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-rw-r--r--src/providers/krb5/krb5_auth.c22
-rw-r--r--src/providers/krb5/krb5_auth.h6
-rw-r--r--src/providers/krb5/krb5_common.h2
-rw-r--r--src/providers/krb5/krb5_wait_queue.c209
4 files changed, 239 insertions, 0 deletions
diff --git a/src/providers/krb5/krb5_auth.c b/src/providers/krb5/krb5_auth.c
index a0ac0e92..ce3dea76 100644
--- a/src/providers/krb5/krb5_auth.c
+++ b/src/providers/krb5/krb5_auth.c
@@ -1093,6 +1093,7 @@ void krb5_pam_handler(struct be_req *be_req)
struct pam_data *pd;
struct krb5_ctx *krb5_ctx;
int dp_err = DP_ERR_FATAL;
+ int ret;
pd = talloc_get_type(be_req->req_data, struct pam_data);
pd->pam_status = PAM_SYSTEM_ERR;
@@ -1108,6 +1109,19 @@ void krb5_pam_handler(struct be_req *be_req)
case SSS_CMD_RENEW:
case SSS_PAM_CHAUTHTOK_PRELIM:
case SSS_PAM_CHAUTHTOK:
+ ret = add_to_wait_queue(be_req, pd, krb5_ctx);
+ if (ret == EOK) {
+ DEBUG(7, ("Request successfully added to wait queue "
+ "of user [%s].\n", pd->user));
+ return;
+ } else if (ret == ENOENT) {
+ DEBUG(7, ("Wait queue of user [%s] is empty, "
+ "running request immediately.\n", pd->user));
+ } else {
+ DEBUG(7, ("Failed to add request to wait queue of user [%s], "
+ "running request immediately.\n", pd->user));
+ }
+
req = krb5_auth_send(be_req, be_req->be_ctx->ev, be_req->be_ctx, pd,
krb5_ctx);
if (req == NULL) {
@@ -1154,6 +1168,7 @@ void krb5_auth_done(struct tevent_req *req)
int pam_status;
int dp_err;
struct pam_data *pd;
+ struct krb5_ctx *krb5_ctx;
pd = talloc_get_type(be_req->req_data, struct pam_data);
@@ -1166,6 +1181,13 @@ void krb5_auth_done(struct tevent_req *req)
pd->pam_status = pam_status;
}
+ krb5_ctx = get_krb5_ctx(be_req);
+ if (krb5_ctx == NULL) {
+ DEBUG(1, ("Kerberos context not available.\n"));
+ }
+
+ check_wait_queue(krb5_ctx, pd->user);
+
krb_reply(be_req, dp_err, pd->pam_status);
}
diff --git a/src/providers/krb5/krb5_auth.h b/src/providers/krb5/krb5_auth.h
index 2f08ad9c..0d6318d1 100644
--- a/src/providers/krb5/krb5_auth.h
+++ b/src/providers/krb5/krb5_auth.h
@@ -66,6 +66,7 @@ struct tevent_req *krb5_auth_send(TALLOC_CTX *mem_ctx,
struct pam_data *pd,
struct krb5_ctx *krb5_ctx);
int krb5_auth_recv(struct tevent_req *req, int *pam_status, int *dp_err);
+void krb5_auth_done(struct tevent_req *req);
struct tevent_req *handle_child_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
@@ -93,4 +94,9 @@ struct tevent_req *krb5_access_send(TALLOC_CTX *mem_ctx,
struct pam_data *pd,
struct krb5_ctx *krb5_ctx);
int krb5_access_recv(struct tevent_req *req, bool *access_allowed);
+
+/* krb5_wait_queue.c */
+errno_t add_to_wait_queue(struct be_req *be_req, struct pam_data *pd,
+ struct krb5_ctx *krb5_ctx);
+void check_wait_queue(struct krb5_ctx *krb5_ctx, char *username);
#endif /* __KRB5_AUTH_H__ */
diff --git a/src/providers/krb5/krb5_common.h b/src/providers/krb5/krb5_common.h
index a6fdd8b8..c65ff74b 100644
--- a/src/providers/krb5/krb5_common.h
+++ b/src/providers/krb5/krb5_common.h
@@ -117,6 +117,8 @@ struct krb5_ctx {
struct deferred_auth_ctx *deferred_auth_ctx;
struct renew_tgt_ctx *renew_tgt_ctx;
bool use_fast;
+
+ hash_table_t *wait_queue_hash;
};
struct remove_info_files_ctx {
diff --git a/src/providers/krb5/krb5_wait_queue.c b/src/providers/krb5/krb5_wait_queue.c
new file mode 100644
index 00000000..3863b1bd
--- /dev/null
+++ b/src/providers/krb5/krb5_wait_queue.c
@@ -0,0 +1,209 @@
+/*
+ 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;
+}
+
generated by cgit (git 2.34.1) at 2024-11-16 17:48:09 +0000