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75 lines
2.5 KiB
Groff
75 lines
2.5 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_ISSUERCERT_BLOB.md
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.TH CURLOPT_ISSUERCERT_BLOB 3 "2024-07-29" libcurl
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.SH NAME
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CURLOPT_ISSUERCERT_BLOB \- issuer SSL certificate from memory blob
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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_BLOB,
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struct curl_blob *stblob);
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.fi
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.SH DESCRIPTION
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Pass a pointer to a curl_blob structure, which contains information (pointer
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and size) about a memory block with binary data of a CA certificate in PEM
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format. If the option is set, an additional check against the peer certificate
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is performed to verify the issuer is indeed the one associated with the
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certificate provided by the option. This additional check is useful in
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multi\-level PKI where one needs to enforce that the peer certificate is from a
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specific branch of the tree.
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This option should be 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).
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If the blob is initialized with the flags member of struct curl_blob set to
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CURL_BLOB_COPY, the application does not have to keep the buffer around after
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setting this.
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This option is an alternative to \fICURLOPT_ISSUERCERT(3)\fP which instead
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expects a filename as input.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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This functionality affects 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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OpenSSL
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.SH EXAMPLE
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.nf
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extern char *certificateData;
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extern size_t filesize;
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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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struct curl_blob blob;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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blob.data = certificateData;
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blob.len = filesize;
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blob.flags = CURL_BLOB_COPY;
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curl_easy_setopt(curl, CURLOPT_ISSUERCERT_BLOB, &blob);
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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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Added in curl 7.71.0
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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_ISSUERCERT (3),
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.BR CURLOPT_SSL_VERIFYHOST (3),
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.BR CURLOPT_SSL_VERIFYPEER (3)
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