Bug 2049300
| Summary: | SELinux is preventing /usr/bin/rpcbind from 'name_bind' accesses on the udp_socket port 65154. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Bruce Petrie <bitflip10> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED DUPLICATE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 35 | CC: | dwalsh, grepl.miroslav, lvrabec, mmalik, omosnace, pkoncity, quintela, vmojzis, zpytela |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | abrt_hash:353bb6bd6a8e04006146647683af50286d24b157900427787a028d67f4c84d5a; | ||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-02-22 10:25:43 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Similar problem has been detected: It happened during boot after 1st installation. I only use rpcbind because it is needed for nfs-server.service, nothing related to nis here. hashmarkername: setroubleshoot kernel: 5.16.9-200.fc35.x86_64 package: selinux-policy-targeted-35.15-1.fc35.noarch reason: SELinux is preventing rpcbind from 'name_bind' accesses on the udp_socket port 64585. type: libreport Has something changed in your configuration? Processes are allowed to bind to ephemeral ports when the port number matches the range for local ports as defined in the net.ipv4.ip_local_port_range kernel tunable, regardless of their SELinux label: # sysctl net.ipv4.ip_local_port_range net.ipv4.ip_local_port_range = 32768 60999 Refer to a knowledgebase article for more details (subscription required): https://access.redhat.com/solutions/3236651 (In reply to Zdenek Pytela from comment #2) > Has something changed in your configuration? Processes are allowed to bind > to ephemeral ports when the port number matches the range for local ports as > defined in the net.ipv4.ip_local_port_range kernel tunable, regardless of > their SELinux label: > > # sysctl net.ipv4.ip_local_port_range > net.ipv4.ip_local_port_range = 32768 60999 Hi again, thank you for looking into this. The SELinux errors do not occur every system boot but do occur often enough to be annoying. The system I am seeing this on is an older laptop with very boring software requirements that has been upgraded over many fedora releases (FC19 to FC35). A much faster server running security camera software, multiple network interfaces, multiple disk volumes, etc does not seems to exhibit this behavior. So is this a cockpit error on this laptop or something else... The ephemeral port number involved has varied over time. I have no need for NIS or NFS and have tried to avoid running since they expose more attack vectors. I saw this behavior occasionally on fc34 as well as now on fc35. # sysctl net.ipv4.ip_local_port_range net.ipv4.ip_local_port_range = 32768 60999 # getsebool -a|grep nis_enabled nis_enabled --> off I removed the only SELinux module that I installed to eliminate that as a possibility. I will report back after testing for a week or so unless there is anything else you would like to be tested. cheers > > Refer to a knowledgebase article for more details (subscription required): > https://access.redhat.com/solutions/3236651 (In reply to Bruce Petrie from comment #3) > Hi again, thank you for looking into this. The SELinux errors do not occur > every system boot but do occur often enough to be annoying. The system I am > seeing this on is an older laptop with very boring software requirements > that has been upgraded over many fedora releases (FC19 to FC35). A much > faster server running security camera software, multiple network interfaces, > multiple disk volumes, etc does not seems to exhibit this behavior. So is > this a cockpit error on this laptop or something else... > > The ephemeral port number involved has varied over time. I have no need for > NIS or NFS and have tried to avoid running since they expose more attack > vectors. I saw this behavior occasionally on fc34 as well as now on fc35. I don't think the range changed in past few years, but some programs may follow different standards. Can you affect the range rpcbind can bind to? > # sysctl net.ipv4.ip_local_port_range > net.ipv4.ip_local_port_range = 32768 60999 > > # getsebool -a|grep nis_enabled > nis_enabled --> off > > I removed the only SELinux module that I installed to eliminate that as a > possibility. > > I will report back after testing for a week or so unless there is anything > else you would like to be tested. If the occurence is more like random, it would probably need attention of rpcbind developers. Closing a dup of bz#1758147 to continue the discussion there. *** This bug has been marked as a duplicate of bug 1758147 *** |
Description of problem: happens during boot. rpcbind triggers numerous ports in the 65xxx rang which i believe are non priveleged ports. SELinux is preventing /usr/bin/rpcbind from 'name_bind' accesses on the udp_socket port 65154. ***** Plugin bind_ports (92.2 confidence) suggests ************************ If you want to allow /usr/bin/rpcbind to bind to network port 65154 Then you need to modify the port type. Do # semanage port -a -t PORT_TYPE -p udp 65154 where PORT_TYPE is one of the following: agentx_port_t, apertus_ldp_port_t, comsat_port_t, dhcpc_port_t, dhcpd_port_t, dns_port_t, efs_port_t, flash_port_t, ftp_port_t, gdomap_port_t, hi_reserved_port_t, inetd_child_port_t, ipmi_port_t, ipp_port_t, kerberos_admin_port_t, kerberos_port_t, kprop_port_t, ktalkd_port_t, ldap_port_t, pki_ca_port_t, pop_port_t, portmap_port_t, printer_port_t, rlogin_port_t, rlogind_port_t, rndc_port_t, router_port_t, rsh_port_t, rsync_port_t, rtsp_port_t, rwho_port_t, smtp_port_t, spamd_port_t, swat_port_t, syslogd_port_t, uucpd_port_t. ***** Plugin catchall_boolean (7.83 confidence) suggests ****************** If you want to allow system to run with NIS Then you must tell SELinux about this by enabling the 'nis_enabled' boolean. Do setsebool -P nis_enabled 1 ***** Plugin catchall (1.41 confidence) suggests ************************** If you believe that rpcbind should be allowed name_bind access on the port 65154 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 'rpcbind' --raw | audit2allow -M my-rpcbind # semodule -X 300 -i my-rpcbind.pp Additional Information: Source Context system_u:system_r:rpcbind_t:s0 Target Context system_u:object_r:unreserved_port_t:s0 Target Objects port 65154 [ udp_socket ] Source rpcbind Source Path /usr/bin/rpcbind Port 65154 Host (removed) Source RPM Packages rpcbind-1.2.6-1.fc35.x86_64 Target RPM Packages SELinux Policy RPM selinux-policy-targeted-35.11-1.fc35.noarch Local Policy RPM selinux-policy-targeted-35.11-1.fc35.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 5.15.18-200.fc35.x86_64 #1 SMP Sat Jan 29 13:54:17 UTC 2022 x86_64 x86_64 Alert Count 1 First Seen 2022-02-01 14:13:38 MST Last Seen 2022-02-01 14:13:38 MST Local ID 0a7ed6fc-12cb-416e-8041-a888a21c10d8 Raw Audit Messages type=AVC msg=audit(1643750018.399:125): avc: denied { name_bind } for pid=827 comm="rpcbind" src=65154 scontext=system_u:system_r:rpcbind_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=udp_socket permissive=0 type=SYSCALL msg=audit(1643750018.399:125): arch=x86_64 syscall=bind success=no exit=EACCES a0=b a1=7ffcde9642a0 a2=1c a3=7ffcde9641a8 items=0 ppid=1 pid=827 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=rpcbind exe=/usr/bin/rpcbind subj=system_u:system_r:rpcbind_t:s0 key=(null) Hash: rpcbind,rpcbind_t,unreserved_port_t,udp_socket,name_bind Version-Release number of selected component: selinux-policy-targeted-35.11-1.fc35.noarch Additional info: component: selinux-policy reporter: libreport-2.15.2 hashmarkername: setroubleshoot kernel: 5.15.18-200.fc35.x86_64 type: libreport Potential duplicate: bug 1563792