2024-03-15 20:55:33 -06:00
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.\" generated by cd2nroff 0.1 from CURLOPT_ISSUERCERT.md
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2024-03-30 12:28:04 -06:00
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.TH CURLOPT_ISSUERCERT 3 libcurl
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.SH NAME
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CURLOPT_ISSUERCERT \- issuer SSL certificate filename
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH DESCRIPTION
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Pass a char pointer to a null\-terminated string naming a \fIfile\fP 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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\fICURLOPT_SSL_VERIFYPEER(3)\fP 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 (\fICURLOPT_SSL_VERIFYPEER(3)\fP
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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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.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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This option works only with the following TLS backends:
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GnuTLS and OpenSSL
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.SH EXAMPLE
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.nf
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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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.fi
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.SH AVAILABILITY
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If built TLS enabled
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.SH 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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.SH SEE ALSO
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.BR CURLOPT_CRLFILE (3),
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.BR CURLOPT_SSL_VERIFYHOST (3),
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.BR CURLOPT_SSL_VERIFYPEER (3)
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