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Add "ssh-keyscan -c ..." flag to allow fetching
 certificates instead of plain keys; ok markus@

Upstream-ID: 0947e2177dba92339eced9e49d3c5bf7dda69f82
This commit is contained in:
djm@openbsd.org 2015-11-08 22:30:20 +00:00 committed by Damien Miller
parent 69fead5d7c
commit 3a424cdd21
2 changed files with 42 additions and 13 deletions
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8
ssh-keyscan.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: ssh-keyscan.1,v 1.36 2014/08/30 15:33:50 sobrado Exp $
.\" $OpenBSD: ssh-keyscan.1,v 1.37 2015/11/08 22:30:20 djm Exp $
.\"
.\" Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
.\"
@ -6,7 +6,7 @@
.\" permitted provided that due credit is given to the author and the
.\" OpenBSD project by leaving this copyright notice intact.
.\"
.Dd $Mdocdate: August 30 2014 $
.Dd $Mdocdate: November 8 2015 $
.Dt SSH-KEYSCAN 1
.Os
.Sh NAME
@ -15,7 +15,7 @@
.Sh SYNOPSIS
.Nm ssh-keyscan
.Bk -words
.Op Fl 46Hv
.Op Fl 46Hcv
.Op Fl f Ar file
.Op Fl p Ar port
.Op Fl T Ar timeout
@ -54,6 +54,8 @@ to use IPv4 addresses only.
Forces
.Nm
to use IPv6 addresses only.
.It Fl c
Request certificates from target hosts instead of plain keys.
.It Fl f Ar file
Read hosts or
.Dq addrlist namelist

47
ssh-keyscan.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keyscan.c,v 1.102 2015/10/24 22:56:19 djm Exp $ */
/* $OpenBSD: ssh-keyscan.c,v 1.103 2015/11/08 22:30:20 djm Exp $ */
/*
* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
*
@ -60,6 +60,7 @@ int ssh_port = SSH_DEFAULT_PORT;
#define KT_ECDSA 8
#define KT_ED25519 16
int get_cert = 0;
int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
int hash_hosts = 0; /* Hash hostname on output */
@ -267,11 +268,32 @@ keygrab_ssh2(con *c)
int r;
enable_compat20();
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"));
switch (c->c_keytype) {
case KT_DSA:
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
"ssh-dss-cert-v01@openssh.com" : "ssh-dss";
break;
case KT_RSA:
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
"ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
break;
case KT_ED25519:
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
"ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
break;
case KT_ECDSA:
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
"ecdsa-sha2-nistp256-cert-v01@openssh.com,"
"ecdsa-sha2-nistp384-cert-v01@openssh.com,"
"ecdsa-sha2-nistp521-cert-v01@openssh.com" :
"ecdsa-sha2-nistp256,"
"ecdsa-sha2-nistp384,"
"ecdsa-sha2-nistp521";
break;
default:
fatal("unknown key type %d", c->c_keytype);
break;
}
if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
free(c->c_ssh);
fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
@ -304,7 +326,8 @@ keyprint_one(char *host, struct sshkey *key)
fatal("host_hash failed");
hostport = put_host_port(host, ssh_port);
fprintf(stdout, "%s ", hostport);
if (!get_cert)
fprintf(stdout, "%s ", hostport);
sshkey_write(key, stdout);
fputs("\n", stdout);
free(hostport);
@ -318,7 +341,7 @@ keyprint(con *c, struct sshkey *key)
if (key == NULL)
return;
if (!hash_hosts && ssh_port == SSH_DEFAULT_PORT) {
if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
keyprint_one(hosts, key);
return;
}
@ -384,6 +407,7 @@ conalloc(char *iname, char *oname, int keytype)
if (fdcon[s].c_status)
fatal("conalloc: attempt to reuse fdno %d", s);
debug3("%s: oname %s kt %d", __func__, oname, keytype);
fdcon[s].c_fd = s;
fdcon[s].c_status = CS_CON;
fdcon[s].c_namebase = namebase;
@ -654,7 +678,7 @@ static void
usage(void)
{
fprintf(stderr,
"usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
"usage: %s [-46Hcv] [-f file] [-p port] [-T timeout] [-t type]\n"
"\t\t [host | addrlist namelist] ...\n",
__progname);
exit(1);
@ -682,11 +706,14 @@ main(int argc, char **argv)
if (argc <= 1)
usage();
while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) {
switch (opt) {
case 'H':
hash_hosts = 1;
break;
case 'c':
get_cert = 1;
break;
case 'p':
ssh_port = a2port(optarg);
if (ssh_port <= 0) {