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construct/authd/provider.h

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/* authd/provider.h - authentication provider framework
* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __CHARYBDIS_AUTHD_PROVIDER_H__
#define __CHARYBDIS_AUTHD_PROVIDER_H__
#include "stdinc.h"
/* Arbitrary limit */
#define MAX_CLIENTS 4096
/* Registered providers */
typedef enum
{
PROVIDER_NULL = 0x0, /* Dummy value */
PROVIDER_RDNS = 0x1,
PROVIDER_IDENT = 0x2,
PROVIDER_BLACKLIST = 0x4,
} provider_t;
struct auth_client
{
uint16_t cid; /* Client ID */
char l_ip[HOSTIPLEN + 1]; /* Listener IP address */
uint16_t l_port; /* Listener port */
char c_ip[HOSTIPLEN + 1]; /* Client IP address */
uint16_t c_port; /* Client port */
char hostname[HOSTLEN + 1]; /* Used for DNS lookup */
char username[USERLEN + 1]; /* Used for ident lookup */
unsigned int providers; /* Providers at work,
* none left when set to 0 */
struct Dictionary *data; /* Provider-specific data */
};
typedef bool (*provider_init_t)(void);
typedef bool (*provider_perform_t)(struct auth_client *);
typedef void (*provider_complete_t)(struct auth_client *, provider_t provider);
typedef void (*provider_cancel_t)(struct auth_client *);
typedef void (*provider_destroy_t)(void);
struct auth_provider
{
rb_dlink_node node;
provider_t id;
provider_init_t init; /* Initalise the provider */
provider_destroy_t destroy; /* Terminate the provider */
provider_perform_t start; /* Perform authentication */
provider_cancel_t cancel; /* Authentication cancelled */
provider_complete_t completed; /* Callback for when other performers complete (think dependency chains) */
};
extern rb_dlink_list auth_providers;
extern struct auth_provider rdns_provider;
extern struct auth_provider ident_provider;
extern struct auth_client auth_clients[MAX_CLIENTS];
void load_provider(struct auth_provider *provider);
void unload_provider(struct auth_provider *provider);
void init_providers(void);
void destroy_providers(void);
void cancel_providers(struct auth_client *auth);
void provider_done(struct auth_client *auth, provider_t id);
void accept_client(struct auth_client *auth, provider_t id);
void reject_client(struct auth_client *auth, provider_t id, const char *reason);
void notice_client(struct auth_client *auth, const char *notice);
void handle_new_connection(int parc, char *parv[]);
/* Provider is operating on this auth_client (set this if you have async work to do) */
static inline void set_provider(struct auth_client *auth, provider_t provider)
{
auth->providers |= provider;
}
/* Provider is no longer operating on this auth client (you should use provider_done) */
static inline void unset_provider(struct auth_client *auth, provider_t provider)
{
auth->providers &= ~provider;
}
/* Check if provider is operating on this auth client */
static inline bool is_provider(struct auth_client *auth, provider_t provider)
{
return auth->providers & provider;
}
#endif /* __CHARYBDIS_AUTHD_PROVIDER_H__ */