Re: NTLM authentication problems with HTTP 1.1

[brendan kearney <bpk678@xxxxxxxxx>]

Note the lack of a user-agent string.  This is likely an app that cannot authenticate.

My standard for Auth Bypass is source IP, user-agent string and destination URL.  Generally the source is preferred to be statically assigned otherwise you need to allow the entire dhcp pool or range.  Because there is no user-agent you can drop the requirement or force it with some sort of negated logic (!any)

On Apr 8, 2015 11:21 AM, "Samuel Anderson" <sam@xxxxxxxxxx> wrote:

Hello all,

I'm having a problem where HTTP 1.1 connect requests do not authenticate using NTLM. Browsing the internet works fine in all major browsers, I mostly see this occurring in programs that are installed locally on a users computer. Using wireshark I'm able to follow the TCP stream and I can see that the server returns the error (407 Proxy Authentication Required). I am able to work around this problem by explicitly bypassing a domain from requiring authentication, however I really don't want to do that. Any ideas would be appreciated very much.

Thanks,

Below is the content summery of some of the network packets that I'm working with along with my config file

TCP Stream Content

####################

CONNECT batch.internetpostage.com:443 HTTP/1.1

Host: batch.internetpostage.com

Proxy-Connection: Keep-Alive

HTTP/1.1 407 Proxy Authentication Required

Server: squid/3.3.8

Mime-Version: 1.0

Date: Tue, 07 Apr 2015 21:02:24 GMT

Content-Type: text/html

Content-Length: 3208

X-Squid-Error: ERR_CACHE_ACCESS_DENIED 0

Proxy-Authenticate: Negotiate

Proxy-Authenticate: NTLM

X-Cache: MISS from squid2.****.local

X-Cache-Lookup: NONE from squid2.****.local:3128

Via: 1.1 squid2.****.local (squid/3.3.8)

Connection: close

####################

CONFIG File

####################

#Kerberos and NTLM authentication

auth_param negotiate program /usr/local/bin/negotiate_wrapper --ntlm /usr/bin/ntlm_auth --diagnostics --helper-protocol=squid-2.5-ntlmssp --domain=****.LOCAL --kerberos /usr/lib/squid3/negotiate_kerberos_auth -d -s GSS_C_NO_NAME

auth_param negotiate children 30

auth_param negotiate keep_alive off

auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp --domain=****

auth_param ntlm children 30

auth_param ntlm keep_alive off

# AD group membership lookup

external_acl_type ldap_group ttl=60 children-startup=10 children-max=50 children-idle=2 %LOGIN /usr/lib/squid3/ext_ldap_group_acl -R -K -S -b "DC=****,DC=local" -D "CN=SQUID,OU=**** Service Accounts,DC=****,DC=local" -w "****" -f "(&(objectclass=person) (sAMAccountname=%v)(memberof=CN=%a,OU=PROXY,ou=ALL **** Groups,DC=**** ,DC=local))" -h dc1.****.local,dc2.****.local,dc3.****.local,dc4.****.local

# auth required

acl auth proxy_auth REQUIRED

http_access deny !auth all

####################

--

Samuel Anderson  |  Information Technology Administrator  |  International Document Services

IDS  |  11629 South 700 East, Suite 200  |  Draper, UT 84020-4607

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