Gateway Proxy failure - but only with one browser ...

["Walter H." <Walter.H@xxxxxxxxxxxxxxxxx>]

I have two squids,

one does SSL bump (3.5latest CentOS 6)
the other doesn't SSL bump (3.4latest CentOS 6)

everything works,

I have a site that uses SSL/TLS, and two different browsers (one in a VM 
with old windows),

when I use the squid without SSL bump, the site works with both browsers,

but when I use the squid with SSL bump, with the old browser I get a 
"Gateway Proxy failure"

the log shows this:

host - - [29/Apr/2020:19:04:11 +0200] "CONNECT ssl.mathemainzel.info:443 
HTTP/1.1" 200 0 "-" "Mozilla/5.0 (Windows; U; WinNT4.0; en-US; 
rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20" TAG_NONE:HIER_DIRECT 
SNI:ssl.mathemainzel.info
host - - [29/Apr/2020:19:04:11 +0200] "GET 
https://ssl.mathemainzel.info/sslinfo/ HTTP/1.1" 500 1679 "-" 
"Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.8.1.20) Gecko/20081217 
Firefox/2.0.0.20" TAG_NONE:HIER_NONE SNI:ssl.mathemainzel.info

in compare to the log when using the other browser ...

host - - [29/Apr/2020:19:05:53 +0200] "CONNECT ssl.mathemainzel.info:443 
HTTP/1.1" 200 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.9) 
Goanna/4.5 PaleMoon/28.9.1" TAG_NONE:HIER_DIRECT SNI:ssl.mathemainzel.info
host - - [29/Apr/2020:19:05:53 +0200] "GET 
https://ssl.mathemainzel.info/sslinfo/ HTTP/1.1" 200 1977 
"https://ssl.mathemainzel.info/"; "Mozilla/5.0 (Windows NT 10.0; Win64; 
x64; rv:68.9) Goanna/4.5 PaleMoon/28.9.1" TCP_MISS:HIER_DIRECT 
SNI:ssl.mathemainzel.info

is this caused by the browser on old OS itself?

squid.conf (of squid with SSL bump)

reply_header_access Public-Key-Pins deny all

reply_header_access Strict-Transport-Security deny all
reply_header_replace Strict-Transport-Security max-age=0; includeSubDomains

acl step1 at_step SslBump1
acl step2 at_step SslBump2
acl step3 at_step SslBump3
acl nobumpsites ssl::server_name "/etc/squid/sslnobumpsites-acl.squid"

ssl_bump peek step1
ssl_bump splice nobumpsites
ssl_bump stare step2
ssl_bump bump all

sslproxy_cafile /etc/squid/ca-bundle.trust.crt
sslproxy_cipher 
EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA:EECDH:EDH+AESGCM:EDH:ECDH+AESGCM:ECDH+AES:ECDH:AES:HIGH:MEDIUM:!SSLv2:+SSLv3:!3DES:!RC4:!MD5:!IDEA:!SEED:!aNULL:!eNULL:!LOW:!EXP:!DSS:!PSK:!RSA:!SRP
sslproxy_flags DONT_VERIFY_PEER,NO_DEFAULT_CA
sslproxy_options NO_SSLv2,NO_SSLv3,SINGLE_DH_USE,SINGLE_ECDH_USE

sslcrtd_program /usr/lib64/squid/ssl_crtd -s /var/local/squid/ssl_db -M 16MB
sslcrtd_children 8

http_port 3128 ssl-bump generate-host-certificates=on 
dynamic_cert_mem_cache_size=16MB cert=/etc/squid/cert/squidCA.pem 
options=NO_SSLv2,NO_SSLv3


Thanks,
Walter

<<attachment: smime.p7s>>

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