gnu: heimdal: Fix CVE-2017-{6594,11103}.

* gnu/packages/patches/heimdal-CVE-2017-6594.patch,
gnu/packages/patches/heimdal-CVE-2017-11103.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/kerberos.scm (heimdal)[source]: Use them.

1 files changed, 85 insertions, 0 deletions

diff --git a/gnu/packages/patches/heimdal-CVE-2017-6594.patch b/gnu/packages/patches/heimdal-CVE-2017-6594.patch
new file mode 100644
index 0000000000..714af60304
--- /dev/null
+++ b/gnu/packages/patches/heimdal-CVE-2017-6594.patch
@@ -0,0 +1,85 @@
+Fix CVE-2017-6594:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6594
+https://security-tracker.debian.org/tracker/CVE-2017-6594
+
+Patch lifted from upstream source repository:
+
+https://github.com/heimdal/heimdal/commit/b1e699103f08d6a0ca46a122193c9da65f6cf837
+
+To apply the patch to Heimdal 1.5.3 release tarball, the changes to 'NEWS' and
+files in 'tests/' are removed, and hunk #4 of 'kdc/krb5tgs.c' is modified.
+
+From b1e699103f08d6a0ca46a122193c9da65f6cf837 Mon Sep 17 00:00:00 2001
+From: Viktor Dukhovni <viktor@twosigma.com>
+Date: Wed, 10 Aug 2016 23:31:14 +0000
+Subject: [PATCH] Fix transit path validation CVE-2017-6594
+
+Commit f469fc6 (2010-10-02) inadvertently caused the previous hop realm
+to not be added to the transit path of issued tickets.  This may, in
+some cases, enable bypass of capath policy in Heimdal versions 1.5
+through 7.2.
+
+Note, this may break sites that rely on the bug.  With the bug some
+incomplete [capaths] worked, that should not have.  These may now break
+authentication in some cross-realm configurations.
+---
+ NEWS                   | 14 ++++++++++++++
+ kdc/krb5tgs.c          | 12 ++++++++++--
+ tests/kdc/check-kdc.in | 17 +++++++++++++++++
+ tests/kdc/krb5.conf.in |  4 ++++
+ 4 files changed, 45 insertions(+), 2 deletions(-)
+
+diff --git a/kdc/krb5tgs.c b/kdc/krb5tgs.c
+index 6048b9c55..98503812f 100644
+--- a/kdc/krb5tgs.c
++++ b/kdc/krb5tgs.c
+@@ -655,8 +655,12 @@ fix_transited_encoding(krb5_context context,
+ 		  "Decoding transited encoding");
+ 	return ret;
+     }
++
++    /*
++     * If the realm of the presented tgt is neither the client nor the server
++     * realm, it is a transit realm and must be added to transited set.
++     */
+     if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) {
+-	/* not us, so add the previous realm to transited set */
+ 	if (num_realms + 1 > UINT_MAX/sizeof(*realms)) {
+ 	    ret = ERANGE;
+ 	    goto free_realms;
+@@ -737,6 +741,7 @@ tgs_make_reply(krb5_context context,
+ 	       const char *server_name,
+ 	       hdb_entry_ex *client,
+ 	       krb5_principal client_principal,
++               const char *tgt_realm,
+ 	       hdb_entry_ex *krbtgt,
+ 	       krb5_enctype krbtgt_etype,
+ 	       krb5_principals spp,
+@@ -798,7 +803,7 @@ tgs_make_reply(krb5_context context,
+ 				 &tgt->transited, &et,
+ 				 krb5_principal_get_realm(context, client_principal),
+ 				 krb5_principal_get_realm(context, server->entry.principal),
+-				 krb5_principal_get_realm(context, krbtgt->entry.principal));
++				 tgt_realm);
+     if(ret)
+ 	goto out;
+ 
+@@ -1519,4 +1524,6 @@ tgs_build_reply(krb5_context context,
+     krb5_keyblock sessionkey;
+     krb5_kvno kvno;
+     krb5_data rspac;
++    const char *tgt_realm = /* Realm of TGT issuer */
++        krb5_principal_get_realm(context, krbtgt->entry.principal);
+
+@@ -2324,6 +2331,7 @@ server_lookup:
+ 			 spn,
+ 			 client,
+ 			 cp,
++                         tgt_realm,
+ 			 krbtgt_out,
+ 			 tkey_sign->key.keytype,
+ 			 spp,
+-- 
+2.13.3
+