CURLOPT_CAINFO_BLOB - Man Page
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 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
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
Example
char *strpem; /* strpem must point to a PEM string */ CURL *curl = curl_easy_init(); if(curl) { 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); ret = curl_easy_perform(curl); curl_easy_cleanup(curl); }
Availability
Added in 7.77.0.
This option is supported by the BearSSL (since 7.79.0), mbedTLS (since 7.81.0), rustls (since 7.82.0), OpenSSL, Secure Transport and Schannel 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_CAINFO(3), CURLOPT_CAPATH(3), CURLOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),
Referenced By
curl_easy_setopt(3), CURLOPT_CA_CACHE_TIMEOUT(3), CURLOPT_CAINFO(3), CURLOPT_PROXY_CAINFO(3), CURLOPT_PROXY_CAINFO_BLOB(3).