snmpd_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 7 versions
, in opensuse-leap 16.0

🎀 snmpd_selinux — the SELinux policy page for ol' snmpd 💅

okay so this is snmpd_selinux(8), straight out of the SELinux Policy snmpd fam. it's the manual page that explains how SELinux locks down your snmpd processes, and honestly? it's giving security girlboss energy. let's get into it bestie 🔥

✨ NAME ✨

snmpd_selinux — the Security Enhanced Linux Policy for the snmpd processes. yes that's it, that's the whole name section, she's concise 👑

🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the snmpd processes via flexible mandatory access control. mandatory, bestie — not vibes-based, mandatory. 💀

The snmpd processes execute with the snmpd_t SELinux type. wanna check if you've got these processes running? run the ps command with the -Z qualifier, easy peasy:

ps -eZ | grep snmpd_t

that's the whole vibe check right there 🫶

🌸 ENTRYPOINTS 🌸

so the snmpd_t SELinux type can be entered via the snmpd_exec_t file type. that's the door, basically 🚪✨

The default entrypoint paths for the snmpd_t domain are the following:

/usr/bin/snmpd, /usr/bin/snmptrapd

those two. iconic behavior, no notes.

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. one domain per process, very organized of her 💖

You can see the context of a process using the -Z option to ps.

Policy governs the access confined processes have to files. SELinux snmpd policy is very flexible allowing users to setup their snmpd processes in as secure a method as possible. flexible AND secure, she contains multitudes 🌈

The following process types are defined for snmpd:

snmpd_t
Note: semanage permissive -a snmpd_t can be used to make the process type snmpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, she stops blocking you but she's still watching and taking notes 📝👀

💜 BOOLEANS 💜

SELinux policy is customizable based on least access required — like, only give the bare minimum, boundaries are self care 🧚 snmpd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run snmpd with the tightest access possible. tightest access possible, periodt.

If you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on the daemons_dontaudit_scheduling boolean. Enabled by default.

setsebool -P daemons_dontaudit_scheduling 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 allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.

setsebool -P nis_enabled 1

🌟 PORT TYPES 🌟

SELinux defines port types to represent TCP and UDP ports. yes, ports get types too, everyone gets a label in this household 🎀

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 snmpd policy is very flexible allowing users to setup their snmpd processes in as secure a method as possible. (yes she said it again, she's consistent 💅)

The following port types are defined for snmpd:

snmp_port_t

Default Defined Ports:

tcp 199,1161,161-162,10161-10162
udp 161-162,10161-10162

look at all those numbers, she's numerically booked and busy 🔥

🍓 MANAGED FILES 🍓

The SELinux process type snmpd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions. SELinux said yes, but DAC still gets a say — two gates, bestie 🚪🚪

cluster_conf_t

/etc/cluster(/.*)?

cluster_var_lib_t

/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?

cluster_var_run_t

/run/crm(/.*)?
/run/cman_.*
/run/rsctmp(/.*)?
/run/aisexec.*
/run/heartbeat(/.*)?
/run/pcsd-ruby.socket
/run/corosync-qnetd(/.*)?
/run/corosync-qdevice(/.*)?
/run/pcsd.socket
/run/corosync.pid
/run/cpglockd.pid
/run/rgmanager.pid
/run/cluster/rgmanager.sk

krb5_host_rcache_t

/var/tmp/krb5_0.rcache2
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0

root_t

/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp

snmpd_log_t

/var/log/snmpd.log.*

snmpd_var_lib_t

/var/agentx(/.*)?
/var/net-snmp(/.*)
/var/lib/snmp(/.*)?
/var/net-snmp(/.*)?
/var/lib/net-snmp(/.*)?
/var/spool/snmptt(/.*)?
/usr/share/snmp/mibs/.index

snmpd_var_run_t

/run/snmpd(/.*)?
/run/net-snmp(/.*)?
/run/snmpd.pid

💖 FILE CONTEXTS 💖

SELinux requires files to have an extended attribute to define the file type. every file needs its little label, like a name tag at a party 🏷️✨

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 snmpd policy is very flexible allowing users to setup their snmpd processes in as secure a method as possible. (she really said it three times, she's committed 💀)

🌼 STANDARD FILE CONTEXT 🌼

SELinux defines the file context types for the snmpd, if you wanted to store files with these types in a different paths, you need to execute the semanage command to specify alternate labeling and then use restorecon to put the labels on disk.

semanage fcontext -a -t snmpd_exec_t '/srv/snmpd/content(/.*)?'
restorecon -R -v /srv/mysnmpd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🧚‍♀️

The following file types are defined for snmpd:

snmpd_exec_t

  • Set files with the snmpd_exec_t type, if you want to transition an executable to the snmpd_t domain.

Paths:

/usr/bin/snmpd, /usr/bin/snmptrapd

snmpd_initrc_exec_t

  • Set files with the snmpd_initrc_exec_t type, if you want to transition an executable to the snmpd_initrc_t domain.

snmpd_log_t

  • Set files with the snmpd_log_t type, if you want to treat the data as snmpd log data, usually stored under the /var/log directory.

snmpd_var_lib_t

  • Set files with the snmpd_var_lib_t type, if you want to store the snmpd files under the /var/lib directory.

Paths:

/var/agentx(/.*)?, /var/net-snmp(/.*), /var/lib/snmp(/.*)?,
/var/net-snmp(/.*)?, /var/lib/net-snmp(/.*)?,
/var/spool/snmptt(/.*)?, /usr/share/snmp/mibs/.index

snmpd_var_run_t

  • Set files with the snmpd_var_run_t type, if you want to store the snmpd files under the /run or /var/run directory.

Paths:

/run/snmpd(/.*)?, /run/net-snmp(/.*)?, /run/snmpd.pid
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. temporary chcon = a story highlight, semanage fcontext + restorecon = the actual grid post 📸

⭐ COMMANDS ⭐

here's the toolbox bestie, all the little semanage siblings doing their thing:

  • 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. GUI girlies, this one's for you 🖥️💅

🫶 AUTHOR 🫶

This manual page was auto-generated using sepolicy manpage. no human wrote this, a machine did, and honestly? she ate 🤖✨

🌈 SEE ALSO 🌈

selinux(8), snmpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

go read those too, iykyk 📚💜

aaand that's the page, bestie! this was snmpd from 26-10-06, living in snmpd_selinux(8) land. mwah, stay labeled, stay confined 💋🎀🦋

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