Vpn

客戶端流量不通過 VPN 路由

  • November 3, 2020

我嘗試使用 Strongswan Android 應用程序在伺服器和 Android 手機之間創建一個簡單的 Strongswan 連接。

我的 Android 手機資訊： Android 8.0.0使用 Samsung Experience 9.0 這是 Galaxy A5 (2017) 型號

我嘗試同時使用 4G 和 Wifi 我的 Strongswan 應用已開啟version 2.3.0，2020 年 6 月更新

我的伺服器資訊：這是一個Ubuntu 18.04最新的 VPS

我的 Strongswan 伺服器配置如下我手動下載Strongswan 5.9.0然後使用

./configure --prefix=/custompath/strongroot --disable-stroke --with-piddir=/custompath/strongroot/var/run --enable-eap-dynamic --enable-eap-mschapv2 --enable-eap-aka --enable-eap-identity --enable-md4
make
make install

我的 strongswan.conf 如下

charon {
       load_modular = yes

       plugins {

               include strongswan.d/charon/*.conf
       }
}

include strongswan.d/*.conf

我的伺服器端 swanctl.conf 如下

connections {
      server {
               pools = primary-pool-ipv4, primary-pool-ipv6
               local {
                       auth = pubkey
                       certs = <server_crt>
                       id = <server_id>
               }
               remote {
                       auth = eap-dynamic
                       id = %any
               }

               children {
                   client {

                   }
               }
       }
}


secrets {
       eap-test {
               id = <user_id>
               secret = <user_password>
       }
}


pools {
   primary-pool-ipv4 {
       addrs = 10.0.0.0/24
       dns = 8.8.8.8 
   }
   primary-pool-ipv6 {
       addrs = 2620:0:2d0:200::7/97

   }
}

伺服器以 root 身份使用以下命令啟動，並顯示這些結果

/custompath/strongroot/libexec/ipsec/charon &
/custompath/strongroot/sbin/swanctl -q


loaded certificate from '/custompath/strongroot/etc/swanctl/x509/<server_crt'
loaded certificate from '/custompath/strongroot/etc/swanctl/x509ca/<CA_crt>'
loaded rsa key from '/custompath/strongroot/etc/swanctl/private/<server_key>'
loaded eap secret 'eap-test'
no authorities found, 0 unloaded
loaded pool 'primary-pool-ipv4'
loaded pool 'primary-pool-ipv6'
successfully loaded 2 pools, 0 unloaded
loaded connection 'server'
successfully loaded 1 connections, 0 unloaded

和那些日誌

[CFG] loaded certificate 'C=FR, O=Test, CN=<server_id>'
[CFG] loaded certificate 'C=FR, O=Test, CN=Test CA'
[CFG] loaded RSA private key
[CFG] loaded EAP shared key with id 'eap-test' for: '<user_id>'
[CFG] added vici pool primary-pool-ipv4: 10.0.0.0, 254 entries
[CFG] added vici pool primary-pool-ipv6: 2620:0:2d0:200::7, 2147483640 entries
[CFG] added vici connection: server

在我的安卓手機上，我在我的 Strongswan 應用程序上使用了以下參數

Server : <server ipv4>
VPN Type : IKEv2 EAP (Username/Password)
Username : <user_id>
Password <user_password>

CA certificate : <CA_crt>

Server identity : <server_id>
Client identity : <user_id>

當我將客戶端登錄到伺服器時，我在伺服器上得到以下日誌：

[NET] <3> received packet: from  <client_ip>[33980] to   <server_ip>[500] (716 bytes)
[ENC] <3> parsed IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
[IKE] <3>  <client_ip> is initiating an IKE_SA
[CFG] <3> selected proposal: IKE:AES_CBC_128/HMAC_SHA2_256_128/PRF_AES128_XCBC/CURVE_25519
[IKE] <3> remote host is behind NAT
[IKE] <3> DH group ECP_256 unacceptable, requesting CURVE_25519
[ENC] <3> generating IKE_SA_INIT response 0 [ N(INVAL_KE) ]
[NET] <3> sending packet: from   <server_ip>[500] to  <client_ip>[33980] (38 bytes)
[NET] <4> received packet: from  <client_ip>[33980] to   <server_ip>[500] (684 bytes)
[ENC] <4> parsed IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
[IKE] <4>  <client_ip> is initiating an IKE_SA
[CFG] <4> selected proposal: IKE:AES_CBC_128/HMAC_SHA2_256_128/PRF_AES128_XCBC/CURVE_25519
[IKE] <4> remote host is behind NAT
[IKE] <4> sending cert request for "C=FR, O=Test, CN=Test CA"
[ENC] <4> generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ N(FRAG_SUP) N(HASH_ALG) N(CHDLESS_SUP) N(MULT_AUTH) ]
[NET] <4> sending packet: from   <server_ip>[500] to  <client_ip>[33980] (273 bytes)
[NET] <4> received packet: from  <client_ip>[51380] to   <server_ip>[4500] (480 bytes)
[ENC] <4> parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) CERTREQ IDr CPRQ(ADDR ADDR6 DNS DNS6) N(ESP_TFC_PAD_N) SA TSi TSr N(MOBIKE_SUP) N(NO_ADD_ADDR) N(MULT_AUTH) N(EAP_ONLY) N(MSG_ID_SYN_SUP) ]
[IKE] <4> received cert request for "C=FR, O=Test, CN=Test CA"
[CFG] <4> looking for peer configs matching   <server_ip>[<server_id>]... <client_ip>[<client_id>]
[CFG] <server|4> selected peer config 'server'
[IKE] <server|4> EAP_AKA method selected
[IKE] <server|4> initiating EAP_AKA method (id 0x11)
[IKE] <server|4> received ESP_TFC_PADDING_NOT_SUPPORTED, not using ESPv3 TFC padding
[IKE] <server|4> peer supports MOBIKE
[IKE] <server|4> authentication of '<server_id>' (myself) with RSA_EMSA_PKCS1_SHA2_256 successful
[IKE] <server|4> sending end entity cert "C=FR, O=Test, CN=<server_id>"
[ENC] <server|4> generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/AKA ]
[NET] <server|4> sending packet: from   <server_ip>[4500] to  <client_ip>[51380] (1184 bytes)
[NET] <server|4> received packet: from  <client_ip>[51380] to   <server_ip>[4500] (80 bytes)
[ENC] <server|4> parsed IKE_AUTH request 2 [ EAP/RES/NAK ]
[IKE] <server|4> received EAP_NAK, selecting a different EAP method
[IKE] <server|4> EAP_MSCHAPV2 method selected
[ENC] <server|4> generating IKE_AUTH response 2 [ EAP/REQ/MSCHAPV2 ]
[NET] <server|4> sending packet: from   <server_ip>[4500] to  <client_ip>[51380] (112 bytes)
[NET] <server|4> received packet: from  <client_ip>[51380] to   <server_ip>[4500] (144 bytes)
[ENC] <server|4> parsed IKE_AUTH request 3 [ EAP/RES/MSCHAPV2 ]
[ENC] <server|4> generating IKE_AUTH response 3 [ EAP/REQ/MSCHAPV2 ]
[NET] <server|4> sending packet: from   <server_ip>[4500] to  <client_ip>[51380] (144 bytes)
[NET] <server|4> received packet: from  <client_ip>[51380] to   <server_ip>[4500] (80 bytes)
[ENC] <server|4> parsed IKE_AUTH request 4 [ EAP/RES/MSCHAPV2 ]
[IKE] <server|4> EAP method EAP_MSCHAPV2 succeeded, MSK established
[ENC] <server|4> generating IKE_AUTH response 4 [ EAP/SUCC ]
[NET] <server|4> sending packet: from   <server_ip>[4500] to  <client_ip>[51380] (80 bytes)
[NET] <server|4> received packet: from  <client_ip>[51380] to   <server_ip>[4500] (96 bytes)
[ENC] <server|4> parsed IKE_AUTH request 5 [ AUTH ]
[IKE] <server|4> authentication of '<client_id>' with EAP successful
[IKE] <server|4> authentication of '<server_id>' (myself) with EAP
[IKE] <server|4> IKE_SA server[4] established between   <server_ip>[<server_id>]... <client_ip>[<client_id>]
[IKE] <server|4> scheduling rekeying in 13701s
[IKE] <server|4> maximum IKE_SA lifetime 15141s
[IKE] <server|4> peer requested virtual IP %any
[CFG] <server|4> reassigning offline lease to '<client_id>'
[IKE] <server|4> assigning virtual IP 10.0.0.1 to peer '<client_id>'
[IKE] <server|4> peer requested virtual IP %any6
[CFG] <server|4> reassigning offline lease to '<client_id>'
[IKE] <server|4> assigning virtual IP 2620:0:2d0:200::7 to peer '<client_id>'
[CFG] <server|4> selected proposal: ESP:AES_CBC_128/HMAC_SHA2_256_128/NO_EXT_SEQ
[JOB] watched FD 15 ready to read
[JOB] watcher going to poll() 3 fds
[JOB] watcher got notification, rebuilding
[JOB] watcher going to poll() 4 fds
[IKE] <server|4> CHILD_SA client{2} established with SPIs ce546f2f_i 58d283b4_o and TS   <server_ip>/32 === 10.0.0.1/32 2620:0:2d0:200::7/128
[ENC] <server|4> generating IKE_AUTH response 5 [ AUTH CPRP(ADDR ADDR6 DNS) SA TSi TSr N(MOBIKE_SUP) N(NO_ADD_ADDR) ]
[NET] <server|4> sending packet: from   <server_ip>[4500] to  <client_ip>[51380] (288 bytes)

那些在客戶端的日誌

[DMN] +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[DMN] Starting IKE service (strongSwan 5.8.4, Android 8.0.0 - R16NW.A520FXXSFCTG8/2020-08-01, SM-A520F - samsung/a5y17ltexx/samsung, Linux 3.18.14-13712092-QB33307948, aarch64)
[LIB] loaded plugins: androidbridge charon android-log openssl fips-prf random nonce pubkey chapoly curve25519 pkcs1 pkcs8 pem xcbc hmac socket-default revocation eap-identity eap-mschapv2 eap-md5 eap-gtc eap-tls x509
[JOB] spawning 16 worker threads
[IKE] initiating IKE_SA android[2] to <server_ip>
[ENC] generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
[NET] sending packet: from <client_internal_ip>[33980] to <server_ip>[500] (716 bytes)
[NET] received packet: from <server_ip>[500] to <client_internal_ip>[33980] (38 bytes)
[ENC] parsed IKE_SA_INIT response 0 [ N(INVAL_KE) ]
[IKE] peer didn't accept DH group ECP_256, it requested CURVE_25519
[IKE] initiating IKE_SA android[2] to <server_ip>
[ENC] generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
[NET] sending packet: from <client_internal_ip>[33980] to <server_ip>[500] (684 bytes)
[NET] received packet: from <server_ip>[500] to <client_internal_ip>[33980] (273 bytes)
[ENC] parsed IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ N(FRAG_SUP) N(HASH_ALG) N(CHDLESS_SUP) N(MULT_AUTH) ]
[CFG] selected proposal: IKE:AES_CBC_128/HMAC_SHA2_256_128/PRF_AES128_XCBC/CURVE_25519
[IKE] local host is behind NAT, sending keep alives
[IKE] received cert request for "C=FR, O=Test, CN=Test CA"
[IKE] sending cert request for "C=FR, O=Test, CN=Test CA"
[IKE] establishing CHILD_SA android{2}
[ENC] generating IKE_AUTH request 1 [ IDi N(INIT_CONTACT) CERTREQ IDr CPRQ(ADDR ADDR6 DNS DNS6) N(ESP_TFC_PAD_N) SA TSi TSr N(MOBIKE_SUP) N(NO_ADD_ADDR) N(MULT_AUTH) N(EAP_ONLY) N(MSG_ID_SYN_SUP) ]
[NET] sending packet: from <client_internal_ip>[51380] to <server_ip>[4500] (480 bytes)
[NET] received packet: from <server_ip>[4500] to <client_internal_ip>[51380] (1184 bytes)
[ENC] parsed IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/AKA ]
[IKE] received end entity cert "C=FR, O=Test, CN=<server_id>"
[CFG]   using certificate "C=FR, O=Test, CN=<server_id>"
[CFG]   using trusted ca certificate "C=FR, O=Test, CN=Test CA"
[CFG] checking certificate status of "C=FR, O=Test, CN=<server_id>"
[CFG] certificate status is not available
[CFG]   reached self-signed root ca with a path length of 0
[IKE] authentication of '<server_id>' with RSA_EMSA_PKCS1_SHA2_256 successful
[IKE] server requested EAP_AKA authentication (id 0x11)
[IKE] EAP method not supported, sending EAP_NAK
[ENC] generating IKE_AUTH request 2 [ EAP/RES/NAK ]
[NET] sending packet: from <client_internal_ip>[51380] to <server_ip>[4500] (80 bytes)
[NET] received packet: from <server_ip>[4500] to <client_internal_ip>[51380] (112 bytes)
[ENC] parsed IKE_AUTH response 2 [ EAP/REQ/MSCHAPV2 ]
[IKE] server requested EAP_MSCHAPV2 authentication (id 0x0F)
[ENC] generating IKE_AUTH request 3 [ EAP/RES/MSCHAPV2 ]
[NET] sending packet: from <client_internal_ip>[51380] to <server_ip>[4500] (144 bytes)
[NET] received packet: from <server_ip>[4500] to <client_internal_ip>[51380] (144 bytes)
[ENC] parsed IKE_AUTH response 3 [ EAP/REQ/MSCHAPV2 ]
[IKE] EAP-MS-CHAPv2 succeeded: 'Welcome2strongSwan'
[ENC] generating IKE_AUTH request 4 [ EAP/RES/MSCHAPV2 ]
[NET] sending packet: from <client_internal_ip>[51380] to <server_ip>[4500] (80 bytes)
[NET] received packet: from <server_ip>[4500] to <client_internal_ip>[51380] (80 bytes)
[ENC] parsed IKE_AUTH response 4 [ EAP/SUCC ]
[IKE] EAP method EAP_MSCHAPV2 succeeded, MSK established
[IKE] authentication of '<client_id>' (myself) with EAP
[ENC] generating IKE_AUTH request 5 [ AUTH ]
[NET] sending packet: from <client_internal_ip>[51380] to <server_ip>[4500] (96 bytes)
[NET] received packet: from <server_ip>[4500] to <client_internal_ip>[51380] (288 bytes)
[ENC] parsed IKE_AUTH response 5 [ AUTH CPRP(ADDR ADDR6 DNS) SA TSi TSr N(MOBIKE_SUP) N(NO_ADD_ADDR) ]
[IKE] authentication of '<server_id>' with EAP successful
[IKE] IKE_SA android[2] established between <client_internal_ip>[<client_id>]...<server_ip>[<server_id>]
[IKE] scheduling rekeying in 35866s
[IKE] maximum IKE_SA lifetime 37666s
[IKE] installing DNS server 8.8.8.8
[IKE] installing new virtual IP 10.0.0.1
[IKE] installing new virtual IP 2620:0:2d0:200::7
[CFG] selected proposal: ESP:AES_CBC_128/HMAC_SHA2_256_128/NO_EXT_SEQ
[IKE] CHILD_SA android{2} established with SPIs 58d283b4_i ce546f2f_o and TS 10.0.0.1/32 2620:0:2d0:200::7/128 === <server_ip>/32
[DMN] setting up TUN device for CHILD_SA android{2}
[DMN] successfully created TUN device
[IKE] peer supports MOBIKE

我收到隧道開通的通知。

我添加了一些 iptables 規則，用於基於此連結使用以下命令進行轉發https://wiki.strongswan.org/projects/strongswan/wiki/ForwardingAndSplitTunneling我只有 1 個伺服器網路介面（不包括環回），它將被命名為**<server_int>**

iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -o &lt;server_int&gt; -m policy --dir out --pol ipsec -j ACCEPT
iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -o &lt;server_int&gt; -j MASQUERADE
iptables -t nat -I POSTROUTING -m policy --pol ipsec --dir out -j ACCEPT

我還通過取消註釋以下行來啟動 ipv4（和 ipv6，如果它是正確的方式）的 ip 轉發/etc/sysctl.conf

net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1

然後使用sysctl -p /etc/sysctl.conf重新載入配置

但是，當我線上查看我的 IP 時，我發現我仍然獲得了客戶端公共 IP 而不是伺服器 IP。讓我相信 VPN 上沒有任何路由的原因是，當我啟動禁用 VPN 外部所有流量的選項時，我失去了與網際網路的所有連接（除了仍在執行的 VPN 連接）。但我沒有觸及拆分隧道，預設情況下應該將所有內容重定向到 VPN 隧道。

我在這裡錯過了哪一部分？

如果您想通過 VPN 隧道訪問多於伺服器，則必須在流量選擇器中指定。也就是說，更改子配置如下：

client {
   local_ts = 0.0.0.0/0,::/0
}

預設值是動態的，預設為 IP 地址（如果是客戶端，則為虛擬 IP），您可以在日誌中看到（例如在客戶端上為10.0.0.1/32 2620:0:2d0:200::7/128 === &lt;server_ip&gt;/32）。

引用自：https://serverfault.com/questions/1041122

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