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 <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 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
52     char *section, char *tag, int def)
53 {
54 	int value;
55 
56 	if (gitconfig == NULL)
57 		return got_error(GOT_ERR_PRIVSEP_MSG);
58 
59 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
60 	return got_privsep_send_gitconfig_int(ibuf, value);
61 }
62 
63 static const struct got_error *
64 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
65     char *section, char *tag)
66 {
67 	char *value;
68 
69 	if (gitconfig == NULL)
70 		return got_error(GOT_ERR_PRIVSEP_MSG);
71 
72 	value = got_gitconfig_get_str(gitconfig, section, tag);
73 	return got_privsep_send_gitconfig_str(ibuf, value);
74 }
75 
76 static const struct got_error *
77 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
78 {
79 	const struct got_error *err = NULL;
80 	struct got_gitconfig_list *sections;
81 	struct got_gitconfig_list_node *node;
82 	struct got_remote_repo *remotes = NULL;
83 	int nremotes = 0, i;
84 
85 	if (gitconfig == NULL)
86 		return got_error(GOT_ERR_PRIVSEP_MSG);
87 
88 	err = got_gitconfig_get_section_list(&sections, gitconfig);
89 	if (err)
90 		return err;
91 
92 	TAILQ_FOREACH(node, &sections->fields, link) {
93 		if (strncasecmp("remote \"", node->field, 8) != 0)
94 			continue;
95 		nremotes++;
96 	}
97 
98 	if (nremotes == 0) {
99 		err = got_privsep_send_gitconfig_remotes(ibuf, NULL, 0);
100 		goto done;
101 	}
102 
103 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
104 	if (remotes == NULL) {
105 		err = got_error_from_errno("recallocarray");
106 		goto done;
107 	}
108 
109 	i = 0;
110 	TAILQ_FOREACH(node, &sections->fields, link) {
111 		char *name, *end;
112 
113 		if (strncasecmp("remote \"", node->field, 8) != 0)
114 			continue;
115 
116 		name = strdup(node->field + 8);
117 		if (name == NULL) {
118 			err = got_error_from_errno("strdup");
119 			goto done;
120 		}
121 		end = strrchr(name, '"');
122 		if (end)
123 			*end = '\0';
124 		remotes[i].name = name;
125 
126 		remotes[i].url = got_gitconfig_get_str(gitconfig,
127 		    node->field, "url");
128 		if (remotes[i].url == NULL) {
129 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
130 			goto done;
131 		}
132 
133 		i++;
134 	}
135 
136 	err = got_privsep_send_gitconfig_remotes(ibuf, remotes, nremotes);
137 done:
138 	for (i = 0; i < nremotes; i++)
139 		free(remotes[i].name);
140 	free(remotes);
141 	got_gitconfig_free_list(sections);
142 	return err;
143 }
144 
145 static const struct got_error *
146 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
147 {
148 	char *value;
149 
150 	if (gitconfig == NULL)
151 		return got_error(GOT_ERR_PRIVSEP_MSG);
152 
153 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
154 	if (value)
155 		return got_privsep_send_gitconfig_str(ibuf, value);
156 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
157 	return got_privsep_send_gitconfig_str(ibuf, value);
158 }
159 
160 int
161 main(int argc, char *argv[])
162 {
163 	const struct got_error *err = NULL;
164 	struct imsgbuf ibuf;
165 	size_t datalen;
166 	struct got_gitconfig *gitconfig = NULL;
167 #if 0
168 	static int attached;
169 
170 	while (!attached)
171 		sleep(1);
172 #endif
173 	signal(SIGINT, catch_sigint);
174 
175 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
176 
177 #ifndef PROFILE
178 	/* revoke access to most system calls */
179 	if (pledge("stdio recvfd", NULL) == -1) {
180 		err = got_error_from_errno("pledge");
181 		got_privsep_send_error(&ibuf, err);
182 		return 1;
183 	}
184 #endif
185 
186 	for (;;) {
187 		struct imsg imsg;
188 
189 		memset(&imsg, 0, sizeof(imsg));
190 		imsg.fd = -1;
191 
192 		if (sigint_received) {
193 			err = got_error(GOT_ERR_CANCELLED);
194 			break;
195 		}
196 
197 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
198 		if (err) {
199 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
200 				err = NULL;
201 			break;
202 		}
203 
204 		if (imsg.hdr.type == GOT_IMSG_STOP)
205 			break;
206 
207 		switch (imsg.hdr.type) {
208 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
209 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
210 			if (datalen != 0) {
211 				err = got_error(GOT_ERR_PRIVSEP_LEN);
212 				break;
213 			}
214 			if (imsg.fd == -1){
215 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
216 				break;
217 			}
218 
219 			if (gitconfig)
220 				got_gitconfig_close(gitconfig);
221 			err = got_gitconfig_open(&gitconfig, imsg.fd);
222 			break;
223 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
224 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
225 			    "repositoryformatversion", 0);
226 			break;
227 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
228 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
229 			    "name");
230 			break;
231 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
232 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
233 			    "email");
234 			break;
235 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
236 			err = gitconfig_remotes_request(&ibuf, gitconfig);
237 			break;
238 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
239 			err = gitconfig_owner_request(&ibuf, gitconfig);
240 			break;
241 		default:
242 			err = got_error(GOT_ERR_PRIVSEP_MSG);
243 			break;
244 		}
245 
246 		if (imsg.fd != -1) {
247 			if (close(imsg.fd) == -1 && err == NULL)
248 				err = got_error_from_errno("close");
249 		}
250 
251 		imsg_free(&imsg);
252 		if (err)
253 			break;
254 	}
255 
256 	imsg_clear(&ibuf);
257 	if (err) {
258 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
259 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
260 			got_privsep_send_error(&ibuf, err);
261 		}
262 	}
263 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
264 		err = got_error_from_errno("close");
265 	return err ? 1 : 0;
266 }