我正在尝试在 CentOS 5 机器上使用 PhantomJS 截屏，但无法让它与 SELinux 协同工作。它在禁用 SELinux 的相同机器上工作正常，所以我真的怀疑 SELinux 是造成这种情况的原因。
这是我尝试过的（所有命令都以 root 身份运行）以及我遇到的错误：
$ ls -Z /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin
-rwxr-xr-x myusername myusername system_u:object_r:bin_t phantomjs
尝试截图 - 失败
$ cat /var/log/messages | grep avc
Sep 13 12:21:18 myserver kernel: type=1400 audit(1347531678.014:398): avc: denied { getattr } for pid=6842 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:18 myserver kernel: type=1400 audit(1347531678.014:399): avc: denied { getattr } for pid=6842 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:18 myserver kernel: type=1400 audit(1347531678.054:400): avc: denied { getattr } for pid=6852 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:18 myserver kernel: type=1400 audit(1347531678.054:401): avc: denied { getattr } for pid=6852 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:19 myserver kernel: type=1400 audit(1347531679.866:402): avc: denied { getattr } for pid=6864 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:19 myserver kernel: type=1400 audit(1347531679.867:403): avc: denied { getattr } for pid=6864 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:19 myserver kernel: type=1400 audit(1347531679.920:404): avc: denied { getattr } for pid=6874 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:19 myserver kernel: type=1400 audit(1347531679.920:405): avc: denied { getattr } for pid=6874 comm="sh" path="/sbin/ldconfig" dev=dm-0 ino=3097762 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:ldconfig_exec_t:s0 tclass=file
Sep 13 12:21:27 myserver kernel: type=1400 audit(1347531687.025:406): avc: denied { read } for pid=6890 comm="phantomjs" name="3830d5c3ddfd5cd38a049b759396e72e-x86-64.cache-2" dev=dm-0 ino=2021753 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file
Sep 13 12:21:27 myserver kernel: type=1400 audit(1347531687.035:407): avc: denied { write } for pid=6890 comm="phantomjs" name="myusername" dev=dm-0 ino=619658 scontext=system_u:system_r:httpd_t:s0 tcontext=user_u:object_r:user_home_dir_t:s0 tclass=dir
Sep 13 12:21:27 myserver kernel: type=1400 audit(1347531687.061:408): avc: denied { read } for pid=6890 comm="phantomjs" name="e3ead4b767b8819993a6fa3ae306afa9-x86-64.cache-2" dev=dm-0 ino=2021752 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file
Sep 13 12:21:28 myserver kernel: type=1400 audit(1347531688.720:410): avc: denied { execmem } for pid=6890 comm="phantomjs" scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:system_r:httpd_t:s0 tclass=process
尝试将 phantomjs 的类型更改为 httpd_sys_script_exec_t
$ chcon -v -t httpd_sys_script_exec_t /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs
$ ls -Z /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin
-rwxr-xr-x myusername myusername system_u:object_r:httpd_sys_script_exec_t phantomjs
重试截图 - 失败
$ cat /var/log/messages | grep avc
Sep 13 12:26:05 myserver kernel: type=1400 audit(1347531965.891:414): avc: denied { read } for pid=6962 comm="phantomjs" path="eventpoll:[9737788]" dev=eventpollfs ino=9737788 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:system_r:httpd_t:s0 tclass=file
Sep 13 12:26:05 myserver kernel: type=1400 audit(1347531965.892:415): avc: denied { write } for pid=6962 comm="phantomjs" path=2F7661722F72756E2F777367692E363535352E302E312E6C6F636B202864656C6574656429 dev=dm-0 ino=2022252 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:httpd_var_run_t:s0 tclass=file
Sep 13 12:26:05 myserver kernel: type=1400 audit(1347531965.892:416): avc: denied { write } for pid=6962 comm="phantomjs" path=2F7661722F72756E2F777367692E363535352E302E322E6C6F636B202864656C6574656429 dev=dm-0 ino=2022255 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:httpd_var_run_t:s0 tclass=file
Sep 13 12:26:05 myserver kernel: type=1400 audit(1347531965.892:417): avc: denied { write } for pid=6962 comm="phantomjs" path=2F7661722F72756E2F777367692E363535352E302E332E6C6F636B202864656C6574656429 dev=dm-0 ino=2022257 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:httpd_var_run_t:s0 tclass=file
Sep 13 12:26:05 myserver kernel: type=1400 audit(1347531965.893:418): avc: denied { write } for pid=6962 comm="phantomjs" path=2F7661722F72756E2F777367692E363535352E302E342E6C6F636B202864656C6574656429 dev=dm-0 ino=2022266 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:httpd_var_run_t:s0 tclass=file
尝试将 phantomjs 的类型更改为 httpd_t
$ chcon -v -t httpd_t /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs
failed to change context of /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs to system_u:object_r:httpd_t
chcon: failed to change context of /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs to system_u:object_r:httpd_t: Permission denied
尝试将 phantomjs 的类型更改为 httpd_var_run_t
$ chcon -v -t httpd_var_run_t /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs
$ ls -Z /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin
-rwxr-xr-x myusername myusername system_u:object_r:httpd_var_run_t phantomjs
重试截图 - 失败
$ cat /var/log/messages | grep avc
Sep 13 12:29:36 myserver kernel: type=1400 audit(1347532176.754:420): avc: denied { execute } for pid=7002 comm="httpd" name="phantomjs" dev=dm-0 ino=3032985 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:httpd_var_run_t:s0 tclass=file
尝试将 phantomjs 的类型更改为 httpd_sys_script_t
$ chcon -v -t httpd_sys_script_t /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs
failed to change context of /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs to system_u:object_r:httpd_sys_script_t
chcon: failed to change context of /usr/local/phantomjs/phantomjs-1.6.2-linux-x86_64-dynamic/bin/phantomjs to system_u:object_r:httpd_sys_script_t: Permission denied
以下是有关我的 SELinux 设置的更多信息：
$ sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: enforcing
Mode from config file: enforcing
Policy version: 21
Policy from config file: targeted
...
$ getsebool -a | grep http
allow_httpd_anon_write --> off
allow_httpd_bugzilla_script_anon_write --> off
allow_httpd_cvs_script_anon_write --> off
allow_httpd_mod_auth_pam --> off
allow_httpd_nagios_script_anon_write --> off
allow_httpd_prewikka_script_anon_write --> off
allow_httpd_squid_script_anon_write --> off
allow_httpd_sys_script_anon_write --> off
httpd_builtin_scripting --> on
httpd_can_network_connect --> off
httpd_can_network_connect_db --> off
httpd_can_network_relay --> off
httpd_can_sendmail --> on
httpd_disable_trans --> off
httpd_enable_cgi --> on
httpd_enable_ftp_server --> off
httpd_enable_homedirs --> on
httpd_execmem --> off
httpd_read_user_content --> off
httpd_rotatelogs_disable_trans --> off
httpd_setrlimit --> off
httpd_ssi_exec --> off
httpd_suexec_disable_trans --> off
httpd_tty_comm --> on
httpd_unified --> on
httpd_use_cifs --> off
httpd_use_nfs --> off
...
$ uname -r
2.6.18-308.1.1.el5
有 SELinux / httpd 经验的人知道是否有适合我所做操作的上下文吗？或者我应该咬紧牙关，为此制定一些自定义策略？
答案1
以下是一些片段http://wiki.centos.org/HowTos/SELinux#7有关如何使用创建自定义策略模块allow2audit。
尝试一下
setenforce 0
grep phantomjs /var/log/audit/audit.log | audit2allow -m httpd_phantomjs > httpd_phantomjs.te
cat httpd_phantomjs.te
安装
grep phantomjs /var/log/audit/audit.log | audit2allow -M httpd_phantomjs
semodule -i httpd_phantomjs.pp
ls /etc/selinux/targeted/modules/active/modules/ | grep httpd
测试一下
setenforce 1
tail -f /var/log/audit/audit.log
这尚未测试，因此请根据需要进行更新。希望它对你有用
答案2
刚刚遇到了同样的问题，并设法让 Phantom 在 Centos 7.4 上运行，而无需创建自定义策略。以下是我的做法。
bin_t通过将 phantomjs 文件更改为以下类型来更新 selinux 策略
semanage fcontext -a -t bin_t '/opt/phantomjs/bin/phantomjs'
向 selinux 策略添加新类型后，您需要更新文件权限
sudo /sbin/restorecon -v /opt/phantomjs/bin/phantomjs
现在您需要通过设置布尔值来允许 httpd 守护进程更改其资源限制
sudo setsebool -P httpd_setrlimit 1
希望能帮助到你 ：）