src/auth/db-ldap.h

	db-ldap.h revision 63cde222abaaa2a9bdaa9a143698dbc8b23bd742
#ifndef DB_LDAP_H
#define DB_LDAP_H

/* Functions like ldap_bind() have been deprecated in OpenLDAP 2.3
   This define enables them until the code here can be refactored */
#define LDAP_DEPRECATED 1

/* Maximum number of requests in queue. After this new requests are dropped. */
#define DB_LDAP_MAX_QUEUE_SIZE 1024
/* Maximum number of pending requests before delaying new requests. */
#define DB_LDAP_MAX_PENDING_REQUESTS 128
/* If LDAP connection is down, fail requests after waiting for this long. */
#define DB_LDAP_REQUEST_DISCONNECT_TIMEOUT_SECS 4
/* If request is still in queue after this many seconds and other requests
   have been replied, assume the request was lost and abort it. */
#define DB_LDAP_REQUEST_LOST_TIMEOUT_SECS 60
/* If server disconnects us, don't reconnect if no requests have been sent
   for this many seconds. */
#define DB_LDAP_IDLE_RECONNECT_SECS 60

#include <ldap.h>

struct auth_request;
struct ldap_connection;
struct ldap_request;

typedef void db_search_callback_t(struct ldap_connection *conn,
                  struct ldap_request *request,
                  LDAPMessage *res);

struct ldap_settings {
    const char *hosts;
    const char *uris;
    const char *dn;
    const char *dnpass;
    bool auth_bind;
    const char *auth_bind_userdn;

    bool tls;
    bool sasl_bind;
    const char *sasl_mech;
    const char *sasl_realm;
    const char *sasl_authz_id;

    const char *deref;
    const char *scope;
    const char *base;
    unsigned int ldap_version;

    const char *user_attrs;
    const char *user_filter;
    const char *pass_attrs;
    const char *pass_filter;

    const char *default_pass_scheme;

    /* ... */
    int ldap_deref, ldap_scope;
    uid_t uid;
    gid_t gid;
};

enum ldap_request_type {
    LDAP_REQUEST_TYPE_SEARCH,
    LDAP_REQUEST_TYPE_BIND
};

struct ldap_request {
    enum ldap_request_type type;

    /* msgid for sent requests, -1 if not sent */
    int msgid;
    /* timestamp when request was created */
    time_t create_time;

    db_search_callback_t *callback;
    struct auth_request *auth_request;
};

struct ldap_request_search {
    struct ldap_request request;

    const char *base;
    const char *filter;
    char **attributes; /* points to pass_attr_names / user_attr_names */
};

struct ldap_request_bind {
    struct ldap_request request;

    const char *dn;
};

enum ldap_connection_state {
    /* Not connected */
    LDAP_CONN_STATE_DISCONNECTED,
    /* Binding - either to default dn or doing auth bind */
    LDAP_CONN_STATE_BINDING,
    /* Bound to auth dn */
    LDAP_CONN_STATE_BOUND_AUTH,
    /* Bound to default dn */
    LDAP_CONN_STATE_BOUND_DEFAULT
};

struct ldap_connection {
    struct ldap_connection *next;

    pool_t pool;
    int refcount;

    char *config_path;
        struct ldap_settings set;

    LDAP *ld;
    enum ldap_connection_state conn_state;
    int default_bind_msgid;

    int fd;
    struct io *io;
    struct timeout *to;

    /* Request queue contains sent requests at tail (msgid != -1) and
       queued requests at head (msgid == -1). */
    struct aqueue *request_queue;
    ARRAY_DEFINE(request_array, struct ldap_request *);
    /* Number of messages in queue with msgid != -1 */
    unsigned int pending_count;

    /* Timestamp when we last received a reply */
    time_t last_reply_stamp;

    char **pass_attr_names, **user_attr_names;
    struct hash_table *pass_attr_map, *user_attr_map;
};

/* Send/queue request */
void db_ldap_request(struct ldap_connection *conn,
             struct ldap_request *request);

void db_ldap_set_attrs(struct ldap_connection *conn, const char *attrlist,
               char ***attr_names_r, struct hash_table *attr_map,
               const char *skip_attr);

struct ldap_connection *db_ldap_init(const char *config_path);
void db_ldap_unref(struct ldap_connection **conn);

int db_ldap_connect(struct ldap_connection *conn);

struct var_expand_table *
db_ldap_value_get_var_expand_table(struct auth_request *auth_request);

const char *ldap_escape(const char *str,
            const struct auth_request *auth_request);
const char *ldap_get_error(struct ldap_connection *conn);

struct db_ldap_result_iterate_context *
db_ldap_result_iterate_init(struct ldap_connection *conn, LDAPMessage *entry,
                struct auth_request *auth_request,
                struct hash_table *attr_map);
bool db_ldap_result_iterate_next(struct db_ldap_result_iterate_context *ctx,
                 const char **name_r, const char **value_r);
bool db_ldap_result_iterate_next_all(struct db_ldap_result_iterate_context *ctx,
                     const char **name_r,
                     const char *const **values_r);

#endif