File: [local] / src / usr.bin / ssh / ssh-keygen.c (download)
Revision 1.200, Tue Aug 31 11:54:45 2010 UTC (13 years, 8 months ago) by djm
Branch: MAIN
Changes since 1.199: +36 -4 lines
Implement Elliptic Curve Cryptography modes for key exchange (ECDH) and
host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA offer
better performance than plain DH and DSA at the same equivalent symmetric
key length, as well as much shorter keys.
Only the mandatory sections of RFC5656 are implemented, specifically the
three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and
ECDSA. Point compression (optional in RFC5656 is NOT implemented).
Certificate host and user keys using the new ECDSA key types are supported.
Note that this code has not been tested for interoperability and may be
subject to change.
feedback and ok markus@
|
/* $OpenBSD: ssh-keygen.c,v 1.200 2010/08/31 11:54:45 djm Exp $ */
/*
* 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "xmalloc.h"
#include "key.h"
#include "rsa.h"
#include "authfile.h"
#include "uuencode.h"
#include "buffer.h"
#include "pathnames.h"
#include "log.h"
#include "misc.h"
#include "match.h"
#include "hostfile.h"
#include "dns.h"
#include "ssh2.h"
#ifdef ENABLE_PKCS11
#include "ssh-pkcs11.h"
#endif
/* Number of bits in the RSA/DSA key. This value can be set on the command line. */
#define DEFAULT_BITS 2048
#define DEFAULT_BITS_DSA 1024
#define DEFAULT_BITS_ECDSA 521
u_int32_t bits = 0;
/*
* 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;
int log_level = SYSLOG_LEVEL_INFO;
/* Flag indicating that we want to hash a known_hosts file */
int hash_hosts = 0;
/* Flag indicating that we want lookup a host in known_hosts file */
int find_host = 0;
/* Flag indicating that we want to delete a host from a known_hosts file */
int delete_host = 0;
/* Flag indicating that we want to show the contents of a certificate */
int show_cert = 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;
/* Path to CA key when certifying keys. */
char *ca_key_path = NULL;
/* Certificate serial number */
long long cert_serial = 0;
/* Key type when certifying */
u_int cert_key_type = SSH2_CERT_TYPE_USER;
/* "key ID" of signed key */
char *cert_key_id = NULL;
/* Comma-separated list of principal names for certifying keys */
char *cert_principals = NULL;
/* Validity period for certificates */
u_int64_t cert_valid_from = 0;
u_int64_t cert_valid_to = ~0ULL;
/* Certificate options */
#define CERTOPT_X_FWD (1)
#define CERTOPT_AGENT_FWD (1<<1)
#define CERTOPT_PORT_FWD (1<<2)
#define CERTOPT_PTY (1<<3)
#define CERTOPT_USER_RC (1<<4)
#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
u_int32_t certflags_flags = CERTOPT_DEFAULT;
char *certflags_command = NULL;
char *certflags_src_addr = NULL;
/* Conversion to/from various formats */
int convert_to = 0;
int convert_from = 0;
enum {
FMT_RFC4716,
FMT_PKCS8,
FMT_PEM
} convert_format = FMT_RFC4716;
int print_public = 0;
int print_generic = 0;
char *key_type_name = NULL;
/* Load key from this PKCS#11 provider */
char *pkcs11provider = NULL;
/* argv0 */
extern char *__progname;
char hostname[MAXHOSTNAMELEN];
/* moduli.c */
int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
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_CERT:
case KEY_DSA_CERT_V00:
case KEY_DSA:
name = _PATH_SSH_CLIENT_ID_DSA;
break;
case KEY_ECDSA_CERT:
case KEY_ECDSA:
name = _PATH_SSH_CLIENT_ID_ECDSA;
break;
case KEY_RSA_CERT:
case KEY_RSA_CERT_V00:
case KEY_RSA:
name = _PATH_SSH_CLIENT_ID_RSA;
break;
default:
fprintf(stderr, "bad key type\n");
exit(1);
break;
}
}
snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
fprintf(stderr, "%s (%s): ", prompt, identity_file);
if (fgets(buf, sizeof(buf), stdin) == NULL)
exit(1);
buf[strcspn(buf, "\n")] = '\0';
if (strcmp(buf, "") != 0)
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("Enter passphrase: ",
RP_ALLOW_STDIN);
prv = key_load_private(filename, pass, NULL);
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;
char comment[61];
if (key_to_blob(k, &blob, &len) <= 0) {
fprintf(stderr, "key_to_blob failed\n");
exit(1);
}
/* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
snprintf(comment, sizeof(comment),
"%u-bit %s, converted by %s@%s from OpenSSH",
key_size(k), key_type(k),
pw->pw_name, hostname);
fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
fprintf(stdout, "Comment: \"%s\"\n", comment);
dump_base64(stdout, blob, len);
fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
key_free(k);
xfree(blob);
exit(0);
}
static void
do_convert_to_pkcs8(Key *k)
{
switch (key_type_plain(k->type)) {
case KEY_RSA:
if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
fatal("PEM_write_RSA_PUBKEY failed");
break;
case KEY_DSA:
if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
fatal("PEM_write_DSA_PUBKEY failed");
break;
case KEY_ECDSA:
if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
fatal("PEM_write_EC_PUBKEY failed");
break;
default:
fatal("%s: unsupported key type %s", __func__, key_type(k));
}
exit(0);
}
static void
do_convert_to_pem(Key *k)
{
switch (key_type_plain(k->type)) {
case KEY_RSA:
if (!PEM_write_RSAPublicKey(stdout, k->rsa))
fatal("PEM_write_RSAPublicKey failed");
break;
#if notyet /* OpenSSH 0.9.8 lacks this function */
case KEY_DSA:
if (!PEM_write_DSAPublicKey(stdout, k->dsa))
fatal("PEM_write_DSAPublicKey failed");
break;
#endif
/* XXX ECDSA? */
default:
fatal("%s: unsupported key type %s", __func__, key_type(k));
}
exit(0);
}
static void
do_convert_to(struct passwd *pw)
{
Key *k;
struct stat st;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) < 0)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((k = key_load_public(identity_file, NULL)) == NULL) {
if ((k = load_identity(identity_file)) == NULL) {
fprintf(stderr, "load failed\n");
exit(1);
}
}
if (k->type == KEY_RSA1) {
fprintf(stderr, "version 1 keys are not supported\n");
exit(1);
}
switch (convert_format) {
case FMT_RFC4716:
do_convert_to_ssh2(pw, k);
break;
case FMT_PKCS8:
do_convert_to_pkcs8(k);
break;
case FMT_PEM:
do_convert_to_pem(k);
break;
default:
fatal("%s: unknown key format %d", __func__, convert_format);
}
exit(0);
}
static void
buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
{
u_int bignum_bits = buffer_get_int(b);
u_int bytes = (bignum_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));
if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL)
fatal("buffer_get_bignum_bits: BN_bin2bn failed");
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 {
buffer_free(&b);
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 */
key_sign(key, &sig, &slen, data, sizeof(data));
key_verify(key, sig, slen, data, sizeof(data));
xfree(sig);
return key;
}
static int
get_line(FILE *fp, char *line, size_t len)
{
int c;
size_t pos = 0;
line[0] = '\0';
while ((c = fgetc(fp)) != EOF) {
if (pos >= len - 1) {
fprintf(stderr, "input line too long.\n");
exit(1);
}
switch (c) {
case '\r':
c = fgetc(fp);
if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
fprintf(stderr, "unget: %s\n", strerror(errno));
exit(1);
}
return pos;
case '\n':
return pos;
}
line[pos++] = c;
line[pos] = '\0';
}
/* We reached EOF */
return -1;
}
static void
do_convert_from_ssh2(struct passwd *pw, Key **k, int *private)
{
int blen;
u_int len;
char line[1024];
u_char blob[8096];
char encoded[8096];
int escaped = 0;
FILE *fp;
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
encoded[0] = '\0';
while ((blen = get_line(fp, line, sizeof(line))) != -1) {
if (line[blen - 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;
}
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) {
fprintf(stderr, "uudecode failed.\n");
exit(1);
}
*k = *private ?
do_convert_private_ssh2_from_blob(blob, blen) :
key_from_blob(blob, blen);
if (*k == NULL) {
fprintf(stderr, "decode blob failed.\n");
exit(1);
}
fclose(fp);
}
static void
do_convert_from_pkcs8(Key **k, int *private)
{
EVP_PKEY *pubkey;
FILE *fp;
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
fatal("%s: %s is not a recognised public key format", __func__,
identity_file);
}
fclose(fp);
switch (EVP_PKEY_type(pubkey->type)) {
case EVP_PKEY_RSA:
*k = key_new(KEY_UNSPEC);
(*k)->type = KEY_RSA;
(*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
break;
case EVP_PKEY_DSA:
*k = key_new(KEY_UNSPEC);
(*k)->type = KEY_DSA;
(*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
break;
case EVP_PKEY_EC:
*k = key_new(KEY_UNSPEC);
(*k)->type = KEY_ECDSA;
(*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
(*k)->ecdsa_nid = key_ecdsa_group_to_nid(
EC_KEY_get0_group((*k)->ecdsa));
break;
default:
fatal("%s: unsupported pubkey type %d", __func__,
EVP_PKEY_type(pubkey->type));
}
EVP_PKEY_free(pubkey);
return;
}
static void
do_convert_from_pem(Key **k, int *private)
{
FILE *fp;
RSA *rsa;
#ifdef notyet
DSA *dsa;
#endif
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
*k = key_new(KEY_UNSPEC);
(*k)->type = KEY_RSA;
(*k)->rsa = rsa;
fclose(fp);
return;
}
#if notyet /* OpenSSH 0.9.8 lacks this function */
rewind(fp);
if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
*k = key_new(KEY_UNSPEC);
(*k)->type = KEY_DSA;
(*k)->dsa = dsa;
fclose(fp);
return;
}
/* XXX ECDSA */
#endif
fatal("%s: unrecognised raw private key format", __func__);
}
static void
do_convert_from(struct passwd *pw)
{
Key *k = NULL;
int private = 0, ok = 0;
struct stat st;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) < 0)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
switch (convert_format) {
case FMT_RFC4716:
do_convert_from_ssh2(pw, &k, &private);
break;
case FMT_PKCS8:
do_convert_from_pkcs8(&k, &private);
break;
case FMT_PEM:
do_convert_from_pem(&k, &private);
break;
default:
fatal("%s: unknown key format %d", __func__, convert_format);
}
if (!private)
ok = key_write(k, stdout);
if (ok)
fprintf(stdout, "\n");
else {
switch (k->type) {
case KEY_DSA:
ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
NULL, 0, NULL, NULL);
break;
case KEY_ECDSA:
ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
NULL, 0, NULL, NULL);
break;
case KEY_RSA:
ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
NULL, 0, NULL, NULL);
break;
default:
fatal("%s: unsupported key type %s", __func__,
key_type(k));
}
}
if (!ok) {
fprintf(stderr, "key write failed\n");
exit(1);
}
key_free(k);
exit(0);
}
static void
do_print_public(struct passwd *pw)
{
Key *prv;
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);
}
prv = load_identity(identity_file);
if (prv == NULL) {
fprintf(stderr, "load failed\n");
exit(1);
}
if (!key_write(prv, stdout))
fprintf(stderr, "key_write failed");
key_free(prv);
fprintf(stdout, "\n");
exit(0);
}
static void
do_download(struct passwd *pw)
{
#ifdef ENABLE_PKCS11
Key **keys = NULL;
int i, nkeys;
pkcs11_init(0);
nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys);
if (nkeys <= 0)
fatal("cannot read public key from pkcs11");
for (i = 0; i < nkeys; i++) {
key_write(keys[i], stdout);
key_free(keys[i]);
fprintf(stdout, "\n");
}
xfree(keys);
pkcs11_terminate();
exit(0);
#else
fatal("no pkcs11 support");
#endif /* ENABLE_PKCS11 */
}
static void
do_fingerprint(struct passwd *pw)
{
FILE *f;
Key *public;
char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra;
int i, skip = 0, num = 0, 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, "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);
ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
printf("%u %s %s (%s)\n", key_size(public), fp, comment,
key_type(public));
if (log_level >= SYSLOG_LEVEL_VERBOSE)
printf("%s\n", ra);
key_free(public);
xfree(comment);
xfree(ra);
xfree(fp);
exit(0);
}
if (comment) {
xfree(comment);
comment = NULL;
}
if ((f = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
while (fgets(line, sizeof(line), f)) {
if ((cp = strchr(line, '\n')) == NULL) {
error("line %d too long: %.40s...",
num + 1, line);
skip = 1;
continue;
}
num++;
if (skip) {
skip = 0;
continue;
}
*cp = '\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);
ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
printf("%u %s %s (%s)\n", key_size(public), fp,
comment ? comment : "no comment", key_type(public));
if (log_level >= SYSLOG_LEVEL_VERBOSE)
printf("%s\n", ra);
xfree(ra);
xfree(fp);
key_free(public);
invalid = 0;
}
fclose(f);
if (invalid) {
printf("%s is not a public key file.\n", identity_file);
exit(1);
}
exit(0);
}
static void
printhost(FILE *f, const char *name, Key *public, int ca, int hash)
{
if (print_fingerprint) {
enum fp_rep rep;
enum fp_type fptype;
char *fp, *ra;
fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
fp = key_fingerprint(public, fptype, rep);
ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
printf("%u %s %s (%s)\n", key_size(public), fp, name,
key_type(public));
if (log_level >= SYSLOG_LEVEL_VERBOSE)
printf("%s\n", ra);
xfree(ra);
xfree(fp);
} else {
if (hash && (name = host_hash(name, NULL, 0)) == NULL)
fatal("hash_host failed");
fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name);
if (!key_write(public, f))
fatal("key_write failed");
fprintf(f, "\n");
}
}
static void
do_known_hosts(struct passwd *pw, const char *name)
{
FILE *in, *out = stdout;
Key *pub;
char *cp, *cp2, *kp, *kp2;
char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
int ca;
if (!have_identity) {
cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
sizeof(identity_file))
fatal("Specified known hosts path too long");
xfree(cp);
have_identity = 1;
}
if ((in = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
/*
* Find hosts goes to stdout, hash and deletions happen in-place
* A corner case is ssh-keygen -HF foo, which should go to stdout
*/
if (!find_host && (hash_hosts || delete_host)) {
if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
strlcat(old, ".old", sizeof(old)) >= sizeof(old))
fatal("known_hosts path too long");
umask(077);
if ((c = mkstemp(tmp)) == -1)
fatal("mkstemp: %s", strerror(errno));
if ((out = fdopen(c, "w")) == NULL) {
c = errno;
unlink(tmp);
fatal("fdopen: %s", strerror(c));
}
inplace = 1;
}
while (fgets(line, sizeof(line), in)) {
if ((cp = strchr(line, '\n')) == NULL) {
error("line %d too long: %.40s...", num + 1, line);
skip = 1;
invalid = 1;
continue;
}
num++;
if (skip) {
skip = 0;
continue;
}
*cp = '\0';
/* Skip leading whitespace, empty and comment lines. */
for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
;
if (!*cp || *cp == '\n' || *cp == '#') {
if (inplace)
fprintf(out, "%s\n", cp);
continue;
}
/* Check whether this is a CA key */
if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 &&
(cp[sizeof(CA_MARKER) - 1] == ' ' ||
cp[sizeof(CA_MARKER) - 1] == '\t')) {
ca = 1;
cp += sizeof(CA_MARKER);
} else
ca = 0;
/* Find the end of the host name portion. */
for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
;
if (*kp == '\0' || *(kp + 1) == '\0') {
error("line %d missing key: %.40s...",
num, line);
invalid = 1;
continue;
}
*kp++ = '\0';
kp2 = kp;
pub = key_new(KEY_RSA1);
if (key_read(pub, &kp) != 1) {
kp = kp2;
key_free(pub);
pub = key_new(KEY_UNSPEC);
if (key_read(pub, &kp) != 1) {
error("line %d invalid key: %.40s...",
num, line);
key_free(pub);
invalid = 1;
continue;
}
}
if (*cp == HASH_DELIM) {
if (find_host || delete_host) {
cp2 = host_hash(name, cp, strlen(cp));
if (cp2 == NULL) {
error("line %d: invalid hashed "
"name: %.64s...", num, line);
invalid = 1;
continue;
}
c = (strcmp(cp2, cp) == 0);
if (find_host && c) {
printf("# Host %s found: "
"line %d type %s%s\n", name,
num, key_type(pub),
ca ? " (CA key)" : "");
printhost(out, cp, pub, ca, 0);
}
if (delete_host && !c && !ca)
printhost(out, cp, pub, ca, 0);
} else if (hash_hosts)
printhost(out, cp, pub, ca, 0);
} else {
if (find_host || delete_host) {
c = (match_hostname(name, cp,
strlen(cp)) == 1);
if (find_host && c) {
printf("# Host %s found: "
"line %d type %s%s\n", name,
num, key_type(pub),
ca ? " (CA key)" : "");
printhost(out, name, pub,
ca, hash_hosts && !ca);
}
if (delete_host && !c && !ca)
printhost(out, cp, pub, ca, 0);
} else if (hash_hosts) {
for (cp2 = strsep(&cp, ",");
cp2 != NULL && *cp2 != '\0';
cp2 = strsep(&cp, ",")) {
if (ca) {
fprintf(stderr, "Warning: "
"ignoring CA key for host: "
"%.64s\n", cp2);
printhost(out, cp2, pub, ca, 0);
} else if (strcspn(cp2, "*?!") !=
strlen(cp2)) {
fprintf(stderr, "Warning: "
"ignoring host name with "
"metacharacters: %.64s\n",
cp2);
printhost(out, cp2, pub, ca, 0);
} else
printhost(out, cp2, pub, ca, 1);
}
has_unhashed = 1;
}
}
key_free(pub);
}
fclose(in);
if (invalid) {
fprintf(stderr, "%s is not a valid known_hosts file.\n",
identity_file);
if (inplace) {
fprintf(stderr, "Not replacing existing known_hosts "
"file because of errors\n");
fclose(out);
unlink(tmp);
}
exit(1);
}
if (inplace) {
fclose(out);
/* Backup existing file */
if (unlink(old) == -1 && errno != ENOENT)
fatal("unlink %.100s: %s", old, strerror(errno));
if (link(identity_file, old) == -1)
fatal("link %.100s to %.100s: %s", identity_file, old,
strerror(errno));
/* Move new one into place */
if (rename(tmp, identity_file) == -1) {
error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
strerror(errno));
unlink(tmp);
unlink(old);
exit(1);
}
fprintf(stderr, "%s updated.\n", identity_file);
fprintf(stderr, "Original contents retained as %s\n", old);
if (has_unhashed) {
fprintf(stderr, "WARNING: %s contains unhashed "
"entries\n", old);
fprintf(stderr, "Delete this file to ensure privacy "
"of hostnames\n");
}
}
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, "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("Enter old passphrase: ",
RP_ALLOW_STDIN);
private = key_load_private(identity_file, old_passphrase,
&comment);
memset(old_passphrase, 0, strlen(old_passphrase));
xfree(old_passphrase);
if (private == NULL) {
printf("Bad passphrase.\n");
exit(1);
}
}
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): ", RP_ALLOW_STDIN);
passphrase2 = read_passphrase("Enter same passphrase again: ",
RP_ALLOW_STDIN);
/* 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 (!key_save_private(private, identity_file, passphrase1, comment)) {
printf("Saving the key failed: %s.\n", identity_file);
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. */
memset(passphrase1, 0, strlen(passphrase1));
xfree(passphrase1);
key_free(private); /* Destroys contents */
xfree(comment);
printf("Your identification has been saved with the new passphrase.\n");
exit(0);
}
/*
* Print the SSHFP RR.
*/
static int
do_print_resource_record(struct passwd *pw, char *fname, char *hname)
{
Key *public;
char *comment = NULL;
struct stat st;
if (fname == NULL)
ask_filename(pw, "Enter file in which the key is");
if (stat(fname, &st) < 0) {
if (errno == ENOENT)
return 0;
perror(fname);
exit(1);
}
public = key_load_public(fname, &comment);
if (public != NULL) {
export_dns_rr(hname, public, stdout, print_generic);
key_free(public);
xfree(comment);
return 1;
}
if (comment)
xfree(comment);
printf("failed to read v2 public key from %s.\n", fname);
exit(1);
}
/*
* 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, "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("Enter passphrase: ",
RP_ALLOW_STDIN);
/* Try to load using the passphrase. */
private = key_load_private(identity_file, passphrase, &comment);
if (private == NULL) {
memset(passphrase, 0, strlen(passphrase));
xfree(passphrase);
printf("Bad passphrase.\n");
exit(1);
}
} else {
passphrase = xstrdup("");
}
if (private->type != KEY_RSA1) {
fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
key_free(private);
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));
key_free(private);
exit(1);
}
new_comment[strcspn(new_comment, "\n")] = '\0';
}
/* Save the file using the new passphrase. */
if (!key_save_private(private, identity_file, passphrase, new_comment)) {
printf("Saving the key failed: %s.\n", identity_file);
memset(passphrase, 0, strlen(passphrase));
xfree(passphrase);
key_free(private);
xfree(comment);
exit(1);
}
memset(passphrase, 0, strlen(passphrase));
xfree(passphrase);
public = key_from_private(private);
key_free(private);
strlcat(identity_file, ".pub", sizeof(identity_file));
fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1) {
printf("Could not save your public key in %s\n", identity_file);
exit(1);
}
f = fdopen(fd, "w");
if (f == NULL) {
printf("fdopen %s failed\n", identity_file);
exit(1);
}
if (!key_write(public, f))
fprintf(stderr, "write key failed\n");
key_free(public);
fprintf(f, " %s\n", new_comment);
fclose(f);
xfree(comment);
printf("The comment in your key file has been changed.\n");
exit(0);
}
static const char *
fmt_validity(u_int64_t valid_from, u_int64_t valid_to)
{
char from[32], to[32];
static char ret[64];
time_t tt;
struct tm *tm;
*from = *to = '\0';
if (valid_from == 0 && valid_to == 0xffffffffffffffffULL)
return "forever";
if (valid_from != 0) {
/* XXX revisit INT_MAX in 2038 :) */
tt = valid_from > INT_MAX ? INT_MAX : valid_from;
tm = localtime(&tt);
strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
}
if (valid_to != 0xffffffffffffffffULL) {
/* XXX revisit INT_MAX in 2038 :) */
tt = valid_to > INT_MAX ? INT_MAX : valid_to;
tm = localtime(&tt);
strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
}
if (valid_from == 0) {
snprintf(ret, sizeof(ret), "before %s", to);
return ret;
}
if (valid_to == 0xffffffffffffffffULL) {
snprintf(ret, sizeof(ret), "after %s", from);
return ret;
}
snprintf(ret, sizeof(ret), "from %s to %s", from, to);
return ret;
}
static void
add_flag_option(Buffer *c, const char *name)
{
debug3("%s: %s", __func__, name);
buffer_put_cstring(c, name);
buffer_put_string(c, NULL, 0);
}
static void
add_string_option(Buffer *c, const char *name, const char *value)
{
Buffer b;
debug3("%s: %s=%s", __func__, name, value);
buffer_init(&b);
buffer_put_cstring(&b, value);
buffer_put_cstring(c, name);
buffer_put_string(c, buffer_ptr(&b), buffer_len(&b));
buffer_free(&b);
}
#define OPTIONS_CRITICAL 1
#define OPTIONS_EXTENSIONS 2
static void
prepare_options_buf(Buffer *c, int which)
{
buffer_clear(c);
if ((which & OPTIONS_CRITICAL) != 0 &&
certflags_command != NULL)
add_string_option(c, "force-command", certflags_command);
if ((which & OPTIONS_EXTENSIONS) != 0 &&
(certflags_flags & CERTOPT_AGENT_FWD) != 0)
add_flag_option(c, "permit-agent-forwarding");
if ((which & OPTIONS_EXTENSIONS) != 0 &&
(certflags_flags & CERTOPT_PORT_FWD) != 0)
add_flag_option(c, "permit-port-forwarding");
if ((which & OPTIONS_EXTENSIONS) != 0 &&
(certflags_flags & CERTOPT_PTY) != 0)
add_flag_option(c, "permit-pty");
if ((which & OPTIONS_EXTENSIONS) != 0 &&
(certflags_flags & CERTOPT_USER_RC) != 0)
add_flag_option(c, "permit-user-rc");
if ((which & OPTIONS_EXTENSIONS) != 0 &&
(certflags_flags & CERTOPT_X_FWD) != 0)
add_flag_option(c, "permit-X11-forwarding");
if ((which & OPTIONS_CRITICAL) != 0 &&
certflags_src_addr != NULL)
add_string_option(c, "source-address", certflags_src_addr);
}
static Key *
load_pkcs11_key(char *path)
{
#ifdef ENABLE_PKCS11
Key **keys = NULL, *public, *private = NULL;
int i, nkeys;
if ((public = key_load_public(path, NULL)) == NULL)
fatal("Couldn't load CA public key \"%s\"", path);
nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys);
debug3("%s: %d keys", __func__, nkeys);
if (nkeys <= 0)
fatal("cannot read public key from pkcs11");
for (i = 0; i < nkeys; i++) {
if (key_equal_public(public, keys[i])) {
private = keys[i];
continue;
}
key_free(keys[i]);
}
xfree(keys);
key_free(public);
return private;
#else
fatal("no pkcs11 support");
#endif /* ENABLE_PKCS11 */
}
static void
do_ca_sign(struct passwd *pw, int argc, char **argv)
{
int i, fd;
u_int n;
Key *ca, *public;
char *otmp, *tmp, *cp, *out, *comment, **plist = NULL;
FILE *f;
int v00 = 0; /* legacy keys */
if (key_type_name != NULL) {
switch (key_type_from_name(key_type_name)) {
case KEY_RSA_CERT_V00:
case KEY_DSA_CERT_V00:
v00 = 1;
break;
case KEY_UNSPEC:
if (strcasecmp(key_type_name, "v00") == 0) {
v00 = 1;
break;
} else if (strcasecmp(key_type_name, "v01") == 0)
break;
/* FALLTHROUGH */
default:
fprintf(stderr, "unknown key type %s\n", key_type_name);
exit(1);
}
}
pkcs11_init(1);
tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
if (pkcs11provider != NULL) {
if ((ca = load_pkcs11_key(tmp)) == NULL)
fatal("No PKCS#11 key matching %s found", ca_key_path);
} else if ((ca = load_identity(tmp)) == NULL)
fatal("Couldn't load CA key \"%s\"", tmp);
xfree(tmp);
for (i = 0; i < argc; i++) {
/* Split list of principals */
n = 0;
if (cert_principals != NULL) {
otmp = tmp = xstrdup(cert_principals);
plist = NULL;
for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
plist = xrealloc(plist, n + 1, sizeof(*plist));
if (*(plist[n] = xstrdup(cp)) == '\0')
fatal("Empty principal name");
}
xfree(otmp);
}
tmp = tilde_expand_filename(argv[i], pw->pw_uid);
if ((public = key_load_public(tmp, &comment)) == NULL)
fatal("%s: unable to open \"%s\"", __func__, tmp);
if (public->type != KEY_RSA && public->type != KEY_DSA &&
public->type != KEY_ECDSA)
fatal("%s: key \"%s\" type %s cannot be certified",
__func__, tmp, key_type(public));
/* Prepare certificate to sign */
if (key_to_certified(public, v00) != 0)
fatal("Could not upgrade key %s to certificate", tmp);
public->cert->type = cert_key_type;
public->cert->serial = (u_int64_t)cert_serial;
public->cert->key_id = xstrdup(cert_key_id);
public->cert->nprincipals = n;
public->cert->principals = plist;
public->cert->valid_after = cert_valid_from;
public->cert->valid_before = cert_valid_to;
if (v00) {
prepare_options_buf(&public->cert->critical,
OPTIONS_CRITICAL|OPTIONS_EXTENSIONS);
} else {
prepare_options_buf(&public->cert->critical,
OPTIONS_CRITICAL);
prepare_options_buf(&public->cert->extensions,
OPTIONS_EXTENSIONS);
}
public->cert->signature_key = key_from_private(ca);
if (key_certify(public, ca) != 0)
fatal("Couldn't not certify key %s", tmp);
if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
*cp = '\0';
xasprintf(&out, "%s-cert.pub", tmp);
xfree(tmp);
if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
fatal("Could not open \"%s\" for writing: %s", out,
strerror(errno));
if ((f = fdopen(fd, "w")) == NULL)
fatal("%s: fdopen: %s", __func__, strerror(errno));
if (!key_write(public, f))
fatal("Could not write certified key to %s", out);
fprintf(f, " %s\n", comment);
fclose(f);
if (!quiet) {
logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
"valid %s", key_cert_type(public),
out, public->cert->key_id, public->cert->serial,
cert_principals != NULL ? " for " : "",
cert_principals != NULL ? cert_principals : "",
fmt_validity(cert_valid_from, cert_valid_to));
}
key_free(public);
xfree(out);
}
pkcs11_terminate();
exit(0);
}
static u_int64_t
parse_relative_time(const char *s, time_t now)
{
int64_t mul, secs;
mul = *s == '-' ? -1 : 1;
if ((secs = convtime(s + 1)) == -1)
fatal("Invalid relative certificate time %s", s);
if (mul == -1 && secs > now)
fatal("Certificate time %s cannot be represented", s);
return now + (u_int64_t)(secs * mul);
}
static u_int64_t
parse_absolute_time(const char *s)
{
struct tm tm;
time_t tt;
char buf[32], *fmt;
/*
* POSIX strptime says "The application shall ensure that there
* is white-space or other non-alphanumeric characters between
* any two conversion specifications" so arrange things this way.
*/
switch (strlen(s)) {
case 8:
fmt = "%Y-%m-%d";
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
break;
case 14:
fmt = "%Y-%m-%dT%H:%M:%S";
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
s, s + 4, s + 6, s + 8, s + 10, s + 12);
break;
default:
fatal("Invalid certificate time format %s", s);
}
bzero(&tm, sizeof(tm));
if (strptime(buf, fmt, &tm) == NULL)
fatal("Invalid certificate time %s", s);
if ((tt = mktime(&tm)) < 0)
fatal("Certificate time %s cannot be represented", s);
return (u_int64_t)tt;
}
static void
parse_cert_times(char *timespec)
{
char *from, *to;
time_t now = time(NULL);
int64_t secs;
/* +timespec relative to now */
if (*timespec == '+' && strchr(timespec, ':') == NULL) {
if ((secs = convtime(timespec + 1)) == -1)
fatal("Invalid relative certificate life %s", timespec);
cert_valid_to = now + secs;
/*
* Backdate certificate one minute to avoid problems on hosts
* with poorly-synchronised clocks.
*/
cert_valid_from = ((now - 59)/ 60) * 60;
return;
}
/*
* from:to, where
* from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
* to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
*/
from = xstrdup(timespec);
to = strchr(from, ':');
if (to == NULL || from == to || *(to + 1) == '\0')
fatal("Invalid certificate life specification %s", timespec);
*to++ = '\0';
if (*from == '-' || *from == '+')
cert_valid_from = parse_relative_time(from, now);
else
cert_valid_from = parse_absolute_time(from);
if (*to == '-' || *to == '+')
cert_valid_to = parse_relative_time(to, cert_valid_from);
else
cert_valid_to = parse_absolute_time(to);
if (cert_valid_to <= cert_valid_from)
fatal("Empty certificate validity interval");
xfree(from);
}
static void
add_cert_option(char *opt)
{
char *val;
if (strcmp(opt, "clear") == 0)
certflags_flags = 0;
else if (strcasecmp(opt, "no-x11-forwarding") == 0)
certflags_flags &= ~CERTOPT_X_FWD;
else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
certflags_flags |= CERTOPT_X_FWD;
else if (strcasecmp(opt, "no-agent-forwarding") == 0)
certflags_flags &= ~CERTOPT_AGENT_FWD;
else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
certflags_flags |= CERTOPT_AGENT_FWD;
else if (strcasecmp(opt, "no-port-forwarding") == 0)
certflags_flags &= ~CERTOPT_PORT_FWD;
else if (strcasecmp(opt, "permit-port-forwarding") == 0)
certflags_flags |= CERTOPT_PORT_FWD;
else if (strcasecmp(opt, "no-pty") == 0)
certflags_flags &= ~CERTOPT_PTY;
else if (strcasecmp(opt, "permit-pty") == 0)
certflags_flags |= CERTOPT_PTY;
else if (strcasecmp(opt, "no-user-rc") == 0)
certflags_flags &= ~CERTOPT_USER_RC;
else if (strcasecmp(opt, "permit-user-rc") == 0)
certflags_flags |= CERTOPT_USER_RC;
else if (strncasecmp(opt, "force-command=", 14) == 0) {
val = opt + 14;
if (*val == '\0')
fatal("Empty force-command option");
if (certflags_command != NULL)
fatal("force-command already specified");
certflags_command = xstrdup(val);
} else if (strncasecmp(opt, "source-address=", 15) == 0) {
val = opt + 15;
if (*val == '\0')
fatal("Empty source-address option");
if (certflags_src_addr != NULL)
fatal("source-address already specified");
if (addr_match_cidr_list(NULL, val) != 0)
fatal("Invalid source-address list");
certflags_src_addr = xstrdup(val);
} else
fatal("Unsupported certificate option \"%s\"", opt);
}
static void
show_options(const Buffer *optbuf, int v00, int in_critical)
{
u_char *name, *data;
u_int dlen;
Buffer options, option;
buffer_init(&options);
buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf));
buffer_init(&option);
while (buffer_len(&options) != 0) {
name = buffer_get_string(&options, NULL);
data = buffer_get_string_ptr(&options, &dlen);
buffer_append(&option, data, dlen);
printf(" %s", name);
if ((v00 || !in_critical) &&
(strcmp(name, "permit-X11-forwarding") == 0 ||
strcmp(name, "permit-agent-forwarding") == 0 ||
strcmp(name, "permit-port-forwarding") == 0 ||
strcmp(name, "permit-pty") == 0 ||
strcmp(name, "permit-user-rc") == 0))
printf("\n");
else if ((v00 || in_critical) &&
(strcmp(name, "force-command") == 0 ||
strcmp(name, "source-address") == 0)) {
data = buffer_get_string(&option, NULL);
printf(" %s\n", data);
xfree(data);
} else {
printf(" UNKNOWN OPTION (len %u)\n",
buffer_len(&option));
buffer_clear(&option);
}
xfree(name);
if (buffer_len(&option) != 0)
fatal("Option corrupt: extra data at end");
}
buffer_free(&option);
buffer_free(&options);
}
static void
do_show_cert(struct passwd *pw)
{
Key *key;
struct stat st;
char *key_fp, *ca_fp;
u_int i, v00;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) < 0)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((key = key_load_public(identity_file, NULL)) == NULL)
fatal("%s is not a public key", identity_file);
if (!key_is_cert(key))
fatal("%s is not a certificate", identity_file);
v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00;
key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
ca_fp = key_fingerprint(key->cert->signature_key,
SSH_FP_MD5, SSH_FP_HEX);
printf("%s:\n", identity_file);
printf(" Type: %s %s certificate\n", key_ssh_name(key),
key_cert_type(key));
printf(" Public key: %s %s\n", key_type(key), key_fp);
printf(" Signing CA: %s %s\n",
key_type(key->cert->signature_key), ca_fp);
printf(" Key ID: \"%s\"\n", key->cert->key_id);
if (!v00)
printf(" Serial: %llu\n", key->cert->serial);
printf(" Valid: %s\n",
fmt_validity(key->cert->valid_after, key->cert->valid_before));
printf(" Principals: ");
if (key->cert->nprincipals == 0)
printf("(none)\n");
else {
for (i = 0; i < key->cert->nprincipals; i++)
printf("\n %s",
key->cert->principals[i]);
printf("\n");
}
printf(" Critical Options: ");
if (buffer_len(&key->cert->critical) == 0)
printf("(none)\n");
else {
printf("\n");
show_options(&key->cert->critical, v00, 1);
}
if (!v00) {
printf(" Extensions: ");
if (buffer_len(&key->cert->extensions) == 0)
printf("(none)\n");
else {
printf("\n");
show_options(&key->cert->extensions, v00, 0);
}
}
exit(0);
}
static void
usage(void)
{
fprintf(stderr, "usage: %s [options]\n", __progname);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
fprintf(stderr, " -b bits Number of bits in the key to create.\n");
fprintf(stderr, " -C comment Provide new comment.\n");
fprintf(stderr, " -c Change comment in private and public key files.\n");
#ifdef ENABLE_PKCS11
fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n");
#endif
fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n");
fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
fprintf(stderr, " -f filename Filename of the key file.\n");
fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
fprintf(stderr, " -g Use generic DNS resource record format.\n");
fprintf(stderr, " -H Hash names in known_hosts file.\n");
fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n");
fprintf(stderr, " -I key_id Key identifier to include in certificate.\n");
fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n");
fprintf(stderr, " -L Print the contents of a certificate.\n");
fprintf(stderr, " -l Show fingerprint of key file.\n");
fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n");
fprintf(stderr, " -N phrase Provide new passphrase.\n");
fprintf(stderr, " -n name,... User/host principal names to include in certificate\n");
fprintf(stderr, " -O option Specify a certificate option.\n");
fprintf(stderr, " -P phrase Provide old passphrase.\n");
fprintf(stderr, " -p Change passphrase of private key file.\n");
fprintf(stderr, " -q Quiet.\n");
fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
fprintf(stderr, " -r hostname Print DNS resource record.\n");
fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
fprintf(stderr, " -s ca_key Certify keys with CA key.\n");
fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
fprintf(stderr, " -t type Specify type of key to create.\n");
fprintf(stderr, " -V from:to Specify certificate validity interval.\n");
fprintf(stderr, " -v Verbose.\n");
fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
fprintf(stderr, " -y Read private key file and print public key.\n");
fprintf(stderr, " -z serial Specify a serial number.\n");
exit(1);
}
/*
* Main program for key management.
*/
int
main(int argc, char **argv)
{
char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
char out_file[MAXPATHLEN], *rr_hostname = NULL;
Key *private, *public;
struct passwd *pw;
struct stat st;
int opt, type, fd;
u_int maxbits;
u_int32_t memory = 0, generator_wanted = 0, trials = 100;
int do_gen_candidates = 0, do_screen_candidates = 0;
BIGNUM *start = NULL;
FILE *f;
const char *errstr;
extern int optind;
extern char *optarg;
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
SSLeay_add_all_algorithms();
log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
/* we need this for the home * directory. */
pw = getpwuid(getuid());
if (!pw) {
printf("You don't exist, go away!\n");
exit(1);
}
if (gethostname(hostname, sizeof(hostname)) < 0) {
perror("gethostname");
exit(1);
}
while ((opt = getopt(argc, argv, "degiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:"
"O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) {
switch (opt) {
case 'b':
bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
if (errstr)
fatal("Bits has bad value %s (%s)",
optarg, errstr);
break;
case 'F':
find_host = 1;
rr_hostname = optarg;
break;
case 'H':
hash_hosts = 1;
break;
case 'I':
cert_key_id = optarg;
break;
case 'R':
delete_host = 1;
rr_hostname = optarg;
break;
case 'L':
show_cert = 1;
break;
case 'l':
print_fingerprint = 1;
break;
case 'B':
print_bubblebabble = 1;
break;
case 'm':
if (strcasecmp(optarg, "RFC4716") == 0 ||
strcasecmp(optarg, "ssh2") == 0) {
convert_format = FMT_RFC4716;
break;
}
if (strcasecmp(optarg, "PKCS8") == 0) {
convert_format = FMT_PKCS8;
break;
}
if (strcasecmp(optarg, "PEM") == 0) {
convert_format = FMT_PEM;
break;
}
fatal("Unsupported conversion format \"%s\"", optarg);
case 'n':
cert_principals = optarg;
break;
case 'p':
change_passphrase = 1;
break;
case 'c':
change_comment = 1;
break;
case 'f':
if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
sizeof(identity_file))
fatal("Identity filename too long");
have_identity = 1;
break;
case 'g':
print_generic = 1;
break;
case 'P':
identity_passphrase = optarg;
break;
case 'N':
identity_new_passphrase = optarg;
break;
case 'O':
add_cert_option(optarg);
break;
case 'C':
identity_comment = optarg;
break;
case 'q':
quiet = 1;
break;
case 'e':
case 'x':
/* export key */
convert_to = 1;
break;
case 'h':
cert_key_type = SSH2_CERT_TYPE_HOST;
certflags_flags = 0;
break;
case 'i':
case 'X':
/* import key */
convert_from = 1;
break;
case 'y':
print_public = 1;
break;
case 'd':
key_type_name = "dsa";
break;
case 's':
ca_key_path = optarg;
break;
case 't':
key_type_name = optarg;
break;
case 'D':
pkcs11provider = optarg;
break;
case 'v':
if (log_level == SYSLOG_LEVEL_INFO)
log_level = SYSLOG_LEVEL_DEBUG1;
else {
if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
log_level < SYSLOG_LEVEL_DEBUG3)
log_level++;
}
break;
case 'r':
rr_hostname = optarg;
break;
case 'W':
generator_wanted = (u_int32_t)strtonum(optarg, 1,
UINT_MAX, &errstr);
if (errstr)
fatal("Desired generator has bad value: %s (%s)",
optarg, errstr);
break;
case 'a':
trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
if (errstr)
fatal("Invalid number of trials: %s (%s)",
optarg, errstr);
break;
case 'M':
memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
if (errstr)
fatal("Memory limit is %s: %s", errstr, optarg);
break;
case 'G':
do_gen_candidates = 1;
if (strlcpy(out_file, optarg, sizeof(out_file)) >=
sizeof(out_file))
fatal("Output filename too long");
break;
case 'T':
do_screen_candidates = 1;
if (strlcpy(out_file, optarg, sizeof(out_file)) >=
sizeof(out_file))
fatal("Output filename too long");
break;
case 'S':
/* XXX - also compare length against bits */
if (BN_hex2bn(&start, optarg) == 0)
fatal("Invalid start point.");
break;
case 'V':
parse_cert_times(optarg);
break;
case 'z':
cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr);
if (errstr)
fatal("Invalid serial number: %s", errstr);
break;
case '?':
default:
usage();
}
}
/* reinit */
log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
argv += optind;
argc -= optind;
if (ca_key_path != NULL) {
if (argc < 1) {
printf("Too few arguments.\n");
usage();
}
} else if (argc > 0) {
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 && (delete_host || hash_hosts)) {
printf("Cannot use -l with -D or -R.\n");
usage();
}
if (ca_key_path != NULL) {
if (cert_key_id == NULL)
fatal("Must specify key id (-I) when certifying");
do_ca_sign(pw, argc, argv);
}
if (show_cert)
do_show_cert(pw);
if (delete_host || hash_hosts || find_host)
do_known_hosts(pw, rr_hostname);
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)
do_convert_to(pw);
if (convert_from)
do_convert_from(pw);
if (print_public)
do_print_public(pw);
if (rr_hostname != NULL) {
unsigned int n = 0;
if (have_identity) {
n = do_print_resource_record(pw,
identity_file, rr_hostname);
if (n == 0) {
perror(identity_file);
exit(1);
}
exit(0);
} else {
n += do_print_resource_record(pw,
_PATH_HOST_RSA_KEY_FILE, rr_hostname);
n += do_print_resource_record(pw,
_PATH_HOST_DSA_KEY_FILE, rr_hostname);
if (n == 0)
fatal("no keys found.");
exit(0);
}
}
if (pkcs11provider != NULL)
do_download(pw);
if (do_gen_candidates) {
FILE *out = fopen(out_file, "w");
if (out == NULL) {
error("Couldn't open modulus candidate file \"%s\": %s",
out_file, strerror(errno));
return (1);
}
if (bits == 0)
bits = DEFAULT_BITS;
if (gen_candidates(out, memory, bits, start) != 0)
fatal("modulus candidate generation failed");
return (0);
}
if (do_screen_candidates) {
FILE *in;
FILE *out = fopen(out_file, "w");
if (have_identity && strcmp(identity_file, "-") != 0) {
if ((in = fopen(identity_file, "r")) == NULL) {
fatal("Couldn't open modulus candidate "
"file \"%s\": %s", identity_file,
strerror(errno));
}
} else
in = stdin;
if (out == NULL) {
fatal("Couldn't open moduli file \"%s\": %s",
out_file, strerror(errno));
}
if (prime_test(in, out, trials, generator_wanted) != 0)
fatal("modulus screening failed");
return (0);
}
arc4random_stir();
if (key_type_name == NULL)
key_type_name = "rsa";
type = key_type_from_name(key_type_name);
if (type == KEY_UNSPEC) {
fprintf(stderr, "unknown key type %s\n", key_type_name);
exit(1);
}
if (bits == 0) {
if (type == KEY_DSA)
bits = DEFAULT_BITS_DSA;
else if (type == KEY_ECDSA)
bits = DEFAULT_BITS_ECDSA;
else
bits = DEFAULT_BITS;
}
maxbits = (type == KEY_DSA) ?
OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS;
if (bits > maxbits) {
fprintf(stderr, "key bits exceeds maximum %d\n", maxbits);
exit(1);
}
if (type == KEY_DSA && bits != 1024)
fatal("DSA keys must be 1024 bits");
else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(bits) == -1)
fatal("Invalid ECDSA key length - valid lengths are "
"256, 384 or 521 bits");
if (!quiet)
printf("Generating public/private %s key pair.\n", key_type_name);
private = key_generate(type, bits);
if (private == NULL) {
fprintf(stderr, "key_generate failed\n");
exit(1);
}
public = key_from_private(private);
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, _PATH_SSH_USER_DIR);
if (strstr(identity_file, dotsshdir) != NULL) {
if (stat(dotsshdir, &st) < 0) {
if (errno != ENOENT) {
error("Could not stat %s: %s", dotsshdir,
strerror(errno));
} else if (mkdir(dotsshdir, 0700) < 0) {
error("Could not create directory '%s': %s",
dotsshdir, strerror(errno));
} 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): ", RP_ALLOW_STDIN);
passphrase2 = read_passphrase("Enter same passphrase again: ",
RP_ALLOW_STDIN);
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 comment field for the passphrase. */
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)) {
printf("Saving the key failed: %s.\n", identity_file);
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. */
key_free(private);
arc4random_stir();
if (!quiet)
printf("Your identification has been saved in %s.\n", identity_file);
strlcat(identity_file, ".pub", sizeof(identity_file));
fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1) {
printf("Could not save your public key in %s\n", identity_file);
exit(1);
}
f = fdopen(fd, "w");
if (f == NULL) {
printf("fdopen %s failed\n", identity_file);
exit(1);
}
if (!key_write(public, f))
fprintf(stderr, "write key failed\n");
fprintf(f, " %s\n", comment);
fclose(f);
if (!quiet) {
char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
char *ra = key_fingerprint(public, SSH_FP_MD5,
SSH_FP_RANDOMART);
printf("Your public key has been saved in %s.\n",
identity_file);
printf("The key fingerprint is:\n");
printf("%s %s\n", fp, comment);
printf("The key's randomart image is:\n");
printf("%s\n", ra);
xfree(ra);
xfree(fp);
}
key_free(public);
exit(0);
}
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