Fix race condition when creating/rotating keys

Resolves: rhbz#2182410
Resolves: CVE-2023-1672

Signed-off-by: Sergio Arroutbi <sarroutb@redhat.com>

0003-Fix-permissions-race-condition.patch

@@ -0,0 +1,31 @@
+--- tang-7.ori/src/tangd-keygen	2017-06-10 15:29:39.000000000 +0200
++++ tang-7/src/tangd-keygen	2023-06-28 11:40:01.700819479 +0200
+@@ -27,6 +27,8 @@
+ 
+ [ $# -eq 3 ] && sig=$2 && exc=$3
+ 
++# Set default umask for file creation.
++umask 0337
+ jwe=`jose jwk gen -i '{"alg":"ES512"}'`
+ [ -z "$sig" ] && sig=`echo "$jwe" | jose jwk thp -i-`
+ echo "$jwe" > $1/$sig.jwk
+--- tang-7.ori/src/keys.c	2023-06-28 09:57:08.706712410 +0200
++++ tang-7/src/keys.c	2023-06-28 11:43:41.742247417 +0200
+@@ -23,6 +23,7 @@
+ #include <jose/io.h>
+ #include <jansson.h>
+ #include <string.h>
++#include <sys/stat.h>
+ 
+ #include "util.h"
+ #include "keys.h"
+@@ -557,6 +558,9 @@
+     /* At this point, there are no keys, so let's create them. */
+     const char *alg[] = {"ES512", "ECMR", NULL};
+     char path[PATH_MAX];
++
++    /* Set default umask for file creation. */
++    umask(0337);
+     for (int i = 0; alg[i] != NULL; i++) {
+         struct tang_jwk *jwk __attribute__((cleanup(cleanup_tang_jwk))) = generate_new_tang_jwk(alg[i]);
+         if (!jwk) {

tang.spec

@@ -1,6 +1,6 @@
 Name:           tang
 Version:        7
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        Network Presence Binding Daemon
 
 License:        GPLv3+
@@ -8,6 +8,7 @@ URL:            https://github.com/latchset/%{name}
 Source0:        https://github.com/latchset/%{name}/releases/download/v%{version}/%{name}-%{version}.tar.bz2
 Patch1: 0001-Move-key-generation-to-tang.patch
 Patch2: 0002-Exit-with-success-unless-the-issue-was-with-with-tan.patch
+Patch3: 0003-Fix-permissions-race-condition.patch
 
 BuildRequires:  gcc
 BuildRequires:  autoconf
@@ -89,6 +90,11 @@ exit 0
 %{_mandir}/man1/tang-show-keys.1*
 
 %changelog
+* Wed Jun 28 2023 Sergio Arroutbi <sarroutb@redhat.com> - 7-7
+- Fix race condition when creating/rotating keys
+  Resolves: rhbz#2182410
+  Resolves: CVE-2023-1672
+
 * Wed Jan 13 2021 Sergio Correia <scorreia@redhat.com> - 7-6
 - Exit with success unless the issue was with with tangd itself
   Resolves: rhbz#1828558