376 lines
12 KiB
C++
376 lines
12 KiB
C++
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2022-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include "pam_instance.hh"
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#include <string>
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#include <string.h>
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#include <maxscale/jansson.hh>
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#include <maxscale/log.h>
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#include <maxscale/secrets.h>
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#include <maxscale/mysql_utils.hh>
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#define DEFAULT_PAM_DATABASE_NAME "file:pam.db?mode=memory&cache=shared"
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#define DEFAULT_PAM_TABLE_NAME "pam_users"
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using std::string;
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/**
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* Create an instance.
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*
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* @param options Listener options
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* @return New client authenticator instance or NULL on error
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*/
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PamInstance* PamInstance::create(char** options)
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{
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/** Name of the in-memory database */
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const string pam_db_name = DEFAULT_PAM_DATABASE_NAME;
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/** The table name where we store the users */
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const string pam_table_name = DEFAULT_PAM_TABLE_NAME;
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/** CREATE TABLE statement for the in-memory table */
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const string create_sql = string("CREATE TABLE IF NOT EXISTS ") + pam_table_name
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+ " (" + FIELD_USER + " varchar(255), " + FIELD_HOST + " varchar(255), "
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+ FIELD_DB + " varchar(255), " + FIELD_ANYDB + " boolean, "
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+ FIELD_AUTHSTR + " text);";
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if (sqlite3_threadsafe() == 0)
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{
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MXS_WARNING("SQLite3 was compiled with thread safety off. May cause "
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"corruption of in-memory database.");
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}
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bool error = false;
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/* This handle may be used from multiple threads, set full mutex. */
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sqlite3* dbhandle = NULL;
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int db_flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE
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| SQLITE_OPEN_SHAREDCACHE | SQLITE_OPEN_FULLMUTEX;
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if (sqlite3_open_v2(pam_db_name.c_str(), &dbhandle, db_flags, NULL) != SQLITE_OK)
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{
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MXS_ERROR("Failed to open SQLite3 handle.");
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error = true;
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}
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char* err;
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if (!error && sqlite3_exec(dbhandle, create_sql.c_str(), NULL, NULL, &err) != SQLITE_OK)
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{
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MXS_ERROR("Failed to create database: '%s'", err);
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sqlite3_free(err);
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error = true;
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}
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PamInstance* instance = NULL;
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if (!error
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&& ((instance = new(std::nothrow) PamInstance(dbhandle, pam_db_name, pam_table_name)) == NULL))
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{
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sqlite3_close_v2(dbhandle);
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}
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return instance;
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}
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/**
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* Constructor.
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*
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* @param dbhandle Database handle
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* @param dbname Text-form name of @c dbhandle
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* @param tablename Name of table where authentication data is saved
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*/
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PamInstance::PamInstance(sqlite3* dbhandle, const string& dbname, const string& tablename)
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: m_dbname(dbname)
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, m_tablename(tablename)
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, m_dbhandle(dbhandle)
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{
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}
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/**
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* @brief Add new PAM user entry to the internal user database
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*
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* @param user Username
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* @param host Host
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* @param db Database
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* @param anydb Global access to databases
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* @param pam_service The PAM service used
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*/
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void PamInstance::add_pam_user(const char* user,
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const char* host,
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const char* db,
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bool anydb,
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const char* pam_service)
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{
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/**
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* The insert query template which adds users to the pam_users table.
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*
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* Note that 'db' and 'pam_service' are strings that can be NULL and thus they have
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* no quotes around them. The quotes for strings are added in this function.
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*/
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const string insert_sql_template =
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"INSERT INTO " + m_tablename + " VALUES ('%s', '%s', %s, '%s', %s)";
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/** Used for NULL value creation in the INSERT query */
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const char NULL_TOKEN[] = "NULL";
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string db_str;
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if (db)
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{
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db_str = string("'") + db + "'";
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}
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else
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{
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db_str = NULL_TOKEN;
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}
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string service_str;
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if (pam_service && *pam_service)
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{
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service_str = string("'") + pam_service + "'";
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}
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else
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{
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service_str = NULL_TOKEN;
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}
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size_t len = insert_sql_template.length() + strlen(user) + strlen(host) + db_str.length()
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+ service_str.length() + 1;
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char insert_sql[len + 1];
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sprintf(insert_sql,
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insert_sql_template.c_str(),
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user,
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host,
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db_str.c_str(),
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anydb ? "1" : "0",
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service_str.c_str());
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char* err;
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if (sqlite3_exec(m_dbhandle, insert_sql, NULL, NULL, &err) != SQLITE_OK)
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{
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MXS_ERROR("Failed to insert user: %s", err);
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sqlite3_free(err);
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}
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}
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/**
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* @brief Delete old users from the database
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*/
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void PamInstance::delete_old_users()
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{
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/** Delete query used to clean up the database before loading new users */
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const string delete_query = "DELETE FROM " + m_tablename;
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char* err;
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if (sqlite3_exec(m_dbhandle, delete_query.c_str(), NULL, NULL, &err) != SQLITE_OK)
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{
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MXS_ERROR("Failed to delete old users: %s", err);
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sqlite3_free(err);
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}
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}
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/**
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* @brief Populates the internal user database by reading from one of the backend servers
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*
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* @param service The service the users should be read from
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*
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* @return MXS_AUTH_LOADUSERS_OK on success, MXS_AUTH_LOADUSERS_ERROR on error
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*/
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int PamInstance::load_users(SERVICE* service)
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{
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/** Query that gets all users that authenticate via the pam plugin */
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const char PAM_USERS_QUERY[] =
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"SELECT u.user, u.host, d.db, u.select_priv, u.authentication_string FROM "
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"mysql.user AS u LEFT JOIN mysql.db AS d ON (u.user = d.user AND u.host = d.host) WHERE "
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"(u.plugin = 'pam' AND (d.db IS NOT NULL OR u.select_priv = 'Y')) "
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"UNION "
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"SELECT u.user, u.host, t.db, u.select_priv, u.authentication_string FROM "
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"mysql.user AS u LEFT JOIN mysql.tables_priv AS t ON (u.user = t.user AND u.host = t.host) WHERE "
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"(u.plugin = 'pam' AND t.db IS NOT NULL AND u.select_priv = 'N') "
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"ORDER BY user";
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#if defined (SS_DEBUG)
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const unsigned int PAM_USERS_QUERY_NUM_FIELDS = 5;
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#endif
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const char* user;
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const char* password;
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serviceGetUser(service, &user, &password);
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int rval = MXS_AUTH_LOADUSERS_ERROR;
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char* pw;
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if ((pw = decrypt_password(password)))
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{
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for (SERVER_REF* servers = service->dbref; servers; servers = servers->next)
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{
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MYSQL* mysql = mysql_init(NULL);
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if (mxs_mysql_real_connect(mysql, servers->server, user, pw))
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{
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if (mysql_query(mysql, PAM_USERS_QUERY))
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{
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MXS_ERROR("Failed to query server '%s' for PAM users: '%s'.",
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servers->server->name,
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mysql_error(mysql));
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}
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else
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{
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MYSQL_RES* res = mysql_store_result(mysql);
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delete_old_users();
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if (res)
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{
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mxb_assert(mysql_num_fields(res) == PAM_USERS_QUERY_NUM_FIELDS);
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MXS_NOTICE("Loaded %llu users for service %s.",
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mysql_num_rows(res),
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service->name);
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MYSQL_ROW row;
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while ((row = mysql_fetch_row(res)))
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{
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add_pam_user(row[0],
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row[1],
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row[2],
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row[3] && strcasecmp(row[3], "Y") == 0,
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row[4]);
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}
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mysql_free_result(res);
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if (query_anon_proxy_user(servers->server, mysql))
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{
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rval = MXS_AUTH_LOADUSERS_OK;
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}
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}
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}
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mysql_close(mysql);
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if (rval == MXS_AUTH_LOADUSERS_OK)
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{
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break;
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}
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}
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}
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MXS_FREE(pw);
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}
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return rval;
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}
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void PamInstance::diagnostic(DCB* dcb)
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{
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json_t* array = diagnostic_json();
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mxb_assert(json_is_array(array));
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string result, separator;
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size_t index;
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json_t* value;
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json_array_foreach(array, index, value)
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{
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// Only print user@host for the non-json version, as this should fit nicely on the console. Add the
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// other fields if deemed useful.
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const char* user = json_string_value(json_object_get(value, FIELD_USER.c_str()));
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const char* host = json_string_value(json_object_get(value, FIELD_HOST.c_str()));
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if (user && host)
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{
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result += separator + user + "@" + host;
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separator = " ";
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}
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}
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if (!result.empty())
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{
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dcb_printf(dcb, "%s", result.c_str());
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}
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json_decref(array);
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}
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static int diag_cb_json(void* data, int columns, char** row, char** field_names)
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{
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mxb_assert(columns == NUM_FIELDS);
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json_t* obj = json_object();
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for (int i = 0; i < columns; i++)
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{
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json_object_set_new(obj, field_names[i], json_string(row[i]));
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}
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json_t* arr = static_cast<json_t*>(data);
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json_array_append_new(arr, obj);
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return 0;
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}
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json_t* PamInstance::diagnostic_json()
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{
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json_t* rval = json_array();
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char* err;
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string select = "SELECT * FROM " + m_tablename + ";";
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if (sqlite3_exec(m_dbhandle, select.c_str(), diag_cb_json, rval, &err) != SQLITE_OK)
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{
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MXS_ERROR("Failed to print users: %s", err);
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sqlite3_free(err);
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}
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return rval;
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}
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bool PamInstance::query_anon_proxy_user(SERVER* server, MYSQL* conn)
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{
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bool success = true;
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bool anon_user_found = false;
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string anon_pam_service;
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const char ANON_USER_QUERY[] = "SELECT authentication_string FROM mysql.user WHERE "
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"(plugin = 'pam' AND user = '' AND host = '%');";
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const char ANON_GRANT_QUERY[] = "SHOW GRANTS FOR ''@'%';";
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const char GRANT_PROXY[] = "GRANT PROXY ON";
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// Query for the anonymous user which is used with group mappings
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if (mysql_query(conn, ANON_USER_QUERY))
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{
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MXS_ERROR("Failed to query server '%s' for the anonymous PAM user: '%s'.",
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server->name,
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mysql_error(conn));
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success = false;
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}
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else
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{
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MYSQL_RES* res = mysql_store_result(conn);
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if (res)
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{
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MYSQL_ROW row = mysql_fetch_row(res);
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if (row)
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{
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anon_user_found = true;
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if (row[0])
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{
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anon_pam_service = row[0];
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}
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}
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mysql_free_result(res);
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}
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if (anon_user_found)
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{
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// Check that the anon user has a proxy grant
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if (mysql_query(conn, ANON_GRANT_QUERY))
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{
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MXS_ERROR("Failed to query server '%s' for the grants of the anonymous PAM user: '%s'.",
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server->name,
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mysql_error(conn));
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success = false;
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}
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else
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{
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if ((res = mysql_store_result(conn)))
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{
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MYSQL_ROW row;
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while ((row = mysql_fetch_row(res)))
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{
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if (row[0] && strncmp(row[0], GRANT_PROXY, sizeof(GRANT_PROXY) - 1) == 0)
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{
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MXS_NOTICE("Anonymous PAM user with proxy grant found. User account mapping "
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"enabled.");
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add_pam_user("", "%", NULL, false, anon_pam_service.c_str());
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}
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}
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mysql_free_result(res);
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}
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}
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}
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}
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return success;
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}
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