1 /*
2  * Copyright (c) 2016, 2019, 2020-2022 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
4  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
5  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 #include <netinet/in.h>
21 #include <net/if.h>
22 #include <sys/queue.h>
23 
24 #include <limits.h>
25 #include <stdio.h>
26 
27 #ifdef DEBUG
28 #define dprintf(x...)   do { log_debug(x); } while(0)
29 #else
30 #define dprintf(x...)
31 #endif /* DEBUG */
32 
33 #ifndef nitems
34 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
35 #endif
36 
37 /* GOTWEBD DEFAULTS */
38 #define GOTWEBD_CONF		 "/etc/gotwebd.conf"
39 
40 #define GOTWEBD_USER		 "www"
41 
42 #define GOTWEBD_MAXDESCRSZ	 1024
43 #define GOTWEBD_MAXCLONEURLSZ	 1024
44 #define GOTWEBD_CACHESIZE	 1024
45 #define GOTWEBD_MAXCLIENTS	 1024
46 #define GOTWEBD_MAXTEXT		 511
47 #define GOTWEBD_MAXNAME		 64
48 #define GOTWEBD_MAXPORT		 6
49 #define GOTWEBD_NUMPROC		 3
50 #define GOTWEBD_SOCK_FILENO	 3
51 
52 #define PROC_MAX_INSTANCES	 32
53 
54 /* GOTWEB DEFAULTS */
55 #define MAX_QUERYSTRING		 2048
56 #define MAX_DOCUMENT_URI	 255
57 #define MAX_SERVER_NAME		 255
58 
59 #define GOTWEB_GIT_DIR		 ".git"
60 
61 #define D_HTTPD_CHROOT		 "/var/www"
62 #define D_UNIX_SOCKET		 "/run/gotweb.sock"
63 #define D_FCGI_PORT		 "9000"
64 #define D_GOTPATH		 "/got/public"
65 #define D_SITENAME		 "Gotweb"
66 #define D_SITEOWNER		 "Got Owner"
67 #define D_SITELINK		 "Repos"
68 #define D_GOTLOGO		 "got.png"
69 #define D_GOTURL		 "https://gameoftrees.org"
70 #define D_GOTWEBCSS		 "gotweb.css"
71 
72 #define D_SHOWROWNER		 1
73 #define D_SHOWSOWNER		 1
74 #define D_SHOWAGE		 1
75 #define D_SHOWDESC		 1
76 #define D_SHOWURL		 1
77 #define D_RESPECTEXPORTOK	 0
78 #define D_MAXREPO		 0
79 #define D_MAXREPODISP		 25
80 #define D_MAXSLCOMMDISP		 10
81 #define D_MAXCOMMITDISP		 25
82 
83 #define BUF			 8192
84 
85 #define TIMEOUT_DEFAULT		 120
86 
87 #define FCGI_CONTENT_SIZE	 65535
88 #define FCGI_PADDING_SIZE	 255
89 #define FCGI_RECORD_SIZE	 \
90     (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
91 
92 #define FCGI_ALIGNMENT		 8
93 #define FCGI_ALIGN(n)		 \
94     (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
95 
96 #define FD_RESERVE		 5
97 #define FD_NEEDED		 6
98 
99 #define FCGI_BEGIN_REQUEST	 1
100 #define FCGI_ABORT_REQUEST	 2
101 #define FCGI_END_REQUEST	 3
102 #define FCGI_PARAMS		 4
103 #define FCGI_STDIN		 5
104 #define FCGI_STDOUT		 6
105 #define FCGI_STDERR		 7
106 #define FCGI_DATA		 8
107 #define FCGI_GET_VALUES		 9
108 #define FCGI_GET_VALUES_RESULT	10
109 #define FCGI_UNKNOWN_TYPE	11
110 #define FCGI_MAXTYPE		(FCGI_UNKNOWN_TYPE)
111 
112 #define FCGI_REQUEST_COMPLETE	0
113 #define FCGI_CANT_MPX_CONN	1
114 #define FCGI_OVERLOADED		2
115 #define FCGI_UNKNOWN_ROLE	3
116 
117 #define GOTWEB_PACK_NUM_TEMPFILES     (32 * 2)
118 
119 /* Forward declaration */
120 struct got_blob_object;
121 struct got_tree_entry;
122 struct got_reflist_head;
123 
124 enum imsg_type {
125 	IMSG_CFG_SRV,
126 	IMSG_CFG_SOCK,
127 	IMSG_CFG_FD,
128 	IMSG_CFG_DONE,
129 	IMSG_CTL_START,
130 };
131 
132 struct imsgev {
133 	struct imsgbuf		 ibuf;
134 	void			(*handler)(int, short, void *);
135 	struct event		 ev;
136 	void			*data;
137 	short			 events;
138 };
139 
140 #define IMSG_SIZE_CHECK(imsg, p) do {					\
141 	if (IMSG_DATA_SIZE(imsg) < sizeof(*p))				\
142 		fatalx("bad length imsg received (%s)",	#p);		\
143 } while (0)
144 
145 #define IMSG_DATA_SIZE(imsg)	((imsg)->hdr.len - IMSG_HEADER_SIZE)
146 
147 struct env_val {
148 	SLIST_ENTRY(env_val)	 entry;
149 	char			*val;
150 };
151 SLIST_HEAD(env_head, env_val);
152 
153 struct fcgi_record_header {
154 	uint8_t		version;
155 	uint8_t		type;
156 	uint16_t	id;
157 	uint16_t	content_len;
158 	uint8_t		padding_len;
159 	uint8_t		reserved;
160 }__attribute__((__packed__));
161 
162 struct blame_line {
163 	int		 annotated;
164 	char		*id_str;
165 	char		*committer;
166 	char		 datebuf[11]; /* YYYY-MM-DD + NUL */
167 };
168 
169 struct repo_dir {
170 	char			*name;
171 	char			*owner;
172 	char			*description;
173 	char			*url;
174 	time_t			 age;
175 	char			*path;
176 };
177 
178 struct repo_tag {
179 	TAILQ_ENTRY(repo_tag)	 entry;
180 	char			*commit_id;
181 	char			*tag_name;
182 	char			*tag_commit;
183 	char			*commit_msg;
184 	char			*tagger;
185 	time_t			 tagger_time;
186 };
187 
188 struct repo_commit {
189 	TAILQ_ENTRY(repo_commit)	 entry;
190 	char			*path;
191 	char			*refs_str;
192 	char			*commit_id; /* id_str1 */
193 	char			*parent_id; /* id_str2 */
194 	char			*tree_id;
195 	char			*author;
196 	char			*committer;
197 	char			*commit_msg;
198 	time_t			 committer_time;
199 };
200 
201 struct got_repository;
202 struct transport {
203 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
204 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
205 	struct got_reflist_head	 refs;
206 	struct got_repository	*repo;
207 	struct repo_dir		*repo_dir;
208 	struct querystring	*qs;
209 	char			*more_id;
210 	char			*next_id;
211 	char			*prev_id;
212 	unsigned int		 repos_total;
213 	unsigned int		 next_disp;
214 	unsigned int		 prev_disp;
215 	unsigned int		 tag_count;
216 	const struct got_error	*error;
217 	struct got_blob_object	*blob;
218 	int			 fd;
219 	FILE			*fp;
220 	struct dirent		**repos;
221 	int			 nrepos;
222 };
223 
224 enum socket_priv_fds {
225 	DIFF_FD_1,
226 	DIFF_FD_2,
227 	DIFF_FD_3,
228 	DIFF_FD_4,
229 	DIFF_FD_5,
230 	BLAME_FD_1,
231 	BLAME_FD_2,
232 	BLAME_FD_3,
233 	BLAME_FD_4,
234 	BLAME_FD_5,
235 	BLAME_FD_6,
236 	BLOB_FD_1,
237 	BLOB_FD_2,
238 	PRIV_FDS__MAX,
239 };
240 
241 struct template;
242 struct request {
243 	struct socket			*sock;
244 	struct server			*srv;
245 	struct transport		*t;
246 	struct template			*tp;
247 	struct event			 ev;
248 	struct event			 tmo;
249 
250 	uint16_t			 id;
251 	int				 fd;
252 	int				 priv_fd[PRIV_FDS__MAX];
253 
254 	uint8_t				 buf[FCGI_RECORD_SIZE];
255 	size_t				 buf_pos;
256 	size_t				 buf_len;
257 
258 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
259 
260 	char				 querystring[MAX_QUERYSTRING];
261 	char				 document_uri[MAX_DOCUMENT_URI];
262 	char				 server_name[MAX_SERVER_NAME];
263 	int				 https;
264 
265 	uint8_t				 request_started;
266 };
267 
268 struct fcgi_begin_request_body {
269 	uint16_t	role;
270 	uint8_t		flags;
271 	uint8_t		reserved[5];
272 }__attribute__((__packed__));
273 
274 struct fcgi_end_request_body {
275 	uint32_t	app_status;
276 	uint8_t		protocol_status;
277 	uint8_t		reserved[3];
278 }__attribute__((__packed__));
279 
280 struct address {
281 	TAILQ_ENTRY(address)	 entry;
282 	struct sockaddr_storage	 ss;
283 	socklen_t		 slen;
284 	int			 ai_family;
285 	int			 ai_socktype;
286 	int			 ai_protocol;
287 	in_port_t		 port;
288 	char			 ifname[IFNAMSIZ];
289 };
290 TAILQ_HEAD(addresslist, address);
291 
292 struct server {
293 	TAILQ_ENTRY(server)	 entry;
294 	struct addresslist	al;
295 
296 	char		 name[GOTWEBD_MAXTEXT];
297 
298 	char		 repos_path[PATH_MAX];
299 	char		 site_name[GOTWEBD_MAXNAME];
300 	char		 site_owner[GOTWEBD_MAXNAME];
301 	char		 site_link[GOTWEBD_MAXTEXT];
302 	char		 logo[GOTWEBD_MAXTEXT];
303 	char		 logo_url[GOTWEBD_MAXTEXT];
304 	char		 custom_css[PATH_MAX];
305 
306 	size_t		 max_repos;
307 	size_t		 max_repos_display;
308 	size_t		 max_commits_display;
309 
310 	int		 show_site_owner;
311 	int		 show_repo_owner;
312 	int		 show_repo_age;
313 	int		 show_repo_description;
314 	int		 show_repo_cloneurl;
315 	int		 respect_exportok;
316 
317 	int		 unix_socket;
318 	char		 unix_socket_name[PATH_MAX];
319 
320 	int		 fcgi_socket;
321 };
322 TAILQ_HEAD(serverlist, server);
323 
324 enum client_action {
325 	CLIENT_CONNECT,
326 	CLIENT_DISCONNECT,
327 };
328 
329 struct socket_conf {
330 	struct address	 addr;
331 
332 	char		 name[GOTWEBD_MAXTEXT];
333 	char		 srv_name[GOTWEBD_MAXTEXT];
334 
335 	int		 id;
336 	int		 af_type;
337 	char		 unix_socket_name[PATH_MAX];
338 	in_port_t	 fcgi_socket_port;
339 };
340 
341 struct socket {
342 	TAILQ_ENTRY(socket)	 entry;
343 	struct socket_conf	 conf;
344 
345 	int		 fd;
346 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
347 	int		 priv_fd[PRIV_FDS__MAX];
348 
349 	struct event	 evt;
350 	struct event	 ev;
351 	struct event	 pause;
352 
353 	int		 client_status;
354 };
355 TAILQ_HEAD(socketlist, socket);
356 
357 struct passwd;
358 struct gotwebd {
359 	struct serverlist	servers;
360 	struct socketlist	sockets;
361 
362 	const char	*gotwebd_conffile;
363 
364 	int		 gotwebd_debug;
365 	int		 gotwebd_verbose;
366 
367 	struct imsgev	*iev_parent;
368 	struct imsgev	*iev_server;
369 	size_t		 nserver;
370 
371 	struct passwd	*pw;
372 
373 	uint16_t	 prefork_gotwebd;
374 	int		 gotwebd_reload;
375 
376 	int		 server_cnt;
377 
378 	char		 httpd_chroot[PATH_MAX];
379 
380 	int		 unix_socket;
381 	char		 unix_socket_name[PATH_MAX];
382 };
383 
384 /*
385  * URL parameter for gotweb_render_url.  NULL values and int set to -1
386  * are implicitly ignored, and string are properly escaped.
387  */
388 struct gotweb_url {
389 	int		 action;
390 	int		 index_page;
391 	int		 page;
392 	const char	*commit;
393 	const char	*previd;
394 	const char	*prevset;
395 	const char	*file;
396 	const char	*folder;
397 	const char	*headref;
398 	const char	*path;
399 };
400 
401 struct querystring {
402 	uint8_t		 action;
403 	char		*commit;
404 	char		*previd;
405 	char		*prevset;
406 	char		*file;
407 	char		*folder;
408 	char		*headref;
409 	int		 index_page;
410 	char		*path;
411 	int		 page;
412 };
413 
414 struct querystring_keys {
415 	const char	*name;
416 	int		 element;
417 };
418 
419 struct action_keys {
420 	const char	*name;
421 	int		 action;
422 };
423 
424 enum querystring_elements {
425 	ACTION,
426 	COMMIT,
427 	RFILE,
428 	FOLDER,
429 	HEADREF,
430 	INDEX_PAGE,
431 	PATH,
432 	PAGE,
433 };
434 
435 enum query_actions {
436 	BLAME,
437 	BLOB,
438 	BLOBRAW,
439 	BRIEFS,
440 	COMMITS,
441 	DIFF,
442 	ERR,
443 	INDEX,
444 	SUMMARY,
445 	TAG,
446 	TAGS,
447 	TREE,
448 	RSS,
449 	ACTIONS__MAX,
450 };
451 
452 extern struct gotwebd	*gotwebd_env;
453 
454 typedef int (*got_render_blame_line_cb)(struct template *, const char *,
455     struct blame_line *, int, int);
456 
457 /* gotwebd.c */
458 void	 imsg_event_add(struct imsgev *);
459 int	 imsg_compose_event(struct imsgev *, uint16_t, uint32_t,
460 	    pid_t, int, const void *, uint16_t);
461 int	 main_compose_sockets(struct gotwebd *, uint32_t, int,
462 	    const void *, uint16_t);
463 int	 sockets_compose_main(struct gotwebd *, uint32_t,
464 	    const void *, uint16_t);
465 
466 /* sockets.c */
467 void sockets(struct gotwebd *, int);
468 void sockets_parse_sockets(struct gotwebd *);
469 void sockets_socket_accept(int, short, void *);
470 int sockets_privinit(struct gotwebd *, struct socket *);
471 
472 /* gotweb.c */
473 void gotweb_get_navs(struct request *, struct gotweb_url *, int *,
474     struct gotweb_url *, int *);
475 int gotweb_render_age(struct template *, time_t);
476 const struct got_error *gotweb_init_transport(struct transport **);
477 const char *gotweb_action_name(int);
478 int gotweb_render_url(struct request *, struct gotweb_url *);
479 int gotweb_render_absolute_url(struct request *, struct gotweb_url *);
480 void gotweb_free_repo_commit(struct repo_commit *);
481 void gotweb_free_repo_tag(struct repo_tag *);
482 void gotweb_process_request(struct request *);
483 void gotweb_free_transport(struct transport *);
484 
485 /* pages.tmpl */
486 int	gotweb_render_page(struct template *, int (*)(struct template *));
487 int	gotweb_render_error(struct template *);
488 int	gotweb_render_repo_table_hdr(struct template *);
489 int	gotweb_render_repo_fragment(struct template *, struct repo_dir *);
490 int	gotweb_render_briefs(struct template *);
491 int	gotweb_render_navs(struct template *);
492 int	gotweb_render_commits(struct template *);
493 int	gotweb_render_blob(struct template *);
494 int	gotweb_render_tree(struct template *);
495 int	gotweb_render_tags(struct template *);
496 int	gotweb_render_tag(struct template *);
497 int	gotweb_render_diff(struct template *);
498 int	gotweb_render_branches(struct template *, struct got_reflist_head *);
499 int	gotweb_render_summary(struct template *);
500 int	gotweb_render_blame(struct template *);
501 int	gotweb_render_rss(struct template *);
502 
503 /* parse.y */
504 int parse_config(const char *, struct gotwebd *);
505 int cmdline_symset(char *);
506 
507 /* fcgi.c */
508 void fcgi_request(int, short, void *);
509 void fcgi_timeout(int, short, void *);
510 void fcgi_cleanup_request(struct request *);
511 void fcgi_create_end_record(struct request *);
512 void dump_fcgi_record(const char *, struct fcgi_record_header *);
513 int fcgi_write(void *, const void *, size_t);
514 
515 /* got_operations.c */
516 const struct got_error *got_gotweb_closefile(FILE *);
517 const struct got_error *got_get_repo_owner(char **, struct request *);
518 const struct got_error *got_get_repo_age(time_t *, struct request *,
519     const char *);
520 const struct got_error *got_get_repo_commits(struct request *, size_t);
521 const struct got_error *got_get_repo_tags(struct request *, size_t);
522 const struct got_error *got_get_repo_heads(struct request *);
523 const struct got_error *got_open_diff_for_output(FILE **, struct request *);
524 int got_output_repo_tree(struct request *,
525     int (*)(struct template *, struct got_tree_entry *));
526 const struct got_error *got_open_blob_for_output(struct got_blob_object **,
527     int *, int *, struct request *);
528 int got_output_blob_by_lines(struct template *, struct got_blob_object *,
529     int (*)(struct template *, const char *, size_t));
530 const struct got_error *got_output_file_blame(struct request *,
531     got_render_blame_line_cb);
532 
533 /* config.c */
534 int config_setserver(struct gotwebd *, struct server *);
535 int config_getserver(struct gotwebd *, struct imsg *);
536 int config_setsock(struct gotwebd *, struct socket *);
537 int config_getsock(struct gotwebd *, struct imsg *);
538 int config_setfd(struct gotwebd *, struct socket *);
539 int config_getfd(struct gotwebd *, struct imsg *);
540 int config_getcfg(struct gotwebd *, struct imsg *);
541 int config_init(struct gotwebd *);
542 
543 /* log.c */
544 void	log_init(int, int);
545 void	log_procinit(const char *);
546 void	log_setverbose(int);
547 int	log_getverbose(void);
548 void	log_warn(const char *, ...)
549 	    __attribute__((__format__ (printf, 1, 2)));
550 void	log_warnx(const char *, ...)
551 	    __attribute__((__format__ (printf, 1, 2)));
552 void	log_info(const char *, ...)
553 	    __attribute__((__format__ (printf, 1, 2)));
554 void	log_debug(const char *, ...)
555 	    __attribute__((__format__ (printf, 1, 2)));
556 void	logit(int, const char *, ...)
557 	    __attribute__((__format__ (printf, 2, 3)));
558 void	vlog(int, const char *, va_list)
559 	    __attribute__((__format__ (printf, 2, 0)));
560 __dead void fatal(const char *, ...)
561 	    __attribute__((__format__ (printf, 1, 2)));
562 __dead void fatalx(const char *, ...)
563 	    __attribute__((__format__ (printf, 1, 2)));