crypto/openssh/key.c

   1 /* $OpenBSD: key.c,v 1.122 2014/07/22 01:18:50 dtucker Exp $ */
   2 /*
   3  * placed in the public domain
   4  */
   5
   6 #include "includes.h"
   7
   8 #include <sys/param.h>
   9 #include <sys/types.h>
  10 #include <errno.h>
  11 #include <stdarg.h>
  12 #include <stdio.h>
  13
  14 #define SSH_KEY_NO_DEFINE
  15 #include "key.h"
  16
  17 #include "compat.h"
  18 #include "sshkey.h"
  19 #include "ssherr.h"
  20 #include "log.h"
  21 #include "authfile.h"
  22
  23 void
  24 key_add_private(Key *k)
  25 {
  26         int r;
  27
  28         if ((r = sshkey_add_private(k)) != 0)
  29                 fatal("%s: %s", __func__, ssh_err(r));
  30 }
  31
  32 Key *
  33 key_new_private(int type)
  34 {
  35         Key *ret = NULL;
  36
  37         if ((ret = sshkey_new_private(type)) == NULL)
  38                 fatal("%s: failed", __func__);
  39         return ret;
  40 }
  41
  42 u_char*
  43 key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
  44     u_int *dgst_raw_length)
  45 {
  46         u_char *ret = NULL;
  47         size_t dlen;
  48         int r;
  49
  50         if (dgst_raw_length != NULL)
  51                 *dgst_raw_length = 0;
  52         if ((r = sshkey_fingerprint_raw(k, dgst_type, &ret, &dlen)) != 0)
  53                 fatal("%s: %s", __func__, ssh_err(r));
  54         if (dlen > INT_MAX)
  55                 fatal("%s: giant len %zu", __func__, dlen);
  56         *dgst_raw_length = dlen;
  57         return ret;
  58 }
  59
  60 int
  61 key_read(Key *ret, char **cpp)
  62 {
  63         return sshkey_read(ret, cpp) == 0 ? 1 : -1;
  64 }
  65
  66 int
  67 key_write(const Key *key, FILE *f)
  68 {
  69         return sshkey_write(key, f) == 0 ? 1 : 0;
  70 }
  71
  72 Key *
  73 key_generate(int type, u_int bits)
  74 {
  75         int r;
  76         Key *ret = NULL;
  77
  78         if ((r = sshkey_generate(type, bits, &ret)) != 0)
  79                 fatal("%s: %s", __func__, ssh_err(r));
  80         return ret;
  81 }
  82
  83 void
  84 key_cert_copy(const Key *from_key, Key *to_key)
  85 {
  86         int r;
  87
  88         if ((r = sshkey_cert_copy(from_key, to_key)) != 0)
  89                 fatal("%s: %s", __func__, ssh_err(r));
  90 }
  91
  92 Key *
  93 key_from_private(const Key *k)
  94 {
  95         int r;
  96         Key *ret = NULL;
  97
  98         if ((r = sshkey_from_private(k, &ret)) != 0)
  99                 fatal("%s: %s", __func__, ssh_err(r));
 100         return ret;
 101 }
 102
 103 static void
 104 fatal_on_fatal_errors(int r, const char *func, int extra_fatal)
 105 {
 106         if (r == SSH_ERR_INTERNAL_ERROR ||
 107             r == SSH_ERR_ALLOC_FAIL ||
 108             (extra_fatal != 0 && r == extra_fatal))
 109                 fatal("%s: %s", func, ssh_err(r));
 110 }
 111
 112 Key *
 113 key_from_blob(const u_char *blob, u_int blen)
 114 {
 115         int r;
 116         Key *ret = NULL;
 117
 118         if ((r = sshkey_from_blob(blob, blen, &ret)) != 0) {
 119                 fatal_on_fatal_errors(r, __func__, 0);
 120                 error("%s: %s", __func__, ssh_err(r));
 121                 return NULL;
 122         }
 123         return ret;
 124 }
 125
 126 int
 127 key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
 128 {
 129         u_char *blob;
 130         size_t blen;
 131         int r;
 132
 133         if (blobp != NULL)
 134                 *blobp = NULL;
 135         if (lenp != NULL)
 136                 *lenp = 0;
 137         if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) {
 138                 fatal_on_fatal_errors(r, __func__, 0);
 139                 error("%s: %s", __func__, ssh_err(r));
 140                 return 0;
 141         }
 142         if (blen > INT_MAX)
 143                 fatal("%s: giant len %zu", __func__, blen);
 144         if (blobp != NULL)
 145                 *blobp = blob;
 146         if (lenp != NULL)
 147                 *lenp = blen;
 148         return blen;
 149 }
 150
 151 int
 152 key_sign(const Key *key, u_char **sigp, u_int *lenp,
 153     const u_char *data, u_int datalen)
 154 {
 155         int r;
 156         u_char *sig;
 157         size_t siglen;
 158
 159         if (sigp != NULL)
 160                 *sigp = NULL;
 161         if (lenp != NULL)
 162                 *lenp = 0;
 163         if ((r = sshkey_sign(key, &sig, &siglen,
 164             data, datalen, datafellows)) != 0) {
 165                 fatal_on_fatal_errors(r, __func__, 0);
 166                 error("%s: %s", __func__, ssh_err(r));
 167                 return -1;
 168         }
 169         if (siglen > INT_MAX)
 170                 fatal("%s: giant len %zu", __func__, siglen);
 171         if (sigp != NULL)
 172                 *sigp = sig;
 173         if (lenp != NULL)
 174                 *lenp = siglen;
 175         return 0;
 176 }
 177
 178 int
 179 key_verify(const Key *key, const u_char *signature, u_int signaturelen,
 180     const u_char *data, u_int datalen)
 181 {
 182         int r;
 183
 184         if ((r = sshkey_verify(key, signature, signaturelen,
 185             data, datalen, datafellows)) != 0) {
 186                 fatal_on_fatal_errors(r, __func__, 0);
 187                 error("%s: %s", __func__, ssh_err(r));
 188                 return r == SSH_ERR_SIGNATURE_INVALID ? 0 : -1;
 189         }
 190         return 1;
 191 }
 192
 193 Key *
 194 key_demote(const Key *k)
 195 {
 196         int r;
 197         Key *ret = NULL;
 198
 199         if ((r = sshkey_demote(k, &ret)) != 0)
 200                 fatal("%s: %s", __func__, ssh_err(r));
 201         return ret;
 202 }
 203
 204 int
 205 key_to_certified(Key *k, int legacy)
 206 {
 207         int r;
 208
 209         if ((r = sshkey_to_certified(k, legacy)) != 0) {
 210                 fatal_on_fatal_errors(r, __func__, 0);
 211                 error("%s: %s", __func__, ssh_err(r));
 212                 return -1;
 213         }
 214         return 0;
 215 }
 216
 217 int
 218 key_drop_cert(Key *k)
 219 {
 220         int r;
 221
 222         if ((r = sshkey_drop_cert(k)) != 0) {
 223                 fatal_on_fatal_errors(r, __func__, 0);
 224                 error("%s: %s", __func__, ssh_err(r));
 225                 return -1;
 226         }
 227         return 0;
 228 }
 229
 230 int
 231 key_certify(Key *k, Key *ca)
 232 {
 233         int r;
 234
 235         if ((r = sshkey_certify(k, ca)) != 0) {
 236                 fatal_on_fatal_errors(r, __func__, 0);
 237                 error("%s: %s", __func__, ssh_err(r));
 238                 return -1;
 239         }
 240         return 0;
 241 }
 242
 243 int
 244 key_cert_check_authority(const Key *k, int want_host, int require_principal,
 245     const char *name, const char **reason)
 246 {
 247         int r;
 248
 249         if ((r = sshkey_cert_check_authority(k, want_host, require_principal,
 250             name, reason)) != 0) {
 251                 fatal_on_fatal_errors(r, __func__, 0);
 252                 error("%s: %s", __func__, ssh_err(r));
 253                 return -1;
 254         }
 255         return 0;
 256 }
 257
 258 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
 259 int
 260 key_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
 261 {
 262         int r;
 263
 264         if ((r = sshkey_ec_validate_public(group, public)) != 0) {
 265                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 266                 error("%s: %s", __func__, ssh_err(r));
 267                 return -1;
 268         }
 269         return 0;
 270 }
 271
 272 int
 273 key_ec_validate_private(const EC_KEY *key)
 274 {
 275         int r;
 276
 277         if ((r = sshkey_ec_validate_private(key)) != 0) {
 278                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 279                 error("%s: %s", __func__, ssh_err(r));
 280                 return -1;
 281         }
 282         return 0;
 283 }
 284 #endif /* WITH_OPENSSL */
 285
 286 void
 287 key_private_serialize(const Key *key, struct sshbuf *b)
 288 {
 289         int r;
 290
 291         if ((r = sshkey_private_serialize(key, b)) != 0)
 292                 fatal("%s: %s", __func__, ssh_err(r));
 293 }
 294
 295 Key *
 296 key_private_deserialize(struct sshbuf *blob)
 297 {
 298         int r;
 299         Key *ret = NULL;
 300
 301         if ((r = sshkey_private_deserialize(blob, &ret)) != 0) {
 302                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 303                 error("%s: %s", __func__, ssh_err(r));
 304                 return NULL;
 305         }
 306         return ret;
 307 }
 308
 309 /* authfile.c */
 310
 311 int
 312 key_save_private(Key *key, const char *filename, const char *passphrase,
 313     const char *comment, int force_new_format, const char *new_format_cipher,
 314     int new_format_rounds)
 315 {
 316         int r;
 317
 318         if ((r = sshkey_save_private(key, filename, passphrase, comment,
 319             force_new_format, new_format_cipher, new_format_rounds)) != 0) {
 320                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 321                 error("%s: %s", __func__, ssh_err(r));
 322                 return 0;
 323         }
 324         return 1;
 325 }
 326
 327 int
 328 key_load_file(int fd, const char *filename, struct sshbuf *blob)
 329 {
 330         int r;
 331
 332         if ((r = sshkey_load_file(fd, filename, blob)) != 0) {
 333                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 334                 error("%s: %s", __func__, ssh_err(r));
 335                 return 0;
 336         }
 337         return 1;
 338 }
 339
 340 Key *
 341 key_load_cert(const char *filename)
 342 {
 343         int r;
 344         Key *ret = NULL;
 345
 346         if ((r = sshkey_load_cert(filename, &ret)) != 0) {
 347                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 348                 /* Old authfile.c ignored all file errors. */
 349                 if (r == SSH_ERR_SYSTEM_ERROR)
 350                         debug("%s: %s", __func__, ssh_err(r));
 351                 else
 352                         error("%s: %s", __func__, ssh_err(r));
 353                 return NULL;
 354         }
 355         return ret;
 356
 357 }
 358
 359 Key *
 360 key_load_public(const char *filename, char **commentp)
 361 {
 362         int r;
 363         Key *ret = NULL;
 364
 365         if ((r = sshkey_load_public(filename, &ret, commentp)) != 0) {
 366                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 367                 /* Old authfile.c ignored all file errors. */
 368                 if (r == SSH_ERR_SYSTEM_ERROR)
 369                         debug("%s: %s", __func__, ssh_err(r));
 370                 else
 371                         error("%s: %s", __func__, ssh_err(r));
 372                 return NULL;
 373         }
 374         return ret;
 375 }
 376
 377 Key *
 378 key_load_private(const char *path, const char *passphrase,
 379     char **commentp)
 380 {
 381         int r;
 382         Key *ret = NULL;
 383
 384         if ((r = sshkey_load_private(path, passphrase, &ret, commentp)) != 0) {
 385                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 386                 /* Old authfile.c ignored all file errors. */
 387                 if (r == SSH_ERR_SYSTEM_ERROR ||
 388                     r == SSH_ERR_KEY_WRONG_PASSPHRASE)
 389                         debug("%s: %s", __func__, ssh_err(r));
 390                 else
 391                         error("%s: %s", __func__, ssh_err(r));
 392                 return NULL;
 393         }
 394         return ret;
 395 }
 396
 397 Key *
 398 key_load_private_cert(int type, const char *filename, const char *passphrase,
 399     int *perm_ok)
 400 {
 401         int r;
 402         Key *ret = NULL;
 403
 404         if ((r = sshkey_load_private_cert(type, filename, passphrase,
 405             &ret, perm_ok)) != 0) {
 406                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 407                 /* Old authfile.c ignored all file errors. */
 408                 if (r == SSH_ERR_SYSTEM_ERROR ||
 409                     r == SSH_ERR_KEY_WRONG_PASSPHRASE)
 410                         debug("%s: %s", __func__, ssh_err(r));
 411                 else
 412                         error("%s: %s", __func__, ssh_err(r));
 413                 return NULL;
 414         }
 415         return ret;
 416 }
 417
 418 Key *
 419 key_load_private_type(int type, const char *filename, const char *passphrase,
 420     char **commentp, int *perm_ok)
 421 {
 422         int r;
 423         Key *ret = NULL;
 424
 425         if ((r = sshkey_load_private_type(type, filename, passphrase,
 426             &ret, commentp, perm_ok)) != 0) {
 427                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 428                 /* Old authfile.c ignored all file errors. */
 429                 if (r == SSH_ERR_SYSTEM_ERROR ||
 430                     (r == SSH_ERR_KEY_WRONG_PASSPHRASE))
 431                         debug("%s: %s", __func__, ssh_err(r));
 432                 else
 433                         error("%s: %s", __func__, ssh_err(r));
 434                 return NULL;
 435         }
 436         return ret;
 437 }
 438
 439 #ifdef WITH_OPENSSL
 440 Key *
 441 key_load_private_pem(int fd, int type, const char *passphrase,
 442     char **commentp)
 443 {
 444         int r;
 445         Key *ret = NULL;
 446
 447         if ((r = sshkey_load_private_pem(fd, type, passphrase,
 448              &ret, commentp)) != 0) {
 449                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 450                 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE)
 451                         debug("%s: %s", __func__, ssh_err(r));
 452                 else
 453                         error("%s: %s", __func__, ssh_err(r));
 454                 return NULL;
 455         }
 456         return ret;
 457 }
 458 #endif /* WITH_OPENSSL */
 459
 460 int
 461 key_perm_ok(int fd, const char *filename)
 462 {
 463         return sshkey_perm_ok(fd, filename) == 0 ? 1 : 0;
 464 }
 465
 466 int
 467 key_in_file(Key *key, const char *filename, int strict_type)
 468 {
 469         int r;
 470
 471         if ((r = sshkey_in_file(key, filename, strict_type)) != 0) {
 472                 fatal_on_fatal_errors(r, __func__, SSH_ERR_LIBCRYPTO_ERROR);
 473                 if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT)
 474                         return 0;
 475                 error("%s: %s", __func__, ssh_err(r));
 476                 return r == SSH_ERR_KEY_NOT_FOUND ? 0 : -1;
 477         }
 478         return 1;
 479 }