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gnu: mit-krb5: Add fixes for CVE-2015-{2695,2696,2697,2698}.

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* gnu/packages/patches/mit-krb5-CVE-2015-2695-pt1.patch,
  gnu/packages/patches/mit-krb5-CVE-2015-2695-pt2.patch,
  gnu/packages/patches/mit-krb5-CVE-2015-2696.patch,
  gnu/packages/patches/mit-krb5-CVE-2015-2697.patch,
  gnu/packages/patches/mit-krb5-CVE-2015-2698-pt1.patch,
  gnu/packages/patches/mit-krb5-CVE-2015-2698-pt2.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/mit-krb5.scm (mit-krb5)[native-inputs]: Add patches.
This commit is contained in:
Mark H Weaver 2015-11-08 23:05:11 -05:00
parent 4d53c29e6c
commit ff45a00e79
8 changed files with 1619 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gnu-system.am
View File

@ -586,6 +586,12 @@ dist_patch_DATA = \
gnu/packages/patches/mcron-install.patch \
gnu/packages/patches/mdadm-gcc-4.9-fix.patch \
gnu/packages/patches/mhash-keygen-test-segfault.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2695-pt1.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2695-pt2.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2696.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2697.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2698-pt1.patch \
gnu/packages/patches/mit-krb5-CVE-2015-2698-pt2.patch \
gnu/packages/patches/mpc123-initialize-ao.patch \
gnu/packages/patches/mplayer2-theora-fix.patch \
gnu/packages/patches/module-init-tools-moduledir.patch \

14
gnu/packages/mit-krb5.scm
View File

@ -42,7 +42,19 @@
(build-system gnu-build-system)
(native-inputs
`(("bison" ,bison)
("perl" ,perl)))
("perl" ,perl)
;; Include the patches as native-inputs.
,@(map (lambda (label)
(let ((input-name (string-append "patch/" label))
(file-name (string-append name "-" label ".patch")))
`(,input-name ,(search-patch file-name))))
'("CVE-2015-2695-pt1"
"CVE-2015-2695-pt2"
"CVE-2015-2696"
"CVE-2015-2697"
"CVE-2015-2698-pt1"
"CVE-2015-2698-pt2"))))
(arguments
`(#:modules ((ice-9 ftw)
(ice-9 match)

569
gnu/packages/patches/mit-krb5-CVE-2015-2695-pt1.patch Normal file
View File

@ -0,0 +1,569 @@
Copied from Debian.
From b813d5811432faed844a2dfd3daecde914978f2c Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@twosigma.com>
Date: Mon, 14 Sep 2015 12:27:52 -0400
Subject: Fix SPNEGO context aliasing bugs [CVE-2015-2695]
The SPNEGO mechanism currently replaces its context handle with the
mechanism context 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 SPNEGO context structure after context
establishment and refer to it in all GSS methods. Add initiate and
opened flags to the SPNEGO context structure for use in
gss_inquire_context() prior to context establishment.
CVE-2015-2695:
In MIT krb5 1.5 and later, applications which call
gss_inquire_context() on a partially-established SPNEGO context can
cause the GSS-API library to read from a pointer using the wrong type,
generally causing a process crash. This bug may go unnoticed, because
the most common SPNEGO authentication scenario establishes the context
after just one call to gss_accept_sec_context(). Java server
applications using the native JGSS provider are vulnerable to this
bug. A carefully crafted SPNEGO 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 b51b33f2bc5d1497ddf5bd107f791c101695000d)
Patch-Category: upstream
---
src/lib/gssapi/spnego/gssapiP_spnego.h | 2 +
src/lib/gssapi/spnego/spnego_mech.c | 254 ++++++++++++++++++++++++---------
2 files changed, 192 insertions(+), 64 deletions(-)
diff --git a/src/lib/gssapi/spnego/gssapiP_spnego.h b/src/lib/gssapi/spnego/gssapiP_spnego.h
index bc23f56..8e05736 100644
--- a/src/lib/gssapi/spnego/gssapiP_spnego.h
+++ b/src/lib/gssapi/spnego/gssapiP_spnego.h
@@ -102,6 +102,8 @@ typedef struct {
int firstpass;
int mech_complete;
int nego_done;
+ int initiate;
+ int opened;
OM_uint32 ctx_flags;
gss_name_t internal_name;
gss_OID actual_mech;
diff --git a/src/lib/gssapi/spnego/spnego_mech.c b/src/lib/gssapi/spnego/spnego_mech.c
index 6e39c37..a1072b0 100644
--- a/src/lib/gssapi/spnego/spnego_mech.c
+++ b/src/lib/gssapi/spnego/spnego_mech.c
@@ -104,7 +104,7 @@ static OM_uint32 get_negotiable_mechs(OM_uint32 *, spnego_gss_cred_id_t,
gss_cred_usage_t, gss_OID_set *);
static void release_spnego_ctx(spnego_gss_ctx_id_t *);
static void check_spnego_options(spnego_gss_ctx_id_t);
-static spnego_gss_ctx_id_t create_spnego_ctx(void);
+static spnego_gss_ctx_id_t create_spnego_ctx(int);
static int put_mech_set(gss_OID_set mechSet, gss_buffer_t buf);
static int put_input_token(unsigned char **, gss_buffer_t, unsigned int);
static int put_mech_oid(unsigned char **, gss_OID_const, unsigned int);
@@ -442,7 +442,7 @@ check_spnego_options(spnego_gss_ctx_id_t spnego_ctx)
}
static spnego_gss_ctx_id_t
-create_spnego_ctx(void)
+create_spnego_ctx(int initiate)
{
spnego_gss_ctx_id_t spnego_ctx = NULL;
spnego_ctx = (spnego_gss_ctx_id_t)
@@ -465,6 +465,8 @@ create_spnego_ctx(void)
spnego_ctx->mic_rcvd = 0;
spnego_ctx->mech_complete = 0;
spnego_ctx->nego_done = 0;
+ spnego_ctx->opened = 0;
+ spnego_ctx->initiate = initiate;
spnego_ctx->internal_name = GSS_C_NO_NAME;
spnego_ctx->actual_mech = GSS_C_NO_OID;
@@ -630,7 +632,7 @@ init_ctx_new(OM_uint32 *minor_status,
OM_uint32 ret;
spnego_gss_ctx_id_t sc = NULL;
- sc = create_spnego_ctx();
+ sc = create_spnego_ctx(1);
if (sc == NULL)
return GSS_S_FAILURE;
@@ -647,10 +649,7 @@ init_ctx_new(OM_uint32 *minor_status,
ret = GSS_S_FAILURE;
goto cleanup;
}
- /*
- * The actual context is not yet determined, set the output
- * context handle to refer to the spnego context itself.
- */
+
sc->ctx_handle = GSS_C_NO_CONTEXT;
*ctx = (gss_ctx_id_t)sc;
sc = NULL;
@@ -1091,16 +1090,11 @@ cleanup:
}
gss_release_buffer(&tmpmin, &mechtok_out);
if (ret == GSS_S_COMPLETE) {
- /*
- * Now, switch the output context to refer to the
- * negotiated mechanism's context.
- */
- *context_handle = (gss_ctx_id_t)spnego_ctx->ctx_handle;
+ spnego_ctx->opened = 1;
if (actual_mech != NULL)
*actual_mech = spnego_ctx->actual_mech;
if (ret_flags != NULL)
*ret_flags = spnego_ctx->ctx_flags;
- release_spnego_ctx(&spnego_ctx);
} else if (ret != GSS_S_CONTINUE_NEEDED) {
if (spnego_ctx != NULL) {
gss_delete_sec_context(&tmpmin,
@@ -1344,7 +1338,7 @@ acc_ctx_hints(OM_uint32 *minor_status,
if (ret != GSS_S_COMPLETE)
goto cleanup;
- sc = create_spnego_ctx();
+ sc = create_spnego_ctx(0);
if (sc == NULL) {
ret = GSS_S_FAILURE;
goto cleanup;
@@ -1426,7 +1420,7 @@ acc_ctx_new(OM_uint32 *minor_status,
gss_release_buffer(&tmpmin, &sc->DER_mechTypes);
assert(mech_wanted != GSS_C_NO_OID);
} else
- sc = create_spnego_ctx();
+ sc = create_spnego_ctx(0);
if (sc == NULL) {
ret = GSS_S_FAILURE;
*return_token = NO_TOKEN_SEND;
@@ -1809,13 +1803,12 @@ cleanup:
ret = GSS_S_FAILURE;
}
if (ret == GSS_S_COMPLETE) {
- *context_handle = (gss_ctx_id_t)sc->ctx_handle;
+ sc->opened = 1;
if (sc->internal_name != GSS_C_NO_NAME &&
src_name != NULL) {
*src_name = sc->internal_name;
sc->internal_name = GSS_C_NO_NAME;
}
- release_spnego_ctx(&sc);
} else if (ret != GSS_S_CONTINUE_NEEDED) {
if (sc != NULL) {
gss_delete_sec_context(&tmpmin, &sc->ctx_handle,
@@ -2128,8 +2121,13 @@ spnego_gss_unwrap(
gss_qop_t *qop_state)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_unwrap(minor_status,
- context_handle,
+ sc->ctx_handle,
input_message_buffer,
output_message_buffer,
conf_state,
@@ -2149,8 +2147,13 @@ spnego_gss_wrap(
gss_buffer_t output_message_buffer)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_wrap(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_req_flag,
qop_req,
input_message_buffer,
@@ -2167,8 +2170,14 @@ spnego_gss_process_context_token(
const gss_buffer_t token_buffer)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ /* SPNEGO doesn't have its own context tokens. */
+ if (!sc->opened)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
ret = gss_process_context_token(minor_status,
- context_handle,
+ sc->ctx_handle,
token_buffer);
return (ret);
@@ -2192,19 +2201,9 @@ spnego_gss_delete_sec_context(
if (*ctx == NULL)
return (GSS_S_COMPLETE);
- /*
- * If this is still an SPNEGO mech, release it locally.
- */
- if ((*ctx)->magic_num == SPNEGO_MAGIC_ID) {
- (void) gss_delete_sec_context(minor_status,
- &(*ctx)->ctx_handle,
- output_token);
- (void) release_spnego_ctx(ctx);
- } else {
- ret = gss_delete_sec_context(minor_status,
- context_handle,
- output_token);
- }
+ (void) gss_delete_sec_context(minor_status, &(*ctx)->ctx_handle,
+ output_token);
+ (void) release_spnego_ctx(ctx);
return (ret);
}
@@ -2216,8 +2215,13 @@ spnego_gss_context_time(
OM_uint32 *time_rec)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_context_time(minor_status,
- context_handle,
+ sc->ctx_handle,
time_rec);
return (ret);
}
@@ -2229,9 +2233,20 @@ spnego_gss_export_sec_context(
gss_buffer_t interprocess_token)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = *(spnego_gss_ctx_id_t *)context_handle;
+
+ /* We don't currently support exporting partially established
+ * contexts. */
+ if (!sc->opened)
+ return GSS_S_UNAVAILABLE;
+
ret = gss_export_sec_context(minor_status,
- context_handle,
+ &sc->ctx_handle,
interprocess_token);
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT) {
+ release_spnego_ctx(&sc);
+ *context_handle = GSS_C_NO_CONTEXT;
+ }
return (ret);
}
@@ -2241,11 +2256,12 @@ spnego_gss_import_sec_context(
const gss_buffer_t interprocess_token,
gss_ctx_id_t *context_handle)
{
- OM_uint32 ret;
- ret = gss_import_sec_context(minor_status,
- interprocess_token,
- context_handle);
- return (ret);
+ /*
+ * Until we implement partial context exports, there are no SPNEGO
+ * exported context tokens, only tokens for underlying mechs. So just
+ * return an error for now.
+ */
+ return GSS_S_UNAVAILABLE;
}
#endif /* LEAN_CLIENT */
@@ -2262,16 +2278,48 @@ spnego_gss_inquire_context(
int *opened)
{
OM_uint32 ret = GSS_S_COMPLETE;
+ spnego_gss_ctx_id_t sc = (spnego_gss_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_spnego;
+ if (ctx_flags != NULL)
+ *ctx_flags = 0;
+ if (locally_initiated != NULL)
+ *locally_initiated = sc->initiate;
+ if (opened != NULL)
+ *opened = sc->opened;
+
+ if (sc->ctx_handle != GSS_C_NO_CONTEXT) {
+ ret = gss_inquire_context(minor_status, sc->ctx_handle,
+ src_name, targ_name, lifetime_rec,
+ mech_type, ctx_flags, NULL, NULL);
+ }
- ret = gss_inquire_context(minor_status,
- context_handle,
- src_name,
- targ_name,
- lifetime_rec,
- mech_type,
- ctx_flags,
- locally_initiated,
- opened);
+ if (!sc->opened) {
+ /*
+ * We are still doing SPNEGO negotiation, so report SPNEGO as
+ * the OID. After negotiation is complete we will report the
+ * underlying mechanism OID.
+ */
+ if (mech_type != NULL)
+ *mech_type = (gss_OID)gss_mech_spnego;
+
+ /*
+ * Remove flags we don't support with partially-established
+ * contexts. (Change this to keep GSS_C_TRANS_FLAG if we add
+ * support for exporting partial SPNEGO contexts.)
+ */
+ if (ctx_flags != NULL) {
+ *ctx_flags &= ~GSS_C_PROT_READY_FLAG;
+ *ctx_flags &= ~GSS_C_TRANS_FLAG;
+ }
+ }
return (ret);
}
@@ -2286,8 +2334,13 @@ spnego_gss_wrap_size_limit(
OM_uint32 *max_input_size)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_wrap_size_limit(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_req_flag,
qop_req,
req_output_size,
@@ -2304,8 +2357,13 @@ spnego_gss_get_mic(
gss_buffer_t message_token)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_get_mic(minor_status,
- context_handle,
+ sc->ctx_handle,
qop_req,
message_buffer,
message_token);
@@ -2321,8 +2379,13 @@ spnego_gss_verify_mic(
gss_qop_t *qop_state)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_verify_mic(minor_status,
- context_handle,
+ sc->ctx_handle,
msg_buffer,
token_buffer,
qop_state);
@@ -2337,8 +2400,14 @@ spnego_gss_inquire_sec_context_by_oid(
gss_buffer_set_t *data_set)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ /* There are no SPNEGO-specific OIDs for this function. */
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_UNAVAILABLE);
+
ret = gss_inquire_sec_context_by_oid(minor_status,
- context_handle,
+ sc->ctx_handle,
desired_object,
data_set);
return (ret);
@@ -2407,8 +2476,15 @@ spnego_gss_set_sec_context_option(
const gss_buffer_t value)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)*context_handle;
+
+ /* There are no SPNEGO-specific OIDs for this function, and we cannot
+ * construct an empty SPNEGO context with it. */
+ if (sc == NULL || sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_UNAVAILABLE);
+
ret = gss_set_sec_context_option(minor_status,
- context_handle,
+ &sc->ctx_handle,
desired_object,
value);
return (ret);
@@ -2425,8 +2501,13 @@ spnego_gss_wrap_aead(OM_uint32 *minor_status,
gss_buffer_t output_message_buffer)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_wrap_aead(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_req_flag,
qop_req,
input_assoc_buffer,
@@ -2447,8 +2528,13 @@ spnego_gss_unwrap_aead(OM_uint32 *minor_status,
gss_qop_t *qop_state)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_unwrap_aead(minor_status,
- context_handle,
+ sc->ctx_handle,
input_message_buffer,
input_assoc_buffer,
output_payload_buffer,
@@ -2467,8 +2553,13 @@ spnego_gss_wrap_iov(OM_uint32 *minor_status,
int iov_count)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_wrap_iov(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_req_flag,
qop_req,
conf_state,
@@ -2486,8 +2577,13 @@ spnego_gss_unwrap_iov(OM_uint32 *minor_status,
int iov_count)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_unwrap_iov(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_state,
qop_state,
iov,
@@ -2505,8 +2601,13 @@ spnego_gss_wrap_iov_length(OM_uint32 *minor_status,
int iov_count)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_wrap_iov_length(minor_status,
- context_handle,
+ sc->ctx_handle,
conf_req_flag,
qop_req,
conf_state,
@@ -2523,8 +2624,13 @@ spnego_gss_complete_auth_token(
gss_buffer_t input_message_buffer)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_UNAVAILABLE);
+
ret = gss_complete_auth_token(minor_status,
- context_handle,
+ sc->ctx_handle,
input_message_buffer);
return (ret);
}
@@ -2776,8 +2882,13 @@ spnego_gss_pseudo_random(OM_uint32 *minor_status,
gss_buffer_t prf_out)
{
OM_uint32 ret;
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
ret = gss_pseudo_random(minor_status,
- context,
+ sc->ctx_handle,
prf_key,
prf_in,
desired_output_len,
@@ -2918,7 +3029,12 @@ spnego_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)
{
- return gss_get_mic_iov(minor_status, context_handle, qop_req, iov,
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
+ return gss_get_mic_iov(minor_status, sc->ctx_handle, qop_req, iov,
iov_count);
}
@@ -2927,7 +3043,12 @@ spnego_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)
{
- return gss_verify_mic_iov(minor_status, context_handle, qop_state, iov,
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
+ return gss_verify_mic_iov(minor_status, sc->ctx_handle, qop_state, iov,
iov_count);
}
@@ -2936,7 +3057,12 @@ spnego_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)
{
- return gss_get_mic_iov_length(minor_status, context_handle, qop_req, iov,
+ spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
+
+ if (sc->ctx_handle == GSS_C_NO_CONTEXT)
+ return (GSS_S_NO_CONTEXT);
+
+ return gss_get_mic_iov_length(minor_status, sc->ctx_handle, qop_req, iov,
iov_count);
}

65
gnu/packages/patches/mit-krb5-CVE-2015-2695-pt2.patch Normal file
View File

@ -0,0 +1,65 @@
Copied from Debian.
From 18c512ebdcc5cacc777e9dbcc6817f83c301ad93 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Wed, 4 Nov 2015 21:29:10 -0500
Subject: Fix SPNEGO context import
The patches for CVE-2015-2695 did not implement a SPNEGO
gss_import_sec_context() function, under the erroneous belief than an
exported SPNEGO context would be tagged with the underlying context
mechanism. Implement it now to allow SPNEGO contexts to be
successfully exported and imported after establishment.
ticket: 8273
(cherry picked from commit fbb565f913c52eba9bea82f1694aba7a8c90e93d)
Patch-Category: upstream
---
src/lib/gssapi/spnego/spnego_mech.c | 33 +++++++++++++++++++++++++++------
1 file changed, 27 insertions(+), 6 deletions(-)
diff --git a/src/lib/gssapi/spnego/spnego_mech.c b/src/lib/gssapi/spnego/spnego_mech.c
index a1072b0..02284a1 100644
--- a/src/lib/gssapi/spnego/spnego_mech.c
+++ b/src/lib/gssapi/spnego/spnego_mech.c
@@ -2256,12 +2256,33 @@ spnego_gss_import_sec_context(
const gss_buffer_t interprocess_token,
gss_ctx_id_t *context_handle)
{
- /*
- * Until we implement partial context exports, there are no SPNEGO
- * exported context tokens, only tokens for underlying mechs. So just
- * return an error for now.
- */
- return GSS_S_UNAVAILABLE;
+ OM_uint32 ret, tmpmin;
+ gss_ctx_id_t mctx;
+ spnego_gss_ctx_id_t sc;
+ int initiate, opened;
+
+ ret = gss_import_sec_context(minor_status, interprocess_token, &mctx);
+ if (ret != GSS_S_COMPLETE)
+ return ret;
+
+ ret = gss_inquire_context(&tmpmin, mctx, NULL, NULL, NULL, NULL, NULL,
+ &initiate, &opened);
+ if (ret != GSS_S_COMPLETE || !opened) {
+ /* We don't currently support importing partially established
+ * contexts. */
+ (void) gss_delete_sec_context(&tmpmin, &mctx, GSS_C_NO_BUFFER);
+ return GSS_S_FAILURE;
+ }
+
+ sc = create_spnego_ctx(initiate);
+ if (sc == NULL) {
+ (void) gss_delete_sec_context(&tmpmin, &mctx, GSS_C_NO_BUFFER);
+ return GSS_S_FAILURE;
+ }
+ sc->ctx_handle = mctx;
+ sc->opened = 1;
+ *context_handle = (gss_ctx_id_t)sc;
+ return GSS_S_COMPLETE;
}
#endif /* LEAN_CLIENT */

736
gnu/packages/patches/mit-krb5-CVE-2015-2696.patch Normal file
View File

@ -0,0 +1,736 @@
Copied from Debian.
From ebea85358bc72ec20c53130d83acb93f95853b76 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)
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 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);
+}

55
gnu/packages/patches/mit-krb5-CVE-2015-2697.patch Normal file
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@ -0,0 +1,55 @@
Copied from Debian.
From fcafb522a0509bfd6f4f6b57e4a1e93c0092eeb0 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Fri, 25 Sep 2015 12:51:47 -0400
Subject: Fix build_principal memory bug [CVE-2015-2697]
In build_principal_va(), use k5memdup0() instead of strdup() to make a
copy of the realm, to ensure that we allocate the correct number of
bytes and do not read past the end of the input string. This bug
affects krb5_build_principal(), krb5_build_principal_va(), and
krb5_build_principal_alloc_va(). krb5_build_principal_ext() is not
affected.
CVE-2015-2697:
In MIT krb5 1.7 and later, an authenticated attacker may be able to
cause a KDC to crash using a TGS request with a large realm field
beginning with a null byte. If the KDC attempts to find a referral to
answer the request, it constructs a principal name for lookup using
krb5_build_principal() with the requested realm. Due to a bug in this
function, the null byte causes only one byte be allocated for the
realm field of the constructed principal, far less than its length.
Subsequent operations on the lookup principal may cause a read beyond
the end of the mapped memory region, causing the KDC process to crash.
CVSSv2: AV:N/AC:L/Au:S/C:N/I:N/A:C/E:POC/RL:OF/RC:C
ticket: 8252 (new)
target_version: 1.14
tags: pullup
(cherry picked from commit f0c094a1b745d91ef2f9a4eae2149aac026a5789)
Patch-Category: upstream
---
src/lib/krb5/krb/bld_princ.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/src/lib/krb5/krb/bld_princ.c b/src/lib/krb5/krb/bld_princ.c
index ab6fed8..8604268 100644
--- a/src/lib/krb5/krb/bld_princ.c
+++ b/src/lib/krb5/krb/bld_princ.c
@@ -40,10 +40,8 @@ build_principal_va(krb5_context context, krb5_principal princ,
data = malloc(size * sizeof(krb5_data));
if (!data) { retval = ENOMEM; }
- if (!retval) {
- r = strdup(realm);
- if (!r) { retval = ENOMEM; }
- }
+ if (!retval)
+ r = k5memdup0(realm, rlen, &retval);
while (!retval && (component = va_arg(ap, char *))) {
if (count == size) {

43
gnu/packages/patches/mit-krb5-CVE-2015-2698-pt1.patch Normal file
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@ -0,0 +1,43 @@
Copied from Debian.
From 1a8bdc6d81dcd7dd8a4d42e8de6d2cacf1dd4408 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 27 Oct 2015 00:44:24 -0400
Subject: Fix two IAKERB comments
The comment explaining why there is no iakerb_gss_import_sec_context()
erroneously referenced SPNEGO instead of IAKERB (noticed by Ben
Kaduk). The comment above iakerb_gss_delete_sec_context() is out of
date after the last commit.
(cherry picked from commit 92d6dd045dfc06cc03d20b327a6ee7a71e6bc24d)
Patch-Category: upstream
---
src/lib/gssapi/krb5/iakerb.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/src/lib/gssapi/krb5/iakerb.c b/src/lib/gssapi/krb5/iakerb.c
index 4662bd9..e25862d 100644
--- a/src/lib/gssapi/krb5/iakerb.c
+++ b/src/lib/gssapi/krb5/iakerb.c
@@ -727,10 +727,6 @@ cleanup:
return code;
}
-/*
- * Delete an IAKERB context. This can also accept Kerberos context
- * handles. The heuristic is similar to SPNEGO's delete_sec_context.
- */
OM_uint32 KRB5_CALLCONV
iakerb_gss_delete_sec_context(OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
@@ -1077,7 +1073,7 @@ iakerb_gss_export_sec_context(OM_uint32 *minor_status,
}
/*
- * Until we implement partial context exports, there are no SPNEGO exported
+ * Until we implement partial context exports, there are no IAKERB 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.

132
gnu/packages/patches/mit-krb5-CVE-2015-2698-pt2.patch Normal file
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@ -0,0 +1,132 @@
Copied from Debian.
From 4b330d5be1f8048be4d079ac3cb38d60c0e99e69 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Wed, 4 Nov 2015 21:28:28 -0500
Subject: Fix IAKERB context export/import [CVE-2015-2698]
The patches for CVE-2015-2696 contained a regression in the newly
added IAKERB iakerb_gss_export_sec_context() function, which could
cause it to corrupt memory. Fix the regression by properly
dereferencing the context_handle pointer before casting it.
Also, the patches did not implement an IAKERB gss_import_sec_context()
function, under the erroneous belief than an exported IAKERB context
would be tagged as a krb5 context. Implement it now to allow IAKERB
contexts to be successfully exported and imported after establishment.
CVE-2015-2698:
In any MIT krb5 release with the patches for CVE-2015-2696 applied, an
application which calls gss_export_sec_context() may experience memory
corruption if the context was established using the IAKERB mechanism.
Historically, some vulnerabilities of this nature can be translated
into remote code execution, though the necessary exploits must be
tailored to the individual application and are usually quite
complicated.
CVSSv2 Vector: AV:N/AC:H/Au:S/C:C/I:C/A:C/E:POC/RL:OF/RC:C
ticket: 8273 (new)
target_version: 1.14
tags: pullup
(cherry picked from commit d8b31c874c7d1039be7649362ef11c89f4e14c27)
Patch-Category: upstream
---
src/lib/gssapi/krb5/gssapiP_krb5.h | 5 +++++
src/lib/gssapi/krb5/gssapi_krb5.c | 2 +-
src/lib/gssapi/krb5/iakerb.c | 42 +++++++++++++++++++++++++++++++-------
3 files changed, 41 insertions(+), 8 deletions(-)
diff --git a/src/lib/gssapi/krb5/gssapiP_krb5.h b/src/lib/gssapi/krb5/gssapiP_krb5.h
index 05dc321..ac53662 100644
--- a/src/lib/gssapi/krb5/gssapiP_krb5.h
+++ b/src/lib/gssapi/krb5/gssapiP_krb5.h
@@ -1396,6 +1396,11 @@ 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 KRB5_CALLCONV
+iakerb_gss_import_sec_context(OM_uint32 *minor_status,
+ const gss_buffer_t interprocess_token,
+ gss_ctx_id_t *context_handle);
#endif /* LEAN_CLIENT */
OM_uint32 KRB5_CALLCONV
diff --git a/src/lib/gssapi/krb5/gssapi_krb5.c b/src/lib/gssapi/krb5/gssapi_krb5.c
index 9a23656..d7ba279 100644
--- a/src/lib/gssapi/krb5/gssapi_krb5.c
+++ b/src/lib/gssapi/krb5/gssapi_krb5.c
@@ -945,7 +945,7 @@ static struct gss_config iakerb_mechanism = {
NULL,
#else
iakerb_gss_export_sec_context,
- NULL,
+ iakerb_gss_import_sec_context,
#endif
krb5_gss_inquire_cred_by_mech,
krb5_gss_inquire_names_for_mech,
diff --git a/src/lib/gssapi/krb5/iakerb.c b/src/lib/gssapi/krb5/iakerb.c
index e25862d..32a341e 100644
--- a/src/lib/gssapi/krb5/iakerb.c
+++ b/src/lib/gssapi/krb5/iakerb.c
@@ -1057,7 +1057,7 @@ iakerb_gss_export_sec_context(OM_uint32 *minor_status,
gss_buffer_t interprocess_token)
{
OM_uint32 maj;
- iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)context_handle;
+ iakerb_ctx_id_t ctx = (iakerb_ctx_id_t)*context_handle;
/* We don't currently support exporting partially established contexts. */
if (!ctx->established)
@@ -1072,13 +1072,41 @@ iakerb_gss_export_sec_context(OM_uint32 *minor_status,
return maj;
}
-/*
- * Until we implement partial context exports, there are no IAKERB 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.
- */
+OM_uint32 KRB5_CALLCONV
+iakerb_gss_import_sec_context(OM_uint32 *minor_status,
+ gss_buffer_t interprocess_token,
+ gss_ctx_id_t *context_handle)
+{
+ OM_uint32 maj, tmpmin;
+ krb5_error_code code;
+ gss_ctx_id_t gssc;
+ krb5_gss_ctx_id_t kctx;
+ iakerb_ctx_id_t ctx;
+
+ maj = krb5_gss_import_sec_context(minor_status, interprocess_token, &gssc);
+ if (maj != GSS_S_COMPLETE)
+ return maj;
+ kctx = (krb5_gss_ctx_id_t)gssc;
+
+ if (!kctx->established) {
+ /* We don't currently support importing partially established
+ * contexts. */
+ krb5_gss_delete_sec_context(&tmpmin, &gssc, GSS_C_NO_BUFFER);
+ return GSS_S_FAILURE;
+ }
+ code = iakerb_alloc_context(&ctx, kctx->initiate);
+ if (code != 0) {
+ krb5_gss_delete_sec_context(&tmpmin, &gssc, GSS_C_NO_BUFFER);
+ *minor_status = code;
+ return GSS_S_FAILURE;
+ }
+
+ ctx->gssc = gssc;
+ ctx->established = 1;
+ *context_handle = (gss_ctx_id_t)ctx;
+ return GSS_S_COMPLETE;
+}
#endif /* LEAN_CLIENT */
OM_uint32 KRB5_CALLCONV