krb5: fix CVE-2015-2696

lib/gssapi/krb5/iakerb.c in MIT Kerberos 5 (aka krb5) before 1.14
relies on an inappropriate context handle, which allows remote
attackers to cause a denial of service (incorrect pointer read and
process crash) via a crafted IAKERB packet that is mishandled during
a gss_inquire_context call.

Backport upstream commit to fix it:
https://github.com/krb5/krb5/commit/e04f0283516e80d2f93366e0d479d13c9b5c8c2a

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

2 files changed, 740 insertions, 0 deletions

diff --git a/meta-oe/recipes-connectivity/krb5/krb5/Fix-IAKERB-context-aliasing-bugs-CVE-2015-2696.patch b/meta-oe/recipes-connectivity/krb5/krb5/Fix-IAKERB-context-aliasing-bugs-CVE-2015-2696.patch
new file mode 100644
index 0000000000..b771b41466
--- /dev/null
+++ b/meta-oe/recipes-connectivity/krb5/krb5/Fix-IAKERB-context-aliasing-bugs-CVE-2015-2696.patch
@@ -0,0 +1,739 @@
+From f6e57c402688f4bc386d1a39512657a30f0bafd3 Mon Sep 17 00:00:00 2001
+From: Nicolas Williams <nico@twosigma.com>
+Date: Mon, 14 Sep 2015 12:28:36 -0400
+Subject: [PATCH 2/4] 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
+
+Backport upstream commit:
+https://github.com/krb5/krb5/commit/e04f0283516e80d2f93366e0d479d13c9b5c8c2a
+
+Upstream-Status: Backport
+---
+ 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 a0e8625..05dc321 100644
+--- a/src/lib/gssapi/krb5/gssapiP_krb5.h
++++ b/src/lib/gssapi/krb5/gssapiP_krb5.h
+@@ -620,6 +620,21 @@ 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 */
+@@ -1301,6 +1316,105 @@ 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 77b7fff..9a23656 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);
++}
+-- 
+1.9.1
+
diff --git a/meta-oe/recipes-connectivity/krb5/krb5_1.13.2.bb b/meta-oe/recipes-connectivity/krb5/krb5_1.13.2.bb
index 1b02f1a04a..6c25d825dd 100644
--- a/meta-oe/recipes-connectivity/krb5/krb5_1.13.2.bb
+++ b/meta-oe/recipes-connectivity/krb5/krb5_1.13.2.bb
@@ -24,6 +24,7 @@ SRC_URI = "http://web.mit.edu/kerberos/dist/${BPN}/${SHRT_VER}/${BP}-signed.tar
            file://0001-aclocal-Add-parameter-to-disable-keyutils-detection.patch \
            file://debian-suppress-usr-lib-in-krb5-config.patch;striplevel=2 \
            file://Fix-SPNEGO-context-aliasing-bugs-CVE-2015-2695.patch;striplevel=2 \
+           file://Fix-IAKERB-context-aliasing-bugs-CVE-2015-2696.patch;striplevel=2 \
            file://crosscompile_nm.patch \
            file://etc/init.d/krb5-kdc \
            file://etc/init.d/krb5-admin-server \