2 * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
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.
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.
17 #include <sys/types.h>
18 #include <sys/queue.h>
31 #include "got_compat.h"
33 #include "got_error.h"
34 #include "got_object.h"
36 #include "got_lib_delta.h"
37 #include "got_lib_inflate.h"
38 #include "got_lib_object.h"
39 #include "got_lib_object_parse.h"
40 #include "got_lib_privsep.h"
42 static volatile sig_atomic_t sigint_received;
45 catch_sigint(int signo)
51 main(int argc, char *argv[])
53 const struct got_error *err = NULL;
57 signal(SIGINT, catch_sigint);
59 imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
62 /* revoke access to most system calls */
63 if (pledge("stdio recvfd", NULL) == -1) {
64 err = got_error_from_errno("pledge");
65 got_privsep_send_error(&ibuf, err);
69 /* revoke fs access */
70 if (landlock_no_fs() == -1) {
71 err = got_error_from_errno("landlock_no_fs");
72 got_privsep_send_error(&ibuf, err);
75 if (cap_enter() == -1) {
76 err = got_error_from_errno("cap_enter");
77 got_privsep_send_error(&ibuf, err);
83 struct imsg imsg, imsg_outfd;
86 struct got_object *obj = NULL;
88 struct got_object_id id;
89 struct got_object_id expected_id;
90 struct got_inflate_checksum csum;
94 memset(&csum, 0, sizeof(csum));
95 csum.output_sha1 = &sha1_ctx;
97 memset(&imsg, 0, sizeof(imsg));
99 memset(&imsg_outfd, 0, sizeof(imsg_outfd));
102 if (sigint_received) {
103 err = got_error(GOT_ERR_CANCELLED);
107 err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
109 if (err->code == GOT_ERR_PRIVSEP_PIPE)
114 if (imsg.hdr.type == GOT_IMSG_STOP)
117 if (imsg.hdr.type != GOT_IMSG_BLOB_REQUEST) {
118 err = got_error(GOT_ERR_PRIVSEP_MSG);
122 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
123 if (datalen != sizeof(expected_id)) {
124 err = got_error(GOT_ERR_PRIVSEP_LEN);
127 memcpy(&expected_id, imsg.data, sizeof(expected_id));
130 err = got_error(GOT_ERR_PRIVSEP_NO_FD);
134 err = got_privsep_recv_imsg(&imsg_outfd, &ibuf, 0);
136 if (imsg.hdr.len == 0)
141 if (imsg_outfd.hdr.type == GOT_IMSG_STOP)
144 if (imsg_outfd.hdr.type != GOT_IMSG_BLOB_OUTFD) {
145 err = got_error(GOT_ERR_PRIVSEP_MSG);
149 datalen = imsg_outfd.hdr.len - IMSG_HEADER_SIZE;
151 err = got_error(GOT_ERR_PRIVSEP_LEN);
154 if (imsg_outfd.fd == -1) {
155 err = got_error(GOT_ERR_PRIVSEP_NO_FD);
159 err = got_object_read_header(&obj, imsg.fd);
163 if (lseek(imsg.fd, SEEK_SET, 0) == -1) {
164 err = got_error_from_errno("lseek");
168 f = fdopen(imsg.fd, "rb");
170 err = got_error_from_errno("fdopen");
174 if (obj->size + obj->hdrlen <=
175 GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
176 err = got_inflate_to_mem(&buf, &size, NULL, &csum, f);
180 err = got_inflate_to_fd(&size, f, &csum, imsg_outfd.fd);
184 SHA1Final(id.sha1, &sha1_ctx);
185 if (got_object_id_cmp(&expected_id, &id) != 0) {
186 err = got_error_checksum(&expected_id);
190 if (size < obj->hdrlen) {
191 err = got_error(GOT_ERR_BAD_OBJ_HDR);
195 err = got_privsep_send_blob(&ibuf, size, obj->hdrlen, buf);
199 if (fclose(f) == EOF && err == NULL)
200 err = got_error_from_errno("fclose");
201 } else if (imsg.fd != -1) {
202 if (close(imsg.fd) == -1 && err == NULL)
203 err = got_error_from_errno("close");
205 if (imsg_outfd.fd != -1) {
206 if (close(imsg_outfd.fd) == -1 && err == NULL)
207 err = got_error_from_errno("close");
211 imsg_free(&imsg_outfd);
213 got_object_close(obj);
220 if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
221 fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
222 got_privsep_send_error(&ibuf, err);
225 if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
226 err = got_error_from_errno("close");