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/socket.h>
19 3e4749f7 2020-10-02 op #include <sys/stat.h>
21 2c3a40fa 2020-11-06 op #include <arpa/inet.h>
22 3e4749f7 2020-10-02 op #include <netinet/in.h>
24 3e4749f7 2020-10-02 op #include <assert.h>
25 3e4749f7 2020-10-02 op #include <err.h>
26 592fd624 2020-10-07 op #include <errno.h>
27 3e4749f7 2020-10-02 op #include <fcntl.h>
28 592fd624 2020-10-07 op #include <poll.h>
29 0cf902af 2020-11-03 op #include <signal.h>
30 3e4749f7 2020-10-02 op #include <stdio.h>
31 3e4749f7 2020-10-02 op #include <stdlib.h>
32 3e4749f7 2020-10-02 op #include <string.h>
33 d7802bb4 2020-12-02 op #include <syslog.h>
34 3e4749f7 2020-10-02 op #include <tls.h>
35 3e4749f7 2020-10-02 op #include <unistd.h>
37 3e4749f7 2020-10-02 op #ifndef __OpenBSD__
38 3e4749f7 2020-10-02 op # define pledge(a, b) 0
39 3e4749f7 2020-10-02 op # define unveil(a, b) 0
40 3e4749f7 2020-10-02 op #endif /* __OpenBSD__ */
42 592fd624 2020-10-07 op #ifndef INFTIM
43 592fd624 2020-10-07 op # define INFTIM -1
44 592fd624 2020-10-07 op #endif /* INFTIM */
46 3e4749f7 2020-10-02 op #define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
48 4d4f0e19 2020-10-03 op /* large enough to hold a copy of a gemini URL and still have extra room */
49 d95b77a0 2020-10-07 op #define PATHBUF 2048
51 3e4749f7 2020-10-02 op #define SUCCESS 20
52 72342dc9 2020-11-06 op #define TEMP_FAILURE 40
53 3e4749f7 2020-10-02 op #define NOT_FOUND 51
54 3e4749f7 2020-10-02 op #define BAD_REQUEST 59
56 592fd624 2020-10-07 op #ifndef MAX_USERS
57 592fd624 2020-10-07 op #define MAX_USERS 64
60 677afbd3 2020-12-02 op #define SAFE_SETENV(var, val) do { \
61 677afbd3 2020-12-02 op const char *_tmp = (val); \
62 677afbd3 2020-12-02 op if (_tmp == NULL) \
64 677afbd3 2020-12-02 op setenv((var), _tmp, 1); \
69 592fd624 2020-10-07 op S_INITIALIZING,
74 592fd624 2020-10-07 op struct client {
75 592fd624 2020-10-07 op struct tls *ctx;
78 592fd624 2020-10-07 op const char *meta;
79 aff8d190 2020-11-06 op int fd, waiting_on_child;
81 aff8d190 2020-11-06 op char sbuf[1024]; /* static buffer */
82 aff8d190 2020-11-06 op void *buf, *i; /* mmap buffer */
83 aff8d190 2020-11-06 op ssize_t len, off; /* mmap/static buffer */
85 2c3a40fa 2020-11-06 op struct in_addr addr;
90 a5d310bc 2020-11-10 op FILE_EXECUTABLE,
91 a5d310bc 2020-11-10 op FILE_DIRECTORY,
95 cc68fe70 2020-10-07 op struct etm { /* file extension to mime */
96 cc68fe70 2020-10-07 op const char *mime;
97 cc68fe70 2020-10-07 op const char *ext;
98 cc68fe70 2020-10-07 op } filetypes[] = {
99 cc68fe70 2020-10-07 op {"application/pdf", "pdf"},
101 cc68fe70 2020-10-07 op {"image/gif", "gif"},
102 cc68fe70 2020-10-07 op {"image/jpeg", "jpg"},
103 cc68fe70 2020-10-07 op {"image/jpeg", "jpeg"},
104 cc68fe70 2020-10-07 op {"image/png", "png"},
105 cc68fe70 2020-10-07 op {"image/svg+xml", "svg"},
107 cc68fe70 2020-10-07 op {"text/gemini", "gemini"},
108 cc68fe70 2020-10-07 op {"text/gemini", "gmi"},
109 cc68fe70 2020-10-07 op {"text/markdown", "markdown"},
110 cc68fe70 2020-10-07 op {"text/markdown", "md"},
111 cc68fe70 2020-10-07 op {"text/plain", "txt"},
112 932b001a 2020-11-06 op {"text/xml", "xml"},
117 d7802bb4 2020-12-02 op #define LOG(priority, c, fmt, ...) \
119 2c3a40fa 2020-11-06 op char buf[INET_ADDRSTRLEN]; \
120 d7802bb4 2020-12-02 op if (inet_ntop((c)->af, &(c)->addr, \
121 d7802bb4 2020-12-02 op buf, sizeof(buf)) == NULL) \
122 d7802bb4 2020-12-02 op FATAL("inet_ntop: %s", strerror(errno)); \
123 d7802bb4 2020-12-02 op if (foreground) \
124 d7802bb4 2020-12-02 op fprintf(stderr, \
125 d7802bb4 2020-12-02 op "%s " fmt "\n", buf, __VA_ARGS__); \
127 d7802bb4 2020-12-02 op syslog((priority) | LOG_DAEMON, \
128 d7802bb4 2020-12-02 op "%s " fmt, buf, __VA_ARGS__); \
131 d7802bb4 2020-12-02 op #define LOGE(c, fmt, ...) LOG(LOG_ERR, c, fmt, __VA_ARGS__)
132 d7802bb4 2020-12-02 op #define LOGN(c, fmt, ...) LOG(LOG_NOTICE, c, fmt, __VA_ARGS__)
133 d7802bb4 2020-12-02 op #define LOGI(c, fmt, ...) LOG(LOG_INFO, c, fmt, __VA_ARGS__)
134 d7802bb4 2020-12-02 op #define LOGD(c, fmt, ...) LOG(LOG_DEBUG, c, fmt, __VA_ARGS__)
136 d7802bb4 2020-12-02 op #define FATAL(fmt, ...) \
138 d7802bb4 2020-12-02 op if (foreground) \
139 d7802bb4 2020-12-02 op fprintf(stderr, fmt "\n", __VA_ARGS__); \
141 d7802bb4 2020-12-02 op syslog(LOG_DAEMON | LOG_CRIT, \
142 d7802bb4 2020-12-02 op fmt, __VA_ARGS__); \
146 d7802bb4 2020-12-02 op const char *dir, *cgi;
149 d7802bb4 2020-12-02 op int foreground;
150 120381c9 2020-11-06 op int connected_clients;
152 120381c9 2020-11-06 op void siginfo_handler(int);
153 72f653b6 2020-11-06 op int starts_with(const char*, const char*);
155 592fd624 2020-10-07 op char *url_after_proto(char*);
156 592fd624 2020-10-07 op char *url_start_of_request(char*);
157 2c3a40fa 2020-11-06 op int url_trim(struct client*, char*);
158 aa0fe0cf 2020-11-06 op char *adjust_path(char*);
159 f28f9311 2020-10-14 op ssize_t filesize(int);
161 592fd624 2020-10-07 op int start_reply(struct pollfd*, struct client*, int, const char*);
162 cc68fe70 2020-10-07 op const char *path_ext(const char*);
163 cc68fe70 2020-10-07 op const char *mime(const char*);
164 d7802bb4 2020-12-02 op int check_path(struct client*, const char*, int*);
165 a5d310bc 2020-11-10 op int check_for_cgi(char *, char*, struct pollfd*, struct client*);
166 75d233f0 2020-11-06 op int open_file(char*, char*, struct pollfd*, struct client*);
167 a5d310bc 2020-11-10 op int start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
168 aff8d190 2020-11-06 op void cgi_setpoll_on_child(struct pollfd*, struct client*);
169 aff8d190 2020-11-06 op void cgi_setpoll_on_client(struct pollfd*, struct client*);
170 72342dc9 2020-11-06 op void handle_cgi(struct pollfd*, struct client*);
171 75d233f0 2020-11-06 op void send_file(char*, char*, struct pollfd*, struct client*);
172 592fd624 2020-10-07 op void send_dir(char*, struct pollfd*, struct client*);
173 592fd624 2020-10-07 op void handle(struct pollfd*, struct client*);
175 592fd624 2020-10-07 op void mark_nonblock(int);
176 592fd624 2020-10-07 op int make_soket(int);
177 592fd624 2020-10-07 op void do_accept(int, struct tls*, struct pollfd*, struct client*);
178 592fd624 2020-10-07 op void goodbye(struct pollfd*, struct client*);
179 592fd624 2020-10-07 op void loop(struct tls*, int);
181 592fd624 2020-10-07 op void usage(const char*);
184 120381c9 2020-11-06 op siginfo_handler(int sig)
190 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
194 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
195 72f653b6 2020-11-06 op if (str[i] != prefix[i])
201 3e4749f7 2020-10-02 op url_after_proto(char *url)
204 c603f126 2020-11-18 op const char *proto = "gemini:";
205 ae2ad03e 2020-11-18 op const char *marker = "//";
207 3c19febb 2020-11-06 op /* a relative URL */
208 3e4749f7 2020-10-02 op if ((s = strstr(url, marker)) == NULL)
212 ae2ad03e 2020-11-18 op * if a protocol is not specified, gemini should be implied:
213 ae2ad03e 2020-11-18 op * this handles the case of //example.com
215 ae2ad03e 2020-11-18 op if (s == url)
216 ae2ad03e 2020-11-18 op return s + strlen(marker);
218 3c19febb 2020-11-06 op if (s - strlen(proto) != url)
221 72f653b6 2020-11-06 op if (!starts_with(url, proto))
224 3e4749f7 2020-10-02 op return s + strlen(marker);
228 3e4749f7 2020-10-02 op url_start_of_request(char *url)
232 3e4749f7 2020-10-02 op if ((s = url_after_proto(url)) == NULL)
235 7cd6880b 2020-11-18 op /* non-absolute URL */
236 7cd6880b 2020-11-18 op if (s == url)
239 3e4749f7 2020-10-02 op if ((t = strstr(s, "/")) == NULL)
240 3e4749f7 2020-10-02 op return s + strlen(s);
245 2c3a40fa 2020-11-06 op url_trim(struct client *c, char *url)
247 3e4749f7 2020-10-02 op const char *e = "\r\n";
250 3e4749f7 2020-10-02 op if ((s = strstr(url, e)) == NULL)
255 3e4749f7 2020-10-02 op if (s[2] != '\0') {
256 d7802bb4 2020-12-02 op LOGE(c, "%s", "request longer than 1024 bytes");
264 3e4749f7 2020-10-02 op adjust_path(char *path)
266 aa0fe0cf 2020-11-06 op char *s, *query;
269 aa0fe0cf 2020-11-06 op if ((query = strchr(path, '?')) != NULL) {
270 aa0fe0cf 2020-11-06 op *query = '\0';
274 f28f9311 2020-10-14 op /* /.. -> / */
275 3e4749f7 2020-10-02 op len = strlen(path);
276 3e4749f7 2020-10-02 op if (len >= 3) {
277 3e4749f7 2020-10-02 op if (!strcmp(&path[len-3], "/..")) {
278 3e4749f7 2020-10-02 op path[len-2] = '\0';
282 3e4749f7 2020-10-02 op /* if the path is only `..` trim out and exit */
283 3e4749f7 2020-10-02 op if (!strcmp(path, "..")) {
284 3e4749f7 2020-10-02 op path[0] = '\0';
285 aa0fe0cf 2020-11-06 op return query;
288 3e4749f7 2020-10-02 op /* remove every ../ in the path */
290 3e4749f7 2020-10-02 op if ((s = strstr(path, "../")) == NULL)
291 aa0fe0cf 2020-11-06 op return query;
292 67328d23 2020-10-03 op memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
297 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
299 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
303 592fd624 2020-10-07 op client->code = code;
304 592fd624 2020-10-07 op client->meta = reason;
305 592fd624 2020-10-07 op client->state = S_INITIALIZING;
307 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
308 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
309 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
310 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
311 592fd624 2020-10-07 op pfd->events = POLLIN;
315 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
316 592fd624 2020-10-07 op pfd->events = POLLOUT;
324 f28f9311 2020-10-14 op filesize(int fd)
328 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
330 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
336 cc68fe70 2020-10-07 op path_ext(const char *path)
338 cc68fe70 2020-10-07 op const char *end;
340 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
341 cc68fe70 2020-10-07 op for (; end != path; --end) {
342 cc68fe70 2020-10-07 op if (*end == '.')
343 cc68fe70 2020-10-07 op return end+1;
344 cc68fe70 2020-10-07 op if (*end == '/')
352 cc68fe70 2020-10-07 op mime(const char *path)
354 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
355 cc68fe70 2020-10-07 op struct etm *t;
357 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
360 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
361 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
362 cc68fe70 2020-10-07 op return t->mime;
368 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
370 72342dc9 2020-11-06 op struct stat sb;
372 f28f9311 2020-10-14 op assert(path != NULL);
373 a5d310bc 2020-11-10 op if ((*fd = openat(dirfd, path,
374 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
375 a5d310bc 2020-11-10 op return FILE_MISSING;
378 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
379 d7802bb4 2020-12-02 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
380 a5d310bc 2020-11-10 op return FILE_MISSING;
383 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
384 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
386 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
387 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
389 a5d310bc 2020-11-10 op return FILE_EXISTS;
393 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
394 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
395 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
396 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
397 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
400 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
403 a5d310bc 2020-11-10 op end = strchr(path, '\0');
405 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
407 a5d310bc 2020-11-10 op while (end > path) {
408 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
409 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
410 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
411 a5d310bc 2020-11-10 op while (*end != '/')
415 d7802bb4 2020-12-02 op switch (check_path(c, path, &c->fd)) {
416 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
417 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
418 a5d310bc 2020-11-10 op case FILE_MISSING:
429 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
431 a5d310bc 2020-11-10 op goodbye(fds, c);
437 a5d310bc 2020-11-10 op open_file(char *path, char *query, struct pollfd *fds, struct client *c)
439 a5d310bc 2020-11-10 op char fpath[PATHBUF];
441 f28f9311 2020-10-14 op bzero(fpath, sizeof(fpath));
443 f28f9311 2020-10-14 op if (*path != '.')
444 f28f9311 2020-10-14 op fpath[0] = '.';
445 f28f9311 2020-10-14 op strlcat(fpath, path, PATHBUF);
447 d7802bb4 2020-12-02 op switch (check_path(c, fpath, &c->fd)) {
448 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
449 a5d310bc 2020-11-10 op /* +2 to skip the ./ */
450 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
451 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
453 a5d310bc 2020-11-10 op /* fallthrough */
455 a5d310bc 2020-11-10 op case FILE_EXISTS:
456 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
457 d7802bb4 2020-12-02 op LOGE(c, "failed to get file size for %s", fpath);
458 a5d310bc 2020-11-10 op goodbye(fds, c);
462 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
463 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
464 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
465 a5d310bc 2020-11-10 op goodbye(fds, c);
468 a5d310bc 2020-11-10 op c->i = c->buf;
469 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
471 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
472 d7802bb4 2020-12-02 op LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
473 f28f9311 2020-10-14 op close(c->fd);
475 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
478 a5d310bc 2020-11-10 op case FILE_MISSING:
479 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
480 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
482 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
484 f28f9311 2020-10-14 op goodbye(fds, c);
488 a5d310bc 2020-11-10 op /* unreachable */
494 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
495 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
498 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
500 72342dc9 2020-11-06 op if (pipe(p) == -1)
503 72342dc9 2020-11-06 op switch (pid = fork()) {
507 a5d310bc 2020-11-10 op case 0: { /* child */
508 721e2325 2020-11-18 op char *ex, *requri, *portno;
509 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
510 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
515 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
516 72342dc9 2020-11-06 op goto childerr;
518 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
519 a5d310bc 2020-11-10 op goto childerr;
521 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
522 721e2325 2020-11-18 op goto childerr;
524 a5d310bc 2020-11-10 op if (asprintf(&ex, "%s%s", dir, spath+1) == -1)
525 72342dc9 2020-11-06 op goto childerr;
527 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
528 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
529 a5d310bc 2020-11-10 op relpath) == -1)
530 a5d310bc 2020-11-10 op goto childerr;
532 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
534 60ba426e 2020-11-06 op /* fix the env */
535 677afbd3 2020-12-02 op SAFE_SETENV("GATEWAY_INTERFACE", "CGI/1.1");
536 677afbd3 2020-12-02 op SAFE_SETENV("SERVER_SOFTWARE", "gmid");
537 677afbd3 2020-12-02 op SAFE_SETENV("SERVER_PORT", portno);
538 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
539 677afbd3 2020-12-02 op SAFE_SETENV("SCRIPT_NAME", spath);
540 677afbd3 2020-12-02 op SAFE_SETENV("SCRIPT_EXECUTABLE", ex);
541 677afbd3 2020-12-02 op SAFE_SETENV("REQUEST_URI", requri);
542 677afbd3 2020-12-02 op SAFE_SETENV("REQUEST_RELATIVE", relpath);
543 677afbd3 2020-12-02 op SAFE_SETENV("QUERY_STRING", query);
544 677afbd3 2020-12-02 op SAFE_SETENV("REMOTE_HOST", addr);
545 677afbd3 2020-12-02 op SAFE_SETENV("REMOTE_ADDR", addr);
546 677afbd3 2020-12-02 op SAFE_SETENV("DOCUMENT_ROOT", dir);
548 677afbd3 2020-12-02 op if (tls_peer_cert_provided(c->ctx)) {
549 677afbd3 2020-12-02 op SAFE_SETENV("AUTH_TYPE", "Certificate");
550 677afbd3 2020-12-02 op SAFE_SETENV("REMOTE_USER", tls_peer_cert_subject(c->ctx));
551 677afbd3 2020-12-02 op SAFE_SETENV("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
552 677afbd3 2020-12-02 op SAFE_SETENV("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
555 a5d310bc 2020-11-10 op execvp(ex, argv);
556 72342dc9 2020-11-06 op goto childerr;
559 72342dc9 2020-11-06 op default: /* parent */
561 72342dc9 2020-11-06 op close(c->fd);
562 72342dc9 2020-11-06 op c->fd = p[0];
563 72342dc9 2020-11-06 op c->child = pid;
564 aff8d190 2020-11-06 op mark_nonblock(c->fd);
565 aff8d190 2020-11-06 op c->state = S_SENDING;
566 72342dc9 2020-11-06 op handle_cgi(fds, c);
571 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
573 72342dc9 2020-11-06 op goodbye(fds, c);
577 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
583 aff8d190 2020-11-06 op cgi_setpoll_on_child(struct pollfd *fds, struct client *c)
587 aff8d190 2020-11-06 op if (c->waiting_on_child)
589 aff8d190 2020-11-06 op c->waiting_on_child = 1;
591 aff8d190 2020-11-06 op fds->events = POLLIN;
593 aff8d190 2020-11-06 op fd = fds->fd;
594 aff8d190 2020-11-06 op fds->fd = c->fd;
599 aff8d190 2020-11-06 op cgi_setpoll_on_client(struct pollfd *fds, struct client *c)
603 aff8d190 2020-11-06 op if (!c->waiting_on_child)
605 aff8d190 2020-11-06 op c->waiting_on_child = 0;
607 aff8d190 2020-11-06 op fd = fds->fd;
608 aff8d190 2020-11-06 op fds->fd = c->fd;
613 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
617 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
618 aff8d190 2020-11-06 op cgi_setpoll_on_client(fds, c);
621 aff8d190 2020-11-06 op if (c->len == 0) {
622 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
624 aff8d190 2020-11-06 op if (r == -1) {
625 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
626 aff8d190 2020-11-06 op cgi_setpoll_on_child(fds, c);
635 aff8d190 2020-11-06 op while (c->len > 0) {
636 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
640 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
641 aff8d190 2020-11-06 op fds->events = POLLOUT;
644 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
645 aff8d190 2020-11-06 op fds->events = POLLIN;
657 72342dc9 2020-11-06 op goodbye(fds, c);
661 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
663 f28f9311 2020-10-14 op ssize_t ret, len;
665 f28f9311 2020-10-14 op if (c->fd == -1) {
666 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
668 f28f9311 2020-10-14 op c->state = S_SENDING;
671 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
673 f28f9311 2020-10-14 op while (len > 0) {
674 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
676 d7802bb4 2020-12-02 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
677 f28f9311 2020-10-14 op goodbye(fds, c);
680 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
681 f28f9311 2020-10-14 op fds->events = POLLIN;
684 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
685 f28f9311 2020-10-14 op fds->events = POLLOUT;
695 f28f9311 2020-10-14 op goodbye(fds, c);
699 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
701 3e4749f7 2020-10-02 op char fpath[PATHBUF];
704 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
706 9c56b0a7 2020-10-14 op if (path[0] != '.')
707 3e4749f7 2020-10-02 op fpath[0] = '.';
709 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
710 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
711 3e4749f7 2020-10-02 op len = strlen(fpath);
713 3e4749f7 2020-10-02 op /* add a trailing / in case. */
714 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
715 3e4749f7 2020-10-02 op fpath[len] = '/';
718 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
720 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
724 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
726 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
730 592fd624 2020-10-07 op switch (client->state) {
732 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
733 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
735 d7802bb4 2020-12-02 op LOGE(client, "tls_read: %s", tls_error(client->ctx));
736 592fd624 2020-10-07 op goodbye(fds, client);
739 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
740 592fd624 2020-10-07 op fds->events = POLLIN;
743 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
744 592fd624 2020-10-07 op fds->events = POLLOUT;
748 2c3a40fa 2020-11-06 op if (!url_trim(client, buf)) {
749 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
751 592fd624 2020-10-07 op goodbye(fds, client);
755 592fd624 2020-10-07 op if ((path = url_start_of_request(buf)) == NULL) {
756 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
758 592fd624 2020-10-07 op goodbye(fds, client);
762 aa0fe0cf 2020-11-06 op query = adjust_path(path);
763 d7802bb4 2020-12-02 op LOGI(client, "GET %s%s%s", path,
764 aa0fe0cf 2020-11-06 op query ? "?" : "",
765 aa0fe0cf 2020-11-06 op query ? query : "");
767 a5d310bc 2020-11-10 op send_file(path, query, fds, client);
770 592fd624 2020-10-07 op case S_INITIALIZING:
771 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
774 592fd624 2020-10-07 op if (client->code != SUCCESS) {
775 592fd624 2020-10-07 op /* we don't need a body */
776 592fd624 2020-10-07 op goodbye(fds, client);
780 592fd624 2020-10-07 op client->state = S_SENDING;
782 592fd624 2020-10-07 op /* fallthrough */
784 592fd624 2020-10-07 op case S_SENDING:
785 aff8d190 2020-11-06 op if (client->child != -1)
786 aff8d190 2020-11-06 op handle_cgi(fds, client);
788 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
791 592fd624 2020-10-07 op case S_CLOSING:
792 592fd624 2020-10-07 op goodbye(fds, client);
796 592fd624 2020-10-07 op /* unreachable */
802 592fd624 2020-10-07 op mark_nonblock(int fd)
806 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
807 d7802bb4 2020-12-02 op FATAL("fcntl(F_GETFL): %s", strerror(errno));
808 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
809 d7802bb4 2020-12-02 op FATAL("fcntl(F_SETFL): %s", strerror(errno));
813 9468027b 2020-10-15 op make_socket(int port, int family)
816 9468027b 2020-10-15 op struct sockaddr_in addr4;
817 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
818 9468027b 2020-10-15 op struct sockaddr *addr;
819 9468027b 2020-10-15 op socklen_t len;
821 9468027b 2020-10-15 op switch (family) {
822 9468027b 2020-10-15 op case AF_INET:
823 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
824 9468027b 2020-10-15 op addr4.sin_family = family;
825 9468027b 2020-10-15 op addr4.sin_port = htons(port);
826 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
827 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
828 9468027b 2020-10-15 op len = sizeof(addr4);
831 9468027b 2020-10-15 op case AF_INET6:
832 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
833 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
834 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
835 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
836 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
837 9468027b 2020-10-15 op len = sizeof(addr6);
841 9468027b 2020-10-15 op /* unreachable */
845 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
846 d7802bb4 2020-12-02 op FATAL("socket: %s", strerror(errno));
849 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
850 d7802bb4 2020-12-02 op FATAL("setsockopt(SO_REUSEADDR): %s", strerror(errno));
853 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
854 d7802bb4 2020-12-02 op FATAL("setsockopt(SO_REUSEPORT): %s", strerror(errno));
856 592fd624 2020-10-07 op mark_nonblock(sock);
858 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
859 d7802bb4 2020-12-02 op FATAL("bind: %s", strerror(errno));
861 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
862 d7802bb4 2020-12-02 op FATAL("listen: %s", strerror(errno));
868 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
871 592fd624 2020-10-07 op struct sockaddr_in addr;
872 3e4749f7 2020-10-02 op socklen_t len;
874 592fd624 2020-10-07 op len = sizeof(addr);
875 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
876 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
878 d7802bb4 2020-12-02 op FATAL("accept: %s", strerror(errno));
881 592fd624 2020-10-07 op mark_nonblock(fd);
883 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
884 592fd624 2020-10-07 op if (fds[i].fd == -1) {
885 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
886 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
887 592fd624 2020-10-07 op break; /* goodbye fd! */
889 592fd624 2020-10-07 op fds[i].fd = fd;
890 592fd624 2020-10-07 op fds[i].events = POLLIN;
892 592fd624 2020-10-07 op clients[i].state = S_OPEN;
893 592fd624 2020-10-07 op clients[i].fd = -1;
894 72342dc9 2020-11-06 op clients[i].child = -1;
895 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
896 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
897 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
899 120381c9 2020-11-06 op connected_clients++;
908 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
912 592fd624 2020-10-07 op c->state = S_CLOSING;
914 592fd624 2020-10-07 op ret = tls_close(c->ctx);
915 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
916 592fd624 2020-10-07 op pfd->events = POLLIN;
919 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
920 592fd624 2020-10-07 op pfd->events = POLLOUT;
924 120381c9 2020-11-06 op connected_clients--;
926 592fd624 2020-10-07 op tls_free(c->ctx);
927 592fd624 2020-10-07 op c->ctx = NULL;
929 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
930 f28f9311 2020-10-14 op munmap(c->buf, c->len);
932 592fd624 2020-10-07 op if (c->fd != -1)
933 592fd624 2020-10-07 op close(c->fd);
935 592fd624 2020-10-07 op close(pfd->fd);
936 592fd624 2020-10-07 op pfd->fd = -1;
940 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
943 592fd624 2020-10-07 op struct client clients[MAX_USERS];
944 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
946 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
947 592fd624 2020-10-07 op fds[i].fd = -1;
948 592fd624 2020-10-07 op fds[i].events = POLLIN;
949 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
952 592fd624 2020-10-07 op fds[0].fd = sock;
955 120381c9 2020-11-06 op if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1) {
956 120381c9 2020-11-06 op if (errno == EINTR) {
957 d7802bb4 2020-12-02 op warnx("connected clients: %d",
958 d7802bb4 2020-12-02 op connected_clients);
961 d7802bb4 2020-12-02 op FATAL("poll: %s", strerror(errno));
964 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
965 592fd624 2020-10-07 op assert(i < MAX_USERS);
967 592fd624 2020-10-07 op if (fds[i].revents == 0)
970 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
971 d7802bb4 2020-12-02 op FATAL("bad fd %d: %s", fds[i].fd,
972 d7802bb4 2020-12-02 op strerror(errno));
974 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
975 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
976 aff8d190 2020-11-06 op * of a cgi script that has exited. */
977 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
978 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
985 592fd624 2020-10-07 op if (i == 0) { /* new client */
986 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
990 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
996 3e4749f7 2020-10-02 op usage(const char *me)
998 3e4749f7 2020-10-02 op fprintf(stderr,
999 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
1000 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
1005 3e4749f7 2020-10-02 op main(int argc, char **argv)
1007 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
1008 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
1009 3e4749f7 2020-10-02 op struct tls_config *conf;
1010 3e4749f7 2020-10-02 op int sock, ch;
1012 0cf902af 2020-11-03 op signal(SIGPIPE, SIG_IGN);
1013 72342dc9 2020-11-06 op signal(SIGCHLD, SIG_IGN);
1015 120381c9 2020-11-06 op #ifdef SIGINFO
1016 120381c9 2020-11-06 op signal(SIGINFO, siginfo_handler);
1018 120381c9 2020-11-06 op signal(SIGUSR2, siginfo_handler);
1020 120381c9 2020-11-06 op connected_clients = 0;
1022 72342dc9 2020-11-06 op dir = "docs/";
1024 721e2325 2020-11-18 op port = 1965;
1025 d7802bb4 2020-12-02 op foreground = 0;
1027 d7802bb4 2020-12-02 op while ((ch = getopt(argc, argv, "c:d:fhk:p:x:")) != -1) {
1028 3e4749f7 2020-10-02 op switch (ch) {
1030 3e4749f7 2020-10-02 op cert = optarg;
1034 3e4749f7 2020-10-02 op dir = optarg;
1038 d7802bb4 2020-12-02 op foreground = 1;
1042 3e4749f7 2020-10-02 op usage(*argv);
1046 3e4749f7 2020-10-02 op key = optarg;
1054 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
1055 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
1056 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
1057 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
1058 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
1059 721e2325 2020-11-18 op port = lval;
1064 72f653b6 2020-11-06 op cgi = optarg;
1068 3e4749f7 2020-10-02 op usage(*argv);
1073 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
1074 3e4749f7 2020-10-02 op err(1, "tls_config_new");
1076 677afbd3 2020-12-02 op /* optionally accept client certs, but don't try to verify them */
1077 677afbd3 2020-12-02 op tls_config_verify_client_optional(conf);
1078 677afbd3 2020-12-02 op tls_config_insecure_noverifycert(conf);
1080 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
1081 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
1082 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
1084 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
1085 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
1087 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
1088 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
1090 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
1091 3e4749f7 2020-10-02 op err(1, "tls_server");
1093 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
1094 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1096 721e2325 2020-11-18 op sock = make_socket(port, AF_INET);
1098 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
1099 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
1101 d7802bb4 2020-12-02 op if (!foreground && daemon(0, 1) == -1)
1104 72f653b6 2020-11-06 op if (cgi != NULL) {
1105 72f653b6 2020-11-06 op if (unveil(dir, "rx") == -1)
1106 72f653b6 2020-11-06 op err(1, "unveil");
1107 72f653b6 2020-11-06 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
1108 72f653b6 2020-11-06 op err(1, "pledge");
1110 72f653b6 2020-11-06 op if (unveil(dir, "r") == -1)
1111 72f653b6 2020-11-06 op err(1, "unveil");
1112 72f653b6 2020-11-06 op if (pledge("stdio rpath inet", NULL) == -1)
1113 72f653b6 2020-11-06 op err(1, "pledge");
1116 3e4749f7 2020-10-02 op loop(ctx, sock);
1118 3e4749f7 2020-10-02 op close(sock);
1119 3e4749f7 2020-10-02 op tls_free(ctx);
1120 3e4749f7 2020-10-02 op tls_config_free(conf);
