocol version 1 server key.

 The minimum value is 512, and the default is 1024.

@@ -1011,6 +1056,23 @@ For more details on certificates, see th

 .Sx CERTIFICATES

 section in

 .Xr ssh-keygen 1 .

+.It Cm TwoFactorAuthentication

+Specifies whether for a successful login is necessary to meet two independent authentications.

+If select the first method is selected from the set of allowed methods from

+.Cm GSSAPIAuthentication ,

+.Cm HostbasedAuthentication ,

+.Cm KbdInteractiveAuthentication ,

+.Cm PasswordAuthentication ,

+.Cm PubkeyAuthentication .

+And the second method is selected from the set of allowed methods from

+.Cm SecondGSSAPIAuthentication ,

+.Cm SecondHostbasedAuthentication ,

+.Cm SecondKbdInteractiveAuthentication ,

+.Cm SecondPasswordAuthentication ,

+.Cm SecondPubkeyAuthentication 

+without the method used for the first authentication.

+The default is

+.Dq no .

 .It Cm UseDNS

 Specifies whether

 .Xr sshd 8