search for: pam_limits

Hi, I have an account server with many users. It uses pam_limits module to limit memory usage etc. The problem is that sometimes SSH rejects connection after the password is entered. In syslog it prints something like "fork: Resource temporary unavailable". After killing some root processes it works perfectly. Perhaps the daemon first sets proc...

I'm using Dovecot 1.1.7 on CentOS 5.2. I've changed my passdb from passwd to pam, it works fine, but I've found this messages on /var/log/secure: dovecot-auth: PAM adding faulty module: /lib64/security/pam_limits.so dovecot-auth: PAM unable to dlopen(/lib64/security/pam_limits.so) dovecot-auth: PAM [error: /lib64/security/pam_limits.so: failed to map segment from shared object: Cannot allocate memory] Latter I realized that my auth_process_size was 64. Changed it to 128 and problem solved. But I suspect...

...Wed, 5 Sep 2001, Nalin Dahyabhai wrote: > > > Date: Wed, 5 Sep 2001 17:31:10 -0400 > > > From: Nalin Dahyabhai <nalin at redhat.com> > > > To: Ognyan Kulev <ogi at fmi.uni-sofia.bg> > > > Cc: openssh-unix-dev at mindrot.org > > > Subject: Re: pam_limits and OpenSSH > > > > > > On Wed, Sep 05, 2001 at 04:53:05PM +0300, Ognyan Kulev wrote: > > > > Perhaps the daemon first sets process limits and then switches to the > > > > user and/or fork(). But fork() cannot succeed because there is a > > > >...

With the sshd in recent releases of OpenSSH, some Red Hat Linux systems complain about ulimit trying to raise a limit when logging in via ssh. The problem is that packages/redhat/sshd.pam doesn't do limit checking for an sshd session. The attached patch adds the pam_limits module to the sshd session, which checks for limits set in /etc/security/limits.conf. This works on Red Hat Linux 5.2 (pam-0.64-4) in the following scenarios: - pam_limits included in /etc/pam.d/sshd, but /etc/security/limits.conf does not exist. Sshd allows login with default limits (...

...e to find out why /var/log/messages is getting flooded with Oct 26 11:01:06 <servername> kernel: type=1105 audit(1477494066.569:642430): pid=108551 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:unconfined_service_t:s0 msg='op=PAM:session_open grantors=pam_keyinit,pam_keyinit,pam_limits,pam_systemd,pam_unix,pam_krb5,pam_xauth acct="<user>" exe="/usr/bin/su" hostname=? addr=? terminal=? res=success' Oct 26 11:01:06 <servername> kernel: type=1106 audit(1477494066.620:642431): pid=108548 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:u...

Hello, I have dovecot installed and it works for about 3 hours then I get this error (in /var/log/maillog): Jan 8 08:42:53 stu dovecot: auth(default): pam(grossmsm,69.131.100.47): pipe() failed: Too many open files I set pam_limits.so to allow the user 'dovecot' to have 8192 open files, and I also changed: login_process_size = 512 However, it still wont work for more than a few hours. When I run: lsof -p `ps -o pid= -C dovecot-auth` I get: [...] dovecot-a 1385 root 248u sock 0,5 374241289 can'...

...i see this in the logs hostname su(pam_unix)[20237]: session closed for user oracle and also hostname login[19841]: Module is unknown so the pwd is not accepted and the connection on the console terminated straight away. I have added this to my pam.d login file session required /lib/security/pam_limits.so So i presume this is what is causing the issue but does anyone know which module may be missing? # rpm -qa | grep pam pam_ccreds-3-3.rhel4.2 pam-0.77-66.21 pam_krb5-2.1.8-1 pam_smb-1.1.7-5 pam_passwdqc-0.7.5-2 thanks

...ull paths to the modules, is this necessary? - I want a "no-frills" control file which will work with the widest range of systems and still be secure. Would something like the following work everywhere? I assume pam_unix is pretty standards, but how about pam_cracklib, pam_nologin and pam_limits? I don't really want to ship without pam_cracklib in for password changes (since that is what most sites use as default). Can password changing be disabled using pam_deny? #%PAM-1.0 auth required pam_unix.so shadow nodelay auth required pam_nologin.so account required...

https://bugzilla.mindrot.org/show_bug.cgi?id=2263 Bug ID: 2263 Summary: sshd privsep monitor process doesn't handle SIGXFSZ signal Product: Portable OpenSSH Version: 6.6p1 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P5 Component: sshd

Hi, For one of my application, for accepting the ssh connection on different namespaces, I am instantiating "sshd service" on different namespaces. I am able to create ssh connection on each namespcae but I want to put a limitation on max concurrent ssh connection to 5 for each namespace. Is there a way to achieve it using openssh. Thanks & Regards Amit

...> Same ip, connection, session happens after a few seconds, all on local > test network. Sorry I mistakenly overlooked at the ip:s. But anyway that is multiple connections and seems that PAM has some concurrency limit and refuses the third connection Thunderbird opens. so you probably have pam_limits with maxlogins=2 enabled. Sami

...r; I've set username nofiles to unlimited in /etc/security/logins.conf, but now I get "could not open session" if I try to su to the user. singhh - nofile unlimited I think this is related to PAM, so I've modifed /etc/pam.d/su and /etc/pam.d/login to use pam_limits.so: # cat /etc/pam.d/su #%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" group. #auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wh...

On Thu, 30 Mar 2023, Fran?ois Ouellet wrote: > Hi, > > We need to limit concurrent sftp logins to one per user (because of bad > client behaviour). Is there any way to achieve this I have overlooked? > > It seems it could be possible with pam_limits, if sftp sessions were > recorded in utmp (a guess from what I found googling around). If I > configure /etc/security/limits.conf with > > testuser hard maxlogins 1 > > and connect with ssh, and try a second connection with sftp, the sftp > fails because there is already o...

Hi, We need to limit concurrent sftp logins to one per user (because of bad client behaviour). Is there any way to achieve this I have overlooked? It seems it could be possible with pam_limits, if sftp sessions were recorded in utmp (a guess from what I found googling around). If I configure /etc/security/limits.conf with testuser hard maxlogins 1 and connect with ssh, and try a second connection with sftp, the sftp fails because there is already one session open. But if I connect...

http://bugzilla.mindrot.org/show_bug.cgi?id=732 ------- Additional Comments From dtucker at zip.com.au 2003-12-22 21:40 ------- Which PAM modules do you have in your sshd PAM stack? ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee.

...or /etc/security/limits.conf and pam. Here's what I have added in limits.conf # -- fix fork bomb issue -- @"Domain Users" soft nproc 20 @"Domain Users" hard nproc 20 And here is what I have in pam.d/common-session session required pam_limits.so -- I'm pretty sure the pam stuff is correct because I was able to set nproc limits on a non-domain user. But I'm wondering if we can set limits to AD provided groups. Any advice? -- David Bear mobile: (602) 903-6476

...klib.so password optional pam_gnome_keyring.so use_authtok password sufficient pam_unix.so use_authtok nullok shadow try_first_pass password required pam_sss.so use_authtok session optional pam_keyinit.so revoke session required pam_limits.so -session optional pam_systemd.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so session sufficient pam_sss.so session required pam_unix.so try_first_pass session optional pam_umask....

...try=3 authtok_type= > password sufficient pam_unix.so md5 shadow nullok try_first_pass > use_authtok > password sufficient pam_sss.so use_authtok > password required pam_deny.so > > session optional pam_keyinit.so revoke > session required pam_limits.so > -session optional pam_systemd.so > session [success=1 default=ignore] pam_succeed_if.so service in > crond quiet use_uid > session required pam_unix.so > session optional pam_sss.so > > My /etc/pam.d/password-auth: > #%PAM-1.0 > # This...

...ufficient pam_winbind.so auth required pam_nologin.so account sufficient pam_winbind.so account required pam_stack.so service=system-auth password required pam_stack.so service=system-auth session required pam_stack.so service=system-auth session required pam_limits.so session optional pam_console.so I'm using Red Hat EL AS 3 which I believe tries to centralise most of this in system-auth, and this is what I have there: auth required /lib/security/$ISA/pam_env.so auth sufficient /lib/security/$ISA/pam_winbind.so auth s...

...t required /lib/security/pam_stack.so service=system-auth + account sufficient /lib/security/pam_winbind.so password required /lib/security/pam_stack.so service=system-auth session required /lib/security/pam_stack.so service=system-auth session required /lib/security/pam_limits.so session optional /lib/security/pam_console.so ideas, solutions, and pointers to a FAQ or some good pam documentation are all appreciated, as I'll be the first to admit that I don't know my ass from my elbow with regards to pam. -- Aaron Bennett UNIX Administrator Franklin W....