1 /* $OpenBSD: ssh-pkcs11-client.c,v 1.19 2023/12/18 14:46:56 djm Exp $ */
2 /*
3 * Copyright (c) 2010 Markus Friedl. All rights reserved.
4 * Copyright (c) 2014 Pedro Martelletto. All rights reserved.
5 *
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.
9 *
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 USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include "includes.h"
20
21 #ifdef ENABLE_PKCS11
22
23 #include <sys/types.h>
24 #ifdef HAVE_SYS_TIME_H
25 # include <sys/time.h>
26 #endif
27 #include <sys/socket.h>
28
29 #include <stdarg.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <limits.h>
34
35 #include <openssl/ecdsa.h>
36 #include <openssl/rsa.h>
37
38 #include "pathnames.h"
39 #include "xmalloc.h"
40 #include "sshbuf.h"
41 #include "log.h"
42 #include "misc.h"
43 #include "sshkey.h"
44 #include "authfd.h"
45 #include "atomicio.h"
46 #include "ssh-pkcs11.h"
47 #include "ssherr.h"
48
49 #include "openbsd-compat/openssl-compat.h"
50
51 #if !defined(OPENSSL_HAS_ECC) || !defined(HAVE_EC_KEY_METHOD_NEW)
52 #define EC_KEY_METHOD void
53 #define EC_KEY void
54 #endif
55
56 /* borrows code from sftp-server and ssh-agent */
57
58 /*
59 * Maintain a list of ssh-pkcs11-helper subprocesses. These may be looked up
60 * by provider path or their unique EC/RSA METHOD pointers.
61 */
62 struct helper {
63 char *path;
64 pid_t pid;
65 int fd;
66 RSA_METHOD *rsa_meth;
67 EC_KEY_METHOD *ec_meth;
68 int (*rsa_finish)(RSA *rsa);
69 void (*ec_finish)(EC_KEY *key);
70 size_t nrsa, nec; /* number of active keys of each type */
71 };
72 static struct helper **helpers;
73 static size_t nhelpers;
74
75 static struct helper *
helper_by_provider(const char * path)76 helper_by_provider(const char *path)
77 {
78 size_t i;
79
80 for (i = 0; i < nhelpers; i++) {
81 if (helpers[i] == NULL || helpers[i]->path == NULL ||
82 helpers[i]->fd == -1)
83 continue;
84 if (strcmp(helpers[i]->path, path) == 0)
85 return helpers[i];
86 }
87 return NULL;
88 }
89
90 static struct helper *
helper_by_rsa(const RSA * rsa)91 helper_by_rsa(const RSA *rsa)
92 {
93 size_t i;
94 const RSA_METHOD *meth;
95
96 if ((meth = RSA_get_method(rsa)) == NULL)
97 return NULL;
98 for (i = 0; i < nhelpers; i++) {
99 if (helpers[i] != NULL && helpers[i]->rsa_meth == meth)
100 return helpers[i];
101 }
102 return NULL;
103
104 }
105
106 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
107 static struct helper *
helper_by_ec(const EC_KEY * ec)108 helper_by_ec(const EC_KEY *ec)
109 {
110 size_t i;
111 const EC_KEY_METHOD *meth;
112
113 if ((meth = EC_KEY_get_method(ec)) == NULL)
114 return NULL;
115 for (i = 0; i < nhelpers; i++) {
116 if (helpers[i] != NULL && helpers[i]->ec_meth == meth)
117 return helpers[i];
118 }
119 return NULL;
120
121 }
122 #endif /* defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW) */
123
124 static void
helper_free(struct helper * helper)125 helper_free(struct helper *helper)
126 {
127 size_t i;
128 int found = 0;
129
130 if (helper == NULL)
131 return;
132 if (helper->path == NULL || helper->ec_meth == NULL ||
133 helper->rsa_meth == NULL)
134 fatal_f("inconsistent helper");
135 debug3_f("free helper for provider %s", helper->path);
136 for (i = 0; i < nhelpers; i++) {
137 if (helpers[i] == helper) {
138 if (found)
139 fatal_f("helper recorded more than once");
140 found = 1;
141 }
142 else if (found)
143 helpers[i - 1] = helpers[i];
144 }
145 if (found) {
146 helpers = xrecallocarray(helpers, nhelpers,
147 nhelpers - 1, sizeof(*helpers));
148 nhelpers--;
149 }
150 free(helper->path);
151 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
152 EC_KEY_METHOD_free(helper->ec_meth);
153 #endif
154 RSA_meth_free(helper->rsa_meth);
155 free(helper);
156 }
157
158 static void
helper_terminate(struct helper * helper)159 helper_terminate(struct helper *helper)
160 {
161 if (helper == NULL) {
162 return;
163 } else if (helper->fd == -1) {
164 debug3_f("already terminated");
165 } else {
166 debug3_f("terminating helper for %s; "
167 "remaining %zu RSA %zu ECDSA",
168 helper->path, helper->nrsa, helper->nec);
169 close(helper->fd);
170 /* XXX waitpid() */
171 helper->fd = -1;
172 helper->pid = -1;
173 }
174 /*
175 * Don't delete the helper entry until there are no remaining keys
176 * that reference it. Otherwise, any signing operation would call
177 * a free'd METHOD pointer and that would be bad.
178 */
179 if (helper->nrsa == 0 && helper->nec == 0)
180 helper_free(helper);
181 }
182
183 static void
send_msg(int fd,struct sshbuf * m)184 send_msg(int fd, struct sshbuf *m)
185 {
186 u_char buf[4];
187 size_t mlen = sshbuf_len(m);
188 int r;
189
190 if (fd == -1)
191 return;
192 POKE_U32(buf, mlen);
193 if (atomicio(vwrite, fd, buf, 4) != 4 ||
194 atomicio(vwrite, fd, sshbuf_mutable_ptr(m),
195 sshbuf_len(m)) != sshbuf_len(m))
196 error("write to helper failed");
197 if ((r = sshbuf_consume(m, mlen)) != 0)
198 fatal_fr(r, "consume");
199 }
200
201 static int
recv_msg(int fd,struct sshbuf * m)202 recv_msg(int fd, struct sshbuf *m)
203 {
204 u_int l, len;
205 u_char c, buf[1024];
206 int r;
207
208 sshbuf_reset(m);
209 if (fd == -1)
210 return 0; /* XXX */
211 if ((len = atomicio(read, fd, buf, 4)) != 4) {
212 error("read from helper failed: %u", len);
213 return (0); /* XXX */
214 }
215 len = PEEK_U32(buf);
216 if (len > 256 * 1024)
217 fatal("response too long: %u", len);
218 /* read len bytes into m */
219 while (len > 0) {
220 l = len;
221 if (l > sizeof(buf))
222 l = sizeof(buf);
223 if (atomicio(read, fd, buf, l) != l) {
224 error("response from helper failed.");
225 return (0); /* XXX */
226 }
227 if ((r = sshbuf_put(m, buf, l)) != 0)
228 fatal_fr(r, "sshbuf_put");
229 len -= l;
230 }
231 if ((r = sshbuf_get_u8(m, &c)) != 0)
232 fatal_fr(r, "parse type");
233 return c;
234 }
235
236 int
pkcs11_init(int interactive)237 pkcs11_init(int interactive)
238 {
239 return 0;
240 }
241
242 void
pkcs11_terminate(void)243 pkcs11_terminate(void)
244 {
245 size_t i;
246
247 debug3_f("terminating %zu helpers", nhelpers);
248 for (i = 0; i < nhelpers; i++)
249 helper_terminate(helpers[i]);
250 }
251
252 static int
rsa_encrypt(int flen,const u_char * from,u_char * to,RSA * rsa,int padding)253 rsa_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa, int padding)
254 {
255 struct sshkey *key = NULL;
256 struct sshbuf *msg = NULL;
257 u_char *blob = NULL, *signature = NULL;
258 size_t blen, slen = 0;
259 int r, ret = -1;
260 struct helper *helper;
261
262 if ((helper = helper_by_rsa(rsa)) == NULL || helper->fd == -1)
263 fatal_f("no helper for PKCS11 key");
264 debug3_f("signing with PKCS11 provider %s", helper->path);
265 if (padding != RSA_PKCS1_PADDING)
266 goto fail;
267 key = sshkey_new(KEY_UNSPEC);
268 if (key == NULL) {
269 error_f("sshkey_new failed");
270 goto fail;
271 }
272 key->type = KEY_RSA;
273 RSA_up_ref(rsa);
274 key->rsa = rsa;
275 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) {
276 error_fr(r, "encode key");
277 goto fail;
278 }
279 if ((msg = sshbuf_new()) == NULL)
280 fatal_f("sshbuf_new failed");
281 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
282 (r = sshbuf_put_string(msg, blob, blen)) != 0 ||
283 (r = sshbuf_put_string(msg, from, flen)) != 0 ||
284 (r = sshbuf_put_u32(msg, 0)) != 0)
285 fatal_fr(r, "compose");
286 send_msg(helper->fd, msg);
287 sshbuf_reset(msg);
288
289 if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) {
290 if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0)
291 fatal_fr(r, "parse");
292 if (slen <= (size_t)RSA_size(rsa)) {
293 memcpy(to, signature, slen);
294 ret = slen;
295 }
296 free(signature);
297 }
298 fail:
299 free(blob);
300 sshkey_free(key);
301 sshbuf_free(msg);
302 return (ret);
303 }
304
305 static int
rsa_finish(RSA * rsa)306 rsa_finish(RSA *rsa)
307 {
308 struct helper *helper;
309
310 if ((helper = helper_by_rsa(rsa)) == NULL)
311 fatal_f("no helper for PKCS11 key");
312 debug3_f("free PKCS11 RSA key for provider %s", helper->path);
313 if (helper->rsa_finish != NULL)
314 helper->rsa_finish(rsa);
315 if (helper->nrsa == 0)
316 fatal_f("RSA refcount error");
317 helper->nrsa--;
318 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
319 helper->path, helper->nrsa, helper->nec);
320 if (helper->nrsa == 0 && helper->nec == 0)
321 helper_terminate(helper);
322 return 1;
323 }
324
325 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
326 static ECDSA_SIG *
ecdsa_do_sign(const unsigned char * dgst,int dgst_len,const BIGNUM * inv,const BIGNUM * rp,EC_KEY * ec)327 ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv,
328 const BIGNUM *rp, EC_KEY *ec)
329 {
330 struct sshkey *key = NULL;
331 struct sshbuf *msg = NULL;
332 ECDSA_SIG *ret = NULL;
333 const u_char *cp;
334 u_char *blob = NULL, *signature = NULL;
335 size_t blen, slen = 0;
336 int r, nid;
337 struct helper *helper;
338
339 if ((helper = helper_by_ec(ec)) == NULL || helper->fd == -1)
340 fatal_f("no helper for PKCS11 key");
341 debug3_f("signing with PKCS11 provider %s", helper->path);
342 nid = sshkey_ecdsa_key_to_nid(ec);
343 if (nid < 0) {
344 error_f("couldn't get curve nid");
345 goto fail;
346 }
347
348 key = sshkey_new(KEY_UNSPEC);
349 if (key == NULL) {
350 error_f("sshkey_new failed");
351 goto fail;
352 }
353 key->ecdsa = ec;
354 key->ecdsa_nid = nid;
355 key->type = KEY_ECDSA;
356 EC_KEY_up_ref(ec);
357
358 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) {
359 error_fr(r, "encode key");
360 goto fail;
361 }
362 if ((msg = sshbuf_new()) == NULL)
363 fatal_f("sshbuf_new failed");
364 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
365 (r = sshbuf_put_string(msg, blob, blen)) != 0 ||
366 (r = sshbuf_put_string(msg, dgst, dgst_len)) != 0 ||
367 (r = sshbuf_put_u32(msg, 0)) != 0)
368 fatal_fr(r, "compose");
369 send_msg(helper->fd, msg);
370 sshbuf_reset(msg);
371
372 if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) {
373 if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0)
374 fatal_fr(r, "parse");
375 cp = signature;
376 ret = d2i_ECDSA_SIG(NULL, &cp, slen);
377 free(signature);
378 }
379
380 fail:
381 free(blob);
382 sshkey_free(key);
383 sshbuf_free(msg);
384 return (ret);
385 }
386
387 static void
ecdsa_do_finish(EC_KEY * ec)388 ecdsa_do_finish(EC_KEY *ec)
389 {
390 struct helper *helper;
391
392 if ((helper = helper_by_ec(ec)) == NULL)
393 fatal_f("no helper for PKCS11 key");
394 debug3_f("free PKCS11 ECDSA key for provider %s", helper->path);
395 if (helper->ec_finish != NULL)
396 helper->ec_finish(ec);
397 if (helper->nec == 0)
398 fatal_f("ECDSA refcount error");
399 helper->nec--;
400 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
401 helper->path, helper->nrsa, helper->nec);
402 if (helper->nrsa == 0 && helper->nec == 0)
403 helper_terminate(helper);
404 }
405 #endif /* defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW) */
406
407 /* redirect private key crypto operations to the ssh-pkcs11-helper */
408 static void
wrap_key(struct helper * helper,struct sshkey * k)409 wrap_key(struct helper *helper, struct sshkey *k)
410 {
411 debug3_f("wrap %s for provider %s", sshkey_type(k), helper->path);
412 if (k->type == KEY_RSA) {
413 RSA_set_method(k->rsa, helper->rsa_meth);
414 if (helper->nrsa++ >= INT_MAX)
415 fatal_f("RSA refcount error");
416 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
417 } else if (k->type == KEY_ECDSA) {
418 EC_KEY_set_method(k->ecdsa, helper->ec_meth);
419 if (helper->nec++ >= INT_MAX)
420 fatal_f("EC refcount error");
421 #endif
422 } else
423 fatal_f("unknown key type");
424 k->flags |= SSHKEY_FLAG_EXT;
425 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
426 helper->path, helper->nrsa, helper->nec);
427 }
428
429 /*
430 * Make a private PKCS#11-backed certificate by grafting a previously-loaded
431 * PKCS#11 private key and a public certificate key.
432 */
433 int
pkcs11_make_cert(const struct sshkey * priv,const struct sshkey * certpub,struct sshkey ** certprivp)434 pkcs11_make_cert(const struct sshkey *priv,
435 const struct sshkey *certpub, struct sshkey **certprivp)
436 {
437 struct helper *helper = NULL;
438 struct sshkey *ret;
439 int r;
440
441 debug3_f("private key type %s cert type %s", sshkey_type(priv),
442 sshkey_type(certpub));
443 *certprivp = NULL;
444 if (!sshkey_is_cert(certpub) || sshkey_is_cert(priv) ||
445 !sshkey_equal_public(priv, certpub)) {
446 error_f("private key %s doesn't match cert %s",
447 sshkey_type(priv), sshkey_type(certpub));
448 return SSH_ERR_INVALID_ARGUMENT;
449 }
450 *certprivp = NULL;
451 if (priv->type == KEY_RSA) {
452 if ((helper = helper_by_rsa(priv->rsa)) == NULL ||
453 helper->fd == -1)
454 fatal_f("no helper for PKCS11 RSA key");
455 if ((r = sshkey_from_private(priv, &ret)) != 0)
456 fatal_fr(r, "copy key");
457 RSA_set_method(ret->rsa, helper->rsa_meth);
458 if (helper->nrsa++ >= INT_MAX)
459 fatal_f("RSA refcount error");
460 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
461 } else if (priv->type == KEY_ECDSA) {
462 if ((helper = helper_by_ec(priv->ecdsa)) == NULL ||
463 helper->fd == -1)
464 fatal_f("no helper for PKCS11 EC key");
465 if ((r = sshkey_from_private(priv, &ret)) != 0)
466 fatal_fr(r, "copy key");
467 EC_KEY_set_method(ret->ecdsa, helper->ec_meth);
468 if (helper->nec++ >= INT_MAX)
469 fatal_f("EC refcount error");
470 #endif
471 } else
472 fatal_f("unknown key type %s", sshkey_type(priv));
473
474 ret->flags |= SSHKEY_FLAG_EXT;
475 if ((r = sshkey_to_certified(ret)) != 0 ||
476 (r = sshkey_cert_copy(certpub, ret)) != 0)
477 fatal_fr(r, "graft certificate");
478 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
479 helper->path, helper->nrsa, helper->nec);
480 /* success */
481 *certprivp = ret;
482 return 0;
483 }
484
485 static int
pkcs11_start_helper_methods(struct helper * helper)486 pkcs11_start_helper_methods(struct helper *helper)
487 {
488 RSA_METHOD *rsa_meth;
489 EC_KEY_METHOD *ec_meth = NULL;
490 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
491 int (*ec_init)(EC_KEY *key);
492 int (*ec_copy)(EC_KEY *dest, const EC_KEY *src);
493 int (*ec_set_group)(EC_KEY *key, const EC_GROUP *grp);
494 int (*ec_set_private)(EC_KEY *key, const BIGNUM *priv_key);
495 int (*ec_set_public)(EC_KEY *key, const EC_POINT *pub_key);
496 int (*ec_sign)(int, const unsigned char *, int, unsigned char *,
497 unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
498
499 if ((ec_meth = EC_KEY_METHOD_new(EC_KEY_OpenSSL())) == NULL)
500 return -1;
501 EC_KEY_METHOD_get_sign(ec_meth, &ec_sign, NULL, NULL);
502 EC_KEY_METHOD_set_sign(ec_meth, ec_sign, NULL, ecdsa_do_sign);
503 EC_KEY_METHOD_get_init(ec_meth, &ec_init, &helper->ec_finish,
504 &ec_copy, &ec_set_group, &ec_set_private, &ec_set_public);
505 EC_KEY_METHOD_set_init(ec_meth, ec_init, ecdsa_do_finish,
506 ec_copy, ec_set_group, ec_set_private, ec_set_public);
507 #endif /* defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW) */
508
509 if ((rsa_meth = RSA_meth_dup(RSA_get_default_method())) == NULL)
510 fatal_f("RSA_meth_dup failed");
511 helper->rsa_finish = RSA_meth_get_finish(rsa_meth);
512 if (!RSA_meth_set1_name(rsa_meth, "ssh-pkcs11-helper") ||
513 !RSA_meth_set_priv_enc(rsa_meth, rsa_encrypt) ||
514 !RSA_meth_set_finish(rsa_meth, rsa_finish))
515 fatal_f("failed to prepare method");
516
517 helper->ec_meth = ec_meth;
518 helper->rsa_meth = rsa_meth;
519 return 0;
520 }
521
522 static struct helper *
pkcs11_start_helper(const char * path)523 pkcs11_start_helper(const char *path)
524 {
525 int pair[2];
526 char *prog, *verbosity = NULL;
527 struct helper *helper;
528 pid_t pid;
529
530 if (nhelpers >= INT_MAX)
531 fatal_f("too many helpers");
532 debug3_f("start helper for %s", path);
533 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) {
534 error_f("socketpair: %s", strerror(errno));
535 return NULL;
536 }
537 helper = xcalloc(1, sizeof(*helper));
538 if (pkcs11_start_helper_methods(helper) == -1) {
539 error_f("pkcs11_start_helper_methods failed");
540 goto fail;
541 }
542 if ((pid = fork()) == -1) {
543 error_f("fork: %s", strerror(errno));
544 fail:
545 close(pair[0]);
546 close(pair[1]);
547 RSA_meth_free(helper->rsa_meth);
548 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
549 EC_KEY_METHOD_free(helper->ec_meth);
550 #endif
551 free(helper);
552 return NULL;
553 } else if (pid == 0) {
554 if ((dup2(pair[1], STDIN_FILENO) == -1) ||
555 (dup2(pair[1], STDOUT_FILENO) == -1)) {
556 fprintf(stderr, "dup2: %s\n", strerror(errno));
557 _exit(1);
558 }
559 close(pair[0]);
560 close(pair[1]);
561 prog = getenv("SSH_PKCS11_HELPER");
562 if (prog == NULL || strlen(prog) == 0)
563 prog = _PATH_SSH_PKCS11_HELPER;
564 if (log_level_get() >= SYSLOG_LEVEL_DEBUG1)
565 verbosity = "-vvv";
566 debug_f("starting %s %s", prog,
567 verbosity == NULL ? "" : verbosity);
568 execlp(prog, prog, verbosity, (char *)NULL);
569 fprintf(stderr, "exec: %s: %s\n", prog, strerror(errno));
570 _exit(1);
571 }
572 close(pair[1]);
573 helper->fd = pair[0];
574 helper->path = xstrdup(path);
575 helper->pid = pid;
576 debug3_f("helper %zu for \"%s\" on fd %d pid %ld", nhelpers,
577 helper->path, helper->fd, (long)helper->pid);
578 helpers = xrecallocarray(helpers, nhelpers,
579 nhelpers + 1, sizeof(*helpers));
580 helpers[nhelpers++] = helper;
581 return helper;
582 }
583
584 int
pkcs11_add_provider(char * name,char * pin,struct sshkey *** keysp,char *** labelsp)585 pkcs11_add_provider(char *name, char *pin, struct sshkey ***keysp,
586 char ***labelsp)
587 {
588 struct sshkey *k;
589 int r, type;
590 u_char *blob;
591 char *label;
592 size_t blen;
593 u_int nkeys, i;
594 struct sshbuf *msg;
595 struct helper *helper;
596
597 if ((helper = helper_by_provider(name)) == NULL &&
598 (helper = pkcs11_start_helper(name)) == NULL)
599 return -1;
600
601 if ((msg = sshbuf_new()) == NULL)
602 fatal_f("sshbuf_new failed");
603 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_ADD_SMARTCARD_KEY)) != 0 ||
604 (r = sshbuf_put_cstring(msg, name)) != 0 ||
605 (r = sshbuf_put_cstring(msg, pin)) != 0)
606 fatal_fr(r, "compose");
607 send_msg(helper->fd, msg);
608 sshbuf_reset(msg);
609
610 type = recv_msg(helper->fd, msg);
611 if (type == SSH2_AGENT_IDENTITIES_ANSWER) {
612 if ((r = sshbuf_get_u32(msg, &nkeys)) != 0)
613 fatal_fr(r, "parse nkeys");
614 *keysp = xcalloc(nkeys, sizeof(struct sshkey *));
615 if (labelsp)
616 *labelsp = xcalloc(nkeys, sizeof(char *));
617 for (i = 0; i < nkeys; i++) {
618 /* XXX clean up properly instead of fatal() */
619 if ((r = sshbuf_get_string(msg, &blob, &blen)) != 0 ||
620 (r = sshbuf_get_cstring(msg, &label, NULL)) != 0)
621 fatal_fr(r, "parse key");
622 if ((r = sshkey_from_blob(blob, blen, &k)) != 0)
623 fatal_fr(r, "decode key");
624 wrap_key(helper, k);
625 (*keysp)[i] = k;
626 if (labelsp)
627 (*labelsp)[i] = label;
628 else
629 free(label);
630 free(blob);
631 }
632 } else if (type == SSH2_AGENT_FAILURE) {
633 if ((r = sshbuf_get_u32(msg, &nkeys)) != 0)
634 nkeys = -1;
635 } else {
636 nkeys = -1;
637 }
638 sshbuf_free(msg);
639 return (nkeys);
640 }
641
642 int
pkcs11_del_provider(char * name)643 pkcs11_del_provider(char *name)
644 {
645 struct helper *helper;
646
647 /*
648 * ssh-agent deletes keys before calling this, so the helper entry
649 * should be gone before we get here.
650 */
651 debug3_f("delete %s", name);
652 if ((helper = helper_by_provider(name)) != NULL)
653 helper_terminate(helper);
654 return 0;
655 }
656 #endif /* ENABLE_PKCS11 */
657