1 /* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Identity and host key generation and maintenance. 6 * 7 * As far as I am concerned, the code I have written for this software 8 * can be used freely for any purpose. Any derived versions of this 9 * software must be clearly marked as such, and if the derived work is 10 * incompatible with the protocol description in the RFC file, it must be 11 * called by a name other than "ssh" or "Secure Shell". 12 */ 13 14 #include "includes.h" 15 RCSID("$OpenBSD: ssh-keygen.c,v 1.94 2002/02/25 16:33:27 markus Exp $"); 16 17 #include <openssl/evp.h> 18 #include <openssl/pem.h> 19 20 #include "xmalloc.h" 21 #include "key.h" 22 #include "rsa.h" 23 #include "authfile.h" 24 #include "uuencode.h" 25 #include "buffer.h" 26 #include "bufaux.h" 27 #include "pathnames.h" 28 #include "log.h" 29 #include "readpass.h" 30 31 #ifdef SMARTCARD 32 #include <sectok.h> 33 #include <openssl/engine.h> 34 #include "scard.h" 35 #endif 36 37 /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ 38 int bits = 1024; 39 40 /* 41 * Flag indicating that we just want to change the passphrase. This can be 42 * set on the command line. 43 */ 44 int change_passphrase = 0; 45 46 /* 47 * Flag indicating that we just want to change the comment. This can be set 48 * on the command line. 49 */ 50 int change_comment = 0; 51 52 int quiet = 0; 53 54 /* Flag indicating that we just want to see the key fingerprint */ 55 int print_fingerprint = 0; 56 int print_bubblebabble = 0; 57 58 /* The identity file name, given on the command line or entered by the user. */ 59 char identity_file[1024]; 60 int have_identity = 0; 61 62 /* This is set to the passphrase if given on the command line. */ 63 char *identity_passphrase = NULL; 64 65 /* This is set to the new passphrase if given on the command line. */ 66 char *identity_new_passphrase = NULL; 67 68 /* This is set to the new comment if given on the command line. */ 69 char *identity_comment = NULL; 70 71 /* Dump public key file in format used by real and the original SSH 2 */ 72 int convert_to_ssh2 = 0; 73 int convert_from_ssh2 = 0; 74 int print_public = 0; 75 76 char *key_type_name = NULL; 77 78 /* argv0 */ 79 extern char *__progname; 80 81 char hostname[MAXHOSTNAMELEN]; 82 83 static void 84 ask_filename(struct passwd *pw, const char *prompt) 85 { 86 char buf[1024]; 87 char *name = NULL; 88 89 if (key_type_name == NULL) 90 name = _PATH_SSH_CLIENT_ID_RSA; 91 else 92 switch (key_type_from_name(key_type_name)) { 93 case KEY_RSA1: 94 name = _PATH_SSH_CLIENT_IDENTITY; 95 break; 96 case KEY_DSA: 97 name = _PATH_SSH_CLIENT_ID_DSA; 98 break; 99 case KEY_RSA: 100 name = _PATH_SSH_CLIENT_ID_RSA; 101 break; 102 default: 103 fprintf(stderr, "bad key type"); 104 exit(1); 105 break; 106 } 107 108 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 109 fprintf(stderr, "%s (%s): ", prompt, identity_file); 110 fflush(stderr); 111 if (fgets(buf, sizeof(buf), stdin) == NULL) 112 exit(1); 113 if (strchr(buf, '\n')) 114 *strchr(buf, '\n') = 0; 115 if (strcmp(buf, "") != 0) 116 strlcpy(identity_file, buf, sizeof(identity_file)); 117 have_identity = 1; 118 } 119 120 static Key * 121 load_identity(char *filename) 122 { 123 char *pass; 124 Key *prv; 125 126 prv = key_load_private(filename, "", NULL); 127 if (prv == NULL) { 128 if (identity_passphrase) 129 pass = xstrdup(identity_passphrase); 130 else 131 pass = read_passphrase("Enter passphrase: ", 132 RP_ALLOW_STDIN); 133 prv = key_load_private(filename, pass, NULL); 134 memset(pass, 0, strlen(pass)); 135 xfree(pass); 136 } 137 return prv; 138 } 139 140 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 141 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 142 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 143 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 144 145 static void 146 do_convert_to_ssh2(struct passwd *pw) 147 { 148 Key *k; 149 u_int len; 150 u_char *blob; 151 struct stat st; 152 153 if (!have_identity) 154 ask_filename(pw, "Enter file in which the key is"); 155 if (stat(identity_file, &st) < 0) { 156 perror(identity_file); 157 exit(1); 158 } 159 if ((k = key_load_public(identity_file, NULL)) == NULL) { 160 if ((k = load_identity(identity_file)) == NULL) { 161 fprintf(stderr, "load failed\n"); 162 exit(1); 163 } 164 } 165 if (key_to_blob(k, &blob, &len) <= 0) { 166 fprintf(stderr, "key_to_blob failed\n"); 167 exit(1); 168 } 169 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 170 fprintf(stdout, 171 "Comment: \"%d-bit %s, converted from OpenSSH by %s@%s\"\n", 172 key_size(k), key_type(k), 173 pw->pw_name, hostname); 174 dump_base64(stdout, blob, len); 175 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 176 key_free(k); 177 xfree(blob); 178 exit(0); 179 } 180 181 static void 182 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 183 { 184 int bits = buffer_get_int(b); 185 int bytes = (bits + 7) / 8; 186 187 if (buffer_len(b) < bytes) 188 fatal("buffer_get_bignum_bits: input buffer too small: " 189 "need %d have %d", bytes, buffer_len(b)); 190 BN_bin2bn(buffer_ptr(b), bytes, value); 191 buffer_consume(b, bytes); 192 } 193 194 static Key * 195 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 196 { 197 Buffer b; 198 Key *key = NULL; 199 char *type, *cipher; 200 u_char *sig, data[] = "abcde12345"; 201 int magic, rlen, ktype, i1, i2, i3, i4; 202 u_int slen; 203 u_long e; 204 205 buffer_init(&b); 206 buffer_append(&b, blob, blen); 207 208 magic = buffer_get_int(&b); 209 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 210 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 211 buffer_free(&b); 212 return NULL; 213 } 214 i1 = buffer_get_int(&b); 215 type = buffer_get_string(&b, NULL); 216 cipher = buffer_get_string(&b, NULL); 217 i2 = buffer_get_int(&b); 218 i3 = buffer_get_int(&b); 219 i4 = buffer_get_int(&b); 220 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 221 if (strcmp(cipher, "none") != 0) { 222 error("unsupported cipher %s", cipher); 223 xfree(cipher); 224 buffer_free(&b); 225 xfree(type); 226 return NULL; 227 } 228 xfree(cipher); 229 230 if (strstr(type, "dsa")) { 231 ktype = KEY_DSA; 232 } else if (strstr(type, "rsa")) { 233 ktype = KEY_RSA; 234 } else { 235 xfree(type); 236 return NULL; 237 } 238 key = key_new_private(ktype); 239 xfree(type); 240 241 switch (key->type) { 242 case KEY_DSA: 243 buffer_get_bignum_bits(&b, key->dsa->p); 244 buffer_get_bignum_bits(&b, key->dsa->g); 245 buffer_get_bignum_bits(&b, key->dsa->q); 246 buffer_get_bignum_bits(&b, key->dsa->pub_key); 247 buffer_get_bignum_bits(&b, key->dsa->priv_key); 248 break; 249 case KEY_RSA: 250 e = buffer_get_char(&b); 251 debug("e %lx", e); 252 if (e < 30) { 253 e <<= 8; 254 e += buffer_get_char(&b); 255 debug("e %lx", e); 256 e <<= 8; 257 e += buffer_get_char(&b); 258 debug("e %lx", e); 259 } 260 if (!BN_set_word(key->rsa->e, e)) { 261 buffer_free(&b); 262 key_free(key); 263 return NULL; 264 } 265 buffer_get_bignum_bits(&b, key->rsa->d); 266 buffer_get_bignum_bits(&b, key->rsa->n); 267 buffer_get_bignum_bits(&b, key->rsa->iqmp); 268 buffer_get_bignum_bits(&b, key->rsa->q); 269 buffer_get_bignum_bits(&b, key->rsa->p); 270 rsa_generate_additional_parameters(key->rsa); 271 break; 272 } 273 rlen = buffer_len(&b); 274 if (rlen != 0) 275 error("do_convert_private_ssh2_from_blob: " 276 "remaining bytes in key blob %d", rlen); 277 buffer_free(&b); 278 279 /* try the key */ 280 key_sign(key, &sig, &slen, data, sizeof(data)); 281 key_verify(key, sig, slen, data, sizeof(data)); 282 xfree(sig); 283 return key; 284 } 285 286 static void 287 do_convert_from_ssh2(struct passwd *pw) 288 { 289 Key *k; 290 int blen; 291 char line[1024], *p; 292 u_char blob[8096]; 293 char encoded[8096]; 294 struct stat st; 295 int escaped = 0, private = 0, ok; 296 FILE *fp; 297 298 if (!have_identity) 299 ask_filename(pw, "Enter file in which the key is"); 300 if (stat(identity_file, &st) < 0) { 301 perror(identity_file); 302 exit(1); 303 } 304 fp = fopen(identity_file, "r"); 305 if (fp == NULL) { 306 perror(identity_file); 307 exit(1); 308 } 309 encoded[0] = '\0'; 310 while (fgets(line, sizeof(line), fp)) { 311 if (!(p = strchr(line, '\n'))) { 312 fprintf(stderr, "input line too long.\n"); 313 exit(1); 314 } 315 if (p > line && p[-1] == '\\') 316 escaped++; 317 if (strncmp(line, "----", 4) == 0 || 318 strstr(line, ": ") != NULL) { 319 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 320 private = 1; 321 if (strstr(line, " END ") != NULL) { 322 break; 323 } 324 /* fprintf(stderr, "ignore: %s", line); */ 325 continue; 326 } 327 if (escaped) { 328 escaped--; 329 /* fprintf(stderr, "escaped: %s", line); */ 330 continue; 331 } 332 *p = '\0'; 333 strlcat(encoded, line, sizeof(encoded)); 334 } 335 blen = uudecode(encoded, blob, sizeof(blob)); 336 if (blen < 0) { 337 fprintf(stderr, "uudecode failed.\n"); 338 exit(1); 339 } 340 k = private ? 341 do_convert_private_ssh2_from_blob(blob, blen) : 342 key_from_blob(blob, blen); 343 if (k == NULL) { 344 fprintf(stderr, "decode blob failed.\n"); 345 exit(1); 346 } 347 ok = private ? 348 (k->type == KEY_DSA ? 349 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 350 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 351 key_write(k, stdout); 352 if (!ok) { 353 fprintf(stderr, "key write failed"); 354 exit(1); 355 } 356 key_free(k); 357 if (!private) 358 fprintf(stdout, "\n"); 359 fclose(fp); 360 exit(0); 361 } 362 363 static void 364 do_print_public(struct passwd *pw) 365 { 366 Key *prv; 367 struct stat st; 368 369 if (!have_identity) 370 ask_filename(pw, "Enter file in which the key is"); 371 if (stat(identity_file, &st) < 0) { 372 perror(identity_file); 373 exit(1); 374 } 375 prv = load_identity(identity_file); 376 if (prv == NULL) { 377 fprintf(stderr, "load failed\n"); 378 exit(1); 379 } 380 if (!key_write(prv, stdout)) 381 fprintf(stderr, "key_write failed"); 382 key_free(prv); 383 fprintf(stdout, "\n"); 384 exit(0); 385 } 386 387 #ifdef SMARTCARD 388 #define NUM_RSA_KEY_ELEMENTS 5+1 389 #define COPY_RSA_KEY(x, i) \ 390 do { \ 391 len = BN_num_bytes(prv->rsa->x); \ 392 elements[i] = xmalloc(len); \ 393 debug("#bytes %d", len); \ 394 if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \ 395 goto done; \ 396 } while (0) 397 398 static int 399 get_AUT0(char *aut0) 400 { 401 EVP_MD *evp_md = EVP_sha1(); 402 EVP_MD_CTX md; 403 char *pass; 404 405 pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 406 if (pass == NULL) 407 return -1; 408 EVP_DigestInit(&md, evp_md); 409 EVP_DigestUpdate(&md, pass, strlen(pass)); 410 EVP_DigestFinal(&md, aut0, NULL); 411 memset(pass, 0, strlen(pass)); 412 xfree(pass); 413 return 0; 414 } 415 416 static void 417 do_upload(struct passwd *pw, const char *sc_reader_id) 418 { 419 Key *prv = NULL; 420 struct stat st; 421 u_char *elements[NUM_RSA_KEY_ELEMENTS]; 422 u_char key_fid[2]; 423 u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63}; 424 u_char AUT0[EVP_MAX_MD_SIZE]; 425 int len, status = 1, i, fd = -1, ret; 426 int sw = 0, cla = 0x00; 427 428 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 429 elements[i] = NULL; 430 if (!have_identity) 431 ask_filename(pw, "Enter file in which the key is"); 432 if (stat(identity_file, &st) < 0) { 433 perror(identity_file); 434 goto done; 435 } 436 prv = load_identity(identity_file); 437 if (prv == NULL) { 438 error("load failed"); 439 goto done; 440 } 441 COPY_RSA_KEY(q, 0); 442 COPY_RSA_KEY(p, 1); 443 COPY_RSA_KEY(iqmp, 2); 444 COPY_RSA_KEY(dmq1, 3); 445 COPY_RSA_KEY(dmp1, 4); 446 COPY_RSA_KEY(n, 5); 447 len = BN_num_bytes(prv->rsa->n); 448 fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw); 449 if (fd < 0) { 450 error("sectok_open failed: %s", sectok_get_sw(sw)); 451 goto done; 452 } 453 if (! sectok_cardpresent(fd)) { 454 error("smartcard in reader %s not present", 455 sc_reader_id); 456 goto done; 457 } 458 ret = sectok_reset(fd, 0, NULL, &sw); 459 if (ret <= 0) { 460 error("sectok_reset failed: %s", sectok_get_sw(sw)); 461 goto done; 462 } 463 if ((cla = cyberflex_inq_class(fd)) < 0) { 464 error("cyberflex_inq_class failed"); 465 goto done; 466 } 467 memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0)); 468 if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 469 if (get_AUT0(AUT0) < 0 || 470 cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 471 error("cyberflex_verify_AUT0 failed"); 472 goto done; 473 } 474 } 475 key_fid[0] = 0x00; 476 key_fid[1] = 0x12; 477 if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements, 478 &sw) < 0) { 479 error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw)); 480 goto done; 481 } 482 if (!sectok_swOK(sw)) 483 goto done; 484 log("cyberflex_load_rsa_priv done"); 485 key_fid[0] = 0x73; 486 key_fid[1] = 0x68; 487 if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5], 488 &sw) < 0) { 489 error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw)); 490 goto done; 491 } 492 if (!sectok_swOK(sw)) 493 goto done; 494 log("cyberflex_load_rsa_pub done"); 495 status = 0; 496 log("loading key done"); 497 done: 498 499 memset(elements[0], '\0', BN_num_bytes(prv->rsa->q)); 500 memset(elements[1], '\0', BN_num_bytes(prv->rsa->p)); 501 memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp)); 502 memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1)); 503 memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1)); 504 memset(elements[5], '\0', BN_num_bytes(prv->rsa->n)); 505 506 if (prv) 507 key_free(prv); 508 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 509 if (elements[i]) 510 xfree(elements[i]); 511 if (fd != -1) 512 sectok_close(fd); 513 exit(status); 514 } 515 516 static void 517 do_download(struct passwd *pw, const char *sc_reader_id) 518 { 519 Key *pub = NULL; 520 521 pub = sc_get_key(sc_reader_id); 522 if (pub == NULL) 523 fatal("cannot read public key from smartcard"); 524 key_write(pub, stdout); 525 key_free(pub); 526 fprintf(stdout, "\n"); 527 exit(0); 528 } 529 #endif /* SMARTCARD */ 530 531 static void 532 do_fingerprint(struct passwd *pw) 533 { 534 FILE *f; 535 Key *public; 536 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 537 int i, skip = 0, num = 1, invalid = 1; 538 enum fp_rep rep; 539 enum fp_type fptype; 540 struct stat st; 541 542 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 543 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 544 545 if (!have_identity) 546 ask_filename(pw, "Enter file in which the key is"); 547 if (stat(identity_file, &st) < 0) { 548 perror(identity_file); 549 exit(1); 550 } 551 public = key_load_public(identity_file, &comment); 552 if (public != NULL) { 553 fp = key_fingerprint(public, fptype, rep); 554 printf("%d %s %s\n", key_size(public), fp, comment); 555 key_free(public); 556 xfree(comment); 557 xfree(fp); 558 exit(0); 559 } 560 if (comment) 561 xfree(comment); 562 563 f = fopen(identity_file, "r"); 564 if (f != NULL) { 565 while (fgets(line, sizeof(line), f)) { 566 i = strlen(line) - 1; 567 if (line[i] != '\n') { 568 error("line %d too long: %.40s...", num, line); 569 skip = 1; 570 continue; 571 } 572 num++; 573 if (skip) { 574 skip = 0; 575 continue; 576 } 577 line[i] = '\0'; 578 579 /* Skip leading whitespace, empty and comment lines. */ 580 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 581 ; 582 if (!*cp || *cp == '\n' || *cp == '#') 583 continue ; 584 i = strtol(cp, &ep, 10); 585 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 586 int quoted = 0; 587 comment = cp; 588 for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { 589 if (*cp == '\\' && cp[1] == '"') 590 cp++; /* Skip both */ 591 else if (*cp == '"') 592 quoted = !quoted; 593 } 594 if (!*cp) 595 continue; 596 *cp++ = '\0'; 597 } 598 ep = cp; 599 public = key_new(KEY_RSA1); 600 if (key_read(public, &cp) != 1) { 601 cp = ep; 602 key_free(public); 603 public = key_new(KEY_UNSPEC); 604 if (key_read(public, &cp) != 1) { 605 key_free(public); 606 continue; 607 } 608 } 609 comment = *cp ? cp : comment; 610 fp = key_fingerprint(public, fptype, rep); 611 printf("%d %s %s\n", key_size(public), fp, 612 comment ? comment : "no comment"); 613 xfree(fp); 614 key_free(public); 615 invalid = 0; 616 } 617 fclose(f); 618 } 619 if (invalid) { 620 printf("%s is not a public key file.\n", identity_file); 621 exit(1); 622 } 623 exit(0); 624 } 625 626 /* 627 * Perform changing a passphrase. The argument is the passwd structure 628 * for the current user. 629 */ 630 static void 631 do_change_passphrase(struct passwd *pw) 632 { 633 char *comment; 634 char *old_passphrase, *passphrase1, *passphrase2; 635 struct stat st; 636 Key *private; 637 638 if (!have_identity) 639 ask_filename(pw, "Enter file in which the key is"); 640 if (stat(identity_file, &st) < 0) { 641 perror(identity_file); 642 exit(1); 643 } 644 /* Try to load the file with empty passphrase. */ 645 private = key_load_private(identity_file, "", &comment); 646 if (private == NULL) { 647 if (identity_passphrase) 648 old_passphrase = xstrdup(identity_passphrase); 649 else 650 old_passphrase = 651 read_passphrase("Enter old passphrase: ", 652 RP_ALLOW_STDIN); 653 private = key_load_private(identity_file, old_passphrase, 654 &comment); 655 memset(old_passphrase, 0, strlen(old_passphrase)); 656 xfree(old_passphrase); 657 if (private == NULL) { 658 printf("Bad passphrase.\n"); 659 exit(1); 660 } 661 } 662 printf("Key has comment '%s'\n", comment); 663 664 /* Ask the new passphrase (twice). */ 665 if (identity_new_passphrase) { 666 passphrase1 = xstrdup(identity_new_passphrase); 667 passphrase2 = NULL; 668 } else { 669 passphrase1 = 670 read_passphrase("Enter new passphrase (empty for no " 671 "passphrase): ", RP_ALLOW_STDIN); 672 passphrase2 = read_passphrase("Enter same passphrase again: ", 673 RP_ALLOW_STDIN); 674 675 /* Verify that they are the same. */ 676 if (strcmp(passphrase1, passphrase2) != 0) { 677 memset(passphrase1, 0, strlen(passphrase1)); 678 memset(passphrase2, 0, strlen(passphrase2)); 679 xfree(passphrase1); 680 xfree(passphrase2); 681 printf("Pass phrases do not match. Try again.\n"); 682 exit(1); 683 } 684 /* Destroy the other copy. */ 685 memset(passphrase2, 0, strlen(passphrase2)); 686 xfree(passphrase2); 687 } 688 689 /* Save the file using the new passphrase. */ 690 if (!key_save_private(private, identity_file, passphrase1, comment)) { 691 printf("Saving the key failed: %s.\n", identity_file); 692 memset(passphrase1, 0, strlen(passphrase1)); 693 xfree(passphrase1); 694 key_free(private); 695 xfree(comment); 696 exit(1); 697 } 698 /* Destroy the passphrase and the copy of the key in memory. */ 699 memset(passphrase1, 0, strlen(passphrase1)); 700 xfree(passphrase1); 701 key_free(private); /* Destroys contents */ 702 xfree(comment); 703 704 printf("Your identification has been saved with the new passphrase.\n"); 705 exit(0); 706 } 707 708 /* 709 * Change the comment of a private key file. 710 */ 711 static void 712 do_change_comment(struct passwd *pw) 713 { 714 char new_comment[1024], *comment, *passphrase; 715 Key *private; 716 Key *public; 717 struct stat st; 718 FILE *f; 719 int fd; 720 721 if (!have_identity) 722 ask_filename(pw, "Enter file in which the key is"); 723 if (stat(identity_file, &st) < 0) { 724 perror(identity_file); 725 exit(1); 726 } 727 private = key_load_private(identity_file, "", &comment); 728 if (private == NULL) { 729 if (identity_passphrase) 730 passphrase = xstrdup(identity_passphrase); 731 else if (identity_new_passphrase) 732 passphrase = xstrdup(identity_new_passphrase); 733 else 734 passphrase = read_passphrase("Enter passphrase: ", 735 RP_ALLOW_STDIN); 736 /* Try to load using the passphrase. */ 737 private = key_load_private(identity_file, passphrase, &comment); 738 if (private == NULL) { 739 memset(passphrase, 0, strlen(passphrase)); 740 xfree(passphrase); 741 printf("Bad passphrase.\n"); 742 exit(1); 743 } 744 } else { 745 passphrase = xstrdup(""); 746 } 747 if (private->type != KEY_RSA1) { 748 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 749 key_free(private); 750 exit(1); 751 } 752 printf("Key now has comment '%s'\n", comment); 753 754 if (identity_comment) { 755 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 756 } else { 757 printf("Enter new comment: "); 758 fflush(stdout); 759 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 760 memset(passphrase, 0, strlen(passphrase)); 761 key_free(private); 762 exit(1); 763 } 764 if (strchr(new_comment, '\n')) 765 *strchr(new_comment, '\n') = 0; 766 } 767 768 /* Save the file using the new passphrase. */ 769 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 770 printf("Saving the key failed: %s.\n", identity_file); 771 memset(passphrase, 0, strlen(passphrase)); 772 xfree(passphrase); 773 key_free(private); 774 xfree(comment); 775 exit(1); 776 } 777 memset(passphrase, 0, strlen(passphrase)); 778 xfree(passphrase); 779 public = key_from_private(private); 780 key_free(private); 781 782 strlcat(identity_file, ".pub", sizeof(identity_file)); 783 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 784 if (fd == -1) { 785 printf("Could not save your public key in %s\n", identity_file); 786 exit(1); 787 } 788 f = fdopen(fd, "w"); 789 if (f == NULL) { 790 printf("fdopen %s failed", identity_file); 791 exit(1); 792 } 793 if (!key_write(public, f)) 794 fprintf(stderr, "write key failed"); 795 key_free(public); 796 fprintf(f, " %s\n", new_comment); 797 fclose(f); 798 799 xfree(comment); 800 801 printf("The comment in your key file has been changed.\n"); 802 exit(0); 803 } 804 805 static void 806 usage(void) 807 { 808 fprintf(stderr, "Usage: %s [options]\n", __progname); 809 fprintf(stderr, "Options:\n"); 810 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 811 fprintf(stderr, " -c Change comment in private and public key files.\n"); 812 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 813 fprintf(stderr, " -f filename Filename of the key file.\n"); 814 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 815 fprintf(stderr, " -l Show fingerprint of key file.\n"); 816 fprintf(stderr, " -p Change passphrase of private key file.\n"); 817 fprintf(stderr, " -q Quiet.\n"); 818 fprintf(stderr, " -y Read private key file and print public key.\n"); 819 fprintf(stderr, " -t type Specify type of key to create.\n"); 820 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 821 fprintf(stderr, " -C comment Provide new comment.\n"); 822 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 823 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 824 #ifdef SMARTCARD 825 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 826 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 827 #endif /* SMARTCARD */ 828 829 exit(1); 830 } 831 832 /* 833 * Main program for key management. 834 */ 835 int 836 main(int ac, char **av) 837 { 838 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 839 char *reader_id = NULL; 840 Key *private, *public; 841 struct passwd *pw; 842 struct stat st; 843 int opt, type, fd, download = 0; 844 FILE *f; 845 846 extern int optind; 847 extern char *optarg; 848 849 SSLeay_add_all_algorithms(); 850 851 /* we need this for the home * directory. */ 852 pw = getpwuid(getuid()); 853 if (!pw) { 854 printf("You don't exist, go away!\n"); 855 exit(1); 856 } 857 if (gethostname(hostname, sizeof(hostname)) < 0) { 858 perror("gethostname"); 859 exit(1); 860 } 861 862 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { 863 switch (opt) { 864 case 'b': 865 bits = atoi(optarg); 866 if (bits < 512 || bits > 32768) { 867 printf("Bits has bad value.\n"); 868 exit(1); 869 } 870 break; 871 case 'l': 872 print_fingerprint = 1; 873 break; 874 case 'B': 875 print_bubblebabble = 1; 876 break; 877 case 'p': 878 change_passphrase = 1; 879 break; 880 case 'c': 881 change_comment = 1; 882 break; 883 case 'f': 884 strlcpy(identity_file, optarg, sizeof(identity_file)); 885 have_identity = 1; 886 break; 887 case 'P': 888 identity_passphrase = optarg; 889 break; 890 case 'N': 891 identity_new_passphrase = optarg; 892 break; 893 case 'C': 894 identity_comment = optarg; 895 break; 896 case 'q': 897 quiet = 1; 898 break; 899 case 'R': 900 /* unused */ 901 exit(0); 902 break; 903 case 'e': 904 case 'x': 905 /* export key */ 906 convert_to_ssh2 = 1; 907 break; 908 case 'i': 909 case 'X': 910 /* import key */ 911 convert_from_ssh2 = 1; 912 break; 913 case 'y': 914 print_public = 1; 915 break; 916 case 'd': 917 key_type_name = "dsa"; 918 break; 919 case 't': 920 key_type_name = optarg; 921 break; 922 case 'D': 923 download = 1; 924 case 'U': 925 reader_id = optarg; 926 break; 927 case '?': 928 default: 929 usage(); 930 } 931 } 932 if (optind < ac) { 933 printf("Too many arguments.\n"); 934 usage(); 935 } 936 if (change_passphrase && change_comment) { 937 printf("Can only have one of -p and -c.\n"); 938 usage(); 939 } 940 if (print_fingerprint || print_bubblebabble) 941 do_fingerprint(pw); 942 if (change_passphrase) 943 do_change_passphrase(pw); 944 if (change_comment) 945 do_change_comment(pw); 946 if (convert_to_ssh2) 947 do_convert_to_ssh2(pw); 948 if (convert_from_ssh2) 949 do_convert_from_ssh2(pw); 950 if (print_public) 951 do_print_public(pw); 952 if (reader_id != NULL) { 953 #ifdef SMARTCARD 954 if (download) 955 do_download(pw, reader_id); 956 else 957 do_upload(pw, reader_id); 958 #else /* SMARTCARD */ 959 fatal("no support for smartcards."); 960 #endif /* SMARTCARD */ 961 } 962 963 arc4random_stir(); 964 965 if (key_type_name == NULL) { 966 printf("You must specify a key type (-t).\n"); 967 usage(); 968 } 969 type = key_type_from_name(key_type_name); 970 if (type == KEY_UNSPEC) { 971 fprintf(stderr, "unknown key type %s\n", key_type_name); 972 exit(1); 973 } 974 if (!quiet) 975 printf("Generating public/private %s key pair.\n", key_type_name); 976 private = key_generate(type, bits); 977 if (private == NULL) { 978 fprintf(stderr, "key_generate failed"); 979 exit(1); 980 } 981 public = key_from_private(private); 982 983 if (!have_identity) 984 ask_filename(pw, "Enter file in which to save the key"); 985 986 /* Create ~/.ssh directory if it doesn\'t already exist. */ 987 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 988 if (strstr(identity_file, dotsshdir) != NULL && 989 stat(dotsshdir, &st) < 0) { 990 if (mkdir(dotsshdir, 0700) < 0) 991 error("Could not create directory '%s'.", dotsshdir); 992 else if (!quiet) 993 printf("Created directory '%s'.\n", dotsshdir); 994 } 995 /* If the file already exists, ask the user to confirm. */ 996 if (stat(identity_file, &st) >= 0) { 997 char yesno[3]; 998 printf("%s already exists.\n", identity_file); 999 printf("Overwrite (y/n)? "); 1000 fflush(stdout); 1001 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 1002 exit(1); 1003 if (yesno[0] != 'y' && yesno[0] != 'Y') 1004 exit(1); 1005 } 1006 /* Ask for a passphrase (twice). */ 1007 if (identity_passphrase) 1008 passphrase1 = xstrdup(identity_passphrase); 1009 else if (identity_new_passphrase) 1010 passphrase1 = xstrdup(identity_new_passphrase); 1011 else { 1012 passphrase_again: 1013 passphrase1 = 1014 read_passphrase("Enter passphrase (empty for no " 1015 "passphrase): ", RP_ALLOW_STDIN); 1016 passphrase2 = read_passphrase("Enter same passphrase again: ", 1017 RP_ALLOW_STDIN); 1018 if (strcmp(passphrase1, passphrase2) != 0) { 1019 /* 1020 * The passphrases do not match. Clear them and 1021 * retry. 1022 */ 1023 memset(passphrase1, 0, strlen(passphrase1)); 1024 memset(passphrase2, 0, strlen(passphrase2)); 1025 xfree(passphrase1); 1026 xfree(passphrase2); 1027 printf("Passphrases do not match. Try again.\n"); 1028 goto passphrase_again; 1029 } 1030 /* Clear the other copy of the passphrase. */ 1031 memset(passphrase2, 0, strlen(passphrase2)); 1032 xfree(passphrase2); 1033 } 1034 1035 if (identity_comment) { 1036 strlcpy(comment, identity_comment, sizeof(comment)); 1037 } else { 1038 /* Create default commend field for the passphrase. */ 1039 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1040 } 1041 1042 /* Save the key with the given passphrase and comment. */ 1043 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1044 printf("Saving the key failed: %s.\n", identity_file); 1045 memset(passphrase1, 0, strlen(passphrase1)); 1046 xfree(passphrase1); 1047 exit(1); 1048 } 1049 /* Clear the passphrase. */ 1050 memset(passphrase1, 0, strlen(passphrase1)); 1051 xfree(passphrase1); 1052 1053 /* Clear the private key and the random number generator. */ 1054 key_free(private); 1055 arc4random_stir(); 1056 1057 if (!quiet) 1058 printf("Your identification has been saved in %s.\n", identity_file); 1059 1060 strlcat(identity_file, ".pub", sizeof(identity_file)); 1061 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1062 if (fd == -1) { 1063 printf("Could not save your public key in %s\n", identity_file); 1064 exit(1); 1065 } 1066 f = fdopen(fd, "w"); 1067 if (f == NULL) { 1068 printf("fdopen %s failed", identity_file); 1069 exit(1); 1070 } 1071 if (!key_write(public, f)) 1072 fprintf(stderr, "write key failed"); 1073 fprintf(f, " %s\n", comment); 1074 fclose(f); 1075 1076 if (!quiet) { 1077 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1078 printf("Your public key has been saved in %s.\n", 1079 identity_file); 1080 printf("The key fingerprint is:\n"); 1081 printf("%s %s\n", fp, comment); 1082 xfree(fp); 1083 } 1084 1085 key_free(public); 1086 exit(0); 1087 } 1088