selinux-refpolicy/policy/modules/admin/sudo.if

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## <summary>Execute a command with a substitute user</summary>
#######################################
## <summary>
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## The role template for the sudo module.
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## </summary>
## <desc>
## <p>
## This template creates a derived domain which is allowed
## to change the linux user id, to run commands as a different
## user.
## </p>
## </desc>
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## <param name="role_prefix">
## <summary>
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## The prefix of the user role (e.g., user
## is the prefix for user_r).
## </summary>
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## </param>
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## <param name="user_role">
## <summary>
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## The user role.
## </summary>
## </param>
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## <param name="user_domain">
## <summary>
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## The user domain associated with the role.
## </summary>
## </param>
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#
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template(`sudo_role_template',`
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gen_require(`
type sudo_exec_t;
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attribute sudodomain;
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')
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##############################
#
# Declarations
#
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type $1_sudo_t, sudodomain;
userdom_user_application_domain($1_sudo_t, sudo_exec_t)
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domain_interactive_fd($1_sudo_t)
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domain_role_change_exemption($1_sudo_t)
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role $2 types $1_sudo_t;
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##############################
#
# Local Policy
#
# Use capabilities.
allow $1_sudo_t self:capability { chown dac_override fowner kill setgid setuid sys_nice sys_resource };
allow $1_sudo_t self:process { signal_perms getsched setsched getsession getpgid setpgid getcap setcap share getattr getrlimit rlimitinh siginh transition setsockcreate dyntransition noatsecure setkeycreate };
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allow $1_sudo_t self:process { setexec setrlimit };
allow $1_sudo_t self:fd use;
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allow $1_sudo_t self:fifo_file rw_fifo_file_perms;
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allow $1_sudo_t self:shm create_shm_perms;
allow $1_sudo_t self:sem create_sem_perms;
allow $1_sudo_t self:msgq create_msgq_perms;
allow $1_sudo_t self:msg { send receive };
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allow $1_sudo_t self:unix_dgram_socket create_socket_perms;
allow $1_sudo_t self:unix_stream_socket create_stream_socket_perms;
allow $1_sudo_t self:unix_dgram_socket sendto;
allow $1_sudo_t self:unix_stream_socket connectto;
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allow $1_sudo_t self:key manage_key_perms;
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allow $1_sudo_t $3:key search;
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sudo: allow transmitting SIGWINCH to its child When resizing the X11 window of a terminal running sudo on a remote Debian 10 system (through ssh), sudo forwards SIGWINCH to its children (this behavior might be caused by using "Defaults use_pty" in /etc/sudoers). This leads to the following audit logs: type=AVC msg=audit(1567880108.988:13823): avc: denied { signal } for pid=15670 comm="sudo" scontext=sysadm_u:sysadm_r:sysadm_sudo_t tcontext=sysadm_u:sysadm_r:sysadm_t tclass=process permissive=0 type=SYSCALL msg=audit(1567880108.988:13823): arch=c000003e syscall=62 success=no exit=-13 a0=ffffc2c9 a1=1c a2=ffffffff a3=100 items=0 ppid=15607 pid=15670 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts6 ses=721 comm="sudo" exe="/usr/bin/sudo" subj=sysadm_u:sysadm_r:sysadm_sudo_t key=(null) type=PROCTITLE msg=audit(1567880108.988:13823): proctitle=2F7573722F62696E2F7375646F002D73 The process tree (ps -ef, edited) on this remote system was: LABEL UID PID PPID TTY CMD system_u:system_r:sshd_t user 15519 15480 ? sshd: user@pts/5 sysadm_u:sysadm_r:sysadm_t user 15524 15519 pts/5 -zsh sysadm_u:sysadm_r:sysadm_sudo_t root 15607 15524 pts/5 /usr/bin/sudo -s sysadm_u:sysadm_r:sysadm_sudo_t root 15670 15607 pts/6 /usr/bin/sudo -s sysadm_u:sysadm_r:sysadm_t root 15671 15670 pts/6 /usr/bin/zsh The denied syscall was: * syscall=62: int kill(pid_t pid, int sig) * a0=ffffc2c9: pid = -15671 (process group of sudo's child) * a1=1c: sig = 28 = SIGWINCH Allow such a signal to be transmitted. Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
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# Transmit SIGWINCH to children
allow $1_sudo_t $3:process signal;
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# Enter this derived domain from the user domain
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domtrans_pattern($3, sudo_exec_t, $1_sudo_t)
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# By default, revert to the calling domain when a shell is executed.
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corecmd_shell_domtrans($1_sudo_t, $3)
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corecmd_bin_domtrans($1_sudo_t, $3)
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allow $3 $1_sudo_t:fd use;
allow $3 $1_sudo_t:fifo_file rw_fifo_file_perms;
allow $3 $1_sudo_t:process signal_perms;
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kernel_read_kernel_sysctls($1_sudo_t)
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kernel_read_system_state($1_sudo_t)
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kernel_link_key($1_sudo_t)
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corecmd_exec_all_executables($1_sudo_t)
dev_getattr_fs($1_sudo_t)
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dev_read_urand($1_sudo_t)
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dev_rw_generic_usb_dev($1_sudo_t)
dev_read_sysfs($1_sudo_t)
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domain_use_interactive_fds($1_sudo_t)
domain_sigchld_interactive_fds($1_sudo_t)
domain_getattr_all_entry_files($1_sudo_t)
files_read_etc_files($1_sudo_t)
files_read_var_files($1_sudo_t)
files_read_usr_symlinks($1_sudo_t)
files_getattr_usr_files($1_sudo_t)
# for some PAM modules and for cwd
files_dontaudit_search_home($1_sudo_t)
files_list_tmp($1_sudo_t)
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fs_search_auto_mountpoints($1_sudo_t)
fs_getattr_xattr_fs($1_sudo_t)
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selinux_validate_context($1_sudo_t)
selinux_compute_relabel_context($1_sudo_t)
term_getattr_pty_fs($1_sudo_t)
term_dontaudit_getattr_unallocated_ttys($1_sudo_t)
term_relabel_all_ttys($1_sudo_t)
term_relabel_all_ptys($1_sudo_t)
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auth_run_chk_passwd($1_sudo_t, $2)
# sudo stores a token in the pam runtime directory
auth_manage_pam_runtime_dirs($1_sudo_t)
auth_manage_pam_runtime_files($1_sudo_t)
pam_faillock creates files in /run/faillock These are changes needed when pam_fallock creates files in /run/faillock (which is labeled faillog_t). sudo and xdm (and probably other domains) will create files in this directory for successful and failed login attempts. v3 - Updated based on feedback type=AVC msg=audit(1545153126.899:210): avc: denied { search } for pid=8448 comm="lightdm" name="faillock" dev="tmpfs" ino=39318 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545153131.090:214): avc: denied { write } for pid=8448 comm="lightdm" name="faillock" dev="tmpfs" ino=39318 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545153131.090:214): avc: denied { add_name } for pid=8448 comm="lightdm" name="dsugar" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545153131.090:214): avc: denied { create } for pid=8448 comm="lightdm" name="dsugar" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=file permissive=1 type=AVC msg=audit(1545153131.091:215): avc: denied { setattr } for pid=8448 comm="lightdm" name="dsugar" dev="tmpfs" ino=87599 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=file permissive=1 type=AVC msg=audit(1545167205.531:626): avc: denied { search } for pid=8264 comm="sudo" name="faillock" dev="tmpfs" ino=35405 scontext=sysadm_u:sysadm_r:cleaner_applyconfig_sudo_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545167205.531:627): avc: denied { write } for pid=8264 comm="sudo" name="faillock" dev="tmpfs" ino=35405 scontext=sysadm_u:sysadm_r:cleaner_applyconfig_sudo_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545167205.531:627): avc: denied { add_name } for pid=8264 comm="sudo" name="root" scontext=sysadm_u:sysadm_r:cleaner_applyconfig_sudo_t:s0-s0:c0.c1023 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=1 type=AVC msg=audit(1545167205.531:627): avc: denied { create } for pid=8264 comm="sudo" name="root" scontext=sysadm_u:sysadm_r:cleaner_applyconfig_sudo_t:s0-s0:c0.c1023 tcontext=sysadm_u:object_r:faillog_t:s0 tclass=file permissive=1 Signed-off-by: Dave Sugar <dsugar@tresys.com>
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auth_use_pam($1_sudo_t)
auth_runtime_filetrans_pam_runtime($1_sudo_t, dir, "sudo")
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init_rw_utmp($1_sudo_t)
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logging_send_audit_msgs($1_sudo_t)
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logging_send_syslog_msg($1_sudo_t)
miscfiles_read_localization($1_sudo_t)
seutil_read_default_contexts($1_sudo_t)
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seutil_libselinux_linked($1_sudo_t)
userdom_spec_domtrans_all_users($1_sudo_t)
userdom_create_all_users_keys($1_sudo_t)
userdom_create_user_pty($1_sudo_t)
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userdom_manage_user_home_content_files($1_sudo_t)
userdom_manage_user_home_content_symlinks($1_sudo_t)
userdom_manage_user_tmp_files($1_sudo_t)
userdom_manage_user_tmp_symlinks($1_sudo_t)
userdom_setattr_user_ptys($1_sudo_t)
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userdom_use_user_terminals($1_sudo_t)
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# for some PAM modules and for cwd
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userdom_dontaudit_search_user_home_content($1_sudo_t)
userdom_dontaudit_search_user_home_dirs($1_sudo_t)
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ifdef(`hide_broken_symptoms', `
dontaudit $1_sudo_t $3:socket_class_set { read write };
')
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tunable_policy(`use_nfs_home_dirs',`
fs_manage_nfs_files($1_sudo_t)
')
tunable_policy(`use_samba_home_dirs',`
fs_manage_cifs_files($1_sudo_t)
')
optional_policy(`
dbus_system_bus_client($1_sudo_t)
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ifdef(`init_systemd',`
init_dbus_chat($1_sudo_t)
')
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')
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optional_policy(`
fprintd_dbus_chat($1_sudo_t)
')
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')
########################################
## <summary>
## Send a SIGCHLD signal to the sudo domain.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`sudo_sigchld',`
gen_require(`
attribute sudodomain;
')
allow $1 sudodomain:process sigchld;
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')