diff -u -N --exclude configure --exclude config.h.in src.old/Makefile.in src/Makefile.in
--- src.old/Makefile.in	Sat Jan 11 17:08:23 2003
+++ src/Makefile.in	Sat Jan 11 17:08:17 2003
@@ -60,11 +60,11 @@
 
 TARGETS=ssh$(EXEEXT) sshd$(EXEEXT) ssh-add$(EXEEXT) ssh-keygen$(EXEEXT) ssh-keyscan${EXEEXT} ssh-keysign${EXEEXT} ssh-agent$(EXEEXT) scp$(EXEEXT) ssh-rand-helper${EXEEXT} $(SFTP_PROGS)
 
-LIBSSH_OBJS=atomicio.o authfd.o authfile.o bufaux.o buffer.o canohost.o channels.o cipher.o compat.o compress.o crc32.o deattack.o dh.o dispatch.o fatal.o mac.o msg.o hostfile.o key.o kex.o kexdh.o kexgex.o log.o match.o misc.o mpaux.o nchan.o packet.o radix.o rijndael.o entropy.o readpass.o rsa.o scard.o scard-opensc.o ssh-dss.o ssh-rsa.o tildexpand.o ttymodes.o uidswap.o uuencode.o xmalloc.o monitor_wrap.o monitor_fdpass.o
+LIBSSH_OBJS=atomicio.o authfd.o authfile.o bufaux.o buffer.o canohost.o channels.o cipher.o compat.o compress.o crc32.o deattack.o dh.o dispatch.o fatal.o mac.o msg.o hostfile.o key.o kex.o kexdh.o kexgex.o log.o match.o misc.o mpaux.o nchan.o packet.o radix.o rijndael.o entropy.o readpass.o rsa.o scard.o scard-opensc.o ssh-dss.o ssh-rsa.o tildexpand.o ttymodes.o uidswap.o uuencode.o xmalloc.o monitor_wrap.o monitor_fdpass.o kexgss.o gss-genr.o
 
 SSHOBJS= ssh.o sshconnect.o sshconnect1.o sshconnect2.o sshtty.o readconf.o clientloop.o
 
-SSHDOBJS= sshd.o auth.o auth1.o auth2.o auth2-hostbased.o auth2-kbdint.o auth2-none.o auth2-passwd.o auth2-pubkey.o auth-chall.o auth2-chall.o auth-rhosts.o auth-options.o auth-krb4.o auth-krb5.o auth-pam.o auth2-pam.o auth-passwd.o auth-rsa.o auth-rh-rsa.o auth-sia.o sshpty.o sshlogin.o loginrec.o servconf.o serverloop.o md5crypt.o session.o groupaccess.o auth-skey.o auth-bsdauth.o monitor_mm.o monitor.o
+SSHDOBJS= sshd.o auth.o auth1.o auth2.o auth2-hostbased.o auth2-kbdint.o auth2-none.o auth2-passwd.o auth2-pubkey.o auth-chall.o auth2-chall.o auth-rhosts.o auth-options.o auth-krb4.o auth-krb5.o auth-pam.o auth2-pam.o auth-passwd.o auth-rsa.o auth-rh-rsa.o auth-sia.o sshpty.o sshlogin.o loginrec.o servconf.o serverloop.o md5crypt.o session.o groupaccess.o auth-skey.o auth-bsdauth.o monitor_mm.o monitor.o auth2-gss.o gss-serv.o
 
 MANPAGES	= scp.1.out ssh-add.1.out ssh-agent.1.out ssh-keygen.1.out ssh-keyscan.1.out ssh.1.out sshd.8.out sftp-server.8.out sftp.1.out ssh-rand-helper.8.out ssh-keysign.8.out sshd_config.5.out ssh_config.5.out
 MANPAGES_IN	= scp.1 ssh-add.1 ssh-agent.1 ssh-keygen.1 ssh-keyscan.1 ssh.1 sshd.8 sftp-server.8 sftp.1 ssh-rand-helper.8 ssh-keysign.8 sshd_config.5 ssh_config.5
diff -u -N --exclude configure --exclude config.h.in src.old/acconfig.h src/acconfig.h
--- src.old/acconfig.h	Sat Jan 11 17:08:21 2003
+++ src/acconfig.h	Sat Jan 11 17:08:13 2003
@@ -201,6 +201,9 @@
 /* Define if compiler implements __func__ */
 #undef HAVE___func__
 
+/* Define this is you want GSSAPI support in the version 2 protocol */
+#undef GSSAPI
+
 /* Define if you want Kerberos 5 support */
 #undef KRB5
 
@@ -212,6 +215,9 @@
 
 /* Define if you want AFS support */
 #undef AFS
+
+/* Define if you want GSI/Globus authentication support */
+#undef GSI
 
 /* Define if you want S/Key support */
 #undef SKEY
diff -u -N --exclude configure --exclude config.h.in src.old/auth-pam.c src/auth-pam.c
--- src.old/auth-pam.c	Sat Jan 11 17:08:21 2003
+++ src/auth-pam.c	Sat Jan 11 17:08:14 2003
@@ -431,6 +431,26 @@
 	}
 }
 
+/* Set a PAM environment string. We need to do this so that the session
+ * modules can handle things like Kerberos/GSI credentials that appear
+ * during the ssh authentication process.
+ */
+
+int do_pam_putenv(char *name, char *value) {
+	char *compound;
+	int ret=1;
+
+#ifdef HAVE_PAM_PUTENV	
+	compound=xmalloc(strlen(name)+strlen(value)+2);
+	if (compound) {
+		sprintf(compound,"%s=%s",name,value);
+		ret=pam_putenv(__pamh,compound);
+		xfree(compound);
+	}
+#endif
+	return(ret);
+}
+
 /* Print any messages that have been generated during authentication */
 /* or account checking to stderr */
 void print_pam_messages(void)
diff -u -N --exclude configure --exclude config.h.in src.old/auth-pam.h src/auth-pam.h
--- src.old/auth-pam.h	Sat Jan 11 17:08:21 2003
+++ src/auth-pam.h	Sat Jan 11 17:08:14 2003
@@ -44,6 +44,7 @@
 int is_pam_password_change_required(void);
 void do_pam_chauthtok(void);
 void do_pam_set_conv(struct pam_conv *);
+int do_pam_putenv(char *, char *);
 void message_cat(char **p, const char *a);
 
 #endif /* USE_PAM */
diff -u -N --exclude configure --exclude config.h.in src.old/auth.h src/auth.h
--- src.old/auth.h	Sat Jan 11 17:08:21 2003
+++ src/auth.h	Sat Jan 11 17:08:14 2003
@@ -70,6 +70,7 @@
 	krb5_principal	 krb5_user;
 	char		*krb5_ticket_file;
 #endif
+	void *methoddata;
 };
 
 struct Authmethod {
diff -u -N --exclude configure --exclude config.h.in src.old/auth2-gss.c src/auth2-gss.c
--- src.old/auth2-gss.c	Wed Dec 31 18:00:00 1969
+++ src/auth2-gss.c	Sat Jan 11 17:08:14 2003
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+#include "auth.h"
+#include "ssh2.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "dispatch.h"
+#include "servconf.h"
+#include "compat.h"
+#include "packet.h"
+#include "monitor_wrap.h"
+
+#include "ssh-gss.h"
+
+extern ServerOptions options;
+
+static int
+userauth_external(Authctxt *authctxt)
+{
+        packet_check_eom();
+
+        return(PRIVSEP(ssh_gssapi_userok(authctxt->user)));
+}
+
+static void input_gssapi_token(int type, u_int32_t plen, void *ctxt);
+static void input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt);
+
+/* We only support those mechanisms that we know about (ie ones that we know
+ * how to check local user kuserok and the like
+ */
+static int
+userauth_gssapi(Authctxt *authctxt)
+{
+        gss_OID_desc    oid= {0,NULL};
+        Gssctxt         *ctxt = NULL;
+        int             mechs;
+        gss_OID_set     supported;
+        int             present;
+        OM_uint32       ms;
+        u_int           len;
+        
+        if (!authctxt->valid || authctxt->user == NULL)
+                return 0;
+                
+        if (datafellows & SSH_OLD_GSSAPI) {
+                debug("Early drafts of GSSAPI userauth not supported");
+                return 0;
+        }
+        
+        mechs=packet_get_int();
+        if (mechs==0) {
+                debug("Mechanism negotiation is not supported");
+                return 0;
+        }
+
+        ssh_gssapi_supported_oids(&supported);
+        do {
+                if (oid.elements)
+                        xfree(oid.elements);
+                oid.elements = packet_get_string(&len);
+                oid.length = len;
+                gss_test_oid_set_member(&ms, &oid, supported, &present);
+                mechs--;
+        } while (mechs>0 && !present);
+        
+        if (!present) {
+                xfree(oid.elements);
+                return(0);
+        }
+                
+	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt,&oid))))
+		return(0);
+	
+        authctxt->methoddata=(void *)ctxt;
+
+        /* Send SSH_MSG_USERAUTH_GSSAPI_RESPONSE */
+
+        packet_start(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE);
+        packet_put_string(oid.elements,oid.length);
+        packet_send();
+        packet_write_wait();
+        xfree(oid.elements);
+
+        dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, 
+                     &input_gssapi_token);
+        authctxt->postponed = 1;
+        
+        return 0;
+}
+
+static void
+input_gssapi_token(int type, u_int32_t plen, void *ctxt)
+{
+        Authctxt *authctxt = ctxt;
+        Gssctxt *gssctxt;
+        gss_buffer_desc send_tok,recv_tok;
+        OM_uint32 maj_status, min_status;
+        
+        if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
+                fatal("No authentication or GSSAPI context");
+                
+        gssctxt=authctxt->methoddata;
+        recv_tok.value=packet_get_string(&recv_tok.length);
+        
+        maj_status=PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok, 
+        					 &send_tok, NULL));
+        packet_check_eom();
+        
+        if (GSS_ERROR(maj_status)) {
+                /* Failure <sniff> */
+                authctxt->postponed = 0;
+                dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
+                userauth_finish(authctxt, 0, "gssapi");
+        }
+                        
+        if (send_tok.length != 0) {
+                /* Send a packet back to the client */
+                packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
+                packet_put_string(send_tok.value,send_tok.length);
+                packet_send();
+                packet_write_wait();
+                gss_release_buffer(&min_status, &send_tok);        
+        }
+        
+        if (maj_status == GSS_S_COMPLETE) {
+                dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN,NULL);
+                dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE,
+                             &input_gssapi_exchange_complete);
+        }
+}
+
+/* This is called when the client thinks we've completed authentication.
+ * It should only be enabled in the dispatch handler by the function above,
+ * which only enables it once the GSSAPI exchange is complete.
+ */
+ 
+static void
+input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt)
+{
+        Authctxt *authctxt = ctxt;
+        Gssctxt *gssctxt;
+        int authenticated;
+        
+	if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
+                fatal("No authentication or GSSAPI context");
+                
+        gssctxt=authctxt->methoddata;
+
+	/* We don't need to check the status, because the stored credentials
+	 * which userok uses are only populated once the context init step
+	 * has returned complete.
+	 */
+
+        authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
+
+        authctxt->postponed = 0;
+        dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
+        dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
+        userauth_finish(authctxt, authenticated, "gssapi");
+}
+
+Authmethod method_external = {
+	"external-keyx",
+	userauth_external,
+	&options.gss_authentication
+};
+	
+Authmethod method_gssapi = {
+        "gssapi",
+        userauth_gssapi,
+        &options.gss_authentication
+};
+
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/auth2.c src/auth2.c
--- src.old/auth2.c	Sat Jan 11 17:08:22 2003
+++ src/auth2.c	Sat Jan 11 17:08:14 2003
@@ -36,6 +36,10 @@
 #include "pathnames.h"
 #include "monitor_wrap.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 /* import */
 extern ServerOptions options;
 extern u_char *session_id2;
@@ -50,9 +54,15 @@
 extern Authmethod method_passwd;
 extern Authmethod method_kbdint;
 extern Authmethod method_hostbased;
+extern Authmethod method_external;
+extern Authmethod method_gssapi;
 
 Authmethod *authmethods[] = {
 	&method_none,
+#ifdef GSSAPI
+	&method_external,
+	&method_gssapi,
+#endif
 	&method_pubkey,
 	&method_passwd,
 	&method_kbdint,
@@ -180,6 +190,12 @@
 	}
 	/* reset state */
 	auth2_challenge_stop(authctxt);
+
+#ifdef GSSAPI
+	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
+	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
+#endif
+
 	authctxt->postponed = 0;
 
 	/* try to authenticate user */
diff -u -N --exclude configure --exclude config.h.in src.old/compat.c src/compat.c
--- src.old/compat.c	Sat Jan 11 17:08:22 2003
+++ src/compat.c	Sat Jan 11 17:08:15 2003
@@ -71,12 +71,14 @@
 		{ "OpenSSH_2.5.0p1*,"
 		  "OpenSSH_2.5.1p1*",
 					SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
-					SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
+					SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
+					SSH_OLD_GSSAPI},
 		{ "OpenSSH_2.5.0*,"
 		  "OpenSSH_2.5.1*,"
 		  "OpenSSH_2.5.2*",	SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
 					SSH_BUG_EXTEOF},
 		{ "OpenSSH_2.5.3*",	SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
+		{ "OpenSSH_2.9p*",	SSH_BUG_EXTEOF|SSH_OLD_GSSAPI},
 		{ "OpenSSH_2.*,"
 		  "OpenSSH_3.0*,"
 		  "OpenSSH_3.1*",	SSH_BUG_EXTEOF},
diff -u -N --exclude configure --exclude config.h.in src.old/compat.h src/compat.h
--- src.old/compat.h	Sat Jan 11 17:08:22 2003
+++ src/compat.h	Sat Jan 11 17:08:15 2003
@@ -55,6 +55,7 @@
 #define SSH_BUG_EXTEOF		0x00200000
 #define SSH_BUG_K5USER		0x00400000
 #define SSH_BUG_PROBE		0x00800000
+#define SSH_OLD_GSSAPI		0x01000000
 
 void     enable_compat13(void);
 void     enable_compat20(void);
diff -u -N --exclude configure --exclude config.h.in src.old/configure.ac src/configure.ac
--- src.old/configure.ac	Sat Jan 11 17:08:22 2003
+++ src/configure.ac	Sat Jan 11 17:08:15 2003
@@ -695,6 +695,7 @@
 			AC_CHECK_LIB(dl, dlopen, , )
 			AC_CHECK_LIB(pam, pam_set_item, , AC_MSG_ERROR([*** libpam missing]))
 			AC_CHECK_FUNCS(pam_getenvlist)
+			AC_CHECK_FUNCS(pam_putenv)
 
 			disable_shadow=yes
 			PAM_MSG="yes"
@@ -705,6 +706,7 @@
 			else
 				LIBPAM="-lpam"
 			fi
+
 			AC_SUBST(LIBPAM)
 		fi
 	]
@@ -735,6 +737,47 @@
 	AC_CHECK_LIB(crypt, crypt)
 fi
 
+# Start of GSI/Globus 2.0 mods
+# Check whether the user wants GSI (Globus 2.0) support
+# if we are using GSI, we will also use the 
+# OPenSSL that is built by Globus. This is called
+# -lcrypto_FLAVOR
+# and it will be in the GSI path. 
+# The includes will be in the include/FLAVOR/openssl
+# therfore we will not process the -with-ssl parameter.
+
+gsi_path="no"
+AC_ARG_WITH(gsi,
+    [  --with-gsi=PATH         Enable GSI/Globus GSSAPI support],
+    [
+        gsi_path="$withval"
+    ]
+)
+
+gsi_flavor=gcc32dbg
+AC_ARG_WITH(gsi-flavor,
+      [  --with-gsi-flavor=FLAVOR Globus build flavor ],
+      [
+              gsi_flavor="$withval"
+      ]
+)
+
+if test "x$gsi_path" != "xno" ; then
+    # Globus GSSAPI configuration
+    AC_DEFINE(GSSAPI)
+    AC_DEFINE(GSI)
+      AC_DEFINE(HAVE_OPENSSL)
+      LDFLAGS="$LDFLAGS -L${gsi_path}/lib"
+    if test ! -z "$need_dash_r" ; then
+        LDFLAGS="$LDFLAGS -R${gsi_path}/lib"
+    fi
+    if test ! -z "$blibpath" ; then
+        blibpath="$blibpath:${gsi_path}/lib"
+    fi
+      LIBS="$LIBS -lcrypto_${gsi_flavor} -lglobus_gss_assist_${gsi_flavor} -lglobus_gssapi_gsi_${gsi_flavor}"
+      CPPFLAGS="$CPPFLAGS -I${gsi_path}/include -I${gsi_path}/include/${gsi_flavor}"
+else
+
 # Search for OpenSSL
 saved_CPPFLAGS="$CPPFLAGS"
 saved_LDFLAGS="$LDFLAGS"
@@ -781,6 +824,9 @@
 	]
 )
 
+fi
+#end of GSI/Globus 2.0 mods
+
 # Determine OpenSSL header version
 AC_MSG_CHECKING([OpenSSL header version])
 AC_TRY_RUN(
@@ -1786,6 +1832,31 @@
                                 blibpath="$blibpath:${KRB5ROOT}/lib"
                         fi
                         AC_CHECK_LIB(resolv, dn_expand, , )
+
+						AC_CHECK_LIB(gssapi,gss_init_sec_context,
+							[ AC_DEFINE(GSSAPI)
+							K5LIBS="-lgssapi $K5LIBS" ],
+							[ AC_CHECK_LIB(gssapi_krb5,gss_init_sec_context,
+								[ AC_DEFINE(GSSAPI)
+				  				K5LIBS="-lgssapi_krb5 $K5LIBS" ],
+								AC_MSG_WARN([Cannot find any suitable gss-api library - build may fail]),
+								$K5LIBS)
+							],
+							$K5LIBS)
+			
+						AC_CHECK_HEADER(gssapi.h, ,
+							[ unset ac_cv_header_gssapi_h
+							CPPFLAGS="$CPPFLAGS -I${KRB5ROOT}/include/gssapi" 
+							AC_CHECK_HEADERS(gssapi.h, ,
+								AC_MSG_WARN([Cannot find any suitable gss-api header - build may fail])
+							) 
+							]
+						)
+
+						oldCPP="$CPPFLAGS"
+						CPPFLAGS="$CPPFLAGS -I${KRB5ROOT}/include/gssapi"
+						AC_CHECK_HEADER(gssapi_krb5.h, ,
+								[ CPPFLAGS="$oldCPP" ])
 
                         KRB5=yes
                 fi
diff -u -N --exclude configure --exclude config.h.in src.old/gss-genr.c src/gss-genr.c
--- src.old/gss-genr.c	Wed Dec 31 18:00:00 1969
+++ src/gss-genr.c	Sat Jan 11 17:08:15 2003
@@ -0,0 +1,542 @@
+/*
+ * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved. *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include "ssh.h"
+#include "ssh2.h"
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "packet.h"
+#include "compat.h"
+#include <openssl/evp.h>
+#include "cipher.h"
+#include "kex.h"
+#include "log.h"
+#include "compat.h"
+#include "monitor_wrap.h"
+
+#include <netdb.h>
+
+#include "ssh-gss.h"
+
+/* Assorted globals for tracking the clients identity once they've
+ * authenticated */
+ 
+gss_buffer_desc gssapi_client_name = {0,NULL}; /* Name of our client */
+gss_cred_id_t   gssapi_client_creds = GSS_C_NO_CREDENTIAL; /* Their credentials */
+enum ssh_gss_id gssapi_client_type = GSS_LAST_ENTRY;
+
+/* The mechanism name used in the list below is defined in the internet
+ * draft as the Base 64 encoding of the MD5 hash of the ASN.1 DER encoding 
+ * of the underlying GSSAPI mechanism's OID.
+ *
+ * Also from the draft, before considering adding SPNEGO, bear in mind that
+ * "mechanisms ... MUST NOT use SPNEGO as the underlying GSSAPI mechanism"
+ */
+
+/* These must be in the same order as ssh_gss_id, in ssh-gss.h */
+
+ssh_gssapi_mech supported_mechs[]= {
+#ifdef KRB5
+ /* Official OID - 1.2.850.113554.1.2.2 */
+ {"Se3H81ismmOC3OE+FwYCiQ==","Kerberos",
+ 	{9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}},
+#endif
+#ifdef GSI
+ /* gssapi_ssleay 1.3.6.1.4.1.3536.1.1 */
+ {"N3+k7/4wGxHyuP8Yxi4RhA==",
+  "GSI",
+  {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"}
+ },
+#endif /* GSI */
+ {NULL,NULL,{0,0}}
+};
+
+char gssprefix[]=KEX_GSS_SHA1;
+
+/* Return a list of the gss-group1-sha1-x mechanisms supported by this
+ * program.
+ *
+ * We only support the mechanisms that we've indicated in the list above,
+ * but we check that they're supported by the GSSAPI mechanism on the 
+ * machine. We also check, before including them in the list, that
+ * we have the necesary information in order to carry out the key exchange
+ * (that is, that the user has credentials, the server's creds are accessible,
+ * etc)
+ *
+ * The way that this is done is fairly nasty, as we do a lot of work that
+ * is then thrown away. This should possibly be implemented with a cache
+ * that stores the results (in an expanded Gssctxt structure), which are
+ * then used by the first calls if that key exchange mechanism is chosen.
+ */
+ 
+char * 
+ssh_gssapi_mechanisms(int server,char *host) {
+	gss_OID_set 	supported;
+	OM_uint32	maj_status, min_status;
+	Buffer		buf;
+	int 		i = 0;
+	int		present;
+	char *		mechs;
+	Gssctxt *	ctx = NULL;	
+
+	if (datafellows & SSH_OLD_GSSAPI) return NULL;
+	
+	gss_indicate_mechs(&min_status, &supported);
+	
+	buffer_init(&buf);	
+
+	do {
+		if ((maj_status=gss_test_oid_set_member(&min_status,
+						   	&supported_mechs[i].oid,
+						   	supported,
+						   	&present))) {
+			present=0;
+		}
+		if (present) {
+		    	if ((server && 
+		    	     !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
+		    	  			            &supported_mechs[i].oid)))) 
+		    	    || (!server &&
+		    	        !GSS_ERROR(ssh_gssapi_client_ctx(&ctx,
+		    	 			       &supported_mechs[i].oid,
+		    	 			       host)))) {
+				/* Append gss_group1_sha1_x to our list */
+				buffer_append(&buf, gssprefix,
+					      strlen(gssprefix));
+		        	buffer_append(&buf, 
+		        		      supported_mechs[i].enc_name,
+	        	      		      strlen(supported_mechs[i].enc_name));
+	               }
+ 		}
+	} while (supported_mechs[++i].name != NULL);
+	
+	buffer_put_char(&buf,'\0');
+	
+	mechs=xmalloc(buffer_len(&buf));
+	buffer_get(&buf,mechs,buffer_len(&buf));
+	buffer_free(&buf);
+	if (strlen(mechs)==0)
+	   return(NULL);
+	else
+	   return(mechs);
+}
+
+void ssh_gssapi_supported_oids(gss_OID_set *oidset) {
+	enum ssh_gss_id i =0;
+	OM_uint32 maj_status,min_status;
+	int present;
+	gss_OID_set supported;
+	
+	gss_create_empty_oid_set(&min_status,oidset);
+	gss_indicate_mechs(&min_status, &supported);
+
+	while (supported_mechs[i].name!=NULL) {
+		if ((maj_status=gss_test_oid_set_member(&min_status,
+						       &supported_mechs[i].oid,
+						       supported,
+						       &present))) {
+			present=0;
+		}
+		if (present) {
+			gss_add_oid_set_member(&min_status,
+					       &supported_mechs[i].oid,
+				       	       oidset);	
+		}
+		i++;
+	}
+}	
+
+/* Set the contexts OID from a data stream */
+void ssh_gssapi_set_oid_data(Gssctxt *ctx, void *data, size_t len) { 
+  if (ctx->oid != GSS_C_NO_OID) {
+	xfree(ctx->oid->elements);
+   	xfree(ctx->oid);
+  }
+  ctx->oid=xmalloc(sizeof(gss_OID_desc));
+  ctx->oid->length=len;
+  ctx->oid->elements=xmalloc(len);
+  memcpy(ctx->oid->elements,data,len);
+}
+
+/* Set the contexts OID */
+void ssh_gssapi_set_oid(Gssctxt *ctx, gss_OID oid) {  
+  ssh_gssapi_set_oid_data(ctx,oid->elements,oid->length);
+}
+
+/* Find out which GSS type (out of the list we define in ssh-gss.h) a
+ * particular connection is using 
+ */
+enum ssh_gss_id ssh_gssapi_get_ctype(Gssctxt *ctxt) {
+	enum ssh_gss_id i=0;
+	
+	while(supported_mechs[i].name!=NULL &&
+	      	supported_mechs[i].oid.length != ctxt->oid->length &&
+	      	(memcmp(supported_mechs[i].oid.elements,
+	      	       ctxt->oid->elements,ctxt->oid->length) !=0)) {
+	   i++;
+	}
+	return(i);
+}
+
+/* Set the GSS context's OID to the oid indicated by the given key exchange
+ * name. */
+gss_OID ssh_gssapi_id_kex(Gssctxt *ctx, char *name) {
+  enum ssh_gss_id i=0;
+  
+  if (strncmp(name, gssprefix, strlen(gssprefix)-1) !=0) {
+     return(NULL);
+  }
+  
+  name+=strlen(gssprefix); /* Move to the start of the MIME string */
+  
+  while (supported_mechs[i].name!=NULL &&
+  	 strcmp(name,supported_mechs[i].enc_name)!=0) {
+  	i++;
+  }
+
+  if (supported_mechs[i].name==NULL)
+     return (NULL);
+
+  if (ctx) ssh_gssapi_set_oid(ctx,&supported_mechs[i].oid);
+
+  return &supported_mechs[i].oid;
+}
+
+
+/* All this effort to report an error ... 
+ * ... and with privsep, how on earth do we get it back to the client? */
+
+void
+ssh_gssapi_error(OM_uint32 major_status,OM_uint32 minor_status) {
+	OM_uint32 lmaj, lmin;
+        gss_buffer_desc msg;
+        OM_uint32 ctx;
+        
+        ctx = 0;
+	/* The GSSAPI error */
+        do {
+        	lmaj = gss_display_status(&lmin, major_status,
+        				  GSS_C_GSS_CODE,
+        				  GSS_C_NULL_OID,
+        				  &ctx, &msg);
+        	if (lmaj == GSS_S_COMPLETE) {
+        	    	debug((char *)msg.value);
+        	    	(void) gss_release_buffer(&lmin, &msg);
+        	}
+        } while (ctx!=0);	   
+
+        /* The mechanism specific error */
+        do {
+        	lmaj = gss_display_status(&lmin, minor_status,
+        				  GSS_C_MECH_CODE,
+        				  GSS_C_NULL_OID,
+        				  &ctx, &msg);
+        	if (lmaj == GSS_S_COMPLETE) {
+        	    	debug((char *)msg.value);
+        	    	(void) gss_release_buffer(&lmin, &msg);
+        	}
+        } while (ctx!=0);
+}
+
+/* Initialise our GSSAPI context. We use this opaque structure to contain all
+ * of the data which both the client and server need to persist across
+ * {accept,init}_sec_context calls, so that when we do it from the userauth
+ * stuff life is a little easier
+ */
+void
+ssh_gssapi_build_ctx(Gssctxt **ctx)
+{
+	*ctx=xmalloc(sizeof (Gssctxt));
+	(*ctx)->context=GSS_C_NO_CONTEXT;
+	(*ctx)->name=GSS_C_NO_NAME;
+	(*ctx)->oid=GSS_C_NO_OID;
+	(*ctx)->creds=GSS_C_NO_CREDENTIAL;
+	(*ctx)->client=GSS_C_NO_NAME;
+	(*ctx)->client_creds=GSS_C_NO_CREDENTIAL;
+}
+
+/* Delete our context, providing it has been built correctly */
+void
+ssh_gssapi_delete_ctx(Gssctxt **ctx)
+{
+	OM_uint32 ms;
+	
+	/* Return if there's no context */
+	if ((*ctx)==NULL)
+		return;
+		
+	if ((*ctx)->context != GSS_C_NO_CONTEXT) 
+		gss_delete_sec_context(&ms,&(*ctx)->context,GSS_C_NO_BUFFER);
+	if ((*ctx)->name != GSS_C_NO_NAME)
+		gss_release_name(&ms,&(*ctx)->name);
+	if ((*ctx)->oid != GSS_C_NO_OID) {
+		xfree((*ctx)->oid->elements);
+		xfree((*ctx)->oid);
+		(*ctx)->oid = GSS_C_NO_OID;
+	}
+	if ((*ctx)->creds != GSS_C_NO_CREDENTIAL)
+		gss_release_cred(&ms,&(*ctx)->creds);
+	if ((*ctx)->client != GSS_C_NO_NAME)
+		gss_release_name(&ms,&(*ctx)->client);	
+	if ((*ctx)->client_creds != GSS_C_NO_CREDENTIAL)
+		gss_release_cred(&ms,&(*ctx)->client_creds);
+	
+	xfree(*ctx);
+	*ctx=NULL; 
+}
+
+/* Wrapper to init_sec_context 
+ * Requires that the context contains:
+ *	oid
+ * 	server name (from ssh_gssapi_import_name)
+ */
+OM_uint32 
+ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok,
+       	      	    gss_buffer_desc* send_tok, OM_uint32 *flags) 
+{
+      	OM_uint32 maj_status, min_status;
+	int deleg_flag = 0;
+	
+	if (deleg_creds) {
+		deleg_flag=GSS_C_DELEG_FLAG;
+		debug("Delegating credentials");
+	}
+	      	
+      	maj_status=gss_init_sec_context(&min_status,
+      					GSS_C_NO_CREDENTIAL, /* def. cred */
+      					&ctx->context,
+      					ctx->name,
+      					ctx->oid,
+      					GSS_C_MUTUAL_FLAG |
+      					GSS_C_INTEG_FLAG |
+      					deleg_flag,
+      					0, /* default lifetime */
+      					NULL, /* no channel bindings */
+      					recv_tok,
+      					NULL,
+      					send_tok,
+      					flags,
+      					NULL);
+	ctx->status=maj_status;
+      	if (GSS_ERROR(maj_status)) {
+      		ssh_gssapi_error(maj_status,min_status);
+      	}
+      	return(maj_status);
+}
+
+/* Wrapper arround accept_sec_context
+ * Requires that the context contains:
+ *    oid		
+ *    credentials	(from ssh_gssapi_acquire_cred)
+ */
+OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx,gss_buffer_desc *recv_tok,
+				gss_buffer_desc *send_tok, OM_uint32 *flags) 
+{
+	OM_uint32 maj_status, min_status;
+	gss_OID mech;
+	
+	maj_status=gss_accept_sec_context(&min_status,
+					  &ctx->context,
+					  ctx->creds,
+					  recv_tok,
+					  GSS_C_NO_CHANNEL_BINDINGS,
+					  &ctx->client,
+					  &mech,
+					  send_tok,
+					  flags,
+					  NULL,
+					  &ctx->client_creds);
+	if (GSS_ERROR(maj_status)) {
+		ssh_gssapi_error(maj_status,min_status);
+	}
+	
+	if (ctx->client_creds) {
+		debug("Received some client credentials");
+	} else {
+		debug("Got no client credentials");
+	}
+
+	/* FIXME: We should check that the me
+	 * the one that we asked for (in ctx->oid) */
+
+	ctx->status=maj_status;
+	
+	/* Now, if we're complete and we have the right flags, then
+	 * we flag the user as also having been authenticated
+	 */
+	
+	if (((flags==NULL) || ((*flags & GSS_C_MUTUAL_FLAG) && 
+	                       (*flags & GSS_C_INTEG_FLAG))) &&
+	    (maj_status == GSS_S_COMPLETE)) {
+		if (ssh_gssapi_getclient(ctx,&gssapi_client_type,
+	  			         &gssapi_client_name,
+	  			         &gssapi_client_creds))
+	  		fatal("Couldn't convert client name");
+	}
+
+	return(maj_status);
+}
+
+/* Create a service name for the given host */
+OM_uint32
+ssh_gssapi_import_name(Gssctxt *ctx, const char *host) {
+	gss_buffer_desc gssbuf;
+	OM_uint32 maj_status, min_status;
+	struct hostent *hostinfo = NULL;
+	char *xhost;
+	
+	/* Make a copy of the host name, in case it was returned by a
+	 * previous call to gethostbyname(). */	
+	xhost = xstrdup(host);
+
+	/* Make sure we have the FQDN. Some GSSAPI implementations don't do
+	 * this for us themselves */
+	
+	hostinfo = gethostbyname(xhost);
+	
+	if ((hostinfo == NULL) || (hostinfo->h_name == NULL)) {
+		debug("Unable to get FQDN for \"%s\"", xhost);
+	} else {
+		xfree(xhost);
+		xhost = xstrdup(hostinfo->h_name);
+	}
+		
+        gssbuf.length = sizeof("host@")+strlen(xhost);
+
+        gssbuf.value = xmalloc(gssbuf.length);
+        if (gssbuf.value == NULL) {
+		xfree(xhost);
+		return(-1);
+        }
+        snprintf(gssbuf.value,gssbuf.length,"host@%s",xhost);
+        if ((maj_status=gss_import_name(&min_status,
+                                   	&gssbuf,
+                                        GSS_C_NT_HOSTBASED_SERVICE,
+                                        &ctx->name))) {
+		ssh_gssapi_error(maj_status,min_status);
+	}
+	
+	xfree(xhost);
+	xfree(gssbuf.value);
+	return(maj_status);
+}
+
+/* Acquire credentials for a server running on the current host.
+ * Requires that the context structure contains a valid OID
+ */
+ 
+/* Returns a GSSAPI error code */
+OM_uint32
+ssh_gssapi_acquire_cred(Gssctxt *ctx) {
+	OM_uint32 maj_status, min_status;
+	char lname[MAXHOSTNAMELEN];
+	gss_OID_set oidset;
+	
+	gss_create_empty_oid_set(&min_status,&oidset);
+	gss_add_oid_set_member(&min_status,ctx->oid,&oidset);
+	
+        if (gethostname(lname, MAXHOSTNAMELEN)) {
+                return(-1);
+        }
+
+	if ((maj_status=ssh_gssapi_import_name(ctx,lname))) {
+		return(maj_status);
+	}
+	if ((maj_status=gss_acquire_cred(&min_status,
+			 	    ctx->name,
+				    0,
+				    oidset,
+				    GSS_C_ACCEPT,
+				    &ctx->creds,
+				    NULL,
+				    NULL))) {
+		ssh_gssapi_error(maj_status,min_status);
+	}
+				
+	gss_release_oid_set(&min_status, &oidset);
+	return(maj_status);
+}
+
+/* Extract the client details from a given context. This can only reliably
+ * be called once for a context */
+
+OM_uint32 
+ssh_gssapi_getclient(Gssctxt *ctx, enum ssh_gss_id *type,
+		     gss_buffer_desc *name, gss_cred_id_t *creds) {
+
+	OM_uint32 maj_status,min_status;
+	
+	*type=ssh_gssapi_get_ctype(ctx);
+	if ((maj_status=gss_display_name(&min_status,ctx->client,name,NULL))) {
+		ssh_gssapi_error(maj_status,min_status);
+	}
+	
+	/* This is icky. There appears to be no way to copy this structure,
+	 * rather than the pointer to it, so we simply copy the pointer and
+	 * mark the originator as empty so we don't destroy it. 
+	 */
+	*creds=ctx->client_creds;
+	ctx->client_creds=GSS_C_NO_CREDENTIAL;
+	return(maj_status);
+}
+
+OM_uint32
+ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *buffer, gss_buffer_desc *hash) {
+	OM_uint32 maj_status,min_status;
+	
+	if ((maj_status=gss_get_mic(&min_status,ctx->context,
+				    GSS_C_QOP_DEFAULT, buffer, hash))) {
+		ssh_gssapi_error(maj_status,min_status);
+	}
+	
+	return(maj_status);
+}
+
+OM_uint32
+ssh_gssapi_server_ctx(Gssctxt **ctx,gss_OID oid) {
+	if (*ctx) ssh_gssapi_delete_ctx(ctx);
+	ssh_gssapi_build_ctx(ctx);
+	ssh_gssapi_set_oid(*ctx,oid);
+	return(ssh_gssapi_acquire_cred(*ctx));
+}
+
+OM_uint32 
+ssh_gssapi_client_ctx(Gssctxt **ctx,gss_OID oid, char *host) {
+	gss_buffer_desc token;
+	OM_uint32 major,minor;
+	
+	if (*ctx) ssh_gssapi_delete_ctx(ctx);
+	ssh_gssapi_build_ctx(ctx);
+	ssh_gssapi_set_oid(*ctx,oid);
+	ssh_gssapi_import_name(*ctx,host);
+	major=ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token, NULL);
+	gss_release_buffer(&minor,&token);
+	return(major);
+}
+                                                                                        
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/gss-serv.c src/gss-serv.c
--- src.old/gss-serv.c	Wed Dec 31 18:00:00 1969
+++ src/gss-serv.c	Sat Jan 11 17:08:15 2003
@@ -0,0 +1,606 @@
+/*
+ * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include "ssh.h"
+#include "ssh2.h"
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "packet.h"
+#include "compat.h"
+#include <openssl/evp.h>
+#include "cipher.h"
+#include "kex.h"
+#include "auth.h"
+#include "log.h"
+#include "channels.h"
+#include "session.h"
+#include "dispatch.h"
+#include "servconf.h"
+#include "compat.h"
+#include "monitor_wrap.h"
+
+#include "ssh-gss.h"
+
+extern ServerOptions options;
+extern u_char *session_id2;
+extern int session_id2_len;
+
+typedef struct ssh_gssapi_cred_cache {
+	char *filename;
+	char *envvar;
+	char *envval;
+	void *data;
+} ssh_gssapi_cred_cache;
+
+static struct ssh_gssapi_cred_cache gssapi_cred_store = {NULL,NULL,NULL};
+
+#ifdef KRB5
+
+#ifdef HEIMDAL
+#include <krb5.h>
+#else
+#include <gssapi_krb5.h>
+#define krb5_get_err_text(context,code) error_message(code)
+#endif
+
+static krb5_context krb_context = NULL;
+
+/* Initialise the krb5 library, so we can use it for those bits that
+ * GSSAPI won't do */
+
+int ssh_gssapi_krb5_init() {
+	krb5_error_code problem;
+	
+	if (krb_context !=NULL)
+		return 1;
+		
+	problem = krb5_init_context(&krb_context);
+	if (problem) {
+		log("Cannot initialize krb5 context");
+		return 0;
+	}
+	krb5_init_ets(krb_context);
+
+	return 1;	
+}			
+
+/* Check if this user is OK to login. This only works with krb5 - other 
+ * GSSAPI mechanisms will need their own.
+ * Returns true if the user is OK to log in, otherwise returns 0
+ */
+
+int
+ssh_gssapi_krb5_userok(char *name) {
+	krb5_principal princ;
+	int retval;
+
+	if (ssh_gssapi_krb5_init() == 0)
+		return 0;
+		
+	if ((retval=krb5_parse_name(krb_context, gssapi_client_name.value, 
+				    &princ))) {
+		log("krb5_parse_name(): %.100s", 
+			krb5_get_err_text(krb_context,retval));
+		return 0;
+	}
+	if (krb5_kuserok(krb_context, princ, name)) {
+		retval = 1;
+		log("Authorized to %s, krb5 principal %s (krb5_kuserok)",name,
+		    (char *)gssapi_client_name.value);
+	}
+	else
+		retval = 0;
+	
+	krb5_free_principal(krb_context, princ);
+	return retval;
+}
+	
+/* Make sure that this is called _after_ we've setuid to the user */
+
+/* This writes out any forwarded credentials. Its specific to the Kerberos
+ * GSSAPI mechanism
+ *
+ * We assume that our caller has made sure that the user has selected
+ * delegated credentials, and that the client_creds structure is correctly
+ * populated.
+ */
+
+void
+ssh_gssapi_krb5_storecreds() {
+	krb5_ccache ccache;
+	krb5_error_code problem;
+	krb5_principal princ;
+	char ccname[35];
+	static char name[40];
+	int tmpfd;
+	OM_uint32 maj_status,min_status;
+
+
+	if (gssapi_client_creds==NULL) {
+		debug("No credentials stored"); 
+		return;
+	}
+		
+	if (ssh_gssapi_krb5_init() == 0)
+		return;
+
+	if (options.gss_use_session_ccache) {
+        	snprintf(ccname,sizeof(ccname),"/tmp/krb5cc_%d_XXXXXX",geteuid());
+       
+        	if ((tmpfd = mkstemp(ccname))==-1) {
+                	log("mkstemp(): %.100s", strerror(errno));
+                	return;
+        	}
+	        if (fchmod(tmpfd, S_IRUSR | S_IWUSR) == -1) {
+	               	log("fchmod(): %.100s", strerror(errno));
+	               	close(tmpfd);
+	               	return;
+	        }
+        } else {
+        	snprintf(ccname,sizeof(ccname),"/tmp/krb5cc_%d",geteuid());
+        	tmpfd = open(ccname, O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR);
+        	if (tmpfd == -1) {
+        		log("open(): %.100s", strerror(errno));
+        		return;
+        	}
+        }
+
+       	close(tmpfd);
+        snprintf(name, sizeof(name), "FILE:%s",ccname);
+ 
+        if ((problem = krb5_cc_resolve(krb_context, name, &ccache))) {
+                log("krb5_cc_default(): %.100s", 
+                	krb5_get_err_text(krb_context,problem));
+                return;
+        }
+
+	if ((problem = krb5_parse_name(krb_context, gssapi_client_name.value, 
+				       &princ))) {
+		log("krb5_parse_name(): %.100s", 
+			krb5_get_err_text(krb_context,problem));
+		krb5_cc_destroy(krb_context,ccache);
+		return;
+	}
+	
+	if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
+		log("krb5_cc_initialize(): %.100s", 
+			krb5_get_err_text(krb_context,problem));
+		krb5_free_principal(krb_context,princ);
+		krb5_cc_destroy(krb_context,ccache);
+		return;
+	}
+	
+	krb5_free_principal(krb_context,princ);
+
+	#ifdef HEIMDAL
+	if ((problem = krb5_cc_copy_cache(krb_context, 
+					   gssapi_client_creds->ccache,
+					   ccache))) {
+		log("krb5_cc_copy_cache(): %.100s", 
+			krb5_get_err_text(krb_context,problem));
+		krb5_cc_destroy(krb_context,ccache);
+		return;
+	}
+	#else
+	if ((maj_status = gss_krb5_copy_ccache(&min_status, 
+					       gssapi_client_creds, 
+					       ccache))) {
+		log("gss_krb5_copy_ccache() failed");
+		ssh_gssapi_error(maj_status,min_status);
+		krb5_cc_destroy(krb_context,ccache);
+		return;
+	}
+	#endif
+	
+	krb5_cc_close(krb_context,ccache);
+
+
+#ifdef USE_PAM
+	do_pam_putenv("KRB5CCNAME",name);
+#endif
+
+	gssapi_cred_store.filename=strdup(ccname);
+	gssapi_cred_store.envvar="KRB5CCNAME";
+	gssapi_cred_store.envval=strdup(name);
+
+	return;
+}
+
+#endif /* KRB5 */
+
+#ifdef GSI
+#include <globus_gss_assist.h>
+
+/*
+ * Check if this user is OK to login under GSI. User has been authenticated
+ * as identity in global 'client_name.value' and is trying to log in as passed
+ * username in 'name'.
+ *
+ * Returns non-zero if user is authorized, 0 otherwise.
+ */
+int
+ssh_gssapi_gsi_userok(char *name)
+{
+    int authorized = 0;
+    
+    /* This returns 0 on success */
+    authorized = (globus_gss_assist_userok(gssapi_client_name.value,
+					   name) == 0);
+    
+    debug("GSI user %s is%s authorized as target user %s",
+	  (char *) gssapi_client_name.value,
+	  (authorized ? "" : " not"),
+	  name);
+    
+    return authorized;
+}
+
+/*
+ * Handle setting up child environment for GSI.
+ *
+ * Make sure that this is called _after_ we've setuid to the user.
+ */
+void
+ssh_gssapi_gsi_storecreds()
+{
+	OM_uint32	major_status;
+	OM_uint32	minor_status;
+	
+	
+	if (gssapi_client_creds != NULL)
+	{
+		char *creds_env = NULL;
+
+		/*
+ 		 * This is the current hack with the GSI gssapi library to
+		 * export credentials to disk.
+		 */
+
+		debug("Exporting delegated credentials");
+		
+		minor_status = 0xdee0;	/* Magic value */
+		major_status =
+			gss_inquire_cred(&minor_status,
+					 gssapi_client_creds,
+					 (gss_name_t *) &creds_env,
+					 NULL,
+					 NULL,
+					 NULL);
+
+		if ((major_status == GSS_S_COMPLETE) &&
+		    (minor_status == 0xdee1) &&
+		    (creds_env != NULL))
+		{
+			char		*value;
+				
+			/*
+			 * String is of the form:
+			 * X509_USER_DELEG_PROXY=filename
+			 * so we parse out the filename
+			 * and then set X509_USER_PROXY
+			 * to point at it.
+			 */
+			value = strchr(creds_env, '=');
+			
+			if (value != NULL)
+			{
+				*value = '\0';
+				value++;
+#ifdef USE_PAM
+				do_pam_putenv("X509_USER_PROXY",value);
+#endif
+			 	gssapi_cred_store.filename=NULL;
+				gssapi_cred_store.envvar="X509_USER_PROXY";
+				gssapi_cred_store.envval=strdup(value);
+
+				return;
+			}
+			else
+			{
+				log("Failed to parse delegated credentials string '%s'",
+				    creds_env);
+			}
+		}
+		else
+		{
+			log("Failed to export delegated credentials (error %ld)",
+			    major_status);
+		}
+	}	
+}
+
+#endif /* GSI */
+
+void
+ssh_gssapi_cleanup_creds(void *ignored)
+{
+	if (gssapi_cred_store.filename!=NULL) {
+		/* Unlink probably isn't sufficient */
+		debug("removing gssapi cred file\"%s\"",gssapi_cred_store.filename);
+		unlink(gssapi_cred_store.filename);
+	}
+}
+
+void 
+ssh_gssapi_storecreds()
+{
+	switch (gssapi_client_type) {
+#ifdef KRB5
+	case GSS_KERBEROS:
+		ssh_gssapi_krb5_storecreds();
+		break;
+#endif
+#ifdef GSI
+	case GSS_GSI:
+		ssh_gssapi_gsi_storecreds();
+		break;
+#endif /* GSI */
+	case GSS_LAST_ENTRY:
+		/* GSSAPI not used in this authentication */
+		debug("No GSSAPI credentials stored");
+		break;
+	default:
+		log("ssh_gssapi_do_child: Unknown mechanism");
+	
+	}
+	
+	if (options.gss_cleanup_creds) {
+		fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
+	}
+
+}
+
+/* This allows GSSAPI methods to do things to the childs environment based
+ * on the passed authentication process and credentials.
+ *
+ * Question: If we didn't use userauth_external for some reason, should we
+ * still delegate credentials?
+ */
+void 
+ssh_gssapi_do_child(char ***envp, u_int *envsizep) 
+{
+
+	if (gssapi_cred_store.envvar!=NULL && 
+	    gssapi_cred_store.envval!=NULL) {
+	    
+		debug("Setting %s to %s", gssapi_cred_store.envvar,
+					  gssapi_cred_store.envval);				  
+		child_set_env(envp, envsizep, gssapi_cred_store.envvar, 
+					      gssapi_cred_store.envval);
+	}
+
+	switch(gssapi_client_type) {
+#ifdef KRB5
+	case GSS_KERBEROS: break;
+#endif
+#ifdef GSI
+	case GSS_GSI: break;
+#endif
+	case GSS_LAST_ENTRY:
+		debug("No GSSAPI credentials stored");
+		break;
+	default:
+		log("ssh_gssapi_do_child: Unknown mechanism");
+	}
+}
+
+int
+ssh_gssapi_userok(char *user)
+{
+	if (gssapi_client_name.length==0 || 
+	    gssapi_client_name.value==NULL) {
+		debug("No suitable client data");
+		return 0;
+	}
+	switch (gssapi_client_type) {
+#ifdef KRB5
+	case GSS_KERBEROS:
+		return(ssh_gssapi_krb5_userok(user));
+		break; /* Not reached */
+#endif
+#ifdef GSI
+	case GSS_GSI:
+		return(ssh_gssapi_gsi_userok(user));
+		break; /* Not reached */
+#endif /* GSI */
+	case GSS_LAST_ENTRY:
+		debug("Client not GSSAPI");
+		break;
+	default:
+		debug("Unknown client authentication type");
+	}
+	return(0);
+}
+
+/* Stuff to play nicely with privsep */
+
+#if 0
+extern struct monitor *pmonitor;
+
+OM_uint32
+mm_ssh_gssapi_server_ctxt(Gssctxt **ctx, gss_OID oid) {
+	Buffer m;
+	
+	/* Client doesn't get to see the context */
+ 	*ctx=NULL;
+
+	buffer_init(&m)
+  	buffer_put_string(&m,oid->elements,oid->length);
+  	
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
+
+	debug3("%s: waiting for MONITOR_ANS_GSSSIGN",__func__);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
+	major=buffer_get_int(&m);
+
+	return(major);
+}
+	
+int
+mm_answer_gss_server_ctxt(int socket, Buffer *m) {
+	gss_OID_desc oid;
+	OM_uint32 major;
+	
+	oid.elements=buffer_get_string(m,&oid.length);
+		
+	major=ssh_gssapi_server_ctxt(&gsscontext,&oid);
+
+	xfree(oid.elements);
+	
+	buffer_clear(m);
+	buffer_put_int(m,result);
+	
+	mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
+	
+	return(0);
+}
+
+OM_uint32
+mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
+			 gss_buffer_desc *out, OM_uint32 *flags) {
+
+	Buffer m;
+	OM_uint32, major;
+	
+	buffer_init(&m);
+	buffer_put_string(&m, in->value, in->length);
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
+	
+	debug3("%s: waiting for MONITOR_ANS_GSSSTEP", &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
+	
+	major=buffer_get_int(&m);
+	*out->value=buffer->get_string(&m,&out->length);
+	flags=buffer_get_int(&m);
+
+	return(major);
+}
+
+int
+mm_answer_gss_accept_ctxt(int socket, Buffer *m) {
+	gss_buffer_desc	in,out;
+	OM_uint32 major;
+	OM_uint32 flags = 0; /* GSI needs this */
+	
+	in.value = buffer_get_string(m,&in.length);
+	major=ssh_gssapi_accept_ctxt(gsscontext,&in,&out,&flags);
+	xfree(in.value);
+	
+	buffer_clear(m);
+	buffer_put_int(m, major);
+	buffer_put_string(m, out.value, out.length);
+	buffer_put_int(m, flags);
+	mm_request_send(socket,MONITOR_ANS_STEP,m);
+	
+	gss_release_buffer(out);
+	
+	return(0);
+}
+
+int
+mm_ssh_gssapi_userok(char *user) {
+	Buffer m;
+	
+	buffer_init(&m);
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
+	
+	debug3("%s: waiting for MONTIOR_ANS_GSSUSEROK", __func__);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK),
+				  &m);
+	
+	authenticated = buffer_get_int(&m);
+	
+	buffer_free(&m);
+	debug3("%s: user %sauthetnicated",__func__, authenticated ? "" : "not ");
+	return(authenticated);
+}
+
+int
+mm_answer_gss_userok(int socket, Buffer *m) {
+	authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
+	
+	buffer_clear(m);
+	buffer_put_int(m, authenticated);
+	
+	debug3("%s: sending result %d", __func__, authenticated);
+	mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
+	
+	/* Monitor loop will terminate if authenticated */
+	return(authenticated);
+}
+
+OM_uint32
+mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) {
+	Buffer m;
+	OM_uint32 major, minor;
+	
+	buffer_init(&m);
+	buffer_put_string(&m, data->value, data->length);
+	
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m);
+	
+	debug3("%s: waiting for MONITOR_ANS_GSSSIGN",__func__);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m);
+	major=buffer_get_int(&m);
+	*hash->value = buffer_get_string(&m, &hash->length);
+	
+	return(major);
+}
+	
+int
+mm_answer_gss_sign(int socket, Buffer *m) {
+	gss_buffer_desc data,hash;
+	OM_uint32 major;
+	
+	data.value = buffer_get_string(m,&data.length);
+	if (data.length != 20)
+		fatal("%s: data length incorrect: %d", __func__, datlen);
+	
+	/* Save the session ID - only first time round */
+	if (session_id2_len == 0) {
+		session_id2_len=data.length;
+		session_id2 = xmalloc(session_id2_len);
+		memcpy(session_id2, data.value, session_id2_len);
+	}
+	major=ssh_gssapi_sign(gsscontext, &data, &hash);
+	
+	xfree(data.value);
+	
+	buffer_clear(m);
+	buffer_put_int(m, major);
+	buffer_put_string(m, hash.value, hash.length);
+
+        mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
+        	
+	gss_release_buffer(hash);
+	
+	return(0);
+}
+#endif
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/kex.c src/kex.c
--- src.old/kex.c	Sat Jan 11 17:08:22 2003
+++ src/kex.c	Sat Jan 11 17:08:16 2003
@@ -42,6 +42,10 @@
 #include "dispatch.h"
 #include "monitor.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 #define KEX_COOKIE_LEN	16
 
 /* Use privilege separation for sshd */
@@ -242,6 +246,11 @@
 	case DH_GEX_SHA1:
 		kexgex(kex);
 		break;
+#ifdef GSSAPI
+	case GSS_GRP1_SHA1:
+		kexgss(kex);
+		break;
+#endif
 	default:
 		fatal("Unsupported key exchange %d", kex->kex_type);
 	}
@@ -297,11 +306,15 @@
 {
 	k->name = match_list(client, server, NULL);
 	if (k->name == NULL)
-		fatal("no kex alg");
+		fatal("No key exchange algorithm");
 	if (strcmp(k->name, KEX_DH1) == 0) {
 		k->kex_type = DH_GRP1_SHA1;
 	} else if (strcmp(k->name, KEX_DHGEX) == 0) {
 		k->kex_type = DH_GEX_SHA1;
+#ifdef GSSAPI
+	} else if (strncmp(k->name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) == 0) {
+		k->kex_type = GSS_GRP1_SHA1;
+#endif
 	} else
 		fatal("bad kex alg %s", k->name);
 }
diff -u -N --exclude configure --exclude config.h.in src.old/kex.h src/kex.h
--- src.old/kex.h	Sat Jan 11 17:08:23 2003
+++ src/kex.h	Sat Jan 11 17:08:16 2003
@@ -56,7 +56,8 @@
 
 enum kex_exchange {
 	DH_GRP1_SHA1,
-	DH_GEX_SHA1
+	DH_GEX_SHA1,
+	GSS_GRP1_SHA1
 };
 
 #define KEX_INIT_SENT	0x0001
@@ -94,6 +95,11 @@
 	Mac	mac;
 	Comp	comp;
 };
+
+struct KexOptions {
+	int	gss_deleg_creds;
+};
+
 struct Kex {
 	u_char	*session_id;
 	u_int	session_id_len;
@@ -107,11 +113,13 @@
 	Buffer	peer;
 	int	done;
 	int	flags;
+	char 	*host;
 	char	*client_version_string;
 	char	*server_version_string;
 	int	(*verify_host_key)(Key *);
 	Key	*(*load_host_key)(int);
 	int	(*host_key_index)(Key *);
+	struct  KexOptions options;
 };
 
 Kex	*kex_setup(char *[PROPOSAL_MAX]);
@@ -123,6 +131,9 @@
 
 void	 kexdh(Kex *);
 void	 kexgex(Kex *);
+#ifdef GSSAPI
+void	 kexgss(Kex *);
+#endif
 
 Newkeys *kex_get_newkeys(int);
 
diff -u -N --exclude configure --exclude config.h.in src.old/kexgss.c src/kexgss.c
--- src.old/kexgss.c	Wed Dec 31 18:00:00 1969
+++ src/kexgss.c	Sat Jan 11 17:08:16 2003
@@ -0,0 +1,450 @@
+/*
+ * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include <openssl/crypto.h>
+#include <openssl/bn.h>
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "dh.h"
+#include "ssh2.h"
+#include "ssh-gss.h"
+#include "monitor_wrap.h"
+
+/* This is now the same as the DH hash ... */
+
+u_char *
+kex_gssapi_hash(
+    char *client_version_string,
+    char *server_version_string,
+    char *ckexinit, int ckexinitlen,
+    char *skexinit, int skexinitlen,
+    u_char *serverhostkeyblob, int sbloblen,
+    BIGNUM *client_dh_pub,
+    BIGNUM *server_dh_pub,
+    BIGNUM *shared_secret)
+{
+	Buffer b;
+	static u_char digest[EVP_MAX_MD_SIZE];
+	EVP_MD *evp_md = EVP_sha1();
+	EVP_MD_CTX md;
+
+	buffer_init(&b);
+	buffer_put_string(&b, client_version_string, strlen(client_version_string));
+	buffer_put_string(&b, server_version_string, strlen(server_version_string));
+
+	/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+	buffer_put_int(&b, ckexinitlen+1);
+	buffer_put_char(&b, SSH2_MSG_KEXINIT);
+	buffer_append(&b, ckexinit, ckexinitlen);
+	buffer_put_int(&b, skexinitlen+1);
+	buffer_put_char(&b, SSH2_MSG_KEXINIT);
+	buffer_append(&b, skexinit, skexinitlen);
+
+	buffer_put_string(&b, serverhostkeyblob, sbloblen);
+	buffer_put_bignum2(&b, client_dh_pub);
+	buffer_put_bignum2(&b, server_dh_pub);
+	buffer_put_bignum2(&b, shared_secret);
+
+#ifdef DEBUG_KEX
+	buffer_dump(&b);
+#endif
+	EVP_DigestInit(&md, evp_md);
+	EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
+	EVP_DigestFinal(&md, digest, NULL);
+
+	buffer_free(&b);
+
+#ifdef DEBUG_KEX
+	dump_digest("hash", digest, evp_md->md_size);
+#endif
+	return digest;
+}
+
+void
+kexgss_client(Kex *kex)
+{
+	gss_buffer_desc gssbuf,send_tok,recv_tok, msg_tok, *token_ptr;
+	Gssctxt *ctxt;
+	OM_uint32 maj_status, min_status, ret_flags;
+	unsigned int klen, kout;
+	DH *dh; 
+	BIGNUM *dh_server_pub = 0;
+	BIGNUM *shared_secret = 0;	
+	unsigned char *kbuf;
+	unsigned char *hash;
+	unsigned char *serverhostkey;
+	int type = 0;
+	int first = 1;
+	int slen = 0;
+	
+	/* Initialise our GSSAPI world */
+	ssh_gssapi_build_ctx(&ctxt);
+	if (ssh_gssapi_id_kex(ctxt,kex->name)==NULL) {
+		fatal("Couldn't identify host exchange");
+	}
+	if (ssh_gssapi_import_name(ctxt,kex->host)) {
+		fatal("Couldn't import hostname ");
+	}
+	
+	/* This code should match that in ssh_dh1_client */
+		
+	/* Step 1 - e is dh->pub_key */
+	dh = dh_new_group1();
+	dh_gen_key(dh, kex->we_need * 8);
+
+	/* This is f, we initialise it now to make life easier */
+    	dh_server_pub = BN_new();
+    	if (dh_server_pub == NULL) {
+    		fatal("dh_server_pub == NULL");
+    	}
+    		
+	token_ptr = GSS_C_NO_BUFFER;
+			 
+	do {
+		debug("Calling gss_init_sec_context");
+		
+		maj_status=ssh_gssapi_init_ctx(ctxt,
+					       kex->options.gss_deleg_creds,
+					       token_ptr,&send_tok,
+					       &ret_flags);
+
+		if (GSS_ERROR(maj_status)) {
+			fatal("gss_init_context failed");
+		} 
+
+		/* If we've got an old receive buffer get rid of it */
+		if (token_ptr != GSS_C_NO_BUFFER)
+	  		(void) gss_release_buffer(&min_status, &recv_tok);
+ 	
+		
+		if (maj_status == GSS_S_COMPLETE) {
+			/* If mutual state flag is not true, kex fails */
+			if (!(ret_flags & GSS_C_MUTUAL_FLAG)) {
+				fatal("Mutual authentication failed");
+			}
+			/* If integ avail flag is not true kex fails */
+			if (!(ret_flags & GSS_C_INTEG_FLAG)) {
+				fatal("Integrity check failed");
+			}
+		}
+		
+		/* If we have data to send, then the last message that we
+		 * received cannot have been a 'complete'. */
+		if (send_tok.length !=0) {
+			if (first) {
+				packet_start(SSH2_MSG_KEXGSS_INIT);
+				packet_put_string(send_tok.value,
+					  	  send_tok.length);
+				packet_put_bignum2(dh->pub_key);
+				first=0;
+			} else {
+				packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+				packet_put_string(send_tok.value,
+						  send_tok.length);
+			}
+			packet_send();
+			packet_write_wait();
+
+			
+			/* If we've sent them data, they'd better be polite
+			 * and reply. */
+		
+			type = packet_read();
+			switch (type) {
+			case SSH2_MSG_KEXGSS_HOSTKEY:
+				debug("Received KEXGSS_HOSTKEY");
+				serverhostkey=packet_get_string(&slen);
+				break;
+			case SSH2_MSG_KEXGSS_CONTINUE:
+				debug("Received GSSAPI_CONTINUE");
+				if (maj_status == GSS_S_COMPLETE) 
+					fatal("GSSAPI Continue received from server when complete");
+				recv_tok.value=packet_get_string(&recv_tok.length);
+				break;
+			case SSH2_MSG_KEXGSS_COMPLETE:
+				debug("Received GSSAPI_COMPLETE");
+			        packet_get_bignum2(dh_server_pub);
+			    	msg_tok.value=
+			    	    packet_get_string(&msg_tok.length);
+
+				/* Is there a token included? */
+				if (packet_get_char()) {
+					recv_tok.value=
+					    packet_get_string(&recv_tok.length);
+					/* If we're already complete - protocol error */
+					if (maj_status == GSS_S_COMPLETE)
+						packet_disconnect("Protocol error: received token when complete");
+				} else {
+				   	/* No token included */
+				   	if (maj_status != GSS_S_COMPLETE)
+				   		packet_disconnect("Protocol error: did not receive final token");
+				}
+				break;
+			default:
+				packet_disconnect("Protocol error: didn't expect packet type %d",
+		    		type);
+			}
+			token_ptr=&recv_tok;
+		}
+
+    	} while (maj_status & GSS_S_CONTINUE_NEEDED);
+    	
+    	/* We _must_ have received a COMPLETE message in reply from the 
+    	 * server, which will have set dh_server_pub and msg_tok */
+    	 
+    	if (type!=SSH2_MSG_KEXGSS_COMPLETE)
+    	   fatal("Didn't receive a SSH2_MSG_KEXGSS_COMPLETE when I expected it");
+    	 	    	
+	/* Check f in range [1, p-1] */
+        if (!dh_pub_is_valid(dh, dh_server_pub))
+                        packet_disconnect("bad server public DH value");
+                        
+        /* compute K=f^x mod p */
+        klen = DH_size(dh);
+        kbuf = xmalloc(klen);
+        kout = DH_compute_key(kbuf, dh_server_pub, dh);
+        
+        shared_secret = BN_new();
+        BN_bin2bn(kbuf,kout, shared_secret);
+        memset(kbuf, 0, klen);
+        xfree(kbuf);
+        
+        hash = kex_gssapi_hash(
+ 	    kex->client_version_string,
+            kex->server_version_string,
+            buffer_ptr(&kex->my), buffer_len(&kex->my),
+            buffer_ptr(&kex->peer), buffer_len(&kex->peer),
+            serverhostkey, slen, /* server host key */
+            dh->pub_key,	/* e */
+            dh_server_pub,	/* f */
+            shared_secret	/* K */
+        );
+        
+        gssbuf.value=hash;
+        gssbuf.length=20;
+        
+        /* Verify that H matches the token we just got. */
+                if ((maj_status = gss_verify_mic(&min_status,
+        	       		         ctxt->context,
+        	                         &gssbuf,
+        	                         &msg_tok,
+        	                         NULL))) {
+
+		packet_disconnect("Hash's MIC didn't verify");
+      	}	
+        
+        DH_free(dh);
+       	ssh_gssapi_delete_ctx(&ctxt);
+        /* save session id */
+        if (kex->session_id == NULL) {
+        	kex->session_id_len = 20;
+        	kex->session_id = xmalloc(kex->session_id_len);
+        	memcpy(kex->session_id, hash, kex->session_id_len);
+        }
+        
+	kex_derive_keys(kex, hash, shared_secret);
+	BN_clear_free(shared_secret);
+        kex_finish(kex);
+}
+
+
+
+
+void
+kexgss_server(Kex *kex)
+{
+
+	OM_uint32 maj_status, min_status;
+	
+	/* Some GSSAPI implementations use the input value of ret_flags (an
+ 	 * output variable) as a means of triggering mechanism specific 
+ 	 * features. Initializing it to zero avoids inadvertently 
+ 	 * activating this non-standard behaviour.*/
+
+	OM_uint32 ret_flags = 0;
+	gss_buffer_desc gssbuf,send_tok,recv_tok,msg_tok;
+	Gssctxt *ctxt = NULL;
+        unsigned int klen, kout;
+        unsigned char *kbuf;
+        unsigned char *hash;
+        DH *dh;
+        BIGNUM *shared_secret = NULL;
+        BIGNUM *dh_client_pub = NULL;
+	int type =0;
+	gss_OID oid;
+	
+	/* Initialise GSSAPI */
+
+	debug2("%s: Identifying %s",__func__,kex->name);
+	oid=ssh_gssapi_id_kex(ctxt,kex->name);
+	if (oid==NULL) {
+	   fatal("Unknown gssapi mechanism");
+	}
+	
+	debug2("%s: Acquiring credentials",__func__);
+	
+	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt,oid))))
+        	fatal("Unable to acquire credentials for the server");
+                                                                                                                                
+	do {
+		debug("Wait SSH2_MSG_GSSAPI_INIT");
+		type = packet_read();
+		switch(type) {
+		case SSH2_MSG_KEXGSS_INIT:
+			if (dh_client_pub!=NULL) 
+				fatal("Received KEXGSS_INIT after initialising");
+			recv_tok.value=packet_get_string(&recv_tok.length);
+
+		        dh_client_pub = BN_new();
+		        
+		        if (dh_client_pub == NULL)
+        			fatal("dh_client_pub == NULL");
+		  	packet_get_bignum2(dh_client_pub);
+		  	
+		  	/* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
+			break;
+		case SSH2_MSG_KEXGSS_CONTINUE:
+			if (dh_client_pub == NULL)
+				fatal("Received KEXGSS_CONTINUE without initialising");
+			recv_tok.value=packet_get_string(&recv_tok.length);
+			break;
+		default:
+			packet_disconnect("Protocol error: didn't expect packet type %d",
+					   type);
+		}
+		
+		maj_status=PRIVSEP(ssh_gssapi_accept_ctx(ctxt,&recv_tok, 
+							 &send_tok, &ret_flags));
+
+		gss_release_buffer(&min_status,&recv_tok);
+		
+		if (maj_status & GSS_S_CONTINUE_NEEDED) {
+			debug("Sending GSSAPI_CONTINUE");
+			packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+			packet_put_string(send_tok.value,send_tok.length);
+			packet_send();
+			packet_write_wait();
+			gss_release_buffer(&min_status, &send_tok);
+		}
+	} while (maj_status & GSS_S_CONTINUE_NEEDED);
+
+	if (GSS_ERROR(maj_status))
+		fatal("gss_accept_context died");
+	
+	debug("gss_complete");
+	if (!(ret_flags & GSS_C_MUTUAL_FLAG))
+		fatal("mutual authentication flag wasn't set");
+		
+	if (!(ret_flags & GSS_C_INTEG_FLAG))
+		fatal("Integrity flag wasn't set");
+			
+	dh = dh_new_group1();
+	dh_gen_key(dh, kex->we_need * 8);
+	
+        if (!dh_pub_is_valid(dh, dh_client_pub))
+                packet_disconnect("bad client public DH value");
+
+        klen = DH_size(dh);
+        kbuf = xmalloc(klen); 
+        kout = DH_compute_key(kbuf, dh_client_pub, dh);
+
+	shared_secret = BN_new();
+	BN_bin2bn(kbuf, kout, shared_secret);
+	memset(kbuf, 0, klen);
+	xfree(kbuf);
+	
+        hash = kex_gssapi_hash(
+            kex->client_version_string,
+            kex->server_version_string,
+            buffer_ptr(&kex->peer), buffer_len(&kex->peer),
+            buffer_ptr(&kex->my), buffer_len(&kex->my),
+            NULL, 0, /* Change this if we start sending host keys */
+            dh_client_pub,
+            dh->pub_key,
+            shared_secret
+	);
+	BN_free(dh_client_pub);
+		
+	if (kex->session_id == NULL) {
+		kex->session_id_len = 20;
+		kex->session_id = xmalloc(kex->session_id_len);
+		memcpy(kex->session_id, hash, kex->session_id_len);
+	}
+	                        
+	gssbuf.value = hash;
+	gssbuf.length = 20; /* Hashlen appears to always be 20 */
+	
+	if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt,&gssbuf,&msg_tok))))
+		fatal("Couldn't get MIC");
+	
+	packet_start(SSH2_MSG_KEXGSS_COMPLETE);
+	packet_put_bignum2(dh->pub_key);
+	packet_put_string((char *)msg_tok.value,msg_tok.length);
+
+	if (send_tok.length!=0) {
+		packet_put_char(1); /* true */
+		packet_put_string((char *)send_tok.value,send_tok.length);
+	} else {
+		packet_put_char(0); /* false */
+	}
+ 	packet_send();
+	packet_write_wait();
+
+        /* We used to store the client name and credentials here for later
+         * use. With privsep, its easier to do this as a by product of the
+         * call to accept_context, which stores delegated information when
+         * the context is complete */
+         
+	gss_release_buffer(&min_status, &send_tok);	
+
+	/* If we've got a context, delete it. It may be NULL if we've been
+	 * using privsep */
+	ssh_gssapi_delete_ctx(&ctxt);
+	
+	DH_free(dh);
+
+	kex_derive_keys(kex, hash, shared_secret);
+	BN_clear_free(shared_secret);
+	kex_finish(kex);
+}
+
+void 
+kexgss(Kex *kex)
+{
+	if (kex->server)
+		kexgss_server(kex);
+	else
+		kexgss_client(kex);
+}
+
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/key.c src/key.c
--- src.old/key.c	Sat Jan 11 17:08:23 2003
+++ src/key.c	Sat Jan 11 17:08:16 2003
@@ -648,6 +648,8 @@
 		return KEY_RSA;
 	} else if (strcmp(name, "ssh-dss") == 0) {
 		return KEY_DSA;
+	} else if (strcmp(name, "null") == 0) {
+		return KEY_NULL;
 	}
 	debug2("key_type_from_name: unknown key type '%s'", name);
 	return KEY_UNSPEC;
diff -u -N --exclude configure --exclude config.h.in src.old/key.h src/key.h
--- src.old/key.h	Sat Jan 11 17:08:23 2003
+++ src/key.h	Sat Jan 11 17:08:16 2003
@@ -34,6 +34,7 @@
 	KEY_RSA1,
 	KEY_RSA,
 	KEY_DSA,
+	KEY_NULL,
 	KEY_UNSPEC
 };
 enum fp_type {
diff -u -N --exclude configure --exclude config.h.in src.old/log.c src/log.c
--- src.old/log.c	Sat Jan 11 17:08:23 2003
+++ src/log.c	Sat Jan 11 17:08:17 2003
@@ -387,7 +387,7 @@
 		vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
 	}
 	if (log_on_stderr) {
-		fprintf(stderr, "%s\r\n", msgbuf);
+		fprintf(stderr, "%d: %s\r\n", getpid(), msgbuf);
 	} else {
 		openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
 		syslog(pri, "%.500s", msgbuf);
diff -u -N --exclude configure --exclude config.h.in src.old/makegssname.pl src/makegssname.pl
--- src.old/makegssname.pl	Wed Dec 31 18:00:00 1969
+++ src/makegssname.pl	Sat Jan 11 17:08:17 2003
@@ -0,0 +1,46 @@
+#!/usr/bin/perl
+
+use Convert::ASN1 qw(:tag);
+use Digest::MD5 qw(md5);
+use MIME::Base64;
+ 
+$oid=shift;
+$encoded=encode_object_id($oid);
+
+@entries=unpack("C*",$encoded);
+shift @entries; # Get rid of the NULL
+
+print "DER representation: ";
+foreach $entry (@entries) {
+  print "\\x";
+  printf "%02X",$entry;
+}
+print "\n";
+
+$digest = md5($encoded);
+# We only want the first 10 characters;
+# Conversations with the authors suggest that we want to use all of the
+# characters of the digest.
+#$digest = substr($digest,0,10);
+print "gsskeyex representation: ",encode_base64($digest),"\n";
+
+sub encode_object_id {
+  $string="";
+
+  my @data = ($_[0] =~ /(\d+)/g);
+
+  if(@data < 2) {
+      @data = (0);
+  }
+  else {
+      my $first = $data[1] + ($data[0] * 40);
+      splice(@data,0,2,$first);
+  }
+
+#  my $l = length $string;
+  $string .= pack("cw*", 0, @data);
+#  substr($string,$l,1) = asn_encode_length(length($string) - $l - 1);
+  return $string;
+}
+
+
diff -u -N --exclude configure --exclude config.h.in src.old/monitor.c src/monitor.c
--- src.old/monitor.c	Sat Jan 11 17:08:24 2003
+++ src/monitor.c	Sat Jan 11 17:08:17 2003
@@ -59,6 +59,11 @@
 #include "ssh2.h"
 #include "mpaux.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+static Gssctxt *gsscontext = NULL;
+#endif
+
 /* Imports */
 extern ServerOptions options;
 extern u_int utmp_len;
@@ -127,6 +132,13 @@
 int mm_answer_krb5(int, Buffer *);
 #endif
 
+#ifdef GSSAPI
+int mm_answer_gss_setup_ctx(int, Buffer *);
+int mm_answer_gss_accept_ctx(int, Buffer *);
+int mm_answer_gss_userok(int, Buffer *);
+int mm_answer_gss_sign(int, Buffer *);
+#endif
+
 static Authctxt *authctxt;
 static BIGNUM *ssh1_challenge = NULL;	/* used for ssh1 rsa auth */
 
@@ -172,12 +184,23 @@
     {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
     {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
 #endif
+#ifdef GSSAPI
+    {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
+    {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
+    {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
+    {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
+#endif
     {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
     {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
     {0, 0, NULL}
 };
 
 struct mon_table mon_dispatch_postauth20[] = {
+#ifdef GSSAPI
+    {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
+    {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
+    {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
+#endif
     {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
     {MONITOR_REQ_SIGN, 0, mm_answer_sign},
     {MONITOR_REQ_PTY, 0, mm_answer_pty},
@@ -267,6 +290,12 @@
 		/* Permit requests for moduli and signatures */
 		monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
 		monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
+#ifdef GSSAPI
+		/* and for the GSSAPI key exchange */
+		monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
+		monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
+		monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
+#endif
 	} else {
 		mon_dispatch = mon_dispatch_proto15;
 
@@ -1638,3 +1667,96 @@
 	mon->m_recvfd = pair[0];
 	mon->m_sendfd = pair[1];
 }
+
+#ifdef GSSAPI
+
+int
+mm_answer_gss_setup_ctx(int socket, Buffer *m) {
+        gss_OID_desc oid;
+        OM_uint32 major;
+
+        oid.elements=buffer_get_string(m,&oid.length);
+                
+        major=ssh_gssapi_server_ctx(&gsscontext,&oid);
+
+        xfree(oid.elements);
+
+        buffer_clear(m);
+        buffer_put_int(m,major);
+
+        mm_request_send(socket,MONITOR_ANS_GSSSETUP,m);
+
+        return(0);
+}
+
+int
+mm_answer_gss_accept_ctx(int socket, Buffer *m) {
+        gss_buffer_desc in,out;
+        OM_uint32 major,minor;
+        OM_uint32 flags = 0; /* GSI needs this */
+
+        in.value = buffer_get_string(m,&in.length);
+        major=ssh_gssapi_accept_ctx(gsscontext,&in,&out,&flags);
+        xfree(in.value);
+
+        buffer_clear(m);
+        buffer_put_int(m, major);
+        buffer_put_string(m, out.value, out.length);
+        buffer_put_int(m, flags);
+        mm_request_send(socket,MONITOR_ANS_GSSSTEP,m);
+
+        gss_release_buffer(&minor, &out);
+
+        return(0);
+}
+int
+mm_answer_gss_userok(int socket, Buffer *m) {
+	int authenticated;
+
+        authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
+
+        buffer_clear(m);
+        buffer_put_int(m, authenticated);
+
+        debug3("%s: sending result %d", __func__, authenticated);
+        mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
+
+	auth_method="gssapi";
+	
+        /* Monitor loop will terminate if authenticated */
+        return(authenticated);
+}
+int
+mm_answer_gss_sign(int socket, Buffer *m) {
+        gss_buffer_desc data,hash;
+        OM_uint32 major,minor;
+
+        data.value = buffer_get_string(m,&data.length);
+        if (data.length != 20)
+                fatal("%s: data length incorrect: %d", __func__, data.length);
+
+        /* Save the session ID - only first time round */
+        if (session_id2_len == 0) {
+                session_id2_len=data.length;
+                session_id2 = xmalloc(session_id2_len);
+                memcpy(session_id2, data.value, session_id2_len);
+        }
+        major=ssh_gssapi_sign(gsscontext, &data, &hash);
+
+        xfree(data.value);
+
+        buffer_clear(m);
+        buffer_put_int(m, major);
+        buffer_put_string(m, hash.value, hash.length);
+
+        mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
+
+        gss_release_buffer(&minor,&hash);
+
+	/* Turn on permissions for getpwnam */
+	monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
+	
+        return(0);
+}
+
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/monitor.h src/monitor.h
--- src.old/monitor.h	Sat Jan 11 17:08:24 2003
+++ src/monitor.h	Sat Jan 11 17:08:17 2003
@@ -39,6 +39,10 @@
 	MONITOR_REQ_BSDAUTHRESPOND, MONITOR_ANS_BSDAUTHRESPOND,
 	MONITOR_REQ_SKEYQUERY, MONITOR_ANS_SKEYQUERY,
 	MONITOR_REQ_SKEYRESPOND, MONITOR_ANS_SKEYRESPOND,
+	MONITOR_REQ_GSSSETUP,MONITOR_ANS_GSSSETUP,
+	MONITOR_REQ_GSSSTEP,MONITOR_ANS_GSSSTEP,
+	MONITOR_REQ_GSSSIGN,MONITOR_ANS_GSSSIGN,
+	MONITOR_REQ_GSSUSEROK,MONITOR_ANS_GSSUSEROK,
 	MONITOR_REQ_KEYALLOWED, MONITOR_ANS_KEYALLOWED,
 	MONITOR_REQ_KEYVERIFY, MONITOR_ANS_KEYVERIFY,
 	MONITOR_REQ_KEYEXPORT,
diff -u -N --exclude configure --exclude config.h.in src.old/monitor_wrap.c src/monitor_wrap.c
--- src.old/monitor_wrap.c	Sat Jan 11 17:08:24 2003
+++ src/monitor_wrap.c	Sat Jan 11 17:08:18 2003
@@ -51,6 +51,10 @@
 #include "channels.h"
 #include "session.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 /* Imports */
 extern int compat20;
 extern Newkeys *newkeys[];
@@ -1007,3 +1011,82 @@
 	return (success);
 }
 #endif
+#ifdef GSSAPI
+OM_uint32
+mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) {
+        Buffer m;
+        OM_uint32 major;
+                
+        /* Client doesn't get to see the context */
+        *ctx=NULL;
+
+        buffer_init(&m);
+        buffer_put_string(&m,oid->elements,oid->length);
+
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
+
+        debug3("%s: waiting for MONITOR_ANS_GSSSETUP",__func__);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
+        major=buffer_get_int(&m);
+
+        return(major);
+}
+
+OM_uint32
+mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
+                         gss_buffer_desc *out, OM_uint32 *flags) {
+
+        Buffer m;
+        OM_uint32 major;
+
+        buffer_init(&m);
+        buffer_put_string(&m, in->value, in->length);
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
+
+        debug3("%s: waiting for MONITOR_ANS_GSSSTEP", __func__);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
+
+        major=buffer_get_int(&m);
+        out->value=buffer_get_string(&m,&out->length);
+        if (flags) *flags=buffer_get_int(&m);
+
+        return(major);
+}
+
+int
+mm_ssh_gssapi_userok(char *user) {
+        Buffer m;
+        int authenticated = 0;
+
+        buffer_init(&m);
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
+
+        debug3("%s: waiting for MONTIOR_ANS_GSSUSEROK", __func__);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
+                                  &m);
+
+        authenticated = buffer_get_int(&m);
+
+        buffer_free(&m);
+        debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
+        return(authenticated);
+}
+
+OM_uint32
+mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) {
+        Buffer m;
+        OM_uint32 major;
+
+        buffer_init(&m);
+        buffer_put_string(&m, data->value, data->length);
+
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m);
+
+        debug3("%s: waiting for MONITOR_ANS_GSSSIGN",__func__);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m);
+        major=buffer_get_int(&m);
+        hash->value = buffer_get_string(&m, &hash->length);
+
+        return(major);
+}
+#endif /* GSSAPI */
diff -u -N --exclude configure --exclude config.h.in src.old/monitor_wrap.h src/monitor_wrap.h
--- src.old/monitor_wrap.h	Sat Jan 11 17:08:24 2003
+++ src/monitor_wrap.h	Sat Jan 11 17:08:18 2003
@@ -59,6 +59,16 @@
 void mm_start_pam(char *);
 #endif
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+OM_uint32 mm_ssh_gssapi_server_ctx(Gssctxt **ctxt, gss_OID oid);
+OM_uint32 mm_ssh_gssapi_accept_ctx(Gssctxt *ctxt, gss_buffer_desc *recv,
+				   gss_buffer_desc *send, OM_uint32 *flags);
+OM_uint32 mm_ssh_gssapi_sign(Gssctxt *ctxt, gss_buffer_desc *buffer,
+			     gss_buffer_desc *hash);
+int mm_ssh_gssapi_userok(char *user);
+#endif
+
 void mm_terminate(void);
 int mm_pty_allocate(int *, int *, char *, int);
 void mm_session_pty_cleanup2(void *);
diff -u -N --exclude configure --exclude config.h.in src.old/readconf.c src/readconf.c
--- src.old/readconf.c	Sat Jan 11 17:08:25 2003
+++ src/readconf.c	Sat Jan 11 17:08:18 2003
@@ -97,6 +97,12 @@
 #if defined(KRB4) || defined(KRB5)
 	oKerberosAuthentication,
 #endif
+#ifdef GSSAPI
+	oGssAuthentication, oGssDelegateCreds,
+#ifdef GSI
+	oGssGlobusDelegateLimitedCreds,
+#endif /* GSI */
+#endif /* GSSAPI */
 #if defined(AFS) || defined(KRB5)
 	oKerberosTgtPassing,
 #endif
@@ -143,6 +149,15 @@
 #if defined(KRB4) || defined(KRB5)
 	{ "kerberosauthentication", oKerberosAuthentication },
 #endif
+#ifdef GSSAPI
+	{ "gssapiauthentication", oGssAuthentication },
+	{ "gssapidelegatecredentials", oGssDelegateCreds },
+#ifdef GSI
+	/* For backwards compatability with old 1.2.27 client code */
+	{ "forwardgssapiglobusproxy", oGssDelegateCreds }, /* alias */
+	{ "forwardgssapiglobuslimitedproxy", oGssGlobusDelegateLimitedCreds },
+#endif /* GSI */
+#endif /* GSSAPI */
 #if defined(AFS) || defined(KRB5)
 	{ "kerberostgtpassing", oKerberosTgtPassing },
 #endif
@@ -362,6 +377,19 @@
 		intptr = &options->kerberos_authentication;
 		goto parse_flag;
 #endif
+#ifdef GSSAPI
+	case oGssAuthentication:
+		intptr = &options->gss_authentication;
+		goto parse_flag;
+	case oGssDelegateCreds:
+		intptr = &options->gss_deleg_creds;
+		goto parse_flag;
+#ifdef GSI
+	case oGssGlobusDelegateLimitedCreds:
+		intptr = &options->gss_globus_deleg_limited_proxy;
+		goto parse_flag;
+#endif /* GSI */
+#endif /* GSSAPI */
 #if defined(AFS) || defined(KRB5)
 	case oKerberosTgtPassing:
 		intptr = &options->kerberos_tgt_passing;
@@ -747,6 +775,13 @@
 	options->rsa_authentication = -1;
 	options->pubkey_authentication = -1;
 	options->challenge_response_authentication = -1;
+#ifdef GSSAPI
+        options->gss_authentication = -1;
+        options->gss_deleg_creds = -1;
+#ifdef GSI
+        options->gss_globus_deleg_limited_proxy = -1;
+#endif /* GSI */
+#endif /* GSSAPI */
 #if defined(KRB4) || defined(KRB5)
 	options->kerberos_authentication = -1;
 #endif
@@ -823,6 +858,16 @@
 		options->pubkey_authentication = 1;
 	if (options->challenge_response_authentication == -1)
 		options->challenge_response_authentication = 1;
+#ifdef GSSAPI
+	if (options->gss_authentication == -1)
+		options->gss_authentication = 1;
+	if (options->gss_deleg_creds == -1)
+		options->gss_deleg_creds = 1;
+#ifdef GSI
+	if (options->gss_globus_deleg_limited_proxy == -1)
+		options->gss_globus_deleg_limited_proxy = 0;
+#endif /* GSI */
+#endif /* GSSAPI */
 #if defined(KRB4) || defined(KRB5)
 	if (options->kerberos_authentication == -1)
 		options->kerberos_authentication = 1;
diff -u -N --exclude configure --exclude config.h.in src.old/readconf.h src/readconf.h
--- src.old/readconf.h	Sat Jan 11 17:08:25 2003
+++ src/readconf.h	Sat Jan 11 17:08:18 2003
@@ -47,6 +47,15 @@
 #if defined(AFS) || defined(KRB5)
 	int     kerberos_tgt_passing;	/* Try Kerberos TGT passing. */
 #endif
+
+#ifdef GSSAPI
+	int 	gss_authentication;
+	int	gss_deleg_creds;
+#ifdef GSI
+	int	gss_globus_deleg_limited_proxy;
+#endif /* GSI */
+#endif /* GSSAPI */
+
 #ifdef AFS
 	int     afs_token_passing;	/* Try AFS token passing. */
 #endif
diff -u -N --exclude configure --exclude config.h.in src.old/servconf.c src/servconf.c
--- src.old/servconf.c	Sat Jan 11 17:08:25 2003
+++ src/servconf.c	Sat Jan 11 17:08:18 2003
@@ -86,6 +86,12 @@
 	options->hostbased_uses_name_from_packet_only = -1;
 	options->rsa_authentication = -1;
 	options->pubkey_authentication = -1;
+#ifdef GSSAPI
+	options->gss_authentication=-1;
+	options->gss_keyex=-1;
+	options->gss_use_session_ccache = -1;
+	options->gss_cleanup_creds = -1;
+#endif
 #if defined(KRB4) || defined(KRB5)
 	options->kerberos_authentication = -1;
 	options->kerberos_or_local_passwd = -1;
@@ -200,6 +206,16 @@
 		options->rsa_authentication = 1;
 	if (options->pubkey_authentication == -1)
 		options->pubkey_authentication = 1;
+#ifdef GSSAPI
+	if (options->gss_authentication == -1)
+		options->gss_authentication = 1;
+	if (options->gss_keyex == -1)
+		options->gss_keyex =1;
+	if (options->gss_use_session_ccache == -1)
+		options->gss_use_session_ccache = 1;
+	if (options->gss_cleanup_creds == -1)
+		options->gss_cleanup_creds = 1;
+#endif
 #if defined(KRB4) || defined(KRB5)
 	if (options->kerberos_authentication == -1)
 		options->kerberos_authentication = 0;
@@ -280,6 +296,9 @@
 	sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
 	sPermitRootLogin, sLogFacility, sLogLevel,
 	sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
+#ifdef GSSAPI
+	sGssAuthentication, sGssKeyEx, sGssUseSessionCredCache, sGssCleanupCreds,
+#endif
 #if defined(KRB4) || defined(KRB5)
 	sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
 #endif
@@ -330,6 +349,13 @@
 	{ "rsaauthentication", sRSAAuthentication },
 	{ "pubkeyauthentication", sPubkeyAuthentication },
 	{ "dsaauthentication", sPubkeyAuthentication },			/* alias */
+#ifdef GSSAPI
+	{ "gssapiauthentication", sGssAuthentication },
+	{ "gssapikeyexchange", sGssKeyEx },
+	{ "gssusesessionccache", sGssUseSessionCredCache },
+	{ "gssapiusesessioncredcache", sGssUseSessionCredCache },
+	{ "gssapicleanupcreds", sGssCleanupCreds },
+#endif
 #if defined(KRB4) || defined(KRB5)
 	{ "kerberosauthentication", sKerberosAuthentication },
 	{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
@@ -645,6 +671,20 @@
 	case sPubkeyAuthentication:
 		intptr = &options->pubkey_authentication;
 		goto parse_flag;
+#ifdef GSSAPI
+	case sGssAuthentication:
+		intptr = &options->gss_authentication;
+		goto parse_flag;
+	case sGssKeyEx:
+		intptr = &options->gss_keyex;
+		goto parse_flag;
+	case sGssUseSessionCredCache:
+		intptr = &options->gss_use_session_ccache;
+		goto parse_flag;
+	case sGssCleanupCreds:
+		intptr = &options->gss_cleanup_creds;
+		goto parse_flag;
+#endif
 #if defined(KRB4) || defined(KRB5)
 	case sKerberosAuthentication:
 		intptr = &options->kerberos_authentication;
diff -u -N --exclude configure --exclude config.h.in src.old/servconf.h src/servconf.h
--- src.old/servconf.h	Sat Jan 11 17:08:25 2003
+++ src/servconf.h	Sat Jan 11 17:08:19 2003
@@ -73,6 +73,13 @@
 	int     hostbased_uses_name_from_packet_only; /* experimental */
 	int     rsa_authentication;	/* If true, permit RSA authentication. */
 	int     pubkey_authentication;	/* If true, permit ssh2 pubkey authentication. */
+#ifdef GSSAPI
+	int     gss_authentication;
+	int     gss_keyex;
+	int     gss_use_session_ccache;        /* If true, delegated credentials are
+	                                        * stored in a session specific cache */
+	int 	gss_cleanup_creds;	       /* If true, destroy cred cache on logout */
+#endif	
 #if defined(KRB4) || defined(KRB5)
 	int     kerberos_authentication;	/* If true, permit Kerberos
 						 * authentication. */
diff -u -N --exclude configure --exclude config.h.in src.old/session.c src/session.c
--- src.old/session.c	Sat Jan 11 17:08:25 2003
+++ src/session.c	Sat Jan 11 17:08:19 2003
@@ -58,6 +58,10 @@
 #include "session.h"
 #include "monitor_wrap.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 #ifdef HAVE_CYGWIN
 #include <windows.h>
 #include <sys/cygwin.h>
@@ -453,6 +457,12 @@
 
 	session_proctitle(s);
 
+#if defined(GSSAPI)
+	temporarily_use_uid(s->pw);
+	ssh_gssapi_storecreds();
+	restore_uid();
+#endif
+
 #if defined(USE_PAM)
 	do_pam_session(s->pw->pw_name, NULL);
 	do_pam_setcred(1);
@@ -580,6 +590,12 @@
 	ptyfd = s->ptyfd;
 	ttyfd = s->ttyfd;
 
+#if defined(GSSAPI)
+	temporarily_use_uid(s->pw);
+	ssh_gssapi_storecreds();
+	restore_uid();
+#endif
+
 #if defined(USE_PAM)
 	do_pam_session(s->pw->pw_name, s->tty);
 	do_pam_setcred(1);
@@ -838,7 +854,7 @@
  * Sets the value of the given variable in the environment.  If the variable
  * already exists, its value is overriden.
  */
-static void
+void
 child_set_env(char ***envp, u_int *envsizep, const char *name,
 	const char *value)
 {
@@ -965,6 +981,13 @@
 	copy_environment(environ, &env, &envsize);
 #endif
 
+#ifdef GSSAPI
+	/* Allow any GSSAPI methods that we've used to alter 
+	 * the childs environment as they see fit
+	 */
+	ssh_gssapi_do_child(&env,&envsize);
+#endif
+
 	if (!options.use_login) {
 		/* Set basic environment. */
 		child_set_env(&env, &envsize, "USER", pw->pw_name);
@@ -2092,4 +2115,7 @@
 do_authenticated2(Authctxt *authctxt)
 {
 	server_loop2(authctxt);
+#if defined(GSSAPI)
+	ssh_gssapi_cleanup_creds(NULL);
+#endif
 }
diff -u -N --exclude configure --exclude config.h.in src.old/session.h src/session.h
--- src.old/session.h	Sat Jan 11 17:08:25 2003
+++ src/session.h	Sat Jan 11 17:08:19 2003
@@ -68,4 +68,7 @@
 Session	*session_by_tty(char *);
 void	 session_close(Session *);
 void	 do_setusercontext(struct passwd *);
+
+void	 child_set_env(char ***envp, u_int *envsizep, const char *name,
+		       const char *value);
 #endif
diff -u -N --exclude configure --exclude config.h.in src.old/ssh-gss.h src/ssh-gss.h
--- src.old/ssh-gss.h	Wed Dec 31 18:00:00 1969
+++ src/ssh-gss.h	Sat Jan 11 17:08:19 2003
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SSH_GSS_H
+#define _SSH_GSS_H
+
+#ifdef GSSAPI
+
+#include "kex.h"
+#include "buffer.h"
+
+#include <gssapi.h>
+
+#ifdef KRB5
+#ifndef HEIMDAL
+#include <gssapi_generic.h>
+
+/* MIT Kerberos doesn't seem to define GSS_NT_HOSTBASED_SERVICE */
+
+#ifndef GSS_C_NT_HOSTBASED_SERVICE
+#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
+#endif /* GSS_C_NT_... */
+#endif /* !HEIMDAL */
+#endif /* KRB5 */
+
+/* draft-ietf-secsh-gsskeyex-03 */
+#define SSH2_MSG_KEXGSS_INIT				30
+#define SSH2_MSG_KEXGSS_CONTINUE 			31
+#define SSH2_MSG_KEXGSS_COMPLETE 			32
+#define SSH2_MSG_KEXGSS_HOSTKEY				33
+#define SSH2_MSG_KEXGSS_ERROR				34
+#define SSH2_MSG_USERAUTH_GSSAPI_RESPONSE     		60
+#define SSH2_MSG_USERAUTH_GSSAPI_TOKEN        		61
+#define SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE	63    
+#define SSH2_MSG_USERAUTH_GSSAPI_ERROR			64  
+
+#define KEX_GSS_SHA1					"gss-group1-sha1-"
+
+enum ssh_gss_id {
+#ifdef KRB5
+	GSS_KERBEROS,
+#endif
+#ifdef GSI
+	GSS_GSI,
+#endif /* GSI */
+	GSS_LAST_ENTRY
+};
+
+typedef struct ssh_gss_mech_struct {
+        char *enc_name;
+        char *name;
+        gss_OID_desc oid;
+} ssh_gssapi_mech;
+
+typedef struct {
+	OM_uint32	status; /* both */
+	gss_ctx_id_t	context; /* both */
+	gss_name_t	name; /* both */
+	gss_OID		oid; /* client */
+	gss_cred_id_t	creds; /* server */
+	gss_name_t	client; /* server */
+	gss_cred_id_t	client_creds; /* server */
+} Gssctxt;
+
+extern ssh_gssapi_mech supported_mechs[];
+extern gss_buffer_desc gssapi_client_name;
+extern gss_cred_id_t   gssapi_client_creds;
+extern enum ssh_gss_id gssapi_client_type;
+
+char *ssh_gssapi_mechanisms(int server, char *host);
+gss_OID ssh_gssapi_id_kex(Gssctxt *ctx, char *name);
+void ssh_gssapi_set_oid_data(Gssctxt *ctx, void *data, size_t len);
+void ssh_gssapi_set_oid(Gssctxt *ctx, gss_OID oid);
+void ssh_gssapi_supported_oids(gss_OID_set *oidset);
+enum ssh_gss_id ssh_gssapi_get_ctype(Gssctxt *ctxt);
+
+OM_uint32 ssh_gssapi_import_name(Gssctxt *ctx, const char *host);
+OM_uint32 ssh_gssapi_acquire_cred(Gssctxt *ctx);
+OM_uint32 ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds,
+			      gss_buffer_desc *recv_tok, 
+			      gss_buffer_desc *send_tok, OM_uint32 *flags);
+OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx,
+				gss_buffer_desc *recv_tok,
+				gss_buffer_desc *send_tok,
+				OM_uint32 *flags);
+OM_uint32 ssh_gssapi_getclient(Gssctxt *ctx,
+				enum ssh_gss_id *type,
+				gss_buffer_desc *name,
+				gss_cred_id_t *creds);
+void ssh_gssapi_error(OM_uint32 major_status,OM_uint32 minor_status);
+void ssh_gssapi_build_ctx(Gssctxt **ctx);
+void ssh_gssapi_delete_ctx(Gssctxt **ctx);
+OM_uint32 ssh_gssapi_client_ctx(Gssctxt **ctx,gss_OID oid,char *host);
+OM_uint32 ssh_gssapi_server_ctx(Gssctxt **ctx,gss_OID oid);
+
+/* In the client */
+void ssh_gssapi_client(Kex *kex, char *host, struct sockaddr *hostaddr,
+                       Buffer *client_kexinit, Buffer *server_kexinit);
+
+/* In the server */
+int ssh_gssapi_userok(char *name);
+void ssh_gssapi_server(Kex *kex, Buffer *client_kexinit, 
+		       Buffer *server_kexinit);
+
+OM_uint32 ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *buffer, 
+					gss_buffer_desc *hash);
+
+void ssh_gssapi_do_child(char ***envp, u_int *envsizep);                 
+void ssh_gssapi_cleanup_creds(void *ignored);
+void ssh_gssapi_storecreds();
+#endif /* GSSAPI */
+
+#endif /* _SSH_GSS_H */
diff -u -N --exclude configure --exclude config.h.in src.old/sshconnect2.c src/sshconnect2.c
--- src.old/sshconnect2.c	Sat Jan 11 17:08:26 2003
+++ src/sshconnect2.c	Sat Jan 11 17:08:19 2003
@@ -48,6 +48,10 @@
 #include "msg.h"
 #include "pathnames.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 /* import */
 extern char *client_version_string;
 extern char *server_version_string;
@@ -77,10 +81,26 @@
 ssh_kex2(char *host, struct sockaddr *hostaddr)
 {
 	Kex *kex;
+#ifdef GSSAPI
+	char *orig, *gss;
+	int len;
+#endif
 
 	xxx_host = host;
 	xxx_hostaddr = hostaddr;
 
+#ifdef GSSAPI
+	/* Add the GSSAPI mechanisms currently supported on this client to
+	 * the key exchange algorithm proposal */
+	orig = myproposal[PROPOSAL_KEX_ALGS];
+	gss = ssh_gssapi_mechanisms(0,host);
+	if (gss) {
+	   len = strlen(orig)+strlen(gss)+2;
+	   myproposal[PROPOSAL_KEX_ALGS]=xmalloc(len);
+	   snprintf(myproposal[PROPOSAL_KEX_ALGS],len,"%s,%s",gss,orig);
+	}
+#endif
+
 	if (options.ciphers == (char *)-1) {
 		log("No valid ciphers for protocol version 2 given, using defaults.");
 		options.ciphers = NULL;
@@ -108,11 +128,27 @@
 		myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
 		    options.hostkeyalgorithms;
 
+#ifdef GSSAPI
+        /* If we've got GSSAPI algorithms, then we also support the
+         * 'null' hostkey, as a last resort */
+	if (gss) {
+		orig=myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS];
+		len = strlen(orig)+sizeof(",null");
+		myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]=xmalloc(len);
+		snprintf(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],len,"%s,null",orig);  
+	}
+#endif
+
 	/* start key exchange */
 	kex = kex_setup(myproposal);
 	kex->client_version_string=client_version_string;
 	kex->server_version_string=server_version_string;
 	kex->verify_host_key=&verify_host_key_callback;
+	kex->host=host;
+
+#ifdef GSSAPI
+	kex->options.gss_deleg_creds=options.gss_deleg_creds;
+#endif
 
 	xxx_kex = kex;
 
@@ -159,6 +195,8 @@
 	Sensitive *sensitive;
 	/* kbd-interactive */
 	int info_req_seen;
+	/* generic */
+	void *methoddata;
 };
 struct Authmethod {
 	char	*name;		/* string to compare against server's list */
@@ -181,6 +219,14 @@
 int	userauth_kbdint(Authctxt *);
 int	userauth_hostbased(Authctxt *);
 
+#ifdef GSSAPI
+int	userauth_external(Authctxt *authctxt);
+int	userauth_gssapi(Authctxt *authctxt);
+void	input_gssapi_response(int type, u_int32_t plen, void *ctxt);
+void	input_gssapi_token(int type, u_int32_t plen, void *ctxt);
+void	input_gssapi_hash(int type, u_int32_t plen, void *ctxt);
+#endif
+
 void	userauth(Authctxt *, char *);
 
 static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *);
@@ -191,6 +237,16 @@
 static char *authmethods_get(void);
 
 Authmethod authmethods[] = {
+#ifdef GSSAPI
+	{"external-keyx",
+		userauth_external,
+		&options.gss_authentication,
+		NULL},
+	{"gssapi",
+		userauth_gssapi,
+		&options.gss_authentication,
+		NULL},
+#endif
 	{"hostbased",
 		userauth_hostbased,
 		&options.hostbased_authentication,
@@ -256,6 +312,7 @@
 	authctxt.success = 0;
 	authctxt.method = authmethod_lookup("none");
 	authctxt.authlist = NULL;
+	authctxt.methoddata = NULL;
 	authctxt.sensitive = sensitive;
 	authctxt.info_req_seen = 0;
 	if (authctxt.method == NULL)
@@ -278,6 +335,11 @@
 void
 userauth(Authctxt *authctxt, char *authlist)
 {
+	if (authctxt->methoddata!=NULL) {
+		xfree(authctxt->methoddata);
+		authctxt->methoddata=NULL;
+	}
+
 	if (authlist == NULL) {
 		authlist = authctxt->authlist;
 	} else {
@@ -327,6 +389,8 @@
 		fatal("input_userauth_success: no authentication context");
 	if (authctxt->authlist)
 		xfree(authctxt->authlist);
+	if (authctxt->methoddata)
+		xfree(authctxt->methoddata);
 	clear_auth_state(authctxt);
 	authctxt->success = 1;			/* break out */
 }
@@ -427,6 +491,153 @@
 		userauth(authctxt, NULL);
 
 }
+
+#ifdef GSSAPI
+int 
+userauth_gssapi(Authctxt *authctxt)
+{
+	int i;
+	Gssctxt *gssctxt;
+	static int tries=0;
+
+	/* For now, we only make one attempt at this. We could try offering
+	 * the server different GSSAPI OIDs until we get bored, I suppose.
+	 */	
+	if (tries++>0) return 0;
+
+	if (datafellows & SSH_OLD_GSSAPI) return 0;
+	
+	/* Initialise as much of our context as we can, so failures can be
+	 * trapped before sending any packets.
+	 */
+	ssh_gssapi_build_ctx(&gssctxt);
+
+	if (ssh_gssapi_import_name(gssctxt,authctxt->host)) {
+		return(0);
+	}
+	
+	authctxt->methoddata=(void *)gssctxt;
+		
+	packet_start(SSH2_MSG_USERAUTH_REQUEST);
+	packet_put_cstring(authctxt->server_user);
+	packet_put_cstring(authctxt->service);
+        packet_put_cstring(authctxt->method->name);
+
+	/* FIXME: This assumes that our current GSSAPI implementation
+	 * supports all of the mechanisms listed in supported_mechs.
+	 * This may not be the case - we should use something along
+	 * the lines of the code in gss_genr to remove the ones that
+	 * aren't supported */
+	packet_put_int(GSS_LAST_ENTRY);
+	for (i=0;i<GSS_LAST_ENTRY;i++) {
+		packet_put_string(supported_mechs[i].oid.elements,
+			  	  supported_mechs[i].oid.length);
+	}
+        packet_send();
+        packet_write_wait();
+
+        dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE,&input_gssapi_response);
+        dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN,&input_gssapi_token);
+	
+        return 1;
+}
+
+void
+input_gssapi_response(int type, u_int32_t plen, void *ctxt) 
+{
+	Authctxt *authctxt = ctxt;
+	Gssctxt *gssctxt;
+	OM_uint32 status,ms;
+	int oidlen;
+	char *oidv;
+	gss_buffer_desc send_tok;
+	
+	if (authctxt == NULL)
+		fatal("input_gssapi_response: no authentication context");
+	gssctxt = authctxt->methoddata;
+	
+	/* Setup our OID */
+	oidv=packet_get_string(&oidlen);
+	ssh_gssapi_set_oid_data(gssctxt,oidv,oidlen);
+	
+	packet_check_eom();
+	
+	status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
+				     GSS_C_NO_BUFFER, &send_tok, 
+				     NULL);
+	if (GSS_ERROR(status)) {
+		/* Start again with next method on list */
+		debug("Trying to start again");
+		userauth(authctxt,NULL);
+		return;
+	}
+
+	/* We must have data to send */					
+	packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
+	packet_put_string(send_tok.value,send_tok.length);
+	packet_send();
+	packet_write_wait();
+	gss_release_buffer(&ms, &send_tok);
+}
+
+void
+input_gssapi_token(int type, u_int32_t plen, void *ctxt)
+{
+	Authctxt *authctxt = ctxt;
+	Gssctxt *gssctxt;
+	gss_buffer_desc send_tok,recv_tok;
+	OM_uint32 status;
+	
+	if (authctxt == NULL)
+		fatal("input_gssapi_response: no authentication context");
+	gssctxt = authctxt->methoddata;
+	
+	recv_tok.value=packet_get_string(&recv_tok.length);
+
+	status=ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
+				   &recv_tok, &send_tok, NULL);
+
+	packet_check_eom();
+	
+	if (GSS_ERROR(status)) {
+		/* Start again with the next method in the list */
+		userauth(authctxt,NULL);
+		return;
+	}
+	
+	if (send_tok.length>0) {
+		packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
+		packet_put_string(send_tok.value,send_tok.length);
+		packet_send();
+		packet_write_wait();
+	}
+	
+	if (status == GSS_S_COMPLETE) {
+		/* If that succeeded, send a exchange complete message */
+		packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
+		packet_send();
+		packet_write_wait();
+	}
+}
+
+int
+userauth_external(Authctxt *authctxt)
+{
+        static int attempt =0;
+        
+        if (attempt++ >= 1)
+        	return 0;
+                                
+        debug2("userauth_external");
+        packet_start(SSH2_MSG_USERAUTH_REQUEST);
+        packet_put_cstring(authctxt->server_user);
+        packet_put_cstring(authctxt->service);
+        packet_put_cstring(authctxt->method->name);
+        packet_send();
+        packet_write_wait();
+        return 1;
+}                                                                                                
+#endif /* GSSAPI */
 
 int
 userauth_none(Authctxt *authctxt)
diff -u -N --exclude configure --exclude config.h.in src.old/sshd.c src/sshd.c
--- src.old/sshd.c	Sat Jan 11 17:08:26 2003
+++ src/sshd.c	Sat Jan 11 17:08:20 2003
@@ -85,6 +85,10 @@
 #include "monitor_wrap.h"
 #include "monitor_fdpass.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 #ifdef LIBWRAP
 #include <tcpd.h>
 #include <syslog.h>
@@ -1005,10 +1009,13 @@
 		log("Disabling protocol version 1. Could not load host key");
 		options.protocol &= ~SSH_PROTO_1;
 	}
+#ifndef GSSAPI
+	/* The GSSAPI key exchange can run without a host key */
 	if ((options.protocol & SSH_PROTO_2) && !sensitive_data.have_ssh2_key) {
 		log("Disabling protocol version 2. Could not load host key");
 		options.protocol &= ~SSH_PROTO_2;
 	}
+#endif
 	if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) {
 		log("sshd: no hostkeys available -- exiting.");
 		exit(1);
@@ -1803,6 +1810,45 @@
 		myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
 	}
 	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types();
+
+#ifdef GSSAPI
+	{ 
+	char *orig;
+	char *gss = NULL;
+	char *newstr = NULL;
+       	orig = myproposal[PROPOSAL_KEX_ALGS];
+
+	/* If we don't have a host key, then all of the algorithms
+	 * currently in myproposal are useless */
+	if (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])==0)
+		orig= NULL;
+		
+        if (options.gss_keyex)
+        	gss = ssh_gssapi_mechanisms(1,NULL);
+        else
+        	gss = NULL;
+        
+	if (gss && orig) {
+		int len = strlen(orig) + strlen(gss) +2;
+		newstr=xmalloc(len);
+		snprintf(newstr,len,"%s,%s",gss,orig);
+	} else if (gss) {
+		newstr=gss;
+	} else if (orig) {
+		newstr=orig;
+	}
+        /* If we've got GSSAPI mechanisms, then we've also got the 'null'
+	   host key algorithm, but we're not allowed to advertise it, unless
+	   its the only host key algorithm we're supporting */
+	if (gss && (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])) == 0) {
+	  	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]="null";
+	}
+	if (newstr)
+		myproposal[PROPOSAL_KEX_ALGS]=newstr;
+	else
+		fatal("No supported key exchange algorithms");
+	}
+#endif
 
 	/* start key exchange */
 	kex = kex_setup(myproposal);
diff -u -N --exclude configure --exclude config.h.in src.old/sshd_config.5 src/sshd_config.5
--- src.old/sshd_config.5	Sat Jan 11 17:08:26 2003
+++ src/sshd_config.5	Sat Jan 11 17:08:20 2003
@@ -253,6 +253,25 @@
 or
 .Dq rsa
 are used for version 2 of the SSH protocol.
+.It Cm GssapiAuthentication
+Specifies whether authentication based on GSSAPI may be used, either using
+the result of a successful key exchange, or using GSSAPI user
+authentication.
+The default is 
+.Dq yes .
+Note that this option applies to protocol version 2 only.
+.It Cm GssapiKeyExchange
+Specifies whether key exchange based on GSSAPI may be used. When using
+GSSAPI key exchange the server need not have a host key.
+The default is
+.Dq yes .
+Note that this option applies to protocol version 2 only.
+.It Cm GssapiUseSessionCredCache
+Specifies whether a unique credentials cache name should be generated per
+session for storing delegated credentials.
+The default is
+.Dq yes .
+Note that this option applies to protocol version 2 only.
 .It Cm IgnoreRhosts
 Specifies that
 .Pa .rhosts