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1 d3a08f4d 2021-01-17 op /*
2 a555e0d6 2022-07-04 op * Copyright (c) 2021, 2022 Omar Polo <op@omarpolo.com>
3 d3a08f4d 2021-01-17 op *
4 d3a08f4d 2021-01-17 op * Permission to use, copy, modify, and distribute this software for any
5 d3a08f4d 2021-01-17 op * purpose with or without fee is hereby granted, provided that the above
6 d3a08f4d 2021-01-17 op * copyright notice and this permission notice appear in all copies.
7 d3a08f4d 2021-01-17 op *
8 d3a08f4d 2021-01-17 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 d3a08f4d 2021-01-17 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 d3a08f4d 2021-01-17 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 d3a08f4d 2021-01-17 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 d3a08f4d 2021-01-17 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 d3a08f4d 2021-01-17 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 d3a08f4d 2021-01-17 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 d3a08f4d 2021-01-17 op */
16 52418c8d 2021-02-12 op
17 52418c8d 2021-02-12 op #include "gmid.h"
18 d3a08f4d 2021-01-17 op
19 d3a08f4d 2021-01-17 op #include <sys/stat.h>
20 d29a2ee2 2022-09-06 op #include <sys/un.h>
21 d3a08f4d 2021-01-17 op
22 d3a08f4d 2021-01-17 op #include <assert.h>
23 efe7d180 2021-10-02 op #include <ctype.h>
24 d3a08f4d 2021-01-17 op #include <errno.h>
25 abc007d2 2021-02-08 op #include <event.h>
26 d3a08f4d 2021-01-17 op #include <fcntl.h>
27 b4d409cf 2021-01-21 op #include <fnmatch.h>
28 2fafa2d2 2021-02-01 op #include <limits.h>
29 d3a08f4d 2021-01-17 op #include <string.h>
30 090b8a89 2021-07-06 op
31 efe7d180 2021-10-02 op #define MIN(a, b) ((a) < (b) ? (a) : (b))
32 efe7d180 2021-10-02 op
33 090b8a89 2021-07-06 op int shutting_down;
34 d3a08f4d 2021-01-17 op
35 bc99d868 2021-03-19 op static struct tls *ctx;
36 abc007d2 2021-02-08 op
37 bc99d868 2021-03-19 op static struct event e4, e6, imsgev, siginfo, sigusr2;
38 6b191ed5 2021-02-23 op static int has_ipv6, has_siginfo;
39 abc007d2 2021-02-08 op
40 d3a08f4d 2021-01-17 op int connected_clients;
41 d3a08f4d 2021-01-17 op
42 49b73ba1 2021-02-10 op static inline int matches(const char*, const char*);
43 49b73ba1 2021-02-10 op
44 fe406389 2021-02-02 op static int check_path(struct client*, const char*, int*);
45 abc007d2 2021-02-08 op static void open_file(struct client*);
46 abc007d2 2021-02-08 op static void handle_handshake(int, short, void*);
47 91b9f2a8 2021-05-15 op static const char *strip_path(const char*, int);
48 57ec3e77 2021-02-08 op static void fmt_sbuf(const char*, struct client*, const char*);
49 abc007d2 2021-02-08 op static int apply_block_return(struct client*);
50 d474a979 2022-01-04 op static int check_matching_certificate(X509_STORE *, struct client *);
51 72b033ef 2021-12-29 op static int apply_reverse_proxy(struct client *);
52 efe7d180 2021-10-02 op static int apply_fastcgi(struct client*);
53 02be96c6 2021-02-09 op static int apply_require_ca(struct client*);
54 abc007d2 2021-02-08 op static void open_dir(struct client*);
55 abc007d2 2021-02-08 op static void redirect_canonical_dir(struct client*);
56 efe7d180 2021-10-02 op
57 efe7d180 2021-10-02 op static void client_tls_readcb(int, short, void *);
58 efe7d180 2021-10-02 op static void client_tls_writecb(int, short, void *);
59 efe7d180 2021-10-02 op
60 efe7d180 2021-10-02 op static void client_read(struct bufferevent *, void *);
61 efe7d180 2021-10-02 op void client_write(struct bufferevent *, void *);
62 efe7d180 2021-10-02 op static void client_error(struct bufferevent *, short, void *);
63 efe7d180 2021-10-02 op
64 efe7d180 2021-10-02 op static void client_close_ev(int, short, void *);
65 efe7d180 2021-10-02 op
66 abc007d2 2021-02-08 op static void do_accept(int, short, void*);
67 efe7d180 2021-10-02 op
68 efe7d180 2021-10-02 op static void handle_dispatch_imsg(int, short, void *);
69 bc99d868 2021-03-19 op static void handle_siginfo(int, short, void*);
70 bc99d868 2021-03-19 op
71 207b3e80 2021-10-07 op static uint32_t server_client_id;
72 207b3e80 2021-10-07 op
73 207b3e80 2021-10-07 op struct client_tree_id clients;
74 fe406389 2021-02-02 op
75 49b73ba1 2021-02-10 op static inline int
76 49b73ba1 2021-02-10 op matches(const char *pattern, const char *path)
77 49b73ba1 2021-02-10 op {
78 49b73ba1 2021-02-10 op if (*path == '/')
79 49b73ba1 2021-02-10 op path++;
80 49b73ba1 2021-02-10 op return !fnmatch(pattern, path, 0);
81 abc007d2 2021-02-08 op }
82 abc007d2 2021-02-08 op
83 c8b74339 2021-01-24 op const char *
84 c8b74339 2021-01-24 op vhost_lang(struct vhost *v, const char *path)
85 c8b74339 2021-01-24 op {
86 c8b74339 2021-01-24 op struct location *loc;
87 c8b74339 2021-01-24 op
88 caad0308 2021-01-27 op if (v == NULL || path == NULL)
89 6016a593 2021-01-30 op return NULL;
90 8443bff7 2021-01-25 op
91 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
92 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
93 534afd0d 2022-10-05 op if (*loc->lang != '\0') {
94 49b73ba1 2021-02-10 op if (matches(loc->match, path))
95 6016a593 2021-01-30 op return loc->lang;
96 c8b74339 2021-01-24 op }
97 c8b74339 2021-01-24 op }
98 c8b74339 2021-01-24 op
99 534afd0d 2022-10-05 op loc = TAILQ_FIRST(&v->locations);
100 534afd0d 2022-10-05 op if (*loc->lang == '\0')
101 534afd0d 2022-10-05 op return NULL;
102 534afd0d 2022-10-05 op return loc->lang;
103 c8b74339 2021-01-24 op }
104 c8b74339 2021-01-24 op
105 c8b74339 2021-01-24 op const char *
106 c8b74339 2021-01-24 op vhost_default_mime(struct vhost *v, const char *path)
107 c8b74339 2021-01-24 op {
108 c8b74339 2021-01-24 op struct location *loc;
109 c8b74339 2021-01-24 op const char *default_mime = "application/octet-stream";
110 caad0308 2021-01-27 op
111 caad0308 2021-01-27 op if (v == NULL || path == NULL)
112 caad0308 2021-01-27 op return default_mime;
113 c8b74339 2021-01-24 op
114 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
115 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
116 534afd0d 2022-10-05 op if (*loc->default_mime != '\0') {
117 49b73ba1 2021-02-10 op if (matches(loc->match, path))
118 6016a593 2021-01-30 op return loc->default_mime;
119 c8b74339 2021-01-24 op }
120 c8b74339 2021-01-24 op }
121 c8b74339 2021-01-24 op
122 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
123 534afd0d 2022-10-05 op if (*loc->default_mime != '\0')
124 b8e64ccd 2021-03-31 op return loc->default_mime;
125 c8b74339 2021-01-24 op return default_mime;
126 c8b74339 2021-01-24 op }
127 c8b74339 2021-01-24 op
128 c8b74339 2021-01-24 op const char *
129 c8b74339 2021-01-24 op vhost_index(struct vhost *v, const char *path)
130 c8b74339 2021-01-24 op {
131 c8b74339 2021-01-24 op struct location *loc;
132 c8b74339 2021-01-24 op const char *index = "index.gmi";
133 c8b74339 2021-01-24 op
134 caad0308 2021-01-27 op if (v == NULL || path == NULL)
135 caad0308 2021-01-27 op return index;
136 caad0308 2021-01-27 op
137 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
138 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
139 534afd0d 2022-10-05 op if (*loc->index != '\0') {
140 49b73ba1 2021-02-10 op if (matches(loc->match, path))
141 6016a593 2021-01-30 op return loc->index;
142 c8b74339 2021-01-24 op }
143 c8b74339 2021-01-24 op }
144 c8b74339 2021-01-24 op
145 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
146 534afd0d 2022-10-05 op if (*loc->index != '\0')
147 b8e64ccd 2021-03-31 op return loc->index;
148 c8b74339 2021-01-24 op return index;
149 c8b74339 2021-01-24 op }
150 c8b74339 2021-01-24 op
151 d3a08f4d 2021-01-17 op int
152 252908e6 2021-01-24 op vhost_auto_index(struct vhost *v, const char *path)
153 252908e6 2021-01-24 op {
154 252908e6 2021-01-24 op struct location *loc;
155 252908e6 2021-01-24 op
156 6016a593 2021-01-30 op if (v == NULL || path == NULL)
157 6016a593 2021-01-30 op return 0;
158 6016a593 2021-01-30 op
159 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
160 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
161 cd761624 2021-02-06 op if (loc->auto_index != 0) {
162 49b73ba1 2021-02-10 op if (matches(loc->match, path))
163 6016a593 2021-01-30 op return loc->auto_index == 1;
164 252908e6 2021-01-24 op }
165 252908e6 2021-01-24 op }
166 252908e6 2021-01-24 op
167 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
168 b8e64ccd 2021-03-31 op return loc->auto_index == 1;
169 6abda252 2021-02-06 op }
170 6abda252 2021-02-06 op
171 6abda252 2021-02-06 op int
172 6abda252 2021-02-06 op vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
173 6abda252 2021-02-06 op {
174 6abda252 2021-02-06 op struct location *loc;
175 6abda252 2021-02-06 op
176 6abda252 2021-02-06 op if (v == NULL || path == NULL)
177 6abda252 2021-02-06 op return 0;
178 6abda252 2021-02-06 op
179 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
180 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
181 cd761624 2021-02-06 op if (loc->block_code != 0) {
182 49b73ba1 2021-02-10 op if (matches(loc->match, path)) {
183 6abda252 2021-02-06 op *code = loc->block_code;
184 6abda252 2021-02-06 op *fmt = loc->block_fmt;
185 6abda252 2021-02-06 op return 1;
186 6abda252 2021-02-06 op }
187 6abda252 2021-02-06 op }
188 6abda252 2021-02-06 op }
189 6abda252 2021-02-06 op
190 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
191 b8e64ccd 2021-03-31 op *code = loc->block_code;
192 b8e64ccd 2021-03-31 op *fmt = loc->block_fmt;
193 b8e64ccd 2021-03-31 op return loc->block_code != 0;
194 72b033ef 2021-12-29 op }
195 72b033ef 2021-12-29 op
196 6abda252 2021-02-06 op int
197 8ad1c570 2021-05-09 op vhost_fastcgi(struct vhost *v, const char *path)
198 8ad1c570 2021-05-09 op {
199 8ad1c570 2021-05-09 op struct location *loc;
200 8ad1c570 2021-05-09 op
201 8ad1c570 2021-05-09 op if (v == NULL || path == NULL)
202 8ad1c570 2021-05-09 op return -1;
203 8ad1c570 2021-05-09 op
204 8ad1c570 2021-05-09 op loc = TAILQ_FIRST(&v->locations);
205 8ad1c570 2021-05-09 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
206 8ad1c570 2021-05-09 op if (loc->fcgi != -1)
207 8ad1c570 2021-05-09 op if (matches(loc->match, path))
208 8ad1c570 2021-05-09 op return loc->fcgi;
209 8ad1c570 2021-05-09 op }
210 8ad1c570 2021-05-09 op
211 8ad1c570 2021-05-09 op loc = TAILQ_FIRST(&v->locations);
212 8ad1c570 2021-05-09 op return loc->fcgi;
213 8ad1c570 2021-05-09 op }
214 8ad1c570 2021-05-09 op
215 8ad1c570 2021-05-09 op int
216 1feaf2a6 2021-05-15 op vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
217 fdea6aa0 2021-04-30 op {
218 fdea6aa0 2021-04-30 op struct location *loc;
219 1feaf2a6 2021-05-15 op size_t l = 0;
220 fdea6aa0 2021-04-30 op
221 fdea6aa0 2021-04-30 op if (v == NULL || path == NULL)
222 fdea6aa0 2021-04-30 op return -1;
223 fdea6aa0 2021-04-30 op
224 fdea6aa0 2021-04-30 op loc = TAILQ_FIRST(&v->locations);
225 fdea6aa0 2021-04-30 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
226 1feaf2a6 2021-05-15 op l++;
227 fdea6aa0 2021-04-30 op if (loc->dirfd != -1)
228 1feaf2a6 2021-05-15 op if (matches(loc->match, path)) {
229 1feaf2a6 2021-05-15 op *retloc = l;
230 fdea6aa0 2021-04-30 op return loc->dirfd;
231 1feaf2a6 2021-05-15 op }
232 fdea6aa0 2021-04-30 op }
233 fdea6aa0 2021-04-30 op
234 1feaf2a6 2021-05-15 op *retloc = 0;
235 fdea6aa0 2021-04-30 op loc = TAILQ_FIRST(&v->locations);
236 fdea6aa0 2021-04-30 op return loc->dirfd;
237 fdea6aa0 2021-04-30 op }
238 fdea6aa0 2021-04-30 op
239 fdea6aa0 2021-04-30 op int
240 6abda252 2021-02-06 op vhost_strip(struct vhost *v, const char *path)
241 6abda252 2021-02-06 op {
242 6abda252 2021-02-06 op struct location *loc;
243 6abda252 2021-02-06 op
244 6abda252 2021-02-06 op if (v == NULL || path == NULL)
245 6abda252 2021-02-06 op return 0;
246 6abda252 2021-02-06 op
247 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
248 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
249 cd761624 2021-02-06 op if (loc->strip != 0) {
250 49b73ba1 2021-02-10 op if (matches(loc->match, path))
251 6abda252 2021-02-06 op return loc->strip;
252 6abda252 2021-02-06 op }
253 6abda252 2021-02-06 op }
254 6abda252 2021-02-06 op
255 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
256 b8e64ccd 2021-03-31 op return loc->strip;
257 252908e6 2021-01-24 op }
258 252908e6 2021-01-24 op
259 02be96c6 2021-02-09 op X509_STORE *
260 02be96c6 2021-02-09 op vhost_require_ca(struct vhost *v, const char *path)
261 02be96c6 2021-02-09 op {
262 02be96c6 2021-02-09 op struct location *loc;
263 02be96c6 2021-02-09 op
264 02be96c6 2021-02-09 op if (v == NULL || path == NULL)
265 02be96c6 2021-02-09 op return NULL;
266 02be96c6 2021-02-09 op
267 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
268 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
269 02be96c6 2021-02-09 op if (loc->reqca != NULL) {
270 49b73ba1 2021-02-10 op if (matches(loc->match, path))
271 02be96c6 2021-02-09 op return loc->reqca;
272 02be96c6 2021-02-09 op }
273 02be96c6 2021-02-09 op }
274 02be96c6 2021-02-09 op
275 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
276 b8e64ccd 2021-03-31 op return loc->reqca;
277 793835cb 2021-02-23 op }
278 793835cb 2021-02-23 op
279 793835cb 2021-02-23 op int
280 793835cb 2021-02-23 op vhost_disable_log(struct vhost *v, const char *path)
281 793835cb 2021-02-23 op {
282 793835cb 2021-02-23 op struct location *loc;
283 793835cb 2021-02-23 op
284 793835cb 2021-02-23 op if (v == NULL || path == NULL)
285 793835cb 2021-02-23 op return 0;
286 793835cb 2021-02-23 op
287 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
288 b8e64ccd 2021-03-31 op while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
289 793835cb 2021-02-23 op if (loc->disable_log && matches(loc->match, path))
290 793835cb 2021-02-23 op return 1;
291 793835cb 2021-02-23 op }
292 793835cb 2021-02-23 op
293 b8e64ccd 2021-03-31 op loc = TAILQ_FIRST(&v->locations);
294 b8e64ccd 2021-03-31 op return loc->disable_log;
295 02be96c6 2021-02-09 op }
296 02be96c6 2021-02-09 op
297 fe406389 2021-02-02 op static int
298 d3a08f4d 2021-01-17 op check_path(struct client *c, const char *path, int *fd)
299 d3a08f4d 2021-01-17 op {
300 d3a08f4d 2021-01-17 op struct stat sb;
301 d1ca3911 2021-01-21 op const char *p;
302 efb48052 2021-07-27 op int dirfd, strip;
303 d3a08f4d 2021-01-17 op
304 d3a08f4d 2021-01-17 op assert(path != NULL);
305 d1ca3911 2021-01-21 op
306 fdea6aa0 2021-04-30 op /*
307 fdea6aa0 2021-04-30 op * in send_dir we add an initial / (to be redirect-friendly),
308 fdea6aa0 2021-04-30 op * but here we want to skip it
309 fdea6aa0 2021-04-30 op */
310 fdea6aa0 2021-04-30 op if (*path == '/')
311 fdea6aa0 2021-04-30 op path++;
312 fdea6aa0 2021-04-30 op
313 fdea6aa0 2021-04-30 op strip = vhost_strip(c->host, path);
314 fdea6aa0 2021-04-30 op p = strip_path(path, strip);
315 fdea6aa0 2021-04-30 op
316 fdea6aa0 2021-04-30 op if (*p == '/')
317 fdea6aa0 2021-04-30 op p = p+1;
318 fdea6aa0 2021-04-30 op if (*p == '\0')
319 d1ca3911 2021-01-21 op p = ".";
320 d1ca3911 2021-01-21 op
321 1feaf2a6 2021-05-15 op dirfd = vhost_dirfd(c->host, path, &c->loc);
322 fdea6aa0 2021-04-30 op log_debug(c, "check_path: strip=%d path=%s original=%s",
323 fdea6aa0 2021-04-30 op strip, p, path);
324 3bd4a6de 2022-07-04 op if (*fd == -1 && (*fd = openat(dirfd, p, O_RDONLY)) == -1) {
325 3bd4a6de 2022-07-04 op if (errno == EACCES)
326 3bd4a6de 2022-07-04 op log_info(c, "can't open %s: %s", p, strerror(errno));
327 d3a08f4d 2021-01-17 op return FILE_MISSING;
328 3bd4a6de 2022-07-04 op }
329 d3a08f4d 2021-01-17 op
330 d3a08f4d 2021-01-17 op if (fstat(*fd, &sb) == -1) {
331 3abf91b0 2021-02-07 op log_notice(c, "failed stat for %s: %s", path, strerror(errno));
332 d3a08f4d 2021-01-17 op return FILE_MISSING;
333 d3a08f4d 2021-01-17 op }
334 d3a08f4d 2021-01-17 op
335 d3a08f4d 2021-01-17 op if (S_ISDIR(sb.st_mode))
336 d3a08f4d 2021-01-17 op return FILE_DIRECTORY;
337 d3a08f4d 2021-01-17 op
338 d3a08f4d 2021-01-17 op return FILE_EXISTS;
339 d3a08f4d 2021-01-17 op }
340 d3a08f4d 2021-01-17 op
341 fe406389 2021-02-02 op static void
342 abc007d2 2021-02-08 op open_file(struct client *c)
343 d3a08f4d 2021-01-17 op {
344 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
345 d3a08f4d 2021-01-17 op case FILE_EXISTS:
346 efe7d180 2021-10-02 op c->type = REQUEST_FILE;
347 27b2fa9a 2021-02-12 op start_reply(c, SUCCESS, mime(c->host, c->iri.path));
348 07b0a142 2021-01-24 op return;
349 d3a08f4d 2021-01-17 op
350 d3a08f4d 2021-01-17 op case FILE_DIRECTORY:
351 abc007d2 2021-02-08 op open_dir(c);
352 07b0a142 2021-01-24 op return;
353 d3a08f4d 2021-01-17 op
354 d3a08f4d 2021-01-17 op case FILE_MISSING:
355 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
356 07b0a142 2021-01-24 op return;
357 d3a08f4d 2021-01-17 op
358 d3a08f4d 2021-01-17 op default:
359 d3a08f4d 2021-01-17 op /* unreachable */
360 d3a08f4d 2021-01-17 op abort();
361 252908e6 2021-01-24 op }
362 252908e6 2021-01-24 op }
363 252908e6 2021-01-24 op
364 9b8f5ed2 2021-02-03 op void
365 9b8f5ed2 2021-02-03 op mark_nonblock(int fd)
366 9b8f5ed2 2021-02-03 op {
367 9b8f5ed2 2021-02-03 op int flags;
368 9b8f5ed2 2021-02-03 op
369 9b8f5ed2 2021-02-03 op if ((flags = fcntl(fd, F_GETFL)) == -1)
370 9b8f5ed2 2021-02-03 op fatal("fcntl(F_GETFL): %s", strerror(errno));
371 9b8f5ed2 2021-02-03 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
372 9b8f5ed2 2021-02-03 op fatal("fcntl(F_SETFL): %s", strerror(errno));
373 9b8f5ed2 2021-02-03 op }
374 9b8f5ed2 2021-02-03 op
375 fe406389 2021-02-02 op static void
376 abc007d2 2021-02-08 op handle_handshake(int fd, short ev, void *d)
377 d3a08f4d 2021-01-17 op {
378 abc007d2 2021-02-08 op struct client *c = d;
379 d3a08f4d 2021-01-17 op struct vhost *h;
380 cc8c2901 2021-04-29 op struct alist *a;
381 d3a08f4d 2021-01-17 op const char *servname;
382 a8d4a897 2021-01-29 op const char *parse_err = "unknown error";
383 d3a08f4d 2021-01-17 op
384 d3a08f4d 2021-01-17 op switch (tls_handshake(c->ctx)) {
385 d3a08f4d 2021-01-17 op case 0: /* success */
386 d3a08f4d 2021-01-17 op case -1: /* already handshaked */
387 d3a08f4d 2021-01-17 op break;
388 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
389 efe7d180 2021-10-02 op event_once(c->fd, EV_READ, handle_handshake, c, NULL);
390 d3a08f4d 2021-01-17 op return;
391 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
392 efe7d180 2021-10-02 op event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
393 d3a08f4d 2021-01-17 op return;
394 d3a08f4d 2021-01-17 op default:
395 d3a08f4d 2021-01-17 op /* unreachable */
396 d3a08f4d 2021-01-17 op abort();
397 d3a08f4d 2021-01-17 op }
398 80444938 2021-10-15 op
399 80444938 2021-10-15 op c->bev = bufferevent_new(fd, client_read, client_write,
400 80444938 2021-10-15 op client_error, c);
401 80444938 2021-10-15 op if (c->bev == NULL)
402 80444938 2021-10-15 op fatal("%s: failed to allocate client buffer: %s",
403 80444938 2021-10-15 op __func__, strerror(errno));
404 d3a08f4d 2021-01-17 op
405 80444938 2021-10-15 op event_set(&c->bev->ev_read, c->fd, EV_READ,
406 80444938 2021-10-15 op client_tls_readcb, c->bev);
407 80444938 2021-10-15 op event_set(&c->bev->ev_write, c->fd, EV_WRITE,
408 80444938 2021-10-15 op client_tls_writecb, c->bev);
409 80444938 2021-10-15 op
410 80444938 2021-10-15 op #if HAVE_LIBEVENT2
411 80444938 2021-10-15 op evbuffer_unfreeze(c->bev->input, 0);
412 80444938 2021-10-15 op evbuffer_unfreeze(c->bev->output, 1);
413 80444938 2021-10-15 op #endif
414 80444938 2021-10-15 op
415 79288c8b 2021-09-24 op if ((servname = tls_conn_servername(c->ctx)) == NULL) {
416 79288c8b 2021-09-24 op log_debug(c, "handshake: missing SNI");
417 79288c8b 2021-09-24 op goto err;
418 79288c8b 2021-09-24 op }
419 79288c8b 2021-09-24 op
420 a8d4a897 2021-01-29 op if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
421 3abf91b0 2021-02-07 op log_info(c, "puny_decode: %s", parse_err);
422 a8d4a897 2021-01-29 op goto err;
423 a8d4a897 2021-01-29 op }
424 d3a08f4d 2021-01-17 op
425 b8e64ccd 2021-03-31 op TAILQ_FOREACH(h, &hosts, vhosts) {
426 eecad7a3 2021-02-12 op if (matches(h->domain, c->domain))
427 cc8c2901 2021-04-29 op goto found;
428 cc8c2901 2021-04-29 op TAILQ_FOREACH(a, &h->aliases, aliases) {
429 cc8c2901 2021-04-29 op if (matches(a->alias, c->domain))
430 cc8c2901 2021-04-29 op goto found;
431 cc8c2901 2021-04-29 op }
432 d3a08f4d 2021-01-17 op }
433 d3a08f4d 2021-01-17 op
434 cc8c2901 2021-04-29 op found:
435 3abf91b0 2021-02-07 op log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
436 3abf91b0 2021-02-07 op servname != NULL ? servname : "(null)",
437 3abf91b0 2021-02-07 op c->domain,
438 b8e64ccd 2021-03-31 op h != NULL ? h->domain : "(null)");
439 22c6d633 2021-01-27 op
440 b8e64ccd 2021-03-31 op if (h != NULL) {
441 d3a08f4d 2021-01-17 op c->host = h;
442 efe7d180 2021-10-02 op bufferevent_enable(c->bev, EV_READ);
443 d3a08f4d 2021-01-17 op return;
444 d3a08f4d 2021-01-17 op }
445 d3a08f4d 2021-01-17 op
446 a8d4a897 2021-01-29 op err:
447 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
448 6abda252 2021-02-06 op }
449 6abda252 2021-02-06 op
450 91b9f2a8 2021-05-15 op static const char *
451 91b9f2a8 2021-05-15 op strip_path(const char *path, int strip)
452 6abda252 2021-02-06 op {
453 57ec3e77 2021-02-08 op char *t;
454 6abda252 2021-02-06 op
455 6abda252 2021-02-06 op while (strip > 0) {
456 6abda252 2021-02-06 op if ((t = strchr(path, '/')) == NULL) {
457 6abda252 2021-02-06 op path = strchr(path, '\0');
458 6abda252 2021-02-06 op break;
459 6abda252 2021-02-06 op }
460 6abda252 2021-02-06 op path = t;
461 6abda252 2021-02-06 op strip--;
462 6abda252 2021-02-06 op }
463 57ec3e77 2021-02-08 op
464 57ec3e77 2021-02-08 op return path;
465 57ec3e77 2021-02-08 op }
466 57ec3e77 2021-02-08 op
467 57ec3e77 2021-02-08 op static void
468 57ec3e77 2021-02-08 op fmt_sbuf(const char *fmt, struct client *c, const char *path)
469 57ec3e77 2021-02-08 op {
470 57ec3e77 2021-02-08 op size_t i;
471 4842c72d 2021-10-18 op char buf[32];
472 6abda252 2021-02-06 op
473 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
474 6abda252 2021-02-06 op for (i = 0; *fmt; ++fmt) {
475 6abda252 2021-02-06 op if (i == sizeof(buf)-1 || *fmt == '%') {
476 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
477 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
478 6abda252 2021-02-06 op i = 0;
479 6abda252 2021-02-06 op }
480 6abda252 2021-02-06 op
481 6abda252 2021-02-06 op if (*fmt != '%') {
482 6abda252 2021-02-06 op buf[i++] = *fmt;
483 6abda252 2021-02-06 op continue;
484 6abda252 2021-02-06 op }
485 6abda252 2021-02-06 op
486 6abda252 2021-02-06 op switch (*++fmt) {
487 6abda252 2021-02-06 op case '%':
488 6abda252 2021-02-06 op strlcat(c->sbuf, "%", sizeof(c->sbuf));
489 6abda252 2021-02-06 op break;
490 6abda252 2021-02-06 op case 'p':
491 737a6b50 2021-04-30 op if (*path != '/')
492 737a6b50 2021-04-30 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
493 6abda252 2021-02-06 op strlcat(c->sbuf, path, sizeof(c->sbuf));
494 6abda252 2021-02-06 op break;
495 6abda252 2021-02-06 op case 'q':
496 6abda252 2021-02-06 op strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
497 6abda252 2021-02-06 op break;
498 6abda252 2021-02-06 op case 'P':
499 6abda252 2021-02-06 op snprintf(buf, sizeof(buf), "%d", conf.port);
500 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
501 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
502 6abda252 2021-02-06 op break;
503 6abda252 2021-02-06 op case 'N':
504 6abda252 2021-02-06 op strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
505 6abda252 2021-02-06 op break;
506 6abda252 2021-02-06 op default:
507 6abda252 2021-02-06 op fatal("%s: unknown fmt specifier %c",
508 6abda252 2021-02-06 op __func__, *fmt);
509 6abda252 2021-02-06 op }
510 6abda252 2021-02-06 op }
511 6abda252 2021-02-06 op
512 6abda252 2021-02-06 op if (i != 0)
513 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
514 57ec3e77 2021-02-08 op }
515 6abda252 2021-02-06 op
516 57ec3e77 2021-02-08 op /* 1 if a matching `block return' (and apply it), 0 otherwise */
517 57ec3e77 2021-02-08 op static int
518 57ec3e77 2021-02-08 op apply_block_return(struct client *c)
519 57ec3e77 2021-02-08 op {
520 57ec3e77 2021-02-08 op const char *fmt, *path;
521 57ec3e77 2021-02-08 op int code;
522 57ec3e77 2021-02-08 op
523 57ec3e77 2021-02-08 op if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
524 57ec3e77 2021-02-08 op return 0;
525 57ec3e77 2021-02-08 op
526 57ec3e77 2021-02-08 op path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
527 57ec3e77 2021-02-08 op fmt_sbuf(fmt, c, path);
528 57ec3e77 2021-02-08 op
529 abc007d2 2021-02-08 op start_reply(c, code, c->sbuf);
530 72b033ef 2021-12-29 op return 1;
531 b7967bc1 2021-01-02 op }
532 b7967bc1 2021-01-02 op
533 b7967bc1 2021-01-02 op static struct proxy *
534 b7967bc1 2021-01-02 op matched_proxy(struct client *c)
535 b7967bc1 2021-01-02 op {
536 b7967bc1 2021-01-02 op struct proxy *p;
537 b7967bc1 2021-01-02 op const char *proto;
538 b7967bc1 2021-01-02 op const char *host;
539 b7967bc1 2021-01-02 op const char *port;
540 b7967bc1 2021-01-02 op
541 b7967bc1 2021-01-02 op TAILQ_FOREACH(p, &c->host->proxies, proxies) {
542 534afd0d 2022-10-05 op if (*(proto = p->match_proto) == '\0')
543 b7967bc1 2021-01-02 op proto = "gemini";
544 534afd0d 2022-10-05 op if (*(host = p->match_host) == '\0')
545 b7967bc1 2021-01-02 op host = "*";
546 534afd0d 2022-10-05 op if (*(port = p->match_port) == '\0')
547 b7967bc1 2021-01-02 op port = "*";
548 b7967bc1 2021-01-02 op
549 b7967bc1 2021-01-02 op if (matches(proto, c->iri.schema) &&
550 b7967bc1 2021-01-02 op matches(host, c->domain) &&
551 b7967bc1 2021-01-02 op matches(port, c->iri.port))
552 b7967bc1 2021-01-02 op return p;
553 b7967bc1 2021-01-02 op }
554 b7967bc1 2021-01-02 op
555 b7967bc1 2021-01-02 op return NULL;
556 ba94a608 2022-01-04 op }
557 ba94a608 2022-01-04 op
558 ba94a608 2022-01-04 op static int
559 ba94a608 2022-01-04 op check_matching_certificate(X509_STORE *store, struct client *c)
560 ba94a608 2022-01-04 op {
561 ba94a608 2022-01-04 op const uint8_t *cert;
562 ba94a608 2022-01-04 op size_t len;
563 ba94a608 2022-01-04 op
564 ba94a608 2022-01-04 op if (!tls_peer_cert_provided(c->ctx)) {
565 ba94a608 2022-01-04 op start_reply(c, CLIENT_CERT_REQ, "client certificate required");
566 ba94a608 2022-01-04 op return 1;
567 ba94a608 2022-01-04 op }
568 ba94a608 2022-01-04 op
569 ba94a608 2022-01-04 op cert = tls_peer_cert_chain_pem(c->ctx, &len);
570 ba94a608 2022-01-04 op if (!validate_against_ca(store, cert, len)) {
571 ba94a608 2022-01-04 op start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
572 ba94a608 2022-01-04 op return 1;
573 ba94a608 2022-01-04 op }
574 ba94a608 2022-01-04 op
575 ba94a608 2022-01-04 op return 0;
576 72b033ef 2021-12-29 op }
577 72b033ef 2021-12-29 op
578 d29a2ee2 2022-09-06 op static int
579 d29a2ee2 2022-09-06 op proxy_socket(struct client *c, const char *host, const char *port)
580 d29a2ee2 2022-09-06 op {
581 d29a2ee2 2022-09-06 op struct addrinfo hints, *res, *res0;
582 d29a2ee2 2022-09-06 op int r, sock;
583 d29a2ee2 2022-09-06 op
584 d29a2ee2 2022-09-06 op memset(&hints, 0, sizeof(hints));
585 d29a2ee2 2022-09-06 op hints.ai_family = AF_UNSPEC;
586 d29a2ee2 2022-09-06 op hints.ai_socktype = SOCK_STREAM;
587 d29a2ee2 2022-09-06 op
588 d29a2ee2 2022-09-06 op /* XXX: asr_run? :> */
589 d29a2ee2 2022-09-06 op r = getaddrinfo(host, port, &hints, &res0);
590 d29a2ee2 2022-09-06 op if (r != 0) {
591 d29a2ee2 2022-09-06 op log_warn(c, "getaddrinfo(\"%s\", \"%s\"): %s",
592 d29a2ee2 2022-09-06 op host, port, gai_strerror(r));
593 d29a2ee2 2022-09-06 op return -1;
594 d29a2ee2 2022-09-06 op }
595 d29a2ee2 2022-09-06 op
596 d29a2ee2 2022-09-06 op for (res = res0; res; res = res->ai_next) {
597 d29a2ee2 2022-09-06 op sock = socket(res->ai_family, res->ai_socktype,
598 d29a2ee2 2022-09-06 op res->ai_protocol);
599 d29a2ee2 2022-09-06 op if (sock == -1)
600 d29a2ee2 2022-09-06 op continue;
601 d29a2ee2 2022-09-06 op
602 d29a2ee2 2022-09-06 op if (connect(sock, res->ai_addr, res->ai_addrlen) == -1) {
603 d29a2ee2 2022-09-06 op close(sock);
604 d29a2ee2 2022-09-06 op sock = -1;
605 d29a2ee2 2022-09-06 op continue;
606 d29a2ee2 2022-09-06 op }
607 d29a2ee2 2022-09-06 op
608 d29a2ee2 2022-09-06 op break;
609 d29a2ee2 2022-09-06 op }
610 d29a2ee2 2022-09-06 op
611 d29a2ee2 2022-09-06 op freeaddrinfo(res0);
612 d29a2ee2 2022-09-06 op
613 d29a2ee2 2022-09-06 op if (sock == -1)
614 d29a2ee2 2022-09-06 op log_warn(c, "can't connect to %s:%s", host, port);
615 d29a2ee2 2022-09-06 op
616 d29a2ee2 2022-09-06 op return sock;
617 d29a2ee2 2022-09-06 op }
618 d29a2ee2 2022-09-06 op
619 72b033ef 2021-12-29 op /* 1 if matching a proxy relay-to (and apply it), 0 otherwise */
620 72b033ef 2021-12-29 op static int
621 72b033ef 2021-12-29 op apply_reverse_proxy(struct client *c)
622 72b033ef 2021-12-29 op {
623 7bdcc91e 2021-01-01 op struct proxy *p;
624 72b033ef 2021-12-29 op
625 b7967bc1 2021-01-02 op if ((p = matched_proxy(c)) == NULL)
626 72b033ef 2021-12-29 op return 0;
627 d49093c1 2021-01-01 op
628 b7967bc1 2021-01-02 op c->proxy = p;
629 b7967bc1 2021-01-02 op
630 ba94a608 2022-01-04 op if (p->reqca != NULL && check_matching_certificate(p->reqca, c))
631 ba94a608 2022-01-04 op return 1;
632 ba94a608 2022-01-04 op
633 72b033ef 2021-12-29 op log_debug(c, "opening proxy connection for %s:%s",
634 7bdcc91e 2021-01-01 op p->host, p->port);
635 7bdcc91e 2021-01-01 op
636 d29a2ee2 2022-09-06 op if ((c->pfd = proxy_socket(c, p->host, p->port)) == -1) {
637 d29a2ee2 2022-09-06 op start_reply(c, PROXY_ERROR, "proxy error");
638 d29a2ee2 2022-09-06 op return 1;
639 d29a2ee2 2022-09-06 op }
640 72b033ef 2021-12-29 op
641 d29a2ee2 2022-09-06 op mark_nonblock(c->pfd);
642 d29a2ee2 2022-09-06 op if (proxy_init(c) == -1)
643 d29a2ee2 2022-09-06 op start_reply(c, PROXY_ERROR, "proxy error");
644 72b033ef 2021-12-29 op
645 8ad1c570 2021-05-09 op return 1;
646 8ad1c570 2021-05-09 op }
647 8ad1c570 2021-05-09 op
648 d29a2ee2 2022-09-06 op static int
649 d29a2ee2 2022-09-06 op fcgi_open_sock(struct fcgi *f)
650 d29a2ee2 2022-09-06 op {
651 d29a2ee2 2022-09-06 op struct sockaddr_un addr;
652 d29a2ee2 2022-09-06 op int fd;
653 d29a2ee2 2022-09-06 op
654 d29a2ee2 2022-09-06 op if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
655 d29a2ee2 2022-09-06 op log_err(NULL, "socket: %s", strerror(errno));
656 d29a2ee2 2022-09-06 op return -1;
657 d29a2ee2 2022-09-06 op }
658 d29a2ee2 2022-09-06 op
659 d29a2ee2 2022-09-06 op memset(&addr, 0, sizeof(addr));
660 d29a2ee2 2022-09-06 op addr.sun_family = AF_UNIX;
661 d29a2ee2 2022-09-06 op strlcpy(addr.sun_path, f->path, sizeof(addr.sun_path));
662 d29a2ee2 2022-09-06 op
663 d29a2ee2 2022-09-06 op if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
664 d29a2ee2 2022-09-06 op log_warn(NULL, "failed to connect to %s: %s", f->path,
665 d29a2ee2 2022-09-06 op strerror(errno));
666 d29a2ee2 2022-09-06 op close(fd);
667 d29a2ee2 2022-09-06 op return -1;
668 d29a2ee2 2022-09-06 op }
669 d29a2ee2 2022-09-06 op
670 d29a2ee2 2022-09-06 op return fd;
671 d29a2ee2 2022-09-06 op }
672 d29a2ee2 2022-09-06 op
673 d29a2ee2 2022-09-06 op static int
674 d29a2ee2 2022-09-06 op fcgi_open_conn(struct fcgi *f)
675 d29a2ee2 2022-09-06 op {
676 d29a2ee2 2022-09-06 op struct addrinfo hints, *servinfo, *p;
677 d29a2ee2 2022-09-06 op int r, sock;
678 d29a2ee2 2022-09-06 op
679 d29a2ee2 2022-09-06 op memset(&hints, 0, sizeof(hints));
680 d29a2ee2 2022-09-06 op hints.ai_family = AF_UNSPEC;
681 d29a2ee2 2022-09-06 op hints.ai_socktype = SOCK_STREAM;
682 d29a2ee2 2022-09-06 op hints.ai_flags = AI_ADDRCONFIG;
683 d29a2ee2 2022-09-06 op
684 d29a2ee2 2022-09-06 op if ((r = getaddrinfo(f->path, f->port, &hints, &servinfo)) != 0) {
685 d29a2ee2 2022-09-06 op log_warn(NULL, "getaddrinfo %s:%s: %s", f->path, f->port,
686 d29a2ee2 2022-09-06 op gai_strerror(r));
687 d29a2ee2 2022-09-06 op return -1;
688 d29a2ee2 2022-09-06 op }
689 d29a2ee2 2022-09-06 op
690 d29a2ee2 2022-09-06 op for (p = servinfo; p != NULL; p = p->ai_next) {
691 d29a2ee2 2022-09-06 op sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
692 d29a2ee2 2022-09-06 op if (sock == -1)
693 d29a2ee2 2022-09-06 op continue;
694 d29a2ee2 2022-09-06 op if (connect(sock, p->ai_addr, p->ai_addrlen) == -1) {
695 d29a2ee2 2022-09-06 op close(sock);
696 d29a2ee2 2022-09-06 op continue;
697 d29a2ee2 2022-09-06 op }
698 d29a2ee2 2022-09-06 op break;
699 d29a2ee2 2022-09-06 op }
700 d29a2ee2 2022-09-06 op
701 d29a2ee2 2022-09-06 op if (p == NULL) {
702 d29a2ee2 2022-09-06 op log_warn(NULL, "couldn't connect to %s:%s", f->path, f->port);
703 d29a2ee2 2022-09-06 op sock = -1;
704 d29a2ee2 2022-09-06 op }
705 d29a2ee2 2022-09-06 op
706 d29a2ee2 2022-09-06 op freeaddrinfo(servinfo);
707 d29a2ee2 2022-09-06 op return sock;
708 d29a2ee2 2022-09-06 op }
709 d29a2ee2 2022-09-06 op
710 8ad1c570 2021-05-09 op /* 1 if matching `fcgi' (and apply it), 0 otherwise */
711 8ad1c570 2021-05-09 op static int
712 8ad1c570 2021-05-09 op apply_fastcgi(struct client *c)
713 8ad1c570 2021-05-09 op {
714 8ad1c570 2021-05-09 op int id;
715 8ad1c570 2021-05-09 op struct fcgi *f;
716 8ad1c570 2021-05-09 op
717 8ad1c570 2021-05-09 op if ((id = vhost_fastcgi(c->host, c->iri.path)) == -1)
718 8ad1c570 2021-05-09 op return 0;
719 8ad1c570 2021-05-09 op
720 4cd25209 2021-10-07 op f = &fcgi[id];
721 4cd25209 2021-10-07 op
722 d29a2ee2 2022-09-06 op log_debug(c, "opening fastcgi connection for (%s,%s)",
723 d29a2ee2 2022-09-06 op f->path, f->port);
724 8ad1c570 2021-05-09 op
725 534afd0d 2022-10-05 op if (*f->port != '\0')
726 d29a2ee2 2022-09-06 op c->pfd = fcgi_open_sock(f);
727 d29a2ee2 2022-09-06 op else
728 d29a2ee2 2022-09-06 op c->pfd = fcgi_open_conn(f);
729 d29a2ee2 2022-09-06 op
730 d29a2ee2 2022-09-06 op if (c->pfd == -1) {
731 d29a2ee2 2022-09-06 op start_reply(c, CGI_ERROR, "CGI error");
732 d29a2ee2 2022-09-06 op return 1;
733 d29a2ee2 2022-09-06 op }
734 d29a2ee2 2022-09-06 op
735 d29a2ee2 2022-09-06 op mark_nonblock(c->pfd);
736 d29a2ee2 2022-09-06 op
737 d29a2ee2 2022-09-06 op c->cgibev = bufferevent_new(c->pfd, fcgi_read, fcgi_write,
738 d29a2ee2 2022-09-06 op fcgi_error, c);
739 d29a2ee2 2022-09-06 op if (c->cgibev == NULL) {
740 d29a2ee2 2022-09-06 op start_reply(c, TEMP_FAILURE, "internal server error");
741 d29a2ee2 2022-09-06 op return 1;
742 d29a2ee2 2022-09-06 op }
743 d29a2ee2 2022-09-06 op
744 d29a2ee2 2022-09-06 op bufferevent_enable(c->cgibev, EV_READ|EV_WRITE);
745 d29a2ee2 2022-09-06 op fcgi_req(c);
746 d29a2ee2 2022-09-06 op
747 6abda252 2021-02-06 op return 1;
748 d3a08f4d 2021-01-17 op }
749 d3a08f4d 2021-01-17 op
750 02be96c6 2021-02-09 op /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
751 02be96c6 2021-02-09 op static int
752 02be96c6 2021-02-09 op apply_require_ca(struct client *c)
753 02be96c6 2021-02-09 op {
754 02be96c6 2021-02-09 op X509_STORE *store;
755 02be96c6 2021-02-09 op
756 02be96c6 2021-02-09 op if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
757 02be96c6 2021-02-09 op return 0;
758 ba94a608 2022-01-04 op return check_matching_certificate(store, c);
759 02be96c6 2021-02-09 op }
760 02be96c6 2021-02-09 op
761 fe406389 2021-02-02 op static void
762 abc007d2 2021-02-08 op open_dir(struct client *c)
763 d3a08f4d 2021-01-17 op {
764 d3a08f4d 2021-01-17 op size_t len;
765 11c98667 2021-04-25 op int dirfd, root;
766 252908e6 2021-01-24 op char *before_file;
767 11c98667 2021-04-25 op
768 d29a2ee2 2022-09-06 op log_debug(c, "in open_dir");
769 d29a2ee2 2022-09-06 op
770 11c98667 2021-04-25 op root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
771 d1ca3911 2021-01-21 op
772 0be51733 2021-01-20 op len = strlen(c->iri.path);
773 252908e6 2021-01-24 op if (len > 0 && !ends_with(c->iri.path, "/")) {
774 abc007d2 2021-02-08 op redirect_canonical_dir(c);
775 0be51733 2021-01-20 op return;
776 d3a08f4d 2021-01-17 op }
777 d3a08f4d 2021-01-17 op
778 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
779 d1ca3911 2021-01-21 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
780 d1ca3911 2021-01-21 op if (!ends_with(c->sbuf, "/"))
781 0be51733 2021-01-20 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
782 252908e6 2021-01-24 op before_file = strchr(c->sbuf, '\0');
783 c8b74339 2021-01-24 op len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
784 c8b74339 2021-01-24 op sizeof(c->sbuf));
785 252908e6 2021-01-24 op if (len >= sizeof(c->sbuf)) {
786 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
787 252908e6 2021-01-24 op return;
788 252908e6 2021-01-24 op }
789 d3a08f4d 2021-01-17 op
790 252908e6 2021-01-24 op c->iri.path = c->sbuf;
791 252908e6 2021-01-24 op
792 252908e6 2021-01-24 op /* close later unless we have to generate the dir listing */
793 abc007d2 2021-02-08 op dirfd = c->pfd;
794 abc007d2 2021-02-08 op c->pfd = -1;
795 252908e6 2021-01-24 op
796 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
797 252908e6 2021-01-24 op case FILE_EXISTS:
798 efe7d180 2021-10-02 op c->type = REQUEST_FILE;
799 98ee8406 2021-02-12 op start_reply(c, SUCCESS, mime(c->host, c->iri.path));
800 252908e6 2021-01-24 op break;
801 252908e6 2021-01-24 op
802 252908e6 2021-01-24 op case FILE_DIRECTORY:
803 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
804 252908e6 2021-01-24 op break;
805 252908e6 2021-01-24 op
806 252908e6 2021-01-24 op case FILE_MISSING:
807 252908e6 2021-01-24 op *before_file = '\0';
808 252908e6 2021-01-24 op
809 252908e6 2021-01-24 op if (!vhost_auto_index(c->host, c->iri.path)) {
810 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
811 252908e6 2021-01-24 op break;
812 252908e6 2021-01-24 op }
813 252908e6 2021-01-24 op
814 efe7d180 2021-10-02 op c->type = REQUEST_DIR;
815 252908e6 2021-01-24 op
816 e76f2c74 2021-04-25 op c->dirlen = scandir_fd(dirfd, &c->dir,
817 11c98667 2021-04-25 op root ? select_non_dotdot : select_non_dot,
818 11c98667 2021-04-25 op alphasort);
819 11c98667 2021-04-25 op if (c->dirlen == -1) {
820 11c98667 2021-04-25 op log_err(c, "scandir_fd(%d) (vhost:%s) %s: %s",
821 abc007d2 2021-02-08 op c->pfd, c->host->domain, c->iri.path, strerror(errno));
822 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
823 252908e6 2021-01-24 op return;
824 252908e6 2021-01-24 op }
825 11c98667 2021-04-25 op c->diroff = 0;
826 252908e6 2021-01-24 op c->off = 0;
827 252908e6 2021-01-24 op
828 4842c72d 2021-10-18 op start_reply(c, SUCCESS, "text/gemini");
829 efe7d180 2021-10-02 op evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
830 efe7d180 2021-10-02 op "# Index of %s\n\n", c->iri.path);
831 252908e6 2021-01-24 op return;
832 252908e6 2021-01-24 op
833 252908e6 2021-01-24 op default:
834 252908e6 2021-01-24 op /* unreachable */
835 252908e6 2021-01-24 op abort();
836 252908e6 2021-01-24 op }
837 252908e6 2021-01-24 op
838 252908e6 2021-01-24 op close(dirfd);
839 252908e6 2021-01-24 op }
840 252908e6 2021-01-24 op
841 fe406389 2021-02-02 op static void
842 abc007d2 2021-02-08 op redirect_canonical_dir(struct client *c)
843 252908e6 2021-01-24 op {
844 252908e6 2021-01-24 op size_t len;
845 252908e6 2021-01-24 op
846 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
847 252908e6 2021-01-24 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
848 252908e6 2021-01-24 op len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
849 252908e6 2021-01-24 op
850 0be51733 2021-01-20 op if (len >= sizeof(c->sbuf)) {
851 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
852 0be51733 2021-01-20 op return;
853 0be51733 2021-01-20 op }
854 0be51733 2021-01-20 op
855 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
856 d3a08f4d 2021-01-17 op }
857 5f715ce4 2021-02-02 op
858 fe406389 2021-02-02 op static void
859 efe7d180 2021-10-02 op client_tls_readcb(int fd, short event, void *d)
860 5f715ce4 2021-02-02 op {
861 efe7d180 2021-10-02 op struct bufferevent *bufev = d;
862 efe7d180 2021-10-02 op struct client *client = bufev->cbarg;
863 efe7d180 2021-10-02 op ssize_t ret;
864 efe7d180 2021-10-02 op size_t len;
865 efe7d180 2021-10-02 op int what = EVBUFFER_READ;
866 efe7d180 2021-10-02 op int howmuch = IBUF_READ_SIZE;
867 efe7d180 2021-10-02 op char buf[IBUF_READ_SIZE];
868 d3a08f4d 2021-01-17 op
869 efe7d180 2021-10-02 op if (event == EV_TIMEOUT) {
870 efe7d180 2021-10-02 op what |= EVBUFFER_TIMEOUT;
871 efe7d180 2021-10-02 op goto err;
872 5f715ce4 2021-02-02 op }
873 5f715ce4 2021-02-02 op
874 efe7d180 2021-10-02 op if (bufev->wm_read.high != 0)
875 efe7d180 2021-10-02 op howmuch = MIN(sizeof(buf), bufev->wm_read.high);
876 5f715ce4 2021-02-02 op
877 efe7d180 2021-10-02 op switch (ret = tls_read(client->ctx, buf, howmuch)) {
878 efe7d180 2021-10-02 op case TLS_WANT_POLLIN:
879 efe7d180 2021-10-02 op case TLS_WANT_POLLOUT:
880 efe7d180 2021-10-02 op goto retry;
881 efe7d180 2021-10-02 op case -1:
882 efe7d180 2021-10-02 op what |= EVBUFFER_ERROR;
883 efe7d180 2021-10-02 op goto err;
884 efe7d180 2021-10-02 op }
885 efe7d180 2021-10-02 op len = ret;
886 5f715ce4 2021-02-02 op
887 efe7d180 2021-10-02 op if (len == 0) {
888 efe7d180 2021-10-02 op what |= EVBUFFER_EOF;
889 efe7d180 2021-10-02 op goto err;
890 5f715ce4 2021-02-02 op }
891 5f715ce4 2021-02-02 op
892 efe7d180 2021-10-02 op if (evbuffer_add(bufev->input, buf, len) == -1) {
893 efe7d180 2021-10-02 op what |= EVBUFFER_ERROR;
894 efe7d180 2021-10-02 op goto err;
895 efe7d180 2021-10-02 op }
896 5f715ce4 2021-02-02 op
897 efe7d180 2021-10-02 op event_add(&bufev->ev_read, NULL);
898 efe7d180 2021-10-02 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
899 efe7d180 2021-10-02 op return;
900 efe7d180 2021-10-02 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
901 efe7d180 2021-10-02 op /*
902 efe7d180 2021-10-02 op * here we could implement a read pressure policy.
903 efe7d180 2021-10-02 op */
904 efe7d180 2021-10-02 op }
905 252908e6 2021-01-24 op
906 efe7d180 2021-10-02 op if (bufev->readcb != NULL)
907 efe7d180 2021-10-02 op (*bufev->readcb)(bufev, bufev->cbarg);
908 11c98667 2021-04-25 op
909 efe7d180 2021-10-02 op return;
910 11c98667 2021-04-25 op
911 efe7d180 2021-10-02 op retry:
912 efe7d180 2021-10-02 op event_add(&bufev->ev_read, NULL);
913 efe7d180 2021-10-02 op return;
914 efe7d180 2021-10-02 op
915 efe7d180 2021-10-02 op err:
916 efe7d180 2021-10-02 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
917 252908e6 2021-01-24 op }
918 252908e6 2021-01-24 op
919 fe406389 2021-02-02 op static void
920 efe7d180 2021-10-02 op client_tls_writecb(int fd, short event, void *d)
921 252908e6 2021-01-24 op {
922 efe7d180 2021-10-02 op struct bufferevent *bufev = d;
923 efe7d180 2021-10-02 op struct client *client = bufev->cbarg;
924 efe7d180 2021-10-02 op ssize_t ret;
925 efe7d180 2021-10-02 op size_t len;
926 efe7d180 2021-10-02 op short what = EVBUFFER_WRITE;
927 252908e6 2021-01-24 op
928 efe7d180 2021-10-02 op if (event == EV_TIMEOUT) {
929 efe7d180 2021-10-02 op what |= EVBUFFER_TIMEOUT;
930 efe7d180 2021-10-02 op goto err;
931 efe7d180 2021-10-02 op }
932 252908e6 2021-01-24 op
933 efe7d180 2021-10-02 op if (EVBUFFER_LENGTH(bufev->output) != 0) {
934 efe7d180 2021-10-02 op ret = tls_write(client->ctx,
935 efe7d180 2021-10-02 op EVBUFFER_DATA(bufev->output),
936 efe7d180 2021-10-02 op EVBUFFER_LENGTH(bufev->output));
937 efe7d180 2021-10-02 op switch (ret) {
938 efe7d180 2021-10-02 op case TLS_WANT_POLLIN:
939 efe7d180 2021-10-02 op case TLS_WANT_POLLOUT:
940 efe7d180 2021-10-02 op goto retry;
941 efe7d180 2021-10-02 op case -1:
942 efe7d180 2021-10-02 op what |= EVBUFFER_ERROR;
943 efe7d180 2021-10-02 op goto err;
944 252908e6 2021-01-24 op }
945 efe7d180 2021-10-02 op len = ret;
946 efe7d180 2021-10-02 op evbuffer_drain(bufev->output, len);
947 252908e6 2021-01-24 op }
948 252908e6 2021-01-24 op
949 efe7d180 2021-10-02 op if (EVBUFFER_LENGTH(bufev->output) != 0)
950 efe7d180 2021-10-02 op event_add(&bufev->ev_write, NULL);
951 efe7d180 2021-10-02 op
952 efe7d180 2021-10-02 op if (bufev->writecb != NULL &&
953 efe7d180 2021-10-02 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
954 efe7d180 2021-10-02 op (*bufev->writecb)(bufev, bufev->cbarg);
955 efe7d180 2021-10-02 op return;
956 efe7d180 2021-10-02 op
957 efe7d180 2021-10-02 op retry:
958 efe7d180 2021-10-02 op event_add(&bufev->ev_write, NULL);
959 efe7d180 2021-10-02 op return;
960 efe7d180 2021-10-02 op err:
961 efe7d180 2021-10-02 op log_err(client, "tls error: %s", tls_error(client->ctx));
962 efe7d180 2021-10-02 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
963 252908e6 2021-01-24 op }
964 252908e6 2021-01-24 op
965 fe406389 2021-02-02 op static void
966 efe7d180 2021-10-02 op client_read(struct bufferevent *bev, void *d)
967 3309ef97 2021-01-23 op {
968 efe7d180 2021-10-02 op struct client *c = d;
969 efe7d180 2021-10-02 op struct evbuffer *src = EVBUFFER_INPUT(bev);
970 efe7d180 2021-10-02 op const char *parse_err = "invalid request";
971 efe7d180 2021-10-02 op char decoded[DOMAIN_NAME_LEN];
972 efe7d180 2021-10-02 op size_t len;
973 3309ef97 2021-01-23 op
974 efe7d180 2021-10-02 op bufferevent_disable(bev, EVBUFFER_READ);
975 901905e0 2022-01-05 op
976 901905e0 2022-01-05 op /*
977 901905e0 2022-01-05 op * libevent2 can still somehow call this function, even
978 901905e0 2022-01-05 op * though I never enable EV_READ in the bufferevent. If
979 901905e0 2022-01-05 op * that's the case, bail out.
980 901905e0 2022-01-05 op */
981 901905e0 2022-01-05 op if (c->type != REQUEST_UNDECIDED)
982 901905e0 2022-01-05 op return;
983 abc007d2 2021-02-08 op
984 efe7d180 2021-10-02 op /* max url len + \r\n */
985 efe7d180 2021-10-02 op if (EVBUFFER_LENGTH(src) > 1024 + 2) {
986 efe7d180 2021-10-02 op log_err(c, "too much data received");
987 efe7d180 2021-10-02 op start_reply(c, BAD_REQUEST, "bad request");
988 efe7d180 2021-10-02 op return;
989 efe7d180 2021-10-02 op }
990 3309ef97 2021-01-23 op
991 efe7d180 2021-10-02 op c->req = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
992 efe7d180 2021-10-02 op if (c->req == NULL) {
993 efe7d180 2021-10-02 op /* not enough data yet. */
994 efe7d180 2021-10-02 op bufferevent_enable(bev, EVBUFFER_READ);
995 ea27eaaa 2022-03-27 op return;
996 ea27eaaa 2022-03-27 op }
997 ea27eaaa 2022-03-27 op c->reqlen = strlen(c->req);
998 ea27eaaa 2022-03-27 op if (c->reqlen > 1024+2) {
999 ea27eaaa 2022-03-27 op log_err(c, "URL too long");
1000 ea27eaaa 2022-03-27 op start_reply(c, BAD_REQUEST, "bad request");
1001 35744950 2021-02-01 op return;
1002 3309ef97 2021-01-23 op }
1003 3309ef97 2021-01-23 op
1004 efe7d180 2021-10-02 op if (!parse_iri(c->req, &c->iri, &parse_err) ||
1005 efe7d180 2021-10-02 op !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
1006 efe7d180 2021-10-02 op log_err(c, "IRI parse error: %s", parse_err);
1007 807a80cb 2021-10-06 op start_reply(c, BAD_REQUEST, "bad request");
1008 efe7d180 2021-10-02 op return;
1009 efe7d180 2021-10-02 op }
1010 3309ef97 2021-01-23 op
1011 72b033ef 2021-12-29 op if (apply_reverse_proxy(c))
1012 72b033ef 2021-12-29 op return;
1013 72b033ef 2021-12-29 op
1014 52c92ef6 2021-12-09 op /* ignore the port number */
1015 52c92ef6 2021-12-09 op if (strcmp(c->iri.schema, "gemini") ||
1016 efe7d180 2021-10-02 op strcmp(decoded, c->domain)) {
1017 efe7d180 2021-10-02 op start_reply(c, PROXY_REFUSED, "won't proxy request");
1018 efe7d180 2021-10-02 op return;
1019 efe7d180 2021-10-02 op }
1020 3309ef97 2021-01-23 op
1021 efe7d180 2021-10-02 op if (apply_require_ca(c) ||
1022 efe7d180 2021-10-02 op apply_block_return(c)||
1023 efe7d180 2021-10-02 op apply_fastcgi(c))
1024 35744950 2021-02-01 op return;
1025 efe7d180 2021-10-02 op
1026 efe7d180 2021-10-02 op open_file(c);
1027 3309ef97 2021-01-23 op }
1028 3309ef97 2021-01-23 op
1029 efe7d180 2021-10-02 op void
1030 efe7d180 2021-10-02 op client_write(struct bufferevent *bev, void *d)
1031 d3a08f4d 2021-01-17 op {
1032 efe7d180 2021-10-02 op struct client *c = d;
1033 efe7d180 2021-10-02 op struct evbuffer *out = EVBUFFER_OUTPUT(bev);
1034 f2f8eb35 2022-07-04 op char nam[PATH_MAX];
1035 efe7d180 2021-10-02 op char buf[BUFSIZ];
1036 efe7d180 2021-10-02 op ssize_t r;
1037 d3a08f4d 2021-01-17 op
1038 efe7d180 2021-10-02 op switch (c->type) {
1039 efe7d180 2021-10-02 op case REQUEST_UNDECIDED:
1040 efe7d180 2021-10-02 op /*
1041 efe7d180 2021-10-02 op * Ignore spurious calls when we still don't have idea
1042 efe7d180 2021-10-02 op * what to do with the request.
1043 efe7d180 2021-10-02 op */
1044 efe7d180 2021-10-02 op break;
1045 d3a08f4d 2021-01-17 op
1046 efe7d180 2021-10-02 op case REQUEST_FILE:
1047 efe7d180 2021-10-02 op if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
1048 efe7d180 2021-10-02 op log_warn(c, "read: %s", strerror(errno));
1049 efe7d180 2021-10-02 op client_error(bev, EVBUFFER_ERROR, c);
1050 efe7d180 2021-10-02 op return;
1051 efe7d180 2021-10-02 op } else if (r == 0) {
1052 efe7d180 2021-10-02 op client_close(c);
1053 efe7d180 2021-10-02 op return;
1054 efe7d180 2021-10-02 op } else if (r != sizeof(buf))
1055 efe7d180 2021-10-02 op c->type = REQUEST_DONE;
1056 efe7d180 2021-10-02 op bufferevent_write(bev, buf, r);
1057 efe7d180 2021-10-02 op break;
1058 d3a08f4d 2021-01-17 op
1059 efe7d180 2021-10-02 op case REQUEST_DIR:
1060 efe7d180 2021-10-02 op /* TODO: handle big big directories better */
1061 efe7d180 2021-10-02 op for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
1062 543f4a66 2022-07-04 op const char *sufx = "";
1063 543f4a66 2022-07-04 op
1064 f2f8eb35 2022-07-04 op encode_path(nam, sizeof(nam),
1065 efe7d180 2021-10-02 op c->dir[c->diroff]->d_name);
1066 543f4a66 2022-07-04 op if (c->dir[c->diroff]->d_type == DT_DIR)
1067 543f4a66 2022-07-04 op sufx = "/";
1068 543f4a66 2022-07-04 op evbuffer_add_printf(out, "=> ./%s%s\n", nam, sufx);
1069 efe7d180 2021-10-02 op free(c->dir[c->diroff]);
1070 d3a08f4d 2021-01-17 op }
1071 efe7d180 2021-10-02 op free(c->dir);
1072 efe7d180 2021-10-02 op c->dir = NULL;
1073 27b2fa9a 2021-02-12 op
1074 efe7d180 2021-10-02 op c->type = REQUEST_DONE;
1075 efe7d180 2021-10-02 op
1076 efe7d180 2021-10-02 op event_add(&c->bev->ev_write, NULL);
1077 efe7d180 2021-10-02 op break;
1078 efe7d180 2021-10-02 op
1079 efe7d180 2021-10-02 op case REQUEST_FCGI:
1080 72b033ef 2021-12-29 op case REQUEST_PROXY:
1081 efe7d180 2021-10-02 op /*
1082 d29a2ee2 2022-09-06 op * Here we depend on fastcgi or proxy connection to
1083 d29a2ee2 2022-09-06 op * provide data.
1084 efe7d180 2021-10-02 op */
1085 efe7d180 2021-10-02 op break;
1086 efe7d180 2021-10-02 op
1087 efe7d180 2021-10-02 op case REQUEST_DONE:
1088 efe7d180 2021-10-02 op if (EVBUFFER_LENGTH(out) == 0)
1089 efe7d180 2021-10-02 op client_close(c);
1090 efe7d180 2021-10-02 op break;
1091 d3a08f4d 2021-01-17 op }
1092 efe7d180 2021-10-02 op }
1093 d3a08f4d 2021-01-17 op
1094 efe7d180 2021-10-02 op static void
1095 efe7d180 2021-10-02 op client_error(struct bufferevent *bev, short error, void *d)
1096 efe7d180 2021-10-02 op {
1097 efe7d180 2021-10-02 op struct client *c = d;
1098 efe7d180 2021-10-02 op
1099 efe7d180 2021-10-02 op c->type = REQUEST_DONE;
1100 efe7d180 2021-10-02 op
1101 efe7d180 2021-10-02 op if (error & EVBUFFER_TIMEOUT) {
1102 efe7d180 2021-10-02 op log_warn(c, "timeout reached, "
1103 efe7d180 2021-10-02 op "forcefully closing the connection");
1104 efe7d180 2021-10-02 op if (c->code == 0)
1105 efe7d180 2021-10-02 op start_reply(c, BAD_REQUEST, "timeout");
1106 efe7d180 2021-10-02 op else
1107 efe7d180 2021-10-02 op client_close(c);
1108 efe7d180 2021-10-02 op return;
1109 efe7d180 2021-10-02 op }
1110 efe7d180 2021-10-02 op
1111 efe7d180 2021-10-02 op if (error & EVBUFFER_EOF) {
1112 efe7d180 2021-10-02 op client_close(c);
1113 efe7d180 2021-10-02 op return;
1114 efe7d180 2021-10-02 op }
1115 efe7d180 2021-10-02 op
1116 d98ae929 2022-02-19 op log_err(c, "unknown bufferevent error %x", error);
1117 efe7d180 2021-10-02 op client_close(c);
1118 d3a08f4d 2021-01-17 op }
1119 d3a08f4d 2021-01-17 op
1120 8ad1c570 2021-05-09 op void
1121 efe7d180 2021-10-02 op start_reply(struct client *c, int code, const char *meta)
1122 d3a08f4d 2021-01-17 op {
1123 efe7d180 2021-10-02 op struct evbuffer *evb = EVBUFFER_OUTPUT(c->bev);
1124 efe7d180 2021-10-02 op const char *lang;
1125 efe7d180 2021-10-02 op int r, rr;
1126 efe7d180 2021-10-02 op
1127 efe7d180 2021-10-02 op bufferevent_enable(c->bev, EVBUFFER_WRITE);
1128 efe7d180 2021-10-02 op
1129 efe7d180 2021-10-02 op c->code = code;
1130 efe7d180 2021-10-02 op c->meta = meta;
1131 efe7d180 2021-10-02 op
1132 efe7d180 2021-10-02 op r = evbuffer_add_printf(evb, "%d %s", code, meta);
1133 efe7d180 2021-10-02 op if (r == -1)
1134 efe7d180 2021-10-02 op goto err;
1135 efe7d180 2021-10-02 op
1136 efe7d180 2021-10-02 op /* 2 digit status + space + 1024 max reply */
1137 efe7d180 2021-10-02 op if (r > 1027)
1138 efe7d180 2021-10-02 op goto overflow;
1139 efe7d180 2021-10-02 op
1140 d29a2ee2 2022-09-06 op if (c->type != REQUEST_FCGI &&
1141 72b033ef 2021-12-29 op c->type != REQUEST_PROXY &&
1142 efe7d180 2021-10-02 op !strcmp(meta, "text/gemini") &&
1143 efe7d180 2021-10-02 op (lang = vhost_lang(c->host, c->iri.path)) != NULL) {
1144 4842c72d 2021-10-18 op rr = evbuffer_add_printf(evb, ";lang=%s", lang);
1145 efe7d180 2021-10-02 op if (rr == -1)
1146 efe7d180 2021-10-02 op goto err;
1147 efe7d180 2021-10-02 op if (r + rr > 1027)
1148 efe7d180 2021-10-02 op goto overflow;
1149 efe7d180 2021-10-02 op }
1150 efe7d180 2021-10-02 op
1151 efe7d180 2021-10-02 op bufferevent_write(c->bev, "\r\n", 2);
1152 efe7d180 2021-10-02 op
1153 efe7d180 2021-10-02 op if (!vhost_disable_log(c->host, c->iri.path))
1154 efe7d180 2021-10-02 op log_request(c, EVBUFFER_DATA(evb), EVBUFFER_LENGTH(evb));
1155 efe7d180 2021-10-02 op
1156 d28bd963 2022-01-27 op if (code != 20)
1157 efe7d180 2021-10-02 op c->type = REQUEST_DONE;
1158 efe7d180 2021-10-02 op
1159 efe7d180 2021-10-02 op return;
1160 efe7d180 2021-10-02 op
1161 efe7d180 2021-10-02 op err:
1162 efe7d180 2021-10-02 op log_err(c, "evbuffer_add_printf error: no memory");
1163 efe7d180 2021-10-02 op evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1164 efe7d180 2021-10-02 op client_close(c);
1165 efe7d180 2021-10-02 op return;
1166 efe7d180 2021-10-02 op
1167 efe7d180 2021-10-02 op overflow:
1168 efe7d180 2021-10-02 op log_warn(c, "reply header overflow");
1169 efe7d180 2021-10-02 op evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1170 efe7d180 2021-10-02 op start_reply(c, TEMP_FAILURE, "internal error");
1171 efe7d180 2021-10-02 op }
1172 efe7d180 2021-10-02 op
1173 efe7d180 2021-10-02 op static void
1174 efe7d180 2021-10-02 op client_close_ev(int fd, short event, void *d)
1175 efe7d180 2021-10-02 op {
1176 8ad1c570 2021-05-09 op struct client *c = d;
1177 d3a08f4d 2021-01-17 op
1178 d3a08f4d 2021-01-17 op switch (tls_close(c->ctx)) {
1179 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
1180 efe7d180 2021-10-02 op event_once(c->fd, EV_READ, client_close_ev, c, NULL);
1181 efe7d180 2021-10-02 op break;
1182 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
1183 efe7d180 2021-10-02 op event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
1184 efe7d180 2021-10-02 op break;
1185 d3a08f4d 2021-01-17 op }
1186 d3a08f4d 2021-01-17 op
1187 d3a08f4d 2021-01-17 op connected_clients--;
1188 e4daebe4 2021-10-06 op
1189 e4daebe4 2021-10-06 op free(c->req);
1190 d3a08f4d 2021-01-17 op
1191 d3a08f4d 2021-01-17 op tls_free(c->ctx);
1192 d3a08f4d 2021-01-17 op c->ctx = NULL;
1193 d3a08f4d 2021-01-17 op
1194 efe7d180 2021-10-02 op free(c->header);
1195 efe7d180 2021-10-02 op
1196 abc007d2 2021-02-08 op if (c->pfd != -1)
1197 abc007d2 2021-02-08 op close(c->pfd);
1198 d3a08f4d 2021-01-17 op
1199 252908e6 2021-01-24 op if (c->dir != NULL)
1200 11c98667 2021-04-25 op free(c->dir);
1201 252908e6 2021-01-24 op
1202 abc007d2 2021-02-08 op close(c->fd);
1203 abc007d2 2021-02-08 op c->fd = -1;
1204 72b033ef 2021-12-29 op }
1205 72b033ef 2021-12-29 op
1206 72b033ef 2021-12-29 op static void
1207 72b033ef 2021-12-29 op client_proxy_close(int fd, short event, void *d)
1208 72b033ef 2021-12-29 op {
1209 72b033ef 2021-12-29 op struct tls *ctx = d;
1210 72b033ef 2021-12-29 op
1211 72b033ef 2021-12-29 op if (ctx == NULL) {
1212 72b033ef 2021-12-29 op close(fd);
1213 72b033ef 2021-12-29 op return;
1214 72b033ef 2021-12-29 op }
1215 72b033ef 2021-12-29 op
1216 72b033ef 2021-12-29 op switch (tls_close(ctx)) {
1217 72b033ef 2021-12-29 op case TLS_WANT_POLLIN:
1218 72b033ef 2021-12-29 op event_once(fd, EV_READ, client_proxy_close, d, NULL);
1219 72b033ef 2021-12-29 op break;
1220 72b033ef 2021-12-29 op case TLS_WANT_POLLOUT:
1221 72b033ef 2021-12-29 op event_once(fd, EV_WRITE, client_proxy_close, d, NULL);
1222 72b033ef 2021-12-29 op break;
1223 72b033ef 2021-12-29 op }
1224 72b033ef 2021-12-29 op
1225 72b033ef 2021-12-29 op tls_free(ctx);
1226 72b033ef 2021-12-29 op close(fd);
1227 f890c8c5 2021-01-22 op }
1228 f890c8c5 2021-01-22 op
1229 efe7d180 2021-10-02 op void
1230 efe7d180 2021-10-02 op client_close(struct client *c)
1231 efe7d180 2021-10-02 op {
1232 efe7d180 2021-10-02 op /*
1233 efe7d180 2021-10-02 op * We may end up calling client_close in various situations
1234 efe7d180 2021-10-02 op * and for the most unexpected reasons. Therefore, we need to
1235 b9b77f53 2022-01-27 op * ensure that everything gets properly released once we reach
1236 efe7d180 2021-10-02 op * this point.
1237 efe7d180 2021-10-02 op */
1238 207b3e80 2021-10-07 op
1239 207b3e80 2021-10-07 op SPLAY_REMOVE(client_tree_id, &clients, c);
1240 efe7d180 2021-10-02 op
1241 efe7d180 2021-10-02 op if (c->cgibev != NULL) {
1242 efe7d180 2021-10-02 op bufferevent_disable(c->cgibev, EVBUFFER_READ|EVBUFFER_WRITE);
1243 efe7d180 2021-10-02 op bufferevent_free(c->cgibev);
1244 efe7d180 2021-10-02 op c->cgibev = NULL;
1245 efe7d180 2021-10-02 op close(c->pfd);
1246 efe7d180 2021-10-02 op c->pfd = -1;
1247 efe7d180 2021-10-02 op }
1248 efe7d180 2021-10-02 op
1249 efe7d180 2021-10-02 op bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
1250 efe7d180 2021-10-02 op bufferevent_free(c->bev);
1251 efe7d180 2021-10-02 op c->bev = NULL;
1252 efe7d180 2021-10-02 op
1253 e0f6dc64 2022-01-27 op if (c->proxyevset &&
1254 e0f6dc64 2022-01-27 op event_pending(&c->proxyev, EV_READ|EV_WRITE, NULL)) {
1255 e0f6dc64 2022-01-27 op c->proxyevset = 0;
1256 e0f6dc64 2022-01-27 op event_del(&c->proxyev);
1257 e0f6dc64 2022-01-27 op }
1258 72b033ef 2021-12-29 op
1259 e0f6dc64 2022-01-27 op if (c->pfd != -1 && c->proxyctx != NULL) {
1260 e0f6dc64 2022-01-27 op /* shut down the proxy TLS connection */
1261 e0f6dc64 2022-01-27 op client_proxy_close(c->pfd, 0, c->proxyctx);
1262 e0f6dc64 2022-01-27 op c->pfd = -1;
1263 72b033ef 2021-12-29 op }
1264 e0f6dc64 2022-01-27 op
1265 e0f6dc64 2022-01-27 op if (c->proxybev != NULL)
1266 e0f6dc64 2022-01-27 op bufferevent_free(c->proxybev);
1267 72b033ef 2021-12-29 op
1268 efe7d180 2021-10-02 op client_close_ev(c->fd, 0, c);
1269 efe7d180 2021-10-02 op }
1270 efe7d180 2021-10-02 op
1271 fe406389 2021-02-02 op static void
1272 abc007d2 2021-02-08 op do_accept(int sock, short et, void *d)
1273 d3a08f4d 2021-01-17 op {
1274 abc007d2 2021-02-08 op struct client *c;
1275 d3a08f4d 2021-01-17 op struct sockaddr_storage addr;
1276 abc007d2 2021-02-08 op struct sockaddr *saddr;
1277 d3a08f4d 2021-01-17 op socklen_t len;
1278 207b3e80 2021-10-07 op int fd;
1279 abc007d2 2021-02-08 op
1280 abc007d2 2021-02-08 op saddr = (struct sockaddr*)&addr;
1281 d3a08f4d 2021-01-17 op len = sizeof(addr);
1282 3cb3dd4d 2021-02-12 op if ((fd = accept(sock, saddr, &len)) == -1) {
1283 c62a411f 2021-10-13 op if (errno == EWOULDBLOCK || errno == EAGAIN ||
1284 c62a411f 2021-10-13 op errno == ECONNABORTED)
1285 d3a08f4d 2021-01-17 op return;
1286 d3a08f4d 2021-01-17 op fatal("accept: %s", strerror(errno));
1287 d3a08f4d 2021-01-17 op }
1288 d3a08f4d 2021-01-17 op
1289 3cb3dd4d 2021-02-12 op mark_nonblock(fd);
1290 3cb3dd4d 2021-02-12 op
1291 207b3e80 2021-10-07 op c = xcalloc(1, sizeof(*c));
1292 207b3e80 2021-10-07 op c->id = ++server_client_id;
1293 207b3e80 2021-10-07 op c->fd = fd;
1294 207b3e80 2021-10-07 op c->pfd = -1;
1295 207b3e80 2021-10-07 op c->addr = addr;
1296 d3a08f4d 2021-01-17 op
1297 207b3e80 2021-10-07 op if (tls_accept_socket(ctx, &c->ctx, fd) == -1) {
1298 207b3e80 2021-10-07 op log_warn(c, "failed to accept socket: %s", tls_error(c->ctx));
1299 207b3e80 2021-10-07 op close(c->fd);
1300 207b3e80 2021-10-07 op free(c);
1301 207b3e80 2021-10-07 op return;
1302 d3a08f4d 2021-01-17 op }
1303 d3a08f4d 2021-01-17 op
1304 207b3e80 2021-10-07 op SPLAY_INSERT(client_tree_id, &clients, c);
1305 207b3e80 2021-10-07 op event_once(c->fd, EV_READ|EV_WRITE, handle_handshake, c, NULL);
1306 207b3e80 2021-10-07 op connected_clients++;
1307 d3a08f4d 2021-01-17 op }
1308 d3a08f4d 2021-01-17 op
1309 8ad1c570 2021-05-09 op struct client *
1310 3fdc457c 2022-03-26 op client_by_id(int id)
1311 8ad1c570 2021-05-09 op {
1312 207b3e80 2021-10-07 op struct client find;
1313 207b3e80 2021-10-07 op
1314 207b3e80 2021-10-07 op find.id = id;
1315 207b3e80 2021-10-07 op return SPLAY_FIND(client_tree_id, &clients, &find);
1316 8ad1c570 2021-05-09 op }
1317 8ad1c570 2021-05-09 op
1318 abc007d2 2021-02-08 op static void
1319 d040746a 2022-09-10 op handle_dispatch_imsg(int fd, short ev, void *d)
1320 bc99d868 2021-03-19 op {
1321 d040746a 2022-09-10 op struct imsgbuf *ibuf = d;
1322 d040746a 2022-09-10 op struct imsg imsg;
1323 d040746a 2022-09-10 op ssize_t n;
1324 bc99d868 2021-03-19 op
1325 d040746a 2022-09-10 op if ((n = imsg_read(ibuf)) == -1) {
1326 d040746a 2022-09-10 op if (errno == EAGAIN || errno == EWOULDBLOCK)
1327 d040746a 2022-09-10 op return;
1328 d040746a 2022-09-10 op fatal("imsg_read");
1329 d040746a 2022-09-10 op }
1330 090b8a89 2021-07-06 op
1331 d040746a 2022-09-10 op if (n == 0)
1332 d040746a 2022-09-10 op fatal("connection closed."); /* XXX: fatalx */
1333 d3a08f4d 2021-01-17 op
1334 d040746a 2022-09-10 op for (;;) {
1335 d040746a 2022-09-10 op if ((n = imsg_get(ibuf, &imsg)) == -1)
1336 d040746a 2022-09-10 op fatal("imsg_get");
1337 d040746a 2022-09-10 op if (n == 0)
1338 d040746a 2022-09-10 op return;
1339 d040746a 2022-09-10 op
1340 d040746a 2022-09-10 op switch (imsg.hdr.type) {
1341 d040746a 2022-09-10 op case IMSG_QUIT:
1342 d040746a 2022-09-10 op /*
1343 d040746a 2022-09-10 op * Don't call event_loopbreak since we want to
1344 d040746a 2022-09-10 op * finish handling the ongoing connections.
1345 d040746a 2022-09-10 op */
1346 d040746a 2022-09-10 op shutting_down = 1;
1347 d040746a 2022-09-10 op
1348 d040746a 2022-09-10 op event_del(&e4);
1349 d040746a 2022-09-10 op if (has_ipv6)
1350 d040746a 2022-09-10 op event_del(&e6);
1351 d040746a 2022-09-10 op if (has_siginfo)
1352 d040746a 2022-09-10 op signal_del(&siginfo);
1353 d040746a 2022-09-10 op event_del(&imsgev);
1354 d040746a 2022-09-10 op signal_del(&sigusr2);
1355 d040746a 2022-09-10 op break;
1356 d040746a 2022-09-10 op default:
1357 d040746a 2022-09-10 op /* XXX: fatalx */
1358 d040746a 2022-09-10 op fatal("Unknown message %d", imsg.hdr.type);
1359 d040746a 2022-09-10 op }
1360 d040746a 2022-09-10 op imsg_free(&imsg);
1361 d040746a 2022-09-10 op }
1362 bc99d868 2021-03-19 op }
1363 bc99d868 2021-03-19 op
1364 bc99d868 2021-03-19 op static void
1365 abc007d2 2021-02-08 op handle_siginfo(int fd, short ev, void *d)
1366 abc007d2 2021-02-08 op {
1367 abc007d2 2021-02-08 op log_info(NULL, "%d connected clients", connected_clients);
1368 abc007d2 2021-02-08 op }
1369 d3a08f4d 2021-01-17 op
1370 abc007d2 2021-02-08 op void
1371 bc99d868 2021-03-19 op loop(struct tls *ctx_, int sock4, int sock6, struct imsgbuf *ibuf)
1372 abc007d2 2021-02-08 op {
1373 bc99d868 2021-03-19 op ctx = ctx_;
1374 bc99d868 2021-03-19 op
1375 207b3e80 2021-10-07 op SPLAY_INIT(&clients);
1376 207b3e80 2021-10-07 op
1377 abc007d2 2021-02-08 op event_init();
1378 1e3ef7ab 2021-02-03 op
1379 bc99d868 2021-03-19 op event_set(&e4, sock4, EV_READ | EV_PERSIST, &do_accept, NULL);
1380 a6e689d7 2021-02-12 op event_add(&e4, NULL);
1381 ca21e100 2021-02-04 op
1382 abc007d2 2021-02-08 op if (sock6 != -1) {
1383 a6e689d7 2021-02-12 op has_ipv6 = 1;
1384 bc99d868 2021-03-19 op event_set(&e6, sock6, EV_READ | EV_PERSIST, &do_accept, NULL);
1385 a6e689d7 2021-02-12 op event_add(&e6, NULL);
1386 d3a08f4d 2021-01-17 op }
1387 abc007d2 2021-02-08 op
1388 0126d91d 2022-09-07 op if (ibuf) {
1389 0126d91d 2022-09-07 op event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST,
1390 0126d91d 2022-09-07 op handle_dispatch_imsg, ibuf);
1391 0126d91d 2022-09-07 op event_add(&imsgev, NULL);
1392 0126d91d 2022-09-07 op }
1393 abc007d2 2021-02-08 op
1394 abc007d2 2021-02-08 op #ifdef SIGINFO
1395 a6e689d7 2021-02-12 op has_siginfo = 1;
1396 a6e689d7 2021-02-12 op signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
1397 a6e689d7 2021-02-12 op signal_add(&siginfo, NULL);
1398 abc007d2 2021-02-08 op #endif
1399 5e3285d5 2021-02-12 op signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
1400 a6e689d7 2021-02-12 op signal_add(&sigusr2, NULL);
1401 abc007d2 2021-02-08 op
1402 76000995 2022-09-06 op sandbox_server_process(conf.can_open_sockets);
1403 abc007d2 2021-02-08 op event_dispatch();
1404 df58efff 2021-02-08 op _exit(0);
1405 d3a08f4d 2021-01-17 op }
1406 207b3e80 2021-10-07 op
1407 207b3e80 2021-10-07 op int
1408 207b3e80 2021-10-07 op client_tree_cmp(struct client *a, struct client *b)
1409 207b3e80 2021-10-07 op {
1410 207b3e80 2021-10-07 op if (a->id == b->id)
1411 207b3e80 2021-10-07 op return 0;
1412 207b3e80 2021-10-07 op else if (a->id < b->id)
1413 207b3e80 2021-10-07 op return -1;
1414 207b3e80 2021-10-07 op else
1415 207b3e80 2021-10-07 op return +1;
1416 207b3e80 2021-10-07 op }
1417 207b3e80 2021-10-07 op
1418 207b3e80 2021-10-07 op SPLAY_GENERATE(client_tree_id, client, entry, client_tree_cmp)