2 d3a08f4d 2021-01-17 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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.
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.
17 d3a08f4d 2021-01-17 op #include <sys/mman.h>
18 d3a08f4d 2021-01-17 op #include <sys/stat.h>
20 d3a08f4d 2021-01-17 op #include <netdb.h>
22 d3a08f4d 2021-01-17 op #include <assert.h>
23 d3a08f4d 2021-01-17 op #include <errno.h>
24 abc007d2 2021-02-08 op #include <event.h>
25 d3a08f4d 2021-01-17 op #include <fcntl.h>
26 b4d409cf 2021-01-21 op #include <fnmatch.h>
27 2fafa2d2 2021-02-01 op #include <limits.h>
28 d3a08f4d 2021-01-17 op #include <string.h>
30 d3a08f4d 2021-01-17 op #include "gmid.h"
32 abc007d2 2021-02-08 op struct server {
33 abc007d2 2021-02-08 op struct client clients[MAX_USERS];
34 abc007d2 2021-02-08 op struct tls *ctx;
37 abc007d2 2021-02-08 op struct server_events {
38 abc007d2 2021-02-08 op struct event e4;
40 abc007d2 2021-02-08 op struct event e6;
41 abc007d2 2021-02-08 op struct event sighup;
44 d3a08f4d 2021-01-17 op int connected_clients;
46 49b73ba1 2021-02-10 op static inline int matches(const char*, const char*);
48 abc007d2 2021-02-08 op static inline void reschedule_read(int, struct client*, statefn);
49 abc007d2 2021-02-08 op static inline void reschedule_write(int, struct client*, statefn);
51 fe406389 2021-02-02 op static int check_path(struct client*, const char*, int*);
52 abc007d2 2021-02-08 op static void open_file(struct client*);
53 abc007d2 2021-02-08 op static void load_file(struct client*);
54 abc007d2 2021-02-08 op static void check_for_cgi(struct client*);
55 abc007d2 2021-02-08 op static void handle_handshake(int, short, void*);
56 57ec3e77 2021-02-08 op static char *strip_path(char*, int);
57 57ec3e77 2021-02-08 op static void fmt_sbuf(const char*, struct client*, const char*);
58 abc007d2 2021-02-08 op static int apply_block_return(struct client*);
59 02be96c6 2021-02-09 op static int apply_require_ca(struct client*);
60 abc007d2 2021-02-08 op static void handle_open_conn(int, short, void*);
61 abc007d2 2021-02-08 op static void start_reply(struct client*, int, const char*);
62 abc007d2 2021-02-08 op static void handle_start_reply(int, short, void*);
63 abc007d2 2021-02-08 op static void start_cgi(const char*, const char*, struct client*);
64 abc007d2 2021-02-08 op static void send_file(int, short, void*);
65 abc007d2 2021-02-08 op static void open_dir(struct client*);
66 abc007d2 2021-02-08 op static void redirect_canonical_dir(struct client*);
67 abc007d2 2021-02-08 op static void enter_handle_dirlist(int, short, void*);
68 abc007d2 2021-02-08 op static void handle_dirlist(int, short, void*);
69 fe406389 2021-02-02 op static int read_next_dir_entry(struct client*);
70 abc007d2 2021-02-08 op static void send_directory_listing(int, short, void*);
71 abc007d2 2021-02-08 op static void handle_cgi_reply(int, short, void*);
72 abc007d2 2021-02-08 op static void handle_cgi(int, short, void*);
73 abc007d2 2021-02-08 op static void close_conn(int, short, void*);
74 abc007d2 2021-02-08 op static void do_accept(int, short, void*);
75 abc007d2 2021-02-08 op static void handle_sighup(int, short, void*);
77 49b73ba1 2021-02-10 op static inline int
78 49b73ba1 2021-02-10 op matches(const char *pattern, const char *path)
80 49b73ba1 2021-02-10 op if (*path == '/')
82 49b73ba1 2021-02-10 op return !fnmatch(pattern, path, 0);
85 abc007d2 2021-02-08 op static inline void
86 abc007d2 2021-02-08 op reschedule_read(int fd, struct client *c, statefn fn)
88 abc007d2 2021-02-08 op event_once(fd, EV_READ, fn, c, NULL);
92 abc007d2 2021-02-08 op reschedule_write(int fd, struct client *c, statefn fn)
94 abc007d2 2021-02-08 op event_once(fd, EV_WRITE, fn, c, NULL);
98 c8b74339 2021-01-24 op vhost_lang(struct vhost *v, const char *path)
100 c8b74339 2021-01-24 op struct location *loc;
102 caad0308 2021-01-27 op if (v == NULL || path == NULL)
105 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
106 cd761624 2021-02-06 op if (loc->lang != NULL) {
107 49b73ba1 2021-02-10 op if (matches(loc->match, path))
108 6016a593 2021-01-30 op return loc->lang;
112 6016a593 2021-01-30 op return v->locations[0].lang;
116 c8b74339 2021-01-24 op vhost_default_mime(struct vhost *v, const char *path)
118 c8b74339 2021-01-24 op struct location *loc;
119 c8b74339 2021-01-24 op const char *default_mime = "application/octet-stream";
121 caad0308 2021-01-27 op if (v == NULL || path == NULL)
122 caad0308 2021-01-27 op return default_mime;
124 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
125 cd761624 2021-02-06 op if (loc->default_mime != NULL) {
126 49b73ba1 2021-02-10 op if (matches(loc->match, path))
127 6016a593 2021-01-30 op return loc->default_mime;
131 6016a593 2021-01-30 op if (v->locations[0].default_mime != NULL)
132 6016a593 2021-01-30 op return v->locations[0].default_mime;
133 c8b74339 2021-01-24 op return default_mime;
137 c8b74339 2021-01-24 op vhost_index(struct vhost *v, const char *path)
139 c8b74339 2021-01-24 op struct location *loc;
140 c8b74339 2021-01-24 op const char *index = "index.gmi";
142 caad0308 2021-01-27 op if (v == NULL || path == NULL)
143 caad0308 2021-01-27 op return index;
145 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
146 cd761624 2021-02-06 op if (loc->index != NULL) {
147 49b73ba1 2021-02-10 op if (matches(loc->match, path))
148 6016a593 2021-01-30 op return loc->index;
152 b59f3cdd 2021-01-30 op if (v->locations[0].index != NULL)
153 b59f3cdd 2021-01-30 op return v->locations[0].index;
154 c8b74339 2021-01-24 op return index;
158 252908e6 2021-01-24 op vhost_auto_index(struct vhost *v, const char *path)
160 252908e6 2021-01-24 op struct location *loc;
162 6016a593 2021-01-30 op if (v == NULL || path == NULL)
165 daac4a94 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
166 cd761624 2021-02-06 op if (loc->auto_index != 0) {
167 49b73ba1 2021-02-10 op if (matches(loc->match, path))
168 6016a593 2021-01-30 op return loc->auto_index == 1;
172 6016a593 2021-01-30 op return v->locations[0].auto_index == 1;
176 6abda252 2021-02-06 op vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
178 6abda252 2021-02-06 op struct location *loc;
180 6abda252 2021-02-06 op if (v == NULL || path == NULL)
183 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
184 cd761624 2021-02-06 op if (loc->block_code != 0) {
185 49b73ba1 2021-02-10 op if (matches(loc->match, path)) {
186 6abda252 2021-02-06 op *code = loc->block_code;
187 6abda252 2021-02-06 op *fmt = loc->block_fmt;
193 6abda252 2021-02-06 op *code = v->locations[0].block_code;
194 6abda252 2021-02-06 op *fmt = v->locations[0].block_fmt;
195 6abda252 2021-02-06 op return v->locations[0].block_code != 0;
199 6abda252 2021-02-06 op vhost_strip(struct vhost *v, const char *path)
201 6abda252 2021-02-06 op struct location *loc;
203 6abda252 2021-02-06 op if (v == NULL || path == NULL)
206 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
207 cd761624 2021-02-06 op if (loc->strip != 0) {
208 49b73ba1 2021-02-10 op if (matches(loc->match, path))
209 6abda252 2021-02-06 op return loc->strip;
213 6abda252 2021-02-06 op return v->locations[0].strip;
217 02be96c6 2021-02-09 op vhost_require_ca(struct vhost *v, const char *path)
219 02be96c6 2021-02-09 op struct location *loc;
221 02be96c6 2021-02-09 op if (v == NULL || path == NULL)
224 02be96c6 2021-02-09 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
225 02be96c6 2021-02-09 op if (loc->reqca != NULL) {
226 49b73ba1 2021-02-10 op if (matches(loc->match, path))
227 02be96c6 2021-02-09 op return loc->reqca;
231 02be96c6 2021-02-09 op return v->locations[0].reqca;
235 d3a08f4d 2021-01-17 op check_path(struct client *c, const char *path, int *fd)
237 d3a08f4d 2021-01-17 op struct stat sb;
238 d1ca3911 2021-01-21 op const char *p;
241 d3a08f4d 2021-01-17 op assert(path != NULL);
243 d1ca3911 2021-01-21 op if (*path == '\0')
245 d1ca3911 2021-01-21 op else if (*path == '/')
246 d1ca3911 2021-01-21 op /* in send_dir we add an initial / (to be
247 d1ca3911 2021-01-21 op * redirect-friendly), but here we want to skip it */
252 252908e6 2021-01-24 op flags = O_RDONLY | O_NOFOLLOW;
254 252908e6 2021-01-24 op if (*fd == -1 && (*fd = openat(c->host->dirfd, p, flags)) == -1)
255 d3a08f4d 2021-01-17 op return FILE_MISSING;
257 d3a08f4d 2021-01-17 op if (fstat(*fd, &sb) == -1) {
258 3abf91b0 2021-02-07 op log_notice(c, "failed stat for %s: %s", path, strerror(errno));
259 d3a08f4d 2021-01-17 op return FILE_MISSING;
262 d3a08f4d 2021-01-17 op if (S_ISDIR(sb.st_mode))
263 d3a08f4d 2021-01-17 op return FILE_DIRECTORY;
265 d3a08f4d 2021-01-17 op if (sb.st_mode & S_IXUSR)
266 d3a08f4d 2021-01-17 op return FILE_EXECUTABLE;
268 d3a08f4d 2021-01-17 op return FILE_EXISTS;
272 abc007d2 2021-02-08 op open_file(struct client *c)
274 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
275 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
276 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
277 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
281 d3a08f4d 2021-01-17 op /* fallthrough */
283 d3a08f4d 2021-01-17 op case FILE_EXISTS:
284 abc007d2 2021-02-08 op load_file(c);
287 d3a08f4d 2021-01-17 op case FILE_DIRECTORY:
291 d3a08f4d 2021-01-17 op case FILE_MISSING:
292 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
293 abc007d2 2021-02-08 op check_for_cgi(c);
296 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
300 d3a08f4d 2021-01-17 op /* unreachable */
306 abc007d2 2021-02-08 op load_file(struct client *c)
308 abc007d2 2021-02-08 op if ((c->len = filesize(c->pfd)) == -1) {
309 3abf91b0 2021-02-07 op log_err(c, "failed to get file size for %s: %s",
310 87f2b68b 2021-02-02 op c->iri.path, strerror(errno));
311 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
315 252908e6 2021-01-24 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
316 abc007d2 2021-02-08 op c->pfd, 0)) == MAP_FAILED) {
317 3abf91b0 2021-02-07 op log_err(c, "mmap: %s: %s", c->iri.path, strerror(errno));
318 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
321 252908e6 2021-01-24 op c->i = c->buf;
322 112802ea 2021-02-01 op c->next = send_file;
323 abc007d2 2021-02-08 op start_reply(c, SUCCESS, mime(c->host, c->iri.path));
327 d3a08f4d 2021-01-17 op * the inverse of this algorithm, i.e. starting from the start of the
328 d3a08f4d 2021-01-17 op * path + strlen(cgi), and checking if each component, should be
329 d3a08f4d 2021-01-17 op * faster. But it's tedious to write. This does the opposite: starts
330 d3a08f4d 2021-01-17 op * from the end and strip one component at a time, until either an
331 d3a08f4d 2021-01-17 op * executable is found or we emptied the path.
334 abc007d2 2021-02-08 op check_for_cgi(struct client *c)
336 2fafa2d2 2021-02-01 op char path[PATH_MAX];
339 2fafa2d2 2021-02-01 op strlcpy(path, c->iri.path, sizeof(path));
340 d3a08f4d 2021-01-17 op end = strchr(path, '\0');
342 d3a08f4d 2021-01-17 op while (end > path) {
343 d3a08f4d 2021-01-17 op /* go up one level. UNIX paths are simple and POSIX
344 d3a08f4d 2021-01-17 op * dirname, with its ambiguities on if the given path
345 d3a08f4d 2021-01-17 op * is changed or not, gives me headaches. */
346 d3a08f4d 2021-01-17 op while (*end != '/')
350 abc007d2 2021-02-08 op switch (check_path(c, path, &c->pfd)) {
351 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
352 abc007d2 2021-02-08 op start_cgi(path, end+1, c);
354 d3a08f4d 2021-01-17 op case FILE_MISSING:
365 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
370 9b8f5ed2 2021-02-03 op mark_nonblock(int fd)
374 9b8f5ed2 2021-02-03 op if ((flags = fcntl(fd, F_GETFL)) == -1)
375 9b8f5ed2 2021-02-03 op fatal("fcntl(F_GETFL): %s", strerror(errno));
376 9b8f5ed2 2021-02-03 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
377 9b8f5ed2 2021-02-03 op fatal("fcntl(F_SETFL): %s", strerror(errno));
381 abc007d2 2021-02-08 op handle_handshake(int fd, short ev, void *d)
383 abc007d2 2021-02-08 op struct client *c = d;
384 d3a08f4d 2021-01-17 op struct vhost *h;
385 d3a08f4d 2021-01-17 op const char *servname;
386 a8d4a897 2021-01-29 op const char *parse_err = "unknown error";
388 d3a08f4d 2021-01-17 op switch (tls_handshake(c->ctx)) {
389 d3a08f4d 2021-01-17 op case 0: /* success */
390 d3a08f4d 2021-01-17 op case -1: /* already handshaked */
392 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
393 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
395 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
396 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_handshake);
399 d3a08f4d 2021-01-17 op /* unreachable */
403 d3a08f4d 2021-01-17 op servname = tls_conn_servername(c->ctx);
404 a8d4a897 2021-01-29 op if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
405 3abf91b0 2021-02-07 op log_info(c, "puny_decode: %s", parse_err);
409 d3a08f4d 2021-01-17 op for (h = hosts; h->domain != NULL; ++h) {
410 3300cbe0 2021-01-27 op if (!fnmatch(h->domain, c->domain, 0))
414 3abf91b0 2021-02-07 op log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
415 3abf91b0 2021-02-07 op servname != NULL ? servname : "(null)",
417 3abf91b0 2021-02-07 op h->domain != NULL ? h->domain : "(null)");
419 d3a08f4d 2021-01-17 op if (h->domain != NULL) {
421 abc007d2 2021-02-08 op handle_open_conn(fd, ev, c);
426 0ab65593 2021-01-21 op if (servname != NULL)
427 0ab65593 2021-01-21 op strncpy(c->req, servname, sizeof(c->req));
429 0ab65593 2021-01-21 op strncpy(c->req, "null", sizeof(c->req));
431 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
434 57ec3e77 2021-02-08 op static char *
435 57ec3e77 2021-02-08 op strip_path(char *path, int strip)
439 6abda252 2021-02-06 op while (strip > 0) {
440 6abda252 2021-02-06 op if ((t = strchr(path, '/')) == NULL) {
441 6abda252 2021-02-06 op path = strchr(path, '\0');
452 57ec3e77 2021-02-08 op fmt_sbuf(const char *fmt, struct client *c, const char *path)
455 57ec3e77 2021-02-08 op char buf[32];
457 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
458 6abda252 2021-02-06 op for (i = 0; *fmt; ++fmt) {
459 6abda252 2021-02-06 op if (i == sizeof(buf)-1 || *fmt == '%') {
460 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
461 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
465 6abda252 2021-02-06 op if (*fmt != '%') {
466 6abda252 2021-02-06 op buf[i++] = *fmt;
470 6abda252 2021-02-06 op switch (*++fmt) {
472 6abda252 2021-02-06 op strlcat(c->sbuf, "%", sizeof(c->sbuf));
475 6abda252 2021-02-06 op strlcat(c->sbuf, path, sizeof(c->sbuf));
478 6abda252 2021-02-06 op strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
481 6abda252 2021-02-06 op snprintf(buf, sizeof(buf), "%d", conf.port);
482 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
483 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
486 6abda252 2021-02-06 op strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
489 6abda252 2021-02-06 op fatal("%s: unknown fmt specifier %c",
490 6abda252 2021-02-06 op __func__, *fmt);
495 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
498 57ec3e77 2021-02-08 op /* 1 if a matching `block return' (and apply it), 0 otherwise */
500 57ec3e77 2021-02-08 op apply_block_return(struct client *c)
502 57ec3e77 2021-02-08 op const char *fmt, *path;
505 57ec3e77 2021-02-08 op if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
508 57ec3e77 2021-02-08 op path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
509 57ec3e77 2021-02-08 op fmt_sbuf(fmt, c, path);
511 abc007d2 2021-02-08 op start_reply(c, code, c->sbuf);
515 02be96c6 2021-02-09 op /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
517 02be96c6 2021-02-09 op apply_require_ca(struct client *c)
519 02be96c6 2021-02-09 op X509_STORE *store;
520 02be96c6 2021-02-09 op const uint8_t *cert;
523 02be96c6 2021-02-09 op if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
526 02be96c6 2021-02-09 op if (!tls_peer_cert_provided(c->ctx)) {
527 02be96c6 2021-02-09 op start_reply(c, CLIENT_CERT_REQ, "client certificate required");
531 02be96c6 2021-02-09 op cert = tls_peer_cert_chain_pem(c->ctx, &len);
532 02be96c6 2021-02-09 op if (!validate_against_ca(store, cert, len)) {
533 02be96c6 2021-02-09 op start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
541 abc007d2 2021-02-08 op handle_open_conn(int fd, short ev, void *d)
543 abc007d2 2021-02-08 op struct client *c = d;
544 d3a08f4d 2021-01-17 op const char *parse_err = "invalid request";
545 3300cbe0 2021-01-27 op char decoded[DOMAIN_NAME_LEN];
547 0be51733 2021-01-20 op bzero(c->req, sizeof(c->req));
548 0be51733 2021-01-20 op bzero(&c->iri, sizeof(c->iri));
550 0be51733 2021-01-20 op switch (tls_read(c->ctx, c->req, sizeof(c->req)-1)) {
552 3abf91b0 2021-02-07 op log_err(c, "tls_read: %s", tls_error(c->ctx));
553 abc007d2 2021-02-08 op close_conn(fd, ev, c);
556 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
557 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_open_conn);
560 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
561 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_open_conn);
565 c4f682f8 2021-01-27 op if (!trim_req_iri(c->req, &parse_err)
566 a2fd8013 2021-01-29 op || !parse_iri(c->req, &c->iri, &parse_err)
567 a2fd8013 2021-01-29 op || !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
568 3abf91b0 2021-02-07 op log_info(c, "iri parse error: %s", parse_err);
569 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "invalid request");
573 3300cbe0 2021-01-27 op if (c->iri.port_no != conf.port
574 3300cbe0 2021-01-27 op || strcmp(c->iri.schema, "gemini")
575 3300cbe0 2021-01-27 op || strcmp(decoded, c->domain)) {
576 abc007d2 2021-02-08 op start_reply(c, PROXY_REFUSED, "won't proxy request");
580 02be96c6 2021-02-09 op if (apply_require_ca(c))
583 abc007d2 2021-02-08 op if (apply_block_return(c))
586 e3ddf390 2021-02-06 op if (c->host->entrypoint != NULL) {
587 abc007d2 2021-02-08 op start_cgi(c->host->entrypoint, c->iri.path, c);
591 abc007d2 2021-02-08 op open_file(c);
595 abc007d2 2021-02-08 op start_reply(struct client *c, int code, const char *meta)
597 112802ea 2021-02-01 op c->code = code;
598 112802ea 2021-02-01 op c->meta = meta;
599 abc007d2 2021-02-08 op handle_start_reply(c->fd, 0, c);
603 abc007d2 2021-02-08 op handle_start_reply(int fd, short ev, void *d)
605 abc007d2 2021-02-08 op struct client *c = d;
606 05c23a54 2021-01-19 op char buf[1030]; /* status + ' ' + max reply len + \r\n\0 */
607 c8b74339 2021-01-24 op const char *lang;
610 c8b74339 2021-01-24 op lang = vhost_lang(c->host, c->iri.path);
612 112802ea 2021-02-01 op snprintf(buf, sizeof(buf), "%d ", c->code);
613 112802ea 2021-02-01 op strlcat(buf, c->meta, sizeof(buf));
614 112802ea 2021-02-01 op if (!strcmp(c->meta, "text/gemini") && lang != NULL) {
615 05c23a54 2021-01-19 op strlcat(buf, "; lang=", sizeof(buf));
616 c8b74339 2021-01-24 op strlcat(buf, lang, sizeof(buf));
619 05c23a54 2021-01-19 op len = strlcat(buf, "\r\n", sizeof(buf));
620 0be51733 2021-01-20 op assert(len < sizeof(buf));
622 df79b4c1 2021-01-19 op switch (tls_write(c->ctx, buf, len)) {
624 abc007d2 2021-02-08 op close_conn(fd, ev, c);
626 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
627 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_start_reply);
629 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
630 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_start_reply);
634 a87f6625 2021-01-24 op log_request(c, buf, sizeof(buf));
636 abc007d2 2021-02-08 op if (c->code != SUCCESS)
637 abc007d2 2021-02-08 op close_conn(fd, ev, c);
639 abc007d2 2021-02-08 op c->next(fd, ev, c);
643 abc007d2 2021-02-08 op start_cgi(const char *spath, const char *relpath, struct client *c)
645 d3a08f4d 2021-01-17 op char addr[NI_MAXHOST];
648 d3a08f4d 2021-01-17 op e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
649 d3a08f4d 2021-01-17 op addr, sizeof(addr),
651 d3a08f4d 2021-01-17 op NI_NUMERICHOST);
655 2fafa2d2 2021-02-01 op if (!send_iri(exfd, &c->iri)
656 2fafa2d2 2021-02-01 op || !send_string(exfd, spath)
657 d3a08f4d 2021-01-17 op || !send_string(exfd, relpath)
658 d3a08f4d 2021-01-17 op || !send_string(exfd, addr)
659 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_subject(c->ctx))
660 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_issuer(c->ctx))
661 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_hash(c->ctx))
662 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notbefore(c->ctx))
663 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notafter(c->ctx))
664 d3a08f4d 2021-01-17 op || !send_vhost(exfd, c->host))
667 abc007d2 2021-02-08 op close(c->pfd);
668 abc007d2 2021-02-08 op if ((c->pfd = recv_fd(exfd)) == -1) {
669 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
673 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi_reply);
677 d3a08f4d 2021-01-17 op /* fatal("cannot talk to the executor process: %s", strerror(errno)); */
678 132cae8c 2021-01-18 op fatal("cannot talk to the executor process");
682 abc007d2 2021-02-08 op send_file(int fd, short ev, void *d)
684 abc007d2 2021-02-08 op struct client *c = d;
685 d3a08f4d 2021-01-17 op ssize_t ret, len;
687 d3a08f4d 2021-01-17 op len = (c->buf + c->len) - c->i;
689 d3a08f4d 2021-01-17 op while (len > 0) {
690 d3a08f4d 2021-01-17 op switch (ret = tls_write(c->ctx, c->i, len)) {
692 3abf91b0 2021-02-07 op log_err(c, "tls_write: %s", tls_error(c->ctx));
693 abc007d2 2021-02-08 op close_conn(fd, ev, c);
696 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
697 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_file);
700 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
701 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_file);
711 abc007d2 2021-02-08 op close_conn(fd, ev, c);
715 abc007d2 2021-02-08 op open_dir(struct client *c)
719 252908e6 2021-01-24 op char *before_file;
721 0be51733 2021-01-20 op len = strlen(c->iri.path);
722 252908e6 2021-01-24 op if (len > 0 && !ends_with(c->iri.path, "/")) {
723 abc007d2 2021-02-08 op redirect_canonical_dir(c);
727 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
728 d1ca3911 2021-01-21 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
729 d1ca3911 2021-01-21 op if (!ends_with(c->sbuf, "/"))
730 0be51733 2021-01-20 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
731 252908e6 2021-01-24 op before_file = strchr(c->sbuf, '\0');
732 c8b74339 2021-01-24 op len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
733 c8b74339 2021-01-24 op sizeof(c->sbuf));
734 252908e6 2021-01-24 op if (len >= sizeof(c->sbuf)) {
735 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
739 252908e6 2021-01-24 op c->iri.path = c->sbuf;
741 252908e6 2021-01-24 op /* close later unless we have to generate the dir listing */
742 abc007d2 2021-02-08 op dirfd = c->pfd;
745 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
746 252908e6 2021-01-24 op case FILE_EXECUTABLE:
747 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
748 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
752 252908e6 2021-01-24 op /* fallthrough */
754 252908e6 2021-01-24 op case FILE_EXISTS:
755 abc007d2 2021-02-08 op load_file(c);
758 252908e6 2021-01-24 op case FILE_DIRECTORY:
759 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
762 252908e6 2021-01-24 op case FILE_MISSING:
763 252908e6 2021-01-24 op *before_file = '\0';
765 252908e6 2021-01-24 op if (!vhost_auto_index(c->host, c->iri.path)) {
766 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
770 abc007d2 2021-02-08 op c->pfd = dirfd;
771 5f715ce4 2021-02-02 op c->next = enter_handle_dirlist;
773 abc007d2 2021-02-08 op if ((c->dir = fdopendir(c->pfd)) == NULL) {
774 3abf91b0 2021-02-07 op log_err(c, "fdopendir(%d) (vhost:%s) %s: %s",
775 abc007d2 2021-02-08 op c->pfd, c->host->domain, c->iri.path, strerror(errno));
776 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
781 abc007d2 2021-02-08 op start_reply(c, SUCCESS, "text/gemini");
785 252908e6 2021-01-24 op /* unreachable */
789 252908e6 2021-01-24 op close(dirfd);
793 abc007d2 2021-02-08 op redirect_canonical_dir(struct client *c)
797 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
798 252908e6 2021-01-24 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
799 252908e6 2021-01-24 op len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
801 0be51733 2021-01-20 op if (len >= sizeof(c->sbuf)) {
802 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
806 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
810 abc007d2 2021-02-08 op enter_handle_dirlist(int fd, short ev, void *d)
812 abc007d2 2021-02-08 op struct client *c = d;
813 5f715ce4 2021-02-02 op char b[PATH_MAX];
816 5f715ce4 2021-02-02 op strlcpy(b, c->iri.path, sizeof(b));
817 5f715ce4 2021-02-02 op l = snprintf(c->sbuf, sizeof(c->sbuf),
818 5f715ce4 2021-02-02 op "# Index of %s\n\n", b);
819 5f715ce4 2021-02-02 op if (l >= sizeof(c->sbuf)) {
820 5f715ce4 2021-02-02 op /* this is impossible, given that we have enough space
821 5f715ce4 2021-02-02 op * in c->sbuf to hold the ancilliary string plus the
822 5f715ce4 2021-02-02 op * full path; but it wouldn't read nice without some
823 5f715ce4 2021-02-02 op * error checking, and I'd like to avoid a strlen. */
824 abc007d2 2021-02-08 op close_conn(fd, ev, c);
829 abc007d2 2021-02-08 op handle_dirlist(fd, ev, c);
833 abc007d2 2021-02-08 op handle_dirlist(int fd, short ev, void *d)
835 abc007d2 2021-02-08 op struct client *c = d;
838 5f715ce4 2021-02-02 op while (c->len > 0) {
839 5f715ce4 2021-02-02 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
841 abc007d2 2021-02-08 op close_conn(fd, ev, c);
843 5f715ce4 2021-02-02 op case TLS_WANT_POLLOUT:
844 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_dirlist);
846 5f715ce4 2021-02-02 op case TLS_WANT_POLLIN:
847 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_dirlist);
855 abc007d2 2021-02-08 op send_directory_listing(fd, ev, c);
859 252908e6 2021-01-24 op read_next_dir_entry(struct client *c)
861 252908e6 2021-01-24 op struct dirent *d;
865 252908e6 2021-01-24 op if ((d = readdir(c->dir)) == NULL) {
866 252908e6 2021-01-24 op if (errno != 0)
867 3abf91b0 2021-02-07 op log_err(c, "readdir: %s", strerror(errno));
870 252908e6 2021-01-24 op } while (!strcmp(d->d_name, "."));
872 252908e6 2021-01-24 op /* XXX: url escape */
873 252908e6 2021-01-24 op snprintf(c->sbuf, sizeof(c->sbuf), "=> %s %s\n",
874 252908e6 2021-01-24 op d->d_name, d->d_name);
875 252908e6 2021-01-24 op c->len = strlen(c->sbuf);
882 abc007d2 2021-02-08 op send_directory_listing(int fd, short ev, void *d)
884 abc007d2 2021-02-08 op struct client *c = d;
888 252908e6 2021-01-24 op if (c->len == 0) {
889 252908e6 2021-01-24 op if (!read_next_dir_entry(c))
893 252908e6 2021-01-24 op while (c->len > 0) {
894 252908e6 2021-01-24 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
898 252908e6 2021-01-24 op case TLS_WANT_POLLOUT:
899 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_directory_listing);
902 252908e6 2021-01-24 op case TLS_WANT_POLLIN:
903 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_directory_listing);
915 abc007d2 2021-02-08 op close_conn(fd, ev, d);
918 35744950 2021-02-01 op /* accumulate the meta line from the cgi script. */
920 abc007d2 2021-02-08 op handle_cgi_reply(int fd, short ev, void *d)
922 abc007d2 2021-02-08 op struct client *c = d;
923 35744950 2021-02-01 op void *buf, *e;
928 35744950 2021-02-01 op buf = c->sbuf + c->len;
929 35744950 2021-02-01 op len = sizeof(c->sbuf) - c->len;
931 abc007d2 2021-02-08 op r = read(c->pfd, buf, len);
932 35744950 2021-02-01 op if (r == 0 || r == -1) {
933 abc007d2 2021-02-08 op start_reply(c, CGI_ERROR, "CGI error");
939 35744950 2021-02-01 op /* TODO: error if the CGI script don't reply correctly */
940 35744950 2021-02-01 op e = strchr(c->sbuf, '\n');
941 35744950 2021-02-01 op if (e != NULL || c->len == sizeof(c->sbuf)) {
942 3309ef97 2021-01-23 op log_request(c, c->sbuf, c->len);
945 abc007d2 2021-02-08 op handle_cgi(fd, ev, c);
949 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_cgi_reply);
953 abc007d2 2021-02-08 op handle_cgi(int fd, short ev, void *d)
955 abc007d2 2021-02-08 op struct client *c = d;
959 35744950 2021-02-01 op if (c->len == 0) {
960 abc007d2 2021-02-08 op switch (r = read(c->pfd, c->sbuf, sizeof(c->sbuf))) {
964 d3a08f4d 2021-01-17 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
965 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi);
975 d3a08f4d 2021-01-17 op while (c->len > 0) {
976 d3a08f4d 2021-01-17 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
980 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
981 abc007d2 2021-02-08 op reschedule_read(c->fd, c, &handle_cgi);
984 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
985 abc007d2 2021-02-08 op reschedule_write(c->fd, c, &handle_cgi);
997 abc007d2 2021-02-08 op close_conn(c->fd, ev, d);
1001 abc007d2 2021-02-08 op close_conn(int fd, short ev, void *d)
1003 abc007d2 2021-02-08 op struct client *c = d;
1005 d3a08f4d 2021-01-17 op switch (tls_close(c->ctx)) {
1006 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
1007 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
1009 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
1010 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
1014 d3a08f4d 2021-01-17 op connected_clients--;
1016 d3a08f4d 2021-01-17 op tls_free(c->ctx);
1017 d3a08f4d 2021-01-17 op c->ctx = NULL;
1019 d3a08f4d 2021-01-17 op if (c->buf != MAP_FAILED)
1020 d3a08f4d 2021-01-17 op munmap(c->buf, c->len);
1022 abc007d2 2021-02-08 op if (c->pfd != -1)
1023 abc007d2 2021-02-08 op close(c->pfd);
1025 252908e6 2021-01-24 op if (c->dir != NULL)
1026 252908e6 2021-01-24 op closedir(c->dir);
1028 abc007d2 2021-02-08 op close(c->fd);
1033 abc007d2 2021-02-08 op do_accept(int sock, short et, void *d)
1035 abc007d2 2021-02-08 op struct client *c;
1036 abc007d2 2021-02-08 op struct server *s = d;
1037 d3a08f4d 2021-01-17 op struct sockaddr_storage addr;
1038 abc007d2 2021-02-08 op struct sockaddr *saddr;
1039 d3a08f4d 2021-01-17 op socklen_t len;
1045 abc007d2 2021-02-08 op saddr = (struct sockaddr*)&addr;
1046 d3a08f4d 2021-01-17 op len = sizeof(addr);
1047 abc007d2 2021-02-08 op if ((fd = accept4(sock, saddr, &len, SOCK_NONBLOCK)) == -1) {
1048 cfb8a77f 2021-02-07 op if (errno == EWOULDBLOCK || errno == EAGAIN)
1050 d3a08f4d 2021-01-17 op fatal("accept: %s", strerror(errno));
1053 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; ++i) {
1054 abc007d2 2021-02-08 op c = &s->clients[i];
1055 abc007d2 2021-02-08 op if (c->fd == -1) {
1056 abc007d2 2021-02-08 op memset(c, 0, sizeof(*c));
1057 abc007d2 2021-02-08 op if (tls_accept_socket(s->ctx, &c->ctx, fd) == -1)
1058 d3a08f4d 2021-01-17 op break; /* goodbye fd! */
1061 abc007d2 2021-02-08 op c->pfd = -1;
1062 abc007d2 2021-02-08 op c->buf = MAP_FAILED;
1063 abc007d2 2021-02-08 op c->dir = NULL;
1064 abc007d2 2021-02-08 op c->addr = addr;
1066 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
1067 d3a08f4d 2021-01-17 op connected_clients++;
1076 abc007d2 2021-02-08 op handle_sighup(int fd, short ev, void *d)
1078 abc007d2 2021-02-08 op struct server_events *events = d;
1083 abc007d2 2021-02-08 op event_del(&events->e4);
1084 abc007d2 2021-02-08 op if (events->has_ipv6)
1085 abc007d2 2021-02-08 op event_del(&events->e6);
1086 abc007d2 2021-02-08 op signal_del(&events->sighup);
1090 abc007d2 2021-02-08 op handle_siginfo(int fd, short ev, void *d)
1096 abc007d2 2021-02-08 op log_info(NULL, "%d connected clients", connected_clients);
1100 abc007d2 2021-02-08 op loop(struct tls *ctx, int sock4, int sock6)
1102 abc007d2 2021-02-08 op struct server_events events;
1103 abc007d2 2021-02-08 op struct server server;
1104 abc007d2 2021-02-08 op struct event info;
1107 abc007d2 2021-02-08 op event_init();
1109 abc007d2 2021-02-08 op memset(&events, 0, sizeof(events));
1110 abc007d2 2021-02-08 op memset(&server, 0, sizeof(server));
1111 abc007d2 2021-02-08 op for (i = 0; i < MAX_USERS; ++i)
1112 abc007d2 2021-02-08 op server.clients[i].fd = -1;
1114 abc007d2 2021-02-08 op event_set(&events.e4, sock4, EV_READ | EV_PERSIST, &do_accept, &server);
1115 abc007d2 2021-02-08 op event_add(&events.e4, NULL);
1117 abc007d2 2021-02-08 op if (sock6 != -1) {
1118 abc007d2 2021-02-08 op events.has_ipv6 = 1;
1119 abc007d2 2021-02-08 op event_set(&events.e6, sock6, EV_READ | EV_PERSIST, &do_accept, &server);
1120 abc007d2 2021-02-08 op event_add(&events.e6, NULL);
1123 abc007d2 2021-02-08 op signal_set(&events.sighup, SIGHUP, &handle_sighup, &events);
1124 abc007d2 2021-02-08 op signal_add(&events.sighup, NULL);
1126 abc007d2 2021-02-08 op #ifdef SIGINFO
1127 abc007d2 2021-02-08 op signal_set(&info, SIGINFO, &handle_siginfo, NULL);
1128 abc007d2 2021-02-08 op signal_add(&info, NULL);
1130 abc007d2 2021-02-08 op signal_set(&info, SIGUSR2, &handle_siginfo, NULL);
1131 abc007d2 2021-02-08 op signal_add(&info, NULL);
1133 abc007d2 2021-02-08 op server.ctx = ctx;
1136 abc007d2 2021-02-08 op event_dispatch();
