1#include "base.h"
2#include "log.h"
3#include "buffer.h"
4
5#include "plugin.h"
6
7#include <ctype.h>
8#include <stdlib.h>
9#include <string.h>
10
11typedef struct {
12	array *access_deny;
13} plugin_config;
14
15typedef struct {
16	PLUGIN_DATA;
17
18	plugin_config **config_storage;
19
20	plugin_config conf;
21} plugin_data;
22
23INIT_FUNC(mod_access_init) {
24	plugin_data *p;
25
26	p = calloc(1, sizeof(*p));
27
28	return p;
29}
30
31FREE_FUNC(mod_access_free) {
32	plugin_data *p = p_d;
33
34	UNUSED(srv);
35
36	if (!p) return HANDLER_GO_ON;
37
38	if (p->config_storage) {
39		size_t i;
40		for (i = 0; i < srv->config_context->used; i++) {
41			plugin_config *s = p->config_storage[i];
42
43			if (NULL == s) continue;
44
45			array_free(s->access_deny);
46
47			free(s);
48		}
49		free(p->config_storage);
50	}
51
52	free(p);
53
54	return HANDLER_GO_ON;
55}
56
57SETDEFAULTS_FUNC(mod_access_set_defaults) {
58	plugin_data *p = p_d;
59	size_t i = 0;
60
61	config_values_t cv[] = {
62		{ "url.access-deny",             NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
63		{ NULL,                          NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
64	};
65
66	p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
67
68	for (i = 0; i < srv->config_context->used; i++) {
69		data_config const* config = (data_config const*)srv->config_context->data[i];
70		plugin_config *s;
71
72		s = calloc(1, sizeof(plugin_config));
73		s->access_deny    = array_init();
74
75		cv[0].destination = s->access_deny;
76
77		p->config_storage[i] = s;
78
79		if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
80			return HANDLER_ERROR;
81		}
82	}
83
84	return HANDLER_GO_ON;
85}
86
87#define PATCH(x) \
88	p->conf.x = s->x;
89static int mod_access_patch_connection(server *srv, connection *con, plugin_data *p) {
90	size_t i, j;
91	plugin_config *s = p->config_storage[0];
92
93	PATCH(access_deny);
94
95	/* skip the first, the global context */
96	for (i = 1; i < srv->config_context->used; i++) {
97		data_config *dc = (data_config *)srv->config_context->data[i];
98		s = p->config_storage[i];
99
100		/* condition didn't match */
101		if (!config_check_cond(srv, con, dc)) continue;
102
103		/* merge config */
104		for (j = 0; j < dc->value->used; j++) {
105			data_unset *du = dc->value->data[j];
106
107			if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.access-deny"))) {
108				PATCH(access_deny);
109			}
110		}
111	}
112
113	return 0;
114}
115#undef PATCH
116
117/**
118 * URI handler
119 *
120 * we will get called twice:
121 * - after the clean up of the URL and
122 * - after the pathinfo checks are done
123 *
124 * this handles the issue of trailing slashes
125 */
126URIHANDLER_FUNC(mod_access_uri_handler) {
127	plugin_data *p = p_d;
128	int s_len;
129	size_t k;
130
131	if (buffer_is_empty(con->uri.path)) return HANDLER_GO_ON;
132
133	mod_access_patch_connection(srv, con, p);
134
135	s_len = buffer_string_length(con->uri.path);
136
137	if (con->conf.log_request_handling) {
138		log_error_write(srv, __FILE__, __LINE__, "s",
139				"-- mod_access_uri_handler called");
140	}
141
142	for (k = 0; k < p->conf.access_deny->used; k++) {
143		data_string *ds = (data_string *)p->conf.access_deny->data[k];
144		int ct_len = buffer_string_length(ds->value);
145		int denied = 0;
146
147
148		if (ct_len > s_len) continue;
149		if (buffer_is_empty(ds->value)) continue;
150
151		/* if we have a case-insensitive FS we have to lower-case the URI here too */
152
153		if (con->conf.force_lowercase_filenames) {
154			if (0 == strncasecmp(con->uri.path->ptr + s_len - ct_len, ds->value->ptr, ct_len)) {
155				denied = 1;
156			}
157		} else {
158			if (0 == strncmp(con->uri.path->ptr + s_len - ct_len, ds->value->ptr, ct_len)) {
159				denied = 1;
160			}
161		}
162
163		if (denied) {
164			con->http_status = 403;
165			con->mode = DIRECT;
166
167			if (con->conf.log_request_handling) {
168	 			log_error_write(srv, __FILE__, __LINE__, "sb",
169					"url denied as we match:", ds->value);
170			}
171
172			return HANDLER_FINISHED;
173		}
174	}
175
176	/* not found */
177	return HANDLER_GO_ON;
178}
179
180
181int mod_access_plugin_init(plugin *p);
182int mod_access_plugin_init(plugin *p) {
183	p->version     = LIGHTTPD_VERSION_ID;
184	p->name        = buffer_init_string("access");
185
186	p->init        = mod_access_init;
187	p->set_defaults = mod_access_set_defaults;
188	p->handle_uri_clean = mod_access_uri_handler;
189	p->handle_subrequest_start  = mod_access_uri_handler;
190	p->cleanup     = mod_access_free;
191
192	p->data        = NULL;
193
194	return 0;
195}
196