共享主机环境中的PHP-FPM / Nginx安全(Debian / Ubuntu)
如果要将nginx和PHP-FPM用于共享托管环境,您应该考虑安全性。 在Apache / PHP环境中,您可以使用suExec和/或suPHP使PHP在单个用户帐户下执行,而不是象www-data
这样的系统用户执行。 PHP-FPM没有这样的东西,但幸运的是,PHP-FPM允许我们为每个网站设置一个“池”,使PHP脚本作为该池中定义的用户/组来执行。 这为您提供了suPHP的所有好处,除此之外,您没有任何FTP或SCP传输问题,因为PHP脚本不需要由特定用户/组拥有,以作为用户/组定义执行在游泳池。
我不会保证这将为您工作!
1初步说明
我使用一个名为www.example.com
/ example.com
的虚拟主机,其中包含文档根/var/www/www.example.com/web
。
您应该有一个工作的LEMP安装,如这些教程所示:
Ubuntu用户注意事项:
因为我们必须使用root权限运行本教程的所有步骤,所以我们可以使用字符串sudo
在本教程中添加所有命令,也可以通过键入来成为root
sudo su
2我们拥有甚么
在Debian / Ubuntu上,PHP-FPM的池目录是/etc/php5/fpm/pool.d/
,这里将创建新的池。 PHP-FPM使用的php.ini
是/etc/php5/fpm/php.ini
。 已经有一个游泳池, www.conf-
我们来看看吧
vi /etc/php5/fpm/pool.d/www.conf
; Start a new pool named 'www'. ; the variable $pool can we used in any directive and will be replaced by the ; pool name ('www' here) [www] ; Per pool prefix ; It only applies on the following directives: ; - 'slowlog' ; - 'listen' (unixsocket) ; - 'chroot' ; - 'chdir' ; - 'php_values' ; - 'php_admin_values' ; When not set, the global prefix (or /usr) applies instead. ; Note: This directive can also be relative to the global prefix. ; Default Value: none ;prefix = /path/to/pools/$pool ; The address on which to accept FastCGI requests. ; Valid syntaxes are: ; 'ip.add.re.ss:port' - to listen on a TCP socket to a specific address on ; a specific port; ; 'port' - to listen on a TCP socket to all addresses on a ; specific port; ; '/path/to/unix/socket' - to listen on a unix socket. ; Note: This value is mandatory. listen = 127.0.0.1:9000 ; Set listen(2) backlog. A value of '-1' means unlimited. ; Default Value: 128 (-1 on FreeBSD and OpenBSD) ;listen.backlog = -1 ; List of ipv4 addresses of FastCGI clients which are allowed to connect. ; Equivalent to the FCGI_WEB_SERVER_ADDRS environment variable in the original ; PHP FCGI (5.2.2+). Makes sense only with a tcp listening socket. Each address ; must be separated by a comma. If this value is left blank, connections will be ; accepted from any ip address. ; Default Value: any ;listen.allowed_clients = 127.0.0.1 ; Set permissions for unix socket, if one is used. In Linux, read/write ; permissions must be set in order to allow connections from a web server. Many ; BSD-derived systems allow connections regardless of permissions. ; Default Values: user and group are set as the running user ; mode is set to 0666 ;listen.owner = www-data ;listen.group = www-data ;listen.mode = 0666 ; Unix user/group of processes ; Note: The user is mandatory. If the group is not set, the default user's group ; will be used. user = www-data group = www-data ; Choose how the process manager will control the number of child processes. ; Possible Values: ; static - a fixed number (pm.max_children) of child processes; ; dynamic - the number of child processes are set dynamically based on the ; following directives: ; pm.max_children - the maximum number of children that can ; be alive at the same time. ; pm.start_servers - the number of children created on startup. ; pm.min_spare_servers - the minimum number of children in 'idle' ; state (waiting to process). If the number ; of 'idle' processes is less than this ; number then some children will be created. ; pm.max_spare_servers - the maximum number of children in 'idle' ; state (waiting to process). If the number ; of 'idle' processes is greater than this ; number then some children will be killed. ; Note: This value is mandatory. pm = dynamic ; The number of child processes to be created when pm is set to 'static' and the ; maximum number of child processes to be created when pm is set to 'dynamic'. ; This value sets the limit on the number of simultaneous requests that will be ; served. Equivalent to the ApacheMaxClients directive with mpm_prefork. ; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP ; CGI. ; Note: Used when pm is set to either 'static' or 'dynamic' ; Note: This value is mandatory. pm.max_children = 50 ; The number of child processes created on startup. ; Note: Used only when pm is set to 'dynamic' ; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2 ;pm.start_servers = 20 ; The desired minimum number of idle server processes. ; Note: Used only when pm is set to 'dynamic' ; Note: Mandatory when pm is set to 'dynamic' pm.min_spare_servers = 5 ; The desired maximum number of idle server processes. ; Note: Used only when pm is set to 'dynamic' ; Note: Mandatory when pm is set to 'dynamic' pm.max_spare_servers = 35 ; The number of requests each child process should execute before respawning. ; This can be useful to work around memory leaks in 3rd party libraries. For ; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS. ; Default Value: 0 ;pm.max_requests = 500 ; The URI to view the FPM status page. If this value is not set, no URI will be ; recognized as a status page. By default, the status page shows the following ; information: ; accepted conn - the number of request accepted by the pool; ; pool - the name of the pool; ; process manager - static or dynamic; ; idle processes - the number of idle processes; ; active processes - the number of active processes; ; total processes - the number of idle + active processes. ; max children reached - number of times, the process limit has been reached, ; when pm tries to start more children (works only for ; pm 'dynamic') ; The values of 'idle processes', 'active processes' and 'total processes' are ; updated each second. The value of 'accepted conn' is updated in real time. ; Example output: ; accepted conn: 12073 ; pool: www ; process manager: static ; idle processes: 35 ; active processes: 65 ; total processes: 100 ; max children reached: 1 ; By default the status page output is formatted as text/plain. Passing either ; 'html' or 'json' as a query string will return the corresponding output ; syntax. Example: ; http://www.foo.bar/status ; http://www.foo.bar/status?json ; http://www.foo.bar/status?html ; Note: The value must start with a leading slash (/). The value can be ; anything, but it may not be a good idea to use the .php extension or it ; may conflict with a real PHP file. ; Default Value: not set ;pm.status_path = /status ; The ping URI to call the monitoring page of FPM. If this value is not set, no ; URI will be recognized as a ping page. This could be used to test from outside ; that FPM is alive and responding, or to ; - create a graph of FPM availability (rrd or such); ; - remove a server from a group if it is not responding (load balancing); ; - trigger alerts for the operating team (24/7). ; Note: The value must start with a leading slash (/). The value can be ; anything, but it may not be a good idea to use the .php extension or it ; may conflict with a real PHP file. ; Default Value: not set ;ping.path = /ping ; This directive may be used to customize the response of a ping request. The ; response is formatted as text/plain with a 200 response code. ; Default Value: pong ;ping.response = pong ; The timeout for serving a single request after which the worker process will ; be killed. This option should be used when the 'max_execution_time' ini option ; does not stop script execution for some reason. A value of '0' means 'off'. ; Available units: s(econds)(default), m(inutes), h(ours), or d(ays) ; Default Value: 0 ;request_terminate_timeout = 0 ; The timeout for serving a single request after which a PHP backtrace will be ; dumped to the 'slowlog' file. A value of '0s' means 'off'. ; Available units: s(econds)(default), m(inutes), h(ours), or d(ays) ; Default Value: 0 ;request_slowlog_timeout = 0 ; The log file for slow requests ; Default Value: not set ; Note: slowlog is mandatory if request_slowlog_timeout is set ;slowlog = log/$pool.log.slow ; Set open file descriptor rlimit. ; Default Value: system defined value ;rlimit_files = 1024 ; Set max core size rlimit. ; Possible Values: 'unlimited' or an integer greater or equal to 0 ; Default Value: system defined value ;rlimit_core = 0 ; Chroot to this directory at the start. This value must be defined as an ; absolute path. When this value is not set, chroot is not used. ; Note: you can prefix with '$prefix' to chroot to the pool prefix or one ; of its subdirectories. If the pool prefix is not set, the global prefix ; will be used instead. ; Note: chrooting is a great security feature and should be used whenever ; possible. However, all PHP paths will be relative to the chroot ; (error_log, sessions.save_path, ...). ; Default Value: not set ;chroot = ; Chdir to this directory at the start. ; Note: relative path can be used. ; Default Value: current directory or / when chroot chdir = / ; Redirect worker stdout and stderr into main error log. If not set, stdout and ; stderr will be redirected to /dev/null according to FastCGI specs. ; Note: on highloaded environement, this can cause some delay in the page ; process time (several ms). ; Default Value: no ;catch_workers_output = yes ; Pass environment variables like LD_LIBRARY_PATH. All $VARIABLEs are taken from ; the current environment. ; Default Value: clean env ;env[HOSTNAME] = $HOSTNAME ;env[PATH] = /usr/local/bin:/usr/bin:/bin ;env[TMP] = /tmp ;env[TMPDIR] = /tmp ;env[TEMP] = /tmp ; Additional php.ini defines, specific to this pool of workers. These settings ; overwrite the values previously defined in the php.ini. The directives are the ; same as the PHP SAPI: ; php_value/php_flag - you can set classic ini defines which can ; be overwritten from PHP call 'ini_set'. ; php_admin_value/php_admin_flag - these directives won't be overwritten by ; PHP call 'ini_set' ; For php_*flag, valid values are on, off, 1, 0, true, false, yes or no. ; Defining 'extension' will load the corresponding shared extension from ; extension_dir. Defining 'disable_functions' or 'disable_classes' will not ; overwrite previously defined php.ini values, but will append the new value ; instead. ; Note: path INI options can be relative and will be expanded with the prefix ; (pool, global or /usr) ; Default Value: nothing is defined by default except the values in php.ini and ; specified at startup with the -d argument ;php_admin_value[sendmail_path] = /usr/sbin/sendmail -t -i -f www@my.domain.com ;php_flag[display_errors] = off ;php_admin_value[error_log] = /var/log/fpm-php.www.log ;php_admin_flag[log_errors] = on ;php_admin_value[memory_limit] = 32M |
正如你所看到的,这个池正在本地主机( 127.0.0.1
)上的端口9000
上监听,它正以用户和组www-data
的身份运行。
我们来看看您的vhost中的PHP配置:
vi /etc/nginx/sites-available/example.com.vhost
server { [...] location ~ \.php$ { try_files $uri =404; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; include /etc/nginx/fastcgi_params; } [...] } |
重要的部分是fastcgi_pass
的行127.0.0.1:9000;
- 这使得nginx将PHP请求传递到在localhost( 127.0.0.1
)上监听端口9000
上的PHP-FPM进程 - 正如您所记住的那样,这是我们在/etc/php5/fpm/pool.d/www.conf
中定义的池意味着PHP脚本作为用户和组www-data执行
。
3定义每个网站的个人池
我的example.com
网站由用户web1
和group client0拥有
,所以我希望我的PHP脚本作为该用户和组执行。 因此我定义一个新的池/etc/php5/fpm/pool.d/example.com.conf
:
vi /etc/php5/fpm/pool.d/example.com.conf
[example.com] listen = 127.0.0.1:9001 listen.allowed_clients = 127.0.0.1 user = web1 group = client0 pm = dynamic pm.max_children = 50 pm.start_servers = 20 pm.min_spare_servers = 5 pm.max_spare_servers = 35 chdir = / |
正如你所看到的,我使这个池在端口9001
而不是9000
上监听,我将用户定义为web1
,组定义为client0
。 您可以根据需要定义尽可能多的池,但请确保为每个池使用未使用的端口( 9002,9003
等)。
重新加载PHP-FPM:
/etc/init.d/php5-fpm reload
现在我们更改我们的vhost配置,以利用新的池。 所有您需要更改的是fastcgi_pass
行中的端口:
vi /etc/nginx/sites-available/example.com.vhost
server { [...] location ~ \.php$ { try_files $uri =404; fastcgi_pass 127.0.0.1:9001; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; include /etc/nginx/fastcgi_params; } [...] } |
之后重新加载nginx:
/etc/init.d/nginx reload
而已! PHP脚本正在以用户web1
和组client0的形式执行
。
您可以通过为每个虚拟主机单独更改PHP设置来使PHP更加安全。 看看底下的/etc/php5/fpm/pool.d/www.conf
,它有一些如何实现的例子。
例如,您可以在/etc/php5/fpm/pool.d/example.com.conf
池中设置open_basedir
或disable_function
。
vi /etc/php5/fpm/pool.d/example.com.conf
[example.com] listen = 127.0.0.1:9001 listen.allowed_clients = 127.0.0.1 user = web1 group = client0 pm = dynamic pm.max_children = 50 pm.start_servers = 20 pm.min_spare_servers = 5 pm.max_spare_servers = 35 chdir = / php_admin_value[open_basedir] = /var/www/www.example.com:/usr/share/php5:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin php_admin_value[disable_functions] = dl,exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source |
重新加载PHP-FPM:
/etc/init.d/php5-fpm reload
3.1使用套接字代替TCP连接
到目前为止,我们已经为我们的PHP-FPM池( 127.0.0.1:9000,127.0.0.1:9001
等)使用了TCP连接。 这会导致一些开销。 幸运的是,我们可以使用Unix套接字代替我们的池的TCP连接,并摆脱这种开销。 因此,Unix套接字比TCP连接性能更高。
我想要在/ var / run / php5-fpm
目录中创建套接字,因此我们必须先创建该目录:
mkdir /var/run/php5-fpm
要使用Unix套接字,我们只需更改池定义中的listen
行,注释掉或删除listen.allowed_clients
行(仅适用于TCP连接),并添加行listen.owner
(定义套接字的所有者) , listen.group
(定义套接字组)和listen.mode
(定义套接字的权限):
vi /etc/php5/fpm/pool.d/example.com.conf
[example.com] listen = /var/run/php5-fpm/example.com.sock ;listen.allowed_clients = 127.0.0.1 listen.owner = web1 listen.group = client0 listen.mode = 0660 user = web1 group = client0 pm = dynamic pm.max_children = 50 pm.start_servers = 20 pm.min_spare_servers = 5 pm.max_spare_servers = 35 chdir = / |
之后重新加载PHP-FPM:
/etc/init.d/php5-fpm reload
看看/ var / run / php5-fpm
目录:
ls -l /var/run/php5-fpm
您应该找到套接字example.com.sock
,具有权限0660
,由用户web1
和组client0拥有
:
root@server1:~# ls -l /var/run/php5-fpm
total 0
srw-rw---- 1 web1 client0 0 2011-09-21 11:08 example.com.sock
root@server1:~#
最后,我们必须将我们的nginx vhost中的fastcgi_pass
行更改为fastcgi_pass unix:/var/run/php5-fpm/example.com.sock;
:
vi /etc/nginx/sites-available/example.com.vhost
server { [...] location ~ \.php$ { try_files $uri =404; fastcgi_pass unix:/var/run/php5-fpm/example.com.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; include /etc/nginx/fastcgi_params; } [...] } |
之后重新加载nginx:
/etc/init.d/nginx reload
而已!
4链接
- PHP-FPM: http : //php-fpm.org/
- nginx: http : //nginx.org/
- nginx维基: http : //wiki.nginx.org/
- Debian: http : //www.debian.org/
- Ubuntu: http : //www.ubuntu.com/
关于作者
Falko Timme是所有者 Timme Hosting (超快nginx网页托管)。 他是youcl(自2005年以来)的主要维护者, 也是ISPConfig的核心开发人员之一 (自2000年起)。 他还为O'Reilly的“Linux系统管理”一书作出了贡献。