2 3e4749f7 2020-10-02 op * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
4 3e4749f7 2020-10-02 op * Permission to use, copy, modify, and distribute this software for any
5 3e4749f7 2020-10-02 op * purpose with or without fee is hereby granted, provided that the above
6 3e4749f7 2020-10-02 op * copyright notice and this permission notice appear in all copies.
8 3e4749f7 2020-10-02 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 3e4749f7 2020-10-02 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 3e4749f7 2020-10-02 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 3e4749f7 2020-10-02 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 3e4749f7 2020-10-02 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 3e4749f7 2020-10-02 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 3e4749f7 2020-10-02 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 f28f9311 2020-10-14 op #include <sys/mman.h>
18 3e4749f7 2020-10-02 op #include <sys/stat.h>
20 3e4749f7 2020-10-02 op #include <assert.h>
21 3e4749f7 2020-10-02 op #include <err.h>
22 592fd624 2020-10-07 op #include <errno.h>
23 3e4749f7 2020-10-02 op #include <fcntl.h>
24 231bfcdc 2020-12-21 op #include <limits.h>
25 709d6e5e 2021-01-10 op #include <netdb.h>
26 0cf902af 2020-11-03 op #include <signal.h>
27 80bbcad5 2021-01-10 op #include <stdarg.h>
28 3e4749f7 2020-10-02 op #include <string.h>
30 488f059a 2020-12-24 op #include "gmid.h"
32 15902770 2021-01-15 op struct vhost hosts[HOSTSLEN];
34 120381c9 2020-11-06 op int connected_clients;
37 15902770 2021-01-15 op struct conf conf;
39 33d32d1f 2020-12-25 op struct etm { /* file extension to mime */
40 33d32d1f 2020-12-25 op const char *mime;
41 33d32d1f 2020-12-25 op const char *ext;
42 33d32d1f 2020-12-25 op } filetypes[] = {
43 33d32d1f 2020-12-25 op {"application/pdf", "pdf"},
45 33d32d1f 2020-12-25 op {"image/gif", "gif"},
46 33d32d1f 2020-12-25 op {"image/jpeg", "jpg"},
47 33d32d1f 2020-12-25 op {"image/jpeg", "jpeg"},
48 33d32d1f 2020-12-25 op {"image/png", "png"},
49 33d32d1f 2020-12-25 op {"image/svg+xml", "svg"},
51 33d32d1f 2020-12-25 op {"text/gemini", "gemini"},
52 33d32d1f 2020-12-25 op {"text/gemini", "gmi"},
53 33d32d1f 2020-12-25 op {"text/markdown", "markdown"},
54 33d32d1f 2020-12-25 op {"text/markdown", "md"},
55 33d32d1f 2020-12-25 op {"text/plain", "txt"},
56 33d32d1f 2020-12-25 op {"text/xml", "xml"},
61 9b374f41 2021-01-10 op static inline void
62 9b374f41 2021-01-10 op safe_setenv(const char *name, const char *val)
64 9b374f41 2021-01-10 op if (val == NULL)
66 9b374f41 2021-01-10 op setenv(name, val, 1);
69 80bbcad5 2021-01-10 op __attribute__ ((format (printf, 1, 2)))
70 0d7a38c4 2021-01-11 op __attribute__ ((__noreturn__))
71 0d7a38c4 2021-01-11 op static inline void
72 80bbcad5 2021-01-10 op fatal(const char *fmt, ...)
76 80bbcad5 2021-01-10 op va_start(ap, fmt);
78 15902770 2021-01-15 op if (conf.foreground) {
79 80bbcad5 2021-01-10 op vfprintf(stderr, fmt, ap);
80 80bbcad5 2021-01-10 op fprintf(stderr, "\n");
82 80bbcad5 2021-01-10 op vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
89 709d6e5e 2021-01-10 op logs(int priority, struct client *c,
90 709d6e5e 2021-01-10 op const char *fmt, ...)
92 709d6e5e 2021-01-10 op char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
93 709d6e5e 2021-01-10 op char *fmted, *s;
98 80bbcad5 2021-01-10 op va_start(ap, fmt);
100 dafb57b8 2021-01-15 op if (c == NULL) {
101 dafb57b8 2021-01-15 op strncpy(hbuf, "<internal>", sizeof(hbuf));
102 dafb57b8 2021-01-15 op sbuf[0] = '\0';
104 dafb57b8 2021-01-15 op len = sizeof(c->addr);
105 dafb57b8 2021-01-15 op ec = getnameinfo((struct sockaddr*)&c->addr, len,
106 f7b816dc 2021-01-15 op hbuf, sizeof(hbuf),
107 f7b816dc 2021-01-15 op sbuf, sizeof(sbuf),
108 f7b816dc 2021-01-15 op NI_NUMERICHOST | NI_NUMERICSERV);
110 dafb57b8 2021-01-15 op fatal("getnameinfo: %s", gai_strerror(ec));
113 709d6e5e 2021-01-10 op if (vasprintf(&fmted, fmt, ap) == -1)
114 709d6e5e 2021-01-10 op fatal("vasprintf: %s", strerror(errno));
116 15902770 2021-01-15 op if (conf.foreground)
117 709d6e5e 2021-01-10 op fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
119 709d6e5e 2021-01-10 op if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
120 709d6e5e 2021-01-10 op fatal("asprintf: %s", strerror(errno));
121 709d6e5e 2021-01-10 op syslog(priority | LOG_DAEMON, "%s", s);
131 4a28dd01 2020-12-28 op sig_handler(int sig)
137 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
141 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
142 72f653b6 2020-11-06 op if (str[i] != prefix[i])
148 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
150 f7b816dc 2021-01-15 op char buf[1030]; /* status + ' ' + max reply len + \r\n\0 */
153 592fd624 2020-10-07 op client->code = code;
154 592fd624 2020-10-07 op client->meta = reason;
155 592fd624 2020-10-07 op client->state = S_INITIALIZING;
157 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
158 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
160 f7b816dc 2021-01-15 op switch (tls_write(client->ctx, buf, len)) {
161 f7b816dc 2021-01-15 op case TLS_WANT_POLLIN:
162 592fd624 2020-10-07 op pfd->events = POLLIN;
164 f7b816dc 2021-01-15 op case TLS_WANT_POLLOUT:
165 592fd624 2020-10-07 op pfd->events = POLLOUT;
173 f28f9311 2020-10-14 op filesize(int fd)
177 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
179 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
185 cc68fe70 2020-10-07 op path_ext(const char *path)
187 cc68fe70 2020-10-07 op const char *end;
189 f7b816dc 2021-01-15 op end = path + strlen(path)-1;
190 cc68fe70 2020-10-07 op for (; end != path; --end) {
191 cc68fe70 2020-10-07 op if (*end == '.')
192 cc68fe70 2020-10-07 op return end+1;
193 cc68fe70 2020-10-07 op if (*end == '/')
201 cc68fe70 2020-10-07 op mime(const char *path)
203 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
204 cc68fe70 2020-10-07 op struct etm *t;
206 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
209 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
210 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
211 cc68fe70 2020-10-07 op return t->mime;
217 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
219 72342dc9 2020-11-06 op struct stat sb;
221 f28f9311 2020-10-14 op assert(path != NULL);
222 15902770 2021-01-15 op if ((*fd = openat(c->host->dirfd, *path ? path : ".",
223 f7b816dc 2021-01-15 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
224 a5d310bc 2020-11-10 op return FILE_MISSING;
227 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
228 d7802bb4 2020-12-02 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
229 a5d310bc 2020-11-10 op return FILE_MISSING;
232 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
233 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
235 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
236 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
238 a5d310bc 2020-11-10 op return FILE_EXISTS;
242 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
243 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
244 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
245 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
246 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
249 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
252 a5d310bc 2020-11-10 op end = strchr(path, '\0');
254 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
256 a5d310bc 2020-11-10 op while (end > path) {
257 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
258 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
259 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
260 a5d310bc 2020-11-10 op while (*end != '/')
264 d7802bb4 2020-12-02 op switch (check_path(c, path, &c->fd)) {
265 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
266 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
267 a5d310bc 2020-11-10 op case FILE_MISSING:
278 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
280 a5d310bc 2020-11-10 op goodbye(fds, c);
285 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
287 d7802bb4 2020-12-02 op switch (check_path(c, fpath, &c->fd)) {
288 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
289 15902770 2021-01-15 op if (c->host->cgi != NULL && starts_with(fpath, c->host->cgi))
290 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
292 a5d310bc 2020-11-10 op /* fallthrough */
294 a5d310bc 2020-11-10 op case FILE_EXISTS:
295 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
296 d7802bb4 2020-12-02 op LOGE(c, "failed to get file size for %s", fpath);
297 a5d310bc 2020-11-10 op goodbye(fds, c);
301 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
302 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
303 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
304 a5d310bc 2020-11-10 op goodbye(fds, c);
307 a5d310bc 2020-11-10 op c->i = c->buf;
308 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
310 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
311 d7802bb4 2020-12-02 op LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
312 f28f9311 2020-10-14 op close(c->fd);
314 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
317 a5d310bc 2020-11-10 op case FILE_MISSING:
318 15902770 2021-01-15 op if (c->host->cgi != NULL && starts_with(fpath, c->host->cgi))
319 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
321 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
323 f28f9311 2020-10-14 op goodbye(fds, c);
327 a5d310bc 2020-11-10 op /* unreachable */
333 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
334 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
337 f7b816dc 2021-01-15 op int p[2]; /* read end, write end */
339 72342dc9 2020-11-06 op if (pipe(p) == -1)
342 72342dc9 2020-11-06 op switch (pid = fork()) {
346 f7b816dc 2021-01-15 op case 0: { /* child */
347 721e2325 2020-11-18 op char *ex, *requri, *portno;
348 85dff1f9 2021-01-11 op char addr[NI_MAXHOST];
349 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
353 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
354 72342dc9 2020-11-06 op goto childerr;
356 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
357 a5d310bc 2020-11-10 op goto childerr;
359 85dff1f9 2021-01-11 op ec = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
360 85dff1f9 2021-01-11 op addr, sizeof(addr),
362 85dff1f9 2021-01-11 op NI_NUMERICHOST | NI_NUMERICSERV);
364 85dff1f9 2021-01-11 op goto childerr;
366 15902770 2021-01-15 op if (asprintf(&portno, "%d", conf.port) == -1)
367 721e2325 2020-11-18 op goto childerr;
369 15902770 2021-01-15 op if (asprintf(&ex, "%s/%s", c->host->dir, spath) == -1)
370 72342dc9 2020-11-06 op goto childerr;
372 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
373 f7b816dc 2021-01-15 op *relpath == '\0' ? "" : "/", relpath) == -1)
374 a5d310bc 2020-11-10 op goto childerr;
376 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
378 60ba426e 2020-11-06 op /* fix the env */
379 9b374f41 2021-01-10 op safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
380 9b374f41 2021-01-10 op safe_setenv("SERVER_SOFTWARE", "gmid");
381 9b374f41 2021-01-10 op safe_setenv("SERVER_PORT", portno);
382 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
383 9b374f41 2021-01-10 op safe_setenv("SCRIPT_NAME", spath);
384 9b374f41 2021-01-10 op safe_setenv("SCRIPT_EXECUTABLE", ex);
385 9b374f41 2021-01-10 op safe_setenv("REQUEST_URI", requri);
386 9b374f41 2021-01-10 op safe_setenv("REQUEST_RELATIVE", relpath);
387 9b374f41 2021-01-10 op safe_setenv("QUERY_STRING", query);
388 9b374f41 2021-01-10 op safe_setenv("REMOTE_HOST", addr);
389 9b374f41 2021-01-10 op safe_setenv("REMOTE_ADDR", addr);
390 15902770 2021-01-15 op safe_setenv("DOCUMENT_ROOT", c->host->dir);
392 677afbd3 2020-12-02 op if (tls_peer_cert_provided(c->ctx)) {
393 9b374f41 2021-01-10 op safe_setenv("AUTH_TYPE", "Certificate");
394 9b374f41 2021-01-10 op safe_setenv("REMOTE_USER", tls_peer_cert_subject(c->ctx));
395 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
396 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
399 a5d310bc 2020-11-10 op execvp(ex, argv);
400 72342dc9 2020-11-06 op goto childerr;
403 72342dc9 2020-11-06 op default: /* parent */
405 72342dc9 2020-11-06 op close(c->fd);
406 72342dc9 2020-11-06 op c->fd = p[0];
407 72342dc9 2020-11-06 op c->child = pid;
408 aff8d190 2020-11-06 op mark_nonblock(c->fd);
409 aff8d190 2020-11-06 op c->state = S_SENDING;
410 72342dc9 2020-11-06 op handle_cgi(fds, c);
415 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
417 72342dc9 2020-11-06 op goodbye(fds, c);
421 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
427 6c6c7a0e 2020-12-28 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
431 aff8d190 2020-11-06 op if (c->waiting_on_child)
433 aff8d190 2020-11-06 op c->waiting_on_child = 1;
435 aff8d190 2020-11-06 op fds->events = POLLIN;
437 aff8d190 2020-11-06 op fd = fds->fd;
438 aff8d190 2020-11-06 op fds->fd = c->fd;
443 6c6c7a0e 2020-12-28 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
447 aff8d190 2020-11-06 op if (!c->waiting_on_child)
449 aff8d190 2020-11-06 op c->waiting_on_child = 0;
451 aff8d190 2020-11-06 op fd = fds->fd;
452 aff8d190 2020-11-06 op fds->fd = c->fd;
457 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
461 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
462 6c6c7a0e 2020-12-28 op cgi_poll_on_client(fds, c);
465 aff8d190 2020-11-06 op if (c->len == 0) {
466 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
468 aff8d190 2020-11-06 op if (r == -1) {
469 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
470 6c6c7a0e 2020-12-28 op cgi_poll_on_child(fds, c);
479 aff8d190 2020-11-06 op while (c->len > 0) {
480 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
484 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
485 aff8d190 2020-11-06 op fds->events = POLLOUT;
488 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
489 aff8d190 2020-11-06 op fds->events = POLLIN;
501 72342dc9 2020-11-06 op goodbye(fds, c);
505 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
507 f28f9311 2020-10-14 op ssize_t ret, len;
509 f28f9311 2020-10-14 op if (c->fd == -1) {
510 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
512 f28f9311 2020-10-14 op c->state = S_SENDING;
515 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
517 f28f9311 2020-10-14 op while (len > 0) {
518 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
520 d7802bb4 2020-12-02 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
521 f28f9311 2020-10-14 op goodbye(fds, c);
524 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
525 f28f9311 2020-10-14 op fds->events = POLLIN;
528 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
529 f28f9311 2020-10-14 op fds->events = POLLOUT;
539 f28f9311 2020-10-14 op goodbye(fds, c);
543 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
545 3e4749f7 2020-10-02 op char fpath[PATHBUF];
548 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
550 9c56b0a7 2020-10-14 op if (path[0] != '.')
551 3e4749f7 2020-10-02 op fpath[0] = '.';
553 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
554 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
555 3e4749f7 2020-10-02 op len = strlen(fpath);
557 3e4749f7 2020-10-02 op /* add a trailing / in case. */
558 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
559 3e4749f7 2020-10-02 op fpath[len] = '/';
562 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
564 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
568 9862b637 2021-01-13 op handle_handshake(struct pollfd *fds, struct client *c)
570 15902770 2021-01-15 op struct vhost *h;
571 15902770 2021-01-15 op const char *servname;
573 9862b637 2021-01-13 op switch (tls_handshake(c->ctx)) {
574 9862b637 2021-01-13 op case 0: /* success */
575 9862b637 2021-01-13 op case -1: /* already handshaked */
577 9862b637 2021-01-13 op case TLS_WANT_POLLIN:
578 9862b637 2021-01-13 op fds->events = POLLIN;
580 9862b637 2021-01-13 op case TLS_WANT_POLLOUT:
581 9862b637 2021-01-13 op fds->events = POLLOUT;
584 9862b637 2021-01-13 op /* unreachable */
588 15902770 2021-01-15 op servname = tls_conn_servername(c->ctx);
589 15902770 2021-01-15 op if (servname == NULL)
590 f7b816dc 2021-01-15 op goto hostnotfound;
592 15902770 2021-01-15 op for (h = hosts; h->domain != NULL; ++h) {
593 15902770 2021-01-15 op if (!strcmp(h->domain, servname) || !strcmp(h->domain, "*"))
597 15902770 2021-01-15 op if (h->domain != NULL) {
598 15902770 2021-01-15 op c->state = S_OPEN;
600 15902770 2021-01-15 op handle_open_conn(fds, c);
604 f7b816dc 2021-01-15 op hostnotfound:
605 15902770 2021-01-15 op /* XXX: check the correct response */
606 15902770 2021-01-15 op if (!start_reply(fds, c, BAD_REQUEST, "Wrong host or missing SNI"))
608 15902770 2021-01-15 op goodbye(fds, c);
612 9862b637 2021-01-13 op handle_open_conn(struct pollfd *fds, struct client *c)
614 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
615 9862b637 2021-01-13 op const char *parse_err = "invalid request";
616 3c1cf9d0 2021-01-11 op struct iri iri;
618 9862b637 2021-01-13 op bzero(buf, sizeof(buf));
620 9862b637 2021-01-13 op switch (tls_read(c->ctx, buf, sizeof(buf)-1)) {
622 9862b637 2021-01-13 op LOGE(c, "tls_read: %s", tls_error(c->ctx));
623 9862b637 2021-01-13 op goodbye(fds, c);
626 9862b637 2021-01-13 op case TLS_WANT_POLLIN:
627 9862b637 2021-01-13 op fds->events = POLLIN;
630 9862b637 2021-01-13 op case TLS_WANT_POLLOUT:
631 9862b637 2021-01-13 op fds->events = POLLOUT;
635 9862b637 2021-01-13 op if (!trim_req_iri(buf) || !parse_iri(buf, &iri, &parse_err)) {
636 9862b637 2021-01-13 op if (!start_reply(fds, c, BAD_REQUEST, parse_err))
638 9862b637 2021-01-13 op goodbye(fds, c);
642 b777bf4b 2021-01-15 op if (strcmp(iri.schema, "gemini") || iri.port_no != conf.port) {
643 9862b637 2021-01-13 op if (!start_reply(fds, c, PROXY_REFUSED, "won't proxy request"))
645 9862b637 2021-01-13 op goodbye(fds, c);
649 9862b637 2021-01-13 op LOGI(c, "GET %s%s%s",
650 f7b816dc 2021-01-15 op *iri.path ? iri.path : "/",
651 f7b816dc 2021-01-15 op *iri.query ? "?" : "",
652 f7b816dc 2021-01-15 op *iri.query ? iri.query : "");
654 9862b637 2021-01-13 op send_file(iri.path, iri.query, fds, c);
658 9862b637 2021-01-13 op handle(struct pollfd *fds, struct client *client)
660 9862b637 2021-01-13 op switch (client->state) {
661 9862b637 2021-01-13 op case S_HANDSHAKE:
662 9862b637 2021-01-13 op handle_handshake(fds, client);
666 9862b637 2021-01-13 op handle_open_conn(fds, client);
669 592fd624 2020-10-07 op case S_INITIALIZING:
670 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
673 592fd624 2020-10-07 op if (client->code != SUCCESS) {
674 592fd624 2020-10-07 op /* we don't need a body */
675 592fd624 2020-10-07 op goodbye(fds, client);
679 592fd624 2020-10-07 op client->state = S_SENDING;
681 592fd624 2020-10-07 op /* fallthrough */
683 592fd624 2020-10-07 op case S_SENDING:
684 aff8d190 2020-11-06 op if (client->child != -1)
685 aff8d190 2020-11-06 op handle_cgi(fds, client);
687 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
690 592fd624 2020-10-07 op case S_CLOSING:
691 592fd624 2020-10-07 op goodbye(fds, client);
695 592fd624 2020-10-07 op /* unreachable */
701 592fd624 2020-10-07 op mark_nonblock(int fd)
705 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
706 80bbcad5 2021-01-10 op fatal("fcntl(F_GETFL): %s", strerror(errno));
707 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
708 80bbcad5 2021-01-10 op fatal("fcntl(F_SETFL): %s", strerror(errno));
712 9468027b 2020-10-15 op make_socket(int port, int family)
715 9468027b 2020-10-15 op struct sockaddr_in addr4;
716 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
717 9468027b 2020-10-15 op struct sockaddr *addr;
718 9468027b 2020-10-15 op socklen_t len;
720 9468027b 2020-10-15 op switch (family) {
721 9468027b 2020-10-15 op case AF_INET:
722 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
723 9468027b 2020-10-15 op addr4.sin_family = family;
724 9468027b 2020-10-15 op addr4.sin_port = htons(port);
725 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
726 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
727 9468027b 2020-10-15 op len = sizeof(addr4);
730 9468027b 2020-10-15 op case AF_INET6:
731 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
732 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
733 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
734 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
735 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
736 9468027b 2020-10-15 op len = sizeof(addr6);
740 9468027b 2020-10-15 op /* unreachable */
744 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
745 80bbcad5 2021-01-10 op fatal("socket: %s", strerror(errno));
748 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
749 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
752 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
753 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
755 592fd624 2020-10-07 op mark_nonblock(sock);
757 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
758 80bbcad5 2021-01-10 op fatal("bind: %s", strerror(errno));
760 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
761 80bbcad5 2021-01-10 op fatal("listen: %s", strerror(errno));
767 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
770 709d6e5e 2021-01-10 op struct sockaddr_storage addr;
771 3e4749f7 2020-10-02 op socklen_t len;
773 592fd624 2020-10-07 op len = sizeof(addr);
774 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
775 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
777 80bbcad5 2021-01-10 op fatal("accept: %s", strerror(errno));
780 592fd624 2020-10-07 op mark_nonblock(fd);
782 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
783 592fd624 2020-10-07 op if (fds[i].fd == -1) {
784 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
785 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
786 592fd624 2020-10-07 op break; /* goodbye fd! */
788 592fd624 2020-10-07 op fds[i].fd = fd;
789 592fd624 2020-10-07 op fds[i].events = POLLIN;
791 9862b637 2021-01-13 op clients[i].state = S_HANDSHAKE;
792 592fd624 2020-10-07 op clients[i].fd = -1;
793 72342dc9 2020-11-06 op clients[i].child = -1;
794 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
795 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
796 709d6e5e 2021-01-10 op clients[i].addr = addr;
798 120381c9 2020-11-06 op connected_clients++;
807 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
809 592fd624 2020-10-07 op c->state = S_CLOSING;
811 f7b816dc 2021-01-15 op switch (tls_close(c->ctx)) {
812 f7b816dc 2021-01-15 op case TLS_WANT_POLLIN:
813 592fd624 2020-10-07 op pfd->events = POLLIN;
815 f7b816dc 2021-01-15 op case TLS_WANT_POLLOUT:
816 592fd624 2020-10-07 op pfd->events = POLLOUT;
820 120381c9 2020-11-06 op connected_clients--;
822 592fd624 2020-10-07 op tls_free(c->ctx);
823 592fd624 2020-10-07 op c->ctx = NULL;
825 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
826 f28f9311 2020-10-14 op munmap(c->buf, c->len);
828 592fd624 2020-10-07 op if (c->fd != -1)
829 592fd624 2020-10-07 op close(c->fd);
831 592fd624 2020-10-07 op close(pfd->fd);
832 592fd624 2020-10-07 op pfd->fd = -1;
836 33756bd2 2021-01-10 op loop(struct tls *ctx, int sock4, int sock6)
839 592fd624 2020-10-07 op struct client clients[MAX_USERS];
840 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
842 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
843 592fd624 2020-10-07 op fds[i].fd = -1;
844 592fd624 2020-10-07 op fds[i].events = POLLIN;
845 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
848 33756bd2 2021-01-10 op fds[0].fd = sock4;
849 33756bd2 2021-01-10 op fds[1].fd = sock6;
852 16ace04d 2021-01-08 op if (poll(fds, MAX_USERS, INFTIM) == -1) {
853 120381c9 2020-11-06 op if (errno == EINTR) {
854 d7802bb4 2020-12-02 op warnx("connected clients: %d",
855 d7802bb4 2020-12-02 op connected_clients);
858 80bbcad5 2021-01-10 op fatal("poll: %s", strerror(errno));
861 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
862 592fd624 2020-10-07 op if (fds[i].revents == 0)
865 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
866 80bbcad5 2021-01-10 op fatal("bad fd %d: %s", fds[i].fd,
867 d7802bb4 2020-12-02 op strerror(errno));
869 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
870 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
871 aff8d190 2020-11-06 op * of a cgi script that has exited. */
872 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
873 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
878 33756bd2 2021-01-10 op if (fds[i].fd == sock4)
879 33756bd2 2021-01-10 op do_accept(sock4, ctx, fds, clients);
880 33756bd2 2021-01-10 op else if (fds[i].fd == sock6)
881 33756bd2 2021-01-10 op do_accept(sock6, ctx, fds, clients);
883 33756bd2 2021-01-10 op handle(&fds[i], &clients[i]);
889 231bfcdc 2020-12-21 op absolutify_path(const char *path)
891 231bfcdc 2020-12-21 op char *wd, *r;
893 231bfcdc 2020-12-21 op if (*path == '/')
894 231bfcdc 2020-12-21 op return strdup(path);
896 231bfcdc 2020-12-21 op wd = getwd(NULL);
897 231bfcdc 2020-12-21 op if (asprintf(&r, "%s/%s", wd, path) == -1)
898 231bfcdc 2020-12-21 op err(1, "asprintf");
904 15902770 2021-01-15 op yyerror(const char *msg)
906 15902770 2021-01-15 op goterror = 1;
907 15902770 2021-01-15 op fprintf(stderr, "%d: %s\n", yylineno, msg);
911 15902770 2021-01-15 op parse_portno(const char *p)
917 15902770 2021-01-15 op lval = strtol(p, &ep, 10);
918 15902770 2021-01-15 op if (p[0] == '\0' || *ep != '\0')
919 15902770 2021-01-15 op errx(1, "not a number: %s", p);
920 15902770 2021-01-15 op if (lval < 0 || lval > UINT16_MAX)
921 15902770 2021-01-15 op errx(1, "port number out of range for domain %s: %ld", p, lval);
926 15902770 2021-01-15 op parse_conf(const char *path)
928 15902770 2021-01-15 op if ((yyin = fopen(path, "r")) == NULL)
929 15902770 2021-01-15 op err(1, "cannot open config %s", path);
931 15902770 2021-01-15 op fclose(yyin);
933 15902770 2021-01-15 op if (goterror)
938 15902770 2021-01-15 op load_vhosts(struct tls_config *tlsconf)
940 15902770 2021-01-15 op struct vhost *h;
942 15902770 2021-01-15 op /* we need to set something, then we can add how many key we want */
943 15902770 2021-01-15 op if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
944 15902770 2021-01-15 op errx(1, "tls_config_set_keypair_file failed");
946 15902770 2021-01-15 op for (h = hosts; h->domain != NULL; ++h) {
947 15902770 2021-01-15 op if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
948 15902770 2021-01-15 op errx(1, "failed to load the keypair (%s, %s)",
949 15902770 2021-01-15 op h->cert, h->key);
951 15902770 2021-01-15 op if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
952 15902770 2021-01-15 op err(1, "open %s for domain %s", h->dir, h->domain);
957 3e4749f7 2020-10-02 op usage(const char *me)
959 3e4749f7 2020-10-02 op fprintf(stderr,
960 15902770 2021-01-15 op "USAGE: %s [-n] [-c config] | [-6fh] [-C cert] [-d root] [-K key] "
961 15902770 2021-01-15 op "[-p port] [-x cgi-bin]\n",
966 3e4749f7 2020-10-02 op main(int argc, char **argv)
968 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
969 15902770 2021-01-15 op struct tls_config *tlsconf;
970 15902770 2021-01-15 op int sock4, sock6, ch;
971 15902770 2021-01-15 op const char *config_path = NULL;
973 dafb57b8 2021-01-15 op int conftest = 0;
975 15902770 2021-01-15 op bzero(hosts, sizeof(hosts));
976 15902770 2021-01-15 op for (i = 0; i < HOSTSLEN; ++i)
977 15902770 2021-01-15 op hosts[i].dirfd = -1;
979 15902770 2021-01-15 op conf.foreground = 1;
980 15902770 2021-01-15 op conf.port = 1965;
981 15902770 2021-01-15 op conf.ipv6 = 0;
983 15902770 2021-01-15 op connected_clients = 0;
985 15902770 2021-01-15 op while ((ch = getopt(argc, argv, "6C:c:d:fhK:np:x:")) != -1) {
986 3e4749f7 2020-10-02 op switch (ch) {
988 15902770 2021-01-15 op conf.ipv6 = 1;
992 15902770 2021-01-15 op hosts[0].cert = optarg;
996 15902770 2021-01-15 op config_path = optarg;
1000 15902770 2021-01-15 op free((char*)hosts[0].dir);
1001 15902770 2021-01-15 op if ((hosts[0].dir = absolutify_path(optarg)) == NULL)
1002 231bfcdc 2020-12-21 op err(1, "absolutify_path");
1006 15902770 2021-01-15 op conf.foreground = 1;
1010 3e4749f7 2020-10-02 op usage(*argv);
1014 15902770 2021-01-15 op hosts[0].key = optarg;
1018 15902770 2021-01-15 op conftest = 1;
1022 15902770 2021-01-15 op conf.port = parse_portno(optarg);
1025 15902770 2021-01-15 op /* drop the starting / (if any) */
1026 15902770 2021-01-15 op if (*optarg == '/')
1028 15902770 2021-01-15 op hosts[0].cgi = optarg;
1032 3e4749f7 2020-10-02 op usage(*argv);
1037 15902770 2021-01-15 op if (config_path != NULL) {
1038 15902770 2021-01-15 op if (hosts[0].cert != NULL || hosts[0].key != NULL ||
1039 15902770 2021-01-15 op hosts[0].dir != NULL)
1040 15902770 2021-01-15 op errx(1, "can't specify options in conf mode");
1041 15902770 2021-01-15 op parse_conf(config_path);
1043 15902770 2021-01-15 op if (hosts[0].cert == NULL || hosts[0].key == NULL ||
1044 15902770 2021-01-15 op hosts[0].dir == NULL)
1045 15902770 2021-01-15 op errx(1, "missing cert, key or root directory to serve");
1046 15902770 2021-01-15 op hosts[0].domain = "*";
1049 15902770 2021-01-15 op if (conftest)
1050 15902770 2021-01-15 op errx(0, "config OK");
1052 4a28dd01 2020-12-28 op signal(SIGPIPE, SIG_IGN);
1053 4a28dd01 2020-12-28 op signal(SIGCHLD, SIG_IGN);
1055 4a28dd01 2020-12-28 op #ifdef SIGINFO
1056 4a28dd01 2020-12-28 op signal(SIGINFO, sig_handler);
1058 4a28dd01 2020-12-28 op signal(SIGUSR2, sig_handler);
1060 15902770 2021-01-15 op if (!conf.foreground)
1061 4a28dd01 2020-12-28 op signal(SIGHUP, SIG_IGN);
1063 15902770 2021-01-15 op if ((tlsconf = tls_config_new()) == NULL)
1064 3e4749f7 2020-10-02 op err(1, "tls_config_new");
1066 677afbd3 2020-12-02 op /* optionally accept client certs, but don't try to verify them */
1067 15902770 2021-01-15 op tls_config_verify_client_optional(tlsconf);
1068 15902770 2021-01-15 op tls_config_insecure_noverifycert(tlsconf);
1070 15902770 2021-01-15 op if (tls_config_set_protocols(tlsconf,
1071 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
1072 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
1074 15902770 2021-01-15 op load_vhosts(tlsconf);
1076 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
1077 3e4749f7 2020-10-02 op err(1, "tls_server");
1079 15902770 2021-01-15 op if (tls_configure(ctx, tlsconf) == -1)
1080 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1082 15902770 2021-01-15 op sock4 = make_socket(conf.port, AF_INET);
1083 15902770 2021-01-15 op if (conf.ipv6)
1084 15902770 2021-01-15 op sock6 = make_socket(conf.port, AF_INET6);
1088 15902770 2021-01-15 op if (!conf.foreground && daemon(0, 1) == -1)
1093 33756bd2 2021-01-10 op loop(ctx, sock4, sock6);
1095 33756bd2 2021-01-10 op close(sock4);
1096 33756bd2 2021-01-10 op close(sock6);
1097 3e4749f7 2020-10-02 op tls_free(ctx);
1098 15902770 2021-01-15 op tls_config_free(tlsconf);
