[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)
{
	FILE *f;
	BIGNUM *e, *n;
	RSA *public_key;
	char *comment = NULL, *cp, *ep, line[16*1024];
	int i, skip = 0, num = 1, invalid = 1;
	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, &i, 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);
}
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	{
c8d54615	83	FILE *f;
c8d54615	84	BIGNUM e, n;
5260325f	85	RSA *public_key;
c8d54615	86	char comment = NULL, cp, ep, line[161024];
c8d54615	87	int i, skip = 0, num = 1, invalid = 1;
5260325f	88	struct stat st;
	89
	90	if (!have_identity)
	91	ask_filename(pw, "Enter file in which the key is");
	92	if (stat(identity_file, &st) < 0) {
	93	perror(identity_file);
	94	exit(1);
	95	}
c8d54615	96
5260325f	97	public_key = RSA_new();
c8d54615	98	if (load_public_key(identity_file, public_key, &comment)) {
	99	printf("%d %s %s\n", BN_num_bits(public_key->n),
	100	fingerprint(public_key->e, public_key->n),
	101	comment);
	102	RSA_free(public_key);
	103	exit(0);
	104	}
	105	RSA_free(public_key);
	106
	107	f = fopen(identity_file, "r");
	108	if (f != NULL) {
5260325f	109	n = BN_new();
5260325f	110	e = BN_new();
c8d54615	111	while (fgets(line, sizeof(line), f)) {
	112	i = strlen(line) - 1;
	113	if (line[i] != '\n') {
	114	error("line %d too long: %.40s...", num, line);
	115	skip = 1;
	116	continue;
	117	}
	118	num++;
	119	if (skip) {
	120	skip = 0;
	121	continue;
	122	}
	123	line[i] = '\0';
	124
	125	/* Skip leading whitespace, empty and comment lines. */
	126	for (cp = line; cp == ' ' \|\| cp == '\t'; cp++)
	127	;
	128	if (!cp \|\| cp == '\n' \|\| *cp == '#')
	129	continue ;
	130	i = strtol(cp, &ep, 10);
	131	if (i == 0 \|\| ep == NULL \|\| (ep != ' ' && ep != '\t')) {
	132	int quoted = 0;
	133	comment = cp;
	134	for (; cp && (quoted \|\| (cp != ' ' && *cp != '\t')); cp++) {
	135	if (*cp == '\\' && cp[1] == '"')
	136	cp++; /* Skip both */
	137	else if (*cp == '"')
	138	quoted = !quoted;
	139	}
	140	if (!*cp)
	141	continue;
	142	*cp++ = '\0';
	143	}
	144	ep = cp;
	145	if (auth_rsa_read_key(&cp, &i, e, n)) {
	146	invalid = 0;
	147	comment = *cp ? cp : comment;
	148	printf("%d %s %s\n", BN_num_bits(n),
	149	fingerprint(e, n),
	150	comment ? comment : "no comment");
5260325f	151	}
5260325f	152	}
c8d54615	153	BN_free(e);
	154	BN_free(n);
	155	fclose(f);
	156	}
	157	if (invalid) {
	158	printf("%s is not a valid key file.\n", identity_file);
	159	exit(1);
5260325f	160	}
5260325f	161	exit(0);
f095fcc7	162	}
f095fcc7	163
5260325f	164	/*
	165	* Perform changing a passphrase. The argument is the passwd structure
	166	* for the current user.
	167	*/
f095fcc7	168	void
	169	do_change_passphrase(struct passwd *pw)
	170	{
5260325f	171	char *comment;
	172	char old_passphrase, passphrase1, *passphrase2;
	173	struct stat st;
	174	RSA *private_key;
	175
	176	if (!have_identity)
	177	ask_filename(pw, "Enter file in which the key is");
5260325f	178	if (stat(identity_file, &st) < 0) {
	179	perror(identity_file);
	180	exit(1);
	181	}
5260325f	182	public_key = RSA_new();
	183	if (!load_public_key(identity_file, public_key, NULL)) {
	184	printf("%s is not a valid key file.\n", identity_file);
	185	exit(1);
	186	}
	187	/* Clear the public key since we are just about to load the whole file. */
	188	RSA_free(public_key);
	189
	190	/* Try to load the file with empty passphrase. */
	191	private_key = RSA_new();
	192	if (!load_private_key(identity_file, "", private_key, &comment)) {
5260325f	193	if (identity_passphrase)
	194	old_passphrase = xstrdup(identity_passphrase);
	195	else
	196	old_passphrase = read_passphrase("Enter old passphrase: ", 1);
5260325f	197	if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) {
	198	memset(old_passphrase, 0, strlen(old_passphrase));
	199	xfree(old_passphrase);
	200	printf("Bad passphrase.\n");
	201	exit(1);
	202	}
5260325f	203	memset(old_passphrase, 0, strlen(old_passphrase));
	204	xfree(old_passphrase);
	205	}
	206	printf("Key has comment '%s'\n", comment);
	207
	208	/* Ask the new passphrase (twice). */
	209	if (identity_new_passphrase) {
	210	passphrase1 = xstrdup(identity_new_passphrase);
	211	passphrase2 = NULL;
	212	} else {
	213	passphrase1 =
	214	read_passphrase("Enter new passphrase (empty for no passphrase): ", 1);
	215	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	216
	217	/* Verify that they are the same. */
	218	if (strcmp(passphrase1, passphrase2) != 0) {
	219	memset(passphrase1, 0, strlen(passphrase1));
	220	memset(passphrase2, 0, strlen(passphrase2));
	221	xfree(passphrase1);
	222	xfree(passphrase2);
	223	printf("Pass phrases do not match. Try again.\n");
	224	exit(1);
	225	}
	226	/* Destroy the other copy. */
	227	memset(passphrase2, 0, strlen(passphrase2));
	228	xfree(passphrase2);
8efc0c15	229	}
8efc0c15	230
5260325f	231	/* Save the file using the new passphrase. */
	232	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	233	printf("Saving the key failed: %s: %s.\n",
	234	identity_file, strerror(errno));
	235	memset(passphrase1, 0, strlen(passphrase1));
	236	xfree(passphrase1);
	237	RSA_free(private_key);
	238	xfree(comment);
	239	exit(1);
	240	}
	241	/* Destroy the passphrase and the copy of the key in memory. */
	242	memset(passphrase1, 0, strlen(passphrase1));
	243	xfree(passphrase1);
	244	RSA_free(private_key); /* Destroys contents */
	245	xfree(comment);
	246
	247	printf("Your identification has been saved with the new passphrase.\n");
	248	exit(0);
	249	}
8efc0c15	250
5260325f	251	/*
	252	* Change the comment of a private key file.
	253	*/
8efc0c15	254	void
	255	do_change_comment(struct passwd *pw)
	256	{
5260325f	257	char new_comment[1024], *comment;
	258	RSA *private_key;
	259	char *passphrase;
	260	struct stat st;
	261	FILE *f;
	262	char *tmpbuf;
	263
	264	if (!have_identity)
	265	ask_filename(pw, "Enter file in which the key is");
5260325f	266	if (stat(identity_file, &st) < 0) {
	267	perror(identity_file);
	268	exit(1);
	269	}
aa3378df	270	/*
	271	* Try to load the public key from the file the verify that it is
	272	* readable and of the proper format.
	273	*/
5260325f	274	public_key = RSA_new();
	275	if (!load_public_key(identity_file, public_key, NULL)) {
	276	printf("%s is not a valid key file.\n", identity_file);
	277	exit(1);
8efc0c15	278	}
5260325f	279	private_key = RSA_new();
aa3378df	280
5260325f	281	if (load_private_key(identity_file, "", private_key, &comment))
	282	passphrase = xstrdup("");
	283	else {
5260325f	284	if (identity_passphrase)
	285	passphrase = xstrdup(identity_passphrase);
	286	else if (identity_new_passphrase)
	287	passphrase = xstrdup(identity_new_passphrase);
	288	else
	289	passphrase = read_passphrase("Enter passphrase: ", 1);
	290	/* Try to load using the passphrase. */
	291	if (!load_private_key(identity_file, passphrase, private_key, &comment)) {
	292	memset(passphrase, 0, strlen(passphrase));
	293	xfree(passphrase);
	294	printf("Bad passphrase.\n");
	295	exit(1);
	296	}
	297	}
	298	printf("Key now has comment '%s'\n", comment);
	299
	300	if (identity_comment) {
	301	strlcpy(new_comment, identity_comment, sizeof(new_comment));
	302	} else {
	303	printf("Enter new comment: ");
	304	fflush(stdout);
	305	if (!fgets(new_comment, sizeof(new_comment), stdin)) {
	306	memset(passphrase, 0, strlen(passphrase));
	307	RSA_free(private_key);
	308	exit(1);
	309	}
5260325f	310	if (strchr(new_comment, '\n'))
	311	*strchr(new_comment, '\n') = 0;
	312	}
	313
	314	/* Save the file using the new passphrase. */
	315	if (!save_private_key(identity_file, passphrase, private_key, new_comment)) {
	316	printf("Saving the key failed: %s: %s.\n",
	317	identity_file, strerror(errno));
	318	memset(passphrase, 0, strlen(passphrase));
	319	xfree(passphrase);
	320	RSA_free(private_key);
	321	xfree(comment);
	322	exit(1);
8efc0c15	323	}
5260325f	324	memset(passphrase, 0, strlen(passphrase));
	325	xfree(passphrase);
	326	RSA_free(private_key);
	327
5260325f	328	strlcat(identity_file, ".pub", sizeof(identity_file));
	329	f = fopen(identity_file, "w");
	330	if (!f) {
	331	printf("Could not save your public key in %s\n", identity_file);
	332	exit(1);
	333	}
	334	fprintf(f, "%d ", BN_num_bits(public_key->n));
	335	tmpbuf = BN_bn2dec(public_key->e);
	336	fprintf(f, "%s ", tmpbuf);
	337	free(tmpbuf);
	338	tmpbuf = BN_bn2dec(public_key->n);
	339	fprintf(f, "%s %s\n", tmpbuf, new_comment);
	340	free(tmpbuf);
	341	fclose(f);
	342
	343	xfree(comment);
	344
	345	printf("The comment in your key file has been changed.\n");
	346	exit(0);
8efc0c15	347	}
8efc0c15	348
5ad13cd7	349	void
	350	usage(void)
	351	{
5260325f	352	printf("ssh-keygen version %s\n", SSH_VERSION);
c8d54615	353	printf("Usage: %s [-b bits] [-p] [-c] [-l] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname);
5260325f	354	exit(1);
5ad13cd7	355	}
5ad13cd7	356
5260325f	357	/*
	358	* Main program for key management.
	359	*/
8efc0c15	360	int
	361	main(int ac, char **av)
	362	{
5260325f	363	char dotsshdir[16 * 1024], comment[1024], passphrase1, passphrase2;
	364	struct passwd *pw;
	365	char *tmpbuf;
	366	int opt;
	367	struct stat st;
	368	FILE *f;
	369	char hostname[MAXHOSTNAMELEN];
	370	extern int optind;
	371	extern char *optarg;
	372
	373	/* check if RSA support exists */
	374	if (rsa_alive() == 0) {
5260325f	375	fprintf(stderr,
	376	"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
	377	__progname);
	378	exit(1);
8efc0c15	379	}
aa3378df	380	/* we need this for the home * directory. */
5260325f	381	pw = getpwuid(getuid());
	382	if (!pw) {
	383	printf("You don't exist, go away!\n");
	384	exit(1);
	385	}
aa3378df	386
5260325f	387	while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) {
	388	switch (opt) {
	389	case 'b':
	390	bits = atoi(optarg);
	391	if (bits < 512 \|\| bits > 32768) {
	392	printf("Bits has bad value.\n");
	393	exit(1);
	394	}
	395	break;
	396
	397	case 'l':
	398	print_fingerprint = 1;
	399	break;
	400
	401	case 'p':
	402	change_passphrase = 1;
	403	break;
	404
	405	case 'c':
	406	change_comment = 1;
	407	break;
	408
	409	case 'f':
	410	strlcpy(identity_file, optarg, sizeof(identity_file));
	411	have_identity = 1;
	412	break;
	413
	414	case 'P':
	415	identity_passphrase = optarg;
	416	break;
	417
	418	case 'N':
	419	identity_new_passphrase = optarg;
	420	break;
	421
	422	case 'C':
	423	identity_comment = optarg;
	424	break;
	425
	426	case 'q':
	427	quiet = 1;
	428	break;
	429
	430	case '?':
	431	default:
	432	usage();
	433	}
	434	}
	435	if (optind < ac) {
	436	printf("Too many arguments.\n");
	437	usage();
	438	}
	439	if (change_passphrase && change_comment) {
	440	printf("Can only have one of -p and -c.\n");
	441	usage();
	442	}
	443	if (print_fingerprint)
	444	do_fingerprint(pw);
5260325f	445	if (change_passphrase)
5260325f	446	do_change_passphrase(pw);
5260325f	447	if (change_comment)
	448	do_change_comment(pw);
	449
	450	arc4random_stir();
	451
	452	if (quiet)
	453	rsa_set_verbose(0);
	454
	455	/* Generate the rsa key pair. */
	456	private_key = RSA_new();
	457	public_key = RSA_new();
	458	rsa_generate_key(private_key, public_key, bits);
	459
	460	if (!have_identity)
	461	ask_filename(pw, "Enter file in which to save the key");
	462
	463	/* Create ~/.ssh directory if it doesn\'t already exist. */
	464	snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR);
	465	if (strstr(identity_file, dotsshdir) != NULL &&
	466	stat(dotsshdir, &st) < 0) {
	467	if (mkdir(dotsshdir, 0755) < 0)
	468	error("Could not create directory '%s'.", dotsshdir);
	469	else if (!quiet)
	470	printf("Created directory '%s'.\n", dotsshdir);
	471	}
	472	/* If the file already exists, ask the user to confirm. */
	473	if (stat(identity_file, &st) >= 0) {
	474	char yesno[3];
	475	printf("%s already exists.\n", identity_file);
	476	printf("Overwrite (y/n)? ");
	477	fflush(stdout);
	478	if (fgets(yesno, sizeof(yesno), stdin) == NULL)
	479	exit(1);
	480	if (yesno[0] != 'y' && yesno[0] != 'Y')
	481	exit(1);
	482	}
	483	/* Ask for a passphrase (twice). */
	484	if (identity_passphrase)
	485	passphrase1 = xstrdup(identity_passphrase);
	486	else if (identity_new_passphrase)
	487	passphrase1 = xstrdup(identity_new_passphrase);
	488	else {
	489	passphrase_again:
	490	passphrase1 =
	491	read_passphrase("Enter passphrase (empty for no passphrase): ", 1);
	492	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	493	if (strcmp(passphrase1, passphrase2) != 0) {
	494	/* The passphrases do not match. Clear them and retry. */
	495	memset(passphrase1, 0, strlen(passphrase1));
	496	memset(passphrase2, 0, strlen(passphrase2));
	497	xfree(passphrase1);
	498	xfree(passphrase2);
	499	printf("Passphrases do not match. Try again.\n");
	500	goto passphrase_again;
	501	}
	502	/* Clear the other copy of the passphrase. */
	503	memset(passphrase2, 0, strlen(passphrase2));
	504	xfree(passphrase2);
	505	}
	506
5260325f	507	if (identity_comment) {
	508	strlcpy(comment, identity_comment, sizeof(comment));
	509	} else {
aa3378df	510	/* Create default commend field for the passphrase. */
5260325f	511	if (gethostname(hostname, sizeof(hostname)) < 0) {
	512	perror("gethostname");
	513	exit(1);
	514	}
	515	snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
	516	}
	517
	518	/* Save the key with the given passphrase and comment. */
	519	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	520	printf("Saving the key failed: %s: %s.\n",
	521	identity_file, strerror(errno));
	522	memset(passphrase1, 0, strlen(passphrase1));
	523	xfree(passphrase1);
	524	exit(1);
	525	}
	526	/* Clear the passphrase. */
	527	memset(passphrase1, 0, strlen(passphrase1));
	528	xfree(passphrase1);
	529
	530	/* Clear the private key and the random number generator. */
	531	RSA_free(private_key);
	532	arc4random_stir();
	533
	534	if (!quiet)
	535	printf("Your identification has been saved in %s.\n", identity_file);
	536
5260325f	537	strlcat(identity_file, ".pub", sizeof(identity_file));
	538	f = fopen(identity_file, "w");
	539	if (!f) {
	540	printf("Could not save your public key in %s\n", identity_file);
	541	exit(1);
	542	}
	543	fprintf(f, "%d ", BN_num_bits(public_key->n));
	544	tmpbuf = BN_bn2dec(public_key->e);
	545	fprintf(f, "%s ", tmpbuf);
	546	free(tmpbuf);
	547	tmpbuf = BN_bn2dec(public_key->n);
	548	fprintf(f, "%s %s\n", tmpbuf, comment);
	549	free(tmpbuf);
	550	fclose(f);
	551
	552	if (!quiet) {
	553	printf("Your public key has been saved in %s.\n", identity_file);
	554	printf("The key fingerprint is:\n");
	555	printf("%d %s %s\n", BN_num_bits(public_key->n),
	556	fingerprint(public_key->e, public_key->n),
	557	comment);
8efc0c15	558	}
5260325f	559	exit(0);
8efc0c15	560	}