[ipsec][strongswan]strongswan源码分析--(零)引子
strongswan sa
该系列文章的全部内容都是基于 strongswan 5.7.2版本
资料
https://wiki.strongswan.org/projects/strongswan/wiki/IntroductionTostrongSwan
编译
略
启动
ipsec start
rpm安装的
[root@D129 ~]# systemctl start strongswan
[root@D129 ~]# swanctl --version
strongSwan swanctl 5.7.1
[root@D129 ~]#
注：通过rpm安装的已经没有ipsec命令了，只有swanctl命令。
进程信息
TODO
结构
- start daemon
- keying daemon
架构图与插件
TODO
查看插件
[root@T9 sbin]# ./swanctl --stats
uptime: 2 minutes, since Dec 14 16:04:11 2018
worker threads: 16 total, 11 idle, working: 4/0/1/0
job queues: 0/0/0/0
jobs scheduled: 0
IKE_SAs: 0 total, 0 half-open
mallinfo: sbrk 2297856, mmap 0, used 288560, free 2009296
loaded plugins: charon aes des rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp curve25519 xcbc cmac hmac attr kernel-netlink resolve socket-default stroke vici updown xauth-generic counters
配置运行
传统配置方法
使用ipsec命令（ipsec stroke接口）和ipsec.conf and ipsec.secrets配置文件。
新的配置方法
使用swanctl命令（vici接口）swanctl命令和swanctl.conf配置文件。
strongswang.conf中是全局和插件配置。
其他配置方法
- 使用数据库插件，在数据库中进行配置。
- 使用其他插件，如networkmanager等。
详细的配置文档
- 看ipsec.conf和swanctl.conf的注释。
- man
man -M ../share/man/ strongswan.conf
man -M ../share/man/ swanctl.conf
man -M ../share/man/ ipsec.conf.5
配置示例
[root@T9 OUTPUT]# cat ./etc/swanctl/conf.d/test.conf
connections {
net-net {
remote_addrs = 192.168.7.129
ppk_id = mykey
ppk_required = yes
local {
auth = psk
}
remote {
auth = psk
}
children {
net-net {
local_ts = 10.129.0.0/16
remote_ts = 10.9.0.0/16
}
}
}
}
secrets {
ppk {
secret = 1234
id = mykey
}
}
重新加载
[root@D129 ~]# swanctl --load-all
loaded ppk secret 'ppk'
no authorities found, 0 unloaded
no pools found, 0 unloaded
loaded connection 'net-net'
successfully loaded 1 connections, 0 unloaded
[root@D129 ~]# swanctl --list-conn
net-net: IKEv1/2, no reauthentication, rekeying every 14400s
ppk: mykey, required
local: %any
remote: 192.168.7.9
local pre-shared key authentication:
remote pre-shared key authentication:
net-net: TUNNEL, rekeying every 3600s
local: 10.9.0.0/16
remote: 10.129.0.0/16
用法
ipsec up <name>
ipsec down <name>
ipsec reload
ipsec update
ipsec restart
ipsec list
ipsec status
ipsec statusall
logs
日志文件定义在strongswan.conf中。
使用ipsec start --nofork, 日志会输出在console，用来debug。
加密库
三个加密库任选其一：
libgmp
默认使用的，GNU的
libcrypto
openssl的库
libgcrypto
也是GNU的。www.gnupg.org
依赖的内核模块
ah4
ah6
esp4
esp6
xfrm4_tunnel
xfrm6_tunnel
xfrm_user
ip_tunnel
tunnel
tunnel6
xfrm4_mode_tunnel
xfrm6_mode_tunnel
祥见：http://wiki.strongswan.org/projects/strongswan/wiki/KernelModules
child sa
构成
A CHILD_SA consists of two components:
The actual __IPsec SAs__ (there are two, one in each direction) describing
the algorithms and keys used to encrypt and authenticate the traffic
The __policies__ (there are at least two) that define which network
traffic shall use such an SA.
定义
strongSwan installs the negotiated IPsec SAs and SPs into the kernel
by using a platform dependent kernel API.
The actual IPsec traffic is not handled by strongSwan but instead by
the network and IPsec stack of the operating system kernel.
sa信息查看与调试
ip xfrm status
ip xfrm policy
使用-s能查看更丰富的信息。
证书
- 使用ipsec kpi可以生成。
见：https://wiki.strongswan.org/projects/strongswan/wiki/SimpleCA - 使用openssl生成。
转发
隧道
路由
略
MSS/MTU
https://wiki.strongswan.org/projects/strongswan/wiki/ForwardingAndSplitTunneling#MTUMSS-issues
VICI interface
https://wiki.strongswan.org/projects/strongswan/wiki/Vici
编译DEBUG
./configure --prefix=/root/OUTPUT --exec-prefix=/root/OUTPUT CFLAGS="-g -O0"
gdb
只启动 charon一个daemon进程，功能也是正常的。
gdb /root/OUTPUT/libexec/ipsec/charon
./swanctl --load-all
./ipsec up net-net
代码
charon进程的入口
src/charon/charon.c:main()
接口
./src/libcharon/kernel/kernel_interface.c
架构流程图
传统方式启动并加载ipsec的流程图
通过plugin方式调用ipsec调用内核接口的原理
system的方式启动并加载ipsec的流程图
ipsec初始化
接口
sa的参数：
src/libcharon/kernel/kernel_ipsec.h
struct kernel_ipsec_add_sa_t
调用栈
#0 add_ipsec_interface (this=0x60de50, constructor=0x7ffff305ef82 <kernel_netlink_ipsec_create>)
at kernel/kernel_interface.c:738
#1 0x00007ffff78c66fc in kernel_ipsec_register (plugin=0x62e990, feature=0x7ffff326d298 <f.9409+24>, reg=true,
data=0x7ffff305ef82 <kernel_netlink_ipsec_create>) at kernel/kernel_ipsec.c:28
#2 0x00007ffff7b9d82a in plugin_feature_load (plugin=0x62e990, feature=0x7ffff326d298 <f.9409+24>,
reg=0x7ffff326d280 <f.9409>) at plugins/plugin_feature.c:451
#3 0x00007ffff7b9aec5 in load_feature (this=0x60a590, provided=0x62f420, level=4) at plugins/plugin_loader.c:786
#4 0x00007ffff7b9b12a in load_provided (this=0x60a590, provided=0x62f420, level=3)
at plugins/plugin_loader.c:861
#5 0x00007ffff7b9ab54 in load_registered (this=0x60a590, registered=0x62f300, level=3)
at plugins/plugin_loader.c:688
#6 0x00007ffff7b9ac8b in load_dependencies (this=0x60a590, provided=0x630810, level=3)
at plugins/plugin_loader.c:730
#7 0x00007ffff7b9ae98 in load_feature (this=0x60a590, provided=0x630810, level=3) at plugins/plugin_loader.c:784
#8 0x00007ffff7b9b12a in load_provided (this=0x60a590, provided=0x630810, level=2)
at plugins/plugin_loader.c:861
#9 0x00007ffff7b9ab54 in load_registered (this=0x60a590, registered=0x6306f0, level=2)
at plugins/plugin_loader.c:688
#10 0x00007ffff7b9ac8b in load_dependencies (this=0x60a590, provided=0x610550, level=2)
at plugins/plugin_loader.c:730
#11 0x00007ffff7b9ae98 in load_feature (this=0x60a590, provided=0x610550, level=2) at plugins/plugin_loader.c:784
#12 0x00007ffff7b9b12a in load_provided (this=0x60a590, provided=0x610550, level=1)
at plugins/plugin_loader.c:861
#13 0x00007ffff7b9ab54 in load_registered (this=0x60a590, registered=0x610460, level=1)
at plugins/plugin_loader.c:688
#14 0x00007ffff7b9ac8b in load_dependencies (this=0x60a590, provided=0x60f830, level=1)
at plugins/plugin_loader.c:730
#15 0x00007ffff7b9ae98 in load_feature (this=0x60a590, provided=0x60f830, level=1) at plugins/plugin_loader.c:784
#16 0x00007ffff7b9b12a in load_provided (this=0x60a590, provided=0x60f830, level=0)
at plugins/plugin_loader.c:861
#17 0x00007ffff7b9b196 in load_features (this=0x60a590) at plugins/plugin_loader.c:882
#18 0x00007ffff7b9c0e0 in load_plugins (this=0x60a590,
list=0x402d48 "aes des rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp curve25519 xcbc cmac hmac attr kernel-netlink resolve socket-"...)
at plugins/plugin_loader.c:1271
#19 0x00007ffff78ad2d8 in initialize (this=0x60aa90,
plugins=0x402d48 "aes des rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp curve25519 xcbc cmac hmac attr kernel-netlink resolve socket-"...)
at daemon.c:900
#20 0x000000000040241b in main (argc=1, argv=0x7fffffffe4f8) at charon.c:422
add policy的调用栈
响应 swanctl --load-all命令。 调用了三次，添加了三个policy
#0 add_policy (this=0x634310, id=0x7ffff21f85c0, data=0x7ffff21f8590) at kernel_netlink_ipsec.c:2801
#1 0x00007ffff78c4b0b in add_policy (this=0x60de50, id=0x7ffff21f85c0, data=0x7ffff21f8590)
at kernel/kernel_interface.c:481
#2 0x00007ffff78cf652 in install_policies_inbound (this=0x7fffc0004510, my_addr=0x7fffc0004790,
other_addr=0x7fffc0004880, my_ts=0x7fffc0004b30, other_ts=0x7fffc0004f40, my_sa=0x7ffff21f86b0,
other_sa=0x7ffff21f86d0, type=POLICY_IPSEC, priority=POLICY_PRIORITY_ROUTED, manual_prio=0)
at sa/child_sa.c:1005
#3 0x00007ffff78cf866 in install_policies_internal (this=0x7fffc0004510, my_addr=0x7fffc0004790,
other_addr=0x7fffc0004880, my_ts=0x7fffc0004b30, other_ts=0x7fffc0004f40, my_sa=0x7ffff21f86b0,
other_sa=0x7ffff21f86d0, type=POLICY_IPSEC, priority=POLICY_PRIORITY_ROUTED, manual_prio=0, outbound=true)
at sa/child_sa.c:1077
#4 0x00007ffff78d0022 in install_policies (this=0x7fffc0004510) at sa/child_sa.c:1266
#5 0x00007ffff78e2c61 in install (this=0x60ec30, peer=0x7fffc0003c30, child=0x7fffc0002dc0)
at sa/trap_manager.c:317
#6 0x00007ffff281daa8 in run_start_action (this=0x63d760, peer_cfg=0x7fffc0003c30, child_cfg=0x7fffc0002dc0)
at vici_config.c:2072
#7 0x00007ffff281e0d8 in handle_start_actions (this=0x63d760, peer_cfg=0x7fffc0003c30, undo=false)
at vici_config.c:2233
#8 0x00007ffff281e50f in merge_config (this=0x63d760, peer_cfg=0x7fffc0003c30) at vici_config.c:2310
#9 0x00007ffff281ee8c in _cb_config_sn (request=0x7ffff21f8b90, message=0x7fffc00020e0, ctx=0x7ffff21f8b40,
name=0x7fffc0000f20 "net-net") at vici_config.c:2542
#10 0x00007ffff280d394 in parse (this=0x7fffc00020e0, ctx=0x7ffff21f8b40,
section=0x7ffff281e548 <_cb_config_sn>, kv=0x0, li=0x0, user=0x7ffff21f8b90) at vici_message.c:530
#11 0x00007ffff281eefe in _cb_load_conn (this=0x63d760, name=0x63d9f0 "load-conn", id=1, message=0x7fffc00020e0)
at vici_config.c:2554
#12 0x00007ffff280f0f6 in process_request (this=0x63ad10, name=0x7ffff21f8c30 "load-conn", id=1, data=...)
at vici_dispatcher.c:289
#13 0x00007ffff280f3c2 in _cb_inbound (this=0x63ad10, id=1, data=...) at vici_dispatcher.c:346
#14 0x00007ffff280b92f in _cb_process_queue (sel=0x7fffc0000c40) at vici_socket.c:508
#15 0x00007ffff7b9e138 in execute (this=0x7fffc0001c70) at processing/jobs/callback_job.c:77
#16 0x00007ffff7b9e6a7 in process_job (this=0x609650, worker=0x6107c0) at processing/processor.c:235
#17 0x00007ffff7b9e9a9 in process_jobs (worker=0x6107c0) at processing/processor.c:321
#18 0x00007ffff7bb6df9 in thread_main (this=0x611ab0) at threading/thread.c:331
#19 0x00007ffff7373dd5 in start_thread () from /lib64/libpthread.so.0
#20 0x00007ffff6e98ead in clone () from /lib64/libc.so.6
add sa的调用栈
响应 ipsec up net-net命令。调用两次之后又调用三次add_policy
(gdb) bt
#0 add_sa (this=0x634310, id=0x7ffff09f5930, data=0x7ffff09f58b0) at kernel_netlink_ipsec.c:1548
#1 0x00007ffff78c4962 in add_sa (this=0x60de50, id=0x7ffff09f5930, data=0x7ffff09f58b0)
at kernel/kernel_interface.c:426
#2 0x00007ffff78cf2c2 in install_internal (this=0x7fffac005220, encr=..., integ=..., spi=1610579395, cpi=0,
initiator=true, inbound=true, tfcv3=true) at sa/child_sa.c:908
#3 0x00007ffff78cf3a4 in install (this=0x7fffac005220, encr=..., integ=..., spi=1610579395, cpi=0,
initiator=true, inbound=true, tfcv3=true) at sa/child_sa.c:921
#4 0x00007ffff78f3854 in select_and_install (this=0x7fffc4002250, no_dh=true, ike_auth=true)
at sa/ikev2/tasks/child_create.c:712
#5 0x00007ffff78f6980 in process_i (this=0x7fffc4002250, message=0x7fffe0001010)
at sa/ikev2/tasks/child_create.c:1645
#6 0x00007ffff78e8dac in process_response (this=0x7fffc4001380, message=0x7fffe0001010)
at sa/ikev2/task_manager_v2.c:745
#7 0x00007ffff78eb00c in process_message (this=0x7fffc4001380, msg=0x7fffe0001010)
at sa/ikev2/task_manager_v2.c:1613
#8 0x00007ffff78d545c in process_message (this=0x7fffc4000a40, message=0x7fffe0001010) at sa/ike_sa.c:1572
#9 0x00007ffff78cabe4 in execute (this=0x7fffe00011b0) at processing/jobs/process_message_job.c:74
#10 0x00007ffff7b9e6a7 in process_job (this=0x609650, worker=0x63f650) at processing/processor.c:235
#11 0x00007ffff7b9e9a9 in process_jobs (worker=0x63f650) at processing/processor.c:321
#12 0x00007ffff7bb6df9 in thread_main (this=0x63f680) at threading/thread.c:331
#13 0x00007ffff7373dd5 in start_thread () from /lib64/libpthread.so.0
#14 0x00007ffff6e98ead in clone () from /lib64/libc.so.6
(gdb)
https://en.wikipedia.org/wiki/Policy-based_routing
http://kernelspec.blogspot.com/2014/10/ipsec-implementation-in-linux-kernel.html
更多strongswan系列的其他内容：
https://www.cnblogs.com/hugetong/tag/strongswan/
[ipsec][strongswan]strongswan源码分析--(零)引子的更多相关文章
- epoll(2) 使用及源码分析的引子
epoll(2) 使用及源码分析的引子 本文代码取自内核版本 4.17 epoll(2) - I/O 事件通知设施. epoll 是内核在2.6版本后实现的,是对 select(2)/poll(2) ...
- [Abp 源码分析]零、文章目录
0.系列文章目录 一.Abp 框架启动流程分析 二.模块系统 三.依赖注入 四.模块配置 五.系统设置 六.工作单元的实现 七.仓储与 Entity Framework Core 八.缓存管理 九.事 ...
- [dev][ipsec][dpdk] strongswan/dpdk源码分析之ipsec算法配置过程
1 简述 storngswan的配置里用一种固定格式的字符串设置了用于协商的预定义算法.在包协商过程中strongswan将字符串转换为固定的枚举值封在数据包里用于传输. 协商成功之后,这组被协商选中 ...
- 「从零单排canal 03」 canal源码分析大纲
在前面两篇中,我们从基本概念理解了canal是一个什么项目,能应用于什么场景,然后通过一个demo体验,有了基本的体感和认识. 从这一篇开始,我们将从源码入手,深入学习canal的实现方式.了解can ...
- QTimer源码分析(以Windows下实现为例)
QTimer源码分析(以Windows下实现为例) 分类: Qt2011-04-13 21:32 5026人阅读 评论(0) 收藏 举报 windowstimerqtoptimizationcallb ...
- 【JUC】JDK1.8源码分析之CountDownLatch（五）
一.前言 分析完了CyclicBarrier后,下面分析CountDownLatch,CountDownLatch用于同步一个或多个任务,强制他们等待由其他任务执行的一组操作完成.CountDownL ...
- 《深入理解Spark：核心思想与源码分析》（前言及第1章）
自己牺牲了7个月的周末和下班空闲时间,通过研究Spark源码和原理,总结整理的<深入理解Spark:核心思想与源码分析>一书现在已经正式出版上市,目前亚马逊.京东.当当.天猫等网站均有销售 ...
- Mahout源码分析之 -- 文档向量化TF-IDF
fesh个人实践,欢迎经验交流!Blog地址:http://www.cnblogs.com/fesh/p/3775429.html Mahout之SparseVectorsFromSequenceFi ...
- 《深入理解Spark：核心思想与源码分析》一书正式出版上市
自己牺牲了7个月的周末和下班空闲时间,通过研究Spark源码和原理,总结整理的<深入理解Spark:核心思想与源码分析>一书现在已经正式出版上市,目前亚马逊.京东.当当.天猫等网站均有销售 ...
随机推荐
- 【tensorflow基础】ubuntu-tensorflow可视化工具tensorboard-No dashboards are active for the current data set.
前言 今天基于tensorflow训练一个检测模型,本应看到训练曲线的,却只见到一个文件events.out.tfevents.1570520647.hostname,后来发现这个文件可以查看训练曲线 ...
- soapUI使用-调用post方法
前言 soapUI的安装请查看此链接:https://www.cnblogs.com/linxiu-0925/p/10138771.html 使用步骤 1打开soapUI 2新建一个项目:New SO ...
- vs2019 中文离线安装包下载
1. 通过在https://visualstudio.microsoft.com/zh-hans/downloads/ 下载VS2019, 之后会下载vs_enterprise__78682482.1 ...
- 阿里云移动推送 ios项目添加SDK步骤
添加阿里云Pods仓库和各产品SDK Pod依赖,配置步骤如下: 1. CocoaPods集成添加阿里云Pods仓库,Podfile添加: source 'https://github.com/ali ...
- zookeeper学习整理
概述 zookeeper是一个高可用的分布式数据管理与协调框架,基于ZAB算法实现,主要解决分布式一致性问题. https://www.cnblogs.com/felixzh/p/5869212.ht ...
- IDEA 2019 注册码
CATF44LT7C-eyJsaWNlbnNlSWQiOiJDQVRGNDRMVDdDIiwibGljZW5zZWVOYW1lIjoiVmxhZGlzbGF2IEtvdmFsZW5rbyIsImFz ...
- python的安装与配置
pyhton的下载与安装 1.python官网地址:https://www.python.org 2.下载 Python 编辑器PyCharm PyCharm 是一款功能强大的 Python 编辑器 ...
- Java开发笔记（一百三十九）JavaFX的输入框
循着Swing的旧例,JavaFX仍然提供了三种文本输入框,分别是单行输入框TextField.密码输入框PasswordField.多行输入框TextArea.这些输入框都由抽象类TextInput ...
- 【C++札记】友元
C++封装的类增加了对类中数据成员的访问限制,从而保证了安全性.如想访问类中的私有成员需要通过类中提供的公共接口来访问,这样间接的访问方式,无疑使得程序的运行效率有所降低. 友元的提出可以使得类外的函 ...
- linux net通信 基于密钥
配置SSHD服务 SSH(Secure Shell)是一种能够以安全的方式提供远程登录的协议,也是目前远程管理 Linux 系统的首选方式.在此之前,一般使用 FTP 或 Telnet 来进行远程登录 ...