1 /*
2  * Copyright (c) 2018 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  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/limits.h>
22 
23 #include <stdint.h>
24 #include <imsg.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sha1.h>
29 #include <zlib.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 
34 #include "got_lib_delta.h"
35 #include "got_lib_inflate.h"
36 #include "got_lib_object.h"
37 #include "got_lib_object_parse.h"
38 #include "got_lib_privsep.h"
39 
40 static const struct got_error *
41 read_commit_object(struct got_commit_object **commit, struct got_object *obj,
42     FILE *f)
43 {
44 	const struct got_error *err = NULL;
45 	size_t len;
46 	uint8_t *p;
47 
48 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
49 		err = got_read_file_to_mem(&p, &len, f);
50 	else
51 		err = got_inflate_to_mem(&p, &len, f);
52 	if (err)
53 		return err;
54 
55 	if (len < obj->hdrlen + obj->size) {
56 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
57 		goto done;
58 	}
59 
60 	/* Skip object header. */
61 	len -= obj->hdrlen;
62 	err = got_object_parse_commit(commit, p + obj->hdrlen, len);
63 	free(p);
64 done:
65 	return err;
66 }
67 
68 int
69 main(int argc, char *argv[])
70 {
71 	const struct got_error *err = NULL;
72 	struct got_commit_object *commit = NULL;
73 	struct imsgbuf ibuf;
74 	size_t datalen;
75 
76 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
77 
78 	/* revoke access to most system calls */
79 	if (pledge("stdio recvfd", NULL) == -1) {
80 		err = got_error_from_errno();
81 		got_privsep_send_error(&ibuf, err);
82 		return 1;
83 	}
84 
85 	while (1) {
86 		struct imsg imsg;
87 		struct got_imsg_object iobj;
88 		FILE *f = NULL;
89 		struct got_object *obj = NULL;
90 	
91 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
92 		if (err) {
93 			if (imsg.hdr.len == 0)
94 				err = NULL;
95 			break;
96 		}
97 
98 		if (imsg.hdr.type == GOT_IMSG_STOP)
99 			break;
100 
101 		if (imsg.hdr.type != GOT_IMSG_COMMIT_REQUEST) {
102 			err = got_error(GOT_ERR_PRIVSEP_MSG);
103 			goto done;
104 		}
105 
106 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
107 		if (datalen != sizeof(iobj)) {
108 			err = got_error(GOT_ERR_PRIVSEP_LEN);
109 			goto done;
110 		}
111 
112 		memcpy(&iobj, imsg.data, sizeof(iobj));
113 		if (iobj.type != GOT_OBJ_TYPE_COMMIT) {
114 			err = got_error(GOT_ERR_OBJ_TYPE);
115 			goto done;
116 		}
117 
118 		if (imsg.fd == -1) {
119 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
120 			goto done;
121 		}
122 
123 		obj = calloc(1, sizeof(*obj));
124 		if (obj == NULL) {
125 			err = got_error_from_errno();
126 			goto done;
127 		}
128 		obj->type = iobj.type;
129 		obj->hdrlen = iobj.hdrlen;
130 		obj->size = iobj.size;
131 
132 		/* Always assume file offset zero. */
133 		f = fdopen(imsg.fd, "rb");
134 		if (f == NULL) {
135 			err = got_error_from_errno();
136 			goto done;
137 		}
138 
139 		err = read_commit_object(&commit, obj, f);
140 		if (err)
141 			goto done;
142 
143 		err = got_privsep_send_commit(&ibuf, commit);
144 done:
145 		if (f)
146 			fclose(f);
147 		else if (imsg.fd != -1)
148 			close(imsg.fd);
149 		imsg_free(&imsg);
150 		if (obj)
151 			got_object_close(obj);
152 		if (err) {
153 			got_privsep_send_error(&ibuf, err);
154 			break;
155 		}
156 	}
157 
158 	imsg_clear(&ibuf);
159 	if (err)
160 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
161 	close(GOT_IMSG_FD_CHILD);
162 	return err ? 1 : 0;
163 }