1 ad242220 2018-09-08 stsp /*
  2 5aa81393 2020-01-06 stsp  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
  3 ad242220 2018-09-08 stsp  *
  4 ad242220 2018-09-08 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 ad242220 2018-09-08 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 ad242220 2018-09-08 stsp  * copyright notice and this permission notice appear in all copies.
  7 ad242220 2018-09-08 stsp  *
  8 ad242220 2018-09-08 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 ad242220 2018-09-08 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 ad242220 2018-09-08 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 ad242220 2018-09-08 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 ad242220 2018-09-08 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 ad242220 2018-09-08 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 ad242220 2018-09-08 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 ad242220 2018-09-08 stsp  */
 16 ad242220 2018-09-08 stsp 
 17 ad242220 2018-09-08 stsp #include <sys/types.h>
 18 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 19 ad242220 2018-09-08 stsp #include <sys/uio.h>
 20 ad242220 2018-09-08 stsp #include <sys/time.h>
 21 ad242220 2018-09-08 stsp 
 22 ad242220 2018-09-08 stsp #include <stdint.h>
 23 12ce7a6c 2019-08-12 stsp #include <limits.h>
 24 99437157 2018-11-11 stsp #include <signal.h>
 25 ad242220 2018-09-08 stsp #include <stdio.h>
 26 ad242220 2018-09-08 stsp #include <stdlib.h>
 27 ad242220 2018-09-08 stsp #include <string.h>
 28 81a12da5 2020-09-09 naddy #include <unistd.h>
 29 ad242220 2018-09-08 stsp #include <zlib.h>
 30 ad242220 2018-09-08 stsp 
 31 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 32 dd038bc6 2021-09-21 thomas.ad 
 33 ad242220 2018-09-08 stsp #include "got_error.h"
 34 ad242220 2018-09-08 stsp #include "got_object.h"
 35 ad242220 2018-09-08 stsp 
 36 ad242220 2018-09-08 stsp #include "got_lib_delta.h"
 37 ad242220 2018-09-08 stsp #include "got_lib_inflate.h"
 38 ad242220 2018-09-08 stsp #include "got_lib_object.h"
 39 ad242220 2018-09-08 stsp #include "got_lib_object_parse.h"
 40 ad242220 2018-09-08 stsp #include "got_lib_privsep.h"
 41 d5c81d44 2021-07-08 stsp #include "got_lib_sha1.h"
 42 ad242220 2018-09-08 stsp 
 43 99437157 2018-11-11 stsp static volatile sig_atomic_t sigint_received;
 44 99437157 2018-11-11 stsp 
 45 99437157 2018-11-11 stsp static void
 46 99437157 2018-11-11 stsp catch_sigint(int signo)
 47 99437157 2018-11-11 stsp {
 48 99437157 2018-11-11 stsp 	sigint_received = 1;
 49 99437157 2018-11-11 stsp }
 50 99437157 2018-11-11 stsp 
 51 ad242220 2018-09-08 stsp static const struct got_error *
 52 d5c81d44 2021-07-08 stsp read_commit_object(struct got_commit_object **commit, FILE *f,
 53 d5c81d44 2021-07-08 stsp     struct got_object_id *expected_id)
 54 ad242220 2018-09-08 stsp {
 55 d5c81d44 2021-07-08 stsp 	struct got_object *obj = NULL;
 56 41fa1437 2018-11-05 stsp 	const struct got_error *err = NULL;
 57 41fa1437 2018-11-05 stsp 	size_t len;
 58 41fa1437 2018-11-05 stsp 	uint8_t *p;
 59 d5c81d44 2021-07-08 stsp 	struct got_inflate_checksum csum;
 60 d5c81d44 2021-07-08 stsp 	SHA1_CTX sha1_ctx;
 61 d5c81d44 2021-07-08 stsp 	struct got_object_id id;
 62 ad242220 2018-09-08 stsp 
 63 d5c81d44 2021-07-08 stsp 	SHA1Init(&sha1_ctx);
 64 d5c81d44 2021-07-08 stsp 	memset(&csum, 0, sizeof(csum));
 65 d5c81d44 2021-07-08 stsp 	csum.output_sha1 = &sha1_ctx;
 66 d5c81d44 2021-07-08 stsp 
 67 d5c81d44 2021-07-08 stsp 	err = got_inflate_to_mem(&p, &len, NULL, &csum, f);
 68 ad242220 2018-09-08 stsp 	if (err)
 69 ad242220 2018-09-08 stsp 		return err;
 70 ad242220 2018-09-08 stsp 
 71 d5c81d44 2021-07-08 stsp 	SHA1Final(id.sha1, &sha1_ctx);
 72 d5c81d44 2021-07-08 stsp 	if (memcmp(expected_id->sha1, id.sha1, SHA1_DIGEST_LENGTH) != 0) {
 73 d5c81d44 2021-07-08 stsp 		char buf[SHA1_DIGEST_STRING_LENGTH];
 74 d5c81d44 2021-07-08 stsp 		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
 75 d5c81d44 2021-07-08 stsp 		    "checksum failure for object %s",
 76 d5c81d44 2021-07-08 stsp 		    got_sha1_digest_to_str(expected_id->sha1, buf,
 77 d5c81d44 2021-07-08 stsp 		    sizeof(buf)));
 78 d5c81d44 2021-07-08 stsp 		goto done;
 79 3f7f9bd9 2020-01-06 stsp 	}
 80 1785f84a 2018-12-23 stsp 
 81 d5c81d44 2021-07-08 stsp 	err = got_object_parse_header(&obj, p, len);
 82 d5c81d44 2021-07-08 stsp 	if (err)
 83 d5c81d44 2021-07-08 stsp 		goto done;
 84 d5c81d44 2021-07-08 stsp 
 85 41fa1437 2018-11-05 stsp 	if (len < obj->hdrlen + obj->size) {
 86 41fa1437 2018-11-05 stsp 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
 87 41fa1437 2018-11-05 stsp 		goto done;
 88 ad242220 2018-09-08 stsp 	}
 89 ad242220 2018-09-08 stsp 
 90 1785f84a 2018-12-23 stsp 	if (obj->type != GOT_OBJ_TYPE_COMMIT) {
 91 1785f84a 2018-12-23 stsp 		err = got_error(GOT_ERR_OBJ_TYPE);
 92 1785f84a 2018-12-23 stsp 		goto done;
 93 1785f84a 2018-12-23 stsp 	}
 94 1785f84a 2018-12-23 stsp 
 95 ad242220 2018-09-08 stsp 	/* Skip object header. */
 96 41fa1437 2018-11-05 stsp 	len -= obj->hdrlen;
 97 ad242220 2018-09-08 stsp 	err = got_object_parse_commit(commit, p + obj->hdrlen, len);
 98 41fa1437 2018-11-05 stsp done:
 99 1785f84a 2018-12-23 stsp 	free(p);
100 d5c81d44 2021-07-08 stsp 	if (obj)
101 d5c81d44 2021-07-08 stsp 		got_object_close(obj);
102 ad242220 2018-09-08 stsp 	return err;
103 ad242220 2018-09-08 stsp }
104 ad242220 2018-09-08 stsp 
105 ad242220 2018-09-08 stsp int
106 ad242220 2018-09-08 stsp main(int argc, char *argv[])
107 ad242220 2018-09-08 stsp {
108 ad242220 2018-09-08 stsp 	const struct got_error *err = NULL;
109 ad242220 2018-09-08 stsp 	struct imsgbuf ibuf;
110 d5c81d44 2021-07-08 stsp 	size_t datalen;
111 ad242220 2018-09-08 stsp 
112 99437157 2018-11-11 stsp 	signal(SIGINT, catch_sigint);
113 99437157 2018-11-11 stsp 
114 ad242220 2018-09-08 stsp 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
115 ad242220 2018-09-08 stsp 
116 2ff12563 2018-09-15 stsp #ifndef PROFILE
117 ad242220 2018-09-08 stsp 	/* revoke access to most system calls */
118 ad242220 2018-09-08 stsp 	if (pledge("stdio recvfd", NULL) == -1) {
119 638f9024 2019-05-13 stsp 		err = got_error_from_errno("pledge");
120 ad242220 2018-09-08 stsp 		got_privsep_send_error(&ibuf, err);
121 ad242220 2018-09-08 stsp 		return 1;
122 ad242220 2018-09-08 stsp 	}
123 97799ccd 2022-02-06 thomas 
124 97799ccd 2022-02-06 thomas 	/* revoke fs access */
125 97799ccd 2022-02-06 thomas 	if (landlock_no_fs() == -1) {
126 97799ccd 2022-02-06 thomas 		err = got_error_from_errno("landlock_no_fs");
127 97799ccd 2022-02-06 thomas 		got_privsep_send_error(&ibuf, err);
128 97799ccd 2022-02-06 thomas 		return 1;
129 97799ccd 2022-02-06 thomas 	}
130 5d120ea8 2022-06-23 op 	if (cap_enter() == -1) {
131 5d120ea8 2022-06-23 op 		err = got_error_from_errno("cap_enter");
132 5d120ea8 2022-06-23 op 		got_privsep_send_error(&ibuf, err);
133 5d120ea8 2022-06-23 op 		return 1;
134 5d120ea8 2022-06-23 op 	}
135 2ff12563 2018-09-15 stsp #endif
136 ad242220 2018-09-08 stsp 
137 656b1f76 2019-05-11 jcs 	for (;;) {
138 ad242220 2018-09-08 stsp 		struct imsg imsg;
139 ad242220 2018-09-08 stsp 		FILE *f = NULL;
140 1785f84a 2018-12-23 stsp 		struct got_commit_object *commit = NULL;
141 d5c81d44 2021-07-08 stsp 		struct got_object_id expected_id;
142 99437157 2018-11-11 stsp 
143 99437157 2018-11-11 stsp 		if (sigint_received) {
144 99437157 2018-11-11 stsp 			err = got_error(GOT_ERR_CANCELLED);
145 99437157 2018-11-11 stsp 			break;
146 99437157 2018-11-11 stsp 		}
147 230a42bd 2019-05-11 jcs 
148 ad242220 2018-09-08 stsp 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
149 ad242220 2018-09-08 stsp 		if (err) {
150 876c234b 2018-09-10 stsp 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
151 ad242220 2018-09-08 stsp 				err = NULL;
152 ad242220 2018-09-08 stsp 			break;
153 ad242220 2018-09-08 stsp 		}
154 ad242220 2018-09-08 stsp 
155 ad242220 2018-09-08 stsp 		if (imsg.hdr.type == GOT_IMSG_STOP)
156 ad242220 2018-09-08 stsp 			break;
157 ad242220 2018-09-08 stsp 
158 41fa1437 2018-11-05 stsp 		if (imsg.hdr.type != GOT_IMSG_COMMIT_REQUEST) {
159 41fa1437 2018-11-05 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
160 41fa1437 2018-11-05 stsp 			goto done;
161 ad242220 2018-09-08 stsp 		}
162 ad242220 2018-09-08 stsp 
163 d5c81d44 2021-07-08 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
164 d5c81d44 2021-07-08 stsp 		if (datalen != sizeof(expected_id)) {
165 d5c81d44 2021-07-08 stsp 			err = got_error(GOT_ERR_PRIVSEP_LEN);
166 d5c81d44 2021-07-08 stsp 			goto done;
167 d5c81d44 2021-07-08 stsp 		}
168 d5c81d44 2021-07-08 stsp 		memcpy(&expected_id, imsg.data, sizeof(expected_id));
169 d5c81d44 2021-07-08 stsp 
170 ad242220 2018-09-08 stsp 		if (imsg.fd == -1) {
171 ad242220 2018-09-08 stsp 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
172 ad242220 2018-09-08 stsp 			goto done;
173 ad242220 2018-09-08 stsp 		}
174 ad242220 2018-09-08 stsp 
175 ad242220 2018-09-08 stsp 		/* Always assume file offset zero. */
176 ad242220 2018-09-08 stsp 		f = fdopen(imsg.fd, "rb");
177 ad242220 2018-09-08 stsp 		if (f == NULL) {
178 638f9024 2019-05-13 stsp 			err = got_error_from_errno("fdopen");
179 ad242220 2018-09-08 stsp 			goto done;
180 ad242220 2018-09-08 stsp 		}
181 ad242220 2018-09-08 stsp 
182 d5c81d44 2021-07-08 stsp 		err = read_commit_object(&commit, f, &expected_id);
183 41fa1437 2018-11-05 stsp 		if (err)
184 41fa1437 2018-11-05 stsp 			goto done;
185 41fa1437 2018-11-05 stsp 
186 41fa1437 2018-11-05 stsp 		err = got_privsep_send_commit(&ibuf, commit);
187 fe558a04 2020-01-06 stsp 		got_object_commit_close(commit);
188 ad242220 2018-09-08 stsp done:
189 fb43ecf1 2019-02-11 stsp 		if (f) {
190 56b63ca4 2021-01-22 stsp 			if (fclose(f) == EOF && err == NULL)
191 638f9024 2019-05-13 stsp 				err = got_error_from_errno("fclose");
192 3a6ce05a 2019-02-11 stsp 		} else if (imsg.fd != -1) {
193 08578a35 2021-01-22 stsp 			if (close(imsg.fd) == -1 && err == NULL)
194 638f9024 2019-05-13 stsp 				err = got_error_from_errno("close");
195 3a6ce05a 2019-02-11 stsp 		}
196 ad242220 2018-09-08 stsp 		imsg_free(&imsg);
197 99437157 2018-11-11 stsp 		if (err)
198 ad242220 2018-09-08 stsp 			break;
199 ad242220 2018-09-08 stsp 	}
200 ad242220 2018-09-08 stsp 
201 ad242220 2018-09-08 stsp 	imsg_clear(&ibuf);
202 99437157 2018-11-11 stsp 	if (err) {
203 80d5f134 2018-11-11 stsp 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
204 80d5f134 2018-11-11 stsp 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
205 99437157 2018-11-11 stsp 			got_privsep_send_error(&ibuf, err);
206 80d5f134 2018-11-11 stsp 		}
207 99437157 2018-11-11 stsp 	}
208 08578a35 2021-01-22 stsp 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
209 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
210 ad242220 2018-09-08 stsp 	return err ? 1 : 0;
211 ad242220 2018-09-08 stsp }