Add LDAP provider option to set LDAP_OPT_X_SASL_NOCANON

https://fedorahosted.org/sssd/ticket/978

8 files changed, 33 insertions, 3 deletions

diff --git a/src/config/SSSDConfig.py b/src/config/SSSDConfig.py
index 53bd14f0..77a57c66 100644
--- a/src/config/SSSDConfig.py
+++ b/src/config/SSSDConfig.py
@@ -149,6 +149,7 @@ option_strings = {
     'ldap_dns_service_name' : _('Service name for DNS service lookups'),
     'ldap_page_size' : _('The number of records to retrieve in a single LDAP query'),
     'ldap_deref_threshold' : _('The number of members that must be missing to trigger a full deref'),
+    'ldap_sasl_canonicalize' : _('Whether the LDAP library should perform a reverse lookup to canonicalize the host name during a SASL bind'),
 
     'ldap_entry_usn' : _('entryUSN attribute'),
     'ldap_rootdse_last_usn' : _('lastUSN attribute'),
diff --git a/src/config/etc/sssd.api.d/sssd-ldap.conf b/src/config/etc/sssd.api.d/sssd-ldap.conf
index 18321cad..78a7fa34 100644
--- a/src/config/etc/sssd.api.d/sssd-ldap.conf
+++ b/src/config/etc/sssd.api.d/sssd-ldap.conf
@@ -29,6 +29,7 @@ ldap_dns_service_name = str, None, false
 ldap_deref = str, None, false
 ldap_page_size = int, None, false
 ldap_deref_threshold = int, None, false
+ldap_sasl_canonicalize = bool, None, false
 
 [provider/ldap/id]
 ldap_search_timeout = int, None, false
diff --git a/src/man/sssd-ldap.5.xml b/src/man/sssd-ldap.5.xml
index 7c364abe..be1d333a 100644
--- a/src/man/sssd-ldap.5.xml
+++ b/src/man/sssd-ldap.5.xml
@@ -1104,6 +1104,20 @@
                 </varlistentry>
 
                 <varlistentry>
+                    <term>ldap_sasl_canonicalize (boolean)</term>
+                    <listitem>
+                        <para>
+                            If set to true, the LDAP library would perform
+                            a reverse lookup to canonicalize the host name
+                            during a SASL bind.
+                        </para>
+                        <para>
+                            Default: false;
+                        </para>
+                    </listitem>
+                </varlistentry>
+
+                <varlistentry>
                     <term>ldap_krb5_keytab (string)</term>
                     <listitem>
                         <para>
diff --git a/src/providers/ipa/ipa_common.c b/src/providers/ipa/ipa_common.c
index 7e548009..c6229456 100644
--- a/src/providers/ipa/ipa_common.c
+++ b/src/providers/ipa/ipa_common.c
@@ -97,7 +97,8 @@ struct dp_option ipa_def_ldap_opts[] = {
      */
     { "ldap_auth_disable_tls_never_use_in_production", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE },
     { "ldap_page_size", DP_OPT_NUMBER, { .number = 1000 }, NULL_NUMBER },
-    { "ldap_deref_threshold", DP_OPT_NUMBER, { .number = 10 }, NULL_NUMBER }
+    { "ldap_deref_threshold", DP_OPT_NUMBER, { .number = 10 }, NULL_NUMBER },
+    { "ldap_sasl_canonicalize", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE }
 };
 
 struct sdap_attr_map ipa_attr_map[] = {
diff --git a/src/providers/ipa/ipa_common.h b/src/providers/ipa/ipa_common.h
index 76336f3d..57591150 100644
--- a/src/providers/ipa/ipa_common.h
+++ b/src/providers/ipa/ipa_common.h
@@ -35,7 +35,7 @@ struct ipa_service {
 /* the following defines are used to keep track of the options in the ldap
  * module, so that if they change and ipa is not updated correspondingly
  * this will trigger a runtime abort error */
-#define IPA_OPTS_BASIC_TEST 51
+#define IPA_OPTS_BASIC_TEST 52
 
 /* the following define is used to keep track of the options in the krb5
  * module, so that if they change and ipa is not updated correspondingly
diff --git a/src/providers/ldap/ldap_common.c b/src/providers/ldap/ldap_common.c
index f26a428d..13ba9de6 100644
--- a/src/providers/ldap/ldap_common.c
+++ b/src/providers/ldap/ldap_common.c
@@ -88,7 +88,8 @@ struct dp_option default_basic_opts[] = {
      */
     { "ldap_auth_disable_tls_never_use_in_production", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE },
     { "ldap_page_size", DP_OPT_NUMBER, { .number = 1000 }, NULL_NUMBER },
-    { "ldap_deref_threshold", DP_OPT_NUMBER, { .number = 10 }, NULL_NUMBER }
+    { "ldap_deref_threshold", DP_OPT_NUMBER, { .number = 10 }, NULL_NUMBER },
+    { "ldap_sasl_canonicalize", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE }
 };
 
 struct sdap_attr_map generic_attr_map[] = {
diff --git a/src/providers/ldap/sdap.h b/src/providers/ldap/sdap.h
index baac956b..2e270f34 100644
--- a/src/providers/ldap/sdap.h
+++ b/src/providers/ldap/sdap.h
@@ -199,6 +199,7 @@ enum sdap_basic_opt {
     SDAP_DISABLE_AUTH_TLS,
     SDAP_PAGE_SIZE,
     SDAP_DEREF_THRESHOLD,
+    SDAP_SASL_CANONICALIZE,
 
     SDAP_OPTS_BASIC /* opts counter */
 };
diff --git a/src/providers/ldap/sdap_async_connection.c b/src/providers/ldap/sdap_async_connection.c
index 6f67700d..b391aa96 100644
--- a/src/providers/ldap/sdap_async_connection.c
+++ b/src/providers/ldap/sdap_async_connection.c
@@ -151,6 +151,7 @@ static void sdap_sys_connect_done(struct tevent_req *subreq)
     int ldap_deref_val;
     struct sdap_rebind_proc_params *rebind_proc_params;
     int sd;
+    bool sasl_nocanon;
 
     ret = sss_ldap_init_recv(subreq, &state->sh->ldap, &sd);
     talloc_zfree(subreq);
@@ -260,6 +261,16 @@ static void sdap_sys_connect_done(struct tevent_req *subreq)
 
     }
 
+    /* Set host name canonicalization for LDAP SASL bind */
+    sasl_nocanon = !dp_opt_get_bool(state->opts->basic, SDAP_SASL_CANONICALIZE);
+    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_X_SASL_NOCANON,
+                           sasl_nocanon ? LDAP_OPT_ON : LDAP_OPT_OFF);
+    if (lret != LDAP_OPT_SUCCESS) {
+        DEBUG(1, ("Failed to set LDAP SASL nocanon option to %s\n",
+                   sasl_nocanon ? "true" : "false"));
+        goto fail;
+    }
+
     /* if we do not use start_tls the connection is not really connected yet
      * just fake an async procedure and leave connection to the bind call */
     if (!state->use_start_tls) {