src/server_config.h - github/CESNET/libnetconf2 - Gitiles

 /**
  * @file server_config.h
  * @author Roman Janota <janota@cesnet.cz>
  * @brief libnetconf2 server configuration
  *
  * @copyright
  * Copyright (c) 2015 - 2021 CESNET, z.s.p.o.
  *
  * This source code is licensed under BSD 3-Clause License (the "License").
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     https://opensource.org/licenses/BSD-3-Clause
  */

 #ifndef NC_CONFIG_SERVER_H_
 #define NC_CONFIG_SERVER_H_

 #ifdef __cplusplus
 extern "C" {
 #endif

 #include <libyang/libyang.h>
 #include <stdint.h>

 #include "netconf.h"
 #include "session.h"
 #include "session_p.h"

 /**
  * @brief Configure server based on the given diff data.
  *
  * Expected data are a validated instance of a ietf-netconf-server YANG data.
  * The data must be in the diff format and supported operations are: create, replace,
  * delete and none. Context must already have implemented the required modules, see
  * ::nc_config_load_modules().
  *
  * @param[in] diff ietf-netconf-server YANG diff data.
  * @return 0 on success, 1 on error.
  */
 int nc_server_config_setup_diff(const struct lyd_node *diff);

 /**
  * @brief Configure server based on the given data.
  *
  * Expected data is a validated instance of a ietf-netconf-server YANG data.
  * Behaves as if all the nodes in data had the replace operation. That means that the current configuration will be deleted
  * and just the given data will all be applied.
  * The data must not contain any operation attribute, see ::nc_config_setup_diff() which works with diff.
  * Context must already have implemented the required modules, see * ::nc_config_load_modules().
  *
  * @param[in] data ietf-netconf-server YANG data.
  * @return 0 on success, 1 on error.
  */
 int nc_server_config_setup_data(const struct lyd_node *data);

 /**
  * @brief Configure server based on the given ietf-netconf-server YANG data.
  * Wrapper around ::nc_config_setup_server_data() hiding work with parsing the data.
  *
  * @param[in] ctx libyang context.
  * @param[in] path Path to the file with YANG data in XML format.
  * @return 0 on success, 1 on error.
  */
 int nc_server_config_setup_path(const struct ly_ctx *ctx, const char *path);

 /**
  * @brief Implements all the required modules and their features in the context.
  * Needs to be called before any other configuration functions.
  *
  * If ctx is :
  *      - NULL: a new context will be created and if the call is successful you have to free it,
  *      - non NULL: modules will simply be implemented.
  *
  * Implemented modules: ietf-netconf-server, ietf-x509-cert-to-name, ietf-crypto-types,
  * ietf-tcp-common, ietf-ssh-common, iana-ssh-encryption-algs, iana-ssh-key-exchange-algs,
  * iana-ssh-mac-algs, iana-ssh-public-key-algs, ietf-keystore, ietf-ssh-server, ietf-truststore,
  * ietf-tls-server and libnetconf2-netconf-server.
  *
  * @param[in, out] ctx Optional context in which the modules will be implemented. Created if ctx is null.
  * @return 0 on success, 1 on error.
  */
 int nc_server_config_load_modules(struct ly_ctx **ctx);

 /**
  * @brief Creates new YANG configuration data nodes for a hostkey.
  *
  * @param[in] privkey_path Path to a file containing a private key.
  * The private key has to be in a PEM format. Only RSA and ECDSA keys are supported.
  * @param[in] pubkey_path Path to a file containing a public key. If NULL, public key will be
  * generated from the private key.
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's hostkey might be changed.
  * @param[in] hostkey_name Arbitrary identifier of the hostkey.
  * If a hostkey with this identifier already exists, it's contents will be changed.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_hostkey(const char *privkey_path, const char *pubkey_path, const struct ly_ctx *ctx,
         const char *endpt_name, const char *hostkey_name, struct lyd_node **config);

 /**
  * @brief Creates new YANG configuration data nodes for a local-address and local-port.
  *
  * @param[in] address New listening address.
  * @param[in] port New listening port.
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's address and port will be overriden.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_address_port(const char *address, const char *port, const struct ly_ctx *ctx,
         const char *endpt_name, struct lyd_node **config);

 /**
  * @brief Creates new YANG configuration data nodes for host-key algorithms replacing any previous ones.
  *
  * Supported algorithms are: ssh-ed25519, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521,
  * rsa-sha2-512, rsa-sha2-256, ssh-rsa and ssh-dss.
  *
  * @param[in] ctx libyang context
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's host-key algorithms will be replaced.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @param[in] alg_count Number of following algorithms.
  * @param[in] ... String literals of host-key algorithms in a decreasing order of preference.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_host_key_algs(const struct ly_ctx *ctx, const char *endpt_name,
         struct lyd_node **config, int alg_count, ...);

 /**
  * @brief Creates new YANG configuration data nodes for key exchange algorithms replacing any previous ones.
  *
  * Supported algorithms are: diffie-hellman-group-exchange-sha1, curve25519-sha256, ecdh-sha2-nistp256,
  * ecdh-sha2-nistp384, ecdh-sha2-nistp521, diffie-hellman-group18-sha512, diffie-hellman-group16-sha512,
  * diffie-hellman-group-exchange-sha256 and diffie-hellman-group14-sha256.
  *
  * @param[in] ctx libyang context
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's key exchange algorithms will be replaced.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @param[in] alg_count Number of following algorithms.
  * @param[in] ... String literals of key exchange algorithms in a decreasing order of preference.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_key_exchange_algs(const struct ly_ctx *ctx, const char *endpt_name, struct lyd_node **config,
         int alg_count, ...);

 /**
  * @brief Creates new YANG configuration data nodes for encryption algorithms replacing any previous ones.
  *
  * Supported algorithms are: aes256-ctr, aes192-ctr, aes128-ctr, aes256-cbc, aes192-cbc, aes128-cbc, blowfish-cbc
  * triple-des-cbc and none.
  *
  * @param[in] ctx libyang context
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's encryption algorithms will be replaced.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @param[in] alg_count Number of following algorithms.
  * @param[in] ... String literals of encryption algorithms in a decreasing order of preference.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_encryption_algs(const struct ly_ctx *ctx, const char *endpt_name, struct lyd_node **config,
         int alg_count, ...);

 /**
  * @brief Creates new YANG configuration data nodes for mac algorithms replacing any previous ones.
  *
  * Supported algorithms are: hmac-sha2-256, hmac-sha2-512 and hmac-sha1.
  *
  * @param[in] ctx libyang context
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's mac algorithms will be replaced.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @param[in] alg_count Number of following algorithms.
  * @param[in] ... String literals of mac algorithms in a decreasing order of preference.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_mac_algs(const struct ly_ctx *ctx, const char *endpt_name, struct lyd_node **config,
         int alg_count, ...);

 /**
  * @brief Creates new YANG configuration data nodes for a client, which supports the public key authentication method.
  *
  * @param[in] pubkey_path Path to a file containing the user's public key.
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's user might be changed.
  * @param[in] user_name Arbitrary identifier of the user.
  * If an user with this identifier already exists, it's contents will be changed.
  * @param[in] pubkey_name Arbitrary identifier of the user's public key.
  * If a public key with this identifier already exists for this user, it's contents will be changed.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_client_auth_pubkey(const char *pubkey_path, const struct ly_ctx *ctx, const char *endpt_name,
         const char *user_name, const char *pubkey_name, struct lyd_node **config);

 /**
  * @brief Creates new YANG configuration data nodes for a client, which supports the password authentication method.
  *
  * This function sets the password for the given user.
  *
  * @param[in] password Cleartext user's password.
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's user might be changed.
  * @param[in] user_name Arbitrary identifier of the user.
  * If an user with this identifier already exists, it's contents will be changed.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_client_auth_password(const char *password, const struct ly_ctx *ctx, const char *endpt_name,
         const char *user_name, struct lyd_node **config);

 /**
  * @brief Creates new YANG configuration data nodes for a client, which supports the none authentication method.
  *
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's user might be changed.
  * @param[in] user_name Arbitrary identifier of the user.
  * If an user with this identifier already exists, it's contents will be changed.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_client_auth_none(const struct ly_ctx *ctx, const char *endpt_name,
         const char *user_name, struct lyd_node **config);

 /**
  * @brief Creates new YANG configuration data nodes for a client, which supports the interactive authentication method.
  *
  * @param[in] pam_config_name Name of the PAM configuration file.
  * @param[in] pam_config_name Optional. The absolute path to the directory in which the configuration file
  * with the name conf_name is located. A newer version (>= 1.4) of PAM library is required to be able to specify
  * the path. If NULL is passed, then the PAM's system directories will be searched (usually /etc/pam.d/).
  * @param[in] ctx libyang context.
  * @param[in] endpt_name Arbitrary identifier of the endpoint.
  * If an endpoint with this identifier already exists, it's user might be changed.
  * @param[in] user_name Arbitrary identifier of the user.
  * If an user with this identifier already exists, it's contents will be changed.
  * @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
  * Otherwise the new YANG data will be added to the previous data and may override it.
  * @return 0 on success, non-zero otherwise.
  */
 int nc_server_config_new_ssh_client_auth_interactive(const char *pam_config_name, const char *pam_config_dir,
         const struct ly_ctx *ctx, const char *endpt_name,
         const char *user_name, struct lyd_node **config);

 #ifdef __cplusplus
 }
 #endif

 #endif /* NC_SESSION_SERVER_H_ */
	/**
	* @file server_config.h
	* @author Roman Janota <janota@cesnet.cz>
	* @brief libnetconf2 server configuration
	*
	* @copyright
	* Copyright (c) 2015 - 2021 CESNET, z.s.p.o.
	*
	* This source code is licensed under BSD 3-Clause License (the "License").
	* You may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* https://opensource.org/licenses/BSD-3-Clause
	*/

	#ifndef NC_CONFIG_SERVER_H_
	#define NC_CONFIG_SERVER_H_

	#ifdef __cplusplus
	extern "C" {
	#endif

	#include <libyang/libyang.h>
	#include <stdint.h>

	#include "netconf.h"
	#include "session.h"
	#include "session_p.h"

	/**
	* @brief Configure server based on the given diff data.
	*
	* Expected data are a validated instance of a ietf-netconf-server YANG data.
	* The data must be in the diff format and supported operations are: create, replace,
	* delete and none. Context must already have implemented the required modules, see
	* ::nc_config_load_modules().
	*
	* @param[in] diff ietf-netconf-server YANG diff data.
	* @return 0 on success, 1 on error.
	*/
	int nc_server_config_setup_diff(const struct lyd_node *diff);

	/**
	* @brief Configure server based on the given data.
	*
	* Expected data is a validated instance of a ietf-netconf-server YANG data.
	* Behaves as if all the nodes in data had the replace operation. That means that the current configuration will be deleted
	* and just the given data will all be applied.
	* The data must not contain any operation attribute, see ::nc_config_setup_diff() which works with diff.
	* Context must already have implemented the required modules, see * ::nc_config_load_modules().
	*
	* @param[in] data ietf-netconf-server YANG data.
	* @return 0 on success, 1 on error.
	*/
	int nc_server_config_setup_data(const struct lyd_node *data);

	/**
	* @brief Configure server based on the given ietf-netconf-server YANG data.
	* Wrapper around ::nc_config_setup_server_data() hiding work with parsing the data.
	*
	* @param[in] ctx libyang context.
	* @param[in] path Path to the file with YANG data in XML format.
	* @return 0 on success, 1 on error.
	*/
	int nc_server_config_setup_path(const struct ly_ctx ctx, const char path);

	/**
	* @brief Implements all the required modules and their features in the context.
	* Needs to be called before any other configuration functions.
	*
	* If ctx is :
	* - NULL: a new context will be created and if the call is successful you have to free it,
	* - non NULL: modules will simply be implemented.
	*
	* Implemented modules: ietf-netconf-server, ietf-x509-cert-to-name, ietf-crypto-types,
	* ietf-tcp-common, ietf-ssh-common, iana-ssh-encryption-algs, iana-ssh-key-exchange-algs,
	* iana-ssh-mac-algs, iana-ssh-public-key-algs, ietf-keystore, ietf-ssh-server, ietf-truststore,
	* ietf-tls-server and libnetconf2-netconf-server.
	*
	* @param[in, out] ctx Optional context in which the modules will be implemented. Created if ctx is null.
	* @return 0 on success, 1 on error.
	*/
	int nc_server_config_load_modules(struct ly_ctx **ctx);

	/**
	* @brief Creates new YANG configuration data nodes for a hostkey.
	*
	* @param[in] privkey_path Path to a file containing a private key.
	* The private key has to be in a PEM format. Only RSA and ECDSA keys are supported.
	* @param[in] pubkey_path Path to a file containing a public key. If NULL, public key will be
	* generated from the private key.
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's hostkey might be changed.
	* @param[in] hostkey_name Arbitrary identifier of the hostkey.
	* If a hostkey with this identifier already exists, it's contents will be changed.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_hostkey(const char privkey_path, const char pubkey_path, const struct ly_ctx *ctx,
	const char endpt_name, const char hostkey_name, struct lyd_node **config);

	/**
	* @brief Creates new YANG configuration data nodes for a local-address and local-port.
	*
	* @param[in] address New listening address.
	* @param[in] port New listening port.
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's address and port will be overriden.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_address_port(const char address, const char port, const struct ly_ctx *ctx,
	const char endpt_name, struct lyd_node *config);

	/**
	* @brief Creates new YANG configuration data nodes for host-key algorithms replacing any previous ones.
	*
	* Supported algorithms are: ssh-ed25519, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521,
	* rsa-sha2-512, rsa-sha2-256, ssh-rsa and ssh-dss.
	*
	* @param[in] ctx libyang context
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's host-key algorithms will be replaced.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @param[in] alg_count Number of following algorithms.
	* @param[in] ... String literals of host-key algorithms in a decreasing order of preference.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_host_key_algs(const struct ly_ctx ctx, const char endpt_name,
	struct lyd_node **config, int alg_count, ...);

	/**
	* @brief Creates new YANG configuration data nodes for key exchange algorithms replacing any previous ones.
	*
	* Supported algorithms are: diffie-hellman-group-exchange-sha1, curve25519-sha256, ecdh-sha2-nistp256,
	* ecdh-sha2-nistp384, ecdh-sha2-nistp521, diffie-hellman-group18-sha512, diffie-hellman-group16-sha512,
	* diffie-hellman-group-exchange-sha256 and diffie-hellman-group14-sha256.
	*
	* @param[in] ctx libyang context
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's key exchange algorithms will be replaced.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @param[in] alg_count Number of following algorithms.
	* @param[in] ... String literals of key exchange algorithms in a decreasing order of preference.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_key_exchange_algs(const struct ly_ctx ctx, const char endpt_name, struct lyd_node **config,
	int alg_count, ...);

	/**
	* @brief Creates new YANG configuration data nodes for encryption algorithms replacing any previous ones.
	*
	* Supported algorithms are: aes256-ctr, aes192-ctr, aes128-ctr, aes256-cbc, aes192-cbc, aes128-cbc, blowfish-cbc
	* triple-des-cbc and none.
	*
	* @param[in] ctx libyang context
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's encryption algorithms will be replaced.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @param[in] alg_count Number of following algorithms.
	* @param[in] ... String literals of encryption algorithms in a decreasing order of preference.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_encryption_algs(const struct ly_ctx ctx, const char endpt_name, struct lyd_node **config,
	int alg_count, ...);

	/**
	* @brief Creates new YANG configuration data nodes for mac algorithms replacing any previous ones.
	*
	* Supported algorithms are: hmac-sha2-256, hmac-sha2-512 and hmac-sha1.
	*
	* @param[in] ctx libyang context
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's mac algorithms will be replaced.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @param[in] alg_count Number of following algorithms.
	* @param[in] ... String literals of mac algorithms in a decreasing order of preference.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_mac_algs(const struct ly_ctx ctx, const char endpt_name, struct lyd_node **config,
	int alg_count, ...);

	/**
	* @brief Creates new YANG configuration data nodes for a client, which supports the public key authentication method.
	*
	* @param[in] pubkey_path Path to a file containing the user's public key.
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's user might be changed.
	* @param[in] user_name Arbitrary identifier of the user.
	* If an user with this identifier already exists, it's contents will be changed.
	* @param[in] pubkey_name Arbitrary identifier of the user's public key.
	* If a public key with this identifier already exists for this user, it's contents will be changed.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_client_auth_pubkey(const char pubkey_path, const struct ly_ctx ctx, const char *endpt_name,
	const char user_name, const char pubkey_name, struct lyd_node **config);

	/**
	* @brief Creates new YANG configuration data nodes for a client, which supports the password authentication method.
	*
	* This function sets the password for the given user.
	*
	* @param[in] password Cleartext user's password.
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's user might be changed.
	* @param[in] user_name Arbitrary identifier of the user.
	* If an user with this identifier already exists, it's contents will be changed.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_client_auth_password(const char password, const struct ly_ctx ctx, const char *endpt_name,
	const char user_name, struct lyd_node *config);

	/**
	* @brief Creates new YANG configuration data nodes for a client, which supports the none authentication method.
	*
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's user might be changed.
	* @param[in] user_name Arbitrary identifier of the user.
	* If an user with this identifier already exists, it's contents will be changed.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_client_auth_none(const struct ly_ctx ctx, const char endpt_name,
	const char user_name, struct lyd_node *config);

	/**
	* @brief Creates new YANG configuration data nodes for a client, which supports the interactive authentication method.
	*
	* @param[in] pam_config_name Name of the PAM configuration file.
	* @param[in] pam_config_name Optional. The absolute path to the directory in which the configuration file
	* with the name conf_name is located. A newer version (>= 1.4) of PAM library is required to be able to specify
	* the path. If NULL is passed, then the PAM's system directories will be searched (usually /etc/pam.d/).
	* @param[in] ctx libyang context.
	* @param[in] endpt_name Arbitrary identifier of the endpoint.
	* If an endpoint with this identifier already exists, it's user might be changed.
	* @param[in] user_name Arbitrary identifier of the user.
	* If an user with this identifier already exists, it's contents will be changed.
	* @param[in,out] config Configuration YANG data tree. If *config is NULL, it will be created.
	* Otherwise the new YANG data will be added to the previous data and may override it.
	* @return 0 on success, non-zero otherwise.
	*/
	int nc_server_config_new_ssh_client_auth_interactive(const char pam_config_name, const char pam_config_dir,
	const struct ly_ctx ctx, const char endpt_name,
	const char user_name, struct lyd_node *config);

	#ifdef __cplusplus
	}
	#endif

	#endif /* NC_SESSION_SERVER_H_ */