import openssh-5.2p1-gsskex-all-20090726.patch

1 files changed, 108 insertions, 8 deletions

diff --git a/gss-genr.c b/gss-genr.c
index 822a08212..c51fa727d 100644
--- a/gss-genr.c
+++ b/gss-genr.c
@@ -1,7 +1,7 @@
 /* $OpenBSD: gss-genr.c,v 1.19 2007/06/12 11:56:15 dtucker Exp $ */
 
 /*
- * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -76,19 +76,20 @@ ssh_gssapi_oid_table_ok() {
  */
 
 char *
-ssh_gssapi_client_mechanisms(const char *host) {
+ssh_gssapi_client_mechanisms(const char *host, const char *client) {
         gss_OID_set gss_supported;
         OM_uint32 min_status;
 
-        gss_indicate_mechs(&min_status, &gss_supported);
+        if (GSS_ERROR(gss_indicate_mechs(&min_status, &gss_supported)))
+                return NULL;
 
         return(ssh_gssapi_kex_mechs(gss_supported, ssh_gssapi_check_mechanism,
-            host));
+            host, client));
 }
 
 char *
 ssh_gssapi_kex_mechs(gss_OID_set gss_supported, ssh_gssapi_check_fn *check,
-    const char *data) {
+    const char *host, const char *client) {
         Buffer buf;
         size_t i;
         int oidpos, enclen;
@@ -112,7 +113,7 @@ ssh_gssapi_kex_mechs(gss_OID_set gss_supported, ssh_gssapi_check_fn *check,
         oidpos = 0;
         for (i = 0; i < gss_supported->count; i++) {
                 if (gss_supported->elements[i].length < 128 &&
-                    (*check)(NULL, &(gss_supported->elements[i]), data)) {
+                    (*check)(NULL, &(gss_supported->elements[i]), host, client)) {
 
                         deroid[0] = SSH_GSS_OIDTYPE;
                         deroid[1] = gss_supported->elements[i].length;
@@ -171,12 +172,18 @@ ssh_gssapi_id_kex(Gssctxt *ctx, char *name, int kex_type) {
         
         switch (kex_type) {
         case KEX_GSS_GRP1_SHA1:
+                if (strlen(name) < sizeof(KEX_GSS_GRP1_SHA1_ID))
+                        return GSS_C_NO_OID;
                 name += sizeof(KEX_GSS_GRP1_SHA1_ID) - 1;
                 break;
         case KEX_GSS_GRP14_SHA1:
+                if (strlen(name) < sizeof(KEX_GSS_GRP14_SHA1_ID))
+                        return GSS_C_NO_OID;
                 name += sizeof(KEX_GSS_GRP14_SHA1_ID) - 1;
                 break;
         case KEX_GSS_GEX_SHA1:
+                if (strlen(name) < sizeof(KEX_GSS_GEX_SHA1_ID))
+                        return GSS_C_NO_OID;
                 name += sizeof(KEX_GSS_GEX_SHA1_ID) - 1;
                 break;
         default:
@@ -345,7 +352,7 @@ ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok,
         }
 
         ctx->major = gss_init_sec_context(&ctx->minor,
-            GSS_C_NO_CREDENTIAL, &ctx->context, ctx->name, ctx->oid,
+            ctx->client_creds, &ctx->context, ctx->name, ctx->oid,
             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | deleg_flag,
             0, NULL, recv_tok, NULL, send_tok, flags, NULL);
 
@@ -375,6 +382,37 @@ ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
 }
 
 OM_uint32
+ssh_gssapi_client_identity(Gssctxt *ctx, const char *name)
+{
+        gss_buffer_desc gssbuf;
+        gss_name_t gssname;
+        OM_uint32 status;
+        gss_OID_set oidset;
+
+        gssbuf.value = (void *) name;
+        gssbuf.length = strlen(gssbuf.value);
+
+        gss_create_empty_oid_set(&status, &oidset);
+        gss_add_oid_set_member(&status, ctx->oid, &oidset);
+
+        ctx->major = gss_import_name(&ctx->minor, &gssbuf,
+            GSS_C_NT_USER_NAME, &gssname);
+
+        if (!ctx->major)
+                ctx->major = gss_acquire_cred(&ctx->minor, 
+                    gssname, 0, oidset, GSS_C_INITIATE, 
+                    &ctx->client_creds, NULL, NULL);
+
+        gss_release_name(&status, &gssname);
+        gss_release_oid_set(&status, &oidset);
+
+        if (ctx->major)
+                ssh_gssapi_error(ctx);
+
+        return(ctx->major);
+}
+
+OM_uint32
 ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
 {
         if (ctx == NULL) 
@@ -413,7 +451,8 @@ ssh_gssapi_buildmic(Buffer *b, const char *user, const char *service,
 }
 
 int
-ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
+ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host, 
+    const char *client)
 {
         gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
         OM_uint32 major, minor;
@@ -431,6 +470,10 @@ ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
         ssh_gssapi_build_ctx(ctx);
         ssh_gssapi_set_oid(*ctx, oid);
         major = ssh_gssapi_import_name(*ctx, host);
+
+        if (!GSS_ERROR(major) && client)
+                major = ssh_gssapi_client_identity(*ctx, client);
+
         if (!GSS_ERROR(major)) {
                 major = ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token, 
                     NULL);
@@ -446,4 +489,61 @@ ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
         return (!GSS_ERROR(major));
 }
 
+int
+ssh_gssapi_credentials_updated(Gssctxt *ctxt) {
+        static gss_name_t saved_name = GSS_C_NO_NAME;
+        static OM_uint32 saved_lifetime = 0;
+        static gss_OID saved_mech = GSS_C_NO_OID;
+        static gss_name_t name;
+        static OM_uint32 last_call = 0;
+        OM_uint32 lifetime, now, major, minor;
+        int equal;
+        gss_cred_usage_t usage = GSS_C_INITIATE;
+        
+        now = time(NULL);
+
+        if (ctxt) {
+                debug("Rekey has happened - updating saved versions");
+
+                if (saved_name != GSS_C_NO_NAME)
+                        gss_release_name(&minor, &saved_name);
+
+                major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL,
+                    &saved_name, &saved_lifetime, NULL, NULL);
+
+                if (!GSS_ERROR(major)) {
+                        saved_mech = ctxt->oid;
+                        saved_lifetime+= now;
+                } else {
+                        /* Handle the error */
+                }
+                return 0;
+        }
+
+        if (now - last_call < 10)
+                return 0;
+
+        last_call = now;
+
+        if (saved_mech == GSS_C_NO_OID)
+                return 0;
+        
+        major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL, 
+            &name, &lifetime, NULL, NULL);
+        if (major == GSS_S_CREDENTIALS_EXPIRED)
+                return 0;
+        else if (GSS_ERROR(major))
+                return 0;
+
+        major = gss_compare_name(&minor, saved_name, name, &equal);
+        gss_release_name(&minor, &name);
+        if (GSS_ERROR(major))
+                return 0;
+
+        if (equal && (saved_lifetime < lifetime + now - 10))
+                return 1;
+
+        return 0;
+}
+
 #endif /* GSSAPI */