[squid-users] squid 4.1 transparent https issue "curl: (60) SSL certificate problem: self signed certificate in certificate chain"

Wed Nov 20 08:31:04 UTC 2019

Hello,
I want to start saying I'm new working with squid so bear with me. We are at my company trying to use squid as egress solution for our servers running in AWS.
We need to have a whitelisting function in place.

HTTP works fine but not HTTPS.

When trying to run curl from another server using squid to access internet we receive this message:
 #curl https://microsoft.com
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

When checking the squid cache log file this is showing:

# tail -f /var/log/squid/cache.log
2019/11/20 08:25:01 kid1| HTCP Disabled.
2019/11/20 08:25:01 kid1| Squid plugin modules loaded: 0
2019/11/20 08:25:01 kid1| Adaptation support is off.
2019/11/20 08:25:01 kid1| Accepting HTTP Socket connections at local=[::]:3128 remote=[::] FD 23 flags=9
2019/11/20 08:25:01 kid1| Accepting NAT intercepted HTTP Socket connections at local=[::]:3129 remote=[::] FD 24 flags=41
2019/11/20 08:25:01 kid1| Accepting NAT intercepted SSL bumped HTTPS Socket connections at local=[::]:3130 remote=[::] FD 25 flags=41
2019/11/20 08:25:02 kid1| storeLateRelease: released 0 objects
security_file_certgen helper database '/var/spool/squid/ssl_db' failed: Failed to open file /var/spool/squid/ssl_db/index.txt
2019/11/20 08:25:10 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)
2019/11/20 08:25:12 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)
2019/11/20 08:25:14 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)
2019/11/20 08:25:19 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)
2019/11/20 08:25:19 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)
2019/11/20 08:25:20 kid1| Error negotiating SSL connection on FD 12: error:00000001:lib(0):func(0):reason(1) (1/0)

The squid.conf looks like this:

#acl localnet src 10.0.0.0/8
visible_hostname centos-squid-4.1

acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT

acl allowed_http_sites dstdomain .microsoft.com
acl allowed_http_sites dstdomain .google.com
acl allowed_http_sites dstdomain .redhat.com

http_access allow allowed_http_sites Safe_ports
http_port 3128
http_port 3129 intercept

#SSL Settings
acl allowed_https_sites dstdomain .microsoft.com

http_access allow CONNECT allowed_https_sites
options=SINGLE_DH_USE,SINGLE_ECDH_USE tls-dh=/etc/squid/dhparam.pem
https_port 3130 intercept ssl-bump generate-host-certificates=on cert=/etc/squid/fredrik_cert/squid.pem key=/etc/squid/fredrik_cert/squid.key options=SINGLE_DH_USE,SINGLE_ECDH_USE tls-dh=/etc/squid/dhparam
.pem

# And finally deny all other access to this proxy
http_access deny all
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

#
# Add any of your own refresh_pattern entries above these.
#
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
#refresh_pattern .

acl step1 at_step SslBump1
acl step2 at_step SslBump2
acl step3 at_step SslBump3
ssl_bump peek step1 all
ssl_bump peek step2 allowed_https_sites
ssl_bump splice step2 allowed_https_sites
ssl_bump splice step3 allowed_https_sites
ssl_bump terminate step2 all

cache_mem 1024 MB
sslcrtd_program /usr/lib64/squid/security_file_certgen -s /var/spool/squid/ssl_db -M 16MB
sslcrtd_children 10
ssl_bump bump all

Please assist me!
Nick

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