Adding upstream version 2.4.38.upstream/2.4.38upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 409 insertions, 0 deletions

diff --git a/modules/aaa/mod_authz_dbd.c b/modules/aaa/mod_authz_dbd.c
new file mode 100644
index 0000000..e1bb623
--- /dev/null
+++ b/modules/aaa/mod_authz_dbd.c
@@ -0,0 +1,409 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "httpd.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "ap_provider.h"
+#include "http_request.h"
+#include "http_protocol.h"
+#include "http_core.h"
+#include "apr_dbd.h"
+#include "mod_dbd.h"
+#include "apr_strings.h"
+#include "mod_authz_dbd.h"
+
+#include "mod_auth.h"
+
+
+module AP_MODULE_DECLARE_DATA authz_dbd_module;
+
+/* Export a hook for modules that manage clientside sessions
+ * (e.g. mod_auth_cookie)
+ * to deal with those when we successfully login/logout at the server
+ *
+ * XXX: WHY would this be specific to dbd_authz?  Why wouldn't we track
+ * this across all authz user providers in a lower level mod, such as
+ * mod_auth_basic/digest?
+ */
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(authz_dbd, AUTHZ_DBD, int, client_login,
+                            (request_rec *r, int code, const char *action),
+                            (r, code, action), OK, DECLINED)
+
+
+typedef struct {
+    const char *query;
+    const char *redir_query;
+    int redirect;
+} authz_dbd_cfg ;
+
+static ap_dbd_t *(*dbd_handle)(request_rec*) = NULL;
+static void (*dbd_prepare)(server_rec*, const char*, const char*) = NULL;
+
+static const char *const noerror = "???";
+
+static void *authz_dbd_cr_cfg(apr_pool_t *pool, char *dummy)
+{
+    authz_dbd_cfg *ret = apr_pcalloc(pool, sizeof(authz_dbd_cfg));
+    ret->redirect = -1;
+    return ret;
+}
+
+static void *authz_dbd_merge_cfg(apr_pool_t *pool, void *BASE, void *ADD)
+{
+    authz_dbd_cfg *base = BASE;
+    authz_dbd_cfg *add = ADD;
+    authz_dbd_cfg *ret = apr_palloc(pool, sizeof(authz_dbd_cfg));
+
+    ret->query = (add->query == NULL) ? base->query : add->query;
+    ret->redir_query = (add->redir_query == NULL)
+                            ? base->redir_query : add->redir_query;
+    ret->redirect = (add->redirect == -1) ? base->redirect : add->redirect;
+    return ret;
+}
+
+static const char *authz_dbd_prepare(cmd_parms *cmd, void *cfg,
+                                     const char *query)
+{
+    static unsigned int label_num = 0;
+    char *label;
+    const char *err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS);
+    if (err)
+        return err;
+
+    if (dbd_prepare == NULL) {
+        dbd_prepare = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_prepare);
+        if (dbd_prepare == NULL) {
+            return "You must load mod_dbd to enable AuthzDBD functions";
+        }
+        dbd_handle = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire);
+    }
+    label = apr_psprintf(cmd->pool, "authz_dbd_%d", ++label_num);
+
+    dbd_prepare(cmd->server, query, label);
+
+    /* save the label here for our own use */
+    return ap_set_string_slot(cmd, cfg, label);
+}
+
+static const command_rec authz_dbd_cmds[] = {
+    AP_INIT_FLAG("AuthzDBDLoginToReferer", ap_set_flag_slot,
+                 (void*)APR_OFFSETOF(authz_dbd_cfg, redirect), ACCESS_CONF,
+                 "Whether to redirect to referer on successful login"),
+    AP_INIT_TAKE1("AuthzDBDQuery", authz_dbd_prepare,
+                  (void*)APR_OFFSETOF(authz_dbd_cfg, query), ACCESS_CONF,
+                  "SQL query for DBD Authz or login"),
+    AP_INIT_TAKE1("AuthzDBDRedirectQuery", authz_dbd_prepare,
+                  (void*)APR_OFFSETOF(authz_dbd_cfg, redir_query), ACCESS_CONF,
+                  "SQL query to get per-user redirect URL after login"),
+    {NULL}
+};
+
+static int authz_dbd_login(request_rec *r, authz_dbd_cfg *cfg,
+                           const char *action)
+{
+    int rv;
+    const char *newuri = NULL;
+    int nrows;
+    const char *message;
+    ap_dbd_t *dbd;
+    apr_dbd_prepared_t *query;
+    apr_dbd_results_t *res = NULL;
+    apr_dbd_row_t *row = NULL;
+
+    if (cfg->query == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01642)
+                      "No query configured for %s!", action);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+    
+    dbd = dbd_handle(r);
+    if (dbd == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02902)
+                      "No db handle available for %s! "
+                      "Check your database access",
+                      action);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    query = apr_hash_get(dbd->prepared, cfg->query, APR_HASH_KEY_STRING);
+    if (query == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01643)
+                      "Error retrieving Query for %s!", action);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    rv = apr_dbd_pvquery(dbd->driver, r->pool, dbd->handle, &nrows,
+                         query, r->user, NULL);
+    if (rv == 0) {
+        if (nrows != 1) {
+            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01644)
+                          "authz_dbd: %s of user %s updated %d rows",
+                          action, r->user, nrows);
+        }
+    }
+    else {
+        message = apr_dbd_error(dbd->driver, dbd->handle, rv);
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01645)
+                      "authz_dbd: query for %s failed; user %s [%s]",
+                      action, r->user, message?message:noerror);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    if (cfg->redirect == 1) {
+        newuri = apr_table_get(r->headers_in, "Referer");
+    }
+
+    if (!newuri && cfg->redir_query) {
+        query = apr_hash_get(dbd->prepared, cfg->redir_query,
+                             APR_HASH_KEY_STRING);
+        if (query == NULL) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01646)
+                          "authz_dbd: no redirect query!");
+            /* OK, this is non-critical; we can just not-redirect */
+        }
+        else if ((rv = apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle,
+                                        &res, query, 0, r->user, NULL)) == 0) {
+            for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
+                 rv != -1;
+                 rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
+                if (rv != 0) {
+                    message = apr_dbd_error(dbd->driver, dbd->handle, rv);
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01647)
+                          "authz_dbd in get_row; action=%s user=%s [%s]",
+                          action, r->user, message?message:noerror);
+                }
+                else if (newuri == NULL) {
+                    newuri =
+                        apr_pstrdup(r->pool,
+                                    apr_dbd_get_entry(dbd->driver, row, 0));
+                }
+                /* we can't break out here or row won't get cleaned up */
+            }
+        }
+        else {
+            message = apr_dbd_error(dbd->driver, dbd->handle, rv);
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01648)
+                          "authz_dbd/redirect for %s of %s [%s]",
+                          action, r->user, message?message:noerror);
+        }
+    }
+    if (newuri != NULL) {
+        r->status = HTTP_MOVED_TEMPORARILY;
+        apr_table_set(r->err_headers_out, "Location", newuri);
+    }
+    authz_dbd_run_client_login(r, OK, action);
+    return OK;
+}
+
+static int authz_dbd_group_query(request_rec *r, authz_dbd_cfg *cfg,
+                                 apr_array_header_t *groups)
+{
+    /* SELECT group FROM authz WHERE user = %s */
+    int rv;
+    const char *message;
+    ap_dbd_t *dbd;
+    apr_dbd_prepared_t *query;
+    apr_dbd_results_t *res = NULL;
+    apr_dbd_row_t *row = NULL;
+
+    if (cfg->query == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01649)
+                      "No query configured for dbd-group!");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+    
+    dbd = dbd_handle(r);
+    if (dbd == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02903)
+                      "No db handle available for dbd-query! "
+                      "Check your database access");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    query = apr_hash_get(dbd->prepared, cfg->query, APR_HASH_KEY_STRING);
+    if (query == NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01650)
+                      "Error retrieving query for dbd-group!");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+    rv = apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res,
+                          query, 0, r->user, NULL);
+    if (rv == 0) {
+        for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
+             rv != -1;
+             rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
+            if (rv == 0) {
+                APR_ARRAY_PUSH(groups, const char *) =
+                    apr_pstrdup(r->pool,
+                                apr_dbd_get_entry(dbd->driver, row, 0));
+            }
+            else {
+                message = apr_dbd_error(dbd->driver, dbd->handle, rv);
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01651)
+                        "authz_dbd in get_row; group query for user=%s [%s]",
+                        r->user, message?message:noerror);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+    }
+    else {
+        message = apr_dbd_error(dbd->driver, dbd->handle, rv);
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01652)
+                      "authz_dbd, in groups query for %s [%s]",
+                      r->user, message?message:noerror);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+    return OK;
+}
+
+static authz_status dbdgroup_check_authorization(request_rec *r,
+                                                 const char *require_args,
+                                                 const void *parsed_require_args)
+{
+    int rv;
+    const char *w;
+    apr_array_header_t *groups;
+
+    const char *err = NULL;
+    const ap_expr_info_t *expr = parsed_require_args;
+    const char *require;
+
+    const char *t;
+    authz_dbd_cfg *cfg = ap_get_module_config(r->per_dir_config,
+                                              &authz_dbd_module);
+
+    if (!r->user) {
+        return AUTHZ_DENIED_NO_USER;
+    }
+
+    groups = apr_array_make(r->pool, 4, sizeof(const char*));
+    rv = authz_dbd_group_query(r, cfg, groups);
+    if (rv != OK) {
+        return AUTHZ_GENERAL_ERROR;
+    }
+
+    require = ap_expr_str_exec(r, expr, &err);
+    if (err) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02590)
+                      "authz_dbd authorize: require dbd-group: Can't "
+                      "evaluate require expression: %s", err);
+        return AUTHZ_DENIED;
+    }
+
+    t = require;
+    while (t[0]) {
+        w = ap_getword_white(r->pool, &t);
+        if (ap_array_str_contains(groups, w)) {
+            return AUTHZ_GRANTED;
+        }
+    }
+
+    return AUTHZ_DENIED;
+}
+
+static authz_status dbdlogin_check_authorization(request_rec *r,
+                                                 const char *require_args,
+                                                 const void *parsed_require_args)
+{
+    authz_dbd_cfg *cfg = ap_get_module_config(r->per_dir_config,
+                                              &authz_dbd_module);
+
+    if (!r->user) {
+        return AUTHZ_DENIED_NO_USER;
+    }
+
+    return (authz_dbd_login(r, cfg, "login") == OK ? AUTHZ_GRANTED : AUTHZ_DENIED);
+}
+
+static authz_status dbdlogout_check_authorization(request_rec *r,
+                                                  const char *require_args,
+                                                  const void *parsed_require_args)
+{
+    authz_dbd_cfg *cfg = ap_get_module_config(r->per_dir_config,
+                                              &authz_dbd_module);
+
+    if (!r->user) {
+        return AUTHZ_DENIED_NO_USER;
+    }
+
+    return (authz_dbd_login(r, cfg, "logout") == OK ? AUTHZ_GRANTED : AUTHZ_DENIED);
+}
+
+static const char *dbd_parse_config(cmd_parms *cmd, const char *require_line,
+                                    const void **parsed_require_line)
+{
+    const char *expr_err = NULL;
+    ap_expr_info_t *expr;
+
+    expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT,
+                             &expr_err, NULL);
+
+    if (expr_err) {
+        return apr_pstrcat(cmd->temp_pool,
+                           "Cannot parse expression in require line: ",
+                           expr_err, NULL);
+    }
+
+    *parsed_require_line = expr;
+
+    return NULL;
+}
+
+static const authz_provider authz_dbdgroup_provider =
+{
+    &dbdgroup_check_authorization,
+    &dbd_parse_config,
+};
+
+static const authz_provider authz_dbdlogin_provider =
+{
+    &dbdlogin_check_authorization,
+    NULL,
+};
+
+static const authz_provider authz_dbdlogout_provider =
+{
+    &dbdlogout_check_authorization,
+    NULL,
+};
+
+static void authz_dbd_hooks(apr_pool_t *p)
+{
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "dbd-group",
+                              AUTHZ_PROVIDER_VERSION,
+                              &authz_dbdgroup_provider,
+                              AP_AUTH_INTERNAL_PER_CONF);
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "dbd-login",
+                              AUTHZ_PROVIDER_VERSION,
+                              &authz_dbdlogin_provider,
+                              AP_AUTH_INTERNAL_PER_CONF);
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "dbd-logout",
+                              AUTHZ_PROVIDER_VERSION,
+                              &authz_dbdlogout_provider,
+                              AP_AUTH_INTERNAL_PER_CONF);
+}
+
+AP_DECLARE_MODULE(authz_dbd) =
+{
+    STANDARD20_MODULE_STUFF,
+    authz_dbd_cr_cfg,
+    authz_dbd_merge_cfg,
+    NULL,
+    NULL,
+    authz_dbd_cmds,
+    authz_dbd_hooks
+};