diff options
Diffstat (limited to 'modules/aaa/mod_authz_owner.c')
| -rw-r--r-- | modules/aaa/mod_authz_owner.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/modules/aaa/mod_authz_owner.c b/modules/aaa/mod_authz_owner.c new file mode 100644 index 0000000..4fd0b2a --- /dev/null +++ b/modules/aaa/mod_authz_owner.c @@ -0,0 +1,189 @@ +/* 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 "apr_strings.h" +#include "apr_file_info.h" +#include "apr_user.h" + +#include "ap_config.h" +#include "ap_provider.h" +#include "httpd.h" +#include "http_config.h" +#include "http_core.h" +#include "http_log.h" +#include "http_protocol.h" +#include "http_request.h" + +#include "mod_auth.h" +#include "mod_authz_owner.h" + +static const command_rec authz_owner_cmds[] = +{ + {NULL} +}; + +module AP_MODULE_DECLARE_DATA authz_owner_module; + +static authz_status fileowner_check_authorization(request_rec *r, + const char *require_args, + const void *parsed_require_args) +{ + char *reason = NULL; + apr_status_t status = 0; + +#if !APR_HAS_USER + reason = "'Require file-owner' is not supported on this platform."; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01632) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; +#else /* APR_HAS_USER */ + char *owner = NULL; + apr_finfo_t finfo; + + if (!r->user) { + return AUTHZ_DENIED_NO_USER; + } + + if (!r->filename) { + reason = "no filename available"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01633) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; + } + + status = apr_stat(&finfo, r->filename, APR_FINFO_USER, r->pool); + if (status != APR_SUCCESS) { + reason = apr_pstrcat(r->pool, "could not stat file ", + r->filename, NULL); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01634) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; + } + + if (!(finfo.valid & APR_FINFO_USER)) { + reason = "no file owner information available"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01635) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; + } + + status = apr_uid_name_get(&owner, finfo.user, r->pool); + if (status != APR_SUCCESS || !owner) { + reason = "could not get name of file owner"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01636) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; + } + + if (strcmp(owner, r->user)) { + reason = apr_psprintf(r->pool, "file owner %s does not match.", + owner); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01637) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return AUTHZ_DENIED; + } + + /* this user is authorized */ + return AUTHZ_GRANTED; +#endif /* APR_HAS_USER */ +} + +static char *authz_owner_get_file_group(request_rec *r) +{ + /* file-group only figures out the file's group and lets + * other modules do the actual authorization (against a group file/db). + * Thus, these modules have to hook themselves after + * mod_authz_owner and of course recognize 'file-group', too. + */ +#if !APR_HAS_USER + return NULL; +#else /* APR_HAS_USER */ + char *reason = NULL; + char *group = NULL; + apr_finfo_t finfo; + apr_status_t status = 0; + + if (!r->filename) { + reason = "no filename available"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01638) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return NULL; + } + + status = apr_stat(&finfo, r->filename, APR_FINFO_GROUP, r->pool); + if (status != APR_SUCCESS) { + reason = apr_pstrcat(r->pool, "could not stat file ", + r->filename, NULL); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01639) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return NULL; + } + + if (!(finfo.valid & APR_FINFO_GROUP)) { + reason = "no file group information available"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01640) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return NULL; + } + + status = apr_gid_name_get(&group, finfo.group, r->pool); + if (status != APR_SUCCESS || !group) { + reason = "could not get name of file group"; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01641) + "Authorization of user %s to access %s failed, reason: %s", + r->user, r->uri, reason ? reason : "unknown"); + return NULL; + } + + return group; +#endif /* APR_HAS_USER */ +} + +static const authz_provider authz_fileowner_provider = +{ + &fileowner_check_authorization, + NULL, +}; + +static void register_hooks(apr_pool_t *p) +{ + APR_REGISTER_OPTIONAL_FN(authz_owner_get_file_group); + + ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "file-owner", + AUTHZ_PROVIDER_VERSION, + &authz_fileowner_provider, + AP_AUTH_INTERNAL_PER_CONF); +} + +AP_DECLARE_MODULE(authz_owner) = +{ + STANDARD20_MODULE_STUFF, + NULL, /* dir config creater */ + NULL, /* dir merger --- default is to override */ + NULL, /* server config */ + NULL, /* merge server config */ + authz_owner_cmds, /* command apr_table_t */ + register_hooks /* register hooks */ +}; |