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 <limits.h>
30 
31 #include "got_compat.h"
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_repository.h"
35 
36 #include "got_lib_delta.h"
37 #include "got_lib_object.h"
38 #include "got_lib_privsep.h"
39 #include "got_lib_gotconfig.h"
40 
41 #include "got_gotconfig.h"
42 
43 const struct got_error *
44 got_gotconfig_read(struct got_gotconfig **conf, const char *gotconfig_path)
45 {
46 	const struct got_error *err = NULL, *child_err = NULL;
47 	int fd = -1;
48 	int imsg_fds[2] = { -1, -1 };
49 	pid_t pid;
50 	struct imsgbuf *ibuf = NULL;
51 
52 	*conf = calloc(1, sizeof(**conf));
53 	if (*conf == NULL)
54 		return got_error_from_errno("calloc");
55 
56 	fd = open(gotconfig_path, O_RDONLY | O_CLOEXEC);
57 	if (fd == -1) {
58 		if (errno == ENOENT)
59 			return NULL;
60 		err = got_error_from_errno2("open", gotconfig_path);
61 		goto done;
62 	}
63 
64 	ibuf = calloc(1, sizeof(*ibuf));
65 	if (ibuf == NULL) {
66 		err = got_error_from_errno("calloc");
67 		goto done;
68 	}
69 
70 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
71 		err = got_error_from_errno("socketpair");
72 		goto done;
73 	}
74 
75 	pid = fork();
76 	if (pid == -1) {
77 		err = got_error_from_errno("fork");
78 		goto done;
79 	} else if (pid == 0) {
80 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GOTCONFIG,
81 		    gotconfig_path);
82 		/* not reached */
83 	}
84 
85 	if (close(imsg_fds[1]) == -1) {
86 		err = got_error_from_errno("close");
87 		goto done;
88 	}
89 	imsg_fds[1] = -1;
90 	imsg_init(ibuf, imsg_fds[0]);
91 
92 	err = got_privsep_send_gotconfig_parse_req(ibuf, fd);
93 	if (err)
94 		goto done;
95 	fd = -1;
96 
97 	err = got_privsep_send_gotconfig_author_req(ibuf);
98 	if (err)
99 		goto done;
100 
101 	err = got_privsep_recv_gotconfig_str(&(*conf)->author, ibuf);
102 	if (err)
103 		goto done;
104 
105 	err = got_privsep_send_gotconfig_allowed_signers_req(ibuf);
106 	if (err)
107 		goto done;
108 
109 	err = got_privsep_recv_gotconfig_str(&(*conf)->allowed_signers_file,
110 	    ibuf);
111 	if (err)
112 		goto done;
113 
114 	err = got_privsep_send_gotconfig_revoked_signers_req(ibuf);
115 	if (err)
116 		goto done;
117 
118 	err = got_privsep_recv_gotconfig_str(&(*conf)->revoked_signers_file,
119 	    ibuf);
120 	if (err)
121 		goto done;
122 
123 	err = got_privsep_send_gotconfig_signer_id_req(ibuf);
124 	if (err)
125 		goto done;
126 
127 	err = got_privsep_recv_gotconfig_str(&(*conf)->signer_id, ibuf);
128 	if (err)
129 		goto done;
130 
131 	err = got_privsep_send_gotconfig_remotes_req(ibuf);
132 	if (err)
133 		goto done;
134 
135 	err = got_privsep_recv_gotconfig_remotes(&(*conf)->remotes,
136 	    &(*conf)->nremotes, ibuf);
137 	if (err)
138 		goto done;
139 
140 	err = got_privsep_send_stop(imsg_fds[0]);
141 	child_err = got_privsep_wait_for_child(pid);
142 	if (child_err && err == NULL)
143 		err = child_err;
144 done:
145 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
146 		err = got_error_from_errno("close");
147 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
148 		err = got_error_from_errno("close");
149 	if (fd != -1 && close(fd) == -1 && err == NULL)
150 		err = got_error_from_errno2("close", gotconfig_path);
151 	if (err) {
152 		got_gotconfig_free(*conf);
153 		*conf = NULL;
154 	}
155 	free(ibuf);
156 	return err;
157 }