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Top Forums UNIX for Advanced & Expert Users CentOS7 restoring file capabilities Post 303025724 by rbatte1 on Saturday 10th of November 2018 12:42:02 PM
Old 11-10-2018
Yes, we'd tried that without success. I hadn't considered the other file attributes options though. Sadly, it seems no better. A simple test just on CentOS7 gives me this:-
Code:
# tar -cvpzf - --xattrs --acl --selinux /usr/bin/ping | (cd /tmp;tar -xzvp --xattrs --acl --selinux  -f -)
tar: Removing leading `/' from member names
/usr/bin/ping
usr/bin/ping
# getcap -v /usr/bin/ping /tmp/usr/bin/ping
/usr/bin/ping = cap_net_admin,cap_net_raw+p
/tmp/usr/bin/ping

Am I doing something daft? At worst I've scanned all local files and collected the capabilities into a file that then is part of the tarball. On recovery I can apply them within my kickstart file. It's just more steps to wory about.

I have found that simply copying a file loses the capabilities, one has to cp --preserve=xattr source target Maybe I don't understand where these are stored. Maybe I don't need to know, just understand the rules I need to follow Smilie

I know I can achieve it with rsync but I can't neatly use that when doing a PXE recovery and I'd have to get the files out to all the remote locations individually too, which would be a nightmare.

I will keep digging. Any other suggestions to explore very welcome.



Kind regards,
Robin
 

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ping_selinux(8) 						SELinux Policy ping						   ping_selinux(8)

NAME
ping_selinux - Security Enhanced Linux Policy for the ping processes DESCRIPTION
Security-Enhanced Linux secures the ping processes via flexible mandatory access control. The ping processes execute with the ping_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. For example: ps -eZ | grep ping_t ENTRYPOINTS
The ping_t SELinux type can be entered via the ping_exec_t file type. The default entrypoint paths for the ping_t domain are the following: /bin/ping.*, /usr/bin/ping.*, /usr/sbin/fping.*, /usr/sbin/hping2, /usr/sbin/send_arp, /usr/lib/heartbeat/send_arp PROCESS TYPES
SELinux defines process types (domains) for each process running on the system You can see the context of a process using the -Z option to ps Policy governs the access confined processes have to files. SELinux ping policy is very flexible allowing users to setup their ping pro- cesses in as secure a method as possible. The following process types are defined for ping: ping_t, pingd_t Note: semanage permissive -a ping_t can be used to make the process type ping_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. BOOLEANS
SELinux policy is customizable based on least access required. ping policy is extremely flexible and has several booleans that allow you to manipulate the policy and run ping with the tightest access possible. If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlo- gin_nsswitch_use_ldap boolean. Disabled by default. setsebool -P authlogin_nsswitch_use_ldap 1 If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default. setsebool -P daemons_use_tty 1 If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default. setsebool -P deny_ptrace 1 If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default. setsebool -P domain_fd_use 1 If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default. setsebool -P domain_kernel_load_modules 1 If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default. setsebool -P fips_mode 1 If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default. setsebool -P global_ssp 1 If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default. setsebool -P kerberos_enabled 1 If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default. setsebool -P nis_enabled 1 If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default. setsebool -P nscd_use_shm 1 If you want to allow confined users the ability to execute the ping and traceroute commands, you must turn on the selinuxuser_ping boolean. Enabled by default. setsebool -P selinuxuser_ping 1 NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server for the pingd_t, ping_t, you must turn on the authlogin_nsswitch_use_ldap boolean. setsebool -P authlogin_nsswitch_use_ldap 1 If you want to allow confined applications to run with kerberos for the pingd_t, ping_t, you must turn on the kerberos_enabled boolean. setsebool -P kerberos_enabled 1 PORT TYPES
SELinux defines port types to represent TCP and UDP ports. You can see the types associated with a port by using the following command: semanage port -l Policy governs the access confined processes have to these ports. SELinux ping policy is very flexible allowing users to setup their ping processes in as secure a method as possible. The following port types are defined for ping: pingd_port_t Default Defined Ports: tcp 9125 FILE CONTEXTS
SELinux requires files to have an extended attribute to define the file type. You can see the context of a file using the -Z option to ls Policy governs the access confined processes have to these files. SELinux ping policy is very flexible allowing users to setup their ping processes in as secure a method as possible. STANDARD FILE CONTEXT SELinux defines the file context types for the ping, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk. semanage fcontext -a -t ping_exec_t '/srv/ping/content(/.*)?' restorecon -R -v /srv/myping_content Note: SELinux often uses regular expressions to specify labels that match multiple files. The following file types are defined for ping: ping_exec_t - Set files with the ping_exec_t type, if you want to transition an executable to the ping_t domain. Paths: /bin/ping.*, /usr/bin/ping.*, /usr/sbin/fping.*, /usr/sbin/hping2, /usr/sbin/send_arp, /usr/lib/heartbeat/send_arp pingd_etc_t - Set files with the pingd_etc_t type, if you want to store pingd files in the /etc directories. pingd_exec_t - Set files with the pingd_exec_t type, if you want to transition an executable to the pingd_t domain. pingd_initrc_exec_t - Set files with the pingd_initrc_exec_t type, if you want to transition an executable to the pingd_initrc_t domain. pingd_modules_t - Set files with the pingd_modules_t type, if you want to treat the files as pingd modules. Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels. COMMANDS
semanage fcontext can also be used to manipulate default file context mappings. semanage permissive can also be used to manipulate whether or not a process type is permissive. semanage module can also be used to enable/disable/install/remove policy modules. semanage port can also be used to manipulate the port definitions semanage boolean can also be used to manipulate the booleans system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was auto-generated using sepolicy manpage . SEE ALSO
selinux(8), ping(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8) ping 14-06-10 ping_selinux(8)
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