selinux-policy/policy/modules/services/ssh.if

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## <summary>Secure shell client and server policy.</summary>
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#######################################
## <summary>
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## Basic SSH client template.
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## </summary>
## <desc>
## <p>
## This template creates a derived domains which are used
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## for ssh client sessions. A derived
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## type is also created to protect the user ssh keys.
## </p>
## <p>
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## This template was added for NX.
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## </p>
## </desc>
## <param name="userdomain_prefix">
## <summary>
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## The prefix of the domain (e.g., user
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## is the prefix for user_t).
## </summary>
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## </param>
## <param name="user_domain">
## <summary>
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## The type of the domain.
## </summary>
## </param>
## <param name="user_role">
## <summary>
## The role associated with the user domain.
## </summary>
## </param>
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#
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template(`ssh_basic_client_template',`
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gen_require(`
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attribute ssh_server;
type ssh_exec_t, sshd_key_t, sshd_tmp_t;
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')
##############################
#
# Declarations
#
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type $1_ssh_t;
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application_domain($1_ssh_t,ssh_exec_t)
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role $3 types $1_ssh_t;
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type $1_home_ssh_t;
files_type($1_home_ssh_t)
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##############################
#
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# Client local policy
#
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allow $1_ssh_t self:capability { setuid setgid dac_override dac_read_search };
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allow $1_ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
allow $1_ssh_t self:fd use;
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allow $1_ssh_t self:fifo_file rw_fifo_file_perms;
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allow $1_ssh_t self:unix_dgram_socket { create_socket_perms sendto };
allow $1_ssh_t self:unix_stream_socket { create_stream_socket_perms connectto };
allow $1_ssh_t self:shm create_shm_perms;
allow $1_ssh_t self:sem create_sem_perms;
allow $1_ssh_t self:msgq create_msgq_perms;
allow $1_ssh_t self:msg { send receive };
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allow $1_ssh_t self:tcp_socket create_socket_perms;
allow $1_ssh_t self:netlink_route_socket r_netlink_socket_perms;
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# for rsync
allow $1_ssh_t $2:unix_stream_socket rw_socket_perms;
allow $1_ssh_t $2:unix_stream_socket connectto;
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# Read the ssh key file.
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allow $1_ssh_t sshd_key_t:file read_file_perms;
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# Access the ssh temporary files.
allow $1_ssh_t sshd_tmp_t:dir manage_dir_perms;
allow $1_ssh_t sshd_tmp_t:file manage_file_perms;
files_tmp_filetrans($1_ssh_t, sshd_tmp_t, { file dir })
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# Transition from the domain to the derived domain.
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domtrans_pattern($2, ssh_exec_t, $1_ssh_t)
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# inheriting stream sockets is needed for "ssh host command" as no pty
# is allocated
# cjp: should probably fix target to be an attribute for ssh servers
# or "regular" (not special like sshd_extern_t) servers
allow $2 ssh_server:unix_stream_socket rw_stream_socket_perms;
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# allow ps to show ssh
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ps_process_pattern($2,$1_ssh_t)
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# user can manage the keys and config
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manage_files_pattern($2,$1_home_ssh_t,$1_home_ssh_t)
manage_lnk_files_pattern($2,$1_home_ssh_t,$1_home_ssh_t)
manage_sock_files_pattern($2,$1_home_ssh_t,$1_home_ssh_t)
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# ssh client can manage the keys and config
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manage_files_pattern($1_ssh_t,$1_home_ssh_t,$1_home_ssh_t)
read_lnk_files_pattern($1_ssh_t,$1_home_ssh_t,$1_home_ssh_t)
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# ssh servers can read the user keys and config
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allow ssh_server $1_home_ssh_t:dir list_dir_perms;
read_files_pattern(ssh_server,$1_home_ssh_t,$1_home_ssh_t)
read_lnk_files_pattern(ssh_server,$1_home_ssh_t,$1_home_ssh_t)
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kernel_read_kernel_sysctls($1_ssh_t)
corenet_all_recvfrom_unlabeled($1_ssh_t)
corenet_all_recvfrom_netlabel($1_ssh_t)
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corenet_tcp_sendrecv_all_if($1_ssh_t)
corenet_tcp_sendrecv_all_nodes($1_ssh_t)
corenet_tcp_sendrecv_all_ports($1_ssh_t)
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corenet_tcp_connect_ssh_port($1_ssh_t)
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corenet_sendrecv_ssh_client_packets($1_ssh_t)
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dev_read_urand($1_ssh_t)
fs_getattr_all_fs($1_ssh_t)
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fs_search_auto_mountpoints($1_ssh_t)
# run helper programs - needed eg for x11-ssh-askpass
corecmd_exec_shell($1_ssh_t)
corecmd_exec_bin($1_ssh_t)
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domain_use_interactive_fds($1_ssh_t)
files_list_home($1_ssh_t)
files_read_usr_files($1_ssh_t)
files_read_etc_runtime_files($1_ssh_t)
files_read_etc_files($1_ssh_t)
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files_read_var_files($1_ssh_t)
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libs_use_ld_so($1_ssh_t)
libs_use_shared_libs($1_ssh_t)
logging_send_syslog_msg($1_ssh_t)
logging_read_generic_logs($1_ssh_t)
miscfiles_read_localization($1_ssh_t)
seutil_read_config($1_ssh_t)
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sysnet_read_config($1_ssh_t)
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sysnet_dns_name_resolve($1_ssh_t)
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tunable_policy(`read_default_t',`
files_list_default($1_ssh_t)
files_read_default_files($1_ssh_t)
files_read_default_symlinks($1_ssh_t)
files_read_default_sockets($1_ssh_t)
files_read_default_pipes($1_ssh_t)
')
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optional_policy(`
kerberos_use($1_ssh_t)
')
optional_policy(`
nis_use_ypbind($1_ssh_t)
')
optional_policy(`
nscd_socket_use($1_ssh_t)
')
')
#######################################
## <summary>
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## The per role template for the ssh module.
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## </summary>
## <desc>
## <p>
## This template creates a derived domains which are used
## for ssh client sessions and user ssh agents. A derived
## type is also created to protect the user ssh keys.
## </p>
## <p>
## This template is invoked automatically for each user, and
## generally does not need to be invoked directly
## by policy writers.
## </p>
## </desc>
## <param name="userdomain_prefix">
## <summary>
## The prefix of the user domain (e.g., user
## is the prefix for user_t).
## </summary>
## </param>
## <param name="user_domain">
## <summary>
## The type of the user domain.
## </summary>
## </param>
## <param name="user_role">
## <summary>
## The role associated with the user domain.
## </summary>
## </param>
#
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template(`ssh_per_role_template',`
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gen_require(`
type ssh_agent_exec_t, ssh_keysign_exec_t;
')
##############################
#
# Declarations
#
ssh_basic_client_template($1,$2,$3)
userdom_user_home_content($1,$1_home_ssh_t)
type $1_ssh_agent_t;
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application_domain($1_ssh_agent_t,ssh_agent_exec_t)
domain_interactive_fd($1_ssh_agent_t)
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role $3 types $1_ssh_agent_t;
type $1_ssh_agent_tmp_t;
files_tmp_file($1_ssh_agent_tmp_t)
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type $1_ssh_keysign_t;
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application_domain($1_ssh_keysign_t,ssh_keysign_exec_t)
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role $3 types $1_ssh_keysign_t;
type $1_ssh_tmpfs_t;
files_tmpfs_file($1_ssh_tmpfs_t)
##############################
#
# Client local policy
#
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manage_files_pattern($1_ssh_t,$1_ssh_tmpfs_t,$1_ssh_tmpfs_t)
manage_lnk_files_pattern($1_ssh_t,$1_ssh_tmpfs_t,$1_ssh_tmpfs_t)
manage_fifo_files_pattern($1_ssh_t,$1_ssh_tmpfs_t,$1_ssh_tmpfs_t)
manage_sock_files_pattern($1_ssh_t,$1_ssh_tmpfs_t,$1_ssh_tmpfs_t)
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fs_tmpfs_filetrans($1_ssh_t,$1_ssh_tmpfs_t,{ dir file lnk_file sock_file fifo_file })
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manage_dirs_pattern($1_ssh_t,$1_home_ssh_t,$1_home_ssh_t)
manage_sock_files_pattern($1_ssh_t,$1_home_ssh_t,$1_home_ssh_t)
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userdom_user_home_dir_filetrans($1,$1_ssh_t,$1_home_ssh_t,{ dir sock_file })
# Allow the ssh program to communicate with ssh-agent.
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stream_connect_pattern($1_ssh_t,$1_ssh_agent_tmp_t,$1_ssh_agent_tmp_t,$1_ssh_agent_t)
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allow $1_ssh_t sshd_t:unix_stream_socket connectto;
allow $2 $1_ssh_t:process signal;
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userdom_use_unpriv_users_fds($1_ssh_t)
userdom_dontaudit_list_user_home_dirs($1,$1_ssh_t)
userdom_search_user_home_dirs($1,$1_ssh_t)
# Write to the user domain tty.
userdom_use_user_terminals($1,$1_ssh_t)
# needs to read krb tgt
userdom_read_user_tmp_files($1, $1_ssh_t)
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tunable_policy(`allow_ssh_keysign',`
domain_auto_trans($1_ssh_t, ssh_keysign_exec_t, $1_ssh_keysign_t)
allow $1_ssh_keysign_t $1_ssh_t:fd use;
allow $1_ssh_keysign_t $1_ssh_t:process sigchld;
allow $1_ssh_keysign_t $1_ssh_t:fifo_file rw_file_perms;
')
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tunable_policy(`use_nfs_home_dirs',`
fs_manage_nfs_dirs($1_ssh_t)
fs_manage_nfs_files($1_ssh_t)
')
tunable_policy(`use_samba_home_dirs',`
fs_manage_cifs_dirs($1_ssh_t)
fs_manage_cifs_files($1_ssh_t)
')
# for port forwarding
tunable_policy(`user_tcp_server',`
corenet_tcp_bind_ssh_port($1_ssh_t)
')
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optional_policy(`
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xserver_user_x_domain_template($1,$1_ssh,$1_ssh_t,$1_ssh_tmpfs_t)
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xserver_domtrans_user_xauth($1,$1_ssh_t)
')
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ifdef(`TODO',`
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# for /bin/sh used to execute xauth
dontaudit $1_ssh_t proc_t:{ lnk_file file } { getattr read };
#allow ssh to access keys stored on removable media
# Should we have a boolean around this?
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files_search_mnt($1_ssh_t)
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r_dir_file($1_ssh_t, removable_t)
') dnl endif TODO
##############################
#
# $1_ssh_agent_t local policy
#
allow $1_ssh_agent_t self:process setrlimit;
allow $1_ssh_agent_t self:capability setgid;
allow $1_ssh_agent_t { $1_ssh_agent_t $2 }:process signull;
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allow $1_ssh_agent_t self:unix_stream_socket { create_stream_socket_perms connectto };
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manage_dirs_pattern($1_ssh_agent_t,$1_ssh_agent_tmp_t,$1_ssh_agent_tmp_t)
manage_sock_files_pattern($1_ssh_agent_t,$1_ssh_agent_tmp_t,$1_ssh_agent_tmp_t)
files_tmp_filetrans($1_ssh_agent_t,$1_ssh_agent_tmp_t,{ dir sock_file })
# for ssh-add
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stream_connect_pattern($2,$1_ssh_agent_tmp_t,$1_ssh_agent_tmp_t,$1_ssh_agent_t)
# Allow the user shell to signal the ssh program.
allow $2 $1_ssh_agent_t:process signal;
# allow ps to show ssh
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ps_process_pattern($2,$1_ssh_agent_t)
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domtrans_pattern($2, ssh_agent_exec_t, $1_ssh_agent_t)
kernel_read_kernel_sysctls($1_ssh_agent_t)
dev_read_urand($1_ssh_agent_t)
dev_read_rand($1_ssh_agent_t)
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fs_search_auto_mountpoints($1_ssh_agent_t)
# transition back to normal privs upon exec
corecmd_shell_domtrans($1_ssh_agent_t,$1_t)
corecmd_bin_domtrans($1_ssh_agent_t, $1_t)
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domain_use_interactive_fds($1_ssh_agent_t)
files_read_etc_files($1_ssh_agent_t)
files_read_etc_runtime_files($1_ssh_agent_t)
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files_search_home($1_ssh_agent_t)
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libs_read_lib_files($1_ssh_agent_t)
libs_use_ld_so($1_ssh_agent_t)
libs_use_shared_libs($1_ssh_agent_t)
logging_send_syslog_msg($1_ssh_agent_t)
miscfiles_read_localization($1_ssh_agent_t)
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seutil_dontaudit_read_config($1_ssh_agent_t)
# Write to the user domain tty.
userdom_use_user_terminals($1,$1_ssh_agent_t)
# for the transition back to normal privs upon exec
userdom_user_home_domtrans($1,$1_ssh_agent_t,$2)
allow $2 $1_ssh_agent_t:fd use;
allow $2 $1_ssh_agent_t:fifo_file rw_file_perms;
allow $2 $1_ssh_agent_t:process sigchld;
tunable_policy(`use_nfs_home_dirs',`
fs_manage_nfs_files($1_ssh_agent_t)
# transition back to normal privs upon exec
fs_nfs_domtrans($1_ssh_agent_t, $1_t)
')
tunable_policy(`use_samba_home_dirs',`
fs_manage_cifs_files($1_ssh_agent_t)
# transition back to normal privs upon exec
fs_cifs_domtrans($1_ssh_agent_t, $1_t)
')
optional_policy(`
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nis_use_ypbind($1_ssh_agent_t)
')
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optional_policy(`
xserver_use_xdm_fds($1_ssh_agent_t)
xserver_rw_xdm_pipes($1_ssh_agent_t)
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')
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ifdef(`TODO',`
dontaudit $1_ssh_agent_t proc_t:{ lnk_file file } { getattr read };
') dnl endif TODO
##############################
#
# $1_ssh_keysign_t local policy
#
tunable_policy(`allow_ssh_keysign',`
allow $1_ssh_keysign_t self:capability { setgid setuid };
allow $1_ssh_keysign_t self:unix_stream_socket create_socket_perms;
allow $1_ssh_keysign_t sshd_key_t:file { getattr read };
dev_read_urand($1_ssh_keysign_t)
files_read_etc_files($1_ssh_keysign_t)
libs_use_ld_so($1_ssh_keysign_t)
libs_use_shared_libs($1_ssh_keysign_t)
')
optional_policy(`
tunable_policy(`allow_ssh_keysign',`
nscd_socket_use($1_ssh_keysign_t)
')
')
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')
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#######################################
## <summary>
## The template to define a ssh server.
## </summary>
## <desc>
## <p>
## This template creates a domains to be used for
## creating a ssh server. This is typically done
## to have multiple ssh servers of different sensitivities,
## such as for an internal network-facing ssh server, and
## a external network-facing ssh server.
## </p>
## </desc>
## <param name="userdomain_prefix">
## <summary>
## The prefix of the server domain (e.g., sshd
## is the prefix for sshd_t).
## </summary>
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## </param>
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#
template(`ssh_server_template', `
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type $1_t, ssh_server;
auth_login_pgm_domain($1_t)
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type $1_devpts_t;
term_login_pty($1_devpts_t)
type $1_var_run_t;
files_pid_file($1_var_run_t)
allow $1_t self:capability { kill sys_chroot sys_resource chown dac_override fowner fsetid setgid setuid sys_tty_config };
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allow $1_t self:fifo_file rw_fifo_file_perms;
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allow $1_t self:process { signal setsched setrlimit setexec };
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allow $1_t self:tcp_socket create_stream_socket_perms;
allow $1_t self:udp_socket create_socket_perms;
# ssh agent connections:
allow $1_t self:unix_stream_socket create_stream_socket_perms;
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allow $1_t $1_devpts_t:chr_file { rw_chr_file_perms setattr getattr relabelfrom };
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term_create_pty($1_t,$1_devpts_t)
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allow $1_t $1_var_run_t:file manage_file_perms;
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files_pid_filetrans($1_t,$1_var_run_t,file)
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can_exec($1_t, sshd_exec_t)
# Access key files
allow $1_t sshd_key_t:file { getattr read };
kernel_read_kernel_sysctls($1_t)
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corenet_all_recvfrom_unlabeled($1_t)
corenet_all_recvfrom_netlabel($1_t)
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corenet_tcp_sendrecv_all_if($1_t)
corenet_udp_sendrecv_all_if($1_t)
corenet_raw_sendrecv_all_if($1_t)
corenet_tcp_sendrecv_all_nodes($1_t)
corenet_udp_sendrecv_all_nodes($1_t)
corenet_raw_sendrecv_all_nodes($1_t)
corenet_udp_sendrecv_all_ports($1_t)
corenet_tcp_sendrecv_all_ports($1_t)
corenet_tcp_bind_all_nodes($1_t)
corenet_udp_bind_all_nodes($1_t)
corenet_tcp_bind_ssh_port($1_t)
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corenet_tcp_connect_all_ports($1_t)
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corenet_sendrecv_ssh_server_packets($1_t)
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fs_dontaudit_getattr_all_fs($1_t)
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auth_rw_login_records($1_t)
auth_rw_faillog($1_t)
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corecmd_read_bin_symlinks($1_t)
corecmd_getattr_bin_files($1_t)
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# for sshd subsystems, such as sftp-server.
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corecmd_getattr_bin_files($1_t)
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domain_interactive_fd($1_t)
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files_read_etc_files($1_t)
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files_read_etc_runtime_files($1_t)
libs_use_ld_so($1_t)
libs_use_shared_libs($1_t)
logging_search_logs($1_t)
miscfiles_read_localization($1_t)
sysnet_read_config($1_t)
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userdom_dontaudit_relabelfrom_unpriv_users_ptys($1_t)
userdom_search_all_users_home_dirs($1_t)
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tunable_policy(`use_nfs_home_dirs',`
fs_read_nfs_files($1_t)
')
tunable_policy(`use_samba_home_dirs',`
fs_read_cifs_files($1_t)
')
optional_policy(`
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kerberos_use($1_t)
')
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optional_policy(`
# Allow checking users mail at login
mta_getattr_spool($1_t)
')
optional_policy(`
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nscd_socket_use($1_t)
')
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optional_policy(`
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nx_spec_domtrans_server($1_t)
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')
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')
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########################################
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## <summary>
## Send a SIGCHLD signal to the ssh server.
## </summary>
## <param name="domain">
## <summary>
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## Domain allowed access.
## </summary>
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## </param>
#
interface(`ssh_sigchld',`
gen_require(`
type sshd_t;
')
allow $1 sshd_t:process sigchld;
')
########################################
## <summary>
## Read a ssh server unnamed pipe.
## </summary>
## <param name="domain">
## <summary>
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## Domain allowed access.
## </summary>
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## </param>
#
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interface(`ssh_read_pipes',`
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gen_require(`
type sshd_t;
')
allow $1 sshd_t:fifo_file { getattr read };
')
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########################################
## <summary>
## Read and write ssh server unix domain stream sockets.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_rw_stream_sockets',`
gen_require(`
type sshd_t;
')
allow $1 sshd_t:unix_stream_socket rw_stream_socket_perms;
')
########################################
## <summary>
## Read and write ssh server TCP sockets.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_rw_tcp_sockets',`
gen_require(`
type sshd_t;
')
allow $1 sshd_t:tcp_socket rw_stream_socket_perms;
')
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########################################
## <summary>
## Do not audit attempts to read and write
## ssh server TCP sockets.
## </summary>
## <param name="domain">
## <summary>
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## Domain to not audit.
## </summary>
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## </param>
#
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interface(`ssh_dontaudit_rw_tcp_sockets',`
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gen_require(`
type sshd_t;
')
dontaudit $1 sshd_t:tcp_socket { read write };
')
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########################################
## <summary>
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## Connect to SSH daemons over TCP sockets. (Deprecated)
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## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_tcp_connect',`
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refpolicywarn(`$0($*) has been deprecated.')
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')
########################################
## <summary>
## Execute the ssh daemon sshd domain.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_domtrans',`
gen_require(`
type sshd_t, sshd_exec_t;
')
domtrans_pattern($1,sshd_exec_t,sshd_t)
')
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########################################
## <summary>
## Execute the ssh client in the caller domain.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_exec',`
gen_require(`
type ssh_exec_t;
')
corecmd_search_bin($1)
can_exec($1,ssh_exec_t)
')
########################################
## <summary>
## Execute the ssh key generator in the ssh keygen domain.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`ssh_domtrans_keygen',`
gen_require(`
type ssh_keygen_t, ssh_keygen_exec_t;
')
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domtrans_pattern($1,ssh_keygen_exec_t,ssh_keygen_t)
')
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########################################
## <summary>
## Read ssh server keys
## </summary>
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## <param name="domain">
## <summary>
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## Domain allowed access.
## </summary>
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## </param>
#
interface(`ssh_dontaudit_read_server_keys',`
gen_require(`
type sshd_key_t;
')
dontaudit $1 sshd_key_t:file { getattr read };
')