/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* <DESC> * CA cert in memory with OpenSSL to get a HTTPS page. * </DESC> */ #include <openssl/err.h> #include <openssl/ssl.h> #include <curl/curl.h> #include <stdio.h> size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream) { fwrite(ptr, size, nmemb, (FILE *)stream); return (nmemb*size); } static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm) { CURLcode rv = CURLE_ABORTED_BY_CALLBACK; X509_STORE *store = NULL; X509 *cert = NULL; BIO *bio = NULL; char *mypem = /* CA for example.com. CN = DigiCert High Assurance EV Root CA */ "-----BEGIN CERTIFICATE-----\n" "MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs\n" "MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n" "d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j\n" "ZSBFViBSb290IENBMB4XDTA2MTExMDAwMDAwMFoXDTMxMTExMDAwMDAwMFowbDEL\n" "MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3\n" "LmRpZ2ljZXJ0LmNvbTErMCkGA1UEAxMiRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug\n" "RVYgUm9vdCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMbM5XPm\n" "+9S75S0tMqbf5YE/yc0lSbZxKsPVlDRnogocsF9ppkCxxLeyj9CYpKlBWTrT3JTW\n" "PNt0OKRKzE0lgvdKpVMSOO7zSW1xkX5jtqumX8OkhPhPYlG++MXs2ziS4wblCJEM\n" "xChBVfvLWokVfnHoNb9Ncgk9vjo4UFt3MRuNs8ckRZqnrG0AFFoEt7oT61EKmEFB\n" "Ik5lYYeBQVCmeVyJ3hlKV9Uu5l0cUyx+mM0aBhakaHPQNAQTXKFx01p8VdteZOE3\n" "hzBWBOURtCmAEvF5OYiiAhF8J2a3iLd48soKqDirCmTCv2ZdlYTBoSUeh10aUAsg\n" "EsxBu24LUTi4S8sCAwEAAaNjMGEwDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQF\n" "MAMBAf8wHQYDVR0OBBYEFLE+w2kD+L9HAdSYJhoIAu9jZCvDMB8GA1UdIwQYMBaA\n" "FLE+w2kD+L9HAdSYJhoIAu9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQAcGgaX3Nec\n" "nzyIZgYIVyHbIUf4KmeqvxgydkAQV8GK83rZEWWONfqe/EW1ntlMMUu4kehDLI6z\n" "eM7b41N5cdblIZQB2lWHmiRk9opmzN6cN82oNLFpmyPInngiK3BD41VHMWEZ71jF\n" "hS9OMPagMRYjyOfiZRYzy78aG6A9+MpeizGLYAiJLQwGXFK3xPkKmNEVX58Svnw2\n" "Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe\n" "vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep\n" "+OkuE6N36B9K\n" "-----END CERTIFICATE-----\n"; /* clear the current thread's OpenSSL error queue */ ERR_clear_error(); /* get a BIO */ bio = BIO_new_mem_buf(mypem, -1); if(!bio) goto err; /* use it to read the PEM formatted certificate from memory into an X509 * structure that SSL can use */ if(!PEM_read_bio_X509(bio, &cert, 0, NULL)) goto err; /* get a pointer to the X509 certificate store (which may be empty!) */ store = SSL_CTX_get_cert_store((SSL_CTX *)sslctx); if(!store) goto err; /* add our certificate to this store */ if(!X509_STORE_add_cert(store, cert)) { unsigned long error = ERR_peek_last_error(); /* Ignore error X509_R_CERT_ALREADY_IN_HASH_TABLE which means the * certificate is already in the store. That could happen if * libcurl already loaded the certificate from a ca cert bundle * set at libcurl build-time or runtime. */ if(ERR_GET_LIB(error) != ERR_LIB_X509 || ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) goto err; ERR_clear_error(); } rv = CURLE_OK; err: if(rv != CURLE_OK) { char errbuf[256]; unsigned long error = ERR_peek_last_error(); fprintf(stderr, "error adding certificate\n"); if(error) { ERR_error_string_n(error, errbuf, sizeof(errbuf)); fprintf(stderr, "%s\n", errbuf); } } X509_free(cert); BIO_free(bio); ERR_clear_error(); return rv; } int main(void) { CURL *ch; CURLcode rv; rv = curl_global_init(CURL_GLOBAL_ALL); ch = curl_easy_init(); rv = curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L); rv = curl_easy_setopt(ch, CURLOPT_HEADER, 0L); rv = curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L); rv = curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L); rv = curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, *writefunction); rv = curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout); rv = curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, *writefunction); rv = curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr); rv = curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM"); rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L); rv = curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/"); /* turn off the default CA locations (optional) * otherwise libcurl will load CA certificates from the locations that * were detected/specified at build-time */ rv = curl_easy_setopt(ch, CURLOPT_CAINFO, NULL); rv = curl_easy_setopt(ch, CURLOPT_CAPATH, NULL); /* first try: retrieve page without ca certificates -> should fail * unless libcurl was built --with-ca-fallback enabled at build-time */ rv = curl_easy_perform(ch); if(rv == CURLE_OK) printf("*** transfer succeeded ***\n"); else printf("*** transfer failed ***\n"); /* use a fresh connection (optional) * this option seriously impacts performance of multiple transfers but * it is necessary order to demonstrate this example. recall that the * ssl ctx callback is only called _before_ an SSL connection is * established, therefore it will not affect existing verified SSL * connections already in the connection cache associated with this * handle. normally you would set the ssl ctx function before making * any transfers, and not use this option. */ rv = curl_easy_setopt(ch, CURLOPT_FRESH_CONNECT, 1L); /* second try: retrieve page using cacerts' certificate -> will succeed * load the certificate by installing a function doing the necessary * "modifications" to the SSL CONTEXT just before link init */ rv = curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function); rv = curl_easy_perform(ch); if(rv == CURLE_OK) printf("*** transfer succeeded ***\n"); else printf("*** transfer failed ***\n"); curl_easy_cleanup(ch); curl_global_cleanup(); return rv; }