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@@ -1,448 +0,0 @@
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-From 1dc5659aa62848f0aeb5de7bd3839fecc7debefa Mon Sep 17 00:00:00 2001
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-From: Simon Tatham <anakin@pobox.com>
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-Date: Sat, 19 Jun 2021 15:39:15 +0100
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-Subject: [PATCH] New option to reject 'trivial' success of userauth.
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-
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-Suggested by Manfred Kaiser, who also wrote most of this patch
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-(although outlying parts, like documentation and SSH-1 support, are by
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-me).
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-
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-This is a second line of defence against the kind of spoofing attacks
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-in which a malicious or compromised SSH server rushes the client
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-through the userauth phase of SSH without actually requiring any auth
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-inputs (passwords or signatures or whatever), and then at the start of
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-the connection phase it presents something like a spoof prompt,
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-intended to be taken for part of userauth by the user but in fact with
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-some more sinister purpose.
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-
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-Our existing line of defence against this is the trust sigil system,
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-and as far as I know, that's still working. This option allows a bit of
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-extra defence in depth: if you don't expect your SSH server to
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-trivially accept authentication in the first place, then enabling this
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-option will cause PuTTY to disconnect if it unexpectedly does so,
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-without the user having to spot the presence or absence of a fiddly
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-little sigil anywhere.
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-
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-Several types of authentication count as 'trivial'. The obvious one is
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-the SSH-2 "none" method, which clients always try first so that the
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-failure message will tell them what else they can try, and which a
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-server can instead accept in order to authenticate you unconditionally.
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-But there are two other ways to do it that we know of: one is to run
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-keyboard-interactive authentication and send an empty INFO_REQUEST
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-packet containing no actual prompts for the user, and another even
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-weirder one is to send USERAUTH_SUCCESS in response to the user's
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-preliminary *offer* of a public key (instead of sending the usual PK_OK
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-to request an actual signature from the key).
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-
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-This new option detects all of those, by clearing the 'is_trivial_auth'
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-flag only when we send some kind of substantive authentication response
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-(be it a password, a k-i prompt response, a signature, or a GSSAPI
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-token). So even if there's a further path through the userauth maze we
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-haven't spotted, that somehow avoids sending anything substantive, this
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-strategy should still pick it up.
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-
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-(cherry picked from commit 5f5c710cf3704737e24ffceb2c918e412a2a674f)
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-
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-[Retrieved from:
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-https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa]
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-Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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----
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- cmdline.c | 8 ++++++++
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- config.c | 4 ++++
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- doc/config.but | 43 +++++++++++++++++++++++++++++++++++++++++++
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- pscp.c | 2 ++
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- psftp.c | 2 ++
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- putty.h | 1 +
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- settings.c | 2 ++
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- ssh.c | 4 +++-
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- ssh1login.c | 14 +++++++++++++-
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- ssh2userauth.c | 20 ++++++++++++++++----
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- sshppl.h | 2 +-
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- unix/uxplink.c | 2 ++
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- windows/winhelp.h | 1 +
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- windows/winplink.c | 2 ++
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- 14 files changed, 100 insertions(+), 7 deletions(-)
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-
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-diff --git a/cmdline.c b/cmdline.c
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-index 7ea5cacc..62d65e19 100644
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---- a/cmdline.c
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-+++ b/cmdline.c
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-@@ -598,6 +598,14 @@ int cmdline_process_param(const char *p, char *value,
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- SAVEABLE(0);
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- conf_set_bool(conf, CONF_tryagent, false);
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- }
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-+
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-+ if (!strcmp(p, "-no-trivial-auth")) {
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-+ RETURN(1);
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-+ UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
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-+ SAVEABLE(0);
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-+ conf_set_bool(conf, CONF_ssh_no_trivial_userauth, true);
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-+ }
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-+
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- if (!strcmp(p, "-share")) {
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- RETURN(1);
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- UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
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-diff --git a/config.c b/config.c
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-index ca808511..b8348530 100644
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---- a/config.c
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-+++ b/config.c
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-@@ -2772,6 +2772,10 @@ void setup_config_box(struct controlbox *b, bool midsession,
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- HELPCTX(ssh_auth_bypass),
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- conf_checkbox_handler,
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- I(CONF_ssh_no_userauth));
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-+ ctrl_checkbox(s, "Disconnect if authentication succeeds trivially",
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-+ 'n', HELPCTX(ssh_no_trivial_userauth),
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-+ conf_checkbox_handler,
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-+ I(CONF_ssh_no_trivial_userauth));
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-
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- s = ctrl_getset(b, "Connection/SSH/Auth", "methods",
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- "Authentication methods");
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-diff --git a/doc/config.but b/doc/config.but
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-index a00ae476..77313282 100644
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---- a/doc/config.but
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-+++ b/doc/config.but
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-@@ -2623,6 +2623,49 @@ interact with them.)
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- This option only affects SSH-2 connections. SSH-1 connections always
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- require an authentication step.
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-
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-+\S{config-ssh-notrivialauth} \q{Disconnect if authentication succeeds
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-+trivially}
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-+
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-+This option causes PuTTY to abandon an SSH session and disconnect from
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-+the server, if the server accepted authentication without ever having
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-+asked for any kind of password or signature or token.
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-+
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-+This might be used as a security measure. There are some forms of
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-+attack against an SSH client user which work by terminating the SSH
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-+authentication stage early, and then doing something in the main part
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-+of the SSH session which \e{looks} like part of the authentication,
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-+but isn't really.
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-+
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-+For example, instead of demanding a signature from your public key,
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-+for which PuTTY would ask for your key's passphrase, a compromised or
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-+malicious server might allow you to log in with no signature or
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-+password at all, and then print a message that \e{imitates} PuTTY's
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-+request for your passphrase, in the hope that you would type it in.
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-+(In fact, the passphrase for your public key should not be sent to any
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-+server.)
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-+
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-+PuTTY's main defence against attacks of this type is the \q{trust
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-+sigil} system: messages in the PuTTY window that are truly originated
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-+by PuTTY itself are shown next to a small copy of the PuTTY icon,
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-+which the server cannot fake when it tries to imitate the same message
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-+using terminal output.
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-+
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-+However, if you think you might be at risk of this kind of thing
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-+anyway (if you don't watch closely for the trust sigils, or if you
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-+think you're at extra risk of one of your servers being malicious),
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-+then you could enable this option as an extra defence. Then, if the
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-+server tries any of these attacks involving letting you through the
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-+authentication stage, PuTTY will disconnect from the server before it
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-+can send a follow-up fake prompt or other type of attack.
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-+
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-+On the other hand, some servers \e{legitimately} let you through the
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-+SSH authentication phase trivially, either because they are genuinely
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-+public, or because the important authentication step happens during
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-+the terminal session. (An example might be an SSH server that connects
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-+you directly to the terminal login prompt of a legacy mainframe.) So
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-+enabling this option might cause some kinds of session to stop
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-+working. It's up to you.
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-+
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- \S{config-ssh-tryagent} \q{Attempt authentication using Pageant}
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-
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- If this option is enabled, then PuTTY will look for Pageant (the SSH
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-diff --git a/pscp.c b/pscp.c
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-index 0bfda92d..a11d1e18 100644
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---- a/pscp.c
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-+++ b/pscp.c
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-@@ -2203,6 +2203,8 @@ static void usage(void)
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- printf(" -i key private key file for user authentication\n");
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- printf(" -noagent disable use of Pageant\n");
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- printf(" -agent enable use of Pageant\n");
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-+ printf(" -no-trivial-auth\n");
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-+ printf(" disconnect if SSH authentication succeeds trivially\n");
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- printf(" -hostkey keyid\n");
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- printf(" manually specify a host key (may be repeated)\n");
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- printf(" -batch disable all interactive prompts\n");
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-diff --git a/psftp.c b/psftp.c
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-index 40cb73f5..c4b5374b 100644
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---- a/psftp.c
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-+++ b/psftp.c
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-@@ -2538,6 +2538,8 @@ static void usage(void)
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- printf(" -i key private key file for user authentication\n");
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- printf(" -noagent disable use of Pageant\n");
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- printf(" -agent enable use of Pageant\n");
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-+ printf(" -no-trivial-auth\n");
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-+ printf(" disconnect if SSH authentication succeeds trivially\n");
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- printf(" -hostkey keyid\n");
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- printf(" manually specify a host key (may be repeated)\n");
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- printf(" -batch disable all interactive prompts\n");
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-diff --git a/putty.h b/putty.h
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-index ef6f7a37..7789f217 100644
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---- a/putty.h
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-+++ b/putty.h
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-@@ -1428,6 +1428,7 @@ NORETURN void cleanup_exit(int);
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- X(INT, NONE, sshprot) \
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- X(BOOL, NONE, ssh2_des_cbc) /* "des-cbc" unrecommended SSH-2 cipher */ \
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- X(BOOL, NONE, ssh_no_userauth) /* bypass "ssh-userauth" (SSH-2 only) */ \
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-+ X(BOOL, NONE, ssh_no_trivial_userauth) /* disable trivial types of auth */ \
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- X(BOOL, NONE, ssh_show_banner) /* show USERAUTH_BANNERs (SSH-2 only) */ \
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- X(BOOL, NONE, try_tis_auth) \
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- X(BOOL, NONE, try_ki_auth) \
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-diff --git a/settings.c b/settings.c
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-index 547af0dc..32a53c54 100644
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---- a/settings.c
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-+++ b/settings.c
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-@@ -609,6 +609,7 @@ void save_open_settings(settings_w *sesskey, Conf *conf)
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- #endif
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- write_setting_s(sesskey, "RekeyBytes", conf_get_str(conf, CONF_ssh_rekey_data));
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- write_setting_b(sesskey, "SshNoAuth", conf_get_bool(conf, CONF_ssh_no_userauth));
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-+ write_setting_b(sesskey, "SshNoTrivialAuth", conf_get_bool(conf, CONF_ssh_no_trivial_userauth));
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- write_setting_b(sesskey, "SshBanner", conf_get_bool(conf, CONF_ssh_show_banner));
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- write_setting_b(sesskey, "AuthTIS", conf_get_bool(conf, CONF_try_tis_auth));
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- write_setting_b(sesskey, "AuthKI", conf_get_bool(conf, CONF_try_ki_auth));
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-@@ -1025,6 +1026,7 @@ void load_open_settings(settings_r *sesskey, Conf *conf)
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- gpps(sesskey, "LogHost", "", conf, CONF_loghost);
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- gppb(sesskey, "SSH2DES", false, conf, CONF_ssh2_des_cbc);
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- gppb(sesskey, "SshNoAuth", false, conf, CONF_ssh_no_userauth);
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-+ gppb(sesskey, "SshNoTrivialAuth", false, conf, CONF_ssh_no_trivial_userauth);
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- gppb(sesskey, "SshBanner", true, conf, CONF_ssh_show_banner);
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- gppb(sesskey, "AuthTIS", false, conf, CONF_try_tis_auth);
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- gppb(sesskey, "AuthKI", true, conf, CONF_try_ki_auth);
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-diff --git a/ssh.c b/ssh.c
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-index 00a516ea..91e7e869 100644
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---- a/ssh.c
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-+++ b/ssh.c
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-@@ -254,7 +254,9 @@ static void ssh_got_ssh_version(struct ssh_version_receiver *rcv,
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- connection_layer, ssh->savedhost, ssh->fullhostname,
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- conf_get_filename(ssh->conf, CONF_keyfile),
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- conf_get_bool(ssh->conf, CONF_ssh_show_banner),
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-- conf_get_bool(ssh->conf, CONF_tryagent), username,
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-+ conf_get_bool(ssh->conf, CONF_tryagent),
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-+ conf_get_bool(ssh->conf, CONF_ssh_no_trivial_userauth),
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-+ username,
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- conf_get_bool(ssh->conf, CONF_change_username),
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- conf_get_bool(ssh->conf, CONF_try_ki_auth),
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- #ifndef NO_GSSAPI
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-diff --git a/ssh1login.c b/ssh1login.c
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-index 8486cbf0..519838d7 100644
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---- a/ssh1login.c
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-+++ b/ssh1login.c
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-@@ -27,7 +27,7 @@ struct ssh1_login_state {
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-
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- char *savedhost;
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- int savedport;
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-- bool try_agent_auth;
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-+ bool try_agent_auth, is_trivial_auth;
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-
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- int remote_protoflags;
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- int local_protoflags;
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-@@ -105,6 +105,8 @@ PacketProtocolLayer *ssh1_login_new(
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- s->savedhost = dupstr(host);
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- s->savedport = port;
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- s->successor_layer = successor_layer;
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-+ s->is_trivial_auth = true;
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-+
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- return &s->ppl;
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- }
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-
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-@@ -645,6 +647,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
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- s->ppl.bpp, SSH1_CMSG_AUTH_RSA_RESPONSE);
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- put_data(pkt, ret + 5, 16);
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- pq_push(s->ppl.out_pq, pkt);
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-+ s->is_trivial_auth = false;
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- crMaybeWaitUntilV(
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- (pktin = ssh1_login_pop(s))
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- != NULL);
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-@@ -814,6 +817,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
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- s->ppl.bpp, SSH1_CMSG_AUTH_RSA_RESPONSE);
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- put_data(pkt, buffer, 16);
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- pq_push(s->ppl.out_pq, pkt);
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-+ s->is_trivial_auth = false;
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-
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- mp_free(challenge);
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- mp_free(response);
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-@@ -1105,6 +1109,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
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- put_stringz(pkt, prompt_get_result_ref(s->cur_prompt->prompts[0]));
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- pq_push(s->ppl.out_pq, pkt);
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- }
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-+ s->is_trivial_auth = false;
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- ppl_logevent("Sent password");
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- free_prompts(s->cur_prompt);
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- s->cur_prompt = NULL;
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-@@ -1121,6 +1126,13 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
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- }
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- }
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-
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-+ if (conf_get_bool(s->conf, CONF_ssh_no_trivial_userauth) &&
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-+ s->is_trivial_auth) {
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-+ ssh_proto_error(s->ppl.ssh, "Authentication was trivial! "
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-+ "Abandoning session as specified in configuration.");
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-+ return;
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-+ }
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-+
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- ppl_logevent("Authentication successful");
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-
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- if (conf_get_bool(s->conf, CONF_compression)) {
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-diff --git a/ssh2userauth.c b/ssh2userauth.c
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-index 01243baf..451d5abe 100644
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---- a/ssh2userauth.c
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-+++ b/ssh2userauth.c
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-@@ -28,7 +28,7 @@ struct ssh2_userauth_state {
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-
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- PacketProtocolLayer *transport_layer, *successor_layer;
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- Filename *keyfile;
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-- bool show_banner, tryagent, change_username;
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-+ bool show_banner, tryagent, notrivialauth, change_username;
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- char *hostname, *fullhostname;
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- char *default_username;
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- bool try_ki_auth, try_gssapi_auth, try_gssapi_kex_auth, gssapi_fwd;
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-@@ -82,6 +82,7 @@ struct ssh2_userauth_state {
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- int len;
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- PktOut *pktout;
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- bool want_user_input;
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-+ bool is_trivial_auth;
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-
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- agent_pending_query *auth_agent_query;
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- bufchain banner;
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-@@ -134,7 +135,7 @@ static const PacketProtocolLayerVtable ssh2_userauth_vtable = {
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- PacketProtocolLayer *ssh2_userauth_new(
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- PacketProtocolLayer *successor_layer,
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- const char *hostname, const char *fullhostname,
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-- Filename *keyfile, bool show_banner, bool tryagent,
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-+ Filename *keyfile, bool show_banner, bool tryagent, bool notrivialauth,
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- const char *default_username, bool change_username,
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- bool try_ki_auth, bool try_gssapi_auth, bool try_gssapi_kex_auth,
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- bool gssapi_fwd, struct ssh_connection_shared_gss_state *shgss)
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-@@ -149,6 +150,7 @@ PacketProtocolLayer *ssh2_userauth_new(
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- s->keyfile = filename_copy(keyfile);
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- s->show_banner = show_banner;
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- s->tryagent = tryagent;
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-+ s->notrivialauth = notrivialauth;
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- s->default_username = dupstr(default_username);
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- s->change_username = change_username;
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- s->try_ki_auth = try_ki_auth;
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-@@ -157,6 +159,7 @@ PacketProtocolLayer *ssh2_userauth_new(
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- s->gssapi_fwd = gssapi_fwd;
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- s->shgss = shgss;
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- s->last_methods_string = strbuf_new();
|
|
|
-+ s->is_trivial_auth = true;
|
|
|
- bufchain_init(&s->banner);
|
|
|
- bufchain_sink_init(&s->banner_bs, &s->banner);
|
|
|
-
|
|
|
-@@ -818,6 +821,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- sigblob);
|
|
|
- pq_push(s->ppl.out_pq, s->pktout);
|
|
|
- s->type = AUTH_TYPE_PUBLICKEY;
|
|
|
-+ s->is_trivial_auth = false;
|
|
|
- } else {
|
|
|
- ppl_logevent("Pageant refused signing request");
|
|
|
- ppl_printf("Pageant failed to "
|
|
|
-@@ -1038,6 +1042,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- ssh_key_free(key->key);
|
|
|
- sfree(key->comment);
|
|
|
- sfree(key);
|
|
|
-+ s->is_trivial_auth = false;
|
|
|
- }
|
|
|
-
|
|
|
- #ifndef NO_GSSAPI
|
|
|
-@@ -1169,6 +1174,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- * no longer says CONTINUE_NEEDED
|
|
|
- */
|
|
|
- if (s->gss_sndtok.length != 0) {
|
|
|
-+ s->is_trivial_auth = false;
|
|
|
- s->pktout =
|
|
|
- ssh_bpp_new_pktout(
|
|
|
- s->ppl.bpp, SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
|
|
|
-@@ -1288,7 +1294,6 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- * Loop while the server continues to send INFO_REQUESTs.
|
|
|
- */
|
|
|
- while (pktin->type == SSH2_MSG_USERAUTH_INFO_REQUEST) {
|
|
|
--
|
|
|
- ptrlen name, inst;
|
|
|
- strbuf *sb;
|
|
|
-
|
|
|
-@@ -1308,6 +1313,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- */
|
|
|
- s->num_prompts = get_uint32(pktin);
|
|
|
- for (uint32_t i = 0; i < s->num_prompts; i++) {
|
|
|
-+ s->is_trivial_auth = false;
|
|
|
- ptrlen prompt = get_string(pktin);
|
|
|
- bool echo = get_bool(pktin);
|
|
|
-
|
|
|
-@@ -1472,7 +1478,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- pq_push_front(s->ppl.in_pq, pktin);
|
|
|
-
|
|
|
- } else if (s->can_passwd) {
|
|
|
--
|
|
|
-+ s->is_trivial_auth = false;
|
|
|
- /*
|
|
|
- * Plain old password authentication.
|
|
|
- */
|
|
|
-@@ -1731,6 +1737,12 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
|
|
|
- }
|
|
|
-
|
|
|
- userauth_success:
|
|
|
-+ if (s->notrivialauth && s->is_trivial_auth) {
|
|
|
-+ ssh_proto_error(s->ppl.ssh, "Authentication was trivial! "
|
|
|
-+ "Abandoning session as specified in configuration.");
|
|
|
-+ return;
|
|
|
-+ }
|
|
|
-+
|
|
|
- /*
|
|
|
- * We've just received USERAUTH_SUCCESS, and we haven't sent
|
|
|
- * any packets since. Signal the transport layer to consider
|
|
|
-diff --git a/sshppl.h b/sshppl.h
|
|
|
-index b339d67c..2c1dbf42 100644
|
|
|
---- a/sshppl.h
|
|
|
-+++ b/sshppl.h
|
|
|
-@@ -116,7 +116,7 @@ PacketProtocolLayer *ssh2_transport_new(
|
|
|
- PacketProtocolLayer *ssh2_userauth_new(
|
|
|
- PacketProtocolLayer *successor_layer,
|
|
|
- const char *hostname, const char *fullhostname,
|
|
|
-- Filename *keyfile, bool show_banner, bool tryagent,
|
|
|
-+ Filename *keyfile, bool show_banner, bool tryagent, bool notrivialauth,
|
|
|
- const char *default_username, bool change_username,
|
|
|
- bool try_ki_auth,
|
|
|
- bool try_gssapi_auth, bool try_gssapi_kex_auth,
|
|
|
-diff --git a/unix/uxplink.c b/unix/uxplink.c
|
|
|
-index 3e2a9b6b..240783f4 100644
|
|
|
---- a/unix/uxplink.c
|
|
|
-+++ b/unix/uxplink.c
|
|
|
-@@ -527,6 +527,8 @@ static void usage(void)
|
|
|
- printf(" -i key private key file for user authentication\n");
|
|
|
- printf(" -noagent disable use of Pageant\n");
|
|
|
- printf(" -agent enable use of Pageant\n");
|
|
|
-+ printf(" -no-trivial-auth\n");
|
|
|
-+ printf(" disconnect if SSH authentication succeeds trivially\n");
|
|
|
- printf(" -noshare disable use of connection sharing\n");
|
|
|
- printf(" -share enable use of connection sharing\n");
|
|
|
- printf(" -hostkey keyid\n");
|
|
|
-diff --git a/windows/winhelp.h b/windows/winhelp.h
|
|
|
-index ae5a7a7f..9011df45 100644
|
|
|
---- a/windows/winhelp.h
|
|
|
-+++ b/windows/winhelp.h
|
|
|
-@@ -111,6 +111,7 @@
|
|
|
- #define WINHELP_CTX_ssh_kex_repeat "config-ssh-kex-rekey"
|
|
|
- #define WINHELP_CTX_ssh_kex_manual_hostkeys "config-ssh-kex-manual-hostkeys"
|
|
|
- #define WINHELP_CTX_ssh_auth_bypass "config-ssh-noauth"
|
|
|
-+#define WINHELP_CTX_ssh_no_trivial_userauth "config-ssh-notrivialauth"
|
|
|
- #define WINHELP_CTX_ssh_auth_banner "config-ssh-banner"
|
|
|
- #define WINHELP_CTX_ssh_auth_privkey "config-ssh-privkey"
|
|
|
- #define WINHELP_CTX_ssh_auth_agentfwd "config-ssh-agentfwd"
|
|
|
-diff --git a/windows/winplink.c b/windows/winplink.c
|
|
|
-index 9bda0712..58d43e6d 100644
|
|
|
---- a/windows/winplink.c
|
|
|
-+++ b/windows/winplink.c
|
|
|
-@@ -149,6 +149,8 @@ static void usage(void)
|
|
|
- printf(" -i key private key file for user authentication\n");
|
|
|
- printf(" -noagent disable use of Pageant\n");
|
|
|
- printf(" -agent enable use of Pageant\n");
|
|
|
-+ printf(" -no-trivial-auth\n");
|
|
|
-+ printf(" disconnect if SSH authentication succeeds trivially\n");
|
|
|
- printf(" -noshare disable use of connection sharing\n");
|
|
|
- printf(" -share enable use of connection sharing\n");
|
|
|
- printf(" -hostkey keyid\n");
|
|
|
---
|
|
|
-2.20.1
|
|
|
-
|