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_SCRIPT_NAME		 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
117 
118 enum imsg_type {
119 	IMSG_CFG_SRV = IMSG_PROC_MAX,
120 	IMSG_CFG_SOCK,
121 	IMSG_CFG_FD,
122 	IMSG_CFG_DONE,
123 	IMSG_CTL_START,
124 };
125 
126 struct env_val {
127 	SLIST_ENTRY(env_val)	 entry;
128 	char			*val;
129 };
130 SLIST_HEAD(env_head, env_val);
131 
132 struct fcgi_record_header {
133 	uint8_t		version;
134 	uint8_t		type;
135 	uint16_t	id;
136 	uint16_t	content_len;
137 	uint8_t		padding_len;
138 	uint8_t		reserved;
139 }__attribute__((__packed__));
140 
141 struct repo_dir {
142 	char			*name;
143 	char			*owner;
144 	char			*description;
145 	char			*url;
146 	char			*age;
147 	char			*path;
148 };
149 
150 struct repo_tag {
151 	TAILQ_ENTRY(repo_tag)	 entry;
152 	char			*commit_id;
153 	char			*tag_name;
154 	char			*tag_commit;
155 	char			*commit_msg;
156 	char			*tagger;
157 	time_t			 tagger_time;
158 };
159 
160 struct repo_commit {
161 	TAILQ_ENTRY(repo_commit)	 entry;
162 	char			*path;
163 	char			*refs_str;
164 	char			*commit_id; /* id_str1 */
165 	char			*parent_id; /* id_str2 */
166 	char			*tree_id;
167 	char			*author;
168 	char			*committer;
169 	char			*commit_msg;
170 	time_t			 committer_time;
171 };
172 
173 struct got_repository;
174 struct transport {
175 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
176 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
177 	struct got_repository	*repo;
178 	struct repo_dir		*repo_dir;
179 	struct querystring	*qs;
180 	char			*next_id;
181 	char			*prev_id;
182 	unsigned int		 repos_total;
183 	unsigned int		 next_disp;
184 	unsigned int		 prev_disp;
185 	unsigned int		 tag_count;
186 };
187 
188 enum socket_priv_fds {
189 	DIFF_FD_1,
190 	DIFF_FD_2,
191 	DIFF_FD_3,
192 	DIFF_FD_4,
193 	DIFF_FD_5,
194 	BLAME_FD_1,
195 	BLAME_FD_2,
196 	BLAME_FD_3,
197 	BLAME_FD_4,
198 	BLAME_FD_5,
199 	BLAME_FD_6,
200 	BLOB_FD_1,
201 	BLOB_FD_2,
202 	PRIV_FDS__MAX,
203 };
204 
205 struct request {
206 	struct socket			*sock;
207 	struct server			*srv;
208 	struct transport		*t;
209 	struct event			 ev;
210 	struct event			 tmo;
211 
212 	uint16_t			 id;
213 	int				 fd;
214 	int				 priv_fd[PRIV_FDS__MAX];
215 
216 	uint8_t				 buf[FCGI_RECORD_SIZE];
217 	size_t				 buf_pos;
218 	size_t				 buf_len;
219 
220 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
221 	size_t				 outbuf_len;
222 
223 	char				 querystring[MAX_QUERYSTRING];
224 	char				 http_host[GOTWEBD_MAXTEXT];
225 	char				 script_name[MAX_SCRIPT_NAME];
226 	char				 server_name[MAX_SERVER_NAME];
227 
228 	uint8_t				 request_started;
229 };
230 
231 struct fcgi_begin_request_body {
232 	uint16_t	role;
233 	uint8_t		flags;
234 	uint8_t		reserved[5];
235 }__attribute__((__packed__));
236 
237 struct fcgi_end_request_body {
238 	uint32_t	app_status;
239 	uint8_t		protocol_status;
240 	uint8_t		reserved[3];
241 }__attribute__((__packed__));
242 
243 struct address {
244 	TAILQ_ENTRY(address)	 entry;
245 	struct sockaddr_storage	 ss;
246 	int			 ipproto;
247 	int			 prefixlen;
248 	in_port_t		 port;
249 	char			 ifname[IFNAMSIZ];
250 };
251 TAILQ_HEAD(addresslist, address);
252 
253 struct cached_repo {
254 	char path[PATH_MAX];
255 	struct got_repository *repo;
256 };
257 
258 struct server {
259 	TAILQ_ENTRY(server)	 entry;
260 	struct addresslist	al;
261 
262 	struct cached_repo	*cached_repos;
263 	int		 ncached_repos;
264 
265 	char		 name[GOTWEBD_MAXTEXT];
266 
267 	char		 repos_path[PATH_MAX];
268 	char		 site_name[GOTWEBD_MAXNAME];
269 	char		 site_owner[GOTWEBD_MAXNAME];
270 	char		 site_link[GOTWEBD_MAXTEXT];
271 	char		 logo[GOTWEBD_MAXTEXT];
272 	char		 logo_url[GOTWEBD_MAXTEXT];
273 	char		 custom_css[PATH_MAX];
274 
275 	size_t		 max_repos;
276 	size_t		 max_repos_display;
277 	size_t		 max_commits_display;
278 
279 	int		 show_site_owner;
280 	int		 show_repo_owner;
281 	int		 show_repo_age;
282 	int		 show_repo_description;
283 	int		 show_repo_cloneurl;
284 	int		 respect_exportok;
285 
286 	int		 unix_socket;
287 	char		 unix_socket_name[PATH_MAX];
288 
289 	int		 fcgi_socket;
290 };
291 TAILQ_HEAD(serverlist, server);
292 
293 enum client_action {
294 	CLIENT_CONNECT,
295 	CLIENT_DISCONNECT,
296 };
297 
298 struct socket_conf {
299 	struct address	 addr;
300 
301 	char		 name[GOTWEBD_MAXTEXT];
302 	char		 srv_name[GOTWEBD_MAXTEXT];
303 
304 	int		 id;
305 	int		 af_type;
306 	char		 unix_socket_name[PATH_MAX];
307 	in_port_t	 fcgi_socket_port;
308 };
309 
310 struct socket {
311 	TAILQ_ENTRY(socket)	 entry;
312 	struct socket_conf	 conf;
313 
314 	int		 fd;
315 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
316 	int		 priv_fd[PRIV_FDS__MAX];
317 
318 	struct event	 evt;
319 	struct event	 ev;
320 	struct event	 pause;
321 
322 	int		 client_status;
323 };
324 TAILQ_HEAD(socketlist, socket);
325 
326 struct gotwebd {
327 	struct serverlist	servers;
328 	struct socketlist	sockets;
329 
330 	struct privsep	*gotwebd_ps;
331 	const char	*gotwebd_conffile;
332 
333 	int		 gotwebd_debug;
334 	int		 gotwebd_verbose;
335 	int		 gotwebd_noaction;
336 
337 	uint16_t	 prefork_gotwebd;
338 	int		 gotwebd_reload;
339 
340 	int		 server_cnt;
341 
342 	char		 httpd_chroot[PATH_MAX];
343 
344 	int		 unix_socket;
345 	char		 unix_socket_name[PATH_MAX];
346 };
347 
348 /*
349  * URL parameter for gotweb_link.  NULL values and int set to -1 are
350  * implicitly ignored, and string are properly escaped.
351  */
352 struct gotweb_url {
353 	int		 action;
354 	int		 index_page;
355 	int		 page;
356 	const char	*commit;
357 	const char	*previd;
358 	const char	*prevset;
359 	const char	*file;
360 	const char	*folder;
361 	const char	*headref;
362 	const char	*path;
363 };
364 
365 struct querystring {
366 	uint8_t		 action;
367 	char		*commit;
368 	char		*previd;
369 	char		*prevset;
370 	char		*file;
371 	char		*folder;
372 	char		*headref;
373 	int		 index_page;
374 	char		*index_page_str;
375 	char		*path;
376 	int		 page;
377 	char		*page_str;
378 };
379 
380 struct querystring_keys {
381 	const char	*name;
382 	int		 element;
383 };
384 
385 struct action_keys {
386 	const char	*name;
387 	int		 action;
388 };
389 
390 enum querystring_elements {
391 	ACTION,
392 	COMMIT,
393 	RFILE,
394 	FOLDER,
395 	HEADREF,
396 	INDEX_PAGE,
397 	PATH,
398 	PAGE,
399 	PREVID,
400 	QSELEM__MAX,
401 };
402 
403 enum query_actions {
404 	BLAME,
405 	BLOB,
406 	BRIEFS,
407 	COMMITS,
408 	DIFF,
409 	ERR,
410 	INDEX,
411 	SUMMARY,
412 	TAG,
413 	TAGS,
414 	TREE,
415 	ACTIONS__MAX,
416 };
417 
418 extern struct gotwebd	*gotwebd_env;
419 
420 /* sockets.c */
421 void sockets(struct privsep *, struct privsep_proc *);
422 void sockets_shutdown(void);
423 void sockets_parse_sockets(struct gotwebd *);
424 void sockets_socket_accept(int, short, void *);
425 int sockets_privinit(struct gotwebd *, struct socket *);
426 
427 /* gotweb.c */
428 const struct got_error *gotweb_render_content_type(struct request *,
429     const uint8_t *);
430 const struct got_error
431     *gotweb_render_content_type_file(struct request *, const uint8_t *, char *);
432 const struct got_error *gotweb_get_time_str(char **, time_t, int);
433 const struct got_error *gotweb_init_transport(struct transport **);
434 const struct got_error *gotweb_escape_html(char **, const char *);
435 int gotweb_link(struct request *, struct gotweb_url *, const char *, ...)
436 	__attribute__((__format__(printf, 3, 4)))
437 	__attribute__((__nonnull__(3)));
438 void gotweb_free_repo_commit(struct repo_commit *);
439 void gotweb_free_repo_tag(struct repo_tag *);
440 void gotweb_process_request(struct request *);
441 void gotweb_free_transport(struct transport *);
442 
443 /* parse.y */
444 int parse_config(const char *, struct gotwebd *);
445 int cmdline_symset(char *);
446 
447 /* fcgi.c */
448 void fcgi_request(int, short, void *);
449 void fcgi_timeout(int, short, void *);
450 void fcgi_cleanup_request(struct request *);
451 void fcgi_create_end_record(struct request *);
452 void dump_fcgi_record(const char *, struct fcgi_record_header *);
453 int fcgi_vprintf(struct request *, const char *, va_list);
454 int fcgi_printf(struct request *, const char *, ...)
455 	__attribute__((__format__(printf, 2, 3)))
456 	__attribute__((__nonnull__(2)));
457 int fcgi_gen_binary_response(struct request *, const uint8_t *, int);
458 
459 /* got_operations.c */
460 const struct got_error *got_get_repo_owner(char **, struct request *);
461 const struct got_error *got_get_repo_age(char **, struct request *,
462     const char *, int);
463 const struct got_error *got_get_repo_commits(struct request *, int);
464 const struct got_error *got_get_repo_tags(struct request *, int);
465 const struct got_error *got_get_repo_heads(struct request *);
466 const struct got_error *got_output_repo_diff(struct request *);
467 const struct got_error *got_output_repo_tree(struct request *);
468 const struct got_error *got_output_file_blob(struct request *);
469 const struct got_error *got_output_file_blame(struct request *);
470 
471 /* config.c */
472 int config_setserver(struct gotwebd *, struct server *);
473 int config_getserver(struct gotwebd *, struct imsg *);
474 int config_setsock(struct gotwebd *, struct socket *);
475 int config_getsock(struct gotwebd *, struct imsg *);
476 int config_setfd(struct gotwebd *, struct socket *);
477 int config_getfd(struct gotwebd *, struct imsg *);
478 int config_getcfg(struct gotwebd *, struct imsg *);
479 int config_init(struct gotwebd *);