Blob


1 /*
2 * Copyright (c) 2018, 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 */
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
22 #include <stdint.h>
23 #include <limits.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29 #include <zlib.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_hash.h"
38 #include "got_lib_inflate.h"
39 #include "got_lib_object.h"
40 #include "got_lib_object_parse.h"
41 #include "got_lib_privsep.h"
43 static volatile sig_atomic_t sigint_received;
45 static void
46 catch_sigint(int signo)
47 {
48 sigint_received = 1;
49 }
51 int
52 main(int argc, char *argv[])
53 {
54 const struct got_error *err = NULL;
55 struct imsgbuf ibuf;
56 size_t datalen;
58 signal(SIGINT, catch_sigint);
60 imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
62 #ifndef PROFILE
63 /* revoke access to most system calls */
64 if (pledge("stdio recvfd", NULL) == -1) {
65 err = got_error_from_errno("pledge");
66 got_privsep_send_error(&ibuf, err);
67 return 1;
68 }
70 /* revoke fs access */
71 if (landlock_no_fs() == -1) {
72 err = got_error_from_errno("landlock_no_fs");
73 got_privsep_send_error(&ibuf, err);
74 return 1;
75 }
76 if (cap_enter() == -1) {
77 err = got_error_from_errno("cap_enter");
78 got_privsep_send_error(&ibuf, err);
79 return 1;
80 }
81 #endif
83 for (;;) {
84 struct imsg imsg, imsg_outfd;
85 FILE *f = NULL;
86 int fd = -1, outfd = -1;
87 size_t size;
88 struct got_object *obj = NULL;
89 uint8_t *buf = NULL;
90 struct got_object_id id;
91 struct got_object_id expected_id;
92 struct got_inflate_checksum csum;
93 struct got_hash ctx;
95 got_hash_init(&ctx, GOT_HASH_SHA1);
96 memset(&csum, 0, sizeof(csum));
97 csum.output_ctx = &ctx;
99 memset(&imsg, 0, sizeof(imsg));
100 memset(&imsg_outfd, 0, sizeof(imsg_outfd));
102 if (sigint_received) {
103 err = got_error(GOT_ERR_CANCELLED);
104 break;
107 err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
108 if (err) {
109 if (err->code == GOT_ERR_PRIVSEP_PIPE)
110 err = NULL;
111 break;
114 if (imsg.hdr.type == GOT_IMSG_STOP)
115 break;
117 if (imsg.hdr.type != GOT_IMSG_BLOB_REQUEST) {
118 err = got_error(GOT_ERR_PRIVSEP_MSG);
119 goto done;
122 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
123 if (datalen != sizeof(expected_id)) {
124 err = got_error(GOT_ERR_PRIVSEP_LEN);
125 goto done;
127 memcpy(&expected_id, imsg.data, sizeof(expected_id));
129 fd = imsg_get_fd(&imsg);
130 if (fd == -1) {
131 err = got_error(GOT_ERR_PRIVSEP_NO_FD);
132 goto done;
135 err = got_privsep_recv_imsg(&imsg_outfd, &ibuf, 0);
136 if (err) {
137 if (imsg.hdr.len == 0)
138 err = NULL;
139 break;
142 if (imsg_outfd.hdr.type == GOT_IMSG_STOP)
143 break;
145 if (imsg_outfd.hdr.type != GOT_IMSG_BLOB_OUTFD) {
146 err = got_error(GOT_ERR_PRIVSEP_MSG);
147 goto done;
150 datalen = imsg_outfd.hdr.len - IMSG_HEADER_SIZE;
151 if (datalen != 0) {
152 err = got_error(GOT_ERR_PRIVSEP_LEN);
153 goto done;
155 outfd = imsg_get_fd(&imsg_outfd);
156 if (outfd == -1) {
157 err = got_error(GOT_ERR_PRIVSEP_NO_FD);
158 goto done;
161 err = got_object_read_header(&obj, fd);
162 if (err)
163 goto done;
165 if (lseek(fd, SEEK_SET, 0) == -1) {
166 err = got_error_from_errno("lseek");
167 goto done;
170 f = fdopen(fd, "rb");
171 if (f == NULL) {
172 err = got_error_from_errno("fdopen");
173 goto done;
175 fd = -1;
177 if (obj->size + obj->hdrlen <=
178 GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
179 err = got_inflate_to_mem(&buf, &size, NULL, &csum, f);
180 if (err)
181 goto done;
182 } else {
183 err = got_inflate_to_fd(&size, f, &csum, outfd);
184 if (err)
185 goto done;
187 got_hash_final_object_id(&ctx, &id);
188 if (got_object_id_cmp(&expected_id, &id) != 0) {
189 err = got_error_checksum(&expected_id);
190 goto done;
193 if (size < obj->hdrlen) {
194 err = got_error(GOT_ERR_BAD_OBJ_HDR);
195 goto done;
198 err = got_privsep_send_blob(&ibuf, size, obj->hdrlen, buf);
199 done:
200 free(buf);
201 if (f && fclose(f) == EOF && err == NULL)
202 err = got_error_from_errno("fclose");
203 if (fd != -1 && close(fd) == -1 && err == NULL)
204 err = got_error_from_errno("close");
205 if (outfd != -1 && close(outfd) == -1 && err == NULL)
206 err = got_error_from_errno("close");
208 imsg_free(&imsg);
209 imsg_free(&imsg_outfd);
210 if (obj)
211 got_object_close(obj);
212 if (err)
213 break;
216 imsg_clear(&ibuf);
217 if (err) {
218 if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
219 fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
220 got_privsep_send_error(&ibuf, err);
223 if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
224 err = got_error_from_errno("close");
225 return err ? 1 : 0;