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1 /* $OpenBSD: sshkey.h,v 1.15 2017/03/10 04:07:20 djm Exp $ */
2 
3 /*
4  * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
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.
14  *
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.
25  */
26 #ifndef SSHKEY_H
27 #define SSHKEY_H
28 
29 #include <sys/types.h>
30 
31 #ifdef WITH_OPENSSL
32 #include <openssl/rsa.h>
33 #include <openssl/dsa.h>
34 # ifdef OPENSSL_HAS_ECC
35 #  include <openssl/ec.h>
36 # else /* OPENSSL_HAS_ECC */
37 #  define EC_KEY	void
38 #  define EC_GROUP	void
39 #  define EC_POINT	void
40 # endif /* OPENSSL_HAS_ECC */
41 #else /* WITH_OPENSSL */
42 # define RSA		void
43 # define DSA		void
44 # define EC_KEY		void
45 # define EC_GROUP	void
46 # define EC_POINT	void
47 #endif /* WITH_OPENSSL */
48 
49 #define SSH_RSA_MINIMUM_MODULUS_SIZE	768
50 #define SSH_KEY_MAX_SIGN_DATA_SIZE	(1 << 20)
51 
52 struct sshbuf;
53 
54 /* Key types */
55 enum sshkey_types {
56 	KEY_RSA1,
57 	KEY_RSA,
58 	KEY_DSA,
59 	KEY_ECDSA,
60 	KEY_ED25519,
61 	KEY_RSA_CERT,
62 	KEY_DSA_CERT,
63 	KEY_ECDSA_CERT,
64 	KEY_ED25519_CERT,
65 	KEY_UNSPEC
66 };
67 
68 /* Default fingerprint hash */
69 #define SSH_FP_HASH_DEFAULT	SSH_DIGEST_SHA256
70 
71 /* Fingerprint representation formats */
72 enum sshkey_fp_rep {
73 	SSH_FP_DEFAULT = 0,
74 	SSH_FP_HEX,
75 	SSH_FP_BASE64,
76 	SSH_FP_BUBBLEBABBLE,
77 	SSH_FP_RANDOMART
78 };
79 
80 /* key is stored in external hardware */
81 #define SSHKEY_FLAG_EXT		0x0001
82 
83 #define SSHKEY_CERT_MAX_PRINCIPALS	256
84 /* XXX opaquify? */
85 struct sshkey_cert {
86 	struct sshbuf	*certblob; /* Kept around for use on wire */
87 	u_int		 type; /* SSH2_CERT_TYPE_USER or SSH2_CERT_TYPE_HOST */
88 	u_int64_t	 serial;
89 	char		*key_id;
90 	u_int		 nprincipals;
91 	char		**principals;
92 	u_int64_t	 valid_after, valid_before;
93 	struct sshbuf	*critical;
94 	struct sshbuf	*extensions;
95 	struct sshkey	*signature_key;
96 };
97 
98 /* XXX opaquify? */
99 struct sshkey {
100 	int	 type;
101 	int	 flags;
102 	RSA	*rsa;
103 	DSA	*dsa;
104 	int	 ecdsa_nid;	/* NID of curve */
105 	EC_KEY	*ecdsa;
106 	u_char	*ed25519_sk;
107 	u_char	*ed25519_pk;
108 	struct sshkey_cert *cert;
109 };
110 
111 #define	ED25519_SK_SZ	crypto_sign_ed25519_SECRETKEYBYTES
112 #define	ED25519_PK_SZ	crypto_sign_ed25519_PUBLICKEYBYTES
113 
114 struct sshkey	*sshkey_new(int);
115 int		 sshkey_add_private(struct sshkey *);
116 struct sshkey	*sshkey_new_private(int);
117 void		 sshkey_free(struct sshkey *);
118 int		 sshkey_demote(const struct sshkey *, struct sshkey **);
119 int		 sshkey_equal_public(const struct sshkey *,
120     const struct sshkey *);
121 int		 sshkey_equal(const struct sshkey *, const struct sshkey *);
122 char		*sshkey_fingerprint(const struct sshkey *,
123     int, enum sshkey_fp_rep);
124 int		 sshkey_fingerprint_raw(const struct sshkey *k,
125     int, u_char **retp, size_t *lenp);
126 const char	*sshkey_type(const struct sshkey *);
127 const char	*sshkey_cert_type(const struct sshkey *);
128 int		 sshkey_write(const struct sshkey *, FILE *);
129 int		 sshkey_read(struct sshkey *, char **);
130 u_int		 sshkey_size(const struct sshkey *);
131 
132 int		 sshkey_generate(int type, u_int bits, struct sshkey **keyp);
133 int		 sshkey_from_private(const struct sshkey *, struct sshkey **);
134 int	 sshkey_type_from_name(const char *);
135 int	 sshkey_is_cert(const struct sshkey *);
136 int	 sshkey_type_is_cert(int);
137 int	 sshkey_type_plain(int);
138 int	 sshkey_to_certified(struct sshkey *);
139 int	 sshkey_drop_cert(struct sshkey *);
140 int	 sshkey_certify(struct sshkey *, struct sshkey *, const char *);
141 int	 sshkey_cert_copy(const struct sshkey *, struct sshkey *);
142 int	 sshkey_cert_check_authority(const struct sshkey *, int, int,
143     const char *, const char **);
144 size_t	 sshkey_format_cert_validity(const struct sshkey_cert *,
145     char *, size_t) __attribute__((__bounded__(__string__, 2, 3)));
146 
147 int		 sshkey_ecdsa_nid_from_name(const char *);
148 int		 sshkey_curve_name_to_nid(const char *);
149 const char *	 sshkey_curve_nid_to_name(int);
150 u_int		 sshkey_curve_nid_to_bits(int);
151 int		 sshkey_ecdsa_bits_to_nid(int);
152 int		 sshkey_ecdsa_key_to_nid(EC_KEY *);
153 int		 sshkey_ec_nid_to_hash_alg(int nid);
154 int		 sshkey_ec_validate_public(const EC_GROUP *, const EC_POINT *);
155 int		 sshkey_ec_validate_private(const EC_KEY *);
156 const char	*sshkey_ssh_name(const struct sshkey *);
157 const char	*sshkey_ssh_name_plain(const struct sshkey *);
158 int		 sshkey_names_valid2(const char *, int);
159 char		*sshkey_alg_list(int, int, int, char);
160 
161 int	 sshkey_from_blob(const u_char *, size_t, struct sshkey **);
162 int	 sshkey_fromb(struct sshbuf *, struct sshkey **);
163 int	 sshkey_froms(struct sshbuf *, struct sshkey **);
164 int	 sshkey_to_blob(const struct sshkey *, u_char **, size_t *);
165 int	 sshkey_to_base64(const struct sshkey *, char **);
166 int	 sshkey_putb(const struct sshkey *, struct sshbuf *);
167 int	 sshkey_puts(const struct sshkey *, struct sshbuf *);
168 int	 sshkey_plain_to_blob(const struct sshkey *, u_char **, size_t *);
169 int	 sshkey_putb_plain(const struct sshkey *, struct sshbuf *);
170 
171 int	 sshkey_sign(const struct sshkey *, u_char **, size_t *,
172     const u_char *, size_t, const char *, u_int);
173 int	 sshkey_verify(const struct sshkey *, const u_char *, size_t,
174     const u_char *, size_t, u_int);
175 
176 /* for debug */
177 void	sshkey_dump_ec_point(const EC_GROUP *, const EC_POINT *);
178 void	sshkey_dump_ec_key(const EC_KEY *);
179 
180 /* private key parsing and serialisation */
181 int	sshkey_private_serialize(const struct sshkey *key, struct sshbuf *buf);
182 int	sshkey_private_deserialize(struct sshbuf *buf,  struct sshkey **keyp);
183 
184 /* private key file format parsing and serialisation */
185 int	sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
186     const char *passphrase, const char *comment,
187     int force_new_format, const char *new_format_cipher, int new_format_rounds);
188 int	sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
189     struct sshkey **keyp, char **commentp);
190 int	sshkey_parse_private_fileblob(struct sshbuf *buffer,
191     const char *passphrase, struct sshkey **keyp, char **commentp);
192 int	sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
193     const char *passphrase, struct sshkey **keyp, char **commentp);
194 
195 #ifdef SSHKEY_INTERNAL
196 int ssh_rsa_sign(const struct sshkey *key,
197     u_char **sigp, size_t *lenp, const u_char *data, size_t datalen,
198     const char *ident);
199 int ssh_rsa_verify(const struct sshkey *key,
200     const u_char *sig, size_t siglen, const u_char *data, size_t datalen);
201 int ssh_dss_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
202     const u_char *data, size_t datalen, u_int compat);
203 int ssh_dss_verify(const struct sshkey *key,
204     const u_char *signature, size_t signaturelen,
205     const u_char *data, size_t datalen, u_int compat);
206 int ssh_ecdsa_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
207     const u_char *data, size_t datalen, u_int compat);
208 int ssh_ecdsa_verify(const struct sshkey *key,
209     const u_char *signature, size_t signaturelen,
210     const u_char *data, size_t datalen, u_int compat);
211 int ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
212     const u_char *data, size_t datalen, u_int compat);
213 int ssh_ed25519_verify(const struct sshkey *key,
214     const u_char *signature, size_t signaturelen,
215     const u_char *data, size_t datalen, u_int compat);
216 #endif
217 
218 #if !defined(WITH_OPENSSL)
219 # undef RSA
220 # undef DSA
221 # undef EC_KEY
222 # undef EC_GROUP
223 # undef EC_POINT
224 #elif !defined(OPENSSL_HAS_ECC)
225 # undef EC_KEY
226 # undef EC_GROUP
227 # undef EC_POINT
228 #endif
229 
230 #endif /* SSHKEY_H */
231