client session FEATURE ssh auth callbacks can be set
diff --git a/src/session_client_ch.h b/src/session_client_ch.h
index 19f6211..73b8db8 100644
--- a/src/session_client_ch.h
+++ b/src/session_client_ch.h
@@ -47,6 +47,32 @@
#ifdef ENABLE_SSH
/**
+ * @brief Set SSH Call Home password authentication callback.
+ *
+ * @param[in] auth_password Function to call, returns the password for username@hostname.
+ * If NULL, the default callback is set.
+ */
+void nc_client_ssh_ch_set_auth_password_clb(char *(*auth_password)(const char *username, const char *hostname));
+
+/**
+ * @brief Set SSH Call Home interactive authentication callback.
+ *
+ * @param[in] auth_interactive Function to call for every question, returns the answer for
+ * authentication name with instruction and echoing prompt.
+ * If NULL, the default callback is set.
+ */
+void nc_client_ssh_ch_set_auth_interactive_clb(char *(*auth_interactive)(const char *auth_name, const char *instruction,
+ const char *prompt, int echo));
+
+/**
+ * @brief Set SSH Call Home publickey authentication encrypted private key passphrase callback.
+ *
+ * @param[in] auth_privkey_passphrase Function to call for every question, returns
+ * the passphrase for the specific private key.
+ */
+void nc_client_ssh_ch_set_auth_privkey_passphrase_clb(char *(*auth_privkey_passphrase)(const char *privkey_path));
+
+/**
* @brief Add a new client bind and start listening on it for SSH Call Home connections.
*
* @param[in] address IP address to bind to.