Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.13
1.13 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.12 2022/10/28 00:36:31 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,
! 53: const char *typename, enum sshkey_serialize_rep opts)
! 54: {
! 55: int r;
! 56:
! 57: if (key->ed25519_pk == NULL)
! 58: return SSH_ERR_INVALID_ARGUMENT;
! 59: if ((r = sshbuf_put_cstring(b, typename)) != 0 ||
! 60: (r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
! 61: return r;
! 62:
! 63: return 0;
! 64: }
! 65:
1.1 markus 66: int
1.4 djm 67: ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
68: const u_char *data, size_t datalen, u_int compat)
1.1 markus 69: {
1.4 djm 70: u_char *sig = NULL;
71: size_t slen = 0, len;
1.1 markus 72: unsigned long long smlen;
1.4 djm 73: int r, ret;
74: struct sshbuf *b = NULL;
1.1 markus 75:
1.4 djm 76: if (lenp != NULL)
77: *lenp = 0;
78: if (sigp != NULL)
79: *sigp = NULL;
80:
81: if (key == NULL ||
82: sshkey_type_plain(key->type) != KEY_ED25519 ||
83: key->ed25519_sk == NULL ||
84: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
85: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 86: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 87: if ((sig = malloc(slen)) == NULL)
88: return SSH_ERR_ALLOC_FAIL;
1.1 markus 89:
90: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
91: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 92: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
93: goto out;
1.1 markus 94: }
95: /* encode signature */
1.4 djm 96: if ((b = sshbuf_new()) == NULL) {
97: r = SSH_ERR_ALLOC_FAIL;
98: goto out;
99: }
100: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
101: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
102: goto out;
103: len = sshbuf_len(b);
104: if (sigp != NULL) {
105: if ((*sigp = malloc(len)) == NULL) {
106: r = SSH_ERR_ALLOC_FAIL;
107: goto out;
108: }
109: memcpy(*sigp, sshbuf_ptr(b), len);
110: }
1.1 markus 111: if (lenp != NULL)
112: *lenp = len;
1.4 djm 113: /* success */
114: r = 0;
115: out:
116: sshbuf_free(b);
1.10 djm 117: if (sig != NULL)
1.8 jsg 118: freezero(sig, slen);
1.1 markus 119:
1.4 djm 120: return r;
1.1 markus 121: }
122:
123: int
1.4 djm 124: ssh_ed25519_verify(const struct sshkey *key,
125: const u_char *signature, size_t signaturelen,
126: const u_char *data, size_t datalen, u_int compat)
1.1 markus 127: {
1.4 djm 128: struct sshbuf *b = NULL;
129: char *ktype = NULL;
130: const u_char *sigblob;
131: u_char *sm = NULL, *m = NULL;
132: size_t len;
133: unsigned long long smlen = 0, mlen = 0;
134: int r, ret;
135:
136: if (key == NULL ||
137: sshkey_type_plain(key->type) != KEY_ED25519 ||
138: key->ed25519_pk == NULL ||
1.7 djm 139: datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
140: signature == NULL || signaturelen == 0)
1.4 djm 141: return SSH_ERR_INVALID_ARGUMENT;
142:
143: if ((b = sshbuf_from(signature, signaturelen)) == NULL)
144: return SSH_ERR_ALLOC_FAIL;
145: if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
146: (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
147: goto out;
1.1 markus 148: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 149: r = SSH_ERR_KEY_TYPE_MISMATCH;
150: goto out;
1.1 markus 151: }
1.4 djm 152: if (sshbuf_len(b) != 0) {
153: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
154: goto out;
1.1 markus 155: }
156: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 157: r = SSH_ERR_INVALID_FORMAT;
158: goto out;
1.1 markus 159: }
1.5 daniel 160: if (datalen >= SIZE_MAX - len) {
161: r = SSH_ERR_INVALID_ARGUMENT;
162: goto out;
163: }
1.1 markus 164: smlen = len + datalen;
1.4 djm 165: mlen = smlen;
1.6 markus 166: if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
1.4 djm 167: r = SSH_ERR_ALLOC_FAIL;
168: goto out;
169: }
1.1 markus 170: memcpy(sm, sigblob, len);
171: memcpy(sm+len, data, datalen);
172: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
173: key->ed25519_pk)) != 0) {
1.9 djm 174: debug2_f("crypto_sign_ed25519_open failed: %d", ret);
1.1 markus 175: }
1.4 djm 176: if (ret != 0 || mlen != datalen) {
177: r = SSH_ERR_SIGNATURE_INVALID;
178: goto out;
1.1 markus 179: }
180: /* XXX compare 'm' and 'data' ? */
1.4 djm 181: /* success */
182: r = 0;
183: out:
1.10 djm 184: if (sm != NULL)
1.8 jsg 185: freezero(sm, smlen);
1.10 djm 186: if (m != NULL)
1.8 jsg 187: freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
1.4 djm 188: sshbuf_free(b);
189: free(ktype);
190: return r;
191: }
1.11 djm 192:
1.12 djm 193: /* NB. not static; used by ED25519-SK */
194: const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
1.11 djm 195: /* .size = */ NULL,
196: /* .alloc = */ NULL,
197: /* .cleanup = */ ssh_ed25519_cleanup,
1.12 djm 198: /* .equal = */ ssh_ed25519_equal,
1.13 ! djm 199: /* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
1.11 djm 200: };
201:
202: const struct sshkey_impl sshkey_ed25519_impl = {
203: /* .name = */ "ssh-ed25519",
204: /* .shortname = */ "ED25519",
205: /* .sigalg = */ NULL,
206: /* .type = */ KEY_ED25519,
207: /* .nid = */ 0,
208: /* .cert = */ 0,
209: /* .sigonly = */ 0,
210: /* .keybits = */ 256,
211: /* .funcs = */ &sshkey_ed25519_funcs,
212: };
213:
214: const struct sshkey_impl sshkey_ed25519_cert_impl = {
215: /* .name = */ "ssh-ed25519-cert-v01@openssh.com",
216: /* .shortname = */ "ED25519-CERT",
217: /* .sigalg = */ NULL,
218: /* .type = */ KEY_ED25519_CERT,
219: /* .nid = */ 0,
220: /* .cert = */ 1,
221: /* .sigonly = */ 0,
222: /* .keybits = */ 256,
223: /* .funcs = */ &sshkey_ed25519_funcs,
224: };
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