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

   1 #include <string.h>
   2
   3 #include "puttymem.h"
   4 #include "network.h"
   5
   6 extern void sshfwd_close(struct ssh_channel *c);
   7 extern int sshfwd_write(struct ssh_channel *c, char *, int);
   8 extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);
   9
  10 /*
  11  * Useful thing.
  12  */
  13 #ifndef lenof
  14 #define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
  15 #endif
  16
  17 #define SSH_CIPHER_IDEA         1
  18 #define SSH_CIPHER_DES          2
  19 #define SSH_CIPHER_3DES         3
  20 #define SSH_CIPHER_BLOWFISH     6
  21
  22 #ifdef MSCRYPTOAPI
  23 #define APIEXTRA 8
  24 #else
  25 #define APIEXTRA 0
  26 #endif
  27
  28 #ifndef BIGNUM_INTERNAL
  29 typedef void *Bignum;
  30 #endif
  31
  32 struct RSAKey {
  33     int bits;
  34     int bytes;
  35 #ifdef MSCRYPTOAPI
  36     unsigned long exponent;
  37     unsigned char *modulus;
  38 #else
  39     Bignum modulus;
  40     Bignum exponent;
  41     Bignum private_exponent;
  42     Bignum p;
  43     Bignum q;
  44     Bignum iqmp;
  45 #endif
  46     char *comment;
  47 };
  48
  49 int makekey(unsigned char *data, struct RSAKey *result,
  50             unsigned char **keystr, int order);
  51 int makeprivate(unsigned char *data, struct RSAKey *result);
  52 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  53 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  54 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  55 void rsasanitise(struct RSAKey *key);
  56 int rsastr_len(struct RSAKey *key);
  57 void rsastr_fmt(char *str, struct RSAKey *key);
  58 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  59 int rsa_verify(struct RSAKey *key);
  60 void freersakey(struct RSAKey *key);
  61
  62 typedef unsigned int word32;
  63 typedef unsigned int uint32;
  64
  65 unsigned long crc32(const void *s, size_t len);
  66
  67 typedef struct {
  68     uint32 h[4];
  69 } MD5_Core_State;
  70
  71 struct MD5Context {
  72 #ifdef MSCRYPTOAPI
  73     unsigned long hHash;
  74 #else
  75     MD5_Core_State core;
  76     unsigned char block[64];
  77     int blkused;
  78     uint32 lenhi, lenlo;
  79 #endif
  80 };
  81
  82 void MD5Init(struct MD5Context *context);
  83 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  84                unsigned len);
  85 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  86
  87 typedef struct {
  88     uint32 h[5];
  89     unsigned char block[64];
  90     int blkused;
  91     uint32 lenhi, lenlo;
  92 } SHA_State;
  93
  94 void SHA_Init(SHA_State * s);
  95 void SHA_Bytes(SHA_State * s, void *p, int len);
  96 void SHA_Final(SHA_State * s, unsigned char *output);
  97 void SHA_Simple(void *p, int len, unsigned char *output);
  98
  99 struct ssh_cipher {
 100     void (*sesskey) (unsigned char *key);       /* for ssh 1 */
 101     void (*encrypt) (unsigned char *blk, int len);
 102     void (*decrypt) (unsigned char *blk, int len);
 103     int blksize;
 104 };
 105
 106 struct ssh2_cipher {
 107     void (*setcsiv) (unsigned char *key);       /* for ssh 2 */
 108     void (*setcskey) (unsigned char *key);      /* for ssh 2 */
 109     void (*setsciv) (unsigned char *key);       /* for ssh 2 */
 110     void (*setsckey) (unsigned char *key);      /* for ssh 2 */
 111     void (*encrypt) (unsigned char *blk, int len);
 112     void (*decrypt) (unsigned char *blk, int len);
 113     char *name;
 114     int blksize;
 115     int keylen;
 116 };
 117
 118 struct ssh2_ciphers {
 119     int nciphers;
 120     const struct ssh2_cipher *const *list;
 121 };
 122
 123 struct ssh_mac {
 124     void (*setcskey) (unsigned char *key);
 125     void (*setsckey) (unsigned char *key);
 126     void (*generate) (unsigned char *blk, int len, unsigned long seq);
 127     int (*verify) (unsigned char *blk, int len, unsigned long seq);
 128     char *name;
 129     int len;
 130 };
 131
 132 struct ssh_kex {
 133     /*
 134      * Plugging in another KEX algorithm requires structural chaos,
 135      * so it's hard to abstract them into nice little structures
 136      * like this. Hence, for the moment, this is just a
 137      * placeholder. I claim justification in the fact that OpenSSH
 138      * does this too :-)
 139      */
 140     char *name;
 141 };
 142
 143 struct ssh_signkey {
 144     void *(*newkey) (char *data, int len);
 145     void (*freekey) (void *key);
 146     char *(*fmtkey) (void *key);
 147     unsigned char *(*public_blob) (void *key, int *len);
 148     unsigned char *(*private_blob) (void *key, int *len);
 149     void *(*createkey) (unsigned char *pub_blob, int pub_len,
 150                         unsigned char *priv_blob, int priv_len);
 151     void *(*openssh_createkey) (unsigned char **blob, int *len);
 152     int (*openssh_fmtkey) (void *key, unsigned char *blob, int len);
 153     char *(*fingerprint) (void *key);
 154     int (*verifysig) (void *key, char *sig, int siglen,
 155                       char *data, int datalen);
 156     unsigned char *(*sign) (void *key, char *data, int datalen,
 157                             int *siglen);
 158     char *name;
 159     char *keytype;                     /* for host key cache */
 160 };
 161
 162 struct ssh_compress {
 163     char *name;
 164     void (*compress_init) (void);
 165     int (*compress) (unsigned char *block, int len,
 166                      unsigned char **outblock, int *outlen);
 167     void (*decompress_init) (void);
 168     int (*decompress) (unsigned char *block, int len,
 169                        unsigned char **outblock, int *outlen);
 170     int (*disable_compression) (void);
 171 };
 172
 173 struct ssh2_userkey {
 174     const struct ssh_signkey *alg;     /* the key algorithm */
 175     void *data;                        /* the key data */
 176     char *comment;                     /* the key comment */
 177 };
 178
 179 extern const struct ssh_cipher ssh_3des;
 180 extern const struct ssh_cipher ssh_des;
 181 extern const struct ssh_cipher ssh_blowfish_ssh1;
 182 extern const struct ssh2_ciphers ssh2_3des;
 183 extern const struct ssh2_ciphers ssh2_aes;
 184 extern const struct ssh2_ciphers ssh2_blowfish;
 185 extern const struct ssh_kex ssh_diffiehellman;
 186 extern const struct ssh_kex ssh_diffiehellman_gex;
 187 extern const struct ssh_signkey ssh_dss;
 188 extern const struct ssh_signkey ssh_rsa;
 189 extern const struct ssh_mac ssh_md5;
 190 extern const struct ssh_mac ssh_sha1;
 191 extern const struct ssh_mac ssh_sha1_buggy;
 192
 193 /*
 194  * PuTTY version number formatted as an SSH version string.
 195  */
 196 extern char sshver[];
 197
 198 /*
 199  * Gross hack: pscp will try to start SFTP but fall back to scp1 if
 200  * that fails. This variable is the means by which scp.c can reach
 201  * into the SSH code and find out which one it got.
 202  */
 203 extern int ssh_fallback_cmd;
 204
 205 #ifndef MSCRYPTOAPI
 206 void SHATransform(word32 * digest, word32 * data);
 207 #endif
 208
 209 int random_byte(void);
 210 void random_add_noise(void *noise, int length);
 211 void random_add_heavynoise(void *noise, int length);
 212
 213 void logevent(char *);
 214 void *new_sock_channel(Socket s); // allocates and register a new channel for port forwarding
 215 void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
 216
 217 Bignum copybn(Bignum b);
 218 Bignum bn_power_2(int n);
 219 void bn_restore_invariant(Bignum b);
 220 Bignum bignum_from_short(unsigned short n);
 221 void freebn(Bignum b);
 222 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 223 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 224 void decbn(Bignum n);
 225 extern Bignum Zero, One;
 226 Bignum bignum_from_bytes(unsigned char *data, int nbytes);
 227 int ssh1_read_bignum(unsigned char *data, Bignum * result);
 228 int bignum_bitcount(Bignum bn);
 229 int ssh1_bignum_length(Bignum bn);
 230 int ssh2_bignum_length(Bignum bn);
 231 int bignum_byte(Bignum bn, int i);
 232 int bignum_bit(Bignum bn, int i);
 233 void bignum_set_bit(Bignum bn, int i, int value);
 234 int ssh1_write_bignum(void *data, Bignum bn);
 235 Bignum biggcd(Bignum a, Bignum b);
 236 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 237 Bignum bignum_add_long(Bignum number, unsigned long addend);
 238 Bignum bigmul(Bignum a, Bignum b);
 239 Bignum modinv(Bignum number, Bignum modulus);
 240 Bignum bignum_bitmask(Bignum number);
 241 Bignum bignum_rshift(Bignum number, int shift);
 242 int bignum_cmp(Bignum a, Bignum b);
 243 char *bignum_decimal(Bignum x);
 244
 245 void dh_setup_group1(void);
 246 void dh_setup_group(Bignum pval, Bignum gval);
 247 void dh_cleanup(void);
 248 Bignum dh_create_e(int nbits);
 249 Bignum dh_find_K(Bignum f);
 250
 251 int loadrsakey(char *filename, struct RSAKey *key, char *passphrase);
 252 int rsakey_encrypted(char *filename, char **comment);
 253
 254 int saversakey(char *filename, struct RSAKey *key, char *passphrase);
 255
 256 void base64_encode_atom(unsigned char *data, int n, char *out);
 257
 258 /* ssh2_load_userkey can return this as an error */
 259 extern struct ssh2_userkey ssh2_wrong_passphrase;
 260 #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
 261
 262 int ssh2_userkey_encrypted(char *filename, char **comment);
 263 struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase);
 264 char *ssh2_userkey_loadpub(char *filename, char **algorithm,
 265                            int *pub_blob_len);
 266 int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
 267                       char *passphrase);
 268
 269 int keyfile_version(char *filename);
 270
 271 void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 272 void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 273 void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
 274                            int len);
 275 void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
 276                            int len);
 277
 278 /*
 279  * For progress updates in the key generation utility.
 280  */
 281 typedef void (*progfn_t) (void *param, int phase, int progress);
 282
 283 int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
 284                  void *pfnparam);
 285 Bignum primegen(int bits, int modulus, int residue, int phase,
 286                 progfn_t pfn, void *pfnparam);
 287
 288
 289 /*
 290  * zlib compression.
 291  */
 292 void zlib_compress_init(void);
 293 void zlib_decompress_init(void);
 294 int zlib_compress_block(unsigned char *block, int len,
 295                         unsigned char **outblock, int *outlen);
 296 int zlib_decompress_block(unsigned char *block, int len,
 297                           unsigned char **outblock, int *outlen);
 298
 299 /*
 300  * SSH1 agent messages.
 301  */
 302 #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES    1
 303 #define SSH1_AGENT_RSA_IDENTITIES_ANSWER      2
 304 #define SSH1_AGENTC_RSA_CHALLENGE             3
 305 #define SSH1_AGENT_RSA_RESPONSE               4
 306 #define SSH1_AGENTC_ADD_RSA_IDENTITY          7
 307 #define SSH1_AGENTC_REMOVE_RSA_IDENTITY       8
 308 #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
 309
 310 /*
 311  * Messages common to SSH1 and OpenSSH's SSH2.
 312  */
 313 #define SSH_AGENT_FAILURE                    5
 314 #define SSH_AGENT_SUCCESS                    6
 315
 316 /*
 317  * OpenSSH's SSH2 agent messages.
 318  */
 319 #define SSH2_AGENTC_REQUEST_IDENTITIES          11
 320 #define SSH2_AGENT_IDENTITIES_ANSWER            12
 321 #define SSH2_AGENTC_SIGN_REQUEST                13
 322 #define SSH2_AGENT_SIGN_RESPONSE                14
 323 #define SSH2_AGENTC_ADD_IDENTITY                17
 324 #define SSH2_AGENTC_REMOVE_IDENTITY             18
 325 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES       19