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_CACHESIZE	 1024
43 #define GOTWEBD_MAXCLIENTS	 1024
44 #define GOTWEBD_MAXTEXT		 511
45 #define GOTWEBD_MAXNAME		 64
46 #define GOTWEBD_MAXPORT		 6
47 #define GOTWEBD_NUMPROC		 3
48 #define GOTWEBD_MAXIFACE	 16
49 #define GOTWEBD_REPO_CACHESIZE	 4
50 
51 /* GOTWEB DEFAULTS */
52 #define MAX_QUERYSTRING		 2048
53 #define MAX_SCRIPT_NAME		 255
54 #define MAX_SERVER_NAME		 255
55 
56 #define GOTWEB_GIT_DIR		 ".git"
57 
58 #define D_HTTPD_CHROOT		 "/var/www"
59 #define D_UNIX_SOCKET		 "/run/gotweb.sock"
60 #define D_FCGI_PORT		 "9000"
61 #define D_GOTPATH		 "/got/public"
62 #define D_SITENAME		 "Gotweb"
63 #define D_SITEOWNER		 "Got Owner"
64 #define D_SITELINK		 "Repos"
65 #define D_GOTLOGO		 "got.png"
66 #define D_GOTURL		 "https://gameoftrees.org"
67 #define D_GOTWEBCSS		 "gotweb.css"
68 
69 #define D_SHOWROWNER		 1
70 #define D_SHOWSOWNER		 1
71 #define D_SHOWAGE		 1
72 #define D_SHOWDESC		 1
73 #define D_SHOWURL		 1
74 #define D_MAXREPO		 0
75 #define D_MAXREPODISP		 25
76 #define D_MAXSLCOMMDISP		 10
77 #define D_MAXCOMMITDISP		 25
78 
79 #define BUF			 8192
80 
81 #define TIMEOUT_DEFAULT		 120
82 
83 #define FCGI_CONTENT_SIZE	 65535
84 #define FCGI_PADDING_SIZE	 255
85 #define FCGI_RECORD_SIZE	 \
86     (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
87 
88 #define FCGI_ALIGNMENT		 8
89 #define FCGI_ALIGN(n)		 \
90     (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
91 
92 #define FD_RESERVE		 5
93 #define FD_NEEDED		 6
94 
95 #define FCGI_BEGIN_REQUEST	 1
96 #define FCGI_ABORT_REQUEST	 2
97 #define FCGI_END_REQUEST	 3
98 #define FCGI_PARAMS		 4
99 #define FCGI_STDIN		 5
100 #define FCGI_STDOUT		 6
101 #define FCGI_STDERR		 7
102 #define FCGI_DATA		 8
103 #define FCGI_GET_VALUES		 9
104 #define FCGI_GET_VALUES_RESULT	10
105 #define FCGI_UNKNOWN_TYPE	11
106 #define FCGI_MAXTYPE		(FCGI_UNKNOWN_TYPE)
107 
108 #define FCGI_REQUEST_COMPLETE	0
109 #define FCGI_CANT_MPX_CONN	1
110 #define FCGI_OVERLOADED		2
111 #define FCGI_UNKNOWN_ROLE	3
112 
113 #define GOTWEB_PACK_NUM_TEMPFILES     32
114 
115 enum imsg_type {
116 	IMSG_CFG_SRV = IMSG_PROC_MAX,
117 	IMSG_CFG_SOCK,
118 	IMSG_CFG_FD,
119 	IMSG_CFG_DONE,
120 	IMSG_CTL_START,
121 };
122 
123 struct env_val {
124 	SLIST_ENTRY(env_val)	 entry;
125 	char			*val;
126 };
127 SLIST_HEAD(env_head, env_val);
128 
129 struct fcgi_record_header {
130 	uint8_t		version;
131 	uint8_t		type;
132 	uint16_t	id;
133 	uint16_t	content_len;
134 	uint8_t		padding_len;
135 	uint8_t		reserved;
136 }__attribute__((__packed__));
137 
138 struct repo_dir {
139 	char			*name;
140 	char			*owner;
141 	char			*description;
142 	char			*url;
143 	char			*age;
144 	char			*path;
145 };
146 
147 struct repo_tag {
148 	TAILQ_ENTRY(repo_tag)	 entry;
149 	char			*commit_id;
150 	char			*tag_name;
151 	char			*tag_commit;
152 	char			*commit_msg;
153 	char			*tagger;
154 	time_t			 tagger_time;
155 };
156 
157 struct repo_commit {
158 	TAILQ_ENTRY(repo_commit)	 entry;
159 	char			*path;
160 	char			*refs_str;
161 	char			*commit_id; /* id_str1 */
162 	char			*parent_id; /* id_str2 */
163 	char			*tree_id;
164 	char			*author;
165 	char			*committer;
166 	char			*commit_msg;
167 	time_t			 committer_time;
168 };
169 
170 struct got_repository;
171 struct transport {
172 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
173 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
174 	struct got_repository	*repo;
175 	struct repo_dir		*repo_dir;
176 	struct querystring	*qs;
177 	char			*next_id;
178 	char			*prev_id;
179 	unsigned int		 repos_total;
180 	unsigned int		 next_disp;
181 	unsigned int		 prev_disp;
182 	unsigned int		 tag_count;
183 };
184 
185 enum socket_priv_fds {
186 	DIFF_FD_1,
187 	DIFF_FD_2,
188 	DIFF_FD_3,
189 	DIFF_FD_4,
190 	DIFF_FD_5,
191 	BLAME_FD_1,
192 	BLAME_FD_2,
193 	BLAME_FD_3,
194 	BLAME_FD_4,
195 	BLAME_FD_5,
196 	BLAME_FD_6,
197 	BLOB_FD_1,
198 	BLOB_FD_2,
199 	PRIV_FDS__MAX,
200 };
201 
202 struct request {
203 	struct socket			*sock;
204 	struct server			*srv;
205 	struct transport		*t;
206 	struct event			 ev;
207 	struct event			 tmo;
208 
209 	uint16_t			 id;
210 	int				 fd;
211 	int				 priv_fd[PRIV_FDS__MAX];
212 
213 	uint8_t				 buf[FCGI_RECORD_SIZE];
214 	size_t				 buf_pos;
215 	size_t				 buf_len;
216 
217 	uint8_t				 outbuf[GOTWEBD_CACHESIZE];
218 	size_t				 outbuf_len;
219 
220 	char				 querystring[MAX_QUERYSTRING];
221 	char				 http_host[GOTWEBD_MAXTEXT];
222 	char				 script_name[MAX_SCRIPT_NAME];
223 	char				 server_name[MAX_SERVER_NAME];
224 
225 	uint8_t				 request_started;
226 };
227 
228 struct fcgi_begin_request_body {
229 	uint16_t	role;
230 	uint8_t		flags;
231 	uint8_t		reserved[5];
232 }__attribute__((__packed__));
233 
234 struct fcgi_end_request_body {
235 	uint32_t	app_status;
236 	uint8_t		protocol_status;
237 	uint8_t		reserved[3];
238 }__attribute__((__packed__));
239 
240 struct address {
241 	TAILQ_ENTRY(address)	 entry;
242 	struct sockaddr_storage	 ss;
243 	int			 ipproto;
244 	int			 prefixlen;
245 	in_port_t		 port;
246 	char			 ifname[IFNAMSIZ];
247 };
248 TAILQ_HEAD(addresslist, address);
249 
250 struct cached_repo {
251 	char path[PATH_MAX];
252 	struct got_repository *repo;
253 };
254 
255 struct server {
256 	TAILQ_ENTRY(server)	 entry;
257 	struct addresslist	al;
258 
259 	struct cached_repo	*cached_repos;
260 	int		 ncached_repos;
261 
262 	char		 name[GOTWEBD_MAXTEXT];
263 
264 	char		 repos_path[PATH_MAX];
265 	char		 site_name[GOTWEBD_MAXNAME];
266 	char		 site_owner[GOTWEBD_MAXNAME];
267 	char		 site_link[GOTWEBD_MAXTEXT];
268 	char		 logo[GOTWEBD_MAXTEXT];
269 	char		 logo_url[GOTWEBD_MAXTEXT];
270 	char		 custom_css[PATH_MAX];
271 
272 	size_t		 max_repos;
273 	size_t		 max_repos_display;
274 	size_t		 max_commits_display;
275 
276 	int		 show_site_owner;
277 	int		 show_repo_owner;
278 	int		 show_repo_age;
279 	int		 show_repo_description;
280 	int		 show_repo_cloneurl;
281 
282 	int		 unix_socket;
283 	char		 unix_socket_name[PATH_MAX];
284 
285 	int		 fcgi_socket;
286 };
287 TAILQ_HEAD(serverlist, server);
288 
289 enum client_action {
290 	CLIENT_CONNECT,
291 	CLIENT_DISCONNECT,
292 };
293 
294 struct socket_conf {
295 	struct address	 addr;
296 
297 	char		 name[GOTWEBD_MAXTEXT];
298 	char		 srv_name[GOTWEBD_MAXTEXT];
299 
300 	int		 id;
301 	int		 af_type;
302 	char		 unix_socket_name[PATH_MAX];
303 	in_port_t	 fcgi_socket_port;
304 };
305 
306 struct socket {
307 	TAILQ_ENTRY(socket)	 entry;
308 	struct socket_conf	 conf;
309 
310 	int		 fd;
311 	int		 pack_fds[GOTWEB_PACK_NUM_TEMPFILES];
312 	int		 priv_fd[PRIV_FDS__MAX];
313 
314 	struct event	 evt;
315 	struct event	 ev;
316 	struct event	 pause;
317 
318 	int		 client_status;
319 };
320 TAILQ_HEAD(socketlist, socket);
321 
322 struct gotwebd {
323 	struct serverlist	servers;
324 	struct socketlist	sockets;
325 
326 	struct privsep	*gotwebd_ps;
327 	const char	*gotwebd_conffile;
328 
329 	int		 gotwebd_debug;
330 	int		 gotwebd_verbose;
331 	int		 gotwebd_noaction;
332 
333 	uint16_t	 prefork_gotwebd;
334 	int		 gotwebd_reload;
335 
336 	int		 server_cnt;
337 
338 	char		 httpd_chroot[PATH_MAX];
339 
340 	int		 unix_socket;
341 	char		 unix_socket_name[PATH_MAX];
342 };
343 
344 /*
345  * URL parameter for gotweb_link.  NULL values and int set to -1 are
346  * implicitly ignored, and string are properly escaped.
347  */
348 struct gotweb_url {
349 	int		 action;
350 	int		 index_page;
351 	int		 page;
352 	const char	*commit;
353 	const char	*previd;
354 	const char	*prevset;
355 	const char	*file;
356 	const char	*folder;
357 	const char	*headref;
358 	const char	*path;
359 };
360 
361 struct querystring {
362 	uint8_t		 action;
363 	char		*commit;
364 	char		*previd;
365 	char		*prevset;
366 	char		*file;
367 	char		*folder;
368 	char		*headref;
369 	int		 index_page;
370 	char		*index_page_str;
371 	char		*path;
372 	int		 page;
373 	char		*page_str;
374 };
375 
376 struct querystring_keys {
377 	const char	*name;
378 	int		 element;
379 };
380 
381 struct action_keys {
382 	const char	*name;
383 	int		 action;
384 };
385 
386 enum querystring_elements {
387 	ACTION,
388 	COMMIT,
389 	RFILE,
390 	FOLDER,
391 	HEADREF,
392 	INDEX_PAGE,
393 	PATH,
394 	PAGE,
395 	PREVID,
396 	QSELEM__MAX,
397 };
398 
399 enum query_actions {
400 	BLAME,
401 	BLOB,
402 	BRIEFS,
403 	COMMITS,
404 	DIFF,
405 	ERR,
406 	INDEX,
407 	SUMMARY,
408 	TAG,
409 	TAGS,
410 	TREE,
411 	ACTIONS__MAX,
412 };
413 
414 extern struct gotwebd	*gotwebd_env;
415 
416 /* sockets.c */
417 void sockets(struct privsep *, struct privsep_proc *);
418 void sockets_shutdown(void);
419 void sockets_parse_sockets(struct gotwebd *);
420 void sockets_socket_accept(int, short, void *);
421 int sockets_privinit(struct gotwebd *, struct socket *);
422 
423 /* gotweb.c */
424 const struct got_error *gotweb_render_content_type(struct request *,
425     const uint8_t *);
426 const struct got_error
427     *gotweb_render_content_type_file(struct request *, const uint8_t *, char *);
428 const struct got_error *gotweb_get_time_str(char **, time_t, int);
429 const struct got_error *gotweb_init_transport(struct transport **);
430 const struct got_error *gotweb_escape_html(char **, const char *);
431 int gotweb_link(struct request *, struct gotweb_url *, const char *, ...)
432 	__attribute__((__format__(printf, 3, 4)))
433 	__attribute__((__nonnull__(3)));
434 void gotweb_free_repo_commit(struct repo_commit *);
435 void gotweb_free_repo_tag(struct repo_tag *);
436 void gotweb_process_request(struct request *);
437 void gotweb_free_transport(struct transport *);
438 
439 /* parse.y */
440 int parse_config(const char *, struct gotwebd *);
441 int cmdline_symset(char *);
442 
443 /* fcgi.c */
444 void fcgi_request(int, short, void *);
445 void fcgi_timeout(int, short, void *);
446 void fcgi_cleanup_request(struct request *);
447 void fcgi_create_end_record(struct request *);
448 void dump_fcgi_record(const char *, struct fcgi_record_header *);
449 int fcgi_vprintf(struct request *, const char *, va_list);
450 int fcgi_printf(struct request *, const char *, ...)
451 	__attribute__((__format__(printf, 2, 3)))
452 	__attribute__((__nonnull__(2)));
453 int fcgi_gen_binary_response(struct request *, const uint8_t *, int);
454 
455 /* got_operations.c */
456 const struct got_error *got_get_repo_owner(char **, struct request *, char *);
457 const struct got_error *got_get_repo_age(char **, struct request *, char *,
458     const char *, int);
459 const struct got_error *got_get_repo_commits(struct request *, int);
460 const struct got_error *got_get_repo_tags(struct request *, int);
461 const struct got_error *got_get_repo_heads(struct request *);
462 const struct got_error *got_output_repo_diff(struct request *);
463 const struct got_error *got_output_repo_tree(struct request *);
464 const struct got_error *got_output_file_blob(struct request *);
465 const struct got_error *got_output_file_blame(struct request *);
466 
467 /* config.c */
468 int config_setserver(struct gotwebd *, struct server *);
469 int config_getserver(struct gotwebd *, struct imsg *);
470 int config_setsock(struct gotwebd *, struct socket *);
471 int config_getsock(struct gotwebd *, struct imsg *);
472 int config_setfd(struct gotwebd *, struct socket *);
473 int config_getfd(struct gotwebd *, struct imsg *);
474 int config_getcfg(struct gotwebd *, struct imsg *);
475 int config_init(struct gotwebd *);