1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/* $Id: chngproc.c,v 1.12 2017/01/24 13:32:55 jsing Exp $ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int
chngproc(int netsock, const char *root)
{
char *tok = NULL, *th = NULL, *fmt = NULL, **fs = NULL;
size_t i, fsz = 0;
int rc = 0, fd = -1, cc;
long lval;
enum chngop op;
void *pp;
if (chroot(root) == -1) {
warn("chroot");
goto out;
}
if (chdir("/") == -1) {
warn("chdir");
goto out;
}
if (pledge("stdio cpath wpath", NULL) == -1) {
warn("pledge");
goto out;
}
/*
* Loop while we wait to get a thumbprint and token.
* We'll get this for each SAN request.
*/
for (;;) {
op = CHNG__MAX;
if ((lval = readop(netsock, COMM_CHNG_OP)) == 0)
op = CHNG_STOP;
else if (lval == CHNG_SYN)
op = lval;
if (op == CHNG__MAX) {
warnx("unknown operation from netproc");
goto out;
} else if (op == CHNG_STOP)
break;
assert(op == CHNG_SYN);
/*
* Read the thumbprint and token.
* The token is the filename, so store that in a vector
* of tokens that we'll later clean up.
*/
if ((th = readstr(netsock, COMM_THUMB)) == NULL)
goto out;
else if ((tok = readstr(netsock, COMM_TOK)) == NULL)
goto out;
/* Vector appending... */
pp = reallocarray(fs, (fsz + 1), sizeof(char *));
if (pp == NULL) {
warn("realloc");
goto out;
}
fs = pp;
fs[fsz] = tok;
tok = NULL;
fsz++;
if (asprintf(&fmt, "%s.%s", fs[fsz - 1], th) == -1) {
warn("asprintf");
goto out;
}
/*
* Create and write to our challenge file.
* Note: we use file descriptors instead of FILE
* because we want to minimise our pledges.
*/
fd = open(fs[fsz - 1], O_WRONLY|O_EXCL|O_CREAT, 0444);
if (fd == -1) {
warn("%s", fs[fsz - 1]);
goto out;
} if (write(fd, fmt, strlen(fmt)) == -1) {
warn("%s", fs[fsz - 1]);
goto out;
} else if (close(fd) == -1) {
warn("%s", fs[fsz - 1]);
goto out;
}
fd = -1;
free(th);
free(fmt);
th = fmt = NULL;
dodbg("%s/%s: created", root, fs[fsz - 1]);
/*
* Write our acknowledgement.
* Ignore reader failure.
*/
cc = writeop(netsock, COMM_CHNG_ACK, CHNG_ACK);
if (cc == 0)
break;
if (cc < 0)
goto out;
}
rc = 1;
out:
close(netsock);
if (fd != -1)
close(fd);
for (i = 0; i < fsz; i++) {
if (unlink(fs[i]) == -1 && errno != ENOENT)
warn("%s", fs[i]);
free(fs[i]);
}
free(fs);
free(fmt);
free(th);
free(tok);
return rc;
}
|
