Tribblix: manual page: CURLOPT_CAINFO

CURLOPT_CAINFO_BLOB(3) Introduction to Library Functions

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.

This option works only with the following TLS backends: BearSSL,
OpenSSL, Schannel, Secure Transport, mbedTLS, rustls and wolfSSL

EXAMPLE

#include <string.h>

int main(void)
{
char *strpem; /* strpem must point to a PEM string */
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
struct curl_blob blob;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
blob.data = strpem;
blob.len = strlen(strpem);
blob.flags = CURL_BLOB_COPY;
curl_easy_setopt(curl, CURLOPT_CAINFO_BLOB, &blob);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

HISTORY

This option is supported by the BearSSL (since 7.79.0), mbedTLS
(since 7.81.0), Rustls (since 7.82.0), wolfSSL (since 8.2.0),
OpenSSL, Secure Transport 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).