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 "tree234.h"
   6 #include "network.h"
   7 #include "int64.h"
   8 #include "misc.h"
   9
  10 struct ssh_channel;
  11
  12 extern void sshfwd_close(struct ssh_channel *c);
  13 extern int sshfwd_write(struct ssh_channel *c, char *, int);
  14 extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);
  15
  16 /*
  17  * Useful thing.
  18  */
  19 #ifndef lenof
  20 #define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
  21 #endif
  22
  23 #define SSH_CIPHER_IDEA         1
  24 #define SSH_CIPHER_DES          2
  25 #define SSH_CIPHER_3DES         3
  26 #define SSH_CIPHER_BLOWFISH     6
  27
  28 #ifdef MSCRYPTOAPI
  29 #define APIEXTRA 8
  30 #else
  31 #define APIEXTRA 0
  32 #endif
  33
  34 #ifndef BIGNUM_INTERNAL
  35 typedef void *Bignum;
  36 #endif
  37
  38 struct RSAKey {
  39     int bits;
  40     int bytes;
  41 #ifdef MSCRYPTOAPI
  42     unsigned long exponent;
  43     unsigned char *modulus;
  44 #else
  45     Bignum modulus;
  46     Bignum exponent;
  47     Bignum private_exponent;
  48     Bignum p;
  49     Bignum q;
  50     Bignum iqmp;
  51 #endif
  52     char *comment;
  53 };
  54
  55 struct dss_key {
  56     Bignum p, q, g, y, x;
  57 };
  58
  59 int makekey(unsigned char *data, int len, struct RSAKey *result,
  60             unsigned char **keystr, int order);
  61 int makeprivate(unsigned char *data, int len, struct RSAKey *result);
  62 int rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  63 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  64 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  65 void rsasanitise(struct RSAKey *key);
  66 int rsastr_len(struct RSAKey *key);
  67 void rsastr_fmt(char *str, struct RSAKey *key);
  68 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  69 int rsa_verify(struct RSAKey *key);
  70 unsigned char *rsa_public_blob(struct RSAKey *key, int *len);
  71 int rsa_public_blob_len(void *data, int maxlen);
  72 void freersakey(struct RSAKey *key);
  73
  74 #ifndef PUTTY_UINT32_DEFINED
  75 /* This makes assumptions about the int type. */
  76 typedef unsigned int uint32;
  77 #define PUTTY_UINT32_DEFINED
  78 #endif
  79 typedef uint32 word32;
  80
  81 unsigned long crc32_compute(const void *s, size_t len);
  82 unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);
  83
  84 /* SSH CRC compensation attack detector */
  85 void *crcda_make_context(void);
  86 void crcda_free_context(void *handle);
  87 int detect_attack(void *handle, unsigned char *buf, uint32 len,
  88                   unsigned char *IV);
  89
  90 /*
  91  * SSH2 RSA key exchange functions
  92  */
  93 struct ssh_hash;
  94 void *ssh_rsakex_newkey(char *data, int len);
  95 void ssh_rsakex_freekey(void *key);
  96 int ssh_rsakex_klen(void *key);
  97 void ssh_rsakex_encrypt(const struct ssh_hash *h, unsigned char *in, int inlen,
  98                         unsigned char *out, int outlen,
  99                         void *key);
 100
 101 typedef struct {
 102     uint32 h[4];
 103 } MD5_Core_State;
 104
 105 struct MD5Context {
 106 #ifdef MSCRYPTOAPI
 107     unsigned long hHash;
 108 #else
 109     MD5_Core_State core;
 110     unsigned char block[64];
 111     int blkused;
 112     uint32 lenhi, lenlo;
 113 #endif
 114 };
 115
 116 void MD5Init(struct MD5Context *context);
 117 void MD5Update(struct MD5Context *context, unsigned char const *buf,
 118                unsigned len);
 119 void MD5Final(unsigned char digest[16], struct MD5Context *context);
 120 void MD5Simple(void const *p, unsigned len, unsigned char output[16]);
 121
 122 void *hmacmd5_make_context(void);
 123 void hmacmd5_free_context(void *handle);
 124 void hmacmd5_key(void *handle, void const *key, int len);
 125 void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len,
 126                      unsigned char *hmac);
 127
 128 typedef struct {
 129     uint32 h[5];
 130     unsigned char block[64];
 131     int blkused;
 132     uint32 lenhi, lenlo;
 133 } SHA_State;
 134 void SHA_Init(SHA_State * s);
 135 void SHA_Bytes(SHA_State * s, void *p, int len);
 136 void SHA_Final(SHA_State * s, unsigned char *output);
 137 void SHA_Simple(void *p, int len, unsigned char *output);
 138
 139 void hmac_sha1_simple(void *key, int keylen, void *data, int datalen,
 140                       unsigned char *output);
 141 typedef struct {
 142     uint32 h[8];
 143     unsigned char block[64];
 144     int blkused;
 145     uint32 lenhi, lenlo;
 146 } SHA256_State;
 147 void SHA256_Init(SHA256_State * s);
 148 void SHA256_Bytes(SHA256_State * s, const void *p, int len);
 149 void SHA256_Final(SHA256_State * s, unsigned char *output);
 150 void SHA256_Simple(const void *p, int len, unsigned char *output);
 151
 152 typedef struct {
 153     uint64 h[8];
 154     unsigned char block[128];
 155     int blkused;
 156     uint32 len[4];
 157 } SHA512_State;
 158 void SHA512_Init(SHA512_State * s);
 159 void SHA512_Bytes(SHA512_State * s, const void *p, int len);
 160 void SHA512_Final(SHA512_State * s, unsigned char *output);
 161 void SHA512_Simple(const void *p, int len, unsigned char *output);
 162
 163 struct ssh_cipher {
 164     void *(*make_context)(void);
 165     void (*free_context)(void *);
 166     void (*sesskey) (void *, unsigned char *key);       /* for SSH-1 */
 167     void (*encrypt) (void *, unsigned char *blk, int len);
 168     void (*decrypt) (void *, unsigned char *blk, int len);
 169     int blksize;
 170     char *text_name;
 171 };
 172
 173 struct ssh2_cipher {
 174     void *(*make_context)(void);
 175     void (*free_context)(void *);
 176     void (*setiv) (void *, unsigned char *key); /* for SSH-2 */
 177     void (*setkey) (void *, unsigned char *key);/* for SSH-2 */
 178     void (*encrypt) (void *, unsigned char *blk, int len);
 179     void (*decrypt) (void *, unsigned char *blk, int len);
 180     char *name;
 181     int blksize;
 182     int keylen;
 183     unsigned int flags;
 184 #define SSH_CIPHER_IS_CBC       1
 185     char *text_name;
 186 };
 187
 188 struct ssh2_ciphers {
 189     int nciphers;
 190     const struct ssh2_cipher *const *list;
 191 };
 192
 193 struct ssh_mac {
 194     void *(*make_context)(void);
 195     void (*free_context)(void *);
 196     void (*setkey) (void *, unsigned char *key);
 197     /* whole-packet operations */
 198     void (*generate) (void *, unsigned char *blk, int len, unsigned long seq);
 199     int (*verify) (void *, unsigned char *blk, int len, unsigned long seq);
 200     /* partial-packet operations */
 201     void (*start) (void *);
 202     void (*bytes) (void *, unsigned char const *, int);
 203     void (*genresult) (void *, unsigned char *);
 204     int (*verresult) (void *, unsigned char const *);
 205     char *name;
 206     int len;
 207     char *text_name;
 208 };
 209
 210 struct ssh_hash {
 211     void *(*init)(void); /* also allocates context */
 212     void (*bytes)(void *, void *, int);
 213     void (*final)(void *, unsigned char *); /* also frees context */
 214     int hlen; /* output length in bytes */
 215     char *text_name;
 216 };
 217
 218 struct ssh_kex {
 219     char *name, *groupname;
 220     enum { KEXTYPE_DH, KEXTYPE_RSA } main_type;
 221     /* For DH */
 222     const unsigned char *pdata, *gdata; /* NULL means group exchange */
 223     int plen, glen;
 224     const struct ssh_hash *hash;
 225 };
 226
 227 struct ssh_kexes {
 228     int nkexes;
 229     const struct ssh_kex *const *list;
 230 };
 231
 232 struct ssh_signkey {
 233     void *(*newkey) (char *data, int len);
 234     void (*freekey) (void *key);
 235     char *(*fmtkey) (void *key);
 236     unsigned char *(*public_blob) (void *key, int *len);
 237     unsigned char *(*private_blob) (void *key, int *len);
 238     void *(*createkey) (unsigned char *pub_blob, int pub_len,
 239                         unsigned char *priv_blob, int priv_len);
 240     void *(*openssh_createkey) (unsigned char **blob, int *len);
 241     int (*openssh_fmtkey) (void *key, unsigned char *blob, int len);
 242     int (*pubkey_bits) (void *blob, int len);
 243     char *(*fingerprint) (void *key);
 244     int (*verifysig) (void *key, char *sig, int siglen,
 245                       char *data, int datalen);
 246     unsigned char *(*sign) (void *key, char *data, int datalen,
 247                             int *siglen);
 248     char *name;
 249     char *keytype;                     /* for host key cache */
 250 };
 251
 252 struct ssh_compress {
 253     char *name;
 254     void *(*compress_init) (void);
 255     void (*compress_cleanup) (void *);
 256     int (*compress) (void *, unsigned char *block, int len,
 257                      unsigned char **outblock, int *outlen);
 258     void *(*decompress_init) (void);
 259     void (*decompress_cleanup) (void *);
 260     int (*decompress) (void *, unsigned char *block, int len,
 261                        unsigned char **outblock, int *outlen);
 262     int (*disable_compression) (void *);
 263     char *text_name;
 264 };
 265
 266 struct ssh2_userkey {
 267     const struct ssh_signkey *alg;     /* the key algorithm */
 268     void *data;                        /* the key data */
 269     char *comment;                     /* the key comment */
 270 };
 271
 272 /* The maximum length of any hash algorithm used in kex. (bytes) */
 273 #define SSH2_KEX_MAX_HASH_LEN (32) /* SHA-256 */
 274
 275 extern const struct ssh_cipher ssh_3des;
 276 extern const struct ssh_cipher ssh_des;
 277 extern const struct ssh_cipher ssh_blowfish_ssh1;
 278 extern const struct ssh2_ciphers ssh2_3des;
 279 extern const struct ssh2_ciphers ssh2_des;
 280 extern const struct ssh2_ciphers ssh2_aes;
 281 extern const struct ssh2_ciphers ssh2_blowfish;
 282 extern const struct ssh2_ciphers ssh2_arcfour;
 283 extern const struct ssh_hash ssh_sha1;
 284 extern const struct ssh_hash ssh_sha256;
 285 extern const struct ssh_kexes ssh_diffiehellman_group1;
 286 extern const struct ssh_kexes ssh_diffiehellman_group14;
 287 extern const struct ssh_kexes ssh_diffiehellman_gex;
 288 extern const struct ssh_kexes ssh_rsa_kex;
 289 extern const struct ssh_signkey ssh_dss;
 290 extern const struct ssh_signkey ssh_rsa;
 291 extern const struct ssh_mac ssh_hmac_md5;
 292 extern const struct ssh_mac ssh_hmac_sha1;
 293 extern const struct ssh_mac ssh_hmac_sha1_buggy;
 294 extern const struct ssh_mac ssh_hmac_sha1_96;
 295 extern const struct ssh_mac ssh_hmac_sha1_96_buggy;
 296
 297 void *aes_make_context(void);
 298 void aes_free_context(void *handle);
 299 void aes128_key(void *handle, unsigned char *key);
 300 void aes192_key(void *handle, unsigned char *key);
 301 void aes256_key(void *handle, unsigned char *key);
 302 void aes_iv(void *handle, unsigned char *iv);
 303 void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len);
 304 void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len);
 305
 306 /*
 307  * PuTTY version number formatted as an SSH version string.
 308  */
 309 extern char sshver[];
 310
 311 /*
 312  * Gross hack: pscp will try to start SFTP but fall back to scp1 if
 313  * that fails. This variable is the means by which scp.c can reach
 314  * into the SSH code and find out which one it got.
 315  */
 316 extern int ssh_fallback_cmd(void *handle);
 317
 318 #ifndef MSCRYPTOAPI
 319 void SHATransform(word32 * digest, word32 * data);
 320 #endif
 321
 322 int random_byte(void);
 323 void random_add_noise(void *noise, int length);
 324 void random_add_heavynoise(void *noise, int length);
 325
 326 void logevent(void *, const char *);
 327
 328 /* Allocate and register a new channel for port forwarding */
 329 void *new_sock_channel(void *handle, Socket s);
 330 void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
 331
 332 /* Exports from portfwd.c */
 333 extern const char *pfd_newconnect(Socket * s, char *hostname, int port,
 334                                   void *c, const Config *cfg,
 335                                   int addressfamily);
 336 /* desthost == NULL indicates dynamic (SOCKS) port forwarding */
 337 extern const char *pfd_addforward(char *desthost, int destport, char *srcaddr,
 338                                   int port, void *backhandle,
 339                                   const Config *cfg, void **sockdata,
 340                                   int address_family);
 341 extern void pfd_close(Socket s);
 342 extern void pfd_terminate(void *sockdata);
 343 extern int pfd_send(Socket s, char *data, int len);
 344 extern void pfd_confirm(Socket s);
 345 extern void pfd_unthrottle(Socket s);
 346 extern void pfd_override_throttle(Socket s, int enable);
 347
 348 /* Exports from x11fwd.c */
 349 enum {
 350     X11_TRANS_IPV4 = 0, X11_TRANS_IPV6 = 6, X11_TRANS_UNIX = 256
 351 };
 352 struct X11Display {
 353     /* Broken-down components of the display name itself */
 354     int unixdomain;
 355     char *hostname;
 356     int displaynum;
 357     int screennum;
 358     /* OSX sometimes replaces all the above with a full Unix-socket pathname */
 359     char *unixsocketpath;
 360
 361     /* PuTTY networking SockAddr to connect to the display, and associated
 362      * gubbins */
 363     SockAddr addr;
 364     int port;
 365     char *realhost;
 366
 367     /* Auth details we invented for the virtual display on the SSH server. */
 368     int remoteauthproto;
 369     unsigned char *remoteauthdata;
 370     int remoteauthdatalen;
 371     char *remoteauthprotoname;
 372     char *remoteauthdatastring;
 373
 374     /* Our local auth details for talking to the real X display. */
 375     int localauthproto;
 376     unsigned char *localauthdata;
 377     int localauthdatalen;
 378
 379     /*
 380      * Used inside x11fwd.c to remember recently seen
 381      * XDM-AUTHORIZATION-1 strings, to avoid replay attacks.
 382      */
 383     tree234 *xdmseen;
 384 };
 385 /*
 386  * x11_setup_display() parses the display variable and fills in an
 387  * X11Display structure. Some remote auth details are invented;
 388  * the supplied authtype parameter configures the preferred
 389  * authorisation protocol to use at the remote end. The local auth
 390  * details are looked up by calling platform_get_x11_auth.
 391  */
 392 extern struct X11Display *x11_setup_display(char *display, int authtype,
 393                                             const Config *);
 394 void x11_free_display(struct X11Display *disp);
 395 extern const char *x11_init(Socket *, struct X11Display *, void *,
 396                             const char *, int, const Config *);
 397 extern void x11_close(Socket);
 398 extern int x11_send(Socket, char *, int);
 399 extern void x11_unthrottle(Socket s);
 400 extern void x11_override_throttle(Socket s, int enable);
 401 char *x11_display(const char *display);
 402 /* Platform-dependent X11 functions */
 403 extern void platform_get_x11_auth(struct X11Display *display,
 404                                   const Config *);
 405     /* examine a mostly-filled-in X11Display and fill in localauth* */
 406 extern const int platform_uses_x11_unix_by_default;
 407     /* choose default X transport in the absence of a specified one */
 408 SockAddr platform_get_x11_unix_address(const char *path, int displaynum);
 409     /* make up a SockAddr naming the address for displaynum */
 410 char *platform_get_x_display(void);
 411     /* allocated local X display string, if any */
 412 /* Callbacks in x11.c usable _by_ platform X11 functions */
 413 /*
 414  * This function does the job of platform_get_x11_auth, provided
 415  * it is told where to find a normally formatted .Xauthority file:
 416  * it opens that file, parses it to find an auth record which
 417  * matches the display details in "display", and fills in the
 418  * localauth fields.
 419  *
 420  * It is expected that most implementations of
 421  * platform_get_x11_auth() will work by finding their system's
 422  * .Xauthority file, adjusting the display details if necessary
 423  * for local oddities like Unix-domain socket transport, and
 424  * calling this function to do the rest of the work.
 425  */
 426 void x11_get_auth_from_authfile(struct X11Display *display,
 427                                 const char *authfilename);
 428
 429 Bignum copybn(Bignum b);
 430 Bignum bn_power_2(int n);
 431 void bn_restore_invariant(Bignum b);
 432 Bignum bignum_from_long(unsigned long n);
 433 void freebn(Bignum b);
 434 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 435 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 436 void decbn(Bignum n);
 437 extern Bignum Zero, One;
 438 Bignum bignum_from_bytes(const unsigned char *data, int nbytes);
 439 int ssh1_read_bignum(const unsigned char *data, int len, Bignum * result);
 440 int bignum_bitcount(Bignum bn);
 441 int ssh1_bignum_length(Bignum bn);
 442 int ssh2_bignum_length(Bignum bn);
 443 int bignum_byte(Bignum bn, int i);
 444 int bignum_bit(Bignum bn, int i);
 445 void bignum_set_bit(Bignum bn, int i, int value);
 446 int ssh1_write_bignum(void *data, Bignum bn);
 447 Bignum biggcd(Bignum a, Bignum b);
 448 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 449 Bignum bignum_add_long(Bignum number, unsigned long addend);
 450 Bignum bigmul(Bignum a, Bignum b);
 451 Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
 452 Bignum bigdiv(Bignum a, Bignum b);
 453 Bignum bigmod(Bignum a, Bignum b);
 454 Bignum modinv(Bignum number, Bignum modulus);
 455 Bignum bignum_bitmask(Bignum number);
 456 Bignum bignum_rshift(Bignum number, int shift);
 457 int bignum_cmp(Bignum a, Bignum b);
 458 char *bignum_decimal(Bignum x);
 459
 460 #ifdef DEBUG
 461 void diagbn(char *prefix, Bignum md);
 462 #endif
 463
 464 void *dh_setup_group(const struct ssh_kex *kex);
 465 void *dh_setup_gex(Bignum pval, Bignum gval);
 466 void dh_cleanup(void *);
 467 Bignum dh_create_e(void *, int nbits);
 468 Bignum dh_find_K(void *, Bignum f);
 469
 470 int loadrsakey(const Filename *filename, struct RSAKey *key,
 471                char *passphrase, const char **errorstr);
 472 int rsakey_encrypted(const Filename *filename, char **comment);
 473 int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen,
 474                    char **commentptr, const char **errorstr);
 475
 476 int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase);
 477
 478 extern int base64_decode_atom(char *atom, unsigned char *out);
 479 extern int base64_lines(int datalen);
 480 extern void base64_encode_atom(unsigned char *data, int n, char *out);
 481 extern void base64_encode(FILE *fp, unsigned char *data, int datalen, int cpl);
 482
 483 /* ssh2_load_userkey can return this as an error */
 484 extern struct ssh2_userkey ssh2_wrong_passphrase;
 485 #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
 486
 487 int ssh2_userkey_encrypted(const Filename *filename, char **comment);
 488 struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
 489                                        char *passphrase, const char **errorstr);
 490 unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
 491                                     int *pub_blob_len, char **commentptr,
 492                                     const char **errorstr);
 493 int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key,
 494                       char *passphrase);
 495 const struct ssh_signkey *find_pubkey_alg(const char *name);
 496
 497 enum {
 498     SSH_KEYTYPE_UNOPENABLE,
 499     SSH_KEYTYPE_UNKNOWN,
 500     SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
 501     SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
 502 };
 503 int key_type(const Filename *filename);
 504 char *key_type_to_str(int type);
 505
 506 int import_possible(int type);
 507 int import_target_type(int type);
 508 int import_encrypted(const Filename *filename, int type, char **comment);
 509 int import_ssh1(const Filename *filename, int type,
 510                 struct RSAKey *key, char *passphrase, const char **errmsg_p);
 511 struct ssh2_userkey *import_ssh2(const Filename *filename, int type,
 512                                  char *passphrase, const char **errmsg_p);
 513 int export_ssh1(const Filename *filename, int type,
 514                 struct RSAKey *key, char *passphrase);
 515 int export_ssh2(const Filename *filename, int type,
 516                 struct ssh2_userkey *key, char *passphrase);
 517
 518 void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 519 void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 520 void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
 521                               unsigned char *blk, int len);
 522 void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
 523                               unsigned char *blk, int len);
 524 void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
 525                            int len);
 526 void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
 527                            int len);
 528
 529 void des_encrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
 530 void des_decrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
 531
 532 /*
 533  * For progress updates in the key generation utility.
 534  */
 535 #define PROGFN_INITIALISE 1
 536 #define PROGFN_LIN_PHASE 2
 537 #define PROGFN_EXP_PHASE 3
 538 #define PROGFN_PHASE_EXTENT 4
 539 #define PROGFN_READY 5
 540 #define PROGFN_PROGRESS 6
 541 typedef void (*progfn_t) (void *param, int action, int phase, int progress);
 542
 543 int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
 544                  void *pfnparam);
 545 int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
 546                  void *pfnparam);
 547 Bignum primegen(int bits, int modulus, int residue, Bignum factor,
 548                 int phase, progfn_t pfn, void *pfnparam);
 549
 550
 551 /*
 552  * zlib compression.
 553  */
 554 void *zlib_compress_init(void);
 555 void zlib_compress_cleanup(void *);
 556 void *zlib_decompress_init(void);
 557 void zlib_decompress_cleanup(void *);
 558 int zlib_compress_block(void *, unsigned char *block, int len,
 559                         unsigned char **outblock, int *outlen);
 560 int zlib_decompress_block(void *, unsigned char *block, int len,
 561                           unsigned char **outblock, int *outlen);
 562
 563 /*
 564  * SSH-1 agent messages.
 565  */
 566 #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES    1
 567 #define SSH1_AGENT_RSA_IDENTITIES_ANSWER      2
 568 #define SSH1_AGENTC_RSA_CHALLENGE             3
 569 #define SSH1_AGENT_RSA_RESPONSE               4
 570 #define SSH1_AGENTC_ADD_RSA_IDENTITY          7
 571 #define SSH1_AGENTC_REMOVE_RSA_IDENTITY       8
 572 #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
 573
 574 /*
 575  * Messages common to SSH-1 and OpenSSH's SSH-2.
 576  */
 577 #define SSH_AGENT_FAILURE                    5
 578 #define SSH_AGENT_SUCCESS                    6
 579
 580 /*
 581  * OpenSSH's SSH-2 agent messages.
 582  */
 583 #define SSH2_AGENTC_REQUEST_IDENTITIES          11
 584 #define SSH2_AGENT_IDENTITIES_ANSWER            12
 585 #define SSH2_AGENTC_SIGN_REQUEST                13
 586 #define SSH2_AGENT_SIGN_RESPONSE                14
 587 #define SSH2_AGENTC_ADD_IDENTITY                17
 588 #define SSH2_AGENTC_REMOVE_IDENTITY             18
 589 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES       19
 590
 591 /*
 592  * Need this to warn about support for the original SSH-2 keyfile
 593  * format.
 594  */
 595 void old_keyfile_warning(void);