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/*
SSSD
Kerberos 5 Backend Module - Serialize the request of a user
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2010 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <tevent.h>
#include <dhash.h>
#include "src/providers/krb5/krb5_auth.h"
#define INIT_HASH_SIZE 5
struct queue_entry {
struct queue_entry *prev;
struct queue_entry *next;
struct be_req *be_req;
struct pam_data *pd;
struct krb5_ctx *krb5_ctx;
};
static void wait_queue_auth(struct tevent_context *ev, struct tevent_timer *te,
struct timeval current_time, void *private_data)
{
struct queue_entry *queue_entry = talloc_get_type(private_data,
struct queue_entry);
struct tevent_req *req;
req = krb5_auth_send(queue_entry->be_req, queue_entry->be_req->be_ctx->ev,
queue_entry->be_req->be_ctx, queue_entry->pd,
queue_entry->krb5_ctx);
if (req == NULL) {
DEBUG(1, ("krb5_auth_send failed.\n"));
} else {
tevent_req_set_callback(req, krb5_auth_done, queue_entry->be_req);
}
talloc_zfree(queue_entry);
}
static void wait_queue_del_cb(hash_entry_t *entry, hash_destroy_enum type,
void *pvt)
{
struct queue_entry *head;
if (entry->value.type == HASH_VALUE_PTR) {
head = talloc_get_type(entry->value.ptr, struct queue_entry);
talloc_zfree(head);
return;
}
DEBUG(1, ("Unexpected value type [%d].\n", entry->value.type));
}
errno_t add_to_wait_queue(struct be_req *be_req, struct pam_data *pd,
struct krb5_ctx *krb5_ctx)
{
int ret;
hash_key_t key;
hash_value_t value;
struct queue_entry *head;
struct queue_entry *queue_entry;
if (krb5_ctx->wait_queue_hash == NULL) {
ret = sss_hash_create_ex(krb5_ctx, INIT_HASH_SIZE,
&krb5_ctx->wait_queue_hash, 0, 0, 0, 0,
wait_queue_del_cb, NULL);
if (ret != EOK) {
DEBUG(1, ("sss_hash_create failed"));
return ret;
}
}
key.type = HASH_KEY_STRING;
key.str = pd->user;
ret = hash_lookup(krb5_ctx->wait_queue_hash, &key, &value);
switch (ret) {
case HASH_SUCCESS:
if (value.type != HASH_VALUE_PTR) {
DEBUG(1, ("Unexpected hash value type.\n"));
return EINVAL;
}
head = talloc_get_type(value.ptr, struct queue_entry);
queue_entry = talloc_zero(head, struct queue_entry);
if (queue_entry == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
return ENOMEM;
}
queue_entry->be_req = be_req;
queue_entry->pd = pd;
queue_entry->krb5_ctx = krb5_ctx;
DLIST_ADD_END(head, queue_entry, struct queue_entry *);
break;
case HASH_ERROR_KEY_NOT_FOUND:
value.type = HASH_VALUE_PTR;
head = talloc_zero(krb5_ctx->wait_queue_hash, struct queue_entry);
if (head == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
return ENOMEM;
}
value.ptr = head;
ret = hash_enter(krb5_ctx->wait_queue_hash, &key, &value);
if (ret != HASH_SUCCESS) {
DEBUG(1, ("hash_enter failed.\n"));
talloc_free(head);
return EIO;
}
break;
default:
DEBUG(1, ("hash_lookup failed.\n"));
return EIO;
}
if (head->next == NULL) {
return ENOENT;
} else {
return EOK;
}
}
void check_wait_queue(struct krb5_ctx *krb5_ctx, char *username)
{
int ret;
hash_key_t key;
hash_value_t value;
struct queue_entry *head;
struct queue_entry *queue_entry;
struct tevent_timer *te;
if (krb5_ctx->wait_queue_hash == NULL) {
DEBUG(1, ("No wait queue available.\n"));
return;
}
key.type = HASH_KEY_STRING;
key.str = username;
ret = hash_lookup(krb5_ctx->wait_queue_hash, &key, &value);
switch (ret) {
case HASH_SUCCESS:
if (value.type != HASH_VALUE_PTR) {
DEBUG(1, ("Unexpected hash value type.\n"));
return;
}
head = talloc_get_type(value.ptr, struct queue_entry);
if (head->next == NULL) {
DEBUG(7, ("Wait queue for user [%s] is empty.\n", username));
} else {
queue_entry = head->next;
DLIST_REMOVE(head, queue_entry);
te = tevent_add_timer(queue_entry->be_req->be_ctx->ev, krb5_ctx,
tevent_timeval_current(), wait_queue_auth,
queue_entry);
if (te == NULL) {
DEBUG(1, ("tevent_add_timer failed.\n"));
} else {
return;
}
}
ret = hash_delete(krb5_ctx->wait_queue_hash, &key);
if (ret != HASH_SUCCESS) {
DEBUG(1, ("Failed to remove wait queue for user [%s].\n",
username));
}
break;
case HASH_ERROR_KEY_NOT_FOUND:
DEBUG(1, ("No wait queue for user [%s] found.\n", username));
break;
default:
DEBUG(1, ("hash_lookup failed.\n"));
}
return;
}
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