78 lines
1.9 KiB
Markdown
78 lines
1.9 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_ISSUERCERT
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_CRLFILE (3)
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- CURLOPT_SSL_VERIFYHOST (3)
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- CURLOPT_SSL_VERIFYPEER (3)
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---
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# NAME
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CURLOPT_ISSUERCERT - issuer SSL certificate filename
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ISSUERCERT, char *file);
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~~~
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# DESCRIPTION
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Pass a char pointer to a null-terminated string naming a *file* holding a CA
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certificate in PEM format. If the option is set, an additional check against
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the peer certificate is performed to verify the issuer is indeed the one
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associated with the certificate provided by the option. This additional check
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is useful in multi-level PKI where one needs to enforce that the peer
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certificate is from a specific branch of the tree.
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This option makes sense only when used in combination with the
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CURLOPT_SSL_VERIFYPEER(3) option. Otherwise, the result of the check is
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not considered as failure.
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A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the option,
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which is returned if the setup of the SSL/TLS session has failed due to a
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mismatch with the issuer of peer certificate (CURLOPT_SSL_VERIFYPEER(3)
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has to be set too for the check to fail). (Added in 7.19.0)
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The application does not have to keep the string around after setting this
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option.
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# DEFAULT
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NULL
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# PROTOCOLS
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All TLS-based protocols
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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curl_easy_setopt(curl, CURLOPT_ISSUERCERT, "/etc/certs/cacert.pem");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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If built TLS enabled
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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