1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
|
/*
Unix SMB/CIFS implementation.
web server startup
Copyright (C) Andrew Tridgell 2005
Copyright (C) Jelmer Vernooij 2008
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 "includes.h"
#include "web_server/web_server.h"
#include "../lib/util/dlinklist.h"
#include "lib/tls/tls.h"
#include "lib/events/events.h"
#include "lib/socket/netif.h"
#include "param/param.h"
NTSTATUS server_service_web_init(void);
/* don't allow connections to hang around forever */
#define HTTP_TIMEOUT 120
/*
destroy a web connection
*/
static int websrv_destructor(struct websrv_context *web)
{
return 0;
}
/*
called when a connection times out. This prevents a stuck connection
from hanging around forever
*/
static void websrv_timeout(struct tevent_context *event_context,
struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct websrv_context *web = talloc_get_type(private_data, struct websrv_context);
struct stream_connection *conn = web->conn;
web->conn = NULL;
/* TODO: send a message to any running esp context on this connection
to stop running */
stream_terminate_connection(conn, "websrv_timeout: timed out");
}
/*
setup for a raw http level error
*/
void http_error(struct websrv_context *web, const char *status, const char *info)
{
char *s;
s = talloc_asprintf(web,"<HTML><HEAD><TITLE>Error %s</TITLE></HEAD><BODY><H1>Error %s</H1><pre>%s</pre><p></BODY></HTML>\r\n\r\n",
status, status, info);
if (s == NULL) {
stream_terminate_connection(web->conn, "http_error: out of memory");
return;
}
websrv_output_headers(web, status, NULL);
websrv_output(web, s, strlen(s));
}
void websrv_output_headers(struct websrv_context *web, const char *status, struct http_header *headers)
{
char *s;
DATA_BLOB b;
struct http_header *hdr;
s = talloc_asprintf(web, "HTTP/1.0 %s\r\n", status);
if (s == NULL) return;
for (hdr = headers; hdr; hdr = hdr->next) {
s = talloc_asprintf_append_buffer(s, "%s: %s\r\n", hdr->name, hdr->value);
}
s = talloc_asprintf_append_buffer(s, "\r\n");
b = web->output.content;
web->output.content = data_blob_string_const(s);
websrv_output(web, b.data, b.length);
data_blob_free(&b);
}
void websrv_output(struct websrv_context *web, const void *data, size_t length)
{
data_blob_append(web, &web->output.content, data, length);
TEVENT_FD_NOT_READABLE(web->conn->event.fde);
TEVENT_FD_WRITEABLE(web->conn->event.fde);
web->output.output_pending = true;
}
/*
parse one line of header input
*/
NTSTATUS http_parse_header(struct websrv_context *web, const char *line)
{
if (line[0] == 0) {
web->input.end_of_headers = true;
} else if (strncasecmp(line,"GET ", 4)==0) {
web->input.url = talloc_strndup(web, &line[4], strcspn(&line[4], " \t"));
} else if (strncasecmp(line,"POST ", 5)==0) {
web->input.post_request = true;
web->input.url = talloc_strndup(web, &line[5], strcspn(&line[5], " \t"));
} else if (strchr(line, ':') == NULL) {
http_error(web, "400 Bad request", "This server only accepts GET and POST requests");
return NT_STATUS_INVALID_PARAMETER;
} else if (strncasecmp(line, "Content-Length: ", 16)==0) {
web->input.content_length = strtoul(&line[16], NULL, 10);
} else {
struct http_header *hdr = talloc_zero(web, struct http_header);
char *colon = strchr(line, ':');
if (colon == NULL) {
http_error(web, "500 Internal Server Error", "invalidly formatted header");
return NT_STATUS_INVALID_PARAMETER;
}
hdr->name = talloc_strndup(hdr, line, colon-line);
hdr->value = talloc_strdup(hdr, colon+1);
DLIST_ADD(web->input.headers, hdr);
}
/* ignore all other headers for now */
return NT_STATUS_OK;
}
/*
called when a web connection becomes readable
*/
static void websrv_recv(struct stream_connection *conn, uint16_t flags)
{
struct web_server_data *wdata;
struct websrv_context *web = talloc_get_type(conn->private_data,
struct websrv_context);
NTSTATUS status;
uint8_t buf[1024];
size_t nread;
uint8_t *p;
DATA_BLOB b;
/* not the most efficient http parser ever, but good enough for us */
status = socket_recv(conn->socket, buf, sizeof(buf), &nread);
if (NT_STATUS_IS_ERR(status)) goto failed;
if (!NT_STATUS_IS_OK(status)) return;
if (!data_blob_append(web, &web->input.partial, buf, nread))
goto failed;
/* parse any lines that are available */
b = web->input.partial;
while (!web->input.end_of_headers &&
(p=(uint8_t *)memchr(b.data, '\n', b.length))) {
const char *line = (const char *)b.data;
*p = 0;
if (p != b.data && p[-1] == '\r') {
p[-1] = 0;
}
status = http_parse_header(web, line);
if (!NT_STATUS_IS_OK(status)) return;
b.length -= (p - b.data) + 1;
b.data = p+1;
}
/* keep any remaining bytes in web->input.partial */
if (b.length == 0) {
b.data = NULL;
}
b = data_blob_talloc(web, b.data, b.length);
data_blob_free(&web->input.partial);
web->input.partial = b;
/* we finish when we have both the full headers (terminated by
a blank line) and any post data, as indicated by the
content_length */
if (web->input.end_of_headers &&
web->input.partial.length >= web->input.content_length) {
if (web->input.partial.length > web->input.content_length) {
web->input.partial.data[web->input.content_length] = 0;
}
TEVENT_FD_NOT_READABLE(web->conn->event.fde);
/* the reference/unlink code here is quite subtle. It
is needed because the rendering of the web-pages, and
in particular the esp/ejs backend, is semi-async. So
we could well end up in the connection timeout code
while inside http_process_input(), but we must not
destroy the stack variables being used by that
rendering process when we handle the timeout. */
if (!talloc_reference(web->task, web)) goto failed;
wdata = talloc_get_type(web->task->private_data, struct web_server_data);
if (wdata == NULL) goto failed;
wdata->http_process_input(wdata, web);
talloc_unlink(web->task, web);
}
return;
failed:
stream_terminate_connection(conn, "websrv_recv: failed");
}
/*
called when a web connection becomes writable
*/
static void websrv_send(struct stream_connection *conn, uint16_t flags)
{
struct websrv_context *web = talloc_get_type(conn->private_data,
struct websrv_context);
NTSTATUS status;
size_t nsent;
DATA_BLOB b;
b = web->output.content;
b.data += web->output.nsent;
b.length -= web->output.nsent;
status = socket_send(conn->socket, &b, &nsent);
if (NT_STATUS_IS_ERR(status)) {
stream_terminate_connection(web->conn, "socket_send: failed");
return;
}
if (!NT_STATUS_IS_OK(status)) {
return;
}
web->output.nsent += nsent;
if (web->output.content.length == web->output.nsent) {
stream_terminate_connection(web->conn, "websrv_send: finished sending");
}
}
/*
establish a new connection to the web server
*/
static void websrv_accept(struct stream_connection *conn)
{
struct web_server_data *wdata = talloc_get_type(conn->private_data, struct web_server_data);
struct websrv_context *web;
struct socket_context *tls_socket;
web = talloc_zero(conn, struct websrv_context);
if (web == NULL) goto failed;
web->task = wdata->task;
web->conn = conn;
conn->private_data = web;
talloc_set_destructor(web, websrv_destructor);
tevent_add_timer(conn->event.ctx, web,
timeval_current_ofs(HTTP_TIMEOUT, 0),
websrv_timeout, web);
/* Overwrite the socket with a (possibly) TLS socket */
tls_socket = tls_init_server(wdata->tls_params, conn->socket,
conn->event.fde, "GPHO");
/* We might not have TLS, or it might not have initilised */
if (tls_socket) {
talloc_unlink(conn, conn->socket);
talloc_steal(conn, tls_socket);
conn->socket = tls_socket;
} else {
DEBUG(3, ("TLS not available for web_server connections\n"));
}
return;
failed:
talloc_free(conn);
}
static const struct stream_server_ops web_stream_ops = {
.name = "web",
.accept_connection = websrv_accept,
.recv_handler = websrv_recv,
.send_handler = websrv_send,
};
/*
startup the web server task
*/
static void websrv_task_init(struct task_server *task)
{
NTSTATUS status;
uint16_t port = lpcfg_web_port(task->lp_ctx);
const struct model_ops *model_ops;
struct web_server_data *wdata;
task_server_set_title(task, "task[websrv]");
/* run the web server as a single process */
model_ops = process_model_startup("single");
if (!model_ops) goto failed;
/* startup the Python processor - unfortunately we can't do this
per connection as that wouldn't allow for session variables */
wdata = talloc_zero(task, struct web_server_data);
if (wdata == NULL) goto failed;
wdata->task = task;
task->private_data = wdata;
if (lpcfg_interfaces(task->lp_ctx) && lpcfg_bind_interfaces_only(task->lp_ctx)) {
int num_interfaces;
int i;
struct interface *ifaces;
load_interface_list(NULL, task->lp_ctx, &ifaces);
num_interfaces = iface_list_count(ifaces);
for(i = 0; i < num_interfaces; i++) {
const char *address = iface_list_n_ip(ifaces, i);
status = stream_setup_socket(task,
task->event_ctx,
task->lp_ctx, model_ops,
&web_stream_ops,
"ip", address,
&port, lpcfg_socket_options(task->lp_ctx),
task);
if (!NT_STATUS_IS_OK(status)) goto failed;
}
talloc_free(ifaces);
} else {
char **wcard;
int i;
wcard = iface_list_wildcard(task);
if (wcard == NULL) {
DEBUG(0,("No wildcard addresses available\n"));
goto failed;
}
for (i=0; wcard[i]; i++) {
status = stream_setup_socket(task, task->event_ctx,
task->lp_ctx, model_ops,
&web_stream_ops,
"ip", wcard[i],
&port, lpcfg_socket_options(task->lp_ctx),
wdata);
if (!NT_STATUS_IS_OK(status)) goto failed;
}
talloc_free(wcard);
}
wdata->tls_params = tls_initialise(wdata, task->lp_ctx);
if (wdata->tls_params == NULL) goto failed;
if (!wsgi_initialize(wdata)) goto failed;
return;
failed:
task_server_terminate(task, "websrv_task_init: failed to startup web server task", true);
}
/* called at smbd startup - register ourselves as a server service */
NTSTATUS server_service_web_init(void)
{
return register_server_service("web", websrv_task_init);
}
|
