1 /* $OpenBSD: ssh-pkcs11-client.c,v 1.7 2017/05/30 08:52:19 markus Exp $ */
3 * Copyright (c) 2010 Markus Friedl. All rights reserved.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 #include <sys/types.h>
23 #ifdef HAVE_SYS_TIME_H
24 # include <sys/time.h>
26 #include <sys/socket.h>
33 #include <openssl/rsa.h>
35 #include "pathnames.h"
43 #include "ssh-pkcs11.h"
45 /* borrows code from sftp-server and ssh-agent */
54 int mlen
= buffer_len(m
);
57 if (atomicio(vwrite
, fd
, buf
, 4) != 4 ||
58 atomicio(vwrite
, fd
, buffer_ptr(m
),
59 buffer_len(m
)) != buffer_len(m
))
60 error("write to helper failed");
61 buffer_consume(m
, mlen
);
70 if ((len
= atomicio(read
, fd
, buf
, 4)) != 4) {
71 error("read from helper failed: %u", len
);
76 fatal("response too long: %u", len
);
77 /* read len bytes into m */
83 if (atomicio(read
, fd
, buf
, l
) != l
) {
84 error("response from helper failed.");
87 buffer_append(m
, buf
, l
);
90 return (buffer_get_char(m
));
94 pkcs11_init(int interactive
)
100 pkcs11_terminate(void)
106 pkcs11_rsa_private_encrypt(int flen
, const u_char
*from
, u_char
*to
, RSA
*rsa
,
109 struct sshkey key
; /* XXX */
110 u_char
*blob
, *signature
= NULL
;
111 u_int blen
, slen
= 0;
115 if (padding
!= RSA_PKCS1_PADDING
)
119 if (key_to_blob(&key
, &blob
, &blen
) == 0)
122 buffer_put_char(&msg
, SSH2_AGENTC_SIGN_REQUEST
);
123 buffer_put_string(&msg
, blob
, blen
);
124 buffer_put_string(&msg
, from
, flen
);
125 buffer_put_int(&msg
, 0);
130 if (recv_msg(&msg
) == SSH2_AGENT_SIGN_RESPONSE
) {
131 signature
= buffer_get_string(&msg
, &slen
);
132 if (slen
<= (u_int
)RSA_size(rsa
)) {
133 memcpy(to
, signature
, slen
);
142 /* redirect the private key encrypt operation to the ssh-pkcs11-helper */
146 static RSA_METHOD helper_rsa
;
148 memcpy(&helper_rsa
, RSA_get_default_method(), sizeof(helper_rsa
));
149 helper_rsa
.name
= "ssh-pkcs11-helper";
150 helper_rsa
.rsa_priv_enc
= pkcs11_rsa_private_encrypt
;
151 RSA_set_method(rsa
, &helper_rsa
);
156 pkcs11_start_helper(void)
160 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, pair
) == -1) {
161 error("socketpair: %s", strerror(errno
));
164 if ((pid
= fork()) == -1) {
165 error("fork: %s", strerror(errno
));
167 } else if (pid
== 0) {
168 if ((dup2(pair
[1], STDIN_FILENO
) == -1) ||
169 (dup2(pair
[1], STDOUT_FILENO
) == -1)) {
170 fprintf(stderr
, "dup2: %s\n", strerror(errno
));
175 execlp(_PATH_SSH_PKCS11_HELPER
, _PATH_SSH_PKCS11_HELPER
,
177 fprintf(stderr
, "exec: %s: %s\n", _PATH_SSH_PKCS11_HELPER
,
187 pkcs11_add_provider(char *name
, char *pin
, Key
***keysp
)
195 if (fd
< 0 && pkcs11_start_helper() < 0)
199 buffer_put_char(&msg
, SSH_AGENTC_ADD_SMARTCARD_KEY
);
200 buffer_put_cstring(&msg
, name
);
201 buffer_put_cstring(&msg
, pin
);
205 if (recv_msg(&msg
) == SSH2_AGENT_IDENTITIES_ANSWER
) {
206 nkeys
= buffer_get_int(&msg
);
207 *keysp
= xcalloc(nkeys
, sizeof(Key
*));
208 for (i
= 0; i
< nkeys
; i
++) {
209 blob
= buffer_get_string(&msg
, &blen
);
210 free(buffer_get_string(&msg
, NULL
));
211 k
= key_from_blob(blob
, blen
);
224 pkcs11_del_provider(char *name
)
230 buffer_put_char(&msg
, SSH_AGENTC_REMOVE_SMARTCARD_KEY
);
231 buffer_put_cstring(&msg
, name
);
232 buffer_put_cstring(&msg
, "");
236 if (recv_msg(&msg
) == SSH_AGENT_SUCCESS
)
242 #endif /* ENABLE_PKCS11 */