分类： Sec

https://jlajara.gitlab.io/posts/2018/11/26/process-migration.html

https://security.stackexchange.com/questions/90578/how-does-process-migration-work-in-meterpreter

继续阅读Tricks about how Meterpreter do migration shit.

https://www.apple.com.cn/privacy/government-information-requests/

https://www.apple.com/legal/transparency/

https://www.apple.com/legal/transparency/cn.html

https://www.apple.com/legal/privacy/law-enforcement-guidelines-outside-us-cn.pdf

https://serverfault.com/questions/704806/how-to-get-autoscaling-group-instances-ip-adresses

继续阅读How to get Autoscaling group Instances IP adresses

1.创建一个与旧系统同样系统的虚拟机，选择最小化配置省钱。

2.停止新虚机，把磁盘解除挂载。

3.将磁盘挂载到老虚机上

4.建立挂载点，挂载磁盘：

mkdir /new
mount /dev/nvme1n1p1 /new

4.删除/new/中除了”/dev/*”,”/proc/*”,”/sys/*”,”/tmp/*”,”/run/*”,”/mnt/*”,”/media/*”,”/lost+found”,”/new”,”/var/lock/*”,”/boot/*”, “/etc/fstab” 之外的所有文件、目录。

5.拷贝所有内容到新磁盘：

rsync -aAXv / --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found","/new","/var/lock/*","/boot/*", "/etc/fstab"} /new

6.将新磁盘挂回新虚机，更新重新安装内核。

1.拉镜像

docker pull registry

2.建立目录，auth放账户认证信息，home用来映射到容器内存放仓库内镜像文件

mkdir /home/hd/docker_home/
mkdir /home/hd/docker_home/auth/
mkdir /home/hd/docker_home/home/

3.建立认证文件

docker run --entrypoint htpasswd registry -Bbn user pass >/home/hd/docker_home/auth/htpasswd

4.启动仓库

docker run -d -p 5000:5000 --restart=always --name brian-docker  -v /home/hd/docker_home/home:/var/lib/registry -v /home/hd/docker_home/auth:/auth  -e "REGISTRY_AUTH=htpasswd"  -e REGISTRY_AUTH_HTPASSWD_REALM="Registry Realm"  -e REGISTRY_AUTH_HTPASSWD_PATH=/auth/htpasswd  registry

5.本地docker服务配置文件里添加

"insecure-registries" : [
    "192.168.31.101:5000",
    "hub.docker.jiankunking.io:5000"
  ],

https://www.maketecheasier.com/see-pc-startup-and-shutdown-history-in-windows/

https://serverfault.com/questions/702828/windows-server-restart-shutdown-history

继续阅读通过windows日志系统查找服务器重启、关闭原因

https://www.bantrain.com/how-to-install-haproxy-2-0-in-amazon-linux-2-centos-rhel/

First, Install dependencies needed to build HAProxy

	
yum install -y make gcc gcc-c++ pcre-devel openssl-devel readline-devel systemd-devel zlib-devel

Download Lua source code and then Install Lua

curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz
tar zxf lua-5.3.5.tar.gz
cd lua-5.3.5
make linux test
make linux install
cd ..

Download OpenSSL source code and then Install OpenSSL

curl -R -O https://www.openssl.org/source/openssl-1.1.1d.tar.gz
tar xvzf openssl-1.1.1d.tar.gz
cd openssl-1.1.1d
./config --prefix=/usr/local/openssl-1.1.1d shared
make
make install

Download HAProxy source code and then Install HAProxy

curl -R -O
tar -xzf haproxy-2.0.7.tar.gz
cd haproxy-2.0.7
make -j $(nproc) TARGET=linux-glibc USE_OPENSSL=1 SSL_LIB=/usr/local/openssl-1.1.1d/lib SSL_INC=/usr/local/openssl-1.1.1d/include USE_ZLIB=1 USE_LUA=1 LUA_LIB=/usr/local/lib/ LUA_INC=/usr/local/include/ USE_PCRE=1 USE_SYSTEMD=1 EXTRA_OBJS="contrib/prometheus-exporter/service-prometheus.o"
make install
cp /usr/local/sbin/haproxy /usr/sbin/haproxy
useradd -M -r -s /sbin/nologin haproxy

Add Service for HAProxy

nano /etc/systemd/system/haproxy.service

Then paste in the following

[Unit]
Description=HAProxy Load Balancer
After=network.target
[Service]
Environment=LD_LIBRARY_PATH=/usr/local/openssl-1.1.1d/lib/
Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid" "EXTRAOPTS=-S /run/haproxy-master.sock"
ExecStartPre=/usr/local/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS
ExecStart=/usr/local/sbin/haproxy -Ws -f $CONFIG -p $PIDFILE $EXTRAOPTS
ExecReload=/usr/local/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS
ExecReload=/bin/kill -USR2 $MAINPID
KillMode=mixed
Restart=always
SuccessExitStatus=143
Type=notify
[Install]
WantedBy=multi-user.target

Then finish HAProxy Installation Process by running

systemctl daemon-reload
mkdir -p /etc/haproxy
touch /etc/haproxy/haproxy.cfg
systemctl enable haproxy
systemctl start haproxy
cd ..

Optional remove build dependencies for haproxy

yum remove readline-devel pcre-devel openssl-devel

如果haproxy -V报错：openssl: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory

ln -s /usr/local/openssl-1.1.1d/lib/libssl.so.1.1 /usr/lib64/libssl.so.1.1
ln -s /usr/local/openssl-1.1.1d/lib/libcrypto.so.1.1 /usr/lib64/libcrypto.so.1.1

https://segmentfault.com/a/1190000005797776

前言

自己做了一个iOS App，需要访问自己的网站获取数据，但是系统默认只能直接访问https的网站。不想让应用改用http的服务。因此，研究如何启用https，本文即是介绍如何在CentOS上配合Nginx使用CertBot。

环境

• CentOS（CentOS Linux release 7.2.1511）
• Nginx（nginx version: nginx/1.6.3）
• ExpressJS应用

安装CertBot

命令行，键入：

sudo yum install epel-release
sudo yum install certbot

配置Nginx

这里我不想使用CertBot的standalone模式，这个模式虽然可以配置好服务器，但是以后Renew的时候，需要让服务停止一下，再启动。因此抛弃这个模式，我们使用Webroot配置模式。

因为，CertBot在验证服务器域名的时候，会生成一个随机文件，然后CertBot的服务器会通过HTTP访问你的这个文件，因此要确保你的Nginx配置好，以便可以访问到这个文件。

修改你的服务器配置，在server模块添加：

location ^~ /.well-known/acme-challenge/ {
   default_type "text/plain";
   root     /usr/share/nginx/html;
}

location = /.well-known/acme-challenge/ {
   return 404;
}

可以看到，上面的root，我们让他指向了/usr/share/nginx/html，因为我的应用是通过NodeJS的ExpressJS写的，如果修改源代码的话，比较麻烦。因此我就让检验的链接指向了nginx默认的文件夹下。

接着重新加载Nginx配置：

sudo service nginx reload

然后在命令行输入：

sudo certbot certonly --webroot -w /usr/share/nginx/html/ -d your.domain.com

上面记得替换your.domain.com为你自己的域名。

如果提示：

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/your.domain.com/fullchain.pem. Your cert
   will expire on 20XX-09-23. To obtain a new or tweaked version of
   this certificate in the future, simply run certbot again. To
   non-interactively renew *all* of your certificates, run "certbot
   renew"
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

证书生成成功！

启用443端口

同样，修改Nginx的虚拟主机配置文件，新建一个443端口的server配置：

server {
        listen 443 ssl;
        listen [::]:443 ssl ipv6only=on;

        ssl_certificate /etc/letsencrypt/live/your.domain.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/your.domain.com/privkey.pem;
        ssl_trusted_certificate /etc/letsencrypt/live/your.domain.com/chain.pem;
        
        // ... other settings ...
}

上面记得替换your.domain.com为你自己的域名。

接着重新加载Nginx配置：

sudo service nginx reload

现在通过浏览器访问你的网站：https://your.domain.com试试，如果看到浏览器的绿色标志，恭喜你设置成功！

不过由于这个证书的时效只有90天，我们需要设置自动更新的功能，帮我们自动更新证书的时效。

自动更新证书

先在命令行模拟证书更新：

sudo certbot renew --dry-run

模拟更新成功的效果如下：

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/your.domain.com.conf
-------------------------------------------------------------------------------
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates below have not been saved.)

Congratulations, all renewals succeeded. The following certs have been renewed:
  /etc/letsencrypt/live/your.domain.com/fullchain.pem (success)
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates above have not been saved.)

既然模拟成功，我们就使用crontab -e的命令来启用自动任务，命令行：

sudo crontab -e

添加配置：

30 2 * * 1 /usr/bin/certbot renew  >> /var/log/le-renew.log

上面的执行时间为：每周一半夜2点30分执行renew任务。

你可以在命令行执行/usr/bin/certbot renew >> /var/log/le-renew.log看看是否执行正常，如果一切OK，那么我们的配置到此结束！

https://www.cyberciti.biz/faq/linux-add-a-swap-file-howto/

Procedure To Add a Swap File Under Linux

You need to use the dd command to create swap file. The mkswap command is used to set up a Linux swap area on a device or in a file.

Step #1: Login as the Root User

Open a terminal window (select Applications > Accessories > Terminal) or login to remote server using the ssh client. Switch to the root user by typing su - (or sudo -s) and entering the root password, when prompted:
$ su -
OR
$ sudo -s

Step #2: Create Storage File

Type the following command to create 512MB swap file (1024 * 512MB = 524288 block size):
# dd if=/dev/zero of=/swapfile1 bs=1024 count=524288
Sample outputs:

524288+0 records in
524288+0 records out
536870912 bytes (537 MB) copied, 3.23347 s, 166 MB/s

Where,

1. if=/dev/zero : Read from /dev/zero file. /dev/zero is a special file in that provides as many null characters to build storage file called /swapfile1.
2. of=/swapfile1 : Read from /dev/zero write storage file to /swapfile1.
3. bs=1024 : Read and write 1024 BYTES bytes at a time.
4. count=524288 : Copy only 523288 BLOCKS input blocks.

Step #3: Secure swap file

Setup correct file permission for security reasons, enter:
# chown root:root /swapfile1
# chmod 0600 /swapfile1
A world-readable swap file is a huge local vulnerability. The above commands make sure only root user can read and write to the file.

Step #4: Set up a Linux swap area

Type the following command to set up a Linux swap area in a file:
# mkswap /swapfile1
Sample outputs:

Setting up swapspace version 1, size = 524284 KiB
no label, UUID=0e5e7c60-bbba-4089-a76c-2bb29c0f0839

Step #5: Enabling the swap file

Finally, activate /swapfile1 swap space immediately, enter:
# swapon /swapfile1

Step #6: Update /etc/fstab file

To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using a text editor such as vi:
# vi /etc/fstab
Append the following line:
/swapfile1 none swap sw 0 0
Save and close the file. Next time Linux comes up after reboot, it enables the new swap file for you automatically.

How do I verify swap is activated or not?

Simply use the free command:
$ free -m

             total       used       free     shared    buffers     cached
Mem:          1876       1798         77          0        119       1440
-/+ buffers/cache:        237       1638
Swap:         4607          0       4607

How can I display swap usage summary on Linux?

Type the following swapon command:
# swapon -s
Sample outputs:

Filename				Type		Size	Used	Priority
/dev/sda6                               partition	4194296	0	0
/swapfile1                              file		524280	0	-1

Another option is to view /proc/meminfo file:
$ less /proc/meminfo
$ grep -i --color swap /proc/meminfo
Sample outputs:

SwapCached:        30748 kB
SwapTotal:       6291448 kB
SwapFree:        6154008 kB

You can also use top command, atop command, and/or htop command to display information about swap usage:
# top
# atop
# htop
Sample outputs from a database server running on a CentOS Linux server:

  1  [||                        3.9%]     Tasks: 171, 106 thr; 1 running
  2  [                          0.0%]     Load average: 0.06 0.12 0.09 
  3  [||                        2.0%]     Uptime: 22 days, 07:07:28
  4  [                          0.0%]
  5  [                          0.0%]
  6  [                          0.0%]
  7  [                          0.0%]
  8  [                          0.0%]
  Mem[||||||||||||||||||2112/11909MB]
  Swp[|                   134/6143MB]

  PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
 8523 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:00.00 /usr/libexec/mysq
 8524 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:02.74 /usr/libexec/mysq
 8525 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:16.17 /usr/libexec/mysq
 8526 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:06.33 /usr/libexec/mysq
 8528 mysql      20   0 4545M  414M  4816 S  0.0  3.5  4:02.14 /usr/libexec/mysq
 8529 mysql      20   0 4545M  414M  4816 S  0.0  3.5  5:22.00 /usr/libexec/mysq
 8530 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:04.63 /usr/libexec/mysq
 8531 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:50.95 /usr/libexec/mysq
 8532 mysql      20   0 4545M  414M  4816 S  0.0  3.5  0:08.10 /usr/libexec/mysq
 9359 mysql      20   0 4545M  414M  4816 S  0.0  3.5 22:53.28 /usr/libexec/mysq

How can I disable devices and files for paging and swapping on Linux?

You need to use the swapoff command:
# swapoff /swapfile1
# swapon -s

How do I set swappiness on a Linux server?

The syntax is:
# sysctl vm.swappiness=VALUE
# sysctl vm.swappiness=20
OR
# echo VALUE > /proc/sys/vm/swappiness
# echo 30 > /proc/sys/vm/swappiness

The value in /proc/sys/vm/swappiness file controls how aggressively the kernel will swap memory pages. Higher values increase agressiveness, lower values descrease aggressiveness. The default value is 60. To make changes permanent add the following line to /etc/sysctl.conf:

echo 'vm.swappiness=30' >> /etc/sysctl.conf

net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_max_orphans = 32768
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_wmem = 8192 131072 16777216
net.ipv4.tcp_rmem = 32768 131072 16777216
net.ipv4.tcp_mem = 786432 1048576 1572864
net.ipv4.ip_local_port_range = 1024 65000
#net.ipv4.ip_conntrack_max = 65536
#net.ipv4.netfilter.ip_conntrack_max=65536
#net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=180
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
 
vm.swappiness=10
net.ipv4.neigh.default.gc_stale_time=120
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.lo.arp_announce=2