[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;
	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);
}
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;
610cd5c6	88	unsigned int ignore;
5260325f	89	struct stat st;
	90
	91	if (!have_identity)
	92	ask_filename(pw, "Enter file in which the key is");
	93	if (stat(identity_file, &st) < 0) {
	94	perror(identity_file);
	95	exit(1);
	96	}
c8d54615	97
5260325f	98	public_key = RSA_new();
c8d54615	99	if (load_public_key(identity_file, public_key, &comment)) {
	100	printf("%d %s %s\n", BN_num_bits(public_key->n),
	101	fingerprint(public_key->e, public_key->n),
	102	comment);
	103	RSA_free(public_key);
	104	exit(0);
	105	}
	106	RSA_free(public_key);
	107
	108	f = fopen(identity_file, "r");
	109	if (f != NULL) {
5260325f	110	n = BN_new();
5260325f	111	e = BN_new();
c8d54615	112	while (fgets(line, sizeof(line), f)) {
	113	i = strlen(line) - 1;
	114	if (line[i] != '\n') {
	115	error("line %d too long: %.40s...", num, line);
	116	skip = 1;
	117	continue;
	118	}
	119	num++;
	120	if (skip) {
	121	skip = 0;
	122	continue;
	123	}
	124	line[i] = '\0';
	125
	126	/* Skip leading whitespace, empty and comment lines. */
	127	for (cp = line; cp == ' ' \|\| cp == '\t'; cp++)
	128	;
	129	if (!cp \|\| cp == '\n' \|\| *cp == '#')
	130	continue ;
	131	i = strtol(cp, &ep, 10);
	132	if (i == 0 \|\| ep == NULL \|\| (ep != ' ' && ep != '\t')) {
	133	int quoted = 0;
	134	comment = cp;
	135	for (; cp && (quoted \|\| (cp != ' ' && *cp != '\t')); cp++) {
	136	if (*cp == '\\' && cp[1] == '"')
	137	cp++; /* Skip both */
	138	else if (*cp == '"')
	139	quoted = !quoted;
	140	}
	141	if (!*cp)
	142	continue;
	143	*cp++ = '\0';
	144	}
	145	ep = cp;
610cd5c6	146	if (auth_rsa_read_key(&cp, &ignore, e, n)) {
c8d54615	147	invalid = 0;
	148	comment = *cp ? cp : comment;
	149	printf("%d %s %s\n", BN_num_bits(n),
	150	fingerprint(e, n),
	151	comment ? comment : "no comment");
5260325f	152	}
5260325f	153	}
c8d54615	154	BN_free(e);
	155	BN_free(n);
	156	fclose(f);
	157	}
	158	if (invalid) {
	159	printf("%s is not a valid key file.\n", identity_file);
	160	exit(1);
5260325f	161	}
5260325f	162	exit(0);
f095fcc7	163	}
f095fcc7	164
5260325f	165	/*
	166	* Perform changing a passphrase. The argument is the passwd structure
	167	* for the current user.
	168	*/
f095fcc7	169	void
	170	do_change_passphrase(struct passwd *pw)
	171	{
5260325f	172	char *comment;
	173	char old_passphrase, passphrase1, *passphrase2;
	174	struct stat st;
	175	RSA *private_key;
	176
	177	if (!have_identity)
	178	ask_filename(pw, "Enter file in which the key is");
5260325f	179	if (stat(identity_file, &st) < 0) {
	180	perror(identity_file);
	181	exit(1);
	182	}
5260325f	183	public_key = RSA_new();
	184	if (!load_public_key(identity_file, public_key, NULL)) {
	185	printf("%s is not a valid key file.\n", identity_file);
	186	exit(1);
	187	}
	188	/* Clear the public key since we are just about to load the whole file. */
	189	RSA_free(public_key);
	190
	191	/* Try to load the file with empty passphrase. */
	192	private_key = RSA_new();
	193	if (!load_private_key(identity_file, "", private_key, &comment)) {
5260325f	194	if (identity_passphrase)
	195	old_passphrase = xstrdup(identity_passphrase);
	196	else
	197	old_passphrase = read_passphrase("Enter old passphrase: ", 1);
5260325f	198	if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) {
	199	memset(old_passphrase, 0, strlen(old_passphrase));
	200	xfree(old_passphrase);
	201	printf("Bad passphrase.\n");
	202	exit(1);
	203	}
5260325f	204	memset(old_passphrase, 0, strlen(old_passphrase));
	205	xfree(old_passphrase);
	206	}
	207	printf("Key has comment '%s'\n", comment);
	208
	209	/* Ask the new passphrase (twice). */
	210	if (identity_new_passphrase) {
	211	passphrase1 = xstrdup(identity_new_passphrase);
	212	passphrase2 = NULL;
	213	} else {
	214	passphrase1 =
	215	read_passphrase("Enter new passphrase (empty for no passphrase): ", 1);
	216	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	217
	218	/* Verify that they are the same. */
	219	if (strcmp(passphrase1, passphrase2) != 0) {
	220	memset(passphrase1, 0, strlen(passphrase1));
	221	memset(passphrase2, 0, strlen(passphrase2));
	222	xfree(passphrase1);
	223	xfree(passphrase2);
	224	printf("Pass phrases do not match. Try again.\n");
	225	exit(1);
	226	}
	227	/* Destroy the other copy. */
	228	memset(passphrase2, 0, strlen(passphrase2));
	229	xfree(passphrase2);
8efc0c15	230	}
8efc0c15	231
5260325f	232	/* Save the file using the new passphrase. */
	233	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	234	printf("Saving the key failed: %s: %s.\n",
	235	identity_file, strerror(errno));
	236	memset(passphrase1, 0, strlen(passphrase1));
	237	xfree(passphrase1);
	238	RSA_free(private_key);
	239	xfree(comment);
	240	exit(1);
	241	}
	242	/* Destroy the passphrase and the copy of the key in memory. */
	243	memset(passphrase1, 0, strlen(passphrase1));
	244	xfree(passphrase1);
	245	RSA_free(private_key); /* Destroys contents */
	246	xfree(comment);
	247
	248	printf("Your identification has been saved with the new passphrase.\n");
	249	exit(0);
	250	}
8efc0c15	251
5260325f	252	/*
	253	* Change the comment of a private key file.
	254	*/
8efc0c15	255	void
	256	do_change_comment(struct passwd *pw)
	257	{
5260325f	258	char new_comment[1024], *comment;
	259	RSA *private_key;
	260	char *passphrase;
	261	struct stat st;
	262	FILE *f;
	263	char *tmpbuf;
	264
	265	if (!have_identity)
	266	ask_filename(pw, "Enter file in which the key is");
5260325f	267	if (stat(identity_file, &st) < 0) {
	268	perror(identity_file);
	269	exit(1);
	270	}
aa3378df	271	/*
	272	* Try to load the public key from the file the verify that it is
	273	* readable and of the proper format.
	274	*/
5260325f	275	public_key = RSA_new();
	276	if (!load_public_key(identity_file, public_key, NULL)) {
	277	printf("%s is not a valid key file.\n", identity_file);
	278	exit(1);
8efc0c15	279	}
5260325f	280	private_key = RSA_new();
aa3378df	281
5260325f	282	if (load_private_key(identity_file, "", private_key, &comment))
	283	passphrase = xstrdup("");
	284	else {
5260325f	285	if (identity_passphrase)
	286	passphrase = xstrdup(identity_passphrase);
	287	else if (identity_new_passphrase)
	288	passphrase = xstrdup(identity_new_passphrase);
	289	else
	290	passphrase = read_passphrase("Enter passphrase: ", 1);
	291	/* Try to load using the passphrase. */
	292	if (!load_private_key(identity_file, passphrase, private_key, &comment)) {
	293	memset(passphrase, 0, strlen(passphrase));
	294	xfree(passphrase);
	295	printf("Bad passphrase.\n");
	296	exit(1);
	297	}
	298	}
	299	printf("Key now has comment '%s'\n", comment);
	300
	301	if (identity_comment) {
	302	strlcpy(new_comment, identity_comment, sizeof(new_comment));
	303	} else {
	304	printf("Enter new comment: ");
	305	fflush(stdout);
	306	if (!fgets(new_comment, sizeof(new_comment), stdin)) {
	307	memset(passphrase, 0, strlen(passphrase));
	308	RSA_free(private_key);
	309	exit(1);
	310	}
5260325f	311	if (strchr(new_comment, '\n'))
	312	*strchr(new_comment, '\n') = 0;
	313	}
	314
	315	/* Save the file using the new passphrase. */
	316	if (!save_private_key(identity_file, passphrase, private_key, new_comment)) {
	317	printf("Saving the key failed: %s: %s.\n",
	318	identity_file, strerror(errno));
	319	memset(passphrase, 0, strlen(passphrase));
	320	xfree(passphrase);
	321	RSA_free(private_key);
	322	xfree(comment);
	323	exit(1);
8efc0c15	324	}
5260325f	325	memset(passphrase, 0, strlen(passphrase));
	326	xfree(passphrase);
	327	RSA_free(private_key);
	328
5260325f	329	strlcat(identity_file, ".pub", sizeof(identity_file));
	330	f = fopen(identity_file, "w");
	331	if (!f) {
	332	printf("Could not save your public key in %s\n", identity_file);
	333	exit(1);
	334	}
	335	fprintf(f, "%d ", BN_num_bits(public_key->n));
	336	tmpbuf = BN_bn2dec(public_key->e);
	337	fprintf(f, "%s ", tmpbuf);
	338	free(tmpbuf);
	339	tmpbuf = BN_bn2dec(public_key->n);
	340	fprintf(f, "%s %s\n", tmpbuf, new_comment);
	341	free(tmpbuf);
	342	fclose(f);
	343
	344	xfree(comment);
	345
	346	printf("The comment in your key file has been changed.\n");
	347	exit(0);
8efc0c15	348	}
8efc0c15	349
5ad13cd7	350	void
	351	usage(void)
	352	{
5260325f	353	printf("ssh-keygen version %s\n", SSH_VERSION);
c8d54615	354	printf("Usage: %s [-b bits] [-p] [-c] [-l] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname);
5260325f	355	exit(1);
5ad13cd7	356	}
5ad13cd7	357
5260325f	358	/*
	359	* Main program for key management.
	360	*/
8efc0c15	361	int
	362	main(int ac, char **av)
	363	{
5260325f	364	char dotsshdir[16 * 1024], comment[1024], passphrase1, passphrase2;
	365	struct passwd *pw;
	366	char *tmpbuf;
	367	int opt;
	368	struct stat st;
	369	FILE *f;
	370	char hostname[MAXHOSTNAMELEN];
	371	extern int optind;
	372	extern char *optarg;
	373
	374	/* check if RSA support exists */
	375	if (rsa_alive() == 0) {
5260325f	376	fprintf(stderr,
	377	"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
	378	__progname);
	379	exit(1);
8efc0c15	380	}
aa3378df	381	/* we need this for the home * directory. */
5260325f	382	pw = getpwuid(getuid());
	383	if (!pw) {
	384	printf("You don't exist, go away!\n");
	385	exit(1);
	386	}
aa3378df	387
5260325f	388	while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) {
	389	switch (opt) {
	390	case 'b':
	391	bits = atoi(optarg);
	392	if (bits < 512 \|\| bits > 32768) {
	393	printf("Bits has bad value.\n");
	394	exit(1);
	395	}
	396	break;
	397
	398	case 'l':
	399	print_fingerprint = 1;
	400	break;
	401
	402	case 'p':
	403	change_passphrase = 1;
	404	break;
	405
	406	case 'c':
	407	change_comment = 1;
	408	break;
	409
	410	case 'f':
	411	strlcpy(identity_file, optarg, sizeof(identity_file));
	412	have_identity = 1;
	413	break;
	414
	415	case 'P':
	416	identity_passphrase = optarg;
	417	break;
	418
	419	case 'N':
	420	identity_new_passphrase = optarg;
	421	break;
	422
	423	case 'C':
	424	identity_comment = optarg;
	425	break;
	426
	427	case 'q':
	428	quiet = 1;
	429	break;
	430
	431	case '?':
	432	default:
	433	usage();
	434	}
	435	}
	436	if (optind < ac) {
	437	printf("Too many arguments.\n");
	438	usage();
	439	}
	440	if (change_passphrase && change_comment) {
	441	printf("Can only have one of -p and -c.\n");
	442	usage();
	443	}
	444	if (print_fingerprint)
	445	do_fingerprint(pw);
5260325f	446	if (change_passphrase)
5260325f	447	do_change_passphrase(pw);
5260325f	448	if (change_comment)
	449	do_change_comment(pw);
	450
	451	arc4random_stir();
	452
	453	if (quiet)
	454	rsa_set_verbose(0);
	455
	456	/* Generate the rsa key pair. */
	457	private_key = RSA_new();
	458	public_key = RSA_new();
	459	rsa_generate_key(private_key, public_key, bits);
	460
	461	if (!have_identity)
	462	ask_filename(pw, "Enter file in which to save the key");
	463
	464	/* Create ~/.ssh directory if it doesn\'t already exist. */
	465	snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR);
	466	if (strstr(identity_file, dotsshdir) != NULL &&
	467	stat(dotsshdir, &st) < 0) {
	468	if (mkdir(dotsshdir, 0755) < 0)
	469	error("Could not create directory '%s'.", dotsshdir);
	470	else if (!quiet)
	471	printf("Created directory '%s'.\n", dotsshdir);
	472	}
	473	/* If the file already exists, ask the user to confirm. */
	474	if (stat(identity_file, &st) >= 0) {
	475	char yesno[3];
	476	printf("%s already exists.\n", identity_file);
	477	printf("Overwrite (y/n)? ");
	478	fflush(stdout);
	479	if (fgets(yesno, sizeof(yesno), stdin) == NULL)
	480	exit(1);
	481	if (yesno[0] != 'y' && yesno[0] != 'Y')
	482	exit(1);
	483	}
	484	/* Ask for a passphrase (twice). */
	485	if (identity_passphrase)
	486	passphrase1 = xstrdup(identity_passphrase);
	487	else if (identity_new_passphrase)
	488	passphrase1 = xstrdup(identity_new_passphrase);
	489	else {
	490	passphrase_again:
	491	passphrase1 =
	492	read_passphrase("Enter passphrase (empty for no passphrase): ", 1);
	493	passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
	494	if (strcmp(passphrase1, passphrase2) != 0) {
	495	/* The passphrases do not match. Clear them and retry. */
	496	memset(passphrase1, 0, strlen(passphrase1));
	497	memset(passphrase2, 0, strlen(passphrase2));
	498	xfree(passphrase1);
	499	xfree(passphrase2);
	500	printf("Passphrases do not match. Try again.\n");
	501	goto passphrase_again;
	502	}
	503	/* Clear the other copy of the passphrase. */
	504	memset(passphrase2, 0, strlen(passphrase2));
	505	xfree(passphrase2);
	506	}
	507
5260325f	508	if (identity_comment) {
	509	strlcpy(comment, identity_comment, sizeof(comment));
	510	} else {
aa3378df	511	/* Create default commend field for the passphrase. */
5260325f	512	if (gethostname(hostname, sizeof(hostname)) < 0) {
	513	perror("gethostname");
	514	exit(1);
	515	}
	516	snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
	517	}
	518
	519	/* Save the key with the given passphrase and comment. */
	520	if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
	521	printf("Saving the key failed: %s: %s.\n",
	522	identity_file, strerror(errno));
	523	memset(passphrase1, 0, strlen(passphrase1));
	524	xfree(passphrase1);
	525	exit(1);
	526	}
	527	/* Clear the passphrase. */
	528	memset(passphrase1, 0, strlen(passphrase1));
	529	xfree(passphrase1);
	530
	531	/* Clear the private key and the random number generator. */
	532	RSA_free(private_key);
	533	arc4random_stir();
	534
	535	if (!quiet)
	536	printf("Your identification has been saved in %s.\n", identity_file);
	537
5260325f	538	strlcat(identity_file, ".pub", sizeof(identity_file));
	539	f = fopen(identity_file, "w");
	540	if (!f) {
	541	printf("Could not save your public key in %s\n", identity_file);
	542	exit(1);
	543	}
	544	fprintf(f, "%d ", BN_num_bits(public_key->n));
	545	tmpbuf = BN_bn2dec(public_key->e);
	546	fprintf(f, "%s ", tmpbuf);
	547	free(tmpbuf);
	548	tmpbuf = BN_bn2dec(public_key->n);
	549	fprintf(f, "%s %s\n", tmpbuf, comment);
	550	free(tmpbuf);
	551	fclose(f);
	552
	553	if (!quiet) {
	554	printf("Your public key has been saved in %s.\n", identity_file);
	555	printf("The key fingerprint is:\n");
	556	printf("%d %s %s\n", BN_num_bits(public_key->n),
	557	fingerprint(public_key->e, public_key->n),
	558	comment);
8efc0c15	559	}
5260325f	560	exit(0);
8efc0c15	561	}