558 lines
14 KiB
C
558 lines
14 KiB
C
/*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
* Created: Mon Mar 27 02:26:40 1995 ylo
|
|
* Identity and host key generation and maintenance.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$Id: ssh-keygen.c,v 1.17 2000/03/16 20:56:14 markus Exp $");
|
|
|
|
#include "rsa.h"
|
|
#include "ssh.h"
|
|
#include "xmalloc.h"
|
|
#include "fingerprint.h"
|
|
|
|
/* Generated private key. */
|
|
RSA *private_key;
|
|
|
|
/* Generated public key. */
|
|
RSA *public_key;
|
|
|
|
/* Number of bits in the RSA key. This value can be changed on the command line. */
|
|
int bits = 1024;
|
|
|
|
/*
|
|
* Flag indicating that we just want to change the passphrase. This can be
|
|
* set on the command line.
|
|
*/
|
|
int change_passphrase = 0;
|
|
|
|
/*
|
|
* Flag indicating that we just want to change the comment. This can be set
|
|
* on the command line.
|
|
*/
|
|
int change_comment = 0;
|
|
|
|
int quiet = 0;
|
|
|
|
/* Flag indicating that we just want to see the key fingerprint */
|
|
int print_fingerprint = 0;
|
|
|
|
/* The identity file name, given on the command line or entered by the user. */
|
|
char identity_file[1024];
|
|
int have_identity = 0;
|
|
|
|
/* This is set to the passphrase if given on the command line. */
|
|
char *identity_passphrase = NULL;
|
|
|
|
/* This is set to the new passphrase if given on the command line. */
|
|
char *identity_new_passphrase = NULL;
|
|
|
|
/* This is set to the new comment if given on the command line. */
|
|
char *identity_comment = NULL;
|
|
|
|
/* argv0 */
|
|
extern char *__progname;
|
|
|
|
void
|
|
ask_filename(struct passwd *pw, const char *prompt)
|
|
{
|
|
char buf[1024];
|
|
snprintf(identity_file, sizeof(identity_file), "%s/%s",
|
|
pw->pw_dir, SSH_CLIENT_IDENTITY);
|
|
printf("%s (%s): ", prompt, identity_file);
|
|
fflush(stdout);
|
|
if (fgets(buf, sizeof(buf), stdin) == NULL)
|
|
exit(1);
|
|
if (strchr(buf, '\n'))
|
|
*strchr(buf, '\n') = 0;
|
|
if (strcmp(buf, "") != 0)
|
|
strlcpy(identity_file, buf, sizeof(identity_file));
|
|
have_identity = 1;
|
|
}
|
|
|
|
void
|
|
do_fingerprint(struct passwd *pw)
|
|
{
|
|
FILE *f;
|
|
BIGNUM *e, *n;
|
|
RSA *public_key;
|
|
char *comment = NULL, *cp, *ep, line[16*1024];
|
|
int i, skip = 0, num = 1, invalid = 1;
|
|
unsigned int ignore;
|
|
struct stat st;
|
|
|
|
if (!have_identity)
|
|
ask_filename(pw, "Enter file in which the key is");
|
|
if (stat(identity_file, &st) < 0) {
|
|
perror(identity_file);
|
|
exit(1);
|
|
}
|
|
|
|
public_key = RSA_new();
|
|
if (load_public_key(identity_file, public_key, &comment)) {
|
|
printf("%d %s %s\n", BN_num_bits(public_key->n),
|
|
fingerprint(public_key->e, public_key->n),
|
|
comment);
|
|
RSA_free(public_key);
|
|
exit(0);
|
|
}
|
|
RSA_free(public_key);
|
|
|
|
f = fopen(identity_file, "r");
|
|
if (f != NULL) {
|
|
n = BN_new();
|
|
e = BN_new();
|
|
while (fgets(line, sizeof(line), f)) {
|
|
i = strlen(line) - 1;
|
|
if (line[i] != '\n') {
|
|
error("line %d too long: %.40s...", num, line);
|
|
skip = 1;
|
|
continue;
|
|
}
|
|
num++;
|
|
if (skip) {
|
|
skip = 0;
|
|
continue;
|
|
}
|
|
line[i] = '\0';
|
|
|
|
/* Skip leading whitespace, empty and comment lines. */
|
|
for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
|
|
;
|
|
if (!*cp || *cp == '\n' || *cp == '#')
|
|
continue ;
|
|
i = strtol(cp, &ep, 10);
|
|
if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
|
|
int quoted = 0;
|
|
comment = cp;
|
|
for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
|
|
if (*cp == '\\' && cp[1] == '"')
|
|
cp++; /* Skip both */
|
|
else if (*cp == '"')
|
|
quoted = !quoted;
|
|
}
|
|
if (!*cp)
|
|
continue;
|
|
*cp++ = '\0';
|
|
}
|
|
ep = cp;
|
|
if (auth_rsa_read_key(&cp, &ignore, e, n)) {
|
|
invalid = 0;
|
|
comment = *cp ? cp : comment;
|
|
printf("%d %s %s\n", BN_num_bits(n),
|
|
fingerprint(e, n),
|
|
comment ? comment : "no comment");
|
|
}
|
|
}
|
|
BN_free(e);
|
|
BN_free(n);
|
|
fclose(f);
|
|
}
|
|
if (invalid) {
|
|
printf("%s is not a valid key file.\n", identity_file);
|
|
exit(1);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Perform changing a passphrase. The argument is the passwd structure
|
|
* for the current user.
|
|
*/
|
|
void
|
|
do_change_passphrase(struct passwd *pw)
|
|
{
|
|
char *comment;
|
|
char *old_passphrase, *passphrase1, *passphrase2;
|
|
struct stat st;
|
|
RSA *private_key;
|
|
|
|
if (!have_identity)
|
|
ask_filename(pw, "Enter file in which the key is");
|
|
if (stat(identity_file, &st) < 0) {
|
|
perror(identity_file);
|
|
exit(1);
|
|
}
|
|
public_key = RSA_new();
|
|
if (!load_public_key(identity_file, public_key, NULL)) {
|
|
printf("%s is not a valid key file.\n", identity_file);
|
|
exit(1);
|
|
}
|
|
/* Clear the public key since we are just about to load the whole file. */
|
|
RSA_free(public_key);
|
|
|
|
/* Try to load the file with empty passphrase. */
|
|
private_key = RSA_new();
|
|
if (!load_private_key(identity_file, "", private_key, &comment)) {
|
|
if (identity_passphrase)
|
|
old_passphrase = xstrdup(identity_passphrase);
|
|
else
|
|
old_passphrase = read_passphrase("Enter old passphrase: ", 1);
|
|
if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) {
|
|
memset(old_passphrase, 0, strlen(old_passphrase));
|
|
xfree(old_passphrase);
|
|
printf("Bad passphrase.\n");
|
|
exit(1);
|
|
}
|
|
memset(old_passphrase, 0, strlen(old_passphrase));
|
|
xfree(old_passphrase);
|
|
}
|
|
printf("Key has comment '%s'\n", comment);
|
|
|
|
/* Ask the new passphrase (twice). */
|
|
if (identity_new_passphrase) {
|
|
passphrase1 = xstrdup(identity_new_passphrase);
|
|
passphrase2 = NULL;
|
|
} else {
|
|
passphrase1 =
|
|
read_passphrase("Enter new passphrase (empty for no passphrase): ", 1);
|
|
passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
|
|
|
|
/* Verify that they are the same. */
|
|
if (strcmp(passphrase1, passphrase2) != 0) {
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
memset(passphrase2, 0, strlen(passphrase2));
|
|
xfree(passphrase1);
|
|
xfree(passphrase2);
|
|
printf("Pass phrases do not match. Try again.\n");
|
|
exit(1);
|
|
}
|
|
/* Destroy the other copy. */
|
|
memset(passphrase2, 0, strlen(passphrase2));
|
|
xfree(passphrase2);
|
|
}
|
|
|
|
/* Save the file using the new passphrase. */
|
|
if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
|
|
printf("Saving the key failed: %s: %s.\n",
|
|
identity_file, strerror(errno));
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
xfree(passphrase1);
|
|
RSA_free(private_key);
|
|
xfree(comment);
|
|
exit(1);
|
|
}
|
|
/* Destroy the passphrase and the copy of the key in memory. */
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
xfree(passphrase1);
|
|
RSA_free(private_key); /* Destroys contents */
|
|
xfree(comment);
|
|
|
|
printf("Your identification has been saved with the new passphrase.\n");
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Change the comment of a private key file.
|
|
*/
|
|
void
|
|
do_change_comment(struct passwd *pw)
|
|
{
|
|
char new_comment[1024], *comment;
|
|
RSA *private_key;
|
|
char *passphrase;
|
|
struct stat st;
|
|
FILE *f;
|
|
char *tmpbuf;
|
|
|
|
if (!have_identity)
|
|
ask_filename(pw, "Enter file in which the key is");
|
|
if (stat(identity_file, &st) < 0) {
|
|
perror(identity_file);
|
|
exit(1);
|
|
}
|
|
/*
|
|
* Try to load the public key from the file the verify that it is
|
|
* readable and of the proper format.
|
|
*/
|
|
public_key = RSA_new();
|
|
if (!load_public_key(identity_file, public_key, NULL)) {
|
|
printf("%s is not a valid key file.\n", identity_file);
|
|
exit(1);
|
|
}
|
|
private_key = RSA_new();
|
|
|
|
if (load_private_key(identity_file, "", private_key, &comment))
|
|
passphrase = xstrdup("");
|
|
else {
|
|
if (identity_passphrase)
|
|
passphrase = xstrdup(identity_passphrase);
|
|
else if (identity_new_passphrase)
|
|
passphrase = xstrdup(identity_new_passphrase);
|
|
else
|
|
passphrase = read_passphrase("Enter passphrase: ", 1);
|
|
/* Try to load using the passphrase. */
|
|
if (!load_private_key(identity_file, passphrase, private_key, &comment)) {
|
|
memset(passphrase, 0, strlen(passphrase));
|
|
xfree(passphrase);
|
|
printf("Bad passphrase.\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
printf("Key now has comment '%s'\n", comment);
|
|
|
|
if (identity_comment) {
|
|
strlcpy(new_comment, identity_comment, sizeof(new_comment));
|
|
} else {
|
|
printf("Enter new comment: ");
|
|
fflush(stdout);
|
|
if (!fgets(new_comment, sizeof(new_comment), stdin)) {
|
|
memset(passphrase, 0, strlen(passphrase));
|
|
RSA_free(private_key);
|
|
exit(1);
|
|
}
|
|
if (strchr(new_comment, '\n'))
|
|
*strchr(new_comment, '\n') = 0;
|
|
}
|
|
|
|
/* Save the file using the new passphrase. */
|
|
if (!save_private_key(identity_file, passphrase, private_key, new_comment)) {
|
|
printf("Saving the key failed: %s: %s.\n",
|
|
identity_file, strerror(errno));
|
|
memset(passphrase, 0, strlen(passphrase));
|
|
xfree(passphrase);
|
|
RSA_free(private_key);
|
|
xfree(comment);
|
|
exit(1);
|
|
}
|
|
memset(passphrase, 0, strlen(passphrase));
|
|
xfree(passphrase);
|
|
RSA_free(private_key);
|
|
|
|
strlcat(identity_file, ".pub", sizeof(identity_file));
|
|
f = fopen(identity_file, "w");
|
|
if (!f) {
|
|
printf("Could not save your public key in %s\n", identity_file);
|
|
exit(1);
|
|
}
|
|
fprintf(f, "%d ", BN_num_bits(public_key->n));
|
|
tmpbuf = BN_bn2dec(public_key->e);
|
|
fprintf(f, "%s ", tmpbuf);
|
|
free(tmpbuf);
|
|
tmpbuf = BN_bn2dec(public_key->n);
|
|
fprintf(f, "%s %s\n", tmpbuf, new_comment);
|
|
free(tmpbuf);
|
|
fclose(f);
|
|
|
|
xfree(comment);
|
|
|
|
printf("The comment in your key file has been changed.\n");
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
printf("ssh-keygen version %s\n", SSH_VERSION);
|
|
printf("Usage: %s [-b bits] [-p] [-c] [-l] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname);
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Main program for key management.
|
|
*/
|
|
int
|
|
main(int ac, char **av)
|
|
{
|
|
char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2;
|
|
struct passwd *pw;
|
|
char *tmpbuf;
|
|
int opt;
|
|
struct stat st;
|
|
FILE *f;
|
|
char hostname[MAXHOSTNAMELEN];
|
|
extern int optind;
|
|
extern char *optarg;
|
|
|
|
/* check if RSA support exists */
|
|
if (rsa_alive() == 0) {
|
|
fprintf(stderr,
|
|
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
|
|
__progname);
|
|
exit(1);
|
|
}
|
|
/* we need this for the home * directory. */
|
|
pw = getpwuid(getuid());
|
|
if (!pw) {
|
|
printf("You don't exist, go away!\n");
|
|
exit(1);
|
|
}
|
|
|
|
while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) {
|
|
switch (opt) {
|
|
case 'b':
|
|
bits = atoi(optarg);
|
|
if (bits < 512 || bits > 32768) {
|
|
printf("Bits has bad value.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
case 'l':
|
|
print_fingerprint = 1;
|
|
break;
|
|
|
|
case 'p':
|
|
change_passphrase = 1;
|
|
break;
|
|
|
|
case 'c':
|
|
change_comment = 1;
|
|
break;
|
|
|
|
case 'f':
|
|
strlcpy(identity_file, optarg, sizeof(identity_file));
|
|
have_identity = 1;
|
|
break;
|
|
|
|
case 'P':
|
|
identity_passphrase = optarg;
|
|
break;
|
|
|
|
case 'N':
|
|
identity_new_passphrase = optarg;
|
|
break;
|
|
|
|
case 'C':
|
|
identity_comment = optarg;
|
|
break;
|
|
|
|
case 'q':
|
|
quiet = 1;
|
|
break;
|
|
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
if (optind < ac) {
|
|
printf("Too many arguments.\n");
|
|
usage();
|
|
}
|
|
if (change_passphrase && change_comment) {
|
|
printf("Can only have one of -p and -c.\n");
|
|
usage();
|
|
}
|
|
if (print_fingerprint)
|
|
do_fingerprint(pw);
|
|
if (change_passphrase)
|
|
do_change_passphrase(pw);
|
|
if (change_comment)
|
|
do_change_comment(pw);
|
|
|
|
arc4random_stir();
|
|
|
|
if (quiet)
|
|
rsa_set_verbose(0);
|
|
|
|
/* Generate the rsa key pair. */
|
|
private_key = RSA_new();
|
|
public_key = RSA_new();
|
|
rsa_generate_key(private_key, public_key, bits);
|
|
|
|
if (!have_identity)
|
|
ask_filename(pw, "Enter file in which to save the key");
|
|
|
|
/* Create ~/.ssh directory if it doesn\'t already exist. */
|
|
snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR);
|
|
if (strstr(identity_file, dotsshdir) != NULL &&
|
|
stat(dotsshdir, &st) < 0) {
|
|
if (mkdir(dotsshdir, 0755) < 0)
|
|
error("Could not create directory '%s'.", dotsshdir);
|
|
else if (!quiet)
|
|
printf("Created directory '%s'.\n", dotsshdir);
|
|
}
|
|
/* If the file already exists, ask the user to confirm. */
|
|
if (stat(identity_file, &st) >= 0) {
|
|
char yesno[3];
|
|
printf("%s already exists.\n", identity_file);
|
|
printf("Overwrite (y/n)? ");
|
|
fflush(stdout);
|
|
if (fgets(yesno, sizeof(yesno), stdin) == NULL)
|
|
exit(1);
|
|
if (yesno[0] != 'y' && yesno[0] != 'Y')
|
|
exit(1);
|
|
}
|
|
/* Ask for a passphrase (twice). */
|
|
if (identity_passphrase)
|
|
passphrase1 = xstrdup(identity_passphrase);
|
|
else if (identity_new_passphrase)
|
|
passphrase1 = xstrdup(identity_new_passphrase);
|
|
else {
|
|
passphrase_again:
|
|
passphrase1 =
|
|
read_passphrase("Enter passphrase (empty for no passphrase): ", 1);
|
|
passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
|
|
if (strcmp(passphrase1, passphrase2) != 0) {
|
|
/* The passphrases do not match. Clear them and retry. */
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
memset(passphrase2, 0, strlen(passphrase2));
|
|
xfree(passphrase1);
|
|
xfree(passphrase2);
|
|
printf("Passphrases do not match. Try again.\n");
|
|
goto passphrase_again;
|
|
}
|
|
/* Clear the other copy of the passphrase. */
|
|
memset(passphrase2, 0, strlen(passphrase2));
|
|
xfree(passphrase2);
|
|
}
|
|
|
|
if (identity_comment) {
|
|
strlcpy(comment, identity_comment, sizeof(comment));
|
|
} else {
|
|
/* Create default commend field for the passphrase. */
|
|
if (gethostname(hostname, sizeof(hostname)) < 0) {
|
|
perror("gethostname");
|
|
exit(1);
|
|
}
|
|
snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
|
|
}
|
|
|
|
/* Save the key with the given passphrase and comment. */
|
|
if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
|
|
printf("Saving the key failed: %s: %s.\n",
|
|
identity_file, strerror(errno));
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
xfree(passphrase1);
|
|
exit(1);
|
|
}
|
|
/* Clear the passphrase. */
|
|
memset(passphrase1, 0, strlen(passphrase1));
|
|
xfree(passphrase1);
|
|
|
|
/* Clear the private key and the random number generator. */
|
|
RSA_free(private_key);
|
|
arc4random_stir();
|
|
|
|
if (!quiet)
|
|
printf("Your identification has been saved in %s.\n", identity_file);
|
|
|
|
strlcat(identity_file, ".pub", sizeof(identity_file));
|
|
f = fopen(identity_file, "w");
|
|
if (!f) {
|
|
printf("Could not save your public key in %s\n", identity_file);
|
|
exit(1);
|
|
}
|
|
fprintf(f, "%d ", BN_num_bits(public_key->n));
|
|
tmpbuf = BN_bn2dec(public_key->e);
|
|
fprintf(f, "%s ", tmpbuf);
|
|
free(tmpbuf);
|
|
tmpbuf = BN_bn2dec(public_key->n);
|
|
fprintf(f, "%s %s\n", tmpbuf, comment);
|
|
free(tmpbuf);
|
|
fclose(f);
|
|
|
|
if (!quiet) {
|
|
printf("Your public key has been saved in %s.\n", identity_file);
|
|
printf("The key fingerprint is:\n");
|
|
printf("%d %s %s\n", BN_num_bits(public_key->n),
|
|
fingerprint(public_key->e, public_key->n),
|
|
comment);
|
|
}
|
|
exit(0);
|
|
}
|