Annotation of src/usr.bin/ssh/sk-usbhid.c, Revision 1.30
1.30 ! djm 1: /* $OpenBSD: sk-usbhid.c,v 1.29 2021/02/18 02:15:07 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2019 Markus Friedl
1.22 djm 4: * Copyright (c) 2020 Pedro Martelletto
1.1 djm 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 <stdint.h>
20: #include <stdlib.h>
21: #include <string.h>
22: #include <stdio.h>
23: #include <stddef.h>
24: #include <stdarg.h>
1.17 djm 25: #include <sha2.h>
1.27 djm 26: #include <time.h>
1.1 djm 27:
1.7 naddy 28: #ifdef WITH_OPENSSL
1.1 djm 29: #include <openssl/opensslv.h>
30: #include <openssl/crypto.h>
31: #include <openssl/bn.h>
32: #include <openssl/ec.h>
33: #include <openssl/ecdsa.h>
1.17 djm 34: #include <openssl/evp.h>
1.7 naddy 35: #endif /* WITH_OPENSSL */
1.1 djm 36:
37: #include <fido.h>
1.9 djm 38: #include <fido/credman.h>
1.1 djm 39:
40: #ifndef SK_STANDALONE
1.15 djm 41: # include "log.h"
42: # include "xmalloc.h"
1.22 djm 43: # include "misc.h"
1.15 djm 44: /*
45: * If building as part of OpenSSH, then rename exported functions.
46: * This must be done before including sk-api.h.
47: */
48: # define sk_api_version ssh_sk_api_version
49: # define sk_enroll ssh_sk_enroll
50: # define sk_sign ssh_sk_sign
51: # define sk_load_resident_keys ssh_sk_load_resident_keys
52: #endif /* !SK_STANDALONE */
53:
54: #include "sk-api.h"
1.1 djm 55:
56: /* #define SK_DEBUG 1 */
57:
1.18 djm 58: #ifdef SK_DEBUG
59: #define SSH_FIDO_INIT_ARG FIDO_DEBUG
60: #else
61: #define SSH_FIDO_INIT_ARG 0
62: #endif
63:
1.22 djm 64: #define MAX_FIDO_DEVICES 8
65: #define FIDO_POLL_MS 50
66: #define SELECT_MS 15000
67: #define POLL_SLEEP_NS 200000000
1.1 djm 68:
69: /* Compatibility with OpenSSH 1.0.x */
70: #if (OPENSSL_VERSION_NUMBER < 0x10100000L)
71: #define ECDSA_SIG_get0(sig, pr, ps) \
72: do { \
73: (*pr) = sig->r; \
74: (*ps) = sig->s; \
75: } while (0)
76: #endif
77:
1.22 djm 78: struct sk_usbhid {
79: fido_dev_t *dev;
80: char *path;
81: };
82:
1.1 djm 83: /* Return the version of the middleware API */
84: uint32_t sk_api_version(void);
85:
86: /* Enroll a U2F key (private key generation) */
1.12 djm 87: int sk_enroll(uint32_t alg, const uint8_t *challenge, size_t challenge_len,
1.10 djm 88: const char *application, uint8_t flags, const char *pin,
1.12 djm 89: struct sk_option **options, struct sk_enroll_response **enroll_response);
1.1 djm 90:
91: /* Sign a challenge */
1.29 djm 92: int sk_sign(uint32_t alg, const uint8_t *data, size_t data_len,
1.1 djm 93: const char *application, const uint8_t *key_handle, size_t key_handle_len,
1.12 djm 94: uint8_t flags, const char *pin, struct sk_option **options,
95: struct sk_sign_response **sign_response);
1.1 djm 96:
1.9 djm 97: /* Load resident keys */
1.12 djm 98: int sk_load_resident_keys(const char *pin, struct sk_option **options,
1.9 djm 99: struct sk_resident_key ***rks, size_t *nrks);
100:
1.1 djm 101: static void skdebug(const char *func, const char *fmt, ...)
102: __attribute__((__format__ (printf, 2, 3)));
103:
104: static void
105: skdebug(const char *func, const char *fmt, ...)
106: {
107: #if !defined(SK_STANDALONE)
108: char *msg;
109: va_list ap;
110:
111: va_start(ap, fmt);
112: xvasprintf(&msg, fmt, ap);
113: va_end(ap);
1.2 djm 114: debug("%s: %s", func, msg);
1.1 djm 115: free(msg);
116: #elif defined(SK_DEBUG)
117: va_list ap;
118:
119: va_start(ap, fmt);
120: fprintf(stderr, "%s: ", func);
121: vfprintf(stderr, fmt, ap);
122: fputc('\n', stderr);
123: va_end(ap);
124: #else
125: (void)func; /* XXX */
126: (void)fmt; /* XXX */
127: #endif
128: }
129:
130: uint32_t
131: sk_api_version(void)
132: {
1.15 djm 133: return SSH_SK_VERSION_MAJOR;
1.1 djm 134: }
135:
1.22 djm 136: static struct sk_usbhid *
137: sk_open(const char *path)
138: {
139: struct sk_usbhid *sk;
1.1 djm 140: int r;
141:
1.22 djm 142: if (path == NULL) {
143: skdebug(__func__, "path == NULL");
144: return NULL;
145: }
146: if ((sk = calloc(1, sizeof(*sk))) == NULL) {
147: skdebug(__func__, "calloc sk failed");
148: return NULL;
149: }
150: if ((sk->path = strdup(path)) == NULL) {
151: skdebug(__func__, "strdup path failed");
152: free(sk);
153: return NULL;
154: }
155: if ((sk->dev = fido_dev_new()) == NULL) {
156: skdebug(__func__, "fido_dev_new failed");
157: free(sk->path);
158: free(sk);
159: return NULL;
1.1 djm 160: }
1.22 djm 161: if ((r = fido_dev_open(sk->dev, sk->path)) != FIDO_OK) {
162: skdebug(__func__, "fido_dev_open %s failed: %s", sk->path,
1.1 djm 163: fido_strerr(r));
1.22 djm 164: fido_dev_free(&sk->dev);
165: free(sk->path);
166: free(sk);
167: return NULL;
168: }
169: return sk;
170: }
171:
172: static void
173: sk_close(struct sk_usbhid *sk)
174: {
175: if (sk == NULL)
176: return;
177: fido_dev_cancel(sk->dev); /* cancel any pending operation */
178: fido_dev_close(sk->dev);
179: fido_dev_free(&sk->dev);
180: free(sk->path);
181: free(sk);
182: }
183:
184: static struct sk_usbhid **
185: sk_openv(const fido_dev_info_t *devlist, size_t ndevs, size_t *nopen)
186: {
187: const fido_dev_info_t *di;
188: struct sk_usbhid **skv;
189: size_t i;
190:
191: *nopen = 0;
192: if ((skv = calloc(ndevs, sizeof(*skv))) == NULL) {
193: skdebug(__func__, "calloc skv failed");
194: return NULL;
195: }
196: for (i = 0; i < ndevs; i++) {
197: if ((di = fido_dev_info_ptr(devlist, i)) == NULL)
198: skdebug(__func__, "fido_dev_info_ptr failed");
199: else if ((skv[*nopen] = sk_open(fido_dev_info_path(di))) == NULL)
200: skdebug(__func__, "sk_open failed");
201: else
202: (*nopen)++;
1.1 djm 203: }
1.22 djm 204: if (*nopen == 0) {
205: for (i = 0; i < ndevs; i++)
206: sk_close(skv[i]);
207: free(skv);
208: skv = NULL;
1.1 djm 209: }
1.22 djm 210:
211: return skv;
212: }
213:
214: static void
215: sk_closev(struct sk_usbhid **skv, size_t nsk)
216: {
217: size_t i;
218:
219: for (i = 0; i < nsk; i++)
220: sk_close(skv[i]);
221: free(skv);
222: }
223:
224: static int
225: sk_touch_begin(struct sk_usbhid **skv, size_t nsk)
226: {
227: size_t i, ok = 0;
228: int r;
229:
230: for (i = 0; i < nsk; i++)
231: if ((r = fido_dev_get_touch_begin(skv[i]->dev)) != FIDO_OK)
232: skdebug(__func__, "fido_dev_get_touch_begin %s failed:"
233: " %s", skv[i]->path, fido_strerr(r));
234: else
235: ok++;
236:
237: return ok ? 0 : -1;
238: }
239:
240: static int
241: sk_touch_poll(struct sk_usbhid **skv, size_t nsk, int *touch, size_t *idx)
242: {
243: struct timespec ts_pause;
244: size_t npoll, i;
245: int r;
246:
247: ts_pause.tv_sec = 0;
248: ts_pause.tv_nsec = POLL_SLEEP_NS;
249: nanosleep(&ts_pause, NULL);
250: npoll = nsk;
251: for (i = 0; i < nsk; i++) {
252: if (skv[i] == NULL)
253: continue; /* device discarded */
254: skdebug(__func__, "polling %s", skv[i]->path);
255: if ((r = fido_dev_get_touch_status(skv[i]->dev, touch,
256: FIDO_POLL_MS)) != FIDO_OK) {
257: skdebug(__func__, "fido_dev_get_touch_status %s: %s",
258: skv[i]->path, fido_strerr(r));
259: sk_close(skv[i]); /* discard device */
260: skv[i] = NULL;
261: if (--npoll == 0) {
262: skdebug(__func__, "no device left to poll");
263: return -1;
264: }
265: } else if (*touch) {
266: *idx = i;
267: return 0;
268: }
1.1 djm 269: }
1.22 djm 270: *touch = 0;
271: return 0;
272: }
273:
274: /* Calculate SHA256(m) */
275: static int
276: sha256_mem(const void *m, size_t mlen, u_char *d, size_t dlen)
277: {
278: #ifdef WITH_OPENSSL
279: u_int mdlen;
280: #endif
281:
282: if (dlen != 32)
283: return -1;
284: #ifdef WITH_OPENSSL
285: mdlen = dlen;
286: if (!EVP_Digest(m, mlen, d, &mdlen, EVP_sha256(), NULL))
287: return -1;
288: #else
289: SHA256Data(m, mlen, d);
290: #endif
291: return 0;
1.1 djm 292: }
293:
1.22 djm 294: /* Check if the specified key handle exists on a given sk. */
1.1 djm 295: static int
1.22 djm 296: sk_try(const struct sk_usbhid *sk, const char *application,
297: const uint8_t *key_handle, size_t key_handle_len)
1.1 djm 298: {
299: fido_assert_t *assert = NULL;
1.22 djm 300: /* generate an invalid signature on FIDO2 tokens */
301: const char *data = "";
302: uint8_t message[32];
1.1 djm 303: int r = FIDO_ERR_INTERNAL;
304:
1.22 djm 305: if (sha256_mem(data, strlen(data), message, sizeof(message)) != 0) {
306: skdebug(__func__, "hash message failed");
307: goto out;
308: }
1.1 djm 309: if ((assert = fido_assert_new()) == NULL) {
310: skdebug(__func__, "fido_assert_new failed");
311: goto out;
312: }
313: if ((r = fido_assert_set_clientdata_hash(assert, message,
1.22 djm 314: sizeof(message))) != FIDO_OK) {
1.1 djm 315: skdebug(__func__, "fido_assert_set_clientdata_hash: %s",
316: fido_strerr(r));
317: goto out;
318: }
319: if ((r = fido_assert_set_rp(assert, application)) != FIDO_OK) {
320: skdebug(__func__, "fido_assert_set_rp: %s", fido_strerr(r));
321: goto out;
322: }
323: if ((r = fido_assert_allow_cred(assert, key_handle,
324: key_handle_len)) != FIDO_OK) {
325: skdebug(__func__, "fido_assert_allow_cred: %s", fido_strerr(r));
326: goto out;
327: }
328: if ((r = fido_assert_set_up(assert, FIDO_OPT_FALSE)) != FIDO_OK) {
329: skdebug(__func__, "fido_assert_up: %s", fido_strerr(r));
330: goto out;
331: }
1.22 djm 332: r = fido_dev_get_assert(sk->dev, assert, NULL);
1.1 djm 333: skdebug(__func__, "fido_dev_get_assert: %s", fido_strerr(r));
1.3 djm 334: if (r == FIDO_ERR_USER_PRESENCE_REQUIRED) {
335: /* U2F tokens may return this */
336: r = FIDO_OK;
337: }
1.1 djm 338: out:
339: fido_assert_free(&assert);
340:
341: return r != FIDO_OK ? -1 : 0;
342: }
343:
1.22 djm 344: static struct sk_usbhid *
345: sk_select_by_cred(const fido_dev_info_t *devlist, size_t ndevs,
346: const char *application, const uint8_t *key_handle, size_t key_handle_len)
1.1 djm 347: {
1.22 djm 348: struct sk_usbhid **skv, *sk;
349: size_t skvcnt, i;
1.1 djm 350:
1.22 djm 351: if ((skv = sk_openv(devlist, ndevs, &skvcnt)) == NULL) {
352: skdebug(__func__, "sk_openv failed");
353: return NULL;
354: }
1.24 djm 355: if (skvcnt == 1) {
356: sk = skv[0];
357: skv[0] = NULL;
358: goto out;
359: }
1.22 djm 360: sk = NULL;
1.24 djm 361: for (i = 0; i < skvcnt; i++) {
1.22 djm 362: if (sk_try(skv[i], application, key_handle,
363: key_handle_len) == 0) {
364: sk = skv[i];
365: skv[i] = NULL;
366: skdebug(__func__, "found key in %s", sk->path);
367: break;
1.12 djm 368: }
1.24 djm 369: }
370: out:
1.22 djm 371: sk_closev(skv, skvcnt);
372: return sk;
373: }
374:
375: static struct sk_usbhid *
376: sk_select_by_touch(const fido_dev_info_t *devlist, size_t ndevs)
377: {
378: struct sk_usbhid **skv, *sk;
379: struct timeval tv_start, tv_now, tv_delta;
380: size_t skvcnt, idx;
381: int touch, ms_remain;
382:
383: if ((skv = sk_openv(devlist, ndevs, &skvcnt)) == NULL) {
384: skdebug(__func__, "sk_openv failed");
385: return NULL;
386: }
387: sk = NULL;
388: if (skvcnt < 2) {
389: if (skvcnt == 1) {
390: /* single candidate */
391: sk = skv[0];
392: skv[0] = NULL;
1.12 djm 393: }
1.22 djm 394: goto out;
1.12 djm 395: }
1.22 djm 396: if (sk_touch_begin(skv, skvcnt) == -1) {
397: skdebug(__func__, "sk_touch_begin failed");
398: goto out;
399: }
400: monotime_tv(&tv_start);
401: do {
402: if (sk_touch_poll(skv, skvcnt, &touch, &idx) == -1) {
403: skdebug(__func__, "sk_touch_poll failed");
404: goto out;
405: }
406: if (touch) {
407: sk = skv[idx];
408: skv[idx] = NULL;
409: goto out;
410: }
411: monotime_tv(&tv_now);
412: timersub(&tv_now, &tv_start, &tv_delta);
413: ms_remain = SELECT_MS - tv_delta.tv_sec * 1000 -
414: tv_delta.tv_usec / 1000;
415: } while (ms_remain >= FIDO_POLL_MS);
416: skdebug(__func__, "timeout");
417: out:
418: sk_closev(skv, skvcnt);
419: return sk;
420: }
421:
422: static struct sk_usbhid *
423: sk_probe(const char *application, const uint8_t *key_handle,
424: size_t key_handle_len)
425: {
426: struct sk_usbhid *sk;
427: fido_dev_info_t *devlist;
428: size_t ndevs;
429: int r;
1.12 djm 430:
1.1 djm 431: if ((devlist = fido_dev_info_new(MAX_FIDO_DEVICES)) == NULL) {
432: skdebug(__func__, "fido_dev_info_new failed");
1.22 djm 433: return NULL;
1.1 djm 434: }
435: if ((r = fido_dev_info_manifest(devlist, MAX_FIDO_DEVICES,
1.22 djm 436: &ndevs)) != FIDO_OK) {
437: skdebug(__func__, "fido_dev_info_manifest failed: %s",
438: fido_strerr(r));
439: fido_dev_info_free(&devlist, MAX_FIDO_DEVICES);
440: return NULL;
1.1 djm 441: }
1.22 djm 442: skdebug(__func__, "%zu device(s) detected", ndevs);
443: if (ndevs == 0) {
444: sk = NULL;
445: } else if (application != NULL && key_handle != NULL) {
446: skdebug(__func__, "selecting sk by cred");
447: sk = sk_select_by_cred(devlist, ndevs, application, key_handle,
448: key_handle_len);
449: } else {
450: skdebug(__func__, "selecting sk by touch");
451: sk = sk_select_by_touch(devlist, ndevs);
1.1 djm 452: }
1.22 djm 453: fido_dev_info_free(&devlist, MAX_FIDO_DEVICES);
454: return sk;
1.1 djm 455: }
456:
1.7 naddy 457: #ifdef WITH_OPENSSL
1.1 djm 458: /*
459: * The key returned via fido_cred_pubkey_ptr() is in affine coordinates,
460: * but the API expects a SEC1 octet string.
461: */
462: static int
1.9 djm 463: pack_public_key_ecdsa(const fido_cred_t *cred,
464: struct sk_enroll_response *response)
1.1 djm 465: {
466: const uint8_t *ptr;
467: BIGNUM *x = NULL, *y = NULL;
468: EC_POINT *q = NULL;
469: EC_GROUP *g = NULL;
470: int ret = -1;
471:
472: response->public_key = NULL;
473: response->public_key_len = 0;
474:
1.5 djm 475: if ((x = BN_new()) == NULL ||
476: (y = BN_new()) == NULL ||
1.1 djm 477: (g = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1)) == NULL ||
478: (q = EC_POINT_new(g)) == NULL) {
479: skdebug(__func__, "libcrypto setup failed");
480: goto out;
481: }
482: if ((ptr = fido_cred_pubkey_ptr(cred)) == NULL) {
483: skdebug(__func__, "fido_cred_pubkey_ptr failed");
484: goto out;
485: }
486: if (fido_cred_pubkey_len(cred) != 64) {
487: skdebug(__func__, "bad fido_cred_pubkey_len %zu",
488: fido_cred_pubkey_len(cred));
489: goto out;
490: }
491:
492: if (BN_bin2bn(ptr, 32, x) == NULL ||
493: BN_bin2bn(ptr + 32, 32, y) == NULL) {
494: skdebug(__func__, "BN_bin2bn failed");
495: goto out;
496: }
1.5 djm 497: if (EC_POINT_set_affine_coordinates_GFp(g, q, x, y, NULL) != 1) {
1.1 djm 498: skdebug(__func__, "EC_POINT_set_affine_coordinates_GFp failed");
499: goto out;
500: }
501: response->public_key_len = EC_POINT_point2oct(g, q,
1.5 djm 502: POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
1.1 djm 503: if (response->public_key_len == 0 || response->public_key_len > 2048) {
504: skdebug(__func__, "bad pubkey length %zu",
505: response->public_key_len);
506: goto out;
507: }
508: if ((response->public_key = malloc(response->public_key_len)) == NULL) {
509: skdebug(__func__, "malloc pubkey failed");
510: goto out;
511: }
512: if (EC_POINT_point2oct(g, q, POINT_CONVERSION_UNCOMPRESSED,
1.5 djm 513: response->public_key, response->public_key_len, NULL) == 0) {
1.1 djm 514: skdebug(__func__, "EC_POINT_point2oct failed");
515: goto out;
516: }
517: /* success */
518: ret = 0;
519: out:
520: if (ret != 0 && response->public_key != NULL) {
521: memset(response->public_key, 0, response->public_key_len);
522: free(response->public_key);
523: response->public_key = NULL;
524: }
525: EC_POINT_free(q);
526: EC_GROUP_free(g);
1.5 djm 527: BN_clear_free(x);
528: BN_clear_free(y);
1.1 djm 529: return ret;
530: }
1.7 naddy 531: #endif /* WITH_OPENSSL */
1.1 djm 532:
533: static int
1.9 djm 534: pack_public_key_ed25519(const fido_cred_t *cred,
535: struct sk_enroll_response *response)
1.1 djm 536: {
537: const uint8_t *ptr;
538: size_t len;
539: int ret = -1;
540:
541: response->public_key = NULL;
542: response->public_key_len = 0;
543:
544: if ((len = fido_cred_pubkey_len(cred)) != 32) {
545: skdebug(__func__, "bad fido_cred_pubkey_len len %zu", len);
546: goto out;
547: }
548: if ((ptr = fido_cred_pubkey_ptr(cred)) == NULL) {
549: skdebug(__func__, "fido_cred_pubkey_ptr failed");
550: goto out;
551: }
552: response->public_key_len = len;
553: if ((response->public_key = malloc(response->public_key_len)) == NULL) {
554: skdebug(__func__, "malloc pubkey failed");
555: goto out;
556: }
557: memcpy(response->public_key, ptr, len);
558: ret = 0;
559: out:
560: if (ret != 0)
561: free(response->public_key);
562: return ret;
563: }
564:
565: static int
1.12 djm 566: pack_public_key(uint32_t alg, const fido_cred_t *cred,
1.9 djm 567: struct sk_enroll_response *response)
1.1 djm 568: {
569: switch(alg) {
1.7 naddy 570: #ifdef WITH_OPENSSL
1.15 djm 571: case SSH_SK_ECDSA:
1.1 djm 572: return pack_public_key_ecdsa(cred, response);
1.7 naddy 573: #endif /* WITH_OPENSSL */
1.15 djm 574: case SSH_SK_ED25519:
1.1 djm 575: return pack_public_key_ed25519(cred, response);
576: default:
577: return -1;
578: }
579: }
580:
1.11 djm 581: static int
582: fidoerr_to_skerr(int fidoerr)
583: {
584: switch (fidoerr) {
585: case FIDO_ERR_UNSUPPORTED_OPTION:
1.15 djm 586: case FIDO_ERR_UNSUPPORTED_ALGORITHM:
1.11 djm 587: return SSH_SK_ERR_UNSUPPORTED;
588: case FIDO_ERR_PIN_REQUIRED:
589: case FIDO_ERR_PIN_INVALID:
590: return SSH_SK_ERR_PIN_REQUIRED;
591: default:
592: return -1;
593: }
594: }
595:
1.12 djm 596: static int
597: check_enroll_options(struct sk_option **options, char **devicep,
598: uint8_t *user_id, size_t user_id_len)
599: {
600: size_t i;
601:
602: if (options == NULL)
603: return 0;
604: for (i = 0; options[i] != NULL; i++) {
605: if (strcmp(options[i]->name, "device") == 0) {
606: if ((*devicep = strdup(options[i]->value)) == NULL) {
607: skdebug(__func__, "strdup device failed");
608: return -1;
609: }
610: skdebug(__func__, "requested device %s", *devicep);
1.14 djm 611: } else if (strcmp(options[i]->name, "user") == 0) {
1.12 djm 612: if (strlcpy(user_id, options[i]->value, user_id_len) >=
613: user_id_len) {
614: skdebug(__func__, "user too long");
615: return -1;
616: }
617: skdebug(__func__, "requested user %s",
618: (char *)user_id);
619: } else {
620: skdebug(__func__, "requested unsupported option %s",
621: options[i]->name);
622: if (options[i]->required) {
623: skdebug(__func__, "unknown required option");
624: return -1;
625: }
626: }
627: }
628: return 0;
629: }
630:
1.1 djm 631: int
1.12 djm 632: sk_enroll(uint32_t alg, const uint8_t *challenge, size_t challenge_len,
1.10 djm 633: const char *application, uint8_t flags, const char *pin,
1.12 djm 634: struct sk_option **options, struct sk_enroll_response **enroll_response)
1.1 djm 635: {
636: fido_cred_t *cred = NULL;
637: const uint8_t *ptr;
1.30 ! djm 638: uint8_t user_id[32], chall_hash[32];
1.22 djm 639: struct sk_usbhid *sk = NULL;
1.1 djm 640: struct sk_enroll_response *response = NULL;
641: size_t len;
1.19 djm 642: int credprot;
1.1 djm 643: int cose_alg;
1.11 djm 644: int ret = SSH_SK_ERR_GENERAL;
1.1 djm 645: int r;
646: char *device = NULL;
647:
1.18 djm 648: fido_init(SSH_FIDO_INIT_ARG);
649:
1.6 markus 650: if (enroll_response == NULL) {
651: skdebug(__func__, "enroll_response == NULL");
1.1 djm 652: goto out;
653: }
1.22 djm 654: *enroll_response = NULL;
1.12 djm 655: memset(user_id, 0, sizeof(user_id));
1.22 djm 656: if (check_enroll_options(options, &device, user_id,
657: sizeof(user_id)) != 0)
1.12 djm 658: goto out; /* error already logged */
659:
1.1 djm 660: switch(alg) {
1.7 naddy 661: #ifdef WITH_OPENSSL
1.15 djm 662: case SSH_SK_ECDSA:
1.1 djm 663: cose_alg = COSE_ES256;
664: break;
1.7 naddy 665: #endif /* WITH_OPENSSL */
1.15 djm 666: case SSH_SK_ED25519:
1.1 djm 667: cose_alg = COSE_EDDSA;
668: break;
669: default:
670: skdebug(__func__, "unsupported key type %d", alg);
671: goto out;
672: }
1.22 djm 673: if (device != NULL)
674: sk = sk_open(device);
675: else
676: sk = sk_probe(NULL, NULL, 0);
677: if (sk == NULL) {
678: skdebug(__func__, "failed to find sk");
1.1 djm 679: goto out;
680: }
1.22 djm 681: skdebug(__func__, "using device %s", sk->path);
1.1 djm 682: if ((cred = fido_cred_new()) == NULL) {
683: skdebug(__func__, "fido_cred_new failed");
684: goto out;
685: }
686: if ((r = fido_cred_set_type(cred, cose_alg)) != FIDO_OK) {
687: skdebug(__func__, "fido_cred_set_type: %s", fido_strerr(r));
688: goto out;
689: }
1.30 ! djm 690: if (sha256_mem(challenge, challenge_len,
! 691: chall_hash, sizeof(chall_hash)) != 0) {
! 692: skdebug(__func__, "hash challenge failed");
! 693: goto out;
! 694: }
! 695: if ((r = fido_cred_set_clientdata_hash(cred, chall_hash,
! 696: sizeof(chall_hash))) != FIDO_OK) {
1.1 djm 697: skdebug(__func__, "fido_cred_set_clientdata_hash: %s",
698: fido_strerr(r));
1.8 djm 699: goto out;
700: }
1.15 djm 701: if ((r = fido_cred_set_rk(cred, (flags & SSH_SK_RESIDENT_KEY) != 0 ?
1.8 djm 702: FIDO_OPT_TRUE : FIDO_OPT_OMIT)) != FIDO_OK) {
703: skdebug(__func__, "fido_cred_set_rk: %s", fido_strerr(r));
1.1 djm 704: goto out;
705: }
706: if ((r = fido_cred_set_user(cred, user_id, sizeof(user_id),
707: "openssh", "openssh", NULL)) != FIDO_OK) {
708: skdebug(__func__, "fido_cred_set_user: %s", fido_strerr(r));
709: goto out;
710: }
711: if ((r = fido_cred_set_rp(cred, application, NULL)) != FIDO_OK) {
712: skdebug(__func__, "fido_cred_set_rp: %s", fido_strerr(r));
713: goto out;
714: }
1.21 djm 715: if ((flags & (SSH_SK_RESIDENT_KEY|SSH_SK_USER_VERIFICATION_REQD)) != 0) {
1.22 djm 716: if (!fido_dev_supports_cred_prot(sk->dev)) {
717: skdebug(__func__, "%s does not support credprot, "
718: "refusing to create unprotected "
719: "resident/verify-required key", sk->path);
1.19 djm 720: ret = SSH_SK_ERR_UNSUPPORTED;
721: goto out;
722: }
1.21 djm 723: if ((flags & SSH_SK_USER_VERIFICATION_REQD))
724: credprot = FIDO_CRED_PROT_UV_REQUIRED;
725: else
726: credprot = FIDO_CRED_PROT_UV_OPTIONAL_WITH_ID;
727:
728: if ((r = fido_cred_set_prot(cred, credprot)) != FIDO_OK) {
1.19 djm 729: skdebug(__func__, "fido_cred_set_prot: %s",
730: fido_strerr(r));
731: ret = fidoerr_to_skerr(r);
732: goto out;
733: }
1.1 djm 734: }
1.22 djm 735: if ((r = fido_dev_make_cred(sk->dev, cred, pin)) != FIDO_OK) {
1.1 djm 736: skdebug(__func__, "fido_dev_make_cred: %s", fido_strerr(r));
1.11 djm 737: ret = fidoerr_to_skerr(r);
1.1 djm 738: goto out;
739: }
740: if (fido_cred_x5c_ptr(cred) != NULL) {
741: if ((r = fido_cred_verify(cred)) != FIDO_OK) {
742: skdebug(__func__, "fido_cred_verify: %s",
743: fido_strerr(r));
744: goto out;
745: }
746: } else {
747: skdebug(__func__, "self-attested credential");
748: if ((r = fido_cred_verify_self(cred)) != FIDO_OK) {
749: skdebug(__func__, "fido_cred_verify_self: %s",
750: fido_strerr(r));
751: goto out;
752: }
753: }
754: if ((response = calloc(1, sizeof(*response))) == NULL) {
755: skdebug(__func__, "calloc response failed");
756: goto out;
757: }
758: if (pack_public_key(alg, cred, response) != 0) {
759: skdebug(__func__, "pack_public_key failed");
760: goto out;
761: }
762: if ((ptr = fido_cred_id_ptr(cred)) != NULL) {
763: len = fido_cred_id_len(cred);
764: if ((response->key_handle = calloc(1, len)) == NULL) {
765: skdebug(__func__, "calloc key handle failed");
766: goto out;
767: }
768: memcpy(response->key_handle, ptr, len);
769: response->key_handle_len = len;
770: }
771: if ((ptr = fido_cred_sig_ptr(cred)) != NULL) {
772: len = fido_cred_sig_len(cred);
773: if ((response->signature = calloc(1, len)) == NULL) {
774: skdebug(__func__, "calloc signature failed");
775: goto out;
776: }
777: memcpy(response->signature, ptr, len);
778: response->signature_len = len;
779: }
780: if ((ptr = fido_cred_x5c_ptr(cred)) != NULL) {
781: len = fido_cred_x5c_len(cred);
1.28 djm 782: skdebug(__func__, "attestation cert len=%zu", len);
1.1 djm 783: if ((response->attestation_cert = calloc(1, len)) == NULL) {
784: skdebug(__func__, "calloc attestation cert failed");
785: goto out;
786: }
787: memcpy(response->attestation_cert, ptr, len);
788: response->attestation_cert_len = len;
789: }
1.26 djm 790: if ((ptr = fido_cred_authdata_ptr(cred)) != NULL) {
791: len = fido_cred_authdata_len(cred);
1.28 djm 792: skdebug(__func__, "authdata len=%zu", len);
1.26 djm 793: if ((response->authdata = calloc(1, len)) == NULL) {
794: skdebug(__func__, "calloc authdata failed");
795: goto out;
796: }
797: memcpy(response->authdata, ptr, len);
798: response->authdata_len = len;
799: }
1.6 markus 800: *enroll_response = response;
1.1 djm 801: response = NULL;
802: ret = 0;
803: out:
804: free(device);
805: if (response != NULL) {
806: free(response->public_key);
807: free(response->key_handle);
808: free(response->signature);
809: free(response->attestation_cert);
1.26 djm 810: free(response->authdata);
1.1 djm 811: free(response);
812: }
1.22 djm 813: sk_close(sk);
814: fido_cred_free(&cred);
1.1 djm 815: return ret;
816: }
817:
1.7 naddy 818: #ifdef WITH_OPENSSL
1.1 djm 819: static int
820: pack_sig_ecdsa(fido_assert_t *assert, struct sk_sign_response *response)
821: {
822: ECDSA_SIG *sig = NULL;
823: const BIGNUM *sig_r, *sig_s;
824: const unsigned char *cp;
825: size_t sig_len;
826: int ret = -1;
827:
828: cp = fido_assert_sig_ptr(assert, 0);
829: sig_len = fido_assert_sig_len(assert, 0);
830: if ((sig = d2i_ECDSA_SIG(NULL, &cp, sig_len)) == NULL) {
831: skdebug(__func__, "d2i_ECDSA_SIG failed");
832: goto out;
833: }
834: ECDSA_SIG_get0(sig, &sig_r, &sig_s);
835: response->sig_r_len = BN_num_bytes(sig_r);
836: response->sig_s_len = BN_num_bytes(sig_s);
837: if ((response->sig_r = calloc(1, response->sig_r_len)) == NULL ||
838: (response->sig_s = calloc(1, response->sig_s_len)) == NULL) {
839: skdebug(__func__, "calloc signature failed");
840: goto out;
841: }
842: BN_bn2bin(sig_r, response->sig_r);
843: BN_bn2bin(sig_s, response->sig_s);
844: ret = 0;
845: out:
846: ECDSA_SIG_free(sig);
847: if (ret != 0) {
848: free(response->sig_r);
849: free(response->sig_s);
850: response->sig_r = NULL;
851: response->sig_s = NULL;
852: }
853: return ret;
854: }
1.7 naddy 855: #endif /* WITH_OPENSSL */
1.1 djm 856:
857: static int
858: pack_sig_ed25519(fido_assert_t *assert, struct sk_sign_response *response)
859: {
860: const unsigned char *ptr;
861: size_t len;
862: int ret = -1;
863:
864: ptr = fido_assert_sig_ptr(assert, 0);
865: len = fido_assert_sig_len(assert, 0);
866: if (len != 64) {
867: skdebug(__func__, "bad length %zu", len);
868: goto out;
869: }
870: response->sig_r_len = len;
871: if ((response->sig_r = calloc(1, response->sig_r_len)) == NULL) {
872: skdebug(__func__, "calloc signature failed");
873: goto out;
874: }
875: memcpy(response->sig_r, ptr, len);
876: ret = 0;
877: out:
878: if (ret != 0) {
879: free(response->sig_r);
880: response->sig_r = NULL;
881: }
882: return ret;
883: }
884:
885: static int
1.12 djm 886: pack_sig(uint32_t alg, fido_assert_t *assert,
887: struct sk_sign_response *response)
1.1 djm 888: {
889: switch(alg) {
1.7 naddy 890: #ifdef WITH_OPENSSL
1.15 djm 891: case SSH_SK_ECDSA:
1.1 djm 892: return pack_sig_ecdsa(assert, response);
1.7 naddy 893: #endif /* WITH_OPENSSL */
1.15 djm 894: case SSH_SK_ED25519:
1.1 djm 895: return pack_sig_ed25519(assert, response);
896: default:
897: return -1;
898: }
899: }
900:
1.12 djm 901: /* Checks sk_options for sk_sign() and sk_load_resident_keys() */
902: static int
903: check_sign_load_resident_options(struct sk_option **options, char **devicep)
904: {
905: size_t i;
906:
907: if (options == NULL)
908: return 0;
909: for (i = 0; options[i] != NULL; i++) {
910: if (strcmp(options[i]->name, "device") == 0) {
911: if ((*devicep = strdup(options[i]->value)) == NULL) {
912: skdebug(__func__, "strdup device failed");
913: return -1;
914: }
915: skdebug(__func__, "requested device %s", *devicep);
916: } else {
917: skdebug(__func__, "requested unsupported option %s",
918: options[i]->name);
919: if (options[i]->required) {
920: skdebug(__func__, "unknown required option");
921: return -1;
922: }
923: }
924: }
925: return 0;
926: }
927:
1.1 djm 928: int
1.17 djm 929: sk_sign(uint32_t alg, const uint8_t *data, size_t datalen,
1.1 djm 930: const char *application,
931: const uint8_t *key_handle, size_t key_handle_len,
1.12 djm 932: uint8_t flags, const char *pin, struct sk_option **options,
933: struct sk_sign_response **sign_response)
1.1 djm 934: {
935: fido_assert_t *assert = NULL;
1.12 djm 936: char *device = NULL;
1.22 djm 937: struct sk_usbhid *sk = NULL;
1.1 djm 938: struct sk_sign_response *response = NULL;
1.17 djm 939: uint8_t message[32];
1.11 djm 940: int ret = SSH_SK_ERR_GENERAL;
1.1 djm 941: int r;
942:
1.18 djm 943: fido_init(SSH_FIDO_INIT_ARG);
1.1 djm 944:
945: if (sign_response == NULL) {
946: skdebug(__func__, "sign_response == NULL");
947: goto out;
948: }
949: *sign_response = NULL;
1.12 djm 950: if (check_sign_load_resident_options(options, &device) != 0)
951: goto out; /* error already logged */
1.17 djm 952: /* hash data to be signed before it goes to the security key */
953: if ((r = sha256_mem(data, datalen, message, sizeof(message))) != 0) {
954: skdebug(__func__, "hash message failed");
955: goto out;
956: }
1.22 djm 957: if (device != NULL)
958: sk = sk_open(device);
959: else if (pin != NULL || (flags & SSH_SK_USER_VERIFICATION_REQD))
960: sk = sk_probe(NULL, NULL, 0);
961: else
962: sk = sk_probe(application, key_handle, key_handle_len);
963: if (sk == NULL) {
964: skdebug(__func__, "failed to find sk");
1.1 djm 965: goto out;
966: }
967: if ((assert = fido_assert_new()) == NULL) {
968: skdebug(__func__, "fido_assert_new failed");
969: goto out;
970: }
971: if ((r = fido_assert_set_clientdata_hash(assert, message,
1.17 djm 972: sizeof(message))) != FIDO_OK) {
1.1 djm 973: skdebug(__func__, "fido_assert_set_clientdata_hash: %s",
974: fido_strerr(r));
975: goto out;
976: }
977: if ((r = fido_assert_set_rp(assert, application)) != FIDO_OK) {
978: skdebug(__func__, "fido_assert_set_rp: %s", fido_strerr(r));
979: goto out;
980: }
981: if ((r = fido_assert_allow_cred(assert, key_handle,
982: key_handle_len)) != FIDO_OK) {
983: skdebug(__func__, "fido_assert_allow_cred: %s", fido_strerr(r));
984: goto out;
985: }
986: if ((r = fido_assert_set_up(assert,
1.15 djm 987: (flags & SSH_SK_USER_PRESENCE_REQD) ?
1.1 djm 988: FIDO_OPT_TRUE : FIDO_OPT_FALSE)) != FIDO_OK) {
989: skdebug(__func__, "fido_assert_set_up: %s", fido_strerr(r));
990: goto out;
991: }
1.21 djm 992: if (pin == NULL && (flags & SSH_SK_USER_VERIFICATION_REQD) &&
993: (r = fido_assert_set_uv(assert, FIDO_OPT_TRUE)) != FIDO_OK) {
994: skdebug(__func__, "fido_assert_set_uv: %s", fido_strerr(r));
995: ret = FIDO_ERR_PIN_REQUIRED;
996: goto out;
997: }
1.22 djm 998: if ((r = fido_dev_get_assert(sk->dev, assert, pin)) != FIDO_OK) {
1.1 djm 999: skdebug(__func__, "fido_dev_get_assert: %s", fido_strerr(r));
1.21 djm 1000: ret = fidoerr_to_skerr(r);
1.1 djm 1001: goto out;
1002: }
1003: if ((response = calloc(1, sizeof(*response))) == NULL) {
1004: skdebug(__func__, "calloc response failed");
1005: goto out;
1006: }
1007: response->flags = fido_assert_flags(assert, 0);
1008: response->counter = fido_assert_sigcount(assert, 0);
1009: if (pack_sig(alg, assert, response) != 0) {
1010: skdebug(__func__, "pack_sig failed");
1011: goto out;
1012: }
1013: *sign_response = response;
1014: response = NULL;
1015: ret = 0;
1016: out:
1.17 djm 1017: explicit_bzero(message, sizeof(message));
1.12 djm 1018: free(device);
1.1 djm 1019: if (response != NULL) {
1020: free(response->sig_r);
1021: free(response->sig_s);
1022: free(response);
1023: }
1.22 djm 1024: sk_close(sk);
1025: fido_assert_free(&assert);
1.1 djm 1026: return ret;
1027: }
1.9 djm 1028:
1029: static int
1.22 djm 1030: read_rks(struct sk_usbhid *sk, const char *pin,
1.9 djm 1031: struct sk_resident_key ***rksp, size_t *nrksp)
1032: {
1.11 djm 1033: int ret = SSH_SK_ERR_GENERAL, r = -1;
1.9 djm 1034: fido_credman_metadata_t *metadata = NULL;
1035: fido_credman_rp_t *rp = NULL;
1036: fido_credman_rk_t *rk = NULL;
1037: size_t i, j, nrp, nrk;
1038: const fido_cred_t *cred;
1039: struct sk_resident_key *srk = NULL, **tmp;
1040:
1.22 djm 1041: if (pin == NULL) {
1042: skdebug(__func__, "no PIN specified");
1043: ret = SSH_SK_ERR_PIN_REQUIRED;
1044: goto out;
1.9 djm 1045: }
1046: if ((metadata = fido_credman_metadata_new()) == NULL) {
1047: skdebug(__func__, "alloc failed");
1048: goto out;
1049: }
1050:
1.22 djm 1051: if ((r = fido_credman_get_dev_metadata(sk->dev, metadata, pin)) != 0) {
1.9 djm 1052: if (r == FIDO_ERR_INVALID_COMMAND) {
1053: skdebug(__func__, "device %s does not support "
1.22 djm 1054: "resident keys", sk->path);
1.11 djm 1055: ret = 0;
1.9 djm 1056: goto out;
1057: }
1058: skdebug(__func__, "get metadata for %s failed: %s",
1.22 djm 1059: sk->path, fido_strerr(r));
1.12 djm 1060: ret = fidoerr_to_skerr(r);
1.9 djm 1061: goto out;
1062: }
1063: skdebug(__func__, "existing %llu, remaining %llu",
1064: (unsigned long long)fido_credman_rk_existing(metadata),
1065: (unsigned long long)fido_credman_rk_remaining(metadata));
1066: if ((rp = fido_credman_rp_new()) == NULL) {
1067: skdebug(__func__, "alloc rp failed");
1068: goto out;
1069: }
1.22 djm 1070: if ((r = fido_credman_get_dev_rp(sk->dev, rp, pin)) != 0) {
1.9 djm 1071: skdebug(__func__, "get RPs for %s failed: %s",
1.22 djm 1072: sk->path, fido_strerr(r));
1.9 djm 1073: goto out;
1074: }
1075: nrp = fido_credman_rp_count(rp);
1076: skdebug(__func__, "Device %s has resident keys for %zu RPs",
1.22 djm 1077: sk->path, nrp);
1.9 djm 1078:
1079: /* Iterate over RP IDs that have resident keys */
1080: for (i = 0; i < nrp; i++) {
1081: skdebug(__func__, "rp %zu: name=\"%s\" id=\"%s\" hashlen=%zu",
1082: i, fido_credman_rp_name(rp, i), fido_credman_rp_id(rp, i),
1083: fido_credman_rp_id_hash_len(rp, i));
1084:
1085: /* Skip non-SSH RP IDs */
1086: if (strncasecmp(fido_credman_rp_id(rp, i), "ssh:", 4) != 0)
1087: continue;
1088:
1089: fido_credman_rk_free(&rk);
1090: if ((rk = fido_credman_rk_new()) == NULL) {
1091: skdebug(__func__, "alloc rk failed");
1092: goto out;
1093: }
1.22 djm 1094: if ((r = fido_credman_get_dev_rk(sk->dev,
1095: fido_credman_rp_id(rp, i), rk, pin)) != 0) {
1.9 djm 1096: skdebug(__func__, "get RKs for %s slot %zu failed: %s",
1.22 djm 1097: sk->path, i, fido_strerr(r));
1.9 djm 1098: goto out;
1099: }
1100: nrk = fido_credman_rk_count(rk);
1101: skdebug(__func__, "RP \"%s\" has %zu resident keys",
1102: fido_credman_rp_id(rp, i), nrk);
1103:
1104: /* Iterate over resident keys for this RP ID */
1105: for (j = 0; j < nrk; j++) {
1106: if ((cred = fido_credman_rk(rk, j)) == NULL) {
1107: skdebug(__func__, "no RK in slot %zu", j);
1108: continue;
1109: }
1110: skdebug(__func__, "Device %s RP \"%s\" slot %zu: "
1.22 djm 1111: "type %d flags 0x%02x prot 0x%02x", sk->path,
1.21 djm 1112: fido_credman_rp_id(rp, i), j, fido_cred_type(cred),
1113: fido_cred_flags(cred), fido_cred_prot(cred));
1.9 djm 1114:
1115: /* build response entry */
1116: if ((srk = calloc(1, sizeof(*srk))) == NULL ||
1117: (srk->key.key_handle = calloc(1,
1118: fido_cred_id_len(cred))) == NULL ||
1119: (srk->application = strdup(fido_credman_rp_id(rp,
1120: i))) == NULL) {
1121: skdebug(__func__, "alloc sk_resident_key");
1122: goto out;
1123: }
1124:
1125: srk->key.key_handle_len = fido_cred_id_len(cred);
1.23 djm 1126: memcpy(srk->key.key_handle, fido_cred_id_ptr(cred),
1.9 djm 1127: srk->key.key_handle_len);
1128:
1129: switch (fido_cred_type(cred)) {
1130: case COSE_ES256:
1.15 djm 1131: srk->alg = SSH_SK_ECDSA;
1.9 djm 1132: break;
1133: case COSE_EDDSA:
1.15 djm 1134: srk->alg = SSH_SK_ED25519;
1.9 djm 1135: break;
1136: default:
1137: skdebug(__func__, "unsupported key type %d",
1138: fido_cred_type(cred));
1.15 djm 1139: goto out; /* XXX free rk and continue */
1.9 djm 1140: }
1.23 djm 1141:
1142: if (fido_cred_prot(cred) == FIDO_CRED_PROT_UV_REQUIRED)
1143: srk->flags |= SSH_SK_USER_VERIFICATION_REQD;
1.9 djm 1144:
1145: if ((r = pack_public_key(srk->alg, cred,
1146: &srk->key)) != 0) {
1147: skdebug(__func__, "pack public key failed");
1148: goto out;
1149: }
1150: /* append */
1151: if ((tmp = recallocarray(*rksp, *nrksp, (*nrksp) + 1,
1152: sizeof(**rksp))) == NULL) {
1153: skdebug(__func__, "alloc rksp");
1154: goto out;
1155: }
1156: *rksp = tmp;
1157: (*rksp)[(*nrksp)++] = srk;
1158: srk = NULL;
1159: }
1160: }
1161: /* Success */
1.11 djm 1162: ret = 0;
1.9 djm 1163: out:
1164: if (srk != NULL) {
1165: free(srk->application);
1166: freezero(srk->key.public_key, srk->key.public_key_len);
1167: freezero(srk->key.key_handle, srk->key.key_handle_len);
1168: freezero(srk, sizeof(*srk));
1169: }
1170: fido_credman_rp_free(&rp);
1171: fido_credman_rk_free(&rk);
1172: fido_credman_metadata_free(&metadata);
1.11 djm 1173: return ret;
1.9 djm 1174: }
1175:
1176: int
1.12 djm 1177: sk_load_resident_keys(const char *pin, struct sk_option **options,
1.9 djm 1178: struct sk_resident_key ***rksp, size_t *nrksp)
1179: {
1.11 djm 1180: int ret = SSH_SK_ERR_GENERAL, r = -1;
1.22 djm 1181: size_t i, nrks = 0;
1.9 djm 1182: struct sk_resident_key **rks = NULL;
1.22 djm 1183: struct sk_usbhid *sk = NULL;
1.12 djm 1184: char *device = NULL;
1.22 djm 1185:
1.9 djm 1186: *rksp = NULL;
1187: *nrksp = 0;
1.18 djm 1188:
1189: fido_init(SSH_FIDO_INIT_ARG);
1.9 djm 1190:
1.12 djm 1191: if (check_sign_load_resident_options(options, &device) != 0)
1192: goto out; /* error already logged */
1.22 djm 1193: if (device != NULL)
1194: sk = sk_open(device);
1195: else
1196: sk = sk_probe(NULL, NULL, 0);
1197: if (sk == NULL) {
1198: skdebug(__func__, "failed to find sk");
1199: goto out;
1200: }
1201: skdebug(__func__, "trying %s", sk->path);
1202: if ((r = read_rks(sk, pin, &rks, &nrks)) != 0) {
1203: skdebug(__func__, "read_rks failed for %s", sk->path);
1204: ret = r;
1205: goto out;
1.9 djm 1206: }
1.12 djm 1207: /* success, unless we have no keys but a specific error */
1208: if (nrks > 0 || ret == SSH_SK_ERR_GENERAL)
1209: ret = 0;
1.9 djm 1210: *rksp = rks;
1211: *nrksp = nrks;
1212: rks = NULL;
1213: nrks = 0;
1214: out:
1.22 djm 1215: sk_close(sk);
1.9 djm 1216: for (i = 0; i < nrks; i++) {
1217: free(rks[i]->application);
1218: freezero(rks[i]->key.public_key, rks[i]->key.public_key_len);
1219: freezero(rks[i]->key.key_handle, rks[i]->key.key_handle_len);
1220: freezero(rks[i], sizeof(*rks[i]));
1221: }
1222: free(rks);
1.11 djm 1223: return ret;
1.9 djm 1224: }
1225:
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