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ssh.h
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ssh.h
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#include <stdio.h>
#include <string.h>
#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;
#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, 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 void *s, size_t len);
unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);
/* SSH CRC compensation attack detector */
void *crcda_make_context(void);
void crcda_free_context(void *handle);
int detect_attack(void *handle, unsigned char *buf, uint32 len,
unsigned char *IV);
typedef struct {
uint32 h[4];
} MD5_Core_State;
struct MD5Context {
#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);
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 *(*make_context)(void);
void (*free_context)(void *);
void (*sesskey) (void *, unsigned char *key); /* for ssh 1 */
void (*encrypt) (void *, unsigned char *blk, int len);
void (*decrypt) (void *, unsigned char *blk, int len);
int blksize;
char *text_name;
};
struct ssh2_cipher {
void *(*make_context)(void);
void (*free_context)(void *);
void (*setiv) (void *, unsigned char *key); /* for ssh 2 */
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;
int blksize;
int keylen;
char *text_name;
};
struct ssh2_ciphers {
int nciphers;
const struct ssh2_cipher *const *list;
};
struct ssh_mac {
void *(*make_context)(void);
void (*free_context)(void *);
void (*setkey) (void *, unsigned char *key);
void (*generate) (void *, unsigned char *blk, int len, unsigned long seq);
int (*verify) (void *, 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);
void (*compress_cleanup) (void *);
int (*compress) (void *, unsigned char *block, int len,
unsigned char **outblock, int *outlen);
void *(*decompress_init) (void);
void (*decompress_cleanup) (void *);
int (*decompress) (void *, unsigned char *block, int len,
unsigned char **outblock, int *outlen);
int (*disable_compression) (void *);
char *text_name;
};
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(void *, char *);
/* Allocate and register a new channel for port forwarding */
void *new_sock_channel(void *handle, Socket s);
void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
/* Exports from portfwd.c */
extern char *pfd_newconnect(Socket * s, char *hostname, int port, void *c);
extern char *pfd_addforward(char *desthost, int destport, char *srcaddr,
int port, void *backhandle);
extern void pfd_close(Socket s);
extern int pfd_send(Socket s, char *data, int len);
extern void pfd_confirm(Socket s);
extern void pfd_unthrottle(Socket s);
extern void pfd_override_throttle(Socket s, int enable);
/* Exports from x11fwd.c */
extern char *x11_init(Socket *, char *, void *, void *);
extern void x11_close(Socket);
extern int x11_send(Socket, char *, int);
extern void *x11_invent_auth(char *, int, char *, int);
extern void x11_unthrottle(Socket s);
extern void x11_override_throttle(Socket s, int enable);
extern int x11_get_screen_number(char *display);
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(const unsigned char *data, int nbytes);
int ssh1_read_bignum(const 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(void *, int nbits);
Bignum dh_find_K(void *, 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);
extern int base64_decode_atom(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);
/* 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_compress_cleanup(void *);
void *zlib_decompress_init(void);
void zlib_decompress_cleanup(void *);
int zlib_compress_block(void *, unsigned char *block, int len,
unsigned char **outblock, int *outlen);
int zlib_decompress_block(void *, 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);