libnm: don't check for valid passwords in NMSetting:verify()

We must never fail verification of a connection based on a password
because the password is re-requested during activation.

Otherwise, if the user enters an invalid password for a (previously)
valid connection, the connection becomes invalid. NetworkManager does
not expect or handle that requesting password can make a connection
invalid.
Invalid passwords should be treated as wrong passwords. Only a UI
(such as nm-connection-editor or nmcli) should validate passwords
against a certain scheme.

Note that there is need_secrets() which on the contrary must check for
valid passwords.

Error scenario:

  Connect to a WEP Wi-Fi, via `nmcli device wifi connect SSID`. The
  generated connection has wep-key-type=0 (UNKNOWN) and wep-key-flags=0.
  When trying to connect, NM will ask for secrets and set the wep-key0
  field. After that, verification can fail (e.g. if the password is longer
  then 64 chars).

4 files changed, 4 insertions, 81 deletions

diff --git a/libnm-util/nm-setting-adsl.c b/libnm-util/nm-setting-adsl.c
index 601ebc2b2a..5355011cd1 100644
--- a/libnm-util/nm-setting-adsl.c
+++ b/libnm-util/nm-setting-adsl.c
@@ -219,15 +219,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 		return FALSE;
 	}
 
-	if (priv->password && !strlen (priv->password)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_ADSL_ERROR,
-		                     NM_SETTING_ADSL_ERROR_INVALID_PROPERTY,
-		                     _("property is empty"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_ADSL_SETTING_NAME, NM_SETTING_ADSL_PASSWORD);
-		return FALSE;
-	}
-
 	if (   !priv->protocol
 	    || (   strcmp (priv->protocol, NM_SETTING_ADSL_PROTOCOL_PPPOA)
 	        && strcmp (priv->protocol, NM_SETTING_ADSL_PROTOCOL_PPPOE)
@@ -262,7 +253,7 @@ need_secrets (NMSetting *setting)
 	NMSettingAdslPrivate *priv = NM_SETTING_ADSL_GET_PRIVATE (setting);
 	GPtrArray *secrets = NULL;
 
-	if (priv->password)
+	if (priv->password && *priv->password)
 		return NULL;
 
 	if (!(priv->password_flags & NM_SETTING_SECRET_FLAG_NOT_REQUIRED)) {
diff --git a/libnm-util/nm-setting-cdma.c b/libnm-util/nm-setting-cdma.c
index 44a893c7bb..53f886ece3 100644
--- a/libnm-util/nm-setting-cdma.c
+++ b/libnm-util/nm-setting-cdma.c
@@ -181,15 +181,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 		return FALSE;
 	}
 
-	if (priv->password && !strlen (priv->password)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_CDMA_ERROR,
-		                     NM_SETTING_CDMA_ERROR_INVALID_PROPERTY,
-		                     _("property is empty"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_CDMA_SETTING_NAME, NM_SETTING_CDMA_PASSWORD);
-		return FALSE;
-	}
-
 	return TRUE;
 }
 
@@ -199,7 +190,7 @@ need_secrets (NMSetting *setting)
 	NMSettingCdmaPrivate *priv = NM_SETTING_CDMA_GET_PRIVATE (setting);
 	GPtrArray *secrets = NULL;
 
-	if (priv->password)
+	if (priv->password && *priv->password)
 		return NULL;
 
 	if (priv->username) {
diff --git a/libnm-util/nm-setting-gsm.c b/libnm-util/nm-setting-gsm.c
index 95c7a103df..e422c92e61 100644
--- a/libnm-util/nm-setting-gsm.c
+++ b/libnm-util/nm-setting-gsm.c
@@ -342,15 +342,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 		return FALSE;
 	}
 
-	if (priv->password && !strlen (priv->password)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_GSM_ERROR,
-		                     NM_SETTING_GSM_ERROR_INVALID_PROPERTY,
-		                     _("property is empty"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_GSM_SETTING_NAME, NM_SETTING_GSM_PASSWORD);
-		return FALSE;
-	}
-
 	if (priv->network_id) {
 		guint32 nid_len = strlen (priv->network_id);
 		guint32 i;
@@ -388,7 +379,7 @@ need_secrets (NMSetting *setting)
 	NMSettingGsmPrivate *priv = NM_SETTING_GSM_GET_PRIVATE (setting);
 	GPtrArray *secrets = NULL;
 
-	if (priv->password)
+	if (priv->password && *priv->password)
 		return NULL;
 
 	if (priv->username) {
diff --git a/libnm-util/nm-setting-wireless-security.c b/libnm-util/nm-setting-wireless-security.c
index 5e3456cebc..574ff3bd52 100644
--- a/libnm-util/nm-setting-wireless-security.c
+++ b/libnm-util/nm-setting-wireless-security.c
@@ -852,7 +852,7 @@ need_secrets (NMSetting *setting)
 	if (   priv->auth_alg
 	    && !strcmp (priv->auth_alg, "leap")
 	    && !strcmp (priv->key_mgmt, "ieee8021x")) {
-		if (!priv->leap_password || !strlen (priv->leap_password)) {
+		if (!priv->leap_password || !*priv->leap_password) {
 			g_ptr_array_add (secrets, NM_SETTING_WIRELESS_SECURITY_LEAP_PASSWORD);
 			return secrets;
 		}
@@ -923,14 +923,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 			g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_LEAP_USERNAME);
 			return FALSE;
 		}
-		if (priv->leap_password && !strlen (priv->leap_password)) {
-			g_set_error_literal (error,
-			                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-			                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-			                     _("property is empty"));
-			g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_LEAP_PASSWORD);
-			return FALSE;
-		}
 	} else {
 		if (   (strcmp (priv->key_mgmt, "ieee8021x") == 0)
 		    || (strcmp (priv->key_mgmt, "wpa-eap") == 0)) {
@@ -975,39 +967,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 		return FALSE;
 	}
 
-	if (priv->wep_key0 && !nm_utils_wep_key_valid (priv->wep_key0, priv->wep_key_type)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-		                     _("property is invalid"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_WEP_KEY0);
-		return FALSE;
-	}
-	if (priv->wep_key1 && !nm_utils_wep_key_valid (priv->wep_key1, priv->wep_key_type)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-		                     _("property is invalid"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_WEP_KEY1);
-		return FALSE;
-	}
-	if (priv->wep_key2 && !nm_utils_wep_key_valid (priv->wep_key2, priv->wep_key_type)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-		                     _("property is invalid"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_WEP_KEY2);
-		return FALSE;
-	}
-	if (priv->wep_key3 && !nm_utils_wep_key_valid (priv->wep_key3, priv->wep_key_type)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-		                     _("property is invalid"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_WEP_KEY3);
-		return FALSE;
-	}
-
 	if (priv->auth_alg && !_nm_utils_string_in_list (priv->auth_alg, valid_auth_algs)) {
 		g_set_error_literal (error,
 		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
@@ -1017,15 +976,6 @@ verify (NMSetting *setting, GSList *all_settings, GError **error)
 		return FALSE;
 	}
 
-	if (priv->psk && !nm_utils_wpa_psk_valid (priv->psk)) {
-		g_set_error_literal (error,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR,
-		                     NM_SETTING_WIRELESS_SECURITY_ERROR_INVALID_PROPERTY,
-		                     _("property is invalid"));
-		g_prefix_error (error, "%s.%s: ", NM_SETTING_WIRELESS_SECURITY_SETTING_NAME, NM_SETTING_WIRELESS_SECURITY_PSK);
-		return FALSE;
-	}
-
 	if (priv->proto && !_nm_utils_string_slist_validate (priv->proto, valid_protos)) {
 		g_set_error_literal (error,
 		                     NM_SETTING_WIRELESS_SECURITY_ERROR,