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_REPO_CACHESIZE	 4
51 
52 /* GOTWEB DEFAULTS */
53 #define MAX_QUERYSTRING		 2048
54 #define MAX_DOCUMENT_URI	 255
55 #define MAX_SERVER_NAME		 255
56 
57 #define GOTWEB_GIT_DIR		 ".git"
58 
59 #define D_HTTPD_CHROOT		 "/var/www"
60 #define D_UNIX_SOCKET		 "/run/gotweb.sock"
61 #define D_FCGI_PORT		 "9000"
62 #define D_GOTPATH		 "/got/public"
63 #define D_SITENAME		 "Gotweb"
64 #define D_SITEOWNER		 "Got Owner"
65 #define D_SITELINK		 "Repos"
66 #define D_GOTLOGO		 "got.png"
67 #define D_GOTURL		 "https://gameoftrees.org"
68 #define D_GOTWEBCSS		 "gotweb.css"
69 
70 #define D_SHOWROWNER		 1
71 #define D_SHOWSOWNER		 1
72 #define D_SHOWAGE		 1
73 #define D_SHOWDESC		 1
74 #define D_SHOWURL		 1
75 #define D_RESPECTEXPORTOK	 0
76 #define D_MAXREPO		 0
77 #define D_MAXREPODISP		 25
78 #define D_MAXSLCOMMDISP		 10
79 #define D_MAXCOMMITDISP		 25
80 
81 #define BUF			 8192
82 
83 #define TIMEOUT_DEFAULT		 120
84 
85 #define FCGI_CONTENT_SIZE	 65535
86 #define FCGI_PADDING_SIZE	 255
87 #define FCGI_RECORD_SIZE	 \
88     (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
89 
90 #define FCGI_ALIGNMENT		 8
91 #define FCGI_ALIGN(n)		 \
92     (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
93 
94 #define FD_RESERVE		 5
95 #define FD_NEEDED		 6
96 
97 #define FCGI_BEGIN_REQUEST	 1
98 #define FCGI_ABORT_REQUEST	 2
99 #define FCGI_END_REQUEST	 3
100 #define FCGI_PARAMS		 4
101 #define FCGI_STDIN		 5
102 #define FCGI_STDOUT		 6
103 #define FCGI_STDERR		 7
104 #define FCGI_DATA		 8
105 #define FCGI_GET_VALUES		 9
106 #define FCGI_GET_VALUES_RESULT	10
107 #define FCGI_UNKNOWN_TYPE	11
108 #define FCGI_MAXTYPE		(FCGI_UNKNOWN_TYPE)
109 
110 #define FCGI_REQUEST_COMPLETE	0
111 #define FCGI_CANT_MPX_CONN	1
112 #define FCGI_OVERLOADED		2
113 #define FCGI_UNKNOWN_ROLE	3
114 
115 #define GOTWEB_PACK_NUM_TEMPFILES     (32 * 2)
116 
117 /* Forward declaration */
118 struct got_blob_object;
119 struct got_tree_entry;
120 struct got_reflist_head;
121 
122 enum imsg_type {
123 	IMSG_CFG_SRV = IMSG_PROC_MAX,
124 	IMSG_CFG_SOCK,
125 	IMSG_CFG_FD,
126 	IMSG_CFG_DONE,
127 	IMSG_CTL_START,
128 };
129 
130 struct env_val {
131 	SLIST_ENTRY(env_val)	 entry;
132 	char			*val;
133 };
134 SLIST_HEAD(env_head, env_val);
135 
136 struct fcgi_record_header {
137 	uint8_t		version;
138 	uint8_t		type;
139 	uint16_t	id;
140 	uint16_t	content_len;
141 	uint8_t		padding_len;
142 	uint8_t		reserved;
143 }__attribute__((__packed__));
144 
145 struct blame_line {
146 	int		 annotated;
147 	char		*id_str;
148 	char		*committer;
149 	char		 datebuf[11]; /* YYYY-MM-DD + NUL */
150 };
151 
152 struct repo_dir {
153 	char			*name;
154 	char			*owner;
155 	char			*description;
156 	char			*url;
157 	time_t			 age;
158 	char			*path;
159 };
160 
161 struct repo_tag {
162 	TAILQ_ENTRY(repo_tag)	 entry;
163 	char			*commit_id;
164 	char			*tag_name;
165 	char			*tag_commit;
166 	char			*commit_msg;
167 	char			*tagger;
168 	time_t			 tagger_time;
169 };
170 
171 struct repo_commit {
172 	TAILQ_ENTRY(repo_commit)	 entry;
173 	char			*path;
174 	char			*refs_str;
175 	char			*commit_id; /* id_str1 */
176 	char			*parent_id; /* id_str2 */
177 	char			*tree_id;
178 	char			*author;
179 	char			*committer;
180 	char			*commit_msg;
181 	time_t			 committer_time;
182 };
183 
184 struct got_repository;
185 struct transport {
186 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
187 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
188 	struct got_reflist_head	 refs;
189 	struct got_repository	*repo;
190 	struct repo_dir		*repo_dir;
191 	struct querystring	*qs;
192 	char			*more_id;
193 	char			*next_id;
194 	char			*prev_id;
195 	unsigned int		 repos_total;
196 	unsigned int		 next_disp;
197 	unsigned int		 prev_disp;
198 	unsigned int		 tag_count;
199 	const struct got_error	*error;
200 	struct got_blob_object	*blob;
201 	int			 fd;
202 	FILE			*fp;
203 	struct dirent		**repos;
204 	int			 nrepos;
205 };
206 
207 enum socket_priv_fds {
208 	DIFF_FD_1,
209 	DIFF_FD_2,
210 	DIFF_FD_3,
211 	DIFF_FD_4,
212 	DIFF_FD_5,
213 	BLAME_FD_1,
214 	BLAME_FD_2,
215 	BLAME_FD_3,
216 	BLAME_FD_4,
217 	BLAME_FD_5,
218 	BLAME_FD_6,
219 	BLOB_FD_1,
220 	BLOB_FD_2,
221 	PRIV_FDS__MAX,
222 };
223 
224 struct template;
225 struct request {
226 	struct socket			*sock;
227 	struct server			*srv;
228 	struct transport		*t;
229 	struct template			*tp;
230 	struct event			 ev;
231 	struct event			 tmo;
232 
233 	uint16_t			 id;
234 	int				 fd;
235 	int				 priv_fd[PRIV_FDS__MAX];
236 
237 	uint8_t				 buf[FCGI_RECORD_SIZE];
238 	size_t				 buf_pos;
239 	size_t				 buf_len;
240 
241 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
242 
243 	char				 querystring[MAX_QUERYSTRING];
244 	char				 document_uri[MAX_DOCUMENT_URI];
245 	char				 server_name[MAX_SERVER_NAME];
246 	int				 https;
247 
248 	uint8_t				 request_started;
249 };
250 
251 struct fcgi_begin_request_body {
252 	uint16_t	role;
253 	uint8_t		flags;
254 	uint8_t		reserved[5];
255 }__attribute__((__packed__));
256 
257 struct fcgi_end_request_body {
258 	uint32_t	app_status;
259 	uint8_t		protocol_status;
260 	uint8_t		reserved[3];
261 }__attribute__((__packed__));
262 
263 struct address {
264 	TAILQ_ENTRY(address)	 entry;
265 	struct sockaddr_storage	 ss;
266 	int			 ipproto;
267 	in_port_t		 port;
268 	char			 ifname[IFNAMSIZ];
269 };
270 TAILQ_HEAD(addresslist, address);
271 
272 struct cached_repo {
273 	char path[PATH_MAX];
274 	struct got_repository *repo;
275 };
276 
277 struct server {
278 	TAILQ_ENTRY(server)	 entry;
279 	struct addresslist	al;
280 
281 	struct cached_repo	*cached_repos;
282 	int		 ncached_repos;
283 
284 	char		 name[GOTWEBD_MAXTEXT];
285 
286 	char		 repos_path[PATH_MAX];
287 	char		 site_name[GOTWEBD_MAXNAME];
288 	char		 site_owner[GOTWEBD_MAXNAME];
289 	char		 site_link[GOTWEBD_MAXTEXT];
290 	char		 logo[GOTWEBD_MAXTEXT];
291 	char		 logo_url[GOTWEBD_MAXTEXT];
292 	char		 custom_css[PATH_MAX];
293 
294 	size_t		 max_repos;
295 	size_t		 max_repos_display;
296 	size_t		 max_commits_display;
297 
298 	int		 show_site_owner;
299 	int		 show_repo_owner;
300 	int		 show_repo_age;
301 	int		 show_repo_description;
302 	int		 show_repo_cloneurl;
303 	int		 respect_exportok;
304 
305 	int		 unix_socket;
306 	char		 unix_socket_name[PATH_MAX];
307 
308 	int		 fcgi_socket;
309 };
310 TAILQ_HEAD(serverlist, server);
311 
312 enum client_action {
313 	CLIENT_CONNECT,
314 	CLIENT_DISCONNECT,
315 };
316 
317 struct socket_conf {
318 	struct address	 addr;
319 
320 	char		 name[GOTWEBD_MAXTEXT];
321 	char		 srv_name[GOTWEBD_MAXTEXT];
322 
323 	int		 id;
324 	int		 af_type;
325 	char		 unix_socket_name[PATH_MAX];
326 	in_port_t	 fcgi_socket_port;
327 };
328 
329 struct socket {
330 	TAILQ_ENTRY(socket)	 entry;
331 	struct socket_conf	 conf;
332 
333 	int		 fd;
334 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
335 	int		 priv_fd[PRIV_FDS__MAX];
336 
337 	struct event	 evt;
338 	struct event	 ev;
339 	struct event	 pause;
340 
341 	int		 client_status;
342 };
343 TAILQ_HEAD(socketlist, socket);
344 
345 struct gotwebd {
346 	struct serverlist	servers;
347 	struct socketlist	sockets;
348 
349 	struct privsep	*gotwebd_ps;
350 	const char	*gotwebd_conffile;
351 
352 	int		 gotwebd_debug;
353 	int		 gotwebd_verbose;
354 	int		 gotwebd_noaction;
355 
356 	uint16_t	 prefork_gotwebd;
357 	int		 gotwebd_reload;
358 
359 	int		 server_cnt;
360 
361 	char		 httpd_chroot[PATH_MAX];
362 
363 	int		 unix_socket;
364 	char		 unix_socket_name[PATH_MAX];
365 };
366 
367 /*
368  * URL parameter for gotweb_render_url.  NULL values and int set to -1
369  * are implicitly ignored, and string are properly escaped.
370  */
371 struct gotweb_url {
372 	int		 action;
373 	int		 index_page;
374 	int		 page;
375 	const char	*commit;
376 	const char	*previd;
377 	const char	*prevset;
378 	const char	*file;
379 	const char	*folder;
380 	const char	*headref;
381 	const char	*path;
382 };
383 
384 struct querystring {
385 	uint8_t		 action;
386 	char		*commit;
387 	char		*previd;
388 	char		*prevset;
389 	char		*file;
390 	char		*folder;
391 	char		*headref;
392 	int		 index_page;
393 	char		*path;
394 	int		 page;
395 };
396 
397 struct querystring_keys {
398 	const char	*name;
399 	int		 element;
400 };
401 
402 struct action_keys {
403 	const char	*name;
404 	int		 action;
405 };
406 
407 enum querystring_elements {
408 	ACTION,
409 	COMMIT,
410 	RFILE,
411 	FOLDER,
412 	HEADREF,
413 	INDEX_PAGE,
414 	PATH,
415 	PAGE,
416 	PREVID,
417 	QSELEM__MAX,
418 };
419 
420 enum query_actions {
421 	BLAME,
422 	BLOB,
423 	BLOBRAW,
424 	BRIEFS,
425 	COMMITS,
426 	DIFF,
427 	ERR,
428 	INDEX,
429 	SUMMARY,
430 	TAG,
431 	TAGS,
432 	TREE,
433 	RSS,
434 	ACTIONS__MAX,
435 };
436 
437 extern struct gotwebd	*gotwebd_env;
438 
439 typedef int (*got_render_blame_line_cb)(struct template *, const char *,
440     struct blame_line *, int, int);
441 
442 /* sockets.c */
443 void sockets(struct privsep *, struct privsep_proc *);
444 void sockets_shutdown(void);
445 void sockets_parse_sockets(struct gotwebd *);
446 void sockets_socket_accept(int, short, void *);
447 int sockets_privinit(struct gotwebd *, struct socket *);
448 
449 /* gotweb.c */
450 void gotweb_get_navs(struct request *, struct gotweb_url *, int *,
451     struct gotweb_url *, int *);
452 int gotweb_render_age(struct template *, time_t);
453 const struct got_error *gotweb_init_transport(struct transport **);
454 const char *gotweb_action_name(int);
455 int gotweb_render_url(struct request *, struct gotweb_url *);
456 int gotweb_render_absolute_url(struct request *, struct gotweb_url *);
457 void gotweb_free_repo_commit(struct repo_commit *);
458 void gotweb_free_repo_tag(struct repo_tag *);
459 void gotweb_process_request(struct request *);
460 void gotweb_free_transport(struct transport *);
461 
462 /* pages.tmpl */
463 int	gotweb_render_page(struct template *, int (*)(struct template *));
464 int	gotweb_render_error(struct template *);
465 int	gotweb_render_repo_table_hdr(struct template *);
466 int	gotweb_render_repo_fragment(struct template *, struct repo_dir *);
467 int	gotweb_render_briefs(struct template *);
468 int	gotweb_render_navs(struct template *);
469 int	gotweb_render_commits(struct template *);
470 int	gotweb_render_blob(struct template *);
471 int	gotweb_render_tree(struct template *);
472 int	gotweb_render_tags(struct template *);
473 int	gotweb_render_tag(struct template *);
474 int	gotweb_render_diff(struct template *);
475 int	gotweb_render_branches(struct template *, struct got_reflist_head *);
476 int	gotweb_render_summary(struct template *);
477 int	gotweb_render_blame(struct template *);
478 int	gotweb_render_rss(struct template *);
479 
480 /* parse.y */
481 int parse_config(const char *, struct gotwebd *);
482 int cmdline_symset(char *);
483 
484 /* fcgi.c */
485 void fcgi_request(int, short, void *);
486 void fcgi_timeout(int, short, void *);
487 void fcgi_cleanup_request(struct request *);
488 void fcgi_create_end_record(struct request *);
489 void dump_fcgi_record(const char *, struct fcgi_record_header *);
490 int fcgi_write(void *, const void *, size_t);
491 
492 /* got_operations.c */
493 const struct got_error *got_gotweb_closefile(FILE *);
494 const struct got_error *got_get_repo_owner(char **, struct request *);
495 const struct got_error *got_get_repo_age(time_t *, struct request *,
496     const char *);
497 const struct got_error *got_get_repo_commits(struct request *, size_t);
498 const struct got_error *got_get_repo_tags(struct request *, size_t);
499 const struct got_error *got_get_repo_heads(struct request *);
500 const struct got_error *got_open_diff_for_output(FILE **, struct request *);
501 int got_output_repo_tree(struct request *,
502     int (*)(struct template *, struct got_tree_entry *));
503 const struct got_error *got_open_blob_for_output(struct got_blob_object **,
504     int *, int *, struct request *);
505 int got_output_blob_by_lines(struct template *, struct got_blob_object *,
506     int (*)(struct template *, const char *, size_t));
507 const struct got_error *got_output_file_blame(struct request *,
508     got_render_blame_line_cb);
509 
510 /* config.c */
511 int config_setserver(struct gotwebd *, struct server *);
512 int config_getserver(struct gotwebd *, struct imsg *);
513 int config_setsock(struct gotwebd *, struct socket *);
514 int config_getsock(struct gotwebd *, struct imsg *);
515 int config_setfd(struct gotwebd *, struct socket *);
516 int config_getfd(struct gotwebd *, struct imsg *);
517 int config_getcfg(struct gotwebd *, struct imsg *);
518 int config_init(struct gotwebd *);