Unable to use libcurl to access a site requiring client authentication Post: 302525007

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Top Forums Programming Unable to use libcurl to access a site requiring client authentication Post 302525007 by old_as_a_fossil on Wednesday 25th of May 2011 10:23:29 AM

05-25-2011

Registered User

Unable to use libcurl to access a site requiring client authentication

I’m using the below snipped for setting the certificate and key for client authentication.

Code:

 curl_easy_setopt(curl,CURLOPT_SSLCERT,"clientCert.pem");
curl_easy_setopt(curl,CURLOPT_SSLCERTPASSWD,"changeit"); 
curl_easy_setopt(curl,CURLOPT_SSLCERTTYPE,"PEM"); 
curl_easy_setopt(curl,CURLOPT_SSLKEY,"privateKey.pem"); 
curl_easy_setopt(curl,CURLOPT_SSLKEYPASSWD,"changeit"); 
curl_easy_setopt(curl,CURLOPT_SSLKEYTYPE,"PEM");

The certificate doesn’t have a password, I don’t know why on earth the option SSLCERTPASSWD exists, I just provided a dummy value. When I run the program on Linux I get an error code of 58 and an error message unable to set private key file: 'privateKey.pem' type PEMOn Windows however I get unable to use client certificate (no key found or wrong pass phrase?)
It seems to suggest the certificate and the key don’t match but I don’t know how. I have extracted both the cert and the key from a p12 file using openssl commands. The command I used to extract the key is
openssl.exe pkcs12 -in client.p12 -nocerts -out privateKey.pem
and the command used to extract the cert is
openssl.exe pkcs12 -in client.p12 -nokeys -out clientCert.pem

The p12 file has been successfully used in a browser to access the client authentication url. Please help before I shoot myself.

Last edited by old_as_a_fossil; 05-25-2011 at 11:32 AM..

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curlopt_proxy_sslcert

CURLOPT_PROXY_SSLCERT(3)				     curl_easy_setopt options					  CURLOPT_PROXY_SSLCERT(3)

NAME

       CURLOPT_PROXY_SSLCERT - set SSL proxy client certificate

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT, char *cert);

DESCRIPTION

       This option is for connecting to a HTTPS proxy, not a HTTPS server.

       Pass  a	pointer to a zero terminated string as parameter. The string should be the file name of your client certificate used to connect to
       the HTTPS proxy.  The default  format  is  "P12"  on  Secure  Transport	and  "PEM"  on	other  engines,  and  can  be  changed	with  CUR-
       LOPT_PROXY_SSLCERTTYPE(3).

       With NSS or Secure Transport, this can also be the nickname of the certificate you wish to authenticate with as it is named in the security
       database. If you want to use a file from the current directory, please precede it with "./" prefix, in order  to  avoid	confusion  with  a
       nickname.

       When using a client certificate, you most likely also need to provide a private key with CURLOPT_PROXY_SSLKEY(3).

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       Used with HTTPS proxy

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.52.0

RETURN VALUE

       Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO

       CURLOPT_PROXY_SSLCERTTYPE(3), CURLOPT_PROXY_SSLKEY(3), CURLOPT_SSLCERT(3),

libcurl 7.54.0							 December 21, 2016					  CURLOPT_PROXY_SSLCERT(3)