-/* $OpenBSD: ssh-keyscan.c,v 1.85 2011/03/15 10:36:02 okan Exp $ */
+/* $OpenBSD: ssh-keyscan.c,v 1.99 2015/01/30 10:44:49 djm Exp $ */
/*
* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
*
#include "includes.h"
+#include <sys/types.h>
#include "openbsd-compat/sys-queue.h"
#include <sys/resource.h>
#ifdef HAVE_SYS_TIME_H
#include <netdb.h>
#include <errno.h>
-#include <setjmp.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
-#include "buffer.h"
-#include "key.h"
+#include "sshbuf.h"
+#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "compat.h"
#include "atomicio.h"
#include "misc.h"
#include "hostfile.h"
+#include "ssherr.h"
+#include "ssh_api.h"
/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
Default value is AF_UNSPEC means both IPv4 and IPv6. */
#define KT_DSA 2
#define KT_RSA 4
#define KT_ECDSA 8
+#define KT_ED25519 16
-int get_keytypes = KT_RSA; /* Get only RSA keys by default */
+int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
int hash_hosts = 0; /* Hash hostname on output */
fd_set *read_wait;
size_t read_wait_nfdset;
int ncon;
-int nonfatal_fatal = 0;
-jmp_buf kexjmp;
-Key *kexjmp_key;
+
+struct ssh *active_state = NULL; /* XXX needed for linking */
/*
* Keep a connection structure for each file descriptor. The state
int c_len; /* Total bytes which must be read. */
int c_off; /* Length of data read so far. */
int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
+ int c_done; /* SSH2 done */
char *c_namebase; /* Address to free for c_name and c_namelist */
char *c_name; /* Hostname of connection for errors */
char *c_namelist; /* Pointer to other possible addresses */
char *c_output_name; /* Hostname of connection for output */
char *c_data; /* Data read from this fd */
- Kex *c_kex; /* The key-exchange struct for ssh2 */
+ struct ssh *c_ssh; /* SSH-connection */
struct timeval c_tv; /* Time at which connection gets aborted */
TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
} con;
TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
con *fdcon;
+static void keyprint(con *c, struct sshkey *key);
+
static int
fdlim_get(int hard)
{
return (tok);
}
-static Key *
+#ifdef WITH_SSH1
+static struct sshkey *
keygrab_ssh1(con *c)
{
- static Key *rsa;
- static Buffer msg;
+ static struct sshkey *rsa;
+ static struct sshbuf *msg;
+ int r;
+ u_char type;
if (rsa == NULL) {
- buffer_init(&msg);
- rsa = key_new(KEY_RSA1);
+ if ((rsa = sshkey_new(KEY_RSA1)) == NULL) {
+ error("%s: sshkey_new failed", __func__);
+ return NULL;
+ }
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
}
- buffer_append(&msg, c->c_data, c->c_plen);
- buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
- if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
+ if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 ||
+ (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */
+ (r = sshbuf_get_u8(msg, &type)) != 0)
+ goto buf_err;
+ if (type != (int) SSH_SMSG_PUBLIC_KEY) {
error("%s: invalid packet type", c->c_name);
- buffer_clear(&msg);
+ sshbuf_reset(msg);
+ return NULL;
+ }
+ if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */
+ /* server key */
+ (r = sshbuf_get_u32(msg, NULL)) != 0 ||
+ (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
+ (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
+ /* host key */
+ (r = sshbuf_get_u32(msg, NULL)) != 0 ||
+ (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 ||
+ (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) {
+ buf_err:
+ error("%s: buffer error: %s", __func__, ssh_err(r));
+ sshbuf_reset(msg);
return NULL;
}
- buffer_consume(&msg, 8); /* cookie */
-
- /* server key */
- (void) buffer_get_int(&msg);
- buffer_get_bignum(&msg, rsa->rsa->e);
- buffer_get_bignum(&msg, rsa->rsa->n);
-
- /* host key */
- (void) buffer_get_int(&msg);
- buffer_get_bignum(&msg, rsa->rsa->e);
- buffer_get_bignum(&msg, rsa->rsa->n);
- buffer_clear(&msg);
+ sshbuf_reset(msg);
return (rsa);
}
+#endif
static int
-hostjump(Key *hostkey)
+key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
{
- kexjmp_key = hostkey;
- longjmp(kexjmp, 1);
+ con *c;
+
+ if ((c = ssh_get_app_data(ssh)) != NULL)
+ keyprint(c, hostkey);
+ /* always abort key exchange */
+ return -1;
}
static int
return 0;
}
-static Key *
+static void
keygrab_ssh2(con *c)
{
- int j;
+ char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
+ int r;
- packet_set_connection(c->c_fd, c->c_fd);
enable_compat20();
- myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
- "ssh-dss" : (c->c_keytype == KT_RSA ? "ssh-rsa" :
- "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521");
- c->c_kex = kex_setup(myproposal);
- c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
- c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
- c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
- c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
- c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
- c->c_kex->verify_host_key = hostjump;
-
- if (!(j = setjmp(kexjmp))) {
- nonfatal_fatal = 1;
- dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
- fprintf(stderr, "Impossible! dispatch_run() returned!\n");
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
+ c->c_keytype == KT_DSA ? "ssh-dss" :
+ (c->c_keytype == KT_RSA ? "ssh-rsa" :
+ (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
+ "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
+ if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
+ free(c->c_ssh);
+ fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
exit(1);
}
- nonfatal_fatal = 0;
- xfree(c->c_kex);
- c->c_kex = NULL;
- packet_close();
-
- return j < 0? NULL : kexjmp_key;
+#ifdef WITH_OPENSSL
+ c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
+ c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
+ c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
+ c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
+# ifdef OPENSSL_HAS_ECC
+ c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
+# endif
+#endif
+ c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
+ ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
+ /*
+ * do the key-exchange until an error occurs or until
+ * the key_print_wrapper() callback sets c_done.
+ */
+ ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
}
static void
-keyprint(con *c, Key *key)
+keyprint(con *c, struct sshkey *key)
{
char *host = c->c_output_name ? c->c_output_name : c->c_name;
fatal("host_hash failed");
fprintf(stdout, "%s ", host);
- key_write(key, stdout);
+ sshkey_write(key, stdout);
fputs("\n", stdout);
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = IPv4or6;
hints.ai_socktype = SOCK_STREAM;
- if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
- fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
+ if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
+ error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
+ return -1;
+ }
for (ai = aitop; ai; ai = ai->ai_next) {
s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s < 0) {
do {
name = xstrsep(&namelist, ",");
if (!name) {
- xfree(namebase);
+ free(namebase);
return (-1);
}
} while ((s = tcpconnect(name)) < 0);
if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
fatal("confree: attempt to free bad fdno %d", s);
close(s);
- xfree(fdcon[s].c_namebase);
- xfree(fdcon[s].c_output_name);
+ free(fdcon[s].c_namebase);
+ free(fdcon[s].c_output_name);
if (fdcon[s].c_status == CS_KEYS)
- xfree(fdcon[s].c_data);
+ free(fdcon[s].c_data);
fdcon[s].c_status = CS_UNUSED;
fdcon[s].c_keytype = 0;
+ if (fdcon[s].c_ssh) {
+ ssh_packet_close(fdcon[s].c_ssh);
+ free(fdcon[s].c_ssh);
+ fdcon[s].c_ssh = NULL;
+ }
TAILQ_REMOVE(&tq, &fdcon[s], c_link);
FD_CLR(s, read_wait);
ncon--;
return;
}
*cp = '\0';
+ if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
+ fatal("ssh_packet_set_connection failed");
+ ssh_packet_set_timeout(c->c_ssh, timeout, 1);
+ ssh_set_app_data(c->c_ssh, c); /* back link */
if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
&remote_major, &remote_minor, remote_version) == 3)
- compat_datafellows(remote_version);
+ c->c_ssh->compat = compat_datafellows(remote_version);
else
- datafellows = 0;
+ c->c_ssh->compat = 0;
if (c->c_keytype != KT_RSA1) {
if (!ssh2_capable(remote_major, remote_minor)) {
debug("%s doesn't support ssh2", c->c_name);
return;
}
if (c->c_keytype != KT_RSA1) {
- keyprint(c, keygrab_ssh2(c));
+ keygrab_ssh2(c);
confree(s);
return;
}
c->c_data = xmalloc(c->c_len);
c->c_status = CS_KEYS;
break;
+#ifdef WITH_SSH1
case CS_KEYS:
keyprint(c, keygrab_ssh1(c));
confree(s);
return;
+#endif
default:
fatal("conread: invalid status %d", c->c_status);
break;
} else if (FD_ISSET(i, r))
conread(i);
}
- xfree(r);
- xfree(e);
+ free(r);
+ free(e);
c = TAILQ_FIRST(&tq);
while (c && (c->c_tv.tv_sec < now.tv_sec ||
if (name == NULL)
return;
- for (j = KT_RSA1; j <= KT_ECDSA; j *= 2) {
+ for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
if (get_keytypes & j) {
while (ncon >= MAXCON)
conloop();
va_start(args, fmt);
do_log(SYSLOG_LEVEL_FATAL, fmt, args);
va_end(args);
- if (nonfatal_fatal)
- longjmp(kexjmp, -1);
- else
- exit(255);
+ exit(255);
}
static void
get_keytypes = 0;
tname = strtok(optarg, ",");
while (tname) {
- int type = key_type_from_name(tname);
+ int type = sshkey_type_from_name(tname);
switch (type) {
case KEY_RSA1:
get_keytypes |= KT_RSA1;
case KEY_RSA:
get_keytypes |= KT_RSA;
break;
+ case KEY_ED25519:
+ get_keytypes |= KT_ED25519;
+ break;
case KEY_UNSPEC:
fatal("unknown key type %s", tname);
}
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