- markus@cvs.openbsd.org 2001/10/01 21:51:16

[readconf.c readconf.h ssh.1 sshconnect.c]
     add NoHostAuthenticationForLocalhost; note that the hostkey is
     now check for localhost, too.

ChangeLog

@@ -27,6 +27,10 @@
    - markus@cvs.openbsd.org 2001/10/01 21:38:53
      [channels.c channels.h ssh.c sshd.c]
      remove ugliness; vp@drexel.edu via angelos
+   - markus@cvs.openbsd.org 2001/10/01 21:51:16
+     [readconf.c readconf.h ssh.1 sshconnect.c]
+     add NoHostAuthenticationForLocalhost; note that the hostkey is
+     now check for localhost, too.
 
 20011001
  - (stevesk) loginrec.c: fix type conversion problems exposed when using
@@ -6619,4 +6623,4 @@
  - Wrote replacements for strlcpy and mkdtemp
  - Released 1.0pre1
 
-$Id: ChangeLog,v 1.1577 2001/10/03 17:34:59 mouring Exp $
+$Id: ChangeLog,v 1.1578 2001/10/03 17:39:38 mouring Exp $

readconf.c

@@ -12,7 +12,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: readconf.c,v 1.90 2001/09/19 19:24:18 stevesk Exp $");
+RCSID("$OpenBSD: readconf.c,v 1.91 2001/10/01 21:51:16 markus Exp $");
 
 #include "ssh.h"
 #include "xmalloc.h"
@@ -115,7 +115,7 @@ typedef enum {
 	oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
 	oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
 	oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
-	oClearAllForwardings
+	oClearAllForwardings, oNoHostAuthenticationForLocalhost 
 } OpCodes;
 
 /* Textual representations of the tokens. */
@@ -186,6 +186,7 @@ static struct {
 	{ "bindaddress", oBindAddress },
 	{ "smartcarddevice", oSmartcardDevice },
 	{ "clearallforwardings", oClearAllForwardings }, 
+	{ "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, 
 	{ NULL, 0 }
 };
 
@@ -415,6 +416,10 @@ parse_flag:
 		intptr = &options->keepalives;
 		goto parse_flag;
 
+	case oNoHostAuthenticationForLocalhost:
+		intptr = &options->no_host_authentication_for_localhost;
+		goto parse_flag;
+
 	case oNumberOfPasswordPrompts:
 		intptr = &options->number_of_password_prompts;
 		goto parse_int;
@@ -793,6 +798,7 @@ initialize_options(Options * options)
 	options->preferred_authentications = NULL;
 	options->bind_address = NULL;
 	options->smartcard_device = NULL;
+	options->no_host_authentication_for_localhost = - 1;
 }
 
 /*
@@ -911,6 +917,8 @@ fill_default_options(Options * options)
 		options->log_level = SYSLOG_LEVEL_INFO;
 	if (options->clear_forwardings == 1)
 		clear_forwardings(options);
+	if (options->no_host_authentication_for_localhost == - 1)
+		options->no_host_authentication_for_localhost = 0;
 	/* options->proxy_command should not be set by default */
 	/* options->user will be set in the main program if appropriate */
 	/* options->hostname will be set in the main program if appropriate */

readconf.h

@@ -11,7 +11,7 @@
  * called by a name other than "ssh" or "Secure Shell".
  */
 
-/* RCSID("$OpenBSD: readconf.h,v 1.39 2001/09/19 19:24:18 stevesk Exp $"); */
+/* RCSID("$OpenBSD: readconf.h,v 1.40 2001/10/01 21:51:16 markus Exp $"); */
 
 #ifndef READCONF_H
 #define READCONF_H
@@ -101,6 +101,7 @@ typedef struct {
 	int     num_remote_forwards;
 	Forward remote_forwards[SSH_MAX_FORWARDS_PER_DIRECTION];
 	int	clear_forwardings;
+	int	no_host_authentication_for_localhost;
 }       Options;
 
 

ssh.1

@@ -34,7 +34,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh.1,v 1.138 2001/09/19 19:24:19 stevesk Exp $
+.\" $OpenBSD: ssh.1,v 1.139 2001/10/01 21:51:16 markus Exp $
 .Dd September 25, 1999
 .Dt SSH 1
 .Os
@@ -981,6 +981,16 @@ for data integrity protection.
 Multiple algorithms must be comma-separated.
 The default is
 .Dq hmac-md5,hmac-sha1,hmac-ripemd160,hmac-sha1-96,hmac-md5-96 .
+.It Cm NoHostAuthenticationForLocalhost
+This option can be used if the home directory is shared across machines.
+In this case localhost will refer to a different machine on each of
+the machines and the user will get many warnings about changed host keys.
+However, this option disables host authentication for localhost.
+The argument to this keyword must be
+.Dq yes
+or
+.Dq no .
+The default is to check the host key for localhost.
 .It Cm NumberOfPasswordPrompts
 Specifies the number of password prompts before giving up.
 The argument to this keyword must be an integer.

sshconnect.c

@@ -13,7 +13,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: sshconnect.c,v 1.110 2001/07/25 14:35:18 markus Exp $");
+RCSID("$OpenBSD: sshconnect.c,v 1.111 2001/10/01 21:51:16 markus Exp $");
 
 #include <openssl/bn.h>
 
@@ -587,7 +587,8 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
 		salen = sizeof(struct sockaddr_storage);
 		break;
 	}
-	if (local && options.host_key_alias == NULL) {
+	if (options.no_host_authentication_for_localhost == 1 && local &&
+	    options.host_key_alias == NULL) {
 		debug("Forcing accepting of host key for "
 		    "loopback/localhost.");
 		return 0;