зеркало из https://github.com/github/putty.git
603 строки
20 KiB
C
603 строки
20 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "puttymem.h"
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#include "tree234.h"
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#include "network.h"
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#include "int64.h"
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#include "misc.h"
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struct ssh_channel;
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extern int sshfwd_write(struct ssh_channel *c, char *, int);
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extern void sshfwd_write_eof(struct ssh_channel *c);
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extern void sshfwd_unclean_close(struct ssh_channel *c);
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extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);
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/*
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* Useful thing.
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*/
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#ifndef lenof
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#define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
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#endif
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#define SSH_CIPHER_IDEA 1
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#define SSH_CIPHER_DES 2
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#define SSH_CIPHER_3DES 3
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#define SSH_CIPHER_BLOWFISH 6
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#ifdef MSCRYPTOAPI
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#define APIEXTRA 8
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#else
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#define APIEXTRA 0
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#endif
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#ifndef BIGNUM_INTERNAL
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typedef void *Bignum;
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#endif
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struct RSAKey {
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int bits;
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int bytes;
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#ifdef MSCRYPTOAPI
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unsigned long exponent;
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unsigned char *modulus;
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#else
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Bignum modulus;
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Bignum exponent;
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Bignum private_exponent;
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Bignum p;
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Bignum q;
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Bignum iqmp;
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#endif
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char *comment;
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};
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struct dss_key {
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Bignum p, q, g, y, x;
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};
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int makekey(unsigned char *data, int len, struct RSAKey *result,
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unsigned char **keystr, int order);
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int makeprivate(unsigned char *data, int len, struct RSAKey *result);
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int rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
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Bignum rsadecrypt(Bignum input, struct RSAKey *key);
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void rsasign(unsigned char *data, int length, struct RSAKey *key);
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void rsasanitise(struct RSAKey *key);
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int rsastr_len(struct RSAKey *key);
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void rsastr_fmt(char *str, struct RSAKey *key);
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void rsa_fingerprint(char *str, int len, struct RSAKey *key);
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int rsa_verify(struct RSAKey *key);
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unsigned char *rsa_public_blob(struct RSAKey *key, int *len);
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int rsa_public_blob_len(void *data, int maxlen);
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void freersakey(struct RSAKey *key);
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#ifndef PUTTY_UINT32_DEFINED
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/* This makes assumptions about the int type. */
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typedef unsigned int uint32;
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#define PUTTY_UINT32_DEFINED
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#endif
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typedef uint32 word32;
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unsigned long crc32_compute(const void *s, size_t len);
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unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);
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/* SSH CRC compensation attack detector */
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void *crcda_make_context(void);
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void crcda_free_context(void *handle);
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int detect_attack(void *handle, unsigned char *buf, uint32 len,
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unsigned char *IV);
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/*
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* SSH2 RSA key exchange functions
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*/
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struct ssh_hash;
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void *ssh_rsakex_newkey(char *data, int len);
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void ssh_rsakex_freekey(void *key);
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int ssh_rsakex_klen(void *key);
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void ssh_rsakex_encrypt(const struct ssh_hash *h, unsigned char *in, int inlen,
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unsigned char *out, int outlen,
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void *key);
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typedef struct {
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uint32 h[4];
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} MD5_Core_State;
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struct MD5Context {
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#ifdef MSCRYPTOAPI
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unsigned long hHash;
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#else
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MD5_Core_State core;
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unsigned char block[64];
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int blkused;
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uint32 lenhi, lenlo;
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#endif
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};
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void MD5Init(struct MD5Context *context);
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void MD5Update(struct MD5Context *context, unsigned char const *buf,
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unsigned len);
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void MD5Final(unsigned char digest[16], struct MD5Context *context);
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void MD5Simple(void const *p, unsigned len, unsigned char output[16]);
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void *hmacmd5_make_context(void);
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void hmacmd5_free_context(void *handle);
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void hmacmd5_key(void *handle, void const *key, int len);
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void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len,
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unsigned char *hmac);
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typedef struct {
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uint32 h[5];
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unsigned char block[64];
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int blkused;
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uint32 lenhi, lenlo;
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} SHA_State;
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void SHA_Init(SHA_State * s);
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void SHA_Bytes(SHA_State * s, const void *p, int len);
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void SHA_Final(SHA_State * s, unsigned char *output);
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void SHA_Simple(const void *p, int len, unsigned char *output);
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void hmac_sha1_simple(void *key, int keylen, void *data, int datalen,
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unsigned char *output);
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typedef struct {
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uint32 h[8];
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unsigned char block[64];
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int blkused;
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uint32 lenhi, lenlo;
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} SHA256_State;
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void SHA256_Init(SHA256_State * s);
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void SHA256_Bytes(SHA256_State * s, const void *p, int len);
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void SHA256_Final(SHA256_State * s, unsigned char *output);
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void SHA256_Simple(const void *p, int len, unsigned char *output);
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typedef struct {
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uint64 h[8];
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unsigned char block[128];
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int blkused;
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uint32 len[4];
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} SHA512_State;
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void SHA512_Init(SHA512_State * s);
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void SHA512_Bytes(SHA512_State * s, const void *p, int len);
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void SHA512_Final(SHA512_State * s, unsigned char *output);
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void SHA512_Simple(const void *p, int len, unsigned char *output);
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struct ssh_cipher {
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void *(*make_context)(void);
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void (*free_context)(void *);
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void (*sesskey) (void *, unsigned char *key); /* for SSH-1 */
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void (*encrypt) (void *, unsigned char *blk, int len);
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void (*decrypt) (void *, unsigned char *blk, int len);
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int blksize;
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char *text_name;
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};
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struct ssh2_cipher {
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void *(*make_context)(void);
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void (*free_context)(void *);
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void (*setiv) (void *, unsigned char *key); /* for SSH-2 */
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void (*setkey) (void *, unsigned char *key);/* for SSH-2 */
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void (*encrypt) (void *, unsigned char *blk, int len);
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void (*decrypt) (void *, unsigned char *blk, int len);
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char *name;
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int blksize;
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int keylen;
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unsigned int flags;
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#define SSH_CIPHER_IS_CBC 1
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char *text_name;
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};
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struct ssh2_ciphers {
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int nciphers;
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const struct ssh2_cipher *const *list;
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};
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struct ssh_mac {
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void *(*make_context)(void);
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void (*free_context)(void *);
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void (*setkey) (void *, unsigned char *key);
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/* whole-packet operations */
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void (*generate) (void *, unsigned char *blk, int len, unsigned long seq);
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int (*verify) (void *, unsigned char *blk, int len, unsigned long seq);
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/* partial-packet operations */
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void (*start) (void *);
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void (*bytes) (void *, unsigned char const *, int);
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void (*genresult) (void *, unsigned char *);
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int (*verresult) (void *, unsigned char const *);
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char *name;
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int len;
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char *text_name;
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};
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struct ssh_hash {
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void *(*init)(void); /* also allocates context */
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void (*bytes)(void *, void *, int);
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void (*final)(void *, unsigned char *); /* also frees context */
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int hlen; /* output length in bytes */
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char *text_name;
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};
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struct ssh_kex {
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char *name, *groupname;
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enum { KEXTYPE_DH, KEXTYPE_RSA } main_type;
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/* For DH */
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const unsigned char *pdata, *gdata; /* NULL means group exchange */
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int plen, glen;
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const struct ssh_hash *hash;
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};
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struct ssh_kexes {
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int nkexes;
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const struct ssh_kex *const *list;
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};
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struct ssh_signkey {
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void *(*newkey) (char *data, int len);
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void (*freekey) (void *key);
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char *(*fmtkey) (void *key);
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unsigned char *(*public_blob) (void *key, int *len);
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unsigned char *(*private_blob) (void *key, int *len);
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void *(*createkey) (unsigned char *pub_blob, int pub_len,
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unsigned char *priv_blob, int priv_len);
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void *(*openssh_createkey) (unsigned char **blob, int *len);
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int (*openssh_fmtkey) (void *key, unsigned char *blob, int len);
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int (*pubkey_bits) (void *blob, int len);
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char *(*fingerprint) (void *key);
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int (*verifysig) (void *key, char *sig, int siglen,
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char *data, int datalen);
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unsigned char *(*sign) (void *key, char *data, int datalen,
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int *siglen);
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char *name;
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char *keytype; /* for host key cache */
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};
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struct ssh_compress {
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char *name;
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/* For zlib@openssh.com: if non-NULL, this name will be considered once
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* userauth has completed successfully. */
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char *delayed_name;
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void *(*compress_init) (void);
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void (*compress_cleanup) (void *);
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int (*compress) (void *, unsigned char *block, int len,
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unsigned char **outblock, int *outlen);
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void *(*decompress_init) (void);
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void (*decompress_cleanup) (void *);
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int (*decompress) (void *, unsigned char *block, int len,
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unsigned char **outblock, int *outlen);
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int (*disable_compression) (void *);
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char *text_name;
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};
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struct ssh2_userkey {
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const struct ssh_signkey *alg; /* the key algorithm */
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void *data; /* the key data */
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char *comment; /* the key comment */
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};
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/* The maximum length of any hash algorithm used in kex. (bytes) */
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#define SSH2_KEX_MAX_HASH_LEN (32) /* SHA-256 */
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extern const struct ssh_cipher ssh_3des;
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extern const struct ssh_cipher ssh_des;
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extern const struct ssh_cipher ssh_blowfish_ssh1;
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extern const struct ssh2_ciphers ssh2_3des;
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extern const struct ssh2_ciphers ssh2_des;
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extern const struct ssh2_ciphers ssh2_aes;
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extern const struct ssh2_ciphers ssh2_blowfish;
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extern const struct ssh2_ciphers ssh2_arcfour;
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extern const struct ssh_hash ssh_sha1;
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extern const struct ssh_hash ssh_sha256;
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extern const struct ssh_kexes ssh_diffiehellman_group1;
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extern const struct ssh_kexes ssh_diffiehellman_group14;
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extern const struct ssh_kexes ssh_diffiehellman_gex;
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extern const struct ssh_kexes ssh_rsa_kex;
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extern const struct ssh_signkey ssh_dss;
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extern const struct ssh_signkey ssh_rsa;
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extern const struct ssh_mac ssh_hmac_md5;
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extern const struct ssh_mac ssh_hmac_sha1;
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extern const struct ssh_mac ssh_hmac_sha1_buggy;
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extern const struct ssh_mac ssh_hmac_sha1_96;
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extern const struct ssh_mac ssh_hmac_sha1_96_buggy;
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extern const struct ssh_mac ssh_hmac_sha256;
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void *aes_make_context(void);
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void aes_free_context(void *handle);
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void aes128_key(void *handle, unsigned char *key);
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void aes192_key(void *handle, unsigned char *key);
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void aes256_key(void *handle, unsigned char *key);
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void aes_iv(void *handle, unsigned char *iv);
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void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len);
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void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len);
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/*
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* PuTTY version number formatted as an SSH version string.
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*/
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extern char sshver[];
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/*
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* Gross hack: pscp will try to start SFTP but fall back to scp1 if
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* that fails. This variable is the means by which scp.c can reach
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* into the SSH code and find out which one it got.
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*/
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extern int ssh_fallback_cmd(void *handle);
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#ifndef MSCRYPTOAPI
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void SHATransform(word32 * digest, word32 * data);
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#endif
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int random_byte(void);
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void random_add_noise(void *noise, int length);
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void random_add_heavynoise(void *noise, int length);
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void logevent(void *, const char *);
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/* Allocate and register a new channel for port forwarding */
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void *new_sock_channel(void *handle, Socket s);
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void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
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/* Exports from portfwd.c */
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extern const char *pfd_newconnect(Socket * s, char *hostname, int port,
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void *c, Conf *conf, int addressfamily);
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/* desthost == NULL indicates dynamic (SOCKS) port forwarding */
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extern const char *pfd_addforward(char *desthost, int destport, char *srcaddr,
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int port, void *backhandle, Conf *conf,
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void **sockdata, int address_family);
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extern void pfd_close(Socket s);
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extern void pfd_terminate(void *sockdata);
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extern int pfd_send(Socket s, char *data, int len);
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extern void pfd_send_eof(Socket s);
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extern void pfd_confirm(Socket s);
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extern void pfd_unthrottle(Socket s);
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extern void pfd_override_throttle(Socket s, int enable);
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/* Exports from x11fwd.c */
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enum {
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X11_TRANS_IPV4 = 0, X11_TRANS_IPV6 = 6, X11_TRANS_UNIX = 256
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};
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struct X11Display {
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/* Broken-down components of the display name itself */
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int unixdomain;
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char *hostname;
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int displaynum;
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int screennum;
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/* OSX sometimes replaces all the above with a full Unix-socket pathname */
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char *unixsocketpath;
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/* PuTTY networking SockAddr to connect to the display, and associated
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* gubbins */
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SockAddr addr;
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int port;
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char *realhost;
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/* Auth details we invented for the virtual display on the SSH server. */
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int remoteauthproto;
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unsigned char *remoteauthdata;
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int remoteauthdatalen;
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char *remoteauthprotoname;
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char *remoteauthdatastring;
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/* Our local auth details for talking to the real X display. */
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int localauthproto;
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unsigned char *localauthdata;
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int localauthdatalen;
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/*
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* Used inside x11fwd.c to remember recently seen
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* XDM-AUTHORIZATION-1 strings, to avoid replay attacks.
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*/
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tree234 *xdmseen;
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};
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/*
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* x11_setup_display() parses the display variable and fills in an
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* X11Display structure. Some remote auth details are invented;
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* the supplied authtype parameter configures the preferred
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* authorisation protocol to use at the remote end. The local auth
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* details are looked up by calling platform_get_x11_auth.
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*/
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extern struct X11Display *x11_setup_display(char *display, int authtype,
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Conf *);
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void x11_free_display(struct X11Display *disp);
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extern const char *x11_init(Socket *, struct X11Display *, void *,
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const char *, int, Conf *);
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extern void x11_close(Socket);
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extern int x11_send(Socket, char *, int);
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extern void x11_send_eof(Socket s);
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extern void x11_unthrottle(Socket s);
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extern void x11_override_throttle(Socket s, int enable);
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char *x11_display(const char *display);
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/* Platform-dependent X11 functions */
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extern void platform_get_x11_auth(struct X11Display *display, Conf *);
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/* examine a mostly-filled-in X11Display and fill in localauth* */
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extern const int platform_uses_x11_unix_by_default;
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/* choose default X transport in the absence of a specified one */
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SockAddr platform_get_x11_unix_address(const char *path, int displaynum);
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/* make up a SockAddr naming the address for displaynum */
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char *platform_get_x_display(void);
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/* allocated local X display string, if any */
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/* Callbacks in x11.c usable _by_ platform X11 functions */
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/*
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* This function does the job of platform_get_x11_auth, provided
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* it is told where to find a normally formatted .Xauthority file:
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* it opens that file, parses it to find an auth record which
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* matches the display details in "display", and fills in the
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* localauth fields.
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*
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* It is expected that most implementations of
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* platform_get_x11_auth() will work by finding their system's
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* .Xauthority file, adjusting the display details if necessary
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* for local oddities like Unix-domain socket transport, and
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* calling this function to do the rest of the work.
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*/
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void x11_get_auth_from_authfile(struct X11Display *display,
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const char *authfilename);
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Bignum copybn(Bignum b);
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Bignum bn_power_2(int n);
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void bn_restore_invariant(Bignum b);
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Bignum bignum_from_long(unsigned long n);
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void freebn(Bignum b);
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Bignum modpow(Bignum base, Bignum exp, Bignum mod);
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Bignum modmul(Bignum a, Bignum b, Bignum mod);
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void decbn(Bignum n);
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extern Bignum Zero, One;
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Bignum bignum_from_bytes(const unsigned char *data, int nbytes);
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int ssh1_read_bignum(const unsigned char *data, int len, Bignum * result);
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int bignum_bitcount(Bignum bn);
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int ssh1_bignum_length(Bignum bn);
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int ssh2_bignum_length(Bignum bn);
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int bignum_byte(Bignum bn, int i);
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int bignum_bit(Bignum bn, int i);
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void bignum_set_bit(Bignum bn, int i, int value);
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int ssh1_write_bignum(void *data, Bignum bn);
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Bignum biggcd(Bignum a, Bignum b);
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unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
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Bignum bignum_add_long(Bignum number, unsigned long addend);
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Bignum bigadd(Bignum a, Bignum b);
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Bignum bigsub(Bignum a, Bignum b);
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Bignum bigmul(Bignum a, Bignum b);
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Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
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Bignum bigdiv(Bignum a, Bignum b);
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Bignum bigmod(Bignum a, Bignum b);
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Bignum modinv(Bignum number, Bignum modulus);
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Bignum bignum_bitmask(Bignum number);
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Bignum bignum_rshift(Bignum number, int shift);
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int bignum_cmp(Bignum a, Bignum b);
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char *bignum_decimal(Bignum x);
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#ifdef DEBUG
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void diagbn(char *prefix, Bignum md);
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#endif
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void *dh_setup_group(const struct ssh_kex *kex);
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void *dh_setup_gex(Bignum pval, Bignum gval);
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void dh_cleanup(void *);
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Bignum dh_create_e(void *, int nbits);
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Bignum dh_find_K(void *, Bignum f);
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int loadrsakey(const Filename *filename, struct RSAKey *key,
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char *passphrase, const char **errorstr);
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int rsakey_encrypted(const Filename *filename, char **comment);
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int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen,
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char **commentptr, const char **errorstr);
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int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase);
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extern int base64_decode_atom(char *atom, unsigned char *out);
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extern int base64_lines(int datalen);
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extern void base64_encode_atom(unsigned char *data, int n, char *out);
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extern void base64_encode(FILE *fp, unsigned char *data, int datalen, int cpl);
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/* ssh2_load_userkey can return this as an error */
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extern struct ssh2_userkey ssh2_wrong_passphrase;
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#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
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int ssh2_userkey_encrypted(const Filename *filename, char **comment);
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struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
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char *passphrase, const char **errorstr);
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unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
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int *pub_blob_len, char **commentptr,
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const char **errorstr);
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int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key,
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char *passphrase);
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const struct ssh_signkey *find_pubkey_alg(const char *name);
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enum {
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SSH_KEYTYPE_UNOPENABLE,
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SSH_KEYTYPE_UNKNOWN,
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SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
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SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
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};
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int key_type(const Filename *filename);
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char *key_type_to_str(int type);
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int import_possible(int type);
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int import_target_type(int type);
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int import_encrypted(const Filename *filename, int type, char **comment);
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int import_ssh1(const Filename *filename, int type,
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struct RSAKey *key, char *passphrase, const char **errmsg_p);
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struct ssh2_userkey *import_ssh2(const Filename *filename, int type,
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char *passphrase, const char **errmsg_p);
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int export_ssh1(const Filename *filename, int type,
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struct RSAKey *key, char *passphrase);
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int export_ssh2(const Filename *filename, int type,
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struct ssh2_userkey *key, char *passphrase);
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void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
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void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
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void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
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unsigned char *blk, int len);
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void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
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unsigned char *blk, int len);
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void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
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int len);
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void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
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int len);
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void des_encrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
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void des_decrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
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/*
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* For progress updates in the key generation utility.
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*/
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#define PROGFN_INITIALISE 1
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#define PROGFN_LIN_PHASE 2
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#define PROGFN_EXP_PHASE 3
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|
#define PROGFN_PHASE_EXTENT 4
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#define PROGFN_READY 5
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|
#define PROGFN_PROGRESS 6
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typedef void (*progfn_t) (void *param, int action, int phase, int progress);
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|
|
|
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,
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|
int phase, progfn_t pfn, void *pfnparam, unsigned firstbits);
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|
void invent_firstbits(unsigned *one, unsigned *two);
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|
|
|
|
|
/*
|
|
* zlib compression.
|
|
*/
|
|
void *zlib_compress_init(void);
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|
void zlib_compress_cleanup(void *);
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|
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);
|
|
|
|
/*
|
|
* SSH-1 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 SSH-1 and OpenSSH's SSH-2.
|
|
*/
|
|
#define SSH_AGENT_FAILURE 5
|
|
#define SSH_AGENT_SUCCESS 6
|
|
|
|
/*
|
|
* OpenSSH's SSH-2 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 SSH-2 keyfile
|
|
* format.
|
|
*/
|
|
void old_keyfile_warning(void);
|