grsecurity forums

by **voron** » Mon May 29, 2006 9:29 am

I've started full learning with

Code: Select all: voron grsec # gradm -F -L /var/gradm.log voron grsec # gradm -S The RBAC system is currently enabled. voron grsec #

in dmesg

Code: Select all: [17179869.112000] grsec: (default:D:/sbin/gradm) grsecurity 2.1.9 RBAC system loaded by /sbin/gradm[gradm:19644] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:20047] uid/euid:0/0 gid/egid:0/0

But I can't stop it

Code: Select all: voron grsec # gradm -D Password: Invalid password. voron grsec #

gradm -a admin gives me the same result. My box is

Code: Select all: uname -r 2.6.16.9-grsec

with grsecurity-2.1.9-2.6.16.12-200605012018.patch and gradm-2.1.9.200602141850 . Strace of gradm -D

Code: Select all: voron grsec # strace gradm -D execve("/sbin/gradm", ["gradm", "-D"], [/* 45 vars */]) = 0 uname({sys="Linux", node="voron.noname.com.ua", ...}) = 0 brk(0) = 0x8076da8 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/usr/X11R6/lib/tls/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/usr/X11R6/lib/tls/i686", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/usr/X11R6/lib/tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/usr/X11R6/lib/tls", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/usr/X11R6/lib/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/usr/X11R6/lib/i686", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/usr/X11R6/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/usr/X11R6/lib", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/opt/upspilot/lib/tls/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/opt/upspilot/lib/tls/i686", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/opt/upspilot/lib/tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/opt/upspilot/lib/tls", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/opt/upspilot/lib/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/opt/upspilot/lib/i686", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/opt/upspilot/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/opt/upspilot/lib", 0xbf9c6e80) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=85719, ...}) = 0 mmap2(NULL, 85719, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f9c000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\20P\1\000"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1202712, ...}) = 0 mmap2(NULL, 1146076, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7e84000 madvise(0xb7e84000, 1146076, MADV_SEQUENTIAL|0x1) = 0 mmap2(0xb7f96000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x111) = 0xb7f96000 mmap2(0xb7f9a000, 7388, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f9a000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e83000 mprotect(0xb7f96000, 4096, PROT_READ) = 0 mprotect(0xb7fc6000, 4096, PROT_READ) = 0 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e83b30, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 munmap(0xb7f9c000, 85719) = 0 open("/dev/urandom", O_RDONLY) = 3 read(3, "\215\240\0\321", 4) = 4 close(3) = 0 geteuid32() = 0 getuid32() = 0 uname({sys="Linux", node="voron.noname.com.ua", ...}) = 0 setrlimit(RLIMIT_CORE, {rlim_cur=0, rlim_max=0}) = 0 brk(0) = 0x8076da8 brk(0x8097da8) = 0x8097da8 brk(0x8098000) = 0x8098000 getcwd("/etc/grsec", 4095) = 11 mlock(0xbf9c7430, 256) = 0 ioctl(0, TIOCEXCL, 0) = 0 open("/dev/grsec", O_WRONLY) = 3 write(3, "0Q\234\277\31\2\0\0\34\1\0\0", 12) = 1 close(3) = 0 mlock(0xbf9c5110, 256) = 0 fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fb0000 write(1, "Password: ", 10Password: ) = 10 ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 opost isig icanon -echo ...}) = 0 read(0, "password\n", 128) = 9 write(1, "\n", 1 ) = 1 ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 opost isig icanon echo ...}) = 0 mlock(0x8076dc0, 284) = 0 open("/dev/grsec", O_WRONLY) = 3 write(3, "\300m\7\10\31\2\0\0\34\1\0\0", 12) = -1 EPERM (Operation not permitted) write(2, "Invalid password.\n", 18Invalid password. ) = 18 close(3) = 0 ioctl(0, TIOCNXCL, 0x12) = 0 munmap(0xb7fb0000, 4096) = 0 exit_group(1) = ? voron grsec #

Yes, the password is "password"

. In dmesg at that time

Code: Select all: [17204165.920000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:31639] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:21152] uid/euid:0/0 gid/egid:0/0 [17204165.920000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:31639] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:21152] uid/euid:0/0 gid/egid:0/0 [17204165.920000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:31639] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:21152] uid/euid:0/0 gid/egid:0/0 [17204165.924000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:31639] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:21152] uid/euid:0/0 gid/egid:0/0 [17204165.924000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:31639] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:21152] uid/euid:0/0 gid/egid:0/0 [17204165.924000] grsec: more alerts, logging disabled for 10 seconds

in gradm.log

Code: Select all: default 68 0 0 /usr/bin/strace / 1 1 /sbin/gradm 16 192.168.90.2 default 68 0 0 /usr/bin/strace / 1 1 /sbin/gradm 8 192.168.90.2

policy and learn_config is default from gradm.
When I tried reload

Code: Select all: voron grsec # gradm -R Password: Error changing directory to /etc/grsec Error: No such file or directory voron grsec #

, the same denied access to hidden file /usr appears in dmesg. It appears at each exec of gradm(after initial learn start) , even without any parametrs :-?

Intresting things with /sbin/grlearn

Code: Select all: voron grsec # which grlearn /sbin/grlearn voron grsec # /sbin/grlearn -su: /sbin/grlearn: No such file or directory voron grsec # dmesg|tail -n 6 [17210075.716000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[bash:27409] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:9992] uid/euid:0/0 gid/egid:0/0 [17210128.864000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[strace:29836] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:26585] uid/euid:0/0 gid/egid:0/0 [17210143.384000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[strace:23295] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:29821] uid/euid:0/0 gid/egid:0/0 [17210167.356000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[strace:4499] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/strace[strace:32739] uid/euid:0/0 gid/egid:0/0 [17210244.800000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[bash:31715] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:9992] uid/euid:0/0 gid/egid:0/0 [17210344.140000] grsec: From 192.168.90.2: (default:D:/sbin/grlearn) denied access to hidden file /lib/ld-2.3.6.so by /sbin/grlearn[bash:11521] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:9992] uid/euid:0/0 gid/egid:0/0

why files /usr and /lib/ld-2.3.6.so become hidden, when I'm only in learning mode?

on another server(amd64) with tha same kernel,patch,gradm and default policy and learn_config all ok

Code: Select all: [685550.142233] grsec: From 192.168.78.1: (default:D:/sbin/gradm) grsecurity 2.1.9 RBAC system loaded by /sbin/gradm[gradm:17125] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:5173] uid/euid:0/0 gid/egid:0/0 [703355.772703] grsec: From 192.168.78.1: shutdown auth success for /sbin/gradm[gradm:26095] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:23572] uid/euid:0/0 gid/egid:0/0

by **voron** » Mon May 29, 2006 11:18 am

Rebooted and tryed again. Deleted /etc/grsec/policy and changed password again.

Code: Select all: voron ~ # dmesg|tail -n 1 [17180015.600000] PPP Deflate Compression module registered voron ~ # gradm -S The RBAC system is currently disabled. voron ~ # dmesg|tail -n 1 [17180015.600000] PPP Deflate Compression module registered voron ~ # gradm -F -L /var/gradm.log voron ~ # dmesg|tail -n 1 [17180251.764000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) grsecurity 2.1.9 RBAC system loaded by /sbin/gradm[gradm:20624] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 voron ~ # gradm -S The RBAC system is currently enabled. voron ~ # dmesg|tail -n 6 [17180268.740000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:13600] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 [17180268.740000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:13600] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 [17180268.740000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:13600] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 [17180268.740000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:13600] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 [17180268.740000] grsec: From 192.168.90.2: (default:D:/sbin/gradm) denied access to hidden file /usr by /sbin/gradm[gradm:13600] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:30487] uid/euid:0/0 gid/egid:0/0 [17180268.740000] grsec: more alerts, logging disabled for 10 seconds voron ~ #

why in learn mode appears hidden files ? :roll:

grsecurity forums

Can't stop learning

Can't stop learning