帶有 RADIUS 的 Amazon Linux 上的 StrongSwan

我正在嘗試在具有針對 RADIUS 的身份驗證的 Amazon Linux 實例上執行 strongSwan，但在嘗試啟動 strongSwan 時收到錯誤消息

charon[9518]: 00[CFG] RADIUS initialization failed, HMAC/MD5/RNG required

安裝 strongSwan 我跑了

yum install strongswan

# swanctl --version strongSwan swanctl 5.7.1

# swanctl --stats loaded plugins: charon pkcs11 tpm aesni aes des rc2 sha2 sha1 md4 md5 mgf1 random nonce x509 revocation constraints acert pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem openssl gcrypt fips-prf gmp curve25519 chapoly xcbc cmac hmac ctr ccm gcm curl sqlite attr kernel-netlink resolve socket-default farp stroke vici updown eap-identity eap-sim eap-aka eap-aka-3gpp eap-aka-3gpp2 eap-md5 eap-gtc eap-mschapv2 eap-dynamic eap-radius eap-tls eap-ttls eap-peap xauth-generic xauth-eap xauth-pam xauth-noauth dhcp led duplicheck unity counters

cat <<EOF > /etc/strongswan/strongswan.d/charon/eap-radius.conf
eap-radius {
   load = yes
   nas_identifier = ${DNSNAME}
   retransmit_timeout = 30
   retransmit_tries = 1
   servers {
       primary {
           preference = 99
           address = ${RADIUSFQDN}
           auth_port = 1812
           secret = ${RADIUSPSWD}
           sockets = 5
       }
   }
}
EOF

完整的啟動日誌

Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 06[MGR] tried to checkin and delete nonexisting IKE_SA
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 06[IKE] unable to resolve %any, initiate aborted
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 06[CFG] received stroke: initiate 'pod'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 05[CFG] added configuration 'pod'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 05[CFG]   loaded certificate "CN=vpn.test.dev.poddev.naimuri.uk" from 'vpnserver.crt'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 05[CFG] adding virtual IP address pool 192.168.250.0/24
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 05[CFG] received stroke: add connection 'pod'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal strongswan[10484]: charon (10493) started after 60 ms
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal ipsec_starter[10484]: charon (10493) started after 60 ms
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[JOB] spawning 16 worker threads
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[LIB] loaded plugins: charon pkcs11 tpm aesni aes des rc2 sha2 sha1 md4 md5 mgf1 random nonce x509 revocation const
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] no script for ext-auth script defined, disabled
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] HA config misses local/remote address
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loaded 0 RADIUS server configurations
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading RADIUS server 'primary' failed, skipped
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] RADIUS initialization failed, HMAC/MD5/RNG required
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] opening triplet file /etc/strongswan/ipsec.d/triplets.dat failed: No such file or directory
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] sql plugin: database URI not set
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG]   loaded RSA private key from '/etc/strongswan/ipsec.d/private/vpnserver.key'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading secrets from '/etc/strongswan/ipsec.secrets'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading crls from '/etc/strongswan/ipsec.d/crls'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading attribute certificates from '/etc/strongswan/ipsec.d/acerts'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading ocsp signer certificates from '/etc/strongswan/ipsec.d/ocspcerts'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading aa certificates from '/etc/strongswan/ipsec.d/aacerts'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG]   loaded ca certificate "C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3" from '/etc/strongswan/ipsec.d/
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] loading ca certificates from '/etc/strongswan/ipsec.d/cacerts'
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[LIB] openssl FIPS mode(2) - enabled
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[CFG] PKCS11 module '<name>' lacks library path
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal charon[10493]: 00[DMN] Starting IKE charon daemon (strongSwan 5.7.1, Linux 4.14.72-73.55.amzn2.x86_64, x86_64)
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal ipsec_starter[10484]: Starting strongSwan 5.7.1 IPsec [starter]...
Nov 13 14:14:34 ip-10-0-0-218.eu-west-2.compute.internal strongswan[10484]: Starting strongSwan 5.7.1 IPsec [starter]...

問題是您在 FIPS 模式下使用 OpenSSL，這會禁用 MD5，因為它未經 FIPS 批准。

雖然您確實同時載入了md5和hmac外掛，但後者在openssl外掛之後排序，它仍然註冊自己的HMAC_MD5_128. 這個實現甚至可以被實例化，因為外掛的 HMAC 建構子實際上只檢查是否存在EVP_MD給定雜湊算法的靜態實例，不幸的是，即使在 FIPS 模式下，MD5 也是如此。但是，HMAC_INIT_ex()稍後使用該實例會失敗（觸發錯誤的原因是嘗試在 HMAC 實例上設置密鑰）。

為避免這種情況，您可以禁用 FIPS 模式（通過charon.plugins.openssl.fips_mode），或者確保使用hmac外掛提供的 HMAC 實現而不是openssl外掛的實現。

後者可以通過在它們各自的配置片段中修改這些外掛中的任何一個的載入/etc/strongswan/strongswan.d/charon設置來實現，以便降級openssl外掛（將其設置為負數值），或通過提升hmac外掛（將其設置為值 > 1)。重啟後，看到的外掛順序swanctl --stats應該相應改變，輸出swanctl --list-algs應該顯示hmac外掛正在提供HMAC_MD5_128.

引用自：https://serverfault.com/questions/939793