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Diffstat (limited to 'sshkey.h')
| -rw-r--r-- | sshkey.h | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/sshkey.h b/sshkey.h new file mode 100644 index 0000000..708f2da --- /dev/null +++ b/sshkey.h @@ -0,0 +1,351 @@ +/* $OpenBSD: sshkey.h,v 1.62 2023/06/21 05:10:26 djm Exp $ */ + +/* + * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#ifndef SSHKEY_H +#define SSHKEY_H + +#include <sys/types.h> + +#ifdef WITH_OPENSSL +#include <openssl/rsa.h> +#include <openssl/dsa.h> +# ifdef OPENSSL_HAS_ECC +# include <openssl/ec.h> +# include <openssl/ecdsa.h> +# else /* OPENSSL_HAS_ECC */ +# define EC_KEY void +# define EC_GROUP void +# define EC_POINT void +# endif /* OPENSSL_HAS_ECC */ +#define SSH_OPENSSL_VERSION OpenSSL_version(OPENSSL_VERSION) +#else /* WITH_OPENSSL */ +# define BIGNUM void +# define RSA void +# define DSA void +# define EC_KEY void +# define EC_GROUP void +# define EC_POINT void +#define SSH_OPENSSL_VERSION "without OpenSSL" +#endif /* WITH_OPENSSL */ + +#define SSH_RSA_MINIMUM_MODULUS_SIZE 1024 +#define SSH_KEY_MAX_SIGN_DATA_SIZE (1 << 20) + +struct sshbuf; + +/* Key types */ +enum sshkey_types { + KEY_RSA, + KEY_DSA, + KEY_ECDSA, + KEY_ED25519, + KEY_RSA_CERT, + KEY_DSA_CERT, + KEY_ECDSA_CERT, + KEY_ED25519_CERT, + KEY_XMSS, + KEY_XMSS_CERT, + KEY_ECDSA_SK, + KEY_ECDSA_SK_CERT, + KEY_ED25519_SK, + KEY_ED25519_SK_CERT, + KEY_UNSPEC +}; + +/* Default fingerprint hash */ +#define SSH_FP_HASH_DEFAULT SSH_DIGEST_SHA256 + +/* Fingerprint representation formats */ +enum sshkey_fp_rep { + SSH_FP_DEFAULT = 0, + SSH_FP_HEX, + SSH_FP_BASE64, + SSH_FP_BUBBLEBABBLE, + SSH_FP_RANDOMART +}; + +/* Private key serialisation formats, used on the wire */ +enum sshkey_serialize_rep { + SSHKEY_SERIALIZE_DEFAULT = 0, + SSHKEY_SERIALIZE_STATE = 1, /* only state is serialized */ + SSHKEY_SERIALIZE_FULL = 2, /* include keys for saving to disk */ + SSHKEY_SERIALIZE_SHIELD = 3, /* everything, for encrypting in ram */ + SSHKEY_SERIALIZE_INFO = 254, /* minimal information */ +}; + +/* Private key disk formats */ +enum sshkey_private_format { + SSHKEY_PRIVATE_OPENSSH = 0, + SSHKEY_PRIVATE_PEM = 1, + SSHKEY_PRIVATE_PKCS8 = 2, +}; + +/* key is stored in external hardware */ +#define SSHKEY_FLAG_EXT 0x0001 + +#define SSHKEY_CERT_MAX_PRINCIPALS 256 +/* XXX opaquify? */ +struct sshkey_cert { + struct sshbuf *certblob; /* Kept around for use on wire */ + u_int type; /* SSH2_CERT_TYPE_USER or SSH2_CERT_TYPE_HOST */ + u_int64_t serial; + char *key_id; + u_int nprincipals; + char **principals; + u_int64_t valid_after, valid_before; + struct sshbuf *critical; + struct sshbuf *extensions; + struct sshkey *signature_key; + char *signature_type; +}; + +/* XXX opaquify? */ +struct sshkey { + int type; + int flags; + /* KEY_RSA */ + RSA *rsa; + /* KEY_DSA */ + DSA *dsa; + /* KEY_ECDSA and KEY_ECDSA_SK */ + int ecdsa_nid; /* NID of curve */ + EC_KEY *ecdsa; + /* KEY_ED25519 and KEY_ED25519_SK */ + u_char *ed25519_sk; + u_char *ed25519_pk; + /* KEY_XMSS */ + char *xmss_name; + char *xmss_filename; /* for state file updates */ + void *xmss_state; /* depends on xmss_name, opaque */ + u_char *xmss_sk; + u_char *xmss_pk; + /* KEY_ECDSA_SK and KEY_ED25519_SK */ + char *sk_application; + uint8_t sk_flags; + struct sshbuf *sk_key_handle; + struct sshbuf *sk_reserved; + /* Certificates */ + struct sshkey_cert *cert; + /* Private key shielding */ + u_char *shielded_private; + size_t shielded_len; + u_char *shield_prekey; + size_t shield_prekey_len; +}; + +#define ED25519_SK_SZ crypto_sign_ed25519_SECRETKEYBYTES +#define ED25519_PK_SZ crypto_sign_ed25519_PUBLICKEYBYTES + +/* Additional fields contained in signature */ +struct sshkey_sig_details { + uint32_t sk_counter; /* U2F signature counter */ + uint8_t sk_flags; /* U2F signature flags; see ssh-sk.h */ +}; + +struct sshkey_impl_funcs { + u_int (*size)(const struct sshkey *); /* optional */ + int (*alloc)(struct sshkey *); /* optional */ + void (*cleanup)(struct sshkey *); /* optional */ + int (*equal)(const struct sshkey *, const struct sshkey *); + int (*serialize_public)(const struct sshkey *, struct sshbuf *, + enum sshkey_serialize_rep); + int (*deserialize_public)(const char *, struct sshbuf *, + struct sshkey *); + int (*serialize_private)(const struct sshkey *, struct sshbuf *, + enum sshkey_serialize_rep); + int (*deserialize_private)(const char *, struct sshbuf *, + struct sshkey *); + int (*generate)(struct sshkey *, int); /* optional */ + int (*copy_public)(const struct sshkey *, struct sshkey *); + int (*sign)(struct sshkey *, u_char **, size_t *, + const u_char *, size_t, const char *, + const char *, const char *, u_int); /* optional */ + int (*verify)(const struct sshkey *, const u_char *, size_t, + const u_char *, size_t, const char *, u_int, + struct sshkey_sig_details **); +}; + +struct sshkey_impl { + const char *name; + const char *shortname; + const char *sigalg; + int type; + int nid; + int cert; + int sigonly; + int keybits; + const struct sshkey_impl_funcs *funcs; +}; + +struct sshkey *sshkey_new(int); +void sshkey_free(struct sshkey *); +int sshkey_equal_public(const struct sshkey *, + const struct sshkey *); +int sshkey_equal(const struct sshkey *, const struct sshkey *); +char *sshkey_fingerprint(const struct sshkey *, + int, enum sshkey_fp_rep); +int sshkey_fingerprint_raw(const struct sshkey *k, + int, u_char **retp, size_t *lenp); +const char *sshkey_type(const struct sshkey *); +const char *sshkey_cert_type(const struct sshkey *); +int sshkey_format_text(const struct sshkey *, struct sshbuf *); +int sshkey_write(const struct sshkey *, FILE *); +int sshkey_read(struct sshkey *, char **); +u_int sshkey_size(const struct sshkey *); + +int sshkey_generate(int type, u_int bits, struct sshkey **keyp); +int sshkey_from_private(const struct sshkey *, struct sshkey **); + +int sshkey_is_shielded(struct sshkey *); +int sshkey_shield_private(struct sshkey *); +int sshkey_unshield_private(struct sshkey *); + +int sshkey_type_from_name(const char *); +int sshkey_is_cert(const struct sshkey *); +int sshkey_is_sk(const struct sshkey *); +int sshkey_type_is_cert(int); +int sshkey_type_plain(int); + +/* Returns non-zero if key name match sigalgs pattern list. (handles RSA) */ +int sshkey_match_keyname_to_sigalgs(const char *, const char *); + +int sshkey_to_certified(struct sshkey *); +int sshkey_drop_cert(struct sshkey *); +int sshkey_cert_copy(const struct sshkey *, struct sshkey *); +int sshkey_cert_check_authority(const struct sshkey *, int, int, int, + uint64_t, const char *, const char **); +int sshkey_cert_check_authority_now(const struct sshkey *, int, int, int, + const char *, const char **); +int sshkey_cert_check_host(const struct sshkey *, const char *, + int , const char *, const char **); +size_t sshkey_format_cert_validity(const struct sshkey_cert *, + char *, size_t) __attribute__((__bounded__(__string__, 2, 3))); +int sshkey_check_cert_sigtype(const struct sshkey *, const char *); + +int sshkey_certify(struct sshkey *, struct sshkey *, + const char *, const char *, const char *); +/* Variant allowing use of a custom signature function (e.g. for ssh-agent) */ +typedef int sshkey_certify_signer(struct sshkey *, u_char **, size_t *, + const u_char *, size_t, const char *, const char *, const char *, + u_int, void *); +int sshkey_certify_custom(struct sshkey *, struct sshkey *, const char *, + const char *, const char *, sshkey_certify_signer *, void *); + +int sshkey_ecdsa_nid_from_name(const char *); +int sshkey_curve_name_to_nid(const char *); +const char * sshkey_curve_nid_to_name(int); +u_int sshkey_curve_nid_to_bits(int); +int sshkey_ecdsa_bits_to_nid(int); +int sshkey_ecdsa_key_to_nid(EC_KEY *); +int sshkey_ec_nid_to_hash_alg(int nid); +int sshkey_ec_validate_public(const EC_GROUP *, const EC_POINT *); +int sshkey_ec_validate_private(const EC_KEY *); +const char *sshkey_ssh_name(const struct sshkey *); +const char *sshkey_ssh_name_plain(const struct sshkey *); +int sshkey_names_valid2(const char *, int, int); +char *sshkey_alg_list(int, int, int, char); + +int sshkey_from_blob(const u_char *, size_t, struct sshkey **); +int sshkey_fromb(struct sshbuf *, struct sshkey **); +int sshkey_froms(struct sshbuf *, struct sshkey **); +int sshkey_to_blob(const struct sshkey *, u_char **, size_t *); +int sshkey_to_base64(const struct sshkey *, char **); +int sshkey_putb(const struct sshkey *, struct sshbuf *); +int sshkey_puts(const struct sshkey *, struct sshbuf *); +int sshkey_puts_opts(const struct sshkey *, struct sshbuf *, + enum sshkey_serialize_rep); +int sshkey_plain_to_blob(const struct sshkey *, u_char **, size_t *); +int sshkey_putb_plain(const struct sshkey *, struct sshbuf *); + +int sshkey_sign(struct sshkey *, u_char **, size_t *, + const u_char *, size_t, const char *, const char *, const char *, u_int); +int sshkey_verify(const struct sshkey *, const u_char *, size_t, + const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **); +int sshkey_check_sigtype(const u_char *, size_t, const char *); +const char *sshkey_sigalg_by_name(const char *); +int sshkey_get_sigtype(const u_char *, size_t, char **); + +/* for debug */ +void sshkey_dump_ec_point(const EC_GROUP *, const EC_POINT *); +void sshkey_dump_ec_key(const EC_KEY *); + +/* private key parsing and serialisation */ +int sshkey_private_serialize(struct sshkey *key, struct sshbuf *buf); +int sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf, + enum sshkey_serialize_rep); +int sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **keyp); + +/* private key file format parsing and serialisation */ +int sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, + const char *passphrase, const char *comment, + int format, const char *openssh_format_cipher, int openssh_format_rounds); +int sshkey_parse_private_fileblob(struct sshbuf *buffer, + const char *passphrase, struct sshkey **keyp, char **commentp); +int sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, + const char *passphrase, struct sshkey **keyp, char **commentp); +int sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, + int type, struct sshkey **pubkeyp); + +int sshkey_check_rsa_length(const struct sshkey *, int); +/* XXX should be internal, but used by ssh-keygen */ +int ssh_rsa_complete_crt_parameters(struct sshkey *, const BIGNUM *); + +/* stateful keys (e.g. XMSS) */ +int sshkey_set_filename(struct sshkey *, const char *); +int sshkey_enable_maxsign(struct sshkey *, u_int32_t); +u_int32_t sshkey_signatures_left(const struct sshkey *); +int sshkey_forward_state(const struct sshkey *, u_int32_t, int); +int sshkey_private_serialize_maxsign(struct sshkey *key, + struct sshbuf *buf, u_int32_t maxsign, int); + +void sshkey_sig_details_free(struct sshkey_sig_details *); + +#ifdef SSHKEY_INTERNAL +int sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b); +void sshkey_sk_cleanup(struct sshkey *k); +int sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b); +int sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to); +int sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key); +int sshkey_serialize_private_sk(const struct sshkey *key, + struct sshbuf *buf); +int sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k); +#ifdef WITH_OPENSSL +int check_rsa_length(const RSA *rsa); /* XXX remove */ +#endif +#endif + +#if !defined(WITH_OPENSSL) +# undef RSA +# undef DSA +# undef EC_KEY +# undef EC_GROUP +# undef EC_POINT +#elif !defined(OPENSSL_HAS_ECC) +# undef EC_KEY +# undef EC_GROUP +# undef EC_POINT +#endif + +#endif /* SSHKEY_H */ |