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_MAXIFACE	 16
51 #define GOTWEBD_REPO_CACHESIZE	 4
52 
53 /* GOTWEB DEFAULTS */
54 #define MAX_QUERYSTRING		 2048
55 #define MAX_DOCUMENT_URI	 255
56 #define MAX_SERVER_NAME		 255
57 
58 #define GOTWEB_GIT_DIR		 ".git"
59 
60 #define D_HTTPD_CHROOT		 "/var/www"
61 #define D_UNIX_SOCKET		 "/run/gotweb.sock"
62 #define D_FCGI_PORT		 "9000"
63 #define D_GOTPATH		 "/got/public"
64 #define D_SITENAME		 "Gotweb"
65 #define D_SITEOWNER		 "Got Owner"
66 #define D_SITELINK		 "Repos"
67 #define D_GOTLOGO		 "got.png"
68 #define D_GOTURL		 "https://gameoftrees.org"
69 #define D_GOTWEBCSS		 "gotweb.css"
70 
71 #define D_SHOWROWNER		 1
72 #define D_SHOWSOWNER		 1
73 #define D_SHOWAGE		 1
74 #define D_SHOWDESC		 1
75 #define D_SHOWURL		 1
76 #define D_RESPECTEXPORTOK	 0
77 #define D_MAXREPO		 0
78 #define D_MAXREPODISP		 25
79 #define D_MAXSLCOMMDISP		 10
80 #define D_MAXCOMMITDISP		 25
81 
82 #define BUF			 8192
83 
84 #define TIMEOUT_DEFAULT		 120
85 
86 #define FCGI_CONTENT_SIZE	 65535
87 #define FCGI_PADDING_SIZE	 255
88 #define FCGI_RECORD_SIZE	 \
89     (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
90 
91 #define FCGI_ALIGNMENT		 8
92 #define FCGI_ALIGN(n)		 \
93     (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
94 
95 #define FD_RESERVE		 5
96 #define FD_NEEDED		 6
97 
98 #define FCGI_BEGIN_REQUEST	 1
99 #define FCGI_ABORT_REQUEST	 2
100 #define FCGI_END_REQUEST	 3
101 #define FCGI_PARAMS		 4
102 #define FCGI_STDIN		 5
103 #define FCGI_STDOUT		 6
104 #define FCGI_STDERR		 7
105 #define FCGI_DATA		 8
106 #define FCGI_GET_VALUES		 9
107 #define FCGI_GET_VALUES_RESULT	10
108 #define FCGI_UNKNOWN_TYPE	11
109 #define FCGI_MAXTYPE		(FCGI_UNKNOWN_TYPE)
110 
111 #define FCGI_REQUEST_COMPLETE	0
112 #define FCGI_CANT_MPX_CONN	1
113 #define FCGI_OVERLOADED		2
114 #define FCGI_UNKNOWN_ROLE	3
115 
116 #define GOTWEB_PACK_NUM_TEMPFILES     (32 * 2)
117 
118 /* Forward declaration */
119 struct got_blob_object;
120 struct got_tree_entry;
121 struct got_reflist_head;
122 
123 enum imsg_type {
124 	IMSG_CFG_SRV = IMSG_PROC_MAX,
125 	IMSG_CFG_SOCK,
126 	IMSG_CFG_FD,
127 	IMSG_CFG_DONE,
128 	IMSG_CTL_START,
129 };
130 
131 struct env_val {
132 	SLIST_ENTRY(env_val)	 entry;
133 	char			*val;
134 };
135 SLIST_HEAD(env_head, env_val);
136 
137 struct fcgi_record_header {
138 	uint8_t		version;
139 	uint8_t		type;
140 	uint16_t	id;
141 	uint16_t	content_len;
142 	uint8_t		padding_len;
143 	uint8_t		reserved;
144 }__attribute__((__packed__));
145 
146 struct blame_line {
147 	int		 annotated;
148 	char		*id_str;
149 	char		*committer;
150 	char		 datebuf[11]; /* YYYY-MM-DD + NUL */
151 };
152 
153 struct repo_dir {
154 	char			*name;
155 	char			*owner;
156 	char			*description;
157 	char			*url;
158 	time_t			 age;
159 	char			*path;
160 };
161 
162 struct repo_tag {
163 	TAILQ_ENTRY(repo_tag)	 entry;
164 	char			*commit_id;
165 	char			*tag_name;
166 	char			*tag_commit;
167 	char			*commit_msg;
168 	char			*tagger;
169 	time_t			 tagger_time;
170 };
171 
172 struct repo_commit {
173 	TAILQ_ENTRY(repo_commit)	 entry;
174 	char			*path;
175 	char			*refs_str;
176 	char			*commit_id; /* id_str1 */
177 	char			*parent_id; /* id_str2 */
178 	char			*tree_id;
179 	char			*author;
180 	char			*committer;
181 	char			*commit_msg;
182 	time_t			 committer_time;
183 };
184 
185 struct got_repository;
186 struct transport {
187 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
188 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
189 	struct got_reflist_head	 refs;
190 	struct got_repository	*repo;
191 	struct repo_dir		*repo_dir;
192 	struct querystring	*qs;
193 	char			*more_id;
194 	char			*next_id;
195 	char			*prev_id;
196 	unsigned int		 repos_total;
197 	unsigned int		 next_disp;
198 	unsigned int		 prev_disp;
199 	unsigned int		 tag_count;
200 	const struct got_error	*error;
201 	struct got_blob_object	*blob;
202 	int			 fd;
203 	FILE			*fp;
204 	struct dirent		**repos;
205 	int			 nrepos;
206 };
207 
208 enum socket_priv_fds {
209 	DIFF_FD_1,
210 	DIFF_FD_2,
211 	DIFF_FD_3,
212 	DIFF_FD_4,
213 	DIFF_FD_5,
214 	BLAME_FD_1,
215 	BLAME_FD_2,
216 	BLAME_FD_3,
217 	BLAME_FD_4,
218 	BLAME_FD_5,
219 	BLAME_FD_6,
220 	BLOB_FD_1,
221 	BLOB_FD_2,
222 	PRIV_FDS__MAX,
223 };
224 
225 struct template;
226 struct request {
227 	struct socket			*sock;
228 	struct server			*srv;
229 	struct transport		*t;
230 	struct template			*tp;
231 	struct event			 ev;
232 	struct event			 tmo;
233 
234 	uint16_t			 id;
235 	int				 fd;
236 	int				 priv_fd[PRIV_FDS__MAX];
237 
238 	uint8_t				 buf[FCGI_RECORD_SIZE];
239 	size_t				 buf_pos;
240 	size_t				 buf_len;
241 
242 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
243 	size_t				 outbuf_len;
244 
245 	char				 querystring[MAX_QUERYSTRING];
246 	char				 http_host[GOTWEBD_MAXTEXT];
247 	char				 document_uri[MAX_DOCUMENT_URI];
248 	char				 server_name[MAX_SERVER_NAME];
249 	int				 https;
250 
251 	uint8_t				 request_started;
252 };
253 
254 struct fcgi_begin_request_body {
255 	uint16_t	role;
256 	uint8_t		flags;
257 	uint8_t		reserved[5];
258 }__attribute__((__packed__));
259 
260 struct fcgi_end_request_body {
261 	uint32_t	app_status;
262 	uint8_t		protocol_status;
263 	uint8_t		reserved[3];
264 }__attribute__((__packed__));
265 
266 struct address {
267 	TAILQ_ENTRY(address)	 entry;
268 	struct sockaddr_storage	 ss;
269 	int			 ipproto;
270 	int			 prefixlen;
271 	in_port_t		 port;
272 	char			 ifname[IFNAMSIZ];
273 };
274 TAILQ_HEAD(addresslist, address);
275 
276 struct cached_repo {
277 	char path[PATH_MAX];
278 	struct got_repository *repo;
279 };
280 
281 struct server {
282 	TAILQ_ENTRY(server)	 entry;
283 	struct addresslist	al;
284 
285 	struct cached_repo	*cached_repos;
286 	int		 ncached_repos;
287 
288 	char		 name[GOTWEBD_MAXTEXT];
289 
290 	char		 repos_path[PATH_MAX];
291 	char		 site_name[GOTWEBD_MAXNAME];
292 	char		 site_owner[GOTWEBD_MAXNAME];
293 	char		 site_link[GOTWEBD_MAXTEXT];
294 	char		 logo[GOTWEBD_MAXTEXT];
295 	char		 logo_url[GOTWEBD_MAXTEXT];
296 	char		 custom_css[PATH_MAX];
297 
298 	size_t		 max_repos;
299 	size_t		 max_repos_display;
300 	size_t		 max_commits_display;
301 
302 	int		 show_site_owner;
303 	int		 show_repo_owner;
304 	int		 show_repo_age;
305 	int		 show_repo_description;
306 	int		 show_repo_cloneurl;
307 	int		 respect_exportok;
308 
309 	int		 unix_socket;
310 	char		 unix_socket_name[PATH_MAX];
311 
312 	int		 fcgi_socket;
313 };
314 TAILQ_HEAD(serverlist, server);
315 
316 enum client_action {
317 	CLIENT_CONNECT,
318 	CLIENT_DISCONNECT,
319 };
320 
321 struct socket_conf {
322 	struct address	 addr;
323 
324 	char		 name[GOTWEBD_MAXTEXT];
325 	char		 srv_name[GOTWEBD_MAXTEXT];
326 
327 	int		 id;
328 	int		 af_type;
329 	char		 unix_socket_name[PATH_MAX];
330 	in_port_t	 fcgi_socket_port;
331 };
332 
333 struct socket {
334 	TAILQ_ENTRY(socket)	 entry;
335 	struct socket_conf	 conf;
336 
337 	int		 fd;
338 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
339 	int		 priv_fd[PRIV_FDS__MAX];
340 
341 	struct event	 evt;
342 	struct event	 ev;
343 	struct event	 pause;
344 
345 	int		 client_status;
346 };
347 TAILQ_HEAD(socketlist, socket);
348 
349 struct gotwebd {
350 	struct serverlist	servers;
351 	struct socketlist	sockets;
352 
353 	struct privsep	*gotwebd_ps;
354 	const char	*gotwebd_conffile;
355 
356 	int		 gotwebd_debug;
357 	int		 gotwebd_verbose;
358 	int		 gotwebd_noaction;
359 
360 	uint16_t	 prefork_gotwebd;
361 	int		 gotwebd_reload;
362 
363 	int		 server_cnt;
364 
365 	char		 httpd_chroot[PATH_MAX];
366 
367 	int		 unix_socket;
368 	char		 unix_socket_name[PATH_MAX];
369 };
370 
371 /*
372  * URL parameter for gotweb_render_url.  NULL values and int set to -1
373  * are implicitly ignored, and string are properly escaped.
374  */
375 struct gotweb_url {
376 	int		 action;
377 	int		 index_page;
378 	int		 page;
379 	const char	*commit;
380 	const char	*previd;
381 	const char	*prevset;
382 	const char	*file;
383 	const char	*folder;
384 	const char	*headref;
385 	const char	*path;
386 };
387 
388 struct querystring {
389 	uint8_t		 action;
390 	char		*commit;
391 	char		*previd;
392 	char		*prevset;
393 	char		*file;
394 	char		*folder;
395 	char		*headref;
396 	int		 index_page;
397 	char		*path;
398 	int		 page;
399 };
400 
401 struct querystring_keys {
402 	const char	*name;
403 	int		 element;
404 };
405 
406 struct action_keys {
407 	const char	*name;
408 	int		 action;
409 };
410 
411 enum querystring_elements {
412 	ACTION,
413 	COMMIT,
414 	RFILE,
415 	FOLDER,
416 	HEADREF,
417 	INDEX_PAGE,
418 	PATH,
419 	PAGE,
420 	PREVID,
421 	QSELEM__MAX,
422 };
423 
424 enum query_actions {
425 	BLAME,
426 	BLOB,
427 	BLOBRAW,
428 	BRIEFS,
429 	COMMITS,
430 	DIFF,
431 	ERR,
432 	INDEX,
433 	SUMMARY,
434 	TAG,
435 	TAGS,
436 	TREE,
437 	RSS,
438 	ACTIONS__MAX,
439 };
440 
441 enum gotweb_ref_tm {
442 	TM_DIFF,
443 	TM_LONG,
444 	TM_RFC822,
445 };
446 
447 extern struct gotwebd	*gotwebd_env;
448 
449 typedef int (*got_render_blame_line_cb)(struct template *, const char *,
450     struct blame_line *, int, int);
451 
452 /* sockets.c */
453 void sockets(struct privsep *, struct privsep_proc *);
454 void sockets_shutdown(void);
455 void sockets_parse_sockets(struct gotwebd *);
456 void sockets_socket_accept(int, short, void *);
457 int sockets_privinit(struct gotwebd *, struct socket *);
458 
459 /* gotweb.c */
460 void gotweb_get_navs(struct request *, struct gotweb_url *, int *,
461     struct gotweb_url *, int *);
462 int gotweb_render_age(struct template *, time_t, int);
463 const struct got_error *gotweb_init_transport(struct transport **);
464 const char *gotweb_action_name(int);
465 int gotweb_render_url(struct request *, struct gotweb_url *);
466 int gotweb_render_absolute_url(struct request *, struct gotweb_url *);
467 void gotweb_free_repo_commit(struct repo_commit *);
468 void gotweb_free_repo_tag(struct repo_tag *);
469 void gotweb_process_request(struct request *);
470 void gotweb_free_transport(struct transport *);
471 
472 /* pages.tmpl */
473 int	gotweb_render_page(struct template *, int (*)(struct template *));
474 int	gotweb_render_error(struct template *);
475 int	gotweb_render_repo_table_hdr(struct template *);
476 int	gotweb_render_repo_fragment(struct template *, struct repo_dir *);
477 int	gotweb_render_briefs(struct template *);
478 int	gotweb_render_navs(struct template *);
479 int	gotweb_render_commits(struct template *);
480 int	gotweb_render_blob(struct template *);
481 int	gotweb_render_tree(struct template *);
482 int	gotweb_render_tags(struct template *);
483 int	gotweb_render_tag(struct template *);
484 int	gotweb_render_diff(struct template *);
485 int	gotweb_render_branches(struct template *, struct got_reflist_head *);
486 int	gotweb_render_summary(struct template *);
487 int	gotweb_render_blame(struct template *);
488 int	gotweb_render_rss(struct template *);
489 
490 /* parse.y */
491 int parse_config(const char *, struct gotwebd *);
492 int cmdline_symset(char *);
493 
494 /* fcgi.c */
495 void fcgi_request(int, short, void *);
496 void fcgi_timeout(int, short, void *);
497 void fcgi_cleanup_request(struct request *);
498 void fcgi_create_end_record(struct request *);
499 void dump_fcgi_record(const char *, struct fcgi_record_header *);
500 int fcgi_puts(struct template *, const char *);
501 int fcgi_putc(struct template *, int);
502 int fcgi_vprintf(struct request *, const char *, va_list);
503 int fcgi_printf(struct request *, const char *, ...)
504 	__attribute__((__format__(printf, 2, 3)))
505 	__attribute__((__nonnull__(2)));
506 int fcgi_gen_binary_response(struct request *, const uint8_t *, int);
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 *, int);
514 const struct got_error *got_get_repo_tags(struct request *, int);
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 *,
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 *);
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 *);