diff --git a/common/init.php b/common/init.php
index 93fb94e..b835dc6 100644
--- a/common/init.php
+++ b/common/init.php
@@ -6,6 +6,10 @@ define("SERVICE", substr(dirname($_SERVER['PHP_SELF']), strlen(CONF['common']['p
 define("PAGE", basename($_SERVER['PHP_SELF'], '.php'));
 define("DB_PATH", CONF['common']['root_path'] . "/db/niver.db"); // Niver's SQLite database
 
+define("PLACEHOLDER_DOMAIN", "example"); // From RFC2606: Reserved Top Level DNS Names > 2. TLDs for Testing, & Documentation Examples
+define("PLACEHOLDER_IPV6", "2001:db8::3"); // From RFC3849: IPv6 Address Prefix Reserved for Documentation
+define("PLACEHOLDER_IPV4", "203.0.113.42"); // From RFC5737: IPv4 Address Blocks Reserved for Documentation
+
 // Page titles definition
 require "pages.php";
 
diff --git a/common/pages.php b/common/pages.php
index eecab92..50cbfb4 100644
--- a/common/pages.php
+++ b/common/pages.php
@@ -92,12 +92,18 @@ switch (SERVICE) {
 			case "mkdir":
 				$page['title'] = "Créer un dossier de site";
 			break;
-			case "http-onion":
-				$page['title'] = "Accès HTTP par service Onion";
+			case "add-http-onion":
+				$page['title'] = "Ajouter un accès HTTP par Onion";
 			break;
-			case "https-domain":
-				$page['title'] = "Accès HTTP par DNS et TLS";
+			case "add-http-dns":
+				$page['title'] = "Ajouter un accès HTTP par DNS+TLS";
 			break;
+			case "del-http-onion":
+				$page['title'] = "Retirer un accès HTTP par Onion";
+				break;
+			case "del-http-dns":
+				$page['title'] = "Retirer un accès HTTP par DNS+TLS";
+				break;
 			case "le":
 				$page['title'] = "Installer un certificat Let's Encrypt";
 			break;
diff --git a/fn/auth.php b/fn/auth.php
index 40e3f95..e428c82 100644
--- a/fn/auth.php
+++ b/fn/auth.php
@@ -76,8 +76,8 @@ function changePassword($username, $password) {
 
 	$stmt = $db->prepare("UPDATE users SET password = :password WHERE username = :username");
 
-	$stmt->bindParam(':username', $username);
-	$stmt->bindParam(':password', $password);
+	$stmt->bindValue(':username', $username);
+	$stmt->bindValue(':password', $password);
 
 	$stmt->execute();
 }
diff --git a/fn/common.php b/fn/common.php
index 04a2f21..1525f03 100644
--- a/fn/common.php
+++ b/fn/common.php
@@ -22,3 +22,33 @@ function switchToFormProcess($requireLogin = true) {
 	if ($requireLogin AND !isset($_SESSION['username']))
 		userError("Vous devez être connecté·e pour effectuer cette action.");
 }
+
+function query($action, $table, $conditions = [], $column = NULL) {
+
+	$query = match ($action) {
+		'select' => 'SELECT *',
+		'delete' => 'DELETE',
+	};
+
+	$query .= " FROM $table";
+
+	foreach ($conditions as $key => $val) {
+		if ($key === array_key_first($conditions))
+			$query .= " WHERE $key = :$key";
+		else
+			$query .= " AND $key = :$key";
+	}
+
+	$db = new PDO('sqlite:' . DB_PATH);
+
+	$op = $db->prepare($query);
+
+	foreach ($conditions as $key => $val)
+		$op->bindValue(":$key", $val);
+
+	$op->execute();
+
+	if (isset($column))
+		return array_column($op->fetchAll(PDO::FETCH_ASSOC), $column);
+	return $op->fetchAll(PDO::FETCH_ASSOC);
+}
diff --git a/fn/dns.php b/fn/dns.php
index fe5cf00..6476942 100644
--- a/fn/dns.php
+++ b/fn/dns.php
@@ -1,9 +1,5 @@
 <?php
 
-define("PLACEHOLDER_DOMAIN", "example"); // From RFC2606: Reserved Top Level DNS Names > 2. TLDs for Testing, & Documentation Examples
-define("PLACEHOLDER_IPV6", "2001:db8::3"); // From RFC3849: IPv6 Address Prefix Reserved for Documentation
-define("PLACEHOLDER_IPV4", "203.0.113.42"); // From RFC5737: IPv4 Address Blocks Reserved for Documentation
-
 function knotcExec($suffix, $cmd) {
 	$action = checkAction($_POST['action']);
 
diff --git a/fn/ht.php b/fn/ht.php
index b85921b..048ca4d 100644
--- a/fn/ht.php
+++ b/fn/ht.php
@@ -8,7 +8,7 @@ function checkDomainFormat($domain) {
 
 function listFsDirs($username) {
 	$absoluteDirs = glob(CONF['ht']['ht_path'] . "/" . $username . "/*/", GLOB_ONLYDIR);
-	$dirs = array();
+	$dirs = [];
 	foreach ($absoluteDirs as $absoluteDir)
 		if (preg_match("/^[a-z0-9-]{1,32}$/", basename($absoluteDir)))
 			array_push($dirs, basename($absoluteDir));
@@ -20,69 +20,30 @@ function addSite($username, $siteDir, $domain, $domainType, $protocol) {
 
 	$op = $db->prepare("INSERT INTO sites(username, site_dir, domain, domain_type, protocol, creation_date, le_enabled) VALUES(:username, :site_dir, :domain, :domain_type, :protocol, :creation_date, :le_enabled)");
 
-	$time = date("Y-m-d H:i:s");
 	if ($domainType === "dns" AND $protocol === "http")
 		$le_enabled = 0;
 	else
 		$le_enabled = NULL;
 
-	$op->bindParam(':username', $username);
-	$op->bindParam(':site_dir', $siteDir);
-	$op->bindParam(':domain', $domain);
-	$op->bindParam(':domain_type', $domainType);
-	$op->bindParam(':protocol', $protocol);
-	$op->bindParam(':creation_date', $time);
-	$op->bindParam(':le_enabled', $le_enabled);
+	$op->bindValue(':username', $username);
+	$op->bindValue(':site_dir', $siteDir);
+	$op->bindValue(':domain', $domain);
+	$op->bindValue(':domain_type', $domainType);
+	$op->bindValue(':protocol', $protocol);
+	$op->bindValue(':creation_date', date("Y-m-d H:i:s"));
+	$op->bindValue(':le_enabled', $le_enabled);
 
 	$op->execute();
 }
 
-function listDbDirs($username, $domainType, $protocol) {
-	$db = new PDO('sqlite:' . DB_PATH);
-
-	$op = $db->prepare('SELECT site_dir FROM sites WHERE username = :username AND domain_type = :domain_type AND protocol = :protocol');
-	$op->bindParam(':username', $username);
-	$op->bindParam(':domain_type', $domainType);
-	$op->bindParam(':protocol', $protocol);
-	$op->execute();
-
-	return array_column($op->fetchAll(PDO::FETCH_ASSOC), 'site_dir');
-}
-
 function dirsStatuses($username, $domainType, $protocol) {
-	$dirs = array();
-	$fsDirs = listFsDirs($username);
-	$dbUsedDirs = listDbDirs($username, $domainType, $protocol);
-	foreach ($fsDirs as $fsDir)
-		$dirs[$fsDir] = ($dbUsedDirs AND in_array($fsDir, $dbUsedDirs));
+	$dbDirs = query('select', 'sites', [
+		'username' => $username,
+		'domain_type' => $domainType,
+		'protocol' => $protocol,
+	], 'site_dir');
+	$dirs = [];
+	foreach (listFsDirs($username) as $fsDir)
+		$dirs[$fsDir] = in_array($fsDir, $dbDirs);
 	return $dirs;
 }
-
-function selectSites($username, $domainType, $protocol, $onlyLeAvailable) {
-	$db = new PDO('sqlite:' . DB_PATH);
-
-	$query = "SELECT site_dir,domain FROM sites WHERE username = :username AND domain_type = :domain_type AND protocol = :protocol";
-
-	if ($onlyLeAvailable === true)
-		$query = $query . " AND le_enabled = 0";
-
-	$op = $db->prepare($query);
-	$op->bindParam(':username', $username);
-	$op->bindParam(':domain_type', $domainType);
-	$op->bindParam(':protocol', $protocol);
-	$op->execute();
-
-	$i = 0;
-	$entry = $op->fetch();
-	while (isset($entry['site_dir'])) {
-		$result[$i]["siteDir"] = $entry['site_dir'];
-		$result[$i]["domain"] = $entry['domain'];
-		$i++;
-		$entry = $op->fetch();
-	}
-
-	if (isset($result))
-		return $result;
-	else
-		return false;
-}
diff --git a/fn/ns.php b/fn/ns.php
index a7860d8..d63c87c 100644
--- a/fn/ns.php
+++ b/fn/ns.php
@@ -27,35 +27,12 @@ function nsParseCommonRequirements() {
 }
 
 function nsListUserZones($username) {
-	$db = new PDO('sqlite:' . DB_PATH);
-	$usernameArray[0] = $username;
-
-	$op = $db->prepare('SELECT zone FROM zones WHERE username = ?');
-	$op->execute($usernameArray);
-
-	$zones = array();
-	foreach ($op->fetchAll() as $zone)
-		array_push($zones, $zone['zone']);
-
-	return $zones;
+	return query('select', 'zones', ['username' => $username], 'zone');
 }
 
 function nsCheckZonePossession($submittedZone) {
 	checkAbsoluteDomainFormat($submittedZone);
 
-	$db = new PDO('sqlite:' . DB_PATH);
-	$username[0] = $_SESSION['username'];
-
-	$op = $db->prepare('SELECT zone FROM zones WHERE username = ?');
-	$op->execute($username);
-
-	$dbZone = $op->fetch()['zone'];
-
-	while ($dbZone != NULL) {
-		if ($dbZone === $submittedZone) return;
-		$dbZone = $op->fetch()['zone'];
-	}
-
-	// If there is no entry in the database for the user matching the submitted zone
-	userError("You don't own this zone on the nameserver.");
+	if (!in_array($submittedZone, query('select', 'zones', ['username' => $_SESSION['username']], 'zone'), true))
+		userError("You don't own this zone on the nameserver.");
 }
diff --git a/fn/reg.php b/fn/reg.php
index 2156eba..5c5e423 100644
--- a/fn/reg.php
+++ b/fn/reg.php
@@ -12,7 +12,7 @@ function regListUserDomains($username) {
 	$op = $db->prepare('SELECT domain FROM registry WHERE username = ?');
 	$op->execute($usernameArray);
 
-	$domains = array();
+	$domains = [];
 	foreach ($op->fetchAll() as $domain)
 		array_push($domains, $domain['domain']);
 
diff --git a/public/auth/register.php b/public/auth/register.php
index f0b3e5a..303bbf6 100644
--- a/public/auth/register.php
+++ b/public/auth/register.php
@@ -40,17 +40,13 @@ exec(CONF['ht']['sudo_path'] . " " . CONF['ht']['chgrp_path'] . " " . CONF['ht']
 if ($code !== 0)
 	serverError("Can't change user directory group.");
 
-$password = hashPassword($_POST['password']);
-
 $db = new PDO('sqlite:' . DB_PATH);
 
 $stmt = $db->prepare("INSERT INTO users(username, password, registration_date) VALUES(:username, :password, :registration_date)");
 
-$time = date("Y-m-d H:i:s");
-
-$stmt->bindParam(':username', $_POST['username']);
-$stmt->bindParam(':password', $password);
-$stmt->bindParam(':registration_date', $time);
+$stmt->bindValue(':username', $_POST['username']);
+$stmt->bindValue(':password', hashPassword($_POST['password']));
+$stmt->bindValue(':registration_date', date("Y-m-d H:i:s"));
 
 $stmt->execute();
 
diff --git a/public/ht/https-domain.php b/public/ht/add-http-dns.php
similarity index 100%
rename from public/ht/https-domain.php
rename to public/ht/add-http-dns.php
diff --git a/public/ht/http-onion.php b/public/ht/add-http-onion.php
similarity index 100%
rename from public/ht/http-onion.php
rename to public/ht/add-http-onion.php
diff --git a/public/ht/del-http-onion.php b/public/ht/del-http-onion.php
new file mode 100644
index 0000000..40ecc61
--- /dev/null
+++ b/public/ht/del-http-onion.php
@@ -0,0 +1,74 @@
+<?php require "../../common/html.php"; ?>
+<p>
+Ajouter un accès en .onion sur un dossier
+</p>
+
+<form method="post">
+	<label for="dir">Dossier ciblé</label><br>
+	<select required="" name="dir" id="dir">
+		<option value="" disabled="" selected="">---</option>
+
+<?php
+
+if (isset($_SESSION['username'])) {
+	$dirsStatuses = dirsStatuses($_SESSION['username'], "onion", "http");
+
+	foreach ($dirsStatuses as $dir => $alreadyEnabled) {
+		$disabled = $alreadyEnabled ? "" : "disabled='' ";
+		echo "		<option " . $disabled . "value='" . $dir . "'>" . $dir . "</option>\n";
+	}
+}
+
+?>
+
+	</select>
+	<br>
+	<input value="Valider" type="submit">
+</form>
+
+<?php
+
+switchToFormProcess();
+
+if ($dirsStatuses[$_POST['dir']] !== true)
+	userError("Wrong value for <code>dir</code>.");
+
+// Delete Tor config
+$torConf = file_get_contents(CONF['ht']['tor_config_path']);
+if ($torConf === false)
+	serverError("Failed to read current Tor configuration.");
+$torConf = str_replace("HiddenServiceDir " . CONF['ht']['tor_keys_path'] . "/" . $_POST['dir'] . "/
+HiddenServicePort 80 [::1]:" . CONF['ht']['internal_onion_http_port'] . "
+", "", $torConf);
+if (file_put_contents(CONF['ht']['tor_config_path'], $torConf) === false)
+	serverError("Failed to write new Tor configuration.");
+
+// Reload Tor
+exec(CONF['ht']['sudo_path'] . " " . CONF['ht']['systemctl_path'] . " reload " . CONF['ht']['tor_service'], $output, $code);
+if ($code !== 0)
+	serverError("Failed to reload Tor.");
+
+// Delete Nginx config
+$onion = query('select', 'sites', [
+	'username' => $_SESSION['username'],
+	'domain_type' => 'onion',
+	'protocol' => 'http',
+	'site_dir' => $_POST['dir'],
+], 'domain')[0];
+if (unlink(CONF['ht']['nginx_config_path'] . "/" . $onion . ".conf") !== true)
+	serverError("Failed to delete Nginx configuration.");
+
+// Reload Nginx
+exec(CONF['ht']['sudo_path'] . " " . CONF['ht']['systemctl_path'] . " reload nginx", result_code: $code);
+if ($code !== 0)
+	serverError("Failed to reload Nginx.");
+
+// Delete from database
+query('delete', 'sites', [
+	'username' => $_SESSION['username'],
+	'domain_type' => 'onion',
+	'protocol' => 'http',
+	'site_dir' => $_POST['dir'],
+]);
+
+success("Accès retiré avec succès.");
diff --git a/public/ht/index.php b/public/ht/index.php
index a0bdd88..2b96bc0 100644
--- a/public/ht/index.php
+++ b/public/ht/index.php
@@ -53,13 +53,21 @@
 </dl>
 
 <dl>
-	<dt><a href="http-onion">Accès HTTP par service Onion</a></dt>
+	<dt><a href="add-http-onion">Ajouter un accès HTTP par Onion</a></dt>
 	<dd>
-		Un site HTML, accessible par Tor, avec une adresse en .onion
+		Ajouter un accès HTTP par service Onion sur un sous-dossier de l'espace SFTP
 	</dd>
-	<dt><a href="https-domain">Accès HTTP par DNS et TLS</a></dt>
+	<dt><a href="add-http-dns">Ajouter un accès HTTP par DNS+TLS</a></dt>
 	<dd>
-		Un site HTML, accessible directement, par un nom de domaine
+		Ajouter un accès HTTP par DNS et TLS sur un sous-dossier de l'espace SFTP
+	</dd>
+	<dt><a href="del-http-onion">Retirer un accès HTTP par Onion</a></dt>
+	<dd>
+		Retirer un accès HTTP par service Onion d'un sous-dossier de l'espace SFTP
+	</dd>
+	<dt><a href="del-http-dns">Retirer un accès HTTP par DNS+TLS</a></dt>
+	<dd>
+		Retirer un accès HTTP par DNS et TLS d'un sous-dossier de l'espace SFTP
 	</dd>
 	<dt><a href="le">Let's Encrypt</a></dt>
 	<dd>
diff --git a/public/ns/zone.php b/public/ns/zone.php
index e624cee..039a308 100644
--- a/public/ns/zone.php
+++ b/public/ns/zone.php
@@ -16,8 +16,8 @@ if (isset($_POST['domain']) AND isset($_SESSION['username'])) {
 	$db = new PDO('sqlite:' . DB_PATH);
 	$stmt = $db->prepare("INSERT INTO zones(zone, username) VALUES(:zone, :username)");
 
-	$stmt->bindParam(':zone', $_POST['domain']);
-	$stmt->bindParam(':username', $_SESSION['username']);
+	$stmt->bindValue(':zone', $_POST['domain']);
+	$stmt->bindValue(':username', $_SESSION['username']);
 
 	$stmt->execute();
 
@@ -79,8 +79,8 @@ if (isset($_POST['zone']) AND isset($_SESSION['username'])) {
 	$db = new PDO('sqlite:' . DB_PATH);
 	$stmt = $db->prepare("DELETE FROM zones WHERE zone = :zone AND username = :username");
 
-	$stmt->bindParam(':zone', $_POST['zone']);
-	$stmt->bindParam(':username', $_SESSION['username']);
+	$stmt->bindValue(':zone', $_POST['zone']);
+	$stmt->bindValue(':username', $_SESSION['username']);
 
 	$stmt->execute();
 
diff --git a/public/reg/register.php b/public/reg/register.php
index 5f2cd20..9003172 100644
--- a/public/reg/register.php
+++ b/public/reg/register.php
@@ -30,11 +30,9 @@ if (regIsFree($domain) !== true)
 $db = new PDO('sqlite:' . DB_PATH);
 $stmt = $db->prepare("INSERT INTO registry(domain, username, last_renewal) VALUES(:domain, :username, :last_renewal)");
 
-$time = date("Y-m-d H:i:s");
-
-$stmt->bindParam(':domain', $domain);
-$stmt->bindParam(':username', $_SESSION['username']);
-$stmt->bindParam(':last_renewal', $time);
+$stmt->bindValue(':domain', $domain);
+$stmt->bindValue(':username', $_SESSION['username']);
+$stmt->bindValue(':last_renewal', date("Y-m-d H:i:s"));
 
 $stmt->execute();
 
diff --git a/public/reg/unregister.php b/public/reg/unregister.php
index 9bc3235..42e88b4 100644
--- a/public/reg/unregister.php
+++ b/public/reg/unregister.php
@@ -34,8 +34,8 @@ if (file_put_contents(CONF['reg']['registry_file'], $regFile) === false)
 $db = new PDO('sqlite:' . DB_PATH);
 $stmt = $db->prepare("DELETE FROM registry WHERE domain = :domain AND username = :username");
 
-$stmt->bindParam(':domain', $_POST['domain']);
-$stmt->bindParam(':username', $_SESSION['username']);
+$stmt->bindValue(':domain', $_POST['domain']);
+$stmt->bindValue(':username', $_SESSION['username']);
 
 $stmt->execute();