OpenSolaris Launch

1 files changed, 1037 insertions, 0 deletions

diff --git a/usr/src/cmd/ssh/ssh-keygen/ssh-keygen.c b/usr/src/cmd/ssh/ssh-keygen/ssh-keygen.c
new file mode 100644
index 0000000000..50284e08b7
--- /dev/null
+++ b/usr/src/cmd/ssh/ssh-keygen/ssh-keygen.c
@@ -0,0 +1,1037 @@
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * Identity and host key generation and maintenance.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: ssh-keygen.c,v 1.101 2002/06/23 09:39:55 deraadt Exp $");
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <openssl/evp.h>
+#include <openssl/pem.h>
+
+#include "xmalloc.h"
+#include "key.h"
+#include "rsa.h"
+#include "authfile.h"
+#include "uuencode.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "pathnames.h"
+#include "log.h"
+#include "readpass.h"
+#include <langinfo.h>
+
+#ifdef SMARTCARD
+#include "scard.h"
+#endif
+
+/* Number of bits in the RSA/DSA 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;
+int print_bubblebabble = 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;
+
+/* Dump public key file in format used by real and the original SSH 2 */
+int convert_to_ssh2 = 0;
+int convert_from_ssh2 = 0;
+int print_public = 0;
+
+char *key_type_name = NULL;
+
+/* argv0 */
+#ifdef HAVE___PROGNAME
+extern char *__progname;
+#else
+char *__progname;
+#endif
+
+char hostname[MAXHOSTNAMELEN];
+
+static void
+ask_filename(struct passwd *pw, const char *prompt)
+{
+	char buf[1024];
+	char *name = NULL;
+
+	if (key_type_name == NULL)
+		name = _PATH_SSH_CLIENT_ID_RSA;
+	else
+		switch (key_type_from_name(key_type_name)) {
+		case KEY_RSA1:
+			name = _PATH_SSH_CLIENT_IDENTITY;
+			break;
+		case KEY_DSA:
+			name = _PATH_SSH_CLIENT_ID_DSA;
+			break;
+		case KEY_RSA:
+			name = _PATH_SSH_CLIENT_ID_RSA;
+			break;
+		default:
+			(void) fprintf(stderr, gettext("bad key type"));
+			exit(1);
+			break;
+		}
+
+	(void) snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
+	(void) fprintf(stderr, "%s (%s): ", gettext(prompt), identity_file);
+	(void) fflush(stderr);
+	if (fgets(buf, sizeof(buf), stdin) == NULL)
+		exit(1);
+	if (strchr(buf, '\n'))
+		*strchr(buf, '\n') = 0;
+	if (strcmp(buf, "") != 0)
+		(void) strlcpy(identity_file, buf, sizeof(identity_file));
+	have_identity = 1;
+}
+
+static Key *
+load_identity(char *filename)
+{
+	char *pass;
+	Key *prv;
+
+	prv = key_load_private(filename, "", NULL);
+	if (prv == NULL) {
+		if (identity_passphrase)
+			pass = xstrdup(identity_passphrase);
+		else
+			pass = read_passphrase(gettext("Enter passphrase: "),
+			    RP_ALLOW_STDIN);
+		prv = key_load_private(filename, pass, NULL);
+		(void) memset(pass, 0, strlen(pass));
+		xfree(pass);
+	}
+	return prv;
+}
+
+#define SSH_COM_PUBLIC_BEGIN		"---- BEGIN SSH2 PUBLIC KEY ----"
+#define SSH_COM_PUBLIC_END		"---- END SSH2 PUBLIC KEY ----"
+#define SSH_COM_PRIVATE_BEGIN		"---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
+#define	SSH_COM_PRIVATE_KEY_MAGIC	0x3f6ff9eb
+
+static void
+do_convert_to_ssh2(struct passwd *pw)
+{
+	Key *k;
+	u_int len;
+	u_char *blob;
+	struct stat st;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	if ((k = key_load_public(identity_file, NULL)) == NULL) {
+		if ((k = load_identity(identity_file)) == NULL) {
+			(void) fprintf(stderr, gettext("load failed\n"));
+			exit(1);
+		}
+	}
+	if (key_to_blob(k, &blob, &len) <= 0) {
+		(void) fprintf(stderr, gettext("key_to_blob failed\n"));
+		exit(1);
+	}
+	(void) fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
+	(void) fprintf(stdout, gettext(
+	    "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n"),
+	    key_size(k), key_type(k),
+	    pw->pw_name, hostname);
+	dump_base64(stdout, blob, len);
+	(void) fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
+	key_free(k);
+	xfree(blob);
+	exit(0);
+}
+
+static void
+buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
+{
+	int bits = buffer_get_int(b);
+	int bytes = (bits + 7) / 8;
+
+	if (buffer_len(b) < bytes)
+		fatal("buffer_get_bignum_bits: input buffer too small: "
+		    "need %d have %d", bytes, buffer_len(b));
+	(void) BN_bin2bn(buffer_ptr(b), bytes, value);
+	buffer_consume(b, bytes);
+}
+
+static Key *
+do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
+{
+	Buffer b;
+	Key *key = NULL;
+	char *type, *cipher;
+	u_char *sig, data[] = "abcde12345";
+	int magic, rlen, ktype, i1, i2, i3, i4;
+	u_int slen;
+	u_long e;
+
+	buffer_init(&b);
+	buffer_append(&b, blob, blen);
+
+	magic  = buffer_get_int(&b);
+	if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
+		error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
+		buffer_free(&b);
+		return NULL;
+	}
+	i1 = buffer_get_int(&b);
+	type   = buffer_get_string(&b, NULL);
+	cipher = buffer_get_string(&b, NULL);
+	i2 = buffer_get_int(&b);
+	i3 = buffer_get_int(&b);
+	i4 = buffer_get_int(&b);
+	debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
+	if (strcmp(cipher, "none") != 0) {
+		error("unsupported cipher %s", cipher);
+		xfree(cipher);
+		buffer_free(&b);
+		xfree(type);
+		return NULL;
+	}
+	xfree(cipher);
+
+	if (strstr(type, "dsa")) {
+		ktype = KEY_DSA;
+	} else if (strstr(type, "rsa")) {
+		ktype = KEY_RSA;
+	} else {
+		xfree(type);
+		return NULL;
+	}
+	key = key_new_private(ktype);
+	xfree(type);
+
+	switch (key->type) {
+	case KEY_DSA:
+		buffer_get_bignum_bits(&b, key->dsa->p);
+		buffer_get_bignum_bits(&b, key->dsa->g);
+		buffer_get_bignum_bits(&b, key->dsa->q);
+		buffer_get_bignum_bits(&b, key->dsa->pub_key);
+		buffer_get_bignum_bits(&b, key->dsa->priv_key);
+		break;
+	case KEY_RSA:
+		e  = buffer_get_char(&b);
+		debug("e %lx", e);
+		if (e < 30) {
+			e <<= 8;
+			e += buffer_get_char(&b);
+			debug("e %lx", e);
+			e <<= 8;
+			e += buffer_get_char(&b);
+			debug("e %lx", e);
+		}
+		if (!BN_set_word(key->rsa->e, e)) {
+			buffer_free(&b);
+			key_free(key);
+			return NULL;
+		}
+		buffer_get_bignum_bits(&b, key->rsa->d);
+		buffer_get_bignum_bits(&b, key->rsa->n);
+		buffer_get_bignum_bits(&b, key->rsa->iqmp);
+		buffer_get_bignum_bits(&b, key->rsa->q);
+		buffer_get_bignum_bits(&b, key->rsa->p);
+		rsa_generate_additional_parameters(key->rsa);
+		break;
+	}
+	rlen = buffer_len(&b);
+	if (rlen != 0)
+		error("do_convert_private_ssh2_from_blob: "
+		    "remaining bytes in key blob %d", rlen);
+	buffer_free(&b);
+
+	/* try the key */
+	(void) key_sign(key, &sig, &slen, data, sizeof(data));
+	key_verify(key, sig, slen, data, sizeof(data));
+	xfree(sig);
+	return key;
+}
+
+static void
+do_convert_from_ssh2(struct passwd *pw)
+{
+	Key *k;
+	int blen;
+	u_int len;
+	char line[1024], *p;
+	u_char blob[8096];
+	char encoded[8096];
+	struct stat st;
+	int escaped = 0, private = 0, ok;
+	FILE *fp;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	fp = fopen(identity_file, "r");
+	if (fp == NULL) {
+		perror(identity_file);
+		exit(1);
+	}
+	encoded[0] = '\0';
+	while (fgets(line, sizeof(line), fp)) {
+		if (!(p = strchr(line, '\n'))) {
+			(void) fprintf(stderr, gettext("input line too long.\n"));
+			exit(1);
+		}
+		if (p > line && p[-1] == '\\')
+			escaped++;
+		if (strncmp(line, "----", 4) == 0 ||
+		    strstr(line, ": ") != NULL) {
+			if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
+				private = 1;
+			if (strstr(line, " END ") != NULL) {
+				break;
+			}
+			/* fprintf(stderr, "ignore: %s", line); */
+			continue;
+		}
+		if (escaped) {
+			escaped--;
+			/* fprintf(stderr, "escaped: %s", line); */
+			continue;
+		}
+		*p = '\0';
+		(void) strlcat(encoded, line, sizeof(encoded));
+	}
+	len = strlen(encoded);
+	if (((len % 4) == 3) &&
+	    (encoded[len-1] == '=') &&
+	    (encoded[len-2] == '=') &&
+	    (encoded[len-3] == '='))
+		encoded[len-3] = '\0';
+	blen = uudecode(encoded, blob, sizeof(blob));
+	if (blen < 0) {
+		(void) fprintf(stderr, gettext("uudecode failed.\n"));
+		exit(1);
+	}
+	k = private ?
+	    do_convert_private_ssh2_from_blob(blob, blen) :
+	    key_from_blob(blob, blen);
+	if (k == NULL) {
+		(void) fprintf(stderr, gettext("decode blob failed.\n"));
+		exit(1);
+	}
+	ok = private ?
+	    (k->type == KEY_DSA ?
+		 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
+		 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
+	    key_write(k, stdout);
+	if (!ok) {
+		(void) fprintf(stderr, gettext("key write failed"));
+		exit(1);
+	}
+	key_free(k);
+	if (!private)
+		(void) fprintf(stdout, "\n");
+	(void) fclose(fp);
+	exit(0);
+}
+
+static void
+do_print_public(struct passwd *pw)
+{
+	Key *prv;
+	struct stat st;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	prv = load_identity(identity_file);
+	if (prv == NULL) {
+		(void) fprintf(stderr, gettext("load failed\n"));
+		exit(1);
+	}
+	if (!key_write(prv, stdout))
+		(void) fprintf(stderr, gettext("key_write failed"));
+	key_free(prv);
+	(void) fprintf(stdout, "\n");
+	exit(0);
+}
+
+#ifdef SMARTCARD
+static void
+do_upload(struct passwd *pw, const char *sc_reader_id)
+{
+	Key *prv = NULL;
+	struct stat st;
+	int ret;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	prv = load_identity(identity_file);
+	if (prv == NULL) {
+		error("load failed");
+		exit(1);
+	}
+	ret = sc_put_key(prv, sc_reader_id);
+	key_free(prv);
+	if (ret < 0)
+		exit(1);
+	log("loading key done");
+	exit(0);
+}
+
+static void
+do_download(struct passwd *pw, const char *sc_reader_id)
+{
+	Key **keys = NULL;
+	int i;
+
+	keys = sc_get_keys(sc_reader_id, NULL);
+	if (keys == NULL)
+		fatal("cannot read public key from smartcard");
+	for (i = 0; keys[i]; i++) {
+		key_write(keys[i], stdout);
+		key_free(keys[i]);
+		(void) fprintf(stdout, "\n");
+	}
+	xfree(keys);
+	exit(0);
+}
+#endif /* SMARTCARD */
+
+static void
+do_fingerprint(struct passwd *pw)
+{
+	FILE *f;
+	Key *public;
+	char *comment = NULL, *cp, *ep, line[16*1024], *fp;
+	int i, skip = 0, num = 1, invalid = 1;
+	enum fp_rep rep;
+	enum fp_type fptype;
+	struct stat st;
+
+	fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
+	rep =    print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	public = key_load_public(identity_file, &comment);
+	if (public != NULL) {
+		fp = key_fingerprint(public, fptype, rep);
+		(void) printf("%u %s %s\n", key_size(public), fp, comment);
+		key_free(public);
+		xfree(comment);
+		xfree(fp);
+		exit(0);
+	}
+	if (comment)
+		xfree(comment);
+
+	f = fopen(identity_file, "r");
+	if (f != NULL) {
+		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;
+			public = key_new(KEY_RSA1);
+			if (key_read(public, &cp) != 1) {
+				cp = ep;
+				key_free(public);
+				public = key_new(KEY_UNSPEC);
+				if (key_read(public, &cp) != 1) {
+					key_free(public);
+					continue;
+				}
+			}
+			comment = *cp ? cp : comment;
+			fp = key_fingerprint(public, fptype, rep);
+			(void) printf("%u %s %s\n", key_size(public), fp,
+			    comment ? comment : gettext("no comment"));
+			xfree(fp);
+			key_free(public);
+			invalid = 0;
+		}
+		(void) fclose(f);
+	}
+	if (invalid) {
+		(void) printf(gettext("%s is not a public key file.\n"),
+		       identity_file);
+		exit(1);
+	}
+	exit(0);
+}
+
+/*
+ * Perform changing a passphrase.  The argument is the passwd structure
+ * for the current user.
+ */
+static void
+do_change_passphrase(struct passwd *pw)
+{
+	char *comment;
+	char *old_passphrase, *passphrase1, *passphrase2;
+	struct stat st;
+	Key *private;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	/* Try to load the file with empty passphrase. */
+	private = key_load_private(identity_file, "", &comment);
+	if (private == NULL) {
+		if (identity_passphrase)
+			old_passphrase = xstrdup(identity_passphrase);
+		else
+			old_passphrase =
+			    read_passphrase(gettext("Enter old passphrase: "),
+			    RP_ALLOW_STDIN);
+		private = key_load_private(identity_file, old_passphrase,
+		    &comment);
+		(void) memset(old_passphrase, 0, strlen(old_passphrase));
+		xfree(old_passphrase);
+		if (private == NULL) {
+			(void) printf(gettext("Bad passphrase.\n"));
+			exit(1);
+		}
+	}
+	(void) printf(gettext("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(gettext("Enter new passphrase (empty"
+			    " for no passphrase): "), RP_ALLOW_STDIN);
+		passphrase2 = read_passphrase(gettext("Enter same "
+			    "passphrase again: "), RP_ALLOW_STDIN);
+
+		/* Verify that they are the same. */
+		if (strcmp(passphrase1, passphrase2) != 0) {
+			(void) memset(passphrase1, 0, strlen(passphrase1));
+			(void) memset(passphrase2, 0, strlen(passphrase2));
+			xfree(passphrase1);
+			xfree(passphrase2);
+			(void) printf(gettext("Pass phrases do not match.  Try "
+				       "again.\n"));
+			exit(1);
+		}
+		/* Destroy the other copy. */
+		(void) memset(passphrase2, 0, strlen(passphrase2));
+		xfree(passphrase2);
+	}
+
+	/* Save the file using the new passphrase. */
+	if (!key_save_private(private, identity_file, passphrase1, comment)) {
+		(void) printf(gettext("Saving the key failed: %s.\n"), identity_file);
+		(void) memset(passphrase1, 0, strlen(passphrase1));
+		xfree(passphrase1);
+		key_free(private);
+		xfree(comment);
+		exit(1);
+	}
+	/* Destroy the passphrase and the copy of the key in memory. */
+	(void) memset(passphrase1, 0, strlen(passphrase1));
+	xfree(passphrase1);
+	key_free(private);		 /* Destroys contents */
+	xfree(comment);
+
+	(void) printf(gettext("Your identification has been saved with the new "
+		       "passphrase.\n"));
+	exit(0);
+}
+
+/*
+ * Change the comment of a private key file.
+ */
+static void
+do_change_comment(struct passwd *pw)
+{
+	char new_comment[1024], *comment, *passphrase;
+	Key *private;
+	Key *public;
+	struct stat st;
+	FILE *f;
+	int fd;
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which the key is"));
+	if (stat(identity_file, &st) < 0) {
+		perror(identity_file);
+		exit(1);
+	}
+	private = key_load_private(identity_file, "", &comment);
+	if (private == NULL) {
+		if (identity_passphrase)
+			passphrase = xstrdup(identity_passphrase);
+		else if (identity_new_passphrase)
+			passphrase = xstrdup(identity_new_passphrase);
+		else
+			passphrase =
+			    read_passphrase(gettext("Enter passphrase: "),
+				    RP_ALLOW_STDIN);
+		/* Try to load using the passphrase. */
+		private = key_load_private(identity_file, passphrase, &comment);
+		if (private == NULL) {
+			(void) memset(passphrase, 0, strlen(passphrase));
+			xfree(passphrase);
+			(void) printf(gettext("Bad passphrase.\n"));
+			exit(1);
+		}
+	} else {
+		passphrase = xstrdup("");
+	}
+	if (private->type != KEY_RSA1) {
+		(void) fprintf(stderr, gettext("Comments are only supported for "
+				    "RSA1 keys.\n"));
+		key_free(private);
+		exit(1);
+	}
+	(void) printf(gettext("Key now has comment '%s'\n"), comment);
+
+	if (identity_comment) {
+		(void) strlcpy(new_comment, identity_comment, sizeof(new_comment));
+	} else {
+		(void) printf(gettext("Enter new comment: "));
+		(void) fflush(stdout);
+		if (!fgets(new_comment, sizeof(new_comment), stdin)) {
+			(void) memset(passphrase, 0, strlen(passphrase));
+			key_free(private);
+			exit(1);
+		}
+		if (strchr(new_comment, '\n'))
+			*strchr(new_comment, '\n') = 0;
+	}
+
+	/* Save the file using the new passphrase. */
+	if (!key_save_private(private, identity_file, passphrase, new_comment)) {
+		(void) printf(gettext("Saving the key failed: %s.\n"), identity_file);
+		(void) memset(passphrase, 0, strlen(passphrase));
+		xfree(passphrase);
+		key_free(private);
+		xfree(comment);
+		exit(1);
+	}
+	(void) memset(passphrase, 0, strlen(passphrase));
+	xfree(passphrase);
+	public = key_from_private(private);
+	key_free(private);
+
+	(void) strlcat(identity_file, ".pub", sizeof(identity_file));
+	fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (fd == -1) {
+		(void) printf(gettext("Could not save your public key in %s\n"),
+		       identity_file);
+		exit(1);
+	}
+	f = fdopen(fd, "w");
+	if (f == NULL) {
+		(void) printf(gettext("fdopen %s failed"), identity_file);
+		exit(1);
+	}
+	if (!key_write(public, f))
+		(void) fprintf(stderr, gettext("write key failed"));
+	key_free(public);
+	(void) fprintf(f, " %s\n", new_comment);
+	(void) fclose(f);
+
+	xfree(comment);
+
+	(void) printf(gettext("The comment in your key file has been changed.\n"));
+	exit(0);
+}
+
+static void
+usage(void)
+{
+	(void) fprintf(stderr, gettext(
+	"Usage: %s [options]\n"
+	"Options:\n"
+	"  -b bits     Number of bits in the key to create.\n"
+	"  -c          Change comment in private and public key files.\n"
+	"  -e          Convert OpenSSH to IETF SECSH key file.\n"
+	"  -f filename Filename of the key file.\n"
+	"  -i          Convert IETF SECSH to OpenSSH key file.\n"
+	"  -l          Show fingerprint of key file.\n"
+	"  -p          Change passphrase of private key file.\n"
+	"  -q          Quiet.\n"
+	"  -y          Read private key file and print public key.\n"
+	"  -t type     Specify type of key to create.\n"
+	"  -B          Show bubblebabble digest of key file.\n"
+	"  -C comment  Provide new comment.\n"
+	"  -N phrase   Provide new passphrase.\n"
+	"  -P phrase   Provide old passphrase.\n"
+#ifdef SMARTCARD
+	"  -D reader   Download public key from smartcard.\n"
+	"  -U reader   Upload private key to smartcard.\n"
+#endif /* SMARTCARD */
+	), __progname);
+
+	exit(1);
+}
+
+/*
+ * Main program for key management.
+ */
+int
+main(int ac, char **av)
+{
+	char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
+	char *reader_id = NULL;
+	Key *private, *public;
+	struct passwd *pw;
+	struct stat st;
+	int opt, type, fd;
+#ifdef SMARTCARD
+	int download = 0;
+#endif /* SMARTCARD */
+	FILE *f;
+
+	extern int optind;
+	extern char *optarg;
+
+	__progname = get_progname(av[0]);
+
+	(void) g11n_setlocale(LC_ALL, "");
+
+	SSLeay_add_all_algorithms();
+	init_rng();
+	seed_rng();
+
+	/* we need this for the home * directory.  */
+	pw = getpwuid(getuid());
+	if (!pw) {
+		(void) printf(gettext("You don't exist, go away!\n"));
+		exit(1);
+	}
+	if (gethostname(hostname, sizeof(hostname)) < 0) {
+		perror("gethostname");
+		exit(1);
+	}
+
+#ifdef SMARTCARD
+#define GETOPT_ARGS "deiqpclBRxXyb:f:t:U:D:P:N:C:"
+#else
+#define GETOPT_ARGS "deiqpclBRxXyb:f:t:P:N:C:"
+#endif /* SMARTCARD */
+	while ((opt = getopt(ac, av, GETOPT_ARGS)) != -1) {
+		switch (opt) {
+		case 'b':
+			bits = atoi(optarg);
+			if (bits < 512 || bits > 32768) {
+				(void) printf(gettext("Bits has bad value.\n"));
+				exit(1);
+			}
+			break;
+		case 'l':
+			print_fingerprint = 1;
+			break;
+		case 'B':
+			print_bubblebabble = 1;
+			break;
+		case 'p':
+			change_passphrase = 1;
+			break;
+		case 'c':
+			change_comment = 1;
+			break;
+		case 'f':
+			(void) 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 'R':
+			/* unused */
+			exit(0);
+			break;
+		case 'e':
+		case 'x':
+			/* export key */
+			convert_to_ssh2 = 1;
+			break;
+		case 'i':
+		case 'X':
+			/* import key */
+			convert_from_ssh2 = 1;
+			break;
+		case 'y':
+			print_public = 1;
+			break;
+		case 'd':
+			key_type_name = "dsa";
+			break;
+		case 't':
+			key_type_name = optarg;
+			break;
+#ifdef SMARTCARD
+		case 'D':
+			download = 1;
+		case 'U':
+			reader_id = optarg;
+			break;
+#endif
+		case '?':
+		default:
+			usage();
+		}
+	}
+	if (optind < ac) {
+		(void) printf(gettext("Too many arguments.\n"));
+		usage();
+	}
+	if (change_passphrase && change_comment) {
+		(void) printf(gettext("Can only have one of -p and -c.\n"));
+		usage();
+	}
+	if (print_fingerprint || print_bubblebabble)
+		do_fingerprint(pw);
+	if (change_passphrase)
+		do_change_passphrase(pw);
+	if (change_comment)
+		do_change_comment(pw);
+	if (convert_to_ssh2)
+		do_convert_to_ssh2(pw);
+	if (convert_from_ssh2)
+		do_convert_from_ssh2(pw);
+	if (print_public)
+		do_print_public(pw);
+	if (reader_id != NULL) {
+#ifdef SMARTCARD
+		if (download)
+			do_download(pw, reader_id);
+		else
+			do_upload(pw, reader_id);
+#else /* SMARTCARD */
+		fatal("no support for smartcards.");
+#endif /* SMARTCARD */
+	}
+
+	arc4random_stir();
+
+	if (key_type_name == NULL) {
+		(void) printf(gettext("You must specify a key type (-t).\n"));
+		usage();
+	}
+	type = key_type_from_name(key_type_name);
+	if (type == KEY_UNSPEC) {
+		(void) fprintf(stderr, gettext("unknown key type %s\n"),
+			key_type_name);
+		exit(1);
+	}
+	if (!quiet)
+		(void) printf(gettext("Generating public/private %s key pair.\n"),
+			key_type_name);
+	private = key_generate(type, bits);
+	if (private == NULL) {
+		(void) fprintf(stderr, gettext("key_generate failed"));
+		exit(1);
+	}
+	public  = key_from_private(private);
+
+	if (!have_identity)
+		ask_filename(pw, gettext("Enter file in which to save the key"));
+
+	/* Create ~/.ssh directory if it doesn\'t already exist. */
+	(void) snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
+	if (strstr(identity_file, dotsshdir) != NULL &&
+	    stat(dotsshdir, &st) < 0) {
+		if (mkdir(dotsshdir, 0700) < 0)
+			error("Could not create directory '%s'.", dotsshdir);
+		else if (!quiet)
+			(void) printf(gettext("Created directory '%s'.\n"), dotsshdir);
+	}
+	/* If the file already exists, ask the user to confirm. */
+	if (stat(identity_file, &st) >= 0) {
+		char yesno[128];
+		(void) printf(gettext("%s already exists.\n"), identity_file);
+		(void) printf(gettext("Overwrite (%s/%s)? "),
+				      nl_langinfo(YESSTR), nl_langinfo(NOSTR));
+		(void) fflush(stdout);
+		if (fgets(yesno, sizeof(yesno), stdin) == NULL)
+			exit(1);
+		if (strcasecmp(yesno, nl_langinfo(YESSTR)) != 0)
+			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(gettext("Enter passphrase (empty "
+			"for no passphrase): "), RP_ALLOW_STDIN);
+		passphrase2 = read_passphrase(gettext("Enter same "
+			    "passphrase again: "), RP_ALLOW_STDIN);
+		if (strcmp(passphrase1, passphrase2) != 0) {
+			/*
+			 * The passphrases do not match.  Clear them and
+			 * retry.
+			 */
+			(void) memset(passphrase1, 0, strlen(passphrase1));
+			(void) memset(passphrase2, 0, strlen(passphrase2));
+			xfree(passphrase1);
+			xfree(passphrase2);
+			(void) printf(gettext("Passphrases do not match.  Try "
+				    "again.\n"));
+			goto passphrase_again;
+		}
+		/* Clear the other copy of the passphrase. */
+		(void) memset(passphrase2, 0, strlen(passphrase2));
+		xfree(passphrase2);
+	}
+
+	if (identity_comment) {
+		(void) strlcpy(comment, identity_comment, sizeof(comment));
+	} else {
+		/* Create default commend field for the passphrase. */
+		(void) snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
+	}
+
+	/* Save the key with the given passphrase and comment. */
+	if (!key_save_private(private, identity_file, passphrase1, comment)) {
+		(void) printf(gettext("Saving the key failed: %s.\n"), identity_file);
+		(void) memset(passphrase1, 0, strlen(passphrase1));
+		xfree(passphrase1);
+		exit(1);
+	}
+	/* Clear the passphrase. */
+	(void) memset(passphrase1, 0, strlen(passphrase1));
+	xfree(passphrase1);
+
+	/* Clear the private key and the random number generator. */
+	key_free(private);
+	arc4random_stir();
+
+	if (!quiet)
+		(void) printf(gettext("Your identification has been saved in %s.\n"),
+			identity_file);
+
+	(void) strlcat(identity_file, ".pub", sizeof(identity_file));
+	fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (fd == -1) {
+		(void) printf(gettext("Could not save your public key in %s\n"),
+			identity_file);
+		exit(1);
+	}
+	f = fdopen(fd, "w");
+	if (f == NULL) {
+		(void) printf(gettext("fdopen %s failed"), identity_file);
+		exit(1);
+	}
+	if (!key_write(public, f))
+		(void) fprintf(stderr, gettext("write key failed"));
+	(void) fprintf(f, " %s\n", comment);
+	(void) fclose(f);
+
+	if (!quiet) {
+		char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
+		(void) printf(gettext("Your public key has been saved in %s.\n"),
+		    identity_file);
+		(void) printf(gettext("The key fingerprint is:\n"));
+		(void) printf("%s %s\n", fp, comment);
+		xfree(fp);
+	}
+
+	key_free(public);
+	return(0);
+	/* NOTREACHED */
+}