CURLOPT_CAINFO_BLOB(3)

NAME
CURLOPT_CAINFO_BLOB - Certificate Authority (CA) bundle in PEM format

SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO_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 PEM encoded content holding one or more certificates to verify the HTTPS server with. 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. If CURLOPT_SSL_VERIFYPEER(3) is zero and you avoid verifying the server's certificate, CURLOPT_CAINFO_BLOB(3) is not needed. This option overrides CURLOPT_CAINFO(3).

DEFAULT
NULL

PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. only This option works only with the following TLS backends: GnuTLS, OpenSSL, Rustls, Schannel, mbedTLS and wolfSSL

EXAMPLE
#include <stdint.h> /* for uintptr_t */
#include <string.h>
int main(void)
{
  static const char *strpem = "PEMDATA"; /* must point to a PEM string */
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    struct curl_blob blob;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    blob.data = (void *)(uintptr_t)(const void *)strpem; /* strip const */
    blob.len = strlen(strpem);
    blob.flags = CURL_BLOB_COPY;
    curl_easy_setopt(curl, CURLOPT_CAINFO_BLOB, &blob);
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

HISTORY
This option is supported by the mbedTLS (since 7.81.0), Rustls (since 7.82.0), wolfSSL (since 8.2.0), GnuTLS (since 8.18.0), OpenSSL and Schannel backends.

AVAILABILITY
Added in curl 7.77.0

RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

SEE ALSO
CURLOPT_CAINFO(3), CURLOPT_CAPATH(3), CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)