gmer3.itd.sterling.com/home.htm in the access log
Thomas Ward
teward at thomas-ward.net
Thu Jun 3 20:01:49 UTC 2021
Let's dissect an HTTP request that is sent to your NGINX server.
Assume for a moment it's '/cr-bin/mp.exe' that's the request but there's
extra headers. The full HTTP request looks like this (CURL format
output, but also what NGINX spits in debug mode):
POST /cr-bin/mp.exe
referer: example.com/foobar.html
content-type: text/json
content-length: 2345
The actual URL request in this case would have been
http://your-nginx-server/cr-bin/mp.exe with a POST to there, and that is
passed through to your system per your proxy_pass rules, etc.
Where your logs are getting "gmer3.itd.sterling.com/home.htm" is from
that *referer* header. I.E. you would see "example.com/foobar.html" if
the referer header in the request was the example above.
This has **nothing** to do with your configuration. Whatever 'poster'
is doing to post the items to your system is passing a referer header in
the POST with the contents "gmer3.itd.sterling.com/home.htm". If this
is some other site/system you'll see any number of potential referer
items. It's also entirely possible that this is your hostname, or
something specific to your Poster program itself setting the referer
header in the POST that it sends to your server.
This, again, has nothing to do with your NGINX configuration and
everything with how Poster is structuring the POST request (including
any headers it's sending in the request).
Thomas
On 6/3/21 2:52 PM, Benn Boulton wrote:
>
> Hi,
>
> Currently… The posts are coming from the same computer that is
> hosting NGINX that passes the requests to an external server.
>
> Eventually… NGINX will be run on the same computer with Apache and
> will also function as a load balancer for multiple servers. One being
> the same as NGINX and other external servers.
>
> The posts are from a custom poster process that is an .EXE run from
> the windows command prompt or a process that calls the POSTER executable.
>
> C:\POSTER> Poster h:http://localhost/cr-bin/mp.exe f:test.txt
>
> h: is the host to send to
>
> f: is the file with the payload to be sent to the final destination
> which is the mp.exe on the server listed in the proxy_pass parameter.
>
> Everything looks to work as it should. But the
> ‘gmer3.itd.sterling.com/home.htm’ Log entries are just not what I
> expect to see.
>
> I am installing NGINX to rate limit a customer that is sending
> multiple posts so fast that we occasionally miss one, and hope this
> will resolve that.
>
> Again, the proxy redirect is working, just the log entries is what
> prompted my asking.
>
> Thanks,
>
> - Benn
>
> *From:* nginx <nginx-bounces at nginx.org> *On Behalf Of *Moshe Katz
> *Sent:* Thursday, June 3, 2021 1:29 PM
> *To:* nginx at nginx.org
> *Subject:* Re: gmer3.itd.sterling.com/home.htm in the access log
>
> Benn,
>
> I guess my explanation wasn't clear enough, so I'll try again.
>
> That value is not coming from anywhere in your server's configuration
> - it has nothing to do with proxy_pass or anything else. It is the
> value of the "Referer" header that is in the incoming request.
>
> First, are these log lines from requests that you are making to the
> server yourself, or are they coming from someone else?
>
> If it is your own traffic, where are you making your requests from? Is
> it a page in a web browser, or is it some other tool?
>
> If it is a web browser, that is usually the URL of the web page that
> is open in the browser. For example, if I have a website at
> `example.com/page.html`
> <https://url.emailprotection.link/?bDBb9TVOKiqDPh_SUvfalWM90G6wcWScPnK_EVq6xVxh-Jq5ndDGgvfcC5U_tqxpluRe5jF35zSgN416HI1RIHw~~>
> with a form on it that submits to your server, the value in that place
> in the logs will be `https://example.com/page.html`
> <https://url.emailprotection.link/?bMe1AJs-bSscT1yazCR9XS0kzX52Qa1-DwoIBV-QK8xxhHB1slVsgthl_uC3ltg7Vu05wQoXQi9lo9go4OQWCbA~~>
> so that your server can see where the request came from.
>
> Moshe
>
> On Thu, Jun 3, 2021 at 1:18 PM Benn Boulton
> <bboulton at skippingstone.com <mailto:bboulton at skippingstone.com>> wrote:
>
> Hello Moshe,
>
> Thanks for the reply. I guess I was not clear enough in my post.
> I know the /cr-bin/mp.exe is part of the POST request.
>
> What I do not understand is where the
> gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>
> is coming from. It is not my proxy_pass value.
>
> It is not part of the POST request or part of the nginx proxy_pass
> or any thing I can find in my configuration.
>
> Is my post being sent to both my proxy_pass value and this site in
> the log? Do I have a hacked nginx?
>
> -Benn
>
> *From:* nginx <nginx-bounces at nginx.org
> <mailto:nginx-bounces at nginx.org>> *On Behalf Of *Moshe Katz
> *Sent:* Thursday, June 3, 2021 12:14 PM
> *To:* nginx at nginx.org <mailto:nginx at nginx.org>
> *Subject:* Re: gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>
> in the access log
>
> Benn,
>
> That part of the log is not the request URL, it is the
> referrer header. The path that was requested on your server is
> before that - a POST request to "/cr-bin/mp.exe". The
> referrer (which the HTTP standard actually misspells as
> "referer") is the web page that is making this request to your server.
>
> Moshe
>
> On Thu, Jun 3, 2021 at 12:08 PM Benn Boulton
> <bboulton at skippingstone.com <mailto:bboulton at skippingstone.com>>
> wrote:
>
> Hello,
>
> I have just installed the NGINX service to help rate limit
> connections to my Apache server on Windows.
>
> NGNIX 1.19.10 on Windows 10 64 bit
>
> Everything seems to be working fine but I am getting access
> log entries that I do not understand for the pages I am
> redirecting.
>
> I am running a process that posts to the server. NGNIX is
> processing the request and passing it to the destination
> server but it is not gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>
> as shown in the access log entries below.
>
> Any Idea why
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:30:07 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:31:07 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:33:35 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:37:42 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:55:03 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> 127.0.0.1 - t_skipstone [03/Jun/2021:10:56:34 -0400] "POST
> /cr-bin/mp.exe HTTP/1.1" 200 569
> "gmer3.itd.sterling.com/home.htm
> <https://url.emailprotection.link/?bD5H3QzZ3V5r-EeQ1owgpRQF9oV5l2NRIm985JaimcuSK9Ouf7HkyYPBjb_5XEDTDFQOhTH2rYvU2h1CLfmBEfM8_cgt7-mqSW8-5oZbZzhsOjFEa1jMAMRarOyYb8wct>"
> "brow v1.0 CCI"
>
> Thanks
>
> *Benn *
>
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