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 #include <sys/syslimits.h>
23 
24 #include <stdint.h>
25 #include <imsg.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sha1.h>
30 #include <zlib.h>
31 
32 #include "got_error.h"
33 #include "got_object.h"
34 
35 #include "got_lib_delta.h"
36 #include "got_lib_inflate.h"
37 #include "got_lib_object.h"
38 #include "got_lib_object_parse.h"
39 #include "got_lib_privsep.h"
40 
41 static const struct got_error *
42 read_commit_object(struct got_commit_object **commit, struct got_object *obj,
43     FILE *f)
44 {
45 	const struct got_error *err = NULL;
46 	size_t len;
47 	uint8_t *p;
48 
49 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
50 		err = got_read_file_to_mem(&p, &len, f);
51 	else
52 		err = got_inflate_to_mem(&p, &len, f);
53 	if (err)
54 		return err;
55 
56 	if (len < obj->hdrlen + obj->size) {
57 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
58 		goto done;
59 	}
60 
61 	/* Skip object header. */
62 	len -= obj->hdrlen;
63 	err = got_object_parse_commit(commit, p + obj->hdrlen, len);
64 	free(p);
65 done:
66 	return err;
67 }
68 
69 int
70 main(int argc, char *argv[])
71 {
72 	const struct got_error *err = NULL;
73 	struct got_commit_object *commit = NULL;
74 	struct imsgbuf ibuf;
75 	size_t datalen;
76 
77 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
78 
79 	/* revoke access to most system calls */
80 	if (pledge("stdio recvfd", NULL) == -1) {
81 		err = got_error_from_errno();
82 		got_privsep_send_error(&ibuf, err);
83 		return 1;
84 	}
85 
86 	while (1) {
87 		struct imsg imsg;
88 		struct got_imsg_object iobj;
89 		FILE *f = NULL;
90 		struct got_object *obj = NULL;
91 	
92 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
93 		if (err) {
94 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
95 				err = NULL;
96 			break;
97 		}
98 
99 		if (imsg.hdr.type == GOT_IMSG_STOP)
100 			break;
101 
102 		if (imsg.hdr.type != GOT_IMSG_COMMIT_REQUEST) {
103 			err = got_error(GOT_ERR_PRIVSEP_MSG);
104 			goto done;
105 		}
106 
107 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
108 		if (datalen != sizeof(iobj)) {
109 			err = got_error(GOT_ERR_PRIVSEP_LEN);
110 			goto done;
111 		}
112 
113 		memcpy(&iobj, imsg.data, sizeof(iobj));
114 		if (iobj.type != GOT_OBJ_TYPE_COMMIT) {
115 			err = got_error(GOT_ERR_OBJ_TYPE);
116 			goto done;
117 		}
118 
119 		if (imsg.fd == -1) {
120 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
121 			goto done;
122 		}
123 
124 		obj = calloc(1, sizeof(*obj));
125 		if (obj == NULL) {
126 			err = got_error_from_errno();
127 			goto done;
128 		}
129 		obj->type = iobj.type;
130 		obj->hdrlen = iobj.hdrlen;
131 		obj->size = iobj.size;
132 
133 		/* Always assume file offset zero. */
134 		f = fdopen(imsg.fd, "rb");
135 		if (f == NULL) {
136 			err = got_error_from_errno();
137 			goto done;
138 		}
139 
140 		err = read_commit_object(&commit, obj, f);
141 		if (err)
142 			goto done;
143 
144 		err = got_privsep_send_commit(&ibuf, commit);
145 done:
146 		if (f)
147 			fclose(f);
148 		else if (imsg.fd != -1)
149 			close(imsg.fd);
150 		imsg_free(&imsg);
151 		if (obj)
152 			got_object_close(obj);
153 		if (err) {
154 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
155 				err = NULL;
156 			else
157 				got_privsep_send_error(&ibuf, err);
158 			break;
159 		}
160 	}
161 
162 	imsg_clear(&ibuf);
163 	if (err)
164 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
165 	close(GOT_IMSG_FD_CHILD);
166 	return err ? 1 : 0;
167 }