r22712: Inform the user when logging in via pam_winbind

and the krb5 tkt cache could not be created due to clock skew.
(This used to be commit 24616f7d6be40b090dc74851b1ea7d09d6976811)

4 files changed, 38 insertions, 0 deletions

diff --git a/source3/include/rpc_netlogon.h b/source3/include/rpc_netlogon.h
index 5c9e4c00d7..7bbd9cc1cb 100644
--- a/source3/include/rpc_netlogon.h
+++ b/source3/include/rpc_netlogon.h
@@ -89,6 +89,7 @@
 #define LOGON_RESOURCE_GROUPS		0x00000200
 #define LOGON_PROFILE_PATH_RETURNED	0x00000400
 #define LOGON_GRACE_LOGON		0x01000000
+#define LOGON_KRB5_FAIL_CLOCK_SKEW	0x02000000
 
 #define SE_GROUP_MANDATORY		0x00000001
 #define SE_GROUP_ENABLED_BY_DEFAULT	0x00000002
diff --git a/source3/nsswitch/pam_winbind.c b/source3/nsswitch/pam_winbind.c
index ec6361e52b..6734cba0c4 100644
--- a/source3/nsswitch/pam_winbind.c
+++ b/source3/nsswitch/pam_winbind.c
@@ -928,6 +928,30 @@ static void _pam_warn_logon_type(pam_handle_t *pamh, int ctrl, const char *usern
 }
 
 /**
+ * Send PAM_ERROR_MSG for krb5 errors.
+ *
+ * @param pamh PAM handle
+ * @param ctrl PAM winbind options.
+ * @param username User in PAM request.
+ * @param info3_user_flgs Info3 flags containing logon type bits.
+ *
+ * @return void.
+ */
+
+static void _pam_warn_krb5_failure(pam_handle_t *pamh, int ctrl, const char *username, uint32 info3_user_flgs)
+{
+	if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
+		_make_remark(pamh, ctrl, PAM_ERROR_MSG, 
+			     "Failed to establish your Kerberos Ticket cache "
+			     "due time differences\n" 
+			     "with the domain controller.  "
+			     "Please verify the system time.\n");		
+		_pam_log_debug(pamh, ctrl, LOG_DEBUG,
+			"User %s: Clock skew when getting Krb5 TGT\n", username);
+	}
+}
+
+/**
  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
  *
  * @param response The struct winbindd_response.
@@ -1125,6 +1149,9 @@ static int winbind_auth_request(pam_handle_t * pamh,
 		/* inform about logon type */
 		_pam_warn_logon_type(pamh, ctrl, user, response.data.auth.info3.user_flgs);
 
+		/* inform about krb5 failures */
+		_pam_warn_krb5_failure(pamh, ctrl, user, response.data.auth.info3.user_flgs);
+
 		/* set some info3 info for other modules in the stack */
 		_pam_set_data_info3(pamh, ctrl, &response);
 
diff --git a/source3/nsswitch/pam_winbind.h b/source3/nsswitch/pam_winbind.h
index 73da2826ca..9015869a77 100644
--- a/source3/nsswitch/pam_winbind.h
+++ b/source3/nsswitch/pam_winbind.h
@@ -184,6 +184,8 @@ do {                             \
 /* from include/rpc_netlogon.h */
 #define LOGON_CACHED_ACCOUNT		0x00000004
 #define LOGON_GRACE_LOGON		0x01000000
+#define LOGON_KRB5_FAIL_CLOCK_SKEW	0x02000000
 
 #define PAM_WB_CACHED_LOGON(x) (x & LOGON_CACHED_ACCOUNT)
+#define PAM_WB_KRB5_CLOCK_SKEW(x) (x & LOGON_KRB5_FAIL_CLOCK_SKEW)
 #define PAM_WB_GRACE_LOGON(x)  ((LOGON_CACHED_ACCOUNT|LOGON_GRACE_LOGON) == ( x & (LOGON_CACHED_ACCOUNT|LOGON_GRACE_LOGON)))
diff --git a/source3/nsswitch/winbindd_pam.c b/source3/nsswitch/winbindd_pam.c
index eb2da870c3..d9c9fe91cb 100644
--- a/source3/nsswitch/winbindd_pam.c
+++ b/source3/nsswitch/winbindd_pam.c
@@ -1326,6 +1326,7 @@ enum winbindd_result winbindd_dual_pam_auth(struct winbindd_domain *domain,
 					    struct winbindd_cli_state *state) 
 {
 	NTSTATUS result = NT_STATUS_LOGON_FAILURE;
+	NTSTATUS krb5_result = NT_STATUS_OK;	
 	fstring name_domain, name_user;
 	NET_USER_INFO_3 *info3 = NULL;
 	
@@ -1365,6 +1366,9 @@ enum winbindd_result winbindd_dual_pam_auth(struct winbindd_domain *domain,
 	if (domain->online && (state->request.flags & WBFLAG_PAM_KRB5)) {
 	
 		result = winbindd_dual_pam_auth_kerberos(domain, state, &info3);
+		/* save for later */
+		krb5_result = result;
+		
 
 		if (NT_STATUS_IS_OK(result)) {
 			DEBUG(10,("winbindd_dual_pam_auth_kerberos succeeded\n"));
@@ -1412,6 +1416,10 @@ sam_logon:
 	
 		if (NT_STATUS_IS_OK(result)) {
 			DEBUG(10,("winbindd_dual_pam_auth_samlogon succeeded\n"));
+			/* add the Krb5 err if we have one */
+			if ( NT_STATUS_EQUAL(krb5_result, NT_STATUS_TIME_DIFFERENCE_AT_DC ) ) {
+				info3->user_flgs |= LOGON_KRB5_FAIL_CLOCK_SKEW;				
+			}
 			goto process_result;
 		} else {
 			DEBUG(10,("winbindd_dual_pam_auth_samlogon failed: %s\n", nt_errstr(result)));