1 /*
2  * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 
22 #include <stdint.h>
23 #include <imsg.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sha1.h>
30 #include <unistd.h>
31 #include <zlib.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_repository.h"
36 
37 #include "got_lib_delta.h"
38 #include "got_lib_object.h"
39 #include "got_lib_privsep.h"
40 #include "got_lib_gitconfig.h"
41 
42 static volatile sig_atomic_t sigint_received;
43 
44 static void
45 catch_sigint(int signo)
46 {
47 	sigint_received = 1;
48 }
49 
50 static const struct got_error *
51 send_gitconfig_int(struct imsgbuf *ibuf, int value)
52 {
53 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
54 	    &value, sizeof(value)) == -1)
55 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
56 
57 	return got_privsep_flush_imsg(ibuf);
58 }
59 
60 static const struct got_error *
61 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
62     char *section, char *tag, int def)
63 {
64 	int value;
65 
66 	if (gitconfig == NULL)
67 		return got_error(GOT_ERR_PRIVSEP_MSG);
68 
69 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
70 	return send_gitconfig_int(ibuf, value);
71 }
72 
73 static const struct got_error *
74 send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
75 {
76 	size_t len = value ? strlen(value) : 0;
77 
78 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
79 	    value, len) == -1)
80 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
81 
82 	return got_privsep_flush_imsg(ibuf);
83 }
84 
85 static const struct got_error *
86 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
87     char *section, char *tag)
88 {
89 	char *value;
90 
91 	if (gitconfig == NULL)
92 		return got_error(GOT_ERR_PRIVSEP_MSG);
93 
94 	value = got_gitconfig_get_str(gitconfig, section, tag);
95 	return send_gitconfig_str(ibuf, value);
96 }
97 
98 static const struct got_error *
99 send_gitconfig_remotes(struct imsgbuf *ibuf, struct got_remote_repo *remotes,
100     int nremotes)
101 {
102 	const struct got_error *err = NULL;
103 	struct got_imsg_remotes iremotes;
104 	int i;
105 
106 	iremotes.nremotes = nremotes;
107 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
108 	    &iremotes, sizeof(iremotes)) == -1)
109 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
110 
111 	err = got_privsep_flush_imsg(ibuf);
112 	imsg_clear(ibuf);
113 	if (err)
114 		return err;
115 
116 	for (i = 0; i < nremotes; i++) {
117 		struct got_imsg_remote iremote;
118 		size_t len = sizeof(iremote);
119 		struct ibuf *wbuf;
120 
121 		iremote.mirror_references = remotes[i].mirror_references;
122 		iremote.name_len = strlen(remotes[i].name);
123 		len += iremote.name_len;
124 		iremote.fetch_url_len = strlen(remotes[i].fetch_url);
125 		len += iremote.fetch_url_len;
126 		iremote.send_url_len = strlen(remotes[i].send_url);
127 		len += iremote.send_url_len;
128 
129 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
130 		if (wbuf == NULL)
131 			return got_error_from_errno(
132 			    "imsg_create GITCONFIG_REMOTE");
133 
134 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
135 			err = got_error_from_errno(
136 			    "imsg_add GITCONFIG_REMOTE");
137 			ibuf_free(wbuf);
138 			return err;
139 		}
140 
141 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
142 			err = got_error_from_errno(
143 			    "imsg_add GITCONFIG_REMOTE");
144 			ibuf_free(wbuf);
145 			return err;
146 		}
147 		if (imsg_add(wbuf, remotes[i].fetch_url, iremote.fetch_url_len) == -1) {
148 			err = got_error_from_errno(
149 			    "imsg_add GITCONFIG_REMOTE");
150 			ibuf_free(wbuf);
151 			return err;
152 		}
153 		if (imsg_add(wbuf, remotes[i].send_url, iremote.send_url_len) == -1) {
154 			err = got_error_from_errno(
155 			    "imsg_add GITCONFIG_REMOTE");
156 			ibuf_free(wbuf);
157 			return err;
158 		}
159 
160 		wbuf->fd = -1;
161 		imsg_close(ibuf, wbuf);
162 		err = got_privsep_flush_imsg(ibuf);
163 		if (err)
164 			return err;
165 	}
166 
167 	return NULL;
168 }
169 
170 static int
171 get_boolean_val(char *val)
172 {
173     return (strcasecmp(val, "true") == 0 ||
174 	strcasecmp(val, "on") == 0 ||
175 	strcasecmp(val, "yes") == 0 ||
176 	strcmp(val, "1") == 0);
177 }
178 
179 static const struct got_error *
180 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
181 {
182 	const struct got_error *err = NULL;
183 	struct got_gitconfig_list *sections;
184 	struct got_gitconfig_list_node *node;
185 	struct got_remote_repo *remotes = NULL;
186 	int nremotes = 0, i;
187 
188 	if (gitconfig == NULL)
189 		return got_error(GOT_ERR_PRIVSEP_MSG);
190 
191 	err = got_gitconfig_get_section_list(&sections, gitconfig);
192 	if (err)
193 		return err;
194 
195 	TAILQ_FOREACH(node, &sections->fields, link) {
196 		if (strncasecmp("remote \"", node->field, 8) != 0)
197 			continue;
198 		nremotes++;
199 	}
200 
201 	if (nremotes == 0) {
202 		err = send_gitconfig_remotes(ibuf, NULL, 0);
203 		goto done;
204 	}
205 
206 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
207 	if (remotes == NULL) {
208 		err = got_error_from_errno("recallocarray");
209 		goto done;
210 	}
211 
212 	i = 0;
213 	TAILQ_FOREACH(node, &sections->fields, link) {
214 		char *name, *end, *mirror;
215 
216 		if (strncasecmp("remote \"", node->field, 8) != 0)
217 			continue;
218 
219 		name = strdup(node->field + 8);
220 		if (name == NULL) {
221 			err = got_error_from_errno("strdup");
222 			goto done;
223 		}
224 		end = strrchr(name, '"');
225 		if (end)
226 			*end = '\0';
227 		remotes[i].name = name;
228 
229 		remotes[i].fetch_url = got_gitconfig_get_str(gitconfig,
230 		    node->field, "url");
231 		if (remotes[i].fetch_url == NULL) {
232 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
233 			goto done;
234 		}
235 
236 		remotes[i].send_url = got_gitconfig_get_str(gitconfig,
237 		    node->field, "pushurl");
238 		if (remotes[i].send_url == NULL)
239 			remotes[i].send_url = got_gitconfig_get_str(gitconfig,
240 			    node->field, "url");
241 		if (remotes[i].send_url == NULL) {
242 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
243 			goto done;
244 		}
245 
246 		remotes[i].mirror_references = 0;
247 		mirror = got_gitconfig_get_str(gitconfig, node->field,
248 		    "mirror");
249 		if (mirror != NULL && get_boolean_val(mirror))
250 			remotes[i].mirror_references = 1;
251 
252 		i++;
253 	}
254 
255 	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
256 done:
257 	for (i = 0; i < nremotes; i++)
258 		free(remotes[i].name);
259 	free(remotes);
260 	got_gitconfig_free_list(sections);
261 	return err;
262 }
263 
264 static const struct got_error *
265 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
266 {
267 	char *value;
268 
269 	if (gitconfig == NULL)
270 		return got_error(GOT_ERR_PRIVSEP_MSG);
271 
272 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
273 	if (value)
274 		return send_gitconfig_str(ibuf, value);
275 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
276 	return send_gitconfig_str(ibuf, value);
277 }
278 
279 static const struct got_error *
280 gitconfig_extensions_request(struct imsgbuf *ibuf,
281     struct got_gitconfig *gitconfig)
282 {
283 	const struct got_error *err = NULL;
284 	struct got_gitconfig_list *tags;
285 	struct got_gitconfig_list_node *node;
286 	int nextensions = 0;
287 	char *val;
288 
289 	if (gitconfig == NULL)
290 		return got_error(GOT_ERR_PRIVSEP_MSG);
291 
292 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
293 	if (tags == NULL)
294 		return send_gitconfig_int(ibuf, 0);
295 
296 	TAILQ_FOREACH(node, &tags->fields, link) {
297 		val = got_gitconfig_get_str(gitconfig, "extensions",
298 		    node->field);
299 		if (get_boolean_val(val))
300 			nextensions++;
301 	}
302 
303 	err = send_gitconfig_int(ibuf, nextensions);
304 	if (err)
305 		goto done;
306 
307 	TAILQ_FOREACH(node, &tags->fields, link) {
308 		val = got_gitconfig_get_str(gitconfig, "extensions",
309 		    node->field);
310 		if (get_boolean_val(val)) {
311 			err = send_gitconfig_str(ibuf, node->field);
312 			if (err)
313 				goto done;
314 		}
315 	}
316 done:
317 	got_gitconfig_free_list(tags);
318 	return err;
319 }
320 
321 int
322 main(int argc, char *argv[])
323 {
324 	const struct got_error *err = NULL;
325 	struct imsgbuf ibuf;
326 	size_t datalen;
327 	struct got_gitconfig *gitconfig = NULL;
328 #if 0
329 	static int attached;
330 
331 	while (!attached)
332 		sleep(1);
333 #endif
334 	signal(SIGINT, catch_sigint);
335 
336 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
337 
338 #ifndef PROFILE
339 	/* revoke access to most system calls */
340 	if (pledge("stdio recvfd", NULL) == -1) {
341 		err = got_error_from_errno("pledge");
342 		got_privsep_send_error(&ibuf, err);
343 		return 1;
344 	}
345 #endif
346 
347 	for (;;) {
348 		struct imsg imsg;
349 
350 		memset(&imsg, 0, sizeof(imsg));
351 		imsg.fd = -1;
352 
353 		if (sigint_received) {
354 			err = got_error(GOT_ERR_CANCELLED);
355 			break;
356 		}
357 
358 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
359 		if (err) {
360 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
361 				err = NULL;
362 			break;
363 		}
364 
365 		if (imsg.hdr.type == GOT_IMSG_STOP)
366 			break;
367 
368 		switch (imsg.hdr.type) {
369 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
370 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
371 			if (datalen != 0) {
372 				err = got_error(GOT_ERR_PRIVSEP_LEN);
373 				break;
374 			}
375 			if (imsg.fd == -1){
376 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
377 				break;
378 			}
379 
380 			if (gitconfig)
381 				got_gitconfig_close(gitconfig);
382 			err = got_gitconfig_open(&gitconfig, imsg.fd);
383 			break;
384 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
385 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
386 			    "repositoryformatversion", 0);
387 			break;
388 		case GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST:
389 			err = gitconfig_extensions_request(&ibuf, gitconfig);
390 			break;
391 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
392 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
393 			    "name");
394 			break;
395 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
396 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
397 			    "email");
398 			break;
399 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
400 			err = gitconfig_remotes_request(&ibuf, gitconfig);
401 			break;
402 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
403 			err = gitconfig_owner_request(&ibuf, gitconfig);
404 			break;
405 		default:
406 			err = got_error(GOT_ERR_PRIVSEP_MSG);
407 			break;
408 		}
409 
410 		if (imsg.fd != -1) {
411 			if (close(imsg.fd) == -1 && err == NULL)
412 				err = got_error_from_errno("close");
413 		}
414 
415 		imsg_free(&imsg);
416 		if (err)
417 			break;
418 	}
419 
420 	imsg_clear(&ibuf);
421 	if (err) {
422 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
423 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
424 			got_privsep_send_error(&ibuf, err);
425 		}
426 	}
427 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
428 		err = got_error_from_errno("close");
429 	return err ? 1 : 0;
430 }