CURLOPT_ISSUERCERT_BLOB(3) curl_easy_setopt options CURLOPT_ISSUERCERT_BLOB(3)
NAME
CURLOPT_ISSUERCERT_BLOB - issuer SSL certificate from memory blob
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ISSUERCERT_BLOB,
struct curl_blob *stblob);
DESCRIPTION
Pass a pointer to a curl_blob structure, which contains information
(pointer and size) about a memory block with binary data of a CA cer-
tificate in PEM format. If the option is set, an additional check
against the peer certificate is performed to verify the issuer is in-
deed the one associated with the certificate provided by the option.
This additional check is useful in multi-level PKI where one needs to
enforce that the peer certificate is from a specific branch of the
tree.
This option should be used in combination with the CURLOPT_SSL_VERI-
FYPEER(3) option. Otherwise, the result of the check is not considered
as failure.
A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the op-
tion, which is returned if the setup of the SSL/TLS session has failed
due to a mismatch with the issuer of peer certificate (CURLOPT_SSL_VER-
IFYPEER(3) has to be set too for the check to fail).
If the blob is initialized with the flags member of struct curl_blob
set to CURL_BLOB_COPY, the application does not have to keep the buffer
around after setting this.
This option is an alternative to CURLOPT_ISSUERCERT(3) which instead
expects a file name as input.
DEFAULT
NULL
PROTOCOLS
All TLS-based protocols
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
struct curl_blob blob;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
blob.data = certificateData;
blob.len = filesize;
blob.flags = CURL_BLOB_COPY;
curl_easy_setopt(curl, CURLOPT_ISSUERCERT_BLOB, &blob);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITY
Added in 7.71.0. This option is supported by the OpenSSL backends.
RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSO
CURLOPT_ISSUERCERT(3), CURLOPT_CRLFILE(3), CURLOPT_SSL_VERIFYPEER(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_ISSUERCERT_BLOB(3)
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