git.distorted.org.uk Git - u/mdw/putty/blob - ssh.h

   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 #include "puttymem.h"
   5 #include "network.h"
   6 #include "int64.h"
   7 #include "misc.h"
   8
   9 struct ssh_channel;
  10
  11 extern void sshfwd_close(struct ssh_channel *c);
  12 extern int sshfwd_write(struct ssh_channel *c, char *, int);
  13 extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);
  14
  15 /*
  16  * Useful thing.
  17  */
  18 #ifndef lenof
  19 #define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
  20 #endif
  21
  22 #define SSH_CIPHER_IDEA         1
  23 #define SSH_CIPHER_DES          2
  24 #define SSH_CIPHER_3DES         3
  25 #define SSH_CIPHER_BLOWFISH     6
  26
  27 #ifdef MSCRYPTOAPI
  28 #define APIEXTRA 8
  29 #else
  30 #define APIEXTRA 0
  31 #endif
  32
  33 #ifndef BIGNUM_INTERNAL
  34 typedef void *Bignum;
  35 #endif
  36
  37 struct RSAKey {
  38     int bits;
  39     int bytes;
  40 #ifdef MSCRYPTOAPI
  41     unsigned long exponent;
  42     unsigned char *modulus;
  43 #else
  44     Bignum modulus;
  45     Bignum exponent;
  46     Bignum private_exponent;
  47     Bignum p;
  48     Bignum q;
  49     Bignum iqmp;
  50 #endif
  51     char *comment;
  52 };
  53
  54 struct dss_key {
  55     Bignum p, q, g, y, x;
  56 };
  57
  58 int makekey(unsigned char *data, struct RSAKey *result,
  59             unsigned char **keystr, int order);
  60 int makeprivate(unsigned char *data, struct RSAKey *result);
  61 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  62 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  63 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  64 void rsasanitise(struct RSAKey *key);
  65 int rsastr_len(struct RSAKey *key);
  66 void rsastr_fmt(char *str, struct RSAKey *key);
  67 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  68 int rsa_verify(struct RSAKey *key);
  69 unsigned char *rsa_public_blob(struct RSAKey *key, int *len);
  70 int rsa_public_blob_len(void *data);
  71 void freersakey(struct RSAKey *key);
  72
  73 typedef unsigned int word32;
  74 typedef unsigned int uint32;
  75
  76 unsigned long crc32_compute(const void *s, size_t len);
  77 unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);
  78
  79 /* SSH CRC compensation attack detector */
  80 void *crcda_make_context(void);
  81 void crcda_free_context(void *handle);
  82 int detect_attack(void *handle, unsigned char *buf, uint32 len,
  83                   unsigned char *IV);
  84
  85 typedef struct {
  86     uint32 h[4];
  87 } MD5_Core_State;
  88
  89 struct MD5Context {
  90 #ifdef MSCRYPTOAPI
  91     unsigned long hHash;
  92 #else
  93     MD5_Core_State core;
  94     unsigned char block[64];
  95     int blkused;
  96     uint32 lenhi, lenlo;
  97 #endif
  98 };
  99
 100 void MD5Init(struct MD5Context *context);
 101 void MD5Update(struct MD5Context *context, unsigned char const *buf,
 102                unsigned len);
 103 void MD5Final(unsigned char digest[16], struct MD5Context *context);
 104
 105 typedef struct {
 106     uint32 h[5];
 107     unsigned char block[64];
 108     int blkused;
 109     uint32 lenhi, lenlo;
 110 } SHA_State;
 111 void SHA_Init(SHA_State * s);
 112 void SHA_Bytes(SHA_State * s, void *p, int len);
 113 void SHA_Final(SHA_State * s, unsigned char *output);
 114 void SHA_Simple(void *p, int len, unsigned char *output);
 115
 116 void hmac_sha1_simple(void *key, int keylen, void *data, int datalen,
 117                       unsigned char *output);
 118
 119 typedef struct {
 120     uint64 h[8];
 121     unsigned char block[128];
 122     int blkused;
 123     uint32 len[4];
 124 } SHA512_State;
 125 void SHA512_Init(SHA512_State * s);
 126 void SHA512_Bytes(SHA512_State * s, const void *p, int len);
 127 void SHA512_Final(SHA512_State * s, unsigned char *output);
 128 void SHA512_Simple(const void *p, int len, unsigned char *output);
 129
 130 struct ssh_cipher {
 131     void *(*make_context)(void);
 132     void (*free_context)(void *);
 133     void (*sesskey) (void *, unsigned char *key);       /* for ssh 1 */
 134     void (*encrypt) (void *, unsigned char *blk, int len);
 135     void (*decrypt) (void *, unsigned char *blk, int len);
 136     int blksize;
 137     char *text_name;
 138 };
 139
 140 struct ssh2_cipher {
 141     void *(*make_context)(void);
 142     void (*free_context)(void *);
 143     void (*setiv) (void *, unsigned char *key); /* for ssh 2 */
 144     void (*setkey) (void *, unsigned char *key);/* for ssh 2 */
 145     void (*encrypt) (void *, unsigned char *blk, int len);
 146     void (*decrypt) (void *, unsigned char *blk, int len);
 147     char *name;
 148     int blksize;
 149     int keylen;
 150     char *text_name;
 151 };
 152
 153 struct ssh2_ciphers {
 154     int nciphers;
 155     const struct ssh2_cipher *const *list;
 156 };
 157
 158 struct ssh_mac {
 159     void *(*make_context)(void);
 160     void (*free_context)(void *);
 161     void (*setkey) (void *, unsigned char *key);
 162     void (*generate) (void *, unsigned char *blk, int len, unsigned long seq);
 163     int (*verify) (void *, unsigned char *blk, int len, unsigned long seq);
 164     char *name;
 165     int len;
 166 };
 167
 168 struct ssh_kex {
 169     /*
 170      * Plugging in another KEX algorithm requires structural chaos,
 171      * so it's hard to abstract them into nice little structures
 172      * like this. Hence, for the moment, this is just a
 173      * placeholder. I claim justification in the fact that OpenSSH
 174      * does this too :-)
 175      */
 176     char *name;
 177 };
 178
 179 struct ssh_signkey {
 180     void *(*newkey) (char *data, int len);
 181     void (*freekey) (void *key);
 182     char *(*fmtkey) (void *key);
 183     unsigned char *(*public_blob) (void *key, int *len);
 184     unsigned char *(*private_blob) (void *key, int *len);
 185     void *(*createkey) (unsigned char *pub_blob, int pub_len,
 186                         unsigned char *priv_blob, int priv_len);
 187     void *(*openssh_createkey) (unsigned char **blob, int *len);
 188     int (*openssh_fmtkey) (void *key, unsigned char *blob, int len);
 189     int (*pubkey_bits) (void *blob, int len);
 190     char *(*fingerprint) (void *key);
 191     int (*verifysig) (void *key, char *sig, int siglen,
 192                       char *data, int datalen);
 193     unsigned char *(*sign) (void *key, char *data, int datalen,
 194                             int *siglen);
 195     char *name;
 196     char *keytype;                     /* for host key cache */
 197 };
 198
 199 struct ssh_compress {
 200     char *name;
 201     void *(*compress_init) (void);
 202     void (*compress_cleanup) (void *);
 203     int (*compress) (void *, unsigned char *block, int len,
 204                      unsigned char **outblock, int *outlen);
 205     void *(*decompress_init) (void);
 206     void (*decompress_cleanup) (void *);
 207     int (*decompress) (void *, unsigned char *block, int len,
 208                        unsigned char **outblock, int *outlen);
 209     int (*disable_compression) (void *);
 210     char *text_name;
 211 };
 212
 213 struct ssh2_userkey {
 214     const struct ssh_signkey *alg;     /* the key algorithm */
 215     void *data;                        /* the key data */
 216     char *comment;                     /* the key comment */
 217 };
 218
 219 extern const struct ssh_cipher ssh_3des;
 220 extern const struct ssh_cipher ssh_des;
 221 extern const struct ssh_cipher ssh_blowfish_ssh1;
 222 extern const struct ssh2_ciphers ssh2_3des;
 223 extern const struct ssh2_ciphers ssh2_des;
 224 extern const struct ssh2_ciphers ssh2_aes;
 225 extern const struct ssh2_ciphers ssh2_blowfish;
 226 extern const struct ssh_kex ssh_diffiehellman;
 227 extern const struct ssh_kex ssh_diffiehellman_gex;
 228 extern const struct ssh_signkey ssh_dss;
 229 extern const struct ssh_signkey ssh_rsa;
 230 extern const struct ssh_mac ssh_md5;
 231 extern const struct ssh_mac ssh_sha1;
 232 extern const struct ssh_mac ssh_sha1_buggy;
 233
 234 /*
 235  * PuTTY version number formatted as an SSH version string.
 236  */
 237 extern char sshver[];
 238
 239 /*
 240  * Gross hack: pscp will try to start SFTP but fall back to scp1 if
 241  * that fails. This variable is the means by which scp.c can reach
 242  * into the SSH code and find out which one it got.
 243  */
 244 extern int ssh_fallback_cmd(void *handle);
 245
 246 #ifndef MSCRYPTOAPI
 247 void SHATransform(word32 * digest, word32 * data);
 248 #endif
 249
 250 int random_byte(void);
 251 void random_add_noise(void *noise, int length);
 252 void random_add_heavynoise(void *noise, int length);
 253
 254 void logevent(void *, const char *);
 255
 256 /* Allocate and register a new channel for port forwarding */
 257 void *new_sock_channel(void *handle, Socket s);
 258 void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
 259
 260 /* Exports from portfwd.c */
 261 extern const char *pfd_newconnect(Socket * s, char *hostname, int port,
 262                                   void *c, const Config *cfg);
 263 /* desthost == NULL indicates dynamic (SOCKS) port forwarding */
 264 extern const char *pfd_addforward(char *desthost, int destport, char *srcaddr,
 265                                   int port, void *backhandle,
 266                                   const Config *cfg);
 267 extern void pfd_close(Socket s);
 268 extern int pfd_send(Socket s, char *data, int len);
 269 extern void pfd_confirm(Socket s);
 270 extern void pfd_unthrottle(Socket s);
 271 extern void pfd_override_throttle(Socket s, int enable);
 272
 273 /* Exports from x11fwd.c */
 274 extern const char *x11_init(Socket *, char *, void *, void *, const char *,
 275                             int, const Config *);
 276 extern void x11_close(Socket);
 277 extern int x11_send(Socket, char *, int);
 278 extern void *x11_invent_auth(char *, int, char *, int, int);
 279 extern void x11_free_auth(void *);
 280 extern void x11_unthrottle(Socket s);
 281 extern void x11_override_throttle(Socket s, int enable);
 282 extern int x11_get_screen_number(char *display);
 283 void x11_get_real_auth(void *authv, char *display);
 284
 285 /* Platfdorm-dependent X11 function */
 286 extern void platform_get_x11_auth(char *display, int *proto,
 287                                   unsigned char *data, int *datalen);
 288
 289 Bignum copybn(Bignum b);
 290 Bignum bn_power_2(int n);
 291 void bn_restore_invariant(Bignum b);
 292 Bignum bignum_from_long(unsigned long n);
 293 void freebn(Bignum b);
 294 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 295 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 296 void decbn(Bignum n);
 297 extern Bignum Zero, One;
 298 Bignum bignum_from_bytes(const unsigned char *data, int nbytes);
 299 int ssh1_read_bignum(const unsigned char *data, Bignum * result);
 300 int bignum_bitcount(Bignum bn);
 301 int ssh1_bignum_length(Bignum bn);
 302 int ssh2_bignum_length(Bignum bn);
 303 int bignum_byte(Bignum bn, int i);
 304 int bignum_bit(Bignum bn, int i);
 305 void bignum_set_bit(Bignum bn, int i, int value);
 306 int ssh1_write_bignum(void *data, Bignum bn);
 307 Bignum biggcd(Bignum a, Bignum b);
 308 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 309 Bignum bignum_add_long(Bignum number, unsigned long addend);
 310 Bignum bigmul(Bignum a, Bignum b);
 311 Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
 312 Bignum bigdiv(Bignum a, Bignum b);
 313 Bignum bigmod(Bignum a, Bignum b);
 314 Bignum modinv(Bignum number, Bignum modulus);
 315 Bignum bignum_bitmask(Bignum number);
 316 Bignum bignum_rshift(Bignum number, int shift);
 317 int bignum_cmp(Bignum a, Bignum b);
 318 char *bignum_decimal(Bignum x);
 319
 320 #ifdef DEBUG
 321 void diagbn(char *prefix, Bignum md);
 322 #endif
 323
 324 void *dh_setup_group1(void);
 325 void *dh_setup_group(Bignum pval, Bignum gval);
 326 void dh_cleanup(void *);
 327 Bignum dh_create_e(void *, int nbits);
 328 Bignum dh_find_K(void *, Bignum f);
 329
 330 int loadrsakey(const Filename *filename, struct RSAKey *key,
 331                char *passphrase, const char **errorstr);
 332 int rsakey_encrypted(const Filename *filename, char **comment);
 333 int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen,
 334                    const char **errorstr);
 335
 336 int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase);
 337
 338 extern int base64_decode_atom(char *atom, unsigned char *out);
 339 extern int base64_lines(int datalen);
 340 extern void base64_encode_atom(unsigned char *data, int n, char *out);
 341 extern void base64_encode(FILE *fp, unsigned char *data, int datalen, int cpl);
 342
 343 /* ssh2_load_userkey can return this as an error */
 344 extern struct ssh2_userkey ssh2_wrong_passphrase;
 345 #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
 346
 347 int ssh2_userkey_encrypted(const Filename *filename, char **comment);
 348 struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
 349                                        char *passphrase, const char **errorstr);
 350 char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
 351                            int *pub_blob_len, const char **errorstr);
 352 int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key,
 353                       char *passphrase);
 354 const struct ssh_signkey *find_pubkey_alg(const char *name);
 355
 356 enum {
 357     SSH_KEYTYPE_UNOPENABLE,
 358     SSH_KEYTYPE_UNKNOWN,
 359     SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
 360     SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
 361 };
 362 int key_type(const Filename *filename);
 363 char *key_type_to_str(int type);
 364
 365 int import_possible(int type);
 366 int import_target_type(int type);
 367 int import_encrypted(const Filename *filename, int type, char **comment);
 368 int import_ssh1(const Filename *filename, int type,
 369                 struct RSAKey *key, char *passphrase);
 370 struct ssh2_userkey *import_ssh2(const Filename *filename, int type,
 371                                  char *passphrase);
 372 int export_ssh1(const Filename *filename, int type,
 373                 struct RSAKey *key, char *passphrase);
 374 int export_ssh2(const Filename *filename, int type,
 375                 struct ssh2_userkey *key, char *passphrase);
 376
 377 void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 378 void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 379 void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
 380                               unsigned char *blk, int len);
 381 void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
 382                               unsigned char *blk, int len);
 383 void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
 384                            int len);
 385 void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
 386                            int len);
 387
 388 void des_encrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
 389 void des_decrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
 390
 391 /*
 392  * For progress updates in the key generation utility.
 393  */
 394 #define PROGFN_INITIALISE 1
 395 #define PROGFN_LIN_PHASE 2
 396 #define PROGFN_EXP_PHASE 3
 397 #define PROGFN_PHASE_EXTENT 4
 398 #define PROGFN_READY 5
 399 #define PROGFN_PROGRESS 6
 400 typedef void (*progfn_t) (void *param, int action, int phase, int progress);
 401
 402 int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
 403                  void *pfnparam);
 404 int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
 405                  void *pfnparam);
 406 Bignum primegen(int bits, int modulus, int residue, Bignum factor,
 407                 int phase, progfn_t pfn, void *pfnparam);
 408
 409
 410 /*
 411  * zlib compression.
 412  */
 413 void *zlib_compress_init(void);
 414 void zlib_compress_cleanup(void *);
 415 void *zlib_decompress_init(void);
 416 void zlib_decompress_cleanup(void *);
 417 int zlib_compress_block(void *, unsigned char *block, int len,
 418                         unsigned char **outblock, int *outlen);
 419 int zlib_decompress_block(void *, unsigned char *block, int len,
 420                           unsigned char **outblock, int *outlen);
 421
 422 /*
 423  * SSH1 agent messages.
 424  */
 425 #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES    1
 426 #define SSH1_AGENT_RSA_IDENTITIES_ANSWER      2
 427 #define SSH1_AGENTC_RSA_CHALLENGE             3
 428 #define SSH1_AGENT_RSA_RESPONSE               4
 429 #define SSH1_AGENTC_ADD_RSA_IDENTITY          7
 430 #define SSH1_AGENTC_REMOVE_RSA_IDENTITY       8
 431 #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
 432
 433 /*
 434  * Messages common to SSH1 and OpenSSH's SSH2.
 435  */
 436 #define SSH_AGENT_FAILURE                    5
 437 #define SSH_AGENT_SUCCESS                    6
 438
 439 /*
 440  * OpenSSH's SSH2 agent messages.
 441  */
 442 #define SSH2_AGENTC_REQUEST_IDENTITIES          11
 443 #define SSH2_AGENT_IDENTITIES_ANSWER            12
 444 #define SSH2_AGENTC_SIGN_REQUEST                13
 445 #define SSH2_AGENT_SIGN_RESPONSE                14
 446 #define SSH2_AGENTC_ADD_IDENTITY                17
 447 #define SSH2_AGENTC_REMOVE_IDENTITY             18
 448 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES       19
 449
 450 /*
 451  * Need this to warn about support for the original SSH2 keyfile
 452  * format.
 453  */
 454 void old_keyfile_warning(void);