sshd key context
m.roth at 5-cent.us
m.roth at 5-cent.us
Tue Jan 8 22:28:38 UTC 2013
Daniel J Walsh wrote:
> On 01/08/2013 05:12 PM, m.roth at 5-cent.us wrote:
>> Daniel J Walsh wrote:
>>> On 01/08/2013 05:04 PM, m.roth at 5-cent.us wrote:
>>>> Daniel J Walsh wrote:
>>>>> On 01/08/2013 01:57 PM, m.roth at 5-cent.us wrote:
>>>>>> Is this a bug? It's certainly a real inconsistancy, IMO.
>>>>>>
>>>>>> I just built a user's workstation, new, as fc-17.
>>>>>>
>>>>>> ll -Z /usr/sbin/sshd -rwxr-xr-x. root root
>>>>>> system_u:object_r:sshd_exec_t:s0 /usr/sbin/sshd*
>>>>>>
>>>>>> ll -Z /etc/ssh/ drwxr-xr-x. root root system_u:object_r:etc_t:s0
>>>>>> ./ drwxr-xr-x. root root system_u:object_r:etc_t:s0 ../
>>>>>> -rw-------. root root system_u:object_r:etc_t:s0 moduli
>>>>>> -rw-r--r--. root root system_u:system_u:etc_t:s0 ssh_config
>>>>>> -rw-------. root root system_u:system_u:etc_t:s0 sshd_config
>>>>>> -rw-------. root root system_u:system_u:etc_t:s0
>>>>>> sshd_config.rpmnew -rw-------. root root
>>>>>> system_u:system_u:sshd_key_t:s0 ssh_host_dsa_key -rw-r--r--. root
>>>>>> root system_u:system_u:sshd_key_t:s0 ssh_host_dsa_key.pub
>>>>>> -rw-------. root root system_u:system_u:sshd_key_t:s0 ssh_host_key
>>>>>> -rw-r--r--. root root system_u:system_u:sshd_key_t:s0
>>>>>> ssh_host_key.pub -rw-------. root root
>>>>>> system_u:system_u:sshd_key_t:s0 ssh_host_rsa_key -rw-r--r--. root
>>>>>> root system_u:system_u:sshd_key_t:s0 ssh_host_rsa_key.pub
>>>>>> -rw-r--r--. root root system_u:system_u:etc_t:s0
>>>>>> ssh_known_hosts
>>>>>>
>>>>>> sealert tells me that the ssh_host_*_key should be etc_t, not, as
>>>>>> I set it, sshd_key_t.
>>>>>>
>>>>> What does matchpathcon /etc/ssh/ssh_host*
>>>>>
>>>>> Say?
>>>> <snip> matchpathcon /etc/ssh/ssh_host* /etc/ssh/ssh_host_dsa_key
>>>> system_u:object_r:sshd_key_t:s0 /etc/ssh/ssh_host_dsa_key.pub
>>>> system_u:object_r:sshd_key_t:s0 /etc/ssh/ssh_host_key
>>>> system_u:object_r:sshd_key_t:s0 /etc/ssh/ssh_host_key.pub
>>>> system_u:object_r:sshd_key_t:s0 /etc/ssh/ssh_host_rsa_key
>>>> system_u:object_r:sshd_key_t:s0 /etc/ssh/ssh_host_rsa_key.pub
>>>> system_u:object_r:sshd_key_t:s0
>>>>
>>> can you attach the sealert message?
>>
>> SELinux is preventing /usr/sbin/sshd from getattr access on the file
>> /etc/ssh/ss h_host_rsa_key.
>>
>> ***** Plugin restorecon (94.8 confidence) suggests
>> *************************
>>
>> If you want to fix the label. /etc/ssh/ssh_host_rsa_key default label
>> should be etc_t. Then you can run restorecon. Do # /sbin/restorecon -v
>> /etc/ssh/ssh_host_rsa_key
>>
>> ***** Plugin catchall_labels (5.21 confidence) suggests
>> ********************
>>
>> If you want to allow sshd to have getattr access on the ssh_host_rsa_key
>> file Then you need to change the label on /etc/ssh/ssh_host_rsa_key Do #
>> semanage fcontext -a -t FILE_TYPE '/etc/ssh/ssh_host_rsa_key' where
>> FILE_TYPE is one of the following: oddjob_mkhomedir_exec_t,
>> rpm_script_tmp
>> _t, dbusd_etc_t, systemd_systemctl_exec_t, sshd_exec_t,
>> fusermount_exec_t,
>> secur ity_t, ld_so_cache_t, faillog_t, abrt_var_cache_t, pam_exec_t,
>> lastlog_t, passwd _file_t, nx_server_home_ssh_t, proc_net_t,
>> sosreport_tmp_t, machineid_t, rssh_ro _t, cfengine_var_log_t,
>> proc_afs_t,
>> krb5_conf_t, chkpwd_exec_t, rpm_tmp_t, etc_r untime_t, condor_var_lib_t,
>> updpwd_exec_t, openct_var_run_t, abrt_var_run_t, user_home_type,
>> configfile, initrc_var_run_t, domain, initrc_tmp_t, pcscd_var_run_t ,
>> samba_etc_t, sshd_var_run_t, user_cron_spool_t, pam_var_run_t,
>> shutdown_exec_t , ssh_home_t, exec_type, sysctl_crypto_t, user_tmp_type,
>> systemd_logind_var_run_ t, sysctl_kernel_t, samba_var_t,
>> mount_ecryptfs_exec_t, local_login_home_t, syst em_dbusd_var_lib_t,
>> samba_etc_t, systemd_logind_sessions_t, net_conf_t, user_tmp _t,
>> selinux_config_t, logfile, gitosis_var_lib_t, sshd_tmpfs_t,
>> openshift_tmp_t, default_context_t, mail_spool_t, rlogind_home_t,
>> locale_t, nx_server_exec_t, va r_auth_t, cgroup_t, etc_t, ld_so_t,
>> abrt_t,
>> bin_t, proc_t, cert_t, sysfs_t, init _t, lib_t, user_home_t,
>> krb5_keytab_t,
>> sshd_t, usr_t, wtmp_t, cpu_online_t, abrt _helper_exec_t, user_tmp_t,
>> login_exec_t, auth_home_t, sshd_keytab_t, xauth_exec _t, auth_cache_t,
>> tmpfile, etc_t, selinux_login_config_t, ecryptfs_t, cert_t, pu
>> ppet_tmp_t,
>> screen_exec_t, fail2ban_var_lib_t, mount_exec_t, shell_exec_t, ssh_a
>> gent_exec_t, textrel_shlib_t, krb5_home_t, passwd_exec_t, crack_db_t,
>> rssh_exec_ t, ssh_home_t, sshd_key_t, krb5_conf_t, sssd_public_t,
>> security_t, file_context_ t, root_t, krb5_host_rcache_t, nfs_t,
>> krb5_host_rcache_t, shell_exec_t. Then execute: restorecon -v
>> '/etc/ssh/ssh_host_rsa_key'
>>
>>
>> ***** Plugin catchall (1.44 confidence) suggests
>> ***************************
>>
>> If you believe that sshd should be allowed getattr access on the
>> ssh_host_rsa_ke y 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: # grep sshd /var/log/audit/audit.log |
>> audit2allow -M mypol # semodule -i mypol.pp
>>
>>
>> Additional Information: Source Context
>> system_u:system_r:sshd_t:s0-s0:c0.c1023 Target Context
>> system_u:object_r:unlabeled_t:s0 Target Objects
>> /etc/ssh/ssh_host_rsa_key [ file ] Source sshd
>> Source Path /usr/sbin/sshd Port
>> <Unknown> Host example.com Source RPM Packages
>> openssh-server-5.9p1-28.fc17.x86_64 Target RPM Packages Policy RPM
>> selinux-policy-3.10.0-166.fc17.noarch Selinux Enabled True
>> Policy Type targeted Enforcing Mode
>> Permissive Host Name example.com Platform
>> Linux example.com 3.6.11-1.fc17.x86_64 #1 SMP Mon Dec 17 22:16:35 UTC
>> 2012
>> x86_64 x86_64 Alert Count 22 First Seen
>> 2013-01-07 17:19:53 EST Last Seen 2013-01-08
>> 12:46:46
>> EST Local ID 99e7ca06-e6f8-4fe2-9440-13c11c062525
>>
>> Raw Audit Messages type=AVC msg=audit(1357667206.325:709): avc: denied
>> {
>> getattr } for pid=3470 comm="sshd" path="/etc/ssh/ssh_host_rsa_key"
>> dev="sda3" ino=11372820 scontext=sy
>> stem_u:system_r:sshd_t:s0-s0:c0.c1023
>> tcontext=system_u:object_r:unlabeled_t:s0 tclass=file
>>
>> type=SYSCALL msg=audit(1357667206.325:709): arch=x86_64 syscall=fstat
>> success=ye s exit=0 a0=3 a1=7fff34871680 a2=7fff34871680 a3=10 items=0
>> ppid=862 pid=3470 au id=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
>> egid=0
>> sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=sshd exe=/usr/sbin/sshd
>> subj=system_u:system_r:sshd_t:s0-s0 :c0.c1023 key=(null) Hash:
>> sshd,sshd_t,unlabeled_t,file,getattr
>>
>> audit2allow
>>
>> #============= sshd_t ============== allow sshd_t unlabeled_t:file
>> getattr;
>>
>> audit2allow -R
>>
>> #============= sshd_t ============== allow sshd_t unlabeled_t:file
>> getattr;
>>
>>
>> -- selinux mailing list selinux at lists.fedoraproject.org
>> https://admin.fedoraproject.org/mailman/listinfo/selinux
>>
>
> Well it was correct about relabeling the file to something other then
> unlabeled_t, but the alert saying it should be etc_t is broken.
>
Ok, so what's my best way to shut the sealert up: a local policy, or wait
for a fixed policy?
mark
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