similar to: [Bug 524] Keyboard-interactive PAM back end hides information

http://bugzilla.mindrot.org/show_bug.cgi?id=524 Summary: Keyboard-interactive PAM back end hides information Product: Portable OpenSSH Version: -current Platform: All OS/Version: All Status: NEW Severity: minor Priority: P2 Component: sshd AssignedTo: openssh-unix-dev at mindrot.org

The following patch (relative to -current) makes PAM a proper kbd-interactive citizen. There are a few limitations (grep for todo), but the code seems to work OK for protocols 1 & 2 with and without privsep. Please have a play! auth2-pam.c is based on code from FreeBSD. Index: auth2-chall.c =================================================================== RCS file:

I have a simple goal: to use PAM to do my TIS authsrv authentications. I have Mark Roth's pam_authsrv module -- it works fine. + I can configure openssh for PAM, and it works fine (negotiating ssh2 keyboard interactive auth method). + I can configure ssh.com-3.0.1 for PAM, and it also works fine (negotiating ssh2 pam-1 at ssh.com auth method). Unfortunately, the openssh client

Hi All. Attached is another patch that attempts to do pam_chauthtok() via SSH2 keyboard-interactive authentication. It now passes the results from the authentication thread back to the monitor (based on a suggestion from djm). Because of this, it doesn't call do_pam_account twice and consequently now works on AIX 5.2, which the previous version didn't. I haven't tested it on any

http://bugzilla.mindrot.org/show_bug.cgi?id=808 dtucker at zip.com.au changed: What |Removed |Added ---------------------------------------------------------------------------- OtherBugsDependingO| |821 nThis| | ------- Additional Comments From dtucker at zip.com.au 2004-04-13 19:07 -------

Is there a way for a PAM module to force a client (and the server) to use kbd-interactive? As far as I can tell, when in the INITIAL_LOGIN phase, all communication with the client returns a PAM_CONV_ERR. I am trying to write a PAM module that will prompt a user for a second username and a second password in order for the module to succeed so that proper authentication relies on the ability

bugzilla-daemon at mindrot.org wrote: >Summary: segfault if not using pam/keyboard-interactive mech and > password's expired I'm sorry to report that there is a bug in the PAM code in OpenSSH 3.8p1, and sorrier to say that I put it there. This is a NULL pointer dereference and is *not* considered to be a security vulnerability. When sshd is configured --with-pam, run with

https://bugzilla.mindrot.org/show_bug.cgi?id=2549 Bug ID: 2549 Summary: [PATCH] Allow PAM conversation for pam_setcred for keyboard-interactive authentication Product: Portable OpenSSH Version: 7.1p2 Hardware: Sparc OS: Solaris Status: NEW Severity: enhancement Priority: P5

http://bugzilla.mindrot.org/show_bug.cgi?id=808 Summary: segfault if not using pam/keyboard-interactive mech and password's expired Product: Portable OpenSSH Version: 3.8p1 Platform: Sparc OS/Version: Solaris Status: NEW Severity: normal Priority: P2 Component: PAM support

You need to disable ?ChallengeResponse? (aka keyboard-interactive) authentication, not password authentication, to protect against this attack. On Jul 22, 2015, at 1:56 PM, Bostjan Skufca <bostjan at a2o.si> wrote: > > And to answer your question about what to do, you have three options: > - disable access to ssh with a firewall > - disable password authentication > -

http://www.mindrot.org/~djm/openssh/openssh-newpam-20030123.tar.gz Is a snapshot of the new PAM-via-KbdInt authentication support from FreeBSD's OpenSSH tree. Please test this now. I can only surmise by the silence that has greeted my previous requests for testing that the code works perfectly. -d

Hi, I want to write pam module for challenge response based authentication with keyboard interactive authentication method on both sshd (server) and ssh (client) side. How should I write the pam modules. What is the general protocol between pam functions and the calling functions. What information does the sshd gives to the pam module how can the pam module send the information back to

http://bugzilla.mindrot.org/show_bug.cgi?id=1188 Summary: keyboard-interactive should not allow retry after pam_acct_mgmt fails Product: Portable OpenSSH Version: -current Platform: Other OS/Version: All Status: NEW Severity: normal Priority: P2 Component: PAM support

Hi All. Today a patch was commited to OpenSSH that performs PAM password changes via SSH2 keyboard-interactive authentication. I should work fine with privsep, which some of the other solutions have problems with. While the patch itself is relatively small, it's bigger than it should have been due to differences in PAM implementations. I encourage anyone with a interest in this to try

https://bugzilla.mindrot.org/show_bug.cgi?id=2408 Bug ID: 2408 Summary: Expose authentication information to PAM Product: Portable OpenSSH Version: -current Hardware: Other OS: Linux Status: NEW Severity: enhancement Priority: P5 Component: PAM support Assignee:

http://bugzilla.mindrot.org/show_bug.cgi?id=564 ------- Additional Comments From djm at mindrot.org 2003-07-30 11:48 ------- Maybe UsePAM should be a tri-state: "kbd-int", "no" or "always". This is ugly - suggestions wanted. ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee.

Hello, I am developing a PAM module that is called from OpenSSH server when a ssh-client wants to login in the machine. I want my module PAM to send a message to the ssh-client as soon as the PAM module is called by using the pam_info function, but I have checked that the message is not instantly shown in the client unless I send a prompt. I would like to find a way to send the message instantly

The following is a patch (based on FreeBSD code) which gets kbd-int working with privsep. It moves the kbd-int PAM conversation to a child process and communicates with it over a socket. The patch has a limitation: it does not handle multiple prompts - I have no idea how common these are in real-life. Furthermore it is not well tested at all (despite my many requests on openssh-unix-dev@). -d

I read an article today about keyboard interactive auth allowing bruteforcing. I'm afraid I have minimal understanding of what keyboard-interactive really does. What does it do, and should I have my clients set it to off in sshd_config? --- Scott Neugroschl | XYPRO Technology Corporation 4100 Guardian Street | Suite 100 |Simi Valley, CA 93063 | Phone 805 583-2874|Fax 805 583-0124 |

Below is a new PAM kbd-int diff based on FreeBSD's code. This code makes PAM kbd-int work with privilege separation. Contrary to what I have previously stated - it *does* handle multiple prompts. What it does not handle is multiple passes through the PAM conversation function, which would be required for expired password changing. I would really appreciate some additional eyes over the