Add option to specify the kerberos replay cache dir

Adds a configure option to set the distribution default as well as
an sssd.conf option to override it.

https://fedorahosted.org/sssd/ticket/980

7 files changed, 70 insertions, 0 deletions

diff --git a/src/conf_macros.m4 b/src/conf_macros.m4
index 1e503b3e..bd661ba3 100644
--- a/src/conf_macros.m4
+++ b/src/conf_macros.m4
@@ -204,6 +204,21 @@ AC_DEFUN([WITH_KRB5_PLUGIN_PATH],
     AC_SUBST(krb5pluginpath)
   ])
 
+AC_DEFUN([WITH_KRB5_RCACHE_DIR],
+  [ AC_ARG_WITH([krb5-rcache-dir],
+                [AC_HELP_STRING([--with-krb5-rcache-dir=PATH],
+                                [Path to store Kerberos replay caches [__LIBKRB5_DEFAULTS__]]
+                               )
+                ]
+               )
+    krb5rcachedir="__LIBKRB5_DEFAULTS__"
+    if test x"$with_krb5_rcache_dir" != x; then
+        krb5rcachedir=$with_krb5_rcache_dir
+    fi
+    AC_SUBST(krb5rcachedir)
+    AC_DEFINE_UNQUOTED(KRB5_RCACHE_DIR, "$krb5rcachedir", [Directory used for storing Kerberos replay caches])
+  ])
+
 AC_DEFUN([WITH_PYTHON_BINDINGS],
   [ AC_ARG_WITH([python-bindings],
                 [AC_HELP_STRING([--with-python-bindings],
diff --git a/src/confdb/confdb.h b/src/confdb/confdb.h
index 5e50991f..4d615761 100644
--- a/src/confdb/confdb.h
+++ b/src/confdb/confdb.h
@@ -63,6 +63,7 @@
 #define CONFDB_MONITOR_NAME_REGEX   "re_expression"
 #define CONFDB_MONITOR_FULL_NAME_FORMAT "full_name_format"
 #define CONFDB_MONITOR_TRY_INOTIFY "try_inotify"
+#define CONFDB_MONITOR_KRB5_RCACHEDIR "krb5_rcache_dir"
 
 /* NSS */
 #define CONFDB_NSS_CONF_ENTRY "config/nss"
diff --git a/src/config/SSSDConfig.py b/src/config/SSSDConfig.py
index 77a57c66..94d1f603 100644
--- a/src/config/SSSDConfig.py
+++ b/src/config/SSSDConfig.py
@@ -49,6 +49,7 @@ option_strings = {
     'sbus_timeout' : _('Timeout for messages sent over the SBUS'),
     're_expression' : _('Regex to parse username and domain'),
     'full_name_format' : _('Printf-compatible format for displaying fully-qualified names'),
+    'krb5_rcache_dir' : _('Directory on the filesystem where SSSD should store Kerberos replay cache files.'),
 
     # [nss]
     'enum_cache_timeout' : _('Enumeration cache timeout length (seconds)'),
diff --git a/src/config/SSSDConfigTest.py b/src/config/SSSDConfigTest.py
index 5b01b990..93b241b7 100755
--- a/src/config/SSSDConfigTest.py
+++ b/src/config/SSSDConfigTest.py
@@ -266,6 +266,7 @@ class SSSDConfigTestSSSDService(unittest.TestCase):
             'sbus_timeout',
             're_expression',
             'full_name_format',
+            'krb5_rcache_dir',
             'debug_level',
             'debug_timestamps',
             'debug_to_files',
diff --git a/src/config/etc/sssd.api.conf b/src/config/etc/sssd.api.conf
index ae9ba559..216766a5 100644
--- a/src/config/etc/sssd.api.conf
+++ b/src/config/etc/sssd.api.conf
@@ -17,6 +17,7 @@ timeout = int, None, false
 sbus_timeout = int, None, false
 re_expression = str, None, false
 full_name_format = str, None, false
+krb5_rcache_dir = str, None, false
 
 [nss]
 # Name service
diff --git a/src/man/sssd.conf.5.xml b/src/man/sssd.conf.5.xml
index 6f85dda9..dcbb5c1b 100644
--- a/src/man/sssd.conf.5.xml
+++ b/src/man/sssd.conf.5.xml
@@ -185,6 +185,26 @@
                             </para>
                         </listitem>
                     </varlistentry>
+                    <varlistentry>
+                        <term>krb5_rcache_dir (string)</term>
+                        <listitem>
+                            <para>
+                                Directory on the filesystem where SSSD should
+                                store Kerberos replay cache files.
+                            </para>
+                            <para>
+                                This option accepts a special value
+                                __LIBKRB5_DEFAULTS__ that will instruct SSSD
+                                to let libkrb5 decide the appropriate
+                                location for the replay cache.
+                            </para>
+                            <para>
+                                Default: Distribution-specific and specified
+                                at build-time. (__LIBKRB5_DEFAULTS__ if not
+                                configured)
+                            </para>
+                        </listitem>
+                    </varlistentry>
                 </variablelist>
             </para>
         </refsect2>
diff --git a/src/monitor/monitor.c b/src/monitor/monitor.c
index dd099841..0e16b78f 100644
--- a/src/monitor/monitor.c
+++ b/src/monitor/monitor.c
@@ -55,6 +55,11 @@
  * monitor will get crazy hammering children with messages */
 #define MONITOR_DEF_PING_TIME 10
 
+/* Special value to leave the Kerberos Replay Cache set to use
+ * the libkrb5 defaults
+ */
+#define KRB5_RCACHE_DIR_DISABLE "__LIBKRB5_DEFAULTS__"
+
 int cmdline_debug_level;
 int cmdline_debug_timestamps;
 
@@ -1926,8 +1931,34 @@ int monitor_process_init(struct mt_ctx *ctx,
     struct sysdb_ctx_list *db_list;
     struct tevent_signal *tes;
     struct sss_domain_info *dom;
+    char *rcachedir;
     int num_providers;
     int ret;
+    int error;
+
+    /* Set up the environment variable for the Kerberos Replay Cache */
+    ret = confdb_get_string(ctx->cdb, ctx,
+                            CONFDB_MONITOR_CONF_ENTRY,
+                            CONFDB_MONITOR_KRB5_RCACHEDIR,
+                            KRB5_RCACHE_DIR,
+                            &rcachedir);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    if (strcmp(rcachedir, KRB5_RCACHE_DIR_DISABLE) != 0)
+    {
+        errno = 0;
+        ret = setenv("KRB5RCACHEDIR", rcachedir, 1);
+        if (ret < 0) {
+            error = errno;
+            DEBUG(1,
+                  ("Unable to set KRB5RCACHEDIR: %s."
+                   "Will attempt to use libkrb5 defaults\n",
+                   strerror(error)));
+        }
+        talloc_zfree(rcachedir);
+    }
 
     /* Set up an event handler for a SIGHUP */
     tes = tevent_add_signal(ctx->ev, ctx, SIGHUP, 0,