359 lines
9.9 KiB
C
359 lines
9.9 KiB
C
/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#define _XOPEN_SOURCE
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#include <unistd.h>
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#include <crypt.h>
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#include <users.h>
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#include <adminusers.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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/**
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* @file adminusers.c - Administration user account management
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 18/07/13 Mark Riddoch Initial implementation
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* 23/07/13 Mark Riddoch Addition of error mechanism to add user
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*
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* @endverbatim
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*/
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static USERS *loadUsers();
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static void initialise();
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static USERS *users = NULL;
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static int admin_init = 0;
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static char *ADMIN_ERR_NOMEM = "Out of memory";
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static char *ADMIN_ERR_FILEOPEN = "Unable to create password file";
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static char *ADMIN_ERR_DUPLICATE = "Duplicate username specified";
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static char *ADMIN_ERR_USERNOTFOUND = "User not found";
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static char *ADMIN_ERR_AUTHENTICATION = "Authentication failed";
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static char *ADMIN_ERR_FILEAPPEND = "Unable to append to password file";
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static char *ADMIN_ERR_PWDFILEOPEN = "Failed to open password file";
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static char *ADMIN_ERR_TMPFILEOPEN = "Failed to open temporary password file";
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static char *ADMIN_ERR_PWDFILEACCESS = "Failed to access password file";
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static char *ADMIN_ERR_DELLASTUSER = "Deleting user failed, deleting the "
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"last user is forbidden";
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static char *ADMIN_SUCCESS = NULL;
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static const int LINELEN=80;
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/**
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* Admin Users initialisation
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*/
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static void
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initialise()
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{
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if (admin_init)
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return;
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admin_init = 1;
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users = loadUsers();
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}
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/**
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* Verify a username and password
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*
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* @param username Username to verify
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* @param password Password to verify
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* @return Non-zero if the username/password combination is valid
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*/
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int
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admin_verify(char *username, char *password)
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{
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char *pw;
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initialise();
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if (users == NULL)
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{
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if (strcmp(username, "admin") == 0 && strcmp(password, "skysql") == 0)
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return 1;
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}
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else
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{
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if ((pw = users_fetch(users, username)) == NULL)
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return 0;
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if (strcmp(pw, crypt(password, ADMIN_SALT)) == 0)
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return 1;
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}
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return 0;
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}
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/**
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* Load the admin users
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*
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* @return Table of users
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*/
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static USERS *
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loadUsers()
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{
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USERS *rval;
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FILE *fp;
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char fname[1024], *home;
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char uname[80], passwd[80];
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initialise();
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if ((home = getenv("MAXSCALE_HOME")) != NULL)
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sprintf(fname, "%s/etc/passwd", home);
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else
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sprintf(fname, "/usr/local/skysql/MaxScale/etc/passwd");
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if ((fp = fopen(fname, "r")) == NULL)
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return NULL;
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if ((rval = users_alloc()) == NULL)
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return NULL;
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while (fscanf(fp, "%[^:]:%s\n", uname, passwd) == 2)
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{
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users_add(rval, uname, passwd);
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}
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fclose(fp);
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return rval;
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}
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/**
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* Add user
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*
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* @param uname Name of the new user
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* @param passwd Password for the new user
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* @return NULL on success or an error string on failure
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*/
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char *
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admin_add_user(char *uname, char *passwd)
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{
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FILE *fp;
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char fname[1024], *home, *cpasswd;
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initialise();
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if ((home = getenv("MAXSCALE_HOME")) != NULL)
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sprintf(fname, "%s/etc/passwd", home);
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else
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sprintf(fname, "/usr/local/skysql/MaxScale/etc/passwd");
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if (users == NULL)
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{
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skygw_log_write( LOGFILE_MESSAGE, "Create initial password file.\n");
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if ((users = users_alloc()) == NULL)
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return ADMIN_ERR_NOMEM;
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if ((fp = fopen(fname, "w")) == NULL)
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{
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skygw_log_write( LOGFILE_ERROR,
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"Unable to create password file %s.\n",
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fname);
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return ADMIN_ERR_PWDFILEOPEN;
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}
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fclose(fp);
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}
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if (users_fetch(users, uname) != NULL)
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{
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return ADMIN_ERR_DUPLICATE;
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}
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cpasswd = crypt(passwd, ADMIN_SALT);
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users_add(users, uname, cpasswd);
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if ((fp = fopen(fname, "a")) == NULL)
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{
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skygw_log_write( LOGFILE_ERROR,
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"Unable to append to password file %s.\n",
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fname);
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return ADMIN_ERR_FILEAPPEND;
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}
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fprintf(fp, "%s:%s\n", uname, cpasswd);
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fclose(fp);
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return ADMIN_SUCCESS;
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}
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/**
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* Remove maxscale user from in-memory structure and from password file
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*
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* @param uname Name of the new user
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* @param passwd Password for the new user
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* @return NULL on success or an error string on failure
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*/
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char* admin_remove_user(
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char* uname,
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char* passwd)
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{
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FILE* fp;
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FILE* fp_tmp;
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char fname[1024];
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char fname_tmp[1024];
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char* home;
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char fusr[LINELEN];
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char fpwd[LINELEN];
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char line[LINELEN];
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fpos_t rpos;
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int n_deleted;
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if (!admin_search_user(uname)) {
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skygw_log_write(
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LOGFILE_MESSAGE,
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"Couldn't find user %s. Removing user failed", uname);
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return ADMIN_ERR_USERNOTFOUND;
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}
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if (admin_verify(uname, passwd) == 0) {
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skygw_log_write(
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LOGFILE_MESSAGE,
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"Authentication failed, wrong user/password combination.\n"
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"Removing user failed");
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return ADMIN_ERR_AUTHENTICATION;
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}
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/** Remove user from in-memory structure */
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n_deleted = users_delete(users, uname);
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if (n_deleted == 0) {
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skygw_log_write(
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LOGFILE_MESSAGE,
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"Deleting the only user is forbidden. add new user "
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"before deleting the old one.\n");
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return ADMIN_ERR_DELLASTUSER;
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}
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/**
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* Open passwd file and remove user from the file.
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*/
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if ((home = getenv("MAXSCALE_HOME")) != NULL) {
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sprintf(fname, "%s/etc/passwd", home);
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sprintf(fname_tmp, "%s/etc/passwd_tmp", home);
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} else {
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sprintf(fname, "/usr/local/skysql/MaxScale/etc/passwd");
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sprintf(fname_tmp, "/usr/local/skysql/MaxScale/etc/passwd_tmp");
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}
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/**
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* Rewrite passwd file from memory.
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*/
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if ((fp = fopen(fname, "r")) == NULL)
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{
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int err = errno;
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skygw_log_write( LOGFILE_ERROR,
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"Unable to open password file %s : errno %d.\n"
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"Removing user from file failed; it must be done manually.",
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fname,
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err);
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return ADMIN_ERR_PWDFILEOPEN;
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}
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/**
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* Open temporary passwd file.
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*/
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if ((fp_tmp = fopen(fname_tmp, "w")) == NULL)
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{
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int err = errno;
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skygw_log_write( LOGFILE_ERROR,
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"Unable to open tmp file %s : errno %d.\n"
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"Removing user from passwd file failed; "
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"it must be done manually.",
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fname_tmp,
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err);
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fclose(fp);
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return ADMIN_ERR_TMPFILEOPEN;
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}
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/**
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* Scan passwd and copy all but matching lines to temp file.
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*/
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if (fgetpos(fp, &rpos) != 0) {
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int err = errno;
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skygw_log_write( LOGFILE_ERROR,
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"Unable to process passwd file %s : errno %d.\n"
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"Removing user from file failed, and must be done manually.",
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fname,
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err);
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return ADMIN_ERR_PWDFILEACCESS;
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}
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while (fscanf(fp, "%[^:]:%s\n", fusr, fpwd) == 2)
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{
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/**
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* Compare username what was found from passwd file.
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* Unmatching lines are copied to tmp file.
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*/
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if (strncmp(uname, fusr, strlen(uname)+1) != 0) {
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fsetpos(fp, &rpos); /** one step back */
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fgets(line, LINELEN, fp);
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fputs(line, fp_tmp);
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}
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if (fgetpos(fp, &rpos) != 0) {
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int err = errno;
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skygw_log_write( LOGFILE_ERROR,
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"Unable to process passwd file %s : errno %d.\n"
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"Removing user from file failed, and must be "
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"done manually.",
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fname,
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err);
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return ADMIN_ERR_PWDFILEACCESS;
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}
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}
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fclose(fp);
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/**
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* Replace original passwd file with new.
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*/
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if (rename(fname_tmp, fname)) {
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int err = errno;
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skygw_log_write( LOGFILE_ERROR,
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"Unable to rename new passwd file %s : errno %d.\n"
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"Rename it to %s manually.",
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fname_tmp,
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err,
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fname);
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return ADMIN_ERR_PWDFILEACCESS;
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}
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fclose(fp_tmp);
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return ADMIN_SUCCESS;
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}
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/**
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* Check for existance of the user
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*
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* @param user The user name to test
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* @return Non-zero if the user exists
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*/
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int
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admin_search_user(char *user)
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{
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initialise();
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if (users == NULL)
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return 0;
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return users_fetch(users, user) != NULL;
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}
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/**
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* Print the statistics and user names of the administration users
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*
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* @param dcb A DCB to send the output to
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*/
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void
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dcb_PrintAdminUsers(DCB *dcb)
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{
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if (users)
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dcb_usersPrint(dcb, users);
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else
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dcb_printf(dcb, "No administrtion users have been defined.\n");
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}
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