1 /* $OpenBSD: sshkey.h,v 1.61 2022/10/28 00:44:44 djm Exp $ */
4 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/types.h>
32 #include <openssl/rsa.h>
33 #include <openssl/dsa.h>
34 # ifdef OPENSSL_HAS_ECC
35 # include <openssl/ec.h>
36 # include <openssl/ecdsa.h>
37 # else /* OPENSSL_HAS_ECC */
39 # define EC_GROUP void
40 # define EC_POINT void
41 # endif /* OPENSSL_HAS_ECC */
42 #define SSH_OPENSSL_VERSION OpenSSL_version(OPENSSL_VERSION)
43 #else /* WITH_OPENSSL */
48 # define EC_GROUP void
49 # define EC_POINT void
50 #define SSH_OPENSSL_VERSION "without OpenSSL"
51 #endif /* WITH_OPENSSL */
53 #define SSH_RSA_MINIMUM_MODULUS_SIZE 1024
54 #define SSH_KEY_MAX_SIGN_DATA_SIZE (1 << 20)
77 /* Default fingerprint hash */
78 #define SSH_FP_HASH_DEFAULT SSH_DIGEST_SHA256
80 /* Fingerprint representation formats */
89 /* Private key serialisation formats, used on the wire */
90 enum sshkey_serialize_rep {
91 SSHKEY_SERIALIZE_DEFAULT = 0,
92 SSHKEY_SERIALIZE_STATE = 1, /* only state is serialized */
93 SSHKEY_SERIALIZE_FULL = 2, /* include keys for saving to disk */
94 SSHKEY_SERIALIZE_SHIELD = 3, /* everything, for encrypting in ram */
95 SSHKEY_SERIALIZE_INFO = 254, /* minimal information */
98 /* Private key disk formats */
99 enum sshkey_private_format {
100 SSHKEY_PRIVATE_OPENSSH = 0,
101 SSHKEY_PRIVATE_PEM = 1,
102 SSHKEY_PRIVATE_PKCS8 = 2,
105 /* key is stored in external hardware */
106 #define SSHKEY_FLAG_EXT 0x0001
108 #define SSHKEY_CERT_MAX_PRINCIPALS 256
111 struct sshbuf *certblob; /* Kept around for use on wire */
112 u_int type; /* SSH2_CERT_TYPE_USER or SSH2_CERT_TYPE_HOST */
117 u_int64_t valid_after, valid_before;
118 struct sshbuf *critical;
119 struct sshbuf *extensions;
120 struct sshkey *signature_key;
121 char *signature_type;
132 /* KEY_ECDSA and KEY_ECDSA_SK */
133 int ecdsa_nid; /* NID of curve */
135 /* KEY_ED25519 and KEY_ED25519_SK */
140 char *xmss_filename; /* for state file updates */
141 void *xmss_state; /* depends on xmss_name, opaque */
144 /* KEY_ECDSA_SK and KEY_ED25519_SK */
145 char *sk_application;
147 struct sshbuf *sk_key_handle;
148 struct sshbuf *sk_reserved;
150 struct sshkey_cert *cert;
151 /* Private key shielding */
152 u_char *shielded_private;
154 u_char *shield_prekey;
155 size_t shield_prekey_len;
158 #define ED25519_SK_SZ crypto_sign_ed25519_SECRETKEYBYTES
159 #define ED25519_PK_SZ crypto_sign_ed25519_PUBLICKEYBYTES
161 /* Additional fields contained in signature */
162 struct sshkey_sig_details {
163 uint32_t sk_counter; /* U2F signature counter */
164 uint8_t sk_flags; /* U2F signature flags; see ssh-sk.h */
167 struct sshkey_impl_funcs {
168 u_int (*size)(const struct sshkey *); /* optional */
169 int (*alloc)(struct sshkey *); /* optional */
170 void (*cleanup)(struct sshkey *); /* optional */
171 int (*equal)(const struct sshkey *, const struct sshkey *);
172 int (*serialize_public)(const struct sshkey *, struct sshbuf *,
173 enum sshkey_serialize_rep);
174 int (*deserialize_public)(const char *, struct sshbuf *,
176 int (*serialize_private)(const struct sshkey *, struct sshbuf *,
177 enum sshkey_serialize_rep);
178 int (*deserialize_private)(const char *, struct sshbuf *,
180 int (*generate)(struct sshkey *, int); /* optional */
181 int (*copy_public)(const struct sshkey *, struct sshkey *);
182 int (*sign)(struct sshkey *, u_char **, size_t *,
183 const u_char *, size_t, const char *,
184 const char *, const char *, u_int); /* optional */
185 int (*verify)(const struct sshkey *, const u_char *, size_t,
186 const u_char *, size_t, const char *, u_int,
187 struct sshkey_sig_details **);
192 const char *shortname;
199 const struct sshkey_impl_funcs *funcs;
202 struct sshkey *sshkey_new(int);
203 void sshkey_free(struct sshkey *);
204 int sshkey_equal_public(const struct sshkey *,
205 const struct sshkey *);
206 int sshkey_equal(const struct sshkey *, const struct sshkey *);
207 char *sshkey_fingerprint(const struct sshkey *,
208 int, enum sshkey_fp_rep);
209 int sshkey_fingerprint_raw(const struct sshkey *k,
210 int, u_char **retp, size_t *lenp);
211 const char *sshkey_type(const struct sshkey *);
212 const char *sshkey_cert_type(const struct sshkey *);
213 int sshkey_format_text(const struct sshkey *, struct sshbuf *);
214 int sshkey_write(const struct sshkey *, FILE *);
215 int sshkey_read(struct sshkey *, char **);
216 u_int sshkey_size(const struct sshkey *);
218 int sshkey_generate(int type, u_int bits, struct sshkey **keyp);
219 int sshkey_from_private(const struct sshkey *, struct sshkey **);
221 int sshkey_is_shielded(struct sshkey *);
222 int sshkey_shield_private(struct sshkey *);
223 int sshkey_unshield_private(struct sshkey *);
225 int sshkey_type_from_name(const char *);
226 int sshkey_is_cert(const struct sshkey *);
227 int sshkey_is_sk(const struct sshkey *);
228 int sshkey_type_is_cert(int);
229 int sshkey_type_plain(int);
231 /* Returns non-zero if key name match sigalgs pattern list. (handles RSA) */
232 int sshkey_match_keyname_to_sigalgs(const char *, const char *);
234 int sshkey_to_certified(struct sshkey *);
235 int sshkey_drop_cert(struct sshkey *);
236 int sshkey_cert_copy(const struct sshkey *, struct sshkey *);
237 int sshkey_cert_check_authority(const struct sshkey *, int, int, int,
238 uint64_t, const char *, const char **);
239 int sshkey_cert_check_authority_now(const struct sshkey *, int, int, int,
240 const char *, const char **);
241 int sshkey_cert_check_host(const struct sshkey *, const char *,
242 int , const char *, const char **);
243 size_t sshkey_format_cert_validity(const struct sshkey_cert *,
244 char *, size_t) __attribute__((__bounded__(__string__, 2, 3)));
245 int sshkey_check_cert_sigtype(const struct sshkey *, const char *);
247 int sshkey_certify(struct sshkey *, struct sshkey *,
248 const char *, const char *, const char *);
249 /* Variant allowing use of a custom signature function (e.g. for ssh-agent) */
250 typedef int sshkey_certify_signer(struct sshkey *, u_char **, size_t *,
251 const u_char *, size_t, const char *, const char *, const char *,
253 int sshkey_certify_custom(struct sshkey *, struct sshkey *, const char *,
254 const char *, const char *, sshkey_certify_signer *, void *);
256 int sshkey_ecdsa_nid_from_name(const char *);
257 int sshkey_curve_name_to_nid(const char *);
258 const char * sshkey_curve_nid_to_name(int);
259 u_int sshkey_curve_nid_to_bits(int);
260 int sshkey_ecdsa_bits_to_nid(int);
261 int sshkey_ecdsa_key_to_nid(EC_KEY *);
262 int sshkey_ec_nid_to_hash_alg(int nid);
263 int sshkey_ec_validate_public(const EC_GROUP *, const EC_POINT *);
264 int sshkey_ec_validate_private(const EC_KEY *);
265 const char *sshkey_ssh_name(const struct sshkey *);
266 const char *sshkey_ssh_name_plain(const struct sshkey *);
267 int sshkey_names_valid2(const char *, int);
268 char *sshkey_alg_list(int, int, int, char);
270 int sshkey_from_blob(const u_char *, size_t, struct sshkey **);
271 int sshkey_fromb(struct sshbuf *, struct sshkey **);
272 int sshkey_froms(struct sshbuf *, struct sshkey **);
273 int sshkey_to_blob(const struct sshkey *, u_char **, size_t *);
274 int sshkey_to_base64(const struct sshkey *, char **);
275 int sshkey_putb(const struct sshkey *, struct sshbuf *);
276 int sshkey_puts(const struct sshkey *, struct sshbuf *);
277 int sshkey_puts_opts(const struct sshkey *, struct sshbuf *,
278 enum sshkey_serialize_rep);
279 int sshkey_plain_to_blob(const struct sshkey *, u_char **, size_t *);
280 int sshkey_putb_plain(const struct sshkey *, struct sshbuf *);
282 int sshkey_sign(struct sshkey *, u_char **, size_t *,
283 const u_char *, size_t, const char *, const char *, const char *, u_int);
284 int sshkey_verify(const struct sshkey *, const u_char *, size_t,
285 const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);
286 int sshkey_check_sigtype(const u_char *, size_t, const char *);
287 const char *sshkey_sigalg_by_name(const char *);
288 int sshkey_get_sigtype(const u_char *, size_t, char **);
291 void sshkey_dump_ec_point(const EC_GROUP *, const EC_POINT *);
292 void sshkey_dump_ec_key(const EC_KEY *);
294 /* private key parsing and serialisation */
295 int sshkey_private_serialize(struct sshkey *key, struct sshbuf *buf);
296 int sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
297 enum sshkey_serialize_rep);
298 int sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **keyp);
300 /* private key file format parsing and serialisation */
301 int sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
302 const char *passphrase, const char *comment,
303 int format, const char *openssh_format_cipher, int openssh_format_rounds);
304 int sshkey_parse_private_fileblob(struct sshbuf *buffer,
305 const char *passphrase, struct sshkey **keyp, char **commentp);
306 int sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
307 const char *passphrase, struct sshkey **keyp, char **commentp);
308 int sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob,
309 int type, struct sshkey **pubkeyp);
311 int sshkey_check_rsa_length(const struct sshkey *, int);
312 /* XXX should be internal, but used by ssh-keygen */
313 int ssh_rsa_complete_crt_parameters(struct sshkey *, const BIGNUM *);
315 /* stateful keys (e.g. XMSS) */
316 int sshkey_set_filename(struct sshkey *, const char *);
317 int sshkey_enable_maxsign(struct sshkey *, u_int32_t);
318 u_int32_t sshkey_signatures_left(const struct sshkey *);
319 int sshkey_forward_state(const struct sshkey *, u_int32_t, int);
320 int sshkey_private_serialize_maxsign(struct sshkey *key,
321 struct sshbuf *buf, u_int32_t maxsign, int);
323 void sshkey_sig_details_free(struct sshkey_sig_details *);
325 #ifdef SSHKEY_INTERNAL
326 int sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b);
327 void sshkey_sk_cleanup(struct sshkey *k);
328 int sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b);
329 int sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to);
330 int sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key);
331 int sshkey_serialize_private_sk(const struct sshkey *key,
333 int sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k);
335 int check_rsa_length(const RSA *rsa); /* XXX remove */
339 #if !defined(WITH_OPENSSL)
345 #elif !defined(OPENSSL_HAS_ECC)
351 #endif /* SSHKEY_H */