93 lines
2.4 KiB
Markdown
93 lines
2.4 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_BLOB
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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_ISSUERCERT (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_BLOB - issuer SSL certificate from memory blob
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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_BLOB,
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struct curl_blob *stblob);
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~~~
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# 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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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).
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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 CURLOPT_ISSUERCERT(3) which instead
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expects a filename as input.
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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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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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~~~
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# AVAILABILITY
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Added in 7.71.0. This option is supported by the OpenSSL backends.
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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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