CURLOPT_SSH_KEYFUNCTION(3) Library Functions Manual CURLOPT_SSH_KEYFUNCTION(3)

CURLOPT_SSH_KEYFUNCTION - callback for known host matching logic

#include <curl/curl.h>
enum curl_khstat {

CURLKHSTAT_FINE_ADD_TO_FILE,
CURLKHSTAT_FINE,
CURLKHSTAT_REJECT, /* reject the connection, return an error */
CURLKHSTAT_DEFER, /* do not accept it, but we cannot answer right
now. Causes a CURLE_PEER_FAILED_VERIFICATION error but
the connection is left intact */
CURLKHSTAT_FINE_REPLACE }; enum curl_khmatch {
CURLKHMATCH_OK, /* match */
CURLKHMATCH_MISMATCH, /* host found, key mismatch! */
CURLKHMATCH_MISSING, /* no matching host/key found */ }; struct curl_khkey {
const char *key; /* points to a null-terminated string encoded with
base64 if len is zero, otherwise to the "raw"
data */
size_t len;
enum curl_khtype keytype; }; int ssh_keycallback(CURL *easy,
const struct curl_khkey *knownkey,
const struct curl_khkey *foundkey,
enum curl_khmatch match,
void *clientp); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_KEYFUNCTION,
ssh_keycallback);

Pass a pointer to your callback function, which should match the prototype shown above.

It gets called when the known_host matching has been done, to allow the application to act and decide for libcurl how to proceed. The callback is only called if CURLOPT_SSH_KNOWNHOSTS(3) is also set.

This callback function gets passed the CURL handle, the key from the known_hosts file knownkey, the key from the remote site foundkey, info from libcurl on the matching status and a custom pointer (set with CURLOPT_SSH_KEYDATA(3)). It MUST return one of the following return codes to tell libcurl how to act:

The new host+key is accepted and libcurl replaces the old host+key into the known_hosts file before continuing with the connection. This also adds the new host+key combo to the known_host pool kept in memory if it was not already present there. The adding of data to the file is done by completely replacing the file with a new copy, so the permissions of the file must allow this. (Added in 7.73.0)
The host+key is accepted and libcurl appends it to the known_hosts file before continuing with the connection. This also adds the host+key combo to the known_host pool kept in memory if it was not already present there. The adding of data to the file is done by completely replacing the file with a new copy, so the permissions of the file must allow this.
The host+key is accepted libcurl continues with the connection. This also adds the host+key combo to the known_host pool kept in memory if it was not already present there.
The host+key is rejected. libcurl denies the connection to continue and it is closed.
The host+key is rejected, but the SSH connection is asked to be kept alive. This feature could be used when the app wants to return and act on the host+key situation and then retry without needing the overhead of setting it up from scratch again.

NULL

SFTP and SCP

struct mine {

void *custom; }; static int keycb(CURL *easy,
const struct curl_khkey *knownkey,
const struct curl_khkey *foundkey,
enum curl_khmatch match,
void *clientp) {
/* 'clientp' points to the callback_data struct */
/* investigate the situation and return the correct value */
return CURLKHSTAT_FINE_ADD_TO_FILE; } int main(void) {
CURL *curl = curl_easy_init();
if(curl) {
struct mine callback_data;
curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/thisfile.txt");
curl_easy_setopt(curl, CURLOPT_SSH_KEYFUNCTION, keycb);
curl_easy_setopt(curl, CURLOPT_SSH_KEYDATA, &callback_data);
curl_easy_setopt(curl, CURLOPT_SSH_KNOWNHOSTS, "/home/user/known_hosts");
curl_easy_perform(curl); } }

Added in 7.19.6

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_SSH_KEYDATA(3), CURLOPT_SSH_KNOWNHOSTS(3)

September 26, 2023 ibcurl 8.4.0