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 #include <sys/syslimits.h>
22 
23 #include <stdint.h>
24 #include <imsg.h>
25 #include <limits.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sha1.h>
31 #include <unistd.h>
32 #include <zlib.h>
33 
34 #include "got_error.h"
35 #include "got_object.h"
36 #include "got_repository.h"
37 
38 #include "got_lib_delta.h"
39 #include "got_lib_object.h"
40 #include "got_lib_privsep.h"
41 #include "got_lib_gitconfig.h"
42 
43 static volatile sig_atomic_t sigint_received;
44 
45 static void
46 catch_sigint(int signo)
47 {
48 	sigint_received = 1;
49 }
50 
51 static const struct got_error *
52 send_gitconfig_int(struct imsgbuf *ibuf, int value)
53 {
54 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
55 	    &value, sizeof(value)) == -1)
56 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
57 
58 	return got_privsep_flush_imsg(ibuf);
59 }
60 
61 static const struct got_error *
62 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
63     char *section, char *tag, int def)
64 {
65 	int value;
66 
67 	if (gitconfig == NULL)
68 		return got_error(GOT_ERR_PRIVSEP_MSG);
69 
70 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
71 	return send_gitconfig_int(ibuf, value);
72 }
73 
74 static const struct got_error *
75 send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
76 {
77 	size_t len = value ? strlen(value) + 1 : 0;
78 
79 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
80 	    value, len) == -1)
81 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
82 
83 	return got_privsep_flush_imsg(ibuf);
84 }
85 
86 static const struct got_error *
87 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
88     char *section, char *tag)
89 {
90 	char *value;
91 
92 	if (gitconfig == NULL)
93 		return got_error(GOT_ERR_PRIVSEP_MSG);
94 
95 	value = got_gitconfig_get_str(gitconfig, section, tag);
96 	return send_gitconfig_str(ibuf, value);
97 }
98 
99 static const struct got_error *
100 send_gitconfig_remotes(struct imsgbuf *ibuf, struct got_remote_repo *remotes,
101     int nremotes)
102 {
103 	const struct got_error *err = NULL;
104 	struct got_imsg_remotes iremotes;
105 	int i;
106 
107 	iremotes.nremotes = nremotes;
108 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
109 	    &iremotes, sizeof(iremotes)) == -1)
110 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
111 
112 	err = got_privsep_flush_imsg(ibuf);
113 	imsg_clear(ibuf);
114 	if (err)
115 		return err;
116 
117 	for (i = 0; i < nremotes; i++) {
118 		struct got_imsg_remote iremote;
119 		size_t len = sizeof(iremote);
120 		struct ibuf *wbuf;
121 
122 		iremote.mirror_references = remotes[i].mirror_references;
123 		iremote.name_len = strlen(remotes[i].name);
124 		len += iremote.name_len;
125 		iremote.url_len = strlen(remotes[i].url);
126 		len += iremote.url_len;
127 
128 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
129 		if (wbuf == NULL)
130 			return got_error_from_errno(
131 			    "imsg_create GITCONFIG_REMOTE");
132 
133 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
134 			err = got_error_from_errno(
135 			    "imsg_add GITCONFIG_REMOTE");
136 			ibuf_free(wbuf);
137 			return err;
138 		}
139 
140 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
141 			err = got_error_from_errno(
142 			    "imsg_add GITCONFIG_REMOTE");
143 			ibuf_free(wbuf);
144 			return err;
145 		}
146 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
147 			err = got_error_from_errno(
148 			    "imsg_add GITCONFIG_REMOTE");
149 			ibuf_free(wbuf);
150 			return err;
151 		}
152 
153 		wbuf->fd = -1;
154 		imsg_close(ibuf, wbuf);
155 		err = got_privsep_flush_imsg(ibuf);
156 		if (err)
157 			return err;
158 	}
159 
160 	return NULL;
161 }
162 
163 
164 static const struct got_error *
165 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
166 {
167 	const struct got_error *err = NULL;
168 	struct got_gitconfig_list *sections;
169 	struct got_gitconfig_list_node *node;
170 	struct got_remote_repo *remotes = NULL;
171 	int nremotes = 0, i;
172 
173 	if (gitconfig == NULL)
174 		return got_error(GOT_ERR_PRIVSEP_MSG);
175 
176 	err = got_gitconfig_get_section_list(&sections, gitconfig);
177 	if (err)
178 		return err;
179 
180 	TAILQ_FOREACH(node, &sections->fields, link) {
181 		if (strncasecmp("remote \"", node->field, 8) != 0)
182 			continue;
183 		nremotes++;
184 	}
185 
186 	if (nremotes == 0) {
187 		err = send_gitconfig_remotes(ibuf, NULL, 0);
188 		goto done;
189 	}
190 
191 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
192 	if (remotes == NULL) {
193 		err = got_error_from_errno("recallocarray");
194 		goto done;
195 	}
196 
197 	i = 0;
198 	TAILQ_FOREACH(node, &sections->fields, link) {
199 		char *name, *end, *mirror;
200 
201 		if (strncasecmp("remote \"", node->field, 8) != 0)
202 			continue;
203 
204 		name = strdup(node->field + 8);
205 		if (name == NULL) {
206 			err = got_error_from_errno("strdup");
207 			goto done;
208 		}
209 		end = strrchr(name, '"');
210 		if (end)
211 			*end = '\0';
212 		remotes[i].name = name;
213 
214 		remotes[i].url = got_gitconfig_get_str(gitconfig,
215 		    node->field, "url");
216 		if (remotes[i].url == NULL) {
217 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
218 			goto done;
219 		}
220 
221 		remotes[i].mirror_references = 0;
222 		mirror = got_gitconfig_get_str(gitconfig, node->field,
223 		    "mirror");
224 		if (mirror != NULL &&
225 		    (strcasecmp(mirror, "true") == 0 ||
226 		    strcasecmp(mirror, "on") == 0 ||
227 		    strcasecmp(mirror, "yes") == 0 ||
228 		    strcmp(mirror, "1") == 0))
229 			remotes[i].mirror_references = 1;
230 
231 		i++;
232 	}
233 
234 	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
235 done:
236 	for (i = 0; i < nremotes; i++)
237 		free(remotes[i].name);
238 	free(remotes);
239 	got_gitconfig_free_list(sections);
240 	return err;
241 }
242 
243 static const struct got_error *
244 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
245 {
246 	char *value;
247 
248 	if (gitconfig == NULL)
249 		return got_error(GOT_ERR_PRIVSEP_MSG);
250 
251 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
252 	if (value)
253 		return send_gitconfig_str(ibuf, value);
254 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
255 	return send_gitconfig_str(ibuf, value);
256 }
257 
258 int
259 main(int argc, char *argv[])
260 {
261 	const struct got_error *err = NULL;
262 	struct imsgbuf ibuf;
263 	size_t datalen;
264 	struct got_gitconfig *gitconfig = NULL;
265 #if 0
266 	static int attached;
267 
268 	while (!attached)
269 		sleep(1);
270 #endif
271 	signal(SIGINT, catch_sigint);
272 
273 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
274 
275 #ifndef PROFILE
276 	/* revoke access to most system calls */
277 	if (pledge("stdio recvfd", NULL) == -1) {
278 		err = got_error_from_errno("pledge");
279 		got_privsep_send_error(&ibuf, err);
280 		return 1;
281 	}
282 #endif
283 
284 	for (;;) {
285 		struct imsg imsg;
286 
287 		memset(&imsg, 0, sizeof(imsg));
288 		imsg.fd = -1;
289 
290 		if (sigint_received) {
291 			err = got_error(GOT_ERR_CANCELLED);
292 			break;
293 		}
294 
295 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
296 		if (err) {
297 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
298 				err = NULL;
299 			break;
300 		}
301 
302 		if (imsg.hdr.type == GOT_IMSG_STOP)
303 			break;
304 
305 		switch (imsg.hdr.type) {
306 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
307 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
308 			if (datalen != 0) {
309 				err = got_error(GOT_ERR_PRIVSEP_LEN);
310 				break;
311 			}
312 			if (imsg.fd == -1){
313 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
314 				break;
315 			}
316 
317 			if (gitconfig)
318 				got_gitconfig_close(gitconfig);
319 			err = got_gitconfig_open(&gitconfig, imsg.fd);
320 			break;
321 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
322 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
323 			    "repositoryformatversion", 0);
324 			break;
325 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
326 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
327 			    "name");
328 			break;
329 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
330 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
331 			    "email");
332 			break;
333 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
334 			err = gitconfig_remotes_request(&ibuf, gitconfig);
335 			break;
336 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
337 			err = gitconfig_owner_request(&ibuf, gitconfig);
338 			break;
339 		default:
340 			err = got_error(GOT_ERR_PRIVSEP_MSG);
341 			break;
342 		}
343 
344 		if (imsg.fd != -1) {
345 			if (close(imsg.fd) == -1 && err == NULL)
346 				err = got_error_from_errno("close");
347 		}
348 
349 		imsg_free(&imsg);
350 		if (err)
351 			break;
352 	}
353 
354 	imsg_clear(&ibuf);
355 	if (err) {
356 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
357 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
358 			got_privsep_send_error(&ibuf, err);
359 		}
360 	}
361 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
362 		err = got_error_from_errno("close");
363 	return err ? 1 : 0;
364 }