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ssh-keygen.c
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/* $OpenBSD: ssh-keygen.c,v 1.205 2011/01/11 06:13:10 djm Exp $ */
/*
* Author: Tatu Ylonen <[email protected]>
* Copyright (c) 1994 Tatu Ylonen <[email protected]>, 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"
#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 "openbsd-compat/openssl-compat.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
#include <pwd.h>
#include <stdarg.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 256
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;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA_CERT:
case KEY_ECDSA:
name = _PATH_SSH_CLIENT_ID_ECDSA;
break;
#endif
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;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
fatal("PEM_write_EC_PUBKEY failed");
break;
#endif
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;
#ifdef OPENSSL_HAS_ECC
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_key_to_nid((*k)->ecdsa);
break;
#endif
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;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
NULL, 0, NULL, NULL);
break;
#endif
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);