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Reply to topic   Topic: APACHE issue with RCA and ECC on systems

Joined: 21 Oct 2022
Posts: 4

PostPosted: Tue 29 Nov '22 8:55    Post subject: APACHE issue with RCA and ECC on systems Reply with quote

we are observing issue with Apache + ECC and Apache + RSA which are listed below

httpd configuration:

<VirtualHost *:443>
Header edit Set-Cookie (.*) "$1;Secure"
Header edit Set-Cookie ^((?!(siemens_automation_language|breadcrumb_autorefresh|sinema_DLS)).*)$ $1;HttpOnly;Secure
ServerAdmin sinema@localhost.com
ServerName "localhost"
SSLEngine on
SSLProxyEngine on
SecRuleEngine On
SSLCertificateFile ../SSLCertificates/server/cert.pem
SSLCertificateKeyFile ../SSLCertificates/server/key.pem
SSLCACertificateFile ../SSLCertificates/sinecnmsca/cacert.pem

in our application - 1 master and 100 slaves sending heartbeat every minute to the master (100 HB/min at master)

Apache with ECC :

Recently we had requirement to move to ECC - Apache + ECC certificate is used (curves namely secp256k1 or secp256r1 or secp384r1) . it works only for sometime and later the UI does not respond at all - issue is UI is very slow and later it throws error that the "localhost took time to respond" or "proxy error". In Apache error.log we could find below errors -

[Sat Nov 12 21:28:04.926797 2022] [socache_dbm:error] [pid 4280:tid 1092] (28)No space left on device: AH00808: Cannot store socache object to DBM file `C:/Apache24'

[Sat Nov 12 21:30:44.779314 2022] [mpm_winnt:error] [pid 4280:tid 2436] AH00326: Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting

[Mon Nov 14 07:22:54.300520 2022] [socache_dbm:error] [pid 4280:tid 1048] (28)No space left on device: AH00808: Cannot store socache object to DBM file `C:Apache24'

[Tue Nov 08 23:30:15.169189 2022] [proxy_http:error] [pid 8952:tid 1152] [client ::1:57555] AH01097: pass request body failed to [::1]:49115 (localhost) from ::1 ()

[Tue Nov 15 11:04:47.294809 2022] [proxy_http:error] [pid 8952:tid 1076] (70014)End of file found: [client ::1:54153] AH01102: error reading status line from remote server localhost:49115

We ran process monitor and started it on httpd process. after a while we see many socket CLOSE_WAIT leaks at Apache's end. which was not recovering on its own . Restart of apache was the only solution here

this issue of apache with ECC is observed while using tlsv1.2 as well as tlsv1.3

Apache with RSA :

when used with tlsv1.2
Apache + RSA certificate (key length 2048/3072)= works fine. No issues were observed for over 5 years

but when used with tlsv1.3
all the above mentioned issues for apache with ECC were observed here too.
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James Blond

Joined: 19 Jan 2006
Posts: 7169
Location: Germany, Next to Hamburg

PostPosted: Sun 04 Dec '22 0:05    Post subject: Reply with quote

I had the same issues with the curves. Current working config


<If "%{SERVER_PORT} == '443'">
    <IfModule mod_headers.c>
        Header always set Strict-Transport-Security "max-age=31536000; preload"
SSLUseStapling On
SSLSessionCache shmcb:C:/Windows/Temp/ssl_gcache_data(512000)
SSLStaplingCache shmcb:C:/Windows/Temp/ssl_stapling_data(512000)
SSLOptions +StrictRequire +StdEnvVars -ExportCertData
SSLProtocol -all +TLSv1.2 +TLSv1.3
SSLCompression Off
SSLHonorCipherOrder On
SSLCipherSuite TLSv1.3 TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384

SSLOpenSSLConfCmd ECDHParameters secp521r1
SSLOpenSSLConfCmd Curves secp521r1:secp384r1
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