Como rodar o PhantomJS no CentOS com o SELinux?

Question

Estou tentando fazer uma captura de tela usando o PhantomJS na minha máquina do CentOS 5, mas não consigo trabalhar em conjunto com o SELinux. Ele funciona em uma máquina idêntica com o SELinux desabilitado, então eu realmente suspeito que o SELinux é responsável por isso.

Veja o que tentei (todos os comandos foram executados como root) e os erros que recebi:

$ 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

Captura de tela realizada - falha

$ 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

Tentei alterar o tipo de phantomjs para 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

Captura de tela da Retry - falha

$ 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

Tentei alterar o tipo de phantomjs para 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

Tentei alterar o tipo de phantomjs para 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

Captura de tela da Retry - falha

$ 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

Tentei alterar o tipo de phantomjs para 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

Aqui estão mais algumas informações sobre minha configuração do SELinux:

$ 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

Alguém com experiência em SELinux / httpd sabe se existe um contexto que combine com o que estou tentando fazer? Ou talvez eu deva morder a bala e construir alguma política personalizada para isso?

    

Answer 1

Veja alguns trechos do link sobre como criar um módulo de política personalizado com allow2audit .

Experimente

setenforce 0
grep phantomjs /var/log/audit/audit.log | audit2allow -m httpd_phantomjs > httpd_phantomjs.te
cat httpd_phantomjs.te

Instale-o

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

Teste-o

setenforce 1
tail -f /var/log/audit/audit.log

Isso não foi testado, portanto, atualize conforme necessário. Espero que funcione para você

    

Answer 2

Apenas tive o mesmo problema e consegui trabalhar de forma fantasma no Centos 7.4 sem ter que criar uma política personalizada. Veja como eu fiz isso.

Atualize a política do selinux alterando o arquivo phantomjs para bin_t type em semanage fcontext -a -t bin_t '/opt/phantomjs/bin/phantomjs'

Depois de adicionar um novo tipo à política do selinux, você precisa atualizar as permissões do arquivo | sudo /sbin/restorecon -v /opt/phantomjs/bin/phantomjs

Agora você precisa permitir que o daemon httpd altere seus limites de recursos configurando o valor booleano

sudo setsebool -P httpd_setrlimit 1

Espero que ajude:)