Christian not sure if you missed this as Gary had replied?

Gary, the key issue is this:

> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Executing operator "contains" with param "admin:" against 
> REQUEST_HEADERS:Authorization.
<snip>
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Rule returned 0.

So your rule is not matching for some reason. I would suggest you turn the 
audit engine on to capture all request:

SecAuditEngine On

And then see if this Authorization header is included, with a value containing 
admin, by looking in the audit log.

Alternatively write another rule that matches always:

 SecRule "REQUEST_URI" "." "phase:2,id:2,t:base64Decode,log,auditlog,allow"

And again check audit log to see if the Authorization header is included, with 
a value containing admin.

By the way phase 2 (REQUEST_BODY) also includes phase 1 (REQUEST_HEADER) 
details. You could move your rule to phase 1 and it will execute earlier which 
might save you needlessly attempting other phase 2 rules if it fails, but this 
is not the reason for your failure here.

Hope that helps.

Thanks,
Barry




----------------------------------------
> From: gary.mans...@ricardo.com
> To: csand...@trustwave.com; owasp-modsecurity-core-rule-set@lists.owasp.org
> Date: Mon, 4 Apr 2016 14:28:26 +0000
> Subject: Re: [Owasp-modsecurity-core-rule-set] Is it possible to use 
> modsecurity rules to prevent logins by specific user accounts?
>
> I have got some debug logs, but am not certain how what they are telling me - 
> I wonder if anyone can advise me on this?
>
> I have just the one rule in my config now:
>
> SecRule "REQUEST_HEADERS:Authorization" "@contains admin:" 
> "phase:2,log,auditlog,id:1,t:base64Decode,deny,status:403"
>
> I started a fresh apache session with empty debug log, and accessed the web 
> application from a fresh browser session (15:18:06) and was prompted to enter 
> username and password. I entered the username grmawcadmin and the password 
> and this shows at 15:18:07 in the log below.
>
> As far as I can see, it does not seem to run the rule in the REQUEST_HEADERS 
> section, but rather at the REQUEST_BODY - is this what is the problem - ie it 
> is checking for the admin string in the REQUEST_BODY rather than the 
> REQUEST_HEADER
>
> I would gladly appreciate some help on this, as I am rather stuck.
>
> Rgds
>
> Gary
>
>
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Initialising transaction (txid VwJ3nsCoAUcAABgZAbQAAACX).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][5]
>  Adding request cookie: name "__utma", value 
> "1.1672802757.1445242759.1445242759.1456313530.2"
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][5]
>  Adding request cookie: name "__utmz", value 
> "1.1445242759.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)"
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Transaction context created (dcfg 1039140).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Starting phase REQUEST_HEADERS.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Second phase starting (dcfg 1039140).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Input filter: This request does not have a body.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Starting phase REQUEST_BODY.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  This phase consists of 1 rule(s).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Recipe: Invoking rule 109b5e8; [file 
> "/opt/ptc/HTTPServer/conf/crs/ricardo.conf"] [line "11"] [id "1"].
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][5]
>  Rule 109b5e8: SecRule "REQUEST_HEADERS:Authorization" "@contains admin:" 
> "phase:2,log,auditlog,id:1,t:base64Decode,deny,status:403"
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Rule returned 0.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  No match, not chained -> mode NEXT_RULE.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Hook insert_filter: Adding output filter (r 7fc1ec0098b0).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0098b0).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Starting phase RESPONSE_HEADERS.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Content Injection: Not enabled.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 10 bytes.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0098b0).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 624 bytes.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0098b0).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 8 bytes.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  Output filter: Bucket type EOS contains 0 bytes.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Output filter: Completed receiving response body (buffered full - 642 bytes).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Starting phase RESPONSE_BODY.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Output filter: Output forwarding complete.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Initialising logging.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Starting phase LOGGING.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Recording persistent data took 0 microseconds.
> [04/Apr/2016:15:18:06 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0098b0][/Windchill/app/][4]
>  Audit log: Not configured to run for this request.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Initialising transaction (txid VwJ3qcCoAUcAABgZAbUAAACX).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][5]
>  Adding request cookie: name "__utma", value 
> "1.1672802757.1445242759.1445242759.1456313530.2"
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][5]
>  Adding request cookie: name "__utmz", value 
> "1.1445242759.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)"
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Transaction context created (dcfg 1039140).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Starting phase REQUEST_HEADERS.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Second phase starting (dcfg 1039140).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Input filter: This request does not have a body.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Starting phase REQUEST_BODY.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  This phase consists of 1 rule(s).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Recipe: Invoking rule 109b5e8; [file 
> "/opt/ptc/HTTPServer/conf/crs/ricardo.conf"] [line "11"] [id "1"].
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][5]
>  Rule 109b5e8: SecRule "REQUEST_HEADERS:Authorization" "@contains admin:" 
> "phase:2,log,auditlog,id:1,t:base64Decode,deny,status:403"
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  T (0) base64Decode: "\x05\xab""
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Transformation completed in 24 usec.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Executing operator "contains" with param "admin:" against 
> REQUEST_HEADERS:Authorization.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Target value: "\x05\xab""
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Operator completed in 7 usec.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Rule returned 0.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  No match, not chained -> mode NEXT_RULE.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Hook insert_filter: Adding output filter (r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Starting phase RESPONSE_HEADERS.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Content Injection: Not enabled.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 1591 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 1295 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type FLUSH contains 0 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 8184 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type TRANSIENT contains 129 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Receiving output (f 7fc1ec01d9e8, r 7fc1ec0340f0).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  Output filter: Bucket type EOS contains 0 bytes.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Output filter: Completed receiving response body (buffered full - 11199 
> bytes).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Starting phase RESPONSE_BODY.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Output filter: Output forwarding complete.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Initialising logging.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Starting phase LOGGING.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][9]
>  This phase consists of 0 rule(s).
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Recording persistent data took 0 microseconds.
> [04/Apr/2016:15:18:17 +0100] 
> [windchill-test.ricardo.com/sid#10af9e8][rid#7fc1ec0340f0][/Windchill/app/][4]
>  Audit log: Not configured to run for this request.
>
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Chaim Sanders [mailto:csand...@trustwave.com]
> Sent: 31 March 2016 17:33
> To: Mansell, Gary <gary.mans...@ricardo.com>; 
> owasp-modsecurity-core-rule-set@lists.owasp.org
> Subject: RE: [Owasp-modsecurity-core-rule-set] Is it possible to use 
> modsecurity rules to prevent logins by specific user accounts?
>
> Hey Gary,
> While I'm not sure what's going wrong with your rule I suggest you check out 
> the debug log... it will usually contain valuable information to help you 
> debug your issues :). Maybe someone else will be able to spot the issue.
>
> -----Original Message-----
> From: Mansell, Gary [mailto:gary.mans...@ricardo.com]
> Sent: Thursday, March 31, 2016 12:31 PM
> To: Chaim Sanders <csand...@trustwave.com>; 
> owasp-modsecurity-core-rule-set@lists.owasp.org
> Subject: Re: [Owasp-modsecurity-core-rule-set] Is it possible to use 
> modsecurity rules to prevent logins by specific user accounts?
>
> Is there no one who can help me further on this, as it seems exactly the sort 
> of thing that modsecurity should be able to do (but I am struggling with)?
>
> All of my Web Application admin accounts end in the string "admin", and I 
> would like to be able to use a modsecurity rule on the reverse proxy server 
> in the DMZ to prevent any admin logins (as admins should only ever login 
> directly via the internal apache server rather than the reverse proxy)?
>
> It is my understanding that even though this is a https request, as this 
> application uses basic authentication, every request via the reverse apache 
> server includes a base64 encoded username and password in the authorisation 
> header - I can't understand why I can't block this with a simple modsecurity 
> rule.
>
> The rule suggestion that I was sent by Chaim seems to make sense to me, but I 
> just can't get it to work - it seems to be looking to deny any request with 
> authorization Header containing the string "admin:"
>
> SecRule REQUEST_HEADERS:Authorization "@contains admin:" 
> "id:1,t:base64Decode,deny,status:403"
>
> Can anyone help me on this - is there just a simple typo in the rule perhaps? 
> Do I have to choose a unique ID value other than 1 (as I had the Owasp core 
> rule set configured too)?
>
> Rgds
>
> Gary
>
>
>
>
> I have had a good crack at trying to get this to work, but to no avail, 
> unfortunately.
>
> SecRule REQUEST_HEADERS:Authorization "@contains admin:" 
> "id:1,t:base64Decode,deny,status:403"
>
> I tried changing the contains string to various things that may be relevant, 
> but still no joy.
>
> Is it perhaps because both the reverse proxy and the internal apache server 
> are configured for https?
>
> How do I tell whether my system is using base64 to encode the username in the 
> header?
>
> I have to say I am completely lost with this now, it seems like something 
> that modsecurity should be able to do, but I don't know where to start with 
> debugging, or testing this to get it to work?
>
> Any ideas anyone?
>
> Rgds
>
> Gary
>
>
> -----Original Message-----
> From: Chaim Sanders [mailto:csand...@trustwave.com]
> Sent: 14 March 2016 15:58
> To: Mansell, Gary <gary.mans...@ricardo.com>; 
> owasp-modsecurity-core-rule-set@lists.owasp.org
> Subject: RE: [Owasp-modsecurity-core-rule-set] Is it possible to use 
> modsecurity rules to prevent logins by specific user accounts?
>
> Hey Gary,
> This Is actually a great question and should be very easily possible. 
> Typically Basic Authentication uses base64. So you could do something similar 
> to the following (untested) SecRule REQUEST_HEADERS:Authorization "@contains 
> admin:" "id:1, t:base64Decode,deny,status:403'
>
> -----Original Message-----
> From: owasp-modsecurity-core-rule-set-boun...@lists.owasp.org 
> [mailto:owasp-modsecurity-core-rule-set-boun...@lists.owasp.org] On Behalf Of 
> Mansell, Gary
> Sent: Monday, March 14, 2016 11:13 AM
> To: owasp-modsecurity-core-rule-set@lists.owasp.org
> Subject: [Owasp-modsecurity-core-rule-set] Is it possible to use modsecurity 
> rules to prevent logins by specific user accounts?
>
> Hi,
>
> I have an internal Web application that uses Apache Basic Authentication, 
> checking user account logins against an internal LDAP Server for 
> authentication.
>
> I am now looking to present this Web Application to whitelisted IP's on the 
> Internet, by means of a Reverse Proxy Apache Server in a DMZ with modsecurity 
> enabled and one of the free rulesets to protect the application being abused. 
> Both the Reverse Proxy and the Internal Apache server are configured for 
> https only.
>
> It occurs to me that Administrative users should never be able to login to 
> the Web Application from the via the Reverse Proxy Apache server - I hence 
> wonder if it is possible to use modsecurity on the Reverse Apache server to 
> prevent specific Admin user accounts from logging in to the Web Application?
>
> If so, please can someone point me in the direction of how I might achieve 
> this?
>
> Thanks
>
> Gary
>
>
>
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