Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.17
1.17 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.16 2022/10/28 00:41:52 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:
1.17 ! djm 104: static int
! 105: ssh_ed25519_sign(struct sshkey *key,
! 106: u_char **sigp, size_t *lenp,
! 107: const u_char *data, size_t datalen,
! 108: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 markus 109: {
1.4 djm 110: u_char *sig = NULL;
111: size_t slen = 0, len;
1.1 markus 112: unsigned long long smlen;
1.4 djm 113: int r, ret;
114: struct sshbuf *b = NULL;
1.1 markus 115:
1.4 djm 116: if (lenp != NULL)
117: *lenp = 0;
118: if (sigp != NULL)
119: *sigp = NULL;
120:
121: if (key == NULL ||
122: sshkey_type_plain(key->type) != KEY_ED25519 ||
123: key->ed25519_sk == NULL ||
124: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
125: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 126: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 127: if ((sig = malloc(slen)) == NULL)
128: return SSH_ERR_ALLOC_FAIL;
1.1 markus 129:
130: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
131: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 132: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
133: goto out;
1.1 markus 134: }
135: /* encode signature */
1.4 djm 136: if ((b = sshbuf_new()) == NULL) {
137: r = SSH_ERR_ALLOC_FAIL;
138: goto out;
139: }
140: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
141: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
142: goto out;
143: len = sshbuf_len(b);
144: if (sigp != NULL) {
145: if ((*sigp = malloc(len)) == NULL) {
146: r = SSH_ERR_ALLOC_FAIL;
147: goto out;
148: }
149: memcpy(*sigp, sshbuf_ptr(b), len);
150: }
1.1 markus 151: if (lenp != NULL)
152: *lenp = len;
1.4 djm 153: /* success */
154: r = 0;
155: out:
156: sshbuf_free(b);
1.10 djm 157: if (sig != NULL)
1.8 jsg 158: freezero(sig, slen);
1.1 markus 159:
1.4 djm 160: return r;
1.1 markus 161: }
162:
1.17 ! djm 163: static int
1.4 djm 164: ssh_ed25519_verify(const struct sshkey *key,
1.17 ! djm 165: const u_char *sig, size_t siglen,
! 166: const u_char *data, size_t dlen, const char *alg, u_int compat,
! 167: struct sshkey_sig_details **detailsp)
1.1 markus 168: {
1.4 djm 169: struct sshbuf *b = NULL;
170: char *ktype = NULL;
171: const u_char *sigblob;
172: u_char *sm = NULL, *m = NULL;
173: size_t len;
174: unsigned long long smlen = 0, mlen = 0;
175: int r, ret;
176:
177: if (key == NULL ||
178: sshkey_type_plain(key->type) != KEY_ED25519 ||
179: key->ed25519_pk == NULL ||
1.17 ! djm 180: dlen >= INT_MAX - crypto_sign_ed25519_BYTES ||
! 181: sig == NULL || siglen == 0)
1.4 djm 182: return SSH_ERR_INVALID_ARGUMENT;
183:
1.17 ! djm 184: if ((b = sshbuf_from(sig, siglen)) == NULL)
1.4 djm 185: return SSH_ERR_ALLOC_FAIL;
186: if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
187: (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
188: goto out;
1.1 markus 189: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 190: r = SSH_ERR_KEY_TYPE_MISMATCH;
191: goto out;
1.1 markus 192: }
1.4 djm 193: if (sshbuf_len(b) != 0) {
194: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
195: goto out;
1.1 markus 196: }
197: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 198: r = SSH_ERR_INVALID_FORMAT;
199: goto out;
1.1 markus 200: }
1.17 ! djm 201: if (dlen >= SIZE_MAX - len) {
1.5 daniel 202: r = SSH_ERR_INVALID_ARGUMENT;
203: goto out;
204: }
1.17 ! djm 205: smlen = len + dlen;
1.4 djm 206: mlen = smlen;
1.6 markus 207: if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
1.4 djm 208: r = SSH_ERR_ALLOC_FAIL;
209: goto out;
210: }
1.1 markus 211: memcpy(sm, sigblob, len);
1.17 ! djm 212: memcpy(sm+len, data, dlen);
1.1 markus 213: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
214: key->ed25519_pk)) != 0) {
1.9 djm 215: debug2_f("crypto_sign_ed25519_open failed: %d", ret);
1.1 markus 216: }
1.17 ! djm 217: if (ret != 0 || mlen != dlen) {
1.4 djm 218: r = SSH_ERR_SIGNATURE_INVALID;
219: goto out;
1.1 markus 220: }
221: /* XXX compare 'm' and 'data' ? */
1.4 djm 222: /* success */
223: r = 0;
224: out:
1.10 djm 225: if (sm != NULL)
1.8 jsg 226: freezero(sm, smlen);
1.10 djm 227: if (m != NULL)
1.8 jsg 228: freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
1.4 djm 229: sshbuf_free(b);
230: free(ktype);
231: return r;
232: }
1.11 djm 233:
1.12 djm 234: /* NB. not static; used by ED25519-SK */
235: const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
1.11 djm 236: /* .size = */ NULL,
237: /* .alloc = */ NULL,
238: /* .cleanup = */ ssh_ed25519_cleanup,
1.12 djm 239: /* .equal = */ ssh_ed25519_equal,
1.13 djm 240: /* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
1.16 djm 241: /* .ssh_deserialize_public = */ ssh_ed25519_deserialize_public,
1.14 djm 242: /* .generate = */ ssh_ed25519_generate,
1.15 djm 243: /* .copy_public = */ ssh_ed25519_copy_public,
1.17 ! djm 244: /* .sign = */ ssh_ed25519_sign,
! 245: /* .verify = */ ssh_ed25519_verify,
1.11 djm 246: };
247:
248: const struct sshkey_impl sshkey_ed25519_impl = {
249: /* .name = */ "ssh-ed25519",
250: /* .shortname = */ "ED25519",
251: /* .sigalg = */ NULL,
252: /* .type = */ KEY_ED25519,
253: /* .nid = */ 0,
254: /* .cert = */ 0,
255: /* .sigonly = */ 0,
256: /* .keybits = */ 256,
257: /* .funcs = */ &sshkey_ed25519_funcs,
258: };
259:
260: const struct sshkey_impl sshkey_ed25519_cert_impl = {
261: /* .name = */ "ssh-ed25519-cert-v01@openssh.com",
262: /* .shortname = */ "ED25519-CERT",
263: /* .sigalg = */ NULL,
264: /* .type = */ KEY_ED25519_CERT,
265: /* .nid = */ 0,
266: /* .cert = */ 1,
267: /* .sigonly = */ 0,
268: /* .keybits = */ 256,
269: /* .funcs = */ &sshkey_ed25519_funcs,
270: };
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