Sto cercando di fare uno screenshot usando PhantomJS sulla mia macchina CentOS 5, ma non riesco a farlo funzionare insieme a SELinux. Funziona su una macchina identica con SELinux disabilitato, quindi sospetto davvero che SELinux ne sia responsabile.
Ecco cosa ho provato (tutti i comandi sono stati eseguiti come root) e gli errori che ho riscontrato:
$ 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
Screenshot provato - fallito
$ 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
Ho provato a cambiare il tipo di phantomjs in 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
Schermata dei tentativi - non riuscita
$ 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
Ho provato a cambiare il tipo di phantomjs in 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
Ho provato a cambiare il tipo di phantomjs in 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
Schermata dei tentativi - non riuscita
$ 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
Ho provato a cambiare il tipo di phantomjs in 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
Ecco alcune ulteriori informazioni sulla mia configurazione 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
Qualcuno con esperienza SELinux / httpd sa se esiste un contesto adatto a ciò che sto cercando di fare? O forse dovrei mordere il proiettile e costruire una politica personalizzata per questo?