[syslog-ng] Using usertty
Alexandre Santos
alexandre.rosas.santos at gmail.com
Mon Nov 2 16:21:25 UTC 2020
Hi Gabor,
Do you have some news regarding this issue?
Another update from my side, is that if I login as root in serial console,
I am able to get the notifications:
*[pid 4155] openat(AT_FDCWD, "/dev/ttyS0",
O_WRONLY|O_NOCTTY|O_APPEND|O_NONBLOCK) = 18</dev/ttyS0<char 4:64>>[pid
4155] write(18</dev/ttyS0<char 4:64>>, "2020 Nov 2 16:14:35 debian10st
Entry local0.crit 2020-11-02T16:14:35,489343700+00:00\n", 86) = 86[pid
4155] close(18</dev/ttyS0<char 4:64>>) = 0*
*root at debian10st:/home/thanos# w thanos 16:19:50 up 6 days, 24 min, 4
users, load average: 0.00, 0.00, 0.00USER TTY FROM
LOGIN@ IDLE JCPU PCPU WHATthanos pts/0 10.0.2.2 26Oct20
6:14 0.07s 1.85s sshd: thanos [priv]thanos pts/1 10.0.2.2
26Oct20 6:37 0.12s 1.87s sshd: thanos [priv]thanos pts/2 10.0.2.2
26Oct20 0.00s 0.05s 1.93s sshd: thanos
[priv]root at debian10st:/home/thanos# w root 16:20:15 up 6 days, 24 min, 4
users, load average: 0.00, 0.00, 0.00USER TTY FROM
LOGIN@ IDLE JCPU PCPU WHATroot ttyS0 - 16:14
13.00s 0.01s 0.01s -bash*
Any help appreciated.
Thanks,
Alex
On Wed, Oct 28, 2020 at 5:24 PM Alexandre Santos <
alexandre.rosas.santos at gmail.com> wrote:
> Hi Gabor,
>
> Thanks for your help, testing with echo "test" is working fine (check
> bellow), but with usertty, I still have the same problem.
>
> Furthermore, I tried strace and saw the following:
>
>
> *[pid 2177] rt_sigaction(SIGALRM, {sa_handler=0x7fa889b23e10, sa_mask=[],
> sa_flags=SA_RESTORER, sa_restorer=0x7fa889541840}, NULL, 8) = 0[pid 2177]
> write(2</dev/pts/1<char 136:1>>, "[2020-10-28T17:15:36.178232] Posting
> message to user terminal; user='thanos', line='/dev/ttyS0'\n", 96) = 96[pid
> 2177] openat(AT_FDCWD, "/dev/ttyS0",
> O_WRONLY|O_NOCTTY|O_APPEND|O_NONBLOCK) = -1 EACCES (Permission denied)*
>
> Do you know why? I am launching syslog-ng as root. (full strace in
> attachment)
>
> Regards,
> Alex
>
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> *thanos at debian10st:~$ echo test >
> /dev/ttyS0testroot at debian10st:/home/thanos# who am ithanos pts/1
> 2020-10-26 20:21 (10.0.2.2)root at debian10st:/home/thanos# echo "test1" >
> /dev/pts/1test1root at debian10st:/home/thanos#thanos at debian10st:~$ who am
> ithanos pts/0 2020-10-26 20:21 (10.0.2.2)thanos at debian10st:~$ echo
> "test0" > /dev/pts/0test0thanos at debian10st:~$root at debian10st:/home/thanos#
> who am ithanos pts/2 2020-10-26 20:26
> (10.0.2.2)root at debian10st:/home/thanos# echo "test2" > /dev/pts/2test2*
>
> On Wed, Oct 28, 2020 at 3:33 PM Gabor Nagy (gnagy) <
> Gabor.Nagy at oneidentity.com> wrote:
>
>> Thanks for the info!
>>
>> It looks good, messages should be seen on ssh and on serial console too.
>> Can you try out if you can write in the /dev/ttyS0 file (and/or the ssh
>> login console, in your example /dev/pts/1) with a simple "echo test"
>> command and see if it appears on the console, please?
>> ------------------------------
>> *From:* syslog-ng <syslog-ng-bounces at lists.balabit.hu> on behalf of
>> Alexandre Santos <alexandre.rosas.santos at gmail.com>
>> *Sent:* Tuesday, October 27, 2020 10:20
>> *To:* Syslog-ng users' and developers' mailing list <
>> syslog-ng at lists.balabit.hu>
>> *Subject:* Re: [syslog-ng] Using usertty
>>
>> CAUTION: This email originated from outside of the organization. Do not
>> follow guidance, click links, or open attachments unless you recognize the
>> sender and know the content is safe.
>>
>> Hi Gabor,
>>
>> I am running a Debian buster in a VBox guest.
>>
>> Can you check which terminals are the user 'thanos' logged in?
>>
>>
>>
>>
>>
>>
>> *root at debian10st:/home/thanos# w thanos 09:15:47 up 22:00, 4 users,
>> load average: 0.00, 0.02, 0.00 USER TTY FROM LOGIN@
>> IDLE JCPU PCPU WHAT thanos ttyS0 - Mon20 8:27
>> 0.05s 0.04s -bash thanos pts/0 10.0.2.2 Mon20 12:54m 0.03s
>> 0.03s -bash thanos pts/1 10.0.2.2 Mon20 12:50m 0.12s
>> 0.18s sshd: thanos [priv] thanos pts/2 10.0.2.2 Mon20
>> 1.00s 0.04s 0.20s sshd: thanos [priv]*
>>
>> Here are the serial configurations:
>>
>>
>>
>>
>>
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>>
>>
>>
>>
>> *root at debian10st:/home/thanos# stty -F /dev/ttyS0 -a speed 9600 baud;
>> rows 24; columns 80; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U;
>> eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop
>> = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = <undef>; discard =
>> <undef>; min = 1; time = 0; -parenb -parodd -cmspar cs8 hupcl -cstopb cread
>> clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr
>> -igncr -icrnl ixon ixoff -iuclc -ixany -imaxbel iutf8 opost -olcuc -ocrnl
>> onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig -icanon
>> -iexten -echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl
>> echoke -flusho -extproc root at debian10st:/home/thanos# stty -F /dev/pts/0 -a
>> speed 38400 baud; rows 50; columns 184; line = 0; intr = ^C; quit = ^\;
>> erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch =
>> <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext =
>> <undef>; discard = <undef>; min = 1; time = 0; -parenb -parodd -cmspar cs8
>> -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk
>> -inpck -istrip -inlcr -igncr -icrnl ixon -ixoff -iuclc ixany -imaxbel iutf8
>> opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0
>> ff0 isig -icanon iexten -echo echoe echok -echonl -noflsh -xcase -tostop
>> -echoprt echoctl echoke -flusho -extproc *
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *root at debian10st:/home/thanos# stty -F /dev/pts/1 -a speed 38400 baud;
>> rows 50; columns 184; line = 0; intr = ^C; quit = ^\; erase = ^H; kill =
>> ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q;
>> stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O;
>> min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal
>> -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl
>> ixon -ixoff -iuclc ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr
>> -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo
>> echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho
>> -extproc *
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *root at debian10st:/home/thanos# stty -F /dev/pts/2 -a speed 38400 baud;
>> rows 50; columns 184; line = 0; intr = ^C; quit = ^\; erase = ^H; kill =
>> ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q;
>> stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O;
>> min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal
>> -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl
>> ixon -ixoff -iuclc ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr
>> -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo
>> echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho
>> -extproc *
>>
>> Thanks,
>> Alex
>>
>> On Mon, Oct 26, 2020 at 10:59 AM Gabor Nagy (gnagy) <
>> Gabor.Nagy at oneidentity.com> wrote:
>>
>> Hi Alex!
>>
>> I've checked your attachments and I see that the messages are sent to
>> pseudo-terminals and the serial port too:
>> [2020-10-23T16:40:20.647481] Posting message to user terminal;
>> user='thanos', line='/dev/ttyS0'
>> [2020-10-23T16:40:20.647518] Posting message to user terminal;
>> user='thanos', line='/dev/pts/0'
>> [2020-10-23T16:40:20.647530] Posting message to user terminal;
>> user='thanos', line='/dev/pts/1'
>> [2020-10-23T16:40:20.647541] Posting message to user terminal;
>> user='thanos', line='/dev/pts/2'
>>
>> Can you check which terminals are the user 'thanos' logged in?
>> E.g. use the following command on the command line:
>> $w thanos
>>
>> If you don't see a tty with ssh login, that can explain it.
>>
>> About the serial port, maybe it's misconfigured.
>> Syslog-ng uses simple open/write calls on the device files , e.g.
>> /dev/ttyS0. Can you try out if you can write in the /dev/ttyS0 file with a
>> simple "echo test" command, please?
>> Can you tell us a bit more about your host and how did you set up the
>> serial port?
>>
>> Regards,
>> Gabor
>> ------------------------------
>> *From:* syslog-ng <syslog-ng-bounces at lists.balabit.hu> on behalf of
>> Alexandre Santos <alexandre.rosas.santos at gmail.com>
>> *Sent:* Friday, October 23, 2020 17:46
>> *To:* Syslog-ng users' and developers' mailing list <
>> syslog-ng at lists.balabit.hu>
>> *Subject:* [syslog-ng] Using usertty
>>
>> CAUTION: This email originated from outside of the organization. Do not
>> follow guidance, click links, or open attachments unless you recognize the
>> sender and know the content is safe.
>>
>> Hi,
>> I am trying to use usertty(*) to send log all messages with severity
>> equal or higher than critical to every user logged.
>>
>> But I am not getting any messages in serial port or ssh.
>>
>> I am sending the configurations and the debug log in attachment.
>>
>> Can you help me to understand what is happening?
>>
>> Thanks in advance,
>> Alex
>>
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>>
>> ______________________________________________________________________________
>> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
>> Documentation:
>> http://www.balabit.com/support/documentation/?product=syslog-ng
>> FAQ: http://www.balabit.com/wiki/syslog-ng-faq
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