1 files changed, 107 insertions, 1 deletions

diff --git a/monitor.c b/monitor.c
index 531c4f9a8..291881493 100644
--- a/monitor.c
+++ b/monitor.c
@@ -175,6 +175,8 @@ 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_checkmic(int, Buffer *);
+int mm_answer_gss_sign(int, Buffer *);
+int mm_answer_gss_updatecreds(int, Buffer *);
 #endif
 
 #ifdef SSH_AUDIT_EVENTS
@@ -247,11 +249,18 @@ struct mon_table mon_dispatch_proto20[] = {
     {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
     {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
     {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
+    {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
 #endif
     {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},
+    {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
+#endif
     {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
     {MONITOR_REQ_SIGN, 0, mm_answer_sign},
     {MONITOR_REQ_PTY, 0, mm_answer_pty},
@@ -360,6 +369,10 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
                 /* 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);
+#endif
         } else {
                 mon_dispatch = mon_dispatch_proto15;
 
@@ -465,6 +478,10 @@ monitor_child_postauth(struct monitor *pmonitor)
                 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
                 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
                 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
+#ifdef GSSAPI
+                /* and for the GSSAPI key exchange */
+                monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
+#endif          
         } else {
                 mon_dispatch = mon_dispatch_postauth15;
                 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
@@ -1834,6 +1851,13 @@ mm_get_kex(Buffer *m)
         kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
         kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
         kex->kex[KEX_C25519_SHA256] = kexc25519_server;
+#ifdef GSSAPI
+        if (options.gss_keyex) {
+                kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
+                kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
+                kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
+        }
+#endif
         kex->server = 1;
         kex->hostkey_type = buffer_get_int(m);
         kex->kex_type = buffer_get_int(m);
@@ -2041,6 +2065,9 @@ mm_answer_gss_setup_ctx(int sock, Buffer *m)
         OM_uint32 major;
         u_int len;
 
+        if (!options.gss_authentication && !options.gss_keyex)
+                fatal("In GSSAPI monitor when GSSAPI is disabled");
+
         goid.elements = buffer_get_string(m, &len);
         goid.length = len;
 
@@ -2068,6 +2095,9 @@ mm_answer_gss_accept_ctx(int sock, Buffer *m)
         OM_uint32 flags = 0; /* GSI needs this */
         u_int len;
 
+        if (!options.gss_authentication && !options.gss_keyex)
+                fatal("In GSSAPI monitor when GSSAPI is disabled");
+
         in.value = buffer_get_string(m, &len);
         in.length = len;
         major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
@@ -2085,6 +2115,7 @@ mm_answer_gss_accept_ctx(int sock, Buffer *m)
                 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
                 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
                 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
+                monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
         }
         return (0);
 }
@@ -2096,6 +2127,9 @@ mm_answer_gss_checkmic(int sock, Buffer *m)
         OM_uint32 ret;
         u_int len;
 
+        if (!options.gss_authentication && !options.gss_keyex)
+                fatal("In GSSAPI monitor when GSSAPI is disabled");
+
         gssbuf.value = buffer_get_string(m, &len);
         gssbuf.length = len;
         mic.value = buffer_get_string(m, &len);
@@ -2122,7 +2156,11 @@ mm_answer_gss_userok(int sock, Buffer *m)
 {
         int authenticated;
 
-        authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
+        if (!options.gss_authentication && !options.gss_keyex)
+                fatal("In GSSAPI monitor when GSSAPI is disabled");
+
+        authenticated = authctxt->valid && 
+            ssh_gssapi_userok(authctxt->user, authctxt->pw);
 
         buffer_clear(m);
         buffer_put_int(m, authenticated);
@@ -2135,5 +2173,73 @@ mm_answer_gss_userok(int sock, Buffer *m)
         /* Monitor loop will terminate if authenticated */
         return (authenticated);
 }
+
+int 
+mm_answer_gss_sign(int socket, Buffer *m)
+{
+        gss_buffer_desc data;
+        gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
+        OM_uint32 major, minor;
+        u_int len;
+
+        if (!options.gss_authentication && !options.gss_keyex)
+                fatal("In GSSAPI monitor when GSSAPI is disabled");
+
+        data.value = buffer_get_string(m, &len);
+        data.length = len;
+        if (data.length != 20) 
+                fatal("%s: data length incorrect: %d", __func__, 
+                    (int) data.length);
+
+        /* Save the session ID on the first time around */
+        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);
+
+        free(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 getpwnam permissions */
+        monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
+        
+        /* And credential updating, for when rekeying */
+        monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1);
+
+        return (0);
+}
+
+int
+mm_answer_gss_updatecreds(int socket, Buffer *m) {
+        ssh_gssapi_ccache store;
+        int ok;
+
+        store.filename = buffer_get_string(m, NULL);
+        store.envvar   = buffer_get_string(m, NULL);
+        store.envval   = buffer_get_string(m, NULL);
+
+        ok = ssh_gssapi_update_creds(&store);
+
+        free(store.filename);
+        free(store.envvar);
+        free(store.envval);
+
+        buffer_clear(m);
+        buffer_put_int(m, ok);
+
+        mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m);
+
+        return(0);
+}
+
 #endif /* GSSAPI */