1 ad242220 2018-09-08 stsp /*
  2 ad242220 2018-09-08 stsp  * Copyright (c) 2018 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 ad242220 2018-09-08 stsp #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 ad242220 2018-09-08 stsp #include <imsg.h>
 24 12ce7a6c 2019-08-12 stsp #include <limits.h>
 25 99437157 2018-11-11 stsp #include <signal.h>
 26 ad242220 2018-09-08 stsp #include <stdio.h>
 27 ad242220 2018-09-08 stsp #include <stdlib.h>
 28 ad242220 2018-09-08 stsp #include <string.h>
 29 ad242220 2018-09-08 stsp #include <sha1.h>
 30 81a12da5 2020-09-09 naddy #include <unistd.h>
 31 ad242220 2018-09-08 stsp #include <zlib.h>
 32 ad242220 2018-09-08 stsp 
 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 1785f84a 2018-12-23 stsp #include "got_lib_object_parse.h"
 40 ad242220 2018-09-08 stsp #include "got_lib_privsep.h"
 41 ad242220 2018-09-08 stsp 
 42 ad242220 2018-09-08 stsp #ifndef nitems
 43 ad242220 2018-09-08 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
 44 ad242220 2018-09-08 stsp #endif
 45 ad242220 2018-09-08 stsp 
 46 ad242220 2018-09-08 stsp #define GOT_OBJ_TAG_COMMIT	"commit"
 47 ad242220 2018-09-08 stsp #define GOT_OBJ_TAG_TREE	"tree"
 48 ad242220 2018-09-08 stsp #define GOT_OBJ_TAG_BLOB	"blob"
 49 f4a881ce 2018-11-17 stsp #define GOT_OBJ_TAG_TAG		"tag"
 50 ad242220 2018-09-08 stsp 
 51 99437157 2018-11-11 stsp static volatile sig_atomic_t sigint_received;
 52 99437157 2018-11-11 stsp 
 53 99437157 2018-11-11 stsp static void
 54 99437157 2018-11-11 stsp catch_sigint(int signo)
 55 99437157 2018-11-11 stsp {
 56 99437157 2018-11-11 stsp 	sigint_received = 1;
 57 99437157 2018-11-11 stsp }
 58 99437157 2018-11-11 stsp 
 59 59d1e4a0 2021-03-10 stsp static const struct got_error *
 60 59d1e4a0 2021-03-10 stsp send_raw_obj(struct imsgbuf *ibuf, struct got_object *obj, int fd, int outfd)
 61 59d1e4a0 2021-03-10 stsp {
 62 59d1e4a0 2021-03-10 stsp 	const struct got_error *err = NULL;
 63 59d1e4a0 2021-03-10 stsp 	uint8_t *data = NULL;
 64 59d1e4a0 2021-03-10 stsp 	size_t len = 0, consumed;
 65 59d1e4a0 2021-03-10 stsp 	FILE *f;
 66 59d1e4a0 2021-03-10 stsp 
 67 59d1e4a0 2021-03-10 stsp 	if (lseek(fd, SEEK_SET, 0) == -1) {
 68 59d1e4a0 2021-03-10 stsp 		err = got_error_from_errno("lseek");
 69 59d1e4a0 2021-03-10 stsp 		close(fd);
 70 59d1e4a0 2021-03-10 stsp 		return err;
 71 59d1e4a0 2021-03-10 stsp 	}
 72 59d1e4a0 2021-03-10 stsp 
 73 59d1e4a0 2021-03-10 stsp 	f = fdopen(fd, "r");
 74 59d1e4a0 2021-03-10 stsp 	if (f == NULL) {
 75 59d1e4a0 2021-03-10 stsp 		err = got_error_from_errno("fdopen");
 76 59d1e4a0 2021-03-10 stsp 		close(fd);
 77 59d1e4a0 2021-03-10 stsp 		return err;
 78 59d1e4a0 2021-03-10 stsp 	}
 79 59d1e4a0 2021-03-10 stsp 
 80 59d1e4a0 2021-03-10 stsp 	if (obj->size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
 81 59d1e4a0 2021-03-10 stsp 		err = got_inflate_to_mem(&data, &len, &consumed, f);
 82 59d1e4a0 2021-03-10 stsp 	else
 83 59d1e4a0 2021-03-10 stsp 		err = got_inflate_to_fd(&len, f, outfd);
 84 59d1e4a0 2021-03-10 stsp 	if (err)
 85 59d1e4a0 2021-03-10 stsp 		goto done;
 86 59d1e4a0 2021-03-10 stsp 
 87 59d1e4a0 2021-03-10 stsp 	if (len < obj->hdrlen || len != obj->hdrlen + obj->size) {
 88 59d1e4a0 2021-03-10 stsp 		err = got_error(GOT_ERR_BAD_OBJ_HDR);
 89 59d1e4a0 2021-03-10 stsp 		goto done;
 90 59d1e4a0 2021-03-10 stsp 	}
 91 59d1e4a0 2021-03-10 stsp 
 92 59d1e4a0 2021-03-10 stsp 	err = got_privsep_send_raw_obj(ibuf, len, obj->hdrlen, data);
 93 59d1e4a0 2021-03-10 stsp done:
 94 59d1e4a0 2021-03-10 stsp 	free(data);
 95 59d1e4a0 2021-03-10 stsp 	if (fclose(f) == EOF && err == NULL)
 96 59d1e4a0 2021-03-10 stsp 		err = got_error_from_errno("fclose");
 97 59d1e4a0 2021-03-10 stsp 
 98 59d1e4a0 2021-03-10 stsp 	return err;
 99 59d1e4a0 2021-03-10 stsp }
100 59d1e4a0 2021-03-10 stsp 
101 ad242220 2018-09-08 stsp int
102 ad242220 2018-09-08 stsp main(int argc, char *argv[])
103 ad242220 2018-09-08 stsp {
104 ad242220 2018-09-08 stsp 	const struct got_error *err = NULL;
105 ad242220 2018-09-08 stsp 	struct got_object *obj = NULL;
106 ad242220 2018-09-08 stsp 	struct imsg imsg;
107 ad242220 2018-09-08 stsp 	struct imsgbuf ibuf;
108 ad242220 2018-09-08 stsp 	size_t datalen;
109 ad242220 2018-09-08 stsp 
110 99437157 2018-11-11 stsp 	signal(SIGINT, catch_sigint);
111 99437157 2018-11-11 stsp 
112 ad242220 2018-09-08 stsp 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
113 ad242220 2018-09-08 stsp 
114 2ff12563 2018-09-15 stsp #ifndef PROFILE
115 ad242220 2018-09-08 stsp 	/* revoke access to most system calls */
116 ad242220 2018-09-08 stsp 	if (pledge("stdio recvfd", NULL) == -1) {
117 638f9024 2019-05-13 stsp 		err = got_error_from_errno("pledge");
118 ad242220 2018-09-08 stsp 		got_privsep_send_error(&ibuf, err);
119 ad242220 2018-09-08 stsp 		return 1;
120 ad242220 2018-09-08 stsp 	}
121 2ff12563 2018-09-15 stsp #endif
122 ad242220 2018-09-08 stsp 
123 656b1f76 2019-05-11 jcs 	for (;;) {
124 99437157 2018-11-11 stsp 		if (sigint_received) {
125 99437157 2018-11-11 stsp 			err = got_error(GOT_ERR_CANCELLED);
126 99437157 2018-11-11 stsp 			break;
127 99437157 2018-11-11 stsp 		}
128 99437157 2018-11-11 stsp 
129 ad242220 2018-09-08 stsp 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
130 ad242220 2018-09-08 stsp 		if (err) {
131 876c234b 2018-09-10 stsp 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
132 ad242220 2018-09-08 stsp 				err = NULL;
133 ad242220 2018-09-08 stsp 			break;
134 ad242220 2018-09-08 stsp 		}
135 ad242220 2018-09-08 stsp 
136 ad242220 2018-09-08 stsp 		if (imsg.hdr.type == GOT_IMSG_STOP)
137 ad242220 2018-09-08 stsp 			break;
138 ad242220 2018-09-08 stsp 
139 59d1e4a0 2021-03-10 stsp 		if (imsg.hdr.type != GOT_IMSG_OBJECT_REQUEST &&
140 59d1e4a0 2021-03-10 stsp 		    imsg.hdr.type != GOT_IMSG_RAW_OBJECT_REQUEST) {
141 ad242220 2018-09-08 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
142 ad242220 2018-09-08 stsp 			goto done;
143 ad242220 2018-09-08 stsp 		}
144 ad242220 2018-09-08 stsp 
145 ad242220 2018-09-08 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
146 ad242220 2018-09-08 stsp 		if (datalen != 0) {
147 ad242220 2018-09-08 stsp 			err = got_error(GOT_ERR_PRIVSEP_LEN);
148 ad242220 2018-09-08 stsp 			goto done;
149 ad242220 2018-09-08 stsp 		}
150 ad242220 2018-09-08 stsp 
151 59d1e4a0 2021-03-10 stsp 		if (imsg.fd == -1) {
152 59d1e4a0 2021-03-10 stsp 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
153 59d1e4a0 2021-03-10 stsp 			goto done;
154 59d1e4a0 2021-03-10 stsp 		}
155 59d1e4a0 2021-03-10 stsp 
156 1785f84a 2018-12-23 stsp 		err = got_object_read_header(&obj, imsg.fd);
157 ad242220 2018-09-08 stsp 		if (err)
158 ad242220 2018-09-08 stsp 			goto done;
159 ad242220 2018-09-08 stsp 
160 59d1e4a0 2021-03-10 stsp 		if (imsg.hdr.type == GOT_IMSG_RAW_OBJECT_REQUEST) {
161 59d1e4a0 2021-03-10 stsp 			struct imsg imsg_outfd;
162 59d1e4a0 2021-03-10 stsp 			err = got_privsep_recv_imsg(&imsg_outfd, &ibuf, 0);
163 59d1e4a0 2021-03-10 stsp 			if (err) {
164 59d1e4a0 2021-03-10 stsp 				if (imsg_outfd.hdr.len == 0)
165 59d1e4a0 2021-03-10 stsp 					err = NULL;
166 59d1e4a0 2021-03-10 stsp 				goto done;
167 59d1e4a0 2021-03-10 stsp 			}
168 59d1e4a0 2021-03-10 stsp 
169 59d1e4a0 2021-03-10 stsp 			if (imsg_outfd.hdr.type == GOT_IMSG_STOP) {
170 59d1e4a0 2021-03-10 stsp 				imsg_free(&imsg_outfd);
171 59d1e4a0 2021-03-10 stsp 				goto done;
172 59d1e4a0 2021-03-10 stsp 			}
173 59d1e4a0 2021-03-10 stsp 
174 59d1e4a0 2021-03-10 stsp 			if (imsg_outfd.hdr.type != GOT_IMSG_RAW_OBJECT_OUTFD) {
175 59d1e4a0 2021-03-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
176 59d1e4a0 2021-03-10 stsp 				imsg_free(&imsg_outfd);
177 59d1e4a0 2021-03-10 stsp 				goto done;
178 59d1e4a0 2021-03-10 stsp 			}
179 59d1e4a0 2021-03-10 stsp 
180 59d1e4a0 2021-03-10 stsp 			datalen = imsg_outfd.hdr.len - IMSG_HEADER_SIZE;
181 59d1e4a0 2021-03-10 stsp 			if (datalen != 0) {
182 59d1e4a0 2021-03-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
183 59d1e4a0 2021-03-10 stsp 				imsg_free(&imsg_outfd);
184 59d1e4a0 2021-03-10 stsp 				goto done;
185 59d1e4a0 2021-03-10 stsp 			}
186 59d1e4a0 2021-03-10 stsp 			if (imsg_outfd.fd == -1) {
187 59d1e4a0 2021-03-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
188 59d1e4a0 2021-03-10 stsp 				imsg_free(&imsg_outfd);
189 59d1e4a0 2021-03-10 stsp 				goto done;
190 59d1e4a0 2021-03-10 stsp 			}
191 59d1e4a0 2021-03-10 stsp 			err = send_raw_obj(&ibuf, obj, imsg.fd, imsg_outfd.fd);
192 59d1e4a0 2021-03-10 stsp 			imsg.fd = -1; /* imsg.fd is owned by send_raw_obj() */
193 e5ad7365 2021-05-20 stsp 			if (close(imsg_outfd.fd) == -1 && err == NULL)
194 e5ad7365 2021-05-20 stsp 				err = got_error_from_errno("close");
195 59d1e4a0 2021-03-10 stsp 			imsg_free(&imsg_outfd);
196 59d1e4a0 2021-03-10 stsp 			if (err)
197 59d1e4a0 2021-03-10 stsp 				goto done;
198 59d1e4a0 2021-03-10 stsp 		} else
199 59d1e4a0 2021-03-10 stsp 			err = got_privsep_send_obj(&ibuf, obj);
200 ad242220 2018-09-08 stsp done:
201 59d1e4a0 2021-03-10 stsp 		if (imsg.fd != -1 && close(imsg.fd) == -1 && err == NULL)
202 638f9024 2019-05-13 stsp 			err = got_error_from_errno("close");
203 ad242220 2018-09-08 stsp 		imsg_free(&imsg);
204 ad242220 2018-09-08 stsp 		if (obj)
205 ad242220 2018-09-08 stsp 			got_object_close(obj);
206 99437157 2018-11-11 stsp 		if (err)
207 ad242220 2018-09-08 stsp 			break;
208 ad242220 2018-09-08 stsp 	}
209 ad242220 2018-09-08 stsp 
210 ad242220 2018-09-08 stsp 	imsg_clear(&ibuf);
211 99437157 2018-11-11 stsp 	if (err) {
212 80d5f134 2018-11-11 stsp 		if(!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
213 80d5f134 2018-11-11 stsp 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
214 99437157 2018-11-11 stsp 			got_privsep_send_error(&ibuf, err);
215 80d5f134 2018-11-11 stsp 		}
216 99437157 2018-11-11 stsp 	}
217 08578a35 2021-01-22 stsp 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
218 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
219 ad242220 2018-09-08 stsp 	return err ? 1 : 0;
220 ad242220 2018-09-08 stsp }