[openssh.git] / ssh-keygen.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("$Id$");

#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 */
#ifdef HAVE___PROGNAME
extern char *__progname;
#else /* HAVE___PROGNAME */
const char *__progname = "ssh-keygen";
#endif /* HAVE___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)
{
	char *comment;
	RSA *public_key;
	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)) {
		char *cp, line[1024];
		BIGNUM *e, *n;
		int dummy, invalid = 0;
		FILE *f = fopen(identity_file, "r");
		n = BN_new();
		e = BN_new();
		if (f && fgets(line, sizeof(line), f)) {
			cp = line;
			line[strlen(line) - 1] = '\0';
			if (auth_rsa_read_key(&cp, &dummy, e, n)) {
				public_key->e = e;
				public_key->n = n;
				comment = xstrdup(cp ? cp : "no comment");
			} else {
				invalid = 1;
			}
		} else {
			invalid = 1;
		}
		if (invalid) {
			printf("%s is not a valid key file.\n", identity_file);
			BN_free(e);
			BN_free(n);
			exit(1);
		}
	}
	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);
}

/*
 * 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] [-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);
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	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	* Created: Mon Mar 27 02:26:40 1995 ylo
	6	* Identity and host key generation and maintenance.
	7	*/
8efc0c15	8
	9	#include "includes.h"
	10	RCSID("$Id$");
	11
	12	#include "rsa.h"
	13	#include "ssh.h"
	14	#include "xmalloc.h"
f095fcc7	15	#include "fingerprint.h"
8efc0c15	16
	17	/* Generated private key. */
	18	RSA *private_key;
	19
	20	/* Generated public key. */
	21	RSA *public_key;
	22
aa3378df	23	/* Number of bits in the RSA key. This value can be changed on the command line. */
8efc0c15	24	int bits = 1024;
8efc0c15	25
aa3378df	26	/*
	27	* Flag indicating that we just want to change the passphrase. This can be
	28	* set on the command line.
	29	*/
8efc0c15	30	int change_passphrase = 0;
8efc0c15	31
aa3378df	32	/*
	33	* Flag indicating that we just want to change the comment. This can be set
	34	* on the command line.
	35	*/
8efc0c15	36	int change_comment = 0;
	37
	38	int quiet = 0;
	39
f095fcc7	40	/* Flag indicating that we just want to see the key fingerprint */
	41	int print_fingerprint = 0;
	42
5ad13cd7	43	/* The identity file name, given on the command line or entered by the user. */
	44	char identity_file[1024];
	45	int have_identity = 0;
8efc0c15	46
	47	/* This is set to the passphrase if given on the command line. */
	48	char *identity_passphrase = NULL;
	49
	50	/* This is set to the new passphrase if given on the command line. */
	51	char *identity_new_passphrase = NULL;
	52
	53	/* This is set to the new comment if given on the command line. */
	54	char *identity_comment = NULL;
	55
5ad13cd7	56	/* argv0 */
5260325f	57	#ifdef HAVE___PROGNAME
5ad13cd7	58	extern char *__progname;
5260325f	59	#else /* HAVE___PROGNAME */
	60	const char *__progname = "ssh-keygen";
	61	#endif /* HAVE___PROGNAME */
8efc0c15	62
5ad13cd7	63	void
5ad13cd7	64	ask_filename(struct passwd pw, const char prompt)
8efc0c15	65	{
5260325f	66	char buf[1024];
	67	snprintf(identity_file, sizeof(identity_file), "%s/%s",
	68	pw->pw_dir, SSH_CLIENT_IDENTITY);
	69	printf("%s (%s): ", prompt, identity_file);
	70	fflush(stdout);
	71	if (fgets(buf, sizeof(buf), stdin) == NULL)
	72	exit(1);
	73	if (strchr(buf, '\n'))
	74	*strchr(buf, '\n') = 0;
	75	if (strcmp(buf, "") != 0)
	76	strlcpy(identity_file, buf, sizeof(identity_file));
	77	have_identity = 1;
f095fcc7	78	}
8efc0c15	79
f095fcc7	80	void
	81	do_fingerprint(struct passwd *pw)
	82	{
5260325f	83	char *comment;
	84	RSA *public_key;
	85	struct stat st;
	86
	87	if (!have_identity)
	88	ask_filename(pw, "Enter file in which the key is");
	89	if (stat(identity_file, &st) < 0) {
	90	perror(identity_file);
	91	exit(1);
	92	}
	93	public_key = RSA_new();
	94	if (!load_public_key(identity_file, public_key, &comment)) {
	95	char *cp, line[1024];
	96	BIGNUM e, n;
	97	int dummy, invalid = 0;
	98	FILE *f = fopen(identity_file, "r");
	99	n = BN_new();
	100	e = BN_new();
	101	if (f && fgets(line, sizeof(line), f)) {
	102	cp = line;
	103	line[strlen(line) - 1] = '\0';
	104	if (auth_rsa_read_key(&cp, &dummy, e, n)) {
	105	public_key->e = e;
	106	public_key->n = n;
	107	comment = xstrdup(cp ? cp : "no comment");
	108	} else {
	109	invalid = 1;
	110	}
	111	} else {
	112	invalid = 1;
	113	}
	114	if (invalid) {
	115	printf("%s is not a valid key file.\n", identity_file);
	116	BN_free(e);
	117	BN_free(n);
	118	exit(1);
	119	}
	120	}
	121	printf("%d %s %s\n", BN_num_bits(public_key->n),
	122	fingerprint(public_key->e, public_key->n),
	123	comment);
	124	RSA_free(public_key);
	125	exit(0);
f095fcc7	126	}
f095fcc7	127
5260325f	128	/*
	129	* Perform changing a passphrase. The argument is the passwd structure
	130	* for the current user.
	131	*/
f095fcc7	132	void
	133	do_change_passphrase(struct passwd *pw)
	134	{
5260325f	135	char *comment;
	136	char old_passphrase, passphrase1, *passphrase2;
	137	struct stat st;
	138	RSA *private_key;
	139
	140	if (!have_identity)
	141	ask_filename(pw, "Enter file in which the key is");
5260325f	142	if (stat(identity_file, &st) < 0) {
	143	perror(identity_file);
	144	exit(1);
	145	}
5260325f	146	public_key = RSA_new();
	147	if (!load_public_key(identity_file, public_key, NULL)) {
	148	printf("%s is not a valid key file.\n", identity_file);
	149	exit(1);
	150	}
	151	/* Clear the public key since we are just about to load the whole file. */
	152	RSA_free(public_key);
	153
	154	/* Try to load the file with empty passphrase. */
	155	private_key = RSA_new();
	156	if (!load_private_key(identity_file, "", private_key, &comment)) {
5260325f	157	if (identity_passphrase)
	158	old_passphrase = xstrdup(identity_passphrase);
	159	else
	160	old_passphrase = read_passphrase("Enter old passphrase: ", 1);
5260325f	161	if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) {
	162	memset(old_passphrase, 0, strlen(old_passphrase));
	163	xfree(old_passphrase);
	164	printf("Bad passphrase.\n");
	165	exit(1);
	166	}
5260325f	167	memset(old_passphrase, 0, strlen(old_passphrase));
	168	xfree(old_passphrase);
	169	}
	170	printf("Key has comment '%s'\n", comment);
	171
	172	/* Ask the new passphrase (twice). */
	173	if (identity_new_passphrase) {
	174	passphrase1 = xstrdup(identity_new_passphrase);
	175	passphrase2 = NULL;
	176	} else {
	177	passphrase1 =
	178	read_passphrase("Enter new passphrase (empty for no passphrase): ", 1);
	179	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	180
	181	/* Verify that they are the same. */
	182	if (strcmp(passphrase1, passphrase2) != 0) {
	183	memset(passphrase1, 0, strlen(passphrase1));
	184	memset(passphrase2, 0, strlen(passphrase2));
	185	xfree(passphrase1);
	186	xfree(passphrase2);
	187	printf("Pass phrases do not match. Try again.\n");
	188	exit(1);
	189	}
	190	/* Destroy the other copy. */
	191	memset(passphrase2, 0, strlen(passphrase2));
	192	xfree(passphrase2);
8efc0c15	193	}
8efc0c15	194
5260325f	195	/* Save the file using the new passphrase. */
	196	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	197	printf("Saving the key failed: %s: %s.\n",
	198	identity_file, strerror(errno));
	199	memset(passphrase1, 0, strlen(passphrase1));
	200	xfree(passphrase1);
	201	RSA_free(private_key);
	202	xfree(comment);
	203	exit(1);
	204	}
	205	/* Destroy the passphrase and the copy of the key in memory. */
	206	memset(passphrase1, 0, strlen(passphrase1));
	207	xfree(passphrase1);
	208	RSA_free(private_key); /* Destroys contents */
	209	xfree(comment);
	210
	211	printf("Your identification has been saved with the new passphrase.\n");
	212	exit(0);
	213	}
8efc0c15	214
5260325f	215	/*
	216	* Change the comment of a private key file.
	217	*/
8efc0c15	218	void
	219	do_change_comment(struct passwd *pw)
	220	{
5260325f	221	char new_comment[1024], *comment;
	222	RSA *private_key;
	223	char *passphrase;
	224	struct stat st;
	225	FILE *f;
	226	char *tmpbuf;
	227
	228	if (!have_identity)
	229	ask_filename(pw, "Enter file in which the key is");
5260325f	230	if (stat(identity_file, &st) < 0) {
	231	perror(identity_file);
	232	exit(1);
	233	}
aa3378df	234	/*
	235	* Try to load the public key from the file the verify that it is
	236	* readable and of the proper format.
	237	*/
5260325f	238	public_key = RSA_new();
	239	if (!load_public_key(identity_file, public_key, NULL)) {
	240	printf("%s is not a valid key file.\n", identity_file);
	241	exit(1);
8efc0c15	242	}
5260325f	243	private_key = RSA_new();
aa3378df	244
5260325f	245	if (load_private_key(identity_file, "", private_key, &comment))
	246	passphrase = xstrdup("");
	247	else {
5260325f	248	if (identity_passphrase)
	249	passphrase = xstrdup(identity_passphrase);
	250	else if (identity_new_passphrase)
	251	passphrase = xstrdup(identity_new_passphrase);
	252	else
	253	passphrase = read_passphrase("Enter passphrase: ", 1);
	254	/* Try to load using the passphrase. */
	255	if (!load_private_key(identity_file, passphrase, private_key, &comment)) {
	256	memset(passphrase, 0, strlen(passphrase));
	257	xfree(passphrase);
	258	printf("Bad passphrase.\n");
	259	exit(1);
	260	}
	261	}
	262	printf("Key now has comment '%s'\n", comment);
	263
	264	if (identity_comment) {
	265	strlcpy(new_comment, identity_comment, sizeof(new_comment));
	266	} else {
	267	printf("Enter new comment: ");
	268	fflush(stdout);
	269	if (!fgets(new_comment, sizeof(new_comment), stdin)) {
	270	memset(passphrase, 0, strlen(passphrase));
	271	RSA_free(private_key);
	272	exit(1);
	273	}
5260325f	274	if (strchr(new_comment, '\n'))
	275	*strchr(new_comment, '\n') = 0;
	276	}
	277
	278	/* Save the file using the new passphrase. */
	279	if (!save_private_key(identity_file, passphrase, private_key, new_comment)) {
	280	printf("Saving the key failed: %s: %s.\n",
	281	identity_file, strerror(errno));
	282	memset(passphrase, 0, strlen(passphrase));
	283	xfree(passphrase);
	284	RSA_free(private_key);
	285	xfree(comment);
	286	exit(1);
8efc0c15	287	}
5260325f	288	memset(passphrase, 0, strlen(passphrase));
	289	xfree(passphrase);
	290	RSA_free(private_key);
	291
5260325f	292	strlcat(identity_file, ".pub", sizeof(identity_file));
	293	f = fopen(identity_file, "w");
	294	if (!f) {
	295	printf("Could not save your public key in %s\n", identity_file);
	296	exit(1);
	297	}
	298	fprintf(f, "%d ", BN_num_bits(public_key->n));
	299	tmpbuf = BN_bn2dec(public_key->e);
	300	fprintf(f, "%s ", tmpbuf);
	301	free(tmpbuf);
	302	tmpbuf = BN_bn2dec(public_key->n);
	303	fprintf(f, "%s %s\n", tmpbuf, new_comment);
	304	free(tmpbuf);
	305	fclose(f);
	306
	307	xfree(comment);
	308
	309	printf("The comment in your key file has been changed.\n");
	310	exit(0);
8efc0c15	311	}
8efc0c15	312
5ad13cd7	313	void
	314	usage(void)
	315	{
5260325f	316	printf("ssh-keygen version %s\n", SSH_VERSION);
	317	printf("Usage: %s [-b bits] [-p] [-c] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname);
	318	exit(1);
5ad13cd7	319	}
5ad13cd7	320
5260325f	321	/*
	322	* Main program for key management.
	323	*/
8efc0c15	324	int
	325	main(int ac, char **av)
	326	{
5260325f	327	char dotsshdir[16 * 1024], comment[1024], passphrase1, passphrase2;
	328	struct passwd *pw;
	329	char *tmpbuf;
	330	int opt;
	331	struct stat st;
	332	FILE *f;
	333	char hostname[MAXHOSTNAMELEN];
	334	extern int optind;
	335	extern char *optarg;
	336
	337	/* check if RSA support exists */
	338	if (rsa_alive() == 0) {
5260325f	339	fprintf(stderr,
	340	"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
	341	__progname);
	342	exit(1);
8efc0c15	343	}
aa3378df	344	/* we need this for the home * directory. */
5260325f	345	pw = getpwuid(getuid());
	346	if (!pw) {
	347	printf("You don't exist, go away!\n");
	348	exit(1);
	349	}
aa3378df	350
5260325f	351	while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) {
	352	switch (opt) {
	353	case 'b':
	354	bits = atoi(optarg);
	355	if (bits < 512 \|\| bits > 32768) {
	356	printf("Bits has bad value.\n");
	357	exit(1);
	358	}
	359	break;
	360
	361	case 'l':
	362	print_fingerprint = 1;
	363	break;
	364
	365	case 'p':
	366	change_passphrase = 1;
	367	break;
	368
	369	case 'c':
	370	change_comment = 1;
	371	break;
	372
	373	case 'f':
	374	strlcpy(identity_file, optarg, sizeof(identity_file));
	375	have_identity = 1;
	376	break;
	377
	378	case 'P':
	379	identity_passphrase = optarg;
	380	break;
	381
	382	case 'N':
	383	identity_new_passphrase = optarg;
	384	break;
	385
	386	case 'C':
	387	identity_comment = optarg;
	388	break;
	389
	390	case 'q':
	391	quiet = 1;
	392	break;
	393
	394	case '?':
	395	default:
	396	usage();
	397	}
	398	}
	399	if (optind < ac) {
	400	printf("Too many arguments.\n");
	401	usage();
	402	}
	403	if (change_passphrase && change_comment) {
	404	printf("Can only have one of -p and -c.\n");
	405	usage();
	406	}
	407	if (print_fingerprint)
	408	do_fingerprint(pw);
5260325f	409	if (change_passphrase)
5260325f	410	do_change_passphrase(pw);
5260325f	411	if (change_comment)
	412	do_change_comment(pw);
	413
	414	arc4random_stir();
	415
	416	if (quiet)
	417	rsa_set_verbose(0);
	418
	419	/* Generate the rsa key pair. */
	420	private_key = RSA_new();
	421	public_key = RSA_new();
	422	rsa_generate_key(private_key, public_key, bits);
	423
	424	if (!have_identity)
	425	ask_filename(pw, "Enter file in which to save the key");
	426
	427	/* Create ~/.ssh directory if it doesn\'t already exist. */
	428	snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR);
	429	if (strstr(identity_file, dotsshdir) != NULL &&
	430	stat(dotsshdir, &st) < 0) {
	431	if (mkdir(dotsshdir, 0755) < 0)
	432	error("Could not create directory '%s'.", dotsshdir);
	433	else if (!quiet)
	434	printf("Created directory '%s'.\n", dotsshdir);
	435	}
	436	/* If the file already exists, ask the user to confirm. */
	437	if (stat(identity_file, &st) >= 0) {
	438	char yesno[3];
	439	printf("%s already exists.\n", identity_file);
	440	printf("Overwrite (y/n)? ");
	441	fflush(stdout);
	442	if (fgets(yesno, sizeof(yesno), stdin) == NULL)
	443	exit(1);
	444	if (yesno[0] != 'y' && yesno[0] != 'Y')
	445	exit(1);
	446	}
	447	/* Ask for a passphrase (twice). */
	448	if (identity_passphrase)
	449	passphrase1 = xstrdup(identity_passphrase);
	450	else if (identity_new_passphrase)
	451	passphrase1 = xstrdup(identity_new_passphrase);
	452	else {
	453	passphrase_again:
	454	passphrase1 =
	455	read_passphrase("Enter passphrase (empty for no passphrase): ", 1);
	456	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	457	if (strcmp(passphrase1, passphrase2) != 0) {
	458	/* The passphrases do not match. Clear them and retry. */
	459	memset(passphrase1, 0, strlen(passphrase1));
	460	memset(passphrase2, 0, strlen(passphrase2));
	461	xfree(passphrase1);
	462	xfree(passphrase2);
	463	printf("Passphrases do not match. Try again.\n");
	464	goto passphrase_again;
	465	}
	466	/* Clear the other copy of the passphrase. */
	467	memset(passphrase2, 0, strlen(passphrase2));
	468	xfree(passphrase2);
	469	}
	470
5260325f	471	if (identity_comment) {
	472	strlcpy(comment, identity_comment, sizeof(comment));
	473	} else {
aa3378df	474	/* Create default commend field for the passphrase. */
5260325f	475	if (gethostname(hostname, sizeof(hostname)) < 0) {
	476	perror("gethostname");
	477	exit(1);
	478	}
	479	snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
	480	}
	481
	482	/* Save the key with the given passphrase and comment. */
	483	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	484	printf("Saving the key failed: %s: %s.\n",
	485	identity_file, strerror(errno));
	486	memset(passphrase1, 0, strlen(passphrase1));
	487	xfree(passphrase1);
	488	exit(1);
	489	}
	490	/* Clear the passphrase. */
	491	memset(passphrase1, 0, strlen(passphrase1));
	492	xfree(passphrase1);
	493
	494	/* Clear the private key and the random number generator. */
	495	RSA_free(private_key);
	496	arc4random_stir();
	497
	498	if (!quiet)
	499	printf("Your identification has been saved in %s.\n", identity_file);
	500
5260325f	501	strlcat(identity_file, ".pub", sizeof(identity_file));
	502	f = fopen(identity_file, "w");
	503	if (!f) {
	504	printf("Could not save your public key in %s\n", identity_file);
	505	exit(1);
	506	}
	507	fprintf(f, "%d ", BN_num_bits(public_key->n));
	508	tmpbuf = BN_bn2dec(public_key->e);
	509	fprintf(f, "%s ", tmpbuf);
	510	free(tmpbuf);
	511	tmpbuf = BN_bn2dec(public_key->n);
	512	fprintf(f, "%s %s\n", tmpbuf, comment);
	513	free(tmpbuf);
	514	fclose(f);
	515
	516	if (!quiet) {
	517	printf("Your public key has been saved in %s.\n", identity_file);
	518	printf("The key fingerprint is:\n");
	519	printf("%d %s %s\n", BN_num_bits(public_key->n),
	520	fingerprint(public_key->e, public_key->n),
	521	comment);
8efc0c15	522	}
5260325f	523	exit(0);
8efc0c15	524	}