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 1.81 2001/09/17 20:50:22 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 /* 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 if (key_to_blob(k, &blob, &len) <= 0) { 163 fprintf(stderr, "key_to_blob failed\n"); 164 exit(1); 165 } 166 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 167 fprintf(stdout, 168 "Comment: \"%d-bit %s, converted from OpenSSH by %s@%s\"\n", 169 key_size(k), key_type(k), 170 pw->pw_name, hostname); 171 dump_base64(stdout, blob, len); 172 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 173 key_free(k); 174 xfree(blob); 175 exit(0); 176 } 177 178 static void 179 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 180 { 181 int bits = buffer_get_int(b); 182 int bytes = (bits + 7) / 8; 183 184 if (buffer_len(b) < bytes) 185 fatal("buffer_get_bignum_bits: input buffer too small: " 186 "need %d have %d", bytes, buffer_len(b)); 187 BN_bin2bn((u_char *)buffer_ptr(b), bytes, value); 188 buffer_consume(b, bytes); 189 } 190 191 static Key * 192 do_convert_private_ssh2_from_blob(u_char *blob, int blen) 193 { 194 Buffer b; 195 Key *key = NULL; 196 char *type, *cipher; 197 u_char *sig, data[] = "abcde12345"; 198 int magic, rlen, ktype, i1, i2, i3, i4; 199 u_int slen; 200 u_long e; 201 202 buffer_init(&b); 203 buffer_append(&b, blob, blen); 204 205 magic = buffer_get_int(&b); 206 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 207 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 208 buffer_free(&b); 209 return NULL; 210 } 211 i1 = buffer_get_int(&b); 212 type = buffer_get_string(&b, NULL); 213 cipher = buffer_get_string(&b, NULL); 214 i2 = buffer_get_int(&b); 215 i3 = buffer_get_int(&b); 216 i4 = buffer_get_int(&b); 217 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 218 if (strcmp(cipher, "none") != 0) { 219 error("unsupported cipher %s", cipher); 220 xfree(cipher); 221 buffer_free(&b); 222 xfree(type); 223 return NULL; 224 } 225 xfree(cipher); 226 227 if (strstr(type, "dsa")) { 228 ktype = KEY_DSA; 229 } else if (strstr(type, "rsa")) { 230 ktype = KEY_RSA; 231 } else { 232 xfree(type); 233 return NULL; 234 } 235 key = key_new_private(ktype); 236 xfree(type); 237 238 switch (key->type) { 239 case KEY_DSA: 240 buffer_get_bignum_bits(&b, key->dsa->p); 241 buffer_get_bignum_bits(&b, key->dsa->g); 242 buffer_get_bignum_bits(&b, key->dsa->q); 243 buffer_get_bignum_bits(&b, key->dsa->pub_key); 244 buffer_get_bignum_bits(&b, key->dsa->priv_key); 245 break; 246 case KEY_RSA: 247 e = buffer_get_char(&b); 248 debug("e %lx", e); 249 if (e < 30) { 250 e <<= 8; 251 e += buffer_get_char(&b); 252 debug("e %lx", e); 253 e <<= 8; 254 e += buffer_get_char(&b); 255 debug("e %lx", e); 256 } 257 if (!BN_set_word(key->rsa->e, e)) { 258 buffer_free(&b); 259 key_free(key); 260 return NULL; 261 } 262 buffer_get_bignum_bits(&b, key->rsa->d); 263 buffer_get_bignum_bits(&b, key->rsa->n); 264 buffer_get_bignum_bits(&b, key->rsa->iqmp); 265 buffer_get_bignum_bits(&b, key->rsa->q); 266 buffer_get_bignum_bits(&b, key->rsa->p); 267 rsa_generate_additional_parameters(key->rsa); 268 break; 269 } 270 rlen = buffer_len(&b); 271 if(rlen != 0) 272 error("do_convert_private_ssh2_from_blob: " 273 "remaining bytes in key blob %d", rlen); 274 buffer_free(&b); 275 276 /* try the key */ 277 key_sign(key, &sig, &slen, data, sizeof(data)); 278 key_verify(key, sig, slen, data, sizeof(data)); 279 xfree(sig); 280 return key; 281 } 282 283 static void 284 do_convert_from_ssh2(struct passwd *pw) 285 { 286 Key *k; 287 int blen; 288 char line[1024], *p; 289 u_char blob[8096]; 290 char encoded[8096]; 291 struct stat st; 292 int escaped = 0, private = 0, ok; 293 FILE *fp; 294 295 if (!have_identity) 296 ask_filename(pw, "Enter file in which the key is"); 297 if (stat(identity_file, &st) < 0) { 298 perror(identity_file); 299 exit(1); 300 } 301 fp = fopen(identity_file, "r"); 302 if (fp == NULL) { 303 perror(identity_file); 304 exit(1); 305 } 306 encoded[0] = '\0'; 307 while (fgets(line, sizeof(line), fp)) { 308 if (!(p = strchr(line, '\n'))) { 309 fprintf(stderr, "input line too long.\n"); 310 exit(1); 311 } 312 if (p > line && p[-1] == '\\') 313 escaped++; 314 if (strncmp(line, "----", 4) == 0 || 315 strstr(line, ": ") != NULL) { 316 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 317 private = 1; 318 if (strstr(line, " END ") != NULL) { 319 break; 320 } 321 /* fprintf(stderr, "ignore: %s", line); */ 322 continue; 323 } 324 if (escaped) { 325 escaped--; 326 /* fprintf(stderr, "escaped: %s", line); */ 327 continue; 328 } 329 *p = '\0'; 330 strlcat(encoded, line, sizeof(encoded)); 331 } 332 blen = uudecode(encoded, (u_char *)blob, sizeof(blob)); 333 if (blen < 0) { 334 fprintf(stderr, "uudecode failed.\n"); 335 exit(1); 336 } 337 k = private ? 338 do_convert_private_ssh2_from_blob(blob, blen) : 339 key_from_blob(blob, blen); 340 if (k == NULL) { 341 fprintf(stderr, "decode blob failed.\n"); 342 exit(1); 343 } 344 ok = private ? 345 (k->type == KEY_DSA ? 346 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 347 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 348 key_write(k, stdout); 349 if (!ok) { 350 fprintf(stderr, "key write failed"); 351 exit(1); 352 } 353 key_free(k); 354 fprintf(stdout, "\n"); 355 fclose(fp); 356 exit(0); 357 } 358 359 static void 360 do_print_public(struct passwd *pw) 361 { 362 Key *prv; 363 struct stat st; 364 365 if (!have_identity) 366 ask_filename(pw, "Enter file in which the key is"); 367 if (stat(identity_file, &st) < 0) { 368 perror(identity_file); 369 exit(1); 370 } 371 prv = load_identity(identity_file); 372 if (prv == NULL) { 373 fprintf(stderr, "load failed\n"); 374 exit(1); 375 } 376 if (!key_write(prv, stdout)) 377 fprintf(stderr, "key_write failed"); 378 key_free(prv); 379 fprintf(stdout, "\n"); 380 exit(0); 381 } 382 383 #ifdef SMARTCARD 384 #define NUM_RSA_KEY_ELEMENTS 5+1 385 #define COPY_RSA_KEY(x, i) \ 386 do { \ 387 len = BN_num_bytes(prv->rsa->x); \ 388 elements[i] = xmalloc(len); \ 389 debug("#bytes %d", len); \ 390 if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \ 391 goto done; \ 392 } while(0) 393 394 static int 395 get_AUT0(char *aut0) 396 { 397 EVP_MD *evp_md = EVP_sha1(); 398 EVP_MD_CTX md; 399 char *pass; 400 401 pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 402 if (pass == NULL) 403 return -1; 404 EVP_DigestInit(&md, evp_md); 405 EVP_DigestUpdate(&md, pass, strlen(pass)); 406 EVP_DigestFinal(&md, aut0, NULL); 407 memset(pass, 0, strlen(pass)); 408 xfree(pass); 409 return 0; 410 } 411 412 static void 413 do_upload(struct passwd *pw, const char *sc_reader_id) 414 { 415 Key *prv = NULL; 416 struct stat st; 417 u_char *elements[NUM_RSA_KEY_ELEMENTS]; 418 u_char key_fid[2]; 419 u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63}; 420 u_char AUT0[EVP_MAX_MD_SIZE]; 421 int len, status = 1, i, fd = -1, ret; 422 int sw = 0, cla = 0x00; 423 424 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 425 elements[i] = NULL; 426 if (!have_identity) 427 ask_filename(pw, "Enter file in which the key is"); 428 if (stat(identity_file, &st) < 0) { 429 perror(identity_file); 430 goto done; 431 } 432 prv = load_identity(identity_file); 433 if (prv == NULL) { 434 error("load failed"); 435 goto done; 436 } 437 COPY_RSA_KEY(q, 0); 438 COPY_RSA_KEY(p, 1); 439 COPY_RSA_KEY(iqmp, 2); 440 COPY_RSA_KEY(dmq1, 3); 441 COPY_RSA_KEY(dmp1, 4); 442 COPY_RSA_KEY(n, 5); 443 len = BN_num_bytes(prv->rsa->n); 444 fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw); 445 if (fd < 0) { 446 error("sectok_open failed: %s", sectok_get_sw(sw)); 447 goto done; 448 } 449 if (! sectok_cardpresent(fd)) { 450 error("smartcard in reader %s not present", 451 sc_reader_id); 452 goto done; 453 } 454 ret = sectok_reset(fd, 0, NULL, &sw); 455 if (ret <= 0) { 456 error("sectok_reset failed: %s", sectok_get_sw(sw)); 457 goto done; 458 } 459 if ((cla = cyberflex_inq_class(fd)) < 0) { 460 error("cyberflex_inq_class failed"); 461 goto done; 462 } 463 memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0)); 464 if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 465 if (get_AUT0(AUT0) < 0 || 466 cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) { 467 error("cyberflex_verify_AUT0 failed"); 468 goto done; 469 } 470 } 471 key_fid[0] = 0x00; 472 key_fid[1] = 0x12; 473 if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements, 474 &sw) < 0) { 475 error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw)); 476 goto done; 477 } 478 if (!sectok_swOK(sw)) 479 goto done; 480 log("cyberflex_load_rsa_priv done"); 481 key_fid[0] = 0x73; 482 key_fid[1] = 0x68; 483 if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5], 484 &sw) < 0) { 485 error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw)); 486 goto done; 487 } 488 if (!sectok_swOK(sw)) 489 goto done; 490 log("cyberflex_load_rsa_pub done"); 491 status = 0; 492 log("loading key done"); 493 done: 494 if (prv) 495 key_free(prv); 496 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++) 497 if (elements[i]) 498 xfree(elements[i]); 499 if (fd != -1) 500 sectok_close(fd); 501 exit(status); 502 } 503 504 static void 505 do_download(struct passwd *pw, const char *sc_reader_id) 506 { 507 Key *pub = NULL; 508 509 pub = sc_get_key(sc_reader_id); 510 if (pub == NULL) 511 fatal("cannot read public key from smartcard"); 512 key_write(pub, stdout); 513 key_free(pub); 514 fprintf(stdout, "\n"); 515 exit(0); 516 } 517 #endif /* SMARTCARD */ 518 519 static void 520 do_fingerprint(struct passwd *pw) 521 { 522 FILE *f; 523 Key *public; 524 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 525 int i, skip = 0, num = 1, invalid = 1, rep, fptype; 526 struct stat st; 527 528 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 529 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 530 531 if (!have_identity) 532 ask_filename(pw, "Enter file in which the key is"); 533 if (stat(identity_file, &st) < 0) { 534 perror(identity_file); 535 exit(1); 536 } 537 public = key_load_public(identity_file, &comment); 538 if (public != NULL) { 539 fp = key_fingerprint(public, fptype, rep); 540 printf("%d %s %s\n", key_size(public), fp, comment); 541 key_free(public); 542 xfree(comment); 543 xfree(fp); 544 exit(0); 545 } 546 if (comment) 547 xfree(comment); 548 549 f = fopen(identity_file, "r"); 550 if (f != NULL) { 551 while (fgets(line, sizeof(line), f)) { 552 i = strlen(line) - 1; 553 if (line[i] != '\n') { 554 error("line %d too long: %.40s...", num, line); 555 skip = 1; 556 continue; 557 } 558 num++; 559 if (skip) { 560 skip = 0; 561 continue; 562 } 563 line[i] = '\0'; 564 565 /* Skip leading whitespace, empty and comment lines. */ 566 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 567 ; 568 if (!*cp || *cp == '\n' || *cp == '#') 569 continue ; 570 i = strtol(cp, &ep, 10); 571 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 572 int quoted = 0; 573 comment = cp; 574 for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { 575 if (*cp == '\\' && cp[1] == '"') 576 cp++; /* Skip both */ 577 else if (*cp == '"') 578 quoted = !quoted; 579 } 580 if (!*cp) 581 continue; 582 *cp++ = '\0'; 583 } 584 ep = cp; 585 public = key_new(KEY_RSA1); 586 if (key_read(public, &cp) != 1) { 587 cp = ep; 588 key_free(public); 589 public = key_new(KEY_UNSPEC); 590 if (key_read(public, &cp) != 1) { 591 key_free(public); 592 continue; 593 } 594 } 595 comment = *cp ? cp : comment; 596 fp = key_fingerprint(public, fptype, rep); 597 printf("%d %s %s\n", key_size(public), fp, 598 comment ? comment : "no comment"); 599 xfree(fp); 600 key_free(public); 601 invalid = 0; 602 } 603 fclose(f); 604 } 605 if (invalid) { 606 printf("%s is not a valid key file.\n", identity_file); 607 exit(1); 608 } 609 exit(0); 610 } 611 612 /* 613 * Perform changing a passphrase. The argument is the passwd structure 614 * for the current user. 615 */ 616 static void 617 do_change_passphrase(struct passwd *pw) 618 { 619 char *comment; 620 char *old_passphrase, *passphrase1, *passphrase2; 621 struct stat st; 622 Key *private; 623 624 if (!have_identity) 625 ask_filename(pw, "Enter file in which the key is"); 626 if (stat(identity_file, &st) < 0) { 627 perror(identity_file); 628 exit(1); 629 } 630 /* Try to load the file with empty passphrase. */ 631 private = key_load_private(identity_file, "", &comment); 632 if (private == NULL) { 633 if (identity_passphrase) 634 old_passphrase = xstrdup(identity_passphrase); 635 else 636 old_passphrase = 637 read_passphrase("Enter old passphrase: ", 638 RP_ALLOW_STDIN); 639 private = key_load_private(identity_file, old_passphrase, 640 &comment); 641 memset(old_passphrase, 0, strlen(old_passphrase)); 642 xfree(old_passphrase); 643 if (private == NULL) { 644 printf("Bad passphrase.\n"); 645 exit(1); 646 } 647 } 648 printf("Key has comment '%s'\n", comment); 649 650 /* Ask the new passphrase (twice). */ 651 if (identity_new_passphrase) { 652 passphrase1 = xstrdup(identity_new_passphrase); 653 passphrase2 = NULL; 654 } else { 655 passphrase1 = 656 read_passphrase("Enter new passphrase (empty for no " 657 "passphrase): ", RP_ALLOW_STDIN); 658 passphrase2 = read_passphrase("Enter same passphrase again: ", 659 RP_ALLOW_STDIN); 660 661 /* Verify that they are the same. */ 662 if (strcmp(passphrase1, passphrase2) != 0) { 663 memset(passphrase1, 0, strlen(passphrase1)); 664 memset(passphrase2, 0, strlen(passphrase2)); 665 xfree(passphrase1); 666 xfree(passphrase2); 667 printf("Pass phrases do not match. Try again.\n"); 668 exit(1); 669 } 670 /* Destroy the other copy. */ 671 memset(passphrase2, 0, strlen(passphrase2)); 672 xfree(passphrase2); 673 } 674 675 /* Save the file using the new passphrase. */ 676 if (!key_save_private(private, identity_file, passphrase1, comment)) { 677 printf("Saving the key failed: %s.\n", identity_file); 678 memset(passphrase1, 0, strlen(passphrase1)); 679 xfree(passphrase1); 680 key_free(private); 681 xfree(comment); 682 exit(1); 683 } 684 /* Destroy the passphrase and the copy of the key in memory. */ 685 memset(passphrase1, 0, strlen(passphrase1)); 686 xfree(passphrase1); 687 key_free(private); /* Destroys contents */ 688 xfree(comment); 689 690 printf("Your identification has been saved with the new passphrase.\n"); 691 exit(0); 692 } 693 694 /* 695 * Change the comment of a private key file. 696 */ 697 static void 698 do_change_comment(struct passwd *pw) 699 { 700 char new_comment[1024], *comment, *passphrase; 701 Key *private; 702 Key *public; 703 struct stat st; 704 FILE *f; 705 int fd; 706 707 if (!have_identity) 708 ask_filename(pw, "Enter file in which the key is"); 709 if (stat(identity_file, &st) < 0) { 710 perror(identity_file); 711 exit(1); 712 } 713 private = key_load_private(identity_file, "", &comment); 714 if (private == NULL) { 715 if (identity_passphrase) 716 passphrase = xstrdup(identity_passphrase); 717 else if (identity_new_passphrase) 718 passphrase = xstrdup(identity_new_passphrase); 719 else 720 passphrase = read_passphrase("Enter passphrase: ", 721 RP_ALLOW_STDIN); 722 /* Try to load using the passphrase. */ 723 private = key_load_private(identity_file, passphrase, &comment); 724 if (private == NULL) { 725 memset(passphrase, 0, strlen(passphrase)); 726 xfree(passphrase); 727 printf("Bad passphrase.\n"); 728 exit(1); 729 } 730 } else { 731 passphrase = xstrdup(""); 732 } 733 if (private->type != KEY_RSA1) { 734 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 735 key_free(private); 736 exit(1); 737 } 738 printf("Key now has comment '%s'\n", comment); 739 740 if (identity_comment) { 741 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 742 } else { 743 printf("Enter new comment: "); 744 fflush(stdout); 745 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 746 memset(passphrase, 0, strlen(passphrase)); 747 key_free(private); 748 exit(1); 749 } 750 if (strchr(new_comment, '\n')) 751 *strchr(new_comment, '\n') = 0; 752 } 753 754 /* Save the file using the new passphrase. */ 755 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 756 printf("Saving the key failed: %s.\n", identity_file); 757 memset(passphrase, 0, strlen(passphrase)); 758 xfree(passphrase); 759 key_free(private); 760 xfree(comment); 761 exit(1); 762 } 763 memset(passphrase, 0, strlen(passphrase)); 764 xfree(passphrase); 765 public = key_from_private(private); 766 key_free(private); 767 768 strlcat(identity_file, ".pub", sizeof(identity_file)); 769 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 770 if (fd == -1) { 771 printf("Could not save your public key in %s\n", identity_file); 772 exit(1); 773 } 774 f = fdopen(fd, "w"); 775 if (f == NULL) { 776 printf("fdopen %s failed", identity_file); 777 exit(1); 778 } 779 if (!key_write(public, f)) 780 fprintf(stderr, "write key failed"); 781 key_free(public); 782 fprintf(f, " %s\n", new_comment); 783 fclose(f); 784 785 xfree(comment); 786 787 printf("The comment in your key file has been changed.\n"); 788 exit(0); 789 } 790 791 static void 792 usage(void) 793 { 794 fprintf(stderr, "Usage: %s [options]\n", __progname); 795 fprintf(stderr, "Options:\n"); 796 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 797 fprintf(stderr, " -c Change comment in private and public key files.\n"); 798 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 799 fprintf(stderr, " -f filename Filename of the key file.\n"); 800 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 801 fprintf(stderr, " -l Show fingerprint of key file.\n"); 802 fprintf(stderr, " -p Change passphrase of private key file.\n"); 803 fprintf(stderr, " -q Quiet.\n"); 804 fprintf(stderr, " -y Read private key file and print public key.\n"); 805 fprintf(stderr, " -t type Specify type of key to create.\n"); 806 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 807 fprintf(stderr, " -C comment Provide new comment.\n"); 808 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 809 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 810 #ifdef SMARTCARD 811 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 812 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 813 #endif /* SMARTCARD */ 814 815 exit(1); 816 } 817 818 /* 819 * Main program for key management. 820 */ 821 int 822 main(int ac, char **av) 823 { 824 char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2; 825 char *reader_id = NULL; 826 Key *private, *public; 827 struct passwd *pw; 828 struct stat st; 829 int opt, type, fd, download = 0; 830 FILE *f; 831 832 extern int optind; 833 extern char *optarg; 834 835 SSLeay_add_all_algorithms(); 836 837 /* we need this for the home * directory. */ 838 pw = getpwuid(getuid()); 839 if (!pw) { 840 printf("You don't exist, go away!\n"); 841 exit(1); 842 } 843 if (gethostname(hostname, sizeof(hostname)) < 0) { 844 perror("gethostname"); 845 exit(1); 846 } 847 848 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { 849 switch (opt) { 850 case 'b': 851 bits = atoi(optarg); 852 if (bits < 512 || bits > 32768) { 853 printf("Bits has bad value.\n"); 854 exit(1); 855 } 856 break; 857 case 'l': 858 print_fingerprint = 1; 859 break; 860 case 'B': 861 print_bubblebabble = 1; 862 break; 863 case 'p': 864 change_passphrase = 1; 865 break; 866 case 'c': 867 change_comment = 1; 868 break; 869 case 'f': 870 strlcpy(identity_file, optarg, sizeof(identity_file)); 871 have_identity = 1; 872 break; 873 case 'P': 874 identity_passphrase = optarg; 875 break; 876 case 'N': 877 identity_new_passphrase = optarg; 878 break; 879 case 'C': 880 identity_comment = optarg; 881 break; 882 case 'q': 883 quiet = 1; 884 break; 885 case 'R': 886 /* unused */ 887 exit(0); 888 break; 889 case 'e': 890 case 'x': 891 /* export key */ 892 convert_to_ssh2 = 1; 893 break; 894 case 'i': 895 case 'X': 896 /* import key */ 897 convert_from_ssh2 = 1; 898 break; 899 case 'y': 900 print_public = 1; 901 break; 902 case 'd': 903 key_type_name = "dsa"; 904 break; 905 case 't': 906 key_type_name = optarg; 907 break; 908 case 'D': 909 download = 1; 910 case 'U': 911 reader_id = optarg; 912 break; 913 case '?': 914 default: 915 usage(); 916 } 917 } 918 if (optind < ac) { 919 printf("Too many arguments.\n"); 920 usage(); 921 } 922 if (change_passphrase && change_comment) { 923 printf("Can only have one of -p and -c.\n"); 924 usage(); 925 } 926 if (print_fingerprint || print_bubblebabble) 927 do_fingerprint(pw); 928 if (change_passphrase) 929 do_change_passphrase(pw); 930 if (change_comment) 931 do_change_comment(pw); 932 if (convert_to_ssh2) 933 do_convert_to_ssh2(pw); 934 if (convert_from_ssh2) 935 do_convert_from_ssh2(pw); 936 if (print_public) 937 do_print_public(pw); 938 if (reader_id != NULL) { 939 #ifdef SMARTCARD 940 if (download) 941 do_download(pw, reader_id); 942 else 943 do_upload(pw, reader_id); 944 #else /* SMARTCARD */ 945 fatal("no support for smartcards."); 946 #endif /* SMARTCARD */ 947 } 948 949 arc4random_stir(); 950 951 type = key_type_from_name(key_type_name); 952 if (type == KEY_UNSPEC) { 953 fprintf(stderr, "unknown key type %s\n", key_type_name); 954 exit(1); 955 } 956 if (!quiet) 957 printf("Generating public/private %s key pair.\n", key_type_name); 958 private = key_generate(type, bits); 959 if (private == NULL) { 960 fprintf(stderr, "key_generate failed"); 961 exit(1); 962 } 963 public = key_from_private(private); 964 965 if (!have_identity) 966 ask_filename(pw, "Enter file in which to save the key"); 967 968 /* Create ~/.ssh directory if it doesn\'t already exist. */ 969 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 970 if (strstr(identity_file, dotsshdir) != NULL && 971 stat(dotsshdir, &st) < 0) { 972 if (mkdir(dotsshdir, 0700) < 0) 973 error("Could not create directory '%s'.", dotsshdir); 974 else if (!quiet) 975 printf("Created directory '%s'.\n", dotsshdir); 976 } 977 /* If the file already exists, ask the user to confirm. */ 978 if (stat(identity_file, &st) >= 0) { 979 char yesno[3]; 980 printf("%s already exists.\n", identity_file); 981 printf("Overwrite (y/n)? "); 982 fflush(stdout); 983 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 984 exit(1); 985 if (yesno[0] != 'y' && yesno[0] != 'Y') 986 exit(1); 987 } 988 /* Ask for a passphrase (twice). */ 989 if (identity_passphrase) 990 passphrase1 = xstrdup(identity_passphrase); 991 else if (identity_new_passphrase) 992 passphrase1 = xstrdup(identity_new_passphrase); 993 else { 994 passphrase_again: 995 passphrase1 = 996 read_passphrase("Enter passphrase (empty for no " 997 "passphrase): ", RP_ALLOW_STDIN); 998 passphrase2 = read_passphrase("Enter same passphrase again: ", 999 RP_ALLOW_STDIN); 1000 if (strcmp(passphrase1, passphrase2) != 0) { 1001 /* 1002 * The passphrases do not match. Clear them and 1003 * retry. 1004 */ 1005 memset(passphrase1, 0, strlen(passphrase1)); 1006 memset(passphrase2, 0, strlen(passphrase2)); 1007 xfree(passphrase1); 1008 xfree(passphrase2); 1009 printf("Passphrases do not match. Try again.\n"); 1010 goto passphrase_again; 1011 } 1012 /* Clear the other copy of the passphrase. */ 1013 memset(passphrase2, 0, strlen(passphrase2)); 1014 xfree(passphrase2); 1015 } 1016 1017 if (identity_comment) { 1018 strlcpy(comment, identity_comment, sizeof(comment)); 1019 } else { 1020 /* Create default commend field for the passphrase. */ 1021 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1022 } 1023 1024 /* Save the key with the given passphrase and comment. */ 1025 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1026 printf("Saving the key failed: %s.\n", identity_file); 1027 memset(passphrase1, 0, strlen(passphrase1)); 1028 xfree(passphrase1); 1029 exit(1); 1030 } 1031 /* Clear the passphrase. */ 1032 memset(passphrase1, 0, strlen(passphrase1)); 1033 xfree(passphrase1); 1034 1035 /* Clear the private key and the random number generator. */ 1036 key_free(private); 1037 arc4random_stir(); 1038 1039 if (!quiet) 1040 printf("Your identification has been saved in %s.\n", identity_file); 1041 1042 strlcat(identity_file, ".pub", sizeof(identity_file)); 1043 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1044 if (fd == -1) { 1045 printf("Could not save your public key in %s\n", identity_file); 1046 exit(1); 1047 } 1048 f = fdopen(fd, "w"); 1049 if (f == NULL) { 1050 printf("fdopen %s failed", identity_file); 1051 exit(1); 1052 } 1053 if (!key_write(public, f)) 1054 fprintf(stderr, "write key failed"); 1055 fprintf(f, " %s\n", comment); 1056 fclose(f); 1057 1058 if (!quiet) { 1059 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1060 printf("Your public key has been saved in %s.\n", 1061 identity_file); 1062 printf("The key fingerprint is:\n"); 1063 printf("%s %s\n", fp, comment); 1064 xfree(fp); 1065 } 1066 1067 key_free(public); 1068 exit(0); 1069 } 1070