1 /* $OpenBSD: privsep.c,v 1.7 2004/05/10 18:34:42 deraadt Exp $ */
4 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
15 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
16 * OF OR IN CONNECTION WITH THE USE, ABUSE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/cdefs.h>
20 __FBSDID("$FreeBSD$");
30 if ((buf = calloc(1, sizeof(struct buf))) == NULL)
32 if ((buf->buf = malloc(len)) == NULL) {
42 buf_add(struct buf *buf, void *data, size_t len)
44 if (buf->wpos + len > buf->size)
47 memcpy(buf->buf + buf->wpos, data, len);
53 buf_close(int sock, struct buf *buf)
58 n = write(sock, buf->buf + buf->rpos, buf->size - buf->rpos);
61 if (n == 0) { /* connection closed */
65 } while (n == -1 && (errno == EAGAIN || errno == EINTR));
67 if (buf->rpos < buf->size)
68 error("short write: wanted %lu got %ld bytes",
69 (unsigned long)buf->size, (long)buf->rpos);
77 buf_read(int sock, void *buf, size_t nbytes)
83 n = read(sock, p, nbytes);
85 error("connection closed");
91 } while (n == -1 && (errno == EINTR || errno == EAGAIN));
94 error("buf_read: %m");
97 error("short read: wanted %lu got %ld bytes",
98 (unsigned long)nbytes, (long)r);
104 dispatch_imsg(struct interface_info *ifi, int fd)
107 char *medium, *reason, *filename,
108 *servername, *prefix;
109 size_t medium_len, reason_len, filename_len,
110 servername_len, prefix_len, totlen;
111 struct client_lease lease;
116 buf_read(fd, &hdr, sizeof(hdr));
119 case IMSG_SCRIPT_INIT:
120 if (hdr.len < sizeof(hdr) + sizeof(size_t))
121 error("corrupted message received");
122 buf_read(fd, &medium_len, sizeof(medium_len));
123 if (hdr.len < medium_len + sizeof(size_t) + sizeof(hdr)
124 + sizeof(size_t) || medium_len == SIZE_T_MAX)
125 error("corrupted message received");
126 if (medium_len > 0) {
127 if ((medium = calloc(1, medium_len + 1)) == NULL)
129 buf_read(fd, medium, medium_len);
133 buf_read(fd, &reason_len, sizeof(reason_len));
134 if (hdr.len < medium_len + reason_len + sizeof(hdr) ||
135 reason_len == SIZE_T_MAX)
136 error("corrupted message received");
137 if (reason_len > 0) {
138 if ((reason = calloc(1, reason_len + 1)) == NULL)
140 buf_read(fd, reason, reason_len);
144 priv_script_init(reason, medium);
148 case IMSG_SCRIPT_WRITE_PARAMS:
149 bzero(&lease, sizeof lease);
150 totlen = sizeof(hdr) + sizeof(lease) + sizeof(size_t);
151 if (hdr.len < totlen)
152 error("corrupted message received");
153 buf_read(fd, &lease, sizeof(lease));
155 buf_read(fd, &filename_len, sizeof(filename_len));
156 totlen += filename_len + sizeof(size_t);
157 if (hdr.len < totlen || filename_len == SIZE_T_MAX)
158 error("corrupted message received");
159 if (filename_len > 0) {
160 if ((filename = calloc(1, filename_len + 1)) == NULL)
162 buf_read(fd, filename, filename_len);
166 buf_read(fd, &servername_len, sizeof(servername_len));
167 totlen += servername_len + sizeof(size_t);
168 if (hdr.len < totlen || servername_len == SIZE_T_MAX)
169 error("corrupted message received");
170 if (servername_len > 0) {
172 calloc(1, servername_len + 1)) == NULL)
174 buf_read(fd, servername, servername_len);
178 buf_read(fd, &prefix_len, sizeof(prefix_len));
179 totlen += prefix_len;
180 if (hdr.len < totlen || prefix_len == SIZE_T_MAX)
181 error("corrupted message received");
182 if (prefix_len > 0) {
183 if ((prefix = calloc(1, prefix_len + 1)) == NULL)
185 buf_read(fd, prefix, prefix_len);
189 for (i = 0; i < 256; i++) {
190 totlen += sizeof(optlen);
191 if (hdr.len < totlen)
192 error("corrupted message received");
193 buf_read(fd, &optlen, sizeof(optlen));
194 lease.options[i].data = NULL;
195 lease.options[i].len = optlen;
198 if (hdr.len < totlen || optlen == SIZE_T_MAX)
199 error("corrupted message received");
200 lease.options[i].data =
201 calloc(1, optlen + 1);
202 if (lease.options[i].data == NULL)
204 buf_read(fd, lease.options[i].data, optlen);
207 lease.server_name = servername;
208 lease.filename = filename;
210 priv_script_write_params(prefix, &lease);
215 for (i = 0; i < 256; i++)
216 if (lease.options[i].len > 0)
217 free(lease.options[i].data);
220 if (hdr.len != sizeof(hdr))
221 error("corrupted message received");
223 ret = priv_script_go();
225 hdr.code = IMSG_SCRIPT_GO_RET;
226 hdr.len = sizeof(struct imsg_hdr) + sizeof(int);
227 if ((buf = buf_open(hdr.len)) == NULL)
228 error("buf_open: %m");
229 if (buf_add(buf, &hdr, sizeof(hdr)))
230 error("buf_add: %m");
231 if (buf_add(buf, &ret, sizeof(ret)))
232 error("buf_add: %m");
233 if (buf_close(fd, buf) == -1)
234 error("buf_close: %m");
236 case IMSG_SEND_PACKET:
237 send_packet_priv(ifi, &hdr, fd);
239 case IMSG_SET_INTERFACE_MTU:
240 if (hdr.len < sizeof(hdr) + sizeof(u_int16_t))
241 error("corrupted message received");
243 buf_read(fd, &mtu, sizeof(u_int16_t));
244 interface_set_mtu_priv(ifi->name, mtu);
247 error("received unknown message, code %d", hdr.code);