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     const char *section, const 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     const char *section, const 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 			return got_error_from_errno(
136 			    "imsg_add GITCONFIG_REMOTE");
137 
138 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1)
139 			return got_error_from_errno(
140 			    "imsg_add GITCONFIG_REMOTE");
141 		if (imsg_add(wbuf, remotes[i].fetch_url, iremote.fetch_url_len) == -1)
142 			return got_error_from_errno(
143 			    "imsg_add GITCONFIG_REMOTE");
144 		if (imsg_add(wbuf, remotes[i].send_url, iremote.send_url_len) == -1)
145 			return got_error_from_errno(
146 			    "imsg_add GITCONFIG_REMOTE");
147 
148 		wbuf->fd = -1;
149 		imsg_close(ibuf, wbuf);
150 		err = got_privsep_flush_imsg(ibuf);
151 		if (err)
152 			return err;
153 	}
154 
155 	return NULL;
156 }
157 
158 static int
159 get_boolean_val(char *val)
160 {
161     return (strcasecmp(val, "true") == 0 ||
162 	strcasecmp(val, "on") == 0 ||
163 	strcasecmp(val, "yes") == 0 ||
164 	strcmp(val, "1") == 0);
165 }
166 
167 static const struct got_error *
168 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
169 {
170 	const struct got_error *err = NULL;
171 	struct got_gitconfig_list *sections;
172 	struct got_gitconfig_list_node *node;
173 	struct got_remote_repo *remotes = NULL;
174 	int nremotes = 0, i;
175 
176 	if (gitconfig == NULL)
177 		return got_error(GOT_ERR_PRIVSEP_MSG);
178 
179 	err = got_gitconfig_get_section_list(&sections, gitconfig);
180 	if (err)
181 		return err;
182 
183 	TAILQ_FOREACH(node, &sections->fields, link) {
184 		if (strncasecmp("remote \"", node->field, 8) != 0)
185 			continue;
186 		nremotes++;
187 	}
188 
189 	if (nremotes == 0) {
190 		err = send_gitconfig_remotes(ibuf, NULL, 0);
191 		goto done;
192 	}
193 
194 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
195 	if (remotes == NULL) {
196 		err = got_error_from_errno("recallocarray");
197 		goto done;
198 	}
199 
200 	i = 0;
201 	TAILQ_FOREACH(node, &sections->fields, link) {
202 		char *name, *end, *mirror;
203 
204 		if (strncasecmp("remote \"", node->field, 8) != 0)
205 			continue;
206 
207 		name = strdup(node->field + 8);
208 		if (name == NULL) {
209 			err = got_error_from_errno("strdup");
210 			goto done;
211 		}
212 		end = strrchr(name, '"');
213 		if (end)
214 			*end = '\0';
215 		remotes[i].name = name;
216 
217 		remotes[i].fetch_url = got_gitconfig_get_str(gitconfig,
218 		    node->field, "url");
219 		if (remotes[i].fetch_url == NULL) {
220 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
221 			goto done;
222 		}
223 
224 		remotes[i].send_url = got_gitconfig_get_str(gitconfig,
225 		    node->field, "pushurl");
226 		if (remotes[i].send_url == NULL)
227 			remotes[i].send_url = got_gitconfig_get_str(gitconfig,
228 			    node->field, "url");
229 		if (remotes[i].send_url == NULL) {
230 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
231 			goto done;
232 		}
233 
234 		remotes[i].mirror_references = 0;
235 		mirror = got_gitconfig_get_str(gitconfig, node->field,
236 		    "mirror");
237 		if (mirror != NULL && get_boolean_val(mirror))
238 			remotes[i].mirror_references = 1;
239 
240 		i++;
241 	}
242 
243 	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
244 done:
245 	for (i = 0; i < nremotes; i++)
246 		free(remotes[i].name);
247 	free(remotes);
248 	got_gitconfig_free_list(sections);
249 	return err;
250 }
251 
252 static const struct got_error *
253 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
254 {
255 	char *value;
256 
257 	if (gitconfig == NULL)
258 		return got_error(GOT_ERR_PRIVSEP_MSG);
259 
260 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
261 	if (value)
262 		return send_gitconfig_str(ibuf, value);
263 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
264 	return send_gitconfig_str(ibuf, value);
265 }
266 
267 static const struct got_error *
268 gitconfig_extensions_request(struct imsgbuf *ibuf,
269     struct got_gitconfig *gitconfig)
270 {
271 	const struct got_error *err = NULL;
272 	struct got_gitconfig_list *tags;
273 	struct got_gitconfig_list_node *node;
274 	int nextensions = 0;
275 	char *val;
276 
277 	if (gitconfig == NULL)
278 		return got_error(GOT_ERR_PRIVSEP_MSG);
279 
280 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
281 	if (tags == NULL)
282 		return send_gitconfig_int(ibuf, 0);
283 
284 	TAILQ_FOREACH(node, &tags->fields, link) {
285 		val = got_gitconfig_get_str(gitconfig, "extensions",
286 		    node->field);
287 		if (get_boolean_val(val))
288 			nextensions++;
289 	}
290 
291 	err = send_gitconfig_int(ibuf, nextensions);
292 	if (err)
293 		goto done;
294 
295 	TAILQ_FOREACH(node, &tags->fields, link) {
296 		val = got_gitconfig_get_str(gitconfig, "extensions",
297 		    node->field);
298 		if (get_boolean_val(val)) {
299 			err = send_gitconfig_str(ibuf, node->field);
300 			if (err)
301 				goto done;
302 		}
303 	}
304 done:
305 	got_gitconfig_free_list(tags);
306 	return err;
307 }
308 
309 int
310 main(int argc, char *argv[])
311 {
312 	const struct got_error *err = NULL;
313 	struct imsgbuf ibuf;
314 	size_t datalen;
315 	struct got_gitconfig *gitconfig = NULL;
316 #if 0
317 	static int attached;
318 
319 	while (!attached)
320 		sleep(1);
321 #endif
322 	signal(SIGINT, catch_sigint);
323 
324 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
325 
326 #ifndef PROFILE
327 	/* revoke access to most system calls */
328 	if (pledge("stdio recvfd", NULL) == -1) {
329 		err = got_error_from_errno("pledge");
330 		got_privsep_send_error(&ibuf, err);
331 		return 1;
332 	}
333 #endif
334 
335 	for (;;) {
336 		struct imsg imsg;
337 
338 		memset(&imsg, 0, sizeof(imsg));
339 		imsg.fd = -1;
340 
341 		if (sigint_received) {
342 			err = got_error(GOT_ERR_CANCELLED);
343 			break;
344 		}
345 
346 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
347 		if (err) {
348 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
349 				err = NULL;
350 			break;
351 		}
352 
353 		if (imsg.hdr.type == GOT_IMSG_STOP)
354 			break;
355 
356 		switch (imsg.hdr.type) {
357 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
358 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
359 			if (datalen != 0) {
360 				err = got_error(GOT_ERR_PRIVSEP_LEN);
361 				break;
362 			}
363 			if (imsg.fd == -1){
364 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
365 				break;
366 			}
367 
368 			if (gitconfig)
369 				got_gitconfig_close(gitconfig);
370 			err = got_gitconfig_open(&gitconfig, imsg.fd);
371 			break;
372 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
373 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
374 			    "repositoryformatversion", 0);
375 			break;
376 		case GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST:
377 			err = gitconfig_extensions_request(&ibuf, gitconfig);
378 			break;
379 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
380 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
381 			    "name");
382 			break;
383 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
384 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
385 			    "email");
386 			break;
387 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
388 			err = gitconfig_remotes_request(&ibuf, gitconfig);
389 			break;
390 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
391 			err = gitconfig_owner_request(&ibuf, gitconfig);
392 			break;
393 		default:
394 			err = got_error(GOT_ERR_PRIVSEP_MSG);
395 			break;
396 		}
397 
398 		if (imsg.fd != -1) {
399 			if (close(imsg.fd) == -1 && err == NULL)
400 				err = got_error_from_errno("close");
401 		}
402 
403 		imsg_free(&imsg);
404 		if (err)
405 			break;
406 	}
407 
408 	imsg_clear(&ibuf);
409 	if (err) {
410 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
411 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
412 			got_privsep_send_error(&ibuf, err);
413 		}
414 	}
415 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
416 		err = got_error_from_errno("close");
417 	return err ? 1 : 0;
418 }