1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "apr_strings.h"
18
19 #include "ap_config.h"
20 #include "ap_provider.h"
21 #include "httpd.h"
22 #include "http_config.h"
23 #include "http_core.h"
24 #include "http_log.h"
25 #include "http_protocol.h"
26 #include "http_request.h"
27
28 #include "mod_auth.h"
29
30 typedef struct {
31 int dummy; /* just here to stop compiler warnings for now. */
32 } authz_user_config_rec;
33
create_authz_user_dir_config(apr_pool_t * p,char * d)34 static void *create_authz_user_dir_config(apr_pool_t *p, char *d)
35 {
36 authz_user_config_rec *conf = apr_palloc(p, sizeof(*conf));
37
38 return conf;
39 }
40
41 static const command_rec authz_user_cmds[] =
42 {
43 {NULL}
44 };
45
46 module AP_MODULE_DECLARE_DATA authz_user_module;
47
user_check_authorization(request_rec * r,const char * require_args,const void * parsed_require_args)48 static authz_status user_check_authorization(request_rec *r,
49 const char *require_args,
50 const void *parsed_require_args)
51 {
52 const char *err = NULL;
53 const ap_expr_info_t *expr = parsed_require_args;
54 const char *require;
55
56 const char *t, *w;
57
58 if (!r->user) {
59 return AUTHZ_DENIED_NO_USER;
60 }
61
62 require = ap_expr_str_exec(r, expr, &err);
63 if (err) {
64 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02594)
65 "authz_user authorize: require user: Can't "
66 "evaluate require expression: %s", err);
67 return AUTHZ_DENIED;
68 }
69
70 t = require;
71 while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
72 if (!strcmp(r->user, w)) {
73 return AUTHZ_GRANTED;
74 }
75 }
76
77 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01663)
78 "access to %s failed, reason: user '%s' does not meet "
79 "'require'ments for user to be allowed access",
80 r->uri, r->user);
81
82 return AUTHZ_DENIED;
83 }
84
validuser_check_authorization(request_rec * r,const char * require_line,const void * parsed_require_line)85 static authz_status validuser_check_authorization(request_rec *r,
86 const char *require_line,
87 const void *parsed_require_line)
88 {
89 if (!r->user) {
90 return AUTHZ_DENIED_NO_USER;
91 }
92
93 return AUTHZ_GRANTED;
94 }
95
user_parse_config(cmd_parms * cmd,const char * require_line,const void ** parsed_require_line)96 static const char *user_parse_config(cmd_parms *cmd, const char *require_line,
97 const void **parsed_require_line)
98 {
99 const char *expr_err = NULL;
100 ap_expr_info_t *expr;
101
102 expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT,
103 &expr_err, NULL);
104
105 if (expr_err)
106 return apr_pstrcat(cmd->temp_pool,
107 "Cannot parse expression in require line: ",
108 expr_err, NULL);
109
110 *parsed_require_line = expr;
111
112 return NULL;
113 }
114
115 static const authz_provider authz_user_provider =
116 {
117 &user_check_authorization,
118 &user_parse_config,
119 };
120 static const authz_provider authz_validuser_provider =
121 {
122 &validuser_check_authorization,
123 NULL,
124 };
125
register_hooks(apr_pool_t * p)126 static void register_hooks(apr_pool_t *p)
127 {
128 ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "user",
129 AUTHZ_PROVIDER_VERSION,
130 &authz_user_provider, AP_AUTH_INTERNAL_PER_CONF);
131 ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "valid-user",
132 AUTHZ_PROVIDER_VERSION,
133 &authz_validuser_provider,
134 AP_AUTH_INTERNAL_PER_CONF);
135 }
136
137 AP_DECLARE_MODULE(authz_user) =
138 {
139 STANDARD20_MODULE_STUFF,
140 create_authz_user_dir_config, /* dir config creater */
141 NULL, /* dir merger --- default is to override */
142 NULL, /* server config */
143 NULL, /* merge server config */
144 authz_user_cmds, /* command apr_table_t */
145 register_hooks /* register hooks */
146 };
147