1 28714985 2018-11-17 stsp /*
  2 28714985 2018-11-17 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
  3 28714985 2018-11-17 stsp  *
  4 28714985 2018-11-17 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 28714985 2018-11-17 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 28714985 2018-11-17 stsp  * copyright notice and this permission notice appear in all copies.
  7 28714985 2018-11-17 stsp  *
  8 28714985 2018-11-17 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 28714985 2018-11-17 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 28714985 2018-11-17 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 28714985 2018-11-17 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 28714985 2018-11-17 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 28714985 2018-11-17 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 28714985 2018-11-17 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 28714985 2018-11-17 stsp  */
 16 28714985 2018-11-17 stsp 
 17 28714985 2018-11-17 stsp #include <sys/types.h>
 18 28714985 2018-11-17 stsp #include <sys/uio.h>
 19 28714985 2018-11-17 stsp #include <sys/time.h>
 20 28714985 2018-11-17 stsp 
 21 28714985 2018-11-17 stsp #include <stdint.h>
 22 12ce7a6c 2019-08-12 stsp #include <limits.h>
 23 28714985 2018-11-17 stsp #include <signal.h>
 24 28714985 2018-11-17 stsp #include <stdio.h>
 25 28714985 2018-11-17 stsp #include <stdlib.h>
 26 28714985 2018-11-17 stsp #include <string.h>
 27 81a12da5 2020-09-09 naddy #include <unistd.h>
 28 28714985 2018-11-17 stsp #include <zlib.h>
 29 28714985 2018-11-17 stsp 
 30 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 31 dd038bc6 2021-09-21 thomas.ad 
 32 28714985 2018-11-17 stsp #include "got_error.h"
 33 28714985 2018-11-17 stsp #include "got_object.h"
 34 28714985 2018-11-17 stsp 
 35 28714985 2018-11-17 stsp #include "got_lib_delta.h"
 36 28714985 2018-11-17 stsp #include "got_lib_inflate.h"
 37 28714985 2018-11-17 stsp #include "got_lib_object.h"
 38 28714985 2018-11-17 stsp #include "got_lib_object_parse.h"
 39 28714985 2018-11-17 stsp #include "got_lib_privsep.h"
 40 d5c81d44 2021-07-08 stsp #include "got_lib_sha1.h"
 41 28714985 2018-11-17 stsp 
 42 28714985 2018-11-17 stsp static volatile sig_atomic_t sigint_received;
 43 28714985 2018-11-17 stsp 
 44 28714985 2018-11-17 stsp static void
 45 28714985 2018-11-17 stsp catch_sigint(int signo)
 46 28714985 2018-11-17 stsp {
 47 28714985 2018-11-17 stsp 	sigint_received = 1;
 48 28714985 2018-11-17 stsp }
 49 28714985 2018-11-17 stsp 
 50 28714985 2018-11-17 stsp static const struct got_error *
 51 d5c81d44 2021-07-08 stsp read_tag_object(struct got_tag_object **tag, FILE *f,
 52 d5c81d44 2021-07-08 stsp     struct got_object_id *expected_id)
 53 28714985 2018-11-17 stsp {
 54 28714985 2018-11-17 stsp 	const struct got_error *err = NULL;
 55 d5c81d44 2021-07-08 stsp 	struct got_object *obj = NULL;
 56 28714985 2018-11-17 stsp 	size_t len;
 57 28714985 2018-11-17 stsp 	uint8_t *p;
 58 d5c81d44 2021-07-08 stsp 	struct got_inflate_checksum csum;
 59 d5c81d44 2021-07-08 stsp 	SHA1_CTX sha1_ctx;
 60 d5c81d44 2021-07-08 stsp 	struct got_object_id id;
 61 28714985 2018-11-17 stsp 
 62 d5c81d44 2021-07-08 stsp 	SHA1Init(&sha1_ctx);
 63 d5c81d44 2021-07-08 stsp 	memset(&csum, 0, sizeof(csum));
 64 d5c81d44 2021-07-08 stsp 	csum.output_sha1 = &sha1_ctx;
 65 d5c81d44 2021-07-08 stsp 
 66 d5c81d44 2021-07-08 stsp 	err = got_inflate_to_mem(&p, &len, NULL, &csum, f);
 67 28714985 2018-11-17 stsp 	if (err)
 68 28714985 2018-11-17 stsp 		return err;
 69 28714985 2018-11-17 stsp 
 70 d5c81d44 2021-07-08 stsp 	SHA1Final(id.sha1, &sha1_ctx);
 71 d5c81d44 2021-07-08 stsp 	if (memcmp(expected_id->sha1, id.sha1, SHA1_DIGEST_LENGTH) != 0) {
 72 d5c81d44 2021-07-08 stsp 		char buf[SHA1_DIGEST_STRING_LENGTH];
 73 d5c81d44 2021-07-08 stsp 		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
 74 d5c81d44 2021-07-08 stsp 		    "checksum failure for object %s",
 75 d5c81d44 2021-07-08 stsp 		    got_sha1_digest_to_str(expected_id->sha1, buf,
 76 d5c81d44 2021-07-08 stsp 		    sizeof(buf)));
 77 d5c81d44 2021-07-08 stsp 		goto done;
 78 d5c81d44 2021-07-08 stsp 	}
 79 d5c81d44 2021-07-08 stsp 
 80 268f7291 2018-12-24 stsp 	err = got_object_parse_header(&obj, p, len);
 81 268f7291 2018-12-24 stsp 	if (err)
 82 d5c81d44 2021-07-08 stsp 		goto done;
 83 268f7291 2018-12-24 stsp 
 84 28714985 2018-11-17 stsp 	if (len < obj->hdrlen + obj->size) {
 85 28714985 2018-11-17 stsp 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
 86 28714985 2018-11-17 stsp 		goto done;
 87 28714985 2018-11-17 stsp 	}
 88 28714985 2018-11-17 stsp 
 89 28714985 2018-11-17 stsp 	/* Skip object header. */
 90 28714985 2018-11-17 stsp 	len -= obj->hdrlen;
 91 28714985 2018-11-17 stsp 	err = got_object_parse_tag(tag, p + obj->hdrlen, len);
 92 28714985 2018-11-17 stsp done:
 93 268f7291 2018-12-24 stsp 	free(p);
 94 d5c81d44 2021-07-08 stsp 	if (obj)
 95 d5c81d44 2021-07-08 stsp 		got_object_close(obj);
 96 28714985 2018-11-17 stsp 	return err;
 97 28714985 2018-11-17 stsp }
 98 28714985 2018-11-17 stsp 
 99 28714985 2018-11-17 stsp int
100 28714985 2018-11-17 stsp main(int argc, char *argv[])
101 28714985 2018-11-17 stsp {
102 28714985 2018-11-17 stsp 	const struct got_error *err = NULL;
103 28714985 2018-11-17 stsp 	struct imsgbuf ibuf;
104 d5c81d44 2021-07-08 stsp 	size_t datalen;
105 28714985 2018-11-17 stsp 
106 28714985 2018-11-17 stsp 	signal(SIGINT, catch_sigint);
107 28714985 2018-11-17 stsp 
108 28714985 2018-11-17 stsp 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
109 28714985 2018-11-17 stsp 
110 28714985 2018-11-17 stsp #ifndef PROFILE
111 28714985 2018-11-17 stsp 	/* revoke access to most system calls */
112 28714985 2018-11-17 stsp 	if (pledge("stdio recvfd", NULL) == -1) {
113 638f9024 2019-05-13 stsp 		err = got_error_from_errno("pledge");
114 28714985 2018-11-17 stsp 		got_privsep_send_error(&ibuf, err);
115 28714985 2018-11-17 stsp 		return 1;
116 28714985 2018-11-17 stsp 	}
117 97799ccd 2022-02-06 thomas 
118 97799ccd 2022-02-06 thomas 	/* revoke fs access */
119 97799ccd 2022-02-06 thomas 	if (landlock_no_fs() == -1) {
120 97799ccd 2022-02-06 thomas 		err = got_error_from_errno("landlock_no_fs");
121 97799ccd 2022-02-06 thomas 		got_privsep_send_error(&ibuf, err);
122 97799ccd 2022-02-06 thomas 		return 1;
123 97799ccd 2022-02-06 thomas 	}
124 5d120ea8 2022-06-23 op 	if (cap_enter() == -1) {
125 5d120ea8 2022-06-23 op 		err = got_error_from_errno("cap_enter");
126 5d120ea8 2022-06-23 op 		got_privsep_send_error(&ibuf, err);
127 5d120ea8 2022-06-23 op 		return 1;
128 5d120ea8 2022-06-23 op 	}
129 28714985 2018-11-17 stsp #endif
130 28714985 2018-11-17 stsp 
131 656b1f76 2019-05-11 jcs 	for (;;) {
132 28714985 2018-11-17 stsp 		struct imsg imsg;
133 28714985 2018-11-17 stsp 		FILE *f = NULL;
134 268f7291 2018-12-24 stsp 		struct got_tag_object *tag = NULL;
135 d5c81d44 2021-07-08 stsp 		struct got_object_id expected_id;
136 28714985 2018-11-17 stsp 
137 28714985 2018-11-17 stsp 		if (sigint_received) {
138 28714985 2018-11-17 stsp 			err = got_error(GOT_ERR_CANCELLED);
139 28714985 2018-11-17 stsp 			break;
140 28714985 2018-11-17 stsp 		}
141 28714985 2018-11-17 stsp 
142 28714985 2018-11-17 stsp 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
143 28714985 2018-11-17 stsp 		if (err) {
144 28714985 2018-11-17 stsp 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
145 28714985 2018-11-17 stsp 				err = NULL;
146 28714985 2018-11-17 stsp 			break;
147 28714985 2018-11-17 stsp 		}
148 28714985 2018-11-17 stsp 
149 28714985 2018-11-17 stsp 		if (imsg.hdr.type == GOT_IMSG_STOP)
150 28714985 2018-11-17 stsp 			break;
151 28714985 2018-11-17 stsp 
152 28714985 2018-11-17 stsp 		if (imsg.hdr.type != GOT_IMSG_TAG_REQUEST) {
153 28714985 2018-11-17 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
154 28714985 2018-11-17 stsp 			goto done;
155 28714985 2018-11-17 stsp 		}
156 28714985 2018-11-17 stsp 
157 d5c81d44 2021-07-08 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
158 d5c81d44 2021-07-08 stsp 		if (datalen != sizeof(expected_id)) {
159 d5c81d44 2021-07-08 stsp 			err = got_error(GOT_ERR_PRIVSEP_LEN);
160 d5c81d44 2021-07-08 stsp 			goto done;
161 d5c81d44 2021-07-08 stsp 		}
162 d5c81d44 2021-07-08 stsp 		memcpy(&expected_id, imsg.data, sizeof(expected_id));
163 d5c81d44 2021-07-08 stsp 
164 28714985 2018-11-17 stsp 		if (imsg.fd == -1) {
165 28714985 2018-11-17 stsp 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
166 28714985 2018-11-17 stsp 			goto done;
167 28714985 2018-11-17 stsp 		}
168 28714985 2018-11-17 stsp 
169 28714985 2018-11-17 stsp 		/* Always assume file offset zero. */
170 28714985 2018-11-17 stsp 		f = fdopen(imsg.fd, "rb");
171 28714985 2018-11-17 stsp 		if (f == NULL) {
172 638f9024 2019-05-13 stsp 			err = got_error_from_errno("fdopen");
173 28714985 2018-11-17 stsp 			goto done;
174 28714985 2018-11-17 stsp 		}
175 28714985 2018-11-17 stsp 
176 d5c81d44 2021-07-08 stsp 		err = read_tag_object(&tag, f, &expected_id);
177 28714985 2018-11-17 stsp 		if (err)
178 28714985 2018-11-17 stsp 			goto done;
179 28714985 2018-11-17 stsp 
180 28714985 2018-11-17 stsp 		err = got_privsep_send_tag(&ibuf, tag);
181 28714985 2018-11-17 stsp done:
182 fb43ecf1 2019-02-11 stsp 		if (f) {
183 56b63ca4 2021-01-22 stsp 			if (fclose(f) == EOF && err == NULL)
184 638f9024 2019-05-13 stsp 				err = got_error_from_errno("fclose");
185 3a6ce05a 2019-02-11 stsp 		} else if (imsg.fd != -1) {
186 08578a35 2021-01-22 stsp 			if (close(imsg.fd) == -1 && err == NULL)
187 638f9024 2019-05-13 stsp 				err = got_error_from_errno("close");
188 3a6ce05a 2019-02-11 stsp 		}
189 28714985 2018-11-17 stsp 		imsg_free(&imsg);
190 28714985 2018-11-17 stsp 		if (err)
191 28714985 2018-11-17 stsp 			break;
192 28714985 2018-11-17 stsp 	}
193 28714985 2018-11-17 stsp 
194 28714985 2018-11-17 stsp 	imsg_clear(&ibuf);
195 28714985 2018-11-17 stsp 	if (err) {
196 28714985 2018-11-17 stsp 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
197 28714985 2018-11-17 stsp 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
198 28714985 2018-11-17 stsp 			got_privsep_send_error(&ibuf, err);
199 28714985 2018-11-17 stsp 		}
200 28714985 2018-11-17 stsp 	}
201 08578a35 2021-01-22 stsp 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
202 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
203 28714985 2018-11-17 stsp 	return err ? 1 : 0;
204 28714985 2018-11-17 stsp }