Network problem on second IP (not default route)

Discuss usability issues, general maintenance, and general support issues for a grsecurity-enabled system.

Moderators: spender, PaX Team

Network problem on second IP (not default route)

Postby cdrcnm » Wed Aug 05, 2015 4:05 am

Hello,

I have a VM (on XenServer) with Haproxy 1.5 and I try to make it work with a Linux kernel 3.14.48 with the Grsecurity patch ( grsecurity-3.1-3.14.48-201508020901.patch) compiled myself.

The VM have 3 network interfaces :
eth0 for the LAN
eth1 for the WAN > the default route
eth2 for a second IP on WAN

Haproxy don't respond on the requests made on eth2.

If I switch config and use eth2 as default route, the request made on eth2 works, but not the request on eth1

Haproxy doesn't show any errors on start and listen on the interface (verified with netstat), but I can't see the paquets arriving in debug mode.
Socat also listen on the interface, but do not receive packets.

The firewall is open, and I see the packets reaching the VM with tcdump on eth2 interface.

I tested with the same kernel version and compilation options without Grsec, and no other changes on the server and it works fine. The problem came from the grsecurity patch.
PaX run in softmode.

It seems that grsecurity block reponse not from default route. How to fix my problem ?


Compilation options:

Code: Select all
#
# Grsecurity
#
CONFIG_TASK_SIZE_MAX_SHIFT=47
CONFIG_PAX_USERCOPY_SLABS=y
CONFIG_GRKERNSEC=y
CONFIG_GRKERNSEC_CONFIG_AUTO=y
# CONFIG_GRKERNSEC_CONFIG_CUSTOM is not set
CONFIG_GRKERNSEC_CONFIG_SERVER=y
# CONFIG_GRKERNSEC_CONFIG_DESKTOP is not set
# CONFIG_GRKERNSEC_CONFIG_VIRT_NONE is not set
CONFIG_GRKERNSEC_CONFIG_VIRT_GUEST=y
# CONFIG_GRKERNSEC_CONFIG_VIRT_HOST is not set
CONFIG_GRKERNSEC_CONFIG_VIRT_EPT=y
# CONFIG_GRKERNSEC_CONFIG_VIRT_SOFT is not set
CONFIG_GRKERNSEC_CONFIG_VIRT_XEN=y
# CONFIG_GRKERNSEC_CONFIG_VIRT_VMWARE is not set
# CONFIG_GRKERNSEC_CONFIG_VIRT_KVM is not set
# CONFIG_GRKERNSEC_CONFIG_VIRT_VIRTUALBOX is not set
# CONFIG_GRKERNSEC_CONFIG_VIRT_HYPERV is not set
# CONFIG_GRKERNSEC_CONFIG_PRIORITY_PERF is not set
CONFIG_GRKERNSEC_CONFIG_PRIORITY_SECURITY=y

#
# Default Special Groups
#
CONFIG_GRKERNSEC_PROC_GID=1001
CONFIG_GRKERNSEC_TPE_UNTRUSTED_GID=1005
CONFIG_GRKERNSEC_SYMLINKOWN_GID=1006

# PaX
#
CONFIG_PAX=y

#
# PaX Control
#
CONFIG_PAX_SOFTMODE=y
CONFIG_PAX_EI_PAX=y
CONFIG_PAX_PT_PAX_FLAGS=y
CONFIG_PAX_XATTR_PAX_FLAGS=y
# CONFIG_PAX_NO_ACL_FLAGS is not set
CONFIG_PAX_HAVE_ACL_FLAGS=y
# CONFIG_PAX_HOOK_ACL_FLAGS is not set

#
# Non-executable pages
#
CONFIG_PAX_NOEXEC=y
CONFIG_PAX_PAGEEXEC=y
CONFIG_PAX_EMUTRAMP=y
CONFIG_PAX_MPROTECT=y
# CONFIG_PAX_MPROTECT_COMPAT is not set
# CONFIG_PAX_ELFRELOCS is not set
CONFIG_PAX_KERNEXEC_PLUGIN_METHOD=""

#
# Address Space Layout Randomization
#
CONFIG_PAX_ASLR=y
CONFIG_PAX_RANDKSTACK=y
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y

#
# Miscellaneous hardening features
#
CONFIG_PAX_MEMORY_SANITIZE=y
CONFIG_PAX_MEMORY_STACKLEAK=y
CONFIG_PAX_MEMORY_STRUCTLEAK=y
CONFIG_PAX_REFCOUNT=y
CONFIG_PAX_USERCOPY=y
# CONFIG_PAX_USERCOPY_DEBUG is not set
CONFIG_PAX_SIZE_OVERFLOW=y
CONFIG_PAX_LATENT_ENTROPY=y

#
# Memory Protections
#
CONFIG_GRKERNSEC_KMEM=y
CONFIG_GRKERNSEC_IO=y
CONFIG_GRKERNSEC_JIT_HARDEN=y
CONFIG_GRKERNSEC_PERF_HARDEN=y
CONFIG_GRKERNSEC_RAND_THREADSTACK=y
CONFIG_GRKERNSEC_PROC_MEMMAP=y
CONFIG_GRKERNSEC_KSTACKOVERFLOW=y
CONFIG_GRKERNSEC_BRUTE=y
CONFIG_GRKERNSEC_MODHARDEN=y
CONFIG_GRKERNSEC_HIDESYM=y
CONFIG_GRKERNSEC_RANDSTRUCT=y
# CONFIG_GRKERNSEC_RANDSTRUCT_PERFORMANCE is not set
CONFIG_GRKERNSEC_KERN_LOCKOUT=y
#
# Role Based Access Control Options
#
# CONFIG_GRKERNSEC_NO_RBAC is not set
# CONFIG_GRKERNSEC_ACL_HIDEKERN is not set
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=30

#
# Filesystem Protections
#
CONFIG_GRKERNSEC_PROC=y
# CONFIG_GRKERNSEC_PROC_USER is not set
CONFIG_GRKERNSEC_PROC_USERGROUP=y
CONFIG_GRKERNSEC_PROC_ADD=y
CONFIG_GRKERNSEC_LINK=y
CONFIG_GRKERNSEC_SYMLINKOWN=y
CONFIG_GRKERNSEC_FIFO=y
CONFIG_GRKERNSEC_SYSFS_RESTRICT=y
# CONFIG_GRKERNSEC_ROFS is not set
CONFIG_GRKERNSEC_DEVICE_SIDECHANNEL=y
CONFIG_GRKERNSEC_CHROOT=y
CONFIG_GRKERNSEC_CHROOT_MOUNT=y
CONFIG_GRKERNSEC_CHROOT_DOUBLE=y
CONFIG_GRKERNSEC_CHROOT_PIVOT=y
CONFIG_GRKERNSEC_CHROOT_CHDIR=y
CONFIG_GRKERNSEC_CHROOT_CHMOD=y
CONFIG_GRKERNSEC_CHROOT_FCHDIR=y
CONFIG_GRKERNSEC_CHROOT_MKNOD=y
CONFIG_GRKERNSEC_CHROOT_SHMAT=y
CONFIG_GRKERNSEC_CHROOT_UNIX=y
CONFIG_GRKERNSEC_CHROOT_FINDTASK=y
CONFIG_GRKERNSEC_CHROOT_NICE=y
CONFIG_GRKERNSEC_CHROOT_SYSCTL=y
CONFIG_GRKERNSEC_CHROOT_RENAME=y
CONFIG_GRKERNSEC_CHROOT_CAPS=y
CONFIG_GRKERNSEC_CHROOT_INITRD=y

#
# Kernel Auditing
#
# CONFIG_GRKERNSEC_AUDIT_GROUP is not set
# CONFIG_GRKERNSEC_EXECLOG is not set
CONFIG_GRKERNSEC_RESLOG=y
# CONFIG_GRKERNSEC_CHROOT_EXECLOG is not set
# CONFIG_GRKERNSEC_AUDIT_PTRACE is not set
# CONFIG_GRKERNSEC_AUDIT_CHDIR is not set
# CONFIG_GRKERNSEC_AUDIT_MOUNT is not set
CONFIG_GRKERNSEC_SIGNAL=y
# CONFIG_GRKERNSEC_FORKFAIL is not set
CONFIG_GRKERNSEC_TIME=y
CONFIG_GRKERNSEC_PROC_IPADDR=y
CONFIG_GRKERNSEC_RWXMAP_LOG=y

#
# Executable Protections
#
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_HARDEN_PTRACE=y
CONFIG_GRKERNSEC_PTRACE_READEXEC=y
CONFIG_GRKERNSEC_SETXID=y
CONFIG_GRKERNSEC_HARDEN_IPC=y
CONFIG_GRKERNSEC_TPE=y
# CONFIG_GRKERNSEC_TPE_ALL is not set
# CONFIG_GRKERNSEC_TPE_INVERT is not set
CONFIG_GRKERNSEC_TPE_GID=1005

#
# Network Protections
#
CONFIG_GRKERNSEC_BLACKHOLE=y
CONFIG_GRKERNSEC_NO_SIMULT_CONNECT=y
# CONFIG_GRKERNSEC_SOCKET is not set

#
# Physical Protections
#
CONFIG_GRKERNSEC_DENYUSB=y
# CONFIG_GRKERNSEC_DENYUSB_FORCE is not set

#
# Sysctl Support
#
CONFIG_GRKERNSEC_SYSCTL=y
# CONFIG_GRKERNSEC_SYSCTL_DISTRO is not set
CONFIG_GRKERNSEC_SYSCTL_ON=y

#
# Logging Options
#
CONFIG_GRKERNSEC_FLOODTIME=10
CONFIG_GRKERNSEC_FLOODBURST=6


sysctl options, used mostly for docker test.
Code: Select all
# Chroot options
kernel.grsecurity.chroot_deny_sysctl = 1
kernel.grsecurity.chroot_caps = 0
kernel.grsecurity.chroot_execlog = 1
kernel.grsecurity.chroot_restrict_nice = 1
kernel.grsecurity.chroot_deny_mknod = 0
kernel.grsecurity.chroot_deny_chmod = 0
kernel.grsecurity.chroot_deny_pivot = 0
kernel.grsecurity.chroot_enforce_chdir = 1
kernel.grsecurity.chroot_deny_chroot = 0
kernel.grsecurity.chroot_deny_fchdir = 1
kernel.grsecurity.chroot_deny_mount = 0
kernel.grsecurity.chroot_deny_unix = 1
kernel.grsecurity.chroot_deny_shmat = 1
kernel.grsecurity.chroot_enforce_chdir = 1
kernel.grsecurity.chroot_findtask = 1
#kernel.grsecurity.chroot_restrict_nice = 0

kernel.pax.softmode = 1

# Prevent any new USB devices from being recognized by the OS.
kernel.grsecurity.deny_new_usb = 0

kernel.grsecurity.grsec_lock = 0
cdrcnm
 
Posts: 1
Joined: Wed Aug 05, 2015 3:33 am

Return to grsecurity support

cron