X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/37508af4ab231b1fde58345f5237f3ee82803829..514702987c9252fcb0ab98882a6603b3bd0505ce:/ssh.h diff --git a/ssh.h b/ssh.h index 5c72eeb1..59a7b460 100644 --- a/ssh.h +++ b/ssh.h @@ -1,41 +1,393 @@ #include +#include "puttymem.h" +#include "network.h" +#include "int64.h" + +struct ssh_channel; + +extern void sshfwd_close(struct ssh_channel *c); +extern int sshfwd_write(struct ssh_channel *c, char *, int); +extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize); + +/* + * Useful thing. + */ +#ifndef lenof +#define lenof(x) ( (sizeof((x))) / (sizeof(*(x)))) +#endif + +#define SSH_CIPHER_IDEA 1 +#define SSH_CIPHER_DES 2 +#define SSH_CIPHER_3DES 3 +#define SSH_CIPHER_BLOWFISH 6 + +#ifdef MSCRYPTOAPI +#define APIEXTRA 8 +#else +#define APIEXTRA 0 +#endif + +#ifndef BIGNUM_INTERNAL +typedef void *Bignum; +#endif + struct RSAKey { int bits; int bytes; - void *modulus; - void *exponent; +#ifdef MSCRYPTOAPI + unsigned long exponent; + unsigned char *modulus; +#else + Bignum modulus; + Bignum exponent; + Bignum private_exponent; + Bignum p; + Bignum q; + Bignum iqmp; +#endif + char *comment; +}; + +struct dss_key { + Bignum p, q, g, y, x; }; int makekey(unsigned char *data, struct RSAKey *result, - unsigned char **keystr); + unsigned char **keystr, int order); +int makeprivate(unsigned char *data, struct RSAKey *result); void 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); +void rsasanitise(struct RSAKey *key); int rsastr_len(struct RSAKey *key); void rsastr_fmt(char *str, struct RSAKey *key); +void rsa_fingerprint(char *str, int len, struct RSAKey *key); +int rsa_verify(struct RSAKey *key); +unsigned char *rsa_public_blob(struct RSAKey *key, int *len); +int rsa_public_blob_len(void *data); +void freersakey(struct RSAKey *key); typedef unsigned int word32; typedef unsigned int uint32; -unsigned long crc32(const unsigned char *s, unsigned int len); +unsigned long crc32(const void *s, size_t len); +unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len); + +/* SSH CRC compensation attack detector */ +int detect_attack(unsigned char *buf, uint32 len, unsigned char *IV); + +typedef struct { + uint32 h[4]; +} MD5_Core_State; struct MD5Context { - uint32 buf[4]; - uint32 bits[2]; - unsigned char in[64]; +#ifdef MSCRYPTOAPI + unsigned long hHash; +#else + MD5_Core_State core; + unsigned char block[64]; + int blkused; + uint32 lenhi, lenlo; +#endif }; void MD5Init(struct MD5Context *context); void MD5Update(struct MD5Context *context, unsigned char const *buf, - unsigned len); + unsigned len); void MD5Final(unsigned char digest[16], struct MD5Context *context); +typedef struct { + uint32 h[5]; + unsigned char block[64]; + int blkused; + uint32 lenhi, lenlo; +} SHA_State; +void SHA_Init(SHA_State * s); +void SHA_Bytes(SHA_State * s, void *p, int len); +void SHA_Final(SHA_State * s, unsigned char *output); +void SHA_Simple(void *p, int len, unsigned char *output); + +void hmac_sha1_simple(void *key, int keylen, void *data, int datalen, + unsigned char *output); + +typedef struct { + uint64 h[8]; + unsigned char block[128]; + int blkused; + uint32 len[4]; +} SHA512_State; +void SHA512_Init(SHA512_State * s); +void SHA512_Bytes(SHA512_State * s, const void *p, int len); +void SHA512_Final(SHA512_State * s, unsigned char *output); +void SHA512_Simple(const void *p, int len, unsigned char *output); + struct ssh_cipher { - void (*sesskey)(unsigned char *key); - void (*encrypt)(unsigned char *blk, int len); - void (*decrypt)(unsigned char *blk, int len); + void (*sesskey) (unsigned char *key); /* for ssh 1 */ + void (*encrypt) (unsigned char *blk, int len); + void (*decrypt) (unsigned char *blk, int len); + int blksize; +}; + +struct ssh2_cipher { + void (*setcsiv) (unsigned char *key); /* for ssh 2 */ + void (*setcskey) (unsigned char *key); /* for ssh 2 */ + void (*setsciv) (unsigned char *key); /* for ssh 2 */ + void (*setsckey) (unsigned char *key); /* for ssh 2 */ + void (*encrypt) (unsigned char *blk, int len); + void (*decrypt) (unsigned char *blk, int len); + char *name; + int blksize; + int keylen; +}; + +struct ssh2_ciphers { + int nciphers; + const struct ssh2_cipher *const *list; +}; + +struct ssh_mac { + void (*setcskey) (unsigned char *key); + void (*setsckey) (unsigned char *key); + void (*generate) (unsigned char *blk, int len, unsigned long seq); + int (*verify) (unsigned char *blk, int len, unsigned long seq); + char *name; + int len; +}; + +struct ssh_kex { + /* + * Plugging in another KEX algorithm requires structural chaos, + * so it's hard to abstract them into nice little structures + * like this. Hence, for the moment, this is just a + * placeholder. I claim justification in the fact that OpenSSH + * does this too :-) + */ + char *name; +}; + +struct ssh_signkey { + void *(*newkey) (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); + int (*openssh_fmtkey) (void *key, unsigned char *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, + int *siglen); + char *name; + char *keytype; /* for host key cache */ +}; + +struct ssh_compress { + char *name; + void (*compress_init) (void); + int (*compress) (unsigned char *block, int len, + unsigned char **outblock, int *outlen); + void (*decompress_init) (void); + int (*decompress) (unsigned char *block, int len, + unsigned char **outblock, int *outlen); + int (*disable_compression) (void); }; -void SHATransform(word32 *digest, word32 *data); +struct ssh2_userkey { + const struct ssh_signkey *alg; /* the key algorithm */ + void *data; /* the key data */ + char *comment; /* the key comment */ +}; + +extern const struct ssh_cipher ssh_3des; +extern const struct ssh_cipher ssh_des; +extern const struct ssh_cipher ssh_blowfish_ssh1; +extern const struct ssh2_ciphers ssh2_3des; +extern const struct ssh2_ciphers ssh2_des; +extern const struct ssh2_ciphers ssh2_aes; +extern const struct ssh2_ciphers ssh2_blowfish; +extern const struct ssh_kex ssh_diffiehellman; +extern const struct ssh_kex ssh_diffiehellman_gex; +extern const struct ssh_signkey ssh_dss; +extern const struct ssh_signkey ssh_rsa; +extern const struct ssh_mac ssh_md5; +extern const struct ssh_mac ssh_sha1; +extern const struct ssh_mac ssh_sha1_buggy; + +/* + * PuTTY version number formatted as an SSH version string. + */ +extern char sshver[]; + +/* + * Gross hack: pscp will try to start SFTP but fall back to scp1 if + * that fails. This variable is the means by which scp.c can reach + * into the SSH code and find out which one it got. + */ +extern int ssh_fallback_cmd(void *handle); + +#ifndef MSCRYPTOAPI +void SHATransform(word32 * digest, word32 * data); +#endif int random_byte(void); void random_add_noise(void *noise, int length); +void random_add_heavynoise(void *noise, int length); + +void logevent(char *); + +/* Allocate and register a new channel for port forwarding */ +void *new_sock_channel(void *handle, Socket s); +void ssh_send_port_open(void *handle, void *channel, + char *hostname, int port, char *org); + +Bignum copybn(Bignum b); +Bignum bn_power_2(int n); +void bn_restore_invariant(Bignum b); +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); +void decbn(Bignum n); +extern Bignum Zero, One; +Bignum bignum_from_bytes(unsigned char *data, int nbytes); +int ssh1_read_bignum(unsigned char *data, Bignum * result); +int bignum_bitcount(Bignum bn); +int ssh1_bignum_length(Bignum bn); +int ssh2_bignum_length(Bignum bn); +int bignum_byte(Bignum bn, int i); +int bignum_bit(Bignum bn, int i); +void bignum_set_bit(Bignum bn, int i, int value); +int ssh1_write_bignum(void *data, Bignum bn); +Bignum biggcd(Bignum a, Bignum b); +unsigned short bignum_mod_short(Bignum number, unsigned short modulus); +Bignum bignum_add_long(Bignum number, unsigned long addend); +Bignum bigmul(Bignum a, Bignum b); +Bignum bigmuladd(Bignum a, Bignum b, Bignum addend); +Bignum bigdiv(Bignum a, Bignum b); +Bignum bigmod(Bignum a, Bignum b); +Bignum modinv(Bignum number, Bignum modulus); +Bignum bignum_bitmask(Bignum number); +Bignum bignum_rshift(Bignum number, int shift); +int bignum_cmp(Bignum a, Bignum b); +char *bignum_decimal(Bignum x); + +void dh_setup_group1(void); +void dh_setup_group(Bignum pval, Bignum gval); +void dh_cleanup(void); +Bignum dh_create_e(int nbits); +Bignum dh_find_K(Bignum f); + +int loadrsakey(char *filename, struct RSAKey *key, char *passphrase); +int rsakey_encrypted(char *filename, char **comment); +int rsakey_pubblob(char *filename, void **blob, int *bloblen); + +int saversakey(char *filename, struct RSAKey *key, char *passphrase); + +void base64_encode_atom(unsigned char *data, int n, char *out); + +/* ssh2_load_userkey can return this as an error */ +extern struct ssh2_userkey ssh2_wrong_passphrase; +#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase) + +int ssh2_userkey_encrypted(char *filename, char **comment); +struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase); +char *ssh2_userkey_loadpub(char *filename, char **algorithm, + int *pub_blob_len); +int ssh2_save_userkey(char *filename, struct ssh2_userkey *key, + char *passphrase); + +enum { + SSH_KEYTYPE_UNOPENABLE, + SSH_KEYTYPE_UNKNOWN, + SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2, + SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM +}; +int key_type(char *filename); +char *key_type_to_str(int type); + +int import_possible(int type); +int import_target_type(int type); +int import_encrypted(char *filename, int type, char **comment); +int import_ssh1(char *filename, int type, struct RSAKey *key,char *passphrase); +struct ssh2_userkey *import_ssh2(char *filename, int type, char *passphrase); +int export_ssh1(char *filename, int type, struct RSAKey *key,char *passphrase); +int export_ssh2(char *filename, int type, + struct ssh2_userkey *key, char *passphrase); + +void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len); +void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len); +void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, + unsigned char *blk, int len); +void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, + unsigned char *blk, int len); +void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk, + int len); +void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk, + int len); + +/* + * For progress updates in the key generation utility. + */ +#define PROGFN_INITIALISE 1 +#define PROGFN_LIN_PHASE 2 +#define PROGFN_EXP_PHASE 3 +#define PROGFN_PHASE_EXTENT 4 +#define PROGFN_READY 5 +#define PROGFN_PROGRESS 6 +typedef void (*progfn_t) (void *param, int action, int phase, int progress); + +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); +Bignum primegen(int bits, int modulus, int residue, Bignum factor, + int phase, progfn_t pfn, void *pfnparam); + + +/* + * zlib compression. + */ +void zlib_compress_init(void); +void zlib_decompress_init(void); +int zlib_compress_block(unsigned char *block, int len, + unsigned char **outblock, int *outlen); +int zlib_decompress_block(unsigned char *block, int len, + unsigned char **outblock, int *outlen); + +/* + * SSH1 agent messages. + */ +#define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1 +#define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2 +#define SSH1_AGENTC_RSA_CHALLENGE 3 +#define SSH1_AGENT_RSA_RESPONSE 4 +#define SSH1_AGENTC_ADD_RSA_IDENTITY 7 +#define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8 +#define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */ + +/* + * Messages common to SSH1 and OpenSSH's SSH2. + */ +#define SSH_AGENT_FAILURE 5 +#define SSH_AGENT_SUCCESS 6 + +/* + * OpenSSH's SSH2 agent messages. + */ +#define SSH2_AGENTC_REQUEST_IDENTITIES 11 +#define SSH2_AGENT_IDENTITIES_ANSWER 12 +#define SSH2_AGENTC_SIGN_REQUEST 13 +#define SSH2_AGENT_SIGN_RESPONSE 14 +#define SSH2_AGENTC_ADD_IDENTITY 17 +#define SSH2_AGENTC_REMOVE_IDENTITY 18 +#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19 + +/* + * Need this to warn about support for the original SSH2 keyfile + * format. + */ +void old_keyfile_warning(void);