web-dev-qa-db-ja.com

letsencrypt証明書を使用したStrongswan（IKEv2-EAP）

VPNクライアントが内部ネットワーク（EAP-IKEv2）にアクセスするように、Strongswanサーバーを構成しています。自己署名サーバー証明書を使用して正常に設定し、クライアントのルートCAに信頼済みとしてca.crtを追加した後、Mac OS X、Windows 7、およびWindows 10を使用するクライアントで機能します。

追加のクライアント側の構成なしに信頼できるはずのLetsencrypt証明書に切り替えたいのですが、なんらかの理由で動作しません。

サーバー：Ubuntu 18.04上のStrongswanバージョン5.6.2。クライアント：Mac OS X 10.14.2/Ubuntu 18.04/Windows 7/Windows 10

受け取ったMac OS X VPNエラーはThe VPN server did not respondです。 Mac OSにca.crtを追加せずに自己署名証明書と比較するために、User Authentication failedを受け取ります。

server.crtをクライアントにコピーすると、This certificate is validと表示されます。

Mac OSでDST ROOT CA X3証明書のIPセキュリティ（IPsec）をAlways trustおよびその他のLetsencrypt関連のCA証明書に設定しようとしましたが、役に立ちませんでした。

また、Always Trust証明書にserver.crtを適用しようとしましたが、まだうまくいきませんでした。

上記のすべてのOS（strongswan network-managerアプレットを使用するLinux）をテストしましたが、機能しませんでした。

Mac OSおよびWindowsから適切なデバッグログを取得できなかったため、ネットワークマネージャーアプレットなしでUbuntuを使用して他のサーバーにStrongswan clientを設定しました。クライアントでDST_Root_CA_X3.pem証明書を/etc/ssl/certsから/etc/ipsec.d/cacertsにコピーした後に機能し始めました。

3つの質問があります。

  1. Mac OSネイティブVPNクライアントからデバッグログを取得するにはどうすればよいですか？
  2. Strongswan VPNはLetsencrypt証明書でも動作しますか？ここで何が問題になるのでしょうか？
  3. 機能している可能性のある代替案をお勧めしますか？アライグマ、Openswan？ OpenVPNはプランBのままにしておきます。

以下にすべての詳細を示します。

手伝ってくれてありがとう。任意の入力をいただければ幸いです。

サーバ

$ certbot certonly --rsa-key-size 2048 --standalone --agree-tos --no-eff-email --email [email protected] -d vpn.company.com

$ cp /etc/letsencrypt/live/vpn.company.com/fullchain.pem /etc/ipsec.d/certs/server.crt
$ cp /etc/letsencrypt/live/vpn.company.com/privkey.pem /etc/ipsec.d/private/server.key

Strongswanはserver.crtにある最初の証明書のみを読み取ることを知っています。それでも、2番目のチェーン証明書を削除しても機能しません。 /etc/ipsec.d/cacertsまたは/ etc/ssl/certsからのその他のCA証明書にchain.pemを追加しようとしても機能しません。これは、サーバー上のCA証明書がクライアント認証に影響を与えないためです。 。

証明書をDERおよびPEM形式に変換することもテストしました。

PKI検証

$ ipsec pki --verify --in /etc/ipsec.d/certs/server.crt
no issuer certificate found for "CN=vpn.company.com"
  issuer is "C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"
  using trusted certificate "CN=vpn.company.com"
certificate trusted, lifetimes valid

証明書の詳細

$ openssl x509 -in certs/server.crt -noout -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            03:50:51:[...]
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
        Validity
            Not Before: Mar  1 13:40:42 2019 GMT
            Not After : May 30 13:40:42 2019 GMT
        Subject: CN = vpn.company.com
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:e3:a8:ea:8e:[...]
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment
            X509v3 Extended Key Usage:
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Subject Key Identifier:
                EC:6A:[...]
            X509v3 Authority Key Identifier:
                keyid:A8:4A:6A:[...]

            Authority Information Access:
                OCSP - URI:http://ocsp.int-x3.letsencrypt.org
                CA Issuers - URI:http://cert.int-x3.letsencrypt.org/

            X509v3 Subject Alternative Name:
                DNS:vpn.company.com
            X509v3 Certificate Policies:
                Policy: 2.23.140.1.2.1
                Policy: 1.3.6.1.4.1.44947.1.1.1
                  CPS: http://cps.letsencrypt.org

            CT Precertificate SCTs:
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 74:7E:DA:[...]
                    Timestamp : Mar  1 14:40:42.419 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:[...]
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 29:3C:51:[...]
                    Timestamp : Mar  1 14:40:42.499 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:46:02:[...]
    Signature Algorithm: sha256WithRSAEncryption
         8e:da:a3:[...]

ipsec.conf


config setup
  charondebug="dmn 1, mgr 1, ike 1, chd 1, job 1, cfg 1, knl 1, net 1, asn 1, enc 1, lib 1, esp 1, tls 1, tnc 1, imc 1, imv 1, pts 1"
    uniqueids=no

conn ikev2-vpn
    auto=add
    compress=no
    type=tunnel
    keyexchange=ikev2
    ike=aes256-sha1-modp1024
    esp=aes256-sha1
    fragmentation=no
    forceencaps=yes
    dpdaction=clear
    dpddelay=300s
    rekey=no
    left=%any
    [email protected]
  leftauth=pubkey
    leftcert=server.crt
    leftsendcert=always
    leftsubnet=0.0.0.0/0
  leftfirewall=yes
    right=%any
    rightid=%any
    rightauth=eap-mschapv2
    rightsourceip=10.255.255.0/24
    rightdns=1.1.1.1
    rightsendcert=never
    eap_identity=%identity

ipsec.secrets

vpn.company.com : RSA server.key
user %any% : EAP "user_password"

Strongswanサーバーログ

ipsec[11918]: Starting strongSwan 5.6.2 IPsec [starter]...
ipsec_starter[11918]: Starting strongSwan 5.6.2 IPsec [starter]...
charon[11943]: 00[DMN] Starting IKE charon daemon (strongSwan 5.6.2, Linux 4.15.0-45-generic, x86_64)
charon[11943]: 00[CFG] PKCS11 module '<name>' lacks library path
charon[11943]: 00[CFG] disabling load-tester plugin, not configured
charon[11943]: 00[LIB] plugin 'load-tester': failed to load - load_tester_plugin_create returned NULL
charon[11943]: 00[NET] could not open socket: Address family not supported by protocol
charon[11943]: 00[NET] could not open IPv6 socket, IPv6 disabled
charon[11943]: 00[KNL] received netlink error: Address family not supported by protocol (97)
charon[11943]: 00[KNL] unable to create IPv6 routing table rule
charon[11943]: 00[CFG] dnscert plugin is disabled
charon[11943]: 00[CFG] ipseckey plugin is disabled
charon[11943]: 00[CFG] attr-sql plugin: database URI not set
charon[11943]: 00[CFG] loading ca certificates from '/etc/ipsec.d/cacerts'
charon[11943]: 00[CFG] loading aa certificates from '/etc/ipsec.d/aacerts'
charon[11943]: 00[CFG] loading ocsp signer certificates from '/etc/ipsec.d/ocspcerts'
charon[11943]: 00[CFG] loading attribute certificates from '/etc/ipsec.d/acerts'
charon[11943]: 00[CFG] loading crls from '/etc/ipsec.d/crls'
charon[11943]: 00[CFG] loading secrets from '/etc/ipsec.secrets'
charon[11943]: 00[CFG]   loaded RSA private key from '/etc/ipsec.d/private/server.key'
charon[11943]: 00[CFG]   loaded EAP secret for USERNAME_HERE %any%
charon[11943]: 00[CFG] sql plugin: database URI not set
charon[11943]: 00[CFG] opening triplet file /etc/ipsec.d/triplets.dat failed: No such file or directory
charon[11943]: 00[CFG] eap-simaka-sql database URI missing
charon[11943]: 00[CFG] loaded 0 RADIUS server configurations
charon[11943]: 00[CFG] HA config misses local/remote address
charon[11943]: 00[CFG] no threshold configured for systime-fix, disabled
charon[11943]: 00[CFG] coupling file path unspecified
charon[11943]: 00[LIB] loaded plugins: charon test-vectors unbound ldap pkcs11 tpm aesni aes rc2 sha2 sha1 md4 md5 mgf1 rdrand random nonce x509 revocation constraints acert pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey dnscert ipseckey pem openssl gcrypt af-alg fips-prf gmp curve25519 agent chapoly xcbc cmac hmac ctr ccm gcm ntru bliss curl soup mysql sqlite attr kernel-netlink resolve socket-default connmark farp stroke updown eap-identity eap-sim eap-sim-pcsc eap-aka eap-aka-3gpp2 eap-simaka-pseudonym eap-simaka-reauth eap-md5 eap-gtc eap-mschapv2 eap-dynamic eap-radius eap-tls eap-ttls eap-peap eap-tnc xauth-generic xauth-eap xauth-pam xauth-noauth tnc-tnccs tnccs-20 tnccs-11 tnccs-dynamic dhcp whitelist lookip error-notify certexpire led radattr addrblock unity counters
charon[11943]: 00[LIB] dropped capabilities, running as uid 0, gid 0
charon[11943]: 00[JOB] spawning 16 worker threads
ipsec[11918]: charon (11943) started after 40 ms
ipsec_starter[11918]: charon (11943) started after 40 ms
charon[11943]: 06[CFG] received stroke: add connection 'ikev2-vpn'
charon[11943]: 06[CFG] adding virtual IP address pool 10.255.255.0/24
charon[11943]: 06[CFG]   loaded certificate "CN=vpn.company.com" from 'server.crt'
charon[11943]: 06[CFG] added configuration 'ikev2-vpn'
charon[11943]: 08[NET] received packet: from CLIENT_IP_HERE[44709] to SERVER_IP_HERE[500] (604 bytes)
charon[11943]: 08[ENC] parsed IKE_SA_INIT request 0 [ SA KE No N(REDIR_SUP) N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) ]
charon[11943]: 08[IKE] CLIENT_IP_HERE is initiating an IKE_SA
charon[11943]: 08[IKE] CLIENT_IP_HERE is initiating an IKE_SA
charon[11943]: 08[IKE] remote Host is behind NAT
charon[11943]: 08[ENC] generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(MULT_AUTH) ]
charon[11943]: 08[NET] sending packet: from SERVER_IP_HERE[500] to CLIENT_IP_HERE[44709] (440 bytes)
charon[11943]: 09[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
charon[11943]: 09[ENC] unknown attribute type (25)
charon[11943]: 09[ENC] parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) N(MOBIKE_SUP) IDr CPRQ(ADDR DHCP DNS MASK ADDR6 DHCP6 DNS6 (25)) N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) SA TSi TSr ]
charon[11943]: 09[CFG] looking for peer configs matching SERVER_IP_HERE[vpn.company.com]...CLIENT_IP_HERE[CLIENT_LOCAL_IP_HERE]
charon[11943]: 09[CFG] selected peer config 'ikev2-vpn'
charon[11943]: 09[IKE] initiating EAP_IDENTITY method (id 0x00)
charon[11943]: 09[IKE] received ESP_TFC_PADDING_NOT_SUPPORTED, not using ESPv3 TFC padding
charon[11943]: 09[IKE] peer supports MOBIKE
charon[11943]: 09[IKE] authentication of 'vpn.company.com' (myself) with RSA signature successful
charon[11943]: 09[IKE] sending end entity cert "CN=vpn.company.com"
charon[11943]: 09[ENC] generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
charon[11943]: 09[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)
charon[11943]: 10[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
charon[11943]: 10[ENC] unknown attribute type (25)
ipsec[11918]: 00[DMN] Starting IKE charon daemon (strongSwan 5.6.2, Linux 4.15.0-45-generic, x86_64)
ipsec[11918]: 00[CFG] PKCS11 module '<name>' lacks library path
ipsec[11918]: 00[CFG] disabling load-tester plugin, not configured
ipsec[11918]: 00[LIB] plugin 'load-tester': failed to load - load_tester_plugin_create returned NULL
ipsec[11918]: 00[NET] could not open socket: Address family not supported by protocol
ipsec[11918]: 00[NET] could not open IPv6 socket, IPv6 disabled
ipsec[11918]: 00[KNL] received netlink error: Address family not supported by protocol (97)
ipsec[11918]: 00[KNL] unable to create IPv6 routing table rule
ipsec[11918]: 00[CFG] dnscert plugin is disabled
ipsec[11918]: 00[CFG] ipseckey plugin is disabled
ipsec[11918]: 00[CFG] attr-sql plugin: database URI not set
ipsec[11918]: 00[CFG] loading ca certificates from '/etc/ipsec.d/cacerts'
ipsec[11918]: 00[CFG] loading aa certificates from '/etc/ipsec.d/aacerts'
ipsec[11918]: 00[CFG] loading ocsp signer certificates from '/etc/ipsec.d/ocspcerts'
ipsec[11918]: 00[CFG] loading attribute certificates from '/etc/ipsec.d/acerts'
ipsec[11918]: 00[CFG] loading crls from '/etc/ipsec.d/crls'
ipsec[11918]: 00[CFG] loading secrets from '/etc/ipsec.secrets'
ipsec[11918]: 00[CFG]   loaded RSA private key from '/etc/ipsec.d/private/server.key'
ipsec[11918]: 00[CFG]   loaded EAP secret for USERNAME_HERE %any%
ipsec[11918]: 00[CFG] sql plugin: database URI not set
ipsec[11918]: 00[CFG] opening triplet file /etc/ipsec.d/triplets.dat failed: No such file or directory
ipsec[11918]: 00[CFG] eap-simaka-sql database URI missing
ipsec[11918]: 00[CFG] loaded 0 RADIUS server configurations
ipsec[11918]: 00[CFG] HA config misses local/remote address
ipsec[11918]: 00[CFG] no threshold configured for systime-fix, disabled
ipsec[11918]: 00[CFG] coupling file path unspecified
charon[11943]: 10[ENC] parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) N(MOBIKE_SUP) IDr CPRQ(ADDR DHCP DNS MASK ADDR6 DHCP6 DNS6 (25)) N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) SA TSi TSr ]
ipsec[11918]: 00[LIB] loaded plugins: charon test-vectors unbound ldap pkcs11 tpm aesni aes rc2 sha2 sha1 md4 md5 mgf1 rdrand random nonce x509 revocation constraints acert pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey dnscert ipseckey pem openssl gcrypt af-alg fips-prf gmp curve25519 agent chapoly xcbc cmac hmac ctr ccm gcm ntru bliss curl soup mysql sqlite attr kernel-netlink resolve socket-default connmark farp stroke updown eap-identity eap-sim eap-sim-pcsc eap-aka eap-aka-3gpp2 eap-simaka-pseudonym eap-simaka-reauth eap-md5 eap-gtc eap-mschapv2 eap-dynamic eap-radius eap-tls eap-ttls eap-peap eap-tnc xauth-generic xauth-eap xauth-pam xauth-noauth tnc-tnccs tnccs-20 tnccs-11 tnccs-dynamic dhcp whitelist lookip error-notify certexpire led radattr addrblock unity counters
ipsec[11918]: 00[LIB] dropped capabilities, running as uid 0, gid 0
ipsec[11918]: 00[JOB] spawning 16 worker threads
ipsec[11918]: 06[CFG] received stroke: add connection 'ikev2-vpn'
ipsec[11918]: 06[CFG] adding virtual IP address pool 10.255.255.0/24
ipsec[11918]: 06[CFG]   loaded certificate "CN=vpn.company.com" from 'server.crt'
ipsec[11918]: 06[CFG] added configuration 'ikev2-vpn'
ipsec[11918]: 08[NET] received packet: from CLIENT_IP_HERE[44709] to SERVER_IP_HERE[500] (604 bytes)
ipsec[11918]: 08[ENC] parsed IKE_SA_INIT request 0 [ SA KE No N(REDIR_SUP) N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) ]
ipsec[11918]: 08[IKE] CLIENT_IP_HERE is initiating an IKE_SA
ipsec[11918]: 08[IKE] remote Host is behind NAT
ipsec[11918]: 08[ENC] generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(MULT_AUTH) ]
ipsec[11918]: 08[NET] sending packet: from SERVER_IP_HERE[500] to CLIENT_IP_HERE[44709] (440 bytes)
ipsec[11918]: 09[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
ipsec[11918]: 09[ENC] unknown attribute type (25)
ipsec[11918]: 09[ENC] parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) N(MOBIKE_SUP) IDr CPRQ(ADDR DHCP DNS MASK ADDR6 DHCP6 DNS6 (25)) N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) SA TSi TSr ]
ipsec[11918]: 09[CFG] looking for peer configs matching SERVER_IP_HERE[vpn.company.com]...CLIENT_IP_HERE[CLIENT_LOCAL_IP_HERE]
ipsec[11918]: 09[CFG] selected peer config 'ikev2-vpn'
ipsec[11918]: 09[IKE] initiating EAP_IDENTITY method (id 0x00)
charon[11943]: 10[IKE] received retransmit of request with ID 1, retransmitting response
ipsec[11918]: 09[IKE] received ESP_TFC_PADDING_NOT_SUPPORTED, not using ESPv3 TFC padding
ipsec[11918]: 09[IKE] peer supports MOBIKE
ipsec[11918]: 09[IKE] authentication of 'vpn.company.com' (myself) with RSA signature successful
ipsec[11918]: 09[IKE] sending end entity cert "CN=vpn.company.com"
ipsec[11918]: 09[ENC] generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
ipsec[11918]: 09[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)
ipsec[11918]: 10[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
ipsec[11918]: 10[ENC] unknown attribute type (25)
charon[11943]: 10[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)
charon[11943]: 11[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
charon[11943]: 11[ENC] unknown attribute type (25)
charon[11943]: 11[ENC] parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) N(MOBIKE_SUP) IDr CPRQ(ADDR DHCP DNS MASK ADDR6 DHCP6 DNS6 (25)) N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) SA TSi TSr ]
charon[11943]: 11[IKE] received retransmit of request with ID 1, retransmitting response
charon[11943]: 11[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)
charon[11943]: 12[NET] received packet: from CLIENT_IP_HERE[44710] to SERVER_IP_HERE[4500] (512 bytes)
charon[11943]: 12[ENC] unknown attribute type (25)
charon[11943]: 12[ENC] parsed IKE_AUTH request 1 [ IDi N(INIT_CONTACT) N(MOBIKE_SUP) IDr CPRQ(ADDR DHCP DNS MASK ADDR6 DHCP6 DNS6 (25)) N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) SA TSi TSr ]
charon[11943]: 12[IKE] received retransmit of request with ID 1, retransmitting response
charon[11943]: 12[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)

編集：断片化を有効にした後、Mac OSが機能し始めました。残念ながらWindows 10はエラーで終了します。 Windows 10から接続中のサーバーログ：

charon[12236]: 06[ENC] generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(MULT_AUTH) ]
charon[12236]: 06[NET] sending packet: from SERVER_IP_HERE[500] to CLIENT_IP_HERE[44742] (320 bytes)
charon[12236]: 09[NET] received packet: from CLIENT_IP_HERE[44743] to SERVER_IP_HERE[4500] (576 bytes)
charon[12236]: 09[ENC] parsed IKE_AUTH request 1 [ EF(1/2) ]
charon[12236]: 09[ENC] received fragment #1 of 2, waiting for complete IKE message
charon[12236]: 07[NET] received packet: from CLIENT_IP_HERE[44743] to SERVER_IP_HERE[4500] (368 bytes)
charon[12236]: 07[ENC] parsed IKE_AUTH request 1 [ EF(2/2) ]
charon[12236]: 07[ENC] received fragment #2 of 2, reassembling fragmented IKE message
charon[12236]: 07[ENC] parsed IKE_AUTH request 1 [ IDi CERTREQ CPRQ(ADDR DNS NBNS SRV) SA TSi TSr ]
charon[12236]: 07[IKE] received 27 cert requests for an unknown ca
charon[12236]: 07[CFG] looking for peer configs matching SERVER_IP_HERE[%any]...CLIENT_IP_HERE[CLIENT_LOCAL_IP_HERE]
charon[12236]: 07[CFG] selected peer config 'ikev2-vpn'
charon[12236]: 07[IKE] initiating EAP_IDENTITY method (id 0x00)
charon[12236]: 07[IKE] authentication of 'vpn.autouncle.com' (myself) with RSA signature successful
charon[12236]: 07[IKE] sending end entity cert "CN=vpn.autouncle.com"
charon[12236]: 07[ENC] generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
charon[12236]: 07[ENC] splitting IKE message with length of 1740 bytes into 2 fragments
charon[12236]: 07[ENC] generating IKE_AUTH response 1 [ EF(1/2) ]
charon[12236]: 07[ENC] generating IKE_AUTH response 1 [ EF(2/2) ]
charon[12236]: 07[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44743] (1248 bytes)
charon[12236]: 07[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44743] (560 bytes)
vpnmac-osxlets-encryptstrongswan
2
ahes

IPフラグメンテーションの問題である可能性があります。証明書により、IKE_AUTH応答がMTU（1744バイト）より大きい：

charon[11943]: 09[ENC] generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
charon[11943]: 09[NET] sending packet: from SERVER_IP_HERE[4500] to CLIENT_IP_HERE[44710] (1744 bytes)

したがって、これは複数のIPフラグメントに断片化されます。一部のルーターはこれらをドロップし、クライアントは完全なパケットを受信しない可能性があります。

幸い、クライアントはIKEv2フラグメンテーション（FRAG_SUP通知）：

charon[11943]: 08[NET] received packet: from CLIENT_IP_HERE[44709] to SERVER_IP_HERE[500] (604 bytes)
charon[11943]: 08[ENC] parsed IKE_SA_INIT request 0 [ SA KE No N(REDIR_SUP) N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) ]

したがって、サーバーでIKEv2フラグメンテーションを有効にしてみてください。つまり、fragmentationオプションを有効にするか、デフォルトで有効になっているので削除してください。

3
ecdsa

リーフ証明書に加えて、Letsencryptの中間証明書をインストールする必要があります。 chain.pemをipsec.d/cacertsに戻します

Strongswanログで確認したいのは、両方に送信することです。

charon：07 [IKE]送信エンドエンティティ証明書 "CN = vpn.example.com" charon：07 [IKE]発行者証明書 "C = US、O = Let's Encrypt、CN = Let's Encrypt Authority X3"

Windowsでは、PowerShellを使用してVPNエントリを作成および構成することを強くお勧めします。これにより、GUIが許可する以上のパラメーターを調整できます。例えば、

Add-VpnConnection -Name "My VPN" -ServerAddress vpn.example.com -TunnelType IKEv2 -AuthenticationMethod EAP -EncryptionLevel Maximum -RememberCredential:$True -SplitTunnel:$False -PassThru
Set-VpnConnectionIPsecConfiguration -ConnectionName "My VPN" -AuthenticationTransformConstants SHA256128 -CipherTransformConstants AES256 -EncryptionMethod AES256 -IntegrityCheckMethod SHA256 -DHGroup Group14 -PfsGroup Pfs2048 -PassThru -Force

ここのドキュメント： Add-VpnConnectionSet-VpnConnectionIPsecConfiguration

それでも何か問題がある場合は、Windowsイベントログを確認してください。 strongswan/letsencrypt証明書の設定で間違いなくうまく機能します。

1
fds