1 /*
2  * Copyright (c) 2020 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/socket.h>
21 
22 #include <unistd.h>
23 #include <fcntl.h>
24 #include <errno.h>
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <stdint.h>
28 #include <imsg.h>
29 #include <sha1.h>
30 #include <sha2.h>
31 #include <limits.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_gotconfig.h"
41 
42 #include "got_gotconfig.h"
43 
44 const struct got_error *
45 got_gotconfig_read(struct got_gotconfig **conf, const char *gotconfig_path)
46 {
47 	const struct got_error *err = NULL, *child_err = NULL;
48 	int fd = -1;
49 	int imsg_fds[2] = { -1, -1 };
50 	pid_t pid;
51 	struct imsgbuf *ibuf = NULL;
52 
53 	*conf = calloc(1, sizeof(**conf));
54 	if (*conf == NULL)
55 		return got_error_from_errno("calloc");
56 
57 	fd = open(gotconfig_path, O_RDONLY | O_CLOEXEC);
58 	if (fd == -1) {
59 		if (errno == ENOENT)
60 			return NULL;
61 		err = got_error_from_errno2("open", gotconfig_path);
62 		goto done;
63 	}
64 
65 	ibuf = calloc(1, sizeof(*ibuf));
66 	if (ibuf == NULL) {
67 		err = got_error_from_errno("calloc");
68 		goto done;
69 	}
70 
71 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
72 		err = got_error_from_errno("socketpair");
73 		goto done;
74 	}
75 
76 	pid = fork();
77 	if (pid == -1) {
78 		err = got_error_from_errno("fork");
79 		goto done;
80 	} else if (pid == 0) {
81 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GOTCONFIG,
82 		    gotconfig_path);
83 		/* not reached */
84 	}
85 
86 	if (close(imsg_fds[1]) == -1) {
87 		err = got_error_from_errno("close");
88 		goto done;
89 	}
90 	imsg_fds[1] = -1;
91 	imsg_init(ibuf, imsg_fds[0]);
92 
93 	err = got_privsep_send_gotconfig_parse_req(ibuf, fd);
94 	if (err)
95 		goto done;
96 	fd = -1;
97 
98 	err = got_privsep_send_gotconfig_author_req(ibuf);
99 	if (err)
100 		goto done;
101 
102 	err = got_privsep_recv_gotconfig_str(&(*conf)->author, ibuf);
103 	if (err)
104 		goto done;
105 
106 	err = got_privsep_send_gotconfig_allowed_signers_req(ibuf);
107 	if (err)
108 		goto done;
109 
110 	err = got_privsep_recv_gotconfig_str(&(*conf)->allowed_signers_file,
111 	    ibuf);
112 	if (err)
113 		goto done;
114 
115 	err = got_privsep_send_gotconfig_revoked_signers_req(ibuf);
116 	if (err)
117 		goto done;
118 
119 	err = got_privsep_recv_gotconfig_str(&(*conf)->revoked_signers_file,
120 	    ibuf);
121 	if (err)
122 		goto done;
123 
124 	err = got_privsep_send_gotconfig_signer_id_req(ibuf);
125 	if (err)
126 		goto done;
127 
128 	err = got_privsep_recv_gotconfig_str(&(*conf)->signer_id, ibuf);
129 	if (err)
130 		goto done;
131 
132 	err = got_privsep_send_gotconfig_remotes_req(ibuf);
133 	if (err)
134 		goto done;
135 
136 	err = got_privsep_recv_gotconfig_remotes(&(*conf)->remotes,
137 	    &(*conf)->nremotes, ibuf);
138 	if (err)
139 		goto done;
140 
141 	err = got_privsep_send_stop(imsg_fds[0]);
142 	child_err = got_privsep_wait_for_child(pid);
143 	if (child_err && err == NULL)
144 		err = child_err;
145 done:
146 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
147 		err = got_error_from_errno("close");
148 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
149 		err = got_error_from_errno("close");
150 	if (fd != -1 && close(fd) == -1 && err == NULL)
151 		err = got_error_from_errno2("close", gotconfig_path);
152 	if (err) {
153 		got_gotconfig_free(*conf);
154 		*conf = NULL;
155 	}
156 	free(ibuf);
157 	return err;
158 }