Bug 1532001
| Summary: | SELinux is preventing /usr/sbin/unix_chkpwd from using the dac_read_search capability | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | srakitnican <samuel.rakitnican> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED NEXTRELEASE | QA Contact: | BaseOS QE Security Team <qe-baseos-security> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.4 | CC: | lvrabec, mgrepl, mmalik, plautrba, ssekidde |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-01-08 09:31:16 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Hello, This will be fixed in next minor release. Thanks, Lukas. As soon as RHEL-7.5 becomes GA. |
SELinux is preventing /usr/sbin/unix_chkpwd from using the dac_read_search capability. ***** Plugin dac_override (91.4 confidence) suggests ********************** If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system Then turn on full auditing to get path information about the offending file and generate the error again. Do Turn on full auditing # auditctl -w /etc/shadow -p w Try to recreate AVC. Then execute # ausearch -m avc -ts recent If you see PATH record check ownership/permissions on file, and fix it, If you see PATH record check ownership/permissions on file, and fix it, otherwise report as a bugzilla. ***** Plugin catchall (9.59 confidence) suggests ************************** If you believe that unix_chkpwd should have the dac_read_search capability 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 'unix_chkpwd' --raw | audit2allow -M my-unixchkpwd # semodule -i my-unixchkpwd.pp Additional Information: Source Context system_u:system_r:chkpwd_t:s0-s0:c0.c1023 Target Context system_u:system_r:chkpwd_t:s0-s0:c0.c1023 Target Objects /etc/shadow [ capability ] Source unix_chkpwd Source Path /usr/sbin/unix_chkpwd Port <Unknown> Host crnigrom Source RPM Packages pam-1.1.8-18.el7.x86_64 Target RPM Packages setup-2.8.71-7.el7.noarch Policy RPM selinux-policy-3.13.1-166.el7_4.7.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name crnigrom Platform Linux crnigrom 4.14.6-1.el7.elrepo.x86_64 #1 SMP Thu Dec 14 09:52:47 EST 2017 x86_64 x86_64 Alert Count 19969 First Seen 2017-10-27 19:40:01 CEST Last Seen 2018-01-07 11:20:01 CET Local ID 33366ddd-db20-4ede-a585-034516071bad Raw Audit Messages type=AVC msg=audit(1515320401.605:105916): avc: denied { dac_read_search } for pid=1681 comm="unix_chkpwd" capability=2 scontext=system_ u:system_r:chkpwd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:chkpwd_t:s0-s0:c0.c1023 tclass=capability permissive=0 type=SYSCALL msg=audit(1515320401.605:105916): arch=x86_64 syscall=open success=yes exit=ESRCH a0=7ff57a28c453 a1=80000 a2=1b6 a3=24 items=1 ppid=1680 pid=1681 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=unix_chkpwd exe=/ usr/sbin/unix_chkpwd subj=system_u:system_r:chkpwd_t:s0-s0:c0.c1023 key=(null) type=CWD msg=audit(1515320401.605:105916): cwd=/ type=PATH msg=audit(1515320401.605:105916): item=0 name=/etc/shadow inode=2097668 dev=08:02 mode=0100000 ouid=0 ogid=0 rdev=00:00 obj=system _u:object_r:shadow_t:s0 nametype=NORMAL cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0 Hash: unix_chkpwd,chkpwd_t,chkpwd_t,capability,dac_read_search