Package: selinux-policy-default
Version: 2:0.0.20080702-6
Severity: important

Postfix doesn't work with SELinux in Enforce mode. It's impossible to send
an email or check mailq :

For mail command :

srv2-reverse-pxy-c59p:~# echo "test" | mail -s "test" myem...@mydomain.fr
send-mail: fatal: execvp /usr/sbin/postdrop: Permission denied
send-mail: warning: command "/usr/sbin/postdrop -r" exited with status 1
send-mail: fatal: root(0): unable to execute /usr/sbin/postdrop -r: Success
Can't send mail: sendmail process failed with error code 75
srv2-reverse-pxy-c59p:~#

syslog :

Oct  4 07:59:30 srv2-reverse-pxy-c59p send-mail[7745]: fatal: execvp
/usr/sbin/postdrop: Permission denied
Oct  4 07:59:30 srv2-reverse-pxy-c59p kernel: [518194.655281] type=1401
audit(1286171970.993:46): security_compute_sid:  invalid context
unconfined_u:unconfined_r:postfix_postdrop_t:s0 for
scontext=unconfined_u:unconfined_r:unconfined_mail_t:s0
tcontext=system_u:object_r:postfix_postdrop_exec_t:s0 tclass=process
Oct  4 07:59:31 srv2-reverse-pxy-c59p postfix/sendmail[7744]: warning:
command "/usr/sbin/postdrop -r" exited with status 1
Oct  4 07:59:31 srv2-reverse-pxy-c59p postfix/sendmail[7744]: fatal:
root(0): unable to execute /usr/sbin/postdrop -r: Success


dmesg :

[518194.655281] type=1401 audit(1286171970.993:46): security_compute_sid: 
invalid context unconfined_u:unconfined_r:postfix_postdrop_t:s0 for
scontext=unconfined_u:unconfined_r:unconfined_mail_t:s0
tcontext=system_u:object_r:postfix_postdrop_exec_t:s0 tclass=process



For mailq command :

srv2-reverse-pxy-c59p:~# mailq
mailq: fatal: execv /usr/sbin/postqueue: Permission denied
srv2-reverse-pxy-c59p:~#

syslog :

Oct  4 08:11:26 srv2-reverse-pxy-c59p postfix/sendmail[7759]: fatal: execv
/usr/sbin/postqueue: Permission denied
Oct  4 08:11:26 srv2-reverse-pxy-c59p kernel: [518913.529188] type=1401
audit(1286172686.605:47): security_compute_sid:  invalid context
unconfined_u:unconfined_r:postfix_postqueue_t:s0 for
scontext=unconfined_u:unconfined_r:unconfined_mail_t:s0
tcontext=system_u:object_r:postfix_postqueue_exec_t:s0 tclass=process

dmesg :

[518913.529188] type=1401 audit(1286172686.605:47): security_compute_sid: 
invalid context unconfined_u:unconfined_r:postfix_postqueue_t:s0 for
scontext=unconfined_u:unconfined_r:unconfined_mail_t:s0
tcontext=system_u:object_r:postfix_postqueue_exec_t:s0 tclass=process



Others informations :

srv2-reverse-pxy-c59p:~# getenforce
Enforcing
srv2-reverse-pxy-c59p:~# id
uid=0(root) gid=0(root)
groupes=0(root),1(daemon),2(bin),3(sys),4(adm),6(disk)
context=unconfined_u:unconfined_r:unconfined_t:s0
srv2-reverse-pxy-c59p:~# ls -Z /usr/sbin/postdrop
system_u:object_r:postfix_postdrop_exec_t:s0 /usr/sbin/postdrop
srv2-reverse-pxy-c59p:~# ls -Z /usr/sbin/sendmail
system_u:object_r:sendmail_exec_t:s0 /usr/sbin/sendmail
srv2-reverse-pxy-c59p:~# ls -Z /usr/bin/mail
system_u:object_r:bin_t:s0 /usr/bin/mail
srv2-reverse-pxy-c59p:~# ls -Z /usr/sbin/postqueue
system_u:object_r:postfix_postqueue_exec_t:s0 /usr/sbin/postqueue
srv2-reverse-pxy-c59p:~#



srv2-reverse-pxy-c59p:~# dpkg -l | grep selinux
ii  libselinux1                         2.0.65-5                 SELinux
shared libraries
ii  python-selinux                      2.0.65-5                 Python
bindings to SELinux shared libraries
ii  selinux-basics                      0.3.5                    SELinux
basic support
ii  selinux-policy-default              2:0.0.20080702-6         Strict
and Targeted variants of the SELinux
ii  selinux-utils                       2.0.65-5                 SELinux
utility programs

Thanks,

AUrelien PROVIN




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