solanum/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"
#include "authd.h"
#include "rb_dictionary.h"
#define MAX_PROVIDERS 32 /* This should be enough */
typedef enum
{
PROVIDER_STATUS_NOTRUN = 0,
PROVIDER_STATUS_RUNNING,
PROVIDER_STATUS_DONE,
} provider_status_t;
struct auth_client_data
{
struct auth_provider *provider; /* Pointer back */
time_t timeout; /* Provider timeout */
void *data; /* Provider data */
provider_status_t status; /* Provider status */
};
struct auth_client
{
uint32_t cid; /* Client ID */
char l_ip[HOSTIPLEN + 1]; /* Listener IP address */
uint16_t l_port; /* Listener port */
struct rb_sockaddr_storage l_addr; /* Listener address/port */
char c_ip[HOSTIPLEN + 1]; /* Client IP address */
uint16_t c_port; /* Client port */
struct rb_sockaddr_storage c_addr; /* Client address/port */
char hostname[HOSTLEN + 1]; /* Used for DNS lookup */
char username[USERLEN + 1]; /* Used for ident lookup */
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bool providers_starting; /* Providers are still warming up */
bool providers_cancelled; /* Providers are being cancelled */
unsigned int providers_active; /* Number of active providers */
unsigned int refcount; /* Held references */
struct auth_client_data *data; /* Provider-specific data */
};
typedef bool (*provider_init_t)(void);
typedef void (*provider_destroy_t)(void);
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typedef bool (*provider_start_t)(struct auth_client *);
typedef void (*provider_cancel_t)(struct auth_client *);
typedef void (*uint32_timeout_t)(struct auth_client *);
typedef void (*provider_complete_t)(struct auth_client *, uint32_t);
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struct auth_stats_handler
{
const char letter;
authd_stat_handler handler;
};
struct auth_provider
{
rb_dlink_node node;
uint32_t id; /* Provider ID */
const char *name; /* Name of the provider */
char letter; /* Letter used on reject, etc. */
provider_init_t init; /* Initalise the provider */
provider_destroy_t destroy; /* Terminate the provider */
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provider_start_t start; /* Perform authentication */
provider_cancel_t cancel; /* Authentication cancelled */
uint32_timeout_t timeout; /* Timeout callback */
provider_complete_t completed; /* Callback for when other performers complete (think dependency chains) */
struct auth_stats_handler stats_handler;
struct auth_opts_handler *opt_handlers;
};
extern struct auth_provider rdns_provider;
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extern struct auth_provider ident_provider;
extern struct auth_provider blacklist_provider;
extern struct auth_provider opm_provider;
extern rb_dlink_list auth_providers;
extern rb_dictionary *auth_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, uint32_t id);
void accept_client(struct auth_client *auth);
void reject_client(struct auth_client *auth, uint32_t id, const char *data, const char *fmt, ...);
void handle_new_connection(int parc, char *parv[]);
void handle_cancel_connection(int parc, char *parv[]);
void auth_client_free(struct auth_client *auth);
static inline void
auth_client_ref(struct auth_client *auth)
{
auth->refcount++;
}
static inline void
auth_client_unref(struct auth_client *auth)
{
auth->refcount--;
if (auth->refcount == 0)
auth_client_free(auth);
}
/* Get a provider by name */
static inline struct auth_provider *
find_provider(const char *name)
{
rb_dlink_node *ptr;
RB_DLINK_FOREACH(ptr, auth_providers.head)
{
struct auth_provider *provider = ptr->data;
if(strcasecmp(provider->name, name) == 0)
return provider;
}
return NULL;
}
/* Get a provider's id by name */
static inline bool
get_provider_id(const char *name, uint32_t *id)
{
struct auth_provider *provider = find_provider(name);
if(provider != NULL)
{
*id = provider->id;
return true;
}
else
return false;
}
/* Get a provider's raw status */
static inline provider_status_t
get_provider_status(struct auth_client *auth, uint32_t provider)
{
return auth->data[provider].status;
}
/* Set a provider's raw status */
static inline void
set_provider_status(struct auth_client *auth, uint32_t provider, provider_status_t status)
{
auth->data[provider].status = status;
}
/* Set the provider as running
* If you're doing asynchronous work call this */
static inline void
set_provider_running(struct auth_client *auth, uint32_t provider)
{
auth->providers_active++;
set_provider_status(auth, provider, PROVIDER_STATUS_RUNNING);
}
/* Provider is no longer operating on this auth client
* You should use provider_done and not this */
static inline void
set_provider_done(struct auth_client *auth, uint32_t provider)
{
set_provider_status(auth, provider, PROVIDER_STATUS_DONE);
auth->providers_active--;
}
/* Check if provider is operating on this auth client */
static inline bool
is_provider_running(struct auth_client *auth, uint32_t provider)
{
return get_provider_status(auth, provider) == PROVIDER_STATUS_RUNNING;
}
/* Check if provider has finished on this client */
static inline bool
is_provider_done(struct auth_client *auth, uint32_t provider)
{
return get_provider_status(auth, provider) == PROVIDER_STATUS_DONE;
}
/* Get provider auth client data */
static inline void *
get_provider_data(struct auth_client *auth, uint32_t id)
{
return auth->data[id].data;
}
/* Set provider auth client data */
static inline void
set_provider_data(struct auth_client *auth, uint32_t id, void *data)
{
auth->data[id].data = data;
}
/* Set timeout relative to current time on provider
* When the timeout lapses, the provider's timeout call will execute */
static inline void
set_provider_timeout_relative(struct auth_client *auth, uint32_t id, time_t timeout)
{
auth->data[id].timeout = timeout + rb_current_time();
}
/* Set timeout value in absolute time (Unix timestamp)
* When the timeout lapses, the provider's timeout call will execute */
static inline void
set_provider_timeout_absolute(struct auth_client *auth, uint32_t id, time_t timeout)
{
auth->data[id].timeout = timeout;
}
/* Get the timeout value for the provider */
static inline time_t
get_provider_timeout(struct auth_client *auth, uint32_t id)
{
return auth->data[id].timeout;
}
#endif /* __CHARYBDIS_AUTHD_PROVIDER_H__ */