Package: krb5 / 1.12.1+dfsg-19+deb8u4

upstream/0032-Fix-IAKERB-context-aliasing-bugs-CVE-2015-2696.patch Patch series | download
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From 515ddf7c62b5944e550728ee8bab284b852f8995 Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@twosigma.com>
Date: Mon, 14 Sep 2015 12:28:36 -0400
Subject: Fix IAKERB context aliasing bugs [CVE-2015-2696]

The IAKERB mechanism currently replaces its context handle with the
krb5 mechanism handle upon establishment, under the assumption that
most GSS functions are only called after context establishment.  This
assumption is incorrect, and can lead to aliasing violations for some
programs.  Maintain the IAKERB context structure after context
establishment and add new IAKERB entry points to refer to it with that
type.  Add initiate and established flags to the IAKERB context
structure for use in gss_inquire_context() prior to context
establishment.

CVE-2015-2696:

In MIT krb5 1.9 and later, applications which call
gss_inquire_context() on a partially-established IAKERB context can
cause the GSS-API library to read from a pointer using the wrong type,
generally causing a process crash.  Java server applications using the
native JGSS provider are vulnerable to this bug.  A carefully crafted
IAKERB packet might allow the gss_inquire_context() call to succeed
with attacker-determined results, but applications should not make
access control decisions based on gss_inquire_context() results prior
to context establishment.

    CVSSv2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C/E:POC/RL:OF/RC:C

[ghudson@mit.edu: several bugfixes, style changes, and edge-case
behavior changes; commit message and CVE description]

ticket: 8244
target_version: 1.14
tags: pullup

(cherry picked from commit e04f0283516e80d2f93366e0d479d13c9b5c8c2a)
(cherry picked from commit ebea85358bc72ec20c53130d83acb93f95853b76)

Patch-Category: upstream
---
 src/lib/gssapi/krb5/gssapiP_krb5.h | 114 ++++++++++++
 src/lib/gssapi/krb5/gssapi_krb5.c  | 105 +++++++++--
 src/lib/gssapi/krb5/iakerb.c       | 351 +++++++++++++++++++++++++++++++++----
 3 files changed, 529 insertions(+), 41 deletions(-)

diff --git a/src/lib/gssapi/krb5/gssapiP_krb5.h b/src/lib/gssapi/krb5/gssapiP_krb5.h
index 42d16ad..b14788d 100644
--- a/src/lib/gssapi/krb5/gssapiP_krb5.h
+++ b/src/lib/gssapi/krb5/gssapiP_krb5.h
@@ -618,6 +618,21 @@ OM_uint32 KRB5_CALLCONV krb5_gss_accept_sec_context_ext
 );
 #endif /* LEAN_CLIENT */
 
+OM_uint32 KRB5_CALLCONV krb5_gss_inquire_sec_context_by_oid
+(OM_uint32*,       /* minor_status */
+ const gss_ctx_id_t,
+ /* context_handle */
+ const gss_OID,    /* desired_object */
+ gss_buffer_set_t* /* data_set */
+);
+
+OM_uint32 KRB5_CALLCONV krb5_gss_set_sec_context_option
+(OM_uint32*,       /* minor_status */
+ gss_ctx_id_t*,    /* context_handle */
+ const gss_OID,    /* desired_object */
+ const gss_buffer_t/* value */
+);
+
 OM_uint32 KRB5_CALLCONV krb5_gss_process_context_token
 (OM_uint32*,       /* minor_status */
  gss_ctx_id_t,     /* context_handle */
@@ -1298,6 +1313,105 @@ OM_uint32 KRB5_CALLCONV
 krb5_gss_import_cred(OM_uint32 *minor_status, gss_buffer_t token,
                      gss_cred_id_t *cred_handle);
 
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_process_context_token(OM_uint32 *minor_status,
+                                 const gss_ctx_id_t context_handle,
+                                 const gss_buffer_t token_buffer);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_context_time(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                        OM_uint32 *time_rec);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_inquire_context(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, gss_name_t *src_name,
+                           gss_name_t *targ_name, OM_uint32 *lifetime_rec,
+                           gss_OID *mech_type, OM_uint32 *ctx_flags,
+                           int *locally_initiated, int *opened);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                   gss_qop_t qop_req, gss_buffer_t message_buffer,
+                   gss_buffer_t message_token);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                       gss_qop_t qop_req, gss_iov_buffer_desc *iov,
+                       int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic_iov_length(OM_uint32 *minor_status,
+                              gss_ctx_id_t context_handle, gss_qop_t qop_req,
+                              gss_iov_buffer_desc *iov, int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_verify_mic(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                      gss_buffer_t msg_buffer, gss_buffer_t token_buffer,
+                      gss_qop_t *qop_state);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_verify_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                          gss_qop_t *qop_state, gss_iov_buffer_desc *iov,
+                          int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                int conf_req_flag, gss_qop_t qop_req,
+                gss_buffer_t input_message_buffer, int *conf_state,
+                gss_buffer_t output_message_buffer);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                    int conf_req_flag, gss_qop_t qop_req, int *conf_state,
+                    gss_iov_buffer_desc *iov, int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_iov_length(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, int conf_req_flag,
+                           gss_qop_t qop_req, int *conf_state,
+                           gss_iov_buffer_desc *iov, int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_unwrap(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                  gss_buffer_t input_message_buffer,
+                  gss_buffer_t output_message_buffer, int *conf_state,
+                  gss_qop_t *qop_state);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_unwrap_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                      int *conf_state, gss_qop_t *qop_state,
+                      gss_iov_buffer_desc *iov, int iov_count);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_size_limit(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, int conf_req_flag,
+                           gss_qop_t qop_req, OM_uint32 req_output_size,
+                           OM_uint32 *max_input_size);
+
+#ifndef LEAN_CLIENT
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_export_sec_context(OM_uint32 *minor_status,
+                              gss_ctx_id_t *context_handle,
+                              gss_buffer_t interprocess_token);
+#endif /* LEAN_CLIENT */
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_inquire_sec_context_by_oid(OM_uint32 *minor_status,
+                                      const gss_ctx_id_t context_handle,
+                                      const gss_OID desired_object,
+                                      gss_buffer_set_t *data_set);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_set_sec_context_option(OM_uint32 *minor_status,
+                                  gss_ctx_id_t *context_handle,
+                                  const gss_OID desired_object,
+                                  const gss_buffer_t value);
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_pseudo_random(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                         int prf_key, const gss_buffer_t prf_in,
+                         ssize_t desired_output_len, gss_buffer_t prf_out);
+
 /* Magic string to identify exported krb5 GSS credentials.  Increment this if
  * the format changes. */
 #define CRED_EXPORT_MAGIC "K5C1"
diff --git a/src/lib/gssapi/krb5/gssapi_krb5.c b/src/lib/gssapi/krb5/gssapi_krb5.c
index 088219a..61a6922 100644
--- a/src/lib/gssapi/krb5/gssapi_krb5.c
+++ b/src/lib/gssapi/krb5/gssapi_krb5.c
@@ -345,7 +345,7 @@ static struct {
     }
 };
 
-static OM_uint32 KRB5_CALLCONV
+OM_uint32 KRB5_CALLCONV
 krb5_gss_inquire_sec_context_by_oid (OM_uint32 *minor_status,
                                      const gss_ctx_id_t context_handle,
                                      const gss_OID desired_object,
@@ -459,7 +459,7 @@ static struct {
 };
 #endif
 
-static OM_uint32 KRB5_CALLCONV
+OM_uint32 KRB5_CALLCONV
 krb5_gss_set_sec_context_option (OM_uint32 *minor_status,
                                  gss_ctx_id_t *context_handle,
                                  const gss_OID desired_object,
@@ -904,20 +904,103 @@ static struct gss_config krb5_mechanism = {
     krb5_gss_get_mic_iov_length,
 };
 
+/* Functions which use security contexts or acquire creds are IAKERB-specific;
+ * other functions can borrow from the krb5 mech. */
+static struct gss_config iakerb_mechanism = {
+    { GSS_MECH_KRB5_OID_LENGTH, GSS_MECH_KRB5_OID },
+    NULL,
+    iakerb_gss_acquire_cred,
+    krb5_gss_release_cred,
+    iakerb_gss_init_sec_context,
+#ifdef LEAN_CLIENT
+    NULL,
+#else
+    iakerb_gss_accept_sec_context,
+#endif
+    iakerb_gss_process_context_token,
+    iakerb_gss_delete_sec_context,
+    iakerb_gss_context_time,
+    iakerb_gss_get_mic,
+    iakerb_gss_verify_mic,
+#if defined(IOV_SHIM_EXERCISE_WRAP) || defined(IOV_SHIM_EXERCISE)
+    NULL,
+#else
+    iakerb_gss_wrap,
+#endif
+#if defined(IOV_SHIM_EXERCISE_UNWRAP) || defined(IOV_SHIM_EXERCISE)
+    NULL,
+#else
+    iakerb_gss_unwrap,
+#endif
+    krb5_gss_display_status,
+    krb5_gss_indicate_mechs,
+    krb5_gss_compare_name,
+    krb5_gss_display_name,
+    krb5_gss_import_name,
+    krb5_gss_release_name,
+    krb5_gss_inquire_cred,
+    NULL,                /* add_cred */
+#ifdef LEAN_CLIENT
+    NULL,
+    NULL,
+#else
+    iakerb_gss_export_sec_context,
+    NULL,
+#endif
+    krb5_gss_inquire_cred_by_mech,
+    krb5_gss_inquire_names_for_mech,
+    iakerb_gss_inquire_context,
+    krb5_gss_internal_release_oid,
+    iakerb_gss_wrap_size_limit,
+    krb5_gss_localname,
+    krb5_gss_authorize_localname,
+    krb5_gss_export_name,
+    krb5_gss_duplicate_name,
+    krb5_gss_store_cred,
+    iakerb_gss_inquire_sec_context_by_oid,
+    krb5_gss_inquire_cred_by_oid,
+    iakerb_gss_set_sec_context_option,
+    krb5_gssspi_set_cred_option,
+    krb5_gssspi_mech_invoke,
+    NULL,                /* wrap_aead */
+    NULL,                /* unwrap_aead */
+    iakerb_gss_wrap_iov,
+    iakerb_gss_unwrap_iov,
+    iakerb_gss_wrap_iov_length,
+    NULL,               /* complete_auth_token */
+    NULL,               /* acquire_cred_impersonate_name */
+    NULL,               /* add_cred_impersonate_name */
+    NULL,               /* display_name_ext */
+    krb5_gss_inquire_name,
+    krb5_gss_get_name_attribute,
+    krb5_gss_set_name_attribute,
+    krb5_gss_delete_name_attribute,
+    krb5_gss_export_name_composite,
+    krb5_gss_map_name_to_any,
+    krb5_gss_release_any_name_mapping,
+    iakerb_gss_pseudo_random,
+    NULL,               /* set_neg_mechs */
+    krb5_gss_inquire_saslname_for_mech,
+    krb5_gss_inquire_mech_for_saslname,
+    krb5_gss_inquire_attrs_for_mech,
+    krb5_gss_acquire_cred_from,
+    krb5_gss_store_cred_into,
+    iakerb_gss_acquire_cred_with_password,
+    krb5_gss_export_cred,
+    krb5_gss_import_cred,
+    NULL,               /* import_sec_context_by_mech */
+    NULL,               /* import_name_by_mech */
+    NULL,               /* import_cred_by_mech */
+    iakerb_gss_get_mic_iov,
+    iakerb_gss_verify_mic_iov,
+    iakerb_gss_get_mic_iov_length,
+};
+
 #ifdef _GSS_STATIC_LINK
 #include "mglueP.h"
 static int gss_iakerbmechglue_init(void)
 {
     struct gss_mech_config mech_iakerb;
-    struct gss_config iakerb_mechanism = krb5_mechanism;
-
-    /* IAKERB mechanism mirrors krb5, but with different context SPIs */
-    iakerb_mechanism.gss_accept_sec_context = iakerb_gss_accept_sec_context;
-    iakerb_mechanism.gss_init_sec_context   = iakerb_gss_init_sec_context;
-    iakerb_mechanism.gss_delete_sec_context = iakerb_gss_delete_sec_context;
-    iakerb_mechanism.gss_acquire_cred       = iakerb_gss_acquire_cred;
-    iakerb_mechanism.gssspi_acquire_cred_with_password
-                                    = iakerb_gss_acquire_cred_with_password;
 
     memset(&mech_iakerb, 0, sizeof(mech_iakerb));
     mech_iakerb.mech = &iakerb_mechanism;
diff --git a/src/lib/gssapi/krb5/iakerb.c b/src/lib/gssapi/krb5/iakerb.c
index f30de32..4662bd9 100644
--- a/src/lib/gssapi/krb5/iakerb.c
+++ b/src/lib/gssapi/krb5/iakerb.c
@@ -47,6 +47,8 @@ struct _iakerb_ctx_id_rec {
     gss_ctx_id_t gssc;
     krb5_data conv;                     /* conversation for checksumming */
     unsigned int count;                 /* number of round trips */
+    int initiate;
+    int established;
     krb5_get_init_creds_opt *gic_opts;
 };
 
@@ -695,7 +697,7 @@ cleanup:
  * Allocate and initialise an IAKERB context
  */
 static krb5_error_code
-iakerb_alloc_context(iakerb_ctx_id_t *pctx)
+iakerb_alloc_context(iakerb_ctx_id_t *pctx, int initiate)
 {
     iakerb_ctx_id_t ctx;
     krb5_error_code code;
@@ -709,6 +711,8 @@ iakerb_alloc_context(iakerb_ctx_id_t *pctx)
     ctx->magic = KG_IAKERB_CONTEXT;
     ctx->state = IAKERB_AS_REQ;
     ctx->count = 0;
+    ctx->initiate = initiate;
+    ctx->established = 0;
 
     code = krb5_gss_init_context(&ctx->k5c);
     if (code != 0)
@@ -732,7 +736,7 @@ iakerb_gss_delete_sec_context(OM_uint32 *minor_status,
                               gss_ctx_id_t *context_handle,
                               gss_buffer_t output_token)
 {
-    OM_uint32 major_status = GSS_S_COMPLETE;
+    iakerb_ctx_id_t iakerb_ctx = (iakerb_ctx_id_t)*context_handle;
 
     if (output_token != GSS_C_NO_BUFFER) {
         output_token->length = 0;
@@ -740,23 +744,10 @@ iakerb_gss_delete_sec_context(OM_uint32 *minor_status,
     }
 
     *minor_status = 0;
+    *context_handle = GSS_C_NO_CONTEXT;
+    iakerb_release_context(iakerb_ctx);
 
-    if (*context_handle != GSS_C_NO_CONTEXT) {
-        iakerb_ctx_id_t iakerb_ctx = (iakerb_ctx_id_t)*context_handle;
-
-        if (iakerb_ctx->magic == KG_IAKERB_CONTEXT) {
-            iakerb_release_context(iakerb_ctx);
-            *context_handle = GSS_C_NO_CONTEXT;
-        } else {
-            assert(iakerb_ctx->magic == KG_CONTEXT);
-
-            major_status = krb5_gss_delete_sec_context(minor_status,
-                                                       context_handle,
-                                                       output_token);
-        }
-    }
-
-    return major_status;
+    return GSS_S_COMPLETE;
 }
 
 static krb5_boolean
@@ -802,7 +793,7 @@ iakerb_gss_accept_sec_context(OM_uint32 *minor_status,
     int initialContextToken = (*context_handle == GSS_C_NO_CONTEXT);
 
     if (initialContextToken) {
-        code = iakerb_alloc_context(&ctx);
+        code = iakerb_alloc_context(&ctx, 0);
         if (code != 0)
             goto cleanup;
 
@@ -854,11 +845,8 @@ iakerb_gss_accept_sec_context(OM_uint32 *minor_status,
                                                        time_rec,
                                                        delegated_cred_handle,
                                                        &exts);
-        if (major_status == GSS_S_COMPLETE) {
-            *context_handle = ctx->gssc;
-            ctx->gssc = NULL;
-            iakerb_release_context(ctx);
-        }
+        if (major_status == GSS_S_COMPLETE)
+            ctx->established = 1;
         if (mech_type != NULL)
             *mech_type = (gss_OID)gss_mech_krb5;
     }
@@ -897,7 +885,7 @@ iakerb_gss_init_sec_context(OM_uint32 *minor_status,
     int initialContextToken = (*context_handle == GSS_C_NO_CONTEXT);
 
     if (initialContextToken) {
-        code = iakerb_alloc_context(&ctx);
+        code = iakerb_alloc_context(&ctx, 1);
         if (code != 0) {
             *minor_status = code;
             goto cleanup;
@@ -983,11 +971,8 @@ iakerb_gss_init_sec_context(OM_uint32 *minor_status,
                                                      ret_flags,
                                                      time_rec,
                                                      &exts);
-        if (major_status == GSS_S_COMPLETE) {
-            *context_handle = ctx->gssc;
-            ctx->gssc = GSS_C_NO_CONTEXT;
-            iakerb_release_context(ctx);
-        }
+        if (major_status == GSS_S_COMPLETE)
+            ctx->established = 1;
         if (actual_mech_type != NULL)
             *actual_mech_type = (gss_OID)gss_mech_krb5;
     } else {
@@ -1010,3 +995,309 @@ cleanup:
 
     return major_status;
 }
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_unwrap(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                  gss_buffer_t input_message_buffer,
+                  gss_buffer_t output_message_buffer, int *conf_state,
+                  gss_qop_t *qop_state)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_unwrap(minor_status, ctx->gssc, input_message_buffer,
+                           output_message_buffer, conf_state, qop_state);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                int conf_req_flag, gss_qop_t qop_req,
+                gss_buffer_t input_message_buffer, int *conf_state,
+                gss_buffer_t output_message_buffer)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_wrap(minor_status, ctx->gssc, conf_req_flag, qop_req,
+                         input_message_buffer, conf_state,
+                         output_message_buffer);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_process_context_token(OM_uint32 *minor_status,
+                                 const gss_ctx_id_t context_handle,
+                                 const gss_buffer_t token_buffer)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_DEFECTIVE_TOKEN;
+
+    return krb5_gss_process_context_token(minor_status, ctx->gssc,
+                                          token_buffer);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_context_time(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                        OM_uint32 *time_rec)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_context_time(minor_status, ctx->gssc, time_rec);
+}
+
+#ifndef LEAN_CLIENT
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_export_sec_context(OM_uint32 *minor_status,
+                              gss_ctx_id_t *context_handle,
+                              gss_buffer_t interprocess_token)
+{
+    OM_uint32 maj;
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    /* We don't currently support exporting partially established contexts. */
+    if (!ctx->established)
+        return GSS_S_UNAVAILABLE;
+
+    maj = krb5_gss_export_sec_context(minor_status, &ctx->gssc,
+                                      interprocess_token);
+    if (ctx->gssc == GSS_C_NO_CONTEXT) {
+        iakerb_release_context(ctx);
+        *context_handle = GSS_C_NO_CONTEXT;
+    }
+    return maj;
+}
+
+/*
+ * Until we implement partial context exports, there are no SPNEGO exported
+ * context tokens, only tokens for the underlying krb5 context.  So we do not
+ * need to implement an iakerb_gss_import_sec_context() yet; it would be
+ * unreachable except via a manually constructed token.
+ */
+
+#endif /* LEAN_CLIENT */
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_inquire_context(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, gss_name_t *src_name,
+                           gss_name_t *targ_name, OM_uint32 *lifetime_rec,
+                           gss_OID *mech_type, OM_uint32 *ctx_flags,
+                           int *initiate, int *opened)
+{
+    OM_uint32 ret;
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (src_name != NULL)
+        *src_name = GSS_C_NO_NAME;
+    if (targ_name != NULL)
+        *targ_name = GSS_C_NO_NAME;
+    if (lifetime_rec != NULL)
+        *lifetime_rec = 0;
+    if (mech_type != NULL)
+        *mech_type = (gss_OID)gss_mech_iakerb;
+    if (ctx_flags != NULL)
+        *ctx_flags = 0;
+    if (initiate != NULL)
+        *initiate = ctx->initiate;
+    if (opened != NULL)
+        *opened = ctx->established;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_COMPLETE;
+
+    ret = krb5_gss_inquire_context(minor_status, ctx->gssc, src_name,
+                                   targ_name, lifetime_rec, mech_type,
+                                   ctx_flags, initiate, opened);
+
+    if (!ctx->established) {
+        /* Report IAKERB as the mech OID until the context is established. */
+        if (mech_type != NULL)
+            *mech_type = (gss_OID)gss_mech_iakerb;
+
+        /* We don't support exporting partially-established contexts. */
+        if (ctx_flags != NULL)
+            *ctx_flags &= ~GSS_C_TRANS_FLAG;
+    }
+
+    return ret;
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_size_limit(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, int conf_req_flag,
+                           gss_qop_t qop_req, OM_uint32 req_output_size,
+                           OM_uint32 *max_input_size)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_wrap_size_limit(minor_status, ctx->gssc, conf_req_flag,
+                                    qop_req, req_output_size, max_input_size);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                   gss_qop_t qop_req, gss_buffer_t message_buffer,
+                   gss_buffer_t message_token)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_get_mic(minor_status, ctx->gssc, qop_req, message_buffer,
+                            message_token);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_verify_mic(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                      gss_buffer_t msg_buffer, gss_buffer_t token_buffer,
+                      gss_qop_t *qop_state)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_verify_mic(minor_status, ctx->gssc, msg_buffer,
+                               token_buffer, qop_state);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_inquire_sec_context_by_oid(OM_uint32 *minor_status,
+                                      const gss_ctx_id_t context_handle,
+                                      const gss_OID desired_object,
+                                      gss_buffer_set_t *data_set)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_UNAVAILABLE;
+
+    return krb5_gss_inquire_sec_context_by_oid(minor_status, ctx->gssc,
+                                               desired_object, data_set);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_set_sec_context_option(OM_uint32 *minor_status,
+                                  gss_ctx_id_t *context_handle,
+                                  const gss_OID desired_object,
+                                  const gss_buffer_t value)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)*context_handle;
+
+    if (ctx == NULL || ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_UNAVAILABLE;
+
+    return krb5_gss_set_sec_context_option(minor_status, &ctx->gssc,
+                                           desired_object, value);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                    int conf_req_flag, gss_qop_t qop_req, int *conf_state,
+                    gss_iov_buffer_desc *iov, int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_wrap_iov(minor_status, ctx->gssc, conf_req_flag, qop_req,
+                             conf_state, iov, iov_count);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_unwrap_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                      int *conf_state, gss_qop_t *qop_state,
+                      gss_iov_buffer_desc *iov, int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_unwrap_iov(minor_status, ctx->gssc, conf_state, qop_state,
+                               iov, iov_count);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_wrap_iov_length(OM_uint32 *minor_status,
+                           gss_ctx_id_t context_handle, int conf_req_flag,
+                           gss_qop_t qop_req, int *conf_state,
+                           gss_iov_buffer_desc *iov, int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_wrap_iov_length(minor_status, ctx->gssc, conf_req_flag,
+                                    qop_req, conf_state, iov, iov_count);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_pseudo_random(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                         int prf_key, const gss_buffer_t prf_in,
+                         ssize_t desired_output_len, gss_buffer_t prf_out)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_pseudo_random(minor_status, ctx->gssc, prf_key, prf_in,
+                                  desired_output_len, prf_out);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                       gss_qop_t qop_req, gss_iov_buffer_desc *iov,
+                       int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_get_mic_iov(minor_status, ctx->gssc, qop_req, iov,
+                                iov_count);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_verify_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
+                          gss_qop_t *qop_state, gss_iov_buffer_desc *iov,
+                          int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_verify_mic_iov(minor_status, ctx->gssc, qop_state, iov,
+                                   iov_count);
+}
+
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_get_mic_iov_length(OM_uint32 *minor_status,
+                              gss_ctx_id_t context_handle, gss_qop_t qop_req,
+                              gss_iov_buffer_desc *iov, int iov_count)
+{
+    iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+
+    if (ctx->gssc == GSS_C_NO_CONTEXT)
+        return GSS_S_NO_CONTEXT;
+
+    return krb5_gss_get_mic_iov_length(minor_status, ctx->gssc, qop_req, iov,
+                                       iov_count);
+}