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_MAXCLIENTS	 1024
43 #define GOTWEBD_MAXTEXT		 511
44 #define GOTWEBD_MAXNAME		 64
45 #define GOTWEBD_MAXPORT		 6
46 #define GOTWEBD_NUMPROC		 3
47 #define GOTWEBD_MAXIFACE	 16
48 
49 /* GOTWEB DEFAULTS */
50 #define MAX_QUERYSTRING		 2048
51 #define MAX_DOCUMENT_ROOT	 255
52 #define MAX_SERVER_NAME		 255
53 
54 #define GOTWEB_GOT_DIR		 ".got"
55 #define GOTWEB_GIT_DIR		 ".git"
56 
57 #define D_HTTPD_CHROOT		 "/var/www"
58 #define D_UNIX_SOCKET		 "/run/gotweb.sock"
59 #define D_FCGI_PORT		 "9000"
60 #define D_GOTPATH		 "/got/public"
61 #define D_SITENAME		 "Gotweb"
62 #define D_SITEOWNER		 "Got Owner"
63 #define D_SITELINK		 "Repos"
64 #define D_GOTLOGO		 "got.png"
65 #define D_GOTURL		 "https://gameoftrees.org"
66 #define D_GOTWEBCSS		 "gotweb.css"
67 
68 #define D_SHOWROWNER		 1
69 #define D_SHOWSOWNER		 1
70 #define D_SHOWAGE		 1
71 #define D_SHOWDESC		 1
72 #define D_SHOWURL		 1
73 #define D_MAXREPO		 0
74 #define D_MAXREPODISP		 25
75 #define D_MAXSLCOMMDISP		 10
76 #define D_MAXCOMMITDISP		 25
77 
78 #define BUF			 8192
79 
80 #define TIMEOUT_DEFAULT		 120
81 
82 #define FCGI_CONTENT_SIZE	 65535
83 #define FCGI_PADDING_SIZE	 255
84 #define FCGI_RECORD_SIZE	 \
85     (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
86 
87 #define FCGI_ALIGNMENT		 8
88 #define FCGI_ALIGN(n)		 \
89     (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
90 
91 #define FD_RESERVE		 5
92 #define FD_NEEDED		 6
93 
94 #define FCGI_BEGIN_REQUEST	 1
95 #define FCGI_ABORT_REQUEST	 2
96 #define FCGI_END_REQUEST	 3
97 #define FCGI_PARAMS		 4
98 #define FCGI_STDIN		 5
99 #define FCGI_STDOUT		 6
100 #define FCGI_STDERR		 7
101 #define FCGI_DATA		 8
102 #define FCGI_GET_VALUES		 9
103 #define FCGI_GET_VALUES_RESULT	10
104 #define FCGI_UNKNOWN_TYPE	11
105 #define FCGI_MAXTYPE		(FCGI_UNKNOWN_TYPE)
106 
107 #define FCGI_REQUEST_COMPLETE	0
108 #define FCGI_CANT_MPX_CONN	1
109 #define FCGI_OVERLOADED		2
110 #define FCGI_UNKNOWN_ROLE	3
111 
112 #define GOTWEB_PACK_NUM_TEMPFILES     32
113 
114 enum imsg_type {
115 	IMSG_CFG_SRV = IMSG_PROC_MAX,
116 	IMSG_CFG_SOCK,
117 	IMSG_CFG_FD,
118 	IMSG_CFG_DONE,
119 	IMSG_CTL_START,
120 };
121 
122 struct env_val {
123 	SLIST_ENTRY(env_val)	 entry;
124 	char			*val;
125 };
126 SLIST_HEAD(env_head, env_val);
127 
128 struct fcgi_record_header {
129 	uint8_t		version;
130 	uint8_t		type;
131 	uint16_t	id;
132 	uint16_t	content_len;
133 	uint8_t		padding_len;
134 	uint8_t		reserved;
135 }__attribute__((__packed__));
136 
137 struct repo_dir {
138 	char			*name;
139 	char			*owner;
140 	char			*description;
141 	char			*url;
142 	char			*age;
143 	char			*path;
144 };
145 
146 struct repo_tag {
147 	TAILQ_ENTRY(repo_tag)	 entry;
148 	char			*commit_id;
149 	char			*tag_name;
150 	char			*tag_commit;
151 	char			*commit_msg;
152 	char			*tagger;
153 	time_t			 tagger_time;
154 };
155 
156 struct repo_commit {
157 	TAILQ_ENTRY(repo_commit)	 entry;
158 	char			*path;
159 	char			*refs_str;
160 	char			*commit_id; /* id_str1 */
161 	char			*parent_id; /* id_str2 */
162 	char			*tree_id;
163 	char			*author;
164 	char			*committer;
165 	char			*commit_msg;
166 	time_t			 committer_time;
167 };
168 
169 struct got_repository;
170 struct transport {
171 	TAILQ_HEAD(repo_commits_head, repo_commit)	 repo_commits;
172 	TAILQ_HEAD(repo_tags_head, repo_tag)		 repo_tags;
173 	struct got_repository	*repo;
174 	struct repo_dir		*repo_dir;
175 	struct querystring	*qs;
176 	char			*next_id;
177 	char			*prev_id;
178 	unsigned int		 repos_total;
179 	unsigned int		 next_disp;
180 	unsigned int		 prev_disp;
181 	unsigned int		 tag_count;
182 };
183 
184 enum socket_priv_fds {
185 	DIFF_FD_1,
186 	DIFF_FD_2,
187 	DIFF_FD_3,
188 	DIFF_FD_4,
189 	DIFF_FD_5,
190 	BLAME_FD_1,
191 	BLAME_FD_2,
192 	BLAME_FD_3,
193 	BLAME_FD_4,
194 	BLAME_FD_5,
195 	BLAME_FD_6,
196 	BLOB_FD_1,
197 	BLOB_FD_2,
198 	PRIV_FDS__MAX,
199 };
200 
201 struct request {
202 	struct socket			*sock;
203 	struct server			*srv;
204 	struct transport		*t;
205 	struct event			 ev;
206 	struct event			 tmo;
207 
208 	uint16_t			 id;
209 	int				 fd;
210 	int				 priv_fd[PRIV_FDS__MAX];
211 
212 	uint8_t				 buf[FCGI_RECORD_SIZE];
213 	size_t				 buf_pos;
214 	size_t				 buf_len;
215 
216 	char				 querystring[MAX_QUERYSTRING];
217 	char				 http_host[GOTWEBD_MAXTEXT];
218 	char				 document_root[MAX_DOCUMENT_ROOT];
219 	char				 server_name[MAX_SERVER_NAME];
220 
221 	struct env_head			 env;
222 	int				 env_count;
223 
224 	uint8_t				 request_started;
225 };
226 
227 struct fcgi_begin_request_body {
228 	uint16_t	role;
229 	uint8_t		flags;
230 	uint8_t		reserved[5];
231 }__attribute__((__packed__));
232 
233 struct fcgi_end_request_body {
234 	uint32_t	app_status;
235 	uint8_t		protocol_status;
236 	uint8_t		reserved[3];
237 }__packed;
238 
239 struct address {
240 	TAILQ_ENTRY(address)	 entry;
241 	struct sockaddr_storage	 ss;
242 	int			 ipproto;
243 	int			 prefixlen;
244 	in_port_t		 port;
245 	char			 ifname[IFNAMSIZ];
246 };
247 TAILQ_HEAD(addresslist, address);
248 
249 struct server {
250 	TAILQ_ENTRY(server)	 entry;
251 	struct addresslist	*al;
252 
253 	char		 name[GOTWEBD_MAXTEXT];
254 
255 	char		 repos_path[PATH_MAX];
256 	char		 site_name[GOTWEBD_MAXNAME];
257 	char		 site_owner[GOTWEBD_MAXNAME];
258 	char		 site_link[GOTWEBD_MAXTEXT];
259 	char		 logo[GOTWEBD_MAXTEXT];
260 	char		 logo_url[GOTWEBD_MAXTEXT];
261 	char		 custom_css[PATH_MAX];
262 
263 	size_t		 max_repos;
264 	size_t		 max_repos_display;
265 	size_t		 max_commits_display;
266 
267 	int		 show_site_owner;
268 	int		 show_repo_owner;
269 	int		 show_repo_age;
270 	int		 show_repo_description;
271 	int		 show_repo_cloneurl;
272 
273 	int		 unix_socket;
274 	char		 unix_socket_name[PATH_MAX];
275 
276 	int		 fcgi_socket;
277 	char		 fcgi_socket_bind[GOTWEBD_MAXTEXT];
278 	in_port_t	 fcgi_socket_port;
279 };
280 TAILQ_HEAD(serverlist, server);
281 
282 enum client_action {
283 	CLIENT_CONNECT,
284 	CLIENT_DISCONNECT,
285 };
286 
287 enum sock_type {
288 	UNIX,
289 	FCGI,
290 };
291 
292 struct socket_conf {
293 	struct addresslist	*al;
294 
295 	char		 name[GOTWEBD_MAXTEXT];
296 	char		 srv_name[GOTWEBD_MAXTEXT];
297 
298 	int		 id;
299 	int		 child_id;
300 	int		 parent_id;
301 
302 	int		 ipv4;
303 	int		 ipv6;
304 
305 	int		 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 	int		 fcgi_socket;
348 	char		 fcgi_socket_bind[GOTWEBD_MAXTEXT];
349 	in_port_t	 fcgi_socket_port;
350 };
351 
352 struct querystring {
353 	uint8_t		 action;
354 	char		*commit;
355 	char		*previd;
356 	char		*prevset;
357 	char		*file;
358 	char		*folder;
359 	char		*headref;
360 	int		 index_page;
361 	char		*index_page_str;
362 	char		*path;
363 	int		 page;
364 	char		*page_str;
365 };
366 
367 struct querystring_keys {
368 	const char	*name;
369 	int		 element;
370 };
371 
372 struct action_keys {
373 	const char	*name;
374 	int		 action;
375 };
376 
377 enum querystring_elements {
378 	ACTION,
379 	COMMIT,
380 	RFILE,
381 	FOLDER,
382 	HEADREF,
383 	INDEX_PAGE,
384 	PATH,
385 	PAGE,
386 	PREVID,
387 	QSELEM__MAX,
388 };
389 
390 enum query_actions {
391 	BLAME,
392 	BLOB,
393 	BRIEFS,
394 	COMMITS,
395 	DIFF,
396 	ERR,
397 	INDEX,
398 	SUMMARY,
399 	TAG,
400 	TAGS,
401 	TREE,
402 	ACTIONS__MAX,
403 };
404 
405 extern struct gotwebd	*gotwebd_env;
406 
407 /* sockets.c */
408 void sockets(struct privsep *, struct privsep_proc *);
409 void sockets_shutdown(void);
410 void sockets_parse_sockets(struct gotwebd *);
411 void sockets_socket_accept(int, short, void *);
412 int sockets_privinit(struct gotwebd *, struct socket *);
413 
414 /* gotweb.c */
415 const struct got_error *gotweb_render_content_type(struct request *,
416     const uint8_t *);
417 const struct got_error
418     *gotweb_render_content_type_file(struct request *, const uint8_t *, char *);
419 const struct got_error *gotweb_get_time_str(char **, time_t, int);
420 const struct got_error *gotweb_init_transport(struct transport **);
421 const struct got_error *gotweb_escape_html(char **, const char *);
422 void gotweb_free_repo_commit(struct repo_commit *);
423 void gotweb_free_repo_tag(struct repo_tag *);
424 void gotweb_process_request(struct request *);
425 void gotweb_free_transport(struct transport *);
426 
427 /* parse.y */
428 int parse_config(const char *, struct gotwebd *);
429 int cmdline_symset(char *);
430 
431 /* fcgi.c */
432 void fcgi_request(int, short, void *);
433 void fcgi_timeout(int, short, void *);
434 void fcgi_cleanup_request(struct request *);
435 void fcgi_create_end_record(struct request *);
436 void dump_fcgi_record(const char *, struct fcgi_record_header *);
437 int fcgi_gen_response(struct request *, const char *);
438 int fcgi_gen_binary_response(struct request *, const uint8_t *, int);
439 
440 /* got_operations.c */
441 const struct got_error *got_get_repo_owner(char **, struct request *, char *);
442 const struct got_error *got_get_repo_age(char **, struct request *, char *,
443     const char *, int);
444 const struct got_error *got_get_repo_commits(struct request *, int);
445 const struct got_error *got_get_repo_tags(struct request *, int);
446 const struct got_error *got_get_repo_heads(struct request *);
447 const struct got_error *got_output_repo_diff(struct request *);
448 const struct got_error *got_output_repo_tree(struct request *);
449 const struct got_error *got_output_file_blob(struct request *);
450 const struct got_error *got_output_file_blame(struct request *);
451 
452 /* config.c */
453 int config_setserver(struct gotwebd *, struct server *);
454 int config_getserver(struct gotwebd *, struct imsg *);
455 int config_setsock(struct gotwebd *, struct socket *);
456 int config_getsock(struct gotwebd *, struct imsg *);
457 int config_setfd(struct gotwebd *, struct socket *);
458 int config_getfd(struct gotwebd *, struct imsg *);
459 int config_getcfg(struct gotwebd *, struct imsg *);
460 int config_init(struct gotwebd *);