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_MAXREPODISP		 25
79 #define D_MAXSLCOMMDISP		 10
80 #define D_MAXCOMMITDISP		 25
81 #define D_MAXSLTAGDISP		 3
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_DATA_SIZE(imsg)	((imsg)->hdr.len - IMSG_HEADER_SIZE)
141 
142 struct env_val {
143 	SLIST_ENTRY(env_val)	 entry;
144 	char			*val;
145 };
146 SLIST_HEAD(env_head, env_val);
147 
148 struct fcgi_record_header {
149 	uint8_t		version;
150 	uint8_t		type;
151 	uint16_t	id;
152 	uint16_t	content_len;
153 	uint8_t		padding_len;
154 	uint8_t		reserved;
155 }__attribute__((__packed__));
156 
157 struct blame_line {
158 	int		 annotated;
159 	char		*id_str;
160 	char		*committer;
161 	char		 datebuf[11]; /* YYYY-MM-DD + NUL */
162 };
163 
164 struct repo_dir {
165 	char			*name;
166 	char			*owner;
167 	char			*description;
168 	char			*url;
169 	time_t			 age;
170 	char			*path;
171 };
172 
173 struct repo_tag {
174 	TAILQ_ENTRY(repo_tag)	 entry;
175 	char			*commit_id;
176 	char			*tag_name;
177 	char			*tag_commit;
178 	char			*commit_msg;
179 	char			*tagger;
180 	time_t			 tagger_time;
181 };
182 
183 struct repo_commit {
184 	TAILQ_ENTRY(repo_commit)	 entry;
185 	char			*path;
186 	char			*refs_str;
187 	char			*commit_id; /* id_str1 */
188 	char			*parent_id; /* id_str2 */
189 	char			*tree_id;
190 	char			*author;
191 	char			*committer;
192 	char			*commit_msg;
193 	time_t			 committer_time;
194 };
195 
196 struct got_repository;
197 struct transport {
198 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
199 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
200 	struct got_reflist_head	 refs;
201 	struct got_repository	*repo;
202 	struct repo_dir		*repo_dir;
203 	struct querystring	*qs;
204 	char			*more_id;
205 	char			*tags_more_id;
206 	unsigned int		 repos_total;
207 	unsigned int		 next_disp;
208 	unsigned int		 prev_disp;
209 	unsigned int		 tag_count;
210 	const struct got_error	*error;
211 	struct got_blob_object	*blob;
212 	int			 fd;
213 	FILE			*fp;
214 	struct dirent		**repos;
215 	int			 nrepos;
216 };
217 
218 enum socket_priv_fds {
219 	DIFF_FD_1,
220 	DIFF_FD_2,
221 	DIFF_FD_3,
222 	DIFF_FD_4,
223 	DIFF_FD_5,
224 	BLAME_FD_1,
225 	BLAME_FD_2,
226 	BLAME_FD_3,
227 	BLAME_FD_4,
228 	BLAME_FD_5,
229 	BLAME_FD_6,
230 	BLOB_FD_1,
231 	BLOB_FD_2,
232 	PRIV_FDS__MAX,
233 };
234 
235 struct template;
236 struct request {
237 	struct socket			*sock;
238 	struct server			*srv;
239 	struct transport		*t;
240 	struct template			*tp;
241 	struct event			 ev;
242 	struct event			 tmo;
243 
244 	uint16_t			 id;
245 	int				 fd;
246 	int				 priv_fd[PRIV_FDS__MAX];
247 
248 	uint8_t				 buf[FCGI_RECORD_SIZE];
249 	size_t				 buf_pos;
250 	size_t				 buf_len;
251 
252 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
253 
254 	char				 querystring[MAX_QUERYSTRING];
255 	char				 document_uri[MAX_DOCUMENT_URI];
256 	char				 server_name[MAX_SERVER_NAME];
257 	int				 https;
258 
259 	uint8_t				 request_started;
260 };
261 
262 struct fcgi_begin_request_body {
263 	uint16_t	role;
264 	uint8_t		flags;
265 	uint8_t		reserved[5];
266 }__attribute__((__packed__));
267 
268 struct fcgi_end_request_body {
269 	uint32_t	app_status;
270 	uint8_t		protocol_status;
271 	uint8_t		reserved[3];
272 }__attribute__((__packed__));
273 
274 struct address {
275 	TAILQ_ENTRY(address)	 entry;
276 	struct sockaddr_storage	 ss;
277 	socklen_t		 slen;
278 	int			 ai_family;
279 	int			 ai_socktype;
280 	int			 ai_protocol;
281 	in_port_t		 port;
282 	char			 ifname[IFNAMSIZ];
283 };
284 TAILQ_HEAD(addresslist, address);
285 
286 struct server {
287 	TAILQ_ENTRY(server)	 entry;
288 	struct addresslist	al;
289 
290 	char		 name[GOTWEBD_MAXTEXT];
291 
292 	char		 repos_path[PATH_MAX];
293 	char		 site_name[GOTWEBD_MAXNAME];
294 	char		 site_owner[GOTWEBD_MAXNAME];
295 	char		 site_link[GOTWEBD_MAXTEXT];
296 	char		 logo[GOTWEBD_MAXTEXT];
297 	char		 logo_url[GOTWEBD_MAXTEXT];
298 	char		 custom_css[PATH_MAX];
299 
300 	size_t		 max_repos_display;
301 	size_t		 max_commits_display;
302 	size_t		 summary_commits_display;
303 	size_t		 summary_tags_display;
304 
305 	int		 show_site_owner;
306 	int		 show_repo_owner;
307 	int		 show_repo_age;
308 	int		 show_repo_description;
309 	int		 show_repo_cloneurl;
310 	int		 respect_exportok;
311 
312 	int		 unix_socket;
313 	char		 unix_socket_name[PATH_MAX];
314 
315 	int		 fcgi_socket;
316 };
317 TAILQ_HEAD(serverlist, server);
318 
319 enum client_action {
320 	CLIENT_CONNECT,
321 	CLIENT_DISCONNECT,
322 };
323 
324 struct socket_conf {
325 	struct address	 addr;
326 
327 	char		 name[GOTWEBD_MAXTEXT];
328 	char		 srv_name[GOTWEBD_MAXTEXT];
329 
330 	int		 id;
331 	int		 af_type;
332 	char		 unix_socket_name[PATH_MAX];
333 	in_port_t	 fcgi_socket_port;
334 };
335 
336 struct socket {
337 	TAILQ_ENTRY(socket)	 entry;
338 	struct socket_conf	 conf;
339 
340 	int		 fd;
341 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
342 	int		 priv_fd[PRIV_FDS__MAX];
343 
344 	struct event	 evt;
345 	struct event	 ev;
346 	struct event	 pause;
347 
348 	int		 client_status;
349 };
350 TAILQ_HEAD(socketlist, socket);
351 
352 struct passwd;
353 struct gotwebd {
354 	struct serverlist	servers;
355 	struct socketlist	sockets;
356 
357 	const char	*gotwebd_conffile;
358 
359 	int		 gotwebd_debug;
360 	int		 gotwebd_verbose;
361 
362 	struct imsgev	*iev_parent;
363 	struct imsgev	*iev_server;
364 	size_t		 nserver;
365 
366 	struct passwd	*pw;
367 
368 	uint16_t	 prefork_gotwebd;
369 	int		 gotwebd_reload;
370 
371 	int		 server_cnt;
372 
373 	char		 httpd_chroot[PATH_MAX];
374 
375 	int		 unix_socket;
376 	char		 unix_socket_name[PATH_MAX];
377 };
378 
379 /*
380  * URL parameter for gotweb_render_url.  NULL values and int set to -1
381  * are implicitly ignored, and string are properly escaped.
382  */
383 struct gotweb_url {
384 	int		 action;
385 	int		 index_page;
386 	const char	*commit;
387 	const char	*previd;
388 	const char	*prevset;
389 	const char	*file;
390 	const char	*folder;
391 	const char	*headref;
392 	const char	*path;
393 };
394 
395 struct querystring {
396 	uint8_t		 action;
397 	char		*commit;
398 	char		*previd;
399 	char		*prevset;
400 	char		*file;
401 	char		*folder;
402 	char		*headref;
403 	int		 index_page;
404 	char		*path;
405 };
406 
407 struct querystring_keys {
408 	const char	*name;
409 	int		 element;
410 };
411 
412 struct action_keys {
413 	const char	*name;
414 	int		 action;
415 };
416 
417 enum querystring_elements {
418 	ACTION,
419 	COMMIT,
420 	RFILE,
421 	FOLDER,
422 	HEADREF,
423 	INDEX_PAGE,
424 	PATH,
425 };
426 
427 enum query_actions {
428 	BLAME,
429 	BLOB,
430 	BLOBRAW,
431 	BRIEFS,
432 	COMMITS,
433 	DIFF,
434 	ERR,
435 	INDEX,
436 	PATCH,
437 	SUMMARY,
438 	TAG,
439 	TAGS,
440 	TREE,
441 	RSS,
442 };
443 
444 extern struct gotwebd	*gotwebd_env;
445 
446 typedef int (*got_render_blame_line_cb)(struct template *, const char *,
447     struct blame_line *, int, int);
448 
449 /* gotwebd.c */
450 void	 imsg_event_add(struct imsgev *);
451 int	 imsg_compose_event(struct imsgev *, uint16_t, uint32_t,
452 	    pid_t, int, const void *, uint16_t);
453 int	 main_compose_sockets(struct gotwebd *, uint32_t, int,
454 	    const void *, uint16_t);
455 int	 sockets_compose_main(struct gotwebd *, uint32_t,
456 	    const void *, uint16_t);
457 
458 /* sockets.c */
459 void sockets(struct gotwebd *, int);
460 void sockets_parse_sockets(struct gotwebd *);
461 void sockets_socket_accept(int, short, void *);
462 int sockets_privinit(struct gotwebd *, struct socket *);
463 
464 /* gotweb.c */
465 void gotweb_index_navs(struct request *, struct gotweb_url *, int *,
466     struct gotweb_url *, int *);
467 int gotweb_render_age(struct template *, time_t);
468 const struct got_error *gotweb_init_transport(struct transport **);
469 const char *gotweb_action_name(int);
470 int gotweb_render_url(struct request *, struct gotweb_url *);
471 int gotweb_render_absolute_url(struct request *, struct gotweb_url *);
472 void gotweb_free_repo_commit(struct repo_commit *);
473 void gotweb_free_repo_tag(struct repo_tag *);
474 void gotweb_process_request(struct request *);
475 void gotweb_free_transport(struct transport *);
476 
477 /* pages.tmpl */
478 int	gotweb_render_page(struct template *, int (*)(struct template *));
479 int	gotweb_render_error(struct template *);
480 int	gotweb_render_repo_table_hdr(struct template *);
481 int	gotweb_render_repo_fragment(struct template *, struct repo_dir *);
482 int	gotweb_render_briefs(struct template *);
483 int	gotweb_render_navs(struct template *);
484 int	gotweb_render_commits(struct template *);
485 int	gotweb_render_blob(struct template *);
486 int	gotweb_render_tree(struct template *);
487 int	gotweb_render_tags(struct template *);
488 int	gotweb_render_tag(struct template *);
489 int	gotweb_render_diff(struct template *);
490 int	gotweb_render_branches(struct template *, struct got_reflist_head *);
491 int	gotweb_render_summary(struct template *);
492 int	gotweb_render_blame(struct template *);
493 int	gotweb_render_patch(struct template *);
494 int	gotweb_render_rss(struct template *);
495 
496 /* parse.y */
497 int parse_config(const char *, struct gotwebd *);
498 int cmdline_symset(char *);
499 
500 /* fcgi.c */
501 void fcgi_request(int, short, void *);
502 void fcgi_timeout(int, short, void *);
503 void fcgi_cleanup_request(struct request *);
504 void fcgi_create_end_record(struct request *);
505 void dump_fcgi_record(const char *, struct fcgi_record_header *);
506 int fcgi_write(void *, const void *, size_t);
507 
508 /* got_operations.c */
509 const struct got_error *got_gotweb_closefile(FILE *);
510 const struct got_error *got_get_repo_owner(char **, struct request *);
511 const struct got_error *got_get_repo_age(time_t *, struct request *,
512     const char *);
513 const struct got_error *got_get_repo_commits(struct request *, size_t);
514 const struct got_error *got_get_repo_tags(struct request *, size_t);
515 const struct got_error *got_get_repo_heads(struct request *);
516 const struct got_error *got_open_diff_for_output(FILE **, struct request *);
517 int got_output_repo_tree(struct request *, char **,
518     int (*)(struct template *, struct got_tree_entry *));
519 const struct got_error *got_open_blob_for_output(struct got_blob_object **,
520     int *, int *, struct request *, const char *, const char *, const char *);
521 int got_output_blob_by_lines(struct template *, struct got_blob_object *,
522     int (*)(struct template *, const char *, size_t));
523 const struct got_error *got_output_file_blame(struct request *,
524     got_render_blame_line_cb);
525 
526 /* config.c */
527 int config_setserver(struct gotwebd *, struct server *);
528 int config_getserver(struct gotwebd *, struct imsg *);
529 int config_setsock(struct gotwebd *, struct socket *);
530 int config_getsock(struct gotwebd *, struct imsg *);
531 int config_setfd(struct gotwebd *, struct socket *);
532 int config_getfd(struct gotwebd *, struct imsg *);
533 int config_getcfg(struct gotwebd *, struct imsg *);
534 int config_init(struct gotwebd *);
535 
536 /* log.c */
537 void	log_init(int, int);
538 void	log_procinit(const char *);
539 void	log_setverbose(int);
540 int	log_getverbose(void);
541 void	log_warn(const char *, ...)
542 	    __attribute__((__format__ (printf, 1, 2)));
543 void	log_warnx(const char *, ...)
544 	    __attribute__((__format__ (printf, 1, 2)));
545 void	log_info(const char *, ...)
546 	    __attribute__((__format__ (printf, 1, 2)));
547 void	log_debug(const char *, ...)
548 	    __attribute__((__format__ (printf, 1, 2)));
549 void	logit(int, const char *, ...)
550 	    __attribute__((__format__ (printf, 2, 3)));
551 void	vlog(int, const char *, va_list)
552 	    __attribute__((__format__ (printf, 2, 0)));
553 __dead void fatal(const char *, ...)
554 	    __attribute__((__format__ (printf, 1, 2)));
555 __dead void fatalx(const char *, ...)
556 	    __attribute__((__format__ (printf, 1, 2)));