CURLOPT_PROXY_ISSUERCERT_BLcurl)easy_setopt opCURLOPT_PROXY_ISSUERCERT_BLOB(3)
NAME
CURLOPT_PROXY_ISSUERCERT_BLOB - proxy issuer SSL certificate from mem-
ory blob
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_ISSUERCERT_BLOB,
struct curl_blob *blob);
DESCRIPTION
Pass a pointer to a curl_blob struct, 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 of the
the HTTPS proxy is indeed the one associated with the certificate pro-
vided 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 CUR-
LOPT_PROXY_SSL_VERIFYPEER(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 (CUR-
LOPT_PROXY_SSL_VERIFYPEER(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_PROXY_ISSUERCERT(3) which in-
stead 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/");
/* using an HTTPS proxy */
curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
blob.data = certificateData;
blob.len = filesize;
blob.flags = CURL_BLOB_COPY;
curl_easy_setopt(curl, CURLOPT_PROXY_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_PROXY_SSL_VERIFYPEER(3), CURLOPT_PROXY_SSL_VERIFYHOST(3), CUR-
LOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),
libcurl 7.81.0 November 08, 20CURLOPT_PROXY_ISSUERCERT_BLOB(3)
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