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    RADIUS authentication failing (timed out) and dumping core

    Scheduled Pinned Locked Moved General pfSense Questions
    radiusopenvpnauthentication
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    • O
      opoplawski @Konstanti
      last edited by

      @Konstanti RADIUS:1812 is a redaction of the IP address. dtrace looks like a bridge to far to get working on pfSense.

      This is the only thing that ends up in the logs:

      openvpn[94373]: /openvpn.auth-user.php: Error during RADIUS authentication : Operation timed out

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      • stephenw10S
        stephenw10 Netgate Administrator
        last edited by

        Are you able to test this in Plus? Where dtrace is available.

        O 1 Reply Last reply Reply Quote 0
        • O
          opoplawski @stephenw10
          last edited by

          @stephenw10 I get:

          dtrace: invalid probe specifier fbt::rad_send_request:return , fbt::rad_continue_send_request:return , fbt::rad_init_send_request:return , fbt::is_valid_response:return {printf("=>%d",arg1)}: probe description fbt::rad_send_request:return does not match any probes

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          • stephenw10S
            stephenw10 Netgate Administrator
            last edited by

            That's in 24.11? Looks like it's working but the query you're using in invalid. I won't pretend to be any sort of expert with dtrace though!

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            • O
              opoplawski @stephenw10
              last edited by

              @stephenw10 24.03 - looks like I was stuck on previous stable for some reason. I'll try to update soon.

              Seems to me like dtrace is for kernel stuff, not just C-library tracing, but I'm completely unfamiliar with dtrace.

              K 1 Reply Last reply Reply Quote 0
              • stephenw10S
                stephenw10 Netgate Administrator
                last edited by

                Hmm, OK you're seeing the same error in radius from all three versions?

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                • K
                  Konstanti @opoplawski
                  last edited by Konstanti

                  @opoplawski
                  DTrace is a comprehensive dynamic tracing framework ported from Solaris. DTrace provides a powerful infrastructure that permits administrators, developers, and service personnel to concisely answer arbitrary questions about the behavior of the operating system and user programs.

                  here is an example of working in user space, maybe you need to know the name of the process that calls the necessary functions

                  a76ea0c9-c671-4aed-ac93-03950fb6dec6-image.png

                  or

                  8e8ff1fb-b1c1-48e8-8e34-aeaee286d695-image.png

                  O 1 Reply Last reply Reply Quote 0
                  • O
                    opoplawski @Konstanti
                    last edited by

                    @Konstanti As I understand it, I would need probes for the php radius library in order to trace it. When I look at the output of dtrace -l to show the available probes I don't see anything relevant to what I want to trace. There are kernel functions, malloc stuff, syscalls (but I already have that with truss), etc.

                    It appears that php can be built with dtrace support, but it appears that it hasn't in pfSense Plus. But again what I really want to trace is php-pecl-radius

                    K 1 Reply Last reply Reply Quote 0
                    • K
                      Konstanti @opoplawski
                      last edited by Konstanti

                      @opoplawski

                      Hi
                      You were right, I was wrong, dtrace does not work with all functions. Therefore, as a result, we see a probe error

                      P.S.
                      I think I've found a solution for the userland programs

                      1. we find the pid of the php-fpm process
                        ps -awx | grep php
                        342 - Ss 8:55.06 php-fpm: master process (/usr/local/lib/php-fpm.conf) (php-fpm)
                        23960 - I 3:31.30 php-fpm: pool nginx (php-fpm)
                        27761 - I 2:07.14 php-fpm: pool nginx (php-fpm)
                        31652 - I 3:16.94 php-fpm: pool nginx (php-fpm)
                        37038 - I 3:12.25 php-fpm: pool nginx (php-fpm)
                        46849 - I 0:55.34 php-fpm: pool nginx (php-fpm)
                        55575 - I 3:18.29 php-fpm: pool nginx (php-fpm)
                        94877 - I 2:03.82 php-fpm: pool nginx (php-fpm)

                      2 using dtrace
                      dtrace -qn 'pid342:radius.so::entry { @[probefunc] = count();}'

                      dtrace -l | grep pid

                      70870 pid342 radius.so zif_radius_put_vendor_addr entry
                      70871 pid342 radius.so rad_close entry
                      70872 pid342 radius.so rad_create_request entry
                      70873 pid342 radius.so rad_put_vendor_int entry
                      70874 pid342 radius.so rad_demangle entry
                      70875 pid342 radius.so zif_radius_get_vendor_attr entry
                      70876 pid342 radius.so rad_strerror entry
                      70877 pid342 radius.so zif_radius_send_request entry
                      70878 pid342 radius.so zif_radius_get_tagged_attr_tag entry
                      70879 pid342 radius.so zif_radius_demangle entry
                      70880 pid342 radius.so zif_radius_request_authenticator entry
                      70881 pid342 radius.so zif_radius_put_int entry
                      70882 pid342 radius.so rad_salt_value entry
                      70883 pid342 radius.so zif_radius_salt_encrypt_attr entry
                      70884 pid342 radius.so zif_radius_strerror entry
                      70885 pid342 radius.so zif_radius_config entry
                      70886 pid342 radius.so zif_radius_cvt_int entry
                      70887 pid342 radius.so rad_acct_open entry
                      70888 pid342 radius.so zif_radius_cvt_string entry
                      70889 pid342 radius.so zif_radius_server_secret entry
                      70890 pid342 radius.so zif_radius_get_tagged_attr_data entry
                      70891 pid342 radius.so rad_put_vendor_attr entry
                      70892 pid342 radius.so rad_send_request entry
                      70893 pid342 radius.so rad_put_vendor_addr entry
                      70894 pid342 radius.so zif_radius_add_server entry
                      70895 pid342 radius.so zif_radius_close entry
                      70896 pid342 radius.so rad_get_vendor_attr entry
                      70897 pid342 radius.so rad_init_send_request entry
                      70898 pid342 radius.so zif_radius_auth_open entry
                      70899 pid342 radius.so _radius_close entry
                      70900 pid342 radius.so rad_continue_send_request entry
                      70901 pid342 radius.so get_module entry
                      70902 pid342 radius.so rad_put_int entry
                      70903 pid342 radius.so rad_put_attr entry
                      70904 pid342 radius.so rad_auth_open entry
                      70905 pid342 radius.so rad_get_attr entry
                      70906 pid342 radius.so rad_cvt_int entry
                      70907 pid342 radius.so zif_radius_acct_open entry
                      70908 pid342 radius.so rad_cvt_addr entry
                      70909 pid342 radius.so rad_put_addr entry
                      70910 pid342 radius.so rad_server_secret entry
                      70911 pid342 radius.so zif_radius_put_attr entry
                      70912 pid342 radius.so zif_radius_get_attr entry
                      70913 pid342 radius.so zif_radius_cvt_addr entry
                      70914 pid342 radius.so zif_radius_put_addr entry
                      70915 pid342 radius.so zm_startup_radius entry
                      70916 pid342 radius.so rad_config entry
                      70917 pid342 radius.so zm_info_radius entry
                      70918 pid342 radius.so zif_radius_demangle_mppe_key entry
                      70919 pid342 radius.so zif_radius_create_request entry
                      70920 pid342 radius.so rad_open entry
                      70921 pid342 radius.so zif_radius_put_vendor_int entry
                      70922 pid342 radius.so zif_radius_put_string entry
                      70923 pid342 radius.so rad_cvt_string entry
                      70924 pid342 radius.so rad_demangle_mppe_key entry
                      70925 pid342 radius.so rad_put_string entry
                      70926 pid342 radius.so rad_request_authenticator entry
                      70927 pid342 radius.so zif_radius_put_vendor_string entry
                      70928 pid342 radius.so zif_radius_put_vendor_attr entry
                      70929 pid342 radius.so zm_shutdown_radius entry
                      70930 pid342 radius.so rad_put_vendor_string entry
                      70931 pid342 radius.so rad_add_server entry

                      for example ,

                      dtrace -n 'pid342:radius.so:rad_send_request:return {printf("=>%d",arg1)}'
                      dtrace: description 'pid342:radius.so:rad_send_request:return ' matched 1 probe

                      O 1 Reply Last reply Reply Quote 1
                      • O
                        opoplawski @Konstanti
                        last edited by

                        @Konstanti well, that was an interesting if ultimately unfruitful direction, thanks. I created the following script to create a dtruss script:

                        #!/usr/local/bin/perl
                        
                        open(PS,'ps -awx |');
                        while (<PS>) {
                          next unless /php-fpm: pool/;
                          ($pid) = split;
                          push(@pids, $pid);
                        }
                        close(PS);
                        
                        print "syscall::recvfrom:return\n";
                        print "/pid == " . join(" || pid == ", @pids) . "/\n";
                        print "{\n";
                        print 'printf("\n%d:\trecvfrom() = %d\n", pid, arg1);' . "\n";
                        print "}\n";
                        
                        my $last_pid = pop(@pids);
                        foreach $pid (@pids) {
                           print "pid" . $pid . ":radius.so::entry,\n";
                        }
                        print "pid" . $last_pid . ":radius.so::entry\n";
                        print "{\n";
                        print 'printf("%d:\t%s(%d, 0x%x, %4d)\t", pid, probefunc, arg0, arg1, arg2);' . "\n";
                        print "}\n";
                        
                        foreach $pid (@pids) {
                           print "pid" . $pid . ":radius.so:rad_strerror:return,\n";
                        }
                        print "pid" . $last_pid . ":radius.so:rad_streeor:return\n";
                        print "{\n";
                        print 'printf("(%d)\t = %s\n", pid, copyinstr(arg1));' . "\n";
                        print "}\n";
                        
                        foreach $pid (@pids) {
                           print "pid" . $pid . ":radius.so::return,\n";
                        }
                        print "pid" . $last_pid . ":radius.so::return\n";
                        print "{\n";
                        print 'printf("(%d)\t = %d\n", pid, arg1);' . "\n";
                        print "}\n";
                        

                        It produces something like:

                        syscall::recvfrom:return
                        /pid == 14656 || pid == 30511 || pid == 31820 || pid == 53410 || pid == 74857 || pid == 99423 || pid == 99617/
                        {
                        printf("\n%d:\trecvfrom() = %d\n", pid, arg1);
                        }
                        pid14656:radius.so::entry,
                        pid30511:radius.so::entry,
                        pid31820:radius.so::entry,
                        pid53410:radius.so::entry,
                        pid74857:radius.so::entry,
                        pid99423:radius.so::entry,
                        pid99617:radius.so::entry
                        {
                        printf("%d:\t%s(%d, 0x%x, %4d)\t", pid, probefunc, arg0, arg1, arg2);
                        }
                        pid14656:radius.so:rad_strerror:return,
                        pid30511:radius.so:rad_strerror:return,
                        pid31820:radius.so:rad_strerror:return,
                        pid53410:radius.so:rad_strerror:return,
                        pid74857:radius.so:rad_strerror:return,
                        pid99423:radius.so:rad_strerror:return,
                        pid99617:radius.so:rad_streeror:return
                        {
                        printf("(%d)\t = %s\n", pid, copyinstr(arg1));
                        }
                        pid14656:radius.so::return,
                        pid30511:radius.so::return,
                        pid31820:radius.so::return,
                        pid53410:radius.so::return,
                        pid74857:radius.so::return,
                        pid99423:radius.so::return,
                        pid99617:radius.so::return
                        {
                        printf("(%d)\t = %d\n", pid, arg1);
                        }
                        

                        And I got (cleaned up):

                        53410:  rad_send_request(45709006907392, 0x299275926a00,   80)
                        53410:  recvfrom() = 244
                        53410:  recvfrom() = -1
                        53410:  recvfrom() = 244
                        53410:  recvfrom() = -1
                        53410:  recvfrom() = 244
                        53410:  recvfrom() = -1
                        (53410)  = 4294967295
                        53410:  rad_strerror(45709006907392, 0x299275926a00,   80)   (53410)  = Operation timed out
                        

                        Which is pretty much what I knew before. Still no idea why rad_send_request() does not accept the response that it gets.

                        On the up side, I do know a lot more know about dtrace.

                        K 1 Reply Last reply Reply Quote 1
                        • K
                          Konstanti @opoplawski
                          last edited by Konstanti

                          @opoplawski
                          Hi
                          , what happens when the recvfrom function is executed has been known for a long time

                          the question is what happens when the client receives a response (244 bytes)
                          during the execution of this part of the program, the

                          rad_send_request
                          rad_continue_send_request
                          rad_init_send_request
                          is_valid_response

                          functions are used

                          the most interesting function, in my opinion, is
                          is_valid_response

                          but, apparently, it is impossible to get the result of its execution, this is an internal function that dtrace does not "see".

                          you can try to see what result the rest of the functions from this list return using dtrace

                          print 'printf("(%d)\t %s= %d\n", pid,probefunc,arg1);' . "\n";

                          I also recommend using tcpdump to analyze traffic on port 1812

                          suspect that the problem is precisely the result that the is_valid_response function returns
                          in case of an error, it returns 0 and forces the program to receive data from the socket (the second attempt to call the recvfrom function), as expected, the socket is empty and the function returns an error 35 EAGAIN

                          53410: recvfrom() = 244
                          recvfrom(9,"^B\M-)\0\M-t\rv\M-]O~\M-$}\M-4~"...,4096,MSG_WAITALL,{ AF_INET
                          RADIUS:1812 },0x820d022fc) = 244 (0xf4)

                          53410: recvfrom() = -1
                          recvfrom(9,0x37bbc7deab51,4096,MSG_WAITALL,0x820d02300,0x820d022fc) ERR#35
                          'Resource temporarily unavailable'

                          unfortunately, I do not find in the library code (radius.so) any implementation of zeroing the data reception buffer before calling the recvfrom function. Therefore, it is not known what is in the buffer after receiving the data,
                          is_valid_response

                          1. Check the source address
                            if ok, then
                          2. Check the message length
                            if ok , then
                          3. Check the response authenticator
                            if ok, the packet has been verified (return 1)
                            otherwise (return 0)

                          it is necessary to use tcpdump to analyze the radius server response

                          GertjanG 1 Reply Last reply Reply Quote 0
                          • GertjanG
                            Gertjan @Konstanti
                            last edited by

                            @Konstanti said in RADIUS authentication failing (timed out) and dumping core:

                            it is necessary to use tcpdump to analyze the radius server response

                            Don't forget
                            radtest
                            radsniff
                            radsniff

                            and
                            running radius manually

                            radiusd -X
                            

                            (kill in first in the GUI then start it on the console or SSH )

                            No "help me" PM's please. Use the forum, the community will thank you.
                            Edit : and where are the logs ??

                            O 1 Reply Last reply Reply Quote 1
                            • O
                              opoplawski @Gertjan
                              last edited by

                              @Gertjan So I used both tcpdump and radsniff to look at packet traces, but I can't see any issues. In both cases (working and non-working) the radius server sends back an Access-Accept message with the same set of fields.

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