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POUnable to get negotiate authentication to work in a libcurl program
 

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  1. POUnable to get negotiate authentication to work in a libcurl program
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    <p>I am currently using <code>libcurl(version 7.19.6 built with SPNEGO and GSS-Negotiate support)</code> to write a client(C++/C) which connects to a protected webpage(<code>Kerberos</code> protected) behind a Tomcat Server. Using the command line:-</p> <pre><code>curl --negotiate -u: http://prtotectedpage.jsp --verbose </code></pre> <p>this works(the server returns an an HTTP 401 unauthorized and then it allows for the <code>SPNEGO</code> tokens to be passed and processed and I get access to the protected page).</p> <p>However when I write the following code and try:- </p> <pre><code>using namespace std; #include &lt;stdio.h&gt; #include &lt;curl.h&gt; #define YOUR_URL "http://protectedpage.jsp" #define ANYUSER "" int main(int argc, char* argv[]) { __asm int 3; //a debugging thing //initialize a curl object CURLcode result; int x; CURL* curl = curl_easy_init(); if(curl){ curl_easy_setopt(curl,CURLOPT_HTTPAUTH, CURLAUTH_GSSNEGOTIATE); curl_easy_setopt(curl,CURLOPT_USERNAME, ANYUSER); curl_easy_setopt(curl,CURLOPT_VERBOSE, 1); curl_easy_setopt(curl, CURLOPT_URL,YOUR_URL); curl_easy_perform(curl); curl_easy_cleanup(curl); } return 0; } </code></pre> <p>I get response from server after initial connection(error 302) which corresponds to the page is temporarily moved. </p> <p>Does anyone know how this might happen.</p> <p>Some other configurations for information (<code>KDC = Windows Active Directory in Windows server 2008</code>), </p> <p><code>curl version(7.19.6)</code> and </p> <pre><code>IDE = (Microsoft visual studio) </code></pre> <p>Ok I have done a little more investigating with wireshark and I found the following differences between their initial requests:-</p> <p>For the command line one(i.e the successful one):-</p> <pre><code>GET /protected.jsp HTTP 1.1 \r\n Host : somecomputername User Agent: curl(7.19.6) (ipc-386-win32) libcurl/7.19.16 OPENSSL/0.9.8K \r\n Accept */*\r\n Full request: [http://somecomputername/protected.jsp] </code></pre> <p>Whereas for the client code(the one I wrote and failed):-</p> <pre><code>GET /protected.jsp HTTP 1.1 \r\n Host : somecomputername Accept */*\r\n Full request: [http://somecomputername/protected.jsp] </code></pre> <p>This would mean that the user agent is not passed in the program. I am still looking into it and some inputs would be much appreciated</p> <p>Second edit:- I made an observation on the verbose output of both:-</p> <p>For the command line version(working one) - </p> <pre><code>&gt; GET /examples/ HTTP/1.1 &gt; User-Agent: curl/7.19.6 (i386-pc-win32) libcurl/7.19.6 OpenSSL/0.9.8k &gt; Host: somecomputer &gt; Accept: */* </code></pre> <p>And for the non working one(the client code I wrote):-</p> <pre><code>&gt; GET /examples HTTP/1.1 Authorization: Basic RGt1bUByMTIzOg== User-Agent: curl/7.19.6 (i386-pc-win32) libcurl/7.19.6 OpenSSL/0.9.8k Host: somecomputer Accept: */* </code></pre> <p>Both of these are the first few lines of the output of the respective .exe files. Now I noticed two things. One the failed one goes to Basic by default. Two (this one is more disturbing), no arrows(>) in the Useragent and host lines in the failed one. Does this mean useragent is never sent?</p>
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    1. USArunav Sanyal
    1. USArunav Sanyal
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    1. COHave you compared request headers that your program sends with that of `curl`?
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    2. COyes, i have provided them in my edit(this was the first thing that came to my mind).
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    3. COTry sending some user agent string in your program, also tell curl not to send any (`-A ''`) and see what happens.
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