why is proftpd trying to open lots of random udp sockets? Is this a normal behavior?
the audit log is flooded with these messages.
Enabled these:
setsebool -P ftpd_connect_all_unreserved 1
setsebool -P ftpd_use_passive_mode=1
setsebool -P ftpd_full_access=1
Apart from that, everything seems to be working normally. No config errors, etc.
SELinux is preventing /usr/sbin/proftpd from name_bind access on the udp_socket port 27938.
***** Plugin catchall_boolean (89.3 confidence) suggests ******************
If you want to allow nis to enabled
Then you must tell SELinux about this by enabling the 'nis_enabled' boolean.
Do
setsebool -P nis_enabled 1
***** Plugin catchall (11.6 confidence) suggests **************************
If you believe that proftpd should be allowed name_bind access on the port 27938 udp_socket by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'proftpd' --raw | audit2allow -M my-proftpd
# semodule -X 300 -i my-proftpd.pp
Additional Information:
Source Context system_u:system_r:ftpd_t:s0-s0:c0.c1023
Target Context system_u:object_r:unreserved_port_t:s0
Target Objects port 27938 [ udp_socket ]
Source proftpd
Source Path /usr/sbin/proftpd
Port 27938
Host <Unknown>
Source RPM Packages proftpd-1.3.6e-4.el8.x86_64
Target RPM Packages
SELinux Policy RPM selinux-policy-targeted-3.14.3-67.el8_4.2.noarch
Local Policy RPM selinux-policy-targeted-3.14.3-67.el8_4.2.noarch
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name ftphostname
Platform Linux ftphostname 4.18.0-305.19.1.el8_4.x86_64
#1 SMP Wed Sep 15 11:28:53 EDT 2021 x86_64 x86_64
Alert Count 14
First Seen 2021-10-01 14:44:19 CEST
Last Seen 2021-10-01 14:44:19 CEST
Local ID d1a84414-7ba1-4756-a6b7-c1c399deacf1
Raw Audit Messages
type=AVC msg=audit(1633092259.49:1972228): avc: denied { name_bind } for pid=49365 comm="proftpd" src=27938 scontext=system_u:system_r:ftpd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=udp_socket permissive=0
type=SYSCALL msg=audit(1633092259.49:1972228): arch=x86_64 syscall=bind success=no exit=EACCES a0=11 a1=7f9b666cbcd0 a2=10 a3=fffffffffffffaf4 items=0 ppid=48153 pid=49365 auid=4294967295 uid=0 gid=65534 euid=65534 suid=0 fsuid=65534 egid=65534 sgid=65534 fsgid=65534 tty=(none) ses=4294967295 comm=proftpd exe=/usr/sbin/proftpd subj=system_u:system_r:ftpd_t:s0-s0:c0.c1023 key=(null)ARCH=x86_64 SYSCALL=bind AUID=unset UID=root GID=nobody EUID=nobody SUID=root FSUID=nobody EGID=nobody SGID=nobody FSGID=nobody
Hash: proftpd,ftpd_t,unreserved_port_t,udp_socket,name_bind
