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 1.79 2001/08/02 16:14:05 jakob 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 /* default to RSA for SSH-1 */ 77 char *key_type_name = "rsa1"; 78 79 /* argv0 */ 80 extern char *__progname; 81 82 char hostname[MAXHOSTNAMELEN]; 83 84 static void 85 ask_filename(struct passwd *pw, const char *prompt) 86 { 87 char buf[1024]; 88 char *name = NULL; 89 90 switch (key_type_from_name(key_type_name)) { 91 case KEY_RSA1: 92 name = _PATH_SSH_CLIENT_IDENTITY; 93 break; 94 case KEY_DSA: 95 name = _PATH_SSH_CLIENT_ID_DSA; 96 break; 97 case KEY_RSA: 98 name = _PATH_SSH_CLIENT_ID_RSA; 99 break; 100 default: 101 fprintf(stderr, "bad key type"); 102 exit(1); 103 break; 104 } 105 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 106 fprintf(stderr, "%s (%s): ", prompt, identity_file); 107 fflush(stderr); 108 if (fgets(buf, sizeof(buf), stdin) == NULL) 109 exit(1); 110 if (strchr(buf, '\n')) 111 *strchr(buf, '\n') = 0; 112 if (strcmp(buf, "") != 0) 113 strlcpy(identity_file, buf, sizeof(identity_file)); 114 have_identity = 1; 115 } 116 117 static Key * 118 load_identity(char *filename) 119 { 120 char *pass; 121 Key *prv; 122 123 prv = key_load_private(filename, "", NULL); 124 if (prv == NULL) { 125 if (identity_passphrase) 126 pass = xstrdup(identity_passphrase); 127 else 128 pass = read_passphrase("Enter passphrase: ", 129 RP_ALLOW_STDIN); 130 prv = key_load_private(filename, pass, NULL); 131 memset(pass, 0, strlen(pass)); 132 xfree(pass); 133 } 134 return prv; 135 } 136 137 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 138 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 139 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 140 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 141 142 static void 143 do_convert_to_ssh2(struct passwd *pw) 144 { 145 Key *k; 146 int len; 147 u_char *blob; 148 struct stat st; 149 150 if (!have_identity) 151 ask_filename(pw, "Enter file in which the key is"); 152 if (stat(identity_file, &st) < 0) { 153 perror(identity_file); 154 exit(1); 155 } 156 if ((k = key_load_public(identity_file, NULL)) == NULL) { 157 if ((k = load_identity(identity_file)) == NULL) { 158 fprintf(stderr, "load failed\n"); 159 exit(1); 160 } 161 } 162 key_to_blob(k, &blob, &len); 163 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 164 fprintf(stdout, 165 "Comment: \"%d-bit %s, converted from OpenSSH by %s@%s\"\n", 166 key_size(k), key_type(k), 167 pw->pw_name, hostname); 168 dump_base64(stdout, blob, len); 169 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 170 key_free(k); 171 xfree(blob); 172 exit(0); 173 } 174 175 static void 176 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 177 { 178 int bits = buffer_get_int(b); 179 int bytes = (bits + 7) / 8; 180 181 if (buffer_len(b) < bytes) 182 fatal("buffer_get_bignum_bits: input buffer too small: " 183 "need %d have %d", bytes, buffer_len(b)); 184 BN_bin2bn((u_char *)buffer_ptr(b), bytes, value); 185 buffer_consume(b, bytes); 186 } 187 188 static Key * 189 do_convert_private_ssh2_from_blob(char *blob, int blen) 190 { 191 Buffer b; 192 Key *key = NULL; 193 char *type, *cipher; 194 u_char *sig, data[] = "abcde12345"; 195 int magic, rlen, ktype, i1, i2, i3, i4; 196 u_int slen; 197 u_long e; 198 199 buffer_init(&b); 200 buffer_append(&b, blob, blen); 201 202 magic = buffer_get_int(&b); 203 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 204 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 205 buffer_free(&b); 206 return NULL; 207 } 208 i1 = buffer_get_int(&b); 209 type = buffer_get_string(&b, NULL); 210 cipher = buffer_get_string(&b, NULL); 211 i2 = buffer_get_int(&b); 212 i3 = buffer_get_int(&b); 213 i4 = buffer_get_int(&b); 214 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 215 if (strcmp(cipher, "none") != 0) { 216 error("unsupported cipher %s", cipher); 217 xfree(cipher); 218 buffer_free(&b); 219 xfree(type); 220 return NULL; 221 } 222 xfree(cipher); 223 224 if (strstr(type, "dsa")) { 225 ktype = KEY_DSA; 226 } else if (strstr(type, "rsa")) { 227 ktype = KEY_RSA; 228 } else { 229 xfree(type); 230 return NULL; 231 } 232 key = key_new_private(ktype); 233 xfree(type); 234 235 switch (key->type) { 236 case KEY_DSA: 237 buffer_get_bignum_bits(&b, key->dsa->p); 238 buffer_get_bignum_bits(&b, key->dsa->g); 239 buffer_get_bignum_bits(&b, key->dsa->q); 240 buffer_get_bignum_bits(&b, key->dsa->pub_key); 241 buffer_get_bignum_bits(&b, key->dsa->priv_key); 242 break; 243 case KEY_RSA: 244 e = buffer_get_char(&b); 245 debug("e %lx", e); 246 if (e < 30) { 247 e <<= 8; 248 e += buffer_get_char(&b); 249 debug("e %lx", e); 250 e <<= 8; 251 e += buffer_get_char(&b); 252 debug("e %lx", e); 253 } 254 if (!BN_set_word(key->rsa->e, e)) { 255 buffer_free(&b); 256 key_free(key); 257 return NULL; 258 } 259 buffer_get_bignum_bits(&b, key->rsa->d); 260 buffer_get_bignum_bits(&b, key->rsa->n); 261 buffer_get_bignum_bits(&b, key->rsa->iqmp); 262 buffer_get_bignum_bits(&b, key->rsa->q); 263 buffer_get_bignum_bits(&b, key->rsa->p); 264 rsa_generate_additional_parameters(key->rsa); 265 break; 266 } 267 rlen = buffer_len(&b); 268 if(rlen != 0) 269 error("do_convert_private_ssh2_from_blob: " 270 "remaining bytes in key blob %d", rlen); 271 buffer_free(&b); 272 273 /* try the key */ 274 key_sign(key, &sig, &slen, data, sizeof(data)); 275 key_verify(key, sig, slen, data, sizeof(data)); 276 xfree(sig); 277 return key; 278 } 279 280 static void 281 do_convert_from_ssh2(struct passwd *pw) 282 { 283 Key *k; 284 int blen; 285 char line[1024], *p; 286 char blob[8096]; 287 char encoded[8096]; 288 struct stat st; 289 int escaped = 0, private = 0, ok; 290 FILE *fp; 291 292 if (!have_identity) 293 ask_filename(pw, "Enter file in which the key is"); 294 if (stat(identity_file, &st) < 0) { 295 perror(identity_file); 296 exit(1); 297 } 298 fp = fopen(identity_file, "r"); 299 if (fp == NULL) { 300 perror(identity_file); 301 exit(1); 302 } 303 encoded[0] = '\0'; 304 while (fgets(line, sizeof(line), fp)) { 305 if (!(p = strchr(line, '\n'))) { 306 fprintf(stderr, "input line too long.\n"); 307 exit(1); 308 } 309 if (p > line && p[-1] == '\\') 310 escaped++; 311 if (strncmp(line, "----", 4) == 0 || 312 strstr(line, ": ") != NULL) { 313 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 314 private = 1; 315 if (strstr(line, " END ") != NULL) { 316 break; 317 } 318 /* fprintf(stderr, "ignore: %s", line); */ 319 continue; 320 } 321 if (escaped) { 322 escaped--; 323 /* fprintf(stderr, "escaped: %s", line); */ 324 continue; 325 } 326 *p = '\0'; 327 strlcat(encoded, line, sizeof(encoded)); 328 } 329 blen = uudecode(encoded, (u_char *)blob, sizeof(blob)); 330 if (blen < 0) { 331 fprintf(stderr, "uudecode failed.\n"); 332 exit(1); 333 } 334 k = private ? 335 do_convert_private_ssh2_from_blob(blob, blen) : 336 key_from_blob(blob, blen); 337 if (k == NULL) { 338 fprintf(stderr, "decode blob failed.\n"); 339 exit(1); 340 } 341 ok = private ? 342 (k->type == KEY_DSA ? 343 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 344 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 345 key_write(k, stdout); 346 if (!ok) { 347 fprintf(stderr, "key write failed"); 348 exit(1); 349 } 350 key_free(k); 351 fprintf(stdout, "\n"); 352 fclose(fp); 353 exit(0); 354 } 355 356 static void 357 do_print_public(struct passwd *pw) 358 { 359 Key *prv; 360 struct stat st; 361 362 if (!have_identity) 363 ask_filename(pw, "Enter file in which the key is"); 364 if (stat(identity_file, &st) < 0) { 365 perror(identity_file); 366 exit(1); 367 } 368 prv = load_identity(identity_file); 369 if (prv == NULL) { 370 fprintf(stderr, "load failed\n"); 371 exit(1); 372 } 373 if (!key_write(prv, stdout)) 374 fprintf(stderr, "key_write failed"); 375 key_free(prv); 376 fprintf(stdout, "\n"); 377 exit(0); 378 } 379 380 #ifdef SMARTCARD 381 #define NUM_RSA_KEY_ELEMENTS 5+1 382 #define COPY_RSA_KEY(x, i) \ 383 do { \ 384 len = BN_num_bytes(prv->rsa->x); \ 385 elements[i] = xmalloc(len); \ 386 debug("#bytes %d", len); \ 387 if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \ 388 goto done; \ 389 } while(0) 390 391 static int 392 get_AUT0(char *aut0) 393 { 394 EVP_MD *evp_md = EVP_sha1(); 395 EVP_MD_CTX md; 396 char *pass; 397 398 pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 399 if (pass == NULL) 400 return -1; 401 EVP_DigestInit(&md, evp_md); 402 EVP_DigestUpdate(&md, pass, strlen(pass)); 403 EVP_DigestFinal(&md, aut0, NULL); 404 memset(pass, 0, strlen(pass)); 405 xfree(pass); 406 return 0; 407 } 408 409 static void 410 do_upload(struct passwd *pw, const char *sc_reader_id) 411 { 412 Key *prv = NULL; 413 struct stat st; 414 u_char *elements[NUM_RSA_KEY_ELEMENTS]; 415 u_char key_fid[2]; 416 u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63}; 417 u_char AUT0[EVP_MAX_MD_SIZE]; 418 int len, status = 1, i, fd = -1, ret; 419 int sw = 0, cla = 0x00; 420 421 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 422 elements[i] = NULL; 423 if (!have_identity) 424 ask_filename(pw, "Enter file in which the key is"); 425 if (stat(identity_file, &st) < 0) { 426 perror(identity_file); 427 goto done; 428 } 429 prv = load_identity(identity_file); 430 if (prv == NULL) { 431 error("load failed"); 432 goto done; 433 } 434 COPY_RSA_KEY(q, 0); 435 COPY_RSA_KEY(p, 1); 436 COPY_RSA_KEY(iqmp, 2); 437 COPY_RSA_KEY(dmq1, 3); 438 COPY_RSA_KEY(dmp1, 4); 439 COPY_RSA_KEY(n, 5); 440 len = BN_num_bytes(prv->rsa->n); 441 fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw); 442 if (fd < 0) { 443 error("sectok_open failed: %s", sectok_get_sw(sw)); 444 goto done; 445 } 446 if (! sectok_cardpresent(fd)) { 447 error("smartcard in reader %s not present", 448 sc_reader_id); 449 goto done; 450 } 451 ret = sectok_reset(fd, 0, NULL, &sw); 452 if (ret <= 0) { 453 error("sectok_reset failed: %s", sectok_get_sw(sw)); 454 goto done; 455 } 456 if ((cla = cyberflex_inq_class(fd)) < 0) { 457 error("cyberflex_inq_class failed"); 458 goto done; 459 } 460 memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0)); 461 if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 462 if (get_AUT0(AUT0) < 0 || 463 cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 464 error("cyberflex_verify_AUT0 failed"); 465 goto done; 466 } 467 } 468 key_fid[0] = 0x00; 469 key_fid[1] = 0x12; 470 if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements, 471 &sw) < 0) { 472 error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw)); 473 goto done; 474 } 475 if (!sectok_swOK(sw)) 476 goto done; 477 log("cyberflex_load_rsa_priv done"); 478 key_fid[0] = 0x73; 479 key_fid[1] = 0x68; 480 if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5], 481 &sw) < 0) { 482 error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw)); 483 goto done; 484 } 485 if (!sectok_swOK(sw)) 486 goto done; 487 log("cyberflex_load_rsa_pub done"); 488 status = 0; 489 log("loading key done"); 490 done: 491 if (prv) 492 key_free(prv); 493 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 494 if (elements[i]) 495 xfree(elements[i]); 496 if (fd != -1) 497 sectok_close(fd); 498 exit(status); 499 } 500 501 static void 502 do_download(struct passwd *pw, const char *sc_reader_id) 503 { 504 Key *pub = NULL; 505 506 pub = sc_get_key(sc_reader_id); 507 if (pub == NULL) 508 fatal("cannot read public key from smartcard"); 509 key_write(pub, stdout); 510 key_free(pub); 511 fprintf(stdout, "\n"); 512 exit(0); 513 } 514 #endif /* SMARTCARD */ 515 516 static void 517 do_fingerprint(struct passwd *pw) 518 { 519 FILE *f; 520 Key *public; 521 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 522 int i, skip = 0, num = 1, invalid = 1, rep, fptype; 523 struct stat st; 524 525 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 526 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 527 528 if (!have_identity) 529 ask_filename(pw, "Enter file in which the key is"); 530 if (stat(identity_file, &st) < 0) { 531 perror(identity_file); 532 exit(1); 533 } 534 public = key_load_public(identity_file, &comment); 535 if (public != NULL) { 536 fp = key_fingerprint(public, fptype, rep); 537 printf("%d %s %s\n", key_size(public), fp, comment); 538 key_free(public); 539 xfree(comment); 540 xfree(fp); 541 exit(0); 542 } 543 if (comment) 544 xfree(comment); 545 546 f = fopen(identity_file, "r"); 547 if (f != NULL) { 548 while (fgets(line, sizeof(line), f)) { 549 i = strlen(line) - 1; 550 if (line[i] != '\n') { 551 error("line %d too long: %.40s...", num, line); 552 skip = 1; 553 continue; 554 } 555 num++; 556 if (skip) { 557 skip = 0; 558 continue; 559 } 560 line[i] = '\0'; 561 562 /* Skip leading whitespace, empty and comment lines. */ 563 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 564 ; 565 if (!*cp || *cp == '\n' || *cp == '#') 566 continue ; 567 i = strtol(cp, &ep, 10); 568 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 569 int quoted = 0; 570 comment = cp; 571 for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { 572 if (*cp == '\\' && cp[1] == '"') 573 cp++; /* Skip both */ 574 else if (*cp == '"') 575 quoted = !quoted; 576 } 577 if (!*cp) 578 continue; 579 *cp++ = '\0'; 580 } 581 ep = cp; 582 public = key_new(KEY_RSA1); 583 if (key_read(public, &cp) != 1) { 584 cp = ep; 585 key_free(public); 586 public = key_new(KEY_UNSPEC); 587 if (key_read(public, &cp) != 1) { 588 key_free(public); 589 continue; 590 } 591 } 592 comment = *cp ? cp : comment; 593 fp = key_fingerprint(public, fptype, rep); 594 printf("%d %s %s\n", key_size(public), fp, 595 comment ? comment : "no comment"); 596 xfree(fp); 597 key_free(public); 598 invalid = 0; 599 } 600 fclose(f); 601 } 602 if (invalid) { 603 printf("%s is not a valid key file.\n", identity_file); 604 exit(1); 605 } 606 exit(0); 607 } 608 609 /* 610 * Perform changing a passphrase. The argument is the passwd structure 611 * for the current user. 612 */ 613 static void 614 do_change_passphrase(struct passwd *pw) 615 { 616 char *comment; 617 char *old_passphrase, *passphrase1, *passphrase2; 618 struct stat st; 619 Key *private; 620 621 if (!have_identity) 622 ask_filename(pw, "Enter file in which the key is"); 623 if (stat(identity_file, &st) < 0) { 624 perror(identity_file); 625 exit(1); 626 } 627 /* Try to load the file with empty passphrase. */ 628 private = key_load_private(identity_file, "", &comment); 629 if (private == NULL) { 630 if (identity_passphrase) 631 old_passphrase = xstrdup(identity_passphrase); 632 else 633 old_passphrase = 634 read_passphrase("Enter old passphrase: ", 635 RP_ALLOW_STDIN); 636 private = key_load_private(identity_file, old_passphrase, 637 &comment); 638 memset(old_passphrase, 0, strlen(old_passphrase)); 639 xfree(old_passphrase); 640 if (private == NULL) { 641 printf("Bad passphrase.\n"); 642 exit(1); 643 } 644 } 645 printf("Key has comment '%s'\n", comment); 646 647 /* Ask the new passphrase (twice). */ 648 if (identity_new_passphrase) { 649 passphrase1 = xstrdup(identity_new_passphrase); 650 passphrase2 = NULL; 651 } else { 652 passphrase1 = 653 read_passphrase("Enter new passphrase (empty for no " 654 "passphrase): ", RP_ALLOW_STDIN); 655 passphrase2 = read_passphrase("Enter same passphrase again: ", 656 RP_ALLOW_STDIN); 657 658 /* Verify that they are the same. */ 659 if (strcmp(passphrase1, passphrase2) != 0) { 660 memset(passphrase1, 0, strlen(passphrase1)); 661 memset(passphrase2, 0, strlen(passphrase2)); 662 xfree(passphrase1); 663 xfree(passphrase2); 664 printf("Pass phrases do not match. Try again.\n"); 665 exit(1); 666 } 667 /* Destroy the other copy. */ 668 memset(passphrase2, 0, strlen(passphrase2)); 669 xfree(passphrase2); 670 } 671 672 /* Save the file using the new passphrase. */ 673 if (!key_save_private(private, identity_file, passphrase1, comment)) { 674 printf("Saving the key failed: %s.\n", identity_file); 675 memset(passphrase1, 0, strlen(passphrase1)); 676 xfree(passphrase1); 677 key_free(private); 678 xfree(comment); 679 exit(1); 680 } 681 /* Destroy the passphrase and the copy of the key in memory. */ 682 memset(passphrase1, 0, strlen(passphrase1)); 683 xfree(passphrase1); 684 key_free(private); /* Destroys contents */ 685 xfree(comment); 686 687 printf("Your identification has been saved with the new passphrase.\n"); 688 exit(0); 689 } 690 691 /* 692 * Change the comment of a private key file. 693 */ 694 static void 695 do_change_comment(struct passwd *pw) 696 { 697 char new_comment[1024], *comment, *passphrase; 698 Key *private; 699 Key *public; 700 struct stat st; 701 FILE *f; 702 int fd; 703 704 if (!have_identity) 705 ask_filename(pw, "Enter file in which the key is"); 706 if (stat(identity_file, &st) < 0) { 707 perror(identity_file); 708 exit(1); 709 } 710 private = key_load_private(identity_file, "", &comment); 711 if (private == NULL) { 712 if (identity_passphrase) 713 passphrase = xstrdup(identity_passphrase); 714 else if (identity_new_passphrase) 715 passphrase = xstrdup(identity_new_passphrase); 716 else 717 passphrase = read_passphrase("Enter passphrase: ", 718 RP_ALLOW_STDIN); 719 /* Try to load using the passphrase. */ 720 private = key_load_private(identity_file, passphrase, &comment); 721 if (private == NULL) { 722 memset(passphrase, 0, strlen(passphrase)); 723 xfree(passphrase); 724 printf("Bad passphrase.\n"); 725 exit(1); 726 } 727 } else { 728 passphrase = xstrdup(""); 729 } 730 if (private->type != KEY_RSA1) { 731 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 732 key_free(private); 733 exit(1); 734 } 735 printf("Key now has comment '%s'\n", comment); 736 737 if (identity_comment) { 738 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 739 } else { 740 printf("Enter new comment: "); 741 fflush(stdout); 742 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 743 memset(passphrase, 0, strlen(passphrase)); 744 key_free(private); 745 exit(1); 746 } 747 if (strchr(new_comment, '\n')) 748 *strchr(new_comment, '\n') = 0; 749 } 750 751 /* Save the file using the new passphrase. */ 752 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 753 printf("Saving the key failed: %s.\n", identity_file); 754 memset(passphrase, 0, strlen(passphrase)); 755 xfree(passphrase); 756 key_free(private); 757 xfree(comment); 758 exit(1); 759 } 760 memset(passphrase, 0, strlen(passphrase)); 761 xfree(passphrase); 762 public = key_from_private(private); 763 key_free(private); 764 765 strlcat(identity_file, ".pub", sizeof(identity_file)); 766 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 767 if (fd == -1) { 768 printf("Could not save your public key in %s\n", identity_file); 769 exit(1); 770 } 771 f = fdopen(fd, "w"); 772 if (f == NULL) { 773 printf("fdopen %s failed", identity_file); 774 exit(1); 775 } 776 if (!key_write(public, f)) 777 fprintf(stderr, "write key failed"); 778 key_free(public); 779 fprintf(f, " %s\n", new_comment); 780 fclose(f); 781 782 xfree(comment); 783 784 printf("The comment in your key file has been changed.\n"); 785 exit(0); 786 } 787 788 static void 789 usage(void) 790 { 791 fprintf(stderr, "Usage: %s [options]\n", __progname); 792 fprintf(stderr, "Options:\n"); 793 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 794 fprintf(stderr, " -c Change comment in private and public key files.\n"); 795 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 796 fprintf(stderr, " -f filename Filename of the key file.\n"); 797 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 798 fprintf(stderr, " -l Show fingerprint of key file.\n"); 799 fprintf(stderr, " -p Change passphrase of private key file.\n"); 800 fprintf(stderr, " -q Quiet.\n"); 801 fprintf(stderr, " -y Read private key file and print public key.\n"); 802 fprintf(stderr, " -t type Specify type of key to create.\n"); 803 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 804 fprintf(stderr, " -C comment Provide new comment.\n"); 805 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 806 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 807 #ifdef SMARTCARD 808 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 809 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 810 #endif /* SMARTCARD */ 811 812 exit(1); 813 } 814 815 /* 816 * Main program for key management. 817 */ 818 int 819 main(int ac, char **av) 820 { 821 char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2; 822 char *reader_id = NULL; 823 Key *private, *public; 824 struct passwd *pw; 825 struct stat st; 826 int opt, type, fd, download = 0; 827 FILE *f; 828 829 extern int optind; 830 extern char *optarg; 831 832 SSLeay_add_all_algorithms(); 833 834 /* we need this for the home * directory. */ 835 pw = getpwuid(getuid()); 836 if (!pw) { 837 printf("You don't exist, go away!\n"); 838 exit(1); 839 } 840 if (gethostname(hostname, sizeof(hostname)) < 0) { 841 perror("gethostname"); 842 exit(1); 843 } 844 845 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { 846 switch (opt) { 847 case 'b': 848 bits = atoi(optarg); 849 if (bits < 512 || bits > 32768) { 850 printf("Bits has bad value.\n"); 851 exit(1); 852 } 853 break; 854 case 'l': 855 print_fingerprint = 1; 856 break; 857 case 'B': 858 print_bubblebabble = 1; 859 break; 860 case 'p': 861 change_passphrase = 1; 862 break; 863 case 'c': 864 change_comment = 1; 865 break; 866 case 'f': 867 strlcpy(identity_file, optarg, sizeof(identity_file)); 868 have_identity = 1; 869 break; 870 case 'P': 871 identity_passphrase = optarg; 872 break; 873 case 'N': 874 identity_new_passphrase = optarg; 875 break; 876 case 'C': 877 identity_comment = optarg; 878 break; 879 case 'q': 880 quiet = 1; 881 break; 882 case 'R': 883 /* unused */ 884 exit(0); 885 break; 886 case 'e': 887 case 'x': 888 /* export key */ 889 convert_to_ssh2 = 1; 890 break; 891 case 'i': 892 case 'X': 893 /* import key */ 894 convert_from_ssh2 = 1; 895 break; 896 case 'y': 897 print_public = 1; 898 break; 899 case 'd': 900 key_type_name = "dsa"; 901 break; 902 case 't': 903 key_type_name = optarg; 904 break; 905 case 'D': 906 download = 1; 907 case 'U': 908 reader_id = optarg; 909 break; 910 case '?': 911 default: 912 usage(); 913 } 914 } 915 if (optind < ac) { 916 printf("Too many arguments.\n"); 917 usage(); 918 } 919 if (change_passphrase && change_comment) { 920 printf("Can only have one of -p and -c.\n"); 921 usage(); 922 } 923 if (print_fingerprint || print_bubblebabble) 924 do_fingerprint(pw); 925 if (change_passphrase) 926 do_change_passphrase(pw); 927 if (change_comment) 928 do_change_comment(pw); 929 if (convert_to_ssh2) 930 do_convert_to_ssh2(pw); 931 if (convert_from_ssh2) 932 do_convert_from_ssh2(pw); 933 if (print_public) 934 do_print_public(pw); 935 if (reader_id != NULL) { 936 #ifdef SMARTCARD 937 if (download) 938 do_download(pw, reader_id); 939 else 940 do_upload(pw, reader_id); 941 #else /* SMARTCARD */ 942 fatal("no support for smartcards."); 943 #endif /* SMARTCARD */ 944 } 945 946 arc4random_stir(); 947 948 type = key_type_from_name(key_type_name); 949 if (type == KEY_UNSPEC) { 950 fprintf(stderr, "unknown key type %s\n", key_type_name); 951 exit(1); 952 } 953 if (!quiet) 954 printf("Generating public/private %s key pair.\n", key_type_name); 955 private = key_generate(type, bits); 956 if (private == NULL) { 957 fprintf(stderr, "key_generate failed"); 958 exit(1); 959 } 960 public = key_from_private(private); 961 962 if (!have_identity) 963 ask_filename(pw, "Enter file in which to save the key"); 964 965 /* Create ~/.ssh directory if it doesn\'t already exist. */ 966 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 967 if (strstr(identity_file, dotsshdir) != NULL && 968 stat(dotsshdir, &st) < 0) { 969 if (mkdir(dotsshdir, 0700) < 0) 970 error("Could not create directory '%s'.", dotsshdir); 971 else if (!quiet) 972 printf("Created directory '%s'.\n", dotsshdir); 973 } 974 /* If the file already exists, ask the user to confirm. */ 975 if (stat(identity_file, &st) >= 0) { 976 char yesno[3]; 977 printf("%s already exists.\n", identity_file); 978 printf("Overwrite (y/n)? "); 979 fflush(stdout); 980 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 981 exit(1); 982 if (yesno[0] != 'y' && yesno[0] != 'Y') 983 exit(1); 984 } 985 /* Ask for a passphrase (twice). */ 986 if (identity_passphrase) 987 passphrase1 = xstrdup(identity_passphrase); 988 else if (identity_new_passphrase) 989 passphrase1 = xstrdup(identity_new_passphrase); 990 else { 991 passphrase_again: 992 passphrase1 = 993 read_passphrase("Enter passphrase (empty for no " 994 "passphrase): ", RP_ALLOW_STDIN); 995 passphrase2 = read_passphrase("Enter same passphrase again: ", 996 RP_ALLOW_STDIN); 997 if (strcmp(passphrase1, passphrase2) != 0) { 998 /* 999 * The passphrases do not match. Clear them and 1000 * retry. 1001 */ 1002 memset(passphrase1, 0, strlen(passphrase1)); 1003 memset(passphrase2, 0, strlen(passphrase2)); 1004 xfree(passphrase1); 1005 xfree(passphrase2); 1006 printf("Passphrases do not match. Try again.\n"); 1007 goto passphrase_again; 1008 } 1009 /* Clear the other copy of the passphrase. */ 1010 memset(passphrase2, 0, strlen(passphrase2)); 1011 xfree(passphrase2); 1012 } 1013 1014 if (identity_comment) { 1015 strlcpy(comment, identity_comment, sizeof(comment)); 1016 } else { 1017 /* Create default commend field for the passphrase. */ 1018 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1019 } 1020 1021 /* Save the key with the given passphrase and comment. */ 1022 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1023 printf("Saving the key failed: %s.\n", identity_file); 1024 memset(passphrase1, 0, strlen(passphrase1)); 1025 xfree(passphrase1); 1026 exit(1); 1027 } 1028 /* Clear the passphrase. */ 1029 memset(passphrase1, 0, strlen(passphrase1)); 1030 xfree(passphrase1); 1031 1032 /* Clear the private key and the random number generator. */ 1033 key_free(private); 1034 arc4random_stir(); 1035 1036 if (!quiet) 1037 printf("Your identification has been saved in %s.\n", identity_file); 1038 1039 strlcat(identity_file, ".pub", sizeof(identity_file)); 1040 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1041 if (fd == -1) { 1042 printf("Could not save your public key in %s\n", identity_file); 1043 exit(1); 1044 } 1045 f = fdopen(fd, "w"); 1046 if (f == NULL) { 1047 printf("fdopen %s failed", identity_file); 1048 exit(1); 1049 } 1050 if (!key_write(public, f)) 1051 fprintf(stderr, "write key failed"); 1052 fprintf(f, " %s\n", comment); 1053 fclose(f); 1054 1055 if (!quiet) { 1056 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1057 printf("Your public key has been saved in %s.\n", 1058 identity_file); 1059 printf("The key fingerprint is:\n"); 1060 printf("%s %s\n", fp, comment); 1061 xfree(fp); 1062 } 1063 1064 key_free(public); 1065 exit(0); 1066 } 1067