MXS-2574: Add PATCH for /users/inet endpoint

The alteration of user passwords is now done inside MaxScale. This
prevents the possibility of a user locking themselves out.

include/maxscale/adminusers.h.in

@@ -71,6 +71,7 @@ const char* admin_disable_linux_account(const char *uname);
 bool admin_linux_account_enabled(const char *uname);
 
 const char* admin_add_inet_user(const char *uname, const char *password, enum user_account_type type);
+const char* admin_alter_inet_user(const char* uname, const char* password);
 const char* admin_remove_inet_user(const char* uname);
 bool admin_inet_user_exists(const char *uname);
 bool admin_verify_inet_user(const char *uname, const char *password);

include/maxscale/users.h

@@ -97,6 +97,17 @@ bool users_auth(USERS* users, const char* user, const char* password);
  */
 bool users_find(USERS* users, const char* user);
 
+/**
+ * Change password for a user
+ *
+ * @param users    The users table
+ * @param user     User to alter
+ * @param password The new password for the user
+ *
+ * @return True if password was changed
+ */
+bool users_change_password(USERS* users, const char* user, const char* password);
+
 /**
  * Check if user is an administrator
  *

maxctrl/lib/alter.js

@@ -192,10 +192,6 @@ exports.builder = function(yargs) {
         }, function(argv) {
             maxctrl(argv, function(host) {
 
-                if (argv.u == argv.name) {
-                    return error('Cannot alter current user')
-                }
-
                 var user = {
                     'data': {
                         'id': argv.name,
@@ -206,10 +202,7 @@ exports.builder = function(yargs) {
                     }
                 }
 
-                return getJson(host, 'users/inet/' + argv.name)
-                    .then((res) => user.data.attributes.account = res.data.attributes.account)
-                    .then(() => doRequest(host, 'users/inet/' + argv.name, null, {method: 'DELETE'}))
-                    .then(() => doRequest(host, 'users/inet', null, {method: 'POST', body: user}))
+                return doRequest(host, 'users/inet/' + argv.name, null, {method: 'PATCH', body: user})
             })
         })
         .usage('Usage: alter <command>')

maxctrl/test/alter.js

@@ -195,11 +195,6 @@ describe("Alter Commands", function() {
             .should.be.rejected
     })
 
-    it('rejects alteration to current user', function() {
-        return doCommand('-u bob -p bob alter user bob bob2')
-            .should.be.rejected
-    })
-
     it('creates user', function() {
         return verifyCommand('create user testuser test', 'users/inet/testuser')
     })
@@ -212,5 +207,13 @@ describe("Alter Commands", function() {
         return doCommand('destroy user testuser')
     })
 
+    it('allows alteration to current user', function() {
+        return verifyCommand('create user bob bob --type=admin', 'users/inet/bob')
+            .then(() => doCommand('-u bob -p bob alter user bob bob2'))
+            .then(() => doCommand('-u bob -p bob2 alter user bob bob'))
+            .then(() => doCommand('-u bob -p bob list servers'))
+            .then(() => doCommand('-u bob -p bob destroy user bob'))
+    })
+
     after(stopMaxScale)
 });

server/core/adminusers.cc

@@ -138,6 +138,29 @@ static const char* admin_add_user(USERS** pusers,
     return ADMIN_SUCCESS;
 }
 
+static const char* admin_alter_user(USERS** pusers,
+                                    const char* fname,
+                                    const char* uname,
+                                    const char* password)
+{
+    if (*pusers == NULL)
+    {
+        *pusers = users_alloc();
+    }
+
+    if (!users_change_password(*pusers, uname, password))
+    {
+        return ADMIN_ERR_USERNOTFOUND;
+    }
+
+    if (!admin_dump_users(*pusers, fname))
+    {
+        return ADMIN_ERR_FILEOPEN;
+    }
+
+    return ADMIN_SUCCESS;
+}
+
 static const char* admin_remove_user(USERS* users, const char* fname, const char* uname)
 {
     if (!users_delete(users, uname))
@@ -437,6 +460,19 @@ const char* admin_add_inet_user(const char* uname, const char* password, enum us
     return admin_add_user(&inet_users, INET_USERS_FILE_NAME, uname, password, type);
 }
 
+/**
+ * Alter network user.
+ *
+ * @param uname    The user to alter
+ * @param password The new password
+ *
+ * @return NULL on success or an error string on failure.
+ */
+const char* admin_alter_inet_user(const char* uname, const char* password)
+{
+    return admin_alter_user(&inet_users, INET_USERS_FILE_NAME, uname, password);
+}
+
 /**
  * Remove insecure remote (network) user
  *

server/core/config_runtime.cc

@@ -2875,6 +2875,31 @@ bool runtime_remove_user(const char* id, enum user_type type)
     return rval;
 }
 
+bool runtime_alter_user(const std::string& user, const std::string& type, json_t* json)
+{
+    bool rval = false;
+    const char* password = json_string_value(mxs_json_pointer(json, MXS_JSON_PTR_PASSWORD));
+
+    if (!password)
+    {
+        config_runtime_error("No password provided");
+    }
+    else if (type != CN_INET)
+    {
+        config_runtime_error("Users of type '%s' cannot be altered", type.c_str());
+    }
+    else if (const char* err = admin_alter_inet_user(user.c_str(), password))
+    {
+        config_runtime_error("%s", err);
+    }
+    else
+    {
+        rval = true;
+    }
+
+    return rval;
+}
+
 bool validate_maxscale_json(json_t* json)
 {
     bool rval = false;

server/core/internal/config_runtime.hh

@@ -386,6 +386,17 @@ bool runtime_create_user_from_json(json_t* json);
  */
 bool runtime_remove_user(const char* id, enum user_type type);
 
+/**
+ * @brief Alter admin user password
+ *
+ * @param user Username
+ * @param type Type of the user
+ * @param json JSON defining the new user
+ *
+ * @return True if the user was altered successfully
+ */
+bool runtime_alter_user(const std::string& user, const std::string& type, json_t* json);
+
 /**
  * @brief Alter core MaxScale parameters from JSON
  *

server/core/resource.cc

@@ -760,6 +760,7 @@ HttpResponse cb_monitor_wait(const HttpRequest& request)
     MonitorManager::debug_wait_one_tick();
     return HttpResponse(MHD_HTTP_OK);
 }
+
 HttpResponse cb_create_user(const HttpRequest& request)
 {
     mxb_assert(request.get_json());
@@ -772,6 +773,19 @@ HttpResponse cb_create_user(const HttpRequest& request)
     return HttpResponse(MHD_HTTP_FORBIDDEN, runtime_get_json_error());
 }
 
+HttpResponse cb_alter_user(const HttpRequest& request)
+{
+    auto user = request.last_uri_part();
+    auto type = request.uri_part(1);
+
+    if (runtime_alter_user(user, type, request.get_json()))
+    {
+        return HttpResponse(MHD_HTTP_NO_CONTENT);
+    }
+
+    return HttpResponse(MHD_HTTP_FORBIDDEN, runtime_get_json_error());
+}
+
 HttpResponse cb_delete_user(const HttpRequest& request)
 {
     string user = request.last_uri_part();
@@ -1044,6 +1058,7 @@ public:
         m_patch.push_back(SResource(new Resource(cb_alter_logs, 2, "maxscale", "logs")));
         m_patch.push_back(SResource(new Resource(cb_alter_maxscale, 1, "maxscale")));
         m_patch.push_back(SResource(new Resource(cb_alter_qc, 2, "maxscale", "query_classifier")));
+        m_patch.push_back(SResource(new Resource(cb_alter_user, 3, "users", "inet", ":inetuser")));
 
         /** Update resource relationships directly */
         m_patch.push_back(SResource(new Resource(cb_alter_server_service_relationship,

server/core/users.cc

@@ -327,6 +327,13 @@ bool users_find(USERS* users, const char* user)
     return u->get(user);
 }
 
+bool users_change_password(USERS* users, const char* user, const char* password)
+{
+    Users* u = reinterpret_cast<Users*>(users);
+    UserInfo info;
+    return u->get(user, &info) && u->remove(user) && u->add(user, password, info.permissions);
+}
+
 bool users_auth(USERS* users, const char* user, const char* password)
 {
     Users* u = reinterpret_cast<Users*>(users);