[PATCH] Resolve denial while changing password

[PATCH] Resolve denial while changing password

[Sugar, David]

I'm seeing the following denials reading /proc/sys/crypto/fips_enabled
and sending message for logging.  This resolves those denials.

type=AVC msg=audit(1552222811.419:470): avc:  denied  { search } for  pid=7739 comm="passwd" name="crypto" dev="proc" ino=2253 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=dir permissive=1
type=AVC msg=audit(1552222811.419:470): avc:  denied  { read } for  pid=7739 comm="passwd" name="fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1
type=AVC msg=audit(1552222811.419:470): avc:  denied  { open } for  pid=7739 comm="passwd" path="/proc/sys/crypto/fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1
type=AVC msg=audit(1552222811.419:471): avc:  denied  { getattr } for  pid=7739 comm="passwd" path="/proc/sys/crypto/fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1

type=AVC msg=audit(1552222811.431:476): avc:  denied  { sendto } for  pid=7739 comm="passwd" path="/dev/log" scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=1

Signed-off-by: Dave Sugar <dsugar@tresys.com>
---
 policy/modules/admin/usermanage.te | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/policy/modules/admin/usermanage.te b/policy/modules/admin/usermanage.te
index b4f8c78c..9d17645f 100644
--- a/policy/modules/admin/usermanage.te
+++ b/policy/modules/admin/usermanage.te
@@ -304,6 +304,8 @@ allow passwd_t self:msg { send receive };
 allow passwd_t crack_db_t:dir list_dir_perms;
 read_files_pattern(passwd_t, crack_db_t, crack_db_t)
 
+kernel_dgram_send(passwd_t)
+kernel_read_crypto_sysctls(passwd_t)
 kernel_read_kernel_sysctls(passwd_t)
 
 # for SSP
-- 
2.20.1

Re: [PATCH] Resolve denial while changing password

[Chris PeBenito]

On 3/11/19 12:02 PM, Sugar, David wrote:
> I'm seeing the following denials reading /proc/sys/crypto/fips_enabled
> and sending message for logging.  This resolves those denials.
> 
> type=AVC msg=audit(1552222811.419:470): avc:  denied  { search } for  pid=7739 comm="passwd" name="crypto" dev="proc" ino=2253 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=dir permissive=1
> type=AVC msg=audit(1552222811.419:470): avc:  denied  { read } for  pid=7739 comm="passwd" name="fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1
> type=AVC msg=audit(1552222811.419:470): avc:  denied  { open } for  pid=7739 comm="passwd" path="/proc/sys/crypto/fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1
> type=AVC msg=audit(1552222811.419:471): avc:  denied  { getattr } for  pid=7739 comm="passwd" path="/proc/sys/crypto/fips_enabled" dev="proc" ino=2254 scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_crypto_t:s0 tclass=file permissive=1
> 
> type=AVC msg=audit(1552222811.431:476): avc:  denied  { sendto } for  pid=7739 comm="passwd" path="/dev/log" scontext=sysadm_u:sysadm_r:passwd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=1
> 
> Signed-off-by: Dave Sugar <dsugar@tresys.com>
> ---
>   policy/modules/admin/usermanage.te | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/policy/modules/admin/usermanage.te b/policy/modules/admin/usermanage.te
> index b4f8c78c..9d17645f 100644
> --- a/policy/modules/admin/usermanage.te
> +++ b/policy/modules/admin/usermanage.te
> @@ -304,6 +304,8 @@ allow passwd_t self:msg { send receive };
>   allow passwd_t crack_db_t:dir list_dir_perms;
>   read_files_pattern(passwd_t, crack_db_t, crack_db_t)
>   
> +kernel_dgram_send(passwd_t)
> +kernel_read_crypto_sysctls(passwd_t)
>   kernel_read_kernel_sysctls(passwd_t)
>   
>   # for SSP

Merged.  I added a comment for the /dev/log usage.

-- 
Chris PeBenito