1 /* $OpenBSD: ssh-keygen.c,v 1.149 2006/07/17 01:31:10 stevesk Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Identity and host key generation and maintenance.
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
17 #include <sys/types.h>
18 #include <sys/socket.h>
21 #include <openssl/evp.h>
22 #include <openssl/pem.h>
26 #if defined(HAVE_NETDB_H)
42 #include "pathnames.h"
53 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
54 #define DEFAULT_BITS 2048
55 #define DEFAULT_BITS_DSA 1024
59 * Flag indicating that we just want to change the passphrase. This can be
60 * set on the command line.
62 int change_passphrase = 0;
65 * Flag indicating that we just want to change the comment. This can be set
66 * on the command line.
68 int change_comment = 0;
72 /* Flag indicating that we want to hash a known_hosts file */
74 /* Flag indicating that we want lookup a host in known_hosts file */
76 /* Flag indicating that we want to delete a host from a known_hosts file */
79 /* Flag indicating that we just want to see the key fingerprint */
80 int print_fingerprint = 0;
81 int print_bubblebabble = 0;
83 /* The identity file name, given on the command line or entered by the user. */
84 char identity_file[1024];
85 int have_identity = 0;
87 /* This is set to the passphrase if given on the command line. */
88 char *identity_passphrase = NULL;
90 /* This is set to the new passphrase if given on the command line. */
91 char *identity_new_passphrase = NULL;
93 /* This is set to the new comment if given on the command line. */
94 char *identity_comment = NULL;
96 /* Dump public key file in format used by real and the original SSH 2 */
97 int convert_to_ssh2 = 0;
98 int convert_from_ssh2 = 0;
100 int print_generic = 0;
102 char *key_type_name = NULL;
105 extern char *__progname;
107 char hostname[MAXHOSTNAMELEN];
110 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
111 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
114 ask_filename(struct passwd *pw, const char *prompt)
119 if (key_type_name == NULL)
120 name = _PATH_SSH_CLIENT_ID_RSA;
122 switch (key_type_from_name(key_type_name)) {
124 name = _PATH_SSH_CLIENT_IDENTITY;
127 name = _PATH_SSH_CLIENT_ID_DSA;
130 name = _PATH_SSH_CLIENT_ID_RSA;
133 fprintf(stderr, "bad key type");
138 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
139 fprintf(stderr, "%s (%s): ", prompt, identity_file);
140 if (fgets(buf, sizeof(buf), stdin) == NULL)
142 if (strchr(buf, '\n'))
143 *strchr(buf, '\n') = 0;
144 if (strcmp(buf, "") != 0)
145 strlcpy(identity_file, buf, sizeof(identity_file));
150 load_identity(char *filename)
155 prv = key_load_private(filename, "", NULL);
157 if (identity_passphrase)
158 pass = xstrdup(identity_passphrase);
160 pass = read_passphrase("Enter passphrase: ",
162 prv = key_load_private(filename, pass, NULL);
163 memset(pass, 0, strlen(pass));
169 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
170 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
171 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
172 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
175 do_convert_to_ssh2(struct passwd *pw)
183 ask_filename(pw, "Enter file in which the key is");
184 if (stat(identity_file, &st) < 0) {
185 perror(identity_file);
188 if ((k = key_load_public(identity_file, NULL)) == NULL) {
189 if ((k = load_identity(identity_file)) == NULL) {
190 fprintf(stderr, "load failed\n");
194 if (k->type == KEY_RSA1) {
195 fprintf(stderr, "version 1 keys are not supported\n");
198 if (key_to_blob(k, &blob, &len) <= 0) {
199 fprintf(stderr, "key_to_blob failed\n");
202 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
204 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
205 key_size(k), key_type(k),
206 pw->pw_name, hostname);
207 dump_base64(stdout, blob, len);
208 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
215 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
217 u_int bignum_bits = buffer_get_int(b);
218 u_int bytes = (bignum_bits + 7) / 8;
220 if (buffer_len(b) < bytes)
221 fatal("buffer_get_bignum_bits: input buffer too small: "
222 "need %d have %d", bytes, buffer_len(b));
223 BN_bin2bn(buffer_ptr(b), bytes, value);
224 buffer_consume(b, bytes);
228 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
233 u_char *sig, data[] = "abcde12345";
234 int magic, rlen, ktype, i1, i2, i3, i4;
239 buffer_append(&b, blob, blen);
241 magic = buffer_get_int(&b);
242 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
243 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
247 i1 = buffer_get_int(&b);
248 type = buffer_get_string(&b, NULL);
249 cipher = buffer_get_string(&b, NULL);
250 i2 = buffer_get_int(&b);
251 i3 = buffer_get_int(&b);
252 i4 = buffer_get_int(&b);
253 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
254 if (strcmp(cipher, "none") != 0) {
255 error("unsupported cipher %s", cipher);
263 if (strstr(type, "dsa")) {
265 } else if (strstr(type, "rsa")) {
272 key = key_new_private(ktype);
277 buffer_get_bignum_bits(&b, key->dsa->p);
278 buffer_get_bignum_bits(&b, key->dsa->g);
279 buffer_get_bignum_bits(&b, key->dsa->q);
280 buffer_get_bignum_bits(&b, key->dsa->pub_key);
281 buffer_get_bignum_bits(&b, key->dsa->priv_key);
284 e = buffer_get_char(&b);
288 e += buffer_get_char(&b);
291 e += buffer_get_char(&b);
294 if (!BN_set_word(key->rsa->e, e)) {
299 buffer_get_bignum_bits(&b, key->rsa->d);
300 buffer_get_bignum_bits(&b, key->rsa->n);
301 buffer_get_bignum_bits(&b, key->rsa->iqmp);
302 buffer_get_bignum_bits(&b, key->rsa->q);
303 buffer_get_bignum_bits(&b, key->rsa->p);
304 rsa_generate_additional_parameters(key->rsa);
307 rlen = buffer_len(&b);
309 error("do_convert_private_ssh2_from_blob: "
310 "remaining bytes in key blob %d", rlen);
314 key_sign(key, &sig, &slen, data, sizeof(data));
315 key_verify(key, sig, slen, data, sizeof(data));
321 get_line(FILE *fp, char *line, size_t len)
327 while ((c = fgetc(fp)) != EOF) {
328 if (pos >= len - 1) {
329 fprintf(stderr, "input line too long.\n");
335 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
336 fprintf(stderr, "unget: %s\n", strerror(errno));
352 do_convert_from_ssh2(struct passwd *pw)
361 int escaped = 0, private = 0, ok;
365 ask_filename(pw, "Enter file in which the key is");
366 if (stat(identity_file, &st) < 0) {
367 perror(identity_file);
370 fp = fopen(identity_file, "r");
372 perror(identity_file);
376 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
377 if (line[blen - 1] == '\\')
379 if (strncmp(line, "----", 4) == 0 ||
380 strstr(line, ": ") != NULL) {
381 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
383 if (strstr(line, " END ") != NULL) {
386 /* fprintf(stderr, "ignore: %s", line); */
391 /* fprintf(stderr, "escaped: %s", line); */
394 strlcat(encoded, line, sizeof(encoded));
396 len = strlen(encoded);
397 if (((len % 4) == 3) &&
398 (encoded[len-1] == '=') &&
399 (encoded[len-2] == '=') &&
400 (encoded[len-3] == '='))
401 encoded[len-3] = '\0';
402 blen = uudecode(encoded, blob, sizeof(blob));
404 fprintf(stderr, "uudecode failed.\n");
408 do_convert_private_ssh2_from_blob(blob, blen) :
409 key_from_blob(blob, blen);
411 fprintf(stderr, "decode blob failed.\n");
415 (k->type == KEY_DSA ?
416 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
417 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
418 key_write(k, stdout);
420 fprintf(stderr, "key write failed");
425 fprintf(stdout, "\n");
431 do_print_public(struct passwd *pw)
437 ask_filename(pw, "Enter file in which the key is");
438 if (stat(identity_file, &st) < 0) {
439 perror(identity_file);
442 prv = load_identity(identity_file);
444 fprintf(stderr, "load failed\n");
447 if (!key_write(prv, stdout))
448 fprintf(stderr, "key_write failed");
450 fprintf(stdout, "\n");
456 do_upload(struct passwd *pw, const char *sc_reader_id)
463 ask_filename(pw, "Enter file in which the key is");
464 if (stat(identity_file, &st) < 0) {
465 perror(identity_file);
468 prv = load_identity(identity_file);
470 error("load failed");
473 ret = sc_put_key(prv, sc_reader_id);
477 logit("loading key done");
482 do_download(struct passwd *pw, const char *sc_reader_id)
487 keys = sc_get_keys(sc_reader_id, NULL);
489 fatal("cannot read public key from smartcard");
490 for (i = 0; keys[i]; i++) {
491 key_write(keys[i], stdout);
493 fprintf(stdout, "\n");
498 #endif /* SMARTCARD */
501 do_fingerprint(struct passwd *pw)
505 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
506 int i, skip = 0, num = 1, invalid = 1;
511 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
512 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
515 ask_filename(pw, "Enter file in which the key is");
516 if (stat(identity_file, &st) < 0) {
517 perror(identity_file);
520 public = key_load_public(identity_file, &comment);
521 if (public != NULL) {
522 fp = key_fingerprint(public, fptype, rep);
523 printf("%u %s %s\n", key_size(public), fp, comment);
534 f = fopen(identity_file, "r");
536 while (fgets(line, sizeof(line), f)) {
537 i = strlen(line) - 1;
538 if (line[i] != '\n') {
539 error("line %d too long: %.40s...", num, line);
550 /* Skip leading whitespace, empty and comment lines. */
551 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
553 if (!*cp || *cp == '\n' || *cp == '#')
555 i = strtol(cp, &ep, 10);
556 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
559 for (; *cp && (quoted || (*cp != ' ' &&
560 *cp != '\t')); cp++) {
561 if (*cp == '\\' && cp[1] == '"')
562 cp++; /* Skip both */
571 public = key_new(KEY_RSA1);
572 if (key_read(public, &cp) != 1) {
575 public = key_new(KEY_UNSPEC);
576 if (key_read(public, &cp) != 1) {
581 comment = *cp ? cp : comment;
582 fp = key_fingerprint(public, fptype, rep);
583 printf("%u %s %s\n", key_size(public), fp,
584 comment ? comment : "no comment");
592 printf("%s is not a public key file.\n", identity_file);
599 print_host(FILE *f, char *name, Key *public, int hash)
601 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
602 fatal("hash_host failed");
603 fprintf(f, "%s ", name);
604 if (!key_write(public, f))
605 fatal("key_write failed");
610 do_known_hosts(struct passwd *pw, const char *name)
612 FILE *in, *out = stdout;
614 char *cp, *cp2, *kp, *kp2;
615 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
616 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
618 if (!have_identity) {
619 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
620 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
621 sizeof(identity_file))
622 fatal("Specified known hosts path too long");
626 if ((in = fopen(identity_file, "r")) == NULL)
627 fatal("fopen: %s", strerror(errno));
630 * Find hosts goes to stdout, hash and deletions happen in-place
631 * A corner case is ssh-keygen -HF foo, which should go to stdout
633 if (!find_host && (hash_hosts || delete_host)) {
634 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
635 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
636 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
637 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
638 fatal("known_hosts path too long");
640 if ((c = mkstemp(tmp)) == -1)
641 fatal("mkstemp: %s", strerror(errno));
642 if ((out = fdopen(c, "w")) == NULL) {
645 fatal("fdopen: %s", strerror(c));
650 while (fgets(line, sizeof(line), in)) {
652 i = strlen(line) - 1;
653 if (line[i] != '\n') {
654 error("line %d too long: %.40s...", num, line);
665 /* Skip leading whitespace, empty and comment lines. */
666 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
668 if (!*cp || *cp == '\n' || *cp == '#') {
670 fprintf(out, "%s\n", cp);
673 /* Find the end of the host name portion. */
674 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
676 if (*kp == '\0' || *(kp + 1) == '\0') {
677 error("line %d missing key: %.40s...",
685 public = key_new(KEY_RSA1);
686 if (key_read(public, &kp) != 1) {
689 public = key_new(KEY_UNSPEC);
690 if (key_read(public, &kp) != 1) {
691 error("line %d invalid key: %.40s...",
699 if (*cp == HASH_DELIM) {
700 if (find_host || delete_host) {
701 cp2 = host_hash(name, cp, strlen(cp));
703 error("line %d: invalid hashed "
704 "name: %.64s...", num, line);
708 c = (strcmp(cp2, cp) == 0);
709 if (find_host && c) {
710 printf("# Host %s found: "
711 "line %d type %s\n", name,
712 num, key_type(public));
713 print_host(out, cp, public, 0);
715 if (delete_host && !c)
716 print_host(out, cp, public, 0);
717 } else if (hash_hosts)
718 print_host(out, cp, public, 0);
720 if (find_host || delete_host) {
721 c = (match_hostname(name, cp,
723 if (find_host && c) {
724 printf("# Host %s found: "
725 "line %d type %s\n", name,
726 num, key_type(public));
727 print_host(out, cp, public, hash_hosts);
729 if (delete_host && !c)
730 print_host(out, cp, public, 0);
731 } else if (hash_hosts) {
732 for (cp2 = strsep(&cp, ",");
733 cp2 != NULL && *cp2 != '\0';
734 cp2 = strsep(&cp, ",")) {
735 if (strcspn(cp2, "*?!") != strlen(cp2))
736 fprintf(stderr, "Warning: "
737 "ignoring host name with "
738 "metacharacters: %.64s\n",
741 print_host(out, cp2, public, 1);
751 fprintf(stderr, "%s is not a valid known_host file.\n",
754 fprintf(stderr, "Not replacing existing known_hosts "
755 "file because of errors\n");
765 /* Backup existing file */
766 if (unlink(old) == -1 && errno != ENOENT)
767 fatal("unlink %.100s: %s", old, strerror(errno));
768 if (link(identity_file, old) == -1)
769 fatal("link %.100s to %.100s: %s", identity_file, old,
771 /* Move new one into place */
772 if (rename(tmp, identity_file) == -1) {
773 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
780 fprintf(stderr, "%s updated.\n", identity_file);
781 fprintf(stderr, "Original contents retained as %s\n", old);
783 fprintf(stderr, "WARNING: %s contains unhashed "
785 fprintf(stderr, "Delete this file to ensure privacy "
794 * Perform changing a passphrase. The argument is the passwd structure
795 * for the current user.
798 do_change_passphrase(struct passwd *pw)
801 char *old_passphrase, *passphrase1, *passphrase2;
806 ask_filename(pw, "Enter file in which the key is");
807 if (stat(identity_file, &st) < 0) {
808 perror(identity_file);
811 /* Try to load the file with empty passphrase. */
812 private = key_load_private(identity_file, "", &comment);
813 if (private == NULL) {
814 if (identity_passphrase)
815 old_passphrase = xstrdup(identity_passphrase);
818 read_passphrase("Enter old passphrase: ",
820 private = key_load_private(identity_file, old_passphrase,
822 memset(old_passphrase, 0, strlen(old_passphrase));
823 xfree(old_passphrase);
824 if (private == NULL) {
825 printf("Bad passphrase.\n");
829 printf("Key has comment '%s'\n", comment);
831 /* Ask the new passphrase (twice). */
832 if (identity_new_passphrase) {
833 passphrase1 = xstrdup(identity_new_passphrase);
837 read_passphrase("Enter new passphrase (empty for no "
838 "passphrase): ", RP_ALLOW_STDIN);
839 passphrase2 = read_passphrase("Enter same passphrase again: ",
842 /* Verify that they are the same. */
843 if (strcmp(passphrase1, passphrase2) != 0) {
844 memset(passphrase1, 0, strlen(passphrase1));
845 memset(passphrase2, 0, strlen(passphrase2));
848 printf("Pass phrases do not match. Try again.\n");
851 /* Destroy the other copy. */
852 memset(passphrase2, 0, strlen(passphrase2));
856 /* Save the file using the new passphrase. */
857 if (!key_save_private(private, identity_file, passphrase1, comment)) {
858 printf("Saving the key failed: %s.\n", identity_file);
859 memset(passphrase1, 0, strlen(passphrase1));
865 /* Destroy the passphrase and the copy of the key in memory. */
866 memset(passphrase1, 0, strlen(passphrase1));
868 key_free(private); /* Destroys contents */
871 printf("Your identification has been saved with the new passphrase.\n");
876 * Print the SSHFP RR.
879 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
882 char *comment = NULL;
886 ask_filename(pw, "Enter file in which the key is");
887 if (stat(fname, &st) < 0) {
893 public = key_load_public(fname, &comment);
894 if (public != NULL) {
895 export_dns_rr(hname, public, stdout, print_generic);
903 printf("failed to read v2 public key from %s.\n", fname);
908 * Change the comment of a private key file.
911 do_change_comment(struct passwd *pw)
913 char new_comment[1024], *comment, *passphrase;
921 ask_filename(pw, "Enter file in which the key is");
922 if (stat(identity_file, &st) < 0) {
923 perror(identity_file);
926 private = key_load_private(identity_file, "", &comment);
927 if (private == NULL) {
928 if (identity_passphrase)
929 passphrase = xstrdup(identity_passphrase);
930 else if (identity_new_passphrase)
931 passphrase = xstrdup(identity_new_passphrase);
933 passphrase = read_passphrase("Enter passphrase: ",
935 /* Try to load using the passphrase. */
936 private = key_load_private(identity_file, passphrase, &comment);
937 if (private == NULL) {
938 memset(passphrase, 0, strlen(passphrase));
940 printf("Bad passphrase.\n");
944 passphrase = xstrdup("");
946 if (private->type != KEY_RSA1) {
947 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
951 printf("Key now has comment '%s'\n", comment);
953 if (identity_comment) {
954 strlcpy(new_comment, identity_comment, sizeof(new_comment));
956 printf("Enter new comment: ");
958 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
959 memset(passphrase, 0, strlen(passphrase));
963 if (strchr(new_comment, '\n'))
964 *strchr(new_comment, '\n') = 0;
967 /* Save the file using the new passphrase. */
968 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
969 printf("Saving the key failed: %s.\n", identity_file);
970 memset(passphrase, 0, strlen(passphrase));
976 memset(passphrase, 0, strlen(passphrase));
978 public = key_from_private(private);
981 strlcat(identity_file, ".pub", sizeof(identity_file));
982 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
984 printf("Could not save your public key in %s\n", identity_file);
989 printf("fdopen %s failed", identity_file);
992 if (!key_write(public, f))
993 fprintf(stderr, "write key failed");
995 fprintf(f, " %s\n", new_comment);
1000 printf("The comment in your key file has been changed.\n");
1007 fprintf(stderr, "Usage: %s [options]\n", __progname);
1008 fprintf(stderr, "Options:\n");
1009 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1010 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1011 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1012 fprintf(stderr, " -C comment Provide new comment.\n");
1013 fprintf(stderr, " -c Change comment in private and public key files.\n");
1015 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1016 #endif /* SMARTCARD */
1017 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
1018 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1019 fprintf(stderr, " -f filename Filename of the key file.\n");
1020 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1021 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1022 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1023 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
1024 fprintf(stderr, " -l Show fingerprint of key file.\n");
1025 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1026 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1027 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1028 fprintf(stderr, " -p Change passphrase of private key file.\n");
1029 fprintf(stderr, " -q Quiet.\n");
1030 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1031 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1032 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1033 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1034 fprintf(stderr, " -t type Specify type of key to create.\n");
1036 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1037 #endif /* SMARTCARD */
1038 fprintf(stderr, " -v Verbose.\n");
1039 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1040 fprintf(stderr, " -y Read private key file and print public key.\n");
1046 * Main program for key management.
1049 main(int ac, char **av)
1051 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1052 char out_file[MAXPATHLEN], *reader_id = NULL;
1053 char *rr_hostname = NULL;
1054 Key *private, *public;
1057 int opt, type, fd, download = 0;
1058 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1059 int do_gen_candidates = 0, do_screen_candidates = 0;
1060 int log_level = SYSLOG_LEVEL_INFO;
1061 BIGNUM *start = NULL;
1066 extern char *optarg;
1068 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1071 __progname = ssh_get_progname(av[0]);
1073 SSLeay_add_all_algorithms();
1074 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1079 /* we need this for the home * directory. */
1080 pw = getpwuid(getuid());
1082 printf("You don't exist, go away!\n");
1085 if (gethostname(hostname, sizeof(hostname)) < 0) {
1086 perror("gethostname");
1090 while ((opt = getopt(ac, av,
1091 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1094 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1096 fatal("Bits has bad value %s (%s)",
1101 rr_hostname = optarg;
1108 rr_hostname = optarg;
1111 print_fingerprint = 1;
1114 print_bubblebabble = 1;
1117 change_passphrase = 1;
1123 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1124 sizeof(identity_file))
1125 fatal("Identity filename too long");
1132 identity_passphrase = optarg;
1135 identity_new_passphrase = optarg;
1138 identity_comment = optarg;
1146 convert_to_ssh2 = 1;
1151 convert_from_ssh2 = 1;
1157 key_type_name = "dsa";
1160 key_type_name = optarg;
1169 if (log_level == SYSLOG_LEVEL_INFO)
1170 log_level = SYSLOG_LEVEL_DEBUG1;
1172 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1173 log_level < SYSLOG_LEVEL_DEBUG3)
1178 rr_hostname = optarg;
1181 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1184 fatal("Desired generator has bad value: %s (%s)",
1188 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1190 fatal("Invalid number of trials: %s (%s)",
1194 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1196 fatal("Memory limit is %s: %s", errstr, optarg);
1200 do_gen_candidates = 1;
1201 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1203 fatal("Output filename too long");
1206 do_screen_candidates = 1;
1207 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1209 fatal("Output filename too long");
1212 /* XXX - also compare length against bits */
1213 if (BN_hex2bn(&start, optarg) == 0)
1214 fatal("Invalid start point.");
1223 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1226 printf("Too many arguments.\n");
1229 if (change_passphrase && change_comment) {
1230 printf("Can only have one of -p and -c.\n");
1233 if (delete_host || hash_hosts || find_host)
1234 do_known_hosts(pw, rr_hostname);
1235 if (print_fingerprint || print_bubblebabble)
1237 if (change_passphrase)
1238 do_change_passphrase(pw);
1240 do_change_comment(pw);
1241 if (convert_to_ssh2)
1242 do_convert_to_ssh2(pw);
1243 if (convert_from_ssh2)
1244 do_convert_from_ssh2(pw);
1246 do_print_public(pw);
1247 if (rr_hostname != NULL) {
1250 if (have_identity) {
1251 n = do_print_resource_record(pw,
1252 identity_file, rr_hostname);
1254 perror(identity_file);
1260 n += do_print_resource_record(pw,
1261 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1262 n += do_print_resource_record(pw,
1263 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1266 fatal("no keys found.");
1270 if (reader_id != NULL) {
1273 do_download(pw, reader_id);
1275 do_upload(pw, reader_id);
1276 #else /* SMARTCARD */
1277 fatal("no support for smartcards.");
1278 #endif /* SMARTCARD */
1281 if (do_gen_candidates) {
1282 FILE *out = fopen(out_file, "w");
1285 error("Couldn't open modulus candidate file \"%s\": %s",
1286 out_file, strerror(errno));
1290 bits = DEFAULT_BITS;
1291 if (gen_candidates(out, memory, bits, start) != 0)
1292 fatal("modulus candidate generation failed");
1297 if (do_screen_candidates) {
1299 FILE *out = fopen(out_file, "w");
1301 if (have_identity && strcmp(identity_file, "-") != 0) {
1302 if ((in = fopen(identity_file, "r")) == NULL) {
1303 fatal("Couldn't open modulus candidate "
1304 "file \"%s\": %s", identity_file,
1311 fatal("Couldn't open moduli file \"%s\": %s",
1312 out_file, strerror(errno));
1314 if (prime_test(in, out, trials, generator_wanted) != 0)
1315 fatal("modulus screening failed");
1321 if (key_type_name == NULL)
1322 key_type_name = "rsa";
1324 type = key_type_from_name(key_type_name);
1325 if (type == KEY_UNSPEC) {
1326 fprintf(stderr, "unknown key type %s\n", key_type_name);
1330 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1331 if (type == KEY_DSA && bits != 1024)
1332 fatal("DSA keys must be 1024 bits");
1334 printf("Generating public/private %s key pair.\n", key_type_name);
1335 private = key_generate(type, bits);
1336 if (private == NULL) {
1337 fprintf(stderr, "key_generate failed");
1340 public = key_from_private(private);
1343 ask_filename(pw, "Enter file in which to save the key");
1345 /* Create ~/.ssh directory if it doesn't already exist. */
1346 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1347 if (strstr(identity_file, dotsshdir) != NULL &&
1348 stat(dotsshdir, &st) < 0) {
1349 if (mkdir(dotsshdir, 0700) < 0)
1350 error("Could not create directory '%s'.", dotsshdir);
1352 printf("Created directory '%s'.\n", dotsshdir);
1354 /* If the file already exists, ask the user to confirm. */
1355 if (stat(identity_file, &st) >= 0) {
1357 printf("%s already exists.\n", identity_file);
1358 printf("Overwrite (y/n)? ");
1360 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1362 if (yesno[0] != 'y' && yesno[0] != 'Y')
1365 /* Ask for a passphrase (twice). */
1366 if (identity_passphrase)
1367 passphrase1 = xstrdup(identity_passphrase);
1368 else if (identity_new_passphrase)
1369 passphrase1 = xstrdup(identity_new_passphrase);
1373 read_passphrase("Enter passphrase (empty for no "
1374 "passphrase): ", RP_ALLOW_STDIN);
1375 passphrase2 = read_passphrase("Enter same passphrase again: ",
1377 if (strcmp(passphrase1, passphrase2) != 0) {
1379 * The passphrases do not match. Clear them and
1382 memset(passphrase1, 0, strlen(passphrase1));
1383 memset(passphrase2, 0, strlen(passphrase2));
1386 printf("Passphrases do not match. Try again.\n");
1387 goto passphrase_again;
1389 /* Clear the other copy of the passphrase. */
1390 memset(passphrase2, 0, strlen(passphrase2));
1394 if (identity_comment) {
1395 strlcpy(comment, identity_comment, sizeof(comment));
1397 /* Create default commend field for the passphrase. */
1398 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1401 /* Save the key with the given passphrase and comment. */
1402 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1403 printf("Saving the key failed: %s.\n", identity_file);
1404 memset(passphrase1, 0, strlen(passphrase1));
1408 /* Clear the passphrase. */
1409 memset(passphrase1, 0, strlen(passphrase1));
1412 /* Clear the private key and the random number generator. */
1417 printf("Your identification has been saved in %s.\n", identity_file);
1419 strlcat(identity_file, ".pub", sizeof(identity_file));
1420 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1422 printf("Could not save your public key in %s\n", identity_file);
1425 f = fdopen(fd, "w");
1427 printf("fdopen %s failed", identity_file);
1430 if (!key_write(public, f))
1431 fprintf(stderr, "write key failed");
1432 fprintf(f, " %s\n", comment);
1436 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1437 printf("Your public key has been saved in %s.\n",
1439 printf("The key fingerprint is:\n");
1440 printf("%s %s\n", fp, comment);