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https://github.com/moparisthebest/curl
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CURLOPT_SSL_CTX_FUNCTION.3: added example
and removed erroneous reference to test case lib509
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@ -5,7 +5,7 @@
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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@ -50,18 +50,87 @@ callback's error code. Set the \fIuserptr\fP argument with the
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This function will get called on all new connections made to a server, during
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the SSL negotiation. The SSL_CTX pointer will be a new one every time.
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To use this properly, a non-trivial amount of knowledge of your SSL library
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is necessary. For example, you can use this function to call library-specific
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To use this properly, a non-trivial amount of knowledge of your SSL library is
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necessary. For example, you can use this function to call library-specific
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callbacks to add additional validation code for certificates, and even to
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change the actual URI of a HTTPS request (example used in the lib509 test
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case). See also the example section for a replacement of the key, certificate
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and trust file settings.
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change the actual URI of a HTTPS request.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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.SH EXAMPLE
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TODO
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/* OpenSSL specific */
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#include <openssl/ssl.h>
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#include <curl/curl.h>
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#include <stdio.h>
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static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
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{
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X509_STORE *store;
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X509 *cert=NULL;
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BIO *bio;
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char *mypem = /* example CA cert PEM - shortened */
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"-----BEGIN CERTIFICATE-----\n"
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"MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"
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"IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"
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"IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"
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"Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"
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"GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"
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"zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"
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"omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
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"-----END CERTIFICATE-----\n";
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/* get a BIO */
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bio=BIO_new_mem_buf(mypem, -1);
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/* use it to read the PEM formatted certificate from memory into an X509
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* structure that SSL can use
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*/
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PEM_read_bio_X509(bio, &cert, 0, NULL);
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if(cert == NULL)
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printf("PEM_read_bio_X509 failed...\n");
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/* get a pointer to the X509 certificate store (which may be empty!) */
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store=SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
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/* add our certificate to this store */
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if(X509_STORE_add_cert(store, cert)==0)
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printf("error adding certificate\n");
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/* decrease reference counts */
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X509_free(cert);
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BIO_free(bio);
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/* all set to go */
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return CURLE_OK;
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}
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int main(void)
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{
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CURL * ch;
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CURLcode rv;
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rv=curl_global_init(CURL_GLOBAL_ALL);
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ch=curl_easy_init();
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rv=curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
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rv=curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L);
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rv=curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
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/* Retrieve page using cacerts' certificate -> will succeed
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* load the certificate by installing a function doing the nescessary
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* "modifications" to the SSL CONTEXT just before link init
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*/
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rv=curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
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rv=curl_easy_perform(ch);
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if(rv==CURLE_OK)
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printf("*** transfer succeeded ***\n");
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else
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printf("*** transfer failed ***\n");
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curl_easy_cleanup(ch);
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curl_global_cleanup();
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return rv;
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}
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.SH AVAILABILITY
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Added in 7.11.0 for OpenSSL. Added in 7.42.0 for wolfSSL/CyaSSL. Other SSL
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backends not supported.
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