خطوات حماية nginx هامة وزيادة الأمان (كويب سيرفر) وتحسين الشبكة

/usr/local/nginx/conf/

/usr/local/nginx/conf/nginx.conf

/usr/local/nginx/logs/

yum -y install selinux-policy-targeted selinux-policy-devel

cd /opt
wget 'http://garr.dl.sourceforge.net/project/selinuxnginx/se-ngix_1_0_10.tar.gz'

tar -zxvf se-ngix_1_0_10.tar.gz

cd se-ngix_1_0_10/nginx
make

/usr/sbin/semodule -i nginx.pp

getsebool -a | less
getsebool -a | grep off
getsebool -a | grep o

vi /etc/sysctl.conf

# Avoid a smurf attack
net.ipv4.icmp_echo_ignore_broadcasts = 1
 
# Turn on protection for bad icmp error messages
net.ipv4.icmp_ignore_bogus_error_responses = 1
 
# Turn on syncookies for SYN flood attack protection
net.ipv4.tcp_syncookies = 1
 
# Turn on and log spoofed, source routed, and redirect packets
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
 
# No source routed packets here
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
 
# Turn on reverse path filtering
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
 
# Make sure no one can alter the routing tables
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
 
# Don't act as a router
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
 
 
# Turn on execshild
kernel.exec-shield = 1
kernel.randomize_va_space = 1
 
# Tuen IPv6
net.ipv6.conf.default.router_solicitations = 0
net.ipv6.conf.default.accept_ra_rtr_pref = 0
net.ipv6.conf.default.accept_ra_pinfo = 0
net.ipv6.conf.default.accept_ra_defrtr = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.default.dad_transmits = 0
net.ipv6.conf.default.max_addresses = 1
 
# Optimization for port usefor LBs
# Increase system file descriptor limit
fs.file-max = 65535
 
# Allow for more PIDs (to reduce rollover problems); may break some programs 32768
kernel.pid_max = 65536
 
# Increase system IP port limits
net.ipv4.ip_local_port_range = 2000 65000
 
# Increase TCP max buffer size setable using setsockopt()
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 87380 8388608
 
# Increase Linux auto tuning TCP buffer limits
# min, default, and max number of bytes to use
# set max to at least 4MB, or higher if you use very high BDP paths
# Tcp Windows etc
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_window_scaling = 1

cat /proc/sys/net/ipv4/tcp_mem

cat /proc/sys/net/core/rmem_default
cat /proc/sys/net/core/rmem_max

cat /proc/sys/net/core/wmem_default
cat /proc/sys/net/core/wmem_max

echo 'net.core.wmem_max=12582912' >> /etc/sysctl.conf
echo 'net.core.rmem_max=12582912' >> /etc/sysctl.conf

echo 'net.ipv4.tcp_rmem= 10240 87380 12582912' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_wmem= 10240 87380 12582912' >> /etc/sysctl.conf

echo 'net.ipv4.tcp_window_scaling = 1' >> /etc/sysctl.conf

echo 'net.ipv4.tcp_sack = 1' >> /etc/sysctl.conf

echo 'net.ipv4.tcp_no_metrics_save = 1' >> /etc/sysctl.conf

sysctl -p

tcpdump -ni eth0

./configure --without-http_autoindex_module --without-http_ssi_module
make
make install

./configure --help | less

server_tokens off

vi /usr/local/nginx/conf/nginx.conf

  client_body_buffer_size  1K;
  client_header_buffer_size 1k;
  client_max_body_size 1k;
  large_client_header_buffers 2 1k;

  client_body_timeout   10;
  client_header_timeout 10;
  keepalive_timeout     5 5;
  send_timeout          10;

/sbin/iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --set
/sbin/iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --update --seconds 60  --hitcount 15 -j DROP
service iptables save

grep "/login.php??" /usr/local/nginx/logs/access_log
grep "...etc/passwd" /usr/local/nginx/logs/access_log
egrep -i "denied|error|warn" /usr/local/nginx/logs/error_log

find /nginx -user nginx

find /usr/local/nginx/html  -user nginx

ls -l /usr/local/nginx/html/

# find /nginx -name '.?*' -not -name .ht* -or -name '*~' -or -name '*.bak*' -or -name '*.old*'
# find /usr/local/nginx/html/ -name '.?*' -not -name .ht* -or -name '*~' -or -name '*.bak*' -or -name '*.old*'