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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* pgp-info.c
* Provide info about PGP data.
*
* Copyright (c) 2005 Marko Kreen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* contrib/pgcrypto/pgp-info.c
*/
#include "postgres.h"
#include "mbuf.h"
#include "pgp.h"
#include "px.h"
static int
read_pubkey_keyid(PullFilter *pkt, uint8 *keyid_buf)
{
int res;
PGP_PubKey *pk = NULL;
res = _pgp_read_public_key(pkt, &pk);
if (res < 0)
goto err;
/* skip secret key part, if it exists */
res = pgp_skip_packet(pkt);
if (res < 0)
goto err;
/* is it encryption key */
switch (pk->algo)
{
case PGP_PUB_ELG_ENCRYPT:
case PGP_PUB_RSA_ENCRYPT:
case PGP_PUB_RSA_ENCRYPT_SIGN:
memcpy(keyid_buf, pk->key_id, 8);
res = 1;
break;
default:
res = 0;
}
err:
pgp_key_free(pk);
return res;
}
static int
read_pubenc_keyid(PullFilter *pkt, uint8 *keyid_buf)
{
uint8 ver;
int res;
GETBYTE(pkt, ver);
if (ver != 3)
return -1;
res = pullf_read_fixed(pkt, 8, keyid_buf);
if (res < 0)
return res;
return pgp_skip_packet(pkt);
}
static const char hextbl[] = "0123456789ABCDEF";
static int
print_key(uint8 *keyid, char *dst)
{
int i;
unsigned c;
for (i = 0; i < 8; i++)
{
c = keyid[i];
*dst++ = hextbl[(c >> 4) & 0x0F];
*dst++ = hextbl[c & 0x0F];
}
*dst = 0;
return 8 * 2;
}
static const uint8 any_key[] =
{0, 0, 0, 0, 0, 0, 0, 0};
/*
* dst should have room for 17 bytes
*/
int
pgp_get_keyid(MBuf *pgp_data, char *dst)
{
int res;
PullFilter *src;
PullFilter *pkt = NULL;
int len;
uint8 tag;
int got_pub_key = 0,
got_symenc_key = 0,
got_pubenc_key = 0;
int got_data = 0;
uint8 keyid_buf[8];
int got_main_key = 0;
res = pullf_create_mbuf_reader(&src, pgp_data);
if (res < 0)
return res;
while (1)
{
res = pgp_parse_pkt_hdr(src, &tag, &len, 0);
if (res <= 0)
break;
res = pgp_create_pkt_reader(&pkt, src, len, res, NULL);
if (res < 0)
break;
switch (tag)
{
case PGP_PKT_SECRET_KEY:
case PGP_PKT_PUBLIC_KEY:
/* main key is for signing, so ignore it */
if (!got_main_key)
{
got_main_key = 1;
res = pgp_skip_packet(pkt);
}
else
res = PXE_PGP_MULTIPLE_KEYS;
break;
case PGP_PKT_SECRET_SUBKEY:
case PGP_PKT_PUBLIC_SUBKEY:
res = read_pubkey_keyid(pkt, keyid_buf);
if (res < 0)
break;
if (res > 0)
got_pub_key++;
break;
case PGP_PKT_PUBENCRYPTED_SESSKEY:
got_pubenc_key++;
res = read_pubenc_keyid(pkt, keyid_buf);
break;
case PGP_PKT_SYMENCRYPTED_DATA:
case PGP_PKT_SYMENCRYPTED_DATA_MDC:
/* don't skip it, just stop */
got_data = 1;
break;
case PGP_PKT_SYMENCRYPTED_SESSKEY:
got_symenc_key++;
/* fall through */
case PGP_PKT_SIGNATURE:
case PGP_PKT_MARKER:
case PGP_PKT_TRUST:
case PGP_PKT_USER_ID:
case PGP_PKT_USER_ATTR:
case PGP_PKT_PRIV_61:
res = pgp_skip_packet(pkt);
break;
default:
res = PXE_PGP_CORRUPT_DATA;
}
if (pkt)
pullf_free(pkt);
pkt = NULL;
if (res < 0 || got_data)
break;
}
pullf_free(src);
if (pkt)
pullf_free(pkt);
if (res < 0)
return res;
/* now check sanity */
if (got_pub_key && got_pubenc_key)
res = PXE_PGP_CORRUPT_DATA;
if (got_pub_key > 1)
res = PXE_PGP_MULTIPLE_KEYS;
if (got_pubenc_key > 1)
res = PXE_PGP_MULTIPLE_KEYS;
/*
* if still ok, look what we got
*/
if (res >= 0)
{
if (got_pubenc_key || got_pub_key)
{
if (memcmp(keyid_buf, any_key, 8) == 0)
{
memcpy(dst, "ANYKEY", 7);
res = 6;
}
else
res = print_key(keyid_buf, dst);
}
else if (got_symenc_key)
{
memcpy(dst, "SYMKEY", 7);
res = 6;
}
else
res = PXE_PGP_NO_USABLE_KEY;
}
return res;
}
|
