PHP-FPM / Nginx安全在共享托管环境(Debian / Ubuntu)

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/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_basedirdisable_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

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。

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