1 /* $OpenBSD: key.c,v 1.96 2011/02/04 00:44:21 djm Exp $ */
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
13 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
14 * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <sys/param.h>
40 #include <sys/types.h>
42 #include <openssl/evp.h>
43 #include <openbsd-compat/openssl-compat.h>
58 static struct KeyCert *
63 cert = xcalloc(1, sizeof(*cert));
64 buffer_init(&cert->certblob);
65 buffer_init(&cert->critical);
66 buffer_init(&cert->extensions);
68 cert->principals = NULL;
69 cert->signature_key = NULL;
79 k = xcalloc(1, sizeof(*k));
89 case KEY_RSA_CERT_V00:
91 if ((rsa = RSA_new()) == NULL)
92 fatal("key_new: RSA_new failed");
93 if ((rsa->n = BN_new()) == NULL)
94 fatal("key_new: BN_new failed");
95 if ((rsa->e = BN_new()) == NULL)
96 fatal("key_new: BN_new failed");
100 case KEY_DSA_CERT_V00:
102 if ((dsa = DSA_new()) == NULL)
103 fatal("key_new: DSA_new failed");
104 if ((dsa->p = BN_new()) == NULL)
105 fatal("key_new: BN_new failed");
106 if ((dsa->q = BN_new()) == NULL)
107 fatal("key_new: BN_new failed");
108 if ((dsa->g = BN_new()) == NULL)
109 fatal("key_new: BN_new failed");
110 if ((dsa->pub_key = BN_new()) == NULL)
111 fatal("key_new: BN_new failed");
114 #ifdef OPENSSL_HAS_ECC
117 /* Cannot do anything until we know the group */
123 fatal("key_new: bad key type %d", k->type);
128 k->cert = cert_new();
134 key_add_private(Key *k)
139 case KEY_RSA_CERT_V00:
141 if ((k->rsa->d = BN_new()) == NULL)
142 fatal("key_new_private: BN_new failed");
143 if ((k->rsa->iqmp = BN_new()) == NULL)
144 fatal("key_new_private: BN_new failed");
145 if ((k->rsa->q = BN_new()) == NULL)
146 fatal("key_new_private: BN_new failed");
147 if ((k->rsa->p = BN_new()) == NULL)
148 fatal("key_new_private: BN_new failed");
149 if ((k->rsa->dmq1 = BN_new()) == NULL)
150 fatal("key_new_private: BN_new failed");
151 if ((k->rsa->dmp1 = BN_new()) == NULL)
152 fatal("key_new_private: BN_new failed");
155 case KEY_DSA_CERT_V00:
157 if ((k->dsa->priv_key = BN_new()) == NULL)
158 fatal("key_new_private: BN_new failed");
162 /* Cannot do anything until we know the group */
172 key_new_private(int type)
174 Key *k = key_new(type);
181 cert_free(struct KeyCert *cert)
185 buffer_free(&cert->certblob);
186 buffer_free(&cert->critical);
187 buffer_free(&cert->extensions);
188 if (cert->key_id != NULL)
190 for (i = 0; i < cert->nprincipals; i++)
191 xfree(cert->principals[i]);
192 if (cert->principals != NULL)
193 xfree(cert->principals);
194 if (cert->signature_key != NULL)
195 key_free(cert->signature_key);
202 fatal("key_free: key is NULL");
206 case KEY_RSA_CERT_V00:
213 case KEY_DSA_CERT_V00:
219 #ifdef OPENSSL_HAS_ECC
222 if (k->ecdsa != NULL)
223 EC_KEY_free(k->ecdsa);
230 fatal("key_free: bad key type %d", k->type);
233 if (key_is_cert(k)) {
243 cert_compare(struct KeyCert *a, struct KeyCert *b)
245 if (a == NULL && b == NULL)
247 if (a == NULL || b == NULL)
249 if (buffer_len(&a->certblob) != buffer_len(&b->certblob))
251 if (timingsafe_bcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob),
252 buffer_len(&a->certblob)) != 0)
258 * Compare public portions of key only, allowing comparisons between
259 * certificates and plain keys too.
262 key_equal_public(const Key *a, const Key *b)
264 #ifdef OPENSSL_HAS_ECC
268 if (a == NULL || b == NULL ||
269 key_type_plain(a->type) != key_type_plain(b->type))
274 case KEY_RSA_CERT_V00:
277 return a->rsa != NULL && b->rsa != NULL &&
278 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
279 BN_cmp(a->rsa->n, b->rsa->n) == 0;
280 case KEY_DSA_CERT_V00:
283 return a->dsa != NULL && b->dsa != NULL &&
284 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
285 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
286 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
287 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
288 #ifdef OPENSSL_HAS_ECC
291 if (a->ecdsa == NULL || b->ecdsa == NULL ||
292 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
293 EC_KEY_get0_public_key(b->ecdsa) == NULL)
295 if ((bnctx = BN_CTX_new()) == NULL)
296 fatal("%s: BN_CTX_new failed", __func__);
297 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
298 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
299 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
300 EC_KEY_get0_public_key(a->ecdsa),
301 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
307 #endif /* OPENSSL_HAS_ECC */
309 fatal("key_equal: bad key type %d", a->type);
315 key_equal(const Key *a, const Key *b)
317 if (a == NULL || b == NULL || a->type != b->type)
319 if (key_is_cert(a)) {
320 if (!cert_compare(a->cert, b->cert))
323 return key_equal_public(a, b);
327 key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length)
329 const EVP_MD *md = NULL;
332 u_char *retval = NULL;
334 int nlen, elen, otype;
336 *dgst_raw_length = 0;
346 fatal("key_fingerprint_raw: bad digest type %d",
351 nlen = BN_num_bytes(k->rsa->n);
352 elen = BN_num_bytes(k->rsa->e);
355 BN_bn2bin(k->rsa->n, blob);
356 BN_bn2bin(k->rsa->e, blob + nlen);
361 key_to_blob(k, &blob, &len);
363 case KEY_DSA_CERT_V00:
364 case KEY_RSA_CERT_V00:
368 /* We want a fingerprint of the _key_ not of the cert */
370 k->type = key_type_plain(k->type);
371 key_to_blob(k, &blob, &len);
377 fatal("key_fingerprint_raw: bad key type %d", k->type);
381 retval = xmalloc(EVP_MAX_MD_SIZE);
382 EVP_DigestInit(&ctx, md);
383 EVP_DigestUpdate(&ctx, blob, len);
384 EVP_DigestFinal(&ctx, retval, dgst_raw_length);
385 memset(blob, 0, len);
388 fatal("key_fingerprint_raw: blob is null");
394 key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
399 retval = xcalloc(1, dgst_raw_len * 3 + 1);
400 for (i = 0; i < dgst_raw_len; i++) {
402 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
403 strlcat(retval, hex, dgst_raw_len * 3 + 1);
406 /* Remove the trailing ':' character */
407 retval[(dgst_raw_len * 3) - 1] = '\0';
412 key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
414 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
415 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
416 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
417 u_int i, j = 0, rounds, seed = 1;
420 rounds = (dgst_raw_len / 2) + 1;
421 retval = xcalloc((rounds * 6), sizeof(char));
423 for (i = 0; i < rounds; i++) {
424 u_int idx0, idx1, idx2, idx3, idx4;
425 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
426 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
428 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
429 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
431 retval[j++] = vowels[idx0];
432 retval[j++] = consonants[idx1];
433 retval[j++] = vowels[idx2];
434 if ((i + 1) < rounds) {
435 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
436 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
437 retval[j++] = consonants[idx3];
439 retval[j++] = consonants[idx4];
441 ((((u_int)(dgst_raw[2 * i])) * 7) +
442 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
448 retval[j++] = vowels[idx0];
449 retval[j++] = consonants[idx1];
450 retval[j++] = vowels[idx2];
459 * Draw an ASCII-Art representing the fingerprint so human brain can
460 * profit from its built-in pattern recognition ability.
461 * This technique is called "random art" and can be found in some
462 * scientific publications like this original paper:
464 * "Hash Visualization: a New Technique to improve Real-World Security",
465 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
466 * Techniques and E-Commerce (CrypTEC '99)
467 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
469 * The subject came up in a talk by Dan Kaminsky, too.
471 * If you see the picture is different, the key is different.
472 * If the picture looks the same, you still know nothing.
474 * The algorithm used here is a worm crawling over a discrete plane,
475 * leaving a trace (augmenting the field) everywhere it goes.
476 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
477 * makes the respective movement vector be ignored for this turn.
478 * Graphs are not unambiguous, because circles in graphs can be
479 * walked in either direction.
483 * Field sizes for the random art. Have to be odd, so the starting point
484 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
485 * Else pictures would be too dense, and drawing the frame would
486 * fail, too, because the key type would not fit in anymore.
489 #define FLDSIZE_Y (FLDBASE + 1)
490 #define FLDSIZE_X (FLDBASE * 2 + 1)
492 key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k)
495 * Chars to be used after each other every time the worm
496 * intersects with itself. Matter of taste.
498 char *augmentation_string = " .o+=*BOX@%&#/^SE";
500 u_char field[FLDSIZE_X][FLDSIZE_Y];
503 size_t len = strlen(augmentation_string) - 1;
505 retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2));
507 /* initialize field */
508 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
512 /* process raw key */
513 for (i = 0; i < dgst_raw_len; i++) {
515 /* each byte conveys four 2-bit move commands */
517 for (b = 0; b < 4; b++) {
518 /* evaluate 2 bit, rest is shifted later */
519 x += (input & 0x1) ? 1 : -1;
520 y += (input & 0x2) ? 1 : -1;
522 /* assure we are still in bounds */
525 x = MIN(x, FLDSIZE_X - 1);
526 y = MIN(y, FLDSIZE_Y - 1);
528 /* augment the field */
529 if (field[x][y] < len - 2)
535 /* mark starting point and end point*/
536 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
540 snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
541 p = strchr(retval, '\0');
543 /* output upper border */
544 for (i = p - retval - 1; i < FLDSIZE_X; i++)
550 for (y = 0; y < FLDSIZE_Y; y++) {
552 for (x = 0; x < FLDSIZE_X; x++)
553 *p++ = augmentation_string[MIN(field[x][y], len)];
558 /* output lower border */
560 for (i = 0; i < FLDSIZE_X; i++)
568 key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
574 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
576 fatal("key_fingerprint: null from key_fingerprint_raw()");
579 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
581 case SSH_FP_BUBBLEBABBLE:
582 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
584 case SSH_FP_RANDOMART:
585 retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k);
588 fatal("key_fingerprint: bad digest representation %d",
592 memset(dgst_raw, 0, dgst_raw_len);
598 * Reads a multiple-precision integer in decimal from the buffer, and advances
599 * the pointer. The integer must already be initialized. This function is
600 * permitted to modify the buffer. This leaves *cpp to point just beyond the
601 * last processed (and maybe modified) character. Note that this may modify
602 * the buffer containing the number.
605 read_bignum(char **cpp, BIGNUM * value)
610 /* Skip any leading whitespace. */
611 for (; *cp == ' ' || *cp == '\t'; cp++)
614 /* Check that it begins with a decimal digit. */
615 if (*cp < '0' || *cp > '9')
618 /* Save starting position. */
621 /* Move forward until all decimal digits skipped. */
622 for (; *cp >= '0' && *cp <= '9'; cp++)
625 /* Save the old terminating character, and replace it by \0. */
629 /* Parse the number. */
630 if (BN_dec2bn(&value, *cpp) == 0)
633 /* Restore old terminating character. */
636 /* Move beyond the number and return success. */
642 write_bignum(FILE *f, BIGNUM *num)
644 char *buf = BN_bn2dec(num);
646 error("write_bignum: BN_bn2dec() failed");
649 fprintf(f, " %s", buf);
654 /* returns 1 ok, -1 error */
656 key_read(Key *ret, char **cpp)
664 #ifdef OPENSSL_HAS_ECC
672 /* Get number of bits. */
673 if (*cp < '0' || *cp > '9')
674 return -1; /* Bad bit count... */
675 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
676 bits = 10 * bits + *cp - '0';
680 /* Get public exponent, public modulus. */
681 if (!read_bignum(cpp, ret->rsa->e))
683 if (!read_bignum(cpp, ret->rsa->n))
685 /* validate the claimed number of bits */
686 if ((u_int)BN_num_bits(ret->rsa->n) != bits) {
687 verbose("key_read: claimed key size %d does not match "
688 "actual %d", bits, BN_num_bits(ret->rsa->n));
697 case KEY_DSA_CERT_V00:
698 case KEY_RSA_CERT_V00:
702 space = strchr(cp, ' ');
704 debug3("key_read: missing whitespace");
708 type = key_type_from_name(cp);
709 #ifdef OPENSSL_HAS_ECC
710 if (key_type_plain(type) == KEY_ECDSA &&
711 (curve_nid = key_ecdsa_nid_from_name(cp)) == -1) {
712 debug("key_read: invalid curve");
717 if (type == KEY_UNSPEC) {
718 debug3("key_read: missing keytype");
723 debug3("key_read: short string");
726 if (ret->type == KEY_UNSPEC) {
728 } else if (ret->type != type) {
729 /* is a key, but different type */
730 debug3("key_read: type mismatch");
735 n = uudecode(cp, blob, len);
737 error("key_read: uudecode %s failed", cp);
741 k = key_from_blob(blob, (u_int)n);
744 error("key_read: key_from_blob %s failed", cp);
747 if (k->type != type) {
748 error("key_read: type mismatch: encoding error");
752 #ifdef OPENSSL_HAS_ECC
753 if (key_type_plain(type) == KEY_ECDSA &&
754 curve_nid != k->ecdsa_nid) {
755 error("key_read: type mismatch: EC curve mismatch");
761 if (key_is_cert(ret)) {
762 if (!key_is_cert(k)) {
763 error("key_read: loaded key is not a cert");
767 if (ret->cert != NULL)
768 cert_free(ret->cert);
772 if (key_type_plain(ret->type) == KEY_RSA) {
773 if (ret->rsa != NULL)
778 RSA_print_fp(stderr, ret->rsa, 8);
781 if (key_type_plain(ret->type) == KEY_DSA) {
782 if (ret->dsa != NULL)
787 DSA_print_fp(stderr, ret->dsa, 8);
790 #ifdef OPENSSL_HAS_ECC
791 if (key_type_plain(ret->type) == KEY_ECDSA) {
792 if (ret->ecdsa != NULL)
793 EC_KEY_free(ret->ecdsa);
794 ret->ecdsa = k->ecdsa;
795 ret->ecdsa_nid = k->ecdsa_nid;
799 key_dump_ec_key(ret->ecdsa);
808 /* advance cp: skip whitespace and data */
809 while (*cp == ' ' || *cp == '\t')
811 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
816 fatal("key_read: bad key type: %d", ret->type);
823 key_write(const Key *key, FILE *f)
830 if (key_is_cert(key)) {
831 if (key->cert == NULL) {
832 error("%s: no cert data", __func__);
835 if (buffer_len(&key->cert->certblob) == 0) {
836 error("%s: no signed certificate blob", __func__);
843 if (key->rsa == NULL)
845 /* size of modulus 'n' */
846 bits = BN_num_bits(key->rsa->n);
847 fprintf(f, "%u", bits);
848 if (write_bignum(f, key->rsa->e) &&
849 write_bignum(f, key->rsa->n))
851 error("key_write: failed for RSA key");
854 case KEY_DSA_CERT_V00:
856 if (key->dsa == NULL)
859 #ifdef OPENSSL_HAS_ECC
862 if (key->ecdsa == NULL)
867 case KEY_RSA_CERT_V00:
869 if (key->rsa == NULL)
876 key_to_blob(key, &blob, &len);
878 n = uuencode(blob, len, uu, 2*len);
880 fprintf(f, "%s %s", key_ssh_name(key), uu);
890 key_type(const Key *k)
899 #ifdef OPENSSL_HAS_ECC
903 case KEY_RSA_CERT_V00:
904 return "RSA-CERT-V00";
905 case KEY_DSA_CERT_V00:
906 return "DSA-CERT-V00";
911 #ifdef OPENSSL_HAS_ECC
920 key_cert_type(const Key *k)
922 switch (k->cert->type) {
923 case SSH2_CERT_TYPE_USER:
925 case SSH2_CERT_TYPE_HOST:
933 key_ssh_name_from_type_nid(int type, int nid)
940 case KEY_RSA_CERT_V00:
941 return "ssh-rsa-cert-v00@openssh.com";
942 case KEY_DSA_CERT_V00:
943 return "ssh-dss-cert-v00@openssh.com";
945 return "ssh-rsa-cert-v01@openssh.com";
947 return "ssh-dss-cert-v01@openssh.com";
948 #ifdef OPENSSL_HAS_ECC
951 case NID_X9_62_prime256v1:
952 return "ecdsa-sha2-nistp256";
954 return "ecdsa-sha2-nistp384";
956 return "ecdsa-sha2-nistp521";
963 case NID_X9_62_prime256v1:
964 return "ecdsa-sha2-nistp256-cert-v01@openssh.com";
966 return "ecdsa-sha2-nistp384-cert-v01@openssh.com";
968 return "ecdsa-sha2-nistp521-cert-v01@openssh.com";
973 #endif /* OPENSSL_HAS_ECC */
975 return "ssh-unknown";
979 key_ssh_name(const Key *k)
981 return key_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
985 key_ssh_name_plain(const Key *k)
987 return key_ssh_name_from_type_nid(key_type_plain(k->type),
992 key_size(const Key *k)
997 case KEY_RSA_CERT_V00:
999 return BN_num_bits(k->rsa->n);
1001 case KEY_DSA_CERT_V00:
1003 return BN_num_bits(k->dsa->p);
1004 #ifdef OPENSSL_HAS_ECC
1006 case KEY_ECDSA_CERT:
1007 return key_curve_nid_to_bits(k->ecdsa_nid);
1014 rsa_generate_private_key(u_int bits)
1016 RSA *private = RSA_new();
1017 BIGNUM *f4 = BN_new();
1019 if (private == NULL)
1020 fatal("%s: RSA_new failed", __func__);
1022 fatal("%s: BN_new failed", __func__);
1023 if (!BN_set_word(f4, RSA_F4))
1024 fatal("%s: BN_new failed", __func__);
1025 if (!RSA_generate_key_ex(private, bits, f4, NULL))
1026 fatal("%s: key generation failed.", __func__);
1032 dsa_generate_private_key(u_int bits)
1034 DSA *private = DSA_new();
1036 if (private == NULL)
1037 fatal("%s: DSA_new failed", __func__);
1038 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1040 fatal("%s: DSA_generate_parameters failed", __func__);
1041 if (!DSA_generate_key(private))
1042 fatal("%s: DSA_generate_key failed.", __func__);
1047 key_ecdsa_bits_to_nid(int bits)
1050 #ifdef OPENSSL_HAS_ECC
1052 return NID_X9_62_prime256v1;
1054 return NID_secp384r1;
1056 return NID_secp521r1;
1063 #ifdef OPENSSL_HAS_ECC
1065 key_ecdsa_key_to_nid(EC_KEY *k)
1069 NID_X9_62_prime256v1,
1077 const EC_GROUP *g = EC_KEY_get0_group(k);
1080 * The group may be stored in a ASN.1 encoded private key in one of two
1081 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1082 * or explicit group parameters encoded into the key blob. Only the
1083 * "named group" case sets the group NID for us, but we can figure
1084 * it out for the other case by comparing against all the groups that
1087 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1089 if ((bnctx = BN_CTX_new()) == NULL)
1090 fatal("%s: BN_CTX_new() failed", __func__);
1091 for (i = 0; nids[i] != -1; i++) {
1092 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1093 fatal("%s: EC_GROUP_new_by_curve_name failed",
1095 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1100 debug3("%s: nid = %d", __func__, nids[i]);
1101 if (nids[i] != -1) {
1102 /* Use the group with the NID attached */
1103 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1104 if (EC_KEY_set_group(k, eg) != 1)
1105 fatal("%s: EC_KEY_set_group", __func__);
1111 ecdsa_generate_private_key(u_int bits, int *nid)
1115 if ((*nid = key_ecdsa_bits_to_nid(bits)) == -1)
1116 fatal("%s: invalid key length", __func__);
1117 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL)
1118 fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1119 if (EC_KEY_generate_key(private) != 1)
1120 fatal("%s: EC_KEY_generate_key failed", __func__);
1121 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1124 #endif /* OPENSSL_HAS_ECC */
1127 key_generate(int type, u_int bits)
1129 Key *k = key_new(KEY_UNSPEC);
1132 k->dsa = dsa_generate_private_key(bits);
1134 #ifdef OPENSSL_HAS_ECC
1136 k->ecdsa = ecdsa_generate_private_key(bits, &k->ecdsa_nid);
1141 k->rsa = rsa_generate_private_key(bits);
1143 case KEY_RSA_CERT_V00:
1144 case KEY_DSA_CERT_V00:
1147 fatal("key_generate: cert keys cannot be generated directly");
1149 fatal("key_generate: unknown type %d", type);
1156 key_cert_copy(const Key *from_key, struct Key *to_key)
1159 const struct KeyCert *from;
1162 if (to_key->cert != NULL) {
1163 cert_free(to_key->cert);
1164 to_key->cert = NULL;
1167 if ((from = from_key->cert) == NULL)
1170 to = to_key->cert = cert_new();
1172 buffer_append(&to->certblob, buffer_ptr(&from->certblob),
1173 buffer_len(&from->certblob));
1175 buffer_append(&to->critical,
1176 buffer_ptr(&from->critical), buffer_len(&from->critical));
1177 buffer_append(&to->extensions,
1178 buffer_ptr(&from->extensions), buffer_len(&from->extensions));
1180 to->serial = from->serial;
1181 to->type = from->type;
1182 to->key_id = from->key_id == NULL ? NULL : xstrdup(from->key_id);
1183 to->valid_after = from->valid_after;
1184 to->valid_before = from->valid_before;
1185 to->signature_key = from->signature_key == NULL ?
1186 NULL : key_from_private(from->signature_key);
1188 to->nprincipals = from->nprincipals;
1189 if (to->nprincipals > CERT_MAX_PRINCIPALS)
1190 fatal("%s: nprincipals (%u) > CERT_MAX_PRINCIPALS (%u)",
1191 __func__, to->nprincipals, CERT_MAX_PRINCIPALS);
1192 if (to->nprincipals > 0) {
1193 to->principals = xcalloc(from->nprincipals,
1194 sizeof(*to->principals));
1195 for (i = 0; i < to->nprincipals; i++)
1196 to->principals[i] = xstrdup(from->principals[i]);
1201 key_from_private(const Key *k)
1206 case KEY_DSA_CERT_V00:
1208 n = key_new(k->type);
1209 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1210 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1211 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1212 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL))
1213 fatal("key_from_private: BN_copy failed");
1215 #ifdef OPENSSL_HAS_ECC
1217 case KEY_ECDSA_CERT:
1218 n = key_new(k->type);
1219 n->ecdsa_nid = k->ecdsa_nid;
1220 if ((n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid)) == NULL)
1221 fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1222 if (EC_KEY_set_public_key(n->ecdsa,
1223 EC_KEY_get0_public_key(k->ecdsa)) != 1)
1224 fatal("%s: EC_KEY_set_public_key failed", __func__);
1229 case KEY_RSA_CERT_V00:
1231 n = key_new(k->type);
1232 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1233 (BN_copy(n->rsa->e, k->rsa->e) == NULL))
1234 fatal("key_from_private: BN_copy failed");
1237 fatal("key_from_private: unknown type %d", k->type);
1241 key_cert_copy(k, n);
1246 key_type_from_name(char *name)
1248 if (strcmp(name, "rsa1") == 0) {
1250 } else if (strcmp(name, "rsa") == 0) {
1252 } else if (strcmp(name, "dsa") == 0) {
1254 } else if (strcmp(name, "ssh-rsa") == 0) {
1256 } else if (strcmp(name, "ssh-dss") == 0) {
1258 #ifdef OPENSSL_HAS_ECC
1259 } else if (strcmp(name, "ecdsa") == 0 ||
1260 strcmp(name, "ecdsa-sha2-nistp256") == 0 ||
1261 strcmp(name, "ecdsa-sha2-nistp384") == 0 ||
1262 strcmp(name, "ecdsa-sha2-nistp521") == 0) {
1265 } else if (strcmp(name, "ssh-rsa-cert-v00@openssh.com") == 0) {
1266 return KEY_RSA_CERT_V00;
1267 } else if (strcmp(name, "ssh-dss-cert-v00@openssh.com") == 0) {
1268 return KEY_DSA_CERT_V00;
1269 } else if (strcmp(name, "ssh-rsa-cert-v01@openssh.com") == 0) {
1270 return KEY_RSA_CERT;
1271 } else if (strcmp(name, "ssh-dss-cert-v01@openssh.com") == 0) {
1272 return KEY_DSA_CERT;
1273 #ifdef OPENSSL_HAS_ECC
1274 } else if (strcmp(name, "ecdsa-sha2-nistp256-cert-v01@openssh.com") == 0 ||
1275 strcmp(name, "ecdsa-sha2-nistp384-cert-v01@openssh.com") == 0 ||
1276 strcmp(name, "ecdsa-sha2-nistp521-cert-v01@openssh.com") == 0) {
1277 return KEY_ECDSA_CERT;
1281 debug2("key_type_from_name: unknown key type '%s'", name);
1286 key_ecdsa_nid_from_name(const char *name)
1288 #ifdef OPENSSL_HAS_ECC
1289 if (strcmp(name, "ecdsa-sha2-nistp256") == 0 ||
1290 strcmp(name, "ecdsa-sha2-nistp256-cert-v01@openssh.com") == 0)
1291 return NID_X9_62_prime256v1;
1292 if (strcmp(name, "ecdsa-sha2-nistp384") == 0 ||
1293 strcmp(name, "ecdsa-sha2-nistp384-cert-v01@openssh.com") == 0)
1294 return NID_secp384r1;
1295 if (strcmp(name, "ecdsa-sha2-nistp521") == 0 ||
1296 strcmp(name, "ecdsa-sha2-nistp521-cert-v01@openssh.com") == 0)
1297 return NID_secp521r1;
1298 #endif /* OPENSSL_HAS_ECC */
1300 debug2("%s: unknown/non-ECDSA key type '%s'", __func__, name);
1305 key_names_valid2(const char *names)
1309 if (names == NULL || strcmp(names, "") == 0)
1311 s = cp = xstrdup(names);
1312 for ((p = strsep(&cp, ",")); p && *p != '\0';
1313 (p = strsep(&cp, ","))) {
1314 switch (key_type_from_name(p)) {
1321 debug3("key names ok: [%s]", names);
1327 cert_parse(Buffer *b, Key *key, const u_char *blob, u_int blen)
1329 u_char *principals, *critical, *exts, *sig_key, *sig;
1330 u_int signed_len, plen, clen, sklen, slen, kidlen, elen;
1334 int v00 = key->type == KEY_DSA_CERT_V00 ||
1335 key->type == KEY_RSA_CERT_V00;
1339 /* Copy the entire key blob for verification and later serialisation */
1340 buffer_append(&key->cert->certblob, blob, blen);
1342 elen = 0; /* Not touched for v00 certs */
1343 principals = exts = critical = sig_key = sig = NULL;
1344 if ((!v00 && buffer_get_int64_ret(&key->cert->serial, b) != 0) ||
1345 buffer_get_int_ret(&key->cert->type, b) != 0 ||
1346 (key->cert->key_id = buffer_get_cstring_ret(b, &kidlen)) == NULL ||
1347 (principals = buffer_get_string_ret(b, &plen)) == NULL ||
1348 buffer_get_int64_ret(&key->cert->valid_after, b) != 0 ||
1349 buffer_get_int64_ret(&key->cert->valid_before, b) != 0 ||
1350 (critical = buffer_get_string_ret(b, &clen)) == NULL ||
1351 (!v00 && (exts = buffer_get_string_ret(b, &elen)) == NULL) ||
1352 (v00 && buffer_get_string_ptr_ret(b, NULL) == NULL) || /* nonce */
1353 buffer_get_string_ptr_ret(b, NULL) == NULL || /* reserved */
1354 (sig_key = buffer_get_string_ret(b, &sklen)) == NULL) {
1355 error("%s: parse error", __func__);
1359 if (kidlen != strlen(key->cert->key_id)) {
1360 error("%s: key ID contains \\0 character", __func__);
1364 /* Signature is left in the buffer so we can calculate this length */
1365 signed_len = buffer_len(&key->cert->certblob) - buffer_len(b);
1367 if ((sig = buffer_get_string_ret(b, &slen)) == NULL) {
1368 error("%s: parse error", __func__);
1372 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1373 key->cert->type != SSH2_CERT_TYPE_HOST) {
1374 error("Unknown certificate type %u", key->cert->type);
1378 buffer_append(&tmp, principals, plen);
1379 while (buffer_len(&tmp) > 0) {
1380 if (key->cert->nprincipals >= CERT_MAX_PRINCIPALS) {
1381 error("%s: Too many principals", __func__);
1384 if ((principal = buffer_get_cstring_ret(&tmp, &plen)) == NULL) {
1385 error("%s: Principals data invalid", __func__);
1388 key->cert->principals = xrealloc(key->cert->principals,
1389 key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1390 key->cert->principals[key->cert->nprincipals++] = principal;
1395 buffer_append(&key->cert->critical, critical, clen);
1396 buffer_append(&tmp, critical, clen);
1397 /* validate structure */
1398 while (buffer_len(&tmp) != 0) {
1399 if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1400 buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1401 error("%s: critical option data invalid", __func__);
1407 buffer_append(&key->cert->extensions, exts, elen);
1408 buffer_append(&tmp, exts, elen);
1409 /* validate structure */
1410 while (buffer_len(&tmp) != 0) {
1411 if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1412 buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1413 error("%s: extension data invalid", __func__);
1419 if ((key->cert->signature_key = key_from_blob(sig_key,
1421 error("%s: Signature key invalid", __func__);
1424 if (key->cert->signature_key->type != KEY_RSA &&
1425 key->cert->signature_key->type != KEY_DSA &&
1426 key->cert->signature_key->type != KEY_ECDSA) {
1427 error("%s: Invalid signature key type %s (%d)", __func__,
1428 key_type(key->cert->signature_key),
1429 key->cert->signature_key->type);
1433 switch (key_verify(key->cert->signature_key, sig, slen,
1434 buffer_ptr(&key->cert->certblob), signed_len)) {
1437 break; /* Good signature */
1439 error("%s: Invalid signature on certificate", __func__);
1442 error("%s: Certificate signature verification failed",
1449 if (principals != NULL)
1451 if (critical != NULL)
1455 if (sig_key != NULL)
1463 key_from_blob(const u_char *blob, u_int blen)
1467 char *ktype = NULL, *curve = NULL;
1469 #ifdef OPENSSL_HAS_ECC
1475 dump_base64(stderr, blob, blen);
1478 buffer_append(&b, blob, blen);
1479 if ((ktype = buffer_get_cstring_ret(&b, NULL)) == NULL) {
1480 error("key_from_blob: can't read key type");
1484 type = key_type_from_name(ktype);
1485 #ifdef OPENSSL_HAS_ECC
1486 if (key_type_plain(type) == KEY_ECDSA)
1487 nid = key_ecdsa_nid_from_name(ktype);
1492 (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1495 case KEY_RSA_CERT_V00:
1496 key = key_new(type);
1497 if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
1498 buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
1499 error("key_from_blob: can't read rsa key");
1506 RSA_print_fp(stderr, key->rsa, 8);
1510 (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1513 case KEY_DSA_CERT_V00:
1514 key = key_new(type);
1515 if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
1516 buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
1517 buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
1518 buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
1519 error("key_from_blob: can't read dsa key");
1523 DSA_print_fp(stderr, key->dsa, 8);
1526 #ifdef OPENSSL_HAS_ECC
1527 case KEY_ECDSA_CERT:
1528 (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1531 key = key_new(type);
1532 key->ecdsa_nid = nid;
1533 if ((curve = buffer_get_string_ret(&b, NULL)) == NULL) {
1534 error("key_from_blob: can't read ecdsa curve");
1537 if (key->ecdsa_nid != key_curve_name_to_nid(curve)) {
1538 error("key_from_blob: ecdsa curve doesn't match type");
1541 if (key->ecdsa != NULL)
1542 EC_KEY_free(key->ecdsa);
1543 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1545 fatal("key_from_blob: EC_KEY_new_by_curve_name failed");
1546 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL)
1547 fatal("key_from_blob: EC_POINT_new failed");
1548 if (buffer_get_ecpoint_ret(&b, EC_KEY_get0_group(key->ecdsa),
1550 error("key_from_blob: can't read ecdsa key point");
1553 if (key_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1556 if (EC_KEY_set_public_key(key->ecdsa, q) != 1)
1557 fatal("key_from_blob: EC_KEY_set_public_key failed");
1559 key_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1562 #endif /* OPENSSL_HAS_ECC */
1564 key = key_new(type);
1567 error("key_from_blob: cannot handle type %s", ktype);
1570 if (key_is_cert(key) && cert_parse(&b, key, blob, blen) == -1) {
1571 error("key_from_blob: can't parse cert data");
1574 rlen = buffer_len(&b);
1575 if (key != NULL && rlen != 0)
1576 error("key_from_blob: remaining bytes in key blob %d", rlen);
1582 #ifdef OPENSSL_HAS_ECC
1591 key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1597 error("key_to_blob: key == NULL");
1601 switch (key->type) {
1602 case KEY_DSA_CERT_V00:
1603 case KEY_RSA_CERT_V00:
1605 case KEY_ECDSA_CERT:
1607 /* Use the existing blob */
1608 buffer_append(&b, buffer_ptr(&key->cert->certblob),
1609 buffer_len(&key->cert->certblob));
1612 buffer_put_cstring(&b, key_ssh_name(key));
1613 buffer_put_bignum2(&b, key->dsa->p);
1614 buffer_put_bignum2(&b, key->dsa->q);
1615 buffer_put_bignum2(&b, key->dsa->g);
1616 buffer_put_bignum2(&b, key->dsa->pub_key);
1618 #ifdef OPENSSL_HAS_ECC
1620 buffer_put_cstring(&b, key_ssh_name(key));
1621 buffer_put_cstring(&b, key_curve_nid_to_name(key->ecdsa_nid));
1622 buffer_put_ecpoint(&b, EC_KEY_get0_group(key->ecdsa),
1623 EC_KEY_get0_public_key(key->ecdsa));
1627 buffer_put_cstring(&b, key_ssh_name(key));
1628 buffer_put_bignum2(&b, key->rsa->e);
1629 buffer_put_bignum2(&b, key->rsa->n);
1632 error("key_to_blob: unsupported key type %d", key->type);
1636 len = buffer_len(&b);
1639 if (blobp != NULL) {
1640 *blobp = xmalloc(len);
1641 memcpy(*blobp, buffer_ptr(&b), len);
1643 memset(buffer_ptr(&b), 0, len);
1651 u_char **sigp, u_int *lenp,
1652 const u_char *data, u_int datalen)
1654 switch (key->type) {
1655 case KEY_DSA_CERT_V00:
1658 return ssh_dss_sign(key, sigp, lenp, data, datalen);
1659 #ifdef OPENSSL_HAS_ECC
1660 case KEY_ECDSA_CERT:
1662 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen);
1664 case KEY_RSA_CERT_V00:
1667 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
1669 error("key_sign: invalid key type %d", key->type);
1675 * key_verify returns 1 for a correct signature, 0 for an incorrect signature
1681 const u_char *signature, u_int signaturelen,
1682 const u_char *data, u_int datalen)
1684 if (signaturelen == 0)
1687 switch (key->type) {
1688 case KEY_DSA_CERT_V00:
1691 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
1692 #ifdef OPENSSL_HAS_ECC
1693 case KEY_ECDSA_CERT:
1695 return ssh_ecdsa_verify(key, signature, signaturelen, data, datalen);
1697 case KEY_RSA_CERT_V00:
1700 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
1702 error("key_verify: invalid key type %d", key->type);
1707 /* Converts a private to a public key */
1709 key_demote(const Key *k)
1713 pk = xcalloc(1, sizeof(*pk));
1715 pk->flags = k->flags;
1716 pk->ecdsa_nid = k->ecdsa_nid;
1722 case KEY_RSA_CERT_V00:
1724 key_cert_copy(k, pk);
1728 if ((pk->rsa = RSA_new()) == NULL)
1729 fatal("key_demote: RSA_new failed");
1730 if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
1731 fatal("key_demote: BN_dup failed");
1732 if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
1733 fatal("key_demote: BN_dup failed");
1735 case KEY_DSA_CERT_V00:
1737 key_cert_copy(k, pk);
1740 if ((pk->dsa = DSA_new()) == NULL)
1741 fatal("key_demote: DSA_new failed");
1742 if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
1743 fatal("key_demote: BN_dup failed");
1744 if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
1745 fatal("key_demote: BN_dup failed");
1746 if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
1747 fatal("key_demote: BN_dup failed");
1748 if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
1749 fatal("key_demote: BN_dup failed");
1751 #ifdef OPENSSL_HAS_ECC
1752 case KEY_ECDSA_CERT:
1753 key_cert_copy(k, pk);
1756 if ((pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid)) == NULL)
1757 fatal("key_demote: EC_KEY_new_by_curve_name failed");
1758 if (EC_KEY_set_public_key(pk->ecdsa,
1759 EC_KEY_get0_public_key(k->ecdsa)) != 1)
1760 fatal("key_demote: EC_KEY_set_public_key failed");
1764 fatal("key_free: bad key type %d", k->type);
1772 key_is_cert(const Key *k)
1777 case KEY_RSA_CERT_V00:
1778 case KEY_DSA_CERT_V00:
1781 case KEY_ECDSA_CERT:
1788 /* Return the cert-less equivalent to a certified key type */
1790 key_type_plain(int type)
1793 case KEY_RSA_CERT_V00:
1796 case KEY_DSA_CERT_V00:
1799 case KEY_ECDSA_CERT:
1806 /* Convert a KEY_RSA or KEY_DSA to their _CERT equivalent */
1808 key_to_certified(Key *k, int legacy)
1812 k->cert = cert_new();
1813 k->type = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
1816 k->cert = cert_new();
1817 k->type = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
1820 k->cert = cert_new();
1821 k->type = KEY_ECDSA_CERT;
1824 error("%s: key has incorrect type %s", __func__, key_type(k));
1829 /* Convert a KEY_RSA_CERT or KEY_DSA_CERT to their raw key equivalent */
1831 key_drop_cert(Key *k)
1834 case KEY_RSA_CERT_V00:
1839 case KEY_DSA_CERT_V00:
1844 case KEY_ECDSA_CERT:
1846 k->type = KEY_ECDSA;
1849 error("%s: key has incorrect type %s", __func__, key_type(k));
1855 * Sign a KEY_RSA_CERT, KEY_DSA_CERT or KEY_ECDSA_CERT, (re-)generating
1856 * the signed certblob
1859 key_certify(Key *k, Key *ca)
1862 u_char *ca_blob, *sig_blob, nonce[32];
1863 u_int i, ca_len, sig_len;
1865 if (k->cert == NULL) {
1866 error("%s: key lacks cert info", __func__);
1870 if (!key_is_cert(k)) {
1871 error("%s: certificate has unknown type %d", __func__,
1876 if (ca->type != KEY_RSA && ca->type != KEY_DSA &&
1877 ca->type != KEY_ECDSA) {
1878 error("%s: CA key has unsupported type %s", __func__,
1883 key_to_blob(ca, &ca_blob, &ca_len);
1885 buffer_clear(&k->cert->certblob);
1886 buffer_put_cstring(&k->cert->certblob, key_ssh_name(k));
1888 /* -v01 certs put nonce first */
1889 arc4random_buf(&nonce, sizeof(nonce));
1890 if (!key_cert_is_legacy(k))
1891 buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
1894 case KEY_DSA_CERT_V00:
1896 buffer_put_bignum2(&k->cert->certblob, k->dsa->p);
1897 buffer_put_bignum2(&k->cert->certblob, k->dsa->q);
1898 buffer_put_bignum2(&k->cert->certblob, k->dsa->g);
1899 buffer_put_bignum2(&k->cert->certblob, k->dsa->pub_key);
1901 #ifdef OPENSSL_HAS_ECC
1902 case KEY_ECDSA_CERT:
1903 buffer_put_cstring(&k->cert->certblob,
1904 key_curve_nid_to_name(k->ecdsa_nid));
1905 buffer_put_ecpoint(&k->cert->certblob,
1906 EC_KEY_get0_group(k->ecdsa),
1907 EC_KEY_get0_public_key(k->ecdsa));
1910 case KEY_RSA_CERT_V00:
1912 buffer_put_bignum2(&k->cert->certblob, k->rsa->e);
1913 buffer_put_bignum2(&k->cert->certblob, k->rsa->n);
1916 error("%s: key has incorrect type %s", __func__, key_type(k));
1917 buffer_clear(&k->cert->certblob);
1922 /* -v01 certs have a serial number next */
1923 if (!key_cert_is_legacy(k))
1924 buffer_put_int64(&k->cert->certblob, k->cert->serial);
1926 buffer_put_int(&k->cert->certblob, k->cert->type);
1927 buffer_put_cstring(&k->cert->certblob, k->cert->key_id);
1929 buffer_init(&principals);
1930 for (i = 0; i < k->cert->nprincipals; i++)
1931 buffer_put_cstring(&principals, k->cert->principals[i]);
1932 buffer_put_string(&k->cert->certblob, buffer_ptr(&principals),
1933 buffer_len(&principals));
1934 buffer_free(&principals);
1936 buffer_put_int64(&k->cert->certblob, k->cert->valid_after);
1937 buffer_put_int64(&k->cert->certblob, k->cert->valid_before);
1938 buffer_put_string(&k->cert->certblob,
1939 buffer_ptr(&k->cert->critical), buffer_len(&k->cert->critical));
1941 /* -v01 certs have non-critical options here */
1942 if (!key_cert_is_legacy(k)) {
1943 buffer_put_string(&k->cert->certblob,
1944 buffer_ptr(&k->cert->extensions),
1945 buffer_len(&k->cert->extensions));
1948 /* -v00 certs put the nonce at the end */
1949 if (key_cert_is_legacy(k))
1950 buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
1952 buffer_put_string(&k->cert->certblob, NULL, 0); /* reserved */
1953 buffer_put_string(&k->cert->certblob, ca_blob, ca_len);
1956 /* Sign the whole mess */
1957 if (key_sign(ca, &sig_blob, &sig_len, buffer_ptr(&k->cert->certblob),
1958 buffer_len(&k->cert->certblob)) != 0) {
1959 error("%s: signature operation failed", __func__);
1960 buffer_clear(&k->cert->certblob);
1963 /* Append signature and we are done */
1964 buffer_put_string(&k->cert->certblob, sig_blob, sig_len);
1971 key_cert_check_authority(const Key *k, int want_host, int require_principal,
1972 const char *name, const char **reason)
1974 u_int i, principal_matches;
1975 time_t now = time(NULL);
1978 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
1979 *reason = "Certificate invalid: not a host certificate";
1983 if (k->cert->type != SSH2_CERT_TYPE_USER) {
1984 *reason = "Certificate invalid: not a user certificate";
1989 error("%s: system clock lies before epoch", __func__);
1990 *reason = "Certificate invalid: not yet valid";
1993 if ((u_int64_t)now < k->cert->valid_after) {
1994 *reason = "Certificate invalid: not yet valid";
1997 if ((u_int64_t)now >= k->cert->valid_before) {
1998 *reason = "Certificate invalid: expired";
2001 if (k->cert->nprincipals == 0) {
2002 if (require_principal) {
2003 *reason = "Certificate lacks principal list";
2006 } else if (name != NULL) {
2007 principal_matches = 0;
2008 for (i = 0; i < k->cert->nprincipals; i++) {
2009 if (strcmp(name, k->cert->principals[i]) == 0) {
2010 principal_matches = 1;
2014 if (!principal_matches) {
2015 *reason = "Certificate invalid: name is not a listed "
2024 key_cert_is_legacy(Key *k)
2027 case KEY_DSA_CERT_V00:
2028 case KEY_RSA_CERT_V00:
2035 /* XXX: these are really begging for a table-driven approach */
2037 key_curve_name_to_nid(const char *name)
2039 #ifdef OPENSSL_HAS_ECC
2040 if (strcmp(name, "nistp256") == 0)
2041 return NID_X9_62_prime256v1;
2042 else if (strcmp(name, "nistp384") == 0)
2043 return NID_secp384r1;
2044 else if (strcmp(name, "nistp521") == 0)
2045 return NID_secp521r1;
2048 debug("%s: unsupported EC curve name \"%.100s\"", __func__, name);
2053 key_curve_nid_to_bits(int nid)
2056 #ifdef OPENSSL_HAS_ECC
2057 case NID_X9_62_prime256v1:
2065 error("%s: unsupported EC curve nid %d", __func__, nid);
2071 key_curve_nid_to_name(int nid)
2073 #ifdef OPENSSL_HAS_ECC
2074 if (nid == NID_X9_62_prime256v1)
2076 else if (nid == NID_secp384r1)
2078 else if (nid == NID_secp521r1)
2081 error("%s: unsupported EC curve nid %d", __func__, nid);
2085 #ifdef OPENSSL_HAS_ECC
2087 key_ec_nid_to_evpmd(int nid)
2089 int kbits = key_curve_nid_to_bits(nid);
2092 fatal("%s: invalid nid %d", __func__, nid);
2093 /* RFC5656 section 6.2.1 */
2095 return EVP_sha256();
2096 else if (kbits <= 384)
2097 return EVP_sha384();
2099 return EVP_sha512();
2103 key_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2106 EC_POINT *nq = NULL;
2107 BIGNUM *order, *x, *y, *tmp;
2110 if ((bnctx = BN_CTX_new()) == NULL)
2111 fatal("%s: BN_CTX_new failed", __func__);
2112 BN_CTX_start(bnctx);
2115 * We shouldn't ever hit this case because bignum_get_ecpoint()
2116 * refuses to load GF2m points.
2118 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2119 NID_X9_62_prime_field) {
2120 error("%s: group is not a prime field", __func__);
2125 if (EC_POINT_is_at_infinity(group, public)) {
2126 error("%s: received degenerate public key (infinity)",
2131 if ((x = BN_CTX_get(bnctx)) == NULL ||
2132 (y = BN_CTX_get(bnctx)) == NULL ||
2133 (order = BN_CTX_get(bnctx)) == NULL ||
2134 (tmp = BN_CTX_get(bnctx)) == NULL)
2135 fatal("%s: BN_CTX_get failed", __func__);
2137 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2138 if (EC_GROUP_get_order(group, order, bnctx) != 1)
2139 fatal("%s: EC_GROUP_get_order failed", __func__);
2140 if (EC_POINT_get_affine_coordinates_GFp(group, public,
2142 fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2143 if (BN_num_bits(x) <= BN_num_bits(order) / 2) {
2144 error("%s: public key x coordinate too small: "
2145 "bits(x) = %d, bits(order)/2 = %d", __func__,
2146 BN_num_bits(x), BN_num_bits(order) / 2);
2149 if (BN_num_bits(y) <= BN_num_bits(order) / 2) {
2150 error("%s: public key y coordinate too small: "
2151 "bits(y) = %d, bits(order)/2 = %d", __func__,
2152 BN_num_bits(x), BN_num_bits(order) / 2);
2156 /* nQ == infinity (n == order of subgroup) */
2157 if ((nq = EC_POINT_new(group)) == NULL)
2158 fatal("%s: BN_CTX_tmp failed", __func__);
2159 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1)
2160 fatal("%s: EC_GROUP_mul failed", __func__);
2161 if (EC_POINT_is_at_infinity(group, nq) != 1) {
2162 error("%s: received degenerate public key (nQ != infinity)",
2167 /* x < order - 1, y < order - 1 */
2168 if (!BN_sub(tmp, order, BN_value_one()))
2169 fatal("%s: BN_sub failed", __func__);
2170 if (BN_cmp(x, tmp) >= 0) {
2171 error("%s: public key x coordinate >= group order - 1",
2175 if (BN_cmp(y, tmp) >= 0) {
2176 error("%s: public key y coordinate >= group order - 1",
2188 key_ec_validate_private(const EC_KEY *key)
2191 BIGNUM *order, *tmp;
2194 if ((bnctx = BN_CTX_new()) == NULL)
2195 fatal("%s: BN_CTX_new failed", __func__);
2196 BN_CTX_start(bnctx);
2198 if ((order = BN_CTX_get(bnctx)) == NULL ||
2199 (tmp = BN_CTX_get(bnctx)) == NULL)
2200 fatal("%s: BN_CTX_get failed", __func__);
2202 /* log2(private) > log2(order)/2 */
2203 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1)
2204 fatal("%s: EC_GROUP_get_order failed", __func__);
2205 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2206 BN_num_bits(order) / 2) {
2207 error("%s: private key too small: "
2208 "bits(y) = %d, bits(order)/2 = %d", __func__,
2209 BN_num_bits(EC_KEY_get0_private_key(key)),
2210 BN_num_bits(order) / 2);
2214 /* private < order - 1 */
2215 if (!BN_sub(tmp, order, BN_value_one()))
2216 fatal("%s: BN_sub failed", __func__);
2217 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) {
2218 error("%s: private key >= group order - 1", __func__);
2227 #if defined(DEBUG_KEXECDH) || defined(DEBUG_PK)
2229 key_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2234 if (point == NULL) {
2235 fputs("point=(NULL)\n", stderr);
2238 if ((bnctx = BN_CTX_new()) == NULL)
2239 fatal("%s: BN_CTX_new failed", __func__);
2240 BN_CTX_start(bnctx);
2241 if ((x = BN_CTX_get(bnctx)) == NULL || (y = BN_CTX_get(bnctx)) == NULL)
2242 fatal("%s: BN_CTX_get failed", __func__);
2243 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2244 NID_X9_62_prime_field)
2245 fatal("%s: group is not a prime field", __func__);
2246 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, bnctx) != 1)
2247 fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2248 fputs("x=", stderr);
2249 BN_print_fp(stderr, x);
2250 fputs("\ny=", stderr);
2251 BN_print_fp(stderr, y);
2252 fputs("\n", stderr);
2257 key_dump_ec_key(const EC_KEY *key)
2259 const BIGNUM *exponent;
2261 key_dump_ec_point(EC_KEY_get0_group(key), EC_KEY_get0_public_key(key));
2262 fputs("exponent=", stderr);
2263 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2264 fputs("(NULL)", stderr);
2266 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2267 fputs("\n", stderr);
2269 #endif /* defined(DEBUG_KEXECDH) || defined(DEBUG_PK) */
2270 #endif /* OPENSSL_HAS_ECC */