11.3. 문제 해결

소개

~]$ ls -l /var/www/html/index.html
-rw-r----- 1 root root 0 2009-05-07 11:06 index.html

~]# chown apache:apache /var/www/html/index.html
~]# semodule -DB
~]# semodule -B
~]$ sesearch --dontaudit -s smbd_t | grep squid
dontaudit smbd_t squid_port_t : tcp_socket name_bind ;
dontaudit smbd_t squid_port_t : udp_socket name_bind ;
~]# semanage permissive -a httpd_t
~]# semodule -l | grep permissive
permissive_httpd_t    (null)
permissivedomains     (null)

~]# semanage permissive -d httpd_t
~]# semodule -d permissivedomains
~]# semodule --list-modules=full
type=AVC msg=audit(1226882736.442:86): avc:  denied  { getattr } for  pid=2427 comm="httpd" path="/var/www/html/file1" dev=dm-0 ino=284133 scontext=unconfined_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:samba_share_t:s0 tclass=file

type=SYSCALL msg=audit(1226882736.442:86): arch=40000003 syscall=196 success=no exit=-13 a0=b9a1e198 a1=bfc2921c a2=54dff4 a3=2008171 items=0 ppid=2425 pid=2427 auid=502 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4 comm="httpd" exe="/usr/sbin/httpd" subj=unconfined_u:system_r:httpd_t:s0 key=(null)

type=AVC msg=audit(1226882925.714:136): avc:  denied  { read } for  pid=2512 comm="httpd" name="file1" dev=dm-0 ino=284133 scontext=unconfined_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:samba_share_t:s0 tclass=file

type=SYSCALL msg=audit(1226882925.714:136): arch=40000003 syscall=5 success=yes exit=11 a0=b962a1e8 a1=8000 a2=0 a3=8000 items=0 ppid=2511 pid=2512 auid=502 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4 comm="httpd" exe="/usr/sbin/httpd" subj=unconfined_u:system_r:httpd_t:s0 key=(null)

~]# ausearch -m avc -c httpd
~]# ausearch -m avc -c smbd
~]# aureport -a

AVC Report
========================================================
# date time comm subj syscall class permission obj event
========================================================
1. 05/01/2009 21:41:39 httpd unconfined_u:system_r:httpd_t:s0 195 file getattr system_u:object_r:samba_share_t:s0 denied 2
2. 05/03/2009 22:00:25 vsftpd unconfined_u:system_r:ftpd_t:s0 5 file read unconfined_u:object_r:cifs_t:s0 denied 4

setroubleshoot: SELinux is preventing /usr/sbin/httpd from name_bind access on the tcp_socket. For complete SELinux messages. run sealert -l 8c123656-5dda-4e5d-8791-9e3bd03786b7

type=AVC msg=audit(1226874073.147:96): avc:  denied  { getattr } for  pid=2465 comm="httpd" path="/var/www/html/file1" dev=dm-0 ino=284133 scontext=unconfined_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:samba_share_t:s0 tclass=file

type=SYSCALL msg=audit(1226874073.147:96): arch=40000003 syscall=196 success=no exit=-13 a0=b98df198 a1=bfec85dc a2=54dff4 a3=2008171 items=0 ppid=2463 pid=2465 auid=502 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=6 comm="httpd" exe="/usr/sbin/httpd" subj=unconfined_u:system_r:httpd_t:s0 key=(null)

hostname setroubleshoot: SELinux is preventing httpd (httpd_t) "getattr" to /var/www/html/file1 (samba_share_t). For complete SELinux messages. run sealert -l 32eee32b-21ca-4846-a22f-0ba050206786

~]$ sealert -l 32eee32b-21ca-4846-a22f-0ba050206786
SELinux is preventing httpd from getattr access on the file /var/www/html/file1.

*****  Plugin restorecon (92.2 confidence) suggests   ************************

If you want to fix the label. 
/var/www/html/file1 default label should be httpd_sys_content_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /var/www/html/file1

*****  Plugin public_content (7.83 confidence) suggests   ********************

If you want to treat file1 as public content
Then you need to change the label on file1 to public_content_t or public_content_rw_t.
Do
# semanage fcontext -a -t public_content_t '/var/www/html/file1'
# restorecon -v '/var/www/html/file1'

*****  Plugin catchall (1.41 confidence) suggests   **************************

If you believe that httpd should be allowed getattr access on the file1 file 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 'httpd' --raw | audit2allow -M my-httpd
# semodule -i my-httpd.pp

Additional Information:
Source Context                system_u:system_r:httpd_t:s0
Target Context                unconfined_u:object_r:samba_share_t:s0
Target Objects                /var/www/html/file1 [ file ]
Source                        httpd
Source Path                   httpd
Port                          <Unknown>
Host                          hostname.redhat.com
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-166.el7.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     hostname.redhat.com
Platform                      Linux hostname.redhat.com
                              3.10.0-693.el7.x86_64 #1 SMP Thu Jul 6 19:56:57
                              EDT 2017 x86_64 x86_64
Alert Count                   2
First Seen                    2017-07-20 02:52:11 EDT
Last Seen                     2017-07-20 02:52:11 EDT
Local ID                      32eee32b-21ca-4846-a22f-0ba050206786

Raw Audit Messages
type=AVC msg=audit(1500533531.140:295): avc:  denied  { getattr } for  pid=24934 comm="httpd" path="/var/www/html/file1" dev="vda1" ino=31457414 scontext=system_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:samba_share_t:s0 tclass=file

Hash: httpd,httpd_t,samba_share_t,file,getattr
type=AVC msg=audit(1226270358.848:238): avc:  denied  { write } for  pid=13349 comm="certwatch" name="cache" dev=dm-0 ino=218171 scontext=system_u:system_r:certwatch_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=dir

type=SYSCALL msg=audit(1226270358.848:238): arch=40000003 syscall=39 success=no exit=-13 a0=39a2bf a1=3ff a2=3a0354 a3=94703c8 items=0 ppid=13344 pid=13349 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="certwatch" exe="/usr/bin/certwatch" subj=system_u:system_r:certwatch_t:s0 key=(null)

~]# audit2allow -w -a
type=AVC msg=audit(1226270358.848:238): avc:  denied  { write } for  pid=13349 comm="certwatch" name="cache" dev=dm-0 ino=218171 scontext=system_u:system_r:certwatch_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=dir
	Was caused by:
		Missing type enforcement (TE) allow rule.

	You can use audit2allow to generate a loadable module to allow this access.

~]# audit2allow -a

#============= certwatch_t ==============
allow certwatch_t var_t:dir write;

~]# audit2allow -a -M mycertwatch
******************** IMPORTANT ***********************
To make this policy package active, execute:

semodule -i mycertwatch.pp

~]# ls
mycertwatch.pp  mycertwatch.te

~]# semodule -i mycertwatch.pp
~]# grep certwatch /var/log/audit/audit.log | audit2allow -R -M mycertwatch2
******************** IMPORTANT ***********************
To make this policy package active, execute:

semodule -i mycertwatch2.pp

11.3. 문제 해결

11.3.1. Linux 권한

11.3.2. 음소거 거부의 원인

11.3.3. 서비스 수동 페이지

11.3.4. 허용 도메인

11.3.4.1. 도메인 허용 만들기

11.3.4.2. 허용 도메인 비활성화

11.3.4.3. 허용 도메인에 대한 거부

11.3.5. 거부 검색 및 보기

ausearch

aureport

sealert

11.3.6. 원시 감사 메시지

11.3.7. sealert 메시지

11.3.8. 액세스 허용: audit2allow

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