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
|
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <sys/stat.h>
#include "agent.h"
#include "../common/i18n.h"
#include "../common/sexp-parse.h"
int
divert_tpm2_pksign (ctrl_t ctrl, const char *desc_text,
const unsigned char *digest, size_t digestlen, int algo,
const unsigned char *shadow_info, unsigned char **r_sig,
size_t *r_siglen)
{
(void)desc_text;
(void)algo;
return agent_tpm2d_pksign(ctrl, digest, digestlen,
shadow_info, r_sig, r_siglen);
}
static gpg_error_t
agent_write_tpm2_shadow_key (ctrl_t ctrl, const unsigned char *grip,
unsigned char *shadow_info)
{
gpg_error_t err;
unsigned char *shdkey;
unsigned char *pkbuf;
size_t len;
gcry_sexp_t s_pkey;
err = agent_public_key_from_file (ctrl, grip, &s_pkey);
len = gcry_sexp_sprint(s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
pkbuf = xtrymalloc (len);
gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, pkbuf, len);
gcry_sexp_release (s_pkey);
err = agent_shadow_key_type (pkbuf, shadow_info, "tpm2-v1", &shdkey);
xfree (pkbuf);
if (err)
{
log_error ("shadowing the key failed: %s\n", gpg_strerror (err));
return err;
}
len = gcry_sexp_canon_len (shdkey, 0, NULL, NULL);
err = agent_write_private_key (grip, shdkey, len, 1 /*force*/,
NULL, NULL, 0);
xfree (shdkey);
if (err)
log_error ("error writing key: %s\n", gpg_strerror (err));
return err;
}
int
divert_tpm2_writekey (ctrl_t ctrl, const unsigned char *grip,
gcry_sexp_t s_skey)
{
int ret;
/* shadow_info is always shielded so no special handling required */
unsigned char *shadow_info;
ret = agent_tpm2d_writekey(ctrl, &shadow_info, s_skey);
if (!ret) {
ret = agent_write_tpm2_shadow_key (ctrl, grip, shadow_info);
xfree (shadow_info);
}
return ret;
}
int
divert_tpm2_pkdecrypt (ctrl_t ctrl, const char *desc_text,
const unsigned char *cipher,
const unsigned char *shadow_info,
char **r_buf, size_t *r_len, int *r_padding)
{
const unsigned char *s;
size_t n;
*r_padding = -1;
(void)desc_text;
s = cipher;
if (*s != '(')
return gpg_error (GPG_ERR_INV_SEXP);
s++;
n = snext (&s);
if (!n)
return gpg_error (GPG_ERR_INV_SEXP);
if (!smatch (&s, n, "enc-val"))
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
if (*s != '(')
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
s++;
n = snext (&s);
if (!n)
return gpg_error (GPG_ERR_INV_SEXP);
if (smatch (&s, n, "rsa"))
{
*r_padding = 0;
if (*s != '(')
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
s++;
n = snext (&s);
if (!n)
return gpg_error (GPG_ERR_INV_SEXP);
if (!smatch (&s, n, "a"))
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
n = snext (&s);
}
else if (smatch (&s, n, "ecdh"))
{
if (*s != '(')
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
s++;
n = snext (&s);
if (!n)
return gpg_error (GPG_ERR_INV_SEXP);
if (smatch (&s, n, "s"))
{
n = snext (&s);
s += n;
if (*s++ != ')')
return gpg_error (GPG_ERR_INV_SEXP);
if (*s++ != '(')
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
n = snext (&s);
if (!n)
return gpg_error (GPG_ERR_INV_SEXP);
}
if (!smatch (&s, n, "e"))
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
n = snext (&s);
}
else
return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
return agent_tpm2d_pkdecrypt (ctrl, s, n, shadow_info, r_buf, r_len);
}
|
