Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.16
1.16 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.15 2022/10/28 00:41:17 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2013 Markus Friedl <markus@openbsd.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
1.4 djm 17: #define SSHKEY_INTERNAL
1.1 markus 18: #include <sys/types.h>
1.4 djm 19: #include <limits.h>
1.1 markus 20:
21: #include "crypto_api.h"
22:
23: #include <string.h>
24: #include <stdarg.h>
25:
26: #include "log.h"
1.6 markus 27: #include "sshbuf.h"
1.4 djm 28: #include "sshkey.h"
29: #include "ssherr.h"
1.1 markus 30: #include "ssh.h"
31:
1.11 djm 32: static void
33: ssh_ed25519_cleanup(struct sshkey *k)
34: {
35: freezero(k->ed25519_pk, ED25519_PK_SZ);
36: freezero(k->ed25519_sk, ED25519_SK_SZ);
37: k->ed25519_pk = NULL;
38: k->ed25519_sk = NULL;
39: }
40:
1.12 djm 41: static int
42: ssh_ed25519_equal(const struct sshkey *a, const struct sshkey *b)
43: {
44: if (a->ed25519_pk == NULL || b->ed25519_pk == NULL)
45: return 0;
46: if (memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) != 0)
47: return 0;
48: return 1;
49: }
50:
1.13 djm 51: static int
52: ssh_ed25519_serialize_public(const struct sshkey *key, struct sshbuf *b,
1.16 ! djm 53: enum sshkey_serialize_rep opts)
1.13 djm 54: {
55: int r;
56:
57: if (key->ed25519_pk == NULL)
58: return SSH_ERR_INVALID_ARGUMENT;
1.16 ! djm 59: if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
1.13 djm 60: return r;
61:
62: return 0;
63: }
64:
1.14 djm 65: static int
66: ssh_ed25519_generate(struct sshkey *k, int bits)
67: {
68: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
69: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL)
70: return SSH_ERR_ALLOC_FAIL;
71: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
72: return 0;
73: }
74:
1.15 djm 75: static int
76: ssh_ed25519_copy_public(const struct sshkey *from, struct sshkey *to)
77: {
78: if (from->ed25519_pk == NULL)
79: return 0; /* XXX SSH_ERR_INTERNAL_ERROR ? */
80: if ((to->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL)
81: return SSH_ERR_ALLOC_FAIL;
82: memcpy(to->ed25519_pk, from->ed25519_pk, ED25519_PK_SZ);
83: return 0;
84: }
85:
1.16 ! djm 86: static int
! 87: ssh_ed25519_deserialize_public(const char *ktype, struct sshbuf *b,
! 88: struct sshkey *key)
! 89: {
! 90: u_char *pk = NULL;
! 91: size_t len = 0;
! 92: int r;
! 93:
! 94: if ((r = sshbuf_get_string(b, &pk, &len)) != 0)
! 95: return r;
! 96: if (len != ED25519_PK_SZ) {
! 97: freezero(pk, len);
! 98: return SSH_ERR_INVALID_FORMAT;
! 99: }
! 100: key->ed25519_pk = pk;
! 101: return 0;
! 102: }
! 103:
1.1 markus 104: int
1.4 djm 105: ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
106: const u_char *data, size_t datalen, u_int compat)
1.1 markus 107: {
1.4 djm 108: u_char *sig = NULL;
109: size_t slen = 0, len;
1.1 markus 110: unsigned long long smlen;
1.4 djm 111: int r, ret;
112: struct sshbuf *b = NULL;
1.1 markus 113:
1.4 djm 114: if (lenp != NULL)
115: *lenp = 0;
116: if (sigp != NULL)
117: *sigp = NULL;
118:
119: if (key == NULL ||
120: sshkey_type_plain(key->type) != KEY_ED25519 ||
121: key->ed25519_sk == NULL ||
122: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
123: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 124: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 125: if ((sig = malloc(slen)) == NULL)
126: return SSH_ERR_ALLOC_FAIL;
1.1 markus 127:
128: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
129: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 130: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
131: goto out;
1.1 markus 132: }
133: /* encode signature */
1.4 djm 134: if ((b = sshbuf_new()) == NULL) {
135: r = SSH_ERR_ALLOC_FAIL;
136: goto out;
137: }
138: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
139: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
140: goto out;
141: len = sshbuf_len(b);
142: if (sigp != NULL) {
143: if ((*sigp = malloc(len)) == NULL) {
144: r = SSH_ERR_ALLOC_FAIL;
145: goto out;
146: }
147: memcpy(*sigp, sshbuf_ptr(b), len);
148: }
1.1 markus 149: if (lenp != NULL)
150: *lenp = len;
1.4 djm 151: /* success */
152: r = 0;
153: out:
154: sshbuf_free(b);
1.10 djm 155: if (sig != NULL)
1.8 jsg 156: freezero(sig, slen);
1.1 markus 157:
1.4 djm 158: return r;
1.1 markus 159: }
160:
161: int
1.4 djm 162: ssh_ed25519_verify(const struct sshkey *key,
163: const u_char *signature, size_t signaturelen,
164: const u_char *data, size_t datalen, u_int compat)
1.1 markus 165: {
1.4 djm 166: struct sshbuf *b = NULL;
167: char *ktype = NULL;
168: const u_char *sigblob;
169: u_char *sm = NULL, *m = NULL;
170: size_t len;
171: unsigned long long smlen = 0, mlen = 0;
172: int r, ret;
173:
174: if (key == NULL ||
175: sshkey_type_plain(key->type) != KEY_ED25519 ||
176: key->ed25519_pk == NULL ||
1.7 djm 177: datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
178: signature == NULL || signaturelen == 0)
1.4 djm 179: return SSH_ERR_INVALID_ARGUMENT;
180:
181: if ((b = sshbuf_from(signature, signaturelen)) == NULL)
182: return SSH_ERR_ALLOC_FAIL;
183: if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
184: (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
185: goto out;
1.1 markus 186: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 187: r = SSH_ERR_KEY_TYPE_MISMATCH;
188: goto out;
1.1 markus 189: }
1.4 djm 190: if (sshbuf_len(b) != 0) {
191: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
192: goto out;
1.1 markus 193: }
194: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 195: r = SSH_ERR_INVALID_FORMAT;
196: goto out;
1.1 markus 197: }
1.5 daniel 198: if (datalen >= SIZE_MAX - len) {
199: r = SSH_ERR_INVALID_ARGUMENT;
200: goto out;
201: }
1.1 markus 202: smlen = len + datalen;
1.4 djm 203: mlen = smlen;
1.6 markus 204: if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
1.4 djm 205: r = SSH_ERR_ALLOC_FAIL;
206: goto out;
207: }
1.1 markus 208: memcpy(sm, sigblob, len);
209: memcpy(sm+len, data, datalen);
210: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
211: key->ed25519_pk)) != 0) {
1.9 djm 212: debug2_f("crypto_sign_ed25519_open failed: %d", ret);
1.1 markus 213: }
1.4 djm 214: if (ret != 0 || mlen != datalen) {
215: r = SSH_ERR_SIGNATURE_INVALID;
216: goto out;
1.1 markus 217: }
218: /* XXX compare 'm' and 'data' ? */
1.4 djm 219: /* success */
220: r = 0;
221: out:
1.10 djm 222: if (sm != NULL)
1.8 jsg 223: freezero(sm, smlen);
1.10 djm 224: if (m != NULL)
1.8 jsg 225: freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
1.4 djm 226: sshbuf_free(b);
227: free(ktype);
228: return r;
229: }
1.11 djm 230:
1.12 djm 231: /* NB. not static; used by ED25519-SK */
232: const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
1.11 djm 233: /* .size = */ NULL,
234: /* .alloc = */ NULL,
235: /* .cleanup = */ ssh_ed25519_cleanup,
1.12 djm 236: /* .equal = */ ssh_ed25519_equal,
1.13 djm 237: /* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
1.16 ! djm 238: /* .ssh_deserialize_public = */ ssh_ed25519_deserialize_public,
1.14 djm 239: /* .generate = */ ssh_ed25519_generate,
1.15 djm 240: /* .copy_public = */ ssh_ed25519_copy_public,
1.11 djm 241: };
242:
243: const struct sshkey_impl sshkey_ed25519_impl = {
244: /* .name = */ "ssh-ed25519",
245: /* .shortname = */ "ED25519",
246: /* .sigalg = */ NULL,
247: /* .type = */ KEY_ED25519,
248: /* .nid = */ 0,
249: /* .cert = */ 0,
250: /* .sigonly = */ 0,
251: /* .keybits = */ 256,
252: /* .funcs = */ &sshkey_ed25519_funcs,
253: };
254:
255: const struct sshkey_impl sshkey_ed25519_cert_impl = {
256: /* .name = */ "ssh-ed25519-cert-v01@openssh.com",
257: /* .shortname = */ "ED25519-CERT",
258: /* .sigalg = */ NULL,
259: /* .type = */ KEY_ED25519_CERT,
260: /* .nid = */ 0,
261: /* .cert = */ 1,
262: /* .sigonly = */ 0,
263: /* .keybits = */ 256,
264: /* .funcs = */ &sshkey_ed25519_funcs,
265: };
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