X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=ssh.h;h=0b6b4f8ebc9aab85ce0bd45e28214b6bab043173;hb=89da2ddf564a93414ee9ab2df3f053608094e417;hp=a73e93916910cbf4487ffff05ef3469209b3c1b0;hpb=66970c4258fc82b9cb558ccdeb2fbe79c7fe8ef4;p=PuTTY.git diff --git a/ssh.h b/ssh.h index a73e9391..0b6b4f8e 100644 --- a/ssh.h +++ b/ssh.h @@ -99,9 +99,73 @@ struct dss_key { Bignum p, q, g, y, x; }; -int makekey(unsigned char *data, int len, struct RSAKey *result, - unsigned char **keystr, int order); -int makeprivate(unsigned char *data, int len, struct RSAKey *result); +struct ec_curve; + +struct ec_point { + const struct ec_curve *curve; + Bignum x, y; + Bignum z; /* Jacobian denominator */ + unsigned char infinity; +}; + +void ec_point_free(struct ec_point *point); + +/* Weierstrass form curve */ +struct ec_wcurve +{ + Bignum a, b, n; + struct ec_point G; +}; + +/* Montgomery form curve */ +struct ec_mcurve +{ + Bignum a, b; + struct ec_point G; +}; + +/* Edwards form curve */ +struct ec_ecurve +{ + Bignum l, d; + struct ec_point B; +}; + +struct ec_curve { + enum { EC_WEIERSTRASS, EC_MONTGOMERY, EC_EDWARDS } type; + const char *name; + unsigned int fieldBits; + Bignum p; + union { + struct ec_wcurve w; + struct ec_mcurve m; + struct ec_ecurve e; + }; +}; + +const struct ssh_signkey *ec_alg_by_oid(int len, const void *oid, + const struct ec_curve **curve); +const unsigned char *ec_alg_oid(const struct ssh_signkey *alg, int *oidlen); +const int ec_nist_alg_and_curve_by_bits(int bits, + const struct ec_curve **curve, + const struct ssh_signkey **alg); +const int ec_ed_alg_and_curve_by_bits(int bits, + const struct ec_curve **curve, + const struct ssh_signkey **alg); + +struct ssh_signkey; + +struct ec_key { + const struct ssh_signkey *signalg; + struct ec_point publicKey; + Bignum privateKey; +}; + +struct ec_point *ec_public(const Bignum privateKey, const struct ec_curve *curve); + +int makekey(const unsigned char *data, int len, struct RSAKey *result, + const unsigned char **keystr, int order); +int makeprivate(const unsigned char *data, int len, struct RSAKey *result); int rsaencrypt(unsigned char *data, int length, struct RSAKey *key); Bignum rsadecrypt(Bignum input, struct RSAKey *key); void rsasign(unsigned char *data, int length, struct RSAKey *key); @@ -141,6 +205,15 @@ void ssh_rsakex_encrypt(const struct ssh_hash *h, unsigned char *in, int inlen, unsigned char *out, int outlen, void *key); +/* + * SSH2 ECDH key exchange functions + */ +struct ssh_kex; +void *ssh_ecdhkex_newkey(const struct ssh_kex *kex); +void ssh_ecdhkex_freekey(void *key); +char *ssh_ecdhkex_getpublic(void *key, int *len); +Bignum ssh_ecdhkex_getkey(void *key, char *remoteKey, int remoteKeyLen); + /* * Helper function for k generation in DSA, reused in ECDSA */ @@ -221,7 +294,7 @@ struct ssh_cipher { void (*encrypt) (void *, unsigned char *blk, int len); void (*decrypt) (void *, unsigned char *blk, int len); int blksize; - char *text_name; + const char *text_name; }; struct ssh2_cipher { @@ -231,12 +304,12 @@ struct ssh2_cipher { void (*setkey) (void *, unsigned char *key);/* for SSH-2 */ void (*encrypt) (void *, unsigned char *blk, int len); void (*decrypt) (void *, unsigned char *blk, int len); - char *name; + const char *name; int blksize; int keylen; unsigned int flags; #define SSH_CIPHER_IS_CBC 1 - char *text_name; + const char *text_name; }; struct ssh2_ciphers { @@ -256,26 +329,24 @@ struct ssh_mac { void (*bytes) (void *, unsigned char const *, int); void (*genresult) (void *, unsigned char *); int (*verresult) (void *, unsigned char const *); - char *name; + const char *name, *etm_name; int len; - char *text_name; + const char *text_name; }; struct ssh_hash { void *(*init)(void); /* also allocates context */ - void (*bytes)(void *, void *, int); + void (*bytes)(void *, const void *, int); void (*final)(void *, unsigned char *); /* also frees context */ int hlen; /* output length in bytes */ - char *text_name; + const char *text_name; }; struct ssh_kex { - char *name, *groupname; - enum { KEXTYPE_DH, KEXTYPE_RSA } main_type; - /* For DH */ - const unsigned char *pdata, *gdata; /* NULL means group exchange */ - int plen, glen; + const char *name, *groupname; + enum { KEXTYPE_DH, KEXTYPE_RSA, KEXTYPE_ECDH } main_type; const struct ssh_hash *hash; + const void *extra; /* private to the kex methods */ }; struct ssh_kexes { @@ -284,30 +355,43 @@ struct ssh_kexes { }; struct ssh_signkey { - void *(*newkey) (char *data, int len); + void *(*newkey) (const struct ssh_signkey *self, + const char *data, int len); void (*freekey) (void *key); char *(*fmtkey) (void *key); unsigned char *(*public_blob) (void *key, int *len); unsigned char *(*private_blob) (void *key, int *len); - void *(*createkey) (unsigned char *pub_blob, int pub_len, - unsigned char *priv_blob, int priv_len); - void *(*openssh_createkey) (unsigned char **blob, int *len); + void *(*createkey) (const struct ssh_signkey *self, + const unsigned char *pub_blob, int pub_len, + const unsigned char *priv_blob, int priv_len); + void *(*openssh_createkey) (const struct ssh_signkey *self, + const unsigned char **blob, int *len); int (*openssh_fmtkey) (void *key, unsigned char *blob, int len); - int (*pubkey_bits) (void *blob, int len); - char *(*fingerprint) (void *key); - int (*verifysig) (void *key, char *sig, int siglen, - char *data, int datalen); - unsigned char *(*sign) (void *key, char *data, int datalen, + /* OpenSSH private key blobs, as created by openssh_fmtkey and + * consumed by openssh_createkey, always (at least so far...) take + * the form of a number of SSH-2 strings / mpints concatenated + * end-to-end. Because the new-style OpenSSH private key format + * stores those blobs without a containing string wrapper, we need + * to know how many strings each one consists of, so that we can + * skip over the right number to find the next key in the file. + * openssh_private_npieces gives that information. */ + int openssh_private_npieces; + int (*pubkey_bits) (const struct ssh_signkey *self, + const void *blob, int len); + int (*verifysig) (void *key, const char *sig, int siglen, + const char *data, int datalen); + unsigned char *(*sign) (void *key, const char *data, int datalen, int *siglen); - char *name; - char *keytype; /* for host key cache */ + const char *name; + const char *keytype; /* for host key cache */ + const void *extra; /* private to the public key methods */ }; struct ssh_compress { - char *name; + const char *name; /* For zlib@openssh.com: if non-NULL, this name will be considered once * userauth has completed successfully. */ - char *delayed_name; + const char *delayed_name; void *(*compress_init) (void); void (*compress_cleanup) (void *); int (*compress) (void *, unsigned char *block, int len, @@ -317,7 +401,7 @@ struct ssh_compress { int (*decompress) (void *, unsigned char *block, int len, unsigned char **outblock, int *outlen); int (*disable_compression) (void *); - char *text_name; + const char *text_name; }; struct ssh2_userkey { @@ -327,7 +411,7 @@ struct ssh2_userkey { }; /* The maximum length of any hash algorithm used in kex. (bytes) */ -#define SSH2_KEX_MAX_HASH_LEN (32) /* SHA-256 */ +#define SSH2_KEX_MAX_HASH_LEN (64) /* SHA-512 */ extern const struct ssh_cipher ssh_3des; extern const struct ssh_cipher ssh_des; @@ -345,8 +429,13 @@ extern const struct ssh_kexes ssh_diffiehellman_group1; extern const struct ssh_kexes ssh_diffiehellman_group14; extern const struct ssh_kexes ssh_diffiehellman_gex; extern const struct ssh_kexes ssh_rsa_kex; +extern const struct ssh_kexes ssh_ecdh_kex; extern const struct ssh_signkey ssh_dss; extern const struct ssh_signkey ssh_rsa; +extern const struct ssh_signkey ssh_ecdsa_ed25519; +extern const struct ssh_signkey ssh_ecdsa_nistp256; +extern const struct ssh_signkey ssh_ecdsa_nistp384; +extern const struct ssh_signkey ssh_ecdsa_nistp521; extern const struct ssh_mac ssh_hmac_md5; extern const struct ssh_mac ssh_hmac_sha1; extern const struct ssh_mac ssh_hmac_sha1_buggy; @@ -389,7 +478,8 @@ struct PortForwarding; /* Allocate and register a new channel for port forwarding */ void *new_sock_channel(void *handle, struct PortForwarding *pf); -void ssh_send_port_open(void *channel, char *hostname, int port, char *org); +void ssh_send_port_open(void *channel, const char *hostname, int port, + const char *org); /* Exports from portfwd.c */ extern char *pfd_connect(struct PortForwarding **pf, char *hostname, int port, @@ -468,7 +558,7 @@ int x11_authcmp(void *av, void *bv); /* for putting X11FakeAuth in a tree234 */ * authorisation protocol to use at the remote end. The local auth * details are looked up by calling platform_get_x11_auth. */ -extern struct X11Display *x11_setup_display(char *display, Conf *); +extern struct X11Display *x11_setup_display(const char *display, Conf *); void x11_free_display(struct X11Display *disp); struct X11FakeAuth *x11_invent_fake_auth(tree234 *t, int authtype); void x11_free_fake_auth(struct X11FakeAuth *auth); @@ -515,9 +605,12 @@ Bignum bignum_from_long(unsigned long n); void freebn(Bignum b); Bignum modpow(Bignum base, Bignum exp, Bignum mod); Bignum modmul(Bignum a, Bignum b, Bignum mod); +Bignum modsub(const Bignum a, const Bignum b, const Bignum n); void decbn(Bignum n); extern Bignum Zero, One; Bignum bignum_from_bytes(const unsigned char *data, int nbytes); +Bignum bignum_from_bytes_le(const unsigned char *data, int nbytes); +Bignum bignum_random_in_range(const Bignum lower, const Bignum upper); int ssh1_read_bignum(const unsigned char *data, int len, Bignum * result); int bignum_bitcount(Bignum bn); int ssh1_bignum_length(Bignum bn); @@ -538,31 +631,36 @@ Bignum bigmod(Bignum a, Bignum b); Bignum modinv(Bignum number, Bignum modulus); Bignum bignum_bitmask(Bignum number); Bignum bignum_rshift(Bignum number, int shift); +Bignum bignum_lshift(Bignum number, int shift); int bignum_cmp(Bignum a, Bignum b); char *bignum_decimal(Bignum x); +Bignum bignum_from_decimal(const char *decimal); #ifdef DEBUG void diagbn(char *prefix, Bignum md); #endif +int dh_is_gex(const struct ssh_kex *kex); void *dh_setup_group(const struct ssh_kex *kex); void *dh_setup_gex(Bignum pval, Bignum gval); void dh_cleanup(void *); Bignum dh_create_e(void *, int nbits); +const char *dh_validate_f(void *handle, Bignum f); Bignum dh_find_K(void *, Bignum f); int loadrsakey(const Filename *filename, struct RSAKey *key, - char *passphrase, const char **errorstr); + const char *passphrase, const char **errorstr); int rsakey_encrypted(const Filename *filename, char **comment); int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen, char **commentptr, const char **errorstr); int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase); -extern int base64_decode_atom(char *atom, unsigned char *out); +extern int base64_decode_atom(const char *atom, unsigned char *out); extern int base64_lines(int datalen); -extern void base64_encode_atom(unsigned char *data, int n, char *out); -extern void base64_encode(FILE *fp, unsigned char *data, int datalen, int cpl); +extern void base64_encode_atom(const unsigned char *data, int n, char *out); +extern void base64_encode(FILE *fp, const unsigned char *data, int datalen, + int cpl); /* ssh2_load_userkey can return this as an error */ extern struct ssh2_userkey ssh2_wrong_passphrase; @@ -570,22 +668,69 @@ extern struct ssh2_userkey ssh2_wrong_passphrase; int ssh2_userkey_encrypted(const Filename *filename, char **comment); struct ssh2_userkey *ssh2_load_userkey(const Filename *filename, - char *passphrase, const char **errorstr); + const char *passphrase, + const char **errorstr); unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm, int *pub_blob_len, char **commentptr, const char **errorstr); int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key, char *passphrase); const struct ssh_signkey *find_pubkey_alg(const char *name); +const struct ssh_signkey *find_pubkey_alg_len(int namelen, const char *name); enum { SSH_KEYTYPE_UNOPENABLE, SSH_KEYTYPE_UNKNOWN, SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2, - SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM + /* + * The OpenSSH key types deserve a little explanation. OpenSSH has + * two physical formats for private key storage: an old PEM-based + * one largely dictated by their use of OpenSSL and full of ASN.1, + * and a new one using the same private key formats used over the + * wire for talking to ssh-agent. The old format can only support + * a subset of the key types, because it needs redesign for each + * key type, and after a while they decided to move to the new + * format so as not to have to do that. + * + * On input, key files are identified as either + * SSH_KEYTYPE_OPENSSH_PEM or SSH_KEYTYPE_OPENSSH_NEW, describing + * accurately which actual format the keys are stored in. + * + * On output, however, we default to following OpenSSH's own + * policy of writing out PEM-style keys for maximum backwards + * compatibility if the key type supports it, and otherwise + * switching to the new format. So the formats you can select for + * output are SSH_KEYTYPE_OPENSSH_NEW (forcing the new format for + * any key type), and SSH_KEYTYPE_OPENSSH_AUTO to use the oldest + * format supported by whatever key type you're writing out. + * + * So we have three type codes, but only two of them usable in any + * given circumstance. An input key file will never be identified + * as AUTO, only PEM or NEW; key export UIs should not be able to + * select PEM, only AUTO or NEW. + */ + SSH_KEYTYPE_OPENSSH_AUTO, + SSH_KEYTYPE_OPENSSH_PEM, + SSH_KEYTYPE_OPENSSH_NEW, + SSH_KEYTYPE_SSHCOM, + /* + * Public-key-only formats, which we still want to be able to read + * for various purposes. + */ + SSH_KEYTYPE_SSH1_PUBLIC, + SSH_KEYTYPE_SSH2_PUBLIC_RFC4716, + SSH_KEYTYPE_SSH2_PUBLIC_OPENSSH }; +char *ssh1_pubkey_str(struct RSAKey *ssh1key); +void ssh1_write_pubkey(FILE *fp, struct RSAKey *ssh1key); +char *ssh2_pubkey_openssh_str(struct ssh2_userkey *key); +void ssh2_write_pubkey(FILE *fp, const char *comment, + const void *v_pub_blob, int pub_len, + int keytype); +char *ssh2_fingerprint_blob(const void *blob, int bloblen); +char *ssh2_fingerprint(const struct ssh_signkey *alg, void *data); int key_type(const Filename *filename); -char *key_type_to_str(int type); +const char *key_type_to_str(int type); int import_possible(int type); int import_target_type(int type); @@ -615,6 +760,10 @@ void des_encrypt_xdmauth(const unsigned char *key, void des_decrypt_xdmauth(const unsigned char *key, unsigned char *blk, int len); +void openssh_bcrypt(const char *passphrase, + const unsigned char *salt, int saltbytes, + int rounds, unsigned char *out, int outbytes); + /* * For progress updates in the key generation utility. */ @@ -630,6 +779,10 @@ int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn, void *pfnparam); int dsa_generate(struct dss_key *key, int bits, progfn_t pfn, void *pfnparam); +int ec_generate(struct ec_key *key, int bits, progfn_t pfn, + void *pfnparam); +int ec_edgenerate(struct ec_key *key, int bits, progfn_t pfn, + void *pfnparam); Bignum primegen(int bits, int modulus, int residue, Bignum factor, int phase, progfn_t pfn, void *pfnparam, unsigned firstbits); void invent_firstbits(unsigned *one, unsigned *two); @@ -732,13 +885,18 @@ void platform_ssh_share_cleanup(const char *name); #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ -#define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */ +#define SSH2_MSG_KEX_DH_GEX_REQUEST_OLD 30 /* 0x1e */ +#define SSH2_MSG_KEX_DH_GEX_REQUEST 34 /* 0x22 */ #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */ #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */ #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */ #define SSH2_MSG_KEXRSA_PUBKEY 30 /* 0x1e */ #define SSH2_MSG_KEXRSA_SECRET 31 /* 0x1f */ #define SSH2_MSG_KEXRSA_DONE 32 /* 0x20 */ +#define SSH2_MSG_KEX_ECDH_INIT 30 /* 0x1e */ +#define SSH2_MSG_KEX_ECDH_REPLY 31 /* 0x1f */ +#define SSH2_MSG_KEX_ECMQV_INIT 30 /* 0x1e */ +#define SSH2_MSG_KEX_ECMQV_REPLY 31 /* 0x1f */ #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */